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TOMOYO Linux Cross Reference
Linux/fs/xfs/xfs_fsops.c

Version: ~ [ linux-5.5-rc1 ] ~ [ linux-5.4.2 ] ~ [ linux-5.3.15 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.88 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.158 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.206 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.206 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.78 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  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_log.h"
 22 #include "xfs_trans.h"
 23 #include "xfs_sb.h"
 24 #include "xfs_ag.h"
 25 #include "xfs_mount.h"
 26 #include "xfs_bmap_btree.h"
 27 #include "xfs_alloc_btree.h"
 28 #include "xfs_ialloc_btree.h"
 29 #include "xfs_dinode.h"
 30 #include "xfs_inode.h"
 31 #include "xfs_inode_item.h"
 32 #include "xfs_btree.h"
 33 #include "xfs_error.h"
 34 #include "xfs_alloc.h"
 35 #include "xfs_ialloc.h"
 36 #include "xfs_fsops.h"
 37 #include "xfs_itable.h"
 38 #include "xfs_trans_space.h"
 39 #include "xfs_rtalloc.h"
 40 #include "xfs_filestream.h"
 41 #include "xfs_trace.h"
 42 
 43 /*
 44  * File system operations
 45  */
 46 
 47 int
 48 xfs_fs_geometry(
 49         xfs_mount_t             *mp,
 50         xfs_fsop_geom_t         *geo,
 51         int                     new_version)
 52 {
 53 
 54         memset(geo, 0, sizeof(*geo));
 55 
 56         geo->blocksize = mp->m_sb.sb_blocksize;
 57         geo->rtextsize = mp->m_sb.sb_rextsize;
 58         geo->agblocks = mp->m_sb.sb_agblocks;
 59         geo->agcount = mp->m_sb.sb_agcount;
 60         geo->logblocks = mp->m_sb.sb_logblocks;
 61         geo->sectsize = mp->m_sb.sb_sectsize;
 62         geo->inodesize = mp->m_sb.sb_inodesize;
 63         geo->imaxpct = mp->m_sb.sb_imax_pct;
 64         geo->datablocks = mp->m_sb.sb_dblocks;
 65         geo->rtblocks = mp->m_sb.sb_rblocks;
 66         geo->rtextents = mp->m_sb.sb_rextents;
 67         geo->logstart = mp->m_sb.sb_logstart;
 68         ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
 69         memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
 70         if (new_version >= 2) {
 71                 geo->sunit = mp->m_sb.sb_unit;
 72                 geo->swidth = mp->m_sb.sb_width;
 73         }
 74         if (new_version >= 3) {
 75                 geo->version = XFS_FSOP_GEOM_VERSION;
 76                 geo->flags =
 77                         (xfs_sb_version_hasattr(&mp->m_sb) ?
 78                                 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
 79                         (xfs_sb_version_hasnlink(&mp->m_sb) ?
 80                                 XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
 81                         (xfs_sb_version_hasquota(&mp->m_sb) ?
 82                                 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
 83                         (xfs_sb_version_hasalign(&mp->m_sb) ?
 84                                 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
 85                         (xfs_sb_version_hasdalign(&mp->m_sb) ?
 86                                 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
 87                         (xfs_sb_version_hasshared(&mp->m_sb) ?
 88                                 XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
 89                         (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
 90                                 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
 91                         (xfs_sb_version_hasdirv2(&mp->m_sb) ?
 92                                 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
 93                         (xfs_sb_version_hassector(&mp->m_sb) ?
 94                                 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
 95                         (xfs_sb_version_hasasciici(&mp->m_sb) ?
 96                                 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
 97                         (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
 98                                 XFS_FSOP_GEOM_FLAGS_LAZYSB : 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         struct xfs_btree_block  *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_trans_t             *tp;
139 
140         nb = in->newblocks;
141         pct = in->imaxpct;
142         if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
143                 return XFS_ERROR(EINVAL);
144         if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
145                 return error;
146         dpct = pct - mp->m_sb.sb_imax_pct;
147         bp = xfs_buf_read_uncached(mp->m_ddev_targp,
148                                 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
149                                 XFS_FSS_TO_BB(mp, 1), 0);
150         if (!bp)
151                 return EIO;
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 = (xfs_rfsblock_t)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 
166         /* allocate the new per-ag structures */
167         if (nagcount > oagcount) {
168                 error = xfs_initialize_perag(mp, nagcount, &nagimax);
169                 if (error)
170                         return error;
171         }
172 
173         tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
174         tp->t_flags |= XFS_TRANS_RESERVE;
175         if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
176                         XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
177                 xfs_trans_cancel(tp, 0);
178                 return error;
179         }
180 
181         /*
182          * Write new AG headers to disk. Non-transactional, but written
183          * synchronously so they are completed prior to the growfs transaction
184          * being logged.
185          */
186         nfree = 0;
187         for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
188                 /*
189                  * AG freelist header block
190                  */
191                 bp = xfs_buf_get(mp->m_ddev_targp,
192                                  XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
193                                  XFS_FSS_TO_BB(mp, 1), 0);
194                 if (!bp) {
195                         error = ENOMEM;
196                         goto error0;
197                 }
198                 agf = XFS_BUF_TO_AGF(bp);
199                 memset(agf, 0, mp->m_sb.sb_sectsize);
200                 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
201                 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
202                 agf->agf_seqno = cpu_to_be32(agno);
203                 if (agno == nagcount - 1)
204                         agsize =
205                                 nb -
206                                 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
207                 else
208                         agsize = mp->m_sb.sb_agblocks;
209                 agf->agf_length = cpu_to_be32(agsize);
210                 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
211                 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
212                 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
213                 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
214                 agf->agf_flfirst = 0;
215                 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
216                 agf->agf_flcount = 0;
217                 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
218                 agf->agf_freeblks = cpu_to_be32(tmpsize);
219                 agf->agf_longest = cpu_to_be32(tmpsize);
220                 error = xfs_bwrite(bp);
221                 xfs_buf_relse(bp);
222                 if (error)
223                         goto error0;
224 
225                 /*
226                  * AG inode header block
227                  */
228                 bp = xfs_buf_get(mp->m_ddev_targp,
229                                  XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
230                                  XFS_FSS_TO_BB(mp, 1), 0);
231                 if (!bp) {
232                         error = ENOMEM;
233                         goto error0;
234                 }
235                 agi = XFS_BUF_TO_AGI(bp);
236                 memset(agi, 0, mp->m_sb.sb_sectsize);
237                 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
238                 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
239                 agi->agi_seqno = cpu_to_be32(agno);
240                 agi->agi_length = cpu_to_be32(agsize);
241                 agi->agi_count = 0;
242                 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
243                 agi->agi_level = cpu_to_be32(1);
244                 agi->agi_freecount = 0;
245                 agi->agi_newino = cpu_to_be32(NULLAGINO);
246                 agi->agi_dirino = cpu_to_be32(NULLAGINO);
247                 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
248                         agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
249                 error = xfs_bwrite(bp);
250                 xfs_buf_relse(bp);
251                 if (error)
252                         goto error0;
253 
254                 /*
255                  * BNO btree root block
256                  */
257                 bp = xfs_buf_get(mp->m_ddev_targp,
258                                  XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
259                                  BTOBB(mp->m_sb.sb_blocksize), 0);
260                 if (!bp) {
261                         error = ENOMEM;
262                         goto error0;
263                 }
264                 block = XFS_BUF_TO_BLOCK(bp);
265                 memset(block, 0, mp->m_sb.sb_blocksize);
266                 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC);
267                 block->bb_level = 0;
268                 block->bb_numrecs = cpu_to_be16(1);
269                 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
270                 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
271                 arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
272                 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
273                 arec->ar_blockcount = cpu_to_be32(
274                         agsize - be32_to_cpu(arec->ar_startblock));
275                 error = xfs_bwrite(bp);
276                 xfs_buf_relse(bp);
277                 if (error)
278                         goto error0;
279 
280                 /*
281                  * CNT btree root block
282                  */
283                 bp = xfs_buf_get(mp->m_ddev_targp,
284                                  XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
285                                  BTOBB(mp->m_sb.sb_blocksize), 0);
286                 if (!bp) {
287                         error = ENOMEM;
288                         goto error0;
289                 }
290                 block = XFS_BUF_TO_BLOCK(bp);
291                 memset(block, 0, mp->m_sb.sb_blocksize);
292                 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
293                 block->bb_level = 0;
294                 block->bb_numrecs = cpu_to_be16(1);
295                 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
296                 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
297                 arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
298                 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
299                 arec->ar_blockcount = cpu_to_be32(
300                         agsize - be32_to_cpu(arec->ar_startblock));
301                 nfree += be32_to_cpu(arec->ar_blockcount);
302                 error = xfs_bwrite(bp);
303                 xfs_buf_relse(bp);
304                 if (error)
305                         goto error0;
306 
307                 /*
308                  * INO btree root block
309                  */
310                 bp = xfs_buf_get(mp->m_ddev_targp,
311                                  XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
312                                  BTOBB(mp->m_sb.sb_blocksize), 0);
313                 if (!bp) {
314                         error = ENOMEM;
315                         goto error0;
316                 }
317                 block = XFS_BUF_TO_BLOCK(bp);
318                 memset(block, 0, mp->m_sb.sb_blocksize);
319                 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC);
320                 block->bb_level = 0;
321                 block->bb_numrecs = 0;
322                 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
323                 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
324                 error = xfs_bwrite(bp);
325                 xfs_buf_relse(bp);
326                 if (error)
327                         goto error0;
328         }
329         xfs_trans_agblocks_delta(tp, nfree);
330         /*
331          * There are new blocks in the old last a.g.
332          */
333         if (new) {
334                 /*
335                  * Change the agi length.
336                  */
337                 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
338                 if (error) {
339                         goto error0;
340                 }
341                 ASSERT(bp);
342                 agi = XFS_BUF_TO_AGI(bp);
343                 be32_add_cpu(&agi->agi_length, new);
344                 ASSERT(nagcount == oagcount ||
345                        be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
346                 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
347                 /*
348                  * Change agf length.
349                  */
350                 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
351                 if (error) {
352                         goto error0;
353                 }
354                 ASSERT(bp);
355                 agf = XFS_BUF_TO_AGF(bp);
356                 be32_add_cpu(&agf->agf_length, new);
357                 ASSERT(be32_to_cpu(agf->agf_length) ==
358                        be32_to_cpu(agi->agi_length));
359 
360                 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
361                 /*
362                  * Free the new space.
363                  */
364                 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
365                         be32_to_cpu(agf->agf_length) - new), new);
366                 if (error) {
367                         goto error0;
368                 }
369         }
370 
371         /*
372          * Update changed superblock fields transactionally. These are not
373          * seen by the rest of the world until the transaction commit applies
374          * them atomically to the superblock.
375          */
376         if (nagcount > oagcount)
377                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
378         if (nb > mp->m_sb.sb_dblocks)
379                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
380                                  nb - mp->m_sb.sb_dblocks);
381         if (nfree)
382                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
383         if (dpct)
384                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
385         error = xfs_trans_commit(tp, 0);
386         if (error)
387                 return error;
388 
389         /* New allocation groups fully initialized, so update mount struct */
390         if (nagimax)
391                 mp->m_maxagi = nagimax;
392         if (mp->m_sb.sb_imax_pct) {
393                 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
394                 do_div(icount, 100);
395                 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
396         } else
397                 mp->m_maxicount = 0;
398         xfs_set_low_space_thresholds(mp);
399 
400         /* update secondary superblocks. */
401         for (agno = 1; agno < nagcount; agno++) {
402                 error = 0;
403                 /*
404                  * new secondary superblocks need to be zeroed, not read from
405                  * disk as the contents of the new area we are growing into is
406                  * completely unknown.
407                  */
408                 if (agno < oagcount) {
409                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
410                                   XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
411                                   XFS_FSS_TO_BB(mp, 1), 0, &bp);
412                 } else {
413                         bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
414                                   XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
415                                   XFS_FSS_TO_BB(mp, 1), 0);
416                         if (bp)
417                                 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
418                         else
419                                 error = ENOMEM;
420                 }
421 
422                 if (error) {
423                         xfs_warn(mp,
424                 "error %d reading secondary superblock for ag %d",
425                                 error, agno);
426                         break;
427                 }
428                 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
429                 /*
430                  * If we get an error writing out the alternate superblocks,
431                  * just issue a warning and continue.  The real work is
432                  * already done and committed.
433                  */
434                 error = xfs_bwrite(bp);
435                 xfs_buf_relse(bp);
436                 if (error) {
437                         xfs_warn(mp,
438                 "write error %d updating secondary superblock for ag %d",
439                                 error, agno);
440                         break; /* no point in continuing */
441                 }
442         }
443         return error;
444 
445  error0:
446         xfs_trans_cancel(tp, XFS_TRANS_ABORT);
447         return error;
448 }
449 
450 static int
451 xfs_growfs_log_private(
452         xfs_mount_t             *mp,    /* mount point for filesystem */
453         xfs_growfs_log_t        *in)    /* growfs log input struct */
454 {
455         xfs_extlen_t            nb;
456 
457         nb = in->newblocks;
458         if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
459                 return XFS_ERROR(EINVAL);
460         if (nb == mp->m_sb.sb_logblocks &&
461             in->isint == (mp->m_sb.sb_logstart != 0))
462                 return XFS_ERROR(EINVAL);
463         /*
464          * Moving the log is hard, need new interfaces to sync
465          * the log first, hold off all activity while moving it.
466          * Can have shorter or longer log in the same space,
467          * or transform internal to external log or vice versa.
468          */
469         return XFS_ERROR(ENOSYS);
470 }
471 
472 /*
473  * protected versions of growfs function acquire and release locks on the mount
474  * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
475  * XFS_IOC_FSGROWFSRT
476  */
477 
478 
479 int
480 xfs_growfs_data(
481         xfs_mount_t             *mp,
482         xfs_growfs_data_t       *in)
483 {
484         int error;
485 
486         if (!capable(CAP_SYS_ADMIN))
487                 return XFS_ERROR(EPERM);
488         if (!mutex_trylock(&mp->m_growlock))
489                 return XFS_ERROR(EWOULDBLOCK);
490         error = xfs_growfs_data_private(mp, in);
491         mutex_unlock(&mp->m_growlock);
492         return error;
493 }
494 
495 int
496 xfs_growfs_log(
497         xfs_mount_t             *mp,
498         xfs_growfs_log_t        *in)
499 {
500         int error;
501 
502         if (!capable(CAP_SYS_ADMIN))
503                 return XFS_ERROR(EPERM);
504         if (!mutex_trylock(&mp->m_growlock))
505                 return XFS_ERROR(EWOULDBLOCK);
506         error = xfs_growfs_log_private(mp, in);
507         mutex_unlock(&mp->m_growlock);
508         return error;
509 }
510 
511 /*
512  * exported through ioctl XFS_IOC_FSCOUNTS
513  */
514 
515 int
516 xfs_fs_counts(
517         xfs_mount_t             *mp,
518         xfs_fsop_counts_t       *cnt)
519 {
520         xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
521         spin_lock(&mp->m_sb_lock);
522         cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
523         cnt->freertx = mp->m_sb.sb_frextents;
524         cnt->freeino = mp->m_sb.sb_ifree;
525         cnt->allocino = mp->m_sb.sb_icount;
526         spin_unlock(&mp->m_sb_lock);
527         return 0;
528 }
529 
530 /*
531  * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
532  *
533  * xfs_reserve_blocks is called to set m_resblks
534  * in the in-core mount table. The number of unused reserved blocks
535  * is kept in m_resblks_avail.
536  *
537  * Reserve the requested number of blocks if available. Otherwise return
538  * as many as possible to satisfy the request. The actual number
539  * reserved are returned in outval
540  *
541  * A null inval pointer indicates that only the current reserved blocks
542  * available  should  be returned no settings are changed.
543  */
544 
545 int
546 xfs_reserve_blocks(
547         xfs_mount_t             *mp,
548         __uint64_t              *inval,
549         xfs_fsop_resblks_t      *outval)
550 {
551         __int64_t               lcounter, delta, fdblks_delta;
552         __uint64_t              request;
553 
554         /* If inval is null, report current values and return */
555         if (inval == (__uint64_t *)NULL) {
556                 if (!outval)
557                         return EINVAL;
558                 outval->resblks = mp->m_resblks;
559                 outval->resblks_avail = mp->m_resblks_avail;
560                 return 0;
561         }
562 
563         request = *inval;
564 
565         /*
566          * With per-cpu counters, this becomes an interesting
567          * problem. we needto work out if we are freeing or allocation
568          * blocks first, then we can do the modification as necessary.
569          *
570          * We do this under the m_sb_lock so that if we are near
571          * ENOSPC, we will hold out any changes while we work out
572          * what to do. This means that the amount of free space can
573          * change while we do this, so we need to retry if we end up
574          * trying to reserve more space than is available.
575          *
576          * We also use the xfs_mod_incore_sb() interface so that we
577          * don't have to care about whether per cpu counter are
578          * enabled, disabled or even compiled in....
579          */
580 retry:
581         spin_lock(&mp->m_sb_lock);
582         xfs_icsb_sync_counters_locked(mp, 0);
583 
584         /*
585          * If our previous reservation was larger than the current value,
586          * then move any unused blocks back to the free pool.
587          */
588         fdblks_delta = 0;
589         if (mp->m_resblks > request) {
590                 lcounter = mp->m_resblks_avail - request;
591                 if (lcounter  > 0) {            /* release unused blocks */
592                         fdblks_delta = lcounter;
593                         mp->m_resblks_avail -= lcounter;
594                 }
595                 mp->m_resblks = request;
596         } else {
597                 __int64_t       free;
598 
599                 free =  mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
600                 if (!free)
601                         goto out; /* ENOSPC and fdblks_delta = 0 */
602 
603                 delta = request - mp->m_resblks;
604                 lcounter = free - delta;
605                 if (lcounter < 0) {
606                         /* We can't satisfy the request, just get what we can */
607                         mp->m_resblks += free;
608                         mp->m_resblks_avail += free;
609                         fdblks_delta = -free;
610                 } else {
611                         fdblks_delta = -delta;
612                         mp->m_resblks = request;
613                         mp->m_resblks_avail += delta;
614                 }
615         }
616 out:
617         if (outval) {
618                 outval->resblks = mp->m_resblks;
619                 outval->resblks_avail = mp->m_resblks_avail;
620         }
621         spin_unlock(&mp->m_sb_lock);
622 
623         if (fdblks_delta) {
624                 /*
625                  * If we are putting blocks back here, m_resblks_avail is
626                  * already at its max so this will put it in the free pool.
627                  *
628                  * If we need space, we'll either succeed in getting it
629                  * from the free block count or we'll get an enospc. If
630                  * we get a ENOSPC, it means things changed while we were
631                  * calculating fdblks_delta and so we should try again to
632                  * see if there is anything left to reserve.
633                  *
634                  * Don't set the reserved flag here - we don't want to reserve
635                  * the extra reserve blocks from the reserve.....
636                  */
637                 int error;
638                 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
639                                                  fdblks_delta, 0);
640                 if (error == ENOSPC)
641                         goto retry;
642         }
643         return 0;
644 }
645 
646 /*
647  * Dump a transaction into the log that contains no real change. This is needed
648  * to be able to make the log dirty or stamp the current tail LSN into the log
649  * during the covering operation.
650  *
651  * We cannot use an inode here for this - that will push dirty state back up
652  * into the VFS and then periodic inode flushing will prevent log covering from
653  * making progress. Hence we log a field in the superblock instead and use a
654  * synchronous transaction to ensure the superblock is immediately unpinned
655  * and can be written back.
656  */
657 int
658 xfs_fs_log_dummy(
659         xfs_mount_t     *mp)
660 {
661         xfs_trans_t     *tp;
662         int             error;
663 
664         tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
665         error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
666                                         XFS_DEFAULT_LOG_COUNT);
667         if (error) {
668                 xfs_trans_cancel(tp, 0);
669                 return error;
670         }
671 
672         /* log the UUID because it is an unchanging field */
673         xfs_mod_sb(tp, XFS_SB_UUID);
674         xfs_trans_set_sync(tp);
675         return xfs_trans_commit(tp, 0);
676 }
677 
678 int
679 xfs_fs_goingdown(
680         xfs_mount_t     *mp,
681         __uint32_t      inflags)
682 {
683         switch (inflags) {
684         case XFS_FSOP_GOING_FLAGS_DEFAULT: {
685                 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
686 
687                 if (sb && !IS_ERR(sb)) {
688                         xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
689                         thaw_bdev(sb->s_bdev, sb);
690                 }
691 
692                 break;
693         }
694         case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
695                 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
696                 break;
697         case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
698                 xfs_force_shutdown(mp,
699                                 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
700                 break;
701         default:
702                 return XFS_ERROR(EINVAL);
703         }
704 
705         return 0;
706 }
707 
708 /*
709  * Force a shutdown of the filesystem instantly while keeping the filesystem
710  * consistent. We don't do an unmount here; just shutdown the shop, make sure
711  * that absolutely nothing persistent happens to this filesystem after this
712  * point.
713  */
714 void
715 xfs_do_force_shutdown(
716         xfs_mount_t     *mp,
717         int             flags,
718         char            *fname,
719         int             lnnum)
720 {
721         int             logerror;
722 
723         logerror = flags & SHUTDOWN_LOG_IO_ERROR;
724 
725         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
726                 xfs_notice(mp,
727         "%s(0x%x) called from line %d of file %s.  Return address = 0x%p",
728                         __func__, flags, lnnum, fname, __return_address);
729         }
730         /*
731          * No need to duplicate efforts.
732          */
733         if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
734                 return;
735 
736         /*
737          * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
738          * queue up anybody new on the log reservations, and wakes up
739          * everybody who's sleeping on log reservations to tell them
740          * the bad news.
741          */
742         if (xfs_log_force_umount(mp, logerror))
743                 return;
744 
745         if (flags & SHUTDOWN_CORRUPT_INCORE) {
746                 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
747     "Corruption of in-memory data detected.  Shutting down filesystem");
748                 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
749                         xfs_stack_trace();
750         } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
751                 if (logerror) {
752                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
753                 "Log I/O Error Detected.  Shutting down filesystem");
754                 } else if (flags & SHUTDOWN_DEVICE_REQ) {
755                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
756                 "All device paths lost.  Shutting down filesystem");
757                 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
758                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
759                 "I/O Error Detected. Shutting down filesystem");
760                 }
761         }
762         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
763                 xfs_alert(mp,
764         "Please umount the filesystem and rectify the problem(s)");
765         }
766 }
767 

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