Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband
[linux-2.6] / fs / xfs / xfs_fsops.c
1 /*
2  * Copyright (c) 2000-2005 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_inum.h"
23 #include "xfs_log.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_inode_item.h"
40 #include "xfs_btree.h"
41 #include "xfs_error.h"
42 #include "xfs_alloc.h"
43 #include "xfs_ialloc.h"
44 #include "xfs_fsops.h"
45 #include "xfs_itable.h"
46 #include "xfs_trans_space.h"
47 #include "xfs_rtalloc.h"
48 #include "xfs_rw.h"
49
50 /*
51  * File system operations
52  */
53
54 int
55 xfs_fs_geometry(
56         xfs_mount_t             *mp,
57         xfs_fsop_geom_t         *geo,
58         int                     new_version)
59 {
60         geo->blocksize = mp->m_sb.sb_blocksize;
61         geo->rtextsize = mp->m_sb.sb_rextsize;
62         geo->agblocks = mp->m_sb.sb_agblocks;
63         geo->agcount = mp->m_sb.sb_agcount;
64         geo->logblocks = mp->m_sb.sb_logblocks;
65         geo->sectsize = mp->m_sb.sb_sectsize;
66         geo->inodesize = mp->m_sb.sb_inodesize;
67         geo->imaxpct = mp->m_sb.sb_imax_pct;
68         geo->datablocks = mp->m_sb.sb_dblocks;
69         geo->rtblocks = mp->m_sb.sb_rblocks;
70         geo->rtextents = mp->m_sb.sb_rextents;
71         geo->logstart = mp->m_sb.sb_logstart;
72         ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
73         memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
74         if (new_version >= 2) {
75                 geo->sunit = mp->m_sb.sb_unit;
76                 geo->swidth = mp->m_sb.sb_width;
77         }
78         if (new_version >= 3) {
79                 geo->version = XFS_FSOP_GEOM_VERSION;
80                 geo->flags =
81                         (XFS_SB_VERSION_HASATTR(&mp->m_sb) ?
82                                 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
83                         (XFS_SB_VERSION_HASNLINK(&mp->m_sb) ?
84                                 XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
85                         (XFS_SB_VERSION_HASQUOTA(&mp->m_sb) ?
86                                 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
87                         (XFS_SB_VERSION_HASALIGN(&mp->m_sb) ?
88                                 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
89                         (XFS_SB_VERSION_HASDALIGN(&mp->m_sb) ?
90                                 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
91                         (XFS_SB_VERSION_HASSHARED(&mp->m_sb) ?
92                                 XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
93                         (XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb) ?
94                                 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
95                         (XFS_SB_VERSION_HASDIRV2(&mp->m_sb) ?
96                                 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
97                         (XFS_SB_VERSION_HASSECTOR(&mp->m_sb) ?
98                                 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
99                         (XFS_SB_VERSION_HASATTR2(&mp->m_sb) ?
100                                 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0);
101                 geo->logsectsize = XFS_SB_VERSION_HASSECTOR(&mp->m_sb) ?
102                                 mp->m_sb.sb_logsectsize : BBSIZE;
103                 geo->rtsectsize = mp->m_sb.sb_blocksize;
104                 geo->dirblocksize = mp->m_dirblksize;
105         }
106         if (new_version >= 4) {
107                 geo->flags |=
108                         (XFS_SB_VERSION_HASLOGV2(&mp->m_sb) ?
109                                 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
110                 geo->logsunit = mp->m_sb.sb_logsunit;
111         }
112         return 0;
113 }
114
115 static int
116 xfs_growfs_data_private(
117         xfs_mount_t             *mp,            /* mount point for filesystem */
118         xfs_growfs_data_t       *in)            /* growfs data input struct */
119 {
120         xfs_agf_t               *agf;
121         xfs_agi_t               *agi;
122         xfs_agnumber_t          agno;
123         xfs_extlen_t            agsize;
124         xfs_extlen_t            tmpsize;
125         xfs_alloc_rec_t         *arec;
126         xfs_btree_sblock_t      *block;
127         xfs_buf_t               *bp;
128         int                     bucket;
129         int                     dpct;
130         int                     error;
131         xfs_agnumber_t          nagcount;
132         xfs_agnumber_t          nagimax = 0;
133         xfs_rfsblock_t          nb, nb_mod;
134         xfs_rfsblock_t          new;
135         xfs_rfsblock_t          nfree;
136         xfs_agnumber_t          oagcount;
137         int                     pct;
138         xfs_sb_t                *sbp;
139         xfs_trans_t             *tp;
140
141         nb = in->newblocks;
142         pct = in->imaxpct;
143         if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
144                 return XFS_ERROR(EINVAL);
145         dpct = pct - mp->m_sb.sb_imax_pct;
146         error = xfs_read_buf(mp, mp->m_ddev_targp,
147                         XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
148                         XFS_FSS_TO_BB(mp, 1), 0, &bp);
149         if (error)
150                 return error;
151         ASSERT(bp);
152         xfs_buf_relse(bp);
153
154         new = nb;       /* use new as a temporary here */
155         nb_mod = do_div(new, mp->m_sb.sb_agblocks);
156         nagcount = new + (nb_mod != 0);
157         if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
158                 nagcount--;
159                 nb = nagcount * mp->m_sb.sb_agblocks;
160                 if (nb < mp->m_sb.sb_dblocks)
161                         return XFS_ERROR(EINVAL);
162         }
163         new = nb - mp->m_sb.sb_dblocks;
164         oagcount = mp->m_sb.sb_agcount;
165         if (nagcount > oagcount) {
166                 down_write(&mp->m_peraglock);
167                 mp->m_perag = kmem_realloc(mp->m_perag,
168                         sizeof(xfs_perag_t) * nagcount,
169                         sizeof(xfs_perag_t) * oagcount,
170                         KM_SLEEP);
171                 memset(&mp->m_perag[oagcount], 0,
172                         (nagcount - oagcount) * sizeof(xfs_perag_t));
173                 mp->m_flags |= XFS_MOUNT_32BITINODES;
174                 nagimax = xfs_initialize_perag(XFS_MTOVFS(mp), mp, nagcount);
175                 up_write(&mp->m_peraglock);
176         }
177         tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
178         if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
179                         XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
180                 xfs_trans_cancel(tp, 0);
181                 return error;
182         }
183
184         nfree = 0;
185         for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
186                 /*
187                  * AG freelist header block
188                  */
189                 bp = xfs_buf_get(mp->m_ddev_targp,
190                                   XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
191                                   XFS_FSS_TO_BB(mp, 1), 0);
192                 agf = XFS_BUF_TO_AGF(bp);
193                 memset(agf, 0, mp->m_sb.sb_sectsize);
194                 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
195                 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
196                 agf->agf_seqno = cpu_to_be32(agno);
197                 if (agno == nagcount - 1)
198                         agsize =
199                                 nb -
200                                 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
201                 else
202                         agsize = mp->m_sb.sb_agblocks;
203                 agf->agf_length = cpu_to_be32(agsize);
204                 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
205                 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
206                 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
207                 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
208                 agf->agf_flfirst = 0;
209                 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
210                 agf->agf_flcount = 0;
211                 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
212                 agf->agf_freeblks = cpu_to_be32(tmpsize);
213                 agf->agf_longest = cpu_to_be32(tmpsize);
214                 error = xfs_bwrite(mp, bp);
215                 if (error) {
216                         goto error0;
217                 }
218                 /*
219                  * AG inode header block
220                  */
221                 bp = xfs_buf_get(mp->m_ddev_targp,
222                                   XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
223                                   XFS_FSS_TO_BB(mp, 1), 0);
224                 agi = XFS_BUF_TO_AGI(bp);
225                 memset(agi, 0, mp->m_sb.sb_sectsize);
226                 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
227                 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
228                 agi->agi_seqno = cpu_to_be32(agno);
229                 agi->agi_length = cpu_to_be32(agsize);
230                 agi->agi_count = 0;
231                 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
232                 agi->agi_level = cpu_to_be32(1);
233                 agi->agi_freecount = 0;
234                 agi->agi_newino = cpu_to_be32(NULLAGINO);
235                 agi->agi_dirino = cpu_to_be32(NULLAGINO);
236                 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
237                         agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
238                 error = xfs_bwrite(mp, bp);
239                 if (error) {
240                         goto error0;
241                 }
242                 /*
243                  * BNO btree root block
244                  */
245                 bp = xfs_buf_get(mp->m_ddev_targp,
246                         XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
247                         BTOBB(mp->m_sb.sb_blocksize), 0);
248                 block = XFS_BUF_TO_SBLOCK(bp);
249                 memset(block, 0, mp->m_sb.sb_blocksize);
250                 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC);
251                 block->bb_level = 0;
252                 block->bb_numrecs = cpu_to_be16(1);
253                 block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
254                 block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
255                 arec = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_alloc,
256                         block, 1, mp->m_alloc_mxr[0]);
257                 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
258                 arec->ar_blockcount = cpu_to_be32(
259                         agsize - be32_to_cpu(arec->ar_startblock));
260                 error = xfs_bwrite(mp, bp);
261                 if (error) {
262                         goto error0;
263                 }
264                 /*
265                  * CNT btree root block
266                  */
267                 bp = xfs_buf_get(mp->m_ddev_targp,
268                         XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
269                         BTOBB(mp->m_sb.sb_blocksize), 0);
270                 block = XFS_BUF_TO_SBLOCK(bp);
271                 memset(block, 0, mp->m_sb.sb_blocksize);
272                 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
273                 block->bb_level = 0;
274                 block->bb_numrecs = cpu_to_be16(1);
275                 block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
276                 block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
277                 arec = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_alloc,
278                         block, 1, mp->m_alloc_mxr[0]);
279                 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
280                 arec->ar_blockcount = cpu_to_be32(
281                         agsize - be32_to_cpu(arec->ar_startblock));
282                 nfree += be32_to_cpu(arec->ar_blockcount);
283                 error = xfs_bwrite(mp, bp);
284                 if (error) {
285                         goto error0;
286                 }
287                 /*
288                  * INO btree root block
289                  */
290                 bp = xfs_buf_get(mp->m_ddev_targp,
291                         XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
292                         BTOBB(mp->m_sb.sb_blocksize), 0);
293                 block = XFS_BUF_TO_SBLOCK(bp);
294                 memset(block, 0, mp->m_sb.sb_blocksize);
295                 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC);
296                 block->bb_level = 0;
297                 block->bb_numrecs = 0;
298                 block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
299                 block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
300                 error = xfs_bwrite(mp, bp);
301                 if (error) {
302                         goto error0;
303                 }
304         }
305         xfs_trans_agblocks_delta(tp, nfree);
306         /*
307          * There are new blocks in the old last a.g.
308          */
309         if (new) {
310                 /*
311                  * Change the agi length.
312                  */
313                 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
314                 if (error) {
315                         goto error0;
316                 }
317                 ASSERT(bp);
318                 agi = XFS_BUF_TO_AGI(bp);
319                 be32_add(&agi->agi_length, new);
320                 ASSERT(nagcount == oagcount ||
321                        be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
322                 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
323                 /*
324                  * Change agf length.
325                  */
326                 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
327                 if (error) {
328                         goto error0;
329                 }
330                 ASSERT(bp);
331                 agf = XFS_BUF_TO_AGF(bp);
332                 be32_add(&agf->agf_length, new);
333                 ASSERT(be32_to_cpu(agf->agf_length) ==
334                        be32_to_cpu(agi->agi_length));
335                 /*
336                  * Free the new space.
337                  */
338                 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
339                         be32_to_cpu(agf->agf_length) - new), new);
340                 if (error) {
341                         goto error0;
342                 }
343         }
344         if (nagcount > oagcount)
345                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
346         if (nb > mp->m_sb.sb_dblocks)
347                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
348                                  nb - mp->m_sb.sb_dblocks);
349         if (nfree)
350                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
351         if (dpct)
352                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
353         error = xfs_trans_commit(tp, 0, NULL);
354         if (error) {
355                 return error;
356         }
357         /* New allocation groups fully initialized, so update mount struct */
358         if (nagimax)
359                 mp->m_maxagi = nagimax;
360         if (mp->m_sb.sb_imax_pct) {
361                 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
362                 do_div(icount, 100);
363                 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
364         } else
365                 mp->m_maxicount = 0;
366         for (agno = 1; agno < nagcount; agno++) {
367                 error = xfs_read_buf(mp, mp->m_ddev_targp,
368                                   XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
369                                   XFS_FSS_TO_BB(mp, 1), 0, &bp);
370                 if (error) {
371                         xfs_fs_cmn_err(CE_WARN, mp,
372                         "error %d reading secondary superblock for ag %d",
373                                 error, agno);
374                         break;
375                 }
376                 sbp = XFS_BUF_TO_SBP(bp);
377                 xfs_xlatesb(sbp, &mp->m_sb, -1, XFS_SB_ALL_BITS);
378                 /*
379                  * If we get an error writing out the alternate superblocks,
380                  * just issue a warning and continue.  The real work is
381                  * already done and committed.
382                  */
383                 if (!(error = xfs_bwrite(mp, bp))) {
384                         continue;
385                 } else {
386                         xfs_fs_cmn_err(CE_WARN, mp,
387                 "write error %d updating secondary superblock for ag %d",
388                                 error, agno);
389                         break; /* no point in continuing */
390                 }
391         }
392         return 0;
393
394  error0:
395         xfs_trans_cancel(tp, XFS_TRANS_ABORT);
396         return error;
397 }
398
399 static int
400 xfs_growfs_log_private(
401         xfs_mount_t             *mp,    /* mount point for filesystem */
402         xfs_growfs_log_t        *in)    /* growfs log input struct */
403 {
404         xfs_extlen_t            nb;
405
406         nb = in->newblocks;
407         if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
408                 return XFS_ERROR(EINVAL);
409         if (nb == mp->m_sb.sb_logblocks &&
410             in->isint == (mp->m_sb.sb_logstart != 0))
411                 return XFS_ERROR(EINVAL);
412         /*
413          * Moving the log is hard, need new interfaces to sync
414          * the log first, hold off all activity while moving it.
415          * Can have shorter or longer log in the same space,
416          * or transform internal to external log or vice versa.
417          */
418         return XFS_ERROR(ENOSYS);
419 }
420
421 /*
422  * protected versions of growfs function acquire and release locks on the mount
423  * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
424  * XFS_IOC_FSGROWFSRT
425  */
426
427
428 int
429 xfs_growfs_data(
430         xfs_mount_t             *mp,
431         xfs_growfs_data_t       *in)
432 {
433         int error;
434         if (!cpsema(&mp->m_growlock))
435                 return XFS_ERROR(EWOULDBLOCK);
436         error = xfs_growfs_data_private(mp, in);
437         vsema(&mp->m_growlock);
438         return error;
439 }
440
441 int
442 xfs_growfs_log(
443         xfs_mount_t             *mp,
444         xfs_growfs_log_t        *in)
445 {
446         int error;
447         if (!cpsema(&mp->m_growlock))
448                 return XFS_ERROR(EWOULDBLOCK);
449         error = xfs_growfs_log_private(mp, in);
450         vsema(&mp->m_growlock);
451         return error;
452 }
453
454 /*
455  * exported through ioctl XFS_IOC_FSCOUNTS
456  */
457
458 int
459 xfs_fs_counts(
460         xfs_mount_t             *mp,
461         xfs_fsop_counts_t       *cnt)
462 {
463         unsigned long   s;
464
465         s = XFS_SB_LOCK(mp);
466         cnt->freedata = mp->m_sb.sb_fdblocks;
467         cnt->freertx = mp->m_sb.sb_frextents;
468         cnt->freeino = mp->m_sb.sb_ifree;
469         cnt->allocino = mp->m_sb.sb_icount;
470         XFS_SB_UNLOCK(mp, s);
471         return 0;
472 }
473
474 /*
475  * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
476  *
477  * xfs_reserve_blocks is called to set m_resblks
478  * in the in-core mount table. The number of unused reserved blocks
479  * is kept in m_resbls_avail.
480  *
481  * Reserve the requested number of blocks if available. Otherwise return
482  * as many as possible to satisfy the request. The actual number
483  * reserved are returned in outval
484  *
485  * A null inval pointer indicates that only the current reserved blocks
486  * available  should  be returned no settings are changed.
487  */
488
489 int
490 xfs_reserve_blocks(
491         xfs_mount_t             *mp,
492         __uint64_t              *inval,
493         xfs_fsop_resblks_t      *outval)
494 {
495         __int64_t               lcounter, delta;
496         __uint64_t              request;
497         unsigned long           s;
498
499         /* If inval is null, report current values and return */
500
501         if (inval == (__uint64_t *)NULL) {
502                 outval->resblks = mp->m_resblks;
503                 outval->resblks_avail = mp->m_resblks_avail;
504                 return(0);
505         }
506
507         request = *inval;
508         s = XFS_SB_LOCK(mp);
509
510         /*
511          * If our previous reservation was larger than the current value,
512          * then move any unused blocks back to the free pool.
513          */
514
515         if (mp->m_resblks > request) {
516                 lcounter = mp->m_resblks_avail - request;
517                 if (lcounter  > 0) {            /* release unused blocks */
518                         mp->m_sb.sb_fdblocks += lcounter;
519                         mp->m_resblks_avail -= lcounter;
520                 }
521                 mp->m_resblks = request;
522         } else {
523                 delta = request - mp->m_resblks;
524                 lcounter = mp->m_sb.sb_fdblocks - delta;
525                 if (lcounter < 0) {
526                         /* We can't satisfy the request, just get what we can */
527                         mp->m_resblks += mp->m_sb.sb_fdblocks;
528                         mp->m_resblks_avail += mp->m_sb.sb_fdblocks;
529                         mp->m_sb.sb_fdblocks = 0;
530                 } else {
531                         mp->m_sb.sb_fdblocks = lcounter;
532                         mp->m_resblks = request;
533                         mp->m_resblks_avail += delta;
534                 }
535         }
536
537         outval->resblks = mp->m_resblks;
538         outval->resblks_avail = mp->m_resblks_avail;
539         XFS_SB_UNLOCK(mp, s);
540         return(0);
541 }
542
543 void
544 xfs_fs_log_dummy(xfs_mount_t *mp)
545 {
546         xfs_trans_t *tp;
547         xfs_inode_t *ip;
548
549
550         tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
551         atomic_inc(&mp->m_active_trans);
552         if (xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0)) {
553                 xfs_trans_cancel(tp, 0);
554                 return;
555         }
556
557         ip = mp->m_rootip;
558         xfs_ilock(ip, XFS_ILOCK_EXCL);
559
560         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
561         xfs_trans_ihold(tp, ip);
562         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
563         xfs_trans_set_sync(tp);
564         xfs_trans_commit(tp, 0, NULL);
565
566         xfs_iunlock(ip, XFS_ILOCK_EXCL);
567 }
568
569 int
570 xfs_fs_goingdown(
571         xfs_mount_t     *mp,
572         __uint32_t      inflags)
573 {
574         switch (inflags) {
575         case XFS_FSOP_GOING_FLAGS_DEFAULT: {
576                 struct vfs *vfsp = XFS_MTOVFS(mp);
577                 struct super_block *sb = freeze_bdev(vfsp->vfs_super->s_bdev);
578
579                 if (sb && !IS_ERR(sb)) {
580                         xfs_force_shutdown(mp, XFS_FORCE_UMOUNT);
581                         thaw_bdev(sb->s_bdev, sb);
582                 }
583         
584                 break;
585         }
586         case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
587                 xfs_force_shutdown(mp, XFS_FORCE_UMOUNT);
588                 break;
589         case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
590                 xfs_force_shutdown(mp, XFS_FORCE_UMOUNT|XFS_LOG_IO_ERROR);
591                 break;
592         default:
593                 return XFS_ERROR(EINVAL);
594         }
595
596         return 0;
597 }