Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

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_inum.h"
 25 #include "xfs_sb.h"
 26 #include "xfs_ag.h"
 27 #include "xfs_mount.h"
 28 #include "xfs_da_format.h"
 29 #include "xfs_inode.h"
 30 #include "xfs_btree.h"
 31 #include "xfs_bmap.h"
 32 #include "xfs_alloc.h"
 33 #include "xfs_error.h"
 34 #include "xfs_fsops.h"
 35 #include "xfs_trans.h"
 36 #include "xfs_buf_item.h"
 37 #include "xfs_log.h"
 38 #include "xfs_log_priv.h"
 39 #include "xfs_da_btree.h"
 40 #include "xfs_dir2.h"
 41 #include "xfs_extfree_item.h"
 42 #include "xfs_mru_cache.h"
 43 #include "xfs_inode_item.h"
 44 #include "xfs_icache.h"
 45 #include "xfs_trace.h"
 46 #include "xfs_icreate_item.h"
 47 #include "xfs_dinode.h"
 48 #include "xfs_filestream.h"
 49 #include "xfs_quota.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 static kmem_zone_t *xfs_ioend_zone;
 63 mempool_t *xfs_ioend_pool;
 64 
 65 #define MNTOPT_LOGBUFS  "logbufs"       /* number of XFS log buffers */
 66 #define MNTOPT_LOGBSIZE "logbsize"      /* size of XFS log buffers */
 67 #define MNTOPT_LOGDEV   "logdev"        /* log device */
 68 #define MNTOPT_RTDEV    "rtdev"         /* realtime I/O device */
 69 #define MNTOPT_BIOSIZE  "biosize"       /* log2 of preferred buffered io size */
 70 #define MNTOPT_WSYNC    "wsync"         /* safe-mode nfs compatible mount */
 71 #define MNTOPT_NOALIGN  "noalign"       /* turn off stripe alignment */
 72 #define MNTOPT_SWALLOC  "swalloc"       /* turn on stripe width allocation */
 73 #define MNTOPT_SUNIT    "sunit"         /* data volume stripe unit */
 74 #define MNTOPT_SWIDTH   "swidth"        /* data volume stripe width */
 75 #define MNTOPT_NOUUID   "nouuid"        /* ignore filesystem UUID */
 76 #define MNTOPT_MTPT     "mtpt"          /* filesystem mount point */
 77 #define MNTOPT_GRPID    "grpid"         /* group-ID from parent directory */
 78 #define MNTOPT_NOGRPID  "nogrpid"       /* group-ID from current process */
 79 #define MNTOPT_BSDGROUPS    "bsdgroups"    /* group-ID from parent directory */
 80 #define MNTOPT_SYSVGROUPS   "sysvgroups"   /* group-ID from current process */
 81 #define MNTOPT_ALLOCSIZE    "allocsize"    /* preferred allocation size */
 82 #define MNTOPT_NORECOVERY   "norecovery"   /* don't run XFS recovery */
 83 #define MNTOPT_BARRIER  "barrier"       /* use writer barriers for log write and
 84                                          * unwritten extent conversion */
 85 #define MNTOPT_NOBARRIER "nobarrier"    /* .. disable */
 86 #define MNTOPT_64BITINODE   "inode64"   /* inodes can be allocated anywhere */
 87 #define MNTOPT_32BITINODE   "inode32"   /* inode allocation limited to
 88                                          * XFS_MAXINUMBER_32 */
 89 #define MNTOPT_IKEEP    "ikeep"         /* do not free empty inode clusters */
 90 #define MNTOPT_NOIKEEP  "noikeep"       /* free empty inode clusters */
 91 #define MNTOPT_LARGEIO     "largeio"    /* report large I/O sizes in stat() */
 92 #define MNTOPT_NOLARGEIO   "nolargeio"  /* do not report large I/O sizes
 93                                          * in stat(). */
 94 #define MNTOPT_ATTR2    "attr2"         /* do use attr2 attribute format */
 95 #define MNTOPT_NOATTR2  "noattr2"       /* do not use attr2 attribute format */
 96 #define MNTOPT_FILESTREAM  "filestreams" /* use filestreams allocator */
 97 #define MNTOPT_QUOTA    "quota"         /* disk quotas (user) */
 98 #define MNTOPT_NOQUOTA  "noquota"       /* no quotas */
 99 #define MNTOPT_USRQUOTA "usrquota"      /* user quota enabled */
100 #define MNTOPT_GRPQUOTA "grpquota"      /* group quota enabled */
101 #define MNTOPT_PRJQUOTA "prjquota"      /* project quota enabled */
102 #define MNTOPT_UQUOTA   "uquota"        /* user quota (IRIX variant) */
103 #define MNTOPT_GQUOTA   "gquota"        /* group quota (IRIX variant) */
104 #define MNTOPT_PQUOTA   "pquota"        /* project quota (IRIX variant) */
105 #define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */
106 #define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */
107 #define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */
108 #define MNTOPT_QUOTANOENF  "qnoenforce" /* same as uqnoenforce */
109 #define MNTOPT_DELAYLOG    "delaylog"   /* Delayed logging enabled */
110 #define MNTOPT_NODELAYLOG  "nodelaylog" /* Delayed logging disabled */
111 #define MNTOPT_DISCARD     "discard"    /* Discard unused blocks */
112 #define MNTOPT_NODISCARD   "nodiscard"  /* Do not discard unused blocks */
113 
114 /*
115  * Table driven mount option parser.
116  *
117  * Currently only used for remount, but it will be used for mount
118  * in the future, too.
119  */
120 enum {
121         Opt_barrier,
122         Opt_nobarrier,
123         Opt_inode64,
124         Opt_inode32,
125         Opt_err
126 };
127 
128 static const match_table_t tokens = {
129         {Opt_barrier, "barrier"},
130         {Opt_nobarrier, "nobarrier"},
131         {Opt_inode64, "inode64"},
132         {Opt_inode32, "inode32"},
133         {Opt_err, NULL}
134 };
135 
136 
137 STATIC unsigned long
138 suffix_kstrtoint(char *s, unsigned int base, int *res)
139 {
140         int     last, shift_left_factor = 0, _res;
141         char    *value = s;
142 
143         last = strlen(value) - 1;
144         if (value[last] == 'K' || value[last] == 'k') {
145                 shift_left_factor = 10;
146                 value[last] = '\0';
147         }
148         if (value[last] == 'M' || value[last] == 'm') {
149                 shift_left_factor = 20;
150                 value[last] = '\0';
151         }
152         if (value[last] == 'G' || value[last] == 'g') {
153                 shift_left_factor = 30;
154                 value[last] = '\0';
155         }
156 
157         if (kstrtoint(s, base, &_res))
158                 return -EINVAL;
159         *res = _res << shift_left_factor;
160         return 0;
161 }
162 
163 /*
164  * This function fills in xfs_mount_t fields based on mount args.
165  * Note: the superblock has _not_ yet been read in.
166  *
167  * Note that this function leaks the various device name allocations on
168  * failure.  The caller takes care of them.
169  */
170 STATIC int
171 xfs_parseargs(
172         struct xfs_mount        *mp,
173         char                    *options)
174 {
175         struct super_block      *sb = mp->m_super;
176         char                    *this_char, *value;
177         int                     dsunit = 0;
178         int                     dswidth = 0;
179         int                     iosize = 0;
180         __uint8_t               iosizelog = 0;
181 
182         /*
183          * set up the mount name first so all the errors will refer to the
184          * correct device.
185          */
186         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
187         if (!mp->m_fsname)
188                 return ENOMEM;
189         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
190 
191         /*
192          * Copy binary VFS mount flags we are interested in.
193          */
194         if (sb->s_flags & MS_RDONLY)
195                 mp->m_flags |= XFS_MOUNT_RDONLY;
196         if (sb->s_flags & MS_DIRSYNC)
197                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
198         if (sb->s_flags & MS_SYNCHRONOUS)
199                 mp->m_flags |= XFS_MOUNT_WSYNC;
200 
201         /*
202          * Set some default flags that could be cleared by the mount option
203          * parsing.
204          */
205         mp->m_flags |= XFS_MOUNT_BARRIER;
206         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
207 #if !XFS_BIG_INUMS
208         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
209 #endif
210 
211         /*
212          * These can be overridden by the mount option parsing.
213          */
214         mp->m_logbufs = -1;
215         mp->m_logbsize = -1;
216 
217         if (!options)
218                 goto done;
219 
220         while ((this_char = strsep(&options, ",")) != NULL) {
221                 if (!*this_char)
222                         continue;
223                 if ((value = strchr(this_char, '=')) != NULL)
224                         *value++ = 0;
225 
226                 if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
227                         if (!value || !*value) {
228                                 xfs_warn(mp, "%s option requires an argument",
229                                         this_char);
230                                 return EINVAL;
231                         }
232                         if (kstrtoint(value, 10, &mp->m_logbufs))
233                                 return EINVAL;
234                 } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
235                         if (!value || !*value) {
236                                 xfs_warn(mp, "%s option requires an argument",
237                                         this_char);
238                                 return EINVAL;
239                         }
240                         if (suffix_kstrtoint(value, 10, &mp->m_logbsize))
241                                 return EINVAL;
242                 } else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
243                         if (!value || !*value) {
244                                 xfs_warn(mp, "%s option requires an argument",
245                                         this_char);
246                                 return EINVAL;
247                         }
248                         mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
249                         if (!mp->m_logname)
250                                 return ENOMEM;
251                 } else if (!strcmp(this_char, MNTOPT_MTPT)) {
252                         xfs_warn(mp, "%s option not allowed on this system",
253                                 this_char);
254                         return EINVAL;
255                 } else if (!strcmp(this_char, MNTOPT_RTDEV)) {
256                         if (!value || !*value) {
257                                 xfs_warn(mp, "%s option requires an argument",
258                                         this_char);
259                                 return EINVAL;
260                         }
261                         mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
262                         if (!mp->m_rtname)
263                                 return ENOMEM;
264                 } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
265                         if (!value || !*value) {
266                                 xfs_warn(mp, "%s option requires an argument",
267                                         this_char);
268                                 return EINVAL;
269                         }
270                         if (kstrtoint(value, 10, &iosize))
271                                 return EINVAL;
272                         iosizelog = ffs(iosize) - 1;
273                 } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
274                         if (!value || !*value) {
275                                 xfs_warn(mp, "%s option requires an argument",
276                                         this_char);
277                                 return EINVAL;
278                         }
279                         if (suffix_kstrtoint(value, 10, &iosize))
280                                 return EINVAL;
281                         iosizelog = ffs(iosize) - 1;
282                 } else if (!strcmp(this_char, MNTOPT_GRPID) ||
283                            !strcmp(this_char, MNTOPT_BSDGROUPS)) {
284                         mp->m_flags |= XFS_MOUNT_GRPID;
285                 } else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
286                            !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
287                         mp->m_flags &= ~XFS_MOUNT_GRPID;
288                 } else if (!strcmp(this_char, MNTOPT_WSYNC)) {
289                         mp->m_flags |= XFS_MOUNT_WSYNC;
290                 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
291                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
292                 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
293                         mp->m_flags |= XFS_MOUNT_NOALIGN;
294                 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
295                         mp->m_flags |= XFS_MOUNT_SWALLOC;
296                 } else if (!strcmp(this_char, MNTOPT_SUNIT)) {
297                         if (!value || !*value) {
298                                 xfs_warn(mp, "%s option requires an argument",
299                                         this_char);
300                                 return EINVAL;
301                         }
302                         if (kstrtoint(value, 10, &dsunit))
303                                 return EINVAL;
304                 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
305                         if (!value || !*value) {
306                                 xfs_warn(mp, "%s option requires an argument",
307                                         this_char);
308                                 return EINVAL;
309                         }
310                         if (kstrtoint(value, 10, &dswidth))
311                                 return EINVAL;
312                 } else if (!strcmp(this_char, MNTOPT_32BITINODE)) {
313                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
314                 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
315                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
316 #if !XFS_BIG_INUMS
317                         xfs_warn(mp, "%s option not allowed on this system",
318                                 this_char);
319                         return EINVAL;
320 #endif
321                 } else if (!strcmp(this_char, MNTOPT_NOUUID)) {
322                         mp->m_flags |= XFS_MOUNT_NOUUID;
323                 } else if (!strcmp(this_char, MNTOPT_BARRIER)) {
324                         mp->m_flags |= XFS_MOUNT_BARRIER;
325                 } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
326                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
327                 } else if (!strcmp(this_char, MNTOPT_IKEEP)) {
328                         mp->m_flags |= XFS_MOUNT_IKEEP;
329                 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
330                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
331                 } else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
332                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
333                 } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
334                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
335                 } else if (!strcmp(this_char, MNTOPT_ATTR2)) {
336                         mp->m_flags |= XFS_MOUNT_ATTR2;
337                 } else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
338                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
339                         mp->m_flags |= XFS_MOUNT_NOATTR2;
340                 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
341                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
342                 } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
343                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
344                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
345                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
346                 } else if (!strcmp(this_char, MNTOPT_QUOTA) ||
347                            !strcmp(this_char, MNTOPT_UQUOTA) ||
348                            !strcmp(this_char, MNTOPT_USRQUOTA)) {
349                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
350                                          XFS_UQUOTA_ENFD);
351                 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
352                            !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
353                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
354                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
355                 } else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
356                            !strcmp(this_char, MNTOPT_PRJQUOTA)) {
357                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
358                                          XFS_PQUOTA_ENFD);
359                 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
360                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
361                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
362                 } else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
363                            !strcmp(this_char, MNTOPT_GRPQUOTA)) {
364                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
365                                          XFS_GQUOTA_ENFD);
366                 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
367                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
368                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
369                 } else if (!strcmp(this_char, MNTOPT_DELAYLOG)) {
370                         xfs_warn(mp,
371         "delaylog is the default now, option is deprecated.");
372                 } else if (!strcmp(this_char, MNTOPT_NODELAYLOG)) {
373                         xfs_warn(mp,
374         "nodelaylog support has been removed, option is deprecated.");
375                 } else if (!strcmp(this_char, MNTOPT_DISCARD)) {
376                         mp->m_flags |= XFS_MOUNT_DISCARD;
377                 } else if (!strcmp(this_char, MNTOPT_NODISCARD)) {
378                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
379                 } else if (!strcmp(this_char, "ihashsize")) {
380                         xfs_warn(mp,
381         "ihashsize no longer used, option is deprecated.");
382                 } else if (!strcmp(this_char, "osyncisdsync")) {
383                         xfs_warn(mp,
384         "osyncisdsync has no effect, option is deprecated.");
385                 } else if (!strcmp(this_char, "osyncisosync")) {
386                         xfs_warn(mp,
387         "osyncisosync has no effect, option is deprecated.");
388                 } else if (!strcmp(this_char, "irixsgid")) {
389                         xfs_warn(mp,
390         "irixsgid is now a sysctl(2) variable, option is deprecated.");
391                 } else {
392                         xfs_warn(mp, "unknown mount option [%s].", this_char);
393                         return EINVAL;
394                 }
395         }
396 
397         /*
398          * no recovery flag requires a read-only mount
399          */
400         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
401             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
402                 xfs_warn(mp, "no-recovery mounts must be read-only.");
403                 return EINVAL;
404         }
405 
406         if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
407                 xfs_warn(mp,
408         "sunit and swidth options incompatible with the noalign option");
409                 return EINVAL;
410         }
411 
412 #ifndef CONFIG_XFS_QUOTA
413         if (XFS_IS_QUOTA_RUNNING(mp)) {
414                 xfs_warn(mp, "quota support not available in this kernel.");
415                 return EINVAL;
416         }
417 #endif
418 
419         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
420                 xfs_warn(mp, "sunit and swidth must be specified together");
421                 return EINVAL;
422         }
423 
424         if (dsunit && (dswidth % dsunit != 0)) {
425                 xfs_warn(mp,
426         "stripe width (%d) must be a multiple of the stripe unit (%d)",
427                         dswidth, dsunit);
428                 return EINVAL;
429         }
430 
431 done:
432         if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
433                 /*
434                  * At this point the superblock has not been read
435                  * in, therefore we do not know the block size.
436                  * Before the mount call ends we will convert
437                  * these to FSBs.
438                  */
439                 mp->m_dalign = dsunit;
440                 mp->m_swidth = dswidth;
441         }
442 
443         if (mp->m_logbufs != -1 &&
444             mp->m_logbufs != 0 &&
445             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
446              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
447                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
448                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
449                 return XFS_ERROR(EINVAL);
450         }
451         if (mp->m_logbsize != -1 &&
452             mp->m_logbsize !=  0 &&
453             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
454              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
455              !is_power_of_2(mp->m_logbsize))) {
456                 xfs_warn(mp,
457                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
458                         mp->m_logbsize);
459                 return XFS_ERROR(EINVAL);
460         }
461 
462         if (iosizelog) {
463                 if (iosizelog > XFS_MAX_IO_LOG ||
464                     iosizelog < XFS_MIN_IO_LOG) {
465                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
466                                 iosizelog, XFS_MIN_IO_LOG,
467                                 XFS_MAX_IO_LOG);
468                         return XFS_ERROR(EINVAL);
469                 }
470 
471                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
472                 mp->m_readio_log = iosizelog;
473                 mp->m_writeio_log = iosizelog;
474         }
475 
476         return 0;
477 }
478 
479 struct proc_xfs_info {
480         int     flag;
481         char    *str;
482 };
483 
484 STATIC int
485 xfs_showargs(
486         struct xfs_mount        *mp,
487         struct seq_file         *m)
488 {
489         static struct proc_xfs_info xfs_info_set[] = {
490                 /* the few simple ones we can get from the mount struct */
491                 { XFS_MOUNT_IKEEP,              "," MNTOPT_IKEEP },
492                 { XFS_MOUNT_WSYNC,              "," MNTOPT_WSYNC },
493                 { XFS_MOUNT_NOALIGN,            "," MNTOPT_NOALIGN },
494                 { XFS_MOUNT_SWALLOC,            "," MNTOPT_SWALLOC },
495                 { XFS_MOUNT_NOUUID,             "," MNTOPT_NOUUID },
496                 { XFS_MOUNT_NORECOVERY,         "," MNTOPT_NORECOVERY },
497                 { XFS_MOUNT_ATTR2,              "," MNTOPT_ATTR2 },
498                 { XFS_MOUNT_FILESTREAMS,        "," MNTOPT_FILESTREAM },
499                 { XFS_MOUNT_GRPID,              "," MNTOPT_GRPID },
500                 { XFS_MOUNT_DISCARD,            "," MNTOPT_DISCARD },
501                 { XFS_MOUNT_SMALL_INUMS,        "," MNTOPT_32BITINODE },
502                 { 0, NULL }
503         };
504         static struct proc_xfs_info xfs_info_unset[] = {
505                 /* the few simple ones we can get from the mount struct */
506                 { XFS_MOUNT_COMPAT_IOSIZE,      "," MNTOPT_LARGEIO },
507                 { XFS_MOUNT_BARRIER,            "," MNTOPT_NOBARRIER },
508                 { XFS_MOUNT_SMALL_INUMS,        "," MNTOPT_64BITINODE },
509                 { 0, NULL }
510         };
511         struct proc_xfs_info    *xfs_infop;
512 
513         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
514                 if (mp->m_flags & xfs_infop->flag)
515                         seq_puts(m, xfs_infop->str);
516         }
517         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
518                 if (!(mp->m_flags & xfs_infop->flag))
519                         seq_puts(m, xfs_infop->str);
520         }
521 
522         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
523                 seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk",
524                                 (int)(1 << mp->m_writeio_log) >> 10);
525 
526         if (mp->m_logbufs > 0)
527                 seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
528         if (mp->m_logbsize > 0)
529                 seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10);
530 
531         if (mp->m_logname)
532                 seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname);
533         if (mp->m_rtname)
534                 seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname);
535 
536         if (mp->m_dalign > 0)
537                 seq_printf(m, "," MNTOPT_SUNIT "=%d",
538                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
539         if (mp->m_swidth > 0)
540                 seq_printf(m, "," MNTOPT_SWIDTH "=%d",
541                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
542 
543         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
544                 seq_puts(m, "," MNTOPT_USRQUOTA);
545         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
546                 seq_puts(m, "," MNTOPT_UQUOTANOENF);
547 
548         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
549                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
550                         seq_puts(m, "," MNTOPT_PRJQUOTA);
551                 else
552                         seq_puts(m, "," MNTOPT_PQUOTANOENF);
553         }
554         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
555                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
556                         seq_puts(m, "," MNTOPT_GRPQUOTA);
557                 else
558                         seq_puts(m, "," MNTOPT_GQUOTANOENF);
559         }
560 
561         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
562                 seq_puts(m, "," MNTOPT_NOQUOTA);
563 
564         return 0;
565 }
566 __uint64_t
567 xfs_max_file_offset(
568         unsigned int            blockshift)
569 {
570         unsigned int            pagefactor = 1;
571         unsigned int            bitshift = BITS_PER_LONG - 1;
572 
573         /* Figure out maximum filesize, on Linux this can depend on
574          * the filesystem blocksize (on 32 bit platforms).
575          * __block_write_begin does this in an [unsigned] long...
576          *      page->index << (PAGE_CACHE_SHIFT - bbits)
577          * So, for page sized blocks (4K on 32 bit platforms),
578          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
579          *      (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
580          * but for smaller blocksizes it is less (bbits = log2 bsize).
581          * Note1: get_block_t takes a long (implicit cast from above)
582          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
583          * can optionally convert the [unsigned] long from above into
584          * an [unsigned] long long.
585          */
586 
587 #if BITS_PER_LONG == 32
588 # if defined(CONFIG_LBDAF)
589         ASSERT(sizeof(sector_t) == 8);
590         pagefactor = PAGE_CACHE_SIZE;
591         bitshift = BITS_PER_LONG;
592 # else
593         pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
594 # endif
595 #endif
596 
597         return (((__uint64_t)pagefactor) << bitshift) - 1;
598 }
599 
600 xfs_agnumber_t
601 xfs_set_inode32(struct xfs_mount *mp)
602 {
603         xfs_agnumber_t  index = 0;
604         xfs_agnumber_t  maxagi = 0;
605         xfs_sb_t        *sbp = &mp->m_sb;
606         xfs_agnumber_t  max_metadata;
607         xfs_agino_t     agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks -1, 0);
608         xfs_ino_t       ino = XFS_AGINO_TO_INO(mp, sbp->sb_agcount -1, agino);
609         xfs_perag_t     *pag;
610 
611         /* Calculate how much should be reserved for inodes to meet
612          * the max inode percentage.
613          */
614         if (mp->m_maxicount) {
615                 __uint64_t      icount;
616 
617                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
618                 do_div(icount, 100);
619                 icount += sbp->sb_agblocks - 1;
620                 do_div(icount, sbp->sb_agblocks);
621                 max_metadata = icount;
622         } else {
623                 max_metadata = sbp->sb_agcount;
624         }
625 
626         for (index = 0; index < sbp->sb_agcount; index++) {
627                 ino = XFS_AGINO_TO_INO(mp, index, agino);
628 
629                 if (ino > XFS_MAXINUMBER_32) {
630                         pag = xfs_perag_get(mp, index);
631                         pag->pagi_inodeok = 0;
632                         pag->pagf_metadata = 0;
633                         xfs_perag_put(pag);
634                         continue;
635                 }
636 
637                 pag = xfs_perag_get(mp, index);
638                 pag->pagi_inodeok = 1;
639                 maxagi++;
640                 if (index < max_metadata)
641                         pag->pagf_metadata = 1;
642                 xfs_perag_put(pag);
643         }
644         mp->m_flags |= (XFS_MOUNT_32BITINODES |
645                         XFS_MOUNT_SMALL_INUMS);
646 
647         return maxagi;
648 }
649 
650 xfs_agnumber_t
651 xfs_set_inode64(struct xfs_mount *mp)
652 {
653         xfs_agnumber_t index = 0;
654 
655         for (index = 0; index < mp->m_sb.sb_agcount; index++) {
656                 struct xfs_perag        *pag;
657 
658                 pag = xfs_perag_get(mp, index);
659                 pag->pagi_inodeok = 1;
660                 pag->pagf_metadata = 0;
661                 xfs_perag_put(pag);
662         }
663 
664         /* There is no need for lock protection on m_flags,
665          * the rw_semaphore of the VFS superblock is locked
666          * during mount/umount/remount operations, so this is
667          * enough to avoid concurency on the m_flags field
668          */
669         mp->m_flags &= ~(XFS_MOUNT_32BITINODES |
670                          XFS_MOUNT_SMALL_INUMS);
671         return index;
672 }
673 
674 STATIC int
675 xfs_blkdev_get(
676         xfs_mount_t             *mp,
677         const char              *name,
678         struct block_device     **bdevp)
679 {
680         int                     error = 0;
681 
682         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
683                                     mp);
684         if (IS_ERR(*bdevp)) {
685                 error = PTR_ERR(*bdevp);
686                 xfs_warn(mp, "Invalid device [%s], error=%d\n", name, error);
687         }
688 
689         return -error;
690 }
691 
692 STATIC void
693 xfs_blkdev_put(
694         struct block_device     *bdev)
695 {
696         if (bdev)
697                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
698 }
699 
700 void
701 xfs_blkdev_issue_flush(
702         xfs_buftarg_t           *buftarg)
703 {
704         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
705 }
706 
707 STATIC void
708 xfs_close_devices(
709         struct xfs_mount        *mp)
710 {
711         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
712                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
713                 xfs_free_buftarg(mp, mp->m_logdev_targp);
714                 xfs_blkdev_put(logdev);
715         }
716         if (mp->m_rtdev_targp) {
717                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
718                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
719                 xfs_blkdev_put(rtdev);
720         }
721         xfs_free_buftarg(mp, mp->m_ddev_targp);
722 }
723 
724 /*
725  * The file system configurations are:
726  *      (1) device (partition) with data and internal log
727  *      (2) logical volume with data and log subvolumes.
728  *      (3) logical volume with data, log, and realtime subvolumes.
729  *
730  * We only have to handle opening the log and realtime volumes here if
731  * they are present.  The data subvolume has already been opened by
732  * get_sb_bdev() and is stored in sb->s_bdev.
733  */
734 STATIC int
735 xfs_open_devices(
736         struct xfs_mount        *mp)
737 {
738         struct block_device     *ddev = mp->m_super->s_bdev;
739         struct block_device     *logdev = NULL, *rtdev = NULL;
740         int                     error;
741 
742         /*
743          * Open real time and log devices - order is important.
744          */
745         if (mp->m_logname) {
746                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
747                 if (error)
748                         goto out;
749         }
750 
751         if (mp->m_rtname) {
752                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
753                 if (error)
754                         goto out_close_logdev;
755 
756                 if (rtdev == ddev || rtdev == logdev) {
757                         xfs_warn(mp,
758         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
759                         error = EINVAL;
760                         goto out_close_rtdev;
761                 }
762         }
763 
764         /*
765          * Setup xfs_mount buffer target pointers
766          */
767         error = ENOMEM;
768         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, 0, mp->m_fsname);
769         if (!mp->m_ddev_targp)
770                 goto out_close_rtdev;
771 
772         if (rtdev) {
773                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, 1,
774                                                         mp->m_fsname);
775                 if (!mp->m_rtdev_targp)
776                         goto out_free_ddev_targ;
777         }
778 
779         if (logdev && logdev != ddev) {
780                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, 1,
781                                                         mp->m_fsname);
782                 if (!mp->m_logdev_targp)
783                         goto out_free_rtdev_targ;
784         } else {
785                 mp->m_logdev_targp = mp->m_ddev_targp;
786         }
787 
788         return 0;
789 
790  out_free_rtdev_targ:
791         if (mp->m_rtdev_targp)
792                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
793  out_free_ddev_targ:
794         xfs_free_buftarg(mp, mp->m_ddev_targp);
795  out_close_rtdev:
796         if (rtdev)
797                 xfs_blkdev_put(rtdev);
798  out_close_logdev:
799         if (logdev && logdev != ddev)
800                 xfs_blkdev_put(logdev);
801  out:
802         return error;
803 }
804 
805 /*
806  * Setup xfs_mount buffer target pointers based on superblock
807  */
808 STATIC int
809 xfs_setup_devices(
810         struct xfs_mount        *mp)
811 {
812         int                     error;
813 
814         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_blocksize,
815                                     mp->m_sb.sb_sectsize);
816         if (error)
817                 return error;
818 
819         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
820                 unsigned int    log_sector_size = BBSIZE;
821 
822                 if (xfs_sb_version_hassector(&mp->m_sb))
823                         log_sector_size = mp->m_sb.sb_logsectsize;
824                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
825                                             mp->m_sb.sb_blocksize,
826                                             log_sector_size);
827                 if (error)
828                         return error;
829         }
830         if (mp->m_rtdev_targp) {
831                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
832                                             mp->m_sb.sb_blocksize,
833                                             mp->m_sb.sb_sectsize);
834                 if (error)
835                         return error;
836         }
837 
838         return 0;
839 }
840 
841 STATIC int
842 xfs_init_mount_workqueues(
843         struct xfs_mount        *mp)
844 {
845         mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
846                         WQ_MEM_RECLAIM, 0, mp->m_fsname);
847         if (!mp->m_data_workqueue)
848                 goto out;
849 
850         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
851                         WQ_MEM_RECLAIM, 0, mp->m_fsname);
852         if (!mp->m_unwritten_workqueue)
853                 goto out_destroy_data_iodone_queue;
854 
855         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
856                         WQ_MEM_RECLAIM, 0, mp->m_fsname);
857         if (!mp->m_cil_workqueue)
858                 goto out_destroy_unwritten;
859 
860         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
861                         0, 0, mp->m_fsname);
862         if (!mp->m_reclaim_workqueue)
863                 goto out_destroy_cil;
864 
865         mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
866                         0, 0, mp->m_fsname);
867         if (!mp->m_log_workqueue)
868                 goto out_destroy_reclaim;
869 
870         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
871                         0, 0, mp->m_fsname);
872         if (!mp->m_eofblocks_workqueue)
873                 goto out_destroy_log;
874 
875         return 0;
876 
877 out_destroy_log:
878         destroy_workqueue(mp->m_log_workqueue);
879 out_destroy_reclaim:
880         destroy_workqueue(mp->m_reclaim_workqueue);
881 out_destroy_cil:
882         destroy_workqueue(mp->m_cil_workqueue);
883 out_destroy_unwritten:
884         destroy_workqueue(mp->m_unwritten_workqueue);
885 out_destroy_data_iodone_queue:
886         destroy_workqueue(mp->m_data_workqueue);
887 out:
888         return -ENOMEM;
889 }
890 
891 STATIC void
892 xfs_destroy_mount_workqueues(
893         struct xfs_mount        *mp)
894 {
895         destroy_workqueue(mp->m_eofblocks_workqueue);
896         destroy_workqueue(mp->m_log_workqueue);
897         destroy_workqueue(mp->m_reclaim_workqueue);
898         destroy_workqueue(mp->m_cil_workqueue);
899         destroy_workqueue(mp->m_data_workqueue);
900         destroy_workqueue(mp->m_unwritten_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 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         XFS_STATS_INC(vn_reclaim);
943 
944         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
945 
946         /*
947          * We should never get here with one of the reclaim flags already set.
948          */
949         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
950         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
951 
952         /*
953          * We always use background reclaim here because even if the
954          * inode is clean, it still may be under IO and hence we have
955          * to take the flush lock. The background reclaim path handles
956          * this more efficiently than we can here, so simply let background
957          * reclaim tear down all inodes.
958          */
959         xfs_inode_set_reclaim_tag(ip);
960 }
961 
962 /*
963  * Slab object creation initialisation for the XFS inode.
964  * This covers only the idempotent fields in the XFS inode;
965  * all other fields need to be initialised on allocation
966  * from the slab. This avoids the need to repeatedly initialise
967  * fields in the xfs inode that left in the initialise state
968  * when freeing the inode.
969  */
970 STATIC void
971 xfs_fs_inode_init_once(
972         void                    *inode)
973 {
974         struct xfs_inode        *ip = inode;
975 
976         memset(ip, 0, sizeof(struct xfs_inode));
977 
978         /* vfs inode */
979         inode_init_once(VFS_I(ip));
980 
981         /* xfs inode */
982         atomic_set(&ip->i_pincount, 0);
983         spin_lock_init(&ip->i_flags_lock);
984 
985         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
986                      "xfsino", ip->i_ino);
987 }
988 
989 STATIC void
990 xfs_fs_evict_inode(
991         struct inode            *inode)
992 {
993         xfs_inode_t             *ip = XFS_I(inode);
994 
995         ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
996 
997         trace_xfs_evict_inode(ip);
998 
999         truncate_inode_pages_final(&inode->i_data);
1000         clear_inode(inode);
1001         XFS_STATS_INC(vn_rele);
1002         XFS_STATS_INC(vn_remove);
1003         XFS_STATS_DEC(vn_active);
1004 
1005         xfs_inactive(ip);
1006 }
1007 
1008 /*
1009  * We do an unlocked check for XFS_IDONTCACHE here because we are already
1010  * serialised against cache hits here via the inode->i_lock and igrab() in
1011  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
1012  * racing with us, and it avoids needing to grab a spinlock here for every inode
1013  * we drop the final reference on.
1014  */
1015 STATIC int
1016 xfs_fs_drop_inode(
1017         struct inode            *inode)
1018 {
1019         struct xfs_inode        *ip = XFS_I(inode);
1020 
1021         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1022 }
1023 
1024 STATIC void
1025 xfs_free_fsname(
1026         struct xfs_mount        *mp)
1027 {
1028         kfree(mp->m_fsname);
1029         kfree(mp->m_rtname);
1030         kfree(mp->m_logname);
1031 }
1032 
1033 STATIC void
1034 xfs_fs_put_super(
1035         struct super_block      *sb)
1036 {
1037         struct xfs_mount        *mp = XFS_M(sb);
1038 
1039         xfs_filestream_unmount(mp);
1040         xfs_unmountfs(mp);
1041 
1042         xfs_freesb(mp);
1043         xfs_icsb_destroy_counters(mp);
1044         xfs_destroy_mount_workqueues(mp);
1045         xfs_close_devices(mp);
1046         xfs_free_fsname(mp);
1047         kfree(mp);
1048 }
1049 
1050 STATIC int
1051 xfs_fs_sync_fs(
1052         struct super_block      *sb,
1053         int                     wait)
1054 {
1055         struct xfs_mount        *mp = XFS_M(sb);
1056 
1057         /*
1058          * Doing anything during the async pass would be counterproductive.
1059          */
1060         if (!wait)
1061                 return 0;
1062 
1063         xfs_log_force(mp, XFS_LOG_SYNC);
1064         if (laptop_mode) {
1065                 /*
1066                  * The disk must be active because we're syncing.
1067                  * We schedule log work now (now that the disk is
1068                  * active) instead of later (when it might not be).
1069                  */
1070                 flush_delayed_work(&mp->m_log->l_work);
1071         }
1072 
1073         return 0;
1074 }
1075 
1076 STATIC int
1077 xfs_fs_statfs(
1078         struct dentry           *dentry,
1079         struct kstatfs          *statp)
1080 {
1081         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1082         xfs_sb_t                *sbp = &mp->m_sb;
1083         struct xfs_inode        *ip = XFS_I(dentry->d_inode);
1084         __uint64_t              fakeinos, id;
1085         xfs_extlen_t            lsize;
1086         __int64_t               ffree;
1087 
1088         statp->f_type = XFS_SB_MAGIC;
1089         statp->f_namelen = MAXNAMELEN - 1;
1090 
1091         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1092         statp->f_fsid.val[0] = (u32)id;
1093         statp->f_fsid.val[1] = (u32)(id >> 32);
1094 
1095         xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
1096 
1097         spin_lock(&mp->m_sb_lock);
1098         statp->f_bsize = sbp->sb_blocksize;
1099         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1100         statp->f_blocks = sbp->sb_dblocks - lsize;
1101         statp->f_bfree = statp->f_bavail =
1102                                 sbp->sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1103         fakeinos = statp->f_bfree << sbp->sb_inopblog;
1104         statp->f_files =
1105             MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1106         if (mp->m_maxicount)
1107                 statp->f_files = min_t(typeof(statp->f_files),
1108                                         statp->f_files,
1109                                         mp->m_maxicount);
1110 
1111         /* make sure statp->f_ffree does not underflow */
1112         ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
1113         statp->f_ffree = max_t(__int64_t, ffree, 0);
1114 
1115         spin_unlock(&mp->m_sb_lock);
1116 
1117         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1118             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1119                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1120                 xfs_qm_statvfs(ip, statp);
1121         return 0;
1122 }
1123 
1124 STATIC void
1125 xfs_save_resvblks(struct xfs_mount *mp)
1126 {
1127         __uint64_t resblks = 0;
1128 
1129         mp->m_resblks_save = mp->m_resblks;
1130         xfs_reserve_blocks(mp, &resblks, NULL);
1131 }
1132 
1133 STATIC void
1134 xfs_restore_resvblks(struct xfs_mount *mp)
1135 {
1136         __uint64_t resblks;
1137 
1138         if (mp->m_resblks_save) {
1139                 resblks = mp->m_resblks_save;
1140                 mp->m_resblks_save = 0;
1141         } else
1142                 resblks = xfs_default_resblks(mp);
1143 
1144         xfs_reserve_blocks(mp, &resblks, NULL);
1145 }
1146 
1147 /*
1148  * Trigger writeback of all the dirty metadata in the file system.
1149  *
1150  * This ensures that the metadata is written to their location on disk rather
1151  * than just existing in transactions in the log. This means after a quiesce
1152  * there is no log replay required to write the inodes to disk - this is the
1153  * primary difference between a sync and a quiesce.
1154  *
1155  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1156  * it is started again when appropriate.
1157  */
1158 static void
1159 xfs_quiesce_attr(
1160         struct xfs_mount        *mp)
1161 {
1162         int     error = 0;
1163 
1164         /* wait for all modifications to complete */
1165         while (atomic_read(&mp->m_active_trans) > 0)
1166                 delay(100);
1167 
1168         /* force the log to unpin objects from the now complete transactions */
1169         xfs_log_force(mp, XFS_LOG_SYNC);
1170 
1171         /* reclaim inodes to do any IO before the freeze completes */
1172         xfs_reclaim_inodes(mp, 0);
1173         xfs_reclaim_inodes(mp, SYNC_WAIT);
1174 
1175         /* Push the superblock and write an unmount record */
1176         error = xfs_log_sbcount(mp);
1177         if (error)
1178                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1179                                 "Frozen image may not be consistent.");
1180         /*
1181          * Just warn here till VFS can correctly support
1182          * read-only remount without racing.
1183          */
1184         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1185 
1186         xfs_log_quiesce(mp);
1187 }
1188 
1189 STATIC int
1190 xfs_fs_remount(
1191         struct super_block      *sb,
1192         int                     *flags,
1193         char                    *options)
1194 {
1195         struct xfs_mount        *mp = XFS_M(sb);
1196         substring_t             args[MAX_OPT_ARGS];
1197         char                    *p;
1198         int                     error;
1199 
1200         sync_filesystem(sb);
1201         while ((p = strsep(&options, ",")) != NULL) {
1202                 int token;
1203 
1204                 if (!*p)
1205                         continue;
1206 
1207                 token = match_token(p, tokens, args);
1208                 switch (token) {
1209                 case Opt_barrier:
1210                         mp->m_flags |= XFS_MOUNT_BARRIER;
1211                         break;
1212                 case Opt_nobarrier:
1213                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
1214                         break;
1215                 case Opt_inode64:
1216                         mp->m_maxagi = xfs_set_inode64(mp);
1217                         break;
1218                 case Opt_inode32:
1219                         mp->m_maxagi = xfs_set_inode32(mp);
1220                         break;
1221                 default:
1222                         /*
1223                          * Logically we would return an error here to prevent
1224                          * users from believing they might have changed
1225                          * mount options using remount which can't be changed.
1226                          *
1227                          * But unfortunately mount(8) adds all options from
1228                          * mtab and fstab to the mount arguments in some cases
1229                          * so we can't blindly reject options, but have to
1230                          * check for each specified option if it actually
1231                          * differs from the currently set option and only
1232                          * reject it if that's the case.
1233                          *
1234                          * Until that is implemented we return success for
1235                          * every remount request, and silently ignore all
1236                          * options that we can't actually change.
1237                          */
1238 #if 0
1239                         xfs_info(mp,
1240                 "mount option \"%s\" not supported for remount", p);
1241                         return -EINVAL;
1242 #else
1243                         break;
1244 #endif
1245                 }
1246         }
1247 
1248         /* ro -> rw */
1249         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1250                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1251 
1252                 /*
1253                  * If this is the first remount to writeable state we
1254                  * might have some superblock changes to update.
1255                  */
1256                 if (mp->m_update_flags) {
1257                         error = xfs_mount_log_sb(mp, mp->m_update_flags);
1258                         if (error) {
1259                                 xfs_warn(mp, "failed to write sb changes");
1260                                 return error;
1261                         }
1262                         mp->m_update_flags = 0;
1263                 }
1264 
1265                 /*
1266                  * Fill out the reserve pool if it is empty. Use the stashed
1267                  * value if it is non-zero, otherwise go with the default.
1268                  */
1269                 xfs_restore_resvblks(mp);
1270                 xfs_log_work_queue(mp);
1271         }
1272 
1273         /* rw -> ro */
1274         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1275                 /*
1276                  * Before we sync the metadata, we need to free up the reserve
1277                  * block pool so that the used block count in the superblock on
1278                  * disk is correct at the end of the remount. Stash the current
1279                  * reserve pool size so that if we get remounted rw, we can
1280                  * return it to the same size.
1281                  */
1282                 xfs_save_resvblks(mp);
1283                 xfs_quiesce_attr(mp);
1284                 mp->m_flags |= XFS_MOUNT_RDONLY;
1285         }
1286 
1287         return 0;
1288 }
1289 
1290 /*
1291  * Second stage of a freeze. The data is already frozen so we only
1292  * need to take care of the metadata. Once that's done write a dummy
1293  * record to dirty the log in case of a crash while frozen.
1294  */
1295 STATIC int
1296 xfs_fs_freeze(
1297         struct super_block      *sb)
1298 {
1299         struct xfs_mount        *mp = XFS_M(sb);
1300 
1301         xfs_save_resvblks(mp);
1302         xfs_quiesce_attr(mp);
1303         return -xfs_fs_log_dummy(mp);
1304 }
1305 
1306 STATIC int
1307 xfs_fs_unfreeze(
1308         struct super_block      *sb)
1309 {
1310         struct xfs_mount        *mp = XFS_M(sb);
1311 
1312         xfs_restore_resvblks(mp);
1313         xfs_log_work_queue(mp);
1314         return 0;
1315 }
1316 
1317 STATIC int
1318 xfs_fs_show_options(
1319         struct seq_file         *m,
1320         struct dentry           *root)
1321 {
1322         return -xfs_showargs(XFS_M(root->d_sb), m);
1323 }
1324 
1325 /*
1326  * This function fills in xfs_mount_t fields based on mount args.
1327  * Note: the superblock _has_ now been read in.
1328  */
1329 STATIC int
1330 xfs_finish_flags(
1331         struct xfs_mount        *mp)
1332 {
1333         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1334 
1335         /* Fail a mount where the logbuf is smaller than the log stripe */
1336         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1337                 if (mp->m_logbsize <= 0 &&
1338                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1339                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1340                 } else if (mp->m_logbsize > 0 &&
1341                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1342                         xfs_warn(mp,
1343                 "logbuf size must be greater than or equal to log stripe size");
1344                         return XFS_ERROR(EINVAL);
1345                 }
1346         } else {
1347                 /* Fail a mount if the logbuf is larger than 32K */
1348                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1349                         xfs_warn(mp,
1350                 "logbuf size for version 1 logs must be 16K or 32K");
1351                         return XFS_ERROR(EINVAL);
1352                 }
1353         }
1354 
1355         /*
1356          * V5 filesystems always use attr2 format for attributes.
1357          */
1358         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1359             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1360                 xfs_warn(mp,
1361 "Cannot mount a V5 filesystem as %s. %s is always enabled for V5 filesystems.",
1362                         MNTOPT_NOATTR2, MNTOPT_ATTR2);
1363                 return XFS_ERROR(EINVAL);
1364         }
1365 
1366         /*
1367          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1368          * told by noattr2 to turn it off
1369          */
1370         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1371             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1372                 mp->m_flags |= XFS_MOUNT_ATTR2;
1373 
1374         /*
1375          * prohibit r/w mounts of read-only filesystems
1376          */
1377         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1378                 xfs_warn(mp,
1379                         "cannot mount a read-only filesystem as read-write");
1380                 return XFS_ERROR(EROFS);
1381         }
1382 
1383         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1384             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1385             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1386                 xfs_warn(mp,
1387                   "Super block does not support project and group quota together");
1388                 return XFS_ERROR(EINVAL);
1389         }
1390 
1391         return 0;
1392 }
1393 
1394 STATIC int
1395 xfs_fs_fill_super(
1396         struct super_block      *sb,
1397         void                    *data,
1398         int                     silent)
1399 {
1400         struct inode            *root;
1401         struct xfs_mount        *mp = NULL;
1402         int                     flags = 0, error = ENOMEM;
1403 
1404         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1405         if (!mp)
1406                 goto out;
1407 
1408         spin_lock_init(&mp->m_sb_lock);
1409         mutex_init(&mp->m_growlock);
1410         atomic_set(&mp->m_active_trans, 0);
1411         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1412         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1413 
1414         mp->m_super = sb;
1415         sb->s_fs_info = mp;
1416 
1417         error = xfs_parseargs(mp, (char *)data);
1418         if (error)
1419                 goto out_free_fsname;
1420 
1421         sb_min_blocksize(sb, BBSIZE);
1422         sb->s_xattr = xfs_xattr_handlers;
1423         sb->s_export_op = &xfs_export_operations;
1424 #ifdef CONFIG_XFS_QUOTA
1425         sb->s_qcop = &xfs_quotactl_operations;
1426 #endif
1427         sb->s_op = &xfs_super_operations;
1428 
1429         if (silent)
1430                 flags |= XFS_MFSI_QUIET;
1431 
1432         error = xfs_open_devices(mp);
1433         if (error)
1434                 goto out_free_fsname;
1435 
1436         error = -xfs_init_mount_workqueues(mp);
1437         if (error)
1438                 goto out_close_devices;
1439 
1440         error = -xfs_icsb_init_counters(mp);
1441         if (error)
1442                 goto out_destroy_workqueues;
1443 
1444         error = xfs_readsb(mp, flags);
1445         if (error)
1446                 goto out_destroy_counters;
1447 
1448         error = xfs_finish_flags(mp);
1449         if (error)
1450                 goto out_free_sb;
1451 
1452         error = xfs_setup_devices(mp);
1453         if (error)
1454                 goto out_free_sb;
1455 
1456         error = xfs_filestream_mount(mp);
1457         if (error)
1458                 goto out_free_sb;
1459 
1460         /*
1461          * we must configure the block size in the superblock before we run the
1462          * full mount process as the mount process can lookup and cache inodes.
1463          */
1464         sb->s_magic = XFS_SB_MAGIC;
1465         sb->s_blocksize = mp->m_sb.sb_blocksize;
1466         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1467         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1468         sb->s_max_links = XFS_MAXLINK;
1469         sb->s_time_gran = 1;
1470         set_posix_acl_flag(sb);
1471 
1472         /* version 5 superblocks support inode version counters. */
1473         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1474                 sb->s_flags |= MS_I_VERSION;
1475 
1476         error = xfs_mountfs(mp);
1477         if (error)
1478                 goto out_filestream_unmount;
1479 
1480         root = igrab(VFS_I(mp->m_rootip));
1481         if (!root) {
1482                 error = ENOENT;
1483                 goto out_unmount;
1484         }
1485         sb->s_root = d_make_root(root);
1486         if (!sb->s_root) {
1487                 error = ENOMEM;
1488                 goto out_unmount;
1489         }
1490 
1491         return 0;
1492 
1493  out_filestream_unmount:
1494         xfs_filestream_unmount(mp);
1495  out_free_sb:
1496         xfs_freesb(mp);
1497  out_destroy_counters:
1498         xfs_icsb_destroy_counters(mp);
1499 out_destroy_workqueues:
1500         xfs_destroy_mount_workqueues(mp);
1501  out_close_devices:
1502         xfs_close_devices(mp);
1503  out_free_fsname:
1504         xfs_free_fsname(mp);
1505         kfree(mp);
1506  out:
1507         return -error;
1508 
1509  out_unmount:
1510         xfs_filestream_unmount(mp);
1511         xfs_unmountfs(mp);
1512         goto out_free_sb;
1513 }
1514 
1515 STATIC struct dentry *
1516 xfs_fs_mount(
1517         struct file_system_type *fs_type,
1518         int                     flags,
1519         const char              *dev_name,
1520         void                    *data)
1521 {
1522         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1523 }
1524 
1525 static long
1526 xfs_fs_nr_cached_objects(
1527         struct super_block      *sb,
1528         int                     nid)
1529 {
1530         return xfs_reclaim_inodes_count(XFS_M(sb));
1531 }
1532 
1533 static long
1534 xfs_fs_free_cached_objects(
1535         struct super_block      *sb,
1536         long                    nr_to_scan,
1537         int                     nid)
1538 {
1539         return xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan);
1540 }
1541 
1542 static const struct super_operations xfs_super_operations = {
1543         .alloc_inode            = xfs_fs_alloc_inode,
1544         .destroy_inode          = xfs_fs_destroy_inode,
1545         .evict_inode            = xfs_fs_evict_inode,
1546         .drop_inode             = xfs_fs_drop_inode,
1547         .put_super              = xfs_fs_put_super,
1548         .sync_fs                = xfs_fs_sync_fs,
1549         .freeze_fs              = xfs_fs_freeze,
1550         .unfreeze_fs            = xfs_fs_unfreeze,
1551         .statfs                 = xfs_fs_statfs,
1552         .remount_fs             = xfs_fs_remount,
1553         .show_options           = xfs_fs_show_options,
1554         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1555         .free_cached_objects    = xfs_fs_free_cached_objects,
1556 };
1557 
1558 static struct file_system_type xfs_fs_type = {
1559         .owner                  = THIS_MODULE,
1560         .name                   = "xfs",
1561         .mount                  = xfs_fs_mount,
1562         .kill_sb                = kill_block_super,
1563         .fs_flags               = FS_REQUIRES_DEV,
1564 };
1565 MODULE_ALIAS_FS("xfs");
1566 
1567 STATIC int __init
1568 xfs_init_zones(void)
1569 {
1570 
1571         xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
1572         if (!xfs_ioend_zone)
1573                 goto out;
1574 
1575         xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
1576                                                   xfs_ioend_zone);
1577         if (!xfs_ioend_pool)
1578                 goto out_destroy_ioend_zone;
1579 
1580         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1581                                                 "xfs_log_ticket");
1582         if (!xfs_log_ticket_zone)
1583                 goto out_destroy_ioend_pool;
1584 
1585         xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
1586                                                 "xfs_bmap_free_item");
1587         if (!xfs_bmap_free_item_zone)
1588                 goto out_destroy_log_ticket_zone;
1589 
1590         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1591                                                 "xfs_btree_cur");
1592         if (!xfs_btree_cur_zone)
1593                 goto out_destroy_bmap_free_item_zone;
1594 
1595         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1596                                                 "xfs_da_state");
1597         if (!xfs_da_state_zone)
1598                 goto out_destroy_btree_cur_zone;
1599 
1600         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1601         if (!xfs_ifork_zone)
1602                 goto out_destroy_da_state_zone;
1603 
1604         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1605         if (!xfs_trans_zone)
1606                 goto out_destroy_ifork_zone;
1607 
1608         xfs_log_item_desc_zone =
1609                 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1610                                "xfs_log_item_desc");
1611         if (!xfs_log_item_desc_zone)
1612                 goto out_destroy_trans_zone;
1613 
1614         /*
1615          * The size of the zone allocated buf log item is the maximum
1616          * size possible under XFS.  This wastes a little bit of memory,
1617          * but it is much faster.
1618          */
1619         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1620                                            "xfs_buf_item");
1621         if (!xfs_buf_item_zone)
1622                 goto out_destroy_log_item_desc_zone;
1623 
1624         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1625                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1626                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1627         if (!xfs_efd_zone)
1628                 goto out_destroy_buf_item_zone;
1629 
1630         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1631                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1632                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1633         if (!xfs_efi_zone)
1634                 goto out_destroy_efd_zone;
1635 
1636         xfs_inode_zone =
1637                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1638                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD,
1639                         xfs_fs_inode_init_once);
1640         if (!xfs_inode_zone)
1641                 goto out_destroy_efi_zone;
1642 
1643         xfs_ili_zone =
1644                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1645                                         KM_ZONE_SPREAD, NULL);
1646         if (!xfs_ili_zone)
1647                 goto out_destroy_inode_zone;
1648         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1649                                         "xfs_icr");
1650         if (!xfs_icreate_zone)
1651                 goto out_destroy_ili_zone;
1652 
1653         return 0;
1654 
1655  out_destroy_ili_zone:
1656         kmem_zone_destroy(xfs_ili_zone);
1657  out_destroy_inode_zone:
1658         kmem_zone_destroy(xfs_inode_zone);
1659  out_destroy_efi_zone:
1660         kmem_zone_destroy(xfs_efi_zone);
1661  out_destroy_efd_zone:
1662         kmem_zone_destroy(xfs_efd_zone);
1663  out_destroy_buf_item_zone:
1664         kmem_zone_destroy(xfs_buf_item_zone);
1665  out_destroy_log_item_desc_zone:
1666         kmem_zone_destroy(xfs_log_item_desc_zone);
1667  out_destroy_trans_zone:
1668         kmem_zone_destroy(xfs_trans_zone);
1669  out_destroy_ifork_zone:
1670         kmem_zone_destroy(xfs_ifork_zone);
1671  out_destroy_da_state_zone:
1672         kmem_zone_destroy(xfs_da_state_zone);
1673  out_destroy_btree_cur_zone:
1674         kmem_zone_destroy(xfs_btree_cur_zone);
1675  out_destroy_bmap_free_item_zone:
1676         kmem_zone_destroy(xfs_bmap_free_item_zone);
1677  out_destroy_log_ticket_zone:
1678         kmem_zone_destroy(xfs_log_ticket_zone);
1679  out_destroy_ioend_pool:
1680         mempool_destroy(xfs_ioend_pool);
1681  out_destroy_ioend_zone:
1682         kmem_zone_destroy(xfs_ioend_zone);
1683  out:
1684         return -ENOMEM;
1685 }
1686 
1687 STATIC void
1688 xfs_destroy_zones(void)
1689 {
1690         /*
1691          * Make sure all delayed rcu free are flushed before we
1692          * destroy caches.
1693          */
1694         rcu_barrier();
1695         kmem_zone_destroy(xfs_icreate_zone);
1696         kmem_zone_destroy(xfs_ili_zone);
1697         kmem_zone_destroy(xfs_inode_zone);
1698         kmem_zone_destroy(xfs_efi_zone);
1699         kmem_zone_destroy(xfs_efd_zone);
1700         kmem_zone_destroy(xfs_buf_item_zone);
1701         kmem_zone_destroy(xfs_log_item_desc_zone);
1702         kmem_zone_destroy(xfs_trans_zone);
1703         kmem_zone_destroy(xfs_ifork_zone);
1704         kmem_zone_destroy(xfs_da_state_zone);
1705         kmem_zone_destroy(xfs_btree_cur_zone);
1706         kmem_zone_destroy(xfs_bmap_free_item_zone);
1707         kmem_zone_destroy(xfs_log_ticket_zone);
1708         mempool_destroy(xfs_ioend_pool);
1709         kmem_zone_destroy(xfs_ioend_zone);
1710 
1711 }
1712 
1713 STATIC int __init
1714 xfs_init_workqueues(void)
1715 {
1716         /*
1717          * The allocation workqueue can be used in memory reclaim situations
1718          * (writepage path), and parallelism is only limited by the number of
1719          * AGs in all the filesystems mounted. Hence use the default large
1720          * max_active value for this workqueue.
1721          */
1722         xfs_alloc_wq = alloc_workqueue("xfsalloc", WQ_MEM_RECLAIM, 0);
1723         if (!xfs_alloc_wq)
1724                 return -ENOMEM;
1725 
1726         return 0;
1727 }
1728 
1729 STATIC void
1730 xfs_destroy_workqueues(void)
1731 {
1732         destroy_workqueue(xfs_alloc_wq);
1733 }
1734 
1735 STATIC int __init
1736 init_xfs_fs(void)
1737 {
1738         int                     error;
1739 
1740         printk(KERN_INFO XFS_VERSION_STRING " with "
1741                          XFS_BUILD_OPTIONS " enabled\n");
1742 
1743         xfs_dir_startup();
1744 
1745         error = xfs_init_zones();
1746         if (error)
1747                 goto out;
1748 
1749         error = xfs_init_workqueues();
1750         if (error)
1751                 goto out_destroy_zones;
1752 
1753         error = xfs_mru_cache_init();
1754         if (error)
1755                 goto out_destroy_wq;
1756 
1757         error = xfs_filestream_init();
1758         if (error)
1759                 goto out_mru_cache_uninit;
1760 
1761         error = xfs_buf_init();
1762         if (error)
1763                 goto out_filestream_uninit;
1764 
1765         error = xfs_init_procfs();
1766         if (error)
1767                 goto out_buf_terminate;
1768 
1769         error = xfs_sysctl_register();
1770         if (error)
1771                 goto out_cleanup_procfs;
1772 
1773         error = xfs_qm_init();
1774         if (error)
1775                 goto out_sysctl_unregister;
1776 
1777         error = register_filesystem(&xfs_fs_type);
1778         if (error)
1779                 goto out_qm_exit;
1780         return 0;
1781 
1782  out_qm_exit:
1783         xfs_qm_exit();
1784  out_sysctl_unregister:
1785         xfs_sysctl_unregister();
1786  out_cleanup_procfs:
1787         xfs_cleanup_procfs();
1788  out_buf_terminate:
1789         xfs_buf_terminate();
1790  out_filestream_uninit:
1791         xfs_filestream_uninit();
1792  out_mru_cache_uninit:
1793         xfs_mru_cache_uninit();
1794  out_destroy_wq:
1795         xfs_destroy_workqueues();
1796  out_destroy_zones:
1797         xfs_destroy_zones();
1798  out:
1799         return error;
1800 }
1801 
1802 STATIC void __exit
1803 exit_xfs_fs(void)
1804 {
1805         xfs_qm_exit();
1806         unregister_filesystem(&xfs_fs_type);
1807         xfs_sysctl_unregister();
1808         xfs_cleanup_procfs();
1809         xfs_buf_terminate();
1810         xfs_filestream_uninit();
1811         xfs_mru_cache_uninit();
1812         xfs_destroy_workqueues();
1813         xfs_destroy_zones();
1814 }
1815 
1816 module_init(init_xfs_fs);
1817 module_exit(exit_xfs_fs);
1818 
1819 MODULE_AUTHOR("Silicon Graphics, Inc.");
1820 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
1821 MODULE_LICENSE("GPL");
1822 

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