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_mount.h"
28 #include "xfs_bmap_btree.h"
29 #include "xfs_alloc_btree.h"
30 #include "xfs_ialloc_btree.h"
31 #include "xfs_dinode.h"
32 #include "xfs_inode.h"
33 #include "xfs_ialloc.h"
34 #include "xfs_itable.h"
35 #include "xfs_error.h"
36 #include "xfs_btree.h"
37 #include "xfs_trace.h"
38
39 STATIC int
xfs_internal_inum(xfs_mount_t * mp,xfs_ino_t ino)40 xfs_internal_inum(
41 xfs_mount_t *mp,
42 xfs_ino_t ino)
43 {
44 return (ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
45 (xfs_sb_version_hasquota(&mp->m_sb) &&
46 (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino)));
47 }
48
49 /*
50 * Return stat information for one inode.
51 * Return 0 if ok, else errno.
52 */
53 int
xfs_bulkstat_one_int(struct xfs_mount * mp,xfs_ino_t ino,void __user * buffer,int ubsize,bulkstat_one_fmt_pf formatter,int * ubused,int * stat)54 xfs_bulkstat_one_int(
55 struct xfs_mount *mp, /* mount point for filesystem */
56 xfs_ino_t ino, /* inode to get data for */
57 void __user *buffer, /* buffer to place output in */
58 int ubsize, /* size of buffer */
59 bulkstat_one_fmt_pf formatter, /* formatter, copy to user */
60 int *ubused, /* bytes used by me */
61 int *stat) /* BULKSTAT_RV_... */
62 {
63 struct xfs_icdinode *dic; /* dinode core info pointer */
64 struct xfs_inode *ip; /* incore inode pointer */
65 struct xfs_bstat *buf; /* return buffer */
66 int error = 0; /* error value */
67
68 *stat = BULKSTAT_RV_NOTHING;
69
70 if (!buffer || xfs_internal_inum(mp, ino))
71 return XFS_ERROR(EINVAL);
72
73 buf = kmem_alloc(sizeof(*buf), KM_SLEEP | KM_MAYFAIL);
74 if (!buf)
75 return XFS_ERROR(ENOMEM);
76
77 error = xfs_iget(mp, NULL, ino,
78 (XFS_IGET_DONTCACHE | XFS_IGET_UNTRUSTED),
79 XFS_ILOCK_SHARED, &ip);
80 if (error) {
81 *stat = BULKSTAT_RV_NOTHING;
82 goto out_free;
83 }
84
85 ASSERT(ip != NULL);
86 ASSERT(ip->i_imap.im_blkno != 0);
87
88 dic = &ip->i_d;
89
90 /* xfs_iget returns the following without needing
91 * further change.
92 */
93 buf->bs_nlink = dic->di_nlink;
94 buf->bs_projid_lo = dic->di_projid_lo;
95 buf->bs_projid_hi = dic->di_projid_hi;
96 buf->bs_ino = ino;
97 buf->bs_mode = dic->di_mode;
98 buf->bs_uid = dic->di_uid;
99 buf->bs_gid = dic->di_gid;
100 buf->bs_size = dic->di_size;
101 buf->bs_atime.tv_sec = dic->di_atime.t_sec;
102 buf->bs_atime.tv_nsec = dic->di_atime.t_nsec;
103 buf->bs_mtime.tv_sec = dic->di_mtime.t_sec;
104 buf->bs_mtime.tv_nsec = dic->di_mtime.t_nsec;
105 buf->bs_ctime.tv_sec = dic->di_ctime.t_sec;
106 buf->bs_ctime.tv_nsec = dic->di_ctime.t_nsec;
107 buf->bs_xflags = xfs_ip2xflags(ip);
108 buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
109 buf->bs_extents = dic->di_nextents;
110 buf->bs_gen = dic->di_gen;
111 memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
112 buf->bs_dmevmask = dic->di_dmevmask;
113 buf->bs_dmstate = dic->di_dmstate;
114 buf->bs_aextents = dic->di_anextents;
115 buf->bs_forkoff = XFS_IFORK_BOFF(ip);
116
117 switch (dic->di_format) {
118 case XFS_DINODE_FMT_DEV:
119 buf->bs_rdev = ip->i_df.if_u2.if_rdev;
120 buf->bs_blksize = BLKDEV_IOSIZE;
121 buf->bs_blocks = 0;
122 break;
123 case XFS_DINODE_FMT_LOCAL:
124 case XFS_DINODE_FMT_UUID:
125 buf->bs_rdev = 0;
126 buf->bs_blksize = mp->m_sb.sb_blocksize;
127 buf->bs_blocks = 0;
128 break;
129 case XFS_DINODE_FMT_EXTENTS:
130 case XFS_DINODE_FMT_BTREE:
131 buf->bs_rdev = 0;
132 buf->bs_blksize = mp->m_sb.sb_blocksize;
133 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
134 break;
135 }
136 xfs_iunlock(ip, XFS_ILOCK_SHARED);
137 IRELE(ip);
138
139 error = formatter(buffer, ubsize, ubused, buf);
140
141 if (!error)
142 *stat = BULKSTAT_RV_DIDONE;
143
144 out_free:
145 kmem_free(buf);
146 return error;
147 }
148
149 /* Return 0 on success or positive error */
150 STATIC int
xfs_bulkstat_one_fmt(void __user * ubuffer,int ubsize,int * ubused,const xfs_bstat_t * buffer)151 xfs_bulkstat_one_fmt(
152 void __user *ubuffer,
153 int ubsize,
154 int *ubused,
155 const xfs_bstat_t *buffer)
156 {
157 if (ubsize < sizeof(*buffer))
158 return XFS_ERROR(ENOMEM);
159 if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
160 return XFS_ERROR(EFAULT);
161 if (ubused)
162 *ubused = sizeof(*buffer);
163 return 0;
164 }
165
166 int
xfs_bulkstat_one(xfs_mount_t * mp,xfs_ino_t ino,void __user * buffer,int ubsize,int * ubused,int * stat)167 xfs_bulkstat_one(
168 xfs_mount_t *mp, /* mount point for filesystem */
169 xfs_ino_t ino, /* inode number to get data for */
170 void __user *buffer, /* buffer to place output in */
171 int ubsize, /* size of buffer */
172 int *ubused, /* bytes used by me */
173 int *stat) /* BULKSTAT_RV_... */
174 {
175 return xfs_bulkstat_one_int(mp, ino, buffer, ubsize,
176 xfs_bulkstat_one_fmt, ubused, stat);
177 }
178
179 #define XFS_BULKSTAT_UBLEFT(ubleft) ((ubleft) >= statstruct_size)
180
181 /*
182 * Return stat information in bulk (by-inode) for the filesystem.
183 */
184 int /* error status */
xfs_bulkstat(xfs_mount_t * mp,xfs_ino_t * lastinop,int * ubcountp,bulkstat_one_pf formatter,size_t statstruct_size,char __user * ubuffer,int * done)185 xfs_bulkstat(
186 xfs_mount_t *mp, /* mount point for filesystem */
187 xfs_ino_t *lastinop, /* last inode returned */
188 int *ubcountp, /* size of buffer/count returned */
189 bulkstat_one_pf formatter, /* func that'd fill a single buf */
190 size_t statstruct_size, /* sizeof struct filling */
191 char __user *ubuffer, /* buffer with inode stats */
192 int *done) /* 1 if there are more stats to get */
193 {
194 xfs_agblock_t agbno=0;/* allocation group block number */
195 xfs_buf_t *agbp; /* agi header buffer */
196 xfs_agi_t *agi; /* agi header data */
197 xfs_agino_t agino; /* inode # in allocation group */
198 xfs_agnumber_t agno; /* allocation group number */
199 int chunkidx; /* current index into inode chunk */
200 int clustidx; /* current index into inode cluster */
201 xfs_btree_cur_t *cur; /* btree cursor for ialloc btree */
202 int end_of_ag; /* set if we've seen the ag end */
203 int error; /* error code */
204 int fmterror;/* bulkstat formatter result */
205 int i; /* loop index */
206 int icount; /* count of inodes good in irbuf */
207 size_t irbsize; /* size of irec buffer in bytes */
208 xfs_ino_t ino; /* inode number (filesystem) */
209 xfs_inobt_rec_incore_t *irbp; /* current irec buffer pointer */
210 xfs_inobt_rec_incore_t *irbuf; /* start of irec buffer */
211 xfs_inobt_rec_incore_t *irbufend; /* end of good irec buffer entries */
212 xfs_ino_t lastino; /* last inode number returned */
213 int nbcluster; /* # of blocks in a cluster */
214 int nicluster; /* # of inodes in a cluster */
215 int nimask; /* mask for inode clusters */
216 int nirbuf; /* size of irbuf */
217 int rval; /* return value error code */
218 int tmp; /* result value from btree calls */
219 int ubcount; /* size of user's buffer */
220 int ubleft; /* bytes left in user's buffer */
221 char __user *ubufp; /* pointer into user's buffer */
222 int ubelem; /* spaces used in user's buffer */
223 int ubused; /* bytes used by formatter */
224 xfs_buf_t *bp; /* ptr to on-disk inode cluster buf */
225
226 /*
227 * Get the last inode value, see if there's nothing to do.
228 */
229 ino = (xfs_ino_t)*lastinop;
230 lastino = ino;
231 agno = XFS_INO_TO_AGNO(mp, ino);
232 agino = XFS_INO_TO_AGINO(mp, ino);
233 if (agno >= mp->m_sb.sb_agcount ||
234 ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
235 *done = 1;
236 *ubcountp = 0;
237 return 0;
238 }
239 if (!ubcountp || *ubcountp <= 0) {
240 return EINVAL;
241 }
242 ubcount = *ubcountp; /* statstruct's */
243 ubleft = ubcount * statstruct_size; /* bytes */
244 *ubcountp = ubelem = 0;
245 *done = 0;
246 fmterror = 0;
247 ubufp = ubuffer;
248 nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
249 mp->m_sb.sb_inopblock :
250 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
251 nimask = ~(nicluster - 1);
252 nbcluster = nicluster >> mp->m_sb.sb_inopblog;
253 irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4);
254 if (!irbuf)
255 return ENOMEM;
256
257 nirbuf = irbsize / sizeof(*irbuf);
258
259 /*
260 * Loop over the allocation groups, starting from the last
261 * inode returned; 0 means start of the allocation group.
262 */
263 rval = 0;
264 while (XFS_BULKSTAT_UBLEFT(ubleft) && agno < mp->m_sb.sb_agcount) {
265 cond_resched();
266 bp = NULL;
267 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
268 if (error) {
269 /*
270 * Skip this allocation group and go to the next one.
271 */
272 agno++;
273 agino = 0;
274 continue;
275 }
276 agi = XFS_BUF_TO_AGI(agbp);
277 /*
278 * Allocate and initialize a btree cursor for ialloc btree.
279 */
280 cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno);
281 irbp = irbuf;
282 irbufend = irbuf + nirbuf;
283 end_of_ag = 0;
284 /*
285 * If we're returning in the middle of an allocation group,
286 * we need to get the remainder of the chunk we're in.
287 */
288 if (agino > 0) {
289 xfs_inobt_rec_incore_t r;
290
291 /*
292 * Lookup the inode chunk that this inode lives in.
293 */
294 error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE,
295 &tmp);
296 if (!error && /* no I/O error */
297 tmp && /* lookup succeeded */
298 /* got the record, should always work */
299 !(error = xfs_inobt_get_rec(cur, &r, &i)) &&
300 i == 1 &&
301 /* this is the right chunk */
302 agino < r.ir_startino + XFS_INODES_PER_CHUNK &&
303 /* lastino was not last in chunk */
304 (chunkidx = agino - r.ir_startino + 1) <
305 XFS_INODES_PER_CHUNK &&
306 /* there are some left allocated */
307 xfs_inobt_maskn(chunkidx,
308 XFS_INODES_PER_CHUNK - chunkidx) &
309 ~r.ir_free) {
310 /*
311 * Grab the chunk record. Mark all the
312 * uninteresting inodes (because they're
313 * before our start point) free.
314 */
315 for (i = 0; i < chunkidx; i++) {
316 if (XFS_INOBT_MASK(i) & ~r.ir_free)
317 r.ir_freecount++;
318 }
319 r.ir_free |= xfs_inobt_maskn(0, chunkidx);
320 irbp->ir_startino = r.ir_startino;
321 irbp->ir_freecount = r.ir_freecount;
322 irbp->ir_free = r.ir_free;
323 irbp++;
324 agino = r.ir_startino + XFS_INODES_PER_CHUNK;
325 icount = XFS_INODES_PER_CHUNK - r.ir_freecount;
326 } else {
327 /*
328 * If any of those tests failed, bump the
329 * inode number (just in case).
330 */
331 agino++;
332 icount = 0;
333 }
334 /*
335 * In any case, increment to the next record.
336 */
337 if (!error)
338 error = xfs_btree_increment(cur, 0, &tmp);
339 } else {
340 /*
341 * Start of ag. Lookup the first inode chunk.
342 */
343 error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &tmp);
344 icount = 0;
345 }
346 /*
347 * Loop through inode btree records in this ag,
348 * until we run out of inodes or space in the buffer.
349 */
350 while (irbp < irbufend && icount < ubcount) {
351 xfs_inobt_rec_incore_t r;
352
353 /*
354 * Loop as long as we're unable to read the
355 * inode btree.
356 */
357 while (error) {
358 agino += XFS_INODES_PER_CHUNK;
359 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
360 be32_to_cpu(agi->agi_length))
361 break;
362 error = xfs_inobt_lookup(cur, agino,
363 XFS_LOOKUP_GE, &tmp);
364 cond_resched();
365 }
366 /*
367 * If ran off the end of the ag either with an error,
368 * or the normal way, set end and stop collecting.
369 */
370 if (error) {
371 end_of_ag = 1;
372 break;
373 }
374
375 error = xfs_inobt_get_rec(cur, &r, &i);
376 if (error || i == 0) {
377 end_of_ag = 1;
378 break;
379 }
380
381 /*
382 * If this chunk has any allocated inodes, save it.
383 * Also start read-ahead now for this chunk.
384 */
385 if (r.ir_freecount < XFS_INODES_PER_CHUNK) {
386 /*
387 * Loop over all clusters in the next chunk.
388 * Do a readahead if there are any allocated
389 * inodes in that cluster.
390 */
391 agbno = XFS_AGINO_TO_AGBNO(mp, r.ir_startino);
392 for (chunkidx = 0;
393 chunkidx < XFS_INODES_PER_CHUNK;
394 chunkidx += nicluster,
395 agbno += nbcluster) {
396 if (xfs_inobt_maskn(chunkidx, nicluster)
397 & ~r.ir_free)
398 xfs_btree_reada_bufs(mp, agno,
399 agbno, nbcluster);
400 }
401 irbp->ir_startino = r.ir_startino;
402 irbp->ir_freecount = r.ir_freecount;
403 irbp->ir_free = r.ir_free;
404 irbp++;
405 icount += XFS_INODES_PER_CHUNK - r.ir_freecount;
406 }
407 /*
408 * Set agino to after this chunk and bump the cursor.
409 */
410 agino = r.ir_startino + XFS_INODES_PER_CHUNK;
411 error = xfs_btree_increment(cur, 0, &tmp);
412 cond_resched();
413 }
414 /*
415 * Drop the btree buffers and the agi buffer.
416 * We can't hold any of the locks these represent
417 * when calling iget.
418 */
419 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
420 xfs_buf_relse(agbp);
421 /*
422 * Now format all the good inodes into the user's buffer.
423 */
424 irbufend = irbp;
425 for (irbp = irbuf;
426 irbp < irbufend && XFS_BULKSTAT_UBLEFT(ubleft); irbp++) {
427 /*
428 * Now process this chunk of inodes.
429 */
430 for (agino = irbp->ir_startino, chunkidx = clustidx = 0;
431 XFS_BULKSTAT_UBLEFT(ubleft) &&
432 irbp->ir_freecount < XFS_INODES_PER_CHUNK;
433 chunkidx++, clustidx++, agino++) {
434 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
435 /*
436 * Recompute agbno if this is the
437 * first inode of the cluster.
438 *
439 * Careful with clustidx. There can be
440 * multiple clusters per chunk, a single
441 * cluster per chunk or a cluster that has
442 * inodes represented from several different
443 * chunks (if blocksize is large).
444 *
445 * Because of this, the starting clustidx is
446 * initialized to zero in this loop but must
447 * later be reset after reading in the cluster
448 * buffer.
449 */
450 if ((chunkidx & (nicluster - 1)) == 0) {
451 agbno = XFS_AGINO_TO_AGBNO(mp,
452 irbp->ir_startino) +
453 ((chunkidx & nimask) >>
454 mp->m_sb.sb_inopblog);
455 }
456 ino = XFS_AGINO_TO_INO(mp, agno, agino);
457 /*
458 * Skip if this inode is free.
459 */
460 if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free) {
461 lastino = ino;
462 continue;
463 }
464 /*
465 * Count used inodes as free so we can tell
466 * when the chunk is used up.
467 */
468 irbp->ir_freecount++;
469
470 /*
471 * Get the inode and fill in a single buffer.
472 */
473 ubused = statstruct_size;
474 error = formatter(mp, ino, ubufp, ubleft,
475 &ubused, &fmterror);
476 if (fmterror == BULKSTAT_RV_NOTHING) {
477 if (error && error != ENOENT &&
478 error != EINVAL) {
479 ubleft = 0;
480 rval = error;
481 break;
482 }
483 lastino = ino;
484 continue;
485 }
486 if (fmterror == BULKSTAT_RV_GIVEUP) {
487 ubleft = 0;
488 ASSERT(error);
489 rval = error;
490 break;
491 }
492 if (ubufp)
493 ubufp += ubused;
494 ubleft -= ubused;
495 ubelem++;
496 lastino = ino;
497 }
498
499 cond_resched();
500 }
501
502 if (bp)
503 xfs_buf_relse(bp);
504
505 /*
506 * Set up for the next loop iteration.
507 */
508 if (XFS_BULKSTAT_UBLEFT(ubleft)) {
509 if (end_of_ag) {
510 agno++;
511 agino = 0;
512 } else
513 agino = XFS_INO_TO_AGINO(mp, lastino);
514 } else
515 break;
516 }
517 /*
518 * Done, we're either out of filesystem or space to put the data.
519 */
520 kmem_free_large(irbuf);
521 *ubcountp = ubelem;
522 /*
523 * Found some inodes, return them now and return the error next time.
524 */
525 if (ubelem)
526 rval = 0;
527 if (agno >= mp->m_sb.sb_agcount) {
528 /*
529 * If we ran out of filesystem, mark lastino as off
530 * the end of the filesystem, so the next call
531 * will return immediately.
532 */
533 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
534 *done = 1;
535 } else
536 *lastinop = (xfs_ino_t)lastino;
537
538 return rval;
539 }
540
541 /*
542 * Return stat information in bulk (by-inode) for the filesystem.
543 * Special case for non-sequential one inode bulkstat.
544 */
545 int /* error status */
xfs_bulkstat_single(xfs_mount_t * mp,xfs_ino_t * lastinop,char __user * buffer,int * done)546 xfs_bulkstat_single(
547 xfs_mount_t *mp, /* mount point for filesystem */
548 xfs_ino_t *lastinop, /* inode to return */
549 char __user *buffer, /* buffer with inode stats */
550 int *done) /* 1 if there are more stats to get */
551 {
552 int count; /* count value for bulkstat call */
553 int error; /* return value */
554 xfs_ino_t ino; /* filesystem inode number */
555 int res; /* result from bs1 */
556
557 /*
558 * note that requesting valid inode numbers which are not allocated
559 * to inodes will most likely cause xfs_itobp to generate warning
560 * messages about bad magic numbers. This is ok. The fact that
561 * the inode isn't actually an inode is handled by the
562 * error check below. Done this way to make the usual case faster
563 * at the expense of the error case.
564 */
565
566 ino = (xfs_ino_t)*lastinop;
567 error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t), 0, &res);
568 if (error) {
569 /*
570 * Special case way failed, do it the "long" way
571 * to see if that works.
572 */
573 (*lastinop)--;
574 count = 1;
575 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
576 sizeof(xfs_bstat_t), buffer, done))
577 return error;
578 if (count == 0 || (xfs_ino_t)*lastinop != ino)
579 return error == EFSCORRUPTED ?
580 XFS_ERROR(EINVAL) : error;
581 else
582 return 0;
583 }
584 *done = 0;
585 return 0;
586 }
587
588 int
xfs_inumbers_fmt(void __user * ubuffer,const xfs_inogrp_t * buffer,long count,long * written)589 xfs_inumbers_fmt(
590 void __user *ubuffer, /* buffer to write to */
591 const xfs_inogrp_t *buffer, /* buffer to read from */
592 long count, /* # of elements to read */
593 long *written) /* # of bytes written */
594 {
595 if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer)))
596 return -EFAULT;
597 *written = count * sizeof(*buffer);
598 return 0;
599 }
600
601 /*
602 * Return inode number table for the filesystem.
603 */
604 int /* error status */
xfs_inumbers(xfs_mount_t * mp,xfs_ino_t * lastino,int * count,void __user * ubuffer,inumbers_fmt_pf formatter)605 xfs_inumbers(
606 xfs_mount_t *mp, /* mount point for filesystem */
607 xfs_ino_t *lastino, /* last inode returned */
608 int *count, /* size of buffer/count returned */
609 void __user *ubuffer,/* buffer with inode descriptions */
610 inumbers_fmt_pf formatter)
611 {
612 xfs_buf_t *agbp;
613 xfs_agino_t agino;
614 xfs_agnumber_t agno;
615 int bcount;
616 xfs_inogrp_t *buffer;
617 int bufidx;
618 xfs_btree_cur_t *cur;
619 int error;
620 xfs_inobt_rec_incore_t r;
621 int i;
622 xfs_ino_t ino;
623 int left;
624 int tmp;
625
626 ino = (xfs_ino_t)*lastino;
627 agno = XFS_INO_TO_AGNO(mp, ino);
628 agino = XFS_INO_TO_AGINO(mp, ino);
629 left = *count;
630 *count = 0;
631 bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)));
632 buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
633 error = bufidx = 0;
634 cur = NULL;
635 agbp = NULL;
636 while (left > 0 && agno < mp->m_sb.sb_agcount) {
637 if (agbp == NULL) {
638 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
639 if (error) {
640 /*
641 * If we can't read the AGI of this ag,
642 * then just skip to the next one.
643 */
644 ASSERT(cur == NULL);
645 agbp = NULL;
646 agno++;
647 agino = 0;
648 continue;
649 }
650 cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno);
651 error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_GE,
652 &tmp);
653 if (error) {
654 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
655 cur = NULL;
656 xfs_buf_relse(agbp);
657 agbp = NULL;
658 /*
659 * Move up the last inode in the current
660 * chunk. The lookup_ge will always get
661 * us the first inode in the next chunk.
662 */
663 agino += XFS_INODES_PER_CHUNK - 1;
664 continue;
665 }
666 }
667 error = xfs_inobt_get_rec(cur, &r, &i);
668 if (error || i == 0) {
669 xfs_buf_relse(agbp);
670 agbp = NULL;
671 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
672 cur = NULL;
673 agno++;
674 agino = 0;
675 continue;
676 }
677 agino = r.ir_startino + XFS_INODES_PER_CHUNK - 1;
678 buffer[bufidx].xi_startino =
679 XFS_AGINO_TO_INO(mp, agno, r.ir_startino);
680 buffer[bufidx].xi_alloccount =
681 XFS_INODES_PER_CHUNK - r.ir_freecount;
682 buffer[bufidx].xi_allocmask = ~r.ir_free;
683 bufidx++;
684 left--;
685 if (bufidx == bcount) {
686 long written;
687 if (formatter(ubuffer, buffer, bufidx, &written)) {
688 error = XFS_ERROR(EFAULT);
689 break;
690 }
691 ubuffer += written;
692 *count += bufidx;
693 bufidx = 0;
694 }
695 if (left) {
696 error = xfs_btree_increment(cur, 0, &tmp);
697 if (error) {
698 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
699 cur = NULL;
700 xfs_buf_relse(agbp);
701 agbp = NULL;
702 /*
703 * The agino value has already been bumped.
704 * Just try to skip up to it.
705 */
706 agino += XFS_INODES_PER_CHUNK;
707 continue;
708 }
709 }
710 }
711 if (!error) {
712 if (bufidx) {
713 long written;
714 if (formatter(ubuffer, buffer, bufidx, &written))
715 error = XFS_ERROR(EFAULT);
716 else
717 *count += bufidx;
718 }
719 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
720 }
721 kmem_free(buffer);
722 if (cur)
723 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
724 XFS_BTREE_NOERROR));
725 if (agbp)
726 xfs_buf_relse(agbp);
727 return error;
728 }
729