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[deliverable/linux.git] / fs / xfs / xfs_bmap.c
1 /*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_inum.h"
24 #include "xfs_trans.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_dir2.h"
28 #include "xfs_da_btree.h"
29 #include "xfs_bmap_btree.h"
30 #include "xfs_alloc_btree.h"
31 #include "xfs_ialloc_btree.h"
32 #include "xfs_dinode.h"
33 #include "xfs_inode.h"
34 #include "xfs_btree.h"
35 #include "xfs_mount.h"
36 #include "xfs_itable.h"
37 #include "xfs_inode_item.h"
38 #include "xfs_extfree_item.h"
39 #include "xfs_alloc.h"
40 #include "xfs_bmap.h"
41 #include "xfs_rtalloc.h"
42 #include "xfs_error.h"
43 #include "xfs_attr_leaf.h"
44 #include "xfs_rw.h"
45 #include "xfs_quota.h"
46 #include "xfs_trans_space.h"
47 #include "xfs_buf_item.h"
48 #include "xfs_filestream.h"
49 #include "xfs_vnodeops.h"
50 #include "xfs_trace.h"
51
52
53 #ifdef DEBUG
54 STATIC void
55 xfs_bmap_check_leaf_extents(xfs_btree_cur_t *cur, xfs_inode_t *ip, int whichfork);
56 #endif
57
58 kmem_zone_t *xfs_bmap_free_item_zone;
59
60 /*
61 * Prototypes for internal bmap routines.
62 */
63
64
65 /*
66 * Called from xfs_bmap_add_attrfork to handle extents format files.
67 */
68 STATIC int /* error */
69 xfs_bmap_add_attrfork_extents(
70 xfs_trans_t *tp, /* transaction pointer */
71 xfs_inode_t *ip, /* incore inode pointer */
72 xfs_fsblock_t *firstblock, /* first block allocated */
73 xfs_bmap_free_t *flist, /* blocks to free at commit */
74 int *flags); /* inode logging flags */
75
76 /*
77 * Called from xfs_bmap_add_attrfork to handle local format files.
78 */
79 STATIC int /* error */
80 xfs_bmap_add_attrfork_local(
81 xfs_trans_t *tp, /* transaction pointer */
82 xfs_inode_t *ip, /* incore inode pointer */
83 xfs_fsblock_t *firstblock, /* first block allocated */
84 xfs_bmap_free_t *flist, /* blocks to free at commit */
85 int *flags); /* inode logging flags */
86
87 /*
88 * Called by xfs_bmap_add_extent to handle cases converting a delayed
89 * allocation to a real allocation.
90 */
91 STATIC int /* error */
92 xfs_bmap_add_extent_delay_real(
93 struct xfs_trans *tp, /* transaction pointer */
94 xfs_inode_t *ip, /* incore inode pointer */
95 xfs_extnum_t *idx, /* extent number to update/insert */
96 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
97 xfs_bmbt_irec_t *new, /* new data to add to file extents */
98 xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
99 xfs_fsblock_t *first, /* pointer to firstblock variable */
100 xfs_bmap_free_t *flist, /* list of extents to be freed */
101 int *logflagsp); /* inode logging flags */
102
103 /*
104 * Called by xfs_bmap_add_extent to handle cases converting a hole
105 * to a delayed allocation.
106 */
107 STATIC int /* error */
108 xfs_bmap_add_extent_hole_delay(
109 xfs_inode_t *ip, /* incore inode pointer */
110 xfs_extnum_t *idx, /* extent number to update/insert */
111 xfs_bmbt_irec_t *new, /* new data to add to file extents */
112 int *logflagsp); /* inode logging flags */
113
114 /*
115 * Called by xfs_bmap_add_extent to handle cases converting a hole
116 * to a real allocation.
117 */
118 STATIC int /* error */
119 xfs_bmap_add_extent_hole_real(
120 xfs_inode_t *ip, /* incore inode pointer */
121 xfs_extnum_t *idx, /* extent number to update/insert */
122 xfs_btree_cur_t *cur, /* if null, not a btree */
123 xfs_bmbt_irec_t *new, /* new data to add to file extents */
124 int *logflagsp, /* inode logging flags */
125 int whichfork); /* data or attr fork */
126
127 /*
128 * Called by xfs_bmap_add_extent to handle cases converting an unwritten
129 * allocation to a real allocation or vice versa.
130 */
131 STATIC int /* error */
132 xfs_bmap_add_extent_unwritten_real(
133 xfs_inode_t *ip, /* incore inode pointer */
134 xfs_extnum_t *idx, /* extent number to update/insert */
135 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
136 xfs_bmbt_irec_t *new, /* new data to add to file extents */
137 int *logflagsp); /* inode logging flags */
138
139 /*
140 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
141 * It figures out where to ask the underlying allocator to put the new extent.
142 */
143 STATIC int /* error */
144 xfs_bmap_alloc(
145 xfs_bmalloca_t *ap); /* bmap alloc argument struct */
146
147 /*
148 * Transform a btree format file with only one leaf node, where the
149 * extents list will fit in the inode, into an extents format file.
150 * Since the file extents are already in-core, all we have to do is
151 * give up the space for the btree root and pitch the leaf block.
152 */
153 STATIC int /* error */
154 xfs_bmap_btree_to_extents(
155 xfs_trans_t *tp, /* transaction pointer */
156 xfs_inode_t *ip, /* incore inode pointer */
157 xfs_btree_cur_t *cur, /* btree cursor */
158 int *logflagsp, /* inode logging flags */
159 int whichfork); /* data or attr fork */
160
161 /*
162 * Remove the entry "free" from the free item list. Prev points to the
163 * previous entry, unless "free" is the head of the list.
164 */
165 STATIC void
166 xfs_bmap_del_free(
167 xfs_bmap_free_t *flist, /* free item list header */
168 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
169 xfs_bmap_free_item_t *free); /* list item to be freed */
170
171 /*
172 * Convert an extents-format file into a btree-format file.
173 * The new file will have a root block (in the inode) and a single child block.
174 */
175 STATIC int /* error */
176 xfs_bmap_extents_to_btree(
177 xfs_trans_t *tp, /* transaction pointer */
178 xfs_inode_t *ip, /* incore inode pointer */
179 xfs_fsblock_t *firstblock, /* first-block-allocated */
180 xfs_bmap_free_t *flist, /* blocks freed in xaction */
181 xfs_btree_cur_t **curp, /* cursor returned to caller */
182 int wasdel, /* converting a delayed alloc */
183 int *logflagsp, /* inode logging flags */
184 int whichfork); /* data or attr fork */
185
186 /*
187 * Convert a local file to an extents file.
188 * This code is sort of bogus, since the file data needs to get
189 * logged so it won't be lost. The bmap-level manipulations are ok, though.
190 */
191 STATIC int /* error */
192 xfs_bmap_local_to_extents(
193 xfs_trans_t *tp, /* transaction pointer */
194 xfs_inode_t *ip, /* incore inode pointer */
195 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
196 xfs_extlen_t total, /* total blocks needed by transaction */
197 int *logflagsp, /* inode logging flags */
198 int whichfork); /* data or attr fork */
199
200 /*
201 * Search the extents list for the inode, for the extent containing bno.
202 * If bno lies in a hole, point to the next entry. If bno lies past eof,
203 * *eofp will be set, and *prevp will contain the last entry (null if none).
204 * Else, *lastxp will be set to the index of the found
205 * entry; *gotp will contain the entry.
206 */
207 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
208 xfs_bmap_search_extents(
209 xfs_inode_t *ip, /* incore inode pointer */
210 xfs_fileoff_t bno, /* block number searched for */
211 int whichfork, /* data or attr fork */
212 int *eofp, /* out: end of file found */
213 xfs_extnum_t *lastxp, /* out: last extent index */
214 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
215 xfs_bmbt_irec_t *prevp); /* out: previous extent entry found */
216
217 /*
218 * Check the last inode extent to determine whether this allocation will result
219 * in blocks being allocated at the end of the file. When we allocate new data
220 * blocks at the end of the file which do not start at the previous data block,
221 * we will try to align the new blocks at stripe unit boundaries.
222 */
223 STATIC int /* error */
224 xfs_bmap_isaeof(
225 xfs_inode_t *ip, /* incore inode pointer */
226 xfs_fileoff_t off, /* file offset in fsblocks */
227 int whichfork, /* data or attribute fork */
228 char *aeof); /* return value */
229
230 /*
231 * Compute the worst-case number of indirect blocks that will be used
232 * for ip's delayed extent of length "len".
233 */
234 STATIC xfs_filblks_t
235 xfs_bmap_worst_indlen(
236 xfs_inode_t *ip, /* incore inode pointer */
237 xfs_filblks_t len); /* delayed extent length */
238
239 #ifdef DEBUG
240 /*
241 * Perform various validation checks on the values being returned
242 * from xfs_bmapi().
243 */
244 STATIC void
245 xfs_bmap_validate_ret(
246 xfs_fileoff_t bno,
247 xfs_filblks_t len,
248 int flags,
249 xfs_bmbt_irec_t *mval,
250 int nmap,
251 int ret_nmap);
252 #else
253 #define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
254 #endif /* DEBUG */
255
256 STATIC int
257 xfs_bmap_count_tree(
258 xfs_mount_t *mp,
259 xfs_trans_t *tp,
260 xfs_ifork_t *ifp,
261 xfs_fsblock_t blockno,
262 int levelin,
263 int *count);
264
265 STATIC void
266 xfs_bmap_count_leaves(
267 xfs_ifork_t *ifp,
268 xfs_extnum_t idx,
269 int numrecs,
270 int *count);
271
272 STATIC void
273 xfs_bmap_disk_count_leaves(
274 struct xfs_mount *mp,
275 struct xfs_btree_block *block,
276 int numrecs,
277 int *count);
278
279 /*
280 * Bmap internal routines.
281 */
282
283 STATIC int /* error */
284 xfs_bmbt_lookup_eq(
285 struct xfs_btree_cur *cur,
286 xfs_fileoff_t off,
287 xfs_fsblock_t bno,
288 xfs_filblks_t len,
289 int *stat) /* success/failure */
290 {
291 cur->bc_rec.b.br_startoff = off;
292 cur->bc_rec.b.br_startblock = bno;
293 cur->bc_rec.b.br_blockcount = len;
294 return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
295 }
296
297 STATIC int /* error */
298 xfs_bmbt_lookup_ge(
299 struct xfs_btree_cur *cur,
300 xfs_fileoff_t off,
301 xfs_fsblock_t bno,
302 xfs_filblks_t len,
303 int *stat) /* success/failure */
304 {
305 cur->bc_rec.b.br_startoff = off;
306 cur->bc_rec.b.br_startblock = bno;
307 cur->bc_rec.b.br_blockcount = len;
308 return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
309 }
310
311 /*
312 * Update the record referred to by cur to the value given
313 * by [off, bno, len, state].
314 * This either works (return 0) or gets an EFSCORRUPTED error.
315 */
316 STATIC int
317 xfs_bmbt_update(
318 struct xfs_btree_cur *cur,
319 xfs_fileoff_t off,
320 xfs_fsblock_t bno,
321 xfs_filblks_t len,
322 xfs_exntst_t state)
323 {
324 union xfs_btree_rec rec;
325
326 xfs_bmbt_disk_set_allf(&rec.bmbt, off, bno, len, state);
327 return xfs_btree_update(cur, &rec);
328 }
329
330 /*
331 * Called from xfs_bmap_add_attrfork to handle btree format files.
332 */
333 STATIC int /* error */
334 xfs_bmap_add_attrfork_btree(
335 xfs_trans_t *tp, /* transaction pointer */
336 xfs_inode_t *ip, /* incore inode pointer */
337 xfs_fsblock_t *firstblock, /* first block allocated */
338 xfs_bmap_free_t *flist, /* blocks to free at commit */
339 int *flags) /* inode logging flags */
340 {
341 xfs_btree_cur_t *cur; /* btree cursor */
342 int error; /* error return value */
343 xfs_mount_t *mp; /* file system mount struct */
344 int stat; /* newroot status */
345
346 mp = ip->i_mount;
347 if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
348 *flags |= XFS_ILOG_DBROOT;
349 else {
350 cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
351 cur->bc_private.b.flist = flist;
352 cur->bc_private.b.firstblock = *firstblock;
353 if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
354 goto error0;
355 /* must be at least one entry */
356 XFS_WANT_CORRUPTED_GOTO(stat == 1, error0);
357 if ((error = xfs_btree_new_iroot(cur, flags, &stat)))
358 goto error0;
359 if (stat == 0) {
360 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
361 return XFS_ERROR(ENOSPC);
362 }
363 *firstblock = cur->bc_private.b.firstblock;
364 cur->bc_private.b.allocated = 0;
365 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
366 }
367 return 0;
368 error0:
369 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
370 return error;
371 }
372
373 /*
374 * Called from xfs_bmap_add_attrfork to handle extents format files.
375 */
376 STATIC int /* error */
377 xfs_bmap_add_attrfork_extents(
378 xfs_trans_t *tp, /* transaction pointer */
379 xfs_inode_t *ip, /* incore inode pointer */
380 xfs_fsblock_t *firstblock, /* first block allocated */
381 xfs_bmap_free_t *flist, /* blocks to free at commit */
382 int *flags) /* inode logging flags */
383 {
384 xfs_btree_cur_t *cur; /* bmap btree cursor */
385 int error; /* error return value */
386
387 if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
388 return 0;
389 cur = NULL;
390 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist, &cur, 0,
391 flags, XFS_DATA_FORK);
392 if (cur) {
393 cur->bc_private.b.allocated = 0;
394 xfs_btree_del_cursor(cur,
395 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
396 }
397 return error;
398 }
399
400 /*
401 * Called from xfs_bmap_add_attrfork to handle local format files.
402 */
403 STATIC int /* error */
404 xfs_bmap_add_attrfork_local(
405 xfs_trans_t *tp, /* transaction pointer */
406 xfs_inode_t *ip, /* incore inode pointer */
407 xfs_fsblock_t *firstblock, /* first block allocated */
408 xfs_bmap_free_t *flist, /* blocks to free at commit */
409 int *flags) /* inode logging flags */
410 {
411 xfs_da_args_t dargs; /* args for dir/attr code */
412 int error; /* error return value */
413 xfs_mount_t *mp; /* mount structure pointer */
414
415 if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
416 return 0;
417 if (S_ISDIR(ip->i_d.di_mode)) {
418 mp = ip->i_mount;
419 memset(&dargs, 0, sizeof(dargs));
420 dargs.dp = ip;
421 dargs.firstblock = firstblock;
422 dargs.flist = flist;
423 dargs.total = mp->m_dirblkfsbs;
424 dargs.whichfork = XFS_DATA_FORK;
425 dargs.trans = tp;
426 error = xfs_dir2_sf_to_block(&dargs);
427 } else
428 error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
429 XFS_DATA_FORK);
430 return error;
431 }
432
433 /*
434 * Called by xfs_bmapi to update file extent records and the btree
435 * after allocating space (or doing a delayed allocation).
436 */
437 STATIC int /* error */
438 xfs_bmap_add_extent(
439 struct xfs_trans *tp, /* transaction pointer */
440 xfs_inode_t *ip, /* incore inode pointer */
441 xfs_extnum_t *idx, /* extent number to update/insert */
442 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
443 xfs_bmbt_irec_t *new, /* new data to add to file extents */
444 xfs_fsblock_t *first, /* pointer to firstblock variable */
445 xfs_bmap_free_t *flist, /* list of extents to be freed */
446 int *logflagsp, /* inode logging flags */
447 int whichfork) /* data or attr fork */
448 {
449 xfs_btree_cur_t *cur; /* btree cursor or null */
450 xfs_filblks_t da_new; /* new count del alloc blocks used */
451 xfs_filblks_t da_old; /* old count del alloc blocks used */
452 int error; /* error return value */
453 xfs_ifork_t *ifp; /* inode fork ptr */
454 int logflags; /* returned value */
455 xfs_extnum_t nextents; /* number of extents in file now */
456
457 XFS_STATS_INC(xs_add_exlist);
458
459 cur = *curp;
460 ifp = XFS_IFORK_PTR(ip, whichfork);
461 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
462 da_old = da_new = 0;
463 error = 0;
464
465 ASSERT(*idx >= 0);
466 ASSERT(*idx <= nextents);
467
468 /*
469 * This is the first extent added to a new/empty file.
470 * Special case this one, so other routines get to assume there are
471 * already extents in the list.
472 */
473 if (nextents == 0) {
474 xfs_iext_insert(ip, *idx, 1, new,
475 whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0);
476
477 ASSERT(cur == NULL);
478
479 if (!isnullstartblock(new->br_startblock)) {
480 XFS_IFORK_NEXT_SET(ip, whichfork, 1);
481 logflags = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
482 } else
483 logflags = 0;
484 }
485 /*
486 * Any kind of new delayed allocation goes here.
487 */
488 else if (isnullstartblock(new->br_startblock)) {
489 if (cur)
490 ASSERT((cur->bc_private.b.flags &
491 XFS_BTCUR_BPRV_WASDEL) == 0);
492 error = xfs_bmap_add_extent_hole_delay(ip, idx, new,
493 &logflags);
494 }
495 /*
496 * Real allocation off the end of the file.
497 */
498 else if (*idx == nextents) {
499 if (cur)
500 ASSERT((cur->bc_private.b.flags &
501 XFS_BTCUR_BPRV_WASDEL) == 0);
502 error = xfs_bmap_add_extent_hole_real(ip, idx, cur, new,
503 &logflags, whichfork);
504 } else {
505 xfs_bmbt_irec_t prev; /* old extent at offset idx */
506
507 /*
508 * Get the record referred to by idx.
509 */
510 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &prev);
511 /*
512 * If it's a real allocation record, and the new allocation ends
513 * after the start of the referred to record, then we're filling
514 * in a delayed or unwritten allocation with a real one, or
515 * converting real back to unwritten.
516 */
517 if (!isnullstartblock(new->br_startblock) &&
518 new->br_startoff + new->br_blockcount > prev.br_startoff) {
519 if (prev.br_state != XFS_EXT_UNWRITTEN &&
520 isnullstartblock(prev.br_startblock)) {
521 da_old = startblockval(prev.br_startblock);
522 if (cur)
523 ASSERT(cur->bc_private.b.flags &
524 XFS_BTCUR_BPRV_WASDEL);
525 error = xfs_bmap_add_extent_delay_real(tp, ip,
526 idx, &cur, new, &da_new,
527 first, flist, &logflags);
528 } else {
529 ASSERT(new->br_state == XFS_EXT_NORM ||
530 new->br_state == XFS_EXT_UNWRITTEN);
531
532 error = xfs_bmap_add_extent_unwritten_real(ip,
533 idx, &cur, new, &logflags);
534 if (error)
535 goto done;
536 }
537 }
538 /*
539 * Otherwise we're filling in a hole with an allocation.
540 */
541 else {
542 if (cur)
543 ASSERT((cur->bc_private.b.flags &
544 XFS_BTCUR_BPRV_WASDEL) == 0);
545 error = xfs_bmap_add_extent_hole_real(ip, idx, cur,
546 new, &logflags, whichfork);
547 }
548 }
549
550 if (error)
551 goto done;
552 ASSERT(*curp == cur || *curp == NULL);
553
554 /*
555 * Convert to a btree if necessary.
556 */
557 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
558 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
559 int tmp_logflags; /* partial log flag return val */
560
561 ASSERT(cur == NULL);
562 error = xfs_bmap_extents_to_btree(tp, ip, first,
563 flist, &cur, da_old > 0, &tmp_logflags, whichfork);
564 logflags |= tmp_logflags;
565 if (error)
566 goto done;
567 }
568 /*
569 * Adjust for changes in reserved delayed indirect blocks.
570 * Nothing to do for disk quotas here.
571 */
572 if (da_old || da_new) {
573 xfs_filblks_t nblks;
574
575 nblks = da_new;
576 if (cur)
577 nblks += cur->bc_private.b.allocated;
578 ASSERT(nblks <= da_old);
579 if (nblks < da_old)
580 xfs_icsb_modify_counters(ip->i_mount, XFS_SBS_FDBLOCKS,
581 (int64_t)(da_old - nblks), 0);
582 }
583 /*
584 * Clear out the allocated field, done with it now in any case.
585 */
586 if (cur) {
587 cur->bc_private.b.allocated = 0;
588 *curp = cur;
589 }
590 done:
591 #ifdef DEBUG
592 if (!error)
593 xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
594 #endif
595 *logflagsp = logflags;
596 return error;
597 }
598
599 /*
600 * Called by xfs_bmap_add_extent to handle cases converting a delayed
601 * allocation to a real allocation.
602 */
603 STATIC int /* error */
604 xfs_bmap_add_extent_delay_real(
605 struct xfs_trans *tp, /* transaction pointer */
606 xfs_inode_t *ip, /* incore inode pointer */
607 xfs_extnum_t *idx, /* extent number to update/insert */
608 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
609 xfs_bmbt_irec_t *new, /* new data to add to file extents */
610 xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
611 xfs_fsblock_t *first, /* pointer to firstblock variable */
612 xfs_bmap_free_t *flist, /* list of extents to be freed */
613 int *logflagsp) /* inode logging flags */
614 {
615 xfs_btree_cur_t *cur; /* btree cursor */
616 int diff; /* temp value */
617 xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
618 int error; /* error return value */
619 int i; /* temp state */
620 xfs_ifork_t *ifp; /* inode fork pointer */
621 xfs_fileoff_t new_endoff; /* end offset of new entry */
622 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
623 /* left is 0, right is 1, prev is 2 */
624 int rval=0; /* return value (logging flags) */
625 int state = 0;/* state bits, accessed thru macros */
626 xfs_filblks_t temp=0; /* value for dnew calculations */
627 xfs_filblks_t temp2=0;/* value for dnew calculations */
628 int tmp_rval; /* partial logging flags */
629
630 #define LEFT r[0]
631 #define RIGHT r[1]
632 #define PREV r[2]
633
634 /*
635 * Set up a bunch of variables to make the tests simpler.
636 */
637 cur = *curp;
638 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
639 ep = xfs_iext_get_ext(ifp, *idx);
640 xfs_bmbt_get_all(ep, &PREV);
641 new_endoff = new->br_startoff + new->br_blockcount;
642 ASSERT(PREV.br_startoff <= new->br_startoff);
643 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
644
645 /*
646 * Set flags determining what part of the previous delayed allocation
647 * extent is being replaced by a real allocation.
648 */
649 if (PREV.br_startoff == new->br_startoff)
650 state |= BMAP_LEFT_FILLING;
651 if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
652 state |= BMAP_RIGHT_FILLING;
653
654 /*
655 * Check and set flags if this segment has a left neighbor.
656 * Don't set contiguous if the combined extent would be too large.
657 */
658 if (*idx > 0) {
659 state |= BMAP_LEFT_VALID;
660 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &LEFT);
661
662 if (isnullstartblock(LEFT.br_startblock))
663 state |= BMAP_LEFT_DELAY;
664 }
665
666 if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
667 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
668 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
669 LEFT.br_state == new->br_state &&
670 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
671 state |= BMAP_LEFT_CONTIG;
672
673 /*
674 * Check and set flags if this segment has a right neighbor.
675 * Don't set contiguous if the combined extent would be too large.
676 * Also check for all-three-contiguous being too large.
677 */
678 if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
679 state |= BMAP_RIGHT_VALID;
680 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx + 1), &RIGHT);
681
682 if (isnullstartblock(RIGHT.br_startblock))
683 state |= BMAP_RIGHT_DELAY;
684 }
685
686 if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
687 new_endoff == RIGHT.br_startoff &&
688 new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
689 new->br_state == RIGHT.br_state &&
690 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
691 ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
692 BMAP_RIGHT_FILLING)) !=
693 (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
694 BMAP_RIGHT_FILLING) ||
695 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
696 <= MAXEXTLEN))
697 state |= BMAP_RIGHT_CONTIG;
698
699 error = 0;
700 /*
701 * Switch out based on the FILLING and CONTIG state bits.
702 */
703 switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
704 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
705 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
706 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
707 /*
708 * Filling in all of a previously delayed allocation extent.
709 * The left and right neighbors are both contiguous with new.
710 */
711 --*idx;
712 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
713 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
714 LEFT.br_blockcount + PREV.br_blockcount +
715 RIGHT.br_blockcount);
716 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
717
718 xfs_iext_remove(ip, *idx + 1, 2, state);
719 ip->i_d.di_nextents--;
720 if (cur == NULL)
721 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
722 else {
723 rval = XFS_ILOG_CORE;
724 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
725 RIGHT.br_startblock,
726 RIGHT.br_blockcount, &i)))
727 goto done;
728 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
729 if ((error = xfs_btree_delete(cur, &i)))
730 goto done;
731 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
732 if ((error = xfs_btree_decrement(cur, 0, &i)))
733 goto done;
734 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
735 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
736 LEFT.br_startblock,
737 LEFT.br_blockcount +
738 PREV.br_blockcount +
739 RIGHT.br_blockcount, LEFT.br_state)))
740 goto done;
741 }
742 *dnew = 0;
743 break;
744
745 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
746 /*
747 * Filling in all of a previously delayed allocation extent.
748 * The left neighbor is contiguous, the right is not.
749 */
750 --*idx;
751
752 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
753 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
754 LEFT.br_blockcount + PREV.br_blockcount);
755 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
756
757 xfs_iext_remove(ip, *idx + 1, 1, state);
758 if (cur == NULL)
759 rval = XFS_ILOG_DEXT;
760 else {
761 rval = 0;
762 if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
763 LEFT.br_startblock, LEFT.br_blockcount,
764 &i)))
765 goto done;
766 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
767 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
768 LEFT.br_startblock,
769 LEFT.br_blockcount +
770 PREV.br_blockcount, LEFT.br_state)))
771 goto done;
772 }
773 *dnew = 0;
774 break;
775
776 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
777 /*
778 * Filling in all of a previously delayed allocation extent.
779 * The right neighbor is contiguous, the left is not.
780 */
781 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
782 xfs_bmbt_set_startblock(ep, new->br_startblock);
783 xfs_bmbt_set_blockcount(ep,
784 PREV.br_blockcount + RIGHT.br_blockcount);
785 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
786
787 xfs_iext_remove(ip, *idx + 1, 1, state);
788 if (cur == NULL)
789 rval = XFS_ILOG_DEXT;
790 else {
791 rval = 0;
792 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
793 RIGHT.br_startblock,
794 RIGHT.br_blockcount, &i)))
795 goto done;
796 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
797 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
798 new->br_startblock,
799 PREV.br_blockcount +
800 RIGHT.br_blockcount, PREV.br_state)))
801 goto done;
802 }
803
804 *dnew = 0;
805 break;
806
807 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
808 /*
809 * Filling in all of a previously delayed allocation extent.
810 * Neither the left nor right neighbors are contiguous with
811 * the new one.
812 */
813 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
814 xfs_bmbt_set_startblock(ep, new->br_startblock);
815 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
816
817 ip->i_d.di_nextents++;
818 if (cur == NULL)
819 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
820 else {
821 rval = XFS_ILOG_CORE;
822 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
823 new->br_startblock, new->br_blockcount,
824 &i)))
825 goto done;
826 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
827 cur->bc_rec.b.br_state = XFS_EXT_NORM;
828 if ((error = xfs_btree_insert(cur, &i)))
829 goto done;
830 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
831 }
832
833 *dnew = 0;
834 break;
835
836 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
837 /*
838 * Filling in the first part of a previous delayed allocation.
839 * The left neighbor is contiguous.
840 */
841 trace_xfs_bmap_pre_update(ip, *idx - 1, state, _THIS_IP_);
842 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx - 1),
843 LEFT.br_blockcount + new->br_blockcount);
844 xfs_bmbt_set_startoff(ep,
845 PREV.br_startoff + new->br_blockcount);
846 trace_xfs_bmap_post_update(ip, *idx - 1, state, _THIS_IP_);
847
848 temp = PREV.br_blockcount - new->br_blockcount;
849 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
850 xfs_bmbt_set_blockcount(ep, temp);
851 if (cur == NULL)
852 rval = XFS_ILOG_DEXT;
853 else {
854 rval = 0;
855 if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
856 LEFT.br_startblock, LEFT.br_blockcount,
857 &i)))
858 goto done;
859 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
860 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
861 LEFT.br_startblock,
862 LEFT.br_blockcount +
863 new->br_blockcount,
864 LEFT.br_state)))
865 goto done;
866 }
867 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
868 startblockval(PREV.br_startblock));
869 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
870 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
871
872 --*idx;
873 *dnew = temp;
874 break;
875
876 case BMAP_LEFT_FILLING:
877 /*
878 * Filling in the first part of a previous delayed allocation.
879 * The left neighbor is not contiguous.
880 */
881 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
882 xfs_bmbt_set_startoff(ep, new_endoff);
883 temp = PREV.br_blockcount - new->br_blockcount;
884 xfs_bmbt_set_blockcount(ep, temp);
885 xfs_iext_insert(ip, *idx, 1, new, state);
886 ip->i_d.di_nextents++;
887 if (cur == NULL)
888 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
889 else {
890 rval = XFS_ILOG_CORE;
891 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
892 new->br_startblock, new->br_blockcount,
893 &i)))
894 goto done;
895 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
896 cur->bc_rec.b.br_state = XFS_EXT_NORM;
897 if ((error = xfs_btree_insert(cur, &i)))
898 goto done;
899 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
900 }
901 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
902 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
903 error = xfs_bmap_extents_to_btree(tp, ip,
904 first, flist, &cur, 1, &tmp_rval,
905 XFS_DATA_FORK);
906 rval |= tmp_rval;
907 if (error)
908 goto done;
909 }
910 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
911 startblockval(PREV.br_startblock) -
912 (cur ? cur->bc_private.b.allocated : 0));
913 ep = xfs_iext_get_ext(ifp, *idx + 1);
914 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
915 trace_xfs_bmap_post_update(ip, *idx + 1, state, _THIS_IP_);
916
917 *dnew = temp;
918 break;
919
920 case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
921 /*
922 * Filling in the last part of a previous delayed allocation.
923 * The right neighbor is contiguous with the new allocation.
924 */
925 temp = PREV.br_blockcount - new->br_blockcount;
926 trace_xfs_bmap_pre_update(ip, *idx + 1, state, _THIS_IP_);
927 xfs_bmbt_set_blockcount(ep, temp);
928 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx + 1),
929 new->br_startoff, new->br_startblock,
930 new->br_blockcount + RIGHT.br_blockcount,
931 RIGHT.br_state);
932 trace_xfs_bmap_post_update(ip, *idx + 1, state, _THIS_IP_);
933 if (cur == NULL)
934 rval = XFS_ILOG_DEXT;
935 else {
936 rval = 0;
937 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
938 RIGHT.br_startblock,
939 RIGHT.br_blockcount, &i)))
940 goto done;
941 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
942 if ((error = xfs_bmbt_update(cur, new->br_startoff,
943 new->br_startblock,
944 new->br_blockcount +
945 RIGHT.br_blockcount,
946 RIGHT.br_state)))
947 goto done;
948 }
949
950 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
951 startblockval(PREV.br_startblock));
952 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
953 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
954 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
955
956 ++*idx;
957 *dnew = temp;
958 break;
959
960 case BMAP_RIGHT_FILLING:
961 /*
962 * Filling in the last part of a previous delayed allocation.
963 * The right neighbor is not contiguous.
964 */
965 temp = PREV.br_blockcount - new->br_blockcount;
966 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
967 xfs_bmbt_set_blockcount(ep, temp);
968 xfs_iext_insert(ip, *idx + 1, 1, new, state);
969 ip->i_d.di_nextents++;
970 if (cur == NULL)
971 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
972 else {
973 rval = XFS_ILOG_CORE;
974 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
975 new->br_startblock, new->br_blockcount,
976 &i)))
977 goto done;
978 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
979 cur->bc_rec.b.br_state = XFS_EXT_NORM;
980 if ((error = xfs_btree_insert(cur, &i)))
981 goto done;
982 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
983 }
984 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
985 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
986 error = xfs_bmap_extents_to_btree(tp, ip,
987 first, flist, &cur, 1, &tmp_rval,
988 XFS_DATA_FORK);
989 rval |= tmp_rval;
990 if (error)
991 goto done;
992 }
993 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
994 startblockval(PREV.br_startblock) -
995 (cur ? cur->bc_private.b.allocated : 0));
996 ep = xfs_iext_get_ext(ifp, *idx);
997 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
998 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
999
1000 ++*idx;
1001 *dnew = temp;
1002 break;
1003
1004 case 0:
1005 /*
1006 * Filling in the middle part of a previous delayed allocation.
1007 * Contiguity is impossible here.
1008 * This case is avoided almost all the time.
1009 *
1010 * We start with a delayed allocation:
1011 *
1012 * +ddddddddddddddddddddddddddddddddddddddddddddddddddddddd+
1013 * PREV @ idx
1014 *
1015 * and we are allocating:
1016 * +rrrrrrrrrrrrrrrrr+
1017 * new
1018 *
1019 * and we set it up for insertion as:
1020 * +ddddddddddddddddddd+rrrrrrrrrrrrrrrrr+ddddddddddddddddd+
1021 * new
1022 * PREV @ idx LEFT RIGHT
1023 * inserted at idx + 1
1024 */
1025 temp = new->br_startoff - PREV.br_startoff;
1026 temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
1027 trace_xfs_bmap_pre_update(ip, *idx, 0, _THIS_IP_);
1028 xfs_bmbt_set_blockcount(ep, temp); /* truncate PREV */
1029 LEFT = *new;
1030 RIGHT.br_state = PREV.br_state;
1031 RIGHT.br_startblock = nullstartblock(
1032 (int)xfs_bmap_worst_indlen(ip, temp2));
1033 RIGHT.br_startoff = new_endoff;
1034 RIGHT.br_blockcount = temp2;
1035 /* insert LEFT (r[0]) and RIGHT (r[1]) at the same time */
1036 xfs_iext_insert(ip, *idx + 1, 2, &LEFT, state);
1037 ip->i_d.di_nextents++;
1038 if (cur == NULL)
1039 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1040 else {
1041 rval = XFS_ILOG_CORE;
1042 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1043 new->br_startblock, new->br_blockcount,
1044 &i)))
1045 goto done;
1046 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1047 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1048 if ((error = xfs_btree_insert(cur, &i)))
1049 goto done;
1050 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1051 }
1052 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1053 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1054 error = xfs_bmap_extents_to_btree(tp, ip,
1055 first, flist, &cur, 1, &tmp_rval,
1056 XFS_DATA_FORK);
1057 rval |= tmp_rval;
1058 if (error)
1059 goto done;
1060 }
1061 temp = xfs_bmap_worst_indlen(ip, temp);
1062 temp2 = xfs_bmap_worst_indlen(ip, temp2);
1063 diff = (int)(temp + temp2 - startblockval(PREV.br_startblock) -
1064 (cur ? cur->bc_private.b.allocated : 0));
1065 if (diff > 0 &&
1066 xfs_icsb_modify_counters(ip->i_mount, XFS_SBS_FDBLOCKS,
1067 -((int64_t)diff), 0)) {
1068 /*
1069 * Ick gross gag me with a spoon.
1070 */
1071 ASSERT(0); /* want to see if this ever happens! */
1072 while (diff > 0) {
1073 if (temp) {
1074 temp--;
1075 diff--;
1076 if (!diff ||
1077 !xfs_icsb_modify_counters(ip->i_mount,
1078 XFS_SBS_FDBLOCKS,
1079 -((int64_t)diff), 0))
1080 break;
1081 }
1082 if (temp2) {
1083 temp2--;
1084 diff--;
1085 if (!diff ||
1086 !xfs_icsb_modify_counters(ip->i_mount,
1087 XFS_SBS_FDBLOCKS,
1088 -((int64_t)diff), 0))
1089 break;
1090 }
1091 }
1092 }
1093 ep = xfs_iext_get_ext(ifp, *idx);
1094 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
1095 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1096 trace_xfs_bmap_pre_update(ip, *idx + 2, state, _THIS_IP_);
1097 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx + 2),
1098 nullstartblock((int)temp2));
1099 trace_xfs_bmap_post_update(ip, *idx + 2, state, _THIS_IP_);
1100
1101 ++*idx;
1102 *dnew = temp + temp2;
1103 break;
1104
1105 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1106 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1107 case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
1108 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1109 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1110 case BMAP_LEFT_CONTIG:
1111 case BMAP_RIGHT_CONTIG:
1112 /*
1113 * These cases are all impossible.
1114 */
1115 ASSERT(0);
1116 }
1117 *curp = cur;
1118 done:
1119 *logflagsp = rval;
1120 return error;
1121 #undef LEFT
1122 #undef RIGHT
1123 #undef PREV
1124 }
1125
1126 /*
1127 * Called by xfs_bmap_add_extent to handle cases converting an unwritten
1128 * allocation to a real allocation or vice versa.
1129 */
1130 STATIC int /* error */
1131 xfs_bmap_add_extent_unwritten_real(
1132 xfs_inode_t *ip, /* incore inode pointer */
1133 xfs_extnum_t *idx, /* extent number to update/insert */
1134 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
1135 xfs_bmbt_irec_t *new, /* new data to add to file extents */
1136 int *logflagsp) /* inode logging flags */
1137 {
1138 xfs_btree_cur_t *cur; /* btree cursor */
1139 xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
1140 int error; /* error return value */
1141 int i; /* temp state */
1142 xfs_ifork_t *ifp; /* inode fork pointer */
1143 xfs_fileoff_t new_endoff; /* end offset of new entry */
1144 xfs_exntst_t newext; /* new extent state */
1145 xfs_exntst_t oldext; /* old extent state */
1146 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
1147 /* left is 0, right is 1, prev is 2 */
1148 int rval=0; /* return value (logging flags) */
1149 int state = 0;/* state bits, accessed thru macros */
1150
1151 #define LEFT r[0]
1152 #define RIGHT r[1]
1153 #define PREV r[2]
1154 /*
1155 * Set up a bunch of variables to make the tests simpler.
1156 */
1157 error = 0;
1158 cur = *curp;
1159 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1160 ep = xfs_iext_get_ext(ifp, *idx);
1161 xfs_bmbt_get_all(ep, &PREV);
1162 newext = new->br_state;
1163 oldext = (newext == XFS_EXT_UNWRITTEN) ?
1164 XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
1165 ASSERT(PREV.br_state == oldext);
1166 new_endoff = new->br_startoff + new->br_blockcount;
1167 ASSERT(PREV.br_startoff <= new->br_startoff);
1168 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
1169
1170 /*
1171 * Set flags determining what part of the previous oldext allocation
1172 * extent is being replaced by a newext allocation.
1173 */
1174 if (PREV.br_startoff == new->br_startoff)
1175 state |= BMAP_LEFT_FILLING;
1176 if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
1177 state |= BMAP_RIGHT_FILLING;
1178
1179 /*
1180 * Check and set flags if this segment has a left neighbor.
1181 * Don't set contiguous if the combined extent would be too large.
1182 */
1183 if (*idx > 0) {
1184 state |= BMAP_LEFT_VALID;
1185 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &LEFT);
1186
1187 if (isnullstartblock(LEFT.br_startblock))
1188 state |= BMAP_LEFT_DELAY;
1189 }
1190
1191 if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
1192 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
1193 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
1194 LEFT.br_state == newext &&
1195 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1196 state |= BMAP_LEFT_CONTIG;
1197
1198 /*
1199 * Check and set flags if this segment has a right neighbor.
1200 * Don't set contiguous if the combined extent would be too large.
1201 * Also check for all-three-contiguous being too large.
1202 */
1203 if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
1204 state |= BMAP_RIGHT_VALID;
1205 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx + 1), &RIGHT);
1206 if (isnullstartblock(RIGHT.br_startblock))
1207 state |= BMAP_RIGHT_DELAY;
1208 }
1209
1210 if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
1211 new_endoff == RIGHT.br_startoff &&
1212 new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
1213 newext == RIGHT.br_state &&
1214 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
1215 ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
1216 BMAP_RIGHT_FILLING)) !=
1217 (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
1218 BMAP_RIGHT_FILLING) ||
1219 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
1220 <= MAXEXTLEN))
1221 state |= BMAP_RIGHT_CONTIG;
1222
1223 /*
1224 * Switch out based on the FILLING and CONTIG state bits.
1225 */
1226 switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
1227 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
1228 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
1229 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1230 /*
1231 * Setting all of a previous oldext extent to newext.
1232 * The left and right neighbors are both contiguous with new.
1233 */
1234 --*idx;
1235
1236 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1237 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
1238 LEFT.br_blockcount + PREV.br_blockcount +
1239 RIGHT.br_blockcount);
1240 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1241
1242 xfs_iext_remove(ip, *idx + 1, 2, state);
1243 ip->i_d.di_nextents -= 2;
1244 if (cur == NULL)
1245 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1246 else {
1247 rval = XFS_ILOG_CORE;
1248 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1249 RIGHT.br_startblock,
1250 RIGHT.br_blockcount, &i)))
1251 goto done;
1252 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1253 if ((error = xfs_btree_delete(cur, &i)))
1254 goto done;
1255 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1256 if ((error = xfs_btree_decrement(cur, 0, &i)))
1257 goto done;
1258 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1259 if ((error = xfs_btree_delete(cur, &i)))
1260 goto done;
1261 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1262 if ((error = xfs_btree_decrement(cur, 0, &i)))
1263 goto done;
1264 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1265 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1266 LEFT.br_startblock,
1267 LEFT.br_blockcount + PREV.br_blockcount +
1268 RIGHT.br_blockcount, LEFT.br_state)))
1269 goto done;
1270 }
1271 break;
1272
1273 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1274 /*
1275 * Setting all of a previous oldext extent to newext.
1276 * The left neighbor is contiguous, the right is not.
1277 */
1278 --*idx;
1279
1280 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1281 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
1282 LEFT.br_blockcount + PREV.br_blockcount);
1283 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1284
1285 xfs_iext_remove(ip, *idx + 1, 1, state);
1286 ip->i_d.di_nextents--;
1287 if (cur == NULL)
1288 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1289 else {
1290 rval = XFS_ILOG_CORE;
1291 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1292 PREV.br_startblock, PREV.br_blockcount,
1293 &i)))
1294 goto done;
1295 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1296 if ((error = xfs_btree_delete(cur, &i)))
1297 goto done;
1298 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1299 if ((error = xfs_btree_decrement(cur, 0, &i)))
1300 goto done;
1301 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1302 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1303 LEFT.br_startblock,
1304 LEFT.br_blockcount + PREV.br_blockcount,
1305 LEFT.br_state)))
1306 goto done;
1307 }
1308 break;
1309
1310 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1311 /*
1312 * Setting all of a previous oldext extent to newext.
1313 * The right neighbor is contiguous, the left is not.
1314 */
1315 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1316 xfs_bmbt_set_blockcount(ep,
1317 PREV.br_blockcount + RIGHT.br_blockcount);
1318 xfs_bmbt_set_state(ep, newext);
1319 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1320 xfs_iext_remove(ip, *idx + 1, 1, state);
1321 ip->i_d.di_nextents--;
1322 if (cur == NULL)
1323 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1324 else {
1325 rval = XFS_ILOG_CORE;
1326 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1327 RIGHT.br_startblock,
1328 RIGHT.br_blockcount, &i)))
1329 goto done;
1330 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1331 if ((error = xfs_btree_delete(cur, &i)))
1332 goto done;
1333 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1334 if ((error = xfs_btree_decrement(cur, 0, &i)))
1335 goto done;
1336 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1337 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1338 new->br_startblock,
1339 new->br_blockcount + RIGHT.br_blockcount,
1340 newext)))
1341 goto done;
1342 }
1343 break;
1344
1345 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
1346 /*
1347 * Setting all of a previous oldext extent to newext.
1348 * Neither the left nor right neighbors are contiguous with
1349 * the new one.
1350 */
1351 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1352 xfs_bmbt_set_state(ep, newext);
1353 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1354
1355 if (cur == NULL)
1356 rval = XFS_ILOG_DEXT;
1357 else {
1358 rval = 0;
1359 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1360 new->br_startblock, new->br_blockcount,
1361 &i)))
1362 goto done;
1363 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1364 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1365 new->br_startblock, new->br_blockcount,
1366 newext)))
1367 goto done;
1368 }
1369 break;
1370
1371 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
1372 /*
1373 * Setting the first part of a previous oldext extent to newext.
1374 * The left neighbor is contiguous.
1375 */
1376 trace_xfs_bmap_pre_update(ip, *idx - 1, state, _THIS_IP_);
1377 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx - 1),
1378 LEFT.br_blockcount + new->br_blockcount);
1379 xfs_bmbt_set_startoff(ep,
1380 PREV.br_startoff + new->br_blockcount);
1381 trace_xfs_bmap_post_update(ip, *idx - 1, state, _THIS_IP_);
1382
1383 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1384 xfs_bmbt_set_startblock(ep,
1385 new->br_startblock + new->br_blockcount);
1386 xfs_bmbt_set_blockcount(ep,
1387 PREV.br_blockcount - new->br_blockcount);
1388 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1389
1390 --*idx;
1391
1392 if (cur == NULL)
1393 rval = XFS_ILOG_DEXT;
1394 else {
1395 rval = 0;
1396 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1397 PREV.br_startblock, PREV.br_blockcount,
1398 &i)))
1399 goto done;
1400 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1401 if ((error = xfs_bmbt_update(cur,
1402 PREV.br_startoff + new->br_blockcount,
1403 PREV.br_startblock + new->br_blockcount,
1404 PREV.br_blockcount - new->br_blockcount,
1405 oldext)))
1406 goto done;
1407 if ((error = xfs_btree_decrement(cur, 0, &i)))
1408 goto done;
1409 if (xfs_bmbt_update(cur, LEFT.br_startoff,
1410 LEFT.br_startblock,
1411 LEFT.br_blockcount + new->br_blockcount,
1412 LEFT.br_state))
1413 goto done;
1414 }
1415 break;
1416
1417 case BMAP_LEFT_FILLING:
1418 /*
1419 * Setting the first part of a previous oldext extent to newext.
1420 * The left neighbor is not contiguous.
1421 */
1422 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1423 ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
1424 xfs_bmbt_set_startoff(ep, new_endoff);
1425 xfs_bmbt_set_blockcount(ep,
1426 PREV.br_blockcount - new->br_blockcount);
1427 xfs_bmbt_set_startblock(ep,
1428 new->br_startblock + new->br_blockcount);
1429 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1430
1431 xfs_iext_insert(ip, *idx, 1, new, state);
1432 ip->i_d.di_nextents++;
1433 if (cur == NULL)
1434 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1435 else {
1436 rval = XFS_ILOG_CORE;
1437 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1438 PREV.br_startblock, PREV.br_blockcount,
1439 &i)))
1440 goto done;
1441 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1442 if ((error = xfs_bmbt_update(cur,
1443 PREV.br_startoff + new->br_blockcount,
1444 PREV.br_startblock + new->br_blockcount,
1445 PREV.br_blockcount - new->br_blockcount,
1446 oldext)))
1447 goto done;
1448 cur->bc_rec.b = *new;
1449 if ((error = xfs_btree_insert(cur, &i)))
1450 goto done;
1451 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1452 }
1453 break;
1454
1455 case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1456 /*
1457 * Setting the last part of a previous oldext extent to newext.
1458 * The right neighbor is contiguous with the new allocation.
1459 */
1460 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1461 xfs_bmbt_set_blockcount(ep,
1462 PREV.br_blockcount - new->br_blockcount);
1463 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1464
1465 ++*idx;
1466
1467 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1468 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
1469 new->br_startoff, new->br_startblock,
1470 new->br_blockcount + RIGHT.br_blockcount, newext);
1471 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1472
1473 if (cur == NULL)
1474 rval = XFS_ILOG_DEXT;
1475 else {
1476 rval = 0;
1477 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1478 PREV.br_startblock,
1479 PREV.br_blockcount, &i)))
1480 goto done;
1481 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1482 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1483 PREV.br_startblock,
1484 PREV.br_blockcount - new->br_blockcount,
1485 oldext)))
1486 goto done;
1487 if ((error = xfs_btree_increment(cur, 0, &i)))
1488 goto done;
1489 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1490 new->br_startblock,
1491 new->br_blockcount + RIGHT.br_blockcount,
1492 newext)))
1493 goto done;
1494 }
1495 break;
1496
1497 case BMAP_RIGHT_FILLING:
1498 /*
1499 * Setting the last part of a previous oldext extent to newext.
1500 * The right neighbor is not contiguous.
1501 */
1502 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1503 xfs_bmbt_set_blockcount(ep,
1504 PREV.br_blockcount - new->br_blockcount);
1505 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1506
1507 ++*idx;
1508 xfs_iext_insert(ip, *idx, 1, new, state);
1509
1510 ip->i_d.di_nextents++;
1511 if (cur == NULL)
1512 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1513 else {
1514 rval = XFS_ILOG_CORE;
1515 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1516 PREV.br_startblock, PREV.br_blockcount,
1517 &i)))
1518 goto done;
1519 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1520 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1521 PREV.br_startblock,
1522 PREV.br_blockcount - new->br_blockcount,
1523 oldext)))
1524 goto done;
1525 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1526 new->br_startblock, new->br_blockcount,
1527 &i)))
1528 goto done;
1529 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1530 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1531 if ((error = xfs_btree_insert(cur, &i)))
1532 goto done;
1533 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1534 }
1535 break;
1536
1537 case 0:
1538 /*
1539 * Setting the middle part of a previous oldext extent to
1540 * newext. Contiguity is impossible here.
1541 * One extent becomes three extents.
1542 */
1543 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1544 xfs_bmbt_set_blockcount(ep,
1545 new->br_startoff - PREV.br_startoff);
1546 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1547
1548 r[0] = *new;
1549 r[1].br_startoff = new_endoff;
1550 r[1].br_blockcount =
1551 PREV.br_startoff + PREV.br_blockcount - new_endoff;
1552 r[1].br_startblock = new->br_startblock + new->br_blockcount;
1553 r[1].br_state = oldext;
1554
1555 ++*idx;
1556 xfs_iext_insert(ip, *idx, 2, &r[0], state);
1557
1558 ip->i_d.di_nextents += 2;
1559 if (cur == NULL)
1560 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1561 else {
1562 rval = XFS_ILOG_CORE;
1563 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1564 PREV.br_startblock, PREV.br_blockcount,
1565 &i)))
1566 goto done;
1567 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1568 /* new right extent - oldext */
1569 if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
1570 r[1].br_startblock, r[1].br_blockcount,
1571 r[1].br_state)))
1572 goto done;
1573 /* new left extent - oldext */
1574 cur->bc_rec.b = PREV;
1575 cur->bc_rec.b.br_blockcount =
1576 new->br_startoff - PREV.br_startoff;
1577 if ((error = xfs_btree_insert(cur, &i)))
1578 goto done;
1579 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1580 /*
1581 * Reset the cursor to the position of the new extent
1582 * we are about to insert as we can't trust it after
1583 * the previous insert.
1584 */
1585 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1586 new->br_startblock, new->br_blockcount,
1587 &i)))
1588 goto done;
1589 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1590 /* new middle extent - newext */
1591 cur->bc_rec.b.br_state = new->br_state;
1592 if ((error = xfs_btree_insert(cur, &i)))
1593 goto done;
1594 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1595 }
1596 break;
1597
1598 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1599 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1600 case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
1601 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1602 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1603 case BMAP_LEFT_CONTIG:
1604 case BMAP_RIGHT_CONTIG:
1605 /*
1606 * These cases are all impossible.
1607 */
1608 ASSERT(0);
1609 }
1610 *curp = cur;
1611 done:
1612 *logflagsp = rval;
1613 return error;
1614 #undef LEFT
1615 #undef RIGHT
1616 #undef PREV
1617 }
1618
1619 /*
1620 * Called by xfs_bmap_add_extent to handle cases converting a hole
1621 * to a delayed allocation.
1622 */
1623 /*ARGSUSED*/
1624 STATIC int /* error */
1625 xfs_bmap_add_extent_hole_delay(
1626 xfs_inode_t *ip, /* incore inode pointer */
1627 xfs_extnum_t *idx, /* extent number to update/insert */
1628 xfs_bmbt_irec_t *new, /* new data to add to file extents */
1629 int *logflagsp) /* inode logging flags */
1630 {
1631 xfs_ifork_t *ifp; /* inode fork pointer */
1632 xfs_bmbt_irec_t left; /* left neighbor extent entry */
1633 xfs_filblks_t newlen=0; /* new indirect size */
1634 xfs_filblks_t oldlen=0; /* old indirect size */
1635 xfs_bmbt_irec_t right; /* right neighbor extent entry */
1636 int state; /* state bits, accessed thru macros */
1637 xfs_filblks_t temp=0; /* temp for indirect calculations */
1638
1639 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1640 state = 0;
1641 ASSERT(isnullstartblock(new->br_startblock));
1642
1643 /*
1644 * Check and set flags if this segment has a left neighbor
1645 */
1646 if (*idx > 0) {
1647 state |= BMAP_LEFT_VALID;
1648 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &left);
1649
1650 if (isnullstartblock(left.br_startblock))
1651 state |= BMAP_LEFT_DELAY;
1652 }
1653
1654 /*
1655 * Check and set flags if the current (right) segment exists.
1656 * If it doesn't exist, we're converting the hole at end-of-file.
1657 */
1658 if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
1659 state |= BMAP_RIGHT_VALID;
1660 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right);
1661
1662 if (isnullstartblock(right.br_startblock))
1663 state |= BMAP_RIGHT_DELAY;
1664 }
1665
1666 /*
1667 * Set contiguity flags on the left and right neighbors.
1668 * Don't let extents get too large, even if the pieces are contiguous.
1669 */
1670 if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) &&
1671 left.br_startoff + left.br_blockcount == new->br_startoff &&
1672 left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1673 state |= BMAP_LEFT_CONTIG;
1674
1675 if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) &&
1676 new->br_startoff + new->br_blockcount == right.br_startoff &&
1677 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
1678 (!(state & BMAP_LEFT_CONTIG) ||
1679 (left.br_blockcount + new->br_blockcount +
1680 right.br_blockcount <= MAXEXTLEN)))
1681 state |= BMAP_RIGHT_CONTIG;
1682
1683 /*
1684 * Switch out based on the contiguity flags.
1685 */
1686 switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
1687 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1688 /*
1689 * New allocation is contiguous with delayed allocations
1690 * on the left and on the right.
1691 * Merge all three into a single extent record.
1692 */
1693 --*idx;
1694 temp = left.br_blockcount + new->br_blockcount +
1695 right.br_blockcount;
1696
1697 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1698 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
1699 oldlen = startblockval(left.br_startblock) +
1700 startblockval(new->br_startblock) +
1701 startblockval(right.br_startblock);
1702 newlen = xfs_bmap_worst_indlen(ip, temp);
1703 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
1704 nullstartblock((int)newlen));
1705 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1706
1707 xfs_iext_remove(ip, *idx + 1, 1, state);
1708 break;
1709
1710 case BMAP_LEFT_CONTIG:
1711 /*
1712 * New allocation is contiguous with a delayed allocation
1713 * on the left.
1714 * Merge the new allocation with the left neighbor.
1715 */
1716 --*idx;
1717 temp = left.br_blockcount + new->br_blockcount;
1718
1719 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1720 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
1721 oldlen = startblockval(left.br_startblock) +
1722 startblockval(new->br_startblock);
1723 newlen = xfs_bmap_worst_indlen(ip, temp);
1724 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
1725 nullstartblock((int)newlen));
1726 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1727 break;
1728
1729 case BMAP_RIGHT_CONTIG:
1730 /*
1731 * New allocation is contiguous with a delayed allocation
1732 * on the right.
1733 * Merge the new allocation with the right neighbor.
1734 */
1735 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1736 temp = new->br_blockcount + right.br_blockcount;
1737 oldlen = startblockval(new->br_startblock) +
1738 startblockval(right.br_startblock);
1739 newlen = xfs_bmap_worst_indlen(ip, temp);
1740 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
1741 new->br_startoff,
1742 nullstartblock((int)newlen), temp, right.br_state);
1743 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1744 break;
1745
1746 case 0:
1747 /*
1748 * New allocation is not contiguous with another
1749 * delayed allocation.
1750 * Insert a new entry.
1751 */
1752 oldlen = newlen = 0;
1753 xfs_iext_insert(ip, *idx, 1, new, state);
1754 break;
1755 }
1756 if (oldlen != newlen) {
1757 ASSERT(oldlen > newlen);
1758 xfs_icsb_modify_counters(ip->i_mount, XFS_SBS_FDBLOCKS,
1759 (int64_t)(oldlen - newlen), 0);
1760 /*
1761 * Nothing to do for disk quota accounting here.
1762 */
1763 }
1764 *logflagsp = 0;
1765 return 0;
1766 }
1767
1768 /*
1769 * Called by xfs_bmap_add_extent to handle cases converting a hole
1770 * to a real allocation.
1771 */
1772 STATIC int /* error */
1773 xfs_bmap_add_extent_hole_real(
1774 xfs_inode_t *ip, /* incore inode pointer */
1775 xfs_extnum_t *idx, /* extent number to update/insert */
1776 xfs_btree_cur_t *cur, /* if null, not a btree */
1777 xfs_bmbt_irec_t *new, /* new data to add to file extents */
1778 int *logflagsp, /* inode logging flags */
1779 int whichfork) /* data or attr fork */
1780 {
1781 int error; /* error return value */
1782 int i; /* temp state */
1783 xfs_ifork_t *ifp; /* inode fork pointer */
1784 xfs_bmbt_irec_t left; /* left neighbor extent entry */
1785 xfs_bmbt_irec_t right; /* right neighbor extent entry */
1786 int rval=0; /* return value (logging flags) */
1787 int state; /* state bits, accessed thru macros */
1788
1789 ifp = XFS_IFORK_PTR(ip, whichfork);
1790 ASSERT(*idx <= ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
1791 state = 0;
1792
1793 if (whichfork == XFS_ATTR_FORK)
1794 state |= BMAP_ATTRFORK;
1795
1796 /*
1797 * Check and set flags if this segment has a left neighbor.
1798 */
1799 if (*idx > 0) {
1800 state |= BMAP_LEFT_VALID;
1801 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &left);
1802 if (isnullstartblock(left.br_startblock))
1803 state |= BMAP_LEFT_DELAY;
1804 }
1805
1806 /*
1807 * Check and set flags if this segment has a current value.
1808 * Not true if we're inserting into the "hole" at eof.
1809 */
1810 if (*idx < ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
1811 state |= BMAP_RIGHT_VALID;
1812 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right);
1813 if (isnullstartblock(right.br_startblock))
1814 state |= BMAP_RIGHT_DELAY;
1815 }
1816
1817 /*
1818 * We're inserting a real allocation between "left" and "right".
1819 * Set the contiguity flags. Don't let extents get too large.
1820 */
1821 if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
1822 left.br_startoff + left.br_blockcount == new->br_startoff &&
1823 left.br_startblock + left.br_blockcount == new->br_startblock &&
1824 left.br_state == new->br_state &&
1825 left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1826 state |= BMAP_LEFT_CONTIG;
1827
1828 if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
1829 new->br_startoff + new->br_blockcount == right.br_startoff &&
1830 new->br_startblock + new->br_blockcount == right.br_startblock &&
1831 new->br_state == right.br_state &&
1832 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
1833 (!(state & BMAP_LEFT_CONTIG) ||
1834 left.br_blockcount + new->br_blockcount +
1835 right.br_blockcount <= MAXEXTLEN))
1836 state |= BMAP_RIGHT_CONTIG;
1837
1838 error = 0;
1839 /*
1840 * Select which case we're in here, and implement it.
1841 */
1842 switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
1843 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1844 /*
1845 * New allocation is contiguous with real allocations on the
1846 * left and on the right.
1847 * Merge all three into a single extent record.
1848 */
1849 --*idx;
1850 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1851 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
1852 left.br_blockcount + new->br_blockcount +
1853 right.br_blockcount);
1854 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1855
1856 xfs_iext_remove(ip, *idx + 1, 1, state);
1857
1858 XFS_IFORK_NEXT_SET(ip, whichfork,
1859 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
1860 if (cur == NULL) {
1861 rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
1862 } else {
1863 rval = XFS_ILOG_CORE;
1864 if ((error = xfs_bmbt_lookup_eq(cur,
1865 right.br_startoff,
1866 right.br_startblock,
1867 right.br_blockcount, &i)))
1868 goto done;
1869 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1870 if ((error = xfs_btree_delete(cur, &i)))
1871 goto done;
1872 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1873 if ((error = xfs_btree_decrement(cur, 0, &i)))
1874 goto done;
1875 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1876 if ((error = xfs_bmbt_update(cur, left.br_startoff,
1877 left.br_startblock,
1878 left.br_blockcount +
1879 new->br_blockcount +
1880 right.br_blockcount,
1881 left.br_state)))
1882 goto done;
1883 }
1884 break;
1885
1886 case BMAP_LEFT_CONTIG:
1887 /*
1888 * New allocation is contiguous with a real allocation
1889 * on the left.
1890 * Merge the new allocation with the left neighbor.
1891 */
1892 --*idx;
1893 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1894 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
1895 left.br_blockcount + new->br_blockcount);
1896 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1897
1898 if (cur == NULL) {
1899 rval = xfs_ilog_fext(whichfork);
1900 } else {
1901 rval = 0;
1902 if ((error = xfs_bmbt_lookup_eq(cur,
1903 left.br_startoff,
1904 left.br_startblock,
1905 left.br_blockcount, &i)))
1906 goto done;
1907 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1908 if ((error = xfs_bmbt_update(cur, left.br_startoff,
1909 left.br_startblock,
1910 left.br_blockcount +
1911 new->br_blockcount,
1912 left.br_state)))
1913 goto done;
1914 }
1915 break;
1916
1917 case BMAP_RIGHT_CONTIG:
1918 /*
1919 * New allocation is contiguous with a real allocation
1920 * on the right.
1921 * Merge the new allocation with the right neighbor.
1922 */
1923 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1924 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
1925 new->br_startoff, new->br_startblock,
1926 new->br_blockcount + right.br_blockcount,
1927 right.br_state);
1928 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1929
1930 if (cur == NULL) {
1931 rval = xfs_ilog_fext(whichfork);
1932 } else {
1933 rval = 0;
1934 if ((error = xfs_bmbt_lookup_eq(cur,
1935 right.br_startoff,
1936 right.br_startblock,
1937 right.br_blockcount, &i)))
1938 goto done;
1939 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1940 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1941 new->br_startblock,
1942 new->br_blockcount +
1943 right.br_blockcount,
1944 right.br_state)))
1945 goto done;
1946 }
1947 break;
1948
1949 case 0:
1950 /*
1951 * New allocation is not contiguous with another
1952 * real allocation.
1953 * Insert a new entry.
1954 */
1955 xfs_iext_insert(ip, *idx, 1, new, state);
1956 XFS_IFORK_NEXT_SET(ip, whichfork,
1957 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
1958 if (cur == NULL) {
1959 rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
1960 } else {
1961 rval = XFS_ILOG_CORE;
1962 if ((error = xfs_bmbt_lookup_eq(cur,
1963 new->br_startoff,
1964 new->br_startblock,
1965 new->br_blockcount, &i)))
1966 goto done;
1967 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1968 cur->bc_rec.b.br_state = new->br_state;
1969 if ((error = xfs_btree_insert(cur, &i)))
1970 goto done;
1971 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1972 }
1973 break;
1974 }
1975 done:
1976 *logflagsp = rval;
1977 return error;
1978 }
1979
1980 /*
1981 * Adjust the size of the new extent based on di_extsize and rt extsize.
1982 */
1983 STATIC int
1984 xfs_bmap_extsize_align(
1985 xfs_mount_t *mp,
1986 xfs_bmbt_irec_t *gotp, /* next extent pointer */
1987 xfs_bmbt_irec_t *prevp, /* previous extent pointer */
1988 xfs_extlen_t extsz, /* align to this extent size */
1989 int rt, /* is this a realtime inode? */
1990 int eof, /* is extent at end-of-file? */
1991 int delay, /* creating delalloc extent? */
1992 int convert, /* overwriting unwritten extent? */
1993 xfs_fileoff_t *offp, /* in/out: aligned offset */
1994 xfs_extlen_t *lenp) /* in/out: aligned length */
1995 {
1996 xfs_fileoff_t orig_off; /* original offset */
1997 xfs_extlen_t orig_alen; /* original length */
1998 xfs_fileoff_t orig_end; /* original off+len */
1999 xfs_fileoff_t nexto; /* next file offset */
2000 xfs_fileoff_t prevo; /* previous file offset */
2001 xfs_fileoff_t align_off; /* temp for offset */
2002 xfs_extlen_t align_alen; /* temp for length */
2003 xfs_extlen_t temp; /* temp for calculations */
2004
2005 if (convert)
2006 return 0;
2007
2008 orig_off = align_off = *offp;
2009 orig_alen = align_alen = *lenp;
2010 orig_end = orig_off + orig_alen;
2011
2012 /*
2013 * If this request overlaps an existing extent, then don't
2014 * attempt to perform any additional alignment.
2015 */
2016 if (!delay && !eof &&
2017 (orig_off >= gotp->br_startoff) &&
2018 (orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
2019 return 0;
2020 }
2021
2022 /*
2023 * If the file offset is unaligned vs. the extent size
2024 * we need to align it. This will be possible unless
2025 * the file was previously written with a kernel that didn't
2026 * perform this alignment, or if a truncate shot us in the
2027 * foot.
2028 */
2029 temp = do_mod(orig_off, extsz);
2030 if (temp) {
2031 align_alen += temp;
2032 align_off -= temp;
2033 }
2034 /*
2035 * Same adjustment for the end of the requested area.
2036 */
2037 if ((temp = (align_alen % extsz))) {
2038 align_alen += extsz - temp;
2039 }
2040 /*
2041 * If the previous block overlaps with this proposed allocation
2042 * then move the start forward without adjusting the length.
2043 */
2044 if (prevp->br_startoff != NULLFILEOFF) {
2045 if (prevp->br_startblock == HOLESTARTBLOCK)
2046 prevo = prevp->br_startoff;
2047 else
2048 prevo = prevp->br_startoff + prevp->br_blockcount;
2049 } else
2050 prevo = 0;
2051 if (align_off != orig_off && align_off < prevo)
2052 align_off = prevo;
2053 /*
2054 * If the next block overlaps with this proposed allocation
2055 * then move the start back without adjusting the length,
2056 * but not before offset 0.
2057 * This may of course make the start overlap previous block,
2058 * and if we hit the offset 0 limit then the next block
2059 * can still overlap too.
2060 */
2061 if (!eof && gotp->br_startoff != NULLFILEOFF) {
2062 if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
2063 (!delay && gotp->br_startblock == DELAYSTARTBLOCK))
2064 nexto = gotp->br_startoff + gotp->br_blockcount;
2065 else
2066 nexto = gotp->br_startoff;
2067 } else
2068 nexto = NULLFILEOFF;
2069 if (!eof &&
2070 align_off + align_alen != orig_end &&
2071 align_off + align_alen > nexto)
2072 align_off = nexto > align_alen ? nexto - align_alen : 0;
2073 /*
2074 * If we're now overlapping the next or previous extent that
2075 * means we can't fit an extsz piece in this hole. Just move
2076 * the start forward to the first valid spot and set
2077 * the length so we hit the end.
2078 */
2079 if (align_off != orig_off && align_off < prevo)
2080 align_off = prevo;
2081 if (align_off + align_alen != orig_end &&
2082 align_off + align_alen > nexto &&
2083 nexto != NULLFILEOFF) {
2084 ASSERT(nexto > prevo);
2085 align_alen = nexto - align_off;
2086 }
2087
2088 /*
2089 * If realtime, and the result isn't a multiple of the realtime
2090 * extent size we need to remove blocks until it is.
2091 */
2092 if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
2093 /*
2094 * We're not covering the original request, or
2095 * we won't be able to once we fix the length.
2096 */
2097 if (orig_off < align_off ||
2098 orig_end > align_off + align_alen ||
2099 align_alen - temp < orig_alen)
2100 return XFS_ERROR(EINVAL);
2101 /*
2102 * Try to fix it by moving the start up.
2103 */
2104 if (align_off + temp <= orig_off) {
2105 align_alen -= temp;
2106 align_off += temp;
2107 }
2108 /*
2109 * Try to fix it by moving the end in.
2110 */
2111 else if (align_off + align_alen - temp >= orig_end)
2112 align_alen -= temp;
2113 /*
2114 * Set the start to the minimum then trim the length.
2115 */
2116 else {
2117 align_alen -= orig_off - align_off;
2118 align_off = orig_off;
2119 align_alen -= align_alen % mp->m_sb.sb_rextsize;
2120 }
2121 /*
2122 * Result doesn't cover the request, fail it.
2123 */
2124 if (orig_off < align_off || orig_end > align_off + align_alen)
2125 return XFS_ERROR(EINVAL);
2126 } else {
2127 ASSERT(orig_off >= align_off);
2128 ASSERT(orig_end <= align_off + align_alen);
2129 }
2130
2131 #ifdef DEBUG
2132 if (!eof && gotp->br_startoff != NULLFILEOFF)
2133 ASSERT(align_off + align_alen <= gotp->br_startoff);
2134 if (prevp->br_startoff != NULLFILEOFF)
2135 ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
2136 #endif
2137
2138 *lenp = align_alen;
2139 *offp = align_off;
2140 return 0;
2141 }
2142
2143 #define XFS_ALLOC_GAP_UNITS 4
2144
2145 STATIC void
2146 xfs_bmap_adjacent(
2147 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2148 {
2149 xfs_fsblock_t adjust; /* adjustment to block numbers */
2150 xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
2151 xfs_mount_t *mp; /* mount point structure */
2152 int nullfb; /* true if ap->firstblock isn't set */
2153 int rt; /* true if inode is realtime */
2154
2155 #define ISVALID(x,y) \
2156 (rt ? \
2157 (x) < mp->m_sb.sb_rblocks : \
2158 XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
2159 XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
2160 XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
2161
2162 mp = ap->ip->i_mount;
2163 nullfb = ap->firstblock == NULLFSBLOCK;
2164 rt = XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata;
2165 fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
2166 /*
2167 * If allocating at eof, and there's a previous real block,
2168 * try to use its last block as our starting point.
2169 */
2170 if (ap->eof && ap->prevp->br_startoff != NULLFILEOFF &&
2171 !isnullstartblock(ap->prevp->br_startblock) &&
2172 ISVALID(ap->prevp->br_startblock + ap->prevp->br_blockcount,
2173 ap->prevp->br_startblock)) {
2174 ap->rval = ap->prevp->br_startblock + ap->prevp->br_blockcount;
2175 /*
2176 * Adjust for the gap between prevp and us.
2177 */
2178 adjust = ap->off -
2179 (ap->prevp->br_startoff + ap->prevp->br_blockcount);
2180 if (adjust &&
2181 ISVALID(ap->rval + adjust, ap->prevp->br_startblock))
2182 ap->rval += adjust;
2183 }
2184 /*
2185 * If not at eof, then compare the two neighbor blocks.
2186 * Figure out whether either one gives us a good starting point,
2187 * and pick the better one.
2188 */
2189 else if (!ap->eof) {
2190 xfs_fsblock_t gotbno; /* right side block number */
2191 xfs_fsblock_t gotdiff=0; /* right side difference */
2192 xfs_fsblock_t prevbno; /* left side block number */
2193 xfs_fsblock_t prevdiff=0; /* left side difference */
2194
2195 /*
2196 * If there's a previous (left) block, select a requested
2197 * start block based on it.
2198 */
2199 if (ap->prevp->br_startoff != NULLFILEOFF &&
2200 !isnullstartblock(ap->prevp->br_startblock) &&
2201 (prevbno = ap->prevp->br_startblock +
2202 ap->prevp->br_blockcount) &&
2203 ISVALID(prevbno, ap->prevp->br_startblock)) {
2204 /*
2205 * Calculate gap to end of previous block.
2206 */
2207 adjust = prevdiff = ap->off -
2208 (ap->prevp->br_startoff +
2209 ap->prevp->br_blockcount);
2210 /*
2211 * Figure the startblock based on the previous block's
2212 * end and the gap size.
2213 * Heuristic!
2214 * If the gap is large relative to the piece we're
2215 * allocating, or using it gives us an invalid block
2216 * number, then just use the end of the previous block.
2217 */
2218 if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
2219 ISVALID(prevbno + prevdiff,
2220 ap->prevp->br_startblock))
2221 prevbno += adjust;
2222 else
2223 prevdiff += adjust;
2224 /*
2225 * If the firstblock forbids it, can't use it,
2226 * must use default.
2227 */
2228 if (!rt && !nullfb &&
2229 XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
2230 prevbno = NULLFSBLOCK;
2231 }
2232 /*
2233 * No previous block or can't follow it, just default.
2234 */
2235 else
2236 prevbno = NULLFSBLOCK;
2237 /*
2238 * If there's a following (right) block, select a requested
2239 * start block based on it.
2240 */
2241 if (!isnullstartblock(ap->gotp->br_startblock)) {
2242 /*
2243 * Calculate gap to start of next block.
2244 */
2245 adjust = gotdiff = ap->gotp->br_startoff - ap->off;
2246 /*
2247 * Figure the startblock based on the next block's
2248 * start and the gap size.
2249 */
2250 gotbno = ap->gotp->br_startblock;
2251 /*
2252 * Heuristic!
2253 * If the gap is large relative to the piece we're
2254 * allocating, or using it gives us an invalid block
2255 * number, then just use the start of the next block
2256 * offset by our length.
2257 */
2258 if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
2259 ISVALID(gotbno - gotdiff, gotbno))
2260 gotbno -= adjust;
2261 else if (ISVALID(gotbno - ap->alen, gotbno)) {
2262 gotbno -= ap->alen;
2263 gotdiff += adjust - ap->alen;
2264 } else
2265 gotdiff += adjust;
2266 /*
2267 * If the firstblock forbids it, can't use it,
2268 * must use default.
2269 */
2270 if (!rt && !nullfb &&
2271 XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
2272 gotbno = NULLFSBLOCK;
2273 }
2274 /*
2275 * No next block, just default.
2276 */
2277 else
2278 gotbno = NULLFSBLOCK;
2279 /*
2280 * If both valid, pick the better one, else the only good
2281 * one, else ap->rval is already set (to 0 or the inode block).
2282 */
2283 if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
2284 ap->rval = prevdiff <= gotdiff ? prevbno : gotbno;
2285 else if (prevbno != NULLFSBLOCK)
2286 ap->rval = prevbno;
2287 else if (gotbno != NULLFSBLOCK)
2288 ap->rval = gotbno;
2289 }
2290 #undef ISVALID
2291 }
2292
2293 STATIC int
2294 xfs_bmap_rtalloc(
2295 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2296 {
2297 xfs_alloctype_t atype = 0; /* type for allocation routines */
2298 int error; /* error return value */
2299 xfs_mount_t *mp; /* mount point structure */
2300 xfs_extlen_t prod = 0; /* product factor for allocators */
2301 xfs_extlen_t ralen = 0; /* realtime allocation length */
2302 xfs_extlen_t align; /* minimum allocation alignment */
2303 xfs_rtblock_t rtb;
2304
2305 mp = ap->ip->i_mount;
2306 align = xfs_get_extsz_hint(ap->ip);
2307 prod = align / mp->m_sb.sb_rextsize;
2308 error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
2309 align, 1, ap->eof, 0,
2310 ap->conv, &ap->off, &ap->alen);
2311 if (error)
2312 return error;
2313 ASSERT(ap->alen);
2314 ASSERT(ap->alen % mp->m_sb.sb_rextsize == 0);
2315
2316 /*
2317 * If the offset & length are not perfectly aligned
2318 * then kill prod, it will just get us in trouble.
2319 */
2320 if (do_mod(ap->off, align) || ap->alen % align)
2321 prod = 1;
2322 /*
2323 * Set ralen to be the actual requested length in rtextents.
2324 */
2325 ralen = ap->alen / mp->m_sb.sb_rextsize;
2326 /*
2327 * If the old value was close enough to MAXEXTLEN that
2328 * we rounded up to it, cut it back so it's valid again.
2329 * Note that if it's a really large request (bigger than
2330 * MAXEXTLEN), we don't hear about that number, and can't
2331 * adjust the starting point to match it.
2332 */
2333 if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
2334 ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
2335
2336 /*
2337 * Lock out other modifications to the RT bitmap inode.
2338 */
2339 xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
2340 xfs_trans_ijoin_ref(ap->tp, mp->m_rbmip, XFS_ILOCK_EXCL);
2341
2342 /*
2343 * If it's an allocation to an empty file at offset 0,
2344 * pick an extent that will space things out in the rt area.
2345 */
2346 if (ap->eof && ap->off == 0) {
2347 xfs_rtblock_t uninitialized_var(rtx); /* realtime extent no */
2348
2349 error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
2350 if (error)
2351 return error;
2352 ap->rval = rtx * mp->m_sb.sb_rextsize;
2353 } else {
2354 ap->rval = 0;
2355 }
2356
2357 xfs_bmap_adjacent(ap);
2358
2359 /*
2360 * Realtime allocation, done through xfs_rtallocate_extent.
2361 */
2362 atype = ap->rval == 0 ? XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
2363 do_div(ap->rval, mp->m_sb.sb_rextsize);
2364 rtb = ap->rval;
2365 ap->alen = ralen;
2366 if ((error = xfs_rtallocate_extent(ap->tp, ap->rval, 1, ap->alen,
2367 &ralen, atype, ap->wasdel, prod, &rtb)))
2368 return error;
2369 if (rtb == NULLFSBLOCK && prod > 1 &&
2370 (error = xfs_rtallocate_extent(ap->tp, ap->rval, 1,
2371 ap->alen, &ralen, atype,
2372 ap->wasdel, 1, &rtb)))
2373 return error;
2374 ap->rval = rtb;
2375 if (ap->rval != NULLFSBLOCK) {
2376 ap->rval *= mp->m_sb.sb_rextsize;
2377 ralen *= mp->m_sb.sb_rextsize;
2378 ap->alen = ralen;
2379 ap->ip->i_d.di_nblocks += ralen;
2380 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2381 if (ap->wasdel)
2382 ap->ip->i_delayed_blks -= ralen;
2383 /*
2384 * Adjust the disk quota also. This was reserved
2385 * earlier.
2386 */
2387 xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
2388 ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
2389 XFS_TRANS_DQ_RTBCOUNT, (long) ralen);
2390 } else {
2391 ap->alen = 0;
2392 }
2393 return 0;
2394 }
2395
2396 STATIC int
2397 xfs_bmap_btalloc_nullfb(
2398 struct xfs_bmalloca *ap,
2399 struct xfs_alloc_arg *args,
2400 xfs_extlen_t *blen)
2401 {
2402 struct xfs_mount *mp = ap->ip->i_mount;
2403 struct xfs_perag *pag;
2404 xfs_agnumber_t ag, startag;
2405 int notinit = 0;
2406 int error;
2407
2408 if (ap->userdata && xfs_inode_is_filestream(ap->ip))
2409 args->type = XFS_ALLOCTYPE_NEAR_BNO;
2410 else
2411 args->type = XFS_ALLOCTYPE_START_BNO;
2412 args->total = ap->total;
2413
2414 /*
2415 * Search for an allocation group with a single extent large enough
2416 * for the request. If one isn't found, then adjust the minimum
2417 * allocation size to the largest space found.
2418 */
2419 startag = ag = XFS_FSB_TO_AGNO(mp, args->fsbno);
2420 if (startag == NULLAGNUMBER)
2421 startag = ag = 0;
2422
2423 pag = xfs_perag_get(mp, ag);
2424 while (*blen < args->maxlen) {
2425 if (!pag->pagf_init) {
2426 error = xfs_alloc_pagf_init(mp, args->tp, ag,
2427 XFS_ALLOC_FLAG_TRYLOCK);
2428 if (error) {
2429 xfs_perag_put(pag);
2430 return error;
2431 }
2432 }
2433
2434 /*
2435 * See xfs_alloc_fix_freelist...
2436 */
2437 if (pag->pagf_init) {
2438 xfs_extlen_t longest;
2439 longest = xfs_alloc_longest_free_extent(mp, pag);
2440 if (*blen < longest)
2441 *blen = longest;
2442 } else
2443 notinit = 1;
2444
2445 if (xfs_inode_is_filestream(ap->ip)) {
2446 if (*blen >= args->maxlen)
2447 break;
2448
2449 if (ap->userdata) {
2450 /*
2451 * If startag is an invalid AG, we've
2452 * come here once before and
2453 * xfs_filestream_new_ag picked the
2454 * best currently available.
2455 *
2456 * Don't continue looping, since we
2457 * could loop forever.
2458 */
2459 if (startag == NULLAGNUMBER)
2460 break;
2461
2462 error = xfs_filestream_new_ag(ap, &ag);
2463 xfs_perag_put(pag);
2464 if (error)
2465 return error;
2466
2467 /* loop again to set 'blen'*/
2468 startag = NULLAGNUMBER;
2469 pag = xfs_perag_get(mp, ag);
2470 continue;
2471 }
2472 }
2473 if (++ag == mp->m_sb.sb_agcount)
2474 ag = 0;
2475 if (ag == startag)
2476 break;
2477 xfs_perag_put(pag);
2478 pag = xfs_perag_get(mp, ag);
2479 }
2480 xfs_perag_put(pag);
2481
2482 /*
2483 * Since the above loop did a BUF_TRYLOCK, it is
2484 * possible that there is space for this request.
2485 */
2486 if (notinit || *blen < ap->minlen)
2487 args->minlen = ap->minlen;
2488 /*
2489 * If the best seen length is less than the request
2490 * length, use the best as the minimum.
2491 */
2492 else if (*blen < args->maxlen)
2493 args->minlen = *blen;
2494 /*
2495 * Otherwise we've seen an extent as big as maxlen,
2496 * use that as the minimum.
2497 */
2498 else
2499 args->minlen = args->maxlen;
2500
2501 /*
2502 * set the failure fallback case to look in the selected
2503 * AG as the stream may have moved.
2504 */
2505 if (xfs_inode_is_filestream(ap->ip))
2506 ap->rval = args->fsbno = XFS_AGB_TO_FSB(mp, ag, 0);
2507
2508 return 0;
2509 }
2510
2511 STATIC int
2512 xfs_bmap_btalloc(
2513 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2514 {
2515 xfs_mount_t *mp; /* mount point structure */
2516 xfs_alloctype_t atype = 0; /* type for allocation routines */
2517 xfs_extlen_t align; /* minimum allocation alignment */
2518 xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
2519 xfs_agnumber_t ag;
2520 xfs_alloc_arg_t args;
2521 xfs_extlen_t blen;
2522 xfs_extlen_t nextminlen = 0;
2523 int nullfb; /* true if ap->firstblock isn't set */
2524 int isaligned;
2525 int tryagain;
2526 int error;
2527
2528 mp = ap->ip->i_mount;
2529 align = ap->userdata ? xfs_get_extsz_hint(ap->ip) : 0;
2530 if (unlikely(align)) {
2531 error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
2532 align, 0, ap->eof, 0, ap->conv,
2533 &ap->off, &ap->alen);
2534 ASSERT(!error);
2535 ASSERT(ap->alen);
2536 }
2537 nullfb = ap->firstblock == NULLFSBLOCK;
2538 fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
2539 if (nullfb) {
2540 if (ap->userdata && xfs_inode_is_filestream(ap->ip)) {
2541 ag = xfs_filestream_lookup_ag(ap->ip);
2542 ag = (ag != NULLAGNUMBER) ? ag : 0;
2543 ap->rval = XFS_AGB_TO_FSB(mp, ag, 0);
2544 } else {
2545 ap->rval = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
2546 }
2547 } else
2548 ap->rval = ap->firstblock;
2549
2550 xfs_bmap_adjacent(ap);
2551
2552 /*
2553 * If allowed, use ap->rval; otherwise must use firstblock since
2554 * it's in the right allocation group.
2555 */
2556 if (nullfb || XFS_FSB_TO_AGNO(mp, ap->rval) == fb_agno)
2557 ;
2558 else
2559 ap->rval = ap->firstblock;
2560 /*
2561 * Normal allocation, done through xfs_alloc_vextent.
2562 */
2563 tryagain = isaligned = 0;
2564 args.tp = ap->tp;
2565 args.mp = mp;
2566 args.fsbno = ap->rval;
2567
2568 /* Trim the allocation back to the maximum an AG can fit. */
2569 args.maxlen = MIN(ap->alen, XFS_ALLOC_AG_MAX_USABLE(mp));
2570 args.firstblock = ap->firstblock;
2571 blen = 0;
2572 if (nullfb) {
2573 error = xfs_bmap_btalloc_nullfb(ap, &args, &blen);
2574 if (error)
2575 return error;
2576 } else if (ap->low) {
2577 if (xfs_inode_is_filestream(ap->ip))
2578 args.type = XFS_ALLOCTYPE_FIRST_AG;
2579 else
2580 args.type = XFS_ALLOCTYPE_START_BNO;
2581 args.total = args.minlen = ap->minlen;
2582 } else {
2583 args.type = XFS_ALLOCTYPE_NEAR_BNO;
2584 args.total = ap->total;
2585 args.minlen = ap->minlen;
2586 }
2587 /* apply extent size hints if obtained earlier */
2588 if (unlikely(align)) {
2589 args.prod = align;
2590 if ((args.mod = (xfs_extlen_t)do_mod(ap->off, args.prod)))
2591 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2592 } else if (mp->m_sb.sb_blocksize >= PAGE_CACHE_SIZE) {
2593 args.prod = 1;
2594 args.mod = 0;
2595 } else {
2596 args.prod = PAGE_CACHE_SIZE >> mp->m_sb.sb_blocklog;
2597 if ((args.mod = (xfs_extlen_t)(do_mod(ap->off, args.prod))))
2598 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2599 }
2600 /*
2601 * If we are not low on available data blocks, and the
2602 * underlying logical volume manager is a stripe, and
2603 * the file offset is zero then try to allocate data
2604 * blocks on stripe unit boundary.
2605 * NOTE: ap->aeof is only set if the allocation length
2606 * is >= the stripe unit and the allocation offset is
2607 * at the end of file.
2608 */
2609 if (!ap->low && ap->aeof) {
2610 if (!ap->off) {
2611 args.alignment = mp->m_dalign;
2612 atype = args.type;
2613 isaligned = 1;
2614 /*
2615 * Adjust for alignment
2616 */
2617 if (blen > args.alignment && blen <= args.maxlen)
2618 args.minlen = blen - args.alignment;
2619 args.minalignslop = 0;
2620 } else {
2621 /*
2622 * First try an exact bno allocation.
2623 * If it fails then do a near or start bno
2624 * allocation with alignment turned on.
2625 */
2626 atype = args.type;
2627 tryagain = 1;
2628 args.type = XFS_ALLOCTYPE_THIS_BNO;
2629 args.alignment = 1;
2630 /*
2631 * Compute the minlen+alignment for the
2632 * next case. Set slop so that the value
2633 * of minlen+alignment+slop doesn't go up
2634 * between the calls.
2635 */
2636 if (blen > mp->m_dalign && blen <= args.maxlen)
2637 nextminlen = blen - mp->m_dalign;
2638 else
2639 nextminlen = args.minlen;
2640 if (nextminlen + mp->m_dalign > args.minlen + 1)
2641 args.minalignslop =
2642 nextminlen + mp->m_dalign -
2643 args.minlen - 1;
2644 else
2645 args.minalignslop = 0;
2646 }
2647 } else {
2648 args.alignment = 1;
2649 args.minalignslop = 0;
2650 }
2651 args.minleft = ap->minleft;
2652 args.wasdel = ap->wasdel;
2653 args.isfl = 0;
2654 args.userdata = ap->userdata;
2655 if ((error = xfs_alloc_vextent(&args)))
2656 return error;
2657 if (tryagain && args.fsbno == NULLFSBLOCK) {
2658 /*
2659 * Exact allocation failed. Now try with alignment
2660 * turned on.
2661 */
2662 args.type = atype;
2663 args.fsbno = ap->rval;
2664 args.alignment = mp->m_dalign;
2665 args.minlen = nextminlen;
2666 args.minalignslop = 0;
2667 isaligned = 1;
2668 if ((error = xfs_alloc_vextent(&args)))
2669 return error;
2670 }
2671 if (isaligned && args.fsbno == NULLFSBLOCK) {
2672 /*
2673 * allocation failed, so turn off alignment and
2674 * try again.
2675 */
2676 args.type = atype;
2677 args.fsbno = ap->rval;
2678 args.alignment = 0;
2679 if ((error = xfs_alloc_vextent(&args)))
2680 return error;
2681 }
2682 if (args.fsbno == NULLFSBLOCK && nullfb &&
2683 args.minlen > ap->minlen) {
2684 args.minlen = ap->minlen;
2685 args.type = XFS_ALLOCTYPE_START_BNO;
2686 args.fsbno = ap->rval;
2687 if ((error = xfs_alloc_vextent(&args)))
2688 return error;
2689 }
2690 if (args.fsbno == NULLFSBLOCK && nullfb) {
2691 args.fsbno = 0;
2692 args.type = XFS_ALLOCTYPE_FIRST_AG;
2693 args.total = ap->minlen;
2694 args.minleft = 0;
2695 if ((error = xfs_alloc_vextent(&args)))
2696 return error;
2697 ap->low = 1;
2698 }
2699 if (args.fsbno != NULLFSBLOCK) {
2700 ap->firstblock = ap->rval = args.fsbno;
2701 ASSERT(nullfb || fb_agno == args.agno ||
2702 (ap->low && fb_agno < args.agno));
2703 ap->alen = args.len;
2704 ap->ip->i_d.di_nblocks += args.len;
2705 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2706 if (ap->wasdel)
2707 ap->ip->i_delayed_blks -= args.len;
2708 /*
2709 * Adjust the disk quota also. This was reserved
2710 * earlier.
2711 */
2712 xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
2713 ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
2714 XFS_TRANS_DQ_BCOUNT,
2715 (long) args.len);
2716 } else {
2717 ap->rval = NULLFSBLOCK;
2718 ap->alen = 0;
2719 }
2720 return 0;
2721 }
2722
2723 /*
2724 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
2725 * It figures out where to ask the underlying allocator to put the new extent.
2726 */
2727 STATIC int
2728 xfs_bmap_alloc(
2729 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2730 {
2731 if (XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata)
2732 return xfs_bmap_rtalloc(ap);
2733 return xfs_bmap_btalloc(ap);
2734 }
2735
2736 /*
2737 * Transform a btree format file with only one leaf node, where the
2738 * extents list will fit in the inode, into an extents format file.
2739 * Since the file extents are already in-core, all we have to do is
2740 * give up the space for the btree root and pitch the leaf block.
2741 */
2742 STATIC int /* error */
2743 xfs_bmap_btree_to_extents(
2744 xfs_trans_t *tp, /* transaction pointer */
2745 xfs_inode_t *ip, /* incore inode pointer */
2746 xfs_btree_cur_t *cur, /* btree cursor */
2747 int *logflagsp, /* inode logging flags */
2748 int whichfork) /* data or attr fork */
2749 {
2750 /* REFERENCED */
2751 struct xfs_btree_block *cblock;/* child btree block */
2752 xfs_fsblock_t cbno; /* child block number */
2753 xfs_buf_t *cbp; /* child block's buffer */
2754 int error; /* error return value */
2755 xfs_ifork_t *ifp; /* inode fork data */
2756 xfs_mount_t *mp; /* mount point structure */
2757 __be64 *pp; /* ptr to block address */
2758 struct xfs_btree_block *rblock;/* root btree block */
2759
2760 mp = ip->i_mount;
2761 ifp = XFS_IFORK_PTR(ip, whichfork);
2762 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
2763 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
2764 rblock = ifp->if_broot;
2765 ASSERT(be16_to_cpu(rblock->bb_level) == 1);
2766 ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
2767 ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1);
2768 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes);
2769 cbno = be64_to_cpu(*pp);
2770 *logflagsp = 0;
2771 #ifdef DEBUG
2772 if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
2773 return error;
2774 #endif
2775 if ((error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp,
2776 XFS_BMAP_BTREE_REF)))
2777 return error;
2778 cblock = XFS_BUF_TO_BLOCK(cbp);
2779 if ((error = xfs_btree_check_block(cur, cblock, 0, cbp)))
2780 return error;
2781 xfs_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
2782 ip->i_d.di_nblocks--;
2783 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
2784 xfs_trans_binval(tp, cbp);
2785 if (cur->bc_bufs[0] == cbp)
2786 cur->bc_bufs[0] = NULL;
2787 xfs_iroot_realloc(ip, -1, whichfork);
2788 ASSERT(ifp->if_broot == NULL);
2789 ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
2790 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
2791 *logflagsp = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
2792 return 0;
2793 }
2794
2795 /*
2796 * Called by xfs_bmapi to update file extent records and the btree
2797 * after removing space (or undoing a delayed allocation).
2798 */
2799 STATIC int /* error */
2800 xfs_bmap_del_extent(
2801 xfs_inode_t *ip, /* incore inode pointer */
2802 xfs_trans_t *tp, /* current transaction pointer */
2803 xfs_extnum_t *idx, /* extent number to update/delete */
2804 xfs_bmap_free_t *flist, /* list of extents to be freed */
2805 xfs_btree_cur_t *cur, /* if null, not a btree */
2806 xfs_bmbt_irec_t *del, /* data to remove from extents */
2807 int *logflagsp, /* inode logging flags */
2808 int whichfork) /* data or attr fork */
2809 {
2810 xfs_filblks_t da_new; /* new delay-alloc indirect blocks */
2811 xfs_filblks_t da_old; /* old delay-alloc indirect blocks */
2812 xfs_fsblock_t del_endblock=0; /* first block past del */
2813 xfs_fileoff_t del_endoff; /* first offset past del */
2814 int delay; /* current block is delayed allocated */
2815 int do_fx; /* free extent at end of routine */
2816 xfs_bmbt_rec_host_t *ep; /* current extent entry pointer */
2817 int error; /* error return value */
2818 int flags; /* inode logging flags */
2819 xfs_bmbt_irec_t got; /* current extent entry */
2820 xfs_fileoff_t got_endoff; /* first offset past got */
2821 int i; /* temp state */
2822 xfs_ifork_t *ifp; /* inode fork pointer */
2823 xfs_mount_t *mp; /* mount structure */
2824 xfs_filblks_t nblks; /* quota/sb block count */
2825 xfs_bmbt_irec_t new; /* new record to be inserted */
2826 /* REFERENCED */
2827 uint qfield; /* quota field to update */
2828 xfs_filblks_t temp; /* for indirect length calculations */
2829 xfs_filblks_t temp2; /* for indirect length calculations */
2830 int state = 0;
2831
2832 XFS_STATS_INC(xs_del_exlist);
2833
2834 if (whichfork == XFS_ATTR_FORK)
2835 state |= BMAP_ATTRFORK;
2836
2837 mp = ip->i_mount;
2838 ifp = XFS_IFORK_PTR(ip, whichfork);
2839 ASSERT((*idx >= 0) && (*idx < ifp->if_bytes /
2840 (uint)sizeof(xfs_bmbt_rec_t)));
2841 ASSERT(del->br_blockcount > 0);
2842 ep = xfs_iext_get_ext(ifp, *idx);
2843 xfs_bmbt_get_all(ep, &got);
2844 ASSERT(got.br_startoff <= del->br_startoff);
2845 del_endoff = del->br_startoff + del->br_blockcount;
2846 got_endoff = got.br_startoff + got.br_blockcount;
2847 ASSERT(got_endoff >= del_endoff);
2848 delay = isnullstartblock(got.br_startblock);
2849 ASSERT(isnullstartblock(del->br_startblock) == delay);
2850 flags = 0;
2851 qfield = 0;
2852 error = 0;
2853 /*
2854 * If deleting a real allocation, must free up the disk space.
2855 */
2856 if (!delay) {
2857 flags = XFS_ILOG_CORE;
2858 /*
2859 * Realtime allocation. Free it and record di_nblocks update.
2860 */
2861 if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
2862 xfs_fsblock_t bno;
2863 xfs_filblks_t len;
2864
2865 ASSERT(do_mod(del->br_blockcount,
2866 mp->m_sb.sb_rextsize) == 0);
2867 ASSERT(do_mod(del->br_startblock,
2868 mp->m_sb.sb_rextsize) == 0);
2869 bno = del->br_startblock;
2870 len = del->br_blockcount;
2871 do_div(bno, mp->m_sb.sb_rextsize);
2872 do_div(len, mp->m_sb.sb_rextsize);
2873 error = xfs_rtfree_extent(tp, bno, (xfs_extlen_t)len);
2874 if (error)
2875 goto done;
2876 do_fx = 0;
2877 nblks = len * mp->m_sb.sb_rextsize;
2878 qfield = XFS_TRANS_DQ_RTBCOUNT;
2879 }
2880 /*
2881 * Ordinary allocation.
2882 */
2883 else {
2884 do_fx = 1;
2885 nblks = del->br_blockcount;
2886 qfield = XFS_TRANS_DQ_BCOUNT;
2887 }
2888 /*
2889 * Set up del_endblock and cur for later.
2890 */
2891 del_endblock = del->br_startblock + del->br_blockcount;
2892 if (cur) {
2893 if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
2894 got.br_startblock, got.br_blockcount,
2895 &i)))
2896 goto done;
2897 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2898 }
2899 da_old = da_new = 0;
2900 } else {
2901 da_old = startblockval(got.br_startblock);
2902 da_new = 0;
2903 nblks = 0;
2904 do_fx = 0;
2905 }
2906 /*
2907 * Set flag value to use in switch statement.
2908 * Left-contig is 2, right-contig is 1.
2909 */
2910 switch (((got.br_startoff == del->br_startoff) << 1) |
2911 (got_endoff == del_endoff)) {
2912 case 3:
2913 /*
2914 * Matches the whole extent. Delete the entry.
2915 */
2916 xfs_iext_remove(ip, *idx, 1,
2917 whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0);
2918 --*idx;
2919 if (delay)
2920 break;
2921
2922 XFS_IFORK_NEXT_SET(ip, whichfork,
2923 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
2924 flags |= XFS_ILOG_CORE;
2925 if (!cur) {
2926 flags |= xfs_ilog_fext(whichfork);
2927 break;
2928 }
2929 if ((error = xfs_btree_delete(cur, &i)))
2930 goto done;
2931 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2932 break;
2933
2934 case 2:
2935 /*
2936 * Deleting the first part of the extent.
2937 */
2938 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2939 xfs_bmbt_set_startoff(ep, del_endoff);
2940 temp = got.br_blockcount - del->br_blockcount;
2941 xfs_bmbt_set_blockcount(ep, temp);
2942 if (delay) {
2943 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2944 da_old);
2945 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
2946 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2947 da_new = temp;
2948 break;
2949 }
2950 xfs_bmbt_set_startblock(ep, del_endblock);
2951 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2952 if (!cur) {
2953 flags |= xfs_ilog_fext(whichfork);
2954 break;
2955 }
2956 if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
2957 got.br_blockcount - del->br_blockcount,
2958 got.br_state)))
2959 goto done;
2960 break;
2961
2962 case 1:
2963 /*
2964 * Deleting the last part of the extent.
2965 */
2966 temp = got.br_blockcount - del->br_blockcount;
2967 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2968 xfs_bmbt_set_blockcount(ep, temp);
2969 if (delay) {
2970 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2971 da_old);
2972 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
2973 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2974 da_new = temp;
2975 break;
2976 }
2977 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2978 if (!cur) {
2979 flags |= xfs_ilog_fext(whichfork);
2980 break;
2981 }
2982 if ((error = xfs_bmbt_update(cur, got.br_startoff,
2983 got.br_startblock,
2984 got.br_blockcount - del->br_blockcount,
2985 got.br_state)))
2986 goto done;
2987 break;
2988
2989 case 0:
2990 /*
2991 * Deleting the middle of the extent.
2992 */
2993 temp = del->br_startoff - got.br_startoff;
2994 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2995 xfs_bmbt_set_blockcount(ep, temp);
2996 new.br_startoff = del_endoff;
2997 temp2 = got_endoff - del_endoff;
2998 new.br_blockcount = temp2;
2999 new.br_state = got.br_state;
3000 if (!delay) {
3001 new.br_startblock = del_endblock;
3002 flags |= XFS_ILOG_CORE;
3003 if (cur) {
3004 if ((error = xfs_bmbt_update(cur,
3005 got.br_startoff,
3006 got.br_startblock, temp,
3007 got.br_state)))
3008 goto done;
3009 if ((error = xfs_btree_increment(cur, 0, &i)))
3010 goto done;
3011 cur->bc_rec.b = new;
3012 error = xfs_btree_insert(cur, &i);
3013 if (error && error != ENOSPC)
3014 goto done;
3015 /*
3016 * If get no-space back from btree insert,
3017 * it tried a split, and we have a zero
3018 * block reservation.
3019 * Fix up our state and return the error.
3020 */
3021 if (error == ENOSPC) {
3022 /*
3023 * Reset the cursor, don't trust
3024 * it after any insert operation.
3025 */
3026 if ((error = xfs_bmbt_lookup_eq(cur,
3027 got.br_startoff,
3028 got.br_startblock,
3029 temp, &i)))
3030 goto done;
3031 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
3032 /*
3033 * Update the btree record back
3034 * to the original value.
3035 */
3036 if ((error = xfs_bmbt_update(cur,
3037 got.br_startoff,
3038 got.br_startblock,
3039 got.br_blockcount,
3040 got.br_state)))
3041 goto done;
3042 /*
3043 * Reset the extent record back
3044 * to the original value.
3045 */
3046 xfs_bmbt_set_blockcount(ep,
3047 got.br_blockcount);
3048 flags = 0;
3049 error = XFS_ERROR(ENOSPC);
3050 goto done;
3051 }
3052 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
3053 } else
3054 flags |= xfs_ilog_fext(whichfork);
3055 XFS_IFORK_NEXT_SET(ip, whichfork,
3056 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
3057 } else {
3058 ASSERT(whichfork == XFS_DATA_FORK);
3059 temp = xfs_bmap_worst_indlen(ip, temp);
3060 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
3061 temp2 = xfs_bmap_worst_indlen(ip, temp2);
3062 new.br_startblock = nullstartblock((int)temp2);
3063 da_new = temp + temp2;
3064 while (da_new > da_old) {
3065 if (temp) {
3066 temp--;
3067 da_new--;
3068 xfs_bmbt_set_startblock(ep,
3069 nullstartblock((int)temp));
3070 }
3071 if (da_new == da_old)
3072 break;
3073 if (temp2) {
3074 temp2--;
3075 da_new--;
3076 new.br_startblock =
3077 nullstartblock((int)temp2);
3078 }
3079 }
3080 }
3081 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
3082 xfs_iext_insert(ip, *idx + 1, 1, &new, state);
3083 ++*idx;
3084 break;
3085 }
3086 /*
3087 * If we need to, add to list of extents to delete.
3088 */
3089 if (do_fx)
3090 xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
3091 mp);
3092 /*
3093 * Adjust inode # blocks in the file.
3094 */
3095 if (nblks)
3096 ip->i_d.di_nblocks -= nblks;
3097 /*
3098 * Adjust quota data.
3099 */
3100 if (qfield)
3101 xfs_trans_mod_dquot_byino(tp, ip, qfield, (long)-nblks);
3102
3103 /*
3104 * Account for change in delayed indirect blocks.
3105 * Nothing to do for disk quota accounting here.
3106 */
3107 ASSERT(da_old >= da_new);
3108 if (da_old > da_new) {
3109 xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
3110 (int64_t)(da_old - da_new), 0);
3111 }
3112 done:
3113 *logflagsp = flags;
3114 return error;
3115 }
3116
3117 /*
3118 * Remove the entry "free" from the free item list. Prev points to the
3119 * previous entry, unless "free" is the head of the list.
3120 */
3121 STATIC void
3122 xfs_bmap_del_free(
3123 xfs_bmap_free_t *flist, /* free item list header */
3124 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
3125 xfs_bmap_free_item_t *free) /* list item to be freed */
3126 {
3127 if (prev)
3128 prev->xbfi_next = free->xbfi_next;
3129 else
3130 flist->xbf_first = free->xbfi_next;
3131 flist->xbf_count--;
3132 kmem_zone_free(xfs_bmap_free_item_zone, free);
3133 }
3134
3135 /*
3136 * Convert an extents-format file into a btree-format file.
3137 * The new file will have a root block (in the inode) and a single child block.
3138 */
3139 STATIC int /* error */
3140 xfs_bmap_extents_to_btree(
3141 xfs_trans_t *tp, /* transaction pointer */
3142 xfs_inode_t *ip, /* incore inode pointer */
3143 xfs_fsblock_t *firstblock, /* first-block-allocated */
3144 xfs_bmap_free_t *flist, /* blocks freed in xaction */
3145 xfs_btree_cur_t **curp, /* cursor returned to caller */
3146 int wasdel, /* converting a delayed alloc */
3147 int *logflagsp, /* inode logging flags */
3148 int whichfork) /* data or attr fork */
3149 {
3150 struct xfs_btree_block *ablock; /* allocated (child) bt block */
3151 xfs_buf_t *abp; /* buffer for ablock */
3152 xfs_alloc_arg_t args; /* allocation arguments */
3153 xfs_bmbt_rec_t *arp; /* child record pointer */
3154 struct xfs_btree_block *block; /* btree root block */
3155 xfs_btree_cur_t *cur; /* bmap btree cursor */
3156 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3157 int error; /* error return value */
3158 xfs_extnum_t i, cnt; /* extent record index */
3159 xfs_ifork_t *ifp; /* inode fork pointer */
3160 xfs_bmbt_key_t *kp; /* root block key pointer */
3161 xfs_mount_t *mp; /* mount structure */
3162 xfs_extnum_t nextents; /* number of file extents */
3163 xfs_bmbt_ptr_t *pp; /* root block address pointer */
3164
3165 ifp = XFS_IFORK_PTR(ip, whichfork);
3166 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
3167 ASSERT(ifp->if_ext_max ==
3168 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
3169 /*
3170 * Make space in the inode incore.
3171 */
3172 xfs_iroot_realloc(ip, 1, whichfork);
3173 ifp->if_flags |= XFS_IFBROOT;
3174
3175 /*
3176 * Fill in the root.
3177 */
3178 block = ifp->if_broot;
3179 block->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3180 block->bb_level = cpu_to_be16(1);
3181 block->bb_numrecs = cpu_to_be16(1);
3182 block->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
3183 block->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
3184
3185 /*
3186 * Need a cursor. Can't allocate until bb_level is filled in.
3187 */
3188 mp = ip->i_mount;
3189 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
3190 cur->bc_private.b.firstblock = *firstblock;
3191 cur->bc_private.b.flist = flist;
3192 cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
3193 /*
3194 * Convert to a btree with two levels, one record in root.
3195 */
3196 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
3197 args.tp = tp;
3198 args.mp = mp;
3199 args.firstblock = *firstblock;
3200 if (*firstblock == NULLFSBLOCK) {
3201 args.type = XFS_ALLOCTYPE_START_BNO;
3202 args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
3203 } else if (flist->xbf_low) {
3204 args.type = XFS_ALLOCTYPE_START_BNO;
3205 args.fsbno = *firstblock;
3206 } else {
3207 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3208 args.fsbno = *firstblock;
3209 }
3210 args.minlen = args.maxlen = args.prod = 1;
3211 args.total = args.minleft = args.alignment = args.mod = args.isfl =
3212 args.minalignslop = 0;
3213 args.wasdel = wasdel;
3214 *logflagsp = 0;
3215 if ((error = xfs_alloc_vextent(&args))) {
3216 xfs_iroot_realloc(ip, -1, whichfork);
3217 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
3218 return error;
3219 }
3220 /*
3221 * Allocation can't fail, the space was reserved.
3222 */
3223 ASSERT(args.fsbno != NULLFSBLOCK);
3224 ASSERT(*firstblock == NULLFSBLOCK ||
3225 args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) ||
3226 (flist->xbf_low &&
3227 args.agno > XFS_FSB_TO_AGNO(mp, *firstblock)));
3228 *firstblock = cur->bc_private.b.firstblock = args.fsbno;
3229 cur->bc_private.b.allocated++;
3230 ip->i_d.di_nblocks++;
3231 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
3232 abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
3233 /*
3234 * Fill in the child block.
3235 */
3236 ablock = XFS_BUF_TO_BLOCK(abp);
3237 ablock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3238 ablock->bb_level = 0;
3239 ablock->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
3240 ablock->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
3241 arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
3242 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3243 for (cnt = i = 0; i < nextents; i++) {
3244 ep = xfs_iext_get_ext(ifp, i);
3245 if (!isnullstartblock(xfs_bmbt_get_startblock(ep))) {
3246 arp->l0 = cpu_to_be64(ep->l0);
3247 arp->l1 = cpu_to_be64(ep->l1);
3248 arp++; cnt++;
3249 }
3250 }
3251 ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
3252 xfs_btree_set_numrecs(ablock, cnt);
3253
3254 /*
3255 * Fill in the root key and pointer.
3256 */
3257 kp = XFS_BMBT_KEY_ADDR(mp, block, 1);
3258 arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
3259 kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
3260 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur,
3261 be16_to_cpu(block->bb_level)));
3262 *pp = cpu_to_be64(args.fsbno);
3263
3264 /*
3265 * Do all this logging at the end so that
3266 * the root is at the right level.
3267 */
3268 xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS);
3269 xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
3270 ASSERT(*curp == NULL);
3271 *curp = cur;
3272 *logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork);
3273 return 0;
3274 }
3275
3276 /*
3277 * Calculate the default attribute fork offset for newly created inodes.
3278 */
3279 uint
3280 xfs_default_attroffset(
3281 struct xfs_inode *ip)
3282 {
3283 struct xfs_mount *mp = ip->i_mount;
3284 uint offset;
3285
3286 if (mp->m_sb.sb_inodesize == 256) {
3287 offset = XFS_LITINO(mp) -
3288 XFS_BMDR_SPACE_CALC(MINABTPTRS);
3289 } else {
3290 offset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
3291 }
3292
3293 ASSERT(offset < XFS_LITINO(mp));
3294 return offset;
3295 }
3296
3297 /*
3298 * Helper routine to reset inode di_forkoff field when switching
3299 * attribute fork from local to extent format - we reset it where
3300 * possible to make space available for inline data fork extents.
3301 */
3302 STATIC void
3303 xfs_bmap_forkoff_reset(
3304 xfs_mount_t *mp,
3305 xfs_inode_t *ip,
3306 int whichfork)
3307 {
3308 if (whichfork == XFS_ATTR_FORK &&
3309 ip->i_d.di_format != XFS_DINODE_FMT_DEV &&
3310 ip->i_d.di_format != XFS_DINODE_FMT_UUID &&
3311 ip->i_d.di_format != XFS_DINODE_FMT_BTREE) {
3312 uint dfl_forkoff = xfs_default_attroffset(ip) >> 3;
3313
3314 if (dfl_forkoff > ip->i_d.di_forkoff) {
3315 ip->i_d.di_forkoff = dfl_forkoff;
3316 ip->i_df.if_ext_max =
3317 XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t);
3318 ip->i_afp->if_ext_max =
3319 XFS_IFORK_ASIZE(ip) / sizeof(xfs_bmbt_rec_t);
3320 }
3321 }
3322 }
3323
3324 /*
3325 * Convert a local file to an extents file.
3326 * This code is out of bounds for data forks of regular files,
3327 * since the file data needs to get logged so things will stay consistent.
3328 * (The bmap-level manipulations are ok, though).
3329 */
3330 STATIC int /* error */
3331 xfs_bmap_local_to_extents(
3332 xfs_trans_t *tp, /* transaction pointer */
3333 xfs_inode_t *ip, /* incore inode pointer */
3334 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
3335 xfs_extlen_t total, /* total blocks needed by transaction */
3336 int *logflagsp, /* inode logging flags */
3337 int whichfork) /* data or attr fork */
3338 {
3339 int error; /* error return value */
3340 int flags; /* logging flags returned */
3341 xfs_ifork_t *ifp; /* inode fork pointer */
3342
3343 /*
3344 * We don't want to deal with the case of keeping inode data inline yet.
3345 * So sending the data fork of a regular inode is invalid.
3346 */
3347 ASSERT(!(S_ISREG(ip->i_d.di_mode) && whichfork == XFS_DATA_FORK));
3348 ifp = XFS_IFORK_PTR(ip, whichfork);
3349 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
3350 flags = 0;
3351 error = 0;
3352 if (ifp->if_bytes) {
3353 xfs_alloc_arg_t args; /* allocation arguments */
3354 xfs_buf_t *bp; /* buffer for extent block */
3355 xfs_bmbt_rec_host_t *ep;/* extent record pointer */
3356
3357 args.tp = tp;
3358 args.mp = ip->i_mount;
3359 args.firstblock = *firstblock;
3360 ASSERT((ifp->if_flags &
3361 (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) == XFS_IFINLINE);
3362 /*
3363 * Allocate a block. We know we need only one, since the
3364 * file currently fits in an inode.
3365 */
3366 if (*firstblock == NULLFSBLOCK) {
3367 args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
3368 args.type = XFS_ALLOCTYPE_START_BNO;
3369 } else {
3370 args.fsbno = *firstblock;
3371 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3372 }
3373 args.total = total;
3374 args.mod = args.minleft = args.alignment = args.wasdel =
3375 args.isfl = args.minalignslop = 0;
3376 args.minlen = args.maxlen = args.prod = 1;
3377 if ((error = xfs_alloc_vextent(&args)))
3378 goto done;
3379 /*
3380 * Can't fail, the space was reserved.
3381 */
3382 ASSERT(args.fsbno != NULLFSBLOCK);
3383 ASSERT(args.len == 1);
3384 *firstblock = args.fsbno;
3385 bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
3386 memcpy(bp->b_addr, ifp->if_u1.if_data, ifp->if_bytes);
3387 xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
3388 xfs_bmap_forkoff_reset(args.mp, ip, whichfork);
3389 xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
3390 xfs_iext_add(ifp, 0, 1);
3391 ep = xfs_iext_get_ext(ifp, 0);
3392 xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
3393 trace_xfs_bmap_post_update(ip, 0,
3394 whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0,
3395 _THIS_IP_);
3396 XFS_IFORK_NEXT_SET(ip, whichfork, 1);
3397 ip->i_d.di_nblocks = 1;
3398 xfs_trans_mod_dquot_byino(tp, ip,
3399 XFS_TRANS_DQ_BCOUNT, 1L);
3400 flags |= xfs_ilog_fext(whichfork);
3401 } else {
3402 ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
3403 xfs_bmap_forkoff_reset(ip->i_mount, ip, whichfork);
3404 }
3405 ifp->if_flags &= ~XFS_IFINLINE;
3406 ifp->if_flags |= XFS_IFEXTENTS;
3407 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
3408 flags |= XFS_ILOG_CORE;
3409 done:
3410 *logflagsp = flags;
3411 return error;
3412 }
3413
3414 /*
3415 * Search the extent records for the entry containing block bno.
3416 * If bno lies in a hole, point to the next entry. If bno lies
3417 * past eof, *eofp will be set, and *prevp will contain the last
3418 * entry (null if none). Else, *lastxp will be set to the index
3419 * of the found entry; *gotp will contain the entry.
3420 */
3421 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
3422 xfs_bmap_search_multi_extents(
3423 xfs_ifork_t *ifp, /* inode fork pointer */
3424 xfs_fileoff_t bno, /* block number searched for */
3425 int *eofp, /* out: end of file found */
3426 xfs_extnum_t *lastxp, /* out: last extent index */
3427 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3428 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3429 {
3430 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3431 xfs_extnum_t lastx; /* last extent index */
3432
3433 /*
3434 * Initialize the extent entry structure to catch access to
3435 * uninitialized br_startblock field.
3436 */
3437 gotp->br_startoff = 0xffa5a5a5a5a5a5a5LL;
3438 gotp->br_blockcount = 0xa55a5a5a5a5a5a5aLL;
3439 gotp->br_state = XFS_EXT_INVALID;
3440 #if XFS_BIG_BLKNOS
3441 gotp->br_startblock = 0xffffa5a5a5a5a5a5LL;
3442 #else
3443 gotp->br_startblock = 0xffffa5a5;
3444 #endif
3445 prevp->br_startoff = NULLFILEOFF;
3446
3447 ep = xfs_iext_bno_to_ext(ifp, bno, &lastx);
3448 if (lastx > 0) {
3449 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx - 1), prevp);
3450 }
3451 if (lastx < (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
3452 xfs_bmbt_get_all(ep, gotp);
3453 *eofp = 0;
3454 } else {
3455 if (lastx > 0) {
3456 *gotp = *prevp;
3457 }
3458 *eofp = 1;
3459 ep = NULL;
3460 }
3461 *lastxp = lastx;
3462 return ep;
3463 }
3464
3465 /*
3466 * Search the extents list for the inode, for the extent containing bno.
3467 * If bno lies in a hole, point to the next entry. If bno lies past eof,
3468 * *eofp will be set, and *prevp will contain the last entry (null if none).
3469 * Else, *lastxp will be set to the index of the found
3470 * entry; *gotp will contain the entry.
3471 */
3472 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
3473 xfs_bmap_search_extents(
3474 xfs_inode_t *ip, /* incore inode pointer */
3475 xfs_fileoff_t bno, /* block number searched for */
3476 int fork, /* data or attr fork */
3477 int *eofp, /* out: end of file found */
3478 xfs_extnum_t *lastxp, /* out: last extent index */
3479 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3480 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3481 {
3482 xfs_ifork_t *ifp; /* inode fork pointer */
3483 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3484
3485 XFS_STATS_INC(xs_look_exlist);
3486 ifp = XFS_IFORK_PTR(ip, fork);
3487
3488 ep = xfs_bmap_search_multi_extents(ifp, bno, eofp, lastxp, gotp, prevp);
3489
3490 if (unlikely(!(gotp->br_startblock) && (*lastxp != NULLEXTNUM) &&
3491 !(XFS_IS_REALTIME_INODE(ip) && fork == XFS_DATA_FORK))) {
3492 xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO,
3493 "Access to block zero in inode %llu "
3494 "start_block: %llx start_off: %llx "
3495 "blkcnt: %llx extent-state: %x lastx: %x\n",
3496 (unsigned long long)ip->i_ino,
3497 (unsigned long long)gotp->br_startblock,
3498 (unsigned long long)gotp->br_startoff,
3499 (unsigned long long)gotp->br_blockcount,
3500 gotp->br_state, *lastxp);
3501 *lastxp = NULLEXTNUM;
3502 *eofp = 1;
3503 return NULL;
3504 }
3505 return ep;
3506 }
3507
3508 /*
3509 * Compute the worst-case number of indirect blocks that will be used
3510 * for ip's delayed extent of length "len".
3511 */
3512 STATIC xfs_filblks_t
3513 xfs_bmap_worst_indlen(
3514 xfs_inode_t *ip, /* incore inode pointer */
3515 xfs_filblks_t len) /* delayed extent length */
3516 {
3517 int level; /* btree level number */
3518 int maxrecs; /* maximum record count at this level */
3519 xfs_mount_t *mp; /* mount structure */
3520 xfs_filblks_t rval; /* return value */
3521
3522 mp = ip->i_mount;
3523 maxrecs = mp->m_bmap_dmxr[0];
3524 for (level = 0, rval = 0;
3525 level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
3526 level++) {
3527 len += maxrecs - 1;
3528 do_div(len, maxrecs);
3529 rval += len;
3530 if (len == 1)
3531 return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
3532 level - 1;
3533 if (level == 0)
3534 maxrecs = mp->m_bmap_dmxr[1];
3535 }
3536 return rval;
3537 }
3538
3539 /*
3540 * Convert inode from non-attributed to attributed.
3541 * Must not be in a transaction, ip must not be locked.
3542 */
3543 int /* error code */
3544 xfs_bmap_add_attrfork(
3545 xfs_inode_t *ip, /* incore inode pointer */
3546 int size, /* space new attribute needs */
3547 int rsvd) /* xact may use reserved blks */
3548 {
3549 xfs_fsblock_t firstblock; /* 1st block/ag allocated */
3550 xfs_bmap_free_t flist; /* freed extent records */
3551 xfs_mount_t *mp; /* mount structure */
3552 xfs_trans_t *tp; /* transaction pointer */
3553 int blks; /* space reservation */
3554 int version = 1; /* superblock attr version */
3555 int committed; /* xaction was committed */
3556 int logflags; /* logging flags */
3557 int error; /* error return value */
3558
3559 ASSERT(XFS_IFORK_Q(ip) == 0);
3560 ASSERT(ip->i_df.if_ext_max ==
3561 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3562
3563 mp = ip->i_mount;
3564 ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
3565 tp = xfs_trans_alloc(mp, XFS_TRANS_ADDAFORK);
3566 blks = XFS_ADDAFORK_SPACE_RES(mp);
3567 if (rsvd)
3568 tp->t_flags |= XFS_TRANS_RESERVE;
3569 if ((error = xfs_trans_reserve(tp, blks, XFS_ADDAFORK_LOG_RES(mp), 0,
3570 XFS_TRANS_PERM_LOG_RES, XFS_ADDAFORK_LOG_COUNT)))
3571 goto error0;
3572 xfs_ilock(ip, XFS_ILOCK_EXCL);
3573 error = xfs_trans_reserve_quota_nblks(tp, ip, blks, 0, rsvd ?
3574 XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
3575 XFS_QMOPT_RES_REGBLKS);
3576 if (error) {
3577 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3578 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
3579 return error;
3580 }
3581 if (XFS_IFORK_Q(ip))
3582 goto error1;
3583 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
3584 /*
3585 * For inodes coming from pre-6.2 filesystems.
3586 */
3587 ASSERT(ip->i_d.di_aformat == 0);
3588 ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
3589 }
3590 ASSERT(ip->i_d.di_anextents == 0);
3591
3592 xfs_trans_ijoin_ref(tp, ip, XFS_ILOCK_EXCL);
3593 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
3594
3595 switch (ip->i_d.di_format) {
3596 case XFS_DINODE_FMT_DEV:
3597 ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
3598 break;
3599 case XFS_DINODE_FMT_UUID:
3600 ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
3601 break;
3602 case XFS_DINODE_FMT_LOCAL:
3603 case XFS_DINODE_FMT_EXTENTS:
3604 case XFS_DINODE_FMT_BTREE:
3605 ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
3606 if (!ip->i_d.di_forkoff)
3607 ip->i_d.di_forkoff = xfs_default_attroffset(ip) >> 3;
3608 else if (mp->m_flags & XFS_MOUNT_ATTR2)
3609 version = 2;
3610 break;
3611 default:
3612 ASSERT(0);
3613 error = XFS_ERROR(EINVAL);
3614 goto error1;
3615 }
3616 ip->i_df.if_ext_max =
3617 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
3618 ASSERT(ip->i_afp == NULL);
3619 ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
3620 ip->i_afp->if_ext_max =
3621 XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
3622 ip->i_afp->if_flags = XFS_IFEXTENTS;
3623 logflags = 0;
3624 xfs_bmap_init(&flist, &firstblock);
3625 switch (ip->i_d.di_format) {
3626 case XFS_DINODE_FMT_LOCAL:
3627 error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &flist,
3628 &logflags);
3629 break;
3630 case XFS_DINODE_FMT_EXTENTS:
3631 error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
3632 &flist, &logflags);
3633 break;
3634 case XFS_DINODE_FMT_BTREE:
3635 error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &flist,
3636 &logflags);
3637 break;
3638 default:
3639 error = 0;
3640 break;
3641 }
3642 if (logflags)
3643 xfs_trans_log_inode(tp, ip, logflags);
3644 if (error)
3645 goto error2;
3646 if (!xfs_sb_version_hasattr(&mp->m_sb) ||
3647 (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2)) {
3648 __int64_t sbfields = 0;
3649
3650 spin_lock(&mp->m_sb_lock);
3651 if (!xfs_sb_version_hasattr(&mp->m_sb)) {
3652 xfs_sb_version_addattr(&mp->m_sb);
3653 sbfields |= XFS_SB_VERSIONNUM;
3654 }
3655 if (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2) {
3656 xfs_sb_version_addattr2(&mp->m_sb);
3657 sbfields |= (XFS_SB_VERSIONNUM | XFS_SB_FEATURES2);
3658 }
3659 if (sbfields) {
3660 spin_unlock(&mp->m_sb_lock);
3661 xfs_mod_sb(tp, sbfields);
3662 } else
3663 spin_unlock(&mp->m_sb_lock);
3664 }
3665 if ((error = xfs_bmap_finish(&tp, &flist, &committed)))
3666 goto error2;
3667 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
3668 ASSERT(ip->i_df.if_ext_max ==
3669 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3670 return error;
3671 error2:
3672 xfs_bmap_cancel(&flist);
3673 error1:
3674 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3675 error0:
3676 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
3677 ASSERT(ip->i_df.if_ext_max ==
3678 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3679 return error;
3680 }
3681
3682 /*
3683 * Add the extent to the list of extents to be free at transaction end.
3684 * The list is maintained sorted (by block number).
3685 */
3686 /* ARGSUSED */
3687 void
3688 xfs_bmap_add_free(
3689 xfs_fsblock_t bno, /* fs block number of extent */
3690 xfs_filblks_t len, /* length of extent */
3691 xfs_bmap_free_t *flist, /* list of extents */
3692 xfs_mount_t *mp) /* mount point structure */
3693 {
3694 xfs_bmap_free_item_t *cur; /* current (next) element */
3695 xfs_bmap_free_item_t *new; /* new element */
3696 xfs_bmap_free_item_t *prev; /* previous element */
3697 #ifdef DEBUG
3698 xfs_agnumber_t agno;
3699 xfs_agblock_t agbno;
3700
3701 ASSERT(bno != NULLFSBLOCK);
3702 ASSERT(len > 0);
3703 ASSERT(len <= MAXEXTLEN);
3704 ASSERT(!isnullstartblock(bno));
3705 agno = XFS_FSB_TO_AGNO(mp, bno);
3706 agbno = XFS_FSB_TO_AGBNO(mp, bno);
3707 ASSERT(agno < mp->m_sb.sb_agcount);
3708 ASSERT(agbno < mp->m_sb.sb_agblocks);
3709 ASSERT(len < mp->m_sb.sb_agblocks);
3710 ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
3711 #endif
3712 ASSERT(xfs_bmap_free_item_zone != NULL);
3713 new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
3714 new->xbfi_startblock = bno;
3715 new->xbfi_blockcount = (xfs_extlen_t)len;
3716 for (prev = NULL, cur = flist->xbf_first;
3717 cur != NULL;
3718 prev = cur, cur = cur->xbfi_next) {
3719 if (cur->xbfi_startblock >= bno)
3720 break;
3721 }
3722 if (prev)
3723 prev->xbfi_next = new;
3724 else
3725 flist->xbf_first = new;
3726 new->xbfi_next = cur;
3727 flist->xbf_count++;
3728 }
3729
3730 /*
3731 * Compute and fill in the value of the maximum depth of a bmap btree
3732 * in this filesystem. Done once, during mount.
3733 */
3734 void
3735 xfs_bmap_compute_maxlevels(
3736 xfs_mount_t *mp, /* file system mount structure */
3737 int whichfork) /* data or attr fork */
3738 {
3739 int level; /* btree level */
3740 uint maxblocks; /* max blocks at this level */
3741 uint maxleafents; /* max leaf entries possible */
3742 int maxrootrecs; /* max records in root block */
3743 int minleafrecs; /* min records in leaf block */
3744 int minnoderecs; /* min records in node block */
3745 int sz; /* root block size */
3746
3747 /*
3748 * The maximum number of extents in a file, hence the maximum
3749 * number of leaf entries, is controlled by the type of di_nextents
3750 * (a signed 32-bit number, xfs_extnum_t), or by di_anextents
3751 * (a signed 16-bit number, xfs_aextnum_t).
3752 *
3753 * Note that we can no longer assume that if we are in ATTR1 that
3754 * the fork offset of all the inodes will be
3755 * (xfs_default_attroffset(ip) >> 3) because we could have mounted
3756 * with ATTR2 and then mounted back with ATTR1, keeping the
3757 * di_forkoff's fixed but probably at various positions. Therefore,
3758 * for both ATTR1 and ATTR2 we have to assume the worst case scenario
3759 * of a minimum size available.
3760 */
3761 if (whichfork == XFS_DATA_FORK) {
3762 maxleafents = MAXEXTNUM;
3763 sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
3764 } else {
3765 maxleafents = MAXAEXTNUM;
3766 sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
3767 }
3768 maxrootrecs = xfs_bmdr_maxrecs(mp, sz, 0);
3769 minleafrecs = mp->m_bmap_dmnr[0];
3770 minnoderecs = mp->m_bmap_dmnr[1];
3771 maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
3772 for (level = 1; maxblocks > 1; level++) {
3773 if (maxblocks <= maxrootrecs)
3774 maxblocks = 1;
3775 else
3776 maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
3777 }
3778 mp->m_bm_maxlevels[whichfork] = level;
3779 }
3780
3781 /*
3782 * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
3783 * caller. Frees all the extents that need freeing, which must be done
3784 * last due to locking considerations. We never free any extents in
3785 * the first transaction.
3786 *
3787 * Return 1 if the given transaction was committed and a new one
3788 * started, and 0 otherwise in the committed parameter.
3789 */
3790 int /* error */
3791 xfs_bmap_finish(
3792 xfs_trans_t **tp, /* transaction pointer addr */
3793 xfs_bmap_free_t *flist, /* i/o: list extents to free */
3794 int *committed) /* xact committed or not */
3795 {
3796 xfs_efd_log_item_t *efd; /* extent free data */
3797 xfs_efi_log_item_t *efi; /* extent free intention */
3798 int error; /* error return value */
3799 xfs_bmap_free_item_t *free; /* free extent item */
3800 unsigned int logres; /* new log reservation */
3801 unsigned int logcount; /* new log count */
3802 xfs_mount_t *mp; /* filesystem mount structure */
3803 xfs_bmap_free_item_t *next; /* next item on free list */
3804 xfs_trans_t *ntp; /* new transaction pointer */
3805
3806 ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
3807 if (flist->xbf_count == 0) {
3808 *committed = 0;
3809 return 0;
3810 }
3811 ntp = *tp;
3812 efi = xfs_trans_get_efi(ntp, flist->xbf_count);
3813 for (free = flist->xbf_first; free; free = free->xbfi_next)
3814 xfs_trans_log_efi_extent(ntp, efi, free->xbfi_startblock,
3815 free->xbfi_blockcount);
3816 logres = ntp->t_log_res;
3817 logcount = ntp->t_log_count;
3818 ntp = xfs_trans_dup(*tp);
3819 error = xfs_trans_commit(*tp, 0);
3820 *tp = ntp;
3821 *committed = 1;
3822 /*
3823 * We have a new transaction, so we should return committed=1,
3824 * even though we're returning an error.
3825 */
3826 if (error)
3827 return error;
3828
3829 /*
3830 * transaction commit worked ok so we can drop the extra ticket
3831 * reference that we gained in xfs_trans_dup()
3832 */
3833 xfs_log_ticket_put(ntp->t_ticket);
3834
3835 if ((error = xfs_trans_reserve(ntp, 0, logres, 0, XFS_TRANS_PERM_LOG_RES,
3836 logcount)))
3837 return error;
3838 efd = xfs_trans_get_efd(ntp, efi, flist->xbf_count);
3839 for (free = flist->xbf_first; free != NULL; free = next) {
3840 next = free->xbfi_next;
3841 if ((error = xfs_free_extent(ntp, free->xbfi_startblock,
3842 free->xbfi_blockcount))) {
3843 /*
3844 * The bmap free list will be cleaned up at a
3845 * higher level. The EFI will be canceled when
3846 * this transaction is aborted.
3847 * Need to force shutdown here to make sure it
3848 * happens, since this transaction may not be
3849 * dirty yet.
3850 */
3851 mp = ntp->t_mountp;
3852 if (!XFS_FORCED_SHUTDOWN(mp))
3853 xfs_force_shutdown(mp,
3854 (error == EFSCORRUPTED) ?
3855 SHUTDOWN_CORRUPT_INCORE :
3856 SHUTDOWN_META_IO_ERROR);
3857 return error;
3858 }
3859 xfs_trans_log_efd_extent(ntp, efd, free->xbfi_startblock,
3860 free->xbfi_blockcount);
3861 xfs_bmap_del_free(flist, NULL, free);
3862 }
3863 return 0;
3864 }
3865
3866 /*
3867 * Free up any items left in the list.
3868 */
3869 void
3870 xfs_bmap_cancel(
3871 xfs_bmap_free_t *flist) /* list of bmap_free_items */
3872 {
3873 xfs_bmap_free_item_t *free; /* free list item */
3874 xfs_bmap_free_item_t *next;
3875
3876 if (flist->xbf_count == 0)
3877 return;
3878 ASSERT(flist->xbf_first != NULL);
3879 for (free = flist->xbf_first; free; free = next) {
3880 next = free->xbfi_next;
3881 xfs_bmap_del_free(flist, NULL, free);
3882 }
3883 ASSERT(flist->xbf_count == 0);
3884 }
3885
3886 /*
3887 * Returns the file-relative block number of the first unused block(s)
3888 * in the file with at least "len" logically contiguous blocks free.
3889 * This is the lowest-address hole if the file has holes, else the first block
3890 * past the end of file.
3891 * Return 0 if the file is currently local (in-inode).
3892 */
3893 int /* error */
3894 xfs_bmap_first_unused(
3895 xfs_trans_t *tp, /* transaction pointer */
3896 xfs_inode_t *ip, /* incore inode */
3897 xfs_extlen_t len, /* size of hole to find */
3898 xfs_fileoff_t *first_unused, /* unused block */
3899 int whichfork) /* data or attr fork */
3900 {
3901 int error; /* error return value */
3902 int idx; /* extent record index */
3903 xfs_ifork_t *ifp; /* inode fork pointer */
3904 xfs_fileoff_t lastaddr; /* last block number seen */
3905 xfs_fileoff_t lowest; /* lowest useful block */
3906 xfs_fileoff_t max; /* starting useful block */
3907 xfs_fileoff_t off; /* offset for this block */
3908 xfs_extnum_t nextents; /* number of extent entries */
3909
3910 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
3911 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
3912 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
3913 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
3914 *first_unused = 0;
3915 return 0;
3916 }
3917 ifp = XFS_IFORK_PTR(ip, whichfork);
3918 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
3919 (error = xfs_iread_extents(tp, ip, whichfork)))
3920 return error;
3921 lowest = *first_unused;
3922 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3923 for (idx = 0, lastaddr = 0, max = lowest; idx < nextents; idx++) {
3924 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
3925 off = xfs_bmbt_get_startoff(ep);
3926 /*
3927 * See if the hole before this extent will work.
3928 */
3929 if (off >= lowest + len && off - max >= len) {
3930 *first_unused = max;
3931 return 0;
3932 }
3933 lastaddr = off + xfs_bmbt_get_blockcount(ep);
3934 max = XFS_FILEOFF_MAX(lastaddr, lowest);
3935 }
3936 *first_unused = max;
3937 return 0;
3938 }
3939
3940 /*
3941 * Returns the file-relative block number of the last block + 1 before
3942 * last_block (input value) in the file.
3943 * This is not based on i_size, it is based on the extent records.
3944 * Returns 0 for local files, as they do not have extent records.
3945 */
3946 int /* error */
3947 xfs_bmap_last_before(
3948 xfs_trans_t *tp, /* transaction pointer */
3949 xfs_inode_t *ip, /* incore inode */
3950 xfs_fileoff_t *last_block, /* last block */
3951 int whichfork) /* data or attr fork */
3952 {
3953 xfs_fileoff_t bno; /* input file offset */
3954 int eof; /* hit end of file */
3955 xfs_bmbt_rec_host_t *ep; /* pointer to last extent */
3956 int error; /* error return value */
3957 xfs_bmbt_irec_t got; /* current extent value */
3958 xfs_ifork_t *ifp; /* inode fork pointer */
3959 xfs_extnum_t lastx; /* last extent used */
3960 xfs_bmbt_irec_t prev; /* previous extent value */
3961
3962 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
3963 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
3964 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
3965 return XFS_ERROR(EIO);
3966 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
3967 *last_block = 0;
3968 return 0;
3969 }
3970 ifp = XFS_IFORK_PTR(ip, whichfork);
3971 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
3972 (error = xfs_iread_extents(tp, ip, whichfork)))
3973 return error;
3974 bno = *last_block - 1;
3975 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
3976 &prev);
3977 if (eof || xfs_bmbt_get_startoff(ep) > bno) {
3978 if (prev.br_startoff == NULLFILEOFF)
3979 *last_block = 0;
3980 else
3981 *last_block = prev.br_startoff + prev.br_blockcount;
3982 }
3983 /*
3984 * Otherwise *last_block is already the right answer.
3985 */
3986 return 0;
3987 }
3988
3989 /*
3990 * Returns the file-relative block number of the first block past eof in
3991 * the file. This is not based on i_size, it is based on the extent records.
3992 * Returns 0 for local files, as they do not have extent records.
3993 */
3994 int /* error */
3995 xfs_bmap_last_offset(
3996 xfs_trans_t *tp, /* transaction pointer */
3997 xfs_inode_t *ip, /* incore inode */
3998 xfs_fileoff_t *last_block, /* last block */
3999 int whichfork) /* data or attr fork */
4000 {
4001 xfs_bmbt_rec_host_t *ep; /* pointer to last extent */
4002 int error; /* error return value */
4003 xfs_ifork_t *ifp; /* inode fork pointer */
4004 xfs_extnum_t nextents; /* number of extent entries */
4005
4006 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4007 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4008 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
4009 return XFS_ERROR(EIO);
4010 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4011 *last_block = 0;
4012 return 0;
4013 }
4014 ifp = XFS_IFORK_PTR(ip, whichfork);
4015 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4016 (error = xfs_iread_extents(tp, ip, whichfork)))
4017 return error;
4018 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4019 if (!nextents) {
4020 *last_block = 0;
4021 return 0;
4022 }
4023 ep = xfs_iext_get_ext(ifp, nextents - 1);
4024 *last_block = xfs_bmbt_get_startoff(ep) + xfs_bmbt_get_blockcount(ep);
4025 return 0;
4026 }
4027
4028 /*
4029 * Returns whether the selected fork of the inode has exactly one
4030 * block or not. For the data fork we check this matches di_size,
4031 * implying the file's range is 0..bsize-1.
4032 */
4033 int /* 1=>1 block, 0=>otherwise */
4034 xfs_bmap_one_block(
4035 xfs_inode_t *ip, /* incore inode */
4036 int whichfork) /* data or attr fork */
4037 {
4038 xfs_bmbt_rec_host_t *ep; /* ptr to fork's extent */
4039 xfs_ifork_t *ifp; /* inode fork pointer */
4040 int rval; /* return value */
4041 xfs_bmbt_irec_t s; /* internal version of extent */
4042
4043 #ifndef DEBUG
4044 if (whichfork == XFS_DATA_FORK) {
4045 return S_ISREG(ip->i_d.di_mode) ?
4046 (ip->i_size == ip->i_mount->m_sb.sb_blocksize) :
4047 (ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize);
4048 }
4049 #endif /* !DEBUG */
4050 if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
4051 return 0;
4052 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
4053 return 0;
4054 ifp = XFS_IFORK_PTR(ip, whichfork);
4055 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
4056 ep = xfs_iext_get_ext(ifp, 0);
4057 xfs_bmbt_get_all(ep, &s);
4058 rval = s.br_startoff == 0 && s.br_blockcount == 1;
4059 if (rval && whichfork == XFS_DATA_FORK)
4060 ASSERT(ip->i_size == ip->i_mount->m_sb.sb_blocksize);
4061 return rval;
4062 }
4063
4064 STATIC int
4065 xfs_bmap_sanity_check(
4066 struct xfs_mount *mp,
4067 struct xfs_buf *bp,
4068 int level)
4069 {
4070 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
4071
4072 if (block->bb_magic != cpu_to_be32(XFS_BMAP_MAGIC) ||
4073 be16_to_cpu(block->bb_level) != level ||
4074 be16_to_cpu(block->bb_numrecs) == 0 ||
4075 be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
4076 return 0;
4077 return 1;
4078 }
4079
4080 /*
4081 * Read in the extents to if_extents.
4082 * All inode fields are set up by caller, we just traverse the btree
4083 * and copy the records in. If the file system cannot contain unwritten
4084 * extents, the records are checked for no "state" flags.
4085 */
4086 int /* error */
4087 xfs_bmap_read_extents(
4088 xfs_trans_t *tp, /* transaction pointer */
4089 xfs_inode_t *ip, /* incore inode */
4090 int whichfork) /* data or attr fork */
4091 {
4092 struct xfs_btree_block *block; /* current btree block */
4093 xfs_fsblock_t bno; /* block # of "block" */
4094 xfs_buf_t *bp; /* buffer for "block" */
4095 int error; /* error return value */
4096 xfs_exntfmt_t exntf; /* XFS_EXTFMT_NOSTATE, if checking */
4097 xfs_extnum_t i, j; /* index into the extents list */
4098 xfs_ifork_t *ifp; /* fork structure */
4099 int level; /* btree level, for checking */
4100 xfs_mount_t *mp; /* file system mount structure */
4101 __be64 *pp; /* pointer to block address */
4102 /* REFERENCED */
4103 xfs_extnum_t room; /* number of entries there's room for */
4104
4105 bno = NULLFSBLOCK;
4106 mp = ip->i_mount;
4107 ifp = XFS_IFORK_PTR(ip, whichfork);
4108 exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE :
4109 XFS_EXTFMT_INODE(ip);
4110 block = ifp->if_broot;
4111 /*
4112 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
4113 */
4114 level = be16_to_cpu(block->bb_level);
4115 ASSERT(level > 0);
4116 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
4117 bno = be64_to_cpu(*pp);
4118 ASSERT(bno != NULLDFSBNO);
4119 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
4120 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
4121 /*
4122 * Go down the tree until leaf level is reached, following the first
4123 * pointer (leftmost) at each level.
4124 */
4125 while (level-- > 0) {
4126 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4127 XFS_BMAP_BTREE_REF)))
4128 return error;
4129 block = XFS_BUF_TO_BLOCK(bp);
4130 XFS_WANT_CORRUPTED_GOTO(
4131 xfs_bmap_sanity_check(mp, bp, level),
4132 error0);
4133 if (level == 0)
4134 break;
4135 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
4136 bno = be64_to_cpu(*pp);
4137 XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
4138 xfs_trans_brelse(tp, bp);
4139 }
4140 /*
4141 * Here with bp and block set to the leftmost leaf node in the tree.
4142 */
4143 room = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4144 i = 0;
4145 /*
4146 * Loop over all leaf nodes. Copy information to the extent records.
4147 */
4148 for (;;) {
4149 xfs_bmbt_rec_t *frp;
4150 xfs_fsblock_t nextbno;
4151 xfs_extnum_t num_recs;
4152 xfs_extnum_t start;
4153
4154
4155 num_recs = xfs_btree_get_numrecs(block);
4156 if (unlikely(i + num_recs > room)) {
4157 ASSERT(i + num_recs <= room);
4158 xfs_warn(ip->i_mount,
4159 "corrupt dinode %Lu, (btree extents).",
4160 (unsigned long long) ip->i_ino);
4161 XFS_CORRUPTION_ERROR("xfs_bmap_read_extents(1)",
4162 XFS_ERRLEVEL_LOW, ip->i_mount, block);
4163 goto error0;
4164 }
4165 XFS_WANT_CORRUPTED_GOTO(
4166 xfs_bmap_sanity_check(mp, bp, 0),
4167 error0);
4168 /*
4169 * Read-ahead the next leaf block, if any.
4170 */
4171 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
4172 if (nextbno != NULLFSBLOCK)
4173 xfs_btree_reada_bufl(mp, nextbno, 1);
4174 /*
4175 * Copy records into the extent records.
4176 */
4177 frp = XFS_BMBT_REC_ADDR(mp, block, 1);
4178 start = i;
4179 for (j = 0; j < num_recs; j++, i++, frp++) {
4180 xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i);
4181 trp->l0 = be64_to_cpu(frp->l0);
4182 trp->l1 = be64_to_cpu(frp->l1);
4183 }
4184 if (exntf == XFS_EXTFMT_NOSTATE) {
4185 /*
4186 * Check all attribute bmap btree records and
4187 * any "older" data bmap btree records for a
4188 * set bit in the "extent flag" position.
4189 */
4190 if (unlikely(xfs_check_nostate_extents(ifp,
4191 start, num_recs))) {
4192 XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
4193 XFS_ERRLEVEL_LOW,
4194 ip->i_mount);
4195 goto error0;
4196 }
4197 }
4198 xfs_trans_brelse(tp, bp);
4199 bno = nextbno;
4200 /*
4201 * If we've reached the end, stop.
4202 */
4203 if (bno == NULLFSBLOCK)
4204 break;
4205 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4206 XFS_BMAP_BTREE_REF)))
4207 return error;
4208 block = XFS_BUF_TO_BLOCK(bp);
4209 }
4210 ASSERT(i == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
4211 ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork));
4212 XFS_BMAP_TRACE_EXLIST(ip, i, whichfork);
4213 return 0;
4214 error0:
4215 xfs_trans_brelse(tp, bp);
4216 return XFS_ERROR(EFSCORRUPTED);
4217 }
4218
4219 #ifdef DEBUG
4220 /*
4221 * Add bmap trace insert entries for all the contents of the extent records.
4222 */
4223 void
4224 xfs_bmap_trace_exlist(
4225 xfs_inode_t *ip, /* incore inode pointer */
4226 xfs_extnum_t cnt, /* count of entries in the list */
4227 int whichfork, /* data or attr fork */
4228 unsigned long caller_ip)
4229 {
4230 xfs_extnum_t idx; /* extent record index */
4231 xfs_ifork_t *ifp; /* inode fork pointer */
4232 int state = 0;
4233
4234 if (whichfork == XFS_ATTR_FORK)
4235 state |= BMAP_ATTRFORK;
4236
4237 ifp = XFS_IFORK_PTR(ip, whichfork);
4238 ASSERT(cnt == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
4239 for (idx = 0; idx < cnt; idx++)
4240 trace_xfs_extlist(ip, idx, whichfork, caller_ip);
4241 }
4242
4243 /*
4244 * Validate that the bmbt_irecs being returned from bmapi are valid
4245 * given the callers original parameters. Specifically check the
4246 * ranges of the returned irecs to ensure that they only extent beyond
4247 * the given parameters if the XFS_BMAPI_ENTIRE flag was set.
4248 */
4249 STATIC void
4250 xfs_bmap_validate_ret(
4251 xfs_fileoff_t bno,
4252 xfs_filblks_t len,
4253 int flags,
4254 xfs_bmbt_irec_t *mval,
4255 int nmap,
4256 int ret_nmap)
4257 {
4258 int i; /* index to map values */
4259
4260 ASSERT(ret_nmap <= nmap);
4261
4262 for (i = 0; i < ret_nmap; i++) {
4263 ASSERT(mval[i].br_blockcount > 0);
4264 if (!(flags & XFS_BMAPI_ENTIRE)) {
4265 ASSERT(mval[i].br_startoff >= bno);
4266 ASSERT(mval[i].br_blockcount <= len);
4267 ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
4268 bno + len);
4269 } else {
4270 ASSERT(mval[i].br_startoff < bno + len);
4271 ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
4272 bno);
4273 }
4274 ASSERT(i == 0 ||
4275 mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
4276 mval[i].br_startoff);
4277 if ((flags & XFS_BMAPI_WRITE) && !(flags & XFS_BMAPI_DELAY))
4278 ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
4279 mval[i].br_startblock != HOLESTARTBLOCK);
4280 ASSERT(mval[i].br_state == XFS_EXT_NORM ||
4281 mval[i].br_state == XFS_EXT_UNWRITTEN);
4282 }
4283 }
4284 #endif /* DEBUG */
4285
4286
4287 /*
4288 * Map file blocks to filesystem blocks.
4289 * File range is given by the bno/len pair.
4290 * Adds blocks to file if a write ("flags & XFS_BMAPI_WRITE" set)
4291 * into a hole or past eof.
4292 * Only allocates blocks from a single allocation group,
4293 * to avoid locking problems.
4294 * The returned value in "firstblock" from the first call in a transaction
4295 * must be remembered and presented to subsequent calls in "firstblock".
4296 * An upper bound for the number of blocks to be allocated is supplied to
4297 * the first call in "total"; if no allocation group has that many free
4298 * blocks then the call will fail (return NULLFSBLOCK in "firstblock").
4299 */
4300 int /* error */
4301 xfs_bmapi(
4302 xfs_trans_t *tp, /* transaction pointer */
4303 xfs_inode_t *ip, /* incore inode */
4304 xfs_fileoff_t bno, /* starting file offs. mapped */
4305 xfs_filblks_t len, /* length to map in file */
4306 int flags, /* XFS_BMAPI_... */
4307 xfs_fsblock_t *firstblock, /* first allocated block
4308 controls a.g. for allocs */
4309 xfs_extlen_t total, /* total blocks needed */
4310 xfs_bmbt_irec_t *mval, /* output: map values */
4311 int *nmap, /* i/o: mval size/count */
4312 xfs_bmap_free_t *flist) /* i/o: list extents to free */
4313 {
4314 xfs_fsblock_t abno; /* allocated block number */
4315 xfs_extlen_t alen; /* allocated extent length */
4316 xfs_fileoff_t aoff; /* allocated file offset */
4317 xfs_bmalloca_t bma = { 0 }; /* args for xfs_bmap_alloc */
4318 xfs_btree_cur_t *cur; /* bmap btree cursor */
4319 xfs_fileoff_t end; /* end of mapped file region */
4320 int eof; /* we've hit the end of extents */
4321 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
4322 int error; /* error return */
4323 xfs_bmbt_irec_t got; /* current file extent record */
4324 xfs_ifork_t *ifp; /* inode fork pointer */
4325 xfs_extlen_t indlen; /* indirect blocks length */
4326 xfs_extnum_t lastx; /* last useful extent number */
4327 int logflags; /* flags for transaction logging */
4328 xfs_extlen_t minleft; /* min blocks left after allocation */
4329 xfs_extlen_t minlen; /* min allocation size */
4330 xfs_mount_t *mp; /* xfs mount structure */
4331 int n; /* current extent index */
4332 int nallocs; /* number of extents alloc'd */
4333 xfs_extnum_t nextents; /* number of extents in file */
4334 xfs_fileoff_t obno; /* old block number (offset) */
4335 xfs_bmbt_irec_t prev; /* previous file extent record */
4336 int tmp_logflags; /* temp flags holder */
4337 int whichfork; /* data or attr fork */
4338 char inhole; /* current location is hole in file */
4339 char wasdelay; /* old extent was delayed */
4340 char wr; /* this is a write request */
4341 char rt; /* this is a realtime file */
4342 #ifdef DEBUG
4343 xfs_fileoff_t orig_bno; /* original block number value */
4344 int orig_flags; /* original flags arg value */
4345 xfs_filblks_t orig_len; /* original value of len arg */
4346 xfs_bmbt_irec_t *orig_mval; /* original value of mval */
4347 int orig_nmap; /* original value of *nmap */
4348
4349 orig_bno = bno;
4350 orig_len = len;
4351 orig_flags = flags;
4352 orig_mval = mval;
4353 orig_nmap = *nmap;
4354 #endif
4355 ASSERT(*nmap >= 1);
4356 ASSERT(*nmap <= XFS_BMAP_MAX_NMAP || !(flags & XFS_BMAPI_WRITE));
4357 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4358 XFS_ATTR_FORK : XFS_DATA_FORK;
4359 mp = ip->i_mount;
4360 if (unlikely(XFS_TEST_ERROR(
4361 (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4362 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4363 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL),
4364 mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
4365 XFS_ERROR_REPORT("xfs_bmapi", XFS_ERRLEVEL_LOW, mp);
4366 return XFS_ERROR(EFSCORRUPTED);
4367 }
4368 if (XFS_FORCED_SHUTDOWN(mp))
4369 return XFS_ERROR(EIO);
4370 rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
4371 ifp = XFS_IFORK_PTR(ip, whichfork);
4372 ASSERT(ifp->if_ext_max ==
4373 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
4374 if ((wr = (flags & XFS_BMAPI_WRITE)) != 0)
4375 XFS_STATS_INC(xs_blk_mapw);
4376 else
4377 XFS_STATS_INC(xs_blk_mapr);
4378 /*
4379 * IGSTATE flag is used to combine extents which
4380 * differ only due to the state of the extents.
4381 * This technique is used from xfs_getbmap()
4382 * when the caller does not wish to see the
4383 * separation (which is the default).
4384 *
4385 * This technique is also used when writing a
4386 * buffer which has been partially written,
4387 * (usually by being flushed during a chunkread),
4388 * to ensure one write takes place. This also
4389 * prevents a change in the xfs inode extents at
4390 * this time, intentionally. This change occurs
4391 * on completion of the write operation, in
4392 * xfs_strat_comp(), where the xfs_bmapi() call
4393 * is transactioned, and the extents combined.
4394 */
4395 if ((flags & XFS_BMAPI_IGSTATE) && wr) /* if writing unwritten space */
4396 wr = 0; /* no allocations are allowed */
4397 ASSERT(wr || !(flags & XFS_BMAPI_DELAY));
4398 logflags = 0;
4399 nallocs = 0;
4400 cur = NULL;
4401 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4402 ASSERT(wr && tp);
4403 if ((error = xfs_bmap_local_to_extents(tp, ip,
4404 firstblock, total, &logflags, whichfork)))
4405 goto error0;
4406 }
4407 if (wr && *firstblock == NULLFSBLOCK) {
4408 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
4409 minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1;
4410 else
4411 minleft = 1;
4412 } else
4413 minleft = 0;
4414 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4415 (error = xfs_iread_extents(tp, ip, whichfork)))
4416 goto error0;
4417 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
4418 &prev);
4419 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4420 n = 0;
4421 end = bno + len;
4422 obno = bno;
4423 bma.ip = NULL;
4424
4425 while (bno < end && n < *nmap) {
4426 /*
4427 * Reading past eof, act as though there's a hole
4428 * up to end.
4429 */
4430 if (eof && !wr)
4431 got.br_startoff = end;
4432 inhole = eof || got.br_startoff > bno;
4433 wasdelay = wr && !inhole && !(flags & XFS_BMAPI_DELAY) &&
4434 isnullstartblock(got.br_startblock);
4435 /*
4436 * First, deal with the hole before the allocated space
4437 * that we found, if any.
4438 */
4439 if (wr && (inhole || wasdelay)) {
4440 /*
4441 * For the wasdelay case, we could also just
4442 * allocate the stuff asked for in this bmap call
4443 * but that wouldn't be as good.
4444 */
4445 if (wasdelay) {
4446 alen = (xfs_extlen_t)got.br_blockcount;
4447 aoff = got.br_startoff;
4448 if (lastx != NULLEXTNUM && lastx) {
4449 ep = xfs_iext_get_ext(ifp, lastx - 1);
4450 xfs_bmbt_get_all(ep, &prev);
4451 }
4452 } else {
4453 alen = (xfs_extlen_t)
4454 XFS_FILBLKS_MIN(len, MAXEXTLEN);
4455 if (!eof)
4456 alen = (xfs_extlen_t)
4457 XFS_FILBLKS_MIN(alen,
4458 got.br_startoff - bno);
4459 aoff = bno;
4460 }
4461 minlen = (flags & XFS_BMAPI_CONTIG) ? alen : 1;
4462 if (flags & XFS_BMAPI_DELAY) {
4463 xfs_extlen_t extsz;
4464
4465 /* Figure out the extent size, adjust alen */
4466 extsz = xfs_get_extsz_hint(ip);
4467 if (extsz) {
4468 /*
4469 * make sure we don't exceed a single
4470 * extent length when we align the
4471 * extent by reducing length we are
4472 * going to allocate by the maximum
4473 * amount extent size aligment may
4474 * require.
4475 */
4476 alen = XFS_FILBLKS_MIN(len,
4477 MAXEXTLEN - (2 * extsz - 1));
4478 error = xfs_bmap_extsize_align(mp,
4479 &got, &prev, extsz,
4480 rt, eof,
4481 flags&XFS_BMAPI_DELAY,
4482 flags&XFS_BMAPI_CONVERT,
4483 &aoff, &alen);
4484 ASSERT(!error);
4485 }
4486
4487 if (rt)
4488 extsz = alen / mp->m_sb.sb_rextsize;
4489
4490 /*
4491 * Make a transaction-less quota reservation for
4492 * delayed allocation blocks. This number gets
4493 * adjusted later. We return if we haven't
4494 * allocated blocks already inside this loop.
4495 */
4496 error = xfs_trans_reserve_quota_nblks(
4497 NULL, ip, (long)alen, 0,
4498 rt ? XFS_QMOPT_RES_RTBLKS :
4499 XFS_QMOPT_RES_REGBLKS);
4500 if (error) {
4501 if (n == 0) {
4502 *nmap = 0;
4503 ASSERT(cur == NULL);
4504 return error;
4505 }
4506 break;
4507 }
4508
4509 /*
4510 * Split changing sb for alen and indlen since
4511 * they could be coming from different places.
4512 */
4513 indlen = (xfs_extlen_t)
4514 xfs_bmap_worst_indlen(ip, alen);
4515 ASSERT(indlen > 0);
4516
4517 if (rt) {
4518 error = xfs_mod_incore_sb(mp,
4519 XFS_SBS_FREXTENTS,
4520 -((int64_t)extsz), 0);
4521 } else {
4522 error = xfs_icsb_modify_counters(mp,
4523 XFS_SBS_FDBLOCKS,
4524 -((int64_t)alen), 0);
4525 }
4526 if (!error) {
4527 error = xfs_icsb_modify_counters(mp,
4528 XFS_SBS_FDBLOCKS,
4529 -((int64_t)indlen), 0);
4530 if (error && rt)
4531 xfs_mod_incore_sb(mp,
4532 XFS_SBS_FREXTENTS,
4533 (int64_t)extsz, 0);
4534 else if (error)
4535 xfs_icsb_modify_counters(mp,
4536 XFS_SBS_FDBLOCKS,
4537 (int64_t)alen, 0);
4538 }
4539
4540 if (error) {
4541 if (XFS_IS_QUOTA_ON(mp))
4542 /* unreserve the blocks now */
4543 (void)
4544 xfs_trans_unreserve_quota_nblks(
4545 NULL, ip,
4546 (long)alen, 0, rt ?
4547 XFS_QMOPT_RES_RTBLKS :
4548 XFS_QMOPT_RES_REGBLKS);
4549 break;
4550 }
4551
4552 ip->i_delayed_blks += alen;
4553 abno = nullstartblock(indlen);
4554 } else {
4555 /*
4556 * If first time, allocate and fill in
4557 * once-only bma fields.
4558 */
4559 if (bma.ip == NULL) {
4560 bma.tp = tp;
4561 bma.ip = ip;
4562 bma.prevp = &prev;
4563 bma.gotp = &got;
4564 bma.total = total;
4565 bma.userdata = 0;
4566 }
4567 /* Indicate if this is the first user data
4568 * in the file, or just any user data.
4569 */
4570 if (!(flags & XFS_BMAPI_METADATA)) {
4571 bma.userdata = (aoff == 0) ?
4572 XFS_ALLOC_INITIAL_USER_DATA :
4573 XFS_ALLOC_USERDATA;
4574 }
4575 /*
4576 * Fill in changeable bma fields.
4577 */
4578 bma.eof = eof;
4579 bma.firstblock = *firstblock;
4580 bma.alen = alen;
4581 bma.off = aoff;
4582 bma.conv = !!(flags & XFS_BMAPI_CONVERT);
4583 bma.wasdel = wasdelay;
4584 bma.minlen = minlen;
4585 bma.low = flist->xbf_low;
4586 bma.minleft = minleft;
4587 /*
4588 * Only want to do the alignment at the
4589 * eof if it is userdata and allocation length
4590 * is larger than a stripe unit.
4591 */
4592 if (mp->m_dalign && alen >= mp->m_dalign &&
4593 (!(flags & XFS_BMAPI_METADATA)) &&
4594 (whichfork == XFS_DATA_FORK)) {
4595 if ((error = xfs_bmap_isaeof(ip, aoff,
4596 whichfork, &bma.aeof)))
4597 goto error0;
4598 } else
4599 bma.aeof = 0;
4600 /*
4601 * Call allocator.
4602 */
4603 if ((error = xfs_bmap_alloc(&bma)))
4604 goto error0;
4605 /*
4606 * Copy out result fields.
4607 */
4608 abno = bma.rval;
4609 if ((flist->xbf_low = bma.low))
4610 minleft = 0;
4611 alen = bma.alen;
4612 aoff = bma.off;
4613 ASSERT(*firstblock == NULLFSBLOCK ||
4614 XFS_FSB_TO_AGNO(mp, *firstblock) ==
4615 XFS_FSB_TO_AGNO(mp, bma.firstblock) ||
4616 (flist->xbf_low &&
4617 XFS_FSB_TO_AGNO(mp, *firstblock) <
4618 XFS_FSB_TO_AGNO(mp, bma.firstblock)));
4619 *firstblock = bma.firstblock;
4620 if (cur)
4621 cur->bc_private.b.firstblock =
4622 *firstblock;
4623 if (abno == NULLFSBLOCK)
4624 break;
4625 if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
4626 cur = xfs_bmbt_init_cursor(mp, tp,
4627 ip, whichfork);
4628 cur->bc_private.b.firstblock =
4629 *firstblock;
4630 cur->bc_private.b.flist = flist;
4631 }
4632 /*
4633 * Bump the number of extents we've allocated
4634 * in this call.
4635 */
4636 nallocs++;
4637 }
4638 if (cur)
4639 cur->bc_private.b.flags =
4640 wasdelay ? XFS_BTCUR_BPRV_WASDEL : 0;
4641 got.br_startoff = aoff;
4642 got.br_startblock = abno;
4643 got.br_blockcount = alen;
4644 got.br_state = XFS_EXT_NORM; /* assume normal */
4645 /*
4646 * Determine state of extent, and the filesystem.
4647 * A wasdelay extent has been initialized, so
4648 * shouldn't be flagged as unwritten.
4649 */
4650 if (wr && xfs_sb_version_hasextflgbit(&mp->m_sb)) {
4651 if (!wasdelay && (flags & XFS_BMAPI_PREALLOC))
4652 got.br_state = XFS_EXT_UNWRITTEN;
4653 }
4654 error = xfs_bmap_add_extent(tp, ip, &lastx, &cur, &got,
4655 firstblock, flist, &tmp_logflags,
4656 whichfork);
4657 logflags |= tmp_logflags;
4658 if (error)
4659 goto error0;
4660 ep = xfs_iext_get_ext(ifp, lastx);
4661 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4662 xfs_bmbt_get_all(ep, &got);
4663 ASSERT(got.br_startoff <= aoff);
4664 ASSERT(got.br_startoff + got.br_blockcount >=
4665 aoff + alen);
4666 #ifdef DEBUG
4667 if (flags & XFS_BMAPI_DELAY) {
4668 ASSERT(isnullstartblock(got.br_startblock));
4669 ASSERT(startblockval(got.br_startblock) > 0);
4670 }
4671 ASSERT(got.br_state == XFS_EXT_NORM ||
4672 got.br_state == XFS_EXT_UNWRITTEN);
4673 #endif
4674 /*
4675 * Fall down into the found allocated space case.
4676 */
4677 } else if (inhole) {
4678 /*
4679 * Reading in a hole.
4680 */
4681 mval->br_startoff = bno;
4682 mval->br_startblock = HOLESTARTBLOCK;
4683 mval->br_blockcount =
4684 XFS_FILBLKS_MIN(len, got.br_startoff - bno);
4685 mval->br_state = XFS_EXT_NORM;
4686 bno += mval->br_blockcount;
4687 len -= mval->br_blockcount;
4688 mval++;
4689 n++;
4690 continue;
4691 }
4692 /*
4693 * Then deal with the allocated space we found.
4694 */
4695 ASSERT(ep != NULL);
4696 if (!(flags & XFS_BMAPI_ENTIRE) &&
4697 (got.br_startoff + got.br_blockcount > obno)) {
4698 if (obno > bno)
4699 bno = obno;
4700 ASSERT((bno >= obno) || (n == 0));
4701 ASSERT(bno < end);
4702 mval->br_startoff = bno;
4703 if (isnullstartblock(got.br_startblock)) {
4704 ASSERT(!wr || (flags & XFS_BMAPI_DELAY));
4705 mval->br_startblock = DELAYSTARTBLOCK;
4706 } else
4707 mval->br_startblock =
4708 got.br_startblock +
4709 (bno - got.br_startoff);
4710 /*
4711 * Return the minimum of what we got and what we
4712 * asked for for the length. We can use the len
4713 * variable here because it is modified below
4714 * and we could have been there before coming
4715 * here if the first part of the allocation
4716 * didn't overlap what was asked for.
4717 */
4718 mval->br_blockcount =
4719 XFS_FILBLKS_MIN(end - bno, got.br_blockcount -
4720 (bno - got.br_startoff));
4721 mval->br_state = got.br_state;
4722 ASSERT(mval->br_blockcount <= len);
4723 } else {
4724 *mval = got;
4725 if (isnullstartblock(mval->br_startblock)) {
4726 ASSERT(!wr || (flags & XFS_BMAPI_DELAY));
4727 mval->br_startblock = DELAYSTARTBLOCK;
4728 }
4729 }
4730
4731 /*
4732 * Check if writing previously allocated but
4733 * unwritten extents.
4734 */
4735 if (wr &&
4736 ((mval->br_state == XFS_EXT_UNWRITTEN &&
4737 ((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_DELAY)) == 0)) ||
4738 (mval->br_state == XFS_EXT_NORM &&
4739 ((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_CONVERT)) ==
4740 (XFS_BMAPI_PREALLOC|XFS_BMAPI_CONVERT))))) {
4741 /*
4742 * Modify (by adding) the state flag, if writing.
4743 */
4744 ASSERT(mval->br_blockcount <= len);
4745 if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
4746 cur = xfs_bmbt_init_cursor(mp,
4747 tp, ip, whichfork);
4748 cur->bc_private.b.firstblock =
4749 *firstblock;
4750 cur->bc_private.b.flist = flist;
4751 }
4752 mval->br_state = (mval->br_state == XFS_EXT_UNWRITTEN)
4753 ? XFS_EXT_NORM
4754 : XFS_EXT_UNWRITTEN;
4755 error = xfs_bmap_add_extent(tp, ip, &lastx, &cur, mval,
4756 firstblock, flist, &tmp_logflags,
4757 whichfork);
4758 logflags |= tmp_logflags;
4759 if (error)
4760 goto error0;
4761 ep = xfs_iext_get_ext(ifp, lastx);
4762 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4763 xfs_bmbt_get_all(ep, &got);
4764 /*
4765 * We may have combined previously unwritten
4766 * space with written space, so generate
4767 * another request.
4768 */
4769 if (mval->br_blockcount < len)
4770 continue;
4771 }
4772
4773 ASSERT((flags & XFS_BMAPI_ENTIRE) ||
4774 ((mval->br_startoff + mval->br_blockcount) <= end));
4775 ASSERT((flags & XFS_BMAPI_ENTIRE) ||
4776 (mval->br_blockcount <= len) ||
4777 (mval->br_startoff < obno));
4778 bno = mval->br_startoff + mval->br_blockcount;
4779 len = end - bno;
4780 if (n > 0 && mval->br_startoff == mval[-1].br_startoff) {
4781 ASSERT(mval->br_startblock == mval[-1].br_startblock);
4782 ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
4783 ASSERT(mval->br_state == mval[-1].br_state);
4784 mval[-1].br_blockcount = mval->br_blockcount;
4785 mval[-1].br_state = mval->br_state;
4786 } else if (n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
4787 mval[-1].br_startblock != DELAYSTARTBLOCK &&
4788 mval[-1].br_startblock != HOLESTARTBLOCK &&
4789 mval->br_startblock ==
4790 mval[-1].br_startblock + mval[-1].br_blockcount &&
4791 ((flags & XFS_BMAPI_IGSTATE) ||
4792 mval[-1].br_state == mval->br_state)) {
4793 ASSERT(mval->br_startoff ==
4794 mval[-1].br_startoff + mval[-1].br_blockcount);
4795 mval[-1].br_blockcount += mval->br_blockcount;
4796 } else if (n > 0 &&
4797 mval->br_startblock == DELAYSTARTBLOCK &&
4798 mval[-1].br_startblock == DELAYSTARTBLOCK &&
4799 mval->br_startoff ==
4800 mval[-1].br_startoff + mval[-1].br_blockcount) {
4801 mval[-1].br_blockcount += mval->br_blockcount;
4802 mval[-1].br_state = mval->br_state;
4803 } else if (!((n == 0) &&
4804 ((mval->br_startoff + mval->br_blockcount) <=
4805 obno))) {
4806 mval++;
4807 n++;
4808 }
4809 /*
4810 * If we're done, stop now. Stop when we've allocated
4811 * XFS_BMAP_MAX_NMAP extents no matter what. Otherwise
4812 * the transaction may get too big.
4813 */
4814 if (bno >= end || n >= *nmap || nallocs >= *nmap)
4815 break;
4816 /*
4817 * Else go on to the next record.
4818 */
4819 prev = got;
4820 if (++lastx < nextents) {
4821 ep = xfs_iext_get_ext(ifp, lastx);
4822 xfs_bmbt_get_all(ep, &got);
4823 } else {
4824 eof = 1;
4825 }
4826 }
4827 *nmap = n;
4828 /*
4829 * Transform from btree to extents, give it cur.
4830 */
4831 if (tp && XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
4832 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
4833 ASSERT(wr && cur);
4834 error = xfs_bmap_btree_to_extents(tp, ip, cur,
4835 &tmp_logflags, whichfork);
4836 logflags |= tmp_logflags;
4837 if (error)
4838 goto error0;
4839 }
4840 ASSERT(ifp->if_ext_max ==
4841 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
4842 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
4843 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max);
4844 error = 0;
4845 error0:
4846 /*
4847 * Log everything. Do this after conversion, there's no point in
4848 * logging the extent records if we've converted to btree format.
4849 */
4850 if ((logflags & xfs_ilog_fext(whichfork)) &&
4851 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
4852 logflags &= ~xfs_ilog_fext(whichfork);
4853 else if ((logflags & xfs_ilog_fbroot(whichfork)) &&
4854 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
4855 logflags &= ~xfs_ilog_fbroot(whichfork);
4856 /*
4857 * Log whatever the flags say, even if error. Otherwise we might miss
4858 * detecting a case where the data is changed, there's an error,
4859 * and it's not logged so we don't shutdown when we should.
4860 */
4861 if (logflags) {
4862 ASSERT(tp && wr);
4863 xfs_trans_log_inode(tp, ip, logflags);
4864 }
4865 if (cur) {
4866 if (!error) {
4867 ASSERT(*firstblock == NULLFSBLOCK ||
4868 XFS_FSB_TO_AGNO(mp, *firstblock) ==
4869 XFS_FSB_TO_AGNO(mp,
4870 cur->bc_private.b.firstblock) ||
4871 (flist->xbf_low &&
4872 XFS_FSB_TO_AGNO(mp, *firstblock) <
4873 XFS_FSB_TO_AGNO(mp,
4874 cur->bc_private.b.firstblock)));
4875 *firstblock = cur->bc_private.b.firstblock;
4876 }
4877 xfs_btree_del_cursor(cur,
4878 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
4879 }
4880 if (!error)
4881 xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
4882 orig_nmap, *nmap);
4883 return error;
4884 }
4885
4886 /*
4887 * Map file blocks to filesystem blocks, simple version.
4888 * One block (extent) only, read-only.
4889 * For flags, only the XFS_BMAPI_ATTRFORK flag is examined.
4890 * For the other flag values, the effect is as if XFS_BMAPI_METADATA
4891 * was set and all the others were clear.
4892 */
4893 int /* error */
4894 xfs_bmapi_single(
4895 xfs_trans_t *tp, /* transaction pointer */
4896 xfs_inode_t *ip, /* incore inode */
4897 int whichfork, /* data or attr fork */
4898 xfs_fsblock_t *fsb, /* output: mapped block */
4899 xfs_fileoff_t bno) /* starting file offs. mapped */
4900 {
4901 int eof; /* we've hit the end of extents */
4902 int error; /* error return */
4903 xfs_bmbt_irec_t got; /* current file extent record */
4904 xfs_ifork_t *ifp; /* inode fork pointer */
4905 xfs_extnum_t lastx; /* last useful extent number */
4906 xfs_bmbt_irec_t prev; /* previous file extent record */
4907
4908 ifp = XFS_IFORK_PTR(ip, whichfork);
4909 if (unlikely(
4910 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4911 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)) {
4912 XFS_ERROR_REPORT("xfs_bmapi_single", XFS_ERRLEVEL_LOW,
4913 ip->i_mount);
4914 return XFS_ERROR(EFSCORRUPTED);
4915 }
4916 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
4917 return XFS_ERROR(EIO);
4918 XFS_STATS_INC(xs_blk_mapr);
4919 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4920 (error = xfs_iread_extents(tp, ip, whichfork)))
4921 return error;
4922 (void)xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
4923 &prev);
4924 /*
4925 * Reading past eof, act as though there's a hole
4926 * up to end.
4927 */
4928 if (eof || got.br_startoff > bno) {
4929 *fsb = NULLFSBLOCK;
4930 return 0;
4931 }
4932 ASSERT(!isnullstartblock(got.br_startblock));
4933 ASSERT(bno < got.br_startoff + got.br_blockcount);
4934 *fsb = got.br_startblock + (bno - got.br_startoff);
4935 return 0;
4936 }
4937
4938 /*
4939 * Unmap (remove) blocks from a file.
4940 * If nexts is nonzero then the number of extents to remove is limited to
4941 * that value. If not all extents in the block range can be removed then
4942 * *done is set.
4943 */
4944 int /* error */
4945 xfs_bunmapi(
4946 xfs_trans_t *tp, /* transaction pointer */
4947 struct xfs_inode *ip, /* incore inode */
4948 xfs_fileoff_t bno, /* starting offset to unmap */
4949 xfs_filblks_t len, /* length to unmap in file */
4950 int flags, /* misc flags */
4951 xfs_extnum_t nexts, /* number of extents max */
4952 xfs_fsblock_t *firstblock, /* first allocated block
4953 controls a.g. for allocs */
4954 xfs_bmap_free_t *flist, /* i/o: list extents to free */
4955 int *done) /* set if not done yet */
4956 {
4957 xfs_btree_cur_t *cur; /* bmap btree cursor */
4958 xfs_bmbt_irec_t del; /* extent being deleted */
4959 int eof; /* is deleting at eof */
4960 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
4961 int error; /* error return value */
4962 xfs_extnum_t extno; /* extent number in list */
4963 xfs_bmbt_irec_t got; /* current extent record */
4964 xfs_ifork_t *ifp; /* inode fork pointer */
4965 int isrt; /* freeing in rt area */
4966 xfs_extnum_t lastx; /* last extent index used */
4967 int logflags; /* transaction logging flags */
4968 xfs_extlen_t mod; /* rt extent offset */
4969 xfs_mount_t *mp; /* mount structure */
4970 xfs_extnum_t nextents; /* number of file extents */
4971 xfs_bmbt_irec_t prev; /* previous extent record */
4972 xfs_fileoff_t start; /* first file offset deleted */
4973 int tmp_logflags; /* partial logging flags */
4974 int wasdel; /* was a delayed alloc extent */
4975 int whichfork; /* data or attribute fork */
4976 xfs_fsblock_t sum;
4977
4978 trace_xfs_bunmap(ip, bno, len, flags, _RET_IP_);
4979
4980 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4981 XFS_ATTR_FORK : XFS_DATA_FORK;
4982 ifp = XFS_IFORK_PTR(ip, whichfork);
4983 if (unlikely(
4984 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4985 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
4986 XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW,
4987 ip->i_mount);
4988 return XFS_ERROR(EFSCORRUPTED);
4989 }
4990 mp = ip->i_mount;
4991 if (XFS_FORCED_SHUTDOWN(mp))
4992 return XFS_ERROR(EIO);
4993
4994 ASSERT(len > 0);
4995 ASSERT(nexts >= 0);
4996 ASSERT(ifp->if_ext_max ==
4997 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
4998 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4999 (error = xfs_iread_extents(tp, ip, whichfork)))
5000 return error;
5001 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5002 if (nextents == 0) {
5003 *done = 1;
5004 return 0;
5005 }
5006 XFS_STATS_INC(xs_blk_unmap);
5007 isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
5008 start = bno;
5009 bno = start + len - 1;
5010 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
5011 &prev);
5012
5013 /*
5014 * Check to see if the given block number is past the end of the
5015 * file, back up to the last block if so...
5016 */
5017 if (eof) {
5018 ep = xfs_iext_get_ext(ifp, --lastx);
5019 xfs_bmbt_get_all(ep, &got);
5020 bno = got.br_startoff + got.br_blockcount - 1;
5021 }
5022 logflags = 0;
5023 if (ifp->if_flags & XFS_IFBROOT) {
5024 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
5025 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
5026 cur->bc_private.b.firstblock = *firstblock;
5027 cur->bc_private.b.flist = flist;
5028 cur->bc_private.b.flags = 0;
5029 } else
5030 cur = NULL;
5031 extno = 0;
5032 while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
5033 (nexts == 0 || extno < nexts)) {
5034 /*
5035 * Is the found extent after a hole in which bno lives?
5036 * Just back up to the previous extent, if so.
5037 */
5038 if (got.br_startoff > bno) {
5039 if (--lastx < 0)
5040 break;
5041 ep = xfs_iext_get_ext(ifp, lastx);
5042 xfs_bmbt_get_all(ep, &got);
5043 }
5044 /*
5045 * Is the last block of this extent before the range
5046 * we're supposed to delete? If so, we're done.
5047 */
5048 bno = XFS_FILEOFF_MIN(bno,
5049 got.br_startoff + got.br_blockcount - 1);
5050 if (bno < start)
5051 break;
5052 /*
5053 * Then deal with the (possibly delayed) allocated space
5054 * we found.
5055 */
5056 ASSERT(ep != NULL);
5057 del = got;
5058 wasdel = isnullstartblock(del.br_startblock);
5059 if (got.br_startoff < start) {
5060 del.br_startoff = start;
5061 del.br_blockcount -= start - got.br_startoff;
5062 if (!wasdel)
5063 del.br_startblock += start - got.br_startoff;
5064 }
5065 if (del.br_startoff + del.br_blockcount > bno + 1)
5066 del.br_blockcount = bno + 1 - del.br_startoff;
5067 sum = del.br_startblock + del.br_blockcount;
5068 if (isrt &&
5069 (mod = do_mod(sum, mp->m_sb.sb_rextsize))) {
5070 /*
5071 * Realtime extent not lined up at the end.
5072 * The extent could have been split into written
5073 * and unwritten pieces, or we could just be
5074 * unmapping part of it. But we can't really
5075 * get rid of part of a realtime extent.
5076 */
5077 if (del.br_state == XFS_EXT_UNWRITTEN ||
5078 !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5079 /*
5080 * This piece is unwritten, or we're not
5081 * using unwritten extents. Skip over it.
5082 */
5083 ASSERT(bno >= mod);
5084 bno -= mod > del.br_blockcount ?
5085 del.br_blockcount : mod;
5086 if (bno < got.br_startoff) {
5087 if (--lastx >= 0)
5088 xfs_bmbt_get_all(xfs_iext_get_ext(
5089 ifp, lastx), &got);
5090 }
5091 continue;
5092 }
5093 /*
5094 * It's written, turn it unwritten.
5095 * This is better than zeroing it.
5096 */
5097 ASSERT(del.br_state == XFS_EXT_NORM);
5098 ASSERT(xfs_trans_get_block_res(tp) > 0);
5099 /*
5100 * If this spans a realtime extent boundary,
5101 * chop it back to the start of the one we end at.
5102 */
5103 if (del.br_blockcount > mod) {
5104 del.br_startoff += del.br_blockcount - mod;
5105 del.br_startblock += del.br_blockcount - mod;
5106 del.br_blockcount = mod;
5107 }
5108 del.br_state = XFS_EXT_UNWRITTEN;
5109 error = xfs_bmap_add_extent(tp, ip, &lastx, &cur, &del,
5110 firstblock, flist, &logflags,
5111 XFS_DATA_FORK);
5112 if (error)
5113 goto error0;
5114 goto nodelete;
5115 }
5116 if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) {
5117 /*
5118 * Realtime extent is lined up at the end but not
5119 * at the front. We'll get rid of full extents if
5120 * we can.
5121 */
5122 mod = mp->m_sb.sb_rextsize - mod;
5123 if (del.br_blockcount > mod) {
5124 del.br_blockcount -= mod;
5125 del.br_startoff += mod;
5126 del.br_startblock += mod;
5127 } else if ((del.br_startoff == start &&
5128 (del.br_state == XFS_EXT_UNWRITTEN ||
5129 xfs_trans_get_block_res(tp) == 0)) ||
5130 !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5131 /*
5132 * Can't make it unwritten. There isn't
5133 * a full extent here so just skip it.
5134 */
5135 ASSERT(bno >= del.br_blockcount);
5136 bno -= del.br_blockcount;
5137 if (got.br_startoff > bno) {
5138 if (--lastx >= 0) {
5139 ep = xfs_iext_get_ext(ifp,
5140 lastx);
5141 xfs_bmbt_get_all(ep, &got);
5142 }
5143 }
5144 continue;
5145 } else if (del.br_state == XFS_EXT_UNWRITTEN) {
5146 /*
5147 * This one is already unwritten.
5148 * It must have a written left neighbor.
5149 * Unwrite the killed part of that one and
5150 * try again.
5151 */
5152 ASSERT(lastx > 0);
5153 xfs_bmbt_get_all(xfs_iext_get_ext(ifp,
5154 lastx - 1), &prev);
5155 ASSERT(prev.br_state == XFS_EXT_NORM);
5156 ASSERT(!isnullstartblock(prev.br_startblock));
5157 ASSERT(del.br_startblock ==
5158 prev.br_startblock + prev.br_blockcount);
5159 if (prev.br_startoff < start) {
5160 mod = start - prev.br_startoff;
5161 prev.br_blockcount -= mod;
5162 prev.br_startblock += mod;
5163 prev.br_startoff = start;
5164 }
5165 prev.br_state = XFS_EXT_UNWRITTEN;
5166 lastx--;
5167 error = xfs_bmap_add_extent(tp, ip, &lastx,
5168 &cur, &prev, firstblock, flist,
5169 &logflags, XFS_DATA_FORK);
5170 if (error)
5171 goto error0;
5172 goto nodelete;
5173 } else {
5174 ASSERT(del.br_state == XFS_EXT_NORM);
5175 del.br_state = XFS_EXT_UNWRITTEN;
5176 error = xfs_bmap_add_extent(tp, ip, &lastx,
5177 &cur, &del, firstblock, flist,
5178 &logflags, XFS_DATA_FORK);
5179 if (error)
5180 goto error0;
5181 goto nodelete;
5182 }
5183 }
5184 if (wasdel) {
5185 ASSERT(startblockval(del.br_startblock) > 0);
5186 /* Update realtime/data freespace, unreserve quota */
5187 if (isrt) {
5188 xfs_filblks_t rtexts;
5189
5190 rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
5191 do_div(rtexts, mp->m_sb.sb_rextsize);
5192 xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
5193 (int64_t)rtexts, 0);
5194 (void)xfs_trans_reserve_quota_nblks(NULL,
5195 ip, -((long)del.br_blockcount), 0,
5196 XFS_QMOPT_RES_RTBLKS);
5197 } else {
5198 xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
5199 (int64_t)del.br_blockcount, 0);
5200 (void)xfs_trans_reserve_quota_nblks(NULL,
5201 ip, -((long)del.br_blockcount), 0,
5202 XFS_QMOPT_RES_REGBLKS);
5203 }
5204 ip->i_delayed_blks -= del.br_blockcount;
5205 if (cur)
5206 cur->bc_private.b.flags |=
5207 XFS_BTCUR_BPRV_WASDEL;
5208 } else if (cur)
5209 cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
5210 /*
5211 * If it's the case where the directory code is running
5212 * with no block reservation, and the deleted block is in
5213 * the middle of its extent, and the resulting insert
5214 * of an extent would cause transformation to btree format,
5215 * then reject it. The calling code will then swap
5216 * blocks around instead.
5217 * We have to do this now, rather than waiting for the
5218 * conversion to btree format, since the transaction
5219 * will be dirty.
5220 */
5221 if (!wasdel && xfs_trans_get_block_res(tp) == 0 &&
5222 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5223 XFS_IFORK_NEXTENTS(ip, whichfork) >= ifp->if_ext_max &&
5224 del.br_startoff > got.br_startoff &&
5225 del.br_startoff + del.br_blockcount <
5226 got.br_startoff + got.br_blockcount) {
5227 error = XFS_ERROR(ENOSPC);
5228 goto error0;
5229 }
5230 error = xfs_bmap_del_extent(ip, tp, &lastx, flist, cur, &del,
5231 &tmp_logflags, whichfork);
5232 logflags |= tmp_logflags;
5233 if (error)
5234 goto error0;
5235 bno = del.br_startoff - 1;
5236 nodelete:
5237 /*
5238 * If not done go on to the next (previous) record.
5239 */
5240 if (bno != (xfs_fileoff_t)-1 && bno >= start) {
5241 if (lastx >= 0) {
5242 ep = xfs_iext_get_ext(ifp, lastx);
5243 if (xfs_bmbt_get_startoff(ep) > bno) {
5244 if (--lastx >= 0)
5245 ep = xfs_iext_get_ext(ifp,
5246 lastx);
5247 }
5248 xfs_bmbt_get_all(ep, &got);
5249 }
5250 extno++;
5251 }
5252 }
5253 *done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0;
5254 ASSERT(ifp->if_ext_max ==
5255 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5256 /*
5257 * Convert to a btree if necessary.
5258 */
5259 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5260 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
5261 ASSERT(cur == NULL);
5262 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist,
5263 &cur, 0, &tmp_logflags, whichfork);
5264 logflags |= tmp_logflags;
5265 if (error)
5266 goto error0;
5267 }
5268 /*
5269 * transform from btree to extents, give it cur
5270 */
5271 else if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
5272 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
5273 ASSERT(cur != NULL);
5274 error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
5275 whichfork);
5276 logflags |= tmp_logflags;
5277 if (error)
5278 goto error0;
5279 }
5280 /*
5281 * transform from extents to local?
5282 */
5283 ASSERT(ifp->if_ext_max ==
5284 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5285 error = 0;
5286 error0:
5287 /*
5288 * Log everything. Do this after conversion, there's no point in
5289 * logging the extent records if we've converted to btree format.
5290 */
5291 if ((logflags & xfs_ilog_fext(whichfork)) &&
5292 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5293 logflags &= ~xfs_ilog_fext(whichfork);
5294 else if ((logflags & xfs_ilog_fbroot(whichfork)) &&
5295 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5296 logflags &= ~xfs_ilog_fbroot(whichfork);
5297 /*
5298 * Log inode even in the error case, if the transaction
5299 * is dirty we'll need to shut down the filesystem.
5300 */
5301 if (logflags)
5302 xfs_trans_log_inode(tp, ip, logflags);
5303 if (cur) {
5304 if (!error) {
5305 *firstblock = cur->bc_private.b.firstblock;
5306 cur->bc_private.b.allocated = 0;
5307 }
5308 xfs_btree_del_cursor(cur,
5309 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5310 }
5311 return error;
5312 }
5313
5314 /*
5315 * returns 1 for success, 0 if we failed to map the extent.
5316 */
5317 STATIC int
5318 xfs_getbmapx_fix_eof_hole(
5319 xfs_inode_t *ip, /* xfs incore inode pointer */
5320 struct getbmapx *out, /* output structure */
5321 int prealloced, /* this is a file with
5322 * preallocated data space */
5323 __int64_t end, /* last block requested */
5324 xfs_fsblock_t startblock)
5325 {
5326 __int64_t fixlen;
5327 xfs_mount_t *mp; /* file system mount point */
5328 xfs_ifork_t *ifp; /* inode fork pointer */
5329 xfs_extnum_t lastx; /* last extent pointer */
5330 xfs_fileoff_t fileblock;
5331
5332 if (startblock == HOLESTARTBLOCK) {
5333 mp = ip->i_mount;
5334 out->bmv_block = -1;
5335 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, ip->i_size));
5336 fixlen -= out->bmv_offset;
5337 if (prealloced && out->bmv_offset + out->bmv_length == end) {
5338 /* Came to hole at EOF. Trim it. */
5339 if (fixlen <= 0)
5340 return 0;
5341 out->bmv_length = fixlen;
5342 }
5343 } else {
5344 if (startblock == DELAYSTARTBLOCK)
5345 out->bmv_block = -2;
5346 else
5347 out->bmv_block = xfs_fsb_to_db(ip, startblock);
5348 fileblock = XFS_BB_TO_FSB(ip->i_mount, out->bmv_offset);
5349 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
5350 if (xfs_iext_bno_to_ext(ifp, fileblock, &lastx) &&
5351 (lastx == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))-1))
5352 out->bmv_oflags |= BMV_OF_LAST;
5353 }
5354
5355 return 1;
5356 }
5357
5358 /*
5359 * Get inode's extents as described in bmv, and format for output.
5360 * Calls formatter to fill the user's buffer until all extents
5361 * are mapped, until the passed-in bmv->bmv_count slots have
5362 * been filled, or until the formatter short-circuits the loop,
5363 * if it is tracking filled-in extents on its own.
5364 */
5365 int /* error code */
5366 xfs_getbmap(
5367 xfs_inode_t *ip,
5368 struct getbmapx *bmv, /* user bmap structure */
5369 xfs_bmap_format_t formatter, /* format to user */
5370 void *arg) /* formatter arg */
5371 {
5372 __int64_t bmvend; /* last block requested */
5373 int error = 0; /* return value */
5374 __int64_t fixlen; /* length for -1 case */
5375 int i; /* extent number */
5376 int lock; /* lock state */
5377 xfs_bmbt_irec_t *map; /* buffer for user's data */
5378 xfs_mount_t *mp; /* file system mount point */
5379 int nex; /* # of user extents can do */
5380 int nexleft; /* # of user extents left */
5381 int subnex; /* # of bmapi's can do */
5382 int nmap; /* number of map entries */
5383 struct getbmapx *out; /* output structure */
5384 int whichfork; /* data or attr fork */
5385 int prealloced; /* this is a file with
5386 * preallocated data space */
5387 int iflags; /* interface flags */
5388 int bmapi_flags; /* flags for xfs_bmapi */
5389 int cur_ext = 0;
5390
5391 mp = ip->i_mount;
5392 iflags = bmv->bmv_iflags;
5393 whichfork = iflags & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
5394
5395 if (whichfork == XFS_ATTR_FORK) {
5396 if (XFS_IFORK_Q(ip)) {
5397 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS &&
5398 ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE &&
5399 ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)
5400 return XFS_ERROR(EINVAL);
5401 } else if (unlikely(
5402 ip->i_d.di_aformat != 0 &&
5403 ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) {
5404 XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW,
5405 ip->i_mount);
5406 return XFS_ERROR(EFSCORRUPTED);
5407 }
5408
5409 prealloced = 0;
5410 fixlen = 1LL << 32;
5411 } else {
5412 if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
5413 ip->i_d.di_format != XFS_DINODE_FMT_BTREE &&
5414 ip->i_d.di_format != XFS_DINODE_FMT_LOCAL)
5415 return XFS_ERROR(EINVAL);
5416
5417 if (xfs_get_extsz_hint(ip) ||
5418 ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){
5419 prealloced = 1;
5420 fixlen = XFS_MAXIOFFSET(mp);
5421 } else {
5422 prealloced = 0;
5423 fixlen = ip->i_size;
5424 }
5425 }
5426
5427 if (bmv->bmv_length == -1) {
5428 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen));
5429 bmv->bmv_length =
5430 max_t(__int64_t, fixlen - bmv->bmv_offset, 0);
5431 } else if (bmv->bmv_length == 0) {
5432 bmv->bmv_entries = 0;
5433 return 0;
5434 } else if (bmv->bmv_length < 0) {
5435 return XFS_ERROR(EINVAL);
5436 }
5437
5438 nex = bmv->bmv_count - 1;
5439 if (nex <= 0)
5440 return XFS_ERROR(EINVAL);
5441 bmvend = bmv->bmv_offset + bmv->bmv_length;
5442
5443
5444 if (bmv->bmv_count > ULONG_MAX / sizeof(struct getbmapx))
5445 return XFS_ERROR(ENOMEM);
5446 out = kmem_zalloc(bmv->bmv_count * sizeof(struct getbmapx), KM_MAYFAIL);
5447 if (!out)
5448 return XFS_ERROR(ENOMEM);
5449
5450 xfs_ilock(ip, XFS_IOLOCK_SHARED);
5451 if (whichfork == XFS_DATA_FORK && !(iflags & BMV_IF_DELALLOC)) {
5452 if (ip->i_delayed_blks || ip->i_size > ip->i_d.di_size) {
5453 error = xfs_flush_pages(ip, 0, -1, 0, FI_REMAPF);
5454 if (error)
5455 goto out_unlock_iolock;
5456 }
5457 /*
5458 * even after flushing the inode, there can still be delalloc
5459 * blocks on the inode beyond EOF due to speculative
5460 * preallocation. These are not removed until the release
5461 * function is called or the inode is inactivated. Hence we
5462 * cannot assert here that ip->i_delayed_blks == 0.
5463 */
5464 }
5465
5466 lock = xfs_ilock_map_shared(ip);
5467
5468 /*
5469 * Don't let nex be bigger than the number of extents
5470 * we can have assuming alternating holes and real extents.
5471 */
5472 if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1)
5473 nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1;
5474
5475 bmapi_flags = xfs_bmapi_aflag(whichfork);
5476 if (!(iflags & BMV_IF_PREALLOC))
5477 bmapi_flags |= XFS_BMAPI_IGSTATE;
5478
5479 /*
5480 * Allocate enough space to handle "subnex" maps at a time.
5481 */
5482 error = ENOMEM;
5483 subnex = 16;
5484 map = kmem_alloc(subnex * sizeof(*map), KM_MAYFAIL | KM_NOFS);
5485 if (!map)
5486 goto out_unlock_ilock;
5487
5488 bmv->bmv_entries = 0;
5489
5490 if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0 &&
5491 (whichfork == XFS_ATTR_FORK || !(iflags & BMV_IF_DELALLOC))) {
5492 error = 0;
5493 goto out_free_map;
5494 }
5495
5496 nexleft = nex;
5497
5498 do {
5499 nmap = (nexleft > subnex) ? subnex : nexleft;
5500 error = xfs_bmapi(NULL, ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
5501 XFS_BB_TO_FSB(mp, bmv->bmv_length),
5502 bmapi_flags, NULL, 0, map, &nmap,
5503 NULL);
5504 if (error)
5505 goto out_free_map;
5506 ASSERT(nmap <= subnex);
5507
5508 for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
5509 out[cur_ext].bmv_oflags = 0;
5510 if (map[i].br_state == XFS_EXT_UNWRITTEN)
5511 out[cur_ext].bmv_oflags |= BMV_OF_PREALLOC;
5512 else if (map[i].br_startblock == DELAYSTARTBLOCK)
5513 out[cur_ext].bmv_oflags |= BMV_OF_DELALLOC;
5514 out[cur_ext].bmv_offset =
5515 XFS_FSB_TO_BB(mp, map[i].br_startoff);
5516 out[cur_ext].bmv_length =
5517 XFS_FSB_TO_BB(mp, map[i].br_blockcount);
5518 out[cur_ext].bmv_unused1 = 0;
5519 out[cur_ext].bmv_unused2 = 0;
5520 ASSERT(((iflags & BMV_IF_DELALLOC) != 0) ||
5521 (map[i].br_startblock != DELAYSTARTBLOCK));
5522 if (map[i].br_startblock == HOLESTARTBLOCK &&
5523 whichfork == XFS_ATTR_FORK) {
5524 /* came to the end of attribute fork */
5525 out[cur_ext].bmv_oflags |= BMV_OF_LAST;
5526 goto out_free_map;
5527 }
5528
5529 if (!xfs_getbmapx_fix_eof_hole(ip, &out[cur_ext],
5530 prealloced, bmvend,
5531 map[i].br_startblock))
5532 goto out_free_map;
5533
5534 bmv->bmv_offset =
5535 out[cur_ext].bmv_offset +
5536 out[cur_ext].bmv_length;
5537 bmv->bmv_length =
5538 max_t(__int64_t, 0, bmvend - bmv->bmv_offset);
5539
5540 /*
5541 * In case we don't want to return the hole,
5542 * don't increase cur_ext so that we can reuse
5543 * it in the next loop.
5544 */
5545 if ((iflags & BMV_IF_NO_HOLES) &&
5546 map[i].br_startblock == HOLESTARTBLOCK) {
5547 memset(&out[cur_ext], 0, sizeof(out[cur_ext]));
5548 continue;
5549 }
5550
5551 nexleft--;
5552 bmv->bmv_entries++;
5553 cur_ext++;
5554 }
5555 } while (nmap && nexleft && bmv->bmv_length);
5556
5557 out_free_map:
5558 kmem_free(map);
5559 out_unlock_ilock:
5560 xfs_iunlock_map_shared(ip, lock);
5561 out_unlock_iolock:
5562 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
5563
5564 for (i = 0; i < cur_ext; i++) {
5565 int full = 0; /* user array is full */
5566
5567 /* format results & advance arg */
5568 error = formatter(&arg, &out[i], &full);
5569 if (error || full)
5570 break;
5571 }
5572
5573 kmem_free(out);
5574 return error;
5575 }
5576
5577 /*
5578 * Check the last inode extent to determine whether this allocation will result
5579 * in blocks being allocated at the end of the file. When we allocate new data
5580 * blocks at the end of the file which do not start at the previous data block,
5581 * we will try to align the new blocks at stripe unit boundaries.
5582 */
5583 STATIC int /* error */
5584 xfs_bmap_isaeof(
5585 xfs_inode_t *ip, /* incore inode pointer */
5586 xfs_fileoff_t off, /* file offset in fsblocks */
5587 int whichfork, /* data or attribute fork */
5588 char *aeof) /* return value */
5589 {
5590 int error; /* error return value */
5591 xfs_ifork_t *ifp; /* inode fork pointer */
5592 xfs_bmbt_rec_host_t *lastrec; /* extent record pointer */
5593 xfs_extnum_t nextents; /* number of file extents */
5594 xfs_bmbt_irec_t s; /* expanded extent record */
5595
5596 ASSERT(whichfork == XFS_DATA_FORK);
5597 ifp = XFS_IFORK_PTR(ip, whichfork);
5598 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5599 (error = xfs_iread_extents(NULL, ip, whichfork)))
5600 return error;
5601 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5602 if (nextents == 0) {
5603 *aeof = 1;
5604 return 0;
5605 }
5606 /*
5607 * Go to the last extent
5608 */
5609 lastrec = xfs_iext_get_ext(ifp, nextents - 1);
5610 xfs_bmbt_get_all(lastrec, &s);
5611 /*
5612 * Check we are allocating in the last extent (for delayed allocations)
5613 * or past the last extent for non-delayed allocations.
5614 */
5615 *aeof = (off >= s.br_startoff &&
5616 off < s.br_startoff + s.br_blockcount &&
5617 isnullstartblock(s.br_startblock)) ||
5618 off >= s.br_startoff + s.br_blockcount;
5619 return 0;
5620 }
5621
5622 /*
5623 * Check if the endoff is outside the last extent. If so the caller will grow
5624 * the allocation to a stripe unit boundary.
5625 */
5626 int /* error */
5627 xfs_bmap_eof(
5628 xfs_inode_t *ip, /* incore inode pointer */
5629 xfs_fileoff_t endoff, /* file offset in fsblocks */
5630 int whichfork, /* data or attribute fork */
5631 int *eof) /* result value */
5632 {
5633 xfs_fsblock_t blockcount; /* extent block count */
5634 int error; /* error return value */
5635 xfs_ifork_t *ifp; /* inode fork pointer */
5636 xfs_bmbt_rec_host_t *lastrec; /* extent record pointer */
5637 xfs_extnum_t nextents; /* number of file extents */
5638 xfs_fileoff_t startoff; /* extent starting file offset */
5639
5640 ASSERT(whichfork == XFS_DATA_FORK);
5641 ifp = XFS_IFORK_PTR(ip, whichfork);
5642 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5643 (error = xfs_iread_extents(NULL, ip, whichfork)))
5644 return error;
5645 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5646 if (nextents == 0) {
5647 *eof = 1;
5648 return 0;
5649 }
5650 /*
5651 * Go to the last extent
5652 */
5653 lastrec = xfs_iext_get_ext(ifp, nextents - 1);
5654 startoff = xfs_bmbt_get_startoff(lastrec);
5655 blockcount = xfs_bmbt_get_blockcount(lastrec);
5656 *eof = endoff >= startoff + blockcount;
5657 return 0;
5658 }
5659
5660 #ifdef DEBUG
5661 STATIC struct xfs_buf *
5662 xfs_bmap_get_bp(
5663 struct xfs_btree_cur *cur,
5664 xfs_fsblock_t bno)
5665 {
5666 struct xfs_log_item_desc *lidp;
5667 int i;
5668
5669 if (!cur)
5670 return NULL;
5671
5672 for (i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
5673 if (!cur->bc_bufs[i])
5674 break;
5675 if (XFS_BUF_ADDR(cur->bc_bufs[i]) == bno)
5676 return cur->bc_bufs[i];
5677 }
5678
5679 /* Chase down all the log items to see if the bp is there */
5680 list_for_each_entry(lidp, &cur->bc_tp->t_items, lid_trans) {
5681 struct xfs_buf_log_item *bip;
5682 bip = (struct xfs_buf_log_item *)lidp->lid_item;
5683 if (bip->bli_item.li_type == XFS_LI_BUF &&
5684 XFS_BUF_ADDR(bip->bli_buf) == bno)
5685 return bip->bli_buf;
5686 }
5687
5688 return NULL;
5689 }
5690
5691 STATIC void
5692 xfs_check_block(
5693 struct xfs_btree_block *block,
5694 xfs_mount_t *mp,
5695 int root,
5696 short sz)
5697 {
5698 int i, j, dmxr;
5699 __be64 *pp, *thispa; /* pointer to block address */
5700 xfs_bmbt_key_t *prevp, *keyp;
5701
5702 ASSERT(be16_to_cpu(block->bb_level) > 0);
5703
5704 prevp = NULL;
5705 for( i = 1; i <= xfs_btree_get_numrecs(block); i++) {
5706 dmxr = mp->m_bmap_dmxr[0];
5707 keyp = XFS_BMBT_KEY_ADDR(mp, block, i);
5708
5709 if (prevp) {
5710 ASSERT(be64_to_cpu(prevp->br_startoff) <
5711 be64_to_cpu(keyp->br_startoff));
5712 }
5713 prevp = keyp;
5714
5715 /*
5716 * Compare the block numbers to see if there are dups.
5717 */
5718 if (root)
5719 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, i, sz);
5720 else
5721 pp = XFS_BMBT_PTR_ADDR(mp, block, i, dmxr);
5722
5723 for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
5724 if (root)
5725 thispa = XFS_BMAP_BROOT_PTR_ADDR(mp, block, j, sz);
5726 else
5727 thispa = XFS_BMBT_PTR_ADDR(mp, block, j, dmxr);
5728 if (*thispa == *pp) {
5729 xfs_warn(mp, "%s: thispa(%d) == pp(%d) %Ld",
5730 __func__, j, i,
5731 (unsigned long long)be64_to_cpu(*thispa));
5732 panic("%s: ptrs are equal in node\n",
5733 __func__);
5734 }
5735 }
5736 }
5737 }
5738
5739 /*
5740 * Check that the extents for the inode ip are in the right order in all
5741 * btree leaves.
5742 */
5743
5744 STATIC void
5745 xfs_bmap_check_leaf_extents(
5746 xfs_btree_cur_t *cur, /* btree cursor or null */
5747 xfs_inode_t *ip, /* incore inode pointer */
5748 int whichfork) /* data or attr fork */
5749 {
5750 struct xfs_btree_block *block; /* current btree block */
5751 xfs_fsblock_t bno; /* block # of "block" */
5752 xfs_buf_t *bp; /* buffer for "block" */
5753 int error; /* error return value */
5754 xfs_extnum_t i=0, j; /* index into the extents list */
5755 xfs_ifork_t *ifp; /* fork structure */
5756 int level; /* btree level, for checking */
5757 xfs_mount_t *mp; /* file system mount structure */
5758 __be64 *pp; /* pointer to block address */
5759 xfs_bmbt_rec_t *ep; /* pointer to current extent */
5760 xfs_bmbt_rec_t last = {0, 0}; /* last extent in prev block */
5761 xfs_bmbt_rec_t *nextp; /* pointer to next extent */
5762 int bp_release = 0;
5763
5764 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
5765 return;
5766 }
5767
5768 bno = NULLFSBLOCK;
5769 mp = ip->i_mount;
5770 ifp = XFS_IFORK_PTR(ip, whichfork);
5771 block = ifp->if_broot;
5772 /*
5773 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
5774 */
5775 level = be16_to_cpu(block->bb_level);
5776 ASSERT(level > 0);
5777 xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
5778 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
5779 bno = be64_to_cpu(*pp);
5780
5781 ASSERT(bno != NULLDFSBNO);
5782 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
5783 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
5784
5785 /*
5786 * Go down the tree until leaf level is reached, following the first
5787 * pointer (leftmost) at each level.
5788 */
5789 while (level-- > 0) {
5790 /* See if buf is in cur first */
5791 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
5792 if (bp) {
5793 bp_release = 0;
5794 } else {
5795 bp_release = 1;
5796 }
5797 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
5798 XFS_BMAP_BTREE_REF)))
5799 goto error_norelse;
5800 block = XFS_BUF_TO_BLOCK(bp);
5801 XFS_WANT_CORRUPTED_GOTO(
5802 xfs_bmap_sanity_check(mp, bp, level),
5803 error0);
5804 if (level == 0)
5805 break;
5806
5807 /*
5808 * Check this block for basic sanity (increasing keys and
5809 * no duplicate blocks).
5810 */
5811
5812 xfs_check_block(block, mp, 0, 0);
5813 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
5814 bno = be64_to_cpu(*pp);
5815 XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
5816 if (bp_release) {
5817 bp_release = 0;
5818 xfs_trans_brelse(NULL, bp);
5819 }
5820 }
5821
5822 /*
5823 * Here with bp and block set to the leftmost leaf node in the tree.
5824 */
5825 i = 0;
5826
5827 /*
5828 * Loop over all leaf nodes checking that all extents are in the right order.
5829 */
5830 for (;;) {
5831 xfs_fsblock_t nextbno;
5832 xfs_extnum_t num_recs;
5833
5834
5835 num_recs = xfs_btree_get_numrecs(block);
5836
5837 /*
5838 * Read-ahead the next leaf block, if any.
5839 */
5840
5841 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
5842
5843 /*
5844 * Check all the extents to make sure they are OK.
5845 * If we had a previous block, the last entry should
5846 * conform with the first entry in this one.
5847 */
5848
5849 ep = XFS_BMBT_REC_ADDR(mp, block, 1);
5850 if (i) {
5851 ASSERT(xfs_bmbt_disk_get_startoff(&last) +
5852 xfs_bmbt_disk_get_blockcount(&last) <=
5853 xfs_bmbt_disk_get_startoff(ep));
5854 }
5855 for (j = 1; j < num_recs; j++) {
5856 nextp = XFS_BMBT_REC_ADDR(mp, block, j + 1);
5857 ASSERT(xfs_bmbt_disk_get_startoff(ep) +
5858 xfs_bmbt_disk_get_blockcount(ep) <=
5859 xfs_bmbt_disk_get_startoff(nextp));
5860 ep = nextp;
5861 }
5862
5863 last = *ep;
5864 i += num_recs;
5865 if (bp_release) {
5866 bp_release = 0;
5867 xfs_trans_brelse(NULL, bp);
5868 }
5869 bno = nextbno;
5870 /*
5871 * If we've reached the end, stop.
5872 */
5873 if (bno == NULLFSBLOCK)
5874 break;
5875
5876 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
5877 if (bp) {
5878 bp_release = 0;
5879 } else {
5880 bp_release = 1;
5881 }
5882 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
5883 XFS_BMAP_BTREE_REF)))
5884 goto error_norelse;
5885 block = XFS_BUF_TO_BLOCK(bp);
5886 }
5887 if (bp_release) {
5888 bp_release = 0;
5889 xfs_trans_brelse(NULL, bp);
5890 }
5891 return;
5892
5893 error0:
5894 xfs_warn(mp, "%s: at error0", __func__);
5895 if (bp_release)
5896 xfs_trans_brelse(NULL, bp);
5897 error_norelse:
5898 xfs_warn(mp, "%s: BAD after btree leaves for %d extents",
5899 __func__, i);
5900 panic("%s: CORRUPTED BTREE OR SOMETHING", __func__);
5901 return;
5902 }
5903 #endif
5904
5905 /*
5906 * Count fsblocks of the given fork.
5907 */
5908 int /* error */
5909 xfs_bmap_count_blocks(
5910 xfs_trans_t *tp, /* transaction pointer */
5911 xfs_inode_t *ip, /* incore inode */
5912 int whichfork, /* data or attr fork */
5913 int *count) /* out: count of blocks */
5914 {
5915 struct xfs_btree_block *block; /* current btree block */
5916 xfs_fsblock_t bno; /* block # of "block" */
5917 xfs_ifork_t *ifp; /* fork structure */
5918 int level; /* btree level, for checking */
5919 xfs_mount_t *mp; /* file system mount structure */
5920 __be64 *pp; /* pointer to block address */
5921
5922 bno = NULLFSBLOCK;
5923 mp = ip->i_mount;
5924 ifp = XFS_IFORK_PTR(ip, whichfork);
5925 if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) {
5926 xfs_bmap_count_leaves(ifp, 0,
5927 ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t),
5928 count);
5929 return 0;
5930 }
5931
5932 /*
5933 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
5934 */
5935 block = ifp->if_broot;
5936 level = be16_to_cpu(block->bb_level);
5937 ASSERT(level > 0);
5938 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
5939 bno = be64_to_cpu(*pp);
5940 ASSERT(bno != NULLDFSBNO);
5941 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
5942 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
5943
5944 if (unlikely(xfs_bmap_count_tree(mp, tp, ifp, bno, level, count) < 0)) {
5945 XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW,
5946 mp);
5947 return XFS_ERROR(EFSCORRUPTED);
5948 }
5949
5950 return 0;
5951 }
5952
5953 /*
5954 * Recursively walks each level of a btree
5955 * to count total fsblocks is use.
5956 */
5957 STATIC int /* error */
5958 xfs_bmap_count_tree(
5959 xfs_mount_t *mp, /* file system mount point */
5960 xfs_trans_t *tp, /* transaction pointer */
5961 xfs_ifork_t *ifp, /* inode fork pointer */
5962 xfs_fsblock_t blockno, /* file system block number */
5963 int levelin, /* level in btree */
5964 int *count) /* Count of blocks */
5965 {
5966 int error;
5967 xfs_buf_t *bp, *nbp;
5968 int level = levelin;
5969 __be64 *pp;
5970 xfs_fsblock_t bno = blockno;
5971 xfs_fsblock_t nextbno;
5972 struct xfs_btree_block *block, *nextblock;
5973 int numrecs;
5974
5975 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF)))
5976 return error;
5977 *count += 1;
5978 block = XFS_BUF_TO_BLOCK(bp);
5979
5980 if (--level) {
5981 /* Not at node above leaves, count this level of nodes */
5982 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
5983 while (nextbno != NULLFSBLOCK) {
5984 if ((error = xfs_btree_read_bufl(mp, tp, nextbno,
5985 0, &nbp, XFS_BMAP_BTREE_REF)))
5986 return error;
5987 *count += 1;
5988 nextblock = XFS_BUF_TO_BLOCK(nbp);
5989 nextbno = be64_to_cpu(nextblock->bb_u.l.bb_rightsib);
5990 xfs_trans_brelse(tp, nbp);
5991 }
5992
5993 /* Dive to the next level */
5994 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
5995 bno = be64_to_cpu(*pp);
5996 if (unlikely((error =
5997 xfs_bmap_count_tree(mp, tp, ifp, bno, level, count)) < 0)) {
5998 xfs_trans_brelse(tp, bp);
5999 XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
6000 XFS_ERRLEVEL_LOW, mp);
6001 return XFS_ERROR(EFSCORRUPTED);
6002 }
6003 xfs_trans_brelse(tp, bp);
6004 } else {
6005 /* count all level 1 nodes and their leaves */
6006 for (;;) {
6007 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
6008 numrecs = be16_to_cpu(block->bb_numrecs);
6009 xfs_bmap_disk_count_leaves(mp, block, numrecs, count);
6010 xfs_trans_brelse(tp, bp);
6011 if (nextbno == NULLFSBLOCK)
6012 break;
6013 bno = nextbno;
6014 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
6015 XFS_BMAP_BTREE_REF)))
6016 return error;
6017 *count += 1;
6018 block = XFS_BUF_TO_BLOCK(bp);
6019 }
6020 }
6021 return 0;
6022 }
6023
6024 /*
6025 * Count leaf blocks given a range of extent records.
6026 */
6027 STATIC void
6028 xfs_bmap_count_leaves(
6029 xfs_ifork_t *ifp,
6030 xfs_extnum_t idx,
6031 int numrecs,
6032 int *count)
6033 {
6034 int b;
6035
6036 for (b = 0; b < numrecs; b++) {
6037 xfs_bmbt_rec_host_t *frp = xfs_iext_get_ext(ifp, idx + b);
6038 *count += xfs_bmbt_get_blockcount(frp);
6039 }
6040 }
6041
6042 /*
6043 * Count leaf blocks given a range of extent records originally
6044 * in btree format.
6045 */
6046 STATIC void
6047 xfs_bmap_disk_count_leaves(
6048 struct xfs_mount *mp,
6049 struct xfs_btree_block *block,
6050 int numrecs,
6051 int *count)
6052 {
6053 int b;
6054 xfs_bmbt_rec_t *frp;
6055
6056 for (b = 1; b <= numrecs; b++) {
6057 frp = XFS_BMBT_REC_ADDR(mp, block, b);
6058 *count += xfs_bmbt_disk_get_blockcount(frp);
6059 }
6060 }
6061
6062 /*
6063 * dead simple method of punching delalyed allocation blocks from a range in
6064 * the inode. Walks a block at a time so will be slow, but is only executed in
6065 * rare error cases so the overhead is not critical. This will alays punch out
6066 * both the start and end blocks, even if the ranges only partially overlap
6067 * them, so it is up to the caller to ensure that partial blocks are not
6068 * passed in.
6069 */
6070 int
6071 xfs_bmap_punch_delalloc_range(
6072 struct xfs_inode *ip,
6073 xfs_fileoff_t start_fsb,
6074 xfs_fileoff_t length)
6075 {
6076 xfs_fileoff_t remaining = length;
6077 int error = 0;
6078
6079 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
6080
6081 do {
6082 int done;
6083 xfs_bmbt_irec_t imap;
6084 int nimaps = 1;
6085 xfs_fsblock_t firstblock;
6086 xfs_bmap_free_t flist;
6087
6088 /*
6089 * Map the range first and check that it is a delalloc extent
6090 * before trying to unmap the range. Otherwise we will be
6091 * trying to remove a real extent (which requires a
6092 * transaction) or a hole, which is probably a bad idea...
6093 */
6094 error = xfs_bmapi(NULL, ip, start_fsb, 1,
6095 XFS_BMAPI_ENTIRE, NULL, 0, &imap,
6096 &nimaps, NULL);
6097
6098 if (error) {
6099 /* something screwed, just bail */
6100 if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
6101 xfs_alert(ip->i_mount,
6102 "Failed delalloc mapping lookup ino %lld fsb %lld.",
6103 ip->i_ino, start_fsb);
6104 }
6105 break;
6106 }
6107 if (!nimaps) {
6108 /* nothing there */
6109 goto next_block;
6110 }
6111 if (imap.br_startblock != DELAYSTARTBLOCK) {
6112 /* been converted, ignore */
6113 goto next_block;
6114 }
6115 WARN_ON(imap.br_blockcount == 0);
6116
6117 /*
6118 * Note: while we initialise the firstblock/flist pair, they
6119 * should never be used because blocks should never be
6120 * allocated or freed for a delalloc extent and hence we need
6121 * don't cancel or finish them after the xfs_bunmapi() call.
6122 */
6123 xfs_bmap_init(&flist, &firstblock);
6124 error = xfs_bunmapi(NULL, ip, start_fsb, 1, 0, 1, &firstblock,
6125 &flist, &done);
6126 if (error)
6127 break;
6128
6129 ASSERT(!flist.xbf_count && !flist.xbf_first);
6130 next_block:
6131 start_fsb++;
6132 remaining--;
6133 } while(remaining > 0);
6134
6135 return error;
6136 }
Linux kernel - Deliverables
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