Bug Summary

File:fs/xfs/xfs_itable.c
Warning:line 161, column 6
Copies out a struct with untouched element(s): bs_cowextsize

Annotated Source Code

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_shared.h"
21#include "xfs_format.h"
22#include "xfs_log_format.h"
23#include "xfs_trans_resv.h"
24#include "xfs_mount.h"
25#include "xfs_inode.h"
26#include "xfs_btree.h"
27#include "xfs_ialloc.h"
28#include "xfs_ialloc_btree.h"
29#include "xfs_itable.h"
30#include "xfs_error.h"
31#include "xfs_trace.h"
32#include "xfs_icache.h"
33
34STATIC int
35xfs_internal_inum(
36 xfs_mount_t *mp,
37 xfs_ino_t ino)
38{
39 return (ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
40 (xfs_sb_version_hasquota(&mp->m_sb) &&
41 xfs_is_quota_inode(&mp->m_sb, ino)));
42}
43
44/*
45 * Return stat information for one inode.
46 * Return 0 if ok, else errno.
47 */
48int
49xfs_bulkstat_one_int(
50 struct xfs_mount *mp, /* mount point for filesystem */
51 xfs_ino_t ino, /* inode to get data for */
52 void __user *buffer, /* buffer to place output in */
53 int ubsize, /* size of buffer */
54 bulkstat_one_fmt_pf formatter, /* formatter, copy to user */
55 int *ubused, /* bytes used by me */
56 int *stat) /* BULKSTAT_RV_... */
57{
58 struct xfs_icdinode *dic; /* dinode core info pointer */
59 struct xfs_inode *ip; /* incore inode pointer */
60 struct inode *inode;
61 struct xfs_bstat *buf; /* return buffer */
62 int error = 0; /* error value */
63
64 *stat = BULKSTAT_RV_NOTHING0;
65
66 if (!buffer || xfs_internal_inum(mp, ino))
2
←
Assuming 'buffer' is non-null
→
3
←
Taking false branch
→
67 return -EINVAL22;
68
69 buf = kmem_zalloc(sizeof(*buf), KM_SLEEP(( xfs_km_flags_t)0x0001u) | KM_MAYFAIL(( xfs_km_flags_t)0x0008u));
70 if (!buf)
4
←
Assuming 'buf' is non-null
→
5
←
Taking false branch
→
71 return -ENOMEM12;
72
73 error = xfs_iget(mp, NULL((void *)0), ino,
74 (XFS_IGET_DONTCACHE0x4 | XFS_IGET_UNTRUSTED0x2),
75 XFS_ILOCK_SHARED(1<<3), &ip);
76 if (error)
6
←
Assuming 'error' is 0
→
7
←
Taking false branch
→
77 goto out_free;
78
79 ASSERT(ip != NULL)((ip != ((void *)0)) ? (void)0 : assfail("ip != NULL", "fs/xfs/xfs_itable.c"
, 79));
80 ASSERT(ip->i_imap.im_blkno != 0)((ip->i_imap.im_blkno != 0) ? (void)0 : assfail("ip->i_imap.im_blkno != 0"
, "fs/xfs/xfs_itable.c", 80));
81 inode = VFS_I(ip);
82
83 dic = &ip->i_d;
84
85 /* xfs_iget returns the following without needing
86 * further change.
87 */
88 buf->bs_projid_lo = dic->di_projid_lo;
89 buf->bs_projid_hi = dic->di_projid_hi;
90 buf->bs_ino = ino;
91 buf->bs_uid = dic->di_uid;
92 buf->bs_gid = dic->di_gid;
93 buf->bs_size = dic->di_size;
94
95 buf->bs_nlink = inode->i_nlink;
96 buf->bs_atime.tv_sec = inode->i_atime.tv_sec;
97 buf->bs_atime.tv_nsec = inode->i_atime.tv_nsec;
98 buf->bs_mtime.tv_sec = inode->i_mtime.tv_sec;
99 buf->bs_mtime.tv_nsec = inode->i_mtime.tv_nsec;
100 buf->bs_ctime.tv_sec = inode->i_ctime.tv_sec;
101 buf->bs_ctime.tv_nsec = inode->i_ctime.tv_nsec;
102 buf->bs_gen = inode->i_generation;
103 buf->bs_mode = inode->i_mode;
104
105 buf->bs_xflags = xfs_ip2xflags(ip);
106 buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
107 buf->bs_extents = dic->di_nextents;
108 memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
109 buf->bs_dmevmask = dic->di_dmevmask;
110 buf->bs_dmstate = dic->di_dmstate;
111 buf->bs_aextents = dic->di_anextents;
112 buf->bs_forkoff = XFS_IFORK_BOFF(ip)((int)((ip)->i_d.di_forkoff << 3));
113
114 if (dic->di_version == 3) {
8
←
Taking false branch
→
115 if (dic->di_flags2 & XFS_DIFLAG2_COWEXTSIZE(1 << 2))
116 buf->bs_cowextsize = dic->di_cowextsize <<
117 mp->m_sb.sb_blocklog;
118 }
119
120 switch (dic->di_format) {
9
←
Control jumps to 'case XFS_DINODE_FMT_UUID:' at line 127
→
121 case XFS_DINODE_FMT_DEV:
122 buf->bs_rdev = ip->i_df.if_u2.if_rdev;
123 buf->bs_blksize = BLKDEV_IOSIZE(1<<12);
124 buf->bs_blocks = 0;
125 break;
126 case XFS_DINODE_FMT_LOCAL:
127 case XFS_DINODE_FMT_UUID:
128 buf->bs_rdev = 0;
129 buf->bs_blksize = mp->m_sb.sb_blocksize;
130 buf->bs_blocks = 0;
131 break;
10
←
 Execution continues on line 139
→
132 case XFS_DINODE_FMT_EXTENTS:
133 case XFS_DINODE_FMT_BTREE:
134 buf->bs_rdev = 0;
135 buf->bs_blksize = mp->m_sb.sb_blocksize;
136 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
137 break;
138 }
139 xfs_iunlock(ip, XFS_ILOCK_SHARED(1<<3));
140 IRELE(ip)do { trace_xfs_irele(ip, ({ __label__ __here; __here: (unsigned
long)&&__here; })); iput(VFS_I(ip)); } while (0);
141
142 error = formatter(buffer, ubsize, ubused, buf);
11
←
Calling 'xfs_bulkstat_one_fmt'
→
143 if (!error)
144 *stat = BULKSTAT_RV_DIDONE1;
145
146 out_free:
147 kmem_free(buf);
148 return error;
149}
150
151/* Return 0 on success or positive error */
152STATIC int
153xfs_bulkstat_one_fmt(
154 void __user *ubuffer,
155 int ubsize,
156 int *ubused,
157 const xfs_bstat_t *buffer)
158{
159 if (ubsize < sizeof(*buffer))
12
←
Taking false branch
→
160 return -ENOMEM12;
161 if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
13
←
Copies out a struct with untouched element(s): bs_cowextsize
162 return -EFAULT14;
163 if (ubused)
164 *ubused = sizeof(*buffer);
165 return 0;
166}
167
168int
169xfs_bulkstat_one(
170 xfs_mount_t *mp, /* mount point for filesystem */
171 xfs_ino_t ino, /* inode number to get data for */
172 void __user *buffer, /* buffer to place output in */
173 int ubsize, /* size of buffer */
174 int *ubused, /* bytes used by me */
175 int *stat) /* BULKSTAT_RV_... */
176{
177 return xfs_bulkstat_one_int(mp, ino, buffer, ubsize,
1
Calling 'xfs_bulkstat_one_int'
→
178 xfs_bulkstat_one_fmt, ubused, stat);
179}
180
181/*
182 * Loop over all clusters in a chunk for a given incore inode allocation btree
183 * record. Do a readahead if there are any allocated inodes in that cluster.
184 */
185STATIC void
186xfs_bulkstat_ichunk_ra(
187 struct xfs_mount *mp,
188 xfs_agnumber_t agno,
189 struct xfs_inobt_rec_incore *irec)
190{
191 xfs_agblock_t agbno;
192 struct blk_plug plug;
193 int blks_per_cluster;
194 int inodes_per_cluster;
195 int i; /* inode chunk index */
196
197 agbno = XFS_AGINO_TO_AGBNO(mp, irec->ir_startino)((irec->ir_startino) >> (mp)->m_sb.sb_inopblog);
198 blks_per_cluster = xfs_icluster_size_fsb(mp);
199 inodes_per_cluster = blks_per_cluster << mp->m_sb.sb_inopblog;
200
201 blk_start_plug(&plug);
202 for (i = 0; i < XFS_INODES_PER_CHUNK(8 * sizeof(xfs_inofree_t));
203 i += inodes_per_cluster, agbno += blks_per_cluster) {
204 if (xfs_inobt_maskn(i, inodes_per_cluster) & ~irec->ir_free) {
205 xfs_btree_reada_bufs(mp, agno, agbno, blks_per_cluster,
206 &xfs_inode_buf_ops);
207 }
208 }
209 blk_finish_plug(&plug);
210}
211
212/*
213 * Lookup the inode chunk that the given inode lives in and then get the record
214 * if we found the chunk. If the inode was not the last in the chunk and there
215 * are some left allocated, update the data for the pointed-to record as well as
216 * return the count of grabbed inodes.
217 */
218STATIC int
219xfs_bulkstat_grab_ichunk(
220 struct xfs_btree_cur *cur, /* btree cursor */
221 xfs_agino_t agino, /* starting inode of chunk */
222 int *icount,/* return # of inodes grabbed */
223 struct xfs_inobt_rec_incore *irec) /* btree record */
224{
225 int idx; /* index into inode chunk */
226 int stat;
227 int error = 0;
228
229 /* Lookup the inode chunk that this inode lives in */
230 error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE((xfs_lookup_t)XFS_LOOKUP_LEi), &stat);
231 if (error)
232 return error;
233 if (!stat) {
234 *icount = 0;
235 return error;
236 }
237
238 /* Get the record, should always work */
239 error = xfs_inobt_get_rec(cur, irec, &stat);
240 if (error)
241 return error;
242 XFS_WANT_CORRUPTED_RETURN(cur->bc_mp, stat == 1){ int fs_is_ok = (stat == 1); ((fs_is_ok) ? (void)0 : assfail
("fs_is_ok", "fs/xfs/xfs_itable.c", 242)); if ((!fs_is_ok)) {
xfs_error_report("XFS_WANT_CORRUPTED_RETURN", 1, cur->bc_mp
, "fs/xfs/xfs_itable.c", 242, __builtin_return_address(0)); return
-117; } };
243
244 /* Check if the record contains the inode in request */
245 if (irec->ir_startino + XFS_INODES_PER_CHUNK(8 * sizeof(xfs_inofree_t)) <= agino) {
246 *icount = 0;
247 return 0;
248 }
249
250 idx = agino - irec->ir_startino + 1;
251 if (idx < XFS_INODES_PER_CHUNK(8 * sizeof(xfs_inofree_t)) &&
252 (xfs_inobt_maskn(idx, XFS_INODES_PER_CHUNK(8 * sizeof(xfs_inofree_t)) - idx) & ~irec->ir_free)) {
253 int i;
254
255 /* We got a right chunk with some left inodes allocated at it.
256 * Grab the chunk record. Mark all the uninteresting inodes
257 * free -- because they're before our start point.
258 */
259 for (i = 0; i < idx; i++) {
260 if (XFS_INOBT_MASK(i)((xfs_inofree_t)1 << (i)) & ~irec->ir_free)
261 irec->ir_freecount++;
262 }
263
264 irec->ir_free |= xfs_inobt_maskn(0, idx);
265 *icount = irec->ir_count - irec->ir_freecount;
266 }
267
268 return 0;
269}
270
271#define XFS_BULKSTAT_UBLEFT(ubleft)((ubleft) >= statstruct_size) ((ubleft) >= statstruct_size)
272
273struct xfs_bulkstat_agichunk {
274 char __user **ac_ubuffer;/* pointer into user's buffer */
275 int ac_ubleft; /* bytes left in user's buffer */
276 int ac_ubelem; /* spaces used in user's buffer */
277};
278
279/*
280 * Process inodes in chunk with a pointer to a formatter function
281 * that will iget the inode and fill in the appropriate structure.
282 */
283static int
284xfs_bulkstat_ag_ichunk(
285 struct xfs_mount *mp,
286 xfs_agnumber_t agno,
287 struct xfs_inobt_rec_incore *irbp,
288 bulkstat_one_pf formatter,
289 size_t statstruct_size,
290 struct xfs_bulkstat_agichunk *acp,
291 xfs_agino_t *last_agino)
292{
293 char __user **ubufp = acp->ac_ubuffer;
294 int chunkidx;
295 int error = 0;
296 xfs_agino_t agino = irbp->ir_startino;
297
298 for (chunkidx = 0; chunkidx < XFS_INODES_PER_CHUNK(8 * sizeof(xfs_inofree_t));
299 chunkidx++, agino++) {
300 int fmterror;
301 int ubused;
302
303 /* inode won't fit in buffer, we are done */
304 if (acp->ac_ubleft < statstruct_size)
305 break;
306
307 /* Skip if this inode is free */
308 if (XFS_INOBT_MASK(chunkidx)((xfs_inofree_t)1 << (chunkidx)) & irbp->ir_free)
309 continue;
310
311 /* Get the inode and fill in a single buffer */
312 ubused = statstruct_size;
313 error = formatter(mp, XFS_AGINO_TO_INO(mp, agno, agino)(((xfs_ino_t)(agno) << (mp)->m_agino_log) | (agino)),
314 *ubufp, acp->ac_ubleft, &ubused, &fmterror);
315
316 if (fmterror == BULKSTAT_RV_GIVEUP2 ||
317 (error && error != -ENOENT2 && error != -EINVAL22)) {
318 acp->ac_ubleft = 0;
319 ASSERT(error)((error) ? (void)0 : assfail("error", "fs/xfs/xfs_itable.c", 319
));
320 break;
321 }
322
323 /* be careful not to leak error if at end of chunk */
324 if (fmterror == BULKSTAT_RV_NOTHING0 || error) {
325 error = 0;
326 continue;
327 }
328
329 *ubufp += ubused;
330 acp->ac_ubleft -= ubused;
331 acp->ac_ubelem++;
332 }
333
334 /*
335 * Post-update *last_agino. At this point, agino will always point one
336 * inode past the last inode we processed successfully. Hence we
337 * substract that inode when setting the *last_agino cursor so that we
338 * return the correct cookie to userspace. On the next bulkstat call,
339 * the inode under the lastino cookie will be skipped as we have already
340 * processed it here.
341 */
342 *last_agino = agino - 1;
343
344 return error;
345}
346
347/*
348 * Return stat information in bulk (by-inode) for the filesystem.
349 */
350int /* error status */
351xfs_bulkstat(
352 xfs_mount_t *mp, /* mount point for filesystem */
353 xfs_ino_t *lastinop, /* last inode returned */
354 int *ubcountp, /* size of buffer/count returned */
355 bulkstat_one_pf formatter, /* func that'd fill a single buf */
356 size_t statstruct_size, /* sizeof struct filling */
357 char __user *ubuffer, /* buffer with inode stats */
358 int *done) /* 1 if there are more stats to get */
359{
360 xfs_buf_t *agbp; /* agi header buffer */
361 xfs_agino_t agino; /* inode # in allocation group */
362 xfs_agnumber_t agno; /* allocation group number */
363 xfs_btree_cur_t *cur; /* btree cursor for ialloc btree */
364 size_t irbsize; /* size of irec buffer in bytes */
365 xfs_inobt_rec_incore_t *irbuf; /* start of irec buffer */
366 int nirbuf; /* size of irbuf */
367 int ubcount; /* size of user's buffer */
368 struct xfs_bulkstat_agichunk ac;
369 int error = 0;
370
371 /*
372 * Get the last inode value, see if there's nothing to do.
373 */
374 agno = XFS_INO_TO_AGNO(mp, *lastinop)((xfs_agnumber_t)((*lastinop) >> (mp)->m_agino_log));
375 agino = XFS_INO_TO_AGINO(mp, *lastinop)((xfs_agino_t)(*lastinop) & (__uint32_t)((1ULL << (
(mp)->m_agino_log)) - 1));
376 if (agno >= mp->m_sb.sb_agcount ||
377 *lastinop != XFS_AGINO_TO_INO(mp, agno, agino)(((xfs_ino_t)(agno) << (mp)->m_agino_log) | (agino))) {
378 *done = 1;
379 *ubcountp = 0;
380 return 0;
381 }
382
383 ubcount = *ubcountp; /* statstruct's */
384 ac.ac_ubuffer = &ubuffer;
385 ac.ac_ubleft = ubcount * statstruct_size; /* bytes */;
386 ac.ac_ubelem = 0;
387
388 *ubcountp = 0;
389 *done = 0;
390
391 irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE((1UL) << 12), PAGE_SIZE((1UL) << 12) * 4);
392 if (!irbuf)
393 return -ENOMEM12;
394
395 nirbuf = irbsize / sizeof(*irbuf);
396
397 /*
398 * Loop over the allocation groups, starting from the last
399 * inode returned; 0 means start of the allocation group.
400 */
401 while (agno < mp->m_sb.sb_agcount) {
402 struct xfs_inobt_rec_incore *irbp = irbuf;
403 struct xfs_inobt_rec_incore *irbufend = irbuf + nirbuf;
404 bool end_of_ag = false;
405 int icount = 0;
406 int stat;
407
408 error = xfs_ialloc_read_agi(mp, NULL((void *)0), agno, &agbp);
409 if (error)
410 break;
411 /*
412 * Allocate and initialize a btree cursor for ialloc btree.
413 */
414 cur = xfs_inobt_init_cursor(mp, NULL((void *)0), agbp, agno,
415 XFS_BTNUM_INO((xfs_btnum_t)XFS_BTNUM_INOi));
416 if (agino > 0) {
417 /*
418 * In the middle of an allocation group, we need to get
419 * the remainder of the chunk we're in.
420 */
421 struct xfs_inobt_rec_incore r;
422
423 error = xfs_bulkstat_grab_ichunk(cur, agino, &icount, &r);
424 if (error)
425 goto del_cursor;
426 if (icount) {
427 irbp->ir_startino = r.ir_startino;
428 irbp->ir_holemask = r.ir_holemask;
429 irbp->ir_count = r.ir_count;
430 irbp->ir_freecount = r.ir_freecount;
431 irbp->ir_free = r.ir_free;
432 irbp++;
433 }
434 /* Increment to the next record */
435 error = xfs_btree_increment(cur, 0, &stat);
436 } else {
437 /* Start of ag. Lookup the first inode chunk */
438 error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE((xfs_lookup_t)XFS_LOOKUP_GEi), &stat);
439 }
440 if (error || stat == 0) {
441 end_of_ag = true;
442 goto del_cursor;
443 }
444
445 /*
446 * Loop through inode btree records in this ag,
447 * until we run out of inodes or space in the buffer.
448 */
449 while (irbp < irbufend && icount < ubcount) {
450 struct xfs_inobt_rec_incore r;
451
452 error = xfs_inobt_get_rec(cur, &r, &stat);
453 if (error || stat == 0) {
454 end_of_ag = true;
455 goto del_cursor;
456 }
457
458 /*
459 * If this chunk has any allocated inodes, save it.
460 * Also start read-ahead now for this chunk.
461 */
462 if (r.ir_freecount < r.ir_count) {
463 xfs_bulkstat_ichunk_ra(mp, agno, &r);
464 irbp->ir_startino = r.ir_startino;
465 irbp->ir_holemask = r.ir_holemask;
466 irbp->ir_count = r.ir_count;
467 irbp->ir_freecount = r.ir_freecount;
468 irbp->ir_free = r.ir_free;
469 irbp++;
470 icount += r.ir_count - r.ir_freecount;
471 }
472 error = xfs_btree_increment(cur, 0, &stat);
473 if (error || stat == 0) {
474 end_of_ag = true;
475 goto del_cursor;
476 }
477 cond_resched()({ ___might_sleep("fs/xfs/xfs_itable.c", 477, 0); _cond_resched
(); });
478 }
479
480 /*
481 * Drop the btree buffers and the agi buffer as we can't hold any
482 * of the locks these represent when calling iget. If there is a
483 * pending error, then we are done.
484 */
485del_cursor:
486 xfs_btree_del_cursor(cur, error ?
487 XFS_BTREE_ERROR1 : XFS_BTREE_NOERROR0);
488 xfs_buf_relse(agbp);
489 if (error)
490 break;
491 /*
492 * Now format all the good inodes into the user's buffer. The
493 * call to xfs_bulkstat_ag_ichunk() sets up the agino pointer
494 * for the next loop iteration.
495 */
496 irbufend = irbp;
497 for (irbp = irbuf;
498 irbp < irbufend && ac.ac_ubleft >= statstruct_size;
499 irbp++) {
500 error = xfs_bulkstat_ag_ichunk(mp, agno, irbp,
501 formatter, statstruct_size, &ac,
502 &agino);
503 if (error)
504 break;
505
506 cond_resched()({ ___might_sleep("fs/xfs/xfs_itable.c", 506, 0); _cond_resched
(); });
507 }
508
509 /*
510 * If we've run out of space or had a formatting error, we
511 * are now done
512 */
513 if (ac.ac_ubleft < statstruct_size || error)
514 break;
515
516 if (end_of_ag) {
517 agno++;
518 agino = 0;
519 }
520 }
521 /*
522 * Done, we're either out of filesystem or space to put the data.
523 */
524 kmem_free(irbuf);
525 *ubcountp = ac.ac_ubelem;
526
527 /*
528 * We found some inodes, so clear the error status and return them.
529 * The lastino pointer will point directly at the inode that triggered
530 * any error that occurred, so on the next call the error will be
531 * triggered again and propagated to userspace as there will be no
532 * formatted inodes in the buffer.
533 */
534 if (ac.ac_ubelem)
535 error = 0;
536
537 /*
538 * If we ran out of filesystem, lastino will point off the end of
539 * the filesystem so the next call will return immediately.
540 */
541 *lastinop = XFS_AGINO_TO_INO(mp, agno, agino)(((xfs_ino_t)(agno) << (mp)->m_agino_log) | (agino));
542 if (agno >= mp->m_sb.sb_agcount)
543 *done = 1;
544
545 return error;
546}
547
548int
549xfs_inumbers_fmt(
550 void __user *ubuffer, /* buffer to write to */
551 const struct xfs_inogrp *buffer, /* buffer to read from */
552 long count, /* # of elements to read */
553 long *written) /* # of bytes written */
554{
555 if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer)))
556 return -EFAULT14;
557 *written = count * sizeof(*buffer);
558 return 0;
559}
560
561/*
562 * Return inode number table for the filesystem.
563 */
564int /* error status */
565xfs_inumbers(
566 struct xfs_mount *mp,/* mount point for filesystem */
567 xfs_ino_t *lastino,/* last inode returned */
568 int *count,/* size of buffer/count returned */
569 void __user *ubuffer,/* buffer with inode descriptions */
570 inumbers_fmt_pf formatter)
571{
572 xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, *lastino)((xfs_agnumber_t)((*lastino) >> (mp)->m_agino_log));
573 xfs_agino_t agino = XFS_INO_TO_AGINO(mp, *lastino)((xfs_agino_t)(*lastino) & (__uint32_t)((1ULL << ((
mp)->m_agino_log)) - 1));
574 struct xfs_btree_cur *cur = NULL((void *)0);
575 struct xfs_buf *agbp = NULL((void *)0);
576 struct xfs_inogrp *buffer;
577 int bcount;
578 int left = *count;
579 int bufidx = 0;
580 int error = 0;
581
582 *count = 0;
583 if (agno >= mp->m_sb.sb_agcount ||
584 *lastino != XFS_AGINO_TO_INO(mp, agno, agino)(((xfs_ino_t)(agno) << (mp)->m_agino_log) | (agino)))
585 return error;
586
587 bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)))(({ typeof(left) __UNIQUE_ID_min1_40 = (left); typeof((int)((
(1UL) << 12) / sizeof(*buffer))) __UNIQUE_ID_min2_41 = (
(int)(((1UL) << 12) / sizeof(*buffer))); (void) (&__UNIQUE_ID_min1_40
== &__UNIQUE_ID_min2_41); __UNIQUE_ID_min1_40 < __UNIQUE_ID_min2_41
? __UNIQUE_ID_min1_40 : __UNIQUE_ID_min2_41; }));
588 buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP(( xfs_km_flags_t)0x0001u));
589 do {
590 struct xfs_inobt_rec_incore r;
591 int stat;
592
593 if (!agbp) {
594 error = xfs_ialloc_read_agi(mp, NULL((void *)0), agno, &agbp);
595 if (error)
596 break;
597
598 cur = xfs_inobt_init_cursor(mp, NULL((void *)0), agbp, agno,
599 XFS_BTNUM_INO((xfs_btnum_t)XFS_BTNUM_INOi));
600 error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_GE((xfs_lookup_t)XFS_LOOKUP_GEi),
601 &stat);
602 if (error)
603 break;
604 if (!stat)
605 goto next_ag;
606 }
607
608 error = xfs_inobt_get_rec(cur, &r, &stat);
609 if (error)
610 break;
611 if (!stat)
612 goto next_ag;
613
614 agino = r.ir_startino + XFS_INODES_PER_CHUNK(8 * sizeof(xfs_inofree_t)) - 1;
615 buffer[bufidx].xi_startino =
616 XFS_AGINO_TO_INO(mp, agno, r.ir_startino)(((xfs_ino_t)(agno) << (mp)->m_agino_log) | (r.ir_startino
));
617 buffer[bufidx].xi_alloccount = r.ir_count - r.ir_freecount;
618 buffer[bufidx].xi_allocmask = ~r.ir_free;
619 if (++bufidx == bcount) {
620 long written;
621
622 error = formatter(ubuffer, buffer, bufidx, &written);
623 if (error)
624 break;
625 ubuffer += written;
626 *count += bufidx;
627 bufidx = 0;
628 }
629 if (!--left)
630 break;
631
632 error = xfs_btree_increment(cur, 0, &stat);
633 if (error)
634 break;
635 if (stat)
636 continue;
637
638next_ag:
639 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR1);
640 cur = NULL((void *)0);
641 xfs_buf_relse(agbp);
642 agbp = NULL((void *)0);
643 agino = 0;
644 agno++;
645 } while (agno < mp->m_sb.sb_agcount);
646
647 if (!error) {
648 if (bufidx) {
649 long written;
650
651 error = formatter(ubuffer, buffer, bufidx, &written);
652 if (!error)
653 *count += bufidx;
654 }
655 *lastino = XFS_AGINO_TO_INO(mp, agno, agino)(((xfs_ino_t)(agno) << (mp)->m_agino_log) | (agino));
656 }
657
658 kmem_free(buffer);
659 if (cur)
660 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR1 :
661 XFS_BTREE_NOERROR0));
662 if (agbp)
663 xfs_buf_relse(agbp);
664
665 return error;
666}