Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
[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         bhv_vnode_t     *vp;
63         int             error;
64
65         error = xfs_iget(mp, NULL, ino,
66                          XFS_IGET_BULKSTAT, XFS_ILOCK_SHARED, &ip, bno);
67         if (error) {
68                 *stat = BULKSTAT_RV_NOTHING;
69                 return error;
70         }
71
72         ASSERT(ip != NULL);
73         ASSERT(ip->i_blkno != (xfs_daddr_t)0);
74
75         vp = XFS_ITOV(ip);
76         dic = &ip->i_d;
77
78         /* xfs_iget returns the following without needing
79          * further change.
80          */
81         buf->bs_nlink = dic->di_nlink;
82         buf->bs_projid = dic->di_projid;
83         buf->bs_ino = ino;
84         buf->bs_mode = dic->di_mode;
85         buf->bs_uid = dic->di_uid;
86         buf->bs_gid = dic->di_gid;
87         buf->bs_size = dic->di_size;
88         vn_atime_to_bstime(vp, &buf->bs_atime);
89         buf->bs_mtime.tv_sec = dic->di_mtime.t_sec;
90         buf->bs_mtime.tv_nsec = dic->di_mtime.t_nsec;
91         buf->bs_ctime.tv_sec = dic->di_ctime.t_sec;
92         buf->bs_ctime.tv_nsec = dic->di_ctime.t_nsec;
93         buf->bs_xflags = xfs_ip2xflags(ip);
94         buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
95         buf->bs_extents = dic->di_nextents;
96         buf->bs_gen = dic->di_gen;
97         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
98         buf->bs_dmevmask = dic->di_dmevmask;
99         buf->bs_dmstate = dic->di_dmstate;
100         buf->bs_aextents = dic->di_anextents;
101
102         switch (dic->di_format) {
103         case XFS_DINODE_FMT_DEV:
104                 buf->bs_rdev = ip->i_df.if_u2.if_rdev;
105                 buf->bs_blksize = BLKDEV_IOSIZE;
106                 buf->bs_blocks = 0;
107                 break;
108         case XFS_DINODE_FMT_LOCAL:
109         case XFS_DINODE_FMT_UUID:
110                 buf->bs_rdev = 0;
111                 buf->bs_blksize = mp->m_sb.sb_blocksize;
112                 buf->bs_blocks = 0;
113                 break;
114         case XFS_DINODE_FMT_EXTENTS:
115         case XFS_DINODE_FMT_BTREE:
116                 buf->bs_rdev = 0;
117                 buf->bs_blksize = mp->m_sb.sb_blocksize;
118                 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
119                 break;
120         }
121
122         xfs_iput(ip, XFS_ILOCK_SHARED);
123         return error;
124 }
125
126 STATIC void
127 xfs_bulkstat_one_dinode(
128         xfs_mount_t     *mp,            /* mount point for filesystem */
129         xfs_ino_t       ino,            /* inode number to get data for */
130         xfs_dinode_t    *dip,           /* dinode inode pointer */
131         xfs_bstat_t     *buf)           /* return buffer */
132 {
133         xfs_dinode_core_t *dic;         /* dinode core info pointer */
134
135         dic = &dip->di_core;
136
137         /*
138          * The inode format changed when we moved the link count and
139          * made it 32 bits long.  If this is an old format inode,
140          * convert it in memory to look like a new one.  If it gets
141          * flushed to disk we will convert back before flushing or
142          * logging it.  We zero out the new projid field and the old link
143          * count field.  We'll handle clearing the pad field (the remains
144          * of the old uuid field) when we actually convert the inode to
145          * the new format. We don't change the version number so that we
146          * can distinguish this from a real new format inode.
147          */
148         if (dic->di_version == XFS_DINODE_VERSION_1) {
149                 buf->bs_nlink = be16_to_cpu(dic->di_onlink);
150                 buf->bs_projid = 0;
151         } else {
152                 buf->bs_nlink = be32_to_cpu(dic->di_nlink);
153                 buf->bs_projid = be16_to_cpu(dic->di_projid);
154         }
155
156         buf->bs_ino = ino;
157         buf->bs_mode = be16_to_cpu(dic->di_mode);
158         buf->bs_uid = be32_to_cpu(dic->di_uid);
159         buf->bs_gid = be32_to_cpu(dic->di_gid);
160         buf->bs_size = be64_to_cpu(dic->di_size);
161         buf->bs_atime.tv_sec = be32_to_cpu(dic->di_atime.t_sec);
162         buf->bs_atime.tv_nsec = be32_to_cpu(dic->di_atime.t_nsec);
163         buf->bs_mtime.tv_sec = be32_to_cpu(dic->di_mtime.t_sec);
164         buf->bs_mtime.tv_nsec = be32_to_cpu(dic->di_mtime.t_nsec);
165         buf->bs_ctime.tv_sec = be32_to_cpu(dic->di_ctime.t_sec);
166         buf->bs_ctime.tv_nsec = be32_to_cpu(dic->di_ctime.t_nsec);
167         buf->bs_xflags = xfs_dic2xflags(dip);
168         buf->bs_extsize = be32_to_cpu(dic->di_extsize) << mp->m_sb.sb_blocklog;
169         buf->bs_extents = be32_to_cpu(dic->di_nextents);
170         buf->bs_gen = be32_to_cpu(dic->di_gen);
171         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
172         buf->bs_dmevmask = be32_to_cpu(dic->di_dmevmask);
173         buf->bs_dmstate = be16_to_cpu(dic->di_dmstate);
174         buf->bs_aextents = be16_to_cpu(dic->di_anextents);
175
176         switch (dic->di_format) {
177         case XFS_DINODE_FMT_DEV:
178                 buf->bs_rdev = be32_to_cpu(dip->di_u.di_dev);
179                 buf->bs_blksize = BLKDEV_IOSIZE;
180                 buf->bs_blocks = 0;
181                 break;
182         case XFS_DINODE_FMT_LOCAL:
183         case XFS_DINODE_FMT_UUID:
184                 buf->bs_rdev = 0;
185                 buf->bs_blksize = mp->m_sb.sb_blocksize;
186                 buf->bs_blocks = 0;
187                 break;
188         case XFS_DINODE_FMT_EXTENTS:
189         case XFS_DINODE_FMT_BTREE:
190                 buf->bs_rdev = 0;
191                 buf->bs_blksize = mp->m_sb.sb_blocksize;
192                 buf->bs_blocks = be64_to_cpu(dic->di_nblocks);
193                 break;
194         }
195 }
196
197 STATIC int
198 xfs_bulkstat_one_fmt(
199         void                    __user *ubuffer,
200         const xfs_bstat_t       *buffer)
201 {
202         if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
203                 return -EFAULT;
204         return sizeof(*buffer);
205 }
206
207 /*
208  * Return stat information for one inode.
209  * Return 0 if ok, else errno.
210  */
211 int                             /* error status */
212 xfs_bulkstat_one(
213         xfs_mount_t     *mp,            /* mount point for filesystem */
214         xfs_ino_t       ino,            /* inode number to get data for */
215         void            __user *buffer, /* buffer to place output in */
216         int             ubsize,         /* size of buffer */
217         void            *private_data,  /* my private data */
218         xfs_daddr_t     bno,            /* starting bno of inode cluster */
219         int             *ubused,        /* bytes used by me */
220         void            *dibuff,        /* on-disk inode buffer */
221         int             *stat)          /* BULKSTAT_RV_... */
222 {
223         xfs_bstat_t     *buf;           /* return buffer */
224         int             error = 0;      /* error value */
225         xfs_dinode_t    *dip;           /* dinode inode pointer */
226         bulkstat_one_fmt_pf formatter = private_data ? : xfs_bulkstat_one_fmt;
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         if (ubsize < sizeof(*buf))
234                 return XFS_ERROR(ENOMEM);
235
236         buf = kmem_alloc(sizeof(*buf), KM_SLEEP);
237
238         if (dip == NULL) {
239                 /* We're not being passed a pointer to a dinode.  This happens
240                  * if BULKSTAT_FG_IGET is selected.  Do the iget.
241                  */
242                 error = xfs_bulkstat_one_iget(mp, ino, bno, buf, stat);
243                 if (error)
244                         goto out_free;
245         } else {
246                 xfs_bulkstat_one_dinode(mp, ino, dip, buf);
247         }
248
249         error = formatter(buffer, buf);
250         if (error < 0)  {
251                 error = EFAULT;
252                 goto out_free;
253         }
254
255         *stat = BULKSTAT_RV_DIDONE;
256         if (ubused)
257                 *ubused = error;
258
259  out_free:
260         kmem_free(buf);
261         return error;
262 }
263
264 /*
265  * Test to see whether we can use the ondisk inode directly, based
266  * on the given bulkstat flags, filling in dipp accordingly.
267  * Returns zero if the inode is dodgey.
268  */
269 STATIC int
270 xfs_bulkstat_use_dinode(
271         xfs_mount_t     *mp,
272         int             flags,
273         xfs_buf_t       *bp,
274         int             clustidx,
275         xfs_dinode_t    **dipp)
276 {
277         xfs_dinode_t    *dip;
278         unsigned int    aformat;
279
280         *dipp = NULL;
281         if (!bp || (flags & BULKSTAT_FG_IGET))
282                 return 1;
283         dip = (xfs_dinode_t *)
284                         xfs_buf_offset(bp, clustidx << mp->m_sb.sb_inodelog);
285         /*
286          * Check the buffer containing the on-disk inode for di_mode == 0.
287          * This is to prevent xfs_bulkstat from picking up just reclaimed
288          * inodes that have their in-core state initialized but not flushed
289          * to disk yet. This is a temporary hack that would require a proper
290          * fix in the future.
291          */
292         if (be16_to_cpu(dip->di_core.di_magic) != XFS_DINODE_MAGIC ||
293             !XFS_DINODE_GOOD_VERSION(dip->di_core.di_version) ||
294             !dip->di_core.di_mode)
295                 return 0;
296         if (flags & BULKSTAT_FG_QUICK) {
297                 *dipp = dip;
298                 return 1;
299         }
300         /* BULKSTAT_FG_INLINE: if attr fork is local, or not there, use it */
301         aformat = dip->di_core.di_aformat;
302         if ((XFS_DFORK_Q(dip) == 0) ||
303             (aformat == XFS_DINODE_FMT_LOCAL) ||
304             (aformat == XFS_DINODE_FMT_EXTENTS && !dip->di_core.di_anextents)) {
305                 *dipp = dip;
306                 return 1;
307         }
308         return 1;
309 }
310
311 #define XFS_BULKSTAT_UBLEFT(ubleft)     ((ubleft) >= statstruct_size)
312
313 /*
314  * Return stat information in bulk (by-inode) for the filesystem.
315  */
316 int                                     /* error status */
317 xfs_bulkstat(
318         xfs_mount_t             *mp,    /* mount point for filesystem */
319         xfs_ino_t               *lastinop, /* last inode returned */
320         int                     *ubcountp, /* size of buffer/count returned */
321         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
322         void                    *private_data,/* private data for formatter */
323         size_t                  statstruct_size, /* sizeof struct filling */
324         char                    __user *ubuffer, /* buffer with inode stats */
325         int                     flags,  /* defined in xfs_itable.h */
326         int                     *done)  /* 1 if there are more stats to get */
327 {
328         xfs_agblock_t           agbno=0;/* allocation group block number */
329         xfs_buf_t               *agbp;  /* agi header buffer */
330         xfs_agi_t               *agi;   /* agi header data */
331         xfs_agino_t             agino;  /* inode # in allocation group */
332         xfs_agnumber_t          agno;   /* allocation group number */
333         xfs_daddr_t             bno;    /* inode cluster start daddr */
334         int                     chunkidx; /* current index into inode chunk */
335         int                     clustidx; /* current index into inode cluster */
336         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
337         int                     end_of_ag; /* set if we've seen the ag end */
338         int                     error;  /* error code */
339         int                     fmterror;/* bulkstat formatter result */
340         __int32_t               gcnt;   /* current btree rec's count */
341         xfs_inofree_t           gfree;  /* current btree rec's free mask */
342         xfs_agino_t             gino;   /* current btree rec's start inode */
343         int                     i;      /* loop index */
344         int                     icount; /* count of inodes good in irbuf */
345         size_t                  irbsize; /* size of irec buffer in bytes */
346         xfs_ino_t               ino;    /* inode number (filesystem) */
347         xfs_inobt_rec_incore_t  *irbp;  /* current irec buffer pointer */
348         xfs_inobt_rec_incore_t  *irbuf; /* start of irec buffer */
349         xfs_inobt_rec_incore_t  *irbufend; /* end of good irec buffer entries */
350         xfs_ino_t               lastino; /* last inode number returned */
351         int                     nbcluster; /* # of blocks in a cluster */
352         int                     nicluster; /* # of inodes in a cluster */
353         int                     nimask; /* mask for inode clusters */
354         int                     nirbuf; /* size of irbuf */
355         int                     rval;   /* return value error code */
356         int                     tmp;    /* result value from btree calls */
357         int                     ubcount; /* size of user's buffer */
358         int                     ubleft; /* bytes left in user's buffer */
359         char                    __user *ubufp;  /* pointer into user's buffer */
360         int                     ubelem; /* spaces used in user's buffer */
361         int                     ubused; /* bytes used by formatter */
362         xfs_buf_t               *bp;    /* ptr to on-disk inode cluster buf */
363         xfs_dinode_t            *dip;   /* ptr into bp for specific inode */
364         xfs_inode_t             *ip;    /* ptr to in-core inode struct */
365
366         /*
367          * Get the last inode value, see if there's nothing to do.
368          */
369         ino = (xfs_ino_t)*lastinop;
370         lastino = ino;
371         dip = NULL;
372         agno = XFS_INO_TO_AGNO(mp, ino);
373         agino = XFS_INO_TO_AGINO(mp, ino);
374         if (agno >= mp->m_sb.sb_agcount ||
375             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
376                 *done = 1;
377                 *ubcountp = 0;
378                 return 0;
379         }
380         if (!ubcountp || *ubcountp <= 0) {
381                 return EINVAL;
382         }
383         ubcount = *ubcountp; /* statstruct's */
384         ubleft = ubcount * statstruct_size; /* bytes */
385         *ubcountp = ubelem = 0;
386         *done = 0;
387         fmterror = 0;
388         ubufp = ubuffer;
389         nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
390                 mp->m_sb.sb_inopblock :
391                 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
392         nimask = ~(nicluster - 1);
393         nbcluster = nicluster >> mp->m_sb.sb_inopblog;
394         irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4,
395                                    KM_SLEEP | KM_MAYFAIL | KM_LARGE);
396         nirbuf = irbsize / sizeof(*irbuf);
397
398         /*
399          * Loop over the allocation groups, starting from the last
400          * inode returned; 0 means start of the allocation group.
401          */
402         rval = 0;
403         while (XFS_BULKSTAT_UBLEFT(ubleft) && agno < mp->m_sb.sb_agcount) {
404                 cond_resched();
405                 bp = NULL;
406                 down_read(&mp->m_peraglock);
407                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
408                 up_read(&mp->m_peraglock);
409                 if (error) {
410                         /*
411                          * Skip this allocation group and go to the next one.
412                          */
413                         agno++;
414                         agino = 0;
415                         continue;
416                 }
417                 agi = XFS_BUF_TO_AGI(agbp);
418                 /*
419                  * Allocate and initialize a btree cursor for ialloc btree.
420                  */
421                 cur = xfs_btree_init_cursor(mp, NULL, agbp, agno, XFS_BTNUM_INO,
422                                                 (xfs_inode_t *)0, 0);
423                 irbp = irbuf;
424                 irbufend = irbuf + nirbuf;
425                 end_of_ag = 0;
426                 /*
427                  * If we're returning in the middle of an allocation group,
428                  * we need to get the remainder of the chunk we're in.
429                  */
430                 if (agino > 0) {
431                         /*
432                          * Lookup the inode chunk that this inode lives in.
433                          */
434                         error = xfs_inobt_lookup_le(cur, agino, 0, 0, &tmp);
435                         if (!error &&   /* no I/O error */
436                             tmp &&      /* lookup succeeded */
437                                         /* got the record, should always work */
438                             !(error = xfs_inobt_get_rec(cur, &gino, &gcnt,
439                                     &gfree, &i)) &&
440                             i == 1 &&
441                                         /* this is the right chunk */
442                             agino < gino + XFS_INODES_PER_CHUNK &&
443                                         /* lastino was not last in chunk */
444                             (chunkidx = agino - gino + 1) <
445                                     XFS_INODES_PER_CHUNK &&
446                                         /* there are some left allocated */
447                             XFS_INOBT_MASKN(chunkidx,
448                                     XFS_INODES_PER_CHUNK - chunkidx) & ~gfree) {
449                                 /*
450                                  * Grab the chunk record.  Mark all the
451                                  * uninteresting inodes (because they're
452                                  * before our start point) free.
453                                  */
454                                 for (i = 0; i < chunkidx; i++) {
455                                         if (XFS_INOBT_MASK(i) & ~gfree)
456                                                 gcnt++;
457                                 }
458                                 gfree |= XFS_INOBT_MASKN(0, chunkidx);
459                                 irbp->ir_startino = gino;
460                                 irbp->ir_freecount = gcnt;
461                                 irbp->ir_free = gfree;
462                                 irbp++;
463                                 agino = gino + XFS_INODES_PER_CHUNK;
464                                 icount = XFS_INODES_PER_CHUNK - gcnt;
465                         } else {
466                                 /*
467                                  * If any of those tests failed, bump the
468                                  * inode number (just in case).
469                                  */
470                                 agino++;
471                                 icount = 0;
472                         }
473                         /*
474                          * In any case, increment to the next record.
475                          */
476                         if (!error)
477                                 error = xfs_inobt_increment(cur, 0, &tmp);
478                 } else {
479                         /*
480                          * Start of ag.  Lookup the first inode chunk.
481                          */
482                         error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &tmp);
483                         icount = 0;
484                 }
485                 /*
486                  * Loop through inode btree records in this ag,
487                  * until we run out of inodes or space in the buffer.
488                  */
489                 while (irbp < irbufend && icount < ubcount) {
490                         /*
491                          * Loop as long as we're unable to read the
492                          * inode btree.
493                          */
494                         while (error) {
495                                 agino += XFS_INODES_PER_CHUNK;
496                                 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
497                                                 be32_to_cpu(agi->agi_length))
498                                         break;
499                                 error = xfs_inobt_lookup_ge(cur, agino, 0, 0,
500                                                             &tmp);
501                                 cond_resched();
502                         }
503                         /*
504                          * If ran off the end of the ag either with an error,
505                          * or the normal way, set end and stop collecting.
506                          */
507                         if (error ||
508                             (error = xfs_inobt_get_rec(cur, &gino, &gcnt,
509                                     &gfree, &i)) ||
510                             i == 0) {
511                                 end_of_ag = 1;
512                                 break;
513                         }
514                         /*
515                          * If this chunk has any allocated inodes, save it.
516                          * Also start read-ahead now for this chunk.
517                          */
518                         if (gcnt < XFS_INODES_PER_CHUNK) {
519                                 /*
520                                  * Loop over all clusters in the next chunk.
521                                  * Do a readahead if there are any allocated
522                                  * inodes in that cluster.
523                                  */
524                                 for (agbno = XFS_AGINO_TO_AGBNO(mp, gino),
525                                      chunkidx = 0;
526                                      chunkidx < XFS_INODES_PER_CHUNK;
527                                      chunkidx += nicluster,
528                                      agbno += nbcluster) {
529                                         if (XFS_INOBT_MASKN(chunkidx,
530                                                             nicluster) & ~gfree)
531                                                 xfs_btree_reada_bufs(mp, agno,
532                                                         agbno, nbcluster);
533                                 }
534                                 irbp->ir_startino = gino;
535                                 irbp->ir_freecount = gcnt;
536                                 irbp->ir_free = gfree;
537                                 irbp++;
538                                 icount += XFS_INODES_PER_CHUNK - gcnt;
539                         }
540                         /*
541                          * Set agino to after this chunk and bump the cursor.
542                          */
543                         agino = gino + XFS_INODES_PER_CHUNK;
544                         error = xfs_inobt_increment(cur, 0, &tmp);
545                         cond_resched();
546                 }
547                 /*
548                  * Drop the btree buffers and the agi buffer.
549                  * We can't hold any of the locks these represent
550                  * when calling iget.
551                  */
552                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
553                 xfs_buf_relse(agbp);
554                 /*
555                  * Now format all the good inodes into the user's buffer.
556                  */
557                 irbufend = irbp;
558                 for (irbp = irbuf;
559                      irbp < irbufend && XFS_BULKSTAT_UBLEFT(ubleft); irbp++) {
560                         /*
561                          * Now process this chunk of inodes.
562                          */
563                         for (agino = irbp->ir_startino, chunkidx = clustidx = 0;
564                              XFS_BULKSTAT_UBLEFT(ubleft) &&
565                                 irbp->ir_freecount < XFS_INODES_PER_CHUNK;
566                              chunkidx++, clustidx++, agino++) {
567                                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
568                                 /*
569                                  * Recompute agbno if this is the
570                                  * first inode of the cluster.
571                                  *
572                                  * Careful with clustidx.   There can be
573                                  * multple clusters per chunk, a single
574                                  * cluster per chunk or a cluster that has
575                                  * inodes represented from several different
576                                  * chunks (if blocksize is large).
577                                  *
578                                  * Because of this, the starting clustidx is
579                                  * initialized to zero in this loop but must
580                                  * later be reset after reading in the cluster
581                                  * buffer.
582                                  */
583                                 if ((chunkidx & (nicluster - 1)) == 0) {
584                                         agbno = XFS_AGINO_TO_AGBNO(mp,
585                                                         irbp->ir_startino) +
586                                                 ((chunkidx & nimask) >>
587                                                  mp->m_sb.sb_inopblog);
588
589                                         if (flags & (BULKSTAT_FG_QUICK |
590                                                      BULKSTAT_FG_INLINE)) {
591                                                 ino = XFS_AGINO_TO_INO(mp, agno,
592                                                                        agino);
593                                                 bno = XFS_AGB_TO_DADDR(mp, agno,
594                                                                        agbno);
595
596                                                 /*
597                                                  * Get the inode cluster buffer
598                                                  */
599                                                 ASSERT(xfs_inode_zone != NULL);
600                                                 ip = kmem_zone_zalloc(xfs_inode_zone,
601                                                                       KM_SLEEP);
602                                                 ip->i_ino = ino;
603                                                 ip->i_mount = mp;
604                                                 spin_lock_init(&ip->i_flags_lock);
605                                                 if (bp)
606                                                         xfs_buf_relse(bp);
607                                                 error = xfs_itobp(mp, NULL, ip,
608                                                                 &dip, &bp, bno,
609                                                                 XFS_IMAP_BULKSTAT,
610                                                                 XFS_BUF_LOCK);
611                                                 if (!error)
612                                                         clustidx = ip->i_boffset / mp->m_sb.sb_inodesize;
613                                                 kmem_zone_free(xfs_inode_zone, ip);
614                                                 if (XFS_TEST_ERROR(error != 0,
615                                                                    mp, XFS_ERRTAG_BULKSTAT_READ_CHUNK,
616                                                                    XFS_RANDOM_BULKSTAT_READ_CHUNK)) {
617                                                         bp = NULL;
618                                                         ubleft = 0;
619                                                         rval = error;
620                                                         break;
621                                                 }
622                                         }
623                                 }
624                                 ino = XFS_AGINO_TO_INO(mp, agno, agino);
625                                 bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
626                                 /*
627                                  * Skip if this inode is free.
628                                  */
629                                 if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free) {
630                                         lastino = ino;
631                                         continue;
632                                 }
633                                 /*
634                                  * Count used inodes as free so we can tell
635                                  * when the chunk is used up.
636                                  */
637                                 irbp->ir_freecount++;
638                                 if (!xfs_bulkstat_use_dinode(mp, flags, bp,
639                                                              clustidx, &dip)) {
640                                         lastino = ino;
641                                         continue;
642                                 }
643                                 /*
644                                  * If we need to do an iget, cannot hold bp.
645                                  * Drop it, until starting the next cluster.
646                                  */
647                                 if ((flags & BULKSTAT_FG_INLINE) && !dip) {
648                                         if (bp)
649                                                 xfs_buf_relse(bp);
650                                         bp = NULL;
651                                 }
652
653                                 /*
654                                  * Get the inode and fill in a single buffer.
655                                  * BULKSTAT_FG_QUICK uses dip to fill it in.
656                                  * BULKSTAT_FG_IGET uses igets.
657                                  * BULKSTAT_FG_INLINE uses dip if we have an
658                                  * inline attr fork, else igets.
659                                  * See: xfs_bulkstat_one & xfs_dm_bulkstat_one.
660                                  * This is also used to count inodes/blks, etc
661                                  * in xfs_qm_quotacheck.
662                                  */
663                                 ubused = statstruct_size;
664                                 error = formatter(mp, ino, ubufp,
665                                                 ubleft, private_data,
666                                                 bno, &ubused, dip, &fmterror);
667                                 if (fmterror == BULKSTAT_RV_NOTHING) {
668                                         if (error && error != ENOENT &&
669                                                 error != EINVAL) {
670                                                 ubleft = 0;
671                                                 rval = error;
672                                                 break;
673                                         }
674                                         lastino = ino;
675                                         continue;
676                                 }
677                                 if (fmterror == BULKSTAT_RV_GIVEUP) {
678                                         ubleft = 0;
679                                         ASSERT(error);
680                                         rval = error;
681                                         break;
682                                 }
683                                 if (ubufp)
684                                         ubufp += ubused;
685                                 ubleft -= ubused;
686                                 ubelem++;
687                                 lastino = ino;
688                         }
689
690                         cond_resched();
691                 }
692
693                 if (bp)
694                         xfs_buf_relse(bp);
695
696                 /*
697                  * Set up for the next loop iteration.
698                  */
699                 if (XFS_BULKSTAT_UBLEFT(ubleft)) {
700                         if (end_of_ag) {
701                                 agno++;
702                                 agino = 0;
703                         } else
704                                 agino = XFS_INO_TO_AGINO(mp, lastino);
705                 } else
706                         break;
707         }
708         /*
709          * Done, we're either out of filesystem or space to put the data.
710          */
711         kmem_free(irbuf);
712         *ubcountp = ubelem;
713         /*
714          * Found some inodes, return them now and return the error next time.
715          */
716         if (ubelem)
717                 rval = 0;
718         if (agno >= mp->m_sb.sb_agcount) {
719                 /*
720                  * If we ran out of filesystem, mark lastino as off
721                  * the end of the filesystem, so the next call
722                  * will return immediately.
723                  */
724                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
725                 *done = 1;
726         } else
727                 *lastinop = (xfs_ino_t)lastino;
728
729         return rval;
730 }
731
732 /*
733  * Return stat information in bulk (by-inode) for the filesystem.
734  * Special case for non-sequential one inode bulkstat.
735  */
736 int                                     /* error status */
737 xfs_bulkstat_single(
738         xfs_mount_t             *mp,    /* mount point for filesystem */
739         xfs_ino_t               *lastinop, /* inode to return */
740         char                    __user *buffer, /* buffer with inode stats */
741         int                     *done)  /* 1 if there are more stats to get */
742 {
743         int                     count;  /* count value for bulkstat call */
744         int                     error;  /* return value */
745         xfs_ino_t               ino;    /* filesystem inode number */
746         int                     res;    /* result from bs1 */
747
748         /*
749          * note that requesting valid inode numbers which are not allocated
750          * to inodes will most likely cause xfs_itobp to generate warning
751          * messages about bad magic numbers. This is ok. The fact that
752          * the inode isn't actually an inode is handled by the
753          * error check below. Done this way to make the usual case faster
754          * at the expense of the error case.
755          */
756
757         ino = (xfs_ino_t)*lastinop;
758         error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t),
759                                  NULL, 0, NULL, NULL, &res);
760         if (error) {
761                 /*
762                  * Special case way failed, do it the "long" way
763                  * to see if that works.
764                  */
765                 (*lastinop)--;
766                 count = 1;
767                 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
768                                 NULL, sizeof(xfs_bstat_t), buffer,
769                                 BULKSTAT_FG_IGET, done))
770                         return error;
771                 if (count == 0 || (xfs_ino_t)*lastinop != ino)
772                         return error == EFSCORRUPTED ?
773                                 XFS_ERROR(EINVAL) : error;
774                 else
775                         return 0;
776         }
777         *done = 0;
778         return 0;
779 }
780
781 int
782 xfs_inumbers_fmt(
783         void                    __user *ubuffer, /* buffer to write to */
784         const xfs_inogrp_t      *buffer,        /* buffer to read from */
785         long                    count,          /* # of elements to read */
786         long                    *written)       /* # of bytes written */
787 {
788         if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer)))
789                 return -EFAULT;
790         *written = count * sizeof(*buffer);
791         return 0;
792 }
793
794 /*
795  * Return inode number table for the filesystem.
796  */
797 int                                     /* error status */
798 xfs_inumbers(
799         xfs_mount_t     *mp,            /* mount point for filesystem */
800         xfs_ino_t       *lastino,       /* last inode returned */
801         int             *count,         /* size of buffer/count returned */
802         void            __user *ubuffer,/* buffer with inode descriptions */
803         inumbers_fmt_pf formatter)
804 {
805         xfs_buf_t       *agbp;
806         xfs_agino_t     agino;
807         xfs_agnumber_t  agno;
808         int             bcount;
809         xfs_inogrp_t    *buffer;
810         int             bufidx;
811         xfs_btree_cur_t *cur;
812         int             error;
813         __int32_t       gcnt;
814         xfs_inofree_t   gfree;
815         xfs_agino_t     gino;
816         int             i;
817         xfs_ino_t       ino;
818         int             left;
819         int             tmp;
820
821         ino = (xfs_ino_t)*lastino;
822         agno = XFS_INO_TO_AGNO(mp, ino);
823         agino = XFS_INO_TO_AGINO(mp, ino);
824         left = *count;
825         *count = 0;
826         bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)));
827         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
828         error = bufidx = 0;
829         cur = NULL;
830         agbp = NULL;
831         while (left > 0 && agno < mp->m_sb.sb_agcount) {
832                 if (agbp == NULL) {
833                         down_read(&mp->m_peraglock);
834                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
835                         up_read(&mp->m_peraglock);
836                         if (error) {
837                                 /*
838                                  * If we can't read the AGI of this ag,
839                                  * then just skip to the next one.
840                                  */
841                                 ASSERT(cur == NULL);
842                                 agbp = NULL;
843                                 agno++;
844                                 agino = 0;
845                                 continue;
846                         }
847                         cur = xfs_btree_init_cursor(mp, NULL, agbp, agno,
848                                 XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
849                         error = xfs_inobt_lookup_ge(cur, agino, 0, 0, &tmp);
850                         if (error) {
851                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
852                                 cur = NULL;
853                                 xfs_buf_relse(agbp);
854                                 agbp = NULL;
855                                 /*
856                                  * Move up the last inode in the current
857                                  * chunk.  The lookup_ge will always get
858                                  * us the first inode in the next chunk.
859                                  */
860                                 agino += XFS_INODES_PER_CHUNK - 1;
861                                 continue;
862                         }
863                 }
864                 if ((error = xfs_inobt_get_rec(cur, &gino, &gcnt, &gfree,
865                         &i)) ||
866                     i == 0) {
867                         xfs_buf_relse(agbp);
868                         agbp = NULL;
869                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
870                         cur = NULL;
871                         agno++;
872                         agino = 0;
873                         continue;
874                 }
875                 agino = gino + XFS_INODES_PER_CHUNK - 1;
876                 buffer[bufidx].xi_startino = XFS_AGINO_TO_INO(mp, agno, gino);
877                 buffer[bufidx].xi_alloccount = XFS_INODES_PER_CHUNK - gcnt;
878                 buffer[bufidx].xi_allocmask = ~gfree;
879                 bufidx++;
880                 left--;
881                 if (bufidx == bcount) {
882                         long written;
883                         if (formatter(ubuffer, buffer, bufidx, &written)) {
884                                 error = XFS_ERROR(EFAULT);
885                                 break;
886                         }
887                         ubuffer += written;
888                         *count += bufidx;
889                         bufidx = 0;
890                 }
891                 if (left) {
892                         error = xfs_inobt_increment(cur, 0, &tmp);
893                         if (error) {
894                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
895                                 cur = NULL;
896                                 xfs_buf_relse(agbp);
897                                 agbp = NULL;
898                                 /*
899                                  * The agino value has already been bumped.
900                                  * Just try to skip up to it.
901                                  */
902                                 agino += XFS_INODES_PER_CHUNK;
903                                 continue;
904                         }
905                 }
906         }
907         if (!error) {
908                 if (bufidx) {
909                         long written;
910                         if (formatter(ubuffer, buffer, bufidx, &written))
911                                 error = XFS_ERROR(EFAULT);
912                         else
913                                 *count += bufidx;
914                 }
915                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
916         }
917         kmem_free(buffer);
918         if (cur)
919                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
920                                            XFS_BTREE_NOERROR));
921         if (agbp)
922                 xfs_buf_relse(agbp);
923         return error;
924 }