Version:  2.0.40 2.2.26 2.4.37 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 3.18 3.19 4.0

Linux/fs/xfs/xfs_super.c

  1 /*
  2  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
  3  * All Rights Reserved.
  4  *
  5  * This program is free software; you can redistribute it and/or
  6  * modify it under the terms of the GNU General Public License as
  7  * published by the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it would be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, write the Free Software Foundation,
 16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 17  */
 18 
 19 #include "xfs.h"
 20 #include "xfs_shared.h"
 21 #include "xfs_format.h"
 22 #include "xfs_log_format.h"
 23 #include "xfs_trans_resv.h"
 24 #include "xfs_sb.h"
 25 #include "xfs_mount.h"
 26 #include "xfs_da_format.h"
 27 #include "xfs_inode.h"
 28 #include "xfs_btree.h"
 29 #include "xfs_bmap.h"
 30 #include "xfs_alloc.h"
 31 #include "xfs_error.h"
 32 #include "xfs_fsops.h"
 33 #include "xfs_trans.h"
 34 #include "xfs_buf_item.h"
 35 #include "xfs_log.h"
 36 #include "xfs_log_priv.h"
 37 #include "xfs_da_btree.h"
 38 #include "xfs_dir2.h"
 39 #include "xfs_extfree_item.h"
 40 #include "xfs_mru_cache.h"
 41 #include "xfs_inode_item.h"
 42 #include "xfs_icache.h"
 43 #include "xfs_trace.h"
 44 #include "xfs_icreate_item.h"
 45 #include "xfs_filestream.h"
 46 #include "xfs_quota.h"
 47 #include "xfs_sysfs.h"
 48 
 49 #include <linux/namei.h>
 50 #include <linux/init.h>
 51 #include <linux/slab.h>
 52 #include <linux/mount.h>
 53 #include <linux/mempool.h>
 54 #include <linux/writeback.h>
 55 #include <linux/kthread.h>
 56 #include <linux/freezer.h>
 57 #include <linux/parser.h>
 58 
 59 static const struct super_operations xfs_super_operations;
 60 static kmem_zone_t *xfs_ioend_zone;
 61 mempool_t *xfs_ioend_pool;
 62 
 63 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
 64 #ifdef DEBUG
 65 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
 66 #endif
 67 
 68 #define MNTOPT_LOGBUFS  "logbufs"       /* number of XFS log buffers */
 69 #define MNTOPT_LOGBSIZE "logbsize"      /* size of XFS log buffers */
 70 #define MNTOPT_LOGDEV   "logdev"        /* log device */
 71 #define MNTOPT_RTDEV    "rtdev"         /* realtime I/O device */
 72 #define MNTOPT_BIOSIZE  "biosize"       /* log2 of preferred buffered io size */
 73 #define MNTOPT_WSYNC    "wsync"         /* safe-mode nfs compatible mount */
 74 #define MNTOPT_NOALIGN  "noalign"       /* turn off stripe alignment */
 75 #define MNTOPT_SWALLOC  "swalloc"       /* turn on stripe width allocation */
 76 #define MNTOPT_SUNIT    "sunit"         /* data volume stripe unit */
 77 #define MNTOPT_SWIDTH   "swidth"        /* data volume stripe width */
 78 #define MNTOPT_NOUUID   "nouuid"        /* ignore filesystem UUID */
 79 #define MNTOPT_MTPT     "mtpt"          /* filesystem mount point */
 80 #define MNTOPT_GRPID    "grpid"         /* group-ID from parent directory */
 81 #define MNTOPT_NOGRPID  "nogrpid"       /* group-ID from current process */
 82 #define MNTOPT_BSDGROUPS    "bsdgroups"    /* group-ID from parent directory */
 83 #define MNTOPT_SYSVGROUPS   "sysvgroups"   /* group-ID from current process */
 84 #define MNTOPT_ALLOCSIZE    "allocsize"    /* preferred allocation size */
 85 #define MNTOPT_NORECOVERY   "norecovery"   /* don't run XFS recovery */
 86 #define MNTOPT_BARRIER  "barrier"       /* use writer barriers for log write and
 87                                          * unwritten extent conversion */
 88 #define MNTOPT_NOBARRIER "nobarrier"    /* .. disable */
 89 #define MNTOPT_64BITINODE   "inode64"   /* inodes can be allocated anywhere */
 90 #define MNTOPT_32BITINODE   "inode32"   /* inode allocation limited to
 91                                          * XFS_MAXINUMBER_32 */
 92 #define MNTOPT_IKEEP    "ikeep"         /* do not free empty inode clusters */
 93 #define MNTOPT_NOIKEEP  "noikeep"       /* free empty inode clusters */
 94 #define MNTOPT_LARGEIO     "largeio"    /* report large I/O sizes in stat() */
 95 #define MNTOPT_NOLARGEIO   "nolargeio"  /* do not report large I/O sizes
 96                                          * in stat(). */
 97 #define MNTOPT_ATTR2    "attr2"         /* do use attr2 attribute format */
 98 #define MNTOPT_NOATTR2  "noattr2"       /* do not use attr2 attribute format */
 99 #define MNTOPT_FILESTREAM  "filestreams" /* use filestreams allocator */
100 #define MNTOPT_QUOTA    "quota"         /* disk quotas (user) */
101 #define MNTOPT_NOQUOTA  "noquota"       /* no quotas */
102 #define MNTOPT_USRQUOTA "usrquota"      /* user quota enabled */
103 #define MNTOPT_GRPQUOTA "grpquota"      /* group quota enabled */
104 #define MNTOPT_PRJQUOTA "prjquota"      /* project quota enabled */
105 #define MNTOPT_UQUOTA   "uquota"        /* user quota (IRIX variant) */
106 #define MNTOPT_GQUOTA   "gquota"        /* group quota (IRIX variant) */
107 #define MNTOPT_PQUOTA   "pquota"        /* project quota (IRIX variant) */
108 #define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */
109 #define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */
110 #define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */
111 #define MNTOPT_QUOTANOENF  "qnoenforce" /* same as uqnoenforce */
112 #define MNTOPT_DELAYLOG    "delaylog"   /* Delayed logging enabled */
113 #define MNTOPT_NODELAYLOG  "nodelaylog" /* Delayed logging disabled */
114 #define MNTOPT_DISCARD     "discard"    /* Discard unused blocks */
115 #define MNTOPT_NODISCARD   "nodiscard"  /* Do not discard unused blocks */
116 
117 /*
118  * Table driven mount option parser.
119  *
120  * Currently only used for remount, but it will be used for mount
121  * in the future, too.
122  */
123 enum {
124         Opt_barrier,
125         Opt_nobarrier,
126         Opt_inode64,
127         Opt_inode32,
128         Opt_err
129 };
130 
131 static const match_table_t tokens = {
132         {Opt_barrier, "barrier"},
133         {Opt_nobarrier, "nobarrier"},
134         {Opt_inode64, "inode64"},
135         {Opt_inode32, "inode32"},
136         {Opt_err, NULL}
137 };
138 
139 
140 STATIC unsigned long
141 suffix_kstrtoint(char *s, unsigned int base, int *res)
142 {
143         int     last, shift_left_factor = 0, _res;
144         char    *value = s;
145 
146         last = strlen(value) - 1;
147         if (value[last] == 'K' || value[last] == 'k') {
148                 shift_left_factor = 10;
149                 value[last] = '\0';
150         }
151         if (value[last] == 'M' || value[last] == 'm') {
152                 shift_left_factor = 20;
153                 value[last] = '\0';
154         }
155         if (value[last] == 'G' || value[last] == 'g') {
156                 shift_left_factor = 30;
157                 value[last] = '\0';
158         }
159 
160         if (kstrtoint(s, base, &_res))
161                 return -EINVAL;
162         *res = _res << shift_left_factor;
163         return 0;
164 }
165 
166 /*
167  * This function fills in xfs_mount_t fields based on mount args.
168  * Note: the superblock has _not_ yet been read in.
169  *
170  * Note that this function leaks the various device name allocations on
171  * failure.  The caller takes care of them.
172  */
173 STATIC int
174 xfs_parseargs(
175         struct xfs_mount        *mp,
176         char                    *options)
177 {
178         struct super_block      *sb = mp->m_super;
179         char                    *this_char, *value;
180         int                     dsunit = 0;
181         int                     dswidth = 0;
182         int                     iosize = 0;
183         __uint8_t               iosizelog = 0;
184 
185         /*
186          * set up the mount name first so all the errors will refer to the
187          * correct device.
188          */
189         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
190         if (!mp->m_fsname)
191                 return -ENOMEM;
192         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
193 
194         /*
195          * Copy binary VFS mount flags we are interested in.
196          */
197         if (sb->s_flags & MS_RDONLY)
198                 mp->m_flags |= XFS_MOUNT_RDONLY;
199         if (sb->s_flags & MS_DIRSYNC)
200                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
201         if (sb->s_flags & MS_SYNCHRONOUS)
202                 mp->m_flags |= XFS_MOUNT_WSYNC;
203 
204         /*
205          * Set some default flags that could be cleared by the mount option
206          * parsing.
207          */
208         mp->m_flags |= XFS_MOUNT_BARRIER;
209         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
210 
211         /*
212          * These can be overridden by the mount option parsing.
213          */
214         mp->m_logbufs = -1;
215         mp->m_logbsize = -1;
216 
217         if (!options)
218                 goto done;
219 
220         while ((this_char = strsep(&options, ",")) != NULL) {
221                 if (!*this_char)
222                         continue;
223                 if ((value = strchr(this_char, '=')) != NULL)
224                         *value++ = 0;
225 
226                 if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
227                         if (!value || !*value) {
228                                 xfs_warn(mp, "%s option requires an argument",
229                                         this_char);
230                                 return -EINVAL;
231                         }
232                         if (kstrtoint(value, 10, &mp->m_logbufs))
233                                 return -EINVAL;
234                 } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
235                         if (!value || !*value) {
236                                 xfs_warn(mp, "%s option requires an argument",
237                                         this_char);
238                                 return -EINVAL;
239                         }
240                         if (suffix_kstrtoint(value, 10, &mp->m_logbsize))
241                                 return -EINVAL;
242                 } else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
243                         if (!value || !*value) {
244                                 xfs_warn(mp, "%s option requires an argument",
245                                         this_char);
246                                 return -EINVAL;
247                         }
248                         mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
249                         if (!mp->m_logname)
250                                 return -ENOMEM;
251                 } else if (!strcmp(this_char, MNTOPT_MTPT)) {
252                         xfs_warn(mp, "%s option not allowed on this system",
253                                 this_char);
254                         return -EINVAL;
255                 } else if (!strcmp(this_char, MNTOPT_RTDEV)) {
256                         if (!value || !*value) {
257                                 xfs_warn(mp, "%s option requires an argument",
258                                         this_char);
259                                 return -EINVAL;
260                         }
261                         mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
262                         if (!mp->m_rtname)
263                                 return -ENOMEM;
264                 } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
265                         if (!value || !*value) {
266                                 xfs_warn(mp, "%s option requires an argument",
267                                         this_char);
268                                 return -EINVAL;
269                         }
270                         if (kstrtoint(value, 10, &iosize))
271                                 return -EINVAL;
272                         iosizelog = ffs(iosize) - 1;
273                 } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
274                         if (!value || !*value) {
275                                 xfs_warn(mp, "%s option requires an argument",
276                                         this_char);
277                                 return -EINVAL;
278                         }
279                         if (suffix_kstrtoint(value, 10, &iosize))
280                                 return -EINVAL;
281                         iosizelog = ffs(iosize) - 1;
282                 } else if (!strcmp(this_char, MNTOPT_GRPID) ||
283                            !strcmp(this_char, MNTOPT_BSDGROUPS)) {
284                         mp->m_flags |= XFS_MOUNT_GRPID;
285                 } else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
286                            !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
287                         mp->m_flags &= ~XFS_MOUNT_GRPID;
288                 } else if (!strcmp(this_char, MNTOPT_WSYNC)) {
289                         mp->m_flags |= XFS_MOUNT_WSYNC;
290                 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
291                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
292                 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
293                         mp->m_flags |= XFS_MOUNT_NOALIGN;
294                 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
295                         mp->m_flags |= XFS_MOUNT_SWALLOC;
296                 } else if (!strcmp(this_char, MNTOPT_SUNIT)) {
297                         if (!value || !*value) {
298                                 xfs_warn(mp, "%s option requires an argument",
299                                         this_char);
300                                 return -EINVAL;
301                         }
302                         if (kstrtoint(value, 10, &dsunit))
303                                 return -EINVAL;
304                 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
305                         if (!value || !*value) {
306                                 xfs_warn(mp, "%s option requires an argument",
307                                         this_char);
308                                 return -EINVAL;
309                         }
310                         if (kstrtoint(value, 10, &dswidth))
311                                 return -EINVAL;
312                 } else if (!strcmp(this_char, MNTOPT_32BITINODE)) {
313                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
314                 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
315                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
316                 } else if (!strcmp(this_char, MNTOPT_NOUUID)) {
317                         mp->m_flags |= XFS_MOUNT_NOUUID;
318                 } else if (!strcmp(this_char, MNTOPT_BARRIER)) {
319                         mp->m_flags |= XFS_MOUNT_BARRIER;
320                 } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
321                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
322                 } else if (!strcmp(this_char, MNTOPT_IKEEP)) {
323                         mp->m_flags |= XFS_MOUNT_IKEEP;
324                 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
325                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
326                 } else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
327                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
328                 } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
329                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
330                 } else if (!strcmp(this_char, MNTOPT_ATTR2)) {
331                         mp->m_flags |= XFS_MOUNT_ATTR2;
332                 } else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
333                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
334                         mp->m_flags |= XFS_MOUNT_NOATTR2;
335                 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
336                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
337                 } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
338                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
339                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
340                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
341                 } else if (!strcmp(this_char, MNTOPT_QUOTA) ||
342                            !strcmp(this_char, MNTOPT_UQUOTA) ||
343                            !strcmp(this_char, MNTOPT_USRQUOTA)) {
344                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
345                                          XFS_UQUOTA_ENFD);
346                 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
347                            !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
348                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
349                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
350                 } else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
351                            !strcmp(this_char, MNTOPT_PRJQUOTA)) {
352                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
353                                          XFS_PQUOTA_ENFD);
354                 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
355                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
356                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
357                 } else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
358                            !strcmp(this_char, MNTOPT_GRPQUOTA)) {
359                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
360                                          XFS_GQUOTA_ENFD);
361                 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
362                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
363                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
364                 } else if (!strcmp(this_char, MNTOPT_DELAYLOG)) {
365                         xfs_warn(mp,
366         "delaylog is the default now, option is deprecated.");
367                 } else if (!strcmp(this_char, MNTOPT_NODELAYLOG)) {
368                         xfs_warn(mp,
369         "nodelaylog support has been removed, option is deprecated.");
370                 } else if (!strcmp(this_char, MNTOPT_DISCARD)) {
371                         mp->m_flags |= XFS_MOUNT_DISCARD;
372                 } else if (!strcmp(this_char, MNTOPT_NODISCARD)) {
373                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
374                 } else if (!strcmp(this_char, "ihashsize")) {
375                         xfs_warn(mp,
376         "ihashsize no longer used, option is deprecated.");
377                 } else if (!strcmp(this_char, "osyncisdsync")) {
378                         xfs_warn(mp,
379         "osyncisdsync has no effect, option is deprecated.");
380                 } else if (!strcmp(this_char, "osyncisosync")) {
381                         xfs_warn(mp,
382         "osyncisosync has no effect, option is deprecated.");
383                 } else if (!strcmp(this_char, "irixsgid")) {
384                         xfs_warn(mp,
385         "irixsgid is now a sysctl(2) variable, option is deprecated.");
386                 } else {
387                         xfs_warn(mp, "unknown mount option [%s].", this_char);
388                         return -EINVAL;
389                 }
390         }
391 
392         /*
393          * no recovery flag requires a read-only mount
394          */
395         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
396             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
397                 xfs_warn(mp, "no-recovery mounts must be read-only.");
398                 return -EINVAL;
399         }
400 
401         if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
402                 xfs_warn(mp,
403         "sunit and swidth options incompatible with the noalign option");
404                 return -EINVAL;
405         }
406 
407 #ifndef CONFIG_XFS_QUOTA
408         if (XFS_IS_QUOTA_RUNNING(mp)) {
409                 xfs_warn(mp, "quota support not available in this kernel.");
410                 return -EINVAL;
411         }
412 #endif
413 
414         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
415                 xfs_warn(mp, "sunit and swidth must be specified together");
416                 return -EINVAL;
417         }
418 
419         if (dsunit && (dswidth % dsunit != 0)) {
420                 xfs_warn(mp,
421         "stripe width (%d) must be a multiple of the stripe unit (%d)",
422                         dswidth, dsunit);
423                 return -EINVAL;
424         }
425 
426 done:
427         if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
428                 /*
429                  * At this point the superblock has not been read
430                  * in, therefore we do not know the block size.
431                  * Before the mount call ends we will convert
432                  * these to FSBs.
433                  */
434                 mp->m_dalign = dsunit;
435                 mp->m_swidth = dswidth;
436         }
437 
438         if (mp->m_logbufs != -1 &&
439             mp->m_logbufs != 0 &&
440             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
441              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
442                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
443                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
444                 return -EINVAL;
445         }
446         if (mp->m_logbsize != -1 &&
447             mp->m_logbsize !=  0 &&
448             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
449              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
450              !is_power_of_2(mp->m_logbsize))) {
451                 xfs_warn(mp,
452                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
453                         mp->m_logbsize);
454                 return -EINVAL;
455         }
456 
457         if (iosizelog) {
458                 if (iosizelog > XFS_MAX_IO_LOG ||
459                     iosizelog < XFS_MIN_IO_LOG) {
460                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
461                                 iosizelog, XFS_MIN_IO_LOG,
462                                 XFS_MAX_IO_LOG);
463                         return -EINVAL;
464                 }
465 
466                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
467                 mp->m_readio_log = iosizelog;
468                 mp->m_writeio_log = iosizelog;
469         }
470 
471         return 0;
472 }
473 
474 struct proc_xfs_info {
475         int     flag;
476         char    *str;
477 };
478 
479 STATIC int
480 xfs_showargs(
481         struct xfs_mount        *mp,
482         struct seq_file         *m)
483 {
484         static struct proc_xfs_info xfs_info_set[] = {
485                 /* the few simple ones we can get from the mount struct */
486                 { XFS_MOUNT_IKEEP,              "," MNTOPT_IKEEP },
487                 { XFS_MOUNT_WSYNC,              "," MNTOPT_WSYNC },
488                 { XFS_MOUNT_NOALIGN,            "," MNTOPT_NOALIGN },
489                 { XFS_MOUNT_SWALLOC,            "," MNTOPT_SWALLOC },
490                 { XFS_MOUNT_NOUUID,             "," MNTOPT_NOUUID },
491                 { XFS_MOUNT_NORECOVERY,         "," MNTOPT_NORECOVERY },
492                 { XFS_MOUNT_ATTR2,              "," MNTOPT_ATTR2 },
493                 { XFS_MOUNT_FILESTREAMS,        "," MNTOPT_FILESTREAM },
494                 { XFS_MOUNT_GRPID,              "," MNTOPT_GRPID },
495                 { XFS_MOUNT_DISCARD,            "," MNTOPT_DISCARD },
496                 { XFS_MOUNT_SMALL_INUMS,        "," MNTOPT_32BITINODE },
497                 { 0, NULL }
498         };
499         static struct proc_xfs_info xfs_info_unset[] = {
500                 /* the few simple ones we can get from the mount struct */
501                 { XFS_MOUNT_COMPAT_IOSIZE,      "," MNTOPT_LARGEIO },
502                 { XFS_MOUNT_BARRIER,            "," MNTOPT_NOBARRIER },
503                 { XFS_MOUNT_SMALL_INUMS,        "," MNTOPT_64BITINODE },
504                 { 0, NULL }
505         };
506         struct proc_xfs_info    *xfs_infop;
507 
508         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
509                 if (mp->m_flags & xfs_infop->flag)
510                         seq_puts(m, xfs_infop->str);
511         }
512         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
513                 if (!(mp->m_flags & xfs_infop->flag))
514                         seq_puts(m, xfs_infop->str);
515         }
516 
517         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
518                 seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk",
519                                 (int)(1 << mp->m_writeio_log) >> 10);
520 
521         if (mp->m_logbufs > 0)
522                 seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
523         if (mp->m_logbsize > 0)
524                 seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10);
525 
526         if (mp->m_logname)
527                 seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname);
528         if (mp->m_rtname)
529                 seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname);
530 
531         if (mp->m_dalign > 0)
532                 seq_printf(m, "," MNTOPT_SUNIT "=%d",
533                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
534         if (mp->m_swidth > 0)
535                 seq_printf(m, "," MNTOPT_SWIDTH "=%d",
536                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
537 
538         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
539                 seq_puts(m, "," MNTOPT_USRQUOTA);
540         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
541                 seq_puts(m, "," MNTOPT_UQUOTANOENF);
542 
543         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
544                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
545                         seq_puts(m, "," MNTOPT_PRJQUOTA);
546                 else
547                         seq_puts(m, "," MNTOPT_PQUOTANOENF);
548         }
549         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
550                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
551                         seq_puts(m, "," MNTOPT_GRPQUOTA);
552                 else
553                         seq_puts(m, "," MNTOPT_GQUOTANOENF);
554         }
555 
556         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
557                 seq_puts(m, "," MNTOPT_NOQUOTA);
558 
559         return 0;
560 }
561 __uint64_t
562 xfs_max_file_offset(
563         unsigned int            blockshift)
564 {
565         unsigned int            pagefactor = 1;
566         unsigned int            bitshift = BITS_PER_LONG - 1;
567 
568         /* Figure out maximum filesize, on Linux this can depend on
569          * the filesystem blocksize (on 32 bit platforms).
570          * __block_write_begin does this in an [unsigned] long...
571          *      page->index << (PAGE_CACHE_SHIFT - bbits)
572          * So, for page sized blocks (4K on 32 bit platforms),
573          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
574          *      (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
575          * but for smaller blocksizes it is less (bbits = log2 bsize).
576          * Note1: get_block_t takes a long (implicit cast from above)
577          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
578          * can optionally convert the [unsigned] long from above into
579          * an [unsigned] long long.
580          */
581 
582 #if BITS_PER_LONG == 32
583 # if defined(CONFIG_LBDAF)
584         ASSERT(sizeof(sector_t) == 8);
585         pagefactor = PAGE_CACHE_SIZE;
586         bitshift = BITS_PER_LONG;
587 # else
588         pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
589 # endif
590 #endif
591 
592         return (((__uint64_t)pagefactor) << bitshift) - 1;
593 }
594 
595 /*
596  * xfs_set_inode32() and xfs_set_inode64() are passed an agcount
597  * because in the growfs case, mp->m_sb.sb_agcount is not updated
598  * yet to the potentially higher ag count.
599  */
600 xfs_agnumber_t
601 xfs_set_inode32(struct xfs_mount *mp, xfs_agnumber_t agcount)
602 {
603         xfs_agnumber_t  index = 0;
604         xfs_agnumber_t  maxagi = 0;
605         xfs_sb_t        *sbp = &mp->m_sb;
606         xfs_agnumber_t  max_metadata;
607         xfs_agino_t     agino;
608         xfs_ino_t       ino;
609         xfs_perag_t     *pag;
610 
611         /* Calculate how much should be reserved for inodes to meet
612          * the max inode percentage.
613          */
614         if (mp->m_maxicount) {
615                 __uint64_t      icount;
616 
617                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
618                 do_div(icount, 100);
619                 icount += sbp->sb_agblocks - 1;
620                 do_div(icount, sbp->sb_agblocks);
621                 max_metadata = icount;
622         } else {
623                 max_metadata = agcount;
624         }
625 
626         agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
627 
628         for (index = 0; index < agcount; index++) {
629                 ino = XFS_AGINO_TO_INO(mp, index, agino);
630 
631                 if (ino > XFS_MAXINUMBER_32) {
632                         pag = xfs_perag_get(mp, index);
633                         pag->pagi_inodeok = 0;
634                         pag->pagf_metadata = 0;
635                         xfs_perag_put(pag);
636                         continue;
637                 }
638 
639                 pag = xfs_perag_get(mp, index);
640                 pag->pagi_inodeok = 1;
641                 maxagi++;
642                 if (index < max_metadata)
643                         pag->pagf_metadata = 1;
644                 xfs_perag_put(pag);
645         }
646         mp->m_flags |= (XFS_MOUNT_32BITINODES |
647                         XFS_MOUNT_SMALL_INUMS);
648 
649         return maxagi;
650 }
651 
652 xfs_agnumber_t
653 xfs_set_inode64(struct xfs_mount *mp, xfs_agnumber_t agcount)
654 {
655         xfs_agnumber_t index = 0;
656 
657         for (index = 0; index < agcount; index++) {
658                 struct xfs_perag        *pag;
659 
660                 pag = xfs_perag_get(mp, index);
661                 pag->pagi_inodeok = 1;
662                 pag->pagf_metadata = 0;
663                 xfs_perag_put(pag);
664         }
665 
666         /* There is no need for lock protection on m_flags,
667          * the rw_semaphore of the VFS superblock is locked
668          * during mount/umount/remount operations, so this is
669          * enough to avoid concurency on the m_flags field
670          */
671         mp->m_flags &= ~(XFS_MOUNT_32BITINODES |
672                          XFS_MOUNT_SMALL_INUMS);
673         return index;
674 }
675 
676 STATIC int
677 xfs_blkdev_get(
678         xfs_mount_t             *mp,
679         const char              *name,
680         struct block_device     **bdevp)
681 {
682         int                     error = 0;
683 
684         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
685                                     mp);
686         if (IS_ERR(*bdevp)) {
687                 error = PTR_ERR(*bdevp);
688                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
689         }
690 
691         return error;
692 }
693 
694 STATIC void
695 xfs_blkdev_put(
696         struct block_device     *bdev)
697 {
698         if (bdev)
699                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
700 }
701 
702 void
703 xfs_blkdev_issue_flush(
704         xfs_buftarg_t           *buftarg)
705 {
706         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
707 }
708 
709 STATIC void
710 xfs_close_devices(
711         struct xfs_mount        *mp)
712 {
713         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
714                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
715                 xfs_free_buftarg(mp, mp->m_logdev_targp);
716                 xfs_blkdev_put(logdev);
717         }
718         if (mp->m_rtdev_targp) {
719                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
720                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
721                 xfs_blkdev_put(rtdev);
722         }
723         xfs_free_buftarg(mp, mp->m_ddev_targp);
724 }
725 
726 /*
727  * The file system configurations are:
728  *      (1) device (partition) with data and internal log
729  *      (2) logical volume with data and log subvolumes.
730  *      (3) logical volume with data, log, and realtime subvolumes.
731  *
732  * We only have to handle opening the log and realtime volumes here if
733  * they are present.  The data subvolume has already been opened by
734  * get_sb_bdev() and is stored in sb->s_bdev.
735  */
736 STATIC int
737 xfs_open_devices(
738         struct xfs_mount        *mp)
739 {
740         struct block_device     *ddev = mp->m_super->s_bdev;
741         struct block_device     *logdev = NULL, *rtdev = NULL;
742         int                     error;
743 
744         /*
745          * Open real time and log devices - order is important.
746          */
747         if (mp->m_logname) {
748                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
749                 if (error)
750                         goto out;
751         }
752 
753         if (mp->m_rtname) {
754                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
755                 if (error)
756                         goto out_close_logdev;
757 
758                 if (rtdev == ddev || rtdev == logdev) {
759                         xfs_warn(mp,
760         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
761                         error = -EINVAL;
762                         goto out_close_rtdev;
763                 }
764         }
765 
766         /*
767          * Setup xfs_mount buffer target pointers
768          */
769         error = -ENOMEM;
770         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev);
771         if (!mp->m_ddev_targp)
772                 goto out_close_rtdev;
773 
774         if (rtdev) {
775                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev);
776                 if (!mp->m_rtdev_targp)
777                         goto out_free_ddev_targ;
778         }
779 
780         if (logdev && logdev != ddev) {
781                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
782                 if (!mp->m_logdev_targp)
783                         goto out_free_rtdev_targ;
784         } else {
785                 mp->m_logdev_targp = mp->m_ddev_targp;
786         }
787 
788         return 0;
789 
790  out_free_rtdev_targ:
791         if (mp->m_rtdev_targp)
792                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
793  out_free_ddev_targ:
794         xfs_free_buftarg(mp, mp->m_ddev_targp);
795  out_close_rtdev:
796         xfs_blkdev_put(rtdev);
797  out_close_logdev:
798         if (logdev && logdev != ddev)
799                 xfs_blkdev_put(logdev);
800  out:
801         return error;
802 }
803 
804 /*
805  * Setup xfs_mount buffer target pointers based on superblock
806  */
807 STATIC int
808 xfs_setup_devices(
809         struct xfs_mount        *mp)
810 {
811         int                     error;
812 
813         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
814         if (error)
815                 return error;
816 
817         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
818                 unsigned int    log_sector_size = BBSIZE;
819 
820                 if (xfs_sb_version_hassector(&mp->m_sb))
821                         log_sector_size = mp->m_sb.sb_logsectsize;
822                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
823                                             log_sector_size);
824                 if (error)
825                         return error;
826         }
827         if (mp->m_rtdev_targp) {
828                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
829                                             mp->m_sb.sb_sectsize);
830                 if (error)
831                         return error;
832         }
833 
834         return 0;
835 }
836 
837 STATIC int
838 xfs_init_mount_workqueues(
839         struct xfs_mount        *mp)
840 {
841         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
842                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
843         if (!mp->m_buf_workqueue)
844                 goto out;
845 
846         mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
847                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
848         if (!mp->m_data_workqueue)
849                 goto out_destroy_buf;
850 
851         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
852                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
853         if (!mp->m_unwritten_workqueue)
854                 goto out_destroy_data_iodone_queue;
855 
856         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
857                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
858         if (!mp->m_cil_workqueue)
859                 goto out_destroy_unwritten;
860 
861         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
862                         WQ_FREEZABLE, 0, mp->m_fsname);
863         if (!mp->m_reclaim_workqueue)
864                 goto out_destroy_cil;
865 
866         mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
867                         WQ_FREEZABLE|WQ_HIGHPRI, 0, mp->m_fsname);
868         if (!mp->m_log_workqueue)
869                 goto out_destroy_reclaim;
870 
871         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
872                         WQ_FREEZABLE, 0, mp->m_fsname);
873         if (!mp->m_eofblocks_workqueue)
874                 goto out_destroy_log;
875 
876         return 0;
877 
878 out_destroy_log:
879         destroy_workqueue(mp->m_log_workqueue);
880 out_destroy_reclaim:
881         destroy_workqueue(mp->m_reclaim_workqueue);
882 out_destroy_cil:
883         destroy_workqueue(mp->m_cil_workqueue);
884 out_destroy_unwritten:
885         destroy_workqueue(mp->m_unwritten_workqueue);
886 out_destroy_data_iodone_queue:
887         destroy_workqueue(mp->m_data_workqueue);
888 out_destroy_buf:
889         destroy_workqueue(mp->m_buf_workqueue);
890 out:
891         return -ENOMEM;
892 }
893 
894 STATIC void
895 xfs_destroy_mount_workqueues(
896         struct xfs_mount        *mp)
897 {
898         destroy_workqueue(mp->m_eofblocks_workqueue);
899         destroy_workqueue(mp->m_log_workqueue);
900         destroy_workqueue(mp->m_reclaim_workqueue);
901         destroy_workqueue(mp->m_cil_workqueue);
902         destroy_workqueue(mp->m_data_workqueue);
903         destroy_workqueue(mp->m_unwritten_workqueue);
904         destroy_workqueue(mp->m_buf_workqueue);
905 }
906 
907 /*
908  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
909  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
910  * for IO to complete so that we effectively throttle multiple callers to the
911  * rate at which IO is completing.
912  */
913 void
914 xfs_flush_inodes(
915         struct xfs_mount        *mp)
916 {
917         struct super_block      *sb = mp->m_super;
918 
919         if (down_read_trylock(&sb->s_umount)) {
920                 sync_inodes_sb(sb);
921                 up_read(&sb->s_umount);
922         }
923 }
924 
925 /* Catch misguided souls that try to use this interface on XFS */
926 STATIC struct inode *
927 xfs_fs_alloc_inode(
928         struct super_block      *sb)
929 {
930         BUG();
931         return NULL;
932 }
933 
934 /*
935  * Now that the generic code is guaranteed not to be accessing
936  * the linux inode, we can reclaim the inode.
937  */
938 STATIC void
939 xfs_fs_destroy_inode(
940         struct inode            *inode)
941 {
942         struct xfs_inode        *ip = XFS_I(inode);
943 
944         trace_xfs_destroy_inode(ip);
945 
946         XFS_STATS_INC(vn_reclaim);
947 
948         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
949 
950         /*
951          * We should never get here with one of the reclaim flags already set.
952          */
953         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
954         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
955 
956         /*
957          * We always use background reclaim here because even if the
958          * inode is clean, it still may be under IO and hence we have
959          * to take the flush lock. The background reclaim path handles
960          * this more efficiently than we can here, so simply let background
961          * reclaim tear down all inodes.
962          */
963         xfs_inode_set_reclaim_tag(ip);
964 }
965 
966 /*
967  * Slab object creation initialisation for the XFS inode.
968  * This covers only the idempotent fields in the XFS inode;
969  * all other fields need to be initialised on allocation
970  * from the slab. This avoids the need to repeatedly initialise
971  * fields in the xfs inode that left in the initialise state
972  * when freeing the inode.
973  */
974 STATIC void
975 xfs_fs_inode_init_once(
976         void                    *inode)
977 {
978         struct xfs_inode        *ip = inode;
979 
980         memset(ip, 0, sizeof(struct xfs_inode));
981 
982         /* vfs inode */
983         inode_init_once(VFS_I(ip));
984 
985         /* xfs inode */
986         atomic_set(&ip->i_pincount, 0);
987         spin_lock_init(&ip->i_flags_lock);
988 
989         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
990                      "xfsino", ip->i_ino);
991 }
992 
993 STATIC void
994 xfs_fs_evict_inode(
995         struct inode            *inode)
996 {
997         xfs_inode_t             *ip = XFS_I(inode);
998 
999         ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
1000 
1001         trace_xfs_evict_inode(ip);
1002 
1003         truncate_inode_pages_final(&inode->i_data);
1004         clear_inode(inode);
1005         XFS_STATS_INC(vn_rele);
1006         XFS_STATS_INC(vn_remove);
1007 
1008         xfs_inactive(ip);
1009 }
1010 
1011 /*
1012  * We do an unlocked check for XFS_IDONTCACHE here because we are already
1013  * serialised against cache hits here via the inode->i_lock and igrab() in
1014  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
1015  * racing with us, and it avoids needing to grab a spinlock here for every inode
1016  * we drop the final reference on.
1017  */
1018 STATIC int
1019 xfs_fs_drop_inode(
1020         struct inode            *inode)
1021 {
1022         struct xfs_inode        *ip = XFS_I(inode);
1023 
1024         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1025 }
1026 
1027 STATIC void
1028 xfs_free_fsname(
1029         struct xfs_mount        *mp)
1030 {
1031         kfree(mp->m_fsname);
1032         kfree(mp->m_rtname);
1033         kfree(mp->m_logname);
1034 }
1035 
1036 STATIC void
1037 xfs_fs_put_super(
1038         struct super_block      *sb)
1039 {
1040         struct xfs_mount        *mp = XFS_M(sb);
1041 
1042         xfs_filestream_unmount(mp);
1043         xfs_unmountfs(mp);
1044 
1045         xfs_freesb(mp);
1046         xfs_icsb_destroy_counters(mp);
1047         xfs_destroy_mount_workqueues(mp);
1048         xfs_close_devices(mp);
1049         xfs_free_fsname(mp);
1050         kfree(mp);
1051 }
1052 
1053 STATIC int
1054 xfs_fs_sync_fs(
1055         struct super_block      *sb,
1056         int                     wait)
1057 {
1058         struct xfs_mount        *mp = XFS_M(sb);
1059 
1060         /*
1061          * Doing anything during the async pass would be counterproductive.
1062          */
1063         if (!wait)
1064                 return 0;
1065 
1066         xfs_log_force(mp, XFS_LOG_SYNC);
1067         if (laptop_mode) {
1068                 /*
1069                  * The disk must be active because we're syncing.
1070                  * We schedule log work now (now that the disk is
1071                  * active) instead of later (when it might not be).
1072                  */
1073                 flush_delayed_work(&mp->m_log->l_work);
1074         }
1075 
1076         return 0;
1077 }
1078 
1079 STATIC int
1080 xfs_fs_statfs(
1081         struct dentry           *dentry,
1082         struct kstatfs          *statp)
1083 {
1084         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1085         xfs_sb_t                *sbp = &mp->m_sb;
1086         struct xfs_inode        *ip = XFS_I(dentry->d_inode);
1087         __uint64_t              fakeinos, id;
1088         xfs_extlen_t            lsize;
1089         __int64_t               ffree;
1090 
1091         statp->f_type = XFS_SB_MAGIC;
1092         statp->f_namelen = MAXNAMELEN - 1;
1093 
1094         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1095         statp->f_fsid.val[0] = (u32)id;
1096         statp->f_fsid.val[1] = (u32)(id >> 32);
1097 
1098         xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
1099 
1100         spin_lock(&mp->m_sb_lock);
1101         statp->f_bsize = sbp->sb_blocksize;
1102         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1103         statp->f_blocks = sbp->sb_dblocks - lsize;
1104         statp->f_bfree = statp->f_bavail =
1105                                 sbp->sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1106         fakeinos = statp->f_bfree << sbp->sb_inopblog;
1107         statp->f_files =
1108             MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1109         if (mp->m_maxicount)
1110                 statp->f_files = min_t(typeof(statp->f_files),
1111                                         statp->f_files,
1112                                         mp->m_maxicount);
1113 
1114         /* If sb_icount overshot maxicount, report actual allocation */
1115         statp->f_files = max_t(typeof(statp->f_files),
1116                                         statp->f_files,
1117                                         sbp->sb_icount);
1118 
1119         /* make sure statp->f_ffree does not underflow */
1120         ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
1121         statp->f_ffree = max_t(__int64_t, ffree, 0);
1122 
1123         spin_unlock(&mp->m_sb_lock);
1124 
1125         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1126             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1127                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1128                 xfs_qm_statvfs(ip, statp);
1129         return 0;
1130 }
1131 
1132 STATIC void
1133 xfs_save_resvblks(struct xfs_mount *mp)
1134 {
1135         __uint64_t resblks = 0;
1136 
1137         mp->m_resblks_save = mp->m_resblks;
1138         xfs_reserve_blocks(mp, &resblks, NULL);
1139 }
1140 
1141 STATIC void
1142 xfs_restore_resvblks(struct xfs_mount *mp)
1143 {
1144         __uint64_t resblks;
1145 
1146         if (mp->m_resblks_save) {
1147                 resblks = mp->m_resblks_save;
1148                 mp->m_resblks_save = 0;
1149         } else
1150                 resblks = xfs_default_resblks(mp);
1151 
1152         xfs_reserve_blocks(mp, &resblks, NULL);
1153 }
1154 
1155 /*
1156  * Trigger writeback of all the dirty metadata in the file system.
1157  *
1158  * This ensures that the metadata is written to their location on disk rather
1159  * than just existing in transactions in the log. This means after a quiesce
1160  * there is no log replay required to write the inodes to disk - this is the
1161  * primary difference between a sync and a quiesce.
1162  *
1163  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1164  * it is started again when appropriate.
1165  */
1166 static void
1167 xfs_quiesce_attr(
1168         struct xfs_mount        *mp)
1169 {
1170         int     error = 0;
1171 
1172         /* wait for all modifications to complete */
1173         while (atomic_read(&mp->m_active_trans) > 0)
1174                 delay(100);
1175 
1176         /* force the log to unpin objects from the now complete transactions */
1177         xfs_log_force(mp, XFS_LOG_SYNC);
1178 
1179         /* reclaim inodes to do any IO before the freeze completes */
1180         xfs_reclaim_inodes(mp, 0);
1181         xfs_reclaim_inodes(mp, SYNC_WAIT);
1182 
1183         /* Push the superblock and write an unmount record */
1184         error = xfs_log_sbcount(mp);
1185         if (error)
1186                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1187                                 "Frozen image may not be consistent.");
1188         /*
1189          * Just warn here till VFS can correctly support
1190          * read-only remount without racing.
1191          */
1192         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1193 
1194         xfs_log_quiesce(mp);
1195 }
1196 
1197 STATIC int
1198 xfs_fs_remount(
1199         struct super_block      *sb,
1200         int                     *flags,
1201         char                    *options)
1202 {
1203         struct xfs_mount        *mp = XFS_M(sb);
1204         xfs_sb_t                *sbp = &mp->m_sb;
1205         substring_t             args[MAX_OPT_ARGS];
1206         char                    *p;
1207         int                     error;
1208 
1209         sync_filesystem(sb);
1210         while ((p = strsep(&options, ",")) != NULL) {
1211                 int token;
1212 
1213                 if (!*p)
1214                         continue;
1215 
1216                 token = match_token(p, tokens, args);
1217                 switch (token) {
1218                 case Opt_barrier:
1219                         mp->m_flags |= XFS_MOUNT_BARRIER;
1220                         break;
1221                 case Opt_nobarrier:
1222                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
1223                         break;
1224                 case Opt_inode64:
1225                         mp->m_maxagi = xfs_set_inode64(mp, sbp->sb_agcount);
1226                         break;
1227                 case Opt_inode32:
1228                         mp->m_maxagi = xfs_set_inode32(mp, sbp->sb_agcount);
1229                         break;
1230                 default:
1231                         /*
1232                          * Logically we would return an error here to prevent
1233                          * users from believing they might have changed
1234                          * mount options using remount which can't be changed.
1235                          *
1236                          * But unfortunately mount(8) adds all options from
1237                          * mtab and fstab to the mount arguments in some cases
1238                          * so we can't blindly reject options, but have to
1239                          * check for each specified option if it actually
1240                          * differs from the currently set option and only
1241                          * reject it if that's the case.
1242                          *
1243                          * Until that is implemented we return success for
1244                          * every remount request, and silently ignore all
1245                          * options that we can't actually change.
1246                          */
1247 #if 0
1248                         xfs_info(mp,
1249                 "mount option \"%s\" not supported for remount", p);
1250                         return -EINVAL;
1251 #else
1252                         break;
1253 #endif
1254                 }
1255         }
1256 
1257         /* ro -> rw */
1258         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1259                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1260 
1261                 /*
1262                  * If this is the first remount to writeable state we
1263                  * might have some superblock changes to update.
1264                  */
1265                 if (mp->m_update_sb) {
1266                         error = xfs_sync_sb(mp, false);
1267                         if (error) {
1268                                 xfs_warn(mp, "failed to write sb changes");
1269                                 return error;
1270                         }
1271                         mp->m_update_sb = false;
1272                 }
1273 
1274                 /*
1275                  * Fill out the reserve pool if it is empty. Use the stashed
1276                  * value if it is non-zero, otherwise go with the default.
1277                  */
1278                 xfs_restore_resvblks(mp);
1279                 xfs_log_work_queue(mp);
1280         }
1281 
1282         /* rw -> ro */
1283         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1284                 /*
1285                  * Before we sync the metadata, we need to free up the reserve
1286                  * block pool so that the used block count in the superblock on
1287                  * disk is correct at the end of the remount. Stash the current
1288                  * reserve pool size so that if we get remounted rw, we can
1289                  * return it to the same size.
1290                  */
1291                 xfs_save_resvblks(mp);
1292                 xfs_quiesce_attr(mp);
1293                 mp->m_flags |= XFS_MOUNT_RDONLY;
1294         }
1295 
1296         return 0;
1297 }
1298 
1299 /*
1300  * Second stage of a freeze. The data is already frozen so we only
1301  * need to take care of the metadata. Once that's done sync the superblock
1302  * to the log to dirty it in case of a crash while frozen. This ensures that we
1303  * will recover the unlinked inode lists on the next mount.
1304  */
1305 STATIC int
1306 xfs_fs_freeze(
1307         struct super_block      *sb)
1308 {
1309         struct xfs_mount        *mp = XFS_M(sb);
1310 
1311         xfs_save_resvblks(mp);
1312         xfs_quiesce_attr(mp);
1313         return xfs_sync_sb(mp, true);
1314 }
1315 
1316 STATIC int
1317 xfs_fs_unfreeze(
1318         struct super_block      *sb)
1319 {
1320         struct xfs_mount        *mp = XFS_M(sb);
1321 
1322         xfs_restore_resvblks(mp);
1323         xfs_log_work_queue(mp);
1324         return 0;
1325 }
1326 
1327 STATIC int
1328 xfs_fs_show_options(
1329         struct seq_file         *m,
1330         struct dentry           *root)
1331 {
1332         return xfs_showargs(XFS_M(root->d_sb), m);
1333 }
1334 
1335 /*
1336  * This function fills in xfs_mount_t fields based on mount args.
1337  * Note: the superblock _has_ now been read in.
1338  */
1339 STATIC int
1340 xfs_finish_flags(
1341         struct xfs_mount        *mp)
1342 {
1343         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1344 
1345         /* Fail a mount where the logbuf is smaller than the log stripe */
1346         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1347                 if (mp->m_logbsize <= 0 &&
1348                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1349                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1350                 } else if (mp->m_logbsize > 0 &&
1351                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1352                         xfs_warn(mp,
1353                 "logbuf size must be greater than or equal to log stripe size");
1354                         return -EINVAL;
1355                 }
1356         } else {
1357                 /* Fail a mount if the logbuf is larger than 32K */
1358                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1359                         xfs_warn(mp,
1360                 "logbuf size for version 1 logs must be 16K or 32K");
1361                         return -EINVAL;
1362                 }
1363         }
1364 
1365         /*
1366          * V5 filesystems always use attr2 format for attributes.
1367          */
1368         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1369             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1370                 xfs_warn(mp,
1371 "Cannot mount a V5 filesystem as %s. %s is always enabled for V5 filesystems.",
1372                         MNTOPT_NOATTR2, MNTOPT_ATTR2);
1373                 return -EINVAL;
1374         }
1375 
1376         /*
1377          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1378          * told by noattr2 to turn it off
1379          */
1380         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1381             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1382                 mp->m_flags |= XFS_MOUNT_ATTR2;
1383 
1384         /*
1385          * prohibit r/w mounts of read-only filesystems
1386          */
1387         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1388                 xfs_warn(mp,
1389                         "cannot mount a read-only filesystem as read-write");
1390                 return -EROFS;
1391         }
1392 
1393         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1394             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1395             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1396                 xfs_warn(mp,
1397                   "Super block does not support project and group quota together");
1398                 return -EINVAL;
1399         }
1400 
1401         return 0;
1402 }
1403 
1404 STATIC int
1405 xfs_fs_fill_super(
1406         struct super_block      *sb,
1407         void                    *data,
1408         int                     silent)
1409 {
1410         struct inode            *root;
1411         struct xfs_mount        *mp = NULL;
1412         int                     flags = 0, error = -ENOMEM;
1413 
1414         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1415         if (!mp)
1416                 goto out;
1417 
1418         spin_lock_init(&mp->m_sb_lock);
1419         mutex_init(&mp->m_growlock);
1420         atomic_set(&mp->m_active_trans, 0);
1421         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1422         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1423         mp->m_kobj.kobject.kset = xfs_kset;
1424 
1425         mp->m_super = sb;
1426         sb->s_fs_info = mp;
1427 
1428         error = xfs_parseargs(mp, (char *)data);
1429         if (error)
1430                 goto out_free_fsname;
1431 
1432         sb_min_blocksize(sb, BBSIZE);
1433         sb->s_xattr = xfs_xattr_handlers;
1434         sb->s_export_op = &xfs_export_operations;
1435 #ifdef CONFIG_XFS_QUOTA
1436         sb->s_qcop = &xfs_quotactl_operations;
1437         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1438 #endif
1439         sb->s_op = &xfs_super_operations;
1440 
1441         if (silent)
1442                 flags |= XFS_MFSI_QUIET;
1443 
1444         error = xfs_open_devices(mp);
1445         if (error)
1446                 goto out_free_fsname;
1447 
1448         error = xfs_init_mount_workqueues(mp);
1449         if (error)
1450                 goto out_close_devices;
1451 
1452         error = xfs_icsb_init_counters(mp);
1453         if (error)
1454                 goto out_destroy_workqueues;
1455 
1456         error = xfs_readsb(mp, flags);
1457         if (error)
1458                 goto out_destroy_counters;
1459 
1460         error = xfs_finish_flags(mp);
1461         if (error)
1462                 goto out_free_sb;
1463 
1464         error = xfs_setup_devices(mp);
1465         if (error)
1466                 goto out_free_sb;
1467 
1468         error = xfs_filestream_mount(mp);
1469         if (error)
1470                 goto out_free_sb;
1471 
1472         /*
1473          * we must configure the block size in the superblock before we run the
1474          * full mount process as the mount process can lookup and cache inodes.
1475          */
1476         sb->s_magic = XFS_SB_MAGIC;
1477         sb->s_blocksize = mp->m_sb.sb_blocksize;
1478         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1479         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1480         sb->s_max_links = XFS_MAXLINK;
1481         sb->s_time_gran = 1;
1482         set_posix_acl_flag(sb);
1483 
1484         /* version 5 superblocks support inode version counters. */
1485         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1486                 sb->s_flags |= MS_I_VERSION;
1487 
1488         error = xfs_mountfs(mp);
1489         if (error)
1490                 goto out_filestream_unmount;
1491 
1492         root = igrab(VFS_I(mp->m_rootip));
1493         if (!root) {
1494                 error = -ENOENT;
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 long
1538 xfs_fs_nr_cached_objects(
1539         struct super_block      *sb,
1540         struct shrink_control   *sc)
1541 {
1542         return xfs_reclaim_inodes_count(XFS_M(sb));
1543 }
1544 
1545 static long
1546 xfs_fs_free_cached_objects(
1547         struct super_block      *sb,
1548         struct shrink_control   *sc)
1549 {
1550         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1551 }
1552 
1553 static const struct super_operations xfs_super_operations = {
1554         .alloc_inode            = xfs_fs_alloc_inode,
1555         .destroy_inode          = xfs_fs_destroy_inode,
1556         .evict_inode            = xfs_fs_evict_inode,
1557         .drop_inode             = xfs_fs_drop_inode,
1558         .put_super              = xfs_fs_put_super,
1559         .sync_fs                = xfs_fs_sync_fs,
1560         .freeze_fs              = xfs_fs_freeze,
1561         .unfreeze_fs            = xfs_fs_unfreeze,
1562         .statfs                 = xfs_fs_statfs,
1563         .remount_fs             = xfs_fs_remount,
1564         .show_options           = xfs_fs_show_options,
1565         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1566         .free_cached_objects    = xfs_fs_free_cached_objects,
1567 };
1568 
1569 static struct file_system_type xfs_fs_type = {
1570         .owner                  = THIS_MODULE,
1571         .name                   = "xfs",
1572         .mount                  = xfs_fs_mount,
1573         .kill_sb                = kill_block_super,
1574         .fs_flags               = FS_REQUIRES_DEV,
1575 };
1576 MODULE_ALIAS_FS("xfs");
1577 
1578 STATIC int __init
1579 xfs_init_zones(void)
1580 {
1581 
1582         xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
1583         if (!xfs_ioend_zone)
1584                 goto out;
1585 
1586         xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
1587                                                   xfs_ioend_zone);
1588         if (!xfs_ioend_pool)
1589                 goto out_destroy_ioend_zone;
1590 
1591         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1592                                                 "xfs_log_ticket");
1593         if (!xfs_log_ticket_zone)
1594                 goto out_destroy_ioend_pool;
1595 
1596         xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
1597                                                 "xfs_bmap_free_item");
1598         if (!xfs_bmap_free_item_zone)
1599                 goto out_destroy_log_ticket_zone;
1600 
1601         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1602                                                 "xfs_btree_cur");
1603         if (!xfs_btree_cur_zone)
1604                 goto out_destroy_bmap_free_item_zone;
1605 
1606         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1607                                                 "xfs_da_state");
1608         if (!xfs_da_state_zone)
1609                 goto out_destroy_btree_cur_zone;
1610 
1611         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1612         if (!xfs_ifork_zone)
1613                 goto out_destroy_da_state_zone;
1614 
1615         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1616         if (!xfs_trans_zone)
1617                 goto out_destroy_ifork_zone;
1618 
1619         xfs_log_item_desc_zone =
1620                 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1621                                "xfs_log_item_desc");
1622         if (!xfs_log_item_desc_zone)
1623                 goto out_destroy_trans_zone;
1624 
1625         /*
1626          * The size of the zone allocated buf log item is the maximum
1627          * size possible under XFS.  This wastes a little bit of memory,
1628          * but it is much faster.
1629          */
1630         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1631                                            "xfs_buf_item");
1632         if (!xfs_buf_item_zone)
1633                 goto out_destroy_log_item_desc_zone;
1634 
1635         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1636                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1637                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1638         if (!xfs_efd_zone)
1639                 goto out_destroy_buf_item_zone;
1640 
1641         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1642                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1643                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1644         if (!xfs_efi_zone)
1645                 goto out_destroy_efd_zone;
1646 
1647         xfs_inode_zone =
1648                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1649                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD,
1650                         xfs_fs_inode_init_once);
1651         if (!xfs_inode_zone)
1652                 goto out_destroy_efi_zone;
1653 
1654         xfs_ili_zone =
1655                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1656                                         KM_ZONE_SPREAD, NULL);
1657         if (!xfs_ili_zone)
1658                 goto out_destroy_inode_zone;
1659         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1660                                         "xfs_icr");
1661         if (!xfs_icreate_zone)
1662                 goto out_destroy_ili_zone;
1663 
1664         return 0;
1665 
1666  out_destroy_ili_zone:
1667         kmem_zone_destroy(xfs_ili_zone);
1668  out_destroy_inode_zone:
1669         kmem_zone_destroy(xfs_inode_zone);
1670  out_destroy_efi_zone:
1671         kmem_zone_destroy(xfs_efi_zone);
1672  out_destroy_efd_zone:
1673         kmem_zone_destroy(xfs_efd_zone);
1674  out_destroy_buf_item_zone:
1675         kmem_zone_destroy(xfs_buf_item_zone);
1676  out_destroy_log_item_desc_zone:
1677         kmem_zone_destroy(xfs_log_item_desc_zone);
1678  out_destroy_trans_zone:
1679         kmem_zone_destroy(xfs_trans_zone);
1680  out_destroy_ifork_zone:
1681         kmem_zone_destroy(xfs_ifork_zone);
1682  out_destroy_da_state_zone:
1683         kmem_zone_destroy(xfs_da_state_zone);
1684  out_destroy_btree_cur_zone:
1685         kmem_zone_destroy(xfs_btree_cur_zone);
1686  out_destroy_bmap_free_item_zone:
1687         kmem_zone_destroy(xfs_bmap_free_item_zone);
1688  out_destroy_log_ticket_zone:
1689         kmem_zone_destroy(xfs_log_ticket_zone);
1690  out_destroy_ioend_pool:
1691         mempool_destroy(xfs_ioend_pool);
1692  out_destroy_ioend_zone:
1693         kmem_zone_destroy(xfs_ioend_zone);
1694  out:
1695         return -ENOMEM;
1696 }
1697 
1698 STATIC void
1699 xfs_destroy_zones(void)
1700 {
1701         /*
1702          * Make sure all delayed rcu free are flushed before we
1703          * destroy caches.
1704          */
1705         rcu_barrier();
1706         kmem_zone_destroy(xfs_icreate_zone);
1707         kmem_zone_destroy(xfs_ili_zone);
1708         kmem_zone_destroy(xfs_inode_zone);
1709         kmem_zone_destroy(xfs_efi_zone);
1710         kmem_zone_destroy(xfs_efd_zone);
1711         kmem_zone_destroy(xfs_buf_item_zone);
1712         kmem_zone_destroy(xfs_log_item_desc_zone);
1713         kmem_zone_destroy(xfs_trans_zone);
1714         kmem_zone_destroy(xfs_ifork_zone);
1715         kmem_zone_destroy(xfs_da_state_zone);
1716         kmem_zone_destroy(xfs_btree_cur_zone);
1717         kmem_zone_destroy(xfs_bmap_free_item_zone);
1718         kmem_zone_destroy(xfs_log_ticket_zone);
1719         mempool_destroy(xfs_ioend_pool);
1720         kmem_zone_destroy(xfs_ioend_zone);
1721 
1722 }
1723 
1724 STATIC int __init
1725 xfs_init_workqueues(void)
1726 {
1727         /*
1728          * The allocation workqueue can be used in memory reclaim situations
1729          * (writepage path), and parallelism is only limited by the number of
1730          * AGs in all the filesystems mounted. Hence use the default large
1731          * max_active value for this workqueue.
1732          */
1733         xfs_alloc_wq = alloc_workqueue("xfsalloc",
1734                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
1735         if (!xfs_alloc_wq)
1736                 return -ENOMEM;
1737 
1738         return 0;
1739 }
1740 
1741 STATIC void
1742 xfs_destroy_workqueues(void)
1743 {
1744         destroy_workqueue(xfs_alloc_wq);
1745 }
1746 
1747 STATIC int __init
1748 init_xfs_fs(void)
1749 {
1750         int                     error;
1751 
1752         printk(KERN_INFO XFS_VERSION_STRING " with "
1753                          XFS_BUILD_OPTIONS " enabled\n");
1754 
1755         xfs_dir_startup();
1756 
1757         error = xfs_init_zones();
1758         if (error)
1759                 goto out;
1760 
1761         error = xfs_init_workqueues();
1762         if (error)
1763                 goto out_destroy_zones;
1764 
1765         error = xfs_mru_cache_init();
1766         if (error)
1767                 goto out_destroy_wq;
1768 
1769         error = xfs_buf_init();
1770         if (error)
1771                 goto out_mru_cache_uninit;
1772 
1773         error = xfs_init_procfs();
1774         if (error)
1775                 goto out_buf_terminate;
1776 
1777         error = xfs_sysctl_register();
1778         if (error)
1779                 goto out_cleanup_procfs;
1780 
1781         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
1782         if (!xfs_kset) {
1783                 error = -ENOMEM;
1784                 goto out_sysctl_unregister;;
1785         }
1786 
1787 #ifdef DEBUG
1788         xfs_dbg_kobj.kobject.kset = xfs_kset;
1789         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
1790         if (error)
1791                 goto out_kset_unregister;
1792 #endif
1793 
1794         error = xfs_qm_init();
1795         if (error)
1796                 goto out_remove_kobj;
1797 
1798         error = register_filesystem(&xfs_fs_type);
1799         if (error)
1800                 goto out_qm_exit;
1801         return 0;
1802 
1803  out_qm_exit:
1804         xfs_qm_exit();
1805  out_remove_kobj:
1806 #ifdef DEBUG
1807         xfs_sysfs_del(&xfs_dbg_kobj);
1808  out_kset_unregister:
1809 #endif
1810         kset_unregister(xfs_kset);
1811  out_sysctl_unregister:
1812         xfs_sysctl_unregister();
1813  out_cleanup_procfs:
1814         xfs_cleanup_procfs();
1815  out_buf_terminate:
1816         xfs_buf_terminate();
1817  out_mru_cache_uninit:
1818         xfs_mru_cache_uninit();
1819  out_destroy_wq:
1820         xfs_destroy_workqueues();
1821  out_destroy_zones:
1822         xfs_destroy_zones();
1823  out:
1824         return error;
1825 }
1826 
1827 STATIC void __exit
1828 exit_xfs_fs(void)
1829 {
1830         xfs_qm_exit();
1831         unregister_filesystem(&xfs_fs_type);
1832 #ifdef DEBUG
1833         xfs_sysfs_del(&xfs_dbg_kobj);
1834 #endif
1835         kset_unregister(xfs_kset);
1836         xfs_sysctl_unregister();
1837         xfs_cleanup_procfs();
1838         xfs_buf_terminate();
1839         xfs_mru_cache_uninit();
1840         xfs_destroy_workqueues();
1841         xfs_destroy_zones();
1842 }
1843 
1844 module_init(init_xfs_fs);
1845 module_exit(exit_xfs_fs);
1846 
1847 MODULE_AUTHOR("Silicon Graphics, Inc.");
1848 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
1849 MODULE_LICENSE("GPL");
1850 

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