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kvm tools, setup: Create private directory
[linux-2.6/next.git] / fs / xfs / xfs_bmap.c
blobe546a33214c93b9d6d4e9e75450451c8592b40aa
1 /*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_inum.h"
24 #include "xfs_trans.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_dir2.h"
28 #include "xfs_da_btree.h"
29 #include "xfs_bmap_btree.h"
30 #include "xfs_alloc_btree.h"
31 #include "xfs_ialloc_btree.h"
32 #include "xfs_dir2_sf.h"
33 #include "xfs_dinode.h"
34 #include "xfs_inode.h"
35 #include "xfs_btree.h"
36 #include "xfs_mount.h"
37 #include "xfs_itable.h"
38 #include "xfs_dir2_data.h"
39 #include "xfs_dir2_leaf.h"
40 #include "xfs_dir2_block.h"
41 #include "xfs_inode_item.h"
42 #include "xfs_extfree_item.h"
43 #include "xfs_alloc.h"
44 #include "xfs_bmap.h"
45 #include "xfs_rtalloc.h"
46 #include "xfs_error.h"
47 #include "xfs_attr_leaf.h"
48 #include "xfs_rw.h"
49 #include "xfs_quota.h"
50 #include "xfs_trans_space.h"
51 #include "xfs_buf_item.h"
52 #include "xfs_filestream.h"
53 #include "xfs_vnodeops.h"
54 #include "xfs_trace.h"
55
56
57 #ifdef DEBUG
58 STATIC void
59 xfs_bmap_check_leaf_extents(xfs_btree_cur_t *cur, xfs_inode_t *ip, int whichfork);
60 #endif
61
62 kmem_zone_t *xfs_bmap_free_item_zone;
63
64 /*
65 * Prototypes for internal bmap routines.
66 */
67
68
69 /*
70 * Called from xfs_bmap_add_attrfork to handle extents format files.
71 */
72 STATIC int /* error */
73 xfs_bmap_add_attrfork_extents(
74 xfs_trans_t *tp, /* transaction pointer */
75 xfs_inode_t *ip, /* incore inode pointer */
76 xfs_fsblock_t *firstblock, /* first block allocated */
77 xfs_bmap_free_t *flist, /* blocks to free at commit */
78 int *flags); /* inode logging flags */
79
80 /*
81 * Called from xfs_bmap_add_attrfork to handle local format files.
82 */
83 STATIC int /* error */
84 xfs_bmap_add_attrfork_local(
85 xfs_trans_t *tp, /* transaction pointer */
86 xfs_inode_t *ip, /* incore inode pointer */
87 xfs_fsblock_t *firstblock, /* first block allocated */
88 xfs_bmap_free_t *flist, /* blocks to free at commit */
89 int *flags); /* inode logging flags */
90
91 /*
92 * Called by xfs_bmap_add_extent to handle cases converting a delayed
93 * allocation to a real allocation.
94 */
95 STATIC int /* error */
96 xfs_bmap_add_extent_delay_real(
97 xfs_inode_t *ip, /* incore inode pointer */
98 xfs_extnum_t *idx, /* extent number to update/insert */
99 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
100 xfs_bmbt_irec_t *new, /* new data to add to file extents */
101 xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
102 xfs_fsblock_t *first, /* pointer to firstblock variable */
103 xfs_bmap_free_t *flist, /* list of extents to be freed */
104 int *logflagsp); /* inode logging flags */
105
106 /*
107 * Called by xfs_bmap_add_extent to handle cases converting a hole
108 * to a delayed allocation.
109 */
110 STATIC int /* error */
111 xfs_bmap_add_extent_hole_delay(
112 xfs_inode_t *ip, /* incore inode pointer */
113 xfs_extnum_t *idx, /* extent number to update/insert */
114 xfs_bmbt_irec_t *new, /* new data to add to file extents */
115 int *logflagsp); /* inode logging flags */
116
117 /*
118 * Called by xfs_bmap_add_extent to handle cases converting a hole
119 * to a real allocation.
120 */
121 STATIC int /* error */
122 xfs_bmap_add_extent_hole_real(
123 xfs_inode_t *ip, /* incore inode pointer */
124 xfs_extnum_t *idx, /* extent number to update/insert */
125 xfs_btree_cur_t *cur, /* if null, not a btree */
126 xfs_bmbt_irec_t *new, /* new data to add to file extents */
127 int *logflagsp, /* inode logging flags */
128 int whichfork); /* data or attr fork */
129
130 /*
131 * Called by xfs_bmap_add_extent to handle cases converting an unwritten
132 * allocation to a real allocation or vice versa.
133 */
134 STATIC int /* error */
135 xfs_bmap_add_extent_unwritten_real(
136 xfs_inode_t *ip, /* incore inode pointer */
137 xfs_extnum_t *idx, /* extent number to update/insert */
138 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
139 xfs_bmbt_irec_t *new, /* new data to add to file extents */
140 int *logflagsp); /* inode logging flags */
141
142 /*
143 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
144 * It figures out where to ask the underlying allocator to put the new extent.
145 */
146 STATIC int /* error */
147 xfs_bmap_alloc(
148 xfs_bmalloca_t *ap); /* bmap alloc argument struct */
149
150 /*
151 * Transform a btree format file with only one leaf node, where the
152 * extents list will fit in the inode, into an extents format file.
153 * Since the file extents are already in-core, all we have to do is
154 * give up the space for the btree root and pitch the leaf block.
155 */
156 STATIC int /* error */
157 xfs_bmap_btree_to_extents(
158 xfs_trans_t *tp, /* transaction pointer */
159 xfs_inode_t *ip, /* incore inode pointer */
160 xfs_btree_cur_t *cur, /* btree cursor */
161 int *logflagsp, /* inode logging flags */
162 int whichfork); /* data or attr fork */
163
164 /*
165 * Remove the entry "free" from the free item list. Prev points to the
166 * previous entry, unless "free" is the head of the list.
167 */
168 STATIC void
169 xfs_bmap_del_free(
170 xfs_bmap_free_t *flist, /* free item list header */
171 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
172 xfs_bmap_free_item_t *free); /* list item to be freed */
173
174 /*
175 * Convert an extents-format file into a btree-format file.
176 * The new file will have a root block (in the inode) and a single child block.
177 */
178 STATIC int /* error */
179 xfs_bmap_extents_to_btree(
180 xfs_trans_t *tp, /* transaction pointer */
181 xfs_inode_t *ip, /* incore inode pointer */
182 xfs_fsblock_t *firstblock, /* first-block-allocated */
183 xfs_bmap_free_t *flist, /* blocks freed in xaction */
184 xfs_btree_cur_t **curp, /* cursor returned to caller */
185 int wasdel, /* converting a delayed alloc */
186 int *logflagsp, /* inode logging flags */
187 int whichfork); /* data or attr fork */
188
189 /*
190 * Convert a local file to an extents file.
191 * This code is sort of bogus, since the file data needs to get
192 * logged so it won't be lost. The bmap-level manipulations are ok, though.
193 */
194 STATIC int /* error */
195 xfs_bmap_local_to_extents(
196 xfs_trans_t *tp, /* transaction pointer */
197 xfs_inode_t *ip, /* incore inode pointer */
198 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
199 xfs_extlen_t total, /* total blocks needed by transaction */
200 int *logflagsp, /* inode logging flags */
201 int whichfork); /* data or attr fork */
202
203 /*
204 * Search the extents list for the inode, for the extent containing bno.
205 * If bno lies in a hole, point to the next entry. If bno lies past eof,
206 * *eofp will be set, and *prevp will contain the last entry (null if none).
207 * Else, *lastxp will be set to the index of the found
208 * entry; *gotp will contain the entry.
209 */
210 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
211 xfs_bmap_search_extents(
212 xfs_inode_t *ip, /* incore inode pointer */
213 xfs_fileoff_t bno, /* block number searched for */
214 int whichfork, /* data or attr fork */
215 int *eofp, /* out: end of file found */
216 xfs_extnum_t *lastxp, /* out: last extent index */
217 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
218 xfs_bmbt_irec_t *prevp); /* out: previous extent entry found */
219
220 /*
221 * Check the last inode extent to determine whether this allocation will result
222 * in blocks being allocated at the end of the file. When we allocate new data
223 * blocks at the end of the file which do not start at the previous data block,
224 * we will try to align the new blocks at stripe unit boundaries.
225 */
226 STATIC int /* error */
227 xfs_bmap_isaeof(
228 xfs_inode_t *ip, /* incore inode pointer */
229 xfs_fileoff_t off, /* file offset in fsblocks */
230 int whichfork, /* data or attribute fork */
231 char *aeof); /* return value */
232
233 /*
234 * Compute the worst-case number of indirect blocks that will be used
235 * for ip's delayed extent of length "len".
236 */
237 STATIC xfs_filblks_t
238 xfs_bmap_worst_indlen(
239 xfs_inode_t *ip, /* incore inode pointer */
240 xfs_filblks_t len); /* delayed extent length */
241
242 #ifdef DEBUG
243 /*
244 * Perform various validation checks on the values being returned
245 * from xfs_bmapi().
246 */
247 STATIC void
248 xfs_bmap_validate_ret(
249 xfs_fileoff_t bno,
250 xfs_filblks_t len,
251 int flags,
252 xfs_bmbt_irec_t *mval,
253 int nmap,
254 int ret_nmap);
255 #else
256 #define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
257 #endif /* DEBUG */
258
259 STATIC int
260 xfs_bmap_count_tree(
261 xfs_mount_t *mp,
262 xfs_trans_t *tp,
263 xfs_ifork_t *ifp,
264 xfs_fsblock_t blockno,
265 int levelin,
266 int *count);
267
268 STATIC void
269 xfs_bmap_count_leaves(
270 xfs_ifork_t *ifp,
271 xfs_extnum_t idx,
272 int numrecs,
273 int *count);
274
275 STATIC void
276 xfs_bmap_disk_count_leaves(
277 struct xfs_mount *mp,
278 struct xfs_btree_block *block,
279 int numrecs,
280 int *count);
281
282 /*
283 * Bmap internal routines.
284 */
285
286 STATIC int /* error */
287 xfs_bmbt_lookup_eq(
288 struct xfs_btree_cur *cur,
289 xfs_fileoff_t off,
290 xfs_fsblock_t bno,
291 xfs_filblks_t len,
292 int *stat) /* success/failure */
293 {
294 cur->bc_rec.b.br_startoff = off;
295 cur->bc_rec.b.br_startblock = bno;
296 cur->bc_rec.b.br_blockcount = len;
297 return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
298 }
299
300 STATIC int /* error */
301 xfs_bmbt_lookup_ge(
302 struct xfs_btree_cur *cur,
303 xfs_fileoff_t off,
304 xfs_fsblock_t bno,
305 xfs_filblks_t len,
306 int *stat) /* success/failure */
307 {
308 cur->bc_rec.b.br_startoff = off;
309 cur->bc_rec.b.br_startblock = bno;
310 cur->bc_rec.b.br_blockcount = len;
311 return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
312 }
313
314 /*
315 * Update the record referred to by cur to the value given
316 * by [off, bno, len, state].
317 * This either works (return 0) or gets an EFSCORRUPTED error.
318 */
319 STATIC int
320 xfs_bmbt_update(
321 struct xfs_btree_cur *cur,
322 xfs_fileoff_t off,
323 xfs_fsblock_t bno,
324 xfs_filblks_t len,
325 xfs_exntst_t state)
326 {
327 union xfs_btree_rec rec;
328
329 xfs_bmbt_disk_set_allf(&rec.bmbt, off, bno, len, state);
330 return xfs_btree_update(cur, &rec);
331 }
332
333 /*
334 * Called from xfs_bmap_add_attrfork to handle btree format files.
335 */
336 STATIC int /* error */
337 xfs_bmap_add_attrfork_btree(
338 xfs_trans_t *tp, /* transaction pointer */
339 xfs_inode_t *ip, /* incore inode pointer */
340 xfs_fsblock_t *firstblock, /* first block allocated */
341 xfs_bmap_free_t *flist, /* blocks to free at commit */
342 int *flags) /* inode logging flags */
343 {
344 xfs_btree_cur_t *cur; /* btree cursor */
345 int error; /* error return value */
346 xfs_mount_t *mp; /* file system mount struct */
347 int stat; /* newroot status */
348
349 mp = ip->i_mount;
350 if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
351 *flags |= XFS_ILOG_DBROOT;
352 else {
353 cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
354 cur->bc_private.b.flist = flist;
355 cur->bc_private.b.firstblock = *firstblock;
356 if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
357 goto error0;
358 /* must be at least one entry */
359 XFS_WANT_CORRUPTED_GOTO(stat == 1, error0);
360 if ((error = xfs_btree_new_iroot(cur, flags, &stat)))
361 goto error0;
362 if (stat == 0) {
363 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
364 return XFS_ERROR(ENOSPC);
365 }
366 *firstblock = cur->bc_private.b.firstblock;
367 cur->bc_private.b.allocated = 0;
368 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
369 }
370 return 0;
371 error0:
372 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
373 return error;
374 }
375
376 /*
377 * Called from xfs_bmap_add_attrfork to handle extents format files.
378 */
379 STATIC int /* error */
380 xfs_bmap_add_attrfork_extents(
381 xfs_trans_t *tp, /* transaction pointer */
382 xfs_inode_t *ip, /* incore inode pointer */
383 xfs_fsblock_t *firstblock, /* first block allocated */
384 xfs_bmap_free_t *flist, /* blocks to free at commit */
385 int *flags) /* inode logging flags */
386 {
387 xfs_btree_cur_t *cur; /* bmap btree cursor */
388 int error; /* error return value */
389
390 if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
391 return 0;
392 cur = NULL;
393 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist, &cur, 0,
394 flags, XFS_DATA_FORK);
395 if (cur) {
396 cur->bc_private.b.allocated = 0;
397 xfs_btree_del_cursor(cur,
398 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
399 }
400 return error;
401 }
402
403 /*
404 * Called from xfs_bmap_add_attrfork to handle local format files.
405 */
406 STATIC int /* error */
407 xfs_bmap_add_attrfork_local(
408 xfs_trans_t *tp, /* transaction pointer */
409 xfs_inode_t *ip, /* incore inode pointer */
410 xfs_fsblock_t *firstblock, /* first block allocated */
411 xfs_bmap_free_t *flist, /* blocks to free at commit */
412 int *flags) /* inode logging flags */
413 {
414 xfs_da_args_t dargs; /* args for dir/attr code */
415 int error; /* error return value */
416 xfs_mount_t *mp; /* mount structure pointer */
417
418 if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
419 return 0;
420 if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
421 mp = ip->i_mount;
422 memset(&dargs, 0, sizeof(dargs));
423 dargs.dp = ip;
424 dargs.firstblock = firstblock;
425 dargs.flist = flist;
426 dargs.total = mp->m_dirblkfsbs;
427 dargs.whichfork = XFS_DATA_FORK;
428 dargs.trans = tp;
429 error = xfs_dir2_sf_to_block(&dargs);
430 } else
431 error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
432 XFS_DATA_FORK);
433 return error;
434 }
435
436 /*
437 * Called by xfs_bmapi to update file extent records and the btree
438 * after allocating space (or doing a delayed allocation).
439 */
440 STATIC int /* error */
441 xfs_bmap_add_extent(
442 xfs_inode_t *ip, /* incore inode pointer */
443 xfs_extnum_t *idx, /* extent number to update/insert */
444 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
445 xfs_bmbt_irec_t *new, /* new data to add to file extents */
446 xfs_fsblock_t *first, /* pointer to firstblock variable */
447 xfs_bmap_free_t *flist, /* list of extents to be freed */
448 int *logflagsp, /* inode logging flags */
449 int whichfork) /* data or attr fork */
450 {
451 xfs_btree_cur_t *cur; /* btree cursor or null */
452 xfs_filblks_t da_new; /* new count del alloc blocks used */
453 xfs_filblks_t da_old; /* old count del alloc blocks used */
454 int error; /* error return value */
455 xfs_ifork_t *ifp; /* inode fork ptr */
456 int logflags; /* returned value */
457 xfs_extnum_t nextents; /* number of extents in file now */
458
459 XFS_STATS_INC(xs_add_exlist);
460
461 cur = *curp;
462 ifp = XFS_IFORK_PTR(ip, whichfork);
463 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
464 da_old = da_new = 0;
465 error = 0;
466
467 ASSERT(*idx >= 0);
468 ASSERT(*idx <= nextents);
469
470 /*
471 * This is the first extent added to a new/empty file.
472 * Special case this one, so other routines get to assume there are
473 * already extents in the list.
474 */
475 if (nextents == 0) {
476 xfs_iext_insert(ip, *idx, 1, new,
477 whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0);
478
479 ASSERT(cur == NULL);
480
481 if (!isnullstartblock(new->br_startblock)) {
482 XFS_IFORK_NEXT_SET(ip, whichfork, 1);
483 logflags = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
484 } else
485 logflags = 0;
486 }
487 /*
488 * Any kind of new delayed allocation goes here.
489 */
490 else if (isnullstartblock(new->br_startblock)) {
491 if (cur)
492 ASSERT((cur->bc_private.b.flags &
493 XFS_BTCUR_BPRV_WASDEL) == 0);
494 error = xfs_bmap_add_extent_hole_delay(ip, idx, new,
495 &logflags);
496 }
497 /*
498 * Real allocation off the end of the file.
499 */
500 else if (*idx == nextents) {
501 if (cur)
502 ASSERT((cur->bc_private.b.flags &
503 XFS_BTCUR_BPRV_WASDEL) == 0);
504 error = xfs_bmap_add_extent_hole_real(ip, idx, cur, new,
505 &logflags, whichfork);
506 } else {
507 xfs_bmbt_irec_t prev; /* old extent at offset idx */
508
509 /*
510 * Get the record referred to by idx.
511 */
512 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &prev);
513 /*
514 * If it's a real allocation record, and the new allocation ends
515 * after the start of the referred to record, then we're filling
516 * in a delayed or unwritten allocation with a real one, or
517 * converting real back to unwritten.
518 */
519 if (!isnullstartblock(new->br_startblock) &&
520 new->br_startoff + new->br_blockcount > prev.br_startoff) {
521 if (prev.br_state != XFS_EXT_UNWRITTEN &&
522 isnullstartblock(prev.br_startblock)) {
523 da_old = startblockval(prev.br_startblock);
524 if (cur)
525 ASSERT(cur->bc_private.b.flags &
526 XFS_BTCUR_BPRV_WASDEL);
527 error = xfs_bmap_add_extent_delay_real(ip,
528 idx, &cur, new, &da_new,
529 first, flist, &logflags);
530 } else {
531 ASSERT(new->br_state == XFS_EXT_NORM ||
532 new->br_state == XFS_EXT_UNWRITTEN);
533
534 error = xfs_bmap_add_extent_unwritten_real(ip,
535 idx, &cur, new, &logflags);
536 if (error)
537 goto done;
538 }
539 }
540 /*
541 * Otherwise we're filling in a hole with an allocation.
542 */
543 else {
544 if (cur)
545 ASSERT((cur->bc_private.b.flags &
546 XFS_BTCUR_BPRV_WASDEL) == 0);
547 error = xfs_bmap_add_extent_hole_real(ip, idx, cur,
548 new, &logflags, whichfork);
549 }
550 }
551
552 if (error)
553 goto done;
554 ASSERT(*curp == cur || *curp == NULL);
555
556 /*
557 * Convert to a btree if necessary.
558 */
559 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
560 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
561 int tmp_logflags; /* partial log flag return val */
562
563 ASSERT(cur == NULL);
564 error = xfs_bmap_extents_to_btree(ip->i_transp, ip, first,
565 flist, &cur, da_old > 0, &tmp_logflags, whichfork);
566 logflags |= tmp_logflags;
567 if (error)
568 goto done;
569 }
570 /*
571 * Adjust for changes in reserved delayed indirect blocks.
572 * Nothing to do for disk quotas here.
573 */
574 if (da_old || da_new) {
575 xfs_filblks_t nblks;
576
577 nblks = da_new;
578 if (cur)
579 nblks += cur->bc_private.b.allocated;
580 ASSERT(nblks <= da_old);
581 if (nblks < da_old)
582 xfs_icsb_modify_counters(ip->i_mount, XFS_SBS_FDBLOCKS,
583 (int64_t)(da_old - nblks), 0);
584 }
585 /*
586 * Clear out the allocated field, done with it now in any case.
587 */
588 if (cur) {
589 cur->bc_private.b.allocated = 0;
590 *curp = cur;
591 }
592 done:
593 #ifdef DEBUG
594 if (!error)
595 xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
596 #endif
597 *logflagsp = logflags;
598 return error;
599 }
600
601 /*
602 * Called by xfs_bmap_add_extent to handle cases converting a delayed
603 * allocation to a real allocation.
604 */
605 STATIC int /* error */
606 xfs_bmap_add_extent_delay_real(
607 xfs_inode_t *ip, /* incore inode pointer */
608 xfs_extnum_t *idx, /* extent number to update/insert */
609 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
610 xfs_bmbt_irec_t *new, /* new data to add to file extents */
611 xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
612 xfs_fsblock_t *first, /* pointer to firstblock variable */
613 xfs_bmap_free_t *flist, /* list of extents to be freed */
614 int *logflagsp) /* inode logging flags */
615 {
616 xfs_btree_cur_t *cur; /* btree cursor */
617 int diff; /* temp value */
618 xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
619 int error; /* error return value */
620 int i; /* temp state */
621 xfs_ifork_t *ifp; /* inode fork pointer */
622 xfs_fileoff_t new_endoff; /* end offset of new entry */
623 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
624 /* left is 0, right is 1, prev is 2 */
625 int rval=0; /* return value (logging flags) */
626 int state = 0;/* state bits, accessed thru macros */
627 xfs_filblks_t temp=0; /* value for dnew calculations */
628 xfs_filblks_t temp2=0;/* value for dnew calculations */
629 int tmp_rval; /* partial logging flags */
630
631 #define LEFT r[0]
632 #define RIGHT r[1]
633 #define PREV r[2]
634
635 /*
636 * Set up a bunch of variables to make the tests simpler.
637 */
638 cur = *curp;
639 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
640 ep = xfs_iext_get_ext(ifp, *idx);
641 xfs_bmbt_get_all(ep, &PREV);
642 new_endoff = new->br_startoff + new->br_blockcount;
643 ASSERT(PREV.br_startoff <= new->br_startoff);
644 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
645
646 /*
647 * Set flags determining what part of the previous delayed allocation
648 * extent is being replaced by a real allocation.
649 */
650 if (PREV.br_startoff == new->br_startoff)
651 state |= BMAP_LEFT_FILLING;
652 if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
653 state |= BMAP_RIGHT_FILLING;
654
655 /*
656 * Check and set flags if this segment has a left neighbor.
657 * Don't set contiguous if the combined extent would be too large.
658 */
659 if (*idx > 0) {
660 state |= BMAP_LEFT_VALID;
661 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &LEFT);
662
663 if (isnullstartblock(LEFT.br_startblock))
664 state |= BMAP_LEFT_DELAY;
665 }
666
667 if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
668 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
669 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
670 LEFT.br_state == new->br_state &&
671 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
672 state |= BMAP_LEFT_CONTIG;
673
674 /*
675 * Check and set flags if this segment has a right neighbor.
676 * Don't set contiguous if the combined extent would be too large.
677 * Also check for all-three-contiguous being too large.
678 */
679 if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
680 state |= BMAP_RIGHT_VALID;
681 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx + 1), &RIGHT);
682
683 if (isnullstartblock(RIGHT.br_startblock))
684 state |= BMAP_RIGHT_DELAY;
685 }
686
687 if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
688 new_endoff == RIGHT.br_startoff &&
689 new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
690 new->br_state == RIGHT.br_state &&
691 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
692 ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
693 BMAP_RIGHT_FILLING)) !=
694 (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
695 BMAP_RIGHT_FILLING) ||
696 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
697 <= MAXEXTLEN))
698 state |= BMAP_RIGHT_CONTIG;
699
700 error = 0;
701 /*
702 * Switch out based on the FILLING and CONTIG state bits.
703 */
704 switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
705 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
706 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
707 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
708 /*
709 * Filling in all of a previously delayed allocation extent.
710 * The left and right neighbors are both contiguous with new.
711 */
712 --*idx;
713 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
714 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
715 LEFT.br_blockcount + PREV.br_blockcount +
716 RIGHT.br_blockcount);
717 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
718
719 xfs_iext_remove(ip, *idx + 1, 2, state);
720 ip->i_d.di_nextents--;
721 if (cur == NULL)
722 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
723 else {
724 rval = XFS_ILOG_CORE;
725 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
726 RIGHT.br_startblock,
727 RIGHT.br_blockcount, &i)))
728 goto done;
729 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
730 if ((error = xfs_btree_delete(cur, &i)))
731 goto done;
732 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
733 if ((error = xfs_btree_decrement(cur, 0, &i)))
734 goto done;
735 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
736 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
737 LEFT.br_startblock,
738 LEFT.br_blockcount +
739 PREV.br_blockcount +
740 RIGHT.br_blockcount, LEFT.br_state)))
741 goto done;
742 }
743 *dnew = 0;
744 break;
745
746 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
747 /*
748 * Filling in all of a previously delayed allocation extent.
749 * The left neighbor is contiguous, the right is not.
750 */
751 --*idx;
752
753 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
754 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
755 LEFT.br_blockcount + PREV.br_blockcount);
756 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
757
758 xfs_iext_remove(ip, *idx + 1, 1, state);
759 if (cur == NULL)
760 rval = XFS_ILOG_DEXT;
761 else {
762 rval = 0;
763 if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
764 LEFT.br_startblock, LEFT.br_blockcount,
765 &i)))
766 goto done;
767 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
768 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
769 LEFT.br_startblock,
770 LEFT.br_blockcount +
771 PREV.br_blockcount, LEFT.br_state)))
772 goto done;
773 }
774 *dnew = 0;
775 break;
776
777 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
778 /*
779 * Filling in all of a previously delayed allocation extent.
780 * The right neighbor is contiguous, the left is not.
781 */
782 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
783 xfs_bmbt_set_startblock(ep, new->br_startblock);
784 xfs_bmbt_set_blockcount(ep,
785 PREV.br_blockcount + RIGHT.br_blockcount);
786 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
787
788 xfs_iext_remove(ip, *idx + 1, 1, state);
789 if (cur == NULL)
790 rval = XFS_ILOG_DEXT;
791 else {
792 rval = 0;
793 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
794 RIGHT.br_startblock,
795 RIGHT.br_blockcount, &i)))
796 goto done;
797 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
798 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
799 new->br_startblock,
800 PREV.br_blockcount +
801 RIGHT.br_blockcount, PREV.br_state)))
802 goto done;
803 }
804
805 *dnew = 0;
806 break;
807
808 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
809 /*
810 * Filling in all of a previously delayed allocation extent.
811 * Neither the left nor right neighbors are contiguous with
812 * the new one.
813 */
814 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
815 xfs_bmbt_set_startblock(ep, new->br_startblock);
816 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
817
818 ip->i_d.di_nextents++;
819 if (cur == NULL)
820 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
821 else {
822 rval = XFS_ILOG_CORE;
823 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
824 new->br_startblock, new->br_blockcount,
825 &i)))
826 goto done;
827 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
828 cur->bc_rec.b.br_state = XFS_EXT_NORM;
829 if ((error = xfs_btree_insert(cur, &i)))
830 goto done;
831 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
832 }
833
834 *dnew = 0;
835 break;
836
837 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
838 /*
839 * Filling in the first part of a previous delayed allocation.
840 * The left neighbor is contiguous.
841 */
842 trace_xfs_bmap_pre_update(ip, *idx - 1, state, _THIS_IP_);
843 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx - 1),
844 LEFT.br_blockcount + new->br_blockcount);
845 xfs_bmbt_set_startoff(ep,
846 PREV.br_startoff + new->br_blockcount);
847 trace_xfs_bmap_post_update(ip, *idx - 1, state, _THIS_IP_);
848
849 temp = PREV.br_blockcount - new->br_blockcount;
850 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
851 xfs_bmbt_set_blockcount(ep, temp);
852 if (cur == NULL)
853 rval = XFS_ILOG_DEXT;
854 else {
855 rval = 0;
856 if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
857 LEFT.br_startblock, LEFT.br_blockcount,
858 &i)))
859 goto done;
860 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
861 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
862 LEFT.br_startblock,
863 LEFT.br_blockcount +
864 new->br_blockcount,
865 LEFT.br_state)))
866 goto done;
867 }
868 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
869 startblockval(PREV.br_startblock));
870 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
871 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
872
873 --*idx;
874 *dnew = temp;
875 break;
876
877 case BMAP_LEFT_FILLING:
878 /*
879 * Filling in the first part of a previous delayed allocation.
880 * The left neighbor is not contiguous.
881 */
882 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
883 xfs_bmbt_set_startoff(ep, new_endoff);
884 temp = PREV.br_blockcount - new->br_blockcount;
885 xfs_bmbt_set_blockcount(ep, temp);
886 xfs_iext_insert(ip, *idx, 1, new, state);
887 ip->i_d.di_nextents++;
888 if (cur == NULL)
889 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
890 else {
891 rval = XFS_ILOG_CORE;
892 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
893 new->br_startblock, new->br_blockcount,
894 &i)))
895 goto done;
896 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
897 cur->bc_rec.b.br_state = XFS_EXT_NORM;
898 if ((error = xfs_btree_insert(cur, &i)))
899 goto done;
900 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
901 }
902 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
903 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
904 error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
905 first, flist, &cur, 1, &tmp_rval,
906 XFS_DATA_FORK);
907 rval |= tmp_rval;
908 if (error)
909 goto done;
910 }
911 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
912 startblockval(PREV.br_startblock) -
913 (cur ? cur->bc_private.b.allocated : 0));
914 ep = xfs_iext_get_ext(ifp, *idx + 1);
915 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
916 trace_xfs_bmap_post_update(ip, *idx + 1, state, _THIS_IP_);
917
918 *dnew = temp;
919 break;
920
921 case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
922 /*
923 * Filling in the last part of a previous delayed allocation.
924 * The right neighbor is contiguous with the new allocation.
925 */
926 temp = PREV.br_blockcount - new->br_blockcount;
927 trace_xfs_bmap_pre_update(ip, *idx + 1, state, _THIS_IP_);
928 xfs_bmbt_set_blockcount(ep, temp);
929 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx + 1),
930 new->br_startoff, new->br_startblock,
931 new->br_blockcount + RIGHT.br_blockcount,
932 RIGHT.br_state);
933 trace_xfs_bmap_post_update(ip, *idx + 1, state, _THIS_IP_);
934 if (cur == NULL)
935 rval = XFS_ILOG_DEXT;
936 else {
937 rval = 0;
938 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
939 RIGHT.br_startblock,
940 RIGHT.br_blockcount, &i)))
941 goto done;
942 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
943 if ((error = xfs_bmbt_update(cur, new->br_startoff,
944 new->br_startblock,
945 new->br_blockcount +
946 RIGHT.br_blockcount,
947 RIGHT.br_state)))
948 goto done;
949 }
950
951 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
952 startblockval(PREV.br_startblock));
953 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
954 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
955 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
956
957 ++*idx;
958 *dnew = temp;
959 break;
960
961 case BMAP_RIGHT_FILLING:
962 /*
963 * Filling in the last part of a previous delayed allocation.
964 * The right neighbor is not contiguous.
965 */
966 temp = PREV.br_blockcount - new->br_blockcount;
967 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
968 xfs_bmbt_set_blockcount(ep, temp);
969 xfs_iext_insert(ip, *idx + 1, 1, new, state);
970 ip->i_d.di_nextents++;
971 if (cur == NULL)
972 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
973 else {
974 rval = XFS_ILOG_CORE;
975 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
976 new->br_startblock, new->br_blockcount,
977 &i)))
978 goto done;
979 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
980 cur->bc_rec.b.br_state = XFS_EXT_NORM;
981 if ((error = xfs_btree_insert(cur, &i)))
982 goto done;
983 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
984 }
985 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
986 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
987 error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
988 first, flist, &cur, 1, &tmp_rval,
989 XFS_DATA_FORK);
990 rval |= tmp_rval;
991 if (error)
992 goto done;
993 }
994 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
995 startblockval(PREV.br_startblock) -
996 (cur ? cur->bc_private.b.allocated : 0));
997 ep = xfs_iext_get_ext(ifp, *idx);
998 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
999 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1000
1001 ++*idx;
1002 *dnew = temp;
1003 break;
1004
1005 case 0:
1006 /*
1007 * Filling in the middle part of a previous delayed allocation.
1008 * Contiguity is impossible here.
1009 * This case is avoided almost all the time.
1010 *
1011 * We start with a delayed allocation:
1012 *
1013 * +ddddddddddddddddddddddddddddddddddddddddddddddddddddddd+
1014 * PREV @ idx
1015 *
1016 * and we are allocating:
1017 * +rrrrrrrrrrrrrrrrr+
1018 * new
1019 *
1020 * and we set it up for insertion as:
1021 * +ddddddddddddddddddd+rrrrrrrrrrrrrrrrr+ddddddddddddddddd+
1022 * new
1023 * PREV @ idx LEFT RIGHT
1024 * inserted at idx + 1
1025 */
1026 temp = new->br_startoff - PREV.br_startoff;
1027 temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
1028 trace_xfs_bmap_pre_update(ip, *idx, 0, _THIS_IP_);
1029 xfs_bmbt_set_blockcount(ep, temp); /* truncate PREV */
1030 LEFT = *new;
1031 RIGHT.br_state = PREV.br_state;
1032 RIGHT.br_startblock = nullstartblock(
1033 (int)xfs_bmap_worst_indlen(ip, temp2));
1034 RIGHT.br_startoff = new_endoff;
1035 RIGHT.br_blockcount = temp2;
1036 /* insert LEFT (r[0]) and RIGHT (r[1]) at the same time */
1037 xfs_iext_insert(ip, *idx + 1, 2, &LEFT, state);
1038 ip->i_d.di_nextents++;
1039 if (cur == NULL)
1040 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1041 else {
1042 rval = XFS_ILOG_CORE;
1043 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1044 new->br_startblock, new->br_blockcount,
1045 &i)))
1046 goto done;
1047 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1048 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1049 if ((error = xfs_btree_insert(cur, &i)))
1050 goto done;
1051 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1052 }
1053 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1054 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1055 error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
1056 first, flist, &cur, 1, &tmp_rval,
1057 XFS_DATA_FORK);
1058 rval |= tmp_rval;
1059 if (error)
1060 goto done;
1061 }
1062 temp = xfs_bmap_worst_indlen(ip, temp);
1063 temp2 = xfs_bmap_worst_indlen(ip, temp2);
1064 diff = (int)(temp + temp2 - startblockval(PREV.br_startblock) -
1065 (cur ? cur->bc_private.b.allocated : 0));
1066 if (diff > 0 &&
1067 xfs_icsb_modify_counters(ip->i_mount, XFS_SBS_FDBLOCKS,
1068 -((int64_t)diff), 0)) {
1069 /*
1070 * Ick gross gag me with a spoon.
1071 */
1072 ASSERT(0); /* want to see if this ever happens! */
1073 while (diff > 0) {
1074 if (temp) {
1075 temp--;
1076 diff--;
1077 if (!diff ||
1078 !xfs_icsb_modify_counters(ip->i_mount,
1079 XFS_SBS_FDBLOCKS,
1080 -((int64_t)diff), 0))
1081 break;
1082 }
1083 if (temp2) {
1084 temp2--;
1085 diff--;
1086 if (!diff ||
1087 !xfs_icsb_modify_counters(ip->i_mount,
1088 XFS_SBS_FDBLOCKS,
1089 -((int64_t)diff), 0))
1090 break;
1091 }
1092 }
1093 }
1094 ep = xfs_iext_get_ext(ifp, *idx);
1095 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
1096 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1097 trace_xfs_bmap_pre_update(ip, *idx + 2, state, _THIS_IP_);
1098 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx + 2),
1099 nullstartblock((int)temp2));
1100 trace_xfs_bmap_post_update(ip, *idx + 2, state, _THIS_IP_);
1101
1102 ++*idx;
1103 *dnew = temp + temp2;
1104 break;
1105
1106 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1107 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1108 case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
1109 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1110 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1111 case BMAP_LEFT_CONTIG:
1112 case BMAP_RIGHT_CONTIG:
1113 /*
1114 * These cases are all impossible.
1115 */
1116 ASSERT(0);
1117 }
1118 *curp = cur;
1119 done:
1120 *logflagsp = rval;
1121 return error;
1122 #undef LEFT
1123 #undef RIGHT
1124 #undef PREV
1125 }
1126
1127 /*
1128 * Called by xfs_bmap_add_extent to handle cases converting an unwritten
1129 * allocation to a real allocation or vice versa.
1130 */
1131 STATIC int /* error */
1132 xfs_bmap_add_extent_unwritten_real(
1133 xfs_inode_t *ip, /* incore inode pointer */
1134 xfs_extnum_t *idx, /* extent number to update/insert */
1135 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
1136 xfs_bmbt_irec_t *new, /* new data to add to file extents */
1137 int *logflagsp) /* inode logging flags */
1138 {
1139 xfs_btree_cur_t *cur; /* btree cursor */
1140 xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
1141 int error; /* error return value */
1142 int i; /* temp state */
1143 xfs_ifork_t *ifp; /* inode fork pointer */
1144 xfs_fileoff_t new_endoff; /* end offset of new entry */
1145 xfs_exntst_t newext; /* new extent state */
1146 xfs_exntst_t oldext; /* old extent state */
1147 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
1148 /* left is 0, right is 1, prev is 2 */
1149 int rval=0; /* return value (logging flags) */
1150 int state = 0;/* state bits, accessed thru macros */
1151
1152 #define LEFT r[0]
1153 #define RIGHT r[1]
1154 #define PREV r[2]
1155 /*
1156 * Set up a bunch of variables to make the tests simpler.
1157 */
1158 error = 0;
1159 cur = *curp;
1160 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1161 ep = xfs_iext_get_ext(ifp, *idx);
1162 xfs_bmbt_get_all(ep, &PREV);
1163 newext = new->br_state;
1164 oldext = (newext == XFS_EXT_UNWRITTEN) ?
1165 XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
1166 ASSERT(PREV.br_state == oldext);
1167 new_endoff = new->br_startoff + new->br_blockcount;
1168 ASSERT(PREV.br_startoff <= new->br_startoff);
1169 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
1170
1171 /*
1172 * Set flags determining what part of the previous oldext allocation
1173 * extent is being replaced by a newext allocation.
1174 */
1175 if (PREV.br_startoff == new->br_startoff)
1176 state |= BMAP_LEFT_FILLING;
1177 if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
1178 state |= BMAP_RIGHT_FILLING;
1179
1180 /*
1181 * Check and set flags if this segment has a left neighbor.
1182 * Don't set contiguous if the combined extent would be too large.
1183 */
1184 if (*idx > 0) {
1185 state |= BMAP_LEFT_VALID;
1186 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &LEFT);
1187
1188 if (isnullstartblock(LEFT.br_startblock))
1189 state |= BMAP_LEFT_DELAY;
1190 }
1191
1192 if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
1193 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
1194 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
1195 LEFT.br_state == newext &&
1196 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1197 state |= BMAP_LEFT_CONTIG;
1198
1199 /*
1200 * Check and set flags if this segment has a right neighbor.
1201 * Don't set contiguous if the combined extent would be too large.
1202 * Also check for all-three-contiguous being too large.
1203 */
1204 if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
1205 state |= BMAP_RIGHT_VALID;
1206 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx + 1), &RIGHT);
1207 if (isnullstartblock(RIGHT.br_startblock))
1208 state |= BMAP_RIGHT_DELAY;
1209 }
1210
1211 if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
1212 new_endoff == RIGHT.br_startoff &&
1213 new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
1214 newext == RIGHT.br_state &&
1215 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
1216 ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
1217 BMAP_RIGHT_FILLING)) !=
1218 (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
1219 BMAP_RIGHT_FILLING) ||
1220 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
1221 <= MAXEXTLEN))
1222 state |= BMAP_RIGHT_CONTIG;
1223
1224 /*
1225 * Switch out based on the FILLING and CONTIG state bits.
1226 */
1227 switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
1228 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
1229 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
1230 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1231 /*
1232 * Setting all of a previous oldext extent to newext.
1233 * The left and right neighbors are both contiguous with new.
1234 */
1235 --*idx;
1236
1237 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1238 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
1239 LEFT.br_blockcount + PREV.br_blockcount +
1240 RIGHT.br_blockcount);
1241 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1242
1243 xfs_iext_remove(ip, *idx + 1, 2, state);
1244 ip->i_d.di_nextents -= 2;
1245 if (cur == NULL)
1246 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1247 else {
1248 rval = XFS_ILOG_CORE;
1249 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1250 RIGHT.br_startblock,
1251 RIGHT.br_blockcount, &i)))
1252 goto done;
1253 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1254 if ((error = xfs_btree_delete(cur, &i)))
1255 goto done;
1256 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1257 if ((error = xfs_btree_decrement(cur, 0, &i)))
1258 goto done;
1259 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1260 if ((error = xfs_btree_delete(cur, &i)))
1261 goto done;
1262 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1263 if ((error = xfs_btree_decrement(cur, 0, &i)))
1264 goto done;
1265 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1266 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1267 LEFT.br_startblock,
1268 LEFT.br_blockcount + PREV.br_blockcount +
1269 RIGHT.br_blockcount, LEFT.br_state)))
1270 goto done;
1271 }
1272 break;
1273
1274 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1275 /*
1276 * Setting all of a previous oldext extent to newext.
1277 * The left neighbor is contiguous, the right is not.
1278 */
1279 --*idx;
1280
1281 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1282 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
1283 LEFT.br_blockcount + PREV.br_blockcount);
1284 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1285
1286 xfs_iext_remove(ip, *idx + 1, 1, state);
1287 ip->i_d.di_nextents--;
1288 if (cur == NULL)
1289 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1290 else {
1291 rval = XFS_ILOG_CORE;
1292 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1293 PREV.br_startblock, PREV.br_blockcount,
1294 &i)))
1295 goto done;
1296 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1297 if ((error = xfs_btree_delete(cur, &i)))
1298 goto done;
1299 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1300 if ((error = xfs_btree_decrement(cur, 0, &i)))
1301 goto done;
1302 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1303 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1304 LEFT.br_startblock,
1305 LEFT.br_blockcount + PREV.br_blockcount,
1306 LEFT.br_state)))
1307 goto done;
1308 }
1309 break;
1310
1311 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1312 /*
1313 * Setting all of a previous oldext extent to newext.
1314 * The right neighbor is contiguous, the left is not.
1315 */
1316 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1317 xfs_bmbt_set_blockcount(ep,
1318 PREV.br_blockcount + RIGHT.br_blockcount);
1319 xfs_bmbt_set_state(ep, newext);
1320 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1321 xfs_iext_remove(ip, *idx + 1, 1, state);
1322 ip->i_d.di_nextents--;
1323 if (cur == NULL)
1324 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1325 else {
1326 rval = XFS_ILOG_CORE;
1327 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1328 RIGHT.br_startblock,
1329 RIGHT.br_blockcount, &i)))
1330 goto done;
1331 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1332 if ((error = xfs_btree_delete(cur, &i)))
1333 goto done;
1334 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1335 if ((error = xfs_btree_decrement(cur, 0, &i)))
1336 goto done;
1337 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1338 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1339 new->br_startblock,
1340 new->br_blockcount + RIGHT.br_blockcount,
1341 newext)))
1342 goto done;
1343 }
1344 break;
1345
1346 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
1347 /*
1348 * Setting all of a previous oldext extent to newext.
1349 * Neither the left nor right neighbors are contiguous with
1350 * the new one.
1351 */
1352 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1353 xfs_bmbt_set_state(ep, newext);
1354 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1355
1356 if (cur == NULL)
1357 rval = XFS_ILOG_DEXT;
1358 else {
1359 rval = 0;
1360 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1361 new->br_startblock, new->br_blockcount,
1362 &i)))
1363 goto done;
1364 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1365 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1366 new->br_startblock, new->br_blockcount,
1367 newext)))
1368 goto done;
1369 }
1370 break;
1371
1372 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
1373 /*
1374 * Setting the first part of a previous oldext extent to newext.
1375 * The left neighbor is contiguous.
1376 */
1377 trace_xfs_bmap_pre_update(ip, *idx - 1, state, _THIS_IP_);
1378 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx - 1),
1379 LEFT.br_blockcount + new->br_blockcount);
1380 xfs_bmbt_set_startoff(ep,
1381 PREV.br_startoff + new->br_blockcount);
1382 trace_xfs_bmap_post_update(ip, *idx - 1, state, _THIS_IP_);
1383
1384 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1385 xfs_bmbt_set_startblock(ep,
1386 new->br_startblock + new->br_blockcount);
1387 xfs_bmbt_set_blockcount(ep,
1388 PREV.br_blockcount - new->br_blockcount);
1389 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1390
1391 --*idx;
1392
1393 if (cur == NULL)
1394 rval = XFS_ILOG_DEXT;
1395 else {
1396 rval = 0;
1397 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1398 PREV.br_startblock, PREV.br_blockcount,
1399 &i)))
1400 goto done;
1401 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1402 if ((error = xfs_bmbt_update(cur,
1403 PREV.br_startoff + new->br_blockcount,
1404 PREV.br_startblock + new->br_blockcount,
1405 PREV.br_blockcount - new->br_blockcount,
1406 oldext)))
1407 goto done;
1408 if ((error = xfs_btree_decrement(cur, 0, &i)))
1409 goto done;
1410 if (xfs_bmbt_update(cur, LEFT.br_startoff,
1411 LEFT.br_startblock,
1412 LEFT.br_blockcount + new->br_blockcount,
1413 LEFT.br_state))
1414 goto done;
1415 }
1416 break;
1417
1418 case BMAP_LEFT_FILLING:
1419 /*
1420 * Setting the first part of a previous oldext extent to newext.
1421 * The left neighbor is not contiguous.
1422 */
1423 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1424 ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
1425 xfs_bmbt_set_startoff(ep, new_endoff);
1426 xfs_bmbt_set_blockcount(ep,
1427 PREV.br_blockcount - new->br_blockcount);
1428 xfs_bmbt_set_startblock(ep,
1429 new->br_startblock + new->br_blockcount);
1430 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1431
1432 xfs_iext_insert(ip, *idx, 1, new, state);
1433 ip->i_d.di_nextents++;
1434 if (cur == NULL)
1435 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1436 else {
1437 rval = XFS_ILOG_CORE;
1438 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1439 PREV.br_startblock, PREV.br_blockcount,
1440 &i)))
1441 goto done;
1442 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1443 if ((error = xfs_bmbt_update(cur,
1444 PREV.br_startoff + new->br_blockcount,
1445 PREV.br_startblock + new->br_blockcount,
1446 PREV.br_blockcount - new->br_blockcount,
1447 oldext)))
1448 goto done;
1449 cur->bc_rec.b = *new;
1450 if ((error = xfs_btree_insert(cur, &i)))
1451 goto done;
1452 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1453 }
1454 break;
1455
1456 case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1457 /*
1458 * Setting the last part of a previous oldext extent to newext.
1459 * The right neighbor is contiguous with the new allocation.
1460 */
1461 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1462 xfs_bmbt_set_blockcount(ep,
1463 PREV.br_blockcount - new->br_blockcount);
1464 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1465
1466 ++*idx;
1467
1468 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1469 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
1470 new->br_startoff, new->br_startblock,
1471 new->br_blockcount + RIGHT.br_blockcount, newext);
1472 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1473
1474 if (cur == NULL)
1475 rval = XFS_ILOG_DEXT;
1476 else {
1477 rval = 0;
1478 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1479 PREV.br_startblock,
1480 PREV.br_blockcount, &i)))
1481 goto done;
1482 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1483 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1484 PREV.br_startblock,
1485 PREV.br_blockcount - new->br_blockcount,
1486 oldext)))
1487 goto done;
1488 if ((error = xfs_btree_increment(cur, 0, &i)))
1489 goto done;
1490 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1491 new->br_startblock,
1492 new->br_blockcount + RIGHT.br_blockcount,
1493 newext)))
1494 goto done;
1495 }
1496 break;
1497
1498 case BMAP_RIGHT_FILLING:
1499 /*
1500 * Setting the last part of a previous oldext extent to newext.
1501 * The right neighbor is not contiguous.
1502 */
1503 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1504 xfs_bmbt_set_blockcount(ep,
1505 PREV.br_blockcount - new->br_blockcount);
1506 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1507
1508 ++*idx;
1509 xfs_iext_insert(ip, *idx, 1, new, state);
1510
1511 ip->i_d.di_nextents++;
1512 if (cur == NULL)
1513 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1514 else {
1515 rval = XFS_ILOG_CORE;
1516 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1517 PREV.br_startblock, PREV.br_blockcount,
1518 &i)))
1519 goto done;
1520 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1521 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1522 PREV.br_startblock,
1523 PREV.br_blockcount - new->br_blockcount,
1524 oldext)))
1525 goto done;
1526 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1527 new->br_startblock, new->br_blockcount,
1528 &i)))
1529 goto done;
1530 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1531 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1532 if ((error = xfs_btree_insert(cur, &i)))
1533 goto done;
1534 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1535 }
1536 break;
1537
1538 case 0:
1539 /*
1540 * Setting the middle part of a previous oldext extent to
1541 * newext. Contiguity is impossible here.
1542 * One extent becomes three extents.
1543 */
1544 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1545 xfs_bmbt_set_blockcount(ep,
1546 new->br_startoff - PREV.br_startoff);
1547 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1548
1549 r[0] = *new;
1550 r[1].br_startoff = new_endoff;
1551 r[1].br_blockcount =
1552 PREV.br_startoff + PREV.br_blockcount - new_endoff;
1553 r[1].br_startblock = new->br_startblock + new->br_blockcount;
1554 r[1].br_state = oldext;
1555
1556 ++*idx;
1557 xfs_iext_insert(ip, *idx, 2, &r[0], state);
1558
1559 ip->i_d.di_nextents += 2;
1560 if (cur == NULL)
1561 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1562 else {
1563 rval = XFS_ILOG_CORE;
1564 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1565 PREV.br_startblock, PREV.br_blockcount,
1566 &i)))
1567 goto done;
1568 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1569 /* new right extent - oldext */
1570 if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
1571 r[1].br_startblock, r[1].br_blockcount,
1572 r[1].br_state)))
1573 goto done;
1574 /* new left extent - oldext */
1575 cur->bc_rec.b = PREV;
1576 cur->bc_rec.b.br_blockcount =
1577 new->br_startoff - PREV.br_startoff;
1578 if ((error = xfs_btree_insert(cur, &i)))
1579 goto done;
1580 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1581 /*
1582 * Reset the cursor to the position of the new extent
1583 * we are about to insert as we can't trust it after
1584 * the previous insert.
1585 */
1586 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1587 new->br_startblock, new->br_blockcount,
1588 &i)))
1589 goto done;
1590 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1591 /* new middle extent - newext */
1592 cur->bc_rec.b.br_state = new->br_state;
1593 if ((error = xfs_btree_insert(cur, &i)))
1594 goto done;
1595 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1596 }
1597 break;
1598
1599 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1600 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1601 case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
1602 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1603 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1604 case BMAP_LEFT_CONTIG:
1605 case BMAP_RIGHT_CONTIG:
1606 /*
1607 * These cases are all impossible.
1608 */
1609 ASSERT(0);
1610 }
1611 *curp = cur;
1612 done:
1613 *logflagsp = rval;
1614 return error;
1615 #undef LEFT
1616 #undef RIGHT
1617 #undef PREV
1618 }
1619
1620 /*
1621 * Called by xfs_bmap_add_extent to handle cases converting a hole
1622 * to a delayed allocation.
1623 */
1624 /*ARGSUSED*/
1625 STATIC int /* error */
1626 xfs_bmap_add_extent_hole_delay(
1627 xfs_inode_t *ip, /* incore inode pointer */
1628 xfs_extnum_t *idx, /* extent number to update/insert */
1629 xfs_bmbt_irec_t *new, /* new data to add to file extents */
1630 int *logflagsp) /* inode logging flags */
1631 {
1632 xfs_ifork_t *ifp; /* inode fork pointer */
1633 xfs_bmbt_irec_t left; /* left neighbor extent entry */
1634 xfs_filblks_t newlen=0; /* new indirect size */
1635 xfs_filblks_t oldlen=0; /* old indirect size */
1636 xfs_bmbt_irec_t right; /* right neighbor extent entry */
1637 int state; /* state bits, accessed thru macros */
1638 xfs_filblks_t temp=0; /* temp for indirect calculations */
1639
1640 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1641 state = 0;
1642 ASSERT(isnullstartblock(new->br_startblock));
1643
1644 /*
1645 * Check and set flags if this segment has a left neighbor
1646 */
1647 if (*idx > 0) {
1648 state |= BMAP_LEFT_VALID;
1649 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &left);
1650
1651 if (isnullstartblock(left.br_startblock))
1652 state |= BMAP_LEFT_DELAY;
1653 }
1654
1655 /*
1656 * Check and set flags if the current (right) segment exists.
1657 * If it doesn't exist, we're converting the hole at end-of-file.
1658 */
1659 if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
1660 state |= BMAP_RIGHT_VALID;
1661 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right);
1662
1663 if (isnullstartblock(right.br_startblock))
1664 state |= BMAP_RIGHT_DELAY;
1665 }
1666
1667 /*
1668 * Set contiguity flags on the left and right neighbors.
1669 * Don't let extents get too large, even if the pieces are contiguous.
1670 */
1671 if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) &&
1672 left.br_startoff + left.br_blockcount == new->br_startoff &&
1673 left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1674 state |= BMAP_LEFT_CONTIG;
1675
1676 if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) &&
1677 new->br_startoff + new->br_blockcount == right.br_startoff &&
1678 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
1679 (!(state & BMAP_LEFT_CONTIG) ||
1680 (left.br_blockcount + new->br_blockcount +
1681 right.br_blockcount <= MAXEXTLEN)))
1682 state |= BMAP_RIGHT_CONTIG;
1683
1684 /*
1685 * Switch out based on the contiguity flags.
1686 */
1687 switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
1688 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1689 /*
1690 * New allocation is contiguous with delayed allocations
1691 * on the left and on the right.
1692 * Merge all three into a single extent record.
1693 */
1694 --*idx;
1695 temp = left.br_blockcount + new->br_blockcount +
1696 right.br_blockcount;
1697
1698 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1699 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
1700 oldlen = startblockval(left.br_startblock) +
1701 startblockval(new->br_startblock) +
1702 startblockval(right.br_startblock);
1703 newlen = xfs_bmap_worst_indlen(ip, temp);
1704 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
1705 nullstartblock((int)newlen));
1706 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1707
1708 xfs_iext_remove(ip, *idx + 1, 1, state);
1709 break;
1710
1711 case BMAP_LEFT_CONTIG:
1712 /*
1713 * New allocation is contiguous with a delayed allocation
1714 * on the left.
1715 * Merge the new allocation with the left neighbor.
1716 */
1717 --*idx;
1718 temp = left.br_blockcount + new->br_blockcount;
1719
1720 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1721 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
1722 oldlen = startblockval(left.br_startblock) +
1723 startblockval(new->br_startblock);
1724 newlen = xfs_bmap_worst_indlen(ip, temp);
1725 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
1726 nullstartblock((int)newlen));
1727 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1728 break;
1729
1730 case BMAP_RIGHT_CONTIG:
1731 /*
1732 * New allocation is contiguous with a delayed allocation
1733 * on the right.
1734 * Merge the new allocation with the right neighbor.
1735 */
1736 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1737 temp = new->br_blockcount + right.br_blockcount;
1738 oldlen = startblockval(new->br_startblock) +
1739 startblockval(right.br_startblock);
1740 newlen = xfs_bmap_worst_indlen(ip, temp);
1741 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
1742 new->br_startoff,
1743 nullstartblock((int)newlen), temp, right.br_state);
1744 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1745 break;
1746
1747 case 0:
1748 /*
1749 * New allocation is not contiguous with another
1750 * delayed allocation.
1751 * Insert a new entry.
1752 */
1753 oldlen = newlen = 0;
1754 xfs_iext_insert(ip, *idx, 1, new, state);
1755 break;
1756 }
1757 if (oldlen != newlen) {
1758 ASSERT(oldlen > newlen);
1759 xfs_icsb_modify_counters(ip->i_mount, XFS_SBS_FDBLOCKS,
1760 (int64_t)(oldlen - newlen), 0);
1761 /*
1762 * Nothing to do for disk quota accounting here.
1763 */
1764 }
1765 *logflagsp = 0;
1766 return 0;
1767 }
1768
1769 /*
1770 * Called by xfs_bmap_add_extent to handle cases converting a hole
1771 * to a real allocation.
1772 */
1773 STATIC int /* error */
1774 xfs_bmap_add_extent_hole_real(
1775 xfs_inode_t *ip, /* incore inode pointer */
1776 xfs_extnum_t *idx, /* extent number to update/insert */
1777 xfs_btree_cur_t *cur, /* if null, not a btree */
1778 xfs_bmbt_irec_t *new, /* new data to add to file extents */
1779 int *logflagsp, /* inode logging flags */
1780 int whichfork) /* data or attr fork */
1781 {
1782 int error; /* error return value */
1783 int i; /* temp state */
1784 xfs_ifork_t *ifp; /* inode fork pointer */
1785 xfs_bmbt_irec_t left; /* left neighbor extent entry */
1786 xfs_bmbt_irec_t right; /* right neighbor extent entry */
1787 int rval=0; /* return value (logging flags) */
1788 int state; /* state bits, accessed thru macros */
1789
1790 ifp = XFS_IFORK_PTR(ip, whichfork);
1791 ASSERT(*idx <= ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
1792 state = 0;
1793
1794 if (whichfork == XFS_ATTR_FORK)
1795 state |= BMAP_ATTRFORK;
1796
1797 /*
1798 * Check and set flags if this segment has a left neighbor.
1799 */
1800 if (*idx > 0) {
1801 state |= BMAP_LEFT_VALID;
1802 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &left);
1803 if (isnullstartblock(left.br_startblock))
1804 state |= BMAP_LEFT_DELAY;
1805 }
1806
1807 /*
1808 * Check and set flags if this segment has a current value.
1809 * Not true if we're inserting into the "hole" at eof.
1810 */
1811 if (*idx < ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
1812 state |= BMAP_RIGHT_VALID;
1813 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right);
1814 if (isnullstartblock(right.br_startblock))
1815 state |= BMAP_RIGHT_DELAY;
1816 }
1817
1818 /*
1819 * We're inserting a real allocation between "left" and "right".
1820 * Set the contiguity flags. Don't let extents get too large.
1821 */
1822 if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
1823 left.br_startoff + left.br_blockcount == new->br_startoff &&
1824 left.br_startblock + left.br_blockcount == new->br_startblock &&
1825 left.br_state == new->br_state &&
1826 left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1827 state |= BMAP_LEFT_CONTIG;
1828
1829 if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
1830 new->br_startoff + new->br_blockcount == right.br_startoff &&
1831 new->br_startblock + new->br_blockcount == right.br_startblock &&
1832 new->br_state == right.br_state &&
1833 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
1834 (!(state & BMAP_LEFT_CONTIG) ||
1835 left.br_blockcount + new->br_blockcount +
1836 right.br_blockcount <= MAXEXTLEN))
1837 state |= BMAP_RIGHT_CONTIG;
1838
1839 error = 0;
1840 /*
1841 * Select which case we're in here, and implement it.
1842 */
1843 switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
1844 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1845 /*
1846 * New allocation is contiguous with real allocations on the
1847 * left and on the right.
1848 * Merge all three into a single extent record.
1849 */
1850 --*idx;
1851 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1852 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
1853 left.br_blockcount + new->br_blockcount +
1854 right.br_blockcount);
1855 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1856
1857 xfs_iext_remove(ip, *idx + 1, 1, state);
1858
1859 XFS_IFORK_NEXT_SET(ip, whichfork,
1860 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
1861 if (cur == NULL) {
1862 rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
1863 } else {
1864 rval = XFS_ILOG_CORE;
1865 if ((error = xfs_bmbt_lookup_eq(cur,
1866 right.br_startoff,
1867 right.br_startblock,
1868 right.br_blockcount, &i)))
1869 goto done;
1870 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1871 if ((error = xfs_btree_delete(cur, &i)))
1872 goto done;
1873 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1874 if ((error = xfs_btree_decrement(cur, 0, &i)))
1875 goto done;
1876 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1877 if ((error = xfs_bmbt_update(cur, left.br_startoff,
1878 left.br_startblock,
1879 left.br_blockcount +
1880 new->br_blockcount +
1881 right.br_blockcount,
1882 left.br_state)))
1883 goto done;
1884 }
1885 break;
1886
1887 case BMAP_LEFT_CONTIG:
1888 /*
1889 * New allocation is contiguous with a real allocation
1890 * on the left.
1891 * Merge the new allocation with the left neighbor.
1892 */
1893 --*idx;
1894 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1895 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
1896 left.br_blockcount + new->br_blockcount);
1897 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1898
1899 if (cur == NULL) {
1900 rval = xfs_ilog_fext(whichfork);
1901 } else {
1902 rval = 0;
1903 if ((error = xfs_bmbt_lookup_eq(cur,
1904 left.br_startoff,
1905 left.br_startblock,
1906 left.br_blockcount, &i)))
1907 goto done;
1908 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1909 if ((error = xfs_bmbt_update(cur, left.br_startoff,
1910 left.br_startblock,
1911 left.br_blockcount +
1912 new->br_blockcount,
1913 left.br_state)))
1914 goto done;
1915 }
1916 break;
1917
1918 case BMAP_RIGHT_CONTIG:
1919 /*
1920 * New allocation is contiguous with a real allocation
1921 * on the right.
1922 * Merge the new allocation with the right neighbor.
1923 */
1924 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1925 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
1926 new->br_startoff, new->br_startblock,
1927 new->br_blockcount + right.br_blockcount,
1928 right.br_state);
1929 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1930
1931 if (cur == NULL) {
1932 rval = xfs_ilog_fext(whichfork);
1933 } else {
1934 rval = 0;
1935 if ((error = xfs_bmbt_lookup_eq(cur,
1936 right.br_startoff,
1937 right.br_startblock,
1938 right.br_blockcount, &i)))
1939 goto done;
1940 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1941 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1942 new->br_startblock,
1943 new->br_blockcount +
1944 right.br_blockcount,
1945 right.br_state)))
1946 goto done;
1947 }
1948 break;
1949
1950 case 0:
1951 /*
1952 * New allocation is not contiguous with another
1953 * real allocation.
1954 * Insert a new entry.
1955 */
1956 xfs_iext_insert(ip, *idx, 1, new, state);
1957 XFS_IFORK_NEXT_SET(ip, whichfork,
1958 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
1959 if (cur == NULL) {
1960 rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
1961 } else {
1962 rval = XFS_ILOG_CORE;
1963 if ((error = xfs_bmbt_lookup_eq(cur,
1964 new->br_startoff,
1965 new->br_startblock,
1966 new->br_blockcount, &i)))
1967 goto done;
1968 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1969 cur->bc_rec.b.br_state = new->br_state;
1970 if ((error = xfs_btree_insert(cur, &i)))
1971 goto done;
1972 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1973 }
1974 break;
1975 }
1976 done:
1977 *logflagsp = rval;
1978 return error;
1979 }
1980
1981 /*
1982 * Adjust the size of the new extent based on di_extsize and rt extsize.
1983 */
1984 STATIC int
1985 xfs_bmap_extsize_align(
1986 xfs_mount_t *mp,
1987 xfs_bmbt_irec_t *gotp, /* next extent pointer */
1988 xfs_bmbt_irec_t *prevp, /* previous extent pointer */
1989 xfs_extlen_t extsz, /* align to this extent size */
1990 int rt, /* is this a realtime inode? */
1991 int eof, /* is extent at end-of-file? */
1992 int delay, /* creating delalloc extent? */
1993 int convert, /* overwriting unwritten extent? */
1994 xfs_fileoff_t *offp, /* in/out: aligned offset */
1995 xfs_extlen_t *lenp) /* in/out: aligned length */
1996 {
1997 xfs_fileoff_t orig_off; /* original offset */
1998 xfs_extlen_t orig_alen; /* original length */
1999 xfs_fileoff_t orig_end; /* original off+len */
2000 xfs_fileoff_t nexto; /* next file offset */
2001 xfs_fileoff_t prevo; /* previous file offset */
2002 xfs_fileoff_t align_off; /* temp for offset */
2003 xfs_extlen_t align_alen; /* temp for length */
2004 xfs_extlen_t temp; /* temp for calculations */
2005
2006 if (convert)
2007 return 0;
2008
2009 orig_off = align_off = *offp;
2010 orig_alen = align_alen = *lenp;
2011 orig_end = orig_off + orig_alen;
2012
2013 /*
2014 * If this request overlaps an existing extent, then don't
2015 * attempt to perform any additional alignment.
2016 */
2017 if (!delay && !eof &&
2018 (orig_off >= gotp->br_startoff) &&
2019 (orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
2020 return 0;
2021 }
2022
2023 /*
2024 * If the file offset is unaligned vs. the extent size
2025 * we need to align it. This will be possible unless
2026 * the file was previously written with a kernel that didn't
2027 * perform this alignment, or if a truncate shot us in the
2028 * foot.
2029 */
2030 temp = do_mod(orig_off, extsz);
2031 if (temp) {
2032 align_alen += temp;
2033 align_off -= temp;
2034 }
2035 /*
2036 * Same adjustment for the end of the requested area.
2037 */
2038 if ((temp = (align_alen % extsz))) {
2039 align_alen += extsz - temp;
2040 }
2041 /*
2042 * If the previous block overlaps with this proposed allocation
2043 * then move the start forward without adjusting the length.
2044 */
2045 if (prevp->br_startoff != NULLFILEOFF) {
2046 if (prevp->br_startblock == HOLESTARTBLOCK)
2047 prevo = prevp->br_startoff;
2048 else
2049 prevo = prevp->br_startoff + prevp->br_blockcount;
2050 } else
2051 prevo = 0;
2052 if (align_off != orig_off && align_off < prevo)
2053 align_off = prevo;
2054 /*
2055 * If the next block overlaps with this proposed allocation
2056 * then move the start back without adjusting the length,
2057 * but not before offset 0.
2058 * This may of course make the start overlap previous block,
2059 * and if we hit the offset 0 limit then the next block
2060 * can still overlap too.
2061 */
2062 if (!eof && gotp->br_startoff != NULLFILEOFF) {
2063 if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
2064 (!delay && gotp->br_startblock == DELAYSTARTBLOCK))
2065 nexto = gotp->br_startoff + gotp->br_blockcount;
2066 else
2067 nexto = gotp->br_startoff;
2068 } else
2069 nexto = NULLFILEOFF;
2070 if (!eof &&
2071 align_off + align_alen != orig_end &&
2072 align_off + align_alen > nexto)
2073 align_off = nexto > align_alen ? nexto - align_alen : 0;
2074 /*
2075 * If we're now overlapping the next or previous extent that
2076 * means we can't fit an extsz piece in this hole. Just move
2077 * the start forward to the first valid spot and set
2078 * the length so we hit the end.
2079 */
2080 if (align_off != orig_off && align_off < prevo)
2081 align_off = prevo;
2082 if (align_off + align_alen != orig_end &&
2083 align_off + align_alen > nexto &&
2084 nexto != NULLFILEOFF) {
2085 ASSERT(nexto > prevo);
2086 align_alen = nexto - align_off;
2087 }
2088
2089 /*
2090 * If realtime, and the result isn't a multiple of the realtime
2091 * extent size we need to remove blocks until it is.
2092 */
2093 if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
2094 /*
2095 * We're not covering the original request, or
2096 * we won't be able to once we fix the length.
2097 */
2098 if (orig_off < align_off ||
2099 orig_end > align_off + align_alen ||
2100 align_alen - temp < orig_alen)
2101 return XFS_ERROR(EINVAL);
2102 /*
2103 * Try to fix it by moving the start up.
2104 */
2105 if (align_off + temp <= orig_off) {
2106 align_alen -= temp;
2107 align_off += temp;
2108 }
2109 /*
2110 * Try to fix it by moving the end in.
2111 */
2112 else if (align_off + align_alen - temp >= orig_end)
2113 align_alen -= temp;
2114 /*
2115 * Set the start to the minimum then trim the length.
2116 */
2117 else {
2118 align_alen -= orig_off - align_off;
2119 align_off = orig_off;
2120 align_alen -= align_alen % mp->m_sb.sb_rextsize;
2121 }
2122 /*
2123 * Result doesn't cover the request, fail it.
2124 */
2125 if (orig_off < align_off || orig_end > align_off + align_alen)
2126 return XFS_ERROR(EINVAL);
2127 } else {
2128 ASSERT(orig_off >= align_off);
2129 ASSERT(orig_end <= align_off + align_alen);
2130 }
2131
2132 #ifdef DEBUG
2133 if (!eof && gotp->br_startoff != NULLFILEOFF)
2134 ASSERT(align_off + align_alen <= gotp->br_startoff);
2135 if (prevp->br_startoff != NULLFILEOFF)
2136 ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
2137 #endif
2138
2139 *lenp = align_alen;
2140 *offp = align_off;
2141 return 0;
2142 }
2143
2144 #define XFS_ALLOC_GAP_UNITS 4
2145
2146 STATIC void
2147 xfs_bmap_adjacent(
2148 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2149 {
2150 xfs_fsblock_t adjust; /* adjustment to block numbers */
2151 xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
2152 xfs_mount_t *mp; /* mount point structure */
2153 int nullfb; /* true if ap->firstblock isn't set */
2154 int rt; /* true if inode is realtime */
2155
2156 #define ISVALID(x,y) \
2157 (rt ? \
2158 (x) < mp->m_sb.sb_rblocks : \
2159 XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
2160 XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
2161 XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
2162
2163 mp = ap->ip->i_mount;
2164 nullfb = ap->firstblock == NULLFSBLOCK;
2165 rt = XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata;
2166 fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
2167 /*
2168 * If allocating at eof, and there's a previous real block,
2169 * try to use its last block as our starting point.
2170 */
2171 if (ap->eof && ap->prevp->br_startoff != NULLFILEOFF &&
2172 !isnullstartblock(ap->prevp->br_startblock) &&
2173 ISVALID(ap->prevp->br_startblock + ap->prevp->br_blockcount,
2174 ap->prevp->br_startblock)) {
2175 ap->rval = ap->prevp->br_startblock + ap->prevp->br_blockcount;
2176 /*
2177 * Adjust for the gap between prevp and us.
2178 */
2179 adjust = ap->off -
2180 (ap->prevp->br_startoff + ap->prevp->br_blockcount);
2181 if (adjust &&
2182 ISVALID(ap->rval + adjust, ap->prevp->br_startblock))
2183 ap->rval += adjust;
2184 }
2185 /*
2186 * If not at eof, then compare the two neighbor blocks.
2187 * Figure out whether either one gives us a good starting point,
2188 * and pick the better one.
2189 */
2190 else if (!ap->eof) {
2191 xfs_fsblock_t gotbno; /* right side block number */
2192 xfs_fsblock_t gotdiff=0; /* right side difference */
2193 xfs_fsblock_t prevbno; /* left side block number */
2194 xfs_fsblock_t prevdiff=0; /* left side difference */
2195
2196 /*
2197 * If there's a previous (left) block, select a requested
2198 * start block based on it.
2199 */
2200 if (ap->prevp->br_startoff != NULLFILEOFF &&
2201 !isnullstartblock(ap->prevp->br_startblock) &&
2202 (prevbno = ap->prevp->br_startblock +
2203 ap->prevp->br_blockcount) &&
2204 ISVALID(prevbno, ap->prevp->br_startblock)) {
2205 /*
2206 * Calculate gap to end of previous block.
2207 */
2208 adjust = prevdiff = ap->off -
2209 (ap->prevp->br_startoff +
2210 ap->prevp->br_blockcount);
2211 /*
2212 * Figure the startblock based on the previous block's
2213 * end and the gap size.
2214 * Heuristic!
2215 * If the gap is large relative to the piece we're
2216 * allocating, or using it gives us an invalid block
2217 * number, then just use the end of the previous block.
2218 */
2219 if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
2220 ISVALID(prevbno + prevdiff,
2221 ap->prevp->br_startblock))
2222 prevbno += adjust;
2223 else
2224 prevdiff += adjust;
2225 /*
2226 * If the firstblock forbids it, can't use it,
2227 * must use default.
2228 */
2229 if (!rt && !nullfb &&
2230 XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
2231 prevbno = NULLFSBLOCK;
2232 }
2233 /*
2234 * No previous block or can't follow it, just default.
2235 */
2236 else
2237 prevbno = NULLFSBLOCK;
2238 /*
2239 * If there's a following (right) block, select a requested
2240 * start block based on it.
2241 */
2242 if (!isnullstartblock(ap->gotp->br_startblock)) {
2243 /*
2244 * Calculate gap to start of next block.
2245 */
2246 adjust = gotdiff = ap->gotp->br_startoff - ap->off;
2247 /*
2248 * Figure the startblock based on the next block's
2249 * start and the gap size.
2250 */
2251 gotbno = ap->gotp->br_startblock;
2252 /*
2253 * Heuristic!
2254 * If the gap is large relative to the piece we're
2255 * allocating, or using it gives us an invalid block
2256 * number, then just use the start of the next block
2257 * offset by our length.
2258 */
2259 if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
2260 ISVALID(gotbno - gotdiff, gotbno))
2261 gotbno -= adjust;
2262 else if (ISVALID(gotbno - ap->alen, gotbno)) {
2263 gotbno -= ap->alen;
2264 gotdiff += adjust - ap->alen;
2265 } else
2266 gotdiff += adjust;
2267 /*
2268 * If the firstblock forbids it, can't use it,
2269 * must use default.
2270 */
2271 if (!rt && !nullfb &&
2272 XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
2273 gotbno = NULLFSBLOCK;
2274 }
2275 /*
2276 * No next block, just default.
2277 */
2278 else
2279 gotbno = NULLFSBLOCK;
2280 /*
2281 * If both valid, pick the better one, else the only good
2282 * one, else ap->rval is already set (to 0 or the inode block).
2283 */
2284 if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
2285 ap->rval = prevdiff <= gotdiff ? prevbno : gotbno;
2286 else if (prevbno != NULLFSBLOCK)
2287 ap->rval = prevbno;
2288 else if (gotbno != NULLFSBLOCK)
2289 ap->rval = gotbno;
2290 }
2291 #undef ISVALID
2292 }
2293
2294 STATIC int
2295 xfs_bmap_rtalloc(
2296 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2297 {
2298 xfs_alloctype_t atype = 0; /* type for allocation routines */
2299 int error; /* error return value */
2300 xfs_mount_t *mp; /* mount point structure */
2301 xfs_extlen_t prod = 0; /* product factor for allocators */
2302 xfs_extlen_t ralen = 0; /* realtime allocation length */
2303 xfs_extlen_t align; /* minimum allocation alignment */
2304 xfs_rtblock_t rtb;
2305
2306 mp = ap->ip->i_mount;
2307 align = xfs_get_extsz_hint(ap->ip);
2308 prod = align / mp->m_sb.sb_rextsize;
2309 error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
2310 align, 1, ap->eof, 0,
2311 ap->conv, &ap->off, &ap->alen);
2312 if (error)
2313 return error;
2314 ASSERT(ap->alen);
2315 ASSERT(ap->alen % mp->m_sb.sb_rextsize == 0);
2316
2317 /*
2318 * If the offset & length are not perfectly aligned
2319 * then kill prod, it will just get us in trouble.
2320 */
2321 if (do_mod(ap->off, align) || ap->alen % align)
2322 prod = 1;
2323 /*
2324 * Set ralen to be the actual requested length in rtextents.
2325 */
2326 ralen = ap->alen / mp->m_sb.sb_rextsize;
2327 /*
2328 * If the old value was close enough to MAXEXTLEN that
2329 * we rounded up to it, cut it back so it's valid again.
2330 * Note that if it's a really large request (bigger than
2331 * MAXEXTLEN), we don't hear about that number, and can't
2332 * adjust the starting point to match it.
2333 */
2334 if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
2335 ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
2336
2337 /*
2338 * Lock out other modifications to the RT bitmap inode.
2339 */
2340 xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
2341 xfs_trans_ijoin_ref(ap->tp, mp->m_rbmip, XFS_ILOCK_EXCL);
2342
2343 /*
2344 * If it's an allocation to an empty file at offset 0,
2345 * pick an extent that will space things out in the rt area.
2346 */
2347 if (ap->eof && ap->off == 0) {
2348 xfs_rtblock_t uninitialized_var(rtx); /* realtime extent no */
2349
2350 error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
2351 if (error)
2352 return error;
2353 ap->rval = rtx * mp->m_sb.sb_rextsize;
2354 } else {
2355 ap->rval = 0;
2356 }
2357
2358 xfs_bmap_adjacent(ap);
2359
2360 /*
2361 * Realtime allocation, done through xfs_rtallocate_extent.
2362 */
2363 atype = ap->rval == 0 ? XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
2364 do_div(ap->rval, mp->m_sb.sb_rextsize);
2365 rtb = ap->rval;
2366 ap->alen = ralen;
2367 if ((error = xfs_rtallocate_extent(ap->tp, ap->rval, 1, ap->alen,
2368 &ralen, atype, ap->wasdel, prod, &rtb)))
2369 return error;
2370 if (rtb == NULLFSBLOCK && prod > 1 &&
2371 (error = xfs_rtallocate_extent(ap->tp, ap->rval, 1,
2372 ap->alen, &ralen, atype,
2373 ap->wasdel, 1, &rtb)))
2374 return error;
2375 ap->rval = rtb;
2376 if (ap->rval != NULLFSBLOCK) {
2377 ap->rval *= mp->m_sb.sb_rextsize;
2378 ralen *= mp->m_sb.sb_rextsize;
2379 ap->alen = ralen;
2380 ap->ip->i_d.di_nblocks += ralen;
2381 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2382 if (ap->wasdel)
2383 ap->ip->i_delayed_blks -= ralen;
2384 /*
2385 * Adjust the disk quota also. This was reserved
2386 * earlier.
2387 */
2388 xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
2389 ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
2390 XFS_TRANS_DQ_RTBCOUNT, (long) ralen);
2391 } else {
2392 ap->alen = 0;
2393 }
2394 return 0;
2395 }
2396
2397 STATIC int
2398 xfs_bmap_btalloc_nullfb(
2399 struct xfs_bmalloca *ap,
2400 struct xfs_alloc_arg *args,
2401 xfs_extlen_t *blen)
2402 {
2403 struct xfs_mount *mp = ap->ip->i_mount;
2404 struct xfs_perag *pag;
2405 xfs_agnumber_t ag, startag;
2406 int notinit = 0;
2407 int error;
2408
2409 if (ap->userdata && xfs_inode_is_filestream(ap->ip))
2410 args->type = XFS_ALLOCTYPE_NEAR_BNO;
2411 else
2412 args->type = XFS_ALLOCTYPE_START_BNO;
2413 args->total = ap->total;
2414
2415 /*
2416 * Search for an allocation group with a single extent large enough
2417 * for the request. If one isn't found, then adjust the minimum
2418 * allocation size to the largest space found.
2419 */
2420 startag = ag = XFS_FSB_TO_AGNO(mp, args->fsbno);
2421 if (startag == NULLAGNUMBER)
2422 startag = ag = 0;
2423
2424 pag = xfs_perag_get(mp, ag);
2425 while (*blen < args->maxlen) {
2426 if (!pag->pagf_init) {
2427 error = xfs_alloc_pagf_init(mp, args->tp, ag,
2428 XFS_ALLOC_FLAG_TRYLOCK);
2429 if (error) {
2430 xfs_perag_put(pag);
2431 return error;
2432 }
2433 }
2434
2435 /*
2436 * See xfs_alloc_fix_freelist...
2437 */
2438 if (pag->pagf_init) {
2439 xfs_extlen_t longest;
2440 longest = xfs_alloc_longest_free_extent(mp, pag);
2441 if (*blen < longest)
2442 *blen = longest;
2443 } else
2444 notinit = 1;
2445
2446 if (xfs_inode_is_filestream(ap->ip)) {
2447 if (*blen >= args->maxlen)
2448 break;
2449
2450 if (ap->userdata) {
2451 /*
2452 * If startag is an invalid AG, we've
2453 * come here once before and
2454 * xfs_filestream_new_ag picked the
2455 * best currently available.
2456 *
2457 * Don't continue looping, since we
2458 * could loop forever.
2459 */
2460 if (startag == NULLAGNUMBER)
2461 break;
2462
2463 error = xfs_filestream_new_ag(ap, &ag);
2464 xfs_perag_put(pag);
2465 if (error)
2466 return error;
2467
2468 /* loop again to set 'blen'*/
2469 startag = NULLAGNUMBER;
2470 pag = xfs_perag_get(mp, ag);
2471 continue;
2472 }
2473 }
2474 if (++ag == mp->m_sb.sb_agcount)
2475 ag = 0;
2476 if (ag == startag)
2477 break;
2478 xfs_perag_put(pag);
2479 pag = xfs_perag_get(mp, ag);
2480 }
2481 xfs_perag_put(pag);
2482
2483 /*
2484 * Since the above loop did a BUF_TRYLOCK, it is
2485 * possible that there is space for this request.
2486 */
2487 if (notinit || *blen < ap->minlen)
2488 args->minlen = ap->minlen;
2489 /*
2490 * If the best seen length is less than the request
2491 * length, use the best as the minimum.
2492 */
2493 else if (*blen < args->maxlen)
2494 args->minlen = *blen;
2495 /*
2496 * Otherwise we've seen an extent as big as maxlen,
2497 * use that as the minimum.
2498 */
2499 else
2500 args->minlen = args->maxlen;
2501
2502 /*
2503 * set the failure fallback case to look in the selected
2504 * AG as the stream may have moved.
2505 */
2506 if (xfs_inode_is_filestream(ap->ip))
2507 ap->rval = args->fsbno = XFS_AGB_TO_FSB(mp, ag, 0);
2508
2509 return 0;
2510 }
2511
2512 STATIC int
2513 xfs_bmap_btalloc(
2514 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2515 {
2516 xfs_mount_t *mp; /* mount point structure */
2517 xfs_alloctype_t atype = 0; /* type for allocation routines */
2518 xfs_extlen_t align; /* minimum allocation alignment */
2519 xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
2520 xfs_agnumber_t ag;
2521 xfs_alloc_arg_t args;
2522 xfs_extlen_t blen;
2523 xfs_extlen_t nextminlen = 0;
2524 int nullfb; /* true if ap->firstblock isn't set */
2525 int isaligned;
2526 int tryagain;
2527 int error;
2528
2529 mp = ap->ip->i_mount;
2530 align = ap->userdata ? xfs_get_extsz_hint(ap->ip) : 0;
2531 if (unlikely(align)) {
2532 error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
2533 align, 0, ap->eof, 0, ap->conv,
2534 &ap->off, &ap->alen);
2535 ASSERT(!error);
2536 ASSERT(ap->alen);
2537 }
2538 nullfb = ap->firstblock == NULLFSBLOCK;
2539 fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
2540 if (nullfb) {
2541 if (ap->userdata && xfs_inode_is_filestream(ap->ip)) {
2542 ag = xfs_filestream_lookup_ag(ap->ip);
2543 ag = (ag != NULLAGNUMBER) ? ag : 0;
2544 ap->rval = XFS_AGB_TO_FSB(mp, ag, 0);
2545 } else {
2546 ap->rval = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
2547 }
2548 } else
2549 ap->rval = ap->firstblock;
2550
2551 xfs_bmap_adjacent(ap);
2552
2553 /*
2554 * If allowed, use ap->rval; otherwise must use firstblock since
2555 * it's in the right allocation group.
2556 */
2557 if (nullfb || XFS_FSB_TO_AGNO(mp, ap->rval) == fb_agno)
2558 ;
2559 else
2560 ap->rval = ap->firstblock;
2561 /*
2562 * Normal allocation, done through xfs_alloc_vextent.
2563 */
2564 tryagain = isaligned = 0;
2565 args.tp = ap->tp;
2566 args.mp = mp;
2567 args.fsbno = ap->rval;
2568
2569 /* Trim the allocation back to the maximum an AG can fit. */
2570 args.maxlen = MIN(ap->alen, XFS_ALLOC_AG_MAX_USABLE(mp));
2571 args.firstblock = ap->firstblock;
2572 blen = 0;
2573 if (nullfb) {
2574 error = xfs_bmap_btalloc_nullfb(ap, &args, &blen);
2575 if (error)
2576 return error;
2577 } else if (ap->low) {
2578 if (xfs_inode_is_filestream(ap->ip))
2579 args.type = XFS_ALLOCTYPE_FIRST_AG;
2580 else
2581 args.type = XFS_ALLOCTYPE_START_BNO;
2582 args.total = args.minlen = ap->minlen;
2583 } else {
2584 args.type = XFS_ALLOCTYPE_NEAR_BNO;
2585 args.total = ap->total;
2586 args.minlen = ap->minlen;
2587 }
2588 /* apply extent size hints if obtained earlier */
2589 if (unlikely(align)) {
2590 args.prod = align;
2591 if ((args.mod = (xfs_extlen_t)do_mod(ap->off, args.prod)))
2592 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2593 } else if (mp->m_sb.sb_blocksize >= PAGE_CACHE_SIZE) {
2594 args.prod = 1;
2595 args.mod = 0;
2596 } else {
2597 args.prod = PAGE_CACHE_SIZE >> mp->m_sb.sb_blocklog;
2598 if ((args.mod = (xfs_extlen_t)(do_mod(ap->off, args.prod))))
2599 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2600 }
2601 /*
2602 * If we are not low on available data blocks, and the
2603 * underlying logical volume manager is a stripe, and
2604 * the file offset is zero then try to allocate data
2605 * blocks on stripe unit boundary.
2606 * NOTE: ap->aeof is only set if the allocation length
2607 * is >= the stripe unit and the allocation offset is
2608 * at the end of file.
2609 */
2610 if (!ap->low && ap->aeof) {
2611 if (!ap->off) {
2612 args.alignment = mp->m_dalign;
2613 atype = args.type;
2614 isaligned = 1;
2615 /*
2616 * Adjust for alignment
2617 */
2618 if (blen > args.alignment && blen <= args.maxlen)
2619 args.minlen = blen - args.alignment;
2620 args.minalignslop = 0;
2621 } else {
2622 /*
2623 * First try an exact bno allocation.
2624 * If it fails then do a near or start bno
2625 * allocation with alignment turned on.
2626 */
2627 atype = args.type;
2628 tryagain = 1;
2629 args.type = XFS_ALLOCTYPE_THIS_BNO;
2630 args.alignment = 1;
2631 /*
2632 * Compute the minlen+alignment for the
2633 * next case. Set slop so that the value
2634 * of minlen+alignment+slop doesn't go up
2635 * between the calls.
2636 */
2637 if (blen > mp->m_dalign && blen <= args.maxlen)
2638 nextminlen = blen - mp->m_dalign;
2639 else
2640 nextminlen = args.minlen;
2641 if (nextminlen + mp->m_dalign > args.minlen + 1)
2642 args.minalignslop =
2643 nextminlen + mp->m_dalign -
2644 args.minlen - 1;
2645 else
2646 args.minalignslop = 0;
2647 }
2648 } else {
2649 args.alignment = 1;
2650 args.minalignslop = 0;
2651 }
2652 args.minleft = ap->minleft;
2653 args.wasdel = ap->wasdel;
2654 args.isfl = 0;
2655 args.userdata = ap->userdata;
2656 if ((error = xfs_alloc_vextent(&args)))
2657 return error;
2658 if (tryagain && args.fsbno == NULLFSBLOCK) {
2659 /*
2660 * Exact allocation failed. Now try with alignment
2661 * turned on.
2662 */
2663 args.type = atype;
2664 args.fsbno = ap->rval;
2665 args.alignment = mp->m_dalign;
2666 args.minlen = nextminlen;
2667 args.minalignslop = 0;
2668 isaligned = 1;
2669 if ((error = xfs_alloc_vextent(&args)))
2670 return error;
2671 }
2672 if (isaligned && args.fsbno == NULLFSBLOCK) {
2673 /*
2674 * allocation failed, so turn off alignment and
2675 * try again.
2676 */
2677 args.type = atype;
2678 args.fsbno = ap->rval;
2679 args.alignment = 0;
2680 if ((error = xfs_alloc_vextent(&args)))
2681 return error;
2682 }
2683 if (args.fsbno == NULLFSBLOCK && nullfb &&
2684 args.minlen > ap->minlen) {
2685 args.minlen = ap->minlen;
2686 args.type = XFS_ALLOCTYPE_START_BNO;
2687 args.fsbno = ap->rval;
2688 if ((error = xfs_alloc_vextent(&args)))
2689 return error;
2690 }
2691 if (args.fsbno == NULLFSBLOCK && nullfb) {
2692 args.fsbno = 0;
2693 args.type = XFS_ALLOCTYPE_FIRST_AG;
2694 args.total = ap->minlen;
2695 args.minleft = 0;
2696 if ((error = xfs_alloc_vextent(&args)))
2697 return error;
2698 ap->low = 1;
2699 }
2700 if (args.fsbno != NULLFSBLOCK) {
2701 ap->firstblock = ap->rval = args.fsbno;
2702 ASSERT(nullfb || fb_agno == args.agno ||
2703 (ap->low && fb_agno < args.agno));
2704 ap->alen = args.len;
2705 ap->ip->i_d.di_nblocks += args.len;
2706 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2707 if (ap->wasdel)
2708 ap->ip->i_delayed_blks -= args.len;
2709 /*
2710 * Adjust the disk quota also. This was reserved
2711 * earlier.
2712 */
2713 xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
2714 ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
2715 XFS_TRANS_DQ_BCOUNT,
2716 (long) args.len);
2717 } else {
2718 ap->rval = NULLFSBLOCK;
2719 ap->alen = 0;
2720 }
2721 return 0;
2722 }
2723
2724 /*
2725 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
2726 * It figures out where to ask the underlying allocator to put the new extent.
2727 */
2728 STATIC int
2729 xfs_bmap_alloc(
2730 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2731 {
2732 if (XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata)
2733 return xfs_bmap_rtalloc(ap);
2734 return xfs_bmap_btalloc(ap);
2735 }
2736
2737 /*
2738 * Transform a btree format file with only one leaf node, where the
2739 * extents list will fit in the inode, into an extents format file.
2740 * Since the file extents are already in-core, all we have to do is
2741 * give up the space for the btree root and pitch the leaf block.
2742 */
2743 STATIC int /* error */
2744 xfs_bmap_btree_to_extents(
2745 xfs_trans_t *tp, /* transaction pointer */
2746 xfs_inode_t *ip, /* incore inode pointer */
2747 xfs_btree_cur_t *cur, /* btree cursor */
2748 int *logflagsp, /* inode logging flags */
2749 int whichfork) /* data or attr fork */
2750 {
2751 /* REFERENCED */
2752 struct xfs_btree_block *cblock;/* child btree block */
2753 xfs_fsblock_t cbno; /* child block number */
2754 xfs_buf_t *cbp; /* child block's buffer */
2755 int error; /* error return value */
2756 xfs_ifork_t *ifp; /* inode fork data */
2757 xfs_mount_t *mp; /* mount point structure */
2758 __be64 *pp; /* ptr to block address */
2759 struct xfs_btree_block *rblock;/* root btree block */
2760
2761 mp = ip->i_mount;
2762 ifp = XFS_IFORK_PTR(ip, whichfork);
2763 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
2764 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
2765 rblock = ifp->if_broot;
2766 ASSERT(be16_to_cpu(rblock->bb_level) == 1);
2767 ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
2768 ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1);
2769 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes);
2770 cbno = be64_to_cpu(*pp);
2771 *logflagsp = 0;
2772 #ifdef DEBUG
2773 if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
2774 return error;
2775 #endif
2776 if ((error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp,
2777 XFS_BMAP_BTREE_REF)))
2778 return error;
2779 cblock = XFS_BUF_TO_BLOCK(cbp);
2780 if ((error = xfs_btree_check_block(cur, cblock, 0, cbp)))
2781 return error;
2782 xfs_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
2783 ip->i_d.di_nblocks--;
2784 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
2785 xfs_trans_binval(tp, cbp);
2786 if (cur->bc_bufs[0] == cbp)
2787 cur->bc_bufs[0] = NULL;
2788 xfs_iroot_realloc(ip, -1, whichfork);
2789 ASSERT(ifp->if_broot == NULL);
2790 ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
2791 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
2792 *logflagsp = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
2793 return 0;
2794 }
2795
2796 /*
2797 * Called by xfs_bmapi to update file extent records and the btree
2798 * after removing space (or undoing a delayed allocation).
2799 */
2800 STATIC int /* error */
2801 xfs_bmap_del_extent(
2802 xfs_inode_t *ip, /* incore inode pointer */
2803 xfs_trans_t *tp, /* current transaction pointer */
2804 xfs_extnum_t *idx, /* extent number to update/delete */
2805 xfs_bmap_free_t *flist, /* list of extents to be freed */
2806 xfs_btree_cur_t *cur, /* if null, not a btree */
2807 xfs_bmbt_irec_t *del, /* data to remove from extents */
2808 int *logflagsp, /* inode logging flags */
2809 int whichfork) /* data or attr fork */
2810 {
2811 xfs_filblks_t da_new; /* new delay-alloc indirect blocks */
2812 xfs_filblks_t da_old; /* old delay-alloc indirect blocks */
2813 xfs_fsblock_t del_endblock=0; /* first block past del */
2814 xfs_fileoff_t del_endoff; /* first offset past del */
2815 int delay; /* current block is delayed allocated */
2816 int do_fx; /* free extent at end of routine */
2817 xfs_bmbt_rec_host_t *ep; /* current extent entry pointer */
2818 int error; /* error return value */
2819 int flags; /* inode logging flags */
2820 xfs_bmbt_irec_t got; /* current extent entry */
2821 xfs_fileoff_t got_endoff; /* first offset past got */
2822 int i; /* temp state */
2823 xfs_ifork_t *ifp; /* inode fork pointer */
2824 xfs_mount_t *mp; /* mount structure */
2825 xfs_filblks_t nblks; /* quota/sb block count */
2826 xfs_bmbt_irec_t new; /* new record to be inserted */
2827 /* REFERENCED */
2828 uint qfield; /* quota field to update */
2829 xfs_filblks_t temp; /* for indirect length calculations */
2830 xfs_filblks_t temp2; /* for indirect length calculations */
2831 int state = 0;
2832
2833 XFS_STATS_INC(xs_del_exlist);
2834
2835 if (whichfork == XFS_ATTR_FORK)
2836 state |= BMAP_ATTRFORK;
2837
2838 mp = ip->i_mount;
2839 ifp = XFS_IFORK_PTR(ip, whichfork);
2840 ASSERT((*idx >= 0) && (*idx < ifp->if_bytes /
2841 (uint)sizeof(xfs_bmbt_rec_t)));
2842 ASSERT(del->br_blockcount > 0);
2843 ep = xfs_iext_get_ext(ifp, *idx);
2844 xfs_bmbt_get_all(ep, &got);
2845 ASSERT(got.br_startoff <= del->br_startoff);
2846 del_endoff = del->br_startoff + del->br_blockcount;
2847 got_endoff = got.br_startoff + got.br_blockcount;
2848 ASSERT(got_endoff >= del_endoff);
2849 delay = isnullstartblock(got.br_startblock);
2850 ASSERT(isnullstartblock(del->br_startblock) == delay);
2851 flags = 0;
2852 qfield = 0;
2853 error = 0;
2854 /*
2855 * If deleting a real allocation, must free up the disk space.
2856 */
2857 if (!delay) {
2858 flags = XFS_ILOG_CORE;
2859 /*
2860 * Realtime allocation. Free it and record di_nblocks update.
2861 */
2862 if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
2863 xfs_fsblock_t bno;
2864 xfs_filblks_t len;
2865
2866 ASSERT(do_mod(del->br_blockcount,
2867 mp->m_sb.sb_rextsize) == 0);
2868 ASSERT(do_mod(del->br_startblock,
2869 mp->m_sb.sb_rextsize) == 0);
2870 bno = del->br_startblock;
2871 len = del->br_blockcount;
2872 do_div(bno, mp->m_sb.sb_rextsize);
2873 do_div(len, mp->m_sb.sb_rextsize);
2874 if ((error = xfs_rtfree_extent(ip->i_transp, bno,
2875 (xfs_extlen_t)len)))
2876 goto done;
2877 do_fx = 0;
2878 nblks = len * mp->m_sb.sb_rextsize;
2879 qfield = XFS_TRANS_DQ_RTBCOUNT;
2880 }
2881 /*
2882 * Ordinary allocation.
2883 */
2884 else {
2885 do_fx = 1;
2886 nblks = del->br_blockcount;
2887 qfield = XFS_TRANS_DQ_BCOUNT;
2888 }
2889 /*
2890 * Set up del_endblock and cur for later.
2891 */
2892 del_endblock = del->br_startblock + del->br_blockcount;
2893 if (cur) {
2894 if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
2895 got.br_startblock, got.br_blockcount,
2896 &i)))
2897 goto done;
2898 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2899 }
2900 da_old = da_new = 0;
2901 } else {
2902 da_old = startblockval(got.br_startblock);
2903 da_new = 0;
2904 nblks = 0;
2905 do_fx = 0;
2906 }
2907 /*
2908 * Set flag value to use in switch statement.
2909 * Left-contig is 2, right-contig is 1.
2910 */
2911 switch (((got.br_startoff == del->br_startoff) << 1) |
2912 (got_endoff == del_endoff)) {
2913 case 3:
2914 /*
2915 * Matches the whole extent. Delete the entry.
2916 */
2917 xfs_iext_remove(ip, *idx, 1,
2918 whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0);
2919 --*idx;
2920 if (delay)
2921 break;
2922
2923 XFS_IFORK_NEXT_SET(ip, whichfork,
2924 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
2925 flags |= XFS_ILOG_CORE;
2926 if (!cur) {
2927 flags |= xfs_ilog_fext(whichfork);
2928 break;
2929 }
2930 if ((error = xfs_btree_delete(cur, &i)))
2931 goto done;
2932 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2933 break;
2934
2935 case 2:
2936 /*
2937 * Deleting the first part of the extent.
2938 */
2939 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2940 xfs_bmbt_set_startoff(ep, del_endoff);
2941 temp = got.br_blockcount - del->br_blockcount;
2942 xfs_bmbt_set_blockcount(ep, temp);
2943 if (delay) {
2944 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2945 da_old);
2946 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
2947 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2948 da_new = temp;
2949 break;
2950 }
2951 xfs_bmbt_set_startblock(ep, del_endblock);
2952 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2953 if (!cur) {
2954 flags |= xfs_ilog_fext(whichfork);
2955 break;
2956 }
2957 if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
2958 got.br_blockcount - del->br_blockcount,
2959 got.br_state)))
2960 goto done;
2961 break;
2962
2963 case 1:
2964 /*
2965 * Deleting the last part of the extent.
2966 */
2967 temp = got.br_blockcount - del->br_blockcount;
2968 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2969 xfs_bmbt_set_blockcount(ep, temp);
2970 if (delay) {
2971 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2972 da_old);
2973 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
2974 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2975 da_new = temp;
2976 break;
2977 }
2978 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2979 if (!cur) {
2980 flags |= xfs_ilog_fext(whichfork);
2981 break;
2982 }
2983 if ((error = xfs_bmbt_update(cur, got.br_startoff,
2984 got.br_startblock,
2985 got.br_blockcount - del->br_blockcount,
2986 got.br_state)))
2987 goto done;
2988 break;
2989
2990 case 0:
2991 /*
2992 * Deleting the middle of the extent.
2993 */
2994 temp = del->br_startoff - got.br_startoff;
2995 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2996 xfs_bmbt_set_blockcount(ep, temp);
2997 new.br_startoff = del_endoff;
2998 temp2 = got_endoff - del_endoff;
2999 new.br_blockcount = temp2;
3000 new.br_state = got.br_state;
3001 if (!delay) {
3002 new.br_startblock = del_endblock;
3003 flags |= XFS_ILOG_CORE;
3004 if (cur) {
3005 if ((error = xfs_bmbt_update(cur,
3006 got.br_startoff,
3007 got.br_startblock, temp,
3008 got.br_state)))
3009 goto done;
3010 if ((error = xfs_btree_increment(cur, 0, &i)))
3011 goto done;
3012 cur->bc_rec.b = new;
3013 error = xfs_btree_insert(cur, &i);
3014 if (error && error != ENOSPC)
3015 goto done;
3016 /*
3017 * If get no-space back from btree insert,
3018 * it tried a split, and we have a zero
3019 * block reservation.
3020 * Fix up our state and return the error.
3021 */
3022 if (error == ENOSPC) {
3023 /*
3024 * Reset the cursor, don't trust
3025 * it after any insert operation.
3026 */
3027 if ((error = xfs_bmbt_lookup_eq(cur,
3028 got.br_startoff,
3029 got.br_startblock,
3030 temp, &i)))
3031 goto done;
3032 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
3033 /*
3034 * Update the btree record back
3035 * to the original value.
3036 */
3037 if ((error = xfs_bmbt_update(cur,
3038 got.br_startoff,
3039 got.br_startblock,
3040 got.br_blockcount,
3041 got.br_state)))
3042 goto done;
3043 /*
3044 * Reset the extent record back
3045 * to the original value.
3046 */
3047 xfs_bmbt_set_blockcount(ep,
3048 got.br_blockcount);
3049 flags = 0;
3050 error = XFS_ERROR(ENOSPC);
3051 goto done;
3052 }
3053 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
3054 } else
3055 flags |= xfs_ilog_fext(whichfork);
3056 XFS_IFORK_NEXT_SET(ip, whichfork,
3057 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
3058 } else {
3059 ASSERT(whichfork == XFS_DATA_FORK);
3060 temp = xfs_bmap_worst_indlen(ip, temp);
3061 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
3062 temp2 = xfs_bmap_worst_indlen(ip, temp2);
3063 new.br_startblock = nullstartblock((int)temp2);
3064 da_new = temp + temp2;
3065 while (da_new > da_old) {
3066 if (temp) {
3067 temp--;
3068 da_new--;
3069 xfs_bmbt_set_startblock(ep,
3070 nullstartblock((int)temp));
3071 }
3072 if (da_new == da_old)
3073 break;
3074 if (temp2) {
3075 temp2--;
3076 da_new--;
3077 new.br_startblock =
3078 nullstartblock((int)temp2);
3079 }
3080 }
3081 }
3082 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
3083 xfs_iext_insert(ip, *idx + 1, 1, &new, state);
3084 ++*idx;
3085 break;
3086 }
3087 /*
3088 * If we need to, add to list of extents to delete.
3089 */
3090 if (do_fx)
3091 xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
3092 mp);
3093 /*
3094 * Adjust inode # blocks in the file.
3095 */
3096 if (nblks)
3097 ip->i_d.di_nblocks -= nblks;
3098 /*
3099 * Adjust quota data.
3100 */
3101 if (qfield)
3102 xfs_trans_mod_dquot_byino(tp, ip, qfield, (long)-nblks);
3103
3104 /*
3105 * Account for change in delayed indirect blocks.
3106 * Nothing to do for disk quota accounting here.
3107 */
3108 ASSERT(da_old >= da_new);
3109 if (da_old > da_new) {
3110 xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
3111 (int64_t)(da_old - da_new), 0);
3112 }
3113 done:
3114 *logflagsp = flags;
3115 return error;
3116 }
3117
3118 /*
3119 * Remove the entry "free" from the free item list. Prev points to the
3120 * previous entry, unless "free" is the head of the list.
3121 */
3122 STATIC void
3123 xfs_bmap_del_free(
3124 xfs_bmap_free_t *flist, /* free item list header */
3125 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
3126 xfs_bmap_free_item_t *free) /* list item to be freed */
3127 {
3128 if (prev)
3129 prev->xbfi_next = free->xbfi_next;
3130 else
3131 flist->xbf_first = free->xbfi_next;
3132 flist->xbf_count--;
3133 kmem_zone_free(xfs_bmap_free_item_zone, free);
3134 }
3135
3136 /*
3137 * Convert an extents-format file into a btree-format file.
3138 * The new file will have a root block (in the inode) and a single child block.
3139 */
3140 STATIC int /* error */
3141 xfs_bmap_extents_to_btree(
3142 xfs_trans_t *tp, /* transaction pointer */
3143 xfs_inode_t *ip, /* incore inode pointer */
3144 xfs_fsblock_t *firstblock, /* first-block-allocated */
3145 xfs_bmap_free_t *flist, /* blocks freed in xaction */
3146 xfs_btree_cur_t **curp, /* cursor returned to caller */
3147 int wasdel, /* converting a delayed alloc */
3148 int *logflagsp, /* inode logging flags */
3149 int whichfork) /* data or attr fork */
3150 {
3151 struct xfs_btree_block *ablock; /* allocated (child) bt block */
3152 xfs_buf_t *abp; /* buffer for ablock */
3153 xfs_alloc_arg_t args; /* allocation arguments */
3154 xfs_bmbt_rec_t *arp; /* child record pointer */
3155 struct xfs_btree_block *block; /* btree root block */
3156 xfs_btree_cur_t *cur; /* bmap btree cursor */
3157 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3158 int error; /* error return value */
3159 xfs_extnum_t i, cnt; /* extent record index */
3160 xfs_ifork_t *ifp; /* inode fork pointer */
3161 xfs_bmbt_key_t *kp; /* root block key pointer */
3162 xfs_mount_t *mp; /* mount structure */
3163 xfs_extnum_t nextents; /* number of file extents */
3164 xfs_bmbt_ptr_t *pp; /* root block address pointer */
3165
3166 ifp = XFS_IFORK_PTR(ip, whichfork);
3167 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
3168 ASSERT(ifp->if_ext_max ==
3169 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
3170 /*
3171 * Make space in the inode incore.
3172 */
3173 xfs_iroot_realloc(ip, 1, whichfork);
3174 ifp->if_flags |= XFS_IFBROOT;
3175
3176 /*
3177 * Fill in the root.
3178 */
3179 block = ifp->if_broot;
3180 block->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3181 block->bb_level = cpu_to_be16(1);
3182 block->bb_numrecs = cpu_to_be16(1);
3183 block->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
3184 block->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
3185
3186 /*
3187 * Need a cursor. Can't allocate until bb_level is filled in.
3188 */
3189 mp = ip->i_mount;
3190 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
3191 cur->bc_private.b.firstblock = *firstblock;
3192 cur->bc_private.b.flist = flist;
3193 cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
3194 /*
3195 * Convert to a btree with two levels, one record in root.
3196 */
3197 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
3198 args.tp = tp;
3199 args.mp = mp;
3200 args.firstblock = *firstblock;
3201 if (*firstblock == NULLFSBLOCK) {
3202 args.type = XFS_ALLOCTYPE_START_BNO;
3203 args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
3204 } else if (flist->xbf_low) {
3205 args.type = XFS_ALLOCTYPE_START_BNO;
3206 args.fsbno = *firstblock;
3207 } else {
3208 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3209 args.fsbno = *firstblock;
3210 }
3211 args.minlen = args.maxlen = args.prod = 1;
3212 args.total = args.minleft = args.alignment = args.mod = args.isfl =
3213 args.minalignslop = 0;
3214 args.wasdel = wasdel;
3215 *logflagsp = 0;
3216 if ((error = xfs_alloc_vextent(&args))) {
3217 xfs_iroot_realloc(ip, -1, whichfork);
3218 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
3219 return error;
3220 }
3221 /*
3222 * Allocation can't fail, the space was reserved.
3223 */
3224 ASSERT(args.fsbno != NULLFSBLOCK);
3225 ASSERT(*firstblock == NULLFSBLOCK ||
3226 args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) ||
3227 (flist->xbf_low &&
3228 args.agno > XFS_FSB_TO_AGNO(mp, *firstblock)));
3229 *firstblock = cur->bc_private.b.firstblock = args.fsbno;
3230 cur->bc_private.b.allocated++;
3231 ip->i_d.di_nblocks++;
3232 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
3233 abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
3234 /*
3235 * Fill in the child block.
3236 */
3237 ablock = XFS_BUF_TO_BLOCK(abp);
3238 ablock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3239 ablock->bb_level = 0;
3240 ablock->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
3241 ablock->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
3242 arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
3243 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3244 for (cnt = i = 0; i < nextents; i++) {
3245 ep = xfs_iext_get_ext(ifp, i);
3246 if (!isnullstartblock(xfs_bmbt_get_startblock(ep))) {
3247 arp->l0 = cpu_to_be64(ep->l0);
3248 arp->l1 = cpu_to_be64(ep->l1);
3249 arp++; cnt++;
3250 }
3251 }
3252 ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
3253 xfs_btree_set_numrecs(ablock, cnt);
3254
3255 /*
3256 * Fill in the root key and pointer.
3257 */
3258 kp = XFS_BMBT_KEY_ADDR(mp, block, 1);
3259 arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
3260 kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
3261 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur,
3262 be16_to_cpu(block->bb_level)));
3263 *pp = cpu_to_be64(args.fsbno);
3264
3265 /*
3266 * Do all this logging at the end so that
3267 * the root is at the right level.
3268 */
3269 xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS);
3270 xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
3271 ASSERT(*curp == NULL);
3272 *curp = cur;
3273 *logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork);
3274 return 0;
3275 }
3276
3277 /*
3278 * Calculate the default attribute fork offset for newly created inodes.
3279 */
3280 uint
3281 xfs_default_attroffset(
3282 struct xfs_inode *ip)
3283 {
3284 struct xfs_mount *mp = ip->i_mount;
3285 uint offset;
3286
3287 if (mp->m_sb.sb_inodesize == 256) {
3288 offset = XFS_LITINO(mp) -
3289 XFS_BMDR_SPACE_CALC(MINABTPTRS);
3290 } else {
3291 offset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
3292 }
3293
3294 ASSERT(offset < XFS_LITINO(mp));
3295 return offset;
3296 }
3297
3298 /*
3299 * Helper routine to reset inode di_forkoff field when switching
3300 * attribute fork from local to extent format - we reset it where
3301 * possible to make space available for inline data fork extents.
3302 */
3303 STATIC void
3304 xfs_bmap_forkoff_reset(
3305 xfs_mount_t *mp,
3306 xfs_inode_t *ip,
3307 int whichfork)
3308 {
3309 if (whichfork == XFS_ATTR_FORK &&
3310 ip->i_d.di_format != XFS_DINODE_FMT_DEV &&
3311 ip->i_d.di_format != XFS_DINODE_FMT_UUID &&
3312 ip->i_d.di_format != XFS_DINODE_FMT_BTREE) {
3313 uint dfl_forkoff = xfs_default_attroffset(ip) >> 3;
3314
3315 if (dfl_forkoff > ip->i_d.di_forkoff) {
3316 ip->i_d.di_forkoff = dfl_forkoff;
3317 ip->i_df.if_ext_max =
3318 XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t);
3319 ip->i_afp->if_ext_max =
3320 XFS_IFORK_ASIZE(ip) / sizeof(xfs_bmbt_rec_t);
3321 }
3322 }
3323 }
3324
3325 /*
3326 * Convert a local file to an extents file.
3327 * This code is out of bounds for data forks of regular files,
3328 * since the file data needs to get logged so things will stay consistent.
3329 * (The bmap-level manipulations are ok, though).
3330 */
3331 STATIC int /* error */
3332 xfs_bmap_local_to_extents(
3333 xfs_trans_t *tp, /* transaction pointer */
3334 xfs_inode_t *ip, /* incore inode pointer */
3335 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
3336 xfs_extlen_t total, /* total blocks needed by transaction */
3337 int *logflagsp, /* inode logging flags */
3338 int whichfork) /* data or attr fork */
3339 {
3340 int error; /* error return value */
3341 int flags; /* logging flags returned */
3342 xfs_ifork_t *ifp; /* inode fork pointer */
3343
3344 /*
3345 * We don't want to deal with the case of keeping inode data inline yet.
3346 * So sending the data fork of a regular inode is invalid.
3347 */
3348 ASSERT(!((ip->i_d.di_mode & S_IFMT) == S_IFREG &&
3349 whichfork == XFS_DATA_FORK));
3350 ifp = XFS_IFORK_PTR(ip, whichfork);
3351 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
3352 flags = 0;
3353 error = 0;
3354 if (ifp->if_bytes) {
3355 xfs_alloc_arg_t args; /* allocation arguments */
3356 xfs_buf_t *bp; /* buffer for extent block */
3357 xfs_bmbt_rec_host_t *ep;/* extent record pointer */
3358
3359 args.tp = tp;
3360 args.mp = ip->i_mount;
3361 args.firstblock = *firstblock;
3362 ASSERT((ifp->if_flags &
3363 (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) == XFS_IFINLINE);
3364 /*
3365 * Allocate a block. We know we need only one, since the
3366 * file currently fits in an inode.
3367 */
3368 if (*firstblock == NULLFSBLOCK) {
3369 args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
3370 args.type = XFS_ALLOCTYPE_START_BNO;
3371 } else {
3372 args.fsbno = *firstblock;
3373 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3374 }
3375 args.total = total;
3376 args.mod = args.minleft = args.alignment = args.wasdel =
3377 args.isfl = args.minalignslop = 0;
3378 args.minlen = args.maxlen = args.prod = 1;
3379 if ((error = xfs_alloc_vextent(&args)))
3380 goto done;
3381 /*
3382 * Can't fail, the space was reserved.
3383 */
3384 ASSERT(args.fsbno != NULLFSBLOCK);
3385 ASSERT(args.len == 1);
3386 *firstblock = args.fsbno;
3387 bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
3388 memcpy((char *)XFS_BUF_PTR(bp), ifp->if_u1.if_data,
3389 ifp->if_bytes);
3390 xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
3391 xfs_bmap_forkoff_reset(args.mp, ip, whichfork);
3392 xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
3393 xfs_iext_add(ifp, 0, 1);
3394 ep = xfs_iext_get_ext(ifp, 0);
3395 xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
3396 trace_xfs_bmap_post_update(ip, 0,
3397 whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0,
3398 _THIS_IP_);
3399 XFS_IFORK_NEXT_SET(ip, whichfork, 1);
3400 ip->i_d.di_nblocks = 1;
3401 xfs_trans_mod_dquot_byino(tp, ip,
3402 XFS_TRANS_DQ_BCOUNT, 1L);
3403 flags |= xfs_ilog_fext(whichfork);
3404 } else {
3405 ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
3406 xfs_bmap_forkoff_reset(ip->i_mount, ip, whichfork);
3407 }
3408 ifp->if_flags &= ~XFS_IFINLINE;
3409 ifp->if_flags |= XFS_IFEXTENTS;
3410 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
3411 flags |= XFS_ILOG_CORE;
3412 done:
3413 *logflagsp = flags;
3414 return error;
3415 }
3416
3417 /*
3418 * Search the extent records for the entry containing block bno.
3419 * If bno lies in a hole, point to the next entry. If bno lies
3420 * past eof, *eofp will be set, and *prevp will contain the last
3421 * entry (null if none). Else, *lastxp will be set to the index
3422 * of the found entry; *gotp will contain the entry.
3423 */
3424 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
3425 xfs_bmap_search_multi_extents(
3426 xfs_ifork_t *ifp, /* inode fork pointer */
3427 xfs_fileoff_t bno, /* block number searched for */
3428 int *eofp, /* out: end of file found */
3429 xfs_extnum_t *lastxp, /* out: last extent index */
3430 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3431 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3432 {
3433 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3434 xfs_extnum_t lastx; /* last extent index */
3435
3436 /*
3437 * Initialize the extent entry structure to catch access to
3438 * uninitialized br_startblock field.
3439 */
3440 gotp->br_startoff = 0xffa5a5a5a5a5a5a5LL;
3441 gotp->br_blockcount = 0xa55a5a5a5a5a5a5aLL;
3442 gotp->br_state = XFS_EXT_INVALID;
3443 #if XFS_BIG_BLKNOS
3444 gotp->br_startblock = 0xffffa5a5a5a5a5a5LL;
3445 #else
3446 gotp->br_startblock = 0xffffa5a5;
3447 #endif
3448 prevp->br_startoff = NULLFILEOFF;
3449
3450 ep = xfs_iext_bno_to_ext(ifp, bno, &lastx);
3451 if (lastx > 0) {
3452 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx - 1), prevp);
3453 }
3454 if (lastx < (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
3455 xfs_bmbt_get_all(ep, gotp);
3456 *eofp = 0;
3457 } else {
3458 if (lastx > 0) {
3459 *gotp = *prevp;
3460 }
3461 *eofp = 1;
3462 ep = NULL;
3463 }
3464 *lastxp = lastx;
3465 return ep;
3466 }
3467
3468 /*
3469 * Search the extents list for the inode, for the extent containing bno.
3470 * If bno lies in a hole, point to the next entry. If bno lies past eof,
3471 * *eofp will be set, and *prevp will contain the last entry (null if none).
3472 * Else, *lastxp will be set to the index of the found
3473 * entry; *gotp will contain the entry.
3474 */
3475 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
3476 xfs_bmap_search_extents(
3477 xfs_inode_t *ip, /* incore inode pointer */
3478 xfs_fileoff_t bno, /* block number searched for */
3479 int fork, /* data or attr fork */
3480 int *eofp, /* out: end of file found */
3481 xfs_extnum_t *lastxp, /* out: last extent index */
3482 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3483 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3484 {
3485 xfs_ifork_t *ifp; /* inode fork pointer */
3486 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3487
3488 XFS_STATS_INC(xs_look_exlist);
3489 ifp = XFS_IFORK_PTR(ip, fork);
3490
3491 ep = xfs_bmap_search_multi_extents(ifp, bno, eofp, lastxp, gotp, prevp);
3492
3493 if (unlikely(!(gotp->br_startblock) && (*lastxp != NULLEXTNUM) &&
3494 !(XFS_IS_REALTIME_INODE(ip) && fork == XFS_DATA_FORK))) {
3495 xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO,
3496 "Access to block zero in inode %llu "
3497 "start_block: %llx start_off: %llx "
3498 "blkcnt: %llx extent-state: %x lastx: %x\n",
3499 (unsigned long long)ip->i_ino,
3500 (unsigned long long)gotp->br_startblock,
3501 (unsigned long long)gotp->br_startoff,
3502 (unsigned long long)gotp->br_blockcount,
3503 gotp->br_state, *lastxp);
3504 *lastxp = NULLEXTNUM;
3505 *eofp = 1;
3506 return NULL;
3507 }
3508 return ep;
3509 }
3510
3511 /*
3512 * Compute the worst-case number of indirect blocks that will be used
3513 * for ip's delayed extent of length "len".
3514 */
3515 STATIC xfs_filblks_t
3516 xfs_bmap_worst_indlen(
3517 xfs_inode_t *ip, /* incore inode pointer */
3518 xfs_filblks_t len) /* delayed extent length */
3519 {
3520 int level; /* btree level number */
3521 int maxrecs; /* maximum record count at this level */
3522 xfs_mount_t *mp; /* mount structure */
3523 xfs_filblks_t rval; /* return value */
3524
3525 mp = ip->i_mount;
3526 maxrecs = mp->m_bmap_dmxr[0];
3527 for (level = 0, rval = 0;
3528 level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
3529 level++) {
3530 len += maxrecs - 1;
3531 do_div(len, maxrecs);
3532 rval += len;
3533 if (len == 1)
3534 return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
3535 level - 1;
3536 if (level == 0)
3537 maxrecs = mp->m_bmap_dmxr[1];
3538 }
3539 return rval;
3540 }
3541
3542 /*
3543 * Convert inode from non-attributed to attributed.
3544 * Must not be in a transaction, ip must not be locked.
3545 */
3546 int /* error code */
3547 xfs_bmap_add_attrfork(
3548 xfs_inode_t *ip, /* incore inode pointer */
3549 int size, /* space new attribute needs */
3550 int rsvd) /* xact may use reserved blks */
3551 {
3552 xfs_fsblock_t firstblock; /* 1st block/ag allocated */
3553 xfs_bmap_free_t flist; /* freed extent records */
3554 xfs_mount_t *mp; /* mount structure */
3555 xfs_trans_t *tp; /* transaction pointer */
3556 int blks; /* space reservation */
3557 int version = 1; /* superblock attr version */
3558 int committed; /* xaction was committed */
3559 int logflags; /* logging flags */
3560 int error; /* error return value */
3561
3562 ASSERT(XFS_IFORK_Q(ip) == 0);
3563 ASSERT(ip->i_df.if_ext_max ==
3564 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3565
3566 mp = ip->i_mount;
3567 ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
3568 tp = xfs_trans_alloc(mp, XFS_TRANS_ADDAFORK);
3569 blks = XFS_ADDAFORK_SPACE_RES(mp);
3570 if (rsvd)
3571 tp->t_flags |= XFS_TRANS_RESERVE;
3572 if ((error = xfs_trans_reserve(tp, blks, XFS_ADDAFORK_LOG_RES(mp), 0,
3573 XFS_TRANS_PERM_LOG_RES, XFS_ADDAFORK_LOG_COUNT)))
3574 goto error0;
3575 xfs_ilock(ip, XFS_ILOCK_EXCL);
3576 error = xfs_trans_reserve_quota_nblks(tp, ip, blks, 0, rsvd ?
3577 XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
3578 XFS_QMOPT_RES_REGBLKS);
3579 if (error) {
3580 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3581 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
3582 return error;
3583 }
3584 if (XFS_IFORK_Q(ip))
3585 goto error1;
3586 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
3587 /*
3588 * For inodes coming from pre-6.2 filesystems.
3589 */
3590 ASSERT(ip->i_d.di_aformat == 0);
3591 ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
3592 }
3593 ASSERT(ip->i_d.di_anextents == 0);
3594
3595 xfs_trans_ijoin_ref(tp, ip, XFS_ILOCK_EXCL);
3596 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
3597
3598 switch (ip->i_d.di_format) {
3599 case XFS_DINODE_FMT_DEV:
3600 ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
3601 break;
3602 case XFS_DINODE_FMT_UUID:
3603 ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
3604 break;
3605 case XFS_DINODE_FMT_LOCAL:
3606 case XFS_DINODE_FMT_EXTENTS:
3607 case XFS_DINODE_FMT_BTREE:
3608 ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
3609 if (!ip->i_d.di_forkoff)
3610 ip->i_d.di_forkoff = xfs_default_attroffset(ip) >> 3;
3611 else if (mp->m_flags & XFS_MOUNT_ATTR2)
3612 version = 2;
3613 break;
3614 default:
3615 ASSERT(0);
3616 error = XFS_ERROR(EINVAL);
3617 goto error1;
3618 }
3619 ip->i_df.if_ext_max =
3620 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
3621 ASSERT(ip->i_afp == NULL);
3622 ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
3623 ip->i_afp->if_ext_max =
3624 XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
3625 ip->i_afp->if_flags = XFS_IFEXTENTS;
3626 logflags = 0;
3627 xfs_bmap_init(&flist, &firstblock);
3628 switch (ip->i_d.di_format) {
3629 case XFS_DINODE_FMT_LOCAL:
3630 error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &flist,
3631 &logflags);
3632 break;
3633 case XFS_DINODE_FMT_EXTENTS:
3634 error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
3635 &flist, &logflags);
3636 break;
3637 case XFS_DINODE_FMT_BTREE:
3638 error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &flist,
3639 &logflags);
3640 break;
3641 default:
3642 error = 0;
3643 break;
3644 }
3645 if (logflags)
3646 xfs_trans_log_inode(tp, ip, logflags);
3647 if (error)
3648 goto error2;
3649 if (!xfs_sb_version_hasattr(&mp->m_sb) ||
3650 (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2)) {
3651 __int64_t sbfields = 0;
3652
3653 spin_lock(&mp->m_sb_lock);
3654 if (!xfs_sb_version_hasattr(&mp->m_sb)) {
3655 xfs_sb_version_addattr(&mp->m_sb);
3656 sbfields |= XFS_SB_VERSIONNUM;
3657 }
3658 if (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2) {
3659 xfs_sb_version_addattr2(&mp->m_sb);
3660 sbfields |= (XFS_SB_VERSIONNUM | XFS_SB_FEATURES2);
3661 }
3662 if (sbfields) {
3663 spin_unlock(&mp->m_sb_lock);
3664 xfs_mod_sb(tp, sbfields);
3665 } else
3666 spin_unlock(&mp->m_sb_lock);
3667 }
3668 if ((error = xfs_bmap_finish(&tp, &flist, &committed)))
3669 goto error2;
3670 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
3671 ASSERT(ip->i_df.if_ext_max ==
3672 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3673 return error;
3674 error2:
3675 xfs_bmap_cancel(&flist);
3676 error1:
3677 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3678 error0:
3679 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
3680 ASSERT(ip->i_df.if_ext_max ==
3681 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3682 return error;
3683 }
3684
3685 /*
3686 * Add the extent to the list of extents to be free at transaction end.
3687 * The list is maintained sorted (by block number).
3688 */
3689 /* ARGSUSED */
3690 void
3691 xfs_bmap_add_free(
3692 xfs_fsblock_t bno, /* fs block number of extent */
3693 xfs_filblks_t len, /* length of extent */
3694 xfs_bmap_free_t *flist, /* list of extents */
3695 xfs_mount_t *mp) /* mount point structure */
3696 {
3697 xfs_bmap_free_item_t *cur; /* current (next) element */
3698 xfs_bmap_free_item_t *new; /* new element */
3699 xfs_bmap_free_item_t *prev; /* previous element */
3700 #ifdef DEBUG
3701 xfs_agnumber_t agno;
3702 xfs_agblock_t agbno;
3703
3704 ASSERT(bno != NULLFSBLOCK);
3705 ASSERT(len > 0);
3706 ASSERT(len <= MAXEXTLEN);
3707 ASSERT(!isnullstartblock(bno));
3708 agno = XFS_FSB_TO_AGNO(mp, bno);
3709 agbno = XFS_FSB_TO_AGBNO(mp, bno);
3710 ASSERT(agno < mp->m_sb.sb_agcount);
3711 ASSERT(agbno < mp->m_sb.sb_agblocks);
3712 ASSERT(len < mp->m_sb.sb_agblocks);
3713 ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
3714 #endif
3715 ASSERT(xfs_bmap_free_item_zone != NULL);
3716 new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
3717 new->xbfi_startblock = bno;
3718 new->xbfi_blockcount = (xfs_extlen_t)len;
3719 for (prev = NULL, cur = flist->xbf_first;
3720 cur != NULL;
3721 prev = cur, cur = cur->xbfi_next) {
3722 if (cur->xbfi_startblock >= bno)
3723 break;
3724 }
3725 if (prev)
3726 prev->xbfi_next = new;
3727 else
3728 flist->xbf_first = new;
3729 new->xbfi_next = cur;
3730 flist->xbf_count++;
3731 }
3732
3733 /*
3734 * Compute and fill in the value of the maximum depth of a bmap btree
3735 * in this filesystem. Done once, during mount.
3736 */
3737 void
3738 xfs_bmap_compute_maxlevels(
3739 xfs_mount_t *mp, /* file system mount structure */
3740 int whichfork) /* data or attr fork */
3741 {
3742 int level; /* btree level */
3743 uint maxblocks; /* max blocks at this level */
3744 uint maxleafents; /* max leaf entries possible */
3745 int maxrootrecs; /* max records in root block */
3746 int minleafrecs; /* min records in leaf block */
3747 int minnoderecs; /* min records in node block */
3748 int sz; /* root block size */
3749
3750 /*
3751 * The maximum number of extents in a file, hence the maximum
3752 * number of leaf entries, is controlled by the type of di_nextents
3753 * (a signed 32-bit number, xfs_extnum_t), or by di_anextents
3754 * (a signed 16-bit number, xfs_aextnum_t).
3755 *
3756 * Note that we can no longer assume that if we are in ATTR1 that
3757 * the fork offset of all the inodes will be
3758 * (xfs_default_attroffset(ip) >> 3) because we could have mounted
3759 * with ATTR2 and then mounted back with ATTR1, keeping the
3760 * di_forkoff's fixed but probably at various positions. Therefore,
3761 * for both ATTR1 and ATTR2 we have to assume the worst case scenario
3762 * of a minimum size available.
3763 */
3764 if (whichfork == XFS_DATA_FORK) {
3765 maxleafents = MAXEXTNUM;
3766 sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
3767 } else {
3768 maxleafents = MAXAEXTNUM;
3769 sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
3770 }
3771 maxrootrecs = xfs_bmdr_maxrecs(mp, sz, 0);
3772 minleafrecs = mp->m_bmap_dmnr[0];
3773 minnoderecs = mp->m_bmap_dmnr[1];
3774 maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
3775 for (level = 1; maxblocks > 1; level++) {
3776 if (maxblocks <= maxrootrecs)
3777 maxblocks = 1;
3778 else
3779 maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
3780 }
3781 mp->m_bm_maxlevels[whichfork] = level;
3782 }
3783
3784 /*
3785 * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
3786 * caller. Frees all the extents that need freeing, which must be done
3787 * last due to locking considerations. We never free any extents in
3788 * the first transaction. This is to allow the caller to make the first
3789 * transaction a synchronous one so that the pointers to the data being
3790 * broken in this transaction will be permanent before the data is actually
3791 * freed. This is necessary to prevent blocks from being reallocated
3792 * and written to before the free and reallocation are actually permanent.
3793 * We do not just make the first transaction synchronous here, because
3794 * there are more efficient ways to gain the same protection in some cases
3795 * (see the file truncation code).
3796 *
3797 * Return 1 if the given transaction was committed and a new one
3798 * started, and 0 otherwise in the committed parameter.
3799 */
3800 /*ARGSUSED*/
3801 int /* error */
3802 xfs_bmap_finish(
3803 xfs_trans_t **tp, /* transaction pointer addr */
3804 xfs_bmap_free_t *flist, /* i/o: list extents to free */
3805 int *committed) /* xact committed or not */
3806 {
3807 xfs_efd_log_item_t *efd; /* extent free data */
3808 xfs_efi_log_item_t *efi; /* extent free intention */
3809 int error; /* error return value */
3810 xfs_bmap_free_item_t *free; /* free extent item */
3811 unsigned int logres; /* new log reservation */
3812 unsigned int logcount; /* new log count */
3813 xfs_mount_t *mp; /* filesystem mount structure */
3814 xfs_bmap_free_item_t *next; /* next item on free list */
3815 xfs_trans_t *ntp; /* new transaction pointer */
3816
3817 ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
3818 if (flist->xbf_count == 0) {
3819 *committed = 0;
3820 return 0;
3821 }
3822 ntp = *tp;
3823 efi = xfs_trans_get_efi(ntp, flist->xbf_count);
3824 for (free = flist->xbf_first; free; free = free->xbfi_next)
3825 xfs_trans_log_efi_extent(ntp, efi, free->xbfi_startblock,
3826 free->xbfi_blockcount);
3827 logres = ntp->t_log_res;
3828 logcount = ntp->t_log_count;
3829 ntp = xfs_trans_dup(*tp);
3830 error = xfs_trans_commit(*tp, 0);
3831 *tp = ntp;
3832 *committed = 1;
3833 /*
3834 * We have a new transaction, so we should return committed=1,
3835 * even though we're returning an error.
3836 */
3837 if (error)
3838 return error;
3839
3840 /*
3841 * transaction commit worked ok so we can drop the extra ticket
3842 * reference that we gained in xfs_trans_dup()
3843 */
3844 xfs_log_ticket_put(ntp->t_ticket);
3845
3846 if ((error = xfs_trans_reserve(ntp, 0, logres, 0, XFS_TRANS_PERM_LOG_RES,
3847 logcount)))
3848 return error;
3849 efd = xfs_trans_get_efd(ntp, efi, flist->xbf_count);
3850 for (free = flist->xbf_first; free != NULL; free = next) {
3851 next = free->xbfi_next;
3852 if ((error = xfs_free_extent(ntp, free->xbfi_startblock,
3853 free->xbfi_blockcount))) {
3854 /*
3855 * The bmap free list will be cleaned up at a
3856 * higher level. The EFI will be canceled when
3857 * this transaction is aborted.
3858 * Need to force shutdown here to make sure it
3859 * happens, since this transaction may not be
3860 * dirty yet.
3861 */
3862 mp = ntp->t_mountp;
3863 if (!XFS_FORCED_SHUTDOWN(mp))
3864 xfs_force_shutdown(mp,
3865 (error == EFSCORRUPTED) ?
3866 SHUTDOWN_CORRUPT_INCORE :
3867 SHUTDOWN_META_IO_ERROR);
3868 return error;
3869 }
3870 xfs_trans_log_efd_extent(ntp, efd, free->xbfi_startblock,
3871 free->xbfi_blockcount);
3872 xfs_bmap_del_free(flist, NULL, free);
3873 }
3874 return 0;
3875 }
3876
3877 /*
3878 * Free up any items left in the list.
3879 */
3880 void
3881 xfs_bmap_cancel(
3882 xfs_bmap_free_t *flist) /* list of bmap_free_items */
3883 {
3884 xfs_bmap_free_item_t *free; /* free list item */
3885 xfs_bmap_free_item_t *next;
3886
3887 if (flist->xbf_count == 0)
3888 return;
3889 ASSERT(flist->xbf_first != NULL);
3890 for (free = flist->xbf_first; free; free = next) {
3891 next = free->xbfi_next;
3892 xfs_bmap_del_free(flist, NULL, free);
3893 }
3894 ASSERT(flist->xbf_count == 0);
3895 }
3896
3897 /*
3898 * Returns the file-relative block number of the first unused block(s)
3899 * in the file with at least "len" logically contiguous blocks free.
3900 * This is the lowest-address hole if the file has holes, else the first block
3901 * past the end of file.
3902 * Return 0 if the file is currently local (in-inode).
3903 */
3904 int /* error */
3905 xfs_bmap_first_unused(
3906 xfs_trans_t *tp, /* transaction pointer */
3907 xfs_inode_t *ip, /* incore inode */
3908 xfs_extlen_t len, /* size of hole to find */
3909 xfs_fileoff_t *first_unused, /* unused block */
3910 int whichfork) /* data or attr fork */
3911 {
3912 int error; /* error return value */
3913 int idx; /* extent record index */
3914 xfs_ifork_t *ifp; /* inode fork pointer */
3915 xfs_fileoff_t lastaddr; /* last block number seen */
3916 xfs_fileoff_t lowest; /* lowest useful block */
3917 xfs_fileoff_t max; /* starting useful block */
3918 xfs_fileoff_t off; /* offset for this block */
3919 xfs_extnum_t nextents; /* number of extent entries */
3920
3921 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
3922 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
3923 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
3924 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
3925 *first_unused = 0;
3926 return 0;
3927 }
3928 ifp = XFS_IFORK_PTR(ip, whichfork);
3929 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
3930 (error = xfs_iread_extents(tp, ip, whichfork)))
3931 return error;
3932 lowest = *first_unused;
3933 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3934 for (idx = 0, lastaddr = 0, max = lowest; idx < nextents; idx++) {
3935 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
3936 off = xfs_bmbt_get_startoff(ep);
3937 /*
3938 * See if the hole before this extent will work.
3939 */
3940 if (off >= lowest + len && off - max >= len) {
3941 *first_unused = max;
3942 return 0;
3943 }
3944 lastaddr = off + xfs_bmbt_get_blockcount(ep);
3945 max = XFS_FILEOFF_MAX(lastaddr, lowest);
3946 }
3947 *first_unused = max;
3948 return 0;
3949 }
3950
3951 /*
3952 * Returns the file-relative block number of the last block + 1 before
3953 * last_block (input value) in the file.
3954 * This is not based on i_size, it is based on the extent records.
3955 * Returns 0 for local files, as they do not have extent records.
3956 */
3957 int /* error */
3958 xfs_bmap_last_before(
3959 xfs_trans_t *tp, /* transaction pointer */
3960 xfs_inode_t *ip, /* incore inode */
3961 xfs_fileoff_t *last_block, /* last block */
3962 int whichfork) /* data or attr fork */
3963 {
3964 xfs_fileoff_t bno; /* input file offset */
3965 int eof; /* hit end of file */
3966 xfs_bmbt_rec_host_t *ep; /* pointer to last extent */
3967 int error; /* error return value */
3968 xfs_bmbt_irec_t got; /* current extent value */
3969 xfs_ifork_t *ifp; /* inode fork pointer */
3970 xfs_extnum_t lastx; /* last extent used */
3971 xfs_bmbt_irec_t prev; /* previous extent value */
3972
3973 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
3974 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
3975 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
3976 return XFS_ERROR(EIO);
3977 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
3978 *last_block = 0;
3979 return 0;
3980 }
3981 ifp = XFS_IFORK_PTR(ip, whichfork);
3982 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
3983 (error = xfs_iread_extents(tp, ip, whichfork)))
3984 return error;
3985 bno = *last_block - 1;
3986 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
3987 &prev);
3988 if (eof || xfs_bmbt_get_startoff(ep) > bno) {
3989 if (prev.br_startoff == NULLFILEOFF)
3990 *last_block = 0;
3991 else
3992 *last_block = prev.br_startoff + prev.br_blockcount;
3993 }
3994 /*
3995 * Otherwise *last_block is already the right answer.
3996 */
3997 return 0;
3998 }
3999
4000 /*
4001 * Returns the file-relative block number of the first block past eof in
4002 * the file. This is not based on i_size, it is based on the extent records.
4003 * Returns 0 for local files, as they do not have extent records.
4004 */
4005 int /* error */
4006 xfs_bmap_last_offset(
4007 xfs_trans_t *tp, /* transaction pointer */
4008 xfs_inode_t *ip, /* incore inode */
4009 xfs_fileoff_t *last_block, /* last block */
4010 int whichfork) /* data or attr fork */
4011 {
4012 xfs_bmbt_rec_host_t *ep; /* pointer to last extent */
4013 int error; /* error return value */
4014 xfs_ifork_t *ifp; /* inode fork pointer */
4015 xfs_extnum_t nextents; /* number of extent entries */
4016
4017 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4018 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4019 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
4020 return XFS_ERROR(EIO);
4021 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4022 *last_block = 0;
4023 return 0;
4024 }
4025 ifp = XFS_IFORK_PTR(ip, whichfork);
4026 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4027 (error = xfs_iread_extents(tp, ip, whichfork)))
4028 return error;
4029 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4030 if (!nextents) {
4031 *last_block = 0;
4032 return 0;
4033 }
4034 ep = xfs_iext_get_ext(ifp, nextents - 1);
4035 *last_block = xfs_bmbt_get_startoff(ep) + xfs_bmbt_get_blockcount(ep);
4036 return 0;
4037 }
4038
4039 /*
4040 * Returns whether the selected fork of the inode has exactly one
4041 * block or not. For the data fork we check this matches di_size,
4042 * implying the file's range is 0..bsize-1.
4043 */
4044 int /* 1=>1 block, 0=>otherwise */
4045 xfs_bmap_one_block(
4046 xfs_inode_t *ip, /* incore inode */
4047 int whichfork) /* data or attr fork */
4048 {
4049 xfs_bmbt_rec_host_t *ep; /* ptr to fork's extent */
4050 xfs_ifork_t *ifp; /* inode fork pointer */
4051 int rval; /* return value */
4052 xfs_bmbt_irec_t s; /* internal version of extent */
4053
4054 #ifndef DEBUG
4055 if (whichfork == XFS_DATA_FORK) {
4056 return ((ip->i_d.di_mode & S_IFMT) == S_IFREG) ?
4057 (ip->i_size == ip->i_mount->m_sb.sb_blocksize) :
4058 (ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize);
4059 }
4060 #endif /* !DEBUG */
4061 if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
4062 return 0;
4063 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
4064 return 0;
4065 ifp = XFS_IFORK_PTR(ip, whichfork);
4066 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
4067 ep = xfs_iext_get_ext(ifp, 0);
4068 xfs_bmbt_get_all(ep, &s);
4069 rval = s.br_startoff == 0 && s.br_blockcount == 1;
4070 if (rval && whichfork == XFS_DATA_FORK)
4071 ASSERT(ip->i_size == ip->i_mount->m_sb.sb_blocksize);
4072 return rval;
4073 }
4074
4075 STATIC int
4076 xfs_bmap_sanity_check(
4077 struct xfs_mount *mp,
4078 struct xfs_buf *bp,
4079 int level)
4080 {
4081 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
4082
4083 if (be32_to_cpu(block->bb_magic) != XFS_BMAP_MAGIC ||
4084 be16_to_cpu(block->bb_level) != level ||
4085 be16_to_cpu(block->bb_numrecs) == 0 ||
4086 be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
4087 return 0;
4088 return 1;
4089 }
4090
4091 /*
4092 * Read in the extents to if_extents.
4093 * All inode fields are set up by caller, we just traverse the btree
4094 * and copy the records in. If the file system cannot contain unwritten
4095 * extents, the records are checked for no "state" flags.
4096 */
4097 int /* error */
4098 xfs_bmap_read_extents(
4099 xfs_trans_t *tp, /* transaction pointer */
4100 xfs_inode_t *ip, /* incore inode */
4101 int whichfork) /* data or attr fork */
4102 {
4103 struct xfs_btree_block *block; /* current btree block */
4104 xfs_fsblock_t bno; /* block # of "block" */
4105 xfs_buf_t *bp; /* buffer for "block" */
4106 int error; /* error return value */
4107 xfs_exntfmt_t exntf; /* XFS_EXTFMT_NOSTATE, if checking */
4108 xfs_extnum_t i, j; /* index into the extents list */
4109 xfs_ifork_t *ifp; /* fork structure */
4110 int level; /* btree level, for checking */
4111 xfs_mount_t *mp; /* file system mount structure */
4112 __be64 *pp; /* pointer to block address */
4113 /* REFERENCED */
4114 xfs_extnum_t room; /* number of entries there's room for */
4115
4116 bno = NULLFSBLOCK;
4117 mp = ip->i_mount;
4118 ifp = XFS_IFORK_PTR(ip, whichfork);
4119 exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE :
4120 XFS_EXTFMT_INODE(ip);
4121 block = ifp->if_broot;
4122 /*
4123 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
4124 */
4125 level = be16_to_cpu(block->bb_level);
4126 ASSERT(level > 0);
4127 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
4128 bno = be64_to_cpu(*pp);
4129 ASSERT(bno != NULLDFSBNO);
4130 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
4131 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
4132 /*
4133 * Go down the tree until leaf level is reached, following the first
4134 * pointer (leftmost) at each level.
4135 */
4136 while (level-- > 0) {
4137 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4138 XFS_BMAP_BTREE_REF)))
4139 return error;
4140 block = XFS_BUF_TO_BLOCK(bp);
4141 XFS_WANT_CORRUPTED_GOTO(
4142 xfs_bmap_sanity_check(mp, bp, level),
4143 error0);
4144 if (level == 0)
4145 break;
4146 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
4147 bno = be64_to_cpu(*pp);
4148 XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
4149 xfs_trans_brelse(tp, bp);
4150 }
4151 /*
4152 * Here with bp and block set to the leftmost leaf node in the tree.
4153 */
4154 room = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4155 i = 0;
4156 /*
4157 * Loop over all leaf nodes. Copy information to the extent records.
4158 */
4159 for (;;) {
4160 xfs_bmbt_rec_t *frp;
4161 xfs_fsblock_t nextbno;
4162 xfs_extnum_t num_recs;
4163 xfs_extnum_t start;
4164
4165
4166 num_recs = xfs_btree_get_numrecs(block);
4167 if (unlikely(i + num_recs > room)) {
4168 ASSERT(i + num_recs <= room);
4169 xfs_warn(ip->i_mount,
4170 "corrupt dinode %Lu, (btree extents).",
4171 (unsigned long long) ip->i_ino);
4172 XFS_CORRUPTION_ERROR("xfs_bmap_read_extents(1)",
4173 XFS_ERRLEVEL_LOW, ip->i_mount, block);
4174 goto error0;
4175 }
4176 XFS_WANT_CORRUPTED_GOTO(
4177 xfs_bmap_sanity_check(mp, bp, 0),
4178 error0);
4179 /*
4180 * Read-ahead the next leaf block, if any.
4181 */
4182 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
4183 if (nextbno != NULLFSBLOCK)
4184 xfs_btree_reada_bufl(mp, nextbno, 1);
4185 /*
4186 * Copy records into the extent records.
4187 */
4188 frp = XFS_BMBT_REC_ADDR(mp, block, 1);
4189 start = i;
4190 for (j = 0; j < num_recs; j++, i++, frp++) {
4191 xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i);
4192 trp->l0 = be64_to_cpu(frp->l0);
4193 trp->l1 = be64_to_cpu(frp->l1);
4194 }
4195 if (exntf == XFS_EXTFMT_NOSTATE) {
4196 /*
4197 * Check all attribute bmap btree records and
4198 * any "older" data bmap btree records for a
4199 * set bit in the "extent flag" position.
4200 */
4201 if (unlikely(xfs_check_nostate_extents(ifp,
4202 start, num_recs))) {
4203 XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
4204 XFS_ERRLEVEL_LOW,
4205 ip->i_mount);
4206 goto error0;
4207 }
4208 }
4209 xfs_trans_brelse(tp, bp);
4210 bno = nextbno;
4211 /*
4212 * If we've reached the end, stop.
4213 */
4214 if (bno == NULLFSBLOCK)
4215 break;
4216 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4217 XFS_BMAP_BTREE_REF)))
4218 return error;
4219 block = XFS_BUF_TO_BLOCK(bp);
4220 }
4221 ASSERT(i == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
4222 ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork));
4223 XFS_BMAP_TRACE_EXLIST(ip, i, whichfork);
4224 return 0;
4225 error0:
4226 xfs_trans_brelse(tp, bp);
4227 return XFS_ERROR(EFSCORRUPTED);
4228 }
4229
4230 #ifdef DEBUG
4231 /*
4232 * Add bmap trace insert entries for all the contents of the extent records.
4233 */
4234 void
4235 xfs_bmap_trace_exlist(
4236 xfs_inode_t *ip, /* incore inode pointer */
4237 xfs_extnum_t cnt, /* count of entries in the list */
4238 int whichfork, /* data or attr fork */
4239 unsigned long caller_ip)
4240 {
4241 xfs_extnum_t idx; /* extent record index */
4242 xfs_ifork_t *ifp; /* inode fork pointer */
4243 int state = 0;
4244
4245 if (whichfork == XFS_ATTR_FORK)
4246 state |= BMAP_ATTRFORK;
4247
4248 ifp = XFS_IFORK_PTR(ip, whichfork);
4249 ASSERT(cnt == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
4250 for (idx = 0; idx < cnt; idx++)
4251 trace_xfs_extlist(ip, idx, whichfork, caller_ip);
4252 }
4253
4254 /*
4255 * Validate that the bmbt_irecs being returned from bmapi are valid
4256 * given the callers original parameters. Specifically check the
4257 * ranges of the returned irecs to ensure that they only extent beyond
4258 * the given parameters if the XFS_BMAPI_ENTIRE flag was set.
4259 */
4260 STATIC void
4261 xfs_bmap_validate_ret(
4262 xfs_fileoff_t bno,
4263 xfs_filblks_t len,
4264 int flags,
4265 xfs_bmbt_irec_t *mval,
4266 int nmap,
4267 int ret_nmap)
4268 {
4269 int i; /* index to map values */
4270
4271 ASSERT(ret_nmap <= nmap);
4272
4273 for (i = 0; i < ret_nmap; i++) {
4274 ASSERT(mval[i].br_blockcount > 0);
4275 if (!(flags & XFS_BMAPI_ENTIRE)) {
4276 ASSERT(mval[i].br_startoff >= bno);
4277 ASSERT(mval[i].br_blockcount <= len);
4278 ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
4279 bno + len);
4280 } else {
4281 ASSERT(mval[i].br_startoff < bno + len);
4282 ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
4283 bno);
4284 }
4285 ASSERT(i == 0 ||
4286 mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
4287 mval[i].br_startoff);
4288 if ((flags & XFS_BMAPI_WRITE) && !(flags & XFS_BMAPI_DELAY))
4289 ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
4290 mval[i].br_startblock != HOLESTARTBLOCK);
4291 ASSERT(mval[i].br_state == XFS_EXT_NORM ||
4292 mval[i].br_state == XFS_EXT_UNWRITTEN);
4293 }
4294 }
4295 #endif /* DEBUG */
4296
4297
4298 /*
4299 * Map file blocks to filesystem blocks.
4300 * File range is given by the bno/len pair.
4301 * Adds blocks to file if a write ("flags & XFS_BMAPI_WRITE" set)
4302 * into a hole or past eof.
4303 * Only allocates blocks from a single allocation group,
4304 * to avoid locking problems.
4305 * The returned value in "firstblock" from the first call in a transaction
4306 * must be remembered and presented to subsequent calls in "firstblock".
4307 * An upper bound for the number of blocks to be allocated is supplied to
4308 * the first call in "total"; if no allocation group has that many free
4309 * blocks then the call will fail (return NULLFSBLOCK in "firstblock").
4310 */
4311 int /* error */
4312 xfs_bmapi(
4313 xfs_trans_t *tp, /* transaction pointer */
4314 xfs_inode_t *ip, /* incore inode */
4315 xfs_fileoff_t bno, /* starting file offs. mapped */
4316 xfs_filblks_t len, /* length to map in file */
4317 int flags, /* XFS_BMAPI_... */
4318 xfs_fsblock_t *firstblock, /* first allocated block
4319 controls a.g. for allocs */
4320 xfs_extlen_t total, /* total blocks needed */
4321 xfs_bmbt_irec_t *mval, /* output: map values */
4322 int *nmap, /* i/o: mval size/count */
4323 xfs_bmap_free_t *flist) /* i/o: list extents to free */
4324 {
4325 xfs_fsblock_t abno; /* allocated block number */
4326 xfs_extlen_t alen; /* allocated extent length */
4327 xfs_fileoff_t aoff; /* allocated file offset */
4328 xfs_bmalloca_t bma = { 0 }; /* args for xfs_bmap_alloc */
4329 xfs_btree_cur_t *cur; /* bmap btree cursor */
4330 xfs_fileoff_t end; /* end of mapped file region */
4331 int eof; /* we've hit the end of extents */
4332 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
4333 int error; /* error return */
4334 xfs_bmbt_irec_t got; /* current file extent record */
4335 xfs_ifork_t *ifp; /* inode fork pointer */
4336 xfs_extlen_t indlen; /* indirect blocks length */
4337 xfs_extnum_t lastx; /* last useful extent number */
4338 int logflags; /* flags for transaction logging */
4339 xfs_extlen_t minleft; /* min blocks left after allocation */
4340 xfs_extlen_t minlen; /* min allocation size */
4341 xfs_mount_t *mp; /* xfs mount structure */
4342 int n; /* current extent index */
4343 int nallocs; /* number of extents alloc'd */
4344 xfs_extnum_t nextents; /* number of extents in file */
4345 xfs_fileoff_t obno; /* old block number (offset) */
4346 xfs_bmbt_irec_t prev; /* previous file extent record */
4347 int tmp_logflags; /* temp flags holder */
4348 int whichfork; /* data or attr fork */
4349 char inhole; /* current location is hole in file */
4350 char wasdelay; /* old extent was delayed */
4351 char wr; /* this is a write request */
4352 char rt; /* this is a realtime file */
4353 #ifdef DEBUG
4354 xfs_fileoff_t orig_bno; /* original block number value */
4355 int orig_flags; /* original flags arg value */
4356 xfs_filblks_t orig_len; /* original value of len arg */
4357 xfs_bmbt_irec_t *orig_mval; /* original value of mval */
4358 int orig_nmap; /* original value of *nmap */
4359
4360 orig_bno = bno;
4361 orig_len = len;
4362 orig_flags = flags;
4363 orig_mval = mval;
4364 orig_nmap = *nmap;
4365 #endif
4366 ASSERT(*nmap >= 1);
4367 ASSERT(*nmap <= XFS_BMAP_MAX_NMAP || !(flags & XFS_BMAPI_WRITE));
4368 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4369 XFS_ATTR_FORK : XFS_DATA_FORK;
4370 mp = ip->i_mount;
4371 if (unlikely(XFS_TEST_ERROR(
4372 (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4373 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4374 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL),
4375 mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
4376 XFS_ERROR_REPORT("xfs_bmapi", XFS_ERRLEVEL_LOW, mp);
4377 return XFS_ERROR(EFSCORRUPTED);
4378 }
4379 if (XFS_FORCED_SHUTDOWN(mp))
4380 return XFS_ERROR(EIO);
4381 rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
4382 ifp = XFS_IFORK_PTR(ip, whichfork);
4383 ASSERT(ifp->if_ext_max ==
4384 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
4385 if ((wr = (flags & XFS_BMAPI_WRITE)) != 0)
4386 XFS_STATS_INC(xs_blk_mapw);
4387 else
4388 XFS_STATS_INC(xs_blk_mapr);
4389 /*
4390 * IGSTATE flag is used to combine extents which
4391 * differ only due to the state of the extents.
4392 * This technique is used from xfs_getbmap()
4393 * when the caller does not wish to see the
4394 * separation (which is the default).
4395 *
4396 * This technique is also used when writing a
4397 * buffer which has been partially written,
4398 * (usually by being flushed during a chunkread),
4399 * to ensure one write takes place. This also
4400 * prevents a change in the xfs inode extents at
4401 * this time, intentionally. This change occurs
4402 * on completion of the write operation, in
4403 * xfs_strat_comp(), where the xfs_bmapi() call
4404 * is transactioned, and the extents combined.
4405 */
4406 if ((flags & XFS_BMAPI_IGSTATE) && wr) /* if writing unwritten space */
4407 wr = 0; /* no allocations are allowed */
4408 ASSERT(wr || !(flags & XFS_BMAPI_DELAY));
4409 logflags = 0;
4410 nallocs = 0;
4411 cur = NULL;
4412 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4413 ASSERT(wr && tp);
4414 if ((error = xfs_bmap_local_to_extents(tp, ip,
4415 firstblock, total, &logflags, whichfork)))
4416 goto error0;
4417 }
4418 if (wr && *firstblock == NULLFSBLOCK) {
4419 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
4420 minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1;
4421 else
4422 minleft = 1;
4423 } else
4424 minleft = 0;
4425 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4426 (error = xfs_iread_extents(tp, ip, whichfork)))
4427 goto error0;
4428 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
4429 &prev);
4430 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4431 n = 0;
4432 end = bno + len;
4433 obno = bno;
4434 bma.ip = NULL;
4435
4436 while (bno < end && n < *nmap) {
4437 /*
4438 * Reading past eof, act as though there's a hole
4439 * up to end.
4440 */
4441 if (eof && !wr)
4442 got.br_startoff = end;
4443 inhole = eof || got.br_startoff > bno;
4444 wasdelay = wr && !inhole && !(flags & XFS_BMAPI_DELAY) &&
4445 isnullstartblock(got.br_startblock);
4446 /*
4447 * First, deal with the hole before the allocated space
4448 * that we found, if any.
4449 */
4450 if (wr && (inhole || wasdelay)) {
4451 /*
4452 * For the wasdelay case, we could also just
4453 * allocate the stuff asked for in this bmap call
4454 * but that wouldn't be as good.
4455 */
4456 if (wasdelay) {
4457 alen = (xfs_extlen_t)got.br_blockcount;
4458 aoff = got.br_startoff;
4459 if (lastx != NULLEXTNUM && lastx) {
4460 ep = xfs_iext_get_ext(ifp, lastx - 1);
4461 xfs_bmbt_get_all(ep, &prev);
4462 }
4463 } else {
4464 alen = (xfs_extlen_t)
4465 XFS_FILBLKS_MIN(len, MAXEXTLEN);
4466 if (!eof)
4467 alen = (xfs_extlen_t)
4468 XFS_FILBLKS_MIN(alen,
4469 got.br_startoff - bno);
4470 aoff = bno;
4471 }
4472 minlen = (flags & XFS_BMAPI_CONTIG) ? alen : 1;
4473 if (flags & XFS_BMAPI_DELAY) {
4474 xfs_extlen_t extsz;
4475
4476 /* Figure out the extent size, adjust alen */
4477 extsz = xfs_get_extsz_hint(ip);
4478 if (extsz) {
4479 /*
4480 * make sure we don't exceed a single
4481 * extent length when we align the
4482 * extent by reducing length we are
4483 * going to allocate by the maximum
4484 * amount extent size aligment may
4485 * require.
4486 */
4487 alen = XFS_FILBLKS_MIN(len,
4488 MAXEXTLEN - (2 * extsz - 1));
4489 error = xfs_bmap_extsize_align(mp,
4490 &got, &prev, extsz,
4491 rt, eof,
4492 flags&XFS_BMAPI_DELAY,
4493 flags&XFS_BMAPI_CONVERT,
4494 &aoff, &alen);
4495 ASSERT(!error);
4496 }
4497
4498 if (rt)
4499 extsz = alen / mp->m_sb.sb_rextsize;
4500
4501 /*
4502 * Make a transaction-less quota reservation for
4503 * delayed allocation blocks. This number gets
4504 * adjusted later. We return if we haven't
4505 * allocated blocks already inside this loop.
4506 */
4507 error = xfs_trans_reserve_quota_nblks(
4508 NULL, ip, (long)alen, 0,
4509 rt ? XFS_QMOPT_RES_RTBLKS :
4510 XFS_QMOPT_RES_REGBLKS);
4511 if (error) {
4512 if (n == 0) {
4513 *nmap = 0;
4514 ASSERT(cur == NULL);
4515 return error;
4516 }
4517 break;
4518 }
4519
4520 /*
4521 * Split changing sb for alen and indlen since
4522 * they could be coming from different places.
4523 */
4524 indlen = (xfs_extlen_t)
4525 xfs_bmap_worst_indlen(ip, alen);
4526 ASSERT(indlen > 0);
4527
4528 if (rt) {
4529 error = xfs_mod_incore_sb(mp,
4530 XFS_SBS_FREXTENTS,
4531 -((int64_t)extsz), 0);
4532 } else {
4533 error = xfs_icsb_modify_counters(mp,
4534 XFS_SBS_FDBLOCKS,
4535 -((int64_t)alen), 0);
4536 }
4537 if (!error) {
4538 error = xfs_icsb_modify_counters(mp,
4539 XFS_SBS_FDBLOCKS,
4540 -((int64_t)indlen), 0);
4541 if (error && rt)
4542 xfs_mod_incore_sb(mp,
4543 XFS_SBS_FREXTENTS,
4544 (int64_t)extsz, 0);
4545 else if (error)
4546 xfs_icsb_modify_counters(mp,
4547 XFS_SBS_FDBLOCKS,
4548 (int64_t)alen, 0);
4549 }
4550
4551 if (error) {
4552 if (XFS_IS_QUOTA_ON(mp))
4553 /* unreserve the blocks now */
4554 (void)
4555 xfs_trans_unreserve_quota_nblks(
4556 NULL, ip,
4557 (long)alen, 0, rt ?
4558 XFS_QMOPT_RES_RTBLKS :
4559 XFS_QMOPT_RES_REGBLKS);
4560 break;
4561 }
4562
4563 ip->i_delayed_blks += alen;
4564 abno = nullstartblock(indlen);
4565 } else {
4566 /*
4567 * If first time, allocate and fill in
4568 * once-only bma fields.
4569 */
4570 if (bma.ip == NULL) {
4571 bma.tp = tp;
4572 bma.ip = ip;
4573 bma.prevp = &prev;
4574 bma.gotp = &got;
4575 bma.total = total;
4576 bma.userdata = 0;
4577 }
4578 /* Indicate if this is the first user data
4579 * in the file, or just any user data.
4580 */
4581 if (!(flags & XFS_BMAPI_METADATA)) {
4582 bma.userdata = (aoff == 0) ?
4583 XFS_ALLOC_INITIAL_USER_DATA :
4584 XFS_ALLOC_USERDATA;
4585 }
4586 /*
4587 * Fill in changeable bma fields.
4588 */
4589 bma.eof = eof;
4590 bma.firstblock = *firstblock;
4591 bma.alen = alen;
4592 bma.off = aoff;
4593 bma.conv = !!(flags & XFS_BMAPI_CONVERT);
4594 bma.wasdel = wasdelay;
4595 bma.minlen = minlen;
4596 bma.low = flist->xbf_low;
4597 bma.minleft = minleft;
4598 /*
4599 * Only want to do the alignment at the
4600 * eof if it is userdata and allocation length
4601 * is larger than a stripe unit.
4602 */
4603 if (mp->m_dalign && alen >= mp->m_dalign &&
4604 (!(flags & XFS_BMAPI_METADATA)) &&
4605 (whichfork == XFS_DATA_FORK)) {
4606 if ((error = xfs_bmap_isaeof(ip, aoff,
4607 whichfork, &bma.aeof)))
4608 goto error0;
4609 } else
4610 bma.aeof = 0;
4611 /*
4612 * Call allocator.
4613 */
4614 if ((error = xfs_bmap_alloc(&bma)))
4615 goto error0;
4616 /*
4617 * Copy out result fields.
4618 */
4619 abno = bma.rval;
4620 if ((flist->xbf_low = bma.low))
4621 minleft = 0;
4622 alen = bma.alen;
4623 aoff = bma.off;
4624 ASSERT(*firstblock == NULLFSBLOCK ||
4625 XFS_FSB_TO_AGNO(mp, *firstblock) ==
4626 XFS_FSB_TO_AGNO(mp, bma.firstblock) ||
4627 (flist->xbf_low &&
4628 XFS_FSB_TO_AGNO(mp, *firstblock) <
4629 XFS_FSB_TO_AGNO(mp, bma.firstblock)));
4630 *firstblock = bma.firstblock;
4631 if (cur)
4632 cur->bc_private.b.firstblock =
4633 *firstblock;
4634 if (abno == NULLFSBLOCK)
4635 break;
4636 if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
4637 cur = xfs_bmbt_init_cursor(mp, tp,
4638 ip, whichfork);
4639 cur->bc_private.b.firstblock =
4640 *firstblock;
4641 cur->bc_private.b.flist = flist;
4642 }
4643 /*
4644 * Bump the number of extents we've allocated
4645 * in this call.
4646 */
4647 nallocs++;
4648 }
4649 if (cur)
4650 cur->bc_private.b.flags =
4651 wasdelay ? XFS_BTCUR_BPRV_WASDEL : 0;
4652 got.br_startoff = aoff;
4653 got.br_startblock = abno;
4654 got.br_blockcount = alen;
4655 got.br_state = XFS_EXT_NORM; /* assume normal */
4656 /*
4657 * Determine state of extent, and the filesystem.
4658 * A wasdelay extent has been initialized, so
4659 * shouldn't be flagged as unwritten.
4660 */
4661 if (wr && xfs_sb_version_hasextflgbit(&mp->m_sb)) {
4662 if (!wasdelay && (flags & XFS_BMAPI_PREALLOC))
4663 got.br_state = XFS_EXT_UNWRITTEN;
4664 }
4665 error = xfs_bmap_add_extent(ip, &lastx, &cur, &got,
4666 firstblock, flist, &tmp_logflags,
4667 whichfork);
4668 logflags |= tmp_logflags;
4669 if (error)
4670 goto error0;
4671 ep = xfs_iext_get_ext(ifp, lastx);
4672 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4673 xfs_bmbt_get_all(ep, &got);
4674 ASSERT(got.br_startoff <= aoff);
4675 ASSERT(got.br_startoff + got.br_blockcount >=
4676 aoff + alen);
4677 #ifdef DEBUG
4678 if (flags & XFS_BMAPI_DELAY) {
4679 ASSERT(isnullstartblock(got.br_startblock));
4680 ASSERT(startblockval(got.br_startblock) > 0);
4681 }
4682 ASSERT(got.br_state == XFS_EXT_NORM ||
4683 got.br_state == XFS_EXT_UNWRITTEN);
4684 #endif
4685 /*
4686 * Fall down into the found allocated space case.
4687 */
4688 } else if (inhole) {
4689 /*
4690 * Reading in a hole.
4691 */
4692 mval->br_startoff = bno;
4693 mval->br_startblock = HOLESTARTBLOCK;
4694 mval->br_blockcount =
4695 XFS_FILBLKS_MIN(len, got.br_startoff - bno);
4696 mval->br_state = XFS_EXT_NORM;
4697 bno += mval->br_blockcount;
4698 len -= mval->br_blockcount;
4699 mval++;
4700 n++;
4701 continue;
4702 }
4703 /*
4704 * Then deal with the allocated space we found.
4705 */
4706 ASSERT(ep != NULL);
4707 if (!(flags & XFS_BMAPI_ENTIRE) &&
4708 (got.br_startoff + got.br_blockcount > obno)) {
4709 if (obno > bno)
4710 bno = obno;
4711 ASSERT((bno >= obno) || (n == 0));
4712 ASSERT(bno < end);
4713 mval->br_startoff = bno;
4714 if (isnullstartblock(got.br_startblock)) {
4715 ASSERT(!wr || (flags & XFS_BMAPI_DELAY));
4716 mval->br_startblock = DELAYSTARTBLOCK;
4717 } else
4718 mval->br_startblock =
4719 got.br_startblock +
4720 (bno - got.br_startoff);
4721 /*
4722 * Return the minimum of what we got and what we
4723 * asked for for the length. We can use the len
4724 * variable here because it is modified below
4725 * and we could have been there before coming
4726 * here if the first part of the allocation
4727 * didn't overlap what was asked for.
4728 */
4729 mval->br_blockcount =
4730 XFS_FILBLKS_MIN(end - bno, got.br_blockcount -
4731 (bno - got.br_startoff));
4732 mval->br_state = got.br_state;
4733 ASSERT(mval->br_blockcount <= len);
4734 } else {
4735 *mval = got;
4736 if (isnullstartblock(mval->br_startblock)) {
4737 ASSERT(!wr || (flags & XFS_BMAPI_DELAY));
4738 mval->br_startblock = DELAYSTARTBLOCK;
4739 }
4740 }
4741
4742 /*
4743 * Check if writing previously allocated but
4744 * unwritten extents.
4745 */
4746 if (wr &&
4747 ((mval->br_state == XFS_EXT_UNWRITTEN &&
4748 ((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_DELAY)) == 0)) ||
4749 (mval->br_state == XFS_EXT_NORM &&
4750 ((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_CONVERT)) ==
4751 (XFS_BMAPI_PREALLOC|XFS_BMAPI_CONVERT))))) {
4752 /*
4753 * Modify (by adding) the state flag, if writing.
4754 */
4755 ASSERT(mval->br_blockcount <= len);
4756 if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
4757 cur = xfs_bmbt_init_cursor(mp,
4758 tp, ip, whichfork);
4759 cur->bc_private.b.firstblock =
4760 *firstblock;
4761 cur->bc_private.b.flist = flist;
4762 }
4763 mval->br_state = (mval->br_state == XFS_EXT_UNWRITTEN)
4764 ? XFS_EXT_NORM
4765 : XFS_EXT_UNWRITTEN;
4766 error = xfs_bmap_add_extent(ip, &lastx, &cur, mval,
4767 firstblock, flist, &tmp_logflags,
4768 whichfork);
4769 logflags |= tmp_logflags;
4770 if (error)
4771 goto error0;
4772 ep = xfs_iext_get_ext(ifp, lastx);
4773 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4774 xfs_bmbt_get_all(ep, &got);
4775 /*
4776 * We may have combined previously unwritten
4777 * space with written space, so generate
4778 * another request.
4779 */
4780 if (mval->br_blockcount < len)
4781 continue;
4782 }
4783
4784 ASSERT((flags & XFS_BMAPI_ENTIRE) ||
4785 ((mval->br_startoff + mval->br_blockcount) <= end));
4786 ASSERT((flags & XFS_BMAPI_ENTIRE) ||
4787 (mval->br_blockcount <= len) ||
4788 (mval->br_startoff < obno));
4789 bno = mval->br_startoff + mval->br_blockcount;
4790 len = end - bno;
4791 if (n > 0 && mval->br_startoff == mval[-1].br_startoff) {
4792 ASSERT(mval->br_startblock == mval[-1].br_startblock);
4793 ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
4794 ASSERT(mval->br_state == mval[-1].br_state);
4795 mval[-1].br_blockcount = mval->br_blockcount;
4796 mval[-1].br_state = mval->br_state;
4797 } else if (n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
4798 mval[-1].br_startblock != DELAYSTARTBLOCK &&
4799 mval[-1].br_startblock != HOLESTARTBLOCK &&
4800 mval->br_startblock ==
4801 mval[-1].br_startblock + mval[-1].br_blockcount &&
4802 ((flags & XFS_BMAPI_IGSTATE) ||
4803 mval[-1].br_state == mval->br_state)) {
4804 ASSERT(mval->br_startoff ==
4805 mval[-1].br_startoff + mval[-1].br_blockcount);
4806 mval[-1].br_blockcount += mval->br_blockcount;
4807 } else if (n > 0 &&
4808 mval->br_startblock == DELAYSTARTBLOCK &&
4809 mval[-1].br_startblock == DELAYSTARTBLOCK &&
4810 mval->br_startoff ==
4811 mval[-1].br_startoff + mval[-1].br_blockcount) {
4812 mval[-1].br_blockcount += mval->br_blockcount;
4813 mval[-1].br_state = mval->br_state;
4814 } else if (!((n == 0) &&
4815 ((mval->br_startoff + mval->br_blockcount) <=
4816 obno))) {
4817 mval++;
4818 n++;
4819 }
4820 /*
4821 * If we're done, stop now. Stop when we've allocated
4822 * XFS_BMAP_MAX_NMAP extents no matter what. Otherwise
4823 * the transaction may get too big.
4824 */
4825 if (bno >= end || n >= *nmap || nallocs >= *nmap)
4826 break;
4827 /*
4828 * Else go on to the next record.
4829 */
4830 prev = got;
4831 if (++lastx < nextents) {
4832 ep = xfs_iext_get_ext(ifp, lastx);
4833 xfs_bmbt_get_all(ep, &got);
4834 } else {
4835 eof = 1;
4836 }
4837 }
4838 *nmap = n;
4839 /*
4840 * Transform from btree to extents, give it cur.
4841 */
4842 if (tp && XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
4843 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
4844 ASSERT(wr && cur);
4845 error = xfs_bmap_btree_to_extents(tp, ip, cur,
4846 &tmp_logflags, whichfork);
4847 logflags |= tmp_logflags;
4848 if (error)
4849 goto error0;
4850 }
4851 ASSERT(ifp->if_ext_max ==
4852 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
4853 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
4854 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max);
4855 error = 0;
4856 error0:
4857 /*
4858 * Log everything. Do this after conversion, there's no point in
4859 * logging the extent records if we've converted to btree format.
4860 */
4861 if ((logflags & xfs_ilog_fext(whichfork)) &&
4862 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
4863 logflags &= ~xfs_ilog_fext(whichfork);
4864 else if ((logflags & xfs_ilog_fbroot(whichfork)) &&
4865 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
4866 logflags &= ~xfs_ilog_fbroot(whichfork);
4867 /*
4868 * Log whatever the flags say, even if error. Otherwise we might miss
4869 * detecting a case where the data is changed, there's an error,
4870 * and it's not logged so we don't shutdown when we should.
4871 */
4872 if (logflags) {
4873 ASSERT(tp && wr);
4874 xfs_trans_log_inode(tp, ip, logflags);
4875 }
4876 if (cur) {
4877 if (!error) {
4878 ASSERT(*firstblock == NULLFSBLOCK ||
4879 XFS_FSB_TO_AGNO(mp, *firstblock) ==
4880 XFS_FSB_TO_AGNO(mp,
4881 cur->bc_private.b.firstblock) ||
4882 (flist->xbf_low &&
4883 XFS_FSB_TO_AGNO(mp, *firstblock) <
4884 XFS_FSB_TO_AGNO(mp,
4885 cur->bc_private.b.firstblock)));
4886 *firstblock = cur->bc_private.b.firstblock;
4887 }
4888 xfs_btree_del_cursor(cur,
4889 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
4890 }
4891 if (!error)
4892 xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
4893 orig_nmap, *nmap);
4894 return error;
4895 }
4896
4897 /*
4898 * Map file blocks to filesystem blocks, simple version.
4899 * One block (extent) only, read-only.
4900 * For flags, only the XFS_BMAPI_ATTRFORK flag is examined.
4901 * For the other flag values, the effect is as if XFS_BMAPI_METADATA
4902 * was set and all the others were clear.
4903 */
4904 int /* error */
4905 xfs_bmapi_single(
4906 xfs_trans_t *tp, /* transaction pointer */
4907 xfs_inode_t *ip, /* incore inode */
4908 int whichfork, /* data or attr fork */
4909 xfs_fsblock_t *fsb, /* output: mapped block */
4910 xfs_fileoff_t bno) /* starting file offs. mapped */
4911 {
4912 int eof; /* we've hit the end of extents */
4913 int error; /* error return */
4914 xfs_bmbt_irec_t got; /* current file extent record */
4915 xfs_ifork_t *ifp; /* inode fork pointer */
4916 xfs_extnum_t lastx; /* last useful extent number */
4917 xfs_bmbt_irec_t prev; /* previous file extent record */
4918
4919 ifp = XFS_IFORK_PTR(ip, whichfork);
4920 if (unlikely(
4921 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4922 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)) {
4923 XFS_ERROR_REPORT("xfs_bmapi_single", XFS_ERRLEVEL_LOW,
4924 ip->i_mount);
4925 return XFS_ERROR(EFSCORRUPTED);
4926 }
4927 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
4928 return XFS_ERROR(EIO);
4929 XFS_STATS_INC(xs_blk_mapr);
4930 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4931 (error = xfs_iread_extents(tp, ip, whichfork)))
4932 return error;
4933 (void)xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
4934 &prev);
4935 /*
4936 * Reading past eof, act as though there's a hole
4937 * up to end.
4938 */
4939 if (eof || got.br_startoff > bno) {
4940 *fsb = NULLFSBLOCK;
4941 return 0;
4942 }
4943 ASSERT(!isnullstartblock(got.br_startblock));
4944 ASSERT(bno < got.br_startoff + got.br_blockcount);
4945 *fsb = got.br_startblock + (bno - got.br_startoff);
4946 return 0;
4947 }
4948
4949 /*
4950 * Unmap (remove) blocks from a file.
4951 * If nexts is nonzero then the number of extents to remove is limited to
4952 * that value. If not all extents in the block range can be removed then
4953 * *done is set.
4954 */
4955 int /* error */
4956 xfs_bunmapi(
4957 xfs_trans_t *tp, /* transaction pointer */
4958 struct xfs_inode *ip, /* incore inode */
4959 xfs_fileoff_t bno, /* starting offset to unmap */
4960 xfs_filblks_t len, /* length to unmap in file */
4961 int flags, /* misc flags */
4962 xfs_extnum_t nexts, /* number of extents max */
4963 xfs_fsblock_t *firstblock, /* first allocated block
4964 controls a.g. for allocs */
4965 xfs_bmap_free_t *flist, /* i/o: list extents to free */
4966 int *done) /* set if not done yet */
4967 {
4968 xfs_btree_cur_t *cur; /* bmap btree cursor */
4969 xfs_bmbt_irec_t del; /* extent being deleted */
4970 int eof; /* is deleting at eof */
4971 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
4972 int error; /* error return value */
4973 xfs_extnum_t extno; /* extent number in list */
4974 xfs_bmbt_irec_t got; /* current extent record */
4975 xfs_ifork_t *ifp; /* inode fork pointer */
4976 int isrt; /* freeing in rt area */
4977 xfs_extnum_t lastx; /* last extent index used */
4978 int logflags; /* transaction logging flags */
4979 xfs_extlen_t mod; /* rt extent offset */
4980 xfs_mount_t *mp; /* mount structure */
4981 xfs_extnum_t nextents; /* number of file extents */
4982 xfs_bmbt_irec_t prev; /* previous extent record */
4983 xfs_fileoff_t start; /* first file offset deleted */
4984 int tmp_logflags; /* partial logging flags */
4985 int wasdel; /* was a delayed alloc extent */
4986 int whichfork; /* data or attribute fork */
4987 xfs_fsblock_t sum;
4988
4989 trace_xfs_bunmap(ip, bno, len, flags, _RET_IP_);
4990
4991 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4992 XFS_ATTR_FORK : XFS_DATA_FORK;
4993 ifp = XFS_IFORK_PTR(ip, whichfork);
4994 if (unlikely(
4995 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4996 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
4997 XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW,
4998 ip->i_mount);
4999 return XFS_ERROR(EFSCORRUPTED);
5000 }
5001 mp = ip->i_mount;
5002 if (XFS_FORCED_SHUTDOWN(mp))
5003 return XFS_ERROR(EIO);
5004
5005 ASSERT(len > 0);
5006 ASSERT(nexts >= 0);
5007 ASSERT(ifp->if_ext_max ==
5008 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5009 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5010 (error = xfs_iread_extents(tp, ip, whichfork)))
5011 return error;
5012 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5013 if (nextents == 0) {
5014 *done = 1;
5015 return 0;
5016 }
5017 XFS_STATS_INC(xs_blk_unmap);
5018 isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
5019 start = bno;
5020 bno = start + len - 1;
5021 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
5022 &prev);
5023
5024 /*
5025 * Check to see if the given block number is past the end of the
5026 * file, back up to the last block if so...
5027 */
5028 if (eof) {
5029 ep = xfs_iext_get_ext(ifp, --lastx);
5030 xfs_bmbt_get_all(ep, &got);
5031 bno = got.br_startoff + got.br_blockcount - 1;
5032 }
5033 logflags = 0;
5034 if (ifp->if_flags & XFS_IFBROOT) {
5035 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
5036 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
5037 cur->bc_private.b.firstblock = *firstblock;
5038 cur->bc_private.b.flist = flist;
5039 cur->bc_private.b.flags = 0;
5040 } else
5041 cur = NULL;
5042 extno = 0;
5043 while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
5044 (nexts == 0 || extno < nexts)) {
5045 /*
5046 * Is the found extent after a hole in which bno lives?
5047 * Just back up to the previous extent, if so.
5048 */
5049 if (got.br_startoff > bno) {
5050 if (--lastx < 0)
5051 break;
5052 ep = xfs_iext_get_ext(ifp, lastx);
5053 xfs_bmbt_get_all(ep, &got);
5054 }
5055 /*
5056 * Is the last block of this extent before the range
5057 * we're supposed to delete? If so, we're done.
5058 */
5059 bno = XFS_FILEOFF_MIN(bno,
5060 got.br_startoff + got.br_blockcount - 1);
5061 if (bno < start)
5062 break;
5063 /*
5064 * Then deal with the (possibly delayed) allocated space
5065 * we found.
5066 */
5067 ASSERT(ep != NULL);
5068 del = got;
5069 wasdel = isnullstartblock(del.br_startblock);
5070 if (got.br_startoff < start) {
5071 del.br_startoff = start;
5072 del.br_blockcount -= start - got.br_startoff;
5073 if (!wasdel)
5074 del.br_startblock += start - got.br_startoff;
5075 }
5076 if (del.br_startoff + del.br_blockcount > bno + 1)
5077 del.br_blockcount = bno + 1 - del.br_startoff;
5078 sum = del.br_startblock + del.br_blockcount;
5079 if (isrt &&
5080 (mod = do_mod(sum, mp->m_sb.sb_rextsize))) {
5081 /*
5082 * Realtime extent not lined up at the end.
5083 * The extent could have been split into written
5084 * and unwritten pieces, or we could just be
5085 * unmapping part of it. But we can't really
5086 * get rid of part of a realtime extent.
5087 */
5088 if (del.br_state == XFS_EXT_UNWRITTEN ||
5089 !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5090 /*
5091 * This piece is unwritten, or we're not
5092 * using unwritten extents. Skip over it.
5093 */
5094 ASSERT(bno >= mod);
5095 bno -= mod > del.br_blockcount ?
5096 del.br_blockcount : mod;
5097 if (bno < got.br_startoff) {
5098 if (--lastx >= 0)
5099 xfs_bmbt_get_all(xfs_iext_get_ext(
5100 ifp, lastx), &got);
5101 }
5102 continue;
5103 }
5104 /*
5105 * It's written, turn it unwritten.
5106 * This is better than zeroing it.
5107 */
5108 ASSERT(del.br_state == XFS_EXT_NORM);
5109 ASSERT(xfs_trans_get_block_res(tp) > 0);
5110 /*
5111 * If this spans a realtime extent boundary,
5112 * chop it back to the start of the one we end at.
5113 */
5114 if (del.br_blockcount > mod) {
5115 del.br_startoff += del.br_blockcount - mod;
5116 del.br_startblock += del.br_blockcount - mod;
5117 del.br_blockcount = mod;
5118 }
5119 del.br_state = XFS_EXT_UNWRITTEN;
5120 error = xfs_bmap_add_extent(ip, &lastx, &cur, &del,
5121 firstblock, flist, &logflags,
5122 XFS_DATA_FORK);
5123 if (error)
5124 goto error0;
5125 goto nodelete;
5126 }
5127 if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) {
5128 /*
5129 * Realtime extent is lined up at the end but not
5130 * at the front. We'll get rid of full extents if
5131 * we can.
5132 */
5133 mod = mp->m_sb.sb_rextsize - mod;
5134 if (del.br_blockcount > mod) {
5135 del.br_blockcount -= mod;
5136 del.br_startoff += mod;
5137 del.br_startblock += mod;
5138 } else if ((del.br_startoff == start &&
5139 (del.br_state == XFS_EXT_UNWRITTEN ||
5140 xfs_trans_get_block_res(tp) == 0)) ||
5141 !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5142 /*
5143 * Can't make it unwritten. There isn't
5144 * a full extent here so just skip it.
5145 */
5146 ASSERT(bno >= del.br_blockcount);
5147 bno -= del.br_blockcount;
5148 if (got.br_startoff > bno) {
5149 if (--lastx >= 0) {
5150 ep = xfs_iext_get_ext(ifp,
5151 lastx);
5152 xfs_bmbt_get_all(ep, &got);
5153 }
5154 }
5155 continue;
5156 } else if (del.br_state == XFS_EXT_UNWRITTEN) {
5157 /*
5158 * This one is already unwritten.
5159 * It must have a written left neighbor.
5160 * Unwrite the killed part of that one and
5161 * try again.
5162 */
5163 ASSERT(lastx > 0);
5164 xfs_bmbt_get_all(xfs_iext_get_ext(ifp,
5165 lastx - 1), &prev);
5166 ASSERT(prev.br_state == XFS_EXT_NORM);
5167 ASSERT(!isnullstartblock(prev.br_startblock));
5168 ASSERT(del.br_startblock ==
5169 prev.br_startblock + prev.br_blockcount);
5170 if (prev.br_startoff < start) {
5171 mod = start - prev.br_startoff;
5172 prev.br_blockcount -= mod;
5173 prev.br_startblock += mod;
5174 prev.br_startoff = start;
5175 }
5176 prev.br_state = XFS_EXT_UNWRITTEN;
5177 lastx--;
5178 error = xfs_bmap_add_extent(ip, &lastx, &cur,
5179 &prev, firstblock, flist, &logflags,
5180 XFS_DATA_FORK);
5181 if (error)
5182 goto error0;
5183 goto nodelete;
5184 } else {
5185 ASSERT(del.br_state == XFS_EXT_NORM);
5186 del.br_state = XFS_EXT_UNWRITTEN;
5187 error = xfs_bmap_add_extent(ip, &lastx, &cur,
5188 &del, firstblock, flist, &logflags,
5189 XFS_DATA_FORK);
5190 if (error)
5191 goto error0;
5192 goto nodelete;
5193 }
5194 }
5195 if (wasdel) {
5196 ASSERT(startblockval(del.br_startblock) > 0);
5197 /* Update realtime/data freespace, unreserve quota */
5198 if (isrt) {
5199 xfs_filblks_t rtexts;
5200
5201 rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
5202 do_div(rtexts, mp->m_sb.sb_rextsize);
5203 xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
5204 (int64_t)rtexts, 0);
5205 (void)xfs_trans_reserve_quota_nblks(NULL,
5206 ip, -((long)del.br_blockcount), 0,
5207 XFS_QMOPT_RES_RTBLKS);
5208 } else {
5209 xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
5210 (int64_t)del.br_blockcount, 0);
5211 (void)xfs_trans_reserve_quota_nblks(NULL,
5212 ip, -((long)del.br_blockcount), 0,
5213 XFS_QMOPT_RES_REGBLKS);
5214 }
5215 ip->i_delayed_blks -= del.br_blockcount;
5216 if (cur)
5217 cur->bc_private.b.flags |=
5218 XFS_BTCUR_BPRV_WASDEL;
5219 } else if (cur)
5220 cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
5221 /*
5222 * If it's the case where the directory code is running
5223 * with no block reservation, and the deleted block is in
5224 * the middle of its extent, and the resulting insert
5225 * of an extent would cause transformation to btree format,
5226 * then reject it. The calling code will then swap
5227 * blocks around instead.
5228 * We have to do this now, rather than waiting for the
5229 * conversion to btree format, since the transaction
5230 * will be dirty.
5231 */
5232 if (!wasdel && xfs_trans_get_block_res(tp) == 0 &&
5233 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5234 XFS_IFORK_NEXTENTS(ip, whichfork) >= ifp->if_ext_max &&
5235 del.br_startoff > got.br_startoff &&
5236 del.br_startoff + del.br_blockcount <
5237 got.br_startoff + got.br_blockcount) {
5238 error = XFS_ERROR(ENOSPC);
5239 goto error0;
5240 }
5241 error = xfs_bmap_del_extent(ip, tp, &lastx, flist, cur, &del,
5242 &tmp_logflags, whichfork);
5243 logflags |= tmp_logflags;
5244 if (error)
5245 goto error0;
5246 bno = del.br_startoff - 1;
5247 nodelete:
5248 /*
5249 * If not done go on to the next (previous) record.
5250 */
5251 if (bno != (xfs_fileoff_t)-1 && bno >= start) {
5252 if (lastx >= 0) {
5253 ep = xfs_iext_get_ext(ifp, lastx);
5254 if (xfs_bmbt_get_startoff(ep) > bno) {
5255 if (--lastx >= 0)
5256 ep = xfs_iext_get_ext(ifp,
5257 lastx);
5258 }
5259 xfs_bmbt_get_all(ep, &got);
5260 }
5261 extno++;
5262 }
5263 }
5264 *done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0;
5265 ASSERT(ifp->if_ext_max ==
5266 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5267 /*
5268 * Convert to a btree if necessary.
5269 */
5270 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5271 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
5272 ASSERT(cur == NULL);
5273 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist,
5274 &cur, 0, &tmp_logflags, whichfork);
5275 logflags |= tmp_logflags;
5276 if (error)
5277 goto error0;
5278 }
5279 /*
5280 * transform from btree to extents, give it cur
5281 */
5282 else if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
5283 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
5284 ASSERT(cur != NULL);
5285 error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
5286 whichfork);
5287 logflags |= tmp_logflags;
5288 if (error)
5289 goto error0;
5290 }
5291 /*
5292 * transform from extents to local?
5293 */
5294 ASSERT(ifp->if_ext_max ==
5295 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5296 error = 0;
5297 error0:
5298 /*
5299 * Log everything. Do this after conversion, there's no point in
5300 * logging the extent records if we've converted to btree format.
5301 */
5302 if ((logflags & xfs_ilog_fext(whichfork)) &&
5303 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5304 logflags &= ~xfs_ilog_fext(whichfork);
5305 else if ((logflags & xfs_ilog_fbroot(whichfork)) &&
5306 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5307 logflags &= ~xfs_ilog_fbroot(whichfork);
5308 /*
5309 * Log inode even in the error case, if the transaction
5310 * is dirty we'll need to shut down the filesystem.
5311 */
5312 if (logflags)
5313 xfs_trans_log_inode(tp, ip, logflags);
5314 if (cur) {
5315 if (!error) {
5316 *firstblock = cur->bc_private.b.firstblock;
5317 cur->bc_private.b.allocated = 0;
5318 }
5319 xfs_btree_del_cursor(cur,
5320 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5321 }
5322 return error;
5323 }
5324
5325 /*
5326 * returns 1 for success, 0 if we failed to map the extent.
5327 */
5328 STATIC int
5329 xfs_getbmapx_fix_eof_hole(
5330 xfs_inode_t *ip, /* xfs incore inode pointer */
5331 struct getbmapx *out, /* output structure */
5332 int prealloced, /* this is a file with
5333 * preallocated data space */
5334 __int64_t end, /* last block requested */
5335 xfs_fsblock_t startblock)
5336 {
5337 __int64_t fixlen;
5338 xfs_mount_t *mp; /* file system mount point */
5339 xfs_ifork_t *ifp; /* inode fork pointer */
5340 xfs_extnum_t lastx; /* last extent pointer */
5341 xfs_fileoff_t fileblock;
5342
5343 if (startblock == HOLESTARTBLOCK) {
5344 mp = ip->i_mount;
5345 out->bmv_block = -1;
5346 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, ip->i_size));
5347 fixlen -= out->bmv_offset;
5348 if (prealloced && out->bmv_offset + out->bmv_length == end) {
5349 /* Came to hole at EOF. Trim it. */
5350 if (fixlen <= 0)
5351 return 0;
5352 out->bmv_length = fixlen;
5353 }
5354 } else {
5355 if (startblock == DELAYSTARTBLOCK)
5356 out->bmv_block = -2;
5357 else
5358 out->bmv_block = xfs_fsb_to_db(ip, startblock);
5359 fileblock = XFS_BB_TO_FSB(ip->i_mount, out->bmv_offset);
5360 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
5361 if (xfs_iext_bno_to_ext(ifp, fileblock, &lastx) &&
5362 (lastx == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))-1))
5363 out->bmv_oflags |= BMV_OF_LAST;
5364 }
5365
5366 return 1;
5367 }
5368
5369 /*
5370 * Get inode's extents as described in bmv, and format for output.
5371 * Calls formatter to fill the user's buffer until all extents
5372 * are mapped, until the passed-in bmv->bmv_count slots have
5373 * been filled, or until the formatter short-circuits the loop,
5374 * if it is tracking filled-in extents on its own.
5375 */
5376 int /* error code */
5377 xfs_getbmap(
5378 xfs_inode_t *ip,
5379 struct getbmapx *bmv, /* user bmap structure */
5380 xfs_bmap_format_t formatter, /* format to user */
5381 void *arg) /* formatter arg */
5382 {
5383 __int64_t bmvend; /* last block requested */
5384 int error = 0; /* return value */
5385 __int64_t fixlen; /* length for -1 case */
5386 int i; /* extent number */
5387 int lock; /* lock state */
5388 xfs_bmbt_irec_t *map; /* buffer for user's data */
5389 xfs_mount_t *mp; /* file system mount point */
5390 int nex; /* # of user extents can do */
5391 int nexleft; /* # of user extents left */
5392 int subnex; /* # of bmapi's can do */
5393 int nmap; /* number of map entries */
5394 struct getbmapx *out; /* output structure */
5395 int whichfork; /* data or attr fork */
5396 int prealloced; /* this is a file with
5397 * preallocated data space */
5398 int iflags; /* interface flags */
5399 int bmapi_flags; /* flags for xfs_bmapi */
5400 int cur_ext = 0;
5401
5402 mp = ip->i_mount;
5403 iflags = bmv->bmv_iflags;
5404 whichfork = iflags & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
5405
5406 if (whichfork == XFS_ATTR_FORK) {
5407 if (XFS_IFORK_Q(ip)) {
5408 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS &&
5409 ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE &&
5410 ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)
5411 return XFS_ERROR(EINVAL);
5412 } else if (unlikely(
5413 ip->i_d.di_aformat != 0 &&
5414 ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) {
5415 XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW,
5416 ip->i_mount);
5417 return XFS_ERROR(EFSCORRUPTED);
5418 }
5419
5420 prealloced = 0;
5421 fixlen = 1LL << 32;
5422 } else {
5423 if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
5424 ip->i_d.di_format != XFS_DINODE_FMT_BTREE &&
5425 ip->i_d.di_format != XFS_DINODE_FMT_LOCAL)
5426 return XFS_ERROR(EINVAL);
5427
5428 if (xfs_get_extsz_hint(ip) ||
5429 ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){
5430 prealloced = 1;
5431 fixlen = XFS_MAXIOFFSET(mp);
5432 } else {
5433 prealloced = 0;
5434 fixlen = ip->i_size;
5435 }
5436 }
5437
5438 if (bmv->bmv_length == -1) {
5439 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen));
5440 bmv->bmv_length =
5441 max_t(__int64_t, fixlen - bmv->bmv_offset, 0);
5442 } else if (bmv->bmv_length == 0) {
5443 bmv->bmv_entries = 0;
5444 return 0;
5445 } else if (bmv->bmv_length < 0) {
5446 return XFS_ERROR(EINVAL);
5447 }
5448
5449 nex = bmv->bmv_count - 1;
5450 if (nex <= 0)
5451 return XFS_ERROR(EINVAL);
5452 bmvend = bmv->bmv_offset + bmv->bmv_length;
5453
5454
5455 if (bmv->bmv_count > ULONG_MAX / sizeof(struct getbmapx))
5456 return XFS_ERROR(ENOMEM);
5457 out = kmem_zalloc(bmv->bmv_count * sizeof(struct getbmapx), KM_MAYFAIL);
5458 if (!out)
5459 return XFS_ERROR(ENOMEM);
5460
5461 xfs_ilock(ip, XFS_IOLOCK_SHARED);
5462 if (whichfork == XFS_DATA_FORK && !(iflags & BMV_IF_DELALLOC)) {
5463 if (ip->i_delayed_blks || ip->i_size > ip->i_d.di_size) {
5464 error = xfs_flush_pages(ip, 0, -1, 0, FI_REMAPF);
5465 if (error)
5466 goto out_unlock_iolock;
5467 }
5468 /*
5469 * even after flushing the inode, there can still be delalloc
5470 * blocks on the inode beyond EOF due to speculative
5471 * preallocation. These are not removed until the release
5472 * function is called or the inode is inactivated. Hence we
5473 * cannot assert here that ip->i_delayed_blks == 0.
5474 */
5475 }
5476
5477 lock = xfs_ilock_map_shared(ip);
5478
5479 /*
5480 * Don't let nex be bigger than the number of extents
5481 * we can have assuming alternating holes and real extents.
5482 */
5483 if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1)
5484 nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1;
5485
5486 bmapi_flags = xfs_bmapi_aflag(whichfork);
5487 if (!(iflags & BMV_IF_PREALLOC))
5488 bmapi_flags |= XFS_BMAPI_IGSTATE;
5489
5490 /*
5491 * Allocate enough space to handle "subnex" maps at a time.
5492 */
5493 error = ENOMEM;
5494 subnex = 16;
5495 map = kmem_alloc(subnex * sizeof(*map), KM_MAYFAIL | KM_NOFS);
5496 if (!map)
5497 goto out_unlock_ilock;
5498
5499 bmv->bmv_entries = 0;
5500
5501 if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0 &&
5502 (whichfork == XFS_ATTR_FORK || !(iflags & BMV_IF_DELALLOC))) {
5503 error = 0;
5504 goto out_free_map;
5505 }
5506
5507 nexleft = nex;
5508
5509 do {
5510 nmap = (nexleft > subnex) ? subnex : nexleft;
5511 error = xfs_bmapi(NULL, ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
5512 XFS_BB_TO_FSB(mp, bmv->bmv_length),
5513 bmapi_flags, NULL, 0, map, &nmap,
5514 NULL);
5515 if (error)
5516 goto out_free_map;
5517 ASSERT(nmap <= subnex);
5518
5519 for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
5520 out[cur_ext].bmv_oflags = 0;
5521 if (map[i].br_state == XFS_EXT_UNWRITTEN)
5522 out[cur_ext].bmv_oflags |= BMV_OF_PREALLOC;
5523 else if (map[i].br_startblock == DELAYSTARTBLOCK)
5524 out[cur_ext].bmv_oflags |= BMV_OF_DELALLOC;
5525 out[cur_ext].bmv_offset =
5526 XFS_FSB_TO_BB(mp, map[i].br_startoff);
5527 out[cur_ext].bmv_length =
5528 XFS_FSB_TO_BB(mp, map[i].br_blockcount);
5529 out[cur_ext].bmv_unused1 = 0;
5530 out[cur_ext].bmv_unused2 = 0;
5531 ASSERT(((iflags & BMV_IF_DELALLOC) != 0) ||
5532 (map[i].br_startblock != DELAYSTARTBLOCK));
5533 if (map[i].br_startblock == HOLESTARTBLOCK &&
5534 whichfork == XFS_ATTR_FORK) {
5535 /* came to the end of attribute fork */
5536 out[cur_ext].bmv_oflags |= BMV_OF_LAST;
5537 goto out_free_map;
5538 }
5539
5540 if (!xfs_getbmapx_fix_eof_hole(ip, &out[cur_ext],
5541 prealloced, bmvend,
5542 map[i].br_startblock))
5543 goto out_free_map;
5544
5545 bmv->bmv_offset =
5546 out[cur_ext].bmv_offset +
5547 out[cur_ext].bmv_length;
5548 bmv->bmv_length =
5549 max_t(__int64_t, 0, bmvend - bmv->bmv_offset);
5550
5551 /*
5552 * In case we don't want to return the hole,
5553 * don't increase cur_ext so that we can reuse
5554 * it in the next loop.
5555 */
5556 if ((iflags & BMV_IF_NO_HOLES) &&
5557 map[i].br_startblock == HOLESTARTBLOCK) {
5558 memset(&out[cur_ext], 0, sizeof(out[cur_ext]));
5559 continue;
5560 }
5561
5562 nexleft--;
5563 bmv->bmv_entries++;
5564 cur_ext++;
5565 }
5566 } while (nmap && nexleft && bmv->bmv_length);
5567
5568 out_free_map:
5569 kmem_free(map);
5570 out_unlock_ilock:
5571 xfs_iunlock_map_shared(ip, lock);
5572 out_unlock_iolock:
5573 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
5574
5575 for (i = 0; i < cur_ext; i++) {
5576 int full = 0; /* user array is full */
5577
5578 /* format results & advance arg */
5579 error = formatter(&arg, &out[i], &full);
5580 if (error || full)
5581 break;
5582 }
5583
5584 kmem_free(out);
5585 return error;
5586 }
5587
5588 /*
5589 * Check the last inode extent to determine whether this allocation will result
5590 * in blocks being allocated at the end of the file. When we allocate new data
5591 * blocks at the end of the file which do not start at the previous data block,
5592 * we will try to align the new blocks at stripe unit boundaries.
5593 */
5594 STATIC int /* error */
5595 xfs_bmap_isaeof(
5596 xfs_inode_t *ip, /* incore inode pointer */
5597 xfs_fileoff_t off, /* file offset in fsblocks */
5598 int whichfork, /* data or attribute fork */
5599 char *aeof) /* return value */
5600 {
5601 int error; /* error return value */
5602 xfs_ifork_t *ifp; /* inode fork pointer */
5603 xfs_bmbt_rec_host_t *lastrec; /* extent record pointer */
5604 xfs_extnum_t nextents; /* number of file extents */
5605 xfs_bmbt_irec_t s; /* expanded extent record */
5606
5607 ASSERT(whichfork == XFS_DATA_FORK);
5608 ifp = XFS_IFORK_PTR(ip, whichfork);
5609 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5610 (error = xfs_iread_extents(NULL, ip, whichfork)))
5611 return error;
5612 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5613 if (nextents == 0) {
5614 *aeof = 1;
5615 return 0;
5616 }
5617 /*
5618 * Go to the last extent
5619 */
5620 lastrec = xfs_iext_get_ext(ifp, nextents - 1);
5621 xfs_bmbt_get_all(lastrec, &s);
5622 /*
5623 * Check we are allocating in the last extent (for delayed allocations)
5624 * or past the last extent for non-delayed allocations.
5625 */
5626 *aeof = (off >= s.br_startoff &&
5627 off < s.br_startoff + s.br_blockcount &&
5628 isnullstartblock(s.br_startblock)) ||
5629 off >= s.br_startoff + s.br_blockcount;
5630 return 0;
5631 }
5632
5633 /*
5634 * Check if the endoff is outside the last extent. If so the caller will grow
5635 * the allocation to a stripe unit boundary.
5636 */
5637 int /* error */
5638 xfs_bmap_eof(
5639 xfs_inode_t *ip, /* incore inode pointer */
5640 xfs_fileoff_t endoff, /* file offset in fsblocks */
5641 int whichfork, /* data or attribute fork */
5642 int *eof) /* result value */
5643 {
5644 xfs_fsblock_t blockcount; /* extent block count */
5645 int error; /* error return value */
5646 xfs_ifork_t *ifp; /* inode fork pointer */
5647 xfs_bmbt_rec_host_t *lastrec; /* extent record pointer */
5648 xfs_extnum_t nextents; /* number of file extents */
5649 xfs_fileoff_t startoff; /* extent starting file offset */
5650
5651 ASSERT(whichfork == XFS_DATA_FORK);
5652 ifp = XFS_IFORK_PTR(ip, whichfork);
5653 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5654 (error = xfs_iread_extents(NULL, ip, whichfork)))
5655 return error;
5656 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5657 if (nextents == 0) {
5658 *eof = 1;
5659 return 0;
5660 }
5661 /*
5662 * Go to the last extent
5663 */
5664 lastrec = xfs_iext_get_ext(ifp, nextents - 1);
5665 startoff = xfs_bmbt_get_startoff(lastrec);
5666 blockcount = xfs_bmbt_get_blockcount(lastrec);
5667 *eof = endoff >= startoff + blockcount;
5668 return 0;
5669 }
5670
5671 #ifdef DEBUG
5672 STATIC struct xfs_buf *
5673 xfs_bmap_get_bp(
5674 struct xfs_btree_cur *cur,
5675 xfs_fsblock_t bno)
5676 {
5677 struct xfs_log_item_desc *lidp;
5678 int i;
5679
5680 if (!cur)
5681 return NULL;
5682
5683 for (i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
5684 if (!cur->bc_bufs[i])
5685 break;
5686 if (XFS_BUF_ADDR(cur->bc_bufs[i]) == bno)
5687 return cur->bc_bufs[i];
5688 }
5689
5690 /* Chase down all the log items to see if the bp is there */
5691 list_for_each_entry(lidp, &cur->bc_tp->t_items, lid_trans) {
5692 struct xfs_buf_log_item *bip;
5693 bip = (struct xfs_buf_log_item *)lidp->lid_item;
5694 if (bip->bli_item.li_type == XFS_LI_BUF &&
5695 XFS_BUF_ADDR(bip->bli_buf) == bno)
5696 return bip->bli_buf;
5697 }
5698
5699 return NULL;
5700 }
5701
5702 STATIC void
5703 xfs_check_block(
5704 struct xfs_btree_block *block,
5705 xfs_mount_t *mp,
5706 int root,
5707 short sz)
5708 {
5709 int i, j, dmxr;
5710 __be64 *pp, *thispa; /* pointer to block address */
5711 xfs_bmbt_key_t *prevp, *keyp;
5712
5713 ASSERT(be16_to_cpu(block->bb_level) > 0);
5714
5715 prevp = NULL;
5716 for( i = 1; i <= xfs_btree_get_numrecs(block); i++) {
5717 dmxr = mp->m_bmap_dmxr[0];
5718 keyp = XFS_BMBT_KEY_ADDR(mp, block, i);
5719
5720 if (prevp) {
5721 ASSERT(be64_to_cpu(prevp->br_startoff) <
5722 be64_to_cpu(keyp->br_startoff));
5723 }
5724 prevp = keyp;
5725
5726 /*
5727 * Compare the block numbers to see if there are dups.
5728 */
5729 if (root)
5730 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, i, sz);
5731 else
5732 pp = XFS_BMBT_PTR_ADDR(mp, block, i, dmxr);
5733
5734 for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
5735 if (root)
5736 thispa = XFS_BMAP_BROOT_PTR_ADDR(mp, block, j, sz);
5737 else
5738 thispa = XFS_BMBT_PTR_ADDR(mp, block, j, dmxr);
5739 if (*thispa == *pp) {
5740 xfs_warn(mp, "%s: thispa(%d) == pp(%d) %Ld",
5741 __func__, j, i,
5742 (unsigned long long)be64_to_cpu(*thispa));
5743 panic("%s: ptrs are equal in node\n",
5744 __func__);
5745 }
5746 }
5747 }
5748 }
5749
5750 /*
5751 * Check that the extents for the inode ip are in the right order in all
5752 * btree leaves.
5753 */
5754
5755 STATIC void
5756 xfs_bmap_check_leaf_extents(
5757 xfs_btree_cur_t *cur, /* btree cursor or null */
5758 xfs_inode_t *ip, /* incore inode pointer */
5759 int whichfork) /* data or attr fork */
5760 {
5761 struct xfs_btree_block *block; /* current btree block */
5762 xfs_fsblock_t bno; /* block # of "block" */
5763 xfs_buf_t *bp; /* buffer for "block" */
5764 int error; /* error return value */
5765 xfs_extnum_t i=0, j; /* index into the extents list */
5766 xfs_ifork_t *ifp; /* fork structure */
5767 int level; /* btree level, for checking */
5768 xfs_mount_t *mp; /* file system mount structure */
5769 __be64 *pp; /* pointer to block address */
5770 xfs_bmbt_rec_t *ep; /* pointer to current extent */
5771 xfs_bmbt_rec_t last = {0, 0}; /* last extent in prev block */
5772 xfs_bmbt_rec_t *nextp; /* pointer to next extent */
5773 int bp_release = 0;
5774
5775 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
5776 return;
5777 }
5778
5779 bno = NULLFSBLOCK;
5780 mp = ip->i_mount;
5781 ifp = XFS_IFORK_PTR(ip, whichfork);
5782 block = ifp->if_broot;
5783 /*
5784 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
5785 */
5786 level = be16_to_cpu(block->bb_level);
5787 ASSERT(level > 0);
5788 xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
5789 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
5790 bno = be64_to_cpu(*pp);
5791
5792 ASSERT(bno != NULLDFSBNO);
5793 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
5794 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
5795
5796 /*
5797 * Go down the tree until leaf level is reached, following the first
5798 * pointer (leftmost) at each level.
5799 */
5800 while (level-- > 0) {
5801 /* See if buf is in cur first */
5802 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
5803 if (bp) {
5804 bp_release = 0;
5805 } else {
5806 bp_release = 1;
5807 }
5808 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
5809 XFS_BMAP_BTREE_REF)))
5810 goto error_norelse;
5811 block = XFS_BUF_TO_BLOCK(bp);
5812 XFS_WANT_CORRUPTED_GOTO(
5813 xfs_bmap_sanity_check(mp, bp, level),
5814 error0);
5815 if (level == 0)
5816 break;
5817
5818 /*
5819 * Check this block for basic sanity (increasing keys and
5820 * no duplicate blocks).
5821 */
5822
5823 xfs_check_block(block, mp, 0, 0);
5824 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
5825 bno = be64_to_cpu(*pp);
5826 XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
5827 if (bp_release) {
5828 bp_release = 0;
5829 xfs_trans_brelse(NULL, bp);
5830 }
5831 }
5832
5833 /*
5834 * Here with bp and block set to the leftmost leaf node in the tree.
5835 */
5836 i = 0;
5837
5838 /*
5839 * Loop over all leaf nodes checking that all extents are in the right order.
5840 */
5841 for (;;) {
5842 xfs_fsblock_t nextbno;
5843 xfs_extnum_t num_recs;
5844
5845
5846 num_recs = xfs_btree_get_numrecs(block);
5847
5848 /*
5849 * Read-ahead the next leaf block, if any.
5850 */
5851
5852 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
5853
5854 /*
5855 * Check all the extents to make sure they are OK.
5856 * If we had a previous block, the last entry should
5857 * conform with the first entry in this one.
5858 */
5859
5860 ep = XFS_BMBT_REC_ADDR(mp, block, 1);
5861 if (i) {
5862 ASSERT(xfs_bmbt_disk_get_startoff(&last) +
5863 xfs_bmbt_disk_get_blockcount(&last) <=
5864 xfs_bmbt_disk_get_startoff(ep));
5865 }
5866 for (j = 1; j < num_recs; j++) {
5867 nextp = XFS_BMBT_REC_ADDR(mp, block, j + 1);
5868 ASSERT(xfs_bmbt_disk_get_startoff(ep) +
5869 xfs_bmbt_disk_get_blockcount(ep) <=
5870 xfs_bmbt_disk_get_startoff(nextp));
5871 ep = nextp;
5872 }
5873
5874 last = *ep;
5875 i += num_recs;
5876 if (bp_release) {
5877 bp_release = 0;
5878 xfs_trans_brelse(NULL, bp);
5879 }
5880 bno = nextbno;
5881 /*
5882 * If we've reached the end, stop.
5883 */
5884 if (bno == NULLFSBLOCK)
5885 break;
5886
5887 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
5888 if (bp) {
5889 bp_release = 0;
5890 } else {
5891 bp_release = 1;
5892 }
5893 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
5894 XFS_BMAP_BTREE_REF)))
5895 goto error_norelse;
5896 block = XFS_BUF_TO_BLOCK(bp);
5897 }
5898 if (bp_release) {
5899 bp_release = 0;
5900 xfs_trans_brelse(NULL, bp);
5901 }
5902 return;
5903
5904 error0:
5905 xfs_warn(mp, "%s: at error0", __func__);
5906 if (bp_release)
5907 xfs_trans_brelse(NULL, bp);
5908 error_norelse:
5909 xfs_warn(mp, "%s: BAD after btree leaves for %d extents",
5910 __func__, i);
5911 panic("%s: CORRUPTED BTREE OR SOMETHING", __func__);
5912 return;
5913 }
5914 #endif
5915
5916 /*
5917 * Count fsblocks of the given fork.
5918 */
5919 int /* error */
5920 xfs_bmap_count_blocks(
5921 xfs_trans_t *tp, /* transaction pointer */
5922 xfs_inode_t *ip, /* incore inode */
5923 int whichfork, /* data or attr fork */
5924 int *count) /* out: count of blocks */
5925 {
5926 struct xfs_btree_block *block; /* current btree block */
5927 xfs_fsblock_t bno; /* block # of "block" */
5928 xfs_ifork_t *ifp; /* fork structure */
5929 int level; /* btree level, for checking */
5930 xfs_mount_t *mp; /* file system mount structure */
5931 __be64 *pp; /* pointer to block address */
5932
5933 bno = NULLFSBLOCK;
5934 mp = ip->i_mount;
5935 ifp = XFS_IFORK_PTR(ip, whichfork);
5936 if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) {
5937 xfs_bmap_count_leaves(ifp, 0,
5938 ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t),
5939 count);
5940 return 0;
5941 }
5942
5943 /*
5944 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
5945 */
5946 block = ifp->if_broot;
5947 level = be16_to_cpu(block->bb_level);
5948 ASSERT(level > 0);
5949 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
5950 bno = be64_to_cpu(*pp);
5951 ASSERT(bno != NULLDFSBNO);
5952 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
5953 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
5954
5955 if (unlikely(xfs_bmap_count_tree(mp, tp, ifp, bno, level, count) < 0)) {
5956 XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW,
5957 mp);
5958 return XFS_ERROR(EFSCORRUPTED);
5959 }
5960
5961 return 0;
5962 }
5963
5964 /*
5965 * Recursively walks each level of a btree
5966 * to count total fsblocks is use.
5967 */
5968 STATIC int /* error */
5969 xfs_bmap_count_tree(
5970 xfs_mount_t *mp, /* file system mount point */
5971 xfs_trans_t *tp, /* transaction pointer */
5972 xfs_ifork_t *ifp, /* inode fork pointer */
5973 xfs_fsblock_t blockno, /* file system block number */
5974 int levelin, /* level in btree */
5975 int *count) /* Count of blocks */
5976 {
5977 int error;
5978 xfs_buf_t *bp, *nbp;
5979 int level = levelin;
5980 __be64 *pp;
5981 xfs_fsblock_t bno = blockno;
5982 xfs_fsblock_t nextbno;
5983 struct xfs_btree_block *block, *nextblock;
5984 int numrecs;
5985
5986 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF)))
5987 return error;
5988 *count += 1;
5989 block = XFS_BUF_TO_BLOCK(bp);
5990
5991 if (--level) {
5992 /* Not at node above leaves, count this level of nodes */
5993 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
5994 while (nextbno != NULLFSBLOCK) {
5995 if ((error = xfs_btree_read_bufl(mp, tp, nextbno,
5996 0, &nbp, XFS_BMAP_BTREE_REF)))
5997 return error;
5998 *count += 1;
5999 nextblock = XFS_BUF_TO_BLOCK(nbp);
6000 nextbno = be64_to_cpu(nextblock->bb_u.l.bb_rightsib);
6001 xfs_trans_brelse(tp, nbp);
6002 }
6003
6004 /* Dive to the next level */
6005 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
6006 bno = be64_to_cpu(*pp);
6007 if (unlikely((error =
6008 xfs_bmap_count_tree(mp, tp, ifp, bno, level, count)) < 0)) {
6009 xfs_trans_brelse(tp, bp);
6010 XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
6011 XFS_ERRLEVEL_LOW, mp);
6012 return XFS_ERROR(EFSCORRUPTED);
6013 }
6014 xfs_trans_brelse(tp, bp);
6015 } else {
6016 /* count all level 1 nodes and their leaves */
6017 for (;;) {
6018 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
6019 numrecs = be16_to_cpu(block->bb_numrecs);
6020 xfs_bmap_disk_count_leaves(mp, block, numrecs, count);
6021 xfs_trans_brelse(tp, bp);
6022 if (nextbno == NULLFSBLOCK)
6023 break;
6024 bno = nextbno;
6025 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
6026 XFS_BMAP_BTREE_REF)))
6027 return error;
6028 *count += 1;
6029 block = XFS_BUF_TO_BLOCK(bp);
6030 }
6031 }
6032 return 0;
6033 }
6034
6035 /*
6036 * Count leaf blocks given a range of extent records.
6037 */
6038 STATIC void
6039 xfs_bmap_count_leaves(
6040 xfs_ifork_t *ifp,
6041 xfs_extnum_t idx,
6042 int numrecs,
6043 int *count)
6044 {
6045 int b;
6046
6047 for (b = 0; b < numrecs; b++) {
6048 xfs_bmbt_rec_host_t *frp = xfs_iext_get_ext(ifp, idx + b);
6049 *count += xfs_bmbt_get_blockcount(frp);
6050 }
6051 }
6052
6053 /*
6054 * Count leaf blocks given a range of extent records originally
6055 * in btree format.
6056 */
6057 STATIC void
6058 xfs_bmap_disk_count_leaves(
6059 struct xfs_mount *mp,
6060 struct xfs_btree_block *block,
6061 int numrecs,
6062 int *count)
6063 {
6064 int b;
6065 xfs_bmbt_rec_t *frp;
6066
6067 for (b = 1; b <= numrecs; b++) {
6068 frp = XFS_BMBT_REC_ADDR(mp, block, b);
6069 *count += xfs_bmbt_disk_get_blockcount(frp);
6070 }
6071 }
6072
6073 /*
6074 * dead simple method of punching delalyed allocation blocks from a range in
6075 * the inode. Walks a block at a time so will be slow, but is only executed in
6076 * rare error cases so the overhead is not critical. This will alays punch out
6077 * both the start and end blocks, even if the ranges only partially overlap
6078 * them, so it is up to the caller to ensure that partial blocks are not
6079 * passed in.
6080 */
6081 int
6082 xfs_bmap_punch_delalloc_range(
6083 struct xfs_inode *ip,
6084 xfs_fileoff_t start_fsb,
6085 xfs_fileoff_t length)
6086 {
6087 xfs_fileoff_t remaining = length;
6088 int error = 0;
6089
6090 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
6091
6092 do {
6093 int done;
6094 xfs_bmbt_irec_t imap;
6095 int nimaps = 1;
6096 xfs_fsblock_t firstblock;
6097 xfs_bmap_free_t flist;
6098
6099 /*
6100 * Map the range first and check that it is a delalloc extent
6101 * before trying to unmap the range. Otherwise we will be
6102 * trying to remove a real extent (which requires a
6103 * transaction) or a hole, which is probably a bad idea...
6104 */
6105 error = xfs_bmapi(NULL, ip, start_fsb, 1,
6106 XFS_BMAPI_ENTIRE, NULL, 0, &imap,
6107 &nimaps, NULL);
6108
6109 if (error) {
6110 /* something screwed, just bail */
6111 if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
6112 xfs_alert(ip->i_mount,
6113 "Failed delalloc mapping lookup ino %lld fsb %lld.",
6114 ip->i_ino, start_fsb);
6115 }
6116 break;
6117 }
6118 if (!nimaps) {
6119 /* nothing there */
6120 goto next_block;
6121 }
6122 if (imap.br_startblock != DELAYSTARTBLOCK) {
6123 /* been converted, ignore */
6124 goto next_block;
6125 }
6126 WARN_ON(imap.br_blockcount == 0);
6127
6128 /*
6129 * Note: while we initialise the firstblock/flist pair, they
6130 * should never be used because blocks should never be
6131 * allocated or freed for a delalloc extent and hence we need
6132 * don't cancel or finish them after the xfs_bunmapi() call.
6133 */
6134 xfs_bmap_init(&flist, &firstblock);
6135 error = xfs_bunmapi(NULL, ip, start_fsb, 1, 0, 1, &firstblock,
6136 &flist, &done);
6137 if (error)
6138 break;
6139
6140 ASSERT(!flist.xbf_count && !flist.xbf_first);
6141 next_block:
6142 start_fsb++;
6143 remaining--;
6144 } while(remaining > 0);
6145
6146 return error;
6147 }
linux-next