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Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6
[linux-2.6/linux-2.6-openrd.git] / fs / xfs / xfs_bmap.c
blob98251cdc52aa92e2c1557ce71dfd0d9382935887
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 #include "xfs_trace.h"
58
59
60 #ifdef DEBUG
61 STATIC void
62 xfs_bmap_check_leaf_extents(xfs_btree_cur_t *cur, xfs_inode_t *ip, int whichfork);
63 #endif
64
65 kmem_zone_t *xfs_bmap_free_item_zone;
66
67 /*
68 * Prototypes for internal bmap routines.
69 */
70
71
72 /*
73 * Called from xfs_bmap_add_attrfork to handle extents format files.
74 */
75 STATIC int /* error */
76 xfs_bmap_add_attrfork_extents(
77 xfs_trans_t *tp, /* transaction pointer */
78 xfs_inode_t *ip, /* incore inode pointer */
79 xfs_fsblock_t *firstblock, /* first block allocated */
80 xfs_bmap_free_t *flist, /* blocks to free at commit */
81 int *flags); /* inode logging flags */
82
83 /*
84 * Called from xfs_bmap_add_attrfork to handle local format files.
85 */
86 STATIC int /* error */
87 xfs_bmap_add_attrfork_local(
88 xfs_trans_t *tp, /* transaction pointer */
89 xfs_inode_t *ip, /* incore inode pointer */
90 xfs_fsblock_t *firstblock, /* first block allocated */
91 xfs_bmap_free_t *flist, /* blocks to free at commit */
92 int *flags); /* inode logging flags */
93
94 /*
95 * Called by xfs_bmapi to update file extent records and the btree
96 * after allocating space (or doing a delayed allocation).
97 */
98 STATIC int /* error */
99 xfs_bmap_add_extent(
100 xfs_inode_t *ip, /* incore inode pointer */
101 xfs_extnum_t idx, /* extent number to update/insert */
102 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
103 xfs_bmbt_irec_t *new, /* new data to add to file extents */
104 xfs_fsblock_t *first, /* pointer to firstblock variable */
105 xfs_bmap_free_t *flist, /* list of extents to be freed */
106 int *logflagsp, /* inode logging flags */
107 xfs_extdelta_t *delta, /* Change made to incore extents */
108 int whichfork, /* data or attr fork */
109 int rsvd); /* OK to allocate reserved blocks */
110
111 /*
112 * Called by xfs_bmap_add_extent to handle cases converting a delayed
113 * allocation to a real allocation.
114 */
115 STATIC int /* error */
116 xfs_bmap_add_extent_delay_real(
117 xfs_inode_t *ip, /* incore inode pointer */
118 xfs_extnum_t idx, /* extent number to update/insert */
119 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
120 xfs_bmbt_irec_t *new, /* new data to add to file extents */
121 xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
122 xfs_fsblock_t *first, /* pointer to firstblock variable */
123 xfs_bmap_free_t *flist, /* list of extents to be freed */
124 int *logflagsp, /* inode logging flags */
125 xfs_extdelta_t *delta, /* Change made to incore extents */
126 int rsvd); /* OK to allocate reserved blocks */
127
128 /*
129 * Called by xfs_bmap_add_extent to handle cases converting a hole
130 * to a delayed allocation.
131 */
132 STATIC int /* error */
133 xfs_bmap_add_extent_hole_delay(
134 xfs_inode_t *ip, /* incore inode pointer */
135 xfs_extnum_t idx, /* extent number to update/insert */
136 xfs_bmbt_irec_t *new, /* new data to add to file extents */
137 int *logflagsp,/* inode logging flags */
138 xfs_extdelta_t *delta, /* Change made to incore extents */
139 int rsvd); /* OK to allocate reserved blocks */
140
141 /*
142 * Called by xfs_bmap_add_extent to handle cases converting a hole
143 * to a real allocation.
144 */
145 STATIC int /* error */
146 xfs_bmap_add_extent_hole_real(
147 xfs_inode_t *ip, /* incore inode pointer */
148 xfs_extnum_t idx, /* extent number to update/insert */
149 xfs_btree_cur_t *cur, /* if null, not a btree */
150 xfs_bmbt_irec_t *new, /* new data to add to file extents */
151 int *logflagsp, /* inode logging flags */
152 xfs_extdelta_t *delta, /* Change made to incore extents */
153 int whichfork); /* data or attr fork */
154
155 /*
156 * Called by xfs_bmap_add_extent to handle cases converting an unwritten
157 * allocation to a real allocation or vice versa.
158 */
159 STATIC int /* error */
160 xfs_bmap_add_extent_unwritten_real(
161 xfs_inode_t *ip, /* incore inode pointer */
162 xfs_extnum_t idx, /* extent number to update/insert */
163 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
164 xfs_bmbt_irec_t *new, /* new data to add to file extents */
165 int *logflagsp, /* inode logging flags */
166 xfs_extdelta_t *delta); /* Change made to incore extents */
167
168 /*
169 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
170 * It figures out where to ask the underlying allocator to put the new extent.
171 */
172 STATIC int /* error */
173 xfs_bmap_alloc(
174 xfs_bmalloca_t *ap); /* bmap alloc argument struct */
175
176 /*
177 * Transform a btree format file with only one leaf node, where the
178 * extents list will fit in the inode, into an extents format file.
179 * Since the file extents are already in-core, all we have to do is
180 * give up the space for the btree root and pitch the leaf block.
181 */
182 STATIC int /* error */
183 xfs_bmap_btree_to_extents(
184 xfs_trans_t *tp, /* transaction pointer */
185 xfs_inode_t *ip, /* incore inode pointer */
186 xfs_btree_cur_t *cur, /* btree cursor */
187 int *logflagsp, /* inode logging flags */
188 int whichfork); /* data or attr fork */
189
190 /*
191 * Called by xfs_bmapi to update file extent records and the btree
192 * after removing space (or undoing a delayed allocation).
193 */
194 STATIC int /* error */
195 xfs_bmap_del_extent(
196 xfs_inode_t *ip, /* incore inode pointer */
197 xfs_trans_t *tp, /* current trans pointer */
198 xfs_extnum_t idx, /* extent number to update/insert */
199 xfs_bmap_free_t *flist, /* list of extents to be freed */
200 xfs_btree_cur_t *cur, /* if null, not a btree */
201 xfs_bmbt_irec_t *new, /* new data to add to file extents */
202 int *logflagsp,/* inode logging flags */
203 xfs_extdelta_t *delta, /* Change made to incore extents */
204 int whichfork, /* data or attr fork */
205 int rsvd); /* OK to allocate reserved blocks */
206
207 /*
208 * Remove the entry "free" from the free item list. Prev points to the
209 * previous entry, unless "free" is the head of the list.
210 */
211 STATIC void
212 xfs_bmap_del_free(
213 xfs_bmap_free_t *flist, /* free item list header */
214 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
215 xfs_bmap_free_item_t *free); /* list item to be freed */
216
217 /*
218 * Convert an extents-format file into a btree-format file.
219 * The new file will have a root block (in the inode) and a single child block.
220 */
221 STATIC int /* error */
222 xfs_bmap_extents_to_btree(
223 xfs_trans_t *tp, /* transaction pointer */
224 xfs_inode_t *ip, /* incore inode pointer */
225 xfs_fsblock_t *firstblock, /* first-block-allocated */
226 xfs_bmap_free_t *flist, /* blocks freed in xaction */
227 xfs_btree_cur_t **curp, /* cursor returned to caller */
228 int wasdel, /* converting a delayed alloc */
229 int *logflagsp, /* inode logging flags */
230 int whichfork); /* data or attr fork */
231
232 /*
233 * Convert a local file to an extents file.
234 * This code is sort of bogus, since the file data needs to get
235 * logged so it won't be lost. The bmap-level manipulations are ok, though.
236 */
237 STATIC int /* error */
238 xfs_bmap_local_to_extents(
239 xfs_trans_t *tp, /* transaction pointer */
240 xfs_inode_t *ip, /* incore inode pointer */
241 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
242 xfs_extlen_t total, /* total blocks needed by transaction */
243 int *logflagsp, /* inode logging flags */
244 int whichfork); /* data or attr fork */
245
246 /*
247 * Search the extents list for the inode, for the extent containing bno.
248 * If bno lies in a hole, point to the next entry. If bno lies past eof,
249 * *eofp will be set, and *prevp will contain the last entry (null if none).
250 * Else, *lastxp will be set to the index of the found
251 * entry; *gotp will contain the entry.
252 */
253 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
254 xfs_bmap_search_extents(
255 xfs_inode_t *ip, /* incore inode pointer */
256 xfs_fileoff_t bno, /* block number searched for */
257 int whichfork, /* data or attr fork */
258 int *eofp, /* out: end of file found */
259 xfs_extnum_t *lastxp, /* out: last extent index */
260 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
261 xfs_bmbt_irec_t *prevp); /* out: previous extent entry found */
262
263 /*
264 * Check the last inode extent to determine whether this allocation will result
265 * in blocks being allocated at the end of the file. When we allocate new data
266 * blocks at the end of the file which do not start at the previous data block,
267 * we will try to align the new blocks at stripe unit boundaries.
268 */
269 STATIC int /* error */
270 xfs_bmap_isaeof(
271 xfs_inode_t *ip, /* incore inode pointer */
272 xfs_fileoff_t off, /* file offset in fsblocks */
273 int whichfork, /* data or attribute fork */
274 char *aeof); /* return value */
275
276 /*
277 * Compute the worst-case number of indirect blocks that will be used
278 * for ip's delayed extent of length "len".
279 */
280 STATIC xfs_filblks_t
281 xfs_bmap_worst_indlen(
282 xfs_inode_t *ip, /* incore inode pointer */
283 xfs_filblks_t len); /* delayed extent length */
284
285 #ifdef DEBUG
286 /*
287 * Perform various validation checks on the values being returned
288 * from xfs_bmapi().
289 */
290 STATIC void
291 xfs_bmap_validate_ret(
292 xfs_fileoff_t bno,
293 xfs_filblks_t len,
294 int flags,
295 xfs_bmbt_irec_t *mval,
296 int nmap,
297 int ret_nmap);
298 #else
299 #define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
300 #endif /* DEBUG */
301
302 STATIC int
303 xfs_bmap_count_tree(
304 xfs_mount_t *mp,
305 xfs_trans_t *tp,
306 xfs_ifork_t *ifp,
307 xfs_fsblock_t blockno,
308 int levelin,
309 int *count);
310
311 STATIC void
312 xfs_bmap_count_leaves(
313 xfs_ifork_t *ifp,
314 xfs_extnum_t idx,
315 int numrecs,
316 int *count);
317
318 STATIC void
319 xfs_bmap_disk_count_leaves(
320 struct xfs_mount *mp,
321 struct xfs_btree_block *block,
322 int numrecs,
323 int *count);
324
325 /*
326 * Bmap internal routines.
327 */
328
329 STATIC int /* error */
330 xfs_bmbt_lookup_eq(
331 struct xfs_btree_cur *cur,
332 xfs_fileoff_t off,
333 xfs_fsblock_t bno,
334 xfs_filblks_t len,
335 int *stat) /* success/failure */
336 {
337 cur->bc_rec.b.br_startoff = off;
338 cur->bc_rec.b.br_startblock = bno;
339 cur->bc_rec.b.br_blockcount = len;
340 return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
341 }
342
343 STATIC int /* error */
344 xfs_bmbt_lookup_ge(
345 struct xfs_btree_cur *cur,
346 xfs_fileoff_t off,
347 xfs_fsblock_t bno,
348 xfs_filblks_t len,
349 int *stat) /* success/failure */
350 {
351 cur->bc_rec.b.br_startoff = off;
352 cur->bc_rec.b.br_startblock = bno;
353 cur->bc_rec.b.br_blockcount = len;
354 return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
355 }
356
357 /*
358 * Update the record referred to by cur to the value given
359 * by [off, bno, len, state].
360 * This either works (return 0) or gets an EFSCORRUPTED error.
361 */
362 STATIC int
363 xfs_bmbt_update(
364 struct xfs_btree_cur *cur,
365 xfs_fileoff_t off,
366 xfs_fsblock_t bno,
367 xfs_filblks_t len,
368 xfs_exntst_t state)
369 {
370 union xfs_btree_rec rec;
371
372 xfs_bmbt_disk_set_allf(&rec.bmbt, off, bno, len, state);
373 return xfs_btree_update(cur, &rec);
374 }
375
376 /*
377 * Called from xfs_bmap_add_attrfork to handle btree format files.
378 */
379 STATIC int /* error */
380 xfs_bmap_add_attrfork_btree(
381 xfs_trans_t *tp, /* transaction pointer */
382 xfs_inode_t *ip, /* incore inode pointer */
383 xfs_fsblock_t *firstblock, /* first block allocated */
384 xfs_bmap_free_t *flist, /* blocks to free at commit */
385 int *flags) /* inode logging flags */
386 {
387 xfs_btree_cur_t *cur; /* btree cursor */
388 int error; /* error return value */
389 xfs_mount_t *mp; /* file system mount struct */
390 int stat; /* newroot status */
391
392 mp = ip->i_mount;
393 if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
394 *flags |= XFS_ILOG_DBROOT;
395 else {
396 cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
397 cur->bc_private.b.flist = flist;
398 cur->bc_private.b.firstblock = *firstblock;
399 if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
400 goto error0;
401 /* must be at least one entry */
402 XFS_WANT_CORRUPTED_GOTO(stat == 1, error0);
403 if ((error = xfs_btree_new_iroot(cur, flags, &stat)))
404 goto error0;
405 if (stat == 0) {
406 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
407 return XFS_ERROR(ENOSPC);
408 }
409 *firstblock = cur->bc_private.b.firstblock;
410 cur->bc_private.b.allocated = 0;
411 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
412 }
413 return 0;
414 error0:
415 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
416 return error;
417 }
418
419 /*
420 * Called from xfs_bmap_add_attrfork to handle extents format files.
421 */
422 STATIC int /* error */
423 xfs_bmap_add_attrfork_extents(
424 xfs_trans_t *tp, /* transaction pointer */
425 xfs_inode_t *ip, /* incore inode pointer */
426 xfs_fsblock_t *firstblock, /* first block allocated */
427 xfs_bmap_free_t *flist, /* blocks to free at commit */
428 int *flags) /* inode logging flags */
429 {
430 xfs_btree_cur_t *cur; /* bmap btree cursor */
431 int error; /* error return value */
432
433 if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
434 return 0;
435 cur = NULL;
436 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist, &cur, 0,
437 flags, XFS_DATA_FORK);
438 if (cur) {
439 cur->bc_private.b.allocated = 0;
440 xfs_btree_del_cursor(cur,
441 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
442 }
443 return error;
444 }
445
446 /*
447 * Called from xfs_bmap_add_attrfork to handle local format files.
448 */
449 STATIC int /* error */
450 xfs_bmap_add_attrfork_local(
451 xfs_trans_t *tp, /* transaction pointer */
452 xfs_inode_t *ip, /* incore inode pointer */
453 xfs_fsblock_t *firstblock, /* first block allocated */
454 xfs_bmap_free_t *flist, /* blocks to free at commit */
455 int *flags) /* inode logging flags */
456 {
457 xfs_da_args_t dargs; /* args for dir/attr code */
458 int error; /* error return value */
459 xfs_mount_t *mp; /* mount structure pointer */
460
461 if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
462 return 0;
463 if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
464 mp = ip->i_mount;
465 memset(&dargs, 0, sizeof(dargs));
466 dargs.dp = ip;
467 dargs.firstblock = firstblock;
468 dargs.flist = flist;
469 dargs.total = mp->m_dirblkfsbs;
470 dargs.whichfork = XFS_DATA_FORK;
471 dargs.trans = tp;
472 error = xfs_dir2_sf_to_block(&dargs);
473 } else
474 error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
475 XFS_DATA_FORK);
476 return error;
477 }
478
479 /*
480 * Called by xfs_bmapi to update file extent records and the btree
481 * after allocating space (or doing a delayed allocation).
482 */
483 STATIC int /* error */
484 xfs_bmap_add_extent(
485 xfs_inode_t *ip, /* incore inode pointer */
486 xfs_extnum_t idx, /* extent number to update/insert */
487 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
488 xfs_bmbt_irec_t *new, /* new data to add to file extents */
489 xfs_fsblock_t *first, /* pointer to firstblock variable */
490 xfs_bmap_free_t *flist, /* list of extents to be freed */
491 int *logflagsp, /* inode logging flags */
492 xfs_extdelta_t *delta, /* Change made to incore extents */
493 int whichfork, /* data or attr fork */
494 int rsvd) /* OK to use reserved data blocks */
495 {
496 xfs_btree_cur_t *cur; /* btree cursor or null */
497 xfs_filblks_t da_new; /* new count del alloc blocks used */
498 xfs_filblks_t da_old; /* old count del alloc blocks used */
499 int error; /* error return value */
500 xfs_ifork_t *ifp; /* inode fork ptr */
501 int logflags; /* returned value */
502 xfs_extnum_t nextents; /* number of extents in file now */
503
504 XFS_STATS_INC(xs_add_exlist);
505 cur = *curp;
506 ifp = XFS_IFORK_PTR(ip, whichfork);
507 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
508 ASSERT(idx <= nextents);
509 da_old = da_new = 0;
510 error = 0;
511 /*
512 * This is the first extent added to a new/empty file.
513 * Special case this one, so other routines get to assume there are
514 * already extents in the list.
515 */
516 if (nextents == 0) {
517 xfs_iext_insert(ip, 0, 1, new,
518 whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0);
519
520 ASSERT(cur == NULL);
521 ifp->if_lastex = 0;
522 if (!isnullstartblock(new->br_startblock)) {
523 XFS_IFORK_NEXT_SET(ip, whichfork, 1);
524 logflags = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
525 } else
526 logflags = 0;
527 /* DELTA: single new extent */
528 if (delta) {
529 if (delta->xed_startoff > new->br_startoff)
530 delta->xed_startoff = new->br_startoff;
531 if (delta->xed_blockcount <
532 new->br_startoff + new->br_blockcount)
533 delta->xed_blockcount = new->br_startoff +
534 new->br_blockcount;
535 }
536 }
537 /*
538 * Any kind of new delayed allocation goes here.
539 */
540 else if (isnullstartblock(new->br_startblock)) {
541 if (cur)
542 ASSERT((cur->bc_private.b.flags &
543 XFS_BTCUR_BPRV_WASDEL) == 0);
544 if ((error = xfs_bmap_add_extent_hole_delay(ip, idx, new,
545 &logflags, delta, rsvd)))
546 goto done;
547 }
548 /*
549 * Real allocation off the end of the file.
550 */
551 else if (idx == nextents) {
552 if (cur)
553 ASSERT((cur->bc_private.b.flags &
554 XFS_BTCUR_BPRV_WASDEL) == 0);
555 if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur, new,
556 &logflags, delta, whichfork)))
557 goto done;
558 } else {
559 xfs_bmbt_irec_t prev; /* old extent at offset idx */
560
561 /*
562 * Get the record referred to by idx.
563 */
564 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx), &prev);
565 /*
566 * If it's a real allocation record, and the new allocation ends
567 * after the start of the referred to record, then we're filling
568 * in a delayed or unwritten allocation with a real one, or
569 * converting real back to unwritten.
570 */
571 if (!isnullstartblock(new->br_startblock) &&
572 new->br_startoff + new->br_blockcount > prev.br_startoff) {
573 if (prev.br_state != XFS_EXT_UNWRITTEN &&
574 isnullstartblock(prev.br_startblock)) {
575 da_old = startblockval(prev.br_startblock);
576 if (cur)
577 ASSERT(cur->bc_private.b.flags &
578 XFS_BTCUR_BPRV_WASDEL);
579 if ((error = xfs_bmap_add_extent_delay_real(ip,
580 idx, &cur, new, &da_new, first, flist,
581 &logflags, delta, rsvd)))
582 goto done;
583 } else if (new->br_state == XFS_EXT_NORM) {
584 ASSERT(new->br_state == XFS_EXT_NORM);
585 if ((error = xfs_bmap_add_extent_unwritten_real(
586 ip, idx, &cur, new, &logflags, delta)))
587 goto done;
588 } else {
589 ASSERT(new->br_state == XFS_EXT_UNWRITTEN);
590 if ((error = xfs_bmap_add_extent_unwritten_real(
591 ip, idx, &cur, new, &logflags, delta)))
592 goto done;
593 }
594 ASSERT(*curp == cur || *curp == NULL);
595 }
596 /*
597 * Otherwise we're filling in a hole with an allocation.
598 */
599 else {
600 if (cur)
601 ASSERT((cur->bc_private.b.flags &
602 XFS_BTCUR_BPRV_WASDEL) == 0);
603 if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur,
604 new, &logflags, delta, whichfork)))
605 goto done;
606 }
607 }
608
609 ASSERT(*curp == cur || *curp == NULL);
610 /*
611 * Convert to a btree if necessary.
612 */
613 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
614 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
615 int tmp_logflags; /* partial log flag return val */
616
617 ASSERT(cur == NULL);
618 error = xfs_bmap_extents_to_btree(ip->i_transp, ip, first,
619 flist, &cur, da_old > 0, &tmp_logflags, whichfork);
620 logflags |= tmp_logflags;
621 if (error)
622 goto done;
623 }
624 /*
625 * Adjust for changes in reserved delayed indirect blocks.
626 * Nothing to do for disk quotas here.
627 */
628 if (da_old || da_new) {
629 xfs_filblks_t nblks;
630
631 nblks = da_new;
632 if (cur)
633 nblks += cur->bc_private.b.allocated;
634 ASSERT(nblks <= da_old);
635 if (nblks < da_old)
636 xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
637 (int64_t)(da_old - nblks), rsvd);
638 }
639 /*
640 * Clear out the allocated field, done with it now in any case.
641 */
642 if (cur) {
643 cur->bc_private.b.allocated = 0;
644 *curp = cur;
645 }
646 done:
647 #ifdef DEBUG
648 if (!error)
649 xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
650 #endif
651 *logflagsp = logflags;
652 return error;
653 }
654
655 /*
656 * Called by xfs_bmap_add_extent to handle cases converting a delayed
657 * allocation to a real allocation.
658 */
659 STATIC int /* error */
660 xfs_bmap_add_extent_delay_real(
661 xfs_inode_t *ip, /* incore inode pointer */
662 xfs_extnum_t idx, /* extent number to update/insert */
663 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
664 xfs_bmbt_irec_t *new, /* new data to add to file extents */
665 xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
666 xfs_fsblock_t *first, /* pointer to firstblock variable */
667 xfs_bmap_free_t *flist, /* list of extents to be freed */
668 int *logflagsp, /* inode logging flags */
669 xfs_extdelta_t *delta, /* Change made to incore extents */
670 int rsvd) /* OK to use reserved data block allocation */
671 {
672 xfs_btree_cur_t *cur; /* btree cursor */
673 int diff; /* temp value */
674 xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
675 int error; /* error return value */
676 int i; /* temp state */
677 xfs_ifork_t *ifp; /* inode fork pointer */
678 xfs_fileoff_t new_endoff; /* end offset of new entry */
679 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
680 /* left is 0, right is 1, prev is 2 */
681 int rval=0; /* return value (logging flags) */
682 int state = 0;/* state bits, accessed thru macros */
683 xfs_filblks_t temp=0; /* value for dnew calculations */
684 xfs_filblks_t temp2=0;/* value for dnew calculations */
685 int tmp_rval; /* partial logging flags */
686
687 #define LEFT r[0]
688 #define RIGHT r[1]
689 #define PREV r[2]
690
691 /*
692 * Set up a bunch of variables to make the tests simpler.
693 */
694 cur = *curp;
695 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
696 ep = xfs_iext_get_ext(ifp, idx);
697 xfs_bmbt_get_all(ep, &PREV);
698 new_endoff = new->br_startoff + new->br_blockcount;
699 ASSERT(PREV.br_startoff <= new->br_startoff);
700 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
701
702 /*
703 * Set flags determining what part of the previous delayed allocation
704 * extent is being replaced by a real allocation.
705 */
706 if (PREV.br_startoff == new->br_startoff)
707 state |= BMAP_LEFT_FILLING;
708 if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
709 state |= BMAP_RIGHT_FILLING;
710
711 /*
712 * Check and set flags if this segment has a left neighbor.
713 * Don't set contiguous if the combined extent would be too large.
714 */
715 if (idx > 0) {
716 state |= BMAP_LEFT_VALID;
717 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &LEFT);
718
719 if (isnullstartblock(LEFT.br_startblock))
720 state |= BMAP_LEFT_DELAY;
721 }
722
723 if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
724 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
725 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
726 LEFT.br_state == new->br_state &&
727 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
728 state |= BMAP_LEFT_CONTIG;
729
730 /*
731 * Check and set flags if this segment has a right neighbor.
732 * Don't set contiguous if the combined extent would be too large.
733 * Also check for all-three-contiguous being too large.
734 */
735 if (idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
736 state |= BMAP_RIGHT_VALID;
737 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx + 1), &RIGHT);
738
739 if (isnullstartblock(RIGHT.br_startblock))
740 state |= BMAP_RIGHT_DELAY;
741 }
742
743 if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
744 new_endoff == RIGHT.br_startoff &&
745 new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
746 new->br_state == RIGHT.br_state &&
747 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
748 ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
749 BMAP_RIGHT_FILLING)) !=
750 (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
751 BMAP_RIGHT_FILLING) ||
752 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
753 <= MAXEXTLEN))
754 state |= BMAP_RIGHT_CONTIG;
755
756 error = 0;
757 /*
758 * Switch out based on the FILLING and CONTIG state bits.
759 */
760 switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
761 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
762 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
763 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
764 /*
765 * Filling in all of a previously delayed allocation extent.
766 * The left and right neighbors are both contiguous with new.
767 */
768 trace_xfs_bmap_pre_update(ip, idx - 1, state, _THIS_IP_);
769 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
770 LEFT.br_blockcount + PREV.br_blockcount +
771 RIGHT.br_blockcount);
772 trace_xfs_bmap_post_update(ip, idx - 1, state, _THIS_IP_);
773
774 xfs_iext_remove(ip, idx, 2, state);
775 ip->i_df.if_lastex = idx - 1;
776 ip->i_d.di_nextents--;
777 if (cur == NULL)
778 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
779 else {
780 rval = XFS_ILOG_CORE;
781 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
782 RIGHT.br_startblock,
783 RIGHT.br_blockcount, &i)))
784 goto done;
785 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
786 if ((error = xfs_btree_delete(cur, &i)))
787 goto done;
788 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
789 if ((error = xfs_btree_decrement(cur, 0, &i)))
790 goto done;
791 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
792 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
793 LEFT.br_startblock,
794 LEFT.br_blockcount +
795 PREV.br_blockcount +
796 RIGHT.br_blockcount, LEFT.br_state)))
797 goto done;
798 }
799 *dnew = 0;
800 /* DELTA: Three in-core extents are replaced by one. */
801 temp = LEFT.br_startoff;
802 temp2 = LEFT.br_blockcount +
803 PREV.br_blockcount +
804 RIGHT.br_blockcount;
805 break;
806
807 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
808 /*
809 * Filling in all of a previously delayed allocation extent.
810 * The left neighbor is contiguous, the right is not.
811 */
812 trace_xfs_bmap_pre_update(ip, idx - 1, state, _THIS_IP_);
813 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
814 LEFT.br_blockcount + PREV.br_blockcount);
815 trace_xfs_bmap_post_update(ip, idx - 1, state, _THIS_IP_);
816
817 ip->i_df.if_lastex = idx - 1;
818 xfs_iext_remove(ip, idx, 1, state);
819 if (cur == NULL)
820 rval = XFS_ILOG_DEXT;
821 else {
822 rval = 0;
823 if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
824 LEFT.br_startblock, LEFT.br_blockcount,
825 &i)))
826 goto done;
827 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
828 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
829 LEFT.br_startblock,
830 LEFT.br_blockcount +
831 PREV.br_blockcount, LEFT.br_state)))
832 goto done;
833 }
834 *dnew = 0;
835 /* DELTA: Two in-core extents are replaced by one. */
836 temp = LEFT.br_startoff;
837 temp2 = LEFT.br_blockcount +
838 PREV.br_blockcount;
839 break;
840
841 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
842 /*
843 * Filling in all of a previously delayed allocation extent.
844 * The right neighbor is contiguous, the left is not.
845 */
846 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
847 xfs_bmbt_set_startblock(ep, new->br_startblock);
848 xfs_bmbt_set_blockcount(ep,
849 PREV.br_blockcount + RIGHT.br_blockcount);
850 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
851
852 ip->i_df.if_lastex = idx;
853 xfs_iext_remove(ip, idx + 1, 1, state);
854 if (cur == NULL)
855 rval = XFS_ILOG_DEXT;
856 else {
857 rval = 0;
858 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
859 RIGHT.br_startblock,
860 RIGHT.br_blockcount, &i)))
861 goto done;
862 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
863 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
864 new->br_startblock,
865 PREV.br_blockcount +
866 RIGHT.br_blockcount, PREV.br_state)))
867 goto done;
868 }
869 *dnew = 0;
870 /* DELTA: Two in-core extents are replaced by one. */
871 temp = PREV.br_startoff;
872 temp2 = PREV.br_blockcount +
873 RIGHT.br_blockcount;
874 break;
875
876 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
877 /*
878 * Filling in all of a previously delayed allocation extent.
879 * Neither the left nor right neighbors are contiguous with
880 * the new one.
881 */
882 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
883 xfs_bmbt_set_startblock(ep, new->br_startblock);
884 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
885
886 ip->i_df.if_lastex = idx;
887 ip->i_d.di_nextents++;
888 if (cur == NULL)
889 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
890 else {
891 rval = XFS_ILOG_CORE;
892 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
893 new->br_startblock, new->br_blockcount,
894 &i)))
895 goto done;
896 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
897 cur->bc_rec.b.br_state = XFS_EXT_NORM;
898 if ((error = xfs_btree_insert(cur, &i)))
899 goto done;
900 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
901 }
902 *dnew = 0;
903 /* DELTA: The in-core extent described by new changed type. */
904 temp = new->br_startoff;
905 temp2 = new->br_blockcount;
906 break;
907
908 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
909 /*
910 * Filling in the first part of a previous delayed allocation.
911 * The left neighbor is contiguous.
912 */
913 trace_xfs_bmap_pre_update(ip, idx - 1, state, _THIS_IP_);
914 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
915 LEFT.br_blockcount + new->br_blockcount);
916 xfs_bmbt_set_startoff(ep,
917 PREV.br_startoff + new->br_blockcount);
918 trace_xfs_bmap_post_update(ip, idx - 1, state, _THIS_IP_);
919
920 temp = PREV.br_blockcount - new->br_blockcount;
921 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
922 xfs_bmbt_set_blockcount(ep, temp);
923 ip->i_df.if_lastex = idx - 1;
924 if (cur == NULL)
925 rval = XFS_ILOG_DEXT;
926 else {
927 rval = 0;
928 if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
929 LEFT.br_startblock, LEFT.br_blockcount,
930 &i)))
931 goto done;
932 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
933 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
934 LEFT.br_startblock,
935 LEFT.br_blockcount +
936 new->br_blockcount,
937 LEFT.br_state)))
938 goto done;
939 }
940 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
941 startblockval(PREV.br_startblock));
942 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
943 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
944 *dnew = temp;
945 /* DELTA: The boundary between two in-core extents moved. */
946 temp = LEFT.br_startoff;
947 temp2 = LEFT.br_blockcount +
948 PREV.br_blockcount;
949 break;
950
951 case BMAP_LEFT_FILLING:
952 /*
953 * Filling in the first part of a previous delayed allocation.
954 * The left neighbor is not contiguous.
955 */
956 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
957 xfs_bmbt_set_startoff(ep, new_endoff);
958 temp = PREV.br_blockcount - new->br_blockcount;
959 xfs_bmbt_set_blockcount(ep, temp);
960 xfs_iext_insert(ip, idx, 1, new, state);
961 ip->i_df.if_lastex = idx;
962 ip->i_d.di_nextents++;
963 if (cur == NULL)
964 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
965 else {
966 rval = XFS_ILOG_CORE;
967 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
968 new->br_startblock, new->br_blockcount,
969 &i)))
970 goto done;
971 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
972 cur->bc_rec.b.br_state = XFS_EXT_NORM;
973 if ((error = xfs_btree_insert(cur, &i)))
974 goto done;
975 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
976 }
977 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
978 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
979 error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
980 first, flist, &cur, 1, &tmp_rval,
981 XFS_DATA_FORK);
982 rval |= tmp_rval;
983 if (error)
984 goto done;
985 }
986 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
987 startblockval(PREV.br_startblock) -
988 (cur ? cur->bc_private.b.allocated : 0));
989 ep = xfs_iext_get_ext(ifp, idx + 1);
990 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
991 trace_xfs_bmap_post_update(ip, idx + 1, state, _THIS_IP_);
992 *dnew = temp;
993 /* DELTA: One in-core extent is split in two. */
994 temp = PREV.br_startoff;
995 temp2 = PREV.br_blockcount;
996 break;
997
998 case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
999 /*
1000 * Filling in the last part of a previous delayed allocation.
1001 * The right neighbor is contiguous with the new allocation.
1002 */
1003 temp = PREV.br_blockcount - new->br_blockcount;
1004 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
1005 trace_xfs_bmap_pre_update(ip, idx + 1, state, _THIS_IP_);
1006 xfs_bmbt_set_blockcount(ep, temp);
1007 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, idx + 1),
1008 new->br_startoff, new->br_startblock,
1009 new->br_blockcount + RIGHT.br_blockcount,
1010 RIGHT.br_state);
1011 trace_xfs_bmap_post_update(ip, idx + 1, state, _THIS_IP_);
1012 ip->i_df.if_lastex = idx + 1;
1013 if (cur == NULL)
1014 rval = XFS_ILOG_DEXT;
1015 else {
1016 rval = 0;
1017 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1018 RIGHT.br_startblock,
1019 RIGHT.br_blockcount, &i)))
1020 goto done;
1021 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1022 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1023 new->br_startblock,
1024 new->br_blockcount +
1025 RIGHT.br_blockcount,
1026 RIGHT.br_state)))
1027 goto done;
1028 }
1029 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1030 startblockval(PREV.br_startblock));
1031 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
1032 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
1033 *dnew = temp;
1034 /* DELTA: The boundary between two in-core extents moved. */
1035 temp = PREV.br_startoff;
1036 temp2 = PREV.br_blockcount +
1037 RIGHT.br_blockcount;
1038 break;
1039
1040 case BMAP_RIGHT_FILLING:
1041 /*
1042 * Filling in the last part of a previous delayed allocation.
1043 * The right neighbor is not contiguous.
1044 */
1045 temp = PREV.br_blockcount - new->br_blockcount;
1046 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
1047 xfs_bmbt_set_blockcount(ep, temp);
1048 xfs_iext_insert(ip, idx + 1, 1, new, state);
1049 ip->i_df.if_lastex = idx + 1;
1050 ip->i_d.di_nextents++;
1051 if (cur == NULL)
1052 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1053 else {
1054 rval = XFS_ILOG_CORE;
1055 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1056 new->br_startblock, new->br_blockcount,
1057 &i)))
1058 goto done;
1059 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1060 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1061 if ((error = xfs_btree_insert(cur, &i)))
1062 goto done;
1063 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1064 }
1065 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1066 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1067 error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
1068 first, flist, &cur, 1, &tmp_rval,
1069 XFS_DATA_FORK);
1070 rval |= tmp_rval;
1071 if (error)
1072 goto done;
1073 }
1074 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1075 startblockval(PREV.br_startblock) -
1076 (cur ? cur->bc_private.b.allocated : 0));
1077 ep = xfs_iext_get_ext(ifp, idx);
1078 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
1079 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
1080 *dnew = temp;
1081 /* DELTA: One in-core extent is split in two. */
1082 temp = PREV.br_startoff;
1083 temp2 = PREV.br_blockcount;
1084 break;
1085
1086 case 0:
1087 /*
1088 * Filling in the middle part of a previous delayed allocation.
1089 * Contiguity is impossible here.
1090 * This case is avoided almost all the time.
1091 */
1092 temp = new->br_startoff - PREV.br_startoff;
1093 trace_xfs_bmap_pre_update(ip, idx, 0, _THIS_IP_);
1094 xfs_bmbt_set_blockcount(ep, temp);
1095 r[0] = *new;
1096 r[1].br_state = PREV.br_state;
1097 r[1].br_startblock = 0;
1098 r[1].br_startoff = new_endoff;
1099 temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
1100 r[1].br_blockcount = temp2;
1101 xfs_iext_insert(ip, idx + 1, 2, &r[0], state);
1102 ip->i_df.if_lastex = idx + 1;
1103 ip->i_d.di_nextents++;
1104 if (cur == NULL)
1105 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1106 else {
1107 rval = XFS_ILOG_CORE;
1108 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1109 new->br_startblock, new->br_blockcount,
1110 &i)))
1111 goto done;
1112 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1113 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1114 if ((error = xfs_btree_insert(cur, &i)))
1115 goto done;
1116 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1117 }
1118 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1119 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1120 error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
1121 first, flist, &cur, 1, &tmp_rval,
1122 XFS_DATA_FORK);
1123 rval |= tmp_rval;
1124 if (error)
1125 goto done;
1126 }
1127 temp = xfs_bmap_worst_indlen(ip, temp);
1128 temp2 = xfs_bmap_worst_indlen(ip, temp2);
1129 diff = (int)(temp + temp2 - startblockval(PREV.br_startblock) -
1130 (cur ? cur->bc_private.b.allocated : 0));
1131 if (diff > 0 &&
1132 xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS, -((int64_t)diff), rsvd)) {
1133 /*
1134 * Ick gross gag me with a spoon.
1135 */
1136 ASSERT(0); /* want to see if this ever happens! */
1137 while (diff > 0) {
1138 if (temp) {
1139 temp--;
1140 diff--;
1141 if (!diff ||
1142 !xfs_mod_incore_sb(ip->i_mount,
1143 XFS_SBS_FDBLOCKS, -((int64_t)diff), rsvd))
1144 break;
1145 }
1146 if (temp2) {
1147 temp2--;
1148 diff--;
1149 if (!diff ||
1150 !xfs_mod_incore_sb(ip->i_mount,
1151 XFS_SBS_FDBLOCKS, -((int64_t)diff), rsvd))
1152 break;
1153 }
1154 }
1155 }
1156 ep = xfs_iext_get_ext(ifp, idx);
1157 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
1158 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
1159 trace_xfs_bmap_pre_update(ip, idx + 2, state, _THIS_IP_);
1160 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, idx + 2),
1161 nullstartblock((int)temp2));
1162 trace_xfs_bmap_post_update(ip, idx + 2, state, _THIS_IP_);
1163 *dnew = temp + temp2;
1164 /* DELTA: One in-core extent is split in three. */
1165 temp = PREV.br_startoff;
1166 temp2 = PREV.br_blockcount;
1167 break;
1168
1169 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1170 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1171 case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
1172 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1173 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1174 case BMAP_LEFT_CONTIG:
1175 case BMAP_RIGHT_CONTIG:
1176 /*
1177 * These cases are all impossible.
1178 */
1179 ASSERT(0);
1180 }
1181 *curp = cur;
1182 if (delta) {
1183 temp2 += temp;
1184 if (delta->xed_startoff > temp)
1185 delta->xed_startoff = temp;
1186 if (delta->xed_blockcount < temp2)
1187 delta->xed_blockcount = temp2;
1188 }
1189 done:
1190 *logflagsp = rval;
1191 return error;
1192 #undef LEFT
1193 #undef RIGHT
1194 #undef PREV
1195 }
1196
1197 /*
1198 * Called by xfs_bmap_add_extent to handle cases converting an unwritten
1199 * allocation to a real allocation or vice versa.
1200 */
1201 STATIC int /* error */
1202 xfs_bmap_add_extent_unwritten_real(
1203 xfs_inode_t *ip, /* incore inode pointer */
1204 xfs_extnum_t idx, /* extent number to update/insert */
1205 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
1206 xfs_bmbt_irec_t *new, /* new data to add to file extents */
1207 int *logflagsp, /* inode logging flags */
1208 xfs_extdelta_t *delta) /* Change made to incore extents */
1209 {
1210 xfs_btree_cur_t *cur; /* btree cursor */
1211 xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
1212 int error; /* error return value */
1213 int i; /* temp state */
1214 xfs_ifork_t *ifp; /* inode fork pointer */
1215 xfs_fileoff_t new_endoff; /* end offset of new entry */
1216 xfs_exntst_t newext; /* new extent state */
1217 xfs_exntst_t oldext; /* old extent state */
1218 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
1219 /* left is 0, right is 1, prev is 2 */
1220 int rval=0; /* return value (logging flags) */
1221 int state = 0;/* state bits, accessed thru macros */
1222 xfs_filblks_t temp=0;
1223 xfs_filblks_t temp2=0;
1224
1225 #define LEFT r[0]
1226 #define RIGHT r[1]
1227 #define PREV r[2]
1228 /*
1229 * Set up a bunch of variables to make the tests simpler.
1230 */
1231 error = 0;
1232 cur = *curp;
1233 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1234 ep = xfs_iext_get_ext(ifp, idx);
1235 xfs_bmbt_get_all(ep, &PREV);
1236 newext = new->br_state;
1237 oldext = (newext == XFS_EXT_UNWRITTEN) ?
1238 XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
1239 ASSERT(PREV.br_state == oldext);
1240 new_endoff = new->br_startoff + new->br_blockcount;
1241 ASSERT(PREV.br_startoff <= new->br_startoff);
1242 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
1243
1244 /*
1245 * Set flags determining what part of the previous oldext allocation
1246 * extent is being replaced by a newext allocation.
1247 */
1248 if (PREV.br_startoff == new->br_startoff)
1249 state |= BMAP_LEFT_FILLING;
1250 if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
1251 state |= BMAP_RIGHT_FILLING;
1252
1253 /*
1254 * Check and set flags if this segment has a left neighbor.
1255 * Don't set contiguous if the combined extent would be too large.
1256 */
1257 if (idx > 0) {
1258 state |= BMAP_LEFT_VALID;
1259 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &LEFT);
1260
1261 if (isnullstartblock(LEFT.br_startblock))
1262 state |= BMAP_LEFT_DELAY;
1263 }
1264
1265 if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
1266 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
1267 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
1268 LEFT.br_state == newext &&
1269 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1270 state |= BMAP_LEFT_CONTIG;
1271
1272 /*
1273 * Check and set flags if this segment has a right neighbor.
1274 * Don't set contiguous if the combined extent would be too large.
1275 * Also check for all-three-contiguous being too large.
1276 */
1277 if (idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
1278 state |= BMAP_RIGHT_VALID;
1279 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx + 1), &RIGHT);
1280 if (isnullstartblock(RIGHT.br_startblock))
1281 state |= BMAP_RIGHT_DELAY;
1282 }
1283
1284 if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
1285 new_endoff == RIGHT.br_startoff &&
1286 new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
1287 newext == RIGHT.br_state &&
1288 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
1289 ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
1290 BMAP_RIGHT_FILLING)) !=
1291 (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
1292 BMAP_RIGHT_FILLING) ||
1293 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
1294 <= MAXEXTLEN))
1295 state |= BMAP_RIGHT_CONTIG;
1296
1297 /*
1298 * Switch out based on the FILLING and CONTIG state bits.
1299 */
1300 switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
1301 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
1302 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
1303 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1304 /*
1305 * Setting all of a previous oldext extent to newext.
1306 * The left and right neighbors are both contiguous with new.
1307 */
1308 trace_xfs_bmap_pre_update(ip, idx - 1, state, _THIS_IP_);
1309 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
1310 LEFT.br_blockcount + PREV.br_blockcount +
1311 RIGHT.br_blockcount);
1312 trace_xfs_bmap_post_update(ip, idx - 1, state, _THIS_IP_);
1313
1314 xfs_iext_remove(ip, idx, 2, state);
1315 ip->i_df.if_lastex = idx - 1;
1316 ip->i_d.di_nextents -= 2;
1317 if (cur == NULL)
1318 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1319 else {
1320 rval = XFS_ILOG_CORE;
1321 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1322 RIGHT.br_startblock,
1323 RIGHT.br_blockcount, &i)))
1324 goto done;
1325 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1326 if ((error = xfs_btree_delete(cur, &i)))
1327 goto done;
1328 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1329 if ((error = xfs_btree_decrement(cur, 0, &i)))
1330 goto done;
1331 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1332 if ((error = xfs_btree_delete(cur, &i)))
1333 goto done;
1334 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1335 if ((error = xfs_btree_decrement(cur, 0, &i)))
1336 goto done;
1337 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1338 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1339 LEFT.br_startblock,
1340 LEFT.br_blockcount + PREV.br_blockcount +
1341 RIGHT.br_blockcount, LEFT.br_state)))
1342 goto done;
1343 }
1344 /* DELTA: Three in-core extents are replaced by one. */
1345 temp = LEFT.br_startoff;
1346 temp2 = LEFT.br_blockcount +
1347 PREV.br_blockcount +
1348 RIGHT.br_blockcount;
1349 break;
1350
1351 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1352 /*
1353 * Setting all of a previous oldext extent to newext.
1354 * The left neighbor is contiguous, the right is not.
1355 */
1356 trace_xfs_bmap_pre_update(ip, idx - 1, state, _THIS_IP_);
1357 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
1358 LEFT.br_blockcount + PREV.br_blockcount);
1359 trace_xfs_bmap_post_update(ip, idx - 1, state, _THIS_IP_);
1360
1361 ip->i_df.if_lastex = idx - 1;
1362 xfs_iext_remove(ip, idx, 1, state);
1363 ip->i_d.di_nextents--;
1364 if (cur == NULL)
1365 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1366 else {
1367 rval = XFS_ILOG_CORE;
1368 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1369 PREV.br_startblock, PREV.br_blockcount,
1370 &i)))
1371 goto done;
1372 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1373 if ((error = xfs_btree_delete(cur, &i)))
1374 goto done;
1375 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1376 if ((error = xfs_btree_decrement(cur, 0, &i)))
1377 goto done;
1378 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1379 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1380 LEFT.br_startblock,
1381 LEFT.br_blockcount + PREV.br_blockcount,
1382 LEFT.br_state)))
1383 goto done;
1384 }
1385 /* DELTA: Two in-core extents are replaced by one. */
1386 temp = LEFT.br_startoff;
1387 temp2 = LEFT.br_blockcount +
1388 PREV.br_blockcount;
1389 break;
1390
1391 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1392 /*
1393 * Setting all of a previous oldext extent to newext.
1394 * The right neighbor is contiguous, the left is not.
1395 */
1396 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
1397 xfs_bmbt_set_blockcount(ep,
1398 PREV.br_blockcount + RIGHT.br_blockcount);
1399 xfs_bmbt_set_state(ep, newext);
1400 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
1401 ip->i_df.if_lastex = idx;
1402 xfs_iext_remove(ip, idx + 1, 1, state);
1403 ip->i_d.di_nextents--;
1404 if (cur == NULL)
1405 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1406 else {
1407 rval = XFS_ILOG_CORE;
1408 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1409 RIGHT.br_startblock,
1410 RIGHT.br_blockcount, &i)))
1411 goto done;
1412 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1413 if ((error = xfs_btree_delete(cur, &i)))
1414 goto done;
1415 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1416 if ((error = xfs_btree_decrement(cur, 0, &i)))
1417 goto done;
1418 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1419 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1420 new->br_startblock,
1421 new->br_blockcount + RIGHT.br_blockcount,
1422 newext)))
1423 goto done;
1424 }
1425 /* DELTA: Two in-core extents are replaced by one. */
1426 temp = PREV.br_startoff;
1427 temp2 = PREV.br_blockcount +
1428 RIGHT.br_blockcount;
1429 break;
1430
1431 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
1432 /*
1433 * Setting all of a previous oldext extent to newext.
1434 * Neither the left nor right neighbors are contiguous with
1435 * the new one.
1436 */
1437 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
1438 xfs_bmbt_set_state(ep, newext);
1439 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
1440
1441 ip->i_df.if_lastex = idx;
1442 if (cur == NULL)
1443 rval = XFS_ILOG_DEXT;
1444 else {
1445 rval = 0;
1446 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1447 new->br_startblock, new->br_blockcount,
1448 &i)))
1449 goto done;
1450 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1451 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1452 new->br_startblock, new->br_blockcount,
1453 newext)))
1454 goto done;
1455 }
1456 /* DELTA: The in-core extent described by new changed type. */
1457 temp = new->br_startoff;
1458 temp2 = new->br_blockcount;
1459 break;
1460
1461 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
1462 /*
1463 * Setting the first part of a previous oldext extent to newext.
1464 * The left neighbor is contiguous.
1465 */
1466 trace_xfs_bmap_pre_update(ip, idx - 1, state, _THIS_IP_);
1467 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
1468 LEFT.br_blockcount + new->br_blockcount);
1469 xfs_bmbt_set_startoff(ep,
1470 PREV.br_startoff + new->br_blockcount);
1471 trace_xfs_bmap_post_update(ip, idx - 1, state, _THIS_IP_);
1472
1473 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
1474 xfs_bmbt_set_startblock(ep,
1475 new->br_startblock + new->br_blockcount);
1476 xfs_bmbt_set_blockcount(ep,
1477 PREV.br_blockcount - new->br_blockcount);
1478 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
1479
1480 ip->i_df.if_lastex = idx - 1;
1481 if (cur == NULL)
1482 rval = XFS_ILOG_DEXT;
1483 else {
1484 rval = 0;
1485 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1486 PREV.br_startblock, PREV.br_blockcount,
1487 &i)))
1488 goto done;
1489 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1490 if ((error = xfs_bmbt_update(cur,
1491 PREV.br_startoff + new->br_blockcount,
1492 PREV.br_startblock + new->br_blockcount,
1493 PREV.br_blockcount - new->br_blockcount,
1494 oldext)))
1495 goto done;
1496 if ((error = xfs_btree_decrement(cur, 0, &i)))
1497 goto done;
1498 if (xfs_bmbt_update(cur, LEFT.br_startoff,
1499 LEFT.br_startblock,
1500 LEFT.br_blockcount + new->br_blockcount,
1501 LEFT.br_state))
1502 goto done;
1503 }
1504 /* DELTA: The boundary between two in-core extents moved. */
1505 temp = LEFT.br_startoff;
1506 temp2 = LEFT.br_blockcount +
1507 PREV.br_blockcount;
1508 break;
1509
1510 case BMAP_LEFT_FILLING:
1511 /*
1512 * Setting the first part of a previous oldext extent to newext.
1513 * The left neighbor is not contiguous.
1514 */
1515 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
1516 ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
1517 xfs_bmbt_set_startoff(ep, new_endoff);
1518 xfs_bmbt_set_blockcount(ep,
1519 PREV.br_blockcount - new->br_blockcount);
1520 xfs_bmbt_set_startblock(ep,
1521 new->br_startblock + new->br_blockcount);
1522 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
1523
1524 xfs_iext_insert(ip, idx, 1, new, state);
1525 ip->i_df.if_lastex = idx;
1526 ip->i_d.di_nextents++;
1527 if (cur == NULL)
1528 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1529 else {
1530 rval = XFS_ILOG_CORE;
1531 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1532 PREV.br_startblock, PREV.br_blockcount,
1533 &i)))
1534 goto done;
1535 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1536 if ((error = xfs_bmbt_update(cur,
1537 PREV.br_startoff + new->br_blockcount,
1538 PREV.br_startblock + new->br_blockcount,
1539 PREV.br_blockcount - new->br_blockcount,
1540 oldext)))
1541 goto done;
1542 cur->bc_rec.b = *new;
1543 if ((error = xfs_btree_insert(cur, &i)))
1544 goto done;
1545 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1546 }
1547 /* DELTA: One in-core extent is split in two. */
1548 temp = PREV.br_startoff;
1549 temp2 = PREV.br_blockcount;
1550 break;
1551
1552 case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1553 /*
1554 * Setting the last part of a previous oldext extent to newext.
1555 * The right neighbor is contiguous with the new allocation.
1556 */
1557 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
1558 trace_xfs_bmap_pre_update(ip, idx + 1, state, _THIS_IP_);
1559 xfs_bmbt_set_blockcount(ep,
1560 PREV.br_blockcount - new->br_blockcount);
1561 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
1562 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, idx + 1),
1563 new->br_startoff, new->br_startblock,
1564 new->br_blockcount + RIGHT.br_blockcount, newext);
1565 trace_xfs_bmap_post_update(ip, idx + 1, state, _THIS_IP_);
1566
1567 ip->i_df.if_lastex = idx + 1;
1568 if (cur == NULL)
1569 rval = XFS_ILOG_DEXT;
1570 else {
1571 rval = 0;
1572 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1573 PREV.br_startblock,
1574 PREV.br_blockcount, &i)))
1575 goto done;
1576 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1577 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1578 PREV.br_startblock,
1579 PREV.br_blockcount - new->br_blockcount,
1580 oldext)))
1581 goto done;
1582 if ((error = xfs_btree_increment(cur, 0, &i)))
1583 goto done;
1584 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1585 new->br_startblock,
1586 new->br_blockcount + RIGHT.br_blockcount,
1587 newext)))
1588 goto done;
1589 }
1590 /* DELTA: The boundary between two in-core extents moved. */
1591 temp = PREV.br_startoff;
1592 temp2 = PREV.br_blockcount +
1593 RIGHT.br_blockcount;
1594 break;
1595
1596 case BMAP_RIGHT_FILLING:
1597 /*
1598 * Setting the last part of a previous oldext extent to newext.
1599 * The right neighbor is not contiguous.
1600 */
1601 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
1602 xfs_bmbt_set_blockcount(ep,
1603 PREV.br_blockcount - new->br_blockcount);
1604 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
1605
1606 xfs_iext_insert(ip, idx + 1, 1, new, state);
1607 ip->i_df.if_lastex = idx + 1;
1608 ip->i_d.di_nextents++;
1609 if (cur == NULL)
1610 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1611 else {
1612 rval = XFS_ILOG_CORE;
1613 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1614 PREV.br_startblock, PREV.br_blockcount,
1615 &i)))
1616 goto done;
1617 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1618 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1619 PREV.br_startblock,
1620 PREV.br_blockcount - new->br_blockcount,
1621 oldext)))
1622 goto done;
1623 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1624 new->br_startblock, new->br_blockcount,
1625 &i)))
1626 goto done;
1627 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1628 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1629 if ((error = xfs_btree_insert(cur, &i)))
1630 goto done;
1631 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1632 }
1633 /* DELTA: One in-core extent is split in two. */
1634 temp = PREV.br_startoff;
1635 temp2 = PREV.br_blockcount;
1636 break;
1637
1638 case 0:
1639 /*
1640 * Setting the middle part of a previous oldext extent to
1641 * newext. Contiguity is impossible here.
1642 * One extent becomes three extents.
1643 */
1644 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
1645 xfs_bmbt_set_blockcount(ep,
1646 new->br_startoff - PREV.br_startoff);
1647 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
1648
1649 r[0] = *new;
1650 r[1].br_startoff = new_endoff;
1651 r[1].br_blockcount =
1652 PREV.br_startoff + PREV.br_blockcount - new_endoff;
1653 r[1].br_startblock = new->br_startblock + new->br_blockcount;
1654 r[1].br_state = oldext;
1655 xfs_iext_insert(ip, idx + 1, 2, &r[0], state);
1656 ip->i_df.if_lastex = idx + 1;
1657 ip->i_d.di_nextents += 2;
1658 if (cur == NULL)
1659 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1660 else {
1661 rval = XFS_ILOG_CORE;
1662 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1663 PREV.br_startblock, PREV.br_blockcount,
1664 &i)))
1665 goto done;
1666 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1667 /* new right extent - oldext */
1668 if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
1669 r[1].br_startblock, r[1].br_blockcount,
1670 r[1].br_state)))
1671 goto done;
1672 /* new left extent - oldext */
1673 cur->bc_rec.b = PREV;
1674 cur->bc_rec.b.br_blockcount =
1675 new->br_startoff - PREV.br_startoff;
1676 if ((error = xfs_btree_insert(cur, &i)))
1677 goto done;
1678 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1679 /*
1680 * Reset the cursor to the position of the new extent
1681 * we are about to insert as we can't trust it after
1682 * the previous insert.
1683 */
1684 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1685 new->br_startblock, new->br_blockcount,
1686 &i)))
1687 goto done;
1688 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1689 /* new middle extent - newext */
1690 cur->bc_rec.b.br_state = new->br_state;
1691 if ((error = xfs_btree_insert(cur, &i)))
1692 goto done;
1693 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1694 }
1695 /* DELTA: One in-core extent is split in three. */
1696 temp = PREV.br_startoff;
1697 temp2 = PREV.br_blockcount;
1698 break;
1699
1700 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1701 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1702 case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
1703 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1704 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1705 case BMAP_LEFT_CONTIG:
1706 case BMAP_RIGHT_CONTIG:
1707 /*
1708 * These cases are all impossible.
1709 */
1710 ASSERT(0);
1711 }
1712 *curp = cur;
1713 if (delta) {
1714 temp2 += temp;
1715 if (delta->xed_startoff > temp)
1716 delta->xed_startoff = temp;
1717 if (delta->xed_blockcount < temp2)
1718 delta->xed_blockcount = temp2;
1719 }
1720 done:
1721 *logflagsp = rval;
1722 return error;
1723 #undef LEFT
1724 #undef RIGHT
1725 #undef PREV
1726 }
1727
1728 /*
1729 * Called by xfs_bmap_add_extent to handle cases converting a hole
1730 * to a delayed allocation.
1731 */
1732 /*ARGSUSED*/
1733 STATIC int /* error */
1734 xfs_bmap_add_extent_hole_delay(
1735 xfs_inode_t *ip, /* incore inode pointer */
1736 xfs_extnum_t idx, /* extent number to update/insert */
1737 xfs_bmbt_irec_t *new, /* new data to add to file extents */
1738 int *logflagsp, /* inode logging flags */
1739 xfs_extdelta_t *delta, /* Change made to incore extents */
1740 int rsvd) /* OK to allocate reserved blocks */
1741 {
1742 xfs_bmbt_rec_host_t *ep; /* extent record for idx */
1743 xfs_ifork_t *ifp; /* inode fork pointer */
1744 xfs_bmbt_irec_t left; /* left neighbor extent entry */
1745 xfs_filblks_t newlen=0; /* new indirect size */
1746 xfs_filblks_t oldlen=0; /* old indirect size */
1747 xfs_bmbt_irec_t right; /* right neighbor extent entry */
1748 int state; /* state bits, accessed thru macros */
1749 xfs_filblks_t temp=0; /* temp for indirect calculations */
1750 xfs_filblks_t temp2=0;
1751
1752 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1753 ep = xfs_iext_get_ext(ifp, idx);
1754 state = 0;
1755 ASSERT(isnullstartblock(new->br_startblock));
1756
1757 /*
1758 * Check and set flags if this segment has a left neighbor
1759 */
1760 if (idx > 0) {
1761 state |= BMAP_LEFT_VALID;
1762 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &left);
1763
1764 if (isnullstartblock(left.br_startblock))
1765 state |= BMAP_LEFT_DELAY;
1766 }
1767
1768 /*
1769 * Check and set flags if the current (right) segment exists.
1770 * If it doesn't exist, we're converting the hole at end-of-file.
1771 */
1772 if (idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
1773 state |= BMAP_RIGHT_VALID;
1774 xfs_bmbt_get_all(ep, &right);
1775
1776 if (isnullstartblock(right.br_startblock))
1777 state |= BMAP_RIGHT_DELAY;
1778 }
1779
1780 /*
1781 * Set contiguity flags on the left and right neighbors.
1782 * Don't let extents get too large, even if the pieces are contiguous.
1783 */
1784 if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) &&
1785 left.br_startoff + left.br_blockcount == new->br_startoff &&
1786 left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1787 state |= BMAP_LEFT_CONTIG;
1788
1789 if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) &&
1790 new->br_startoff + new->br_blockcount == right.br_startoff &&
1791 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
1792 (!(state & BMAP_LEFT_CONTIG) ||
1793 (left.br_blockcount + new->br_blockcount +
1794 right.br_blockcount <= MAXEXTLEN)))
1795 state |= BMAP_RIGHT_CONTIG;
1796
1797 /*
1798 * Switch out based on the contiguity flags.
1799 */
1800 switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
1801 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1802 /*
1803 * New allocation is contiguous with delayed allocations
1804 * on the left and on the right.
1805 * Merge all three into a single extent record.
1806 */
1807 temp = left.br_blockcount + new->br_blockcount +
1808 right.br_blockcount;
1809
1810 trace_xfs_bmap_pre_update(ip, idx - 1, state, _THIS_IP_);
1811 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1), temp);
1812 oldlen = startblockval(left.br_startblock) +
1813 startblockval(new->br_startblock) +
1814 startblockval(right.br_startblock);
1815 newlen = xfs_bmap_worst_indlen(ip, temp);
1816 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, idx - 1),
1817 nullstartblock((int)newlen));
1818 trace_xfs_bmap_post_update(ip, idx - 1, state, _THIS_IP_);
1819
1820 xfs_iext_remove(ip, idx, 1, state);
1821 ip->i_df.if_lastex = idx - 1;
1822 /* DELTA: Two in-core extents were replaced by one. */
1823 temp2 = temp;
1824 temp = left.br_startoff;
1825 break;
1826
1827 case BMAP_LEFT_CONTIG:
1828 /*
1829 * New allocation is contiguous with a delayed allocation
1830 * on the left.
1831 * Merge the new allocation with the left neighbor.
1832 */
1833 temp = left.br_blockcount + new->br_blockcount;
1834 trace_xfs_bmap_pre_update(ip, idx - 1, state, _THIS_IP_);
1835 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1), temp);
1836 oldlen = startblockval(left.br_startblock) +
1837 startblockval(new->br_startblock);
1838 newlen = xfs_bmap_worst_indlen(ip, temp);
1839 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, idx - 1),
1840 nullstartblock((int)newlen));
1841 trace_xfs_bmap_post_update(ip, idx - 1, state, _THIS_IP_);
1842
1843 ip->i_df.if_lastex = idx - 1;
1844 /* DELTA: One in-core extent grew into a hole. */
1845 temp2 = temp;
1846 temp = left.br_startoff;
1847 break;
1848
1849 case BMAP_RIGHT_CONTIG:
1850 /*
1851 * New allocation is contiguous with a delayed allocation
1852 * on the right.
1853 * Merge the new allocation with the right neighbor.
1854 */
1855 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
1856 temp = new->br_blockcount + right.br_blockcount;
1857 oldlen = startblockval(new->br_startblock) +
1858 startblockval(right.br_startblock);
1859 newlen = xfs_bmap_worst_indlen(ip, temp);
1860 xfs_bmbt_set_allf(ep, new->br_startoff,
1861 nullstartblock((int)newlen), temp, right.br_state);
1862 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
1863
1864 ip->i_df.if_lastex = idx;
1865 /* DELTA: One in-core extent grew into a hole. */
1866 temp2 = temp;
1867 temp = new->br_startoff;
1868 break;
1869
1870 case 0:
1871 /*
1872 * New allocation is not contiguous with another
1873 * delayed allocation.
1874 * Insert a new entry.
1875 */
1876 oldlen = newlen = 0;
1877 xfs_iext_insert(ip, idx, 1, new, state);
1878 ip->i_df.if_lastex = idx;
1879 /* DELTA: A new in-core extent was added in a hole. */
1880 temp2 = new->br_blockcount;
1881 temp = new->br_startoff;
1882 break;
1883 }
1884 if (oldlen != newlen) {
1885 ASSERT(oldlen > newlen);
1886 xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
1887 (int64_t)(oldlen - newlen), rsvd);
1888 /*
1889 * Nothing to do for disk quota accounting here.
1890 */
1891 }
1892 if (delta) {
1893 temp2 += temp;
1894 if (delta->xed_startoff > temp)
1895 delta->xed_startoff = temp;
1896 if (delta->xed_blockcount < temp2)
1897 delta->xed_blockcount = temp2;
1898 }
1899 *logflagsp = 0;
1900 return 0;
1901 }
1902
1903 /*
1904 * Called by xfs_bmap_add_extent to handle cases converting a hole
1905 * to a real allocation.
1906 */
1907 STATIC int /* error */
1908 xfs_bmap_add_extent_hole_real(
1909 xfs_inode_t *ip, /* incore inode pointer */
1910 xfs_extnum_t idx, /* extent number to update/insert */
1911 xfs_btree_cur_t *cur, /* if null, not a btree */
1912 xfs_bmbt_irec_t *new, /* new data to add to file extents */
1913 int *logflagsp, /* inode logging flags */
1914 xfs_extdelta_t *delta, /* Change made to incore extents */
1915 int whichfork) /* data or attr fork */
1916 {
1917 xfs_bmbt_rec_host_t *ep; /* pointer to extent entry ins. point */
1918 int error; /* error return value */
1919 int i; /* temp state */
1920 xfs_ifork_t *ifp; /* inode fork pointer */
1921 xfs_bmbt_irec_t left; /* left neighbor extent entry */
1922 xfs_bmbt_irec_t right; /* right neighbor extent entry */
1923 int rval=0; /* return value (logging flags) */
1924 int state; /* state bits, accessed thru macros */
1925 xfs_filblks_t temp=0;
1926 xfs_filblks_t temp2=0;
1927
1928 ifp = XFS_IFORK_PTR(ip, whichfork);
1929 ASSERT(idx <= ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
1930 ep = xfs_iext_get_ext(ifp, idx);
1931 state = 0;
1932
1933 if (whichfork == XFS_ATTR_FORK)
1934 state |= BMAP_ATTRFORK;
1935
1936 /*
1937 * Check and set flags if this segment has a left neighbor.
1938 */
1939 if (idx > 0) {
1940 state |= BMAP_LEFT_VALID;
1941 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &left);
1942 if (isnullstartblock(left.br_startblock))
1943 state |= BMAP_LEFT_DELAY;
1944 }
1945
1946 /*
1947 * Check and set flags if this segment has a current value.
1948 * Not true if we're inserting into the "hole" at eof.
1949 */
1950 if (idx < ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
1951 state |= BMAP_RIGHT_VALID;
1952 xfs_bmbt_get_all(ep, &right);
1953 if (isnullstartblock(right.br_startblock))
1954 state |= BMAP_RIGHT_DELAY;
1955 }
1956
1957 /*
1958 * We're inserting a real allocation between "left" and "right".
1959 * Set the contiguity flags. Don't let extents get too large.
1960 */
1961 if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
1962 left.br_startoff + left.br_blockcount == new->br_startoff &&
1963 left.br_startblock + left.br_blockcount == new->br_startblock &&
1964 left.br_state == new->br_state &&
1965 left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1966 state |= BMAP_LEFT_CONTIG;
1967
1968 if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
1969 new->br_startoff + new->br_blockcount == right.br_startoff &&
1970 new->br_startblock + new->br_blockcount == right.br_startblock &&
1971 new->br_state == right.br_state &&
1972 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
1973 (!(state & BMAP_LEFT_CONTIG) ||
1974 left.br_blockcount + new->br_blockcount +
1975 right.br_blockcount <= MAXEXTLEN))
1976 state |= BMAP_RIGHT_CONTIG;
1977
1978 error = 0;
1979 /*
1980 * Select which case we're in here, and implement it.
1981 */
1982 switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
1983 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1984 /*
1985 * New allocation is contiguous with real allocations on the
1986 * left and on the right.
1987 * Merge all three into a single extent record.
1988 */
1989 trace_xfs_bmap_pre_update(ip, idx - 1, state, _THIS_IP_);
1990 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
1991 left.br_blockcount + new->br_blockcount +
1992 right.br_blockcount);
1993 trace_xfs_bmap_post_update(ip, idx - 1, state, _THIS_IP_);
1994
1995 xfs_iext_remove(ip, idx, 1, state);
1996 ifp->if_lastex = idx - 1;
1997 XFS_IFORK_NEXT_SET(ip, whichfork,
1998 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
1999 if (cur == NULL) {
2000 rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
2001 } else {
2002 rval = XFS_ILOG_CORE;
2003 if ((error = xfs_bmbt_lookup_eq(cur,
2004 right.br_startoff,
2005 right.br_startblock,
2006 right.br_blockcount, &i)))
2007 goto done;
2008 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2009 if ((error = xfs_btree_delete(cur, &i)))
2010 goto done;
2011 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2012 if ((error = xfs_btree_decrement(cur, 0, &i)))
2013 goto done;
2014 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2015 if ((error = xfs_bmbt_update(cur, left.br_startoff,
2016 left.br_startblock,
2017 left.br_blockcount +
2018 new->br_blockcount +
2019 right.br_blockcount,
2020 left.br_state)))
2021 goto done;
2022 }
2023 /* DELTA: Two in-core extents were replaced by one. */
2024 temp = left.br_startoff;
2025 temp2 = left.br_blockcount +
2026 new->br_blockcount +
2027 right.br_blockcount;
2028 break;
2029
2030 case BMAP_LEFT_CONTIG:
2031 /*
2032 * New allocation is contiguous with a real allocation
2033 * on the left.
2034 * Merge the new allocation with the left neighbor.
2035 */
2036 trace_xfs_bmap_pre_update(ip, idx - 1, state, _THIS_IP_);
2037 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
2038 left.br_blockcount + new->br_blockcount);
2039 trace_xfs_bmap_post_update(ip, idx - 1, state, _THIS_IP_);
2040
2041 ifp->if_lastex = idx - 1;
2042 if (cur == NULL) {
2043 rval = xfs_ilog_fext(whichfork);
2044 } else {
2045 rval = 0;
2046 if ((error = xfs_bmbt_lookup_eq(cur,
2047 left.br_startoff,
2048 left.br_startblock,
2049 left.br_blockcount, &i)))
2050 goto done;
2051 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2052 if ((error = xfs_bmbt_update(cur, left.br_startoff,
2053 left.br_startblock,
2054 left.br_blockcount +
2055 new->br_blockcount,
2056 left.br_state)))
2057 goto done;
2058 }
2059 /* DELTA: One in-core extent grew. */
2060 temp = left.br_startoff;
2061 temp2 = left.br_blockcount +
2062 new->br_blockcount;
2063 break;
2064
2065 case BMAP_RIGHT_CONTIG:
2066 /*
2067 * New allocation is contiguous with a real allocation
2068 * on the right.
2069 * Merge the new allocation with the right neighbor.
2070 */
2071 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
2072 xfs_bmbt_set_allf(ep, new->br_startoff, new->br_startblock,
2073 new->br_blockcount + right.br_blockcount,
2074 right.br_state);
2075 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
2076
2077 ifp->if_lastex = idx;
2078 if (cur == NULL) {
2079 rval = xfs_ilog_fext(whichfork);
2080 } else {
2081 rval = 0;
2082 if ((error = xfs_bmbt_lookup_eq(cur,
2083 right.br_startoff,
2084 right.br_startblock,
2085 right.br_blockcount, &i)))
2086 goto done;
2087 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2088 if ((error = xfs_bmbt_update(cur, new->br_startoff,
2089 new->br_startblock,
2090 new->br_blockcount +
2091 right.br_blockcount,
2092 right.br_state)))
2093 goto done;
2094 }
2095 /* DELTA: One in-core extent grew. */
2096 temp = new->br_startoff;
2097 temp2 = new->br_blockcount +
2098 right.br_blockcount;
2099 break;
2100
2101 case 0:
2102 /*
2103 * New allocation is not contiguous with another
2104 * real allocation.
2105 * Insert a new entry.
2106 */
2107 xfs_iext_insert(ip, idx, 1, new, state);
2108 ifp->if_lastex = idx;
2109 XFS_IFORK_NEXT_SET(ip, whichfork,
2110 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
2111 if (cur == NULL) {
2112 rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
2113 } else {
2114 rval = XFS_ILOG_CORE;
2115 if ((error = xfs_bmbt_lookup_eq(cur,
2116 new->br_startoff,
2117 new->br_startblock,
2118 new->br_blockcount, &i)))
2119 goto done;
2120 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
2121 cur->bc_rec.b.br_state = new->br_state;
2122 if ((error = xfs_btree_insert(cur, &i)))
2123 goto done;
2124 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2125 }
2126 /* DELTA: A new extent was added in a hole. */
2127 temp = new->br_startoff;
2128 temp2 = new->br_blockcount;
2129 break;
2130 }
2131 if (delta) {
2132 temp2 += temp;
2133 if (delta->xed_startoff > temp)
2134 delta->xed_startoff = temp;
2135 if (delta->xed_blockcount < temp2)
2136 delta->xed_blockcount = temp2;
2137 }
2138 done:
2139 *logflagsp = rval;
2140 return error;
2141 }
2142
2143 /*
2144 * Adjust the size of the new extent based on di_extsize and rt extsize.
2145 */
2146 STATIC int
2147 xfs_bmap_extsize_align(
2148 xfs_mount_t *mp,
2149 xfs_bmbt_irec_t *gotp, /* next extent pointer */
2150 xfs_bmbt_irec_t *prevp, /* previous extent pointer */
2151 xfs_extlen_t extsz, /* align to this extent size */
2152 int rt, /* is this a realtime inode? */
2153 int eof, /* is extent at end-of-file? */
2154 int delay, /* creating delalloc extent? */
2155 int convert, /* overwriting unwritten extent? */
2156 xfs_fileoff_t *offp, /* in/out: aligned offset */
2157 xfs_extlen_t *lenp) /* in/out: aligned length */
2158 {
2159 xfs_fileoff_t orig_off; /* original offset */
2160 xfs_extlen_t orig_alen; /* original length */
2161 xfs_fileoff_t orig_end; /* original off+len */
2162 xfs_fileoff_t nexto; /* next file offset */
2163 xfs_fileoff_t prevo; /* previous file offset */
2164 xfs_fileoff_t align_off; /* temp for offset */
2165 xfs_extlen_t align_alen; /* temp for length */
2166 xfs_extlen_t temp; /* temp for calculations */
2167
2168 if (convert)
2169 return 0;
2170
2171 orig_off = align_off = *offp;
2172 orig_alen = align_alen = *lenp;
2173 orig_end = orig_off + orig_alen;
2174
2175 /*
2176 * If this request overlaps an existing extent, then don't
2177 * attempt to perform any additional alignment.
2178 */
2179 if (!delay && !eof &&
2180 (orig_off >= gotp->br_startoff) &&
2181 (orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
2182 return 0;
2183 }
2184
2185 /*
2186 * If the file offset is unaligned vs. the extent size
2187 * we need to align it. This will be possible unless
2188 * the file was previously written with a kernel that didn't
2189 * perform this alignment, or if a truncate shot us in the
2190 * foot.
2191 */
2192 temp = do_mod(orig_off, extsz);
2193 if (temp) {
2194 align_alen += temp;
2195 align_off -= temp;
2196 }
2197 /*
2198 * Same adjustment for the end of the requested area.
2199 */
2200 if ((temp = (align_alen % extsz))) {
2201 align_alen += extsz - temp;
2202 }
2203 /*
2204 * If the previous block overlaps with this proposed allocation
2205 * then move the start forward without adjusting the length.
2206 */
2207 if (prevp->br_startoff != NULLFILEOFF) {
2208 if (prevp->br_startblock == HOLESTARTBLOCK)
2209 prevo = prevp->br_startoff;
2210 else
2211 prevo = prevp->br_startoff + prevp->br_blockcount;
2212 } else
2213 prevo = 0;
2214 if (align_off != orig_off && align_off < prevo)
2215 align_off = prevo;
2216 /*
2217 * If the next block overlaps with this proposed allocation
2218 * then move the start back without adjusting the length,
2219 * but not before offset 0.
2220 * This may of course make the start overlap previous block,
2221 * and if we hit the offset 0 limit then the next block
2222 * can still overlap too.
2223 */
2224 if (!eof && gotp->br_startoff != NULLFILEOFF) {
2225 if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
2226 (!delay && gotp->br_startblock == DELAYSTARTBLOCK))
2227 nexto = gotp->br_startoff + gotp->br_blockcount;
2228 else
2229 nexto = gotp->br_startoff;
2230 } else
2231 nexto = NULLFILEOFF;
2232 if (!eof &&
2233 align_off + align_alen != orig_end &&
2234 align_off + align_alen > nexto)
2235 align_off = nexto > align_alen ? nexto - align_alen : 0;
2236 /*
2237 * If we're now overlapping the next or previous extent that
2238 * means we can't fit an extsz piece in this hole. Just move
2239 * the start forward to the first valid spot and set
2240 * the length so we hit the end.
2241 */
2242 if (align_off != orig_off && align_off < prevo)
2243 align_off = prevo;
2244 if (align_off + align_alen != orig_end &&
2245 align_off + align_alen > nexto &&
2246 nexto != NULLFILEOFF) {
2247 ASSERT(nexto > prevo);
2248 align_alen = nexto - align_off;
2249 }
2250
2251 /*
2252 * If realtime, and the result isn't a multiple of the realtime
2253 * extent size we need to remove blocks until it is.
2254 */
2255 if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
2256 /*
2257 * We're not covering the original request, or
2258 * we won't be able to once we fix the length.
2259 */
2260 if (orig_off < align_off ||
2261 orig_end > align_off + align_alen ||
2262 align_alen - temp < orig_alen)
2263 return XFS_ERROR(EINVAL);
2264 /*
2265 * Try to fix it by moving the start up.
2266 */
2267 if (align_off + temp <= orig_off) {
2268 align_alen -= temp;
2269 align_off += temp;
2270 }
2271 /*
2272 * Try to fix it by moving the end in.
2273 */
2274 else if (align_off + align_alen - temp >= orig_end)
2275 align_alen -= temp;
2276 /*
2277 * Set the start to the minimum then trim the length.
2278 */
2279 else {
2280 align_alen -= orig_off - align_off;
2281 align_off = orig_off;
2282 align_alen -= align_alen % mp->m_sb.sb_rextsize;
2283 }
2284 /*
2285 * Result doesn't cover the request, fail it.
2286 */
2287 if (orig_off < align_off || orig_end > align_off + align_alen)
2288 return XFS_ERROR(EINVAL);
2289 } else {
2290 ASSERT(orig_off >= align_off);
2291 ASSERT(orig_end <= align_off + align_alen);
2292 }
2293
2294 #ifdef DEBUG
2295 if (!eof && gotp->br_startoff != NULLFILEOFF)
2296 ASSERT(align_off + align_alen <= gotp->br_startoff);
2297 if (prevp->br_startoff != NULLFILEOFF)
2298 ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
2299 #endif
2300
2301 *lenp = align_alen;
2302 *offp = align_off;
2303 return 0;
2304 }
2305
2306 #define XFS_ALLOC_GAP_UNITS 4
2307
2308 STATIC void
2309 xfs_bmap_adjacent(
2310 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2311 {
2312 xfs_fsblock_t adjust; /* adjustment to block numbers */
2313 xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
2314 xfs_mount_t *mp; /* mount point structure */
2315 int nullfb; /* true if ap->firstblock isn't set */
2316 int rt; /* true if inode is realtime */
2317
2318 #define ISVALID(x,y) \
2319 (rt ? \
2320 (x) < mp->m_sb.sb_rblocks : \
2321 XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
2322 XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
2323 XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
2324
2325 mp = ap->ip->i_mount;
2326 nullfb = ap->firstblock == NULLFSBLOCK;
2327 rt = XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata;
2328 fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
2329 /*
2330 * If allocating at eof, and there's a previous real block,
2331 * try to use its last block as our starting point.
2332 */
2333 if (ap->eof && ap->prevp->br_startoff != NULLFILEOFF &&
2334 !isnullstartblock(ap->prevp->br_startblock) &&
2335 ISVALID(ap->prevp->br_startblock + ap->prevp->br_blockcount,
2336 ap->prevp->br_startblock)) {
2337 ap->rval = ap->prevp->br_startblock + ap->prevp->br_blockcount;
2338 /*
2339 * Adjust for the gap between prevp and us.
2340 */
2341 adjust = ap->off -
2342 (ap->prevp->br_startoff + ap->prevp->br_blockcount);
2343 if (adjust &&
2344 ISVALID(ap->rval + adjust, ap->prevp->br_startblock))
2345 ap->rval += adjust;
2346 }
2347 /*
2348 * If not at eof, then compare the two neighbor blocks.
2349 * Figure out whether either one gives us a good starting point,
2350 * and pick the better one.
2351 */
2352 else if (!ap->eof) {
2353 xfs_fsblock_t gotbno; /* right side block number */
2354 xfs_fsblock_t gotdiff=0; /* right side difference */
2355 xfs_fsblock_t prevbno; /* left side block number */
2356 xfs_fsblock_t prevdiff=0; /* left side difference */
2357
2358 /*
2359 * If there's a previous (left) block, select a requested
2360 * start block based on it.
2361 */
2362 if (ap->prevp->br_startoff != NULLFILEOFF &&
2363 !isnullstartblock(ap->prevp->br_startblock) &&
2364 (prevbno = ap->prevp->br_startblock +
2365 ap->prevp->br_blockcount) &&
2366 ISVALID(prevbno, ap->prevp->br_startblock)) {
2367 /*
2368 * Calculate gap to end of previous block.
2369 */
2370 adjust = prevdiff = ap->off -
2371 (ap->prevp->br_startoff +
2372 ap->prevp->br_blockcount);
2373 /*
2374 * Figure the startblock based on the previous block's
2375 * end and the gap size.
2376 * Heuristic!
2377 * If the gap is large relative to the piece we're
2378 * allocating, or using it gives us an invalid block
2379 * number, then just use the end of the previous block.
2380 */
2381 if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
2382 ISVALID(prevbno + prevdiff,
2383 ap->prevp->br_startblock))
2384 prevbno += adjust;
2385 else
2386 prevdiff += adjust;
2387 /*
2388 * If the firstblock forbids it, can't use it,
2389 * must use default.
2390 */
2391 if (!rt && !nullfb &&
2392 XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
2393 prevbno = NULLFSBLOCK;
2394 }
2395 /*
2396 * No previous block or can't follow it, just default.
2397 */
2398 else
2399 prevbno = NULLFSBLOCK;
2400 /*
2401 * If there's a following (right) block, select a requested
2402 * start block based on it.
2403 */
2404 if (!isnullstartblock(ap->gotp->br_startblock)) {
2405 /*
2406 * Calculate gap to start of next block.
2407 */
2408 adjust = gotdiff = ap->gotp->br_startoff - ap->off;
2409 /*
2410 * Figure the startblock based on the next block's
2411 * start and the gap size.
2412 */
2413 gotbno = ap->gotp->br_startblock;
2414 /*
2415 * Heuristic!
2416 * If the gap is large relative to the piece we're
2417 * allocating, or using it gives us an invalid block
2418 * number, then just use the start of the next block
2419 * offset by our length.
2420 */
2421 if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
2422 ISVALID(gotbno - gotdiff, gotbno))
2423 gotbno -= adjust;
2424 else if (ISVALID(gotbno - ap->alen, gotbno)) {
2425 gotbno -= ap->alen;
2426 gotdiff += adjust - ap->alen;
2427 } else
2428 gotdiff += adjust;
2429 /*
2430 * If the firstblock forbids it, can't use it,
2431 * must use default.
2432 */
2433 if (!rt && !nullfb &&
2434 XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
2435 gotbno = NULLFSBLOCK;
2436 }
2437 /*
2438 * No next block, just default.
2439 */
2440 else
2441 gotbno = NULLFSBLOCK;
2442 /*
2443 * If both valid, pick the better one, else the only good
2444 * one, else ap->rval is already set (to 0 or the inode block).
2445 */
2446 if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
2447 ap->rval = prevdiff <= gotdiff ? prevbno : gotbno;
2448 else if (prevbno != NULLFSBLOCK)
2449 ap->rval = prevbno;
2450 else if (gotbno != NULLFSBLOCK)
2451 ap->rval = gotbno;
2452 }
2453 #undef ISVALID
2454 }
2455
2456 STATIC int
2457 xfs_bmap_rtalloc(
2458 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2459 {
2460 xfs_alloctype_t atype = 0; /* type for allocation routines */
2461 int error; /* error return value */
2462 xfs_mount_t *mp; /* mount point structure */
2463 xfs_extlen_t prod = 0; /* product factor for allocators */
2464 xfs_extlen_t ralen = 0; /* realtime allocation length */
2465 xfs_extlen_t align; /* minimum allocation alignment */
2466 xfs_rtblock_t rtb;
2467
2468 mp = ap->ip->i_mount;
2469 align = xfs_get_extsz_hint(ap->ip);
2470 prod = align / mp->m_sb.sb_rextsize;
2471 error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
2472 align, 1, ap->eof, 0,
2473 ap->conv, &ap->off, &ap->alen);
2474 if (error)
2475 return error;
2476 ASSERT(ap->alen);
2477 ASSERT(ap->alen % mp->m_sb.sb_rextsize == 0);
2478
2479 /*
2480 * If the offset & length are not perfectly aligned
2481 * then kill prod, it will just get us in trouble.
2482 */
2483 if (do_mod(ap->off, align) || ap->alen % align)
2484 prod = 1;
2485 /*
2486 * Set ralen to be the actual requested length in rtextents.
2487 */
2488 ralen = ap->alen / mp->m_sb.sb_rextsize;
2489 /*
2490 * If the old value was close enough to MAXEXTLEN that
2491 * we rounded up to it, cut it back so it's valid again.
2492 * Note that if it's a really large request (bigger than
2493 * MAXEXTLEN), we don't hear about that number, and can't
2494 * adjust the starting point to match it.
2495 */
2496 if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
2497 ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
2498 /*
2499 * If it's an allocation to an empty file at offset 0,
2500 * pick an extent that will space things out in the rt area.
2501 */
2502 if (ap->eof && ap->off == 0) {
2503 xfs_rtblock_t uninitialized_var(rtx); /* realtime extent no */
2504
2505 error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
2506 if (error)
2507 return error;
2508 ap->rval = rtx * mp->m_sb.sb_rextsize;
2509 } else {
2510 ap->rval = 0;
2511 }
2512
2513 xfs_bmap_adjacent(ap);
2514
2515 /*
2516 * Realtime allocation, done through xfs_rtallocate_extent.
2517 */
2518 atype = ap->rval == 0 ? XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
2519 do_div(ap->rval, mp->m_sb.sb_rextsize);
2520 rtb = ap->rval;
2521 ap->alen = ralen;
2522 if ((error = xfs_rtallocate_extent(ap->tp, ap->rval, 1, ap->alen,
2523 &ralen, atype, ap->wasdel, prod, &rtb)))
2524 return error;
2525 if (rtb == NULLFSBLOCK && prod > 1 &&
2526 (error = xfs_rtallocate_extent(ap->tp, ap->rval, 1,
2527 ap->alen, &ralen, atype,
2528 ap->wasdel, 1, &rtb)))
2529 return error;
2530 ap->rval = rtb;
2531 if (ap->rval != NULLFSBLOCK) {
2532 ap->rval *= mp->m_sb.sb_rextsize;
2533 ralen *= mp->m_sb.sb_rextsize;
2534 ap->alen = ralen;
2535 ap->ip->i_d.di_nblocks += ralen;
2536 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2537 if (ap->wasdel)
2538 ap->ip->i_delayed_blks -= ralen;
2539 /*
2540 * Adjust the disk quota also. This was reserved
2541 * earlier.
2542 */
2543 xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
2544 ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
2545 XFS_TRANS_DQ_RTBCOUNT, (long) ralen);
2546 } else {
2547 ap->alen = 0;
2548 }
2549 return 0;
2550 }
2551
2552 STATIC int
2553 xfs_bmap_btalloc(
2554 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2555 {
2556 xfs_mount_t *mp; /* mount point structure */
2557 xfs_alloctype_t atype = 0; /* type for allocation routines */
2558 xfs_extlen_t align; /* minimum allocation alignment */
2559 xfs_agnumber_t ag;
2560 xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
2561 xfs_agnumber_t startag;
2562 xfs_alloc_arg_t args;
2563 xfs_extlen_t blen;
2564 xfs_extlen_t nextminlen = 0;
2565 xfs_perag_t *pag;
2566 int nullfb; /* true if ap->firstblock isn't set */
2567 int isaligned;
2568 int notinit;
2569 int tryagain;
2570 int error;
2571
2572 mp = ap->ip->i_mount;
2573 align = ap->userdata ? xfs_get_extsz_hint(ap->ip) : 0;
2574 if (unlikely(align)) {
2575 error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
2576 align, 0, ap->eof, 0, ap->conv,
2577 &ap->off, &ap->alen);
2578 ASSERT(!error);
2579 ASSERT(ap->alen);
2580 }
2581 nullfb = ap->firstblock == NULLFSBLOCK;
2582 fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
2583 if (nullfb) {
2584 if (ap->userdata && xfs_inode_is_filestream(ap->ip)) {
2585 ag = xfs_filestream_lookup_ag(ap->ip);
2586 ag = (ag != NULLAGNUMBER) ? ag : 0;
2587 ap->rval = XFS_AGB_TO_FSB(mp, ag, 0);
2588 } else {
2589 ap->rval = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
2590 }
2591 } else
2592 ap->rval = ap->firstblock;
2593
2594 xfs_bmap_adjacent(ap);
2595
2596 /*
2597 * If allowed, use ap->rval; otherwise must use firstblock since
2598 * it's in the right allocation group.
2599 */
2600 if (nullfb || XFS_FSB_TO_AGNO(mp, ap->rval) == fb_agno)
2601 ;
2602 else
2603 ap->rval = ap->firstblock;
2604 /*
2605 * Normal allocation, done through xfs_alloc_vextent.
2606 */
2607 tryagain = isaligned = 0;
2608 args.tp = ap->tp;
2609 args.mp = mp;
2610 args.fsbno = ap->rval;
2611 args.maxlen = MIN(ap->alen, mp->m_sb.sb_agblocks);
2612 args.firstblock = ap->firstblock;
2613 blen = 0;
2614 if (nullfb) {
2615 if (ap->userdata && xfs_inode_is_filestream(ap->ip))
2616 args.type = XFS_ALLOCTYPE_NEAR_BNO;
2617 else
2618 args.type = XFS_ALLOCTYPE_START_BNO;
2619 args.total = ap->total;
2620
2621 /*
2622 * Search for an allocation group with a single extent
2623 * large enough for the request.
2624 *
2625 * If one isn't found, then adjust the minimum allocation
2626 * size to the largest space found.
2627 */
2628 startag = ag = XFS_FSB_TO_AGNO(mp, args.fsbno);
2629 if (startag == NULLAGNUMBER)
2630 startag = ag = 0;
2631 notinit = 0;
2632 down_read(&mp->m_peraglock);
2633 while (blen < ap->alen) {
2634 pag = &mp->m_perag[ag];
2635 if (!pag->pagf_init &&
2636 (error = xfs_alloc_pagf_init(mp, args.tp,
2637 ag, XFS_ALLOC_FLAG_TRYLOCK))) {
2638 up_read(&mp->m_peraglock);
2639 return error;
2640 }
2641 /*
2642 * See xfs_alloc_fix_freelist...
2643 */
2644 if (pag->pagf_init) {
2645 xfs_extlen_t longest;
2646 longest = xfs_alloc_longest_free_extent(mp, pag);
2647 if (blen < longest)
2648 blen = longest;
2649 } else
2650 notinit = 1;
2651
2652 if (xfs_inode_is_filestream(ap->ip)) {
2653 if (blen >= ap->alen)
2654 break;
2655
2656 if (ap->userdata) {
2657 /*
2658 * If startag is an invalid AG, we've
2659 * come here once before and
2660 * xfs_filestream_new_ag picked the
2661 * best currently available.
2662 *
2663 * Don't continue looping, since we
2664 * could loop forever.
2665 */
2666 if (startag == NULLAGNUMBER)
2667 break;
2668
2669 error = xfs_filestream_new_ag(ap, &ag);
2670 if (error) {
2671 up_read(&mp->m_peraglock);
2672 return error;
2673 }
2674
2675 /* loop again to set 'blen'*/
2676 startag = NULLAGNUMBER;
2677 continue;
2678 }
2679 }
2680 if (++ag == mp->m_sb.sb_agcount)
2681 ag = 0;
2682 if (ag == startag)
2683 break;
2684 }
2685 up_read(&mp->m_peraglock);
2686 /*
2687 * Since the above loop did a BUF_TRYLOCK, it is
2688 * possible that there is space for this request.
2689 */
2690 if (notinit || blen < ap->minlen)
2691 args.minlen = ap->minlen;
2692 /*
2693 * If the best seen length is less than the request
2694 * length, use the best as the minimum.
2695 */
2696 else if (blen < ap->alen)
2697 args.minlen = blen;
2698 /*
2699 * Otherwise we've seen an extent as big as alen,
2700 * use that as the minimum.
2701 */
2702 else
2703 args.minlen = ap->alen;
2704
2705 /*
2706 * set the failure fallback case to look in the selected
2707 * AG as the stream may have moved.
2708 */
2709 if (xfs_inode_is_filestream(ap->ip))
2710 ap->rval = args.fsbno = XFS_AGB_TO_FSB(mp, ag, 0);
2711 } else if (ap->low) {
2712 if (xfs_inode_is_filestream(ap->ip))
2713 args.type = XFS_ALLOCTYPE_FIRST_AG;
2714 else
2715 args.type = XFS_ALLOCTYPE_START_BNO;
2716 args.total = args.minlen = ap->minlen;
2717 } else {
2718 args.type = XFS_ALLOCTYPE_NEAR_BNO;
2719 args.total = ap->total;
2720 args.minlen = ap->minlen;
2721 }
2722 /* apply extent size hints if obtained earlier */
2723 if (unlikely(align)) {
2724 args.prod = align;
2725 if ((args.mod = (xfs_extlen_t)do_mod(ap->off, args.prod)))
2726 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2727 } else if (mp->m_sb.sb_blocksize >= PAGE_CACHE_SIZE) {
2728 args.prod = 1;
2729 args.mod = 0;
2730 } else {
2731 args.prod = PAGE_CACHE_SIZE >> mp->m_sb.sb_blocklog;
2732 if ((args.mod = (xfs_extlen_t)(do_mod(ap->off, args.prod))))
2733 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2734 }
2735 /*
2736 * If we are not low on available data blocks, and the
2737 * underlying logical volume manager is a stripe, and
2738 * the file offset is zero then try to allocate data
2739 * blocks on stripe unit boundary.
2740 * NOTE: ap->aeof is only set if the allocation length
2741 * is >= the stripe unit and the allocation offset is
2742 * at the end of file.
2743 */
2744 if (!ap->low && ap->aeof) {
2745 if (!ap->off) {
2746 args.alignment = mp->m_dalign;
2747 atype = args.type;
2748 isaligned = 1;
2749 /*
2750 * Adjust for alignment
2751 */
2752 if (blen > args.alignment && blen <= ap->alen)
2753 args.minlen = blen - args.alignment;
2754 args.minalignslop = 0;
2755 } else {
2756 /*
2757 * First try an exact bno allocation.
2758 * If it fails then do a near or start bno
2759 * allocation with alignment turned on.
2760 */
2761 atype = args.type;
2762 tryagain = 1;
2763 args.type = XFS_ALLOCTYPE_THIS_BNO;
2764 args.alignment = 1;
2765 /*
2766 * Compute the minlen+alignment for the
2767 * next case. Set slop so that the value
2768 * of minlen+alignment+slop doesn't go up
2769 * between the calls.
2770 */
2771 if (blen > mp->m_dalign && blen <= ap->alen)
2772 nextminlen = blen - mp->m_dalign;
2773 else
2774 nextminlen = args.minlen;
2775 if (nextminlen + mp->m_dalign > args.minlen + 1)
2776 args.minalignslop =
2777 nextminlen + mp->m_dalign -
2778 args.minlen - 1;
2779 else
2780 args.minalignslop = 0;
2781 }
2782 } else {
2783 args.alignment = 1;
2784 args.minalignslop = 0;
2785 }
2786 args.minleft = ap->minleft;
2787 args.wasdel = ap->wasdel;
2788 args.isfl = 0;
2789 args.userdata = ap->userdata;
2790 if ((error = xfs_alloc_vextent(&args)))
2791 return error;
2792 if (tryagain && args.fsbno == NULLFSBLOCK) {
2793 /*
2794 * Exact allocation failed. Now try with alignment
2795 * turned on.
2796 */
2797 args.type = atype;
2798 args.fsbno = ap->rval;
2799 args.alignment = mp->m_dalign;
2800 args.minlen = nextminlen;
2801 args.minalignslop = 0;
2802 isaligned = 1;
2803 if ((error = xfs_alloc_vextent(&args)))
2804 return error;
2805 }
2806 if (isaligned && args.fsbno == NULLFSBLOCK) {
2807 /*
2808 * allocation failed, so turn off alignment and
2809 * try again.
2810 */
2811 args.type = atype;
2812 args.fsbno = ap->rval;
2813 args.alignment = 0;
2814 if ((error = xfs_alloc_vextent(&args)))
2815 return error;
2816 }
2817 if (args.fsbno == NULLFSBLOCK && nullfb &&
2818 args.minlen > ap->minlen) {
2819 args.minlen = ap->minlen;
2820 args.type = XFS_ALLOCTYPE_START_BNO;
2821 args.fsbno = ap->rval;
2822 if ((error = xfs_alloc_vextent(&args)))
2823 return error;
2824 }
2825 if (args.fsbno == NULLFSBLOCK && nullfb) {
2826 args.fsbno = 0;
2827 args.type = XFS_ALLOCTYPE_FIRST_AG;
2828 args.total = ap->minlen;
2829 args.minleft = 0;
2830 if ((error = xfs_alloc_vextent(&args)))
2831 return error;
2832 ap->low = 1;
2833 }
2834 if (args.fsbno != NULLFSBLOCK) {
2835 ap->firstblock = ap->rval = args.fsbno;
2836 ASSERT(nullfb || fb_agno == args.agno ||
2837 (ap->low && fb_agno < args.agno));
2838 ap->alen = args.len;
2839 ap->ip->i_d.di_nblocks += args.len;
2840 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2841 if (ap->wasdel)
2842 ap->ip->i_delayed_blks -= args.len;
2843 /*
2844 * Adjust the disk quota also. This was reserved
2845 * earlier.
2846 */
2847 xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
2848 ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
2849 XFS_TRANS_DQ_BCOUNT,
2850 (long) args.len);
2851 } else {
2852 ap->rval = NULLFSBLOCK;
2853 ap->alen = 0;
2854 }
2855 return 0;
2856 }
2857
2858 /*
2859 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
2860 * It figures out where to ask the underlying allocator to put the new extent.
2861 */
2862 STATIC int
2863 xfs_bmap_alloc(
2864 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2865 {
2866 if (XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata)
2867 return xfs_bmap_rtalloc(ap);
2868 return xfs_bmap_btalloc(ap);
2869 }
2870
2871 /*
2872 * Transform a btree format file with only one leaf node, where the
2873 * extents list will fit in the inode, into an extents format file.
2874 * Since the file extents are already in-core, all we have to do is
2875 * give up the space for the btree root and pitch the leaf block.
2876 */
2877 STATIC int /* error */
2878 xfs_bmap_btree_to_extents(
2879 xfs_trans_t *tp, /* transaction pointer */
2880 xfs_inode_t *ip, /* incore inode pointer */
2881 xfs_btree_cur_t *cur, /* btree cursor */
2882 int *logflagsp, /* inode logging flags */
2883 int whichfork) /* data or attr fork */
2884 {
2885 /* REFERENCED */
2886 struct xfs_btree_block *cblock;/* child btree block */
2887 xfs_fsblock_t cbno; /* child block number */
2888 xfs_buf_t *cbp; /* child block's buffer */
2889 int error; /* error return value */
2890 xfs_ifork_t *ifp; /* inode fork data */
2891 xfs_mount_t *mp; /* mount point structure */
2892 __be64 *pp; /* ptr to block address */
2893 struct xfs_btree_block *rblock;/* root btree block */
2894
2895 mp = ip->i_mount;
2896 ifp = XFS_IFORK_PTR(ip, whichfork);
2897 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
2898 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
2899 rblock = ifp->if_broot;
2900 ASSERT(be16_to_cpu(rblock->bb_level) == 1);
2901 ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
2902 ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1);
2903 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes);
2904 cbno = be64_to_cpu(*pp);
2905 *logflagsp = 0;
2906 #ifdef DEBUG
2907 if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
2908 return error;
2909 #endif
2910 if ((error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp,
2911 XFS_BMAP_BTREE_REF)))
2912 return error;
2913 cblock = XFS_BUF_TO_BLOCK(cbp);
2914 if ((error = xfs_btree_check_block(cur, cblock, 0, cbp)))
2915 return error;
2916 xfs_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
2917 ip->i_d.di_nblocks--;
2918 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
2919 xfs_trans_binval(tp, cbp);
2920 if (cur->bc_bufs[0] == cbp)
2921 cur->bc_bufs[0] = NULL;
2922 xfs_iroot_realloc(ip, -1, whichfork);
2923 ASSERT(ifp->if_broot == NULL);
2924 ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
2925 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
2926 *logflagsp = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
2927 return 0;
2928 }
2929
2930 /*
2931 * Called by xfs_bmapi to update file extent records and the btree
2932 * after removing space (or undoing a delayed allocation).
2933 */
2934 STATIC int /* error */
2935 xfs_bmap_del_extent(
2936 xfs_inode_t *ip, /* incore inode pointer */
2937 xfs_trans_t *tp, /* current transaction pointer */
2938 xfs_extnum_t idx, /* extent number to update/delete */
2939 xfs_bmap_free_t *flist, /* list of extents to be freed */
2940 xfs_btree_cur_t *cur, /* if null, not a btree */
2941 xfs_bmbt_irec_t *del, /* data to remove from extents */
2942 int *logflagsp, /* inode logging flags */
2943 xfs_extdelta_t *delta, /* Change made to incore extents */
2944 int whichfork, /* data or attr fork */
2945 int rsvd) /* OK to allocate reserved blocks */
2946 {
2947 xfs_filblks_t da_new; /* new delay-alloc indirect blocks */
2948 xfs_filblks_t da_old; /* old delay-alloc indirect blocks */
2949 xfs_fsblock_t del_endblock=0; /* first block past del */
2950 xfs_fileoff_t del_endoff; /* first offset past del */
2951 int delay; /* current block is delayed allocated */
2952 int do_fx; /* free extent at end of routine */
2953 xfs_bmbt_rec_host_t *ep; /* current extent entry pointer */
2954 int error; /* error return value */
2955 int flags; /* inode logging flags */
2956 xfs_bmbt_irec_t got; /* current extent entry */
2957 xfs_fileoff_t got_endoff; /* first offset past got */
2958 int i; /* temp state */
2959 xfs_ifork_t *ifp; /* inode fork pointer */
2960 xfs_mount_t *mp; /* mount structure */
2961 xfs_filblks_t nblks; /* quota/sb block count */
2962 xfs_bmbt_irec_t new; /* new record to be inserted */
2963 /* REFERENCED */
2964 uint qfield; /* quota field to update */
2965 xfs_filblks_t temp; /* for indirect length calculations */
2966 xfs_filblks_t temp2; /* for indirect length calculations */
2967 int state = 0;
2968
2969 XFS_STATS_INC(xs_del_exlist);
2970
2971 if (whichfork == XFS_ATTR_FORK)
2972 state |= BMAP_ATTRFORK;
2973
2974 mp = ip->i_mount;
2975 ifp = XFS_IFORK_PTR(ip, whichfork);
2976 ASSERT((idx >= 0) && (idx < ifp->if_bytes /
2977 (uint)sizeof(xfs_bmbt_rec_t)));
2978 ASSERT(del->br_blockcount > 0);
2979 ep = xfs_iext_get_ext(ifp, idx);
2980 xfs_bmbt_get_all(ep, &got);
2981 ASSERT(got.br_startoff <= del->br_startoff);
2982 del_endoff = del->br_startoff + del->br_blockcount;
2983 got_endoff = got.br_startoff + got.br_blockcount;
2984 ASSERT(got_endoff >= del_endoff);
2985 delay = isnullstartblock(got.br_startblock);
2986 ASSERT(isnullstartblock(del->br_startblock) == delay);
2987 flags = 0;
2988 qfield = 0;
2989 error = 0;
2990 /*
2991 * If deleting a real allocation, must free up the disk space.
2992 */
2993 if (!delay) {
2994 flags = XFS_ILOG_CORE;
2995 /*
2996 * Realtime allocation. Free it and record di_nblocks update.
2997 */
2998 if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
2999 xfs_fsblock_t bno;
3000 xfs_filblks_t len;
3001
3002 ASSERT(do_mod(del->br_blockcount,
3003 mp->m_sb.sb_rextsize) == 0);
3004 ASSERT(do_mod(del->br_startblock,
3005 mp->m_sb.sb_rextsize) == 0);
3006 bno = del->br_startblock;
3007 len = del->br_blockcount;
3008 do_div(bno, mp->m_sb.sb_rextsize);
3009 do_div(len, mp->m_sb.sb_rextsize);
3010 if ((error = xfs_rtfree_extent(ip->i_transp, bno,
3011 (xfs_extlen_t)len)))
3012 goto done;
3013 do_fx = 0;
3014 nblks = len * mp->m_sb.sb_rextsize;
3015 qfield = XFS_TRANS_DQ_RTBCOUNT;
3016 }
3017 /*
3018 * Ordinary allocation.
3019 */
3020 else {
3021 do_fx = 1;
3022 nblks = del->br_blockcount;
3023 qfield = XFS_TRANS_DQ_BCOUNT;
3024 }
3025 /*
3026 * Set up del_endblock and cur for later.
3027 */
3028 del_endblock = del->br_startblock + del->br_blockcount;
3029 if (cur) {
3030 if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
3031 got.br_startblock, got.br_blockcount,
3032 &i)))
3033 goto done;
3034 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
3035 }
3036 da_old = da_new = 0;
3037 } else {
3038 da_old = startblockval(got.br_startblock);
3039 da_new = 0;
3040 nblks = 0;
3041 do_fx = 0;
3042 }
3043 /*
3044 * Set flag value to use in switch statement.
3045 * Left-contig is 2, right-contig is 1.
3046 */
3047 switch (((got.br_startoff == del->br_startoff) << 1) |
3048 (got_endoff == del_endoff)) {
3049 case 3:
3050 /*
3051 * Matches the whole extent. Delete the entry.
3052 */
3053 xfs_iext_remove(ip, idx, 1,
3054 whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0);
3055 ifp->if_lastex = idx;
3056 if (delay)
3057 break;
3058 XFS_IFORK_NEXT_SET(ip, whichfork,
3059 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
3060 flags |= XFS_ILOG_CORE;
3061 if (!cur) {
3062 flags |= xfs_ilog_fext(whichfork);
3063 break;
3064 }
3065 if ((error = xfs_btree_delete(cur, &i)))
3066 goto done;
3067 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
3068 break;
3069
3070 case 2:
3071 /*
3072 * Deleting the first part of the extent.
3073 */
3074 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
3075 xfs_bmbt_set_startoff(ep, del_endoff);
3076 temp = got.br_blockcount - del->br_blockcount;
3077 xfs_bmbt_set_blockcount(ep, temp);
3078 ifp->if_lastex = idx;
3079 if (delay) {
3080 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
3081 da_old);
3082 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
3083 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
3084 da_new = temp;
3085 break;
3086 }
3087 xfs_bmbt_set_startblock(ep, del_endblock);
3088 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
3089 if (!cur) {
3090 flags |= xfs_ilog_fext(whichfork);
3091 break;
3092 }
3093 if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
3094 got.br_blockcount - del->br_blockcount,
3095 got.br_state)))
3096 goto done;
3097 break;
3098
3099 case 1:
3100 /*
3101 * Deleting the last part of the extent.
3102 */
3103 temp = got.br_blockcount - del->br_blockcount;
3104 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
3105 xfs_bmbt_set_blockcount(ep, temp);
3106 ifp->if_lastex = idx;
3107 if (delay) {
3108 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
3109 da_old);
3110 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
3111 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
3112 da_new = temp;
3113 break;
3114 }
3115 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
3116 if (!cur) {
3117 flags |= xfs_ilog_fext(whichfork);
3118 break;
3119 }
3120 if ((error = xfs_bmbt_update(cur, got.br_startoff,
3121 got.br_startblock,
3122 got.br_blockcount - del->br_blockcount,
3123 got.br_state)))
3124 goto done;
3125 break;
3126
3127 case 0:
3128 /*
3129 * Deleting the middle of the extent.
3130 */
3131 temp = del->br_startoff - got.br_startoff;
3132 trace_xfs_bmap_pre_update(ip, idx, state, _THIS_IP_);
3133 xfs_bmbt_set_blockcount(ep, temp);
3134 new.br_startoff = del_endoff;
3135 temp2 = got_endoff - del_endoff;
3136 new.br_blockcount = temp2;
3137 new.br_state = got.br_state;
3138 if (!delay) {
3139 new.br_startblock = del_endblock;
3140 flags |= XFS_ILOG_CORE;
3141 if (cur) {
3142 if ((error = xfs_bmbt_update(cur,
3143 got.br_startoff,
3144 got.br_startblock, temp,
3145 got.br_state)))
3146 goto done;
3147 if ((error = xfs_btree_increment(cur, 0, &i)))
3148 goto done;
3149 cur->bc_rec.b = new;
3150 error = xfs_btree_insert(cur, &i);
3151 if (error && error != ENOSPC)
3152 goto done;
3153 /*
3154 * If get no-space back from btree insert,
3155 * it tried a split, and we have a zero
3156 * block reservation.
3157 * Fix up our state and return the error.
3158 */
3159 if (error == ENOSPC) {
3160 /*
3161 * Reset the cursor, don't trust
3162 * it after any insert operation.
3163 */
3164 if ((error = xfs_bmbt_lookup_eq(cur,
3165 got.br_startoff,
3166 got.br_startblock,
3167 temp, &i)))
3168 goto done;
3169 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
3170 /*
3171 * Update the btree record back
3172 * to the original value.
3173 */
3174 if ((error = xfs_bmbt_update(cur,
3175 got.br_startoff,
3176 got.br_startblock,
3177 got.br_blockcount,
3178 got.br_state)))
3179 goto done;
3180 /*
3181 * Reset the extent record back
3182 * to the original value.
3183 */
3184 xfs_bmbt_set_blockcount(ep,
3185 got.br_blockcount);
3186 flags = 0;
3187 error = XFS_ERROR(ENOSPC);
3188 goto done;
3189 }
3190 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
3191 } else
3192 flags |= xfs_ilog_fext(whichfork);
3193 XFS_IFORK_NEXT_SET(ip, whichfork,
3194 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
3195 } else {
3196 ASSERT(whichfork == XFS_DATA_FORK);
3197 temp = xfs_bmap_worst_indlen(ip, temp);
3198 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
3199 temp2 = xfs_bmap_worst_indlen(ip, temp2);
3200 new.br_startblock = nullstartblock((int)temp2);
3201 da_new = temp + temp2;
3202 while (da_new > da_old) {
3203 if (temp) {
3204 temp--;
3205 da_new--;
3206 xfs_bmbt_set_startblock(ep,
3207 nullstartblock((int)temp));
3208 }
3209 if (da_new == da_old)
3210 break;
3211 if (temp2) {
3212 temp2--;
3213 da_new--;
3214 new.br_startblock =
3215 nullstartblock((int)temp2);
3216 }
3217 }
3218 }
3219 trace_xfs_bmap_post_update(ip, idx, state, _THIS_IP_);
3220 xfs_iext_insert(ip, idx + 1, 1, &new, state);
3221 ifp->if_lastex = idx + 1;
3222 break;
3223 }
3224 /*
3225 * If we need to, add to list of extents to delete.
3226 */
3227 if (do_fx)
3228 xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
3229 mp);
3230 /*
3231 * Adjust inode # blocks in the file.
3232 */
3233 if (nblks)
3234 ip->i_d.di_nblocks -= nblks;
3235 /*
3236 * Adjust quota data.
3237 */
3238 if (qfield)
3239 xfs_trans_mod_dquot_byino(tp, ip, qfield, (long)-nblks);
3240
3241 /*
3242 * Account for change in delayed indirect blocks.
3243 * Nothing to do for disk quota accounting here.
3244 */
3245 ASSERT(da_old >= da_new);
3246 if (da_old > da_new)
3247 xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, (int64_t)(da_old - da_new),
3248 rsvd);
3249 if (delta) {
3250 /* DELTA: report the original extent. */
3251 if (delta->xed_startoff > got.br_startoff)
3252 delta->xed_startoff = got.br_startoff;
3253 if (delta->xed_blockcount < got.br_startoff+got.br_blockcount)
3254 delta->xed_blockcount = got.br_startoff +
3255 got.br_blockcount;
3256 }
3257 done:
3258 *logflagsp = flags;
3259 return error;
3260 }
3261
3262 /*
3263 * Remove the entry "free" from the free item list. Prev points to the
3264 * previous entry, unless "free" is the head of the list.
3265 */
3266 STATIC void
3267 xfs_bmap_del_free(
3268 xfs_bmap_free_t *flist, /* free item list header */
3269 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
3270 xfs_bmap_free_item_t *free) /* list item to be freed */
3271 {
3272 if (prev)
3273 prev->xbfi_next = free->xbfi_next;
3274 else
3275 flist->xbf_first = free->xbfi_next;
3276 flist->xbf_count--;
3277 kmem_zone_free(xfs_bmap_free_item_zone, free);
3278 }
3279
3280 /*
3281 * Convert an extents-format file into a btree-format file.
3282 * The new file will have a root block (in the inode) and a single child block.
3283 */
3284 STATIC int /* error */
3285 xfs_bmap_extents_to_btree(
3286 xfs_trans_t *tp, /* transaction pointer */
3287 xfs_inode_t *ip, /* incore inode pointer */
3288 xfs_fsblock_t *firstblock, /* first-block-allocated */
3289 xfs_bmap_free_t *flist, /* blocks freed in xaction */
3290 xfs_btree_cur_t **curp, /* cursor returned to caller */
3291 int wasdel, /* converting a delayed alloc */
3292 int *logflagsp, /* inode logging flags */
3293 int whichfork) /* data or attr fork */
3294 {
3295 struct xfs_btree_block *ablock; /* allocated (child) bt block */
3296 xfs_buf_t *abp; /* buffer for ablock */
3297 xfs_alloc_arg_t args; /* allocation arguments */
3298 xfs_bmbt_rec_t *arp; /* child record pointer */
3299 struct xfs_btree_block *block; /* btree root block */
3300 xfs_btree_cur_t *cur; /* bmap btree cursor */
3301 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3302 int error; /* error return value */
3303 xfs_extnum_t i, cnt; /* extent record index */
3304 xfs_ifork_t *ifp; /* inode fork pointer */
3305 xfs_bmbt_key_t *kp; /* root block key pointer */
3306 xfs_mount_t *mp; /* mount structure */
3307 xfs_extnum_t nextents; /* number of file extents */
3308 xfs_bmbt_ptr_t *pp; /* root block address pointer */
3309
3310 ifp = XFS_IFORK_PTR(ip, whichfork);
3311 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
3312 ASSERT(ifp->if_ext_max ==
3313 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
3314 /*
3315 * Make space in the inode incore.
3316 */
3317 xfs_iroot_realloc(ip, 1, whichfork);
3318 ifp->if_flags |= XFS_IFBROOT;
3319
3320 /*
3321 * Fill in the root.
3322 */
3323 block = ifp->if_broot;
3324 block->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3325 block->bb_level = cpu_to_be16(1);
3326 block->bb_numrecs = cpu_to_be16(1);
3327 block->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
3328 block->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
3329
3330 /*
3331 * Need a cursor. Can't allocate until bb_level is filled in.
3332 */
3333 mp = ip->i_mount;
3334 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
3335 cur->bc_private.b.firstblock = *firstblock;
3336 cur->bc_private.b.flist = flist;
3337 cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
3338 /*
3339 * Convert to a btree with two levels, one record in root.
3340 */
3341 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
3342 args.tp = tp;
3343 args.mp = mp;
3344 args.firstblock = *firstblock;
3345 if (*firstblock == NULLFSBLOCK) {
3346 args.type = XFS_ALLOCTYPE_START_BNO;
3347 args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
3348 } else if (flist->xbf_low) {
3349 args.type = XFS_ALLOCTYPE_START_BNO;
3350 args.fsbno = *firstblock;
3351 } else {
3352 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3353 args.fsbno = *firstblock;
3354 }
3355 args.minlen = args.maxlen = args.prod = 1;
3356 args.total = args.minleft = args.alignment = args.mod = args.isfl =
3357 args.minalignslop = 0;
3358 args.wasdel = wasdel;
3359 *logflagsp = 0;
3360 if ((error = xfs_alloc_vextent(&args))) {
3361 xfs_iroot_realloc(ip, -1, whichfork);
3362 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
3363 return error;
3364 }
3365 /*
3366 * Allocation can't fail, the space was reserved.
3367 */
3368 ASSERT(args.fsbno != NULLFSBLOCK);
3369 ASSERT(*firstblock == NULLFSBLOCK ||
3370 args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) ||
3371 (flist->xbf_low &&
3372 args.agno > XFS_FSB_TO_AGNO(mp, *firstblock)));
3373 *firstblock = cur->bc_private.b.firstblock = args.fsbno;
3374 cur->bc_private.b.allocated++;
3375 ip->i_d.di_nblocks++;
3376 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
3377 abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
3378 /*
3379 * Fill in the child block.
3380 */
3381 ablock = XFS_BUF_TO_BLOCK(abp);
3382 ablock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3383 ablock->bb_level = 0;
3384 ablock->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
3385 ablock->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
3386 arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
3387 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3388 for (cnt = i = 0; i < nextents; i++) {
3389 ep = xfs_iext_get_ext(ifp, i);
3390 if (!isnullstartblock(xfs_bmbt_get_startblock(ep))) {
3391 arp->l0 = cpu_to_be64(ep->l0);
3392 arp->l1 = cpu_to_be64(ep->l1);
3393 arp++; cnt++;
3394 }
3395 }
3396 ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
3397 xfs_btree_set_numrecs(ablock, cnt);
3398
3399 /*
3400 * Fill in the root key and pointer.
3401 */
3402 kp = XFS_BMBT_KEY_ADDR(mp, block, 1);
3403 arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
3404 kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
3405 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur,
3406 be16_to_cpu(block->bb_level)));
3407 *pp = cpu_to_be64(args.fsbno);
3408
3409 /*
3410 * Do all this logging at the end so that
3411 * the root is at the right level.
3412 */
3413 xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS);
3414 xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
3415 ASSERT(*curp == NULL);
3416 *curp = cur;
3417 *logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork);
3418 return 0;
3419 }
3420
3421 /*
3422 * Calculate the default attribute fork offset for newly created inodes.
3423 */
3424 uint
3425 xfs_default_attroffset(
3426 struct xfs_inode *ip)
3427 {
3428 struct xfs_mount *mp = ip->i_mount;
3429 uint offset;
3430
3431 if (mp->m_sb.sb_inodesize == 256) {
3432 offset = XFS_LITINO(mp) -
3433 XFS_BMDR_SPACE_CALC(MINABTPTRS);
3434 } else {
3435 offset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
3436 }
3437
3438 ASSERT(offset < XFS_LITINO(mp));
3439 return offset;
3440 }
3441
3442 /*
3443 * Helper routine to reset inode di_forkoff field when switching
3444 * attribute fork from local to extent format - we reset it where
3445 * possible to make space available for inline data fork extents.
3446 */
3447 STATIC void
3448 xfs_bmap_forkoff_reset(
3449 xfs_mount_t *mp,
3450 xfs_inode_t *ip,
3451 int whichfork)
3452 {
3453 if (whichfork == XFS_ATTR_FORK &&
3454 ip->i_d.di_format != XFS_DINODE_FMT_DEV &&
3455 ip->i_d.di_format != XFS_DINODE_FMT_UUID &&
3456 ip->i_d.di_format != XFS_DINODE_FMT_BTREE) {
3457 uint dfl_forkoff = xfs_default_attroffset(ip) >> 3;
3458
3459 if (dfl_forkoff > ip->i_d.di_forkoff) {
3460 ip->i_d.di_forkoff = dfl_forkoff;
3461 ip->i_df.if_ext_max =
3462 XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t);
3463 ip->i_afp->if_ext_max =
3464 XFS_IFORK_ASIZE(ip) / sizeof(xfs_bmbt_rec_t);
3465 }
3466 }
3467 }
3468
3469 /*
3470 * Convert a local file to an extents file.
3471 * This code is out of bounds for data forks of regular files,
3472 * since the file data needs to get logged so things will stay consistent.
3473 * (The bmap-level manipulations are ok, though).
3474 */
3475 STATIC int /* error */
3476 xfs_bmap_local_to_extents(
3477 xfs_trans_t *tp, /* transaction pointer */
3478 xfs_inode_t *ip, /* incore inode pointer */
3479 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
3480 xfs_extlen_t total, /* total blocks needed by transaction */
3481 int *logflagsp, /* inode logging flags */
3482 int whichfork) /* data or attr fork */
3483 {
3484 int error; /* error return value */
3485 int flags; /* logging flags returned */
3486 xfs_ifork_t *ifp; /* inode fork pointer */
3487
3488 /*
3489 * We don't want to deal with the case of keeping inode data inline yet.
3490 * So sending the data fork of a regular inode is invalid.
3491 */
3492 ASSERT(!((ip->i_d.di_mode & S_IFMT) == S_IFREG &&
3493 whichfork == XFS_DATA_FORK));
3494 ifp = XFS_IFORK_PTR(ip, whichfork);
3495 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
3496 flags = 0;
3497 error = 0;
3498 if (ifp->if_bytes) {
3499 xfs_alloc_arg_t args; /* allocation arguments */
3500 xfs_buf_t *bp; /* buffer for extent block */
3501 xfs_bmbt_rec_host_t *ep;/* extent record pointer */
3502
3503 args.tp = tp;
3504 args.mp = ip->i_mount;
3505 args.firstblock = *firstblock;
3506 ASSERT((ifp->if_flags &
3507 (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) == XFS_IFINLINE);
3508 /*
3509 * Allocate a block. We know we need only one, since the
3510 * file currently fits in an inode.
3511 */
3512 if (*firstblock == NULLFSBLOCK) {
3513 args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
3514 args.type = XFS_ALLOCTYPE_START_BNO;
3515 } else {
3516 args.fsbno = *firstblock;
3517 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3518 }
3519 args.total = total;
3520 args.mod = args.minleft = args.alignment = args.wasdel =
3521 args.isfl = args.minalignslop = 0;
3522 args.minlen = args.maxlen = args.prod = 1;
3523 if ((error = xfs_alloc_vextent(&args)))
3524 goto done;
3525 /*
3526 * Can't fail, the space was reserved.
3527 */
3528 ASSERT(args.fsbno != NULLFSBLOCK);
3529 ASSERT(args.len == 1);
3530 *firstblock = args.fsbno;
3531 bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
3532 memcpy((char *)XFS_BUF_PTR(bp), ifp->if_u1.if_data,
3533 ifp->if_bytes);
3534 xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
3535 xfs_bmap_forkoff_reset(args.mp, ip, whichfork);
3536 xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
3537 xfs_iext_add(ifp, 0, 1);
3538 ep = xfs_iext_get_ext(ifp, 0);
3539 xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
3540 trace_xfs_bmap_post_update(ip, 0,
3541 whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0,
3542 _THIS_IP_);
3543 XFS_IFORK_NEXT_SET(ip, whichfork, 1);
3544 ip->i_d.di_nblocks = 1;
3545 xfs_trans_mod_dquot_byino(tp, ip,
3546 XFS_TRANS_DQ_BCOUNT, 1L);
3547 flags |= xfs_ilog_fext(whichfork);
3548 } else {
3549 ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
3550 xfs_bmap_forkoff_reset(ip->i_mount, ip, whichfork);
3551 }
3552 ifp->if_flags &= ~XFS_IFINLINE;
3553 ifp->if_flags |= XFS_IFEXTENTS;
3554 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
3555 flags |= XFS_ILOG_CORE;
3556 done:
3557 *logflagsp = flags;
3558 return error;
3559 }
3560
3561 /*
3562 * Search the extent records for the entry containing block bno.
3563 * If bno lies in a hole, point to the next entry. If bno lies
3564 * past eof, *eofp will be set, and *prevp will contain the last
3565 * entry (null if none). Else, *lastxp will be set to the index
3566 * of the found entry; *gotp will contain the entry.
3567 */
3568 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
3569 xfs_bmap_search_multi_extents(
3570 xfs_ifork_t *ifp, /* inode fork pointer */
3571 xfs_fileoff_t bno, /* block number searched for */
3572 int *eofp, /* out: end of file found */
3573 xfs_extnum_t *lastxp, /* out: last extent index */
3574 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3575 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3576 {
3577 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3578 xfs_extnum_t lastx; /* last extent index */
3579
3580 /*
3581 * Initialize the extent entry structure to catch access to
3582 * uninitialized br_startblock field.
3583 */
3584 gotp->br_startoff = 0xffa5a5a5a5a5a5a5LL;
3585 gotp->br_blockcount = 0xa55a5a5a5a5a5a5aLL;
3586 gotp->br_state = XFS_EXT_INVALID;
3587 #if XFS_BIG_BLKNOS
3588 gotp->br_startblock = 0xffffa5a5a5a5a5a5LL;
3589 #else
3590 gotp->br_startblock = 0xffffa5a5;
3591 #endif
3592 prevp->br_startoff = NULLFILEOFF;
3593
3594 ep = xfs_iext_bno_to_ext(ifp, bno, &lastx);
3595 if (lastx > 0) {
3596 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx - 1), prevp);
3597 }
3598 if (lastx < (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
3599 xfs_bmbt_get_all(ep, gotp);
3600 *eofp = 0;
3601 } else {
3602 if (lastx > 0) {
3603 *gotp = *prevp;
3604 }
3605 *eofp = 1;
3606 ep = NULL;
3607 }
3608 *lastxp = lastx;
3609 return ep;
3610 }
3611
3612 /*
3613 * Search the extents list for the inode, for the extent containing bno.
3614 * If bno lies in a hole, point to the next entry. If bno lies past eof,
3615 * *eofp will be set, and *prevp will contain the last entry (null if none).
3616 * Else, *lastxp will be set to the index of the found
3617 * entry; *gotp will contain the entry.
3618 */
3619 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
3620 xfs_bmap_search_extents(
3621 xfs_inode_t *ip, /* incore inode pointer */
3622 xfs_fileoff_t bno, /* block number searched for */
3623 int fork, /* data or attr fork */
3624 int *eofp, /* out: end of file found */
3625 xfs_extnum_t *lastxp, /* out: last extent index */
3626 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3627 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3628 {
3629 xfs_ifork_t *ifp; /* inode fork pointer */
3630 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3631
3632 XFS_STATS_INC(xs_look_exlist);
3633 ifp = XFS_IFORK_PTR(ip, fork);
3634
3635 ep = xfs_bmap_search_multi_extents(ifp, bno, eofp, lastxp, gotp, prevp);
3636
3637 if (unlikely(!(gotp->br_startblock) && (*lastxp != NULLEXTNUM) &&
3638 !(XFS_IS_REALTIME_INODE(ip) && fork == XFS_DATA_FORK))) {
3639 xfs_cmn_err(XFS_PTAG_FSBLOCK_ZERO, CE_ALERT, ip->i_mount,
3640 "Access to block zero in inode %llu "
3641 "start_block: %llx start_off: %llx "
3642 "blkcnt: %llx extent-state: %x lastx: %x\n",
3643 (unsigned long long)ip->i_ino,
3644 (unsigned long long)gotp->br_startblock,
3645 (unsigned long long)gotp->br_startoff,
3646 (unsigned long long)gotp->br_blockcount,
3647 gotp->br_state, *lastxp);
3648 *lastxp = NULLEXTNUM;
3649 *eofp = 1;
3650 return NULL;
3651 }
3652 return ep;
3653 }
3654
3655 /*
3656 * Compute the worst-case number of indirect blocks that will be used
3657 * for ip's delayed extent of length "len".
3658 */
3659 STATIC xfs_filblks_t
3660 xfs_bmap_worst_indlen(
3661 xfs_inode_t *ip, /* incore inode pointer */
3662 xfs_filblks_t len) /* delayed extent length */
3663 {
3664 int level; /* btree level number */
3665 int maxrecs; /* maximum record count at this level */
3666 xfs_mount_t *mp; /* mount structure */
3667 xfs_filblks_t rval; /* return value */
3668
3669 mp = ip->i_mount;
3670 maxrecs = mp->m_bmap_dmxr[0];
3671 for (level = 0, rval = 0;
3672 level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
3673 level++) {
3674 len += maxrecs - 1;
3675 do_div(len, maxrecs);
3676 rval += len;
3677 if (len == 1)
3678 return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
3679 level - 1;
3680 if (level == 0)
3681 maxrecs = mp->m_bmap_dmxr[1];
3682 }
3683 return rval;
3684 }
3685
3686 /*
3687 * Convert inode from non-attributed to attributed.
3688 * Must not be in a transaction, ip must not be locked.
3689 */
3690 int /* error code */
3691 xfs_bmap_add_attrfork(
3692 xfs_inode_t *ip, /* incore inode pointer */
3693 int size, /* space new attribute needs */
3694 int rsvd) /* xact may use reserved blks */
3695 {
3696 xfs_fsblock_t firstblock; /* 1st block/ag allocated */
3697 xfs_bmap_free_t flist; /* freed extent records */
3698 xfs_mount_t *mp; /* mount structure */
3699 xfs_trans_t *tp; /* transaction pointer */
3700 int blks; /* space reservation */
3701 int version = 1; /* superblock attr version */
3702 int committed; /* xaction was committed */
3703 int logflags; /* logging flags */
3704 int error; /* error return value */
3705
3706 ASSERT(XFS_IFORK_Q(ip) == 0);
3707 ASSERT(ip->i_df.if_ext_max ==
3708 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3709
3710 mp = ip->i_mount;
3711 ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
3712 tp = xfs_trans_alloc(mp, XFS_TRANS_ADDAFORK);
3713 blks = XFS_ADDAFORK_SPACE_RES(mp);
3714 if (rsvd)
3715 tp->t_flags |= XFS_TRANS_RESERVE;
3716 if ((error = xfs_trans_reserve(tp, blks, XFS_ADDAFORK_LOG_RES(mp), 0,
3717 XFS_TRANS_PERM_LOG_RES, XFS_ADDAFORK_LOG_COUNT)))
3718 goto error0;
3719 xfs_ilock(ip, XFS_ILOCK_EXCL);
3720 error = xfs_trans_reserve_quota_nblks(tp, ip, blks, 0, rsvd ?
3721 XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
3722 XFS_QMOPT_RES_REGBLKS);
3723 if (error) {
3724 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3725 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
3726 return error;
3727 }
3728 if (XFS_IFORK_Q(ip))
3729 goto error1;
3730 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
3731 /*
3732 * For inodes coming from pre-6.2 filesystems.
3733 */
3734 ASSERT(ip->i_d.di_aformat == 0);
3735 ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
3736 }
3737 ASSERT(ip->i_d.di_anextents == 0);
3738 IHOLD(ip);
3739 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
3740 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
3741 switch (ip->i_d.di_format) {
3742 case XFS_DINODE_FMT_DEV:
3743 ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
3744 break;
3745 case XFS_DINODE_FMT_UUID:
3746 ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
3747 break;
3748 case XFS_DINODE_FMT_LOCAL:
3749 case XFS_DINODE_FMT_EXTENTS:
3750 case XFS_DINODE_FMT_BTREE:
3751 ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
3752 if (!ip->i_d.di_forkoff)
3753 ip->i_d.di_forkoff = xfs_default_attroffset(ip) >> 3;
3754 else if (mp->m_flags & XFS_MOUNT_ATTR2)
3755 version = 2;
3756 break;
3757 default:
3758 ASSERT(0);
3759 error = XFS_ERROR(EINVAL);
3760 goto error1;
3761 }
3762 ip->i_df.if_ext_max =
3763 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
3764 ASSERT(ip->i_afp == NULL);
3765 ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
3766 ip->i_afp->if_ext_max =
3767 XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
3768 ip->i_afp->if_flags = XFS_IFEXTENTS;
3769 logflags = 0;
3770 xfs_bmap_init(&flist, &firstblock);
3771 switch (ip->i_d.di_format) {
3772 case XFS_DINODE_FMT_LOCAL:
3773 error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &flist,
3774 &logflags);
3775 break;
3776 case XFS_DINODE_FMT_EXTENTS:
3777 error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
3778 &flist, &logflags);
3779 break;
3780 case XFS_DINODE_FMT_BTREE:
3781 error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &flist,
3782 &logflags);
3783 break;
3784 default:
3785 error = 0;
3786 break;
3787 }
3788 if (logflags)
3789 xfs_trans_log_inode(tp, ip, logflags);
3790 if (error)
3791 goto error2;
3792 if (!xfs_sb_version_hasattr(&mp->m_sb) ||
3793 (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2)) {
3794 __int64_t sbfields = 0;
3795
3796 spin_lock(&mp->m_sb_lock);
3797 if (!xfs_sb_version_hasattr(&mp->m_sb)) {
3798 xfs_sb_version_addattr(&mp->m_sb);
3799 sbfields |= XFS_SB_VERSIONNUM;
3800 }
3801 if (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2) {
3802 xfs_sb_version_addattr2(&mp->m_sb);
3803 sbfields |= (XFS_SB_VERSIONNUM | XFS_SB_FEATURES2);
3804 }
3805 if (sbfields) {
3806 spin_unlock(&mp->m_sb_lock);
3807 xfs_mod_sb(tp, sbfields);
3808 } else
3809 spin_unlock(&mp->m_sb_lock);
3810 }
3811 if ((error = xfs_bmap_finish(&tp, &flist, &committed)))
3812 goto error2;
3813 error = xfs_trans_commit(tp, XFS_TRANS_PERM_LOG_RES);
3814 ASSERT(ip->i_df.if_ext_max ==
3815 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3816 return error;
3817 error2:
3818 xfs_bmap_cancel(&flist);
3819 error1:
3820 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3821 error0:
3822 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
3823 ASSERT(ip->i_df.if_ext_max ==
3824 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3825 return error;
3826 }
3827
3828 /*
3829 * Add the extent to the list of extents to be free at transaction end.
3830 * The list is maintained sorted (by block number).
3831 */
3832 /* ARGSUSED */
3833 void
3834 xfs_bmap_add_free(
3835 xfs_fsblock_t bno, /* fs block number of extent */
3836 xfs_filblks_t len, /* length of extent */
3837 xfs_bmap_free_t *flist, /* list of extents */
3838 xfs_mount_t *mp) /* mount point structure */
3839 {
3840 xfs_bmap_free_item_t *cur; /* current (next) element */
3841 xfs_bmap_free_item_t *new; /* new element */
3842 xfs_bmap_free_item_t *prev; /* previous element */
3843 #ifdef DEBUG
3844 xfs_agnumber_t agno;
3845 xfs_agblock_t agbno;
3846
3847 ASSERT(bno != NULLFSBLOCK);
3848 ASSERT(len > 0);
3849 ASSERT(len <= MAXEXTLEN);
3850 ASSERT(!isnullstartblock(bno));
3851 agno = XFS_FSB_TO_AGNO(mp, bno);
3852 agbno = XFS_FSB_TO_AGBNO(mp, bno);
3853 ASSERT(agno < mp->m_sb.sb_agcount);
3854 ASSERT(agbno < mp->m_sb.sb_agblocks);
3855 ASSERT(len < mp->m_sb.sb_agblocks);
3856 ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
3857 #endif
3858 ASSERT(xfs_bmap_free_item_zone != NULL);
3859 new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
3860 new->xbfi_startblock = bno;
3861 new->xbfi_blockcount = (xfs_extlen_t)len;
3862 for (prev = NULL, cur = flist->xbf_first;
3863 cur != NULL;
3864 prev = cur, cur = cur->xbfi_next) {
3865 if (cur->xbfi_startblock >= bno)
3866 break;
3867 }
3868 if (prev)
3869 prev->xbfi_next = new;
3870 else
3871 flist->xbf_first = new;
3872 new->xbfi_next = cur;
3873 flist->xbf_count++;
3874 }
3875
3876 /*
3877 * Compute and fill in the value of the maximum depth of a bmap btree
3878 * in this filesystem. Done once, during mount.
3879 */
3880 void
3881 xfs_bmap_compute_maxlevels(
3882 xfs_mount_t *mp, /* file system mount structure */
3883 int whichfork) /* data or attr fork */
3884 {
3885 int level; /* btree level */
3886 uint maxblocks; /* max blocks at this level */
3887 uint maxleafents; /* max leaf entries possible */
3888 int maxrootrecs; /* max records in root block */
3889 int minleafrecs; /* min records in leaf block */
3890 int minnoderecs; /* min records in node block */
3891 int sz; /* root block size */
3892
3893 /*
3894 * The maximum number of extents in a file, hence the maximum
3895 * number of leaf entries, is controlled by the type of di_nextents
3896 * (a signed 32-bit number, xfs_extnum_t), or by di_anextents
3897 * (a signed 16-bit number, xfs_aextnum_t).
3898 *
3899 * Note that we can no longer assume that if we are in ATTR1 that
3900 * the fork offset of all the inodes will be
3901 * (xfs_default_attroffset(ip) >> 3) because we could have mounted
3902 * with ATTR2 and then mounted back with ATTR1, keeping the
3903 * di_forkoff's fixed but probably at various positions. Therefore,
3904 * for both ATTR1 and ATTR2 we have to assume the worst case scenario
3905 * of a minimum size available.
3906 */
3907 if (whichfork == XFS_DATA_FORK) {
3908 maxleafents = MAXEXTNUM;
3909 sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
3910 } else {
3911 maxleafents = MAXAEXTNUM;
3912 sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
3913 }
3914 maxrootrecs = xfs_bmdr_maxrecs(mp, sz, 0);
3915 minleafrecs = mp->m_bmap_dmnr[0];
3916 minnoderecs = mp->m_bmap_dmnr[1];
3917 maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
3918 for (level = 1; maxblocks > 1; level++) {
3919 if (maxblocks <= maxrootrecs)
3920 maxblocks = 1;
3921 else
3922 maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
3923 }
3924 mp->m_bm_maxlevels[whichfork] = level;
3925 }
3926
3927 /*
3928 * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
3929 * caller. Frees all the extents that need freeing, which must be done
3930 * last due to locking considerations. We never free any extents in
3931 * the first transaction. This is to allow the caller to make the first
3932 * transaction a synchronous one so that the pointers to the data being
3933 * broken in this transaction will be permanent before the data is actually
3934 * freed. This is necessary to prevent blocks from being reallocated
3935 * and written to before the free and reallocation are actually permanent.
3936 * We do not just make the first transaction synchronous here, because
3937 * there are more efficient ways to gain the same protection in some cases
3938 * (see the file truncation code).
3939 *
3940 * Return 1 if the given transaction was committed and a new one
3941 * started, and 0 otherwise in the committed parameter.
3942 */
3943 /*ARGSUSED*/
3944 int /* error */
3945 xfs_bmap_finish(
3946 xfs_trans_t **tp, /* transaction pointer addr */
3947 xfs_bmap_free_t *flist, /* i/o: list extents to free */
3948 int *committed) /* xact committed or not */
3949 {
3950 xfs_efd_log_item_t *efd; /* extent free data */
3951 xfs_efi_log_item_t *efi; /* extent free intention */
3952 int error; /* error return value */
3953 xfs_bmap_free_item_t *free; /* free extent item */
3954 unsigned int logres; /* new log reservation */
3955 unsigned int logcount; /* new log count */
3956 xfs_mount_t *mp; /* filesystem mount structure */
3957 xfs_bmap_free_item_t *next; /* next item on free list */
3958 xfs_trans_t *ntp; /* new transaction pointer */
3959
3960 ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
3961 if (flist->xbf_count == 0) {
3962 *committed = 0;
3963 return 0;
3964 }
3965 ntp = *tp;
3966 efi = xfs_trans_get_efi(ntp, flist->xbf_count);
3967 for (free = flist->xbf_first; free; free = free->xbfi_next)
3968 xfs_trans_log_efi_extent(ntp, efi, free->xbfi_startblock,
3969 free->xbfi_blockcount);
3970 logres = ntp->t_log_res;
3971 logcount = ntp->t_log_count;
3972 ntp = xfs_trans_dup(*tp);
3973 error = xfs_trans_commit(*tp, 0);
3974 *tp = ntp;
3975 *committed = 1;
3976 /*
3977 * We have a new transaction, so we should return committed=1,
3978 * even though we're returning an error.
3979 */
3980 if (error)
3981 return error;
3982
3983 /*
3984 * transaction commit worked ok so we can drop the extra ticket
3985 * reference that we gained in xfs_trans_dup()
3986 */
3987 xfs_log_ticket_put(ntp->t_ticket);
3988
3989 if ((error = xfs_trans_reserve(ntp, 0, logres, 0, XFS_TRANS_PERM_LOG_RES,
3990 logcount)))
3991 return error;
3992 efd = xfs_trans_get_efd(ntp, efi, flist->xbf_count);
3993 for (free = flist->xbf_first; free != NULL; free = next) {
3994 next = free->xbfi_next;
3995 if ((error = xfs_free_extent(ntp, free->xbfi_startblock,
3996 free->xbfi_blockcount))) {
3997 /*
3998 * The bmap free list will be cleaned up at a
3999 * higher level. The EFI will be canceled when
4000 * this transaction is aborted.
4001 * Need to force shutdown here to make sure it
4002 * happens, since this transaction may not be
4003 * dirty yet.
4004 */
4005 mp = ntp->t_mountp;
4006 if (!XFS_FORCED_SHUTDOWN(mp))
4007 xfs_force_shutdown(mp,
4008 (error == EFSCORRUPTED) ?
4009 SHUTDOWN_CORRUPT_INCORE :
4010 SHUTDOWN_META_IO_ERROR);
4011 return error;
4012 }
4013 xfs_trans_log_efd_extent(ntp, efd, free->xbfi_startblock,
4014 free->xbfi_blockcount);
4015 xfs_bmap_del_free(flist, NULL, free);
4016 }
4017 return 0;
4018 }
4019
4020 /*
4021 * Free up any items left in the list.
4022 */
4023 void
4024 xfs_bmap_cancel(
4025 xfs_bmap_free_t *flist) /* list of bmap_free_items */
4026 {
4027 xfs_bmap_free_item_t *free; /* free list item */
4028 xfs_bmap_free_item_t *next;
4029
4030 if (flist->xbf_count == 0)
4031 return;
4032 ASSERT(flist->xbf_first != NULL);
4033 for (free = flist->xbf_first; free; free = next) {
4034 next = free->xbfi_next;
4035 xfs_bmap_del_free(flist, NULL, free);
4036 }
4037 ASSERT(flist->xbf_count == 0);
4038 }
4039
4040 /*
4041 * Returns the file-relative block number of the first unused block(s)
4042 * in the file with at least "len" logically contiguous blocks free.
4043 * This is the lowest-address hole if the file has holes, else the first block
4044 * past the end of file.
4045 * Return 0 if the file is currently local (in-inode).
4046 */
4047 int /* error */
4048 xfs_bmap_first_unused(
4049 xfs_trans_t *tp, /* transaction pointer */
4050 xfs_inode_t *ip, /* incore inode */
4051 xfs_extlen_t len, /* size of hole to find */
4052 xfs_fileoff_t *first_unused, /* unused block */
4053 int whichfork) /* data or attr fork */
4054 {
4055 int error; /* error return value */
4056 int idx; /* extent record index */
4057 xfs_ifork_t *ifp; /* inode fork pointer */
4058 xfs_fileoff_t lastaddr; /* last block number seen */
4059 xfs_fileoff_t lowest; /* lowest useful block */
4060 xfs_fileoff_t max; /* starting useful block */
4061 xfs_fileoff_t off; /* offset for this block */
4062 xfs_extnum_t nextents; /* number of extent entries */
4063
4064 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
4065 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
4066 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
4067 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4068 *first_unused = 0;
4069 return 0;
4070 }
4071 ifp = XFS_IFORK_PTR(ip, whichfork);
4072 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4073 (error = xfs_iread_extents(tp, ip, whichfork)))
4074 return error;
4075 lowest = *first_unused;
4076 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4077 for (idx = 0, lastaddr = 0, max = lowest; idx < nextents; idx++) {
4078 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
4079 off = xfs_bmbt_get_startoff(ep);
4080 /*
4081 * See if the hole before this extent will work.
4082 */
4083 if (off >= lowest + len && off - max >= len) {
4084 *first_unused = max;
4085 return 0;
4086 }
4087 lastaddr = off + xfs_bmbt_get_blockcount(ep);
4088 max = XFS_FILEOFF_MAX(lastaddr, lowest);
4089 }
4090 *first_unused = max;
4091 return 0;
4092 }
4093
4094 /*
4095 * Returns the file-relative block number of the last block + 1 before
4096 * last_block (input value) in the file.
4097 * This is not based on i_size, it is based on the extent records.
4098 * Returns 0 for local files, as they do not have extent records.
4099 */
4100 int /* error */
4101 xfs_bmap_last_before(
4102 xfs_trans_t *tp, /* transaction pointer */
4103 xfs_inode_t *ip, /* incore inode */
4104 xfs_fileoff_t *last_block, /* last block */
4105 int whichfork) /* data or attr fork */
4106 {
4107 xfs_fileoff_t bno; /* input file offset */
4108 int eof; /* hit end of file */
4109 xfs_bmbt_rec_host_t *ep; /* pointer to last extent */
4110 int error; /* error return value */
4111 xfs_bmbt_irec_t got; /* current extent value */
4112 xfs_ifork_t *ifp; /* inode fork pointer */
4113 xfs_extnum_t lastx; /* last extent used */
4114 xfs_bmbt_irec_t prev; /* previous extent value */
4115
4116 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4117 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4118 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
4119 return XFS_ERROR(EIO);
4120 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4121 *last_block = 0;
4122 return 0;
4123 }
4124 ifp = XFS_IFORK_PTR(ip, whichfork);
4125 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4126 (error = xfs_iread_extents(tp, ip, whichfork)))
4127 return error;
4128 bno = *last_block - 1;
4129 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
4130 &prev);
4131 if (eof || xfs_bmbt_get_startoff(ep) > bno) {
4132 if (prev.br_startoff == NULLFILEOFF)
4133 *last_block = 0;
4134 else
4135 *last_block = prev.br_startoff + prev.br_blockcount;
4136 }
4137 /*
4138 * Otherwise *last_block is already the right answer.
4139 */
4140 return 0;
4141 }
4142
4143 /*
4144 * Returns the file-relative block number of the first block past eof in
4145 * the file. This is not based on i_size, it is based on the extent records.
4146 * Returns 0 for local files, as they do not have extent records.
4147 */
4148 int /* error */
4149 xfs_bmap_last_offset(
4150 xfs_trans_t *tp, /* transaction pointer */
4151 xfs_inode_t *ip, /* incore inode */
4152 xfs_fileoff_t *last_block, /* last block */
4153 int whichfork) /* data or attr fork */
4154 {
4155 xfs_bmbt_rec_host_t *ep; /* pointer to last extent */
4156 int error; /* error return value */
4157 xfs_ifork_t *ifp; /* inode fork pointer */
4158 xfs_extnum_t nextents; /* number of extent entries */
4159
4160 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4161 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4162 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
4163 return XFS_ERROR(EIO);
4164 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4165 *last_block = 0;
4166 return 0;
4167 }
4168 ifp = XFS_IFORK_PTR(ip, whichfork);
4169 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4170 (error = xfs_iread_extents(tp, ip, whichfork)))
4171 return error;
4172 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4173 if (!nextents) {
4174 *last_block = 0;
4175 return 0;
4176 }
4177 ep = xfs_iext_get_ext(ifp, nextents - 1);
4178 *last_block = xfs_bmbt_get_startoff(ep) + xfs_bmbt_get_blockcount(ep);
4179 return 0;
4180 }
4181
4182 /*
4183 * Returns whether the selected fork of the inode has exactly one
4184 * block or not. For the data fork we check this matches di_size,
4185 * implying the file's range is 0..bsize-1.
4186 */
4187 int /* 1=>1 block, 0=>otherwise */
4188 xfs_bmap_one_block(
4189 xfs_inode_t *ip, /* incore inode */
4190 int whichfork) /* data or attr fork */
4191 {
4192 xfs_bmbt_rec_host_t *ep; /* ptr to fork's extent */
4193 xfs_ifork_t *ifp; /* inode fork pointer */
4194 int rval; /* return value */
4195 xfs_bmbt_irec_t s; /* internal version of extent */
4196
4197 #ifndef DEBUG
4198 if (whichfork == XFS_DATA_FORK) {
4199 return ((ip->i_d.di_mode & S_IFMT) == S_IFREG) ?
4200 (ip->i_size == ip->i_mount->m_sb.sb_blocksize) :
4201 (ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize);
4202 }
4203 #endif /* !DEBUG */
4204 if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
4205 return 0;
4206 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
4207 return 0;
4208 ifp = XFS_IFORK_PTR(ip, whichfork);
4209 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
4210 ep = xfs_iext_get_ext(ifp, 0);
4211 xfs_bmbt_get_all(ep, &s);
4212 rval = s.br_startoff == 0 && s.br_blockcount == 1;
4213 if (rval && whichfork == XFS_DATA_FORK)
4214 ASSERT(ip->i_size == ip->i_mount->m_sb.sb_blocksize);
4215 return rval;
4216 }
4217
4218 STATIC int
4219 xfs_bmap_sanity_check(
4220 struct xfs_mount *mp,
4221 struct xfs_buf *bp,
4222 int level)
4223 {
4224 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
4225
4226 if (be32_to_cpu(block->bb_magic) != XFS_BMAP_MAGIC ||
4227 be16_to_cpu(block->bb_level) != level ||
4228 be16_to_cpu(block->bb_numrecs) == 0 ||
4229 be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
4230 return 0;
4231 return 1;
4232 }
4233
4234 /*
4235 * Read in the extents to if_extents.
4236 * All inode fields are set up by caller, we just traverse the btree
4237 * and copy the records in. If the file system cannot contain unwritten
4238 * extents, the records are checked for no "state" flags.
4239 */
4240 int /* error */
4241 xfs_bmap_read_extents(
4242 xfs_trans_t *tp, /* transaction pointer */
4243 xfs_inode_t *ip, /* incore inode */
4244 int whichfork) /* data or attr fork */
4245 {
4246 struct xfs_btree_block *block; /* current btree block */
4247 xfs_fsblock_t bno; /* block # of "block" */
4248 xfs_buf_t *bp; /* buffer for "block" */
4249 int error; /* error return value */
4250 xfs_exntfmt_t exntf; /* XFS_EXTFMT_NOSTATE, if checking */
4251 xfs_extnum_t i, j; /* index into the extents list */
4252 xfs_ifork_t *ifp; /* fork structure */
4253 int level; /* btree level, for checking */
4254 xfs_mount_t *mp; /* file system mount structure */
4255 __be64 *pp; /* pointer to block address */
4256 /* REFERENCED */
4257 xfs_extnum_t room; /* number of entries there's room for */
4258
4259 bno = NULLFSBLOCK;
4260 mp = ip->i_mount;
4261 ifp = XFS_IFORK_PTR(ip, whichfork);
4262 exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE :
4263 XFS_EXTFMT_INODE(ip);
4264 block = ifp->if_broot;
4265 /*
4266 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
4267 */
4268 level = be16_to_cpu(block->bb_level);
4269 ASSERT(level > 0);
4270 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
4271 bno = be64_to_cpu(*pp);
4272 ASSERT(bno != NULLDFSBNO);
4273 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
4274 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
4275 /*
4276 * Go down the tree until leaf level is reached, following the first
4277 * pointer (leftmost) at each level.
4278 */
4279 while (level-- > 0) {
4280 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4281 XFS_BMAP_BTREE_REF)))
4282 return error;
4283 block = XFS_BUF_TO_BLOCK(bp);
4284 XFS_WANT_CORRUPTED_GOTO(
4285 xfs_bmap_sanity_check(mp, bp, level),
4286 error0);
4287 if (level == 0)
4288 break;
4289 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
4290 bno = be64_to_cpu(*pp);
4291 XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
4292 xfs_trans_brelse(tp, bp);
4293 }
4294 /*
4295 * Here with bp and block set to the leftmost leaf node in the tree.
4296 */
4297 room = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4298 i = 0;
4299 /*
4300 * Loop over all leaf nodes. Copy information to the extent records.
4301 */
4302 for (;;) {
4303 xfs_bmbt_rec_t *frp;
4304 xfs_fsblock_t nextbno;
4305 xfs_extnum_t num_recs;
4306 xfs_extnum_t start;
4307
4308
4309 num_recs = xfs_btree_get_numrecs(block);
4310 if (unlikely(i + num_recs > room)) {
4311 ASSERT(i + num_recs <= room);
4312 xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
4313 "corrupt dinode %Lu, (btree extents).",
4314 (unsigned long long) ip->i_ino);
4315 XFS_ERROR_REPORT("xfs_bmap_read_extents(1)",
4316 XFS_ERRLEVEL_LOW,
4317 ip->i_mount);
4318 goto error0;
4319 }
4320 XFS_WANT_CORRUPTED_GOTO(
4321 xfs_bmap_sanity_check(mp, bp, 0),
4322 error0);
4323 /*
4324 * Read-ahead the next leaf block, if any.
4325 */
4326 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
4327 if (nextbno != NULLFSBLOCK)
4328 xfs_btree_reada_bufl(mp, nextbno, 1);
4329 /*
4330 * Copy records into the extent records.
4331 */
4332 frp = XFS_BMBT_REC_ADDR(mp, block, 1);
4333 start = i;
4334 for (j = 0; j < num_recs; j++, i++, frp++) {
4335 xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i);
4336 trp->l0 = be64_to_cpu(frp->l0);
4337 trp->l1 = be64_to_cpu(frp->l1);
4338 }
4339 if (exntf == XFS_EXTFMT_NOSTATE) {
4340 /*
4341 * Check all attribute bmap btree records and
4342 * any "older" data bmap btree records for a
4343 * set bit in the "extent flag" position.
4344 */
4345 if (unlikely(xfs_check_nostate_extents(ifp,
4346 start, num_recs))) {
4347 XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
4348 XFS_ERRLEVEL_LOW,
4349 ip->i_mount);
4350 goto error0;
4351 }
4352 }
4353 xfs_trans_brelse(tp, bp);
4354 bno = nextbno;
4355 /*
4356 * If we've reached the end, stop.
4357 */
4358 if (bno == NULLFSBLOCK)
4359 break;
4360 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4361 XFS_BMAP_BTREE_REF)))
4362 return error;
4363 block = XFS_BUF_TO_BLOCK(bp);
4364 }
4365 ASSERT(i == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
4366 ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork));
4367 XFS_BMAP_TRACE_EXLIST(ip, i, whichfork);
4368 return 0;
4369 error0:
4370 xfs_trans_brelse(tp, bp);
4371 return XFS_ERROR(EFSCORRUPTED);
4372 }
4373
4374 #ifdef DEBUG
4375 /*
4376 * Add bmap trace insert entries for all the contents of the extent records.
4377 */
4378 void
4379 xfs_bmap_trace_exlist(
4380 xfs_inode_t *ip, /* incore inode pointer */
4381 xfs_extnum_t cnt, /* count of entries in the list */
4382 int whichfork, /* data or attr fork */
4383 unsigned long caller_ip)
4384 {
4385 xfs_extnum_t idx; /* extent record index */
4386 xfs_ifork_t *ifp; /* inode fork pointer */
4387 int state = 0;
4388
4389 if (whichfork == XFS_ATTR_FORK)
4390 state |= BMAP_ATTRFORK;
4391
4392 ifp = XFS_IFORK_PTR(ip, whichfork);
4393 ASSERT(cnt == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
4394 for (idx = 0; idx < cnt; idx++)
4395 trace_xfs_extlist(ip, idx, whichfork, caller_ip);
4396 }
4397
4398 /*
4399 * Validate that the bmbt_irecs being returned from bmapi are valid
4400 * given the callers original parameters. Specifically check the
4401 * ranges of the returned irecs to ensure that they only extent beyond
4402 * the given parameters if the XFS_BMAPI_ENTIRE flag was set.
4403 */
4404 STATIC void
4405 xfs_bmap_validate_ret(
4406 xfs_fileoff_t bno,
4407 xfs_filblks_t len,
4408 int flags,
4409 xfs_bmbt_irec_t *mval,
4410 int nmap,
4411 int ret_nmap)
4412 {
4413 int i; /* index to map values */
4414
4415 ASSERT(ret_nmap <= nmap);
4416
4417 for (i = 0; i < ret_nmap; i++) {
4418 ASSERT(mval[i].br_blockcount > 0);
4419 if (!(flags & XFS_BMAPI_ENTIRE)) {
4420 ASSERT(mval[i].br_startoff >= bno);
4421 ASSERT(mval[i].br_blockcount <= len);
4422 ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
4423 bno + len);
4424 } else {
4425 ASSERT(mval[i].br_startoff < bno + len);
4426 ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
4427 bno);
4428 }
4429 ASSERT(i == 0 ||
4430 mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
4431 mval[i].br_startoff);
4432 if ((flags & XFS_BMAPI_WRITE) && !(flags & XFS_BMAPI_DELAY))
4433 ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
4434 mval[i].br_startblock != HOLESTARTBLOCK);
4435 ASSERT(mval[i].br_state == XFS_EXT_NORM ||
4436 mval[i].br_state == XFS_EXT_UNWRITTEN);
4437 }
4438 }
4439 #endif /* DEBUG */
4440
4441
4442 /*
4443 * Map file blocks to filesystem blocks.
4444 * File range is given by the bno/len pair.
4445 * Adds blocks to file if a write ("flags & XFS_BMAPI_WRITE" set)
4446 * into a hole or past eof.
4447 * Only allocates blocks from a single allocation group,
4448 * to avoid locking problems.
4449 * The returned value in "firstblock" from the first call in a transaction
4450 * must be remembered and presented to subsequent calls in "firstblock".
4451 * An upper bound for the number of blocks to be allocated is supplied to
4452 * the first call in "total"; if no allocation group has that many free
4453 * blocks then the call will fail (return NULLFSBLOCK in "firstblock").
4454 */
4455 int /* error */
4456 xfs_bmapi(
4457 xfs_trans_t *tp, /* transaction pointer */
4458 xfs_inode_t *ip, /* incore inode */
4459 xfs_fileoff_t bno, /* starting file offs. mapped */
4460 xfs_filblks_t len, /* length to map in file */
4461 int flags, /* XFS_BMAPI_... */
4462 xfs_fsblock_t *firstblock, /* first allocated block
4463 controls a.g. for allocs */
4464 xfs_extlen_t total, /* total blocks needed */
4465 xfs_bmbt_irec_t *mval, /* output: map values */
4466 int *nmap, /* i/o: mval size/count */
4467 xfs_bmap_free_t *flist, /* i/o: list extents to free */
4468 xfs_extdelta_t *delta) /* o: change made to incore extents */
4469 {
4470 xfs_fsblock_t abno; /* allocated block number */
4471 xfs_extlen_t alen; /* allocated extent length */
4472 xfs_fileoff_t aoff; /* allocated file offset */
4473 xfs_bmalloca_t bma; /* args for xfs_bmap_alloc */
4474 xfs_btree_cur_t *cur; /* bmap btree cursor */
4475 xfs_fileoff_t end; /* end of mapped file region */
4476 int eof; /* we've hit the end of extents */
4477 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
4478 int error; /* error return */
4479 xfs_bmbt_irec_t got; /* current file extent record */
4480 xfs_ifork_t *ifp; /* inode fork pointer */
4481 xfs_extlen_t indlen; /* indirect blocks length */
4482 xfs_extnum_t lastx; /* last useful extent number */
4483 int logflags; /* flags for transaction logging */
4484 xfs_extlen_t minleft; /* min blocks left after allocation */
4485 xfs_extlen_t minlen; /* min allocation size */
4486 xfs_mount_t *mp; /* xfs mount structure */
4487 int n; /* current extent index */
4488 int nallocs; /* number of extents alloc'd */
4489 xfs_extnum_t nextents; /* number of extents in file */
4490 xfs_fileoff_t obno; /* old block number (offset) */
4491 xfs_bmbt_irec_t prev; /* previous file extent record */
4492 int tmp_logflags; /* temp flags holder */
4493 int whichfork; /* data or attr fork */
4494 char inhole; /* current location is hole in file */
4495 char wasdelay; /* old extent was delayed */
4496 char wr; /* this is a write request */
4497 char rt; /* this is a realtime file */
4498 #ifdef DEBUG
4499 xfs_fileoff_t orig_bno; /* original block number value */
4500 int orig_flags; /* original flags arg value */
4501 xfs_filblks_t orig_len; /* original value of len arg */
4502 xfs_bmbt_irec_t *orig_mval; /* original value of mval */
4503 int orig_nmap; /* original value of *nmap */
4504
4505 orig_bno = bno;
4506 orig_len = len;
4507 orig_flags = flags;
4508 orig_mval = mval;
4509 orig_nmap = *nmap;
4510 #endif
4511 ASSERT(*nmap >= 1);
4512 ASSERT(*nmap <= XFS_BMAP_MAX_NMAP || !(flags & XFS_BMAPI_WRITE));
4513 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4514 XFS_ATTR_FORK : XFS_DATA_FORK;
4515 mp = ip->i_mount;
4516 if (unlikely(XFS_TEST_ERROR(
4517 (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4518 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4519 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL),
4520 mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
4521 XFS_ERROR_REPORT("xfs_bmapi", XFS_ERRLEVEL_LOW, mp);
4522 return XFS_ERROR(EFSCORRUPTED);
4523 }
4524 if (XFS_FORCED_SHUTDOWN(mp))
4525 return XFS_ERROR(EIO);
4526 rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
4527 ifp = XFS_IFORK_PTR(ip, whichfork);
4528 ASSERT(ifp->if_ext_max ==
4529 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
4530 if ((wr = (flags & XFS_BMAPI_WRITE)) != 0)
4531 XFS_STATS_INC(xs_blk_mapw);
4532 else
4533 XFS_STATS_INC(xs_blk_mapr);
4534 /*
4535 * IGSTATE flag is used to combine extents which
4536 * differ only due to the state of the extents.
4537 * This technique is used from xfs_getbmap()
4538 * when the caller does not wish to see the
4539 * separation (which is the default).
4540 *
4541 * This technique is also used when writing a
4542 * buffer which has been partially written,
4543 * (usually by being flushed during a chunkread),
4544 * to ensure one write takes place. This also
4545 * prevents a change in the xfs inode extents at
4546 * this time, intentionally. This change occurs
4547 * on completion of the write operation, in
4548 * xfs_strat_comp(), where the xfs_bmapi() call
4549 * is transactioned, and the extents combined.
4550 */
4551 if ((flags & XFS_BMAPI_IGSTATE) && wr) /* if writing unwritten space */
4552 wr = 0; /* no allocations are allowed */
4553 ASSERT(wr || !(flags & XFS_BMAPI_DELAY));
4554 logflags = 0;
4555 nallocs = 0;
4556 cur = NULL;
4557 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4558 ASSERT(wr && tp);
4559 if ((error = xfs_bmap_local_to_extents(tp, ip,
4560 firstblock, total, &logflags, whichfork)))
4561 goto error0;
4562 }
4563 if (wr && *firstblock == NULLFSBLOCK) {
4564 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
4565 minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1;
4566 else
4567 minleft = 1;
4568 } else
4569 minleft = 0;
4570 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4571 (error = xfs_iread_extents(tp, ip, whichfork)))
4572 goto error0;
4573 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
4574 &prev);
4575 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4576 n = 0;
4577 end = bno + len;
4578 obno = bno;
4579 bma.ip = NULL;
4580 if (delta) {
4581 delta->xed_startoff = NULLFILEOFF;
4582 delta->xed_blockcount = 0;
4583 }
4584 while (bno < end && n < *nmap) {
4585 /*
4586 * Reading past eof, act as though there's a hole
4587 * up to end.
4588 */
4589 if (eof && !wr)
4590 got.br_startoff = end;
4591 inhole = eof || got.br_startoff > bno;
4592 wasdelay = wr && !inhole && !(flags & XFS_BMAPI_DELAY) &&
4593 isnullstartblock(got.br_startblock);
4594 /*
4595 * First, deal with the hole before the allocated space
4596 * that we found, if any.
4597 */
4598 if (wr && (inhole || wasdelay)) {
4599 /*
4600 * For the wasdelay case, we could also just
4601 * allocate the stuff asked for in this bmap call
4602 * but that wouldn't be as good.
4603 */
4604 if (wasdelay && !(flags & XFS_BMAPI_EXACT)) {
4605 alen = (xfs_extlen_t)got.br_blockcount;
4606 aoff = got.br_startoff;
4607 if (lastx != NULLEXTNUM && lastx) {
4608 ep = xfs_iext_get_ext(ifp, lastx - 1);
4609 xfs_bmbt_get_all(ep, &prev);
4610 }
4611 } else if (wasdelay) {
4612 alen = (xfs_extlen_t)
4613 XFS_FILBLKS_MIN(len,
4614 (got.br_startoff +
4615 got.br_blockcount) - bno);
4616 aoff = bno;
4617 } else {
4618 alen = (xfs_extlen_t)
4619 XFS_FILBLKS_MIN(len, MAXEXTLEN);
4620 if (!eof)
4621 alen = (xfs_extlen_t)
4622 XFS_FILBLKS_MIN(alen,
4623 got.br_startoff - bno);
4624 aoff = bno;
4625 }
4626 minlen = (flags & XFS_BMAPI_CONTIG) ? alen : 1;
4627 if (flags & XFS_BMAPI_DELAY) {
4628 xfs_extlen_t extsz;
4629
4630 /* Figure out the extent size, adjust alen */
4631 extsz = xfs_get_extsz_hint(ip);
4632 if (extsz) {
4633 error = xfs_bmap_extsize_align(mp,
4634 &got, &prev, extsz,
4635 rt, eof,
4636 flags&XFS_BMAPI_DELAY,
4637 flags&XFS_BMAPI_CONVERT,
4638 &aoff, &alen);
4639 ASSERT(!error);
4640 }
4641
4642 if (rt)
4643 extsz = alen / mp->m_sb.sb_rextsize;
4644
4645 /*
4646 * Make a transaction-less quota reservation for
4647 * delayed allocation blocks. This number gets
4648 * adjusted later. We return if we haven't
4649 * allocated blocks already inside this loop.
4650 */
4651 error = xfs_trans_reserve_quota_nblks(
4652 NULL, ip, (long)alen, 0,
4653 rt ? XFS_QMOPT_RES_RTBLKS :
4654 XFS_QMOPT_RES_REGBLKS);
4655 if (error) {
4656 if (n == 0) {
4657 *nmap = 0;
4658 ASSERT(cur == NULL);
4659 return error;
4660 }
4661 break;
4662 }
4663
4664 /*
4665 * Split changing sb for alen and indlen since
4666 * they could be coming from different places.
4667 */
4668 indlen = (xfs_extlen_t)
4669 xfs_bmap_worst_indlen(ip, alen);
4670 ASSERT(indlen > 0);
4671
4672 if (rt) {
4673 error = xfs_mod_incore_sb(mp,
4674 XFS_SBS_FREXTENTS,
4675 -((int64_t)extsz), (flags &
4676 XFS_BMAPI_RSVBLOCKS));
4677 } else {
4678 error = xfs_mod_incore_sb(mp,
4679 XFS_SBS_FDBLOCKS,
4680 -((int64_t)alen), (flags &
4681 XFS_BMAPI_RSVBLOCKS));
4682 }
4683 if (!error) {
4684 error = xfs_mod_incore_sb(mp,
4685 XFS_SBS_FDBLOCKS,
4686 -((int64_t)indlen), (flags &
4687 XFS_BMAPI_RSVBLOCKS));
4688 if (error && rt)
4689 xfs_mod_incore_sb(mp,
4690 XFS_SBS_FREXTENTS,
4691 (int64_t)extsz, (flags &
4692 XFS_BMAPI_RSVBLOCKS));
4693 else if (error)
4694 xfs_mod_incore_sb(mp,
4695 XFS_SBS_FDBLOCKS,
4696 (int64_t)alen, (flags &
4697 XFS_BMAPI_RSVBLOCKS));
4698 }
4699
4700 if (error) {
4701 if (XFS_IS_QUOTA_ON(mp))
4702 /* unreserve the blocks now */
4703 (void)
4704 xfs_trans_unreserve_quota_nblks(
4705 NULL, ip,
4706 (long)alen, 0, rt ?
4707 XFS_QMOPT_RES_RTBLKS :
4708 XFS_QMOPT_RES_REGBLKS);
4709 break;
4710 }
4711
4712 ip->i_delayed_blks += alen;
4713 abno = nullstartblock(indlen);
4714 } else {
4715 /*
4716 * If first time, allocate and fill in
4717 * once-only bma fields.
4718 */
4719 if (bma.ip == NULL) {
4720 bma.tp = tp;
4721 bma.ip = ip;
4722 bma.prevp = &prev;
4723 bma.gotp = &got;
4724 bma.total = total;
4725 bma.userdata = 0;
4726 }
4727 /* Indicate if this is the first user data
4728 * in the file, or just any user data.
4729 */
4730 if (!(flags & XFS_BMAPI_METADATA)) {
4731 bma.userdata = (aoff == 0) ?
4732 XFS_ALLOC_INITIAL_USER_DATA :
4733 XFS_ALLOC_USERDATA;
4734 }
4735 /*
4736 * Fill in changeable bma fields.
4737 */
4738 bma.eof = eof;
4739 bma.firstblock = *firstblock;
4740 bma.alen = alen;
4741 bma.off = aoff;
4742 bma.conv = !!(flags & XFS_BMAPI_CONVERT);
4743 bma.wasdel = wasdelay;
4744 bma.minlen = minlen;
4745 bma.low = flist->xbf_low;
4746 bma.minleft = minleft;
4747 /*
4748 * Only want to do the alignment at the
4749 * eof if it is userdata and allocation length
4750 * is larger than a stripe unit.
4751 */
4752 if (mp->m_dalign && alen >= mp->m_dalign &&
4753 (!(flags & XFS_BMAPI_METADATA)) &&
4754 (whichfork == XFS_DATA_FORK)) {
4755 if ((error = xfs_bmap_isaeof(ip, aoff,
4756 whichfork, &bma.aeof)))
4757 goto error0;
4758 } else
4759 bma.aeof = 0;
4760 /*
4761 * Call allocator.
4762 */
4763 if ((error = xfs_bmap_alloc(&bma)))
4764 goto error0;
4765 /*
4766 * Copy out result fields.
4767 */
4768 abno = bma.rval;
4769 if ((flist->xbf_low = bma.low))
4770 minleft = 0;
4771 alen = bma.alen;
4772 aoff = bma.off;
4773 ASSERT(*firstblock == NULLFSBLOCK ||
4774 XFS_FSB_TO_AGNO(mp, *firstblock) ==
4775 XFS_FSB_TO_AGNO(mp, bma.firstblock) ||
4776 (flist->xbf_low &&
4777 XFS_FSB_TO_AGNO(mp, *firstblock) <
4778 XFS_FSB_TO_AGNO(mp, bma.firstblock)));
4779 *firstblock = bma.firstblock;
4780 if (cur)
4781 cur->bc_private.b.firstblock =
4782 *firstblock;
4783 if (abno == NULLFSBLOCK)
4784 break;
4785 if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
4786 cur = xfs_bmbt_init_cursor(mp, tp,
4787 ip, whichfork);
4788 cur->bc_private.b.firstblock =
4789 *firstblock;
4790 cur->bc_private.b.flist = flist;
4791 }
4792 /*
4793 * Bump the number of extents we've allocated
4794 * in this call.
4795 */
4796 nallocs++;
4797 }
4798 if (cur)
4799 cur->bc_private.b.flags =
4800 wasdelay ? XFS_BTCUR_BPRV_WASDEL : 0;
4801 got.br_startoff = aoff;
4802 got.br_startblock = abno;
4803 got.br_blockcount = alen;
4804 got.br_state = XFS_EXT_NORM; /* assume normal */
4805 /*
4806 * Determine state of extent, and the filesystem.
4807 * A wasdelay extent has been initialized, so
4808 * shouldn't be flagged as unwritten.
4809 */
4810 if (wr && xfs_sb_version_hasextflgbit(&mp->m_sb)) {
4811 if (!wasdelay && (flags & XFS_BMAPI_PREALLOC))
4812 got.br_state = XFS_EXT_UNWRITTEN;
4813 }
4814 error = xfs_bmap_add_extent(ip, lastx, &cur, &got,
4815 firstblock, flist, &tmp_logflags, delta,
4816 whichfork, (flags & XFS_BMAPI_RSVBLOCKS));
4817 logflags |= tmp_logflags;
4818 if (error)
4819 goto error0;
4820 lastx = ifp->if_lastex;
4821 ep = xfs_iext_get_ext(ifp, lastx);
4822 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4823 xfs_bmbt_get_all(ep, &got);
4824 ASSERT(got.br_startoff <= aoff);
4825 ASSERT(got.br_startoff + got.br_blockcount >=
4826 aoff + alen);
4827 #ifdef DEBUG
4828 if (flags & XFS_BMAPI_DELAY) {
4829 ASSERT(isnullstartblock(got.br_startblock));
4830 ASSERT(startblockval(got.br_startblock) > 0);
4831 }
4832 ASSERT(got.br_state == XFS_EXT_NORM ||
4833 got.br_state == XFS_EXT_UNWRITTEN);
4834 #endif
4835 /*
4836 * Fall down into the found allocated space case.
4837 */
4838 } else if (inhole) {
4839 /*
4840 * Reading in a hole.
4841 */
4842 mval->br_startoff = bno;
4843 mval->br_startblock = HOLESTARTBLOCK;
4844 mval->br_blockcount =
4845 XFS_FILBLKS_MIN(len, got.br_startoff - bno);
4846 mval->br_state = XFS_EXT_NORM;
4847 bno += mval->br_blockcount;
4848 len -= mval->br_blockcount;
4849 mval++;
4850 n++;
4851 continue;
4852 }
4853 /*
4854 * Then deal with the allocated space we found.
4855 */
4856 ASSERT(ep != NULL);
4857 if (!(flags & XFS_BMAPI_ENTIRE) &&
4858 (got.br_startoff + got.br_blockcount > obno)) {
4859 if (obno > bno)
4860 bno = obno;
4861 ASSERT((bno >= obno) || (n == 0));
4862 ASSERT(bno < end);
4863 mval->br_startoff = bno;
4864 if (isnullstartblock(got.br_startblock)) {
4865 ASSERT(!wr || (flags & XFS_BMAPI_DELAY));
4866 mval->br_startblock = DELAYSTARTBLOCK;
4867 } else
4868 mval->br_startblock =
4869 got.br_startblock +
4870 (bno - got.br_startoff);
4871 /*
4872 * Return the minimum of what we got and what we
4873 * asked for for the length. We can use the len
4874 * variable here because it is modified below
4875 * and we could have been there before coming
4876 * here if the first part of the allocation
4877 * didn't overlap what was asked for.
4878 */
4879 mval->br_blockcount =
4880 XFS_FILBLKS_MIN(end - bno, got.br_blockcount -
4881 (bno - got.br_startoff));
4882 mval->br_state = got.br_state;
4883 ASSERT(mval->br_blockcount <= len);
4884 } else {
4885 *mval = got;
4886 if (isnullstartblock(mval->br_startblock)) {
4887 ASSERT(!wr || (flags & XFS_BMAPI_DELAY));
4888 mval->br_startblock = DELAYSTARTBLOCK;
4889 }
4890 }
4891
4892 /*
4893 * Check if writing previously allocated but
4894 * unwritten extents.
4895 */
4896 if (wr && mval->br_state == XFS_EXT_UNWRITTEN &&
4897 ((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_DELAY)) == 0)) {
4898 /*
4899 * Modify (by adding) the state flag, if writing.
4900 */
4901 ASSERT(mval->br_blockcount <= len);
4902 if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
4903 cur = xfs_bmbt_init_cursor(mp,
4904 tp, ip, whichfork);
4905 cur->bc_private.b.firstblock =
4906 *firstblock;
4907 cur->bc_private.b.flist = flist;
4908 }
4909 mval->br_state = XFS_EXT_NORM;
4910 error = xfs_bmap_add_extent(ip, lastx, &cur, mval,
4911 firstblock, flist, &tmp_logflags, delta,
4912 whichfork, (flags & XFS_BMAPI_RSVBLOCKS));
4913 logflags |= tmp_logflags;
4914 if (error)
4915 goto error0;
4916 lastx = ifp->if_lastex;
4917 ep = xfs_iext_get_ext(ifp, lastx);
4918 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4919 xfs_bmbt_get_all(ep, &got);
4920 /*
4921 * We may have combined previously unwritten
4922 * space with written space, so generate
4923 * another request.
4924 */
4925 if (mval->br_blockcount < len)
4926 continue;
4927 }
4928
4929 ASSERT((flags & XFS_BMAPI_ENTIRE) ||
4930 ((mval->br_startoff + mval->br_blockcount) <= end));
4931 ASSERT((flags & XFS_BMAPI_ENTIRE) ||
4932 (mval->br_blockcount <= len) ||
4933 (mval->br_startoff < obno));
4934 bno = mval->br_startoff + mval->br_blockcount;
4935 len = end - bno;
4936 if (n > 0 && mval->br_startoff == mval[-1].br_startoff) {
4937 ASSERT(mval->br_startblock == mval[-1].br_startblock);
4938 ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
4939 ASSERT(mval->br_state == mval[-1].br_state);
4940 mval[-1].br_blockcount = mval->br_blockcount;
4941 mval[-1].br_state = mval->br_state;
4942 } else if (n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
4943 mval[-1].br_startblock != DELAYSTARTBLOCK &&
4944 mval[-1].br_startblock != HOLESTARTBLOCK &&
4945 mval->br_startblock ==
4946 mval[-1].br_startblock + mval[-1].br_blockcount &&
4947 ((flags & XFS_BMAPI_IGSTATE) ||
4948 mval[-1].br_state == mval->br_state)) {
4949 ASSERT(mval->br_startoff ==
4950 mval[-1].br_startoff + mval[-1].br_blockcount);
4951 mval[-1].br_blockcount += mval->br_blockcount;
4952 } else if (n > 0 &&
4953 mval->br_startblock == DELAYSTARTBLOCK &&
4954 mval[-1].br_startblock == DELAYSTARTBLOCK &&
4955 mval->br_startoff ==
4956 mval[-1].br_startoff + mval[-1].br_blockcount) {
4957 mval[-1].br_blockcount += mval->br_blockcount;
4958 mval[-1].br_state = mval->br_state;
4959 } else if (!((n == 0) &&
4960 ((mval->br_startoff + mval->br_blockcount) <=
4961 obno))) {
4962 mval++;
4963 n++;
4964 }
4965 /*
4966 * If we're done, stop now. Stop when we've allocated
4967 * XFS_BMAP_MAX_NMAP extents no matter what. Otherwise
4968 * the transaction may get too big.
4969 */
4970 if (bno >= end || n >= *nmap || nallocs >= *nmap)
4971 break;
4972 /*
4973 * Else go on to the next record.
4974 */
4975 ep = xfs_iext_get_ext(ifp, ++lastx);
4976 prev = got;
4977 if (lastx >= nextents)
4978 eof = 1;
4979 else
4980 xfs_bmbt_get_all(ep, &got);
4981 }
4982 ifp->if_lastex = lastx;
4983 *nmap = n;
4984 /*
4985 * Transform from btree to extents, give it cur.
4986 */
4987 if (tp && XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
4988 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
4989 ASSERT(wr && cur);
4990 error = xfs_bmap_btree_to_extents(tp, ip, cur,
4991 &tmp_logflags, whichfork);
4992 logflags |= tmp_logflags;
4993 if (error)
4994 goto error0;
4995 }
4996 ASSERT(ifp->if_ext_max ==
4997 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
4998 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
4999 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max);
5000 error = 0;
5001 if (delta && delta->xed_startoff != NULLFILEOFF) {
5002 /* A change was actually made.
5003 * Note that delta->xed_blockount is an offset at this
5004 * point and needs to be converted to a block count.
5005 */
5006 ASSERT(delta->xed_blockcount > delta->xed_startoff);
5007 delta->xed_blockcount -= delta->xed_startoff;
5008 }
5009 error0:
5010 /*
5011 * Log everything. Do this after conversion, there's no point in
5012 * logging the extent records if we've converted to btree format.
5013 */
5014 if ((logflags & xfs_ilog_fext(whichfork)) &&
5015 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5016 logflags &= ~xfs_ilog_fext(whichfork);
5017 else if ((logflags & xfs_ilog_fbroot(whichfork)) &&
5018 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5019 logflags &= ~xfs_ilog_fbroot(whichfork);
5020 /*
5021 * Log whatever the flags say, even if error. Otherwise we might miss
5022 * detecting a case where the data is changed, there's an error,
5023 * and it's not logged so we don't shutdown when we should.
5024 */
5025 if (logflags) {
5026 ASSERT(tp && wr);
5027 xfs_trans_log_inode(tp, ip, logflags);
5028 }
5029 if (cur) {
5030 if (!error) {
5031 ASSERT(*firstblock == NULLFSBLOCK ||
5032 XFS_FSB_TO_AGNO(mp, *firstblock) ==
5033 XFS_FSB_TO_AGNO(mp,
5034 cur->bc_private.b.firstblock) ||
5035 (flist->xbf_low &&
5036 XFS_FSB_TO_AGNO(mp, *firstblock) <
5037 XFS_FSB_TO_AGNO(mp,
5038 cur->bc_private.b.firstblock)));
5039 *firstblock = cur->bc_private.b.firstblock;
5040 }
5041 xfs_btree_del_cursor(cur,
5042 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5043 }
5044 if (!error)
5045 xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
5046 orig_nmap, *nmap);
5047 return error;
5048 }
5049
5050 /*
5051 * Map file blocks to filesystem blocks, simple version.
5052 * One block (extent) only, read-only.
5053 * For flags, only the XFS_BMAPI_ATTRFORK flag is examined.
5054 * For the other flag values, the effect is as if XFS_BMAPI_METADATA
5055 * was set and all the others were clear.
5056 */
5057 int /* error */
5058 xfs_bmapi_single(
5059 xfs_trans_t *tp, /* transaction pointer */
5060 xfs_inode_t *ip, /* incore inode */
5061 int whichfork, /* data or attr fork */
5062 xfs_fsblock_t *fsb, /* output: mapped block */
5063 xfs_fileoff_t bno) /* starting file offs. mapped */
5064 {
5065 int eof; /* we've hit the end of extents */
5066 int error; /* error return */
5067 xfs_bmbt_irec_t got; /* current file extent record */
5068 xfs_ifork_t *ifp; /* inode fork pointer */
5069 xfs_extnum_t lastx; /* last useful extent number */
5070 xfs_bmbt_irec_t prev; /* previous file extent record */
5071
5072 ifp = XFS_IFORK_PTR(ip, whichfork);
5073 if (unlikely(
5074 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
5075 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)) {
5076 XFS_ERROR_REPORT("xfs_bmapi_single", XFS_ERRLEVEL_LOW,
5077 ip->i_mount);
5078 return XFS_ERROR(EFSCORRUPTED);
5079 }
5080 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
5081 return XFS_ERROR(EIO);
5082 XFS_STATS_INC(xs_blk_mapr);
5083 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5084 (error = xfs_iread_extents(tp, ip, whichfork)))
5085 return error;
5086 (void)xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
5087 &prev);
5088 /*
5089 * Reading past eof, act as though there's a hole
5090 * up to end.
5091 */
5092 if (eof || got.br_startoff > bno) {
5093 *fsb = NULLFSBLOCK;
5094 return 0;
5095 }
5096 ASSERT(!isnullstartblock(got.br_startblock));
5097 ASSERT(bno < got.br_startoff + got.br_blockcount);
5098 *fsb = got.br_startblock + (bno - got.br_startoff);
5099 ifp->if_lastex = lastx;
5100 return 0;
5101 }
5102
5103 /*
5104 * Unmap (remove) blocks from a file.
5105 * If nexts is nonzero then the number of extents to remove is limited to
5106 * that value. If not all extents in the block range can be removed then
5107 * *done is set.
5108 */
5109 int /* error */
5110 xfs_bunmapi(
5111 xfs_trans_t *tp, /* transaction pointer */
5112 struct xfs_inode *ip, /* incore inode */
5113 xfs_fileoff_t bno, /* starting offset to unmap */
5114 xfs_filblks_t len, /* length to unmap in file */
5115 int flags, /* misc flags */
5116 xfs_extnum_t nexts, /* number of extents max */
5117 xfs_fsblock_t *firstblock, /* first allocated block
5118 controls a.g. for allocs */
5119 xfs_bmap_free_t *flist, /* i/o: list extents to free */
5120 xfs_extdelta_t *delta, /* o: change made to incore
5121 extents */
5122 int *done) /* set if not done yet */
5123 {
5124 xfs_btree_cur_t *cur; /* bmap btree cursor */
5125 xfs_bmbt_irec_t del; /* extent being deleted */
5126 int eof; /* is deleting at eof */
5127 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
5128 int error; /* error return value */
5129 xfs_extnum_t extno; /* extent number in list */
5130 xfs_bmbt_irec_t got; /* current extent record */
5131 xfs_ifork_t *ifp; /* inode fork pointer */
5132 int isrt; /* freeing in rt area */
5133 xfs_extnum_t lastx; /* last extent index used */
5134 int logflags; /* transaction logging flags */
5135 xfs_extlen_t mod; /* rt extent offset */
5136 xfs_mount_t *mp; /* mount structure */
5137 xfs_extnum_t nextents; /* number of file extents */
5138 xfs_bmbt_irec_t prev; /* previous extent record */
5139 xfs_fileoff_t start; /* first file offset deleted */
5140 int tmp_logflags; /* partial logging flags */
5141 int wasdel; /* was a delayed alloc extent */
5142 int whichfork; /* data or attribute fork */
5143 int rsvd; /* OK to allocate reserved blocks */
5144 xfs_fsblock_t sum;
5145
5146 trace_xfs_bunmap(ip, bno, len, flags, _RET_IP_);
5147
5148 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
5149 XFS_ATTR_FORK : XFS_DATA_FORK;
5150 ifp = XFS_IFORK_PTR(ip, whichfork);
5151 if (unlikely(
5152 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
5153 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
5154 XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW,
5155 ip->i_mount);
5156 return XFS_ERROR(EFSCORRUPTED);
5157 }
5158 mp = ip->i_mount;
5159 if (XFS_FORCED_SHUTDOWN(mp))
5160 return XFS_ERROR(EIO);
5161 rsvd = (flags & XFS_BMAPI_RSVBLOCKS) != 0;
5162 ASSERT(len > 0);
5163 ASSERT(nexts >= 0);
5164 ASSERT(ifp->if_ext_max ==
5165 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5166 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5167 (error = xfs_iread_extents(tp, ip, whichfork)))
5168 return error;
5169 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5170 if (nextents == 0) {
5171 *done = 1;
5172 return 0;
5173 }
5174 XFS_STATS_INC(xs_blk_unmap);
5175 isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
5176 start = bno;
5177 bno = start + len - 1;
5178 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
5179 &prev);
5180 if (delta) {
5181 delta->xed_startoff = NULLFILEOFF;
5182 delta->xed_blockcount = 0;
5183 }
5184 /*
5185 * Check to see if the given block number is past the end of the
5186 * file, back up to the last block if so...
5187 */
5188 if (eof) {
5189 ep = xfs_iext_get_ext(ifp, --lastx);
5190 xfs_bmbt_get_all(ep, &got);
5191 bno = got.br_startoff + got.br_blockcount - 1;
5192 }
5193 logflags = 0;
5194 if (ifp->if_flags & XFS_IFBROOT) {
5195 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
5196 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
5197 cur->bc_private.b.firstblock = *firstblock;
5198 cur->bc_private.b.flist = flist;
5199 cur->bc_private.b.flags = 0;
5200 } else
5201 cur = NULL;
5202 extno = 0;
5203 while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
5204 (nexts == 0 || extno < nexts)) {
5205 /*
5206 * Is the found extent after a hole in which bno lives?
5207 * Just back up to the previous extent, if so.
5208 */
5209 if (got.br_startoff > bno) {
5210 if (--lastx < 0)
5211 break;
5212 ep = xfs_iext_get_ext(ifp, lastx);
5213 xfs_bmbt_get_all(ep, &got);
5214 }
5215 /*
5216 * Is the last block of this extent before the range
5217 * we're supposed to delete? If so, we're done.
5218 */
5219 bno = XFS_FILEOFF_MIN(bno,
5220 got.br_startoff + got.br_blockcount - 1);
5221 if (bno < start)
5222 break;
5223 /*
5224 * Then deal with the (possibly delayed) allocated space
5225 * we found.
5226 */
5227 ASSERT(ep != NULL);
5228 del = got;
5229 wasdel = isnullstartblock(del.br_startblock);
5230 if (got.br_startoff < start) {
5231 del.br_startoff = start;
5232 del.br_blockcount -= start - got.br_startoff;
5233 if (!wasdel)
5234 del.br_startblock += start - got.br_startoff;
5235 }
5236 if (del.br_startoff + del.br_blockcount > bno + 1)
5237 del.br_blockcount = bno + 1 - del.br_startoff;
5238 sum = del.br_startblock + del.br_blockcount;
5239 if (isrt &&
5240 (mod = do_mod(sum, mp->m_sb.sb_rextsize))) {
5241 /*
5242 * Realtime extent not lined up at the end.
5243 * The extent could have been split into written
5244 * and unwritten pieces, or we could just be
5245 * unmapping part of it. But we can't really
5246 * get rid of part of a realtime extent.
5247 */
5248 if (del.br_state == XFS_EXT_UNWRITTEN ||
5249 !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5250 /*
5251 * This piece is unwritten, or we're not
5252 * using unwritten extents. Skip over it.
5253 */
5254 ASSERT(bno >= mod);
5255 bno -= mod > del.br_blockcount ?
5256 del.br_blockcount : mod;
5257 if (bno < got.br_startoff) {
5258 if (--lastx >= 0)
5259 xfs_bmbt_get_all(xfs_iext_get_ext(
5260 ifp, lastx), &got);
5261 }
5262 continue;
5263 }
5264 /*
5265 * It's written, turn it unwritten.
5266 * This is better than zeroing it.
5267 */
5268 ASSERT(del.br_state == XFS_EXT_NORM);
5269 ASSERT(xfs_trans_get_block_res(tp) > 0);
5270 /*
5271 * If this spans a realtime extent boundary,
5272 * chop it back to the start of the one we end at.
5273 */
5274 if (del.br_blockcount > mod) {
5275 del.br_startoff += del.br_blockcount - mod;
5276 del.br_startblock += del.br_blockcount - mod;
5277 del.br_blockcount = mod;
5278 }
5279 del.br_state = XFS_EXT_UNWRITTEN;
5280 error = xfs_bmap_add_extent(ip, lastx, &cur, &del,
5281 firstblock, flist, &logflags, delta,
5282 XFS_DATA_FORK, 0);
5283 if (error)
5284 goto error0;
5285 goto nodelete;
5286 }
5287 if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) {
5288 /*
5289 * Realtime extent is lined up at the end but not
5290 * at the front. We'll get rid of full extents if
5291 * we can.
5292 */
5293 mod = mp->m_sb.sb_rextsize - mod;
5294 if (del.br_blockcount > mod) {
5295 del.br_blockcount -= mod;
5296 del.br_startoff += mod;
5297 del.br_startblock += mod;
5298 } else if ((del.br_startoff == start &&
5299 (del.br_state == XFS_EXT_UNWRITTEN ||
5300 xfs_trans_get_block_res(tp) == 0)) ||
5301 !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5302 /*
5303 * Can't make it unwritten. There isn't
5304 * a full extent here so just skip it.
5305 */
5306 ASSERT(bno >= del.br_blockcount);
5307 bno -= del.br_blockcount;
5308 if (bno < got.br_startoff) {
5309 if (--lastx >= 0)
5310 xfs_bmbt_get_all(--ep, &got);
5311 }
5312 continue;
5313 } else if (del.br_state == XFS_EXT_UNWRITTEN) {
5314 /*
5315 * This one is already unwritten.
5316 * It must have a written left neighbor.
5317 * Unwrite the killed part of that one and
5318 * try again.
5319 */
5320 ASSERT(lastx > 0);
5321 xfs_bmbt_get_all(xfs_iext_get_ext(ifp,
5322 lastx - 1), &prev);
5323 ASSERT(prev.br_state == XFS_EXT_NORM);
5324 ASSERT(!isnullstartblock(prev.br_startblock));
5325 ASSERT(del.br_startblock ==
5326 prev.br_startblock + prev.br_blockcount);
5327 if (prev.br_startoff < start) {
5328 mod = start - prev.br_startoff;
5329 prev.br_blockcount -= mod;
5330 prev.br_startblock += mod;
5331 prev.br_startoff = start;
5332 }
5333 prev.br_state = XFS_EXT_UNWRITTEN;
5334 error = xfs_bmap_add_extent(ip, lastx - 1, &cur,
5335 &prev, firstblock, flist, &logflags,
5336 delta, XFS_DATA_FORK, 0);
5337 if (error)
5338 goto error0;
5339 goto nodelete;
5340 } else {
5341 ASSERT(del.br_state == XFS_EXT_NORM);
5342 del.br_state = XFS_EXT_UNWRITTEN;
5343 error = xfs_bmap_add_extent(ip, lastx, &cur,
5344 &del, firstblock, flist, &logflags,
5345 delta, XFS_DATA_FORK, 0);
5346 if (error)
5347 goto error0;
5348 goto nodelete;
5349 }
5350 }
5351 if (wasdel) {
5352 ASSERT(startblockval(del.br_startblock) > 0);
5353 /* Update realtime/data freespace, unreserve quota */
5354 if (isrt) {
5355 xfs_filblks_t rtexts;
5356
5357 rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
5358 do_div(rtexts, mp->m_sb.sb_rextsize);
5359 xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
5360 (int64_t)rtexts, rsvd);
5361 (void)xfs_trans_reserve_quota_nblks(NULL,
5362 ip, -((long)del.br_blockcount), 0,
5363 XFS_QMOPT_RES_RTBLKS);
5364 } else {
5365 xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS,
5366 (int64_t)del.br_blockcount, rsvd);
5367 (void)xfs_trans_reserve_quota_nblks(NULL,
5368 ip, -((long)del.br_blockcount), 0,
5369 XFS_QMOPT_RES_REGBLKS);
5370 }
5371 ip->i_delayed_blks -= del.br_blockcount;
5372 if (cur)
5373 cur->bc_private.b.flags |=
5374 XFS_BTCUR_BPRV_WASDEL;
5375 } else if (cur)
5376 cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
5377 /*
5378 * If it's the case where the directory code is running
5379 * with no block reservation, and the deleted block is in
5380 * the middle of its extent, and the resulting insert
5381 * of an extent would cause transformation to btree format,
5382 * then reject it. The calling code will then swap
5383 * blocks around instead.
5384 * We have to do this now, rather than waiting for the
5385 * conversion to btree format, since the transaction
5386 * will be dirty.
5387 */
5388 if (!wasdel && xfs_trans_get_block_res(tp) == 0 &&
5389 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5390 XFS_IFORK_NEXTENTS(ip, whichfork) >= ifp->if_ext_max &&
5391 del.br_startoff > got.br_startoff &&
5392 del.br_startoff + del.br_blockcount <
5393 got.br_startoff + got.br_blockcount) {
5394 error = XFS_ERROR(ENOSPC);
5395 goto error0;
5396 }
5397 error = xfs_bmap_del_extent(ip, tp, lastx, flist, cur, &del,
5398 &tmp_logflags, delta, whichfork, rsvd);
5399 logflags |= tmp_logflags;
5400 if (error)
5401 goto error0;
5402 bno = del.br_startoff - 1;
5403 nodelete:
5404 lastx = ifp->if_lastex;
5405 /*
5406 * If not done go on to the next (previous) record.
5407 * Reset ep in case the extents array was re-alloced.
5408 */
5409 ep = xfs_iext_get_ext(ifp, lastx);
5410 if (bno != (xfs_fileoff_t)-1 && bno >= start) {
5411 if (lastx >= XFS_IFORK_NEXTENTS(ip, whichfork) ||
5412 xfs_bmbt_get_startoff(ep) > bno) {
5413 if (--lastx >= 0)
5414 ep = xfs_iext_get_ext(ifp, lastx);
5415 }
5416 if (lastx >= 0)
5417 xfs_bmbt_get_all(ep, &got);
5418 extno++;
5419 }
5420 }
5421 ifp->if_lastex = lastx;
5422 *done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0;
5423 ASSERT(ifp->if_ext_max ==
5424 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5425 /*
5426 * Convert to a btree if necessary.
5427 */
5428 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5429 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
5430 ASSERT(cur == NULL);
5431 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist,
5432 &cur, 0, &tmp_logflags, whichfork);
5433 logflags |= tmp_logflags;
5434 if (error)
5435 goto error0;
5436 }
5437 /*
5438 * transform from btree to extents, give it cur
5439 */
5440 else if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
5441 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
5442 ASSERT(cur != NULL);
5443 error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
5444 whichfork);
5445 logflags |= tmp_logflags;
5446 if (error)
5447 goto error0;
5448 }
5449 /*
5450 * transform from extents to local?
5451 */
5452 ASSERT(ifp->if_ext_max ==
5453 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5454 error = 0;
5455 if (delta && delta->xed_startoff != NULLFILEOFF) {
5456 /* A change was actually made.
5457 * Note that delta->xed_blockount is an offset at this
5458 * point and needs to be converted to a block count.
5459 */
5460 ASSERT(delta->xed_blockcount > delta->xed_startoff);
5461 delta->xed_blockcount -= delta->xed_startoff;
5462 }
5463 error0:
5464 /*
5465 * Log everything. Do this after conversion, there's no point in
5466 * logging the extent records if we've converted to btree format.
5467 */
5468 if ((logflags & xfs_ilog_fext(whichfork)) &&
5469 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5470 logflags &= ~xfs_ilog_fext(whichfork);
5471 else if ((logflags & xfs_ilog_fbroot(whichfork)) &&
5472 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5473 logflags &= ~xfs_ilog_fbroot(whichfork);
5474 /*
5475 * Log inode even in the error case, if the transaction
5476 * is dirty we'll need to shut down the filesystem.
5477 */
5478 if (logflags)
5479 xfs_trans_log_inode(tp, ip, logflags);
5480 if (cur) {
5481 if (!error) {
5482 *firstblock = cur->bc_private.b.firstblock;
5483 cur->bc_private.b.allocated = 0;
5484 }
5485 xfs_btree_del_cursor(cur,
5486 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5487 }
5488 return error;
5489 }
5490
5491 /*
5492 * returns 1 for success, 0 if we failed to map the extent.
5493 */
5494 STATIC int
5495 xfs_getbmapx_fix_eof_hole(
5496 xfs_inode_t *ip, /* xfs incore inode pointer */
5497 struct getbmapx *out, /* output structure */
5498 int prealloced, /* this is a file with
5499 * preallocated data space */
5500 __int64_t end, /* last block requested */
5501 xfs_fsblock_t startblock)
5502 {
5503 __int64_t fixlen;
5504 xfs_mount_t *mp; /* file system mount point */
5505 xfs_ifork_t *ifp; /* inode fork pointer */
5506 xfs_extnum_t lastx; /* last extent pointer */
5507 xfs_fileoff_t fileblock;
5508
5509 if (startblock == HOLESTARTBLOCK) {
5510 mp = ip->i_mount;
5511 out->bmv_block = -1;
5512 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, ip->i_size));
5513 fixlen -= out->bmv_offset;
5514 if (prealloced && out->bmv_offset + out->bmv_length == end) {
5515 /* Came to hole at EOF. Trim it. */
5516 if (fixlen <= 0)
5517 return 0;
5518 out->bmv_length = fixlen;
5519 }
5520 } else {
5521 if (startblock == DELAYSTARTBLOCK)
5522 out->bmv_block = -2;
5523 else
5524 out->bmv_block = xfs_fsb_to_db(ip, startblock);
5525 fileblock = XFS_BB_TO_FSB(ip->i_mount, out->bmv_offset);
5526 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
5527 if (xfs_iext_bno_to_ext(ifp, fileblock, &lastx) &&
5528 (lastx == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))-1))
5529 out->bmv_oflags |= BMV_OF_LAST;
5530 }
5531
5532 return 1;
5533 }
5534
5535 /*
5536 * Get inode's extents as described in bmv, and format for output.
5537 * Calls formatter to fill the user's buffer until all extents
5538 * are mapped, until the passed-in bmv->bmv_count slots have
5539 * been filled, or until the formatter short-circuits the loop,
5540 * if it is tracking filled-in extents on its own.
5541 */
5542 int /* error code */
5543 xfs_getbmap(
5544 xfs_inode_t *ip,
5545 struct getbmapx *bmv, /* user bmap structure */
5546 xfs_bmap_format_t formatter, /* format to user */
5547 void *arg) /* formatter arg */
5548 {
5549 __int64_t bmvend; /* last block requested */
5550 int error = 0; /* return value */
5551 __int64_t fixlen; /* length for -1 case */
5552 int i; /* extent number */
5553 int lock; /* lock state */
5554 xfs_bmbt_irec_t *map; /* buffer for user's data */
5555 xfs_mount_t *mp; /* file system mount point */
5556 int nex; /* # of user extents can do */
5557 int nexleft; /* # of user extents left */
5558 int subnex; /* # of bmapi's can do */
5559 int nmap; /* number of map entries */
5560 struct getbmapx *out; /* output structure */
5561 int whichfork; /* data or attr fork */
5562 int prealloced; /* this is a file with
5563 * preallocated data space */
5564 int iflags; /* interface flags */
5565 int bmapi_flags; /* flags for xfs_bmapi */
5566 int cur_ext = 0;
5567
5568 mp = ip->i_mount;
5569 iflags = bmv->bmv_iflags;
5570 whichfork = iflags & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
5571
5572 if (whichfork == XFS_ATTR_FORK) {
5573 if (XFS_IFORK_Q(ip)) {
5574 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS &&
5575 ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE &&
5576 ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)
5577 return XFS_ERROR(EINVAL);
5578 } else if (unlikely(
5579 ip->i_d.di_aformat != 0 &&
5580 ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) {
5581 XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW,
5582 ip->i_mount);
5583 return XFS_ERROR(EFSCORRUPTED);
5584 }
5585
5586 prealloced = 0;
5587 fixlen = 1LL << 32;
5588 } else {
5589 /*
5590 * If the BMV_IF_NO_DMAPI_READ interface bit specified, do
5591 * not generate a DMAPI read event. Otherwise, if the
5592 * DM_EVENT_READ bit is set for the file, generate a read
5593 * event in order that the DMAPI application may do its thing
5594 * before we return the extents. Usually this means restoring
5595 * user file data to regions of the file that look like holes.
5596 *
5597 * The "old behavior" (from XFS_IOC_GETBMAP) is to not specify
5598 * BMV_IF_NO_DMAPI_READ so that read events are generated.
5599 * If this were not true, callers of ioctl(XFS_IOC_GETBMAP)
5600 * could misinterpret holes in a DMAPI file as true holes,
5601 * when in fact they may represent offline user data.
5602 */
5603 if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) &&
5604 !(iflags & BMV_IF_NO_DMAPI_READ)) {
5605 error = XFS_SEND_DATA(mp, DM_EVENT_READ, ip,
5606 0, 0, 0, NULL);
5607 if (error)
5608 return XFS_ERROR(error);
5609 }
5610
5611 if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
5612 ip->i_d.di_format != XFS_DINODE_FMT_BTREE &&
5613 ip->i_d.di_format != XFS_DINODE_FMT_LOCAL)
5614 return XFS_ERROR(EINVAL);
5615
5616 if (xfs_get_extsz_hint(ip) ||
5617 ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){
5618 prealloced = 1;
5619 fixlen = XFS_MAXIOFFSET(mp);
5620 } else {
5621 prealloced = 0;
5622 fixlen = ip->i_size;
5623 }
5624 }
5625
5626 if (bmv->bmv_length == -1) {
5627 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen));
5628 bmv->bmv_length =
5629 max_t(__int64_t, fixlen - bmv->bmv_offset, 0);
5630 } else if (bmv->bmv_length == 0) {
5631 bmv->bmv_entries = 0;
5632 return 0;
5633 } else if (bmv->bmv_length < 0) {
5634 return XFS_ERROR(EINVAL);
5635 }
5636
5637 nex = bmv->bmv_count - 1;
5638 if (nex <= 0)
5639 return XFS_ERROR(EINVAL);
5640 bmvend = bmv->bmv_offset + bmv->bmv_length;
5641
5642
5643 if (bmv->bmv_count > ULONG_MAX / sizeof(struct getbmapx))
5644 return XFS_ERROR(ENOMEM);
5645 out = kmem_zalloc(bmv->bmv_count * sizeof(struct getbmapx), KM_MAYFAIL);
5646 if (!out)
5647 return XFS_ERROR(ENOMEM);
5648
5649 xfs_ilock(ip, XFS_IOLOCK_SHARED);
5650 if (whichfork == XFS_DATA_FORK && !(iflags & BMV_IF_DELALLOC)) {
5651 if (ip->i_delayed_blks || ip->i_size > ip->i_d.di_size) {
5652 error = xfs_flush_pages(ip, 0, -1, 0, FI_REMAPF);
5653 if (error)
5654 goto out_unlock_iolock;
5655 }
5656
5657 ASSERT(ip->i_delayed_blks == 0);
5658 }
5659
5660 lock = xfs_ilock_map_shared(ip);
5661
5662 /*
5663 * Don't let nex be bigger than the number of extents
5664 * we can have assuming alternating holes and real extents.
5665 */
5666 if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1)
5667 nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1;
5668
5669 bmapi_flags = xfs_bmapi_aflag(whichfork);
5670 if (!(iflags & BMV_IF_PREALLOC))
5671 bmapi_flags |= XFS_BMAPI_IGSTATE;
5672
5673 /*
5674 * Allocate enough space to handle "subnex" maps at a time.
5675 */
5676 error = ENOMEM;
5677 subnex = 16;
5678 map = kmem_alloc(subnex * sizeof(*map), KM_MAYFAIL | KM_NOFS);
5679 if (!map)
5680 goto out_unlock_ilock;
5681
5682 bmv->bmv_entries = 0;
5683
5684 if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0 &&
5685 (whichfork == XFS_ATTR_FORK || !(iflags & BMV_IF_DELALLOC))) {
5686 error = 0;
5687 goto out_free_map;
5688 }
5689
5690 nexleft = nex;
5691
5692 do {
5693 nmap = (nexleft > subnex) ? subnex : nexleft;
5694 error = xfs_bmapi(NULL, ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
5695 XFS_BB_TO_FSB(mp, bmv->bmv_length),
5696 bmapi_flags, NULL, 0, map, &nmap,
5697 NULL, NULL);
5698 if (error)
5699 goto out_free_map;
5700 ASSERT(nmap <= subnex);
5701
5702 for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
5703 out[cur_ext].bmv_oflags = 0;
5704 if (map[i].br_state == XFS_EXT_UNWRITTEN)
5705 out[cur_ext].bmv_oflags |= BMV_OF_PREALLOC;
5706 else if (map[i].br_startblock == DELAYSTARTBLOCK)
5707 out[cur_ext].bmv_oflags |= BMV_OF_DELALLOC;
5708 out[cur_ext].bmv_offset =
5709 XFS_FSB_TO_BB(mp, map[i].br_startoff);
5710 out[cur_ext].bmv_length =
5711 XFS_FSB_TO_BB(mp, map[i].br_blockcount);
5712 out[cur_ext].bmv_unused1 = 0;
5713 out[cur_ext].bmv_unused2 = 0;
5714 ASSERT(((iflags & BMV_IF_DELALLOC) != 0) ||
5715 (map[i].br_startblock != DELAYSTARTBLOCK));
5716 if (map[i].br_startblock == HOLESTARTBLOCK &&
5717 whichfork == XFS_ATTR_FORK) {
5718 /* came to the end of attribute fork */
5719 out[cur_ext].bmv_oflags |= BMV_OF_LAST;
5720 goto out_free_map;
5721 }
5722
5723 if (!xfs_getbmapx_fix_eof_hole(ip, &out[cur_ext],
5724 prealloced, bmvend,
5725 map[i].br_startblock))
5726 goto out_free_map;
5727
5728 nexleft--;
5729 bmv->bmv_offset =
5730 out[cur_ext].bmv_offset +
5731 out[cur_ext].bmv_length;
5732 bmv->bmv_length =
5733 max_t(__int64_t, 0, bmvend - bmv->bmv_offset);
5734 bmv->bmv_entries++;
5735 cur_ext++;
5736 }
5737 } while (nmap && nexleft && bmv->bmv_length);
5738
5739 out_free_map:
5740 kmem_free(map);
5741 out_unlock_ilock:
5742 xfs_iunlock_map_shared(ip, lock);
5743 out_unlock_iolock:
5744 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
5745
5746 for (i = 0; i < cur_ext; i++) {
5747 int full = 0; /* user array is full */
5748
5749 /* format results & advance arg */
5750 error = formatter(&arg, &out[i], &full);
5751 if (error || full)
5752 break;
5753 }
5754
5755 kmem_free(out);
5756 return error;
5757 }
5758
5759 /*
5760 * Check the last inode extent to determine whether this allocation will result
5761 * in blocks being allocated at the end of the file. When we allocate new data
5762 * blocks at the end of the file which do not start at the previous data block,
5763 * we will try to align the new blocks at stripe unit boundaries.
5764 */
5765 STATIC int /* error */
5766 xfs_bmap_isaeof(
5767 xfs_inode_t *ip, /* incore inode pointer */
5768 xfs_fileoff_t off, /* file offset in fsblocks */
5769 int whichfork, /* data or attribute fork */
5770 char *aeof) /* return value */
5771 {
5772 int error; /* error return value */
5773 xfs_ifork_t *ifp; /* inode fork pointer */
5774 xfs_bmbt_rec_host_t *lastrec; /* extent record pointer */
5775 xfs_extnum_t nextents; /* number of file extents */
5776 xfs_bmbt_irec_t s; /* expanded extent record */
5777
5778 ASSERT(whichfork == XFS_DATA_FORK);
5779 ifp = XFS_IFORK_PTR(ip, whichfork);
5780 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5781 (error = xfs_iread_extents(NULL, ip, whichfork)))
5782 return error;
5783 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5784 if (nextents == 0) {
5785 *aeof = 1;
5786 return 0;
5787 }
5788 /*
5789 * Go to the last extent
5790 */
5791 lastrec = xfs_iext_get_ext(ifp, nextents - 1);
5792 xfs_bmbt_get_all(lastrec, &s);
5793 /*
5794 * Check we are allocating in the last extent (for delayed allocations)
5795 * or past the last extent for non-delayed allocations.
5796 */
5797 *aeof = (off >= s.br_startoff &&
5798 off < s.br_startoff + s.br_blockcount &&
5799 isnullstartblock(s.br_startblock)) ||
5800 off >= s.br_startoff + s.br_blockcount;
5801 return 0;
5802 }
5803
5804 /*
5805 * Check if the endoff is outside the last extent. If so the caller will grow
5806 * the allocation to a stripe unit boundary.
5807 */
5808 int /* error */
5809 xfs_bmap_eof(
5810 xfs_inode_t *ip, /* incore inode pointer */
5811 xfs_fileoff_t endoff, /* file offset in fsblocks */
5812 int whichfork, /* data or attribute fork */
5813 int *eof) /* result value */
5814 {
5815 xfs_fsblock_t blockcount; /* extent block count */
5816 int error; /* error return value */
5817 xfs_ifork_t *ifp; /* inode fork pointer */
5818 xfs_bmbt_rec_host_t *lastrec; /* extent record pointer */
5819 xfs_extnum_t nextents; /* number of file extents */
5820 xfs_fileoff_t startoff; /* extent starting file offset */
5821
5822 ASSERT(whichfork == XFS_DATA_FORK);
5823 ifp = XFS_IFORK_PTR(ip, whichfork);
5824 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5825 (error = xfs_iread_extents(NULL, ip, whichfork)))
5826 return error;
5827 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5828 if (nextents == 0) {
5829 *eof = 1;
5830 return 0;
5831 }
5832 /*
5833 * Go to the last extent
5834 */
5835 lastrec = xfs_iext_get_ext(ifp, nextents - 1);
5836 startoff = xfs_bmbt_get_startoff(lastrec);
5837 blockcount = xfs_bmbt_get_blockcount(lastrec);
5838 *eof = endoff >= startoff + blockcount;
5839 return 0;
5840 }
5841
5842 #ifdef DEBUG
5843 STATIC
5844 xfs_buf_t *
5845 xfs_bmap_get_bp(
5846 xfs_btree_cur_t *cur,
5847 xfs_fsblock_t bno)
5848 {
5849 int i;
5850 xfs_buf_t *bp;
5851
5852 if (!cur)
5853 return(NULL);
5854
5855 bp = NULL;
5856 for(i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
5857 bp = cur->bc_bufs[i];
5858 if (!bp) break;
5859 if (XFS_BUF_ADDR(bp) == bno)
5860 break; /* Found it */
5861 }
5862 if (i == XFS_BTREE_MAXLEVELS)
5863 bp = NULL;
5864
5865 if (!bp) { /* Chase down all the log items to see if the bp is there */
5866 xfs_log_item_chunk_t *licp;
5867 xfs_trans_t *tp;
5868
5869 tp = cur->bc_tp;
5870 licp = &tp->t_items;
5871 while (!bp && licp != NULL) {
5872 if (xfs_lic_are_all_free(licp)) {
5873 licp = licp->lic_next;
5874 continue;
5875 }
5876 for (i = 0; i < licp->lic_unused; i++) {
5877 xfs_log_item_desc_t *lidp;
5878 xfs_log_item_t *lip;
5879 xfs_buf_log_item_t *bip;
5880 xfs_buf_t *lbp;
5881
5882 if (xfs_lic_isfree(licp, i)) {
5883 continue;
5884 }
5885
5886 lidp = xfs_lic_slot(licp, i);
5887 lip = lidp->lid_item;
5888 if (lip->li_type != XFS_LI_BUF)
5889 continue;
5890
5891 bip = (xfs_buf_log_item_t *)lip;
5892 lbp = bip->bli_buf;
5893
5894 if (XFS_BUF_ADDR(lbp) == bno) {
5895 bp = lbp;
5896 break; /* Found it */
5897 }
5898 }
5899 licp = licp->lic_next;
5900 }
5901 }
5902 return(bp);
5903 }
5904
5905 STATIC void
5906 xfs_check_block(
5907 struct xfs_btree_block *block,
5908 xfs_mount_t *mp,
5909 int root,
5910 short sz)
5911 {
5912 int i, j, dmxr;
5913 __be64 *pp, *thispa; /* pointer to block address */
5914 xfs_bmbt_key_t *prevp, *keyp;
5915
5916 ASSERT(be16_to_cpu(block->bb_level) > 0);
5917
5918 prevp = NULL;
5919 for( i = 1; i <= xfs_btree_get_numrecs(block); i++) {
5920 dmxr = mp->m_bmap_dmxr[0];
5921 keyp = XFS_BMBT_KEY_ADDR(mp, block, i);
5922
5923 if (prevp) {
5924 ASSERT(be64_to_cpu(prevp->br_startoff) <
5925 be64_to_cpu(keyp->br_startoff));
5926 }
5927 prevp = keyp;
5928
5929 /*
5930 * Compare the block numbers to see if there are dups.
5931 */
5932 if (root)
5933 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, i, sz);
5934 else
5935 pp = XFS_BMBT_PTR_ADDR(mp, block, i, dmxr);
5936
5937 for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
5938 if (root)
5939 thispa = XFS_BMAP_BROOT_PTR_ADDR(mp, block, j, sz);
5940 else
5941 thispa = XFS_BMBT_PTR_ADDR(mp, block, j, dmxr);
5942 if (*thispa == *pp) {
5943 cmn_err(CE_WARN, "%s: thispa(%d) == pp(%d) %Ld",
5944 __func__, j, i,
5945 (unsigned long long)be64_to_cpu(*thispa));
5946 panic("%s: ptrs are equal in node\n",
5947 __func__);
5948 }
5949 }
5950 }
5951 }
5952
5953 /*
5954 * Check that the extents for the inode ip are in the right order in all
5955 * btree leaves.
5956 */
5957
5958 STATIC void
5959 xfs_bmap_check_leaf_extents(
5960 xfs_btree_cur_t *cur, /* btree cursor or null */
5961 xfs_inode_t *ip, /* incore inode pointer */
5962 int whichfork) /* data or attr fork */
5963 {
5964 struct xfs_btree_block *block; /* current btree block */
5965 xfs_fsblock_t bno; /* block # of "block" */
5966 xfs_buf_t *bp; /* buffer for "block" */
5967 int error; /* error return value */
5968 xfs_extnum_t i=0, j; /* index into the extents list */
5969 xfs_ifork_t *ifp; /* fork structure */
5970 int level; /* btree level, for checking */
5971 xfs_mount_t *mp; /* file system mount structure */
5972 __be64 *pp; /* pointer to block address */
5973 xfs_bmbt_rec_t *ep; /* pointer to current extent */
5974 xfs_bmbt_rec_t last = {0, 0}; /* last extent in prev block */
5975 xfs_bmbt_rec_t *nextp; /* pointer to next extent */
5976 int bp_release = 0;
5977
5978 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
5979 return;
5980 }
5981
5982 bno = NULLFSBLOCK;
5983 mp = ip->i_mount;
5984 ifp = XFS_IFORK_PTR(ip, whichfork);
5985 block = ifp->if_broot;
5986 /*
5987 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
5988 */
5989 level = be16_to_cpu(block->bb_level);
5990 ASSERT(level > 0);
5991 xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
5992 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
5993 bno = be64_to_cpu(*pp);
5994
5995 ASSERT(bno != NULLDFSBNO);
5996 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
5997 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
5998
5999 /*
6000 * Go down the tree until leaf level is reached, following the first
6001 * pointer (leftmost) at each level.
6002 */
6003 while (level-- > 0) {
6004 /* See if buf is in cur first */
6005 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
6006 if (bp) {
6007 bp_release = 0;
6008 } else {
6009 bp_release = 1;
6010 }
6011 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
6012 XFS_BMAP_BTREE_REF)))
6013 goto error_norelse;
6014 block = XFS_BUF_TO_BLOCK(bp);
6015 XFS_WANT_CORRUPTED_GOTO(
6016 xfs_bmap_sanity_check(mp, bp, level),
6017 error0);
6018 if (level == 0)
6019 break;
6020
6021 /*
6022 * Check this block for basic sanity (increasing keys and
6023 * no duplicate blocks).
6024 */
6025
6026 xfs_check_block(block, mp, 0, 0);
6027 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
6028 bno = be64_to_cpu(*pp);
6029 XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
6030 if (bp_release) {
6031 bp_release = 0;
6032 xfs_trans_brelse(NULL, bp);
6033 }
6034 }
6035
6036 /*
6037 * Here with bp and block set to the leftmost leaf node in the tree.
6038 */
6039 i = 0;
6040
6041 /*
6042 * Loop over all leaf nodes checking that all extents are in the right order.
6043 */
6044 for (;;) {
6045 xfs_fsblock_t nextbno;
6046 xfs_extnum_t num_recs;
6047
6048
6049 num_recs = xfs_btree_get_numrecs(block);
6050
6051 /*
6052 * Read-ahead the next leaf block, if any.
6053 */
6054
6055 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
6056
6057 /*
6058 * Check all the extents to make sure they are OK.
6059 * If we had a previous block, the last entry should
6060 * conform with the first entry in this one.
6061 */
6062
6063 ep = XFS_BMBT_REC_ADDR(mp, block, 1);
6064 if (i) {
6065 ASSERT(xfs_bmbt_disk_get_startoff(&last) +
6066 xfs_bmbt_disk_get_blockcount(&last) <=
6067 xfs_bmbt_disk_get_startoff(ep));
6068 }
6069 for (j = 1; j < num_recs; j++) {
6070 nextp = XFS_BMBT_REC_ADDR(mp, block, j + 1);
6071 ASSERT(xfs_bmbt_disk_get_startoff(ep) +
6072 xfs_bmbt_disk_get_blockcount(ep) <=
6073 xfs_bmbt_disk_get_startoff(nextp));
6074 ep = nextp;
6075 }
6076
6077 last = *ep;
6078 i += num_recs;
6079 if (bp_release) {
6080 bp_release = 0;
6081 xfs_trans_brelse(NULL, bp);
6082 }
6083 bno = nextbno;
6084 /*
6085 * If we've reached the end, stop.
6086 */
6087 if (bno == NULLFSBLOCK)
6088 break;
6089
6090 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
6091 if (bp) {
6092 bp_release = 0;
6093 } else {
6094 bp_release = 1;
6095 }
6096 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
6097 XFS_BMAP_BTREE_REF)))
6098 goto error_norelse;
6099 block = XFS_BUF_TO_BLOCK(bp);
6100 }
6101 if (bp_release) {
6102 bp_release = 0;
6103 xfs_trans_brelse(NULL, bp);
6104 }
6105 return;
6106
6107 error0:
6108 cmn_err(CE_WARN, "%s: at error0", __func__);
6109 if (bp_release)
6110 xfs_trans_brelse(NULL, bp);
6111 error_norelse:
6112 cmn_err(CE_WARN, "%s: BAD after btree leaves for %d extents",
6113 __func__, i);
6114 panic("%s: CORRUPTED BTREE OR SOMETHING", __func__);
6115 return;
6116 }
6117 #endif
6118
6119 /*
6120 * Count fsblocks of the given fork.
6121 */
6122 int /* error */
6123 xfs_bmap_count_blocks(
6124 xfs_trans_t *tp, /* transaction pointer */
6125 xfs_inode_t *ip, /* incore inode */
6126 int whichfork, /* data or attr fork */
6127 int *count) /* out: count of blocks */
6128 {
6129 struct xfs_btree_block *block; /* current btree block */
6130 xfs_fsblock_t bno; /* block # of "block" */
6131 xfs_ifork_t *ifp; /* fork structure */
6132 int level; /* btree level, for checking */
6133 xfs_mount_t *mp; /* file system mount structure */
6134 __be64 *pp; /* pointer to block address */
6135
6136 bno = NULLFSBLOCK;
6137 mp = ip->i_mount;
6138 ifp = XFS_IFORK_PTR(ip, whichfork);
6139 if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) {
6140 xfs_bmap_count_leaves(ifp, 0,
6141 ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t),
6142 count);
6143 return 0;
6144 }
6145
6146 /*
6147 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
6148 */
6149 block = ifp->if_broot;
6150 level = be16_to_cpu(block->bb_level);
6151 ASSERT(level > 0);
6152 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
6153 bno = be64_to_cpu(*pp);
6154 ASSERT(bno != NULLDFSBNO);
6155 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
6156 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
6157
6158 if (unlikely(xfs_bmap_count_tree(mp, tp, ifp, bno, level, count) < 0)) {
6159 XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW,
6160 mp);
6161 return XFS_ERROR(EFSCORRUPTED);
6162 }
6163
6164 return 0;
6165 }
6166
6167 /*
6168 * Recursively walks each level of a btree
6169 * to count total fsblocks is use.
6170 */
6171 STATIC int /* error */
6172 xfs_bmap_count_tree(
6173 xfs_mount_t *mp, /* file system mount point */
6174 xfs_trans_t *tp, /* transaction pointer */
6175 xfs_ifork_t *ifp, /* inode fork pointer */
6176 xfs_fsblock_t blockno, /* file system block number */
6177 int levelin, /* level in btree */
6178 int *count) /* Count of blocks */
6179 {
6180 int error;
6181 xfs_buf_t *bp, *nbp;
6182 int level = levelin;
6183 __be64 *pp;
6184 xfs_fsblock_t bno = blockno;
6185 xfs_fsblock_t nextbno;
6186 struct xfs_btree_block *block, *nextblock;
6187 int numrecs;
6188
6189 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF)))
6190 return error;
6191 *count += 1;
6192 block = XFS_BUF_TO_BLOCK(bp);
6193
6194 if (--level) {
6195 /* Not at node above leaves, count this level of nodes */
6196 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
6197 while (nextbno != NULLFSBLOCK) {
6198 if ((error = xfs_btree_read_bufl(mp, tp, nextbno,
6199 0, &nbp, XFS_BMAP_BTREE_REF)))
6200 return error;
6201 *count += 1;
6202 nextblock = XFS_BUF_TO_BLOCK(nbp);
6203 nextbno = be64_to_cpu(nextblock->bb_u.l.bb_rightsib);
6204 xfs_trans_brelse(tp, nbp);
6205 }
6206
6207 /* Dive to the next level */
6208 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
6209 bno = be64_to_cpu(*pp);
6210 if (unlikely((error =
6211 xfs_bmap_count_tree(mp, tp, ifp, bno, level, count)) < 0)) {
6212 xfs_trans_brelse(tp, bp);
6213 XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
6214 XFS_ERRLEVEL_LOW, mp);
6215 return XFS_ERROR(EFSCORRUPTED);
6216 }
6217 xfs_trans_brelse(tp, bp);
6218 } else {
6219 /* count all level 1 nodes and their leaves */
6220 for (;;) {
6221 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
6222 numrecs = be16_to_cpu(block->bb_numrecs);
6223 xfs_bmap_disk_count_leaves(mp, block, numrecs, count);
6224 xfs_trans_brelse(tp, bp);
6225 if (nextbno == NULLFSBLOCK)
6226 break;
6227 bno = nextbno;
6228 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
6229 XFS_BMAP_BTREE_REF)))
6230 return error;
6231 *count += 1;
6232 block = XFS_BUF_TO_BLOCK(bp);
6233 }
6234 }
6235 return 0;
6236 }
6237
6238 /*
6239 * Count leaf blocks given a range of extent records.
6240 */
6241 STATIC void
6242 xfs_bmap_count_leaves(
6243 xfs_ifork_t *ifp,
6244 xfs_extnum_t idx,
6245 int numrecs,
6246 int *count)
6247 {
6248 int b;
6249
6250 for (b = 0; b < numrecs; b++) {
6251 xfs_bmbt_rec_host_t *frp = xfs_iext_get_ext(ifp, idx + b);
6252 *count += xfs_bmbt_get_blockcount(frp);
6253 }
6254 }
6255
6256 /*
6257 * Count leaf blocks given a range of extent records originally
6258 * in btree format.
6259 */
6260 STATIC void
6261 xfs_bmap_disk_count_leaves(
6262 struct xfs_mount *mp,
6263 struct xfs_btree_block *block,
6264 int numrecs,
6265 int *count)
6266 {
6267 int b;
6268 xfs_bmbt_rec_t *frp;
6269
6270 for (b = 1; b <= numrecs; b++) {
6271 frp = XFS_BMBT_REC_ADDR(mp, block, b);
6272 *count += xfs_bmbt_disk_get_blockcount(frp);
6273 }
6274 }
linux 2.6 git repository for openrd