Merge git://git.infradead.org/mtd-2.6
[linux-2.6] / fs / xfs / xfs_itable.c
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_ialloc.h"
38 #include "xfs_itable.h"
39 #include "xfs_error.h"
40 #include "xfs_btree.h"
41
42 int
43 xfs_internal_inum(
44         xfs_mount_t     *mp,
45         xfs_ino_t       ino)
46 {
47         return (ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
48                 (xfs_sb_version_hasquota(&mp->m_sb) &&
49                  (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino)));
50 }
51
52 STATIC int
53 xfs_bulkstat_one_iget(
54         xfs_mount_t     *mp,            /* mount point for filesystem */
55         xfs_ino_t       ino,            /* inode number to get data for */
56         xfs_daddr_t     bno,            /* starting bno of inode cluster */
57         xfs_bstat_t     *buf,           /* return buffer */
58         int             *stat)          /* BULKSTAT_RV_... */
59 {
60         xfs_icdinode_t  *dic;   /* dinode core info pointer */
61         xfs_inode_t     *ip;            /* incore inode pointer */
62         int             error;
63
64         error = xfs_iget(mp, NULL, ino,
65                          XFS_IGET_BULKSTAT, XFS_ILOCK_SHARED, &ip, bno);
66         if (error) {
67                 *stat = BULKSTAT_RV_NOTHING;
68                 return error;
69         }
70
71         ASSERT(ip != NULL);
72         ASSERT(ip->i_imap.im_blkno != 0);
73
74         dic = &ip->i_d;
75
76         /* xfs_iget returns the following without needing
77          * further change.
78          */
79         buf->bs_nlink = dic->di_nlink;
80         buf->bs_projid = dic->di_projid;
81         buf->bs_ino = ino;
82         buf->bs_mode = dic->di_mode;
83         buf->bs_uid = dic->di_uid;
84         buf->bs_gid = dic->di_gid;
85         buf->bs_size = dic->di_size;
86         vn_atime_to_bstime(VFS_I(ip), &buf->bs_atime);
87         buf->bs_mtime.tv_sec = dic->di_mtime.t_sec;
88         buf->bs_mtime.tv_nsec = dic->di_mtime.t_nsec;
89         buf->bs_ctime.tv_sec = dic->di_ctime.t_sec;
90         buf->bs_ctime.tv_nsec = dic->di_ctime.t_nsec;
91         buf->bs_xflags = xfs_ip2xflags(ip);
92         buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
93         buf->bs_extents = dic->di_nextents;
94         buf->bs_gen = dic->di_gen;
95         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
96         buf->bs_dmevmask = dic->di_dmevmask;
97         buf->bs_dmstate = dic->di_dmstate;
98         buf->bs_aextents = dic->di_anextents;
99
100         switch (dic->di_format) {
101         case XFS_DINODE_FMT_DEV:
102                 buf->bs_rdev = ip->i_df.if_u2.if_rdev;
103                 buf->bs_blksize = BLKDEV_IOSIZE;
104                 buf->bs_blocks = 0;
105                 break;
106         case XFS_DINODE_FMT_LOCAL:
107         case XFS_DINODE_FMT_UUID:
108                 buf->bs_rdev = 0;
109                 buf->bs_blksize = mp->m_sb.sb_blocksize;
110                 buf->bs_blocks = 0;
111                 break;
112         case XFS_DINODE_FMT_EXTENTS:
113         case XFS_DINODE_FMT_BTREE:
114                 buf->bs_rdev = 0;
115                 buf->bs_blksize = mp->m_sb.sb_blocksize;
116                 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
117                 break;
118         }
119
120         xfs_iput(ip, XFS_ILOCK_SHARED);
121         return error;
122 }
123
124 STATIC void
125 xfs_bulkstat_one_dinode(
126         xfs_mount_t     *mp,            /* mount point for filesystem */
127         xfs_ino_t       ino,            /* inode number to get data for */
128         xfs_dinode_t    *dic,           /* dinode inode pointer */
129         xfs_bstat_t     *buf)           /* return buffer */
130 {
131         /*
132          * The inode format changed when we moved the link count and
133          * made it 32 bits long.  If this is an old format inode,
134          * convert it in memory to look like a new one.  If it gets
135          * flushed to disk we will convert back before flushing or
136          * logging it.  We zero out the new projid field and the old link
137          * count field.  We'll handle clearing the pad field (the remains
138          * of the old uuid field) when we actually convert the inode to
139          * the new format. We don't change the version number so that we
140          * can distinguish this from a real new format inode.
141          */
142         if (dic->di_version == 1) {
143                 buf->bs_nlink = be16_to_cpu(dic->di_onlink);
144                 buf->bs_projid = 0;
145         } else {
146                 buf->bs_nlink = be32_to_cpu(dic->di_nlink);
147                 buf->bs_projid = be16_to_cpu(dic->di_projid);
148         }
149
150         buf->bs_ino = ino;
151         buf->bs_mode = be16_to_cpu(dic->di_mode);
152         buf->bs_uid = be32_to_cpu(dic->di_uid);
153         buf->bs_gid = be32_to_cpu(dic->di_gid);
154         buf->bs_size = be64_to_cpu(dic->di_size);
155         buf->bs_atime.tv_sec = be32_to_cpu(dic->di_atime.t_sec);
156         buf->bs_atime.tv_nsec = be32_to_cpu(dic->di_atime.t_nsec);
157         buf->bs_mtime.tv_sec = be32_to_cpu(dic->di_mtime.t_sec);
158         buf->bs_mtime.tv_nsec = be32_to_cpu(dic->di_mtime.t_nsec);
159         buf->bs_ctime.tv_sec = be32_to_cpu(dic->di_ctime.t_sec);
160         buf->bs_ctime.tv_nsec = be32_to_cpu(dic->di_ctime.t_nsec);
161         buf->bs_xflags = xfs_dic2xflags(dic);
162         buf->bs_extsize = be32_to_cpu(dic->di_extsize) << mp->m_sb.sb_blocklog;
163         buf->bs_extents = be32_to_cpu(dic->di_nextents);
164         buf->bs_gen = be32_to_cpu(dic->di_gen);
165         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
166         buf->bs_dmevmask = be32_to_cpu(dic->di_dmevmask);
167         buf->bs_dmstate = be16_to_cpu(dic->di_dmstate);
168         buf->bs_aextents = be16_to_cpu(dic->di_anextents);
169
170         switch (dic->di_format) {
171         case XFS_DINODE_FMT_DEV:
172                 buf->bs_rdev = xfs_dinode_get_rdev(dic);
173                 buf->bs_blksize = BLKDEV_IOSIZE;
174                 buf->bs_blocks = 0;
175                 break;
176         case XFS_DINODE_FMT_LOCAL:
177         case XFS_DINODE_FMT_UUID:
178                 buf->bs_rdev = 0;
179                 buf->bs_blksize = mp->m_sb.sb_blocksize;
180                 buf->bs_blocks = 0;
181                 break;
182         case XFS_DINODE_FMT_EXTENTS:
183         case XFS_DINODE_FMT_BTREE:
184                 buf->bs_rdev = 0;
185                 buf->bs_blksize = mp->m_sb.sb_blocksize;
186                 buf->bs_blocks = be64_to_cpu(dic->di_nblocks);
187                 break;
188         }
189 }
190
191 /* Return 0 on success or positive error */
192 STATIC int
193 xfs_bulkstat_one_fmt(
194         void                    __user *ubuffer,
195         int                     ubsize,
196         int                     *ubused,
197         const xfs_bstat_t       *buffer)
198 {
199         if (ubsize < sizeof(*buffer))
200                 return XFS_ERROR(ENOMEM);
201         if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
202                 return XFS_ERROR(EFAULT);
203         if (ubused)
204                 *ubused = sizeof(*buffer);
205         return 0;
206 }
207
208 /*
209  * Return stat information for one inode.
210  * Return 0 if ok, else errno.
211  */
212 int                                     /* error status */
213 xfs_bulkstat_one_int(
214         xfs_mount_t     *mp,            /* mount point for filesystem */
215         xfs_ino_t       ino,            /* inode number to get data for */
216         void            __user *buffer, /* buffer to place output in */
217         int             ubsize,         /* size of buffer */
218         bulkstat_one_fmt_pf formatter,  /* formatter, copy to user */
219         xfs_daddr_t     bno,            /* starting bno of inode cluster */
220         int             *ubused,        /* bytes used by me */
221         void            *dibuff,        /* on-disk inode buffer */
222         int             *stat)          /* BULKSTAT_RV_... */
223 {
224         xfs_bstat_t     *buf;           /* return buffer */
225         int             error = 0;      /* error value */
226         xfs_dinode_t    *dip;           /* dinode inode pointer */
227
228         dip = (xfs_dinode_t *)dibuff;
229         *stat = BULKSTAT_RV_NOTHING;
230
231         if (!buffer || xfs_internal_inum(mp, ino))
232                 return XFS_ERROR(EINVAL);
233
234         buf = kmem_alloc(sizeof(*buf), KM_SLEEP);
235
236         if (dip == NULL) {
237                 /* We're not being passed a pointer to a dinode.  This happens
238                  * if BULKSTAT_FG_IGET is selected.  Do the iget.
239                  */
240                 error = xfs_bulkstat_one_iget(mp, ino, bno, buf, stat);
241                 if (error)
242                         goto out_free;
243         } else {
244                 xfs_bulkstat_one_dinode(mp, ino, dip, buf);
245         }
246
247         error = formatter(buffer, ubsize, ubused, buf);
248         if (error)
249                 goto out_free;
250
251         *stat = BULKSTAT_RV_DIDONE;
252
253  out_free:
254         kmem_free(buf);
255         return error;
256 }
257
258 int
259 xfs_bulkstat_one(
260         xfs_mount_t     *mp,            /* mount point for filesystem */
261         xfs_ino_t       ino,            /* inode number to get data for */
262         void            __user *buffer, /* buffer to place output in */
263         int             ubsize,         /* size of buffer */
264         void            *private_data,  /* my private data */
265         xfs_daddr_t     bno,            /* starting bno of inode cluster */
266         int             *ubused,        /* bytes used by me */
267         void            *dibuff,        /* on-disk inode buffer */
268         int             *stat)          /* BULKSTAT_RV_... */
269 {
270         return xfs_bulkstat_one_int(mp, ino, buffer, ubsize,
271                                     xfs_bulkstat_one_fmt, bno,
272                                     ubused, dibuff, stat);
273 }
274
275 /*
276  * Test to see whether we can use the ondisk inode directly, based
277  * on the given bulkstat flags, filling in dipp accordingly.
278  * Returns zero if the inode is dodgey.
279  */
280 STATIC int
281 xfs_bulkstat_use_dinode(
282         xfs_mount_t     *mp,
283         int             flags,
284         xfs_buf_t       *bp,
285         int             clustidx,
286         xfs_dinode_t    **dipp)
287 {
288         xfs_dinode_t    *dip;
289         unsigned int    aformat;
290
291         *dipp = NULL;
292         if (!bp || (flags & BULKSTAT_FG_IGET))
293                 return 1;
294         dip = (xfs_dinode_t *)
295                         xfs_buf_offset(bp, clustidx << mp->m_sb.sb_inodelog);
296         /*
297          * Check the buffer containing the on-disk inode for di_mode == 0.
298          * This is to prevent xfs_bulkstat from picking up just reclaimed
299          * inodes that have their in-core state initialized but not flushed
300          * to disk yet. This is a temporary hack that would require a proper
301          * fix in the future.
302          */
303         if (be16_to_cpu(dip->di_magic) != XFS_DINODE_MAGIC ||
304             !XFS_DINODE_GOOD_VERSION(dip->di_version) ||
305             !dip->di_mode)
306                 return 0;
307         if (flags & BULKSTAT_FG_QUICK) {
308                 *dipp = dip;
309                 return 1;
310         }
311         /* BULKSTAT_FG_INLINE: if attr fork is local, or not there, use it */
312         aformat = dip->di_aformat;
313         if ((XFS_DFORK_Q(dip) == 0) ||
314             (aformat == XFS_DINODE_FMT_LOCAL) ||
315             (aformat == XFS_DINODE_FMT_EXTENTS && !dip->di_anextents)) {
316                 *dipp = dip;
317                 return 1;
318         }
319         return 1;
320 }
321
322 #define XFS_BULKSTAT_UBLEFT(ubleft)     ((ubleft) >= statstruct_size)
323
324 /*
325  * Return stat information in bulk (by-inode) for the filesystem.
326  */
327 int                                     /* error status */
328 xfs_bulkstat(
329         xfs_mount_t             *mp,    /* mount point for filesystem */
330         xfs_ino_t               *lastinop, /* last inode returned */
331         int                     *ubcountp, /* size of buffer/count returned */
332         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
333         void                    *private_data,/* private data for formatter */
334         size_t                  statstruct_size, /* sizeof struct filling */
335         char                    __user *ubuffer, /* buffer with inode stats */
336         int                     flags,  /* defined in xfs_itable.h */
337         int                     *done)  /* 1 if there are more stats to get */
338 {
339         xfs_agblock_t           agbno=0;/* allocation group block number */
340         xfs_buf_t               *agbp;  /* agi header buffer */
341         xfs_agi_t               *agi;   /* agi header data */
342         xfs_agino_t             agino;  /* inode # in allocation group */
343         xfs_agnumber_t          agno;   /* allocation group number */
344         xfs_daddr_t             bno;    /* inode cluster start daddr */
345         int                     chunkidx; /* current index into inode chunk */
346         int                     clustidx; /* current index into inode cluster */
347         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
348         int                     end_of_ag; /* set if we've seen the ag end */
349         int                     error;  /* error code */
350         int                     fmterror;/* bulkstat formatter result */
351         __int32_t               gcnt;   /* current btree rec's count */
352         xfs_inofree_t           gfree;  /* current btree rec's free mask */
353         xfs_agino_t             gino;   /* current btree rec's start inode */
354         int                     i;      /* loop index */
355         int                     icount; /* count of inodes good in irbuf */
356         size_t                  irbsize; /* size of irec buffer in bytes */
357         xfs_ino_t               ino;    /* inode number (filesystem) */
358         xfs_inobt_rec_incore_t  *irbp;  /* current irec buffer pointer */
359         xfs_inobt_rec_incore_t  *irbuf; /* start of irec buffer */
360         xfs_inobt_rec_incore_t  *irbufend; /* end of good irec buffer entries */
361         xfs_ino_t               lastino; /* last inode number returned */
362         int                     nbcluster; /* # of blocks in a cluster */
363         int                     nicluster; /* # of inodes in a cluster */
364         int                     nimask; /* mask for inode clusters */
365         int                     nirbuf; /* size of irbuf */
366         int                     rval;   /* return value error code */
367         int                     tmp;    /* result value from btree calls */
368         int                     ubcount; /* size of user's buffer */
369         int                     ubleft; /* bytes left in user's buffer */
370         char                    __user *ubufp;  /* pointer into user's buffer */
371         int                     ubelem; /* spaces used in user's buffer */
372         int                     ubused; /* bytes used by formatter */
373         xfs_buf_t               *bp;    /* ptr to on-disk inode cluster buf */
374         xfs_dinode_t            *dip;   /* ptr into bp for specific inode */
375
376         /*
377          * Get the last inode value, see if there's nothing to do.
378          */
379         ino = (xfs_ino_t)*lastinop;
380         lastino = ino;
381         dip = NULL;
382         agno = XFS_INO_TO_AGNO(mp, ino);
383         agino = XFS_INO_TO_AGINO(mp, ino);
384         if (agno >= mp->m_sb.sb_agcount ||
385             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
386                 *done = 1;
387                 *ubcountp = 0;
388                 return 0;
389         }
390         if (!ubcountp || *ubcountp <= 0) {
391                 return EINVAL;
392         }
393         ubcount = *ubcountp; /* statstruct's */
394         ubleft = ubcount * statstruct_size; /* bytes */
395         *ubcountp = ubelem = 0;
396         *done = 0;
397         fmterror = 0;
398         ubufp = ubuffer;
399         nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
400                 mp->m_sb.sb_inopblock :
401                 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
402         nimask = ~(nicluster - 1);
403         nbcluster = nicluster >> mp->m_sb.sb_inopblog;
404         irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4,
405                                    KM_SLEEP | KM_MAYFAIL | KM_LARGE);
406         nirbuf = irbsize / sizeof(*irbuf);
407
408         /*
409          * Loop over the allocation groups, starting from the last
410          * inode returned; 0 means start of the allocation group.
411          */
412         rval = 0;
413         while (XFS_BULKSTAT_UBLEFT(ubleft) && agno < mp->m_sb.sb_agcount) {
414                 cond_resched();
415                 bp = NULL;
416                 down_read(&mp->m_peraglock);
417                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
418                 up_read(&mp->m_peraglock);
419                 if (error) {
420                         /*
421                          * Skip this allocation group and go to the next one.
422                          */
423                         agno++;
424                         agino = 0;
425                         continue;
426                 }
427                 agi = XFS_BUF_TO_AGI(agbp);
428                 /*
429                  * Allocate and initialize a btree cursor for ialloc btree.
430                  */
431                 cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno);
432                 irbp = irbuf;
433                 irbufend = irbuf + nirbuf;
434                 end_of_ag = 0;
435                 /*
436                  * If we're returning in the middle of an allocation group,
437                  * we need to get the remainder of the chunk we're in.
438                  */
439                 if (agino > 0) {
440                         /*
441                          * Lookup the inode chunk that this inode lives in.
442                          */
443                         error = xfs_inobt_lookup_le(cur, agino, 0, 0, &tmp);
444                         if (!error &&   /* no I/O error */
445                             tmp &&      /* lookup succeeded */
446                                         /* got the record, should always work */
447                             !(error = xfs_inobt_get_rec(cur, &gino, &gcnt,
448                                     &gfree, &i)) &&
449                             i == 1 &&
450                                         /* this is the right chunk */
451                             agino < gino + XFS_INODES_PER_CHUNK &&
452                                         /* lastino was not last in chunk */
453                             (chunkidx = agino - gino + 1) <
454                                     XFS_INODES_PER_CHUNK &&
455                                         /* there are some left allocated */
456                             xfs_inobt_maskn(chunkidx,
457                                     XFS_INODES_PER_CHUNK - chunkidx) & ~gfree) {
458                                 /*
459                                  * Grab the chunk record.  Mark all the
460                                  * uninteresting inodes (because they're
461                                  * before our start point) free.
462                                  */
463                                 for (i = 0; i < chunkidx; i++) {
464                                         if (XFS_INOBT_MASK(i) & ~gfree)
465                                                 gcnt++;
466                                 }
467                                 gfree |= xfs_inobt_maskn(0, chunkidx);
468                                 irbp->ir_startino = gino;
469                                 irbp->ir_freecount = gcnt;
470                                 irbp->ir_free = gfree;
471                                 irbp++;
472                                 agino = gino + XFS_INODES_PER_CHUNK;
473                                 icount = XFS_INODES_PER_CHUNK - gcnt;
474                         } else {
475                                 /*
476                                  * If any of those tests failed, bump the
477                                  * inode number (just in case).
478                                  */
479                                 agino++;
480                                 icount = 0;
481                         }
482                         /*
483                          * In any case, increment to the next record.
484                          */
485                         if (!error)
486                                 error = xfs_btree_increment(cur, 0, &tmp);
487                 } else {
488                         /*
489                          * Start of ag.  Lookup the first inode chunk.
490                          */
491                         error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &tmp);
492                         icount = 0;
493                 }
494                 /*
495                  * Loop through inode btree records in this ag,
496                  * until we run out of inodes or space in the buffer.
497                  */
498                 while (irbp < irbufend && icount < ubcount) {
499                         /*
500                          * Loop as long as we're unable to read the
501                          * inode btree.
502                          */
503                         while (error) {
504                                 agino += XFS_INODES_PER_CHUNK;
505                                 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
506                                                 be32_to_cpu(agi->agi_length))
507                                         break;
508                                 error = xfs_inobt_lookup_ge(cur, agino, 0, 0,
509                                                             &tmp);
510                                 cond_resched();
511                         }
512                         /*
513                          * If ran off the end of the ag either with an error,
514                          * or the normal way, set end and stop collecting.
515                          */
516                         if (error ||
517                             (error = xfs_inobt_get_rec(cur, &gino, &gcnt,
518                                     &gfree, &i)) ||
519                             i == 0) {
520                                 end_of_ag = 1;
521                                 break;
522                         }
523                         /*
524                          * If this chunk has any allocated inodes, save it.
525                          * Also start read-ahead now for this chunk.
526                          */
527                         if (gcnt < XFS_INODES_PER_CHUNK) {
528                                 /*
529                                  * Loop over all clusters in the next chunk.
530                                  * Do a readahead if there are any allocated
531                                  * inodes in that cluster.
532                                  */
533                                 for (agbno = XFS_AGINO_TO_AGBNO(mp, gino),
534                                      chunkidx = 0;
535                                      chunkidx < XFS_INODES_PER_CHUNK;
536                                      chunkidx += nicluster,
537                                      agbno += nbcluster) {
538                                         if (xfs_inobt_maskn(chunkidx,
539                                                             nicluster) & ~gfree)
540                                                 xfs_btree_reada_bufs(mp, agno,
541                                                         agbno, nbcluster);
542                                 }
543                                 irbp->ir_startino = gino;
544                                 irbp->ir_freecount = gcnt;
545                                 irbp->ir_free = gfree;
546                                 irbp++;
547                                 icount += XFS_INODES_PER_CHUNK - gcnt;
548                         }
549                         /*
550                          * Set agino to after this chunk and bump the cursor.
551                          */
552                         agino = gino + XFS_INODES_PER_CHUNK;
553                         error = xfs_btree_increment(cur, 0, &tmp);
554                         cond_resched();
555                 }
556                 /*
557                  * Drop the btree buffers and the agi buffer.
558                  * We can't hold any of the locks these represent
559                  * when calling iget.
560                  */
561                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
562                 xfs_buf_relse(agbp);
563                 /*
564                  * Now format all the good inodes into the user's buffer.
565                  */
566                 irbufend = irbp;
567                 for (irbp = irbuf;
568                      irbp < irbufend && XFS_BULKSTAT_UBLEFT(ubleft); irbp++) {
569                         /*
570                          * Now process this chunk of inodes.
571                          */
572                         for (agino = irbp->ir_startino, chunkidx = clustidx = 0;
573                              XFS_BULKSTAT_UBLEFT(ubleft) &&
574                                 irbp->ir_freecount < XFS_INODES_PER_CHUNK;
575                              chunkidx++, clustidx++, agino++) {
576                                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
577                                 /*
578                                  * Recompute agbno if this is the
579                                  * first inode of the cluster.
580                                  *
581                                  * Careful with clustidx.   There can be
582                                  * multple clusters per chunk, a single
583                                  * cluster per chunk or a cluster that has
584                                  * inodes represented from several different
585                                  * chunks (if blocksize is large).
586                                  *
587                                  * Because of this, the starting clustidx is
588                                  * initialized to zero in this loop but must
589                                  * later be reset after reading in the cluster
590                                  * buffer.
591                                  */
592                                 if ((chunkidx & (nicluster - 1)) == 0) {
593                                         agbno = XFS_AGINO_TO_AGBNO(mp,
594                                                         irbp->ir_startino) +
595                                                 ((chunkidx & nimask) >>
596                                                  mp->m_sb.sb_inopblog);
597
598                                         if (flags & (BULKSTAT_FG_QUICK |
599                                                      BULKSTAT_FG_INLINE)) {
600                                                 int offset;
601
602                                                 ino = XFS_AGINO_TO_INO(mp, agno,
603                                                                        agino);
604                                                 bno = XFS_AGB_TO_DADDR(mp, agno,
605                                                                        agbno);
606
607                                                 /*
608                                                  * Get the inode cluster buffer
609                                                  */
610                                                 if (bp)
611                                                         xfs_buf_relse(bp);
612
613                                                 error = xfs_inotobp(mp, NULL, ino, &dip,
614                                                                     &bp, &offset,
615                                                                     XFS_IGET_BULKSTAT);
616
617                                                 if (!error)
618                                                         clustidx = offset / mp->m_sb.sb_inodesize;
619                                                 if (XFS_TEST_ERROR(error != 0,
620                                                                    mp, XFS_ERRTAG_BULKSTAT_READ_CHUNK,
621                                                                    XFS_RANDOM_BULKSTAT_READ_CHUNK)) {
622                                                         bp = NULL;
623                                                         ubleft = 0;
624                                                         rval = error;
625                                                         break;
626                                                 }
627                                         }
628                                 }
629                                 ino = XFS_AGINO_TO_INO(mp, agno, agino);
630                                 bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
631                                 /*
632                                  * Skip if this inode is free.
633                                  */
634                                 if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free) {
635                                         lastino = ino;
636                                         continue;
637                                 }
638                                 /*
639                                  * Count used inodes as free so we can tell
640                                  * when the chunk is used up.
641                                  */
642                                 irbp->ir_freecount++;
643                                 if (!xfs_bulkstat_use_dinode(mp, flags, bp,
644                                                              clustidx, &dip)) {
645                                         lastino = ino;
646                                         continue;
647                                 }
648                                 /*
649                                  * If we need to do an iget, cannot hold bp.
650                                  * Drop it, until starting the next cluster.
651                                  */
652                                 if ((flags & BULKSTAT_FG_INLINE) && !dip) {
653                                         if (bp)
654                                                 xfs_buf_relse(bp);
655                                         bp = NULL;
656                                 }
657
658                                 /*
659                                  * Get the inode and fill in a single buffer.
660                                  * BULKSTAT_FG_QUICK uses dip to fill it in.
661                                  * BULKSTAT_FG_IGET uses igets.
662                                  * BULKSTAT_FG_INLINE uses dip if we have an
663                                  * inline attr fork, else igets.
664                                  * See: xfs_bulkstat_one & xfs_dm_bulkstat_one.
665                                  * This is also used to count inodes/blks, etc
666                                  * in xfs_qm_quotacheck.
667                                  */
668                                 ubused = statstruct_size;
669                                 error = formatter(mp, ino, ubufp,
670                                                 ubleft, private_data,
671                                                 bno, &ubused, dip, &fmterror);
672                                 if (fmterror == BULKSTAT_RV_NOTHING) {
673                                         if (error && error != ENOENT &&
674                                                 error != EINVAL) {
675                                                 ubleft = 0;
676                                                 rval = error;
677                                                 break;
678                                         }
679                                         lastino = ino;
680                                         continue;
681                                 }
682                                 if (fmterror == BULKSTAT_RV_GIVEUP) {
683                                         ubleft = 0;
684                                         ASSERT(error);
685                                         rval = error;
686                                         break;
687                                 }
688                                 if (ubufp)
689                                         ubufp += ubused;
690                                 ubleft -= ubused;
691                                 ubelem++;
692                                 lastino = ino;
693                         }
694
695                         cond_resched();
696                 }
697
698                 if (bp)
699                         xfs_buf_relse(bp);
700
701                 /*
702                  * Set up for the next loop iteration.
703                  */
704                 if (XFS_BULKSTAT_UBLEFT(ubleft)) {
705                         if (end_of_ag) {
706                                 agno++;
707                                 agino = 0;
708                         } else
709                                 agino = XFS_INO_TO_AGINO(mp, lastino);
710                 } else
711                         break;
712         }
713         /*
714          * Done, we're either out of filesystem or space to put the data.
715          */
716         kmem_free(irbuf);
717         *ubcountp = ubelem;
718         /*
719          * Found some inodes, return them now and return the error next time.
720          */
721         if (ubelem)
722                 rval = 0;
723         if (agno >= mp->m_sb.sb_agcount) {
724                 /*
725                  * If we ran out of filesystem, mark lastino as off
726                  * the end of the filesystem, so the next call
727                  * will return immediately.
728                  */
729                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
730                 *done = 1;
731         } else
732                 *lastinop = (xfs_ino_t)lastino;
733
734         return rval;
735 }
736
737 /*
738  * Return stat information in bulk (by-inode) for the filesystem.
739  * Special case for non-sequential one inode bulkstat.
740  */
741 int                                     /* error status */
742 xfs_bulkstat_single(
743         xfs_mount_t             *mp,    /* mount point for filesystem */
744         xfs_ino_t               *lastinop, /* inode to return */
745         char                    __user *buffer, /* buffer with inode stats */
746         int                     *done)  /* 1 if there are more stats to get */
747 {
748         int                     count;  /* count value for bulkstat call */
749         int                     error;  /* return value */
750         xfs_ino_t               ino;    /* filesystem inode number */
751         int                     res;    /* result from bs1 */
752
753         /*
754          * note that requesting valid inode numbers which are not allocated
755          * to inodes will most likely cause xfs_itobp to generate warning
756          * messages about bad magic numbers. This is ok. The fact that
757          * the inode isn't actually an inode is handled by the
758          * error check below. Done this way to make the usual case faster
759          * at the expense of the error case.
760          */
761
762         ino = (xfs_ino_t)*lastinop;
763         error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t),
764                                  NULL, 0, NULL, NULL, &res);
765         if (error) {
766                 /*
767                  * Special case way failed, do it the "long" way
768                  * to see if that works.
769                  */
770                 (*lastinop)--;
771                 count = 1;
772                 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
773                                 NULL, sizeof(xfs_bstat_t), buffer,
774                                 BULKSTAT_FG_IGET, done))
775                         return error;
776                 if (count == 0 || (xfs_ino_t)*lastinop != ino)
777                         return error == EFSCORRUPTED ?
778                                 XFS_ERROR(EINVAL) : error;
779                 else
780                         return 0;
781         }
782         *done = 0;
783         return 0;
784 }
785
786 int
787 xfs_inumbers_fmt(
788         void                    __user *ubuffer, /* buffer to write to */
789         const xfs_inogrp_t      *buffer,        /* buffer to read from */
790         long                    count,          /* # of elements to read */
791         long                    *written)       /* # of bytes written */
792 {
793         if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer)))
794                 return -EFAULT;
795         *written = count * sizeof(*buffer);
796         return 0;
797 }
798
799 /*
800  * Return inode number table for the filesystem.
801  */
802 int                                     /* error status */
803 xfs_inumbers(
804         xfs_mount_t     *mp,            /* mount point for filesystem */
805         xfs_ino_t       *lastino,       /* last inode returned */
806         int             *count,         /* size of buffer/count returned */
807         void            __user *ubuffer,/* buffer with inode descriptions */
808         inumbers_fmt_pf formatter)
809 {
810         xfs_buf_t       *agbp;
811         xfs_agino_t     agino;
812         xfs_agnumber_t  agno;
813         int             bcount;
814         xfs_inogrp_t    *buffer;
815         int             bufidx;
816         xfs_btree_cur_t *cur;
817         int             error;
818         __int32_t       gcnt;
819         xfs_inofree_t   gfree;
820         xfs_agino_t     gino;
821         int             i;
822         xfs_ino_t       ino;
823         int             left;
824         int             tmp;
825
826         ino = (xfs_ino_t)*lastino;
827         agno = XFS_INO_TO_AGNO(mp, ino);
828         agino = XFS_INO_TO_AGINO(mp, ino);
829         left = *count;
830         *count = 0;
831         bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)));
832         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
833         error = bufidx = 0;
834         cur = NULL;
835         agbp = NULL;
836         while (left > 0 && agno < mp->m_sb.sb_agcount) {
837                 if (agbp == NULL) {
838                         down_read(&mp->m_peraglock);
839                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
840                         up_read(&mp->m_peraglock);
841                         if (error) {
842                                 /*
843                                  * If we can't read the AGI of this ag,
844                                  * then just skip to the next one.
845                                  */
846                                 ASSERT(cur == NULL);
847                                 agbp = NULL;
848                                 agno++;
849                                 agino = 0;
850                                 continue;
851                         }
852                         cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno);
853                         error = xfs_inobt_lookup_ge(cur, agino, 0, 0, &tmp);
854                         if (error) {
855                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
856                                 cur = NULL;
857                                 xfs_buf_relse(agbp);
858                                 agbp = NULL;
859                                 /*
860                                  * Move up the last inode in the current
861                                  * chunk.  The lookup_ge will always get
862                                  * us the first inode in the next chunk.
863                                  */
864                                 agino += XFS_INODES_PER_CHUNK - 1;
865                                 continue;
866                         }
867                 }
868                 if ((error = xfs_inobt_get_rec(cur, &gino, &gcnt, &gfree,
869                         &i)) ||
870                     i == 0) {
871                         xfs_buf_relse(agbp);
872                         agbp = NULL;
873                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
874                         cur = NULL;
875                         agno++;
876                         agino = 0;
877                         continue;
878                 }
879                 agino = gino + XFS_INODES_PER_CHUNK - 1;
880                 buffer[bufidx].xi_startino = XFS_AGINO_TO_INO(mp, agno, gino);
881                 buffer[bufidx].xi_alloccount = XFS_INODES_PER_CHUNK - gcnt;
882                 buffer[bufidx].xi_allocmask = ~gfree;
883                 bufidx++;
884                 left--;
885                 if (bufidx == bcount) {
886                         long written;
887                         if (formatter(ubuffer, buffer, bufidx, &written)) {
888                                 error = XFS_ERROR(EFAULT);
889                                 break;
890                         }
891                         ubuffer += written;
892                         *count += bufidx;
893                         bufidx = 0;
894                 }
895                 if (left) {
896                         error = xfs_btree_increment(cur, 0, &tmp);
897                         if (error) {
898                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
899                                 cur = NULL;
900                                 xfs_buf_relse(agbp);
901                                 agbp = NULL;
902                                 /*
903                                  * The agino value has already been bumped.
904                                  * Just try to skip up to it.
905                                  */
906                                 agino += XFS_INODES_PER_CHUNK;
907                                 continue;
908                         }
909                 }
910         }
911         if (!error) {
912                 if (bufidx) {
913                         long written;
914                         if (formatter(ubuffer, buffer, bufidx, &written))
915                                 error = XFS_ERROR(EFAULT);
916                         else
917                                 *count += bufidx;
918                 }
919                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
920         }
921         kmem_free(buffer);
922         if (cur)
923                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
924                                            XFS_BTREE_NOERROR));
925         if (agbp)
926                 xfs_buf_relse(agbp);
927         return error;
928 }