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gspca: Fix falling back to lower isoc alt settings
[zen-stable.git] / fs / xfs / xfs_bmap.c
blobd0ab78837057815f17605150d31a633c2eeb2739
1 /*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_inum.h"
24 #include "xfs_trans.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_dir2.h"
28 #include "xfs_da_btree.h"
29 #include "xfs_bmap_btree.h"
30 #include "xfs_alloc_btree.h"
31 #include "xfs_ialloc_btree.h"
32 #include "xfs_dinode.h"
33 #include "xfs_inode.h"
34 #include "xfs_btree.h"
35 #include "xfs_mount.h"
36 #include "xfs_itable.h"
37 #include "xfs_inode_item.h"
38 #include "xfs_extfree_item.h"
39 #include "xfs_alloc.h"
40 #include "xfs_bmap.h"
41 #include "xfs_rtalloc.h"
42 #include "xfs_error.h"
43 #include "xfs_attr_leaf.h"
44 #include "xfs_rw.h"
45 #include "xfs_quota.h"
46 #include "xfs_trans_space.h"
47 #include "xfs_buf_item.h"
48 #include "xfs_filestream.h"
49 #include "xfs_vnodeops.h"
50 #include "xfs_trace.h"
51
52
53 kmem_zone_t *xfs_bmap_free_item_zone;
54
55 /*
56 * Prototypes for internal bmap routines.
57 */
58
59 #ifdef DEBUG
60 STATIC void
61 xfs_bmap_check_leaf_extents(
62 struct xfs_btree_cur *cur,
63 struct xfs_inode *ip,
64 int whichfork);
65 #else
66 #define xfs_bmap_check_leaf_extents(cur, ip, whichfork) do { } while (0)
67 #endif
68
69
70 /*
71 * Called from xfs_bmap_add_attrfork to handle extents format files.
72 */
73 STATIC int /* error */
74 xfs_bmap_add_attrfork_extents(
75 xfs_trans_t *tp, /* transaction pointer */
76 xfs_inode_t *ip, /* incore inode pointer */
77 xfs_fsblock_t *firstblock, /* first block allocated */
78 xfs_bmap_free_t *flist, /* blocks to free at commit */
79 int *flags); /* inode logging flags */
80
81 /*
82 * Called from xfs_bmap_add_attrfork to handle local format files.
83 */
84 STATIC int /* error */
85 xfs_bmap_add_attrfork_local(
86 xfs_trans_t *tp, /* transaction pointer */
87 xfs_inode_t *ip, /* incore inode pointer */
88 xfs_fsblock_t *firstblock, /* first block allocated */
89 xfs_bmap_free_t *flist, /* blocks to free at commit */
90 int *flags); /* inode logging flags */
91
92 /*
93 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
94 * It figures out where to ask the underlying allocator to put the new extent.
95 */
96 STATIC int /* error */
97 xfs_bmap_alloc(
98 xfs_bmalloca_t *ap); /* bmap alloc argument struct */
99
100 /*
101 * Transform a btree format file with only one leaf node, where the
102 * extents list will fit in the inode, into an extents format file.
103 * Since the file extents are already in-core, all we have to do is
104 * give up the space for the btree root and pitch the leaf block.
105 */
106 STATIC int /* error */
107 xfs_bmap_btree_to_extents(
108 xfs_trans_t *tp, /* transaction pointer */
109 xfs_inode_t *ip, /* incore inode pointer */
110 xfs_btree_cur_t *cur, /* btree cursor */
111 int *logflagsp, /* inode logging flags */
112 int whichfork); /* data or attr fork */
113
114 /*
115 * Remove the entry "free" from the free item list. Prev points to the
116 * previous entry, unless "free" is the head of the list.
117 */
118 STATIC void
119 xfs_bmap_del_free(
120 xfs_bmap_free_t *flist, /* free item list header */
121 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
122 xfs_bmap_free_item_t *free); /* list item to be freed */
123
124 /*
125 * Convert an extents-format file into a btree-format file.
126 * The new file will have a root block (in the inode) and a single child block.
127 */
128 STATIC int /* error */
129 xfs_bmap_extents_to_btree(
130 xfs_trans_t *tp, /* transaction pointer */
131 xfs_inode_t *ip, /* incore inode pointer */
132 xfs_fsblock_t *firstblock, /* first-block-allocated */
133 xfs_bmap_free_t *flist, /* blocks freed in xaction */
134 xfs_btree_cur_t **curp, /* cursor returned to caller */
135 int wasdel, /* converting a delayed alloc */
136 int *logflagsp, /* inode logging flags */
137 int whichfork); /* data or attr fork */
138
139 /*
140 * Convert a local file to an extents file.
141 * This code is sort of bogus, since the file data needs to get
142 * logged so it won't be lost. The bmap-level manipulations are ok, though.
143 */
144 STATIC int /* error */
145 xfs_bmap_local_to_extents(
146 xfs_trans_t *tp, /* transaction pointer */
147 xfs_inode_t *ip, /* incore inode pointer */
148 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
149 xfs_extlen_t total, /* total blocks needed by transaction */
150 int *logflagsp, /* inode logging flags */
151 int whichfork); /* data or attr fork */
152
153 /*
154 * Search the extents list for the inode, for the extent containing bno.
155 * If bno lies in a hole, point to the next entry. If bno lies past eof,
156 * *eofp will be set, and *prevp will contain the last entry (null if none).
157 * Else, *lastxp will be set to the index of the found
158 * entry; *gotp will contain the entry.
159 */
160 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
161 xfs_bmap_search_extents(
162 xfs_inode_t *ip, /* incore inode pointer */
163 xfs_fileoff_t bno, /* block number searched for */
164 int whichfork, /* data or attr fork */
165 int *eofp, /* out: end of file found */
166 xfs_extnum_t *lastxp, /* out: last extent index */
167 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
168 xfs_bmbt_irec_t *prevp); /* out: previous extent entry found */
169
170 /*
171 * Compute the worst-case number of indirect blocks that will be used
172 * for ip's delayed extent of length "len".
173 */
174 STATIC xfs_filblks_t
175 xfs_bmap_worst_indlen(
176 xfs_inode_t *ip, /* incore inode pointer */
177 xfs_filblks_t len); /* delayed extent length */
178
179 #ifdef DEBUG
180 /*
181 * Perform various validation checks on the values being returned
182 * from xfs_bmapi().
183 */
184 STATIC void
185 xfs_bmap_validate_ret(
186 xfs_fileoff_t bno,
187 xfs_filblks_t len,
188 int flags,
189 xfs_bmbt_irec_t *mval,
190 int nmap,
191 int ret_nmap);
192 #else
193 #define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
194 #endif /* DEBUG */
195
196 STATIC int
197 xfs_bmap_count_tree(
198 xfs_mount_t *mp,
199 xfs_trans_t *tp,
200 xfs_ifork_t *ifp,
201 xfs_fsblock_t blockno,
202 int levelin,
203 int *count);
204
205 STATIC void
206 xfs_bmap_count_leaves(
207 xfs_ifork_t *ifp,
208 xfs_extnum_t idx,
209 int numrecs,
210 int *count);
211
212 STATIC void
213 xfs_bmap_disk_count_leaves(
214 struct xfs_mount *mp,
215 struct xfs_btree_block *block,
216 int numrecs,
217 int *count);
218
219 /*
220 * Bmap internal routines.
221 */
222
223 STATIC int /* error */
224 xfs_bmbt_lookup_eq(
225 struct xfs_btree_cur *cur,
226 xfs_fileoff_t off,
227 xfs_fsblock_t bno,
228 xfs_filblks_t len,
229 int *stat) /* success/failure */
230 {
231 cur->bc_rec.b.br_startoff = off;
232 cur->bc_rec.b.br_startblock = bno;
233 cur->bc_rec.b.br_blockcount = len;
234 return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
235 }
236
237 STATIC int /* error */
238 xfs_bmbt_lookup_ge(
239 struct xfs_btree_cur *cur,
240 xfs_fileoff_t off,
241 xfs_fsblock_t bno,
242 xfs_filblks_t len,
243 int *stat) /* success/failure */
244 {
245 cur->bc_rec.b.br_startoff = off;
246 cur->bc_rec.b.br_startblock = bno;
247 cur->bc_rec.b.br_blockcount = len;
248 return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
249 }
250
251 /*
252 * Update the record referred to by cur to the value given
253 * by [off, bno, len, state].
254 * This either works (return 0) or gets an EFSCORRUPTED error.
255 */
256 STATIC int
257 xfs_bmbt_update(
258 struct xfs_btree_cur *cur,
259 xfs_fileoff_t off,
260 xfs_fsblock_t bno,
261 xfs_filblks_t len,
262 xfs_exntst_t state)
263 {
264 union xfs_btree_rec rec;
265
266 xfs_bmbt_disk_set_allf(&rec.bmbt, off, bno, len, state);
267 return xfs_btree_update(cur, &rec);
268 }
269
270 /*
271 * Called from xfs_bmap_add_attrfork to handle btree format files.
272 */
273 STATIC int /* error */
274 xfs_bmap_add_attrfork_btree(
275 xfs_trans_t *tp, /* transaction pointer */
276 xfs_inode_t *ip, /* incore inode pointer */
277 xfs_fsblock_t *firstblock, /* first block allocated */
278 xfs_bmap_free_t *flist, /* blocks to free at commit */
279 int *flags) /* inode logging flags */
280 {
281 xfs_btree_cur_t *cur; /* btree cursor */
282 int error; /* error return value */
283 xfs_mount_t *mp; /* file system mount struct */
284 int stat; /* newroot status */
285
286 mp = ip->i_mount;
287 if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
288 *flags |= XFS_ILOG_DBROOT;
289 else {
290 cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
291 cur->bc_private.b.flist = flist;
292 cur->bc_private.b.firstblock = *firstblock;
293 if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
294 goto error0;
295 /* must be at least one entry */
296 XFS_WANT_CORRUPTED_GOTO(stat == 1, error0);
297 if ((error = xfs_btree_new_iroot(cur, flags, &stat)))
298 goto error0;
299 if (stat == 0) {
300 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
301 return XFS_ERROR(ENOSPC);
302 }
303 *firstblock = cur->bc_private.b.firstblock;
304 cur->bc_private.b.allocated = 0;
305 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
306 }
307 return 0;
308 error0:
309 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
310 return error;
311 }
312
313 /*
314 * Called from xfs_bmap_add_attrfork to handle extents format files.
315 */
316 STATIC int /* error */
317 xfs_bmap_add_attrfork_extents(
318 xfs_trans_t *tp, /* transaction pointer */
319 xfs_inode_t *ip, /* incore inode pointer */
320 xfs_fsblock_t *firstblock, /* first block allocated */
321 xfs_bmap_free_t *flist, /* blocks to free at commit */
322 int *flags) /* inode logging flags */
323 {
324 xfs_btree_cur_t *cur; /* bmap btree cursor */
325 int error; /* error return value */
326
327 if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
328 return 0;
329 cur = NULL;
330 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist, &cur, 0,
331 flags, XFS_DATA_FORK);
332 if (cur) {
333 cur->bc_private.b.allocated = 0;
334 xfs_btree_del_cursor(cur,
335 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
336 }
337 return error;
338 }
339
340 /*
341 * Called from xfs_bmap_add_attrfork to handle local format files.
342 */
343 STATIC int /* error */
344 xfs_bmap_add_attrfork_local(
345 xfs_trans_t *tp, /* transaction pointer */
346 xfs_inode_t *ip, /* incore inode pointer */
347 xfs_fsblock_t *firstblock, /* first block allocated */
348 xfs_bmap_free_t *flist, /* blocks to free at commit */
349 int *flags) /* inode logging flags */
350 {
351 xfs_da_args_t dargs; /* args for dir/attr code */
352 int error; /* error return value */
353 xfs_mount_t *mp; /* mount structure pointer */
354
355 if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
356 return 0;
357 if (S_ISDIR(ip->i_d.di_mode)) {
358 mp = ip->i_mount;
359 memset(&dargs, 0, sizeof(dargs));
360 dargs.dp = ip;
361 dargs.firstblock = firstblock;
362 dargs.flist = flist;
363 dargs.total = mp->m_dirblkfsbs;
364 dargs.whichfork = XFS_DATA_FORK;
365 dargs.trans = tp;
366 error = xfs_dir2_sf_to_block(&dargs);
367 } else
368 error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
369 XFS_DATA_FORK);
370 return error;
371 }
372
373 /*
374 * Convert a delayed allocation to a real allocation.
375 */
376 STATIC int /* error */
377 xfs_bmap_add_extent_delay_real(
378 struct xfs_bmalloca *bma)
379 {
380 struct xfs_bmbt_irec *new = &bma->got;
381 int diff; /* temp value */
382 xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
383 int error; /* error return value */
384 int i; /* temp state */
385 xfs_ifork_t *ifp; /* inode fork pointer */
386 xfs_fileoff_t new_endoff; /* end offset of new entry */
387 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
388 /* left is 0, right is 1, prev is 2 */
389 int rval=0; /* return value (logging flags) */
390 int state = 0;/* state bits, accessed thru macros */
391 xfs_filblks_t da_new; /* new count del alloc blocks used */
392 xfs_filblks_t da_old; /* old count del alloc blocks used */
393 xfs_filblks_t temp=0; /* value for da_new calculations */
394 xfs_filblks_t temp2=0;/* value for da_new calculations */
395 int tmp_rval; /* partial logging flags */
396
397 ifp = XFS_IFORK_PTR(bma->ip, XFS_DATA_FORK);
398
399 ASSERT(bma->idx >= 0);
400 ASSERT(bma->idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
401 ASSERT(!isnullstartblock(new->br_startblock));
402 ASSERT(!bma->cur ||
403 (bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
404
405 XFS_STATS_INC(xs_add_exlist);
406
407 #define LEFT r[0]
408 #define RIGHT r[1]
409 #define PREV r[2]
410
411 /*
412 * Set up a bunch of variables to make the tests simpler.
413 */
414 ep = xfs_iext_get_ext(ifp, bma->idx);
415 xfs_bmbt_get_all(ep, &PREV);
416 new_endoff = new->br_startoff + new->br_blockcount;
417 ASSERT(PREV.br_startoff <= new->br_startoff);
418 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
419
420 da_old = startblockval(PREV.br_startblock);
421 da_new = 0;
422
423 /*
424 * Set flags determining what part of the previous delayed allocation
425 * extent is being replaced by a real allocation.
426 */
427 if (PREV.br_startoff == new->br_startoff)
428 state |= BMAP_LEFT_FILLING;
429 if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
430 state |= BMAP_RIGHT_FILLING;
431
432 /*
433 * Check and set flags if this segment has a left neighbor.
434 * Don't set contiguous if the combined extent would be too large.
435 */
436 if (bma->idx > 0) {
437 state |= BMAP_LEFT_VALID;
438 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), &LEFT);
439
440 if (isnullstartblock(LEFT.br_startblock))
441 state |= BMAP_LEFT_DELAY;
442 }
443
444 if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
445 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
446 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
447 LEFT.br_state == new->br_state &&
448 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
449 state |= BMAP_LEFT_CONTIG;
450
451 /*
452 * Check and set flags if this segment has a right neighbor.
453 * Don't set contiguous if the combined extent would be too large.
454 * Also check for all-three-contiguous being too large.
455 */
456 if (bma->idx < bma->ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
457 state |= BMAP_RIGHT_VALID;
458 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx + 1), &RIGHT);
459
460 if (isnullstartblock(RIGHT.br_startblock))
461 state |= BMAP_RIGHT_DELAY;
462 }
463
464 if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
465 new_endoff == RIGHT.br_startoff &&
466 new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
467 new->br_state == RIGHT.br_state &&
468 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
469 ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
470 BMAP_RIGHT_FILLING)) !=
471 (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
472 BMAP_RIGHT_FILLING) ||
473 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
474 <= MAXEXTLEN))
475 state |= BMAP_RIGHT_CONTIG;
476
477 error = 0;
478 /*
479 * Switch out based on the FILLING and CONTIG state bits.
480 */
481 switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
482 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
483 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
484 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
485 /*
486 * Filling in all of a previously delayed allocation extent.
487 * The left and right neighbors are both contiguous with new.
488 */
489 bma->idx--;
490 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
491 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
492 LEFT.br_blockcount + PREV.br_blockcount +
493 RIGHT.br_blockcount);
494 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
495
496 xfs_iext_remove(bma->ip, bma->idx + 1, 2, state);
497 bma->ip->i_d.di_nextents--;
498 if (bma->cur == NULL)
499 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
500 else {
501 rval = XFS_ILOG_CORE;
502 error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
503 RIGHT.br_startblock,
504 RIGHT.br_blockcount, &i);
505 if (error)
506 goto done;
507 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
508 error = xfs_btree_delete(bma->cur, &i);
509 if (error)
510 goto done;
511 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
512 error = xfs_btree_decrement(bma->cur, 0, &i);
513 if (error)
514 goto done;
515 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
516 error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
517 LEFT.br_startblock,
518 LEFT.br_blockcount +
519 PREV.br_blockcount +
520 RIGHT.br_blockcount, LEFT.br_state);
521 if (error)
522 goto done;
523 }
524 break;
525
526 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
527 /*
528 * Filling in all of a previously delayed allocation extent.
529 * The left neighbor is contiguous, the right is not.
530 */
531 bma->idx--;
532
533 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
534 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
535 LEFT.br_blockcount + PREV.br_blockcount);
536 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
537
538 xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
539 if (bma->cur == NULL)
540 rval = XFS_ILOG_DEXT;
541 else {
542 rval = 0;
543 error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
544 LEFT.br_startblock, LEFT.br_blockcount,
545 &i);
546 if (error)
547 goto done;
548 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
549 error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
550 LEFT.br_startblock,
551 LEFT.br_blockcount +
552 PREV.br_blockcount, LEFT.br_state);
553 if (error)
554 goto done;
555 }
556 break;
557
558 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
559 /*
560 * Filling in all of a previously delayed allocation extent.
561 * The right neighbor is contiguous, the left is not.
562 */
563 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
564 xfs_bmbt_set_startblock(ep, new->br_startblock);
565 xfs_bmbt_set_blockcount(ep,
566 PREV.br_blockcount + RIGHT.br_blockcount);
567 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
568
569 xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
570 if (bma->cur == NULL)
571 rval = XFS_ILOG_DEXT;
572 else {
573 rval = 0;
574 error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
575 RIGHT.br_startblock,
576 RIGHT.br_blockcount, &i);
577 if (error)
578 goto done;
579 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
580 error = xfs_bmbt_update(bma->cur, PREV.br_startoff,
581 new->br_startblock,
582 PREV.br_blockcount +
583 RIGHT.br_blockcount, PREV.br_state);
584 if (error)
585 goto done;
586 }
587 break;
588
589 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
590 /*
591 * Filling in all of a previously delayed allocation extent.
592 * Neither the left nor right neighbors are contiguous with
593 * the new one.
594 */
595 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
596 xfs_bmbt_set_startblock(ep, new->br_startblock);
597 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
598
599 bma->ip->i_d.di_nextents++;
600 if (bma->cur == NULL)
601 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
602 else {
603 rval = XFS_ILOG_CORE;
604 error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
605 new->br_startblock, new->br_blockcount,
606 &i);
607 if (error)
608 goto done;
609 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
610 bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
611 error = xfs_btree_insert(bma->cur, &i);
612 if (error)
613 goto done;
614 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
615 }
616 break;
617
618 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
619 /*
620 * Filling in the first part of a previous delayed allocation.
621 * The left neighbor is contiguous.
622 */
623 trace_xfs_bmap_pre_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
624 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx - 1),
625 LEFT.br_blockcount + new->br_blockcount);
626 xfs_bmbt_set_startoff(ep,
627 PREV.br_startoff + new->br_blockcount);
628 trace_xfs_bmap_post_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
629
630 temp = PREV.br_blockcount - new->br_blockcount;
631 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
632 xfs_bmbt_set_blockcount(ep, temp);
633 if (bma->cur == NULL)
634 rval = XFS_ILOG_DEXT;
635 else {
636 rval = 0;
637 error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
638 LEFT.br_startblock, LEFT.br_blockcount,
639 &i);
640 if (error)
641 goto done;
642 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
643 error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
644 LEFT.br_startblock,
645 LEFT.br_blockcount +
646 new->br_blockcount,
647 LEFT.br_state);
648 if (error)
649 goto done;
650 }
651 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
652 startblockval(PREV.br_startblock));
653 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
654 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
655
656 bma->idx--;
657 break;
658
659 case BMAP_LEFT_FILLING:
660 /*
661 * Filling in the first part of a previous delayed allocation.
662 * The left neighbor is not contiguous.
663 */
664 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
665 xfs_bmbt_set_startoff(ep, new_endoff);
666 temp = PREV.br_blockcount - new->br_blockcount;
667 xfs_bmbt_set_blockcount(ep, temp);
668 xfs_iext_insert(bma->ip, bma->idx, 1, new, state);
669 bma->ip->i_d.di_nextents++;
670 if (bma->cur == NULL)
671 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
672 else {
673 rval = XFS_ILOG_CORE;
674 error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
675 new->br_startblock, new->br_blockcount,
676 &i);
677 if (error)
678 goto done;
679 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
680 bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
681 error = xfs_btree_insert(bma->cur, &i);
682 if (error)
683 goto done;
684 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
685 }
686 if (bma->ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
687 bma->ip->i_d.di_nextents > bma->ip->i_df.if_ext_max) {
688 error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
689 bma->firstblock, bma->flist,
690 &bma->cur, 1, &tmp_rval, XFS_DATA_FORK);
691 rval |= tmp_rval;
692 if (error)
693 goto done;
694 }
695 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
696 startblockval(PREV.br_startblock) -
697 (bma->cur ? bma->cur->bc_private.b.allocated : 0));
698 ep = xfs_iext_get_ext(ifp, bma->idx + 1);
699 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
700 trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
701 break;
702
703 case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
704 /*
705 * Filling in the last part of a previous delayed allocation.
706 * The right neighbor is contiguous with the new allocation.
707 */
708 temp = PREV.br_blockcount - new->br_blockcount;
709 trace_xfs_bmap_pre_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
710 xfs_bmbt_set_blockcount(ep, temp);
711 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx + 1),
712 new->br_startoff, new->br_startblock,
713 new->br_blockcount + RIGHT.br_blockcount,
714 RIGHT.br_state);
715 trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
716 if (bma->cur == NULL)
717 rval = XFS_ILOG_DEXT;
718 else {
719 rval = 0;
720 error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
721 RIGHT.br_startblock,
722 RIGHT.br_blockcount, &i);
723 if (error)
724 goto done;
725 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
726 error = xfs_bmbt_update(bma->cur, new->br_startoff,
727 new->br_startblock,
728 new->br_blockcount +
729 RIGHT.br_blockcount,
730 RIGHT.br_state);
731 if (error)
732 goto done;
733 }
734
735 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
736 startblockval(PREV.br_startblock));
737 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
738 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
739 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
740
741 bma->idx++;
742 break;
743
744 case BMAP_RIGHT_FILLING:
745 /*
746 * Filling in the last part of a previous delayed allocation.
747 * The right neighbor is not contiguous.
748 */
749 temp = PREV.br_blockcount - new->br_blockcount;
750 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
751 xfs_bmbt_set_blockcount(ep, temp);
752 xfs_iext_insert(bma->ip, bma->idx + 1, 1, new, state);
753 bma->ip->i_d.di_nextents++;
754 if (bma->cur == NULL)
755 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
756 else {
757 rval = XFS_ILOG_CORE;
758 error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
759 new->br_startblock, new->br_blockcount,
760 &i);
761 if (error)
762 goto done;
763 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
764 bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
765 error = xfs_btree_insert(bma->cur, &i);
766 if (error)
767 goto done;
768 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
769 }
770 if (bma->ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
771 bma->ip->i_d.di_nextents > bma->ip->i_df.if_ext_max) {
772 error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
773 bma->firstblock, bma->flist, &bma->cur, 1,
774 &tmp_rval, XFS_DATA_FORK);
775 rval |= tmp_rval;
776 if (error)
777 goto done;
778 }
779 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
780 startblockval(PREV.br_startblock) -
781 (bma->cur ? bma->cur->bc_private.b.allocated : 0));
782 ep = xfs_iext_get_ext(ifp, bma->idx);
783 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
784 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
785
786 bma->idx++;
787 break;
788
789 case 0:
790 /*
791 * Filling in the middle part of a previous delayed allocation.
792 * Contiguity is impossible here.
793 * This case is avoided almost all the time.
794 *
795 * We start with a delayed allocation:
796 *
797 * +ddddddddddddddddddddddddddddddddddddddddddddddddddddddd+
798 * PREV @ idx
799 *
800 * and we are allocating:
801 * +rrrrrrrrrrrrrrrrr+
802 * new
803 *
804 * and we set it up for insertion as:
805 * +ddddddddddddddddddd+rrrrrrrrrrrrrrrrr+ddddddddddddddddd+
806 * new
807 * PREV @ idx LEFT RIGHT
808 * inserted at idx + 1
809 */
810 temp = new->br_startoff - PREV.br_startoff;
811 temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
812 trace_xfs_bmap_pre_update(bma->ip, bma->idx, 0, _THIS_IP_);
813 xfs_bmbt_set_blockcount(ep, temp); /* truncate PREV */
814 LEFT = *new;
815 RIGHT.br_state = PREV.br_state;
816 RIGHT.br_startblock = nullstartblock(
817 (int)xfs_bmap_worst_indlen(bma->ip, temp2));
818 RIGHT.br_startoff = new_endoff;
819 RIGHT.br_blockcount = temp2;
820 /* insert LEFT (r[0]) and RIGHT (r[1]) at the same time */
821 xfs_iext_insert(bma->ip, bma->idx + 1, 2, &LEFT, state);
822 bma->ip->i_d.di_nextents++;
823 if (bma->cur == NULL)
824 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
825 else {
826 rval = XFS_ILOG_CORE;
827 error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
828 new->br_startblock, new->br_blockcount,
829 &i);
830 if (error)
831 goto done;
832 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
833 bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
834 error = xfs_btree_insert(bma->cur, &i);
835 if (error)
836 goto done;
837 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
838 }
839 if (bma->ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
840 bma->ip->i_d.di_nextents > bma->ip->i_df.if_ext_max) {
841 error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
842 bma->firstblock, bma->flist, &bma->cur,
843 1, &tmp_rval, XFS_DATA_FORK);
844 rval |= tmp_rval;
845 if (error)
846 goto done;
847 }
848 temp = xfs_bmap_worst_indlen(bma->ip, temp);
849 temp2 = xfs_bmap_worst_indlen(bma->ip, temp2);
850 diff = (int)(temp + temp2 - startblockval(PREV.br_startblock) -
851 (bma->cur ? bma->cur->bc_private.b.allocated : 0));
852 if (diff > 0) {
853 error = xfs_icsb_modify_counters(bma->ip->i_mount,
854 XFS_SBS_FDBLOCKS,
855 -((int64_t)diff), 0);
856 ASSERT(!error);
857 if (error)
858 goto done;
859 }
860
861 ep = xfs_iext_get_ext(ifp, bma->idx);
862 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
863 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
864 trace_xfs_bmap_pre_update(bma->ip, bma->idx + 2, state, _THIS_IP_);
865 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, bma->idx + 2),
866 nullstartblock((int)temp2));
867 trace_xfs_bmap_post_update(bma->ip, bma->idx + 2, state, _THIS_IP_);
868
869 bma->idx++;
870 da_new = temp + temp2;
871 break;
872
873 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
874 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
875 case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
876 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
877 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
878 case BMAP_LEFT_CONTIG:
879 case BMAP_RIGHT_CONTIG:
880 /*
881 * These cases are all impossible.
882 */
883 ASSERT(0);
884 }
885
886 /* convert to a btree if necessary */
887 if (XFS_IFORK_FORMAT(bma->ip, XFS_DATA_FORK) == XFS_DINODE_FMT_EXTENTS &&
888 XFS_IFORK_NEXTENTS(bma->ip, XFS_DATA_FORK) > ifp->if_ext_max) {
889 int tmp_logflags; /* partial log flag return val */
890
891 ASSERT(bma->cur == NULL);
892 error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
893 bma->firstblock, bma->flist, &bma->cur,
894 da_old > 0, &tmp_logflags, XFS_DATA_FORK);
895 bma->logflags |= tmp_logflags;
896 if (error)
897 goto done;
898 }
899
900 /* adjust for changes in reserved delayed indirect blocks */
901 if (da_old || da_new) {
902 temp = da_new;
903 if (bma->cur)
904 temp += bma->cur->bc_private.b.allocated;
905 ASSERT(temp <= da_old);
906 if (temp < da_old)
907 xfs_icsb_modify_counters(bma->ip->i_mount,
908 XFS_SBS_FDBLOCKS,
909 (int64_t)(da_old - temp), 0);
910 }
911
912 /* clear out the allocated field, done with it now in any case. */
913 if (bma->cur)
914 bma->cur->bc_private.b.allocated = 0;
915
916 xfs_bmap_check_leaf_extents(bma->cur, bma->ip, XFS_DATA_FORK);
917 done:
918 bma->logflags |= rval;
919 return error;
920 #undef LEFT
921 #undef RIGHT
922 #undef PREV
923 }
924
925 /*
926 * Convert an unwritten allocation to a real allocation or vice versa.
927 */
928 STATIC int /* error */
929 xfs_bmap_add_extent_unwritten_real(
930 struct xfs_trans *tp,
931 xfs_inode_t *ip, /* incore inode pointer */
932 xfs_extnum_t *idx, /* extent number to update/insert */
933 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
934 xfs_bmbt_irec_t *new, /* new data to add to file extents */
935 xfs_fsblock_t *first, /* pointer to firstblock variable */
936 xfs_bmap_free_t *flist, /* list of extents to be freed */
937 int *logflagsp) /* inode logging flags */
938 {
939 xfs_btree_cur_t *cur; /* btree cursor */
940 xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
941 int error; /* error return value */
942 int i; /* temp state */
943 xfs_ifork_t *ifp; /* inode fork pointer */
944 xfs_fileoff_t new_endoff; /* end offset of new entry */
945 xfs_exntst_t newext; /* new extent state */
946 xfs_exntst_t oldext; /* old extent state */
947 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
948 /* left is 0, right is 1, prev is 2 */
949 int rval=0; /* return value (logging flags) */
950 int state = 0;/* state bits, accessed thru macros */
951
952 *logflagsp = 0;
953
954 cur = *curp;
955 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
956
957 ASSERT(*idx >= 0);
958 ASSERT(*idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
959 ASSERT(!isnullstartblock(new->br_startblock));
960
961 XFS_STATS_INC(xs_add_exlist);
962
963 #define LEFT r[0]
964 #define RIGHT r[1]
965 #define PREV r[2]
966
967 /*
968 * Set up a bunch of variables to make the tests simpler.
969 */
970 error = 0;
971 ep = xfs_iext_get_ext(ifp, *idx);
972 xfs_bmbt_get_all(ep, &PREV);
973 newext = new->br_state;
974 oldext = (newext == XFS_EXT_UNWRITTEN) ?
975 XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
976 ASSERT(PREV.br_state == oldext);
977 new_endoff = new->br_startoff + new->br_blockcount;
978 ASSERT(PREV.br_startoff <= new->br_startoff);
979 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
980
981 /*
982 * Set flags determining what part of the previous oldext allocation
983 * extent is being replaced by a newext allocation.
984 */
985 if (PREV.br_startoff == new->br_startoff)
986 state |= BMAP_LEFT_FILLING;
987 if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
988 state |= BMAP_RIGHT_FILLING;
989
990 /*
991 * Check and set flags if this segment has a left neighbor.
992 * Don't set contiguous if the combined extent would be too large.
993 */
994 if (*idx > 0) {
995 state |= BMAP_LEFT_VALID;
996 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &LEFT);
997
998 if (isnullstartblock(LEFT.br_startblock))
999 state |= BMAP_LEFT_DELAY;
1000 }
1001
1002 if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
1003 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
1004 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
1005 LEFT.br_state == newext &&
1006 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1007 state |= BMAP_LEFT_CONTIG;
1008
1009 /*
1010 * Check and set flags if this segment has a right neighbor.
1011 * Don't set contiguous if the combined extent would be too large.
1012 * Also check for all-three-contiguous being too large.
1013 */
1014 if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
1015 state |= BMAP_RIGHT_VALID;
1016 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx + 1), &RIGHT);
1017 if (isnullstartblock(RIGHT.br_startblock))
1018 state |= BMAP_RIGHT_DELAY;
1019 }
1020
1021 if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
1022 new_endoff == RIGHT.br_startoff &&
1023 new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
1024 newext == RIGHT.br_state &&
1025 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
1026 ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
1027 BMAP_RIGHT_FILLING)) !=
1028 (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
1029 BMAP_RIGHT_FILLING) ||
1030 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
1031 <= MAXEXTLEN))
1032 state |= BMAP_RIGHT_CONTIG;
1033
1034 /*
1035 * Switch out based on the FILLING and CONTIG state bits.
1036 */
1037 switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
1038 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
1039 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
1040 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1041 /*
1042 * Setting all of a previous oldext extent to newext.
1043 * The left and right neighbors are both contiguous with new.
1044 */
1045 --*idx;
1046
1047 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1048 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
1049 LEFT.br_blockcount + PREV.br_blockcount +
1050 RIGHT.br_blockcount);
1051 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1052
1053 xfs_iext_remove(ip, *idx + 1, 2, state);
1054 ip->i_d.di_nextents -= 2;
1055 if (cur == NULL)
1056 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1057 else {
1058 rval = XFS_ILOG_CORE;
1059 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1060 RIGHT.br_startblock,
1061 RIGHT.br_blockcount, &i)))
1062 goto done;
1063 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1064 if ((error = xfs_btree_delete(cur, &i)))
1065 goto done;
1066 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1067 if ((error = xfs_btree_decrement(cur, 0, &i)))
1068 goto done;
1069 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1070 if ((error = xfs_btree_delete(cur, &i)))
1071 goto done;
1072 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1073 if ((error = xfs_btree_decrement(cur, 0, &i)))
1074 goto done;
1075 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1076 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1077 LEFT.br_startblock,
1078 LEFT.br_blockcount + PREV.br_blockcount +
1079 RIGHT.br_blockcount, LEFT.br_state)))
1080 goto done;
1081 }
1082 break;
1083
1084 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1085 /*
1086 * Setting all of a previous oldext extent to newext.
1087 * The left neighbor is contiguous, the right is not.
1088 */
1089 --*idx;
1090
1091 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1092 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
1093 LEFT.br_blockcount + PREV.br_blockcount);
1094 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1095
1096 xfs_iext_remove(ip, *idx + 1, 1, state);
1097 ip->i_d.di_nextents--;
1098 if (cur == NULL)
1099 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1100 else {
1101 rval = XFS_ILOG_CORE;
1102 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1103 PREV.br_startblock, PREV.br_blockcount,
1104 &i)))
1105 goto done;
1106 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1107 if ((error = xfs_btree_delete(cur, &i)))
1108 goto done;
1109 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1110 if ((error = xfs_btree_decrement(cur, 0, &i)))
1111 goto done;
1112 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1113 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1114 LEFT.br_startblock,
1115 LEFT.br_blockcount + PREV.br_blockcount,
1116 LEFT.br_state)))
1117 goto done;
1118 }
1119 break;
1120
1121 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1122 /*
1123 * Setting all of a previous oldext extent to newext.
1124 * The right neighbor is contiguous, the left is not.
1125 */
1126 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1127 xfs_bmbt_set_blockcount(ep,
1128 PREV.br_blockcount + RIGHT.br_blockcount);
1129 xfs_bmbt_set_state(ep, newext);
1130 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1131 xfs_iext_remove(ip, *idx + 1, 1, state);
1132 ip->i_d.di_nextents--;
1133 if (cur == NULL)
1134 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1135 else {
1136 rval = XFS_ILOG_CORE;
1137 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1138 RIGHT.br_startblock,
1139 RIGHT.br_blockcount, &i)))
1140 goto done;
1141 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1142 if ((error = xfs_btree_delete(cur, &i)))
1143 goto done;
1144 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1145 if ((error = xfs_btree_decrement(cur, 0, &i)))
1146 goto done;
1147 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1148 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1149 new->br_startblock,
1150 new->br_blockcount + RIGHT.br_blockcount,
1151 newext)))
1152 goto done;
1153 }
1154 break;
1155
1156 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
1157 /*
1158 * Setting all of a previous oldext extent to newext.
1159 * Neither the left nor right neighbors are contiguous with
1160 * the new one.
1161 */
1162 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1163 xfs_bmbt_set_state(ep, newext);
1164 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1165
1166 if (cur == NULL)
1167 rval = XFS_ILOG_DEXT;
1168 else {
1169 rval = 0;
1170 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1171 new->br_startblock, new->br_blockcount,
1172 &i)))
1173 goto done;
1174 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1175 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1176 new->br_startblock, new->br_blockcount,
1177 newext)))
1178 goto done;
1179 }
1180 break;
1181
1182 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
1183 /*
1184 * Setting the first part of a previous oldext extent to newext.
1185 * The left neighbor is contiguous.
1186 */
1187 trace_xfs_bmap_pre_update(ip, *idx - 1, state, _THIS_IP_);
1188 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx - 1),
1189 LEFT.br_blockcount + new->br_blockcount);
1190 xfs_bmbt_set_startoff(ep,
1191 PREV.br_startoff + new->br_blockcount);
1192 trace_xfs_bmap_post_update(ip, *idx - 1, state, _THIS_IP_);
1193
1194 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1195 xfs_bmbt_set_startblock(ep,
1196 new->br_startblock + new->br_blockcount);
1197 xfs_bmbt_set_blockcount(ep,
1198 PREV.br_blockcount - new->br_blockcount);
1199 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1200
1201 --*idx;
1202
1203 if (cur == NULL)
1204 rval = XFS_ILOG_DEXT;
1205 else {
1206 rval = 0;
1207 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1208 PREV.br_startblock, PREV.br_blockcount,
1209 &i)))
1210 goto done;
1211 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1212 if ((error = xfs_bmbt_update(cur,
1213 PREV.br_startoff + new->br_blockcount,
1214 PREV.br_startblock + new->br_blockcount,
1215 PREV.br_blockcount - new->br_blockcount,
1216 oldext)))
1217 goto done;
1218 if ((error = xfs_btree_decrement(cur, 0, &i)))
1219 goto done;
1220 error = xfs_bmbt_update(cur, LEFT.br_startoff,
1221 LEFT.br_startblock,
1222 LEFT.br_blockcount + new->br_blockcount,
1223 LEFT.br_state);
1224 if (error)
1225 goto done;
1226 }
1227 break;
1228
1229 case BMAP_LEFT_FILLING:
1230 /*
1231 * Setting the first part of a previous oldext extent to newext.
1232 * The left neighbor is not contiguous.
1233 */
1234 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1235 ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
1236 xfs_bmbt_set_startoff(ep, new_endoff);
1237 xfs_bmbt_set_blockcount(ep,
1238 PREV.br_blockcount - new->br_blockcount);
1239 xfs_bmbt_set_startblock(ep,
1240 new->br_startblock + new->br_blockcount);
1241 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1242
1243 xfs_iext_insert(ip, *idx, 1, new, state);
1244 ip->i_d.di_nextents++;
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, PREV.br_startoff,
1250 PREV.br_startblock, PREV.br_blockcount,
1251 &i)))
1252 goto done;
1253 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1254 if ((error = xfs_bmbt_update(cur,
1255 PREV.br_startoff + new->br_blockcount,
1256 PREV.br_startblock + new->br_blockcount,
1257 PREV.br_blockcount - new->br_blockcount,
1258 oldext)))
1259 goto done;
1260 cur->bc_rec.b = *new;
1261 if ((error = xfs_btree_insert(cur, &i)))
1262 goto done;
1263 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1264 }
1265 break;
1266
1267 case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1268 /*
1269 * Setting the last part of a previous oldext extent to newext.
1270 * The right neighbor is contiguous with the new allocation.
1271 */
1272 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1273 xfs_bmbt_set_blockcount(ep,
1274 PREV.br_blockcount - new->br_blockcount);
1275 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1276
1277 ++*idx;
1278
1279 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1280 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
1281 new->br_startoff, new->br_startblock,
1282 new->br_blockcount + RIGHT.br_blockcount, newext);
1283 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1284
1285 if (cur == NULL)
1286 rval = XFS_ILOG_DEXT;
1287 else {
1288 rval = 0;
1289 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1290 PREV.br_startblock,
1291 PREV.br_blockcount, &i)))
1292 goto done;
1293 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1294 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1295 PREV.br_startblock,
1296 PREV.br_blockcount - new->br_blockcount,
1297 oldext)))
1298 goto done;
1299 if ((error = xfs_btree_increment(cur, 0, &i)))
1300 goto done;
1301 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1302 new->br_startblock,
1303 new->br_blockcount + RIGHT.br_blockcount,
1304 newext)))
1305 goto done;
1306 }
1307 break;
1308
1309 case BMAP_RIGHT_FILLING:
1310 /*
1311 * Setting the last part of a previous oldext extent to newext.
1312 * The right neighbor is not contiguous.
1313 */
1314 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1315 xfs_bmbt_set_blockcount(ep,
1316 PREV.br_blockcount - new->br_blockcount);
1317 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1318
1319 ++*idx;
1320 xfs_iext_insert(ip, *idx, 1, new, state);
1321
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, PREV.br_startoff,
1328 PREV.br_startblock, PREV.br_blockcount,
1329 &i)))
1330 goto done;
1331 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1332 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1333 PREV.br_startblock,
1334 PREV.br_blockcount - new->br_blockcount,
1335 oldext)))
1336 goto done;
1337 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1338 new->br_startblock, new->br_blockcount,
1339 &i)))
1340 goto done;
1341 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1342 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1343 if ((error = xfs_btree_insert(cur, &i)))
1344 goto done;
1345 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1346 }
1347 break;
1348
1349 case 0:
1350 /*
1351 * Setting the middle part of a previous oldext extent to
1352 * newext. Contiguity is impossible here.
1353 * One extent becomes three extents.
1354 */
1355 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1356 xfs_bmbt_set_blockcount(ep,
1357 new->br_startoff - PREV.br_startoff);
1358 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1359
1360 r[0] = *new;
1361 r[1].br_startoff = new_endoff;
1362 r[1].br_blockcount =
1363 PREV.br_startoff + PREV.br_blockcount - new_endoff;
1364 r[1].br_startblock = new->br_startblock + new->br_blockcount;
1365 r[1].br_state = oldext;
1366
1367 ++*idx;
1368 xfs_iext_insert(ip, *idx, 2, &r[0], state);
1369
1370 ip->i_d.di_nextents += 2;
1371 if (cur == NULL)
1372 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1373 else {
1374 rval = XFS_ILOG_CORE;
1375 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1376 PREV.br_startblock, PREV.br_blockcount,
1377 &i)))
1378 goto done;
1379 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1380 /* new right extent - oldext */
1381 if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
1382 r[1].br_startblock, r[1].br_blockcount,
1383 r[1].br_state)))
1384 goto done;
1385 /* new left extent - oldext */
1386 cur->bc_rec.b = PREV;
1387 cur->bc_rec.b.br_blockcount =
1388 new->br_startoff - PREV.br_startoff;
1389 if ((error = xfs_btree_insert(cur, &i)))
1390 goto done;
1391 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1392 /*
1393 * Reset the cursor to the position of the new extent
1394 * we are about to insert as we can't trust it after
1395 * the previous insert.
1396 */
1397 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1398 new->br_startblock, new->br_blockcount,
1399 &i)))
1400 goto done;
1401 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1402 /* new middle extent - newext */
1403 cur->bc_rec.b.br_state = new->br_state;
1404 if ((error = xfs_btree_insert(cur, &i)))
1405 goto done;
1406 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1407 }
1408 break;
1409
1410 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1411 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1412 case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
1413 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1414 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1415 case BMAP_LEFT_CONTIG:
1416 case BMAP_RIGHT_CONTIG:
1417 /*
1418 * These cases are all impossible.
1419 */
1420 ASSERT(0);
1421 }
1422
1423 /* convert to a btree if necessary */
1424 if (XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) == XFS_DINODE_FMT_EXTENTS &&
1425 XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) > ifp->if_ext_max) {
1426 int tmp_logflags; /* partial log flag return val */
1427
1428 ASSERT(cur == NULL);
1429 error = xfs_bmap_extents_to_btree(tp, ip, first, flist, &cur,
1430 0, &tmp_logflags, XFS_DATA_FORK);
1431 *logflagsp |= tmp_logflags;
1432 if (error)
1433 goto done;
1434 }
1435
1436 /* clear out the allocated field, done with it now in any case. */
1437 if (cur) {
1438 cur->bc_private.b.allocated = 0;
1439 *curp = cur;
1440 }
1441
1442 xfs_bmap_check_leaf_extents(*curp, ip, XFS_DATA_FORK);
1443 done:
1444 *logflagsp |= rval;
1445 return error;
1446 #undef LEFT
1447 #undef RIGHT
1448 #undef PREV
1449 }
1450
1451 /*
1452 * Convert a hole to a delayed allocation.
1453 */
1454 STATIC void
1455 xfs_bmap_add_extent_hole_delay(
1456 xfs_inode_t *ip, /* incore inode pointer */
1457 xfs_extnum_t *idx, /* extent number to update/insert */
1458 xfs_bmbt_irec_t *new) /* new data to add to file extents */
1459 {
1460 xfs_ifork_t *ifp; /* inode fork pointer */
1461 xfs_bmbt_irec_t left; /* left neighbor extent entry */
1462 xfs_filblks_t newlen=0; /* new indirect size */
1463 xfs_filblks_t oldlen=0; /* old indirect size */
1464 xfs_bmbt_irec_t right; /* right neighbor extent entry */
1465 int state; /* state bits, accessed thru macros */
1466 xfs_filblks_t temp=0; /* temp for indirect calculations */
1467
1468 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1469 state = 0;
1470 ASSERT(isnullstartblock(new->br_startblock));
1471
1472 /*
1473 * Check and set flags if this segment has a left neighbor
1474 */
1475 if (*idx > 0) {
1476 state |= BMAP_LEFT_VALID;
1477 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &left);
1478
1479 if (isnullstartblock(left.br_startblock))
1480 state |= BMAP_LEFT_DELAY;
1481 }
1482
1483 /*
1484 * Check and set flags if the current (right) segment exists.
1485 * If it doesn't exist, we're converting the hole at end-of-file.
1486 */
1487 if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
1488 state |= BMAP_RIGHT_VALID;
1489 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right);
1490
1491 if (isnullstartblock(right.br_startblock))
1492 state |= BMAP_RIGHT_DELAY;
1493 }
1494
1495 /*
1496 * Set contiguity flags on the left and right neighbors.
1497 * Don't let extents get too large, even if the pieces are contiguous.
1498 */
1499 if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) &&
1500 left.br_startoff + left.br_blockcount == new->br_startoff &&
1501 left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1502 state |= BMAP_LEFT_CONTIG;
1503
1504 if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) &&
1505 new->br_startoff + new->br_blockcount == right.br_startoff &&
1506 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
1507 (!(state & BMAP_LEFT_CONTIG) ||
1508 (left.br_blockcount + new->br_blockcount +
1509 right.br_blockcount <= MAXEXTLEN)))
1510 state |= BMAP_RIGHT_CONTIG;
1511
1512 /*
1513 * Switch out based on the contiguity flags.
1514 */
1515 switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
1516 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1517 /*
1518 * New allocation is contiguous with delayed allocations
1519 * on the left and on the right.
1520 * Merge all three into a single extent record.
1521 */
1522 --*idx;
1523 temp = left.br_blockcount + new->br_blockcount +
1524 right.br_blockcount;
1525
1526 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1527 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
1528 oldlen = startblockval(left.br_startblock) +
1529 startblockval(new->br_startblock) +
1530 startblockval(right.br_startblock);
1531 newlen = xfs_bmap_worst_indlen(ip, temp);
1532 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
1533 nullstartblock((int)newlen));
1534 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1535
1536 xfs_iext_remove(ip, *idx + 1, 1, state);
1537 break;
1538
1539 case BMAP_LEFT_CONTIG:
1540 /*
1541 * New allocation is contiguous with a delayed allocation
1542 * on the left.
1543 * Merge the new allocation with the left neighbor.
1544 */
1545 --*idx;
1546 temp = left.br_blockcount + new->br_blockcount;
1547
1548 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1549 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
1550 oldlen = startblockval(left.br_startblock) +
1551 startblockval(new->br_startblock);
1552 newlen = xfs_bmap_worst_indlen(ip, temp);
1553 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
1554 nullstartblock((int)newlen));
1555 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1556 break;
1557
1558 case BMAP_RIGHT_CONTIG:
1559 /*
1560 * New allocation is contiguous with a delayed allocation
1561 * on the right.
1562 * Merge the new allocation with the right neighbor.
1563 */
1564 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1565 temp = new->br_blockcount + right.br_blockcount;
1566 oldlen = startblockval(new->br_startblock) +
1567 startblockval(right.br_startblock);
1568 newlen = xfs_bmap_worst_indlen(ip, temp);
1569 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
1570 new->br_startoff,
1571 nullstartblock((int)newlen), temp, right.br_state);
1572 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1573 break;
1574
1575 case 0:
1576 /*
1577 * New allocation is not contiguous with another
1578 * delayed allocation.
1579 * Insert a new entry.
1580 */
1581 oldlen = newlen = 0;
1582 xfs_iext_insert(ip, *idx, 1, new, state);
1583 break;
1584 }
1585 if (oldlen != newlen) {
1586 ASSERT(oldlen > newlen);
1587 xfs_icsb_modify_counters(ip->i_mount, XFS_SBS_FDBLOCKS,
1588 (int64_t)(oldlen - newlen), 0);
1589 /*
1590 * Nothing to do for disk quota accounting here.
1591 */
1592 }
1593 }
1594
1595 /*
1596 * Convert a hole to a real allocation.
1597 */
1598 STATIC int /* error */
1599 xfs_bmap_add_extent_hole_real(
1600 struct xfs_bmalloca *bma,
1601 int whichfork)
1602 {
1603 struct xfs_bmbt_irec *new = &bma->got;
1604 int error; /* error return value */
1605 int i; /* temp state */
1606 xfs_ifork_t *ifp; /* inode fork pointer */
1607 xfs_bmbt_irec_t left; /* left neighbor extent entry */
1608 xfs_bmbt_irec_t right; /* right neighbor extent entry */
1609 int rval=0; /* return value (logging flags) */
1610 int state; /* state bits, accessed thru macros */
1611
1612 ifp = XFS_IFORK_PTR(bma->ip, whichfork);
1613
1614 ASSERT(bma->idx >= 0);
1615 ASSERT(bma->idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
1616 ASSERT(!isnullstartblock(new->br_startblock));
1617 ASSERT(!bma->cur ||
1618 !(bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
1619
1620 XFS_STATS_INC(xs_add_exlist);
1621
1622 state = 0;
1623 if (whichfork == XFS_ATTR_FORK)
1624 state |= BMAP_ATTRFORK;
1625
1626 /*
1627 * Check and set flags if this segment has a left neighbor.
1628 */
1629 if (bma->idx > 0) {
1630 state |= BMAP_LEFT_VALID;
1631 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), &left);
1632 if (isnullstartblock(left.br_startblock))
1633 state |= BMAP_LEFT_DELAY;
1634 }
1635
1636 /*
1637 * Check and set flags if this segment has a current value.
1638 * Not true if we're inserting into the "hole" at eof.
1639 */
1640 if (bma->idx < ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
1641 state |= BMAP_RIGHT_VALID;
1642 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &right);
1643 if (isnullstartblock(right.br_startblock))
1644 state |= BMAP_RIGHT_DELAY;
1645 }
1646
1647 /*
1648 * We're inserting a real allocation between "left" and "right".
1649 * Set the contiguity flags. Don't let extents get too large.
1650 */
1651 if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
1652 left.br_startoff + left.br_blockcount == new->br_startoff &&
1653 left.br_startblock + left.br_blockcount == new->br_startblock &&
1654 left.br_state == new->br_state &&
1655 left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1656 state |= BMAP_LEFT_CONTIG;
1657
1658 if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
1659 new->br_startoff + new->br_blockcount == right.br_startoff &&
1660 new->br_startblock + new->br_blockcount == right.br_startblock &&
1661 new->br_state == right.br_state &&
1662 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
1663 (!(state & BMAP_LEFT_CONTIG) ||
1664 left.br_blockcount + new->br_blockcount +
1665 right.br_blockcount <= MAXEXTLEN))
1666 state |= BMAP_RIGHT_CONTIG;
1667
1668 error = 0;
1669 /*
1670 * Select which case we're in here, and implement it.
1671 */
1672 switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
1673 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1674 /*
1675 * New allocation is contiguous with real allocations on the
1676 * left and on the right.
1677 * Merge all three into a single extent record.
1678 */
1679 --bma->idx;
1680 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1681 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
1682 left.br_blockcount + new->br_blockcount +
1683 right.br_blockcount);
1684 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1685
1686 xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
1687
1688 XFS_IFORK_NEXT_SET(bma->ip, whichfork,
1689 XFS_IFORK_NEXTENTS(bma->ip, whichfork) - 1);
1690 if (bma->cur == NULL) {
1691 rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
1692 } else {
1693 rval = XFS_ILOG_CORE;
1694 error = xfs_bmbt_lookup_eq(bma->cur, right.br_startoff,
1695 right.br_startblock, right.br_blockcount,
1696 &i);
1697 if (error)
1698 goto done;
1699 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1700 error = xfs_btree_delete(bma->cur, &i);
1701 if (error)
1702 goto done;
1703 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1704 error = xfs_btree_decrement(bma->cur, 0, &i);
1705 if (error)
1706 goto done;
1707 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1708 error = xfs_bmbt_update(bma->cur, left.br_startoff,
1709 left.br_startblock,
1710 left.br_blockcount +
1711 new->br_blockcount +
1712 right.br_blockcount,
1713 left.br_state);
1714 if (error)
1715 goto done;
1716 }
1717 break;
1718
1719 case BMAP_LEFT_CONTIG:
1720 /*
1721 * New allocation is contiguous with a real allocation
1722 * on the left.
1723 * Merge the new allocation with the left neighbor.
1724 */
1725 --bma->idx;
1726 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1727 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
1728 left.br_blockcount + new->br_blockcount);
1729 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1730
1731 if (bma->cur == NULL) {
1732 rval = xfs_ilog_fext(whichfork);
1733 } else {
1734 rval = 0;
1735 error = xfs_bmbt_lookup_eq(bma->cur, left.br_startoff,
1736 left.br_startblock, left.br_blockcount,
1737 &i);
1738 if (error)
1739 goto done;
1740 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1741 error = xfs_bmbt_update(bma->cur, left.br_startoff,
1742 left.br_startblock,
1743 left.br_blockcount +
1744 new->br_blockcount,
1745 left.br_state);
1746 if (error)
1747 goto done;
1748 }
1749 break;
1750
1751 case BMAP_RIGHT_CONTIG:
1752 /*
1753 * New allocation is contiguous with a real allocation
1754 * on the right.
1755 * Merge the new allocation with the right neighbor.
1756 */
1757 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1758 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx),
1759 new->br_startoff, new->br_startblock,
1760 new->br_blockcount + right.br_blockcount,
1761 right.br_state);
1762 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1763
1764 if (bma->cur == NULL) {
1765 rval = xfs_ilog_fext(whichfork);
1766 } else {
1767 rval = 0;
1768 error = xfs_bmbt_lookup_eq(bma->cur,
1769 right.br_startoff,
1770 right.br_startblock,
1771 right.br_blockcount, &i);
1772 if (error)
1773 goto done;
1774 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1775 error = xfs_bmbt_update(bma->cur, new->br_startoff,
1776 new->br_startblock,
1777 new->br_blockcount +
1778 right.br_blockcount,
1779 right.br_state);
1780 if (error)
1781 goto done;
1782 }
1783 break;
1784
1785 case 0:
1786 /*
1787 * New allocation is not contiguous with another
1788 * real allocation.
1789 * Insert a new entry.
1790 */
1791 xfs_iext_insert(bma->ip, bma->idx, 1, new, state);
1792 XFS_IFORK_NEXT_SET(bma->ip, whichfork,
1793 XFS_IFORK_NEXTENTS(bma->ip, whichfork) + 1);
1794 if (bma->cur == NULL) {
1795 rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
1796 } else {
1797 rval = XFS_ILOG_CORE;
1798 error = xfs_bmbt_lookup_eq(bma->cur,
1799 new->br_startoff,
1800 new->br_startblock,
1801 new->br_blockcount, &i);
1802 if (error)
1803 goto done;
1804 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1805 bma->cur->bc_rec.b.br_state = new->br_state;
1806 error = xfs_btree_insert(bma->cur, &i);
1807 if (error)
1808 goto done;
1809 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1810 }
1811 break;
1812 }
1813
1814 /* convert to a btree if necessary */
1815 if (XFS_IFORK_FORMAT(bma->ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
1816 XFS_IFORK_NEXTENTS(bma->ip, whichfork) > ifp->if_ext_max) {
1817 int tmp_logflags; /* partial log flag return val */
1818
1819 ASSERT(bma->cur == NULL);
1820 error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
1821 bma->firstblock, bma->flist, &bma->cur,
1822 0, &tmp_logflags, whichfork);
1823 bma->logflags |= tmp_logflags;
1824 if (error)
1825 goto done;
1826 }
1827
1828 /* clear out the allocated field, done with it now in any case. */
1829 if (bma->cur)
1830 bma->cur->bc_private.b.allocated = 0;
1831
1832 xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork);
1833 done:
1834 bma->logflags |= rval;
1835 return error;
1836 }
1837
1838 /*
1839 * Adjust the size of the new extent based on di_extsize and rt extsize.
1840 */
1841 STATIC int
1842 xfs_bmap_extsize_align(
1843 xfs_mount_t *mp,
1844 xfs_bmbt_irec_t *gotp, /* next extent pointer */
1845 xfs_bmbt_irec_t *prevp, /* previous extent pointer */
1846 xfs_extlen_t extsz, /* align to this extent size */
1847 int rt, /* is this a realtime inode? */
1848 int eof, /* is extent at end-of-file? */
1849 int delay, /* creating delalloc extent? */
1850 int convert, /* overwriting unwritten extent? */
1851 xfs_fileoff_t *offp, /* in/out: aligned offset */
1852 xfs_extlen_t *lenp) /* in/out: aligned length */
1853 {
1854 xfs_fileoff_t orig_off; /* original offset */
1855 xfs_extlen_t orig_alen; /* original length */
1856 xfs_fileoff_t orig_end; /* original off+len */
1857 xfs_fileoff_t nexto; /* next file offset */
1858 xfs_fileoff_t prevo; /* previous file offset */
1859 xfs_fileoff_t align_off; /* temp for offset */
1860 xfs_extlen_t align_alen; /* temp for length */
1861 xfs_extlen_t temp; /* temp for calculations */
1862
1863 if (convert)
1864 return 0;
1865
1866 orig_off = align_off = *offp;
1867 orig_alen = align_alen = *lenp;
1868 orig_end = orig_off + orig_alen;
1869
1870 /*
1871 * If this request overlaps an existing extent, then don't
1872 * attempt to perform any additional alignment.
1873 */
1874 if (!delay && !eof &&
1875 (orig_off >= gotp->br_startoff) &&
1876 (orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
1877 return 0;
1878 }
1879
1880 /*
1881 * If the file offset is unaligned vs. the extent size
1882 * we need to align it. This will be possible unless
1883 * the file was previously written with a kernel that didn't
1884 * perform this alignment, or if a truncate shot us in the
1885 * foot.
1886 */
1887 temp = do_mod(orig_off, extsz);
1888 if (temp) {
1889 align_alen += temp;
1890 align_off -= temp;
1891 }
1892 /*
1893 * Same adjustment for the end of the requested area.
1894 */
1895 if ((temp = (align_alen % extsz))) {
1896 align_alen += extsz - temp;
1897 }
1898 /*
1899 * If the previous block overlaps with this proposed allocation
1900 * then move the start forward without adjusting the length.
1901 */
1902 if (prevp->br_startoff != NULLFILEOFF) {
1903 if (prevp->br_startblock == HOLESTARTBLOCK)
1904 prevo = prevp->br_startoff;
1905 else
1906 prevo = prevp->br_startoff + prevp->br_blockcount;
1907 } else
1908 prevo = 0;
1909 if (align_off != orig_off && align_off < prevo)
1910 align_off = prevo;
1911 /*
1912 * If the next block overlaps with this proposed allocation
1913 * then move the start back without adjusting the length,
1914 * but not before offset 0.
1915 * This may of course make the start overlap previous block,
1916 * and if we hit the offset 0 limit then the next block
1917 * can still overlap too.
1918 */
1919 if (!eof && gotp->br_startoff != NULLFILEOFF) {
1920 if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
1921 (!delay && gotp->br_startblock == DELAYSTARTBLOCK))
1922 nexto = gotp->br_startoff + gotp->br_blockcount;
1923 else
1924 nexto = gotp->br_startoff;
1925 } else
1926 nexto = NULLFILEOFF;
1927 if (!eof &&
1928 align_off + align_alen != orig_end &&
1929 align_off + align_alen > nexto)
1930 align_off = nexto > align_alen ? nexto - align_alen : 0;
1931 /*
1932 * If we're now overlapping the next or previous extent that
1933 * means we can't fit an extsz piece in this hole. Just move
1934 * the start forward to the first valid spot and set
1935 * the length so we hit the end.
1936 */
1937 if (align_off != orig_off && align_off < prevo)
1938 align_off = prevo;
1939 if (align_off + align_alen != orig_end &&
1940 align_off + align_alen > nexto &&
1941 nexto != NULLFILEOFF) {
1942 ASSERT(nexto > prevo);
1943 align_alen = nexto - align_off;
1944 }
1945
1946 /*
1947 * If realtime, and the result isn't a multiple of the realtime
1948 * extent size we need to remove blocks until it is.
1949 */
1950 if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
1951 /*
1952 * We're not covering the original request, or
1953 * we won't be able to once we fix the length.
1954 */
1955 if (orig_off < align_off ||
1956 orig_end > align_off + align_alen ||
1957 align_alen - temp < orig_alen)
1958 return XFS_ERROR(EINVAL);
1959 /*
1960 * Try to fix it by moving the start up.
1961 */
1962 if (align_off + temp <= orig_off) {
1963 align_alen -= temp;
1964 align_off += temp;
1965 }
1966 /*
1967 * Try to fix it by moving the end in.
1968 */
1969 else if (align_off + align_alen - temp >= orig_end)
1970 align_alen -= temp;
1971 /*
1972 * Set the start to the minimum then trim the length.
1973 */
1974 else {
1975 align_alen -= orig_off - align_off;
1976 align_off = orig_off;
1977 align_alen -= align_alen % mp->m_sb.sb_rextsize;
1978 }
1979 /*
1980 * Result doesn't cover the request, fail it.
1981 */
1982 if (orig_off < align_off || orig_end > align_off + align_alen)
1983 return XFS_ERROR(EINVAL);
1984 } else {
1985 ASSERT(orig_off >= align_off);
1986 ASSERT(orig_end <= align_off + align_alen);
1987 }
1988
1989 #ifdef DEBUG
1990 if (!eof && gotp->br_startoff != NULLFILEOFF)
1991 ASSERT(align_off + align_alen <= gotp->br_startoff);
1992 if (prevp->br_startoff != NULLFILEOFF)
1993 ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
1994 #endif
1995
1996 *lenp = align_alen;
1997 *offp = align_off;
1998 return 0;
1999 }
2000
2001 #define XFS_ALLOC_GAP_UNITS 4
2002
2003 STATIC void
2004 xfs_bmap_adjacent(
2005 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2006 {
2007 xfs_fsblock_t adjust; /* adjustment to block numbers */
2008 xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
2009 xfs_mount_t *mp; /* mount point structure */
2010 int nullfb; /* true if ap->firstblock isn't set */
2011 int rt; /* true if inode is realtime */
2012
2013 #define ISVALID(x,y) \
2014 (rt ? \
2015 (x) < mp->m_sb.sb_rblocks : \
2016 XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
2017 XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
2018 XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
2019
2020 mp = ap->ip->i_mount;
2021 nullfb = *ap->firstblock == NULLFSBLOCK;
2022 rt = XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata;
2023 fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, *ap->firstblock);
2024 /*
2025 * If allocating at eof, and there's a previous real block,
2026 * try to use its last block as our starting point.
2027 */
2028 if (ap->eof && ap->prev.br_startoff != NULLFILEOFF &&
2029 !isnullstartblock(ap->prev.br_startblock) &&
2030 ISVALID(ap->prev.br_startblock + ap->prev.br_blockcount,
2031 ap->prev.br_startblock)) {
2032 ap->blkno = ap->prev.br_startblock + ap->prev.br_blockcount;
2033 /*
2034 * Adjust for the gap between prevp and us.
2035 */
2036 adjust = ap->offset -
2037 (ap->prev.br_startoff + ap->prev.br_blockcount);
2038 if (adjust &&
2039 ISVALID(ap->blkno + adjust, ap->prev.br_startblock))
2040 ap->blkno += adjust;
2041 }
2042 /*
2043 * If not at eof, then compare the two neighbor blocks.
2044 * Figure out whether either one gives us a good starting point,
2045 * and pick the better one.
2046 */
2047 else if (!ap->eof) {
2048 xfs_fsblock_t gotbno; /* right side block number */
2049 xfs_fsblock_t gotdiff=0; /* right side difference */
2050 xfs_fsblock_t prevbno; /* left side block number */
2051 xfs_fsblock_t prevdiff=0; /* left side difference */
2052
2053 /*
2054 * If there's a previous (left) block, select a requested
2055 * start block based on it.
2056 */
2057 if (ap->prev.br_startoff != NULLFILEOFF &&
2058 !isnullstartblock(ap->prev.br_startblock) &&
2059 (prevbno = ap->prev.br_startblock +
2060 ap->prev.br_blockcount) &&
2061 ISVALID(prevbno, ap->prev.br_startblock)) {
2062 /*
2063 * Calculate gap to end of previous block.
2064 */
2065 adjust = prevdiff = ap->offset -
2066 (ap->prev.br_startoff +
2067 ap->prev.br_blockcount);
2068 /*
2069 * Figure the startblock based on the previous block's
2070 * end and the gap size.
2071 * Heuristic!
2072 * If the gap is large relative to the piece we're
2073 * allocating, or using it gives us an invalid block
2074 * number, then just use the end of the previous block.
2075 */
2076 if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
2077 ISVALID(prevbno + prevdiff,
2078 ap->prev.br_startblock))
2079 prevbno += adjust;
2080 else
2081 prevdiff += adjust;
2082 /*
2083 * If the firstblock forbids it, can't use it,
2084 * must use default.
2085 */
2086 if (!rt && !nullfb &&
2087 XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
2088 prevbno = NULLFSBLOCK;
2089 }
2090 /*
2091 * No previous block or can't follow it, just default.
2092 */
2093 else
2094 prevbno = NULLFSBLOCK;
2095 /*
2096 * If there's a following (right) block, select a requested
2097 * start block based on it.
2098 */
2099 if (!isnullstartblock(ap->got.br_startblock)) {
2100 /*
2101 * Calculate gap to start of next block.
2102 */
2103 adjust = gotdiff = ap->got.br_startoff - ap->offset;
2104 /*
2105 * Figure the startblock based on the next block's
2106 * start and the gap size.
2107 */
2108 gotbno = ap->got.br_startblock;
2109 /*
2110 * Heuristic!
2111 * If the gap is large relative to the piece we're
2112 * allocating, or using it gives us an invalid block
2113 * number, then just use the start of the next block
2114 * offset by our length.
2115 */
2116 if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
2117 ISVALID(gotbno - gotdiff, gotbno))
2118 gotbno -= adjust;
2119 else if (ISVALID(gotbno - ap->length, gotbno)) {
2120 gotbno -= ap->length;
2121 gotdiff += adjust - ap->length;
2122 } else
2123 gotdiff += adjust;
2124 /*
2125 * If the firstblock forbids it, can't use it,
2126 * must use default.
2127 */
2128 if (!rt && !nullfb &&
2129 XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
2130 gotbno = NULLFSBLOCK;
2131 }
2132 /*
2133 * No next block, just default.
2134 */
2135 else
2136 gotbno = NULLFSBLOCK;
2137 /*
2138 * If both valid, pick the better one, else the only good
2139 * one, else ap->blkno is already set (to 0 or the inode block).
2140 */
2141 if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
2142 ap->blkno = prevdiff <= gotdiff ? prevbno : gotbno;
2143 else if (prevbno != NULLFSBLOCK)
2144 ap->blkno = prevbno;
2145 else if (gotbno != NULLFSBLOCK)
2146 ap->blkno = gotbno;
2147 }
2148 #undef ISVALID
2149 }
2150
2151 STATIC int
2152 xfs_bmap_rtalloc(
2153 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2154 {
2155 xfs_alloctype_t atype = 0; /* type for allocation routines */
2156 int error; /* error return value */
2157 xfs_mount_t *mp; /* mount point structure */
2158 xfs_extlen_t prod = 0; /* product factor for allocators */
2159 xfs_extlen_t ralen = 0; /* realtime allocation length */
2160 xfs_extlen_t align; /* minimum allocation alignment */
2161 xfs_rtblock_t rtb;
2162
2163 mp = ap->ip->i_mount;
2164 align = xfs_get_extsz_hint(ap->ip);
2165 prod = align / mp->m_sb.sb_rextsize;
2166 error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
2167 align, 1, ap->eof, 0,
2168 ap->conv, &ap->offset, &ap->length);
2169 if (error)
2170 return error;
2171 ASSERT(ap->length);
2172 ASSERT(ap->length % mp->m_sb.sb_rextsize == 0);
2173
2174 /*
2175 * If the offset & length are not perfectly aligned
2176 * then kill prod, it will just get us in trouble.
2177 */
2178 if (do_mod(ap->offset, align) || ap->length % align)
2179 prod = 1;
2180 /*
2181 * Set ralen to be the actual requested length in rtextents.
2182 */
2183 ralen = ap->length / mp->m_sb.sb_rextsize;
2184 /*
2185 * If the old value was close enough to MAXEXTLEN that
2186 * we rounded up to it, cut it back so it's valid again.
2187 * Note that if it's a really large request (bigger than
2188 * MAXEXTLEN), we don't hear about that number, and can't
2189 * adjust the starting point to match it.
2190 */
2191 if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
2192 ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
2193
2194 /*
2195 * Lock out other modifications to the RT bitmap inode.
2196 */
2197 xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
2198 xfs_trans_ijoin(ap->tp, mp->m_rbmip, XFS_ILOCK_EXCL);
2199
2200 /*
2201 * If it's an allocation to an empty file at offset 0,
2202 * pick an extent that will space things out in the rt area.
2203 */
2204 if (ap->eof && ap->offset == 0) {
2205 xfs_rtblock_t uninitialized_var(rtx); /* realtime extent no */
2206
2207 error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
2208 if (error)
2209 return error;
2210 ap->blkno = rtx * mp->m_sb.sb_rextsize;
2211 } else {
2212 ap->blkno = 0;
2213 }
2214
2215 xfs_bmap_adjacent(ap);
2216
2217 /*
2218 * Realtime allocation, done through xfs_rtallocate_extent.
2219 */
2220 atype = ap->blkno == 0 ? XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
2221 do_div(ap->blkno, mp->m_sb.sb_rextsize);
2222 rtb = ap->blkno;
2223 ap->length = ralen;
2224 if ((error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1, ap->length,
2225 &ralen, atype, ap->wasdel, prod, &rtb)))
2226 return error;
2227 if (rtb == NULLFSBLOCK && prod > 1 &&
2228 (error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1,
2229 ap->length, &ralen, atype,
2230 ap->wasdel, 1, &rtb)))
2231 return error;
2232 ap->blkno = rtb;
2233 if (ap->blkno != NULLFSBLOCK) {
2234 ap->blkno *= mp->m_sb.sb_rextsize;
2235 ralen *= mp->m_sb.sb_rextsize;
2236 ap->length = ralen;
2237 ap->ip->i_d.di_nblocks += ralen;
2238 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2239 if (ap->wasdel)
2240 ap->ip->i_delayed_blks -= ralen;
2241 /*
2242 * Adjust the disk quota also. This was reserved
2243 * earlier.
2244 */
2245 xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
2246 ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
2247 XFS_TRANS_DQ_RTBCOUNT, (long) ralen);
2248 } else {
2249 ap->length = 0;
2250 }
2251 return 0;
2252 }
2253
2254 STATIC int
2255 xfs_bmap_btalloc_nullfb(
2256 struct xfs_bmalloca *ap,
2257 struct xfs_alloc_arg *args,
2258 xfs_extlen_t *blen)
2259 {
2260 struct xfs_mount *mp = ap->ip->i_mount;
2261 struct xfs_perag *pag;
2262 xfs_agnumber_t ag, startag;
2263 int notinit = 0;
2264 int error;
2265
2266 if (ap->userdata && xfs_inode_is_filestream(ap->ip))
2267 args->type = XFS_ALLOCTYPE_NEAR_BNO;
2268 else
2269 args->type = XFS_ALLOCTYPE_START_BNO;
2270 args->total = ap->total;
2271
2272 /*
2273 * Search for an allocation group with a single extent large enough
2274 * for the request. If one isn't found, then adjust the minimum
2275 * allocation size to the largest space found.
2276 */
2277 startag = ag = XFS_FSB_TO_AGNO(mp, args->fsbno);
2278 if (startag == NULLAGNUMBER)
2279 startag = ag = 0;
2280
2281 pag = xfs_perag_get(mp, ag);
2282 while (*blen < args->maxlen) {
2283 if (!pag->pagf_init) {
2284 error = xfs_alloc_pagf_init(mp, args->tp, ag,
2285 XFS_ALLOC_FLAG_TRYLOCK);
2286 if (error) {
2287 xfs_perag_put(pag);
2288 return error;
2289 }
2290 }
2291
2292 /*
2293 * See xfs_alloc_fix_freelist...
2294 */
2295 if (pag->pagf_init) {
2296 xfs_extlen_t longest;
2297 longest = xfs_alloc_longest_free_extent(mp, pag);
2298 if (*blen < longest)
2299 *blen = longest;
2300 } else
2301 notinit = 1;
2302
2303 if (xfs_inode_is_filestream(ap->ip)) {
2304 if (*blen >= args->maxlen)
2305 break;
2306
2307 if (ap->userdata) {
2308 /*
2309 * If startag is an invalid AG, we've
2310 * come here once before and
2311 * xfs_filestream_new_ag picked the
2312 * best currently available.
2313 *
2314 * Don't continue looping, since we
2315 * could loop forever.
2316 */
2317 if (startag == NULLAGNUMBER)
2318 break;
2319
2320 error = xfs_filestream_new_ag(ap, &ag);
2321 xfs_perag_put(pag);
2322 if (error)
2323 return error;
2324
2325 /* loop again to set 'blen'*/
2326 startag = NULLAGNUMBER;
2327 pag = xfs_perag_get(mp, ag);
2328 continue;
2329 }
2330 }
2331 if (++ag == mp->m_sb.sb_agcount)
2332 ag = 0;
2333 if (ag == startag)
2334 break;
2335 xfs_perag_put(pag);
2336 pag = xfs_perag_get(mp, ag);
2337 }
2338 xfs_perag_put(pag);
2339
2340 /*
2341 * Since the above loop did a BUF_TRYLOCK, it is
2342 * possible that there is space for this request.
2343 */
2344 if (notinit || *blen < ap->minlen)
2345 args->minlen = ap->minlen;
2346 /*
2347 * If the best seen length is less than the request
2348 * length, use the best as the minimum.
2349 */
2350 else if (*blen < args->maxlen)
2351 args->minlen = *blen;
2352 /*
2353 * Otherwise we've seen an extent as big as maxlen,
2354 * use that as the minimum.
2355 */
2356 else
2357 args->minlen = args->maxlen;
2358
2359 /*
2360 * set the failure fallback case to look in the selected
2361 * AG as the stream may have moved.
2362 */
2363 if (xfs_inode_is_filestream(ap->ip))
2364 ap->blkno = args->fsbno = XFS_AGB_TO_FSB(mp, ag, 0);
2365
2366 return 0;
2367 }
2368
2369 STATIC int
2370 xfs_bmap_btalloc(
2371 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2372 {
2373 xfs_mount_t *mp; /* mount point structure */
2374 xfs_alloctype_t atype = 0; /* type for allocation routines */
2375 xfs_extlen_t align; /* minimum allocation alignment */
2376 xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
2377 xfs_agnumber_t ag;
2378 xfs_alloc_arg_t args;
2379 xfs_extlen_t blen;
2380 xfs_extlen_t nextminlen = 0;
2381 int nullfb; /* true if ap->firstblock isn't set */
2382 int isaligned;
2383 int tryagain;
2384 int error;
2385
2386 ASSERT(ap->length);
2387
2388 mp = ap->ip->i_mount;
2389 align = ap->userdata ? xfs_get_extsz_hint(ap->ip) : 0;
2390 if (unlikely(align)) {
2391 error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
2392 align, 0, ap->eof, 0, ap->conv,
2393 &ap->offset, &ap->length);
2394 ASSERT(!error);
2395 ASSERT(ap->length);
2396 }
2397 nullfb = *ap->firstblock == NULLFSBLOCK;
2398 fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, *ap->firstblock);
2399 if (nullfb) {
2400 if (ap->userdata && xfs_inode_is_filestream(ap->ip)) {
2401 ag = xfs_filestream_lookup_ag(ap->ip);
2402 ag = (ag != NULLAGNUMBER) ? ag : 0;
2403 ap->blkno = XFS_AGB_TO_FSB(mp, ag, 0);
2404 } else {
2405 ap->blkno = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
2406 }
2407 } else
2408 ap->blkno = *ap->firstblock;
2409
2410 xfs_bmap_adjacent(ap);
2411
2412 /*
2413 * If allowed, use ap->blkno; otherwise must use firstblock since
2414 * it's in the right allocation group.
2415 */
2416 if (nullfb || XFS_FSB_TO_AGNO(mp, ap->blkno) == fb_agno)
2417 ;
2418 else
2419 ap->blkno = *ap->firstblock;
2420 /*
2421 * Normal allocation, done through xfs_alloc_vextent.
2422 */
2423 tryagain = isaligned = 0;
2424 args.tp = ap->tp;
2425 args.mp = mp;
2426 args.fsbno = ap->blkno;
2427
2428 /* Trim the allocation back to the maximum an AG can fit. */
2429 args.maxlen = MIN(ap->length, XFS_ALLOC_AG_MAX_USABLE(mp));
2430 args.firstblock = *ap->firstblock;
2431 blen = 0;
2432 if (nullfb) {
2433 error = xfs_bmap_btalloc_nullfb(ap, &args, &blen);
2434 if (error)
2435 return error;
2436 } else if (ap->flist->xbf_low) {
2437 if (xfs_inode_is_filestream(ap->ip))
2438 args.type = XFS_ALLOCTYPE_FIRST_AG;
2439 else
2440 args.type = XFS_ALLOCTYPE_START_BNO;
2441 args.total = args.minlen = ap->minlen;
2442 } else {
2443 args.type = XFS_ALLOCTYPE_NEAR_BNO;
2444 args.total = ap->total;
2445 args.minlen = ap->minlen;
2446 }
2447 /* apply extent size hints if obtained earlier */
2448 if (unlikely(align)) {
2449 args.prod = align;
2450 if ((args.mod = (xfs_extlen_t)do_mod(ap->offset, args.prod)))
2451 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2452 } else if (mp->m_sb.sb_blocksize >= PAGE_CACHE_SIZE) {
2453 args.prod = 1;
2454 args.mod = 0;
2455 } else {
2456 args.prod = PAGE_CACHE_SIZE >> mp->m_sb.sb_blocklog;
2457 if ((args.mod = (xfs_extlen_t)(do_mod(ap->offset, args.prod))))
2458 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2459 }
2460 /*
2461 * If we are not low on available data blocks, and the
2462 * underlying logical volume manager is a stripe, and
2463 * the file offset is zero then try to allocate data
2464 * blocks on stripe unit boundary.
2465 * NOTE: ap->aeof is only set if the allocation length
2466 * is >= the stripe unit and the allocation offset is
2467 * at the end of file.
2468 */
2469 if (!ap->flist->xbf_low && ap->aeof) {
2470 if (!ap->offset) {
2471 args.alignment = mp->m_dalign;
2472 atype = args.type;
2473 isaligned = 1;
2474 /*
2475 * Adjust for alignment
2476 */
2477 if (blen > args.alignment && blen <= args.maxlen)
2478 args.minlen = blen - args.alignment;
2479 args.minalignslop = 0;
2480 } else {
2481 /*
2482 * First try an exact bno allocation.
2483 * If it fails then do a near or start bno
2484 * allocation with alignment turned on.
2485 */
2486 atype = args.type;
2487 tryagain = 1;
2488 args.type = XFS_ALLOCTYPE_THIS_BNO;
2489 args.alignment = 1;
2490 /*
2491 * Compute the minlen+alignment for the
2492 * next case. Set slop so that the value
2493 * of minlen+alignment+slop doesn't go up
2494 * between the calls.
2495 */
2496 if (blen > mp->m_dalign && blen <= args.maxlen)
2497 nextminlen = blen - mp->m_dalign;
2498 else
2499 nextminlen = args.minlen;
2500 if (nextminlen + mp->m_dalign > args.minlen + 1)
2501 args.minalignslop =
2502 nextminlen + mp->m_dalign -
2503 args.minlen - 1;
2504 else
2505 args.minalignslop = 0;
2506 }
2507 } else {
2508 args.alignment = 1;
2509 args.minalignslop = 0;
2510 }
2511 args.minleft = ap->minleft;
2512 args.wasdel = ap->wasdel;
2513 args.isfl = 0;
2514 args.userdata = ap->userdata;
2515 if ((error = xfs_alloc_vextent(&args)))
2516 return error;
2517 if (tryagain && args.fsbno == NULLFSBLOCK) {
2518 /*
2519 * Exact allocation failed. Now try with alignment
2520 * turned on.
2521 */
2522 args.type = atype;
2523 args.fsbno = ap->blkno;
2524 args.alignment = mp->m_dalign;
2525 args.minlen = nextminlen;
2526 args.minalignslop = 0;
2527 isaligned = 1;
2528 if ((error = xfs_alloc_vextent(&args)))
2529 return error;
2530 }
2531 if (isaligned && args.fsbno == NULLFSBLOCK) {
2532 /*
2533 * allocation failed, so turn off alignment and
2534 * try again.
2535 */
2536 args.type = atype;
2537 args.fsbno = ap->blkno;
2538 args.alignment = 0;
2539 if ((error = xfs_alloc_vextent(&args)))
2540 return error;
2541 }
2542 if (args.fsbno == NULLFSBLOCK && nullfb &&
2543 args.minlen > ap->minlen) {
2544 args.minlen = ap->minlen;
2545 args.type = XFS_ALLOCTYPE_START_BNO;
2546 args.fsbno = ap->blkno;
2547 if ((error = xfs_alloc_vextent(&args)))
2548 return error;
2549 }
2550 if (args.fsbno == NULLFSBLOCK && nullfb) {
2551 args.fsbno = 0;
2552 args.type = XFS_ALLOCTYPE_FIRST_AG;
2553 args.total = ap->minlen;
2554 args.minleft = 0;
2555 if ((error = xfs_alloc_vextent(&args)))
2556 return error;
2557 ap->flist->xbf_low = 1;
2558 }
2559 if (args.fsbno != NULLFSBLOCK) {
2560 /*
2561 * check the allocation happened at the same or higher AG than
2562 * the first block that was allocated.
2563 */
2564 ASSERT(*ap->firstblock == NULLFSBLOCK ||
2565 XFS_FSB_TO_AGNO(mp, *ap->firstblock) ==
2566 XFS_FSB_TO_AGNO(mp, args.fsbno) ||
2567 (ap->flist->xbf_low &&
2568 XFS_FSB_TO_AGNO(mp, *ap->firstblock) <
2569 XFS_FSB_TO_AGNO(mp, args.fsbno)));
2570
2571 ap->blkno = args.fsbno;
2572 if (*ap->firstblock == NULLFSBLOCK)
2573 *ap->firstblock = args.fsbno;
2574 ASSERT(nullfb || fb_agno == args.agno ||
2575 (ap->flist->xbf_low && fb_agno < args.agno));
2576 ap->length = args.len;
2577 ap->ip->i_d.di_nblocks += args.len;
2578 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2579 if (ap->wasdel)
2580 ap->ip->i_delayed_blks -= args.len;
2581 /*
2582 * Adjust the disk quota also. This was reserved
2583 * earlier.
2584 */
2585 xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
2586 ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
2587 XFS_TRANS_DQ_BCOUNT,
2588 (long) args.len);
2589 } else {
2590 ap->blkno = NULLFSBLOCK;
2591 ap->length = 0;
2592 }
2593 return 0;
2594 }
2595
2596 /*
2597 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
2598 * It figures out where to ask the underlying allocator to put the new extent.
2599 */
2600 STATIC int
2601 xfs_bmap_alloc(
2602 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2603 {
2604 if (XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata)
2605 return xfs_bmap_rtalloc(ap);
2606 return xfs_bmap_btalloc(ap);
2607 }
2608
2609 /*
2610 * Transform a btree format file with only one leaf node, where the
2611 * extents list will fit in the inode, into an extents format file.
2612 * Since the file extents are already in-core, all we have to do is
2613 * give up the space for the btree root and pitch the leaf block.
2614 */
2615 STATIC int /* error */
2616 xfs_bmap_btree_to_extents(
2617 xfs_trans_t *tp, /* transaction pointer */
2618 xfs_inode_t *ip, /* incore inode pointer */
2619 xfs_btree_cur_t *cur, /* btree cursor */
2620 int *logflagsp, /* inode logging flags */
2621 int whichfork) /* data or attr fork */
2622 {
2623 /* REFERENCED */
2624 struct xfs_btree_block *cblock;/* child btree block */
2625 xfs_fsblock_t cbno; /* child block number */
2626 xfs_buf_t *cbp; /* child block's buffer */
2627 int error; /* error return value */
2628 xfs_ifork_t *ifp; /* inode fork data */
2629 xfs_mount_t *mp; /* mount point structure */
2630 __be64 *pp; /* ptr to block address */
2631 struct xfs_btree_block *rblock;/* root btree block */
2632
2633 mp = ip->i_mount;
2634 ifp = XFS_IFORK_PTR(ip, whichfork);
2635 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
2636 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
2637 rblock = ifp->if_broot;
2638 ASSERT(be16_to_cpu(rblock->bb_level) == 1);
2639 ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
2640 ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1);
2641 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes);
2642 cbno = be64_to_cpu(*pp);
2643 *logflagsp = 0;
2644 #ifdef DEBUG
2645 if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
2646 return error;
2647 #endif
2648 if ((error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp,
2649 XFS_BMAP_BTREE_REF)))
2650 return error;
2651 cblock = XFS_BUF_TO_BLOCK(cbp);
2652 if ((error = xfs_btree_check_block(cur, cblock, 0, cbp)))
2653 return error;
2654 xfs_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
2655 ip->i_d.di_nblocks--;
2656 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
2657 xfs_trans_binval(tp, cbp);
2658 if (cur->bc_bufs[0] == cbp)
2659 cur->bc_bufs[0] = NULL;
2660 xfs_iroot_realloc(ip, -1, whichfork);
2661 ASSERT(ifp->if_broot == NULL);
2662 ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
2663 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
2664 *logflagsp = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
2665 return 0;
2666 }
2667
2668 /*
2669 * Called by xfs_bmapi to update file extent records and the btree
2670 * after removing space (or undoing a delayed allocation).
2671 */
2672 STATIC int /* error */
2673 xfs_bmap_del_extent(
2674 xfs_inode_t *ip, /* incore inode pointer */
2675 xfs_trans_t *tp, /* current transaction pointer */
2676 xfs_extnum_t *idx, /* extent number to update/delete */
2677 xfs_bmap_free_t *flist, /* list of extents to be freed */
2678 xfs_btree_cur_t *cur, /* if null, not a btree */
2679 xfs_bmbt_irec_t *del, /* data to remove from extents */
2680 int *logflagsp, /* inode logging flags */
2681 int whichfork) /* data or attr fork */
2682 {
2683 xfs_filblks_t da_new; /* new delay-alloc indirect blocks */
2684 xfs_filblks_t da_old; /* old delay-alloc indirect blocks */
2685 xfs_fsblock_t del_endblock=0; /* first block past del */
2686 xfs_fileoff_t del_endoff; /* first offset past del */
2687 int delay; /* current block is delayed allocated */
2688 int do_fx; /* free extent at end of routine */
2689 xfs_bmbt_rec_host_t *ep; /* current extent entry pointer */
2690 int error; /* error return value */
2691 int flags; /* inode logging flags */
2692 xfs_bmbt_irec_t got; /* current extent entry */
2693 xfs_fileoff_t got_endoff; /* first offset past got */
2694 int i; /* temp state */
2695 xfs_ifork_t *ifp; /* inode fork pointer */
2696 xfs_mount_t *mp; /* mount structure */
2697 xfs_filblks_t nblks; /* quota/sb block count */
2698 xfs_bmbt_irec_t new; /* new record to be inserted */
2699 /* REFERENCED */
2700 uint qfield; /* quota field to update */
2701 xfs_filblks_t temp; /* for indirect length calculations */
2702 xfs_filblks_t temp2; /* for indirect length calculations */
2703 int state = 0;
2704
2705 XFS_STATS_INC(xs_del_exlist);
2706
2707 if (whichfork == XFS_ATTR_FORK)
2708 state |= BMAP_ATTRFORK;
2709
2710 mp = ip->i_mount;
2711 ifp = XFS_IFORK_PTR(ip, whichfork);
2712 ASSERT((*idx >= 0) && (*idx < ifp->if_bytes /
2713 (uint)sizeof(xfs_bmbt_rec_t)));
2714 ASSERT(del->br_blockcount > 0);
2715 ep = xfs_iext_get_ext(ifp, *idx);
2716 xfs_bmbt_get_all(ep, &got);
2717 ASSERT(got.br_startoff <= del->br_startoff);
2718 del_endoff = del->br_startoff + del->br_blockcount;
2719 got_endoff = got.br_startoff + got.br_blockcount;
2720 ASSERT(got_endoff >= del_endoff);
2721 delay = isnullstartblock(got.br_startblock);
2722 ASSERT(isnullstartblock(del->br_startblock) == delay);
2723 flags = 0;
2724 qfield = 0;
2725 error = 0;
2726 /*
2727 * If deleting a real allocation, must free up the disk space.
2728 */
2729 if (!delay) {
2730 flags = XFS_ILOG_CORE;
2731 /*
2732 * Realtime allocation. Free it and record di_nblocks update.
2733 */
2734 if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
2735 xfs_fsblock_t bno;
2736 xfs_filblks_t len;
2737
2738 ASSERT(do_mod(del->br_blockcount,
2739 mp->m_sb.sb_rextsize) == 0);
2740 ASSERT(do_mod(del->br_startblock,
2741 mp->m_sb.sb_rextsize) == 0);
2742 bno = del->br_startblock;
2743 len = del->br_blockcount;
2744 do_div(bno, mp->m_sb.sb_rextsize);
2745 do_div(len, mp->m_sb.sb_rextsize);
2746 error = xfs_rtfree_extent(tp, bno, (xfs_extlen_t)len);
2747 if (error)
2748 goto done;
2749 do_fx = 0;
2750 nblks = len * mp->m_sb.sb_rextsize;
2751 qfield = XFS_TRANS_DQ_RTBCOUNT;
2752 }
2753 /*
2754 * Ordinary allocation.
2755 */
2756 else {
2757 do_fx = 1;
2758 nblks = del->br_blockcount;
2759 qfield = XFS_TRANS_DQ_BCOUNT;
2760 }
2761 /*
2762 * Set up del_endblock and cur for later.
2763 */
2764 del_endblock = del->br_startblock + del->br_blockcount;
2765 if (cur) {
2766 if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
2767 got.br_startblock, got.br_blockcount,
2768 &i)))
2769 goto done;
2770 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2771 }
2772 da_old = da_new = 0;
2773 } else {
2774 da_old = startblockval(got.br_startblock);
2775 da_new = 0;
2776 nblks = 0;
2777 do_fx = 0;
2778 }
2779 /*
2780 * Set flag value to use in switch statement.
2781 * Left-contig is 2, right-contig is 1.
2782 */
2783 switch (((got.br_startoff == del->br_startoff) << 1) |
2784 (got_endoff == del_endoff)) {
2785 case 3:
2786 /*
2787 * Matches the whole extent. Delete the entry.
2788 */
2789 xfs_iext_remove(ip, *idx, 1,
2790 whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0);
2791 --*idx;
2792 if (delay)
2793 break;
2794
2795 XFS_IFORK_NEXT_SET(ip, whichfork,
2796 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
2797 flags |= XFS_ILOG_CORE;
2798 if (!cur) {
2799 flags |= xfs_ilog_fext(whichfork);
2800 break;
2801 }
2802 if ((error = xfs_btree_delete(cur, &i)))
2803 goto done;
2804 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2805 break;
2806
2807 case 2:
2808 /*
2809 * Deleting the first part of the extent.
2810 */
2811 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2812 xfs_bmbt_set_startoff(ep, del_endoff);
2813 temp = got.br_blockcount - del->br_blockcount;
2814 xfs_bmbt_set_blockcount(ep, temp);
2815 if (delay) {
2816 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2817 da_old);
2818 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
2819 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2820 da_new = temp;
2821 break;
2822 }
2823 xfs_bmbt_set_startblock(ep, del_endblock);
2824 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2825 if (!cur) {
2826 flags |= xfs_ilog_fext(whichfork);
2827 break;
2828 }
2829 if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
2830 got.br_blockcount - del->br_blockcount,
2831 got.br_state)))
2832 goto done;
2833 break;
2834
2835 case 1:
2836 /*
2837 * Deleting the last part of the extent.
2838 */
2839 temp = got.br_blockcount - del->br_blockcount;
2840 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2841 xfs_bmbt_set_blockcount(ep, temp);
2842 if (delay) {
2843 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2844 da_old);
2845 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
2846 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2847 da_new = temp;
2848 break;
2849 }
2850 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2851 if (!cur) {
2852 flags |= xfs_ilog_fext(whichfork);
2853 break;
2854 }
2855 if ((error = xfs_bmbt_update(cur, got.br_startoff,
2856 got.br_startblock,
2857 got.br_blockcount - del->br_blockcount,
2858 got.br_state)))
2859 goto done;
2860 break;
2861
2862 case 0:
2863 /*
2864 * Deleting the middle of the extent.
2865 */
2866 temp = del->br_startoff - got.br_startoff;
2867 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2868 xfs_bmbt_set_blockcount(ep, temp);
2869 new.br_startoff = del_endoff;
2870 temp2 = got_endoff - del_endoff;
2871 new.br_blockcount = temp2;
2872 new.br_state = got.br_state;
2873 if (!delay) {
2874 new.br_startblock = del_endblock;
2875 flags |= XFS_ILOG_CORE;
2876 if (cur) {
2877 if ((error = xfs_bmbt_update(cur,
2878 got.br_startoff,
2879 got.br_startblock, temp,
2880 got.br_state)))
2881 goto done;
2882 if ((error = xfs_btree_increment(cur, 0, &i)))
2883 goto done;
2884 cur->bc_rec.b = new;
2885 error = xfs_btree_insert(cur, &i);
2886 if (error && error != ENOSPC)
2887 goto done;
2888 /*
2889 * If get no-space back from btree insert,
2890 * it tried a split, and we have a zero
2891 * block reservation.
2892 * Fix up our state and return the error.
2893 */
2894 if (error == ENOSPC) {
2895 /*
2896 * Reset the cursor, don't trust
2897 * it after any insert operation.
2898 */
2899 if ((error = xfs_bmbt_lookup_eq(cur,
2900 got.br_startoff,
2901 got.br_startblock,
2902 temp, &i)))
2903 goto done;
2904 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2905 /*
2906 * Update the btree record back
2907 * to the original value.
2908 */
2909 if ((error = xfs_bmbt_update(cur,
2910 got.br_startoff,
2911 got.br_startblock,
2912 got.br_blockcount,
2913 got.br_state)))
2914 goto done;
2915 /*
2916 * Reset the extent record back
2917 * to the original value.
2918 */
2919 xfs_bmbt_set_blockcount(ep,
2920 got.br_blockcount);
2921 flags = 0;
2922 error = XFS_ERROR(ENOSPC);
2923 goto done;
2924 }
2925 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2926 } else
2927 flags |= xfs_ilog_fext(whichfork);
2928 XFS_IFORK_NEXT_SET(ip, whichfork,
2929 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
2930 } else {
2931 ASSERT(whichfork == XFS_DATA_FORK);
2932 temp = xfs_bmap_worst_indlen(ip, temp);
2933 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
2934 temp2 = xfs_bmap_worst_indlen(ip, temp2);
2935 new.br_startblock = nullstartblock((int)temp2);
2936 da_new = temp + temp2;
2937 while (da_new > da_old) {
2938 if (temp) {
2939 temp--;
2940 da_new--;
2941 xfs_bmbt_set_startblock(ep,
2942 nullstartblock((int)temp));
2943 }
2944 if (da_new == da_old)
2945 break;
2946 if (temp2) {
2947 temp2--;
2948 da_new--;
2949 new.br_startblock =
2950 nullstartblock((int)temp2);
2951 }
2952 }
2953 }
2954 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2955 xfs_iext_insert(ip, *idx + 1, 1, &new, state);
2956 ++*idx;
2957 break;
2958 }
2959 /*
2960 * If we need to, add to list of extents to delete.
2961 */
2962 if (do_fx)
2963 xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
2964 mp);
2965 /*
2966 * Adjust inode # blocks in the file.
2967 */
2968 if (nblks)
2969 ip->i_d.di_nblocks -= nblks;
2970 /*
2971 * Adjust quota data.
2972 */
2973 if (qfield)
2974 xfs_trans_mod_dquot_byino(tp, ip, qfield, (long)-nblks);
2975
2976 /*
2977 * Account for change in delayed indirect blocks.
2978 * Nothing to do for disk quota accounting here.
2979 */
2980 ASSERT(da_old >= da_new);
2981 if (da_old > da_new) {
2982 xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
2983 (int64_t)(da_old - da_new), 0);
2984 }
2985 done:
2986 *logflagsp = flags;
2987 return error;
2988 }
2989
2990 /*
2991 * Remove the entry "free" from the free item list. Prev points to the
2992 * previous entry, unless "free" is the head of the list.
2993 */
2994 STATIC void
2995 xfs_bmap_del_free(
2996 xfs_bmap_free_t *flist, /* free item list header */
2997 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
2998 xfs_bmap_free_item_t *free) /* list item to be freed */
2999 {
3000 if (prev)
3001 prev->xbfi_next = free->xbfi_next;
3002 else
3003 flist->xbf_first = free->xbfi_next;
3004 flist->xbf_count--;
3005 kmem_zone_free(xfs_bmap_free_item_zone, free);
3006 }
3007
3008 /*
3009 * Convert an extents-format file into a btree-format file.
3010 * The new file will have a root block (in the inode) and a single child block.
3011 */
3012 STATIC int /* error */
3013 xfs_bmap_extents_to_btree(
3014 xfs_trans_t *tp, /* transaction pointer */
3015 xfs_inode_t *ip, /* incore inode pointer */
3016 xfs_fsblock_t *firstblock, /* first-block-allocated */
3017 xfs_bmap_free_t *flist, /* blocks freed in xaction */
3018 xfs_btree_cur_t **curp, /* cursor returned to caller */
3019 int wasdel, /* converting a delayed alloc */
3020 int *logflagsp, /* inode logging flags */
3021 int whichfork) /* data or attr fork */
3022 {
3023 struct xfs_btree_block *ablock; /* allocated (child) bt block */
3024 xfs_buf_t *abp; /* buffer for ablock */
3025 xfs_alloc_arg_t args; /* allocation arguments */
3026 xfs_bmbt_rec_t *arp; /* child record pointer */
3027 struct xfs_btree_block *block; /* btree root block */
3028 xfs_btree_cur_t *cur; /* bmap btree cursor */
3029 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3030 int error; /* error return value */
3031 xfs_extnum_t i, cnt; /* extent record index */
3032 xfs_ifork_t *ifp; /* inode fork pointer */
3033 xfs_bmbt_key_t *kp; /* root block key pointer */
3034 xfs_mount_t *mp; /* mount structure */
3035 xfs_extnum_t nextents; /* number of file extents */
3036 xfs_bmbt_ptr_t *pp; /* root block address pointer */
3037
3038 ifp = XFS_IFORK_PTR(ip, whichfork);
3039 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
3040 ASSERT(ifp->if_ext_max ==
3041 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
3042 /*
3043 * Make space in the inode incore.
3044 */
3045 xfs_iroot_realloc(ip, 1, whichfork);
3046 ifp->if_flags |= XFS_IFBROOT;
3047
3048 /*
3049 * Fill in the root.
3050 */
3051 block = ifp->if_broot;
3052 block->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3053 block->bb_level = cpu_to_be16(1);
3054 block->bb_numrecs = cpu_to_be16(1);
3055 block->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
3056 block->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
3057
3058 /*
3059 * Need a cursor. Can't allocate until bb_level is filled in.
3060 */
3061 mp = ip->i_mount;
3062 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
3063 cur->bc_private.b.firstblock = *firstblock;
3064 cur->bc_private.b.flist = flist;
3065 cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
3066 /*
3067 * Convert to a btree with two levels, one record in root.
3068 */
3069 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
3070 args.tp = tp;
3071 args.mp = mp;
3072 args.firstblock = *firstblock;
3073 if (*firstblock == NULLFSBLOCK) {
3074 args.type = XFS_ALLOCTYPE_START_BNO;
3075 args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
3076 } else if (flist->xbf_low) {
3077 args.type = XFS_ALLOCTYPE_START_BNO;
3078 args.fsbno = *firstblock;
3079 } else {
3080 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3081 args.fsbno = *firstblock;
3082 }
3083 args.minlen = args.maxlen = args.prod = 1;
3084 args.total = args.minleft = args.alignment = args.mod = args.isfl =
3085 args.minalignslop = 0;
3086 args.wasdel = wasdel;
3087 *logflagsp = 0;
3088 if ((error = xfs_alloc_vextent(&args))) {
3089 xfs_iroot_realloc(ip, -1, whichfork);
3090 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
3091 return error;
3092 }
3093 /*
3094 * Allocation can't fail, the space was reserved.
3095 */
3096 ASSERT(args.fsbno != NULLFSBLOCK);
3097 ASSERT(*firstblock == NULLFSBLOCK ||
3098 args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) ||
3099 (flist->xbf_low &&
3100 args.agno > XFS_FSB_TO_AGNO(mp, *firstblock)));
3101 *firstblock = cur->bc_private.b.firstblock = args.fsbno;
3102 cur->bc_private.b.allocated++;
3103 ip->i_d.di_nblocks++;
3104 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
3105 abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
3106 /*
3107 * Fill in the child block.
3108 */
3109 ablock = XFS_BUF_TO_BLOCK(abp);
3110 ablock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3111 ablock->bb_level = 0;
3112 ablock->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
3113 ablock->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
3114 arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
3115 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3116 for (cnt = i = 0; i < nextents; i++) {
3117 ep = xfs_iext_get_ext(ifp, i);
3118 if (!isnullstartblock(xfs_bmbt_get_startblock(ep))) {
3119 arp->l0 = cpu_to_be64(ep->l0);
3120 arp->l1 = cpu_to_be64(ep->l1);
3121 arp++; cnt++;
3122 }
3123 }
3124 ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
3125 xfs_btree_set_numrecs(ablock, cnt);
3126
3127 /*
3128 * Fill in the root key and pointer.
3129 */
3130 kp = XFS_BMBT_KEY_ADDR(mp, block, 1);
3131 arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
3132 kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
3133 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur,
3134 be16_to_cpu(block->bb_level)));
3135 *pp = cpu_to_be64(args.fsbno);
3136
3137 /*
3138 * Do all this logging at the end so that
3139 * the root is at the right level.
3140 */
3141 xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS);
3142 xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
3143 ASSERT(*curp == NULL);
3144 *curp = cur;
3145 *logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork);
3146 return 0;
3147 }
3148
3149 /*
3150 * Calculate the default attribute fork offset for newly created inodes.
3151 */
3152 uint
3153 xfs_default_attroffset(
3154 struct xfs_inode *ip)
3155 {
3156 struct xfs_mount *mp = ip->i_mount;
3157 uint offset;
3158
3159 if (mp->m_sb.sb_inodesize == 256) {
3160 offset = XFS_LITINO(mp) -
3161 XFS_BMDR_SPACE_CALC(MINABTPTRS);
3162 } else {
3163 offset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
3164 }
3165
3166 ASSERT(offset < XFS_LITINO(mp));
3167 return offset;
3168 }
3169
3170 /*
3171 * Helper routine to reset inode di_forkoff field when switching
3172 * attribute fork from local to extent format - we reset it where
3173 * possible to make space available for inline data fork extents.
3174 */
3175 STATIC void
3176 xfs_bmap_forkoff_reset(
3177 xfs_mount_t *mp,
3178 xfs_inode_t *ip,
3179 int whichfork)
3180 {
3181 if (whichfork == XFS_ATTR_FORK &&
3182 ip->i_d.di_format != XFS_DINODE_FMT_DEV &&
3183 ip->i_d.di_format != XFS_DINODE_FMT_UUID &&
3184 ip->i_d.di_format != XFS_DINODE_FMT_BTREE) {
3185 uint dfl_forkoff = xfs_default_attroffset(ip) >> 3;
3186
3187 if (dfl_forkoff > ip->i_d.di_forkoff) {
3188 ip->i_d.di_forkoff = dfl_forkoff;
3189 ip->i_df.if_ext_max =
3190 XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t);
3191 ip->i_afp->if_ext_max =
3192 XFS_IFORK_ASIZE(ip) / sizeof(xfs_bmbt_rec_t);
3193 }
3194 }
3195 }
3196
3197 /*
3198 * Convert a local file to an extents file.
3199 * This code is out of bounds for data forks of regular files,
3200 * since the file data needs to get logged so things will stay consistent.
3201 * (The bmap-level manipulations are ok, though).
3202 */
3203 STATIC int /* error */
3204 xfs_bmap_local_to_extents(
3205 xfs_trans_t *tp, /* transaction pointer */
3206 xfs_inode_t *ip, /* incore inode pointer */
3207 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
3208 xfs_extlen_t total, /* total blocks needed by transaction */
3209 int *logflagsp, /* inode logging flags */
3210 int whichfork) /* data or attr fork */
3211 {
3212 int error; /* error return value */
3213 int flags; /* logging flags returned */
3214 xfs_ifork_t *ifp; /* inode fork pointer */
3215
3216 /*
3217 * We don't want to deal with the case of keeping inode data inline yet.
3218 * So sending the data fork of a regular inode is invalid.
3219 */
3220 ASSERT(!(S_ISREG(ip->i_d.di_mode) && whichfork == XFS_DATA_FORK));
3221 ifp = XFS_IFORK_PTR(ip, whichfork);
3222 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
3223 flags = 0;
3224 error = 0;
3225 if (ifp->if_bytes) {
3226 xfs_alloc_arg_t args; /* allocation arguments */
3227 xfs_buf_t *bp; /* buffer for extent block */
3228 xfs_bmbt_rec_host_t *ep;/* extent record pointer */
3229
3230 args.tp = tp;
3231 args.mp = ip->i_mount;
3232 args.firstblock = *firstblock;
3233 ASSERT((ifp->if_flags &
3234 (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) == XFS_IFINLINE);
3235 /*
3236 * Allocate a block. We know we need only one, since the
3237 * file currently fits in an inode.
3238 */
3239 if (*firstblock == NULLFSBLOCK) {
3240 args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
3241 args.type = XFS_ALLOCTYPE_START_BNO;
3242 } else {
3243 args.fsbno = *firstblock;
3244 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3245 }
3246 args.total = total;
3247 args.mod = args.minleft = args.alignment = args.wasdel =
3248 args.isfl = args.minalignslop = 0;
3249 args.minlen = args.maxlen = args.prod = 1;
3250 if ((error = xfs_alloc_vextent(&args)))
3251 goto done;
3252 /*
3253 * Can't fail, the space was reserved.
3254 */
3255 ASSERT(args.fsbno != NULLFSBLOCK);
3256 ASSERT(args.len == 1);
3257 *firstblock = args.fsbno;
3258 bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
3259 memcpy(bp->b_addr, ifp->if_u1.if_data, ifp->if_bytes);
3260 xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
3261 xfs_bmap_forkoff_reset(args.mp, ip, whichfork);
3262 xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
3263 xfs_iext_add(ifp, 0, 1);
3264 ep = xfs_iext_get_ext(ifp, 0);
3265 xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
3266 trace_xfs_bmap_post_update(ip, 0,
3267 whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0,
3268 _THIS_IP_);
3269 XFS_IFORK_NEXT_SET(ip, whichfork, 1);
3270 ip->i_d.di_nblocks = 1;
3271 xfs_trans_mod_dquot_byino(tp, ip,
3272 XFS_TRANS_DQ_BCOUNT, 1L);
3273 flags |= xfs_ilog_fext(whichfork);
3274 } else {
3275 ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
3276 xfs_bmap_forkoff_reset(ip->i_mount, ip, whichfork);
3277 }
3278 ifp->if_flags &= ~XFS_IFINLINE;
3279 ifp->if_flags |= XFS_IFEXTENTS;
3280 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
3281 flags |= XFS_ILOG_CORE;
3282 done:
3283 *logflagsp = flags;
3284 return error;
3285 }
3286
3287 /*
3288 * Search the extent records for the entry containing block bno.
3289 * If bno lies in a hole, point to the next entry. If bno lies
3290 * past eof, *eofp will be set, and *prevp will contain the last
3291 * entry (null if none). Else, *lastxp will be set to the index
3292 * of the found entry; *gotp will contain the entry.
3293 */
3294 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
3295 xfs_bmap_search_multi_extents(
3296 xfs_ifork_t *ifp, /* inode fork pointer */
3297 xfs_fileoff_t bno, /* block number searched for */
3298 int *eofp, /* out: end of file found */
3299 xfs_extnum_t *lastxp, /* out: last extent index */
3300 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3301 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3302 {
3303 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3304 xfs_extnum_t lastx; /* last extent index */
3305
3306 /*
3307 * Initialize the extent entry structure to catch access to
3308 * uninitialized br_startblock field.
3309 */
3310 gotp->br_startoff = 0xffa5a5a5a5a5a5a5LL;
3311 gotp->br_blockcount = 0xa55a5a5a5a5a5a5aLL;
3312 gotp->br_state = XFS_EXT_INVALID;
3313 #if XFS_BIG_BLKNOS
3314 gotp->br_startblock = 0xffffa5a5a5a5a5a5LL;
3315 #else
3316 gotp->br_startblock = 0xffffa5a5;
3317 #endif
3318 prevp->br_startoff = NULLFILEOFF;
3319
3320 ep = xfs_iext_bno_to_ext(ifp, bno, &lastx);
3321 if (lastx > 0) {
3322 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx - 1), prevp);
3323 }
3324 if (lastx < (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
3325 xfs_bmbt_get_all(ep, gotp);
3326 *eofp = 0;
3327 } else {
3328 if (lastx > 0) {
3329 *gotp = *prevp;
3330 }
3331 *eofp = 1;
3332 ep = NULL;
3333 }
3334 *lastxp = lastx;
3335 return ep;
3336 }
3337
3338 /*
3339 * Search the extents list for the inode, for the extent containing bno.
3340 * If bno lies in a hole, point to the next entry. If bno lies past eof,
3341 * *eofp will be set, and *prevp will contain the last entry (null if none).
3342 * Else, *lastxp will be set to the index of the found
3343 * entry; *gotp will contain the entry.
3344 */
3345 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
3346 xfs_bmap_search_extents(
3347 xfs_inode_t *ip, /* incore inode pointer */
3348 xfs_fileoff_t bno, /* block number searched for */
3349 int fork, /* data or attr fork */
3350 int *eofp, /* out: end of file found */
3351 xfs_extnum_t *lastxp, /* out: last extent index */
3352 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3353 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3354 {
3355 xfs_ifork_t *ifp; /* inode fork pointer */
3356 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3357
3358 XFS_STATS_INC(xs_look_exlist);
3359 ifp = XFS_IFORK_PTR(ip, fork);
3360
3361 ep = xfs_bmap_search_multi_extents(ifp, bno, eofp, lastxp, gotp, prevp);
3362
3363 if (unlikely(!(gotp->br_startblock) && (*lastxp != NULLEXTNUM) &&
3364 !(XFS_IS_REALTIME_INODE(ip) && fork == XFS_DATA_FORK))) {
3365 xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO,
3366 "Access to block zero in inode %llu "
3367 "start_block: %llx start_off: %llx "
3368 "blkcnt: %llx extent-state: %x lastx: %x\n",
3369 (unsigned long long)ip->i_ino,
3370 (unsigned long long)gotp->br_startblock,
3371 (unsigned long long)gotp->br_startoff,
3372 (unsigned long long)gotp->br_blockcount,
3373 gotp->br_state, *lastxp);
3374 *lastxp = NULLEXTNUM;
3375 *eofp = 1;
3376 return NULL;
3377 }
3378 return ep;
3379 }
3380
3381 /*
3382 * Compute the worst-case number of indirect blocks that will be used
3383 * for ip's delayed extent of length "len".
3384 */
3385 STATIC xfs_filblks_t
3386 xfs_bmap_worst_indlen(
3387 xfs_inode_t *ip, /* incore inode pointer */
3388 xfs_filblks_t len) /* delayed extent length */
3389 {
3390 int level; /* btree level number */
3391 int maxrecs; /* maximum record count at this level */
3392 xfs_mount_t *mp; /* mount structure */
3393 xfs_filblks_t rval; /* return value */
3394
3395 mp = ip->i_mount;
3396 maxrecs = mp->m_bmap_dmxr[0];
3397 for (level = 0, rval = 0;
3398 level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
3399 level++) {
3400 len += maxrecs - 1;
3401 do_div(len, maxrecs);
3402 rval += len;
3403 if (len == 1)
3404 return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
3405 level - 1;
3406 if (level == 0)
3407 maxrecs = mp->m_bmap_dmxr[1];
3408 }
3409 return rval;
3410 }
3411
3412 /*
3413 * Convert inode from non-attributed to attributed.
3414 * Must not be in a transaction, ip must not be locked.
3415 */
3416 int /* error code */
3417 xfs_bmap_add_attrfork(
3418 xfs_inode_t *ip, /* incore inode pointer */
3419 int size, /* space new attribute needs */
3420 int rsvd) /* xact may use reserved blks */
3421 {
3422 xfs_fsblock_t firstblock; /* 1st block/ag allocated */
3423 xfs_bmap_free_t flist; /* freed extent records */
3424 xfs_mount_t *mp; /* mount structure */
3425 xfs_trans_t *tp; /* transaction pointer */
3426 int blks; /* space reservation */
3427 int version = 1; /* superblock attr version */
3428 int committed; /* xaction was committed */
3429 int logflags; /* logging flags */
3430 int error; /* error return value */
3431
3432 ASSERT(XFS_IFORK_Q(ip) == 0);
3433 ASSERT(ip->i_df.if_ext_max ==
3434 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3435
3436 mp = ip->i_mount;
3437 ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
3438 tp = xfs_trans_alloc(mp, XFS_TRANS_ADDAFORK);
3439 blks = XFS_ADDAFORK_SPACE_RES(mp);
3440 if (rsvd)
3441 tp->t_flags |= XFS_TRANS_RESERVE;
3442 if ((error = xfs_trans_reserve(tp, blks, XFS_ADDAFORK_LOG_RES(mp), 0,
3443 XFS_TRANS_PERM_LOG_RES, XFS_ADDAFORK_LOG_COUNT)))
3444 goto error0;
3445 xfs_ilock(ip, XFS_ILOCK_EXCL);
3446 error = xfs_trans_reserve_quota_nblks(tp, ip, blks, 0, rsvd ?
3447 XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
3448 XFS_QMOPT_RES_REGBLKS);
3449 if (error) {
3450 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3451 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
3452 return error;
3453 }
3454 if (XFS_IFORK_Q(ip))
3455 goto error1;
3456 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
3457 /*
3458 * For inodes coming from pre-6.2 filesystems.
3459 */
3460 ASSERT(ip->i_d.di_aformat == 0);
3461 ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
3462 }
3463 ASSERT(ip->i_d.di_anextents == 0);
3464
3465 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
3466 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
3467
3468 switch (ip->i_d.di_format) {
3469 case XFS_DINODE_FMT_DEV:
3470 ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
3471 break;
3472 case XFS_DINODE_FMT_UUID:
3473 ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
3474 break;
3475 case XFS_DINODE_FMT_LOCAL:
3476 case XFS_DINODE_FMT_EXTENTS:
3477 case XFS_DINODE_FMT_BTREE:
3478 ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
3479 if (!ip->i_d.di_forkoff)
3480 ip->i_d.di_forkoff = xfs_default_attroffset(ip) >> 3;
3481 else if (mp->m_flags & XFS_MOUNT_ATTR2)
3482 version = 2;
3483 break;
3484 default:
3485 ASSERT(0);
3486 error = XFS_ERROR(EINVAL);
3487 goto error1;
3488 }
3489 ip->i_df.if_ext_max =
3490 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
3491 ASSERT(ip->i_afp == NULL);
3492 ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
3493 ip->i_afp->if_ext_max =
3494 XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
3495 ip->i_afp->if_flags = XFS_IFEXTENTS;
3496 logflags = 0;
3497 xfs_bmap_init(&flist, &firstblock);
3498 switch (ip->i_d.di_format) {
3499 case XFS_DINODE_FMT_LOCAL:
3500 error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &flist,
3501 &logflags);
3502 break;
3503 case XFS_DINODE_FMT_EXTENTS:
3504 error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
3505 &flist, &logflags);
3506 break;
3507 case XFS_DINODE_FMT_BTREE:
3508 error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &flist,
3509 &logflags);
3510 break;
3511 default:
3512 error = 0;
3513 break;
3514 }
3515 if (logflags)
3516 xfs_trans_log_inode(tp, ip, logflags);
3517 if (error)
3518 goto error2;
3519 if (!xfs_sb_version_hasattr(&mp->m_sb) ||
3520 (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2)) {
3521 __int64_t sbfields = 0;
3522
3523 spin_lock(&mp->m_sb_lock);
3524 if (!xfs_sb_version_hasattr(&mp->m_sb)) {
3525 xfs_sb_version_addattr(&mp->m_sb);
3526 sbfields |= XFS_SB_VERSIONNUM;
3527 }
3528 if (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2) {
3529 xfs_sb_version_addattr2(&mp->m_sb);
3530 sbfields |= (XFS_SB_VERSIONNUM | XFS_SB_FEATURES2);
3531 }
3532 if (sbfields) {
3533 spin_unlock(&mp->m_sb_lock);
3534 xfs_mod_sb(tp, sbfields);
3535 } else
3536 spin_unlock(&mp->m_sb_lock);
3537 }
3538 if ((error = xfs_bmap_finish(&tp, &flist, &committed)))
3539 goto error2;
3540 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
3541 ASSERT(ip->i_df.if_ext_max ==
3542 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3543 return error;
3544 error2:
3545 xfs_bmap_cancel(&flist);
3546 error1:
3547 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3548 error0:
3549 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
3550 ASSERT(ip->i_df.if_ext_max ==
3551 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3552 return error;
3553 }
3554
3555 /*
3556 * Add the extent to the list of extents to be free at transaction end.
3557 * The list is maintained sorted (by block number).
3558 */
3559 /* ARGSUSED */
3560 void
3561 xfs_bmap_add_free(
3562 xfs_fsblock_t bno, /* fs block number of extent */
3563 xfs_filblks_t len, /* length of extent */
3564 xfs_bmap_free_t *flist, /* list of extents */
3565 xfs_mount_t *mp) /* mount point structure */
3566 {
3567 xfs_bmap_free_item_t *cur; /* current (next) element */
3568 xfs_bmap_free_item_t *new; /* new element */
3569 xfs_bmap_free_item_t *prev; /* previous element */
3570 #ifdef DEBUG
3571 xfs_agnumber_t agno;
3572 xfs_agblock_t agbno;
3573
3574 ASSERT(bno != NULLFSBLOCK);
3575 ASSERT(len > 0);
3576 ASSERT(len <= MAXEXTLEN);
3577 ASSERT(!isnullstartblock(bno));
3578 agno = XFS_FSB_TO_AGNO(mp, bno);
3579 agbno = XFS_FSB_TO_AGBNO(mp, bno);
3580 ASSERT(agno < mp->m_sb.sb_agcount);
3581 ASSERT(agbno < mp->m_sb.sb_agblocks);
3582 ASSERT(len < mp->m_sb.sb_agblocks);
3583 ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
3584 #endif
3585 ASSERT(xfs_bmap_free_item_zone != NULL);
3586 new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
3587 new->xbfi_startblock = bno;
3588 new->xbfi_blockcount = (xfs_extlen_t)len;
3589 for (prev = NULL, cur = flist->xbf_first;
3590 cur != NULL;
3591 prev = cur, cur = cur->xbfi_next) {
3592 if (cur->xbfi_startblock >= bno)
3593 break;
3594 }
3595 if (prev)
3596 prev->xbfi_next = new;
3597 else
3598 flist->xbf_first = new;
3599 new->xbfi_next = cur;
3600 flist->xbf_count++;
3601 }
3602
3603 /*
3604 * Compute and fill in the value of the maximum depth of a bmap btree
3605 * in this filesystem. Done once, during mount.
3606 */
3607 void
3608 xfs_bmap_compute_maxlevels(
3609 xfs_mount_t *mp, /* file system mount structure */
3610 int whichfork) /* data or attr fork */
3611 {
3612 int level; /* btree level */
3613 uint maxblocks; /* max blocks at this level */
3614 uint maxleafents; /* max leaf entries possible */
3615 int maxrootrecs; /* max records in root block */
3616 int minleafrecs; /* min records in leaf block */
3617 int minnoderecs; /* min records in node block */
3618 int sz; /* root block size */
3619
3620 /*
3621 * The maximum number of extents in a file, hence the maximum
3622 * number of leaf entries, is controlled by the type of di_nextents
3623 * (a signed 32-bit number, xfs_extnum_t), or by di_anextents
3624 * (a signed 16-bit number, xfs_aextnum_t).
3625 *
3626 * Note that we can no longer assume that if we are in ATTR1 that
3627 * the fork offset of all the inodes will be
3628 * (xfs_default_attroffset(ip) >> 3) because we could have mounted
3629 * with ATTR2 and then mounted back with ATTR1, keeping the
3630 * di_forkoff's fixed but probably at various positions. Therefore,
3631 * for both ATTR1 and ATTR2 we have to assume the worst case scenario
3632 * of a minimum size available.
3633 */
3634 if (whichfork == XFS_DATA_FORK) {
3635 maxleafents = MAXEXTNUM;
3636 sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
3637 } else {
3638 maxleafents = MAXAEXTNUM;
3639 sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
3640 }
3641 maxrootrecs = xfs_bmdr_maxrecs(mp, sz, 0);
3642 minleafrecs = mp->m_bmap_dmnr[0];
3643 minnoderecs = mp->m_bmap_dmnr[1];
3644 maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
3645 for (level = 1; maxblocks > 1; level++) {
3646 if (maxblocks <= maxrootrecs)
3647 maxblocks = 1;
3648 else
3649 maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
3650 }
3651 mp->m_bm_maxlevels[whichfork] = level;
3652 }
3653
3654 /*
3655 * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
3656 * caller. Frees all the extents that need freeing, which must be done
3657 * last due to locking considerations. We never free any extents in
3658 * the first transaction.
3659 *
3660 * Return 1 if the given transaction was committed and a new one
3661 * started, and 0 otherwise in the committed parameter.
3662 */
3663 int /* error */
3664 xfs_bmap_finish(
3665 xfs_trans_t **tp, /* transaction pointer addr */
3666 xfs_bmap_free_t *flist, /* i/o: list extents to free */
3667 int *committed) /* xact committed or not */
3668 {
3669 xfs_efd_log_item_t *efd; /* extent free data */
3670 xfs_efi_log_item_t *efi; /* extent free intention */
3671 int error; /* error return value */
3672 xfs_bmap_free_item_t *free; /* free extent item */
3673 unsigned int logres; /* new log reservation */
3674 unsigned int logcount; /* new log count */
3675 xfs_mount_t *mp; /* filesystem mount structure */
3676 xfs_bmap_free_item_t *next; /* next item on free list */
3677 xfs_trans_t *ntp; /* new transaction pointer */
3678
3679 ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
3680 if (flist->xbf_count == 0) {
3681 *committed = 0;
3682 return 0;
3683 }
3684 ntp = *tp;
3685 efi = xfs_trans_get_efi(ntp, flist->xbf_count);
3686 for (free = flist->xbf_first; free; free = free->xbfi_next)
3687 xfs_trans_log_efi_extent(ntp, efi, free->xbfi_startblock,
3688 free->xbfi_blockcount);
3689 logres = ntp->t_log_res;
3690 logcount = ntp->t_log_count;
3691 ntp = xfs_trans_dup(*tp);
3692 error = xfs_trans_commit(*tp, 0);
3693 *tp = ntp;
3694 *committed = 1;
3695 /*
3696 * We have a new transaction, so we should return committed=1,
3697 * even though we're returning an error.
3698 */
3699 if (error)
3700 return error;
3701
3702 /*
3703 * transaction commit worked ok so we can drop the extra ticket
3704 * reference that we gained in xfs_trans_dup()
3705 */
3706 xfs_log_ticket_put(ntp->t_ticket);
3707
3708 if ((error = xfs_trans_reserve(ntp, 0, logres, 0, XFS_TRANS_PERM_LOG_RES,
3709 logcount)))
3710 return error;
3711 efd = xfs_trans_get_efd(ntp, efi, flist->xbf_count);
3712 for (free = flist->xbf_first; free != NULL; free = next) {
3713 next = free->xbfi_next;
3714 if ((error = xfs_free_extent(ntp, free->xbfi_startblock,
3715 free->xbfi_blockcount))) {
3716 /*
3717 * The bmap free list will be cleaned up at a
3718 * higher level. The EFI will be canceled when
3719 * this transaction is aborted.
3720 * Need to force shutdown here to make sure it
3721 * happens, since this transaction may not be
3722 * dirty yet.
3723 */
3724 mp = ntp->t_mountp;
3725 if (!XFS_FORCED_SHUTDOWN(mp))
3726 xfs_force_shutdown(mp,
3727 (error == EFSCORRUPTED) ?
3728 SHUTDOWN_CORRUPT_INCORE :
3729 SHUTDOWN_META_IO_ERROR);
3730 return error;
3731 }
3732 xfs_trans_log_efd_extent(ntp, efd, free->xbfi_startblock,
3733 free->xbfi_blockcount);
3734 xfs_bmap_del_free(flist, NULL, free);
3735 }
3736 return 0;
3737 }
3738
3739 /*
3740 * Free up any items left in the list.
3741 */
3742 void
3743 xfs_bmap_cancel(
3744 xfs_bmap_free_t *flist) /* list of bmap_free_items */
3745 {
3746 xfs_bmap_free_item_t *free; /* free list item */
3747 xfs_bmap_free_item_t *next;
3748
3749 if (flist->xbf_count == 0)
3750 return;
3751 ASSERT(flist->xbf_first != NULL);
3752 for (free = flist->xbf_first; free; free = next) {
3753 next = free->xbfi_next;
3754 xfs_bmap_del_free(flist, NULL, free);
3755 }
3756 ASSERT(flist->xbf_count == 0);
3757 }
3758
3759 /*
3760 * Returns the file-relative block number of the first unused block(s)
3761 * in the file with at least "len" logically contiguous blocks free.
3762 * This is the lowest-address hole if the file has holes, else the first block
3763 * past the end of file.
3764 * Return 0 if the file is currently local (in-inode).
3765 */
3766 int /* error */
3767 xfs_bmap_first_unused(
3768 xfs_trans_t *tp, /* transaction pointer */
3769 xfs_inode_t *ip, /* incore inode */
3770 xfs_extlen_t len, /* size of hole to find */
3771 xfs_fileoff_t *first_unused, /* unused block */
3772 int whichfork) /* data or attr fork */
3773 {
3774 int error; /* error return value */
3775 int idx; /* extent record index */
3776 xfs_ifork_t *ifp; /* inode fork pointer */
3777 xfs_fileoff_t lastaddr; /* last block number seen */
3778 xfs_fileoff_t lowest; /* lowest useful block */
3779 xfs_fileoff_t max; /* starting useful block */
3780 xfs_fileoff_t off; /* offset for this block */
3781 xfs_extnum_t nextents; /* number of extent entries */
3782
3783 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
3784 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
3785 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
3786 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
3787 *first_unused = 0;
3788 return 0;
3789 }
3790 ifp = XFS_IFORK_PTR(ip, whichfork);
3791 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
3792 (error = xfs_iread_extents(tp, ip, whichfork)))
3793 return error;
3794 lowest = *first_unused;
3795 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3796 for (idx = 0, lastaddr = 0, max = lowest; idx < nextents; idx++) {
3797 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
3798 off = xfs_bmbt_get_startoff(ep);
3799 /*
3800 * See if the hole before this extent will work.
3801 */
3802 if (off >= lowest + len && off - max >= len) {
3803 *first_unused = max;
3804 return 0;
3805 }
3806 lastaddr = off + xfs_bmbt_get_blockcount(ep);
3807 max = XFS_FILEOFF_MAX(lastaddr, lowest);
3808 }
3809 *first_unused = max;
3810 return 0;
3811 }
3812
3813 /*
3814 * Returns the file-relative block number of the last block + 1 before
3815 * last_block (input value) in the file.
3816 * This is not based on i_size, it is based on the extent records.
3817 * Returns 0 for local files, as they do not have extent records.
3818 */
3819 int /* error */
3820 xfs_bmap_last_before(
3821 xfs_trans_t *tp, /* transaction pointer */
3822 xfs_inode_t *ip, /* incore inode */
3823 xfs_fileoff_t *last_block, /* last block */
3824 int whichfork) /* data or attr fork */
3825 {
3826 xfs_fileoff_t bno; /* input file offset */
3827 int eof; /* hit end of file */
3828 xfs_bmbt_rec_host_t *ep; /* pointer to last extent */
3829 int error; /* error return value */
3830 xfs_bmbt_irec_t got; /* current extent value */
3831 xfs_ifork_t *ifp; /* inode fork pointer */
3832 xfs_extnum_t lastx; /* last extent used */
3833 xfs_bmbt_irec_t prev; /* previous extent value */
3834
3835 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
3836 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
3837 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
3838 return XFS_ERROR(EIO);
3839 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
3840 *last_block = 0;
3841 return 0;
3842 }
3843 ifp = XFS_IFORK_PTR(ip, whichfork);
3844 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
3845 (error = xfs_iread_extents(tp, ip, whichfork)))
3846 return error;
3847 bno = *last_block - 1;
3848 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
3849 &prev);
3850 if (eof || xfs_bmbt_get_startoff(ep) > bno) {
3851 if (prev.br_startoff == NULLFILEOFF)
3852 *last_block = 0;
3853 else
3854 *last_block = prev.br_startoff + prev.br_blockcount;
3855 }
3856 /*
3857 * Otherwise *last_block is already the right answer.
3858 */
3859 return 0;
3860 }
3861
3862 STATIC int
3863 xfs_bmap_last_extent(
3864 struct xfs_trans *tp,
3865 struct xfs_inode *ip,
3866 int whichfork,
3867 struct xfs_bmbt_irec *rec,
3868 int *is_empty)
3869 {
3870 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
3871 int error;
3872 int nextents;
3873
3874 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
3875 error = xfs_iread_extents(tp, ip, whichfork);
3876 if (error)
3877 return error;
3878 }
3879
3880 nextents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t);
3881 if (nextents == 0) {
3882 *is_empty = 1;
3883 return 0;
3884 }
3885
3886 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, nextents - 1), rec);
3887 *is_empty = 0;
3888 return 0;
3889 }
3890
3891 /*
3892 * Check the last inode extent to determine whether this allocation will result
3893 * in blocks being allocated at the end of the file. When we allocate new data
3894 * blocks at the end of the file which do not start at the previous data block,
3895 * we will try to align the new blocks at stripe unit boundaries.
3896 *
3897 * Returns 0 in bma->aeof if the file (fork) is empty as any new write will be
3898 * at, or past the EOF.
3899 */
3900 STATIC int
3901 xfs_bmap_isaeof(
3902 struct xfs_bmalloca *bma,
3903 int whichfork)
3904 {
3905 struct xfs_bmbt_irec rec;
3906 int is_empty;
3907 int error;
3908
3909 bma->aeof = 0;
3910 error = xfs_bmap_last_extent(NULL, bma->ip, whichfork, &rec,
3911 &is_empty);
3912 if (error || is_empty)
3913 return error;
3914
3915 /*
3916 * Check if we are allocation or past the last extent, or at least into
3917 * the last delayed allocated extent.
3918 */
3919 bma->aeof = bma->offset >= rec.br_startoff + rec.br_blockcount ||
3920 (bma->offset >= rec.br_startoff &&
3921 isnullstartblock(rec.br_startblock));
3922 return 0;
3923 }
3924
3925 /*
3926 * Check if the endoff is outside the last extent. If so the caller will grow
3927 * the allocation to a stripe unit boundary. All offsets are considered outside
3928 * the end of file for an empty fork, so 1 is returned in *eof in that case.
3929 */
3930 int
3931 xfs_bmap_eof(
3932 struct xfs_inode *ip,
3933 xfs_fileoff_t endoff,
3934 int whichfork,
3935 int *eof)
3936 {
3937 struct xfs_bmbt_irec rec;
3938 int error;
3939
3940 error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, eof);
3941 if (error || *eof)
3942 return error;
3943
3944 *eof = endoff >= rec.br_startoff + rec.br_blockcount;
3945 return 0;
3946 }
3947
3948 /*
3949 * Returns the file-relative block number of the first block past eof in
3950 * the file. This is not based on i_size, it is based on the extent records.
3951 * Returns 0 for local files, as they do not have extent records.
3952 */
3953 int
3954 xfs_bmap_last_offset(
3955 struct xfs_trans *tp,
3956 struct xfs_inode *ip,
3957 xfs_fileoff_t *last_block,
3958 int whichfork)
3959 {
3960 struct xfs_bmbt_irec rec;
3961 int is_empty;
3962 int error;
3963
3964 *last_block = 0;
3965
3966 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL)
3967 return 0;
3968
3969 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
3970 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
3971 return XFS_ERROR(EIO);
3972
3973 error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, &is_empty);
3974 if (error || is_empty)
3975 return error;
3976
3977 *last_block = rec.br_startoff + rec.br_blockcount;
3978 return 0;
3979 }
3980
3981 /*
3982 * Returns whether the selected fork of the inode has exactly one
3983 * block or not. For the data fork we check this matches di_size,
3984 * implying the file's range is 0..bsize-1.
3985 */
3986 int /* 1=>1 block, 0=>otherwise */
3987 xfs_bmap_one_block(
3988 xfs_inode_t *ip, /* incore inode */
3989 int whichfork) /* data or attr fork */
3990 {
3991 xfs_bmbt_rec_host_t *ep; /* ptr to fork's extent */
3992 xfs_ifork_t *ifp; /* inode fork pointer */
3993 int rval; /* return value */
3994 xfs_bmbt_irec_t s; /* internal version of extent */
3995
3996 #ifndef DEBUG
3997 if (whichfork == XFS_DATA_FORK) {
3998 return S_ISREG(ip->i_d.di_mode) ?
3999 (ip->i_size == ip->i_mount->m_sb.sb_blocksize) :
4000 (ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize);
4001 }
4002 #endif /* !DEBUG */
4003 if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
4004 return 0;
4005 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
4006 return 0;
4007 ifp = XFS_IFORK_PTR(ip, whichfork);
4008 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
4009 ep = xfs_iext_get_ext(ifp, 0);
4010 xfs_bmbt_get_all(ep, &s);
4011 rval = s.br_startoff == 0 && s.br_blockcount == 1;
4012 if (rval && whichfork == XFS_DATA_FORK)
4013 ASSERT(ip->i_size == ip->i_mount->m_sb.sb_blocksize);
4014 return rval;
4015 }
4016
4017 STATIC int
4018 xfs_bmap_sanity_check(
4019 struct xfs_mount *mp,
4020 struct xfs_buf *bp,
4021 int level)
4022 {
4023 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
4024
4025 if (block->bb_magic != cpu_to_be32(XFS_BMAP_MAGIC) ||
4026 be16_to_cpu(block->bb_level) != level ||
4027 be16_to_cpu(block->bb_numrecs) == 0 ||
4028 be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
4029 return 0;
4030 return 1;
4031 }
4032
4033 /*
4034 * Read in the extents to if_extents.
4035 * All inode fields are set up by caller, we just traverse the btree
4036 * and copy the records in. If the file system cannot contain unwritten
4037 * extents, the records are checked for no "state" flags.
4038 */
4039 int /* error */
4040 xfs_bmap_read_extents(
4041 xfs_trans_t *tp, /* transaction pointer */
4042 xfs_inode_t *ip, /* incore inode */
4043 int whichfork) /* data or attr fork */
4044 {
4045 struct xfs_btree_block *block; /* current btree block */
4046 xfs_fsblock_t bno; /* block # of "block" */
4047 xfs_buf_t *bp; /* buffer for "block" */
4048 int error; /* error return value */
4049 xfs_exntfmt_t exntf; /* XFS_EXTFMT_NOSTATE, if checking */
4050 xfs_extnum_t i, j; /* index into the extents list */
4051 xfs_ifork_t *ifp; /* fork structure */
4052 int level; /* btree level, for checking */
4053 xfs_mount_t *mp; /* file system mount structure */
4054 __be64 *pp; /* pointer to block address */
4055 /* REFERENCED */
4056 xfs_extnum_t room; /* number of entries there's room for */
4057
4058 bno = NULLFSBLOCK;
4059 mp = ip->i_mount;
4060 ifp = XFS_IFORK_PTR(ip, whichfork);
4061 exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE :
4062 XFS_EXTFMT_INODE(ip);
4063 block = ifp->if_broot;
4064 /*
4065 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
4066 */
4067 level = be16_to_cpu(block->bb_level);
4068 ASSERT(level > 0);
4069 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
4070 bno = be64_to_cpu(*pp);
4071 ASSERT(bno != NULLDFSBNO);
4072 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
4073 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
4074 /*
4075 * Go down the tree until leaf level is reached, following the first
4076 * pointer (leftmost) at each level.
4077 */
4078 while (level-- > 0) {
4079 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4080 XFS_BMAP_BTREE_REF)))
4081 return error;
4082 block = XFS_BUF_TO_BLOCK(bp);
4083 XFS_WANT_CORRUPTED_GOTO(
4084 xfs_bmap_sanity_check(mp, bp, level),
4085 error0);
4086 if (level == 0)
4087 break;
4088 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
4089 bno = be64_to_cpu(*pp);
4090 XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
4091 xfs_trans_brelse(tp, bp);
4092 }
4093 /*
4094 * Here with bp and block set to the leftmost leaf node in the tree.
4095 */
4096 room = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4097 i = 0;
4098 /*
4099 * Loop over all leaf nodes. Copy information to the extent records.
4100 */
4101 for (;;) {
4102 xfs_bmbt_rec_t *frp;
4103 xfs_fsblock_t nextbno;
4104 xfs_extnum_t num_recs;
4105 xfs_extnum_t start;
4106
4107 num_recs = xfs_btree_get_numrecs(block);
4108 if (unlikely(i + num_recs > room)) {
4109 ASSERT(i + num_recs <= room);
4110 xfs_warn(ip->i_mount,
4111 "corrupt dinode %Lu, (btree extents).",
4112 (unsigned long long) ip->i_ino);
4113 XFS_CORRUPTION_ERROR("xfs_bmap_read_extents(1)",
4114 XFS_ERRLEVEL_LOW, ip->i_mount, block);
4115 goto error0;
4116 }
4117 XFS_WANT_CORRUPTED_GOTO(
4118 xfs_bmap_sanity_check(mp, bp, 0),
4119 error0);
4120 /*
4121 * Read-ahead the next leaf block, if any.
4122 */
4123 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
4124 if (nextbno != NULLFSBLOCK)
4125 xfs_btree_reada_bufl(mp, nextbno, 1);
4126 /*
4127 * Copy records into the extent records.
4128 */
4129 frp = XFS_BMBT_REC_ADDR(mp, block, 1);
4130 start = i;
4131 for (j = 0; j < num_recs; j++, i++, frp++) {
4132 xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i);
4133 trp->l0 = be64_to_cpu(frp->l0);
4134 trp->l1 = be64_to_cpu(frp->l1);
4135 }
4136 if (exntf == XFS_EXTFMT_NOSTATE) {
4137 /*
4138 * Check all attribute bmap btree records and
4139 * any "older" data bmap btree records for a
4140 * set bit in the "extent flag" position.
4141 */
4142 if (unlikely(xfs_check_nostate_extents(ifp,
4143 start, num_recs))) {
4144 XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
4145 XFS_ERRLEVEL_LOW,
4146 ip->i_mount);
4147 goto error0;
4148 }
4149 }
4150 xfs_trans_brelse(tp, bp);
4151 bno = nextbno;
4152 /*
4153 * If we've reached the end, stop.
4154 */
4155 if (bno == NULLFSBLOCK)
4156 break;
4157 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4158 XFS_BMAP_BTREE_REF)))
4159 return error;
4160 block = XFS_BUF_TO_BLOCK(bp);
4161 }
4162 ASSERT(i == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
4163 ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork));
4164 XFS_BMAP_TRACE_EXLIST(ip, i, whichfork);
4165 return 0;
4166 error0:
4167 xfs_trans_brelse(tp, bp);
4168 return XFS_ERROR(EFSCORRUPTED);
4169 }
4170
4171 #ifdef DEBUG
4172 /*
4173 * Add bmap trace insert entries for all the contents of the extent records.
4174 */
4175 void
4176 xfs_bmap_trace_exlist(
4177 xfs_inode_t *ip, /* incore inode pointer */
4178 xfs_extnum_t cnt, /* count of entries in the list */
4179 int whichfork, /* data or attr fork */
4180 unsigned long caller_ip)
4181 {
4182 xfs_extnum_t idx; /* extent record index */
4183 xfs_ifork_t *ifp; /* inode fork pointer */
4184 int state = 0;
4185
4186 if (whichfork == XFS_ATTR_FORK)
4187 state |= BMAP_ATTRFORK;
4188
4189 ifp = XFS_IFORK_PTR(ip, whichfork);
4190 ASSERT(cnt == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
4191 for (idx = 0; idx < cnt; idx++)
4192 trace_xfs_extlist(ip, idx, whichfork, caller_ip);
4193 }
4194
4195 /*
4196 * Validate that the bmbt_irecs being returned from bmapi are valid
4197 * given the callers original parameters. Specifically check the
4198 * ranges of the returned irecs to ensure that they only extent beyond
4199 * the given parameters if the XFS_BMAPI_ENTIRE flag was set.
4200 */
4201 STATIC void
4202 xfs_bmap_validate_ret(
4203 xfs_fileoff_t bno,
4204 xfs_filblks_t len,
4205 int flags,
4206 xfs_bmbt_irec_t *mval,
4207 int nmap,
4208 int ret_nmap)
4209 {
4210 int i; /* index to map values */
4211
4212 ASSERT(ret_nmap <= nmap);
4213
4214 for (i = 0; i < ret_nmap; i++) {
4215 ASSERT(mval[i].br_blockcount > 0);
4216 if (!(flags & XFS_BMAPI_ENTIRE)) {
4217 ASSERT(mval[i].br_startoff >= bno);
4218 ASSERT(mval[i].br_blockcount <= len);
4219 ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
4220 bno + len);
4221 } else {
4222 ASSERT(mval[i].br_startoff < bno + len);
4223 ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
4224 bno);
4225 }
4226 ASSERT(i == 0 ||
4227 mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
4228 mval[i].br_startoff);
4229 ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
4230 mval[i].br_startblock != HOLESTARTBLOCK);
4231 ASSERT(mval[i].br_state == XFS_EXT_NORM ||
4232 mval[i].br_state == XFS_EXT_UNWRITTEN);
4233 }
4234 }
4235 #endif /* DEBUG */
4236
4237
4238 /*
4239 * Trim the returned map to the required bounds
4240 */
4241 STATIC void
4242 xfs_bmapi_trim_map(
4243 struct xfs_bmbt_irec *mval,
4244 struct xfs_bmbt_irec *got,
4245 xfs_fileoff_t *bno,
4246 xfs_filblks_t len,
4247 xfs_fileoff_t obno,
4248 xfs_fileoff_t end,
4249 int n,
4250 int flags)
4251 {
4252 if ((flags & XFS_BMAPI_ENTIRE) ||
4253 got->br_startoff + got->br_blockcount <= obno) {
4254 *mval = *got;
4255 if (isnullstartblock(got->br_startblock))
4256 mval->br_startblock = DELAYSTARTBLOCK;
4257 return;
4258 }
4259
4260 if (obno > *bno)
4261 *bno = obno;
4262 ASSERT((*bno >= obno) || (n == 0));
4263 ASSERT(*bno < end);
4264 mval->br_startoff = *bno;
4265 if (isnullstartblock(got->br_startblock))
4266 mval->br_startblock = DELAYSTARTBLOCK;
4267 else
4268 mval->br_startblock = got->br_startblock +
4269 (*bno - got->br_startoff);
4270 /*
4271 * Return the minimum of what we got and what we asked for for
4272 * the length. We can use the len variable here because it is
4273 * modified below and we could have been there before coming
4274 * here if the first part of the allocation didn't overlap what
4275 * was asked for.
4276 */
4277 mval->br_blockcount = XFS_FILBLKS_MIN(end - *bno,
4278 got->br_blockcount - (*bno - got->br_startoff));
4279 mval->br_state = got->br_state;
4280 ASSERT(mval->br_blockcount <= len);
4281 return;
4282 }
4283
4284 /*
4285 * Update and validate the extent map to return
4286 */
4287 STATIC void
4288 xfs_bmapi_update_map(
4289 struct xfs_bmbt_irec **map,
4290 xfs_fileoff_t *bno,
4291 xfs_filblks_t *len,
4292 xfs_fileoff_t obno,
4293 xfs_fileoff_t end,
4294 int *n,
4295 int flags)
4296 {
4297 xfs_bmbt_irec_t *mval = *map;
4298
4299 ASSERT((flags & XFS_BMAPI_ENTIRE) ||
4300 ((mval->br_startoff + mval->br_blockcount) <= end));
4301 ASSERT((flags & XFS_BMAPI_ENTIRE) || (mval->br_blockcount <= *len) ||
4302 (mval->br_startoff < obno));
4303
4304 *bno = mval->br_startoff + mval->br_blockcount;
4305 *len = end - *bno;
4306 if (*n > 0 && mval->br_startoff == mval[-1].br_startoff) {
4307 /* update previous map with new information */
4308 ASSERT(mval->br_startblock == mval[-1].br_startblock);
4309 ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
4310 ASSERT(mval->br_state == mval[-1].br_state);
4311 mval[-1].br_blockcount = mval->br_blockcount;
4312 mval[-1].br_state = mval->br_state;
4313 } else if (*n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
4314 mval[-1].br_startblock != DELAYSTARTBLOCK &&
4315 mval[-1].br_startblock != HOLESTARTBLOCK &&
4316 mval->br_startblock == mval[-1].br_startblock +
4317 mval[-1].br_blockcount &&
4318 ((flags & XFS_BMAPI_IGSTATE) ||
4319 mval[-1].br_state == mval->br_state)) {
4320 ASSERT(mval->br_startoff ==
4321 mval[-1].br_startoff + mval[-1].br_blockcount);
4322 mval[-1].br_blockcount += mval->br_blockcount;
4323 } else if (*n > 0 &&
4324 mval->br_startblock == DELAYSTARTBLOCK &&
4325 mval[-1].br_startblock == DELAYSTARTBLOCK &&
4326 mval->br_startoff ==
4327 mval[-1].br_startoff + mval[-1].br_blockcount) {
4328 mval[-1].br_blockcount += mval->br_blockcount;
4329 mval[-1].br_state = mval->br_state;
4330 } else if (!((*n == 0) &&
4331 ((mval->br_startoff + mval->br_blockcount) <=
4332 obno))) {
4333 mval++;
4334 (*n)++;
4335 }
4336 *map = mval;
4337 }
4338
4339 /*
4340 * Map file blocks to filesystem blocks without allocation.
4341 */
4342 int
4343 xfs_bmapi_read(
4344 struct xfs_inode *ip,
4345 xfs_fileoff_t bno,
4346 xfs_filblks_t len,
4347 struct xfs_bmbt_irec *mval,
4348 int *nmap,
4349 int flags)
4350 {
4351 struct xfs_mount *mp = ip->i_mount;
4352 struct xfs_ifork *ifp;
4353 struct xfs_bmbt_irec got;
4354 struct xfs_bmbt_irec prev;
4355 xfs_fileoff_t obno;
4356 xfs_fileoff_t end;
4357 xfs_extnum_t lastx;
4358 int error;
4359 int eof;
4360 int n = 0;
4361 int whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4362 XFS_ATTR_FORK : XFS_DATA_FORK;
4363
4364 ASSERT(*nmap >= 1);
4365 ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK|XFS_BMAPI_ENTIRE|
4366 XFS_BMAPI_IGSTATE)));
4367
4368 if (unlikely(XFS_TEST_ERROR(
4369 (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4370 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
4371 mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
4372 XFS_ERROR_REPORT("xfs_bmapi_read", XFS_ERRLEVEL_LOW, mp);
4373 return XFS_ERROR(EFSCORRUPTED);
4374 }
4375
4376 if (XFS_FORCED_SHUTDOWN(mp))
4377 return XFS_ERROR(EIO);
4378
4379 XFS_STATS_INC(xs_blk_mapr);
4380
4381 ifp = XFS_IFORK_PTR(ip, whichfork);
4382 ASSERT(ifp->if_ext_max ==
4383 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
4384
4385 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
4386 error = xfs_iread_extents(NULL, ip, whichfork);
4387 if (error)
4388 return error;
4389 }
4390
4391 xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got, &prev);
4392 end = bno + len;
4393 obno = bno;
4394
4395 while (bno < end && n < *nmap) {
4396 /* Reading past eof, act as though there's a hole up to end. */
4397 if (eof)
4398 got.br_startoff = end;
4399 if (got.br_startoff > bno) {
4400 /* Reading in a hole. */
4401 mval->br_startoff = bno;
4402 mval->br_startblock = HOLESTARTBLOCK;
4403 mval->br_blockcount =
4404 XFS_FILBLKS_MIN(len, got.br_startoff - bno);
4405 mval->br_state = XFS_EXT_NORM;
4406 bno += mval->br_blockcount;
4407 len -= mval->br_blockcount;
4408 mval++;
4409 n++;
4410 continue;
4411 }
4412
4413 /* set up the extent map to return. */
4414 xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags);
4415 xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
4416
4417 /* If we're done, stop now. */
4418 if (bno >= end || n >= *nmap)
4419 break;
4420
4421 /* Else go on to the next record. */
4422 if (++lastx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t))
4423 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx), &got);
4424 else
4425 eof = 1;
4426 }
4427 *nmap = n;
4428 return 0;
4429 }
4430
4431 STATIC int
4432 xfs_bmapi_reserve_delalloc(
4433 struct xfs_inode *ip,
4434 xfs_fileoff_t aoff,
4435 xfs_filblks_t len,
4436 struct xfs_bmbt_irec *got,
4437 struct xfs_bmbt_irec *prev,
4438 xfs_extnum_t *lastx,
4439 int eof)
4440 {
4441 struct xfs_mount *mp = ip->i_mount;
4442 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
4443 xfs_extlen_t alen;
4444 xfs_extlen_t indlen;
4445 char rt = XFS_IS_REALTIME_INODE(ip);
4446 xfs_extlen_t extsz;
4447 int error;
4448
4449 alen = XFS_FILBLKS_MIN(len, MAXEXTLEN);
4450 if (!eof)
4451 alen = XFS_FILBLKS_MIN(alen, got->br_startoff - aoff);
4452
4453 /* Figure out the extent size, adjust alen */
4454 extsz = xfs_get_extsz_hint(ip);
4455 if (extsz) {
4456 /*
4457 * Make sure we don't exceed a single extent length when we
4458 * align the extent by reducing length we are going to
4459 * allocate by the maximum amount extent size aligment may
4460 * require.
4461 */
4462 alen = XFS_FILBLKS_MIN(len, MAXEXTLEN - (2 * extsz - 1));
4463 error = xfs_bmap_extsize_align(mp, got, prev, extsz, rt, eof,
4464 1, 0, &aoff, &alen);
4465 ASSERT(!error);
4466 }
4467
4468 if (rt)
4469 extsz = alen / mp->m_sb.sb_rextsize;
4470
4471 /*
4472 * Make a transaction-less quota reservation for delayed allocation
4473 * blocks. This number gets adjusted later. We return if we haven't
4474 * allocated blocks already inside this loop.
4475 */
4476 error = xfs_trans_reserve_quota_nblks(NULL, ip, (long)alen, 0,
4477 rt ? XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
4478 if (error)
4479 return error;
4480
4481 /*
4482 * Split changing sb for alen and indlen since they could be coming
4483 * from different places.
4484 */
4485 indlen = (xfs_extlen_t)xfs_bmap_worst_indlen(ip, alen);
4486 ASSERT(indlen > 0);
4487
4488 if (rt) {
4489 error = xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
4490 -((int64_t)extsz), 0);
4491 } else {
4492 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
4493 -((int64_t)alen), 0);
4494 }
4495
4496 if (error)
4497 goto out_unreserve_quota;
4498
4499 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
4500 -((int64_t)indlen), 0);
4501 if (error)
4502 goto out_unreserve_blocks;
4503
4504
4505 ip->i_delayed_blks += alen;
4506
4507 got->br_startoff = aoff;
4508 got->br_startblock = nullstartblock(indlen);
4509 got->br_blockcount = alen;
4510 got->br_state = XFS_EXT_NORM;
4511 xfs_bmap_add_extent_hole_delay(ip, lastx, got);
4512
4513 /*
4514 * Update our extent pointer, given that xfs_bmap_add_extent_hole_delay
4515 * might have merged it into one of the neighbouring ones.
4516 */
4517 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *lastx), got);
4518
4519 ASSERT(got->br_startoff <= aoff);
4520 ASSERT(got->br_startoff + got->br_blockcount >= aoff + alen);
4521 ASSERT(isnullstartblock(got->br_startblock));
4522 ASSERT(got->br_state == XFS_EXT_NORM);
4523 return 0;
4524
4525 out_unreserve_blocks:
4526 if (rt)
4527 xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS, extsz, 0);
4528 else
4529 xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS, alen, 0);
4530 out_unreserve_quota:
4531 if (XFS_IS_QUOTA_ON(mp))
4532 xfs_trans_unreserve_quota_nblks(NULL, ip, alen, 0, rt ?
4533 XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
4534 return error;
4535 }
4536
4537 /*
4538 * Map file blocks to filesystem blocks, adding delayed allocations as needed.
4539 */
4540 int
4541 xfs_bmapi_delay(
4542 struct xfs_inode *ip, /* incore inode */
4543 xfs_fileoff_t bno, /* starting file offs. mapped */
4544 xfs_filblks_t len, /* length to map in file */
4545 struct xfs_bmbt_irec *mval, /* output: map values */
4546 int *nmap, /* i/o: mval size/count */
4547 int flags) /* XFS_BMAPI_... */
4548 {
4549 struct xfs_mount *mp = ip->i_mount;
4550 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
4551 struct xfs_bmbt_irec got; /* current file extent record */
4552 struct xfs_bmbt_irec prev; /* previous file extent record */
4553 xfs_fileoff_t obno; /* old block number (offset) */
4554 xfs_fileoff_t end; /* end of mapped file region */
4555 xfs_extnum_t lastx; /* last useful extent number */
4556 int eof; /* we've hit the end of extents */
4557 int n = 0; /* current extent index */
4558 int error = 0;
4559
4560 ASSERT(*nmap >= 1);
4561 ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
4562 ASSERT(!(flags & ~XFS_BMAPI_ENTIRE));
4563
4564 if (unlikely(XFS_TEST_ERROR(
4565 (XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_EXTENTS &&
4566 XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_BTREE),
4567 mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
4568 XFS_ERROR_REPORT("xfs_bmapi_delay", XFS_ERRLEVEL_LOW, mp);
4569 return XFS_ERROR(EFSCORRUPTED);
4570 }
4571
4572 if (XFS_FORCED_SHUTDOWN(mp))
4573 return XFS_ERROR(EIO);
4574
4575 XFS_STATS_INC(xs_blk_mapw);
4576
4577 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
4578 error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
4579 if (error)
4580 return error;
4581 }
4582
4583 xfs_bmap_search_extents(ip, bno, XFS_DATA_FORK, &eof, &lastx, &got, &prev);
4584 end = bno + len;
4585 obno = bno;
4586
4587 while (bno < end && n < *nmap) {
4588 if (eof || got.br_startoff > bno) {
4589 error = xfs_bmapi_reserve_delalloc(ip, bno, len, &got,
4590 &prev, &lastx, eof);
4591 if (error) {
4592 if (n == 0) {
4593 *nmap = 0;
4594 return error;
4595 }
4596 break;
4597 }
4598 }
4599
4600 /* set up the extent map to return. */
4601 xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags);
4602 xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
4603
4604 /* If we're done, stop now. */
4605 if (bno >= end || n >= *nmap)
4606 break;
4607
4608 /* Else go on to the next record. */
4609 prev = got;
4610 if (++lastx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t))
4611 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx), &got);
4612 else
4613 eof = 1;
4614 }
4615
4616 *nmap = n;
4617 return 0;
4618 }
4619
4620
4621 STATIC int
4622 xfs_bmapi_allocate(
4623 struct xfs_bmalloca *bma,
4624 int flags)
4625 {
4626 struct xfs_mount *mp = bma->ip->i_mount;
4627 int whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4628 XFS_ATTR_FORK : XFS_DATA_FORK;
4629 struct xfs_ifork *ifp = XFS_IFORK_PTR(bma->ip, whichfork);
4630 int tmp_logflags = 0;
4631 int error;
4632 int rt;
4633
4634 ASSERT(bma->length > 0);
4635
4636 rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(bma->ip);
4637
4638 /*
4639 * For the wasdelay case, we could also just allocate the stuff asked
4640 * for in this bmap call but that wouldn't be as good.
4641 */
4642 if (bma->wasdel) {
4643 bma->length = (xfs_extlen_t)bma->got.br_blockcount;
4644 bma->offset = bma->got.br_startoff;
4645 if (bma->idx != NULLEXTNUM && bma->idx) {
4646 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1),
4647 &bma->prev);
4648 }
4649 } else {
4650 bma->length = XFS_FILBLKS_MIN(bma->length, MAXEXTLEN);
4651 if (!bma->eof)
4652 bma->length = XFS_FILBLKS_MIN(bma->length,
4653 bma->got.br_startoff - bma->offset);
4654 }
4655
4656 /*
4657 * Indicate if this is the first user data in the file, or just any
4658 * user data.
4659 */
4660 if (!(flags & XFS_BMAPI_METADATA)) {
4661 bma->userdata = (bma->offset == 0) ?
4662 XFS_ALLOC_INITIAL_USER_DATA : XFS_ALLOC_USERDATA;
4663 }
4664
4665 bma->minlen = (flags & XFS_BMAPI_CONTIG) ? bma->length : 1;
4666
4667 /*
4668 * Only want to do the alignment at the eof if it is userdata and
4669 * allocation length is larger than a stripe unit.
4670 */
4671 if (mp->m_dalign && bma->length >= mp->m_dalign &&
4672 !(flags & XFS_BMAPI_METADATA) && whichfork == XFS_DATA_FORK) {
4673 error = xfs_bmap_isaeof(bma, whichfork);
4674 if (error)
4675 return error;
4676 }
4677
4678 error = xfs_bmap_alloc(bma);
4679 if (error)
4680 return error;
4681
4682 if (bma->flist->xbf_low)
4683 bma->minleft = 0;
4684 if (bma->cur)
4685 bma->cur->bc_private.b.firstblock = *bma->firstblock;
4686 if (bma->blkno == NULLFSBLOCK)
4687 return 0;
4688 if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) {
4689 bma->cur = xfs_bmbt_init_cursor(mp, bma->tp, bma->ip, whichfork);
4690 bma->cur->bc_private.b.firstblock = *bma->firstblock;
4691 bma->cur->bc_private.b.flist = bma->flist;
4692 }
4693 /*
4694 * Bump the number of extents we've allocated
4695 * in this call.
4696 */
4697 bma->nallocs++;
4698
4699 if (bma->cur)
4700 bma->cur->bc_private.b.flags =
4701 bma->wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
4702
4703 bma->got.br_startoff = bma->offset;
4704 bma->got.br_startblock = bma->blkno;
4705 bma->got.br_blockcount = bma->length;
4706 bma->got.br_state = XFS_EXT_NORM;
4707
4708 /*
4709 * A wasdelay extent has been initialized, so shouldn't be flagged
4710 * as unwritten.
4711 */
4712 if (!bma->wasdel && (flags & XFS_BMAPI_PREALLOC) &&
4713 xfs_sb_version_hasextflgbit(&mp->m_sb))
4714 bma->got.br_state = XFS_EXT_UNWRITTEN;
4715
4716 if (bma->wasdel)
4717 error = xfs_bmap_add_extent_delay_real(bma);
4718 else
4719 error = xfs_bmap_add_extent_hole_real(bma, whichfork);
4720
4721 bma->logflags |= tmp_logflags;
4722 if (error)
4723 return error;
4724
4725 /*
4726 * Update our extent pointer, given that xfs_bmap_add_extent_delay_real
4727 * or xfs_bmap_add_extent_hole_real might have merged it into one of
4728 * the neighbouring ones.
4729 */
4730 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &bma->got);
4731
4732 ASSERT(bma->got.br_startoff <= bma->offset);
4733 ASSERT(bma->got.br_startoff + bma->got.br_blockcount >=
4734 bma->offset + bma->length);
4735 ASSERT(bma->got.br_state == XFS_EXT_NORM ||
4736 bma->got.br_state == XFS_EXT_UNWRITTEN);
4737 return 0;
4738 }
4739
4740 STATIC int
4741 xfs_bmapi_convert_unwritten(
4742 struct xfs_bmalloca *bma,
4743 struct xfs_bmbt_irec *mval,
4744 xfs_filblks_t len,
4745 int flags)
4746 {
4747 int whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4748 XFS_ATTR_FORK : XFS_DATA_FORK;
4749 struct xfs_ifork *ifp = XFS_IFORK_PTR(bma->ip, whichfork);
4750 int tmp_logflags = 0;
4751 int error;
4752
4753 /* check if we need to do unwritten->real conversion */
4754 if (mval->br_state == XFS_EXT_UNWRITTEN &&
4755 (flags & XFS_BMAPI_PREALLOC))
4756 return 0;
4757
4758 /* check if we need to do real->unwritten conversion */
4759 if (mval->br_state == XFS_EXT_NORM &&
4760 (flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT)) !=
4761 (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT))
4762 return 0;
4763
4764 /*
4765 * Modify (by adding) the state flag, if writing.
4766 */
4767 ASSERT(mval->br_blockcount <= len);
4768 if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) {
4769 bma->cur = xfs_bmbt_init_cursor(bma->ip->i_mount, bma->tp,
4770 bma->ip, whichfork);
4771 bma->cur->bc_private.b.firstblock = *bma->firstblock;
4772 bma->cur->bc_private.b.flist = bma->flist;
4773 }
4774 mval->br_state = (mval->br_state == XFS_EXT_UNWRITTEN)
4775 ? XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
4776
4777 error = xfs_bmap_add_extent_unwritten_real(bma->tp, bma->ip, &bma->idx,
4778 &bma->cur, mval, bma->firstblock, bma->flist,
4779 &tmp_logflags);
4780 bma->logflags |= tmp_logflags;
4781 if (error)
4782 return error;
4783
4784 /*
4785 * Update our extent pointer, given that
4786 * xfs_bmap_add_extent_unwritten_real might have merged it into one
4787 * of the neighbouring ones.
4788 */
4789 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &bma->got);
4790
4791 /*
4792 * We may have combined previously unwritten space with written space,
4793 * so generate another request.
4794 */
4795 if (mval->br_blockcount < len)
4796 return EAGAIN;
4797 return 0;
4798 }
4799
4800 /*
4801 * Map file blocks to filesystem blocks, and allocate blocks or convert the
4802 * extent state if necessary. Details behaviour is controlled by the flags
4803 * parameter. Only allocates blocks from a single allocation group, to avoid
4804 * locking problems.
4805 *
4806 * The returned value in "firstblock" from the first call in a transaction
4807 * must be remembered and presented to subsequent calls in "firstblock".
4808 * An upper bound for the number of blocks to be allocated is supplied to
4809 * the first call in "total"; if no allocation group has that many free
4810 * blocks then the call will fail (return NULLFSBLOCK in "firstblock").
4811 */
4812 int
4813 xfs_bmapi_write(
4814 struct xfs_trans *tp, /* transaction pointer */
4815 struct xfs_inode *ip, /* incore inode */
4816 xfs_fileoff_t bno, /* starting file offs. mapped */
4817 xfs_filblks_t len, /* length to map in file */
4818 int flags, /* XFS_BMAPI_... */
4819 xfs_fsblock_t *firstblock, /* first allocated block
4820 controls a.g. for allocs */
4821 xfs_extlen_t total, /* total blocks needed */
4822 struct xfs_bmbt_irec *mval, /* output: map values */
4823 int *nmap, /* i/o: mval size/count */
4824 struct xfs_bmap_free *flist) /* i/o: list extents to free */
4825 {
4826 struct xfs_mount *mp = ip->i_mount;
4827 struct xfs_ifork *ifp;
4828 struct xfs_bmalloca bma = { 0 }; /* args for xfs_bmap_alloc */
4829 xfs_fileoff_t end; /* end of mapped file region */
4830 int eof; /* after the end of extents */
4831 int error; /* error return */
4832 int n; /* current extent index */
4833 xfs_fileoff_t obno; /* old block number (offset) */
4834 int whichfork; /* data or attr fork */
4835 char inhole; /* current location is hole in file */
4836 char wasdelay; /* old extent was delayed */
4837
4838 #ifdef DEBUG
4839 xfs_fileoff_t orig_bno; /* original block number value */
4840 int orig_flags; /* original flags arg value */
4841 xfs_filblks_t orig_len; /* original value of len arg */
4842 struct xfs_bmbt_irec *orig_mval; /* original value of mval */
4843 int orig_nmap; /* original value of *nmap */
4844
4845 orig_bno = bno;
4846 orig_len = len;
4847 orig_flags = flags;
4848 orig_mval = mval;
4849 orig_nmap = *nmap;
4850 #endif
4851
4852 ASSERT(*nmap >= 1);
4853 ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
4854 ASSERT(!(flags & XFS_BMAPI_IGSTATE));
4855 ASSERT(tp != NULL);
4856 ASSERT(len > 0);
4857
4858 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4859 XFS_ATTR_FORK : XFS_DATA_FORK;
4860
4861 if (unlikely(XFS_TEST_ERROR(
4862 (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4863 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4864 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL),
4865 mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
4866 XFS_ERROR_REPORT("xfs_bmapi_write", XFS_ERRLEVEL_LOW, mp);
4867 return XFS_ERROR(EFSCORRUPTED);
4868 }
4869
4870 if (XFS_FORCED_SHUTDOWN(mp))
4871 return XFS_ERROR(EIO);
4872
4873 ifp = XFS_IFORK_PTR(ip, whichfork);
4874 ASSERT(ifp->if_ext_max ==
4875 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
4876
4877 XFS_STATS_INC(xs_blk_mapw);
4878
4879 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4880 error = xfs_bmap_local_to_extents(tp, ip, firstblock, total,
4881 &bma.logflags, whichfork);
4882 if (error)
4883 goto error0;
4884 }
4885
4886 if (*firstblock == NULLFSBLOCK) {
4887 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
4888 bma.minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1;
4889 else
4890 bma.minleft = 1;
4891 } else {
4892 bma.minleft = 0;
4893 }
4894
4895 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
4896 error = xfs_iread_extents(tp, ip, whichfork);
4897 if (error)
4898 goto error0;
4899 }
4900
4901 xfs_bmap_search_extents(ip, bno, whichfork, &eof, &bma.idx, &bma.got,
4902 &bma.prev);
4903 n = 0;
4904 end = bno + len;
4905 obno = bno;
4906
4907 bma.tp = tp;
4908 bma.ip = ip;
4909 bma.total = total;
4910 bma.userdata = 0;
4911 bma.flist = flist;
4912 bma.firstblock = firstblock;
4913
4914 while (bno < end && n < *nmap) {
4915 inhole = eof || bma.got.br_startoff > bno;
4916 wasdelay = !inhole && isnullstartblock(bma.got.br_startblock);
4917
4918 /*
4919 * First, deal with the hole before the allocated space
4920 * that we found, if any.
4921 */
4922 if (inhole || wasdelay) {
4923 bma.eof = eof;
4924 bma.conv = !!(flags & XFS_BMAPI_CONVERT);
4925 bma.wasdel = wasdelay;
4926 bma.offset = bno;
4927
4928 /*
4929 * There's a 32/64 bit type mismatch between the
4930 * allocation length request (which can be 64 bits in
4931 * length) and the bma length request, which is
4932 * xfs_extlen_t and therefore 32 bits. Hence we have to
4933 * check for 32-bit overflows and handle them here.
4934 */
4935 if (len > (xfs_filblks_t)MAXEXTLEN)
4936 bma.length = MAXEXTLEN;
4937 else
4938 bma.length = len;
4939
4940 ASSERT(len > 0);
4941 ASSERT(bma.length > 0);
4942 error = xfs_bmapi_allocate(&bma, flags);
4943 if (error)
4944 goto error0;
4945 if (bma.blkno == NULLFSBLOCK)
4946 break;
4947 }
4948
4949 /* Deal with the allocated space we found. */
4950 xfs_bmapi_trim_map(mval, &bma.got, &bno, len, obno,
4951 end, n, flags);
4952
4953 /* Execute unwritten extent conversion if necessary */
4954 error = xfs_bmapi_convert_unwritten(&bma, mval, len, flags);
4955 if (error == EAGAIN)
4956 continue;
4957 if (error)
4958 goto error0;
4959
4960 /* update the extent map to return */
4961 xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
4962
4963 /*
4964 * If we're done, stop now. Stop when we've allocated
4965 * XFS_BMAP_MAX_NMAP extents no matter what. Otherwise
4966 * the transaction may get too big.
4967 */
4968 if (bno >= end || n >= *nmap || bma.nallocs >= *nmap)
4969 break;
4970
4971 /* Else go on to the next record. */
4972 bma.prev = bma.got;
4973 if (++bma.idx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t)) {
4974 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma.idx),
4975 &bma.got);
4976 } else
4977 eof = 1;
4978 }
4979 *nmap = n;
4980
4981 /*
4982 * Transform from btree to extents, give it cur.
4983 */
4984 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
4985 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
4986 int tmp_logflags = 0;
4987
4988 ASSERT(bma.cur);
4989 error = xfs_bmap_btree_to_extents(tp, ip, bma.cur,
4990 &tmp_logflags, whichfork);
4991 bma.logflags |= tmp_logflags;
4992 if (error)
4993 goto error0;
4994 }
4995 ASSERT(ifp->if_ext_max ==
4996 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
4997 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
4998 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max);
4999 error = 0;
5000 error0:
5001 /*
5002 * Log everything. Do this after conversion, there's no point in
5003 * logging the extent records if we've converted to btree format.
5004 */
5005 if ((bma.logflags & xfs_ilog_fext(whichfork)) &&
5006 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5007 bma.logflags &= ~xfs_ilog_fext(whichfork);
5008 else if ((bma.logflags & xfs_ilog_fbroot(whichfork)) &&
5009 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5010 bma.logflags &= ~xfs_ilog_fbroot(whichfork);
5011 /*
5012 * Log whatever the flags say, even if error. Otherwise we might miss
5013 * detecting a case where the data is changed, there's an error,
5014 * and it's not logged so we don't shutdown when we should.
5015 */
5016 if (bma.logflags)
5017 xfs_trans_log_inode(tp, ip, bma.logflags);
5018
5019 if (bma.cur) {
5020 if (!error) {
5021 ASSERT(*firstblock == NULLFSBLOCK ||
5022 XFS_FSB_TO_AGNO(mp, *firstblock) ==
5023 XFS_FSB_TO_AGNO(mp,
5024 bma.cur->bc_private.b.firstblock) ||
5025 (flist->xbf_low &&
5026 XFS_FSB_TO_AGNO(mp, *firstblock) <
5027 XFS_FSB_TO_AGNO(mp,
5028 bma.cur->bc_private.b.firstblock)));
5029 *firstblock = bma.cur->bc_private.b.firstblock;
5030 }
5031 xfs_btree_del_cursor(bma.cur,
5032 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5033 }
5034 if (!error)
5035 xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
5036 orig_nmap, *nmap);
5037 return error;
5038 }
5039
5040 /*
5041 * Unmap (remove) blocks from a file.
5042 * If nexts is nonzero then the number of extents to remove is limited to
5043 * that value. If not all extents in the block range can be removed then
5044 * *done is set.
5045 */
5046 int /* error */
5047 xfs_bunmapi(
5048 xfs_trans_t *tp, /* transaction pointer */
5049 struct xfs_inode *ip, /* incore inode */
5050 xfs_fileoff_t bno, /* starting offset to unmap */
5051 xfs_filblks_t len, /* length to unmap in file */
5052 int flags, /* misc flags */
5053 xfs_extnum_t nexts, /* number of extents max */
5054 xfs_fsblock_t *firstblock, /* first allocated block
5055 controls a.g. for allocs */
5056 xfs_bmap_free_t *flist, /* i/o: list extents to free */
5057 int *done) /* set if not done yet */
5058 {
5059 xfs_btree_cur_t *cur; /* bmap btree cursor */
5060 xfs_bmbt_irec_t del; /* extent being deleted */
5061 int eof; /* is deleting at eof */
5062 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
5063 int error; /* error return value */
5064 xfs_extnum_t extno; /* extent number in list */
5065 xfs_bmbt_irec_t got; /* current extent record */
5066 xfs_ifork_t *ifp; /* inode fork pointer */
5067 int isrt; /* freeing in rt area */
5068 xfs_extnum_t lastx; /* last extent index used */
5069 int logflags; /* transaction logging flags */
5070 xfs_extlen_t mod; /* rt extent offset */
5071 xfs_mount_t *mp; /* mount structure */
5072 xfs_extnum_t nextents; /* number of file extents */
5073 xfs_bmbt_irec_t prev; /* previous extent record */
5074 xfs_fileoff_t start; /* first file offset deleted */
5075 int tmp_logflags; /* partial logging flags */
5076 int wasdel; /* was a delayed alloc extent */
5077 int whichfork; /* data or attribute fork */
5078 xfs_fsblock_t sum;
5079
5080 trace_xfs_bunmap(ip, bno, len, flags, _RET_IP_);
5081
5082 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
5083 XFS_ATTR_FORK : XFS_DATA_FORK;
5084 ifp = XFS_IFORK_PTR(ip, whichfork);
5085 if (unlikely(
5086 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
5087 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
5088 XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW,
5089 ip->i_mount);
5090 return XFS_ERROR(EFSCORRUPTED);
5091 }
5092 mp = ip->i_mount;
5093 if (XFS_FORCED_SHUTDOWN(mp))
5094 return XFS_ERROR(EIO);
5095
5096 ASSERT(len > 0);
5097 ASSERT(nexts >= 0);
5098 ASSERT(ifp->if_ext_max ==
5099 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5100 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5101 (error = xfs_iread_extents(tp, ip, whichfork)))
5102 return error;
5103 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5104 if (nextents == 0) {
5105 *done = 1;
5106 return 0;
5107 }
5108 XFS_STATS_INC(xs_blk_unmap);
5109 isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
5110 start = bno;
5111 bno = start + len - 1;
5112 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
5113 &prev);
5114
5115 /*
5116 * Check to see if the given block number is past the end of the
5117 * file, back up to the last block if so...
5118 */
5119 if (eof) {
5120 ep = xfs_iext_get_ext(ifp, --lastx);
5121 xfs_bmbt_get_all(ep, &got);
5122 bno = got.br_startoff + got.br_blockcount - 1;
5123 }
5124 logflags = 0;
5125 if (ifp->if_flags & XFS_IFBROOT) {
5126 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
5127 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
5128 cur->bc_private.b.firstblock = *firstblock;
5129 cur->bc_private.b.flist = flist;
5130 cur->bc_private.b.flags = 0;
5131 } else
5132 cur = NULL;
5133 extno = 0;
5134 while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
5135 (nexts == 0 || extno < nexts)) {
5136 /*
5137 * Is the found extent after a hole in which bno lives?
5138 * Just back up to the previous extent, if so.
5139 */
5140 if (got.br_startoff > bno) {
5141 if (--lastx < 0)
5142 break;
5143 ep = xfs_iext_get_ext(ifp, lastx);
5144 xfs_bmbt_get_all(ep, &got);
5145 }
5146 /*
5147 * Is the last block of this extent before the range
5148 * we're supposed to delete? If so, we're done.
5149 */
5150 bno = XFS_FILEOFF_MIN(bno,
5151 got.br_startoff + got.br_blockcount - 1);
5152 if (bno < start)
5153 break;
5154 /*
5155 * Then deal with the (possibly delayed) allocated space
5156 * we found.
5157 */
5158 ASSERT(ep != NULL);
5159 del = got;
5160 wasdel = isnullstartblock(del.br_startblock);
5161 if (got.br_startoff < start) {
5162 del.br_startoff = start;
5163 del.br_blockcount -= start - got.br_startoff;
5164 if (!wasdel)
5165 del.br_startblock += start - got.br_startoff;
5166 }
5167 if (del.br_startoff + del.br_blockcount > bno + 1)
5168 del.br_blockcount = bno + 1 - del.br_startoff;
5169 sum = del.br_startblock + del.br_blockcount;
5170 if (isrt &&
5171 (mod = do_mod(sum, mp->m_sb.sb_rextsize))) {
5172 /*
5173 * Realtime extent not lined up at the end.
5174 * The extent could have been split into written
5175 * and unwritten pieces, or we could just be
5176 * unmapping part of it. But we can't really
5177 * get rid of part of a realtime extent.
5178 */
5179 if (del.br_state == XFS_EXT_UNWRITTEN ||
5180 !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5181 /*
5182 * This piece is unwritten, or we're not
5183 * using unwritten extents. Skip over it.
5184 */
5185 ASSERT(bno >= mod);
5186 bno -= mod > del.br_blockcount ?
5187 del.br_blockcount : mod;
5188 if (bno < got.br_startoff) {
5189 if (--lastx >= 0)
5190 xfs_bmbt_get_all(xfs_iext_get_ext(
5191 ifp, lastx), &got);
5192 }
5193 continue;
5194 }
5195 /*
5196 * It's written, turn it unwritten.
5197 * This is better than zeroing it.
5198 */
5199 ASSERT(del.br_state == XFS_EXT_NORM);
5200 ASSERT(xfs_trans_get_block_res(tp) > 0);
5201 /*
5202 * If this spans a realtime extent boundary,
5203 * chop it back to the start of the one we end at.
5204 */
5205 if (del.br_blockcount > mod) {
5206 del.br_startoff += del.br_blockcount - mod;
5207 del.br_startblock += del.br_blockcount - mod;
5208 del.br_blockcount = mod;
5209 }
5210 del.br_state = XFS_EXT_UNWRITTEN;
5211 error = xfs_bmap_add_extent_unwritten_real(tp, ip,
5212 &lastx, &cur, &del, firstblock, flist,
5213 &logflags);
5214 if (error)
5215 goto error0;
5216 goto nodelete;
5217 }
5218 if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) {
5219 /*
5220 * Realtime extent is lined up at the end but not
5221 * at the front. We'll get rid of full extents if
5222 * we can.
5223 */
5224 mod = mp->m_sb.sb_rextsize - mod;
5225 if (del.br_blockcount > mod) {
5226 del.br_blockcount -= mod;
5227 del.br_startoff += mod;
5228 del.br_startblock += mod;
5229 } else if ((del.br_startoff == start &&
5230 (del.br_state == XFS_EXT_UNWRITTEN ||
5231 xfs_trans_get_block_res(tp) == 0)) ||
5232 !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5233 /*
5234 * Can't make it unwritten. There isn't
5235 * a full extent here so just skip it.
5236 */
5237 ASSERT(bno >= del.br_blockcount);
5238 bno -= del.br_blockcount;
5239 if (got.br_startoff > bno) {
5240 if (--lastx >= 0) {
5241 ep = xfs_iext_get_ext(ifp,
5242 lastx);
5243 xfs_bmbt_get_all(ep, &got);
5244 }
5245 }
5246 continue;
5247 } else if (del.br_state == XFS_EXT_UNWRITTEN) {
5248 /*
5249 * This one is already unwritten.
5250 * It must have a written left neighbor.
5251 * Unwrite the killed part of that one and
5252 * try again.
5253 */
5254 ASSERT(lastx > 0);
5255 xfs_bmbt_get_all(xfs_iext_get_ext(ifp,
5256 lastx - 1), &prev);
5257 ASSERT(prev.br_state == XFS_EXT_NORM);
5258 ASSERT(!isnullstartblock(prev.br_startblock));
5259 ASSERT(del.br_startblock ==
5260 prev.br_startblock + prev.br_blockcount);
5261 if (prev.br_startoff < start) {
5262 mod = start - prev.br_startoff;
5263 prev.br_blockcount -= mod;
5264 prev.br_startblock += mod;
5265 prev.br_startoff = start;
5266 }
5267 prev.br_state = XFS_EXT_UNWRITTEN;
5268 lastx--;
5269 error = xfs_bmap_add_extent_unwritten_real(tp,
5270 ip, &lastx, &cur, &prev,
5271 firstblock, flist, &logflags);
5272 if (error)
5273 goto error0;
5274 goto nodelete;
5275 } else {
5276 ASSERT(del.br_state == XFS_EXT_NORM);
5277 del.br_state = XFS_EXT_UNWRITTEN;
5278 error = xfs_bmap_add_extent_unwritten_real(tp,
5279 ip, &lastx, &cur, &del,
5280 firstblock, flist, &logflags);
5281 if (error)
5282 goto error0;
5283 goto nodelete;
5284 }
5285 }
5286 if (wasdel) {
5287 ASSERT(startblockval(del.br_startblock) > 0);
5288 /* Update realtime/data freespace, unreserve quota */
5289 if (isrt) {
5290 xfs_filblks_t rtexts;
5291
5292 rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
5293 do_div(rtexts, mp->m_sb.sb_rextsize);
5294 xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
5295 (int64_t)rtexts, 0);
5296 (void)xfs_trans_reserve_quota_nblks(NULL,
5297 ip, -((long)del.br_blockcount), 0,
5298 XFS_QMOPT_RES_RTBLKS);
5299 } else {
5300 xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
5301 (int64_t)del.br_blockcount, 0);
5302 (void)xfs_trans_reserve_quota_nblks(NULL,
5303 ip, -((long)del.br_blockcount), 0,
5304 XFS_QMOPT_RES_REGBLKS);
5305 }
5306 ip->i_delayed_blks -= del.br_blockcount;
5307 if (cur)
5308 cur->bc_private.b.flags |=
5309 XFS_BTCUR_BPRV_WASDEL;
5310 } else if (cur)
5311 cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
5312 /*
5313 * If it's the case where the directory code is running
5314 * with no block reservation, and the deleted block is in
5315 * the middle of its extent, and the resulting insert
5316 * of an extent would cause transformation to btree format,
5317 * then reject it. The calling code will then swap
5318 * blocks around instead.
5319 * We have to do this now, rather than waiting for the
5320 * conversion to btree format, since the transaction
5321 * will be dirty.
5322 */
5323 if (!wasdel && xfs_trans_get_block_res(tp) == 0 &&
5324 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5325 XFS_IFORK_NEXTENTS(ip, whichfork) >= ifp->if_ext_max &&
5326 del.br_startoff > got.br_startoff &&
5327 del.br_startoff + del.br_blockcount <
5328 got.br_startoff + got.br_blockcount) {
5329 error = XFS_ERROR(ENOSPC);
5330 goto error0;
5331 }
5332 error = xfs_bmap_del_extent(ip, tp, &lastx, flist, cur, &del,
5333 &tmp_logflags, whichfork);
5334 logflags |= tmp_logflags;
5335 if (error)
5336 goto error0;
5337 bno = del.br_startoff - 1;
5338 nodelete:
5339 /*
5340 * If not done go on to the next (previous) record.
5341 */
5342 if (bno != (xfs_fileoff_t)-1 && bno >= start) {
5343 if (lastx >= 0) {
5344 ep = xfs_iext_get_ext(ifp, lastx);
5345 if (xfs_bmbt_get_startoff(ep) > bno) {
5346 if (--lastx >= 0)
5347 ep = xfs_iext_get_ext(ifp,
5348 lastx);
5349 }
5350 xfs_bmbt_get_all(ep, &got);
5351 }
5352 extno++;
5353 }
5354 }
5355 *done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0;
5356 ASSERT(ifp->if_ext_max ==
5357 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5358 /*
5359 * Convert to a btree if necessary.
5360 */
5361 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5362 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
5363 ASSERT(cur == NULL);
5364 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist,
5365 &cur, 0, &tmp_logflags, whichfork);
5366 logflags |= tmp_logflags;
5367 if (error)
5368 goto error0;
5369 }
5370 /*
5371 * transform from btree to extents, give it cur
5372 */
5373 else if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
5374 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
5375 ASSERT(cur != NULL);
5376 error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
5377 whichfork);
5378 logflags |= tmp_logflags;
5379 if (error)
5380 goto error0;
5381 }
5382 /*
5383 * transform from extents to local?
5384 */
5385 ASSERT(ifp->if_ext_max ==
5386 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5387 error = 0;
5388 error0:
5389 /*
5390 * Log everything. Do this after conversion, there's no point in
5391 * logging the extent records if we've converted to btree format.
5392 */
5393 if ((logflags & xfs_ilog_fext(whichfork)) &&
5394 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5395 logflags &= ~xfs_ilog_fext(whichfork);
5396 else if ((logflags & xfs_ilog_fbroot(whichfork)) &&
5397 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5398 logflags &= ~xfs_ilog_fbroot(whichfork);
5399 /*
5400 * Log inode even in the error case, if the transaction
5401 * is dirty we'll need to shut down the filesystem.
5402 */
5403 if (logflags)
5404 xfs_trans_log_inode(tp, ip, logflags);
5405 if (cur) {
5406 if (!error) {
5407 *firstblock = cur->bc_private.b.firstblock;
5408 cur->bc_private.b.allocated = 0;
5409 }
5410 xfs_btree_del_cursor(cur,
5411 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5412 }
5413 return error;
5414 }
5415
5416 /*
5417 * returns 1 for success, 0 if we failed to map the extent.
5418 */
5419 STATIC int
5420 xfs_getbmapx_fix_eof_hole(
5421 xfs_inode_t *ip, /* xfs incore inode pointer */
5422 struct getbmapx *out, /* output structure */
5423 int prealloced, /* this is a file with
5424 * preallocated data space */
5425 __int64_t end, /* last block requested */
5426 xfs_fsblock_t startblock)
5427 {
5428 __int64_t fixlen;
5429 xfs_mount_t *mp; /* file system mount point */
5430 xfs_ifork_t *ifp; /* inode fork pointer */
5431 xfs_extnum_t lastx; /* last extent pointer */
5432 xfs_fileoff_t fileblock;
5433
5434 if (startblock == HOLESTARTBLOCK) {
5435 mp = ip->i_mount;
5436 out->bmv_block = -1;
5437 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, ip->i_size));
5438 fixlen -= out->bmv_offset;
5439 if (prealloced && out->bmv_offset + out->bmv_length == end) {
5440 /* Came to hole at EOF. Trim it. */
5441 if (fixlen <= 0)
5442 return 0;
5443 out->bmv_length = fixlen;
5444 }
5445 } else {
5446 if (startblock == DELAYSTARTBLOCK)
5447 out->bmv_block = -2;
5448 else
5449 out->bmv_block = xfs_fsb_to_db(ip, startblock);
5450 fileblock = XFS_BB_TO_FSB(ip->i_mount, out->bmv_offset);
5451 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
5452 if (xfs_iext_bno_to_ext(ifp, fileblock, &lastx) &&
5453 (lastx == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))-1))
5454 out->bmv_oflags |= BMV_OF_LAST;
5455 }
5456
5457 return 1;
5458 }
5459
5460 /*
5461 * Get inode's extents as described in bmv, and format for output.
5462 * Calls formatter to fill the user's buffer until all extents
5463 * are mapped, until the passed-in bmv->bmv_count slots have
5464 * been filled, or until the formatter short-circuits the loop,
5465 * if it is tracking filled-in extents on its own.
5466 */
5467 int /* error code */
5468 xfs_getbmap(
5469 xfs_inode_t *ip,
5470 struct getbmapx *bmv, /* user bmap structure */
5471 xfs_bmap_format_t formatter, /* format to user */
5472 void *arg) /* formatter arg */
5473 {
5474 __int64_t bmvend; /* last block requested */
5475 int error = 0; /* return value */
5476 __int64_t fixlen; /* length for -1 case */
5477 int i; /* extent number */
5478 int lock; /* lock state */
5479 xfs_bmbt_irec_t *map; /* buffer for user's data */
5480 xfs_mount_t *mp; /* file system mount point */
5481 int nex; /* # of user extents can do */
5482 int nexleft; /* # of user extents left */
5483 int subnex; /* # of bmapi's can do */
5484 int nmap; /* number of map entries */
5485 struct getbmapx *out; /* output structure */
5486 int whichfork; /* data or attr fork */
5487 int prealloced; /* this is a file with
5488 * preallocated data space */
5489 int iflags; /* interface flags */
5490 int bmapi_flags; /* flags for xfs_bmapi */
5491 int cur_ext = 0;
5492
5493 mp = ip->i_mount;
5494 iflags = bmv->bmv_iflags;
5495 whichfork = iflags & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
5496
5497 if (whichfork == XFS_ATTR_FORK) {
5498 if (XFS_IFORK_Q(ip)) {
5499 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS &&
5500 ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE &&
5501 ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)
5502 return XFS_ERROR(EINVAL);
5503 } else if (unlikely(
5504 ip->i_d.di_aformat != 0 &&
5505 ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) {
5506 XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW,
5507 ip->i_mount);
5508 return XFS_ERROR(EFSCORRUPTED);
5509 }
5510
5511 prealloced = 0;
5512 fixlen = 1LL << 32;
5513 } else {
5514 if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
5515 ip->i_d.di_format != XFS_DINODE_FMT_BTREE &&
5516 ip->i_d.di_format != XFS_DINODE_FMT_LOCAL)
5517 return XFS_ERROR(EINVAL);
5518
5519 if (xfs_get_extsz_hint(ip) ||
5520 ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){
5521 prealloced = 1;
5522 fixlen = XFS_MAXIOFFSET(mp);
5523 } else {
5524 prealloced = 0;
5525 fixlen = ip->i_size;
5526 }
5527 }
5528
5529 if (bmv->bmv_length == -1) {
5530 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen));
5531 bmv->bmv_length =
5532 max_t(__int64_t, fixlen - bmv->bmv_offset, 0);
5533 } else if (bmv->bmv_length == 0) {
5534 bmv->bmv_entries = 0;
5535 return 0;
5536 } else if (bmv->bmv_length < 0) {
5537 return XFS_ERROR(EINVAL);
5538 }
5539
5540 nex = bmv->bmv_count - 1;
5541 if (nex <= 0)
5542 return XFS_ERROR(EINVAL);
5543 bmvend = bmv->bmv_offset + bmv->bmv_length;
5544
5545
5546 if (bmv->bmv_count > ULONG_MAX / sizeof(struct getbmapx))
5547 return XFS_ERROR(ENOMEM);
5548 out = kmem_zalloc(bmv->bmv_count * sizeof(struct getbmapx), KM_MAYFAIL);
5549 if (!out)
5550 return XFS_ERROR(ENOMEM);
5551
5552 xfs_ilock(ip, XFS_IOLOCK_SHARED);
5553 if (whichfork == XFS_DATA_FORK && !(iflags & BMV_IF_DELALLOC)) {
5554 if (ip->i_delayed_blks || ip->i_size > ip->i_d.di_size) {
5555 error = xfs_flush_pages(ip, 0, -1, 0, FI_REMAPF);
5556 if (error)
5557 goto out_unlock_iolock;
5558 }
5559 /*
5560 * even after flushing the inode, there can still be delalloc
5561 * blocks on the inode beyond EOF due to speculative
5562 * preallocation. These are not removed until the release
5563 * function is called or the inode is inactivated. Hence we
5564 * cannot assert here that ip->i_delayed_blks == 0.
5565 */
5566 }
5567
5568 lock = xfs_ilock_map_shared(ip);
5569
5570 /*
5571 * Don't let nex be bigger than the number of extents
5572 * we can have assuming alternating holes and real extents.
5573 */
5574 if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1)
5575 nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1;
5576
5577 bmapi_flags = xfs_bmapi_aflag(whichfork);
5578 if (!(iflags & BMV_IF_PREALLOC))
5579 bmapi_flags |= XFS_BMAPI_IGSTATE;
5580
5581 /*
5582 * Allocate enough space to handle "subnex" maps at a time.
5583 */
5584 error = ENOMEM;
5585 subnex = 16;
5586 map = kmem_alloc(subnex * sizeof(*map), KM_MAYFAIL | KM_NOFS);
5587 if (!map)
5588 goto out_unlock_ilock;
5589
5590 bmv->bmv_entries = 0;
5591
5592 if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0 &&
5593 (whichfork == XFS_ATTR_FORK || !(iflags & BMV_IF_DELALLOC))) {
5594 error = 0;
5595 goto out_free_map;
5596 }
5597
5598 nexleft = nex;
5599
5600 do {
5601 nmap = (nexleft > subnex) ? subnex : nexleft;
5602 error = xfs_bmapi_read(ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
5603 XFS_BB_TO_FSB(mp, bmv->bmv_length),
5604 map, &nmap, bmapi_flags);
5605 if (error)
5606 goto out_free_map;
5607 ASSERT(nmap <= subnex);
5608
5609 for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
5610 out[cur_ext].bmv_oflags = 0;
5611 if (map[i].br_state == XFS_EXT_UNWRITTEN)
5612 out[cur_ext].bmv_oflags |= BMV_OF_PREALLOC;
5613 else if (map[i].br_startblock == DELAYSTARTBLOCK)
5614 out[cur_ext].bmv_oflags |= BMV_OF_DELALLOC;
5615 out[cur_ext].bmv_offset =
5616 XFS_FSB_TO_BB(mp, map[i].br_startoff);
5617 out[cur_ext].bmv_length =
5618 XFS_FSB_TO_BB(mp, map[i].br_blockcount);
5619 out[cur_ext].bmv_unused1 = 0;
5620 out[cur_ext].bmv_unused2 = 0;
5621 ASSERT(((iflags & BMV_IF_DELALLOC) != 0) ||
5622 (map[i].br_startblock != DELAYSTARTBLOCK));
5623 if (map[i].br_startblock == HOLESTARTBLOCK &&
5624 whichfork == XFS_ATTR_FORK) {
5625 /* came to the end of attribute fork */
5626 out[cur_ext].bmv_oflags |= BMV_OF_LAST;
5627 goto out_free_map;
5628 }
5629
5630 if (!xfs_getbmapx_fix_eof_hole(ip, &out[cur_ext],
5631 prealloced, bmvend,
5632 map[i].br_startblock))
5633 goto out_free_map;
5634
5635 bmv->bmv_offset =
5636 out[cur_ext].bmv_offset +
5637 out[cur_ext].bmv_length;
5638 bmv->bmv_length =
5639 max_t(__int64_t, 0, bmvend - bmv->bmv_offset);
5640
5641 /*
5642 * In case we don't want to return the hole,
5643 * don't increase cur_ext so that we can reuse
5644 * it in the next loop.
5645 */
5646 if ((iflags & BMV_IF_NO_HOLES) &&
5647 map[i].br_startblock == HOLESTARTBLOCK) {
5648 memset(&out[cur_ext], 0, sizeof(out[cur_ext]));
5649 continue;
5650 }
5651
5652 nexleft--;
5653 bmv->bmv_entries++;
5654 cur_ext++;
5655 }
5656 } while (nmap && nexleft && bmv->bmv_length);
5657
5658 out_free_map:
5659 kmem_free(map);
5660 out_unlock_ilock:
5661 xfs_iunlock_map_shared(ip, lock);
5662 out_unlock_iolock:
5663 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
5664
5665 for (i = 0; i < cur_ext; i++) {
5666 int full = 0; /* user array is full */
5667
5668 /* format results & advance arg */
5669 error = formatter(&arg, &out[i], &full);
5670 if (error || full)
5671 break;
5672 }
5673
5674 kmem_free(out);
5675 return error;
5676 }
5677
5678 #ifdef DEBUG
5679 STATIC struct xfs_buf *
5680 xfs_bmap_get_bp(
5681 struct xfs_btree_cur *cur,
5682 xfs_fsblock_t bno)
5683 {
5684 struct xfs_log_item_desc *lidp;
5685 int i;
5686
5687 if (!cur)
5688 return NULL;
5689
5690 for (i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
5691 if (!cur->bc_bufs[i])
5692 break;
5693 if (XFS_BUF_ADDR(cur->bc_bufs[i]) == bno)
5694 return cur->bc_bufs[i];
5695 }
5696
5697 /* Chase down all the log items to see if the bp is there */
5698 list_for_each_entry(lidp, &cur->bc_tp->t_items, lid_trans) {
5699 struct xfs_buf_log_item *bip;
5700 bip = (struct xfs_buf_log_item *)lidp->lid_item;
5701 if (bip->bli_item.li_type == XFS_LI_BUF &&
5702 XFS_BUF_ADDR(bip->bli_buf) == bno)
5703 return bip->bli_buf;
5704 }
5705
5706 return NULL;
5707 }
5708
5709 STATIC void
5710 xfs_check_block(
5711 struct xfs_btree_block *block,
5712 xfs_mount_t *mp,
5713 int root,
5714 short sz)
5715 {
5716 int i, j, dmxr;
5717 __be64 *pp, *thispa; /* pointer to block address */
5718 xfs_bmbt_key_t *prevp, *keyp;
5719
5720 ASSERT(be16_to_cpu(block->bb_level) > 0);
5721
5722 prevp = NULL;
5723 for( i = 1; i <= xfs_btree_get_numrecs(block); i++) {
5724 dmxr = mp->m_bmap_dmxr[0];
5725 keyp = XFS_BMBT_KEY_ADDR(mp, block, i);
5726
5727 if (prevp) {
5728 ASSERT(be64_to_cpu(prevp->br_startoff) <
5729 be64_to_cpu(keyp->br_startoff));
5730 }
5731 prevp = keyp;
5732
5733 /*
5734 * Compare the block numbers to see if there are dups.
5735 */
5736 if (root)
5737 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, i, sz);
5738 else
5739 pp = XFS_BMBT_PTR_ADDR(mp, block, i, dmxr);
5740
5741 for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
5742 if (root)
5743 thispa = XFS_BMAP_BROOT_PTR_ADDR(mp, block, j, sz);
5744 else
5745 thispa = XFS_BMBT_PTR_ADDR(mp, block, j, dmxr);
5746 if (*thispa == *pp) {
5747 xfs_warn(mp, "%s: thispa(%d) == pp(%d) %Ld",
5748 __func__, j, i,
5749 (unsigned long long)be64_to_cpu(*thispa));
5750 panic("%s: ptrs are equal in node\n",
5751 __func__);
5752 }
5753 }
5754 }
5755 }
5756
5757 /*
5758 * Check that the extents for the inode ip are in the right order in all
5759 * btree leaves.
5760 */
5761
5762 STATIC void
5763 xfs_bmap_check_leaf_extents(
5764 xfs_btree_cur_t *cur, /* btree cursor or null */
5765 xfs_inode_t *ip, /* incore inode pointer */
5766 int whichfork) /* data or attr fork */
5767 {
5768 struct xfs_btree_block *block; /* current btree block */
5769 xfs_fsblock_t bno; /* block # of "block" */
5770 xfs_buf_t *bp; /* buffer for "block" */
5771 int error; /* error return value */
5772 xfs_extnum_t i=0, j; /* index into the extents list */
5773 xfs_ifork_t *ifp; /* fork structure */
5774 int level; /* btree level, for checking */
5775 xfs_mount_t *mp; /* file system mount structure */
5776 __be64 *pp; /* pointer to block address */
5777 xfs_bmbt_rec_t *ep; /* pointer to current extent */
5778 xfs_bmbt_rec_t last = {0, 0}; /* last extent in prev block */
5779 xfs_bmbt_rec_t *nextp; /* pointer to next extent */
5780 int bp_release = 0;
5781
5782 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
5783 return;
5784 }
5785
5786 bno = NULLFSBLOCK;
5787 mp = ip->i_mount;
5788 ifp = XFS_IFORK_PTR(ip, whichfork);
5789 block = ifp->if_broot;
5790 /*
5791 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
5792 */
5793 level = be16_to_cpu(block->bb_level);
5794 ASSERT(level > 0);
5795 xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
5796 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
5797 bno = be64_to_cpu(*pp);
5798
5799 ASSERT(bno != NULLDFSBNO);
5800 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
5801 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
5802
5803 /*
5804 * Go down the tree until leaf level is reached, following the first
5805 * pointer (leftmost) at each level.
5806 */
5807 while (level-- > 0) {
5808 /* See if buf is in cur first */
5809 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
5810 if (bp) {
5811 bp_release = 0;
5812 } else {
5813 bp_release = 1;
5814 }
5815 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
5816 XFS_BMAP_BTREE_REF)))
5817 goto error_norelse;
5818 block = XFS_BUF_TO_BLOCK(bp);
5819 XFS_WANT_CORRUPTED_GOTO(
5820 xfs_bmap_sanity_check(mp, bp, level),
5821 error0);
5822 if (level == 0)
5823 break;
5824
5825 /*
5826 * Check this block for basic sanity (increasing keys and
5827 * no duplicate blocks).
5828 */
5829
5830 xfs_check_block(block, mp, 0, 0);
5831 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
5832 bno = be64_to_cpu(*pp);
5833 XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
5834 if (bp_release) {
5835 bp_release = 0;
5836 xfs_trans_brelse(NULL, bp);
5837 }
5838 }
5839
5840 /*
5841 * Here with bp and block set to the leftmost leaf node in the tree.
5842 */
5843 i = 0;
5844
5845 /*
5846 * Loop over all leaf nodes checking that all extents are in the right order.
5847 */
5848 for (;;) {
5849 xfs_fsblock_t nextbno;
5850 xfs_extnum_t num_recs;
5851
5852
5853 num_recs = xfs_btree_get_numrecs(block);
5854
5855 /*
5856 * Read-ahead the next leaf block, if any.
5857 */
5858
5859 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
5860
5861 /*
5862 * Check all the extents to make sure they are OK.
5863 * If we had a previous block, the last entry should
5864 * conform with the first entry in this one.
5865 */
5866
5867 ep = XFS_BMBT_REC_ADDR(mp, block, 1);
5868 if (i) {
5869 ASSERT(xfs_bmbt_disk_get_startoff(&last) +
5870 xfs_bmbt_disk_get_blockcount(&last) <=
5871 xfs_bmbt_disk_get_startoff(ep));
5872 }
5873 for (j = 1; j < num_recs; j++) {
5874 nextp = XFS_BMBT_REC_ADDR(mp, block, j + 1);
5875 ASSERT(xfs_bmbt_disk_get_startoff(ep) +
5876 xfs_bmbt_disk_get_blockcount(ep) <=
5877 xfs_bmbt_disk_get_startoff(nextp));
5878 ep = nextp;
5879 }
5880
5881 last = *ep;
5882 i += num_recs;
5883 if (bp_release) {
5884 bp_release = 0;
5885 xfs_trans_brelse(NULL, bp);
5886 }
5887 bno = nextbno;
5888 /*
5889 * If we've reached the end, stop.
5890 */
5891 if (bno == NULLFSBLOCK)
5892 break;
5893
5894 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
5895 if (bp) {
5896 bp_release = 0;
5897 } else {
5898 bp_release = 1;
5899 }
5900 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
5901 XFS_BMAP_BTREE_REF)))
5902 goto error_norelse;
5903 block = XFS_BUF_TO_BLOCK(bp);
5904 }
5905 if (bp_release) {
5906 bp_release = 0;
5907 xfs_trans_brelse(NULL, bp);
5908 }
5909 return;
5910
5911 error0:
5912 xfs_warn(mp, "%s: at error0", __func__);
5913 if (bp_release)
5914 xfs_trans_brelse(NULL, bp);
5915 error_norelse:
5916 xfs_warn(mp, "%s: BAD after btree leaves for %d extents",
5917 __func__, i);
5918 panic("%s: CORRUPTED BTREE OR SOMETHING", __func__);
5919 return;
5920 }
5921 #endif
5922
5923 /*
5924 * Count fsblocks of the given fork.
5925 */
5926 int /* error */
5927 xfs_bmap_count_blocks(
5928 xfs_trans_t *tp, /* transaction pointer */
5929 xfs_inode_t *ip, /* incore inode */
5930 int whichfork, /* data or attr fork */
5931 int *count) /* out: count of blocks */
5932 {
5933 struct xfs_btree_block *block; /* current btree block */
5934 xfs_fsblock_t bno; /* block # of "block" */
5935 xfs_ifork_t *ifp; /* fork structure */
5936 int level; /* btree level, for checking */
5937 xfs_mount_t *mp; /* file system mount structure */
5938 __be64 *pp; /* pointer to block address */
5939
5940 bno = NULLFSBLOCK;
5941 mp = ip->i_mount;
5942 ifp = XFS_IFORK_PTR(ip, whichfork);
5943 if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) {
5944 xfs_bmap_count_leaves(ifp, 0,
5945 ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t),
5946 count);
5947 return 0;
5948 }
5949
5950 /*
5951 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
5952 */
5953 block = ifp->if_broot;
5954 level = be16_to_cpu(block->bb_level);
5955 ASSERT(level > 0);
5956 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
5957 bno = be64_to_cpu(*pp);
5958 ASSERT(bno != NULLDFSBNO);
5959 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
5960 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
5961
5962 if (unlikely(xfs_bmap_count_tree(mp, tp, ifp, bno, level, count) < 0)) {
5963 XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW,
5964 mp);
5965 return XFS_ERROR(EFSCORRUPTED);
5966 }
5967
5968 return 0;
5969 }
5970
5971 /*
5972 * Recursively walks each level of a btree
5973 * to count total fsblocks is use.
5974 */
5975 STATIC int /* error */
5976 xfs_bmap_count_tree(
5977 xfs_mount_t *mp, /* file system mount point */
5978 xfs_trans_t *tp, /* transaction pointer */
5979 xfs_ifork_t *ifp, /* inode fork pointer */
5980 xfs_fsblock_t blockno, /* file system block number */
5981 int levelin, /* level in btree */
5982 int *count) /* Count of blocks */
5983 {
5984 int error;
5985 xfs_buf_t *bp, *nbp;
5986 int level = levelin;
5987 __be64 *pp;
5988 xfs_fsblock_t bno = blockno;
5989 xfs_fsblock_t nextbno;
5990 struct xfs_btree_block *block, *nextblock;
5991 int numrecs;
5992
5993 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF)))
5994 return error;
5995 *count += 1;
5996 block = XFS_BUF_TO_BLOCK(bp);
5997
5998 if (--level) {
5999 /* Not at node above leaves, count this level of nodes */
6000 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
6001 while (nextbno != NULLFSBLOCK) {
6002 if ((error = xfs_btree_read_bufl(mp, tp, nextbno,
6003 0, &nbp, XFS_BMAP_BTREE_REF)))
6004 return error;
6005 *count += 1;
6006 nextblock = XFS_BUF_TO_BLOCK(nbp);
6007 nextbno = be64_to_cpu(nextblock->bb_u.l.bb_rightsib);
6008 xfs_trans_brelse(tp, nbp);
6009 }
6010
6011 /* Dive to the next level */
6012 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
6013 bno = be64_to_cpu(*pp);
6014 if (unlikely((error =
6015 xfs_bmap_count_tree(mp, tp, ifp, bno, level, count)) < 0)) {
6016 xfs_trans_brelse(tp, bp);
6017 XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
6018 XFS_ERRLEVEL_LOW, mp);
6019 return XFS_ERROR(EFSCORRUPTED);
6020 }
6021 xfs_trans_brelse(tp, bp);
6022 } else {
6023 /* count all level 1 nodes and their leaves */
6024 for (;;) {
6025 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
6026 numrecs = be16_to_cpu(block->bb_numrecs);
6027 xfs_bmap_disk_count_leaves(mp, block, numrecs, count);
6028 xfs_trans_brelse(tp, bp);
6029 if (nextbno == NULLFSBLOCK)
6030 break;
6031 bno = nextbno;
6032 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
6033 XFS_BMAP_BTREE_REF)))
6034 return error;
6035 *count += 1;
6036 block = XFS_BUF_TO_BLOCK(bp);
6037 }
6038 }
6039 return 0;
6040 }
6041
6042 /*
6043 * Count leaf blocks given a range of extent records.
6044 */
6045 STATIC void
6046 xfs_bmap_count_leaves(
6047 xfs_ifork_t *ifp,
6048 xfs_extnum_t idx,
6049 int numrecs,
6050 int *count)
6051 {
6052 int b;
6053
6054 for (b = 0; b < numrecs; b++) {
6055 xfs_bmbt_rec_host_t *frp = xfs_iext_get_ext(ifp, idx + b);
6056 *count += xfs_bmbt_get_blockcount(frp);
6057 }
6058 }
6059
6060 /*
6061 * Count leaf blocks given a range of extent records originally
6062 * in btree format.
6063 */
6064 STATIC void
6065 xfs_bmap_disk_count_leaves(
6066 struct xfs_mount *mp,
6067 struct xfs_btree_block *block,
6068 int numrecs,
6069 int *count)
6070 {
6071 int b;
6072 xfs_bmbt_rec_t *frp;
6073
6074 for (b = 1; b <= numrecs; b++) {
6075 frp = XFS_BMBT_REC_ADDR(mp, block, b);
6076 *count += xfs_bmbt_disk_get_blockcount(frp);
6077 }
6078 }
6079
6080 /*
6081 * dead simple method of punching delalyed allocation blocks from a range in
6082 * the inode. Walks a block at a time so will be slow, but is only executed in
6083 * rare error cases so the overhead is not critical. This will alays punch out
6084 * both the start and end blocks, even if the ranges only partially overlap
6085 * them, so it is up to the caller to ensure that partial blocks are not
6086 * passed in.
6087 */
6088 int
6089 xfs_bmap_punch_delalloc_range(
6090 struct xfs_inode *ip,
6091 xfs_fileoff_t start_fsb,
6092 xfs_fileoff_t length)
6093 {
6094 xfs_fileoff_t remaining = length;
6095 int error = 0;
6096
6097 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
6098
6099 do {
6100 int done;
6101 xfs_bmbt_irec_t imap;
6102 int nimaps = 1;
6103 xfs_fsblock_t firstblock;
6104 xfs_bmap_free_t flist;
6105
6106 /*
6107 * Map the range first and check that it is a delalloc extent
6108 * before trying to unmap the range. Otherwise we will be
6109 * trying to remove a real extent (which requires a
6110 * transaction) or a hole, which is probably a bad idea...
6111 */
6112 error = xfs_bmapi_read(ip, start_fsb, 1, &imap, &nimaps,
6113 XFS_BMAPI_ENTIRE);
6114
6115 if (error) {
6116 /* something screwed, just bail */
6117 if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
6118 xfs_alert(ip->i_mount,
6119 "Failed delalloc mapping lookup ino %lld fsb %lld.",
6120 ip->i_ino, start_fsb);
6121 }
6122 break;
6123 }
6124 if (!nimaps) {
6125 /* nothing there */
6126 goto next_block;
6127 }
6128 if (imap.br_startblock != DELAYSTARTBLOCK) {
6129 /* been converted, ignore */
6130 goto next_block;
6131 }
6132 WARN_ON(imap.br_blockcount == 0);
6133
6134 /*
6135 * Note: while we initialise the firstblock/flist pair, they
6136 * should never be used because blocks should never be
6137 * allocated or freed for a delalloc extent and hence we need
6138 * don't cancel or finish them after the xfs_bunmapi() call.
6139 */
6140 xfs_bmap_init(&flist, &firstblock);
6141 error = xfs_bunmapi(NULL, ip, start_fsb, 1, 0, 1, &firstblock,
6142 &flist, &done);
6143 if (error)
6144 break;
6145
6146 ASSERT(!flist.xbf_count && !flist.xbf_first);
6147 next_block:
6148 start_fsb++;
6149 remaining--;
6150 } while(remaining > 0);
6151
6152 return error;
6153 }