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

Version: ~ [ linux-5.8-rc4 ] ~ [ linux-5.7.7 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.50 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.131 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.187 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.229 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.229 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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_log.h"
 21 #include "xfs_inum.h"
 22 #include "xfs_trans.h"
 23 #include "xfs_sb.h"
 24 #include "xfs_ag.h"
 25 #include "xfs_dir2.h"
 26 #include "xfs_alloc.h"
 27 #include "xfs_quota.h"
 28 #include "xfs_mount.h"
 29 #include "xfs_bmap_btree.h"
 30 #include "xfs_alloc_btree.h"
 31 #include "xfs_ialloc_btree.h"
 32 #include "xfs_dinode.h"
 33 #include "xfs_inode.h"
 34 #include "xfs_btree.h"
 35 #include "xfs_ialloc.h"
 36 #include "xfs_bmap.h"
 37 #include "xfs_rtalloc.h"
 38 #include "xfs_error.h"
 39 #include "xfs_itable.h"
 40 #include "xfs_fsops.h"
 41 #include "xfs_attr.h"
 42 #include "xfs_buf_item.h"
 43 #include "xfs_utils.h"
 44 #include "xfs_vnodeops.h"
 45 #include "xfs_log_priv.h"
 46 #include "xfs_trans_priv.h"
 47 #include "xfs_filestream.h"
 48 #include "xfs_da_btree.h"
 49 #include "xfs_extfree_item.h"
 50 #include "xfs_mru_cache.h"
 51 #include "xfs_inode_item.h"
 52 #include "xfs_icache.h"
 53 #include "xfs_trace.h"
 54 #include "xfs_icreate_item.h"
 55 
 56 #include <linux/namei.h>
 57 #include <linux/init.h>
 58 #include <linux/slab.h>
 59 #include <linux/mount.h>
 60 #include <linux/mempool.h>
 61 #include <linux/writeback.h>
 62 #include <linux/kthread.h>
 63 #include <linux/freezer.h>
 64 #include <linux/parser.h>
 65 
 66 static const struct super_operations xfs_super_operations;
 67 static kmem_zone_t *xfs_ioend_zone;
 68 mempool_t *xfs_ioend_pool;
 69 
 70 #define MNTOPT_LOGBUFS  "logbufs"       /* number of XFS log buffers */
 71 #define MNTOPT_LOGBSIZE "logbsize"      /* size of XFS log buffers */
 72 #define MNTOPT_LOGDEV   "logdev"        /* log device */
 73 #define MNTOPT_RTDEV    "rtdev"         /* realtime I/O device */
 74 #define MNTOPT_BIOSIZE  "biosize"       /* log2 of preferred buffered io size */
 75 #define MNTOPT_WSYNC    "wsync"         /* safe-mode nfs compatible mount */
 76 #define MNTOPT_NOALIGN  "noalign"       /* turn off stripe alignment */
 77 #define MNTOPT_SWALLOC  "swalloc"       /* turn on stripe width allocation */
 78 #define MNTOPT_SUNIT    "sunit"         /* data volume stripe unit */
 79 #define MNTOPT_SWIDTH   "swidth"        /* data volume stripe width */
 80 #define MNTOPT_NOUUID   "nouuid"        /* ignore filesystem UUID */
 81 #define MNTOPT_MTPT     "mtpt"          /* filesystem mount point */
 82 #define MNTOPT_GRPID    "grpid"         /* group-ID from parent directory */
 83 #define MNTOPT_NOGRPID  "nogrpid"       /* group-ID from current process */
 84 #define MNTOPT_BSDGROUPS    "bsdgroups"    /* group-ID from parent directory */
 85 #define MNTOPT_SYSVGROUPS   "sysvgroups"   /* group-ID from current process */
 86 #define MNTOPT_ALLOCSIZE    "allocsize"    /* preferred allocation size */
 87 #define MNTOPT_NORECOVERY   "norecovery"   /* don't run XFS recovery */
 88 #define MNTOPT_BARRIER  "barrier"       /* use writer barriers for log write and
 89                                          * unwritten extent conversion */
 90 #define MNTOPT_NOBARRIER "nobarrier"    /* .. disable */
 91 #define MNTOPT_64BITINODE   "inode64"   /* inodes can be allocated anywhere */
 92 #define MNTOPT_32BITINODE   "inode32"   /* inode allocation limited to
 93                                          * XFS_MAXINUMBER_32 */
 94 #define MNTOPT_IKEEP    "ikeep"         /* do not free empty inode clusters */
 95 #define MNTOPT_NOIKEEP  "noikeep"       /* free empty inode clusters */
 96 #define MNTOPT_LARGEIO     "largeio"    /* report large I/O sizes in stat() */
 97 #define MNTOPT_NOLARGEIO   "nolargeio"  /* do not report large I/O sizes
 98                                          * in stat(). */
 99 #define MNTOPT_ATTR2    "attr2"         /* do use attr2 attribute format */
100 #define MNTOPT_NOATTR2  "noattr2"       /* do not use attr2 attribute format */
101 #define MNTOPT_FILESTREAM  "filestreams" /* use filestreams allocator */
102 #define MNTOPT_QUOTA    "quota"         /* disk quotas (user) */
103 #define MNTOPT_NOQUOTA  "noquota"       /* no quotas */
104 #define MNTOPT_USRQUOTA "usrquota"      /* user quota enabled */
105 #define MNTOPT_GRPQUOTA "grpquota"      /* group quota enabled */
106 #define MNTOPT_PRJQUOTA "prjquota"      /* project quota enabled */
107 #define MNTOPT_UQUOTA   "uquota"        /* user quota (IRIX variant) */
108 #define MNTOPT_GQUOTA   "gquota"        /* group quota (IRIX variant) */
109 #define MNTOPT_PQUOTA   "pquota"        /* project quota (IRIX variant) */
110 #define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */
111 #define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */
112 #define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */
113 #define MNTOPT_QUOTANOENF  "qnoenforce" /* same as uqnoenforce */
114 #define MNTOPT_DELAYLOG    "delaylog"   /* Delayed logging enabled */
115 #define MNTOPT_NODELAYLOG  "nodelaylog" /* Delayed logging disabled */
116 #define MNTOPT_DISCARD     "discard"    /* Discard unused blocks */
117 #define MNTOPT_NODISCARD   "nodiscard"  /* Do not discard unused blocks */
118 
119 /*
120  * Table driven mount option parser.
121  *
122  * Currently only used for remount, but it will be used for mount
123  * in the future, too.
124  */
125 enum {
126         Opt_barrier,
127         Opt_nobarrier,
128         Opt_inode64,
129         Opt_inode32,
130         Opt_err
131 };
132 
133 static const match_table_t tokens = {
134         {Opt_barrier, "barrier"},
135         {Opt_nobarrier, "nobarrier"},
136         {Opt_inode64, "inode64"},
137         {Opt_inode32, "inode32"},
138         {Opt_err, NULL}
139 };
140 
141 
142 STATIC unsigned long
143 suffix_kstrtoint(char *s, unsigned int base, int *res)
144 {
145         int     last, shift_left_factor = 0, _res;
146         char    *value = s;
147 
148         last = strlen(value) - 1;
149         if (value[last] == 'K' || value[last] == 'k') {
150                 shift_left_factor = 10;
151                 value[last] = '\0';
152         }
153         if (value[last] == 'M' || value[last] == 'm') {
154                 shift_left_factor = 20;
155                 value[last] = '\0';
156         }
157         if (value[last] == 'G' || value[last] == 'g') {
158                 shift_left_factor = 30;
159                 value[last] = '\0';
160         }
161 
162         if (kstrtoint(s, base, &_res))
163                 return -EINVAL;
164         *res = _res << shift_left_factor;
165         return 0;
166 }
167 
168 /*
169  * This function fills in xfs_mount_t fields based on mount args.
170  * Note: the superblock has _not_ yet been read in.
171  *
172  * Note that this function leaks the various device name allocations on
173  * failure.  The caller takes care of them.
174  */
175 STATIC int
176 xfs_parseargs(
177         struct xfs_mount        *mp,
178         char                    *options)
179 {
180         struct super_block      *sb = mp->m_super;
181         char                    *this_char, *value;
182         int                     dsunit = 0;
183         int                     dswidth = 0;
184         int                     iosize = 0;
185         __uint8_t               iosizelog = 0;
186 
187         /*
188          * set up the mount name first so all the errors will refer to the
189          * correct device.
190          */
191         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
192         if (!mp->m_fsname)
193                 return ENOMEM;
194         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
195 
196         /*
197          * Copy binary VFS mount flags we are interested in.
198          */
199         if (sb->s_flags & MS_RDONLY)
200                 mp->m_flags |= XFS_MOUNT_RDONLY;
201         if (sb->s_flags & MS_DIRSYNC)
202                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
203         if (sb->s_flags & MS_SYNCHRONOUS)
204                 mp->m_flags |= XFS_MOUNT_WSYNC;
205 
206         /*
207          * Set some default flags that could be cleared by the mount option
208          * parsing.
209          */
210         mp->m_flags |= XFS_MOUNT_BARRIER;
211         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
212 #if !XFS_BIG_INUMS
213         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
214 #endif
215 
216         /*
217          * These can be overridden by the mount option parsing.
218          */
219         mp->m_logbufs = -1;
220         mp->m_logbsize = -1;
221 
222         if (!options)
223                 goto done;
224 
225         while ((this_char = strsep(&options, ",")) != NULL) {
226                 if (!*this_char)
227                         continue;
228                 if ((value = strchr(this_char, '=')) != NULL)
229                         *value++ = 0;
230 
231                 if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
232                         if (!value || !*value) {
233                                 xfs_warn(mp, "%s option requires an argument",
234                                         this_char);
235                                 return EINVAL;
236                         }
237                         if (kstrtoint(value, 10, &mp->m_logbufs))
238                                 return EINVAL;
239                 } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
240                         if (!value || !*value) {
241                                 xfs_warn(mp, "%s option requires an argument",
242                                         this_char);
243                                 return EINVAL;
244                         }
245                         if (suffix_kstrtoint(value, 10, &mp->m_logbsize))
246                                 return EINVAL;
247                 } else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
248                         if (!value || !*value) {
249                                 xfs_warn(mp, "%s option requires an argument",
250                                         this_char);
251                                 return EINVAL;
252                         }
253                         mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
254                         if (!mp->m_logname)
255                                 return ENOMEM;
256                 } else if (!strcmp(this_char, MNTOPT_MTPT)) {
257                         xfs_warn(mp, "%s option not allowed on this system",
258                                 this_char);
259                         return EINVAL;
260                 } else if (!strcmp(this_char, MNTOPT_RTDEV)) {
261                         if (!value || !*value) {
262                                 xfs_warn(mp, "%s option requires an argument",
263                                         this_char);
264                                 return EINVAL;
265                         }
266                         mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
267                         if (!mp->m_rtname)
268                                 return ENOMEM;
269                 } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
270                         if (!value || !*value) {
271                                 xfs_warn(mp, "%s option requires an argument",
272                                         this_char);
273                                 return EINVAL;
274                         }
275                         if (kstrtoint(value, 10, &iosize))
276                                 return EINVAL;
277                         iosizelog = ffs(iosize) - 1;
278                 } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
279                         if (!value || !*value) {
280                                 xfs_warn(mp, "%s option requires an argument",
281                                         this_char);
282                                 return EINVAL;
283                         }
284                         if (suffix_kstrtoint(value, 10, &iosize))
285                                 return EINVAL;
286                         iosizelog = ffs(iosize) - 1;
287                 } else if (!strcmp(this_char, MNTOPT_GRPID) ||
288                            !strcmp(this_char, MNTOPT_BSDGROUPS)) {
289                         mp->m_flags |= XFS_MOUNT_GRPID;
290                 } else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
291                            !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
292                         mp->m_flags &= ~XFS_MOUNT_GRPID;
293                 } else if (!strcmp(this_char, MNTOPT_WSYNC)) {
294                         mp->m_flags |= XFS_MOUNT_WSYNC;
295                 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
296                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
297                 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
298                         mp->m_flags |= XFS_MOUNT_NOALIGN;
299                 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
300                         mp->m_flags |= XFS_MOUNT_SWALLOC;
301                 } else if (!strcmp(this_char, MNTOPT_SUNIT)) {
302                         if (!value || !*value) {
303                                 xfs_warn(mp, "%s option requires an argument",
304                                         this_char);
305                                 return EINVAL;
306                         }
307                         if (kstrtoint(value, 10, &dsunit))
308                                 return EINVAL;
309                 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
310                         if (!value || !*value) {
311                                 xfs_warn(mp, "%s option requires an argument",
312                                         this_char);
313                                 return EINVAL;
314                         }
315                         if (kstrtoint(value, 10, &dswidth))
316                                 return EINVAL;
317                 } else if (!strcmp(this_char, MNTOPT_32BITINODE)) {
318                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
319                 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
320                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
321 #if !XFS_BIG_INUMS
322                         xfs_warn(mp, "%s option not allowed on this system",
323                                 this_char);
324                         return EINVAL;
325 #endif
326                 } else if (!strcmp(this_char, MNTOPT_NOUUID)) {
327                         mp->m_flags |= XFS_MOUNT_NOUUID;
328                 } else if (!strcmp(this_char, MNTOPT_BARRIER)) {
329                         mp->m_flags |= XFS_MOUNT_BARRIER;
330                 } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
331                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
332                 } else if (!strcmp(this_char, MNTOPT_IKEEP)) {
333                         mp->m_flags |= XFS_MOUNT_IKEEP;
334                 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
335                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
336                 } else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
337                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
338                 } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
339                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
340                 } else if (!strcmp(this_char, MNTOPT_ATTR2)) {
341                         mp->m_flags |= XFS_MOUNT_ATTR2;
342                 } else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
343                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
344                         mp->m_flags |= XFS_MOUNT_NOATTR2;
345                 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
346                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
347                 } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
348                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
349                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
350                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
351                 } else if (!strcmp(this_char, MNTOPT_QUOTA) ||
352                            !strcmp(this_char, MNTOPT_UQUOTA) ||
353                            !strcmp(this_char, MNTOPT_USRQUOTA)) {
354                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
355                                          XFS_UQUOTA_ENFD);
356                 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
357                            !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
358                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
359                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
360                 } else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
361                            !strcmp(this_char, MNTOPT_PRJQUOTA)) {
362                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
363                                          XFS_PQUOTA_ENFD);
364                 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
365                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
366                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
367                 } else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
368                            !strcmp(this_char, MNTOPT_GRPQUOTA)) {
369                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
370                                          XFS_GQUOTA_ENFD);
371                 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
372                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
373                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
374                 } else if (!strcmp(this_char, MNTOPT_DELAYLOG)) {
375                         xfs_warn(mp,
376         "delaylog is the default now, option is deprecated.");
377                 } else if (!strcmp(this_char, MNTOPT_NODELAYLOG)) {
378                         xfs_warn(mp,
379         "nodelaylog support has been removed, option is deprecated.");
380                 } else if (!strcmp(this_char, MNTOPT_DISCARD)) {
381                         mp->m_flags |= XFS_MOUNT_DISCARD;
382                 } else if (!strcmp(this_char, MNTOPT_NODISCARD)) {
383                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
384                 } else if (!strcmp(this_char, "ihashsize")) {
385                         xfs_warn(mp,
386         "ihashsize no longer used, option is deprecated.");
387                 } else if (!strcmp(this_char, "osyncisdsync")) {
388                         xfs_warn(mp,
389         "osyncisdsync has no effect, option is deprecated.");
390                 } else if (!strcmp(this_char, "osyncisosync")) {
391                         xfs_warn(mp,
392         "osyncisosync has no effect, option is deprecated.");
393                 } else if (!strcmp(this_char, "irixsgid")) {
394                         xfs_warn(mp,
395         "irixsgid is now a sysctl(2) variable, option is deprecated.");
396                 } else {
397                         xfs_warn(mp, "unknown mount option [%s].", this_char);
398                         return EINVAL;
399                 }
400         }
401 
402         /*
403          * no recovery flag requires a read-only mount
404          */
405         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
406             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
407                 xfs_warn(mp, "no-recovery mounts must be read-only.");
408                 return EINVAL;
409         }
410 
411         if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
412                 xfs_warn(mp,
413         "sunit and swidth options incompatible with the noalign option");
414                 return EINVAL;
415         }
416 
417 #ifndef CONFIG_XFS_QUOTA
418         if (XFS_IS_QUOTA_RUNNING(mp)) {
419                 xfs_warn(mp, "quota support not available in this kernel.");
420                 return EINVAL;
421         }
422 #endif
423 
424         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
425             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE))) {
426                 xfs_warn(mp, "cannot mount with both project and group quota");
427                 return EINVAL;
428         }
429 
430         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
431                 xfs_warn(mp, "sunit and swidth must be specified together");
432                 return EINVAL;
433         }
434 
435         if (dsunit && (dswidth % dsunit != 0)) {
436                 xfs_warn(mp,
437         "stripe width (%d) must be a multiple of the stripe unit (%d)",
438                         dswidth, dsunit);
439                 return EINVAL;
440         }
441 
442 done:
443         if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
444                 /*
445                  * At this point the superblock has not been read
446                  * in, therefore we do not know the block size.
447                  * Before the mount call ends we will convert
448                  * these to FSBs.
449                  */
450                 mp->m_dalign = dsunit;
451                 mp->m_swidth = dswidth;
452         }
453 
454         if (mp->m_logbufs != -1 &&
455             mp->m_logbufs != 0 &&
456             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
457              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
458                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
459                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
460                 return XFS_ERROR(EINVAL);
461         }
462         if (mp->m_logbsize != -1 &&
463             mp->m_logbsize !=  0 &&
464             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
465              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
466              !is_power_of_2(mp->m_logbsize))) {
467                 xfs_warn(mp,
468                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
469                         mp->m_logbsize);
470                 return XFS_ERROR(EINVAL);
471         }
472 
473         if (iosizelog) {
474                 if (iosizelog > XFS_MAX_IO_LOG ||
475                     iosizelog < XFS_MIN_IO_LOG) {
476                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
477                                 iosizelog, XFS_MIN_IO_LOG,
478                                 XFS_MAX_IO_LOG);
479                         return XFS_ERROR(EINVAL);
480                 }
481 
482                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
483                 mp->m_readio_log = iosizelog;
484                 mp->m_writeio_log = iosizelog;
485         }
486 
487         return 0;
488 }
489 
490 struct proc_xfs_info {
491         int     flag;
492         char    *str;
493 };
494 
495 STATIC int
496 xfs_showargs(
497         struct xfs_mount        *mp,
498         struct seq_file         *m)
499 {
500         static struct proc_xfs_info xfs_info_set[] = {
501                 /* the few simple ones we can get from the mount struct */
502                 { XFS_MOUNT_IKEEP,              "," MNTOPT_IKEEP },
503                 { XFS_MOUNT_WSYNC,              "," MNTOPT_WSYNC },
504                 { XFS_MOUNT_NOALIGN,            "," MNTOPT_NOALIGN },
505                 { XFS_MOUNT_SWALLOC,            "," MNTOPT_SWALLOC },
506                 { XFS_MOUNT_NOUUID,             "," MNTOPT_NOUUID },
507                 { XFS_MOUNT_NORECOVERY,         "," MNTOPT_NORECOVERY },
508                 { XFS_MOUNT_ATTR2,              "," MNTOPT_ATTR2 },
509                 { XFS_MOUNT_FILESTREAMS,        "," MNTOPT_FILESTREAM },
510                 { XFS_MOUNT_GRPID,              "," MNTOPT_GRPID },
511                 { XFS_MOUNT_DISCARD,            "," MNTOPT_DISCARD },
512                 { XFS_MOUNT_SMALL_INUMS,        "," MNTOPT_32BITINODE },
513                 { 0, NULL }
514         };
515         static struct proc_xfs_info xfs_info_unset[] = {
516                 /* the few simple ones we can get from the mount struct */
517                 { XFS_MOUNT_COMPAT_IOSIZE,      "," MNTOPT_LARGEIO },
518                 { XFS_MOUNT_BARRIER,            "," MNTOPT_NOBARRIER },
519                 { XFS_MOUNT_SMALL_INUMS,        "," MNTOPT_64BITINODE },
520                 { 0, NULL }
521         };
522         struct proc_xfs_info    *xfs_infop;
523 
524         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
525                 if (mp->m_flags & xfs_infop->flag)
526                         seq_puts(m, xfs_infop->str);
527         }
528         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
529                 if (!(mp->m_flags & xfs_infop->flag))
530                         seq_puts(m, xfs_infop->str);
531         }
532 
533         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
534                 seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk",
535                                 (int)(1 << mp->m_writeio_log) >> 10);
536 
537         if (mp->m_logbufs > 0)
538                 seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
539         if (mp->m_logbsize > 0)
540                 seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10);
541 
542         if (mp->m_logname)
543                 seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname);
544         if (mp->m_rtname)
545                 seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname);
546 
547         if (mp->m_dalign > 0)
548                 seq_printf(m, "," MNTOPT_SUNIT "=%d",
549                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
550         if (mp->m_swidth > 0)
551                 seq_printf(m, "," MNTOPT_SWIDTH "=%d",
552                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
553 
554         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
555                 seq_puts(m, "," MNTOPT_USRQUOTA);
556         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
557                 seq_puts(m, "," MNTOPT_UQUOTANOENF);
558 
559         /* Either project or group quotas can be active, not both */
560 
561         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
562                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
563                         seq_puts(m, "," MNTOPT_PRJQUOTA);
564                 else
565                         seq_puts(m, "," MNTOPT_PQUOTANOENF);
566         } else if (mp->m_qflags & XFS_GQUOTA_ACCT) {
567                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
568                         seq_puts(m, "," MNTOPT_GRPQUOTA);
569                 else
570                         seq_puts(m, "," MNTOPT_GQUOTANOENF);
571         }
572 
573         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
574                 seq_puts(m, "," MNTOPT_NOQUOTA);
575 
576         return 0;
577 }
578 __uint64_t
579 xfs_max_file_offset(
580         unsigned int            blockshift)
581 {
582         unsigned int            pagefactor = 1;
583         unsigned int            bitshift = BITS_PER_LONG - 1;
584 
585         /* Figure out maximum filesize, on Linux this can depend on
586          * the filesystem blocksize (on 32 bit platforms).
587          * __block_write_begin does this in an [unsigned] long...
588          *      page->index << (PAGE_CACHE_SHIFT - bbits)
589          * So, for page sized blocks (4K on 32 bit platforms),
590          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
591          *      (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
592          * but for smaller blocksizes it is less (bbits = log2 bsize).
593          * Note1: get_block_t takes a long (implicit cast from above)
594          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
595          * can optionally convert the [unsigned] long from above into
596          * an [unsigned] long long.
597          */
598 
599 #if BITS_PER_LONG == 32
600 # if defined(CONFIG_LBDAF)
601         ASSERT(sizeof(sector_t) == 8);
602         pagefactor = PAGE_CACHE_SIZE;
603         bitshift = BITS_PER_LONG;
604 # else
605         pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
606 # endif
607 #endif
608 
609         return (((__uint64_t)pagefactor) << bitshift) - 1;
610 }
611 
612 xfs_agnumber_t
613 xfs_set_inode32(struct xfs_mount *mp)
614 {
615         xfs_agnumber_t  index = 0;
616         xfs_agnumber_t  maxagi = 0;
617         xfs_sb_t        *sbp = &mp->m_sb;
618         xfs_agnumber_t  max_metadata;
619         xfs_agino_t     agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks -1, 0);
620         xfs_ino_t       ino = XFS_AGINO_TO_INO(mp, sbp->sb_agcount -1, agino);
621         xfs_perag_t     *pag;
622 
623         /* Calculate how much should be reserved for inodes to meet
624          * the max inode percentage.
625          */
626         if (mp->m_maxicount) {
627                 __uint64_t      icount;
628 
629                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
630                 do_div(icount, 100);
631                 icount += sbp->sb_agblocks - 1;
632                 do_div(icount, sbp->sb_agblocks);
633                 max_metadata = icount;
634         } else {
635                 max_metadata = sbp->sb_agcount;
636         }
637 
638         for (index = 0; index < sbp->sb_agcount; index++) {
639                 ino = XFS_AGINO_TO_INO(mp, index, agino);
640 
641                 if (ino > XFS_MAXINUMBER_32) {
642                         pag = xfs_perag_get(mp, index);
643                         pag->pagi_inodeok = 0;
644                         pag->pagf_metadata = 0;
645                         xfs_perag_put(pag);
646                         continue;
647                 }
648 
649                 pag = xfs_perag_get(mp, index);
650                 pag->pagi_inodeok = 1;
651                 maxagi++;
652                 if (index < max_metadata)
653                         pag->pagf_metadata = 1;
654                 xfs_perag_put(pag);
655         }
656         mp->m_flags |= (XFS_MOUNT_32BITINODES |
657                         XFS_MOUNT_SMALL_INUMS);
658 
659         return maxagi;
660 }
661 
662 xfs_agnumber_t
663 xfs_set_inode64(struct xfs_mount *mp)
664 {
665         xfs_agnumber_t index = 0;
666 
667         for (index = 0; index < mp->m_sb.sb_agcount; index++) {
668                 struct xfs_perag        *pag;
669 
670                 pag = xfs_perag_get(mp, index);
671                 pag->pagi_inodeok = 1;
672                 pag->pagf_metadata = 0;
673                 xfs_perag_put(pag);
674         }
675 
676         /* There is no need for lock protection on m_flags,
677          * the rw_semaphore of the VFS superblock is locked
678          * during mount/umount/remount operations, so this is
679          * enough to avoid concurency on the m_flags field
680          */
681         mp->m_flags &= ~(XFS_MOUNT_32BITINODES |
682                          XFS_MOUNT_SMALL_INUMS);
683         return index;
684 }
685 
686 STATIC int
687 xfs_blkdev_get(
688         xfs_mount_t             *mp,
689         const char              *name,
690         struct block_device     **bdevp)
691 {
692         int                     error = 0;
693 
694         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
695                                     mp);
696         if (IS_ERR(*bdevp)) {
697                 error = PTR_ERR(*bdevp);
698                 xfs_warn(mp, "Invalid device [%s], error=%d\n", name, error);
699         }
700 
701         return -error;
702 }
703 
704 STATIC void
705 xfs_blkdev_put(
706         struct block_device     *bdev)
707 {
708         if (bdev)
709                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
710 }
711 
712 void
713 xfs_blkdev_issue_flush(
714         xfs_buftarg_t           *buftarg)
715 {
716         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
717 }
718 
719 STATIC void
720 xfs_close_devices(
721         struct xfs_mount        *mp)
722 {
723         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
724                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
725                 xfs_free_buftarg(mp, mp->m_logdev_targp);
726                 xfs_blkdev_put(logdev);
727         }
728         if (mp->m_rtdev_targp) {
729                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
730                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
731                 xfs_blkdev_put(rtdev);
732         }
733         xfs_free_buftarg(mp, mp->m_ddev_targp);
734 }
735 
736 /*
737  * The file system configurations are:
738  *      (1) device (partition) with data and internal log
739  *      (2) logical volume with data and log subvolumes.
740  *      (3) logical volume with data, log, and realtime subvolumes.
741  *
742  * We only have to handle opening the log and realtime volumes here if
743  * they are present.  The data subvolume has already been opened by
744  * get_sb_bdev() and is stored in sb->s_bdev.
745  */
746 STATIC int
747 xfs_open_devices(
748         struct xfs_mount        *mp)
749 {
750         struct block_device     *ddev = mp->m_super->s_bdev;
751         struct block_device     *logdev = NULL, *rtdev = NULL;
752         int                     error;
753 
754         /*
755          * Open real time and log devices - order is important.
756          */
757         if (mp->m_logname) {
758                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
759                 if (error)
760                         goto out;
761         }
762 
763         if (mp->m_rtname) {
764                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
765                 if (error)
766                         goto out_close_logdev;
767 
768                 if (rtdev == ddev || rtdev == logdev) {
769                         xfs_warn(mp,
770         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
771                         error = EINVAL;
772                         goto out_close_rtdev;
773                 }
774         }
775 
776         /*
777          * Setup xfs_mount buffer target pointers
778          */
779         error = ENOMEM;
780         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, 0, mp->m_fsname);
781         if (!mp->m_ddev_targp)
782                 goto out_close_rtdev;
783 
784         if (rtdev) {
785                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, 1,
786                                                         mp->m_fsname);
787                 if (!mp->m_rtdev_targp)
788                         goto out_free_ddev_targ;
789         }
790 
791         if (logdev && logdev != ddev) {
792                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, 1,
793                                                         mp->m_fsname);
794                 if (!mp->m_logdev_targp)
795                         goto out_free_rtdev_targ;
796         } else {
797                 mp->m_logdev_targp = mp->m_ddev_targp;
798         }
799 
800         return 0;
801 
802  out_free_rtdev_targ:
803         if (mp->m_rtdev_targp)
804                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
805  out_free_ddev_targ:
806         xfs_free_buftarg(mp, mp->m_ddev_targp);
807  out_close_rtdev:
808         if (rtdev)
809                 xfs_blkdev_put(rtdev);
810  out_close_logdev:
811         if (logdev && logdev != ddev)
812                 xfs_blkdev_put(logdev);
813  out:
814         return error;
815 }
816 
817 /*
818  * Setup xfs_mount buffer target pointers based on superblock
819  */
820 STATIC int
821 xfs_setup_devices(
822         struct xfs_mount        *mp)
823 {
824         int                     error;
825 
826         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_blocksize,
827                                     mp->m_sb.sb_sectsize);
828         if (error)
829                 return error;
830 
831         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
832                 unsigned int    log_sector_size = BBSIZE;
833 
834                 if (xfs_sb_version_hassector(&mp->m_sb))
835                         log_sector_size = mp->m_sb.sb_logsectsize;
836                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
837                                             mp->m_sb.sb_blocksize,
838                                             log_sector_size);
839                 if (error)
840                         return error;
841         }
842         if (mp->m_rtdev_targp) {
843                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
844                                             mp->m_sb.sb_blocksize,
845                                             mp->m_sb.sb_sectsize);
846                 if (error)
847                         return error;
848         }
849 
850         return 0;
851 }
852 
853 STATIC int
854 xfs_init_mount_workqueues(
855         struct xfs_mount        *mp)
856 {
857         mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
858                         WQ_MEM_RECLAIM, 0, mp->m_fsname);
859         if (!mp->m_data_workqueue)
860                 goto out;
861 
862         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
863                         WQ_MEM_RECLAIM, 0, mp->m_fsname);
864         if (!mp->m_unwritten_workqueue)
865                 goto out_destroy_data_iodone_queue;
866 
867         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
868                         WQ_MEM_RECLAIM, 0, mp->m_fsname);
869         if (!mp->m_cil_workqueue)
870                 goto out_destroy_unwritten;
871 
872         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
873                         WQ_NON_REENTRANT, 0, mp->m_fsname);
874         if (!mp->m_reclaim_workqueue)
875                 goto out_destroy_cil;
876 
877         mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
878                         WQ_NON_REENTRANT, 0, mp->m_fsname);
879         if (!mp->m_log_workqueue)
880                 goto out_destroy_reclaim;
881 
882         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
883                         WQ_NON_REENTRANT, 0, mp->m_fsname);
884         if (!mp->m_eofblocks_workqueue)
885                 goto out_destroy_log;
886 
887         return 0;
888 
889 out_destroy_log:
890         destroy_workqueue(mp->m_log_workqueue);
891 out_destroy_reclaim:
892         destroy_workqueue(mp->m_reclaim_workqueue);
893 out_destroy_cil:
894         destroy_workqueue(mp->m_cil_workqueue);
895 out_destroy_unwritten:
896         destroy_workqueue(mp->m_unwritten_workqueue);
897 out_destroy_data_iodone_queue:
898         destroy_workqueue(mp->m_data_workqueue);
899 out:
900         return -ENOMEM;
901 }
902 
903 STATIC void
904 xfs_destroy_mount_workqueues(
905         struct xfs_mount        *mp)
906 {
907         destroy_workqueue(mp->m_eofblocks_workqueue);
908         destroy_workqueue(mp->m_log_workqueue);
909         destroy_workqueue(mp->m_reclaim_workqueue);
910         destroy_workqueue(mp->m_cil_workqueue);
911         destroy_workqueue(mp->m_data_workqueue);
912         destroy_workqueue(mp->m_unwritten_workqueue);
913 }
914 
915 /*
916  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
917  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
918  * for IO to complete so that we effectively throttle multiple callers to the
919  * rate at which IO is completing.
920  */
921 void
922 xfs_flush_inodes(
923         struct xfs_mount        *mp)
924 {
925         struct super_block      *sb = mp->m_super;
926 
927         if (down_read_trylock(&sb->s_umount)) {
928                 sync_inodes_sb(sb);
929                 up_read(&sb->s_umount);
930         }
931 }
932 
933 /* Catch misguided souls that try to use this interface on XFS */
934 STATIC struct inode *
935 xfs_fs_alloc_inode(
936         struct super_block      *sb)
937 {
938         BUG();
939         return NULL;
940 }
941 
942 /*
943  * Now that the generic code is guaranteed not to be accessing
944  * the linux inode, we can reclaim the inode.
945  */
946 STATIC void
947 xfs_fs_destroy_inode(
948         struct inode            *inode)
949 {
950         struct xfs_inode        *ip = XFS_I(inode);
951 
952         trace_xfs_destroy_inode(ip);
953 
954         XFS_STATS_INC(vn_reclaim);
955 
956         /* bad inode, get out here ASAP */
957         if (is_bad_inode(inode))
958                 goto out_reclaim;
959 
960         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
961 
962         /*
963          * We should never get here with one of the reclaim flags already set.
964          */
965         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
966         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
967 
968         /*
969          * We always use background reclaim here because even if the
970          * inode is clean, it still may be under IO and hence we have
971          * to take the flush lock. The background reclaim path handles
972          * this more efficiently than we can here, so simply let background
973          * reclaim tear down all inodes.
974          */
975 out_reclaim:
976         xfs_inode_set_reclaim_tag(ip);
977 }
978 
979 /*
980  * Slab object creation initialisation for the XFS inode.
981  * This covers only the idempotent fields in the XFS inode;
982  * all other fields need to be initialised on allocation
983  * from the slab. This avoids the need to repeatedly initialise
984  * fields in the xfs inode that left in the initialise state
985  * when freeing the inode.
986  */
987 STATIC void
988 xfs_fs_inode_init_once(
989         void                    *inode)
990 {
991         struct xfs_inode        *ip = inode;
992 
993         memset(ip, 0, sizeof(struct xfs_inode));
994 
995         /* vfs inode */
996         inode_init_once(VFS_I(ip));
997 
998         /* xfs inode */
999         atomic_set(&ip->i_pincount, 0);
1000         spin_lock_init(&ip->i_flags_lock);
1001 
1002         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1003                      "xfsino", ip->i_ino);
1004 }
1005 
1006 STATIC void
1007 xfs_fs_evict_inode(
1008         struct inode            *inode)
1009 {
1010         xfs_inode_t             *ip = XFS_I(inode);
1011 
1012         ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
1013 
1014         trace_xfs_evict_inode(ip);
1015 
1016         truncate_inode_pages(&inode->i_data, 0);
1017         clear_inode(inode);
1018         XFS_STATS_INC(vn_rele);
1019         XFS_STATS_INC(vn_remove);
1020         XFS_STATS_DEC(vn_active);
1021 
1022         xfs_inactive(ip);
1023 }
1024 
1025 /*
1026  * We do an unlocked check for XFS_IDONTCACHE here because we are already
1027  * serialised against cache hits here via the inode->i_lock and igrab() in
1028  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
1029  * racing with us, and it avoids needing to grab a spinlock here for every inode
1030  * we drop the final reference on.
1031  */
1032 STATIC int
1033 xfs_fs_drop_inode(
1034         struct inode            *inode)
1035 {
1036         struct xfs_inode        *ip = XFS_I(inode);
1037 
1038         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1039 }
1040 
1041 STATIC void
1042 xfs_free_fsname(
1043         struct xfs_mount        *mp)
1044 {
1045         kfree(mp->m_fsname);
1046         kfree(mp->m_rtname);
1047         kfree(mp->m_logname);
1048 }
1049 
1050 STATIC void
1051 xfs_fs_put_super(
1052         struct super_block      *sb)
1053 {
1054         struct xfs_mount        *mp = XFS_M(sb);
1055 
1056         xfs_filestream_unmount(mp);
1057         xfs_unmountfs(mp);
1058 
1059         xfs_freesb(mp);
1060         xfs_icsb_destroy_counters(mp);
1061         xfs_destroy_mount_workqueues(mp);
1062         xfs_close_devices(mp);
1063         xfs_free_fsname(mp);
1064         kfree(mp);
1065 }
1066 
1067 STATIC int
1068 xfs_fs_sync_fs(
1069         struct super_block      *sb,
1070         int                     wait)
1071 {
1072         struct xfs_mount        *mp = XFS_M(sb);
1073 
1074         /*
1075          * Doing anything during the async pass would be counterproductive.
1076          */
1077         if (!wait)
1078                 return 0;
1079 
1080         xfs_log_force(mp, XFS_LOG_SYNC);
1081         if (laptop_mode) {
1082                 /*
1083                  * The disk must be active because we're syncing.
1084                  * We schedule log work now (now that the disk is
1085                  * active) instead of later (when it might not be).
1086                  */
1087                 flush_delayed_work(&mp->m_log->l_work);
1088         }
1089 
1090         return 0;
1091 }
1092 
1093 STATIC int
1094 xfs_fs_statfs(
1095         struct dentry           *dentry,
1096         struct kstatfs          *statp)
1097 {
1098         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1099         xfs_sb_t                *sbp = &mp->m_sb;
1100         struct xfs_inode        *ip = XFS_I(dentry->d_inode);
1101         __uint64_t              fakeinos, id;
1102         xfs_extlen_t            lsize;
1103         __int64_t               ffree;
1104 
1105         statp->f_type = XFS_SB_MAGIC;
1106         statp->f_namelen = MAXNAMELEN - 1;
1107 
1108         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1109         statp->f_fsid.val[0] = (u32)id;
1110         statp->f_fsid.val[1] = (u32)(id >> 32);
1111 
1112         xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
1113 
1114         spin_lock(&mp->m_sb_lock);
1115         statp->f_bsize = sbp->sb_blocksize;
1116         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1117         statp->f_blocks = sbp->sb_dblocks - lsize;
1118         statp->f_bfree = statp->f_bavail =
1119                                 sbp->sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1120         fakeinos = statp->f_bfree << sbp->sb_inopblog;
1121         statp->f_files =
1122             MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1123         if (mp->m_maxicount)
1124                 statp->f_files = min_t(typeof(statp->f_files),
1125                                         statp->f_files,
1126                                         mp->m_maxicount);
1127 
1128         /* make sure statp->f_ffree does not underflow */
1129         ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
1130         statp->f_ffree = max_t(__int64_t, ffree, 0);
1131 
1132         spin_unlock(&mp->m_sb_lock);
1133 
1134         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1135             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1136                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1137                 xfs_qm_statvfs(ip, statp);
1138         return 0;
1139 }
1140 
1141 STATIC void
1142 xfs_save_resvblks(struct xfs_mount *mp)
1143 {
1144         __uint64_t resblks = 0;
1145 
1146         mp->m_resblks_save = mp->m_resblks;
1147         xfs_reserve_blocks(mp, &resblks, NULL);
1148 }
1149 
1150 STATIC void
1151 xfs_restore_resvblks(struct xfs_mount *mp)
1152 {
1153         __uint64_t resblks;
1154 
1155         if (mp->m_resblks_save) {
1156                 resblks = mp->m_resblks_save;
1157                 mp->m_resblks_save = 0;
1158         } else
1159                 resblks = xfs_default_resblks(mp);
1160 
1161         xfs_reserve_blocks(mp, &resblks, NULL);
1162 }
1163 
1164 /*
1165  * Trigger writeback of all the dirty metadata in the file system.
1166  *
1167  * This ensures that the metadata is written to their location on disk rather
1168  * than just existing in transactions in the log. This means after a quiesce
1169  * there is no log replay required to write the inodes to disk - this is the
1170  * primary difference between a sync and a quiesce.
1171  *
1172  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1173  * it is started again when appropriate.
1174  */
1175 void
1176 xfs_quiesce_attr(
1177         struct xfs_mount        *mp)
1178 {
1179         int     error = 0;
1180 
1181         /* wait for all modifications to complete */
1182         while (atomic_read(&mp->m_active_trans) > 0)
1183                 delay(100);
1184 
1185         /* force the log to unpin objects from the now complete transactions */
1186         xfs_log_force(mp, XFS_LOG_SYNC);
1187 
1188         /* reclaim inodes to do any IO before the freeze completes */
1189         xfs_reclaim_inodes(mp, 0);
1190         xfs_reclaim_inodes(mp, SYNC_WAIT);
1191 
1192         /* Push the superblock and write an unmount record */
1193         error = xfs_log_sbcount(mp);
1194         if (error)
1195                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1196                                 "Frozen image may not be consistent.");
1197         /*
1198          * Just warn here till VFS can correctly support
1199          * read-only remount without racing.
1200          */
1201         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1202 
1203         xfs_log_quiesce(mp);
1204 }
1205 
1206 STATIC int
1207 xfs_fs_remount(
1208         struct super_block      *sb,
1209         int                     *flags,
1210         char                    *options)
1211 {
1212         struct xfs_mount        *mp = XFS_M(sb);
1213         substring_t             args[MAX_OPT_ARGS];
1214         char                    *p;
1215         int                     error;
1216 
1217         while ((p = strsep(&options, ",")) != NULL) {
1218                 int token;
1219 
1220                 if (!*p)
1221                         continue;
1222 
1223                 token = match_token(p, tokens, args);
1224                 switch (token) {
1225                 case Opt_barrier:
1226                         mp->m_flags |= XFS_MOUNT_BARRIER;
1227                         break;
1228                 case Opt_nobarrier:
1229                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
1230                         break;
1231                 case Opt_inode64:
1232                         mp->m_maxagi = xfs_set_inode64(mp);
1233                         break;
1234                 case Opt_inode32:
1235                         mp->m_maxagi = xfs_set_inode32(mp);
1236                         break;
1237                 default:
1238                         /*
1239                          * Logically we would return an error here to prevent
1240                          * users from believing they might have changed
1241                          * mount options using remount which can't be changed.
1242                          *
1243                          * But unfortunately mount(8) adds all options from
1244                          * mtab and fstab to the mount arguments in some cases
1245                          * so we can't blindly reject options, but have to
1246                          * check for each specified option if it actually
1247                          * differs from the currently set option and only
1248                          * reject it if that's the case.
1249                          *
1250                          * Until that is implemented we return success for
1251                          * every remount request, and silently ignore all
1252                          * options that we can't actually change.
1253                          */
1254 #if 0
1255                         xfs_info(mp,
1256                 "mount option \"%s\" not supported for remount\n", p);
1257                         return -EINVAL;
1258 #else
1259                         break;
1260 #endif
1261                 }
1262         }
1263 
1264         /* ro -> rw */
1265         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1266                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1267 
1268                 /*
1269                  * If this is the first remount to writeable state we
1270                  * might have some superblock changes to update.
1271                  */
1272                 if (mp->m_update_flags) {
1273                         error = xfs_mount_log_sb(mp, mp->m_update_flags);
1274                         if (error) {
1275                                 xfs_warn(mp, "failed to write sb changes");
1276                                 return error;
1277                         }
1278                         mp->m_update_flags = 0;
1279                 }
1280 
1281                 /*
1282                  * Fill out the reserve pool if it is empty. Use the stashed
1283                  * value if it is non-zero, otherwise go with the default.
1284                  */
1285                 xfs_restore_resvblks(mp);
1286                 xfs_log_work_queue(mp);
1287         }
1288 
1289         /* rw -> ro */
1290         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1291                 /*
1292                  * Before we sync the metadata, we need to free up the reserve
1293                  * block pool so that the used block count in the superblock on
1294                  * disk is correct at the end of the remount. Stash the current
1295                  * reserve pool size so that if we get remounted rw, we can
1296                  * return it to the same size.
1297                  */
1298                 xfs_save_resvblks(mp);
1299                 xfs_quiesce_attr(mp);
1300                 mp->m_flags |= XFS_MOUNT_RDONLY;
1301         }
1302 
1303         return 0;
1304 }
1305 
1306 /*
1307  * Second stage of a freeze. The data is already frozen so we only
1308  * need to take care of the metadata. Once that's done write a dummy
1309  * record to dirty the log in case of a crash while frozen.
1310  */
1311 STATIC int
1312 xfs_fs_freeze(
1313         struct super_block      *sb)
1314 {
1315         struct xfs_mount        *mp = XFS_M(sb);
1316 
1317         xfs_save_resvblks(mp);
1318         xfs_quiesce_attr(mp);
1319         return -xfs_fs_log_dummy(mp);
1320 }
1321 
1322 STATIC int
1323 xfs_fs_unfreeze(
1324         struct super_block      *sb)
1325 {
1326         struct xfs_mount        *mp = XFS_M(sb);
1327 
1328         xfs_restore_resvblks(mp);
1329         xfs_log_work_queue(mp);
1330         return 0;
1331 }
1332 
1333 STATIC int
1334 xfs_fs_show_options(
1335         struct seq_file         *m,
1336         struct dentry           *root)
1337 {
1338         return -xfs_showargs(XFS_M(root->d_sb), m);
1339 }
1340 
1341 /*
1342  * This function fills in xfs_mount_t fields based on mount args.
1343  * Note: the superblock _has_ now been read in.
1344  */
1345 STATIC int
1346 xfs_finish_flags(
1347         struct xfs_mount        *mp)
1348 {
1349         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1350 
1351         /* Fail a mount where the logbuf is smaller than the log stripe */
1352         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1353                 if (mp->m_logbsize <= 0 &&
1354                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1355                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1356                 } else if (mp->m_logbsize > 0 &&
1357                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1358                         xfs_warn(mp,
1359                 "logbuf size must be greater than or equal to log stripe size");
1360                         return XFS_ERROR(EINVAL);
1361                 }
1362         } else {
1363                 /* Fail a mount if the logbuf is larger than 32K */
1364                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1365                         xfs_warn(mp,
1366                 "logbuf size for version 1 logs must be 16K or 32K");
1367                         return XFS_ERROR(EINVAL);
1368                 }
1369         }
1370 
1371         /*
1372          * V5 filesystems always use attr2 format for attributes.
1373          */
1374         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1375             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1376                 xfs_warn(mp,
1377 "Cannot mount a V5 filesystem as %s. %s is always enabled for V5 filesystems.",
1378                         MNTOPT_NOATTR2, MNTOPT_ATTR2);
1379                 return XFS_ERROR(EINVAL);
1380         }
1381 
1382         /*
1383          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1384          * told by noattr2 to turn it off
1385          */
1386         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1387             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1388                 mp->m_flags |= XFS_MOUNT_ATTR2;
1389 
1390         /*
1391          * prohibit r/w mounts of read-only filesystems
1392          */
1393         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1394                 xfs_warn(mp,
1395                         "cannot mount a read-only filesystem as read-write");
1396                 return XFS_ERROR(EROFS);
1397         }
1398 
1399         return 0;
1400 }
1401 
1402 STATIC int
1403 xfs_fs_fill_super(
1404         struct super_block      *sb,
1405         void                    *data,
1406         int                     silent)
1407 {
1408         struct inode            *root;
1409         struct xfs_mount        *mp = NULL;
1410         int                     flags = 0, error = ENOMEM;
1411 
1412         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1413         if (!mp)
1414                 goto out;
1415 
1416         spin_lock_init(&mp->m_sb_lock);
1417         mutex_init(&mp->m_growlock);
1418         atomic_set(&mp->m_active_trans, 0);
1419         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1420         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1421 
1422         mp->m_super = sb;
1423         sb->s_fs_info = mp;
1424 
1425         error = xfs_parseargs(mp, (char *)data);
1426         if (error)
1427                 goto out_free_fsname;
1428 
1429         sb_min_blocksize(sb, BBSIZE);
1430         sb->s_xattr = xfs_xattr_handlers;
1431         sb->s_export_op = &xfs_export_operations;
1432 #ifdef CONFIG_XFS_QUOTA
1433         sb->s_qcop = &xfs_quotactl_operations;
1434 #endif
1435         sb->s_op = &xfs_super_operations;
1436 
1437         if (silent)
1438                 flags |= XFS_MFSI_QUIET;
1439 
1440         error = xfs_open_devices(mp);
1441         if (error)
1442                 goto out_free_fsname;
1443 
1444         error = xfs_init_mount_workqueues(mp);
1445         if (error)
1446                 goto out_close_devices;
1447 
1448         error = xfs_icsb_init_counters(mp);
1449         if (error)
1450                 goto out_destroy_workqueues;
1451 
1452         error = xfs_readsb(mp, flags);
1453         if (error)
1454                 goto out_destroy_counters;
1455 
1456         error = xfs_finish_flags(mp);
1457         if (error)
1458                 goto out_free_sb;
1459 
1460         error = xfs_setup_devices(mp);
1461         if (error)
1462                 goto out_free_sb;
1463 
1464         error = xfs_filestream_mount(mp);
1465         if (error)
1466                 goto out_free_sb;
1467 
1468         /*
1469          * we must configure the block size in the superblock before we run the
1470          * full mount process as the mount process can lookup and cache inodes.
1471          */
1472         sb->s_magic = XFS_SB_MAGIC;
1473         sb->s_blocksize = mp->m_sb.sb_blocksize;
1474         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1475         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1476         sb->s_max_links = XFS_MAXLINK;
1477         sb->s_time_gran = 1;
1478         set_posix_acl_flag(sb);
1479 
1480         /* version 5 superblocks support inode version counters. */
1481         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1482                 sb->s_flags |= MS_I_VERSION;
1483 
1484         error = xfs_mountfs(mp);
1485         if (error)
1486                 goto out_filestream_unmount;
1487 
1488         root = igrab(VFS_I(mp->m_rootip));
1489         if (!root) {
1490                 error = ENOENT;
1491                 goto out_unmount;
1492         }
1493         if (is_bad_inode(root)) {
1494                 error = EINVAL;
1495                 goto out_unmount;
1496         }
1497         sb->s_root = d_make_root(root);
1498         if (!sb->s_root) {
1499                 error = ENOMEM;
1500                 goto out_unmount;
1501         }
1502 
1503         return 0;
1504 
1505  out_filestream_unmount:
1506         xfs_filestream_unmount(mp);
1507  out_free_sb:
1508         xfs_freesb(mp);
1509  out_destroy_counters:
1510         xfs_icsb_destroy_counters(mp);
1511 out_destroy_workqueues:
1512         xfs_destroy_mount_workqueues(mp);
1513  out_close_devices:
1514         xfs_close_devices(mp);
1515  out_free_fsname:
1516         xfs_free_fsname(mp);
1517         kfree(mp);
1518  out:
1519         return -error;
1520 
1521  out_unmount:
1522         xfs_filestream_unmount(mp);
1523         xfs_unmountfs(mp);
1524         goto out_free_sb;
1525 }
1526 
1527 STATIC struct dentry *
1528 xfs_fs_mount(
1529         struct file_system_type *fs_type,
1530         int                     flags,
1531         const char              *dev_name,
1532         void                    *data)
1533 {
1534         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1535 }
1536 
1537 static int
1538 xfs_fs_nr_cached_objects(
1539         struct super_block      *sb)
1540 {
1541         return xfs_reclaim_inodes_count(XFS_M(sb));
1542 }
1543 
1544 static void
1545 xfs_fs_free_cached_objects(
1546         struct super_block      *sb,
1547         int                     nr_to_scan)
1548 {
1549         xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan);
1550 }
1551 
1552 static const struct super_operations xfs_super_operations = {
1553         .alloc_inode            = xfs_fs_alloc_inode,
1554         .destroy_inode          = xfs_fs_destroy_inode,
1555         .evict_inode            = xfs_fs_evict_inode,
1556         .drop_inode             = xfs_fs_drop_inode,
1557         .put_super              = xfs_fs_put_super,
1558         .sync_fs                = xfs_fs_sync_fs,
1559         .freeze_fs              = xfs_fs_freeze,
1560         .unfreeze_fs            = xfs_fs_unfreeze,
1561         .statfs                 = xfs_fs_statfs,
1562         .remount_fs             = xfs_fs_remount,
1563         .show_options           = xfs_fs_show_options,
1564         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1565         .free_cached_objects    = xfs_fs_free_cached_objects,
1566 };
1567 
1568 static struct file_system_type xfs_fs_type = {
1569         .owner                  = THIS_MODULE,
1570         .name                   = "xfs",
1571         .mount                  = xfs_fs_mount,
1572         .kill_sb                = kill_block_super,
1573         .fs_flags               = FS_REQUIRES_DEV,
1574 };
1575 MODULE_ALIAS_FS("xfs");
1576 
1577 STATIC int __init
1578 xfs_init_zones(void)
1579 {
1580 
1581         xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
1582         if (!xfs_ioend_zone)
1583                 goto out;
1584 
1585         xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
1586                                                   xfs_ioend_zone);
1587         if (!xfs_ioend_pool)
1588                 goto out_destroy_ioend_zone;
1589 
1590         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1591                                                 "xfs_log_ticket");
1592         if (!xfs_log_ticket_zone)
1593                 goto out_destroy_ioend_pool;
1594 
1595         xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
1596                                                 "xfs_bmap_free_item");
1597         if (!xfs_bmap_free_item_zone)
1598                 goto out_destroy_log_ticket_zone;
1599 
1600         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1601                                                 "xfs_btree_cur");
1602         if (!xfs_btree_cur_zone)
1603                 goto out_destroy_bmap_free_item_zone;
1604 
1605         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1606                                                 "xfs_da_state");
1607         if (!xfs_da_state_zone)
1608                 goto out_destroy_btree_cur_zone;
1609 
1610         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1611         if (!xfs_ifork_zone)
1612                 goto out_destroy_da_state_zone;
1613 
1614         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1615         if (!xfs_trans_zone)
1616                 goto out_destroy_ifork_zone;
1617 
1618         xfs_log_item_desc_zone =
1619                 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1620                                "xfs_log_item_desc");
1621         if (!xfs_log_item_desc_zone)
1622                 goto out_destroy_trans_zone;
1623 
1624         /*
1625          * The size of the zone allocated buf log item is the maximum
1626          * size possible under XFS.  This wastes a little bit of memory,
1627          * but it is much faster.
1628          */
1629         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1630                                            "xfs_buf_item");
1631         if (!xfs_buf_item_zone)
1632                 goto out_destroy_log_item_desc_zone;
1633 
1634         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1635                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1636                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1637         if (!xfs_efd_zone)
1638                 goto out_destroy_buf_item_zone;
1639 
1640         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1641                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1642                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1643         if (!xfs_efi_zone)
1644                 goto out_destroy_efd_zone;
1645 
1646         xfs_inode_zone =
1647                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1648                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD,
1649                         xfs_fs_inode_init_once);
1650         if (!xfs_inode_zone)
1651                 goto out_destroy_efi_zone;
1652 
1653         xfs_ili_zone =
1654                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1655                                         KM_ZONE_SPREAD, NULL);
1656         if (!xfs_ili_zone)
1657                 goto out_destroy_inode_zone;
1658         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1659                                         "xfs_icr");
1660         if (!xfs_icreate_zone)
1661                 goto out_destroy_ili_zone;
1662 
1663         return 0;
1664 
1665  out_destroy_ili_zone:
1666         kmem_zone_destroy(xfs_ili_zone);
1667  out_destroy_inode_zone:
1668         kmem_zone_destroy(xfs_inode_zone);
1669  out_destroy_efi_zone:
1670         kmem_zone_destroy(xfs_efi_zone);
1671  out_destroy_efd_zone:
1672         kmem_zone_destroy(xfs_efd_zone);
1673  out_destroy_buf_item_zone:
1674         kmem_zone_destroy(xfs_buf_item_zone);
1675  out_destroy_log_item_desc_zone:
1676         kmem_zone_destroy(xfs_log_item_desc_zone);
1677  out_destroy_trans_zone:
1678         kmem_zone_destroy(xfs_trans_zone);
1679  out_destroy_ifork_zone:
1680         kmem_zone_destroy(xfs_ifork_zone);
1681  out_destroy_da_state_zone:
1682         kmem_zone_destroy(xfs_da_state_zone);
1683  out_destroy_btree_cur_zone:
1684         kmem_zone_destroy(xfs_btree_cur_zone);
1685  out_destroy_bmap_free_item_zone:
1686         kmem_zone_destroy(xfs_bmap_free_item_zone);
1687  out_destroy_log_ticket_zone:
1688         kmem_zone_destroy(xfs_log_ticket_zone);
1689  out_destroy_ioend_pool:
1690         mempool_destroy(xfs_ioend_pool);
1691  out_destroy_ioend_zone:
1692         kmem_zone_destroy(xfs_ioend_zone);
1693  out:
1694         return -ENOMEM;
1695 }
1696 
1697 STATIC void
1698 xfs_destroy_zones(void)
1699 {
1700         /*
1701          * Make sure all delayed rcu free are flushed before we
1702          * destroy caches.
1703          */
1704         rcu_barrier();
1705         kmem_zone_destroy(xfs_icreate_zone);
1706         kmem_zone_destroy(xfs_ili_zone);
1707         kmem_zone_destroy(xfs_inode_zone);
1708         kmem_zone_destroy(xfs_efi_zone);
1709         kmem_zone_destroy(xfs_efd_zone);
1710         kmem_zone_destroy(xfs_buf_item_zone);
1711         kmem_zone_destroy(xfs_log_item_desc_zone);
1712         kmem_zone_destroy(xfs_trans_zone);
1713         kmem_zone_destroy(xfs_ifork_zone);
1714         kmem_zone_destroy(xfs_da_state_zone);
1715         kmem_zone_destroy(xfs_btree_cur_zone);
1716         kmem_zone_destroy(xfs_bmap_free_item_zone);
1717         kmem_zone_destroy(xfs_log_ticket_zone);
1718         mempool_destroy(xfs_ioend_pool);
1719         kmem_zone_destroy(xfs_ioend_zone);
1720 
1721 }
1722 
1723 STATIC int __init
1724 xfs_init_workqueues(void)
1725 {
1726         /*
1727          * The allocation workqueue can be used in memory reclaim situations
1728          * (writepage path), and parallelism is only limited by the number of
1729          * AGs in all the filesystems mounted. Hence use the default large
1730          * max_active value for this workqueue.
1731          */
1732         xfs_alloc_wq = alloc_workqueue("xfsalloc", WQ_MEM_RECLAIM, 0);
1733         if (!xfs_alloc_wq)
1734                 return -ENOMEM;
1735 
1736         return 0;
1737 }
1738 
1739 STATIC void
1740 xfs_destroy_workqueues(void)
1741 {
1742         destroy_workqueue(xfs_alloc_wq);
1743 }
1744 
1745 STATIC int __init
1746 init_xfs_fs(void)
1747 {
1748         int                     error;
1749 
1750         printk(KERN_INFO XFS_VERSION_STRING " with "
1751                          XFS_BUILD_OPTIONS " enabled\n");
1752 
1753         xfs_dir_startup();
1754 
1755         error = xfs_init_zones();
1756         if (error)
1757                 goto out;
1758 
1759         error = xfs_init_workqueues();
1760         if (error)
1761                 goto out_destroy_zones;
1762 
1763         error = xfs_mru_cache_init();
1764         if (error)
1765                 goto out_destroy_wq;
1766 
1767         error = xfs_filestream_init();
1768         if (error)
1769                 goto out_mru_cache_uninit;
1770 
1771         error = xfs_buf_init();
1772         if (error)
1773                 goto out_filestream_uninit;
1774 
1775         error = xfs_init_procfs();
1776         if (error)
1777                 goto out_buf_terminate;
1778 
1779         error = xfs_sysctl_register();
1780         if (error)
1781                 goto out_cleanup_procfs;
1782 
1783         error = xfs_qm_init();
1784         if (error)
1785                 goto out_sysctl_unregister;
1786 
1787         error = register_filesystem(&xfs_fs_type);
1788         if (error)
1789                 goto out_qm_exit;
1790         return 0;
1791 
1792  out_qm_exit:
1793         xfs_qm_exit();
1794  out_sysctl_unregister:
1795         xfs_sysctl_unregister();
1796  out_cleanup_procfs:
1797         xfs_cleanup_procfs();
1798  out_buf_terminate:
1799         xfs_buf_terminate();
1800  out_filestream_uninit:
1801         xfs_filestream_uninit();
1802  out_mru_cache_uninit:
1803         xfs_mru_cache_uninit();
1804  out_destroy_wq:
1805         xfs_destroy_workqueues();
1806  out_destroy_zones:
1807         xfs_destroy_zones();
1808  out:
1809         return error;
1810 }
1811 
1812 STATIC void __exit
1813 exit_xfs_fs(void)
1814 {
1815         xfs_qm_exit();
1816         unregister_filesystem(&xfs_fs_type);
1817         xfs_sysctl_unregister();
1818         xfs_cleanup_procfs();
1819         xfs_buf_terminate();
1820         xfs_filestream_uninit();
1821         xfs_mru_cache_uninit();
1822         xfs_destroy_workqueues();
1823         xfs_destroy_zones();
1824 }
1825 
1826 module_init(init_xfs_fs);
1827 module_exit(exit_xfs_fs);
1828 
1829 MODULE_AUTHOR("Silicon Graphics, Inc.");
1830 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
1831 MODULE_LICENSE("GPL");
1832 

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