Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-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 STATIC int
43 xfs_bulkstat_one_iget(
44         xfs_mount_t     *mp,            /* mount point for filesystem */
45         xfs_ino_t       ino,            /* inode number to get data for */
46         xfs_daddr_t     bno,            /* starting bno of inode cluster */
47         xfs_bstat_t     *buf,           /* return buffer */
48         int             *stat)          /* BULKSTAT_RV_... */
49 {
50         xfs_dinode_core_t *dic;         /* dinode core info pointer */
51         xfs_inode_t     *ip;            /* incore inode pointer */
52         bhv_vnode_t     *vp;
53         int             error;
54
55         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, bno);
56         if (error) {
57                 *stat = BULKSTAT_RV_NOTHING;
58                 return error;
59         }
60
61         ASSERT(ip != NULL);
62         ASSERT(ip->i_blkno != (xfs_daddr_t)0);
63         if (ip->i_d.di_mode == 0) {
64                 *stat = BULKSTAT_RV_NOTHING;
65                 error = XFS_ERROR(ENOENT);
66                 goto out_iput;
67         }
68
69         vp = XFS_ITOV(ip);
70         dic = &ip->i_d;
71
72         /* xfs_iget returns the following without needing
73          * further change.
74          */
75         buf->bs_nlink = dic->di_nlink;
76         buf->bs_projid = dic->di_projid;
77         buf->bs_ino = ino;
78         buf->bs_mode = dic->di_mode;
79         buf->bs_uid = dic->di_uid;
80         buf->bs_gid = dic->di_gid;
81         buf->bs_size = dic->di_size;
82         vn_atime_to_bstime(vp, &buf->bs_atime);
83         buf->bs_mtime.tv_sec = dic->di_mtime.t_sec;
84         buf->bs_mtime.tv_nsec = dic->di_mtime.t_nsec;
85         buf->bs_ctime.tv_sec = dic->di_ctime.t_sec;
86         buf->bs_ctime.tv_nsec = dic->di_ctime.t_nsec;
87         buf->bs_xflags = xfs_ip2xflags(ip);
88         buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
89         buf->bs_extents = dic->di_nextents;
90         buf->bs_gen = dic->di_gen;
91         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
92         buf->bs_dmevmask = dic->di_dmevmask;
93         buf->bs_dmstate = dic->di_dmstate;
94         buf->bs_aextents = dic->di_anextents;
95
96         switch (dic->di_format) {
97         case XFS_DINODE_FMT_DEV:
98                 buf->bs_rdev = ip->i_df.if_u2.if_rdev;
99                 buf->bs_blksize = BLKDEV_IOSIZE;
100                 buf->bs_blocks = 0;
101                 break;
102         case XFS_DINODE_FMT_LOCAL:
103         case XFS_DINODE_FMT_UUID:
104                 buf->bs_rdev = 0;
105                 buf->bs_blksize = mp->m_sb.sb_blocksize;
106                 buf->bs_blocks = 0;
107                 break;
108         case XFS_DINODE_FMT_EXTENTS:
109         case XFS_DINODE_FMT_BTREE:
110                 buf->bs_rdev = 0;
111                 buf->bs_blksize = mp->m_sb.sb_blocksize;
112                 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
113                 break;
114         }
115
116  out_iput:
117         xfs_iput(ip, XFS_ILOCK_SHARED);
118         return error;
119 }
120
121 STATIC int
122 xfs_bulkstat_one_dinode(
123         xfs_mount_t     *mp,            /* mount point for filesystem */
124         xfs_ino_t       ino,            /* inode number to get data for */
125         xfs_dinode_t    *dip,           /* dinode inode pointer */
126         xfs_bstat_t     *buf)           /* return buffer */
127 {
128         xfs_dinode_core_t *dic;         /* dinode core info pointer */
129
130         dic = &dip->di_core;
131
132         /*
133          * The inode format changed when we moved the link count and
134          * made it 32 bits long.  If this is an old format inode,
135          * convert it in memory to look like a new one.  If it gets
136          * flushed to disk we will convert back before flushing or
137          * logging it.  We zero out the new projid field and the old link
138          * count field.  We'll handle clearing the pad field (the remains
139          * of the old uuid field) when we actually convert the inode to
140          * the new format. We don't change the version number so that we
141          * can distinguish this from a real new format inode.
142          */
143         if (INT_GET(dic->di_version, ARCH_CONVERT) == XFS_DINODE_VERSION_1) {
144                 buf->bs_nlink = INT_GET(dic->di_onlink, ARCH_CONVERT);
145                 buf->bs_projid = 0;
146         } else {
147                 buf->bs_nlink = INT_GET(dic->di_nlink, ARCH_CONVERT);
148                 buf->bs_projid = INT_GET(dic->di_projid, ARCH_CONVERT);
149         }
150
151         buf->bs_ino = ino;
152         buf->bs_mode = INT_GET(dic->di_mode, ARCH_CONVERT);
153         buf->bs_uid = INT_GET(dic->di_uid, ARCH_CONVERT);
154         buf->bs_gid = INT_GET(dic->di_gid, ARCH_CONVERT);
155         buf->bs_size = INT_GET(dic->di_size, ARCH_CONVERT);
156         buf->bs_atime.tv_sec = INT_GET(dic->di_atime.t_sec, ARCH_CONVERT);
157         buf->bs_atime.tv_nsec = INT_GET(dic->di_atime.t_nsec, ARCH_CONVERT);
158         buf->bs_mtime.tv_sec = INT_GET(dic->di_mtime.t_sec, ARCH_CONVERT);
159         buf->bs_mtime.tv_nsec = INT_GET(dic->di_mtime.t_nsec, ARCH_CONVERT);
160         buf->bs_ctime.tv_sec = INT_GET(dic->di_ctime.t_sec, ARCH_CONVERT);
161         buf->bs_ctime.tv_nsec = INT_GET(dic->di_ctime.t_nsec, ARCH_CONVERT);
162         buf->bs_xflags = xfs_dic2xflags(dic);
163         buf->bs_extsize = INT_GET(dic->di_extsize, ARCH_CONVERT) << mp->m_sb.sb_blocklog;
164         buf->bs_extents = INT_GET(dic->di_nextents, ARCH_CONVERT);
165         buf->bs_gen = INT_GET(dic->di_gen, ARCH_CONVERT);
166         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
167         buf->bs_dmevmask = INT_GET(dic->di_dmevmask, ARCH_CONVERT);
168         buf->bs_dmstate = INT_GET(dic->di_dmstate, ARCH_CONVERT);
169         buf->bs_aextents = INT_GET(dic->di_anextents, ARCH_CONVERT);
170
171         switch (INT_GET(dic->di_format, ARCH_CONVERT)) {
172         case XFS_DINODE_FMT_DEV:
173                 buf->bs_rdev = INT_GET(dip->di_u.di_dev, ARCH_CONVERT);
174                 buf->bs_blksize = BLKDEV_IOSIZE;
175                 buf->bs_blocks = 0;
176                 break;
177         case XFS_DINODE_FMT_LOCAL:
178         case XFS_DINODE_FMT_UUID:
179                 buf->bs_rdev = 0;
180                 buf->bs_blksize = mp->m_sb.sb_blocksize;
181                 buf->bs_blocks = 0;
182                 break;
183         case XFS_DINODE_FMT_EXTENTS:
184         case XFS_DINODE_FMT_BTREE:
185                 buf->bs_rdev = 0;
186                 buf->bs_blksize = mp->m_sb.sb_blocksize;
187                 buf->bs_blocks = INT_GET(dic->di_nblocks, ARCH_CONVERT);
188                 break;
189         }
190
191         return 0;
192 }
193
194 /*
195  * Return stat information for one inode.
196  * Return 0 if ok, else errno.
197  */
198 int                             /* error status */
199 xfs_bulkstat_one(
200         xfs_mount_t     *mp,            /* mount point for filesystem */
201         xfs_ino_t       ino,            /* inode number to get data for */
202         void            __user *buffer, /* buffer to place output in */
203         int             ubsize,         /* size of buffer */
204         void            *private_data,  /* my private data */
205         xfs_daddr_t     bno,            /* starting bno of inode cluster */
206         int             *ubused,        /* bytes used by me */
207         void            *dibuff,        /* on-disk inode buffer */
208         int             *stat)          /* BULKSTAT_RV_... */
209 {
210         xfs_bstat_t     *buf;           /* return buffer */
211         int             error = 0;      /* error value */
212         xfs_dinode_t    *dip;           /* dinode inode pointer */
213
214         dip = (xfs_dinode_t *)dibuff;
215
216         if (!buffer || ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
217             (XFS_SB_VERSION_HASQUOTA(&mp->m_sb) &&
218              (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino))) {
219                 *stat = BULKSTAT_RV_NOTHING;
220                 return XFS_ERROR(EINVAL);
221         }
222         if (ubsize < sizeof(*buf)) {
223                 *stat = BULKSTAT_RV_NOTHING;
224                 return XFS_ERROR(ENOMEM);
225         }
226
227         buf = kmem_alloc(sizeof(*buf), KM_SLEEP);
228
229         if (dip == NULL) {
230                 /* We're not being passed a pointer to a dinode.  This happens
231                  * if BULKSTAT_FG_IGET is selected.  Do the iget.
232                  */
233                 error = xfs_bulkstat_one_iget(mp, ino, bno, buf, stat);
234                 if (error)
235                         goto out_free;
236         } else {
237                 xfs_bulkstat_one_dinode(mp, ino, dip, buf);
238         }
239
240         if (copy_to_user(buffer, buf, sizeof(*buf)))  {
241                 *stat = BULKSTAT_RV_NOTHING;
242                 error =  EFAULT;
243                 goto out_free;
244         }
245
246         *stat = BULKSTAT_RV_DIDONE;
247         if (ubused)
248                 *ubused = sizeof(*buf);
249
250  out_free:
251         kmem_free(buf, sizeof(*buf));
252         return error;
253 }
254
255 /*
256  * Return stat information in bulk (by-inode) for the filesystem.
257  */
258 int                                     /* error status */
259 xfs_bulkstat(
260         xfs_mount_t             *mp,    /* mount point for filesystem */
261         xfs_ino_t               *lastinop, /* last inode returned */
262         int                     *ubcountp, /* size of buffer/count returned */
263         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
264         void                    *private_data,/* private data for formatter */
265         size_t                  statstruct_size, /* sizeof struct filling */
266         char                    __user *ubuffer, /* buffer with inode stats */
267         int                     flags,  /* defined in xfs_itable.h */
268         int                     *done)  /* 1 if there are more stats to get */
269 {
270         xfs_agblock_t           agbno=0;/* allocation group block number */
271         xfs_buf_t               *agbp;  /* agi header buffer */
272         xfs_agi_t               *agi;   /* agi header data */
273         xfs_agino_t             agino;  /* inode # in allocation group */
274         xfs_agnumber_t          agno;   /* allocation group number */
275         xfs_daddr_t             bno;    /* inode cluster start daddr */
276         int                     chunkidx; /* current index into inode chunk */
277         int                     clustidx; /* current index into inode cluster */
278         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
279         int                     end_of_ag; /* set if we've seen the ag end */
280         int                     error;  /* error code */
281         int                     fmterror;/* bulkstat formatter result */
282         __int32_t               gcnt;   /* current btree rec's count */
283         xfs_inofree_t           gfree;  /* current btree rec's free mask */
284         xfs_agino_t             gino;   /* current btree rec's start inode */
285         int                     i;      /* loop index */
286         int                     icount; /* count of inodes good in irbuf */
287         xfs_ino_t               ino;    /* inode number (filesystem) */
288         xfs_inobt_rec_t         *irbp;  /* current irec buffer pointer */
289         xfs_inobt_rec_t         *irbuf; /* start of irec buffer */
290         xfs_inobt_rec_t         *irbufend; /* end of good irec buffer entries */
291         xfs_ino_t               lastino=0; /* last inode number returned */
292         int                     nbcluster; /* # of blocks in a cluster */
293         int                     nicluster; /* # of inodes in a cluster */
294         int                     nimask; /* mask for inode clusters */
295         int                     nirbuf; /* size of irbuf */
296         int                     rval;   /* return value error code */
297         int                     tmp;    /* result value from btree calls */
298         int                     ubcount; /* size of user's buffer */
299         int                     ubleft; /* bytes left in user's buffer */
300         char                    __user *ubufp;  /* pointer into user's buffer */
301         int                     ubelem; /* spaces used in user's buffer */
302         int                     ubused; /* bytes used by formatter */
303         xfs_buf_t               *bp;    /* ptr to on-disk inode cluster buf */
304         xfs_dinode_t            *dip;   /* ptr into bp for specific inode */
305         xfs_inode_t             *ip;    /* ptr to in-core inode struct */
306
307         /*
308          * Get the last inode value, see if there's nothing to do.
309          */
310         ino = (xfs_ino_t)*lastinop;
311         dip = NULL;
312         agno = XFS_INO_TO_AGNO(mp, ino);
313         agino = XFS_INO_TO_AGINO(mp, ino);
314         if (agno >= mp->m_sb.sb_agcount ||
315             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
316                 *done = 1;
317                 *ubcountp = 0;
318                 return 0;
319         }
320         ubcount = *ubcountp; /* statstruct's */
321         ubleft = ubcount * statstruct_size; /* bytes */
322         *ubcountp = ubelem = 0;
323         *done = 0;
324         fmterror = 0;
325         ubufp = ubuffer;
326         nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
327                 mp->m_sb.sb_inopblock :
328                 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
329         nimask = ~(nicluster - 1);
330         nbcluster = nicluster >> mp->m_sb.sb_inopblog;
331         /*
332          * Allocate a page-sized buffer for inode btree records.
333          * We could try allocating something smaller, but for normal
334          * calls we'll always (potentially) need the whole page.
335          */
336         irbuf = kmem_alloc(NBPC, KM_SLEEP);
337         nirbuf = NBPC / sizeof(*irbuf);
338         /*
339          * Loop over the allocation groups, starting from the last
340          * inode returned; 0 means start of the allocation group.
341          */
342         rval = 0;
343         while (ubleft >= statstruct_size && agno < mp->m_sb.sb_agcount) {
344                 bp = NULL;
345                 down_read(&mp->m_peraglock);
346                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
347                 up_read(&mp->m_peraglock);
348                 if (error) {
349                         /*
350                          * Skip this allocation group and go to the next one.
351                          */
352                         agno++;
353                         agino = 0;
354                         continue;
355                 }
356                 agi = XFS_BUF_TO_AGI(agbp);
357                 /*
358                  * Allocate and initialize a btree cursor for ialloc btree.
359                  */
360                 cur = xfs_btree_init_cursor(mp, NULL, agbp, agno, XFS_BTNUM_INO,
361                         (xfs_inode_t *)0, 0);
362                 irbp = irbuf;
363                 irbufend = irbuf + nirbuf;
364                 end_of_ag = 0;
365                 /*
366                  * If we're returning in the middle of an allocation group,
367                  * we need to get the remainder of the chunk we're in.
368                  */
369                 if (agino > 0) {
370                         /*
371                          * Lookup the inode chunk that this inode lives in.
372                          */
373                         error = xfs_inobt_lookup_le(cur, agino, 0, 0, &tmp);
374                         if (!error &&   /* no I/O error */
375                             tmp &&      /* lookup succeeded */
376                                         /* got the record, should always work */
377                             !(error = xfs_inobt_get_rec(cur, &gino, &gcnt,
378                                     &gfree, &i)) &&
379                             i == 1 &&
380                                         /* this is the right chunk */
381                             agino < gino + XFS_INODES_PER_CHUNK &&
382                                         /* lastino was not last in chunk */
383                             (chunkidx = agino - gino + 1) <
384                                     XFS_INODES_PER_CHUNK &&
385                                         /* there are some left allocated */
386                             XFS_INOBT_MASKN(chunkidx,
387                                     XFS_INODES_PER_CHUNK - chunkidx) & ~gfree) {
388                                 /*
389                                  * Grab the chunk record.  Mark all the
390                                  * uninteresting inodes (because they're
391                                  * before our start point) free.
392                                  */
393                                 for (i = 0; i < chunkidx; i++) {
394                                         if (XFS_INOBT_MASK(i) & ~gfree)
395                                                 gcnt++;
396                                 }
397                                 gfree |= XFS_INOBT_MASKN(0, chunkidx);
398                                 INT_SET(irbp->ir_startino, ARCH_CONVERT, gino);
399                                 INT_SET(irbp->ir_freecount, ARCH_CONVERT, gcnt);
400                                 INT_SET(irbp->ir_free, ARCH_CONVERT, gfree);
401                                 irbp++;
402                                 agino = gino + XFS_INODES_PER_CHUNK;
403                                 icount = XFS_INODES_PER_CHUNK - gcnt;
404                         } else {
405                                 /*
406                                  * If any of those tests failed, bump the
407                                  * inode number (just in case).
408                                  */
409                                 agino++;
410                                 icount = 0;
411                         }
412                         /*
413                          * In any case, increment to the next record.
414                          */
415                         if (!error)
416                                 error = xfs_inobt_increment(cur, 0, &tmp);
417                 } else {
418                         /*
419                          * Start of ag.  Lookup the first inode chunk.
420                          */
421                         error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &tmp);
422                         icount = 0;
423                 }
424                 /*
425                  * Loop through inode btree records in this ag,
426                  * until we run out of inodes or space in the buffer.
427                  */
428                 while (irbp < irbufend && icount < ubcount) {
429                         /*
430                          * Loop as long as we're unable to read the
431                          * inode btree.
432                          */
433                         while (error) {
434                                 agino += XFS_INODES_PER_CHUNK;
435                                 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
436                                                 be32_to_cpu(agi->agi_length))
437                                         break;
438                                 error = xfs_inobt_lookup_ge(cur, agino, 0, 0,
439                                                             &tmp);
440                         }
441                         /*
442                          * If ran off the end of the ag either with an error,
443                          * or the normal way, set end and stop collecting.
444                          */
445                         if (error ||
446                             (error = xfs_inobt_get_rec(cur, &gino, &gcnt,
447                                     &gfree, &i)) ||
448                             i == 0) {
449                                 end_of_ag = 1;
450                                 break;
451                         }
452                         /*
453                          * If this chunk has any allocated inodes, save it.
454                          */
455                         if (gcnt < XFS_INODES_PER_CHUNK) {
456                                 INT_SET(irbp->ir_startino, ARCH_CONVERT, gino);
457                                 INT_SET(irbp->ir_freecount, ARCH_CONVERT, gcnt);
458                                 INT_SET(irbp->ir_free, ARCH_CONVERT, gfree);
459                                 irbp++;
460                                 icount += XFS_INODES_PER_CHUNK - gcnt;
461                         }
462                         /*
463                          * Set agino to after this chunk and bump the cursor.
464                          */
465                         agino = gino + XFS_INODES_PER_CHUNK;
466                         error = xfs_inobt_increment(cur, 0, &tmp);
467                 }
468                 /*
469                  * Drop the btree buffers and the agi buffer.
470                  * We can't hold any of the locks these represent
471                  * when calling iget.
472                  */
473                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
474                 xfs_buf_relse(agbp);
475                 /*
476                  * Now format all the good inodes into the user's buffer.
477                  */
478                 irbufend = irbp;
479                 for (irbp = irbuf;
480                      irbp < irbufend && ubleft >= statstruct_size; irbp++) {
481                         /*
482                          * Read-ahead the next chunk's worth of inodes.
483                          */
484                         if (&irbp[1] < irbufend) {
485                                 /*
486                                  * Loop over all clusters in the next chunk.
487                                  * Do a readahead if there are any allocated
488                                  * inodes in that cluster.
489                                  */
490                                 for (agbno = XFS_AGINO_TO_AGBNO(mp,
491                                                         INT_GET(irbp[1].ir_startino, ARCH_CONVERT)),
492                                      chunkidx = 0;
493                                      chunkidx < XFS_INODES_PER_CHUNK;
494                                      chunkidx += nicluster,
495                                      agbno += nbcluster) {
496                                         if (XFS_INOBT_MASKN(chunkidx,
497                                                             nicluster) &
498                                             ~(INT_GET(irbp[1].ir_free, ARCH_CONVERT)))
499                                                 xfs_btree_reada_bufs(mp, agno,
500                                                         agbno, nbcluster);
501                                 }
502                         }
503                         /*
504                          * Now process this chunk of inodes.
505                          */
506                         for (agino = INT_GET(irbp->ir_startino, ARCH_CONVERT), chunkidx = 0, clustidx = 0;
507                              ubleft > 0 &&
508                                 INT_GET(irbp->ir_freecount, ARCH_CONVERT) < XFS_INODES_PER_CHUNK;
509                              chunkidx++, clustidx++, agino++) {
510                                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
511                                 /*
512                                  * Recompute agbno if this is the
513                                  * first inode of the cluster.
514                                  *
515                                  * Careful with clustidx.   There can be
516                                  * multple clusters per chunk, a single
517                                  * cluster per chunk or a cluster that has
518                                  * inodes represented from several different
519                                  * chunks (if blocksize is large).
520                                  *
521                                  * Because of this, the starting clustidx is
522                                  * initialized to zero in this loop but must
523                                  * later be reset after reading in the cluster
524                                  * buffer.
525                                  */
526                                 if ((chunkidx & (nicluster - 1)) == 0) {
527                                         agbno = XFS_AGINO_TO_AGBNO(mp,
528                                                         INT_GET(irbp->ir_startino, ARCH_CONVERT)) +
529                                                 ((chunkidx & nimask) >>
530                                                  mp->m_sb.sb_inopblog);
531
532                                         if (flags & BULKSTAT_FG_QUICK) {
533                                                 ino = XFS_AGINO_TO_INO(mp, agno,
534                                                                        agino);
535                                                 bno = XFS_AGB_TO_DADDR(mp, agno,
536                                                                        agbno);
537
538                                                 /*
539                                                  * Get the inode cluster buffer
540                                                  */
541                                                 ASSERT(xfs_inode_zone != NULL);
542                                                 ip = kmem_zone_zalloc(xfs_inode_zone,
543                                                                       KM_SLEEP);
544                                                 ip->i_ino = ino;
545                                                 ip->i_mount = mp;
546                                                 if (bp)
547                                                         xfs_buf_relse(bp);
548                                                 error = xfs_itobp(mp, NULL, ip,
549                                                                 &dip, &bp, bno,
550                                                                 XFS_IMAP_BULKSTAT);
551                                                 if (!error)
552                                                         clustidx = ip->i_boffset / mp->m_sb.sb_inodesize;
553                                                 kmem_zone_free(xfs_inode_zone, ip);
554                                                 if (XFS_TEST_ERROR(error != 0,
555                                                                    mp, XFS_ERRTAG_BULKSTAT_READ_CHUNK,
556                                                                    XFS_RANDOM_BULKSTAT_READ_CHUNK)) {
557                                                         bp = NULL;
558                                                         ubleft = 0;
559                                                         rval = error;
560                                                         break;
561                                                 }
562                                         }
563                                 }
564                                 /*
565                                  * Skip if this inode is free.
566                                  */
567                                 if (XFS_INOBT_MASK(chunkidx) & INT_GET(irbp->ir_free, ARCH_CONVERT))
568                                         continue;
569                                 /*
570                                  * Count used inodes as free so we can tell
571                                  * when the chunk is used up.
572                                  */
573                                 INT_MOD(irbp->ir_freecount, ARCH_CONVERT, +1);
574                                 ino = XFS_AGINO_TO_INO(mp, agno, agino);
575                                 bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
576                                 if (flags & BULKSTAT_FG_QUICK) {
577                                         dip = (xfs_dinode_t *)xfs_buf_offset(bp,
578                                               (clustidx << mp->m_sb.sb_inodelog));
579
580                                         if (INT_GET(dip->di_core.di_magic, ARCH_CONVERT)
581                                                     != XFS_DINODE_MAGIC
582                                             || !XFS_DINODE_GOOD_VERSION(
583                                                     INT_GET(dip->di_core.di_version, ARCH_CONVERT)))
584                                                 continue;
585                                 }
586
587                                 /*
588                                  * Get the inode and fill in a single buffer.
589                                  * BULKSTAT_FG_QUICK uses dip to fill it in.
590                                  * BULKSTAT_FG_IGET uses igets.
591                                  * See: xfs_bulkstat_one & xfs_dm_bulkstat_one.
592                                  * This is also used to count inodes/blks, etc
593                                  * in xfs_qm_quotacheck.
594                                  */
595                                 ubused = statstruct_size;
596                                 error = formatter(mp, ino, ubufp,
597                                                 ubleft, private_data,
598                                                 bno, &ubused, dip, &fmterror);
599                                 if (fmterror == BULKSTAT_RV_NOTHING) {
600                                         if (error == ENOMEM)
601                                                 ubleft = 0;
602                                         continue;
603                                 }
604                                 if (fmterror == BULKSTAT_RV_GIVEUP) {
605                                         ubleft = 0;
606                                         ASSERT(error);
607                                         rval = error;
608                                         break;
609                                 }
610                                 if (ubufp)
611                                         ubufp += ubused;
612                                 ubleft -= ubused;
613                                 ubelem++;
614                                 lastino = ino;
615                         }
616                 }
617
618                 if (bp)
619                         xfs_buf_relse(bp);
620
621                 /*
622                  * Set up for the next loop iteration.
623                  */
624                 if (ubleft > 0) {
625                         if (end_of_ag) {
626                                 agno++;
627                                 agino = 0;
628                         } else
629                                 agino = XFS_INO_TO_AGINO(mp, lastino);
630                 } else
631                         break;
632         }
633         /*
634          * Done, we're either out of filesystem or space to put the data.
635          */
636         kmem_free(irbuf, NBPC);
637         *ubcountp = ubelem;
638         if (agno >= mp->m_sb.sb_agcount) {
639                 /*
640                  * If we ran out of filesystem, mark lastino as off
641                  * the end of the filesystem, so the next call
642                  * will return immediately.
643                  */
644                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
645                 *done = 1;
646         } else
647                 *lastinop = (xfs_ino_t)lastino;
648
649         return rval;
650 }
651
652 /*
653  * Return stat information in bulk (by-inode) for the filesystem.
654  * Special case for non-sequential one inode bulkstat.
655  */
656 int                                     /* error status */
657 xfs_bulkstat_single(
658         xfs_mount_t             *mp,    /* mount point for filesystem */
659         xfs_ino_t               *lastinop, /* inode to return */
660         char                    __user *buffer, /* buffer with inode stats */
661         int                     *done)  /* 1 if there are more stats to get */
662 {
663         int                     count;  /* count value for bulkstat call */
664         int                     error;  /* return value */
665         xfs_ino_t               ino;    /* filesystem inode number */
666         int                     res;    /* result from bs1 */
667
668         /*
669          * note that requesting valid inode numbers which are not allocated
670          * to inodes will most likely cause xfs_itobp to generate warning
671          * messages about bad magic numbers. This is ok. The fact that
672          * the inode isn't actually an inode is handled by the
673          * error check below. Done this way to make the usual case faster
674          * at the expense of the error case.
675          */
676
677         ino = (xfs_ino_t)*lastinop;
678         error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t),
679                                  NULL, 0, NULL, NULL, &res);
680         if (error) {
681                 /*
682                  * Special case way failed, do it the "long" way
683                  * to see if that works.
684                  */
685                 (*lastinop)--;
686                 count = 1;
687                 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
688                                 NULL, sizeof(xfs_bstat_t), buffer,
689                                 BULKSTAT_FG_IGET, done))
690                         return error;
691                 if (count == 0 || (xfs_ino_t)*lastinop != ino)
692                         return error == EFSCORRUPTED ?
693                                 XFS_ERROR(EINVAL) : error;
694                 else
695                         return 0;
696         }
697         *done = 0;
698         return 0;
699 }
700
701 /*
702  * Return inode number table for the filesystem.
703  */
704 int                                     /* error status */
705 xfs_inumbers(
706         xfs_mount_t     *mp,            /* mount point for filesystem */
707         xfs_ino_t       *lastino,       /* last inode returned */
708         int             *count,         /* size of buffer/count returned */
709         xfs_inogrp_t    __user *ubuffer)/* buffer with inode descriptions */
710 {
711         xfs_buf_t       *agbp;
712         xfs_agino_t     agino;
713         xfs_agnumber_t  agno;
714         int             bcount;
715         xfs_inogrp_t    *buffer;
716         int             bufidx;
717         xfs_btree_cur_t *cur;
718         int             error;
719         __int32_t       gcnt;
720         xfs_inofree_t   gfree;
721         xfs_agino_t     gino;
722         int             i;
723         xfs_ino_t       ino;
724         int             left;
725         int             tmp;
726
727         ino = (xfs_ino_t)*lastino;
728         agno = XFS_INO_TO_AGNO(mp, ino);
729         agino = XFS_INO_TO_AGINO(mp, ino);
730         left = *count;
731         *count = 0;
732         bcount = MIN(left, (int)(NBPP / sizeof(*buffer)));
733         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
734         error = bufidx = 0;
735         cur = NULL;
736         agbp = NULL;
737         while (left > 0 && agno < mp->m_sb.sb_agcount) {
738                 if (agbp == NULL) {
739                         down_read(&mp->m_peraglock);
740                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
741                         up_read(&mp->m_peraglock);
742                         if (error) {
743                                 /*
744                                  * If we can't read the AGI of this ag,
745                                  * then just skip to the next one.
746                                  */
747                                 ASSERT(cur == NULL);
748                                 agbp = NULL;
749                                 agno++;
750                                 agino = 0;
751                                 continue;
752                         }
753                         cur = xfs_btree_init_cursor(mp, NULL, agbp, agno,
754                                 XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
755                         error = xfs_inobt_lookup_ge(cur, agino, 0, 0, &tmp);
756                         if (error) {
757                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
758                                 cur = NULL;
759                                 xfs_buf_relse(agbp);
760                                 agbp = NULL;
761                                 /*
762                                  * Move up the the last inode in the current
763                                  * chunk.  The lookup_ge will always get
764                                  * us the first inode in the next chunk.
765                                  */
766                                 agino += XFS_INODES_PER_CHUNK - 1;
767                                 continue;
768                         }
769                 }
770                 if ((error = xfs_inobt_get_rec(cur, &gino, &gcnt, &gfree,
771                         &i)) ||
772                     i == 0) {
773                         xfs_buf_relse(agbp);
774                         agbp = NULL;
775                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
776                         cur = NULL;
777                         agno++;
778                         agino = 0;
779                         continue;
780                 }
781                 agino = gino + XFS_INODES_PER_CHUNK - 1;
782                 buffer[bufidx].xi_startino = XFS_AGINO_TO_INO(mp, agno, gino);
783                 buffer[bufidx].xi_alloccount = XFS_INODES_PER_CHUNK - gcnt;
784                 buffer[bufidx].xi_allocmask = ~gfree;
785                 bufidx++;
786                 left--;
787                 if (bufidx == bcount) {
788                         if (copy_to_user(ubuffer, buffer,
789                                         bufidx * sizeof(*buffer))) {
790                                 error = XFS_ERROR(EFAULT);
791                                 break;
792                         }
793                         ubuffer += bufidx;
794                         *count += bufidx;
795                         bufidx = 0;
796                 }
797                 if (left) {
798                         error = xfs_inobt_increment(cur, 0, &tmp);
799                         if (error) {
800                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
801                                 cur = NULL;
802                                 xfs_buf_relse(agbp);
803                                 agbp = NULL;
804                                 /*
805                                  * The agino value has already been bumped.
806                                  * Just try to skip up to it.
807                                  */
808                                 agino += XFS_INODES_PER_CHUNK;
809                                 continue;
810                         }
811                 }
812         }
813         if (!error) {
814                 if (bufidx) {
815                         if (copy_to_user(ubuffer, buffer,
816                                         bufidx * sizeof(*buffer)))
817                                 error = XFS_ERROR(EFAULT);
818                         else
819                                 *count += bufidx;
820                 }
821                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
822         }
823         kmem_free(buffer, bcount * sizeof(*buffer));
824         if (cur)
825                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
826                                            XFS_BTREE_NOERROR));
827         if (agbp)
828                 xfs_buf_relse(agbp);
829         return error;
830 }