[PATCH] Require mmap handler for a.out executables
[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_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_inode_item.h"
38 #include "xfs_btree.h"
39 #include "xfs_error.h"
40 #include "xfs_alloc.h"
41 #include "xfs_ialloc.h"
42 #include "xfs_fsops.h"
43 #include "xfs_itable.h"
44 #include "xfs_trans_space.h"
45 #include "xfs_rtalloc.h"
46 #include "xfs_rw.h"
47
48 /*
49  * File system operations
50  */
51
52 int
53 xfs_fs_geometry(
54         xfs_mount_t             *mp,
55         xfs_fsop_geom_t         *geo,
56         int                     new_version)
57 {
58         geo->blocksize = mp->m_sb.sb_blocksize;
59         geo->rtextsize = mp->m_sb.sb_rextsize;
60         geo->agblocks = mp->m_sb.sb_agblocks;
61         geo->agcount = mp->m_sb.sb_agcount;
62         geo->logblocks = mp->m_sb.sb_logblocks;
63         geo->sectsize = mp->m_sb.sb_sectsize;
64         geo->inodesize = mp->m_sb.sb_inodesize;
65         geo->imaxpct = mp->m_sb.sb_imax_pct;
66         geo->datablocks = mp->m_sb.sb_dblocks;
67         geo->rtblocks = mp->m_sb.sb_rblocks;
68         geo->rtextents = mp->m_sb.sb_rextents;
69         geo->logstart = mp->m_sb.sb_logstart;
70         ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
71         memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
72         if (new_version >= 2) {
73                 geo->sunit = mp->m_sb.sb_unit;
74                 geo->swidth = mp->m_sb.sb_width;
75         }
76         if (new_version >= 3) {
77                 geo->version = XFS_FSOP_GEOM_VERSION;
78                 geo->flags =
79                         (XFS_SB_VERSION_HASATTR(&mp->m_sb) ?
80                                 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
81                         (XFS_SB_VERSION_HASNLINK(&mp->m_sb) ?
82                                 XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
83                         (XFS_SB_VERSION_HASQUOTA(&mp->m_sb) ?
84                                 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
85                         (XFS_SB_VERSION_HASALIGN(&mp->m_sb) ?
86                                 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
87                         (XFS_SB_VERSION_HASDALIGN(&mp->m_sb) ?
88                                 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
89                         (XFS_SB_VERSION_HASSHARED(&mp->m_sb) ?
90                                 XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
91                         (XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb) ?
92                                 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
93                         (XFS_SB_VERSION_HASDIRV2(&mp->m_sb) ?
94                                 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
95                         (XFS_SB_VERSION_HASSECTOR(&mp->m_sb) ?
96                                 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
97                         (XFS_SB_VERSION_HASATTR2(&mp->m_sb) ?
98                                 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0);
99                 geo->logsectsize = XFS_SB_VERSION_HASSECTOR(&mp->m_sb) ?
100                                 mp->m_sb.sb_logsectsize : BBSIZE;
101                 geo->rtsectsize = mp->m_sb.sb_blocksize;
102                 geo->dirblocksize = mp->m_dirblksize;
103         }
104         if (new_version >= 4) {
105                 geo->flags |=
106                         (XFS_SB_VERSION_HASLOGV2(&mp->m_sb) ?
107                                 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
108                 geo->logsunit = mp->m_sb.sb_logsunit;
109         }
110         return 0;
111 }
112
113 static int
114 xfs_growfs_data_private(
115         xfs_mount_t             *mp,            /* mount point for filesystem */
116         xfs_growfs_data_t       *in)            /* growfs data input struct */
117 {
118         xfs_agf_t               *agf;
119         xfs_agi_t               *agi;
120         xfs_agnumber_t          agno;
121         xfs_extlen_t            agsize;
122         xfs_extlen_t            tmpsize;
123         xfs_alloc_rec_t         *arec;
124         xfs_btree_sblock_t      *block;
125         xfs_buf_t               *bp;
126         int                     bucket;
127         int                     dpct;
128         int                     error;
129         xfs_agnumber_t          nagcount;
130         xfs_agnumber_t          nagimax = 0;
131         xfs_rfsblock_t          nb, nb_mod;
132         xfs_rfsblock_t          new;
133         xfs_rfsblock_t          nfree;
134         xfs_agnumber_t          oagcount;
135         int                     pct;
136         xfs_sb_t                *sbp;
137         xfs_trans_t             *tp;
138
139         nb = in->newblocks;
140         pct = in->imaxpct;
141         if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
142                 return XFS_ERROR(EINVAL);
143         dpct = pct - mp->m_sb.sb_imax_pct;
144         error = xfs_read_buf(mp, mp->m_ddev_targp,
145                         XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
146                         XFS_FSS_TO_BB(mp, 1), 0, &bp);
147         if (error)
148                 return error;
149         ASSERT(bp);
150         xfs_buf_relse(bp);
151
152         new = nb;       /* use new as a temporary here */
153         nb_mod = do_div(new, mp->m_sb.sb_agblocks);
154         nagcount = new + (nb_mod != 0);
155         if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
156                 nagcount--;
157                 nb = nagcount * mp->m_sb.sb_agblocks;
158                 if (nb < mp->m_sb.sb_dblocks)
159                         return XFS_ERROR(EINVAL);
160         }
161         new = nb - mp->m_sb.sb_dblocks;
162         oagcount = mp->m_sb.sb_agcount;
163         if (nagcount > oagcount) {
164                 down_write(&mp->m_peraglock);
165                 mp->m_perag = kmem_realloc(mp->m_perag,
166                         sizeof(xfs_perag_t) * nagcount,
167                         sizeof(xfs_perag_t) * oagcount,
168                         KM_SLEEP);
169                 memset(&mp->m_perag[oagcount], 0,
170                         (nagcount - oagcount) * sizeof(xfs_perag_t));
171                 mp->m_flags |= XFS_MOUNT_32BITINODES;
172                 nagimax = xfs_initialize_perag(XFS_MTOVFS(mp), mp, nagcount);
173                 up_write(&mp->m_peraglock);
174         }
175         tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
176         if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
177                         XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
178                 xfs_trans_cancel(tp, 0);
179                 return error;
180         }
181
182         nfree = 0;
183         for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
184                 /*
185                  * AG freelist header block
186                  */
187                 bp = xfs_buf_get(mp->m_ddev_targp,
188                                   XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
189                                   XFS_FSS_TO_BB(mp, 1), 0);
190                 agf = XFS_BUF_TO_AGF(bp);
191                 memset(agf, 0, mp->m_sb.sb_sectsize);
192                 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
193                 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
194                 agf->agf_seqno = cpu_to_be32(agno);
195                 if (agno == nagcount - 1)
196                         agsize =
197                                 nb -
198                                 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
199                 else
200                         agsize = mp->m_sb.sb_agblocks;
201                 agf->agf_length = cpu_to_be32(agsize);
202                 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
203                 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
204                 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
205                 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
206                 agf->agf_flfirst = 0;
207                 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
208                 agf->agf_flcount = 0;
209                 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
210                 agf->agf_freeblks = cpu_to_be32(tmpsize);
211                 agf->agf_longest = cpu_to_be32(tmpsize);
212                 error = xfs_bwrite(mp, bp);
213                 if (error) {
214                         goto error0;
215                 }
216                 /*
217                  * AG inode header block
218                  */
219                 bp = xfs_buf_get(mp->m_ddev_targp,
220                                   XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
221                                   XFS_FSS_TO_BB(mp, 1), 0);
222                 agi = XFS_BUF_TO_AGI(bp);
223                 memset(agi, 0, mp->m_sb.sb_sectsize);
224                 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
225                 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
226                 agi->agi_seqno = cpu_to_be32(agno);
227                 agi->agi_length = cpu_to_be32(agsize);
228                 agi->agi_count = 0;
229                 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
230                 agi->agi_level = cpu_to_be32(1);
231                 agi->agi_freecount = 0;
232                 agi->agi_newino = cpu_to_be32(NULLAGINO);
233                 agi->agi_dirino = cpu_to_be32(NULLAGINO);
234                 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
235                         agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
236                 error = xfs_bwrite(mp, bp);
237                 if (error) {
238                         goto error0;
239                 }
240                 /*
241                  * BNO btree root block
242                  */
243                 bp = xfs_buf_get(mp->m_ddev_targp,
244                         XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
245                         BTOBB(mp->m_sb.sb_blocksize), 0);
246                 block = XFS_BUF_TO_SBLOCK(bp);
247                 memset(block, 0, mp->m_sb.sb_blocksize);
248                 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC);
249                 block->bb_level = 0;
250                 block->bb_numrecs = cpu_to_be16(1);
251                 block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
252                 block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
253                 arec = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_alloc,
254                         block, 1, mp->m_alloc_mxr[0]);
255                 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
256                 arec->ar_blockcount = cpu_to_be32(
257                         agsize - be32_to_cpu(arec->ar_startblock));
258                 error = xfs_bwrite(mp, bp);
259                 if (error) {
260                         goto error0;
261                 }
262                 /*
263                  * CNT btree root block
264                  */
265                 bp = xfs_buf_get(mp->m_ddev_targp,
266                         XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
267                         BTOBB(mp->m_sb.sb_blocksize), 0);
268                 block = XFS_BUF_TO_SBLOCK(bp);
269                 memset(block, 0, mp->m_sb.sb_blocksize);
270                 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
271                 block->bb_level = 0;
272                 block->bb_numrecs = cpu_to_be16(1);
273                 block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
274                 block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
275                 arec = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_alloc,
276                         block, 1, mp->m_alloc_mxr[0]);
277                 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
278                 arec->ar_blockcount = cpu_to_be32(
279                         agsize - be32_to_cpu(arec->ar_startblock));
280                 nfree += be32_to_cpu(arec->ar_blockcount);
281                 error = xfs_bwrite(mp, bp);
282                 if (error) {
283                         goto error0;
284                 }
285                 /*
286                  * INO btree root block
287                  */
288                 bp = xfs_buf_get(mp->m_ddev_targp,
289                         XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
290                         BTOBB(mp->m_sb.sb_blocksize), 0);
291                 block = XFS_BUF_TO_SBLOCK(bp);
292                 memset(block, 0, mp->m_sb.sb_blocksize);
293                 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC);
294                 block->bb_level = 0;
295                 block->bb_numrecs = 0;
296                 block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
297                 block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
298                 error = xfs_bwrite(mp, bp);
299                 if (error) {
300                         goto error0;
301                 }
302         }
303         xfs_trans_agblocks_delta(tp, nfree);
304         /*
305          * There are new blocks in the old last a.g.
306          */
307         if (new) {
308                 /*
309                  * Change the agi length.
310                  */
311                 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
312                 if (error) {
313                         goto error0;
314                 }
315                 ASSERT(bp);
316                 agi = XFS_BUF_TO_AGI(bp);
317                 be32_add(&agi->agi_length, new);
318                 ASSERT(nagcount == oagcount ||
319                        be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
320                 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
321                 /*
322                  * Change agf length.
323                  */
324                 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
325                 if (error) {
326                         goto error0;
327                 }
328                 ASSERT(bp);
329                 agf = XFS_BUF_TO_AGF(bp);
330                 be32_add(&agf->agf_length, new);
331                 ASSERT(be32_to_cpu(agf->agf_length) ==
332                        be32_to_cpu(agi->agi_length));
333                 /*
334                  * Free the new space.
335                  */
336                 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
337                         be32_to_cpu(agf->agf_length) - new), new);
338                 if (error) {
339                         goto error0;
340                 }
341         }
342         if (nagcount > oagcount)
343                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
344         if (nb > mp->m_sb.sb_dblocks)
345                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
346                                  nb - mp->m_sb.sb_dblocks);
347         if (nfree)
348                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
349         if (dpct)
350                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
351         error = xfs_trans_commit(tp, 0, NULL);
352         if (error) {
353                 return error;
354         }
355         /* New allocation groups fully initialized, so update mount struct */
356         if (nagimax)
357                 mp->m_maxagi = nagimax;
358         if (mp->m_sb.sb_imax_pct) {
359                 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
360                 do_div(icount, 100);
361                 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
362         } else
363                 mp->m_maxicount = 0;
364         for (agno = 1; agno < nagcount; agno++) {
365                 error = xfs_read_buf(mp, mp->m_ddev_targp,
366                                   XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
367                                   XFS_FSS_TO_BB(mp, 1), 0, &bp);
368                 if (error) {
369                         xfs_fs_cmn_err(CE_WARN, mp,
370                         "error %d reading secondary superblock for ag %d",
371                                 error, agno);
372                         break;
373                 }
374                 sbp = XFS_BUF_TO_SBP(bp);
375                 xfs_xlatesb(sbp, &mp->m_sb, -1, XFS_SB_ALL_BITS);
376                 /*
377                  * If we get an error writing out the alternate superblocks,
378                  * just issue a warning and continue.  The real work is
379                  * already done and committed.
380                  */
381                 if (!(error = xfs_bwrite(mp, bp))) {
382                         continue;
383                 } else {
384                         xfs_fs_cmn_err(CE_WARN, mp,
385                 "write error %d updating secondary superblock for ag %d",
386                                 error, agno);
387                         break; /* no point in continuing */
388                 }
389         }
390         return 0;
391
392  error0:
393         xfs_trans_cancel(tp, XFS_TRANS_ABORT);
394         return error;
395 }
396
397 static int
398 xfs_growfs_log_private(
399         xfs_mount_t             *mp,    /* mount point for filesystem */
400         xfs_growfs_log_t        *in)    /* growfs log input struct */
401 {
402         xfs_extlen_t            nb;
403
404         nb = in->newblocks;
405         if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
406                 return XFS_ERROR(EINVAL);
407         if (nb == mp->m_sb.sb_logblocks &&
408             in->isint == (mp->m_sb.sb_logstart != 0))
409                 return XFS_ERROR(EINVAL);
410         /*
411          * Moving the log is hard, need new interfaces to sync
412          * the log first, hold off all activity while moving it.
413          * Can have shorter or longer log in the same space,
414          * or transform internal to external log or vice versa.
415          */
416         return XFS_ERROR(ENOSYS);
417 }
418
419 /*
420  * protected versions of growfs function acquire and release locks on the mount
421  * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
422  * XFS_IOC_FSGROWFSRT
423  */
424
425
426 int
427 xfs_growfs_data(
428         xfs_mount_t             *mp,
429         xfs_growfs_data_t       *in)
430 {
431         int error;
432         if (!cpsema(&mp->m_growlock))
433                 return XFS_ERROR(EWOULDBLOCK);
434         error = xfs_growfs_data_private(mp, in);
435         vsema(&mp->m_growlock);
436         return error;
437 }
438
439 int
440 xfs_growfs_log(
441         xfs_mount_t             *mp,
442         xfs_growfs_log_t        *in)
443 {
444         int error;
445         if (!cpsema(&mp->m_growlock))
446                 return XFS_ERROR(EWOULDBLOCK);
447         error = xfs_growfs_log_private(mp, in);
448         vsema(&mp->m_growlock);
449         return error;
450 }
451
452 /*
453  * exported through ioctl XFS_IOC_FSCOUNTS
454  */
455
456 int
457 xfs_fs_counts(
458         xfs_mount_t             *mp,
459         xfs_fsop_counts_t       *cnt)
460 {
461         unsigned long   s;
462
463         xfs_icsb_sync_counters_lazy(mp);
464         s = XFS_SB_LOCK(mp);
465         cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
466         cnt->freertx = mp->m_sb.sb_frextents;
467         cnt->freeino = mp->m_sb.sb_ifree;
468         cnt->allocino = mp->m_sb.sb_icount;
469         XFS_SB_UNLOCK(mp, s);
470         return 0;
471 }
472
473 /*
474  * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
475  *
476  * xfs_reserve_blocks is called to set m_resblks
477  * in the in-core mount table. The number of unused reserved blocks
478  * is kept in m_resblks_avail.
479  *
480  * Reserve the requested number of blocks if available. Otherwise return
481  * as many as possible to satisfy the request. The actual number
482  * reserved are returned in outval
483  *
484  * A null inval pointer indicates that only the current reserved blocks
485  * available  should  be returned no settings are changed.
486  */
487
488 int
489 xfs_reserve_blocks(
490         xfs_mount_t             *mp,
491         __uint64_t              *inval,
492         xfs_fsop_resblks_t      *outval)
493 {
494         __int64_t               lcounter, delta;
495         __uint64_t              request;
496         unsigned long           s;
497
498         /* If inval is null, report current values and return */
499
500         if (inval == (__uint64_t *)NULL) {
501                 outval->resblks = mp->m_resblks;
502                 outval->resblks_avail = mp->m_resblks_avail;
503                 return 0;
504         }
505
506         request = *inval;
507         s = XFS_SB_LOCK(mp);
508
509         /*
510          * If our previous reservation was larger than the current value,
511          * then move any unused blocks back to the free pool.
512          */
513
514         if (mp->m_resblks > request) {
515                 lcounter = mp->m_resblks_avail - request;
516                 if (lcounter  > 0) {            /* release unused blocks */
517                         mp->m_sb.sb_fdblocks += lcounter;
518                         mp->m_resblks_avail -= lcounter;
519                 }
520                 mp->m_resblks = request;
521         } else {
522                 __int64_t       free;
523
524                 free =  mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
525                 delta = request - mp->m_resblks;
526                 lcounter = free - delta;
527                 if (lcounter < 0) {
528                         /* We can't satisfy the request, just get what we can */
529                         mp->m_resblks += free;
530                         mp->m_resblks_avail += free;
531                         mp->m_sb.sb_fdblocks = XFS_ALLOC_SET_ASIDE(mp);
532                 } else {
533                         mp->m_sb.sb_fdblocks =
534                                 lcounter + XFS_ALLOC_SET_ASIDE(mp);
535                         mp->m_resblks = request;
536                         mp->m_resblks_avail += delta;
537                 }
538         }
539
540         outval->resblks = mp->m_resblks;
541         outval->resblks_avail = mp->m_resblks_avail;
542         XFS_SB_UNLOCK(mp, s);
543         return 0;
544 }
545
546 void
547 xfs_fs_log_dummy(
548         xfs_mount_t     *mp)
549 {
550         xfs_trans_t     *tp;
551         xfs_inode_t     *ip;
552
553         tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
554         if (xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0)) {
555                 xfs_trans_cancel(tp, 0);
556                 return;
557         }
558
559         ip = mp->m_rootip;
560         xfs_ilock(ip, XFS_ILOCK_EXCL);
561
562         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
563         xfs_trans_ihold(tp, ip);
564         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
565         xfs_trans_set_sync(tp);
566         xfs_trans_commit(tp, 0, NULL);
567
568         xfs_iunlock(ip, XFS_ILOCK_EXCL);
569 }
570
571 int
572 xfs_fs_goingdown(
573         xfs_mount_t     *mp,
574         __uint32_t      inflags)
575 {
576         switch (inflags) {
577         case XFS_FSOP_GOING_FLAGS_DEFAULT: {
578                 struct bhv_vfs *vfsp = XFS_MTOVFS(mp);
579                 struct super_block *sb = freeze_bdev(vfsp->vfs_super->s_bdev);
580
581                 if (sb && !IS_ERR(sb)) {
582                         xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
583                         thaw_bdev(sb->s_bdev, sb);
584                 }
585         
586                 break;
587         }
588         case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
589                 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
590                 break;
591         case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
592                 xfs_force_shutdown(mp,
593                                 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
594                 break;
595         default:
596                 return XFS_ERROR(EINVAL);
597         }
598
599         return 0;
600 }