Version:  2.0.40 2.2.26 2.4.37 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 4.1

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_DISCARD     "discard"    /* Discard unused blocks */
113 #define MNTOPT_NODISCARD   "nodiscard"  /* Do not discard unused blocks */
114 
115 /*
116  * Table driven mount option parser.
117  *
118  * Currently only used for remount, but it will be used for mount
119  * in the future, too.
120  */
121 enum {
122         Opt_barrier,
123         Opt_nobarrier,
124         Opt_inode64,
125         Opt_inode32,
126         Opt_err
127 };
128 
129 static const match_table_t tokens = {
130         {Opt_barrier, "barrier"},
131         {Opt_nobarrier, "nobarrier"},
132         {Opt_inode64, "inode64"},
133         {Opt_inode32, "inode32"},
134         {Opt_err, NULL}
135 };
136 
137 
138 STATIC unsigned long
139 suffix_kstrtoint(char *s, unsigned int base, int *res)
140 {
141         int     last, shift_left_factor = 0, _res;
142         char    *value = s;
143 
144         last = strlen(value) - 1;
145         if (value[last] == 'K' || value[last] == 'k') {
146                 shift_left_factor = 10;
147                 value[last] = '\0';
148         }
149         if (value[last] == 'M' || value[last] == 'm') {
150                 shift_left_factor = 20;
151                 value[last] = '\0';
152         }
153         if (value[last] == 'G' || value[last] == 'g') {
154                 shift_left_factor = 30;
155                 value[last] = '\0';
156         }
157 
158         if (kstrtoint(s, base, &_res))
159                 return -EINVAL;
160         *res = _res << shift_left_factor;
161         return 0;
162 }
163 
164 /*
165  * This function fills in xfs_mount_t fields based on mount args.
166  * Note: the superblock has _not_ yet been read in.
167  *
168  * Note that this function leaks the various device name allocations on
169  * failure.  The caller takes care of them.
170  */
171 STATIC int
172 xfs_parseargs(
173         struct xfs_mount        *mp,
174         char                    *options)
175 {
176         struct super_block      *sb = mp->m_super;
177         char                    *this_char, *value;
178         int                     dsunit = 0;
179         int                     dswidth = 0;
180         int                     iosize = 0;
181         __uint8_t               iosizelog = 0;
182 
183         /*
184          * set up the mount name first so all the errors will refer to the
185          * correct device.
186          */
187         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
188         if (!mp->m_fsname)
189                 return -ENOMEM;
190         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
191 
192         /*
193          * Copy binary VFS mount flags we are interested in.
194          */
195         if (sb->s_flags & MS_RDONLY)
196                 mp->m_flags |= XFS_MOUNT_RDONLY;
197         if (sb->s_flags & MS_DIRSYNC)
198                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
199         if (sb->s_flags & MS_SYNCHRONOUS)
200                 mp->m_flags |= XFS_MOUNT_WSYNC;
201 
202         /*
203          * Set some default flags that could be cleared by the mount option
204          * parsing.
205          */
206         mp->m_flags |= XFS_MOUNT_BARRIER;
207         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
208 
209         /*
210          * These can be overridden by the mount option parsing.
211          */
212         mp->m_logbufs = -1;
213         mp->m_logbsize = -1;
214 
215         if (!options)
216                 goto done;
217 
218         while ((this_char = strsep(&options, ",")) != NULL) {
219                 if (!*this_char)
220                         continue;
221                 if ((value = strchr(this_char, '=')) != NULL)
222                         *value++ = 0;
223 
224                 if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
225                         if (!value || !*value) {
226                                 xfs_warn(mp, "%s option requires an argument",
227                                         this_char);
228                                 return -EINVAL;
229                         }
230                         if (kstrtoint(value, 10, &mp->m_logbufs))
231                                 return -EINVAL;
232                 } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
233                         if (!value || !*value) {
234                                 xfs_warn(mp, "%s option requires an argument",
235                                         this_char);
236                                 return -EINVAL;
237                         }
238                         if (suffix_kstrtoint(value, 10, &mp->m_logbsize))
239                                 return -EINVAL;
240                 } else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
241                         if (!value || !*value) {
242                                 xfs_warn(mp, "%s option requires an argument",
243                                         this_char);
244                                 return -EINVAL;
245                         }
246                         mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
247                         if (!mp->m_logname)
248                                 return -ENOMEM;
249                 } else if (!strcmp(this_char, MNTOPT_MTPT)) {
250                         xfs_warn(mp, "%s option not allowed on this system",
251                                 this_char);
252                         return -EINVAL;
253                 } else if (!strcmp(this_char, MNTOPT_RTDEV)) {
254                         if (!value || !*value) {
255                                 xfs_warn(mp, "%s option requires an argument",
256                                         this_char);
257                                 return -EINVAL;
258                         }
259                         mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
260                         if (!mp->m_rtname)
261                                 return -ENOMEM;
262                 } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
263                         if (!value || !*value) {
264                                 xfs_warn(mp, "%s option requires an argument",
265                                         this_char);
266                                 return -EINVAL;
267                         }
268                         if (kstrtoint(value, 10, &iosize))
269                                 return -EINVAL;
270                         iosizelog = ffs(iosize) - 1;
271                 } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
272                         if (!value || !*value) {
273                                 xfs_warn(mp, "%s option requires an argument",
274                                         this_char);
275                                 return -EINVAL;
276                         }
277                         if (suffix_kstrtoint(value, 10, &iosize))
278                                 return -EINVAL;
279                         iosizelog = ffs(iosize) - 1;
280                 } else if (!strcmp(this_char, MNTOPT_GRPID) ||
281                            !strcmp(this_char, MNTOPT_BSDGROUPS)) {
282                         mp->m_flags |= XFS_MOUNT_GRPID;
283                 } else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
284                            !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
285                         mp->m_flags &= ~XFS_MOUNT_GRPID;
286                 } else if (!strcmp(this_char, MNTOPT_WSYNC)) {
287                         mp->m_flags |= XFS_MOUNT_WSYNC;
288                 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
289                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
290                 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
291                         mp->m_flags |= XFS_MOUNT_NOALIGN;
292                 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
293                         mp->m_flags |= XFS_MOUNT_SWALLOC;
294                 } else if (!strcmp(this_char, MNTOPT_SUNIT)) {
295                         if (!value || !*value) {
296                                 xfs_warn(mp, "%s option requires an argument",
297                                         this_char);
298                                 return -EINVAL;
299                         }
300                         if (kstrtoint(value, 10, &dsunit))
301                                 return -EINVAL;
302                 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
303                         if (!value || !*value) {
304                                 xfs_warn(mp, "%s option requires an argument",
305                                         this_char);
306                                 return -EINVAL;
307                         }
308                         if (kstrtoint(value, 10, &dswidth))
309                                 return -EINVAL;
310                 } else if (!strcmp(this_char, MNTOPT_32BITINODE)) {
311                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
312                 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
313                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
314                 } else if (!strcmp(this_char, MNTOPT_NOUUID)) {
315                         mp->m_flags |= XFS_MOUNT_NOUUID;
316                 } else if (!strcmp(this_char, MNTOPT_BARRIER)) {
317                         mp->m_flags |= XFS_MOUNT_BARRIER;
318                 } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
319                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
320                 } else if (!strcmp(this_char, MNTOPT_IKEEP)) {
321                         mp->m_flags |= XFS_MOUNT_IKEEP;
322                 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
323                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
324                 } else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
325                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
326                 } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
327                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
328                 } else if (!strcmp(this_char, MNTOPT_ATTR2)) {
329                         mp->m_flags |= XFS_MOUNT_ATTR2;
330                 } else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
331                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
332                         mp->m_flags |= XFS_MOUNT_NOATTR2;
333                 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
334                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
335                 } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
336                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
337                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
338                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
339                 } else if (!strcmp(this_char, MNTOPT_QUOTA) ||
340                            !strcmp(this_char, MNTOPT_UQUOTA) ||
341                            !strcmp(this_char, MNTOPT_USRQUOTA)) {
342                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
343                                          XFS_UQUOTA_ENFD);
344                 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
345                            !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
346                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
347                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
348                 } else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
349                            !strcmp(this_char, MNTOPT_PRJQUOTA)) {
350                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
351                                          XFS_PQUOTA_ENFD);
352                 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
353                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
354                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
355                 } else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
356                            !strcmp(this_char, MNTOPT_GRPQUOTA)) {
357                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
358                                          XFS_GQUOTA_ENFD);
359                 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
360                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
361                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
362                 } else if (!strcmp(this_char, MNTOPT_DISCARD)) {
363                         mp->m_flags |= XFS_MOUNT_DISCARD;
364                 } else if (!strcmp(this_char, MNTOPT_NODISCARD)) {
365                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
366                 } else {
367                         xfs_warn(mp, "unknown mount option [%s].", this_char);
368                         return -EINVAL;
369                 }
370         }
371 
372         /*
373          * no recovery flag requires a read-only mount
374          */
375         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
376             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
377                 xfs_warn(mp, "no-recovery mounts must be read-only.");
378                 return -EINVAL;
379         }
380 
381         if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
382                 xfs_warn(mp,
383         "sunit and swidth options incompatible with the noalign option");
384                 return -EINVAL;
385         }
386 
387 #ifndef CONFIG_XFS_QUOTA
388         if (XFS_IS_QUOTA_RUNNING(mp)) {
389                 xfs_warn(mp, "quota support not available in this kernel.");
390                 return -EINVAL;
391         }
392 #endif
393 
394         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
395                 xfs_warn(mp, "sunit and swidth must be specified together");
396                 return -EINVAL;
397         }
398 
399         if (dsunit && (dswidth % dsunit != 0)) {
400                 xfs_warn(mp,
401         "stripe width (%d) must be a multiple of the stripe unit (%d)",
402                         dswidth, dsunit);
403                 return -EINVAL;
404         }
405 
406 done:
407         if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
408                 /*
409                  * At this point the superblock has not been read
410                  * in, therefore we do not know the block size.
411                  * Before the mount call ends we will convert
412                  * these to FSBs.
413                  */
414                 mp->m_dalign = dsunit;
415                 mp->m_swidth = dswidth;
416         }
417 
418         if (mp->m_logbufs != -1 &&
419             mp->m_logbufs != 0 &&
420             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
421              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
422                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
423                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
424                 return -EINVAL;
425         }
426         if (mp->m_logbsize != -1 &&
427             mp->m_logbsize !=  0 &&
428             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
429              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
430              !is_power_of_2(mp->m_logbsize))) {
431                 xfs_warn(mp,
432                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
433                         mp->m_logbsize);
434                 return -EINVAL;
435         }
436 
437         if (iosizelog) {
438                 if (iosizelog > XFS_MAX_IO_LOG ||
439                     iosizelog < XFS_MIN_IO_LOG) {
440                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
441                                 iosizelog, XFS_MIN_IO_LOG,
442                                 XFS_MAX_IO_LOG);
443                         return -EINVAL;
444                 }
445 
446                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
447                 mp->m_readio_log = iosizelog;
448                 mp->m_writeio_log = iosizelog;
449         }
450 
451         return 0;
452 }
453 
454 struct proc_xfs_info {
455         int     flag;
456         char    *str;
457 };
458 
459 STATIC int
460 xfs_showargs(
461         struct xfs_mount        *mp,
462         struct seq_file         *m)
463 {
464         static struct proc_xfs_info xfs_info_set[] = {
465                 /* the few simple ones we can get from the mount struct */
466                 { XFS_MOUNT_IKEEP,              "," MNTOPT_IKEEP },
467                 { XFS_MOUNT_WSYNC,              "," MNTOPT_WSYNC },
468                 { XFS_MOUNT_NOALIGN,            "," MNTOPT_NOALIGN },
469                 { XFS_MOUNT_SWALLOC,            "," MNTOPT_SWALLOC },
470                 { XFS_MOUNT_NOUUID,             "," MNTOPT_NOUUID },
471                 { XFS_MOUNT_NORECOVERY,         "," MNTOPT_NORECOVERY },
472                 { XFS_MOUNT_ATTR2,              "," MNTOPT_ATTR2 },
473                 { XFS_MOUNT_FILESTREAMS,        "," MNTOPT_FILESTREAM },
474                 { XFS_MOUNT_GRPID,              "," MNTOPT_GRPID },
475                 { XFS_MOUNT_DISCARD,            "," MNTOPT_DISCARD },
476                 { XFS_MOUNT_SMALL_INUMS,        "," MNTOPT_32BITINODE },
477                 { 0, NULL }
478         };
479         static struct proc_xfs_info xfs_info_unset[] = {
480                 /* the few simple ones we can get from the mount struct */
481                 { XFS_MOUNT_COMPAT_IOSIZE,      "," MNTOPT_LARGEIO },
482                 { XFS_MOUNT_BARRIER,            "," MNTOPT_NOBARRIER },
483                 { XFS_MOUNT_SMALL_INUMS,        "," MNTOPT_64BITINODE },
484                 { 0, NULL }
485         };
486         struct proc_xfs_info    *xfs_infop;
487 
488         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
489                 if (mp->m_flags & xfs_infop->flag)
490                         seq_puts(m, xfs_infop->str);
491         }
492         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
493                 if (!(mp->m_flags & xfs_infop->flag))
494                         seq_puts(m, xfs_infop->str);
495         }
496 
497         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
498                 seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk",
499                                 (int)(1 << mp->m_writeio_log) >> 10);
500 
501         if (mp->m_logbufs > 0)
502                 seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
503         if (mp->m_logbsize > 0)
504                 seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10);
505 
506         if (mp->m_logname)
507                 seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname);
508         if (mp->m_rtname)
509                 seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname);
510 
511         if (mp->m_dalign > 0)
512                 seq_printf(m, "," MNTOPT_SUNIT "=%d",
513                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
514         if (mp->m_swidth > 0)
515                 seq_printf(m, "," MNTOPT_SWIDTH "=%d",
516                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
517 
518         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
519                 seq_puts(m, "," MNTOPT_USRQUOTA);
520         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
521                 seq_puts(m, "," MNTOPT_UQUOTANOENF);
522 
523         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
524                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
525                         seq_puts(m, "," MNTOPT_PRJQUOTA);
526                 else
527                         seq_puts(m, "," MNTOPT_PQUOTANOENF);
528         }
529         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
530                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
531                         seq_puts(m, "," MNTOPT_GRPQUOTA);
532                 else
533                         seq_puts(m, "," MNTOPT_GQUOTANOENF);
534         }
535 
536         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
537                 seq_puts(m, "," MNTOPT_NOQUOTA);
538 
539         return 0;
540 }
541 __uint64_t
542 xfs_max_file_offset(
543         unsigned int            blockshift)
544 {
545         unsigned int            pagefactor = 1;
546         unsigned int            bitshift = BITS_PER_LONG - 1;
547 
548         /* Figure out maximum filesize, on Linux this can depend on
549          * the filesystem blocksize (on 32 bit platforms).
550          * __block_write_begin does this in an [unsigned] long...
551          *      page->index << (PAGE_CACHE_SHIFT - bbits)
552          * So, for page sized blocks (4K on 32 bit platforms),
553          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
554          *      (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
555          * but for smaller blocksizes it is less (bbits = log2 bsize).
556          * Note1: get_block_t takes a long (implicit cast from above)
557          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
558          * can optionally convert the [unsigned] long from above into
559          * an [unsigned] long long.
560          */
561 
562 #if BITS_PER_LONG == 32
563 # if defined(CONFIG_LBDAF)
564         ASSERT(sizeof(sector_t) == 8);
565         pagefactor = PAGE_CACHE_SIZE;
566         bitshift = BITS_PER_LONG;
567 # else
568         pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
569 # endif
570 #endif
571 
572         return (((__uint64_t)pagefactor) << bitshift) - 1;
573 }
574 
575 /*
576  * xfs_set_inode32() and xfs_set_inode64() are passed an agcount
577  * because in the growfs case, mp->m_sb.sb_agcount is not updated
578  * yet to the potentially higher ag count.
579  */
580 xfs_agnumber_t
581 xfs_set_inode32(struct xfs_mount *mp, xfs_agnumber_t agcount)
582 {
583         xfs_agnumber_t  index = 0;
584         xfs_agnumber_t  maxagi = 0;
585         xfs_sb_t        *sbp = &mp->m_sb;
586         xfs_agnumber_t  max_metadata;
587         xfs_agino_t     agino;
588         xfs_ino_t       ino;
589         xfs_perag_t     *pag;
590 
591         /* Calculate how much should be reserved for inodes to meet
592          * the max inode percentage.
593          */
594         if (mp->m_maxicount) {
595                 __uint64_t      icount;
596 
597                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
598                 do_div(icount, 100);
599                 icount += sbp->sb_agblocks - 1;
600                 do_div(icount, sbp->sb_agblocks);
601                 max_metadata = icount;
602         } else {
603                 max_metadata = agcount;
604         }
605 
606         agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
607 
608         for (index = 0; index < agcount; index++) {
609                 ino = XFS_AGINO_TO_INO(mp, index, agino);
610 
611                 if (ino > XFS_MAXINUMBER_32) {
612                         pag = xfs_perag_get(mp, index);
613                         pag->pagi_inodeok = 0;
614                         pag->pagf_metadata = 0;
615                         xfs_perag_put(pag);
616                         continue;
617                 }
618 
619                 pag = xfs_perag_get(mp, index);
620                 pag->pagi_inodeok = 1;
621                 maxagi++;
622                 if (index < max_metadata)
623                         pag->pagf_metadata = 1;
624                 xfs_perag_put(pag);
625         }
626         mp->m_flags |= (XFS_MOUNT_32BITINODES |
627                         XFS_MOUNT_SMALL_INUMS);
628 
629         return maxagi;
630 }
631 
632 xfs_agnumber_t
633 xfs_set_inode64(struct xfs_mount *mp, xfs_agnumber_t agcount)
634 {
635         xfs_agnumber_t index = 0;
636 
637         for (index = 0; index < agcount; index++) {
638                 struct xfs_perag        *pag;
639 
640                 pag = xfs_perag_get(mp, index);
641                 pag->pagi_inodeok = 1;
642                 pag->pagf_metadata = 0;
643                 xfs_perag_put(pag);
644         }
645 
646         /* There is no need for lock protection on m_flags,
647          * the rw_semaphore of the VFS superblock is locked
648          * during mount/umount/remount operations, so this is
649          * enough to avoid concurency on the m_flags field
650          */
651         mp->m_flags &= ~(XFS_MOUNT_32BITINODES |
652                          XFS_MOUNT_SMALL_INUMS);
653         return index;
654 }
655 
656 STATIC int
657 xfs_blkdev_get(
658         xfs_mount_t             *mp,
659         const char              *name,
660         struct block_device     **bdevp)
661 {
662         int                     error = 0;
663 
664         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
665                                     mp);
666         if (IS_ERR(*bdevp)) {
667                 error = PTR_ERR(*bdevp);
668                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
669         }
670 
671         return error;
672 }
673 
674 STATIC void
675 xfs_blkdev_put(
676         struct block_device     *bdev)
677 {
678         if (bdev)
679                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
680 }
681 
682 void
683 xfs_blkdev_issue_flush(
684         xfs_buftarg_t           *buftarg)
685 {
686         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
687 }
688 
689 STATIC void
690 xfs_close_devices(
691         struct xfs_mount        *mp)
692 {
693         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
694                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
695                 xfs_free_buftarg(mp, mp->m_logdev_targp);
696                 xfs_blkdev_put(logdev);
697         }
698         if (mp->m_rtdev_targp) {
699                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
700                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
701                 xfs_blkdev_put(rtdev);
702         }
703         xfs_free_buftarg(mp, mp->m_ddev_targp);
704 }
705 
706 /*
707  * The file system configurations are:
708  *      (1) device (partition) with data and internal log
709  *      (2) logical volume with data and log subvolumes.
710  *      (3) logical volume with data, log, and realtime subvolumes.
711  *
712  * We only have to handle opening the log and realtime volumes here if
713  * they are present.  The data subvolume has already been opened by
714  * get_sb_bdev() and is stored in sb->s_bdev.
715  */
716 STATIC int
717 xfs_open_devices(
718         struct xfs_mount        *mp)
719 {
720         struct block_device     *ddev = mp->m_super->s_bdev;
721         struct block_device     *logdev = NULL, *rtdev = NULL;
722         int                     error;
723 
724         /*
725          * Open real time and log devices - order is important.
726          */
727         if (mp->m_logname) {
728                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
729                 if (error)
730                         goto out;
731         }
732 
733         if (mp->m_rtname) {
734                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
735                 if (error)
736                         goto out_close_logdev;
737 
738                 if (rtdev == ddev || rtdev == logdev) {
739                         xfs_warn(mp,
740         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
741                         error = -EINVAL;
742                         goto out_close_rtdev;
743                 }
744         }
745 
746         /*
747          * Setup xfs_mount buffer target pointers
748          */
749         error = -ENOMEM;
750         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev);
751         if (!mp->m_ddev_targp)
752                 goto out_close_rtdev;
753 
754         if (rtdev) {
755                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev);
756                 if (!mp->m_rtdev_targp)
757                         goto out_free_ddev_targ;
758         }
759 
760         if (logdev && logdev != ddev) {
761                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
762                 if (!mp->m_logdev_targp)
763                         goto out_free_rtdev_targ;
764         } else {
765                 mp->m_logdev_targp = mp->m_ddev_targp;
766         }
767 
768         return 0;
769 
770  out_free_rtdev_targ:
771         if (mp->m_rtdev_targp)
772                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
773  out_free_ddev_targ:
774         xfs_free_buftarg(mp, mp->m_ddev_targp);
775  out_close_rtdev:
776         xfs_blkdev_put(rtdev);
777  out_close_logdev:
778         if (logdev && logdev != ddev)
779                 xfs_blkdev_put(logdev);
780  out:
781         return error;
782 }
783 
784 /*
785  * Setup xfs_mount buffer target pointers based on superblock
786  */
787 STATIC int
788 xfs_setup_devices(
789         struct xfs_mount        *mp)
790 {
791         int                     error;
792 
793         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
794         if (error)
795                 return error;
796 
797         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
798                 unsigned int    log_sector_size = BBSIZE;
799 
800                 if (xfs_sb_version_hassector(&mp->m_sb))
801                         log_sector_size = mp->m_sb.sb_logsectsize;
802                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
803                                             log_sector_size);
804                 if (error)
805                         return error;
806         }
807         if (mp->m_rtdev_targp) {
808                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
809                                             mp->m_sb.sb_sectsize);
810                 if (error)
811                         return error;
812         }
813 
814         return 0;
815 }
816 
817 STATIC int
818 xfs_init_mount_workqueues(
819         struct xfs_mount        *mp)
820 {
821         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
822                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
823         if (!mp->m_buf_workqueue)
824                 goto out;
825 
826         mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
827                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
828         if (!mp->m_data_workqueue)
829                 goto out_destroy_buf;
830 
831         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
832                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
833         if (!mp->m_unwritten_workqueue)
834                 goto out_destroy_data_iodone_queue;
835 
836         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
837                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
838         if (!mp->m_cil_workqueue)
839                 goto out_destroy_unwritten;
840 
841         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
842                         WQ_FREEZABLE, 0, mp->m_fsname);
843         if (!mp->m_reclaim_workqueue)
844                 goto out_destroy_cil;
845 
846         mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
847                         WQ_FREEZABLE|WQ_HIGHPRI, 0, mp->m_fsname);
848         if (!mp->m_log_workqueue)
849                 goto out_destroy_reclaim;
850 
851         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
852                         WQ_FREEZABLE, 0, mp->m_fsname);
853         if (!mp->m_eofblocks_workqueue)
854                 goto out_destroy_log;
855 
856         return 0;
857 
858 out_destroy_log:
859         destroy_workqueue(mp->m_log_workqueue);
860 out_destroy_reclaim:
861         destroy_workqueue(mp->m_reclaim_workqueue);
862 out_destroy_cil:
863         destroy_workqueue(mp->m_cil_workqueue);
864 out_destroy_unwritten:
865         destroy_workqueue(mp->m_unwritten_workqueue);
866 out_destroy_data_iodone_queue:
867         destroy_workqueue(mp->m_data_workqueue);
868 out_destroy_buf:
869         destroy_workqueue(mp->m_buf_workqueue);
870 out:
871         return -ENOMEM;
872 }
873 
874 STATIC void
875 xfs_destroy_mount_workqueues(
876         struct xfs_mount        *mp)
877 {
878         destroy_workqueue(mp->m_eofblocks_workqueue);
879         destroy_workqueue(mp->m_log_workqueue);
880         destroy_workqueue(mp->m_reclaim_workqueue);
881         destroy_workqueue(mp->m_cil_workqueue);
882         destroy_workqueue(mp->m_data_workqueue);
883         destroy_workqueue(mp->m_unwritten_workqueue);
884         destroy_workqueue(mp->m_buf_workqueue);
885 }
886 
887 /*
888  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
889  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
890  * for IO to complete so that we effectively throttle multiple callers to the
891  * rate at which IO is completing.
892  */
893 void
894 xfs_flush_inodes(
895         struct xfs_mount        *mp)
896 {
897         struct super_block      *sb = mp->m_super;
898 
899         if (down_read_trylock(&sb->s_umount)) {
900                 sync_inodes_sb(sb);
901                 up_read(&sb->s_umount);
902         }
903 }
904 
905 /* Catch misguided souls that try to use this interface on XFS */
906 STATIC struct inode *
907 xfs_fs_alloc_inode(
908         struct super_block      *sb)
909 {
910         BUG();
911         return NULL;
912 }
913 
914 /*
915  * Now that the generic code is guaranteed not to be accessing
916  * the linux inode, we can reclaim the inode.
917  */
918 STATIC void
919 xfs_fs_destroy_inode(
920         struct inode            *inode)
921 {
922         struct xfs_inode        *ip = XFS_I(inode);
923 
924         trace_xfs_destroy_inode(ip);
925 
926         XFS_STATS_INC(vn_reclaim);
927 
928         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
929 
930         /*
931          * We should never get here with one of the reclaim flags already set.
932          */
933         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
934         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
935 
936         /*
937          * We always use background reclaim here because even if the
938          * inode is clean, it still may be under IO and hence we have
939          * to take the flush lock. The background reclaim path handles
940          * this more efficiently than we can here, so simply let background
941          * reclaim tear down all inodes.
942          */
943         xfs_inode_set_reclaim_tag(ip);
944 }
945 
946 /*
947  * Slab object creation initialisation for the XFS inode.
948  * This covers only the idempotent fields in the XFS inode;
949  * all other fields need to be initialised on allocation
950  * from the slab. This avoids the need to repeatedly initialise
951  * fields in the xfs inode that left in the initialise state
952  * when freeing the inode.
953  */
954 STATIC void
955 xfs_fs_inode_init_once(
956         void                    *inode)
957 {
958         struct xfs_inode        *ip = inode;
959 
960         memset(ip, 0, sizeof(struct xfs_inode));
961 
962         /* vfs inode */
963         inode_init_once(VFS_I(ip));
964 
965         /* xfs inode */
966         atomic_set(&ip->i_pincount, 0);
967         spin_lock_init(&ip->i_flags_lock);
968 
969         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
970                      "xfsino", ip->i_ino);
971         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
972                      "xfsino", ip->i_ino);
973 }
974 
975 STATIC void
976 xfs_fs_evict_inode(
977         struct inode            *inode)
978 {
979         xfs_inode_t             *ip = XFS_I(inode);
980 
981         ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
982 
983         trace_xfs_evict_inode(ip);
984 
985         truncate_inode_pages_final(&inode->i_data);
986         clear_inode(inode);
987         XFS_STATS_INC(vn_rele);
988         XFS_STATS_INC(vn_remove);
989 
990         xfs_inactive(ip);
991 }
992 
993 /*
994  * We do an unlocked check for XFS_IDONTCACHE here because we are already
995  * serialised against cache hits here via the inode->i_lock and igrab() in
996  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
997  * racing with us, and it avoids needing to grab a spinlock here for every inode
998  * we drop the final reference on.
999  */
1000 STATIC int
1001 xfs_fs_drop_inode(
1002         struct inode            *inode)
1003 {
1004         struct xfs_inode        *ip = XFS_I(inode);
1005 
1006         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1007 }
1008 
1009 STATIC void
1010 xfs_free_fsname(
1011         struct xfs_mount        *mp)
1012 {
1013         kfree(mp->m_fsname);
1014         kfree(mp->m_rtname);
1015         kfree(mp->m_logname);
1016 }
1017 
1018 STATIC int
1019 xfs_fs_sync_fs(
1020         struct super_block      *sb,
1021         int                     wait)
1022 {
1023         struct xfs_mount        *mp = XFS_M(sb);
1024 
1025         /*
1026          * Doing anything during the async pass would be counterproductive.
1027          */
1028         if (!wait)
1029                 return 0;
1030 
1031         xfs_log_force(mp, XFS_LOG_SYNC);
1032         if (laptop_mode) {
1033                 /*
1034                  * The disk must be active because we're syncing.
1035                  * We schedule log work now (now that the disk is
1036                  * active) instead of later (when it might not be).
1037                  */
1038                 flush_delayed_work(&mp->m_log->l_work);
1039         }
1040 
1041         return 0;
1042 }
1043 
1044 STATIC int
1045 xfs_fs_statfs(
1046         struct dentry           *dentry,
1047         struct kstatfs          *statp)
1048 {
1049         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1050         xfs_sb_t                *sbp = &mp->m_sb;
1051         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
1052         __uint64_t              fakeinos, id;
1053         __uint64_t              icount;
1054         __uint64_t              ifree;
1055         __uint64_t              fdblocks;
1056         xfs_extlen_t            lsize;
1057         __int64_t               ffree;
1058 
1059         statp->f_type = XFS_SB_MAGIC;
1060         statp->f_namelen = MAXNAMELEN - 1;
1061 
1062         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1063         statp->f_fsid.val[0] = (u32)id;
1064         statp->f_fsid.val[1] = (u32)(id >> 32);
1065 
1066         icount = percpu_counter_sum(&mp->m_icount);
1067         ifree = percpu_counter_sum(&mp->m_ifree);
1068         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1069 
1070         spin_lock(&mp->m_sb_lock);
1071         statp->f_bsize = sbp->sb_blocksize;
1072         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1073         statp->f_blocks = sbp->sb_dblocks - lsize;
1074         spin_unlock(&mp->m_sb_lock);
1075 
1076         statp->f_bfree = fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1077         statp->f_bavail = statp->f_bfree;
1078 
1079         fakeinos = statp->f_bfree << sbp->sb_inopblog;
1080         statp->f_files = MIN(icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1081         if (mp->m_maxicount)
1082                 statp->f_files = min_t(typeof(statp->f_files),
1083                                         statp->f_files,
1084                                         mp->m_maxicount);
1085 
1086         /* If sb_icount overshot maxicount, report actual allocation */
1087         statp->f_files = max_t(typeof(statp->f_files),
1088                                         statp->f_files,
1089                                         sbp->sb_icount);
1090 
1091         /* make sure statp->f_ffree does not underflow */
1092         ffree = statp->f_files - (icount - ifree);
1093         statp->f_ffree = max_t(__int64_t, ffree, 0);
1094 
1095 
1096         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1097             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1098                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1099                 xfs_qm_statvfs(ip, statp);
1100         return 0;
1101 }
1102 
1103 STATIC void
1104 xfs_save_resvblks(struct xfs_mount *mp)
1105 {
1106         __uint64_t resblks = 0;
1107 
1108         mp->m_resblks_save = mp->m_resblks;
1109         xfs_reserve_blocks(mp, &resblks, NULL);
1110 }
1111 
1112 STATIC void
1113 xfs_restore_resvblks(struct xfs_mount *mp)
1114 {
1115         __uint64_t resblks;
1116 
1117         if (mp->m_resblks_save) {
1118                 resblks = mp->m_resblks_save;
1119                 mp->m_resblks_save = 0;
1120         } else
1121                 resblks = xfs_default_resblks(mp);
1122 
1123         xfs_reserve_blocks(mp, &resblks, NULL);
1124 }
1125 
1126 /*
1127  * Trigger writeback of all the dirty metadata in the file system.
1128  *
1129  * This ensures that the metadata is written to their location on disk rather
1130  * than just existing in transactions in the log. This means after a quiesce
1131  * there is no log replay required to write the inodes to disk - this is the
1132  * primary difference between a sync and a quiesce.
1133  *
1134  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1135  * it is started again when appropriate.
1136  */
1137 static void
1138 xfs_quiesce_attr(
1139         struct xfs_mount        *mp)
1140 {
1141         int     error = 0;
1142 
1143         /* wait for all modifications to complete */
1144         while (atomic_read(&mp->m_active_trans) > 0)
1145                 delay(100);
1146 
1147         /* force the log to unpin objects from the now complete transactions */
1148         xfs_log_force(mp, XFS_LOG_SYNC);
1149 
1150         /* reclaim inodes to do any IO before the freeze completes */
1151         xfs_reclaim_inodes(mp, 0);
1152         xfs_reclaim_inodes(mp, SYNC_WAIT);
1153 
1154         /* Push the superblock and write an unmount record */
1155         error = xfs_log_sbcount(mp);
1156         if (error)
1157                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1158                                 "Frozen image may not be consistent.");
1159         /*
1160          * Just warn here till VFS can correctly support
1161          * read-only remount without racing.
1162          */
1163         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1164 
1165         xfs_log_quiesce(mp);
1166 }
1167 
1168 STATIC int
1169 xfs_fs_remount(
1170         struct super_block      *sb,
1171         int                     *flags,
1172         char                    *options)
1173 {
1174         struct xfs_mount        *mp = XFS_M(sb);
1175         xfs_sb_t                *sbp = &mp->m_sb;
1176         substring_t             args[MAX_OPT_ARGS];
1177         char                    *p;
1178         int                     error;
1179 
1180         sync_filesystem(sb);
1181         while ((p = strsep(&options, ",")) != NULL) {
1182                 int token;
1183 
1184                 if (!*p)
1185                         continue;
1186 
1187                 token = match_token(p, tokens, args);
1188                 switch (token) {
1189                 case Opt_barrier:
1190                         mp->m_flags |= XFS_MOUNT_BARRIER;
1191                         break;
1192                 case Opt_nobarrier:
1193                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
1194                         break;
1195                 case Opt_inode64:
1196                         mp->m_maxagi = xfs_set_inode64(mp, sbp->sb_agcount);
1197                         break;
1198                 case Opt_inode32:
1199                         mp->m_maxagi = xfs_set_inode32(mp, sbp->sb_agcount);
1200                         break;
1201                 default:
1202                         /*
1203                          * Logically we would return an error here to prevent
1204                          * users from believing they might have changed
1205                          * mount options using remount which can't be changed.
1206                          *
1207                          * But unfortunately mount(8) adds all options from
1208                          * mtab and fstab to the mount arguments in some cases
1209                          * so we can't blindly reject options, but have to
1210                          * check for each specified option if it actually
1211                          * differs from the currently set option and only
1212                          * reject it if that's the case.
1213                          *
1214                          * Until that is implemented we return success for
1215                          * every remount request, and silently ignore all
1216                          * options that we can't actually change.
1217                          */
1218 #if 0
1219                         xfs_info(mp,
1220                 "mount option \"%s\" not supported for remount", p);
1221                         return -EINVAL;
1222 #else
1223                         break;
1224 #endif
1225                 }
1226         }
1227 
1228         /* ro -> rw */
1229         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1230                 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1231                         xfs_warn(mp,
1232                 "ro->rw transition prohibited on norecovery mount");
1233                         return -EINVAL;
1234                 }
1235 
1236                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1237 
1238                 /*
1239                  * If this is the first remount to writeable state we
1240                  * might have some superblock changes to update.
1241                  */
1242                 if (mp->m_update_sb) {
1243                         error = xfs_sync_sb(mp, false);
1244                         if (error) {
1245                                 xfs_warn(mp, "failed to write sb changes");
1246                                 return error;
1247                         }
1248                         mp->m_update_sb = false;
1249                 }
1250 
1251                 /*
1252                  * Fill out the reserve pool if it is empty. Use the stashed
1253                  * value if it is non-zero, otherwise go with the default.
1254                  */
1255                 xfs_restore_resvblks(mp);
1256                 xfs_log_work_queue(mp);
1257         }
1258 
1259         /* rw -> ro */
1260         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1261                 /*
1262                  * Before we sync the metadata, we need to free up the reserve
1263                  * block pool so that the used block count in the superblock on
1264                  * disk is correct at the end of the remount. Stash the current
1265                  * reserve pool size so that if we get remounted rw, we can
1266                  * return it to the same size.
1267                  */
1268                 xfs_save_resvblks(mp);
1269                 xfs_quiesce_attr(mp);
1270                 mp->m_flags |= XFS_MOUNT_RDONLY;
1271         }
1272 
1273         return 0;
1274 }
1275 
1276 /*
1277  * Second stage of a freeze. The data is already frozen so we only
1278  * need to take care of the metadata. Once that's done sync the superblock
1279  * to the log to dirty it in case of a crash while frozen. This ensures that we
1280  * will recover the unlinked inode lists on the next mount.
1281  */
1282 STATIC int
1283 xfs_fs_freeze(
1284         struct super_block      *sb)
1285 {
1286         struct xfs_mount        *mp = XFS_M(sb);
1287 
1288         xfs_save_resvblks(mp);
1289         xfs_quiesce_attr(mp);
1290         return xfs_sync_sb(mp, true);
1291 }
1292 
1293 STATIC int
1294 xfs_fs_unfreeze(
1295         struct super_block      *sb)
1296 {
1297         struct xfs_mount        *mp = XFS_M(sb);
1298 
1299         xfs_restore_resvblks(mp);
1300         xfs_log_work_queue(mp);
1301         return 0;
1302 }
1303 
1304 STATIC int
1305 xfs_fs_show_options(
1306         struct seq_file         *m,
1307         struct dentry           *root)
1308 {
1309         return xfs_showargs(XFS_M(root->d_sb), m);
1310 }
1311 
1312 /*
1313  * This function fills in xfs_mount_t fields based on mount args.
1314  * Note: the superblock _has_ now been read in.
1315  */
1316 STATIC int
1317 xfs_finish_flags(
1318         struct xfs_mount        *mp)
1319 {
1320         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1321 
1322         /* Fail a mount where the logbuf is smaller than the log stripe */
1323         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1324                 if (mp->m_logbsize <= 0 &&
1325                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1326                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1327                 } else if (mp->m_logbsize > 0 &&
1328                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1329                         xfs_warn(mp,
1330                 "logbuf size must be greater than or equal to log stripe size");
1331                         return -EINVAL;
1332                 }
1333         } else {
1334                 /* Fail a mount if the logbuf is larger than 32K */
1335                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1336                         xfs_warn(mp,
1337                 "logbuf size for version 1 logs must be 16K or 32K");
1338                         return -EINVAL;
1339                 }
1340         }
1341 
1342         /*
1343          * V5 filesystems always use attr2 format for attributes.
1344          */
1345         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1346             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1347                 xfs_warn(mp,
1348 "Cannot mount a V5 filesystem as %s. %s is always enabled for V5 filesystems.",
1349                         MNTOPT_NOATTR2, MNTOPT_ATTR2);
1350                 return -EINVAL;
1351         }
1352 
1353         /*
1354          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1355          * told by noattr2 to turn it off
1356          */
1357         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1358             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1359                 mp->m_flags |= XFS_MOUNT_ATTR2;
1360 
1361         /*
1362          * prohibit r/w mounts of read-only filesystems
1363          */
1364         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1365                 xfs_warn(mp,
1366                         "cannot mount a read-only filesystem as read-write");
1367                 return -EROFS;
1368         }
1369 
1370         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1371             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1372             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1373                 xfs_warn(mp,
1374                   "Super block does not support project and group quota together");
1375                 return -EINVAL;
1376         }
1377 
1378         return 0;
1379 }
1380 
1381 static int
1382 xfs_init_percpu_counters(
1383         struct xfs_mount        *mp)
1384 {
1385         int             error;
1386 
1387         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1388         if (error)
1389                 return -ENOMEM;
1390 
1391         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1392         if (error)
1393                 goto free_icount;
1394 
1395         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1396         if (error)
1397                 goto free_ifree;
1398 
1399         return 0;
1400 
1401 free_ifree:
1402         percpu_counter_destroy(&mp->m_ifree);
1403 free_icount:
1404         percpu_counter_destroy(&mp->m_icount);
1405         return -ENOMEM;
1406 }
1407 
1408 void
1409 xfs_reinit_percpu_counters(
1410         struct xfs_mount        *mp)
1411 {
1412         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1413         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1414         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1415 }
1416 
1417 static void
1418 xfs_destroy_percpu_counters(
1419         struct xfs_mount        *mp)
1420 {
1421         percpu_counter_destroy(&mp->m_icount);
1422         percpu_counter_destroy(&mp->m_ifree);
1423         percpu_counter_destroy(&mp->m_fdblocks);
1424 }
1425 
1426 STATIC int
1427 xfs_fs_fill_super(
1428         struct super_block      *sb,
1429         void                    *data,
1430         int                     silent)
1431 {
1432         struct inode            *root;
1433         struct xfs_mount        *mp = NULL;
1434         int                     flags = 0, error = -ENOMEM;
1435 
1436         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1437         if (!mp)
1438                 goto out;
1439 
1440         spin_lock_init(&mp->m_sb_lock);
1441         mutex_init(&mp->m_growlock);
1442         atomic_set(&mp->m_active_trans, 0);
1443         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1444         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1445         mp->m_kobj.kobject.kset = xfs_kset;
1446 
1447         mp->m_super = sb;
1448         sb->s_fs_info = mp;
1449 
1450         error = xfs_parseargs(mp, (char *)data);
1451         if (error)
1452                 goto out_free_fsname;
1453 
1454         sb_min_blocksize(sb, BBSIZE);
1455         sb->s_xattr = xfs_xattr_handlers;
1456         sb->s_export_op = &xfs_export_operations;
1457 #ifdef CONFIG_XFS_QUOTA
1458         sb->s_qcop = &xfs_quotactl_operations;
1459         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1460 #endif
1461         sb->s_op = &xfs_super_operations;
1462 
1463         if (silent)
1464                 flags |= XFS_MFSI_QUIET;
1465 
1466         error = xfs_open_devices(mp);
1467         if (error)
1468                 goto out_free_fsname;
1469 
1470         error = xfs_init_mount_workqueues(mp);
1471         if (error)
1472                 goto out_close_devices;
1473 
1474         error = xfs_init_percpu_counters(mp);
1475         if (error)
1476                 goto out_destroy_workqueues;
1477 
1478         error = xfs_readsb(mp, flags);
1479         if (error)
1480                 goto out_destroy_counters;
1481 
1482         error = xfs_finish_flags(mp);
1483         if (error)
1484                 goto out_free_sb;
1485 
1486         error = xfs_setup_devices(mp);
1487         if (error)
1488                 goto out_free_sb;
1489 
1490         error = xfs_filestream_mount(mp);
1491         if (error)
1492                 goto out_free_sb;
1493 
1494         /*
1495          * we must configure the block size in the superblock before we run the
1496          * full mount process as the mount process can lookup and cache inodes.
1497          */
1498         sb->s_magic = XFS_SB_MAGIC;
1499         sb->s_blocksize = mp->m_sb.sb_blocksize;
1500         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1501         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1502         sb->s_max_links = XFS_MAXLINK;
1503         sb->s_time_gran = 1;
1504         set_posix_acl_flag(sb);
1505 
1506         /* version 5 superblocks support inode version counters. */
1507         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1508                 sb->s_flags |= MS_I_VERSION;
1509 
1510         error = xfs_mountfs(mp);
1511         if (error)
1512                 goto out_filestream_unmount;
1513 
1514         root = igrab(VFS_I(mp->m_rootip));
1515         if (!root) {
1516                 error = -ENOENT;
1517                 goto out_unmount;
1518         }
1519         sb->s_root = d_make_root(root);
1520         if (!sb->s_root) {
1521                 error = -ENOMEM;
1522                 goto out_unmount;
1523         }
1524 
1525         return 0;
1526 
1527  out_filestream_unmount:
1528         xfs_filestream_unmount(mp);
1529  out_free_sb:
1530         xfs_freesb(mp);
1531  out_destroy_counters:
1532         xfs_destroy_percpu_counters(mp);
1533 out_destroy_workqueues:
1534         xfs_destroy_mount_workqueues(mp);
1535  out_close_devices:
1536         xfs_close_devices(mp);
1537  out_free_fsname:
1538         xfs_free_fsname(mp);
1539         kfree(mp);
1540  out:
1541         return error;
1542 
1543  out_unmount:
1544         xfs_filestream_unmount(mp);
1545         xfs_unmountfs(mp);
1546         goto out_free_sb;
1547 }
1548 
1549 STATIC void
1550 xfs_fs_put_super(
1551         struct super_block      *sb)
1552 {
1553         struct xfs_mount        *mp = XFS_M(sb);
1554 
1555         xfs_notice(mp, "Unmounting Filesystem");
1556         xfs_filestream_unmount(mp);
1557         xfs_unmountfs(mp);
1558 
1559         xfs_freesb(mp);
1560         xfs_destroy_percpu_counters(mp);
1561         xfs_destroy_mount_workqueues(mp);
1562         xfs_close_devices(mp);
1563         xfs_free_fsname(mp);
1564         kfree(mp);
1565 }
1566 
1567 STATIC struct dentry *
1568 xfs_fs_mount(
1569         struct file_system_type *fs_type,
1570         int                     flags,
1571         const char              *dev_name,
1572         void                    *data)
1573 {
1574         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1575 }
1576 
1577 static long
1578 xfs_fs_nr_cached_objects(
1579         struct super_block      *sb,
1580         struct shrink_control   *sc)
1581 {
1582         return xfs_reclaim_inodes_count(XFS_M(sb));
1583 }
1584 
1585 static long
1586 xfs_fs_free_cached_objects(
1587         struct super_block      *sb,
1588         struct shrink_control   *sc)
1589 {
1590         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1591 }
1592 
1593 static const struct super_operations xfs_super_operations = {
1594         .alloc_inode            = xfs_fs_alloc_inode,
1595         .destroy_inode          = xfs_fs_destroy_inode,
1596         .evict_inode            = xfs_fs_evict_inode,
1597         .drop_inode             = xfs_fs_drop_inode,
1598         .put_super              = xfs_fs_put_super,
1599         .sync_fs                = xfs_fs_sync_fs,
1600         .freeze_fs              = xfs_fs_freeze,
1601         .unfreeze_fs            = xfs_fs_unfreeze,
1602         .statfs                 = xfs_fs_statfs,
1603         .remount_fs             = xfs_fs_remount,
1604         .show_options           = xfs_fs_show_options,
1605         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1606         .free_cached_objects    = xfs_fs_free_cached_objects,
1607 };
1608 
1609 static struct file_system_type xfs_fs_type = {
1610         .owner                  = THIS_MODULE,
1611         .name                   = "xfs",
1612         .mount                  = xfs_fs_mount,
1613         .kill_sb                = kill_block_super,
1614         .fs_flags               = FS_REQUIRES_DEV,
1615 };
1616 MODULE_ALIAS_FS("xfs");
1617 
1618 STATIC int __init
1619 xfs_init_zones(void)
1620 {
1621 
1622         xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
1623         if (!xfs_ioend_zone)
1624                 goto out;
1625 
1626         xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
1627                                                   xfs_ioend_zone);
1628         if (!xfs_ioend_pool)
1629                 goto out_destroy_ioend_zone;
1630 
1631         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1632                                                 "xfs_log_ticket");
1633         if (!xfs_log_ticket_zone)
1634                 goto out_destroy_ioend_pool;
1635 
1636         xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
1637                                                 "xfs_bmap_free_item");
1638         if (!xfs_bmap_free_item_zone)
1639                 goto out_destroy_log_ticket_zone;
1640 
1641         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1642                                                 "xfs_btree_cur");
1643         if (!xfs_btree_cur_zone)
1644                 goto out_destroy_bmap_free_item_zone;
1645 
1646         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1647                                                 "xfs_da_state");
1648         if (!xfs_da_state_zone)
1649                 goto out_destroy_btree_cur_zone;
1650 
1651         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1652         if (!xfs_ifork_zone)
1653                 goto out_destroy_da_state_zone;
1654 
1655         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1656         if (!xfs_trans_zone)
1657                 goto out_destroy_ifork_zone;
1658 
1659         xfs_log_item_desc_zone =
1660                 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1661                                "xfs_log_item_desc");
1662         if (!xfs_log_item_desc_zone)
1663                 goto out_destroy_trans_zone;
1664 
1665         /*
1666          * The size of the zone allocated buf log item is the maximum
1667          * size possible under XFS.  This wastes a little bit of memory,
1668          * but it is much faster.
1669          */
1670         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1671                                            "xfs_buf_item");
1672         if (!xfs_buf_item_zone)
1673                 goto out_destroy_log_item_desc_zone;
1674 
1675         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1676                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1677                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1678         if (!xfs_efd_zone)
1679                 goto out_destroy_buf_item_zone;
1680 
1681         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1682                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1683                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1684         if (!xfs_efi_zone)
1685                 goto out_destroy_efd_zone;
1686 
1687         xfs_inode_zone =
1688                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1689                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD,
1690                         xfs_fs_inode_init_once);
1691         if (!xfs_inode_zone)
1692                 goto out_destroy_efi_zone;
1693 
1694         xfs_ili_zone =
1695                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1696                                         KM_ZONE_SPREAD, NULL);
1697         if (!xfs_ili_zone)
1698                 goto out_destroy_inode_zone;
1699         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1700                                         "xfs_icr");
1701         if (!xfs_icreate_zone)
1702                 goto out_destroy_ili_zone;
1703 
1704         return 0;
1705 
1706  out_destroy_ili_zone:
1707         kmem_zone_destroy(xfs_ili_zone);
1708  out_destroy_inode_zone:
1709         kmem_zone_destroy(xfs_inode_zone);
1710  out_destroy_efi_zone:
1711         kmem_zone_destroy(xfs_efi_zone);
1712  out_destroy_efd_zone:
1713         kmem_zone_destroy(xfs_efd_zone);
1714  out_destroy_buf_item_zone:
1715         kmem_zone_destroy(xfs_buf_item_zone);
1716  out_destroy_log_item_desc_zone:
1717         kmem_zone_destroy(xfs_log_item_desc_zone);
1718  out_destroy_trans_zone:
1719         kmem_zone_destroy(xfs_trans_zone);
1720  out_destroy_ifork_zone:
1721         kmem_zone_destroy(xfs_ifork_zone);
1722  out_destroy_da_state_zone:
1723         kmem_zone_destroy(xfs_da_state_zone);
1724  out_destroy_btree_cur_zone:
1725         kmem_zone_destroy(xfs_btree_cur_zone);
1726  out_destroy_bmap_free_item_zone:
1727         kmem_zone_destroy(xfs_bmap_free_item_zone);
1728  out_destroy_log_ticket_zone:
1729         kmem_zone_destroy(xfs_log_ticket_zone);
1730  out_destroy_ioend_pool:
1731         mempool_destroy(xfs_ioend_pool);
1732  out_destroy_ioend_zone:
1733         kmem_zone_destroy(xfs_ioend_zone);
1734  out:
1735         return -ENOMEM;
1736 }
1737 
1738 STATIC void
1739 xfs_destroy_zones(void)
1740 {
1741         /*
1742          * Make sure all delayed rcu free are flushed before we
1743          * destroy caches.
1744          */
1745         rcu_barrier();
1746         kmem_zone_destroy(xfs_icreate_zone);
1747         kmem_zone_destroy(xfs_ili_zone);
1748         kmem_zone_destroy(xfs_inode_zone);
1749         kmem_zone_destroy(xfs_efi_zone);
1750         kmem_zone_destroy(xfs_efd_zone);
1751         kmem_zone_destroy(xfs_buf_item_zone);
1752         kmem_zone_destroy(xfs_log_item_desc_zone);
1753         kmem_zone_destroy(xfs_trans_zone);
1754         kmem_zone_destroy(xfs_ifork_zone);
1755         kmem_zone_destroy(xfs_da_state_zone);
1756         kmem_zone_destroy(xfs_btree_cur_zone);
1757         kmem_zone_destroy(xfs_bmap_free_item_zone);
1758         kmem_zone_destroy(xfs_log_ticket_zone);
1759         mempool_destroy(xfs_ioend_pool);
1760         kmem_zone_destroy(xfs_ioend_zone);
1761 
1762 }
1763 
1764 STATIC int __init
1765 xfs_init_workqueues(void)
1766 {
1767         /*
1768          * The allocation workqueue can be used in memory reclaim situations
1769          * (writepage path), and parallelism is only limited by the number of
1770          * AGs in all the filesystems mounted. Hence use the default large
1771          * max_active value for this workqueue.
1772          */
1773         xfs_alloc_wq = alloc_workqueue("xfsalloc",
1774                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
1775         if (!xfs_alloc_wq)
1776                 return -ENOMEM;
1777 
1778         return 0;
1779 }
1780 
1781 STATIC void
1782 xfs_destroy_workqueues(void)
1783 {
1784         destroy_workqueue(xfs_alloc_wq);
1785 }
1786 
1787 STATIC int __init
1788 init_xfs_fs(void)
1789 {
1790         int                     error;
1791 
1792         printk(KERN_INFO XFS_VERSION_STRING " with "
1793                          XFS_BUILD_OPTIONS " enabled\n");
1794 
1795         xfs_dir_startup();
1796 
1797         error = xfs_init_zones();
1798         if (error)
1799                 goto out;
1800 
1801         error = xfs_init_workqueues();
1802         if (error)
1803                 goto out_destroy_zones;
1804 
1805         error = xfs_mru_cache_init();
1806         if (error)
1807                 goto out_destroy_wq;
1808 
1809         error = xfs_buf_init();
1810         if (error)
1811                 goto out_mru_cache_uninit;
1812 
1813         error = xfs_init_procfs();
1814         if (error)
1815                 goto out_buf_terminate;
1816 
1817         error = xfs_sysctl_register();
1818         if (error)
1819                 goto out_cleanup_procfs;
1820 
1821         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
1822         if (!xfs_kset) {
1823                 error = -ENOMEM;
1824                 goto out_sysctl_unregister;;
1825         }
1826 
1827 #ifdef DEBUG
1828         xfs_dbg_kobj.kobject.kset = xfs_kset;
1829         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
1830         if (error)
1831                 goto out_kset_unregister;
1832 #endif
1833 
1834         error = xfs_qm_init();
1835         if (error)
1836                 goto out_remove_kobj;
1837 
1838         error = register_filesystem(&xfs_fs_type);
1839         if (error)
1840                 goto out_qm_exit;
1841         return 0;
1842 
1843  out_qm_exit:
1844         xfs_qm_exit();
1845  out_remove_kobj:
1846 #ifdef DEBUG
1847         xfs_sysfs_del(&xfs_dbg_kobj);
1848  out_kset_unregister:
1849 #endif
1850         kset_unregister(xfs_kset);
1851  out_sysctl_unregister:
1852         xfs_sysctl_unregister();
1853  out_cleanup_procfs:
1854         xfs_cleanup_procfs();
1855  out_buf_terminate:
1856         xfs_buf_terminate();
1857  out_mru_cache_uninit:
1858         xfs_mru_cache_uninit();
1859  out_destroy_wq:
1860         xfs_destroy_workqueues();
1861  out_destroy_zones:
1862         xfs_destroy_zones();
1863  out:
1864         return error;
1865 }
1866 
1867 STATIC void __exit
1868 exit_xfs_fs(void)
1869 {
1870         xfs_qm_exit();
1871         unregister_filesystem(&xfs_fs_type);
1872 #ifdef DEBUG
1873         xfs_sysfs_del(&xfs_dbg_kobj);
1874 #endif
1875         kset_unregister(xfs_kset);
1876         xfs_sysctl_unregister();
1877         xfs_cleanup_procfs();
1878         xfs_buf_terminate();
1879         xfs_mru_cache_uninit();
1880         xfs_destroy_workqueues();
1881         xfs_destroy_zones();
1882 }
1883 
1884 module_init(init_xfs_fs);
1885 module_exit(exit_xfs_fs);
1886 
1887 MODULE_AUTHOR("Silicon Graphics, Inc.");
1888 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
1889 MODULE_LICENSE("GPL");
1890 

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