Version:  2.0.40 2.2.26 2.4.37 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 4.2 4.3 4.4 4.5 4.6

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 #include "xfs_ondisk.h"
 49 
 50 #include <linux/namei.h>
 51 #include <linux/init.h>
 52 #include <linux/slab.h>
 53 #include <linux/mount.h>
 54 #include <linux/mempool.h>
 55 #include <linux/writeback.h>
 56 #include <linux/kthread.h>
 57 #include <linux/freezer.h>
 58 #include <linux/parser.h>
 59 
 60 static const struct super_operations xfs_super_operations;
 61 static kmem_zone_t *xfs_ioend_zone;
 62 mempool_t *xfs_ioend_pool;
 63 
 64 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
 65 #ifdef DEBUG
 66 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
 67 #endif
 68 
 69 /*
 70  * Table driven mount option parser.
 71  */
 72 enum {
 73         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev, Opt_biosize,
 74         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
 75         Opt_mtpt, Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
 76         Opt_allocsize, Opt_norecovery, Opt_barrier, Opt_nobarrier,
 77         Opt_inode64, Opt_inode32, Opt_ikeep, Opt_noikeep,
 78         Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2, Opt_filestreams,
 79         Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota, Opt_prjquota,
 80         Opt_uquota, Opt_gquota, Opt_pquota,
 81         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
 82         Opt_discard, Opt_nodiscard, Opt_dax, Opt_err,
 83 };
 84 
 85 static const match_table_t tokens = {
 86         {Opt_logbufs,   "logbufs=%u"},  /* number of XFS log buffers */
 87         {Opt_logbsize,  "logbsize=%s"}, /* size of XFS log buffers */
 88         {Opt_logdev,    "logdev=%s"},   /* log device */
 89         {Opt_rtdev,     "rtdev=%s"},    /* realtime I/O device */
 90         {Opt_biosize,   "biosize=%u"},  /* log2 of preferred buffered io size */
 91         {Opt_wsync,     "wsync"},       /* safe-mode nfs compatible mount */
 92         {Opt_noalign,   "noalign"},     /* turn off stripe alignment */
 93         {Opt_swalloc,   "swalloc"},     /* turn on stripe width allocation */
 94         {Opt_sunit,     "sunit=%u"},    /* data volume stripe unit */
 95         {Opt_swidth,    "swidth=%u"},   /* data volume stripe width */
 96         {Opt_nouuid,    "nouuid"},      /* ignore filesystem UUID */
 97         {Opt_mtpt,      "mtpt"},        /* filesystem mount point */
 98         {Opt_grpid,     "grpid"},       /* group-ID from parent directory */
 99         {Opt_nogrpid,   "nogrpid"},     /* group-ID from current process */
100         {Opt_bsdgroups, "bsdgroups"},   /* group-ID from parent directory */
101         {Opt_sysvgroups,"sysvgroups"},  /* group-ID from current process */
102         {Opt_allocsize, "allocsize=%s"},/* preferred allocation size */
103         {Opt_norecovery,"norecovery"},  /* don't run XFS recovery */
104         {Opt_barrier,   "barrier"},     /* use writer barriers for log write and
105                                          * unwritten extent conversion */
106         {Opt_nobarrier, "nobarrier"},   /* .. disable */
107         {Opt_inode64,   "inode64"},     /* inodes can be allocated anywhere */
108         {Opt_inode32,   "inode32"},     /* inode allocation limited to
109                                          * XFS_MAXINUMBER_32 */
110         {Opt_ikeep,     "ikeep"},       /* do not free empty inode clusters */
111         {Opt_noikeep,   "noikeep"},     /* free empty inode clusters */
112         {Opt_largeio,   "largeio"},     /* report large I/O sizes in stat() */
113         {Opt_nolargeio, "nolargeio"},   /* do not report large I/O sizes
114                                          * in stat(). */
115         {Opt_attr2,     "attr2"},       /* do use attr2 attribute format */
116         {Opt_noattr2,   "noattr2"},     /* do not use attr2 attribute format */
117         {Opt_filestreams,"filestreams"},/* use filestreams allocator */
118         {Opt_quota,     "quota"},       /* disk quotas (user) */
119         {Opt_noquota,   "noquota"},     /* no quotas */
120         {Opt_usrquota,  "usrquota"},    /* user quota enabled */
121         {Opt_grpquota,  "grpquota"},    /* group quota enabled */
122         {Opt_prjquota,  "prjquota"},    /* project quota enabled */
123         {Opt_uquota,    "uquota"},      /* user quota (IRIX variant) */
124         {Opt_gquota,    "gquota"},      /* group quota (IRIX variant) */
125         {Opt_pquota,    "pquota"},      /* project quota (IRIX variant) */
126         {Opt_uqnoenforce,"uqnoenforce"},/* user quota limit enforcement */
127         {Opt_gqnoenforce,"gqnoenforce"},/* group quota limit enforcement */
128         {Opt_pqnoenforce,"pqnoenforce"},/* project quota limit enforcement */
129         {Opt_qnoenforce, "qnoenforce"}, /* same as uqnoenforce */
130         {Opt_discard,   "discard"},     /* Discard unused blocks */
131         {Opt_nodiscard, "nodiscard"},   /* Do not discard unused blocks */
132 
133         {Opt_dax,       "dax"},         /* Enable direct access to bdev pages */
134         {Opt_err,       NULL},
135 };
136 
137 
138 STATIC int
139 suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
140 {
141         int     last, shift_left_factor = 0, _res;
142         char    *value;
143         int     ret = 0;
144 
145         value = match_strdup(s);
146         if (!value)
147                 return -ENOMEM;
148 
149         last = strlen(value) - 1;
150         if (value[last] == 'K' || value[last] == 'k') {
151                 shift_left_factor = 10;
152                 value[last] = '\0';
153         }
154         if (value[last] == 'M' || value[last] == 'm') {
155                 shift_left_factor = 20;
156                 value[last] = '\0';
157         }
158         if (value[last] == 'G' || value[last] == 'g') {
159                 shift_left_factor = 30;
160                 value[last] = '\0';
161         }
162 
163         if (kstrtoint(value, base, &_res))
164                 ret = -EINVAL;
165         kfree(value);
166         *res = _res << shift_left_factor;
167         return ret;
168 }
169 
170 /*
171  * This function fills in xfs_mount_t fields based on mount args.
172  * Note: the superblock has _not_ yet been read in.
173  *
174  * Note that this function leaks the various device name allocations on
175  * failure.  The caller takes care of them.
176  *
177  * *sb is const because this is also used to test options on the remount
178  * path, and we don't want this to have any side effects at remount time.
179  * Today this function does not change *sb, but just to future-proof...
180  */
181 STATIC int
182 xfs_parseargs(
183         struct xfs_mount        *mp,
184         char                    *options)
185 {
186         const struct super_block *sb = mp->m_super;
187         char                    *p;
188         substring_t             args[MAX_OPT_ARGS];
189         int                     dsunit = 0;
190         int                     dswidth = 0;
191         int                     iosize = 0;
192         __uint8_t               iosizelog = 0;
193 
194         /*
195          * set up the mount name first so all the errors will refer to the
196          * correct device.
197          */
198         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
199         if (!mp->m_fsname)
200                 return -ENOMEM;
201         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
202 
203         /*
204          * Copy binary VFS mount flags we are interested in.
205          */
206         if (sb->s_flags & MS_RDONLY)
207                 mp->m_flags |= XFS_MOUNT_RDONLY;
208         if (sb->s_flags & MS_DIRSYNC)
209                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
210         if (sb->s_flags & MS_SYNCHRONOUS)
211                 mp->m_flags |= XFS_MOUNT_WSYNC;
212 
213         /*
214          * Set some default flags that could be cleared by the mount option
215          * parsing.
216          */
217         mp->m_flags |= XFS_MOUNT_BARRIER;
218         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
219 
220         /*
221          * These can be overridden by the mount option parsing.
222          */
223         mp->m_logbufs = -1;
224         mp->m_logbsize = -1;
225 
226         if (!options)
227                 goto done;
228 
229         while ((p = strsep(&options, ",")) != NULL) {
230                 int             token;
231 
232                 if (!*p)
233                         continue;
234 
235                 token = match_token(p, tokens, args);
236                 switch (token) {
237                 case Opt_logbufs:
238                         if (match_int(args, &mp->m_logbufs))
239                                 return -EINVAL;
240                         break;
241                 case Opt_logbsize:
242                         if (suffix_kstrtoint(args, 10, &mp->m_logbsize))
243                                 return -EINVAL;
244                         break;
245                 case Opt_logdev:
246                         mp->m_logname = match_strdup(args);
247                         if (!mp->m_logname)
248                                 return -ENOMEM;
249                         break;
250                 case Opt_mtpt:
251                         xfs_warn(mp, "%s option not allowed on this system", p);
252                         return -EINVAL;
253                 case Opt_rtdev:
254                         mp->m_rtname = match_strdup(args);
255                         if (!mp->m_rtname)
256                                 return -ENOMEM;
257                         break;
258                 case Opt_allocsize:
259                 case Opt_biosize:
260                         if (suffix_kstrtoint(args, 10, &iosize))
261                                 return -EINVAL;
262                         iosizelog = ffs(iosize) - 1;
263                         break;
264                 case Opt_grpid:
265                 case Opt_bsdgroups:
266                         mp->m_flags |= XFS_MOUNT_GRPID;
267                         break;
268                 case Opt_nogrpid:
269                 case Opt_sysvgroups:
270                         mp->m_flags &= ~XFS_MOUNT_GRPID;
271                         break;
272                 case Opt_wsync:
273                         mp->m_flags |= XFS_MOUNT_WSYNC;
274                         break;
275                 case Opt_norecovery:
276                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
277                         break;
278                 case Opt_noalign:
279                         mp->m_flags |= XFS_MOUNT_NOALIGN;
280                         break;
281                 case Opt_swalloc:
282                         mp->m_flags |= XFS_MOUNT_SWALLOC;
283                         break;
284                 case Opt_sunit:
285                         if (match_int(args, &dsunit))
286                                 return -EINVAL;
287                         break;
288                 case Opt_swidth:
289                         if (match_int(args, &dswidth))
290                                 return -EINVAL;
291                         break;
292                 case Opt_inode32:
293                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
294                         break;
295                 case Opt_inode64:
296                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
297                         break;
298                 case Opt_nouuid:
299                         mp->m_flags |= XFS_MOUNT_NOUUID;
300                         break;
301                 case Opt_barrier:
302                         mp->m_flags |= XFS_MOUNT_BARRIER;
303                         break;
304                 case Opt_nobarrier:
305                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
306                         break;
307                 case Opt_ikeep:
308                         mp->m_flags |= XFS_MOUNT_IKEEP;
309                         break;
310                 case Opt_noikeep:
311                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
312                         break;
313                 case Opt_largeio:
314                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
315                         break;
316                 case Opt_nolargeio:
317                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
318                         break;
319                 case Opt_attr2:
320                         mp->m_flags |= XFS_MOUNT_ATTR2;
321                         break;
322                 case Opt_noattr2:
323                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
324                         mp->m_flags |= XFS_MOUNT_NOATTR2;
325                         break;
326                 case Opt_filestreams:
327                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
328                         break;
329                 case Opt_noquota:
330                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
331                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
332                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
333                         break;
334                 case Opt_quota:
335                 case Opt_uquota:
336                 case Opt_usrquota:
337                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
338                                          XFS_UQUOTA_ENFD);
339                         break;
340                 case Opt_qnoenforce:
341                 case Opt_uqnoenforce:
342                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
343                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
344                         break;
345                 case Opt_pquota:
346                 case Opt_prjquota:
347                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
348                                          XFS_PQUOTA_ENFD);
349                         break;
350                 case Opt_pqnoenforce:
351                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
352                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
353                 case Opt_gquota:
354                 case Opt_grpquota:
355                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
356                                          XFS_GQUOTA_ENFD);
357                         break;
358                 case Opt_gqnoenforce:
359                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
360                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
361                         break;
362                 case Opt_discard:
363                         mp->m_flags |= XFS_MOUNT_DISCARD;
364                         break;
365                 case Opt_nodiscard:
366                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
367                         break;
368 #ifdef CONFIG_FS_DAX
369                 case Opt_dax:
370                         mp->m_flags |= XFS_MOUNT_DAX;
371                         break;
372 #endif
373                 default:
374                         xfs_warn(mp, "unknown mount option [%s].", p);
375                         return -EINVAL;
376                 }
377         }
378 
379         /*
380          * no recovery flag requires a read-only mount
381          */
382         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
383             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
384                 xfs_warn(mp, "no-recovery mounts must be read-only.");
385                 return -EINVAL;
386         }
387 
388         if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
389                 xfs_warn(mp,
390         "sunit and swidth options incompatible with the noalign option");
391                 return -EINVAL;
392         }
393 
394 #ifndef CONFIG_XFS_QUOTA
395         if (XFS_IS_QUOTA_RUNNING(mp)) {
396                 xfs_warn(mp, "quota support not available in this kernel.");
397                 return -EINVAL;
398         }
399 #endif
400 
401         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
402                 xfs_warn(mp, "sunit and swidth must be specified together");
403                 return -EINVAL;
404         }
405 
406         if (dsunit && (dswidth % dsunit != 0)) {
407                 xfs_warn(mp,
408         "stripe width (%d) must be a multiple of the stripe unit (%d)",
409                         dswidth, dsunit);
410                 return -EINVAL;
411         }
412 
413 done:
414         if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
415                 /*
416                  * At this point the superblock has not been read
417                  * in, therefore we do not know the block size.
418                  * Before the mount call ends we will convert
419                  * these to FSBs.
420                  */
421                 mp->m_dalign = dsunit;
422                 mp->m_swidth = dswidth;
423         }
424 
425         if (mp->m_logbufs != -1 &&
426             mp->m_logbufs != 0 &&
427             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
428              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
429                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
430                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
431                 return -EINVAL;
432         }
433         if (mp->m_logbsize != -1 &&
434             mp->m_logbsize !=  0 &&
435             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
436              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
437              !is_power_of_2(mp->m_logbsize))) {
438                 xfs_warn(mp,
439                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
440                         mp->m_logbsize);
441                 return -EINVAL;
442         }
443 
444         if (iosizelog) {
445                 if (iosizelog > XFS_MAX_IO_LOG ||
446                     iosizelog < XFS_MIN_IO_LOG) {
447                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
448                                 iosizelog, XFS_MIN_IO_LOG,
449                                 XFS_MAX_IO_LOG);
450                         return -EINVAL;
451                 }
452 
453                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
454                 mp->m_readio_log = iosizelog;
455                 mp->m_writeio_log = iosizelog;
456         }
457 
458         return 0;
459 }
460 
461 struct proc_xfs_info {
462         uint64_t        flag;
463         char            *str;
464 };
465 
466 STATIC int
467 xfs_showargs(
468         struct xfs_mount        *mp,
469         struct seq_file         *m)
470 {
471         static struct proc_xfs_info xfs_info_set[] = {
472                 /* the few simple ones we can get from the mount struct */
473                 { XFS_MOUNT_IKEEP,              ",ikeep" },
474                 { XFS_MOUNT_WSYNC,              ",wsync" },
475                 { XFS_MOUNT_NOALIGN,            ",noalign" },
476                 { XFS_MOUNT_SWALLOC,            ",swalloc" },
477                 { XFS_MOUNT_NOUUID,             ",nouuid" },
478                 { XFS_MOUNT_NORECOVERY,         ",norecovery" },
479                 { XFS_MOUNT_ATTR2,              ",attr2" },
480                 { XFS_MOUNT_FILESTREAMS,        ",filestreams" },
481                 { XFS_MOUNT_GRPID,              ",grpid" },
482                 { XFS_MOUNT_DISCARD,            ",discard" },
483                 { XFS_MOUNT_SMALL_INUMS,        ",inode32" },
484                 { XFS_MOUNT_DAX,                ",dax" },
485                 { 0, NULL }
486         };
487         static struct proc_xfs_info xfs_info_unset[] = {
488                 /* the few simple ones we can get from the mount struct */
489                 { XFS_MOUNT_COMPAT_IOSIZE,      ",largeio" },
490                 { XFS_MOUNT_BARRIER,            ",nobarrier" },
491                 { XFS_MOUNT_SMALL_INUMS,        ",inode64" },
492                 { 0, NULL }
493         };
494         struct proc_xfs_info    *xfs_infop;
495 
496         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
497                 if (mp->m_flags & xfs_infop->flag)
498                         seq_puts(m, xfs_infop->str);
499         }
500         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
501                 if (!(mp->m_flags & xfs_infop->flag))
502                         seq_puts(m, xfs_infop->str);
503         }
504 
505         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
506                 seq_printf(m, ",allocsize=%dk",
507                                 (int)(1 << mp->m_writeio_log) >> 10);
508 
509         if (mp->m_logbufs > 0)
510                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
511         if (mp->m_logbsize > 0)
512                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
513 
514         if (mp->m_logname)
515                 seq_show_option(m, "logdev", mp->m_logname);
516         if (mp->m_rtname)
517                 seq_show_option(m, "rtdev", mp->m_rtname);
518 
519         if (mp->m_dalign > 0)
520                 seq_printf(m, ",sunit=%d",
521                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
522         if (mp->m_swidth > 0)
523                 seq_printf(m, ",swidth=%d",
524                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
525 
526         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
527                 seq_puts(m, ",usrquota");
528         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
529                 seq_puts(m, ",uqnoenforce");
530 
531         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
532                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
533                         seq_puts(m, ",prjquota");
534                 else
535                         seq_puts(m, ",pqnoenforce");
536         }
537         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
538                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
539                         seq_puts(m, ",grpquota");
540                 else
541                         seq_puts(m, ",gqnoenforce");
542         }
543 
544         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
545                 seq_puts(m, ",noquota");
546 
547         return 0;
548 }
549 __uint64_t
550 xfs_max_file_offset(
551         unsigned int            blockshift)
552 {
553         unsigned int            pagefactor = 1;
554         unsigned int            bitshift = BITS_PER_LONG - 1;
555 
556         /* Figure out maximum filesize, on Linux this can depend on
557          * the filesystem blocksize (on 32 bit platforms).
558          * __block_write_begin does this in an [unsigned] long...
559          *      page->index << (PAGE_SHIFT - bbits)
560          * So, for page sized blocks (4K on 32 bit platforms),
561          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
562          *      (((u64)PAGE_SIZE << (BITS_PER_LONG-1))-1)
563          * but for smaller blocksizes it is less (bbits = log2 bsize).
564          * Note1: get_block_t takes a long (implicit cast from above)
565          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
566          * can optionally convert the [unsigned] long from above into
567          * an [unsigned] long long.
568          */
569 
570 #if BITS_PER_LONG == 32
571 # if defined(CONFIG_LBDAF)
572         ASSERT(sizeof(sector_t) == 8);
573         pagefactor = PAGE_SIZE;
574         bitshift = BITS_PER_LONG;
575 # else
576         pagefactor = PAGE_SIZE >> (PAGE_SHIFT - blockshift);
577 # endif
578 #endif
579 
580         return (((__uint64_t)pagefactor) << bitshift) - 1;
581 }
582 
583 /*
584  * Set parameters for inode allocation heuristics, taking into account
585  * filesystem size and inode32/inode64 mount options; i.e. specifically
586  * whether or not XFS_MOUNT_SMALL_INUMS is set.
587  *
588  * Inode allocation patterns are altered only if inode32 is requested
589  * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
590  * If altered, XFS_MOUNT_32BITINODES is set as well.
591  *
592  * An agcount independent of that in the mount structure is provided
593  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
594  * to the potentially higher ag count.
595  *
596  * Returns the maximum AG index which may contain inodes.
597  */
598 xfs_agnumber_t
599 xfs_set_inode_alloc(
600         struct xfs_mount *mp,
601         xfs_agnumber_t  agcount)
602 {
603         xfs_agnumber_t  index;
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 
610         /*
611          * Calculate how much should be reserved for inodes to meet
612          * the max inode percentage.  Used only for inode32.
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         /* Get the last possible inode in the filesystem */
627         agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
628         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
629 
630         /*
631          * If user asked for no more than 32-bit inodes, and the fs is
632          * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
633          * the allocator to accommodate the request.
634          */
635         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
636                 mp->m_flags |= XFS_MOUNT_32BITINODES;
637         else
638                 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
639 
640         for (index = 0; index < agcount; index++) {
641                 struct xfs_perag        *pag;
642 
643                 ino = XFS_AGINO_TO_INO(mp, index, agino);
644 
645                 pag = xfs_perag_get(mp, index);
646 
647                 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
648                         if (ino > XFS_MAXINUMBER_32) {
649                                 pag->pagi_inodeok = 0;
650                                 pag->pagf_metadata = 0;
651                         } else {
652                                 pag->pagi_inodeok = 1;
653                                 maxagi++;
654                                 if (index < max_metadata)
655                                         pag->pagf_metadata = 1;
656                                 else
657                                         pag->pagf_metadata = 0;
658                         }
659                 } else {
660                         pag->pagi_inodeok = 1;
661                         pag->pagf_metadata = 0;
662                 }
663 
664                 xfs_perag_put(pag);
665         }
666 
667         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
668 }
669 
670 STATIC int
671 xfs_blkdev_get(
672         xfs_mount_t             *mp,
673         const char              *name,
674         struct block_device     **bdevp)
675 {
676         int                     error = 0;
677 
678         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
679                                     mp);
680         if (IS_ERR(*bdevp)) {
681                 error = PTR_ERR(*bdevp);
682                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
683         }
684 
685         return error;
686 }
687 
688 STATIC void
689 xfs_blkdev_put(
690         struct block_device     *bdev)
691 {
692         if (bdev)
693                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
694 }
695 
696 void
697 xfs_blkdev_issue_flush(
698         xfs_buftarg_t           *buftarg)
699 {
700         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
701 }
702 
703 STATIC void
704 xfs_close_devices(
705         struct xfs_mount        *mp)
706 {
707         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
708                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
709                 xfs_free_buftarg(mp, mp->m_logdev_targp);
710                 xfs_blkdev_put(logdev);
711         }
712         if (mp->m_rtdev_targp) {
713                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
714                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
715                 xfs_blkdev_put(rtdev);
716         }
717         xfs_free_buftarg(mp, mp->m_ddev_targp);
718 }
719 
720 /*
721  * The file system configurations are:
722  *      (1) device (partition) with data and internal log
723  *      (2) logical volume with data and log subvolumes.
724  *      (3) logical volume with data, log, and realtime subvolumes.
725  *
726  * We only have to handle opening the log and realtime volumes here if
727  * they are present.  The data subvolume has already been opened by
728  * get_sb_bdev() and is stored in sb->s_bdev.
729  */
730 STATIC int
731 xfs_open_devices(
732         struct xfs_mount        *mp)
733 {
734         struct block_device     *ddev = mp->m_super->s_bdev;
735         struct block_device     *logdev = NULL, *rtdev = NULL;
736         int                     error;
737 
738         /*
739          * Open real time and log devices - order is important.
740          */
741         if (mp->m_logname) {
742                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
743                 if (error)
744                         goto out;
745         }
746 
747         if (mp->m_rtname) {
748                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
749                 if (error)
750                         goto out_close_logdev;
751 
752                 if (rtdev == ddev || rtdev == logdev) {
753                         xfs_warn(mp,
754         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
755                         error = -EINVAL;
756                         goto out_close_rtdev;
757                 }
758         }
759 
760         /*
761          * Setup xfs_mount buffer target pointers
762          */
763         error = -ENOMEM;
764         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev);
765         if (!mp->m_ddev_targp)
766                 goto out_close_rtdev;
767 
768         if (rtdev) {
769                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev);
770                 if (!mp->m_rtdev_targp)
771                         goto out_free_ddev_targ;
772         }
773 
774         if (logdev && logdev != ddev) {
775                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
776                 if (!mp->m_logdev_targp)
777                         goto out_free_rtdev_targ;
778         } else {
779                 mp->m_logdev_targp = mp->m_ddev_targp;
780         }
781 
782         return 0;
783 
784  out_free_rtdev_targ:
785         if (mp->m_rtdev_targp)
786                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
787  out_free_ddev_targ:
788         xfs_free_buftarg(mp, mp->m_ddev_targp);
789  out_close_rtdev:
790         xfs_blkdev_put(rtdev);
791  out_close_logdev:
792         if (logdev && logdev != ddev)
793                 xfs_blkdev_put(logdev);
794  out:
795         return error;
796 }
797 
798 /*
799  * Setup xfs_mount buffer target pointers based on superblock
800  */
801 STATIC int
802 xfs_setup_devices(
803         struct xfs_mount        *mp)
804 {
805         int                     error;
806 
807         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
808         if (error)
809                 return error;
810 
811         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
812                 unsigned int    log_sector_size = BBSIZE;
813 
814                 if (xfs_sb_version_hassector(&mp->m_sb))
815                         log_sector_size = mp->m_sb.sb_logsectsize;
816                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
817                                             log_sector_size);
818                 if (error)
819                         return error;
820         }
821         if (mp->m_rtdev_targp) {
822                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
823                                             mp->m_sb.sb_sectsize);
824                 if (error)
825                         return error;
826         }
827 
828         return 0;
829 }
830 
831 STATIC int
832 xfs_init_mount_workqueues(
833         struct xfs_mount        *mp)
834 {
835         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
836                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
837         if (!mp->m_buf_workqueue)
838                 goto out;
839 
840         mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
841                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
842         if (!mp->m_data_workqueue)
843                 goto out_destroy_buf;
844 
845         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
846                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
847         if (!mp->m_unwritten_workqueue)
848                 goto out_destroy_data_iodone_queue;
849 
850         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
851                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
852         if (!mp->m_cil_workqueue)
853                 goto out_destroy_unwritten;
854 
855         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
856                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
857         if (!mp->m_reclaim_workqueue)
858                 goto out_destroy_cil;
859 
860         mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
861                         WQ_MEM_RECLAIM|WQ_FREEZABLE|WQ_HIGHPRI, 0,
862                         mp->m_fsname);
863         if (!mp->m_log_workqueue)
864                 goto out_destroy_reclaim;
865 
866         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
867                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
868         if (!mp->m_eofblocks_workqueue)
869                 goto out_destroy_log;
870 
871         return 0;
872 
873 out_destroy_log:
874         destroy_workqueue(mp->m_log_workqueue);
875 out_destroy_reclaim:
876         destroy_workqueue(mp->m_reclaim_workqueue);
877 out_destroy_cil:
878         destroy_workqueue(mp->m_cil_workqueue);
879 out_destroy_unwritten:
880         destroy_workqueue(mp->m_unwritten_workqueue);
881 out_destroy_data_iodone_queue:
882         destroy_workqueue(mp->m_data_workqueue);
883 out_destroy_buf:
884         destroy_workqueue(mp->m_buf_workqueue);
885 out:
886         return -ENOMEM;
887 }
888 
889 STATIC void
890 xfs_destroy_mount_workqueues(
891         struct xfs_mount        *mp)
892 {
893         destroy_workqueue(mp->m_eofblocks_workqueue);
894         destroy_workqueue(mp->m_log_workqueue);
895         destroy_workqueue(mp->m_reclaim_workqueue);
896         destroy_workqueue(mp->m_cil_workqueue);
897         destroy_workqueue(mp->m_data_workqueue);
898         destroy_workqueue(mp->m_unwritten_workqueue);
899         destroy_workqueue(mp->m_buf_workqueue);
900 }
901 
902 /*
903  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
904  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
905  * for IO to complete so that we effectively throttle multiple callers to the
906  * rate at which IO is completing.
907  */
908 void
909 xfs_flush_inodes(
910         struct xfs_mount        *mp)
911 {
912         struct super_block      *sb = mp->m_super;
913 
914         if (down_read_trylock(&sb->s_umount)) {
915                 sync_inodes_sb(sb);
916                 up_read(&sb->s_umount);
917         }
918 }
919 
920 /* Catch misguided souls that try to use this interface on XFS */
921 STATIC struct inode *
922 xfs_fs_alloc_inode(
923         struct super_block      *sb)
924 {
925         BUG();
926         return NULL;
927 }
928 
929 /*
930  * Now that the generic code is guaranteed not to be accessing
931  * the linux inode, we can reclaim the inode.
932  */
933 STATIC void
934 xfs_fs_destroy_inode(
935         struct inode            *inode)
936 {
937         struct xfs_inode        *ip = XFS_I(inode);
938 
939         trace_xfs_destroy_inode(ip);
940 
941         XFS_STATS_INC(ip->i_mount, vn_reclaim);
942 
943         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
944 
945         /*
946          * We should never get here with one of the reclaim flags already set.
947          */
948         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
949         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
950 
951         /*
952          * We always use background reclaim here because even if the
953          * inode is clean, it still may be under IO and hence we have
954          * to take the flush lock. The background reclaim path handles
955          * this more efficiently than we can here, so simply let background
956          * reclaim tear down all inodes.
957          */
958         xfs_inode_set_reclaim_tag(ip);
959 }
960 
961 /*
962  * Slab object creation initialisation for the XFS inode.
963  * This covers only the idempotent fields in the XFS inode;
964  * all other fields need to be initialised on allocation
965  * from the slab. This avoids the need to repeatedly initialise
966  * fields in the xfs inode that left in the initialise state
967  * when freeing the inode.
968  */
969 STATIC void
970 xfs_fs_inode_init_once(
971         void                    *inode)
972 {
973         struct xfs_inode        *ip = inode;
974 
975         memset(ip, 0, sizeof(struct xfs_inode));
976 
977         /* vfs inode */
978         inode_init_once(VFS_I(ip));
979 
980         /* xfs inode */
981         atomic_set(&ip->i_pincount, 0);
982         spin_lock_init(&ip->i_flags_lock);
983 
984         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
985                      "xfsino", ip->i_ino);
986         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
987                      "xfsino", ip->i_ino);
988 }
989 
990 STATIC void
991 xfs_fs_evict_inode(
992         struct inode            *inode)
993 {
994         xfs_inode_t             *ip = XFS_I(inode);
995 
996         ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
997 
998         trace_xfs_evict_inode(ip);
999 
1000         truncate_inode_pages_final(&inode->i_data);
1001         clear_inode(inode);
1002         XFS_STATS_INC(ip->i_mount, vn_rele);
1003         XFS_STATS_INC(ip->i_mount, vn_remove);
1004 
1005         xfs_inactive(ip);
1006 }
1007 
1008 /*
1009  * We do an unlocked check for XFS_IDONTCACHE here because we are already
1010  * serialised against cache hits here via the inode->i_lock and igrab() in
1011  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
1012  * racing with us, and it avoids needing to grab a spinlock here for every inode
1013  * we drop the final reference on.
1014  */
1015 STATIC int
1016 xfs_fs_drop_inode(
1017         struct inode            *inode)
1018 {
1019         struct xfs_inode        *ip = XFS_I(inode);
1020 
1021         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1022 }
1023 
1024 STATIC void
1025 xfs_free_fsname(
1026         struct xfs_mount        *mp)
1027 {
1028         kfree(mp->m_fsname);
1029         kfree(mp->m_rtname);
1030         kfree(mp->m_logname);
1031 }
1032 
1033 STATIC int
1034 xfs_fs_sync_fs(
1035         struct super_block      *sb,
1036         int                     wait)
1037 {
1038         struct xfs_mount        *mp = XFS_M(sb);
1039 
1040         /*
1041          * Doing anything during the async pass would be counterproductive.
1042          */
1043         if (!wait)
1044                 return 0;
1045 
1046         xfs_log_force(mp, XFS_LOG_SYNC);
1047         if (laptop_mode) {
1048                 /*
1049                  * The disk must be active because we're syncing.
1050                  * We schedule log work now (now that the disk is
1051                  * active) instead of later (when it might not be).
1052                  */
1053                 flush_delayed_work(&mp->m_log->l_work);
1054         }
1055 
1056         return 0;
1057 }
1058 
1059 STATIC int
1060 xfs_fs_statfs(
1061         struct dentry           *dentry,
1062         struct kstatfs          *statp)
1063 {
1064         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1065         xfs_sb_t                *sbp = &mp->m_sb;
1066         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
1067         __uint64_t              fakeinos, id;
1068         __uint64_t              icount;
1069         __uint64_t              ifree;
1070         __uint64_t              fdblocks;
1071         xfs_extlen_t            lsize;
1072         __int64_t               ffree;
1073 
1074         statp->f_type = XFS_SB_MAGIC;
1075         statp->f_namelen = MAXNAMELEN - 1;
1076 
1077         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1078         statp->f_fsid.val[0] = (u32)id;
1079         statp->f_fsid.val[1] = (u32)(id >> 32);
1080 
1081         icount = percpu_counter_sum(&mp->m_icount);
1082         ifree = percpu_counter_sum(&mp->m_ifree);
1083         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1084 
1085         spin_lock(&mp->m_sb_lock);
1086         statp->f_bsize = sbp->sb_blocksize;
1087         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1088         statp->f_blocks = sbp->sb_dblocks - lsize;
1089         spin_unlock(&mp->m_sb_lock);
1090 
1091         statp->f_bfree = fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1092         statp->f_bavail = statp->f_bfree;
1093 
1094         fakeinos = statp->f_bfree << sbp->sb_inopblog;
1095         statp->f_files = MIN(icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1096         if (mp->m_maxicount)
1097                 statp->f_files = min_t(typeof(statp->f_files),
1098                                         statp->f_files,
1099                                         mp->m_maxicount);
1100 
1101         /* If sb_icount overshot maxicount, report actual allocation */
1102         statp->f_files = max_t(typeof(statp->f_files),
1103                                         statp->f_files,
1104                                         sbp->sb_icount);
1105 
1106         /* make sure statp->f_ffree does not underflow */
1107         ffree = statp->f_files - (icount - ifree);
1108         statp->f_ffree = max_t(__int64_t, ffree, 0);
1109 
1110 
1111         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1112             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1113                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1114                 xfs_qm_statvfs(ip, statp);
1115         return 0;
1116 }
1117 
1118 STATIC void
1119 xfs_save_resvblks(struct xfs_mount *mp)
1120 {
1121         __uint64_t resblks = 0;
1122 
1123         mp->m_resblks_save = mp->m_resblks;
1124         xfs_reserve_blocks(mp, &resblks, NULL);
1125 }
1126 
1127 STATIC void
1128 xfs_restore_resvblks(struct xfs_mount *mp)
1129 {
1130         __uint64_t resblks;
1131 
1132         if (mp->m_resblks_save) {
1133                 resblks = mp->m_resblks_save;
1134                 mp->m_resblks_save = 0;
1135         } else
1136                 resblks = xfs_default_resblks(mp);
1137 
1138         xfs_reserve_blocks(mp, &resblks, NULL);
1139 }
1140 
1141 /*
1142  * Trigger writeback of all the dirty metadata in the file system.
1143  *
1144  * This ensures that the metadata is written to their location on disk rather
1145  * than just existing in transactions in the log. This means after a quiesce
1146  * there is no log replay required to write the inodes to disk - this is the
1147  * primary difference between a sync and a quiesce.
1148  *
1149  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1150  * it is started again when appropriate.
1151  */
1152 static void
1153 xfs_quiesce_attr(
1154         struct xfs_mount        *mp)
1155 {
1156         int     error = 0;
1157 
1158         /* wait for all modifications to complete */
1159         while (atomic_read(&mp->m_active_trans) > 0)
1160                 delay(100);
1161 
1162         /* force the log to unpin objects from the now complete transactions */
1163         xfs_log_force(mp, XFS_LOG_SYNC);
1164 
1165         /* reclaim inodes to do any IO before the freeze completes */
1166         xfs_reclaim_inodes(mp, 0);
1167         xfs_reclaim_inodes(mp, SYNC_WAIT);
1168 
1169         /* Push the superblock and write an unmount record */
1170         error = xfs_log_sbcount(mp);
1171         if (error)
1172                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1173                                 "Frozen image may not be consistent.");
1174         /*
1175          * Just warn here till VFS can correctly support
1176          * read-only remount without racing.
1177          */
1178         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1179 
1180         xfs_log_quiesce(mp);
1181 }
1182 
1183 STATIC int
1184 xfs_test_remount_options(
1185         struct super_block      *sb,
1186         struct xfs_mount        *mp,
1187         char                    *options)
1188 {
1189         int                     error = 0;
1190         struct xfs_mount        *tmp_mp;
1191 
1192         tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL);
1193         if (!tmp_mp)
1194                 return -ENOMEM;
1195 
1196         tmp_mp->m_super = sb;
1197         error = xfs_parseargs(tmp_mp, options);
1198         xfs_free_fsname(tmp_mp);
1199         kfree(tmp_mp);
1200 
1201         return error;
1202 }
1203 
1204 STATIC int
1205 xfs_fs_remount(
1206         struct super_block      *sb,
1207         int                     *flags,
1208         char                    *options)
1209 {
1210         struct xfs_mount        *mp = XFS_M(sb);
1211         xfs_sb_t                *sbp = &mp->m_sb;
1212         substring_t             args[MAX_OPT_ARGS];
1213         char                    *p;
1214         int                     error;
1215 
1216         /* First, check for complete junk; i.e. invalid options */
1217         error = xfs_test_remount_options(sb, mp, options);
1218         if (error)
1219                 return error;
1220 
1221         sync_filesystem(sb);
1222         while ((p = strsep(&options, ",")) != NULL) {
1223                 int token;
1224 
1225                 if (!*p)
1226                         continue;
1227 
1228                 token = match_token(p, tokens, args);
1229                 switch (token) {
1230                 case Opt_barrier:
1231                         mp->m_flags |= XFS_MOUNT_BARRIER;
1232                         break;
1233                 case Opt_nobarrier:
1234                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
1235                         break;
1236                 case Opt_inode64:
1237                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1238                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1239                         break;
1240                 case Opt_inode32:
1241                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1242                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1243                         break;
1244                 default:
1245                         /*
1246                          * Logically we would return an error here to prevent
1247                          * users from believing they might have changed
1248                          * mount options using remount which can't be changed.
1249                          *
1250                          * But unfortunately mount(8) adds all options from
1251                          * mtab and fstab to the mount arguments in some cases
1252                          * so we can't blindly reject options, but have to
1253                          * check for each specified option if it actually
1254                          * differs from the currently set option and only
1255                          * reject it if that's the case.
1256                          *
1257                          * Until that is implemented we return success for
1258                          * every remount request, and silently ignore all
1259                          * options that we can't actually change.
1260                          */
1261 #if 0
1262                         xfs_info(mp,
1263                 "mount option \"%s\" not supported for remount", p);
1264                         return -EINVAL;
1265 #else
1266                         break;
1267 #endif
1268                 }
1269         }
1270 
1271         /* ro -> rw */
1272         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1273                 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1274                         xfs_warn(mp,
1275                 "ro->rw transition prohibited on norecovery mount");
1276                         return -EINVAL;
1277                 }
1278 
1279                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1280 
1281                 /*
1282                  * If this is the first remount to writeable state we
1283                  * might have some superblock changes to update.
1284                  */
1285                 if (mp->m_update_sb) {
1286                         error = xfs_sync_sb(mp, false);
1287                         if (error) {
1288                                 xfs_warn(mp, "failed to write sb changes");
1289                                 return error;
1290                         }
1291                         mp->m_update_sb = false;
1292                 }
1293 
1294                 /*
1295                  * Fill out the reserve pool if it is empty. Use the stashed
1296                  * value if it is non-zero, otherwise go with the default.
1297                  */
1298                 xfs_restore_resvblks(mp);
1299                 xfs_log_work_queue(mp);
1300         }
1301 
1302         /* rw -> ro */
1303         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1304                 /*
1305                  * Before we sync the metadata, we need to free up the reserve
1306                  * block pool so that the used block count in the superblock on
1307                  * disk is correct at the end of the remount. Stash the current
1308                  * reserve pool size so that if we get remounted rw, we can
1309                  * return it to the same size.
1310                  */
1311                 xfs_save_resvblks(mp);
1312                 xfs_quiesce_attr(mp);
1313                 mp->m_flags |= XFS_MOUNT_RDONLY;
1314         }
1315 
1316         return 0;
1317 }
1318 
1319 /*
1320  * Second stage of a freeze. The data is already frozen so we only
1321  * need to take care of the metadata. Once that's done sync the superblock
1322  * to the log to dirty it in case of a crash while frozen. This ensures that we
1323  * will recover the unlinked inode lists on the next mount.
1324  */
1325 STATIC int
1326 xfs_fs_freeze(
1327         struct super_block      *sb)
1328 {
1329         struct xfs_mount        *mp = XFS_M(sb);
1330 
1331         xfs_save_resvblks(mp);
1332         xfs_quiesce_attr(mp);
1333         return xfs_sync_sb(mp, true);
1334 }
1335 
1336 STATIC int
1337 xfs_fs_unfreeze(
1338         struct super_block      *sb)
1339 {
1340         struct xfs_mount        *mp = XFS_M(sb);
1341 
1342         xfs_restore_resvblks(mp);
1343         xfs_log_work_queue(mp);
1344         return 0;
1345 }
1346 
1347 STATIC int
1348 xfs_fs_show_options(
1349         struct seq_file         *m,
1350         struct dentry           *root)
1351 {
1352         return xfs_showargs(XFS_M(root->d_sb), m);
1353 }
1354 
1355 /*
1356  * This function fills in xfs_mount_t fields based on mount args.
1357  * Note: the superblock _has_ now been read in.
1358  */
1359 STATIC int
1360 xfs_finish_flags(
1361         struct xfs_mount        *mp)
1362 {
1363         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1364 
1365         /* Fail a mount where the logbuf is smaller than the log stripe */
1366         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1367                 if (mp->m_logbsize <= 0 &&
1368                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1369                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1370                 } else if (mp->m_logbsize > 0 &&
1371                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1372                         xfs_warn(mp,
1373                 "logbuf size must be greater than or equal to log stripe size");
1374                         return -EINVAL;
1375                 }
1376         } else {
1377                 /* Fail a mount if the logbuf is larger than 32K */
1378                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1379                         xfs_warn(mp,
1380                 "logbuf size for version 1 logs must be 16K or 32K");
1381                         return -EINVAL;
1382                 }
1383         }
1384 
1385         /*
1386          * V5 filesystems always use attr2 format for attributes.
1387          */
1388         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1389             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1390                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
1391                              "attr2 is always enabled for V5 filesystems.");
1392                 return -EINVAL;
1393         }
1394 
1395         /*
1396          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1397          * told by noattr2 to turn it off
1398          */
1399         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1400             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1401                 mp->m_flags |= XFS_MOUNT_ATTR2;
1402 
1403         /*
1404          * prohibit r/w mounts of read-only filesystems
1405          */
1406         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1407                 xfs_warn(mp,
1408                         "cannot mount a read-only filesystem as read-write");
1409                 return -EROFS;
1410         }
1411 
1412         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1413             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1414             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1415                 xfs_warn(mp,
1416                   "Super block does not support project and group quota together");
1417                 return -EINVAL;
1418         }
1419 
1420         return 0;
1421 }
1422 
1423 static int
1424 xfs_init_percpu_counters(
1425         struct xfs_mount        *mp)
1426 {
1427         int             error;
1428 
1429         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1430         if (error)
1431                 return -ENOMEM;
1432 
1433         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1434         if (error)
1435                 goto free_icount;
1436 
1437         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1438         if (error)
1439                 goto free_ifree;
1440 
1441         return 0;
1442 
1443 free_ifree:
1444         percpu_counter_destroy(&mp->m_ifree);
1445 free_icount:
1446         percpu_counter_destroy(&mp->m_icount);
1447         return -ENOMEM;
1448 }
1449 
1450 void
1451 xfs_reinit_percpu_counters(
1452         struct xfs_mount        *mp)
1453 {
1454         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1455         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1456         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1457 }
1458 
1459 static void
1460 xfs_destroy_percpu_counters(
1461         struct xfs_mount        *mp)
1462 {
1463         percpu_counter_destroy(&mp->m_icount);
1464         percpu_counter_destroy(&mp->m_ifree);
1465         percpu_counter_destroy(&mp->m_fdblocks);
1466 }
1467 
1468 STATIC int
1469 xfs_fs_fill_super(
1470         struct super_block      *sb,
1471         void                    *data,
1472         int                     silent)
1473 {
1474         struct inode            *root;
1475         struct xfs_mount        *mp = NULL;
1476         int                     flags = 0, error = -ENOMEM;
1477 
1478         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1479         if (!mp)
1480                 goto out;
1481 
1482         spin_lock_init(&mp->m_sb_lock);
1483         mutex_init(&mp->m_growlock);
1484         atomic_set(&mp->m_active_trans, 0);
1485         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1486         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1487         mp->m_kobj.kobject.kset = xfs_kset;
1488 
1489         mp->m_super = sb;
1490         sb->s_fs_info = mp;
1491 
1492         error = xfs_parseargs(mp, (char *)data);
1493         if (error)
1494                 goto out_free_fsname;
1495 
1496         sb_min_blocksize(sb, BBSIZE);
1497         sb->s_xattr = xfs_xattr_handlers;
1498         sb->s_export_op = &xfs_export_operations;
1499 #ifdef CONFIG_XFS_QUOTA
1500         sb->s_qcop = &xfs_quotactl_operations;
1501         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1502 #endif
1503         sb->s_op = &xfs_super_operations;
1504 
1505         if (silent)
1506                 flags |= XFS_MFSI_QUIET;
1507 
1508         error = xfs_open_devices(mp);
1509         if (error)
1510                 goto out_free_fsname;
1511 
1512         error = xfs_init_mount_workqueues(mp);
1513         if (error)
1514                 goto out_close_devices;
1515 
1516         error = xfs_init_percpu_counters(mp);
1517         if (error)
1518                 goto out_destroy_workqueues;
1519 
1520         /* Allocate stats memory before we do operations that might use it */
1521         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1522         if (!mp->m_stats.xs_stats) {
1523                 error = -ENOMEM;
1524                 goto out_destroy_counters;
1525         }
1526 
1527         error = xfs_readsb(mp, flags);
1528         if (error)
1529                 goto out_free_stats;
1530 
1531         error = xfs_finish_flags(mp);
1532         if (error)
1533                 goto out_free_sb;
1534 
1535         error = xfs_setup_devices(mp);
1536         if (error)
1537                 goto out_free_sb;
1538 
1539         error = xfs_filestream_mount(mp);
1540         if (error)
1541                 goto out_free_sb;
1542 
1543         /*
1544          * we must configure the block size in the superblock before we run the
1545          * full mount process as the mount process can lookup and cache inodes.
1546          */
1547         sb->s_magic = XFS_SB_MAGIC;
1548         sb->s_blocksize = mp->m_sb.sb_blocksize;
1549         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1550         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1551         sb->s_max_links = XFS_MAXLINK;
1552         sb->s_time_gran = 1;
1553         set_posix_acl_flag(sb);
1554 
1555         /* version 5 superblocks support inode version counters. */
1556         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1557                 sb->s_flags |= MS_I_VERSION;
1558 
1559         if (mp->m_flags & XFS_MOUNT_DAX) {
1560                 xfs_warn(mp,
1561         "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1562                 if (sb->s_blocksize != PAGE_SIZE) {
1563                         xfs_alert(mp,
1564                 "Filesystem block size invalid for DAX Turning DAX off.");
1565                         mp->m_flags &= ~XFS_MOUNT_DAX;
1566                 } else if (!sb->s_bdev->bd_disk->fops->direct_access) {
1567                         xfs_alert(mp,
1568                 "Block device does not support DAX Turning DAX off.");
1569                         mp->m_flags &= ~XFS_MOUNT_DAX;
1570                 }
1571         }
1572 
1573         if (xfs_sb_version_hassparseinodes(&mp->m_sb))
1574                 xfs_alert(mp,
1575         "EXPERIMENTAL sparse inode feature enabled. Use at your own risk!");
1576 
1577         error = xfs_mountfs(mp);
1578         if (error)
1579                 goto out_filestream_unmount;
1580 
1581         root = igrab(VFS_I(mp->m_rootip));
1582         if (!root) {
1583                 error = -ENOENT;
1584                 goto out_unmount;
1585         }
1586         sb->s_root = d_make_root(root);
1587         if (!sb->s_root) {
1588                 error = -ENOMEM;
1589                 goto out_unmount;
1590         }
1591 
1592         return 0;
1593 
1594  out_filestream_unmount:
1595         xfs_filestream_unmount(mp);
1596  out_free_sb:
1597         xfs_freesb(mp);
1598  out_free_stats:
1599         free_percpu(mp->m_stats.xs_stats);
1600  out_destroy_counters:
1601         xfs_destroy_percpu_counters(mp);
1602  out_destroy_workqueues:
1603         xfs_destroy_mount_workqueues(mp);
1604  out_close_devices:
1605         xfs_close_devices(mp);
1606  out_free_fsname:
1607         xfs_free_fsname(mp);
1608         kfree(mp);
1609  out:
1610         return error;
1611 
1612  out_unmount:
1613         xfs_filestream_unmount(mp);
1614         xfs_unmountfs(mp);
1615         goto out_free_sb;
1616 }
1617 
1618 STATIC void
1619 xfs_fs_put_super(
1620         struct super_block      *sb)
1621 {
1622         struct xfs_mount        *mp = XFS_M(sb);
1623 
1624         xfs_notice(mp, "Unmounting Filesystem");
1625         xfs_filestream_unmount(mp);
1626         xfs_unmountfs(mp);
1627 
1628         xfs_freesb(mp);
1629         free_percpu(mp->m_stats.xs_stats);
1630         xfs_destroy_percpu_counters(mp);
1631         xfs_destroy_mount_workqueues(mp);
1632         xfs_close_devices(mp);
1633         xfs_free_fsname(mp);
1634         kfree(mp);
1635 }
1636 
1637 STATIC struct dentry *
1638 xfs_fs_mount(
1639         struct file_system_type *fs_type,
1640         int                     flags,
1641         const char              *dev_name,
1642         void                    *data)
1643 {
1644         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1645 }
1646 
1647 static long
1648 xfs_fs_nr_cached_objects(
1649         struct super_block      *sb,
1650         struct shrink_control   *sc)
1651 {
1652         return xfs_reclaim_inodes_count(XFS_M(sb));
1653 }
1654 
1655 static long
1656 xfs_fs_free_cached_objects(
1657         struct super_block      *sb,
1658         struct shrink_control   *sc)
1659 {
1660         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1661 }
1662 
1663 static const struct super_operations xfs_super_operations = {
1664         .alloc_inode            = xfs_fs_alloc_inode,
1665         .destroy_inode          = xfs_fs_destroy_inode,
1666         .evict_inode            = xfs_fs_evict_inode,
1667         .drop_inode             = xfs_fs_drop_inode,
1668         .put_super              = xfs_fs_put_super,
1669         .sync_fs                = xfs_fs_sync_fs,
1670         .freeze_fs              = xfs_fs_freeze,
1671         .unfreeze_fs            = xfs_fs_unfreeze,
1672         .statfs                 = xfs_fs_statfs,
1673         .remount_fs             = xfs_fs_remount,
1674         .show_options           = xfs_fs_show_options,
1675         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1676         .free_cached_objects    = xfs_fs_free_cached_objects,
1677 };
1678 
1679 static struct file_system_type xfs_fs_type = {
1680         .owner                  = THIS_MODULE,
1681         .name                   = "xfs",
1682         .mount                  = xfs_fs_mount,
1683         .kill_sb                = kill_block_super,
1684         .fs_flags               = FS_REQUIRES_DEV,
1685 };
1686 MODULE_ALIAS_FS("xfs");
1687 
1688 STATIC int __init
1689 xfs_init_zones(void)
1690 {
1691 
1692         xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
1693         if (!xfs_ioend_zone)
1694                 goto out;
1695 
1696         xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
1697                                                   xfs_ioend_zone);
1698         if (!xfs_ioend_pool)
1699                 goto out_destroy_ioend_zone;
1700 
1701         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1702                                                 "xfs_log_ticket");
1703         if (!xfs_log_ticket_zone)
1704                 goto out_destroy_ioend_pool;
1705 
1706         xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
1707                                                 "xfs_bmap_free_item");
1708         if (!xfs_bmap_free_item_zone)
1709                 goto out_destroy_log_ticket_zone;
1710 
1711         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1712                                                 "xfs_btree_cur");
1713         if (!xfs_btree_cur_zone)
1714                 goto out_destroy_bmap_free_item_zone;
1715 
1716         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1717                                                 "xfs_da_state");
1718         if (!xfs_da_state_zone)
1719                 goto out_destroy_btree_cur_zone;
1720 
1721         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1722         if (!xfs_ifork_zone)
1723                 goto out_destroy_da_state_zone;
1724 
1725         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1726         if (!xfs_trans_zone)
1727                 goto out_destroy_ifork_zone;
1728 
1729         xfs_log_item_desc_zone =
1730                 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1731                                "xfs_log_item_desc");
1732         if (!xfs_log_item_desc_zone)
1733                 goto out_destroy_trans_zone;
1734 
1735         /*
1736          * The size of the zone allocated buf log item is the maximum
1737          * size possible under XFS.  This wastes a little bit of memory,
1738          * but it is much faster.
1739          */
1740         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1741                                            "xfs_buf_item");
1742         if (!xfs_buf_item_zone)
1743                 goto out_destroy_log_item_desc_zone;
1744 
1745         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1746                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1747                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1748         if (!xfs_efd_zone)
1749                 goto out_destroy_buf_item_zone;
1750 
1751         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1752                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1753                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1754         if (!xfs_efi_zone)
1755                 goto out_destroy_efd_zone;
1756 
1757         xfs_inode_zone =
1758                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1759                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD |
1760                         KM_ZONE_ACCOUNT, xfs_fs_inode_init_once);
1761         if (!xfs_inode_zone)
1762                 goto out_destroy_efi_zone;
1763 
1764         xfs_ili_zone =
1765                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1766                                         KM_ZONE_SPREAD, NULL);
1767         if (!xfs_ili_zone)
1768                 goto out_destroy_inode_zone;
1769         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1770                                         "xfs_icr");
1771         if (!xfs_icreate_zone)
1772                 goto out_destroy_ili_zone;
1773 
1774         return 0;
1775 
1776  out_destroy_ili_zone:
1777         kmem_zone_destroy(xfs_ili_zone);
1778  out_destroy_inode_zone:
1779         kmem_zone_destroy(xfs_inode_zone);
1780  out_destroy_efi_zone:
1781         kmem_zone_destroy(xfs_efi_zone);
1782  out_destroy_efd_zone:
1783         kmem_zone_destroy(xfs_efd_zone);
1784  out_destroy_buf_item_zone:
1785         kmem_zone_destroy(xfs_buf_item_zone);
1786  out_destroy_log_item_desc_zone:
1787         kmem_zone_destroy(xfs_log_item_desc_zone);
1788  out_destroy_trans_zone:
1789         kmem_zone_destroy(xfs_trans_zone);
1790  out_destroy_ifork_zone:
1791         kmem_zone_destroy(xfs_ifork_zone);
1792  out_destroy_da_state_zone:
1793         kmem_zone_destroy(xfs_da_state_zone);
1794  out_destroy_btree_cur_zone:
1795         kmem_zone_destroy(xfs_btree_cur_zone);
1796  out_destroy_bmap_free_item_zone:
1797         kmem_zone_destroy(xfs_bmap_free_item_zone);
1798  out_destroy_log_ticket_zone:
1799         kmem_zone_destroy(xfs_log_ticket_zone);
1800  out_destroy_ioend_pool:
1801         mempool_destroy(xfs_ioend_pool);
1802  out_destroy_ioend_zone:
1803         kmem_zone_destroy(xfs_ioend_zone);
1804  out:
1805         return -ENOMEM;
1806 }
1807 
1808 STATIC void
1809 xfs_destroy_zones(void)
1810 {
1811         /*
1812          * Make sure all delayed rcu free are flushed before we
1813          * destroy caches.
1814          */
1815         rcu_barrier();
1816         kmem_zone_destroy(xfs_icreate_zone);
1817         kmem_zone_destroy(xfs_ili_zone);
1818         kmem_zone_destroy(xfs_inode_zone);
1819         kmem_zone_destroy(xfs_efi_zone);
1820         kmem_zone_destroy(xfs_efd_zone);
1821         kmem_zone_destroy(xfs_buf_item_zone);
1822         kmem_zone_destroy(xfs_log_item_desc_zone);
1823         kmem_zone_destroy(xfs_trans_zone);
1824         kmem_zone_destroy(xfs_ifork_zone);
1825         kmem_zone_destroy(xfs_da_state_zone);
1826         kmem_zone_destroy(xfs_btree_cur_zone);
1827         kmem_zone_destroy(xfs_bmap_free_item_zone);
1828         kmem_zone_destroy(xfs_log_ticket_zone);
1829         mempool_destroy(xfs_ioend_pool);
1830         kmem_zone_destroy(xfs_ioend_zone);
1831 
1832 }
1833 
1834 STATIC int __init
1835 xfs_init_workqueues(void)
1836 {
1837         /*
1838          * The allocation workqueue can be used in memory reclaim situations
1839          * (writepage path), and parallelism is only limited by the number of
1840          * AGs in all the filesystems mounted. Hence use the default large
1841          * max_active value for this workqueue.
1842          */
1843         xfs_alloc_wq = alloc_workqueue("xfsalloc",
1844                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
1845         if (!xfs_alloc_wq)
1846                 return -ENOMEM;
1847 
1848         return 0;
1849 }
1850 
1851 STATIC void
1852 xfs_destroy_workqueues(void)
1853 {
1854         destroy_workqueue(xfs_alloc_wq);
1855 }
1856 
1857 STATIC int __init
1858 init_xfs_fs(void)
1859 {
1860         int                     error;
1861 
1862         xfs_check_ondisk_structs();
1863 
1864         printk(KERN_INFO XFS_VERSION_STRING " with "
1865                          XFS_BUILD_OPTIONS " enabled\n");
1866 
1867         xfs_dir_startup();
1868 
1869         error = xfs_init_zones();
1870         if (error)
1871                 goto out;
1872 
1873         error = xfs_init_workqueues();
1874         if (error)
1875                 goto out_destroy_zones;
1876 
1877         error = xfs_mru_cache_init();
1878         if (error)
1879                 goto out_destroy_wq;
1880 
1881         error = xfs_buf_init();
1882         if (error)
1883                 goto out_mru_cache_uninit;
1884 
1885         error = xfs_init_procfs();
1886         if (error)
1887                 goto out_buf_terminate;
1888 
1889         error = xfs_sysctl_register();
1890         if (error)
1891                 goto out_cleanup_procfs;
1892 
1893         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
1894         if (!xfs_kset) {
1895                 error = -ENOMEM;
1896                 goto out_sysctl_unregister;
1897         }
1898 
1899         xfsstats.xs_kobj.kobject.kset = xfs_kset;
1900 
1901         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
1902         if (!xfsstats.xs_stats) {
1903                 error = -ENOMEM;
1904                 goto out_kset_unregister;
1905         }
1906 
1907         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
1908                                "stats");
1909         if (error)
1910                 goto out_free_stats;
1911 
1912 #ifdef DEBUG
1913         xfs_dbg_kobj.kobject.kset = xfs_kset;
1914         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
1915         if (error)
1916                 goto out_remove_stats_kobj;
1917 #endif
1918 
1919         error = xfs_qm_init();
1920         if (error)
1921                 goto out_remove_dbg_kobj;
1922 
1923         error = register_filesystem(&xfs_fs_type);
1924         if (error)
1925                 goto out_qm_exit;
1926         return 0;
1927 
1928  out_qm_exit:
1929         xfs_qm_exit();
1930  out_remove_dbg_kobj:
1931 #ifdef DEBUG
1932         xfs_sysfs_del(&xfs_dbg_kobj);
1933  out_remove_stats_kobj:
1934 #endif
1935         xfs_sysfs_del(&xfsstats.xs_kobj);
1936  out_free_stats:
1937         free_percpu(xfsstats.xs_stats);
1938  out_kset_unregister:
1939         kset_unregister(xfs_kset);
1940  out_sysctl_unregister:
1941         xfs_sysctl_unregister();
1942  out_cleanup_procfs:
1943         xfs_cleanup_procfs();
1944  out_buf_terminate:
1945         xfs_buf_terminate();
1946  out_mru_cache_uninit:
1947         xfs_mru_cache_uninit();
1948  out_destroy_wq:
1949         xfs_destroy_workqueues();
1950  out_destroy_zones:
1951         xfs_destroy_zones();
1952  out:
1953         return error;
1954 }
1955 
1956 STATIC void __exit
1957 exit_xfs_fs(void)
1958 {
1959         xfs_qm_exit();
1960         unregister_filesystem(&xfs_fs_type);
1961 #ifdef DEBUG
1962         xfs_sysfs_del(&xfs_dbg_kobj);
1963 #endif
1964         xfs_sysfs_del(&xfsstats.xs_kobj);
1965         free_percpu(xfsstats.xs_stats);
1966         kset_unregister(xfs_kset);
1967         xfs_sysctl_unregister();
1968         xfs_cleanup_procfs();
1969         xfs_buf_terminate();
1970         xfs_mru_cache_uninit();
1971         xfs_destroy_workqueues();
1972         xfs_destroy_zones();
1973         xfs_uuid_table_free();
1974 }
1975 
1976 module_init(init_xfs_fs);
1977 module_exit(exit_xfs_fs);
1978 
1979 MODULE_AUTHOR("Silicon Graphics, Inc.");
1980 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
1981 MODULE_LICENSE("GPL");
1982 

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