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[JFFS2] Check for all-zero node headers
[linux-2.6/kmemtrace.git] / fs / xfs / xfs_ialloc.c
blobb5feb3e77116258a21eff655dc62304951fb35d2
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 * Log specified fields for the inode given by bp and off.
46 */
47 STATIC void
48 xfs_ialloc_log_di(
49 xfs_trans_t *tp, /* transaction pointer */
50 xfs_buf_t *bp, /* inode buffer */
51 int off, /* index of inode in buffer */
52 int fields) /* bitmask of fields to log */
53 {
54 int first; /* first byte number */
55 int ioffset; /* off in bytes */
56 int last; /* last byte number */
57 xfs_mount_t *mp; /* mount point structure */
58 static const short offsets[] = { /* field offsets */
59 /* keep in sync with bits */
60 offsetof(xfs_dinode_core_t, di_magic),
61 offsetof(xfs_dinode_core_t, di_mode),
62 offsetof(xfs_dinode_core_t, di_version),
63 offsetof(xfs_dinode_core_t, di_format),
64 offsetof(xfs_dinode_core_t, di_onlink),
65 offsetof(xfs_dinode_core_t, di_uid),
66 offsetof(xfs_dinode_core_t, di_gid),
67 offsetof(xfs_dinode_core_t, di_nlink),
68 offsetof(xfs_dinode_core_t, di_projid),
69 offsetof(xfs_dinode_core_t, di_pad),
70 offsetof(xfs_dinode_core_t, di_atime),
71 offsetof(xfs_dinode_core_t, di_mtime),
72 offsetof(xfs_dinode_core_t, di_ctime),
73 offsetof(xfs_dinode_core_t, di_size),
74 offsetof(xfs_dinode_core_t, di_nblocks),
75 offsetof(xfs_dinode_core_t, di_extsize),
76 offsetof(xfs_dinode_core_t, di_nextents),
77 offsetof(xfs_dinode_core_t, di_anextents),
78 offsetof(xfs_dinode_core_t, di_forkoff),
79 offsetof(xfs_dinode_core_t, di_aformat),
80 offsetof(xfs_dinode_core_t, di_dmevmask),
81 offsetof(xfs_dinode_core_t, di_dmstate),
82 offsetof(xfs_dinode_core_t, di_flags),
83 offsetof(xfs_dinode_core_t, di_gen),
84 offsetof(xfs_dinode_t, di_next_unlinked),
85 offsetof(xfs_dinode_t, di_u),
86 offsetof(xfs_dinode_t, di_a),
87 sizeof(xfs_dinode_t)
88 };
89
90
91 ASSERT(offsetof(xfs_dinode_t, di_core) == 0);
92 ASSERT((fields & (XFS_DI_U|XFS_DI_A)) == 0);
93 mp = tp->t_mountp;
94 /*
95 * Get the inode-relative first and last bytes for these fields
96 */
97 xfs_btree_offsets(fields, offsets, XFS_DI_NUM_BITS, &first, &last);
98 /*
99 * Convert to buffer offsets and log it.
100 */
101 ioffset = off << mp->m_sb.sb_inodelog;
102 first += ioffset;
103 last += ioffset;
104 xfs_trans_log_buf(tp, bp, first, last);
105 }
106
107 /*
108 * Allocation group level functions.
109 */
110
111 /*
112 * Allocate new inodes in the allocation group specified by agbp.
113 * Return 0 for success, else error code.
114 */
115 STATIC int /* error code or 0 */
116 xfs_ialloc_ag_alloc(
117 xfs_trans_t *tp, /* transaction pointer */
118 xfs_buf_t *agbp, /* alloc group buffer */
119 int *alloc)
120 {
121 xfs_agi_t *agi; /* allocation group header */
122 xfs_alloc_arg_t args; /* allocation argument structure */
123 int blks_per_cluster; /* fs blocks per inode cluster */
124 xfs_btree_cur_t *cur; /* inode btree cursor */
125 xfs_daddr_t d; /* disk addr of buffer */
126 int error;
127 xfs_buf_t *fbuf; /* new free inodes' buffer */
128 xfs_dinode_t *free; /* new free inode structure */
129 int i; /* inode counter */
130 int j; /* block counter */
131 int nbufs; /* num bufs of new inodes */
132 xfs_agino_t newino; /* new first inode's number */
133 xfs_agino_t newlen; /* new number of inodes */
134 int ninodes; /* num inodes per buf */
135 xfs_agino_t thisino; /* current inode number, for loop */
136 int version; /* inode version number to use */
137 int isaligned = 0; /* inode allocation at stripe unit */
138 /* boundary */
139
140 args.tp = tp;
141 args.mp = tp->t_mountp;
142
143 /*
144 * Locking will ensure that we don't have two callers in here
145 * at one time.
146 */
147 newlen = XFS_IALLOC_INODES(args.mp);
148 if (args.mp->m_maxicount &&
149 args.mp->m_sb.sb_icount + newlen > args.mp->m_maxicount)
150 return XFS_ERROR(ENOSPC);
151 args.minlen = args.maxlen = XFS_IALLOC_BLOCKS(args.mp);
152 /*
153 * First try to allocate inodes contiguous with the last-allocated
154 * chunk of inodes. If the filesystem is striped, this will fill
155 * an entire stripe unit with inodes.
156 */
157 agi = XFS_BUF_TO_AGI(agbp);
158 newino = be32_to_cpu(agi->agi_newino);
159 args.agbno = XFS_AGINO_TO_AGBNO(args.mp, newino) +
160 XFS_IALLOC_BLOCKS(args.mp);
161 if (likely(newino != NULLAGINO &&
162 (args.agbno < be32_to_cpu(agi->agi_length)))) {
163 args.fsbno = XFS_AGB_TO_FSB(args.mp,
164 be32_to_cpu(agi->agi_seqno), args.agbno);
165 args.type = XFS_ALLOCTYPE_THIS_BNO;
166 args.mod = args.total = args.wasdel = args.isfl =
167 args.userdata = args.minalignslop = 0;
168 args.prod = 1;
169 args.alignment = 1;
170 /*
171 * Allow space for the inode btree to split.
172 */
173 args.minleft = XFS_IN_MAXLEVELS(args.mp) - 1;
174 if ((error = xfs_alloc_vextent(&args)))
175 return error;
176 } else
177 args.fsbno = NULLFSBLOCK;
178
179 if (unlikely(args.fsbno == NULLFSBLOCK)) {
180 /*
181 * Set the alignment for the allocation.
182 * If stripe alignment is turned on then align at stripe unit
183 * boundary.
184 * If the cluster size is smaller than a filesystem block
185 * then we're doing I/O for inodes in filesystem block size
186 * pieces, so don't need alignment anyway.
187 */
188 isaligned = 0;
189 if (args.mp->m_sinoalign) {
190 ASSERT(!(args.mp->m_flags & XFS_MOUNT_NOALIGN));
191 args.alignment = args.mp->m_dalign;
192 isaligned = 1;
193 } else if (XFS_SB_VERSION_HASALIGN(&args.mp->m_sb) &&
194 args.mp->m_sb.sb_inoalignmt >=
195 XFS_B_TO_FSBT(args.mp,
196 XFS_INODE_CLUSTER_SIZE(args.mp)))
197 args.alignment = args.mp->m_sb.sb_inoalignmt;
198 else
199 args.alignment = 1;
200 /*
201 * Need to figure out where to allocate the inode blocks.
202 * Ideally they should be spaced out through the a.g.
203 * For now, just allocate blocks up front.
204 */
205 args.agbno = be32_to_cpu(agi->agi_root);
206 args.fsbno = XFS_AGB_TO_FSB(args.mp,
207 be32_to_cpu(agi->agi_seqno), args.agbno);
208 /*
209 * Allocate a fixed-size extent of inodes.
210 */
211 args.type = XFS_ALLOCTYPE_NEAR_BNO;
212 args.mod = args.total = args.wasdel = args.isfl =
213 args.userdata = args.minalignslop = 0;
214 args.prod = 1;
215 /*
216 * Allow space for the inode btree to split.
217 */
218 args.minleft = XFS_IN_MAXLEVELS(args.mp) - 1;
219 if ((error = xfs_alloc_vextent(&args)))
220 return error;
221 }
222
223 /*
224 * If stripe alignment is turned on, then try again with cluster
225 * alignment.
226 */
227 if (isaligned && args.fsbno == NULLFSBLOCK) {
228 args.type = XFS_ALLOCTYPE_NEAR_BNO;
229 args.agbno = be32_to_cpu(agi->agi_root);
230 args.fsbno = XFS_AGB_TO_FSB(args.mp,
231 be32_to_cpu(agi->agi_seqno), args.agbno);
232 if (XFS_SB_VERSION_HASALIGN(&args.mp->m_sb) &&
233 args.mp->m_sb.sb_inoalignmt >=
234 XFS_B_TO_FSBT(args.mp, XFS_INODE_CLUSTER_SIZE(args.mp)))
235 args.alignment = args.mp->m_sb.sb_inoalignmt;
236 else
237 args.alignment = 1;
238 if ((error = xfs_alloc_vextent(&args)))
239 return error;
240 }
241
242 if (args.fsbno == NULLFSBLOCK) {
243 *alloc = 0;
244 return 0;
245 }
246 ASSERT(args.len == args.minlen);
247 /*
248 * Convert the results.
249 */
250 newino = XFS_OFFBNO_TO_AGINO(args.mp, args.agbno, 0);
251 /*
252 * Loop over the new block(s), filling in the inodes.
253 * For small block sizes, manipulate the inodes in buffers
254 * which are multiples of the blocks size.
255 */
256 if (args.mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(args.mp)) {
257 blks_per_cluster = 1;
258 nbufs = (int)args.len;
259 ninodes = args.mp->m_sb.sb_inopblock;
260 } else {
261 blks_per_cluster = XFS_INODE_CLUSTER_SIZE(args.mp) /
262 args.mp->m_sb.sb_blocksize;
263 nbufs = (int)args.len / blks_per_cluster;
264 ninodes = blks_per_cluster * args.mp->m_sb.sb_inopblock;
265 }
266 /*
267 * Figure out what version number to use in the inodes we create.
268 * If the superblock version has caught up to the one that supports
269 * the new inode format, then use the new inode version. Otherwise
270 * use the old version so that old kernels will continue to be
271 * able to use the file system.
272 */
273 if (XFS_SB_VERSION_HASNLINK(&args.mp->m_sb))
274 version = XFS_DINODE_VERSION_2;
275 else
276 version = XFS_DINODE_VERSION_1;
277
278 for (j = 0; j < nbufs; j++) {
279 /*
280 * Get the block.
281 */
282 d = XFS_AGB_TO_DADDR(args.mp, be32_to_cpu(agi->agi_seqno),
283 args.agbno + (j * blks_per_cluster));
284 fbuf = xfs_trans_get_buf(tp, args.mp->m_ddev_targp, d,
285 args.mp->m_bsize * blks_per_cluster,
286 XFS_BUF_LOCK);
287 ASSERT(fbuf);
288 ASSERT(!XFS_BUF_GETERROR(fbuf));
289 /*
290 * Set initial values for the inodes in this buffer.
291 */
292 xfs_biozero(fbuf, 0, ninodes << args.mp->m_sb.sb_inodelog);
293 for (i = 0; i < ninodes; i++) {
294 free = XFS_MAKE_IPTR(args.mp, fbuf, i);
295 INT_SET(free->di_core.di_magic, ARCH_CONVERT, XFS_DINODE_MAGIC);
296 INT_SET(free->di_core.di_version, ARCH_CONVERT, version);
297 INT_SET(free->di_next_unlinked, ARCH_CONVERT, NULLAGINO);
298 xfs_ialloc_log_di(tp, fbuf, i,
299 XFS_DI_CORE_BITS | XFS_DI_NEXT_UNLINKED);
300 }
301 xfs_trans_inode_alloc_buf(tp, fbuf);
302 }
303 be32_add(&agi->agi_count, newlen);
304 be32_add(&agi->agi_freecount, newlen);
305 down_read(&args.mp->m_peraglock);
306 args.mp->m_perag[be32_to_cpu(agi->agi_seqno)].pagi_freecount += newlen;
307 up_read(&args.mp->m_peraglock);
308 agi->agi_newino = cpu_to_be32(newino);
309 /*
310 * Insert records describing the new inode chunk into the btree.
311 */
312 cur = xfs_btree_init_cursor(args.mp, tp, agbp,
313 be32_to_cpu(agi->agi_seqno),
314 XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
315 for (thisino = newino;
316 thisino < newino + newlen;
317 thisino += XFS_INODES_PER_CHUNK) {
318 if ((error = xfs_inobt_lookup_eq(cur, thisino,
319 XFS_INODES_PER_CHUNK, XFS_INOBT_ALL_FREE, &i))) {
320 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
321 return error;
322 }
323 ASSERT(i == 0);
324 if ((error = xfs_inobt_insert(cur, &i))) {
325 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
326 return error;
327 }
328 ASSERT(i == 1);
329 }
330 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
331 /*
332 * Log allocation group header fields
333 */
334 xfs_ialloc_log_agi(tp, agbp,
335 XFS_AGI_COUNT | XFS_AGI_FREECOUNT | XFS_AGI_NEWINO);
336 /*
337 * Modify/log superblock values for inode count and inode free count.
338 */
339 xfs_trans_mod_sb(tp, XFS_TRANS_SB_ICOUNT, (long)newlen);
340 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, (long)newlen);
341 *alloc = 1;
342 return 0;
343 }
344
345 STATIC_INLINE xfs_agnumber_t
346 xfs_ialloc_next_ag(
347 xfs_mount_t *mp)
348 {
349 xfs_agnumber_t agno;
350
351 spin_lock(&mp->m_agirotor_lock);
352 agno = mp->m_agirotor;
353 if (++mp->m_agirotor == mp->m_maxagi)
354 mp->m_agirotor = 0;
355 spin_unlock(&mp->m_agirotor_lock);
356
357 return agno;
358 }
359
360 /*
361 * Select an allocation group to look for a free inode in, based on the parent
362 * inode and then mode. Return the allocation group buffer.
363 */
364 STATIC xfs_buf_t * /* allocation group buffer */
365 xfs_ialloc_ag_select(
366 xfs_trans_t *tp, /* transaction pointer */
367 xfs_ino_t parent, /* parent directory inode number */
368 mode_t mode, /* bits set to indicate file type */
369 int okalloc) /* ok to allocate more space */
370 {
371 xfs_buf_t *agbp; /* allocation group header buffer */
372 xfs_agnumber_t agcount; /* number of ag's in the filesystem */
373 xfs_agnumber_t agno; /* current ag number */
374 int flags; /* alloc buffer locking flags */
375 xfs_extlen_t ineed; /* blocks needed for inode allocation */
376 xfs_extlen_t longest = 0; /* longest extent available */
377 xfs_mount_t *mp; /* mount point structure */
378 int needspace; /* file mode implies space allocated */
379 xfs_perag_t *pag; /* per allocation group data */
380 xfs_agnumber_t pagno; /* parent (starting) ag number */
381
382 /*
383 * Files of these types need at least one block if length > 0
384 * (and they won't fit in the inode, but that's hard to figure out).
385 */
386 needspace = S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode);
387 mp = tp->t_mountp;
388 agcount = mp->m_maxagi;
389 if (S_ISDIR(mode))
390 pagno = xfs_ialloc_next_ag(mp);
391 else {
392 pagno = XFS_INO_TO_AGNO(mp, parent);
393 if (pagno >= agcount)
394 pagno = 0;
395 }
396 ASSERT(pagno < agcount);
397 /*
398 * Loop through allocation groups, looking for one with a little
399 * free space in it. Note we don't look for free inodes, exactly.
400 * Instead, we include whether there is a need to allocate inodes
401 * to mean that blocks must be allocated for them,
402 * if none are currently free.
403 */
404 agno = pagno;
405 flags = XFS_ALLOC_FLAG_TRYLOCK;
406 down_read(&mp->m_peraglock);
407 for (;;) {
408 pag = &mp->m_perag[agno];
409 if (!pag->pagi_init) {
410 if (xfs_ialloc_read_agi(mp, tp, agno, &agbp)) {
411 agbp = NULL;
412 goto nextag;
413 }
414 } else
415 agbp = NULL;
416
417 if (!pag->pagi_inodeok) {
418 xfs_ialloc_next_ag(mp);
419 goto unlock_nextag;
420 }
421
422 /*
423 * Is there enough free space for the file plus a block
424 * of inodes (if we need to allocate some)?
425 */
426 ineed = pag->pagi_freecount ? 0 : XFS_IALLOC_BLOCKS(mp);
427 if (ineed && !pag->pagf_init) {
428 if (agbp == NULL &&
429 xfs_ialloc_read_agi(mp, tp, agno, &agbp)) {
430 agbp = NULL;
431 goto nextag;
432 }
433 (void)xfs_alloc_pagf_init(mp, tp, agno, flags);
434 }
435 if (!ineed || pag->pagf_init) {
436 if (ineed && !(longest = pag->pagf_longest))
437 longest = pag->pagf_flcount > 0;
438 if (!ineed ||
439 (pag->pagf_freeblks >= needspace + ineed &&
440 longest >= ineed &&
441 okalloc)) {
442 if (agbp == NULL &&
443 xfs_ialloc_read_agi(mp, tp, agno, &agbp)) {
444 agbp = NULL;
445 goto nextag;
446 }
447 up_read(&mp->m_peraglock);
448 return agbp;
449 }
450 }
451 unlock_nextag:
452 if (agbp)
453 xfs_trans_brelse(tp, agbp);
454 nextag:
455 /*
456 * No point in iterating over the rest, if we're shutting
457 * down.
458 */
459 if (XFS_FORCED_SHUTDOWN(mp)) {
460 up_read(&mp->m_peraglock);
461 return NULL;
462 }
463 agno++;
464 if (agno >= agcount)
465 agno = 0;
466 if (agno == pagno) {
467 if (flags == 0) {
468 up_read(&mp->m_peraglock);
469 return NULL;
470 }
471 flags = 0;
472 }
473 }
474 }
475
476 /*
477 * Visible inode allocation functions.
478 */
479
480 /*
481 * Allocate an inode on disk.
482 * Mode is used to tell whether the new inode will need space, and whether
483 * it is a directory.
484 *
485 * The arguments IO_agbp and alloc_done are defined to work within
486 * the constraint of one allocation per transaction.
487 * xfs_dialloc() is designed to be called twice if it has to do an
488 * allocation to make more free inodes. On the first call,
489 * IO_agbp should be set to NULL. If an inode is available,
490 * i.e., xfs_dialloc() did not need to do an allocation, an inode
491 * number is returned. In this case, IO_agbp would be set to the
492 * current ag_buf and alloc_done set to false.
493 * If an allocation needed to be done, xfs_dialloc would return
494 * the current ag_buf in IO_agbp and set alloc_done to true.
495 * The caller should then commit the current transaction, allocate a new
496 * transaction, and call xfs_dialloc() again, passing in the previous
497 * value of IO_agbp. IO_agbp should be held across the transactions.
498 * Since the agbp is locked across the two calls, the second call is
499 * guaranteed to have a free inode available.
500 *
501 * Once we successfully pick an inode its number is returned and the
502 * on-disk data structures are updated. The inode itself is not read
503 * in, since doing so would break ordering constraints with xfs_reclaim.
504 */
505 int
506 xfs_dialloc(
507 xfs_trans_t *tp, /* transaction pointer */
508 xfs_ino_t parent, /* parent inode (directory) */
509 mode_t mode, /* mode bits for new inode */
510 int okalloc, /* ok to allocate more space */
511 xfs_buf_t **IO_agbp, /* in/out ag header's buffer */
512 boolean_t *alloc_done, /* true if we needed to replenish
513 inode freelist */
514 xfs_ino_t *inop) /* inode number allocated */
515 {
516 xfs_agnumber_t agcount; /* number of allocation groups */
517 xfs_buf_t *agbp; /* allocation group header's buffer */
518 xfs_agnumber_t agno; /* allocation group number */
519 xfs_agi_t *agi; /* allocation group header structure */
520 xfs_btree_cur_t *cur; /* inode allocation btree cursor */
521 int error; /* error return value */
522 int i; /* result code */
523 int ialloced; /* inode allocation status */
524 int noroom = 0; /* no space for inode blk allocation */
525 xfs_ino_t ino; /* fs-relative inode to be returned */
526 /* REFERENCED */
527 int j; /* result code */
528 xfs_mount_t *mp; /* file system mount structure */
529 int offset; /* index of inode in chunk */
530 xfs_agino_t pagino; /* parent's a.g. relative inode # */
531 xfs_agnumber_t pagno; /* parent's allocation group number */
532 xfs_inobt_rec_incore_t rec; /* inode allocation record */
533 xfs_agnumber_t tagno; /* testing allocation group number */
534 xfs_btree_cur_t *tcur; /* temp cursor */
535 xfs_inobt_rec_incore_t trec; /* temp inode allocation record */
536
537
538 if (*IO_agbp == NULL) {
539 /*
540 * We do not have an agbp, so select an initial allocation
541 * group for inode allocation.
542 */
543 agbp = xfs_ialloc_ag_select(tp, parent, mode, okalloc);
544 /*
545 * Couldn't find an allocation group satisfying the
546 * criteria, give up.
547 */
548 if (!agbp) {
549 *inop = NULLFSINO;
550 return 0;
551 }
552 agi = XFS_BUF_TO_AGI(agbp);
553 ASSERT(be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC);
554 } else {
555 /*
556 * Continue where we left off before. In this case, we
557 * know that the allocation group has free inodes.
558 */
559 agbp = *IO_agbp;
560 agi = XFS_BUF_TO_AGI(agbp);
561 ASSERT(be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC);
562 ASSERT(be32_to_cpu(agi->agi_freecount) > 0);
563 }
564 mp = tp->t_mountp;
565 agcount = mp->m_sb.sb_agcount;
566 agno = be32_to_cpu(agi->agi_seqno);
567 tagno = agno;
568 pagno = XFS_INO_TO_AGNO(mp, parent);
569 pagino = XFS_INO_TO_AGINO(mp, parent);
570
571 /*
572 * If we have already hit the ceiling of inode blocks then clear
573 * okalloc so we scan all available agi structures for a free
574 * inode.
575 */
576
577 if (mp->m_maxicount &&
578 mp->m_sb.sb_icount + XFS_IALLOC_INODES(mp) > mp->m_maxicount) {
579 noroom = 1;
580 okalloc = 0;
581 }
582
583 /*
584 * Loop until we find an allocation group that either has free inodes
585 * or in which we can allocate some inodes. Iterate through the
586 * allocation groups upward, wrapping at the end.
587 */
588 *alloc_done = B_FALSE;
589 while (!agi->agi_freecount) {
590 /*
591 * Don't do anything if we're not supposed to allocate
592 * any blocks, just go on to the next ag.
593 */
594 if (okalloc) {
595 /*
596 * Try to allocate some new inodes in the allocation
597 * group.
598 */
599 if ((error = xfs_ialloc_ag_alloc(tp, agbp, &ialloced))) {
600 xfs_trans_brelse(tp, agbp);
601 if (error == ENOSPC) {
602 *inop = NULLFSINO;
603 return 0;
604 } else
605 return error;
606 }
607 if (ialloced) {
608 /*
609 * We successfully allocated some inodes, return
610 * the current context to the caller so that it
611 * can commit the current transaction and call
612 * us again where we left off.
613 */
614 ASSERT(be32_to_cpu(agi->agi_freecount) > 0);
615 *alloc_done = B_TRUE;
616 *IO_agbp = agbp;
617 *inop = NULLFSINO;
618 return 0;
619 }
620 }
621 /*
622 * If it failed, give up on this ag.
623 */
624 xfs_trans_brelse(tp, agbp);
625 /*
626 * Go on to the next ag: get its ag header.
627 */
628 nextag:
629 if (++tagno == agcount)
630 tagno = 0;
631 if (tagno == agno) {
632 *inop = NULLFSINO;
633 return noroom ? ENOSPC : 0;
634 }
635 down_read(&mp->m_peraglock);
636 if (mp->m_perag[tagno].pagi_inodeok == 0) {
637 up_read(&mp->m_peraglock);
638 goto nextag;
639 }
640 error = xfs_ialloc_read_agi(mp, tp, tagno, &agbp);
641 up_read(&mp->m_peraglock);
642 if (error)
643 goto nextag;
644 agi = XFS_BUF_TO_AGI(agbp);
645 ASSERT(be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC);
646 }
647 /*
648 * Here with an allocation group that has a free inode.
649 * Reset agno since we may have chosen a new ag in the
650 * loop above.
651 */
652 agno = tagno;
653 *IO_agbp = NULL;
654 cur = xfs_btree_init_cursor(mp, tp, agbp, be32_to_cpu(agi->agi_seqno),
655 XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
656 /*
657 * If pagino is 0 (this is the root inode allocation) use newino.
658 * This must work because we've just allocated some.
659 */
660 if (!pagino)
661 pagino = be32_to_cpu(agi->agi_newino);
662 #ifdef DEBUG
663 if (cur->bc_nlevels == 1) {
664 int freecount = 0;
665
666 if ((error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &i)))
667 goto error0;
668 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
669 do {
670 if ((error = xfs_inobt_get_rec(cur, &rec.ir_startino,
671 &rec.ir_freecount, &rec.ir_free, &i)))
672 goto error0;
673 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
674 freecount += rec.ir_freecount;
675 if ((error = xfs_inobt_increment(cur, 0, &i)))
676 goto error0;
677 } while (i == 1);
678
679 ASSERT(freecount == be32_to_cpu(agi->agi_freecount) ||
680 XFS_FORCED_SHUTDOWN(mp));
681 }
682 #endif
683 /*
684 * If in the same a.g. as the parent, try to get near the parent.
685 */
686 if (pagno == agno) {
687 if ((error = xfs_inobt_lookup_le(cur, pagino, 0, 0, &i)))
688 goto error0;
689 if (i != 0 &&
690 (error = xfs_inobt_get_rec(cur, &rec.ir_startino,
691 &rec.ir_freecount, &rec.ir_free, &j)) == 0 &&
692 j == 1 &&
693 rec.ir_freecount > 0) {
694 /*
695 * Found a free inode in the same chunk
696 * as parent, done.
697 */
698 }
699 /*
700 * In the same a.g. as parent, but parent's chunk is full.
701 */
702 else {
703 int doneleft; /* done, to the left */
704 int doneright; /* done, to the right */
705
706 if (error)
707 goto error0;
708 ASSERT(i == 1);
709 ASSERT(j == 1);
710 /*
711 * Duplicate the cursor, search left & right
712 * simultaneously.
713 */
714 if ((error = xfs_btree_dup_cursor(cur, &tcur)))
715 goto error0;
716 /*
717 * Search left with tcur, back up 1 record.
718 */
719 if ((error = xfs_inobt_decrement(tcur, 0, &i)))
720 goto error1;
721 doneleft = !i;
722 if (!doneleft) {
723 if ((error = xfs_inobt_get_rec(tcur,
724 &trec.ir_startino,
725 &trec.ir_freecount,
726 &trec.ir_free, &i)))
727 goto error1;
728 XFS_WANT_CORRUPTED_GOTO(i == 1, error1);
729 }
730 /*
731 * Search right with cur, go forward 1 record.
732 */
733 if ((error = xfs_inobt_increment(cur, 0, &i)))
734 goto error1;
735 doneright = !i;
736 if (!doneright) {
737 if ((error = xfs_inobt_get_rec(cur,
738 &rec.ir_startino,
739 &rec.ir_freecount,
740 &rec.ir_free, &i)))
741 goto error1;
742 XFS_WANT_CORRUPTED_GOTO(i == 1, error1);
743 }
744 /*
745 * Loop until we find the closest inode chunk
746 * with a free one.
747 */
748 while (!doneleft || !doneright) {
749 int useleft; /* using left inode
750 chunk this time */
751
752 /*
753 * Figure out which block is closer,
754 * if both are valid.
755 */
756 if (!doneleft && !doneright)
757 useleft =
758 pagino -
759 (trec.ir_startino +
760 XFS_INODES_PER_CHUNK - 1) <
761 rec.ir_startino - pagino;
762 else
763 useleft = !doneleft;
764 /*
765 * If checking the left, does it have
766 * free inodes?
767 */
768 if (useleft && trec.ir_freecount) {
769 /*
770 * Yes, set it up as the chunk to use.
771 */
772 rec = trec;
773 xfs_btree_del_cursor(cur,
774 XFS_BTREE_NOERROR);
775 cur = tcur;
776 break;
777 }
778 /*
779 * If checking the right, does it have
780 * free inodes?
781 */
782 if (!useleft && rec.ir_freecount) {
783 /*
784 * Yes, it's already set up.
785 */
786 xfs_btree_del_cursor(tcur,
787 XFS_BTREE_NOERROR);
788 break;
789 }
790 /*
791 * If used the left, get another one
792 * further left.
793 */
794 if (useleft) {
795 if ((error = xfs_inobt_decrement(tcur, 0,
796 &i)))
797 goto error1;
798 doneleft = !i;
799 if (!doneleft) {
800 if ((error = xfs_inobt_get_rec(
801 tcur,
802 &trec.ir_startino,
803 &trec.ir_freecount,
804 &trec.ir_free, &i)))
805 goto error1;
806 XFS_WANT_CORRUPTED_GOTO(i == 1,
807 error1);
808 }
809 }
810 /*
811 * If used the right, get another one
812 * further right.
813 */
814 else {
815 if ((error = xfs_inobt_increment(cur, 0,
816 &i)))
817 goto error1;
818 doneright = !i;
819 if (!doneright) {
820 if ((error = xfs_inobt_get_rec(
821 cur,
822 &rec.ir_startino,
823 &rec.ir_freecount,
824 &rec.ir_free, &i)))
825 goto error1;
826 XFS_WANT_CORRUPTED_GOTO(i == 1,
827 error1);
828 }
829 }
830 }
831 ASSERT(!doneleft || !doneright);
832 }
833 }
834 /*
835 * In a different a.g. from the parent.
836 * See if the most recently allocated block has any free.
837 */
838 else if (be32_to_cpu(agi->agi_newino) != NULLAGINO) {
839 if ((error = xfs_inobt_lookup_eq(cur,
840 be32_to_cpu(agi->agi_newino), 0, 0, &i)))
841 goto error0;
842 if (i == 1 &&
843 (error = xfs_inobt_get_rec(cur, &rec.ir_startino,
844 &rec.ir_freecount, &rec.ir_free, &j)) == 0 &&
845 j == 1 &&
846 rec.ir_freecount > 0) {
847 /*
848 * The last chunk allocated in the group still has
849 * a free inode.
850 */
851 }
852 /*
853 * None left in the last group, search the whole a.g.
854 */
855 else {
856 if (error)
857 goto error0;
858 if ((error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &i)))
859 goto error0;
860 ASSERT(i == 1);
861 for (;;) {
862 if ((error = xfs_inobt_get_rec(cur,
863 &rec.ir_startino,
864 &rec.ir_freecount, &rec.ir_free,
865 &i)))
866 goto error0;
867 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
868 if (rec.ir_freecount > 0)
869 break;
870 if ((error = xfs_inobt_increment(cur, 0, &i)))
871 goto error0;
872 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
873 }
874 }
875 }
876 offset = XFS_IALLOC_FIND_FREE(&rec.ir_free);
877 ASSERT(offset >= 0);
878 ASSERT(offset < XFS_INODES_PER_CHUNK);
879 ASSERT((XFS_AGINO_TO_OFFSET(mp, rec.ir_startino) %
880 XFS_INODES_PER_CHUNK) == 0);
881 ino = XFS_AGINO_TO_INO(mp, agno, rec.ir_startino + offset);
882 XFS_INOBT_CLR_FREE(&rec, offset);
883 rec.ir_freecount--;
884 if ((error = xfs_inobt_update(cur, rec.ir_startino, rec.ir_freecount,
885 rec.ir_free)))
886 goto error0;
887 be32_add(&agi->agi_freecount, -1);
888 xfs_ialloc_log_agi(tp, agbp, XFS_AGI_FREECOUNT);
889 down_read(&mp->m_peraglock);
890 mp->m_perag[tagno].pagi_freecount--;
891 up_read(&mp->m_peraglock);
892 #ifdef DEBUG
893 if (cur->bc_nlevels == 1) {
894 int freecount = 0;
895
896 if ((error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &i)))
897 goto error0;
898 do {
899 if ((error = xfs_inobt_get_rec(cur, &rec.ir_startino,
900 &rec.ir_freecount, &rec.ir_free, &i)))
901 goto error0;
902 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
903 freecount += rec.ir_freecount;
904 if ((error = xfs_inobt_increment(cur, 0, &i)))
905 goto error0;
906 } while (i == 1);
907 ASSERT(freecount == be32_to_cpu(agi->agi_freecount) ||
908 XFS_FORCED_SHUTDOWN(mp));
909 }
910 #endif
911 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
912 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, -1);
913 *inop = ino;
914 return 0;
915 error1:
916 xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
917 error0:
918 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
919 return error;
920 }
921
922 /*
923 * Free disk inode. Carefully avoids touching the incore inode, all
924 * manipulations incore are the caller's responsibility.
925 * The on-disk inode is not changed by this operation, only the
926 * btree (free inode mask) is changed.
927 */
928 int
929 xfs_difree(
930 xfs_trans_t *tp, /* transaction pointer */
931 xfs_ino_t inode, /* inode to be freed */
932 xfs_bmap_free_t *flist, /* extents to free */
933 int *delete, /* set if inode cluster was deleted */
934 xfs_ino_t *first_ino) /* first inode in deleted cluster */
935 {
936 /* REFERENCED */
937 xfs_agblock_t agbno; /* block number containing inode */
938 xfs_buf_t *agbp; /* buffer containing allocation group header */
939 xfs_agino_t agino; /* inode number relative to allocation group */
940 xfs_agnumber_t agno; /* allocation group number */
941 xfs_agi_t *agi; /* allocation group header */
942 xfs_btree_cur_t *cur; /* inode btree cursor */
943 int error; /* error return value */
944 int i; /* result code */
945 int ilen; /* inodes in an inode cluster */
946 xfs_mount_t *mp; /* mount structure for filesystem */
947 int off; /* offset of inode in inode chunk */
948 xfs_inobt_rec_incore_t rec; /* btree record */
949
950 mp = tp->t_mountp;
951
952 /*
953 * Break up inode number into its components.
954 */
955 agno = XFS_INO_TO_AGNO(mp, inode);
956 if (agno >= mp->m_sb.sb_agcount) {
957 cmn_err(CE_WARN,
958 "xfs_difree: agno >= mp->m_sb.sb_agcount (%d >= %d) on %s. Returning EINVAL.",
959 agno, mp->m_sb.sb_agcount, mp->m_fsname);
960 ASSERT(0);
961 return XFS_ERROR(EINVAL);
962 }
963 agino = XFS_INO_TO_AGINO(mp, inode);
964 if (inode != XFS_AGINO_TO_INO(mp, agno, agino)) {
965 cmn_err(CE_WARN,
966 "xfs_difree: inode != XFS_AGINO_TO_INO() "
967 "(%llu != %llu) on %s. Returning EINVAL.",
968 (unsigned long long)inode,
969 (unsigned long long)XFS_AGINO_TO_INO(mp, agno, agino),
970 mp->m_fsname);
971 ASSERT(0);
972 return XFS_ERROR(EINVAL);
973 }
974 agbno = XFS_AGINO_TO_AGBNO(mp, agino);
975 if (agbno >= mp->m_sb.sb_agblocks) {
976 cmn_err(CE_WARN,
977 "xfs_difree: agbno >= mp->m_sb.sb_agblocks (%d >= %d) on %s. Returning EINVAL.",
978 agbno, mp->m_sb.sb_agblocks, mp->m_fsname);
979 ASSERT(0);
980 return XFS_ERROR(EINVAL);
981 }
982 /*
983 * Get the allocation group header.
984 */
985 down_read(&mp->m_peraglock);
986 error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);
987 up_read(&mp->m_peraglock);
988 if (error) {
989 cmn_err(CE_WARN,
990 "xfs_difree: xfs_ialloc_read_agi() returned an error %d on %s. Returning error.",
991 error, mp->m_fsname);
992 return error;
993 }
994 agi = XFS_BUF_TO_AGI(agbp);
995 ASSERT(be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC);
996 ASSERT(agbno < be32_to_cpu(agi->agi_length));
997 /*
998 * Initialize the cursor.
999 */
1000 cur = xfs_btree_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_INO,
1001 (xfs_inode_t *)0, 0);
1002 #ifdef DEBUG
1003 if (cur->bc_nlevels == 1) {
1004 int freecount = 0;
1005
1006 if ((error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &i)))
1007 goto error0;
1008 do {
1009 if ((error = xfs_inobt_get_rec(cur, &rec.ir_startino,
1010 &rec.ir_freecount, &rec.ir_free, &i)))
1011 goto error0;
1012 if (i) {
1013 freecount += rec.ir_freecount;
1014 if ((error = xfs_inobt_increment(cur, 0, &i)))
1015 goto error0;
1016 }
1017 } while (i == 1);
1018 ASSERT(freecount == be32_to_cpu(agi->agi_freecount) ||
1019 XFS_FORCED_SHUTDOWN(mp));
1020 }
1021 #endif
1022 /*
1023 * Look for the entry describing this inode.
1024 */
1025 if ((error = xfs_inobt_lookup_le(cur, agino, 0, 0, &i))) {
1026 cmn_err(CE_WARN,
1027 "xfs_difree: xfs_inobt_lookup_le returned() an error %d on %s. Returning error.",
1028 error, mp->m_fsname);
1029 goto error0;
1030 }
1031 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
1032 if ((error = xfs_inobt_get_rec(cur, &rec.ir_startino, &rec.ir_freecount,
1033 &rec.ir_free, &i))) {
1034 cmn_err(CE_WARN,
1035 "xfs_difree: xfs_inobt_get_rec() returned an error %d on %s. Returning error.",
1036 error, mp->m_fsname);
1037 goto error0;
1038 }
1039 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
1040 /*
1041 * Get the offset in the inode chunk.
1042 */
1043 off = agino - rec.ir_startino;
1044 ASSERT(off >= 0 && off < XFS_INODES_PER_CHUNK);
1045 ASSERT(!XFS_INOBT_IS_FREE(&rec, off));
1046 /*
1047 * Mark the inode free & increment the count.
1048 */
1049 XFS_INOBT_SET_FREE(&rec, off);
1050 rec.ir_freecount++;
1051
1052 /*
1053 * When an inode cluster is free, it becomes eligible for removal
1054 */
1055 if ((mp->m_flags & XFS_MOUNT_IDELETE) &&
1056 (rec.ir_freecount == XFS_IALLOC_INODES(mp))) {
1057
1058 *delete = 1;
1059 *first_ino = XFS_AGINO_TO_INO(mp, agno, rec.ir_startino);
1060
1061 /*
1062 * Remove the inode cluster from the AGI B+Tree, adjust the
1063 * AGI and Superblock inode counts, and mark the disk space
1064 * to be freed when the transaction is committed.
1065 */
1066 ilen = XFS_IALLOC_INODES(mp);
1067 be32_add(&agi->agi_count, -ilen);
1068 be32_add(&agi->agi_freecount, -(ilen - 1));
1069 xfs_ialloc_log_agi(tp, agbp, XFS_AGI_COUNT | XFS_AGI_FREECOUNT);
1070 down_read(&mp->m_peraglock);
1071 mp->m_perag[agno].pagi_freecount -= ilen - 1;
1072 up_read(&mp->m_peraglock);
1073 xfs_trans_mod_sb(tp, XFS_TRANS_SB_ICOUNT, -ilen);
1074 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, -(ilen - 1));
1075
1076 if ((error = xfs_inobt_delete(cur, &i))) {
1077 cmn_err(CE_WARN, "xfs_difree: xfs_inobt_delete returned an error %d on %s.\n",
1078 error, mp->m_fsname);
1079 goto error0;
1080 }
1081
1082 xfs_bmap_add_free(XFS_AGB_TO_FSB(mp,
1083 agno, XFS_INO_TO_AGBNO(mp,rec.ir_startino)),
1084 XFS_IALLOC_BLOCKS(mp), flist, mp);
1085 } else {
1086 *delete = 0;
1087
1088 if ((error = xfs_inobt_update(cur, rec.ir_startino, rec.ir_freecount, rec.ir_free))) {
1089 cmn_err(CE_WARN,
1090 "xfs_difree: xfs_inobt_update() returned an error %d on %s. Returning error.",
1091 error, mp->m_fsname);
1092 goto error0;
1093 }
1094 /*
1095 * Change the inode free counts and log the ag/sb changes.
1096 */
1097 be32_add(&agi->agi_freecount, 1);
1098 xfs_ialloc_log_agi(tp, agbp, XFS_AGI_FREECOUNT);
1099 down_read(&mp->m_peraglock);
1100 mp->m_perag[agno].pagi_freecount++;
1101 up_read(&mp->m_peraglock);
1102 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, 1);
1103 }
1104
1105 #ifdef DEBUG
1106 if (cur->bc_nlevels == 1) {
1107 int freecount = 0;
1108
1109 if ((error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &i)))
1110 goto error0;
1111 do {
1112 if ((error = xfs_inobt_get_rec(cur,
1113 &rec.ir_startino,
1114 &rec.ir_freecount,
1115 &rec.ir_free, &i)))
1116 goto error0;
1117 if (i) {
1118 freecount += rec.ir_freecount;
1119 if ((error = xfs_inobt_increment(cur, 0, &i)))
1120 goto error0;
1121 }
1122 } while (i == 1);
1123 ASSERT(freecount == be32_to_cpu(agi->agi_freecount) ||
1124 XFS_FORCED_SHUTDOWN(mp));
1125 }
1126 #endif
1127 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
1128 return 0;
1129
1130 error0:
1131 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
1132 return error;
1133 }
1134
1135 /*
1136 * Return the location of the inode in bno/off, for mapping it into a buffer.
1137 */
1138 /*ARGSUSED*/
1139 int
1140 xfs_dilocate(
1141 xfs_mount_t *mp, /* file system mount structure */
1142 xfs_trans_t *tp, /* transaction pointer */
1143 xfs_ino_t ino, /* inode to locate */
1144 xfs_fsblock_t *bno, /* output: block containing inode */
1145 int *len, /* output: num blocks in inode cluster */
1146 int *off, /* output: index in block of inode */
1147 uint flags) /* flags concerning inode lookup */
1148 {
1149 xfs_agblock_t agbno; /* block number of inode in the alloc group */
1150 xfs_buf_t *agbp; /* agi buffer */
1151 xfs_agino_t agino; /* inode number within alloc group */
1152 xfs_agnumber_t agno; /* allocation group number */
1153 int blks_per_cluster; /* num blocks per inode cluster */
1154 xfs_agblock_t chunk_agbno; /* first block in inode chunk */
1155 xfs_agino_t chunk_agino; /* first agino in inode chunk */
1156 __int32_t chunk_cnt; /* count of free inodes in chunk */
1157 xfs_inofree_t chunk_free; /* mask of free inodes in chunk */
1158 xfs_agblock_t cluster_agbno; /* first block in inode cluster */
1159 xfs_btree_cur_t *cur; /* inode btree cursor */
1160 int error; /* error code */
1161 int i; /* temp state */
1162 int offset; /* index of inode in its buffer */
1163 int offset_agbno; /* blks from chunk start to inode */
1164
1165 ASSERT(ino != NULLFSINO);
1166 /*
1167 * Split up the inode number into its parts.
1168 */
1169 agno = XFS_INO_TO_AGNO(mp, ino);
1170 agino = XFS_INO_TO_AGINO(mp, ino);
1171 agbno = XFS_AGINO_TO_AGBNO(mp, agino);
1172 if (agno >= mp->m_sb.sb_agcount || agbno >= mp->m_sb.sb_agblocks ||
1173 ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
1174 #ifdef DEBUG
1175 /* no diagnostics for bulkstat, ino comes from userspace */
1176 if (flags & XFS_IMAP_BULKSTAT)
1177 return XFS_ERROR(EINVAL);
1178 if (agno >= mp->m_sb.sb_agcount) {
1179 xfs_fs_cmn_err(CE_ALERT, mp,
1180 "xfs_dilocate: agno (%d) >= "
1181 "mp->m_sb.sb_agcount (%d)",
1182 agno, mp->m_sb.sb_agcount);
1183 }
1184 if (agbno >= mp->m_sb.sb_agblocks) {
1185 xfs_fs_cmn_err(CE_ALERT, mp,
1186 "xfs_dilocate: agbno (0x%llx) >= "
1187 "mp->m_sb.sb_agblocks (0x%lx)",
1188 (unsigned long long) agbno,
1189 (unsigned long) mp->m_sb.sb_agblocks);
1190 }
1191 if (ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
1192 xfs_fs_cmn_err(CE_ALERT, mp,
1193 "xfs_dilocate: ino (0x%llx) != "
1194 "XFS_AGINO_TO_INO(mp, agno, agino) "
1195 "(0x%llx)",
1196 ino, XFS_AGINO_TO_INO(mp, agno, agino));
1197 }
1198 xfs_stack_trace();
1199 #endif /* DEBUG */
1200 return XFS_ERROR(EINVAL);
1201 }
1202 if ((mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp)) ||
1203 !(flags & XFS_IMAP_LOOKUP)) {
1204 offset = XFS_INO_TO_OFFSET(mp, ino);
1205 ASSERT(offset < mp->m_sb.sb_inopblock);
1206 *bno = XFS_AGB_TO_FSB(mp, agno, agbno);
1207 *off = offset;
1208 *len = 1;
1209 return 0;
1210 }
1211 blks_per_cluster = XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_blocklog;
1212 if (*bno != NULLFSBLOCK) {
1213 offset = XFS_INO_TO_OFFSET(mp, ino);
1214 ASSERT(offset < mp->m_sb.sb_inopblock);
1215 cluster_agbno = XFS_FSB_TO_AGBNO(mp, *bno);
1216 *off = ((agbno - cluster_agbno) * mp->m_sb.sb_inopblock) +
1217 offset;
1218 *len = blks_per_cluster;
1219 return 0;
1220 }
1221 if (mp->m_inoalign_mask) {
1222 offset_agbno = agbno & mp->m_inoalign_mask;
1223 chunk_agbno = agbno - offset_agbno;
1224 } else {
1225 down_read(&mp->m_peraglock);
1226 error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);
1227 up_read(&mp->m_peraglock);
1228 if (error) {
1229 #ifdef DEBUG
1230 xfs_fs_cmn_err(CE_ALERT, mp, "xfs_dilocate: "
1231 "xfs_ialloc_read_agi() returned "
1232 "error %d, agno %d",
1233 error, agno);
1234 #endif /* DEBUG */
1235 return error;
1236 }
1237 cur = xfs_btree_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_INO,
1238 (xfs_inode_t *)0, 0);
1239 if ((error = xfs_inobt_lookup_le(cur, agino, 0, 0, &i))) {
1240 #ifdef DEBUG
1241 xfs_fs_cmn_err(CE_ALERT, mp, "xfs_dilocate: "
1242 "xfs_inobt_lookup_le() failed");
1243 #endif /* DEBUG */
1244 goto error0;
1245 }
1246 if ((error = xfs_inobt_get_rec(cur, &chunk_agino, &chunk_cnt,
1247 &chunk_free, &i))) {
1248 #ifdef DEBUG
1249 xfs_fs_cmn_err(CE_ALERT, mp, "xfs_dilocate: "
1250 "xfs_inobt_get_rec() failed");
1251 #endif /* DEBUG */
1252 goto error0;
1253 }
1254 if (i == 0) {
1255 #ifdef DEBUG
1256 xfs_fs_cmn_err(CE_ALERT, mp, "xfs_dilocate: "
1257 "xfs_inobt_get_rec() failed");
1258 #endif /* DEBUG */
1259 error = XFS_ERROR(EINVAL);
1260 }
1261 xfs_trans_brelse(tp, agbp);
1262 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
1263 if (error)
1264 return error;
1265 chunk_agbno = XFS_AGINO_TO_AGBNO(mp, chunk_agino);
1266 offset_agbno = agbno - chunk_agbno;
1267 }
1268 ASSERT(agbno >= chunk_agbno);
1269 cluster_agbno = chunk_agbno +
1270 ((offset_agbno / blks_per_cluster) * blks_per_cluster);
1271 offset = ((agbno - cluster_agbno) * mp->m_sb.sb_inopblock) +
1272 XFS_INO_TO_OFFSET(mp, ino);
1273 *bno = XFS_AGB_TO_FSB(mp, agno, cluster_agbno);
1274 *off = offset;
1275 *len = blks_per_cluster;
1276 return 0;
1277 error0:
1278 xfs_trans_brelse(tp, agbp);
1279 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
1280 return error;
1281 }
1282
1283 /*
1284 * Compute and fill in value of m_in_maxlevels.
1285 */
1286 void
1287 xfs_ialloc_compute_maxlevels(
1288 xfs_mount_t *mp) /* file system mount structure */
1289 {
1290 int level;
1291 uint maxblocks;
1292 uint maxleafents;
1293 int minleafrecs;
1294 int minnoderecs;
1295
1296 maxleafents = (1LL << XFS_INO_AGINO_BITS(mp)) >>
1297 XFS_INODES_PER_CHUNK_LOG;
1298 minleafrecs = mp->m_alloc_mnr[0];
1299 minnoderecs = mp->m_alloc_mnr[1];
1300 maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
1301 for (level = 1; maxblocks > 1; level++)
1302 maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
1303 mp->m_in_maxlevels = level;
1304 }
1305
1306 /*
1307 * Log specified fields for the ag hdr (inode section)
1308 */
1309 void
1310 xfs_ialloc_log_agi(
1311 xfs_trans_t *tp, /* transaction pointer */
1312 xfs_buf_t *bp, /* allocation group header buffer */
1313 int fields) /* bitmask of fields to log */
1314 {
1315 int first; /* first byte number */
1316 int last; /* last byte number */
1317 static const short offsets[] = { /* field starting offsets */
1318 /* keep in sync with bit definitions */
1319 offsetof(xfs_agi_t, agi_magicnum),
1320 offsetof(xfs_agi_t, agi_versionnum),
1321 offsetof(xfs_agi_t, agi_seqno),
1322 offsetof(xfs_agi_t, agi_length),
1323 offsetof(xfs_agi_t, agi_count),
1324 offsetof(xfs_agi_t, agi_root),
1325 offsetof(xfs_agi_t, agi_level),
1326 offsetof(xfs_agi_t, agi_freecount),
1327 offsetof(xfs_agi_t, agi_newino),
1328 offsetof(xfs_agi_t, agi_dirino),
1329 offsetof(xfs_agi_t, agi_unlinked),
1330 sizeof(xfs_agi_t)
1331 };
1332 #ifdef DEBUG
1333 xfs_agi_t *agi; /* allocation group header */
1334
1335 agi = XFS_BUF_TO_AGI(bp);
1336 ASSERT(be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC);
1337 #endif
1338 /*
1339 * Compute byte offsets for the first and last fields.
1340 */
1341 xfs_btree_offsets(fields, offsets, XFS_AGI_NUM_BITS, &first, &last);
1342 /*
1343 * Log the allocation group inode header buffer.
1344 */
1345 xfs_trans_log_buf(tp, bp, first, last);
1346 }
1347
1348 /*
1349 * Read in the allocation group header (inode allocation section)
1350 */
1351 int
1352 xfs_ialloc_read_agi(
1353 xfs_mount_t *mp, /* file system mount structure */
1354 xfs_trans_t *tp, /* transaction pointer */
1355 xfs_agnumber_t agno, /* allocation group number */
1356 xfs_buf_t **bpp) /* allocation group hdr buf */
1357 {
1358 xfs_agi_t *agi; /* allocation group header */
1359 int agi_ok; /* agi is consistent */
1360 xfs_buf_t *bp; /* allocation group hdr buf */
1361 xfs_perag_t *pag; /* per allocation group data */
1362 int error;
1363
1364 ASSERT(agno != NULLAGNUMBER);
1365 error = xfs_trans_read_buf(
1366 mp, tp, mp->m_ddev_targp,
1367 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
1368 XFS_FSS_TO_BB(mp, 1), 0, &bp);
1369 if (error)
1370 return error;
1371 ASSERT(bp && !XFS_BUF_GETERROR(bp));
1372
1373 /*
1374 * Validate the magic number of the agi block.
1375 */
1376 agi = XFS_BUF_TO_AGI(bp);
1377 agi_ok =
1378 be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC &&
1379 XFS_AGI_GOOD_VERSION(be32_to_cpu(agi->agi_versionnum));
1380 if (unlikely(XFS_TEST_ERROR(!agi_ok, mp, XFS_ERRTAG_IALLOC_READ_AGI,
1381 XFS_RANDOM_IALLOC_READ_AGI))) {
1382 XFS_CORRUPTION_ERROR("xfs_ialloc_read_agi", XFS_ERRLEVEL_LOW,
1383 mp, agi);
1384 xfs_trans_brelse(tp, bp);
1385 return XFS_ERROR(EFSCORRUPTED);
1386 }
1387 pag = &mp->m_perag[agno];
1388 if (!pag->pagi_init) {
1389 pag->pagi_freecount = be32_to_cpu(agi->agi_freecount);
1390 pag->pagi_init = 1;
1391 } else {
1392 /*
1393 * It's possible for these to be out of sync if
1394 * we are in the middle of a forced shutdown.
1395 */
1396 ASSERT(pag->pagi_freecount == be32_to_cpu(agi->agi_freecount) ||
1397 XFS_FORCED_SHUTDOWN(mp));
1398 }
1399
1400 #ifdef DEBUG
1401 {
1402 int i;
1403
1404 for (i = 0; i < XFS_AGI_UNLINKED_BUCKETS; i++)
1405 ASSERT(agi->agi_unlinked[i]);
1406 }
1407 #endif
1408
1409 XFS_BUF_SET_VTYPE_REF(bp, B_FS_AGI, XFS_AGI_REF);
1410 *bpp = bp;
1411 return 0;
1412 }
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