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[PATCH] e1000: Added functions declarations
[linux-2.6/mini2440.git] / fs / xfs / xfs_bmap.c
blob70625e577c70b7421ad18a7e180f02962c679952
1 /*
2 * Copyright (c) 2000-2005 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_dir.h"
28 #include "xfs_dir2.h"
29 #include "xfs_da_btree.h"
30 #include "xfs_bmap_btree.h"
31 #include "xfs_alloc_btree.h"
32 #include "xfs_ialloc_btree.h"
33 #include "xfs_dir_sf.h"
34 #include "xfs_dir2_sf.h"
35 #include "xfs_attr_sf.h"
36 #include "xfs_dinode.h"
37 #include "xfs_inode.h"
38 #include "xfs_btree.h"
39 #include "xfs_dmapi.h"
40 #include "xfs_mount.h"
41 #include "xfs_ialloc.h"
42 #include "xfs_itable.h"
43 #include "xfs_inode_item.h"
44 #include "xfs_extfree_item.h"
45 #include "xfs_alloc.h"
46 #include "xfs_bmap.h"
47 #include "xfs_rtalloc.h"
48 #include "xfs_error.h"
49 #include "xfs_dir_leaf.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
56
57 #ifdef DEBUG
58 STATIC void
59 xfs_bmap_check_leaf_extents(xfs_btree_cur_t *cur, xfs_inode_t *ip, int whichfork);
60 #endif
61
62 kmem_zone_t *xfs_bmap_free_item_zone;
63
64 /*
65 * Prototypes for internal bmap routines.
66 */
67
68
69 /*
70 * Called from xfs_bmap_add_attrfork to handle extents format files.
71 */
72 STATIC int /* error */
73 xfs_bmap_add_attrfork_extents(
74 xfs_trans_t *tp, /* transaction pointer */
75 xfs_inode_t *ip, /* incore inode pointer */
76 xfs_fsblock_t *firstblock, /* first block allocated */
77 xfs_bmap_free_t *flist, /* blocks to free at commit */
78 int *flags); /* inode logging flags */
79
80 /*
81 * Called from xfs_bmap_add_attrfork to handle local format files.
82 */
83 STATIC int /* error */
84 xfs_bmap_add_attrfork_local(
85 xfs_trans_t *tp, /* transaction pointer */
86 xfs_inode_t *ip, /* incore inode pointer */
87 xfs_fsblock_t *firstblock, /* first block allocated */
88 xfs_bmap_free_t *flist, /* blocks to free at commit */
89 int *flags); /* inode logging flags */
90
91 /*
92 * Called by xfs_bmapi to update extent list structure and the btree
93 * after allocating space (or doing a delayed allocation).
94 */
95 STATIC int /* error */
96 xfs_bmap_add_extent(
97 xfs_inode_t *ip, /* incore inode pointer */
98 xfs_extnum_t idx, /* extent number to update/insert */
99 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
100 xfs_bmbt_irec_t *new, /* new data to put in extent list */
101 xfs_fsblock_t *first, /* pointer to firstblock variable */
102 xfs_bmap_free_t *flist, /* list of extents to be freed */
103 int *logflagsp, /* inode logging flags */
104 int whichfork, /* data or attr fork */
105 int rsvd); /* OK to allocate reserved blocks */
106
107 /*
108 * Called by xfs_bmap_add_extent to handle cases converting a delayed
109 * allocation to a real allocation.
110 */
111 STATIC int /* error */
112 xfs_bmap_add_extent_delay_real(
113 xfs_inode_t *ip, /* incore inode pointer */
114 xfs_extnum_t idx, /* extent number to update/insert */
115 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
116 xfs_bmbt_irec_t *new, /* new data to put in extent list */
117 xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
118 xfs_fsblock_t *first, /* pointer to firstblock variable */
119 xfs_bmap_free_t *flist, /* list of extents to be freed */
120 int *logflagsp, /* inode logging flags */
121 int rsvd); /* OK to allocate reserved blocks */
122
123 /*
124 * Called by xfs_bmap_add_extent to handle cases converting a hole
125 * to a delayed allocation.
126 */
127 STATIC int /* error */
128 xfs_bmap_add_extent_hole_delay(
129 xfs_inode_t *ip, /* incore inode pointer */
130 xfs_extnum_t idx, /* extent number to update/insert */
131 xfs_btree_cur_t *cur, /* if null, not a btree */
132 xfs_bmbt_irec_t *new, /* new data to put in extent list */
133 int *logflagsp,/* inode logging flags */
134 int rsvd); /* OK to allocate reserved blocks */
135
136 /*
137 * Called by xfs_bmap_add_extent to handle cases converting a hole
138 * to a real allocation.
139 */
140 STATIC int /* error */
141 xfs_bmap_add_extent_hole_real(
142 xfs_inode_t *ip, /* incore inode pointer */
143 xfs_extnum_t idx, /* extent number to update/insert */
144 xfs_btree_cur_t *cur, /* if null, not a btree */
145 xfs_bmbt_irec_t *new, /* new data to put in extent list */
146 int *logflagsp, /* inode logging flags */
147 int whichfork); /* data or attr fork */
148
149 /*
150 * Called by xfs_bmap_add_extent to handle cases converting an unwritten
151 * allocation to a real allocation or vice versa.
152 */
153 STATIC int /* error */
154 xfs_bmap_add_extent_unwritten_real(
155 xfs_inode_t *ip, /* incore inode pointer */
156 xfs_extnum_t idx, /* extent number to update/insert */
157 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
158 xfs_bmbt_irec_t *new, /* new data to put in extent list */
159 int *logflagsp); /* inode logging flags */
160
161 /*
162 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
163 * It figures out where to ask the underlying allocator to put the new extent.
164 */
165 STATIC int /* error */
166 xfs_bmap_alloc(
167 xfs_bmalloca_t *ap); /* bmap alloc argument struct */
168
169 /*
170 * Transform a btree format file with only one leaf node, where the
171 * extents list will fit in the inode, into an extents format file.
172 * Since the extent list is already in-core, all we have to do is
173 * give up the space for the btree root and pitch the leaf block.
174 */
175 STATIC int /* error */
176 xfs_bmap_btree_to_extents(
177 xfs_trans_t *tp, /* transaction pointer */
178 xfs_inode_t *ip, /* incore inode pointer */
179 xfs_btree_cur_t *cur, /* btree cursor */
180 int *logflagsp, /* inode logging flags */
181 int whichfork); /* data or attr fork */
182
183 #ifdef DEBUG
184 /*
185 * Check that the extents list for the inode ip is in the right order.
186 */
187 STATIC void
188 xfs_bmap_check_extents(
189 xfs_inode_t *ip, /* incore inode pointer */
190 int whichfork); /* data or attr fork */
191 #endif
192
193 /*
194 * Called by xfs_bmapi to update extent list structure and the btree
195 * after removing space (or undoing a delayed allocation).
196 */
197 STATIC int /* error */
198 xfs_bmap_del_extent(
199 xfs_inode_t *ip, /* incore inode pointer */
200 xfs_trans_t *tp, /* current trans pointer */
201 xfs_extnum_t idx, /* extent number to update/insert */
202 xfs_bmap_free_t *flist, /* list of extents to be freed */
203 xfs_btree_cur_t *cur, /* if null, not a btree */
204 xfs_bmbt_irec_t *new, /* new data to put in extent list */
205 int *logflagsp,/* inode logging flags */
206 int whichfork, /* data or attr fork */
207 int rsvd); /* OK to allocate reserved blocks */
208
209 /*
210 * Remove the entry "free" from the free item list. Prev points to the
211 * previous entry, unless "free" is the head of the list.
212 */
213 STATIC void
214 xfs_bmap_del_free(
215 xfs_bmap_free_t *flist, /* free item list header */
216 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
217 xfs_bmap_free_item_t *free); /* list item to be freed */
218
219 /*
220 * Remove count entries from the extents array for inode "ip", starting
221 * at index "idx". Copies the remaining items down over the deleted ones,
222 * and gives back the excess memory.
223 */
224 STATIC void
225 xfs_bmap_delete_exlist(
226 xfs_inode_t *ip, /* incode inode pointer */
227 xfs_extnum_t idx, /* starting delete index */
228 xfs_extnum_t count, /* count of items to delete */
229 int whichfork); /* data or attr fork */
230
231 /*
232 * Convert an extents-format file into a btree-format file.
233 * The new file will have a root block (in the inode) and a single child block.
234 */
235 STATIC int /* error */
236 xfs_bmap_extents_to_btree(
237 xfs_trans_t *tp, /* transaction pointer */
238 xfs_inode_t *ip, /* incore inode pointer */
239 xfs_fsblock_t *firstblock, /* first-block-allocated */
240 xfs_bmap_free_t *flist, /* blocks freed in xaction */
241 xfs_btree_cur_t **curp, /* cursor returned to caller */
242 int wasdel, /* converting a delayed alloc */
243 int *logflagsp, /* inode logging flags */
244 int whichfork); /* data or attr fork */
245
246 /*
247 * Insert new item(s) in the extent list for inode "ip".
248 * Count new items are inserted at offset idx.
249 */
250 STATIC void
251 xfs_bmap_insert_exlist(
252 xfs_inode_t *ip, /* incore inode pointer */
253 xfs_extnum_t idx, /* starting index of new items */
254 xfs_extnum_t count, /* number of inserted items */
255 xfs_bmbt_irec_t *new, /* items to insert */
256 int whichfork); /* data or attr fork */
257
258 /*
259 * Convert a local file to an extents file.
260 * This code is sort of bogus, since the file data needs to get
261 * logged so it won't be lost. The bmap-level manipulations are ok, though.
262 */
263 STATIC int /* error */
264 xfs_bmap_local_to_extents(
265 xfs_trans_t *tp, /* transaction pointer */
266 xfs_inode_t *ip, /* incore inode pointer */
267 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
268 xfs_extlen_t total, /* total blocks needed by transaction */
269 int *logflagsp, /* inode logging flags */
270 int whichfork); /* data or attr fork */
271
272 /*
273 * Search the extents list for the inode, for the extent containing bno.
274 * If bno lies in a hole, point to the next entry. If bno lies past eof,
275 * *eofp will be set, and *prevp will contain the last entry (null if none).
276 * Else, *lastxp will be set to the index of the found
277 * entry; *gotp will contain the entry.
278 */
279 STATIC xfs_bmbt_rec_t * /* pointer to found extent entry */
280 xfs_bmap_search_extents(
281 xfs_inode_t *ip, /* incore inode pointer */
282 xfs_fileoff_t bno, /* block number searched for */
283 int whichfork, /* data or attr fork */
284 int *eofp, /* out: end of file found */
285 xfs_extnum_t *lastxp, /* out: last extent index */
286 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
287 xfs_bmbt_irec_t *prevp); /* out: previous extent entry found */
288
289 /*
290 * Check the last inode extent to determine whether this allocation will result
291 * in blocks being allocated at the end of the file. When we allocate new data
292 * blocks at the end of the file which do not start at the previous data block,
293 * we will try to align the new blocks at stripe unit boundaries.
294 */
295 STATIC int /* error */
296 xfs_bmap_isaeof(
297 xfs_inode_t *ip, /* incore inode pointer */
298 xfs_fileoff_t off, /* file offset in fsblocks */
299 int whichfork, /* data or attribute fork */
300 char *aeof); /* return value */
301
302 #ifdef XFS_BMAP_TRACE
303 /*
304 * Add a bmap trace buffer entry. Base routine for the others.
305 */
306 STATIC void
307 xfs_bmap_trace_addentry(
308 int opcode, /* operation */
309 char *fname, /* function name */
310 char *desc, /* operation description */
311 xfs_inode_t *ip, /* incore inode pointer */
312 xfs_extnum_t idx, /* index of entry(ies) */
313 xfs_extnum_t cnt, /* count of entries, 1 or 2 */
314 xfs_bmbt_rec_t *r1, /* first record */
315 xfs_bmbt_rec_t *r2, /* second record or null */
316 int whichfork); /* data or attr fork */
317
318 /*
319 * Add bmap trace entry prior to a call to xfs_bmap_delete_exlist.
320 */
321 STATIC void
322 xfs_bmap_trace_delete(
323 char *fname, /* function name */
324 char *desc, /* operation description */
325 xfs_inode_t *ip, /* incore inode pointer */
326 xfs_extnum_t idx, /* index of entry(entries) deleted */
327 xfs_extnum_t cnt, /* count of entries deleted, 1 or 2 */
328 int whichfork); /* data or attr fork */
329
330 /*
331 * Add bmap trace entry prior to a call to xfs_bmap_insert_exlist, or
332 * reading in the extents list from the disk (in the btree).
333 */
334 STATIC void
335 xfs_bmap_trace_insert(
336 char *fname, /* function name */
337 char *desc, /* operation description */
338 xfs_inode_t *ip, /* incore inode pointer */
339 xfs_extnum_t idx, /* index of entry(entries) inserted */
340 xfs_extnum_t cnt, /* count of entries inserted, 1 or 2 */
341 xfs_bmbt_irec_t *r1, /* inserted record 1 */
342 xfs_bmbt_irec_t *r2, /* inserted record 2 or null */
343 int whichfork); /* data or attr fork */
344
345 /*
346 * Add bmap trace entry after updating an extent list entry in place.
347 */
348 STATIC void
349 xfs_bmap_trace_post_update(
350 char *fname, /* function name */
351 char *desc, /* operation description */
352 xfs_inode_t *ip, /* incore inode pointer */
353 xfs_extnum_t idx, /* index of entry updated */
354 int whichfork); /* data or attr fork */
355
356 /*
357 * Add bmap trace entry prior to updating an extent list entry in place.
358 */
359 STATIC void
360 xfs_bmap_trace_pre_update(
361 char *fname, /* function name */
362 char *desc, /* operation description */
363 xfs_inode_t *ip, /* incore inode pointer */
364 xfs_extnum_t idx, /* index of entry to be updated */
365 int whichfork); /* data or attr fork */
366
367 #else
368 #define xfs_bmap_trace_delete(f,d,ip,i,c,w)
369 #define xfs_bmap_trace_insert(f,d,ip,i,c,r1,r2,w)
370 #define xfs_bmap_trace_post_update(f,d,ip,i,w)
371 #define xfs_bmap_trace_pre_update(f,d,ip,i,w)
372 #endif /* XFS_BMAP_TRACE */
373
374 /*
375 * Compute the worst-case number of indirect blocks that will be used
376 * for ip's delayed extent of length "len".
377 */
378 STATIC xfs_filblks_t
379 xfs_bmap_worst_indlen(
380 xfs_inode_t *ip, /* incore inode pointer */
381 xfs_filblks_t len); /* delayed extent length */
382
383 #ifdef DEBUG
384 /*
385 * Perform various validation checks on the values being returned
386 * from xfs_bmapi().
387 */
388 STATIC void
389 xfs_bmap_validate_ret(
390 xfs_fileoff_t bno,
391 xfs_filblks_t len,
392 int flags,
393 xfs_bmbt_irec_t *mval,
394 int nmap,
395 int ret_nmap);
396 #else
397 #define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
398 #endif /* DEBUG */
399
400 #if defined(XFS_RW_TRACE)
401 STATIC void
402 xfs_bunmap_trace(
403 xfs_inode_t *ip,
404 xfs_fileoff_t bno,
405 xfs_filblks_t len,
406 int flags,
407 inst_t *ra);
408 #else
409 #define xfs_bunmap_trace(ip, bno, len, flags, ra)
410 #endif /* XFS_RW_TRACE */
411
412 STATIC int
413 xfs_bmap_count_tree(
414 xfs_mount_t *mp,
415 xfs_trans_t *tp,
416 xfs_fsblock_t blockno,
417 int levelin,
418 int *count);
419
420 STATIC int
421 xfs_bmap_count_leaves(
422 xfs_bmbt_rec_t *frp,
423 int numrecs,
424 int *count);
425
426 STATIC int
427 xfs_bmap_disk_count_leaves(
428 xfs_bmbt_rec_t *frp,
429 int numrecs,
430 int *count);
431
432 /*
433 * Bmap internal routines.
434 */
435
436 /*
437 * Called from xfs_bmap_add_attrfork to handle btree format files.
438 */
439 STATIC int /* error */
440 xfs_bmap_add_attrfork_btree(
441 xfs_trans_t *tp, /* transaction pointer */
442 xfs_inode_t *ip, /* incore inode pointer */
443 xfs_fsblock_t *firstblock, /* first block allocated */
444 xfs_bmap_free_t *flist, /* blocks to free at commit */
445 int *flags) /* inode logging flags */
446 {
447 xfs_btree_cur_t *cur; /* btree cursor */
448 int error; /* error return value */
449 xfs_mount_t *mp; /* file system mount struct */
450 int stat; /* newroot status */
451
452 mp = ip->i_mount;
453 if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
454 *flags |= XFS_ILOG_DBROOT;
455 else {
456 cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
457 XFS_DATA_FORK);
458 cur->bc_private.b.flist = flist;
459 cur->bc_private.b.firstblock = *firstblock;
460 if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
461 goto error0;
462 ASSERT(stat == 1); /* must be at least one entry */
463 if ((error = xfs_bmbt_newroot(cur, flags, &stat)))
464 goto error0;
465 if (stat == 0) {
466 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
467 return XFS_ERROR(ENOSPC);
468 }
469 *firstblock = cur->bc_private.b.firstblock;
470 cur->bc_private.b.allocated = 0;
471 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
472 }
473 return 0;
474 error0:
475 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
476 return error;
477 }
478
479 /*
480 * Called from xfs_bmap_add_attrfork to handle extents format files.
481 */
482 STATIC int /* error */
483 xfs_bmap_add_attrfork_extents(
484 xfs_trans_t *tp, /* transaction pointer */
485 xfs_inode_t *ip, /* incore inode pointer */
486 xfs_fsblock_t *firstblock, /* first block allocated */
487 xfs_bmap_free_t *flist, /* blocks to free at commit */
488 int *flags) /* inode logging flags */
489 {
490 xfs_btree_cur_t *cur; /* bmap btree cursor */
491 int error; /* error return value */
492
493 if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
494 return 0;
495 cur = NULL;
496 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist, &cur, 0,
497 flags, XFS_DATA_FORK);
498 if (cur) {
499 cur->bc_private.b.allocated = 0;
500 xfs_btree_del_cursor(cur,
501 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
502 }
503 return error;
504 }
505
506 /*
507 * Called from xfs_bmap_add_attrfork to handle local format files.
508 */
509 STATIC int /* error */
510 xfs_bmap_add_attrfork_local(
511 xfs_trans_t *tp, /* transaction pointer */
512 xfs_inode_t *ip, /* incore inode pointer */
513 xfs_fsblock_t *firstblock, /* first block allocated */
514 xfs_bmap_free_t *flist, /* blocks to free at commit */
515 int *flags) /* inode logging flags */
516 {
517 xfs_da_args_t dargs; /* args for dir/attr code */
518 int error; /* error return value */
519 xfs_mount_t *mp; /* mount structure pointer */
520
521 if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
522 return 0;
523 if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
524 mp = ip->i_mount;
525 memset(&dargs, 0, sizeof(dargs));
526 dargs.dp = ip;
527 dargs.firstblock = firstblock;
528 dargs.flist = flist;
529 dargs.total = mp->m_dirblkfsbs;
530 dargs.whichfork = XFS_DATA_FORK;
531 dargs.trans = tp;
532 error = XFS_DIR_SHORTFORM_TO_SINGLE(mp, &dargs);
533 } else
534 error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
535 XFS_DATA_FORK);
536 return error;
537 }
538
539 /*
540 * Called by xfs_bmapi to update extent list structure and the btree
541 * after allocating space (or doing a delayed allocation).
542 */
543 STATIC int /* error */
544 xfs_bmap_add_extent(
545 xfs_inode_t *ip, /* incore inode pointer */
546 xfs_extnum_t idx, /* extent number to update/insert */
547 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
548 xfs_bmbt_irec_t *new, /* new data to put in extent list */
549 xfs_fsblock_t *first, /* pointer to firstblock variable */
550 xfs_bmap_free_t *flist, /* list of extents to be freed */
551 int *logflagsp, /* inode logging flags */
552 int whichfork, /* data or attr fork */
553 int rsvd) /* OK to use reserved data blocks */
554 {
555 xfs_btree_cur_t *cur; /* btree cursor or null */
556 xfs_filblks_t da_new; /* new count del alloc blocks used */
557 xfs_filblks_t da_old; /* old count del alloc blocks used */
558 int error; /* error return value */
559 #ifdef XFS_BMAP_TRACE
560 static char fname[] = "xfs_bmap_add_extent";
561 #endif
562 xfs_ifork_t *ifp; /* inode fork ptr */
563 int logflags; /* returned value */
564 xfs_extnum_t nextents; /* number of extents in file now */
565
566 XFS_STATS_INC(xs_add_exlist);
567 cur = *curp;
568 ifp = XFS_IFORK_PTR(ip, whichfork);
569 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
570 ASSERT(idx <= nextents);
571 da_old = da_new = 0;
572 error = 0;
573 /*
574 * This is the first extent added to a new/empty file.
575 * Special case this one, so other routines get to assume there are
576 * already extents in the list.
577 */
578 if (nextents == 0) {
579 xfs_bmap_trace_insert(fname, "insert empty", ip, 0, 1, new,
580 NULL, whichfork);
581 xfs_bmap_insert_exlist(ip, 0, 1, new, whichfork);
582 ASSERT(cur == NULL);
583 ifp->if_lastex = 0;
584 if (!ISNULLSTARTBLOCK(new->br_startblock)) {
585 XFS_IFORK_NEXT_SET(ip, whichfork, 1);
586 logflags = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
587 } else
588 logflags = 0;
589 }
590 /*
591 * Any kind of new delayed allocation goes here.
592 */
593 else if (ISNULLSTARTBLOCK(new->br_startblock)) {
594 if (cur)
595 ASSERT((cur->bc_private.b.flags &
596 XFS_BTCUR_BPRV_WASDEL) == 0);
597 if ((error = xfs_bmap_add_extent_hole_delay(ip, idx, cur, new,
598 &logflags, rsvd)))
599 goto done;
600 }
601 /*
602 * Real allocation off the end of the file.
603 */
604 else if (idx == nextents) {
605 if (cur)
606 ASSERT((cur->bc_private.b.flags &
607 XFS_BTCUR_BPRV_WASDEL) == 0);
608 if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur, new,
609 &logflags, whichfork)))
610 goto done;
611 } else {
612 xfs_bmbt_irec_t prev; /* old extent at offset idx */
613
614 /*
615 * Get the record referred to by idx.
616 */
617 xfs_bmbt_get_all(&ifp->if_u1.if_extents[idx], &prev);
618 /*
619 * If it's a real allocation record, and the new allocation ends
620 * after the start of the referred to record, then we're filling
621 * in a delayed or unwritten allocation with a real one, or
622 * converting real back to unwritten.
623 */
624 if (!ISNULLSTARTBLOCK(new->br_startblock) &&
625 new->br_startoff + new->br_blockcount > prev.br_startoff) {
626 if (prev.br_state != XFS_EXT_UNWRITTEN &&
627 ISNULLSTARTBLOCK(prev.br_startblock)) {
628 da_old = STARTBLOCKVAL(prev.br_startblock);
629 if (cur)
630 ASSERT(cur->bc_private.b.flags &
631 XFS_BTCUR_BPRV_WASDEL);
632 if ((error = xfs_bmap_add_extent_delay_real(ip,
633 idx, &cur, new, &da_new, first, flist,
634 &logflags, rsvd)))
635 goto done;
636 } else if (new->br_state == XFS_EXT_NORM) {
637 ASSERT(new->br_state == XFS_EXT_NORM);
638 if ((error = xfs_bmap_add_extent_unwritten_real(
639 ip, idx, &cur, new, &logflags)))
640 goto done;
641 } else {
642 ASSERT(new->br_state == XFS_EXT_UNWRITTEN);
643 if ((error = xfs_bmap_add_extent_unwritten_real(
644 ip, idx, &cur, new, &logflags)))
645 goto done;
646 }
647 ASSERT(*curp == cur || *curp == NULL);
648 }
649 /*
650 * Otherwise we're filling in a hole with an allocation.
651 */
652 else {
653 if (cur)
654 ASSERT((cur->bc_private.b.flags &
655 XFS_BTCUR_BPRV_WASDEL) == 0);
656 if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur,
657 new, &logflags, whichfork)))
658 goto done;
659 }
660 }
661
662 ASSERT(*curp == cur || *curp == NULL);
663 /*
664 * Convert to a btree if necessary.
665 */
666 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
667 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
668 int tmp_logflags; /* partial log flag return val */
669
670 ASSERT(cur == NULL);
671 error = xfs_bmap_extents_to_btree(ip->i_transp, ip, first,
672 flist, &cur, da_old > 0, &tmp_logflags, whichfork);
673 logflags |= tmp_logflags;
674 if (error)
675 goto done;
676 }
677 /*
678 * Adjust for changes in reserved delayed indirect blocks.
679 * Nothing to do for disk quotas here.
680 */
681 if (da_old || da_new) {
682 xfs_filblks_t nblks;
683
684 nblks = da_new;
685 if (cur)
686 nblks += cur->bc_private.b.allocated;
687 ASSERT(nblks <= da_old);
688 if (nblks < da_old)
689 xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
690 (int)(da_old - nblks), rsvd);
691 }
692 /*
693 * Clear out the allocated field, done with it now in any case.
694 */
695 if (cur) {
696 cur->bc_private.b.allocated = 0;
697 *curp = cur;
698 }
699 done:
700 #ifdef DEBUG
701 if (!error)
702 xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
703 #endif
704 *logflagsp = logflags;
705 return error;
706 }
707
708 /*
709 * Called by xfs_bmap_add_extent to handle cases converting a delayed
710 * allocation to a real allocation.
711 */
712 STATIC int /* error */
713 xfs_bmap_add_extent_delay_real(
714 xfs_inode_t *ip, /* incore inode pointer */
715 xfs_extnum_t idx, /* extent number to update/insert */
716 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
717 xfs_bmbt_irec_t *new, /* new data to put in extent list */
718 xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
719 xfs_fsblock_t *first, /* pointer to firstblock variable */
720 xfs_bmap_free_t *flist, /* list of extents to be freed */
721 int *logflagsp, /* inode logging flags */
722 int rsvd) /* OK to use reserved data block allocation */
723 {
724 xfs_bmbt_rec_t *base; /* base of extent entry list */
725 xfs_btree_cur_t *cur; /* btree cursor */
726 int diff; /* temp value */
727 xfs_bmbt_rec_t *ep; /* extent entry for idx */
728 int error; /* error return value */
729 #ifdef XFS_BMAP_TRACE
730 static char fname[] = "xfs_bmap_add_extent_delay_real";
731 #endif
732 int i; /* temp state */
733 xfs_fileoff_t new_endoff; /* end offset of new entry */
734 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
735 /* left is 0, right is 1, prev is 2 */
736 int rval=0; /* return value (logging flags) */
737 int state = 0;/* state bits, accessed thru macros */
738 xfs_filblks_t temp; /* value for dnew calculations */
739 xfs_filblks_t temp2; /* value for dnew calculations */
740 int tmp_rval; /* partial logging flags */
741 enum { /* bit number definitions for state */
742 LEFT_CONTIG, RIGHT_CONTIG,
743 LEFT_FILLING, RIGHT_FILLING,
744 LEFT_DELAY, RIGHT_DELAY,
745 LEFT_VALID, RIGHT_VALID
746 };
747
748 #define LEFT r[0]
749 #define RIGHT r[1]
750 #define PREV r[2]
751 #define MASK(b) (1 << (b))
752 #define MASK2(a,b) (MASK(a) | MASK(b))
753 #define MASK3(a,b,c) (MASK2(a,b) | MASK(c))
754 #define MASK4(a,b,c,d) (MASK3(a,b,c) | MASK(d))
755 #define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
756 #define STATE_TEST(b) (state & MASK(b))
757 #define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
758 ((state &= ~MASK(b)), 0))
759 #define SWITCH_STATE \
760 (state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
761
762 /*
763 * Set up a bunch of variables to make the tests simpler.
764 */
765 cur = *curp;
766 base = ip->i_df.if_u1.if_extents;
767 ep = &base[idx];
768 xfs_bmbt_get_all(ep, &PREV);
769 new_endoff = new->br_startoff + new->br_blockcount;
770 ASSERT(PREV.br_startoff <= new->br_startoff);
771 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
772 /*
773 * Set flags determining what part of the previous delayed allocation
774 * extent is being replaced by a real allocation.
775 */
776 STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
777 STATE_SET(RIGHT_FILLING,
778 PREV.br_startoff + PREV.br_blockcount == new_endoff);
779 /*
780 * Check and set flags if this segment has a left neighbor.
781 * Don't set contiguous if the combined extent would be too large.
782 */
783 if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
784 xfs_bmbt_get_all(ep - 1, &LEFT);
785 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
786 }
787 STATE_SET(LEFT_CONTIG,
788 STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
789 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
790 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
791 LEFT.br_state == new->br_state &&
792 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
793 /*
794 * Check and set flags if this segment has a right neighbor.
795 * Don't set contiguous if the combined extent would be too large.
796 * Also check for all-three-contiguous being too large.
797 */
798 if (STATE_SET_TEST(RIGHT_VALID,
799 idx <
800 ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
801 xfs_bmbt_get_all(ep + 1, &RIGHT);
802 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
803 }
804 STATE_SET(RIGHT_CONTIG,
805 STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
806 new_endoff == RIGHT.br_startoff &&
807 new->br_startblock + new->br_blockcount ==
808 RIGHT.br_startblock &&
809 new->br_state == RIGHT.br_state &&
810 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
811 ((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
812 MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
813 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
814 <= MAXEXTLEN));
815 error = 0;
816 /*
817 * Switch out based on the FILLING and CONTIG state bits.
818 */
819 switch (SWITCH_STATE) {
820
821 case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
822 /*
823 * Filling in all of a previously delayed allocation extent.
824 * The left and right neighbors are both contiguous with new.
825 */
826 xfs_bmap_trace_pre_update(fname, "LF|RF|LC|RC", ip, idx - 1,
827 XFS_DATA_FORK);
828 xfs_bmbt_set_blockcount(ep - 1,
829 LEFT.br_blockcount + PREV.br_blockcount +
830 RIGHT.br_blockcount);
831 xfs_bmap_trace_post_update(fname, "LF|RF|LC|RC", ip, idx - 1,
832 XFS_DATA_FORK);
833 xfs_bmap_trace_delete(fname, "LF|RF|LC|RC", ip, idx, 2,
834 XFS_DATA_FORK);
835 xfs_bmap_delete_exlist(ip, idx, 2, XFS_DATA_FORK);
836 ip->i_df.if_lastex = idx - 1;
837 ip->i_d.di_nextents--;
838 if (cur == NULL)
839 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
840 else {
841 rval = XFS_ILOG_CORE;
842 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
843 RIGHT.br_startblock,
844 RIGHT.br_blockcount, &i)))
845 goto done;
846 ASSERT(i == 1);
847 if ((error = xfs_bmbt_delete(cur, &i)))
848 goto done;
849 ASSERT(i == 1);
850 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
851 goto done;
852 ASSERT(i == 1);
853 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
854 LEFT.br_startblock,
855 LEFT.br_blockcount +
856 PREV.br_blockcount +
857 RIGHT.br_blockcount, LEFT.br_state)))
858 goto done;
859 }
860 *dnew = 0;
861 break;
862
863 case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
864 /*
865 * Filling in all of a previously delayed allocation extent.
866 * The left neighbor is contiguous, the right is not.
867 */
868 xfs_bmap_trace_pre_update(fname, "LF|RF|LC", ip, idx - 1,
869 XFS_DATA_FORK);
870 xfs_bmbt_set_blockcount(ep - 1,
871 LEFT.br_blockcount + PREV.br_blockcount);
872 xfs_bmap_trace_post_update(fname, "LF|RF|LC", ip, idx - 1,
873 XFS_DATA_FORK);
874 ip->i_df.if_lastex = idx - 1;
875 xfs_bmap_trace_delete(fname, "LF|RF|LC", ip, idx, 1,
876 XFS_DATA_FORK);
877 xfs_bmap_delete_exlist(ip, idx, 1, XFS_DATA_FORK);
878 if (cur == NULL)
879 rval = XFS_ILOG_DEXT;
880 else {
881 rval = 0;
882 if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
883 LEFT.br_startblock, LEFT.br_blockcount,
884 &i)))
885 goto done;
886 ASSERT(i == 1);
887 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
888 LEFT.br_startblock,
889 LEFT.br_blockcount +
890 PREV.br_blockcount, LEFT.br_state)))
891 goto done;
892 }
893 *dnew = 0;
894 break;
895
896 case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
897 /*
898 * Filling in all of a previously delayed allocation extent.
899 * The right neighbor is contiguous, the left is not.
900 */
901 xfs_bmap_trace_pre_update(fname, "LF|RF|RC", ip, idx,
902 XFS_DATA_FORK);
903 xfs_bmbt_set_startblock(ep, new->br_startblock);
904 xfs_bmbt_set_blockcount(ep,
905 PREV.br_blockcount + RIGHT.br_blockcount);
906 xfs_bmap_trace_post_update(fname, "LF|RF|RC", ip, idx,
907 XFS_DATA_FORK);
908 ip->i_df.if_lastex = idx;
909 xfs_bmap_trace_delete(fname, "LF|RF|RC", ip, idx + 1, 1,
910 XFS_DATA_FORK);
911 xfs_bmap_delete_exlist(ip, idx + 1, 1, XFS_DATA_FORK);
912 if (cur == NULL)
913 rval = XFS_ILOG_DEXT;
914 else {
915 rval = 0;
916 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
917 RIGHT.br_startblock,
918 RIGHT.br_blockcount, &i)))
919 goto done;
920 ASSERT(i == 1);
921 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
922 new->br_startblock,
923 PREV.br_blockcount +
924 RIGHT.br_blockcount, PREV.br_state)))
925 goto done;
926 }
927 *dnew = 0;
928 break;
929
930 case MASK2(LEFT_FILLING, RIGHT_FILLING):
931 /*
932 * Filling in all of a previously delayed allocation extent.
933 * Neither the left nor right neighbors are contiguous with
934 * the new one.
935 */
936 xfs_bmap_trace_pre_update(fname, "LF|RF", ip, idx,
937 XFS_DATA_FORK);
938 xfs_bmbt_set_startblock(ep, new->br_startblock);
939 xfs_bmap_trace_post_update(fname, "LF|RF", ip, idx,
940 XFS_DATA_FORK);
941 ip->i_df.if_lastex = idx;
942 ip->i_d.di_nextents++;
943 if (cur == NULL)
944 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
945 else {
946 rval = XFS_ILOG_CORE;
947 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
948 new->br_startblock, new->br_blockcount,
949 &i)))
950 goto done;
951 ASSERT(i == 0);
952 cur->bc_rec.b.br_state = XFS_EXT_NORM;
953 if ((error = xfs_bmbt_insert(cur, &i)))
954 goto done;
955 ASSERT(i == 1);
956 }
957 *dnew = 0;
958 break;
959
960 case MASK2(LEFT_FILLING, LEFT_CONTIG):
961 /*
962 * Filling in the first part of a previous delayed allocation.
963 * The left neighbor is contiguous.
964 */
965 xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx - 1,
966 XFS_DATA_FORK);
967 xfs_bmbt_set_blockcount(ep - 1,
968 LEFT.br_blockcount + new->br_blockcount);
969 xfs_bmbt_set_startoff(ep,
970 PREV.br_startoff + new->br_blockcount);
971 xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx - 1,
972 XFS_DATA_FORK);
973 temp = PREV.br_blockcount - new->br_blockcount;
974 xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx,
975 XFS_DATA_FORK);
976 xfs_bmbt_set_blockcount(ep, temp);
977 ip->i_df.if_lastex = idx - 1;
978 if (cur == NULL)
979 rval = XFS_ILOG_DEXT;
980 else {
981 rval = 0;
982 if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
983 LEFT.br_startblock, LEFT.br_blockcount,
984 &i)))
985 goto done;
986 ASSERT(i == 1);
987 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
988 LEFT.br_startblock,
989 LEFT.br_blockcount +
990 new->br_blockcount,
991 LEFT.br_state)))
992 goto done;
993 }
994 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
995 STARTBLOCKVAL(PREV.br_startblock));
996 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
997 xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx,
998 XFS_DATA_FORK);
999 *dnew = temp;
1000 break;
1001
1002 case MASK(LEFT_FILLING):
1003 /*
1004 * Filling in the first part of a previous delayed allocation.
1005 * The left neighbor is not contiguous.
1006 */
1007 xfs_bmap_trace_pre_update(fname, "LF", ip, idx, XFS_DATA_FORK);
1008 xfs_bmbt_set_startoff(ep, new_endoff);
1009 temp = PREV.br_blockcount - new->br_blockcount;
1010 xfs_bmbt_set_blockcount(ep, temp);
1011 xfs_bmap_trace_insert(fname, "LF", ip, idx, 1, new, NULL,
1012 XFS_DATA_FORK);
1013 xfs_bmap_insert_exlist(ip, idx, 1, new, XFS_DATA_FORK);
1014 ip->i_df.if_lastex = idx;
1015 ip->i_d.di_nextents++;
1016 if (cur == NULL)
1017 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1018 else {
1019 rval = XFS_ILOG_CORE;
1020 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1021 new->br_startblock, new->br_blockcount,
1022 &i)))
1023 goto done;
1024 ASSERT(i == 0);
1025 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1026 if ((error = xfs_bmbt_insert(cur, &i)))
1027 goto done;
1028 ASSERT(i == 1);
1029 }
1030 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1031 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1032 error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
1033 first, flist, &cur, 1, &tmp_rval,
1034 XFS_DATA_FORK);
1035 rval |= tmp_rval;
1036 if (error)
1037 goto done;
1038 }
1039 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1040 STARTBLOCKVAL(PREV.br_startblock) -
1041 (cur ? cur->bc_private.b.allocated : 0));
1042 base = ip->i_df.if_u1.if_extents;
1043 ep = &base[idx + 1];
1044 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1045 xfs_bmap_trace_post_update(fname, "LF", ip, idx + 1,
1046 XFS_DATA_FORK);
1047 *dnew = temp;
1048 break;
1049
1050 case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
1051 /*
1052 * Filling in the last part of a previous delayed allocation.
1053 * The right neighbor is contiguous with the new allocation.
1054 */
1055 temp = PREV.br_blockcount - new->br_blockcount;
1056 xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx,
1057 XFS_DATA_FORK);
1058 xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx + 1,
1059 XFS_DATA_FORK);
1060 xfs_bmbt_set_blockcount(ep, temp);
1061 xfs_bmbt_set_allf(ep + 1, new->br_startoff, new->br_startblock,
1062 new->br_blockcount + RIGHT.br_blockcount,
1063 RIGHT.br_state);
1064 xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx + 1,
1065 XFS_DATA_FORK);
1066 ip->i_df.if_lastex = idx + 1;
1067 if (cur == NULL)
1068 rval = XFS_ILOG_DEXT;
1069 else {
1070 rval = 0;
1071 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1072 RIGHT.br_startblock,
1073 RIGHT.br_blockcount, &i)))
1074 goto done;
1075 ASSERT(i == 1);
1076 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1077 new->br_startblock,
1078 new->br_blockcount +
1079 RIGHT.br_blockcount,
1080 RIGHT.br_state)))
1081 goto done;
1082 }
1083 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1084 STARTBLOCKVAL(PREV.br_startblock));
1085 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1086 xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx,
1087 XFS_DATA_FORK);
1088 *dnew = temp;
1089 break;
1090
1091 case MASK(RIGHT_FILLING):
1092 /*
1093 * Filling in the last part of a previous delayed allocation.
1094 * The right neighbor is not contiguous.
1095 */
1096 temp = PREV.br_blockcount - new->br_blockcount;
1097 xfs_bmap_trace_pre_update(fname, "RF", ip, idx, XFS_DATA_FORK);
1098 xfs_bmbt_set_blockcount(ep, temp);
1099 xfs_bmap_trace_insert(fname, "RF", ip, idx + 1, 1,
1100 new, NULL, XFS_DATA_FORK);
1101 xfs_bmap_insert_exlist(ip, idx + 1, 1, new, XFS_DATA_FORK);
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 ASSERT(i == 0);
1113 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1114 if ((error = xfs_bmbt_insert(cur, &i)))
1115 goto done;
1116 ASSERT(i == 1);
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_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1128 STARTBLOCKVAL(PREV.br_startblock) -
1129 (cur ? cur->bc_private.b.allocated : 0));
1130 base = ip->i_df.if_u1.if_extents;
1131 ep = &base[idx];
1132 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1133 xfs_bmap_trace_post_update(fname, "RF", ip, idx, XFS_DATA_FORK);
1134 *dnew = temp;
1135 break;
1136
1137 case 0:
1138 /*
1139 * Filling in the middle part of a previous delayed allocation.
1140 * Contiguity is impossible here.
1141 * This case is avoided almost all the time.
1142 */
1143 temp = new->br_startoff - PREV.br_startoff;
1144 xfs_bmap_trace_pre_update(fname, "0", ip, idx, XFS_DATA_FORK);
1145 xfs_bmbt_set_blockcount(ep, temp);
1146 r[0] = *new;
1147 r[1].br_startoff = new_endoff;
1148 temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
1149 r[1].br_blockcount = temp2;
1150 xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 2, &r[0], &r[1],
1151 XFS_DATA_FORK);
1152 xfs_bmap_insert_exlist(ip, idx + 1, 2, &r[0], XFS_DATA_FORK);
1153 ip->i_df.if_lastex = idx + 1;
1154 ip->i_d.di_nextents++;
1155 if (cur == NULL)
1156 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1157 else {
1158 rval = XFS_ILOG_CORE;
1159 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1160 new->br_startblock, new->br_blockcount,
1161 &i)))
1162 goto done;
1163 ASSERT(i == 0);
1164 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1165 if ((error = xfs_bmbt_insert(cur, &i)))
1166 goto done;
1167 ASSERT(i == 1);
1168 }
1169 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1170 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1171 error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
1172 first, flist, &cur, 1, &tmp_rval,
1173 XFS_DATA_FORK);
1174 rval |= tmp_rval;
1175 if (error)
1176 goto done;
1177 }
1178 temp = xfs_bmap_worst_indlen(ip, temp);
1179 temp2 = xfs_bmap_worst_indlen(ip, temp2);
1180 diff = (int)(temp + temp2 - STARTBLOCKVAL(PREV.br_startblock) -
1181 (cur ? cur->bc_private.b.allocated : 0));
1182 if (diff > 0 &&
1183 xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS, -diff, rsvd)) {
1184 /*
1185 * Ick gross gag me with a spoon.
1186 */
1187 ASSERT(0); /* want to see if this ever happens! */
1188 while (diff > 0) {
1189 if (temp) {
1190 temp--;
1191 diff--;
1192 if (!diff ||
1193 !xfs_mod_incore_sb(ip->i_mount,
1194 XFS_SBS_FDBLOCKS, -diff, rsvd))
1195 break;
1196 }
1197 if (temp2) {
1198 temp2--;
1199 diff--;
1200 if (!diff ||
1201 !xfs_mod_incore_sb(ip->i_mount,
1202 XFS_SBS_FDBLOCKS, -diff, rsvd))
1203 break;
1204 }
1205 }
1206 }
1207 base = ip->i_df.if_u1.if_extents;
1208 ep = &base[idx];
1209 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1210 xfs_bmap_trace_post_update(fname, "0", ip, idx, XFS_DATA_FORK);
1211 xfs_bmap_trace_pre_update(fname, "0", ip, idx + 2,
1212 XFS_DATA_FORK);
1213 xfs_bmbt_set_startblock(ep + 2, NULLSTARTBLOCK((int)temp2));
1214 xfs_bmap_trace_post_update(fname, "0", ip, idx + 2,
1215 XFS_DATA_FORK);
1216 *dnew = temp + temp2;
1217 break;
1218
1219 case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1220 case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1221 case MASK2(LEFT_FILLING, RIGHT_CONTIG):
1222 case MASK2(RIGHT_FILLING, LEFT_CONTIG):
1223 case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
1224 case MASK(LEFT_CONTIG):
1225 case MASK(RIGHT_CONTIG):
1226 /*
1227 * These cases are all impossible.
1228 */
1229 ASSERT(0);
1230 }
1231 *curp = cur;
1232 done:
1233 *logflagsp = rval;
1234 return error;
1235 #undef LEFT
1236 #undef RIGHT
1237 #undef PREV
1238 #undef MASK
1239 #undef MASK2
1240 #undef MASK3
1241 #undef MASK4
1242 #undef STATE_SET
1243 #undef STATE_TEST
1244 #undef STATE_SET_TEST
1245 #undef SWITCH_STATE
1246 }
1247
1248 /*
1249 * Called by xfs_bmap_add_extent to handle cases converting an unwritten
1250 * allocation to a real allocation or vice versa.
1251 */
1252 STATIC int /* error */
1253 xfs_bmap_add_extent_unwritten_real(
1254 xfs_inode_t *ip, /* incore inode pointer */
1255 xfs_extnum_t idx, /* extent number to update/insert */
1256 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
1257 xfs_bmbt_irec_t *new, /* new data to put in extent list */
1258 int *logflagsp) /* inode logging flags */
1259 {
1260 xfs_bmbt_rec_t *base; /* base of extent entry list */
1261 xfs_btree_cur_t *cur; /* btree cursor */
1262 xfs_bmbt_rec_t *ep; /* extent entry for idx */
1263 int error; /* error return value */
1264 #ifdef XFS_BMAP_TRACE
1265 static char fname[] = "xfs_bmap_add_extent_unwritten_real";
1266 #endif
1267 int i; /* temp state */
1268 xfs_fileoff_t new_endoff; /* end offset of new entry */
1269 xfs_exntst_t newext; /* new extent state */
1270 xfs_exntst_t oldext; /* old extent state */
1271 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
1272 /* left is 0, right is 1, prev is 2 */
1273 int rval=0; /* return value (logging flags) */
1274 int state = 0;/* state bits, accessed thru macros */
1275 enum { /* bit number definitions for state */
1276 LEFT_CONTIG, RIGHT_CONTIG,
1277 LEFT_FILLING, RIGHT_FILLING,
1278 LEFT_DELAY, RIGHT_DELAY,
1279 LEFT_VALID, RIGHT_VALID
1280 };
1281
1282 #define LEFT r[0]
1283 #define RIGHT r[1]
1284 #define PREV r[2]
1285 #define MASK(b) (1 << (b))
1286 #define MASK2(a,b) (MASK(a) | MASK(b))
1287 #define MASK3(a,b,c) (MASK2(a,b) | MASK(c))
1288 #define MASK4(a,b,c,d) (MASK3(a,b,c) | MASK(d))
1289 #define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
1290 #define STATE_TEST(b) (state & MASK(b))
1291 #define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
1292 ((state &= ~MASK(b)), 0))
1293 #define SWITCH_STATE \
1294 (state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
1295
1296 /*
1297 * Set up a bunch of variables to make the tests simpler.
1298 */
1299 error = 0;
1300 cur = *curp;
1301 base = ip->i_df.if_u1.if_extents;
1302 ep = &base[idx];
1303 xfs_bmbt_get_all(ep, &PREV);
1304 newext = new->br_state;
1305 oldext = (newext == XFS_EXT_UNWRITTEN) ?
1306 XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
1307 ASSERT(PREV.br_state == oldext);
1308 new_endoff = new->br_startoff + new->br_blockcount;
1309 ASSERT(PREV.br_startoff <= new->br_startoff);
1310 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
1311 /*
1312 * Set flags determining what part of the previous oldext allocation
1313 * extent is being replaced by a newext allocation.
1314 */
1315 STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
1316 STATE_SET(RIGHT_FILLING,
1317 PREV.br_startoff + PREV.br_blockcount == new_endoff);
1318 /*
1319 * Check and set flags if this segment has a left neighbor.
1320 * Don't set contiguous if the combined extent would be too large.
1321 */
1322 if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
1323 xfs_bmbt_get_all(ep - 1, &LEFT);
1324 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
1325 }
1326 STATE_SET(LEFT_CONTIG,
1327 STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
1328 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
1329 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
1330 LEFT.br_state == newext &&
1331 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
1332 /*
1333 * Check and set flags if this segment has a right neighbor.
1334 * Don't set contiguous if the combined extent would be too large.
1335 * Also check for all-three-contiguous being too large.
1336 */
1337 if (STATE_SET_TEST(RIGHT_VALID,
1338 idx <
1339 ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
1340 xfs_bmbt_get_all(ep + 1, &RIGHT);
1341 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
1342 }
1343 STATE_SET(RIGHT_CONTIG,
1344 STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
1345 new_endoff == RIGHT.br_startoff &&
1346 new->br_startblock + new->br_blockcount ==
1347 RIGHT.br_startblock &&
1348 newext == RIGHT.br_state &&
1349 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
1350 ((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
1351 MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
1352 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
1353 <= MAXEXTLEN));
1354 /*
1355 * Switch out based on the FILLING and CONTIG state bits.
1356 */
1357 switch (SWITCH_STATE) {
1358
1359 case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1360 /*
1361 * Setting all of a previous oldext extent to newext.
1362 * The left and right neighbors are both contiguous with new.
1363 */
1364 xfs_bmap_trace_pre_update(fname, "LF|RF|LC|RC", ip, idx - 1,
1365 XFS_DATA_FORK);
1366 xfs_bmbt_set_blockcount(ep - 1,
1367 LEFT.br_blockcount + PREV.br_blockcount +
1368 RIGHT.br_blockcount);
1369 xfs_bmap_trace_post_update(fname, "LF|RF|LC|RC", ip, idx - 1,
1370 XFS_DATA_FORK);
1371 xfs_bmap_trace_delete(fname, "LF|RF|LC|RC", ip, idx, 2,
1372 XFS_DATA_FORK);
1373 xfs_bmap_delete_exlist(ip, idx, 2, XFS_DATA_FORK);
1374 ip->i_df.if_lastex = idx - 1;
1375 ip->i_d.di_nextents -= 2;
1376 if (cur == NULL)
1377 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1378 else {
1379 rval = XFS_ILOG_CORE;
1380 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1381 RIGHT.br_startblock,
1382 RIGHT.br_blockcount, &i)))
1383 goto done;
1384 ASSERT(i == 1);
1385 if ((error = xfs_bmbt_delete(cur, &i)))
1386 goto done;
1387 ASSERT(i == 1);
1388 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1389 goto done;
1390 ASSERT(i == 1);
1391 if ((error = xfs_bmbt_delete(cur, &i)))
1392 goto done;
1393 ASSERT(i == 1);
1394 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1395 goto done;
1396 ASSERT(i == 1);
1397 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1398 LEFT.br_startblock,
1399 LEFT.br_blockcount + PREV.br_blockcount +
1400 RIGHT.br_blockcount, LEFT.br_state)))
1401 goto done;
1402 }
1403 break;
1404
1405 case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
1406 /*
1407 * Setting all of a previous oldext extent to newext.
1408 * The left neighbor is contiguous, the right is not.
1409 */
1410 xfs_bmap_trace_pre_update(fname, "LF|RF|LC", ip, idx - 1,
1411 XFS_DATA_FORK);
1412 xfs_bmbt_set_blockcount(ep - 1,
1413 LEFT.br_blockcount + PREV.br_blockcount);
1414 xfs_bmap_trace_post_update(fname, "LF|RF|LC", ip, idx - 1,
1415 XFS_DATA_FORK);
1416 ip->i_df.if_lastex = idx - 1;
1417 xfs_bmap_trace_delete(fname, "LF|RF|LC", ip, idx, 1,
1418 XFS_DATA_FORK);
1419 xfs_bmap_delete_exlist(ip, idx, 1, XFS_DATA_FORK);
1420 ip->i_d.di_nextents--;
1421 if (cur == NULL)
1422 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1423 else {
1424 rval = XFS_ILOG_CORE;
1425 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1426 PREV.br_startblock, PREV.br_blockcount,
1427 &i)))
1428 goto done;
1429 ASSERT(i == 1);
1430 if ((error = xfs_bmbt_delete(cur, &i)))
1431 goto done;
1432 ASSERT(i == 1);
1433 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1434 goto done;
1435 ASSERT(i == 1);
1436 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1437 LEFT.br_startblock,
1438 LEFT.br_blockcount + PREV.br_blockcount,
1439 LEFT.br_state)))
1440 goto done;
1441 }
1442 break;
1443
1444 case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
1445 /*
1446 * Setting all of a previous oldext extent to newext.
1447 * The right neighbor is contiguous, the left is not.
1448 */
1449 xfs_bmap_trace_pre_update(fname, "LF|RF|RC", ip, idx,
1450 XFS_DATA_FORK);
1451 xfs_bmbt_set_blockcount(ep,
1452 PREV.br_blockcount + RIGHT.br_blockcount);
1453 xfs_bmbt_set_state(ep, newext);
1454 xfs_bmap_trace_post_update(fname, "LF|RF|RC", ip, idx,
1455 XFS_DATA_FORK);
1456 ip->i_df.if_lastex = idx;
1457 xfs_bmap_trace_delete(fname, "LF|RF|RC", ip, idx + 1, 1,
1458 XFS_DATA_FORK);
1459 xfs_bmap_delete_exlist(ip, idx + 1, 1, XFS_DATA_FORK);
1460 ip->i_d.di_nextents--;
1461 if (cur == NULL)
1462 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1463 else {
1464 rval = XFS_ILOG_CORE;
1465 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1466 RIGHT.br_startblock,
1467 RIGHT.br_blockcount, &i)))
1468 goto done;
1469 ASSERT(i == 1);
1470 if ((error = xfs_bmbt_delete(cur, &i)))
1471 goto done;
1472 ASSERT(i == 1);
1473 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1474 goto done;
1475 ASSERT(i == 1);
1476 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1477 new->br_startblock,
1478 new->br_blockcount + RIGHT.br_blockcount,
1479 newext)))
1480 goto done;
1481 }
1482 break;
1483
1484 case MASK2(LEFT_FILLING, RIGHT_FILLING):
1485 /*
1486 * Setting all of a previous oldext extent to newext.
1487 * Neither the left nor right neighbors are contiguous with
1488 * the new one.
1489 */
1490 xfs_bmap_trace_pre_update(fname, "LF|RF", ip, idx,
1491 XFS_DATA_FORK);
1492 xfs_bmbt_set_state(ep, newext);
1493 xfs_bmap_trace_post_update(fname, "LF|RF", ip, idx,
1494 XFS_DATA_FORK);
1495 ip->i_df.if_lastex = idx;
1496 if (cur == NULL)
1497 rval = XFS_ILOG_DEXT;
1498 else {
1499 rval = 0;
1500 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1501 new->br_startblock, new->br_blockcount,
1502 &i)))
1503 goto done;
1504 ASSERT(i == 1);
1505 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1506 new->br_startblock, new->br_blockcount,
1507 newext)))
1508 goto done;
1509 }
1510 break;
1511
1512 case MASK2(LEFT_FILLING, LEFT_CONTIG):
1513 /*
1514 * Setting the first part of a previous oldext extent to newext.
1515 * The left neighbor is contiguous.
1516 */
1517 xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx - 1,
1518 XFS_DATA_FORK);
1519 xfs_bmbt_set_blockcount(ep - 1,
1520 LEFT.br_blockcount + new->br_blockcount);
1521 xfs_bmbt_set_startoff(ep,
1522 PREV.br_startoff + new->br_blockcount);
1523 xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx - 1,
1524 XFS_DATA_FORK);
1525 xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx,
1526 XFS_DATA_FORK);
1527 xfs_bmbt_set_startblock(ep,
1528 new->br_startblock + new->br_blockcount);
1529 xfs_bmbt_set_blockcount(ep,
1530 PREV.br_blockcount - new->br_blockcount);
1531 xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx,
1532 XFS_DATA_FORK);
1533 ip->i_df.if_lastex = idx - 1;
1534 if (cur == NULL)
1535 rval = XFS_ILOG_DEXT;
1536 else {
1537 rval = 0;
1538 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1539 PREV.br_startblock, PREV.br_blockcount,
1540 &i)))
1541 goto done;
1542 ASSERT(i == 1);
1543 if ((error = xfs_bmbt_update(cur,
1544 PREV.br_startoff + new->br_blockcount,
1545 PREV.br_startblock + new->br_blockcount,
1546 PREV.br_blockcount - new->br_blockcount,
1547 oldext)))
1548 goto done;
1549 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1550 goto done;
1551 if (xfs_bmbt_update(cur, LEFT.br_startoff,
1552 LEFT.br_startblock,
1553 LEFT.br_blockcount + new->br_blockcount,
1554 LEFT.br_state))
1555 goto done;
1556 }
1557 break;
1558
1559 case MASK(LEFT_FILLING):
1560 /*
1561 * Setting the first part of a previous oldext extent to newext.
1562 * The left neighbor is not contiguous.
1563 */
1564 xfs_bmap_trace_pre_update(fname, "LF", ip, idx, XFS_DATA_FORK);
1565 ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
1566 xfs_bmbt_set_startoff(ep, new_endoff);
1567 xfs_bmbt_set_blockcount(ep,
1568 PREV.br_blockcount - new->br_blockcount);
1569 xfs_bmbt_set_startblock(ep,
1570 new->br_startblock + new->br_blockcount);
1571 xfs_bmap_trace_post_update(fname, "LF", ip, idx, XFS_DATA_FORK);
1572 xfs_bmap_trace_insert(fname, "LF", ip, idx, 1, new, NULL,
1573 XFS_DATA_FORK);
1574 xfs_bmap_insert_exlist(ip, idx, 1, new, XFS_DATA_FORK);
1575 ip->i_df.if_lastex = idx;
1576 ip->i_d.di_nextents++;
1577 if (cur == NULL)
1578 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1579 else {
1580 rval = XFS_ILOG_CORE;
1581 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1582 PREV.br_startblock, PREV.br_blockcount,
1583 &i)))
1584 goto done;
1585 ASSERT(i == 1);
1586 if ((error = xfs_bmbt_update(cur,
1587 PREV.br_startoff + new->br_blockcount,
1588 PREV.br_startblock + new->br_blockcount,
1589 PREV.br_blockcount - new->br_blockcount,
1590 oldext)))
1591 goto done;
1592 cur->bc_rec.b = *new;
1593 if ((error = xfs_bmbt_insert(cur, &i)))
1594 goto done;
1595 ASSERT(i == 1);
1596 }
1597 break;
1598
1599 case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
1600 /*
1601 * Setting the last part of a previous oldext extent to newext.
1602 * The right neighbor is contiguous with the new allocation.
1603 */
1604 xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx,
1605 XFS_DATA_FORK);
1606 xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx + 1,
1607 XFS_DATA_FORK);
1608 xfs_bmbt_set_blockcount(ep,
1609 PREV.br_blockcount - new->br_blockcount);
1610 xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx,
1611 XFS_DATA_FORK);
1612 xfs_bmbt_set_allf(ep + 1, new->br_startoff, new->br_startblock,
1613 new->br_blockcount + RIGHT.br_blockcount, newext);
1614 xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx + 1,
1615 XFS_DATA_FORK);
1616 ip->i_df.if_lastex = idx + 1;
1617 if (cur == NULL)
1618 rval = XFS_ILOG_DEXT;
1619 else {
1620 rval = 0;
1621 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1622 PREV.br_startblock,
1623 PREV.br_blockcount, &i)))
1624 goto done;
1625 ASSERT(i == 1);
1626 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1627 PREV.br_startblock,
1628 PREV.br_blockcount - new->br_blockcount,
1629 oldext)))
1630 goto done;
1631 if ((error = xfs_bmbt_increment(cur, 0, &i)))
1632 goto done;
1633 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1634 new->br_startblock,
1635 new->br_blockcount + RIGHT.br_blockcount,
1636 newext)))
1637 goto done;
1638 }
1639 break;
1640
1641 case MASK(RIGHT_FILLING):
1642 /*
1643 * Setting the last part of a previous oldext extent to newext.
1644 * The right neighbor is not contiguous.
1645 */
1646 xfs_bmap_trace_pre_update(fname, "RF", ip, idx, XFS_DATA_FORK);
1647 xfs_bmbt_set_blockcount(ep,
1648 PREV.br_blockcount - new->br_blockcount);
1649 xfs_bmap_trace_post_update(fname, "RF", ip, idx, XFS_DATA_FORK);
1650 xfs_bmap_trace_insert(fname, "RF", ip, idx + 1, 1,
1651 new, NULL, XFS_DATA_FORK);
1652 xfs_bmap_insert_exlist(ip, idx + 1, 1, new, XFS_DATA_FORK);
1653 ip->i_df.if_lastex = idx + 1;
1654 ip->i_d.di_nextents++;
1655 if (cur == NULL)
1656 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1657 else {
1658 rval = XFS_ILOG_CORE;
1659 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1660 PREV.br_startblock, PREV.br_blockcount,
1661 &i)))
1662 goto done;
1663 ASSERT(i == 1);
1664 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1665 PREV.br_startblock,
1666 PREV.br_blockcount - new->br_blockcount,
1667 oldext)))
1668 goto done;
1669 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1670 new->br_startblock, new->br_blockcount,
1671 &i)))
1672 goto done;
1673 ASSERT(i == 0);
1674 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1675 if ((error = xfs_bmbt_insert(cur, &i)))
1676 goto done;
1677 ASSERT(i == 1);
1678 }
1679 break;
1680
1681 case 0:
1682 /*
1683 * Setting the middle part of a previous oldext extent to
1684 * newext. Contiguity is impossible here.
1685 * One extent becomes three extents.
1686 */
1687 xfs_bmap_trace_pre_update(fname, "0", ip, idx, XFS_DATA_FORK);
1688 xfs_bmbt_set_blockcount(ep,
1689 new->br_startoff - PREV.br_startoff);
1690 xfs_bmap_trace_post_update(fname, "0", ip, idx, XFS_DATA_FORK);
1691 r[0] = *new;
1692 r[1].br_startoff = new_endoff;
1693 r[1].br_blockcount =
1694 PREV.br_startoff + PREV.br_blockcount - new_endoff;
1695 r[1].br_startblock = new->br_startblock + new->br_blockcount;
1696 r[1].br_state = oldext;
1697 xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 2, &r[0], &r[1],
1698 XFS_DATA_FORK);
1699 xfs_bmap_insert_exlist(ip, idx + 1, 2, &r[0], XFS_DATA_FORK);
1700 ip->i_df.if_lastex = idx + 1;
1701 ip->i_d.di_nextents += 2;
1702 if (cur == NULL)
1703 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1704 else {
1705 rval = XFS_ILOG_CORE;
1706 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1707 PREV.br_startblock, PREV.br_blockcount,
1708 &i)))
1709 goto done;
1710 ASSERT(i == 1);
1711 /* new right extent - oldext */
1712 if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
1713 r[1].br_startblock, r[1].br_blockcount,
1714 r[1].br_state)))
1715 goto done;
1716 /* new left extent - oldext */
1717 PREV.br_blockcount =
1718 new->br_startoff - PREV.br_startoff;
1719 cur->bc_rec.b = PREV;
1720 if ((error = xfs_bmbt_insert(cur, &i)))
1721 goto done;
1722 ASSERT(i == 1);
1723 if ((error = xfs_bmbt_increment(cur, 0, &i)))
1724 goto done;
1725 ASSERT(i == 1);
1726 /* new middle extent - newext */
1727 cur->bc_rec.b = *new;
1728 if ((error = xfs_bmbt_insert(cur, &i)))
1729 goto done;
1730 ASSERT(i == 1);
1731 }
1732 break;
1733
1734 case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1735 case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1736 case MASK2(LEFT_FILLING, RIGHT_CONTIG):
1737 case MASK2(RIGHT_FILLING, LEFT_CONTIG):
1738 case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
1739 case MASK(LEFT_CONTIG):
1740 case MASK(RIGHT_CONTIG):
1741 /*
1742 * These cases are all impossible.
1743 */
1744 ASSERT(0);
1745 }
1746 *curp = cur;
1747 done:
1748 *logflagsp = rval;
1749 return error;
1750 #undef LEFT
1751 #undef RIGHT
1752 #undef PREV
1753 #undef MASK
1754 #undef MASK2
1755 #undef MASK3
1756 #undef MASK4
1757 #undef STATE_SET
1758 #undef STATE_TEST
1759 #undef STATE_SET_TEST
1760 #undef SWITCH_STATE
1761 }
1762
1763 /*
1764 * Called by xfs_bmap_add_extent to handle cases converting a hole
1765 * to a delayed allocation.
1766 */
1767 /*ARGSUSED*/
1768 STATIC int /* error */
1769 xfs_bmap_add_extent_hole_delay(
1770 xfs_inode_t *ip, /* incore inode pointer */
1771 xfs_extnum_t idx, /* extent number to update/insert */
1772 xfs_btree_cur_t *cur, /* if null, not a btree */
1773 xfs_bmbt_irec_t *new, /* new data to put in extent list */
1774 int *logflagsp, /* inode logging flags */
1775 int rsvd) /* OK to allocate reserved blocks */
1776 {
1777 xfs_bmbt_rec_t *base; /* base of extent entry list */
1778 xfs_bmbt_rec_t *ep; /* extent list entry for idx */
1779 #ifdef XFS_BMAP_TRACE
1780 static char fname[] = "xfs_bmap_add_extent_hole_delay";
1781 #endif
1782 xfs_bmbt_irec_t left; /* left neighbor extent entry */
1783 xfs_filblks_t newlen=0; /* new indirect size */
1784 xfs_filblks_t oldlen=0; /* old indirect size */
1785 xfs_bmbt_irec_t right; /* right neighbor extent entry */
1786 int state; /* state bits, accessed thru macros */
1787 xfs_filblks_t temp; /* temp for indirect calculations */
1788 enum { /* bit number definitions for state */
1789 LEFT_CONTIG, RIGHT_CONTIG,
1790 LEFT_DELAY, RIGHT_DELAY,
1791 LEFT_VALID, RIGHT_VALID
1792 };
1793
1794 #define MASK(b) (1 << (b))
1795 #define MASK2(a,b) (MASK(a) | MASK(b))
1796 #define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
1797 #define STATE_TEST(b) (state & MASK(b))
1798 #define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
1799 ((state &= ~MASK(b)), 0))
1800 #define SWITCH_STATE (state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
1801
1802 base = ip->i_df.if_u1.if_extents;
1803 ep = &base[idx];
1804 state = 0;
1805 ASSERT(ISNULLSTARTBLOCK(new->br_startblock));
1806 /*
1807 * Check and set flags if this segment has a left neighbor
1808 */
1809 if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
1810 xfs_bmbt_get_all(ep - 1, &left);
1811 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
1812 }
1813 /*
1814 * Check and set flags if the current (right) segment exists.
1815 * If it doesn't exist, we're converting the hole at end-of-file.
1816 */
1817 if (STATE_SET_TEST(RIGHT_VALID,
1818 idx <
1819 ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
1820 xfs_bmbt_get_all(ep, &right);
1821 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
1822 }
1823 /*
1824 * Set contiguity flags on the left and right neighbors.
1825 * Don't let extents get too large, even if the pieces are contiguous.
1826 */
1827 STATE_SET(LEFT_CONTIG,
1828 STATE_TEST(LEFT_VALID) && STATE_TEST(LEFT_DELAY) &&
1829 left.br_startoff + left.br_blockcount == new->br_startoff &&
1830 left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
1831 STATE_SET(RIGHT_CONTIG,
1832 STATE_TEST(RIGHT_VALID) && STATE_TEST(RIGHT_DELAY) &&
1833 new->br_startoff + new->br_blockcount == right.br_startoff &&
1834 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
1835 (!STATE_TEST(LEFT_CONTIG) ||
1836 (left.br_blockcount + new->br_blockcount +
1837 right.br_blockcount <= MAXEXTLEN)));
1838 /*
1839 * Switch out based on the contiguity flags.
1840 */
1841 switch (SWITCH_STATE) {
1842
1843 case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
1844 /*
1845 * New allocation is contiguous with delayed allocations
1846 * on the left and on the right.
1847 * Merge all three into a single extent list entry.
1848 */
1849 temp = left.br_blockcount + new->br_blockcount +
1850 right.br_blockcount;
1851 xfs_bmap_trace_pre_update(fname, "LC|RC", ip, idx - 1,
1852 XFS_DATA_FORK);
1853 xfs_bmbt_set_blockcount(ep - 1, temp);
1854 oldlen = STARTBLOCKVAL(left.br_startblock) +
1855 STARTBLOCKVAL(new->br_startblock) +
1856 STARTBLOCKVAL(right.br_startblock);
1857 newlen = xfs_bmap_worst_indlen(ip, temp);
1858 xfs_bmbt_set_startblock(ep - 1, NULLSTARTBLOCK((int)newlen));
1859 xfs_bmap_trace_post_update(fname, "LC|RC", ip, idx - 1,
1860 XFS_DATA_FORK);
1861 xfs_bmap_trace_delete(fname, "LC|RC", ip, idx, 1,
1862 XFS_DATA_FORK);
1863 xfs_bmap_delete_exlist(ip, idx, 1, XFS_DATA_FORK);
1864 ip->i_df.if_lastex = idx - 1;
1865 break;
1866
1867 case MASK(LEFT_CONTIG):
1868 /*
1869 * New allocation is contiguous with a delayed allocation
1870 * on the left.
1871 * Merge the new allocation with the left neighbor.
1872 */
1873 temp = left.br_blockcount + new->br_blockcount;
1874 xfs_bmap_trace_pre_update(fname, "LC", ip, idx - 1,
1875 XFS_DATA_FORK);
1876 xfs_bmbt_set_blockcount(ep - 1, temp);
1877 oldlen = STARTBLOCKVAL(left.br_startblock) +
1878 STARTBLOCKVAL(new->br_startblock);
1879 newlen = xfs_bmap_worst_indlen(ip, temp);
1880 xfs_bmbt_set_startblock(ep - 1, NULLSTARTBLOCK((int)newlen));
1881 xfs_bmap_trace_post_update(fname, "LC", ip, idx - 1,
1882 XFS_DATA_FORK);
1883 ip->i_df.if_lastex = idx - 1;
1884 break;
1885
1886 case MASK(RIGHT_CONTIG):
1887 /*
1888 * New allocation is contiguous with a delayed allocation
1889 * on the right.
1890 * Merge the new allocation with the right neighbor.
1891 */
1892 xfs_bmap_trace_pre_update(fname, "RC", ip, idx, XFS_DATA_FORK);
1893 temp = new->br_blockcount + right.br_blockcount;
1894 oldlen = STARTBLOCKVAL(new->br_startblock) +
1895 STARTBLOCKVAL(right.br_startblock);
1896 newlen = xfs_bmap_worst_indlen(ip, temp);
1897 xfs_bmbt_set_allf(ep, new->br_startoff,
1898 NULLSTARTBLOCK((int)newlen), temp, right.br_state);
1899 xfs_bmap_trace_post_update(fname, "RC", ip, idx, XFS_DATA_FORK);
1900 ip->i_df.if_lastex = idx;
1901 break;
1902
1903 case 0:
1904 /*
1905 * New allocation is not contiguous with another
1906 * delayed allocation.
1907 * Insert a new entry.
1908 */
1909 oldlen = newlen = 0;
1910 xfs_bmap_trace_insert(fname, "0", ip, idx, 1, new, NULL,
1911 XFS_DATA_FORK);
1912 xfs_bmap_insert_exlist(ip, idx, 1, new, XFS_DATA_FORK);
1913 ip->i_df.if_lastex = idx;
1914 break;
1915 }
1916 if (oldlen != newlen) {
1917 ASSERT(oldlen > newlen);
1918 xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
1919 (int)(oldlen - newlen), rsvd);
1920 /*
1921 * Nothing to do for disk quota accounting here.
1922 */
1923 }
1924 *logflagsp = 0;
1925 return 0;
1926 #undef MASK
1927 #undef MASK2
1928 #undef STATE_SET
1929 #undef STATE_TEST
1930 #undef STATE_SET_TEST
1931 #undef SWITCH_STATE
1932 }
1933
1934 /*
1935 * Called by xfs_bmap_add_extent to handle cases converting a hole
1936 * to a real allocation.
1937 */
1938 STATIC int /* error */
1939 xfs_bmap_add_extent_hole_real(
1940 xfs_inode_t *ip, /* incore inode pointer */
1941 xfs_extnum_t idx, /* extent number to update/insert */
1942 xfs_btree_cur_t *cur, /* if null, not a btree */
1943 xfs_bmbt_irec_t *new, /* new data to put in extent list */
1944 int *logflagsp, /* inode logging flags */
1945 int whichfork) /* data or attr fork */
1946 {
1947 xfs_bmbt_rec_t *ep; /* pointer to extent entry ins. point */
1948 int error; /* error return value */
1949 #ifdef XFS_BMAP_TRACE
1950 static char fname[] = "xfs_bmap_add_extent_hole_real";
1951 #endif
1952 int i; /* temp state */
1953 xfs_ifork_t *ifp; /* inode fork pointer */
1954 xfs_bmbt_irec_t left; /* left neighbor extent entry */
1955 xfs_bmbt_irec_t right; /* right neighbor extent entry */
1956 int state; /* state bits, accessed thru macros */
1957 enum { /* bit number definitions for state */
1958 LEFT_CONTIG, RIGHT_CONTIG,
1959 LEFT_DELAY, RIGHT_DELAY,
1960 LEFT_VALID, RIGHT_VALID
1961 };
1962
1963 #define MASK(b) (1 << (b))
1964 #define MASK2(a,b) (MASK(a) | MASK(b))
1965 #define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
1966 #define STATE_TEST(b) (state & MASK(b))
1967 #define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
1968 ((state &= ~MASK(b)), 0))
1969 #define SWITCH_STATE (state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
1970
1971 ifp = XFS_IFORK_PTR(ip, whichfork);
1972 ASSERT(idx <= ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
1973 ep = &ifp->if_u1.if_extents[idx];
1974 state = 0;
1975 /*
1976 * Check and set flags if this segment has a left neighbor.
1977 */
1978 if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
1979 xfs_bmbt_get_all(ep - 1, &left);
1980 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
1981 }
1982 /*
1983 * Check and set flags if this segment has a current value.
1984 * Not true if we're inserting into the "hole" at eof.
1985 */
1986 if (STATE_SET_TEST(RIGHT_VALID,
1987 idx <
1988 ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
1989 xfs_bmbt_get_all(ep, &right);
1990 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
1991 }
1992 /*
1993 * We're inserting a real allocation between "left" and "right".
1994 * Set the contiguity flags. Don't let extents get too large.
1995 */
1996 STATE_SET(LEFT_CONTIG,
1997 STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
1998 left.br_startoff + left.br_blockcount == new->br_startoff &&
1999 left.br_startblock + left.br_blockcount == new->br_startblock &&
2000 left.br_state == new->br_state &&
2001 left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
2002 STATE_SET(RIGHT_CONTIG,
2003 STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
2004 new->br_startoff + new->br_blockcount == right.br_startoff &&
2005 new->br_startblock + new->br_blockcount ==
2006 right.br_startblock &&
2007 new->br_state == right.br_state &&
2008 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
2009 (!STATE_TEST(LEFT_CONTIG) ||
2010 left.br_blockcount + new->br_blockcount +
2011 right.br_blockcount <= MAXEXTLEN));
2012
2013 /*
2014 * Select which case we're in here, and implement it.
2015 */
2016 switch (SWITCH_STATE) {
2017
2018 case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
2019 /*
2020 * New allocation is contiguous with real allocations on the
2021 * left and on the right.
2022 * Merge all three into a single extent list entry.
2023 */
2024 xfs_bmap_trace_pre_update(fname, "LC|RC", ip, idx - 1,
2025 whichfork);
2026 xfs_bmbt_set_blockcount(ep - 1,
2027 left.br_blockcount + new->br_blockcount +
2028 right.br_blockcount);
2029 xfs_bmap_trace_post_update(fname, "LC|RC", ip, idx - 1,
2030 whichfork);
2031 xfs_bmap_trace_delete(fname, "LC|RC", ip,
2032 idx, 1, whichfork);
2033 xfs_bmap_delete_exlist(ip, idx, 1, whichfork);
2034 ifp->if_lastex = idx - 1;
2035 XFS_IFORK_NEXT_SET(ip, whichfork,
2036 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
2037 if (cur == NULL) {
2038 *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
2039 return 0;
2040 }
2041 *logflagsp = XFS_ILOG_CORE;
2042 if ((error = xfs_bmbt_lookup_eq(cur, right.br_startoff,
2043 right.br_startblock, right.br_blockcount, &i)))
2044 return error;
2045 ASSERT(i == 1);
2046 if ((error = xfs_bmbt_delete(cur, &i)))
2047 return error;
2048 ASSERT(i == 1);
2049 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
2050 return error;
2051 ASSERT(i == 1);
2052 error = xfs_bmbt_update(cur, left.br_startoff,
2053 left.br_startblock,
2054 left.br_blockcount + new->br_blockcount +
2055 right.br_blockcount, left.br_state);
2056 return error;
2057
2058 case MASK(LEFT_CONTIG):
2059 /*
2060 * New allocation is contiguous with a real allocation
2061 * on the left.
2062 * Merge the new allocation with the left neighbor.
2063 */
2064 xfs_bmap_trace_pre_update(fname, "LC", ip, idx - 1, whichfork);
2065 xfs_bmbt_set_blockcount(ep - 1,
2066 left.br_blockcount + new->br_blockcount);
2067 xfs_bmap_trace_post_update(fname, "LC", ip, idx - 1, whichfork);
2068 ifp->if_lastex = idx - 1;
2069 if (cur == NULL) {
2070 *logflagsp = XFS_ILOG_FEXT(whichfork);
2071 return 0;
2072 }
2073 *logflagsp = 0;
2074 if ((error = xfs_bmbt_lookup_eq(cur, left.br_startoff,
2075 left.br_startblock, left.br_blockcount, &i)))
2076 return error;
2077 ASSERT(i == 1);
2078 error = xfs_bmbt_update(cur, left.br_startoff,
2079 left.br_startblock,
2080 left.br_blockcount + new->br_blockcount,
2081 left.br_state);
2082 return error;
2083
2084 case MASK(RIGHT_CONTIG):
2085 /*
2086 * New allocation is contiguous with a real allocation
2087 * on the right.
2088 * Merge the new allocation with the right neighbor.
2089 */
2090 xfs_bmap_trace_pre_update(fname, "RC", ip, idx, whichfork);
2091 xfs_bmbt_set_allf(ep, new->br_startoff, new->br_startblock,
2092 new->br_blockcount + right.br_blockcount,
2093 right.br_state);
2094 xfs_bmap_trace_post_update(fname, "RC", ip, idx, whichfork);
2095 ifp->if_lastex = idx;
2096 if (cur == NULL) {
2097 *logflagsp = XFS_ILOG_FEXT(whichfork);
2098 return 0;
2099 }
2100 *logflagsp = 0;
2101 if ((error = xfs_bmbt_lookup_eq(cur, right.br_startoff,
2102 right.br_startblock, right.br_blockcount, &i)))
2103 return error;
2104 ASSERT(i == 1);
2105 error = xfs_bmbt_update(cur, new->br_startoff,
2106 new->br_startblock,
2107 new->br_blockcount + right.br_blockcount,
2108 right.br_state);
2109 return error;
2110
2111 case 0:
2112 /*
2113 * New allocation is not contiguous with another
2114 * real allocation.
2115 * Insert a new entry.
2116 */
2117 xfs_bmap_trace_insert(fname, "0", ip, idx, 1, new, NULL,
2118 whichfork);
2119 xfs_bmap_insert_exlist(ip, idx, 1, new, whichfork);
2120 ifp->if_lastex = idx;
2121 XFS_IFORK_NEXT_SET(ip, whichfork,
2122 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
2123 if (cur == NULL) {
2124 *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
2125 return 0;
2126 }
2127 *logflagsp = XFS_ILOG_CORE;
2128 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
2129 new->br_startblock, new->br_blockcount, &i)))
2130 return error;
2131 ASSERT(i == 0);
2132 cur->bc_rec.b.br_state = new->br_state;
2133 if ((error = xfs_bmbt_insert(cur, &i)))
2134 return error;
2135 ASSERT(i == 1);
2136 return 0;
2137 }
2138 #undef MASK
2139 #undef MASK2
2140 #undef STATE_SET
2141 #undef STATE_TEST
2142 #undef STATE_SET_TEST
2143 #undef SWITCH_STATE
2144 /* NOTREACHED */
2145 ASSERT(0);
2146 return 0; /* keep gcc quite */
2147 }
2148
2149 /*
2150 * Adjust the size of the new extent based on di_extsize and rt extsize.
2151 */
2152 STATIC int
2153 xfs_bmap_extsize_align(
2154 xfs_mount_t *mp,
2155 xfs_bmbt_irec_t *gotp, /* next extent pointer */
2156 xfs_bmbt_irec_t *prevp, /* previous extent pointer */
2157 xfs_extlen_t extsz, /* align to this extent size */
2158 int rt, /* is this a realtime inode? */
2159 int eof, /* is extent at end-of-file? */
2160 int delay, /* creating delalloc extent? */
2161 int convert, /* overwriting unwritten extent? */
2162 xfs_fileoff_t *offp, /* in/out: aligned offset */
2163 xfs_extlen_t *lenp) /* in/out: aligned length */
2164 {
2165 xfs_fileoff_t orig_off; /* original offset */
2166 xfs_extlen_t orig_alen; /* original length */
2167 xfs_fileoff_t orig_end; /* original off+len */
2168 xfs_fileoff_t nexto; /* next file offset */
2169 xfs_fileoff_t prevo; /* previous file offset */
2170 xfs_fileoff_t align_off; /* temp for offset */
2171 xfs_extlen_t align_alen; /* temp for length */
2172 xfs_extlen_t temp; /* temp for calculations */
2173
2174 if (convert)
2175 return 0;
2176
2177 orig_off = align_off = *offp;
2178 orig_alen = align_alen = *lenp;
2179 orig_end = orig_off + orig_alen;
2180
2181 /*
2182 * If this request overlaps an existing extent, then don't
2183 * attempt to perform any additional alignment.
2184 */
2185 if (!delay && !eof &&
2186 (orig_off >= gotp->br_startoff) &&
2187 (orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
2188 return 0;
2189 }
2190
2191 /*
2192 * If the file offset is unaligned vs. the extent size
2193 * we need to align it. This will be possible unless
2194 * the file was previously written with a kernel that didn't
2195 * perform this alignment, or if a truncate shot us in the
2196 * foot.
2197 */
2198 temp = do_mod(orig_off, extsz);
2199 if (temp) {
2200 align_alen += temp;
2201 align_off -= temp;
2202 }
2203 /*
2204 * Same adjustment for the end of the requested area.
2205 */
2206 if ((temp = (align_alen % extsz))) {
2207 align_alen += extsz - temp;
2208 }
2209 /*
2210 * If the previous block overlaps with this proposed allocation
2211 * then move the start forward without adjusting the length.
2212 */
2213 if (prevp->br_startoff != NULLFILEOFF) {
2214 if (prevp->br_startblock == HOLESTARTBLOCK)
2215 prevo = prevp->br_startoff;
2216 else
2217 prevo = prevp->br_startoff + prevp->br_blockcount;
2218 } else
2219 prevo = 0;
2220 if (align_off != orig_off && align_off < prevo)
2221 align_off = prevo;
2222 /*
2223 * If the next block overlaps with this proposed allocation
2224 * then move the start back without adjusting the length,
2225 * but not before offset 0.
2226 * This may of course make the start overlap previous block,
2227 * and if we hit the offset 0 limit then the next block
2228 * can still overlap too.
2229 */
2230 if (!eof && gotp->br_startoff != NULLFILEOFF) {
2231 if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
2232 (!delay && gotp->br_startblock == DELAYSTARTBLOCK))
2233 nexto = gotp->br_startoff + gotp->br_blockcount;
2234 else
2235 nexto = gotp->br_startoff;
2236 } else
2237 nexto = NULLFILEOFF;
2238 if (!eof &&
2239 align_off + align_alen != orig_end &&
2240 align_off + align_alen > nexto)
2241 align_off = nexto > align_alen ? nexto - align_alen : 0;
2242 /*
2243 * If we're now overlapping the next or previous extent that
2244 * means we can't fit an extsz piece in this hole. Just move
2245 * the start forward to the first valid spot and set
2246 * the length so we hit the end.
2247 */
2248 if (align_off != orig_off && align_off < prevo)
2249 align_off = prevo;
2250 if (align_off + align_alen != orig_end &&
2251 align_off + align_alen > nexto &&
2252 nexto != NULLFILEOFF) {
2253 ASSERT(nexto > prevo);
2254 align_alen = nexto - align_off;
2255 }
2256
2257 /*
2258 * If realtime, and the result isn't a multiple of the realtime
2259 * extent size we need to remove blocks until it is.
2260 */
2261 if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
2262 /*
2263 * We're not covering the original request, or
2264 * we won't be able to once we fix the length.
2265 */
2266 if (orig_off < align_off ||
2267 orig_end > align_off + align_alen ||
2268 align_alen - temp < orig_alen)
2269 return XFS_ERROR(EINVAL);
2270 /*
2271 * Try to fix it by moving the start up.
2272 */
2273 if (align_off + temp <= orig_off) {
2274 align_alen -= temp;
2275 align_off += temp;
2276 }
2277 /*
2278 * Try to fix it by moving the end in.
2279 */
2280 else if (align_off + align_alen - temp >= orig_end)
2281 align_alen -= temp;
2282 /*
2283 * Set the start to the minimum then trim the length.
2284 */
2285 else {
2286 align_alen -= orig_off - align_off;
2287 align_off = orig_off;
2288 align_alen -= align_alen % mp->m_sb.sb_rextsize;
2289 }
2290 /*
2291 * Result doesn't cover the request, fail it.
2292 */
2293 if (orig_off < align_off || orig_end > align_off + align_alen)
2294 return XFS_ERROR(EINVAL);
2295 } else {
2296 ASSERT(orig_off >= align_off);
2297 ASSERT(orig_end <= align_off + align_alen);
2298 }
2299
2300 #ifdef DEBUG
2301 if (!eof && gotp->br_startoff != NULLFILEOFF)
2302 ASSERT(align_off + align_alen <= gotp->br_startoff);
2303 if (prevp->br_startoff != NULLFILEOFF)
2304 ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
2305 #endif
2306
2307 *lenp = align_alen;
2308 *offp = align_off;
2309 return 0;
2310 }
2311
2312 #define XFS_ALLOC_GAP_UNITS 4
2313
2314 /*
2315 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
2316 * It figures out where to ask the underlying allocator to put the new extent.
2317 */
2318 STATIC int
2319 xfs_bmap_alloc(
2320 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2321 {
2322 xfs_fsblock_t adjust; /* adjustment to block numbers */
2323 xfs_alloctype_t atype=0; /* type for allocation routines */
2324 int error; /* error return value */
2325 xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
2326 xfs_mount_t *mp; /* mount point structure */
2327 int nullfb; /* true if ap->firstblock isn't set */
2328 int rt; /* true if inode is realtime */
2329 xfs_extlen_t prod = 0; /* product factor for allocators */
2330 xfs_extlen_t ralen = 0; /* realtime allocation length */
2331 xfs_extlen_t align; /* minimum allocation alignment */
2332 xfs_rtblock_t rtx;
2333
2334 #define ISVALID(x,y) \
2335 (rt ? \
2336 (x) < mp->m_sb.sb_rblocks : \
2337 XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
2338 XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
2339 XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
2340
2341 /*
2342 * Set up variables.
2343 */
2344 mp = ap->ip->i_mount;
2345 nullfb = ap->firstblock == NULLFSBLOCK;
2346 rt = XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata;
2347 fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
2348 if (rt) {
2349 align = ap->ip->i_d.di_extsize ?
2350 ap->ip->i_d.di_extsize : mp->m_sb.sb_rextsize;
2351 /* Set prod to match the extent size */
2352 prod = align / mp->m_sb.sb_rextsize;
2353
2354 error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
2355 align, rt, ap->eof, 0,
2356 ap->conv, &ap->off, &ap->alen);
2357 if (error)
2358 return error;
2359 ASSERT(ap->alen);
2360 ASSERT(ap->alen % mp->m_sb.sb_rextsize == 0);
2361
2362 /*
2363 * If the offset & length are not perfectly aligned
2364 * then kill prod, it will just get us in trouble.
2365 */
2366 if (do_mod(ap->off, align) || ap->alen % align)
2367 prod = 1;
2368 /*
2369 * Set ralen to be the actual requested length in rtextents.
2370 */
2371 ralen = ap->alen / mp->m_sb.sb_rextsize;
2372 /*
2373 * If the old value was close enough to MAXEXTLEN that
2374 * we rounded up to it, cut it back so it's valid again.
2375 * Note that if it's a really large request (bigger than
2376 * MAXEXTLEN), we don't hear about that number, and can't
2377 * adjust the starting point to match it.
2378 */
2379 if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
2380 ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
2381 /*
2382 * If it's an allocation to an empty file at offset 0,
2383 * pick an extent that will space things out in the rt area.
2384 */
2385 if (ap->eof && ap->off == 0) {
2386 error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
2387 if (error)
2388 return error;
2389 ap->rval = rtx * mp->m_sb.sb_rextsize;
2390 } else
2391 ap->rval = 0;
2392 } else {
2393 align = (ap->userdata && ap->ip->i_d.di_extsize &&
2394 (ap->ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)) ?
2395 ap->ip->i_d.di_extsize : 0;
2396 if (unlikely(align)) {
2397 error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
2398 align, rt,
2399 ap->eof, 0, ap->conv,
2400 &ap->off, &ap->alen);
2401 ASSERT(!error);
2402 ASSERT(ap->alen);
2403 }
2404 if (nullfb)
2405 ap->rval = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
2406 else
2407 ap->rval = ap->firstblock;
2408 }
2409
2410 /*
2411 * If allocating at eof, and there's a previous real block,
2412 * try to use it's last block as our starting point.
2413 */
2414 if (ap->eof && ap->prevp->br_startoff != NULLFILEOFF &&
2415 !ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
2416 ISVALID(ap->prevp->br_startblock + ap->prevp->br_blockcount,
2417 ap->prevp->br_startblock)) {
2418 ap->rval = ap->prevp->br_startblock + ap->prevp->br_blockcount;
2419 /*
2420 * Adjust for the gap between prevp and us.
2421 */
2422 adjust = ap->off -
2423 (ap->prevp->br_startoff + ap->prevp->br_blockcount);
2424 if (adjust &&
2425 ISVALID(ap->rval + adjust, ap->prevp->br_startblock))
2426 ap->rval += adjust;
2427 }
2428 /*
2429 * If not at eof, then compare the two neighbor blocks.
2430 * Figure out whether either one gives us a good starting point,
2431 * and pick the better one.
2432 */
2433 else if (!ap->eof) {
2434 xfs_fsblock_t gotbno; /* right side block number */
2435 xfs_fsblock_t gotdiff=0; /* right side difference */
2436 xfs_fsblock_t prevbno; /* left side block number */
2437 xfs_fsblock_t prevdiff=0; /* left side difference */
2438
2439 /*
2440 * If there's a previous (left) block, select a requested
2441 * start block based on it.
2442 */
2443 if (ap->prevp->br_startoff != NULLFILEOFF &&
2444 !ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
2445 (prevbno = ap->prevp->br_startblock +
2446 ap->prevp->br_blockcount) &&
2447 ISVALID(prevbno, ap->prevp->br_startblock)) {
2448 /*
2449 * Calculate gap to end of previous block.
2450 */
2451 adjust = prevdiff = ap->off -
2452 (ap->prevp->br_startoff +
2453 ap->prevp->br_blockcount);
2454 /*
2455 * Figure the startblock based on the previous block's
2456 * end and the gap size.
2457 * Heuristic!
2458 * If the gap is large relative to the piece we're
2459 * allocating, or using it gives us an invalid block
2460 * number, then just use the end of the previous block.
2461 */
2462 if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
2463 ISVALID(prevbno + prevdiff,
2464 ap->prevp->br_startblock))
2465 prevbno += adjust;
2466 else
2467 prevdiff += adjust;
2468 /*
2469 * If the firstblock forbids it, can't use it,
2470 * must use default.
2471 */
2472 if (!rt && !nullfb &&
2473 XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
2474 prevbno = NULLFSBLOCK;
2475 }
2476 /*
2477 * No previous block or can't follow it, just default.
2478 */
2479 else
2480 prevbno = NULLFSBLOCK;
2481 /*
2482 * If there's a following (right) block, select a requested
2483 * start block based on it.
2484 */
2485 if (!ISNULLSTARTBLOCK(ap->gotp->br_startblock)) {
2486 /*
2487 * Calculate gap to start of next block.
2488 */
2489 adjust = gotdiff = ap->gotp->br_startoff - ap->off;
2490 /*
2491 * Figure the startblock based on the next block's
2492 * start and the gap size.
2493 */
2494 gotbno = ap->gotp->br_startblock;
2495 /*
2496 * Heuristic!
2497 * If the gap is large relative to the piece we're
2498 * allocating, or using it gives us an invalid block
2499 * number, then just use the start of the next block
2500 * offset by our length.
2501 */
2502 if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
2503 ISVALID(gotbno - gotdiff, gotbno))
2504 gotbno -= adjust;
2505 else if (ISVALID(gotbno - ap->alen, gotbno)) {
2506 gotbno -= ap->alen;
2507 gotdiff += adjust - ap->alen;
2508 } else
2509 gotdiff += adjust;
2510 /*
2511 * If the firstblock forbids it, can't use it,
2512 * must use default.
2513 */
2514 if (!rt && !nullfb &&
2515 XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
2516 gotbno = NULLFSBLOCK;
2517 }
2518 /*
2519 * No next block, just default.
2520 */
2521 else
2522 gotbno = NULLFSBLOCK;
2523 /*
2524 * If both valid, pick the better one, else the only good
2525 * one, else ap->rval is already set (to 0 or the inode block).
2526 */
2527 if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
2528 ap->rval = prevdiff <= gotdiff ? prevbno : gotbno;
2529 else if (prevbno != NULLFSBLOCK)
2530 ap->rval = prevbno;
2531 else if (gotbno != NULLFSBLOCK)
2532 ap->rval = gotbno;
2533 }
2534 /*
2535 * If allowed, use ap->rval; otherwise must use firstblock since
2536 * it's in the right allocation group.
2537 */
2538 if (nullfb || rt || XFS_FSB_TO_AGNO(mp, ap->rval) == fb_agno)
2539 ;
2540 else
2541 ap->rval = ap->firstblock;
2542 /*
2543 * Realtime allocation, done through xfs_rtallocate_extent.
2544 */
2545 if (rt) {
2546 #ifndef __KERNEL__
2547 ASSERT(0);
2548 #else
2549 xfs_rtblock_t rtb;
2550
2551 atype = ap->rval == 0 ?
2552 XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
2553 do_div(ap->rval, mp->m_sb.sb_rextsize);
2554 rtb = ap->rval;
2555 ap->alen = ralen;
2556 if ((error = xfs_rtallocate_extent(ap->tp, ap->rval, 1, ap->alen,
2557 &ralen, atype, ap->wasdel, prod, &rtb)))
2558 return error;
2559 if (rtb == NULLFSBLOCK && prod > 1 &&
2560 (error = xfs_rtallocate_extent(ap->tp, ap->rval, 1,
2561 ap->alen, &ralen, atype,
2562 ap->wasdel, 1, &rtb)))
2563 return error;
2564 ap->rval = rtb;
2565 if (ap->rval != NULLFSBLOCK) {
2566 ap->rval *= mp->m_sb.sb_rextsize;
2567 ralen *= mp->m_sb.sb_rextsize;
2568 ap->alen = ralen;
2569 ap->ip->i_d.di_nblocks += ralen;
2570 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2571 if (ap->wasdel)
2572 ap->ip->i_delayed_blks -= ralen;
2573 /*
2574 * Adjust the disk quota also. This was reserved
2575 * earlier.
2576 */
2577 XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
2578 ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
2579 XFS_TRANS_DQ_RTBCOUNT,
2580 (long) ralen);
2581 } else
2582 ap->alen = 0;
2583 #endif /* __KERNEL__ */
2584 }
2585 /*
2586 * Normal allocation, done through xfs_alloc_vextent.
2587 */
2588 else {
2589 xfs_agnumber_t ag;
2590 xfs_alloc_arg_t args;
2591 xfs_extlen_t blen;
2592 xfs_extlen_t delta;
2593 int isaligned;
2594 xfs_extlen_t longest;
2595 xfs_extlen_t need;
2596 xfs_extlen_t nextminlen=0;
2597 int notinit;
2598 xfs_perag_t *pag;
2599 xfs_agnumber_t startag;
2600 int tryagain;
2601
2602 tryagain = isaligned = 0;
2603 args.tp = ap->tp;
2604 args.mp = mp;
2605 args.fsbno = ap->rval;
2606 args.maxlen = MIN(ap->alen, mp->m_sb.sb_agblocks);
2607 blen = 0;
2608 if (nullfb) {
2609 args.type = XFS_ALLOCTYPE_START_BNO;
2610 args.total = ap->total;
2611 /*
2612 * Find the longest available space.
2613 * We're going to try for the whole allocation at once.
2614 */
2615 startag = ag = XFS_FSB_TO_AGNO(mp, args.fsbno);
2616 notinit = 0;
2617 down_read(&mp->m_peraglock);
2618 while (blen < ap->alen) {
2619 pag = &mp->m_perag[ag];
2620 if (!pag->pagf_init &&
2621 (error = xfs_alloc_pagf_init(mp, args.tp,
2622 ag, XFS_ALLOC_FLAG_TRYLOCK))) {
2623 up_read(&mp->m_peraglock);
2624 return error;
2625 }
2626 /*
2627 * See xfs_alloc_fix_freelist...
2628 */
2629 if (pag->pagf_init) {
2630 need = XFS_MIN_FREELIST_PAG(pag, mp);
2631 delta = need > pag->pagf_flcount ?
2632 need - pag->pagf_flcount : 0;
2633 longest = (pag->pagf_longest > delta) ?
2634 (pag->pagf_longest - delta) :
2635 (pag->pagf_flcount > 0 ||
2636 pag->pagf_longest > 0);
2637 if (blen < longest)
2638 blen = longest;
2639 } else
2640 notinit = 1;
2641 if (++ag == mp->m_sb.sb_agcount)
2642 ag = 0;
2643 if (ag == startag)
2644 break;
2645 }
2646 up_read(&mp->m_peraglock);
2647 /*
2648 * Since the above loop did a BUF_TRYLOCK, it is
2649 * possible that there is space for this request.
2650 */
2651 if (notinit || blen < ap->minlen)
2652 args.minlen = ap->minlen;
2653 /*
2654 * If the best seen length is less than the request
2655 * length, use the best as the minimum.
2656 */
2657 else if (blen < ap->alen)
2658 args.minlen = blen;
2659 /*
2660 * Otherwise we've seen an extent as big as alen,
2661 * use that as the minimum.
2662 */
2663 else
2664 args.minlen = ap->alen;
2665 } else if (ap->low) {
2666 args.type = XFS_ALLOCTYPE_FIRST_AG;
2667 args.total = args.minlen = ap->minlen;
2668 } else {
2669 args.type = XFS_ALLOCTYPE_NEAR_BNO;
2670 args.total = ap->total;
2671 args.minlen = ap->minlen;
2672 }
2673 if (unlikely(ap->userdata && ap->ip->i_d.di_extsize &&
2674 (ap->ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE))) {
2675 args.prod = ap->ip->i_d.di_extsize;
2676 if ((args.mod = (xfs_extlen_t)do_mod(ap->off, args.prod)))
2677 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2678 } else if (unlikely(mp->m_sb.sb_blocksize >= NBPP)) {
2679 args.prod = 1;
2680 args.mod = 0;
2681 } else {
2682 args.prod = NBPP >> mp->m_sb.sb_blocklog;
2683 if ((args.mod = (xfs_extlen_t)(do_mod(ap->off, args.prod))))
2684 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2685 }
2686 /*
2687 * If we are not low on available data blocks, and the
2688 * underlying logical volume manager is a stripe, and
2689 * the file offset is zero then try to allocate data
2690 * blocks on stripe unit boundary.
2691 * NOTE: ap->aeof is only set if the allocation length
2692 * is >= the stripe unit and the allocation offset is
2693 * at the end of file.
2694 */
2695 if (!ap->low && ap->aeof) {
2696 if (!ap->off) {
2697 args.alignment = mp->m_dalign;
2698 atype = args.type;
2699 isaligned = 1;
2700 /*
2701 * Adjust for alignment
2702 */
2703 if (blen > args.alignment && blen <= ap->alen)
2704 args.minlen = blen - args.alignment;
2705 args.minalignslop = 0;
2706 } else {
2707 /*
2708 * First try an exact bno allocation.
2709 * If it fails then do a near or start bno
2710 * allocation with alignment turned on.
2711 */
2712 atype = args.type;
2713 tryagain = 1;
2714 args.type = XFS_ALLOCTYPE_THIS_BNO;
2715 args.alignment = 1;
2716 /*
2717 * Compute the minlen+alignment for the
2718 * next case. Set slop so that the value
2719 * of minlen+alignment+slop doesn't go up
2720 * between the calls.
2721 */
2722 if (blen > mp->m_dalign && blen <= ap->alen)
2723 nextminlen = blen - mp->m_dalign;
2724 else
2725 nextminlen = args.minlen;
2726 if (nextminlen + mp->m_dalign > args.minlen + 1)
2727 args.minalignslop =
2728 nextminlen + mp->m_dalign -
2729 args.minlen - 1;
2730 else
2731 args.minalignslop = 0;
2732 }
2733 } else {
2734 args.alignment = 1;
2735 args.minalignslop = 0;
2736 }
2737 args.minleft = ap->minleft;
2738 args.wasdel = ap->wasdel;
2739 args.isfl = 0;
2740 args.userdata = ap->userdata;
2741 if ((error = xfs_alloc_vextent(&args)))
2742 return error;
2743 if (tryagain && args.fsbno == NULLFSBLOCK) {
2744 /*
2745 * Exact allocation failed. Now try with alignment
2746 * turned on.
2747 */
2748 args.type = atype;
2749 args.fsbno = ap->rval;
2750 args.alignment = mp->m_dalign;
2751 args.minlen = nextminlen;
2752 args.minalignslop = 0;
2753 isaligned = 1;
2754 if ((error = xfs_alloc_vextent(&args)))
2755 return error;
2756 }
2757 if (isaligned && args.fsbno == NULLFSBLOCK) {
2758 /*
2759 * allocation failed, so turn off alignment and
2760 * try again.
2761 */
2762 args.type = atype;
2763 args.fsbno = ap->rval;
2764 args.alignment = 0;
2765 if ((error = xfs_alloc_vextent(&args)))
2766 return error;
2767 }
2768 if (args.fsbno == NULLFSBLOCK && nullfb &&
2769 args.minlen > ap->minlen) {
2770 args.minlen = ap->minlen;
2771 args.type = XFS_ALLOCTYPE_START_BNO;
2772 args.fsbno = ap->rval;
2773 if ((error = xfs_alloc_vextent(&args)))
2774 return error;
2775 }
2776 if (args.fsbno == NULLFSBLOCK && nullfb) {
2777 args.fsbno = 0;
2778 args.type = XFS_ALLOCTYPE_FIRST_AG;
2779 args.total = ap->minlen;
2780 args.minleft = 0;
2781 if ((error = xfs_alloc_vextent(&args)))
2782 return error;
2783 ap->low = 1;
2784 }
2785 if (args.fsbno != NULLFSBLOCK) {
2786 ap->firstblock = ap->rval = args.fsbno;
2787 ASSERT(nullfb || fb_agno == args.agno ||
2788 (ap->low && fb_agno < args.agno));
2789 ap->alen = args.len;
2790 ap->ip->i_d.di_nblocks += args.len;
2791 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2792 if (ap->wasdel)
2793 ap->ip->i_delayed_blks -= args.len;
2794 /*
2795 * Adjust the disk quota also. This was reserved
2796 * earlier.
2797 */
2798 XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
2799 ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
2800 XFS_TRANS_DQ_BCOUNT,
2801 (long) args.len);
2802 } else {
2803 ap->rval = NULLFSBLOCK;
2804 ap->alen = 0;
2805 }
2806 }
2807 return 0;
2808 #undef ISVALID
2809 }
2810
2811 /*
2812 * Transform a btree format file with only one leaf node, where the
2813 * extents list will fit in the inode, into an extents format file.
2814 * Since the extent list is already in-core, all we have to do is
2815 * give up the space for the btree root and pitch the leaf block.
2816 */
2817 STATIC int /* error */
2818 xfs_bmap_btree_to_extents(
2819 xfs_trans_t *tp, /* transaction pointer */
2820 xfs_inode_t *ip, /* incore inode pointer */
2821 xfs_btree_cur_t *cur, /* btree cursor */
2822 int *logflagsp, /* inode logging flags */
2823 int whichfork) /* data or attr fork */
2824 {
2825 /* REFERENCED */
2826 xfs_bmbt_block_t *cblock;/* child btree block */
2827 xfs_fsblock_t cbno; /* child block number */
2828 xfs_buf_t *cbp; /* child block's buffer */
2829 int error; /* error return value */
2830 xfs_ifork_t *ifp; /* inode fork data */
2831 xfs_mount_t *mp; /* mount point structure */
2832 xfs_bmbt_ptr_t *pp; /* ptr to block address */
2833 xfs_bmbt_block_t *rblock;/* root btree block */
2834
2835 ifp = XFS_IFORK_PTR(ip, whichfork);
2836 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
2837 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
2838 rblock = ifp->if_broot;
2839 ASSERT(be16_to_cpu(rblock->bb_level) == 1);
2840 ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
2841 ASSERT(XFS_BMAP_BROOT_MAXRECS(ifp->if_broot_bytes) == 1);
2842 mp = ip->i_mount;
2843 pp = XFS_BMAP_BROOT_PTR_ADDR(rblock, 1, ifp->if_broot_bytes);
2844 *logflagsp = 0;
2845 #ifdef DEBUG
2846 if ((error = xfs_btree_check_lptr(cur, INT_GET(*pp, ARCH_CONVERT), 1)))
2847 return error;
2848 #endif
2849 cbno = INT_GET(*pp, ARCH_CONVERT);
2850 if ((error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp,
2851 XFS_BMAP_BTREE_REF)))
2852 return error;
2853 cblock = XFS_BUF_TO_BMBT_BLOCK(cbp);
2854 if ((error = xfs_btree_check_lblock(cur, cblock, 0, cbp)))
2855 return error;
2856 xfs_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
2857 ip->i_d.di_nblocks--;
2858 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
2859 xfs_trans_binval(tp, cbp);
2860 if (cur->bc_bufs[0] == cbp)
2861 cur->bc_bufs[0] = NULL;
2862 xfs_iroot_realloc(ip, -1, whichfork);
2863 ASSERT(ifp->if_broot == NULL);
2864 ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
2865 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
2866 *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
2867 return 0;
2868 }
2869
2870 /*
2871 * Called by xfs_bmapi to update extent list structure and the btree
2872 * after removing space (or undoing a delayed allocation).
2873 */
2874 STATIC int /* error */
2875 xfs_bmap_del_extent(
2876 xfs_inode_t *ip, /* incore inode pointer */
2877 xfs_trans_t *tp, /* current transaction pointer */
2878 xfs_extnum_t idx, /* extent number to update/delete */
2879 xfs_bmap_free_t *flist, /* list of extents to be freed */
2880 xfs_btree_cur_t *cur, /* if null, not a btree */
2881 xfs_bmbt_irec_t *del, /* data to remove from extent list */
2882 int *logflagsp, /* inode logging flags */
2883 int whichfork, /* data or attr fork */
2884 int rsvd) /* OK to allocate reserved blocks */
2885 {
2886 xfs_filblks_t da_new; /* new delay-alloc indirect blocks */
2887 xfs_filblks_t da_old; /* old delay-alloc indirect blocks */
2888 xfs_fsblock_t del_endblock=0; /* first block past del */
2889 xfs_fileoff_t del_endoff; /* first offset past del */
2890 int delay; /* current block is delayed allocated */
2891 int do_fx; /* free extent at end of routine */
2892 xfs_bmbt_rec_t *ep; /* current extent entry pointer */
2893 int error; /* error return value */
2894 int flags; /* inode logging flags */
2895 #ifdef XFS_BMAP_TRACE
2896 static char fname[] = "xfs_bmap_del_extent";
2897 #endif
2898 xfs_bmbt_irec_t got; /* current extent entry */
2899 xfs_fileoff_t got_endoff; /* first offset past got */
2900 int i; /* temp state */
2901 xfs_ifork_t *ifp; /* inode fork pointer */
2902 xfs_mount_t *mp; /* mount structure */
2903 xfs_filblks_t nblks; /* quota/sb block count */
2904 xfs_bmbt_irec_t new; /* new record to be inserted */
2905 /* REFERENCED */
2906 xfs_extnum_t nextents; /* number of extents in list */
2907 uint qfield; /* quota field to update */
2908 xfs_filblks_t temp; /* for indirect length calculations */
2909 xfs_filblks_t temp2; /* for indirect length calculations */
2910
2911 XFS_STATS_INC(xs_del_exlist);
2912 mp = ip->i_mount;
2913 ifp = XFS_IFORK_PTR(ip, whichfork);
2914 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
2915 ASSERT(idx >= 0 && idx < nextents);
2916 ASSERT(del->br_blockcount > 0);
2917 ep = &ifp->if_u1.if_extents[idx];
2918 xfs_bmbt_get_all(ep, &got);
2919 ASSERT(got.br_startoff <= del->br_startoff);
2920 del_endoff = del->br_startoff + del->br_blockcount;
2921 got_endoff = got.br_startoff + got.br_blockcount;
2922 ASSERT(got_endoff >= del_endoff);
2923 delay = ISNULLSTARTBLOCK(got.br_startblock);
2924 ASSERT(ISNULLSTARTBLOCK(del->br_startblock) == delay);
2925 flags = 0;
2926 qfield = 0;
2927 error = 0;
2928 /*
2929 * If deleting a real allocation, must free up the disk space.
2930 */
2931 if (!delay) {
2932 flags = XFS_ILOG_CORE;
2933 /*
2934 * Realtime allocation. Free it and record di_nblocks update.
2935 */
2936 if (whichfork == XFS_DATA_FORK &&
2937 (ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
2938 xfs_fsblock_t bno;
2939 xfs_filblks_t len;
2940
2941 ASSERT(do_mod(del->br_blockcount,
2942 mp->m_sb.sb_rextsize) == 0);
2943 ASSERT(do_mod(del->br_startblock,
2944 mp->m_sb.sb_rextsize) == 0);
2945 bno = del->br_startblock;
2946 len = del->br_blockcount;
2947 do_div(bno, mp->m_sb.sb_rextsize);
2948 do_div(len, mp->m_sb.sb_rextsize);
2949 if ((error = xfs_rtfree_extent(ip->i_transp, bno,
2950 (xfs_extlen_t)len)))
2951 goto done;
2952 do_fx = 0;
2953 nblks = len * mp->m_sb.sb_rextsize;
2954 qfield = XFS_TRANS_DQ_RTBCOUNT;
2955 }
2956 /*
2957 * Ordinary allocation.
2958 */
2959 else {
2960 do_fx = 1;
2961 nblks = del->br_blockcount;
2962 qfield = XFS_TRANS_DQ_BCOUNT;
2963 }
2964 /*
2965 * Set up del_endblock and cur for later.
2966 */
2967 del_endblock = del->br_startblock + del->br_blockcount;
2968 if (cur) {
2969 if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
2970 got.br_startblock, got.br_blockcount,
2971 &i)))
2972 goto done;
2973 ASSERT(i == 1);
2974 }
2975 da_old = da_new = 0;
2976 } else {
2977 da_old = STARTBLOCKVAL(got.br_startblock);
2978 da_new = 0;
2979 nblks = 0;
2980 do_fx = 0;
2981 }
2982 /*
2983 * Set flag value to use in switch statement.
2984 * Left-contig is 2, right-contig is 1.
2985 */
2986 switch (((got.br_startoff == del->br_startoff) << 1) |
2987 (got_endoff == del_endoff)) {
2988 case 3:
2989 /*
2990 * Matches the whole extent. Delete the entry.
2991 */
2992 xfs_bmap_trace_delete(fname, "3", ip, idx, 1, whichfork);
2993 xfs_bmap_delete_exlist(ip, idx, 1, whichfork);
2994 ifp->if_lastex = idx;
2995 if (delay)
2996 break;
2997 XFS_IFORK_NEXT_SET(ip, whichfork,
2998 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
2999 flags |= XFS_ILOG_CORE;
3000 if (!cur) {
3001 flags |= XFS_ILOG_FEXT(whichfork);
3002 break;
3003 }
3004 if ((error = xfs_bmbt_delete(cur, &i)))
3005 goto done;
3006 ASSERT(i == 1);
3007 break;
3008
3009 case 2:
3010 /*
3011 * Deleting the first part of the extent.
3012 */
3013 xfs_bmap_trace_pre_update(fname, "2", ip, idx, whichfork);
3014 xfs_bmbt_set_startoff(ep, del_endoff);
3015 temp = got.br_blockcount - del->br_blockcount;
3016 xfs_bmbt_set_blockcount(ep, temp);
3017 ifp->if_lastex = idx;
3018 if (delay) {
3019 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
3020 da_old);
3021 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
3022 xfs_bmap_trace_post_update(fname, "2", ip, idx,
3023 whichfork);
3024 da_new = temp;
3025 break;
3026 }
3027 xfs_bmbt_set_startblock(ep, del_endblock);
3028 xfs_bmap_trace_post_update(fname, "2", ip, idx, whichfork);
3029 if (!cur) {
3030 flags |= XFS_ILOG_FEXT(whichfork);
3031 break;
3032 }
3033 if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
3034 got.br_blockcount - del->br_blockcount,
3035 got.br_state)))
3036 goto done;
3037 break;
3038
3039 case 1:
3040 /*
3041 * Deleting the last part of the extent.
3042 */
3043 temp = got.br_blockcount - del->br_blockcount;
3044 xfs_bmap_trace_pre_update(fname, "1", ip, idx, whichfork);
3045 xfs_bmbt_set_blockcount(ep, temp);
3046 ifp->if_lastex = idx;
3047 if (delay) {
3048 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
3049 da_old);
3050 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
3051 xfs_bmap_trace_post_update(fname, "1", ip, idx,
3052 whichfork);
3053 da_new = temp;
3054 break;
3055 }
3056 xfs_bmap_trace_post_update(fname, "1", ip, idx, whichfork);
3057 if (!cur) {
3058 flags |= XFS_ILOG_FEXT(whichfork);
3059 break;
3060 }
3061 if ((error = xfs_bmbt_update(cur, got.br_startoff,
3062 got.br_startblock,
3063 got.br_blockcount - del->br_blockcount,
3064 got.br_state)))
3065 goto done;
3066 break;
3067
3068 case 0:
3069 /*
3070 * Deleting the middle of the extent.
3071 */
3072 temp = del->br_startoff - got.br_startoff;
3073 xfs_bmap_trace_pre_update(fname, "0", ip, idx, whichfork);
3074 xfs_bmbt_set_blockcount(ep, temp);
3075 new.br_startoff = del_endoff;
3076 temp2 = got_endoff - del_endoff;
3077 new.br_blockcount = temp2;
3078 new.br_state = got.br_state;
3079 if (!delay) {
3080 new.br_startblock = del_endblock;
3081 flags |= XFS_ILOG_CORE;
3082 if (cur) {
3083 if ((error = xfs_bmbt_update(cur,
3084 got.br_startoff,
3085 got.br_startblock, temp,
3086 got.br_state)))
3087 goto done;
3088 if ((error = xfs_bmbt_increment(cur, 0, &i)))
3089 goto done;
3090 cur->bc_rec.b = new;
3091 error = xfs_bmbt_insert(cur, &i);
3092 if (error && error != ENOSPC)
3093 goto done;
3094 /*
3095 * If get no-space back from btree insert,
3096 * it tried a split, and we have a zero
3097 * block reservation.
3098 * Fix up our state and return the error.
3099 */
3100 if (error == ENOSPC) {
3101 /*
3102 * Reset the cursor, don't trust
3103 * it after any insert operation.
3104 */
3105 if ((error = xfs_bmbt_lookup_eq(cur,
3106 got.br_startoff,
3107 got.br_startblock,
3108 temp, &i)))
3109 goto done;
3110 ASSERT(i == 1);
3111 /*
3112 * Update the btree record back
3113 * to the original value.
3114 */
3115 if ((error = xfs_bmbt_update(cur,
3116 got.br_startoff,
3117 got.br_startblock,
3118 got.br_blockcount,
3119 got.br_state)))
3120 goto done;
3121 /*
3122 * Reset the extent record back
3123 * to the original value.
3124 */
3125 xfs_bmbt_set_blockcount(ep,
3126 got.br_blockcount);
3127 flags = 0;
3128 error = XFS_ERROR(ENOSPC);
3129 goto done;
3130 }
3131 ASSERT(i == 1);
3132 } else
3133 flags |= XFS_ILOG_FEXT(whichfork);
3134 XFS_IFORK_NEXT_SET(ip, whichfork,
3135 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
3136 } else {
3137 ASSERT(whichfork == XFS_DATA_FORK);
3138 temp = xfs_bmap_worst_indlen(ip, temp);
3139 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
3140 temp2 = xfs_bmap_worst_indlen(ip, temp2);
3141 new.br_startblock = NULLSTARTBLOCK((int)temp2);
3142 da_new = temp + temp2;
3143 while (da_new > da_old) {
3144 if (temp) {
3145 temp--;
3146 da_new--;
3147 xfs_bmbt_set_startblock(ep,
3148 NULLSTARTBLOCK((int)temp));
3149 }
3150 if (da_new == da_old)
3151 break;
3152 if (temp2) {
3153 temp2--;
3154 da_new--;
3155 new.br_startblock =
3156 NULLSTARTBLOCK((int)temp2);
3157 }
3158 }
3159 }
3160 xfs_bmap_trace_post_update(fname, "0", ip, idx, whichfork);
3161 xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 1, &new, NULL,
3162 whichfork);
3163 xfs_bmap_insert_exlist(ip, idx + 1, 1, &new, whichfork);
3164 ifp->if_lastex = idx + 1;
3165 break;
3166 }
3167 /*
3168 * If we need to, add to list of extents to delete.
3169 */
3170 if (do_fx)
3171 xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
3172 mp);
3173 /*
3174 * Adjust inode # blocks in the file.
3175 */
3176 if (nblks)
3177 ip->i_d.di_nblocks -= nblks;
3178 /*
3179 * Adjust quota data.
3180 */
3181 if (qfield)
3182 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, qfield, (long)-nblks);
3183
3184 /*
3185 * Account for change in delayed indirect blocks.
3186 * Nothing to do for disk quota accounting here.
3187 */
3188 ASSERT(da_old >= da_new);
3189 if (da_old > da_new)
3190 xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, (int)(da_old - da_new),
3191 rsvd);
3192 done:
3193 *logflagsp = flags;
3194 return error;
3195 }
3196
3197 /*
3198 * Remove the entry "free" from the free item list. Prev points to the
3199 * previous entry, unless "free" is the head of the list.
3200 */
3201 STATIC void
3202 xfs_bmap_del_free(
3203 xfs_bmap_free_t *flist, /* free item list header */
3204 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
3205 xfs_bmap_free_item_t *free) /* list item to be freed */
3206 {
3207 if (prev)
3208 prev->xbfi_next = free->xbfi_next;
3209 else
3210 flist->xbf_first = free->xbfi_next;
3211 flist->xbf_count--;
3212 kmem_zone_free(xfs_bmap_free_item_zone, free);
3213 }
3214
3215 /*
3216 * Remove count entries from the extents array for inode "ip", starting
3217 * at index "idx". Copies the remaining items down over the deleted ones,
3218 * and gives back the excess memory.
3219 */
3220 STATIC void
3221 xfs_bmap_delete_exlist(
3222 xfs_inode_t *ip, /* incore inode pointer */
3223 xfs_extnum_t idx, /* starting delete index */
3224 xfs_extnum_t count, /* count of items to delete */
3225 int whichfork) /* data or attr fork */
3226 {
3227 xfs_bmbt_rec_t *base; /* base of extent list */
3228 xfs_ifork_t *ifp; /* inode fork pointer */
3229 xfs_extnum_t nextents; /* number of extents in list after */
3230
3231 ifp = XFS_IFORK_PTR(ip, whichfork);
3232 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
3233 base = ifp->if_u1.if_extents;
3234 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - count;
3235 memmove(&base[idx], &base[idx + count],
3236 (nextents - idx) * sizeof(*base));
3237 xfs_iext_realloc(ip, -count, whichfork);
3238 }
3239
3240 /*
3241 * Convert an extents-format file into a btree-format file.
3242 * The new file will have a root block (in the inode) and a single child block.
3243 */
3244 STATIC int /* error */
3245 xfs_bmap_extents_to_btree(
3246 xfs_trans_t *tp, /* transaction pointer */
3247 xfs_inode_t *ip, /* incore inode pointer */
3248 xfs_fsblock_t *firstblock, /* first-block-allocated */
3249 xfs_bmap_free_t *flist, /* blocks freed in xaction */
3250 xfs_btree_cur_t **curp, /* cursor returned to caller */
3251 int wasdel, /* converting a delayed alloc */
3252 int *logflagsp, /* inode logging flags */
3253 int whichfork) /* data or attr fork */
3254 {
3255 xfs_bmbt_block_t *ablock; /* allocated (child) bt block */
3256 xfs_buf_t *abp; /* buffer for ablock */
3257 xfs_alloc_arg_t args; /* allocation arguments */
3258 xfs_bmbt_rec_t *arp; /* child record pointer */
3259 xfs_bmbt_block_t *block; /* btree root block */
3260 xfs_btree_cur_t *cur; /* bmap btree cursor */
3261 xfs_bmbt_rec_t *ep; /* extent list pointer */
3262 int error; /* error return value */
3263 xfs_extnum_t i, cnt; /* extent list index */
3264 xfs_ifork_t *ifp; /* inode fork pointer */
3265 xfs_bmbt_key_t *kp; /* root block key pointer */
3266 xfs_mount_t *mp; /* mount structure */
3267 xfs_extnum_t nextents; /* extent list size */
3268 xfs_bmbt_ptr_t *pp; /* root block address pointer */
3269
3270 ifp = XFS_IFORK_PTR(ip, whichfork);
3271 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
3272 ASSERT(ifp->if_ext_max ==
3273 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
3274 /*
3275 * Make space in the inode incore.
3276 */
3277 xfs_iroot_realloc(ip, 1, whichfork);
3278 ifp->if_flags |= XFS_IFBROOT;
3279 /*
3280 * Fill in the root.
3281 */
3282 block = ifp->if_broot;
3283 block->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3284 block->bb_level = cpu_to_be16(1);
3285 block->bb_numrecs = cpu_to_be16(1);
3286 block->bb_leftsib = cpu_to_be64(NULLDFSBNO);
3287 block->bb_rightsib = cpu_to_be64(NULLDFSBNO);
3288 /*
3289 * Need a cursor. Can't allocate until bb_level is filled in.
3290 */
3291 mp = ip->i_mount;
3292 cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
3293 whichfork);
3294 cur->bc_private.b.firstblock = *firstblock;
3295 cur->bc_private.b.flist = flist;
3296 cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
3297 /*
3298 * Convert to a btree with two levels, one record in root.
3299 */
3300 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
3301 args.tp = tp;
3302 args.mp = mp;
3303 if (*firstblock == NULLFSBLOCK) {
3304 args.type = XFS_ALLOCTYPE_START_BNO;
3305 args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
3306 } else if (flist->xbf_low) {
3307 args.type = XFS_ALLOCTYPE_START_BNO;
3308 args.fsbno = *firstblock;
3309 } else {
3310 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3311 args.fsbno = *firstblock;
3312 }
3313 args.minlen = args.maxlen = args.prod = 1;
3314 args.total = args.minleft = args.alignment = args.mod = args.isfl =
3315 args.minalignslop = 0;
3316 args.wasdel = wasdel;
3317 *logflagsp = 0;
3318 if ((error = xfs_alloc_vextent(&args))) {
3319 xfs_iroot_realloc(ip, -1, whichfork);
3320 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
3321 return error;
3322 }
3323 /*
3324 * Allocation can't fail, the space was reserved.
3325 */
3326 ASSERT(args.fsbno != NULLFSBLOCK);
3327 ASSERT(*firstblock == NULLFSBLOCK ||
3328 args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) ||
3329 (flist->xbf_low &&
3330 args.agno > XFS_FSB_TO_AGNO(mp, *firstblock)));
3331 *firstblock = cur->bc_private.b.firstblock = args.fsbno;
3332 cur->bc_private.b.allocated++;
3333 ip->i_d.di_nblocks++;
3334 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
3335 abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
3336 /*
3337 * Fill in the child block.
3338 */
3339 ablock = XFS_BUF_TO_BMBT_BLOCK(abp);
3340 ablock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3341 ablock->bb_level = 0;
3342 ablock->bb_leftsib = cpu_to_be64(NULLDFSBNO);
3343 ablock->bb_rightsib = cpu_to_be64(NULLDFSBNO);
3344 arp = XFS_BMAP_REC_IADDR(ablock, 1, cur);
3345 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3346 for (ep = ifp->if_u1.if_extents, cnt = i = 0; i < nextents; i++, ep++) {
3347 if (!ISNULLSTARTBLOCK(xfs_bmbt_get_startblock(ep))) {
3348 arp->l0 = INT_GET(ep->l0, ARCH_CONVERT);
3349 arp->l1 = INT_GET(ep->l1, ARCH_CONVERT);
3350 arp++; cnt++;
3351 }
3352 }
3353 ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
3354 ablock->bb_numrecs = cpu_to_be16(cnt);
3355 /*
3356 * Fill in the root key and pointer.
3357 */
3358 kp = XFS_BMAP_KEY_IADDR(block, 1, cur);
3359 arp = XFS_BMAP_REC_IADDR(ablock, 1, cur);
3360 INT_SET(kp->br_startoff, ARCH_CONVERT, xfs_bmbt_disk_get_startoff(arp));
3361 pp = XFS_BMAP_PTR_IADDR(block, 1, cur);
3362 INT_SET(*pp, ARCH_CONVERT, args.fsbno);
3363 /*
3364 * Do all this logging at the end so that
3365 * the root is at the right level.
3366 */
3367 xfs_bmbt_log_block(cur, abp, XFS_BB_ALL_BITS);
3368 xfs_bmbt_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
3369 ASSERT(*curp == NULL);
3370 *curp = cur;
3371 *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FBROOT(whichfork);
3372 return 0;
3373 }
3374
3375 /*
3376 * Insert new item(s) in the extent list for inode "ip".
3377 * Count new items are inserted at offset idx.
3378 */
3379 STATIC void
3380 xfs_bmap_insert_exlist(
3381 xfs_inode_t *ip, /* incore inode pointer */
3382 xfs_extnum_t idx, /* starting index of new items */
3383 xfs_extnum_t count, /* number of inserted items */
3384 xfs_bmbt_irec_t *new, /* items to insert */
3385 int whichfork) /* data or attr fork */
3386 {
3387 xfs_bmbt_rec_t *base; /* extent list base */
3388 xfs_ifork_t *ifp; /* inode fork pointer */
3389 xfs_extnum_t nextents; /* extent list size */
3390 xfs_extnum_t to; /* extent list index */
3391
3392 ifp = XFS_IFORK_PTR(ip, whichfork);
3393 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
3394 xfs_iext_realloc(ip, count, whichfork);
3395 base = ifp->if_u1.if_extents;
3396 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3397 memmove(&base[idx + count], &base[idx],
3398 (nextents - (idx + count)) * sizeof(*base));
3399 for (to = idx; to < idx + count; to++, new++)
3400 xfs_bmbt_set_all(&base[to], new);
3401 }
3402
3403 /*
3404 * Helper routine to reset inode di_forkoff field when switching
3405 * attribute fork from local to extent format - we reset it where
3406 * possible to make space available for inline data fork extents.
3407 */
3408 STATIC void
3409 xfs_bmap_forkoff_reset(
3410 xfs_mount_t *mp,
3411 xfs_inode_t *ip,
3412 int whichfork)
3413 {
3414 if (whichfork == XFS_ATTR_FORK &&
3415 (ip->i_d.di_format != XFS_DINODE_FMT_DEV) &&
3416 (ip->i_d.di_format != XFS_DINODE_FMT_UUID) &&
3417 ((mp->m_attroffset >> 3) > ip->i_d.di_forkoff)) {
3418 ip->i_d.di_forkoff = mp->m_attroffset >> 3;
3419 ip->i_df.if_ext_max = XFS_IFORK_DSIZE(ip) /
3420 (uint)sizeof(xfs_bmbt_rec_t);
3421 ip->i_afp->if_ext_max = XFS_IFORK_ASIZE(ip) /
3422 (uint)sizeof(xfs_bmbt_rec_t);
3423 }
3424 }
3425
3426 /*
3427 * Convert a local file to an extents file.
3428 * This code is out of bounds for data forks of regular files,
3429 * since the file data needs to get logged so things will stay consistent.
3430 * (The bmap-level manipulations are ok, though).
3431 */
3432 STATIC int /* error */
3433 xfs_bmap_local_to_extents(
3434 xfs_trans_t *tp, /* transaction pointer */
3435 xfs_inode_t *ip, /* incore inode pointer */
3436 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
3437 xfs_extlen_t total, /* total blocks needed by transaction */
3438 int *logflagsp, /* inode logging flags */
3439 int whichfork) /* data or attr fork */
3440 {
3441 int error; /* error return value */
3442 int flags; /* logging flags returned */
3443 #ifdef XFS_BMAP_TRACE
3444 static char fname[] = "xfs_bmap_local_to_extents";
3445 #endif
3446 xfs_ifork_t *ifp; /* inode fork pointer */
3447
3448 /*
3449 * We don't want to deal with the case of keeping inode data inline yet.
3450 * So sending the data fork of a regular inode is invalid.
3451 */
3452 ASSERT(!((ip->i_d.di_mode & S_IFMT) == S_IFREG &&
3453 whichfork == XFS_DATA_FORK));
3454 ifp = XFS_IFORK_PTR(ip, whichfork);
3455 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
3456 flags = 0;
3457 error = 0;
3458 if (ifp->if_bytes) {
3459 xfs_alloc_arg_t args; /* allocation arguments */
3460 xfs_buf_t *bp; /* buffer for extent list block */
3461 xfs_bmbt_rec_t *ep; /* extent list pointer */
3462
3463 args.tp = tp;
3464 args.mp = ip->i_mount;
3465 ASSERT(ifp->if_flags & XFS_IFINLINE);
3466 /*
3467 * Allocate a block. We know we need only one, since the
3468 * file currently fits in an inode.
3469 */
3470 if (*firstblock == NULLFSBLOCK) {
3471 args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
3472 args.type = XFS_ALLOCTYPE_START_BNO;
3473 } else {
3474 args.fsbno = *firstblock;
3475 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3476 }
3477 args.total = total;
3478 args.mod = args.minleft = args.alignment = args.wasdel =
3479 args.isfl = args.minalignslop = 0;
3480 args.minlen = args.maxlen = args.prod = 1;
3481 if ((error = xfs_alloc_vextent(&args)))
3482 goto done;
3483 /*
3484 * Can't fail, the space was reserved.
3485 */
3486 ASSERT(args.fsbno != NULLFSBLOCK);
3487 ASSERT(args.len == 1);
3488 *firstblock = args.fsbno;
3489 bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
3490 memcpy((char *)XFS_BUF_PTR(bp), ifp->if_u1.if_data,
3491 ifp->if_bytes);
3492 xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
3493 xfs_bmap_forkoff_reset(args.mp, ip, whichfork);
3494 xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
3495 xfs_iext_realloc(ip, 1, whichfork);
3496 ep = ifp->if_u1.if_extents;
3497 xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
3498 xfs_bmap_trace_post_update(fname, "new", ip, 0, whichfork);
3499 XFS_IFORK_NEXT_SET(ip, whichfork, 1);
3500 ip->i_d.di_nblocks = 1;
3501 XFS_TRANS_MOD_DQUOT_BYINO(args.mp, tp, ip,
3502 XFS_TRANS_DQ_BCOUNT, 1L);
3503 flags |= XFS_ILOG_FEXT(whichfork);
3504 } else {
3505 ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
3506 xfs_bmap_forkoff_reset(ip->i_mount, ip, whichfork);
3507 }
3508 ifp->if_flags &= ~XFS_IFINLINE;
3509 ifp->if_flags |= XFS_IFEXTENTS;
3510 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
3511 flags |= XFS_ILOG_CORE;
3512 done:
3513 *logflagsp = flags;
3514 return error;
3515 }
3516
3517 xfs_bmbt_rec_t * /* pointer to found extent entry */
3518 xfs_bmap_do_search_extents(
3519 xfs_bmbt_rec_t *base, /* base of extent list */
3520 xfs_extnum_t lastx, /* last extent index used */
3521 xfs_extnum_t nextents, /* extent list size */
3522 xfs_fileoff_t bno, /* block number searched for */
3523 int *eofp, /* out: end of file found */
3524 xfs_extnum_t *lastxp, /* out: last extent index */
3525 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3526 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3527 {
3528 xfs_bmbt_rec_t *ep; /* extent list entry pointer */
3529 xfs_bmbt_irec_t got; /* extent list entry, decoded */
3530 int high; /* high index of binary search */
3531 int low; /* low index of binary search */
3532
3533 /*
3534 * Initialize the extent entry structure to catch access to
3535 * uninitialized br_startblock field.
3536 */
3537 got.br_startoff = 0xffa5a5a5a5a5a5a5LL;
3538 got.br_blockcount = 0xa55a5a5a5a5a5a5aLL;
3539 got.br_state = XFS_EXT_INVALID;
3540
3541 #if XFS_BIG_BLKNOS
3542 got.br_startblock = 0xffffa5a5a5a5a5a5LL;
3543 #else
3544 got.br_startblock = 0xffffa5a5;
3545 #endif
3546
3547 if (lastx != NULLEXTNUM && lastx < nextents)
3548 ep = base + lastx;
3549 else
3550 ep = NULL;
3551 prevp->br_startoff = NULLFILEOFF;
3552 if (ep && bno >= (got.br_startoff = xfs_bmbt_get_startoff(ep)) &&
3553 bno < got.br_startoff +
3554 (got.br_blockcount = xfs_bmbt_get_blockcount(ep)))
3555 *eofp = 0;
3556 else if (ep && lastx < nextents - 1 &&
3557 bno >= (got.br_startoff = xfs_bmbt_get_startoff(ep + 1)) &&
3558 bno < got.br_startoff +
3559 (got.br_blockcount = xfs_bmbt_get_blockcount(ep + 1))) {
3560 lastx++;
3561 ep++;
3562 *eofp = 0;
3563 } else if (nextents == 0)
3564 *eofp = 1;
3565 else if (bno == 0 &&
3566 (got.br_startoff = xfs_bmbt_get_startoff(base)) == 0) {
3567 ep = base;
3568 lastx = 0;
3569 got.br_blockcount = xfs_bmbt_get_blockcount(ep);
3570 *eofp = 0;
3571 } else {
3572 /* binary search the extents array */
3573 low = 0;
3574 high = nextents - 1;
3575 while (low <= high) {
3576 XFS_STATS_INC(xs_cmp_exlist);
3577 lastx = (low + high) >> 1;
3578 ep = base + lastx;
3579 got.br_startoff = xfs_bmbt_get_startoff(ep);
3580 got.br_blockcount = xfs_bmbt_get_blockcount(ep);
3581 if (bno < got.br_startoff)
3582 high = lastx - 1;
3583 else if (bno >= got.br_startoff + got.br_blockcount)
3584 low = lastx + 1;
3585 else {
3586 got.br_startblock = xfs_bmbt_get_startblock(ep);
3587 got.br_state = xfs_bmbt_get_state(ep);
3588 *eofp = 0;
3589 *lastxp = lastx;
3590 *gotp = got;
3591 return ep;
3592 }
3593 }
3594 if (bno >= got.br_startoff + got.br_blockcount) {
3595 lastx++;
3596 if (lastx == nextents) {
3597 *eofp = 1;
3598 got.br_startblock = xfs_bmbt_get_startblock(ep);
3599 got.br_state = xfs_bmbt_get_state(ep);
3600 *prevp = got;
3601 ep = NULL;
3602 } else {
3603 *eofp = 0;
3604 xfs_bmbt_get_all(ep, prevp);
3605 ep++;
3606 got.br_startoff = xfs_bmbt_get_startoff(ep);
3607 got.br_blockcount = xfs_bmbt_get_blockcount(ep);
3608 }
3609 } else {
3610 *eofp = 0;
3611 if (ep > base)
3612 xfs_bmbt_get_all(ep - 1, prevp);
3613 }
3614 }
3615 if (ep) {
3616 got.br_startblock = xfs_bmbt_get_startblock(ep);
3617 got.br_state = xfs_bmbt_get_state(ep);
3618 }
3619 *lastxp = lastx;
3620 *gotp = got;
3621 return ep;
3622 }
3623
3624 /*
3625 * Search the extents list for the inode, for the extent containing bno.
3626 * If bno lies in a hole, point to the next entry. If bno lies past eof,
3627 * *eofp will be set, and *prevp will contain the last entry (null if none).
3628 * Else, *lastxp will be set to the index of the found
3629 * entry; *gotp will contain the entry.
3630 */
3631 STATIC xfs_bmbt_rec_t * /* pointer to found extent entry */
3632 xfs_bmap_search_extents(
3633 xfs_inode_t *ip, /* incore inode pointer */
3634 xfs_fileoff_t bno, /* block number searched for */
3635 int whichfork, /* data or attr fork */
3636 int *eofp, /* out: end of file found */
3637 xfs_extnum_t *lastxp, /* out: last extent index */
3638 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3639 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3640 {
3641 xfs_ifork_t *ifp; /* inode fork pointer */
3642 xfs_bmbt_rec_t *base; /* base of extent list */
3643 xfs_extnum_t lastx; /* last extent index used */
3644 xfs_extnum_t nextents; /* extent list size */
3645 xfs_bmbt_rec_t *ep; /* extent list entry pointer */
3646 int rt; /* realtime flag */
3647
3648 XFS_STATS_INC(xs_look_exlist);
3649 ifp = XFS_IFORK_PTR(ip, whichfork);
3650 lastx = ifp->if_lastex;
3651 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3652 base = &ifp->if_u1.if_extents[0];
3653
3654 ep = xfs_bmap_do_search_extents(base, lastx, nextents, bno, eofp,
3655 lastxp, gotp, prevp);
3656 rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
3657 if (unlikely(!rt && !gotp->br_startblock && (*lastxp != NULLEXTNUM))) {
3658 cmn_err(CE_PANIC,"Access to block zero: fs: <%s> inode: %lld "
3659 "start_block : %llx start_off : %llx blkcnt : %llx "
3660 "extent-state : %x \n",
3661 (ip->i_mount)->m_fsname, (long long)ip->i_ino,
3662 (unsigned long long)gotp->br_startblock,
3663 (unsigned long long)gotp->br_startoff,
3664 (unsigned long long)gotp->br_blockcount,
3665 gotp->br_state);
3666 }
3667 return ep;
3668 }
3669
3670
3671 #ifdef XFS_BMAP_TRACE
3672 ktrace_t *xfs_bmap_trace_buf;
3673
3674 /*
3675 * Add a bmap trace buffer entry. Base routine for the others.
3676 */
3677 STATIC void
3678 xfs_bmap_trace_addentry(
3679 int opcode, /* operation */
3680 char *fname, /* function name */
3681 char *desc, /* operation description */
3682 xfs_inode_t *ip, /* incore inode pointer */
3683 xfs_extnum_t idx, /* index of entry(ies) */
3684 xfs_extnum_t cnt, /* count of entries, 1 or 2 */
3685 xfs_bmbt_rec_t *r1, /* first record */
3686 xfs_bmbt_rec_t *r2, /* second record or null */
3687 int whichfork) /* data or attr fork */
3688 {
3689 xfs_bmbt_rec_t tr2;
3690
3691 ASSERT(cnt == 1 || cnt == 2);
3692 ASSERT(r1 != NULL);
3693 if (cnt == 1) {
3694 ASSERT(r2 == NULL);
3695 r2 = &tr2;
3696 memset(&tr2, 0, sizeof(tr2));
3697 } else
3698 ASSERT(r2 != NULL);
3699 ktrace_enter(xfs_bmap_trace_buf,
3700 (void *)(__psint_t)(opcode | (whichfork << 16)),
3701 (void *)fname, (void *)desc, (void *)ip,
3702 (void *)(__psint_t)idx,
3703 (void *)(__psint_t)cnt,
3704 (void *)(__psunsigned_t)(ip->i_ino >> 32),
3705 (void *)(__psunsigned_t)(unsigned)ip->i_ino,
3706 (void *)(__psunsigned_t)(r1->l0 >> 32),
3707 (void *)(__psunsigned_t)(unsigned)(r1->l0),
3708 (void *)(__psunsigned_t)(r1->l1 >> 32),
3709 (void *)(__psunsigned_t)(unsigned)(r1->l1),
3710 (void *)(__psunsigned_t)(r2->l0 >> 32),
3711 (void *)(__psunsigned_t)(unsigned)(r2->l0),
3712 (void *)(__psunsigned_t)(r2->l1 >> 32),
3713 (void *)(__psunsigned_t)(unsigned)(r2->l1)
3714 );
3715 ASSERT(ip->i_xtrace);
3716 ktrace_enter(ip->i_xtrace,
3717 (void *)(__psint_t)(opcode | (whichfork << 16)),
3718 (void *)fname, (void *)desc, (void *)ip,
3719 (void *)(__psint_t)idx,
3720 (void *)(__psint_t)cnt,
3721 (void *)(__psunsigned_t)(ip->i_ino >> 32),
3722 (void *)(__psunsigned_t)(unsigned)ip->i_ino,
3723 (void *)(__psunsigned_t)(r1->l0 >> 32),
3724 (void *)(__psunsigned_t)(unsigned)(r1->l0),
3725 (void *)(__psunsigned_t)(r1->l1 >> 32),
3726 (void *)(__psunsigned_t)(unsigned)(r1->l1),
3727 (void *)(__psunsigned_t)(r2->l0 >> 32),
3728 (void *)(__psunsigned_t)(unsigned)(r2->l0),
3729 (void *)(__psunsigned_t)(r2->l1 >> 32),
3730 (void *)(__psunsigned_t)(unsigned)(r2->l1)
3731 );
3732 }
3733
3734 /*
3735 * Add bmap trace entry prior to a call to xfs_bmap_delete_exlist.
3736 */
3737 STATIC void
3738 xfs_bmap_trace_delete(
3739 char *fname, /* function name */
3740 char *desc, /* operation description */
3741 xfs_inode_t *ip, /* incore inode pointer */
3742 xfs_extnum_t idx, /* index of entry(entries) deleted */
3743 xfs_extnum_t cnt, /* count of entries deleted, 1 or 2 */
3744 int whichfork) /* data or attr fork */
3745 {
3746 xfs_ifork_t *ifp; /* inode fork pointer */
3747
3748 ifp = XFS_IFORK_PTR(ip, whichfork);
3749 xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_DELETE, fname, desc, ip, idx,
3750 cnt, &ifp->if_u1.if_extents[idx],
3751 cnt == 2 ? &ifp->if_u1.if_extents[idx + 1] : NULL,
3752 whichfork);
3753 }
3754
3755 /*
3756 * Add bmap trace entry prior to a call to xfs_bmap_insert_exlist, or
3757 * reading in the extents list from the disk (in the btree).
3758 */
3759 STATIC void
3760 xfs_bmap_trace_insert(
3761 char *fname, /* function name */
3762 char *desc, /* operation description */
3763 xfs_inode_t *ip, /* incore inode pointer */
3764 xfs_extnum_t idx, /* index of entry(entries) inserted */
3765 xfs_extnum_t cnt, /* count of entries inserted, 1 or 2 */
3766 xfs_bmbt_irec_t *r1, /* inserted record 1 */
3767 xfs_bmbt_irec_t *r2, /* inserted record 2 or null */
3768 int whichfork) /* data or attr fork */
3769 {
3770 xfs_bmbt_rec_t tr1; /* compressed record 1 */
3771 xfs_bmbt_rec_t tr2; /* compressed record 2 if needed */
3772
3773 xfs_bmbt_set_all(&tr1, r1);
3774 if (cnt == 2) {
3775 ASSERT(r2 != NULL);
3776 xfs_bmbt_set_all(&tr2, r2);
3777 } else {
3778 ASSERT(cnt == 1);
3779 ASSERT(r2 == NULL);
3780 }
3781 xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_INSERT, fname, desc, ip, idx,
3782 cnt, &tr1, cnt == 2 ? &tr2 : NULL, whichfork);
3783 }
3784
3785 /*
3786 * Add bmap trace entry after updating an extent list entry in place.
3787 */
3788 STATIC void
3789 xfs_bmap_trace_post_update(
3790 char *fname, /* function name */
3791 char *desc, /* operation description */
3792 xfs_inode_t *ip, /* incore inode pointer */
3793 xfs_extnum_t idx, /* index of entry updated */
3794 int whichfork) /* data or attr fork */
3795 {
3796 xfs_ifork_t *ifp; /* inode fork pointer */
3797
3798 ifp = XFS_IFORK_PTR(ip, whichfork);
3799 xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_POST_UP, fname, desc, ip, idx,
3800 1, &ifp->if_u1.if_extents[idx], NULL, whichfork);
3801 }
3802
3803 /*
3804 * Add bmap trace entry prior to updating an extent list entry in place.
3805 */
3806 STATIC void
3807 xfs_bmap_trace_pre_update(
3808 char *fname, /* function name */
3809 char *desc, /* operation description */
3810 xfs_inode_t *ip, /* incore inode pointer */
3811 xfs_extnum_t idx, /* index of entry to be updated */
3812 int whichfork) /* data or attr fork */
3813 {
3814 xfs_ifork_t *ifp; /* inode fork pointer */
3815
3816 ifp = XFS_IFORK_PTR(ip, whichfork);
3817 xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_PRE_UP, fname, desc, ip, idx, 1,
3818 &ifp->if_u1.if_extents[idx], NULL, whichfork);
3819 }
3820 #endif /* XFS_BMAP_TRACE */
3821
3822 /*
3823 * Compute the worst-case number of indirect blocks that will be used
3824 * for ip's delayed extent of length "len".
3825 */
3826 STATIC xfs_filblks_t
3827 xfs_bmap_worst_indlen(
3828 xfs_inode_t *ip, /* incore inode pointer */
3829 xfs_filblks_t len) /* delayed extent length */
3830 {
3831 int level; /* btree level number */
3832 int maxrecs; /* maximum record count at this level */
3833 xfs_mount_t *mp; /* mount structure */
3834 xfs_filblks_t rval; /* return value */
3835
3836 mp = ip->i_mount;
3837 maxrecs = mp->m_bmap_dmxr[0];
3838 for (level = 0, rval = 0;
3839 level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
3840 level++) {
3841 len += maxrecs - 1;
3842 do_div(len, maxrecs);
3843 rval += len;
3844 if (len == 1)
3845 return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
3846 level - 1;
3847 if (level == 0)
3848 maxrecs = mp->m_bmap_dmxr[1];
3849 }
3850 return rval;
3851 }
3852
3853 #if defined(XFS_RW_TRACE)
3854 STATIC void
3855 xfs_bunmap_trace(
3856 xfs_inode_t *ip,
3857 xfs_fileoff_t bno,
3858 xfs_filblks_t len,
3859 int flags,
3860 inst_t *ra)
3861 {
3862 if (ip->i_rwtrace == NULL)
3863 return;
3864 ktrace_enter(ip->i_rwtrace,
3865 (void *)(__psint_t)XFS_BUNMAPI,
3866 (void *)ip,
3867 (void *)(__psint_t)((ip->i_d.di_size >> 32) & 0xffffffff),
3868 (void *)(__psint_t)(ip->i_d.di_size & 0xffffffff),
3869 (void *)(__psint_t)(((xfs_dfiloff_t)bno >> 32) & 0xffffffff),
3870 (void *)(__psint_t)((xfs_dfiloff_t)bno & 0xffffffff),
3871 (void *)(__psint_t)len,
3872 (void *)(__psint_t)flags,
3873 (void *)(unsigned long)current_cpu(),
3874 (void *)ra,
3875 (void *)0,
3876 (void *)0,
3877 (void *)0,
3878 (void *)0,
3879 (void *)0,
3880 (void *)0);
3881 }
3882 #endif
3883
3884 /*
3885 * Convert inode from non-attributed to attributed.
3886 * Must not be in a transaction, ip must not be locked.
3887 */
3888 int /* error code */
3889 xfs_bmap_add_attrfork(
3890 xfs_inode_t *ip, /* incore inode pointer */
3891 int size, /* space new attribute needs */
3892 int rsvd) /* xact may use reserved blks */
3893 {
3894 xfs_fsblock_t firstblock; /* 1st block/ag allocated */
3895 xfs_bmap_free_t flist; /* freed extent list */
3896 xfs_mount_t *mp; /* mount structure */
3897 xfs_trans_t *tp; /* transaction pointer */
3898 unsigned long s; /* spinlock spl value */
3899 int blks; /* space reservation */
3900 int version = 1; /* superblock attr version */
3901 int committed; /* xaction was committed */
3902 int logflags; /* logging flags */
3903 int error; /* error return value */
3904
3905 ASSERT(XFS_IFORK_Q(ip) == 0);
3906 ASSERT(ip->i_df.if_ext_max ==
3907 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3908
3909 mp = ip->i_mount;
3910 ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
3911 tp = xfs_trans_alloc(mp, XFS_TRANS_ADDAFORK);
3912 blks = XFS_ADDAFORK_SPACE_RES(mp);
3913 if (rsvd)
3914 tp->t_flags |= XFS_TRANS_RESERVE;
3915 if ((error = xfs_trans_reserve(tp, blks, XFS_ADDAFORK_LOG_RES(mp), 0,
3916 XFS_TRANS_PERM_LOG_RES, XFS_ADDAFORK_LOG_COUNT)))
3917 goto error0;
3918 xfs_ilock(ip, XFS_ILOCK_EXCL);
3919 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, blks, 0, rsvd ?
3920 XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
3921 XFS_QMOPT_RES_REGBLKS);
3922 if (error) {
3923 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3924 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
3925 return error;
3926 }
3927 if (XFS_IFORK_Q(ip))
3928 goto error1;
3929 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
3930 /*
3931 * For inodes coming from pre-6.2 filesystems.
3932 */
3933 ASSERT(ip->i_d.di_aformat == 0);
3934 ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
3935 }
3936 ASSERT(ip->i_d.di_anextents == 0);
3937 VN_HOLD(XFS_ITOV(ip));
3938 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
3939 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
3940 switch (ip->i_d.di_format) {
3941 case XFS_DINODE_FMT_DEV:
3942 ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
3943 break;
3944 case XFS_DINODE_FMT_UUID:
3945 ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
3946 break;
3947 case XFS_DINODE_FMT_LOCAL:
3948 case XFS_DINODE_FMT_EXTENTS:
3949 case XFS_DINODE_FMT_BTREE:
3950 ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
3951 if (!ip->i_d.di_forkoff)
3952 ip->i_d.di_forkoff = mp->m_attroffset >> 3;
3953 else if (mp->m_flags & XFS_MOUNT_ATTR2)
3954 version = 2;
3955 break;
3956 default:
3957 ASSERT(0);
3958 error = XFS_ERROR(EINVAL);
3959 goto error1;
3960 }
3961 ip->i_df.if_ext_max =
3962 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
3963 ASSERT(ip->i_afp == NULL);
3964 ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
3965 ip->i_afp->if_ext_max =
3966 XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
3967 ip->i_afp->if_flags = XFS_IFEXTENTS;
3968 logflags = 0;
3969 XFS_BMAP_INIT(&flist, &firstblock);
3970 switch (ip->i_d.di_format) {
3971 case XFS_DINODE_FMT_LOCAL:
3972 error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &flist,
3973 &logflags);
3974 break;
3975 case XFS_DINODE_FMT_EXTENTS:
3976 error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
3977 &flist, &logflags);
3978 break;
3979 case XFS_DINODE_FMT_BTREE:
3980 error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &flist,
3981 &logflags);
3982 break;
3983 default:
3984 error = 0;
3985 break;
3986 }
3987 if (logflags)
3988 xfs_trans_log_inode(tp, ip, logflags);
3989 if (error)
3990 goto error2;
3991 if (!XFS_SB_VERSION_HASATTR(&mp->m_sb) ||
3992 (!XFS_SB_VERSION_HASATTR2(&mp->m_sb) && version == 2)) {
3993 __int64_t sbfields = 0;
3994
3995 s = XFS_SB_LOCK(mp);
3996 if (!XFS_SB_VERSION_HASATTR(&mp->m_sb)) {
3997 XFS_SB_VERSION_ADDATTR(&mp->m_sb);
3998 sbfields |= XFS_SB_VERSIONNUM;
3999 }
4000 if (!XFS_SB_VERSION_HASATTR2(&mp->m_sb) && version == 2) {
4001 XFS_SB_VERSION_ADDATTR2(&mp->m_sb);
4002 sbfields |= (XFS_SB_VERSIONNUM | XFS_SB_FEATURES2);
4003 }
4004 if (sbfields) {
4005 XFS_SB_UNLOCK(mp, s);
4006 xfs_mod_sb(tp, sbfields);
4007 } else
4008 XFS_SB_UNLOCK(mp, s);
4009 }
4010 if ((error = xfs_bmap_finish(&tp, &flist, firstblock, &committed)))
4011 goto error2;
4012 error = xfs_trans_commit(tp, XFS_TRANS_PERM_LOG_RES, NULL);
4013 ASSERT(ip->i_df.if_ext_max ==
4014 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
4015 return error;
4016 error2:
4017 xfs_bmap_cancel(&flist);
4018 error1:
4019 ASSERT(ismrlocked(&ip->i_lock,MR_UPDATE));
4020 xfs_iunlock(ip, XFS_ILOCK_EXCL);
4021 error0:
4022 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
4023 ASSERT(ip->i_df.if_ext_max ==
4024 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
4025 return error;
4026 }
4027
4028 /*
4029 * Add the extent to the list of extents to be free at transaction end.
4030 * The list is maintained sorted (by block number).
4031 */
4032 /* ARGSUSED */
4033 void
4034 xfs_bmap_add_free(
4035 xfs_fsblock_t bno, /* fs block number of extent */
4036 xfs_filblks_t len, /* length of extent */
4037 xfs_bmap_free_t *flist, /* list of extents */
4038 xfs_mount_t *mp) /* mount point structure */
4039 {
4040 xfs_bmap_free_item_t *cur; /* current (next) element */
4041 xfs_bmap_free_item_t *new; /* new element */
4042 xfs_bmap_free_item_t *prev; /* previous element */
4043 #ifdef DEBUG
4044 xfs_agnumber_t agno;
4045 xfs_agblock_t agbno;
4046
4047 ASSERT(bno != NULLFSBLOCK);
4048 ASSERT(len > 0);
4049 ASSERT(len <= MAXEXTLEN);
4050 ASSERT(!ISNULLSTARTBLOCK(bno));
4051 agno = XFS_FSB_TO_AGNO(mp, bno);
4052 agbno = XFS_FSB_TO_AGBNO(mp, bno);
4053 ASSERT(agno < mp->m_sb.sb_agcount);
4054 ASSERT(agbno < mp->m_sb.sb_agblocks);
4055 ASSERT(len < mp->m_sb.sb_agblocks);
4056 ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
4057 #endif
4058 ASSERT(xfs_bmap_free_item_zone != NULL);
4059 new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
4060 new->xbfi_startblock = bno;
4061 new->xbfi_blockcount = (xfs_extlen_t)len;
4062 for (prev = NULL, cur = flist->xbf_first;
4063 cur != NULL;
4064 prev = cur, cur = cur->xbfi_next) {
4065 if (cur->xbfi_startblock >= bno)
4066 break;
4067 }
4068 if (prev)
4069 prev->xbfi_next = new;
4070 else
4071 flist->xbf_first = new;
4072 new->xbfi_next = cur;
4073 flist->xbf_count++;
4074 }
4075
4076 /*
4077 * Compute and fill in the value of the maximum depth of a bmap btree
4078 * in this filesystem. Done once, during mount.
4079 */
4080 void
4081 xfs_bmap_compute_maxlevels(
4082 xfs_mount_t *mp, /* file system mount structure */
4083 int whichfork) /* data or attr fork */
4084 {
4085 int level; /* btree level */
4086 uint maxblocks; /* max blocks at this level */
4087 uint maxleafents; /* max leaf entries possible */
4088 int maxrootrecs; /* max records in root block */
4089 int minleafrecs; /* min records in leaf block */
4090 int minnoderecs; /* min records in node block */
4091 int sz; /* root block size */
4092
4093 /*
4094 * The maximum number of extents in a file, hence the maximum
4095 * number of leaf entries, is controlled by the type of di_nextents
4096 * (a signed 32-bit number, xfs_extnum_t), or by di_anextents
4097 * (a signed 16-bit number, xfs_aextnum_t).
4098 */
4099 if (whichfork == XFS_DATA_FORK) {
4100 maxleafents = MAXEXTNUM;
4101 sz = (mp->m_flags & XFS_MOUNT_ATTR2) ?
4102 XFS_BMDR_SPACE_CALC(MINDBTPTRS) : mp->m_attroffset;
4103 } else {
4104 maxleafents = MAXAEXTNUM;
4105 sz = (mp->m_flags & XFS_MOUNT_ATTR2) ?
4106 XFS_BMDR_SPACE_CALC(MINABTPTRS) :
4107 mp->m_sb.sb_inodesize - mp->m_attroffset;
4108 }
4109 maxrootrecs = (int)XFS_BTREE_BLOCK_MAXRECS(sz, xfs_bmdr, 0);
4110 minleafrecs = mp->m_bmap_dmnr[0];
4111 minnoderecs = mp->m_bmap_dmnr[1];
4112 maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
4113 for (level = 1; maxblocks > 1; level++) {
4114 if (maxblocks <= maxrootrecs)
4115 maxblocks = 1;
4116 else
4117 maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
4118 }
4119 mp->m_bm_maxlevels[whichfork] = level;
4120 }
4121
4122 /*
4123 * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
4124 * caller. Frees all the extents that need freeing, which must be done
4125 * last due to locking considerations. We never free any extents in
4126 * the first transaction. This is to allow the caller to make the first
4127 * transaction a synchronous one so that the pointers to the data being
4128 * broken in this transaction will be permanent before the data is actually
4129 * freed. This is necessary to prevent blocks from being reallocated
4130 * and written to before the free and reallocation are actually permanent.
4131 * We do not just make the first transaction synchronous here, because
4132 * there are more efficient ways to gain the same protection in some cases
4133 * (see the file truncation code).
4134 *
4135 * Return 1 if the given transaction was committed and a new one
4136 * started, and 0 otherwise in the committed parameter.
4137 */
4138 /*ARGSUSED*/
4139 int /* error */
4140 xfs_bmap_finish(
4141 xfs_trans_t **tp, /* transaction pointer addr */
4142 xfs_bmap_free_t *flist, /* i/o: list extents to free */
4143 xfs_fsblock_t firstblock, /* controlled ag for allocs */
4144 int *committed) /* xact committed or not */
4145 {
4146 xfs_efd_log_item_t *efd; /* extent free data */
4147 xfs_efi_log_item_t *efi; /* extent free intention */
4148 int error; /* error return value */
4149 xfs_bmap_free_item_t *free; /* free extent list item */
4150 unsigned int logres; /* new log reservation */
4151 unsigned int logcount; /* new log count */
4152 xfs_mount_t *mp; /* filesystem mount structure */
4153 xfs_bmap_free_item_t *next; /* next item on free list */
4154 xfs_trans_t *ntp; /* new transaction pointer */
4155
4156 ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
4157 if (flist->xbf_count == 0) {
4158 *committed = 0;
4159 return 0;
4160 }
4161 ntp = *tp;
4162 efi = xfs_trans_get_efi(ntp, flist->xbf_count);
4163 for (free = flist->xbf_first; free; free = free->xbfi_next)
4164 xfs_trans_log_efi_extent(ntp, efi, free->xbfi_startblock,
4165 free->xbfi_blockcount);
4166 logres = ntp->t_log_res;
4167 logcount = ntp->t_log_count;
4168 ntp = xfs_trans_dup(*tp);
4169 error = xfs_trans_commit(*tp, 0, NULL);
4170 *tp = ntp;
4171 *committed = 1;
4172 /*
4173 * We have a new transaction, so we should return committed=1,
4174 * even though we're returning an error.
4175 */
4176 if (error) {
4177 return error;
4178 }
4179 if ((error = xfs_trans_reserve(ntp, 0, logres, 0, XFS_TRANS_PERM_LOG_RES,
4180 logcount)))
4181 return error;
4182 efd = xfs_trans_get_efd(ntp, efi, flist->xbf_count);
4183 for (free = flist->xbf_first; free != NULL; free = next) {
4184 next = free->xbfi_next;
4185 if ((error = xfs_free_extent(ntp, free->xbfi_startblock,
4186 free->xbfi_blockcount))) {
4187 /*
4188 * The bmap free list will be cleaned up at a
4189 * higher level. The EFI will be canceled when
4190 * this transaction is aborted.
4191 * Need to force shutdown here to make sure it
4192 * happens, since this transaction may not be
4193 * dirty yet.
4194 */
4195 mp = ntp->t_mountp;
4196 if (!XFS_FORCED_SHUTDOWN(mp))
4197 xfs_force_shutdown(mp,
4198 (error == EFSCORRUPTED) ?
4199 XFS_CORRUPT_INCORE :
4200 XFS_METADATA_IO_ERROR);
4201 return error;
4202 }
4203 xfs_trans_log_efd_extent(ntp, efd, free->xbfi_startblock,
4204 free->xbfi_blockcount);
4205 xfs_bmap_del_free(flist, NULL, free);
4206 }
4207 return 0;
4208 }
4209
4210 /*
4211 * Free up any items left in the list.
4212 */
4213 void
4214 xfs_bmap_cancel(
4215 xfs_bmap_free_t *flist) /* list of bmap_free_items */
4216 {
4217 xfs_bmap_free_item_t *free; /* free list item */
4218 xfs_bmap_free_item_t *next;
4219
4220 if (flist->xbf_count == 0)
4221 return;
4222 ASSERT(flist->xbf_first != NULL);
4223 for (free = flist->xbf_first; free; free = next) {
4224 next = free->xbfi_next;
4225 xfs_bmap_del_free(flist, NULL, free);
4226 }
4227 ASSERT(flist->xbf_count == 0);
4228 }
4229
4230 /*
4231 * Returns the file-relative block number of the first unused block(s)
4232 * in the file with at least "len" logically contiguous blocks free.
4233 * This is the lowest-address hole if the file has holes, else the first block
4234 * past the end of file.
4235 * Return 0 if the file is currently local (in-inode).
4236 */
4237 int /* error */
4238 xfs_bmap_first_unused(
4239 xfs_trans_t *tp, /* transaction pointer */
4240 xfs_inode_t *ip, /* incore inode */
4241 xfs_extlen_t len, /* size of hole to find */
4242 xfs_fileoff_t *first_unused, /* unused block */
4243 int whichfork) /* data or attr fork */
4244 {
4245 xfs_bmbt_rec_t *base; /* base of extent array */
4246 xfs_bmbt_rec_t *ep; /* pointer to an extent entry */
4247 int error; /* error return value */
4248 xfs_ifork_t *ifp; /* inode fork pointer */
4249 xfs_fileoff_t lastaddr; /* last block number seen */
4250 xfs_fileoff_t lowest; /* lowest useful block */
4251 xfs_fileoff_t max; /* starting useful block */
4252 xfs_fileoff_t off; /* offset for this block */
4253 xfs_extnum_t nextents; /* number of extent entries */
4254
4255 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
4256 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
4257 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
4258 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4259 *first_unused = 0;
4260 return 0;
4261 }
4262 ifp = XFS_IFORK_PTR(ip, whichfork);
4263 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4264 (error = xfs_iread_extents(tp, ip, whichfork)))
4265 return error;
4266 lowest = *first_unused;
4267 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4268 base = &ifp->if_u1.if_extents[0];
4269 for (lastaddr = 0, max = lowest, ep = base;
4270 ep < &base[nextents];
4271 ep++) {
4272 off = xfs_bmbt_get_startoff(ep);
4273 /*
4274 * See if the hole before this extent will work.
4275 */
4276 if (off >= lowest + len && off - max >= len) {
4277 *first_unused = max;
4278 return 0;
4279 }
4280 lastaddr = off + xfs_bmbt_get_blockcount(ep);
4281 max = XFS_FILEOFF_MAX(lastaddr, lowest);
4282 }
4283 *first_unused = max;
4284 return 0;
4285 }
4286
4287 /*
4288 * Returns the file-relative block number of the last block + 1 before
4289 * last_block (input value) in the file.
4290 * This is not based on i_size, it is based on the extent list.
4291 * Returns 0 for local files, as they do not have an extent list.
4292 */
4293 int /* error */
4294 xfs_bmap_last_before(
4295 xfs_trans_t *tp, /* transaction pointer */
4296 xfs_inode_t *ip, /* incore inode */
4297 xfs_fileoff_t *last_block, /* last block */
4298 int whichfork) /* data or attr fork */
4299 {
4300 xfs_fileoff_t bno; /* input file offset */
4301 int eof; /* hit end of file */
4302 xfs_bmbt_rec_t *ep; /* pointer to last extent */
4303 int error; /* error return value */
4304 xfs_bmbt_irec_t got; /* current extent value */
4305 xfs_ifork_t *ifp; /* inode fork pointer */
4306 xfs_extnum_t lastx; /* last extent used */
4307 xfs_bmbt_irec_t prev; /* previous extent value */
4308
4309 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4310 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4311 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
4312 return XFS_ERROR(EIO);
4313 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4314 *last_block = 0;
4315 return 0;
4316 }
4317 ifp = XFS_IFORK_PTR(ip, whichfork);
4318 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4319 (error = xfs_iread_extents(tp, ip, whichfork)))
4320 return error;
4321 bno = *last_block - 1;
4322 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
4323 &prev);
4324 if (eof || xfs_bmbt_get_startoff(ep) > bno) {
4325 if (prev.br_startoff == NULLFILEOFF)
4326 *last_block = 0;
4327 else
4328 *last_block = prev.br_startoff + prev.br_blockcount;
4329 }
4330 /*
4331 * Otherwise *last_block is already the right answer.
4332 */
4333 return 0;
4334 }
4335
4336 /*
4337 * Returns the file-relative block number of the first block past eof in
4338 * the file. This is not based on i_size, it is based on the extent list.
4339 * Returns 0 for local files, as they do not have an extent list.
4340 */
4341 int /* error */
4342 xfs_bmap_last_offset(
4343 xfs_trans_t *tp, /* transaction pointer */
4344 xfs_inode_t *ip, /* incore inode */
4345 xfs_fileoff_t *last_block, /* last block */
4346 int whichfork) /* data or attr fork */
4347 {
4348 xfs_bmbt_rec_t *base; /* base of extent array */
4349 xfs_bmbt_rec_t *ep; /* pointer to last extent */
4350 int error; /* error return value */
4351 xfs_ifork_t *ifp; /* inode fork pointer */
4352 xfs_extnum_t nextents; /* number of extent entries */
4353
4354 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4355 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4356 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
4357 return XFS_ERROR(EIO);
4358 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4359 *last_block = 0;
4360 return 0;
4361 }
4362 ifp = XFS_IFORK_PTR(ip, whichfork);
4363 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4364 (error = xfs_iread_extents(tp, ip, whichfork)))
4365 return error;
4366 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4367 if (!nextents) {
4368 *last_block = 0;
4369 return 0;
4370 }
4371 base = &ifp->if_u1.if_extents[0];
4372 ASSERT(base != NULL);
4373 ep = &base[nextents - 1];
4374 *last_block = xfs_bmbt_get_startoff(ep) + xfs_bmbt_get_blockcount(ep);
4375 return 0;
4376 }
4377
4378 /*
4379 * Returns whether the selected fork of the inode has exactly one
4380 * block or not. For the data fork we check this matches di_size,
4381 * implying the file's range is 0..bsize-1.
4382 */
4383 int /* 1=>1 block, 0=>otherwise */
4384 xfs_bmap_one_block(
4385 xfs_inode_t *ip, /* incore inode */
4386 int whichfork) /* data or attr fork */
4387 {
4388 xfs_bmbt_rec_t *ep; /* ptr to fork's extent */
4389 xfs_ifork_t *ifp; /* inode fork pointer */
4390 int rval; /* return value */
4391 xfs_bmbt_irec_t s; /* internal version of extent */
4392
4393 #ifndef DEBUG
4394 if (whichfork == XFS_DATA_FORK)
4395 return ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize;
4396 #endif /* !DEBUG */
4397 if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
4398 return 0;
4399 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
4400 return 0;
4401 ifp = XFS_IFORK_PTR(ip, whichfork);
4402 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
4403 ep = ifp->if_u1.if_extents;
4404 xfs_bmbt_get_all(ep, &s);
4405 rval = s.br_startoff == 0 && s.br_blockcount == 1;
4406 if (rval && whichfork == XFS_DATA_FORK)
4407 ASSERT(ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize);
4408 return rval;
4409 }
4410
4411 /*
4412 * Read in the extents to if_extents.
4413 * All inode fields are set up by caller, we just traverse the btree
4414 * and copy the records in. If the file system cannot contain unwritten
4415 * extents, the records are checked for no "state" flags.
4416 */
4417 int /* error */
4418 xfs_bmap_read_extents(
4419 xfs_trans_t *tp, /* transaction pointer */
4420 xfs_inode_t *ip, /* incore inode */
4421 int whichfork) /* data or attr fork */
4422 {
4423 xfs_bmbt_block_t *block; /* current btree block */
4424 xfs_fsblock_t bno; /* block # of "block" */
4425 xfs_buf_t *bp; /* buffer for "block" */
4426 int error; /* error return value */
4427 xfs_exntfmt_t exntf; /* XFS_EXTFMT_NOSTATE, if checking */
4428 #ifdef XFS_BMAP_TRACE
4429 static char fname[] = "xfs_bmap_read_extents";
4430 #endif
4431 xfs_extnum_t i, j; /* index into the extents list */
4432 xfs_ifork_t *ifp; /* fork structure */
4433 int level; /* btree level, for checking */
4434 xfs_mount_t *mp; /* file system mount structure */
4435 xfs_bmbt_ptr_t *pp; /* pointer to block address */
4436 /* REFERENCED */
4437 xfs_extnum_t room; /* number of entries there's room for */
4438 xfs_bmbt_rec_t *trp; /* target record pointer */
4439
4440 bno = NULLFSBLOCK;
4441 mp = ip->i_mount;
4442 ifp = XFS_IFORK_PTR(ip, whichfork);
4443 exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE :
4444 XFS_EXTFMT_INODE(ip);
4445 block = ifp->if_broot;
4446 /*
4447 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
4448 */
4449 level = be16_to_cpu(block->bb_level);
4450 ASSERT(level > 0);
4451 pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
4452 ASSERT(INT_GET(*pp, ARCH_CONVERT) != NULLDFSBNO);
4453 ASSERT(XFS_FSB_TO_AGNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agcount);
4454 ASSERT(XFS_FSB_TO_AGBNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agblocks);
4455 bno = INT_GET(*pp, ARCH_CONVERT);
4456 /*
4457 * Go down the tree until leaf level is reached, following the first
4458 * pointer (leftmost) at each level.
4459 */
4460 while (level-- > 0) {
4461 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4462 XFS_BMAP_BTREE_REF)))
4463 return error;
4464 block = XFS_BUF_TO_BMBT_BLOCK(bp);
4465 XFS_WANT_CORRUPTED_GOTO(
4466 XFS_BMAP_SANITY_CHECK(mp, block, level),
4467 error0);
4468 if (level == 0)
4469 break;
4470 pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt, block,
4471 1, mp->m_bmap_dmxr[1]);
4472 XFS_WANT_CORRUPTED_GOTO(
4473 XFS_FSB_SANITY_CHECK(mp, INT_GET(*pp, ARCH_CONVERT)),
4474 error0);
4475 bno = INT_GET(*pp, ARCH_CONVERT);
4476 xfs_trans_brelse(tp, bp);
4477 }
4478 /*
4479 * Here with bp and block set to the leftmost leaf node in the tree.
4480 */
4481 room = ifp->if_bytes / (uint)sizeof(*trp);
4482 trp = ifp->if_u1.if_extents;
4483 i = 0;
4484 /*
4485 * Loop over all leaf nodes. Copy information to the extent list.
4486 */
4487 for (;;) {
4488 xfs_bmbt_rec_t *frp, *temp;
4489 xfs_fsblock_t nextbno;
4490 xfs_extnum_t num_recs;
4491
4492
4493 num_recs = be16_to_cpu(block->bb_numrecs);
4494 if (unlikely(i + num_recs > room)) {
4495 ASSERT(i + num_recs <= room);
4496 xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
4497 "corrupt dinode %Lu, (btree extents).",
4498 (unsigned long long) ip->i_ino);
4499 XFS_ERROR_REPORT("xfs_bmap_read_extents(1)",
4500 XFS_ERRLEVEL_LOW,
4501 ip->i_mount);
4502 goto error0;
4503 }
4504 XFS_WANT_CORRUPTED_GOTO(
4505 XFS_BMAP_SANITY_CHECK(mp, block, 0),
4506 error0);
4507 /*
4508 * Read-ahead the next leaf block, if any.
4509 */
4510 nextbno = be64_to_cpu(block->bb_rightsib);
4511 if (nextbno != NULLFSBLOCK)
4512 xfs_btree_reada_bufl(mp, nextbno, 1);
4513 /*
4514 * Copy records into the extent list.
4515 */
4516 frp = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt,
4517 block, 1, mp->m_bmap_dmxr[0]);
4518 temp = trp;
4519 for (j = 0; j < num_recs; j++, frp++, trp++) {
4520 trp->l0 = INT_GET(frp->l0, ARCH_CONVERT);
4521 trp->l1 = INT_GET(frp->l1, ARCH_CONVERT);
4522 }
4523 if (exntf == XFS_EXTFMT_NOSTATE) {
4524 /*
4525 * Check all attribute bmap btree records and
4526 * any "older" data bmap btree records for a
4527 * set bit in the "extent flag" position.
4528 */
4529 if (unlikely(xfs_check_nostate_extents(temp, num_recs))) {
4530 XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
4531 XFS_ERRLEVEL_LOW,
4532 ip->i_mount);
4533 goto error0;
4534 }
4535 }
4536 i += num_recs;
4537 xfs_trans_brelse(tp, bp);
4538 bno = nextbno;
4539 /*
4540 * If we've reached the end, stop.
4541 */
4542 if (bno == NULLFSBLOCK)
4543 break;
4544 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4545 XFS_BMAP_BTREE_REF)))
4546 return error;
4547 block = XFS_BUF_TO_BMBT_BLOCK(bp);
4548 }
4549 ASSERT(i == ifp->if_bytes / (uint)sizeof(*trp));
4550 ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork));
4551 xfs_bmap_trace_exlist(fname, ip, i, whichfork);
4552 return 0;
4553 error0:
4554 xfs_trans_brelse(tp, bp);
4555 return XFS_ERROR(EFSCORRUPTED);
4556 }
4557
4558 #ifdef XFS_BMAP_TRACE
4559 /*
4560 * Add bmap trace insert entries for all the contents of the extent list.
4561 */
4562 void
4563 xfs_bmap_trace_exlist(
4564 char *fname, /* function name */
4565 xfs_inode_t *ip, /* incore inode pointer */
4566 xfs_extnum_t cnt, /* count of entries in the list */
4567 int whichfork) /* data or attr fork */
4568 {
4569 xfs_bmbt_rec_t *base; /* base of extent list */
4570 xfs_bmbt_rec_t *ep; /* current entry in extent list */
4571 xfs_extnum_t idx; /* extent list entry number */
4572 xfs_ifork_t *ifp; /* inode fork pointer */
4573 xfs_bmbt_irec_t s; /* extent list record */
4574
4575 ifp = XFS_IFORK_PTR(ip, whichfork);
4576 ASSERT(cnt == ifp->if_bytes / (uint)sizeof(*base));
4577 base = ifp->if_u1.if_extents;
4578 for (idx = 0, ep = base; idx < cnt; idx++, ep++) {
4579 xfs_bmbt_get_all(ep, &s);
4580 xfs_bmap_trace_insert(fname, "exlist", ip, idx, 1, &s, NULL,
4581 whichfork);
4582 }
4583 }
4584 #endif
4585
4586 #ifdef DEBUG
4587 /*
4588 * Validate that the bmbt_irecs being returned from bmapi are valid
4589 * given the callers original parameters. Specifically check the
4590 * ranges of the returned irecs to ensure that they only extent beyond
4591 * the given parameters if the XFS_BMAPI_ENTIRE flag was set.
4592 */
4593 STATIC void
4594 xfs_bmap_validate_ret(
4595 xfs_fileoff_t bno,
4596 xfs_filblks_t len,
4597 int flags,
4598 xfs_bmbt_irec_t *mval,
4599 int nmap,
4600 int ret_nmap)
4601 {
4602 int i; /* index to map values */
4603
4604 ASSERT(ret_nmap <= nmap);
4605
4606 for (i = 0; i < ret_nmap; i++) {
4607 ASSERT(mval[i].br_blockcount > 0);
4608 if (!(flags & XFS_BMAPI_ENTIRE)) {
4609 ASSERT(mval[i].br_startoff >= bno);
4610 ASSERT(mval[i].br_blockcount <= len);
4611 ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
4612 bno + len);
4613 } else {
4614 ASSERT(mval[i].br_startoff < bno + len);
4615 ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
4616 bno);
4617 }
4618 ASSERT(i == 0 ||
4619 mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
4620 mval[i].br_startoff);
4621 if ((flags & XFS_BMAPI_WRITE) && !(flags & XFS_BMAPI_DELAY))
4622 ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
4623 mval[i].br_startblock != HOLESTARTBLOCK);
4624 ASSERT(mval[i].br_state == XFS_EXT_NORM ||
4625 mval[i].br_state == XFS_EXT_UNWRITTEN);
4626 }
4627 }
4628 #endif /* DEBUG */
4629
4630
4631 /*
4632 * Map file blocks to filesystem blocks.
4633 * File range is given by the bno/len pair.
4634 * Adds blocks to file if a write ("flags & XFS_BMAPI_WRITE" set)
4635 * into a hole or past eof.
4636 * Only allocates blocks from a single allocation group,
4637 * to avoid locking problems.
4638 * The returned value in "firstblock" from the first call in a transaction
4639 * must be remembered and presented to subsequent calls in "firstblock".
4640 * An upper bound for the number of blocks to be allocated is supplied to
4641 * the first call in "total"; if no allocation group has that many free
4642 * blocks then the call will fail (return NULLFSBLOCK in "firstblock").
4643 */
4644 int /* error */
4645 xfs_bmapi(
4646 xfs_trans_t *tp, /* transaction pointer */
4647 xfs_inode_t *ip, /* incore inode */
4648 xfs_fileoff_t bno, /* starting file offs. mapped */
4649 xfs_filblks_t len, /* length to map in file */
4650 int flags, /* XFS_BMAPI_... */
4651 xfs_fsblock_t *firstblock, /* first allocated block
4652 controls a.g. for allocs */
4653 xfs_extlen_t total, /* total blocks needed */
4654 xfs_bmbt_irec_t *mval, /* output: map values */
4655 int *nmap, /* i/o: mval size/count */
4656 xfs_bmap_free_t *flist) /* i/o: list extents to free */
4657 {
4658 xfs_fsblock_t abno; /* allocated block number */
4659 xfs_extlen_t alen; /* allocated extent length */
4660 xfs_fileoff_t aoff; /* allocated file offset */
4661 xfs_bmalloca_t bma; /* args for xfs_bmap_alloc */
4662 xfs_btree_cur_t *cur; /* bmap btree cursor */
4663 xfs_fileoff_t end; /* end of mapped file region */
4664 int eof; /* we've hit the end of extent list */
4665 char contig; /* allocation must be one extent */
4666 char delay; /* this request is for delayed alloc */
4667 char exact; /* don't do all of wasdelayed extent */
4668 char convert; /* unwritten extent I/O completion */
4669 xfs_bmbt_rec_t *ep; /* extent list entry pointer */
4670 int error; /* error return */
4671 xfs_bmbt_irec_t got; /* current extent list record */
4672 xfs_ifork_t *ifp; /* inode fork pointer */
4673 xfs_extlen_t indlen; /* indirect blocks length */
4674 xfs_extnum_t lastx; /* last useful extent number */
4675 int logflags; /* flags for transaction logging */
4676 xfs_extlen_t minleft; /* min blocks left after allocation */
4677 xfs_extlen_t minlen; /* min allocation size */
4678 xfs_mount_t *mp; /* xfs mount structure */
4679 int n; /* current extent index */
4680 int nallocs; /* number of extents alloc\'d */
4681 xfs_extnum_t nextents; /* number of extents in file */
4682 xfs_fileoff_t obno; /* old block number (offset) */
4683 xfs_bmbt_irec_t prev; /* previous extent list record */
4684 int tmp_logflags; /* temp flags holder */
4685 int whichfork; /* data or attr fork */
4686 char inhole; /* current location is hole in file */
4687 char stateless; /* ignore state flag set */
4688 char trim; /* output trimmed to match range */
4689 char userdata; /* allocating non-metadata */
4690 char wasdelay; /* old extent was delayed */
4691 char wr; /* this is a write request */
4692 char rt; /* this is a realtime file */
4693 char rsvd; /* OK to allocate reserved blocks */
4694 #ifdef DEBUG
4695 xfs_fileoff_t orig_bno; /* original block number value */
4696 int orig_flags; /* original flags arg value */
4697 xfs_filblks_t orig_len; /* original value of len arg */
4698 xfs_bmbt_irec_t *orig_mval; /* original value of mval */
4699 int orig_nmap; /* original value of *nmap */
4700
4701 orig_bno = bno;
4702 orig_len = len;
4703 orig_flags = flags;
4704 orig_mval = mval;
4705 orig_nmap = *nmap;
4706 #endif
4707 ASSERT(*nmap >= 1);
4708 ASSERT(*nmap <= XFS_BMAP_MAX_NMAP || !(flags & XFS_BMAPI_WRITE));
4709 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4710 XFS_ATTR_FORK : XFS_DATA_FORK;
4711 mp = ip->i_mount;
4712 if (unlikely(XFS_TEST_ERROR(
4713 (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4714 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4715 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL),
4716 mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
4717 XFS_ERROR_REPORT("xfs_bmapi", XFS_ERRLEVEL_LOW, mp);
4718 return XFS_ERROR(EFSCORRUPTED);
4719 }
4720 if (XFS_FORCED_SHUTDOWN(mp))
4721 return XFS_ERROR(EIO);
4722 rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
4723 ifp = XFS_IFORK_PTR(ip, whichfork);
4724 ASSERT(ifp->if_ext_max ==
4725 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
4726 if ((wr = (flags & XFS_BMAPI_WRITE)) != 0)
4727 XFS_STATS_INC(xs_blk_mapw);
4728 else
4729 XFS_STATS_INC(xs_blk_mapr);
4730 delay = (flags & XFS_BMAPI_DELAY) != 0;
4731 trim = (flags & XFS_BMAPI_ENTIRE) == 0;
4732 userdata = (flags & XFS_BMAPI_METADATA) == 0;
4733 convert = (flags & XFS_BMAPI_CONVERT) != 0;
4734 exact = (flags & XFS_BMAPI_EXACT) != 0;
4735 rsvd = (flags & XFS_BMAPI_RSVBLOCKS) != 0;
4736 contig = (flags & XFS_BMAPI_CONTIG) != 0;
4737 /*
4738 * stateless is used to combine extents which
4739 * differ only due to the state of the extents.
4740 * This technique is used from xfs_getbmap()
4741 * when the caller does not wish to see the
4742 * separation (which is the default).
4743 *
4744 * This technique is also used when writing a
4745 * buffer which has been partially written,
4746 * (usually by being flushed during a chunkread),
4747 * to ensure one write takes place. This also
4748 * prevents a change in the xfs inode extents at
4749 * this time, intentionally. This change occurs
4750 * on completion of the write operation, in
4751 * xfs_strat_comp(), where the xfs_bmapi() call
4752 * is transactioned, and the extents combined.
4753 */
4754 stateless = (flags & XFS_BMAPI_IGSTATE) != 0;
4755 if (stateless && wr) /* if writing unwritten space, no */
4756 wr = 0; /* allocations are allowed */
4757 ASSERT(wr || !delay);
4758 logflags = 0;
4759 nallocs = 0;
4760 cur = NULL;
4761 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4762 ASSERT(wr && tp);
4763 if ((error = xfs_bmap_local_to_extents(tp, ip,
4764 firstblock, total, &logflags, whichfork)))
4765 goto error0;
4766 }
4767 if (wr && *firstblock == NULLFSBLOCK) {
4768 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
4769 minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1;
4770 else
4771 minleft = 1;
4772 } else
4773 minleft = 0;
4774 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4775 (error = xfs_iread_extents(tp, ip, whichfork)))
4776 goto error0;
4777 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
4778 &prev);
4779 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4780 n = 0;
4781 end = bno + len;
4782 obno = bno;
4783 bma.ip = NULL;
4784 while (bno < end && n < *nmap) {
4785 /*
4786 * Reading past eof, act as though there's a hole
4787 * up to end.
4788 */
4789 if (eof && !wr)
4790 got.br_startoff = end;
4791 inhole = eof || got.br_startoff > bno;
4792 wasdelay = wr && !inhole && !delay &&
4793 ISNULLSTARTBLOCK(got.br_startblock);
4794 /*
4795 * First, deal with the hole before the allocated space
4796 * that we found, if any.
4797 */
4798 if (wr && (inhole || wasdelay)) {
4799 /*
4800 * For the wasdelay case, we could also just
4801 * allocate the stuff asked for in this bmap call
4802 * but that wouldn't be as good.
4803 */
4804 if (wasdelay && !exact) {
4805 alen = (xfs_extlen_t)got.br_blockcount;
4806 aoff = got.br_startoff;
4807 if (lastx != NULLEXTNUM && lastx) {
4808 ep = &ifp->if_u1.if_extents[lastx - 1];
4809 xfs_bmbt_get_all(ep, &prev);
4810 }
4811 } else if (wasdelay) {
4812 alen = (xfs_extlen_t)
4813 XFS_FILBLKS_MIN(len,
4814 (got.br_startoff +
4815 got.br_blockcount) - bno);
4816 aoff = bno;
4817 } else {
4818 alen = (xfs_extlen_t)
4819 XFS_FILBLKS_MIN(len, MAXEXTLEN);
4820 if (!eof)
4821 alen = (xfs_extlen_t)
4822 XFS_FILBLKS_MIN(alen,
4823 got.br_startoff - bno);
4824 aoff = bno;
4825 }
4826 minlen = contig ? alen : 1;
4827 if (delay) {
4828 xfs_extlen_t extsz;
4829
4830 /* Figure out the extent size, adjust alen */
4831 if (rt) {
4832 if (!(extsz = ip->i_d.di_extsize))
4833 extsz = mp->m_sb.sb_rextsize;
4834 } else {
4835 extsz = ip->i_d.di_extsize;
4836 }
4837 if (extsz) {
4838 error = xfs_bmap_extsize_align(mp,
4839 &got, &prev, extsz,
4840 rt, eof, delay, convert,
4841 &aoff, &alen);
4842 ASSERT(!error);
4843 }
4844
4845 if (rt)
4846 extsz = alen / mp->m_sb.sb_rextsize;
4847
4848 /*
4849 * Make a transaction-less quota reservation for
4850 * delayed allocation blocks. This number gets
4851 * adjusted later.
4852 * We return EDQUOT if we haven't allocated
4853 * blks already inside this loop;
4854 */
4855 if (XFS_TRANS_RESERVE_QUOTA_NBLKS(
4856 mp, NULL, ip, (long)alen, 0,
4857 rt ? XFS_QMOPT_RES_RTBLKS :
4858 XFS_QMOPT_RES_REGBLKS)) {
4859 if (n == 0) {
4860 *nmap = 0;
4861 ASSERT(cur == NULL);
4862 return XFS_ERROR(EDQUOT);
4863 }
4864 break;
4865 }
4866
4867 /*
4868 * Split changing sb for alen and indlen since
4869 * they could be coming from different places.
4870 */
4871 indlen = (xfs_extlen_t)
4872 xfs_bmap_worst_indlen(ip, alen);
4873 ASSERT(indlen > 0);
4874
4875 if (rt) {
4876 error = xfs_mod_incore_sb(mp,
4877 XFS_SBS_FREXTENTS,
4878 -(extsz), rsvd);
4879 } else {
4880 error = xfs_mod_incore_sb(mp,
4881 XFS_SBS_FDBLOCKS,
4882 -(alen), rsvd);
4883 }
4884 if (!error) {
4885 error = xfs_mod_incore_sb(mp,
4886 XFS_SBS_FDBLOCKS,
4887 -(indlen), rsvd);
4888 if (error && rt)
4889 xfs_mod_incore_sb(mp,
4890 XFS_SBS_FREXTENTS,
4891 extsz, rsvd);
4892 else if (error)
4893 xfs_mod_incore_sb(mp,
4894 XFS_SBS_FDBLOCKS,
4895 alen, rsvd);
4896 }
4897
4898 if (error) {
4899 if (XFS_IS_QUOTA_ON(mp))
4900 /* unreserve the blocks now */
4901 (void)
4902 XFS_TRANS_UNRESERVE_QUOTA_NBLKS(
4903 mp, NULL, ip,
4904 (long)alen, 0, rt ?
4905 XFS_QMOPT_RES_RTBLKS :
4906 XFS_QMOPT_RES_REGBLKS);
4907 break;
4908 }
4909
4910 ip->i_delayed_blks += alen;
4911 abno = NULLSTARTBLOCK(indlen);
4912 } else {
4913 /*
4914 * If first time, allocate and fill in
4915 * once-only bma fields.
4916 */
4917 if (bma.ip == NULL) {
4918 bma.tp = tp;
4919 bma.ip = ip;
4920 bma.prevp = &prev;
4921 bma.gotp = &got;
4922 bma.total = total;
4923 bma.userdata = 0;
4924 }
4925 /* Indicate if this is the first user data
4926 * in the file, or just any user data.
4927 */
4928 if (userdata) {
4929 bma.userdata = (aoff == 0) ?
4930 XFS_ALLOC_INITIAL_USER_DATA :
4931 XFS_ALLOC_USERDATA;
4932 }
4933 /*
4934 * Fill in changeable bma fields.
4935 */
4936 bma.eof = eof;
4937 bma.firstblock = *firstblock;
4938 bma.alen = alen;
4939 bma.off = aoff;
4940 bma.conv = convert;
4941 bma.wasdel = wasdelay;
4942 bma.minlen = minlen;
4943 bma.low = flist->xbf_low;
4944 bma.minleft = minleft;
4945 /*
4946 * Only want to do the alignment at the
4947 * eof if it is userdata and allocation length
4948 * is larger than a stripe unit.
4949 */
4950 if (mp->m_dalign && alen >= mp->m_dalign &&
4951 userdata && whichfork == XFS_DATA_FORK) {
4952 if ((error = xfs_bmap_isaeof(ip, aoff,
4953 whichfork, &bma.aeof)))
4954 goto error0;
4955 } else
4956 bma.aeof = 0;
4957 /*
4958 * Call allocator.
4959 */
4960 if ((error = xfs_bmap_alloc(&bma)))
4961 goto error0;
4962 /*
4963 * Copy out result fields.
4964 */
4965 abno = bma.rval;
4966 if ((flist->xbf_low = bma.low))
4967 minleft = 0;
4968 alen = bma.alen;
4969 aoff = bma.off;
4970 ASSERT(*firstblock == NULLFSBLOCK ||
4971 XFS_FSB_TO_AGNO(mp, *firstblock) ==
4972 XFS_FSB_TO_AGNO(mp, bma.firstblock) ||
4973 (flist->xbf_low &&
4974 XFS_FSB_TO_AGNO(mp, *firstblock) <
4975 XFS_FSB_TO_AGNO(mp, bma.firstblock)));
4976 *firstblock = bma.firstblock;
4977 if (cur)
4978 cur->bc_private.b.firstblock =
4979 *firstblock;
4980 if (abno == NULLFSBLOCK)
4981 break;
4982 if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
4983 cur = xfs_btree_init_cursor(mp,
4984 tp, NULL, 0, XFS_BTNUM_BMAP,
4985 ip, whichfork);
4986 cur->bc_private.b.firstblock =
4987 *firstblock;
4988 cur->bc_private.b.flist = flist;
4989 }
4990 /*
4991 * Bump the number of extents we've allocated
4992 * in this call.
4993 */
4994 nallocs++;
4995 }
4996 if (cur)
4997 cur->bc_private.b.flags =
4998 wasdelay ? XFS_BTCUR_BPRV_WASDEL : 0;
4999 got.br_startoff = aoff;
5000 got.br_startblock = abno;
5001 got.br_blockcount = alen;
5002 got.br_state = XFS_EXT_NORM; /* assume normal */
5003 /*
5004 * Determine state of extent, and the filesystem.
5005 * A wasdelay extent has been initialized, so
5006 * shouldn't be flagged as unwritten.
5007 */
5008 if (wr && XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
5009 if (!wasdelay && (flags & XFS_BMAPI_PREALLOC))
5010 got.br_state = XFS_EXT_UNWRITTEN;
5011 }
5012 error = xfs_bmap_add_extent(ip, lastx, &cur, &got,
5013 firstblock, flist, &tmp_logflags, whichfork,
5014 rsvd);
5015 logflags |= tmp_logflags;
5016 if (error)
5017 goto error0;
5018 lastx = ifp->if_lastex;
5019 ep = &ifp->if_u1.if_extents[lastx];
5020 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5021 xfs_bmbt_get_all(ep, &got);
5022 ASSERT(got.br_startoff <= aoff);
5023 ASSERT(got.br_startoff + got.br_blockcount >=
5024 aoff + alen);
5025 #ifdef DEBUG
5026 if (delay) {
5027 ASSERT(ISNULLSTARTBLOCK(got.br_startblock));
5028 ASSERT(STARTBLOCKVAL(got.br_startblock) > 0);
5029 }
5030 ASSERT(got.br_state == XFS_EXT_NORM ||
5031 got.br_state == XFS_EXT_UNWRITTEN);
5032 #endif
5033 /*
5034 * Fall down into the found allocated space case.
5035 */
5036 } else if (inhole) {
5037 /*
5038 * Reading in a hole.
5039 */
5040 mval->br_startoff = bno;
5041 mval->br_startblock = HOLESTARTBLOCK;
5042 mval->br_blockcount =
5043 XFS_FILBLKS_MIN(len, got.br_startoff - bno);
5044 mval->br_state = XFS_EXT_NORM;
5045 bno += mval->br_blockcount;
5046 len -= mval->br_blockcount;
5047 mval++;
5048 n++;
5049 continue;
5050 }
5051 /*
5052 * Then deal with the allocated space we found.
5053 */
5054 ASSERT(ep != NULL);
5055 if (trim && (got.br_startoff + got.br_blockcount > obno)) {
5056 if (obno > bno)
5057 bno = obno;
5058 ASSERT((bno >= obno) || (n == 0));
5059 ASSERT(bno < end);
5060 mval->br_startoff = bno;
5061 if (ISNULLSTARTBLOCK(got.br_startblock)) {
5062 ASSERT(!wr || delay);
5063 mval->br_startblock = DELAYSTARTBLOCK;
5064 } else
5065 mval->br_startblock =
5066 got.br_startblock +
5067 (bno - got.br_startoff);
5068 /*
5069 * Return the minimum of what we got and what we
5070 * asked for for the length. We can use the len
5071 * variable here because it is modified below
5072 * and we could have been there before coming
5073 * here if the first part of the allocation
5074 * didn't overlap what was asked for.
5075 */
5076 mval->br_blockcount =
5077 XFS_FILBLKS_MIN(end - bno, got.br_blockcount -
5078 (bno - got.br_startoff));
5079 mval->br_state = got.br_state;
5080 ASSERT(mval->br_blockcount <= len);
5081 } else {
5082 *mval = got;
5083 if (ISNULLSTARTBLOCK(mval->br_startblock)) {
5084 ASSERT(!wr || delay);
5085 mval->br_startblock = DELAYSTARTBLOCK;
5086 }
5087 }
5088
5089 /*
5090 * Check if writing previously allocated but
5091 * unwritten extents.
5092 */
5093 if (wr && mval->br_state == XFS_EXT_UNWRITTEN &&
5094 ((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_DELAY)) == 0)) {
5095 /*
5096 * Modify (by adding) the state flag, if writing.
5097 */
5098 ASSERT(mval->br_blockcount <= len);
5099 if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
5100 cur = xfs_btree_init_cursor(mp,
5101 tp, NULL, 0, XFS_BTNUM_BMAP,
5102 ip, whichfork);
5103 cur->bc_private.b.firstblock =
5104 *firstblock;
5105 cur->bc_private.b.flist = flist;
5106 }
5107 mval->br_state = XFS_EXT_NORM;
5108 error = xfs_bmap_add_extent(ip, lastx, &cur, mval,
5109 firstblock, flist, &tmp_logflags, whichfork,
5110 rsvd);
5111 logflags |= tmp_logflags;
5112 if (error)
5113 goto error0;
5114 lastx = ifp->if_lastex;
5115 ep = &ifp->if_u1.if_extents[lastx];
5116 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5117 xfs_bmbt_get_all(ep, &got);
5118 /*
5119 * We may have combined previously unwritten
5120 * space with written space, so generate
5121 * another request.
5122 */
5123 if (mval->br_blockcount < len)
5124 continue;
5125 }
5126
5127 ASSERT(!trim ||
5128 ((mval->br_startoff + mval->br_blockcount) <= end));
5129 ASSERT(!trim || (mval->br_blockcount <= len) ||
5130 (mval->br_startoff < obno));
5131 bno = mval->br_startoff + mval->br_blockcount;
5132 len = end - bno;
5133 if (n > 0 && mval->br_startoff == mval[-1].br_startoff) {
5134 ASSERT(mval->br_startblock == mval[-1].br_startblock);
5135 ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
5136 ASSERT(mval->br_state == mval[-1].br_state);
5137 mval[-1].br_blockcount = mval->br_blockcount;
5138 mval[-1].br_state = mval->br_state;
5139 } else if (n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
5140 mval[-1].br_startblock != DELAYSTARTBLOCK &&
5141 mval[-1].br_startblock != HOLESTARTBLOCK &&
5142 mval->br_startblock ==
5143 mval[-1].br_startblock + mval[-1].br_blockcount &&
5144 (stateless || mval[-1].br_state == mval->br_state)) {
5145 ASSERT(mval->br_startoff ==
5146 mval[-1].br_startoff + mval[-1].br_blockcount);
5147 mval[-1].br_blockcount += mval->br_blockcount;
5148 } else if (n > 0 &&
5149 mval->br_startblock == DELAYSTARTBLOCK &&
5150 mval[-1].br_startblock == DELAYSTARTBLOCK &&
5151 mval->br_startoff ==
5152 mval[-1].br_startoff + mval[-1].br_blockcount) {
5153 mval[-1].br_blockcount += mval->br_blockcount;
5154 mval[-1].br_state = mval->br_state;
5155 } else if (!((n == 0) &&
5156 ((mval->br_startoff + mval->br_blockcount) <=
5157 obno))) {
5158 mval++;
5159 n++;
5160 }
5161 /*
5162 * If we're done, stop now. Stop when we've allocated
5163 * XFS_BMAP_MAX_NMAP extents no matter what. Otherwise
5164 * the transaction may get too big.
5165 */
5166 if (bno >= end || n >= *nmap || nallocs >= *nmap)
5167 break;
5168 /*
5169 * Else go on to the next record.
5170 */
5171 ep++;
5172 lastx++;
5173 if (lastx >= nextents) {
5174 eof = 1;
5175 prev = got;
5176 } else
5177 xfs_bmbt_get_all(ep, &got);
5178 }
5179 ifp->if_lastex = lastx;
5180 *nmap = n;
5181 /*
5182 * Transform from btree to extents, give it cur.
5183 */
5184 if (tp && XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
5185 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
5186 ASSERT(wr && cur);
5187 error = xfs_bmap_btree_to_extents(tp, ip, cur,
5188 &tmp_logflags, whichfork);
5189 logflags |= tmp_logflags;
5190 if (error)
5191 goto error0;
5192 }
5193 ASSERT(ifp->if_ext_max ==
5194 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5195 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
5196 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max);
5197 error = 0;
5198
5199 error0:
5200 /*
5201 * Log everything. Do this after conversion, there's no point in
5202 * logging the extent list if we've converted to btree format.
5203 */
5204 if ((logflags & XFS_ILOG_FEXT(whichfork)) &&
5205 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5206 logflags &= ~XFS_ILOG_FEXT(whichfork);
5207 else if ((logflags & XFS_ILOG_FBROOT(whichfork)) &&
5208 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5209 logflags &= ~XFS_ILOG_FBROOT(whichfork);
5210 /*
5211 * Log whatever the flags say, even if error. Otherwise we might miss
5212 * detecting a case where the data is changed, there's an error,
5213 * and it's not logged so we don't shutdown when we should.
5214 */
5215 if (logflags) {
5216 ASSERT(tp && wr);
5217 xfs_trans_log_inode(tp, ip, logflags);
5218 }
5219 if (cur) {
5220 if (!error) {
5221 ASSERT(*firstblock == NULLFSBLOCK ||
5222 XFS_FSB_TO_AGNO(mp, *firstblock) ==
5223 XFS_FSB_TO_AGNO(mp,
5224 cur->bc_private.b.firstblock) ||
5225 (flist->xbf_low &&
5226 XFS_FSB_TO_AGNO(mp, *firstblock) <
5227 XFS_FSB_TO_AGNO(mp,
5228 cur->bc_private.b.firstblock)));
5229 *firstblock = cur->bc_private.b.firstblock;
5230 }
5231 xfs_btree_del_cursor(cur,
5232 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5233 }
5234 if (!error)
5235 xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
5236 orig_nmap, *nmap);
5237 return error;
5238 }
5239
5240 /*
5241 * Map file blocks to filesystem blocks, simple version.
5242 * One block (extent) only, read-only.
5243 * For flags, only the XFS_BMAPI_ATTRFORK flag is examined.
5244 * For the other flag values, the effect is as if XFS_BMAPI_METADATA
5245 * was set and all the others were clear.
5246 */
5247 int /* error */
5248 xfs_bmapi_single(
5249 xfs_trans_t *tp, /* transaction pointer */
5250 xfs_inode_t *ip, /* incore inode */
5251 int whichfork, /* data or attr fork */
5252 xfs_fsblock_t *fsb, /* output: mapped block */
5253 xfs_fileoff_t bno) /* starting file offs. mapped */
5254 {
5255 int eof; /* we've hit the end of extent list */
5256 int error; /* error return */
5257 xfs_bmbt_irec_t got; /* current extent list record */
5258 xfs_ifork_t *ifp; /* inode fork pointer */
5259 xfs_extnum_t lastx; /* last useful extent number */
5260 xfs_bmbt_irec_t prev; /* previous extent list record */
5261
5262 ifp = XFS_IFORK_PTR(ip, whichfork);
5263 if (unlikely(
5264 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
5265 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)) {
5266 XFS_ERROR_REPORT("xfs_bmapi_single", XFS_ERRLEVEL_LOW,
5267 ip->i_mount);
5268 return XFS_ERROR(EFSCORRUPTED);
5269 }
5270 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
5271 return XFS_ERROR(EIO);
5272 XFS_STATS_INC(xs_blk_mapr);
5273 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5274 (error = xfs_iread_extents(tp, ip, whichfork)))
5275 return error;
5276 (void)xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
5277 &prev);
5278 /*
5279 * Reading past eof, act as though there's a hole
5280 * up to end.
5281 */
5282 if (eof || got.br_startoff > bno) {
5283 *fsb = NULLFSBLOCK;
5284 return 0;
5285 }
5286 ASSERT(!ISNULLSTARTBLOCK(got.br_startblock));
5287 ASSERT(bno < got.br_startoff + got.br_blockcount);
5288 *fsb = got.br_startblock + (bno - got.br_startoff);
5289 ifp->if_lastex = lastx;
5290 return 0;
5291 }
5292
5293 /*
5294 * Unmap (remove) blocks from a file.
5295 * If nexts is nonzero then the number of extents to remove is limited to
5296 * that value. If not all extents in the block range can be removed then
5297 * *done is set.
5298 */
5299 int /* error */
5300 xfs_bunmapi(
5301 xfs_trans_t *tp, /* transaction pointer */
5302 struct xfs_inode *ip, /* incore inode */
5303 xfs_fileoff_t bno, /* starting offset to unmap */
5304 xfs_filblks_t len, /* length to unmap in file */
5305 int flags, /* misc flags */
5306 xfs_extnum_t nexts, /* number of extents max */
5307 xfs_fsblock_t *firstblock, /* first allocated block
5308 controls a.g. for allocs */
5309 xfs_bmap_free_t *flist, /* i/o: list extents to free */
5310 int *done) /* set if not done yet */
5311 {
5312 xfs_btree_cur_t *cur; /* bmap btree cursor */
5313 xfs_bmbt_irec_t del; /* extent being deleted */
5314 int eof; /* is deleting at eof */
5315 xfs_bmbt_rec_t *ep; /* extent list entry pointer */
5316 int error; /* error return value */
5317 xfs_extnum_t extno; /* extent number in list */
5318 xfs_bmbt_irec_t got; /* current extent list entry */
5319 xfs_ifork_t *ifp; /* inode fork pointer */
5320 int isrt; /* freeing in rt area */
5321 xfs_extnum_t lastx; /* last extent index used */
5322 int logflags; /* transaction logging flags */
5323 xfs_extlen_t mod; /* rt extent offset */
5324 xfs_mount_t *mp; /* mount structure */
5325 xfs_extnum_t nextents; /* size of extent list */
5326 xfs_bmbt_irec_t prev; /* previous extent list entry */
5327 xfs_fileoff_t start; /* first file offset deleted */
5328 int tmp_logflags; /* partial logging flags */
5329 int wasdel; /* was a delayed alloc extent */
5330 int whichfork; /* data or attribute fork */
5331 int rsvd; /* OK to allocate reserved blocks */
5332 xfs_fsblock_t sum;
5333
5334 xfs_bunmap_trace(ip, bno, len, flags, (inst_t *)__return_address);
5335 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
5336 XFS_ATTR_FORK : XFS_DATA_FORK;
5337 ifp = XFS_IFORK_PTR(ip, whichfork);
5338 if (unlikely(
5339 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
5340 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
5341 XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW,
5342 ip->i_mount);
5343 return XFS_ERROR(EFSCORRUPTED);
5344 }
5345 mp = ip->i_mount;
5346 if (XFS_FORCED_SHUTDOWN(mp))
5347 return XFS_ERROR(EIO);
5348 rsvd = (flags & XFS_BMAPI_RSVBLOCKS) != 0;
5349 ASSERT(len > 0);
5350 ASSERT(nexts >= 0);
5351 ASSERT(ifp->if_ext_max ==
5352 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5353 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5354 (error = xfs_iread_extents(tp, ip, whichfork)))
5355 return error;
5356 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5357 if (nextents == 0) {
5358 *done = 1;
5359 return 0;
5360 }
5361 XFS_STATS_INC(xs_blk_unmap);
5362 isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
5363 start = bno;
5364 bno = start + len - 1;
5365 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
5366 &prev);
5367 /*
5368 * Check to see if the given block number is past the end of the
5369 * file, back up to the last block if so...
5370 */
5371 if (eof) {
5372 ep = &ifp->if_u1.if_extents[--lastx];
5373 xfs_bmbt_get_all(ep, &got);
5374 bno = got.br_startoff + got.br_blockcount - 1;
5375 }
5376 logflags = 0;
5377 if (ifp->if_flags & XFS_IFBROOT) {
5378 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
5379 cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
5380 whichfork);
5381 cur->bc_private.b.firstblock = *firstblock;
5382 cur->bc_private.b.flist = flist;
5383 cur->bc_private.b.flags = 0;
5384 } else
5385 cur = NULL;
5386 extno = 0;
5387 while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
5388 (nexts == 0 || extno < nexts)) {
5389 /*
5390 * Is the found extent after a hole in which bno lives?
5391 * Just back up to the previous extent, if so.
5392 */
5393 if (got.br_startoff > bno) {
5394 if (--lastx < 0)
5395 break;
5396 ep--;
5397 xfs_bmbt_get_all(ep, &got);
5398 }
5399 /*
5400 * Is the last block of this extent before the range
5401 * we're supposed to delete? If so, we're done.
5402 */
5403 bno = XFS_FILEOFF_MIN(bno,
5404 got.br_startoff + got.br_blockcount - 1);
5405 if (bno < start)
5406 break;
5407 /*
5408 * Then deal with the (possibly delayed) allocated space
5409 * we found.
5410 */
5411 ASSERT(ep != NULL);
5412 del = got;
5413 wasdel = ISNULLSTARTBLOCK(del.br_startblock);
5414 if (got.br_startoff < start) {
5415 del.br_startoff = start;
5416 del.br_blockcount -= start - got.br_startoff;
5417 if (!wasdel)
5418 del.br_startblock += start - got.br_startoff;
5419 }
5420 if (del.br_startoff + del.br_blockcount > bno + 1)
5421 del.br_blockcount = bno + 1 - del.br_startoff;
5422 sum = del.br_startblock + del.br_blockcount;
5423 if (isrt &&
5424 (mod = do_mod(sum, mp->m_sb.sb_rextsize))) {
5425 /*
5426 * Realtime extent not lined up at the end.
5427 * The extent could have been split into written
5428 * and unwritten pieces, or we could just be
5429 * unmapping part of it. But we can't really
5430 * get rid of part of a realtime extent.
5431 */
5432 if (del.br_state == XFS_EXT_UNWRITTEN ||
5433 !XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
5434 /*
5435 * This piece is unwritten, or we're not
5436 * using unwritten extents. Skip over it.
5437 */
5438 ASSERT(bno >= mod);
5439 bno -= mod > del.br_blockcount ?
5440 del.br_blockcount : mod;
5441 if (bno < got.br_startoff) {
5442 if (--lastx >= 0)
5443 xfs_bmbt_get_all(--ep, &got);
5444 }
5445 continue;
5446 }
5447 /*
5448 * It's written, turn it unwritten.
5449 * This is better than zeroing it.
5450 */
5451 ASSERT(del.br_state == XFS_EXT_NORM);
5452 ASSERT(xfs_trans_get_block_res(tp) > 0);
5453 /*
5454 * If this spans a realtime extent boundary,
5455 * chop it back to the start of the one we end at.
5456 */
5457 if (del.br_blockcount > mod) {
5458 del.br_startoff += del.br_blockcount - mod;
5459 del.br_startblock += del.br_blockcount - mod;
5460 del.br_blockcount = mod;
5461 }
5462 del.br_state = XFS_EXT_UNWRITTEN;
5463 error = xfs_bmap_add_extent(ip, lastx, &cur, &del,
5464 firstblock, flist, &logflags, XFS_DATA_FORK, 0);
5465 if (error)
5466 goto error0;
5467 goto nodelete;
5468 }
5469 if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) {
5470 /*
5471 * Realtime extent is lined up at the end but not
5472 * at the front. We'll get rid of full extents if
5473 * we can.
5474 */
5475 mod = mp->m_sb.sb_rextsize - mod;
5476 if (del.br_blockcount > mod) {
5477 del.br_blockcount -= mod;
5478 del.br_startoff += mod;
5479 del.br_startblock += mod;
5480 } else if ((del.br_startoff == start &&
5481 (del.br_state == XFS_EXT_UNWRITTEN ||
5482 xfs_trans_get_block_res(tp) == 0)) ||
5483 !XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
5484 /*
5485 * Can't make it unwritten. There isn't
5486 * a full extent here so just skip it.
5487 */
5488 ASSERT(bno >= del.br_blockcount);
5489 bno -= del.br_blockcount;
5490 if (bno < got.br_startoff) {
5491 if (--lastx >= 0)
5492 xfs_bmbt_get_all(--ep, &got);
5493 }
5494 continue;
5495 } else if (del.br_state == XFS_EXT_UNWRITTEN) {
5496 /*
5497 * This one is already unwritten.
5498 * It must have a written left neighbor.
5499 * Unwrite the killed part of that one and
5500 * try again.
5501 */
5502 ASSERT(lastx > 0);
5503 xfs_bmbt_get_all(ep - 1, &prev);
5504 ASSERT(prev.br_state == XFS_EXT_NORM);
5505 ASSERT(!ISNULLSTARTBLOCK(prev.br_startblock));
5506 ASSERT(del.br_startblock ==
5507 prev.br_startblock + prev.br_blockcount);
5508 if (prev.br_startoff < start) {
5509 mod = start - prev.br_startoff;
5510 prev.br_blockcount -= mod;
5511 prev.br_startblock += mod;
5512 prev.br_startoff = start;
5513 }
5514 prev.br_state = XFS_EXT_UNWRITTEN;
5515 error = xfs_bmap_add_extent(ip, lastx - 1, &cur,
5516 &prev, firstblock, flist, &logflags,
5517 XFS_DATA_FORK, 0);
5518 if (error)
5519 goto error0;
5520 goto nodelete;
5521 } else {
5522 ASSERT(del.br_state == XFS_EXT_NORM);
5523 del.br_state = XFS_EXT_UNWRITTEN;
5524 error = xfs_bmap_add_extent(ip, lastx, &cur,
5525 &del, firstblock, flist, &logflags,
5526 XFS_DATA_FORK, 0);
5527 if (error)
5528 goto error0;
5529 goto nodelete;
5530 }
5531 }
5532 if (wasdel) {
5533 ASSERT(STARTBLOCKVAL(del.br_startblock) > 0);
5534 /* Update realtime/data freespace, unreserve quota */
5535 if (isrt) {
5536 xfs_filblks_t rtexts;
5537
5538 rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
5539 do_div(rtexts, mp->m_sb.sb_rextsize);
5540 xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
5541 (int)rtexts, rsvd);
5542 (void)XFS_TRANS_RESERVE_QUOTA_NBLKS(mp,
5543 NULL, ip, -((long)del.br_blockcount), 0,
5544 XFS_QMOPT_RES_RTBLKS);
5545 } else {
5546 xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS,
5547 (int)del.br_blockcount, rsvd);
5548 (void)XFS_TRANS_RESERVE_QUOTA_NBLKS(mp,
5549 NULL, ip, -((long)del.br_blockcount), 0,
5550 XFS_QMOPT_RES_REGBLKS);
5551 }
5552 ip->i_delayed_blks -= del.br_blockcount;
5553 if (cur)
5554 cur->bc_private.b.flags |=
5555 XFS_BTCUR_BPRV_WASDEL;
5556 } else if (cur)
5557 cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
5558 /*
5559 * If it's the case where the directory code is running
5560 * with no block reservation, and the deleted block is in
5561 * the middle of its extent, and the resulting insert
5562 * of an extent would cause transformation to btree format,
5563 * then reject it. The calling code will then swap
5564 * blocks around instead.
5565 * We have to do this now, rather than waiting for the
5566 * conversion to btree format, since the transaction
5567 * will be dirty.
5568 */
5569 if (!wasdel && xfs_trans_get_block_res(tp) == 0 &&
5570 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5571 XFS_IFORK_NEXTENTS(ip, whichfork) >= ifp->if_ext_max &&
5572 del.br_startoff > got.br_startoff &&
5573 del.br_startoff + del.br_blockcount <
5574 got.br_startoff + got.br_blockcount) {
5575 error = XFS_ERROR(ENOSPC);
5576 goto error0;
5577 }
5578 error = xfs_bmap_del_extent(ip, tp, lastx, flist, cur, &del,
5579 &tmp_logflags, whichfork, rsvd);
5580 logflags |= tmp_logflags;
5581 if (error)
5582 goto error0;
5583 bno = del.br_startoff - 1;
5584 nodelete:
5585 lastx = ifp->if_lastex;
5586 /*
5587 * If not done go on to the next (previous) record.
5588 * Reset ep in case the extents array was re-alloced.
5589 */
5590 ep = &ifp->if_u1.if_extents[lastx];
5591 if (bno != (xfs_fileoff_t)-1 && bno >= start) {
5592 if (lastx >= XFS_IFORK_NEXTENTS(ip, whichfork) ||
5593 xfs_bmbt_get_startoff(ep) > bno) {
5594 lastx--;
5595 ep--;
5596 }
5597 if (lastx >= 0)
5598 xfs_bmbt_get_all(ep, &got);
5599 extno++;
5600 }
5601 }
5602 ifp->if_lastex = lastx;
5603 *done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0;
5604 ASSERT(ifp->if_ext_max ==
5605 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5606 /*
5607 * Convert to a btree if necessary.
5608 */
5609 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5610 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
5611 ASSERT(cur == NULL);
5612 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist,
5613 &cur, 0, &tmp_logflags, whichfork);
5614 logflags |= tmp_logflags;
5615 if (error)
5616 goto error0;
5617 }
5618 /*
5619 * transform from btree to extents, give it cur
5620 */
5621 else if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
5622 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
5623 ASSERT(cur != NULL);
5624 error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
5625 whichfork);
5626 logflags |= tmp_logflags;
5627 if (error)
5628 goto error0;
5629 }
5630 /*
5631 * transform from extents to local?
5632 */
5633 ASSERT(ifp->if_ext_max ==
5634 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5635 error = 0;
5636 error0:
5637 /*
5638 * Log everything. Do this after conversion, there's no point in
5639 * logging the extent list if we've converted to btree format.
5640 */
5641 if ((logflags & XFS_ILOG_FEXT(whichfork)) &&
5642 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5643 logflags &= ~XFS_ILOG_FEXT(whichfork);
5644 else if ((logflags & XFS_ILOG_FBROOT(whichfork)) &&
5645 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5646 logflags &= ~XFS_ILOG_FBROOT(whichfork);
5647 /*
5648 * Log inode even in the error case, if the transaction
5649 * is dirty we'll need to shut down the filesystem.
5650 */
5651 if (logflags)
5652 xfs_trans_log_inode(tp, ip, logflags);
5653 if (cur) {
5654 if (!error) {
5655 *firstblock = cur->bc_private.b.firstblock;
5656 cur->bc_private.b.allocated = 0;
5657 }
5658 xfs_btree_del_cursor(cur,
5659 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5660 }
5661 return error;
5662 }
5663
5664 /*
5665 * Fcntl interface to xfs_bmapi.
5666 */
5667 int /* error code */
5668 xfs_getbmap(
5669 bhv_desc_t *bdp, /* XFS behavior descriptor*/
5670 struct getbmap *bmv, /* user bmap structure */
5671 void __user *ap, /* pointer to user's array */
5672 int interface) /* interface flags */
5673 {
5674 __int64_t bmvend; /* last block requested */
5675 int error; /* return value */
5676 __int64_t fixlen; /* length for -1 case */
5677 int i; /* extent number */
5678 xfs_inode_t *ip; /* xfs incore inode pointer */
5679 vnode_t *vp; /* corresponding vnode */
5680 int lock; /* lock state */
5681 xfs_bmbt_irec_t *map; /* buffer for user's data */
5682 xfs_mount_t *mp; /* file system mount point */
5683 int nex; /* # of user extents can do */
5684 int nexleft; /* # of user extents left */
5685 int subnex; /* # of bmapi's can do */
5686 int nmap; /* number of map entries */
5687 struct getbmap out; /* output structure */
5688 int whichfork; /* data or attr fork */
5689 int prealloced; /* this is a file with
5690 * preallocated data space */
5691 int sh_unwritten; /* true, if unwritten */
5692 /* extents listed separately */
5693 int bmapi_flags; /* flags for xfs_bmapi */
5694 __int32_t oflags; /* getbmapx bmv_oflags field */
5695
5696 vp = BHV_TO_VNODE(bdp);
5697 ip = XFS_BHVTOI(bdp);
5698 mp = ip->i_mount;
5699
5700 whichfork = interface & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
5701 sh_unwritten = (interface & BMV_IF_PREALLOC) != 0;
5702
5703 /* If the BMV_IF_NO_DMAPI_READ interface bit specified, do not
5704 * generate a DMAPI read event. Otherwise, if the DM_EVENT_READ
5705 * bit is set for the file, generate a read event in order
5706 * that the DMAPI application may do its thing before we return
5707 * the extents. Usually this means restoring user file data to
5708 * regions of the file that look like holes.
5709 *
5710 * The "old behavior" (from XFS_IOC_GETBMAP) is to not specify
5711 * BMV_IF_NO_DMAPI_READ so that read events are generated.
5712 * If this were not true, callers of ioctl( XFS_IOC_GETBMAP )
5713 * could misinterpret holes in a DMAPI file as true holes,
5714 * when in fact they may represent offline user data.
5715 */
5716 if ( (interface & BMV_IF_NO_DMAPI_READ) == 0
5717 && DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ)
5718 && whichfork == XFS_DATA_FORK) {
5719
5720 error = XFS_SEND_DATA(mp, DM_EVENT_READ, vp, 0, 0, 0, NULL);
5721 if (error)
5722 return XFS_ERROR(error);
5723 }
5724
5725 if (whichfork == XFS_ATTR_FORK) {
5726 if (XFS_IFORK_Q(ip)) {
5727 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS &&
5728 ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE &&
5729 ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)
5730 return XFS_ERROR(EINVAL);
5731 } else if (unlikely(
5732 ip->i_d.di_aformat != 0 &&
5733 ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) {
5734 XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW,
5735 ip->i_mount);
5736 return XFS_ERROR(EFSCORRUPTED);
5737 }
5738 } else if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
5739 ip->i_d.di_format != XFS_DINODE_FMT_BTREE &&
5740 ip->i_d.di_format != XFS_DINODE_FMT_LOCAL)
5741 return XFS_ERROR(EINVAL);
5742 if (whichfork == XFS_DATA_FORK) {
5743 if ((ip->i_d.di_extsize && (ip->i_d.di_flags &
5744 (XFS_DIFLAG_REALTIME|XFS_DIFLAG_EXTSIZE))) ||
5745 ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){
5746 prealloced = 1;
5747 fixlen = XFS_MAXIOFFSET(mp);
5748 } else {
5749 prealloced = 0;
5750 fixlen = ip->i_d.di_size;
5751 }
5752 } else {
5753 prealloced = 0;
5754 fixlen = 1LL << 32;
5755 }
5756
5757 if (bmv->bmv_length == -1) {
5758 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen));
5759 bmv->bmv_length = MAX( (__int64_t)(fixlen - bmv->bmv_offset),
5760 (__int64_t)0);
5761 } else if (bmv->bmv_length < 0)
5762 return XFS_ERROR(EINVAL);
5763 if (bmv->bmv_length == 0) {
5764 bmv->bmv_entries = 0;
5765 return 0;
5766 }
5767 nex = bmv->bmv_count - 1;
5768 if (nex <= 0)
5769 return XFS_ERROR(EINVAL);
5770 bmvend = bmv->bmv_offset + bmv->bmv_length;
5771
5772 xfs_ilock(ip, XFS_IOLOCK_SHARED);
5773
5774 if (whichfork == XFS_DATA_FORK && ip->i_delayed_blks) {
5775 /* xfs_fsize_t last_byte = xfs_file_last_byte(ip); */
5776 VOP_FLUSH_PAGES(vp, (xfs_off_t)0, -1, 0, FI_REMAPF, error);
5777 }
5778
5779 ASSERT(whichfork == XFS_ATTR_FORK || ip->i_delayed_blks == 0);
5780
5781 lock = xfs_ilock_map_shared(ip);
5782
5783 /*
5784 * Don't let nex be bigger than the number of extents
5785 * we can have assuming alternating holes and real extents.
5786 */
5787 if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1)
5788 nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1;
5789
5790 bmapi_flags = XFS_BMAPI_AFLAG(whichfork) |
5791 ((sh_unwritten) ? 0 : XFS_BMAPI_IGSTATE);
5792
5793 /*
5794 * Allocate enough space to handle "subnex" maps at a time.
5795 */
5796 subnex = 16;
5797 map = kmem_alloc(subnex * sizeof(*map), KM_SLEEP);
5798
5799 bmv->bmv_entries = 0;
5800
5801 if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0) {
5802 error = 0;
5803 goto unlock_and_return;
5804 }
5805
5806 nexleft = nex;
5807
5808 do {
5809 nmap = (nexleft > subnex) ? subnex : nexleft;
5810 error = xfs_bmapi(NULL, ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
5811 XFS_BB_TO_FSB(mp, bmv->bmv_length),
5812 bmapi_flags, NULL, 0, map, &nmap, NULL);
5813 if (error)
5814 goto unlock_and_return;
5815 ASSERT(nmap <= subnex);
5816
5817 for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
5818 nexleft--;
5819 oflags = (map[i].br_state == XFS_EXT_UNWRITTEN) ?
5820 BMV_OF_PREALLOC : 0;
5821 out.bmv_offset = XFS_FSB_TO_BB(mp, map[i].br_startoff);
5822 out.bmv_length = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
5823 ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
5824 if (map[i].br_startblock == HOLESTARTBLOCK &&
5825 ((prealloced && out.bmv_offset + out.bmv_length == bmvend) ||
5826 whichfork == XFS_ATTR_FORK )) {
5827 /*
5828 * came to hole at end of file or the end of
5829 attribute fork
5830 */
5831 goto unlock_and_return;
5832 } else {
5833 out.bmv_block =
5834 (map[i].br_startblock == HOLESTARTBLOCK) ?
5835 -1 :
5836 XFS_FSB_TO_DB(ip, map[i].br_startblock);
5837
5838 /* return either getbmap/getbmapx structure. */
5839 if (interface & BMV_IF_EXTENDED) {
5840 struct getbmapx outx;
5841
5842 GETBMAP_CONVERT(out,outx);
5843 outx.bmv_oflags = oflags;
5844 outx.bmv_unused1 = outx.bmv_unused2 = 0;
5845 if (copy_to_user(ap, &outx,
5846 sizeof(outx))) {
5847 error = XFS_ERROR(EFAULT);
5848 goto unlock_and_return;
5849 }
5850 } else {
5851 if (copy_to_user(ap, &out,
5852 sizeof(out))) {
5853 error = XFS_ERROR(EFAULT);
5854 goto unlock_and_return;
5855 }
5856 }
5857 bmv->bmv_offset =
5858 out.bmv_offset + out.bmv_length;
5859 bmv->bmv_length = MAX((__int64_t)0,
5860 (__int64_t)(bmvend - bmv->bmv_offset));
5861 bmv->bmv_entries++;
5862 ap = (interface & BMV_IF_EXTENDED) ?
5863 (void __user *)
5864 ((struct getbmapx __user *)ap + 1) :
5865 (void __user *)
5866 ((struct getbmap __user *)ap + 1);
5867 }
5868 }
5869 } while (nmap && nexleft && bmv->bmv_length);
5870
5871 unlock_and_return:
5872 xfs_iunlock_map_shared(ip, lock);
5873 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
5874
5875 kmem_free(map, subnex * sizeof(*map));
5876
5877 return error;
5878 }
5879
5880 /*
5881 * Check the last inode extent to determine whether this allocation will result
5882 * in blocks being allocated at the end of the file. When we allocate new data
5883 * blocks at the end of the file which do not start at the previous data block,
5884 * we will try to align the new blocks at stripe unit boundaries.
5885 */
5886 STATIC int /* error */
5887 xfs_bmap_isaeof(
5888 xfs_inode_t *ip, /* incore inode pointer */
5889 xfs_fileoff_t off, /* file offset in fsblocks */
5890 int whichfork, /* data or attribute fork */
5891 char *aeof) /* return value */
5892 {
5893 int error; /* error return value */
5894 xfs_ifork_t *ifp; /* inode fork pointer */
5895 xfs_bmbt_rec_t *lastrec; /* extent list entry pointer */
5896 xfs_extnum_t nextents; /* size of extent list */
5897 xfs_bmbt_irec_t s; /* expanded extent list entry */
5898
5899 ASSERT(whichfork == XFS_DATA_FORK);
5900 ifp = XFS_IFORK_PTR(ip, whichfork);
5901 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5902 (error = xfs_iread_extents(NULL, ip, whichfork)))
5903 return error;
5904 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5905 if (nextents == 0) {
5906 *aeof = 1;
5907 return 0;
5908 }
5909 /*
5910 * Go to the last extent
5911 */
5912 lastrec = &ifp->if_u1.if_extents[nextents - 1];
5913 xfs_bmbt_get_all(lastrec, &s);
5914 /*
5915 * Check we are allocating in the last extent (for delayed allocations)
5916 * or past the last extent for non-delayed allocations.
5917 */
5918 *aeof = (off >= s.br_startoff &&
5919 off < s.br_startoff + s.br_blockcount &&
5920 ISNULLSTARTBLOCK(s.br_startblock)) ||
5921 off >= s.br_startoff + s.br_blockcount;
5922 return 0;
5923 }
5924
5925 /*
5926 * Check if the endoff is outside the last extent. If so the caller will grow
5927 * the allocation to a stripe unit boundary.
5928 */
5929 int /* error */
5930 xfs_bmap_eof(
5931 xfs_inode_t *ip, /* incore inode pointer */
5932 xfs_fileoff_t endoff, /* file offset in fsblocks */
5933 int whichfork, /* data or attribute fork */
5934 int *eof) /* result value */
5935 {
5936 xfs_fsblock_t blockcount; /* extent block count */
5937 int error; /* error return value */
5938 xfs_ifork_t *ifp; /* inode fork pointer */
5939 xfs_bmbt_rec_t *lastrec; /* extent list entry pointer */
5940 xfs_extnum_t nextents; /* size of extent list */
5941 xfs_fileoff_t startoff; /* extent starting file offset */
5942
5943 ASSERT(whichfork == XFS_DATA_FORK);
5944 ifp = XFS_IFORK_PTR(ip, whichfork);
5945 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5946 (error = xfs_iread_extents(NULL, ip, whichfork)))
5947 return error;
5948 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5949 if (nextents == 0) {
5950 *eof = 1;
5951 return 0;
5952 }
5953 /*
5954 * Go to the last extent
5955 */
5956 lastrec = &ifp->if_u1.if_extents[nextents - 1];
5957 startoff = xfs_bmbt_get_startoff(lastrec);
5958 blockcount = xfs_bmbt_get_blockcount(lastrec);
5959 *eof = endoff >= startoff + blockcount;
5960 return 0;
5961 }
5962
5963 #ifdef DEBUG
5964 /*
5965 * Check that the extents list for the inode ip is in the right order.
5966 */
5967 STATIC void
5968 xfs_bmap_check_extents(
5969 xfs_inode_t *ip, /* incore inode pointer */
5970 int whichfork) /* data or attr fork */
5971 {
5972 xfs_bmbt_rec_t *base; /* base of extents list */
5973 xfs_bmbt_rec_t *ep; /* current extent entry */
5974 xfs_ifork_t *ifp; /* inode fork pointer */
5975 xfs_extnum_t nextents; /* number of extents in list */
5976
5977 ifp = XFS_IFORK_PTR(ip, whichfork);
5978 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
5979 base = ifp->if_u1.if_extents;
5980 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5981 for (ep = base; ep < &base[nextents - 1]; ep++) {
5982 xfs_btree_check_rec(XFS_BTNUM_BMAP, (void *)ep,
5983 (void *)(ep + 1));
5984 }
5985 }
5986
5987 STATIC
5988 xfs_buf_t *
5989 xfs_bmap_get_bp(
5990 xfs_btree_cur_t *cur,
5991 xfs_fsblock_t bno)
5992 {
5993 int i;
5994 xfs_buf_t *bp;
5995
5996 if (!cur)
5997 return(NULL);
5998
5999 bp = NULL;
6000 for(i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
6001 bp = cur->bc_bufs[i];
6002 if (!bp) break;
6003 if (XFS_BUF_ADDR(bp) == bno)
6004 break; /* Found it */
6005 }
6006 if (i == XFS_BTREE_MAXLEVELS)
6007 bp = NULL;
6008
6009 if (!bp) { /* Chase down all the log items to see if the bp is there */
6010 xfs_log_item_chunk_t *licp;
6011 xfs_trans_t *tp;
6012
6013 tp = cur->bc_tp;
6014 licp = &tp->t_items;
6015 while (!bp && licp != NULL) {
6016 if (XFS_LIC_ARE_ALL_FREE(licp)) {
6017 licp = licp->lic_next;
6018 continue;
6019 }
6020 for (i = 0; i < licp->lic_unused; i++) {
6021 xfs_log_item_desc_t *lidp;
6022 xfs_log_item_t *lip;
6023 xfs_buf_log_item_t *bip;
6024 xfs_buf_t *lbp;
6025
6026 if (XFS_LIC_ISFREE(licp, i)) {
6027 continue;
6028 }
6029
6030 lidp = XFS_LIC_SLOT(licp, i);
6031 lip = lidp->lid_item;
6032 if (lip->li_type != XFS_LI_BUF)
6033 continue;
6034
6035 bip = (xfs_buf_log_item_t *)lip;
6036 lbp = bip->bli_buf;
6037
6038 if (XFS_BUF_ADDR(lbp) == bno) {
6039 bp = lbp;
6040 break; /* Found it */
6041 }
6042 }
6043 licp = licp->lic_next;
6044 }
6045 }
6046 return(bp);
6047 }
6048
6049 void
6050 xfs_check_block(
6051 xfs_bmbt_block_t *block,
6052 xfs_mount_t *mp,
6053 int root,
6054 short sz)
6055 {
6056 int i, j, dmxr;
6057 xfs_bmbt_ptr_t *pp, *thispa; /* pointer to block address */
6058 xfs_bmbt_key_t *prevp, *keyp;
6059
6060 ASSERT(be16_to_cpu(block->bb_level) > 0);
6061
6062 prevp = NULL;
6063 for( i = 1; i <= be16_to_cpu(block->bb_numrecs); i++) {
6064 dmxr = mp->m_bmap_dmxr[0];
6065
6066 if (root) {
6067 keyp = XFS_BMAP_BROOT_KEY_ADDR(block, i, sz);
6068 } else {
6069 keyp = XFS_BTREE_KEY_ADDR(mp->m_sb.sb_blocksize,
6070 xfs_bmbt, block, i, dmxr);
6071 }
6072
6073 if (prevp) {
6074 xfs_btree_check_key(XFS_BTNUM_BMAP, prevp, keyp);
6075 }
6076 prevp = keyp;
6077
6078 /*
6079 * Compare the block numbers to see if there are dups.
6080 */
6081
6082 if (root) {
6083 pp = XFS_BMAP_BROOT_PTR_ADDR(block, i, sz);
6084 } else {
6085 pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize,
6086 xfs_bmbt, block, i, dmxr);
6087 }
6088 for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
6089 if (root) {
6090 thispa = XFS_BMAP_BROOT_PTR_ADDR(block, j, sz);
6091 } else {
6092 thispa = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize,
6093 xfs_bmbt, block, j, dmxr);
6094 }
6095 if (INT_GET(*thispa, ARCH_CONVERT) ==
6096 INT_GET(*pp, ARCH_CONVERT)) {
6097 cmn_err(CE_WARN, "%s: thispa(%d) == pp(%d) %Ld",
6098 __FUNCTION__, j, i,
6099 INT_GET(*thispa, ARCH_CONVERT));
6100 panic("%s: ptrs are equal in node\n",
6101 __FUNCTION__);
6102 }
6103 }
6104 }
6105 }
6106
6107 /*
6108 * Check that the extents for the inode ip are in the right order in all
6109 * btree leaves.
6110 */
6111
6112 STATIC void
6113 xfs_bmap_check_leaf_extents(
6114 xfs_btree_cur_t *cur, /* btree cursor or null */
6115 xfs_inode_t *ip, /* incore inode pointer */
6116 int whichfork) /* data or attr fork */
6117 {
6118 xfs_bmbt_block_t *block; /* current btree block */
6119 xfs_fsblock_t bno; /* block # of "block" */
6120 xfs_buf_t *bp; /* buffer for "block" */
6121 int error; /* error return value */
6122 xfs_extnum_t i=0; /* index into the extents list */
6123 xfs_ifork_t *ifp; /* fork structure */
6124 int level; /* btree level, for checking */
6125 xfs_mount_t *mp; /* file system mount structure */
6126 xfs_bmbt_ptr_t *pp; /* pointer to block address */
6127 xfs_bmbt_rec_t *ep, *lastp; /* extent pointers in block entry */
6128 int bp_release = 0;
6129
6130 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
6131 return;
6132 }
6133
6134 bno = NULLFSBLOCK;
6135 mp = ip->i_mount;
6136 ifp = XFS_IFORK_PTR(ip, whichfork);
6137 block = ifp->if_broot;
6138 /*
6139 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
6140 */
6141 level = be16_to_cpu(block->bb_level);
6142 ASSERT(level > 0);
6143 xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
6144 pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
6145 ASSERT(INT_GET(*pp, ARCH_CONVERT) != NULLDFSBNO);
6146 ASSERT(XFS_FSB_TO_AGNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agcount);
6147 ASSERT(XFS_FSB_TO_AGBNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agblocks);
6148 bno = INT_GET(*pp, ARCH_CONVERT);
6149 /*
6150 * Go down the tree until leaf level is reached, following the first
6151 * pointer (leftmost) at each level.
6152 */
6153 while (level-- > 0) {
6154 /* See if buf is in cur first */
6155 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
6156 if (bp) {
6157 bp_release = 0;
6158 } else {
6159 bp_release = 1;
6160 }
6161 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
6162 XFS_BMAP_BTREE_REF)))
6163 goto error_norelse;
6164 block = XFS_BUF_TO_BMBT_BLOCK(bp);
6165 XFS_WANT_CORRUPTED_GOTO(
6166 XFS_BMAP_SANITY_CHECK(mp, block, level),
6167 error0);
6168 if (level == 0)
6169 break;
6170
6171 /*
6172 * Check this block for basic sanity (increasing keys and
6173 * no duplicate blocks).
6174 */
6175
6176 xfs_check_block(block, mp, 0, 0);
6177 pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt, block,
6178 1, mp->m_bmap_dmxr[1]);
6179 XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, INT_GET(*pp, ARCH_CONVERT)), error0);
6180 bno = INT_GET(*pp, ARCH_CONVERT);
6181 if (bp_release) {
6182 bp_release = 0;
6183 xfs_trans_brelse(NULL, bp);
6184 }
6185 }
6186
6187 /*
6188 * Here with bp and block set to the leftmost leaf node in the tree.
6189 */
6190 i = 0;
6191
6192 /*
6193 * Loop over all leaf nodes checking that all extents are in the right order.
6194 */
6195 lastp = NULL;
6196 for (;;) {
6197 xfs_bmbt_rec_t *frp;
6198 xfs_fsblock_t nextbno;
6199 xfs_extnum_t num_recs;
6200
6201
6202 num_recs = be16_to_cpu(block->bb_numrecs);
6203
6204 /*
6205 * Read-ahead the next leaf block, if any.
6206 */
6207
6208 nextbno = be64_to_cpu(block->bb_rightsib);
6209
6210 /*
6211 * Check all the extents to make sure they are OK.
6212 * If we had a previous block, the last entry should
6213 * conform with the first entry in this one.
6214 */
6215
6216 frp = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt,
6217 block, 1, mp->m_bmap_dmxr[0]);
6218
6219 for (ep = frp;ep < frp + (num_recs - 1); ep++) {
6220 if (lastp) {
6221 xfs_btree_check_rec(XFS_BTNUM_BMAP,
6222 (void *)lastp, (void *)ep);
6223 }
6224 xfs_btree_check_rec(XFS_BTNUM_BMAP, (void *)ep,
6225 (void *)(ep + 1));
6226 }
6227 lastp = frp + num_recs - 1; /* For the next iteration */
6228
6229 i += num_recs;
6230 if (bp_release) {
6231 bp_release = 0;
6232 xfs_trans_brelse(NULL, bp);
6233 }
6234 bno = nextbno;
6235 /*
6236 * If we've reached the end, stop.
6237 */
6238 if (bno == NULLFSBLOCK)
6239 break;
6240
6241 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
6242 if (bp) {
6243 bp_release = 0;
6244 } else {
6245 bp_release = 1;
6246 }
6247 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
6248 XFS_BMAP_BTREE_REF)))
6249 goto error_norelse;
6250 block = XFS_BUF_TO_BMBT_BLOCK(bp);
6251 }
6252 if (bp_release) {
6253 bp_release = 0;
6254 xfs_trans_brelse(NULL, bp);
6255 }
6256 return;
6257
6258 error0:
6259 cmn_err(CE_WARN, "%s: at error0", __FUNCTION__);
6260 if (bp_release)
6261 xfs_trans_brelse(NULL, bp);
6262 error_norelse:
6263 cmn_err(CE_WARN, "%s: BAD after btree leaves for %d extents",
6264 __FUNCTION__, i);
6265 panic("%s: CORRUPTED BTREE OR SOMETHING", __FUNCTION__);
6266 return;
6267 }
6268 #endif
6269
6270 /*
6271 * Count fsblocks of the given fork.
6272 */
6273 int /* error */
6274 xfs_bmap_count_blocks(
6275 xfs_trans_t *tp, /* transaction pointer */
6276 xfs_inode_t *ip, /* incore inode */
6277 int whichfork, /* data or attr fork */
6278 int *count) /* out: count of blocks */
6279 {
6280 xfs_bmbt_block_t *block; /* current btree block */
6281 xfs_fsblock_t bno; /* block # of "block" */
6282 xfs_ifork_t *ifp; /* fork structure */
6283 int level; /* btree level, for checking */
6284 xfs_mount_t *mp; /* file system mount structure */
6285 xfs_bmbt_ptr_t *pp; /* pointer to block address */
6286
6287 bno = NULLFSBLOCK;
6288 mp = ip->i_mount;
6289 ifp = XFS_IFORK_PTR(ip, whichfork);
6290 if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) {
6291 if (unlikely(xfs_bmap_count_leaves(ifp->if_u1.if_extents,
6292 ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t),
6293 count) < 0)) {
6294 XFS_ERROR_REPORT("xfs_bmap_count_blocks(1)",
6295 XFS_ERRLEVEL_LOW, mp);
6296 return XFS_ERROR(EFSCORRUPTED);
6297 }
6298 return 0;
6299 }
6300
6301 /*
6302 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
6303 */
6304 block = ifp->if_broot;
6305 level = be16_to_cpu(block->bb_level);
6306 ASSERT(level > 0);
6307 pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
6308 ASSERT(INT_GET(*pp, ARCH_CONVERT) != NULLDFSBNO);
6309 ASSERT(XFS_FSB_TO_AGNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agcount);
6310 ASSERT(XFS_FSB_TO_AGBNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agblocks);
6311 bno = INT_GET(*pp, ARCH_CONVERT);
6312
6313 if (unlikely(xfs_bmap_count_tree(mp, tp, bno, level, count) < 0)) {
6314 XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW,
6315 mp);
6316 return XFS_ERROR(EFSCORRUPTED);
6317 }
6318
6319 return 0;
6320 }
6321
6322 /*
6323 * Recursively walks each level of a btree
6324 * to count total fsblocks is use.
6325 */
6326 int /* error */
6327 xfs_bmap_count_tree(
6328 xfs_mount_t *mp, /* file system mount point */
6329 xfs_trans_t *tp, /* transaction pointer */
6330 xfs_fsblock_t blockno, /* file system block number */
6331 int levelin, /* level in btree */
6332 int *count) /* Count of blocks */
6333 {
6334 int error;
6335 xfs_buf_t *bp, *nbp;
6336 int level = levelin;
6337 xfs_bmbt_ptr_t *pp;
6338 xfs_fsblock_t bno = blockno;
6339 xfs_fsblock_t nextbno;
6340 xfs_bmbt_block_t *block, *nextblock;
6341 int numrecs;
6342 xfs_bmbt_rec_t *frp;
6343
6344 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF)))
6345 return error;
6346 *count += 1;
6347 block = XFS_BUF_TO_BMBT_BLOCK(bp);
6348
6349 if (--level) {
6350 /* Not at node above leafs, count this level of nodes */
6351 nextbno = be64_to_cpu(block->bb_rightsib);
6352 while (nextbno != NULLFSBLOCK) {
6353 if ((error = xfs_btree_read_bufl(mp, tp, nextbno,
6354 0, &nbp, XFS_BMAP_BTREE_REF)))
6355 return error;
6356 *count += 1;
6357 nextblock = XFS_BUF_TO_BMBT_BLOCK(nbp);
6358 nextbno = be64_to_cpu(nextblock->bb_rightsib);
6359 xfs_trans_brelse(tp, nbp);
6360 }
6361
6362 /* Dive to the next level */
6363 pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize,
6364 xfs_bmbt, block, 1, mp->m_bmap_dmxr[1]);
6365 bno = INT_GET(*pp, ARCH_CONVERT);
6366 if (unlikely((error =
6367 xfs_bmap_count_tree(mp, tp, bno, level, count)) < 0)) {
6368 xfs_trans_brelse(tp, bp);
6369 XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
6370 XFS_ERRLEVEL_LOW, mp);
6371 return XFS_ERROR(EFSCORRUPTED);
6372 }
6373 xfs_trans_brelse(tp, bp);
6374 } else {
6375 /* count all level 1 nodes and their leaves */
6376 for (;;) {
6377 nextbno = be64_to_cpu(block->bb_rightsib);
6378 numrecs = be16_to_cpu(block->bb_numrecs);
6379 frp = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize,
6380 xfs_bmbt, block, 1, mp->m_bmap_dmxr[0]);
6381 if (unlikely(xfs_bmap_disk_count_leaves(frp, numrecs, count) < 0)) {
6382 xfs_trans_brelse(tp, bp);
6383 XFS_ERROR_REPORT("xfs_bmap_count_tree(2)",
6384 XFS_ERRLEVEL_LOW, mp);
6385 return XFS_ERROR(EFSCORRUPTED);
6386 }
6387 xfs_trans_brelse(tp, bp);
6388 if (nextbno == NULLFSBLOCK)
6389 break;
6390 bno = nextbno;
6391 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
6392 XFS_BMAP_BTREE_REF)))
6393 return error;
6394 *count += 1;
6395 block = XFS_BUF_TO_BMBT_BLOCK(bp);
6396 }
6397 }
6398 return 0;
6399 }
6400
6401 /*
6402 * Count leaf blocks given a pointer to an extent list.
6403 */
6404 int
6405 xfs_bmap_count_leaves(
6406 xfs_bmbt_rec_t *frp,
6407 int numrecs,
6408 int *count)
6409 {
6410 int b;
6411
6412 for ( b = 1; b <= numrecs; b++, frp++)
6413 *count += xfs_bmbt_get_blockcount(frp);
6414 return 0;
6415 }
6416
6417 /*
6418 * Count leaf blocks given a pointer to an extent list originally in btree format.
6419 */
6420 int
6421 xfs_bmap_disk_count_leaves(
6422 xfs_bmbt_rec_t *frp,
6423 int numrecs,
6424 int *count)
6425 {
6426 int b;
6427
6428 for ( b = 1; b <= numrecs; b++, frp++)
6429 *count += xfs_bmbt_disk_get_blockcount(frp);
6430 return 0;
6431 }
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