ieee1394: replace a GFP_ATOMIC by GFP_KERNEL allocation
[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_blkno != (xfs_daddr_t)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    *dip,           /* dinode inode pointer */
129         xfs_bstat_t     *buf)           /* return buffer */
130 {
131         xfs_dinode_core_t *dic;         /* dinode core info pointer */
132
133         dic = &dip->di_core;
134
135         /*
136          * The inode format changed when we moved the link count and
137          * made it 32 bits long.  If this is an old format inode,
138          * convert it in memory to look like a new one.  If it gets
139          * flushed to disk we will convert back before flushing or
140          * logging it.  We zero out the new projid field and the old link
141          * count field.  We'll handle clearing the pad field (the remains
142          * of the old uuid field) when we actually convert the inode to
143          * the new format. We don't change the version number so that we
144          * can distinguish this from a real new format inode.
145          */
146         if (dic->di_version == XFS_DINODE_VERSION_1) {
147                 buf->bs_nlink = be16_to_cpu(dic->di_onlink);
148                 buf->bs_projid = 0;
149         } else {
150                 buf->bs_nlink = be32_to_cpu(dic->di_nlink);
151                 buf->bs_projid = be16_to_cpu(dic->di_projid);
152         }
153
154         buf->bs_ino = ino;
155         buf->bs_mode = be16_to_cpu(dic->di_mode);
156         buf->bs_uid = be32_to_cpu(dic->di_uid);
157         buf->bs_gid = be32_to_cpu(dic->di_gid);
158         buf->bs_size = be64_to_cpu(dic->di_size);
159         buf->bs_atime.tv_sec = be32_to_cpu(dic->di_atime.t_sec);
160         buf->bs_atime.tv_nsec = be32_to_cpu(dic->di_atime.t_nsec);
161         buf->bs_mtime.tv_sec = be32_to_cpu(dic->di_mtime.t_sec);
162         buf->bs_mtime.tv_nsec = be32_to_cpu(dic->di_mtime.t_nsec);
163         buf->bs_ctime.tv_sec = be32_to_cpu(dic->di_ctime.t_sec);
164         buf->bs_ctime.tv_nsec = be32_to_cpu(dic->di_ctime.t_nsec);
165         buf->bs_xflags = xfs_dic2xflags(dip);
166         buf->bs_extsize = be32_to_cpu(dic->di_extsize) << mp->m_sb.sb_blocklog;
167         buf->bs_extents = be32_to_cpu(dic->di_nextents);
168         buf->bs_gen = be32_to_cpu(dic->di_gen);
169         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
170         buf->bs_dmevmask = be32_to_cpu(dic->di_dmevmask);
171         buf->bs_dmstate = be16_to_cpu(dic->di_dmstate);
172         buf->bs_aextents = be16_to_cpu(dic->di_anextents);
173
174         switch (dic->di_format) {
175         case XFS_DINODE_FMT_DEV:
176                 buf->bs_rdev = be32_to_cpu(dip->di_u.di_dev);
177                 buf->bs_blksize = BLKDEV_IOSIZE;
178                 buf->bs_blocks = 0;
179                 break;
180         case XFS_DINODE_FMT_LOCAL:
181         case XFS_DINODE_FMT_UUID:
182                 buf->bs_rdev = 0;
183                 buf->bs_blksize = mp->m_sb.sb_blocksize;
184                 buf->bs_blocks = 0;
185                 break;
186         case XFS_DINODE_FMT_EXTENTS:
187         case XFS_DINODE_FMT_BTREE:
188                 buf->bs_rdev = 0;
189                 buf->bs_blksize = mp->m_sb.sb_blocksize;
190                 buf->bs_blocks = be64_to_cpu(dic->di_nblocks);
191                 break;
192         }
193 }
194
195 STATIC int
196 xfs_bulkstat_one_fmt(
197         void                    __user *ubuffer,
198         const xfs_bstat_t       *buffer)
199 {
200         if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
201                 return -EFAULT;
202         return sizeof(*buffer);
203 }
204
205 /*
206  * Return stat information for one inode.
207  * Return 0 if ok, else errno.
208  */
209 int                             /* error status */
210 xfs_bulkstat_one(
211         xfs_mount_t     *mp,            /* mount point for filesystem */
212         xfs_ino_t       ino,            /* inode number to get data for */
213         void            __user *buffer, /* buffer to place output in */
214         int             ubsize,         /* size of buffer */
215         void            *private_data,  /* my private data */
216         xfs_daddr_t     bno,            /* starting bno of inode cluster */
217         int             *ubused,        /* bytes used by me */
218         void            *dibuff,        /* on-disk inode buffer */
219         int             *stat)          /* BULKSTAT_RV_... */
220 {
221         xfs_bstat_t     *buf;           /* return buffer */
222         int             error = 0;      /* error value */
223         xfs_dinode_t    *dip;           /* dinode inode pointer */
224         bulkstat_one_fmt_pf formatter = private_data ? : xfs_bulkstat_one_fmt;
225
226         dip = (xfs_dinode_t *)dibuff;
227         *stat = BULKSTAT_RV_NOTHING;
228
229         if (!buffer || xfs_internal_inum(mp, ino))
230                 return XFS_ERROR(EINVAL);
231         if (ubsize < sizeof(*buf))
232                 return XFS_ERROR(ENOMEM);
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, buf);
248         if (error < 0)  {
249                 error = EFAULT;
250                 goto out_free;
251         }
252
253         *stat = BULKSTAT_RV_DIDONE;
254         if (ubused)
255                 *ubused = error;
256
257  out_free:
258         kmem_free(buf);
259         return error;
260 }
261
262 /*
263  * Test to see whether we can use the ondisk inode directly, based
264  * on the given bulkstat flags, filling in dipp accordingly.
265  * Returns zero if the inode is dodgey.
266  */
267 STATIC int
268 xfs_bulkstat_use_dinode(
269         xfs_mount_t     *mp,
270         int             flags,
271         xfs_buf_t       *bp,
272         int             clustidx,
273         xfs_dinode_t    **dipp)
274 {
275         xfs_dinode_t    *dip;
276         unsigned int    aformat;
277
278         *dipp = NULL;
279         if (!bp || (flags & BULKSTAT_FG_IGET))
280                 return 1;
281         dip = (xfs_dinode_t *)
282                         xfs_buf_offset(bp, clustidx << mp->m_sb.sb_inodelog);
283         /*
284          * Check the buffer containing the on-disk inode for di_mode == 0.
285          * This is to prevent xfs_bulkstat from picking up just reclaimed
286          * inodes that have their in-core state initialized but not flushed
287          * to disk yet. This is a temporary hack that would require a proper
288          * fix in the future.
289          */
290         if (be16_to_cpu(dip->di_core.di_magic) != XFS_DINODE_MAGIC ||
291             !XFS_DINODE_GOOD_VERSION(dip->di_core.di_version) ||
292             !dip->di_core.di_mode)
293                 return 0;
294         if (flags & BULKSTAT_FG_QUICK) {
295                 *dipp = dip;
296                 return 1;
297         }
298         /* BULKSTAT_FG_INLINE: if attr fork is local, or not there, use it */
299         aformat = dip->di_core.di_aformat;
300         if ((XFS_DFORK_Q(dip) == 0) ||
301             (aformat == XFS_DINODE_FMT_LOCAL) ||
302             (aformat == XFS_DINODE_FMT_EXTENTS && !dip->di_core.di_anextents)) {
303                 *dipp = dip;
304                 return 1;
305         }
306         return 1;
307 }
308
309 #define XFS_BULKSTAT_UBLEFT(ubleft)     ((ubleft) >= statstruct_size)
310
311 /*
312  * Return stat information in bulk (by-inode) for the filesystem.
313  */
314 int                                     /* error status */
315 xfs_bulkstat(
316         xfs_mount_t             *mp,    /* mount point for filesystem */
317         xfs_ino_t               *lastinop, /* last inode returned */
318         int                     *ubcountp, /* size of buffer/count returned */
319         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
320         void                    *private_data,/* private data for formatter */
321         size_t                  statstruct_size, /* sizeof struct filling */
322         char                    __user *ubuffer, /* buffer with inode stats */
323         int                     flags,  /* defined in xfs_itable.h */
324         int                     *done)  /* 1 if there are more stats to get */
325 {
326         xfs_agblock_t           agbno=0;/* allocation group block number */
327         xfs_buf_t               *agbp;  /* agi header buffer */
328         xfs_agi_t               *agi;   /* agi header data */
329         xfs_agino_t             agino;  /* inode # in allocation group */
330         xfs_agnumber_t          agno;   /* allocation group number */
331         xfs_daddr_t             bno;    /* inode cluster start daddr */
332         int                     chunkidx; /* current index into inode chunk */
333         int                     clustidx; /* current index into inode cluster */
334         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
335         int                     end_of_ag; /* set if we've seen the ag end */
336         int                     error;  /* error code */
337         int                     fmterror;/* bulkstat formatter result */
338         __int32_t               gcnt;   /* current btree rec's count */
339         xfs_inofree_t           gfree;  /* current btree rec's free mask */
340         xfs_agino_t             gino;   /* current btree rec's start inode */
341         int                     i;      /* loop index */
342         int                     icount; /* count of inodes good in irbuf */
343         size_t                  irbsize; /* size of irec buffer in bytes */
344         xfs_ino_t               ino;    /* inode number (filesystem) */
345         xfs_inobt_rec_incore_t  *irbp;  /* current irec buffer pointer */
346         xfs_inobt_rec_incore_t  *irbuf; /* start of irec buffer */
347         xfs_inobt_rec_incore_t  *irbufend; /* end of good irec buffer entries */
348         xfs_ino_t               lastino; /* last inode number returned */
349         int                     nbcluster; /* # of blocks in a cluster */
350         int                     nicluster; /* # of inodes in a cluster */
351         int                     nimask; /* mask for inode clusters */
352         int                     nirbuf; /* size of irbuf */
353         int                     rval;   /* return value error code */
354         int                     tmp;    /* result value from btree calls */
355         int                     ubcount; /* size of user's buffer */
356         int                     ubleft; /* bytes left in user's buffer */
357         char                    __user *ubufp;  /* pointer into user's buffer */
358         int                     ubelem; /* spaces used in user's buffer */
359         int                     ubused; /* bytes used by formatter */
360         xfs_buf_t               *bp;    /* ptr to on-disk inode cluster buf */
361         xfs_dinode_t            *dip;   /* ptr into bp for specific inode */
362         xfs_inode_t             *ip;    /* ptr to in-core inode struct */
363
364         /*
365          * Get the last inode value, see if there's nothing to do.
366          */
367         ino = (xfs_ino_t)*lastinop;
368         lastino = ino;
369         dip = NULL;
370         agno = XFS_INO_TO_AGNO(mp, ino);
371         agino = XFS_INO_TO_AGINO(mp, ino);
372         if (agno >= mp->m_sb.sb_agcount ||
373             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
374                 *done = 1;
375                 *ubcountp = 0;
376                 return 0;
377         }
378         if (!ubcountp || *ubcountp <= 0) {
379                 return EINVAL;
380         }
381         ubcount = *ubcountp; /* statstruct's */
382         ubleft = ubcount * statstruct_size; /* bytes */
383         *ubcountp = ubelem = 0;
384         *done = 0;
385         fmterror = 0;
386         ubufp = ubuffer;
387         nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
388                 mp->m_sb.sb_inopblock :
389                 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
390         nimask = ~(nicluster - 1);
391         nbcluster = nicluster >> mp->m_sb.sb_inopblog;
392         irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4,
393                                    KM_SLEEP | KM_MAYFAIL | KM_LARGE);
394         nirbuf = irbsize / sizeof(*irbuf);
395
396         /*
397          * Loop over the allocation groups, starting from the last
398          * inode returned; 0 means start of the allocation group.
399          */
400         rval = 0;
401         while (XFS_BULKSTAT_UBLEFT(ubleft) && agno < mp->m_sb.sb_agcount) {
402                 cond_resched();
403                 bp = NULL;
404                 down_read(&mp->m_peraglock);
405                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
406                 up_read(&mp->m_peraglock);
407                 if (error) {
408                         /*
409                          * Skip this allocation group and go to the next one.
410                          */
411                         agno++;
412                         agino = 0;
413                         continue;
414                 }
415                 agi = XFS_BUF_TO_AGI(agbp);
416                 /*
417                  * Allocate and initialize a btree cursor for ialloc btree.
418                  */
419                 cur = xfs_btree_init_cursor(mp, NULL, agbp, agno, XFS_BTNUM_INO,
420                                                 (xfs_inode_t *)0, 0);
421                 irbp = irbuf;
422                 irbufend = irbuf + nirbuf;
423                 end_of_ag = 0;
424                 /*
425                  * If we're returning in the middle of an allocation group,
426                  * we need to get the remainder of the chunk we're in.
427                  */
428                 if (agino > 0) {
429                         /*
430                          * Lookup the inode chunk that this inode lives in.
431                          */
432                         error = xfs_inobt_lookup_le(cur, agino, 0, 0, &tmp);
433                         if (!error &&   /* no I/O error */
434                             tmp &&      /* lookup succeeded */
435                                         /* got the record, should always work */
436                             !(error = xfs_inobt_get_rec(cur, &gino, &gcnt,
437                                     &gfree, &i)) &&
438                             i == 1 &&
439                                         /* this is the right chunk */
440                             agino < gino + XFS_INODES_PER_CHUNK &&
441                                         /* lastino was not last in chunk */
442                             (chunkidx = agino - gino + 1) <
443                                     XFS_INODES_PER_CHUNK &&
444                                         /* there are some left allocated */
445                             XFS_INOBT_MASKN(chunkidx,
446                                     XFS_INODES_PER_CHUNK - chunkidx) & ~gfree) {
447                                 /*
448                                  * Grab the chunk record.  Mark all the
449                                  * uninteresting inodes (because they're
450                                  * before our start point) free.
451                                  */
452                                 for (i = 0; i < chunkidx; i++) {
453                                         if (XFS_INOBT_MASK(i) & ~gfree)
454                                                 gcnt++;
455                                 }
456                                 gfree |= XFS_INOBT_MASKN(0, chunkidx);
457                                 irbp->ir_startino = gino;
458                                 irbp->ir_freecount = gcnt;
459                                 irbp->ir_free = gfree;
460                                 irbp++;
461                                 agino = gino + XFS_INODES_PER_CHUNK;
462                                 icount = XFS_INODES_PER_CHUNK - gcnt;
463                         } else {
464                                 /*
465                                  * If any of those tests failed, bump the
466                                  * inode number (just in case).
467                                  */
468                                 agino++;
469                                 icount = 0;
470                         }
471                         /*
472                          * In any case, increment to the next record.
473                          */
474                         if (!error)
475                                 error = xfs_inobt_increment(cur, 0, &tmp);
476                 } else {
477                         /*
478                          * Start of ag.  Lookup the first inode chunk.
479                          */
480                         error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &tmp);
481                         icount = 0;
482                 }
483                 /*
484                  * Loop through inode btree records in this ag,
485                  * until we run out of inodes or space in the buffer.
486                  */
487                 while (irbp < irbufend && icount < ubcount) {
488                         /*
489                          * Loop as long as we're unable to read the
490                          * inode btree.
491                          */
492                         while (error) {
493                                 agino += XFS_INODES_PER_CHUNK;
494                                 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
495                                                 be32_to_cpu(agi->agi_length))
496                                         break;
497                                 error = xfs_inobt_lookup_ge(cur, agino, 0, 0,
498                                                             &tmp);
499                                 cond_resched();
500                         }
501                         /*
502                          * If ran off the end of the ag either with an error,
503                          * or the normal way, set end and stop collecting.
504                          */
505                         if (error ||
506                             (error = xfs_inobt_get_rec(cur, &gino, &gcnt,
507                                     &gfree, &i)) ||
508                             i == 0) {
509                                 end_of_ag = 1;
510                                 break;
511                         }
512                         /*
513                          * If this chunk has any allocated inodes, save it.
514                          * Also start read-ahead now for this chunk.
515                          */
516                         if (gcnt < XFS_INODES_PER_CHUNK) {
517                                 /*
518                                  * Loop over all clusters in the next chunk.
519                                  * Do a readahead if there are any allocated
520                                  * inodes in that cluster.
521                                  */
522                                 for (agbno = XFS_AGINO_TO_AGBNO(mp, gino),
523                                      chunkidx = 0;
524                                      chunkidx < XFS_INODES_PER_CHUNK;
525                                      chunkidx += nicluster,
526                                      agbno += nbcluster) {
527                                         if (XFS_INOBT_MASKN(chunkidx,
528                                                             nicluster) & ~gfree)
529                                                 xfs_btree_reada_bufs(mp, agno,
530                                                         agbno, nbcluster);
531                                 }
532                                 irbp->ir_startino = gino;
533                                 irbp->ir_freecount = gcnt;
534                                 irbp->ir_free = gfree;
535                                 irbp++;
536                                 icount += XFS_INODES_PER_CHUNK - gcnt;
537                         }
538                         /*
539                          * Set agino to after this chunk and bump the cursor.
540                          */
541                         agino = gino + XFS_INODES_PER_CHUNK;
542                         error = xfs_inobt_increment(cur, 0, &tmp);
543                         cond_resched();
544                 }
545                 /*
546                  * Drop the btree buffers and the agi buffer.
547                  * We can't hold any of the locks these represent
548                  * when calling iget.
549                  */
550                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
551                 xfs_buf_relse(agbp);
552                 /*
553                  * Now format all the good inodes into the user's buffer.
554                  */
555                 irbufend = irbp;
556                 for (irbp = irbuf;
557                      irbp < irbufend && XFS_BULKSTAT_UBLEFT(ubleft); irbp++) {
558                         /*
559                          * Now process this chunk of inodes.
560                          */
561                         for (agino = irbp->ir_startino, chunkidx = clustidx = 0;
562                              XFS_BULKSTAT_UBLEFT(ubleft) &&
563                                 irbp->ir_freecount < XFS_INODES_PER_CHUNK;
564                              chunkidx++, clustidx++, agino++) {
565                                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
566                                 /*
567                                  * Recompute agbno if this is the
568                                  * first inode of the cluster.
569                                  *
570                                  * Careful with clustidx.   There can be
571                                  * multple clusters per chunk, a single
572                                  * cluster per chunk or a cluster that has
573                                  * inodes represented from several different
574                                  * chunks (if blocksize is large).
575                                  *
576                                  * Because of this, the starting clustidx is
577                                  * initialized to zero in this loop but must
578                                  * later be reset after reading in the cluster
579                                  * buffer.
580                                  */
581                                 if ((chunkidx & (nicluster - 1)) == 0) {
582                                         agbno = XFS_AGINO_TO_AGBNO(mp,
583                                                         irbp->ir_startino) +
584                                                 ((chunkidx & nimask) >>
585                                                  mp->m_sb.sb_inopblog);
586
587                                         if (flags & (BULKSTAT_FG_QUICK |
588                                                      BULKSTAT_FG_INLINE)) {
589                                                 ino = XFS_AGINO_TO_INO(mp, agno,
590                                                                        agino);
591                                                 bno = XFS_AGB_TO_DADDR(mp, agno,
592                                                                        agbno);
593
594                                                 /*
595                                                  * Get the inode cluster buffer
596                                                  */
597                                                 ASSERT(xfs_inode_zone != NULL);
598                                                 ip = kmem_zone_zalloc(xfs_inode_zone,
599                                                                       KM_SLEEP);
600                                                 ip->i_ino = ino;
601                                                 ip->i_mount = mp;
602                                                 spin_lock_init(&ip->i_flags_lock);
603                                                 if (bp)
604                                                         xfs_buf_relse(bp);
605                                                 error = xfs_itobp(mp, NULL, ip,
606                                                                 &dip, &bp, bno,
607                                                                 XFS_IMAP_BULKSTAT,
608                                                                 XFS_BUF_LOCK);
609                                                 if (!error)
610                                                         clustidx = ip->i_boffset / mp->m_sb.sb_inodesize;
611                                                 kmem_zone_free(xfs_inode_zone, ip);
612                                                 if (XFS_TEST_ERROR(error != 0,
613                                                                    mp, XFS_ERRTAG_BULKSTAT_READ_CHUNK,
614                                                                    XFS_RANDOM_BULKSTAT_READ_CHUNK)) {
615                                                         bp = NULL;
616                                                         ubleft = 0;
617                                                         rval = error;
618                                                         break;
619                                                 }
620                                         }
621                                 }
622                                 ino = XFS_AGINO_TO_INO(mp, agno, agino);
623                                 bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
624                                 /*
625                                  * Skip if this inode is free.
626                                  */
627                                 if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free) {
628                                         lastino = ino;
629                                         continue;
630                                 }
631                                 /*
632                                  * Count used inodes as free so we can tell
633                                  * when the chunk is used up.
634                                  */
635                                 irbp->ir_freecount++;
636                                 if (!xfs_bulkstat_use_dinode(mp, flags, bp,
637                                                              clustidx, &dip)) {
638                                         lastino = ino;
639                                         continue;
640                                 }
641                                 /*
642                                  * If we need to do an iget, cannot hold bp.
643                                  * Drop it, until starting the next cluster.
644                                  */
645                                 if ((flags & BULKSTAT_FG_INLINE) && !dip) {
646                                         if (bp)
647                                                 xfs_buf_relse(bp);
648                                         bp = NULL;
649                                 }
650
651                                 /*
652                                  * Get the inode and fill in a single buffer.
653                                  * BULKSTAT_FG_QUICK uses dip to fill it in.
654                                  * BULKSTAT_FG_IGET uses igets.
655                                  * BULKSTAT_FG_INLINE uses dip if we have an
656                                  * inline attr fork, else igets.
657                                  * See: xfs_bulkstat_one & xfs_dm_bulkstat_one.
658                                  * This is also used to count inodes/blks, etc
659                                  * in xfs_qm_quotacheck.
660                                  */
661                                 ubused = statstruct_size;
662                                 error = formatter(mp, ino, ubufp,
663                                                 ubleft, private_data,
664                                                 bno, &ubused, dip, &fmterror);
665                                 if (fmterror == BULKSTAT_RV_NOTHING) {
666                                         if (error && error != ENOENT &&
667                                                 error != EINVAL) {
668                                                 ubleft = 0;
669                                                 rval = error;
670                                                 break;
671                                         }
672                                         lastino = ino;
673                                         continue;
674                                 }
675                                 if (fmterror == BULKSTAT_RV_GIVEUP) {
676                                         ubleft = 0;
677                                         ASSERT(error);
678                                         rval = error;
679                                         break;
680                                 }
681                                 if (ubufp)
682                                         ubufp += ubused;
683                                 ubleft -= ubused;
684                                 ubelem++;
685                                 lastino = ino;
686                         }
687
688                         cond_resched();
689                 }
690
691                 if (bp)
692                         xfs_buf_relse(bp);
693
694                 /*
695                  * Set up for the next loop iteration.
696                  */
697                 if (XFS_BULKSTAT_UBLEFT(ubleft)) {
698                         if (end_of_ag) {
699                                 agno++;
700                                 agino = 0;
701                         } else
702                                 agino = XFS_INO_TO_AGINO(mp, lastino);
703                 } else
704                         break;
705         }
706         /*
707          * Done, we're either out of filesystem or space to put the data.
708          */
709         kmem_free(irbuf);
710         *ubcountp = ubelem;
711         /*
712          * Found some inodes, return them now and return the error next time.
713          */
714         if (ubelem)
715                 rval = 0;
716         if (agno >= mp->m_sb.sb_agcount) {
717                 /*
718                  * If we ran out of filesystem, mark lastino as off
719                  * the end of the filesystem, so the next call
720                  * will return immediately.
721                  */
722                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
723                 *done = 1;
724         } else
725                 *lastinop = (xfs_ino_t)lastino;
726
727         return rval;
728 }
729
730 /*
731  * Return stat information in bulk (by-inode) for the filesystem.
732  * Special case for non-sequential one inode bulkstat.
733  */
734 int                                     /* error status */
735 xfs_bulkstat_single(
736         xfs_mount_t             *mp,    /* mount point for filesystem */
737         xfs_ino_t               *lastinop, /* inode to return */
738         char                    __user *buffer, /* buffer with inode stats */
739         int                     *done)  /* 1 if there are more stats to get */
740 {
741         int                     count;  /* count value for bulkstat call */
742         int                     error;  /* return value */
743         xfs_ino_t               ino;    /* filesystem inode number */
744         int                     res;    /* result from bs1 */
745
746         /*
747          * note that requesting valid inode numbers which are not allocated
748          * to inodes will most likely cause xfs_itobp to generate warning
749          * messages about bad magic numbers. This is ok. The fact that
750          * the inode isn't actually an inode is handled by the
751          * error check below. Done this way to make the usual case faster
752          * at the expense of the error case.
753          */
754
755         ino = (xfs_ino_t)*lastinop;
756         error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t),
757                                  NULL, 0, NULL, NULL, &res);
758         if (error) {
759                 /*
760                  * Special case way failed, do it the "long" way
761                  * to see if that works.
762                  */
763                 (*lastinop)--;
764                 count = 1;
765                 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
766                                 NULL, sizeof(xfs_bstat_t), buffer,
767                                 BULKSTAT_FG_IGET, done))
768                         return error;
769                 if (count == 0 || (xfs_ino_t)*lastinop != ino)
770                         return error == EFSCORRUPTED ?
771                                 XFS_ERROR(EINVAL) : error;
772                 else
773                         return 0;
774         }
775         *done = 0;
776         return 0;
777 }
778
779 int
780 xfs_inumbers_fmt(
781         void                    __user *ubuffer, /* buffer to write to */
782         const xfs_inogrp_t      *buffer,        /* buffer to read from */
783         long                    count,          /* # of elements to read */
784         long                    *written)       /* # of bytes written */
785 {
786         if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer)))
787                 return -EFAULT;
788         *written = count * sizeof(*buffer);
789         return 0;
790 }
791
792 /*
793  * Return inode number table for the filesystem.
794  */
795 int                                     /* error status */
796 xfs_inumbers(
797         xfs_mount_t     *mp,            /* mount point for filesystem */
798         xfs_ino_t       *lastino,       /* last inode returned */
799         int             *count,         /* size of buffer/count returned */
800         void            __user *ubuffer,/* buffer with inode descriptions */
801         inumbers_fmt_pf formatter)
802 {
803         xfs_buf_t       *agbp;
804         xfs_agino_t     agino;
805         xfs_agnumber_t  agno;
806         int             bcount;
807         xfs_inogrp_t    *buffer;
808         int             bufidx;
809         xfs_btree_cur_t *cur;
810         int             error;
811         __int32_t       gcnt;
812         xfs_inofree_t   gfree;
813         xfs_agino_t     gino;
814         int             i;
815         xfs_ino_t       ino;
816         int             left;
817         int             tmp;
818
819         ino = (xfs_ino_t)*lastino;
820         agno = XFS_INO_TO_AGNO(mp, ino);
821         agino = XFS_INO_TO_AGINO(mp, ino);
822         left = *count;
823         *count = 0;
824         bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)));
825         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
826         error = bufidx = 0;
827         cur = NULL;
828         agbp = NULL;
829         while (left > 0 && agno < mp->m_sb.sb_agcount) {
830                 if (agbp == NULL) {
831                         down_read(&mp->m_peraglock);
832                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
833                         up_read(&mp->m_peraglock);
834                         if (error) {
835                                 /*
836                                  * If we can't read the AGI of this ag,
837                                  * then just skip to the next one.
838                                  */
839                                 ASSERT(cur == NULL);
840                                 agbp = NULL;
841                                 agno++;
842                                 agino = 0;
843                                 continue;
844                         }
845                         cur = xfs_btree_init_cursor(mp, NULL, agbp, agno,
846                                 XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
847                         error = xfs_inobt_lookup_ge(cur, agino, 0, 0, &tmp);
848                         if (error) {
849                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
850                                 cur = NULL;
851                                 xfs_buf_relse(agbp);
852                                 agbp = NULL;
853                                 /*
854                                  * Move up the last inode in the current
855                                  * chunk.  The lookup_ge will always get
856                                  * us the first inode in the next chunk.
857                                  */
858                                 agino += XFS_INODES_PER_CHUNK - 1;
859                                 continue;
860                         }
861                 }
862                 if ((error = xfs_inobt_get_rec(cur, &gino, &gcnt, &gfree,
863                         &i)) ||
864                     i == 0) {
865                         xfs_buf_relse(agbp);
866                         agbp = NULL;
867                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
868                         cur = NULL;
869                         agno++;
870                         agino = 0;
871                         continue;
872                 }
873                 agino = gino + XFS_INODES_PER_CHUNK - 1;
874                 buffer[bufidx].xi_startino = XFS_AGINO_TO_INO(mp, agno, gino);
875                 buffer[bufidx].xi_alloccount = XFS_INODES_PER_CHUNK - gcnt;
876                 buffer[bufidx].xi_allocmask = ~gfree;
877                 bufidx++;
878                 left--;
879                 if (bufidx == bcount) {
880                         long written;
881                         if (formatter(ubuffer, buffer, bufidx, &written)) {
882                                 error = XFS_ERROR(EFAULT);
883                                 break;
884                         }
885                         ubuffer += written;
886                         *count += bufidx;
887                         bufidx = 0;
888                 }
889                 if (left) {
890                         error = xfs_inobt_increment(cur, 0, &tmp);
891                         if (error) {
892                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
893                                 cur = NULL;
894                                 xfs_buf_relse(agbp);
895                                 agbp = NULL;
896                                 /*
897                                  * The agino value has already been bumped.
898                                  * Just try to skip up to it.
899                                  */
900                                 agino += XFS_INODES_PER_CHUNK;
901                                 continue;
902                         }
903                 }
904         }
905         if (!error) {
906                 if (bufidx) {
907                         long written;
908                         if (formatter(ubuffer, buffer, bufidx, &written))
909                                 error = XFS_ERROR(EFAULT);
910                         else
911                                 *count += bufidx;
912                 }
913                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
914         }
915         kmem_free(buffer);
916         if (cur)
917                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
918                                            XFS_BTREE_NOERROR));
919         if (agbp)
920                 xfs_buf_relse(agbp);
921         return error;
922 }