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[XFS] Add new getbmap flags.
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / xfs / xfs_bmap.c
1 /*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_inum.h"
24 #include "xfs_trans.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_dir2.h"
28 #include "xfs_da_btree.h"
29 #include "xfs_bmap_btree.h"
30 #include "xfs_alloc_btree.h"
31 #include "xfs_ialloc_btree.h"
32 #include "xfs_dir2_sf.h"
33 #include "xfs_attr_sf.h"
34 #include "xfs_dinode.h"
35 #include "xfs_inode.h"
36 #include "xfs_btree.h"
37 #include "xfs_dmapi.h"
38 #include "xfs_mount.h"
39 #include "xfs_ialloc.h"
40 #include "xfs_itable.h"
41 #include "xfs_dir2_data.h"
42 #include "xfs_dir2_leaf.h"
43 #include "xfs_dir2_block.h"
44 #include "xfs_inode_item.h"
45 #include "xfs_extfree_item.h"
46 #include "xfs_alloc.h"
47 #include "xfs_bmap.h"
48 #include "xfs_rtalloc.h"
49 #include "xfs_error.h"
50 #include "xfs_attr_leaf.h"
51 #include "xfs_rw.h"
52 #include "xfs_quota.h"
53 #include "xfs_trans_space.h"
54 #include "xfs_buf_item.h"
55 #include "xfs_filestream.h"
56 #include "xfs_vnodeops.h"
57
58
59 #ifdef DEBUG
60 STATIC void
61 xfs_bmap_check_leaf_extents(xfs_btree_cur_t *cur, xfs_inode_t *ip, int whichfork);
62 #endif
63
64 kmem_zone_t *xfs_bmap_free_item_zone;
65
66 /*
67 * Prototypes for internal bmap routines.
68 */
69
70
71 /*
72 * Called from xfs_bmap_add_attrfork to handle extents format files.
73 */
74 STATIC int /* error */
75 xfs_bmap_add_attrfork_extents(
76 xfs_trans_t *tp, /* transaction pointer */
77 xfs_inode_t *ip, /* incore inode pointer */
78 xfs_fsblock_t *firstblock, /* first block allocated */
79 xfs_bmap_free_t *flist, /* blocks to free at commit */
80 int *flags); /* inode logging flags */
81
82 /*
83 * Called from xfs_bmap_add_attrfork to handle local format files.
84 */
85 STATIC int /* error */
86 xfs_bmap_add_attrfork_local(
87 xfs_trans_t *tp, /* transaction pointer */
88 xfs_inode_t *ip, /* incore inode pointer */
89 xfs_fsblock_t *firstblock, /* first block allocated */
90 xfs_bmap_free_t *flist, /* blocks to free at commit */
91 int *flags); /* inode logging flags */
92
93 /*
94 * Called by xfs_bmapi to update file extent records and the btree
95 * after allocating space (or doing a delayed allocation).
96 */
97 STATIC int /* error */
98 xfs_bmap_add_extent(
99 xfs_inode_t *ip, /* incore inode pointer */
100 xfs_extnum_t idx, /* extent number to update/insert */
101 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
102 xfs_bmbt_irec_t *new, /* new data to add to file extents */
103 xfs_fsblock_t *first, /* pointer to firstblock variable */
104 xfs_bmap_free_t *flist, /* list of extents to be freed */
105 int *logflagsp, /* inode logging flags */
106 xfs_extdelta_t *delta, /* Change made to incore extents */
107 int whichfork, /* data or attr fork */
108 int rsvd); /* OK to allocate reserved blocks */
109
110 /*
111 * Called by xfs_bmap_add_extent to handle cases converting a delayed
112 * allocation to a real allocation.
113 */
114 STATIC int /* error */
115 xfs_bmap_add_extent_delay_real(
116 xfs_inode_t *ip, /* incore inode pointer */
117 xfs_extnum_t idx, /* extent number to update/insert */
118 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
119 xfs_bmbt_irec_t *new, /* new data to add to file extents */
120 xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
121 xfs_fsblock_t *first, /* pointer to firstblock variable */
122 xfs_bmap_free_t *flist, /* list of extents to be freed */
123 int *logflagsp, /* inode logging flags */
124 xfs_extdelta_t *delta, /* Change made to incore extents */
125 int rsvd); /* OK to allocate reserved blocks */
126
127 /*
128 * Called by xfs_bmap_add_extent to handle cases converting a hole
129 * to a delayed allocation.
130 */
131 STATIC int /* error */
132 xfs_bmap_add_extent_hole_delay(
133 xfs_inode_t *ip, /* incore inode pointer */
134 xfs_extnum_t idx, /* extent number to update/insert */
135 xfs_bmbt_irec_t *new, /* new data to add to file extents */
136 int *logflagsp,/* inode logging flags */
137 xfs_extdelta_t *delta, /* Change made to incore extents */
138 int rsvd); /* OK to allocate reserved blocks */
139
140 /*
141 * Called by xfs_bmap_add_extent to handle cases converting a hole
142 * to a real allocation.
143 */
144 STATIC int /* error */
145 xfs_bmap_add_extent_hole_real(
146 xfs_inode_t *ip, /* incore inode pointer */
147 xfs_extnum_t idx, /* extent number to update/insert */
148 xfs_btree_cur_t *cur, /* if null, not a btree */
149 xfs_bmbt_irec_t *new, /* new data to add to file extents */
150 int *logflagsp, /* inode logging flags */
151 xfs_extdelta_t *delta, /* Change made to incore extents */
152 int whichfork); /* data or attr fork */
153
154 /*
155 * Called by xfs_bmap_add_extent to handle cases converting an unwritten
156 * allocation to a real allocation or vice versa.
157 */
158 STATIC int /* error */
159 xfs_bmap_add_extent_unwritten_real(
160 xfs_inode_t *ip, /* incore inode pointer */
161 xfs_extnum_t idx, /* extent number to update/insert */
162 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
163 xfs_bmbt_irec_t *new, /* new data to add to file extents */
164 int *logflagsp, /* inode logging flags */
165 xfs_extdelta_t *delta); /* Change made to incore extents */
166
167 /*
168 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
169 * It figures out where to ask the underlying allocator to put the new extent.
170 */
171 STATIC int /* error */
172 xfs_bmap_alloc(
173 xfs_bmalloca_t *ap); /* bmap alloc argument struct */
174
175 /*
176 * Transform a btree format file with only one leaf node, where the
177 * extents list will fit in the inode, into an extents format file.
178 * Since the file extents are already in-core, all we have to do is
179 * give up the space for the btree root and pitch the leaf block.
180 */
181 STATIC int /* error */
182 xfs_bmap_btree_to_extents(
183 xfs_trans_t *tp, /* transaction pointer */
184 xfs_inode_t *ip, /* incore inode pointer */
185 xfs_btree_cur_t *cur, /* btree cursor */
186 int *logflagsp, /* inode logging flags */
187 int whichfork); /* data or attr fork */
188
189 /*
190 * Called by xfs_bmapi to update file extent records and the btree
191 * after removing space (or undoing a delayed allocation).
192 */
193 STATIC int /* error */
194 xfs_bmap_del_extent(
195 xfs_inode_t *ip, /* incore inode pointer */
196 xfs_trans_t *tp, /* current trans pointer */
197 xfs_extnum_t idx, /* extent number to update/insert */
198 xfs_bmap_free_t *flist, /* list of extents to be freed */
199 xfs_btree_cur_t *cur, /* if null, not a btree */
200 xfs_bmbt_irec_t *new, /* new data to add to file extents */
201 int *logflagsp,/* inode logging flags */
202 xfs_extdelta_t *delta, /* Change made to incore extents */
203 int whichfork, /* data or attr fork */
204 int rsvd); /* OK to allocate reserved blocks */
205
206 /*
207 * Remove the entry "free" from the free item list. Prev points to the
208 * previous entry, unless "free" is the head of the list.
209 */
210 STATIC void
211 xfs_bmap_del_free(
212 xfs_bmap_free_t *flist, /* free item list header */
213 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
214 xfs_bmap_free_item_t *free); /* list item to be freed */
215
216 /*
217 * Convert an extents-format file into a btree-format file.
218 * The new file will have a root block (in the inode) and a single child block.
219 */
220 STATIC int /* error */
221 xfs_bmap_extents_to_btree(
222 xfs_trans_t *tp, /* transaction pointer */
223 xfs_inode_t *ip, /* incore inode pointer */
224 xfs_fsblock_t *firstblock, /* first-block-allocated */
225 xfs_bmap_free_t *flist, /* blocks freed in xaction */
226 xfs_btree_cur_t **curp, /* cursor returned to caller */
227 int wasdel, /* converting a delayed alloc */
228 int *logflagsp, /* inode logging flags */
229 int whichfork); /* data or attr fork */
230
231 /*
232 * Convert a local file to an extents file.
233 * This code is sort of bogus, since the file data needs to get
234 * logged so it won't be lost. The bmap-level manipulations are ok, though.
235 */
236 STATIC int /* error */
237 xfs_bmap_local_to_extents(
238 xfs_trans_t *tp, /* transaction pointer */
239 xfs_inode_t *ip, /* incore inode pointer */
240 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
241 xfs_extlen_t total, /* total blocks needed by transaction */
242 int *logflagsp, /* inode logging flags */
243 int whichfork); /* data or attr fork */
244
245 /*
246 * Search the extents list for the inode, for the extent containing bno.
247 * If bno lies in a hole, point to the next entry. If bno lies past eof,
248 * *eofp will be set, and *prevp will contain the last entry (null if none).
249 * Else, *lastxp will be set to the index of the found
250 * entry; *gotp will contain the entry.
251 */
252 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
253 xfs_bmap_search_extents(
254 xfs_inode_t *ip, /* incore inode pointer */
255 xfs_fileoff_t bno, /* block number searched for */
256 int whichfork, /* data or attr fork */
257 int *eofp, /* out: end of file found */
258 xfs_extnum_t *lastxp, /* out: last extent index */
259 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
260 xfs_bmbt_irec_t *prevp); /* out: previous extent entry found */
261
262 /*
263 * Check the last inode extent to determine whether this allocation will result
264 * in blocks being allocated at the end of the file. When we allocate new data
265 * blocks at the end of the file which do not start at the previous data block,
266 * we will try to align the new blocks at stripe unit boundaries.
267 */
268 STATIC int /* error */
269 xfs_bmap_isaeof(
270 xfs_inode_t *ip, /* incore inode pointer */
271 xfs_fileoff_t off, /* file offset in fsblocks */
272 int whichfork, /* data or attribute fork */
273 char *aeof); /* return value */
274
275 #ifdef XFS_BMAP_TRACE
276 /*
277 * Add bmap trace entry prior to a call to xfs_iext_remove.
278 */
279 STATIC void
280 xfs_bmap_trace_delete(
281 const char *fname, /* function name */
282 char *desc, /* operation description */
283 xfs_inode_t *ip, /* incore inode pointer */
284 xfs_extnum_t idx, /* index of entry(entries) deleted */
285 xfs_extnum_t cnt, /* count of entries deleted, 1 or 2 */
286 int whichfork); /* data or attr fork */
287
288 /*
289 * Add bmap trace entry prior to a call to xfs_iext_insert, or
290 * reading in the extents list from the disk (in the btree).
291 */
292 STATIC void
293 xfs_bmap_trace_insert(
294 const char *fname, /* function name */
295 char *desc, /* operation description */
296 xfs_inode_t *ip, /* incore inode pointer */
297 xfs_extnum_t idx, /* index of entry(entries) inserted */
298 xfs_extnum_t cnt, /* count of entries inserted, 1 or 2 */
299 xfs_bmbt_irec_t *r1, /* inserted record 1 */
300 xfs_bmbt_irec_t *r2, /* inserted record 2 or null */
301 int whichfork); /* data or attr fork */
302
303 /*
304 * Add bmap trace entry after updating an extent record in place.
305 */
306 STATIC void
307 xfs_bmap_trace_post_update(
308 const char *fname, /* function name */
309 char *desc, /* operation description */
310 xfs_inode_t *ip, /* incore inode pointer */
311 xfs_extnum_t idx, /* index of entry updated */
312 int whichfork); /* data or attr fork */
313
314 /*
315 * Add bmap trace entry prior to updating an extent record in place.
316 */
317 STATIC void
318 xfs_bmap_trace_pre_update(
319 const char *fname, /* function name */
320 char *desc, /* operation description */
321 xfs_inode_t *ip, /* incore inode pointer */
322 xfs_extnum_t idx, /* index of entry to be updated */
323 int whichfork); /* data or attr fork */
324
325 #define XFS_BMAP_TRACE_DELETE(d,ip,i,c,w) \
326 xfs_bmap_trace_delete(__func__,d,ip,i,c,w)
327 #define XFS_BMAP_TRACE_INSERT(d,ip,i,c,r1,r2,w) \
328 xfs_bmap_trace_insert(__func__,d,ip,i,c,r1,r2,w)
329 #define XFS_BMAP_TRACE_POST_UPDATE(d,ip,i,w) \
330 xfs_bmap_trace_post_update(__func__,d,ip,i,w)
331 #define XFS_BMAP_TRACE_PRE_UPDATE(d,ip,i,w) \
332 xfs_bmap_trace_pre_update(__func__,d,ip,i,w)
333 #else
334 #define XFS_BMAP_TRACE_DELETE(d,ip,i,c,w)
335 #define XFS_BMAP_TRACE_INSERT(d,ip,i,c,r1,r2,w)
336 #define XFS_BMAP_TRACE_POST_UPDATE(d,ip,i,w)
337 #define XFS_BMAP_TRACE_PRE_UPDATE(d,ip,i,w)
338 #endif /* XFS_BMAP_TRACE */
339
340 /*
341 * Compute the worst-case number of indirect blocks that will be used
342 * for ip's delayed extent of length "len".
343 */
344 STATIC xfs_filblks_t
345 xfs_bmap_worst_indlen(
346 xfs_inode_t *ip, /* incore inode pointer */
347 xfs_filblks_t len); /* delayed extent length */
348
349 #ifdef DEBUG
350 /*
351 * Perform various validation checks on the values being returned
352 * from xfs_bmapi().
353 */
354 STATIC void
355 xfs_bmap_validate_ret(
356 xfs_fileoff_t bno,
357 xfs_filblks_t len,
358 int flags,
359 xfs_bmbt_irec_t *mval,
360 int nmap,
361 int ret_nmap);
362 #else
363 #define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
364 #endif /* DEBUG */
365
366 #if defined(XFS_RW_TRACE)
367 STATIC void
368 xfs_bunmap_trace(
369 xfs_inode_t *ip,
370 xfs_fileoff_t bno,
371 xfs_filblks_t len,
372 int flags,
373 inst_t *ra);
374 #else
375 #define xfs_bunmap_trace(ip, bno, len, flags, ra)
376 #endif /* XFS_RW_TRACE */
377
378 STATIC int
379 xfs_bmap_count_tree(
380 xfs_mount_t *mp,
381 xfs_trans_t *tp,
382 xfs_ifork_t *ifp,
383 xfs_fsblock_t blockno,
384 int levelin,
385 int *count);
386
387 STATIC void
388 xfs_bmap_count_leaves(
389 xfs_ifork_t *ifp,
390 xfs_extnum_t idx,
391 int numrecs,
392 int *count);
393
394 STATIC void
395 xfs_bmap_disk_count_leaves(
396 struct xfs_mount *mp,
397 struct xfs_btree_block *block,
398 int numrecs,
399 int *count);
400
401 /*
402 * Bmap internal routines.
403 */
404
405 STATIC int /* error */
406 xfs_bmbt_lookup_eq(
407 struct xfs_btree_cur *cur,
408 xfs_fileoff_t off,
409 xfs_fsblock_t bno,
410 xfs_filblks_t len,
411 int *stat) /* success/failure */
412 {
413 cur->bc_rec.b.br_startoff = off;
414 cur->bc_rec.b.br_startblock = bno;
415 cur->bc_rec.b.br_blockcount = len;
416 return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
417 }
418
419 STATIC int /* error */
420 xfs_bmbt_lookup_ge(
421 struct xfs_btree_cur *cur,
422 xfs_fileoff_t off,
423 xfs_fsblock_t bno,
424 xfs_filblks_t len,
425 int *stat) /* success/failure */
426 {
427 cur->bc_rec.b.br_startoff = off;
428 cur->bc_rec.b.br_startblock = bno;
429 cur->bc_rec.b.br_blockcount = len;
430 return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
431 }
432
433 /*
434 * Update the record referred to by cur to the value given
435 * by [off, bno, len, state].
436 * This either works (return 0) or gets an EFSCORRUPTED error.
437 */
438 STATIC int
439 xfs_bmbt_update(
440 struct xfs_btree_cur *cur,
441 xfs_fileoff_t off,
442 xfs_fsblock_t bno,
443 xfs_filblks_t len,
444 xfs_exntst_t state)
445 {
446 union xfs_btree_rec rec;
447
448 xfs_bmbt_disk_set_allf(&rec.bmbt, off, bno, len, state);
449 return xfs_btree_update(cur, &rec);
450 }
451
452 /*
453 * Called from xfs_bmap_add_attrfork to handle btree format files.
454 */
455 STATIC int /* error */
456 xfs_bmap_add_attrfork_btree(
457 xfs_trans_t *tp, /* transaction pointer */
458 xfs_inode_t *ip, /* incore inode pointer */
459 xfs_fsblock_t *firstblock, /* first block allocated */
460 xfs_bmap_free_t *flist, /* blocks to free at commit */
461 int *flags) /* inode logging flags */
462 {
463 xfs_btree_cur_t *cur; /* btree cursor */
464 int error; /* error return value */
465 xfs_mount_t *mp; /* file system mount struct */
466 int stat; /* newroot status */
467
468 mp = ip->i_mount;
469 if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
470 *flags |= XFS_ILOG_DBROOT;
471 else {
472 cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
473 cur->bc_private.b.flist = flist;
474 cur->bc_private.b.firstblock = *firstblock;
475 if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
476 goto error0;
477 /* must be at least one entry */
478 XFS_WANT_CORRUPTED_GOTO(stat == 1, error0);
479 if ((error = xfs_btree_new_iroot(cur, flags, &stat)))
480 goto error0;
481 if (stat == 0) {
482 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
483 return XFS_ERROR(ENOSPC);
484 }
485 *firstblock = cur->bc_private.b.firstblock;
486 cur->bc_private.b.allocated = 0;
487 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
488 }
489 return 0;
490 error0:
491 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
492 return error;
493 }
494
495 /*
496 * Called from xfs_bmap_add_attrfork to handle extents format files.
497 */
498 STATIC int /* error */
499 xfs_bmap_add_attrfork_extents(
500 xfs_trans_t *tp, /* transaction pointer */
501 xfs_inode_t *ip, /* incore inode pointer */
502 xfs_fsblock_t *firstblock, /* first block allocated */
503 xfs_bmap_free_t *flist, /* blocks to free at commit */
504 int *flags) /* inode logging flags */
505 {
506 xfs_btree_cur_t *cur; /* bmap btree cursor */
507 int error; /* error return value */
508
509 if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
510 return 0;
511 cur = NULL;
512 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist, &cur, 0,
513 flags, XFS_DATA_FORK);
514 if (cur) {
515 cur->bc_private.b.allocated = 0;
516 xfs_btree_del_cursor(cur,
517 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
518 }
519 return error;
520 }
521
522 /*
523 * Called from xfs_bmap_add_attrfork to handle local format files.
524 */
525 STATIC int /* error */
526 xfs_bmap_add_attrfork_local(
527 xfs_trans_t *tp, /* transaction pointer */
528 xfs_inode_t *ip, /* incore inode pointer */
529 xfs_fsblock_t *firstblock, /* first block allocated */
530 xfs_bmap_free_t *flist, /* blocks to free at commit */
531 int *flags) /* inode logging flags */
532 {
533 xfs_da_args_t dargs; /* args for dir/attr code */
534 int error; /* error return value */
535 xfs_mount_t *mp; /* mount structure pointer */
536
537 if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
538 return 0;
539 if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
540 mp = ip->i_mount;
541 memset(&dargs, 0, sizeof(dargs));
542 dargs.dp = ip;
543 dargs.firstblock = firstblock;
544 dargs.flist = flist;
545 dargs.total = mp->m_dirblkfsbs;
546 dargs.whichfork = XFS_DATA_FORK;
547 dargs.trans = tp;
548 error = xfs_dir2_sf_to_block(&dargs);
549 } else
550 error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
551 XFS_DATA_FORK);
552 return error;
553 }
554
555 /*
556 * Called by xfs_bmapi to update file extent records and the btree
557 * after allocating space (or doing a delayed allocation).
558 */
559 STATIC int /* error */
560 xfs_bmap_add_extent(
561 xfs_inode_t *ip, /* incore inode pointer */
562 xfs_extnum_t idx, /* extent number to update/insert */
563 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
564 xfs_bmbt_irec_t *new, /* new data to add to file extents */
565 xfs_fsblock_t *first, /* pointer to firstblock variable */
566 xfs_bmap_free_t *flist, /* list of extents to be freed */
567 int *logflagsp, /* inode logging flags */
568 xfs_extdelta_t *delta, /* Change made to incore extents */
569 int whichfork, /* data or attr fork */
570 int rsvd) /* OK to use reserved data blocks */
571 {
572 xfs_btree_cur_t *cur; /* btree cursor or null */
573 xfs_filblks_t da_new; /* new count del alloc blocks used */
574 xfs_filblks_t da_old; /* old count del alloc blocks used */
575 int error; /* error return value */
576 xfs_ifork_t *ifp; /* inode fork ptr */
577 int logflags; /* returned value */
578 xfs_extnum_t nextents; /* number of extents in file now */
579
580 XFS_STATS_INC(xs_add_exlist);
581 cur = *curp;
582 ifp = XFS_IFORK_PTR(ip, whichfork);
583 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
584 ASSERT(idx <= nextents);
585 da_old = da_new = 0;
586 error = 0;
587 /*
588 * This is the first extent added to a new/empty file.
589 * Special case this one, so other routines get to assume there are
590 * already extents in the list.
591 */
592 if (nextents == 0) {
593 XFS_BMAP_TRACE_INSERT("insert empty", ip, 0, 1, new, NULL,
594 whichfork);
595 xfs_iext_insert(ifp, 0, 1, new);
596 ASSERT(cur == NULL);
597 ifp->if_lastex = 0;
598 if (!ISNULLSTARTBLOCK(new->br_startblock)) {
599 XFS_IFORK_NEXT_SET(ip, whichfork, 1);
600 logflags = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
601 } else
602 logflags = 0;
603 /* DELTA: single new extent */
604 if (delta) {
605 if (delta->xed_startoff > new->br_startoff)
606 delta->xed_startoff = new->br_startoff;
607 if (delta->xed_blockcount <
608 new->br_startoff + new->br_blockcount)
609 delta->xed_blockcount = new->br_startoff +
610 new->br_blockcount;
611 }
612 }
613 /*
614 * Any kind of new delayed allocation goes here.
615 */
616 else if (ISNULLSTARTBLOCK(new->br_startblock)) {
617 if (cur)
618 ASSERT((cur->bc_private.b.flags &
619 XFS_BTCUR_BPRV_WASDEL) == 0);
620 if ((error = xfs_bmap_add_extent_hole_delay(ip, idx, new,
621 &logflags, delta, rsvd)))
622 goto done;
623 }
624 /*
625 * Real allocation off the end of the file.
626 */
627 else if (idx == nextents) {
628 if (cur)
629 ASSERT((cur->bc_private.b.flags &
630 XFS_BTCUR_BPRV_WASDEL) == 0);
631 if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur, new,
632 &logflags, delta, whichfork)))
633 goto done;
634 } else {
635 xfs_bmbt_irec_t prev; /* old extent at offset idx */
636
637 /*
638 * Get the record referred to by idx.
639 */
640 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx), &prev);
641 /*
642 * If it's a real allocation record, and the new allocation ends
643 * after the start of the referred to record, then we're filling
644 * in a delayed or unwritten allocation with a real one, or
645 * converting real back to unwritten.
646 */
647 if (!ISNULLSTARTBLOCK(new->br_startblock) &&
648 new->br_startoff + new->br_blockcount > prev.br_startoff) {
649 if (prev.br_state != XFS_EXT_UNWRITTEN &&
650 ISNULLSTARTBLOCK(prev.br_startblock)) {
651 da_old = STARTBLOCKVAL(prev.br_startblock);
652 if (cur)
653 ASSERT(cur->bc_private.b.flags &
654 XFS_BTCUR_BPRV_WASDEL);
655 if ((error = xfs_bmap_add_extent_delay_real(ip,
656 idx, &cur, new, &da_new, first, flist,
657 &logflags, delta, rsvd)))
658 goto done;
659 } else if (new->br_state == XFS_EXT_NORM) {
660 ASSERT(new->br_state == XFS_EXT_NORM);
661 if ((error = xfs_bmap_add_extent_unwritten_real(
662 ip, idx, &cur, new, &logflags, delta)))
663 goto done;
664 } else {
665 ASSERT(new->br_state == XFS_EXT_UNWRITTEN);
666 if ((error = xfs_bmap_add_extent_unwritten_real(
667 ip, idx, &cur, new, &logflags, delta)))
668 goto done;
669 }
670 ASSERT(*curp == cur || *curp == NULL);
671 }
672 /*
673 * Otherwise we're filling in a hole with an allocation.
674 */
675 else {
676 if (cur)
677 ASSERT((cur->bc_private.b.flags &
678 XFS_BTCUR_BPRV_WASDEL) == 0);
679 if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur,
680 new, &logflags, delta, whichfork)))
681 goto done;
682 }
683 }
684
685 ASSERT(*curp == cur || *curp == NULL);
686 /*
687 * Convert to a btree if necessary.
688 */
689 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
690 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
691 int tmp_logflags; /* partial log flag return val */
692
693 ASSERT(cur == NULL);
694 error = xfs_bmap_extents_to_btree(ip->i_transp, ip, first,
695 flist, &cur, da_old > 0, &tmp_logflags, whichfork);
696 logflags |= tmp_logflags;
697 if (error)
698 goto done;
699 }
700 /*
701 * Adjust for changes in reserved delayed indirect blocks.
702 * Nothing to do for disk quotas here.
703 */
704 if (da_old || da_new) {
705 xfs_filblks_t nblks;
706
707 nblks = da_new;
708 if (cur)
709 nblks += cur->bc_private.b.allocated;
710 ASSERT(nblks <= da_old);
711 if (nblks < da_old)
712 xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
713 (int64_t)(da_old - nblks), rsvd);
714 }
715 /*
716 * Clear out the allocated field, done with it now in any case.
717 */
718 if (cur) {
719 cur->bc_private.b.allocated = 0;
720 *curp = cur;
721 }
722 done:
723 #ifdef DEBUG
724 if (!error)
725 xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
726 #endif
727 *logflagsp = logflags;
728 return error;
729 }
730
731 /*
732 * Called by xfs_bmap_add_extent to handle cases converting a delayed
733 * allocation to a real allocation.
734 */
735 STATIC int /* error */
736 xfs_bmap_add_extent_delay_real(
737 xfs_inode_t *ip, /* incore inode pointer */
738 xfs_extnum_t idx, /* extent number to update/insert */
739 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
740 xfs_bmbt_irec_t *new, /* new data to add to file extents */
741 xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
742 xfs_fsblock_t *first, /* pointer to firstblock variable */
743 xfs_bmap_free_t *flist, /* list of extents to be freed */
744 int *logflagsp, /* inode logging flags */
745 xfs_extdelta_t *delta, /* Change made to incore extents */
746 int rsvd) /* OK to use reserved data block allocation */
747 {
748 xfs_btree_cur_t *cur; /* btree cursor */
749 int diff; /* temp value */
750 xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
751 int error; /* error return value */
752 int i; /* temp state */
753 xfs_ifork_t *ifp; /* inode fork pointer */
754 xfs_fileoff_t new_endoff; /* end offset of new entry */
755 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
756 /* left is 0, right is 1, prev is 2 */
757 int rval=0; /* return value (logging flags) */
758 int state = 0;/* state bits, accessed thru macros */
759 xfs_filblks_t temp=0; /* value for dnew calculations */
760 xfs_filblks_t temp2=0;/* value for dnew calculations */
761 int tmp_rval; /* partial logging flags */
762 enum { /* bit number definitions for state */
763 LEFT_CONTIG, RIGHT_CONTIG,
764 LEFT_FILLING, RIGHT_FILLING,
765 LEFT_DELAY, RIGHT_DELAY,
766 LEFT_VALID, RIGHT_VALID
767 };
768
769 #define LEFT r[0]
770 #define RIGHT r[1]
771 #define PREV r[2]
772 #define MASK(b) (1 << (b))
773 #define MASK2(a,b) (MASK(a) | MASK(b))
774 #define MASK3(a,b,c) (MASK2(a,b) | MASK(c))
775 #define MASK4(a,b,c,d) (MASK3(a,b,c) | MASK(d))
776 #define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
777 #define STATE_TEST(b) (state & MASK(b))
778 #define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
779 ((state &= ~MASK(b)), 0))
780 #define SWITCH_STATE \
781 (state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
782
783 /*
784 * Set up a bunch of variables to make the tests simpler.
785 */
786 cur = *curp;
787 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
788 ep = xfs_iext_get_ext(ifp, idx);
789 xfs_bmbt_get_all(ep, &PREV);
790 new_endoff = new->br_startoff + new->br_blockcount;
791 ASSERT(PREV.br_startoff <= new->br_startoff);
792 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
793 /*
794 * Set flags determining what part of the previous delayed allocation
795 * extent is being replaced by a real allocation.
796 */
797 STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
798 STATE_SET(RIGHT_FILLING,
799 PREV.br_startoff + PREV.br_blockcount == new_endoff);
800 /*
801 * Check and set flags if this segment has a left neighbor.
802 * Don't set contiguous if the combined extent would be too large.
803 */
804 if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
805 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &LEFT);
806 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
807 }
808 STATE_SET(LEFT_CONTIG,
809 STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
810 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
811 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
812 LEFT.br_state == new->br_state &&
813 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
814 /*
815 * Check and set flags if this segment has a right neighbor.
816 * Don't set contiguous if the combined extent would be too large.
817 * Also check for all-three-contiguous being too large.
818 */
819 if (STATE_SET_TEST(RIGHT_VALID,
820 idx <
821 ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
822 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx + 1), &RIGHT);
823 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
824 }
825 STATE_SET(RIGHT_CONTIG,
826 STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
827 new_endoff == RIGHT.br_startoff &&
828 new->br_startblock + new->br_blockcount ==
829 RIGHT.br_startblock &&
830 new->br_state == RIGHT.br_state &&
831 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
832 ((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
833 MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
834 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
835 <= MAXEXTLEN));
836 error = 0;
837 /*
838 * Switch out based on the FILLING and CONTIG state bits.
839 */
840 switch (SWITCH_STATE) {
841
842 case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
843 /*
844 * Filling in all of a previously delayed allocation extent.
845 * The left and right neighbors are both contiguous with new.
846 */
847 XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|LC|RC", ip, idx - 1,
848 XFS_DATA_FORK);
849 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
850 LEFT.br_blockcount + PREV.br_blockcount +
851 RIGHT.br_blockcount);
852 XFS_BMAP_TRACE_POST_UPDATE("LF|RF|LC|RC", ip, idx - 1,
853 XFS_DATA_FORK);
854 XFS_BMAP_TRACE_DELETE("LF|RF|LC|RC", ip, idx, 2, XFS_DATA_FORK);
855 xfs_iext_remove(ifp, idx, 2);
856 ip->i_df.if_lastex = idx - 1;
857 ip->i_d.di_nextents--;
858 if (cur == NULL)
859 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
860 else {
861 rval = XFS_ILOG_CORE;
862 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
863 RIGHT.br_startblock,
864 RIGHT.br_blockcount, &i)))
865 goto done;
866 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
867 if ((error = xfs_btree_delete(cur, &i)))
868 goto done;
869 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
870 if ((error = xfs_btree_decrement(cur, 0, &i)))
871 goto done;
872 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
873 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
874 LEFT.br_startblock,
875 LEFT.br_blockcount +
876 PREV.br_blockcount +
877 RIGHT.br_blockcount, LEFT.br_state)))
878 goto done;
879 }
880 *dnew = 0;
881 /* DELTA: Three in-core extents are replaced by one. */
882 temp = LEFT.br_startoff;
883 temp2 = LEFT.br_blockcount +
884 PREV.br_blockcount +
885 RIGHT.br_blockcount;
886 break;
887
888 case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
889 /*
890 * Filling in all of a previously delayed allocation extent.
891 * The left neighbor is contiguous, the right is not.
892 */
893 XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|LC", ip, idx - 1,
894 XFS_DATA_FORK);
895 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
896 LEFT.br_blockcount + PREV.br_blockcount);
897 XFS_BMAP_TRACE_POST_UPDATE("LF|RF|LC", ip, idx - 1,
898 XFS_DATA_FORK);
899 ip->i_df.if_lastex = idx - 1;
900 XFS_BMAP_TRACE_DELETE("LF|RF|LC", ip, idx, 1, XFS_DATA_FORK);
901 xfs_iext_remove(ifp, idx, 1);
902 if (cur == NULL)
903 rval = XFS_ILOG_DEXT;
904 else {
905 rval = 0;
906 if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
907 LEFT.br_startblock, LEFT.br_blockcount,
908 &i)))
909 goto done;
910 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
911 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
912 LEFT.br_startblock,
913 LEFT.br_blockcount +
914 PREV.br_blockcount, LEFT.br_state)))
915 goto done;
916 }
917 *dnew = 0;
918 /* DELTA: Two in-core extents are replaced by one. */
919 temp = LEFT.br_startoff;
920 temp2 = LEFT.br_blockcount +
921 PREV.br_blockcount;
922 break;
923
924 case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
925 /*
926 * Filling in all of a previously delayed allocation extent.
927 * The right neighbor is contiguous, the left is not.
928 */
929 XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|RC", ip, idx, XFS_DATA_FORK);
930 xfs_bmbt_set_startblock(ep, new->br_startblock);
931 xfs_bmbt_set_blockcount(ep,
932 PREV.br_blockcount + RIGHT.br_blockcount);
933 XFS_BMAP_TRACE_POST_UPDATE("LF|RF|RC", ip, idx, XFS_DATA_FORK);
934 ip->i_df.if_lastex = idx;
935 XFS_BMAP_TRACE_DELETE("LF|RF|RC", ip, idx + 1, 1, XFS_DATA_FORK);
936 xfs_iext_remove(ifp, idx + 1, 1);
937 if (cur == NULL)
938 rval = XFS_ILOG_DEXT;
939 else {
940 rval = 0;
941 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
942 RIGHT.br_startblock,
943 RIGHT.br_blockcount, &i)))
944 goto done;
945 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
946 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
947 new->br_startblock,
948 PREV.br_blockcount +
949 RIGHT.br_blockcount, PREV.br_state)))
950 goto done;
951 }
952 *dnew = 0;
953 /* DELTA: Two in-core extents are replaced by one. */
954 temp = PREV.br_startoff;
955 temp2 = PREV.br_blockcount +
956 RIGHT.br_blockcount;
957 break;
958
959 case MASK2(LEFT_FILLING, RIGHT_FILLING):
960 /*
961 * Filling in all of a previously delayed allocation extent.
962 * Neither the left nor right neighbors are contiguous with
963 * the new one.
964 */
965 XFS_BMAP_TRACE_PRE_UPDATE("LF|RF", ip, idx, XFS_DATA_FORK);
966 xfs_bmbt_set_startblock(ep, new->br_startblock);
967 XFS_BMAP_TRACE_POST_UPDATE("LF|RF", ip, idx, XFS_DATA_FORK);
968 ip->i_df.if_lastex = idx;
969 ip->i_d.di_nextents++;
970 if (cur == NULL)
971 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
972 else {
973 rval = XFS_ILOG_CORE;
974 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
975 new->br_startblock, new->br_blockcount,
976 &i)))
977 goto done;
978 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
979 cur->bc_rec.b.br_state = XFS_EXT_NORM;
980 if ((error = xfs_btree_insert(cur, &i)))
981 goto done;
982 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
983 }
984 *dnew = 0;
985 /* DELTA: The in-core extent described by new changed type. */
986 temp = new->br_startoff;
987 temp2 = new->br_blockcount;
988 break;
989
990 case MASK2(LEFT_FILLING, LEFT_CONTIG):
991 /*
992 * Filling in the first part of a previous delayed allocation.
993 * The left neighbor is contiguous.
994 */
995 XFS_BMAP_TRACE_PRE_UPDATE("LF|LC", ip, idx - 1, XFS_DATA_FORK);
996 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
997 LEFT.br_blockcount + new->br_blockcount);
998 xfs_bmbt_set_startoff(ep,
999 PREV.br_startoff + new->br_blockcount);
1000 XFS_BMAP_TRACE_POST_UPDATE("LF|LC", ip, idx - 1, XFS_DATA_FORK);
1001 temp = PREV.br_blockcount - new->br_blockcount;
1002 XFS_BMAP_TRACE_PRE_UPDATE("LF|LC", ip, idx, XFS_DATA_FORK);
1003 xfs_bmbt_set_blockcount(ep, temp);
1004 ip->i_df.if_lastex = idx - 1;
1005 if (cur == NULL)
1006 rval = XFS_ILOG_DEXT;
1007 else {
1008 rval = 0;
1009 if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
1010 LEFT.br_startblock, LEFT.br_blockcount,
1011 &i)))
1012 goto done;
1013 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1014 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1015 LEFT.br_startblock,
1016 LEFT.br_blockcount +
1017 new->br_blockcount,
1018 LEFT.br_state)))
1019 goto done;
1020 }
1021 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1022 STARTBLOCKVAL(PREV.br_startblock));
1023 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1024 XFS_BMAP_TRACE_POST_UPDATE("LF|LC", ip, idx, XFS_DATA_FORK);
1025 *dnew = temp;
1026 /* DELTA: The boundary between two in-core extents moved. */
1027 temp = LEFT.br_startoff;
1028 temp2 = LEFT.br_blockcount +
1029 PREV.br_blockcount;
1030 break;
1031
1032 case MASK(LEFT_FILLING):
1033 /*
1034 * Filling in the first part of a previous delayed allocation.
1035 * The left neighbor is not contiguous.
1036 */
1037 XFS_BMAP_TRACE_PRE_UPDATE("LF", ip, idx, XFS_DATA_FORK);
1038 xfs_bmbt_set_startoff(ep, new_endoff);
1039 temp = PREV.br_blockcount - new->br_blockcount;
1040 xfs_bmbt_set_blockcount(ep, temp);
1041 XFS_BMAP_TRACE_INSERT("LF", ip, idx, 1, new, NULL,
1042 XFS_DATA_FORK);
1043 xfs_iext_insert(ifp, idx, 1, new);
1044 ip->i_df.if_lastex = idx;
1045 ip->i_d.di_nextents++;
1046 if (cur == NULL)
1047 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1048 else {
1049 rval = XFS_ILOG_CORE;
1050 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1051 new->br_startblock, new->br_blockcount,
1052 &i)))
1053 goto done;
1054 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1055 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1056 if ((error = xfs_btree_insert(cur, &i)))
1057 goto done;
1058 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1059 }
1060 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1061 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1062 error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
1063 first, flist, &cur, 1, &tmp_rval,
1064 XFS_DATA_FORK);
1065 rval |= tmp_rval;
1066 if (error)
1067 goto done;
1068 }
1069 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1070 STARTBLOCKVAL(PREV.br_startblock) -
1071 (cur ? cur->bc_private.b.allocated : 0));
1072 ep = xfs_iext_get_ext(ifp, idx + 1);
1073 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1074 XFS_BMAP_TRACE_POST_UPDATE("LF", ip, idx + 1, XFS_DATA_FORK);
1075 *dnew = temp;
1076 /* DELTA: One in-core extent is split in two. */
1077 temp = PREV.br_startoff;
1078 temp2 = PREV.br_blockcount;
1079 break;
1080
1081 case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
1082 /*
1083 * Filling in the last part of a previous delayed allocation.
1084 * The right neighbor is contiguous with the new allocation.
1085 */
1086 temp = PREV.br_blockcount - new->br_blockcount;
1087 XFS_BMAP_TRACE_PRE_UPDATE("RF|RC", ip, idx, XFS_DATA_FORK);
1088 XFS_BMAP_TRACE_PRE_UPDATE("RF|RC", ip, idx + 1, XFS_DATA_FORK);
1089 xfs_bmbt_set_blockcount(ep, temp);
1090 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, idx + 1),
1091 new->br_startoff, new->br_startblock,
1092 new->br_blockcount + RIGHT.br_blockcount,
1093 RIGHT.br_state);
1094 XFS_BMAP_TRACE_POST_UPDATE("RF|RC", ip, idx + 1, XFS_DATA_FORK);
1095 ip->i_df.if_lastex = idx + 1;
1096 if (cur == NULL)
1097 rval = XFS_ILOG_DEXT;
1098 else {
1099 rval = 0;
1100 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1101 RIGHT.br_startblock,
1102 RIGHT.br_blockcount, &i)))
1103 goto done;
1104 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1105 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1106 new->br_startblock,
1107 new->br_blockcount +
1108 RIGHT.br_blockcount,
1109 RIGHT.br_state)))
1110 goto done;
1111 }
1112 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1113 STARTBLOCKVAL(PREV.br_startblock));
1114 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1115 XFS_BMAP_TRACE_POST_UPDATE("RF|RC", ip, idx, XFS_DATA_FORK);
1116 *dnew = temp;
1117 /* DELTA: The boundary between two in-core extents moved. */
1118 temp = PREV.br_startoff;
1119 temp2 = PREV.br_blockcount +
1120 RIGHT.br_blockcount;
1121 break;
1122
1123 case MASK(RIGHT_FILLING):
1124 /*
1125 * Filling in the last part of a previous delayed allocation.
1126 * The right neighbor is not contiguous.
1127 */
1128 temp = PREV.br_blockcount - new->br_blockcount;
1129 XFS_BMAP_TRACE_PRE_UPDATE("RF", ip, idx, XFS_DATA_FORK);
1130 xfs_bmbt_set_blockcount(ep, temp);
1131 XFS_BMAP_TRACE_INSERT("RF", ip, idx + 1, 1, new, NULL,
1132 XFS_DATA_FORK);
1133 xfs_iext_insert(ifp, idx + 1, 1, new);
1134 ip->i_df.if_lastex = idx + 1;
1135 ip->i_d.di_nextents++;
1136 if (cur == NULL)
1137 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1138 else {
1139 rval = XFS_ILOG_CORE;
1140 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1141 new->br_startblock, new->br_blockcount,
1142 &i)))
1143 goto done;
1144 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1145 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1146 if ((error = xfs_btree_insert(cur, &i)))
1147 goto done;
1148 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1149 }
1150 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1151 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1152 error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
1153 first, flist, &cur, 1, &tmp_rval,
1154 XFS_DATA_FORK);
1155 rval |= tmp_rval;
1156 if (error)
1157 goto done;
1158 }
1159 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1160 STARTBLOCKVAL(PREV.br_startblock) -
1161 (cur ? cur->bc_private.b.allocated : 0));
1162 ep = xfs_iext_get_ext(ifp, idx);
1163 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1164 XFS_BMAP_TRACE_POST_UPDATE("RF", ip, idx, XFS_DATA_FORK);
1165 *dnew = temp;
1166 /* DELTA: One in-core extent is split in two. */
1167 temp = PREV.br_startoff;
1168 temp2 = PREV.br_blockcount;
1169 break;
1170
1171 case 0:
1172 /*
1173 * Filling in the middle part of a previous delayed allocation.
1174 * Contiguity is impossible here.
1175 * This case is avoided almost all the time.
1176 */
1177 temp = new->br_startoff - PREV.br_startoff;
1178 XFS_BMAP_TRACE_PRE_UPDATE("0", ip, idx, XFS_DATA_FORK);
1179 xfs_bmbt_set_blockcount(ep, temp);
1180 r[0] = *new;
1181 r[1].br_state = PREV.br_state;
1182 r[1].br_startblock = 0;
1183 r[1].br_startoff = new_endoff;
1184 temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
1185 r[1].br_blockcount = temp2;
1186 XFS_BMAP_TRACE_INSERT("0", ip, idx + 1, 2, &r[0], &r[1],
1187 XFS_DATA_FORK);
1188 xfs_iext_insert(ifp, idx + 1, 2, &r[0]);
1189 ip->i_df.if_lastex = idx + 1;
1190 ip->i_d.di_nextents++;
1191 if (cur == NULL)
1192 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1193 else {
1194 rval = XFS_ILOG_CORE;
1195 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1196 new->br_startblock, new->br_blockcount,
1197 &i)))
1198 goto done;
1199 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1200 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1201 if ((error = xfs_btree_insert(cur, &i)))
1202 goto done;
1203 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1204 }
1205 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1206 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1207 error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
1208 first, flist, &cur, 1, &tmp_rval,
1209 XFS_DATA_FORK);
1210 rval |= tmp_rval;
1211 if (error)
1212 goto done;
1213 }
1214 temp = xfs_bmap_worst_indlen(ip, temp);
1215 temp2 = xfs_bmap_worst_indlen(ip, temp2);
1216 diff = (int)(temp + temp2 - STARTBLOCKVAL(PREV.br_startblock) -
1217 (cur ? cur->bc_private.b.allocated : 0));
1218 if (diff > 0 &&
1219 xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS, -((int64_t)diff), rsvd)) {
1220 /*
1221 * Ick gross gag me with a spoon.
1222 */
1223 ASSERT(0); /* want to see if this ever happens! */
1224 while (diff > 0) {
1225 if (temp) {
1226 temp--;
1227 diff--;
1228 if (!diff ||
1229 !xfs_mod_incore_sb(ip->i_mount,
1230 XFS_SBS_FDBLOCKS, -((int64_t)diff), rsvd))
1231 break;
1232 }
1233 if (temp2) {
1234 temp2--;
1235 diff--;
1236 if (!diff ||
1237 !xfs_mod_incore_sb(ip->i_mount,
1238 XFS_SBS_FDBLOCKS, -((int64_t)diff), rsvd))
1239 break;
1240 }
1241 }
1242 }
1243 ep = xfs_iext_get_ext(ifp, idx);
1244 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1245 XFS_BMAP_TRACE_POST_UPDATE("0", ip, idx, XFS_DATA_FORK);
1246 XFS_BMAP_TRACE_PRE_UPDATE("0", ip, idx + 2, XFS_DATA_FORK);
1247 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, idx + 2),
1248 NULLSTARTBLOCK((int)temp2));
1249 XFS_BMAP_TRACE_POST_UPDATE("0", ip, idx + 2, XFS_DATA_FORK);
1250 *dnew = temp + temp2;
1251 /* DELTA: One in-core extent is split in three. */
1252 temp = PREV.br_startoff;
1253 temp2 = PREV.br_blockcount;
1254 break;
1255
1256 case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1257 case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1258 case MASK2(LEFT_FILLING, RIGHT_CONTIG):
1259 case MASK2(RIGHT_FILLING, LEFT_CONTIG):
1260 case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
1261 case MASK(LEFT_CONTIG):
1262 case MASK(RIGHT_CONTIG):
1263 /*
1264 * These cases are all impossible.
1265 */
1266 ASSERT(0);
1267 }
1268 *curp = cur;
1269 if (delta) {
1270 temp2 += temp;
1271 if (delta->xed_startoff > temp)
1272 delta->xed_startoff = temp;
1273 if (delta->xed_blockcount < temp2)
1274 delta->xed_blockcount = temp2;
1275 }
1276 done:
1277 *logflagsp = rval;
1278 return error;
1279 #undef LEFT
1280 #undef RIGHT
1281 #undef PREV
1282 #undef MASK
1283 #undef MASK2
1284 #undef MASK3
1285 #undef MASK4
1286 #undef STATE_SET
1287 #undef STATE_TEST
1288 #undef STATE_SET_TEST
1289 #undef SWITCH_STATE
1290 }
1291
1292 /*
1293 * Called by xfs_bmap_add_extent to handle cases converting an unwritten
1294 * allocation to a real allocation or vice versa.
1295 */
1296 STATIC int /* error */
1297 xfs_bmap_add_extent_unwritten_real(
1298 xfs_inode_t *ip, /* incore inode pointer */
1299 xfs_extnum_t idx, /* extent number to update/insert */
1300 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
1301 xfs_bmbt_irec_t *new, /* new data to add to file extents */
1302 int *logflagsp, /* inode logging flags */
1303 xfs_extdelta_t *delta) /* Change made to incore extents */
1304 {
1305 xfs_btree_cur_t *cur; /* btree cursor */
1306 xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
1307 int error; /* error return value */
1308 int i; /* temp state */
1309 xfs_ifork_t *ifp; /* inode fork pointer */
1310 xfs_fileoff_t new_endoff; /* end offset of new entry */
1311 xfs_exntst_t newext; /* new extent state */
1312 xfs_exntst_t oldext; /* old extent state */
1313 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
1314 /* left is 0, right is 1, prev is 2 */
1315 int rval=0; /* return value (logging flags) */
1316 int state = 0;/* state bits, accessed thru macros */
1317 xfs_filblks_t temp=0;
1318 xfs_filblks_t temp2=0;
1319 enum { /* bit number definitions for state */
1320 LEFT_CONTIG, RIGHT_CONTIG,
1321 LEFT_FILLING, RIGHT_FILLING,
1322 LEFT_DELAY, RIGHT_DELAY,
1323 LEFT_VALID, RIGHT_VALID
1324 };
1325
1326 #define LEFT r[0]
1327 #define RIGHT r[1]
1328 #define PREV r[2]
1329 #define MASK(b) (1 << (b))
1330 #define MASK2(a,b) (MASK(a) | MASK(b))
1331 #define MASK3(a,b,c) (MASK2(a,b) | MASK(c))
1332 #define MASK4(a,b,c,d) (MASK3(a,b,c) | MASK(d))
1333 #define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
1334 #define STATE_TEST(b) (state & MASK(b))
1335 #define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
1336 ((state &= ~MASK(b)), 0))
1337 #define SWITCH_STATE \
1338 (state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
1339
1340 /*
1341 * Set up a bunch of variables to make the tests simpler.
1342 */
1343 error = 0;
1344 cur = *curp;
1345 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1346 ep = xfs_iext_get_ext(ifp, idx);
1347 xfs_bmbt_get_all(ep, &PREV);
1348 newext = new->br_state;
1349 oldext = (newext == XFS_EXT_UNWRITTEN) ?
1350 XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
1351 ASSERT(PREV.br_state == oldext);
1352 new_endoff = new->br_startoff + new->br_blockcount;
1353 ASSERT(PREV.br_startoff <= new->br_startoff);
1354 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
1355 /*
1356 * Set flags determining what part of the previous oldext allocation
1357 * extent is being replaced by a newext allocation.
1358 */
1359 STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
1360 STATE_SET(RIGHT_FILLING,
1361 PREV.br_startoff + PREV.br_blockcount == new_endoff);
1362 /*
1363 * Check and set flags if this segment has a left neighbor.
1364 * Don't set contiguous if the combined extent would be too large.
1365 */
1366 if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
1367 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &LEFT);
1368 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
1369 }
1370 STATE_SET(LEFT_CONTIG,
1371 STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
1372 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
1373 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
1374 LEFT.br_state == newext &&
1375 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
1376 /*
1377 * Check and set flags if this segment has a right neighbor.
1378 * Don't set contiguous if the combined extent would be too large.
1379 * Also check for all-three-contiguous being too large.
1380 */
1381 if (STATE_SET_TEST(RIGHT_VALID,
1382 idx <
1383 ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
1384 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx + 1), &RIGHT);
1385 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
1386 }
1387 STATE_SET(RIGHT_CONTIG,
1388 STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
1389 new_endoff == RIGHT.br_startoff &&
1390 new->br_startblock + new->br_blockcount ==
1391 RIGHT.br_startblock &&
1392 newext == RIGHT.br_state &&
1393 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
1394 ((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
1395 MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
1396 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
1397 <= MAXEXTLEN));
1398 /*
1399 * Switch out based on the FILLING and CONTIG state bits.
1400 */
1401 switch (SWITCH_STATE) {
1402
1403 case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1404 /*
1405 * Setting all of a previous oldext extent to newext.
1406 * The left and right neighbors are both contiguous with new.
1407 */
1408 XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|LC|RC", ip, idx - 1,
1409 XFS_DATA_FORK);
1410 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
1411 LEFT.br_blockcount + PREV.br_blockcount +
1412 RIGHT.br_blockcount);
1413 XFS_BMAP_TRACE_POST_UPDATE("LF|RF|LC|RC", ip, idx - 1,
1414 XFS_DATA_FORK);
1415 XFS_BMAP_TRACE_DELETE("LF|RF|LC|RC", ip, idx, 2, XFS_DATA_FORK);
1416 xfs_iext_remove(ifp, idx, 2);
1417 ip->i_df.if_lastex = idx - 1;
1418 ip->i_d.di_nextents -= 2;
1419 if (cur == NULL)
1420 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1421 else {
1422 rval = XFS_ILOG_CORE;
1423 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1424 RIGHT.br_startblock,
1425 RIGHT.br_blockcount, &i)))
1426 goto done;
1427 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1428 if ((error = xfs_btree_delete(cur, &i)))
1429 goto done;
1430 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1431 if ((error = xfs_btree_decrement(cur, 0, &i)))
1432 goto done;
1433 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1434 if ((error = xfs_btree_delete(cur, &i)))
1435 goto done;
1436 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1437 if ((error = xfs_btree_decrement(cur, 0, &i)))
1438 goto done;
1439 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1440 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1441 LEFT.br_startblock,
1442 LEFT.br_blockcount + PREV.br_blockcount +
1443 RIGHT.br_blockcount, LEFT.br_state)))
1444 goto done;
1445 }
1446 /* DELTA: Three in-core extents are replaced by one. */
1447 temp = LEFT.br_startoff;
1448 temp2 = LEFT.br_blockcount +
1449 PREV.br_blockcount +
1450 RIGHT.br_blockcount;
1451 break;
1452
1453 case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
1454 /*
1455 * Setting all of a previous oldext extent to newext.
1456 * The left neighbor is contiguous, the right is not.
1457 */
1458 XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|LC", ip, idx - 1,
1459 XFS_DATA_FORK);
1460 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
1461 LEFT.br_blockcount + PREV.br_blockcount);
1462 XFS_BMAP_TRACE_POST_UPDATE("LF|RF|LC", ip, idx - 1,
1463 XFS_DATA_FORK);
1464 ip->i_df.if_lastex = idx - 1;
1465 XFS_BMAP_TRACE_DELETE("LF|RF|LC", ip, idx, 1, XFS_DATA_FORK);
1466 xfs_iext_remove(ifp, idx, 1);
1467 ip->i_d.di_nextents--;
1468 if (cur == NULL)
1469 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1470 else {
1471 rval = XFS_ILOG_CORE;
1472 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1473 PREV.br_startblock, PREV.br_blockcount,
1474 &i)))
1475 goto done;
1476 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1477 if ((error = xfs_btree_delete(cur, &i)))
1478 goto done;
1479 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1480 if ((error = xfs_btree_decrement(cur, 0, &i)))
1481 goto done;
1482 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1483 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1484 LEFT.br_startblock,
1485 LEFT.br_blockcount + PREV.br_blockcount,
1486 LEFT.br_state)))
1487 goto done;
1488 }
1489 /* DELTA: Two in-core extents are replaced by one. */
1490 temp = LEFT.br_startoff;
1491 temp2 = LEFT.br_blockcount +
1492 PREV.br_blockcount;
1493 break;
1494
1495 case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
1496 /*
1497 * Setting all of a previous oldext extent to newext.
1498 * The right neighbor is contiguous, the left is not.
1499 */
1500 XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|RC", ip, idx,
1501 XFS_DATA_FORK);
1502 xfs_bmbt_set_blockcount(ep,
1503 PREV.br_blockcount + RIGHT.br_blockcount);
1504 xfs_bmbt_set_state(ep, newext);
1505 XFS_BMAP_TRACE_POST_UPDATE("LF|RF|RC", ip, idx,
1506 XFS_DATA_FORK);
1507 ip->i_df.if_lastex = idx;
1508 XFS_BMAP_TRACE_DELETE("LF|RF|RC", ip, idx + 1, 1, XFS_DATA_FORK);
1509 xfs_iext_remove(ifp, idx + 1, 1);
1510 ip->i_d.di_nextents--;
1511 if (cur == NULL)
1512 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1513 else {
1514 rval = XFS_ILOG_CORE;
1515 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1516 RIGHT.br_startblock,
1517 RIGHT.br_blockcount, &i)))
1518 goto done;
1519 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1520 if ((error = xfs_btree_delete(cur, &i)))
1521 goto done;
1522 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1523 if ((error = xfs_btree_decrement(cur, 0, &i)))
1524 goto done;
1525 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1526 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1527 new->br_startblock,
1528 new->br_blockcount + RIGHT.br_blockcount,
1529 newext)))
1530 goto done;
1531 }
1532 /* DELTA: Two in-core extents are replaced by one. */
1533 temp = PREV.br_startoff;
1534 temp2 = PREV.br_blockcount +
1535 RIGHT.br_blockcount;
1536 break;
1537
1538 case MASK2(LEFT_FILLING, RIGHT_FILLING):
1539 /*
1540 * Setting all of a previous oldext extent to newext.
1541 * Neither the left nor right neighbors are contiguous with
1542 * the new one.
1543 */
1544 XFS_BMAP_TRACE_PRE_UPDATE("LF|RF", ip, idx,
1545 XFS_DATA_FORK);
1546 xfs_bmbt_set_state(ep, newext);
1547 XFS_BMAP_TRACE_POST_UPDATE("LF|RF", ip, idx,
1548 XFS_DATA_FORK);
1549 ip->i_df.if_lastex = idx;
1550 if (cur == NULL)
1551 rval = XFS_ILOG_DEXT;
1552 else {
1553 rval = 0;
1554 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1555 new->br_startblock, new->br_blockcount,
1556 &i)))
1557 goto done;
1558 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1559 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1560 new->br_startblock, new->br_blockcount,
1561 newext)))
1562 goto done;
1563 }
1564 /* DELTA: The in-core extent described by new changed type. */
1565 temp = new->br_startoff;
1566 temp2 = new->br_blockcount;
1567 break;
1568
1569 case MASK2(LEFT_FILLING, LEFT_CONTIG):
1570 /*
1571 * Setting the first part of a previous oldext extent to newext.
1572 * The left neighbor is contiguous.
1573 */
1574 XFS_BMAP_TRACE_PRE_UPDATE("LF|LC", ip, idx - 1,
1575 XFS_DATA_FORK);
1576 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
1577 LEFT.br_blockcount + new->br_blockcount);
1578 xfs_bmbt_set_startoff(ep,
1579 PREV.br_startoff + new->br_blockcount);
1580 XFS_BMAP_TRACE_POST_UPDATE("LF|LC", ip, idx - 1,
1581 XFS_DATA_FORK);
1582 XFS_BMAP_TRACE_PRE_UPDATE("LF|LC", ip, idx,
1583 XFS_DATA_FORK);
1584 xfs_bmbt_set_startblock(ep,
1585 new->br_startblock + new->br_blockcount);
1586 xfs_bmbt_set_blockcount(ep,
1587 PREV.br_blockcount - new->br_blockcount);
1588 XFS_BMAP_TRACE_POST_UPDATE("LF|LC", ip, idx,
1589 XFS_DATA_FORK);
1590 ip->i_df.if_lastex = idx - 1;
1591 if (cur == NULL)
1592 rval = XFS_ILOG_DEXT;
1593 else {
1594 rval = 0;
1595 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1596 PREV.br_startblock, PREV.br_blockcount,
1597 &i)))
1598 goto done;
1599 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1600 if ((error = xfs_bmbt_update(cur,
1601 PREV.br_startoff + new->br_blockcount,
1602 PREV.br_startblock + new->br_blockcount,
1603 PREV.br_blockcount - new->br_blockcount,
1604 oldext)))
1605 goto done;
1606 if ((error = xfs_btree_decrement(cur, 0, &i)))
1607 goto done;
1608 if (xfs_bmbt_update(cur, LEFT.br_startoff,
1609 LEFT.br_startblock,
1610 LEFT.br_blockcount + new->br_blockcount,
1611 LEFT.br_state))
1612 goto done;
1613 }
1614 /* DELTA: The boundary between two in-core extents moved. */
1615 temp = LEFT.br_startoff;
1616 temp2 = LEFT.br_blockcount +
1617 PREV.br_blockcount;
1618 break;
1619
1620 case MASK(LEFT_FILLING):
1621 /*
1622 * Setting the first part of a previous oldext extent to newext.
1623 * The left neighbor is not contiguous.
1624 */
1625 XFS_BMAP_TRACE_PRE_UPDATE("LF", ip, idx, XFS_DATA_FORK);
1626 ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
1627 xfs_bmbt_set_startoff(ep, new_endoff);
1628 xfs_bmbt_set_blockcount(ep,
1629 PREV.br_blockcount - new->br_blockcount);
1630 xfs_bmbt_set_startblock(ep,
1631 new->br_startblock + new->br_blockcount);
1632 XFS_BMAP_TRACE_POST_UPDATE("LF", ip, idx, XFS_DATA_FORK);
1633 XFS_BMAP_TRACE_INSERT("LF", ip, idx, 1, new, NULL,
1634 XFS_DATA_FORK);
1635 xfs_iext_insert(ifp, idx, 1, new);
1636 ip->i_df.if_lastex = idx;
1637 ip->i_d.di_nextents++;
1638 if (cur == NULL)
1639 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1640 else {
1641 rval = XFS_ILOG_CORE;
1642 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1643 PREV.br_startblock, PREV.br_blockcount,
1644 &i)))
1645 goto done;
1646 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1647 if ((error = xfs_bmbt_update(cur,
1648 PREV.br_startoff + new->br_blockcount,
1649 PREV.br_startblock + new->br_blockcount,
1650 PREV.br_blockcount - new->br_blockcount,
1651 oldext)))
1652 goto done;
1653 cur->bc_rec.b = *new;
1654 if ((error = xfs_btree_insert(cur, &i)))
1655 goto done;
1656 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1657 }
1658 /* DELTA: One in-core extent is split in two. */
1659 temp = PREV.br_startoff;
1660 temp2 = PREV.br_blockcount;
1661 break;
1662
1663 case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
1664 /*
1665 * Setting the last part of a previous oldext extent to newext.
1666 * The right neighbor is contiguous with the new allocation.
1667 */
1668 XFS_BMAP_TRACE_PRE_UPDATE("RF|RC", ip, idx,
1669 XFS_DATA_FORK);
1670 XFS_BMAP_TRACE_PRE_UPDATE("RF|RC", ip, idx + 1,
1671 XFS_DATA_FORK);
1672 xfs_bmbt_set_blockcount(ep,
1673 PREV.br_blockcount - new->br_blockcount);
1674 XFS_BMAP_TRACE_POST_UPDATE("RF|RC", ip, idx,
1675 XFS_DATA_FORK);
1676 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, idx + 1),
1677 new->br_startoff, new->br_startblock,
1678 new->br_blockcount + RIGHT.br_blockcount, newext);
1679 XFS_BMAP_TRACE_POST_UPDATE("RF|RC", ip, idx + 1,
1680 XFS_DATA_FORK);
1681 ip->i_df.if_lastex = idx + 1;
1682 if (cur == NULL)
1683 rval = XFS_ILOG_DEXT;
1684 else {
1685 rval = 0;
1686 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1687 PREV.br_startblock,
1688 PREV.br_blockcount, &i)))
1689 goto done;
1690 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1691 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1692 PREV.br_startblock,
1693 PREV.br_blockcount - new->br_blockcount,
1694 oldext)))
1695 goto done;
1696 if ((error = xfs_btree_increment(cur, 0, &i)))
1697 goto done;
1698 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1699 new->br_startblock,
1700 new->br_blockcount + RIGHT.br_blockcount,
1701 newext)))
1702 goto done;
1703 }
1704 /* DELTA: The boundary between two in-core extents moved. */
1705 temp = PREV.br_startoff;
1706 temp2 = PREV.br_blockcount +
1707 RIGHT.br_blockcount;
1708 break;
1709
1710 case MASK(RIGHT_FILLING):
1711 /*
1712 * Setting the last part of a previous oldext extent to newext.
1713 * The right neighbor is not contiguous.
1714 */
1715 XFS_BMAP_TRACE_PRE_UPDATE("RF", ip, idx, XFS_DATA_FORK);
1716 xfs_bmbt_set_blockcount(ep,
1717 PREV.br_blockcount - new->br_blockcount);
1718 XFS_BMAP_TRACE_POST_UPDATE("RF", ip, idx, XFS_DATA_FORK);
1719 XFS_BMAP_TRACE_INSERT("RF", ip, idx + 1, 1, new, NULL,
1720 XFS_DATA_FORK);
1721 xfs_iext_insert(ifp, idx + 1, 1, new);
1722 ip->i_df.if_lastex = idx + 1;
1723 ip->i_d.di_nextents++;
1724 if (cur == NULL)
1725 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1726 else {
1727 rval = XFS_ILOG_CORE;
1728 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1729 PREV.br_startblock, PREV.br_blockcount,
1730 &i)))
1731 goto done;
1732 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1733 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1734 PREV.br_startblock,
1735 PREV.br_blockcount - new->br_blockcount,
1736 oldext)))
1737 goto done;
1738 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1739 new->br_startblock, new->br_blockcount,
1740 &i)))
1741 goto done;
1742 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1743 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1744 if ((error = xfs_btree_insert(cur, &i)))
1745 goto done;
1746 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1747 }
1748 /* DELTA: One in-core extent is split in two. */
1749 temp = PREV.br_startoff;
1750 temp2 = PREV.br_blockcount;
1751 break;
1752
1753 case 0:
1754 /*
1755 * Setting the middle part of a previous oldext extent to
1756 * newext. Contiguity is impossible here.
1757 * One extent becomes three extents.
1758 */
1759 XFS_BMAP_TRACE_PRE_UPDATE("0", ip, idx, XFS_DATA_FORK);
1760 xfs_bmbt_set_blockcount(ep,
1761 new->br_startoff - PREV.br_startoff);
1762 XFS_BMAP_TRACE_POST_UPDATE("0", ip, idx, XFS_DATA_FORK);
1763 r[0] = *new;
1764 r[1].br_startoff = new_endoff;
1765 r[1].br_blockcount =
1766 PREV.br_startoff + PREV.br_blockcount - new_endoff;
1767 r[1].br_startblock = new->br_startblock + new->br_blockcount;
1768 r[1].br_state = oldext;
1769 XFS_BMAP_TRACE_INSERT("0", ip, idx + 1, 2, &r[0], &r[1],
1770 XFS_DATA_FORK);
1771 xfs_iext_insert(ifp, idx + 1, 2, &r[0]);
1772 ip->i_df.if_lastex = idx + 1;
1773 ip->i_d.di_nextents += 2;
1774 if (cur == NULL)
1775 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1776 else {
1777 rval = XFS_ILOG_CORE;
1778 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1779 PREV.br_startblock, PREV.br_blockcount,
1780 &i)))
1781 goto done;
1782 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1783 /* new right extent - oldext */
1784 if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
1785 r[1].br_startblock, r[1].br_blockcount,
1786 r[1].br_state)))
1787 goto done;
1788 /* new left extent - oldext */
1789 cur->bc_rec.b = PREV;
1790 cur->bc_rec.b.br_blockcount =
1791 new->br_startoff - PREV.br_startoff;
1792 if ((error = xfs_btree_insert(cur, &i)))
1793 goto done;
1794 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1795 /*
1796 * Reset the cursor to the position of the new extent
1797 * we are about to insert as we can't trust it after
1798 * the previous insert.
1799 */
1800 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1801 new->br_startblock, new->br_blockcount,
1802 &i)))
1803 goto done;
1804 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1805 /* new middle extent - newext */
1806 cur->bc_rec.b.br_state = new->br_state;
1807 if ((error = xfs_btree_insert(cur, &i)))
1808 goto done;
1809 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1810 }
1811 /* DELTA: One in-core extent is split in three. */
1812 temp = PREV.br_startoff;
1813 temp2 = PREV.br_blockcount;
1814 break;
1815
1816 case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1817 case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1818 case MASK2(LEFT_FILLING, RIGHT_CONTIG):
1819 case MASK2(RIGHT_FILLING, LEFT_CONTIG):
1820 case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
1821 case MASK(LEFT_CONTIG):
1822 case MASK(RIGHT_CONTIG):
1823 /*
1824 * These cases are all impossible.
1825 */
1826 ASSERT(0);
1827 }
1828 *curp = cur;
1829 if (delta) {
1830 temp2 += temp;
1831 if (delta->xed_startoff > temp)
1832 delta->xed_startoff = temp;
1833 if (delta->xed_blockcount < temp2)
1834 delta->xed_blockcount = temp2;
1835 }
1836 done:
1837 *logflagsp = rval;
1838 return error;
1839 #undef LEFT
1840 #undef RIGHT
1841 #undef PREV
1842 #undef MASK
1843 #undef MASK2
1844 #undef MASK3
1845 #undef MASK4
1846 #undef STATE_SET
1847 #undef STATE_TEST
1848 #undef STATE_SET_TEST
1849 #undef SWITCH_STATE
1850 }
1851
1852 /*
1853 * Called by xfs_bmap_add_extent to handle cases converting a hole
1854 * to a delayed allocation.
1855 */
1856 /*ARGSUSED*/
1857 STATIC int /* error */
1858 xfs_bmap_add_extent_hole_delay(
1859 xfs_inode_t *ip, /* incore inode pointer */
1860 xfs_extnum_t idx, /* extent number to update/insert */
1861 xfs_bmbt_irec_t *new, /* new data to add to file extents */
1862 int *logflagsp, /* inode logging flags */
1863 xfs_extdelta_t *delta, /* Change made to incore extents */
1864 int rsvd) /* OK to allocate reserved blocks */
1865 {
1866 xfs_bmbt_rec_host_t *ep; /* extent record for idx */
1867 xfs_ifork_t *ifp; /* inode fork pointer */
1868 xfs_bmbt_irec_t left; /* left neighbor extent entry */
1869 xfs_filblks_t newlen=0; /* new indirect size */
1870 xfs_filblks_t oldlen=0; /* old indirect size */
1871 xfs_bmbt_irec_t right; /* right neighbor extent entry */
1872 int state; /* state bits, accessed thru macros */
1873 xfs_filblks_t temp=0; /* temp for indirect calculations */
1874 xfs_filblks_t temp2=0;
1875 enum { /* bit number definitions for state */
1876 LEFT_CONTIG, RIGHT_CONTIG,
1877 LEFT_DELAY, RIGHT_DELAY,
1878 LEFT_VALID, RIGHT_VALID
1879 };
1880
1881 #define MASK(b) (1 << (b))
1882 #define MASK2(a,b) (MASK(a) | MASK(b))
1883 #define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
1884 #define STATE_TEST(b) (state & MASK(b))
1885 #define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
1886 ((state &= ~MASK(b)), 0))
1887 #define SWITCH_STATE (state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
1888
1889 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1890 ep = xfs_iext_get_ext(ifp, idx);
1891 state = 0;
1892 ASSERT(ISNULLSTARTBLOCK(new->br_startblock));
1893 /*
1894 * Check and set flags if this segment has a left neighbor
1895 */
1896 if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
1897 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &left);
1898 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
1899 }
1900 /*
1901 * Check and set flags if the current (right) segment exists.
1902 * If it doesn't exist, we're converting the hole at end-of-file.
1903 */
1904 if (STATE_SET_TEST(RIGHT_VALID,
1905 idx <
1906 ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
1907 xfs_bmbt_get_all(ep, &right);
1908 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
1909 }
1910 /*
1911 * Set contiguity flags on the left and right neighbors.
1912 * Don't let extents get too large, even if the pieces are contiguous.
1913 */
1914 STATE_SET(LEFT_CONTIG,
1915 STATE_TEST(LEFT_VALID) && STATE_TEST(LEFT_DELAY) &&
1916 left.br_startoff + left.br_blockcount == new->br_startoff &&
1917 left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
1918 STATE_SET(RIGHT_CONTIG,
1919 STATE_TEST(RIGHT_VALID) && STATE_TEST(RIGHT_DELAY) &&
1920 new->br_startoff + new->br_blockcount == right.br_startoff &&
1921 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
1922 (!STATE_TEST(LEFT_CONTIG) ||
1923 (left.br_blockcount + new->br_blockcount +
1924 right.br_blockcount <= MAXEXTLEN)));
1925 /*
1926 * Switch out based on the contiguity flags.
1927 */
1928 switch (SWITCH_STATE) {
1929
1930 case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
1931 /*
1932 * New allocation is contiguous with delayed allocations
1933 * on the left and on the right.
1934 * Merge all three into a single extent record.
1935 */
1936 temp = left.br_blockcount + new->br_blockcount +
1937 right.br_blockcount;
1938 XFS_BMAP_TRACE_PRE_UPDATE("LC|RC", ip, idx - 1,
1939 XFS_DATA_FORK);
1940 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1), temp);
1941 oldlen = STARTBLOCKVAL(left.br_startblock) +
1942 STARTBLOCKVAL(new->br_startblock) +
1943 STARTBLOCKVAL(right.br_startblock);
1944 newlen = xfs_bmap_worst_indlen(ip, temp);
1945 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, idx - 1),
1946 NULLSTARTBLOCK((int)newlen));
1947 XFS_BMAP_TRACE_POST_UPDATE("LC|RC", ip, idx - 1,
1948 XFS_DATA_FORK);
1949 XFS_BMAP_TRACE_DELETE("LC|RC", ip, idx, 1, XFS_DATA_FORK);
1950 xfs_iext_remove(ifp, idx, 1);
1951 ip->i_df.if_lastex = idx - 1;
1952 /* DELTA: Two in-core extents were replaced by one. */
1953 temp2 = temp;
1954 temp = left.br_startoff;
1955 break;
1956
1957 case MASK(LEFT_CONTIG):
1958 /*
1959 * New allocation is contiguous with a delayed allocation
1960 * on the left.
1961 * Merge the new allocation with the left neighbor.
1962 */
1963 temp = left.br_blockcount + new->br_blockcount;
1964 XFS_BMAP_TRACE_PRE_UPDATE("LC", ip, idx - 1,
1965 XFS_DATA_FORK);
1966 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1), temp);
1967 oldlen = STARTBLOCKVAL(left.br_startblock) +
1968 STARTBLOCKVAL(new->br_startblock);
1969 newlen = xfs_bmap_worst_indlen(ip, temp);
1970 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, idx - 1),
1971 NULLSTARTBLOCK((int)newlen));
1972 XFS_BMAP_TRACE_POST_UPDATE("LC", ip, idx - 1,
1973 XFS_DATA_FORK);
1974 ip->i_df.if_lastex = idx - 1;
1975 /* DELTA: One in-core extent grew into a hole. */
1976 temp2 = temp;
1977 temp = left.br_startoff;
1978 break;
1979
1980 case MASK(RIGHT_CONTIG):
1981 /*
1982 * New allocation is contiguous with a delayed allocation
1983 * on the right.
1984 * Merge the new allocation with the right neighbor.
1985 */
1986 XFS_BMAP_TRACE_PRE_UPDATE("RC", ip, idx, XFS_DATA_FORK);
1987 temp = new->br_blockcount + right.br_blockcount;
1988 oldlen = STARTBLOCKVAL(new->br_startblock) +
1989 STARTBLOCKVAL(right.br_startblock);
1990 newlen = xfs_bmap_worst_indlen(ip, temp);
1991 xfs_bmbt_set_allf(ep, new->br_startoff,
1992 NULLSTARTBLOCK((int)newlen), temp, right.br_state);
1993 XFS_BMAP_TRACE_POST_UPDATE("RC", ip, idx, XFS_DATA_FORK);
1994 ip->i_df.if_lastex = idx;
1995 /* DELTA: One in-core extent grew into a hole. */
1996 temp2 = temp;
1997 temp = new->br_startoff;
1998 break;
1999
2000 case 0:
2001 /*
2002 * New allocation is not contiguous with another
2003 * delayed allocation.
2004 * Insert a new entry.
2005 */
2006 oldlen = newlen = 0;
2007 XFS_BMAP_TRACE_INSERT("0", ip, idx, 1, new, NULL,
2008 XFS_DATA_FORK);
2009 xfs_iext_insert(ifp, idx, 1, new);
2010 ip->i_df.if_lastex = idx;
2011 /* DELTA: A new in-core extent was added in a hole. */
2012 temp2 = new->br_blockcount;
2013 temp = new->br_startoff;
2014 break;
2015 }
2016 if (oldlen != newlen) {
2017 ASSERT(oldlen > newlen);
2018 xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
2019 (int64_t)(oldlen - newlen), rsvd);
2020 /*
2021 * Nothing to do for disk quota accounting here.
2022 */
2023 }
2024 if (delta) {
2025 temp2 += temp;
2026 if (delta->xed_startoff > temp)
2027 delta->xed_startoff = temp;
2028 if (delta->xed_blockcount < temp2)
2029 delta->xed_blockcount = temp2;
2030 }
2031 *logflagsp = 0;
2032 return 0;
2033 #undef MASK
2034 #undef MASK2
2035 #undef STATE_SET
2036 #undef STATE_TEST
2037 #undef STATE_SET_TEST
2038 #undef SWITCH_STATE
2039 }
2040
2041 /*
2042 * Called by xfs_bmap_add_extent to handle cases converting a hole
2043 * to a real allocation.
2044 */
2045 STATIC int /* error */
2046 xfs_bmap_add_extent_hole_real(
2047 xfs_inode_t *ip, /* incore inode pointer */
2048 xfs_extnum_t idx, /* extent number to update/insert */
2049 xfs_btree_cur_t *cur, /* if null, not a btree */
2050 xfs_bmbt_irec_t *new, /* new data to add to file extents */
2051 int *logflagsp, /* inode logging flags */
2052 xfs_extdelta_t *delta, /* Change made to incore extents */
2053 int whichfork) /* data or attr fork */
2054 {
2055 xfs_bmbt_rec_host_t *ep; /* pointer to extent entry ins. point */
2056 int error; /* error return value */
2057 int i; /* temp state */
2058 xfs_ifork_t *ifp; /* inode fork pointer */
2059 xfs_bmbt_irec_t left; /* left neighbor extent entry */
2060 xfs_bmbt_irec_t right; /* right neighbor extent entry */
2061 int rval=0; /* return value (logging flags) */
2062 int state; /* state bits, accessed thru macros */
2063 xfs_filblks_t temp=0;
2064 xfs_filblks_t temp2=0;
2065 enum { /* bit number definitions for state */
2066 LEFT_CONTIG, RIGHT_CONTIG,
2067 LEFT_DELAY, RIGHT_DELAY,
2068 LEFT_VALID, RIGHT_VALID
2069 };
2070
2071 #define MASK(b) (1 << (b))
2072 #define MASK2(a,b) (MASK(a) | MASK(b))
2073 #define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
2074 #define STATE_TEST(b) (state & MASK(b))
2075 #define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
2076 ((state &= ~MASK(b)), 0))
2077 #define SWITCH_STATE (state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
2078
2079 ifp = XFS_IFORK_PTR(ip, whichfork);
2080 ASSERT(idx <= ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
2081 ep = xfs_iext_get_ext(ifp, idx);
2082 state = 0;
2083 /*
2084 * Check and set flags if this segment has a left neighbor.
2085 */
2086 if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
2087 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &left);
2088 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
2089 }
2090 /*
2091 * Check and set flags if this segment has a current value.
2092 * Not true if we're inserting into the "hole" at eof.
2093 */
2094 if (STATE_SET_TEST(RIGHT_VALID,
2095 idx <
2096 ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
2097 xfs_bmbt_get_all(ep, &right);
2098 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
2099 }
2100 /*
2101 * We're inserting a real allocation between "left" and "right".
2102 * Set the contiguity flags. Don't let extents get too large.
2103 */
2104 STATE_SET(LEFT_CONTIG,
2105 STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
2106 left.br_startoff + left.br_blockcount == new->br_startoff &&
2107 left.br_startblock + left.br_blockcount == new->br_startblock &&
2108 left.br_state == new->br_state &&
2109 left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
2110 STATE_SET(RIGHT_CONTIG,
2111 STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
2112 new->br_startoff + new->br_blockcount == right.br_startoff &&
2113 new->br_startblock + new->br_blockcount ==
2114 right.br_startblock &&
2115 new->br_state == right.br_state &&
2116 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
2117 (!STATE_TEST(LEFT_CONTIG) ||
2118 left.br_blockcount + new->br_blockcount +
2119 right.br_blockcount <= MAXEXTLEN));
2120
2121 error = 0;
2122 /*
2123 * Select which case we're in here, and implement it.
2124 */
2125 switch (SWITCH_STATE) {
2126
2127 case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
2128 /*
2129 * New allocation is contiguous with real allocations on the
2130 * left and on the right.
2131 * Merge all three into a single extent record.
2132 */
2133 XFS_BMAP_TRACE_PRE_UPDATE("LC|RC", ip, idx - 1,
2134 whichfork);
2135 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
2136 left.br_blockcount + new->br_blockcount +
2137 right.br_blockcount);
2138 XFS_BMAP_TRACE_POST_UPDATE("LC|RC", ip, idx - 1,
2139 whichfork);
2140 XFS_BMAP_TRACE_DELETE("LC|RC", ip, idx, 1, whichfork);
2141 xfs_iext_remove(ifp, idx, 1);
2142 ifp->if_lastex = idx - 1;
2143 XFS_IFORK_NEXT_SET(ip, whichfork,
2144 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
2145 if (cur == NULL) {
2146 rval = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
2147 } else {
2148 rval = XFS_ILOG_CORE;
2149 if ((error = xfs_bmbt_lookup_eq(cur,
2150 right.br_startoff,
2151 right.br_startblock,
2152 right.br_blockcount, &i)))
2153 goto done;
2154 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2155 if ((error = xfs_btree_delete(cur, &i)))
2156 goto done;
2157 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2158 if ((error = xfs_btree_decrement(cur, 0, &i)))
2159 goto done;
2160 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2161 if ((error = xfs_bmbt_update(cur, left.br_startoff,
2162 left.br_startblock,
2163 left.br_blockcount +
2164 new->br_blockcount +
2165 right.br_blockcount,
2166 left.br_state)))
2167 goto done;
2168 }
2169 /* DELTA: Two in-core extents were replaced by one. */
2170 temp = left.br_startoff;
2171 temp2 = left.br_blockcount +
2172 new->br_blockcount +
2173 right.br_blockcount;
2174 break;
2175
2176 case MASK(LEFT_CONTIG):
2177 /*
2178 * New allocation is contiguous with a real allocation
2179 * on the left.
2180 * Merge the new allocation with the left neighbor.
2181 */
2182 XFS_BMAP_TRACE_PRE_UPDATE("LC", ip, idx - 1, whichfork);
2183 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
2184 left.br_blockcount + new->br_blockcount);
2185 XFS_BMAP_TRACE_POST_UPDATE("LC", ip, idx - 1, whichfork);
2186 ifp->if_lastex = idx - 1;
2187 if (cur == NULL) {
2188 rval = XFS_ILOG_FEXT(whichfork);
2189 } else {
2190 rval = 0;
2191 if ((error = xfs_bmbt_lookup_eq(cur,
2192 left.br_startoff,
2193 left.br_startblock,
2194 left.br_blockcount, &i)))
2195 goto done;
2196 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2197 if ((error = xfs_bmbt_update(cur, left.br_startoff,
2198 left.br_startblock,
2199 left.br_blockcount +
2200 new->br_blockcount,
2201 left.br_state)))
2202 goto done;
2203 }
2204 /* DELTA: One in-core extent grew. */
2205 temp = left.br_startoff;
2206 temp2 = left.br_blockcount +
2207 new->br_blockcount;
2208 break;
2209
2210 case MASK(RIGHT_CONTIG):
2211 /*
2212 * New allocation is contiguous with a real allocation
2213 * on the right.
2214 * Merge the new allocation with the right neighbor.
2215 */
2216 XFS_BMAP_TRACE_PRE_UPDATE("RC", ip, idx, whichfork);
2217 xfs_bmbt_set_allf(ep, new->br_startoff, new->br_startblock,
2218 new->br_blockcount + right.br_blockcount,
2219 right.br_state);
2220 XFS_BMAP_TRACE_POST_UPDATE("RC", ip, idx, whichfork);
2221 ifp->if_lastex = idx;
2222 if (cur == NULL) {
2223 rval = XFS_ILOG_FEXT(whichfork);
2224 } else {
2225 rval = 0;
2226 if ((error = xfs_bmbt_lookup_eq(cur,
2227 right.br_startoff,
2228 right.br_startblock,
2229 right.br_blockcount, &i)))
2230 goto done;
2231 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2232 if ((error = xfs_bmbt_update(cur, new->br_startoff,
2233 new->br_startblock,
2234 new->br_blockcount +
2235 right.br_blockcount,
2236 right.br_state)))
2237 goto done;
2238 }
2239 /* DELTA: One in-core extent grew. */
2240 temp = new->br_startoff;
2241 temp2 = new->br_blockcount +
2242 right.br_blockcount;
2243 break;
2244
2245 case 0:
2246 /*
2247 * New allocation is not contiguous with another
2248 * real allocation.
2249 * Insert a new entry.
2250 */
2251 XFS_BMAP_TRACE_INSERT("0", ip, idx, 1, new, NULL, whichfork);
2252 xfs_iext_insert(ifp, idx, 1, new);
2253 ifp->if_lastex = idx;
2254 XFS_IFORK_NEXT_SET(ip, whichfork,
2255 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
2256 if (cur == NULL) {
2257 rval = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
2258 } else {
2259 rval = XFS_ILOG_CORE;
2260 if ((error = xfs_bmbt_lookup_eq(cur,
2261 new->br_startoff,
2262 new->br_startblock,
2263 new->br_blockcount, &i)))
2264 goto done;
2265 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
2266 cur->bc_rec.b.br_state = new->br_state;
2267 if ((error = xfs_btree_insert(cur, &i)))
2268 goto done;
2269 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2270 }
2271 /* DELTA: A new extent was added in a hole. */
2272 temp = new->br_startoff;
2273 temp2 = new->br_blockcount;
2274 break;
2275 }
2276 if (delta) {
2277 temp2 += temp;
2278 if (delta->xed_startoff > temp)
2279 delta->xed_startoff = temp;
2280 if (delta->xed_blockcount < temp2)
2281 delta->xed_blockcount = temp2;
2282 }
2283 done:
2284 *logflagsp = rval;
2285 return error;
2286 #undef MASK
2287 #undef MASK2
2288 #undef STATE_SET
2289 #undef STATE_TEST
2290 #undef STATE_SET_TEST
2291 #undef SWITCH_STATE
2292 }
2293
2294 /*
2295 * Adjust the size of the new extent based on di_extsize and rt extsize.
2296 */
2297 STATIC int
2298 xfs_bmap_extsize_align(
2299 xfs_mount_t *mp,
2300 xfs_bmbt_irec_t *gotp, /* next extent pointer */
2301 xfs_bmbt_irec_t *prevp, /* previous extent pointer */
2302 xfs_extlen_t extsz, /* align to this extent size */
2303 int rt, /* is this a realtime inode? */
2304 int eof, /* is extent at end-of-file? */
2305 int delay, /* creating delalloc extent? */
2306 int convert, /* overwriting unwritten extent? */
2307 xfs_fileoff_t *offp, /* in/out: aligned offset */
2308 xfs_extlen_t *lenp) /* in/out: aligned length */
2309 {
2310 xfs_fileoff_t orig_off; /* original offset */
2311 xfs_extlen_t orig_alen; /* original length */
2312 xfs_fileoff_t orig_end; /* original off+len */
2313 xfs_fileoff_t nexto; /* next file offset */
2314 xfs_fileoff_t prevo; /* previous file offset */
2315 xfs_fileoff_t align_off; /* temp for offset */
2316 xfs_extlen_t align_alen; /* temp for length */
2317 xfs_extlen_t temp; /* temp for calculations */
2318
2319 if (convert)
2320 return 0;
2321
2322 orig_off = align_off = *offp;
2323 orig_alen = align_alen = *lenp;
2324 orig_end = orig_off + orig_alen;
2325
2326 /*
2327 * If this request overlaps an existing extent, then don't
2328 * attempt to perform any additional alignment.
2329 */
2330 if (!delay && !eof &&
2331 (orig_off >= gotp->br_startoff) &&
2332 (orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
2333 return 0;
2334 }
2335
2336 /*
2337 * If the file offset is unaligned vs. the extent size
2338 * we need to align it. This will be possible unless
2339 * the file was previously written with a kernel that didn't
2340 * perform this alignment, or if a truncate shot us in the
2341 * foot.
2342 */
2343 temp = do_mod(orig_off, extsz);
2344 if (temp) {
2345 align_alen += temp;
2346 align_off -= temp;
2347 }
2348 /*
2349 * Same adjustment for the end of the requested area.
2350 */
2351 if ((temp = (align_alen % extsz))) {
2352 align_alen += extsz - temp;
2353 }
2354 /*
2355 * If the previous block overlaps with this proposed allocation
2356 * then move the start forward without adjusting the length.
2357 */
2358 if (prevp->br_startoff != NULLFILEOFF) {
2359 if (prevp->br_startblock == HOLESTARTBLOCK)
2360 prevo = prevp->br_startoff;
2361 else
2362 prevo = prevp->br_startoff + prevp->br_blockcount;
2363 } else
2364 prevo = 0;
2365 if (align_off != orig_off && align_off < prevo)
2366 align_off = prevo;
2367 /*
2368 * If the next block overlaps with this proposed allocation
2369 * then move the start back without adjusting the length,
2370 * but not before offset 0.
2371 * This may of course make the start overlap previous block,
2372 * and if we hit the offset 0 limit then the next block
2373 * can still overlap too.
2374 */
2375 if (!eof && gotp->br_startoff != NULLFILEOFF) {
2376 if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
2377 (!delay && gotp->br_startblock == DELAYSTARTBLOCK))
2378 nexto = gotp->br_startoff + gotp->br_blockcount;
2379 else
2380 nexto = gotp->br_startoff;
2381 } else
2382 nexto = NULLFILEOFF;
2383 if (!eof &&
2384 align_off + align_alen != orig_end &&
2385 align_off + align_alen > nexto)
2386 align_off = nexto > align_alen ? nexto - align_alen : 0;
2387 /*
2388 * If we're now overlapping the next or previous extent that
2389 * means we can't fit an extsz piece in this hole. Just move
2390 * the start forward to the first valid spot and set
2391 * the length so we hit the end.
2392 */
2393 if (align_off != orig_off && align_off < prevo)
2394 align_off = prevo;
2395 if (align_off + align_alen != orig_end &&
2396 align_off + align_alen > nexto &&
2397 nexto != NULLFILEOFF) {
2398 ASSERT(nexto > prevo);
2399 align_alen = nexto - align_off;
2400 }
2401
2402 /*
2403 * If realtime, and the result isn't a multiple of the realtime
2404 * extent size we need to remove blocks until it is.
2405 */
2406 if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
2407 /*
2408 * We're not covering the original request, or
2409 * we won't be able to once we fix the length.
2410 */
2411 if (orig_off < align_off ||
2412 orig_end > align_off + align_alen ||
2413 align_alen - temp < orig_alen)
2414 return XFS_ERROR(EINVAL);
2415 /*
2416 * Try to fix it by moving the start up.
2417 */
2418 if (align_off + temp <= orig_off) {
2419 align_alen -= temp;
2420 align_off += temp;
2421 }
2422 /*
2423 * Try to fix it by moving the end in.
2424 */
2425 else if (align_off + align_alen - temp >= orig_end)
2426 align_alen -= temp;
2427 /*
2428 * Set the start to the minimum then trim the length.
2429 */
2430 else {
2431 align_alen -= orig_off - align_off;
2432 align_off = orig_off;
2433 align_alen -= align_alen % mp->m_sb.sb_rextsize;
2434 }
2435 /*
2436 * Result doesn't cover the request, fail it.
2437 */
2438 if (orig_off < align_off || orig_end > align_off + align_alen)
2439 return XFS_ERROR(EINVAL);
2440 } else {
2441 ASSERT(orig_off >= align_off);
2442 ASSERT(orig_end <= align_off + align_alen);
2443 }
2444
2445 #ifdef DEBUG
2446 if (!eof && gotp->br_startoff != NULLFILEOFF)
2447 ASSERT(align_off + align_alen <= gotp->br_startoff);
2448 if (prevp->br_startoff != NULLFILEOFF)
2449 ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
2450 #endif
2451
2452 *lenp = align_alen;
2453 *offp = align_off;
2454 return 0;
2455 }
2456
2457 #define XFS_ALLOC_GAP_UNITS 4
2458
2459 STATIC void
2460 xfs_bmap_adjacent(
2461 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2462 {
2463 xfs_fsblock_t adjust; /* adjustment to block numbers */
2464 xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
2465 xfs_mount_t *mp; /* mount point structure */
2466 int nullfb; /* true if ap->firstblock isn't set */
2467 int rt; /* true if inode is realtime */
2468
2469 #define ISVALID(x,y) \
2470 (rt ? \
2471 (x) < mp->m_sb.sb_rblocks : \
2472 XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
2473 XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
2474 XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
2475
2476 mp = ap->ip->i_mount;
2477 nullfb = ap->firstblock == NULLFSBLOCK;
2478 rt = XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata;
2479 fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
2480 /*
2481 * If allocating at eof, and there's a previous real block,
2482 * try to use it's last block as our starting point.
2483 */
2484 if (ap->eof && ap->prevp->br_startoff != NULLFILEOFF &&
2485 !ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
2486 ISVALID(ap->prevp->br_startblock + ap->prevp->br_blockcount,
2487 ap->prevp->br_startblock)) {
2488 ap->rval = ap->prevp->br_startblock + ap->prevp->br_blockcount;
2489 /*
2490 * Adjust for the gap between prevp and us.
2491 */
2492 adjust = ap->off -
2493 (ap->prevp->br_startoff + ap->prevp->br_blockcount);
2494 if (adjust &&
2495 ISVALID(ap->rval + adjust, ap->prevp->br_startblock))
2496 ap->rval += adjust;
2497 }
2498 /*
2499 * If not at eof, then compare the two neighbor blocks.
2500 * Figure out whether either one gives us a good starting point,
2501 * and pick the better one.
2502 */
2503 else if (!ap->eof) {
2504 xfs_fsblock_t gotbno; /* right side block number */
2505 xfs_fsblock_t gotdiff=0; /* right side difference */
2506 xfs_fsblock_t prevbno; /* left side block number */
2507 xfs_fsblock_t prevdiff=0; /* left side difference */
2508
2509 /*
2510 * If there's a previous (left) block, select a requested
2511 * start block based on it.
2512 */
2513 if (ap->prevp->br_startoff != NULLFILEOFF &&
2514 !ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
2515 (prevbno = ap->prevp->br_startblock +
2516 ap->prevp->br_blockcount) &&
2517 ISVALID(prevbno, ap->prevp->br_startblock)) {
2518 /*
2519 * Calculate gap to end of previous block.
2520 */
2521 adjust = prevdiff = ap->off -
2522 (ap->prevp->br_startoff +
2523 ap->prevp->br_blockcount);
2524 /*
2525 * Figure the startblock based on the previous block's
2526 * end and the gap size.
2527 * Heuristic!
2528 * If the gap is large relative to the piece we're
2529 * allocating, or using it gives us an invalid block
2530 * number, then just use the end of the previous block.
2531 */
2532 if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
2533 ISVALID(prevbno + prevdiff,
2534 ap->prevp->br_startblock))
2535 prevbno += adjust;
2536 else
2537 prevdiff += adjust;
2538 /*
2539 * If the firstblock forbids it, can't use it,
2540 * must use default.
2541 */
2542 if (!rt && !nullfb &&
2543 XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
2544 prevbno = NULLFSBLOCK;
2545 }
2546 /*
2547 * No previous block or can't follow it, just default.
2548 */
2549 else
2550 prevbno = NULLFSBLOCK;
2551 /*
2552 * If there's a following (right) block, select a requested
2553 * start block based on it.
2554 */
2555 if (!ISNULLSTARTBLOCK(ap->gotp->br_startblock)) {
2556 /*
2557 * Calculate gap to start of next block.
2558 */
2559 adjust = gotdiff = ap->gotp->br_startoff - ap->off;
2560 /*
2561 * Figure the startblock based on the next block's
2562 * start and the gap size.
2563 */
2564 gotbno = ap->gotp->br_startblock;
2565 /*
2566 * Heuristic!
2567 * If the gap is large relative to the piece we're
2568 * allocating, or using it gives us an invalid block
2569 * number, then just use the start of the next block
2570 * offset by our length.
2571 */
2572 if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
2573 ISVALID(gotbno - gotdiff, gotbno))
2574 gotbno -= adjust;
2575 else if (ISVALID(gotbno - ap->alen, gotbno)) {
2576 gotbno -= ap->alen;
2577 gotdiff += adjust - ap->alen;
2578 } else
2579 gotdiff += adjust;
2580 /*
2581 * If the firstblock forbids it, can't use it,
2582 * must use default.
2583 */
2584 if (!rt && !nullfb &&
2585 XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
2586 gotbno = NULLFSBLOCK;
2587 }
2588 /*
2589 * No next block, just default.
2590 */
2591 else
2592 gotbno = NULLFSBLOCK;
2593 /*
2594 * If both valid, pick the better one, else the only good
2595 * one, else ap->rval is already set (to 0 or the inode block).
2596 */
2597 if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
2598 ap->rval = prevdiff <= gotdiff ? prevbno : gotbno;
2599 else if (prevbno != NULLFSBLOCK)
2600 ap->rval = prevbno;
2601 else if (gotbno != NULLFSBLOCK)
2602 ap->rval = gotbno;
2603 }
2604 #undef ISVALID
2605 }
2606
2607 STATIC int
2608 xfs_bmap_rtalloc(
2609 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2610 {
2611 xfs_alloctype_t atype = 0; /* type for allocation routines */
2612 int error; /* error return value */
2613 xfs_mount_t *mp; /* mount point structure */
2614 xfs_extlen_t prod = 0; /* product factor for allocators */
2615 xfs_extlen_t ralen = 0; /* realtime allocation length */
2616 xfs_extlen_t align; /* minimum allocation alignment */
2617 xfs_rtblock_t rtb;
2618
2619 mp = ap->ip->i_mount;
2620 align = xfs_get_extsz_hint(ap->ip);
2621 prod = align / mp->m_sb.sb_rextsize;
2622 error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
2623 align, 1, ap->eof, 0,
2624 ap->conv, &ap->off, &ap->alen);
2625 if (error)
2626 return error;
2627 ASSERT(ap->alen);
2628 ASSERT(ap->alen % mp->m_sb.sb_rextsize == 0);
2629
2630 /*
2631 * If the offset & length are not perfectly aligned
2632 * then kill prod, it will just get us in trouble.
2633 */
2634 if (do_mod(ap->off, align) || ap->alen % align)
2635 prod = 1;
2636 /*
2637 * Set ralen to be the actual requested length in rtextents.
2638 */
2639 ralen = ap->alen / mp->m_sb.sb_rextsize;
2640 /*
2641 * If the old value was close enough to MAXEXTLEN that
2642 * we rounded up to it, cut it back so it's valid again.
2643 * Note that if it's a really large request (bigger than
2644 * MAXEXTLEN), we don't hear about that number, and can't
2645 * adjust the starting point to match it.
2646 */
2647 if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
2648 ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
2649 /*
2650 * If it's an allocation to an empty file at offset 0,
2651 * pick an extent that will space things out in the rt area.
2652 */
2653 if (ap->eof && ap->off == 0) {
2654 xfs_rtblock_t uninitialized_var(rtx); /* realtime extent no */
2655
2656 error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
2657 if (error)
2658 return error;
2659 ap->rval = rtx * mp->m_sb.sb_rextsize;
2660 } else {
2661 ap->rval = 0;
2662 }
2663
2664 xfs_bmap_adjacent(ap);
2665
2666 /*
2667 * Realtime allocation, done through xfs_rtallocate_extent.
2668 */
2669 atype = ap->rval == 0 ? XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
2670 do_div(ap->rval, mp->m_sb.sb_rextsize);
2671 rtb = ap->rval;
2672 ap->alen = ralen;
2673 if ((error = xfs_rtallocate_extent(ap->tp, ap->rval, 1, ap->alen,
2674 &ralen, atype, ap->wasdel, prod, &rtb)))
2675 return error;
2676 if (rtb == NULLFSBLOCK && prod > 1 &&
2677 (error = xfs_rtallocate_extent(ap->tp, ap->rval, 1,
2678 ap->alen, &ralen, atype,
2679 ap->wasdel, 1, &rtb)))
2680 return error;
2681 ap->rval = rtb;
2682 if (ap->rval != NULLFSBLOCK) {
2683 ap->rval *= mp->m_sb.sb_rextsize;
2684 ralen *= mp->m_sb.sb_rextsize;
2685 ap->alen = ralen;
2686 ap->ip->i_d.di_nblocks += ralen;
2687 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2688 if (ap->wasdel)
2689 ap->ip->i_delayed_blks -= ralen;
2690 /*
2691 * Adjust the disk quota also. This was reserved
2692 * earlier.
2693 */
2694 XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
2695 ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
2696 XFS_TRANS_DQ_RTBCOUNT, (long) ralen);
2697 } else {
2698 ap->alen = 0;
2699 }
2700 return 0;
2701 }
2702
2703 STATIC int
2704 xfs_bmap_btalloc(
2705 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2706 {
2707 xfs_mount_t *mp; /* mount point structure */
2708 xfs_alloctype_t atype = 0; /* type for allocation routines */
2709 xfs_extlen_t align; /* minimum allocation alignment */
2710 xfs_agnumber_t ag;
2711 xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
2712 xfs_agnumber_t startag;
2713 xfs_alloc_arg_t args;
2714 xfs_extlen_t blen;
2715 xfs_extlen_t delta;
2716 xfs_extlen_t longest;
2717 xfs_extlen_t need;
2718 xfs_extlen_t nextminlen = 0;
2719 xfs_perag_t *pag;
2720 int nullfb; /* true if ap->firstblock isn't set */
2721 int isaligned;
2722 int notinit;
2723 int tryagain;
2724 int error;
2725
2726 mp = ap->ip->i_mount;
2727 align = ap->userdata ? xfs_get_extsz_hint(ap->ip) : 0;
2728 if (unlikely(align)) {
2729 error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
2730 align, 0, ap->eof, 0, ap->conv,
2731 &ap->off, &ap->alen);
2732 ASSERT(!error);
2733 ASSERT(ap->alen);
2734 }
2735 nullfb = ap->firstblock == NULLFSBLOCK;
2736 fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
2737 if (nullfb) {
2738 if (ap->userdata && xfs_inode_is_filestream(ap->ip)) {
2739 ag = xfs_filestream_lookup_ag(ap->ip);
2740 ag = (ag != NULLAGNUMBER) ? ag : 0;
2741 ap->rval = XFS_AGB_TO_FSB(mp, ag, 0);
2742 } else {
2743 ap->rval = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
2744 }
2745 } else
2746 ap->rval = ap->firstblock;
2747
2748 xfs_bmap_adjacent(ap);
2749
2750 /*
2751 * If allowed, use ap->rval; otherwise must use firstblock since
2752 * it's in the right allocation group.
2753 */
2754 if (nullfb || XFS_FSB_TO_AGNO(mp, ap->rval) == fb_agno)
2755 ;
2756 else
2757 ap->rval = ap->firstblock;
2758 /*
2759 * Normal allocation, done through xfs_alloc_vextent.
2760 */
2761 tryagain = isaligned = 0;
2762 args.tp = ap->tp;
2763 args.mp = mp;
2764 args.fsbno = ap->rval;
2765 args.maxlen = MIN(ap->alen, mp->m_sb.sb_agblocks);
2766 args.firstblock = ap->firstblock;
2767 blen = 0;
2768 if (nullfb) {
2769 if (ap->userdata && xfs_inode_is_filestream(ap->ip))
2770 args.type = XFS_ALLOCTYPE_NEAR_BNO;
2771 else
2772 args.type = XFS_ALLOCTYPE_START_BNO;
2773 args.total = ap->total;
2774
2775 /*
2776 * Search for an allocation group with a single extent
2777 * large enough for the request.
2778 *
2779 * If one isn't found, then adjust the minimum allocation
2780 * size to the largest space found.
2781 */
2782 startag = ag = XFS_FSB_TO_AGNO(mp, args.fsbno);
2783 if (startag == NULLAGNUMBER)
2784 startag = ag = 0;
2785 notinit = 0;
2786 down_read(&mp->m_peraglock);
2787 while (blen < ap->alen) {
2788 pag = &mp->m_perag[ag];
2789 if (!pag->pagf_init &&
2790 (error = xfs_alloc_pagf_init(mp, args.tp,
2791 ag, XFS_ALLOC_FLAG_TRYLOCK))) {
2792 up_read(&mp->m_peraglock);
2793 return error;
2794 }
2795 /*
2796 * See xfs_alloc_fix_freelist...
2797 */
2798 if (pag->pagf_init) {
2799 need = XFS_MIN_FREELIST_PAG(pag, mp);
2800 delta = need > pag->pagf_flcount ?
2801 need - pag->pagf_flcount : 0;
2802 longest = (pag->pagf_longest > delta) ?
2803 (pag->pagf_longest - delta) :
2804 (pag->pagf_flcount > 0 ||
2805 pag->pagf_longest > 0);
2806 if (blen < longest)
2807 blen = longest;
2808 } else
2809 notinit = 1;
2810
2811 if (xfs_inode_is_filestream(ap->ip)) {
2812 if (blen >= ap->alen)
2813 break;
2814
2815 if (ap->userdata) {
2816 /*
2817 * If startag is an invalid AG, we've
2818 * come here once before and
2819 * xfs_filestream_new_ag picked the
2820 * best currently available.
2821 *
2822 * Don't continue looping, since we
2823 * could loop forever.
2824 */
2825 if (startag == NULLAGNUMBER)
2826 break;
2827
2828 error = xfs_filestream_new_ag(ap, &ag);
2829 if (error) {
2830 up_read(&mp->m_peraglock);
2831 return error;
2832 }
2833
2834 /* loop again to set 'blen'*/
2835 startag = NULLAGNUMBER;
2836 continue;
2837 }
2838 }
2839 if (++ag == mp->m_sb.sb_agcount)
2840 ag = 0;
2841 if (ag == startag)
2842 break;
2843 }
2844 up_read(&mp->m_peraglock);
2845 /*
2846 * Since the above loop did a BUF_TRYLOCK, it is
2847 * possible that there is space for this request.
2848 */
2849 if (notinit || blen < ap->minlen)
2850 args.minlen = ap->minlen;
2851 /*
2852 * If the best seen length is less than the request
2853 * length, use the best as the minimum.
2854 */
2855 else if (blen < ap->alen)
2856 args.minlen = blen;
2857 /*
2858 * Otherwise we've seen an extent as big as alen,
2859 * use that as the minimum.
2860 */
2861 else
2862 args.minlen = ap->alen;
2863
2864 /*
2865 * set the failure fallback case to look in the selected
2866 * AG as the stream may have moved.
2867 */
2868 if (xfs_inode_is_filestream(ap->ip))
2869 ap->rval = args.fsbno = XFS_AGB_TO_FSB(mp, ag, 0);
2870 } else if (ap->low) {
2871 if (xfs_inode_is_filestream(ap->ip))
2872 args.type = XFS_ALLOCTYPE_FIRST_AG;
2873 else
2874 args.type = XFS_ALLOCTYPE_START_BNO;
2875 args.total = args.minlen = ap->minlen;
2876 } else {
2877 args.type = XFS_ALLOCTYPE_NEAR_BNO;
2878 args.total = ap->total;
2879 args.minlen = ap->minlen;
2880 }
2881 /* apply extent size hints if obtained earlier */
2882 if (unlikely(align)) {
2883 args.prod = align;
2884 if ((args.mod = (xfs_extlen_t)do_mod(ap->off, args.prod)))
2885 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2886 } else if (mp->m_sb.sb_blocksize >= PAGE_CACHE_SIZE) {
2887 args.prod = 1;
2888 args.mod = 0;
2889 } else {
2890 args.prod = PAGE_CACHE_SIZE >> mp->m_sb.sb_blocklog;
2891 if ((args.mod = (xfs_extlen_t)(do_mod(ap->off, args.prod))))
2892 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2893 }
2894 /*
2895 * If we are not low on available data blocks, and the
2896 * underlying logical volume manager is a stripe, and
2897 * the file offset is zero then try to allocate data
2898 * blocks on stripe unit boundary.
2899 * NOTE: ap->aeof is only set if the allocation length
2900 * is >= the stripe unit and the allocation offset is
2901 * at the end of file.
2902 */
2903 if (!ap->low && ap->aeof) {
2904 if (!ap->off) {
2905 args.alignment = mp->m_dalign;
2906 atype = args.type;
2907 isaligned = 1;
2908 /*
2909 * Adjust for alignment
2910 */
2911 if (blen > args.alignment && blen <= ap->alen)
2912 args.minlen = blen - args.alignment;
2913 args.minalignslop = 0;
2914 } else {
2915 /*
2916 * First try an exact bno allocation.
2917 * If it fails then do a near or start bno
2918 * allocation with alignment turned on.
2919 */
2920 atype = args.type;
2921 tryagain = 1;
2922 args.type = XFS_ALLOCTYPE_THIS_BNO;
2923 args.alignment = 1;
2924 /*
2925 * Compute the minlen+alignment for the
2926 * next case. Set slop so that the value
2927 * of minlen+alignment+slop doesn't go up
2928 * between the calls.
2929 */
2930 if (blen > mp->m_dalign && blen <= ap->alen)
2931 nextminlen = blen - mp->m_dalign;
2932 else
2933 nextminlen = args.minlen;
2934 if (nextminlen + mp->m_dalign > args.minlen + 1)
2935 args.minalignslop =
2936 nextminlen + mp->m_dalign -
2937 args.minlen - 1;
2938 else
2939 args.minalignslop = 0;
2940 }
2941 } else {
2942 args.alignment = 1;
2943 args.minalignslop = 0;
2944 }
2945 args.minleft = ap->minleft;
2946 args.wasdel = ap->wasdel;
2947 args.isfl = 0;
2948 args.userdata = ap->userdata;
2949 if ((error = xfs_alloc_vextent(&args)))
2950 return error;
2951 if (tryagain && args.fsbno == NULLFSBLOCK) {
2952 /*
2953 * Exact allocation failed. Now try with alignment
2954 * turned on.
2955 */
2956 args.type = atype;
2957 args.fsbno = ap->rval;
2958 args.alignment = mp->m_dalign;
2959 args.minlen = nextminlen;
2960 args.minalignslop = 0;
2961 isaligned = 1;
2962 if ((error = xfs_alloc_vextent(&args)))
2963 return error;
2964 }
2965 if (isaligned && args.fsbno == NULLFSBLOCK) {
2966 /*
2967 * allocation failed, so turn off alignment and
2968 * try again.
2969 */
2970 args.type = atype;
2971 args.fsbno = ap->rval;
2972 args.alignment = 0;
2973 if ((error = xfs_alloc_vextent(&args)))
2974 return error;
2975 }
2976 if (args.fsbno == NULLFSBLOCK && nullfb &&
2977 args.minlen > ap->minlen) {
2978 args.minlen = ap->minlen;
2979 args.type = XFS_ALLOCTYPE_START_BNO;
2980 args.fsbno = ap->rval;
2981 if ((error = xfs_alloc_vextent(&args)))
2982 return error;
2983 }
2984 if (args.fsbno == NULLFSBLOCK && nullfb) {
2985 args.fsbno = 0;
2986 args.type = XFS_ALLOCTYPE_FIRST_AG;
2987 args.total = ap->minlen;
2988 args.minleft = 0;
2989 if ((error = xfs_alloc_vextent(&args)))
2990 return error;
2991 ap->low = 1;
2992 }
2993 if (args.fsbno != NULLFSBLOCK) {
2994 ap->firstblock = ap->rval = args.fsbno;
2995 ASSERT(nullfb || fb_agno == args.agno ||
2996 (ap->low && fb_agno < args.agno));
2997 ap->alen = args.len;
2998 ap->ip->i_d.di_nblocks += args.len;
2999 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
3000 if (ap->wasdel)
3001 ap->ip->i_delayed_blks -= args.len;
3002 /*
3003 * Adjust the disk quota also. This was reserved
3004 * earlier.
3005 */
3006 XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
3007 ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
3008 XFS_TRANS_DQ_BCOUNT,
3009 (long) args.len);
3010 } else {
3011 ap->rval = NULLFSBLOCK;
3012 ap->alen = 0;
3013 }
3014 return 0;
3015 }
3016
3017 /*
3018 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
3019 * It figures out where to ask the underlying allocator to put the new extent.
3020 */
3021 STATIC int
3022 xfs_bmap_alloc(
3023 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
3024 {
3025 if (XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata)
3026 return xfs_bmap_rtalloc(ap);
3027 return xfs_bmap_btalloc(ap);
3028 }
3029
3030 /*
3031 * Transform a btree format file with only one leaf node, where the
3032 * extents list will fit in the inode, into an extents format file.
3033 * Since the file extents are already in-core, all we have to do is
3034 * give up the space for the btree root and pitch the leaf block.
3035 */
3036 STATIC int /* error */
3037 xfs_bmap_btree_to_extents(
3038 xfs_trans_t *tp, /* transaction pointer */
3039 xfs_inode_t *ip, /* incore inode pointer */
3040 xfs_btree_cur_t *cur, /* btree cursor */
3041 int *logflagsp, /* inode logging flags */
3042 int whichfork) /* data or attr fork */
3043 {
3044 /* REFERENCED */
3045 struct xfs_btree_block *cblock;/* child btree block */
3046 xfs_fsblock_t cbno; /* child block number */
3047 xfs_buf_t *cbp; /* child block's buffer */
3048 int error; /* error return value */
3049 xfs_ifork_t *ifp; /* inode fork data */
3050 xfs_mount_t *mp; /* mount point structure */
3051 __be64 *pp; /* ptr to block address */
3052 struct xfs_btree_block *rblock;/* root btree block */
3053
3054 mp = ip->i_mount;
3055 ifp = XFS_IFORK_PTR(ip, whichfork);
3056 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
3057 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
3058 rblock = ifp->if_broot;
3059 ASSERT(be16_to_cpu(rblock->bb_level) == 1);
3060 ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
3061 ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1);
3062 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes);
3063 cbno = be64_to_cpu(*pp);
3064 *logflagsp = 0;
3065 #ifdef DEBUG
3066 if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
3067 return error;
3068 #endif
3069 if ((error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp,
3070 XFS_BMAP_BTREE_REF)))
3071 return error;
3072 cblock = XFS_BUF_TO_BLOCK(cbp);
3073 if ((error = xfs_btree_check_block(cur, cblock, 0, cbp)))
3074 return error;
3075 xfs_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
3076 ip->i_d.di_nblocks--;
3077 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
3078 xfs_trans_binval(tp, cbp);
3079 if (cur->bc_bufs[0] == cbp)
3080 cur->bc_bufs[0] = NULL;
3081 xfs_iroot_realloc(ip, -1, whichfork);
3082 ASSERT(ifp->if_broot == NULL);
3083 ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
3084 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
3085 *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
3086 return 0;
3087 }
3088
3089 /*
3090 * Called by xfs_bmapi to update file extent records and the btree
3091 * after removing space (or undoing a delayed allocation).
3092 */
3093 STATIC int /* error */
3094 xfs_bmap_del_extent(
3095 xfs_inode_t *ip, /* incore inode pointer */
3096 xfs_trans_t *tp, /* current transaction pointer */
3097 xfs_extnum_t idx, /* extent number to update/delete */
3098 xfs_bmap_free_t *flist, /* list of extents to be freed */
3099 xfs_btree_cur_t *cur, /* if null, not a btree */
3100 xfs_bmbt_irec_t *del, /* data to remove from extents */
3101 int *logflagsp, /* inode logging flags */
3102 xfs_extdelta_t *delta, /* Change made to incore extents */
3103 int whichfork, /* data or attr fork */
3104 int rsvd) /* OK to allocate reserved blocks */
3105 {
3106 xfs_filblks_t da_new; /* new delay-alloc indirect blocks */
3107 xfs_filblks_t da_old; /* old delay-alloc indirect blocks */
3108 xfs_fsblock_t del_endblock=0; /* first block past del */
3109 xfs_fileoff_t del_endoff; /* first offset past del */
3110 int delay; /* current block is delayed allocated */
3111 int do_fx; /* free extent at end of routine */
3112 xfs_bmbt_rec_host_t *ep; /* current extent entry pointer */
3113 int error; /* error return value */
3114 int flags; /* inode logging flags */
3115 xfs_bmbt_irec_t got; /* current extent entry */
3116 xfs_fileoff_t got_endoff; /* first offset past got */
3117 int i; /* temp state */
3118 xfs_ifork_t *ifp; /* inode fork pointer */
3119 xfs_mount_t *mp; /* mount structure */
3120 xfs_filblks_t nblks; /* quota/sb block count */
3121 xfs_bmbt_irec_t new; /* new record to be inserted */
3122 /* REFERENCED */
3123 uint qfield; /* quota field to update */
3124 xfs_filblks_t temp; /* for indirect length calculations */
3125 xfs_filblks_t temp2; /* for indirect length calculations */
3126
3127 XFS_STATS_INC(xs_del_exlist);
3128 mp = ip->i_mount;
3129 ifp = XFS_IFORK_PTR(ip, whichfork);
3130 ASSERT((idx >= 0) && (idx < ifp->if_bytes /
3131 (uint)sizeof(xfs_bmbt_rec_t)));
3132 ASSERT(del->br_blockcount > 0);
3133 ep = xfs_iext_get_ext(ifp, idx);
3134 xfs_bmbt_get_all(ep, &got);
3135 ASSERT(got.br_startoff <= del->br_startoff);
3136 del_endoff = del->br_startoff + del->br_blockcount;
3137 got_endoff = got.br_startoff + got.br_blockcount;
3138 ASSERT(got_endoff >= del_endoff);
3139 delay = ISNULLSTARTBLOCK(got.br_startblock);
3140 ASSERT(ISNULLSTARTBLOCK(del->br_startblock) == delay);
3141 flags = 0;
3142 qfield = 0;
3143 error = 0;
3144 /*
3145 * If deleting a real allocation, must free up the disk space.
3146 */
3147 if (!delay) {
3148 flags = XFS_ILOG_CORE;
3149 /*
3150 * Realtime allocation. Free it and record di_nblocks update.
3151 */
3152 if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
3153 xfs_fsblock_t bno;
3154 xfs_filblks_t len;
3155
3156 ASSERT(do_mod(del->br_blockcount,
3157 mp->m_sb.sb_rextsize) == 0);
3158 ASSERT(do_mod(del->br_startblock,
3159 mp->m_sb.sb_rextsize) == 0);
3160 bno = del->br_startblock;
3161 len = del->br_blockcount;
3162 do_div(bno, mp->m_sb.sb_rextsize);
3163 do_div(len, mp->m_sb.sb_rextsize);
3164 if ((error = xfs_rtfree_extent(ip->i_transp, bno,
3165 (xfs_extlen_t)len)))
3166 goto done;
3167 do_fx = 0;
3168 nblks = len * mp->m_sb.sb_rextsize;
3169 qfield = XFS_TRANS_DQ_RTBCOUNT;
3170 }
3171 /*
3172 * Ordinary allocation.
3173 */
3174 else {
3175 do_fx = 1;
3176 nblks = del->br_blockcount;
3177 qfield = XFS_TRANS_DQ_BCOUNT;
3178 }
3179 /*
3180 * Set up del_endblock and cur for later.
3181 */
3182 del_endblock = del->br_startblock + del->br_blockcount;
3183 if (cur) {
3184 if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
3185 got.br_startblock, got.br_blockcount,
3186 &i)))
3187 goto done;
3188 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
3189 }
3190 da_old = da_new = 0;
3191 } else {
3192 da_old = STARTBLOCKVAL(got.br_startblock);
3193 da_new = 0;
3194 nblks = 0;
3195 do_fx = 0;
3196 }
3197 /*
3198 * Set flag value to use in switch statement.
3199 * Left-contig is 2, right-contig is 1.
3200 */
3201 switch (((got.br_startoff == del->br_startoff) << 1) |
3202 (got_endoff == del_endoff)) {
3203 case 3:
3204 /*
3205 * Matches the whole extent. Delete the entry.
3206 */
3207 XFS_BMAP_TRACE_DELETE("3", ip, idx, 1, whichfork);
3208 xfs_iext_remove(ifp, idx, 1);
3209 ifp->if_lastex = idx;
3210 if (delay)
3211 break;
3212 XFS_IFORK_NEXT_SET(ip, whichfork,
3213 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
3214 flags |= XFS_ILOG_CORE;
3215 if (!cur) {
3216 flags |= XFS_ILOG_FEXT(whichfork);
3217 break;
3218 }
3219 if ((error = xfs_btree_delete(cur, &i)))
3220 goto done;
3221 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
3222 break;
3223
3224 case 2:
3225 /*
3226 * Deleting the first part of the extent.
3227 */
3228 XFS_BMAP_TRACE_PRE_UPDATE("2", ip, idx, whichfork);
3229 xfs_bmbt_set_startoff(ep, del_endoff);
3230 temp = got.br_blockcount - del->br_blockcount;
3231 xfs_bmbt_set_blockcount(ep, temp);
3232 ifp->if_lastex = idx;
3233 if (delay) {
3234 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
3235 da_old);
3236 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
3237 XFS_BMAP_TRACE_POST_UPDATE("2", ip, idx,
3238 whichfork);
3239 da_new = temp;
3240 break;
3241 }
3242 xfs_bmbt_set_startblock(ep, del_endblock);
3243 XFS_BMAP_TRACE_POST_UPDATE("2", ip, idx, whichfork);
3244 if (!cur) {
3245 flags |= XFS_ILOG_FEXT(whichfork);
3246 break;
3247 }
3248 if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
3249 got.br_blockcount - del->br_blockcount,
3250 got.br_state)))
3251 goto done;
3252 break;
3253
3254 case 1:
3255 /*
3256 * Deleting the last part of the extent.
3257 */
3258 temp = got.br_blockcount - del->br_blockcount;
3259 XFS_BMAP_TRACE_PRE_UPDATE("1", ip, idx, whichfork);
3260 xfs_bmbt_set_blockcount(ep, temp);
3261 ifp->if_lastex = idx;
3262 if (delay) {
3263 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
3264 da_old);
3265 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
3266 XFS_BMAP_TRACE_POST_UPDATE("1", ip, idx,
3267 whichfork);
3268 da_new = temp;
3269 break;
3270 }
3271 XFS_BMAP_TRACE_POST_UPDATE("1", ip, idx, whichfork);
3272 if (!cur) {
3273 flags |= XFS_ILOG_FEXT(whichfork);
3274 break;
3275 }
3276 if ((error = xfs_bmbt_update(cur, got.br_startoff,
3277 got.br_startblock,
3278 got.br_blockcount - del->br_blockcount,
3279 got.br_state)))
3280 goto done;
3281 break;
3282
3283 case 0:
3284 /*
3285 * Deleting the middle of the extent.
3286 */
3287 temp = del->br_startoff - got.br_startoff;
3288 XFS_BMAP_TRACE_PRE_UPDATE("0", ip, idx, whichfork);
3289 xfs_bmbt_set_blockcount(ep, temp);
3290 new.br_startoff = del_endoff;
3291 temp2 = got_endoff - del_endoff;
3292 new.br_blockcount = temp2;
3293 new.br_state = got.br_state;
3294 if (!delay) {
3295 new.br_startblock = del_endblock;
3296 flags |= XFS_ILOG_CORE;
3297 if (cur) {
3298 if ((error = xfs_bmbt_update(cur,
3299 got.br_startoff,
3300 got.br_startblock, temp,
3301 got.br_state)))
3302 goto done;
3303 if ((error = xfs_btree_increment(cur, 0, &i)))
3304 goto done;
3305 cur->bc_rec.b = new;
3306 error = xfs_btree_insert(cur, &i);
3307 if (error && error != ENOSPC)
3308 goto done;
3309 /*
3310 * If get no-space back from btree insert,
3311 * it tried a split, and we have a zero
3312 * block reservation.
3313 * Fix up our state and return the error.
3314 */
3315 if (error == ENOSPC) {
3316 /*
3317 * Reset the cursor, don't trust
3318 * it after any insert operation.
3319 */
3320 if ((error = xfs_bmbt_lookup_eq(cur,
3321 got.br_startoff,
3322 got.br_startblock,
3323 temp, &i)))
3324 goto done;
3325 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
3326 /*
3327 * Update the btree record back
3328 * to the original value.
3329 */
3330 if ((error = xfs_bmbt_update(cur,
3331 got.br_startoff,
3332 got.br_startblock,
3333 got.br_blockcount,
3334 got.br_state)))
3335 goto done;
3336 /*
3337 * Reset the extent record back
3338 * to the original value.
3339 */
3340 xfs_bmbt_set_blockcount(ep,
3341 got.br_blockcount);
3342 flags = 0;
3343 error = XFS_ERROR(ENOSPC);
3344 goto done;
3345 }
3346 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
3347 } else
3348 flags |= XFS_ILOG_FEXT(whichfork);
3349 XFS_IFORK_NEXT_SET(ip, whichfork,
3350 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
3351 } else {
3352 ASSERT(whichfork == XFS_DATA_FORK);
3353 temp = xfs_bmap_worst_indlen(ip, temp);
3354 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
3355 temp2 = xfs_bmap_worst_indlen(ip, temp2);
3356 new.br_startblock = NULLSTARTBLOCK((int)temp2);
3357 da_new = temp + temp2;
3358 while (da_new > da_old) {
3359 if (temp) {
3360 temp--;
3361 da_new--;
3362 xfs_bmbt_set_startblock(ep,
3363 NULLSTARTBLOCK((int)temp));
3364 }
3365 if (da_new == da_old)
3366 break;
3367 if (temp2) {
3368 temp2--;
3369 da_new--;
3370 new.br_startblock =
3371 NULLSTARTBLOCK((int)temp2);
3372 }
3373 }
3374 }
3375 XFS_BMAP_TRACE_POST_UPDATE("0", ip, idx, whichfork);
3376 XFS_BMAP_TRACE_INSERT("0", ip, idx + 1, 1, &new, NULL,
3377 whichfork);
3378 xfs_iext_insert(ifp, idx + 1, 1, &new);
3379 ifp->if_lastex = idx + 1;
3380 break;
3381 }
3382 /*
3383 * If we need to, add to list of extents to delete.
3384 */
3385 if (do_fx)
3386 xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
3387 mp);
3388 /*
3389 * Adjust inode # blocks in the file.
3390 */
3391 if (nblks)
3392 ip->i_d.di_nblocks -= nblks;
3393 /*
3394 * Adjust quota data.
3395 */
3396 if (qfield)
3397 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, qfield, (long)-nblks);
3398
3399 /*
3400 * Account for change in delayed indirect blocks.
3401 * Nothing to do for disk quota accounting here.
3402 */
3403 ASSERT(da_old >= da_new);
3404 if (da_old > da_new)
3405 xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, (int64_t)(da_old - da_new),
3406 rsvd);
3407 if (delta) {
3408 /* DELTA: report the original extent. */
3409 if (delta->xed_startoff > got.br_startoff)
3410 delta->xed_startoff = got.br_startoff;
3411 if (delta->xed_blockcount < got.br_startoff+got.br_blockcount)
3412 delta->xed_blockcount = got.br_startoff +
3413 got.br_blockcount;
3414 }
3415 done:
3416 *logflagsp = flags;
3417 return error;
3418 }
3419
3420 /*
3421 * Remove the entry "free" from the free item list. Prev points to the
3422 * previous entry, unless "free" is the head of the list.
3423 */
3424 STATIC void
3425 xfs_bmap_del_free(
3426 xfs_bmap_free_t *flist, /* free item list header */
3427 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
3428 xfs_bmap_free_item_t *free) /* list item to be freed */
3429 {
3430 if (prev)
3431 prev->xbfi_next = free->xbfi_next;
3432 else
3433 flist->xbf_first = free->xbfi_next;
3434 flist->xbf_count--;
3435 kmem_zone_free(xfs_bmap_free_item_zone, free);
3436 }
3437
3438 /*
3439 * Convert an extents-format file into a btree-format file.
3440 * The new file will have a root block (in the inode) and a single child block.
3441 */
3442 STATIC int /* error */
3443 xfs_bmap_extents_to_btree(
3444 xfs_trans_t *tp, /* transaction pointer */
3445 xfs_inode_t *ip, /* incore inode pointer */
3446 xfs_fsblock_t *firstblock, /* first-block-allocated */
3447 xfs_bmap_free_t *flist, /* blocks freed in xaction */
3448 xfs_btree_cur_t **curp, /* cursor returned to caller */
3449 int wasdel, /* converting a delayed alloc */
3450 int *logflagsp, /* inode logging flags */
3451 int whichfork) /* data or attr fork */
3452 {
3453 struct xfs_btree_block *ablock; /* allocated (child) bt block */
3454 xfs_buf_t *abp; /* buffer for ablock */
3455 xfs_alloc_arg_t args; /* allocation arguments */
3456 xfs_bmbt_rec_t *arp; /* child record pointer */
3457 struct xfs_btree_block *block; /* btree root block */
3458 xfs_btree_cur_t *cur; /* bmap btree cursor */
3459 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3460 int error; /* error return value */
3461 xfs_extnum_t i, cnt; /* extent record index */
3462 xfs_ifork_t *ifp; /* inode fork pointer */
3463 xfs_bmbt_key_t *kp; /* root block key pointer */
3464 xfs_mount_t *mp; /* mount structure */
3465 xfs_extnum_t nextents; /* number of file extents */
3466 xfs_bmbt_ptr_t *pp; /* root block address pointer */
3467
3468 ifp = XFS_IFORK_PTR(ip, whichfork);
3469 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
3470 ASSERT(ifp->if_ext_max ==
3471 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
3472 /*
3473 * Make space in the inode incore.
3474 */
3475 xfs_iroot_realloc(ip, 1, whichfork);
3476 ifp->if_flags |= XFS_IFBROOT;
3477
3478 /*
3479 * Fill in the root.
3480 */
3481 block = ifp->if_broot;
3482 block->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3483 block->bb_level = cpu_to_be16(1);
3484 block->bb_numrecs = cpu_to_be16(1);
3485 block->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
3486 block->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
3487
3488 /*
3489 * Need a cursor. Can't allocate until bb_level is filled in.
3490 */
3491 mp = ip->i_mount;
3492 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
3493 cur->bc_private.b.firstblock = *firstblock;
3494 cur->bc_private.b.flist = flist;
3495 cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
3496 /*
3497 * Convert to a btree with two levels, one record in root.
3498 */
3499 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
3500 args.tp = tp;
3501 args.mp = mp;
3502 args.firstblock = *firstblock;
3503 if (*firstblock == NULLFSBLOCK) {
3504 args.type = XFS_ALLOCTYPE_START_BNO;
3505 args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
3506 } else if (flist->xbf_low) {
3507 args.type = XFS_ALLOCTYPE_START_BNO;
3508 args.fsbno = *firstblock;
3509 } else {
3510 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3511 args.fsbno = *firstblock;
3512 }
3513 args.minlen = args.maxlen = args.prod = 1;
3514 args.total = args.minleft = args.alignment = args.mod = args.isfl =
3515 args.minalignslop = 0;
3516 args.wasdel = wasdel;
3517 *logflagsp = 0;
3518 if ((error = xfs_alloc_vextent(&args))) {
3519 xfs_iroot_realloc(ip, -1, whichfork);
3520 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
3521 return error;
3522 }
3523 /*
3524 * Allocation can't fail, the space was reserved.
3525 */
3526 ASSERT(args.fsbno != NULLFSBLOCK);
3527 ASSERT(*firstblock == NULLFSBLOCK ||
3528 args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) ||
3529 (flist->xbf_low &&
3530 args.agno > XFS_FSB_TO_AGNO(mp, *firstblock)));
3531 *firstblock = cur->bc_private.b.firstblock = args.fsbno;
3532 cur->bc_private.b.allocated++;
3533 ip->i_d.di_nblocks++;
3534 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
3535 abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
3536 /*
3537 * Fill in the child block.
3538 */
3539 ablock = XFS_BUF_TO_BLOCK(abp);
3540 ablock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3541 ablock->bb_level = 0;
3542 ablock->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
3543 ablock->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
3544 arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
3545 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3546 for (cnt = i = 0; i < nextents; i++) {
3547 ep = xfs_iext_get_ext(ifp, i);
3548 if (!ISNULLSTARTBLOCK(xfs_bmbt_get_startblock(ep))) {
3549 arp->l0 = cpu_to_be64(ep->l0);
3550 arp->l1 = cpu_to_be64(ep->l1);
3551 arp++; cnt++;
3552 }
3553 }
3554 ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
3555 xfs_btree_set_numrecs(ablock, cnt);
3556
3557 /*
3558 * Fill in the root key and pointer.
3559 */
3560 kp = XFS_BMBT_KEY_ADDR(mp, block, 1);
3561 arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
3562 kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
3563 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur,
3564 be16_to_cpu(block->bb_level)));
3565 *pp = cpu_to_be64(args.fsbno);
3566
3567 /*
3568 * Do all this logging at the end so that
3569 * the root is at the right level.
3570 */
3571 xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS);
3572 xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
3573 ASSERT(*curp == NULL);
3574 *curp = cur;
3575 *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FBROOT(whichfork);
3576 return 0;
3577 }
3578
3579 /*
3580 * Helper routine to reset inode di_forkoff field when switching
3581 * attribute fork from local to extent format - we reset it where
3582 * possible to make space available for inline data fork extents.
3583 */
3584 STATIC void
3585 xfs_bmap_forkoff_reset(
3586 xfs_mount_t *mp,
3587 xfs_inode_t *ip,
3588 int whichfork)
3589 {
3590 if (whichfork == XFS_ATTR_FORK &&
3591 (ip->i_d.di_format != XFS_DINODE_FMT_DEV) &&
3592 (ip->i_d.di_format != XFS_DINODE_FMT_UUID) &&
3593 (ip->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
3594 ((mp->m_attroffset >> 3) > ip->i_d.di_forkoff)) {
3595 ip->i_d.di_forkoff = mp->m_attroffset >> 3;
3596 ip->i_df.if_ext_max = XFS_IFORK_DSIZE(ip) /
3597 (uint)sizeof(xfs_bmbt_rec_t);
3598 ip->i_afp->if_ext_max = XFS_IFORK_ASIZE(ip) /
3599 (uint)sizeof(xfs_bmbt_rec_t);
3600 }
3601 }
3602
3603 /*
3604 * Convert a local file to an extents file.
3605 * This code is out of bounds for data forks of regular files,
3606 * since the file data needs to get logged so things will stay consistent.
3607 * (The bmap-level manipulations are ok, though).
3608 */
3609 STATIC int /* error */
3610 xfs_bmap_local_to_extents(
3611 xfs_trans_t *tp, /* transaction pointer */
3612 xfs_inode_t *ip, /* incore inode pointer */
3613 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
3614 xfs_extlen_t total, /* total blocks needed by transaction */
3615 int *logflagsp, /* inode logging flags */
3616 int whichfork) /* data or attr fork */
3617 {
3618 int error; /* error return value */
3619 int flags; /* logging flags returned */
3620 xfs_ifork_t *ifp; /* inode fork pointer */
3621
3622 /*
3623 * We don't want to deal with the case of keeping inode data inline yet.
3624 * So sending the data fork of a regular inode is invalid.
3625 */
3626 ASSERT(!((ip->i_d.di_mode & S_IFMT) == S_IFREG &&
3627 whichfork == XFS_DATA_FORK));
3628 ifp = XFS_IFORK_PTR(ip, whichfork);
3629 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
3630 flags = 0;
3631 error = 0;
3632 if (ifp->if_bytes) {
3633 xfs_alloc_arg_t args; /* allocation arguments */
3634 xfs_buf_t *bp; /* buffer for extent block */
3635 xfs_bmbt_rec_host_t *ep;/* extent record pointer */
3636
3637 args.tp = tp;
3638 args.mp = ip->i_mount;
3639 args.firstblock = *firstblock;
3640 ASSERT((ifp->if_flags &
3641 (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) == XFS_IFINLINE);
3642 /*
3643 * Allocate a block. We know we need only one, since the
3644 * file currently fits in an inode.
3645 */
3646 if (*firstblock == NULLFSBLOCK) {
3647 args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
3648 args.type = XFS_ALLOCTYPE_START_BNO;
3649 } else {
3650 args.fsbno = *firstblock;
3651 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3652 }
3653 args.total = total;
3654 args.mod = args.minleft = args.alignment = args.wasdel =
3655 args.isfl = args.minalignslop = 0;
3656 args.minlen = args.maxlen = args.prod = 1;
3657 if ((error = xfs_alloc_vextent(&args)))
3658 goto done;
3659 /*
3660 * Can't fail, the space was reserved.
3661 */
3662 ASSERT(args.fsbno != NULLFSBLOCK);
3663 ASSERT(args.len == 1);
3664 *firstblock = args.fsbno;
3665 bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
3666 memcpy((char *)XFS_BUF_PTR(bp), ifp->if_u1.if_data,
3667 ifp->if_bytes);
3668 xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
3669 xfs_bmap_forkoff_reset(args.mp, ip, whichfork);
3670 xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
3671 xfs_iext_add(ifp, 0, 1);
3672 ep = xfs_iext_get_ext(ifp, 0);
3673 xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
3674 XFS_BMAP_TRACE_POST_UPDATE("new", ip, 0, whichfork);
3675 XFS_IFORK_NEXT_SET(ip, whichfork, 1);
3676 ip->i_d.di_nblocks = 1;
3677 XFS_TRANS_MOD_DQUOT_BYINO(args.mp, tp, ip,
3678 XFS_TRANS_DQ_BCOUNT, 1L);
3679 flags |= XFS_ILOG_FEXT(whichfork);
3680 } else {
3681 ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
3682 xfs_bmap_forkoff_reset(ip->i_mount, ip, whichfork);
3683 }
3684 ifp->if_flags &= ~XFS_IFINLINE;
3685 ifp->if_flags |= XFS_IFEXTENTS;
3686 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
3687 flags |= XFS_ILOG_CORE;
3688 done:
3689 *logflagsp = flags;
3690 return error;
3691 }
3692
3693 /*
3694 * Search the extent records for the entry containing block bno.
3695 * If bno lies in a hole, point to the next entry. If bno lies
3696 * past eof, *eofp will be set, and *prevp will contain the last
3697 * entry (null if none). Else, *lastxp will be set to the index
3698 * of the found entry; *gotp will contain the entry.
3699 */
3700 xfs_bmbt_rec_host_t * /* pointer to found extent entry */
3701 xfs_bmap_search_multi_extents(
3702 xfs_ifork_t *ifp, /* inode fork pointer */
3703 xfs_fileoff_t bno, /* block number searched for */
3704 int *eofp, /* out: end of file found */
3705 xfs_extnum_t *lastxp, /* out: last extent index */
3706 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3707 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3708 {
3709 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3710 xfs_extnum_t lastx; /* last extent index */
3711
3712 /*
3713 * Initialize the extent entry structure to catch access to
3714 * uninitialized br_startblock field.
3715 */
3716 gotp->br_startoff = 0xffa5a5a5a5a5a5a5LL;
3717 gotp->br_blockcount = 0xa55a5a5a5a5a5a5aLL;
3718 gotp->br_state = XFS_EXT_INVALID;
3719 #if XFS_BIG_BLKNOS
3720 gotp->br_startblock = 0xffffa5a5a5a5a5a5LL;
3721 #else
3722 gotp->br_startblock = 0xffffa5a5;
3723 #endif
3724 prevp->br_startoff = NULLFILEOFF;
3725
3726 ep = xfs_iext_bno_to_ext(ifp, bno, &lastx);
3727 if (lastx > 0) {
3728 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx - 1), prevp);
3729 }
3730 if (lastx < (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
3731 xfs_bmbt_get_all(ep, gotp);
3732 *eofp = 0;
3733 } else {
3734 if (lastx > 0) {
3735 *gotp = *prevp;
3736 }
3737 *eofp = 1;
3738 ep = NULL;
3739 }
3740 *lastxp = lastx;
3741 return ep;
3742 }
3743
3744 /*
3745 * Search the extents list for the inode, for the extent containing bno.
3746 * If bno lies in a hole, point to the next entry. If bno lies past eof,
3747 * *eofp will be set, and *prevp will contain the last entry (null if none).
3748 * Else, *lastxp will be set to the index of the found
3749 * entry; *gotp will contain the entry.
3750 */
3751 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
3752 xfs_bmap_search_extents(
3753 xfs_inode_t *ip, /* incore inode pointer */
3754 xfs_fileoff_t bno, /* block number searched for */
3755 int fork, /* data or attr fork */
3756 int *eofp, /* out: end of file found */
3757 xfs_extnum_t *lastxp, /* out: last extent index */
3758 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3759 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3760 {
3761 xfs_ifork_t *ifp; /* inode fork pointer */
3762 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3763
3764 XFS_STATS_INC(xs_look_exlist);
3765 ifp = XFS_IFORK_PTR(ip, fork);
3766
3767 ep = xfs_bmap_search_multi_extents(ifp, bno, eofp, lastxp, gotp, prevp);
3768
3769 if (unlikely(!(gotp->br_startblock) && (*lastxp != NULLEXTNUM) &&
3770 !(XFS_IS_REALTIME_INODE(ip) && fork == XFS_DATA_FORK))) {
3771 xfs_cmn_err(XFS_PTAG_FSBLOCK_ZERO, CE_ALERT, ip->i_mount,
3772 "Access to block zero in inode %llu "
3773 "start_block: %llx start_off: %llx "
3774 "blkcnt: %llx extent-state: %x lastx: %x\n",
3775 (unsigned long long)ip->i_ino,
3776 (unsigned long long)gotp->br_startblock,
3777 (unsigned long long)gotp->br_startoff,
3778 (unsigned long long)gotp->br_blockcount,
3779 gotp->br_state, *lastxp);
3780 *lastxp = NULLEXTNUM;
3781 *eofp = 1;
3782 return NULL;
3783 }
3784 return ep;
3785 }
3786
3787
3788 #ifdef XFS_BMAP_TRACE
3789 ktrace_t *xfs_bmap_trace_buf;
3790
3791 /*
3792 * Add a bmap trace buffer entry. Base routine for the others.
3793 */
3794 STATIC void
3795 xfs_bmap_trace_addentry(
3796 int opcode, /* operation */
3797 const char *fname, /* function name */
3798 char *desc, /* operation description */
3799 xfs_inode_t *ip, /* incore inode pointer */
3800 xfs_extnum_t idx, /* index of entry(ies) */
3801 xfs_extnum_t cnt, /* count of entries, 1 or 2 */
3802 xfs_bmbt_rec_host_t *r1, /* first record */
3803 xfs_bmbt_rec_host_t *r2, /* second record or null */
3804 int whichfork) /* data or attr fork */
3805 {
3806 xfs_bmbt_rec_host_t tr2;
3807
3808 ASSERT(cnt == 1 || cnt == 2);
3809 ASSERT(r1 != NULL);
3810 if (cnt == 1) {
3811 ASSERT(r2 == NULL);
3812 r2 = &tr2;
3813 memset(&tr2, 0, sizeof(tr2));
3814 } else
3815 ASSERT(r2 != NULL);
3816 ktrace_enter(xfs_bmap_trace_buf,
3817 (void *)(__psint_t)(opcode | (whichfork << 16)),
3818 (void *)fname, (void *)desc, (void *)ip,
3819 (void *)(__psint_t)idx,
3820 (void *)(__psint_t)cnt,
3821 (void *)(__psunsigned_t)(ip->i_ino >> 32),
3822 (void *)(__psunsigned_t)(unsigned)ip->i_ino,
3823 (void *)(__psunsigned_t)(r1->l0 >> 32),
3824 (void *)(__psunsigned_t)(unsigned)(r1->l0),
3825 (void *)(__psunsigned_t)(r1->l1 >> 32),
3826 (void *)(__psunsigned_t)(unsigned)(r1->l1),
3827 (void *)(__psunsigned_t)(r2->l0 >> 32),
3828 (void *)(__psunsigned_t)(unsigned)(r2->l0),
3829 (void *)(__psunsigned_t)(r2->l1 >> 32),
3830 (void *)(__psunsigned_t)(unsigned)(r2->l1)
3831 );
3832 ASSERT(ip->i_xtrace);
3833 ktrace_enter(ip->i_xtrace,
3834 (void *)(__psint_t)(opcode | (whichfork << 16)),
3835 (void *)fname, (void *)desc, (void *)ip,
3836 (void *)(__psint_t)idx,
3837 (void *)(__psint_t)cnt,
3838 (void *)(__psunsigned_t)(ip->i_ino >> 32),
3839 (void *)(__psunsigned_t)(unsigned)ip->i_ino,
3840 (void *)(__psunsigned_t)(r1->l0 >> 32),
3841 (void *)(__psunsigned_t)(unsigned)(r1->l0),
3842 (void *)(__psunsigned_t)(r1->l1 >> 32),
3843 (void *)(__psunsigned_t)(unsigned)(r1->l1),
3844 (void *)(__psunsigned_t)(r2->l0 >> 32),
3845 (void *)(__psunsigned_t)(unsigned)(r2->l0),
3846 (void *)(__psunsigned_t)(r2->l1 >> 32),
3847 (void *)(__psunsigned_t)(unsigned)(r2->l1)
3848 );
3849 }
3850
3851 /*
3852 * Add bmap trace entry prior to a call to xfs_iext_remove.
3853 */
3854 STATIC void
3855 xfs_bmap_trace_delete(
3856 const char *fname, /* function name */
3857 char *desc, /* operation description */
3858 xfs_inode_t *ip, /* incore inode pointer */
3859 xfs_extnum_t idx, /* index of entry(entries) deleted */
3860 xfs_extnum_t cnt, /* count of entries deleted, 1 or 2 */
3861 int whichfork) /* data or attr fork */
3862 {
3863 xfs_ifork_t *ifp; /* inode fork pointer */
3864
3865 ifp = XFS_IFORK_PTR(ip, whichfork);
3866 xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_DELETE, fname, desc, ip, idx,
3867 cnt, xfs_iext_get_ext(ifp, idx),
3868 cnt == 2 ? xfs_iext_get_ext(ifp, idx + 1) : NULL,
3869 whichfork);
3870 }
3871
3872 /*
3873 * Add bmap trace entry prior to a call to xfs_iext_insert, or
3874 * reading in the extents list from the disk (in the btree).
3875 */
3876 STATIC void
3877 xfs_bmap_trace_insert(
3878 const char *fname, /* function name */
3879 char *desc, /* operation description */
3880 xfs_inode_t *ip, /* incore inode pointer */
3881 xfs_extnum_t idx, /* index of entry(entries) inserted */
3882 xfs_extnum_t cnt, /* count of entries inserted, 1 or 2 */
3883 xfs_bmbt_irec_t *r1, /* inserted record 1 */
3884 xfs_bmbt_irec_t *r2, /* inserted record 2 or null */
3885 int whichfork) /* data or attr fork */
3886 {
3887 xfs_bmbt_rec_host_t tr1; /* compressed record 1 */
3888 xfs_bmbt_rec_host_t tr2; /* compressed record 2 if needed */
3889
3890 xfs_bmbt_set_all(&tr1, r1);
3891 if (cnt == 2) {
3892 ASSERT(r2 != NULL);
3893 xfs_bmbt_set_all(&tr2, r2);
3894 } else {
3895 ASSERT(cnt == 1);
3896 ASSERT(r2 == NULL);
3897 }
3898 xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_INSERT, fname, desc, ip, idx,
3899 cnt, &tr1, cnt == 2 ? &tr2 : NULL, whichfork);
3900 }
3901
3902 /*
3903 * Add bmap trace entry after updating an extent record in place.
3904 */
3905 STATIC void
3906 xfs_bmap_trace_post_update(
3907 const char *fname, /* function name */
3908 char *desc, /* operation description */
3909 xfs_inode_t *ip, /* incore inode pointer */
3910 xfs_extnum_t idx, /* index of entry updated */
3911 int whichfork) /* data or attr fork */
3912 {
3913 xfs_ifork_t *ifp; /* inode fork pointer */
3914
3915 ifp = XFS_IFORK_PTR(ip, whichfork);
3916 xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_POST_UP, fname, desc, ip, idx,
3917 1, xfs_iext_get_ext(ifp, idx), NULL, whichfork);
3918 }
3919
3920 /*
3921 * Add bmap trace entry prior to updating an extent record in place.
3922 */
3923 STATIC void
3924 xfs_bmap_trace_pre_update(
3925 const char *fname, /* function name */
3926 char *desc, /* operation description */
3927 xfs_inode_t *ip, /* incore inode pointer */
3928 xfs_extnum_t idx, /* index of entry to be updated */
3929 int whichfork) /* data or attr fork */
3930 {
3931 xfs_ifork_t *ifp; /* inode fork pointer */
3932
3933 ifp = XFS_IFORK_PTR(ip, whichfork);
3934 xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_PRE_UP, fname, desc, ip, idx, 1,
3935 xfs_iext_get_ext(ifp, idx), NULL, whichfork);
3936 }
3937 #endif /* XFS_BMAP_TRACE */
3938
3939 /*
3940 * Compute the worst-case number of indirect blocks that will be used
3941 * for ip's delayed extent of length "len".
3942 */
3943 STATIC xfs_filblks_t
3944 xfs_bmap_worst_indlen(
3945 xfs_inode_t *ip, /* incore inode pointer */
3946 xfs_filblks_t len) /* delayed extent length */
3947 {
3948 int level; /* btree level number */
3949 int maxrecs; /* maximum record count at this level */
3950 xfs_mount_t *mp; /* mount structure */
3951 xfs_filblks_t rval; /* return value */
3952
3953 mp = ip->i_mount;
3954 maxrecs = mp->m_bmap_dmxr[0];
3955 for (level = 0, rval = 0;
3956 level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
3957 level++) {
3958 len += maxrecs - 1;
3959 do_div(len, maxrecs);
3960 rval += len;
3961 if (len == 1)
3962 return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
3963 level - 1;
3964 if (level == 0)
3965 maxrecs = mp->m_bmap_dmxr[1];
3966 }
3967 return rval;
3968 }
3969
3970 #if defined(XFS_RW_TRACE)
3971 STATIC void
3972 xfs_bunmap_trace(
3973 xfs_inode_t *ip,
3974 xfs_fileoff_t bno,
3975 xfs_filblks_t len,
3976 int flags,
3977 inst_t *ra)
3978 {
3979 if (ip->i_rwtrace == NULL)
3980 return;
3981 ktrace_enter(ip->i_rwtrace,
3982 (void *)(__psint_t)XFS_BUNMAP,
3983 (void *)ip,
3984 (void *)(__psint_t)((ip->i_d.di_size >> 32) & 0xffffffff),
3985 (void *)(__psint_t)(ip->i_d.di_size & 0xffffffff),
3986 (void *)(__psint_t)(((xfs_dfiloff_t)bno >> 32) & 0xffffffff),
3987 (void *)(__psint_t)((xfs_dfiloff_t)bno & 0xffffffff),
3988 (void *)(__psint_t)len,
3989 (void *)(__psint_t)flags,
3990 (void *)(unsigned long)current_cpu(),
3991 (void *)ra,
3992 (void *)0,
3993 (void *)0,
3994 (void *)0,
3995 (void *)0,
3996 (void *)0,
3997 (void *)0);
3998 }
3999 #endif
4000
4001 /*
4002 * Convert inode from non-attributed to attributed.
4003 * Must not be in a transaction, ip must not be locked.
4004 */
4005 int /* error code */
4006 xfs_bmap_add_attrfork(
4007 xfs_inode_t *ip, /* incore inode pointer */
4008 int size, /* space new attribute needs */
4009 int rsvd) /* xact may use reserved blks */
4010 {
4011 xfs_fsblock_t firstblock; /* 1st block/ag allocated */
4012 xfs_bmap_free_t flist; /* freed extent records */
4013 xfs_mount_t *mp; /* mount structure */
4014 xfs_trans_t *tp; /* transaction pointer */
4015 int blks; /* space reservation */
4016 int version = 1; /* superblock attr version */
4017 int committed; /* xaction was committed */
4018 int logflags; /* logging flags */
4019 int error; /* error return value */
4020
4021 ASSERT(XFS_IFORK_Q(ip) == 0);
4022 ASSERT(ip->i_df.if_ext_max ==
4023 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
4024
4025 mp = ip->i_mount;
4026 ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
4027 tp = xfs_trans_alloc(mp, XFS_TRANS_ADDAFORK);
4028 blks = XFS_ADDAFORK_SPACE_RES(mp);
4029 if (rsvd)
4030 tp->t_flags |= XFS_TRANS_RESERVE;
4031 if ((error = xfs_trans_reserve(tp, blks, XFS_ADDAFORK_LOG_RES(mp), 0,
4032 XFS_TRANS_PERM_LOG_RES, XFS_ADDAFORK_LOG_COUNT)))
4033 goto error0;
4034 xfs_ilock(ip, XFS_ILOCK_EXCL);
4035 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, blks, 0, rsvd ?
4036 XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
4037 XFS_QMOPT_RES_REGBLKS);
4038 if (error) {
4039 xfs_iunlock(ip, XFS_ILOCK_EXCL);
4040 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
4041 return error;
4042 }
4043 if (XFS_IFORK_Q(ip))
4044 goto error1;
4045 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
4046 /*
4047 * For inodes coming from pre-6.2 filesystems.
4048 */
4049 ASSERT(ip->i_d.di_aformat == 0);
4050 ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
4051 }
4052 ASSERT(ip->i_d.di_anextents == 0);
4053 IHOLD(ip);
4054 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
4055 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
4056 switch (ip->i_d.di_format) {
4057 case XFS_DINODE_FMT_DEV:
4058 ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
4059 break;
4060 case XFS_DINODE_FMT_UUID:
4061 ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
4062 break;
4063 case XFS_DINODE_FMT_LOCAL:
4064 case XFS_DINODE_FMT_EXTENTS:
4065 case XFS_DINODE_FMT_BTREE:
4066 ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
4067 if (!ip->i_d.di_forkoff)
4068 ip->i_d.di_forkoff = mp->m_attroffset >> 3;
4069 else if (mp->m_flags & XFS_MOUNT_ATTR2)
4070 version = 2;
4071 break;
4072 default:
4073 ASSERT(0);
4074 error = XFS_ERROR(EINVAL);
4075 goto error1;
4076 }
4077 ip->i_df.if_ext_max =
4078 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
4079 ASSERT(ip->i_afp == NULL);
4080 ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
4081 ip->i_afp->if_ext_max =
4082 XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
4083 ip->i_afp->if_flags = XFS_IFEXTENTS;
4084 logflags = 0;
4085 XFS_BMAP_INIT(&flist, &firstblock);
4086 switch (ip->i_d.di_format) {
4087 case XFS_DINODE_FMT_LOCAL:
4088 error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &flist,
4089 &logflags);
4090 break;
4091 case XFS_DINODE_FMT_EXTENTS:
4092 error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
4093 &flist, &logflags);
4094 break;
4095 case XFS_DINODE_FMT_BTREE:
4096 error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &flist,
4097 &logflags);
4098 break;
4099 default:
4100 error = 0;
4101 break;
4102 }
4103 if (logflags)
4104 xfs_trans_log_inode(tp, ip, logflags);
4105 if (error)
4106 goto error2;
4107 if (!xfs_sb_version_hasattr(&mp->m_sb) ||
4108 (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2)) {
4109 __int64_t sbfields = 0;
4110
4111 spin_lock(&mp->m_sb_lock);
4112 if (!xfs_sb_version_hasattr(&mp->m_sb)) {
4113 xfs_sb_version_addattr(&mp->m_sb);
4114 sbfields |= XFS_SB_VERSIONNUM;
4115 }
4116 if (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2) {
4117 xfs_sb_version_addattr2(&mp->m_sb);
4118 sbfields |= (XFS_SB_VERSIONNUM | XFS_SB_FEATURES2);
4119 }
4120 if (sbfields) {
4121 spin_unlock(&mp->m_sb_lock);
4122 xfs_mod_sb(tp, sbfields);
4123 } else
4124 spin_unlock(&mp->m_sb_lock);
4125 }
4126 if ((error = xfs_bmap_finish(&tp, &flist, &committed)))
4127 goto error2;
4128 error = xfs_trans_commit(tp, XFS_TRANS_PERM_LOG_RES);
4129 ASSERT(ip->i_df.if_ext_max ==
4130 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
4131 return error;
4132 error2:
4133 xfs_bmap_cancel(&flist);
4134 error1:
4135 xfs_iunlock(ip, XFS_ILOCK_EXCL);
4136 error0:
4137 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
4138 ASSERT(ip->i_df.if_ext_max ==
4139 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
4140 return error;
4141 }
4142
4143 /*
4144 * Add the extent to the list of extents to be free at transaction end.
4145 * The list is maintained sorted (by block number).
4146 */
4147 /* ARGSUSED */
4148 void
4149 xfs_bmap_add_free(
4150 xfs_fsblock_t bno, /* fs block number of extent */
4151 xfs_filblks_t len, /* length of extent */
4152 xfs_bmap_free_t *flist, /* list of extents */
4153 xfs_mount_t *mp) /* mount point structure */
4154 {
4155 xfs_bmap_free_item_t *cur; /* current (next) element */
4156 xfs_bmap_free_item_t *new; /* new element */
4157 xfs_bmap_free_item_t *prev; /* previous element */
4158 #ifdef DEBUG
4159 xfs_agnumber_t agno;
4160 xfs_agblock_t agbno;
4161
4162 ASSERT(bno != NULLFSBLOCK);
4163 ASSERT(len > 0);
4164 ASSERT(len <= MAXEXTLEN);
4165 ASSERT(!ISNULLSTARTBLOCK(bno));
4166 agno = XFS_FSB_TO_AGNO(mp, bno);
4167 agbno = XFS_FSB_TO_AGBNO(mp, bno);
4168 ASSERT(agno < mp->m_sb.sb_agcount);
4169 ASSERT(agbno < mp->m_sb.sb_agblocks);
4170 ASSERT(len < mp->m_sb.sb_agblocks);
4171 ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
4172 #endif
4173 ASSERT(xfs_bmap_free_item_zone != NULL);
4174 new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
4175 new->xbfi_startblock = bno;
4176 new->xbfi_blockcount = (xfs_extlen_t)len;
4177 for (prev = NULL, cur = flist->xbf_first;
4178 cur != NULL;
4179 prev = cur, cur = cur->xbfi_next) {
4180 if (cur->xbfi_startblock >= bno)
4181 break;
4182 }
4183 if (prev)
4184 prev->xbfi_next = new;
4185 else
4186 flist->xbf_first = new;
4187 new->xbfi_next = cur;
4188 flist->xbf_count++;
4189 }
4190
4191 /*
4192 * Compute and fill in the value of the maximum depth of a bmap btree
4193 * in this filesystem. Done once, during mount.
4194 */
4195 void
4196 xfs_bmap_compute_maxlevels(
4197 xfs_mount_t *mp, /* file system mount structure */
4198 int whichfork) /* data or attr fork */
4199 {
4200 int level; /* btree level */
4201 uint maxblocks; /* max blocks at this level */
4202 uint maxleafents; /* max leaf entries possible */
4203 int maxrootrecs; /* max records in root block */
4204 int minleafrecs; /* min records in leaf block */
4205 int minnoderecs; /* min records in node block */
4206 int sz; /* root block size */
4207
4208 /*
4209 * The maximum number of extents in a file, hence the maximum
4210 * number of leaf entries, is controlled by the type of di_nextents
4211 * (a signed 32-bit number, xfs_extnum_t), or by di_anextents
4212 * (a signed 16-bit number, xfs_aextnum_t).
4213 *
4214 * Note that we can no longer assume that if we are in ATTR1 that
4215 * the fork offset of all the inodes will be (m_attroffset >> 3)
4216 * because we could have mounted with ATTR2 and then mounted back
4217 * with ATTR1, keeping the di_forkoff's fixed but probably at
4218 * various positions. Therefore, for both ATTR1 and ATTR2
4219 * we have to assume the worst case scenario of a minimum size
4220 * available.
4221 */
4222 if (whichfork == XFS_DATA_FORK) {
4223 maxleafents = MAXEXTNUM;
4224 sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
4225 } else {
4226 maxleafents = MAXAEXTNUM;
4227 sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
4228 }
4229 maxrootrecs = xfs_bmdr_maxrecs(mp, sz, 0);
4230 minleafrecs = mp->m_bmap_dmnr[0];
4231 minnoderecs = mp->m_bmap_dmnr[1];
4232 maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
4233 for (level = 1; maxblocks > 1; level++) {
4234 if (maxblocks <= maxrootrecs)
4235 maxblocks = 1;
4236 else
4237 maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
4238 }
4239 mp->m_bm_maxlevels[whichfork] = level;
4240 }
4241
4242 /*
4243 * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
4244 * caller. Frees all the extents that need freeing, which must be done
4245 * last due to locking considerations. We never free any extents in
4246 * the first transaction. This is to allow the caller to make the first
4247 * transaction a synchronous one so that the pointers to the data being
4248 * broken in this transaction will be permanent before the data is actually
4249 * freed. This is necessary to prevent blocks from being reallocated
4250 * and written to before the free and reallocation are actually permanent.
4251 * We do not just make the first transaction synchronous here, because
4252 * there are more efficient ways to gain the same protection in some cases
4253 * (see the file truncation code).
4254 *
4255 * Return 1 if the given transaction was committed and a new one
4256 * started, and 0 otherwise in the committed parameter.
4257 */
4258 /*ARGSUSED*/
4259 int /* error */
4260 xfs_bmap_finish(
4261 xfs_trans_t **tp, /* transaction pointer addr */
4262 xfs_bmap_free_t *flist, /* i/o: list extents to free */
4263 int *committed) /* xact committed or not */
4264 {
4265 xfs_efd_log_item_t *efd; /* extent free data */
4266 xfs_efi_log_item_t *efi; /* extent free intention */
4267 int error; /* error return value */
4268 xfs_bmap_free_item_t *free; /* free extent item */
4269 unsigned int logres; /* new log reservation */
4270 unsigned int logcount; /* new log count */
4271 xfs_mount_t *mp; /* filesystem mount structure */
4272 xfs_bmap_free_item_t *next; /* next item on free list */
4273 xfs_trans_t *ntp; /* new transaction pointer */
4274
4275 ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
4276 if (flist->xbf_count == 0) {
4277 *committed = 0;
4278 return 0;
4279 }
4280 ntp = *tp;
4281 efi = xfs_trans_get_efi(ntp, flist->xbf_count);
4282 for (free = flist->xbf_first; free; free = free->xbfi_next)
4283 xfs_trans_log_efi_extent(ntp, efi, free->xbfi_startblock,
4284 free->xbfi_blockcount);
4285 logres = ntp->t_log_res;
4286 logcount = ntp->t_log_count;
4287 ntp = xfs_trans_dup(*tp);
4288 error = xfs_trans_commit(*tp, 0);
4289 *tp = ntp;
4290 *committed = 1;
4291 /*
4292 * We have a new transaction, so we should return committed=1,
4293 * even though we're returning an error.
4294 */
4295 if (error)
4296 return error;
4297
4298 /*
4299 * transaction commit worked ok so we can drop the extra ticket
4300 * reference that we gained in xfs_trans_dup()
4301 */
4302 xfs_log_ticket_put(ntp->t_ticket);
4303
4304 if ((error = xfs_trans_reserve(ntp, 0, logres, 0, XFS_TRANS_PERM_LOG_RES,
4305 logcount)))
4306 return error;
4307 efd = xfs_trans_get_efd(ntp, efi, flist->xbf_count);
4308 for (free = flist->xbf_first; free != NULL; free = next) {
4309 next = free->xbfi_next;
4310 if ((error = xfs_free_extent(ntp, free->xbfi_startblock,
4311 free->xbfi_blockcount))) {
4312 /*
4313 * The bmap free list will be cleaned up at a
4314 * higher level. The EFI will be canceled when
4315 * this transaction is aborted.
4316 * Need to force shutdown here to make sure it
4317 * happens, since this transaction may not be
4318 * dirty yet.
4319 */
4320 mp = ntp->t_mountp;
4321 if (!XFS_FORCED_SHUTDOWN(mp))
4322 xfs_force_shutdown(mp,
4323 (error == EFSCORRUPTED) ?
4324 SHUTDOWN_CORRUPT_INCORE :
4325 SHUTDOWN_META_IO_ERROR);
4326 return error;
4327 }
4328 xfs_trans_log_efd_extent(ntp, efd, free->xbfi_startblock,
4329 free->xbfi_blockcount);
4330 xfs_bmap_del_free(flist, NULL, free);
4331 }
4332 return 0;
4333 }
4334
4335 /*
4336 * Free up any items left in the list.
4337 */
4338 void
4339 xfs_bmap_cancel(
4340 xfs_bmap_free_t *flist) /* list of bmap_free_items */
4341 {
4342 xfs_bmap_free_item_t *free; /* free list item */
4343 xfs_bmap_free_item_t *next;
4344
4345 if (flist->xbf_count == 0)
4346 return;
4347 ASSERT(flist->xbf_first != NULL);
4348 for (free = flist->xbf_first; free; free = next) {
4349 next = free->xbfi_next;
4350 xfs_bmap_del_free(flist, NULL, free);
4351 }
4352 ASSERT(flist->xbf_count == 0);
4353 }
4354
4355 /*
4356 * Returns the file-relative block number of the first unused block(s)
4357 * in the file with at least "len" logically contiguous blocks free.
4358 * This is the lowest-address hole if the file has holes, else the first block
4359 * past the end of file.
4360 * Return 0 if the file is currently local (in-inode).
4361 */
4362 int /* error */
4363 xfs_bmap_first_unused(
4364 xfs_trans_t *tp, /* transaction pointer */
4365 xfs_inode_t *ip, /* incore inode */
4366 xfs_extlen_t len, /* size of hole to find */
4367 xfs_fileoff_t *first_unused, /* unused block */
4368 int whichfork) /* data or attr fork */
4369 {
4370 int error; /* error return value */
4371 int idx; /* extent record index */
4372 xfs_ifork_t *ifp; /* inode fork pointer */
4373 xfs_fileoff_t lastaddr; /* last block number seen */
4374 xfs_fileoff_t lowest; /* lowest useful block */
4375 xfs_fileoff_t max; /* starting useful block */
4376 xfs_fileoff_t off; /* offset for this block */
4377 xfs_extnum_t nextents; /* number of extent entries */
4378
4379 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
4380 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
4381 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
4382 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4383 *first_unused = 0;
4384 return 0;
4385 }
4386 ifp = XFS_IFORK_PTR(ip, whichfork);
4387 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4388 (error = xfs_iread_extents(tp, ip, whichfork)))
4389 return error;
4390 lowest = *first_unused;
4391 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4392 for (idx = 0, lastaddr = 0, max = lowest; idx < nextents; idx++) {
4393 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
4394 off = xfs_bmbt_get_startoff(ep);
4395 /*
4396 * See if the hole before this extent will work.
4397 */
4398 if (off >= lowest + len && off - max >= len) {
4399 *first_unused = max;
4400 return 0;
4401 }
4402 lastaddr = off + xfs_bmbt_get_blockcount(ep);
4403 max = XFS_FILEOFF_MAX(lastaddr, lowest);
4404 }
4405 *first_unused = max;
4406 return 0;
4407 }
4408
4409 /*
4410 * Returns the file-relative block number of the last block + 1 before
4411 * last_block (input value) in the file.
4412 * This is not based on i_size, it is based on the extent records.
4413 * Returns 0 for local files, as they do not have extent records.
4414 */
4415 int /* error */
4416 xfs_bmap_last_before(
4417 xfs_trans_t *tp, /* transaction pointer */
4418 xfs_inode_t *ip, /* incore inode */
4419 xfs_fileoff_t *last_block, /* last block */
4420 int whichfork) /* data or attr fork */
4421 {
4422 xfs_fileoff_t bno; /* input file offset */
4423 int eof; /* hit end of file */
4424 xfs_bmbt_rec_host_t *ep; /* pointer to last extent */
4425 int error; /* error return value */
4426 xfs_bmbt_irec_t got; /* current extent value */
4427 xfs_ifork_t *ifp; /* inode fork pointer */
4428 xfs_extnum_t lastx; /* last extent used */
4429 xfs_bmbt_irec_t prev; /* previous extent value */
4430
4431 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4432 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4433 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
4434 return XFS_ERROR(EIO);
4435 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4436 *last_block = 0;
4437 return 0;
4438 }
4439 ifp = XFS_IFORK_PTR(ip, whichfork);
4440 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4441 (error = xfs_iread_extents(tp, ip, whichfork)))
4442 return error;
4443 bno = *last_block - 1;
4444 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
4445 &prev);
4446 if (eof || xfs_bmbt_get_startoff(ep) > bno) {
4447 if (prev.br_startoff == NULLFILEOFF)
4448 *last_block = 0;
4449 else
4450 *last_block = prev.br_startoff + prev.br_blockcount;
4451 }
4452 /*
4453 * Otherwise *last_block is already the right answer.
4454 */
4455 return 0;
4456 }
4457
4458 /*
4459 * Returns the file-relative block number of the first block past eof in
4460 * the file. This is not based on i_size, it is based on the extent records.
4461 * Returns 0 for local files, as they do not have extent records.
4462 */
4463 int /* error */
4464 xfs_bmap_last_offset(
4465 xfs_trans_t *tp, /* transaction pointer */
4466 xfs_inode_t *ip, /* incore inode */
4467 xfs_fileoff_t *last_block, /* last block */
4468 int whichfork) /* data or attr fork */
4469 {
4470 xfs_bmbt_rec_host_t *ep; /* pointer to last extent */
4471 int error; /* error return value */
4472 xfs_ifork_t *ifp; /* inode fork pointer */
4473 xfs_extnum_t nextents; /* number of extent entries */
4474
4475 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4476 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4477 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
4478 return XFS_ERROR(EIO);
4479 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4480 *last_block = 0;
4481 return 0;
4482 }
4483 ifp = XFS_IFORK_PTR(ip, whichfork);
4484 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4485 (error = xfs_iread_extents(tp, ip, whichfork)))
4486 return error;
4487 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4488 if (!nextents) {
4489 *last_block = 0;
4490 return 0;
4491 }
4492 ep = xfs_iext_get_ext(ifp, nextents - 1);
4493 *last_block = xfs_bmbt_get_startoff(ep) + xfs_bmbt_get_blockcount(ep);
4494 return 0;
4495 }
4496
4497 /*
4498 * Returns whether the selected fork of the inode has exactly one
4499 * block or not. For the data fork we check this matches di_size,
4500 * implying the file's range is 0..bsize-1.
4501 */
4502 int /* 1=>1 block, 0=>otherwise */
4503 xfs_bmap_one_block(
4504 xfs_inode_t *ip, /* incore inode */
4505 int whichfork) /* data or attr fork */
4506 {
4507 xfs_bmbt_rec_host_t *ep; /* ptr to fork's extent */
4508 xfs_ifork_t *ifp; /* inode fork pointer */
4509 int rval; /* return value */
4510 xfs_bmbt_irec_t s; /* internal version of extent */
4511
4512 #ifndef DEBUG
4513 if (whichfork == XFS_DATA_FORK) {
4514 return ((ip->i_d.di_mode & S_IFMT) == S_IFREG) ?
4515 (ip->i_size == ip->i_mount->m_sb.sb_blocksize) :
4516 (ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize);
4517 }
4518 #endif /* !DEBUG */
4519 if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
4520 return 0;
4521 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
4522 return 0;
4523 ifp = XFS_IFORK_PTR(ip, whichfork);
4524 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
4525 ep = xfs_iext_get_ext(ifp, 0);
4526 xfs_bmbt_get_all(ep, &s);
4527 rval = s.br_startoff == 0 && s.br_blockcount == 1;
4528 if (rval && whichfork == XFS_DATA_FORK)
4529 ASSERT(ip->i_size == ip->i_mount->m_sb.sb_blocksize);
4530 return rval;
4531 }
4532
4533 STATIC int
4534 xfs_bmap_sanity_check(
4535 struct xfs_mount *mp,
4536 struct xfs_buf *bp,
4537 int level)
4538 {
4539 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
4540
4541 if (be32_to_cpu(block->bb_magic) != XFS_BMAP_MAGIC ||
4542 be16_to_cpu(block->bb_level) != level ||
4543 be16_to_cpu(block->bb_numrecs) == 0 ||
4544 be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
4545 return 0;
4546 return 1;
4547 }
4548
4549 /*
4550 * Read in the extents to if_extents.
4551 * All inode fields are set up by caller, we just traverse the btree
4552 * and copy the records in. If the file system cannot contain unwritten
4553 * extents, the records are checked for no "state" flags.
4554 */
4555 int /* error */
4556 xfs_bmap_read_extents(
4557 xfs_trans_t *tp, /* transaction pointer */
4558 xfs_inode_t *ip, /* incore inode */
4559 int whichfork) /* data or attr fork */
4560 {
4561 struct xfs_btree_block *block; /* current btree block */
4562 xfs_fsblock_t bno; /* block # of "block" */
4563 xfs_buf_t *bp; /* buffer for "block" */
4564 int error; /* error return value */
4565 xfs_exntfmt_t exntf; /* XFS_EXTFMT_NOSTATE, if checking */
4566 xfs_extnum_t i, j; /* index into the extents list */
4567 xfs_ifork_t *ifp; /* fork structure */
4568 int level; /* btree level, for checking */
4569 xfs_mount_t *mp; /* file system mount structure */
4570 __be64 *pp; /* pointer to block address */
4571 /* REFERENCED */
4572 xfs_extnum_t room; /* number of entries there's room for */
4573
4574 bno = NULLFSBLOCK;
4575 mp = ip->i_mount;
4576 ifp = XFS_IFORK_PTR(ip, whichfork);
4577 exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE :
4578 XFS_EXTFMT_INODE(ip);
4579 block = ifp->if_broot;
4580 /*
4581 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
4582 */
4583 level = be16_to_cpu(block->bb_level);
4584 ASSERT(level > 0);
4585 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
4586 bno = be64_to_cpu(*pp);
4587 ASSERT(bno != NULLDFSBNO);
4588 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
4589 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
4590 /*
4591 * Go down the tree until leaf level is reached, following the first
4592 * pointer (leftmost) at each level.
4593 */
4594 while (level-- > 0) {
4595 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4596 XFS_BMAP_BTREE_REF)))
4597 return error;
4598 block = XFS_BUF_TO_BLOCK(bp);
4599 XFS_WANT_CORRUPTED_GOTO(
4600 xfs_bmap_sanity_check(mp, bp, level),
4601 error0);
4602 if (level == 0)
4603 break;
4604 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
4605 bno = be64_to_cpu(*pp);
4606 XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
4607 xfs_trans_brelse(tp, bp);
4608 }
4609 /*
4610 * Here with bp and block set to the leftmost leaf node in the tree.
4611 */
4612 room = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4613 i = 0;
4614 /*
4615 * Loop over all leaf nodes. Copy information to the extent records.
4616 */
4617 for (;;) {
4618 xfs_bmbt_rec_t *frp;
4619 xfs_fsblock_t nextbno;
4620 xfs_extnum_t num_recs;
4621 xfs_extnum_t start;
4622
4623
4624 num_recs = xfs_btree_get_numrecs(block);
4625 if (unlikely(i + num_recs > room)) {
4626 ASSERT(i + num_recs <= room);
4627 xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
4628 "corrupt dinode %Lu, (btree extents).",
4629 (unsigned long long) ip->i_ino);
4630 XFS_ERROR_REPORT("xfs_bmap_read_extents(1)",
4631 XFS_ERRLEVEL_LOW,
4632 ip->i_mount);
4633 goto error0;
4634 }
4635 XFS_WANT_CORRUPTED_GOTO(
4636 xfs_bmap_sanity_check(mp, bp, 0),
4637 error0);
4638 /*
4639 * Read-ahead the next leaf block, if any.
4640 */
4641 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
4642 if (nextbno != NULLFSBLOCK)
4643 xfs_btree_reada_bufl(mp, nextbno, 1);
4644 /*
4645 * Copy records into the extent records.
4646 */
4647 frp = XFS_BMBT_REC_ADDR(mp, block, 1);
4648 start = i;
4649 for (j = 0; j < num_recs; j++, i++, frp++) {
4650 xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i);
4651 trp->l0 = be64_to_cpu(frp->l0);
4652 trp->l1 = be64_to_cpu(frp->l1);
4653 }
4654 if (exntf == XFS_EXTFMT_NOSTATE) {
4655 /*
4656 * Check all attribute bmap btree records and
4657 * any "older" data bmap btree records for a
4658 * set bit in the "extent flag" position.
4659 */
4660 if (unlikely(xfs_check_nostate_extents(ifp,
4661 start, num_recs))) {
4662 XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
4663 XFS_ERRLEVEL_LOW,
4664 ip->i_mount);
4665 goto error0;
4666 }
4667 }
4668 xfs_trans_brelse(tp, bp);
4669 bno = nextbno;
4670 /*
4671 * If we've reached the end, stop.
4672 */
4673 if (bno == NULLFSBLOCK)
4674 break;
4675 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4676 XFS_BMAP_BTREE_REF)))
4677 return error;
4678 block = XFS_BUF_TO_BLOCK(bp);
4679 }
4680 ASSERT(i == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
4681 ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork));
4682 XFS_BMAP_TRACE_EXLIST(ip, i, whichfork);
4683 return 0;
4684 error0:
4685 xfs_trans_brelse(tp, bp);
4686 return XFS_ERROR(EFSCORRUPTED);
4687 }
4688
4689 #ifdef XFS_BMAP_TRACE
4690 /*
4691 * Add bmap trace insert entries for all the contents of the extent records.
4692 */
4693 void
4694 xfs_bmap_trace_exlist(
4695 const char *fname, /* function name */
4696 xfs_inode_t *ip, /* incore inode pointer */
4697 xfs_extnum_t cnt, /* count of entries in the list */
4698 int whichfork) /* data or attr fork */
4699 {
4700 xfs_bmbt_rec_host_t *ep; /* current extent record */
4701 xfs_extnum_t idx; /* extent record index */
4702 xfs_ifork_t *ifp; /* inode fork pointer */
4703 xfs_bmbt_irec_t s; /* file extent record */
4704
4705 ifp = XFS_IFORK_PTR(ip, whichfork);
4706 ASSERT(cnt == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
4707 for (idx = 0; idx < cnt; idx++) {
4708 ep = xfs_iext_get_ext(ifp, idx);
4709 xfs_bmbt_get_all(ep, &s);
4710 XFS_BMAP_TRACE_INSERT("exlist", ip, idx, 1, &s, NULL,
4711 whichfork);
4712 }
4713 }
4714 #endif
4715
4716 #ifdef DEBUG
4717 /*
4718 * Validate that the bmbt_irecs being returned from bmapi are valid
4719 * given the callers original parameters. Specifically check the
4720 * ranges of the returned irecs to ensure that they only extent beyond
4721 * the given parameters if the XFS_BMAPI_ENTIRE flag was set.
4722 */
4723 STATIC void
4724 xfs_bmap_validate_ret(
4725 xfs_fileoff_t bno,
4726 xfs_filblks_t len,
4727 int flags,
4728 xfs_bmbt_irec_t *mval,
4729 int nmap,
4730 int ret_nmap)
4731 {
4732 int i; /* index to map values */
4733
4734 ASSERT(ret_nmap <= nmap);
4735
4736 for (i = 0; i < ret_nmap; i++) {
4737 ASSERT(mval[i].br_blockcount > 0);
4738 if (!(flags & XFS_BMAPI_ENTIRE)) {
4739 ASSERT(mval[i].br_startoff >= bno);
4740 ASSERT(mval[i].br_blockcount <= len);
4741 ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
4742 bno + len);
4743 } else {
4744 ASSERT(mval[i].br_startoff < bno + len);
4745 ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
4746 bno);
4747 }
4748 ASSERT(i == 0 ||
4749 mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
4750 mval[i].br_startoff);
4751 if ((flags & XFS_BMAPI_WRITE) && !(flags & XFS_BMAPI_DELAY))
4752 ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
4753 mval[i].br_startblock != HOLESTARTBLOCK);
4754 ASSERT(mval[i].br_state == XFS_EXT_NORM ||
4755 mval[i].br_state == XFS_EXT_UNWRITTEN);
4756 }
4757 }
4758 #endif /* DEBUG */
4759
4760
4761 /*
4762 * Map file blocks to filesystem blocks.
4763 * File range is given by the bno/len pair.
4764 * Adds blocks to file if a write ("flags & XFS_BMAPI_WRITE" set)
4765 * into a hole or past eof.
4766 * Only allocates blocks from a single allocation group,
4767 * to avoid locking problems.
4768 * The returned value in "firstblock" from the first call in a transaction
4769 * must be remembered and presented to subsequent calls in "firstblock".
4770 * An upper bound for the number of blocks to be allocated is supplied to
4771 * the first call in "total"; if no allocation group has that many free
4772 * blocks then the call will fail (return NULLFSBLOCK in "firstblock").
4773 */
4774 int /* error */
4775 xfs_bmapi(
4776 xfs_trans_t *tp, /* transaction pointer */
4777 xfs_inode_t *ip, /* incore inode */
4778 xfs_fileoff_t bno, /* starting file offs. mapped */
4779 xfs_filblks_t len, /* length to map in file */
4780 int flags, /* XFS_BMAPI_... */
4781 xfs_fsblock_t *firstblock, /* first allocated block
4782 controls a.g. for allocs */
4783 xfs_extlen_t total, /* total blocks needed */
4784 xfs_bmbt_irec_t *mval, /* output: map values */
4785 int *nmap, /* i/o: mval size/count */
4786 xfs_bmap_free_t *flist, /* i/o: list extents to free */
4787 xfs_extdelta_t *delta) /* o: change made to incore extents */
4788 {
4789 xfs_fsblock_t abno; /* allocated block number */
4790 xfs_extlen_t alen; /* allocated extent length */
4791 xfs_fileoff_t aoff; /* allocated file offset */
4792 xfs_bmalloca_t bma; /* args for xfs_bmap_alloc */
4793 xfs_btree_cur_t *cur; /* bmap btree cursor */
4794 xfs_fileoff_t end; /* end of mapped file region */
4795 int eof; /* we've hit the end of extents */
4796 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
4797 int error; /* error return */
4798 xfs_bmbt_irec_t got; /* current file extent record */
4799 xfs_ifork_t *ifp; /* inode fork pointer */
4800 xfs_extlen_t indlen; /* indirect blocks length */
4801 xfs_extnum_t lastx; /* last useful extent number */
4802 int logflags; /* flags for transaction logging */
4803 xfs_extlen_t minleft; /* min blocks left after allocation */
4804 xfs_extlen_t minlen; /* min allocation size */
4805 xfs_mount_t *mp; /* xfs mount structure */
4806 int n; /* current extent index */
4807 int nallocs; /* number of extents alloc\'d */
4808 xfs_extnum_t nextents; /* number of extents in file */
4809 xfs_fileoff_t obno; /* old block number (offset) */
4810 xfs_bmbt_irec_t prev; /* previous file extent record */
4811 int tmp_logflags; /* temp flags holder */
4812 int whichfork; /* data or attr fork */
4813 char inhole; /* current location is hole in file */
4814 char wasdelay; /* old extent was delayed */
4815 char wr; /* this is a write request */
4816 char rt; /* this is a realtime file */
4817 #ifdef DEBUG
4818 xfs_fileoff_t orig_bno; /* original block number value */
4819 int orig_flags; /* original flags arg value */
4820 xfs_filblks_t orig_len; /* original value of len arg */
4821 xfs_bmbt_irec_t *orig_mval; /* original value of mval */
4822 int orig_nmap; /* original value of *nmap */
4823
4824 orig_bno = bno;
4825 orig_len = len;
4826 orig_flags = flags;
4827 orig_mval = mval;
4828 orig_nmap = *nmap;
4829 #endif
4830 ASSERT(*nmap >= 1);
4831 ASSERT(*nmap <= XFS_BMAP_MAX_NMAP || !(flags & XFS_BMAPI_WRITE));
4832 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4833 XFS_ATTR_FORK : XFS_DATA_FORK;
4834 mp = ip->i_mount;
4835 if (unlikely(XFS_TEST_ERROR(
4836 (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4837 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4838 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL),
4839 mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
4840 XFS_ERROR_REPORT("xfs_bmapi", XFS_ERRLEVEL_LOW, mp);
4841 return XFS_ERROR(EFSCORRUPTED);
4842 }
4843 if (XFS_FORCED_SHUTDOWN(mp))
4844 return XFS_ERROR(EIO);
4845 rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
4846 ifp = XFS_IFORK_PTR(ip, whichfork);
4847 ASSERT(ifp->if_ext_max ==
4848 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
4849 if ((wr = (flags & XFS_BMAPI_WRITE)) != 0)
4850 XFS_STATS_INC(xs_blk_mapw);
4851 else
4852 XFS_STATS_INC(xs_blk_mapr);
4853 /*
4854 * IGSTATE flag is used to combine extents which
4855 * differ only due to the state of the extents.
4856 * This technique is used from xfs_getbmap()
4857 * when the caller does not wish to see the
4858 * separation (which is the default).
4859 *
4860 * This technique is also used when writing a
4861 * buffer which has been partially written,
4862 * (usually by being flushed during a chunkread),
4863 * to ensure one write takes place. This also
4864 * prevents a change in the xfs inode extents at
4865 * this time, intentionally. This change occurs
4866 * on completion of the write operation, in
4867 * xfs_strat_comp(), where the xfs_bmapi() call
4868 * is transactioned, and the extents combined.
4869 */
4870 if ((flags & XFS_BMAPI_IGSTATE) && wr) /* if writing unwritten space */
4871 wr = 0; /* no allocations are allowed */
4872 ASSERT(wr || !(flags & XFS_BMAPI_DELAY));
4873 logflags = 0;
4874 nallocs = 0;
4875 cur = NULL;
4876 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4877 ASSERT(wr && tp);
4878 if ((error = xfs_bmap_local_to_extents(tp, ip,
4879 firstblock, total, &logflags, whichfork)))
4880 goto error0;
4881 }
4882 if (wr && *firstblock == NULLFSBLOCK) {
4883 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
4884 minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1;
4885 else
4886 minleft = 1;
4887 } else
4888 minleft = 0;
4889 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4890 (error = xfs_iread_extents(tp, ip, whichfork)))
4891 goto error0;
4892 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
4893 &prev);
4894 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4895 n = 0;
4896 end = bno + len;
4897 obno = bno;
4898 bma.ip = NULL;
4899 if (delta) {
4900 delta->xed_startoff = NULLFILEOFF;
4901 delta->xed_blockcount = 0;
4902 }
4903 while (bno < end && n < *nmap) {
4904 /*
4905 * Reading past eof, act as though there's a hole
4906 * up to end.
4907 */
4908 if (eof && !wr)
4909 got.br_startoff = end;
4910 inhole = eof || got.br_startoff > bno;
4911 wasdelay = wr && !inhole && !(flags & XFS_BMAPI_DELAY) &&
4912 ISNULLSTARTBLOCK(got.br_startblock);
4913 /*
4914 * First, deal with the hole before the allocated space
4915 * that we found, if any.
4916 */
4917 if (wr && (inhole || wasdelay)) {
4918 /*
4919 * For the wasdelay case, we could also just
4920 * allocate the stuff asked for in this bmap call
4921 * but that wouldn't be as good.
4922 */
4923 if (wasdelay && !(flags & XFS_BMAPI_EXACT)) {
4924 alen = (xfs_extlen_t)got.br_blockcount;
4925 aoff = got.br_startoff;
4926 if (lastx != NULLEXTNUM && lastx) {
4927 ep = xfs_iext_get_ext(ifp, lastx - 1);
4928 xfs_bmbt_get_all(ep, &prev);
4929 }
4930 } else if (wasdelay) {
4931 alen = (xfs_extlen_t)
4932 XFS_FILBLKS_MIN(len,
4933 (got.br_startoff +
4934 got.br_blockcount) - bno);
4935 aoff = bno;
4936 } else {
4937 alen = (xfs_extlen_t)
4938 XFS_FILBLKS_MIN(len, MAXEXTLEN);
4939 if (!eof)
4940 alen = (xfs_extlen_t)
4941 XFS_FILBLKS_MIN(alen,
4942 got.br_startoff - bno);
4943 aoff = bno;
4944 }
4945 minlen = (flags & XFS_BMAPI_CONTIG) ? alen : 1;
4946 if (flags & XFS_BMAPI_DELAY) {
4947 xfs_extlen_t extsz;
4948
4949 /* Figure out the extent size, adjust alen */
4950 extsz = xfs_get_extsz_hint(ip);
4951 if (extsz) {
4952 error = xfs_bmap_extsize_align(mp,
4953 &got, &prev, extsz,
4954 rt, eof,
4955 flags&XFS_BMAPI_DELAY,
4956 flags&XFS_BMAPI_CONVERT,
4957 &aoff, &alen);
4958 ASSERT(!error);
4959 }
4960
4961 if (rt)
4962 extsz = alen / mp->m_sb.sb_rextsize;
4963
4964 /*
4965 * Make a transaction-less quota reservation for
4966 * delayed allocation blocks. This number gets
4967 * adjusted later. We return if we haven't
4968 * allocated blocks already inside this loop.
4969 */
4970 if ((error = XFS_TRANS_RESERVE_QUOTA_NBLKS(
4971 mp, NULL, ip, (long)alen, 0,
4972 rt ? XFS_QMOPT_RES_RTBLKS :
4973 XFS_QMOPT_RES_REGBLKS))) {
4974 if (n == 0) {
4975 *nmap = 0;
4976 ASSERT(cur == NULL);
4977 return error;
4978 }
4979 break;
4980 }
4981
4982 /*
4983 * Split changing sb for alen and indlen since
4984 * they could be coming from different places.
4985 */
4986 indlen = (xfs_extlen_t)
4987 xfs_bmap_worst_indlen(ip, alen);
4988 ASSERT(indlen > 0);
4989
4990 if (rt) {
4991 error = xfs_mod_incore_sb(mp,
4992 XFS_SBS_FREXTENTS,
4993 -((int64_t)extsz), (flags &
4994 XFS_BMAPI_RSVBLOCKS));
4995 } else {
4996 error = xfs_mod_incore_sb(mp,
4997 XFS_SBS_FDBLOCKS,
4998 -((int64_t)alen), (flags &
4999 XFS_BMAPI_RSVBLOCKS));
5000 }
5001 if (!error) {
5002 error = xfs_mod_incore_sb(mp,
5003 XFS_SBS_FDBLOCKS,
5004 -((int64_t)indlen), (flags &
5005 XFS_BMAPI_RSVBLOCKS));
5006 if (error && rt)
5007 xfs_mod_incore_sb(mp,
5008 XFS_SBS_FREXTENTS,
5009 (int64_t)extsz, (flags &
5010 XFS_BMAPI_RSVBLOCKS));
5011 else if (error)
5012 xfs_mod_incore_sb(mp,
5013 XFS_SBS_FDBLOCKS,
5014 (int64_t)alen, (flags &
5015 XFS_BMAPI_RSVBLOCKS));
5016 }
5017
5018 if (error) {
5019 if (XFS_IS_QUOTA_ON(mp))
5020 /* unreserve the blocks now */
5021 (void)
5022 XFS_TRANS_UNRESERVE_QUOTA_NBLKS(
5023 mp, NULL, ip,
5024 (long)alen, 0, rt ?
5025 XFS_QMOPT_RES_RTBLKS :
5026 XFS_QMOPT_RES_REGBLKS);
5027 break;
5028 }
5029
5030 ip->i_delayed_blks += alen;
5031 abno = NULLSTARTBLOCK(indlen);
5032 } else {
5033 /*
5034 * If first time, allocate and fill in
5035 * once-only bma fields.
5036 */
5037 if (bma.ip == NULL) {
5038 bma.tp = tp;
5039 bma.ip = ip;
5040 bma.prevp = &prev;
5041 bma.gotp = &got;
5042 bma.total = total;
5043 bma.userdata = 0;
5044 }
5045 /* Indicate if this is the first user data
5046 * in the file, or just any user data.
5047 */
5048 if (!(flags & XFS_BMAPI_METADATA)) {
5049 bma.userdata = (aoff == 0) ?
5050 XFS_ALLOC_INITIAL_USER_DATA :
5051 XFS_ALLOC_USERDATA;
5052 }
5053 /*
5054 * Fill in changeable bma fields.
5055 */
5056 bma.eof = eof;
5057 bma.firstblock = *firstblock;
5058 bma.alen = alen;
5059 bma.off = aoff;
5060 bma.conv = !!(flags & XFS_BMAPI_CONVERT);
5061 bma.wasdel = wasdelay;
5062 bma.minlen = minlen;
5063 bma.low = flist->xbf_low;
5064 bma.minleft = minleft;
5065 /*
5066 * Only want to do the alignment at the
5067 * eof if it is userdata and allocation length
5068 * is larger than a stripe unit.
5069 */
5070 if (mp->m_dalign && alen >= mp->m_dalign &&
5071 (!(flags & XFS_BMAPI_METADATA)) &&
5072 (whichfork == XFS_DATA_FORK)) {
5073 if ((error = xfs_bmap_isaeof(ip, aoff,
5074 whichfork, &bma.aeof)))
5075 goto error0;
5076 } else
5077 bma.aeof = 0;
5078 /*
5079 * Call allocator.
5080 */
5081 if ((error = xfs_bmap_alloc(&bma)))
5082 goto error0;
5083 /*
5084 * Copy out result fields.
5085 */
5086 abno = bma.rval;
5087 if ((flist->xbf_low = bma.low))
5088 minleft = 0;
5089 alen = bma.alen;
5090 aoff = bma.off;
5091 ASSERT(*firstblock == NULLFSBLOCK ||
5092 XFS_FSB_TO_AGNO(mp, *firstblock) ==
5093 XFS_FSB_TO_AGNO(mp, bma.firstblock) ||
5094 (flist->xbf_low &&
5095 XFS_FSB_TO_AGNO(mp, *firstblock) <
5096 XFS_FSB_TO_AGNO(mp, bma.firstblock)));
5097 *firstblock = bma.firstblock;
5098 if (cur)
5099 cur->bc_private.b.firstblock =
5100 *firstblock;
5101 if (abno == NULLFSBLOCK)
5102 break;
5103 if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
5104 cur = xfs_bmbt_init_cursor(mp, tp,
5105 ip, whichfork);
5106 cur->bc_private.b.firstblock =
5107 *firstblock;
5108 cur->bc_private.b.flist = flist;
5109 }
5110 /*
5111 * Bump the number of extents we've allocated
5112 * in this call.
5113 */
5114 nallocs++;
5115 }
5116 if (cur)
5117 cur->bc_private.b.flags =
5118 wasdelay ? XFS_BTCUR_BPRV_WASDEL : 0;
5119 got.br_startoff = aoff;
5120 got.br_startblock = abno;
5121 got.br_blockcount = alen;
5122 got.br_state = XFS_EXT_NORM; /* assume normal */
5123 /*
5124 * Determine state of extent, and the filesystem.
5125 * A wasdelay extent has been initialized, so
5126 * shouldn't be flagged as unwritten.
5127 */
5128 if (wr && xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5129 if (!wasdelay && (flags & XFS_BMAPI_PREALLOC))
5130 got.br_state = XFS_EXT_UNWRITTEN;
5131 }
5132 error = xfs_bmap_add_extent(ip, lastx, &cur, &got,
5133 firstblock, flist, &tmp_logflags, delta,
5134 whichfork, (flags & XFS_BMAPI_RSVBLOCKS));
5135 logflags |= tmp_logflags;
5136 if (error)
5137 goto error0;
5138 lastx = ifp->if_lastex;
5139 ep = xfs_iext_get_ext(ifp, lastx);
5140 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5141 xfs_bmbt_get_all(ep, &got);
5142 ASSERT(got.br_startoff <= aoff);
5143 ASSERT(got.br_startoff + got.br_blockcount >=
5144 aoff + alen);
5145 #ifdef DEBUG
5146 if (flags & XFS_BMAPI_DELAY) {
5147 ASSERT(ISNULLSTARTBLOCK(got.br_startblock));
5148 ASSERT(STARTBLOCKVAL(got.br_startblock) > 0);
5149 }
5150 ASSERT(got.br_state == XFS_EXT_NORM ||
5151 got.br_state == XFS_EXT_UNWRITTEN);
5152 #endif
5153 /*
5154 * Fall down into the found allocated space case.
5155 */
5156 } else if (inhole) {
5157 /*
5158 * Reading in a hole.
5159 */
5160 mval->br_startoff = bno;
5161 mval->br_startblock = HOLESTARTBLOCK;
5162 mval->br_blockcount =
5163 XFS_FILBLKS_MIN(len, got.br_startoff - bno);
5164 mval->br_state = XFS_EXT_NORM;
5165 bno += mval->br_blockcount;
5166 len -= mval->br_blockcount;
5167 mval++;
5168 n++;
5169 continue;
5170 }
5171 /*
5172 * Then deal with the allocated space we found.
5173 */
5174 ASSERT(ep != NULL);
5175 if (!(flags & XFS_BMAPI_ENTIRE) &&
5176 (got.br_startoff + got.br_blockcount > obno)) {
5177 if (obno > bno)
5178 bno = obno;
5179 ASSERT((bno >= obno) || (n == 0));
5180 ASSERT(bno < end);
5181 mval->br_startoff = bno;
5182 if (ISNULLSTARTBLOCK(got.br_startblock)) {
5183 ASSERT(!wr || (flags & XFS_BMAPI_DELAY));
5184 mval->br_startblock = DELAYSTARTBLOCK;
5185 } else
5186 mval->br_startblock =
5187 got.br_startblock +
5188 (bno - got.br_startoff);
5189 /*
5190 * Return the minimum of what we got and what we
5191 * asked for for the length. We can use the len
5192 * variable here because it is modified below
5193 * and we could have been there before coming
5194 * here if the first part of the allocation
5195 * didn't overlap what was asked for.
5196 */
5197 mval->br_blockcount =
5198 XFS_FILBLKS_MIN(end - bno, got.br_blockcount -
5199 (bno - got.br_startoff));
5200 mval->br_state = got.br_state;
5201 ASSERT(mval->br_blockcount <= len);
5202 } else {
5203 *mval = got;
5204 if (ISNULLSTARTBLOCK(mval->br_startblock)) {
5205 ASSERT(!wr || (flags & XFS_BMAPI_DELAY));
5206 mval->br_startblock = DELAYSTARTBLOCK;
5207 }
5208 }
5209
5210 /*
5211 * Check if writing previously allocated but
5212 * unwritten extents.
5213 */
5214 if (wr && mval->br_state == XFS_EXT_UNWRITTEN &&
5215 ((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_DELAY)) == 0)) {
5216 /*
5217 * Modify (by adding) the state flag, if writing.
5218 */
5219 ASSERT(mval->br_blockcount <= len);
5220 if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
5221 cur = xfs_bmbt_init_cursor(mp,
5222 tp, ip, whichfork);
5223 cur->bc_private.b.firstblock =
5224 *firstblock;
5225 cur->bc_private.b.flist = flist;
5226 }
5227 mval->br_state = XFS_EXT_NORM;
5228 error = xfs_bmap_add_extent(ip, lastx, &cur, mval,
5229 firstblock, flist, &tmp_logflags, delta,
5230 whichfork, (flags & XFS_BMAPI_RSVBLOCKS));
5231 logflags |= tmp_logflags;
5232 if (error)
5233 goto error0;
5234 lastx = ifp->if_lastex;
5235 ep = xfs_iext_get_ext(ifp, lastx);
5236 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5237 xfs_bmbt_get_all(ep, &got);
5238 /*
5239 * We may have combined previously unwritten
5240 * space with written space, so generate
5241 * another request.
5242 */
5243 if (mval->br_blockcount < len)
5244 continue;
5245 }
5246
5247 ASSERT((flags & XFS_BMAPI_ENTIRE) ||
5248 ((mval->br_startoff + mval->br_blockcount) <= end));
5249 ASSERT((flags & XFS_BMAPI_ENTIRE) ||
5250 (mval->br_blockcount <= len) ||
5251 (mval->br_startoff < obno));
5252 bno = mval->br_startoff + mval->br_blockcount;
5253 len = end - bno;
5254 if (n > 0 && mval->br_startoff == mval[-1].br_startoff) {
5255 ASSERT(mval->br_startblock == mval[-1].br_startblock);
5256 ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
5257 ASSERT(mval->br_state == mval[-1].br_state);
5258 mval[-1].br_blockcount = mval->br_blockcount;
5259 mval[-1].br_state = mval->br_state;
5260 } else if (n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
5261 mval[-1].br_startblock != DELAYSTARTBLOCK &&
5262 mval[-1].br_startblock != HOLESTARTBLOCK &&
5263 mval->br_startblock ==
5264 mval[-1].br_startblock + mval[-1].br_blockcount &&
5265 ((flags & XFS_BMAPI_IGSTATE) ||
5266 mval[-1].br_state == mval->br_state)) {
5267 ASSERT(mval->br_startoff ==
5268 mval[-1].br_startoff + mval[-1].br_blockcount);
5269 mval[-1].br_blockcount += mval->br_blockcount;
5270 } else if (n > 0 &&
5271 mval->br_startblock == DELAYSTARTBLOCK &&
5272 mval[-1].br_startblock == DELAYSTARTBLOCK &&
5273 mval->br_startoff ==
5274 mval[-1].br_startoff + mval[-1].br_blockcount) {
5275 mval[-1].br_blockcount += mval->br_blockcount;
5276 mval[-1].br_state = mval->br_state;
5277 } else if (!((n == 0) &&
5278 ((mval->br_startoff + mval->br_blockcount) <=
5279 obno))) {
5280 mval++;
5281 n++;
5282 }
5283 /*
5284 * If we're done, stop now. Stop when we've allocated
5285 * XFS_BMAP_MAX_NMAP extents no matter what. Otherwise
5286 * the transaction may get too big.
5287 */
5288 if (bno >= end || n >= *nmap || nallocs >= *nmap)
5289 break;
5290 /*
5291 * Else go on to the next record.
5292 */
5293 ep = xfs_iext_get_ext(ifp, ++lastx);
5294 prev = got;
5295 if (lastx >= nextents)
5296 eof = 1;
5297 else
5298 xfs_bmbt_get_all(ep, &got);
5299 }
5300 ifp->if_lastex = lastx;
5301 *nmap = n;
5302 /*
5303 * Transform from btree to extents, give it cur.
5304 */
5305 if (tp && XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
5306 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
5307 ASSERT(wr && cur);
5308 error = xfs_bmap_btree_to_extents(tp, ip, cur,
5309 &tmp_logflags, whichfork);
5310 logflags |= tmp_logflags;
5311 if (error)
5312 goto error0;
5313 }
5314 ASSERT(ifp->if_ext_max ==
5315 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5316 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
5317 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max);
5318 error = 0;
5319 if (delta && delta->xed_startoff != NULLFILEOFF) {
5320 /* A change was actually made.
5321 * Note that delta->xed_blockount is an offset at this
5322 * point and needs to be converted to a block count.
5323 */
5324 ASSERT(delta->xed_blockcount > delta->xed_startoff);
5325 delta->xed_blockcount -= delta->xed_startoff;
5326 }
5327 error0:
5328 /*
5329 * Log everything. Do this after conversion, there's no point in
5330 * logging the extent records if we've converted to btree format.
5331 */
5332 if ((logflags & XFS_ILOG_FEXT(whichfork)) &&
5333 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5334 logflags &= ~XFS_ILOG_FEXT(whichfork);
5335 else if ((logflags & XFS_ILOG_FBROOT(whichfork)) &&
5336 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5337 logflags &= ~XFS_ILOG_FBROOT(whichfork);
5338 /*
5339 * Log whatever the flags say, even if error. Otherwise we might miss
5340 * detecting a case where the data is changed, there's an error,
5341 * and it's not logged so we don't shutdown when we should.
5342 */
5343 if (logflags) {
5344 ASSERT(tp && wr);
5345 xfs_trans_log_inode(tp, ip, logflags);
5346 }
5347 if (cur) {
5348 if (!error) {
5349 ASSERT(*firstblock == NULLFSBLOCK ||
5350 XFS_FSB_TO_AGNO(mp, *firstblock) ==
5351 XFS_FSB_TO_AGNO(mp,
5352 cur->bc_private.b.firstblock) ||
5353 (flist->xbf_low &&
5354 XFS_FSB_TO_AGNO(mp, *firstblock) <
5355 XFS_FSB_TO_AGNO(mp,
5356 cur->bc_private.b.firstblock)));
5357 *firstblock = cur->bc_private.b.firstblock;
5358 }
5359 xfs_btree_del_cursor(cur,
5360 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5361 }
5362 if (!error)
5363 xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
5364 orig_nmap, *nmap);
5365 return error;
5366 }
5367
5368 /*
5369 * Map file blocks to filesystem blocks, simple version.
5370 * One block (extent) only, read-only.
5371 * For flags, only the XFS_BMAPI_ATTRFORK flag is examined.
5372 * For the other flag values, the effect is as if XFS_BMAPI_METADATA
5373 * was set and all the others were clear.
5374 */
5375 int /* error */
5376 xfs_bmapi_single(
5377 xfs_trans_t *tp, /* transaction pointer */
5378 xfs_inode_t *ip, /* incore inode */
5379 int whichfork, /* data or attr fork */
5380 xfs_fsblock_t *fsb, /* output: mapped block */
5381 xfs_fileoff_t bno) /* starting file offs. mapped */
5382 {
5383 int eof; /* we've hit the end of extents */
5384 int error; /* error return */
5385 xfs_bmbt_irec_t got; /* current file extent record */
5386 xfs_ifork_t *ifp; /* inode fork pointer */
5387 xfs_extnum_t lastx; /* last useful extent number */
5388 xfs_bmbt_irec_t prev; /* previous file extent record */
5389
5390 ifp = XFS_IFORK_PTR(ip, whichfork);
5391 if (unlikely(
5392 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
5393 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)) {
5394 XFS_ERROR_REPORT("xfs_bmapi_single", XFS_ERRLEVEL_LOW,
5395 ip->i_mount);
5396 return XFS_ERROR(EFSCORRUPTED);
5397 }
5398 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
5399 return XFS_ERROR(EIO);
5400 XFS_STATS_INC(xs_blk_mapr);
5401 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5402 (error = xfs_iread_extents(tp, ip, whichfork)))
5403 return error;
5404 (void)xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
5405 &prev);
5406 /*
5407 * Reading past eof, act as though there's a hole
5408 * up to end.
5409 */
5410 if (eof || got.br_startoff > bno) {
5411 *fsb = NULLFSBLOCK;
5412 return 0;
5413 }
5414 ASSERT(!ISNULLSTARTBLOCK(got.br_startblock));
5415 ASSERT(bno < got.br_startoff + got.br_blockcount);
5416 *fsb = got.br_startblock + (bno - got.br_startoff);
5417 ifp->if_lastex = lastx;
5418 return 0;
5419 }
5420
5421 /*
5422 * Unmap (remove) blocks from a file.
5423 * If nexts is nonzero then the number of extents to remove is limited to
5424 * that value. If not all extents in the block range can be removed then
5425 * *done is set.
5426 */
5427 int /* error */
5428 xfs_bunmapi(
5429 xfs_trans_t *tp, /* transaction pointer */
5430 struct xfs_inode *ip, /* incore inode */
5431 xfs_fileoff_t bno, /* starting offset to unmap */
5432 xfs_filblks_t len, /* length to unmap in file */
5433 int flags, /* misc flags */
5434 xfs_extnum_t nexts, /* number of extents max */
5435 xfs_fsblock_t *firstblock, /* first allocated block
5436 controls a.g. for allocs */
5437 xfs_bmap_free_t *flist, /* i/o: list extents to free */
5438 xfs_extdelta_t *delta, /* o: change made to incore
5439 extents */
5440 int *done) /* set if not done yet */
5441 {
5442 xfs_btree_cur_t *cur; /* bmap btree cursor */
5443 xfs_bmbt_irec_t del; /* extent being deleted */
5444 int eof; /* is deleting at eof */
5445 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
5446 int error; /* error return value */
5447 xfs_extnum_t extno; /* extent number in list */
5448 xfs_bmbt_irec_t got; /* current extent record */
5449 xfs_ifork_t *ifp; /* inode fork pointer */
5450 int isrt; /* freeing in rt area */
5451 xfs_extnum_t lastx; /* last extent index used */
5452 int logflags; /* transaction logging flags */
5453 xfs_extlen_t mod; /* rt extent offset */
5454 xfs_mount_t *mp; /* mount structure */
5455 xfs_extnum_t nextents; /* number of file extents */
5456 xfs_bmbt_irec_t prev; /* previous extent record */
5457 xfs_fileoff_t start; /* first file offset deleted */
5458 int tmp_logflags; /* partial logging flags */
5459 int wasdel; /* was a delayed alloc extent */
5460 int whichfork; /* data or attribute fork */
5461 int rsvd; /* OK to allocate reserved blocks */
5462 xfs_fsblock_t sum;
5463
5464 xfs_bunmap_trace(ip, bno, len, flags, (inst_t *)__return_address);
5465 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
5466 XFS_ATTR_FORK : XFS_DATA_FORK;
5467 ifp = XFS_IFORK_PTR(ip, whichfork);
5468 if (unlikely(
5469 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
5470 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
5471 XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW,
5472 ip->i_mount);
5473 return XFS_ERROR(EFSCORRUPTED);
5474 }
5475 mp = ip->i_mount;
5476 if (XFS_FORCED_SHUTDOWN(mp))
5477 return XFS_ERROR(EIO);
5478 rsvd = (flags & XFS_BMAPI_RSVBLOCKS) != 0;
5479 ASSERT(len > 0);
5480 ASSERT(nexts >= 0);
5481 ASSERT(ifp->if_ext_max ==
5482 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5483 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5484 (error = xfs_iread_extents(tp, ip, whichfork)))
5485 return error;
5486 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5487 if (nextents == 0) {
5488 *done = 1;
5489 return 0;
5490 }
5491 XFS_STATS_INC(xs_blk_unmap);
5492 isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
5493 start = bno;
5494 bno = start + len - 1;
5495 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
5496 &prev);
5497 if (delta) {
5498 delta->xed_startoff = NULLFILEOFF;
5499 delta->xed_blockcount = 0;
5500 }
5501 /*
5502 * Check to see if the given block number is past the end of the
5503 * file, back up to the last block if so...
5504 */
5505 if (eof) {
5506 ep = xfs_iext_get_ext(ifp, --lastx);
5507 xfs_bmbt_get_all(ep, &got);
5508 bno = got.br_startoff + got.br_blockcount - 1;
5509 }
5510 logflags = 0;
5511 if (ifp->if_flags & XFS_IFBROOT) {
5512 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
5513 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
5514 cur->bc_private.b.firstblock = *firstblock;
5515 cur->bc_private.b.flist = flist;
5516 cur->bc_private.b.flags = 0;
5517 } else
5518 cur = NULL;
5519 extno = 0;
5520 while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
5521 (nexts == 0 || extno < nexts)) {
5522 /*
5523 * Is the found extent after a hole in which bno lives?
5524 * Just back up to the previous extent, if so.
5525 */
5526 if (got.br_startoff > bno) {
5527 if (--lastx < 0)
5528 break;
5529 ep = xfs_iext_get_ext(ifp, lastx);
5530 xfs_bmbt_get_all(ep, &got);
5531 }
5532 /*
5533 * Is the last block of this extent before the range
5534 * we're supposed to delete? If so, we're done.
5535 */
5536 bno = XFS_FILEOFF_MIN(bno,
5537 got.br_startoff + got.br_blockcount - 1);
5538 if (bno < start)
5539 break;
5540 /*
5541 * Then deal with the (possibly delayed) allocated space
5542 * we found.
5543 */
5544 ASSERT(ep != NULL);
5545 del = got;
5546 wasdel = ISNULLSTARTBLOCK(del.br_startblock);
5547 if (got.br_startoff < start) {
5548 del.br_startoff = start;
5549 del.br_blockcount -= start - got.br_startoff;
5550 if (!wasdel)
5551 del.br_startblock += start - got.br_startoff;
5552 }
5553 if (del.br_startoff + del.br_blockcount > bno + 1)
5554 del.br_blockcount = bno + 1 - del.br_startoff;
5555 sum = del.br_startblock + del.br_blockcount;
5556 if (isrt &&
5557 (mod = do_mod(sum, mp->m_sb.sb_rextsize))) {
5558 /*
5559 * Realtime extent not lined up at the end.
5560 * The extent could have been split into written
5561 * and unwritten pieces, or we could just be
5562 * unmapping part of it. But we can't really
5563 * get rid of part of a realtime extent.
5564 */
5565 if (del.br_state == XFS_EXT_UNWRITTEN ||
5566 !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5567 /*
5568 * This piece is unwritten, or we're not
5569 * using unwritten extents. Skip over it.
5570 */
5571 ASSERT(bno >= mod);
5572 bno -= mod > del.br_blockcount ?
5573 del.br_blockcount : mod;
5574 if (bno < got.br_startoff) {
5575 if (--lastx >= 0)
5576 xfs_bmbt_get_all(xfs_iext_get_ext(
5577 ifp, lastx), &got);
5578 }
5579 continue;
5580 }
5581 /*
5582 * It's written, turn it unwritten.
5583 * This is better than zeroing it.
5584 */
5585 ASSERT(del.br_state == XFS_EXT_NORM);
5586 ASSERT(xfs_trans_get_block_res(tp) > 0);
5587 /*
5588 * If this spans a realtime extent boundary,
5589 * chop it back to the start of the one we end at.
5590 */
5591 if (del.br_blockcount > mod) {
5592 del.br_startoff += del.br_blockcount - mod;
5593 del.br_startblock += del.br_blockcount - mod;
5594 del.br_blockcount = mod;
5595 }
5596 del.br_state = XFS_EXT_UNWRITTEN;
5597 error = xfs_bmap_add_extent(ip, lastx, &cur, &del,
5598 firstblock, flist, &logflags, delta,
5599 XFS_DATA_FORK, 0);
5600 if (error)
5601 goto error0;
5602 goto nodelete;
5603 }
5604 if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) {
5605 /*
5606 * Realtime extent is lined up at the end but not
5607 * at the front. We'll get rid of full extents if
5608 * we can.
5609 */
5610 mod = mp->m_sb.sb_rextsize - mod;
5611 if (del.br_blockcount > mod) {
5612 del.br_blockcount -= mod;
5613 del.br_startoff += mod;
5614 del.br_startblock += mod;
5615 } else if ((del.br_startoff == start &&
5616 (del.br_state == XFS_EXT_UNWRITTEN ||
5617 xfs_trans_get_block_res(tp) == 0)) ||
5618 !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5619 /*
5620 * Can't make it unwritten. There isn't
5621 * a full extent here so just skip it.
5622 */
5623 ASSERT(bno >= del.br_blockcount);
5624 bno -= del.br_blockcount;
5625 if (bno < got.br_startoff) {
5626 if (--lastx >= 0)
5627 xfs_bmbt_get_all(--ep, &got);
5628 }
5629 continue;
5630 } else if (del.br_state == XFS_EXT_UNWRITTEN) {
5631 /*
5632 * This one is already unwritten.
5633 * It must have a written left neighbor.
5634 * Unwrite the killed part of that one and
5635 * try again.
5636 */
5637 ASSERT(lastx > 0);
5638 xfs_bmbt_get_all(xfs_iext_get_ext(ifp,
5639 lastx - 1), &prev);
5640 ASSERT(prev.br_state == XFS_EXT_NORM);
5641 ASSERT(!ISNULLSTARTBLOCK(prev.br_startblock));
5642 ASSERT(del.br_startblock ==
5643 prev.br_startblock + prev.br_blockcount);
5644 if (prev.br_startoff < start) {
5645 mod = start - prev.br_startoff;
5646 prev.br_blockcount -= mod;
5647 prev.br_startblock += mod;
5648 prev.br_startoff = start;
5649 }
5650 prev.br_state = XFS_EXT_UNWRITTEN;
5651 error = xfs_bmap_add_extent(ip, lastx - 1, &cur,
5652 &prev, firstblock, flist, &logflags,
5653 delta, XFS_DATA_FORK, 0);
5654 if (error)
5655 goto error0;
5656 goto nodelete;
5657 } else {
5658 ASSERT(del.br_state == XFS_EXT_NORM);
5659 del.br_state = XFS_EXT_UNWRITTEN;
5660 error = xfs_bmap_add_extent(ip, lastx, &cur,
5661 &del, firstblock, flist, &logflags,
5662 delta, XFS_DATA_FORK, 0);
5663 if (error)
5664 goto error0;
5665 goto nodelete;
5666 }
5667 }
5668 if (wasdel) {
5669 ASSERT(STARTBLOCKVAL(del.br_startblock) > 0);
5670 /* Update realtime/data freespace, unreserve quota */
5671 if (isrt) {
5672 xfs_filblks_t rtexts;
5673
5674 rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
5675 do_div(rtexts, mp->m_sb.sb_rextsize);
5676 xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
5677 (int64_t)rtexts, rsvd);
5678 (void)XFS_TRANS_RESERVE_QUOTA_NBLKS(mp,
5679 NULL, ip, -((long)del.br_blockcount), 0,
5680 XFS_QMOPT_RES_RTBLKS);
5681 } else {
5682 xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS,
5683 (int64_t)del.br_blockcount, rsvd);
5684 (void)XFS_TRANS_RESERVE_QUOTA_NBLKS(mp,
5685 NULL, ip, -((long)del.br_blockcount), 0,
5686 XFS_QMOPT_RES_REGBLKS);
5687 }
5688 ip->i_delayed_blks -= del.br_blockcount;
5689 if (cur)
5690 cur->bc_private.b.flags |=
5691 XFS_BTCUR_BPRV_WASDEL;
5692 } else if (cur)
5693 cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
5694 /*
5695 * If it's the case where the directory code is running
5696 * with no block reservation, and the deleted block is in
5697 * the middle of its extent, and the resulting insert
5698 * of an extent would cause transformation to btree format,
5699 * then reject it. The calling code will then swap
5700 * blocks around instead.
5701 * We have to do this now, rather than waiting for the
5702 * conversion to btree format, since the transaction
5703 * will be dirty.
5704 */
5705 if (!wasdel && xfs_trans_get_block_res(tp) == 0 &&
5706 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5707 XFS_IFORK_NEXTENTS(ip, whichfork) >= ifp->if_ext_max &&
5708 del.br_startoff > got.br_startoff &&
5709 del.br_startoff + del.br_blockcount <
5710 got.br_startoff + got.br_blockcount) {
5711 error = XFS_ERROR(ENOSPC);
5712 goto error0;
5713 }
5714 error = xfs_bmap_del_extent(ip, tp, lastx, flist, cur, &del,
5715 &tmp_logflags, delta, whichfork, rsvd);
5716 logflags |= tmp_logflags;
5717 if (error)
5718 goto error0;
5719 bno = del.br_startoff - 1;
5720 nodelete:
5721 lastx = ifp->if_lastex;
5722 /*
5723 * If not done go on to the next (previous) record.
5724 * Reset ep in case the extents array was re-alloced.
5725 */
5726 ep = xfs_iext_get_ext(ifp, lastx);
5727 if (bno != (xfs_fileoff_t)-1 && bno >= start) {
5728 if (lastx >= XFS_IFORK_NEXTENTS(ip, whichfork) ||
5729 xfs_bmbt_get_startoff(ep) > bno) {
5730 if (--lastx >= 0)
5731 ep = xfs_iext_get_ext(ifp, lastx);
5732 }
5733 if (lastx >= 0)
5734 xfs_bmbt_get_all(ep, &got);
5735 extno++;
5736 }
5737 }
5738 ifp->if_lastex = lastx;
5739 *done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0;
5740 ASSERT(ifp->if_ext_max ==
5741 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5742 /*
5743 * Convert to a btree if necessary.
5744 */
5745 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5746 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
5747 ASSERT(cur == NULL);
5748 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist,
5749 &cur, 0, &tmp_logflags, whichfork);
5750 logflags |= tmp_logflags;
5751 if (error)
5752 goto error0;
5753 }
5754 /*
5755 * transform from btree to extents, give it cur
5756 */
5757 else if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
5758 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
5759 ASSERT(cur != NULL);
5760 error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
5761 whichfork);
5762 logflags |= tmp_logflags;
5763 if (error)
5764 goto error0;
5765 }
5766 /*
5767 * transform from extents to local?
5768 */
5769 ASSERT(ifp->if_ext_max ==
5770 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5771 error = 0;
5772 if (delta && delta->xed_startoff != NULLFILEOFF) {
5773 /* A change was actually made.
5774 * Note that delta->xed_blockount is an offset at this
5775 * point and needs to be converted to a block count.
5776 */
5777 ASSERT(delta->xed_blockcount > delta->xed_startoff);
5778 delta->xed_blockcount -= delta->xed_startoff;
5779 }
5780 error0:
5781 /*
5782 * Log everything. Do this after conversion, there's no point in
5783 * logging the extent records if we've converted to btree format.
5784 */
5785 if ((logflags & XFS_ILOG_FEXT(whichfork)) &&
5786 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5787 logflags &= ~XFS_ILOG_FEXT(whichfork);
5788 else if ((logflags & XFS_ILOG_FBROOT(whichfork)) &&
5789 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5790 logflags &= ~XFS_ILOG_FBROOT(whichfork);
5791 /*
5792 * Log inode even in the error case, if the transaction
5793 * is dirty we'll need to shut down the filesystem.
5794 */
5795 if (logflags)
5796 xfs_trans_log_inode(tp, ip, logflags);
5797 if (cur) {
5798 if (!error) {
5799 *firstblock = cur->bc_private.b.firstblock;
5800 cur->bc_private.b.allocated = 0;
5801 }
5802 xfs_btree_del_cursor(cur,
5803 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5804 }
5805 return error;
5806 }
5807
5808 /*
5809 * returns 1 for success, 0 if we failed to map the extent.
5810 */
5811 STATIC int
5812 xfs_getbmapx_fix_eof_hole(
5813 xfs_inode_t *ip, /* xfs incore inode pointer */
5814 struct getbmapx *out, /* output structure */
5815 int prealloced, /* this is a file with
5816 * preallocated data space */
5817 __int64_t end, /* last block requested */
5818 xfs_fsblock_t startblock)
5819 {
5820 __int64_t fixlen;
5821 xfs_mount_t *mp; /* file system mount point */
5822 xfs_ifork_t *ifp; /* inode fork pointer */
5823 xfs_extnum_t lastx; /* last extent pointer */
5824 xfs_fileoff_t fileblock;
5825
5826 if (startblock == HOLESTARTBLOCK) {
5827 mp = ip->i_mount;
5828 out->bmv_block = -1;
5829 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, ip->i_size));
5830 fixlen -= out->bmv_offset;
5831 if (prealloced && out->bmv_offset + out->bmv_length == end) {
5832 /* Came to hole at EOF. Trim it. */
5833 if (fixlen <= 0)
5834 return 0;
5835 out->bmv_length = fixlen;
5836 }
5837 } else {
5838 if (startblock == DELAYSTARTBLOCK)
5839 out->bmv_block = -2;
5840 else
5841 out->bmv_block = XFS_FSB_TO_DB(ip, startblock);
5842 fileblock = XFS_BB_TO_FSB(ip->i_mount, out->bmv_offset);
5843 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
5844 if (xfs_iext_bno_to_ext(ifp, fileblock, &lastx) &&
5845 (lastx == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))-1))
5846 out->bmv_oflags |= BMV_OF_LAST;
5847 }
5848
5849 return 1;
5850 }
5851
5852 /*
5853 * Get inode's extents as described in bmv, and format for output.
5854 * Calls formatter to fill the user's buffer until all extents
5855 * are mapped, until the passed-in bmv->bmv_count slots have
5856 * been filled, or until the formatter short-circuits the loop,
5857 * if it is tracking filled-in extents on its own.
5858 */
5859 int /* error code */
5860 xfs_getbmap(
5861 xfs_inode_t *ip,
5862 struct getbmapx *bmv, /* user bmap structure */
5863 xfs_bmap_format_t formatter, /* format to user */
5864 void *arg) /* formatter arg */
5865 {
5866 __int64_t bmvend; /* last block requested */
5867 int error; /* return value */
5868 __int64_t fixlen; /* length for -1 case */
5869 int i; /* extent number */
5870 int lock; /* lock state */
5871 xfs_bmbt_irec_t *map; /* buffer for user's data */
5872 xfs_mount_t *mp; /* file system mount point */
5873 int nex; /* # of user extents can do */
5874 int nexleft; /* # of user extents left */
5875 int subnex; /* # of bmapi's can do */
5876 int nmap; /* number of map entries */
5877 struct getbmapx out; /* output structure */
5878 int whichfork; /* data or attr fork */
5879 int prealloced; /* this is a file with
5880 * preallocated data space */
5881 int iflags; /* interface flags */
5882 int bmapi_flags; /* flags for xfs_bmapi */
5883
5884 mp = ip->i_mount;
5885 iflags = bmv->bmv_iflags;
5886
5887 whichfork = iflags & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
5888
5889 /* If the BMV_IF_NO_DMAPI_READ interface bit specified, do not
5890 * generate a DMAPI read event. Otherwise, if the DM_EVENT_READ
5891 * bit is set for the file, generate a read event in order
5892 * that the DMAPI application may do its thing before we return
5893 * the extents. Usually this means restoring user file data to
5894 * regions of the file that look like holes.
5895 *
5896 * The "old behavior" (from XFS_IOC_GETBMAP) is to not specify
5897 * BMV_IF_NO_DMAPI_READ so that read events are generated.
5898 * If this were not true, callers of ioctl( XFS_IOC_GETBMAP )
5899 * could misinterpret holes in a DMAPI file as true holes,
5900 * when in fact they may represent offline user data.
5901 */
5902 if ((iflags & BMV_IF_NO_DMAPI_READ) == 0 &&
5903 DM_EVENT_ENABLED(ip, DM_EVENT_READ) &&
5904 whichfork == XFS_DATA_FORK) {
5905 error = XFS_SEND_DATA(mp, DM_EVENT_READ, ip, 0, 0, 0, NULL);
5906 if (error)
5907 return XFS_ERROR(error);
5908 }
5909
5910 if (whichfork == XFS_ATTR_FORK) {
5911 if (XFS_IFORK_Q(ip)) {
5912 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS &&
5913 ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE &&
5914 ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)
5915 return XFS_ERROR(EINVAL);
5916 } else if (unlikely(
5917 ip->i_d.di_aformat != 0 &&
5918 ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) {
5919 XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW,
5920 ip->i_mount);
5921 return XFS_ERROR(EFSCORRUPTED);
5922 }
5923 } else if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
5924 ip->i_d.di_format != XFS_DINODE_FMT_BTREE &&
5925 ip->i_d.di_format != XFS_DINODE_FMT_LOCAL)
5926 return XFS_ERROR(EINVAL);
5927 if (whichfork == XFS_DATA_FORK) {
5928 if (xfs_get_extsz_hint(ip) ||
5929 ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){
5930 prealloced = 1;
5931 fixlen = XFS_MAXIOFFSET(mp);
5932 } else {
5933 prealloced = 0;
5934 fixlen = ip->i_size;
5935 }
5936 } else {
5937 prealloced = 0;
5938 fixlen = 1LL << 32;
5939 }
5940
5941 if (bmv->bmv_length == -1) {
5942 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen));
5943 bmv->bmv_length = MAX( (__int64_t)(fixlen - bmv->bmv_offset),
5944 (__int64_t)0);
5945 } else if (bmv->bmv_length < 0)
5946 return XFS_ERROR(EINVAL);
5947 if (bmv->bmv_length == 0) {
5948 bmv->bmv_entries = 0;
5949 return 0;
5950 }
5951 nex = bmv->bmv_count - 1;
5952 if (nex <= 0)
5953 return XFS_ERROR(EINVAL);
5954 bmvend = bmv->bmv_offset + bmv->bmv_length;
5955
5956 xfs_ilock(ip, XFS_IOLOCK_SHARED);
5957
5958 if (((iflags & BMV_IF_DELALLOC) == 0) &&
5959 (whichfork == XFS_DATA_FORK) &&
5960 (ip->i_delayed_blks || ip->i_size > ip->i_d.di_size)) {
5961 /* xfs_fsize_t last_byte = xfs_file_last_byte(ip); */
5962 error = xfs_flush_pages(ip, (xfs_off_t)0,
5963 -1, 0, FI_REMAPF);
5964 if (error) {
5965 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
5966 return error;
5967 }
5968 }
5969
5970 ASSERT(whichfork == XFS_ATTR_FORK || (iflags & BMV_IF_DELALLOC) ||
5971 ip->i_delayed_blks == 0);
5972
5973 lock = xfs_ilock_map_shared(ip);
5974
5975 /*
5976 * Don't let nex be bigger than the number of extents
5977 * we can have assuming alternating holes and real extents.
5978 */
5979 if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1)
5980 nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1;
5981
5982 bmapi_flags = XFS_BMAPI_AFLAG(whichfork) |
5983 ((iflags & BMV_IF_PREALLOC) ? 0 : XFS_BMAPI_IGSTATE);
5984
5985 /*
5986 * Allocate enough space to handle "subnex" maps at a time.
5987 */
5988 subnex = 16;
5989 map = kmem_alloc(subnex * sizeof(*map), KM_SLEEP);
5990
5991 bmv->bmv_entries = 0;
5992
5993 if ((XFS_IFORK_NEXTENTS(ip, whichfork) == 0)) {
5994 if (((iflags & BMV_IF_DELALLOC) == 0) ||
5995 whichfork == XFS_ATTR_FORK) {
5996 error = 0;
5997 goto unlock_and_return;
5998 }
5999 }
6000
6001 nexleft = nex;
6002
6003 do {
6004 nmap = (nexleft > subnex) ? subnex : nexleft;
6005 error = xfs_bmapi(NULL, ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
6006 XFS_BB_TO_FSB(mp, bmv->bmv_length),
6007 bmapi_flags, NULL, 0, map, &nmap,
6008 NULL, NULL);
6009 if (error)
6010 goto unlock_and_return;
6011 ASSERT(nmap <= subnex);
6012
6013 for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
6014 out.bmv_oflags = 0;
6015 if (map[i].br_state == XFS_EXT_UNWRITTEN)
6016 out.bmv_oflags |= BMV_OF_PREALLOC;
6017 else if (map[i].br_startblock == DELAYSTARTBLOCK)
6018 out.bmv_oflags |= BMV_OF_DELALLOC;
6019 out.bmv_offset = XFS_FSB_TO_BB(mp, map[i].br_startoff);
6020 out.bmv_length = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
6021 out.bmv_unused1 = out.bmv_unused2 = 0;
6022 ASSERT(((iflags & BMV_IF_DELALLOC) != 0) ||
6023 (map[i].br_startblock != DELAYSTARTBLOCK));
6024 if (map[i].br_startblock == HOLESTARTBLOCK &&
6025 whichfork == XFS_ATTR_FORK) {
6026 /* came to the end of attribute fork */
6027 out.bmv_oflags |= BMV_OF_LAST;
6028 goto unlock_and_return;
6029 } else {
6030 int full = 0; /* user array is full */
6031
6032 if (!xfs_getbmapx_fix_eof_hole(ip, &out,
6033 prealloced, bmvend,
6034 map[i].br_startblock)) {
6035 goto unlock_and_return;
6036 }
6037
6038 /* format results & advance arg */
6039 error = formatter(&arg, &out, &full);
6040 if (error || full)
6041 goto unlock_and_return;
6042 nexleft--;
6043 bmv->bmv_offset =
6044 out.bmv_offset + out.bmv_length;
6045 bmv->bmv_length = MAX((__int64_t)0,
6046 (__int64_t)(bmvend - bmv->bmv_offset));
6047 bmv->bmv_entries++;
6048 }
6049 }
6050 } while (nmap && nexleft && bmv->bmv_length);
6051
6052 unlock_and_return:
6053 xfs_iunlock_map_shared(ip, lock);
6054 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
6055
6056 kmem_free(map);
6057
6058 return error;
6059 }
6060
6061 /*
6062 * Check the last inode extent to determine whether this allocation will result
6063 * in blocks being allocated at the end of the file. When we allocate new data
6064 * blocks at the end of the file which do not start at the previous data block,
6065 * we will try to align the new blocks at stripe unit boundaries.
6066 */
6067 STATIC int /* error */
6068 xfs_bmap_isaeof(
6069 xfs_inode_t *ip, /* incore inode pointer */
6070 xfs_fileoff_t off, /* file offset in fsblocks */
6071 int whichfork, /* data or attribute fork */
6072 char *aeof) /* return value */
6073 {
6074 int error; /* error return value */
6075 xfs_ifork_t *ifp; /* inode fork pointer */
6076 xfs_bmbt_rec_host_t *lastrec; /* extent record pointer */
6077 xfs_extnum_t nextents; /* number of file extents */
6078 xfs_bmbt_irec_t s; /* expanded extent record */
6079
6080 ASSERT(whichfork == XFS_DATA_FORK);
6081 ifp = XFS_IFORK_PTR(ip, whichfork);
6082 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
6083 (error = xfs_iread_extents(NULL, ip, whichfork)))
6084 return error;
6085 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
6086 if (nextents == 0) {
6087 *aeof = 1;
6088 return 0;
6089 }
6090 /*
6091 * Go to the last extent
6092 */
6093 lastrec = xfs_iext_get_ext(ifp, nextents - 1);
6094 xfs_bmbt_get_all(lastrec, &s);
6095 /*
6096 * Check we are allocating in the last extent (for delayed allocations)
6097 * or past the last extent for non-delayed allocations.
6098 */
6099 *aeof = (off >= s.br_startoff &&
6100 off < s.br_startoff + s.br_blockcount &&
6101 ISNULLSTARTBLOCK(s.br_startblock)) ||
6102 off >= s.br_startoff + s.br_blockcount;
6103 return 0;
6104 }
6105
6106 /*
6107 * Check if the endoff is outside the last extent. If so the caller will grow
6108 * the allocation to a stripe unit boundary.
6109 */
6110 int /* error */
6111 xfs_bmap_eof(
6112 xfs_inode_t *ip, /* incore inode pointer */
6113 xfs_fileoff_t endoff, /* file offset in fsblocks */
6114 int whichfork, /* data or attribute fork */
6115 int *eof) /* result value */
6116 {
6117 xfs_fsblock_t blockcount; /* extent block count */
6118 int error; /* error return value */
6119 xfs_ifork_t *ifp; /* inode fork pointer */
6120 xfs_bmbt_rec_host_t *lastrec; /* extent record pointer */
6121 xfs_extnum_t nextents; /* number of file extents */
6122 xfs_fileoff_t startoff; /* extent starting file offset */
6123
6124 ASSERT(whichfork == XFS_DATA_FORK);
6125 ifp = XFS_IFORK_PTR(ip, whichfork);
6126 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
6127 (error = xfs_iread_extents(NULL, ip, whichfork)))
6128 return error;
6129 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
6130 if (nextents == 0) {
6131 *eof = 1;
6132 return 0;
6133 }
6134 /*
6135 * Go to the last extent
6136 */
6137 lastrec = xfs_iext_get_ext(ifp, nextents - 1);
6138 startoff = xfs_bmbt_get_startoff(lastrec);
6139 blockcount = xfs_bmbt_get_blockcount(lastrec);
6140 *eof = endoff >= startoff + blockcount;
6141 return 0;
6142 }
6143
6144 #ifdef DEBUG
6145 STATIC
6146 xfs_buf_t *
6147 xfs_bmap_get_bp(
6148 xfs_btree_cur_t *cur,
6149 xfs_fsblock_t bno)
6150 {
6151 int i;
6152 xfs_buf_t *bp;
6153
6154 if (!cur)
6155 return(NULL);
6156
6157 bp = NULL;
6158 for(i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
6159 bp = cur->bc_bufs[i];
6160 if (!bp) break;
6161 if (XFS_BUF_ADDR(bp) == bno)
6162 break; /* Found it */
6163 }
6164 if (i == XFS_BTREE_MAXLEVELS)
6165 bp = NULL;
6166
6167 if (!bp) { /* Chase down all the log items to see if the bp is there */
6168 xfs_log_item_chunk_t *licp;
6169 xfs_trans_t *tp;
6170
6171 tp = cur->bc_tp;
6172 licp = &tp->t_items;
6173 while (!bp && licp != NULL) {
6174 if (xfs_lic_are_all_free(licp)) {
6175 licp = licp->lic_next;
6176 continue;
6177 }
6178 for (i = 0; i < licp->lic_unused; i++) {
6179 xfs_log_item_desc_t *lidp;
6180 xfs_log_item_t *lip;
6181 xfs_buf_log_item_t *bip;
6182 xfs_buf_t *lbp;
6183
6184 if (xfs_lic_isfree(licp, i)) {
6185 continue;
6186 }
6187
6188 lidp = xfs_lic_slot(licp, i);
6189 lip = lidp->lid_item;
6190 if (lip->li_type != XFS_LI_BUF)
6191 continue;
6192
6193 bip = (xfs_buf_log_item_t *)lip;
6194 lbp = bip->bli_buf;
6195
6196 if (XFS_BUF_ADDR(lbp) == bno) {
6197 bp = lbp;
6198 break; /* Found it */
6199 }
6200 }
6201 licp = licp->lic_next;
6202 }
6203 }
6204 return(bp);
6205 }
6206
6207 void
6208 xfs_check_block(
6209 struct xfs_btree_block *block,
6210 xfs_mount_t *mp,
6211 int root,
6212 short sz)
6213 {
6214 int i, j, dmxr;
6215 __be64 *pp, *thispa; /* pointer to block address */
6216 xfs_bmbt_key_t *prevp, *keyp;
6217
6218 ASSERT(be16_to_cpu(block->bb_level) > 0);
6219
6220 prevp = NULL;
6221 for( i = 1; i <= xfs_btree_get_numrecs(block); i++) {
6222 dmxr = mp->m_bmap_dmxr[0];
6223 keyp = XFS_BMBT_KEY_ADDR(mp, block, i);
6224
6225 if (prevp) {
6226 ASSERT(be64_to_cpu(prevp->br_startoff) <
6227 be64_to_cpu(keyp->br_startoff));
6228 }
6229 prevp = keyp;
6230
6231 /*
6232 * Compare the block numbers to see if there are dups.
6233 */
6234 if (root)
6235 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, i, sz);
6236 else
6237 pp = XFS_BMBT_PTR_ADDR(mp, block, i, dmxr);
6238
6239 for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
6240 if (root)
6241 thispa = XFS_BMAP_BROOT_PTR_ADDR(mp, block, j, sz);
6242 else
6243 thispa = XFS_BMBT_PTR_ADDR(mp, block, j, dmxr);
6244 if (*thispa == *pp) {
6245 cmn_err(CE_WARN, "%s: thispa(%d) == pp(%d) %Ld",
6246 __func__, j, i,
6247 (unsigned long long)be64_to_cpu(*thispa));
6248 panic("%s: ptrs are equal in node\n",
6249 __func__);
6250 }
6251 }
6252 }
6253 }
6254
6255 /*
6256 * Check that the extents for the inode ip are in the right order in all
6257 * btree leaves.
6258 */
6259
6260 STATIC void
6261 xfs_bmap_check_leaf_extents(
6262 xfs_btree_cur_t *cur, /* btree cursor or null */
6263 xfs_inode_t *ip, /* incore inode pointer */
6264 int whichfork) /* data or attr fork */
6265 {
6266 struct xfs_btree_block *block; /* current btree block */
6267 xfs_fsblock_t bno; /* block # of "block" */
6268 xfs_buf_t *bp; /* buffer for "block" */
6269 int error; /* error return value */
6270 xfs_extnum_t i=0, j; /* index into the extents list */
6271 xfs_ifork_t *ifp; /* fork structure */
6272 int level; /* btree level, for checking */
6273 xfs_mount_t *mp; /* file system mount structure */
6274 __be64 *pp; /* pointer to block address */
6275 xfs_bmbt_rec_t *ep; /* pointer to current extent */
6276 xfs_bmbt_rec_t last = {0, 0}; /* last extent in prev block */
6277 xfs_bmbt_rec_t *nextp; /* pointer to next extent */
6278 int bp_release = 0;
6279
6280 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
6281 return;
6282 }
6283
6284 bno = NULLFSBLOCK;
6285 mp = ip->i_mount;
6286 ifp = XFS_IFORK_PTR(ip, whichfork);
6287 block = ifp->if_broot;
6288 /*
6289 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
6290 */
6291 level = be16_to_cpu(block->bb_level);
6292 ASSERT(level > 0);
6293 xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
6294 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
6295 bno = be64_to_cpu(*pp);
6296
6297 ASSERT(bno != NULLDFSBNO);
6298 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
6299 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
6300
6301 /*
6302 * Go down the tree until leaf level is reached, following the first
6303 * pointer (leftmost) at each level.
6304 */
6305 while (level-- > 0) {
6306 /* See if buf is in cur first */
6307 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
6308 if (bp) {
6309 bp_release = 0;
6310 } else {
6311 bp_release = 1;
6312 }
6313 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
6314 XFS_BMAP_BTREE_REF)))
6315 goto error_norelse;
6316 block = XFS_BUF_TO_BLOCK(bp);
6317 XFS_WANT_CORRUPTED_GOTO(
6318 xfs_bmap_sanity_check(mp, bp, level),
6319 error0);
6320 if (level == 0)
6321 break;
6322
6323 /*
6324 * Check this block for basic sanity (increasing keys and
6325 * no duplicate blocks).
6326 */
6327
6328 xfs_check_block(block, mp, 0, 0);
6329 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
6330 bno = be64_to_cpu(*pp);
6331 XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
6332 if (bp_release) {
6333 bp_release = 0;
6334 xfs_trans_brelse(NULL, bp);
6335 }
6336 }
6337
6338 /*
6339 * Here with bp and block set to the leftmost leaf node in the tree.
6340 */
6341 i = 0;
6342
6343 /*
6344 * Loop over all leaf nodes checking that all extents are in the right order.
6345 */
6346 for (;;) {
6347 xfs_fsblock_t nextbno;
6348 xfs_extnum_t num_recs;
6349
6350
6351 num_recs = xfs_btree_get_numrecs(block);
6352
6353 /*
6354 * Read-ahead the next leaf block, if any.
6355 */
6356
6357 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
6358
6359 /*
6360 * Check all the extents to make sure they are OK.
6361 * If we had a previous block, the last entry should
6362 * conform with the first entry in this one.
6363 */
6364
6365 ep = XFS_BMBT_REC_ADDR(mp, block, 1);
6366 if (i) {
6367 ASSERT(xfs_bmbt_disk_get_startoff(&last) +
6368 xfs_bmbt_disk_get_blockcount(&last) <=
6369 xfs_bmbt_disk_get_startoff(ep));
6370 }
6371 for (j = 1; j < num_recs; j++) {
6372 nextp = XFS_BMBT_REC_ADDR(mp, block, j + 1);
6373 ASSERT(xfs_bmbt_disk_get_startoff(ep) +
6374 xfs_bmbt_disk_get_blockcount(ep) <=
6375 xfs_bmbt_disk_get_startoff(nextp));
6376 ep = nextp;
6377 }
6378
6379 last = *ep;
6380 i += num_recs;
6381 if (bp_release) {
6382 bp_release = 0;
6383 xfs_trans_brelse(NULL, bp);
6384 }
6385 bno = nextbno;
6386 /*
6387 * If we've reached the end, stop.
6388 */
6389 if (bno == NULLFSBLOCK)
6390 break;
6391
6392 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
6393 if (bp) {
6394 bp_release = 0;
6395 } else {
6396 bp_release = 1;
6397 }
6398 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
6399 XFS_BMAP_BTREE_REF)))
6400 goto error_norelse;
6401 block = XFS_BUF_TO_BLOCK(bp);
6402 }
6403 if (bp_release) {
6404 bp_release = 0;
6405 xfs_trans_brelse(NULL, bp);
6406 }
6407 return;
6408
6409 error0:
6410 cmn_err(CE_WARN, "%s: at error0", __func__);
6411 if (bp_release)
6412 xfs_trans_brelse(NULL, bp);
6413 error_norelse:
6414 cmn_err(CE_WARN, "%s: BAD after btree leaves for %d extents",
6415 __func__, i);
6416 panic("%s: CORRUPTED BTREE OR SOMETHING", __func__);
6417 return;
6418 }
6419 #endif
6420
6421 /*
6422 * Count fsblocks of the given fork.
6423 */
6424 int /* error */
6425 xfs_bmap_count_blocks(
6426 xfs_trans_t *tp, /* transaction pointer */
6427 xfs_inode_t *ip, /* incore inode */
6428 int whichfork, /* data or attr fork */
6429 int *count) /* out: count of blocks */
6430 {
6431 struct xfs_btree_block *block; /* current btree block */
6432 xfs_fsblock_t bno; /* block # of "block" */
6433 xfs_ifork_t *ifp; /* fork structure */
6434 int level; /* btree level, for checking */
6435 xfs_mount_t *mp; /* file system mount structure */
6436 __be64 *pp; /* pointer to block address */
6437
6438 bno = NULLFSBLOCK;
6439 mp = ip->i_mount;
6440 ifp = XFS_IFORK_PTR(ip, whichfork);
6441 if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) {
6442 xfs_bmap_count_leaves(ifp, 0,
6443 ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t),
6444 count);
6445 return 0;
6446 }
6447
6448 /*
6449 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
6450 */
6451 block = ifp->if_broot;
6452 level = be16_to_cpu(block->bb_level);
6453 ASSERT(level > 0);
6454 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
6455 bno = be64_to_cpu(*pp);
6456 ASSERT(bno != NULLDFSBNO);
6457 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
6458 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
6459
6460 if (unlikely(xfs_bmap_count_tree(mp, tp, ifp, bno, level, count) < 0)) {
6461 XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW,
6462 mp);
6463 return XFS_ERROR(EFSCORRUPTED);
6464 }
6465
6466 return 0;
6467 }
6468
6469 /*
6470 * Recursively walks each level of a btree
6471 * to count total fsblocks is use.
6472 */
6473 STATIC int /* error */
6474 xfs_bmap_count_tree(
6475 xfs_mount_t *mp, /* file system mount point */
6476 xfs_trans_t *tp, /* transaction pointer */
6477 xfs_ifork_t *ifp, /* inode fork pointer */
6478 xfs_fsblock_t blockno, /* file system block number */
6479 int levelin, /* level in btree */
6480 int *count) /* Count of blocks */
6481 {
6482 int error;
6483 xfs_buf_t *bp, *nbp;
6484 int level = levelin;
6485 __be64 *pp;
6486 xfs_fsblock_t bno = blockno;
6487 xfs_fsblock_t nextbno;
6488 struct xfs_btree_block *block, *nextblock;
6489 int numrecs;
6490
6491 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF)))
6492 return error;
6493 *count += 1;
6494 block = XFS_BUF_TO_BLOCK(bp);
6495
6496 if (--level) {
6497 /* Not at node above leafs, count this level of nodes */
6498 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
6499 while (nextbno != NULLFSBLOCK) {
6500 if ((error = xfs_btree_read_bufl(mp, tp, nextbno,
6501 0, &nbp, XFS_BMAP_BTREE_REF)))
6502 return error;
6503 *count += 1;
6504 nextblock = XFS_BUF_TO_BLOCK(nbp);
6505 nextbno = be64_to_cpu(nextblock->bb_u.l.bb_rightsib);
6506 xfs_trans_brelse(tp, nbp);
6507 }
6508
6509 /* Dive to the next level */
6510 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
6511 bno = be64_to_cpu(*pp);
6512 if (unlikely((error =
6513 xfs_bmap_count_tree(mp, tp, ifp, bno, level, count)) < 0)) {
6514 xfs_trans_brelse(tp, bp);
6515 XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
6516 XFS_ERRLEVEL_LOW, mp);
6517 return XFS_ERROR(EFSCORRUPTED);
6518 }
6519 xfs_trans_brelse(tp, bp);
6520 } else {
6521 /* count all level 1 nodes and their leaves */
6522 for (;;) {
6523 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
6524 numrecs = be16_to_cpu(block->bb_numrecs);
6525 xfs_bmap_disk_count_leaves(mp, block, numrecs, count);
6526 xfs_trans_brelse(tp, bp);
6527 if (nextbno == NULLFSBLOCK)
6528 break;
6529 bno = nextbno;
6530 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
6531 XFS_BMAP_BTREE_REF)))
6532 return error;
6533 *count += 1;
6534 block = XFS_BUF_TO_BLOCK(bp);
6535 }
6536 }
6537 return 0;
6538 }
6539
6540 /*
6541 * Count leaf blocks given a range of extent records.
6542 */
6543 STATIC void
6544 xfs_bmap_count_leaves(
6545 xfs_ifork_t *ifp,
6546 xfs_extnum_t idx,
6547 int numrecs,
6548 int *count)
6549 {
6550 int b;
6551
6552 for (b = 0; b < numrecs; b++) {
6553 xfs_bmbt_rec_host_t *frp = xfs_iext_get_ext(ifp, idx + b);
6554 *count += xfs_bmbt_get_blockcount(frp);
6555 }
6556 }
6557
6558 /*
6559 * Count leaf blocks given a range of extent records originally
6560 * in btree format.
6561 */
6562 STATIC void
6563 xfs_bmap_disk_count_leaves(
6564 struct xfs_mount *mp,
6565 struct xfs_btree_block *block,
6566 int numrecs,
6567 int *count)
6568 {
6569 int b;
6570 xfs_bmbt_rec_t *frp;
6571
6572 for (b = 1; b <= numrecs; b++) {
6573 frp = XFS_BMBT_REC_ADDR(mp, block, b);
6574 *count += xfs_bmbt_disk_get_blockcount(frp);
6575 }
6576 }
kernel source for telekom puls (alcatel/mediatek)