Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

Linux/fs/xfs/xfs_super.c

  1 /*
  2  * Copyright (c) 2000-2006 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 
 19 #include "xfs.h"
 20 #include "xfs_shared.h"
 21 #include "xfs_format.h"
 22 #include "xfs_log_format.h"
 23 #include "xfs_trans_resv.h"
 24 #include "xfs_sb.h"
 25 #include "xfs_mount.h"
 26 #include "xfs_da_format.h"
 27 #include "xfs_inode.h"
 28 #include "xfs_btree.h"
 29 #include "xfs_bmap.h"
 30 #include "xfs_alloc.h"
 31 #include "xfs_error.h"
 32 #include "xfs_fsops.h"
 33 #include "xfs_trans.h"
 34 #include "xfs_buf_item.h"
 35 #include "xfs_log.h"
 36 #include "xfs_log_priv.h"
 37 #include "xfs_da_btree.h"
 38 #include "xfs_dir2.h"
 39 #include "xfs_extfree_item.h"
 40 #include "xfs_mru_cache.h"
 41 #include "xfs_inode_item.h"
 42 #include "xfs_icache.h"
 43 #include "xfs_trace.h"
 44 #include "xfs_icreate_item.h"
 45 #include "xfs_filestream.h"
 46 #include "xfs_quota.h"
 47 #include "xfs_sysfs.h"
 48 #include "xfs_ondisk.h"
 49 #include "xfs_rmap_item.h"
 50 
 51 #include <linux/namei.h>
 52 #include <linux/init.h>
 53 #include <linux/slab.h>
 54 #include <linux/mount.h>
 55 #include <linux/mempool.h>
 56 #include <linux/writeback.h>
 57 #include <linux/kthread.h>
 58 #include <linux/freezer.h>
 59 #include <linux/parser.h>
 60 
 61 static const struct super_operations xfs_super_operations;
 62 struct bio_set *xfs_ioend_bioset;
 63 
 64 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
 65 #ifdef DEBUG
 66 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
 67 #endif
 68 
 69 /*
 70  * Table driven mount option parser.
 71  */
 72 enum {
 73         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev, Opt_biosize,
 74         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
 75         Opt_mtpt, Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
 76         Opt_allocsize, Opt_norecovery, Opt_barrier, Opt_nobarrier,
 77         Opt_inode64, Opt_inode32, Opt_ikeep, Opt_noikeep,
 78         Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2, Opt_filestreams,
 79         Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota, Opt_prjquota,
 80         Opt_uquota, Opt_gquota, Opt_pquota,
 81         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
 82         Opt_discard, Opt_nodiscard, Opt_dax, Opt_err,
 83 };
 84 
 85 static const match_table_t tokens = {
 86         {Opt_logbufs,   "logbufs=%u"},  /* number of XFS log buffers */
 87         {Opt_logbsize,  "logbsize=%s"}, /* size of XFS log buffers */
 88         {Opt_logdev,    "logdev=%s"},   /* log device */
 89         {Opt_rtdev,     "rtdev=%s"},    /* realtime I/O device */
 90         {Opt_biosize,   "biosize=%u"},  /* log2 of preferred buffered io size */
 91         {Opt_wsync,     "wsync"},       /* safe-mode nfs compatible mount */
 92         {Opt_noalign,   "noalign"},     /* turn off stripe alignment */
 93         {Opt_swalloc,   "swalloc"},     /* turn on stripe width allocation */
 94         {Opt_sunit,     "sunit=%u"},    /* data volume stripe unit */
 95         {Opt_swidth,    "swidth=%u"},   /* data volume stripe width */
 96         {Opt_nouuid,    "nouuid"},      /* ignore filesystem UUID */
 97         {Opt_mtpt,      "mtpt"},        /* filesystem mount point */
 98         {Opt_grpid,     "grpid"},       /* group-ID from parent directory */
 99         {Opt_nogrpid,   "nogrpid"},     /* group-ID from current process */
100         {Opt_bsdgroups, "bsdgroups"},   /* group-ID from parent directory */
101         {Opt_sysvgroups,"sysvgroups"},  /* group-ID from current process */
102         {Opt_allocsize, "allocsize=%s"},/* preferred allocation size */
103         {Opt_norecovery,"norecovery"},  /* don't run XFS recovery */
104         {Opt_barrier,   "barrier"},     /* use writer barriers for log write and
105                                          * unwritten extent conversion */
106         {Opt_nobarrier, "nobarrier"},   /* .. disable */
107         {Opt_inode64,   "inode64"},     /* inodes can be allocated anywhere */
108         {Opt_inode32,   "inode32"},     /* inode allocation limited to
109                                          * XFS_MAXINUMBER_32 */
110         {Opt_ikeep,     "ikeep"},       /* do not free empty inode clusters */
111         {Opt_noikeep,   "noikeep"},     /* free empty inode clusters */
112         {Opt_largeio,   "largeio"},     /* report large I/O sizes in stat() */
113         {Opt_nolargeio, "nolargeio"},   /* do not report large I/O sizes
114                                          * in stat(). */
115         {Opt_attr2,     "attr2"},       /* do use attr2 attribute format */
116         {Opt_noattr2,   "noattr2"},     /* do not use attr2 attribute format */
117         {Opt_filestreams,"filestreams"},/* use filestreams allocator */
118         {Opt_quota,     "quota"},       /* disk quotas (user) */
119         {Opt_noquota,   "noquota"},     /* no quotas */
120         {Opt_usrquota,  "usrquota"},    /* user quota enabled */
121         {Opt_grpquota,  "grpquota"},    /* group quota enabled */
122         {Opt_prjquota,  "prjquota"},    /* project quota enabled */
123         {Opt_uquota,    "uquota"},      /* user quota (IRIX variant) */
124         {Opt_gquota,    "gquota"},      /* group quota (IRIX variant) */
125         {Opt_pquota,    "pquota"},      /* project quota (IRIX variant) */
126         {Opt_uqnoenforce,"uqnoenforce"},/* user quota limit enforcement */
127         {Opt_gqnoenforce,"gqnoenforce"},/* group quota limit enforcement */
128         {Opt_pqnoenforce,"pqnoenforce"},/* project quota limit enforcement */
129         {Opt_qnoenforce, "qnoenforce"}, /* same as uqnoenforce */
130         {Opt_discard,   "discard"},     /* Discard unused blocks */
131         {Opt_nodiscard, "nodiscard"},   /* Do not discard unused blocks */
132 
133         {Opt_dax,       "dax"},         /* Enable direct access to bdev pages */
134         {Opt_err,       NULL},
135 };
136 
137 
138 STATIC int
139 suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
140 {
141         int     last, shift_left_factor = 0, _res;
142         char    *value;
143         int     ret = 0;
144 
145         value = match_strdup(s);
146         if (!value)
147                 return -ENOMEM;
148 
149         last = strlen(value) - 1;
150         if (value[last] == 'K' || value[last] == 'k') {
151                 shift_left_factor = 10;
152                 value[last] = '\0';
153         }
154         if (value[last] == 'M' || value[last] == 'm') {
155                 shift_left_factor = 20;
156                 value[last] = '\0';
157         }
158         if (value[last] == 'G' || value[last] == 'g') {
159                 shift_left_factor = 30;
160                 value[last] = '\0';
161         }
162 
163         if (kstrtoint(value, base, &_res))
164                 ret = -EINVAL;
165         kfree(value);
166         *res = _res << shift_left_factor;
167         return ret;
168 }
169 
170 /*
171  * This function fills in xfs_mount_t fields based on mount args.
172  * Note: the superblock has _not_ yet been read in.
173  *
174  * Note that this function leaks the various device name allocations on
175  * failure.  The caller takes care of them.
176  *
177  * *sb is const because this is also used to test options on the remount
178  * path, and we don't want this to have any side effects at remount time.
179  * Today this function does not change *sb, but just to future-proof...
180  */
181 STATIC int
182 xfs_parseargs(
183         struct xfs_mount        *mp,
184         char                    *options)
185 {
186         const struct super_block *sb = mp->m_super;
187         char                    *p;
188         substring_t             args[MAX_OPT_ARGS];
189         int                     dsunit = 0;
190         int                     dswidth = 0;
191         int                     iosize = 0;
192         __uint8_t               iosizelog = 0;
193 
194         /*
195          * set up the mount name first so all the errors will refer to the
196          * correct device.
197          */
198         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
199         if (!mp->m_fsname)
200                 return -ENOMEM;
201         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
202 
203         /*
204          * Copy binary VFS mount flags we are interested in.
205          */
206         if (sb->s_flags & MS_RDONLY)
207                 mp->m_flags |= XFS_MOUNT_RDONLY;
208         if (sb->s_flags & MS_DIRSYNC)
209                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
210         if (sb->s_flags & MS_SYNCHRONOUS)
211                 mp->m_flags |= XFS_MOUNT_WSYNC;
212 
213         /*
214          * Set some default flags that could be cleared by the mount option
215          * parsing.
216          */
217         mp->m_flags |= XFS_MOUNT_BARRIER;
218         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
219 
220         /*
221          * These can be overridden by the mount option parsing.
222          */
223         mp->m_logbufs = -1;
224         mp->m_logbsize = -1;
225 
226         if (!options)
227                 goto done;
228 
229         while ((p = strsep(&options, ",")) != NULL) {
230                 int             token;
231 
232                 if (!*p)
233                         continue;
234 
235                 token = match_token(p, tokens, args);
236                 switch (token) {
237                 case Opt_logbufs:
238                         if (match_int(args, &mp->m_logbufs))
239                                 return -EINVAL;
240                         break;
241                 case Opt_logbsize:
242                         if (suffix_kstrtoint(args, 10, &mp->m_logbsize))
243                                 return -EINVAL;
244                         break;
245                 case Opt_logdev:
246                         mp->m_logname = match_strdup(args);
247                         if (!mp->m_logname)
248                                 return -ENOMEM;
249                         break;
250                 case Opt_mtpt:
251                         xfs_warn(mp, "%s option not allowed on this system", p);
252                         return -EINVAL;
253                 case Opt_rtdev:
254                         mp->m_rtname = match_strdup(args);
255                         if (!mp->m_rtname)
256                                 return -ENOMEM;
257                         break;
258                 case Opt_allocsize:
259                 case Opt_biosize:
260                         if (suffix_kstrtoint(args, 10, &iosize))
261                                 return -EINVAL;
262                         iosizelog = ffs(iosize) - 1;
263                         break;
264                 case Opt_grpid:
265                 case Opt_bsdgroups:
266                         mp->m_flags |= XFS_MOUNT_GRPID;
267                         break;
268                 case Opt_nogrpid:
269                 case Opt_sysvgroups:
270                         mp->m_flags &= ~XFS_MOUNT_GRPID;
271                         break;
272                 case Opt_wsync:
273                         mp->m_flags |= XFS_MOUNT_WSYNC;
274                         break;
275                 case Opt_norecovery:
276                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
277                         break;
278                 case Opt_noalign:
279                         mp->m_flags |= XFS_MOUNT_NOALIGN;
280                         break;
281                 case Opt_swalloc:
282                         mp->m_flags |= XFS_MOUNT_SWALLOC;
283                         break;
284                 case Opt_sunit:
285                         if (match_int(args, &dsunit))
286                                 return -EINVAL;
287                         break;
288                 case Opt_swidth:
289                         if (match_int(args, &dswidth))
290                                 return -EINVAL;
291                         break;
292                 case Opt_inode32:
293                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
294                         break;
295                 case Opt_inode64:
296                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
297                         break;
298                 case Opt_nouuid:
299                         mp->m_flags |= XFS_MOUNT_NOUUID;
300                         break;
301                 case Opt_barrier:
302                         mp->m_flags |= XFS_MOUNT_BARRIER;
303                         break;
304                 case Opt_nobarrier:
305                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
306                         break;
307                 case Opt_ikeep:
308                         mp->m_flags |= XFS_MOUNT_IKEEP;
309                         break;
310                 case Opt_noikeep:
311                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
312                         break;
313                 case Opt_largeio:
314                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
315                         break;
316                 case Opt_nolargeio:
317                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
318                         break;
319                 case Opt_attr2:
320                         mp->m_flags |= XFS_MOUNT_ATTR2;
321                         break;
322                 case Opt_noattr2:
323                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
324                         mp->m_flags |= XFS_MOUNT_NOATTR2;
325                         break;
326                 case Opt_filestreams:
327                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
328                         break;
329                 case Opt_noquota:
330                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
331                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
332                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
333                         break;
334                 case Opt_quota:
335                 case Opt_uquota:
336                 case Opt_usrquota:
337                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
338                                          XFS_UQUOTA_ENFD);
339                         break;
340                 case Opt_qnoenforce:
341                 case Opt_uqnoenforce:
342                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
343                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
344                         break;
345                 case Opt_pquota:
346                 case Opt_prjquota:
347                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
348                                          XFS_PQUOTA_ENFD);
349                         break;
350                 case Opt_pqnoenforce:
351                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
352                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
353                         break;
354                 case Opt_gquota:
355                 case Opt_grpquota:
356                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
357                                          XFS_GQUOTA_ENFD);
358                         break;
359                 case Opt_gqnoenforce:
360                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
361                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
362                         break;
363                 case Opt_discard:
364                         mp->m_flags |= XFS_MOUNT_DISCARD;
365                         break;
366                 case Opt_nodiscard:
367                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
368                         break;
369 #ifdef CONFIG_FS_DAX
370                 case Opt_dax:
371                         mp->m_flags |= XFS_MOUNT_DAX;
372                         break;
373 #endif
374                 default:
375                         xfs_warn(mp, "unknown mount option [%s].", p);
376                         return -EINVAL;
377                 }
378         }
379 
380         /*
381          * no recovery flag requires a read-only mount
382          */
383         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
384             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
385                 xfs_warn(mp, "no-recovery mounts must be read-only.");
386                 return -EINVAL;
387         }
388 
389         if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
390                 xfs_warn(mp,
391         "sunit and swidth options incompatible with the noalign option");
392                 return -EINVAL;
393         }
394 
395 #ifndef CONFIG_XFS_QUOTA
396         if (XFS_IS_QUOTA_RUNNING(mp)) {
397                 xfs_warn(mp, "quota support not available in this kernel.");
398                 return -EINVAL;
399         }
400 #endif
401 
402         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
403                 xfs_warn(mp, "sunit and swidth must be specified together");
404                 return -EINVAL;
405         }
406 
407         if (dsunit && (dswidth % dsunit != 0)) {
408                 xfs_warn(mp,
409         "stripe width (%d) must be a multiple of the stripe unit (%d)",
410                         dswidth, dsunit);
411                 return -EINVAL;
412         }
413 
414 done:
415         if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
416                 /*
417                  * At this point the superblock has not been read
418                  * in, therefore we do not know the block size.
419                  * Before the mount call ends we will convert
420                  * these to FSBs.
421                  */
422                 mp->m_dalign = dsunit;
423                 mp->m_swidth = dswidth;
424         }
425 
426         if (mp->m_logbufs != -1 &&
427             mp->m_logbufs != 0 &&
428             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
429              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
430                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
431                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
432                 return -EINVAL;
433         }
434         if (mp->m_logbsize != -1 &&
435             mp->m_logbsize !=  0 &&
436             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
437              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
438              !is_power_of_2(mp->m_logbsize))) {
439                 xfs_warn(mp,
440                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
441                         mp->m_logbsize);
442                 return -EINVAL;
443         }
444 
445         if (iosizelog) {
446                 if (iosizelog > XFS_MAX_IO_LOG ||
447                     iosizelog < XFS_MIN_IO_LOG) {
448                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
449                                 iosizelog, XFS_MIN_IO_LOG,
450                                 XFS_MAX_IO_LOG);
451                         return -EINVAL;
452                 }
453 
454                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
455                 mp->m_readio_log = iosizelog;
456                 mp->m_writeio_log = iosizelog;
457         }
458 
459         return 0;
460 }
461 
462 struct proc_xfs_info {
463         uint64_t        flag;
464         char            *str;
465 };
466 
467 STATIC int
468 xfs_showargs(
469         struct xfs_mount        *mp,
470         struct seq_file         *m)
471 {
472         static struct proc_xfs_info xfs_info_set[] = {
473                 /* the few simple ones we can get from the mount struct */
474                 { XFS_MOUNT_IKEEP,              ",ikeep" },
475                 { XFS_MOUNT_WSYNC,              ",wsync" },
476                 { XFS_MOUNT_NOALIGN,            ",noalign" },
477                 { XFS_MOUNT_SWALLOC,            ",swalloc" },
478                 { XFS_MOUNT_NOUUID,             ",nouuid" },
479                 { XFS_MOUNT_NORECOVERY,         ",norecovery" },
480                 { XFS_MOUNT_ATTR2,              ",attr2" },
481                 { XFS_MOUNT_FILESTREAMS,        ",filestreams" },
482                 { XFS_MOUNT_GRPID,              ",grpid" },
483                 { XFS_MOUNT_DISCARD,            ",discard" },
484                 { XFS_MOUNT_SMALL_INUMS,        ",inode32" },
485                 { XFS_MOUNT_DAX,                ",dax" },
486                 { 0, NULL }
487         };
488         static struct proc_xfs_info xfs_info_unset[] = {
489                 /* the few simple ones we can get from the mount struct */
490                 { XFS_MOUNT_COMPAT_IOSIZE,      ",largeio" },
491                 { XFS_MOUNT_BARRIER,            ",nobarrier" },
492                 { XFS_MOUNT_SMALL_INUMS,        ",inode64" },
493                 { 0, NULL }
494         };
495         struct proc_xfs_info    *xfs_infop;
496 
497         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
498                 if (mp->m_flags & xfs_infop->flag)
499                         seq_puts(m, xfs_infop->str);
500         }
501         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
502                 if (!(mp->m_flags & xfs_infop->flag))
503                         seq_puts(m, xfs_infop->str);
504         }
505 
506         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
507                 seq_printf(m, ",allocsize=%dk",
508                                 (int)(1 << mp->m_writeio_log) >> 10);
509 
510         if (mp->m_logbufs > 0)
511                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
512         if (mp->m_logbsize > 0)
513                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
514 
515         if (mp->m_logname)
516                 seq_show_option(m, "logdev", mp->m_logname);
517         if (mp->m_rtname)
518                 seq_show_option(m, "rtdev", mp->m_rtname);
519 
520         if (mp->m_dalign > 0)
521                 seq_printf(m, ",sunit=%d",
522                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
523         if (mp->m_swidth > 0)
524                 seq_printf(m, ",swidth=%d",
525                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
526 
527         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
528                 seq_puts(m, ",usrquota");
529         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
530                 seq_puts(m, ",uqnoenforce");
531 
532         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
533                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
534                         seq_puts(m, ",prjquota");
535                 else
536                         seq_puts(m, ",pqnoenforce");
537         }
538         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
539                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
540                         seq_puts(m, ",grpquota");
541                 else
542                         seq_puts(m, ",gqnoenforce");
543         }
544 
545         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
546                 seq_puts(m, ",noquota");
547 
548         return 0;
549 }
550 static __uint64_t
551 xfs_max_file_offset(
552         unsigned int            blockshift)
553 {
554         unsigned int            pagefactor = 1;
555         unsigned int            bitshift = BITS_PER_LONG - 1;
556 
557         /* Figure out maximum filesize, on Linux this can depend on
558          * the filesystem blocksize (on 32 bit platforms).
559          * __block_write_begin does this in an [unsigned] long...
560          *      page->index << (PAGE_SHIFT - bbits)
561          * So, for page sized blocks (4K on 32 bit platforms),
562          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
563          *      (((u64)PAGE_SIZE << (BITS_PER_LONG-1))-1)
564          * but for smaller blocksizes it is less (bbits = log2 bsize).
565          * Note1: get_block_t takes a long (implicit cast from above)
566          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
567          * can optionally convert the [unsigned] long from above into
568          * an [unsigned] long long.
569          */
570 
571 #if BITS_PER_LONG == 32
572 # if defined(CONFIG_LBDAF)
573         ASSERT(sizeof(sector_t) == 8);
574         pagefactor = PAGE_SIZE;
575         bitshift = BITS_PER_LONG;
576 # else
577         pagefactor = PAGE_SIZE >> (PAGE_SHIFT - blockshift);
578 # endif
579 #endif
580 
581         return (((__uint64_t)pagefactor) << bitshift) - 1;
582 }
583 
584 /*
585  * Set parameters for inode allocation heuristics, taking into account
586  * filesystem size and inode32/inode64 mount options; i.e. specifically
587  * whether or not XFS_MOUNT_SMALL_INUMS is set.
588  *
589  * Inode allocation patterns are altered only if inode32 is requested
590  * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
591  * If altered, XFS_MOUNT_32BITINODES is set as well.
592  *
593  * An agcount independent of that in the mount structure is provided
594  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
595  * to the potentially higher ag count.
596  *
597  * Returns the maximum AG index which may contain inodes.
598  */
599 xfs_agnumber_t
600 xfs_set_inode_alloc(
601         struct xfs_mount *mp,
602         xfs_agnumber_t  agcount)
603 {
604         xfs_agnumber_t  index;
605         xfs_agnumber_t  maxagi = 0;
606         xfs_sb_t        *sbp = &mp->m_sb;
607         xfs_agnumber_t  max_metadata;
608         xfs_agino_t     agino;
609         xfs_ino_t       ino;
610 
611         /*
612          * Calculate how much should be reserved for inodes to meet
613          * the max inode percentage.  Used only for inode32.
614          */
615         if (mp->m_maxicount) {
616                 __uint64_t      icount;
617 
618                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
619                 do_div(icount, 100);
620                 icount += sbp->sb_agblocks - 1;
621                 do_div(icount, sbp->sb_agblocks);
622                 max_metadata = icount;
623         } else {
624                 max_metadata = agcount;
625         }
626 
627         /* Get the last possible inode in the filesystem */
628         agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
629         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
630 
631         /*
632          * If user asked for no more than 32-bit inodes, and the fs is
633          * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
634          * the allocator to accommodate the request.
635          */
636         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
637                 mp->m_flags |= XFS_MOUNT_32BITINODES;
638         else
639                 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
640 
641         for (index = 0; index < agcount; index++) {
642                 struct xfs_perag        *pag;
643 
644                 ino = XFS_AGINO_TO_INO(mp, index, agino);
645 
646                 pag = xfs_perag_get(mp, index);
647 
648                 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
649                         if (ino > XFS_MAXINUMBER_32) {
650                                 pag->pagi_inodeok = 0;
651                                 pag->pagf_metadata = 0;
652                         } else {
653                                 pag->pagi_inodeok = 1;
654                                 maxagi++;
655                                 if (index < max_metadata)
656                                         pag->pagf_metadata = 1;
657                                 else
658                                         pag->pagf_metadata = 0;
659                         }
660                 } else {
661                         pag->pagi_inodeok = 1;
662                         pag->pagf_metadata = 0;
663                 }
664 
665                 xfs_perag_put(pag);
666         }
667 
668         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
669 }
670 
671 STATIC int
672 xfs_blkdev_get(
673         xfs_mount_t             *mp,
674         const char              *name,
675         struct block_device     **bdevp)
676 {
677         int                     error = 0;
678 
679         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
680                                     mp);
681         if (IS_ERR(*bdevp)) {
682                 error = PTR_ERR(*bdevp);
683                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
684         }
685 
686         return error;
687 }
688 
689 STATIC void
690 xfs_blkdev_put(
691         struct block_device     *bdev)
692 {
693         if (bdev)
694                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
695 }
696 
697 void
698 xfs_blkdev_issue_flush(
699         xfs_buftarg_t           *buftarg)
700 {
701         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
702 }
703 
704 STATIC void
705 xfs_close_devices(
706         struct xfs_mount        *mp)
707 {
708         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
709                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
710                 xfs_free_buftarg(mp, mp->m_logdev_targp);
711                 xfs_blkdev_put(logdev);
712         }
713         if (mp->m_rtdev_targp) {
714                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
715                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
716                 xfs_blkdev_put(rtdev);
717         }
718         xfs_free_buftarg(mp, mp->m_ddev_targp);
719 }
720 
721 /*
722  * The file system configurations are:
723  *      (1) device (partition) with data and internal log
724  *      (2) logical volume with data and log subvolumes.
725  *      (3) logical volume with data, log, and realtime subvolumes.
726  *
727  * We only have to handle opening the log and realtime volumes here if
728  * they are present.  The data subvolume has already been opened by
729  * get_sb_bdev() and is stored in sb->s_bdev.
730  */
731 STATIC int
732 xfs_open_devices(
733         struct xfs_mount        *mp)
734 {
735         struct block_device     *ddev = mp->m_super->s_bdev;
736         struct block_device     *logdev = NULL, *rtdev = NULL;
737         int                     error;
738 
739         /*
740          * Open real time and log devices - order is important.
741          */
742         if (mp->m_logname) {
743                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
744                 if (error)
745                         goto out;
746         }
747 
748         if (mp->m_rtname) {
749                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
750                 if (error)
751                         goto out_close_logdev;
752 
753                 if (rtdev == ddev || rtdev == logdev) {
754                         xfs_warn(mp,
755         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
756                         error = -EINVAL;
757                         goto out_close_rtdev;
758                 }
759         }
760 
761         /*
762          * Setup xfs_mount buffer target pointers
763          */
764         error = -ENOMEM;
765         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev);
766         if (!mp->m_ddev_targp)
767                 goto out_close_rtdev;
768 
769         if (rtdev) {
770                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev);
771                 if (!mp->m_rtdev_targp)
772                         goto out_free_ddev_targ;
773         }
774 
775         if (logdev && logdev != ddev) {
776                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
777                 if (!mp->m_logdev_targp)
778                         goto out_free_rtdev_targ;
779         } else {
780                 mp->m_logdev_targp = mp->m_ddev_targp;
781         }
782 
783         return 0;
784 
785  out_free_rtdev_targ:
786         if (mp->m_rtdev_targp)
787                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
788  out_free_ddev_targ:
789         xfs_free_buftarg(mp, mp->m_ddev_targp);
790  out_close_rtdev:
791         xfs_blkdev_put(rtdev);
792  out_close_logdev:
793         if (logdev && logdev != ddev)
794                 xfs_blkdev_put(logdev);
795  out:
796         return error;
797 }
798 
799 /*
800  * Setup xfs_mount buffer target pointers based on superblock
801  */
802 STATIC int
803 xfs_setup_devices(
804         struct xfs_mount        *mp)
805 {
806         int                     error;
807 
808         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
809         if (error)
810                 return error;
811 
812         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
813                 unsigned int    log_sector_size = BBSIZE;
814 
815                 if (xfs_sb_version_hassector(&mp->m_sb))
816                         log_sector_size = mp->m_sb.sb_logsectsize;
817                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
818                                             log_sector_size);
819                 if (error)
820                         return error;
821         }
822         if (mp->m_rtdev_targp) {
823                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
824                                             mp->m_sb.sb_sectsize);
825                 if (error)
826                         return error;
827         }
828 
829         return 0;
830 }
831 
832 STATIC int
833 xfs_init_mount_workqueues(
834         struct xfs_mount        *mp)
835 {
836         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
837                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
838         if (!mp->m_buf_workqueue)
839                 goto out;
840 
841         mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
842                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
843         if (!mp->m_data_workqueue)
844                 goto out_destroy_buf;
845 
846         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
847                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
848         if (!mp->m_unwritten_workqueue)
849                 goto out_destroy_data_iodone_queue;
850 
851         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
852                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
853         if (!mp->m_cil_workqueue)
854                 goto out_destroy_unwritten;
855 
856         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
857                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
858         if (!mp->m_reclaim_workqueue)
859                 goto out_destroy_cil;
860 
861         mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
862                         WQ_MEM_RECLAIM|WQ_FREEZABLE|WQ_HIGHPRI, 0,
863                         mp->m_fsname);
864         if (!mp->m_log_workqueue)
865                 goto out_destroy_reclaim;
866 
867         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
868                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
869         if (!mp->m_eofblocks_workqueue)
870                 goto out_destroy_log;
871 
872         return 0;
873 
874 out_destroy_log:
875         destroy_workqueue(mp->m_log_workqueue);
876 out_destroy_reclaim:
877         destroy_workqueue(mp->m_reclaim_workqueue);
878 out_destroy_cil:
879         destroy_workqueue(mp->m_cil_workqueue);
880 out_destroy_unwritten:
881         destroy_workqueue(mp->m_unwritten_workqueue);
882 out_destroy_data_iodone_queue:
883         destroy_workqueue(mp->m_data_workqueue);
884 out_destroy_buf:
885         destroy_workqueue(mp->m_buf_workqueue);
886 out:
887         return -ENOMEM;
888 }
889 
890 STATIC void
891 xfs_destroy_mount_workqueues(
892         struct xfs_mount        *mp)
893 {
894         destroy_workqueue(mp->m_eofblocks_workqueue);
895         destroy_workqueue(mp->m_log_workqueue);
896         destroy_workqueue(mp->m_reclaim_workqueue);
897         destroy_workqueue(mp->m_cil_workqueue);
898         destroy_workqueue(mp->m_data_workqueue);
899         destroy_workqueue(mp->m_unwritten_workqueue);
900         destroy_workqueue(mp->m_buf_workqueue);
901 }
902 
903 /*
904  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
905  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
906  * for IO to complete so that we effectively throttle multiple callers to the
907  * rate at which IO is completing.
908  */
909 void
910 xfs_flush_inodes(
911         struct xfs_mount        *mp)
912 {
913         struct super_block      *sb = mp->m_super;
914 
915         if (down_read_trylock(&sb->s_umount)) {
916                 sync_inodes_sb(sb);
917                 up_read(&sb->s_umount);
918         }
919 }
920 
921 /* Catch misguided souls that try to use this interface on XFS */
922 STATIC struct inode *
923 xfs_fs_alloc_inode(
924         struct super_block      *sb)
925 {
926         BUG();
927         return NULL;
928 }
929 
930 /*
931  * Now that the generic code is guaranteed not to be accessing
932  * the linux inode, we can inactivate and reclaim the inode.
933  */
934 STATIC void
935 xfs_fs_destroy_inode(
936         struct inode            *inode)
937 {
938         struct xfs_inode        *ip = XFS_I(inode);
939 
940         trace_xfs_destroy_inode(ip);
941 
942         ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
943         XFS_STATS_INC(ip->i_mount, vn_rele);
944         XFS_STATS_INC(ip->i_mount, vn_remove);
945 
946         xfs_inactive(ip);
947 
948         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
949         XFS_STATS_INC(ip->i_mount, vn_reclaim);
950 
951         /*
952          * We should never get here with one of the reclaim flags already set.
953          */
954         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
955         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
956 
957         /*
958          * We always use background reclaim here because even if the
959          * inode is clean, it still may be under IO and hence we have
960          * to take the flush lock. The background reclaim path handles
961          * this more efficiently than we can here, so simply let background
962          * reclaim tear down all inodes.
963          */
964         xfs_inode_set_reclaim_tag(ip);
965 }
966 
967 /*
968  * Slab object creation initialisation for the XFS inode.
969  * This covers only the idempotent fields in the XFS inode;
970  * all other fields need to be initialised on allocation
971  * from the slab. This avoids the need to repeatedly initialise
972  * fields in the xfs inode that left in the initialise state
973  * when freeing the inode.
974  */
975 STATIC void
976 xfs_fs_inode_init_once(
977         void                    *inode)
978 {
979         struct xfs_inode        *ip = inode;
980 
981         memset(ip, 0, sizeof(struct xfs_inode));
982 
983         /* vfs inode */
984         inode_init_once(VFS_I(ip));
985 
986         /* xfs inode */
987         atomic_set(&ip->i_pincount, 0);
988         spin_lock_init(&ip->i_flags_lock);
989 
990         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
991                      "xfsino", ip->i_ino);
992         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
993                      "xfsino", ip->i_ino);
994 }
995 
996 /*
997  * We do an unlocked check for XFS_IDONTCACHE here because we are already
998  * serialised against cache hits here via the inode->i_lock and igrab() in
999  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
1000  * racing with us, and it avoids needing to grab a spinlock here for every inode
1001  * we drop the final reference on.
1002  */
1003 STATIC int
1004 xfs_fs_drop_inode(
1005         struct inode            *inode)
1006 {
1007         struct xfs_inode        *ip = XFS_I(inode);
1008 
1009         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1010 }
1011 
1012 STATIC void
1013 xfs_free_fsname(
1014         struct xfs_mount        *mp)
1015 {
1016         kfree(mp->m_fsname);
1017         kfree(mp->m_rtname);
1018         kfree(mp->m_logname);
1019 }
1020 
1021 STATIC int
1022 xfs_fs_sync_fs(
1023         struct super_block      *sb,
1024         int                     wait)
1025 {
1026         struct xfs_mount        *mp = XFS_M(sb);
1027 
1028         /*
1029          * Doing anything during the async pass would be counterproductive.
1030          */
1031         if (!wait)
1032                 return 0;
1033 
1034         xfs_log_force(mp, XFS_LOG_SYNC);
1035         if (laptop_mode) {
1036                 /*
1037                  * The disk must be active because we're syncing.
1038                  * We schedule log work now (now that the disk is
1039                  * active) instead of later (when it might not be).
1040                  */
1041                 flush_delayed_work(&mp->m_log->l_work);
1042         }
1043 
1044         return 0;
1045 }
1046 
1047 STATIC int
1048 xfs_fs_statfs(
1049         struct dentry           *dentry,
1050         struct kstatfs          *statp)
1051 {
1052         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1053         xfs_sb_t                *sbp = &mp->m_sb;
1054         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
1055         __uint64_t              fakeinos, id;
1056         __uint64_t              icount;
1057         __uint64_t              ifree;
1058         __uint64_t              fdblocks;
1059         xfs_extlen_t            lsize;
1060         __int64_t               ffree;
1061 
1062         statp->f_type = XFS_SB_MAGIC;
1063         statp->f_namelen = MAXNAMELEN - 1;
1064 
1065         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1066         statp->f_fsid.val[0] = (u32)id;
1067         statp->f_fsid.val[1] = (u32)(id >> 32);
1068 
1069         icount = percpu_counter_sum(&mp->m_icount);
1070         ifree = percpu_counter_sum(&mp->m_ifree);
1071         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1072 
1073         spin_lock(&mp->m_sb_lock);
1074         statp->f_bsize = sbp->sb_blocksize;
1075         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1076         statp->f_blocks = sbp->sb_dblocks - lsize;
1077         spin_unlock(&mp->m_sb_lock);
1078 
1079         statp->f_bfree = fdblocks - mp->m_alloc_set_aside;
1080         statp->f_bavail = statp->f_bfree;
1081 
1082         fakeinos = statp->f_bfree << sbp->sb_inopblog;
1083         statp->f_files = MIN(icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1084         if (mp->m_maxicount)
1085                 statp->f_files = min_t(typeof(statp->f_files),
1086                                         statp->f_files,
1087                                         mp->m_maxicount);
1088 
1089         /* If sb_icount overshot maxicount, report actual allocation */
1090         statp->f_files = max_t(typeof(statp->f_files),
1091                                         statp->f_files,
1092                                         sbp->sb_icount);
1093 
1094         /* make sure statp->f_ffree does not underflow */
1095         ffree = statp->f_files - (icount - ifree);
1096         statp->f_ffree = max_t(__int64_t, ffree, 0);
1097 
1098 
1099         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1100             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1101                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1102                 xfs_qm_statvfs(ip, statp);
1103         return 0;
1104 }
1105 
1106 STATIC void
1107 xfs_save_resvblks(struct xfs_mount *mp)
1108 {
1109         __uint64_t resblks = 0;
1110 
1111         mp->m_resblks_save = mp->m_resblks;
1112         xfs_reserve_blocks(mp, &resblks, NULL);
1113 }
1114 
1115 STATIC void
1116 xfs_restore_resvblks(struct xfs_mount *mp)
1117 {
1118         __uint64_t resblks;
1119 
1120         if (mp->m_resblks_save) {
1121                 resblks = mp->m_resblks_save;
1122                 mp->m_resblks_save = 0;
1123         } else
1124                 resblks = xfs_default_resblks(mp);
1125 
1126         xfs_reserve_blocks(mp, &resblks, NULL);
1127 }
1128 
1129 /*
1130  * Trigger writeback of all the dirty metadata in the file system.
1131  *
1132  * This ensures that the metadata is written to their location on disk rather
1133  * than just existing in transactions in the log. This means after a quiesce
1134  * there is no log replay required to write the inodes to disk - this is the
1135  * primary difference between a sync and a quiesce.
1136  *
1137  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1138  * it is started again when appropriate.
1139  */
1140 static void
1141 xfs_quiesce_attr(
1142         struct xfs_mount        *mp)
1143 {
1144         int     error = 0;
1145 
1146         /* wait for all modifications to complete */
1147         while (atomic_read(&mp->m_active_trans) > 0)
1148                 delay(100);
1149 
1150         /* force the log to unpin objects from the now complete transactions */
1151         xfs_log_force(mp, XFS_LOG_SYNC);
1152 
1153         /* reclaim inodes to do any IO before the freeze completes */
1154         xfs_reclaim_inodes(mp, 0);
1155         xfs_reclaim_inodes(mp, SYNC_WAIT);
1156 
1157         /* Push the superblock and write an unmount record */
1158         error = xfs_log_sbcount(mp);
1159         if (error)
1160                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1161                                 "Frozen image may not be consistent.");
1162         /*
1163          * Just warn here till VFS can correctly support
1164          * read-only remount without racing.
1165          */
1166         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1167 
1168         xfs_log_quiesce(mp);
1169 }
1170 
1171 STATIC int
1172 xfs_test_remount_options(
1173         struct super_block      *sb,
1174         struct xfs_mount        *mp,
1175         char                    *options)
1176 {
1177         int                     error = 0;
1178         struct xfs_mount        *tmp_mp;
1179 
1180         tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL);
1181         if (!tmp_mp)
1182                 return -ENOMEM;
1183 
1184         tmp_mp->m_super = sb;
1185         error = xfs_parseargs(tmp_mp, options);
1186         xfs_free_fsname(tmp_mp);
1187         kfree(tmp_mp);
1188 
1189         return error;
1190 }
1191 
1192 STATIC int
1193 xfs_fs_remount(
1194         struct super_block      *sb,
1195         int                     *flags,
1196         char                    *options)
1197 {
1198         struct xfs_mount        *mp = XFS_M(sb);
1199         xfs_sb_t                *sbp = &mp->m_sb;
1200         substring_t             args[MAX_OPT_ARGS];
1201         char                    *p;
1202         int                     error;
1203 
1204         /* First, check for complete junk; i.e. invalid options */
1205         error = xfs_test_remount_options(sb, mp, options);
1206         if (error)
1207                 return error;
1208 
1209         sync_filesystem(sb);
1210         while ((p = strsep(&options, ",")) != NULL) {
1211                 int token;
1212 
1213                 if (!*p)
1214                         continue;
1215 
1216                 token = match_token(p, tokens, args);
1217                 switch (token) {
1218                 case Opt_barrier:
1219                         mp->m_flags |= XFS_MOUNT_BARRIER;
1220                         break;
1221                 case Opt_nobarrier:
1222                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
1223                         break;
1224                 case Opt_inode64:
1225                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1226                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1227                         break;
1228                 case Opt_inode32:
1229                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1230                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1231                         break;
1232                 default:
1233                         /*
1234                          * Logically we would return an error here to prevent
1235                          * users from believing they might have changed
1236                          * mount options using remount which can't be changed.
1237                          *
1238                          * But unfortunately mount(8) adds all options from
1239                          * mtab and fstab to the mount arguments in some cases
1240                          * so we can't blindly reject options, but have to
1241                          * check for each specified option if it actually
1242                          * differs from the currently set option and only
1243                          * reject it if that's the case.
1244                          *
1245                          * Until that is implemented we return success for
1246                          * every remount request, and silently ignore all
1247                          * options that we can't actually change.
1248                          */
1249 #if 0
1250                         xfs_info(mp,
1251                 "mount option \"%s\" not supported for remount", p);
1252                         return -EINVAL;
1253 #else
1254                         break;
1255 #endif
1256                 }
1257         }
1258 
1259         /* ro -> rw */
1260         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1261                 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1262                         xfs_warn(mp,
1263                 "ro->rw transition prohibited on norecovery mount");
1264                         return -EINVAL;
1265                 }
1266 
1267                 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1268                     xfs_sb_has_ro_compat_feature(sbp,
1269                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1270                         xfs_warn(mp,
1271 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1272                                 (sbp->sb_features_ro_compat &
1273                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1274                         return -EINVAL;
1275                 }
1276 
1277                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1278 
1279                 /*
1280                  * If this is the first remount to writeable state we
1281                  * might have some superblock changes to update.
1282                  */
1283                 if (mp->m_update_sb) {
1284                         error = xfs_sync_sb(mp, false);
1285                         if (error) {
1286                                 xfs_warn(mp, "failed to write sb changes");
1287                                 return error;
1288                         }
1289                         mp->m_update_sb = false;
1290                 }
1291 
1292                 /*
1293                  * Fill out the reserve pool if it is empty. Use the stashed
1294                  * value if it is non-zero, otherwise go with the default.
1295                  */
1296                 xfs_restore_resvblks(mp);
1297                 xfs_log_work_queue(mp);
1298                 xfs_queue_eofblocks(mp);
1299         }
1300 
1301         /* rw -> ro */
1302         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1303                 /*
1304                  * Before we sync the metadata, we need to free up the reserve
1305                  * block pool so that the used block count in the superblock on
1306                  * disk is correct at the end of the remount. Stash the current
1307                  * reserve pool size so that if we get remounted rw, we can
1308                  * return it to the same size.
1309                  */
1310                 xfs_save_resvblks(mp);
1311 
1312                 /*
1313                  * Cancel background eofb scanning so it cannot race with the
1314                  * final log force+buftarg wait and deadlock the remount.
1315                  */
1316                 cancel_delayed_work_sync(&mp->m_eofblocks_work);
1317 
1318                 xfs_quiesce_attr(mp);
1319                 mp->m_flags |= XFS_MOUNT_RDONLY;
1320         }
1321 
1322         return 0;
1323 }
1324 
1325 /*
1326  * Second stage of a freeze. The data is already frozen so we only
1327  * need to take care of the metadata. Once that's done sync the superblock
1328  * to the log to dirty it in case of a crash while frozen. This ensures that we
1329  * will recover the unlinked inode lists on the next mount.
1330  */
1331 STATIC int
1332 xfs_fs_freeze(
1333         struct super_block      *sb)
1334 {
1335         struct xfs_mount        *mp = XFS_M(sb);
1336 
1337         xfs_save_resvblks(mp);
1338         xfs_quiesce_attr(mp);
1339         return xfs_sync_sb(mp, true);
1340 }
1341 
1342 STATIC int
1343 xfs_fs_unfreeze(
1344         struct super_block      *sb)
1345 {
1346         struct xfs_mount        *mp = XFS_M(sb);
1347 
1348         xfs_restore_resvblks(mp);
1349         xfs_log_work_queue(mp);
1350         return 0;
1351 }
1352 
1353 STATIC int
1354 xfs_fs_show_options(
1355         struct seq_file         *m,
1356         struct dentry           *root)
1357 {
1358         return xfs_showargs(XFS_M(root->d_sb), m);
1359 }
1360 
1361 /*
1362  * This function fills in xfs_mount_t fields based on mount args.
1363  * Note: the superblock _has_ now been read in.
1364  */
1365 STATIC int
1366 xfs_finish_flags(
1367         struct xfs_mount        *mp)
1368 {
1369         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1370 
1371         /* Fail a mount where the logbuf is smaller than the log stripe */
1372         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1373                 if (mp->m_logbsize <= 0 &&
1374                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1375                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1376                 } else if (mp->m_logbsize > 0 &&
1377                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1378                         xfs_warn(mp,
1379                 "logbuf size must be greater than or equal to log stripe size");
1380                         return -EINVAL;
1381                 }
1382         } else {
1383                 /* Fail a mount if the logbuf is larger than 32K */
1384                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1385                         xfs_warn(mp,
1386                 "logbuf size for version 1 logs must be 16K or 32K");
1387                         return -EINVAL;
1388                 }
1389         }
1390 
1391         /*
1392          * V5 filesystems always use attr2 format for attributes.
1393          */
1394         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1395             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1396                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
1397                              "attr2 is always enabled for V5 filesystems.");
1398                 return -EINVAL;
1399         }
1400 
1401         /*
1402          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1403          * told by noattr2 to turn it off
1404          */
1405         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1406             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1407                 mp->m_flags |= XFS_MOUNT_ATTR2;
1408 
1409         /*
1410          * prohibit r/w mounts of read-only filesystems
1411          */
1412         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1413                 xfs_warn(mp,
1414                         "cannot mount a read-only filesystem as read-write");
1415                 return -EROFS;
1416         }
1417 
1418         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1419             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1420             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1421                 xfs_warn(mp,
1422                   "Super block does not support project and group quota together");
1423                 return -EINVAL;
1424         }
1425 
1426         return 0;
1427 }
1428 
1429 static int
1430 xfs_init_percpu_counters(
1431         struct xfs_mount        *mp)
1432 {
1433         int             error;
1434 
1435         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1436         if (error)
1437                 return -ENOMEM;
1438 
1439         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1440         if (error)
1441                 goto free_icount;
1442 
1443         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1444         if (error)
1445                 goto free_ifree;
1446 
1447         return 0;
1448 
1449 free_ifree:
1450         percpu_counter_destroy(&mp->m_ifree);
1451 free_icount:
1452         percpu_counter_destroy(&mp->m_icount);
1453         return -ENOMEM;
1454 }
1455 
1456 void
1457 xfs_reinit_percpu_counters(
1458         struct xfs_mount        *mp)
1459 {
1460         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1461         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1462         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1463 }
1464 
1465 static void
1466 xfs_destroy_percpu_counters(
1467         struct xfs_mount        *mp)
1468 {
1469         percpu_counter_destroy(&mp->m_icount);
1470         percpu_counter_destroy(&mp->m_ifree);
1471         percpu_counter_destroy(&mp->m_fdblocks);
1472 }
1473 
1474 STATIC int
1475 xfs_fs_fill_super(
1476         struct super_block      *sb,
1477         void                    *data,
1478         int                     silent)
1479 {
1480         struct inode            *root;
1481         struct xfs_mount        *mp = NULL;
1482         int                     flags = 0, error = -ENOMEM;
1483 
1484         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1485         if (!mp)
1486                 goto out;
1487 
1488         spin_lock_init(&mp->m_sb_lock);
1489         mutex_init(&mp->m_growlock);
1490         atomic_set(&mp->m_active_trans, 0);
1491         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1492         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1493         mp->m_kobj.kobject.kset = xfs_kset;
1494 
1495         mp->m_super = sb;
1496         sb->s_fs_info = mp;
1497 
1498         error = xfs_parseargs(mp, (char *)data);
1499         if (error)
1500                 goto out_free_fsname;
1501 
1502         sb_min_blocksize(sb, BBSIZE);
1503         sb->s_xattr = xfs_xattr_handlers;
1504         sb->s_export_op = &xfs_export_operations;
1505 #ifdef CONFIG_XFS_QUOTA
1506         sb->s_qcop = &xfs_quotactl_operations;
1507         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1508 #endif
1509         sb->s_op = &xfs_super_operations;
1510 
1511         if (silent)
1512                 flags |= XFS_MFSI_QUIET;
1513 
1514         error = xfs_open_devices(mp);
1515         if (error)
1516                 goto out_free_fsname;
1517 
1518         error = xfs_init_mount_workqueues(mp);
1519         if (error)
1520                 goto out_close_devices;
1521 
1522         error = xfs_init_percpu_counters(mp);
1523         if (error)
1524                 goto out_destroy_workqueues;
1525 
1526         /* Allocate stats memory before we do operations that might use it */
1527         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1528         if (!mp->m_stats.xs_stats) {
1529                 error = -ENOMEM;
1530                 goto out_destroy_counters;
1531         }
1532 
1533         error = xfs_readsb(mp, flags);
1534         if (error)
1535                 goto out_free_stats;
1536 
1537         error = xfs_finish_flags(mp);
1538         if (error)
1539                 goto out_free_sb;
1540 
1541         error = xfs_setup_devices(mp);
1542         if (error)
1543                 goto out_free_sb;
1544 
1545         error = xfs_filestream_mount(mp);
1546         if (error)
1547                 goto out_free_sb;
1548 
1549         /*
1550          * we must configure the block size in the superblock before we run the
1551          * full mount process as the mount process can lookup and cache inodes.
1552          */
1553         sb->s_magic = XFS_SB_MAGIC;
1554         sb->s_blocksize = mp->m_sb.sb_blocksize;
1555         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1556         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1557         sb->s_max_links = XFS_MAXLINK;
1558         sb->s_time_gran = 1;
1559         set_posix_acl_flag(sb);
1560 
1561         /* version 5 superblocks support inode version counters. */
1562         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1563                 sb->s_flags |= MS_I_VERSION;
1564 
1565         if (mp->m_flags & XFS_MOUNT_DAX) {
1566                 xfs_warn(mp,
1567                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1568 
1569                 error = bdev_dax_supported(sb, sb->s_blocksize);
1570                 if (error) {
1571                         xfs_alert(mp,
1572                         "DAX unsupported by block device. Turning off DAX.");
1573                         mp->m_flags &= ~XFS_MOUNT_DAX;
1574                 }
1575         }
1576 
1577         if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
1578                 if (mp->m_sb.sb_rblocks) {
1579                         xfs_alert(mp,
1580         "EXPERIMENTAL reverse mapping btree not compatible with realtime device!");
1581                         error = -EINVAL;
1582                         goto out_filestream_unmount;
1583                 }
1584                 xfs_alert(mp,
1585         "EXPERIMENTAL reverse mapping btree feature enabled. Use at your own risk!");
1586         }
1587 
1588         error = xfs_mountfs(mp);
1589         if (error)
1590                 goto out_filestream_unmount;
1591 
1592         root = igrab(VFS_I(mp->m_rootip));
1593         if (!root) {
1594                 error = -ENOENT;
1595                 goto out_unmount;
1596         }
1597         sb->s_root = d_make_root(root);
1598         if (!sb->s_root) {
1599                 error = -ENOMEM;
1600                 goto out_unmount;
1601         }
1602 
1603         return 0;
1604 
1605  out_filestream_unmount:
1606         xfs_filestream_unmount(mp);
1607  out_free_sb:
1608         xfs_freesb(mp);
1609  out_free_stats:
1610         free_percpu(mp->m_stats.xs_stats);
1611  out_destroy_counters:
1612         xfs_destroy_percpu_counters(mp);
1613  out_destroy_workqueues:
1614         xfs_destroy_mount_workqueues(mp);
1615  out_close_devices:
1616         xfs_close_devices(mp);
1617  out_free_fsname:
1618         xfs_free_fsname(mp);
1619         kfree(mp);
1620  out:
1621         return error;
1622 
1623  out_unmount:
1624         xfs_filestream_unmount(mp);
1625         xfs_unmountfs(mp);
1626         goto out_free_sb;
1627 }
1628 
1629 STATIC void
1630 xfs_fs_put_super(
1631         struct super_block      *sb)
1632 {
1633         struct xfs_mount        *mp = XFS_M(sb);
1634 
1635         xfs_notice(mp, "Unmounting Filesystem");
1636         xfs_filestream_unmount(mp);
1637         xfs_unmountfs(mp);
1638 
1639         xfs_freesb(mp);
1640         free_percpu(mp->m_stats.xs_stats);
1641         xfs_destroy_percpu_counters(mp);
1642         xfs_destroy_mount_workqueues(mp);
1643         xfs_close_devices(mp);
1644         xfs_free_fsname(mp);
1645         kfree(mp);
1646 }
1647 
1648 STATIC struct dentry *
1649 xfs_fs_mount(
1650         struct file_system_type *fs_type,
1651         int                     flags,
1652         const char              *dev_name,
1653         void                    *data)
1654 {
1655         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1656 }
1657 
1658 static long
1659 xfs_fs_nr_cached_objects(
1660         struct super_block      *sb,
1661         struct shrink_control   *sc)
1662 {
1663         return xfs_reclaim_inodes_count(XFS_M(sb));
1664 }
1665 
1666 static long
1667 xfs_fs_free_cached_objects(
1668         struct super_block      *sb,
1669         struct shrink_control   *sc)
1670 {
1671         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1672 }
1673 
1674 static const struct super_operations xfs_super_operations = {
1675         .alloc_inode            = xfs_fs_alloc_inode,
1676         .destroy_inode          = xfs_fs_destroy_inode,
1677         .drop_inode             = xfs_fs_drop_inode,
1678         .put_super              = xfs_fs_put_super,
1679         .sync_fs                = xfs_fs_sync_fs,
1680         .freeze_fs              = xfs_fs_freeze,
1681         .unfreeze_fs            = xfs_fs_unfreeze,
1682         .statfs                 = xfs_fs_statfs,
1683         .remount_fs             = xfs_fs_remount,
1684         .show_options           = xfs_fs_show_options,
1685         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1686         .free_cached_objects    = xfs_fs_free_cached_objects,
1687 };
1688 
1689 static struct file_system_type xfs_fs_type = {
1690         .owner                  = THIS_MODULE,
1691         .name                   = "xfs",
1692         .mount                  = xfs_fs_mount,
1693         .kill_sb                = kill_block_super,
1694         .fs_flags               = FS_REQUIRES_DEV,
1695 };
1696 MODULE_ALIAS_FS("xfs");
1697 
1698 STATIC int __init
1699 xfs_init_zones(void)
1700 {
1701         xfs_ioend_bioset = bioset_create(4 * MAX_BUF_PER_PAGE,
1702                         offsetof(struct xfs_ioend, io_inline_bio));
1703         if (!xfs_ioend_bioset)
1704                 goto out;
1705 
1706         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1707                                                 "xfs_log_ticket");
1708         if (!xfs_log_ticket_zone)
1709                 goto out_free_ioend_bioset;
1710 
1711         xfs_bmap_free_item_zone = kmem_zone_init(
1712                         sizeof(struct xfs_extent_free_item),
1713                         "xfs_bmap_free_item");
1714         if (!xfs_bmap_free_item_zone)
1715                 goto out_destroy_log_ticket_zone;
1716 
1717         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1718                                                 "xfs_btree_cur");
1719         if (!xfs_btree_cur_zone)
1720                 goto out_destroy_bmap_free_item_zone;
1721 
1722         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1723                                                 "xfs_da_state");
1724         if (!xfs_da_state_zone)
1725                 goto out_destroy_btree_cur_zone;
1726 
1727         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1728         if (!xfs_ifork_zone)
1729                 goto out_destroy_da_state_zone;
1730 
1731         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1732         if (!xfs_trans_zone)
1733                 goto out_destroy_ifork_zone;
1734 
1735         xfs_log_item_desc_zone =
1736                 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1737                                "xfs_log_item_desc");
1738         if (!xfs_log_item_desc_zone)
1739                 goto out_destroy_trans_zone;
1740 
1741         /*
1742          * The size of the zone allocated buf log item is the maximum
1743          * size possible under XFS.  This wastes a little bit of memory,
1744          * but it is much faster.
1745          */
1746         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1747                                            "xfs_buf_item");
1748         if (!xfs_buf_item_zone)
1749                 goto out_destroy_log_item_desc_zone;
1750 
1751         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1752                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1753                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1754         if (!xfs_efd_zone)
1755                 goto out_destroy_buf_item_zone;
1756 
1757         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1758                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1759                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1760         if (!xfs_efi_zone)
1761                 goto out_destroy_efd_zone;
1762 
1763         xfs_inode_zone =
1764                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1765                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD |
1766                         KM_ZONE_ACCOUNT, xfs_fs_inode_init_once);
1767         if (!xfs_inode_zone)
1768                 goto out_destroy_efi_zone;
1769 
1770         xfs_ili_zone =
1771                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1772                                         KM_ZONE_SPREAD, NULL);
1773         if (!xfs_ili_zone)
1774                 goto out_destroy_inode_zone;
1775         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1776                                         "xfs_icr");
1777         if (!xfs_icreate_zone)
1778                 goto out_destroy_ili_zone;
1779 
1780         xfs_rud_zone = kmem_zone_init(sizeof(struct xfs_rud_log_item),
1781                         "xfs_rud_item");
1782         if (!xfs_rud_zone)
1783                 goto out_destroy_icreate_zone;
1784 
1785         xfs_rui_zone = kmem_zone_init((sizeof(struct xfs_rui_log_item) +
1786                         ((XFS_RUI_MAX_FAST_EXTENTS - 1) *
1787                                 sizeof(struct xfs_map_extent))),
1788                         "xfs_rui_item");
1789         if (!xfs_rui_zone)
1790                 goto out_destroy_rud_zone;
1791 
1792         return 0;
1793 
1794  out_destroy_rud_zone:
1795         kmem_zone_destroy(xfs_rud_zone);
1796  out_destroy_icreate_zone:
1797         kmem_zone_destroy(xfs_icreate_zone);
1798  out_destroy_ili_zone:
1799         kmem_zone_destroy(xfs_ili_zone);
1800  out_destroy_inode_zone:
1801         kmem_zone_destroy(xfs_inode_zone);
1802  out_destroy_efi_zone:
1803         kmem_zone_destroy(xfs_efi_zone);
1804  out_destroy_efd_zone:
1805         kmem_zone_destroy(xfs_efd_zone);
1806  out_destroy_buf_item_zone:
1807         kmem_zone_destroy(xfs_buf_item_zone);
1808  out_destroy_log_item_desc_zone:
1809         kmem_zone_destroy(xfs_log_item_desc_zone);
1810  out_destroy_trans_zone:
1811         kmem_zone_destroy(xfs_trans_zone);
1812  out_destroy_ifork_zone:
1813         kmem_zone_destroy(xfs_ifork_zone);
1814  out_destroy_da_state_zone:
1815         kmem_zone_destroy(xfs_da_state_zone);
1816  out_destroy_btree_cur_zone:
1817         kmem_zone_destroy(xfs_btree_cur_zone);
1818  out_destroy_bmap_free_item_zone:
1819         kmem_zone_destroy(xfs_bmap_free_item_zone);
1820  out_destroy_log_ticket_zone:
1821         kmem_zone_destroy(xfs_log_ticket_zone);
1822  out_free_ioend_bioset:
1823         bioset_free(xfs_ioend_bioset);
1824  out:
1825         return -ENOMEM;
1826 }
1827 
1828 STATIC void
1829 xfs_destroy_zones(void)
1830 {
1831         /*
1832          * Make sure all delayed rcu free are flushed before we
1833          * destroy caches.
1834          */
1835         rcu_barrier();
1836         kmem_zone_destroy(xfs_rui_zone);
1837         kmem_zone_destroy(xfs_rud_zone);
1838         kmem_zone_destroy(xfs_icreate_zone);
1839         kmem_zone_destroy(xfs_ili_zone);
1840         kmem_zone_destroy(xfs_inode_zone);
1841         kmem_zone_destroy(xfs_efi_zone);
1842         kmem_zone_destroy(xfs_efd_zone);
1843         kmem_zone_destroy(xfs_buf_item_zone);
1844         kmem_zone_destroy(xfs_log_item_desc_zone);
1845         kmem_zone_destroy(xfs_trans_zone);
1846         kmem_zone_destroy(xfs_ifork_zone);
1847         kmem_zone_destroy(xfs_da_state_zone);
1848         kmem_zone_destroy(xfs_btree_cur_zone);
1849         kmem_zone_destroy(xfs_bmap_free_item_zone);
1850         kmem_zone_destroy(xfs_log_ticket_zone);
1851         bioset_free(xfs_ioend_bioset);
1852 }
1853 
1854 STATIC int __init
1855 xfs_init_workqueues(void)
1856 {
1857         /*
1858          * The allocation workqueue can be used in memory reclaim situations
1859          * (writepage path), and parallelism is only limited by the number of
1860          * AGs in all the filesystems mounted. Hence use the default large
1861          * max_active value for this workqueue.
1862          */
1863         xfs_alloc_wq = alloc_workqueue("xfsalloc",
1864                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
1865         if (!xfs_alloc_wq)
1866                 return -ENOMEM;
1867 
1868         return 0;
1869 }
1870 
1871 STATIC void
1872 xfs_destroy_workqueues(void)
1873 {
1874         destroy_workqueue(xfs_alloc_wq);
1875 }
1876 
1877 STATIC int __init
1878 init_xfs_fs(void)
1879 {
1880         int                     error;
1881 
1882         xfs_check_ondisk_structs();
1883 
1884         printk(KERN_INFO XFS_VERSION_STRING " with "
1885                          XFS_BUILD_OPTIONS " enabled\n");
1886 
1887         xfs_extent_free_init_defer_op();
1888         xfs_rmap_update_init_defer_op();
1889 
1890         xfs_dir_startup();
1891 
1892         error = xfs_init_zones();
1893         if (error)
1894                 goto out;
1895 
1896         error = xfs_init_workqueues();
1897         if (error)
1898                 goto out_destroy_zones;
1899 
1900         error = xfs_mru_cache_init();
1901         if (error)
1902                 goto out_destroy_wq;
1903 
1904         error = xfs_buf_init();
1905         if (error)
1906                 goto out_mru_cache_uninit;
1907 
1908         error = xfs_init_procfs();
1909         if (error)
1910                 goto out_buf_terminate;
1911 
1912         error = xfs_sysctl_register();
1913         if (error)
1914                 goto out_cleanup_procfs;
1915 
1916         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
1917         if (!xfs_kset) {
1918                 error = -ENOMEM;
1919                 goto out_sysctl_unregister;
1920         }
1921 
1922         xfsstats.xs_kobj.kobject.kset = xfs_kset;
1923 
1924         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
1925         if (!xfsstats.xs_stats) {
1926                 error = -ENOMEM;
1927                 goto out_kset_unregister;
1928         }
1929 
1930         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
1931                                "stats");
1932         if (error)
1933                 goto out_free_stats;
1934 
1935 #ifdef DEBUG
1936         xfs_dbg_kobj.kobject.kset = xfs_kset;
1937         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
1938         if (error)
1939                 goto out_remove_stats_kobj;
1940 #endif
1941 
1942         error = xfs_qm_init();
1943         if (error)
1944                 goto out_remove_dbg_kobj;
1945 
1946         error = register_filesystem(&xfs_fs_type);
1947         if (error)
1948                 goto out_qm_exit;
1949         return 0;
1950 
1951  out_qm_exit:
1952         xfs_qm_exit();
1953  out_remove_dbg_kobj:
1954 #ifdef DEBUG
1955         xfs_sysfs_del(&xfs_dbg_kobj);
1956  out_remove_stats_kobj:
1957 #endif
1958         xfs_sysfs_del(&xfsstats.xs_kobj);
1959  out_free_stats:
1960         free_percpu(xfsstats.xs_stats);
1961  out_kset_unregister:
1962         kset_unregister(xfs_kset);
1963  out_sysctl_unregister:
1964         xfs_sysctl_unregister();
1965  out_cleanup_procfs:
1966         xfs_cleanup_procfs();
1967  out_buf_terminate:
1968         xfs_buf_terminate();
1969  out_mru_cache_uninit:
1970         xfs_mru_cache_uninit();
1971  out_destroy_wq:
1972         xfs_destroy_workqueues();
1973  out_destroy_zones:
1974         xfs_destroy_zones();
1975  out:
1976         return error;
1977 }
1978 
1979 STATIC void __exit
1980 exit_xfs_fs(void)
1981 {
1982         xfs_qm_exit();
1983         unregister_filesystem(&xfs_fs_type);
1984 #ifdef DEBUG
1985         xfs_sysfs_del(&xfs_dbg_kobj);
1986 #endif
1987         xfs_sysfs_del(&xfsstats.xs_kobj);
1988         free_percpu(xfsstats.xs_stats);
1989         kset_unregister(xfs_kset);
1990         xfs_sysctl_unregister();
1991         xfs_cleanup_procfs();
1992         xfs_buf_terminate();
1993         xfs_mru_cache_uninit();
1994         xfs_destroy_workqueues();
1995         xfs_destroy_zones();
1996         xfs_uuid_table_free();
1997 }
1998 
1999 module_init(init_xfs_fs);
2000 module_exit(exit_xfs_fs);
2001 
2002 MODULE_AUTHOR("Silicon Graphics, Inc.");
2003 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2004 MODULE_LICENSE("GPL");
2005 

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