[PATCH] skge: error handling on resume
[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_dir.h"
28 #include "xfs_dir2.h"
29 #include "xfs_dmapi.h"
30 #include "xfs_mount.h"
31 #include "xfs_bmap_btree.h"
32 #include "xfs_alloc_btree.h"
33 #include "xfs_ialloc_btree.h"
34 #include "xfs_dir_sf.h"
35 #include "xfs_dir2_sf.h"
36 #include "xfs_attr_sf.h"
37 #include "xfs_dinode.h"
38 #include "xfs_inode.h"
39 #include "xfs_ialloc.h"
40 #include "xfs_itable.h"
41 #include "xfs_error.h"
42 #include "xfs_btree.h"
43
44 #ifndef HAVE_USERACC
45 #define useracc(ubuffer, size, flags, foo) (0)
46 #define unuseracc(ubuffer, size, flags)
47 #endif
48
49 STATIC int
50 xfs_bulkstat_one_iget(
51         xfs_mount_t     *mp,            /* mount point for filesystem */
52         xfs_ino_t       ino,            /* inode number to get data for */
53         xfs_daddr_t     bno,            /* starting bno of inode cluster */
54         xfs_bstat_t     *buf,           /* return buffer */
55         int             *stat)          /* BULKSTAT_RV_... */
56 {
57         xfs_dinode_core_t *dic;         /* dinode core info pointer */
58         xfs_inode_t     *ip;            /* incore inode pointer */
59         int             error;
60
61         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, bno);
62         if (error) {
63                 *stat = BULKSTAT_RV_NOTHING;
64                 return error;
65         }
66
67         ASSERT(ip != NULL);
68         ASSERT(ip->i_blkno != (xfs_daddr_t)0);
69         if (ip->i_d.di_mode == 0) {
70                 *stat = BULKSTAT_RV_NOTHING;
71                 error = XFS_ERROR(ENOENT);
72                 goto out_iput;
73         }
74
75         dic = &ip->i_d;
76
77         /* xfs_iget returns the following without needing
78          * further change.
79          */
80         buf->bs_nlink = dic->di_nlink;
81         buf->bs_projid = dic->di_projid;
82         buf->bs_ino = ino;
83         buf->bs_mode = dic->di_mode;
84         buf->bs_uid = dic->di_uid;
85         buf->bs_gid = dic->di_gid;
86         buf->bs_size = dic->di_size;
87         buf->bs_atime.tv_sec = dic->di_atime.t_sec;
88         buf->bs_atime.tv_nsec = dic->di_atime.t_nsec;
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  out_iput:
123         xfs_iput(ip, XFS_ILOCK_SHARED);
124         return error;
125 }
126
127 STATIC int
128 xfs_bulkstat_one_dinode(
129         xfs_mount_t     *mp,            /* mount point for filesystem */
130         xfs_ino_t       ino,            /* inode number to get data for */
131         xfs_dinode_t    *dip,           /* dinode inode pointer */
132         xfs_bstat_t     *buf)           /* return buffer */
133 {
134         xfs_dinode_core_t *dic;         /* dinode core info pointer */
135
136         dic = &dip->di_core;
137
138         /*
139          * The inode format changed when we moved the link count and
140          * made it 32 bits long.  If this is an old format inode,
141          * convert it in memory to look like a new one.  If it gets
142          * flushed to disk we will convert back before flushing or
143          * logging it.  We zero out the new projid field and the old link
144          * count field.  We'll handle clearing the pad field (the remains
145          * of the old uuid field) when we actually convert the inode to
146          * the new format. We don't change the version number so that we
147          * can distinguish this from a real new format inode.
148          */
149         if (INT_GET(dic->di_version, ARCH_CONVERT) == XFS_DINODE_VERSION_1) {
150                 buf->bs_nlink = INT_GET(dic->di_onlink, ARCH_CONVERT);
151                 buf->bs_projid = 0;
152         } else {
153                 buf->bs_nlink = INT_GET(dic->di_nlink, ARCH_CONVERT);
154                 buf->bs_projid = INT_GET(dic->di_projid, ARCH_CONVERT);
155         }
156
157         buf->bs_ino = ino;
158         buf->bs_mode = INT_GET(dic->di_mode, ARCH_CONVERT);
159         buf->bs_uid = INT_GET(dic->di_uid, ARCH_CONVERT);
160         buf->bs_gid = INT_GET(dic->di_gid, ARCH_CONVERT);
161         buf->bs_size = INT_GET(dic->di_size, ARCH_CONVERT);
162         buf->bs_atime.tv_sec = INT_GET(dic->di_atime.t_sec, ARCH_CONVERT);
163         buf->bs_atime.tv_nsec = INT_GET(dic->di_atime.t_nsec, ARCH_CONVERT);
164         buf->bs_mtime.tv_sec = INT_GET(dic->di_mtime.t_sec, ARCH_CONVERT);
165         buf->bs_mtime.tv_nsec = INT_GET(dic->di_mtime.t_nsec, ARCH_CONVERT);
166         buf->bs_ctime.tv_sec = INT_GET(dic->di_ctime.t_sec, ARCH_CONVERT);
167         buf->bs_ctime.tv_nsec = INT_GET(dic->di_ctime.t_nsec, ARCH_CONVERT);
168         buf->bs_xflags = xfs_dic2xflags(dic);
169         buf->bs_extsize = INT_GET(dic->di_extsize, ARCH_CONVERT) << mp->m_sb.sb_blocklog;
170         buf->bs_extents = INT_GET(dic->di_nextents, ARCH_CONVERT);
171         buf->bs_gen = INT_GET(dic->di_gen, ARCH_CONVERT);
172         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
173         buf->bs_dmevmask = INT_GET(dic->di_dmevmask, ARCH_CONVERT);
174         buf->bs_dmstate = INT_GET(dic->di_dmstate, ARCH_CONVERT);
175         buf->bs_aextents = INT_GET(dic->di_anextents, ARCH_CONVERT);
176
177         switch (INT_GET(dic->di_format, ARCH_CONVERT)) {
178         case XFS_DINODE_FMT_DEV:
179                 buf->bs_rdev = INT_GET(dip->di_u.di_dev, ARCH_CONVERT);
180                 buf->bs_blksize = BLKDEV_IOSIZE;
181                 buf->bs_blocks = 0;
182                 break;
183         case XFS_DINODE_FMT_LOCAL:
184         case XFS_DINODE_FMT_UUID:
185                 buf->bs_rdev = 0;
186                 buf->bs_blksize = mp->m_sb.sb_blocksize;
187                 buf->bs_blocks = 0;
188                 break;
189         case XFS_DINODE_FMT_EXTENTS:
190         case XFS_DINODE_FMT_BTREE:
191                 buf->bs_rdev = 0;
192                 buf->bs_blksize = mp->m_sb.sb_blocksize;
193                 buf->bs_blocks = INT_GET(dic->di_nblocks, ARCH_CONVERT);
194                 break;
195         }
196
197         return 0;
198 }
199
200 /*
201  * Return stat information for one inode.
202  * Return 0 if ok, else errno.
203  */
204 int                             /* error status */
205 xfs_bulkstat_one(
206         xfs_mount_t     *mp,            /* mount point for filesystem */
207         xfs_ino_t       ino,            /* inode number to get data for */
208         void            __user *buffer, /* buffer to place output in */
209         int             ubsize,         /* size of buffer */
210         void            *private_data,  /* my private data */
211         xfs_daddr_t     bno,            /* starting bno of inode cluster */
212         int             *ubused,        /* bytes used by me */
213         void            *dibuff,        /* on-disk inode buffer */
214         int             *stat)          /* BULKSTAT_RV_... */
215 {
216         xfs_bstat_t     *buf;           /* return buffer */
217         int             error = 0;      /* error value */
218         xfs_dinode_t    *dip;           /* dinode inode pointer */
219
220         dip = (xfs_dinode_t *)dibuff;
221
222         if (!buffer || ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
223             (XFS_SB_VERSION_HASQUOTA(&mp->m_sb) &&
224              (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino))) {
225                 *stat = BULKSTAT_RV_NOTHING;
226                 return XFS_ERROR(EINVAL);
227         }
228         if (ubsize < sizeof(*buf)) {
229                 *stat = BULKSTAT_RV_NOTHING;
230                 return XFS_ERROR(ENOMEM);
231         }
232
233         buf = kmem_alloc(sizeof(*buf), KM_SLEEP);
234
235         if (dip == NULL) {
236                 /* We're not being passed a pointer to a dinode.  This happens
237                  * if BULKSTAT_FG_IGET is selected.  Do the iget.
238                  */
239                 error = xfs_bulkstat_one_iget(mp, ino, bno, buf, stat);
240                 if (error)
241                         goto out_free;
242         } else {
243                 xfs_bulkstat_one_dinode(mp, ino, dip, buf);
244         }
245
246         if (copy_to_user(buffer, buf, sizeof(*buf)))  {
247                 *stat = BULKSTAT_RV_NOTHING;
248                 error =  EFAULT;
249                 goto out_free;
250         }
251
252         *stat = BULKSTAT_RV_DIDONE;
253         if (ubused)
254                 *ubused = sizeof(*buf);
255
256  out_free:
257         kmem_free(buf, sizeof(*buf));
258         return error;
259 }
260
261 /*
262  * Return stat information in bulk (by-inode) for the filesystem.
263  */
264 int                                     /* error status */
265 xfs_bulkstat(
266         xfs_mount_t             *mp,    /* mount point for filesystem */
267         xfs_ino_t               *lastinop, /* last inode returned */
268         int                     *ubcountp, /* size of buffer/count returned */
269         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
270         void                    *private_data,/* private data for formatter */
271         size_t                  statstruct_size, /* sizeof struct filling */
272         char                    __user *ubuffer, /* buffer with inode stats */
273         int                     flags,  /* defined in xfs_itable.h */
274         int                     *done)  /* 1 if there're more stats to get */
275 {
276         xfs_agblock_t           agbno=0;/* allocation group block number */
277         xfs_buf_t               *agbp;  /* agi header buffer */
278         xfs_agi_t               *agi;   /* agi header data */
279         xfs_agino_t             agino;  /* inode # in allocation group */
280         xfs_agnumber_t          agno;   /* allocation group number */
281         xfs_daddr_t             bno;    /* inode cluster start daddr */
282         int                     chunkidx; /* current index into inode chunk */
283         int                     clustidx; /* current index into inode cluster */
284         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
285         int                     end_of_ag; /* set if we've seen the ag end */
286         int                     error;  /* error code */
287         int                     fmterror;/* bulkstat formatter result */
288         __int32_t               gcnt;   /* current btree rec's count */
289         xfs_inofree_t           gfree;  /* current btree rec's free mask */
290         xfs_agino_t             gino;   /* current btree rec's start inode */
291         int                     i;      /* loop index */
292         int                     icount; /* count of inodes good in irbuf */
293         xfs_ino_t               ino;    /* inode number (filesystem) */
294         xfs_inobt_rec_t         *irbp;  /* current irec buffer pointer */
295         xfs_inobt_rec_t         *irbuf; /* start of irec buffer */
296         xfs_inobt_rec_t         *irbufend; /* end of good irec buffer entries */
297         xfs_ino_t               lastino=0; /* last inode number returned */
298         int                     nbcluster; /* # of blocks in a cluster */
299         int                     nicluster; /* # of inodes in a cluster */
300         int                     nimask; /* mask for inode clusters */
301         int                     nirbuf; /* size of irbuf */
302         int                     rval;   /* return value error code */
303         int                     tmp;    /* result value from btree calls */
304         int                     ubcount; /* size of user's buffer */
305         int                     ubleft; /* bytes left in user's buffer */
306         char                    __user *ubufp;  /* pointer into user's buffer */
307         int                     ubelem; /* spaces used in user's buffer */
308         int                     ubused; /* bytes used by formatter */
309         xfs_buf_t               *bp;    /* ptr to on-disk inode cluster buf */
310         xfs_dinode_t            *dip;   /* ptr into bp for specific inode */
311         xfs_inode_t             *ip;    /* ptr to in-core inode struct */
312
313         /*
314          * Get the last inode value, see if there's nothing to do.
315          */
316         ino = (xfs_ino_t)*lastinop;
317         dip = NULL;
318         agno = XFS_INO_TO_AGNO(mp, ino);
319         agino = XFS_INO_TO_AGINO(mp, ino);
320         if (agno >= mp->m_sb.sb_agcount ||
321             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
322                 *done = 1;
323                 *ubcountp = 0;
324                 return 0;
325         }
326         ubcount = *ubcountp; /* statstruct's */
327         ubleft = ubcount * statstruct_size; /* bytes */
328         *ubcountp = ubelem = 0;
329         *done = 0;
330         fmterror = 0;
331         ubufp = ubuffer;
332         nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
333                 mp->m_sb.sb_inopblock :
334                 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
335         nimask = ~(nicluster - 1);
336         nbcluster = nicluster >> mp->m_sb.sb_inopblog;
337         /*
338          * Lock down the user's buffer. If a buffer was not sent, as in the case
339          * disk quota code calls here, we skip this.
340          */
341         if (ubuffer &&
342             (error = useracc(ubuffer, ubcount * statstruct_size,
343                         (B_READ|B_PHYS), NULL))) {
344                 return error;
345         }
346         /*
347          * Allocate a page-sized buffer for inode btree records.
348          * We could try allocating something smaller, but for normal
349          * calls we'll always (potentially) need the whole page.
350          */
351         irbuf = kmem_alloc(NBPC, KM_SLEEP);
352         nirbuf = NBPC / sizeof(*irbuf);
353         /*
354          * Loop over the allocation groups, starting from the last
355          * inode returned; 0 means start of the allocation group.
356          */
357         rval = 0;
358         while (ubleft >= statstruct_size && agno < mp->m_sb.sb_agcount) {
359                 bp = NULL;
360                 down_read(&mp->m_peraglock);
361                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
362                 up_read(&mp->m_peraglock);
363                 if (error) {
364                         /*
365                          * Skip this allocation group and go to the next one.
366                          */
367                         agno++;
368                         agino = 0;
369                         continue;
370                 }
371                 agi = XFS_BUF_TO_AGI(agbp);
372                 /*
373                  * Allocate and initialize a btree cursor for ialloc btree.
374                  */
375                 cur = xfs_btree_init_cursor(mp, NULL, agbp, agno, XFS_BTNUM_INO,
376                         (xfs_inode_t *)0, 0);
377                 irbp = irbuf;
378                 irbufend = irbuf + nirbuf;
379                 end_of_ag = 0;
380                 /*
381                  * If we're returning in the middle of an allocation group,
382                  * we need to get the remainder of the chunk we're in.
383                  */
384                 if (agino > 0) {
385                         /*
386                          * Lookup the inode chunk that this inode lives in.
387                          */
388                         error = xfs_inobt_lookup_le(cur, agino, 0, 0, &tmp);
389                         if (!error &&   /* no I/O error */
390                             tmp &&      /* lookup succeeded */
391                                         /* got the record, should always work */
392                             !(error = xfs_inobt_get_rec(cur, &gino, &gcnt,
393                                     &gfree, &i)) &&
394                             i == 1 &&
395                                         /* this is the right chunk */
396                             agino < gino + XFS_INODES_PER_CHUNK &&
397                                         /* lastino was not last in chunk */
398                             (chunkidx = agino - gino + 1) <
399                                     XFS_INODES_PER_CHUNK &&
400                                         /* there are some left allocated */
401                             XFS_INOBT_MASKN(chunkidx,
402                                     XFS_INODES_PER_CHUNK - chunkidx) & ~gfree) {
403                                 /*
404                                  * Grab the chunk record.  Mark all the
405                                  * uninteresting inodes (because they're
406                                  * before our start point) free.
407                                  */
408                                 for (i = 0; i < chunkidx; i++) {
409                                         if (XFS_INOBT_MASK(i) & ~gfree)
410                                                 gcnt++;
411                                 }
412                                 gfree |= XFS_INOBT_MASKN(0, chunkidx);
413                                 INT_SET(irbp->ir_startino, ARCH_CONVERT, gino);
414                                 INT_SET(irbp->ir_freecount, ARCH_CONVERT, gcnt);
415                                 INT_SET(irbp->ir_free, ARCH_CONVERT, gfree);
416                                 irbp++;
417                                 agino = gino + XFS_INODES_PER_CHUNK;
418                                 icount = XFS_INODES_PER_CHUNK - gcnt;
419                         } else {
420                                 /*
421                                  * If any of those tests failed, bump the
422                                  * inode number (just in case).
423                                  */
424                                 agino++;
425                                 icount = 0;
426                         }
427                         /*
428                          * In any case, increment to the next record.
429                          */
430                         if (!error)
431                                 error = xfs_inobt_increment(cur, 0, &tmp);
432                 } else {
433                         /*
434                          * Start of ag.  Lookup the first inode chunk.
435                          */
436                         error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &tmp);
437                         icount = 0;
438                 }
439                 /*
440                  * Loop through inode btree records in this ag,
441                  * until we run out of inodes or space in the buffer.
442                  */
443                 while (irbp < irbufend && icount < ubcount) {
444                         /*
445                          * Loop as long as we're unable to read the
446                          * inode btree.
447                          */
448                         while (error) {
449                                 agino += XFS_INODES_PER_CHUNK;
450                                 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
451                                                 be32_to_cpu(agi->agi_length))
452                                         break;
453                                 error = xfs_inobt_lookup_ge(cur, agino, 0, 0,
454                                                             &tmp);
455                         }
456                         /*
457                          * If ran off the end of the ag either with an error,
458                          * or the normal way, set end and stop collecting.
459                          */
460                         if (error ||
461                             (error = xfs_inobt_get_rec(cur, &gino, &gcnt,
462                                     &gfree, &i)) ||
463                             i == 0) {
464                                 end_of_ag = 1;
465                                 break;
466                         }
467                         /*
468                          * If this chunk has any allocated inodes, save it.
469                          */
470                         if (gcnt < XFS_INODES_PER_CHUNK) {
471                                 INT_SET(irbp->ir_startino, ARCH_CONVERT, gino);
472                                 INT_SET(irbp->ir_freecount, ARCH_CONVERT, gcnt);
473                                 INT_SET(irbp->ir_free, ARCH_CONVERT, gfree);
474                                 irbp++;
475                                 icount += XFS_INODES_PER_CHUNK - gcnt;
476                         }
477                         /*
478                          * Set agino to after this chunk and bump the cursor.
479                          */
480                         agino = gino + XFS_INODES_PER_CHUNK;
481                         error = xfs_inobt_increment(cur, 0, &tmp);
482                 }
483                 /*
484                  * Drop the btree buffers and the agi buffer.
485                  * We can't hold any of the locks these represent
486                  * when calling iget.
487                  */
488                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
489                 xfs_buf_relse(agbp);
490                 /*
491                  * Now format all the good inodes into the user's buffer.
492                  */
493                 irbufend = irbp;
494                 for (irbp = irbuf;
495                      irbp < irbufend && ubleft >= statstruct_size; irbp++) {
496                         /*
497                          * Read-ahead the next chunk's worth of inodes.
498                          */
499                         if (&irbp[1] < irbufend) {
500                                 /*
501                                  * Loop over all clusters in the next chunk.
502                                  * Do a readahead if there are any allocated
503                                  * inodes in that cluster.
504                                  */
505                                 for (agbno = XFS_AGINO_TO_AGBNO(mp,
506                                                         INT_GET(irbp[1].ir_startino, ARCH_CONVERT)),
507                                      chunkidx = 0;
508                                      chunkidx < XFS_INODES_PER_CHUNK;
509                                      chunkidx += nicluster,
510                                      agbno += nbcluster) {
511                                         if (XFS_INOBT_MASKN(chunkidx,
512                                                             nicluster) &
513                                             ~(INT_GET(irbp[1].ir_free, ARCH_CONVERT)))
514                                                 xfs_btree_reada_bufs(mp, agno,
515                                                         agbno, nbcluster);
516                                 }
517                         }
518                         /*
519                          * Now process this chunk of inodes.
520                          */
521                         for (agino = INT_GET(irbp->ir_startino, ARCH_CONVERT), chunkidx = 0, clustidx = 0;
522                              ubleft > 0 &&
523                                 INT_GET(irbp->ir_freecount, ARCH_CONVERT) < XFS_INODES_PER_CHUNK;
524                              chunkidx++, clustidx++, agino++) {
525                                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
526                                 /*
527                                  * Recompute agbno if this is the
528                                  * first inode of the cluster.
529                                  *
530                                  * Careful with clustidx.   There can be
531                                  * multple clusters per chunk, a single
532                                  * cluster per chunk or a cluster that has
533                                  * inodes represented from several different
534                                  * chunks (if blocksize is large).
535                                  *
536                                  * Because of this, the starting clustidx is
537                                  * initialized to zero in this loop but must
538                                  * later be reset after reading in the cluster
539                                  * buffer.
540                                  */
541                                 if ((chunkidx & (nicluster - 1)) == 0) {
542                                         agbno = XFS_AGINO_TO_AGBNO(mp,
543                                                         INT_GET(irbp->ir_startino, ARCH_CONVERT)) +
544                                                 ((chunkidx & nimask) >>
545                                                  mp->m_sb.sb_inopblog);
546
547                                         if (flags & BULKSTAT_FG_QUICK) {
548                                                 ino = XFS_AGINO_TO_INO(mp, agno,
549                                                                        agino);
550                                                 bno = XFS_AGB_TO_DADDR(mp, agno,
551                                                                        agbno);
552
553                                                 /*
554                                                  * Get the inode cluster buffer
555                                                  */
556                                                 ASSERT(xfs_inode_zone != NULL);
557                                                 ip = kmem_zone_zalloc(xfs_inode_zone,
558                                                                       KM_SLEEP);
559                                                 ip->i_ino = ino;
560                                                 ip->i_mount = mp;
561                                                 if (bp)
562                                                         xfs_buf_relse(bp);
563                                                 error = xfs_itobp(mp, NULL, ip,
564                                                                   &dip, &bp, bno);
565                                                 if (!error)
566                                                         clustidx = ip->i_boffset / mp->m_sb.sb_inodesize;
567                                                 kmem_zone_free(xfs_inode_zone, ip);
568                                                 if (XFS_TEST_ERROR(error != 0,
569                                                                    mp, XFS_ERRTAG_BULKSTAT_READ_CHUNK,
570                                                                    XFS_RANDOM_BULKSTAT_READ_CHUNK)) {
571                                                         bp = NULL;
572                                                         break;
573                                                 }
574                                         }
575                                 }
576                                 /*
577                                  * Skip if this inode is free.
578                                  */
579                                 if (XFS_INOBT_MASK(chunkidx) & INT_GET(irbp->ir_free, ARCH_CONVERT))
580                                         continue;
581                                 /*
582                                  * Count used inodes as free so we can tell
583                                  * when the chunk is used up.
584                                  */
585                                 INT_MOD(irbp->ir_freecount, ARCH_CONVERT, +1);
586                                 ino = XFS_AGINO_TO_INO(mp, agno, agino);
587                                 bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
588                                 if (flags & BULKSTAT_FG_QUICK) {
589                                         dip = (xfs_dinode_t *)xfs_buf_offset(bp,
590                                               (clustidx << mp->m_sb.sb_inodelog));
591
592                                         if (INT_GET(dip->di_core.di_magic, ARCH_CONVERT)
593                                                     != XFS_DINODE_MAGIC
594                                             || !XFS_DINODE_GOOD_VERSION(
595                                                     INT_GET(dip->di_core.di_version, ARCH_CONVERT)))
596                                                 continue;
597                                 }
598
599                                 /*
600                                  * Get the inode and fill in a single buffer.
601                                  * BULKSTAT_FG_QUICK uses dip to fill it in.
602                                  * BULKSTAT_FG_IGET uses igets.
603                                  * See: xfs_bulkstat_one & xfs_dm_bulkstat_one.
604                                  * This is also used to count inodes/blks, etc
605                                  * in xfs_qm_quotacheck.
606                                  */
607                                 ubused = statstruct_size;
608                                 error = formatter(mp, ino, ubufp,
609                                                 ubleft, private_data,
610                                                 bno, &ubused, dip, &fmterror);
611                                 if (fmterror == BULKSTAT_RV_NOTHING) {
612                                         if (error == ENOMEM)
613                                                 ubleft = 0;
614                                         continue;
615                                 }
616                                 if (fmterror == BULKSTAT_RV_GIVEUP) {
617                                         ubleft = 0;
618                                         ASSERT(error);
619                                         rval = error;
620                                         break;
621                                 }
622                                 if (ubufp)
623                                         ubufp += ubused;
624                                 ubleft -= ubused;
625                                 ubelem++;
626                                 lastino = ino;
627                         }
628                 }
629
630                 if (bp)
631                         xfs_buf_relse(bp);
632
633                 /*
634                  * Set up for the next loop iteration.
635                  */
636                 if (ubleft > 0) {
637                         if (end_of_ag) {
638                                 agno++;
639                                 agino = 0;
640                         } else
641                                 agino = XFS_INO_TO_AGINO(mp, lastino);
642                 } else
643                         break;
644         }
645         /*
646          * Done, we're either out of filesystem or space to put the data.
647          */
648         kmem_free(irbuf, NBPC);
649         if (ubuffer)
650                 unuseracc(ubuffer, ubcount * statstruct_size, (B_READ|B_PHYS));
651         *ubcountp = ubelem;
652         if (agno >= mp->m_sb.sb_agcount) {
653                 /*
654                  * If we ran out of filesystem, mark lastino as off
655                  * the end of the filesystem, so the next call
656                  * will return immediately.
657                  */
658                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
659                 *done = 1;
660         } else
661                 *lastinop = (xfs_ino_t)lastino;
662
663         return rval;
664 }
665
666 /*
667  * Return stat information in bulk (by-inode) for the filesystem.
668  * Special case for non-sequential one inode bulkstat.
669  */
670 int                                     /* error status */
671 xfs_bulkstat_single(
672         xfs_mount_t             *mp,    /* mount point for filesystem */
673         xfs_ino_t               *lastinop, /* inode to return */
674         char                    __user *buffer, /* buffer with inode stats */
675         int                     *done)  /* 1 if there're more stats to get */
676 {
677         int                     count;  /* count value for bulkstat call */
678         int                     error;  /* return value */
679         xfs_ino_t               ino;    /* filesystem inode number */
680         int                     res;    /* result from bs1 */
681
682         /*
683          * note that requesting valid inode numbers which are not allocated
684          * to inodes will most likely cause xfs_itobp to generate warning
685          * messages about bad magic numbers. This is ok. The fact that
686          * the inode isn't actually an inode is handled by the
687          * error check below. Done this way to make the usual case faster
688          * at the expense of the error case.
689          */
690
691         ino = (xfs_ino_t)*lastinop;
692         error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t),
693                                  NULL, 0, NULL, NULL, &res);
694         if (error) {
695                 /*
696                  * Special case way failed, do it the "long" way
697                  * to see if that works.
698                  */
699                 (*lastinop)--;
700                 count = 1;
701                 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
702                                 NULL, sizeof(xfs_bstat_t), buffer,
703                                 BULKSTAT_FG_IGET, done))
704                         return error;
705                 if (count == 0 || (xfs_ino_t)*lastinop != ino)
706                         return error == EFSCORRUPTED ?
707                                 XFS_ERROR(EINVAL) : error;
708                 else
709                         return 0;
710         }
711         *done = 0;
712         return 0;
713 }
714
715 /*
716  * Return inode number table for the filesystem.
717  */
718 int                                     /* error status */
719 xfs_inumbers(
720         xfs_mount_t     *mp,            /* mount point for filesystem */
721         xfs_ino_t       *lastino,       /* last inode returned */
722         int             *count,         /* size of buffer/count returned */
723         xfs_inogrp_t    __user *ubuffer)/* buffer with inode descriptions */
724 {
725         xfs_buf_t       *agbp;
726         xfs_agino_t     agino;
727         xfs_agnumber_t  agno;
728         int             bcount;
729         xfs_inogrp_t    *buffer;
730         int             bufidx;
731         xfs_btree_cur_t *cur;
732         int             error;
733         __int32_t       gcnt;
734         xfs_inofree_t   gfree;
735         xfs_agino_t     gino;
736         int             i;
737         xfs_ino_t       ino;
738         int             left;
739         int             tmp;
740
741         ino = (xfs_ino_t)*lastino;
742         agno = XFS_INO_TO_AGNO(mp, ino);
743         agino = XFS_INO_TO_AGINO(mp, ino);
744         left = *count;
745         *count = 0;
746         bcount = MIN(left, (int)(NBPP / sizeof(*buffer)));
747         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
748         error = bufidx = 0;
749         cur = NULL;
750         agbp = NULL;
751         while (left > 0 && agno < mp->m_sb.sb_agcount) {
752                 if (agbp == NULL) {
753                         down_read(&mp->m_peraglock);
754                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
755                         up_read(&mp->m_peraglock);
756                         if (error) {
757                                 /*
758                                  * If we can't read the AGI of this ag,
759                                  * then just skip to the next one.
760                                  */
761                                 ASSERT(cur == NULL);
762                                 agbp = NULL;
763                                 agno++;
764                                 agino = 0;
765                                 continue;
766                         }
767                         cur = xfs_btree_init_cursor(mp, NULL, agbp, agno,
768                                 XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
769                         error = xfs_inobt_lookup_ge(cur, agino, 0, 0, &tmp);
770                         if (error) {
771                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
772                                 cur = NULL;
773                                 xfs_buf_relse(agbp);
774                                 agbp = NULL;
775                                 /*
776                                  * Move up the the last inode in the current
777                                  * chunk.  The lookup_ge will always get
778                                  * us the first inode in the next chunk.
779                                  */
780                                 agino += XFS_INODES_PER_CHUNK - 1;
781                                 continue;
782                         }
783                 }
784                 if ((error = xfs_inobt_get_rec(cur, &gino, &gcnt, &gfree,
785                         &i)) ||
786                     i == 0) {
787                         xfs_buf_relse(agbp);
788                         agbp = NULL;
789                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
790                         cur = NULL;
791                         agno++;
792                         agino = 0;
793                         continue;
794                 }
795                 agino = gino + XFS_INODES_PER_CHUNK - 1;
796                 buffer[bufidx].xi_startino = XFS_AGINO_TO_INO(mp, agno, gino);
797                 buffer[bufidx].xi_alloccount = XFS_INODES_PER_CHUNK - gcnt;
798                 buffer[bufidx].xi_allocmask = ~gfree;
799                 bufidx++;
800                 left--;
801                 if (bufidx == bcount) {
802                         if (copy_to_user(ubuffer, buffer,
803                                         bufidx * sizeof(*buffer))) {
804                                 error = XFS_ERROR(EFAULT);
805                                 break;
806                         }
807                         ubuffer += bufidx;
808                         *count += bufidx;
809                         bufidx = 0;
810                 }
811                 if (left) {
812                         error = xfs_inobt_increment(cur, 0, &tmp);
813                         if (error) {
814                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
815                                 cur = NULL;
816                                 xfs_buf_relse(agbp);
817                                 agbp = NULL;
818                                 /*
819                                  * The agino value has already been bumped.
820                                  * Just try to skip up to it.
821                                  */
822                                 agino += XFS_INODES_PER_CHUNK;
823                                 continue;
824                         }
825                 }
826         }
827         if (!error) {
828                 if (bufidx) {
829                         if (copy_to_user(ubuffer, buffer,
830                                         bufidx * sizeof(*buffer)))
831                                 error = XFS_ERROR(EFAULT);
832                         else
833                                 *count += bufidx;
834                 }
835                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
836         }
837         kmem_free(buffer, bcount * sizeof(*buffer));
838         if (cur)
839                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
840                                            XFS_BTREE_NOERROR));
841         if (agbp)
842                 xfs_buf_relse(agbp);
843         return error;
844 }