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fed up with those stupid warnings
[mmotm.git] / fs / xfs / xfs_ialloc.c
blobab64f3efb43b3a375bf690b7ade11726db94bdc2
1 /*
2 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_inum.h"
24 #include "xfs_trans.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_dir2.h"
28 #include "xfs_dmapi.h"
29 #include "xfs_mount.h"
30 #include "xfs_bmap_btree.h"
31 #include "xfs_alloc_btree.h"
32 #include "xfs_ialloc_btree.h"
33 #include "xfs_dir2_sf.h"
34 #include "xfs_attr_sf.h"
35 #include "xfs_dinode.h"
36 #include "xfs_inode.h"
37 #include "xfs_btree.h"
38 #include "xfs_ialloc.h"
39 #include "xfs_alloc.h"
40 #include "xfs_rtalloc.h"
41 #include "xfs_error.h"
42 #include "xfs_bmap.h"
43
44
45 /*
46 * Allocation group level functions.
47 */
48 static inline int
49 xfs_ialloc_cluster_alignment(
50 xfs_alloc_arg_t *args)
51 {
52 if (xfs_sb_version_hasalign(&args->mp->m_sb) &&
53 args->mp->m_sb.sb_inoalignmt >=
54 XFS_B_TO_FSBT(args->mp, XFS_INODE_CLUSTER_SIZE(args->mp)))
55 return args->mp->m_sb.sb_inoalignmt;
56 return 1;
57 }
58
59 /*
60 * Lookup a record by ino in the btree given by cur.
61 */
62 int /* error */
63 xfs_inobt_lookup(
64 struct xfs_btree_cur *cur, /* btree cursor */
65 xfs_agino_t ino, /* starting inode of chunk */
66 xfs_lookup_t dir, /* <=, >=, == */
67 int *stat) /* success/failure */
68 {
69 cur->bc_rec.i.ir_startino = ino;
70 cur->bc_rec.i.ir_freecount = 0;
71 cur->bc_rec.i.ir_free = 0;
72 return xfs_btree_lookup(cur, dir, stat);
73 }
74
75 /*
76 * Update the record referred to by cur to the value given.
77 * This either works (return 0) or gets an EFSCORRUPTED error.
78 */
79 STATIC int /* error */
80 xfs_inobt_update(
81 struct xfs_btree_cur *cur, /* btree cursor */
82 xfs_inobt_rec_incore_t *irec) /* btree record */
83 {
84 union xfs_btree_rec rec;
85
86 rec.inobt.ir_startino = cpu_to_be32(irec->ir_startino);
87 rec.inobt.ir_freecount = cpu_to_be32(irec->ir_freecount);
88 rec.inobt.ir_free = cpu_to_be64(irec->ir_free);
89 return xfs_btree_update(cur, &rec);
90 }
91
92 /*
93 * Get the data from the pointed-to record.
94 */
95 int /* error */
96 xfs_inobt_get_rec(
97 struct xfs_btree_cur *cur, /* btree cursor */
98 xfs_inobt_rec_incore_t *irec, /* btree record */
99 int *stat) /* output: success/failure */
100 {
101 union xfs_btree_rec *rec;
102 int error;
103
104 error = xfs_btree_get_rec(cur, &rec, stat);
105 if (!error && *stat == 1) {
106 irec->ir_startino = be32_to_cpu(rec->inobt.ir_startino);
107 irec->ir_freecount = be32_to_cpu(rec->inobt.ir_freecount);
108 irec->ir_free = be64_to_cpu(rec->inobt.ir_free);
109 }
110 return error;
111 }
112
113 /*
114 * Verify that the number of free inodes in the AGI is correct.
115 */
116 #ifdef DEBUG
117 STATIC int
118 xfs_check_agi_freecount(
119 struct xfs_btree_cur *cur,
120 struct xfs_agi *agi)
121 {
122 if (cur->bc_nlevels == 1) {
123 xfs_inobt_rec_incore_t rec;
124 int freecount = 0;
125 int error;
126 int i;
127
128 error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &i);
129 if (error)
130 return error;
131
132 do {
133 error = xfs_inobt_get_rec(cur, &rec, &i);
134 if (error)
135 return error;
136
137 if (i) {
138 freecount += rec.ir_freecount;
139 error = xfs_btree_increment(cur, 0, &i);
140 if (error)
141 return error;
142 }
143 } while (i == 1);
144
145 if (!XFS_FORCED_SHUTDOWN(cur->bc_mp))
146 ASSERT(freecount == be32_to_cpu(agi->agi_freecount));
147 }
148 return 0;
149 }
150 #else
151 #define xfs_check_agi_freecount(cur, agi) 0
152 #endif
153
154 /*
155 * Initialise a new set of inodes.
156 */
157 STATIC void
158 xfs_ialloc_inode_init(
159 struct xfs_mount *mp,
160 struct xfs_trans *tp,
161 xfs_agnumber_t agno,
162 xfs_agblock_t agbno,
163 xfs_agblock_t length,
164 unsigned int gen)
165 {
166 struct xfs_buf *fbuf;
167 struct xfs_dinode *free;
168 int blks_per_cluster, nbufs, ninodes;
169 int version;
170 int i, j;
171 xfs_daddr_t d;
172
173 /*
174 * Loop over the new block(s), filling in the inodes.
175 * For small block sizes, manipulate the inodes in buffers
176 * which are multiples of the blocks size.
177 */
178 if (mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp)) {
179 blks_per_cluster = 1;
180 nbufs = length;
181 ninodes = mp->m_sb.sb_inopblock;
182 } else {
183 blks_per_cluster = XFS_INODE_CLUSTER_SIZE(mp) /
184 mp->m_sb.sb_blocksize;
185 nbufs = length / blks_per_cluster;
186 ninodes = blks_per_cluster * mp->m_sb.sb_inopblock;
187 }
188
189 /*
190 * Figure out what version number to use in the inodes we create.
191 * If the superblock version has caught up to the one that supports
192 * the new inode format, then use the new inode version. Otherwise
193 * use the old version so that old kernels will continue to be
194 * able to use the file system.
195 */
196 if (xfs_sb_version_hasnlink(&mp->m_sb))
197 version = 2;
198 else
199 version = 1;
200
201 for (j = 0; j < nbufs; j++) {
202 /*
203 * Get the block.
204 */
205 d = XFS_AGB_TO_DADDR(mp, agno, agbno + (j * blks_per_cluster));
206 fbuf = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
207 mp->m_bsize * blks_per_cluster,
208 XFS_BUF_LOCK);
209 ASSERT(fbuf);
210 ASSERT(!XFS_BUF_GETERROR(fbuf));
211
212 /*
213 * Initialize all inodes in this buffer and then log them.
214 *
215 * XXX: It would be much better if we had just one transaction
216 * to log a whole cluster of inodes instead of all the
217 * individual transactions causing a lot of log traffic.
218 */
219 xfs_biozero(fbuf, 0, ninodes << mp->m_sb.sb_inodelog);
220 for (i = 0; i < ninodes; i++) {
221 int ioffset = i << mp->m_sb.sb_inodelog;
222 uint isize = sizeof(struct xfs_dinode);
223
224 free = xfs_make_iptr(mp, fbuf, i);
225 free->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
226 free->di_version = version;
227 free->di_gen = cpu_to_be32(gen);
228 free->di_next_unlinked = cpu_to_be32(NULLAGINO);
229 xfs_trans_log_buf(tp, fbuf, ioffset, ioffset + isize - 1);
230 }
231 xfs_trans_inode_alloc_buf(tp, fbuf);
232 }
233 }
234
235 /*
236 * Allocate new inodes in the allocation group specified by agbp.
237 * Return 0 for success, else error code.
238 */
239 STATIC int /* error code or 0 */
240 xfs_ialloc_ag_alloc(
241 xfs_trans_t *tp, /* transaction pointer */
242 xfs_buf_t *agbp, /* alloc group buffer */
243 int *alloc)
244 {
245 xfs_agi_t *agi; /* allocation group header */
246 xfs_alloc_arg_t args; /* allocation argument structure */
247 xfs_btree_cur_t *cur; /* inode btree cursor */
248 xfs_agnumber_t agno;
249 int error;
250 int i;
251 xfs_agino_t newino; /* new first inode's number */
252 xfs_agino_t newlen; /* new number of inodes */
253 xfs_agino_t thisino; /* current inode number, for loop */
254 int isaligned = 0; /* inode allocation at stripe unit */
255 /* boundary */
256
257 args.tp = tp;
258 args.mp = tp->t_mountp;
259
260 /*
261 * Locking will ensure that we don't have two callers in here
262 * at one time.
263 */
264 newlen = XFS_IALLOC_INODES(args.mp);
265 if (args.mp->m_maxicount &&
266 args.mp->m_sb.sb_icount + newlen > args.mp->m_maxicount)
267 return XFS_ERROR(ENOSPC);
268 args.minlen = args.maxlen = XFS_IALLOC_BLOCKS(args.mp);
269 /*
270 * First try to allocate inodes contiguous with the last-allocated
271 * chunk of inodes. If the filesystem is striped, this will fill
272 * an entire stripe unit with inodes.
273 */
274 agi = XFS_BUF_TO_AGI(agbp);
275 newino = be32_to_cpu(agi->agi_newino);
276 agno = be32_to_cpu(agi->agi_seqno);
277 args.agbno = XFS_AGINO_TO_AGBNO(args.mp, newino) +
278 XFS_IALLOC_BLOCKS(args.mp);
279 if (likely(newino != NULLAGINO &&
280 (args.agbno < be32_to_cpu(agi->agi_length)))) {
281 args.fsbno = XFS_AGB_TO_FSB(args.mp, agno, args.agbno);
282 args.type = XFS_ALLOCTYPE_THIS_BNO;
283 args.mod = args.total = args.wasdel = args.isfl =
284 args.userdata = args.minalignslop = 0;
285 args.prod = 1;
286
287 /*
288 * We need to take into account alignment here to ensure that
289 * we don't modify the free list if we fail to have an exact
290 * block. If we don't have an exact match, and every oher
291 * attempt allocation attempt fails, we'll end up cancelling
292 * a dirty transaction and shutting down.
293 *
294 * For an exact allocation, alignment must be 1,
295 * however we need to take cluster alignment into account when
296 * fixing up the freelist. Use the minalignslop field to
297 * indicate that extra blocks might be required for alignment,
298 * but not to use them in the actual exact allocation.
299 */
300 args.alignment = 1;
301 args.minalignslop = xfs_ialloc_cluster_alignment(&args) - 1;
302
303 /* Allow space for the inode btree to split. */
304 args.minleft = args.mp->m_in_maxlevels - 1;
305 if ((error = xfs_alloc_vextent(&args)))
306 return error;
307 } else
308 args.fsbno = NULLFSBLOCK;
309
310 if (unlikely(args.fsbno == NULLFSBLOCK)) {
311 /*
312 * Set the alignment for the allocation.
313 * If stripe alignment is turned on then align at stripe unit
314 * boundary.
315 * If the cluster size is smaller than a filesystem block
316 * then we're doing I/O for inodes in filesystem block size
317 * pieces, so don't need alignment anyway.
318 */
319 isaligned = 0;
320 if (args.mp->m_sinoalign) {
321 ASSERT(!(args.mp->m_flags & XFS_MOUNT_NOALIGN));
322 args.alignment = args.mp->m_dalign;
323 isaligned = 1;
324 } else
325 args.alignment = xfs_ialloc_cluster_alignment(&args);
326 /*
327 * Need to figure out where to allocate the inode blocks.
328 * Ideally they should be spaced out through the a.g.
329 * For now, just allocate blocks up front.
330 */
331 args.agbno = be32_to_cpu(agi->agi_root);
332 args.fsbno = XFS_AGB_TO_FSB(args.mp, agno, args.agbno);
333 /*
334 * Allocate a fixed-size extent of inodes.
335 */
336 args.type = XFS_ALLOCTYPE_NEAR_BNO;
337 args.mod = args.total = args.wasdel = args.isfl =
338 args.userdata = args.minalignslop = 0;
339 args.prod = 1;
340 /*
341 * Allow space for the inode btree to split.
342 */
343 args.minleft = args.mp->m_in_maxlevels - 1;
344 if ((error = xfs_alloc_vextent(&args)))
345 return error;
346 }
347
348 /*
349 * If stripe alignment is turned on, then try again with cluster
350 * alignment.
351 */
352 if (isaligned && args.fsbno == NULLFSBLOCK) {
353 args.type = XFS_ALLOCTYPE_NEAR_BNO;
354 args.agbno = be32_to_cpu(agi->agi_root);
355 args.fsbno = XFS_AGB_TO_FSB(args.mp, agno, args.agbno);
356 args.alignment = xfs_ialloc_cluster_alignment(&args);
357 if ((error = xfs_alloc_vextent(&args)))
358 return error;
359 }
360
361 if (args.fsbno == NULLFSBLOCK) {
362 *alloc = 0;
363 return 0;
364 }
365 ASSERT(args.len == args.minlen);
366
367 /*
368 * Stamp and write the inode buffers.
369 *
370 * Seed the new inode cluster with a random generation number. This
371 * prevents short-term reuse of generation numbers if a chunk is
372 * freed and then immediately reallocated. We use random numbers
373 * rather than a linear progression to prevent the next generation
374 * number from being easily guessable.
375 */
376 xfs_ialloc_inode_init(args.mp, tp, agno, args.agbno, args.len,
377 random32());
378
379 /*
380 * Convert the results.
381 */
382 newino = XFS_OFFBNO_TO_AGINO(args.mp, args.agbno, 0);
383 be32_add_cpu(&agi->agi_count, newlen);
384 be32_add_cpu(&agi->agi_freecount, newlen);
385 down_read(&args.mp->m_peraglock);
386 args.mp->m_perag[agno].pagi_freecount += newlen;
387 up_read(&args.mp->m_peraglock);
388 agi->agi_newino = cpu_to_be32(newino);
389
390 /*
391 * Insert records describing the new inode chunk into the btree.
392 */
393 cur = xfs_inobt_init_cursor(args.mp, tp, agbp, agno);
394 for (thisino = newino;
395 thisino < newino + newlen;
396 thisino += XFS_INODES_PER_CHUNK) {
397 cur->bc_rec.i.ir_startino = thisino;
398 cur->bc_rec.i.ir_freecount = XFS_INODES_PER_CHUNK;
399 cur->bc_rec.i.ir_free = XFS_INOBT_ALL_FREE;
400 error = xfs_btree_lookup(cur, XFS_LOOKUP_EQ, &i);
401 if (error) {
402 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
403 return error;
404 }
405 ASSERT(i == 0);
406 error = xfs_btree_insert(cur, &i);
407 if (error) {
408 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
409 return error;
410 }
411 ASSERT(i == 1);
412 }
413 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
414 /*
415 * Log allocation group header fields
416 */
417 xfs_ialloc_log_agi(tp, agbp,
418 XFS_AGI_COUNT | XFS_AGI_FREECOUNT | XFS_AGI_NEWINO);
419 /*
420 * Modify/log superblock values for inode count and inode free count.
421 */
422 xfs_trans_mod_sb(tp, XFS_TRANS_SB_ICOUNT, (long)newlen);
423 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, (long)newlen);
424 *alloc = 1;
425 return 0;
426 }
427
428 STATIC_INLINE xfs_agnumber_t
429 xfs_ialloc_next_ag(
430 xfs_mount_t *mp)
431 {
432 xfs_agnumber_t agno;
433
434 spin_lock(&mp->m_agirotor_lock);
435 agno = mp->m_agirotor;
436 if (++mp->m_agirotor == mp->m_maxagi)
437 mp->m_agirotor = 0;
438 spin_unlock(&mp->m_agirotor_lock);
439
440 return agno;
441 }
442
443 /*
444 * Select an allocation group to look for a free inode in, based on the parent
445 * inode and then mode. Return the allocation group buffer.
446 */
447 STATIC xfs_buf_t * /* allocation group buffer */
448 xfs_ialloc_ag_select(
449 xfs_trans_t *tp, /* transaction pointer */
450 xfs_ino_t parent, /* parent directory inode number */
451 mode_t mode, /* bits set to indicate file type */
452 int okalloc) /* ok to allocate more space */
453 {
454 xfs_buf_t *agbp; /* allocation group header buffer */
455 xfs_agnumber_t agcount; /* number of ag's in the filesystem */
456 xfs_agnumber_t agno; /* current ag number */
457 int flags; /* alloc buffer locking flags */
458 xfs_extlen_t ineed; /* blocks needed for inode allocation */
459 xfs_extlen_t longest = 0; /* longest extent available */
460 xfs_mount_t *mp; /* mount point structure */
461 int needspace; /* file mode implies space allocated */
462 xfs_perag_t *pag; /* per allocation group data */
463 xfs_agnumber_t pagno; /* parent (starting) ag number */
464
465 /*
466 * Files of these types need at least one block if length > 0
467 * (and they won't fit in the inode, but that's hard to figure out).
468 */
469 needspace = S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode);
470 mp = tp->t_mountp;
471 agcount = mp->m_maxagi;
472 if (S_ISDIR(mode))
473 pagno = xfs_ialloc_next_ag(mp);
474 else {
475 pagno = XFS_INO_TO_AGNO(mp, parent);
476 if (pagno >= agcount)
477 pagno = 0;
478 }
479 ASSERT(pagno < agcount);
480 /*
481 * Loop through allocation groups, looking for one with a little
482 * free space in it. Note we don't look for free inodes, exactly.
483 * Instead, we include whether there is a need to allocate inodes
484 * to mean that blocks must be allocated for them,
485 * if none are currently free.
486 */
487 agno = pagno;
488 flags = XFS_ALLOC_FLAG_TRYLOCK;
489 down_read(&mp->m_peraglock);
490 for (;;) {
491 pag = &mp->m_perag[agno];
492 if (!pag->pagi_init) {
493 if (xfs_ialloc_read_agi(mp, tp, agno, &agbp)) {
494 agbp = NULL;
495 goto nextag;
496 }
497 } else
498 agbp = NULL;
499
500 if (!pag->pagi_inodeok) {
501 xfs_ialloc_next_ag(mp);
502 goto unlock_nextag;
503 }
504
505 /*
506 * Is there enough free space for the file plus a block
507 * of inodes (if we need to allocate some)?
508 */
509 ineed = pag->pagi_freecount ? 0 : XFS_IALLOC_BLOCKS(mp);
510 if (ineed && !pag->pagf_init) {
511 if (agbp == NULL &&
512 xfs_ialloc_read_agi(mp, tp, agno, &agbp)) {
513 agbp = NULL;
514 goto nextag;
515 }
516 (void)xfs_alloc_pagf_init(mp, tp, agno, flags);
517 }
518 if (!ineed || pag->pagf_init) {
519 if (ineed && !(longest = pag->pagf_longest))
520 longest = pag->pagf_flcount > 0;
521 if (!ineed ||
522 (pag->pagf_freeblks >= needspace + ineed &&
523 longest >= ineed &&
524 okalloc)) {
525 if (agbp == NULL &&
526 xfs_ialloc_read_agi(mp, tp, agno, &agbp)) {
527 agbp = NULL;
528 goto nextag;
529 }
530 up_read(&mp->m_peraglock);
531 return agbp;
532 }
533 }
534 unlock_nextag:
535 if (agbp)
536 xfs_trans_brelse(tp, agbp);
537 nextag:
538 /*
539 * No point in iterating over the rest, if we're shutting
540 * down.
541 */
542 if (XFS_FORCED_SHUTDOWN(mp)) {
543 up_read(&mp->m_peraglock);
544 return NULL;
545 }
546 agno++;
547 if (agno >= agcount)
548 agno = 0;
549 if (agno == pagno) {
550 if (flags == 0) {
551 up_read(&mp->m_peraglock);
552 return NULL;
553 }
554 flags = 0;
555 }
556 }
557 }
558
559 /*
560 * Try to retrieve the next record to the left/right from the current one.
561 */
562 STATIC int
563 xfs_ialloc_next_rec(
564 struct xfs_btree_cur *cur,
565 xfs_inobt_rec_incore_t *rec,
566 int *done,
567 int left)
568 {
569 int error;
570 int i;
571
572 if (left)
573 error = xfs_btree_decrement(cur, 0, &i);
574 else
575 error = xfs_btree_increment(cur, 0, &i);
576
577 if (error)
578 return error;
579 *done = !i;
580 if (i) {
581 error = xfs_inobt_get_rec(cur, rec, &i);
582 if (error)
583 return error;
584 XFS_WANT_CORRUPTED_RETURN(i == 1);
585 }
586
587 return 0;
588 }
589
590 STATIC int
591 xfs_ialloc_get_rec(
592 struct xfs_btree_cur *cur,
593 xfs_agino_t agino,
594 xfs_inobt_rec_incore_t *rec,
595 int *done,
596 int left)
597 {
598 int error;
599 int i;
600
601 error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_EQ, &i);
602 if (error)
603 return error;
604 *done = !i;
605 if (i) {
606 error = xfs_inobt_get_rec(cur, rec, &i);
607 if (error)
608 return error;
609 XFS_WANT_CORRUPTED_RETURN(i == 1);
610 }
611
612 return 0;
613 }
614
615 /*
616 * Visible inode allocation functions.
617 */
618
619 /*
620 * Allocate an inode on disk.
621 * Mode is used to tell whether the new inode will need space, and whether
622 * it is a directory.
623 *
624 * The arguments IO_agbp and alloc_done are defined to work within
625 * the constraint of one allocation per transaction.
626 * xfs_dialloc() is designed to be called twice if it has to do an
627 * allocation to make more free inodes. On the first call,
628 * IO_agbp should be set to NULL. If an inode is available,
629 * i.e., xfs_dialloc() did not need to do an allocation, an inode
630 * number is returned. In this case, IO_agbp would be set to the
631 * current ag_buf and alloc_done set to false.
632 * If an allocation needed to be done, xfs_dialloc would return
633 * the current ag_buf in IO_agbp and set alloc_done to true.
634 * The caller should then commit the current transaction, allocate a new
635 * transaction, and call xfs_dialloc() again, passing in the previous
636 * value of IO_agbp. IO_agbp should be held across the transactions.
637 * Since the agbp is locked across the two calls, the second call is
638 * guaranteed to have a free inode available.
639 *
640 * Once we successfully pick an inode its number is returned and the
641 * on-disk data structures are updated. The inode itself is not read
642 * in, since doing so would break ordering constraints with xfs_reclaim.
643 */
644 int
645 xfs_dialloc(
646 xfs_trans_t *tp, /* transaction pointer */
647 xfs_ino_t parent, /* parent inode (directory) */
648 mode_t mode, /* mode bits for new inode */
649 int okalloc, /* ok to allocate more space */
650 xfs_buf_t **IO_agbp, /* in/out ag header's buffer */
651 boolean_t *alloc_done, /* true if we needed to replenish
652 inode freelist */
653 xfs_ino_t *inop) /* inode number allocated */
654 {
655 xfs_agnumber_t agcount; /* number of allocation groups */
656 xfs_buf_t *agbp; /* allocation group header's buffer */
657 xfs_agnumber_t agno; /* allocation group number */
658 xfs_agi_t *agi; /* allocation group header structure */
659 xfs_btree_cur_t *cur; /* inode allocation btree cursor */
660 int error; /* error return value */
661 int i; /* result code */
662 int ialloced; /* inode allocation status */
663 int noroom = 0; /* no space for inode blk allocation */
664 xfs_ino_t ino; /* fs-relative inode to be returned */
665 /* REFERENCED */
666 int j; /* result code */
667 xfs_mount_t *mp; /* file system mount structure */
668 int offset; /* index of inode in chunk */
669 xfs_agino_t pagino; /* parent's AG relative inode # */
670 xfs_agnumber_t pagno; /* parent's AG number */
671 xfs_inobt_rec_incore_t rec; /* inode allocation record */
672 xfs_agnumber_t tagno; /* testing allocation group number */
673 xfs_btree_cur_t *tcur; /* temp cursor */
674 xfs_inobt_rec_incore_t trec; /* temp inode allocation record */
675
676
677 if (*IO_agbp == NULL) {
678 /*
679 * We do not have an agbp, so select an initial allocation
680 * group for inode allocation.
681 */
682 agbp = xfs_ialloc_ag_select(tp, parent, mode, okalloc);
683 /*
684 * Couldn't find an allocation group satisfying the
685 * criteria, give up.
686 */
687 if (!agbp) {
688 *inop = NULLFSINO;
689 return 0;
690 }
691 agi = XFS_BUF_TO_AGI(agbp);
692 ASSERT(be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC);
693 } else {
694 /*
695 * Continue where we left off before. In this case, we
696 * know that the allocation group has free inodes.
697 */
698 agbp = *IO_agbp;
699 agi = XFS_BUF_TO_AGI(agbp);
700 ASSERT(be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC);
701 ASSERT(be32_to_cpu(agi->agi_freecount) > 0);
702 }
703 mp = tp->t_mountp;
704 agcount = mp->m_sb.sb_agcount;
705 agno = be32_to_cpu(agi->agi_seqno);
706 tagno = agno;
707 pagno = XFS_INO_TO_AGNO(mp, parent);
708 pagino = XFS_INO_TO_AGINO(mp, parent);
709
710 /*
711 * If we have already hit the ceiling of inode blocks then clear
712 * okalloc so we scan all available agi structures for a free
713 * inode.
714 */
715
716 if (mp->m_maxicount &&
717 mp->m_sb.sb_icount + XFS_IALLOC_INODES(mp) > mp->m_maxicount) {
718 noroom = 1;
719 okalloc = 0;
720 }
721
722 /*
723 * Loop until we find an allocation group that either has free inodes
724 * or in which we can allocate some inodes. Iterate through the
725 * allocation groups upward, wrapping at the end.
726 */
727 *alloc_done = B_FALSE;
728 while (!agi->agi_freecount) {
729 /*
730 * Don't do anything if we're not supposed to allocate
731 * any blocks, just go on to the next ag.
732 */
733 if (okalloc) {
734 /*
735 * Try to allocate some new inodes in the allocation
736 * group.
737 */
738 if ((error = xfs_ialloc_ag_alloc(tp, agbp, &ialloced))) {
739 xfs_trans_brelse(tp, agbp);
740 if (error == ENOSPC) {
741 *inop = NULLFSINO;
742 return 0;
743 } else
744 return error;
745 }
746 if (ialloced) {
747 /*
748 * We successfully allocated some inodes, return
749 * the current context to the caller so that it
750 * can commit the current transaction and call
751 * us again where we left off.
752 */
753 ASSERT(be32_to_cpu(agi->agi_freecount) > 0);
754 *alloc_done = B_TRUE;
755 *IO_agbp = agbp;
756 *inop = NULLFSINO;
757 return 0;
758 }
759 }
760 /*
761 * If it failed, give up on this ag.
762 */
763 xfs_trans_brelse(tp, agbp);
764 /*
765 * Go on to the next ag: get its ag header.
766 */
767 nextag:
768 if (++tagno == agcount)
769 tagno = 0;
770 if (tagno == agno) {
771 *inop = NULLFSINO;
772 return noroom ? ENOSPC : 0;
773 }
774 down_read(&mp->m_peraglock);
775 if (mp->m_perag[tagno].pagi_inodeok == 0) {
776 up_read(&mp->m_peraglock);
777 goto nextag;
778 }
779 error = xfs_ialloc_read_agi(mp, tp, tagno, &agbp);
780 up_read(&mp->m_peraglock);
781 if (error)
782 goto nextag;
783 agi = XFS_BUF_TO_AGI(agbp);
784 ASSERT(be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC);
785 }
786 /*
787 * Here with an allocation group that has a free inode.
788 * Reset agno since we may have chosen a new ag in the
789 * loop above.
790 */
791 agno = tagno;
792 *IO_agbp = NULL;
793
794 restart_pagno:
795 cur = xfs_inobt_init_cursor(mp, tp, agbp, be32_to_cpu(agi->agi_seqno));
796 /*
797 * If pagino is 0 (this is the root inode allocation) use newino.
798 * This must work because we've just allocated some.
799 */
800 if (!pagino)
801 pagino = be32_to_cpu(agi->agi_newino);
802
803 error = xfs_check_agi_freecount(cur, agi);
804 if (error)
805 goto error0;
806
807 /*
808 * If in the same AG as the parent, try to get near the parent.
809 */
810 if (pagno == agno) {
811 xfs_perag_t *pag = &mp->m_perag[agno];
812 int doneleft; /* done, to the left */
813 int doneright; /* done, to the right */
814 int searchdistance = 10;
815
816 error = xfs_inobt_lookup(cur, pagino, XFS_LOOKUP_LE, &i);
817 if (error)
818 goto error0;
819 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
820
821 error = xfs_inobt_get_rec(cur, &rec, &j);
822 if (error)
823 goto error0;
824 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
825
826 if (rec.ir_freecount > 0) {
827 /*
828 * Found a free inode in the same chunk
829 * as the parent, done.
830 */
831 goto alloc_inode;
832 }
833
834
835 /*
836 * In the same AG as parent, but parent's chunk is full.
837 */
838
839 /* duplicate the cursor, search left & right simultaneously */
840 error = xfs_btree_dup_cursor(cur, &tcur);
841 if (error)
842 goto error0;
843
844 /*
845 * Skip to last blocks looked up if same parent inode.
846 */
847 if (pagino != NULLAGINO &&
848 pag->pagl_pagino == pagino &&
849 pag->pagl_leftrec != NULLAGINO &&
850 pag->pagl_rightrec != NULLAGINO) {
851 error = xfs_ialloc_get_rec(tcur, pag->pagl_leftrec,
852 &trec, &doneleft, 1);
853 if (error)
854 goto error1;
855
856 error = xfs_ialloc_get_rec(cur, pag->pagl_rightrec,
857 &rec, &doneright, 0);
858 if (error)
859 goto error1;
860 } else {
861 /* search left with tcur, back up 1 record */
862 error = xfs_ialloc_next_rec(tcur, &trec, &doneleft, 1);
863 if (error)
864 goto error1;
865
866 /* search right with cur, go forward 1 record. */
867 error = xfs_ialloc_next_rec(cur, &rec, &doneright, 0);
868 if (error)
869 goto error1;
870 }
871
872 /*
873 * Loop until we find an inode chunk with a free inode.
874 */
875 while (!doneleft || !doneright) {
876 int useleft; /* using left inode chunk this time */
877
878 if (!--searchdistance) {
879 /*
880 * Not in range - save last search
881 * location and allocate a new inode
882 */
883 pag->pagl_leftrec = trec.ir_startino;
884 pag->pagl_rightrec = rec.ir_startino;
885 pag->pagl_pagino = pagino;
886 goto newino;
887 }
888
889 /* figure out the closer block if both are valid. */
890 if (!doneleft && !doneright) {
891 useleft = pagino -
892 (trec.ir_startino + XFS_INODES_PER_CHUNK - 1) <
893 rec.ir_startino - pagino;
894 } else {
895 useleft = !doneleft;
896 }
897
898 /* free inodes to the left? */
899 if (useleft && trec.ir_freecount) {
900 rec = trec;
901 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
902 cur = tcur;
903
904 pag->pagl_leftrec = trec.ir_startino;
905 pag->pagl_rightrec = rec.ir_startino;
906 pag->pagl_pagino = pagino;
907 goto alloc_inode;
908 }
909
910 /* free inodes to the right? */
911 if (!useleft && rec.ir_freecount) {
912 xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
913
914 pag->pagl_leftrec = trec.ir_startino;
915 pag->pagl_rightrec = rec.ir_startino;
916 pag->pagl_pagino = pagino;
917 goto alloc_inode;
918 }
919
920 /* get next record to check */
921 if (useleft) {
922 error = xfs_ialloc_next_rec(tcur, &trec,
923 &doneleft, 1);
924 } else {
925 error = xfs_ialloc_next_rec(cur, &rec,
926 &doneright, 0);
927 }
928 if (error)
929 goto error1;
930 }
931
932 /*
933 * We've reached the end of the btree. because
934 * we are only searching a small chunk of the
935 * btree each search, there is obviously free
936 * inodes closer to the parent inode than we
937 * are now. restart the search again.
938 */
939 pag->pagl_pagino = NULLAGINO;
940 pag->pagl_leftrec = NULLAGINO;
941 pag->pagl_rightrec = NULLAGINO;
942 xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
943 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
944 goto restart_pagno;
945 }
946
947 /*
948 * In a different AG from the parent.
949 * See if the most recently allocated block has any free.
950 */
951 newino:
952 if (be32_to_cpu(agi->agi_newino) != NULLAGINO) {
953 error = xfs_inobt_lookup(cur, be32_to_cpu(agi->agi_newino),
954 XFS_LOOKUP_EQ, &i);
955 if (error)
956 goto error0;
957
958 if (i == 1) {
959 error = xfs_inobt_get_rec(cur, &rec, &j);
960 if (error)
961 goto error0;
962
963 if (j == 1 && rec.ir_freecount > 0) {
964 /*
965 * The last chunk allocated in the group
966 * still has a free inode.
967 */
968 goto alloc_inode;
969 }
970 }
971 }
972
973 /*
974 * None left in the last group, search the whole AG
975 */
976 error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &i);
977 if (error)
978 goto error0;
979 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
980
981 for (;;) {
982 error = xfs_inobt_get_rec(cur, &rec, &i);
983 if (error)
984 goto error0;
985 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
986 if (rec.ir_freecount > 0)
987 break;
988 error = xfs_btree_increment(cur, 0, &i);
989 if (error)
990 goto error0;
991 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
992 }
993
994 alloc_inode:
995 offset = xfs_ialloc_find_free(&rec.ir_free);
996 ASSERT(offset >= 0);
997 ASSERT(offset < XFS_INODES_PER_CHUNK);
998 ASSERT((XFS_AGINO_TO_OFFSET(mp, rec.ir_startino) %
999 XFS_INODES_PER_CHUNK) == 0);
1000 ino = XFS_AGINO_TO_INO(mp, agno, rec.ir_startino + offset);
1001 rec.ir_free &= ~XFS_INOBT_MASK(offset);
1002 rec.ir_freecount--;
1003 error = xfs_inobt_update(cur, &rec);
1004 if (error)
1005 goto error0;
1006 be32_add_cpu(&agi->agi_freecount, -1);
1007 xfs_ialloc_log_agi(tp, agbp, XFS_AGI_FREECOUNT);
1008 down_read(&mp->m_peraglock);
1009 mp->m_perag[tagno].pagi_freecount--;
1010 up_read(&mp->m_peraglock);
1011
1012 error = xfs_check_agi_freecount(cur, agi);
1013 if (error)
1014 goto error0;
1015
1016 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
1017 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, -1);
1018 *inop = ino;
1019 return 0;
1020 error1:
1021 xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
1022 error0:
1023 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
1024 return error;
1025 }
1026
1027 /*
1028 * Free disk inode. Carefully avoids touching the incore inode, all
1029 * manipulations incore are the caller's responsibility.
1030 * The on-disk inode is not changed by this operation, only the
1031 * btree (free inode mask) is changed.
1032 */
1033 int
1034 xfs_difree(
1035 xfs_trans_t *tp, /* transaction pointer */
1036 xfs_ino_t inode, /* inode to be freed */
1037 xfs_bmap_free_t *flist, /* extents to free */
1038 int *delete, /* set if inode cluster was deleted */
1039 xfs_ino_t *first_ino) /* first inode in deleted cluster */
1040 {
1041 /* REFERENCED */
1042 xfs_agblock_t agbno; /* block number containing inode */
1043 xfs_buf_t *agbp; /* buffer containing allocation group header */
1044 xfs_agino_t agino; /* inode number relative to allocation group */
1045 xfs_agnumber_t agno; /* allocation group number */
1046 xfs_agi_t *agi; /* allocation group header */
1047 xfs_btree_cur_t *cur; /* inode btree cursor */
1048 int error; /* error return value */
1049 int i; /* result code */
1050 int ilen; /* inodes in an inode cluster */
1051 xfs_mount_t *mp; /* mount structure for filesystem */
1052 int off; /* offset of inode in inode chunk */
1053 xfs_inobt_rec_incore_t rec; /* btree record */
1054
1055 mp = tp->t_mountp;
1056
1057 /*
1058 * Break up inode number into its components.
1059 */
1060 agno = XFS_INO_TO_AGNO(mp, inode);
1061 if (agno >= mp->m_sb.sb_agcount) {
1062 cmn_err(CE_WARN,
1063 "xfs_difree: agno >= mp->m_sb.sb_agcount (%d >= %d) on %s. Returning EINVAL.",
1064 agno, mp->m_sb.sb_agcount, mp->m_fsname);
1065 ASSERT(0);
1066 return XFS_ERROR(EINVAL);
1067 }
1068 agino = XFS_INO_TO_AGINO(mp, inode);
1069 if (inode != XFS_AGINO_TO_INO(mp, agno, agino)) {
1070 cmn_err(CE_WARN,
1071 "xfs_difree: inode != XFS_AGINO_TO_INO() "
1072 "(%llu != %llu) on %s. Returning EINVAL.",
1073 (unsigned long long)inode,
1074 (unsigned long long)XFS_AGINO_TO_INO(mp, agno, agino),
1075 mp->m_fsname);
1076 ASSERT(0);
1077 return XFS_ERROR(EINVAL);
1078 }
1079 agbno = XFS_AGINO_TO_AGBNO(mp, agino);
1080 if (agbno >= mp->m_sb.sb_agblocks) {
1081 cmn_err(CE_WARN,
1082 "xfs_difree: agbno >= mp->m_sb.sb_agblocks (%d >= %d) on %s. Returning EINVAL.",
1083 agbno, mp->m_sb.sb_agblocks, mp->m_fsname);
1084 ASSERT(0);
1085 return XFS_ERROR(EINVAL);
1086 }
1087 /*
1088 * Get the allocation group header.
1089 */
1090 down_read(&mp->m_peraglock);
1091 error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);
1092 up_read(&mp->m_peraglock);
1093 if (error) {
1094 cmn_err(CE_WARN,
1095 "xfs_difree: xfs_ialloc_read_agi() returned an error %d on %s. Returning error.",
1096 error, mp->m_fsname);
1097 return error;
1098 }
1099 agi = XFS_BUF_TO_AGI(agbp);
1100 ASSERT(be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC);
1101 ASSERT(agbno < be32_to_cpu(agi->agi_length));
1102 /*
1103 * Initialize the cursor.
1104 */
1105 cur = xfs_inobt_init_cursor(mp, tp, agbp, agno);
1106
1107 error = xfs_check_agi_freecount(cur, agi);
1108 if (error)
1109 goto error0;
1110
1111 /*
1112 * Look for the entry describing this inode.
1113 */
1114 if ((error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE, &i))) {
1115 cmn_err(CE_WARN,
1116 "xfs_difree: xfs_inobt_lookup returned() an error %d on %s. Returning error.",
1117 error, mp->m_fsname);
1118 goto error0;
1119 }
1120 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
1121 error = xfs_inobt_get_rec(cur, &rec, &i);
1122 if (error) {
1123 cmn_err(CE_WARN,
1124 "xfs_difree: xfs_inobt_get_rec() returned an error %d on %s. Returning error.",
1125 error, mp->m_fsname);
1126 goto error0;
1127 }
1128 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
1129 /*
1130 * Get the offset in the inode chunk.
1131 */
1132 off = agino - rec.ir_startino;
1133 ASSERT(off >= 0 && off < XFS_INODES_PER_CHUNK);
1134 ASSERT(!(rec.ir_free & XFS_INOBT_MASK(off)));
1135 /*
1136 * Mark the inode free & increment the count.
1137 */
1138 rec.ir_free |= XFS_INOBT_MASK(off);
1139 rec.ir_freecount++;
1140
1141 /*
1142 * When an inode cluster is free, it becomes eligible for removal
1143 */
1144 if (!(mp->m_flags & XFS_MOUNT_IKEEP) &&
1145 (rec.ir_freecount == XFS_IALLOC_INODES(mp))) {
1146
1147 *delete = 1;
1148 *first_ino = XFS_AGINO_TO_INO(mp, agno, rec.ir_startino);
1149
1150 /*
1151 * Remove the inode cluster from the AGI B+Tree, adjust the
1152 * AGI and Superblock inode counts, and mark the disk space
1153 * to be freed when the transaction is committed.
1154 */
1155 ilen = XFS_IALLOC_INODES(mp);
1156 be32_add_cpu(&agi->agi_count, -ilen);
1157 be32_add_cpu(&agi->agi_freecount, -(ilen - 1));
1158 xfs_ialloc_log_agi(tp, agbp, XFS_AGI_COUNT | XFS_AGI_FREECOUNT);
1159 down_read(&mp->m_peraglock);
1160 mp->m_perag[agno].pagi_freecount -= ilen - 1;
1161 up_read(&mp->m_peraglock);
1162 xfs_trans_mod_sb(tp, XFS_TRANS_SB_ICOUNT, -ilen);
1163 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, -(ilen - 1));
1164
1165 if ((error = xfs_btree_delete(cur, &i))) {
1166 cmn_err(CE_WARN, "xfs_difree: xfs_btree_delete returned an error %d on %s.\n",
1167 error, mp->m_fsname);
1168 goto error0;
1169 }
1170
1171 xfs_bmap_add_free(XFS_AGB_TO_FSB(mp,
1172 agno, XFS_INO_TO_AGBNO(mp,rec.ir_startino)),
1173 XFS_IALLOC_BLOCKS(mp), flist, mp);
1174 } else {
1175 *delete = 0;
1176
1177 error = xfs_inobt_update(cur, &rec);
1178 if (error) {
1179 cmn_err(CE_WARN,
1180 "xfs_difree: xfs_inobt_update returned an error %d on %s.",
1181 error, mp->m_fsname);
1182 goto error0;
1183 }
1184
1185 /*
1186 * Change the inode free counts and log the ag/sb changes.
1187 */
1188 be32_add_cpu(&agi->agi_freecount, 1);
1189 xfs_ialloc_log_agi(tp, agbp, XFS_AGI_FREECOUNT);
1190 down_read(&mp->m_peraglock);
1191 mp->m_perag[agno].pagi_freecount++;
1192 up_read(&mp->m_peraglock);
1193 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, 1);
1194 }
1195
1196 error = xfs_check_agi_freecount(cur, agi);
1197 if (error)
1198 goto error0;
1199
1200 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
1201 return 0;
1202
1203 error0:
1204 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
1205 return error;
1206 }
1207
1208 /*
1209 * Return the location of the inode in imap, for mapping it into a buffer.
1210 */
1211 int
1212 xfs_imap(
1213 xfs_mount_t *mp, /* file system mount structure */
1214 xfs_trans_t *tp, /* transaction pointer */
1215 xfs_ino_t ino, /* inode to locate */
1216 struct xfs_imap *imap, /* location map structure */
1217 uint flags) /* flags for inode btree lookup */
1218 {
1219 xfs_agblock_t agbno; /* block number of inode in the alloc group */
1220 xfs_agino_t agino; /* inode number within alloc group */
1221 xfs_agnumber_t agno; /* allocation group number */
1222 int blks_per_cluster; /* num blocks per inode cluster */
1223 xfs_agblock_t chunk_agbno; /* first block in inode chunk */
1224 xfs_agblock_t cluster_agbno; /* first block in inode cluster */
1225 int error; /* error code */
1226 int offset; /* index of inode in its buffer */
1227 int offset_agbno; /* blks from chunk start to inode */
1228
1229 ASSERT(ino != NULLFSINO);
1230
1231 /*
1232 * Split up the inode number into its parts.
1233 */
1234 agno = XFS_INO_TO_AGNO(mp, ino);
1235 agino = XFS_INO_TO_AGINO(mp, ino);
1236 agbno = XFS_AGINO_TO_AGBNO(mp, agino);
1237 if (agno >= mp->m_sb.sb_agcount || agbno >= mp->m_sb.sb_agblocks ||
1238 ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
1239 #ifdef DEBUG
1240 /* no diagnostics for bulkstat, ino comes from userspace */
1241 if (flags & XFS_IGET_BULKSTAT)
1242 return XFS_ERROR(EINVAL);
1243 if (agno >= mp->m_sb.sb_agcount) {
1244 xfs_fs_cmn_err(CE_ALERT, mp,
1245 "xfs_imap: agno (%d) >= "
1246 "mp->m_sb.sb_agcount (%d)",
1247 agno, mp->m_sb.sb_agcount);
1248 }
1249 if (agbno >= mp->m_sb.sb_agblocks) {
1250 xfs_fs_cmn_err(CE_ALERT, mp,
1251 "xfs_imap: agbno (0x%llx) >= "
1252 "mp->m_sb.sb_agblocks (0x%lx)",
1253 (unsigned long long) agbno,
1254 (unsigned long) mp->m_sb.sb_agblocks);
1255 }
1256 if (ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
1257 xfs_fs_cmn_err(CE_ALERT, mp,
1258 "xfs_imap: ino (0x%llx) != "
1259 "XFS_AGINO_TO_INO(mp, agno, agino) "
1260 "(0x%llx)",
1261 ino, XFS_AGINO_TO_INO(mp, agno, agino));
1262 }
1263 xfs_stack_trace();
1264 #endif /* DEBUG */
1265 return XFS_ERROR(EINVAL);
1266 }
1267
1268 /*
1269 * If the inode cluster size is the same as the blocksize or
1270 * smaller we get to the buffer by simple arithmetics.
1271 */
1272 if (XFS_INODE_CLUSTER_SIZE(mp) <= mp->m_sb.sb_blocksize) {
1273 offset = XFS_INO_TO_OFFSET(mp, ino);
1274 ASSERT(offset < mp->m_sb.sb_inopblock);
1275
1276 imap->im_blkno = XFS_AGB_TO_DADDR(mp, agno, agbno);
1277 imap->im_len = XFS_FSB_TO_BB(mp, 1);
1278 imap->im_boffset = (ushort)(offset << mp->m_sb.sb_inodelog);
1279 return 0;
1280 }
1281
1282 blks_per_cluster = XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_blocklog;
1283
1284 /*
1285 * If we get a block number passed from bulkstat we can use it to
1286 * find the buffer easily.
1287 */
1288 if (imap->im_blkno) {
1289 offset = XFS_INO_TO_OFFSET(mp, ino);
1290 ASSERT(offset < mp->m_sb.sb_inopblock);
1291
1292 cluster_agbno = xfs_daddr_to_agbno(mp, imap->im_blkno);
1293 offset += (agbno - cluster_agbno) * mp->m_sb.sb_inopblock;
1294
1295 imap->im_len = XFS_FSB_TO_BB(mp, blks_per_cluster);
1296 imap->im_boffset = (ushort)(offset << mp->m_sb.sb_inodelog);
1297 return 0;
1298 }
1299
1300 /*
1301 * If the inode chunks are aligned then use simple maths to
1302 * find the location. Otherwise we have to do a btree
1303 * lookup to find the location.
1304 */
1305 if (mp->m_inoalign_mask) {
1306 offset_agbno = agbno & mp->m_inoalign_mask;
1307 chunk_agbno = agbno - offset_agbno;
1308 } else {
1309 xfs_btree_cur_t *cur; /* inode btree cursor */
1310 xfs_inobt_rec_incore_t chunk_rec;
1311 xfs_buf_t *agbp; /* agi buffer */
1312 int i; /* temp state */
1313
1314 down_read(&mp->m_peraglock);
1315 error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);
1316 up_read(&mp->m_peraglock);
1317 if (error) {
1318 xfs_fs_cmn_err(CE_ALERT, mp, "xfs_imap: "
1319 "xfs_ialloc_read_agi() returned "
1320 "error %d, agno %d",
1321 error, agno);
1322 return error;
1323 }
1324
1325 cur = xfs_inobt_init_cursor(mp, tp, agbp, agno);
1326 error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE, &i);
1327 if (error) {
1328 xfs_fs_cmn_err(CE_ALERT, mp, "xfs_imap: "
1329 "xfs_inobt_lookup() failed");
1330 goto error0;
1331 }
1332
1333 error = xfs_inobt_get_rec(cur, &chunk_rec, &i);
1334 if (error) {
1335 xfs_fs_cmn_err(CE_ALERT, mp, "xfs_imap: "
1336 "xfs_inobt_get_rec() failed");
1337 goto error0;
1338 }
1339 if (i == 0) {
1340 #ifdef DEBUG
1341 xfs_fs_cmn_err(CE_ALERT, mp, "xfs_imap: "
1342 "xfs_inobt_get_rec() failed");
1343 #endif /* DEBUG */
1344 error = XFS_ERROR(EINVAL);
1345 }
1346 error0:
1347 xfs_trans_brelse(tp, agbp);
1348 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
1349 if (error)
1350 return error;
1351 chunk_agbno = XFS_AGINO_TO_AGBNO(mp, chunk_rec.ir_startino);
1352 offset_agbno = agbno - chunk_agbno;
1353 }
1354
1355 ASSERT(agbno >= chunk_agbno);
1356 cluster_agbno = chunk_agbno +
1357 ((offset_agbno / blks_per_cluster) * blks_per_cluster);
1358 offset = ((agbno - cluster_agbno) * mp->m_sb.sb_inopblock) +
1359 XFS_INO_TO_OFFSET(mp, ino);
1360
1361 imap->im_blkno = XFS_AGB_TO_DADDR(mp, agno, cluster_agbno);
1362 imap->im_len = XFS_FSB_TO_BB(mp, blks_per_cluster);
1363 imap->im_boffset = (ushort)(offset << mp->m_sb.sb_inodelog);
1364
1365 /*
1366 * If the inode number maps to a block outside the bounds
1367 * of the file system then return NULL rather than calling
1368 * read_buf and panicing when we get an error from the
1369 * driver.
1370 */
1371 if ((imap->im_blkno + imap->im_len) >
1372 XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)) {
1373 xfs_fs_cmn_err(CE_ALERT, mp, "xfs_imap: "
1374 "(imap->im_blkno (0x%llx) + imap->im_len (0x%llx)) > "
1375 " XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks) (0x%llx)",
1376 (unsigned long long) imap->im_blkno,
1377 (unsigned long long) imap->im_len,
1378 XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks));
1379 return XFS_ERROR(EINVAL);
1380 }
1381
1382 return 0;
1383 }
1384
1385 /*
1386 * Compute and fill in value of m_in_maxlevels.
1387 */
1388 void
1389 xfs_ialloc_compute_maxlevels(
1390 xfs_mount_t *mp) /* file system mount structure */
1391 {
1392 int level;
1393 uint maxblocks;
1394 uint maxleafents;
1395 int minleafrecs;
1396 int minnoderecs;
1397
1398 maxleafents = (1LL << XFS_INO_AGINO_BITS(mp)) >>
1399 XFS_INODES_PER_CHUNK_LOG;
1400 minleafrecs = mp->m_alloc_mnr[0];
1401 minnoderecs = mp->m_alloc_mnr[1];
1402 maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
1403 for (level = 1; maxblocks > 1; level++)
1404 maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
1405 mp->m_in_maxlevels = level;
1406 }
1407
1408 /*
1409 * Log specified fields for the ag hdr (inode section)
1410 */
1411 void
1412 xfs_ialloc_log_agi(
1413 xfs_trans_t *tp, /* transaction pointer */
1414 xfs_buf_t *bp, /* allocation group header buffer */
1415 int fields) /* bitmask of fields to log */
1416 {
1417 int first; /* first byte number */
1418 int last; /* last byte number */
1419 static const short offsets[] = { /* field starting offsets */
1420 /* keep in sync with bit definitions */
1421 offsetof(xfs_agi_t, agi_magicnum),
1422 offsetof(xfs_agi_t, agi_versionnum),
1423 offsetof(xfs_agi_t, agi_seqno),
1424 offsetof(xfs_agi_t, agi_length),
1425 offsetof(xfs_agi_t, agi_count),
1426 offsetof(xfs_agi_t, agi_root),
1427 offsetof(xfs_agi_t, agi_level),
1428 offsetof(xfs_agi_t, agi_freecount),
1429 offsetof(xfs_agi_t, agi_newino),
1430 offsetof(xfs_agi_t, agi_dirino),
1431 offsetof(xfs_agi_t, agi_unlinked),
1432 sizeof(xfs_agi_t)
1433 };
1434 #ifdef DEBUG
1435 xfs_agi_t *agi; /* allocation group header */
1436
1437 agi = XFS_BUF_TO_AGI(bp);
1438 ASSERT(be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC);
1439 #endif
1440 /*
1441 * Compute byte offsets for the first and last fields.
1442 */
1443 xfs_btree_offsets(fields, offsets, XFS_AGI_NUM_BITS, &first, &last);
1444 /*
1445 * Log the allocation group inode header buffer.
1446 */
1447 xfs_trans_log_buf(tp, bp, first, last);
1448 }
1449
1450 #ifdef DEBUG
1451 STATIC void
1452 xfs_check_agi_unlinked(
1453 struct xfs_agi *agi)
1454 {
1455 int i;
1456
1457 for (i = 0; i < XFS_AGI_UNLINKED_BUCKETS; i++)
1458 ASSERT(agi->agi_unlinked[i]);
1459 }
1460 #else
1461 #define xfs_check_agi_unlinked(agi)
1462 #endif
1463
1464 /*
1465 * Read in the allocation group header (inode allocation section)
1466 */
1467 int
1468 xfs_read_agi(
1469 struct xfs_mount *mp, /* file system mount structure */
1470 struct xfs_trans *tp, /* transaction pointer */
1471 xfs_agnumber_t agno, /* allocation group number */
1472 struct xfs_buf **bpp) /* allocation group hdr buf */
1473 {
1474 struct xfs_agi *agi; /* allocation group header */
1475 int agi_ok; /* agi is consistent */
1476 int error;
1477
1478 ASSERT(agno != NULLAGNUMBER);
1479
1480 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
1481 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
1482 XFS_FSS_TO_BB(mp, 1), 0, bpp);
1483 if (error)
1484 return error;
1485
1486 ASSERT(*bpp && !XFS_BUF_GETERROR(*bpp));
1487 agi = XFS_BUF_TO_AGI(*bpp);
1488
1489 /*
1490 * Validate the magic number of the agi block.
1491 */
1492 agi_ok = be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC &&
1493 XFS_AGI_GOOD_VERSION(be32_to_cpu(agi->agi_versionnum)) &&
1494 be32_to_cpu(agi->agi_seqno) == agno;
1495 if (unlikely(XFS_TEST_ERROR(!agi_ok, mp, XFS_ERRTAG_IALLOC_READ_AGI,
1496 XFS_RANDOM_IALLOC_READ_AGI))) {
1497 XFS_CORRUPTION_ERROR("xfs_read_agi", XFS_ERRLEVEL_LOW,
1498 mp, agi);
1499 xfs_trans_brelse(tp, *bpp);
1500 return XFS_ERROR(EFSCORRUPTED);
1501 }
1502
1503 XFS_BUF_SET_VTYPE_REF(*bpp, B_FS_AGI, XFS_AGI_REF);
1504
1505 xfs_check_agi_unlinked(agi);
1506 return 0;
1507 }
1508
1509 int
1510 xfs_ialloc_read_agi(
1511 struct xfs_mount *mp, /* file system mount structure */
1512 struct xfs_trans *tp, /* transaction pointer */
1513 xfs_agnumber_t agno, /* allocation group number */
1514 struct xfs_buf **bpp) /* allocation group hdr buf */
1515 {
1516 struct xfs_agi *agi; /* allocation group header */
1517 struct xfs_perag *pag; /* per allocation group data */
1518 int error;
1519
1520 error = xfs_read_agi(mp, tp, agno, bpp);
1521 if (error)
1522 return error;
1523
1524 agi = XFS_BUF_TO_AGI(*bpp);
1525 pag = &mp->m_perag[agno];
1526
1527 if (!pag->pagi_init) {
1528 pag->pagi_freecount = be32_to_cpu(agi->agi_freecount);
1529 pag->pagi_count = be32_to_cpu(agi->agi_count);
1530 pag->pagi_init = 1;
1531 }
1532
1533 /*
1534 * It's possible for these to be out of sync if
1535 * we are in the middle of a forced shutdown.
1536 */
1537 ASSERT(pag->pagi_freecount == be32_to_cpu(agi->agi_freecount) ||
1538 XFS_FORCED_SHUTDOWN(mp));
1539 return 0;
1540 }
1541
1542 /*
1543 * Read in the agi to initialise the per-ag data in the mount structure
1544 */
1545 int
1546 xfs_ialloc_pagi_init(
1547 xfs_mount_t *mp, /* file system mount structure */
1548 xfs_trans_t *tp, /* transaction pointer */
1549 xfs_agnumber_t agno) /* allocation group number */
1550 {
1551 xfs_buf_t *bp = NULL;
1552 int error;
1553
1554 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
1555 if (error)
1556 return error;
1557 if (bp)
1558 xfs_trans_brelse(tp, bp);
1559 return 0;
1560 }
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