Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-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         /*
87          * We are reading the atime from the Linux inode because the
88          * dinode might not be uptodate.
89          */
90         buf->bs_atime.tv_sec = VFS_I(ip)->i_atime.tv_sec;
91         buf->bs_atime.tv_nsec = VFS_I(ip)->i_atime.tv_nsec;
92         buf->bs_mtime.tv_sec = dic->di_mtime.t_sec;
93         buf->bs_mtime.tv_nsec = dic->di_mtime.t_nsec;
94         buf->bs_ctime.tv_sec = dic->di_ctime.t_sec;
95         buf->bs_ctime.tv_nsec = dic->di_ctime.t_nsec;
96         buf->bs_xflags = xfs_ip2xflags(ip);
97         buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
98         buf->bs_extents = dic->di_nextents;
99         buf->bs_gen = dic->di_gen;
100         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
101         buf->bs_dmevmask = dic->di_dmevmask;
102         buf->bs_dmstate = dic->di_dmstate;
103         buf->bs_aextents = dic->di_anextents;
104
105         switch (dic->di_format) {
106         case XFS_DINODE_FMT_DEV:
107                 buf->bs_rdev = ip->i_df.if_u2.if_rdev;
108                 buf->bs_blksize = BLKDEV_IOSIZE;
109                 buf->bs_blocks = 0;
110                 break;
111         case XFS_DINODE_FMT_LOCAL:
112         case XFS_DINODE_FMT_UUID:
113                 buf->bs_rdev = 0;
114                 buf->bs_blksize = mp->m_sb.sb_blocksize;
115                 buf->bs_blocks = 0;
116                 break;
117         case XFS_DINODE_FMT_EXTENTS:
118         case XFS_DINODE_FMT_BTREE:
119                 buf->bs_rdev = 0;
120                 buf->bs_blksize = mp->m_sb.sb_blocksize;
121                 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
122                 break;
123         }
124
125         xfs_iput(ip, XFS_ILOCK_SHARED);
126         return error;
127 }
128
129 STATIC void
130 xfs_bulkstat_one_dinode(
131         xfs_mount_t     *mp,            /* mount point for filesystem */
132         xfs_ino_t       ino,            /* inode number to get data for */
133         xfs_dinode_t    *dic,           /* dinode inode pointer */
134         xfs_bstat_t     *buf)           /* return buffer */
135 {
136         /*
137          * The inode format changed when we moved the link count and
138          * made it 32 bits long.  If this is an old format inode,
139          * convert it in memory to look like a new one.  If it gets
140          * flushed to disk we will convert back before flushing or
141          * logging it.  We zero out the new projid field and the old link
142          * count field.  We'll handle clearing the pad field (the remains
143          * of the old uuid field) when we actually convert the inode to
144          * the new format. We don't change the version number so that we
145          * can distinguish this from a real new format inode.
146          */
147         if (dic->di_version == 1) {
148                 buf->bs_nlink = be16_to_cpu(dic->di_onlink);
149                 buf->bs_projid = 0;
150         } else {
151                 buf->bs_nlink = be32_to_cpu(dic->di_nlink);
152                 buf->bs_projid = be16_to_cpu(dic->di_projid);
153         }
154
155         buf->bs_ino = ino;
156         buf->bs_mode = be16_to_cpu(dic->di_mode);
157         buf->bs_uid = be32_to_cpu(dic->di_uid);
158         buf->bs_gid = be32_to_cpu(dic->di_gid);
159         buf->bs_size = be64_to_cpu(dic->di_size);
160         buf->bs_atime.tv_sec = be32_to_cpu(dic->di_atime.t_sec);
161         buf->bs_atime.tv_nsec = be32_to_cpu(dic->di_atime.t_nsec);
162         buf->bs_mtime.tv_sec = be32_to_cpu(dic->di_mtime.t_sec);
163         buf->bs_mtime.tv_nsec = be32_to_cpu(dic->di_mtime.t_nsec);
164         buf->bs_ctime.tv_sec = be32_to_cpu(dic->di_ctime.t_sec);
165         buf->bs_ctime.tv_nsec = be32_to_cpu(dic->di_ctime.t_nsec);
166         buf->bs_xflags = xfs_dic2xflags(dic);
167         buf->bs_extsize = be32_to_cpu(dic->di_extsize) << mp->m_sb.sb_blocklog;
168         buf->bs_extents = be32_to_cpu(dic->di_nextents);
169         buf->bs_gen = be32_to_cpu(dic->di_gen);
170         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
171         buf->bs_dmevmask = be32_to_cpu(dic->di_dmevmask);
172         buf->bs_dmstate = be16_to_cpu(dic->di_dmstate);
173         buf->bs_aextents = be16_to_cpu(dic->di_anextents);
174
175         switch (dic->di_format) {
176         case XFS_DINODE_FMT_DEV:
177                 buf->bs_rdev = xfs_dinode_get_rdev(dic);
178                 buf->bs_blksize = BLKDEV_IOSIZE;
179                 buf->bs_blocks = 0;
180                 break;
181         case XFS_DINODE_FMT_LOCAL:
182         case XFS_DINODE_FMT_UUID:
183                 buf->bs_rdev = 0;
184                 buf->bs_blksize = mp->m_sb.sb_blocksize;
185                 buf->bs_blocks = 0;
186                 break;
187         case XFS_DINODE_FMT_EXTENTS:
188         case XFS_DINODE_FMT_BTREE:
189                 buf->bs_rdev = 0;
190                 buf->bs_blksize = mp->m_sb.sb_blocksize;
191                 buf->bs_blocks = be64_to_cpu(dic->di_nblocks);
192                 break;
193         }
194 }
195
196 /* Return 0 on success or positive error */
197 STATIC int
198 xfs_bulkstat_one_fmt(
199         void                    __user *ubuffer,
200         int                     ubsize,
201         int                     *ubused,
202         const xfs_bstat_t       *buffer)
203 {
204         if (ubsize < sizeof(*buffer))
205                 return XFS_ERROR(ENOMEM);
206         if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
207                 return XFS_ERROR(EFAULT);
208         if (ubused)
209                 *ubused = sizeof(*buffer);
210         return 0;
211 }
212
213 /*
214  * Return stat information for one inode.
215  * Return 0 if ok, else errno.
216  */
217 int                                     /* error status */
218 xfs_bulkstat_one_int(
219         xfs_mount_t     *mp,            /* mount point for filesystem */
220         xfs_ino_t       ino,            /* inode number to get data for */
221         void            __user *buffer, /* buffer to place output in */
222         int             ubsize,         /* size of buffer */
223         bulkstat_one_fmt_pf formatter,  /* formatter, copy to user */
224         xfs_daddr_t     bno,            /* starting bno of inode cluster */
225         int             *ubused,        /* bytes used by me */
226         void            *dibuff,        /* on-disk inode buffer */
227         int             *stat)          /* BULKSTAT_RV_... */
228 {
229         xfs_bstat_t     *buf;           /* return buffer */
230         int             error = 0;      /* error value */
231         xfs_dinode_t    *dip;           /* dinode inode pointer */
232
233         dip = (xfs_dinode_t *)dibuff;
234         *stat = BULKSTAT_RV_NOTHING;
235
236         if (!buffer || xfs_internal_inum(mp, ino))
237                 return XFS_ERROR(EINVAL);
238
239         buf = kmem_alloc(sizeof(*buf), KM_SLEEP);
240
241         if (dip == NULL) {
242                 /* We're not being passed a pointer to a dinode.  This happens
243                  * if BULKSTAT_FG_IGET is selected.  Do the iget.
244                  */
245                 error = xfs_bulkstat_one_iget(mp, ino, bno, buf, stat);
246                 if (error)
247                         goto out_free;
248         } else {
249                 xfs_bulkstat_one_dinode(mp, ino, dip, buf);
250         }
251
252         error = formatter(buffer, ubsize, ubused, buf);
253         if (error)
254                 goto out_free;
255
256         *stat = BULKSTAT_RV_DIDONE;
257
258  out_free:
259         kmem_free(buf);
260         return error;
261 }
262
263 int
264 xfs_bulkstat_one(
265         xfs_mount_t     *mp,            /* mount point for filesystem */
266         xfs_ino_t       ino,            /* inode number to get data for */
267         void            __user *buffer, /* buffer to place output in */
268         int             ubsize,         /* size of buffer */
269         void            *private_data,  /* my private data */
270         xfs_daddr_t     bno,            /* starting bno of inode cluster */
271         int             *ubused,        /* bytes used by me */
272         void            *dibuff,        /* on-disk inode buffer */
273         int             *stat)          /* BULKSTAT_RV_... */
274 {
275         return xfs_bulkstat_one_int(mp, ino, buffer, ubsize,
276                                     xfs_bulkstat_one_fmt, bno,
277                                     ubused, dibuff, stat);
278 }
279
280 /*
281  * Test to see whether we can use the ondisk inode directly, based
282  * on the given bulkstat flags, filling in dipp accordingly.
283  * Returns zero if the inode is dodgey.
284  */
285 STATIC int
286 xfs_bulkstat_use_dinode(
287         xfs_mount_t     *mp,
288         int             flags,
289         xfs_buf_t       *bp,
290         int             clustidx,
291         xfs_dinode_t    **dipp)
292 {
293         xfs_dinode_t    *dip;
294         unsigned int    aformat;
295
296         *dipp = NULL;
297         if (!bp || (flags & BULKSTAT_FG_IGET))
298                 return 1;
299         dip = (xfs_dinode_t *)
300                         xfs_buf_offset(bp, clustidx << mp->m_sb.sb_inodelog);
301         /*
302          * Check the buffer containing the on-disk inode for di_mode == 0.
303          * This is to prevent xfs_bulkstat from picking up just reclaimed
304          * inodes that have their in-core state initialized but not flushed
305          * to disk yet. This is a temporary hack that would require a proper
306          * fix in the future.
307          */
308         if (be16_to_cpu(dip->di_magic) != XFS_DINODE_MAGIC ||
309             !XFS_DINODE_GOOD_VERSION(dip->di_version) ||
310             !dip->di_mode)
311                 return 0;
312         if (flags & BULKSTAT_FG_QUICK) {
313                 *dipp = dip;
314                 return 1;
315         }
316         /* BULKSTAT_FG_INLINE: if attr fork is local, or not there, use it */
317         aformat = dip->di_aformat;
318         if ((XFS_DFORK_Q(dip) == 0) ||
319             (aformat == XFS_DINODE_FMT_LOCAL) ||
320             (aformat == XFS_DINODE_FMT_EXTENTS && !dip->di_anextents)) {
321                 *dipp = dip;
322                 return 1;
323         }
324         return 1;
325 }
326
327 #define XFS_BULKSTAT_UBLEFT(ubleft)     ((ubleft) >= statstruct_size)
328
329 /*
330  * Return stat information in bulk (by-inode) for the filesystem.
331  */
332 int                                     /* error status */
333 xfs_bulkstat(
334         xfs_mount_t             *mp,    /* mount point for filesystem */
335         xfs_ino_t               *lastinop, /* last inode returned */
336         int                     *ubcountp, /* size of buffer/count returned */
337         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
338         void                    *private_data,/* private data for formatter */
339         size_t                  statstruct_size, /* sizeof struct filling */
340         char                    __user *ubuffer, /* buffer with inode stats */
341         int                     flags,  /* defined in xfs_itable.h */
342         int                     *done)  /* 1 if there are more stats to get */
343 {
344         xfs_agblock_t           agbno=0;/* allocation group block number */
345         xfs_buf_t               *agbp;  /* agi header buffer */
346         xfs_agi_t               *agi;   /* agi header data */
347         xfs_agino_t             agino;  /* inode # in allocation group */
348         xfs_agnumber_t          agno;   /* allocation group number */
349         xfs_daddr_t             bno;    /* inode cluster start daddr */
350         int                     chunkidx; /* current index into inode chunk */
351         int                     clustidx; /* current index into inode cluster */
352         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
353         int                     end_of_ag; /* set if we've seen the ag end */
354         int                     error;  /* error code */
355         int                     fmterror;/* bulkstat formatter result */
356         __int32_t               gcnt;   /* current btree rec's count */
357         xfs_inofree_t           gfree;  /* current btree rec's free mask */
358         xfs_agino_t             gino;   /* current btree rec's start inode */
359         int                     i;      /* loop index */
360         int                     icount; /* count of inodes good in irbuf */
361         size_t                  irbsize; /* size of irec buffer in bytes */
362         xfs_ino_t               ino;    /* inode number (filesystem) */
363         xfs_inobt_rec_incore_t  *irbp;  /* current irec buffer pointer */
364         xfs_inobt_rec_incore_t  *irbuf; /* start of irec buffer */
365         xfs_inobt_rec_incore_t  *irbufend; /* end of good irec buffer entries */
366         xfs_ino_t               lastino; /* last inode number returned */
367         int                     nbcluster; /* # of blocks in a cluster */
368         int                     nicluster; /* # of inodes in a cluster */
369         int                     nimask; /* mask for inode clusters */
370         int                     nirbuf; /* size of irbuf */
371         int                     rval;   /* return value error code */
372         int                     tmp;    /* result value from btree calls */
373         int                     ubcount; /* size of user's buffer */
374         int                     ubleft; /* bytes left in user's buffer */
375         char                    __user *ubufp;  /* pointer into user's buffer */
376         int                     ubelem; /* spaces used in user's buffer */
377         int                     ubused; /* bytes used by formatter */
378         xfs_buf_t               *bp;    /* ptr to on-disk inode cluster buf */
379         xfs_dinode_t            *dip;   /* ptr into bp for specific inode */
380
381         /*
382          * Get the last inode value, see if there's nothing to do.
383          */
384         ino = (xfs_ino_t)*lastinop;
385         lastino = ino;
386         dip = NULL;
387         agno = XFS_INO_TO_AGNO(mp, ino);
388         agino = XFS_INO_TO_AGINO(mp, ino);
389         if (agno >= mp->m_sb.sb_agcount ||
390             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
391                 *done = 1;
392                 *ubcountp = 0;
393                 return 0;
394         }
395         if (!ubcountp || *ubcountp <= 0) {
396                 return EINVAL;
397         }
398         ubcount = *ubcountp; /* statstruct's */
399         ubleft = ubcount * statstruct_size; /* bytes */
400         *ubcountp = ubelem = 0;
401         *done = 0;
402         fmterror = 0;
403         ubufp = ubuffer;
404         nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
405                 mp->m_sb.sb_inopblock :
406                 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
407         nimask = ~(nicluster - 1);
408         nbcluster = nicluster >> mp->m_sb.sb_inopblog;
409         irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4,
410                                    KM_SLEEP | KM_MAYFAIL | KM_LARGE);
411         nirbuf = irbsize / sizeof(*irbuf);
412
413         /*
414          * Loop over the allocation groups, starting from the last
415          * inode returned; 0 means start of the allocation group.
416          */
417         rval = 0;
418         while (XFS_BULKSTAT_UBLEFT(ubleft) && agno < mp->m_sb.sb_agcount) {
419                 cond_resched();
420                 bp = NULL;
421                 down_read(&mp->m_peraglock);
422                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
423                 up_read(&mp->m_peraglock);
424                 if (error) {
425                         /*
426                          * Skip this allocation group and go to the next one.
427                          */
428                         agno++;
429                         agino = 0;
430                         continue;
431                 }
432                 agi = XFS_BUF_TO_AGI(agbp);
433                 /*
434                  * Allocate and initialize a btree cursor for ialloc btree.
435                  */
436                 cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno);
437                 irbp = irbuf;
438                 irbufend = irbuf + nirbuf;
439                 end_of_ag = 0;
440                 /*
441                  * If we're returning in the middle of an allocation group,
442                  * we need to get the remainder of the chunk we're in.
443                  */
444                 if (agino > 0) {
445                         /*
446                          * Lookup the inode chunk that this inode lives in.
447                          */
448                         error = xfs_inobt_lookup_le(cur, agino, 0, 0, &tmp);
449                         if (!error &&   /* no I/O error */
450                             tmp &&      /* lookup succeeded */
451                                         /* got the record, should always work */
452                             !(error = xfs_inobt_get_rec(cur, &gino, &gcnt,
453                                     &gfree, &i)) &&
454                             i == 1 &&
455                                         /* this is the right chunk */
456                             agino < gino + XFS_INODES_PER_CHUNK &&
457                                         /* lastino was not last in chunk */
458                             (chunkidx = agino - gino + 1) <
459                                     XFS_INODES_PER_CHUNK &&
460                                         /* there are some left allocated */
461                             xfs_inobt_maskn(chunkidx,
462                                     XFS_INODES_PER_CHUNK - chunkidx) & ~gfree) {
463                                 /*
464                                  * Grab the chunk record.  Mark all the
465                                  * uninteresting inodes (because they're
466                                  * before our start point) free.
467                                  */
468                                 for (i = 0; i < chunkidx; i++) {
469                                         if (XFS_INOBT_MASK(i) & ~gfree)
470                                                 gcnt++;
471                                 }
472                                 gfree |= xfs_inobt_maskn(0, chunkidx);
473                                 irbp->ir_startino = gino;
474                                 irbp->ir_freecount = gcnt;
475                                 irbp->ir_free = gfree;
476                                 irbp++;
477                                 agino = gino + XFS_INODES_PER_CHUNK;
478                                 icount = XFS_INODES_PER_CHUNK - gcnt;
479                         } else {
480                                 /*
481                                  * If any of those tests failed, bump the
482                                  * inode number (just in case).
483                                  */
484                                 agino++;
485                                 icount = 0;
486                         }
487                         /*
488                          * In any case, increment to the next record.
489                          */
490                         if (!error)
491                                 error = xfs_btree_increment(cur, 0, &tmp);
492                 } else {
493                         /*
494                          * Start of ag.  Lookup the first inode chunk.
495                          */
496                         error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &tmp);
497                         icount = 0;
498                 }
499                 /*
500                  * Loop through inode btree records in this ag,
501                  * until we run out of inodes or space in the buffer.
502                  */
503                 while (irbp < irbufend && icount < ubcount) {
504                         /*
505                          * Loop as long as we're unable to read the
506                          * inode btree.
507                          */
508                         while (error) {
509                                 agino += XFS_INODES_PER_CHUNK;
510                                 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
511                                                 be32_to_cpu(agi->agi_length))
512                                         break;
513                                 error = xfs_inobt_lookup_ge(cur, agino, 0, 0,
514                                                             &tmp);
515                                 cond_resched();
516                         }
517                         /*
518                          * If ran off the end of the ag either with an error,
519                          * or the normal way, set end and stop collecting.
520                          */
521                         if (error ||
522                             (error = xfs_inobt_get_rec(cur, &gino, &gcnt,
523                                     &gfree, &i)) ||
524                             i == 0) {
525                                 end_of_ag = 1;
526                                 break;
527                         }
528                         /*
529                          * If this chunk has any allocated inodes, save it.
530                          * Also start read-ahead now for this chunk.
531                          */
532                         if (gcnt < XFS_INODES_PER_CHUNK) {
533                                 /*
534                                  * Loop over all clusters in the next chunk.
535                                  * Do a readahead if there are any allocated
536                                  * inodes in that cluster.
537                                  */
538                                 for (agbno = XFS_AGINO_TO_AGBNO(mp, gino),
539                                      chunkidx = 0;
540                                      chunkidx < XFS_INODES_PER_CHUNK;
541                                      chunkidx += nicluster,
542                                      agbno += nbcluster) {
543                                         if (xfs_inobt_maskn(chunkidx,
544                                                             nicluster) & ~gfree)
545                                                 xfs_btree_reada_bufs(mp, agno,
546                                                         agbno, nbcluster);
547                                 }
548                                 irbp->ir_startino = gino;
549                                 irbp->ir_freecount = gcnt;
550                                 irbp->ir_free = gfree;
551                                 irbp++;
552                                 icount += XFS_INODES_PER_CHUNK - gcnt;
553                         }
554                         /*
555                          * Set agino to after this chunk and bump the cursor.
556                          */
557                         agino = gino + XFS_INODES_PER_CHUNK;
558                         error = xfs_btree_increment(cur, 0, &tmp);
559                         cond_resched();
560                 }
561                 /*
562                  * Drop the btree buffers and the agi buffer.
563                  * We can't hold any of the locks these represent
564                  * when calling iget.
565                  */
566                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
567                 xfs_buf_relse(agbp);
568                 /*
569                  * Now format all the good inodes into the user's buffer.
570                  */
571                 irbufend = irbp;
572                 for (irbp = irbuf;
573                      irbp < irbufend && XFS_BULKSTAT_UBLEFT(ubleft); irbp++) {
574                         /*
575                          * Now process this chunk of inodes.
576                          */
577                         for (agino = irbp->ir_startino, chunkidx = clustidx = 0;
578                              XFS_BULKSTAT_UBLEFT(ubleft) &&
579                                 irbp->ir_freecount < XFS_INODES_PER_CHUNK;
580                              chunkidx++, clustidx++, agino++) {
581                                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
582                                 /*
583                                  * Recompute agbno if this is the
584                                  * first inode of the cluster.
585                                  *
586                                  * Careful with clustidx.   There can be
587                                  * multiple clusters per chunk, a single
588                                  * cluster per chunk or a cluster that has
589                                  * inodes represented from several different
590                                  * chunks (if blocksize is large).
591                                  *
592                                  * Because of this, the starting clustidx is
593                                  * initialized to zero in this loop but must
594                                  * later be reset after reading in the cluster
595                                  * buffer.
596                                  */
597                                 if ((chunkidx & (nicluster - 1)) == 0) {
598                                         agbno = XFS_AGINO_TO_AGBNO(mp,
599                                                         irbp->ir_startino) +
600                                                 ((chunkidx & nimask) >>
601                                                  mp->m_sb.sb_inopblog);
602
603                                         if (flags & (BULKSTAT_FG_QUICK |
604                                                      BULKSTAT_FG_INLINE)) {
605                                                 int offset;
606
607                                                 ino = XFS_AGINO_TO_INO(mp, agno,
608                                                                        agino);
609                                                 bno = XFS_AGB_TO_DADDR(mp, agno,
610                                                                        agbno);
611
612                                                 /*
613                                                  * Get the inode cluster buffer
614                                                  */
615                                                 if (bp)
616                                                         xfs_buf_relse(bp);
617
618                                                 error = xfs_inotobp(mp, NULL, ino, &dip,
619                                                                     &bp, &offset,
620                                                                     XFS_IGET_BULKSTAT);
621
622                                                 if (!error)
623                                                         clustidx = offset / mp->m_sb.sb_inodesize;
624                                                 if (XFS_TEST_ERROR(error != 0,
625                                                                    mp, XFS_ERRTAG_BULKSTAT_READ_CHUNK,
626                                                                    XFS_RANDOM_BULKSTAT_READ_CHUNK)) {
627                                                         bp = NULL;
628                                                         ubleft = 0;
629                                                         rval = error;
630                                                         break;
631                                                 }
632                                         }
633                                 }
634                                 ino = XFS_AGINO_TO_INO(mp, agno, agino);
635                                 bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
636                                 /*
637                                  * Skip if this inode is free.
638                                  */
639                                 if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free) {
640                                         lastino = ino;
641                                         continue;
642                                 }
643                                 /*
644                                  * Count used inodes as free so we can tell
645                                  * when the chunk is used up.
646                                  */
647                                 irbp->ir_freecount++;
648                                 if (!xfs_bulkstat_use_dinode(mp, flags, bp,
649                                                              clustidx, &dip)) {
650                                         lastino = ino;
651                                         continue;
652                                 }
653                                 /*
654                                  * If we need to do an iget, cannot hold bp.
655                                  * Drop it, until starting the next cluster.
656                                  */
657                                 if ((flags & BULKSTAT_FG_INLINE) && !dip) {
658                                         if (bp)
659                                                 xfs_buf_relse(bp);
660                                         bp = NULL;
661                                 }
662
663                                 /*
664                                  * Get the inode and fill in a single buffer.
665                                  * BULKSTAT_FG_QUICK uses dip to fill it in.
666                                  * BULKSTAT_FG_IGET uses igets.
667                                  * BULKSTAT_FG_INLINE uses dip if we have an
668                                  * inline attr fork, else igets.
669                                  * See: xfs_bulkstat_one & xfs_dm_bulkstat_one.
670                                  * This is also used to count inodes/blks, etc
671                                  * in xfs_qm_quotacheck.
672                                  */
673                                 ubused = statstruct_size;
674                                 error = formatter(mp, ino, ubufp,
675                                                 ubleft, private_data,
676                                                 bno, &ubused, dip, &fmterror);
677                                 if (fmterror == BULKSTAT_RV_NOTHING) {
678                                         if (error && error != ENOENT &&
679                                                 error != EINVAL) {
680                                                 ubleft = 0;
681                                                 rval = error;
682                                                 break;
683                                         }
684                                         lastino = ino;
685                                         continue;
686                                 }
687                                 if (fmterror == BULKSTAT_RV_GIVEUP) {
688                                         ubleft = 0;
689                                         ASSERT(error);
690                                         rval = error;
691                                         break;
692                                 }
693                                 if (ubufp)
694                                         ubufp += ubused;
695                                 ubleft -= ubused;
696                                 ubelem++;
697                                 lastino = ino;
698                         }
699
700                         cond_resched();
701                 }
702
703                 if (bp)
704                         xfs_buf_relse(bp);
705
706                 /*
707                  * Set up for the next loop iteration.
708                  */
709                 if (XFS_BULKSTAT_UBLEFT(ubleft)) {
710                         if (end_of_ag) {
711                                 agno++;
712                                 agino = 0;
713                         } else
714                                 agino = XFS_INO_TO_AGINO(mp, lastino);
715                 } else
716                         break;
717         }
718         /*
719          * Done, we're either out of filesystem or space to put the data.
720          */
721         kmem_free(irbuf);
722         *ubcountp = ubelem;
723         /*
724          * Found some inodes, return them now and return the error next time.
725          */
726         if (ubelem)
727                 rval = 0;
728         if (agno >= mp->m_sb.sb_agcount) {
729                 /*
730                  * If we ran out of filesystem, mark lastino as off
731                  * the end of the filesystem, so the next call
732                  * will return immediately.
733                  */
734                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
735                 *done = 1;
736         } else
737                 *lastinop = (xfs_ino_t)lastino;
738
739         return rval;
740 }
741
742 /*
743  * Return stat information in bulk (by-inode) for the filesystem.
744  * Special case for non-sequential one inode bulkstat.
745  */
746 int                                     /* error status */
747 xfs_bulkstat_single(
748         xfs_mount_t             *mp,    /* mount point for filesystem */
749         xfs_ino_t               *lastinop, /* inode to return */
750         char                    __user *buffer, /* buffer with inode stats */
751         int                     *done)  /* 1 if there are more stats to get */
752 {
753         int                     count;  /* count value for bulkstat call */
754         int                     error;  /* return value */
755         xfs_ino_t               ino;    /* filesystem inode number */
756         int                     res;    /* result from bs1 */
757
758         /*
759          * note that requesting valid inode numbers which are not allocated
760          * to inodes will most likely cause xfs_itobp to generate warning
761          * messages about bad magic numbers. This is ok. The fact that
762          * the inode isn't actually an inode is handled by the
763          * error check below. Done this way to make the usual case faster
764          * at the expense of the error case.
765          */
766
767         ino = (xfs_ino_t)*lastinop;
768         error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t),
769                                  NULL, 0, NULL, NULL, &res);
770         if (error) {
771                 /*
772                  * Special case way failed, do it the "long" way
773                  * to see if that works.
774                  */
775                 (*lastinop)--;
776                 count = 1;
777                 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
778                                 NULL, sizeof(xfs_bstat_t), buffer,
779                                 BULKSTAT_FG_IGET, done))
780                         return error;
781                 if (count == 0 || (xfs_ino_t)*lastinop != ino)
782                         return error == EFSCORRUPTED ?
783                                 XFS_ERROR(EINVAL) : error;
784                 else
785                         return 0;
786         }
787         *done = 0;
788         return 0;
789 }
790
791 int
792 xfs_inumbers_fmt(
793         void                    __user *ubuffer, /* buffer to write to */
794         const xfs_inogrp_t      *buffer,        /* buffer to read from */
795         long                    count,          /* # of elements to read */
796         long                    *written)       /* # of bytes written */
797 {
798         if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer)))
799                 return -EFAULT;
800         *written = count * sizeof(*buffer);
801         return 0;
802 }
803
804 /*
805  * Return inode number table for the filesystem.
806  */
807 int                                     /* error status */
808 xfs_inumbers(
809         xfs_mount_t     *mp,            /* mount point for filesystem */
810         xfs_ino_t       *lastino,       /* last inode returned */
811         int             *count,         /* size of buffer/count returned */
812         void            __user *ubuffer,/* buffer with inode descriptions */
813         inumbers_fmt_pf formatter)
814 {
815         xfs_buf_t       *agbp;
816         xfs_agino_t     agino;
817         xfs_agnumber_t  agno;
818         int             bcount;
819         xfs_inogrp_t    *buffer;
820         int             bufidx;
821         xfs_btree_cur_t *cur;
822         int             error;
823         __int32_t       gcnt;
824         xfs_inofree_t   gfree;
825         xfs_agino_t     gino;
826         int             i;
827         xfs_ino_t       ino;
828         int             left;
829         int             tmp;
830
831         ino = (xfs_ino_t)*lastino;
832         agno = XFS_INO_TO_AGNO(mp, ino);
833         agino = XFS_INO_TO_AGINO(mp, ino);
834         left = *count;
835         *count = 0;
836         bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)));
837         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
838         error = bufidx = 0;
839         cur = NULL;
840         agbp = NULL;
841         while (left > 0 && agno < mp->m_sb.sb_agcount) {
842                 if (agbp == NULL) {
843                         down_read(&mp->m_peraglock);
844                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
845                         up_read(&mp->m_peraglock);
846                         if (error) {
847                                 /*
848                                  * If we can't read the AGI of this ag,
849                                  * then just skip to the next one.
850                                  */
851                                 ASSERT(cur == NULL);
852                                 agbp = NULL;
853                                 agno++;
854                                 agino = 0;
855                                 continue;
856                         }
857                         cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno);
858                         error = xfs_inobt_lookup_ge(cur, agino, 0, 0, &tmp);
859                         if (error) {
860                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
861                                 cur = NULL;
862                                 xfs_buf_relse(agbp);
863                                 agbp = NULL;
864                                 /*
865                                  * Move up the last inode in the current
866                                  * chunk.  The lookup_ge will always get
867                                  * us the first inode in the next chunk.
868                                  */
869                                 agino += XFS_INODES_PER_CHUNK - 1;
870                                 continue;
871                         }
872                 }
873                 if ((error = xfs_inobt_get_rec(cur, &gino, &gcnt, &gfree,
874                         &i)) ||
875                     i == 0) {
876                         xfs_buf_relse(agbp);
877                         agbp = NULL;
878                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
879                         cur = NULL;
880                         agno++;
881                         agino = 0;
882                         continue;
883                 }
884                 agino = gino + XFS_INODES_PER_CHUNK - 1;
885                 buffer[bufidx].xi_startino = XFS_AGINO_TO_INO(mp, agno, gino);
886                 buffer[bufidx].xi_alloccount = XFS_INODES_PER_CHUNK - gcnt;
887                 buffer[bufidx].xi_allocmask = ~gfree;
888                 bufidx++;
889                 left--;
890                 if (bufidx == bcount) {
891                         long written;
892                         if (formatter(ubuffer, buffer, bufidx, &written)) {
893                                 error = XFS_ERROR(EFAULT);
894                                 break;
895                         }
896                         ubuffer += written;
897                         *count += bufidx;
898                         bufidx = 0;
899                 }
900                 if (left) {
901                         error = xfs_btree_increment(cur, 0, &tmp);
902                         if (error) {
903                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
904                                 cur = NULL;
905                                 xfs_buf_relse(agbp);
906                                 agbp = NULL;
907                                 /*
908                                  * The agino value has already been bumped.
909                                  * Just try to skip up to it.
910                                  */
911                                 agino += XFS_INODES_PER_CHUNK;
912                                 continue;
913                         }
914                 }
915         }
916         if (!error) {
917                 if (bufidx) {
918                         long written;
919                         if (formatter(ubuffer, buffer, bufidx, &written))
920                                 error = XFS_ERROR(EFAULT);
921                         else
922                                 *count += bufidx;
923                 }
924                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
925         }
926         kmem_free(buffer);
927         if (cur)
928                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
929                                            XFS_BTREE_NOERROR));
930         if (agbp)
931                 xfs_buf_relse(agbp);
932         return error;
933 }