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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / fs / xfs / xfs_bmap.c
blob2def273855a2ebe3c5ae127a8ff20f2ea901aa7c
1 /*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_inum.h"
24 #include "xfs_trans.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_dir2.h"
28 #include "xfs_da_btree.h"
29 #include "xfs_bmap_btree.h"
30 #include "xfs_alloc_btree.h"
31 #include "xfs_ialloc_btree.h"
32 #include "xfs_dir2_sf.h"
33 #include "xfs_attr_sf.h"
34 #include "xfs_dinode.h"
35 #include "xfs_inode.h"
36 #include "xfs_btree.h"
37 #include "xfs_dmapi.h"
38 #include "xfs_mount.h"
39 #include "xfs_ialloc.h"
40 #include "xfs_itable.h"
41 #include "xfs_dir2_data.h"
42 #include "xfs_dir2_leaf.h"
43 #include "xfs_dir2_block.h"
44 #include "xfs_inode_item.h"
45 #include "xfs_extfree_item.h"
46 #include "xfs_alloc.h"
47 #include "xfs_bmap.h"
48 #include "xfs_rtalloc.h"
49 #include "xfs_error.h"
50 #include "xfs_attr_leaf.h"
51 #include "xfs_rw.h"
52 #include "xfs_quota.h"
53 #include "xfs_trans_space.h"
54 #include "xfs_buf_item.h"
55 #include "xfs_filestream.h"
56 #include "xfs_vnodeops.h"
57
58
59 #ifdef DEBUG
60 STATIC void
61 xfs_bmap_check_leaf_extents(xfs_btree_cur_t *cur, xfs_inode_t *ip, int whichfork);
62 #endif
63
64 kmem_zone_t *xfs_bmap_free_item_zone;
65
66 /*
67 * Prototypes for internal bmap routines.
68 */
69
70
71 /*
72 * Called from xfs_bmap_add_attrfork to handle extents format files.
73 */
74 STATIC int /* error */
75 xfs_bmap_add_attrfork_extents(
76 xfs_trans_t *tp, /* transaction pointer */
77 xfs_inode_t *ip, /* incore inode pointer */
78 xfs_fsblock_t *firstblock, /* first block allocated */
79 xfs_bmap_free_t *flist, /* blocks to free at commit */
80 int *flags); /* inode logging flags */
81
82 /*
83 * Called from xfs_bmap_add_attrfork to handle local format files.
84 */
85 STATIC int /* error */
86 xfs_bmap_add_attrfork_local(
87 xfs_trans_t *tp, /* transaction pointer */
88 xfs_inode_t *ip, /* incore inode pointer */
89 xfs_fsblock_t *firstblock, /* first block allocated */
90 xfs_bmap_free_t *flist, /* blocks to free at commit */
91 int *flags); /* inode logging flags */
92
93 /*
94 * Called by xfs_bmapi to update file extent records and the btree
95 * after allocating space (or doing a delayed allocation).
96 */
97 STATIC int /* error */
98 xfs_bmap_add_extent(
99 xfs_inode_t *ip, /* incore inode pointer */
100 xfs_extnum_t idx, /* extent number to update/insert */
101 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
102 xfs_bmbt_irec_t *new, /* new data to add to file extents */
103 xfs_fsblock_t *first, /* pointer to firstblock variable */
104 xfs_bmap_free_t *flist, /* list of extents to be freed */
105 int *logflagsp, /* inode logging flags */
106 xfs_extdelta_t *delta, /* Change made to incore extents */
107 int whichfork, /* data or attr fork */
108 int rsvd); /* OK to allocate reserved blocks */
109
110 /*
111 * Called by xfs_bmap_add_extent to handle cases converting a delayed
112 * allocation to a real allocation.
113 */
114 STATIC int /* error */
115 xfs_bmap_add_extent_delay_real(
116 xfs_inode_t *ip, /* incore inode pointer */
117 xfs_extnum_t idx, /* extent number to update/insert */
118 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
119 xfs_bmbt_irec_t *new, /* new data to add to file extents */
120 xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
121 xfs_fsblock_t *first, /* pointer to firstblock variable */
122 xfs_bmap_free_t *flist, /* list of extents to be freed */
123 int *logflagsp, /* inode logging flags */
124 xfs_extdelta_t *delta, /* Change made to incore extents */
125 int rsvd); /* OK to allocate reserved blocks */
126
127 /*
128 * Called by xfs_bmap_add_extent to handle cases converting a hole
129 * to a delayed allocation.
130 */
131 STATIC int /* error */
132 xfs_bmap_add_extent_hole_delay(
133 xfs_inode_t *ip, /* incore inode pointer */
134 xfs_extnum_t idx, /* extent number to update/insert */
135 xfs_bmbt_irec_t *new, /* new data to add to file extents */
136 int *logflagsp,/* inode logging flags */
137 xfs_extdelta_t *delta, /* Change made to incore extents */
138 int rsvd); /* OK to allocate reserved blocks */
139
140 /*
141 * Called by xfs_bmap_add_extent to handle cases converting a hole
142 * to a real allocation.
143 */
144 STATIC int /* error */
145 xfs_bmap_add_extent_hole_real(
146 xfs_inode_t *ip, /* incore inode pointer */
147 xfs_extnum_t idx, /* extent number to update/insert */
148 xfs_btree_cur_t *cur, /* if null, not a btree */
149 xfs_bmbt_irec_t *new, /* new data to add to file extents */
150 int *logflagsp, /* inode logging flags */
151 xfs_extdelta_t *delta, /* Change made to incore extents */
152 int whichfork); /* data or attr fork */
153
154 /*
155 * Called by xfs_bmap_add_extent to handle cases converting an unwritten
156 * allocation to a real allocation or vice versa.
157 */
158 STATIC int /* error */
159 xfs_bmap_add_extent_unwritten_real(
160 xfs_inode_t *ip, /* incore inode pointer */
161 xfs_extnum_t idx, /* extent number to update/insert */
162 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
163 xfs_bmbt_irec_t *new, /* new data to add to file extents */
164 int *logflagsp, /* inode logging flags */
165 xfs_extdelta_t *delta); /* Change made to incore extents */
166
167 /*
168 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
169 * It figures out where to ask the underlying allocator to put the new extent.
170 */
171 STATIC int /* error */
172 xfs_bmap_alloc(
173 xfs_bmalloca_t *ap); /* bmap alloc argument struct */
174
175 /*
176 * Transform a btree format file with only one leaf node, where the
177 * extents list will fit in the inode, into an extents format file.
178 * Since the file extents are already in-core, all we have to do is
179 * give up the space for the btree root and pitch the leaf block.
180 */
181 STATIC int /* error */
182 xfs_bmap_btree_to_extents(
183 xfs_trans_t *tp, /* transaction pointer */
184 xfs_inode_t *ip, /* incore inode pointer */
185 xfs_btree_cur_t *cur, /* btree cursor */
186 int *logflagsp, /* inode logging flags */
187 int whichfork); /* data or attr fork */
188
189 /*
190 * Called by xfs_bmapi to update file extent records and the btree
191 * after removing space (or undoing a delayed allocation).
192 */
193 STATIC int /* error */
194 xfs_bmap_del_extent(
195 xfs_inode_t *ip, /* incore inode pointer */
196 xfs_trans_t *tp, /* current trans pointer */
197 xfs_extnum_t idx, /* extent number to update/insert */
198 xfs_bmap_free_t *flist, /* list of extents to be freed */
199 xfs_btree_cur_t *cur, /* if null, not a btree */
200 xfs_bmbt_irec_t *new, /* new data to add to file extents */
201 int *logflagsp,/* inode logging flags */
202 xfs_extdelta_t *delta, /* Change made to incore extents */
203 int whichfork, /* data or attr fork */
204 int rsvd); /* OK to allocate reserved blocks */
205
206 /*
207 * Remove the entry "free" from the free item list. Prev points to the
208 * previous entry, unless "free" is the head of the list.
209 */
210 STATIC void
211 xfs_bmap_del_free(
212 xfs_bmap_free_t *flist, /* free item list header */
213 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
214 xfs_bmap_free_item_t *free); /* list item to be freed */
215
216 /*
217 * Convert an extents-format file into a btree-format file.
218 * The new file will have a root block (in the inode) and a single child block.
219 */
220 STATIC int /* error */
221 xfs_bmap_extents_to_btree(
222 xfs_trans_t *tp, /* transaction pointer */
223 xfs_inode_t *ip, /* incore inode pointer */
224 xfs_fsblock_t *firstblock, /* first-block-allocated */
225 xfs_bmap_free_t *flist, /* blocks freed in xaction */
226 xfs_btree_cur_t **curp, /* cursor returned to caller */
227 int wasdel, /* converting a delayed alloc */
228 int *logflagsp, /* inode logging flags */
229 int whichfork); /* data or attr fork */
230
231 /*
232 * Convert a local file to an extents file.
233 * This code is sort of bogus, since the file data needs to get
234 * logged so it won't be lost. The bmap-level manipulations are ok, though.
235 */
236 STATIC int /* error */
237 xfs_bmap_local_to_extents(
238 xfs_trans_t *tp, /* transaction pointer */
239 xfs_inode_t *ip, /* incore inode pointer */
240 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
241 xfs_extlen_t total, /* total blocks needed by transaction */
242 int *logflagsp, /* inode logging flags */
243 int whichfork); /* data or attr fork */
244
245 /*
246 * Search the extents list for the inode, for the extent containing bno.
247 * If bno lies in a hole, point to the next entry. If bno lies past eof,
248 * *eofp will be set, and *prevp will contain the last entry (null if none).
249 * Else, *lastxp will be set to the index of the found
250 * entry; *gotp will contain the entry.
251 */
252 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
253 xfs_bmap_search_extents(
254 xfs_inode_t *ip, /* incore inode pointer */
255 xfs_fileoff_t bno, /* block number searched for */
256 int whichfork, /* data or attr fork */
257 int *eofp, /* out: end of file found */
258 xfs_extnum_t *lastxp, /* out: last extent index */
259 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
260 xfs_bmbt_irec_t *prevp); /* out: previous extent entry found */
261
262 /*
263 * Check the last inode extent to determine whether this allocation will result
264 * in blocks being allocated at the end of the file. When we allocate new data
265 * blocks at the end of the file which do not start at the previous data block,
266 * we will try to align the new blocks at stripe unit boundaries.
267 */
268 STATIC int /* error */
269 xfs_bmap_isaeof(
270 xfs_inode_t *ip, /* incore inode pointer */
271 xfs_fileoff_t off, /* file offset in fsblocks */
272 int whichfork, /* data or attribute fork */
273 char *aeof); /* return value */
274
275 #ifdef XFS_BMAP_TRACE
276 /*
277 * Add bmap trace entry prior to a call to xfs_iext_remove.
278 */
279 STATIC void
280 xfs_bmap_trace_delete(
281 const char *fname, /* function name */
282 char *desc, /* operation description */
283 xfs_inode_t *ip, /* incore inode pointer */
284 xfs_extnum_t idx, /* index of entry(entries) deleted */
285 xfs_extnum_t cnt, /* count of entries deleted, 1 or 2 */
286 int whichfork); /* data or attr fork */
287
288 /*
289 * Add bmap trace entry prior to a call to xfs_iext_insert, or
290 * reading in the extents list from the disk (in the btree).
291 */
292 STATIC void
293 xfs_bmap_trace_insert(
294 const char *fname, /* function name */
295 char *desc, /* operation description */
296 xfs_inode_t *ip, /* incore inode pointer */
297 xfs_extnum_t idx, /* index of entry(entries) inserted */
298 xfs_extnum_t cnt, /* count of entries inserted, 1 or 2 */
299 xfs_bmbt_irec_t *r1, /* inserted record 1 */
300 xfs_bmbt_irec_t *r2, /* inserted record 2 or null */
301 int whichfork); /* data or attr fork */
302
303 /*
304 * Add bmap trace entry after updating an extent record in place.
305 */
306 STATIC void
307 xfs_bmap_trace_post_update(
308 const char *fname, /* function name */
309 char *desc, /* operation description */
310 xfs_inode_t *ip, /* incore inode pointer */
311 xfs_extnum_t idx, /* index of entry updated */
312 int whichfork); /* data or attr fork */
313
314 /*
315 * Add bmap trace entry prior to updating an extent record in place.
316 */
317 STATIC void
318 xfs_bmap_trace_pre_update(
319 const char *fname, /* function name */
320 char *desc, /* operation description */
321 xfs_inode_t *ip, /* incore inode pointer */
322 xfs_extnum_t idx, /* index of entry to be updated */
323 int whichfork); /* data or attr fork */
324
325 #define XFS_BMAP_TRACE_DELETE(d,ip,i,c,w) \
326 xfs_bmap_trace_delete(__FUNCTION__,d,ip,i,c,w)
327 #define XFS_BMAP_TRACE_INSERT(d,ip,i,c,r1,r2,w) \
328 xfs_bmap_trace_insert(__FUNCTION__,d,ip,i,c,r1,r2,w)
329 #define XFS_BMAP_TRACE_POST_UPDATE(d,ip,i,w) \
330 xfs_bmap_trace_post_update(__FUNCTION__,d,ip,i,w)
331 #define XFS_BMAP_TRACE_PRE_UPDATE(d,ip,i,w) \
332 xfs_bmap_trace_pre_update(__FUNCTION__,d,ip,i,w)
333 #else
334 #define XFS_BMAP_TRACE_DELETE(d,ip,i,c,w)
335 #define XFS_BMAP_TRACE_INSERT(d,ip,i,c,r1,r2,w)
336 #define XFS_BMAP_TRACE_POST_UPDATE(d,ip,i,w)
337 #define XFS_BMAP_TRACE_PRE_UPDATE(d,ip,i,w)
338 #endif /* XFS_BMAP_TRACE */
339
340 /*
341 * Compute the worst-case number of indirect blocks that will be used
342 * for ip's delayed extent of length "len".
343 */
344 STATIC xfs_filblks_t
345 xfs_bmap_worst_indlen(
346 xfs_inode_t *ip, /* incore inode pointer */
347 xfs_filblks_t len); /* delayed extent length */
348
349 #ifdef DEBUG
350 /*
351 * Perform various validation checks on the values being returned
352 * from xfs_bmapi().
353 */
354 STATIC void
355 xfs_bmap_validate_ret(
356 xfs_fileoff_t bno,
357 xfs_filblks_t len,
358 int flags,
359 xfs_bmbt_irec_t *mval,
360 int nmap,
361 int ret_nmap);
362 #else
363 #define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
364 #endif /* DEBUG */
365
366 #if defined(XFS_RW_TRACE)
367 STATIC void
368 xfs_bunmap_trace(
369 xfs_inode_t *ip,
370 xfs_fileoff_t bno,
371 xfs_filblks_t len,
372 int flags,
373 inst_t *ra);
374 #else
375 #define xfs_bunmap_trace(ip, bno, len, flags, ra)
376 #endif /* XFS_RW_TRACE */
377
378 STATIC int
379 xfs_bmap_count_tree(
380 xfs_mount_t *mp,
381 xfs_trans_t *tp,
382 xfs_ifork_t *ifp,
383 xfs_fsblock_t blockno,
384 int levelin,
385 int *count);
386
387 STATIC int
388 xfs_bmap_count_leaves(
389 xfs_ifork_t *ifp,
390 xfs_extnum_t idx,
391 int numrecs,
392 int *count);
393
394 STATIC int
395 xfs_bmap_disk_count_leaves(
396 xfs_extnum_t idx,
397 xfs_bmbt_block_t *block,
398 int numrecs,
399 int *count);
400
401 /*
402 * Bmap internal routines.
403 */
404
405 /*
406 * Called from xfs_bmap_add_attrfork to handle btree format files.
407 */
408 STATIC int /* error */
409 xfs_bmap_add_attrfork_btree(
410 xfs_trans_t *tp, /* transaction pointer */
411 xfs_inode_t *ip, /* incore inode pointer */
412 xfs_fsblock_t *firstblock, /* first block allocated */
413 xfs_bmap_free_t *flist, /* blocks to free at commit */
414 int *flags) /* inode logging flags */
415 {
416 xfs_btree_cur_t *cur; /* btree cursor */
417 int error; /* error return value */
418 xfs_mount_t *mp; /* file system mount struct */
419 int stat; /* newroot status */
420
421 mp = ip->i_mount;
422 if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
423 *flags |= XFS_ILOG_DBROOT;
424 else {
425 cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
426 XFS_DATA_FORK);
427 cur->bc_private.b.flist = flist;
428 cur->bc_private.b.firstblock = *firstblock;
429 if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
430 goto error0;
431 ASSERT(stat == 1); /* must be at least one entry */
432 if ((error = xfs_bmbt_newroot(cur, flags, &stat)))
433 goto error0;
434 if (stat == 0) {
435 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
436 return XFS_ERROR(ENOSPC);
437 }
438 *firstblock = cur->bc_private.b.firstblock;
439 cur->bc_private.b.allocated = 0;
440 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
441 }
442 return 0;
443 error0:
444 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
445 return error;
446 }
447
448 /*
449 * Called from xfs_bmap_add_attrfork to handle extents format files.
450 */
451 STATIC int /* error */
452 xfs_bmap_add_attrfork_extents(
453 xfs_trans_t *tp, /* transaction pointer */
454 xfs_inode_t *ip, /* incore inode pointer */
455 xfs_fsblock_t *firstblock, /* first block allocated */
456 xfs_bmap_free_t *flist, /* blocks to free at commit */
457 int *flags) /* inode logging flags */
458 {
459 xfs_btree_cur_t *cur; /* bmap btree cursor */
460 int error; /* error return value */
461
462 if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
463 return 0;
464 cur = NULL;
465 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist, &cur, 0,
466 flags, XFS_DATA_FORK);
467 if (cur) {
468 cur->bc_private.b.allocated = 0;
469 xfs_btree_del_cursor(cur,
470 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
471 }
472 return error;
473 }
474
475 /*
476 * Called from xfs_bmap_add_attrfork to handle local format files.
477 */
478 STATIC int /* error */
479 xfs_bmap_add_attrfork_local(
480 xfs_trans_t *tp, /* transaction pointer */
481 xfs_inode_t *ip, /* incore inode pointer */
482 xfs_fsblock_t *firstblock, /* first block allocated */
483 xfs_bmap_free_t *flist, /* blocks to free at commit */
484 int *flags) /* inode logging flags */
485 {
486 xfs_da_args_t dargs; /* args for dir/attr code */
487 int error; /* error return value */
488 xfs_mount_t *mp; /* mount structure pointer */
489
490 if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
491 return 0;
492 if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
493 mp = ip->i_mount;
494 memset(&dargs, 0, sizeof(dargs));
495 dargs.dp = ip;
496 dargs.firstblock = firstblock;
497 dargs.flist = flist;
498 dargs.total = mp->m_dirblkfsbs;
499 dargs.whichfork = XFS_DATA_FORK;
500 dargs.trans = tp;
501 error = xfs_dir2_sf_to_block(&dargs);
502 } else
503 error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
504 XFS_DATA_FORK);
505 return error;
506 }
507
508 /*
509 * Called by xfs_bmapi to update file extent records and the btree
510 * after allocating space (or doing a delayed allocation).
511 */
512 STATIC int /* error */
513 xfs_bmap_add_extent(
514 xfs_inode_t *ip, /* incore inode pointer */
515 xfs_extnum_t idx, /* extent number to update/insert */
516 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
517 xfs_bmbt_irec_t *new, /* new data to add to file extents */
518 xfs_fsblock_t *first, /* pointer to firstblock variable */
519 xfs_bmap_free_t *flist, /* list of extents to be freed */
520 int *logflagsp, /* inode logging flags */
521 xfs_extdelta_t *delta, /* Change made to incore extents */
522 int whichfork, /* data or attr fork */
523 int rsvd) /* OK to use reserved data blocks */
524 {
525 xfs_btree_cur_t *cur; /* btree cursor or null */
526 xfs_filblks_t da_new; /* new count del alloc blocks used */
527 xfs_filblks_t da_old; /* old count del alloc blocks used */
528 int error; /* error return value */
529 xfs_ifork_t *ifp; /* inode fork ptr */
530 int logflags; /* returned value */
531 xfs_extnum_t nextents; /* number of extents in file now */
532
533 XFS_STATS_INC(xs_add_exlist);
534 cur = *curp;
535 ifp = XFS_IFORK_PTR(ip, whichfork);
536 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
537 ASSERT(idx <= nextents);
538 da_old = da_new = 0;
539 error = 0;
540 /*
541 * This is the first extent added to a new/empty file.
542 * Special case this one, so other routines get to assume there are
543 * already extents in the list.
544 */
545 if (nextents == 0) {
546 XFS_BMAP_TRACE_INSERT("insert empty", ip, 0, 1, new, NULL,
547 whichfork);
548 xfs_iext_insert(ifp, 0, 1, new);
549 ASSERT(cur == NULL);
550 ifp->if_lastex = 0;
551 if (!ISNULLSTARTBLOCK(new->br_startblock)) {
552 XFS_IFORK_NEXT_SET(ip, whichfork, 1);
553 logflags = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
554 } else
555 logflags = 0;
556 /* DELTA: single new extent */
557 if (delta) {
558 if (delta->xed_startoff > new->br_startoff)
559 delta->xed_startoff = new->br_startoff;
560 if (delta->xed_blockcount <
561 new->br_startoff + new->br_blockcount)
562 delta->xed_blockcount = new->br_startoff +
563 new->br_blockcount;
564 }
565 }
566 /*
567 * Any kind of new delayed allocation goes here.
568 */
569 else if (ISNULLSTARTBLOCK(new->br_startblock)) {
570 if (cur)
571 ASSERT((cur->bc_private.b.flags &
572 XFS_BTCUR_BPRV_WASDEL) == 0);
573 if ((error = xfs_bmap_add_extent_hole_delay(ip, idx, new,
574 &logflags, delta, rsvd)))
575 goto done;
576 }
577 /*
578 * Real allocation off the end of the file.
579 */
580 else if (idx == nextents) {
581 if (cur)
582 ASSERT((cur->bc_private.b.flags &
583 XFS_BTCUR_BPRV_WASDEL) == 0);
584 if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur, new,
585 &logflags, delta, whichfork)))
586 goto done;
587 } else {
588 xfs_bmbt_irec_t prev; /* old extent at offset idx */
589
590 /*
591 * Get the record referred to by idx.
592 */
593 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx), &prev);
594 /*
595 * If it's a real allocation record, and the new allocation ends
596 * after the start of the referred to record, then we're filling
597 * in a delayed or unwritten allocation with a real one, or
598 * converting real back to unwritten.
599 */
600 if (!ISNULLSTARTBLOCK(new->br_startblock) &&
601 new->br_startoff + new->br_blockcount > prev.br_startoff) {
602 if (prev.br_state != XFS_EXT_UNWRITTEN &&
603 ISNULLSTARTBLOCK(prev.br_startblock)) {
604 da_old = STARTBLOCKVAL(prev.br_startblock);
605 if (cur)
606 ASSERT(cur->bc_private.b.flags &
607 XFS_BTCUR_BPRV_WASDEL);
608 if ((error = xfs_bmap_add_extent_delay_real(ip,
609 idx, &cur, new, &da_new, first, flist,
610 &logflags, delta, rsvd)))
611 goto done;
612 } else if (new->br_state == XFS_EXT_NORM) {
613 ASSERT(new->br_state == XFS_EXT_NORM);
614 if ((error = xfs_bmap_add_extent_unwritten_real(
615 ip, idx, &cur, new, &logflags, delta)))
616 goto done;
617 } else {
618 ASSERT(new->br_state == XFS_EXT_UNWRITTEN);
619 if ((error = xfs_bmap_add_extent_unwritten_real(
620 ip, idx, &cur, new, &logflags, delta)))
621 goto done;
622 }
623 ASSERT(*curp == cur || *curp == NULL);
624 }
625 /*
626 * Otherwise we're filling in a hole with an allocation.
627 */
628 else {
629 if (cur)
630 ASSERT((cur->bc_private.b.flags &
631 XFS_BTCUR_BPRV_WASDEL) == 0);
632 if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur,
633 new, &logflags, delta, whichfork)))
634 goto done;
635 }
636 }
637
638 ASSERT(*curp == cur || *curp == NULL);
639 /*
640 * Convert to a btree if necessary.
641 */
642 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
643 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
644 int tmp_logflags; /* partial log flag return val */
645
646 ASSERT(cur == NULL);
647 error = xfs_bmap_extents_to_btree(ip->i_transp, ip, first,
648 flist, &cur, da_old > 0, &tmp_logflags, whichfork);
649 logflags |= tmp_logflags;
650 if (error)
651 goto done;
652 }
653 /*
654 * Adjust for changes in reserved delayed indirect blocks.
655 * Nothing to do for disk quotas here.
656 */
657 if (da_old || da_new) {
658 xfs_filblks_t nblks;
659
660 nblks = da_new;
661 if (cur)
662 nblks += cur->bc_private.b.allocated;
663 ASSERT(nblks <= da_old);
664 if (nblks < da_old)
665 xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
666 (int64_t)(da_old - nblks), rsvd);
667 }
668 /*
669 * Clear out the allocated field, done with it now in any case.
670 */
671 if (cur) {
672 cur->bc_private.b.allocated = 0;
673 *curp = cur;
674 }
675 done:
676 #ifdef DEBUG
677 if (!error)
678 xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
679 #endif
680 *logflagsp = logflags;
681 return error;
682 }
683
684 /*
685 * Called by xfs_bmap_add_extent to handle cases converting a delayed
686 * allocation to a real allocation.
687 */
688 STATIC int /* error */
689 xfs_bmap_add_extent_delay_real(
690 xfs_inode_t *ip, /* incore inode pointer */
691 xfs_extnum_t idx, /* extent number to update/insert */
692 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
693 xfs_bmbt_irec_t *new, /* new data to add to file extents */
694 xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
695 xfs_fsblock_t *first, /* pointer to firstblock variable */
696 xfs_bmap_free_t *flist, /* list of extents to be freed */
697 int *logflagsp, /* inode logging flags */
698 xfs_extdelta_t *delta, /* Change made to incore extents */
699 int rsvd) /* OK to use reserved data block allocation */
700 {
701 xfs_btree_cur_t *cur; /* btree cursor */
702 int diff; /* temp value */
703 xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
704 int error; /* error return value */
705 int i; /* temp state */
706 xfs_ifork_t *ifp; /* inode fork pointer */
707 xfs_fileoff_t new_endoff; /* end offset of new entry */
708 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
709 /* left is 0, right is 1, prev is 2 */
710 int rval=0; /* return value (logging flags) */
711 int state = 0;/* state bits, accessed thru macros */
712 xfs_filblks_t temp=0; /* value for dnew calculations */
713 xfs_filblks_t temp2=0;/* value for dnew calculations */
714 int tmp_rval; /* partial logging flags */
715 enum { /* bit number definitions for state */
716 LEFT_CONTIG, RIGHT_CONTIG,
717 LEFT_FILLING, RIGHT_FILLING,
718 LEFT_DELAY, RIGHT_DELAY,
719 LEFT_VALID, RIGHT_VALID
720 };
721
722 #define LEFT r[0]
723 #define RIGHT r[1]
724 #define PREV r[2]
725 #define MASK(b) (1 << (b))
726 #define MASK2(a,b) (MASK(a) | MASK(b))
727 #define MASK3(a,b,c) (MASK2(a,b) | MASK(c))
728 #define MASK4(a,b,c,d) (MASK3(a,b,c) | MASK(d))
729 #define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
730 #define STATE_TEST(b) (state & MASK(b))
731 #define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
732 ((state &= ~MASK(b)), 0))
733 #define SWITCH_STATE \
734 (state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
735
736 /*
737 * Set up a bunch of variables to make the tests simpler.
738 */
739 cur = *curp;
740 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
741 ep = xfs_iext_get_ext(ifp, idx);
742 xfs_bmbt_get_all(ep, &PREV);
743 new_endoff = new->br_startoff + new->br_blockcount;
744 ASSERT(PREV.br_startoff <= new->br_startoff);
745 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
746 /*
747 * Set flags determining what part of the previous delayed allocation
748 * extent is being replaced by a real allocation.
749 */
750 STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
751 STATE_SET(RIGHT_FILLING,
752 PREV.br_startoff + PREV.br_blockcount == new_endoff);
753 /*
754 * Check and set flags if this segment has a left neighbor.
755 * Don't set contiguous if the combined extent would be too large.
756 */
757 if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
758 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &LEFT);
759 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
760 }
761 STATE_SET(LEFT_CONTIG,
762 STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
763 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
764 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
765 LEFT.br_state == new->br_state &&
766 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
767 /*
768 * Check and set flags if this segment has a right neighbor.
769 * Don't set contiguous if the combined extent would be too large.
770 * Also check for all-three-contiguous being too large.
771 */
772 if (STATE_SET_TEST(RIGHT_VALID,
773 idx <
774 ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
775 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx + 1), &RIGHT);
776 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
777 }
778 STATE_SET(RIGHT_CONTIG,
779 STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
780 new_endoff == RIGHT.br_startoff &&
781 new->br_startblock + new->br_blockcount ==
782 RIGHT.br_startblock &&
783 new->br_state == RIGHT.br_state &&
784 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
785 ((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
786 MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
787 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
788 <= MAXEXTLEN));
789 error = 0;
790 /*
791 * Switch out based on the FILLING and CONTIG state bits.
792 */
793 switch (SWITCH_STATE) {
794
795 case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
796 /*
797 * Filling in all of a previously delayed allocation extent.
798 * The left and right neighbors are both contiguous with new.
799 */
800 XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|LC|RC", ip, idx - 1,
801 XFS_DATA_FORK);
802 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
803 LEFT.br_blockcount + PREV.br_blockcount +
804 RIGHT.br_blockcount);
805 XFS_BMAP_TRACE_POST_UPDATE("LF|RF|LC|RC", ip, idx - 1,
806 XFS_DATA_FORK);
807 XFS_BMAP_TRACE_DELETE("LF|RF|LC|RC", ip, idx, 2, XFS_DATA_FORK);
808 xfs_iext_remove(ifp, idx, 2);
809 ip->i_df.if_lastex = idx - 1;
810 ip->i_d.di_nextents--;
811 if (cur == NULL)
812 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
813 else {
814 rval = XFS_ILOG_CORE;
815 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
816 RIGHT.br_startblock,
817 RIGHT.br_blockcount, &i)))
818 goto done;
819 ASSERT(i == 1);
820 if ((error = xfs_bmbt_delete(cur, &i)))
821 goto done;
822 ASSERT(i == 1);
823 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
824 goto done;
825 ASSERT(i == 1);
826 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
827 LEFT.br_startblock,
828 LEFT.br_blockcount +
829 PREV.br_blockcount +
830 RIGHT.br_blockcount, LEFT.br_state)))
831 goto done;
832 }
833 *dnew = 0;
834 /* DELTA: Three in-core extents are replaced by one. */
835 temp = LEFT.br_startoff;
836 temp2 = LEFT.br_blockcount +
837 PREV.br_blockcount +
838 RIGHT.br_blockcount;
839 break;
840
841 case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
842 /*
843 * Filling in all of a previously delayed allocation extent.
844 * The left neighbor is contiguous, the right is not.
845 */
846 XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|LC", ip, idx - 1,
847 XFS_DATA_FORK);
848 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
849 LEFT.br_blockcount + PREV.br_blockcount);
850 XFS_BMAP_TRACE_POST_UPDATE("LF|RF|LC", ip, idx - 1,
851 XFS_DATA_FORK);
852 ip->i_df.if_lastex = idx - 1;
853 XFS_BMAP_TRACE_DELETE("LF|RF|LC", ip, idx, 1, XFS_DATA_FORK);
854 xfs_iext_remove(ifp, idx, 1);
855 if (cur == NULL)
856 rval = XFS_ILOG_DEXT;
857 else {
858 rval = 0;
859 if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
860 LEFT.br_startblock, LEFT.br_blockcount,
861 &i)))
862 goto done;
863 ASSERT(i == 1);
864 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
865 LEFT.br_startblock,
866 LEFT.br_blockcount +
867 PREV.br_blockcount, LEFT.br_state)))
868 goto done;
869 }
870 *dnew = 0;
871 /* DELTA: Two in-core extents are replaced by one. */
872 temp = LEFT.br_startoff;
873 temp2 = LEFT.br_blockcount +
874 PREV.br_blockcount;
875 break;
876
877 case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
878 /*
879 * Filling in all of a previously delayed allocation extent.
880 * The right neighbor is contiguous, the left is not.
881 */
882 XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|RC", ip, idx, XFS_DATA_FORK);
883 xfs_bmbt_set_startblock(ep, new->br_startblock);
884 xfs_bmbt_set_blockcount(ep,
885 PREV.br_blockcount + RIGHT.br_blockcount);
886 XFS_BMAP_TRACE_POST_UPDATE("LF|RF|RC", ip, idx, XFS_DATA_FORK);
887 ip->i_df.if_lastex = idx;
888 XFS_BMAP_TRACE_DELETE("LF|RF|RC", ip, idx + 1, 1, XFS_DATA_FORK);
889 xfs_iext_remove(ifp, idx + 1, 1);
890 if (cur == NULL)
891 rval = XFS_ILOG_DEXT;
892 else {
893 rval = 0;
894 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
895 RIGHT.br_startblock,
896 RIGHT.br_blockcount, &i)))
897 goto done;
898 ASSERT(i == 1);
899 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
900 new->br_startblock,
901 PREV.br_blockcount +
902 RIGHT.br_blockcount, PREV.br_state)))
903 goto done;
904 }
905 *dnew = 0;
906 /* DELTA: Two in-core extents are replaced by one. */
907 temp = PREV.br_startoff;
908 temp2 = PREV.br_blockcount +
909 RIGHT.br_blockcount;
910 break;
911
912 case MASK2(LEFT_FILLING, RIGHT_FILLING):
913 /*
914 * Filling in all of a previously delayed allocation extent.
915 * Neither the left nor right neighbors are contiguous with
916 * the new one.
917 */
918 XFS_BMAP_TRACE_PRE_UPDATE("LF|RF", ip, idx, XFS_DATA_FORK);
919 xfs_bmbt_set_startblock(ep, new->br_startblock);
920 XFS_BMAP_TRACE_POST_UPDATE("LF|RF", ip, idx, XFS_DATA_FORK);
921 ip->i_df.if_lastex = idx;
922 ip->i_d.di_nextents++;
923 if (cur == NULL)
924 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
925 else {
926 rval = XFS_ILOG_CORE;
927 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
928 new->br_startblock, new->br_blockcount,
929 &i)))
930 goto done;
931 ASSERT(i == 0);
932 cur->bc_rec.b.br_state = XFS_EXT_NORM;
933 if ((error = xfs_bmbt_insert(cur, &i)))
934 goto done;
935 ASSERT(i == 1);
936 }
937 *dnew = 0;
938 /* DELTA: The in-core extent described by new changed type. */
939 temp = new->br_startoff;
940 temp2 = new->br_blockcount;
941 break;
942
943 case MASK2(LEFT_FILLING, LEFT_CONTIG):
944 /*
945 * Filling in the first part of a previous delayed allocation.
946 * The left neighbor is contiguous.
947 */
948 XFS_BMAP_TRACE_PRE_UPDATE("LF|LC", ip, idx - 1, XFS_DATA_FORK);
949 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
950 LEFT.br_blockcount + new->br_blockcount);
951 xfs_bmbt_set_startoff(ep,
952 PREV.br_startoff + new->br_blockcount);
953 XFS_BMAP_TRACE_POST_UPDATE("LF|LC", ip, idx - 1, XFS_DATA_FORK);
954 temp = PREV.br_blockcount - new->br_blockcount;
955 XFS_BMAP_TRACE_PRE_UPDATE("LF|LC", ip, idx, XFS_DATA_FORK);
956 xfs_bmbt_set_blockcount(ep, temp);
957 ip->i_df.if_lastex = idx - 1;
958 if (cur == NULL)
959 rval = XFS_ILOG_DEXT;
960 else {
961 rval = 0;
962 if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
963 LEFT.br_startblock, LEFT.br_blockcount,
964 &i)))
965 goto done;
966 ASSERT(i == 1);
967 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
968 LEFT.br_startblock,
969 LEFT.br_blockcount +
970 new->br_blockcount,
971 LEFT.br_state)))
972 goto done;
973 }
974 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
975 STARTBLOCKVAL(PREV.br_startblock));
976 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
977 XFS_BMAP_TRACE_POST_UPDATE("LF|LC", ip, idx, XFS_DATA_FORK);
978 *dnew = temp;
979 /* DELTA: The boundary between two in-core extents moved. */
980 temp = LEFT.br_startoff;
981 temp2 = LEFT.br_blockcount +
982 PREV.br_blockcount;
983 break;
984
985 case MASK(LEFT_FILLING):
986 /*
987 * Filling in the first part of a previous delayed allocation.
988 * The left neighbor is not contiguous.
989 */
990 XFS_BMAP_TRACE_PRE_UPDATE("LF", ip, idx, XFS_DATA_FORK);
991 xfs_bmbt_set_startoff(ep, new_endoff);
992 temp = PREV.br_blockcount - new->br_blockcount;
993 xfs_bmbt_set_blockcount(ep, temp);
994 XFS_BMAP_TRACE_INSERT("LF", ip, idx, 1, new, NULL,
995 XFS_DATA_FORK);
996 xfs_iext_insert(ifp, idx, 1, new);
997 ip->i_df.if_lastex = idx;
998 ip->i_d.di_nextents++;
999 if (cur == NULL)
1000 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1001 else {
1002 rval = XFS_ILOG_CORE;
1003 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1004 new->br_startblock, new->br_blockcount,
1005 &i)))
1006 goto done;
1007 ASSERT(i == 0);
1008 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1009 if ((error = xfs_bmbt_insert(cur, &i)))
1010 goto done;
1011 ASSERT(i == 1);
1012 }
1013 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1014 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1015 error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
1016 first, flist, &cur, 1, &tmp_rval,
1017 XFS_DATA_FORK);
1018 rval |= tmp_rval;
1019 if (error)
1020 goto done;
1021 }
1022 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1023 STARTBLOCKVAL(PREV.br_startblock) -
1024 (cur ? cur->bc_private.b.allocated : 0));
1025 ep = xfs_iext_get_ext(ifp, idx + 1);
1026 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1027 XFS_BMAP_TRACE_POST_UPDATE("LF", ip, idx + 1, XFS_DATA_FORK);
1028 *dnew = temp;
1029 /* DELTA: One in-core extent is split in two. */
1030 temp = PREV.br_startoff;
1031 temp2 = PREV.br_blockcount;
1032 break;
1033
1034 case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
1035 /*
1036 * Filling in the last part of a previous delayed allocation.
1037 * The right neighbor is contiguous with the new allocation.
1038 */
1039 temp = PREV.br_blockcount - new->br_blockcount;
1040 XFS_BMAP_TRACE_PRE_UPDATE("RF|RC", ip, idx, XFS_DATA_FORK);
1041 XFS_BMAP_TRACE_PRE_UPDATE("RF|RC", ip, idx + 1, XFS_DATA_FORK);
1042 xfs_bmbt_set_blockcount(ep, temp);
1043 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, idx + 1),
1044 new->br_startoff, new->br_startblock,
1045 new->br_blockcount + RIGHT.br_blockcount,
1046 RIGHT.br_state);
1047 XFS_BMAP_TRACE_POST_UPDATE("RF|RC", ip, idx + 1, XFS_DATA_FORK);
1048 ip->i_df.if_lastex = idx + 1;
1049 if (cur == NULL)
1050 rval = XFS_ILOG_DEXT;
1051 else {
1052 rval = 0;
1053 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1054 RIGHT.br_startblock,
1055 RIGHT.br_blockcount, &i)))
1056 goto done;
1057 ASSERT(i == 1);
1058 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1059 new->br_startblock,
1060 new->br_blockcount +
1061 RIGHT.br_blockcount,
1062 RIGHT.br_state)))
1063 goto done;
1064 }
1065 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1066 STARTBLOCKVAL(PREV.br_startblock));
1067 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1068 XFS_BMAP_TRACE_POST_UPDATE("RF|RC", ip, idx, XFS_DATA_FORK);
1069 *dnew = temp;
1070 /* DELTA: The boundary between two in-core extents moved. */
1071 temp = PREV.br_startoff;
1072 temp2 = PREV.br_blockcount +
1073 RIGHT.br_blockcount;
1074 break;
1075
1076 case MASK(RIGHT_FILLING):
1077 /*
1078 * Filling in the last part of a previous delayed allocation.
1079 * The right neighbor is not contiguous.
1080 */
1081 temp = PREV.br_blockcount - new->br_blockcount;
1082 XFS_BMAP_TRACE_PRE_UPDATE("RF", ip, idx, XFS_DATA_FORK);
1083 xfs_bmbt_set_blockcount(ep, temp);
1084 XFS_BMAP_TRACE_INSERT("RF", ip, idx + 1, 1, new, NULL,
1085 XFS_DATA_FORK);
1086 xfs_iext_insert(ifp, idx + 1, 1, new);
1087 ip->i_df.if_lastex = idx + 1;
1088 ip->i_d.di_nextents++;
1089 if (cur == NULL)
1090 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1091 else {
1092 rval = XFS_ILOG_CORE;
1093 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1094 new->br_startblock, new->br_blockcount,
1095 &i)))
1096 goto done;
1097 ASSERT(i == 0);
1098 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1099 if ((error = xfs_bmbt_insert(cur, &i)))
1100 goto done;
1101 ASSERT(i == 1);
1102 }
1103 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1104 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1105 error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
1106 first, flist, &cur, 1, &tmp_rval,
1107 XFS_DATA_FORK);
1108 rval |= tmp_rval;
1109 if (error)
1110 goto done;
1111 }
1112 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1113 STARTBLOCKVAL(PREV.br_startblock) -
1114 (cur ? cur->bc_private.b.allocated : 0));
1115 ep = xfs_iext_get_ext(ifp, idx);
1116 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1117 XFS_BMAP_TRACE_POST_UPDATE("RF", ip, idx, XFS_DATA_FORK);
1118 *dnew = temp;
1119 /* DELTA: One in-core extent is split in two. */
1120 temp = PREV.br_startoff;
1121 temp2 = PREV.br_blockcount;
1122 break;
1123
1124 case 0:
1125 /*
1126 * Filling in the middle part of a previous delayed allocation.
1127 * Contiguity is impossible here.
1128 * This case is avoided almost all the time.
1129 */
1130 temp = new->br_startoff - PREV.br_startoff;
1131 XFS_BMAP_TRACE_PRE_UPDATE("0", ip, idx, XFS_DATA_FORK);
1132 xfs_bmbt_set_blockcount(ep, temp);
1133 r[0] = *new;
1134 r[1].br_state = PREV.br_state;
1135 r[1].br_startblock = 0;
1136 r[1].br_startoff = new_endoff;
1137 temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
1138 r[1].br_blockcount = temp2;
1139 XFS_BMAP_TRACE_INSERT("0", ip, idx + 1, 2, &r[0], &r[1],
1140 XFS_DATA_FORK);
1141 xfs_iext_insert(ifp, idx + 1, 2, &r[0]);
1142 ip->i_df.if_lastex = idx + 1;
1143 ip->i_d.di_nextents++;
1144 if (cur == NULL)
1145 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1146 else {
1147 rval = XFS_ILOG_CORE;
1148 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1149 new->br_startblock, new->br_blockcount,
1150 &i)))
1151 goto done;
1152 ASSERT(i == 0);
1153 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1154 if ((error = xfs_bmbt_insert(cur, &i)))
1155 goto done;
1156 ASSERT(i == 1);
1157 }
1158 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1159 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1160 error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
1161 first, flist, &cur, 1, &tmp_rval,
1162 XFS_DATA_FORK);
1163 rval |= tmp_rval;
1164 if (error)
1165 goto done;
1166 }
1167 temp = xfs_bmap_worst_indlen(ip, temp);
1168 temp2 = xfs_bmap_worst_indlen(ip, temp2);
1169 diff = (int)(temp + temp2 - STARTBLOCKVAL(PREV.br_startblock) -
1170 (cur ? cur->bc_private.b.allocated : 0));
1171 if (diff > 0 &&
1172 xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS, -((int64_t)diff), rsvd)) {
1173 /*
1174 * Ick gross gag me with a spoon.
1175 */
1176 ASSERT(0); /* want to see if this ever happens! */
1177 while (diff > 0) {
1178 if (temp) {
1179 temp--;
1180 diff--;
1181 if (!diff ||
1182 !xfs_mod_incore_sb(ip->i_mount,
1183 XFS_SBS_FDBLOCKS, -((int64_t)diff), rsvd))
1184 break;
1185 }
1186 if (temp2) {
1187 temp2--;
1188 diff--;
1189 if (!diff ||
1190 !xfs_mod_incore_sb(ip->i_mount,
1191 XFS_SBS_FDBLOCKS, -((int64_t)diff), rsvd))
1192 break;
1193 }
1194 }
1195 }
1196 ep = xfs_iext_get_ext(ifp, idx);
1197 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1198 XFS_BMAP_TRACE_POST_UPDATE("0", ip, idx, XFS_DATA_FORK);
1199 XFS_BMAP_TRACE_PRE_UPDATE("0", ip, idx + 2, XFS_DATA_FORK);
1200 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, idx + 2),
1201 NULLSTARTBLOCK((int)temp2));
1202 XFS_BMAP_TRACE_POST_UPDATE("0", ip, idx + 2, XFS_DATA_FORK);
1203 *dnew = temp + temp2;
1204 /* DELTA: One in-core extent is split in three. */
1205 temp = PREV.br_startoff;
1206 temp2 = PREV.br_blockcount;
1207 break;
1208
1209 case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1210 case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1211 case MASK2(LEFT_FILLING, RIGHT_CONTIG):
1212 case MASK2(RIGHT_FILLING, LEFT_CONTIG):
1213 case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
1214 case MASK(LEFT_CONTIG):
1215 case MASK(RIGHT_CONTIG):
1216 /*
1217 * These cases are all impossible.
1218 */
1219 ASSERT(0);
1220 }
1221 *curp = cur;
1222 if (delta) {
1223 temp2 += temp;
1224 if (delta->xed_startoff > temp)
1225 delta->xed_startoff = temp;
1226 if (delta->xed_blockcount < temp2)
1227 delta->xed_blockcount = temp2;
1228 }
1229 done:
1230 *logflagsp = rval;
1231 return error;
1232 #undef LEFT
1233 #undef RIGHT
1234 #undef PREV
1235 #undef MASK
1236 #undef MASK2
1237 #undef MASK3
1238 #undef MASK4
1239 #undef STATE_SET
1240 #undef STATE_TEST
1241 #undef STATE_SET_TEST
1242 #undef SWITCH_STATE
1243 }
1244
1245 /*
1246 * Called by xfs_bmap_add_extent to handle cases converting an unwritten
1247 * allocation to a real allocation or vice versa.
1248 */
1249 STATIC int /* error */
1250 xfs_bmap_add_extent_unwritten_real(
1251 xfs_inode_t *ip, /* incore inode pointer */
1252 xfs_extnum_t idx, /* extent number to update/insert */
1253 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
1254 xfs_bmbt_irec_t *new, /* new data to add to file extents */
1255 int *logflagsp, /* inode logging flags */
1256 xfs_extdelta_t *delta) /* Change made to incore extents */
1257 {
1258 xfs_btree_cur_t *cur; /* btree cursor */
1259 xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
1260 int error; /* error return value */
1261 int i; /* temp state */
1262 xfs_ifork_t *ifp; /* inode fork pointer */
1263 xfs_fileoff_t new_endoff; /* end offset of new entry */
1264 xfs_exntst_t newext; /* new extent state */
1265 xfs_exntst_t oldext; /* old extent state */
1266 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
1267 /* left is 0, right is 1, prev is 2 */
1268 int rval=0; /* return value (logging flags) */
1269 int state = 0;/* state bits, accessed thru macros */
1270 xfs_filblks_t temp=0;
1271 xfs_filblks_t temp2=0;
1272 enum { /* bit number definitions for state */
1273 LEFT_CONTIG, RIGHT_CONTIG,
1274 LEFT_FILLING, RIGHT_FILLING,
1275 LEFT_DELAY, RIGHT_DELAY,
1276 LEFT_VALID, RIGHT_VALID
1277 };
1278
1279 #define LEFT r[0]
1280 #define RIGHT r[1]
1281 #define PREV r[2]
1282 #define MASK(b) (1 << (b))
1283 #define MASK2(a,b) (MASK(a) | MASK(b))
1284 #define MASK3(a,b,c) (MASK2(a,b) | MASK(c))
1285 #define MASK4(a,b,c,d) (MASK3(a,b,c) | MASK(d))
1286 #define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
1287 #define STATE_TEST(b) (state & MASK(b))
1288 #define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
1289 ((state &= ~MASK(b)), 0))
1290 #define SWITCH_STATE \
1291 (state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
1292
1293 /*
1294 * Set up a bunch of variables to make the tests simpler.
1295 */
1296 error = 0;
1297 cur = *curp;
1298 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1299 ep = xfs_iext_get_ext(ifp, idx);
1300 xfs_bmbt_get_all(ep, &PREV);
1301 newext = new->br_state;
1302 oldext = (newext == XFS_EXT_UNWRITTEN) ?
1303 XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
1304 ASSERT(PREV.br_state == oldext);
1305 new_endoff = new->br_startoff + new->br_blockcount;
1306 ASSERT(PREV.br_startoff <= new->br_startoff);
1307 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
1308 /*
1309 * Set flags determining what part of the previous oldext allocation
1310 * extent is being replaced by a newext allocation.
1311 */
1312 STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
1313 STATE_SET(RIGHT_FILLING,
1314 PREV.br_startoff + PREV.br_blockcount == new_endoff);
1315 /*
1316 * Check and set flags if this segment has a left neighbor.
1317 * Don't set contiguous if the combined extent would be too large.
1318 */
1319 if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
1320 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &LEFT);
1321 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
1322 }
1323 STATE_SET(LEFT_CONTIG,
1324 STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
1325 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
1326 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
1327 LEFT.br_state == newext &&
1328 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
1329 /*
1330 * Check and set flags if this segment has a right neighbor.
1331 * Don't set contiguous if the combined extent would be too large.
1332 * Also check for all-three-contiguous being too large.
1333 */
1334 if (STATE_SET_TEST(RIGHT_VALID,
1335 idx <
1336 ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
1337 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx + 1), &RIGHT);
1338 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
1339 }
1340 STATE_SET(RIGHT_CONTIG,
1341 STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
1342 new_endoff == RIGHT.br_startoff &&
1343 new->br_startblock + new->br_blockcount ==
1344 RIGHT.br_startblock &&
1345 newext == RIGHT.br_state &&
1346 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
1347 ((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
1348 MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
1349 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
1350 <= MAXEXTLEN));
1351 /*
1352 * Switch out based on the FILLING and CONTIG state bits.
1353 */
1354 switch (SWITCH_STATE) {
1355
1356 case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1357 /*
1358 * Setting all of a previous oldext extent to newext.
1359 * The left and right neighbors are both contiguous with new.
1360 */
1361 XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|LC|RC", ip, idx - 1,
1362 XFS_DATA_FORK);
1363 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
1364 LEFT.br_blockcount + PREV.br_blockcount +
1365 RIGHT.br_blockcount);
1366 XFS_BMAP_TRACE_POST_UPDATE("LF|RF|LC|RC", ip, idx - 1,
1367 XFS_DATA_FORK);
1368 XFS_BMAP_TRACE_DELETE("LF|RF|LC|RC", ip, idx, 2, XFS_DATA_FORK);
1369 xfs_iext_remove(ifp, idx, 2);
1370 ip->i_df.if_lastex = idx - 1;
1371 ip->i_d.di_nextents -= 2;
1372 if (cur == NULL)
1373 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1374 else {
1375 rval = XFS_ILOG_CORE;
1376 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1377 RIGHT.br_startblock,
1378 RIGHT.br_blockcount, &i)))
1379 goto done;
1380 ASSERT(i == 1);
1381 if ((error = xfs_bmbt_delete(cur, &i)))
1382 goto done;
1383 ASSERT(i == 1);
1384 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1385 goto done;
1386 ASSERT(i == 1);
1387 if ((error = xfs_bmbt_delete(cur, &i)))
1388 goto done;
1389 ASSERT(i == 1);
1390 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1391 goto done;
1392 ASSERT(i == 1);
1393 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1394 LEFT.br_startblock,
1395 LEFT.br_blockcount + PREV.br_blockcount +
1396 RIGHT.br_blockcount, LEFT.br_state)))
1397 goto done;
1398 }
1399 /* DELTA: Three in-core extents are replaced by one. */
1400 temp = LEFT.br_startoff;
1401 temp2 = LEFT.br_blockcount +
1402 PREV.br_blockcount +
1403 RIGHT.br_blockcount;
1404 break;
1405
1406 case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
1407 /*
1408 * Setting all of a previous oldext extent to newext.
1409 * The left neighbor is contiguous, the right is not.
1410 */
1411 XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|LC", ip, idx - 1,
1412 XFS_DATA_FORK);
1413 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
1414 LEFT.br_blockcount + PREV.br_blockcount);
1415 XFS_BMAP_TRACE_POST_UPDATE("LF|RF|LC", ip, idx - 1,
1416 XFS_DATA_FORK);
1417 ip->i_df.if_lastex = idx - 1;
1418 XFS_BMAP_TRACE_DELETE("LF|RF|LC", ip, idx, 1, XFS_DATA_FORK);
1419 xfs_iext_remove(ifp, idx, 1);
1420 ip->i_d.di_nextents--;
1421 if (cur == NULL)
1422 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1423 else {
1424 rval = XFS_ILOG_CORE;
1425 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1426 PREV.br_startblock, PREV.br_blockcount,
1427 &i)))
1428 goto done;
1429 ASSERT(i == 1);
1430 if ((error = xfs_bmbt_delete(cur, &i)))
1431 goto done;
1432 ASSERT(i == 1);
1433 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1434 goto done;
1435 ASSERT(i == 1);
1436 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1437 LEFT.br_startblock,
1438 LEFT.br_blockcount + PREV.br_blockcount,
1439 LEFT.br_state)))
1440 goto done;
1441 }
1442 /* DELTA: Two in-core extents are replaced by one. */
1443 temp = LEFT.br_startoff;
1444 temp2 = LEFT.br_blockcount +
1445 PREV.br_blockcount;
1446 break;
1447
1448 case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
1449 /*
1450 * Setting all of a previous oldext extent to newext.
1451 * The right neighbor is contiguous, the left is not.
1452 */
1453 XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|RC", ip, idx,
1454 XFS_DATA_FORK);
1455 xfs_bmbt_set_blockcount(ep,
1456 PREV.br_blockcount + RIGHT.br_blockcount);
1457 xfs_bmbt_set_state(ep, newext);
1458 XFS_BMAP_TRACE_POST_UPDATE("LF|RF|RC", ip, idx,
1459 XFS_DATA_FORK);
1460 ip->i_df.if_lastex = idx;
1461 XFS_BMAP_TRACE_DELETE("LF|RF|RC", ip, idx + 1, 1, XFS_DATA_FORK);
1462 xfs_iext_remove(ifp, idx + 1, 1);
1463 ip->i_d.di_nextents--;
1464 if (cur == NULL)
1465 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1466 else {
1467 rval = XFS_ILOG_CORE;
1468 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1469 RIGHT.br_startblock,
1470 RIGHT.br_blockcount, &i)))
1471 goto done;
1472 ASSERT(i == 1);
1473 if ((error = xfs_bmbt_delete(cur, &i)))
1474 goto done;
1475 ASSERT(i == 1);
1476 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1477 goto done;
1478 ASSERT(i == 1);
1479 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1480 new->br_startblock,
1481 new->br_blockcount + RIGHT.br_blockcount,
1482 newext)))
1483 goto done;
1484 }
1485 /* DELTA: Two in-core extents are replaced by one. */
1486 temp = PREV.br_startoff;
1487 temp2 = PREV.br_blockcount +
1488 RIGHT.br_blockcount;
1489 break;
1490
1491 case MASK2(LEFT_FILLING, RIGHT_FILLING):
1492 /*
1493 * Setting all of a previous oldext extent to newext.
1494 * Neither the left nor right neighbors are contiguous with
1495 * the new one.
1496 */
1497 XFS_BMAP_TRACE_PRE_UPDATE("LF|RF", ip, idx,
1498 XFS_DATA_FORK);
1499 xfs_bmbt_set_state(ep, newext);
1500 XFS_BMAP_TRACE_POST_UPDATE("LF|RF", ip, idx,
1501 XFS_DATA_FORK);
1502 ip->i_df.if_lastex = idx;
1503 if (cur == NULL)
1504 rval = XFS_ILOG_DEXT;
1505 else {
1506 rval = 0;
1507 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1508 new->br_startblock, new->br_blockcount,
1509 &i)))
1510 goto done;
1511 ASSERT(i == 1);
1512 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1513 new->br_startblock, new->br_blockcount,
1514 newext)))
1515 goto done;
1516 }
1517 /* DELTA: The in-core extent described by new changed type. */
1518 temp = new->br_startoff;
1519 temp2 = new->br_blockcount;
1520 break;
1521
1522 case MASK2(LEFT_FILLING, LEFT_CONTIG):
1523 /*
1524 * Setting the first part of a previous oldext extent to newext.
1525 * The left neighbor is contiguous.
1526 */
1527 XFS_BMAP_TRACE_PRE_UPDATE("LF|LC", ip, idx - 1,
1528 XFS_DATA_FORK);
1529 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
1530 LEFT.br_blockcount + new->br_blockcount);
1531 xfs_bmbt_set_startoff(ep,
1532 PREV.br_startoff + new->br_blockcount);
1533 XFS_BMAP_TRACE_POST_UPDATE("LF|LC", ip, idx - 1,
1534 XFS_DATA_FORK);
1535 XFS_BMAP_TRACE_PRE_UPDATE("LF|LC", ip, idx,
1536 XFS_DATA_FORK);
1537 xfs_bmbt_set_startblock(ep,
1538 new->br_startblock + new->br_blockcount);
1539 xfs_bmbt_set_blockcount(ep,
1540 PREV.br_blockcount - new->br_blockcount);
1541 XFS_BMAP_TRACE_POST_UPDATE("LF|LC", ip, idx,
1542 XFS_DATA_FORK);
1543 ip->i_df.if_lastex = idx - 1;
1544 if (cur == NULL)
1545 rval = XFS_ILOG_DEXT;
1546 else {
1547 rval = 0;
1548 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1549 PREV.br_startblock, PREV.br_blockcount,
1550 &i)))
1551 goto done;
1552 ASSERT(i == 1);
1553 if ((error = xfs_bmbt_update(cur,
1554 PREV.br_startoff + new->br_blockcount,
1555 PREV.br_startblock + new->br_blockcount,
1556 PREV.br_blockcount - new->br_blockcount,
1557 oldext)))
1558 goto done;
1559 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1560 goto done;
1561 if (xfs_bmbt_update(cur, LEFT.br_startoff,
1562 LEFT.br_startblock,
1563 LEFT.br_blockcount + new->br_blockcount,
1564 LEFT.br_state))
1565 goto done;
1566 }
1567 /* DELTA: The boundary between two in-core extents moved. */
1568 temp = LEFT.br_startoff;
1569 temp2 = LEFT.br_blockcount +
1570 PREV.br_blockcount;
1571 break;
1572
1573 case MASK(LEFT_FILLING):
1574 /*
1575 * Setting the first part of a previous oldext extent to newext.
1576 * The left neighbor is not contiguous.
1577 */
1578 XFS_BMAP_TRACE_PRE_UPDATE("LF", ip, idx, XFS_DATA_FORK);
1579 ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
1580 xfs_bmbt_set_startoff(ep, new_endoff);
1581 xfs_bmbt_set_blockcount(ep,
1582 PREV.br_blockcount - new->br_blockcount);
1583 xfs_bmbt_set_startblock(ep,
1584 new->br_startblock + new->br_blockcount);
1585 XFS_BMAP_TRACE_POST_UPDATE("LF", ip, idx, XFS_DATA_FORK);
1586 XFS_BMAP_TRACE_INSERT("LF", ip, idx, 1, new, NULL,
1587 XFS_DATA_FORK);
1588 xfs_iext_insert(ifp, idx, 1, new);
1589 ip->i_df.if_lastex = idx;
1590 ip->i_d.di_nextents++;
1591 if (cur == NULL)
1592 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1593 else {
1594 rval = XFS_ILOG_CORE;
1595 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1596 PREV.br_startblock, PREV.br_blockcount,
1597 &i)))
1598 goto done;
1599 ASSERT(i == 1);
1600 if ((error = xfs_bmbt_update(cur,
1601 PREV.br_startoff + new->br_blockcount,
1602 PREV.br_startblock + new->br_blockcount,
1603 PREV.br_blockcount - new->br_blockcount,
1604 oldext)))
1605 goto done;
1606 cur->bc_rec.b = *new;
1607 if ((error = xfs_bmbt_insert(cur, &i)))
1608 goto done;
1609 ASSERT(i == 1);
1610 }
1611 /* DELTA: One in-core extent is split in two. */
1612 temp = PREV.br_startoff;
1613 temp2 = PREV.br_blockcount;
1614 break;
1615
1616 case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
1617 /*
1618 * Setting the last part of a previous oldext extent to newext.
1619 * The right neighbor is contiguous with the new allocation.
1620 */
1621 XFS_BMAP_TRACE_PRE_UPDATE("RF|RC", ip, idx,
1622 XFS_DATA_FORK);
1623 XFS_BMAP_TRACE_PRE_UPDATE("RF|RC", ip, idx + 1,
1624 XFS_DATA_FORK);
1625 xfs_bmbt_set_blockcount(ep,
1626 PREV.br_blockcount - new->br_blockcount);
1627 XFS_BMAP_TRACE_POST_UPDATE("RF|RC", ip, idx,
1628 XFS_DATA_FORK);
1629 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, idx + 1),
1630 new->br_startoff, new->br_startblock,
1631 new->br_blockcount + RIGHT.br_blockcount, newext);
1632 XFS_BMAP_TRACE_POST_UPDATE("RF|RC", ip, idx + 1,
1633 XFS_DATA_FORK);
1634 ip->i_df.if_lastex = idx + 1;
1635 if (cur == NULL)
1636 rval = XFS_ILOG_DEXT;
1637 else {
1638 rval = 0;
1639 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1640 PREV.br_startblock,
1641 PREV.br_blockcount, &i)))
1642 goto done;
1643 ASSERT(i == 1);
1644 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1645 PREV.br_startblock,
1646 PREV.br_blockcount - new->br_blockcount,
1647 oldext)))
1648 goto done;
1649 if ((error = xfs_bmbt_increment(cur, 0, &i)))
1650 goto done;
1651 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1652 new->br_startblock,
1653 new->br_blockcount + RIGHT.br_blockcount,
1654 newext)))
1655 goto done;
1656 }
1657 /* DELTA: The boundary between two in-core extents moved. */
1658 temp = PREV.br_startoff;
1659 temp2 = PREV.br_blockcount +
1660 RIGHT.br_blockcount;
1661 break;
1662
1663 case MASK(RIGHT_FILLING):
1664 /*
1665 * Setting the last part of a previous oldext extent to newext.
1666 * The right neighbor is not contiguous.
1667 */
1668 XFS_BMAP_TRACE_PRE_UPDATE("RF", ip, idx, XFS_DATA_FORK);
1669 xfs_bmbt_set_blockcount(ep,
1670 PREV.br_blockcount - new->br_blockcount);
1671 XFS_BMAP_TRACE_POST_UPDATE("RF", ip, idx, XFS_DATA_FORK);
1672 XFS_BMAP_TRACE_INSERT("RF", ip, idx + 1, 1, new, NULL,
1673 XFS_DATA_FORK);
1674 xfs_iext_insert(ifp, idx + 1, 1, new);
1675 ip->i_df.if_lastex = idx + 1;
1676 ip->i_d.di_nextents++;
1677 if (cur == NULL)
1678 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1679 else {
1680 rval = XFS_ILOG_CORE;
1681 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1682 PREV.br_startblock, PREV.br_blockcount,
1683 &i)))
1684 goto done;
1685 ASSERT(i == 1);
1686 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1687 PREV.br_startblock,
1688 PREV.br_blockcount - new->br_blockcount,
1689 oldext)))
1690 goto done;
1691 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1692 new->br_startblock, new->br_blockcount,
1693 &i)))
1694 goto done;
1695 ASSERT(i == 0);
1696 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1697 if ((error = xfs_bmbt_insert(cur, &i)))
1698 goto done;
1699 ASSERT(i == 1);
1700 }
1701 /* DELTA: One in-core extent is split in two. */
1702 temp = PREV.br_startoff;
1703 temp2 = PREV.br_blockcount;
1704 break;
1705
1706 case 0:
1707 /*
1708 * Setting the middle part of a previous oldext extent to
1709 * newext. Contiguity is impossible here.
1710 * One extent becomes three extents.
1711 */
1712 XFS_BMAP_TRACE_PRE_UPDATE("0", ip, idx, XFS_DATA_FORK);
1713 xfs_bmbt_set_blockcount(ep,
1714 new->br_startoff - PREV.br_startoff);
1715 XFS_BMAP_TRACE_POST_UPDATE("0", ip, idx, XFS_DATA_FORK);
1716 r[0] = *new;
1717 r[1].br_startoff = new_endoff;
1718 r[1].br_blockcount =
1719 PREV.br_startoff + PREV.br_blockcount - new_endoff;
1720 r[1].br_startblock = new->br_startblock + new->br_blockcount;
1721 r[1].br_state = oldext;
1722 XFS_BMAP_TRACE_INSERT("0", ip, idx + 1, 2, &r[0], &r[1],
1723 XFS_DATA_FORK);
1724 xfs_iext_insert(ifp, idx + 1, 2, &r[0]);
1725 ip->i_df.if_lastex = idx + 1;
1726 ip->i_d.di_nextents += 2;
1727 if (cur == NULL)
1728 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1729 else {
1730 rval = XFS_ILOG_CORE;
1731 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1732 PREV.br_startblock, PREV.br_blockcount,
1733 &i)))
1734 goto done;
1735 ASSERT(i == 1);
1736 /* new right extent - oldext */
1737 if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
1738 r[1].br_startblock, r[1].br_blockcount,
1739 r[1].br_state)))
1740 goto done;
1741 /* new left extent - oldext */
1742 PREV.br_blockcount =
1743 new->br_startoff - PREV.br_startoff;
1744 cur->bc_rec.b = PREV;
1745 if ((error = xfs_bmbt_insert(cur, &i)))
1746 goto done;
1747 ASSERT(i == 1);
1748 if ((error = xfs_bmbt_increment(cur, 0, &i)))
1749 goto done;
1750 ASSERT(i == 1);
1751 /* new middle extent - newext */
1752 cur->bc_rec.b = *new;
1753 if ((error = xfs_bmbt_insert(cur, &i)))
1754 goto done;
1755 ASSERT(i == 1);
1756 }
1757 /* DELTA: One in-core extent is split in three. */
1758 temp = PREV.br_startoff;
1759 temp2 = PREV.br_blockcount;
1760 break;
1761
1762 case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1763 case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1764 case MASK2(LEFT_FILLING, RIGHT_CONTIG):
1765 case MASK2(RIGHT_FILLING, LEFT_CONTIG):
1766 case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
1767 case MASK(LEFT_CONTIG):
1768 case MASK(RIGHT_CONTIG):
1769 /*
1770 * These cases are all impossible.
1771 */
1772 ASSERT(0);
1773 }
1774 *curp = cur;
1775 if (delta) {
1776 temp2 += temp;
1777 if (delta->xed_startoff > temp)
1778 delta->xed_startoff = temp;
1779 if (delta->xed_blockcount < temp2)
1780 delta->xed_blockcount = temp2;
1781 }
1782 done:
1783 *logflagsp = rval;
1784 return error;
1785 #undef LEFT
1786 #undef RIGHT
1787 #undef PREV
1788 #undef MASK
1789 #undef MASK2
1790 #undef MASK3
1791 #undef MASK4
1792 #undef STATE_SET
1793 #undef STATE_TEST
1794 #undef STATE_SET_TEST
1795 #undef SWITCH_STATE
1796 }
1797
1798 /*
1799 * Called by xfs_bmap_add_extent to handle cases converting a hole
1800 * to a delayed allocation.
1801 */
1802 /*ARGSUSED*/
1803 STATIC int /* error */
1804 xfs_bmap_add_extent_hole_delay(
1805 xfs_inode_t *ip, /* incore inode pointer */
1806 xfs_extnum_t idx, /* extent number to update/insert */
1807 xfs_bmbt_irec_t *new, /* new data to add to file extents */
1808 int *logflagsp, /* inode logging flags */
1809 xfs_extdelta_t *delta, /* Change made to incore extents */
1810 int rsvd) /* OK to allocate reserved blocks */
1811 {
1812 xfs_bmbt_rec_host_t *ep; /* extent record for idx */
1813 xfs_ifork_t *ifp; /* inode fork pointer */
1814 xfs_bmbt_irec_t left; /* left neighbor extent entry */
1815 xfs_filblks_t newlen=0; /* new indirect size */
1816 xfs_filblks_t oldlen=0; /* old indirect size */
1817 xfs_bmbt_irec_t right; /* right neighbor extent entry */
1818 int state; /* state bits, accessed thru macros */
1819 xfs_filblks_t temp=0; /* temp for indirect calculations */
1820 xfs_filblks_t temp2=0;
1821 enum { /* bit number definitions for state */
1822 LEFT_CONTIG, RIGHT_CONTIG,
1823 LEFT_DELAY, RIGHT_DELAY,
1824 LEFT_VALID, RIGHT_VALID
1825 };
1826
1827 #define MASK(b) (1 << (b))
1828 #define MASK2(a,b) (MASK(a) | MASK(b))
1829 #define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
1830 #define STATE_TEST(b) (state & MASK(b))
1831 #define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
1832 ((state &= ~MASK(b)), 0))
1833 #define SWITCH_STATE (state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
1834
1835 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1836 ep = xfs_iext_get_ext(ifp, idx);
1837 state = 0;
1838 ASSERT(ISNULLSTARTBLOCK(new->br_startblock));
1839 /*
1840 * Check and set flags if this segment has a left neighbor
1841 */
1842 if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
1843 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &left);
1844 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
1845 }
1846 /*
1847 * Check and set flags if the current (right) segment exists.
1848 * If it doesn't exist, we're converting the hole at end-of-file.
1849 */
1850 if (STATE_SET_TEST(RIGHT_VALID,
1851 idx <
1852 ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
1853 xfs_bmbt_get_all(ep, &right);
1854 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
1855 }
1856 /*
1857 * Set contiguity flags on the left and right neighbors.
1858 * Don't let extents get too large, even if the pieces are contiguous.
1859 */
1860 STATE_SET(LEFT_CONTIG,
1861 STATE_TEST(LEFT_VALID) && STATE_TEST(LEFT_DELAY) &&
1862 left.br_startoff + left.br_blockcount == new->br_startoff &&
1863 left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
1864 STATE_SET(RIGHT_CONTIG,
1865 STATE_TEST(RIGHT_VALID) && STATE_TEST(RIGHT_DELAY) &&
1866 new->br_startoff + new->br_blockcount == right.br_startoff &&
1867 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
1868 (!STATE_TEST(LEFT_CONTIG) ||
1869 (left.br_blockcount + new->br_blockcount +
1870 right.br_blockcount <= MAXEXTLEN)));
1871 /*
1872 * Switch out based on the contiguity flags.
1873 */
1874 switch (SWITCH_STATE) {
1875
1876 case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
1877 /*
1878 * New allocation is contiguous with delayed allocations
1879 * on the left and on the right.
1880 * Merge all three into a single extent record.
1881 */
1882 temp = left.br_blockcount + new->br_blockcount +
1883 right.br_blockcount;
1884 XFS_BMAP_TRACE_PRE_UPDATE("LC|RC", ip, idx - 1,
1885 XFS_DATA_FORK);
1886 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1), temp);
1887 oldlen = STARTBLOCKVAL(left.br_startblock) +
1888 STARTBLOCKVAL(new->br_startblock) +
1889 STARTBLOCKVAL(right.br_startblock);
1890 newlen = xfs_bmap_worst_indlen(ip, temp);
1891 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, idx - 1),
1892 NULLSTARTBLOCK((int)newlen));
1893 XFS_BMAP_TRACE_POST_UPDATE("LC|RC", ip, idx - 1,
1894 XFS_DATA_FORK);
1895 XFS_BMAP_TRACE_DELETE("LC|RC", ip, idx, 1, XFS_DATA_FORK);
1896 xfs_iext_remove(ifp, idx, 1);
1897 ip->i_df.if_lastex = idx - 1;
1898 /* DELTA: Two in-core extents were replaced by one. */
1899 temp2 = temp;
1900 temp = left.br_startoff;
1901 break;
1902
1903 case MASK(LEFT_CONTIG):
1904 /*
1905 * New allocation is contiguous with a delayed allocation
1906 * on the left.
1907 * Merge the new allocation with the left neighbor.
1908 */
1909 temp = left.br_blockcount + new->br_blockcount;
1910 XFS_BMAP_TRACE_PRE_UPDATE("LC", ip, idx - 1,
1911 XFS_DATA_FORK);
1912 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1), temp);
1913 oldlen = STARTBLOCKVAL(left.br_startblock) +
1914 STARTBLOCKVAL(new->br_startblock);
1915 newlen = xfs_bmap_worst_indlen(ip, temp);
1916 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, idx - 1),
1917 NULLSTARTBLOCK((int)newlen));
1918 XFS_BMAP_TRACE_POST_UPDATE("LC", ip, idx - 1,
1919 XFS_DATA_FORK);
1920 ip->i_df.if_lastex = idx - 1;
1921 /* DELTA: One in-core extent grew into a hole. */
1922 temp2 = temp;
1923 temp = left.br_startoff;
1924 break;
1925
1926 case MASK(RIGHT_CONTIG):
1927 /*
1928 * New allocation is contiguous with a delayed allocation
1929 * on the right.
1930 * Merge the new allocation with the right neighbor.
1931 */
1932 XFS_BMAP_TRACE_PRE_UPDATE("RC", ip, idx, XFS_DATA_FORK);
1933 temp = new->br_blockcount + right.br_blockcount;
1934 oldlen = STARTBLOCKVAL(new->br_startblock) +
1935 STARTBLOCKVAL(right.br_startblock);
1936 newlen = xfs_bmap_worst_indlen(ip, temp);
1937 xfs_bmbt_set_allf(ep, new->br_startoff,
1938 NULLSTARTBLOCK((int)newlen), temp, right.br_state);
1939 XFS_BMAP_TRACE_POST_UPDATE("RC", ip, idx, XFS_DATA_FORK);
1940 ip->i_df.if_lastex = idx;
1941 /* DELTA: One in-core extent grew into a hole. */
1942 temp2 = temp;
1943 temp = new->br_startoff;
1944 break;
1945
1946 case 0:
1947 /*
1948 * New allocation is not contiguous with another
1949 * delayed allocation.
1950 * Insert a new entry.
1951 */
1952 oldlen = newlen = 0;
1953 XFS_BMAP_TRACE_INSERT("0", ip, idx, 1, new, NULL,
1954 XFS_DATA_FORK);
1955 xfs_iext_insert(ifp, idx, 1, new);
1956 ip->i_df.if_lastex = idx;
1957 /* DELTA: A new in-core extent was added in a hole. */
1958 temp2 = new->br_blockcount;
1959 temp = new->br_startoff;
1960 break;
1961 }
1962 if (oldlen != newlen) {
1963 ASSERT(oldlen > newlen);
1964 xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
1965 (int64_t)(oldlen - newlen), rsvd);
1966 /*
1967 * Nothing to do for disk quota accounting here.
1968 */
1969 }
1970 if (delta) {
1971 temp2 += temp;
1972 if (delta->xed_startoff > temp)
1973 delta->xed_startoff = temp;
1974 if (delta->xed_blockcount < temp2)
1975 delta->xed_blockcount = temp2;
1976 }
1977 *logflagsp = 0;
1978 return 0;
1979 #undef MASK
1980 #undef MASK2
1981 #undef STATE_SET
1982 #undef STATE_TEST
1983 #undef STATE_SET_TEST
1984 #undef SWITCH_STATE
1985 }
1986
1987 /*
1988 * Called by xfs_bmap_add_extent to handle cases converting a hole
1989 * to a real allocation.
1990 */
1991 STATIC int /* error */
1992 xfs_bmap_add_extent_hole_real(
1993 xfs_inode_t *ip, /* incore inode pointer */
1994 xfs_extnum_t idx, /* extent number to update/insert */
1995 xfs_btree_cur_t *cur, /* if null, not a btree */
1996 xfs_bmbt_irec_t *new, /* new data to add to file extents */
1997 int *logflagsp, /* inode logging flags */
1998 xfs_extdelta_t *delta, /* Change made to incore extents */
1999 int whichfork) /* data or attr fork */
2000 {
2001 xfs_bmbt_rec_host_t *ep; /* pointer to extent entry ins. point */
2002 int error; /* error return value */
2003 int i; /* temp state */
2004 xfs_ifork_t *ifp; /* inode fork pointer */
2005 xfs_bmbt_irec_t left; /* left neighbor extent entry */
2006 xfs_bmbt_irec_t right; /* right neighbor extent entry */
2007 int rval=0; /* return value (logging flags) */
2008 int state; /* state bits, accessed thru macros */
2009 xfs_filblks_t temp=0;
2010 xfs_filblks_t temp2=0;
2011 enum { /* bit number definitions for state */
2012 LEFT_CONTIG, RIGHT_CONTIG,
2013 LEFT_DELAY, RIGHT_DELAY,
2014 LEFT_VALID, RIGHT_VALID
2015 };
2016
2017 #define MASK(b) (1 << (b))
2018 #define MASK2(a,b) (MASK(a) | MASK(b))
2019 #define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
2020 #define STATE_TEST(b) (state & MASK(b))
2021 #define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
2022 ((state &= ~MASK(b)), 0))
2023 #define SWITCH_STATE (state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
2024
2025 ifp = XFS_IFORK_PTR(ip, whichfork);
2026 ASSERT(idx <= ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
2027 ep = xfs_iext_get_ext(ifp, idx);
2028 state = 0;
2029 /*
2030 * Check and set flags if this segment has a left neighbor.
2031 */
2032 if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
2033 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &left);
2034 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
2035 }
2036 /*
2037 * Check and set flags if this segment has a current value.
2038 * Not true if we're inserting into the "hole" at eof.
2039 */
2040 if (STATE_SET_TEST(RIGHT_VALID,
2041 idx <
2042 ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
2043 xfs_bmbt_get_all(ep, &right);
2044 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
2045 }
2046 /*
2047 * We're inserting a real allocation between "left" and "right".
2048 * Set the contiguity flags. Don't let extents get too large.
2049 */
2050 STATE_SET(LEFT_CONTIG,
2051 STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
2052 left.br_startoff + left.br_blockcount == new->br_startoff &&
2053 left.br_startblock + left.br_blockcount == new->br_startblock &&
2054 left.br_state == new->br_state &&
2055 left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
2056 STATE_SET(RIGHT_CONTIG,
2057 STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
2058 new->br_startoff + new->br_blockcount == right.br_startoff &&
2059 new->br_startblock + new->br_blockcount ==
2060 right.br_startblock &&
2061 new->br_state == right.br_state &&
2062 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
2063 (!STATE_TEST(LEFT_CONTIG) ||
2064 left.br_blockcount + new->br_blockcount +
2065 right.br_blockcount <= MAXEXTLEN));
2066
2067 error = 0;
2068 /*
2069 * Select which case we're in here, and implement it.
2070 */
2071 switch (SWITCH_STATE) {
2072
2073 case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
2074 /*
2075 * New allocation is contiguous with real allocations on the
2076 * left and on the right.
2077 * Merge all three into a single extent record.
2078 */
2079 XFS_BMAP_TRACE_PRE_UPDATE("LC|RC", ip, idx - 1,
2080 whichfork);
2081 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
2082 left.br_blockcount + new->br_blockcount +
2083 right.br_blockcount);
2084 XFS_BMAP_TRACE_POST_UPDATE("LC|RC", ip, idx - 1,
2085 whichfork);
2086 XFS_BMAP_TRACE_DELETE("LC|RC", ip, idx, 1, whichfork);
2087 xfs_iext_remove(ifp, idx, 1);
2088 ifp->if_lastex = idx - 1;
2089 XFS_IFORK_NEXT_SET(ip, whichfork,
2090 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
2091 if (cur == NULL) {
2092 rval = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
2093 } else {
2094 rval = XFS_ILOG_CORE;
2095 if ((error = xfs_bmbt_lookup_eq(cur,
2096 right.br_startoff,
2097 right.br_startblock,
2098 right.br_blockcount, &i)))
2099 goto done;
2100 ASSERT(i == 1);
2101 if ((error = xfs_bmbt_delete(cur, &i)))
2102 goto done;
2103 ASSERT(i == 1);
2104 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
2105 goto done;
2106 ASSERT(i == 1);
2107 if ((error = xfs_bmbt_update(cur, left.br_startoff,
2108 left.br_startblock,
2109 left.br_blockcount +
2110 new->br_blockcount +
2111 right.br_blockcount,
2112 left.br_state)))
2113 goto done;
2114 }
2115 /* DELTA: Two in-core extents were replaced by one. */
2116 temp = left.br_startoff;
2117 temp2 = left.br_blockcount +
2118 new->br_blockcount +
2119 right.br_blockcount;
2120 break;
2121
2122 case MASK(LEFT_CONTIG):
2123 /*
2124 * New allocation is contiguous with a real allocation
2125 * on the left.
2126 * Merge the new allocation with the left neighbor.
2127 */
2128 XFS_BMAP_TRACE_PRE_UPDATE("LC", ip, idx - 1, whichfork);
2129 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
2130 left.br_blockcount + new->br_blockcount);
2131 XFS_BMAP_TRACE_POST_UPDATE("LC", ip, idx - 1, whichfork);
2132 ifp->if_lastex = idx - 1;
2133 if (cur == NULL) {
2134 rval = XFS_ILOG_FEXT(whichfork);
2135 } else {
2136 rval = 0;
2137 if ((error = xfs_bmbt_lookup_eq(cur,
2138 left.br_startoff,
2139 left.br_startblock,
2140 left.br_blockcount, &i)))
2141 goto done;
2142 ASSERT(i == 1);
2143 if ((error = xfs_bmbt_update(cur, left.br_startoff,
2144 left.br_startblock,
2145 left.br_blockcount +
2146 new->br_blockcount,
2147 left.br_state)))
2148 goto done;
2149 }
2150 /* DELTA: One in-core extent grew. */
2151 temp = left.br_startoff;
2152 temp2 = left.br_blockcount +
2153 new->br_blockcount;
2154 break;
2155
2156 case MASK(RIGHT_CONTIG):
2157 /*
2158 * New allocation is contiguous with a real allocation
2159 * on the right.
2160 * Merge the new allocation with the right neighbor.
2161 */
2162 XFS_BMAP_TRACE_PRE_UPDATE("RC", ip, idx, whichfork);
2163 xfs_bmbt_set_allf(ep, new->br_startoff, new->br_startblock,
2164 new->br_blockcount + right.br_blockcount,
2165 right.br_state);
2166 XFS_BMAP_TRACE_POST_UPDATE("RC", ip, idx, whichfork);
2167 ifp->if_lastex = idx;
2168 if (cur == NULL) {
2169 rval = XFS_ILOG_FEXT(whichfork);
2170 } else {
2171 rval = 0;
2172 if ((error = xfs_bmbt_lookup_eq(cur,
2173 right.br_startoff,
2174 right.br_startblock,
2175 right.br_blockcount, &i)))
2176 goto done;
2177 ASSERT(i == 1);
2178 if ((error = xfs_bmbt_update(cur, new->br_startoff,
2179 new->br_startblock,
2180 new->br_blockcount +
2181 right.br_blockcount,
2182 right.br_state)))
2183 goto done;
2184 }
2185 /* DELTA: One in-core extent grew. */
2186 temp = new->br_startoff;
2187 temp2 = new->br_blockcount +
2188 right.br_blockcount;
2189 break;
2190
2191 case 0:
2192 /*
2193 * New allocation is not contiguous with another
2194 * real allocation.
2195 * Insert a new entry.
2196 */
2197 XFS_BMAP_TRACE_INSERT("0", ip, idx, 1, new, NULL, whichfork);
2198 xfs_iext_insert(ifp, idx, 1, new);
2199 ifp->if_lastex = idx;
2200 XFS_IFORK_NEXT_SET(ip, whichfork,
2201 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
2202 if (cur == NULL) {
2203 rval = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
2204 } else {
2205 rval = XFS_ILOG_CORE;
2206 if ((error = xfs_bmbt_lookup_eq(cur,
2207 new->br_startoff,
2208 new->br_startblock,
2209 new->br_blockcount, &i)))
2210 goto done;
2211 ASSERT(i == 0);
2212 cur->bc_rec.b.br_state = new->br_state;
2213 if ((error = xfs_bmbt_insert(cur, &i)))
2214 goto done;
2215 ASSERT(i == 1);
2216 }
2217 /* DELTA: A new extent was added in a hole. */
2218 temp = new->br_startoff;
2219 temp2 = new->br_blockcount;
2220 break;
2221 }
2222 if (delta) {
2223 temp2 += temp;
2224 if (delta->xed_startoff > temp)
2225 delta->xed_startoff = temp;
2226 if (delta->xed_blockcount < temp2)
2227 delta->xed_blockcount = temp2;
2228 }
2229 done:
2230 *logflagsp = rval;
2231 return error;
2232 #undef MASK
2233 #undef MASK2
2234 #undef STATE_SET
2235 #undef STATE_TEST
2236 #undef STATE_SET_TEST
2237 #undef SWITCH_STATE
2238 }
2239
2240 /*
2241 * Adjust the size of the new extent based on di_extsize and rt extsize.
2242 */
2243 STATIC int
2244 xfs_bmap_extsize_align(
2245 xfs_mount_t *mp,
2246 xfs_bmbt_irec_t *gotp, /* next extent pointer */
2247 xfs_bmbt_irec_t *prevp, /* previous extent pointer */
2248 xfs_extlen_t extsz, /* align to this extent size */
2249 int rt, /* is this a realtime inode? */
2250 int eof, /* is extent at end-of-file? */
2251 int delay, /* creating delalloc extent? */
2252 int convert, /* overwriting unwritten extent? */
2253 xfs_fileoff_t *offp, /* in/out: aligned offset */
2254 xfs_extlen_t *lenp) /* in/out: aligned length */
2255 {
2256 xfs_fileoff_t orig_off; /* original offset */
2257 xfs_extlen_t orig_alen; /* original length */
2258 xfs_fileoff_t orig_end; /* original off+len */
2259 xfs_fileoff_t nexto; /* next file offset */
2260 xfs_fileoff_t prevo; /* previous file offset */
2261 xfs_fileoff_t align_off; /* temp for offset */
2262 xfs_extlen_t align_alen; /* temp for length */
2263 xfs_extlen_t temp; /* temp for calculations */
2264
2265 if (convert)
2266 return 0;
2267
2268 orig_off = align_off = *offp;
2269 orig_alen = align_alen = *lenp;
2270 orig_end = orig_off + orig_alen;
2271
2272 /*
2273 * If this request overlaps an existing extent, then don't
2274 * attempt to perform any additional alignment.
2275 */
2276 if (!delay && !eof &&
2277 (orig_off >= gotp->br_startoff) &&
2278 (orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
2279 return 0;
2280 }
2281
2282 /*
2283 * If the file offset is unaligned vs. the extent size
2284 * we need to align it. This will be possible unless
2285 * the file was previously written with a kernel that didn't
2286 * perform this alignment, or if a truncate shot us in the
2287 * foot.
2288 */
2289 temp = do_mod(orig_off, extsz);
2290 if (temp) {
2291 align_alen += temp;
2292 align_off -= temp;
2293 }
2294 /*
2295 * Same adjustment for the end of the requested area.
2296 */
2297 if ((temp = (align_alen % extsz))) {
2298 align_alen += extsz - temp;
2299 }
2300 /*
2301 * If the previous block overlaps with this proposed allocation
2302 * then move the start forward without adjusting the length.
2303 */
2304 if (prevp->br_startoff != NULLFILEOFF) {
2305 if (prevp->br_startblock == HOLESTARTBLOCK)
2306 prevo = prevp->br_startoff;
2307 else
2308 prevo = prevp->br_startoff + prevp->br_blockcount;
2309 } else
2310 prevo = 0;
2311 if (align_off != orig_off && align_off < prevo)
2312 align_off = prevo;
2313 /*
2314 * If the next block overlaps with this proposed allocation
2315 * then move the start back without adjusting the length,
2316 * but not before offset 0.
2317 * This may of course make the start overlap previous block,
2318 * and if we hit the offset 0 limit then the next block
2319 * can still overlap too.
2320 */
2321 if (!eof && gotp->br_startoff != NULLFILEOFF) {
2322 if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
2323 (!delay && gotp->br_startblock == DELAYSTARTBLOCK))
2324 nexto = gotp->br_startoff + gotp->br_blockcount;
2325 else
2326 nexto = gotp->br_startoff;
2327 } else
2328 nexto = NULLFILEOFF;
2329 if (!eof &&
2330 align_off + align_alen != orig_end &&
2331 align_off + align_alen > nexto)
2332 align_off = nexto > align_alen ? nexto - align_alen : 0;
2333 /*
2334 * If we're now overlapping the next or previous extent that
2335 * means we can't fit an extsz piece in this hole. Just move
2336 * the start forward to the first valid spot and set
2337 * the length so we hit the end.
2338 */
2339 if (align_off != orig_off && align_off < prevo)
2340 align_off = prevo;
2341 if (align_off + align_alen != orig_end &&
2342 align_off + align_alen > nexto &&
2343 nexto != NULLFILEOFF) {
2344 ASSERT(nexto > prevo);
2345 align_alen = nexto - align_off;
2346 }
2347
2348 /*
2349 * If realtime, and the result isn't a multiple of the realtime
2350 * extent size we need to remove blocks until it is.
2351 */
2352 if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
2353 /*
2354 * We're not covering the original request, or
2355 * we won't be able to once we fix the length.
2356 */
2357 if (orig_off < align_off ||
2358 orig_end > align_off + align_alen ||
2359 align_alen - temp < orig_alen)
2360 return XFS_ERROR(EINVAL);
2361 /*
2362 * Try to fix it by moving the start up.
2363 */
2364 if (align_off + temp <= orig_off) {
2365 align_alen -= temp;
2366 align_off += temp;
2367 }
2368 /*
2369 * Try to fix it by moving the end in.
2370 */
2371 else if (align_off + align_alen - temp >= orig_end)
2372 align_alen -= temp;
2373 /*
2374 * Set the start to the minimum then trim the length.
2375 */
2376 else {
2377 align_alen -= orig_off - align_off;
2378 align_off = orig_off;
2379 align_alen -= align_alen % mp->m_sb.sb_rextsize;
2380 }
2381 /*
2382 * Result doesn't cover the request, fail it.
2383 */
2384 if (orig_off < align_off || orig_end > align_off + align_alen)
2385 return XFS_ERROR(EINVAL);
2386 } else {
2387 ASSERT(orig_off >= align_off);
2388 ASSERT(orig_end <= align_off + align_alen);
2389 }
2390
2391 #ifdef DEBUG
2392 if (!eof && gotp->br_startoff != NULLFILEOFF)
2393 ASSERT(align_off + align_alen <= gotp->br_startoff);
2394 if (prevp->br_startoff != NULLFILEOFF)
2395 ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
2396 #endif
2397
2398 *lenp = align_alen;
2399 *offp = align_off;
2400 return 0;
2401 }
2402
2403 #define XFS_ALLOC_GAP_UNITS 4
2404
2405 STATIC int
2406 xfs_bmap_adjacent(
2407 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2408 {
2409 xfs_fsblock_t adjust; /* adjustment to block numbers */
2410 xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
2411 xfs_mount_t *mp; /* mount point structure */
2412 int nullfb; /* true if ap->firstblock isn't set */
2413 int rt; /* true if inode is realtime */
2414
2415 #define ISVALID(x,y) \
2416 (rt ? \
2417 (x) < mp->m_sb.sb_rblocks : \
2418 XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
2419 XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
2420 XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
2421
2422 mp = ap->ip->i_mount;
2423 nullfb = ap->firstblock == NULLFSBLOCK;
2424 rt = XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata;
2425 fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
2426 /*
2427 * If allocating at eof, and there's a previous real block,
2428 * try to use it's last block as our starting point.
2429 */
2430 if (ap->eof && ap->prevp->br_startoff != NULLFILEOFF &&
2431 !ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
2432 ISVALID(ap->prevp->br_startblock + ap->prevp->br_blockcount,
2433 ap->prevp->br_startblock)) {
2434 ap->rval = ap->prevp->br_startblock + ap->prevp->br_blockcount;
2435 /*
2436 * Adjust for the gap between prevp and us.
2437 */
2438 adjust = ap->off -
2439 (ap->prevp->br_startoff + ap->prevp->br_blockcount);
2440 if (adjust &&
2441 ISVALID(ap->rval + adjust, ap->prevp->br_startblock))
2442 ap->rval += adjust;
2443 }
2444 /*
2445 * If not at eof, then compare the two neighbor blocks.
2446 * Figure out whether either one gives us a good starting point,
2447 * and pick the better one.
2448 */
2449 else if (!ap->eof) {
2450 xfs_fsblock_t gotbno; /* right side block number */
2451 xfs_fsblock_t gotdiff=0; /* right side difference */
2452 xfs_fsblock_t prevbno; /* left side block number */
2453 xfs_fsblock_t prevdiff=0; /* left side difference */
2454
2455 /*
2456 * If there's a previous (left) block, select a requested
2457 * start block based on it.
2458 */
2459 if (ap->prevp->br_startoff != NULLFILEOFF &&
2460 !ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
2461 (prevbno = ap->prevp->br_startblock +
2462 ap->prevp->br_blockcount) &&
2463 ISVALID(prevbno, ap->prevp->br_startblock)) {
2464 /*
2465 * Calculate gap to end of previous block.
2466 */
2467 adjust = prevdiff = ap->off -
2468 (ap->prevp->br_startoff +
2469 ap->prevp->br_blockcount);
2470 /*
2471 * Figure the startblock based on the previous block's
2472 * end and the gap size.
2473 * Heuristic!
2474 * If the gap is large relative to the piece we're
2475 * allocating, or using it gives us an invalid block
2476 * number, then just use the end of the previous block.
2477 */
2478 if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
2479 ISVALID(prevbno + prevdiff,
2480 ap->prevp->br_startblock))
2481 prevbno += adjust;
2482 else
2483 prevdiff += adjust;
2484 /*
2485 * If the firstblock forbids it, can't use it,
2486 * must use default.
2487 */
2488 if (!rt && !nullfb &&
2489 XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
2490 prevbno = NULLFSBLOCK;
2491 }
2492 /*
2493 * No previous block or can't follow it, just default.
2494 */
2495 else
2496 prevbno = NULLFSBLOCK;
2497 /*
2498 * If there's a following (right) block, select a requested
2499 * start block based on it.
2500 */
2501 if (!ISNULLSTARTBLOCK(ap->gotp->br_startblock)) {
2502 /*
2503 * Calculate gap to start of next block.
2504 */
2505 adjust = gotdiff = ap->gotp->br_startoff - ap->off;
2506 /*
2507 * Figure the startblock based on the next block's
2508 * start and the gap size.
2509 */
2510 gotbno = ap->gotp->br_startblock;
2511 /*
2512 * Heuristic!
2513 * If the gap is large relative to the piece we're
2514 * allocating, or using it gives us an invalid block
2515 * number, then just use the start of the next block
2516 * offset by our length.
2517 */
2518 if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
2519 ISVALID(gotbno - gotdiff, gotbno))
2520 gotbno -= adjust;
2521 else if (ISVALID(gotbno - ap->alen, gotbno)) {
2522 gotbno -= ap->alen;
2523 gotdiff += adjust - ap->alen;
2524 } else
2525 gotdiff += adjust;
2526 /*
2527 * If the firstblock forbids it, can't use it,
2528 * must use default.
2529 */
2530 if (!rt && !nullfb &&
2531 XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
2532 gotbno = NULLFSBLOCK;
2533 }
2534 /*
2535 * No next block, just default.
2536 */
2537 else
2538 gotbno = NULLFSBLOCK;
2539 /*
2540 * If both valid, pick the better one, else the only good
2541 * one, else ap->rval is already set (to 0 or the inode block).
2542 */
2543 if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
2544 ap->rval = prevdiff <= gotdiff ? prevbno : gotbno;
2545 else if (prevbno != NULLFSBLOCK)
2546 ap->rval = prevbno;
2547 else if (gotbno != NULLFSBLOCK)
2548 ap->rval = gotbno;
2549 }
2550 #undef ISVALID
2551 return 0;
2552 }
2553
2554 STATIC int
2555 xfs_bmap_rtalloc(
2556 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2557 {
2558 xfs_alloctype_t atype = 0; /* type for allocation routines */
2559 int error; /* error return value */
2560 xfs_mount_t *mp; /* mount point structure */
2561 xfs_extlen_t prod = 0; /* product factor for allocators */
2562 xfs_extlen_t ralen = 0; /* realtime allocation length */
2563 xfs_extlen_t align; /* minimum allocation alignment */
2564 xfs_rtblock_t rtb;
2565
2566 mp = ap->ip->i_mount;
2567 align = xfs_get_extsz_hint(ap->ip);
2568 prod = align / mp->m_sb.sb_rextsize;
2569 error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
2570 align, 1, ap->eof, 0,
2571 ap->conv, &ap->off, &ap->alen);
2572 if (error)
2573 return error;
2574 ASSERT(ap->alen);
2575 ASSERT(ap->alen % mp->m_sb.sb_rextsize == 0);
2576
2577 /*
2578 * If the offset & length are not perfectly aligned
2579 * then kill prod, it will just get us in trouble.
2580 */
2581 if (do_mod(ap->off, align) || ap->alen % align)
2582 prod = 1;
2583 /*
2584 * Set ralen to be the actual requested length in rtextents.
2585 */
2586 ralen = ap->alen / mp->m_sb.sb_rextsize;
2587 /*
2588 * If the old value was close enough to MAXEXTLEN that
2589 * we rounded up to it, cut it back so it's valid again.
2590 * Note that if it's a really large request (bigger than
2591 * MAXEXTLEN), we don't hear about that number, and can't
2592 * adjust the starting point to match it.
2593 */
2594 if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
2595 ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
2596 /*
2597 * If it's an allocation to an empty file at offset 0,
2598 * pick an extent that will space things out in the rt area.
2599 */
2600 if (ap->eof && ap->off == 0) {
2601 xfs_rtblock_t uninitialized_var(rtx); /* realtime extent no */
2602
2603 error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
2604 if (error)
2605 return error;
2606 ap->rval = rtx * mp->m_sb.sb_rextsize;
2607 } else {
2608 ap->rval = 0;
2609 }
2610
2611 xfs_bmap_adjacent(ap);
2612
2613 /*
2614 * Realtime allocation, done through xfs_rtallocate_extent.
2615 */
2616 atype = ap->rval == 0 ? XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
2617 do_div(ap->rval, mp->m_sb.sb_rextsize);
2618 rtb = ap->rval;
2619 ap->alen = ralen;
2620 if ((error = xfs_rtallocate_extent(ap->tp, ap->rval, 1, ap->alen,
2621 &ralen, atype, ap->wasdel, prod, &rtb)))
2622 return error;
2623 if (rtb == NULLFSBLOCK && prod > 1 &&
2624 (error = xfs_rtallocate_extent(ap->tp, ap->rval, 1,
2625 ap->alen, &ralen, atype,
2626 ap->wasdel, 1, &rtb)))
2627 return error;
2628 ap->rval = rtb;
2629 if (ap->rval != NULLFSBLOCK) {
2630 ap->rval *= mp->m_sb.sb_rextsize;
2631 ralen *= mp->m_sb.sb_rextsize;
2632 ap->alen = ralen;
2633 ap->ip->i_d.di_nblocks += ralen;
2634 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2635 if (ap->wasdel)
2636 ap->ip->i_delayed_blks -= ralen;
2637 /*
2638 * Adjust the disk quota also. This was reserved
2639 * earlier.
2640 */
2641 XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
2642 ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
2643 XFS_TRANS_DQ_RTBCOUNT, (long) ralen);
2644 } else {
2645 ap->alen = 0;
2646 }
2647 return 0;
2648 }
2649
2650 STATIC int
2651 xfs_bmap_btalloc(
2652 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2653 {
2654 xfs_mount_t *mp; /* mount point structure */
2655 xfs_alloctype_t atype = 0; /* type for allocation routines */
2656 xfs_extlen_t align; /* minimum allocation alignment */
2657 xfs_agnumber_t ag;
2658 xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
2659 xfs_agnumber_t startag;
2660 xfs_alloc_arg_t args;
2661 xfs_extlen_t blen;
2662 xfs_extlen_t delta;
2663 xfs_extlen_t longest;
2664 xfs_extlen_t need;
2665 xfs_extlen_t nextminlen = 0;
2666 xfs_perag_t *pag;
2667 int nullfb; /* true if ap->firstblock isn't set */
2668 int isaligned;
2669 int notinit;
2670 int tryagain;
2671 int error;
2672
2673 mp = ap->ip->i_mount;
2674 align = ap->userdata ? xfs_get_extsz_hint(ap->ip) : 0;
2675 if (unlikely(align)) {
2676 error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
2677 align, 0, ap->eof, 0, ap->conv,
2678 &ap->off, &ap->alen);
2679 ASSERT(!error);
2680 ASSERT(ap->alen);
2681 }
2682 nullfb = ap->firstblock == NULLFSBLOCK;
2683 fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
2684 if (nullfb) {
2685 if (ap->userdata && xfs_inode_is_filestream(ap->ip)) {
2686 ag = xfs_filestream_lookup_ag(ap->ip);
2687 ag = (ag != NULLAGNUMBER) ? ag : 0;
2688 ap->rval = XFS_AGB_TO_FSB(mp, ag, 0);
2689 } else {
2690 ap->rval = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
2691 }
2692 } else
2693 ap->rval = ap->firstblock;
2694
2695 xfs_bmap_adjacent(ap);
2696
2697 /*
2698 * If allowed, use ap->rval; otherwise must use firstblock since
2699 * it's in the right allocation group.
2700 */
2701 if (nullfb || XFS_FSB_TO_AGNO(mp, ap->rval) == fb_agno)
2702 ;
2703 else
2704 ap->rval = ap->firstblock;
2705 /*
2706 * Normal allocation, done through xfs_alloc_vextent.
2707 */
2708 tryagain = isaligned = 0;
2709 args.tp = ap->tp;
2710 args.mp = mp;
2711 args.fsbno = ap->rval;
2712 args.maxlen = MIN(ap->alen, mp->m_sb.sb_agblocks);
2713 args.firstblock = ap->firstblock;
2714 blen = 0;
2715 if (nullfb) {
2716 if (ap->userdata && xfs_inode_is_filestream(ap->ip))
2717 args.type = XFS_ALLOCTYPE_NEAR_BNO;
2718 else
2719 args.type = XFS_ALLOCTYPE_START_BNO;
2720 args.total = ap->total;
2721
2722 /*
2723 * Search for an allocation group with a single extent
2724 * large enough for the request.
2725 *
2726 * If one isn't found, then adjust the minimum allocation
2727 * size to the largest space found.
2728 */
2729 startag = ag = XFS_FSB_TO_AGNO(mp, args.fsbno);
2730 if (startag == NULLAGNUMBER)
2731 startag = ag = 0;
2732 notinit = 0;
2733 down_read(&mp->m_peraglock);
2734 while (blen < ap->alen) {
2735 pag = &mp->m_perag[ag];
2736 if (!pag->pagf_init &&
2737 (error = xfs_alloc_pagf_init(mp, args.tp,
2738 ag, XFS_ALLOC_FLAG_TRYLOCK))) {
2739 up_read(&mp->m_peraglock);
2740 return error;
2741 }
2742 /*
2743 * See xfs_alloc_fix_freelist...
2744 */
2745 if (pag->pagf_init) {
2746 need = XFS_MIN_FREELIST_PAG(pag, mp);
2747 delta = need > pag->pagf_flcount ?
2748 need - pag->pagf_flcount : 0;
2749 longest = (pag->pagf_longest > delta) ?
2750 (pag->pagf_longest - delta) :
2751 (pag->pagf_flcount > 0 ||
2752 pag->pagf_longest > 0);
2753 if (blen < longest)
2754 blen = longest;
2755 } else
2756 notinit = 1;
2757
2758 if (xfs_inode_is_filestream(ap->ip)) {
2759 if (blen >= ap->alen)
2760 break;
2761
2762 if (ap->userdata) {
2763 /*
2764 * If startag is an invalid AG, we've
2765 * come here once before and
2766 * xfs_filestream_new_ag picked the
2767 * best currently available.
2768 *
2769 * Don't continue looping, since we
2770 * could loop forever.
2771 */
2772 if (startag == NULLAGNUMBER)
2773 break;
2774
2775 error = xfs_filestream_new_ag(ap, &ag);
2776 if (error) {
2777 up_read(&mp->m_peraglock);
2778 return error;
2779 }
2780
2781 /* loop again to set 'blen'*/
2782 startag = NULLAGNUMBER;
2783 continue;
2784 }
2785 }
2786 if (++ag == mp->m_sb.sb_agcount)
2787 ag = 0;
2788 if (ag == startag)
2789 break;
2790 }
2791 up_read(&mp->m_peraglock);
2792 /*
2793 * Since the above loop did a BUF_TRYLOCK, it is
2794 * possible that there is space for this request.
2795 */
2796 if (notinit || blen < ap->minlen)
2797 args.minlen = ap->minlen;
2798 /*
2799 * If the best seen length is less than the request
2800 * length, use the best as the minimum.
2801 */
2802 else if (blen < ap->alen)
2803 args.minlen = blen;
2804 /*
2805 * Otherwise we've seen an extent as big as alen,
2806 * use that as the minimum.
2807 */
2808 else
2809 args.minlen = ap->alen;
2810
2811 /*
2812 * set the failure fallback case to look in the selected
2813 * AG as the stream may have moved.
2814 */
2815 if (xfs_inode_is_filestream(ap->ip))
2816 ap->rval = args.fsbno = XFS_AGB_TO_FSB(mp, ag, 0);
2817 } else if (ap->low) {
2818 if (xfs_inode_is_filestream(ap->ip))
2819 args.type = XFS_ALLOCTYPE_FIRST_AG;
2820 else
2821 args.type = XFS_ALLOCTYPE_START_BNO;
2822 args.total = args.minlen = ap->minlen;
2823 } else {
2824 args.type = XFS_ALLOCTYPE_NEAR_BNO;
2825 args.total = ap->total;
2826 args.minlen = ap->minlen;
2827 }
2828 /* apply extent size hints if obtained earlier */
2829 if (unlikely(align)) {
2830 args.prod = align;
2831 if ((args.mod = (xfs_extlen_t)do_mod(ap->off, args.prod)))
2832 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2833 } else if (mp->m_sb.sb_blocksize >= PAGE_CACHE_SIZE) {
2834 args.prod = 1;
2835 args.mod = 0;
2836 } else {
2837 args.prod = PAGE_CACHE_SIZE >> mp->m_sb.sb_blocklog;
2838 if ((args.mod = (xfs_extlen_t)(do_mod(ap->off, args.prod))))
2839 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2840 }
2841 /*
2842 * If we are not low on available data blocks, and the
2843 * underlying logical volume manager is a stripe, and
2844 * the file offset is zero then try to allocate data
2845 * blocks on stripe unit boundary.
2846 * NOTE: ap->aeof is only set if the allocation length
2847 * is >= the stripe unit and the allocation offset is
2848 * at the end of file.
2849 */
2850 if (!ap->low && ap->aeof) {
2851 if (!ap->off) {
2852 args.alignment = mp->m_dalign;
2853 atype = args.type;
2854 isaligned = 1;
2855 /*
2856 * Adjust for alignment
2857 */
2858 if (blen > args.alignment && blen <= ap->alen)
2859 args.minlen = blen - args.alignment;
2860 args.minalignslop = 0;
2861 } else {
2862 /*
2863 * First try an exact bno allocation.
2864 * If it fails then do a near or start bno
2865 * allocation with alignment turned on.
2866 */
2867 atype = args.type;
2868 tryagain = 1;
2869 args.type = XFS_ALLOCTYPE_THIS_BNO;
2870 args.alignment = 1;
2871 /*
2872 * Compute the minlen+alignment for the
2873 * next case. Set slop so that the value
2874 * of minlen+alignment+slop doesn't go up
2875 * between the calls.
2876 */
2877 if (blen > mp->m_dalign && blen <= ap->alen)
2878 nextminlen = blen - mp->m_dalign;
2879 else
2880 nextminlen = args.minlen;
2881 if (nextminlen + mp->m_dalign > args.minlen + 1)
2882 args.minalignslop =
2883 nextminlen + mp->m_dalign -
2884 args.minlen - 1;
2885 else
2886 args.minalignslop = 0;
2887 }
2888 } else {
2889 args.alignment = 1;
2890 args.minalignslop = 0;
2891 }
2892 args.minleft = ap->minleft;
2893 args.wasdel = ap->wasdel;
2894 args.isfl = 0;
2895 args.userdata = ap->userdata;
2896 if ((error = xfs_alloc_vextent(&args)))
2897 return error;
2898 if (tryagain && args.fsbno == NULLFSBLOCK) {
2899 /*
2900 * Exact allocation failed. Now try with alignment
2901 * turned on.
2902 */
2903 args.type = atype;
2904 args.fsbno = ap->rval;
2905 args.alignment = mp->m_dalign;
2906 args.minlen = nextminlen;
2907 args.minalignslop = 0;
2908 isaligned = 1;
2909 if ((error = xfs_alloc_vextent(&args)))
2910 return error;
2911 }
2912 if (isaligned && args.fsbno == NULLFSBLOCK) {
2913 /*
2914 * allocation failed, so turn off alignment and
2915 * try again.
2916 */
2917 args.type = atype;
2918 args.fsbno = ap->rval;
2919 args.alignment = 0;
2920 if ((error = xfs_alloc_vextent(&args)))
2921 return error;
2922 }
2923 if (args.fsbno == NULLFSBLOCK && nullfb &&
2924 args.minlen > ap->minlen) {
2925 args.minlen = ap->minlen;
2926 args.type = XFS_ALLOCTYPE_START_BNO;
2927 args.fsbno = ap->rval;
2928 if ((error = xfs_alloc_vextent(&args)))
2929 return error;
2930 }
2931 if (args.fsbno == NULLFSBLOCK && nullfb) {
2932 args.fsbno = 0;
2933 args.type = XFS_ALLOCTYPE_FIRST_AG;
2934 args.total = ap->minlen;
2935 args.minleft = 0;
2936 if ((error = xfs_alloc_vextent(&args)))
2937 return error;
2938 ap->low = 1;
2939 }
2940 if (args.fsbno != NULLFSBLOCK) {
2941 ap->firstblock = ap->rval = args.fsbno;
2942 ASSERT(nullfb || fb_agno == args.agno ||
2943 (ap->low && fb_agno < args.agno));
2944 ap->alen = args.len;
2945 ap->ip->i_d.di_nblocks += args.len;
2946 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2947 if (ap->wasdel)
2948 ap->ip->i_delayed_blks -= args.len;
2949 /*
2950 * Adjust the disk quota also. This was reserved
2951 * earlier.
2952 */
2953 XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
2954 ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
2955 XFS_TRANS_DQ_BCOUNT,
2956 (long) args.len);
2957 } else {
2958 ap->rval = NULLFSBLOCK;
2959 ap->alen = 0;
2960 }
2961 return 0;
2962 }
2963
2964 /*
2965 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
2966 * It figures out where to ask the underlying allocator to put the new extent.
2967 */
2968 STATIC int
2969 xfs_bmap_alloc(
2970 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2971 {
2972 if (XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata)
2973 return xfs_bmap_rtalloc(ap);
2974 return xfs_bmap_btalloc(ap);
2975 }
2976
2977 /*
2978 * Transform a btree format file with only one leaf node, where the
2979 * extents list will fit in the inode, into an extents format file.
2980 * Since the file extents are already in-core, all we have to do is
2981 * give up the space for the btree root and pitch the leaf block.
2982 */
2983 STATIC int /* error */
2984 xfs_bmap_btree_to_extents(
2985 xfs_trans_t *tp, /* transaction pointer */
2986 xfs_inode_t *ip, /* incore inode pointer */
2987 xfs_btree_cur_t *cur, /* btree cursor */
2988 int *logflagsp, /* inode logging flags */
2989 int whichfork) /* data or attr fork */
2990 {
2991 /* REFERENCED */
2992 xfs_bmbt_block_t *cblock;/* child btree block */
2993 xfs_fsblock_t cbno; /* child block number */
2994 xfs_buf_t *cbp; /* child block's buffer */
2995 int error; /* error return value */
2996 xfs_ifork_t *ifp; /* inode fork data */
2997 xfs_mount_t *mp; /* mount point structure */
2998 __be64 *pp; /* ptr to block address */
2999 xfs_bmbt_block_t *rblock;/* root btree block */
3000
3001 ifp = XFS_IFORK_PTR(ip, whichfork);
3002 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
3003 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
3004 rblock = ifp->if_broot;
3005 ASSERT(be16_to_cpu(rblock->bb_level) == 1);
3006 ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
3007 ASSERT(XFS_BMAP_BROOT_MAXRECS(ifp->if_broot_bytes) == 1);
3008 mp = ip->i_mount;
3009 pp = XFS_BMAP_BROOT_PTR_ADDR(rblock, 1, ifp->if_broot_bytes);
3010 cbno = be64_to_cpu(*pp);
3011 *logflagsp = 0;
3012 #ifdef DEBUG
3013 if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
3014 return error;
3015 #endif
3016 if ((error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp,
3017 XFS_BMAP_BTREE_REF)))
3018 return error;
3019 cblock = XFS_BUF_TO_BMBT_BLOCK(cbp);
3020 if ((error = xfs_btree_check_lblock(cur, cblock, 0, cbp)))
3021 return error;
3022 xfs_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
3023 ip->i_d.di_nblocks--;
3024 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
3025 xfs_trans_binval(tp, cbp);
3026 if (cur->bc_bufs[0] == cbp)
3027 cur->bc_bufs[0] = NULL;
3028 xfs_iroot_realloc(ip, -1, whichfork);
3029 ASSERT(ifp->if_broot == NULL);
3030 ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
3031 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
3032 *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
3033 return 0;
3034 }
3035
3036 /*
3037 * Called by xfs_bmapi to update file extent records and the btree
3038 * after removing space (or undoing a delayed allocation).
3039 */
3040 STATIC int /* error */
3041 xfs_bmap_del_extent(
3042 xfs_inode_t *ip, /* incore inode pointer */
3043 xfs_trans_t *tp, /* current transaction pointer */
3044 xfs_extnum_t idx, /* extent number to update/delete */
3045 xfs_bmap_free_t *flist, /* list of extents to be freed */
3046 xfs_btree_cur_t *cur, /* if null, not a btree */
3047 xfs_bmbt_irec_t *del, /* data to remove from extents */
3048 int *logflagsp, /* inode logging flags */
3049 xfs_extdelta_t *delta, /* Change made to incore extents */
3050 int whichfork, /* data or attr fork */
3051 int rsvd) /* OK to allocate reserved blocks */
3052 {
3053 xfs_filblks_t da_new; /* new delay-alloc indirect blocks */
3054 xfs_filblks_t da_old; /* old delay-alloc indirect blocks */
3055 xfs_fsblock_t del_endblock=0; /* first block past del */
3056 xfs_fileoff_t del_endoff; /* first offset past del */
3057 int delay; /* current block is delayed allocated */
3058 int do_fx; /* free extent at end of routine */
3059 xfs_bmbt_rec_host_t *ep; /* current extent entry pointer */
3060 int error; /* error return value */
3061 int flags; /* inode logging flags */
3062 xfs_bmbt_irec_t got; /* current extent entry */
3063 xfs_fileoff_t got_endoff; /* first offset past got */
3064 int i; /* temp state */
3065 xfs_ifork_t *ifp; /* inode fork pointer */
3066 xfs_mount_t *mp; /* mount structure */
3067 xfs_filblks_t nblks; /* quota/sb block count */
3068 xfs_bmbt_irec_t new; /* new record to be inserted */
3069 /* REFERENCED */
3070 uint qfield; /* quota field to update */
3071 xfs_filblks_t temp; /* for indirect length calculations */
3072 xfs_filblks_t temp2; /* for indirect length calculations */
3073
3074 XFS_STATS_INC(xs_del_exlist);
3075 mp = ip->i_mount;
3076 ifp = XFS_IFORK_PTR(ip, whichfork);
3077 ASSERT((idx >= 0) && (idx < ifp->if_bytes /
3078 (uint)sizeof(xfs_bmbt_rec_t)));
3079 ASSERT(del->br_blockcount > 0);
3080 ep = xfs_iext_get_ext(ifp, idx);
3081 xfs_bmbt_get_all(ep, &got);
3082 ASSERT(got.br_startoff <= del->br_startoff);
3083 del_endoff = del->br_startoff + del->br_blockcount;
3084 got_endoff = got.br_startoff + got.br_blockcount;
3085 ASSERT(got_endoff >= del_endoff);
3086 delay = ISNULLSTARTBLOCK(got.br_startblock);
3087 ASSERT(ISNULLSTARTBLOCK(del->br_startblock) == delay);
3088 flags = 0;
3089 qfield = 0;
3090 error = 0;
3091 /*
3092 * If deleting a real allocation, must free up the disk space.
3093 */
3094 if (!delay) {
3095 flags = XFS_ILOG_CORE;
3096 /*
3097 * Realtime allocation. Free it and record di_nblocks update.
3098 */
3099 if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
3100 xfs_fsblock_t bno;
3101 xfs_filblks_t len;
3102
3103 ASSERT(do_mod(del->br_blockcount,
3104 mp->m_sb.sb_rextsize) == 0);
3105 ASSERT(do_mod(del->br_startblock,
3106 mp->m_sb.sb_rextsize) == 0);
3107 bno = del->br_startblock;
3108 len = del->br_blockcount;
3109 do_div(bno, mp->m_sb.sb_rextsize);
3110 do_div(len, mp->m_sb.sb_rextsize);
3111 if ((error = xfs_rtfree_extent(ip->i_transp, bno,
3112 (xfs_extlen_t)len)))
3113 goto done;
3114 do_fx = 0;
3115 nblks = len * mp->m_sb.sb_rextsize;
3116 qfield = XFS_TRANS_DQ_RTBCOUNT;
3117 }
3118 /*
3119 * Ordinary allocation.
3120 */
3121 else {
3122 do_fx = 1;
3123 nblks = del->br_blockcount;
3124 qfield = XFS_TRANS_DQ_BCOUNT;
3125 }
3126 /*
3127 * Set up del_endblock and cur for later.
3128 */
3129 del_endblock = del->br_startblock + del->br_blockcount;
3130 if (cur) {
3131 if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
3132 got.br_startblock, got.br_blockcount,
3133 &i)))
3134 goto done;
3135 ASSERT(i == 1);
3136 }
3137 da_old = da_new = 0;
3138 } else {
3139 da_old = STARTBLOCKVAL(got.br_startblock);
3140 da_new = 0;
3141 nblks = 0;
3142 do_fx = 0;
3143 }
3144 /*
3145 * Set flag value to use in switch statement.
3146 * Left-contig is 2, right-contig is 1.
3147 */
3148 switch (((got.br_startoff == del->br_startoff) << 1) |
3149 (got_endoff == del_endoff)) {
3150 case 3:
3151 /*
3152 * Matches the whole extent. Delete the entry.
3153 */
3154 XFS_BMAP_TRACE_DELETE("3", ip, idx, 1, whichfork);
3155 xfs_iext_remove(ifp, idx, 1);
3156 ifp->if_lastex = idx;
3157 if (delay)
3158 break;
3159 XFS_IFORK_NEXT_SET(ip, whichfork,
3160 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
3161 flags |= XFS_ILOG_CORE;
3162 if (!cur) {
3163 flags |= XFS_ILOG_FEXT(whichfork);
3164 break;
3165 }
3166 if ((error = xfs_bmbt_delete(cur, &i)))
3167 goto done;
3168 ASSERT(i == 1);
3169 break;
3170
3171 case 2:
3172 /*
3173 * Deleting the first part of the extent.
3174 */
3175 XFS_BMAP_TRACE_PRE_UPDATE("2", ip, idx, whichfork);
3176 xfs_bmbt_set_startoff(ep, del_endoff);
3177 temp = got.br_blockcount - del->br_blockcount;
3178 xfs_bmbt_set_blockcount(ep, temp);
3179 ifp->if_lastex = idx;
3180 if (delay) {
3181 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
3182 da_old);
3183 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
3184 XFS_BMAP_TRACE_POST_UPDATE("2", ip, idx,
3185 whichfork);
3186 da_new = temp;
3187 break;
3188 }
3189 xfs_bmbt_set_startblock(ep, del_endblock);
3190 XFS_BMAP_TRACE_POST_UPDATE("2", ip, idx, whichfork);
3191 if (!cur) {
3192 flags |= XFS_ILOG_FEXT(whichfork);
3193 break;
3194 }
3195 if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
3196 got.br_blockcount - del->br_blockcount,
3197 got.br_state)))
3198 goto done;
3199 break;
3200
3201 case 1:
3202 /*
3203 * Deleting the last part of the extent.
3204 */
3205 temp = got.br_blockcount - del->br_blockcount;
3206 XFS_BMAP_TRACE_PRE_UPDATE("1", ip, idx, whichfork);
3207 xfs_bmbt_set_blockcount(ep, temp);
3208 ifp->if_lastex = idx;
3209 if (delay) {
3210 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
3211 da_old);
3212 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
3213 XFS_BMAP_TRACE_POST_UPDATE("1", ip, idx,
3214 whichfork);
3215 da_new = temp;
3216 break;
3217 }
3218 XFS_BMAP_TRACE_POST_UPDATE("1", ip, idx, whichfork);
3219 if (!cur) {
3220 flags |= XFS_ILOG_FEXT(whichfork);
3221 break;
3222 }
3223 if ((error = xfs_bmbt_update(cur, got.br_startoff,
3224 got.br_startblock,
3225 got.br_blockcount - del->br_blockcount,
3226 got.br_state)))
3227 goto done;
3228 break;
3229
3230 case 0:
3231 /*
3232 * Deleting the middle of the extent.
3233 */
3234 temp = del->br_startoff - got.br_startoff;
3235 XFS_BMAP_TRACE_PRE_UPDATE("0", ip, idx, whichfork);
3236 xfs_bmbt_set_blockcount(ep, temp);
3237 new.br_startoff = del_endoff;
3238 temp2 = got_endoff - del_endoff;
3239 new.br_blockcount = temp2;
3240 new.br_state = got.br_state;
3241 if (!delay) {
3242 new.br_startblock = del_endblock;
3243 flags |= XFS_ILOG_CORE;
3244 if (cur) {
3245 if ((error = xfs_bmbt_update(cur,
3246 got.br_startoff,
3247 got.br_startblock, temp,
3248 got.br_state)))
3249 goto done;
3250 if ((error = xfs_bmbt_increment(cur, 0, &i)))
3251 goto done;
3252 cur->bc_rec.b = new;
3253 error = xfs_bmbt_insert(cur, &i);
3254 if (error && error != ENOSPC)
3255 goto done;
3256 /*
3257 * If get no-space back from btree insert,
3258 * it tried a split, and we have a zero
3259 * block reservation.
3260 * Fix up our state and return the error.
3261 */
3262 if (error == ENOSPC) {
3263 /*
3264 * Reset the cursor, don't trust
3265 * it after any insert operation.
3266 */
3267 if ((error = xfs_bmbt_lookup_eq(cur,
3268 got.br_startoff,
3269 got.br_startblock,
3270 temp, &i)))
3271 goto done;
3272 ASSERT(i == 1);
3273 /*
3274 * Update the btree record back
3275 * to the original value.
3276 */
3277 if ((error = xfs_bmbt_update(cur,
3278 got.br_startoff,
3279 got.br_startblock,
3280 got.br_blockcount,
3281 got.br_state)))
3282 goto done;
3283 /*
3284 * Reset the extent record back
3285 * to the original value.
3286 */
3287 xfs_bmbt_set_blockcount(ep,
3288 got.br_blockcount);
3289 flags = 0;
3290 error = XFS_ERROR(ENOSPC);
3291 goto done;
3292 }
3293 ASSERT(i == 1);
3294 } else
3295 flags |= XFS_ILOG_FEXT(whichfork);
3296 XFS_IFORK_NEXT_SET(ip, whichfork,
3297 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
3298 } else {
3299 ASSERT(whichfork == XFS_DATA_FORK);
3300 temp = xfs_bmap_worst_indlen(ip, temp);
3301 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
3302 temp2 = xfs_bmap_worst_indlen(ip, temp2);
3303 new.br_startblock = NULLSTARTBLOCK((int)temp2);
3304 da_new = temp + temp2;
3305 while (da_new > da_old) {
3306 if (temp) {
3307 temp--;
3308 da_new--;
3309 xfs_bmbt_set_startblock(ep,
3310 NULLSTARTBLOCK((int)temp));
3311 }
3312 if (da_new == da_old)
3313 break;
3314 if (temp2) {
3315 temp2--;
3316 da_new--;
3317 new.br_startblock =
3318 NULLSTARTBLOCK((int)temp2);
3319 }
3320 }
3321 }
3322 XFS_BMAP_TRACE_POST_UPDATE("0", ip, idx, whichfork);
3323 XFS_BMAP_TRACE_INSERT("0", ip, idx + 1, 1, &new, NULL,
3324 whichfork);
3325 xfs_iext_insert(ifp, idx + 1, 1, &new);
3326 ifp->if_lastex = idx + 1;
3327 break;
3328 }
3329 /*
3330 * If we need to, add to list of extents to delete.
3331 */
3332 if (do_fx)
3333 xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
3334 mp);
3335 /*
3336 * Adjust inode # blocks in the file.
3337 */
3338 if (nblks)
3339 ip->i_d.di_nblocks -= nblks;
3340 /*
3341 * Adjust quota data.
3342 */
3343 if (qfield)
3344 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, qfield, (long)-nblks);
3345
3346 /*
3347 * Account for change in delayed indirect blocks.
3348 * Nothing to do for disk quota accounting here.
3349 */
3350 ASSERT(da_old >= da_new);
3351 if (da_old > da_new)
3352 xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, (int64_t)(da_old - da_new),
3353 rsvd);
3354 if (delta) {
3355 /* DELTA: report the original extent. */
3356 if (delta->xed_startoff > got.br_startoff)
3357 delta->xed_startoff = got.br_startoff;
3358 if (delta->xed_blockcount < got.br_startoff+got.br_blockcount)
3359 delta->xed_blockcount = got.br_startoff +
3360 got.br_blockcount;
3361 }
3362 done:
3363 *logflagsp = flags;
3364 return error;
3365 }
3366
3367 /*
3368 * Remove the entry "free" from the free item list. Prev points to the
3369 * previous entry, unless "free" is the head of the list.
3370 */
3371 STATIC void
3372 xfs_bmap_del_free(
3373 xfs_bmap_free_t *flist, /* free item list header */
3374 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
3375 xfs_bmap_free_item_t *free) /* list item to be freed */
3376 {
3377 if (prev)
3378 prev->xbfi_next = free->xbfi_next;
3379 else
3380 flist->xbf_first = free->xbfi_next;
3381 flist->xbf_count--;
3382 kmem_zone_free(xfs_bmap_free_item_zone, free);
3383 }
3384
3385 /*
3386 * Convert an extents-format file into a btree-format file.
3387 * The new file will have a root block (in the inode) and a single child block.
3388 */
3389 STATIC int /* error */
3390 xfs_bmap_extents_to_btree(
3391 xfs_trans_t *tp, /* transaction pointer */
3392 xfs_inode_t *ip, /* incore inode pointer */
3393 xfs_fsblock_t *firstblock, /* first-block-allocated */
3394 xfs_bmap_free_t *flist, /* blocks freed in xaction */
3395 xfs_btree_cur_t **curp, /* cursor returned to caller */
3396 int wasdel, /* converting a delayed alloc */
3397 int *logflagsp, /* inode logging flags */
3398 int whichfork) /* data or attr fork */
3399 {
3400 xfs_bmbt_block_t *ablock; /* allocated (child) bt block */
3401 xfs_buf_t *abp; /* buffer for ablock */
3402 xfs_alloc_arg_t args; /* allocation arguments */
3403 xfs_bmbt_rec_t *arp; /* child record pointer */
3404 xfs_bmbt_block_t *block; /* btree root block */
3405 xfs_btree_cur_t *cur; /* bmap btree cursor */
3406 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3407 int error; /* error return value */
3408 xfs_extnum_t i, cnt; /* extent record index */
3409 xfs_ifork_t *ifp; /* inode fork pointer */
3410 xfs_bmbt_key_t *kp; /* root block key pointer */
3411 xfs_mount_t *mp; /* mount structure */
3412 xfs_extnum_t nextents; /* number of file extents */
3413 xfs_bmbt_ptr_t *pp; /* root block address pointer */
3414
3415 ifp = XFS_IFORK_PTR(ip, whichfork);
3416 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
3417 ASSERT(ifp->if_ext_max ==
3418 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
3419 /*
3420 * Make space in the inode incore.
3421 */
3422 xfs_iroot_realloc(ip, 1, whichfork);
3423 ifp->if_flags |= XFS_IFBROOT;
3424 /*
3425 * Fill in the root.
3426 */
3427 block = ifp->if_broot;
3428 block->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3429 block->bb_level = cpu_to_be16(1);
3430 block->bb_numrecs = cpu_to_be16(1);
3431 block->bb_leftsib = cpu_to_be64(NULLDFSBNO);
3432 block->bb_rightsib = cpu_to_be64(NULLDFSBNO);
3433 /*
3434 * Need a cursor. Can't allocate until bb_level is filled in.
3435 */
3436 mp = ip->i_mount;
3437 cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
3438 whichfork);
3439 cur->bc_private.b.firstblock = *firstblock;
3440 cur->bc_private.b.flist = flist;
3441 cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
3442 /*
3443 * Convert to a btree with two levels, one record in root.
3444 */
3445 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
3446 args.tp = tp;
3447 args.mp = mp;
3448 args.firstblock = *firstblock;
3449 if (*firstblock == NULLFSBLOCK) {
3450 args.type = XFS_ALLOCTYPE_START_BNO;
3451 args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
3452 } else if (flist->xbf_low) {
3453 args.type = XFS_ALLOCTYPE_START_BNO;
3454 args.fsbno = *firstblock;
3455 } else {
3456 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3457 args.fsbno = *firstblock;
3458 }
3459 args.minlen = args.maxlen = args.prod = 1;
3460 args.total = args.minleft = args.alignment = args.mod = args.isfl =
3461 args.minalignslop = 0;
3462 args.wasdel = wasdel;
3463 *logflagsp = 0;
3464 if ((error = xfs_alloc_vextent(&args))) {
3465 xfs_iroot_realloc(ip, -1, whichfork);
3466 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
3467 return error;
3468 }
3469 /*
3470 * Allocation can't fail, the space was reserved.
3471 */
3472 ASSERT(args.fsbno != NULLFSBLOCK);
3473 ASSERT(*firstblock == NULLFSBLOCK ||
3474 args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) ||
3475 (flist->xbf_low &&
3476 args.agno > XFS_FSB_TO_AGNO(mp, *firstblock)));
3477 *firstblock = cur->bc_private.b.firstblock = args.fsbno;
3478 cur->bc_private.b.allocated++;
3479 ip->i_d.di_nblocks++;
3480 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
3481 abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
3482 /*
3483 * Fill in the child block.
3484 */
3485 ablock = XFS_BUF_TO_BMBT_BLOCK(abp);
3486 ablock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3487 ablock->bb_level = 0;
3488 ablock->bb_leftsib = cpu_to_be64(NULLDFSBNO);
3489 ablock->bb_rightsib = cpu_to_be64(NULLDFSBNO);
3490 arp = XFS_BMAP_REC_IADDR(ablock, 1, cur);
3491 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3492 for (cnt = i = 0; i < nextents; i++) {
3493 ep = xfs_iext_get_ext(ifp, i);
3494 if (!ISNULLSTARTBLOCK(xfs_bmbt_get_startblock(ep))) {
3495 arp->l0 = cpu_to_be64(ep->l0);
3496 arp->l1 = cpu_to_be64(ep->l1);
3497 arp++; cnt++;
3498 }
3499 }
3500 ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
3501 ablock->bb_numrecs = cpu_to_be16(cnt);
3502 /*
3503 * Fill in the root key and pointer.
3504 */
3505 kp = XFS_BMAP_KEY_IADDR(block, 1, cur);
3506 arp = XFS_BMAP_REC_IADDR(ablock, 1, cur);
3507 kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
3508 pp = XFS_BMAP_PTR_IADDR(block, 1, cur);
3509 *pp = cpu_to_be64(args.fsbno);
3510 /*
3511 * Do all this logging at the end so that
3512 * the root is at the right level.
3513 */
3514 xfs_bmbt_log_block(cur, abp, XFS_BB_ALL_BITS);
3515 xfs_bmbt_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
3516 ASSERT(*curp == NULL);
3517 *curp = cur;
3518 *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FBROOT(whichfork);
3519 return 0;
3520 }
3521
3522 /*
3523 * Helper routine to reset inode di_forkoff field when switching
3524 * attribute fork from local to extent format - we reset it where
3525 * possible to make space available for inline data fork extents.
3526 */
3527 STATIC void
3528 xfs_bmap_forkoff_reset(
3529 xfs_mount_t *mp,
3530 xfs_inode_t *ip,
3531 int whichfork)
3532 {
3533 if (whichfork == XFS_ATTR_FORK &&
3534 (ip->i_d.di_format != XFS_DINODE_FMT_DEV) &&
3535 (ip->i_d.di_format != XFS_DINODE_FMT_UUID) &&
3536 (ip->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
3537 ((mp->m_attroffset >> 3) > ip->i_d.di_forkoff)) {
3538 ip->i_d.di_forkoff = mp->m_attroffset >> 3;
3539 ip->i_df.if_ext_max = XFS_IFORK_DSIZE(ip) /
3540 (uint)sizeof(xfs_bmbt_rec_t);
3541 ip->i_afp->if_ext_max = XFS_IFORK_ASIZE(ip) /
3542 (uint)sizeof(xfs_bmbt_rec_t);
3543 }
3544 }
3545
3546 /*
3547 * Convert a local file to an extents file.
3548 * This code is out of bounds for data forks of regular files,
3549 * since the file data needs to get logged so things will stay consistent.
3550 * (The bmap-level manipulations are ok, though).
3551 */
3552 STATIC int /* error */
3553 xfs_bmap_local_to_extents(
3554 xfs_trans_t *tp, /* transaction pointer */
3555 xfs_inode_t *ip, /* incore inode pointer */
3556 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
3557 xfs_extlen_t total, /* total blocks needed by transaction */
3558 int *logflagsp, /* inode logging flags */
3559 int whichfork) /* data or attr fork */
3560 {
3561 int error; /* error return value */
3562 int flags; /* logging flags returned */
3563 xfs_ifork_t *ifp; /* inode fork pointer */
3564
3565 /*
3566 * We don't want to deal with the case of keeping inode data inline yet.
3567 * So sending the data fork of a regular inode is invalid.
3568 */
3569 ASSERT(!((ip->i_d.di_mode & S_IFMT) == S_IFREG &&
3570 whichfork == XFS_DATA_FORK));
3571 ifp = XFS_IFORK_PTR(ip, whichfork);
3572 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
3573 flags = 0;
3574 error = 0;
3575 if (ifp->if_bytes) {
3576 xfs_alloc_arg_t args; /* allocation arguments */
3577 xfs_buf_t *bp; /* buffer for extent block */
3578 xfs_bmbt_rec_host_t *ep;/* extent record pointer */
3579
3580 args.tp = tp;
3581 args.mp = ip->i_mount;
3582 args.firstblock = *firstblock;
3583 ASSERT((ifp->if_flags &
3584 (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) == XFS_IFINLINE);
3585 /*
3586 * Allocate a block. We know we need only one, since the
3587 * file currently fits in an inode.
3588 */
3589 if (*firstblock == NULLFSBLOCK) {
3590 args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
3591 args.type = XFS_ALLOCTYPE_START_BNO;
3592 } else {
3593 args.fsbno = *firstblock;
3594 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3595 }
3596 args.total = total;
3597 args.mod = args.minleft = args.alignment = args.wasdel =
3598 args.isfl = args.minalignslop = 0;
3599 args.minlen = args.maxlen = args.prod = 1;
3600 if ((error = xfs_alloc_vextent(&args)))
3601 goto done;
3602 /*
3603 * Can't fail, the space was reserved.
3604 */
3605 ASSERT(args.fsbno != NULLFSBLOCK);
3606 ASSERT(args.len == 1);
3607 *firstblock = args.fsbno;
3608 bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
3609 memcpy((char *)XFS_BUF_PTR(bp), ifp->if_u1.if_data,
3610 ifp->if_bytes);
3611 xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
3612 xfs_bmap_forkoff_reset(args.mp, ip, whichfork);
3613 xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
3614 xfs_iext_add(ifp, 0, 1);
3615 ep = xfs_iext_get_ext(ifp, 0);
3616 xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
3617 XFS_BMAP_TRACE_POST_UPDATE("new", ip, 0, whichfork);
3618 XFS_IFORK_NEXT_SET(ip, whichfork, 1);
3619 ip->i_d.di_nblocks = 1;
3620 XFS_TRANS_MOD_DQUOT_BYINO(args.mp, tp, ip,
3621 XFS_TRANS_DQ_BCOUNT, 1L);
3622 flags |= XFS_ILOG_FEXT(whichfork);
3623 } else {
3624 ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
3625 xfs_bmap_forkoff_reset(ip->i_mount, ip, whichfork);
3626 }
3627 ifp->if_flags &= ~XFS_IFINLINE;
3628 ifp->if_flags |= XFS_IFEXTENTS;
3629 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
3630 flags |= XFS_ILOG_CORE;
3631 done:
3632 *logflagsp = flags;
3633 return error;
3634 }
3635
3636 /*
3637 * Search the extent records for the entry containing block bno.
3638 * If bno lies in a hole, point to the next entry. If bno lies
3639 * past eof, *eofp will be set, and *prevp will contain the last
3640 * entry (null if none). Else, *lastxp will be set to the index
3641 * of the found entry; *gotp will contain the entry.
3642 */
3643 xfs_bmbt_rec_host_t * /* pointer to found extent entry */
3644 xfs_bmap_search_multi_extents(
3645 xfs_ifork_t *ifp, /* inode fork pointer */
3646 xfs_fileoff_t bno, /* block number searched for */
3647 int *eofp, /* out: end of file found */
3648 xfs_extnum_t *lastxp, /* out: last extent index */
3649 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3650 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3651 {
3652 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3653 xfs_extnum_t lastx; /* last extent index */
3654
3655 /*
3656 * Initialize the extent entry structure to catch access to
3657 * uninitialized br_startblock field.
3658 */
3659 gotp->br_startoff = 0xffa5a5a5a5a5a5a5LL;
3660 gotp->br_blockcount = 0xa55a5a5a5a5a5a5aLL;
3661 gotp->br_state = XFS_EXT_INVALID;
3662 #if XFS_BIG_BLKNOS
3663 gotp->br_startblock = 0xffffa5a5a5a5a5a5LL;
3664 #else
3665 gotp->br_startblock = 0xffffa5a5;
3666 #endif
3667 prevp->br_startoff = NULLFILEOFF;
3668
3669 ep = xfs_iext_bno_to_ext(ifp, bno, &lastx);
3670 if (lastx > 0) {
3671 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx - 1), prevp);
3672 }
3673 if (lastx < (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
3674 xfs_bmbt_get_all(ep, gotp);
3675 *eofp = 0;
3676 } else {
3677 if (lastx > 0) {
3678 *gotp = *prevp;
3679 }
3680 *eofp = 1;
3681 ep = NULL;
3682 }
3683 *lastxp = lastx;
3684 return ep;
3685 }
3686
3687 /*
3688 * Search the extents list for the inode, for the extent containing bno.
3689 * If bno lies in a hole, point to the next entry. If bno lies past eof,
3690 * *eofp will be set, and *prevp will contain the last entry (null if none).
3691 * Else, *lastxp will be set to the index of the found
3692 * entry; *gotp will contain the entry.
3693 */
3694 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
3695 xfs_bmap_search_extents(
3696 xfs_inode_t *ip, /* incore inode pointer */
3697 xfs_fileoff_t bno, /* block number searched for */
3698 int fork, /* data or attr fork */
3699 int *eofp, /* out: end of file found */
3700 xfs_extnum_t *lastxp, /* out: last extent index */
3701 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3702 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3703 {
3704 xfs_ifork_t *ifp; /* inode fork pointer */
3705 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3706
3707 XFS_STATS_INC(xs_look_exlist);
3708 ifp = XFS_IFORK_PTR(ip, fork);
3709
3710 ep = xfs_bmap_search_multi_extents(ifp, bno, eofp, lastxp, gotp, prevp);
3711
3712 if (unlikely(!(gotp->br_startblock) && (*lastxp != NULLEXTNUM) &&
3713 !(XFS_IS_REALTIME_INODE(ip) && fork == XFS_DATA_FORK))) {
3714 xfs_cmn_err(XFS_PTAG_FSBLOCK_ZERO, CE_ALERT, ip->i_mount,
3715 "Access to block zero in inode %llu "
3716 "start_block: %llx start_off: %llx "
3717 "blkcnt: %llx extent-state: %x lastx: %x\n",
3718 (unsigned long long)ip->i_ino,
3719 (unsigned long long)gotp->br_startblock,
3720 (unsigned long long)gotp->br_startoff,
3721 (unsigned long long)gotp->br_blockcount,
3722 gotp->br_state, *lastxp);
3723 *lastxp = NULLEXTNUM;
3724 *eofp = 1;
3725 return NULL;
3726 }
3727 return ep;
3728 }
3729
3730
3731 #ifdef XFS_BMAP_TRACE
3732 ktrace_t *xfs_bmap_trace_buf;
3733
3734 /*
3735 * Add a bmap trace buffer entry. Base routine for the others.
3736 */
3737 STATIC void
3738 xfs_bmap_trace_addentry(
3739 int opcode, /* operation */
3740 const char *fname, /* function name */
3741 char *desc, /* operation description */
3742 xfs_inode_t *ip, /* incore inode pointer */
3743 xfs_extnum_t idx, /* index of entry(ies) */
3744 xfs_extnum_t cnt, /* count of entries, 1 or 2 */
3745 xfs_bmbt_rec_host_t *r1, /* first record */
3746 xfs_bmbt_rec_host_t *r2, /* second record or null */
3747 int whichfork) /* data or attr fork */
3748 {
3749 xfs_bmbt_rec_host_t tr2;
3750
3751 ASSERT(cnt == 1 || cnt == 2);
3752 ASSERT(r1 != NULL);
3753 if (cnt == 1) {
3754 ASSERT(r2 == NULL);
3755 r2 = &tr2;
3756 memset(&tr2, 0, sizeof(tr2));
3757 } else
3758 ASSERT(r2 != NULL);
3759 ktrace_enter(xfs_bmap_trace_buf,
3760 (void *)(__psint_t)(opcode | (whichfork << 16)),
3761 (void *)fname, (void *)desc, (void *)ip,
3762 (void *)(__psint_t)idx,
3763 (void *)(__psint_t)cnt,
3764 (void *)(__psunsigned_t)(ip->i_ino >> 32),
3765 (void *)(__psunsigned_t)(unsigned)ip->i_ino,
3766 (void *)(__psunsigned_t)(r1->l0 >> 32),
3767 (void *)(__psunsigned_t)(unsigned)(r1->l0),
3768 (void *)(__psunsigned_t)(r1->l1 >> 32),
3769 (void *)(__psunsigned_t)(unsigned)(r1->l1),
3770 (void *)(__psunsigned_t)(r2->l0 >> 32),
3771 (void *)(__psunsigned_t)(unsigned)(r2->l0),
3772 (void *)(__psunsigned_t)(r2->l1 >> 32),
3773 (void *)(__psunsigned_t)(unsigned)(r2->l1)
3774 );
3775 ASSERT(ip->i_xtrace);
3776 ktrace_enter(ip->i_xtrace,
3777 (void *)(__psint_t)(opcode | (whichfork << 16)),
3778 (void *)fname, (void *)desc, (void *)ip,
3779 (void *)(__psint_t)idx,
3780 (void *)(__psint_t)cnt,
3781 (void *)(__psunsigned_t)(ip->i_ino >> 32),
3782 (void *)(__psunsigned_t)(unsigned)ip->i_ino,
3783 (void *)(__psunsigned_t)(r1->l0 >> 32),
3784 (void *)(__psunsigned_t)(unsigned)(r1->l0),
3785 (void *)(__psunsigned_t)(r1->l1 >> 32),
3786 (void *)(__psunsigned_t)(unsigned)(r1->l1),
3787 (void *)(__psunsigned_t)(r2->l0 >> 32),
3788 (void *)(__psunsigned_t)(unsigned)(r2->l0),
3789 (void *)(__psunsigned_t)(r2->l1 >> 32),
3790 (void *)(__psunsigned_t)(unsigned)(r2->l1)
3791 );
3792 }
3793
3794 /*
3795 * Add bmap trace entry prior to a call to xfs_iext_remove.
3796 */
3797 STATIC void
3798 xfs_bmap_trace_delete(
3799 const char *fname, /* function name */
3800 char *desc, /* operation description */
3801 xfs_inode_t *ip, /* incore inode pointer */
3802 xfs_extnum_t idx, /* index of entry(entries) deleted */
3803 xfs_extnum_t cnt, /* count of entries deleted, 1 or 2 */
3804 int whichfork) /* data or attr fork */
3805 {
3806 xfs_ifork_t *ifp; /* inode fork pointer */
3807
3808 ifp = XFS_IFORK_PTR(ip, whichfork);
3809 xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_DELETE, fname, desc, ip, idx,
3810 cnt, xfs_iext_get_ext(ifp, idx),
3811 cnt == 2 ? xfs_iext_get_ext(ifp, idx + 1) : NULL,
3812 whichfork);
3813 }
3814
3815 /*
3816 * Add bmap trace entry prior to a call to xfs_iext_insert, or
3817 * reading in the extents list from the disk (in the btree).
3818 */
3819 STATIC void
3820 xfs_bmap_trace_insert(
3821 const char *fname, /* function name */
3822 char *desc, /* operation description */
3823 xfs_inode_t *ip, /* incore inode pointer */
3824 xfs_extnum_t idx, /* index of entry(entries) inserted */
3825 xfs_extnum_t cnt, /* count of entries inserted, 1 or 2 */
3826 xfs_bmbt_irec_t *r1, /* inserted record 1 */
3827 xfs_bmbt_irec_t *r2, /* inserted record 2 or null */
3828 int whichfork) /* data or attr fork */
3829 {
3830 xfs_bmbt_rec_host_t tr1; /* compressed record 1 */
3831 xfs_bmbt_rec_host_t tr2; /* compressed record 2 if needed */
3832
3833 xfs_bmbt_set_all(&tr1, r1);
3834 if (cnt == 2) {
3835 ASSERT(r2 != NULL);
3836 xfs_bmbt_set_all(&tr2, r2);
3837 } else {
3838 ASSERT(cnt == 1);
3839 ASSERT(r2 == NULL);
3840 }
3841 xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_INSERT, fname, desc, ip, idx,
3842 cnt, &tr1, cnt == 2 ? &tr2 : NULL, whichfork);
3843 }
3844
3845 /*
3846 * Add bmap trace entry after updating an extent record in place.
3847 */
3848 STATIC void
3849 xfs_bmap_trace_post_update(
3850 const char *fname, /* function name */
3851 char *desc, /* operation description */
3852 xfs_inode_t *ip, /* incore inode pointer */
3853 xfs_extnum_t idx, /* index of entry updated */
3854 int whichfork) /* data or attr fork */
3855 {
3856 xfs_ifork_t *ifp; /* inode fork pointer */
3857
3858 ifp = XFS_IFORK_PTR(ip, whichfork);
3859 xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_POST_UP, fname, desc, ip, idx,
3860 1, xfs_iext_get_ext(ifp, idx), NULL, whichfork);
3861 }
3862
3863 /*
3864 * Add bmap trace entry prior to updating an extent record in place.
3865 */
3866 STATIC void
3867 xfs_bmap_trace_pre_update(
3868 const char *fname, /* function name */
3869 char *desc, /* operation description */
3870 xfs_inode_t *ip, /* incore inode pointer */
3871 xfs_extnum_t idx, /* index of entry to be updated */
3872 int whichfork) /* data or attr fork */
3873 {
3874 xfs_ifork_t *ifp; /* inode fork pointer */
3875
3876 ifp = XFS_IFORK_PTR(ip, whichfork);
3877 xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_PRE_UP, fname, desc, ip, idx, 1,
3878 xfs_iext_get_ext(ifp, idx), NULL, whichfork);
3879 }
3880 #endif /* XFS_BMAP_TRACE */
3881
3882 /*
3883 * Compute the worst-case number of indirect blocks that will be used
3884 * for ip's delayed extent of length "len".
3885 */
3886 STATIC xfs_filblks_t
3887 xfs_bmap_worst_indlen(
3888 xfs_inode_t *ip, /* incore inode pointer */
3889 xfs_filblks_t len) /* delayed extent length */
3890 {
3891 int level; /* btree level number */
3892 int maxrecs; /* maximum record count at this level */
3893 xfs_mount_t *mp; /* mount structure */
3894 xfs_filblks_t rval; /* return value */
3895
3896 mp = ip->i_mount;
3897 maxrecs = mp->m_bmap_dmxr[0];
3898 for (level = 0, rval = 0;
3899 level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
3900 level++) {
3901 len += maxrecs - 1;
3902 do_div(len, maxrecs);
3903 rval += len;
3904 if (len == 1)
3905 return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
3906 level - 1;
3907 if (level == 0)
3908 maxrecs = mp->m_bmap_dmxr[1];
3909 }
3910 return rval;
3911 }
3912
3913 #if defined(XFS_RW_TRACE)
3914 STATIC void
3915 xfs_bunmap_trace(
3916 xfs_inode_t *ip,
3917 xfs_fileoff_t bno,
3918 xfs_filblks_t len,
3919 int flags,
3920 inst_t *ra)
3921 {
3922 if (ip->i_rwtrace == NULL)
3923 return;
3924 ktrace_enter(ip->i_rwtrace,
3925 (void *)(__psint_t)XFS_BUNMAP,
3926 (void *)ip,
3927 (void *)(__psint_t)((ip->i_d.di_size >> 32) & 0xffffffff),
3928 (void *)(__psint_t)(ip->i_d.di_size & 0xffffffff),
3929 (void *)(__psint_t)(((xfs_dfiloff_t)bno >> 32) & 0xffffffff),
3930 (void *)(__psint_t)((xfs_dfiloff_t)bno & 0xffffffff),
3931 (void *)(__psint_t)len,
3932 (void *)(__psint_t)flags,
3933 (void *)(unsigned long)current_cpu(),
3934 (void *)ra,
3935 (void *)0,
3936 (void *)0,
3937 (void *)0,
3938 (void *)0,
3939 (void *)0,
3940 (void *)0);
3941 }
3942 #endif
3943
3944 /*
3945 * Convert inode from non-attributed to attributed.
3946 * Must not be in a transaction, ip must not be locked.
3947 */
3948 int /* error code */
3949 xfs_bmap_add_attrfork(
3950 xfs_inode_t *ip, /* incore inode pointer */
3951 int size, /* space new attribute needs */
3952 int rsvd) /* xact may use reserved blks */
3953 {
3954 xfs_fsblock_t firstblock; /* 1st block/ag allocated */
3955 xfs_bmap_free_t flist; /* freed extent records */
3956 xfs_mount_t *mp; /* mount structure */
3957 xfs_trans_t *tp; /* transaction pointer */
3958 int blks; /* space reservation */
3959 int version = 1; /* superblock attr version */
3960 int committed; /* xaction was committed */
3961 int logflags; /* logging flags */
3962 int error; /* error return value */
3963
3964 ASSERT(XFS_IFORK_Q(ip) == 0);
3965 ASSERT(ip->i_df.if_ext_max ==
3966 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3967
3968 mp = ip->i_mount;
3969 ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
3970 tp = xfs_trans_alloc(mp, XFS_TRANS_ADDAFORK);
3971 blks = XFS_ADDAFORK_SPACE_RES(mp);
3972 if (rsvd)
3973 tp->t_flags |= XFS_TRANS_RESERVE;
3974 if ((error = xfs_trans_reserve(tp, blks, XFS_ADDAFORK_LOG_RES(mp), 0,
3975 XFS_TRANS_PERM_LOG_RES, XFS_ADDAFORK_LOG_COUNT)))
3976 goto error0;
3977 xfs_ilock(ip, XFS_ILOCK_EXCL);
3978 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, blks, 0, rsvd ?
3979 XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
3980 XFS_QMOPT_RES_REGBLKS);
3981 if (error) {
3982 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3983 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
3984 return error;
3985 }
3986 if (XFS_IFORK_Q(ip))
3987 goto error1;
3988 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
3989 /*
3990 * For inodes coming from pre-6.2 filesystems.
3991 */
3992 ASSERT(ip->i_d.di_aformat == 0);
3993 ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
3994 }
3995 ASSERT(ip->i_d.di_anextents == 0);
3996 VN_HOLD(XFS_ITOV(ip));
3997 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
3998 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
3999 switch (ip->i_d.di_format) {
4000 case XFS_DINODE_FMT_DEV:
4001 ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
4002 break;
4003 case XFS_DINODE_FMT_UUID:
4004 ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
4005 break;
4006 case XFS_DINODE_FMT_LOCAL:
4007 case XFS_DINODE_FMT_EXTENTS:
4008 case XFS_DINODE_FMT_BTREE:
4009 ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
4010 if (!ip->i_d.di_forkoff)
4011 ip->i_d.di_forkoff = mp->m_attroffset >> 3;
4012 else if (mp->m_flags & XFS_MOUNT_ATTR2)
4013 version = 2;
4014 break;
4015 default:
4016 ASSERT(0);
4017 error = XFS_ERROR(EINVAL);
4018 goto error1;
4019 }
4020 ip->i_df.if_ext_max =
4021 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
4022 ASSERT(ip->i_afp == NULL);
4023 ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
4024 ip->i_afp->if_ext_max =
4025 XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
4026 ip->i_afp->if_flags = XFS_IFEXTENTS;
4027 logflags = 0;
4028 XFS_BMAP_INIT(&flist, &firstblock);
4029 switch (ip->i_d.di_format) {
4030 case XFS_DINODE_FMT_LOCAL:
4031 error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &flist,
4032 &logflags);
4033 break;
4034 case XFS_DINODE_FMT_EXTENTS:
4035 error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
4036 &flist, &logflags);
4037 break;
4038 case XFS_DINODE_FMT_BTREE:
4039 error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &flist,
4040 &logflags);
4041 break;
4042 default:
4043 error = 0;
4044 break;
4045 }
4046 if (logflags)
4047 xfs_trans_log_inode(tp, ip, logflags);
4048 if (error)
4049 goto error2;
4050 if (!xfs_sb_version_hasattr(&mp->m_sb) ||
4051 (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2)) {
4052 __int64_t sbfields = 0;
4053
4054 spin_lock(&mp->m_sb_lock);
4055 if (!xfs_sb_version_hasattr(&mp->m_sb)) {
4056 xfs_sb_version_addattr(&mp->m_sb);
4057 sbfields |= XFS_SB_VERSIONNUM;
4058 }
4059 if (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2) {
4060 xfs_sb_version_addattr2(&mp->m_sb);
4061 sbfields |= (XFS_SB_VERSIONNUM | XFS_SB_FEATURES2);
4062 }
4063 if (sbfields) {
4064 spin_unlock(&mp->m_sb_lock);
4065 xfs_mod_sb(tp, sbfields);
4066 } else
4067 spin_unlock(&mp->m_sb_lock);
4068 }
4069 if ((error = xfs_bmap_finish(&tp, &flist, &committed)))
4070 goto error2;
4071 error = xfs_trans_commit(tp, XFS_TRANS_PERM_LOG_RES);
4072 ASSERT(ip->i_df.if_ext_max ==
4073 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
4074 return error;
4075 error2:
4076 xfs_bmap_cancel(&flist);
4077 error1:
4078 ASSERT(ismrlocked(&ip->i_lock,MR_UPDATE));
4079 xfs_iunlock(ip, XFS_ILOCK_EXCL);
4080 error0:
4081 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
4082 ASSERT(ip->i_df.if_ext_max ==
4083 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
4084 return error;
4085 }
4086
4087 /*
4088 * Add the extent to the list of extents to be free at transaction end.
4089 * The list is maintained sorted (by block number).
4090 */
4091 /* ARGSUSED */
4092 void
4093 xfs_bmap_add_free(
4094 xfs_fsblock_t bno, /* fs block number of extent */
4095 xfs_filblks_t len, /* length of extent */
4096 xfs_bmap_free_t *flist, /* list of extents */
4097 xfs_mount_t *mp) /* mount point structure */
4098 {
4099 xfs_bmap_free_item_t *cur; /* current (next) element */
4100 xfs_bmap_free_item_t *new; /* new element */
4101 xfs_bmap_free_item_t *prev; /* previous element */
4102 #ifdef DEBUG
4103 xfs_agnumber_t agno;
4104 xfs_agblock_t agbno;
4105
4106 ASSERT(bno != NULLFSBLOCK);
4107 ASSERT(len > 0);
4108 ASSERT(len <= MAXEXTLEN);
4109 ASSERT(!ISNULLSTARTBLOCK(bno));
4110 agno = XFS_FSB_TO_AGNO(mp, bno);
4111 agbno = XFS_FSB_TO_AGBNO(mp, bno);
4112 ASSERT(agno < mp->m_sb.sb_agcount);
4113 ASSERT(agbno < mp->m_sb.sb_agblocks);
4114 ASSERT(len < mp->m_sb.sb_agblocks);
4115 ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
4116 #endif
4117 ASSERT(xfs_bmap_free_item_zone != NULL);
4118 new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
4119 new->xbfi_startblock = bno;
4120 new->xbfi_blockcount = (xfs_extlen_t)len;
4121 for (prev = NULL, cur = flist->xbf_first;
4122 cur != NULL;
4123 prev = cur, cur = cur->xbfi_next) {
4124 if (cur->xbfi_startblock >= bno)
4125 break;
4126 }
4127 if (prev)
4128 prev->xbfi_next = new;
4129 else
4130 flist->xbf_first = new;
4131 new->xbfi_next = cur;
4132 flist->xbf_count++;
4133 }
4134
4135 /*
4136 * Compute and fill in the value of the maximum depth of a bmap btree
4137 * in this filesystem. Done once, during mount.
4138 */
4139 void
4140 xfs_bmap_compute_maxlevels(
4141 xfs_mount_t *mp, /* file system mount structure */
4142 int whichfork) /* data or attr fork */
4143 {
4144 int level; /* btree level */
4145 uint maxblocks; /* max blocks at this level */
4146 uint maxleafents; /* max leaf entries possible */
4147 int maxrootrecs; /* max records in root block */
4148 int minleafrecs; /* min records in leaf block */
4149 int minnoderecs; /* min records in node block */
4150 int sz; /* root block size */
4151
4152 /*
4153 * The maximum number of extents in a file, hence the maximum
4154 * number of leaf entries, is controlled by the type of di_nextents
4155 * (a signed 32-bit number, xfs_extnum_t), or by di_anextents
4156 * (a signed 16-bit number, xfs_aextnum_t).
4157 */
4158 if (whichfork == XFS_DATA_FORK) {
4159 maxleafents = MAXEXTNUM;
4160 sz = (mp->m_flags & XFS_MOUNT_ATTR2) ?
4161 XFS_BMDR_SPACE_CALC(MINDBTPTRS) : mp->m_attroffset;
4162 } else {
4163 maxleafents = MAXAEXTNUM;
4164 sz = (mp->m_flags & XFS_MOUNT_ATTR2) ?
4165 XFS_BMDR_SPACE_CALC(MINABTPTRS) :
4166 mp->m_sb.sb_inodesize - mp->m_attroffset;
4167 }
4168 maxrootrecs = (int)XFS_BTREE_BLOCK_MAXRECS(sz, xfs_bmdr, 0);
4169 minleafrecs = mp->m_bmap_dmnr[0];
4170 minnoderecs = mp->m_bmap_dmnr[1];
4171 maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
4172 for (level = 1; maxblocks > 1; level++) {
4173 if (maxblocks <= maxrootrecs)
4174 maxblocks = 1;
4175 else
4176 maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
4177 }
4178 mp->m_bm_maxlevels[whichfork] = level;
4179 }
4180
4181 /*
4182 * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
4183 * caller. Frees all the extents that need freeing, which must be done
4184 * last due to locking considerations. We never free any extents in
4185 * the first transaction. This is to allow the caller to make the first
4186 * transaction a synchronous one so that the pointers to the data being
4187 * broken in this transaction will be permanent before the data is actually
4188 * freed. This is necessary to prevent blocks from being reallocated
4189 * and written to before the free and reallocation are actually permanent.
4190 * We do not just make the first transaction synchronous here, because
4191 * there are more efficient ways to gain the same protection in some cases
4192 * (see the file truncation code).
4193 *
4194 * Return 1 if the given transaction was committed and a new one
4195 * started, and 0 otherwise in the committed parameter.
4196 */
4197 /*ARGSUSED*/
4198 int /* error */
4199 xfs_bmap_finish(
4200 xfs_trans_t **tp, /* transaction pointer addr */
4201 xfs_bmap_free_t *flist, /* i/o: list extents to free */
4202 int *committed) /* xact committed or not */
4203 {
4204 xfs_efd_log_item_t *efd; /* extent free data */
4205 xfs_efi_log_item_t *efi; /* extent free intention */
4206 int error; /* error return value */
4207 xfs_bmap_free_item_t *free; /* free extent item */
4208 unsigned int logres; /* new log reservation */
4209 unsigned int logcount; /* new log count */
4210 xfs_mount_t *mp; /* filesystem mount structure */
4211 xfs_bmap_free_item_t *next; /* next item on free list */
4212 xfs_trans_t *ntp; /* new transaction pointer */
4213
4214 ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
4215 if (flist->xbf_count == 0) {
4216 *committed = 0;
4217 return 0;
4218 }
4219 ntp = *tp;
4220 efi = xfs_trans_get_efi(ntp, flist->xbf_count);
4221 for (free = flist->xbf_first; free; free = free->xbfi_next)
4222 xfs_trans_log_efi_extent(ntp, efi, free->xbfi_startblock,
4223 free->xbfi_blockcount);
4224 logres = ntp->t_log_res;
4225 logcount = ntp->t_log_count;
4226 ntp = xfs_trans_dup(*tp);
4227 error = xfs_trans_commit(*tp, 0);
4228 *tp = ntp;
4229 *committed = 1;
4230 /*
4231 * We have a new transaction, so we should return committed=1,
4232 * even though we're returning an error.
4233 */
4234 if (error) {
4235 return error;
4236 }
4237 if ((error = xfs_trans_reserve(ntp, 0, logres, 0, XFS_TRANS_PERM_LOG_RES,
4238 logcount)))
4239 return error;
4240 efd = xfs_trans_get_efd(ntp, efi, flist->xbf_count);
4241 for (free = flist->xbf_first; free != NULL; free = next) {
4242 next = free->xbfi_next;
4243 if ((error = xfs_free_extent(ntp, free->xbfi_startblock,
4244 free->xbfi_blockcount))) {
4245 /*
4246 * The bmap free list will be cleaned up at a
4247 * higher level. The EFI will be canceled when
4248 * this transaction is aborted.
4249 * Need to force shutdown here to make sure it
4250 * happens, since this transaction may not be
4251 * dirty yet.
4252 */
4253 mp = ntp->t_mountp;
4254 if (!XFS_FORCED_SHUTDOWN(mp))
4255 xfs_force_shutdown(mp,
4256 (error == EFSCORRUPTED) ?
4257 SHUTDOWN_CORRUPT_INCORE :
4258 SHUTDOWN_META_IO_ERROR);
4259 return error;
4260 }
4261 xfs_trans_log_efd_extent(ntp, efd, free->xbfi_startblock,
4262 free->xbfi_blockcount);
4263 xfs_bmap_del_free(flist, NULL, free);
4264 }
4265 return 0;
4266 }
4267
4268 /*
4269 * Free up any items left in the list.
4270 */
4271 void
4272 xfs_bmap_cancel(
4273 xfs_bmap_free_t *flist) /* list of bmap_free_items */
4274 {
4275 xfs_bmap_free_item_t *free; /* free list item */
4276 xfs_bmap_free_item_t *next;
4277
4278 if (flist->xbf_count == 0)
4279 return;
4280 ASSERT(flist->xbf_first != NULL);
4281 for (free = flist->xbf_first; free; free = next) {
4282 next = free->xbfi_next;
4283 xfs_bmap_del_free(flist, NULL, free);
4284 }
4285 ASSERT(flist->xbf_count == 0);
4286 }
4287
4288 /*
4289 * Returns the file-relative block number of the first unused block(s)
4290 * in the file with at least "len" logically contiguous blocks free.
4291 * This is the lowest-address hole if the file has holes, else the first block
4292 * past the end of file.
4293 * Return 0 if the file is currently local (in-inode).
4294 */
4295 int /* error */
4296 xfs_bmap_first_unused(
4297 xfs_trans_t *tp, /* transaction pointer */
4298 xfs_inode_t *ip, /* incore inode */
4299 xfs_extlen_t len, /* size of hole to find */
4300 xfs_fileoff_t *first_unused, /* unused block */
4301 int whichfork) /* data or attr fork */
4302 {
4303 int error; /* error return value */
4304 int idx; /* extent record index */
4305 xfs_ifork_t *ifp; /* inode fork pointer */
4306 xfs_fileoff_t lastaddr; /* last block number seen */
4307 xfs_fileoff_t lowest; /* lowest useful block */
4308 xfs_fileoff_t max; /* starting useful block */
4309 xfs_fileoff_t off; /* offset for this block */
4310 xfs_extnum_t nextents; /* number of extent entries */
4311
4312 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
4313 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
4314 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
4315 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4316 *first_unused = 0;
4317 return 0;
4318 }
4319 ifp = XFS_IFORK_PTR(ip, whichfork);
4320 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4321 (error = xfs_iread_extents(tp, ip, whichfork)))
4322 return error;
4323 lowest = *first_unused;
4324 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4325 for (idx = 0, lastaddr = 0, max = lowest; idx < nextents; idx++) {
4326 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
4327 off = xfs_bmbt_get_startoff(ep);
4328 /*
4329 * See if the hole before this extent will work.
4330 */
4331 if (off >= lowest + len && off - max >= len) {
4332 *first_unused = max;
4333 return 0;
4334 }
4335 lastaddr = off + xfs_bmbt_get_blockcount(ep);
4336 max = XFS_FILEOFF_MAX(lastaddr, lowest);
4337 }
4338 *first_unused = max;
4339 return 0;
4340 }
4341
4342 /*
4343 * Returns the file-relative block number of the last block + 1 before
4344 * last_block (input value) in the file.
4345 * This is not based on i_size, it is based on the extent records.
4346 * Returns 0 for local files, as they do not have extent records.
4347 */
4348 int /* error */
4349 xfs_bmap_last_before(
4350 xfs_trans_t *tp, /* transaction pointer */
4351 xfs_inode_t *ip, /* incore inode */
4352 xfs_fileoff_t *last_block, /* last block */
4353 int whichfork) /* data or attr fork */
4354 {
4355 xfs_fileoff_t bno; /* input file offset */
4356 int eof; /* hit end of file */
4357 xfs_bmbt_rec_host_t *ep; /* pointer to last extent */
4358 int error; /* error return value */
4359 xfs_bmbt_irec_t got; /* current extent value */
4360 xfs_ifork_t *ifp; /* inode fork pointer */
4361 xfs_extnum_t lastx; /* last extent used */
4362 xfs_bmbt_irec_t prev; /* previous extent value */
4363
4364 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4365 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4366 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
4367 return XFS_ERROR(EIO);
4368 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4369 *last_block = 0;
4370 return 0;
4371 }
4372 ifp = XFS_IFORK_PTR(ip, whichfork);
4373 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4374 (error = xfs_iread_extents(tp, ip, whichfork)))
4375 return error;
4376 bno = *last_block - 1;
4377 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
4378 &prev);
4379 if (eof || xfs_bmbt_get_startoff(ep) > bno) {
4380 if (prev.br_startoff == NULLFILEOFF)
4381 *last_block = 0;
4382 else
4383 *last_block = prev.br_startoff + prev.br_blockcount;
4384 }
4385 /*
4386 * Otherwise *last_block is already the right answer.
4387 */
4388 return 0;
4389 }
4390
4391 /*
4392 * Returns the file-relative block number of the first block past eof in
4393 * the file. This is not based on i_size, it is based on the extent records.
4394 * Returns 0 for local files, as they do not have extent records.
4395 */
4396 int /* error */
4397 xfs_bmap_last_offset(
4398 xfs_trans_t *tp, /* transaction pointer */
4399 xfs_inode_t *ip, /* incore inode */
4400 xfs_fileoff_t *last_block, /* last block */
4401 int whichfork) /* data or attr fork */
4402 {
4403 xfs_bmbt_rec_host_t *ep; /* pointer to last extent */
4404 int error; /* error return value */
4405 xfs_ifork_t *ifp; /* inode fork pointer */
4406 xfs_extnum_t nextents; /* number of extent entries */
4407
4408 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4409 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4410 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
4411 return XFS_ERROR(EIO);
4412 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4413 *last_block = 0;
4414 return 0;
4415 }
4416 ifp = XFS_IFORK_PTR(ip, whichfork);
4417 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4418 (error = xfs_iread_extents(tp, ip, whichfork)))
4419 return error;
4420 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4421 if (!nextents) {
4422 *last_block = 0;
4423 return 0;
4424 }
4425 ep = xfs_iext_get_ext(ifp, nextents - 1);
4426 *last_block = xfs_bmbt_get_startoff(ep) + xfs_bmbt_get_blockcount(ep);
4427 return 0;
4428 }
4429
4430 /*
4431 * Returns whether the selected fork of the inode has exactly one
4432 * block or not. For the data fork we check this matches di_size,
4433 * implying the file's range is 0..bsize-1.
4434 */
4435 int /* 1=>1 block, 0=>otherwise */
4436 xfs_bmap_one_block(
4437 xfs_inode_t *ip, /* incore inode */
4438 int whichfork) /* data or attr fork */
4439 {
4440 xfs_bmbt_rec_host_t *ep; /* ptr to fork's extent */
4441 xfs_ifork_t *ifp; /* inode fork pointer */
4442 int rval; /* return value */
4443 xfs_bmbt_irec_t s; /* internal version of extent */
4444
4445 #ifndef DEBUG
4446 if (whichfork == XFS_DATA_FORK) {
4447 return ((ip->i_d.di_mode & S_IFMT) == S_IFREG) ?
4448 (ip->i_size == ip->i_mount->m_sb.sb_blocksize) :
4449 (ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize);
4450 }
4451 #endif /* !DEBUG */
4452 if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
4453 return 0;
4454 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
4455 return 0;
4456 ifp = XFS_IFORK_PTR(ip, whichfork);
4457 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
4458 ep = xfs_iext_get_ext(ifp, 0);
4459 xfs_bmbt_get_all(ep, &s);
4460 rval = s.br_startoff == 0 && s.br_blockcount == 1;
4461 if (rval && whichfork == XFS_DATA_FORK)
4462 ASSERT(ip->i_size == ip->i_mount->m_sb.sb_blocksize);
4463 return rval;
4464 }
4465
4466 /*
4467 * Read in the extents to if_extents.
4468 * All inode fields are set up by caller, we just traverse the btree
4469 * and copy the records in. If the file system cannot contain unwritten
4470 * extents, the records are checked for no "state" flags.
4471 */
4472 int /* error */
4473 xfs_bmap_read_extents(
4474 xfs_trans_t *tp, /* transaction pointer */
4475 xfs_inode_t *ip, /* incore inode */
4476 int whichfork) /* data or attr fork */
4477 {
4478 xfs_bmbt_block_t *block; /* current btree block */
4479 xfs_fsblock_t bno; /* block # of "block" */
4480 xfs_buf_t *bp; /* buffer for "block" */
4481 int error; /* error return value */
4482 xfs_exntfmt_t exntf; /* XFS_EXTFMT_NOSTATE, if checking */
4483 xfs_extnum_t i, j; /* index into the extents list */
4484 xfs_ifork_t *ifp; /* fork structure */
4485 int level; /* btree level, for checking */
4486 xfs_mount_t *mp; /* file system mount structure */
4487 __be64 *pp; /* pointer to block address */
4488 /* REFERENCED */
4489 xfs_extnum_t room; /* number of entries there's room for */
4490
4491 bno = NULLFSBLOCK;
4492 mp = ip->i_mount;
4493 ifp = XFS_IFORK_PTR(ip, whichfork);
4494 exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE :
4495 XFS_EXTFMT_INODE(ip);
4496 block = ifp->if_broot;
4497 /*
4498 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
4499 */
4500 level = be16_to_cpu(block->bb_level);
4501 ASSERT(level > 0);
4502 pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
4503 bno = be64_to_cpu(*pp);
4504 ASSERT(bno != NULLDFSBNO);
4505 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
4506 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
4507 /*
4508 * Go down the tree until leaf level is reached, following the first
4509 * pointer (leftmost) at each level.
4510 */
4511 while (level-- > 0) {
4512 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4513 XFS_BMAP_BTREE_REF)))
4514 return error;
4515 block = XFS_BUF_TO_BMBT_BLOCK(bp);
4516 XFS_WANT_CORRUPTED_GOTO(
4517 XFS_BMAP_SANITY_CHECK(mp, block, level),
4518 error0);
4519 if (level == 0)
4520 break;
4521 pp = XFS_BTREE_PTR_ADDR(xfs_bmbt, block, 1, mp->m_bmap_dmxr[1]);
4522 bno = be64_to_cpu(*pp);
4523 XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
4524 xfs_trans_brelse(tp, bp);
4525 }
4526 /*
4527 * Here with bp and block set to the leftmost leaf node in the tree.
4528 */
4529 room = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4530 i = 0;
4531 /*
4532 * Loop over all leaf nodes. Copy information to the extent records.
4533 */
4534 for (;;) {
4535 xfs_bmbt_rec_t *frp;
4536 xfs_fsblock_t nextbno;
4537 xfs_extnum_t num_recs;
4538 xfs_extnum_t start;
4539
4540
4541 num_recs = be16_to_cpu(block->bb_numrecs);
4542 if (unlikely(i + num_recs > room)) {
4543 ASSERT(i + num_recs <= room);
4544 xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
4545 "corrupt dinode %Lu, (btree extents).",
4546 (unsigned long long) ip->i_ino);
4547 XFS_ERROR_REPORT("xfs_bmap_read_extents(1)",
4548 XFS_ERRLEVEL_LOW,
4549 ip->i_mount);
4550 goto error0;
4551 }
4552 XFS_WANT_CORRUPTED_GOTO(
4553 XFS_BMAP_SANITY_CHECK(mp, block, 0),
4554 error0);
4555 /*
4556 * Read-ahead the next leaf block, if any.
4557 */
4558 nextbno = be64_to_cpu(block->bb_rightsib);
4559 if (nextbno != NULLFSBLOCK)
4560 xfs_btree_reada_bufl(mp, nextbno, 1);
4561 /*
4562 * Copy records into the extent records.
4563 */
4564 frp = XFS_BTREE_REC_ADDR(xfs_bmbt, block, 1);
4565 start = i;
4566 for (j = 0; j < num_recs; j++, i++, frp++) {
4567 xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i);
4568 trp->l0 = be64_to_cpu(frp->l0);
4569 trp->l1 = be64_to_cpu(frp->l1);
4570 }
4571 if (exntf == XFS_EXTFMT_NOSTATE) {
4572 /*
4573 * Check all attribute bmap btree records and
4574 * any "older" data bmap btree records for a
4575 * set bit in the "extent flag" position.
4576 */
4577 if (unlikely(xfs_check_nostate_extents(ifp,
4578 start, num_recs))) {
4579 XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
4580 XFS_ERRLEVEL_LOW,
4581 ip->i_mount);
4582 goto error0;
4583 }
4584 }
4585 xfs_trans_brelse(tp, bp);
4586 bno = nextbno;
4587 /*
4588 * If we've reached the end, stop.
4589 */
4590 if (bno == NULLFSBLOCK)
4591 break;
4592 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4593 XFS_BMAP_BTREE_REF)))
4594 return error;
4595 block = XFS_BUF_TO_BMBT_BLOCK(bp);
4596 }
4597 ASSERT(i == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
4598 ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork));
4599 XFS_BMAP_TRACE_EXLIST(ip, i, whichfork);
4600 return 0;
4601 error0:
4602 xfs_trans_brelse(tp, bp);
4603 return XFS_ERROR(EFSCORRUPTED);
4604 }
4605
4606 #ifdef XFS_BMAP_TRACE
4607 /*
4608 * Add bmap trace insert entries for all the contents of the extent records.
4609 */
4610 void
4611 xfs_bmap_trace_exlist(
4612 const char *fname, /* function name */
4613 xfs_inode_t *ip, /* incore inode pointer */
4614 xfs_extnum_t cnt, /* count of entries in the list */
4615 int whichfork) /* data or attr fork */
4616 {
4617 xfs_bmbt_rec_host_t *ep; /* current extent record */
4618 xfs_extnum_t idx; /* extent record index */
4619 xfs_ifork_t *ifp; /* inode fork pointer */
4620 xfs_bmbt_irec_t s; /* file extent record */
4621
4622 ifp = XFS_IFORK_PTR(ip, whichfork);
4623 ASSERT(cnt == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
4624 for (idx = 0; idx < cnt; idx++) {
4625 ep = xfs_iext_get_ext(ifp, idx);
4626 xfs_bmbt_get_all(ep, &s);
4627 XFS_BMAP_TRACE_INSERT("exlist", ip, idx, 1, &s, NULL,
4628 whichfork);
4629 }
4630 }
4631 #endif
4632
4633 #ifdef DEBUG
4634 /*
4635 * Validate that the bmbt_irecs being returned from bmapi are valid
4636 * given the callers original parameters. Specifically check the
4637 * ranges of the returned irecs to ensure that they only extent beyond
4638 * the given parameters if the XFS_BMAPI_ENTIRE flag was set.
4639 */
4640 STATIC void
4641 xfs_bmap_validate_ret(
4642 xfs_fileoff_t bno,
4643 xfs_filblks_t len,
4644 int flags,
4645 xfs_bmbt_irec_t *mval,
4646 int nmap,
4647 int ret_nmap)
4648 {
4649 int i; /* index to map values */
4650
4651 ASSERT(ret_nmap <= nmap);
4652
4653 for (i = 0; i < ret_nmap; i++) {
4654 ASSERT(mval[i].br_blockcount > 0);
4655 if (!(flags & XFS_BMAPI_ENTIRE)) {
4656 ASSERT(mval[i].br_startoff >= bno);
4657 ASSERT(mval[i].br_blockcount <= len);
4658 ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
4659 bno + len);
4660 } else {
4661 ASSERT(mval[i].br_startoff < bno + len);
4662 ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
4663 bno);
4664 }
4665 ASSERT(i == 0 ||
4666 mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
4667 mval[i].br_startoff);
4668 if ((flags & XFS_BMAPI_WRITE) && !(flags & XFS_BMAPI_DELAY))
4669 ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
4670 mval[i].br_startblock != HOLESTARTBLOCK);
4671 ASSERT(mval[i].br_state == XFS_EXT_NORM ||
4672 mval[i].br_state == XFS_EXT_UNWRITTEN);
4673 }
4674 }
4675 #endif /* DEBUG */
4676
4677
4678 /*
4679 * Map file blocks to filesystem blocks.
4680 * File range is given by the bno/len pair.
4681 * Adds blocks to file if a write ("flags & XFS_BMAPI_WRITE" set)
4682 * into a hole or past eof.
4683 * Only allocates blocks from a single allocation group,
4684 * to avoid locking problems.
4685 * The returned value in "firstblock" from the first call in a transaction
4686 * must be remembered and presented to subsequent calls in "firstblock".
4687 * An upper bound for the number of blocks to be allocated is supplied to
4688 * the first call in "total"; if no allocation group has that many free
4689 * blocks then the call will fail (return NULLFSBLOCK in "firstblock").
4690 */
4691 int /* error */
4692 xfs_bmapi(
4693 xfs_trans_t *tp, /* transaction pointer */
4694 xfs_inode_t *ip, /* incore inode */
4695 xfs_fileoff_t bno, /* starting file offs. mapped */
4696 xfs_filblks_t len, /* length to map in file */
4697 int flags, /* XFS_BMAPI_... */
4698 xfs_fsblock_t *firstblock, /* first allocated block
4699 controls a.g. for allocs */
4700 xfs_extlen_t total, /* total blocks needed */
4701 xfs_bmbt_irec_t *mval, /* output: map values */
4702 int *nmap, /* i/o: mval size/count */
4703 xfs_bmap_free_t *flist, /* i/o: list extents to free */
4704 xfs_extdelta_t *delta) /* o: change made to incore extents */
4705 {
4706 xfs_fsblock_t abno; /* allocated block number */
4707 xfs_extlen_t alen; /* allocated extent length */
4708 xfs_fileoff_t aoff; /* allocated file offset */
4709 xfs_bmalloca_t bma; /* args for xfs_bmap_alloc */
4710 xfs_btree_cur_t *cur; /* bmap btree cursor */
4711 xfs_fileoff_t end; /* end of mapped file region */
4712 int eof; /* we've hit the end of extents */
4713 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
4714 int error; /* error return */
4715 xfs_bmbt_irec_t got; /* current file extent record */
4716 xfs_ifork_t *ifp; /* inode fork pointer */
4717 xfs_extlen_t indlen; /* indirect blocks length */
4718 xfs_extnum_t lastx; /* last useful extent number */
4719 int logflags; /* flags for transaction logging */
4720 xfs_extlen_t minleft; /* min blocks left after allocation */
4721 xfs_extlen_t minlen; /* min allocation size */
4722 xfs_mount_t *mp; /* xfs mount structure */
4723 int n; /* current extent index */
4724 int nallocs; /* number of extents alloc\'d */
4725 xfs_extnum_t nextents; /* number of extents in file */
4726 xfs_fileoff_t obno; /* old block number (offset) */
4727 xfs_bmbt_irec_t prev; /* previous file extent record */
4728 int tmp_logflags; /* temp flags holder */
4729 int whichfork; /* data or attr fork */
4730 char inhole; /* current location is hole in file */
4731 char wasdelay; /* old extent was delayed */
4732 char wr; /* this is a write request */
4733 char rt; /* this is a realtime file */
4734 #ifdef DEBUG
4735 xfs_fileoff_t orig_bno; /* original block number value */
4736 int orig_flags; /* original flags arg value */
4737 xfs_filblks_t orig_len; /* original value of len arg */
4738 xfs_bmbt_irec_t *orig_mval; /* original value of mval */
4739 int orig_nmap; /* original value of *nmap */
4740
4741 orig_bno = bno;
4742 orig_len = len;
4743 orig_flags = flags;
4744 orig_mval = mval;
4745 orig_nmap = *nmap;
4746 #endif
4747 ASSERT(*nmap >= 1);
4748 ASSERT(*nmap <= XFS_BMAP_MAX_NMAP || !(flags & XFS_BMAPI_WRITE));
4749 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4750 XFS_ATTR_FORK : XFS_DATA_FORK;
4751 mp = ip->i_mount;
4752 if (unlikely(XFS_TEST_ERROR(
4753 (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4754 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4755 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL),
4756 mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
4757 XFS_ERROR_REPORT("xfs_bmapi", XFS_ERRLEVEL_LOW, mp);
4758 return XFS_ERROR(EFSCORRUPTED);
4759 }
4760 if (XFS_FORCED_SHUTDOWN(mp))
4761 return XFS_ERROR(EIO);
4762 rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
4763 ifp = XFS_IFORK_PTR(ip, whichfork);
4764 ASSERT(ifp->if_ext_max ==
4765 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
4766 if ((wr = (flags & XFS_BMAPI_WRITE)) != 0)
4767 XFS_STATS_INC(xs_blk_mapw);
4768 else
4769 XFS_STATS_INC(xs_blk_mapr);
4770 /*
4771 * IGSTATE flag is used to combine extents which
4772 * differ only due to the state of the extents.
4773 * This technique is used from xfs_getbmap()
4774 * when the caller does not wish to see the
4775 * separation (which is the default).
4776 *
4777 * This technique is also used when writing a
4778 * buffer which has been partially written,
4779 * (usually by being flushed during a chunkread),
4780 * to ensure one write takes place. This also
4781 * prevents a change in the xfs inode extents at
4782 * this time, intentionally. This change occurs
4783 * on completion of the write operation, in
4784 * xfs_strat_comp(), where the xfs_bmapi() call
4785 * is transactioned, and the extents combined.
4786 */
4787 if ((flags & XFS_BMAPI_IGSTATE) && wr) /* if writing unwritten space */
4788 wr = 0; /* no allocations are allowed */
4789 ASSERT(wr || !(flags & XFS_BMAPI_DELAY));
4790 logflags = 0;
4791 nallocs = 0;
4792 cur = NULL;
4793 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4794 ASSERT(wr && tp);
4795 if ((error = xfs_bmap_local_to_extents(tp, ip,
4796 firstblock, total, &logflags, whichfork)))
4797 goto error0;
4798 }
4799 if (wr && *firstblock == NULLFSBLOCK) {
4800 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
4801 minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1;
4802 else
4803 minleft = 1;
4804 } else
4805 minleft = 0;
4806 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4807 (error = xfs_iread_extents(tp, ip, whichfork)))
4808 goto error0;
4809 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
4810 &prev);
4811 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4812 n = 0;
4813 end = bno + len;
4814 obno = bno;
4815 bma.ip = NULL;
4816 if (delta) {
4817 delta->xed_startoff = NULLFILEOFF;
4818 delta->xed_blockcount = 0;
4819 }
4820 while (bno < end && n < *nmap) {
4821 /*
4822 * Reading past eof, act as though there's a hole
4823 * up to end.
4824 */
4825 if (eof && !wr)
4826 got.br_startoff = end;
4827 inhole = eof || got.br_startoff > bno;
4828 wasdelay = wr && !inhole && !(flags & XFS_BMAPI_DELAY) &&
4829 ISNULLSTARTBLOCK(got.br_startblock);
4830 /*
4831 * First, deal with the hole before the allocated space
4832 * that we found, if any.
4833 */
4834 if (wr && (inhole || wasdelay)) {
4835 /*
4836 * For the wasdelay case, we could also just
4837 * allocate the stuff asked for in this bmap call
4838 * but that wouldn't be as good.
4839 */
4840 if (wasdelay && !(flags & XFS_BMAPI_EXACT)) {
4841 alen = (xfs_extlen_t)got.br_blockcount;
4842 aoff = got.br_startoff;
4843 if (lastx != NULLEXTNUM && lastx) {
4844 ep = xfs_iext_get_ext(ifp, lastx - 1);
4845 xfs_bmbt_get_all(ep, &prev);
4846 }
4847 } else if (wasdelay) {
4848 alen = (xfs_extlen_t)
4849 XFS_FILBLKS_MIN(len,
4850 (got.br_startoff +
4851 got.br_blockcount) - bno);
4852 aoff = bno;
4853 } else {
4854 alen = (xfs_extlen_t)
4855 XFS_FILBLKS_MIN(len, MAXEXTLEN);
4856 if (!eof)
4857 alen = (xfs_extlen_t)
4858 XFS_FILBLKS_MIN(alen,
4859 got.br_startoff - bno);
4860 aoff = bno;
4861 }
4862 minlen = (flags & XFS_BMAPI_CONTIG) ? alen : 1;
4863 if (flags & XFS_BMAPI_DELAY) {
4864 xfs_extlen_t extsz;
4865
4866 /* Figure out the extent size, adjust alen */
4867 extsz = xfs_get_extsz_hint(ip);
4868 if (extsz) {
4869 error = xfs_bmap_extsize_align(mp,
4870 &got, &prev, extsz,
4871 rt, eof,
4872 flags&XFS_BMAPI_DELAY,
4873 flags&XFS_BMAPI_CONVERT,
4874 &aoff, &alen);
4875 ASSERT(!error);
4876 }
4877
4878 if (rt)
4879 extsz = alen / mp->m_sb.sb_rextsize;
4880
4881 /*
4882 * Make a transaction-less quota reservation for
4883 * delayed allocation blocks. This number gets
4884 * adjusted later. We return if we haven't
4885 * allocated blocks already inside this loop.
4886 */
4887 if ((error = XFS_TRANS_RESERVE_QUOTA_NBLKS(
4888 mp, NULL, ip, (long)alen, 0,
4889 rt ? XFS_QMOPT_RES_RTBLKS :
4890 XFS_QMOPT_RES_REGBLKS))) {
4891 if (n == 0) {
4892 *nmap = 0;
4893 ASSERT(cur == NULL);
4894 return error;
4895 }
4896 break;
4897 }
4898
4899 /*
4900 * Split changing sb for alen and indlen since
4901 * they could be coming from different places.
4902 */
4903 indlen = (xfs_extlen_t)
4904 xfs_bmap_worst_indlen(ip, alen);
4905 ASSERT(indlen > 0);
4906
4907 if (rt) {
4908 error = xfs_mod_incore_sb(mp,
4909 XFS_SBS_FREXTENTS,
4910 -((int64_t)extsz), (flags &
4911 XFS_BMAPI_RSVBLOCKS));
4912 } else {
4913 error = xfs_mod_incore_sb(mp,
4914 XFS_SBS_FDBLOCKS,
4915 -((int64_t)alen), (flags &
4916 XFS_BMAPI_RSVBLOCKS));
4917 }
4918 if (!error) {
4919 error = xfs_mod_incore_sb(mp,
4920 XFS_SBS_FDBLOCKS,
4921 -((int64_t)indlen), (flags &
4922 XFS_BMAPI_RSVBLOCKS));
4923 if (error && rt)
4924 xfs_mod_incore_sb(mp,
4925 XFS_SBS_FREXTENTS,
4926 (int64_t)extsz, (flags &
4927 XFS_BMAPI_RSVBLOCKS));
4928 else if (error)
4929 xfs_mod_incore_sb(mp,
4930 XFS_SBS_FDBLOCKS,
4931 (int64_t)alen, (flags &
4932 XFS_BMAPI_RSVBLOCKS));
4933 }
4934
4935 if (error) {
4936 if (XFS_IS_QUOTA_ON(mp))
4937 /* unreserve the blocks now */
4938 (void)
4939 XFS_TRANS_UNRESERVE_QUOTA_NBLKS(
4940 mp, NULL, ip,
4941 (long)alen, 0, rt ?
4942 XFS_QMOPT_RES_RTBLKS :
4943 XFS_QMOPT_RES_REGBLKS);
4944 break;
4945 }
4946
4947 ip->i_delayed_blks += alen;
4948 abno = NULLSTARTBLOCK(indlen);
4949 } else {
4950 /*
4951 * If first time, allocate and fill in
4952 * once-only bma fields.
4953 */
4954 if (bma.ip == NULL) {
4955 bma.tp = tp;
4956 bma.ip = ip;
4957 bma.prevp = &prev;
4958 bma.gotp = &got;
4959 bma.total = total;
4960 bma.userdata = 0;
4961 }
4962 /* Indicate if this is the first user data
4963 * in the file, or just any user data.
4964 */
4965 if (!(flags & XFS_BMAPI_METADATA)) {
4966 bma.userdata = (aoff == 0) ?
4967 XFS_ALLOC_INITIAL_USER_DATA :
4968 XFS_ALLOC_USERDATA;
4969 }
4970 /*
4971 * Fill in changeable bma fields.
4972 */
4973 bma.eof = eof;
4974 bma.firstblock = *firstblock;
4975 bma.alen = alen;
4976 bma.off = aoff;
4977 bma.conv = !!(flags & XFS_BMAPI_CONVERT);
4978 bma.wasdel = wasdelay;
4979 bma.minlen = minlen;
4980 bma.low = flist->xbf_low;
4981 bma.minleft = minleft;
4982 /*
4983 * Only want to do the alignment at the
4984 * eof if it is userdata and allocation length
4985 * is larger than a stripe unit.
4986 */
4987 if (mp->m_dalign && alen >= mp->m_dalign &&
4988 (!(flags & XFS_BMAPI_METADATA)) &&
4989 (whichfork == XFS_DATA_FORK)) {
4990 if ((error = xfs_bmap_isaeof(ip, aoff,
4991 whichfork, &bma.aeof)))
4992 goto error0;
4993 } else
4994 bma.aeof = 0;
4995 /*
4996 * Call allocator.
4997 */
4998 if ((error = xfs_bmap_alloc(&bma)))
4999 goto error0;
5000 /*
5001 * Copy out result fields.
5002 */
5003 abno = bma.rval;
5004 if ((flist->xbf_low = bma.low))
5005 minleft = 0;
5006 alen = bma.alen;
5007 aoff = bma.off;
5008 ASSERT(*firstblock == NULLFSBLOCK ||
5009 XFS_FSB_TO_AGNO(mp, *firstblock) ==
5010 XFS_FSB_TO_AGNO(mp, bma.firstblock) ||
5011 (flist->xbf_low &&
5012 XFS_FSB_TO_AGNO(mp, *firstblock) <
5013 XFS_FSB_TO_AGNO(mp, bma.firstblock)));
5014 *firstblock = bma.firstblock;
5015 if (cur)
5016 cur->bc_private.b.firstblock =
5017 *firstblock;
5018 if (abno == NULLFSBLOCK)
5019 break;
5020 if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
5021 cur = xfs_btree_init_cursor(mp,
5022 tp, NULL, 0, XFS_BTNUM_BMAP,
5023 ip, whichfork);
5024 cur->bc_private.b.firstblock =
5025 *firstblock;
5026 cur->bc_private.b.flist = flist;
5027 }
5028 /*
5029 * Bump the number of extents we've allocated
5030 * in this call.
5031 */
5032 nallocs++;
5033 }
5034 if (cur)
5035 cur->bc_private.b.flags =
5036 wasdelay ? XFS_BTCUR_BPRV_WASDEL : 0;
5037 got.br_startoff = aoff;
5038 got.br_startblock = abno;
5039 got.br_blockcount = alen;
5040 got.br_state = XFS_EXT_NORM; /* assume normal */
5041 /*
5042 * Determine state of extent, and the filesystem.
5043 * A wasdelay extent has been initialized, so
5044 * shouldn't be flagged as unwritten.
5045 */
5046 if (wr && xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5047 if (!wasdelay && (flags & XFS_BMAPI_PREALLOC))
5048 got.br_state = XFS_EXT_UNWRITTEN;
5049 }
5050 error = xfs_bmap_add_extent(ip, lastx, &cur, &got,
5051 firstblock, flist, &tmp_logflags, delta,
5052 whichfork, (flags & XFS_BMAPI_RSVBLOCKS));
5053 logflags |= tmp_logflags;
5054 if (error)
5055 goto error0;
5056 lastx = ifp->if_lastex;
5057 ep = xfs_iext_get_ext(ifp, lastx);
5058 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5059 xfs_bmbt_get_all(ep, &got);
5060 ASSERT(got.br_startoff <= aoff);
5061 ASSERT(got.br_startoff + got.br_blockcount >=
5062 aoff + alen);
5063 #ifdef DEBUG
5064 if (flags & XFS_BMAPI_DELAY) {
5065 ASSERT(ISNULLSTARTBLOCK(got.br_startblock));
5066 ASSERT(STARTBLOCKVAL(got.br_startblock) > 0);
5067 }
5068 ASSERT(got.br_state == XFS_EXT_NORM ||
5069 got.br_state == XFS_EXT_UNWRITTEN);
5070 #endif
5071 /*
5072 * Fall down into the found allocated space case.
5073 */
5074 } else if (inhole) {
5075 /*
5076 * Reading in a hole.
5077 */
5078 mval->br_startoff = bno;
5079 mval->br_startblock = HOLESTARTBLOCK;
5080 mval->br_blockcount =
5081 XFS_FILBLKS_MIN(len, got.br_startoff - bno);
5082 mval->br_state = XFS_EXT_NORM;
5083 bno += mval->br_blockcount;
5084 len -= mval->br_blockcount;
5085 mval++;
5086 n++;
5087 continue;
5088 }
5089 /*
5090 * Then deal with the allocated space we found.
5091 */
5092 ASSERT(ep != NULL);
5093 if (!(flags & XFS_BMAPI_ENTIRE) &&
5094 (got.br_startoff + got.br_blockcount > obno)) {
5095 if (obno > bno)
5096 bno = obno;
5097 ASSERT((bno >= obno) || (n == 0));
5098 ASSERT(bno < end);
5099 mval->br_startoff = bno;
5100 if (ISNULLSTARTBLOCK(got.br_startblock)) {
5101 ASSERT(!wr || (flags & XFS_BMAPI_DELAY));
5102 mval->br_startblock = DELAYSTARTBLOCK;
5103 } else
5104 mval->br_startblock =
5105 got.br_startblock +
5106 (bno - got.br_startoff);
5107 /*
5108 * Return the minimum of what we got and what we
5109 * asked for for the length. We can use the len
5110 * variable here because it is modified below
5111 * and we could have been there before coming
5112 * here if the first part of the allocation
5113 * didn't overlap what was asked for.
5114 */
5115 mval->br_blockcount =
5116 XFS_FILBLKS_MIN(end - bno, got.br_blockcount -
5117 (bno - got.br_startoff));
5118 mval->br_state = got.br_state;
5119 ASSERT(mval->br_blockcount <= len);
5120 } else {
5121 *mval = got;
5122 if (ISNULLSTARTBLOCK(mval->br_startblock)) {
5123 ASSERT(!wr || (flags & XFS_BMAPI_DELAY));
5124 mval->br_startblock = DELAYSTARTBLOCK;
5125 }
5126 }
5127
5128 /*
5129 * Check if writing previously allocated but
5130 * unwritten extents.
5131 */
5132 if (wr && mval->br_state == XFS_EXT_UNWRITTEN &&
5133 ((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_DELAY)) == 0)) {
5134 /*
5135 * Modify (by adding) the state flag, if writing.
5136 */
5137 ASSERT(mval->br_blockcount <= len);
5138 if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
5139 cur = xfs_btree_init_cursor(mp,
5140 tp, NULL, 0, XFS_BTNUM_BMAP,
5141 ip, whichfork);
5142 cur->bc_private.b.firstblock =
5143 *firstblock;
5144 cur->bc_private.b.flist = flist;
5145 }
5146 mval->br_state = XFS_EXT_NORM;
5147 error = xfs_bmap_add_extent(ip, lastx, &cur, mval,
5148 firstblock, flist, &tmp_logflags, delta,
5149 whichfork, (flags & XFS_BMAPI_RSVBLOCKS));
5150 logflags |= tmp_logflags;
5151 if (error)
5152 goto error0;
5153 lastx = ifp->if_lastex;
5154 ep = xfs_iext_get_ext(ifp, lastx);
5155 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5156 xfs_bmbt_get_all(ep, &got);
5157 /*
5158 * We may have combined previously unwritten
5159 * space with written space, so generate
5160 * another request.
5161 */
5162 if (mval->br_blockcount < len)
5163 continue;
5164 }
5165
5166 ASSERT((flags & XFS_BMAPI_ENTIRE) ||
5167 ((mval->br_startoff + mval->br_blockcount) <= end));
5168 ASSERT((flags & XFS_BMAPI_ENTIRE) ||
5169 (mval->br_blockcount <= len) ||
5170 (mval->br_startoff < obno));
5171 bno = mval->br_startoff + mval->br_blockcount;
5172 len = end - bno;
5173 if (n > 0 && mval->br_startoff == mval[-1].br_startoff) {
5174 ASSERT(mval->br_startblock == mval[-1].br_startblock);
5175 ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
5176 ASSERT(mval->br_state == mval[-1].br_state);
5177 mval[-1].br_blockcount = mval->br_blockcount;
5178 mval[-1].br_state = mval->br_state;
5179 } else if (n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
5180 mval[-1].br_startblock != DELAYSTARTBLOCK &&
5181 mval[-1].br_startblock != HOLESTARTBLOCK &&
5182 mval->br_startblock ==
5183 mval[-1].br_startblock + mval[-1].br_blockcount &&
5184 ((flags & XFS_BMAPI_IGSTATE) ||
5185 mval[-1].br_state == mval->br_state)) {
5186 ASSERT(mval->br_startoff ==
5187 mval[-1].br_startoff + mval[-1].br_blockcount);
5188 mval[-1].br_blockcount += mval->br_blockcount;
5189 } else if (n > 0 &&
5190 mval->br_startblock == DELAYSTARTBLOCK &&
5191 mval[-1].br_startblock == DELAYSTARTBLOCK &&
5192 mval->br_startoff ==
5193 mval[-1].br_startoff + mval[-1].br_blockcount) {
5194 mval[-1].br_blockcount += mval->br_blockcount;
5195 mval[-1].br_state = mval->br_state;
5196 } else if (!((n == 0) &&
5197 ((mval->br_startoff + mval->br_blockcount) <=
5198 obno))) {
5199 mval++;
5200 n++;
5201 }
5202 /*
5203 * If we're done, stop now. Stop when we've allocated
5204 * XFS_BMAP_MAX_NMAP extents no matter what. Otherwise
5205 * the transaction may get too big.
5206 */
5207 if (bno >= end || n >= *nmap || nallocs >= *nmap)
5208 break;
5209 /*
5210 * Else go on to the next record.
5211 */
5212 ep = xfs_iext_get_ext(ifp, ++lastx);
5213 prev = got;
5214 if (lastx >= nextents)
5215 eof = 1;
5216 else
5217 xfs_bmbt_get_all(ep, &got);
5218 }
5219 ifp->if_lastex = lastx;
5220 *nmap = n;
5221 /*
5222 * Transform from btree to extents, give it cur.
5223 */
5224 if (tp && XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
5225 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
5226 ASSERT(wr && cur);
5227 error = xfs_bmap_btree_to_extents(tp, ip, cur,
5228 &tmp_logflags, whichfork);
5229 logflags |= tmp_logflags;
5230 if (error)
5231 goto error0;
5232 }
5233 ASSERT(ifp->if_ext_max ==
5234 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5235 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
5236 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max);
5237 error = 0;
5238 if (delta && delta->xed_startoff != NULLFILEOFF) {
5239 /* A change was actually made.
5240 * Note that delta->xed_blockount is an offset at this
5241 * point and needs to be converted to a block count.
5242 */
5243 ASSERT(delta->xed_blockcount > delta->xed_startoff);
5244 delta->xed_blockcount -= delta->xed_startoff;
5245 }
5246 error0:
5247 /*
5248 * Log everything. Do this after conversion, there's no point in
5249 * logging the extent records if we've converted to btree format.
5250 */
5251 if ((logflags & XFS_ILOG_FEXT(whichfork)) &&
5252 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5253 logflags &= ~XFS_ILOG_FEXT(whichfork);
5254 else if ((logflags & XFS_ILOG_FBROOT(whichfork)) &&
5255 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5256 logflags &= ~XFS_ILOG_FBROOT(whichfork);
5257 /*
5258 * Log whatever the flags say, even if error. Otherwise we might miss
5259 * detecting a case where the data is changed, there's an error,
5260 * and it's not logged so we don't shutdown when we should.
5261 */
5262 if (logflags) {
5263 ASSERT(tp && wr);
5264 xfs_trans_log_inode(tp, ip, logflags);
5265 }
5266 if (cur) {
5267 if (!error) {
5268 ASSERT(*firstblock == NULLFSBLOCK ||
5269 XFS_FSB_TO_AGNO(mp, *firstblock) ==
5270 XFS_FSB_TO_AGNO(mp,
5271 cur->bc_private.b.firstblock) ||
5272 (flist->xbf_low &&
5273 XFS_FSB_TO_AGNO(mp, *firstblock) <
5274 XFS_FSB_TO_AGNO(mp,
5275 cur->bc_private.b.firstblock)));
5276 *firstblock = cur->bc_private.b.firstblock;
5277 }
5278 xfs_btree_del_cursor(cur,
5279 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5280 }
5281 if (!error)
5282 xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
5283 orig_nmap, *nmap);
5284 return error;
5285 }
5286
5287 /*
5288 * Map file blocks to filesystem blocks, simple version.
5289 * One block (extent) only, read-only.
5290 * For flags, only the XFS_BMAPI_ATTRFORK flag is examined.
5291 * For the other flag values, the effect is as if XFS_BMAPI_METADATA
5292 * was set and all the others were clear.
5293 */
5294 int /* error */
5295 xfs_bmapi_single(
5296 xfs_trans_t *tp, /* transaction pointer */
5297 xfs_inode_t *ip, /* incore inode */
5298 int whichfork, /* data or attr fork */
5299 xfs_fsblock_t *fsb, /* output: mapped block */
5300 xfs_fileoff_t bno) /* starting file offs. mapped */
5301 {
5302 int eof; /* we've hit the end of extents */
5303 int error; /* error return */
5304 xfs_bmbt_irec_t got; /* current file extent record */
5305 xfs_ifork_t *ifp; /* inode fork pointer */
5306 xfs_extnum_t lastx; /* last useful extent number */
5307 xfs_bmbt_irec_t prev; /* previous file extent record */
5308
5309 ifp = XFS_IFORK_PTR(ip, whichfork);
5310 if (unlikely(
5311 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
5312 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)) {
5313 XFS_ERROR_REPORT("xfs_bmapi_single", XFS_ERRLEVEL_LOW,
5314 ip->i_mount);
5315 return XFS_ERROR(EFSCORRUPTED);
5316 }
5317 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
5318 return XFS_ERROR(EIO);
5319 XFS_STATS_INC(xs_blk_mapr);
5320 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5321 (error = xfs_iread_extents(tp, ip, whichfork)))
5322 return error;
5323 (void)xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
5324 &prev);
5325 /*
5326 * Reading past eof, act as though there's a hole
5327 * up to end.
5328 */
5329 if (eof || got.br_startoff > bno) {
5330 *fsb = NULLFSBLOCK;
5331 return 0;
5332 }
5333 ASSERT(!ISNULLSTARTBLOCK(got.br_startblock));
5334 ASSERT(bno < got.br_startoff + got.br_blockcount);
5335 *fsb = got.br_startblock + (bno - got.br_startoff);
5336 ifp->if_lastex = lastx;
5337 return 0;
5338 }
5339
5340 /*
5341 * Unmap (remove) blocks from a file.
5342 * If nexts is nonzero then the number of extents to remove is limited to
5343 * that value. If not all extents in the block range can be removed then
5344 * *done is set.
5345 */
5346 int /* error */
5347 xfs_bunmapi(
5348 xfs_trans_t *tp, /* transaction pointer */
5349 struct xfs_inode *ip, /* incore inode */
5350 xfs_fileoff_t bno, /* starting offset to unmap */
5351 xfs_filblks_t len, /* length to unmap in file */
5352 int flags, /* misc flags */
5353 xfs_extnum_t nexts, /* number of extents max */
5354 xfs_fsblock_t *firstblock, /* first allocated block
5355 controls a.g. for allocs */
5356 xfs_bmap_free_t *flist, /* i/o: list extents to free */
5357 xfs_extdelta_t *delta, /* o: change made to incore
5358 extents */
5359 int *done) /* set if not done yet */
5360 {
5361 xfs_btree_cur_t *cur; /* bmap btree cursor */
5362 xfs_bmbt_irec_t del; /* extent being deleted */
5363 int eof; /* is deleting at eof */
5364 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
5365 int error; /* error return value */
5366 xfs_extnum_t extno; /* extent number in list */
5367 xfs_bmbt_irec_t got; /* current extent record */
5368 xfs_ifork_t *ifp; /* inode fork pointer */
5369 int isrt; /* freeing in rt area */
5370 xfs_extnum_t lastx; /* last extent index used */
5371 int logflags; /* transaction logging flags */
5372 xfs_extlen_t mod; /* rt extent offset */
5373 xfs_mount_t *mp; /* mount structure */
5374 xfs_extnum_t nextents; /* number of file extents */
5375 xfs_bmbt_irec_t prev; /* previous extent record */
5376 xfs_fileoff_t start; /* first file offset deleted */
5377 int tmp_logflags; /* partial logging flags */
5378 int wasdel; /* was a delayed alloc extent */
5379 int whichfork; /* data or attribute fork */
5380 int rsvd; /* OK to allocate reserved blocks */
5381 xfs_fsblock_t sum;
5382
5383 xfs_bunmap_trace(ip, bno, len, flags, (inst_t *)__return_address);
5384 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
5385 XFS_ATTR_FORK : XFS_DATA_FORK;
5386 ifp = XFS_IFORK_PTR(ip, whichfork);
5387 if (unlikely(
5388 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
5389 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
5390 XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW,
5391 ip->i_mount);
5392 return XFS_ERROR(EFSCORRUPTED);
5393 }
5394 mp = ip->i_mount;
5395 if (XFS_FORCED_SHUTDOWN(mp))
5396 return XFS_ERROR(EIO);
5397 rsvd = (flags & XFS_BMAPI_RSVBLOCKS) != 0;
5398 ASSERT(len > 0);
5399 ASSERT(nexts >= 0);
5400 ASSERT(ifp->if_ext_max ==
5401 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5402 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5403 (error = xfs_iread_extents(tp, ip, whichfork)))
5404 return error;
5405 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5406 if (nextents == 0) {
5407 *done = 1;
5408 return 0;
5409 }
5410 XFS_STATS_INC(xs_blk_unmap);
5411 isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
5412 start = bno;
5413 bno = start + len - 1;
5414 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
5415 &prev);
5416 if (delta) {
5417 delta->xed_startoff = NULLFILEOFF;
5418 delta->xed_blockcount = 0;
5419 }
5420 /*
5421 * Check to see if the given block number is past the end of the
5422 * file, back up to the last block if so...
5423 */
5424 if (eof) {
5425 ep = xfs_iext_get_ext(ifp, --lastx);
5426 xfs_bmbt_get_all(ep, &got);
5427 bno = got.br_startoff + got.br_blockcount - 1;
5428 }
5429 logflags = 0;
5430 if (ifp->if_flags & XFS_IFBROOT) {
5431 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
5432 cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
5433 whichfork);
5434 cur->bc_private.b.firstblock = *firstblock;
5435 cur->bc_private.b.flist = flist;
5436 cur->bc_private.b.flags = 0;
5437 } else
5438 cur = NULL;
5439 extno = 0;
5440 while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
5441 (nexts == 0 || extno < nexts)) {
5442 /*
5443 * Is the found extent after a hole in which bno lives?
5444 * Just back up to the previous extent, if so.
5445 */
5446 if (got.br_startoff > bno) {
5447 if (--lastx < 0)
5448 break;
5449 ep = xfs_iext_get_ext(ifp, lastx);
5450 xfs_bmbt_get_all(ep, &got);
5451 }
5452 /*
5453 * Is the last block of this extent before the range
5454 * we're supposed to delete? If so, we're done.
5455 */
5456 bno = XFS_FILEOFF_MIN(bno,
5457 got.br_startoff + got.br_blockcount - 1);
5458 if (bno < start)
5459 break;
5460 /*
5461 * Then deal with the (possibly delayed) allocated space
5462 * we found.
5463 */
5464 ASSERT(ep != NULL);
5465 del = got;
5466 wasdel = ISNULLSTARTBLOCK(del.br_startblock);
5467 if (got.br_startoff < start) {
5468 del.br_startoff = start;
5469 del.br_blockcount -= start - got.br_startoff;
5470 if (!wasdel)
5471 del.br_startblock += start - got.br_startoff;
5472 }
5473 if (del.br_startoff + del.br_blockcount > bno + 1)
5474 del.br_blockcount = bno + 1 - del.br_startoff;
5475 sum = del.br_startblock + del.br_blockcount;
5476 if (isrt &&
5477 (mod = do_mod(sum, mp->m_sb.sb_rextsize))) {
5478 /*
5479 * Realtime extent not lined up at the end.
5480 * The extent could have been split into written
5481 * and unwritten pieces, or we could just be
5482 * unmapping part of it. But we can't really
5483 * get rid of part of a realtime extent.
5484 */
5485 if (del.br_state == XFS_EXT_UNWRITTEN ||
5486 !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5487 /*
5488 * This piece is unwritten, or we're not
5489 * using unwritten extents. Skip over it.
5490 */
5491 ASSERT(bno >= mod);
5492 bno -= mod > del.br_blockcount ?
5493 del.br_blockcount : mod;
5494 if (bno < got.br_startoff) {
5495 if (--lastx >= 0)
5496 xfs_bmbt_get_all(xfs_iext_get_ext(
5497 ifp, lastx), &got);
5498 }
5499 continue;
5500 }
5501 /*
5502 * It's written, turn it unwritten.
5503 * This is better than zeroing it.
5504 */
5505 ASSERT(del.br_state == XFS_EXT_NORM);
5506 ASSERT(xfs_trans_get_block_res(tp) > 0);
5507 /*
5508 * If this spans a realtime extent boundary,
5509 * chop it back to the start of the one we end at.
5510 */
5511 if (del.br_blockcount > mod) {
5512 del.br_startoff += del.br_blockcount - mod;
5513 del.br_startblock += del.br_blockcount - mod;
5514 del.br_blockcount = mod;
5515 }
5516 del.br_state = XFS_EXT_UNWRITTEN;
5517 error = xfs_bmap_add_extent(ip, lastx, &cur, &del,
5518 firstblock, flist, &logflags, delta,
5519 XFS_DATA_FORK, 0);
5520 if (error)
5521 goto error0;
5522 goto nodelete;
5523 }
5524 if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) {
5525 /*
5526 * Realtime extent is lined up at the end but not
5527 * at the front. We'll get rid of full extents if
5528 * we can.
5529 */
5530 mod = mp->m_sb.sb_rextsize - mod;
5531 if (del.br_blockcount > mod) {
5532 del.br_blockcount -= mod;
5533 del.br_startoff += mod;
5534 del.br_startblock += mod;
5535 } else if ((del.br_startoff == start &&
5536 (del.br_state == XFS_EXT_UNWRITTEN ||
5537 xfs_trans_get_block_res(tp) == 0)) ||
5538 !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5539 /*
5540 * Can't make it unwritten. There isn't
5541 * a full extent here so just skip it.
5542 */
5543 ASSERT(bno >= del.br_blockcount);
5544 bno -= del.br_blockcount;
5545 if (bno < got.br_startoff) {
5546 if (--lastx >= 0)
5547 xfs_bmbt_get_all(--ep, &got);
5548 }
5549 continue;
5550 } else if (del.br_state == XFS_EXT_UNWRITTEN) {
5551 /*
5552 * This one is already unwritten.
5553 * It must have a written left neighbor.
5554 * Unwrite the killed part of that one and
5555 * try again.
5556 */
5557 ASSERT(lastx > 0);
5558 xfs_bmbt_get_all(xfs_iext_get_ext(ifp,
5559 lastx - 1), &prev);
5560 ASSERT(prev.br_state == XFS_EXT_NORM);
5561 ASSERT(!ISNULLSTARTBLOCK(prev.br_startblock));
5562 ASSERT(del.br_startblock ==
5563 prev.br_startblock + prev.br_blockcount);
5564 if (prev.br_startoff < start) {
5565 mod = start - prev.br_startoff;
5566 prev.br_blockcount -= mod;
5567 prev.br_startblock += mod;
5568 prev.br_startoff = start;
5569 }
5570 prev.br_state = XFS_EXT_UNWRITTEN;
5571 error = xfs_bmap_add_extent(ip, lastx - 1, &cur,
5572 &prev, firstblock, flist, &logflags,
5573 delta, XFS_DATA_FORK, 0);
5574 if (error)
5575 goto error0;
5576 goto nodelete;
5577 } else {
5578 ASSERT(del.br_state == XFS_EXT_NORM);
5579 del.br_state = XFS_EXT_UNWRITTEN;
5580 error = xfs_bmap_add_extent(ip, lastx, &cur,
5581 &del, firstblock, flist, &logflags,
5582 delta, XFS_DATA_FORK, 0);
5583 if (error)
5584 goto error0;
5585 goto nodelete;
5586 }
5587 }
5588 if (wasdel) {
5589 ASSERT(STARTBLOCKVAL(del.br_startblock) > 0);
5590 /* Update realtime/data freespace, unreserve quota */
5591 if (isrt) {
5592 xfs_filblks_t rtexts;
5593
5594 rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
5595 do_div(rtexts, mp->m_sb.sb_rextsize);
5596 xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
5597 (int64_t)rtexts, rsvd);
5598 (void)XFS_TRANS_RESERVE_QUOTA_NBLKS(mp,
5599 NULL, ip, -((long)del.br_blockcount), 0,
5600 XFS_QMOPT_RES_RTBLKS);
5601 } else {
5602 xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS,
5603 (int64_t)del.br_blockcount, rsvd);
5604 (void)XFS_TRANS_RESERVE_QUOTA_NBLKS(mp,
5605 NULL, ip, -((long)del.br_blockcount), 0,
5606 XFS_QMOPT_RES_REGBLKS);
5607 }
5608 ip->i_delayed_blks -= del.br_blockcount;
5609 if (cur)
5610 cur->bc_private.b.flags |=
5611 XFS_BTCUR_BPRV_WASDEL;
5612 } else if (cur)
5613 cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
5614 /*
5615 * If it's the case where the directory code is running
5616 * with no block reservation, and the deleted block is in
5617 * the middle of its extent, and the resulting insert
5618 * of an extent would cause transformation to btree format,
5619 * then reject it. The calling code will then swap
5620 * blocks around instead.
5621 * We have to do this now, rather than waiting for the
5622 * conversion to btree format, since the transaction
5623 * will be dirty.
5624 */
5625 if (!wasdel && xfs_trans_get_block_res(tp) == 0 &&
5626 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5627 XFS_IFORK_NEXTENTS(ip, whichfork) >= ifp->if_ext_max &&
5628 del.br_startoff > got.br_startoff &&
5629 del.br_startoff + del.br_blockcount <
5630 got.br_startoff + got.br_blockcount) {
5631 error = XFS_ERROR(ENOSPC);
5632 goto error0;
5633 }
5634 error = xfs_bmap_del_extent(ip, tp, lastx, flist, cur, &del,
5635 &tmp_logflags, delta, whichfork, rsvd);
5636 logflags |= tmp_logflags;
5637 if (error)
5638 goto error0;
5639 bno = del.br_startoff - 1;
5640 nodelete:
5641 lastx = ifp->if_lastex;
5642 /*
5643 * If not done go on to the next (previous) record.
5644 * Reset ep in case the extents array was re-alloced.
5645 */
5646 ep = xfs_iext_get_ext(ifp, lastx);
5647 if (bno != (xfs_fileoff_t)-1 && bno >= start) {
5648 if (lastx >= XFS_IFORK_NEXTENTS(ip, whichfork) ||
5649 xfs_bmbt_get_startoff(ep) > bno) {
5650 if (--lastx >= 0)
5651 ep = xfs_iext_get_ext(ifp, lastx);
5652 }
5653 if (lastx >= 0)
5654 xfs_bmbt_get_all(ep, &got);
5655 extno++;
5656 }
5657 }
5658 ifp->if_lastex = lastx;
5659 *done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0;
5660 ASSERT(ifp->if_ext_max ==
5661 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5662 /*
5663 * Convert to a btree if necessary.
5664 */
5665 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5666 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
5667 ASSERT(cur == NULL);
5668 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist,
5669 &cur, 0, &tmp_logflags, whichfork);
5670 logflags |= tmp_logflags;
5671 if (error)
5672 goto error0;
5673 }
5674 /*
5675 * transform from btree to extents, give it cur
5676 */
5677 else if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
5678 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
5679 ASSERT(cur != NULL);
5680 error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
5681 whichfork);
5682 logflags |= tmp_logflags;
5683 if (error)
5684 goto error0;
5685 }
5686 /*
5687 * transform from extents to local?
5688 */
5689 ASSERT(ifp->if_ext_max ==
5690 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5691 error = 0;
5692 if (delta && delta->xed_startoff != NULLFILEOFF) {
5693 /* A change was actually made.
5694 * Note that delta->xed_blockount is an offset at this
5695 * point and needs to be converted to a block count.
5696 */
5697 ASSERT(delta->xed_blockcount > delta->xed_startoff);
5698 delta->xed_blockcount -= delta->xed_startoff;
5699 }
5700 error0:
5701 /*
5702 * Log everything. Do this after conversion, there's no point in
5703 * logging the extent records if we've converted to btree format.
5704 */
5705 if ((logflags & XFS_ILOG_FEXT(whichfork)) &&
5706 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5707 logflags &= ~XFS_ILOG_FEXT(whichfork);
5708 else if ((logflags & XFS_ILOG_FBROOT(whichfork)) &&
5709 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5710 logflags &= ~XFS_ILOG_FBROOT(whichfork);
5711 /*
5712 * Log inode even in the error case, if the transaction
5713 * is dirty we'll need to shut down the filesystem.
5714 */
5715 if (logflags)
5716 xfs_trans_log_inode(tp, ip, logflags);
5717 if (cur) {
5718 if (!error) {
5719 *firstblock = cur->bc_private.b.firstblock;
5720 cur->bc_private.b.allocated = 0;
5721 }
5722 xfs_btree_del_cursor(cur,
5723 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5724 }
5725 return error;
5726 }
5727
5728 /*
5729 * returns 1 for success, 0 if we failed to map the extent.
5730 */
5731 STATIC int
5732 xfs_getbmapx_fix_eof_hole(
5733 xfs_inode_t *ip, /* xfs incore inode pointer */
5734 struct getbmap *out, /* output structure */
5735 int prealloced, /* this is a file with
5736 * preallocated data space */
5737 __int64_t end, /* last block requested */
5738 xfs_fsblock_t startblock)
5739 {
5740 __int64_t fixlen;
5741 xfs_mount_t *mp; /* file system mount point */
5742
5743 if (startblock == HOLESTARTBLOCK) {
5744 mp = ip->i_mount;
5745 out->bmv_block = -1;
5746 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, ip->i_size));
5747 fixlen -= out->bmv_offset;
5748 if (prealloced && out->bmv_offset + out->bmv_length == end) {
5749 /* Came to hole at EOF. Trim it. */
5750 if (fixlen <= 0)
5751 return 0;
5752 out->bmv_length = fixlen;
5753 }
5754 } else {
5755 out->bmv_block = XFS_FSB_TO_DB(ip, startblock);
5756 }
5757
5758 return 1;
5759 }
5760
5761 /*
5762 * Fcntl interface to xfs_bmapi.
5763 */
5764 int /* error code */
5765 xfs_getbmap(
5766 xfs_inode_t *ip,
5767 struct getbmap *bmv, /* user bmap structure */
5768 void __user *ap, /* pointer to user's array */
5769 int interface) /* interface flags */
5770 {
5771 __int64_t bmvend; /* last block requested */
5772 int error; /* return value */
5773 __int64_t fixlen; /* length for -1 case */
5774 int i; /* extent number */
5775 bhv_vnode_t *vp; /* corresponding vnode */
5776 int lock; /* lock state */
5777 xfs_bmbt_irec_t *map; /* buffer for user's data */
5778 xfs_mount_t *mp; /* file system mount point */
5779 int nex; /* # of user extents can do */
5780 int nexleft; /* # of user extents left */
5781 int subnex; /* # of bmapi's can do */
5782 int nmap; /* number of map entries */
5783 struct getbmap out; /* output structure */
5784 int whichfork; /* data or attr fork */
5785 int prealloced; /* this is a file with
5786 * preallocated data space */
5787 int sh_unwritten; /* true, if unwritten */
5788 /* extents listed separately */
5789 int bmapi_flags; /* flags for xfs_bmapi */
5790 __int32_t oflags; /* getbmapx bmv_oflags field */
5791
5792 vp = XFS_ITOV(ip);
5793 mp = ip->i_mount;
5794
5795 whichfork = interface & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
5796 sh_unwritten = (interface & BMV_IF_PREALLOC) != 0;
5797
5798 /* If the BMV_IF_NO_DMAPI_READ interface bit specified, do not
5799 * generate a DMAPI read event. Otherwise, if the DM_EVENT_READ
5800 * bit is set for the file, generate a read event in order
5801 * that the DMAPI application may do its thing before we return
5802 * the extents. Usually this means restoring user file data to
5803 * regions of the file that look like holes.
5804 *
5805 * The "old behavior" (from XFS_IOC_GETBMAP) is to not specify
5806 * BMV_IF_NO_DMAPI_READ so that read events are generated.
5807 * If this were not true, callers of ioctl( XFS_IOC_GETBMAP )
5808 * could misinterpret holes in a DMAPI file as true holes,
5809 * when in fact they may represent offline user data.
5810 */
5811 if ((interface & BMV_IF_NO_DMAPI_READ) == 0 &&
5812 DM_EVENT_ENABLED(ip, DM_EVENT_READ) &&
5813 whichfork == XFS_DATA_FORK) {
5814 error = XFS_SEND_DATA(mp, DM_EVENT_READ, vp, 0, 0, 0, NULL);
5815 if (error)
5816 return XFS_ERROR(error);
5817 }
5818
5819 if (whichfork == XFS_ATTR_FORK) {
5820 if (XFS_IFORK_Q(ip)) {
5821 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS &&
5822 ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE &&
5823 ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)
5824 return XFS_ERROR(EINVAL);
5825 } else if (unlikely(
5826 ip->i_d.di_aformat != 0 &&
5827 ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) {
5828 XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW,
5829 ip->i_mount);
5830 return XFS_ERROR(EFSCORRUPTED);
5831 }
5832 } else if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
5833 ip->i_d.di_format != XFS_DINODE_FMT_BTREE &&
5834 ip->i_d.di_format != XFS_DINODE_FMT_LOCAL)
5835 return XFS_ERROR(EINVAL);
5836 if (whichfork == XFS_DATA_FORK) {
5837 if (xfs_get_extsz_hint(ip) ||
5838 ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){
5839 prealloced = 1;
5840 fixlen = XFS_MAXIOFFSET(mp);
5841 } else {
5842 prealloced = 0;
5843 fixlen = ip->i_size;
5844 }
5845 } else {
5846 prealloced = 0;
5847 fixlen = 1LL << 32;
5848 }
5849
5850 if (bmv->bmv_length == -1) {
5851 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen));
5852 bmv->bmv_length = MAX( (__int64_t)(fixlen - bmv->bmv_offset),
5853 (__int64_t)0);
5854 } else if (bmv->bmv_length < 0)
5855 return XFS_ERROR(EINVAL);
5856 if (bmv->bmv_length == 0) {
5857 bmv->bmv_entries = 0;
5858 return 0;
5859 }
5860 nex = bmv->bmv_count - 1;
5861 if (nex <= 0)
5862 return XFS_ERROR(EINVAL);
5863 bmvend = bmv->bmv_offset + bmv->bmv_length;
5864
5865 xfs_ilock(ip, XFS_IOLOCK_SHARED);
5866
5867 if (whichfork == XFS_DATA_FORK &&
5868 (ip->i_delayed_blks || ip->i_size > ip->i_d.di_size)) {
5869 /* xfs_fsize_t last_byte = xfs_file_last_byte(ip); */
5870 error = xfs_flush_pages(ip, (xfs_off_t)0,
5871 -1, 0, FI_REMAPF);
5872 }
5873
5874 ASSERT(whichfork == XFS_ATTR_FORK || ip->i_delayed_blks == 0);
5875
5876 lock = xfs_ilock_map_shared(ip);
5877
5878 /*
5879 * Don't let nex be bigger than the number of extents
5880 * we can have assuming alternating holes and real extents.
5881 */
5882 if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1)
5883 nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1;
5884
5885 bmapi_flags = XFS_BMAPI_AFLAG(whichfork) |
5886 ((sh_unwritten) ? 0 : XFS_BMAPI_IGSTATE);
5887
5888 /*
5889 * Allocate enough space to handle "subnex" maps at a time.
5890 */
5891 subnex = 16;
5892 map = kmem_alloc(subnex * sizeof(*map), KM_SLEEP);
5893
5894 bmv->bmv_entries = 0;
5895
5896 if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0) {
5897 error = 0;
5898 goto unlock_and_return;
5899 }
5900
5901 nexleft = nex;
5902
5903 do {
5904 nmap = (nexleft > subnex) ? subnex : nexleft;
5905 error = xfs_bmapi(NULL, ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
5906 XFS_BB_TO_FSB(mp, bmv->bmv_length),
5907 bmapi_flags, NULL, 0, map, &nmap,
5908 NULL, NULL);
5909 if (error)
5910 goto unlock_and_return;
5911 ASSERT(nmap <= subnex);
5912
5913 for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
5914 nexleft--;
5915 oflags = (map[i].br_state == XFS_EXT_UNWRITTEN) ?
5916 BMV_OF_PREALLOC : 0;
5917 out.bmv_offset = XFS_FSB_TO_BB(mp, map[i].br_startoff);
5918 out.bmv_length = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
5919 ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
5920 if (map[i].br_startblock == HOLESTARTBLOCK &&
5921 whichfork == XFS_ATTR_FORK) {
5922 /* came to the end of attribute fork */
5923 goto unlock_and_return;
5924 } else {
5925 if (!xfs_getbmapx_fix_eof_hole(ip, &out,
5926 prealloced, bmvend,
5927 map[i].br_startblock)) {
5928 goto unlock_and_return;
5929 }
5930
5931 /* return either getbmap/getbmapx structure. */
5932 if (interface & BMV_IF_EXTENDED) {
5933 struct getbmapx outx;
5934
5935 GETBMAP_CONVERT(out,outx);
5936 outx.bmv_oflags = oflags;
5937 outx.bmv_unused1 = outx.bmv_unused2 = 0;
5938 if (copy_to_user(ap, &outx,
5939 sizeof(outx))) {
5940 error = XFS_ERROR(EFAULT);
5941 goto unlock_and_return;
5942 }
5943 } else {
5944 if (copy_to_user(ap, &out,
5945 sizeof(out))) {
5946 error = XFS_ERROR(EFAULT);
5947 goto unlock_and_return;
5948 }
5949 }
5950 bmv->bmv_offset =
5951 out.bmv_offset + out.bmv_length;
5952 bmv->bmv_length = MAX((__int64_t)0,
5953 (__int64_t)(bmvend - bmv->bmv_offset));
5954 bmv->bmv_entries++;
5955 ap = (interface & BMV_IF_EXTENDED) ?
5956 (void __user *)
5957 ((struct getbmapx __user *)ap + 1) :
5958 (void __user *)
5959 ((struct getbmap __user *)ap + 1);
5960 }
5961 }
5962 } while (nmap && nexleft && bmv->bmv_length);
5963
5964 unlock_and_return:
5965 xfs_iunlock_map_shared(ip, lock);
5966 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
5967
5968 kmem_free(map, subnex * sizeof(*map));
5969
5970 return error;
5971 }
5972
5973 /*
5974 * Check the last inode extent to determine whether this allocation will result
5975 * in blocks being allocated at the end of the file. When we allocate new data
5976 * blocks at the end of the file which do not start at the previous data block,
5977 * we will try to align the new blocks at stripe unit boundaries.
5978 */
5979 STATIC int /* error */
5980 xfs_bmap_isaeof(
5981 xfs_inode_t *ip, /* incore inode pointer */
5982 xfs_fileoff_t off, /* file offset in fsblocks */
5983 int whichfork, /* data or attribute fork */
5984 char *aeof) /* return value */
5985 {
5986 int error; /* error return value */
5987 xfs_ifork_t *ifp; /* inode fork pointer */
5988 xfs_bmbt_rec_host_t *lastrec; /* extent record pointer */
5989 xfs_extnum_t nextents; /* number of file extents */
5990 xfs_bmbt_irec_t s; /* expanded extent record */
5991
5992 ASSERT(whichfork == XFS_DATA_FORK);
5993 ifp = XFS_IFORK_PTR(ip, whichfork);
5994 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5995 (error = xfs_iread_extents(NULL, ip, whichfork)))
5996 return error;
5997 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5998 if (nextents == 0) {
5999 *aeof = 1;
6000 return 0;
6001 }
6002 /*
6003 * Go to the last extent
6004 */
6005 lastrec = xfs_iext_get_ext(ifp, nextents - 1);
6006 xfs_bmbt_get_all(lastrec, &s);
6007 /*
6008 * Check we are allocating in the last extent (for delayed allocations)
6009 * or past the last extent for non-delayed allocations.
6010 */
6011 *aeof = (off >= s.br_startoff &&
6012 off < s.br_startoff + s.br_blockcount &&
6013 ISNULLSTARTBLOCK(s.br_startblock)) ||
6014 off >= s.br_startoff + s.br_blockcount;
6015 return 0;
6016 }
6017
6018 /*
6019 * Check if the endoff is outside the last extent. If so the caller will grow
6020 * the allocation to a stripe unit boundary.
6021 */
6022 int /* error */
6023 xfs_bmap_eof(
6024 xfs_inode_t *ip, /* incore inode pointer */
6025 xfs_fileoff_t endoff, /* file offset in fsblocks */
6026 int whichfork, /* data or attribute fork */
6027 int *eof) /* result value */
6028 {
6029 xfs_fsblock_t blockcount; /* extent block count */
6030 int error; /* error return value */
6031 xfs_ifork_t *ifp; /* inode fork pointer */
6032 xfs_bmbt_rec_host_t *lastrec; /* extent record pointer */
6033 xfs_extnum_t nextents; /* number of file extents */
6034 xfs_fileoff_t startoff; /* extent starting file offset */
6035
6036 ASSERT(whichfork == XFS_DATA_FORK);
6037 ifp = XFS_IFORK_PTR(ip, whichfork);
6038 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
6039 (error = xfs_iread_extents(NULL, ip, whichfork)))
6040 return error;
6041 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
6042 if (nextents == 0) {
6043 *eof = 1;
6044 return 0;
6045 }
6046 /*
6047 * Go to the last extent
6048 */
6049 lastrec = xfs_iext_get_ext(ifp, nextents - 1);
6050 startoff = xfs_bmbt_get_startoff(lastrec);
6051 blockcount = xfs_bmbt_get_blockcount(lastrec);
6052 *eof = endoff >= startoff + blockcount;
6053 return 0;
6054 }
6055
6056 #ifdef DEBUG
6057 STATIC
6058 xfs_buf_t *
6059 xfs_bmap_get_bp(
6060 xfs_btree_cur_t *cur,
6061 xfs_fsblock_t bno)
6062 {
6063 int i;
6064 xfs_buf_t *bp;
6065
6066 if (!cur)
6067 return(NULL);
6068
6069 bp = NULL;
6070 for(i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
6071 bp = cur->bc_bufs[i];
6072 if (!bp) break;
6073 if (XFS_BUF_ADDR(bp) == bno)
6074 break; /* Found it */
6075 }
6076 if (i == XFS_BTREE_MAXLEVELS)
6077 bp = NULL;
6078
6079 if (!bp) { /* Chase down all the log items to see if the bp is there */
6080 xfs_log_item_chunk_t *licp;
6081 xfs_trans_t *tp;
6082
6083 tp = cur->bc_tp;
6084 licp = &tp->t_items;
6085 while (!bp && licp != NULL) {
6086 if (XFS_LIC_ARE_ALL_FREE(licp)) {
6087 licp = licp->lic_next;
6088 continue;
6089 }
6090 for (i = 0; i < licp->lic_unused; i++) {
6091 xfs_log_item_desc_t *lidp;
6092 xfs_log_item_t *lip;
6093 xfs_buf_log_item_t *bip;
6094 xfs_buf_t *lbp;
6095
6096 if (XFS_LIC_ISFREE(licp, i)) {
6097 continue;
6098 }
6099
6100 lidp = XFS_LIC_SLOT(licp, i);
6101 lip = lidp->lid_item;
6102 if (lip->li_type != XFS_LI_BUF)
6103 continue;
6104
6105 bip = (xfs_buf_log_item_t *)lip;
6106 lbp = bip->bli_buf;
6107
6108 if (XFS_BUF_ADDR(lbp) == bno) {
6109 bp = lbp;
6110 break; /* Found it */
6111 }
6112 }
6113 licp = licp->lic_next;
6114 }
6115 }
6116 return(bp);
6117 }
6118
6119 void
6120 xfs_check_block(
6121 xfs_bmbt_block_t *block,
6122 xfs_mount_t *mp,
6123 int root,
6124 short sz)
6125 {
6126 int i, j, dmxr;
6127 __be64 *pp, *thispa; /* pointer to block address */
6128 xfs_bmbt_key_t *prevp, *keyp;
6129
6130 ASSERT(be16_to_cpu(block->bb_level) > 0);
6131
6132 prevp = NULL;
6133 for( i = 1; i <= be16_to_cpu(block->bb_numrecs); i++) {
6134 dmxr = mp->m_bmap_dmxr[0];
6135
6136 if (root) {
6137 keyp = XFS_BMAP_BROOT_KEY_ADDR(block, i, sz);
6138 } else {
6139 keyp = XFS_BTREE_KEY_ADDR(xfs_bmbt, block, i);
6140 }
6141
6142 if (prevp) {
6143 xfs_btree_check_key(XFS_BTNUM_BMAP, prevp, keyp);
6144 }
6145 prevp = keyp;
6146
6147 /*
6148 * Compare the block numbers to see if there are dups.
6149 */
6150
6151 if (root) {
6152 pp = XFS_BMAP_BROOT_PTR_ADDR(block, i, sz);
6153 } else {
6154 pp = XFS_BTREE_PTR_ADDR(xfs_bmbt, block, i, dmxr);
6155 }
6156 for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
6157 if (root) {
6158 thispa = XFS_BMAP_BROOT_PTR_ADDR(block, j, sz);
6159 } else {
6160 thispa = XFS_BTREE_PTR_ADDR(xfs_bmbt, block, j,
6161 dmxr);
6162 }
6163 if (*thispa == *pp) {
6164 cmn_err(CE_WARN, "%s: thispa(%d) == pp(%d) %Ld",
6165 __FUNCTION__, j, i,
6166 (unsigned long long)be64_to_cpu(*thispa));
6167 panic("%s: ptrs are equal in node\n",
6168 __FUNCTION__);
6169 }
6170 }
6171 }
6172 }
6173
6174 /*
6175 * Check that the extents for the inode ip are in the right order in all
6176 * btree leaves.
6177 */
6178
6179 STATIC void
6180 xfs_bmap_check_leaf_extents(
6181 xfs_btree_cur_t *cur, /* btree cursor or null */
6182 xfs_inode_t *ip, /* incore inode pointer */
6183 int whichfork) /* data or attr fork */
6184 {
6185 xfs_bmbt_block_t *block; /* current btree block */
6186 xfs_fsblock_t bno; /* block # of "block" */
6187 xfs_buf_t *bp; /* buffer for "block" */
6188 int error; /* error return value */
6189 xfs_extnum_t i=0, j; /* index into the extents list */
6190 xfs_ifork_t *ifp; /* fork structure */
6191 int level; /* btree level, for checking */
6192 xfs_mount_t *mp; /* file system mount structure */
6193 __be64 *pp; /* pointer to block address */
6194 xfs_bmbt_rec_t *ep; /* pointer to current extent */
6195 xfs_bmbt_rec_t *lastp; /* pointer to previous extent */
6196 xfs_bmbt_rec_t *nextp; /* pointer to next extent */
6197 int bp_release = 0;
6198
6199 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
6200 return;
6201 }
6202
6203 bno = NULLFSBLOCK;
6204 mp = ip->i_mount;
6205 ifp = XFS_IFORK_PTR(ip, whichfork);
6206 block = ifp->if_broot;
6207 /*
6208 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
6209 */
6210 level = be16_to_cpu(block->bb_level);
6211 ASSERT(level > 0);
6212 xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
6213 pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
6214 bno = be64_to_cpu(*pp);
6215
6216 ASSERT(bno != NULLDFSBNO);
6217 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
6218 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
6219
6220 /*
6221 * Go down the tree until leaf level is reached, following the first
6222 * pointer (leftmost) at each level.
6223 */
6224 while (level-- > 0) {
6225 /* See if buf is in cur first */
6226 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
6227 if (bp) {
6228 bp_release = 0;
6229 } else {
6230 bp_release = 1;
6231 }
6232 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
6233 XFS_BMAP_BTREE_REF)))
6234 goto error_norelse;
6235 block = XFS_BUF_TO_BMBT_BLOCK(bp);
6236 XFS_WANT_CORRUPTED_GOTO(
6237 XFS_BMAP_SANITY_CHECK(mp, block, level),
6238 error0);
6239 if (level == 0)
6240 break;
6241
6242 /*
6243 * Check this block for basic sanity (increasing keys and
6244 * no duplicate blocks).
6245 */
6246
6247 xfs_check_block(block, mp, 0, 0);
6248 pp = XFS_BTREE_PTR_ADDR(xfs_bmbt, block, 1, mp->m_bmap_dmxr[1]);
6249 bno = be64_to_cpu(*pp);
6250 XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
6251 if (bp_release) {
6252 bp_release = 0;
6253 xfs_trans_brelse(NULL, bp);
6254 }
6255 }
6256
6257 /*
6258 * Here with bp and block set to the leftmost leaf node in the tree.
6259 */
6260 i = 0;
6261
6262 /*
6263 * Loop over all leaf nodes checking that all extents are in the right order.
6264 */
6265 lastp = NULL;
6266 for (;;) {
6267 xfs_fsblock_t nextbno;
6268 xfs_extnum_t num_recs;
6269
6270
6271 num_recs = be16_to_cpu(block->bb_numrecs);
6272
6273 /*
6274 * Read-ahead the next leaf block, if any.
6275 */
6276
6277 nextbno = be64_to_cpu(block->bb_rightsib);
6278
6279 /*
6280 * Check all the extents to make sure they are OK.
6281 * If we had a previous block, the last entry should
6282 * conform with the first entry in this one.
6283 */
6284
6285 ep = XFS_BTREE_REC_ADDR(xfs_bmbt, block, 1);
6286 for (j = 1; j < num_recs; j++) {
6287 nextp = XFS_BTREE_REC_ADDR(xfs_bmbt, block, j + 1);
6288 if (lastp) {
6289 xfs_btree_check_rec(XFS_BTNUM_BMAP,
6290 (void *)lastp, (void *)ep);
6291 }
6292 xfs_btree_check_rec(XFS_BTNUM_BMAP, (void *)ep,
6293 (void *)(nextp));
6294 lastp = ep;
6295 ep = nextp;
6296 }
6297
6298 i += num_recs;
6299 if (bp_release) {
6300 bp_release = 0;
6301 xfs_trans_brelse(NULL, bp);
6302 }
6303 bno = nextbno;
6304 /*
6305 * If we've reached the end, stop.
6306 */
6307 if (bno == NULLFSBLOCK)
6308 break;
6309
6310 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
6311 if (bp) {
6312 bp_release = 0;
6313 } else {
6314 bp_release = 1;
6315 }
6316 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
6317 XFS_BMAP_BTREE_REF)))
6318 goto error_norelse;
6319 block = XFS_BUF_TO_BMBT_BLOCK(bp);
6320 }
6321 if (bp_release) {
6322 bp_release = 0;
6323 xfs_trans_brelse(NULL, bp);
6324 }
6325 return;
6326
6327 error0:
6328 cmn_err(CE_WARN, "%s: at error0", __FUNCTION__);
6329 if (bp_release)
6330 xfs_trans_brelse(NULL, bp);
6331 error_norelse:
6332 cmn_err(CE_WARN, "%s: BAD after btree leaves for %d extents",
6333 __FUNCTION__, i);
6334 panic("%s: CORRUPTED BTREE OR SOMETHING", __FUNCTION__);
6335 return;
6336 }
6337 #endif
6338
6339 /*
6340 * Count fsblocks of the given fork.
6341 */
6342 int /* error */
6343 xfs_bmap_count_blocks(
6344 xfs_trans_t *tp, /* transaction pointer */
6345 xfs_inode_t *ip, /* incore inode */
6346 int whichfork, /* data or attr fork */
6347 int *count) /* out: count of blocks */
6348 {
6349 xfs_bmbt_block_t *block; /* current btree block */
6350 xfs_fsblock_t bno; /* block # of "block" */
6351 xfs_ifork_t *ifp; /* fork structure */
6352 int level; /* btree level, for checking */
6353 xfs_mount_t *mp; /* file system mount structure */
6354 __be64 *pp; /* pointer to block address */
6355
6356 bno = NULLFSBLOCK;
6357 mp = ip->i_mount;
6358 ifp = XFS_IFORK_PTR(ip, whichfork);
6359 if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) {
6360 if (unlikely(xfs_bmap_count_leaves(ifp, 0,
6361 ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t),
6362 count) < 0)) {
6363 XFS_ERROR_REPORT("xfs_bmap_count_blocks(1)",
6364 XFS_ERRLEVEL_LOW, mp);
6365 return XFS_ERROR(EFSCORRUPTED);
6366 }
6367 return 0;
6368 }
6369
6370 /*
6371 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
6372 */
6373 block = ifp->if_broot;
6374 level = be16_to_cpu(block->bb_level);
6375 ASSERT(level > 0);
6376 pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
6377 bno = be64_to_cpu(*pp);
6378 ASSERT(bno != NULLDFSBNO);
6379 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
6380 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
6381
6382 if (unlikely(xfs_bmap_count_tree(mp, tp, ifp, bno, level, count) < 0)) {
6383 XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW,
6384 mp);
6385 return XFS_ERROR(EFSCORRUPTED);
6386 }
6387
6388 return 0;
6389 }
6390
6391 /*
6392 * Recursively walks each level of a btree
6393 * to count total fsblocks is use.
6394 */
6395 STATIC int /* error */
6396 xfs_bmap_count_tree(
6397 xfs_mount_t *mp, /* file system mount point */
6398 xfs_trans_t *tp, /* transaction pointer */
6399 xfs_ifork_t *ifp, /* inode fork pointer */
6400 xfs_fsblock_t blockno, /* file system block number */
6401 int levelin, /* level in btree */
6402 int *count) /* Count of blocks */
6403 {
6404 int error;
6405 xfs_buf_t *bp, *nbp;
6406 int level = levelin;
6407 __be64 *pp;
6408 xfs_fsblock_t bno = blockno;
6409 xfs_fsblock_t nextbno;
6410 xfs_bmbt_block_t *block, *nextblock;
6411 int numrecs;
6412
6413 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF)))
6414 return error;
6415 *count += 1;
6416 block = XFS_BUF_TO_BMBT_BLOCK(bp);
6417
6418 if (--level) {
6419 /* Not at node above leafs, count this level of nodes */
6420 nextbno = be64_to_cpu(block->bb_rightsib);
6421 while (nextbno != NULLFSBLOCK) {
6422 if ((error = xfs_btree_read_bufl(mp, tp, nextbno,
6423 0, &nbp, XFS_BMAP_BTREE_REF)))
6424 return error;
6425 *count += 1;
6426 nextblock = XFS_BUF_TO_BMBT_BLOCK(nbp);
6427 nextbno = be64_to_cpu(nextblock->bb_rightsib);
6428 xfs_trans_brelse(tp, nbp);
6429 }
6430
6431 /* Dive to the next level */
6432 pp = XFS_BTREE_PTR_ADDR(xfs_bmbt, block, 1, mp->m_bmap_dmxr[1]);
6433 bno = be64_to_cpu(*pp);
6434 if (unlikely((error =
6435 xfs_bmap_count_tree(mp, tp, ifp, bno, level, count)) < 0)) {
6436 xfs_trans_brelse(tp, bp);
6437 XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
6438 XFS_ERRLEVEL_LOW, mp);
6439 return XFS_ERROR(EFSCORRUPTED);
6440 }
6441 xfs_trans_brelse(tp, bp);
6442 } else {
6443 /* count all level 1 nodes and their leaves */
6444 for (;;) {
6445 nextbno = be64_to_cpu(block->bb_rightsib);
6446 numrecs = be16_to_cpu(block->bb_numrecs);
6447 if (unlikely(xfs_bmap_disk_count_leaves(0,
6448 block, numrecs, count) < 0)) {
6449 xfs_trans_brelse(tp, bp);
6450 XFS_ERROR_REPORT("xfs_bmap_count_tree(2)",
6451 XFS_ERRLEVEL_LOW, mp);
6452 return XFS_ERROR(EFSCORRUPTED);
6453 }
6454 xfs_trans_brelse(tp, bp);
6455 if (nextbno == NULLFSBLOCK)
6456 break;
6457 bno = nextbno;
6458 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
6459 XFS_BMAP_BTREE_REF)))
6460 return error;
6461 *count += 1;
6462 block = XFS_BUF_TO_BMBT_BLOCK(bp);
6463 }
6464 }
6465 return 0;
6466 }
6467
6468 /*
6469 * Count leaf blocks given a range of extent records.
6470 */
6471 STATIC int
6472 xfs_bmap_count_leaves(
6473 xfs_ifork_t *ifp,
6474 xfs_extnum_t idx,
6475 int numrecs,
6476 int *count)
6477 {
6478 int b;
6479
6480 for (b = 0; b < numrecs; b++) {
6481 xfs_bmbt_rec_host_t *frp = xfs_iext_get_ext(ifp, idx + b);
6482 *count += xfs_bmbt_get_blockcount(frp);
6483 }
6484 return 0;
6485 }
6486
6487 /*
6488 * Count leaf blocks given a range of extent records originally
6489 * in btree format.
6490 */
6491 STATIC int
6492 xfs_bmap_disk_count_leaves(
6493 xfs_extnum_t idx,
6494 xfs_bmbt_block_t *block,
6495 int numrecs,
6496 int *count)
6497 {
6498 int b;
6499 xfs_bmbt_rec_t *frp;
6500
6501 for (b = 1; b <= numrecs; b++) {
6502 frp = XFS_BTREE_REC_ADDR(xfs_bmbt, block, idx + b);
6503 *count += xfs_bmbt_disk_get_blockcount(frp);
6504 }
6505 return 0;
6506 }
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