Version:  2.0.40 2.2.26 2.4.37 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 3.16 3.17

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 struct kset *xfs_kset;
 65 
 66 #define MNTOPT_LOGBUFS  "logbufs"       /* number of XFS log buffers */
 67 #define MNTOPT_LOGBSIZE "logbsize"      /* size of XFS log buffers */
 68 #define MNTOPT_LOGDEV   "logdev"        /* log device */
 69 #define MNTOPT_RTDEV    "rtdev"         /* realtime I/O device */
 70 #define MNTOPT_BIOSIZE  "biosize"       /* log2 of preferred buffered io size */
 71 #define MNTOPT_WSYNC    "wsync"         /* safe-mode nfs compatible mount */
 72 #define MNTOPT_NOALIGN  "noalign"       /* turn off stripe alignment */
 73 #define MNTOPT_SWALLOC  "swalloc"       /* turn on stripe width allocation */
 74 #define MNTOPT_SUNIT    "sunit"         /* data volume stripe unit */
 75 #define MNTOPT_SWIDTH   "swidth"        /* data volume stripe width */
 76 #define MNTOPT_NOUUID   "nouuid"        /* ignore filesystem UUID */
 77 #define MNTOPT_MTPT     "mtpt"          /* filesystem mount point */
 78 #define MNTOPT_GRPID    "grpid"         /* group-ID from parent directory */
 79 #define MNTOPT_NOGRPID  "nogrpid"       /* group-ID from current process */
 80 #define MNTOPT_BSDGROUPS    "bsdgroups"    /* group-ID from parent directory */
 81 #define MNTOPT_SYSVGROUPS   "sysvgroups"   /* group-ID from current process */
 82 #define MNTOPT_ALLOCSIZE    "allocsize"    /* preferred allocation size */
 83 #define MNTOPT_NORECOVERY   "norecovery"   /* don't run XFS recovery */
 84 #define MNTOPT_BARRIER  "barrier"       /* use writer barriers for log write and
 85                                          * unwritten extent conversion */
 86 #define MNTOPT_NOBARRIER "nobarrier"    /* .. disable */
 87 #define MNTOPT_64BITINODE   "inode64"   /* inodes can be allocated anywhere */
 88 #define MNTOPT_32BITINODE   "inode32"   /* inode allocation limited to
 89                                          * XFS_MAXINUMBER_32 */
 90 #define MNTOPT_IKEEP    "ikeep"         /* do not free empty inode clusters */
 91 #define MNTOPT_NOIKEEP  "noikeep"       /* free empty inode clusters */
 92 #define MNTOPT_LARGEIO     "largeio"    /* report large I/O sizes in stat() */
 93 #define MNTOPT_NOLARGEIO   "nolargeio"  /* do not report large I/O sizes
 94                                          * in stat(). */
 95 #define MNTOPT_ATTR2    "attr2"         /* do use attr2 attribute format */
 96 #define MNTOPT_NOATTR2  "noattr2"       /* do not use attr2 attribute format */
 97 #define MNTOPT_FILESTREAM  "filestreams" /* use filestreams allocator */
 98 #define MNTOPT_QUOTA    "quota"         /* disk quotas (user) */
 99 #define MNTOPT_NOQUOTA  "noquota"       /* no quotas */
100 #define MNTOPT_USRQUOTA "usrquota"      /* user quota enabled */
101 #define MNTOPT_GRPQUOTA "grpquota"      /* group quota enabled */
102 #define MNTOPT_PRJQUOTA "prjquota"      /* project quota enabled */
103 #define MNTOPT_UQUOTA   "uquota"        /* user quota (IRIX variant) */
104 #define MNTOPT_GQUOTA   "gquota"        /* group quota (IRIX variant) */
105 #define MNTOPT_PQUOTA   "pquota"        /* project quota (IRIX variant) */
106 #define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */
107 #define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */
108 #define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */
109 #define MNTOPT_QUOTANOENF  "qnoenforce" /* same as uqnoenforce */
110 #define MNTOPT_DELAYLOG    "delaylog"   /* Delayed logging enabled */
111 #define MNTOPT_NODELAYLOG  "nodelaylog" /* Delayed logging disabled */
112 #define MNTOPT_DISCARD     "discard"    /* Discard unused blocks */
113 #define MNTOPT_NODISCARD   "nodiscard"  /* Do not discard unused blocks */
114 
115 /*
116  * Table driven mount option parser.
117  *
118  * Currently only used for remount, but it will be used for mount
119  * in the future, too.
120  */
121 enum {
122         Opt_barrier,
123         Opt_nobarrier,
124         Opt_inode64,
125         Opt_inode32,
126         Opt_err
127 };
128 
129 static const match_table_t tokens = {
130         {Opt_barrier, "barrier"},
131         {Opt_nobarrier, "nobarrier"},
132         {Opt_inode64, "inode64"},
133         {Opt_inode32, "inode32"},
134         {Opt_err, NULL}
135 };
136 
137 
138 STATIC unsigned long
139 suffix_kstrtoint(char *s, unsigned int base, int *res)
140 {
141         int     last, shift_left_factor = 0, _res;
142         char    *value = s;
143 
144         last = strlen(value) - 1;
145         if (value[last] == 'K' || value[last] == 'k') {
146                 shift_left_factor = 10;
147                 value[last] = '\0';
148         }
149         if (value[last] == 'M' || value[last] == 'm') {
150                 shift_left_factor = 20;
151                 value[last] = '\0';
152         }
153         if (value[last] == 'G' || value[last] == 'g') {
154                 shift_left_factor = 30;
155                 value[last] = '\0';
156         }
157 
158         if (kstrtoint(s, base, &_res))
159                 return -EINVAL;
160         *res = _res << shift_left_factor;
161         return 0;
162 }
163 
164 /*
165  * This function fills in xfs_mount_t fields based on mount args.
166  * Note: the superblock has _not_ yet been read in.
167  *
168  * Note that this function leaks the various device name allocations on
169  * failure.  The caller takes care of them.
170  */
171 STATIC int
172 xfs_parseargs(
173         struct xfs_mount        *mp,
174         char                    *options)
175 {
176         struct super_block      *sb = mp->m_super;
177         char                    *this_char, *value;
178         int                     dsunit = 0;
179         int                     dswidth = 0;
180         int                     iosize = 0;
181         __uint8_t               iosizelog = 0;
182 
183         /*
184          * set up the mount name first so all the errors will refer to the
185          * correct device.
186          */
187         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
188         if (!mp->m_fsname)
189                 return -ENOMEM;
190         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
191 
192         /*
193          * Copy binary VFS mount flags we are interested in.
194          */
195         if (sb->s_flags & MS_RDONLY)
196                 mp->m_flags |= XFS_MOUNT_RDONLY;
197         if (sb->s_flags & MS_DIRSYNC)
198                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
199         if (sb->s_flags & MS_SYNCHRONOUS)
200                 mp->m_flags |= XFS_MOUNT_WSYNC;
201 
202         /*
203          * Set some default flags that could be cleared by the mount option
204          * parsing.
205          */
206         mp->m_flags |= XFS_MOUNT_BARRIER;
207         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
208 
209         /*
210          * These can be overridden by the mount option parsing.
211          */
212         mp->m_logbufs = -1;
213         mp->m_logbsize = -1;
214 
215         if (!options)
216                 goto done;
217 
218         while ((this_char = strsep(&options, ",")) != NULL) {
219                 if (!*this_char)
220                         continue;
221                 if ((value = strchr(this_char, '=')) != NULL)
222                         *value++ = 0;
223 
224                 if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
225                         if (!value || !*value) {
226                                 xfs_warn(mp, "%s option requires an argument",
227                                         this_char);
228                                 return -EINVAL;
229                         }
230                         if (kstrtoint(value, 10, &mp->m_logbufs))
231                                 return -EINVAL;
232                 } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
233                         if (!value || !*value) {
234                                 xfs_warn(mp, "%s option requires an argument",
235                                         this_char);
236                                 return -EINVAL;
237                         }
238                         if (suffix_kstrtoint(value, 10, &mp->m_logbsize))
239                                 return -EINVAL;
240                 } else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
241                         if (!value || !*value) {
242                                 xfs_warn(mp, "%s option requires an argument",
243                                         this_char);
244                                 return -EINVAL;
245                         }
246                         mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
247                         if (!mp->m_logname)
248                                 return -ENOMEM;
249                 } else if (!strcmp(this_char, MNTOPT_MTPT)) {
250                         xfs_warn(mp, "%s option not allowed on this system",
251                                 this_char);
252                         return -EINVAL;
253                 } else if (!strcmp(this_char, MNTOPT_RTDEV)) {
254                         if (!value || !*value) {
255                                 xfs_warn(mp, "%s option requires an argument",
256                                         this_char);
257                                 return -EINVAL;
258                         }
259                         mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
260                         if (!mp->m_rtname)
261                                 return -ENOMEM;
262                 } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
263                         if (!value || !*value) {
264                                 xfs_warn(mp, "%s option requires an argument",
265                                         this_char);
266                                 return -EINVAL;
267                         }
268                         if (kstrtoint(value, 10, &iosize))
269                                 return -EINVAL;
270                         iosizelog = ffs(iosize) - 1;
271                 } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
272                         if (!value || !*value) {
273                                 xfs_warn(mp, "%s option requires an argument",
274                                         this_char);
275                                 return -EINVAL;
276                         }
277                         if (suffix_kstrtoint(value, 10, &iosize))
278                                 return -EINVAL;
279                         iosizelog = ffs(iosize) - 1;
280                 } else if (!strcmp(this_char, MNTOPT_GRPID) ||
281                            !strcmp(this_char, MNTOPT_BSDGROUPS)) {
282                         mp->m_flags |= XFS_MOUNT_GRPID;
283                 } else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
284                            !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
285                         mp->m_flags &= ~XFS_MOUNT_GRPID;
286                 } else if (!strcmp(this_char, MNTOPT_WSYNC)) {
287                         mp->m_flags |= XFS_MOUNT_WSYNC;
288                 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
289                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
290                 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
291                         mp->m_flags |= XFS_MOUNT_NOALIGN;
292                 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
293                         mp->m_flags |= XFS_MOUNT_SWALLOC;
294                 } else if (!strcmp(this_char, MNTOPT_SUNIT)) {
295                         if (!value || !*value) {
296                                 xfs_warn(mp, "%s option requires an argument",
297                                         this_char);
298                                 return -EINVAL;
299                         }
300                         if (kstrtoint(value, 10, &dsunit))
301                                 return -EINVAL;
302                 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
303                         if (!value || !*value) {
304                                 xfs_warn(mp, "%s option requires an argument",
305                                         this_char);
306                                 return -EINVAL;
307                         }
308                         if (kstrtoint(value, 10, &dswidth))
309                                 return -EINVAL;
310                 } else if (!strcmp(this_char, MNTOPT_32BITINODE)) {
311                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
312                 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
313                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
314                 } else if (!strcmp(this_char, MNTOPT_NOUUID)) {
315                         mp->m_flags |= XFS_MOUNT_NOUUID;
316                 } else if (!strcmp(this_char, MNTOPT_BARRIER)) {
317                         mp->m_flags |= XFS_MOUNT_BARRIER;
318                 } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
319                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
320                 } else if (!strcmp(this_char, MNTOPT_IKEEP)) {
321                         mp->m_flags |= XFS_MOUNT_IKEEP;
322                 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
323                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
324                 } else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
325                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
326                 } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
327                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
328                 } else if (!strcmp(this_char, MNTOPT_ATTR2)) {
329                         mp->m_flags |= XFS_MOUNT_ATTR2;
330                 } else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
331                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
332                         mp->m_flags |= XFS_MOUNT_NOATTR2;
333                 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
334                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
335                 } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
336                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
337                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
338                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
339                 } else if (!strcmp(this_char, MNTOPT_QUOTA) ||
340                            !strcmp(this_char, MNTOPT_UQUOTA) ||
341                            !strcmp(this_char, MNTOPT_USRQUOTA)) {
342                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
343                                          XFS_UQUOTA_ENFD);
344                 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
345                            !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
346                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
347                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
348                 } else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
349                            !strcmp(this_char, MNTOPT_PRJQUOTA)) {
350                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
351                                          XFS_PQUOTA_ENFD);
352                 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
353                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
354                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
355                 } else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
356                            !strcmp(this_char, MNTOPT_GRPQUOTA)) {
357                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
358                                          XFS_GQUOTA_ENFD);
359                 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
360                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
361                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
362                 } else if (!strcmp(this_char, MNTOPT_DELAYLOG)) {
363                         xfs_warn(mp,
364         "delaylog is the default now, option is deprecated.");
365                 } else if (!strcmp(this_char, MNTOPT_NODELAYLOG)) {
366                         xfs_warn(mp,
367         "nodelaylog support has been removed, option is deprecated.");
368                 } else if (!strcmp(this_char, MNTOPT_DISCARD)) {
369                         mp->m_flags |= XFS_MOUNT_DISCARD;
370                 } else if (!strcmp(this_char, MNTOPT_NODISCARD)) {
371                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
372                 } else if (!strcmp(this_char, "ihashsize")) {
373                         xfs_warn(mp,
374         "ihashsize no longer used, option is deprecated.");
375                 } else if (!strcmp(this_char, "osyncisdsync")) {
376                         xfs_warn(mp,
377         "osyncisdsync has no effect, option is deprecated.");
378                 } else if (!strcmp(this_char, "osyncisosync")) {
379                         xfs_warn(mp,
380         "osyncisosync has no effect, option is deprecated.");
381                 } else if (!strcmp(this_char, "irixsgid")) {
382                         xfs_warn(mp,
383         "irixsgid is now a sysctl(2) variable, option is deprecated.");
384                 } else {
385                         xfs_warn(mp, "unknown mount option [%s].", this_char);
386                         return -EINVAL;
387                 }
388         }
389 
390         /*
391          * no recovery flag requires a read-only mount
392          */
393         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
394             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
395                 xfs_warn(mp, "no-recovery mounts must be read-only.");
396                 return -EINVAL;
397         }
398 
399         if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
400                 xfs_warn(mp,
401         "sunit and swidth options incompatible with the noalign option");
402                 return -EINVAL;
403         }
404 
405 #ifndef CONFIG_XFS_QUOTA
406         if (XFS_IS_QUOTA_RUNNING(mp)) {
407                 xfs_warn(mp, "quota support not available in this kernel.");
408                 return -EINVAL;
409         }
410 #endif
411 
412         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
413                 xfs_warn(mp, "sunit and swidth must be specified together");
414                 return -EINVAL;
415         }
416 
417         if (dsunit && (dswidth % dsunit != 0)) {
418                 xfs_warn(mp,
419         "stripe width (%d) must be a multiple of the stripe unit (%d)",
420                         dswidth, dsunit);
421                 return -EINVAL;
422         }
423 
424 done:
425         if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
426                 /*
427                  * At this point the superblock has not been read
428                  * in, therefore we do not know the block size.
429                  * Before the mount call ends we will convert
430                  * these to FSBs.
431                  */
432                 mp->m_dalign = dsunit;
433                 mp->m_swidth = dswidth;
434         }
435 
436         if (mp->m_logbufs != -1 &&
437             mp->m_logbufs != 0 &&
438             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
439              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
440                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
441                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
442                 return -EINVAL;
443         }
444         if (mp->m_logbsize != -1 &&
445             mp->m_logbsize !=  0 &&
446             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
447              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
448              !is_power_of_2(mp->m_logbsize))) {
449                 xfs_warn(mp,
450                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
451                         mp->m_logbsize);
452                 return -EINVAL;
453         }
454 
455         if (iosizelog) {
456                 if (iosizelog > XFS_MAX_IO_LOG ||
457                     iosizelog < XFS_MIN_IO_LOG) {
458                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
459                                 iosizelog, XFS_MIN_IO_LOG,
460                                 XFS_MAX_IO_LOG);
461                         return -EINVAL;
462                 }
463 
464                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
465                 mp->m_readio_log = iosizelog;
466                 mp->m_writeio_log = iosizelog;
467         }
468 
469         return 0;
470 }
471 
472 struct proc_xfs_info {
473         int     flag;
474         char    *str;
475 };
476 
477 STATIC int
478 xfs_showargs(
479         struct xfs_mount        *mp,
480         struct seq_file         *m)
481 {
482         static struct proc_xfs_info xfs_info_set[] = {
483                 /* the few simple ones we can get from the mount struct */
484                 { XFS_MOUNT_IKEEP,              "," MNTOPT_IKEEP },
485                 { XFS_MOUNT_WSYNC,              "," MNTOPT_WSYNC },
486                 { XFS_MOUNT_NOALIGN,            "," MNTOPT_NOALIGN },
487                 { XFS_MOUNT_SWALLOC,            "," MNTOPT_SWALLOC },
488                 { XFS_MOUNT_NOUUID,             "," MNTOPT_NOUUID },
489                 { XFS_MOUNT_NORECOVERY,         "," MNTOPT_NORECOVERY },
490                 { XFS_MOUNT_ATTR2,              "," MNTOPT_ATTR2 },
491                 { XFS_MOUNT_FILESTREAMS,        "," MNTOPT_FILESTREAM },
492                 { XFS_MOUNT_GRPID,              "," MNTOPT_GRPID },
493                 { XFS_MOUNT_DISCARD,            "," MNTOPT_DISCARD },
494                 { XFS_MOUNT_SMALL_INUMS,        "," MNTOPT_32BITINODE },
495                 { 0, NULL }
496         };
497         static struct proc_xfs_info xfs_info_unset[] = {
498                 /* the few simple ones we can get from the mount struct */
499                 { XFS_MOUNT_COMPAT_IOSIZE,      "," MNTOPT_LARGEIO },
500                 { XFS_MOUNT_BARRIER,            "," MNTOPT_NOBARRIER },
501                 { XFS_MOUNT_SMALL_INUMS,        "," MNTOPT_64BITINODE },
502                 { 0, NULL }
503         };
504         struct proc_xfs_info    *xfs_infop;
505 
506         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
507                 if (mp->m_flags & xfs_infop->flag)
508                         seq_puts(m, xfs_infop->str);
509         }
510         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
511                 if (!(mp->m_flags & xfs_infop->flag))
512                         seq_puts(m, xfs_infop->str);
513         }
514 
515         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
516                 seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk",
517                                 (int)(1 << mp->m_writeio_log) >> 10);
518 
519         if (mp->m_logbufs > 0)
520                 seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
521         if (mp->m_logbsize > 0)
522                 seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10);
523 
524         if (mp->m_logname)
525                 seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname);
526         if (mp->m_rtname)
527                 seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname);
528 
529         if (mp->m_dalign > 0)
530                 seq_printf(m, "," MNTOPT_SUNIT "=%d",
531                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
532         if (mp->m_swidth > 0)
533                 seq_printf(m, "," MNTOPT_SWIDTH "=%d",
534                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
535 
536         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
537                 seq_puts(m, "," MNTOPT_USRQUOTA);
538         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
539                 seq_puts(m, "," MNTOPT_UQUOTANOENF);
540 
541         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
542                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
543                         seq_puts(m, "," MNTOPT_PRJQUOTA);
544                 else
545                         seq_puts(m, "," MNTOPT_PQUOTANOENF);
546         }
547         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
548                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
549                         seq_puts(m, "," MNTOPT_GRPQUOTA);
550                 else
551                         seq_puts(m, "," MNTOPT_GQUOTANOENF);
552         }
553 
554         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
555                 seq_puts(m, "," MNTOPT_NOQUOTA);
556 
557         return 0;
558 }
559 __uint64_t
560 xfs_max_file_offset(
561         unsigned int            blockshift)
562 {
563         unsigned int            pagefactor = 1;
564         unsigned int            bitshift = BITS_PER_LONG - 1;
565 
566         /* Figure out maximum filesize, on Linux this can depend on
567          * the filesystem blocksize (on 32 bit platforms).
568          * __block_write_begin does this in an [unsigned] long...
569          *      page->index << (PAGE_CACHE_SHIFT - bbits)
570          * So, for page sized blocks (4K on 32 bit platforms),
571          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
572          *      (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
573          * but for smaller blocksizes it is less (bbits = log2 bsize).
574          * Note1: get_block_t takes a long (implicit cast from above)
575          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
576          * can optionally convert the [unsigned] long from above into
577          * an [unsigned] long long.
578          */
579 
580 #if BITS_PER_LONG == 32
581 # if defined(CONFIG_LBDAF)
582         ASSERT(sizeof(sector_t) == 8);
583         pagefactor = PAGE_CACHE_SIZE;
584         bitshift = BITS_PER_LONG;
585 # else
586         pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
587 # endif
588 #endif
589 
590         return (((__uint64_t)pagefactor) << bitshift) - 1;
591 }
592 
593 /*
594  * xfs_set_inode32() and xfs_set_inode64() are passed an agcount
595  * because in the growfs case, mp->m_sb.sb_agcount is not updated
596  * yet to the potentially higher ag count.
597  */
598 xfs_agnumber_t
599 xfs_set_inode32(struct xfs_mount *mp, xfs_agnumber_t agcount)
600 {
601         xfs_agnumber_t  index = 0;
602         xfs_agnumber_t  maxagi = 0;
603         xfs_sb_t        *sbp = &mp->m_sb;
604         xfs_agnumber_t  max_metadata;
605         xfs_agino_t     agino;
606         xfs_ino_t       ino;
607         xfs_perag_t     *pag;
608 
609         /* Calculate how much should be reserved for inodes to meet
610          * the max inode percentage.
611          */
612         if (mp->m_maxicount) {
613                 __uint64_t      icount;
614 
615                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
616                 do_div(icount, 100);
617                 icount += sbp->sb_agblocks - 1;
618                 do_div(icount, sbp->sb_agblocks);
619                 max_metadata = icount;
620         } else {
621                 max_metadata = agcount;
622         }
623 
624         agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
625 
626         for (index = 0; index < 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, xfs_agnumber_t agcount)
652 {
653         xfs_agnumber_t index = 0;
654 
655         for (index = 0; index < 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);
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);
774                 if (!mp->m_rtdev_targp)
775                         goto out_free_ddev_targ;
776         }
777 
778         if (logdev && logdev != ddev) {
779                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
780                 if (!mp->m_logdev_targp)
781                         goto out_free_rtdev_targ;
782         } else {
783                 mp->m_logdev_targp = mp->m_ddev_targp;
784         }
785 
786         return 0;
787 
788  out_free_rtdev_targ:
789         if (mp->m_rtdev_targp)
790                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
791  out_free_ddev_targ:
792         xfs_free_buftarg(mp, mp->m_ddev_targp);
793  out_close_rtdev:
794         if (rtdev)
795                 xfs_blkdev_put(rtdev);
796  out_close_logdev:
797         if (logdev && logdev != ddev)
798                 xfs_blkdev_put(logdev);
799  out:
800         return error;
801 }
802 
803 /*
804  * Setup xfs_mount buffer target pointers based on superblock
805  */
806 STATIC int
807 xfs_setup_devices(
808         struct xfs_mount        *mp)
809 {
810         int                     error;
811 
812         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
813         if (error)
814                 return error;
815 
816         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
817                 unsigned int    log_sector_size = BBSIZE;
818 
819                 if (xfs_sb_version_hassector(&mp->m_sb))
820                         log_sector_size = mp->m_sb.sb_logsectsize;
821                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
822                                             log_sector_size);
823                 if (error)
824                         return error;
825         }
826         if (mp->m_rtdev_targp) {
827                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
828                                             mp->m_sb.sb_sectsize);
829                 if (error)
830                         return error;
831         }
832 
833         return 0;
834 }
835 
836 STATIC int
837 xfs_init_mount_workqueues(
838         struct xfs_mount        *mp)
839 {
840         mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
841                         WQ_MEM_RECLAIM, 0, mp->m_fsname);
842         if (!mp->m_data_workqueue)
843                 goto out;
844 
845         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
846                         WQ_MEM_RECLAIM, 0, mp->m_fsname);
847         if (!mp->m_unwritten_workqueue)
848                 goto out_destroy_data_iodone_queue;
849 
850         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
851                         WQ_MEM_RECLAIM, 0, mp->m_fsname);
852         if (!mp->m_cil_workqueue)
853                 goto out_destroy_unwritten;
854 
855         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
856                         0, 0, mp->m_fsname);
857         if (!mp->m_reclaim_workqueue)
858                 goto out_destroy_cil;
859 
860         mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
861                         0, 0, mp->m_fsname);
862         if (!mp->m_log_workqueue)
863                 goto out_destroy_reclaim;
864 
865         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
866                         0, 0, mp->m_fsname);
867         if (!mp->m_eofblocks_workqueue)
868                 goto out_destroy_log;
869 
870         return 0;
871 
872 out_destroy_log:
873         destroy_workqueue(mp->m_log_workqueue);
874 out_destroy_reclaim:
875         destroy_workqueue(mp->m_reclaim_workqueue);
876 out_destroy_cil:
877         destroy_workqueue(mp->m_cil_workqueue);
878 out_destroy_unwritten:
879         destroy_workqueue(mp->m_unwritten_workqueue);
880 out_destroy_data_iodone_queue:
881         destroy_workqueue(mp->m_data_workqueue);
882 out:
883         return -ENOMEM;
884 }
885 
886 STATIC void
887 xfs_destroy_mount_workqueues(
888         struct xfs_mount        *mp)
889 {
890         destroy_workqueue(mp->m_eofblocks_workqueue);
891         destroy_workqueue(mp->m_log_workqueue);
892         destroy_workqueue(mp->m_reclaim_workqueue);
893         destroy_workqueue(mp->m_cil_workqueue);
894         destroy_workqueue(mp->m_data_workqueue);
895         destroy_workqueue(mp->m_unwritten_workqueue);
896 }
897 
898 /*
899  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
900  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
901  * for IO to complete so that we effectively throttle multiple callers to the
902  * rate at which IO is completing.
903  */
904 void
905 xfs_flush_inodes(
906         struct xfs_mount        *mp)
907 {
908         struct super_block      *sb = mp->m_super;
909 
910         if (down_read_trylock(&sb->s_umount)) {
911                 sync_inodes_sb(sb);
912                 up_read(&sb->s_umount);
913         }
914 }
915 
916 /* Catch misguided souls that try to use this interface on XFS */
917 STATIC struct inode *
918 xfs_fs_alloc_inode(
919         struct super_block      *sb)
920 {
921         BUG();
922         return NULL;
923 }
924 
925 /*
926  * Now that the generic code is guaranteed not to be accessing
927  * the linux inode, we can reclaim the inode.
928  */
929 STATIC void
930 xfs_fs_destroy_inode(
931         struct inode            *inode)
932 {
933         struct xfs_inode        *ip = XFS_I(inode);
934 
935         trace_xfs_destroy_inode(ip);
936 
937         XFS_STATS_INC(vn_reclaim);
938 
939         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
940 
941         /*
942          * We should never get here with one of the reclaim flags already set.
943          */
944         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
945         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
946 
947         /*
948          * We always use background reclaim here because even if the
949          * inode is clean, it still may be under IO and hence we have
950          * to take the flush lock. The background reclaim path handles
951          * this more efficiently than we can here, so simply let background
952          * reclaim tear down all inodes.
953          */
954         xfs_inode_set_reclaim_tag(ip);
955 }
956 
957 /*
958  * Slab object creation initialisation for the XFS inode.
959  * This covers only the idempotent fields in the XFS inode;
960  * all other fields need to be initialised on allocation
961  * from the slab. This avoids the need to repeatedly initialise
962  * fields in the xfs inode that left in the initialise state
963  * when freeing the inode.
964  */
965 STATIC void
966 xfs_fs_inode_init_once(
967         void                    *inode)
968 {
969         struct xfs_inode        *ip = inode;
970 
971         memset(ip, 0, sizeof(struct xfs_inode));
972 
973         /* vfs inode */
974         inode_init_once(VFS_I(ip));
975 
976         /* xfs inode */
977         atomic_set(&ip->i_pincount, 0);
978         spin_lock_init(&ip->i_flags_lock);
979 
980         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
981                      "xfsino", ip->i_ino);
982 }
983 
984 STATIC void
985 xfs_fs_evict_inode(
986         struct inode            *inode)
987 {
988         xfs_inode_t             *ip = XFS_I(inode);
989 
990         ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
991 
992         trace_xfs_evict_inode(ip);
993 
994         truncate_inode_pages_final(&inode->i_data);
995         clear_inode(inode);
996         XFS_STATS_INC(vn_rele);
997         XFS_STATS_INC(vn_remove);
998         XFS_STATS_DEC(vn_active);
999 
1000         xfs_inactive(ip);
1001 }
1002 
1003 /*
1004  * We do an unlocked check for XFS_IDONTCACHE here because we are already
1005  * serialised against cache hits here via the inode->i_lock and igrab() in
1006  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
1007  * racing with us, and it avoids needing to grab a spinlock here for every inode
1008  * we drop the final reference on.
1009  */
1010 STATIC int
1011 xfs_fs_drop_inode(
1012         struct inode            *inode)
1013 {
1014         struct xfs_inode        *ip = XFS_I(inode);
1015 
1016         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1017 }
1018 
1019 STATIC void
1020 xfs_free_fsname(
1021         struct xfs_mount        *mp)
1022 {
1023         kfree(mp->m_fsname);
1024         kfree(mp->m_rtname);
1025         kfree(mp->m_logname);
1026 }
1027 
1028 STATIC void
1029 xfs_fs_put_super(
1030         struct super_block      *sb)
1031 {
1032         struct xfs_mount        *mp = XFS_M(sb);
1033 
1034         xfs_filestream_unmount(mp);
1035         xfs_unmountfs(mp);
1036 
1037         xfs_freesb(mp);
1038         xfs_icsb_destroy_counters(mp);
1039         xfs_destroy_mount_workqueues(mp);
1040         xfs_close_devices(mp);
1041         xfs_free_fsname(mp);
1042         kfree(mp);
1043 }
1044 
1045 STATIC int
1046 xfs_fs_sync_fs(
1047         struct super_block      *sb,
1048         int                     wait)
1049 {
1050         struct xfs_mount        *mp = XFS_M(sb);
1051 
1052         /*
1053          * Doing anything during the async pass would be counterproductive.
1054          */
1055         if (!wait)
1056                 return 0;
1057 
1058         xfs_log_force(mp, XFS_LOG_SYNC);
1059         if (laptop_mode) {
1060                 /*
1061                  * The disk must be active because we're syncing.
1062                  * We schedule log work now (now that the disk is
1063                  * active) instead of later (when it might not be).
1064                  */
1065                 flush_delayed_work(&mp->m_log->l_work);
1066         }
1067 
1068         return 0;
1069 }
1070 
1071 STATIC int
1072 xfs_fs_statfs(
1073         struct dentry           *dentry,
1074         struct kstatfs          *statp)
1075 {
1076         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1077         xfs_sb_t                *sbp = &mp->m_sb;
1078         struct xfs_inode        *ip = XFS_I(dentry->d_inode);
1079         __uint64_t              fakeinos, id;
1080         xfs_extlen_t            lsize;
1081         __int64_t               ffree;
1082 
1083         statp->f_type = XFS_SB_MAGIC;
1084         statp->f_namelen = MAXNAMELEN - 1;
1085 
1086         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1087         statp->f_fsid.val[0] = (u32)id;
1088         statp->f_fsid.val[1] = (u32)(id >> 32);
1089 
1090         xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
1091 
1092         spin_lock(&mp->m_sb_lock);
1093         statp->f_bsize = sbp->sb_blocksize;
1094         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1095         statp->f_blocks = sbp->sb_dblocks - lsize;
1096         statp->f_bfree = statp->f_bavail =
1097                                 sbp->sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1098         fakeinos = statp->f_bfree << sbp->sb_inopblog;
1099         statp->f_files =
1100             MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1101         if (mp->m_maxicount)
1102                 statp->f_files = min_t(typeof(statp->f_files),
1103                                         statp->f_files,
1104                                         mp->m_maxicount);
1105 
1106         /* make sure statp->f_ffree does not underflow */
1107         ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
1108         statp->f_ffree = max_t(__int64_t, ffree, 0);
1109 
1110         spin_unlock(&mp->m_sb_lock);
1111 
1112         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1113             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1114                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1115                 xfs_qm_statvfs(ip, statp);
1116         return 0;
1117 }
1118 
1119 STATIC void
1120 xfs_save_resvblks(struct xfs_mount *mp)
1121 {
1122         __uint64_t resblks = 0;
1123 
1124         mp->m_resblks_save = mp->m_resblks;
1125         xfs_reserve_blocks(mp, &resblks, NULL);
1126 }
1127 
1128 STATIC void
1129 xfs_restore_resvblks(struct xfs_mount *mp)
1130 {
1131         __uint64_t resblks;
1132 
1133         if (mp->m_resblks_save) {
1134                 resblks = mp->m_resblks_save;
1135                 mp->m_resblks_save = 0;
1136         } else
1137                 resblks = xfs_default_resblks(mp);
1138 
1139         xfs_reserve_blocks(mp, &resblks, NULL);
1140 }
1141 
1142 /*
1143  * Trigger writeback of all the dirty metadata in the file system.
1144  *
1145  * This ensures that the metadata is written to their location on disk rather
1146  * than just existing in transactions in the log. This means after a quiesce
1147  * there is no log replay required to write the inodes to disk - this is the
1148  * primary difference between a sync and a quiesce.
1149  *
1150  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1151  * it is started again when appropriate.
1152  */
1153 static void
1154 xfs_quiesce_attr(
1155         struct xfs_mount        *mp)
1156 {
1157         int     error = 0;
1158 
1159         /* wait for all modifications to complete */
1160         while (atomic_read(&mp->m_active_trans) > 0)
1161                 delay(100);
1162 
1163         /* force the log to unpin objects from the now complete transactions */
1164         xfs_log_force(mp, XFS_LOG_SYNC);
1165 
1166         /* reclaim inodes to do any IO before the freeze completes */
1167         xfs_reclaim_inodes(mp, 0);
1168         xfs_reclaim_inodes(mp, SYNC_WAIT);
1169 
1170         /* Push the superblock and write an unmount record */
1171         error = xfs_log_sbcount(mp);
1172         if (error)
1173                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1174                                 "Frozen image may not be consistent.");
1175         /*
1176          * Just warn here till VFS can correctly support
1177          * read-only remount without racing.
1178          */
1179         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1180 
1181         xfs_log_quiesce(mp);
1182 }
1183 
1184 STATIC int
1185 xfs_fs_remount(
1186         struct super_block      *sb,
1187         int                     *flags,
1188         char                    *options)
1189 {
1190         struct xfs_mount        *mp = XFS_M(sb);
1191         xfs_sb_t                *sbp = &mp->m_sb;
1192         substring_t             args[MAX_OPT_ARGS];
1193         char                    *p;
1194         int                     error;
1195 
1196         sync_filesystem(sb);
1197         while ((p = strsep(&options, ",")) != NULL) {
1198                 int token;
1199 
1200                 if (!*p)
1201                         continue;
1202 
1203                 token = match_token(p, tokens, args);
1204                 switch (token) {
1205                 case Opt_barrier:
1206                         mp->m_flags |= XFS_MOUNT_BARRIER;
1207                         break;
1208                 case Opt_nobarrier:
1209                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
1210                         break;
1211                 case Opt_inode64:
1212                         mp->m_maxagi = xfs_set_inode64(mp, sbp->sb_agcount);
1213                         break;
1214                 case Opt_inode32:
1215                         mp->m_maxagi = xfs_set_inode32(mp, sbp->sb_agcount);
1216                         break;
1217                 default:
1218                         /*
1219                          * Logically we would return an error here to prevent
1220                          * users from believing they might have changed
1221                          * mount options using remount which can't be changed.
1222                          *
1223                          * But unfortunately mount(8) adds all options from
1224                          * mtab and fstab to the mount arguments in some cases
1225                          * so we can't blindly reject options, but have to
1226                          * check for each specified option if it actually
1227                          * differs from the currently set option and only
1228                          * reject it if that's the case.
1229                          *
1230                          * Until that is implemented we return success for
1231                          * every remount request, and silently ignore all
1232                          * options that we can't actually change.
1233                          */
1234 #if 0
1235                         xfs_info(mp,
1236                 "mount option \"%s\" not supported for remount", p);
1237                         return -EINVAL;
1238 #else
1239                         break;
1240 #endif
1241                 }
1242         }
1243 
1244         /* ro -> rw */
1245         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1246                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1247 
1248                 /*
1249                  * If this is the first remount to writeable state we
1250                  * might have some superblock changes to update.
1251                  */
1252                 if (mp->m_update_flags) {
1253                         error = xfs_mount_log_sb(mp, mp->m_update_flags);
1254                         if (error) {
1255                                 xfs_warn(mp, "failed to write sb changes");
1256                                 return error;
1257                         }
1258                         mp->m_update_flags = 0;
1259                 }
1260 
1261                 /*
1262                  * Fill out the reserve pool if it is empty. Use the stashed
1263                  * value if it is non-zero, otherwise go with the default.
1264                  */
1265                 xfs_restore_resvblks(mp);
1266                 xfs_log_work_queue(mp);
1267         }
1268 
1269         /* rw -> ro */
1270         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1271                 /*
1272                  * Before we sync the metadata, we need to free up the reserve
1273                  * block pool so that the used block count in the superblock on
1274                  * disk is correct at the end of the remount. Stash the current
1275                  * reserve pool size so that if we get remounted rw, we can
1276                  * return it to the same size.
1277                  */
1278                 xfs_save_resvblks(mp);
1279                 xfs_quiesce_attr(mp);
1280                 mp->m_flags |= XFS_MOUNT_RDONLY;
1281         }
1282 
1283         return 0;
1284 }
1285 
1286 /*
1287  * Second stage of a freeze. The data is already frozen so we only
1288  * need to take care of the metadata. Once that's done write a dummy
1289  * record to dirty the log in case of a crash while frozen.
1290  */
1291 STATIC int
1292 xfs_fs_freeze(
1293         struct super_block      *sb)
1294 {
1295         struct xfs_mount        *mp = XFS_M(sb);
1296 
1297         xfs_save_resvblks(mp);
1298         xfs_quiesce_attr(mp);
1299         return xfs_fs_log_dummy(mp);
1300 }
1301 
1302 STATIC int
1303 xfs_fs_unfreeze(
1304         struct super_block      *sb)
1305 {
1306         struct xfs_mount        *mp = XFS_M(sb);
1307 
1308         xfs_restore_resvblks(mp);
1309         xfs_log_work_queue(mp);
1310         return 0;
1311 }
1312 
1313 STATIC int
1314 xfs_fs_show_options(
1315         struct seq_file         *m,
1316         struct dentry           *root)
1317 {
1318         return xfs_showargs(XFS_M(root->d_sb), m);
1319 }
1320 
1321 /*
1322  * This function fills in xfs_mount_t fields based on mount args.
1323  * Note: the superblock _has_ now been read in.
1324  */
1325 STATIC int
1326 xfs_finish_flags(
1327         struct xfs_mount        *mp)
1328 {
1329         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1330 
1331         /* Fail a mount where the logbuf is smaller than the log stripe */
1332         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1333                 if (mp->m_logbsize <= 0 &&
1334                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1335                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1336                 } else if (mp->m_logbsize > 0 &&
1337                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1338                         xfs_warn(mp,
1339                 "logbuf size must be greater than or equal to log stripe size");
1340                         return -EINVAL;
1341                 }
1342         } else {
1343                 /* Fail a mount if the logbuf is larger than 32K */
1344                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1345                         xfs_warn(mp,
1346                 "logbuf size for version 1 logs must be 16K or 32K");
1347                         return -EINVAL;
1348                 }
1349         }
1350 
1351         /*
1352          * V5 filesystems always use attr2 format for attributes.
1353          */
1354         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1355             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1356                 xfs_warn(mp,
1357 "Cannot mount a V5 filesystem as %s. %s is always enabled for V5 filesystems.",
1358                         MNTOPT_NOATTR2, MNTOPT_ATTR2);
1359                 return -EINVAL;
1360         }
1361 
1362         /*
1363          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1364          * told by noattr2 to turn it off
1365          */
1366         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1367             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1368                 mp->m_flags |= XFS_MOUNT_ATTR2;
1369 
1370         /*
1371          * prohibit r/w mounts of read-only filesystems
1372          */
1373         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1374                 xfs_warn(mp,
1375                         "cannot mount a read-only filesystem as read-write");
1376                 return -EROFS;
1377         }
1378 
1379         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1380             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1381             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1382                 xfs_warn(mp,
1383                   "Super block does not support project and group quota together");
1384                 return -EINVAL;
1385         }
1386 
1387         return 0;
1388 }
1389 
1390 STATIC int
1391 xfs_fs_fill_super(
1392         struct super_block      *sb,
1393         void                    *data,
1394         int                     silent)
1395 {
1396         struct inode            *root;
1397         struct xfs_mount        *mp = NULL;
1398         int                     flags = 0, error = -ENOMEM;
1399 
1400         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1401         if (!mp)
1402                 goto out;
1403 
1404         spin_lock_init(&mp->m_sb_lock);
1405         mutex_init(&mp->m_growlock);
1406         atomic_set(&mp->m_active_trans, 0);
1407         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1408         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1409 
1410         mp->m_super = sb;
1411         sb->s_fs_info = mp;
1412 
1413         error = xfs_parseargs(mp, (char *)data);
1414         if (error)
1415                 goto out_free_fsname;
1416 
1417         sb_min_blocksize(sb, BBSIZE);
1418         sb->s_xattr = xfs_xattr_handlers;
1419         sb->s_export_op = &xfs_export_operations;
1420 #ifdef CONFIG_XFS_QUOTA
1421         sb->s_qcop = &xfs_quotactl_operations;
1422 #endif
1423         sb->s_op = &xfs_super_operations;
1424 
1425         if (silent)
1426                 flags |= XFS_MFSI_QUIET;
1427 
1428         error = xfs_open_devices(mp);
1429         if (error)
1430                 goto out_free_fsname;
1431 
1432         error = xfs_init_mount_workqueues(mp);
1433         if (error)
1434                 goto out_close_devices;
1435 
1436         error = xfs_icsb_init_counters(mp);
1437         if (error)
1438                 goto out_destroy_workqueues;
1439 
1440         error = xfs_readsb(mp, flags);
1441         if (error)
1442                 goto out_destroy_counters;
1443 
1444         error = xfs_finish_flags(mp);
1445         if (error)
1446                 goto out_free_sb;
1447 
1448         error = xfs_setup_devices(mp);
1449         if (error)
1450                 goto out_free_sb;
1451 
1452         error = xfs_filestream_mount(mp);
1453         if (error)
1454                 goto out_free_sb;
1455 
1456         /*
1457          * we must configure the block size in the superblock before we run the
1458          * full mount process as the mount process can lookup and cache inodes.
1459          */
1460         sb->s_magic = XFS_SB_MAGIC;
1461         sb->s_blocksize = mp->m_sb.sb_blocksize;
1462         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1463         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1464         sb->s_max_links = XFS_MAXLINK;
1465         sb->s_time_gran = 1;
1466         set_posix_acl_flag(sb);
1467 
1468         /* version 5 superblocks support inode version counters. */
1469         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1470                 sb->s_flags |= MS_I_VERSION;
1471 
1472         error = xfs_mountfs(mp);
1473         if (error)
1474                 goto out_filestream_unmount;
1475 
1476         root = igrab(VFS_I(mp->m_rootip));
1477         if (!root) {
1478                 error = -ENOENT;
1479                 goto out_unmount;
1480         }
1481         sb->s_root = d_make_root(root);
1482         if (!sb->s_root) {
1483                 error = -ENOMEM;
1484                 goto out_unmount;
1485         }
1486 
1487         return 0;
1488 
1489  out_filestream_unmount:
1490         xfs_filestream_unmount(mp);
1491  out_free_sb:
1492         xfs_freesb(mp);
1493  out_destroy_counters:
1494         xfs_icsb_destroy_counters(mp);
1495 out_destroy_workqueues:
1496         xfs_destroy_mount_workqueues(mp);
1497  out_close_devices:
1498         xfs_close_devices(mp);
1499  out_free_fsname:
1500         xfs_free_fsname(mp);
1501         kfree(mp);
1502  out:
1503         return error;
1504 
1505  out_unmount:
1506         xfs_filestream_unmount(mp);
1507         xfs_unmountfs(mp);
1508         goto out_free_sb;
1509 }
1510 
1511 STATIC struct dentry *
1512 xfs_fs_mount(
1513         struct file_system_type *fs_type,
1514         int                     flags,
1515         const char              *dev_name,
1516         void                    *data)
1517 {
1518         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1519 }
1520 
1521 static long
1522 xfs_fs_nr_cached_objects(
1523         struct super_block      *sb,
1524         int                     nid)
1525 {
1526         return xfs_reclaim_inodes_count(XFS_M(sb));
1527 }
1528 
1529 static long
1530 xfs_fs_free_cached_objects(
1531         struct super_block      *sb,
1532         long                    nr_to_scan,
1533         int                     nid)
1534 {
1535         return xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan);
1536 }
1537 
1538 static const struct super_operations xfs_super_operations = {
1539         .alloc_inode            = xfs_fs_alloc_inode,
1540         .destroy_inode          = xfs_fs_destroy_inode,
1541         .evict_inode            = xfs_fs_evict_inode,
1542         .drop_inode             = xfs_fs_drop_inode,
1543         .put_super              = xfs_fs_put_super,
1544         .sync_fs                = xfs_fs_sync_fs,
1545         .freeze_fs              = xfs_fs_freeze,
1546         .unfreeze_fs            = xfs_fs_unfreeze,
1547         .statfs                 = xfs_fs_statfs,
1548         .remount_fs             = xfs_fs_remount,
1549         .show_options           = xfs_fs_show_options,
1550         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1551         .free_cached_objects    = xfs_fs_free_cached_objects,
1552 };
1553 
1554 static struct file_system_type xfs_fs_type = {
1555         .owner                  = THIS_MODULE,
1556         .name                   = "xfs",
1557         .mount                  = xfs_fs_mount,
1558         .kill_sb                = kill_block_super,
1559         .fs_flags               = FS_REQUIRES_DEV,
1560 };
1561 MODULE_ALIAS_FS("xfs");
1562 
1563 STATIC int __init
1564 xfs_init_zones(void)
1565 {
1566 
1567         xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
1568         if (!xfs_ioend_zone)
1569                 goto out;
1570 
1571         xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
1572                                                   xfs_ioend_zone);
1573         if (!xfs_ioend_pool)
1574                 goto out_destroy_ioend_zone;
1575 
1576         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1577                                                 "xfs_log_ticket");
1578         if (!xfs_log_ticket_zone)
1579                 goto out_destroy_ioend_pool;
1580 
1581         xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
1582                                                 "xfs_bmap_free_item");
1583         if (!xfs_bmap_free_item_zone)
1584                 goto out_destroy_log_ticket_zone;
1585 
1586         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1587                                                 "xfs_btree_cur");
1588         if (!xfs_btree_cur_zone)
1589                 goto out_destroy_bmap_free_item_zone;
1590 
1591         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1592                                                 "xfs_da_state");
1593         if (!xfs_da_state_zone)
1594                 goto out_destroy_btree_cur_zone;
1595 
1596         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1597         if (!xfs_ifork_zone)
1598                 goto out_destroy_da_state_zone;
1599 
1600         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1601         if (!xfs_trans_zone)
1602                 goto out_destroy_ifork_zone;
1603 
1604         xfs_log_item_desc_zone =
1605                 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1606                                "xfs_log_item_desc");
1607         if (!xfs_log_item_desc_zone)
1608                 goto out_destroy_trans_zone;
1609 
1610         /*
1611          * The size of the zone allocated buf log item is the maximum
1612          * size possible under XFS.  This wastes a little bit of memory,
1613          * but it is much faster.
1614          */
1615         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1616                                            "xfs_buf_item");
1617         if (!xfs_buf_item_zone)
1618                 goto out_destroy_log_item_desc_zone;
1619 
1620         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1621                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1622                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1623         if (!xfs_efd_zone)
1624                 goto out_destroy_buf_item_zone;
1625 
1626         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1627                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1628                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1629         if (!xfs_efi_zone)
1630                 goto out_destroy_efd_zone;
1631 
1632         xfs_inode_zone =
1633                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1634                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD,
1635                         xfs_fs_inode_init_once);
1636         if (!xfs_inode_zone)
1637                 goto out_destroy_efi_zone;
1638 
1639         xfs_ili_zone =
1640                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1641                                         KM_ZONE_SPREAD, NULL);
1642         if (!xfs_ili_zone)
1643                 goto out_destroy_inode_zone;
1644         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1645                                         "xfs_icr");
1646         if (!xfs_icreate_zone)
1647                 goto out_destroy_ili_zone;
1648 
1649         return 0;
1650 
1651  out_destroy_ili_zone:
1652         kmem_zone_destroy(xfs_ili_zone);
1653  out_destroy_inode_zone:
1654         kmem_zone_destroy(xfs_inode_zone);
1655  out_destroy_efi_zone:
1656         kmem_zone_destroy(xfs_efi_zone);
1657  out_destroy_efd_zone:
1658         kmem_zone_destroy(xfs_efd_zone);
1659  out_destroy_buf_item_zone:
1660         kmem_zone_destroy(xfs_buf_item_zone);
1661  out_destroy_log_item_desc_zone:
1662         kmem_zone_destroy(xfs_log_item_desc_zone);
1663  out_destroy_trans_zone:
1664         kmem_zone_destroy(xfs_trans_zone);
1665  out_destroy_ifork_zone:
1666         kmem_zone_destroy(xfs_ifork_zone);
1667  out_destroy_da_state_zone:
1668         kmem_zone_destroy(xfs_da_state_zone);
1669  out_destroy_btree_cur_zone:
1670         kmem_zone_destroy(xfs_btree_cur_zone);
1671  out_destroy_bmap_free_item_zone:
1672         kmem_zone_destroy(xfs_bmap_free_item_zone);
1673  out_destroy_log_ticket_zone:
1674         kmem_zone_destroy(xfs_log_ticket_zone);
1675  out_destroy_ioend_pool:
1676         mempool_destroy(xfs_ioend_pool);
1677  out_destroy_ioend_zone:
1678         kmem_zone_destroy(xfs_ioend_zone);
1679  out:
1680         return -ENOMEM;
1681 }
1682 
1683 STATIC void
1684 xfs_destroy_zones(void)
1685 {
1686         /*
1687          * Make sure all delayed rcu free are flushed before we
1688          * destroy caches.
1689          */
1690         rcu_barrier();
1691         kmem_zone_destroy(xfs_icreate_zone);
1692         kmem_zone_destroy(xfs_ili_zone);
1693         kmem_zone_destroy(xfs_inode_zone);
1694         kmem_zone_destroy(xfs_efi_zone);
1695         kmem_zone_destroy(xfs_efd_zone);
1696         kmem_zone_destroy(xfs_buf_item_zone);
1697         kmem_zone_destroy(xfs_log_item_desc_zone);
1698         kmem_zone_destroy(xfs_trans_zone);
1699         kmem_zone_destroy(xfs_ifork_zone);
1700         kmem_zone_destroy(xfs_da_state_zone);
1701         kmem_zone_destroy(xfs_btree_cur_zone);
1702         kmem_zone_destroy(xfs_bmap_free_item_zone);
1703         kmem_zone_destroy(xfs_log_ticket_zone);
1704         mempool_destroy(xfs_ioend_pool);
1705         kmem_zone_destroy(xfs_ioend_zone);
1706 
1707 }
1708 
1709 STATIC int __init
1710 xfs_init_workqueues(void)
1711 {
1712         /*
1713          * The allocation workqueue can be used in memory reclaim situations
1714          * (writepage path), and parallelism is only limited by the number of
1715          * AGs in all the filesystems mounted. Hence use the default large
1716          * max_active value for this workqueue.
1717          */
1718         xfs_alloc_wq = alloc_workqueue("xfsalloc", WQ_MEM_RECLAIM, 0);
1719         if (!xfs_alloc_wq)
1720                 return -ENOMEM;
1721 
1722         return 0;
1723 }
1724 
1725 STATIC void
1726 xfs_destroy_workqueues(void)
1727 {
1728         destroy_workqueue(xfs_alloc_wq);
1729 }
1730 
1731 STATIC int __init
1732 init_xfs_fs(void)
1733 {
1734         int                     error;
1735 
1736         printk(KERN_INFO XFS_VERSION_STRING " with "
1737                          XFS_BUILD_OPTIONS " enabled\n");
1738 
1739         xfs_dir_startup();
1740 
1741         error = xfs_init_zones();
1742         if (error)
1743                 goto out;
1744 
1745         error = xfs_init_workqueues();
1746         if (error)
1747                 goto out_destroy_zones;
1748 
1749         error = xfs_mru_cache_init();
1750         if (error)
1751                 goto out_destroy_wq;
1752 
1753         error = xfs_buf_init();
1754         if (error)
1755                 goto out_mru_cache_uninit;
1756 
1757         error = xfs_init_procfs();
1758         if (error)
1759                 goto out_buf_terminate;
1760 
1761         error = xfs_sysctl_register();
1762         if (error)
1763                 goto out_cleanup_procfs;
1764 
1765         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
1766         if (!xfs_kset) {
1767                 error = -ENOMEM;
1768                 goto out_sysctl_unregister;;
1769         }
1770 
1771         error = xfs_qm_init();
1772         if (error)
1773                 goto out_kset_unregister;
1774 
1775         error = register_filesystem(&xfs_fs_type);
1776         if (error)
1777                 goto out_qm_exit;
1778         return 0;
1779 
1780  out_qm_exit:
1781         xfs_qm_exit();
1782  out_kset_unregister:
1783         kset_unregister(xfs_kset);
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_mru_cache_uninit:
1791         xfs_mru_cache_uninit();
1792  out_destroy_wq:
1793         xfs_destroy_workqueues();
1794  out_destroy_zones:
1795         xfs_destroy_zones();
1796  out:
1797         return error;
1798 }
1799 
1800 STATIC void __exit
1801 exit_xfs_fs(void)
1802 {
1803         xfs_qm_exit();
1804         unregister_filesystem(&xfs_fs_type);
1805         kset_unregister(xfs_kset);
1806         xfs_sysctl_unregister();
1807         xfs_cleanup_procfs();
1808         xfs_buf_terminate();
1809         xfs_mru_cache_uninit();
1810         xfs_destroy_workqueues();
1811         xfs_destroy_zones();
1812 }
1813 
1814 module_init(init_xfs_fs);
1815 module_exit(exit_xfs_fs);
1816 
1817 MODULE_AUTHOR("Silicon Graphics, Inc.");
1818 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
1819 MODULE_LICENSE("GPL");
1820 

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