Version:  2.0.40 2.2.26 2.4.37 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 4.7

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 struct bio_set *xfs_ioend_bioset;
 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 /*
 69  * Table driven mount option parser.
 70  */
 71 enum {
 72         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev, Opt_biosize,
 73         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
 74         Opt_mtpt, Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
 75         Opt_allocsize, Opt_norecovery, Opt_barrier, Opt_nobarrier,
 76         Opt_inode64, Opt_inode32, Opt_ikeep, Opt_noikeep,
 77         Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2, Opt_filestreams,
 78         Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota, Opt_prjquota,
 79         Opt_uquota, Opt_gquota, Opt_pquota,
 80         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
 81         Opt_discard, Opt_nodiscard, Opt_dax, Opt_err,
 82 };
 83 
 84 static const match_table_t tokens = {
 85         {Opt_logbufs,   "logbufs=%u"},  /* number of XFS log buffers */
 86         {Opt_logbsize,  "logbsize=%s"}, /* size of XFS log buffers */
 87         {Opt_logdev,    "logdev=%s"},   /* log device */
 88         {Opt_rtdev,     "rtdev=%s"},    /* realtime I/O device */
 89         {Opt_biosize,   "biosize=%u"},  /* log2 of preferred buffered io size */
 90         {Opt_wsync,     "wsync"},       /* safe-mode nfs compatible mount */
 91         {Opt_noalign,   "noalign"},     /* turn off stripe alignment */
 92         {Opt_swalloc,   "swalloc"},     /* turn on stripe width allocation */
 93         {Opt_sunit,     "sunit=%u"},    /* data volume stripe unit */
 94         {Opt_swidth,    "swidth=%u"},   /* data volume stripe width */
 95         {Opt_nouuid,    "nouuid"},      /* ignore filesystem UUID */
 96         {Opt_mtpt,      "mtpt"},        /* filesystem mount point */
 97         {Opt_grpid,     "grpid"},       /* group-ID from parent directory */
 98         {Opt_nogrpid,   "nogrpid"},     /* group-ID from current process */
 99         {Opt_bsdgroups, "bsdgroups"},   /* group-ID from parent directory */
100         {Opt_sysvgroups,"sysvgroups"},  /* group-ID from current process */
101         {Opt_allocsize, "allocsize=%s"},/* preferred allocation size */
102         {Opt_norecovery,"norecovery"},  /* don't run XFS recovery */
103         {Opt_barrier,   "barrier"},     /* use writer barriers for log write and
104                                          * unwritten extent conversion */
105         {Opt_nobarrier, "nobarrier"},   /* .. disable */
106         {Opt_inode64,   "inode64"},     /* inodes can be allocated anywhere */
107         {Opt_inode32,   "inode32"},     /* inode allocation limited to
108                                          * XFS_MAXINUMBER_32 */
109         {Opt_ikeep,     "ikeep"},       /* do not free empty inode clusters */
110         {Opt_noikeep,   "noikeep"},     /* free empty inode clusters */
111         {Opt_largeio,   "largeio"},     /* report large I/O sizes in stat() */
112         {Opt_nolargeio, "nolargeio"},   /* do not report large I/O sizes
113                                          * in stat(). */
114         {Opt_attr2,     "attr2"},       /* do use attr2 attribute format */
115         {Opt_noattr2,   "noattr2"},     /* do not use attr2 attribute format */
116         {Opt_filestreams,"filestreams"},/* use filestreams allocator */
117         {Opt_quota,     "quota"},       /* disk quotas (user) */
118         {Opt_noquota,   "noquota"},     /* no quotas */
119         {Opt_usrquota,  "usrquota"},    /* user quota enabled */
120         {Opt_grpquota,  "grpquota"},    /* group quota enabled */
121         {Opt_prjquota,  "prjquota"},    /* project quota enabled */
122         {Opt_uquota,    "uquota"},      /* user quota (IRIX variant) */
123         {Opt_gquota,    "gquota"},      /* group quota (IRIX variant) */
124         {Opt_pquota,    "pquota"},      /* project quota (IRIX variant) */
125         {Opt_uqnoenforce,"uqnoenforce"},/* user quota limit enforcement */
126         {Opt_gqnoenforce,"gqnoenforce"},/* group quota limit enforcement */
127         {Opt_pqnoenforce,"pqnoenforce"},/* project quota limit enforcement */
128         {Opt_qnoenforce, "qnoenforce"}, /* same as uqnoenforce */
129         {Opt_discard,   "discard"},     /* Discard unused blocks */
130         {Opt_nodiscard, "nodiscard"},   /* Do not discard unused blocks */
131 
132         {Opt_dax,       "dax"},         /* Enable direct access to bdev pages */
133         {Opt_err,       NULL},
134 };
135 
136 
137 STATIC int
138 suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
139 {
140         int     last, shift_left_factor = 0, _res;
141         char    *value;
142         int     ret = 0;
143 
144         value = match_strdup(s);
145         if (!value)
146                 return -ENOMEM;
147 
148         last = strlen(value) - 1;
149         if (value[last] == 'K' || value[last] == 'k') {
150                 shift_left_factor = 10;
151                 value[last] = '\0';
152         }
153         if (value[last] == 'M' || value[last] == 'm') {
154                 shift_left_factor = 20;
155                 value[last] = '\0';
156         }
157         if (value[last] == 'G' || value[last] == 'g') {
158                 shift_left_factor = 30;
159                 value[last] = '\0';
160         }
161 
162         if (kstrtoint(value, base, &_res))
163                 ret = -EINVAL;
164         kfree(value);
165         *res = _res << shift_left_factor;
166         return ret;
167 }
168 
169 /*
170  * This function fills in xfs_mount_t fields based on mount args.
171  * Note: the superblock has _not_ yet been read in.
172  *
173  * Note that this function leaks the various device name allocations on
174  * failure.  The caller takes care of them.
175  *
176  * *sb is const because this is also used to test options on the remount
177  * path, and we don't want this to have any side effects at remount time.
178  * Today this function does not change *sb, but just to future-proof...
179  */
180 STATIC int
181 xfs_parseargs(
182         struct xfs_mount        *mp,
183         char                    *options)
184 {
185         const struct super_block *sb = mp->m_super;
186         char                    *p;
187         substring_t             args[MAX_OPT_ARGS];
188         int                     dsunit = 0;
189         int                     dswidth = 0;
190         int                     iosize = 0;
191         __uint8_t               iosizelog = 0;
192 
193         /*
194          * set up the mount name first so all the errors will refer to the
195          * correct device.
196          */
197         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
198         if (!mp->m_fsname)
199                 return -ENOMEM;
200         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
201 
202         /*
203          * Copy binary VFS mount flags we are interested in.
204          */
205         if (sb->s_flags & MS_RDONLY)
206                 mp->m_flags |= XFS_MOUNT_RDONLY;
207         if (sb->s_flags & MS_DIRSYNC)
208                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
209         if (sb->s_flags & MS_SYNCHRONOUS)
210                 mp->m_flags |= XFS_MOUNT_WSYNC;
211 
212         /*
213          * Set some default flags that could be cleared by the mount option
214          * parsing.
215          */
216         mp->m_flags |= XFS_MOUNT_BARRIER;
217         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
218 
219         /*
220          * These can be overridden by the mount option parsing.
221          */
222         mp->m_logbufs = -1;
223         mp->m_logbsize = -1;
224 
225         if (!options)
226                 goto done;
227 
228         while ((p = strsep(&options, ",")) != NULL) {
229                 int             token;
230 
231                 if (!*p)
232                         continue;
233 
234                 token = match_token(p, tokens, args);
235                 switch (token) {
236                 case Opt_logbufs:
237                         if (match_int(args, &mp->m_logbufs))
238                                 return -EINVAL;
239                         break;
240                 case Opt_logbsize:
241                         if (suffix_kstrtoint(args, 10, &mp->m_logbsize))
242                                 return -EINVAL;
243                         break;
244                 case Opt_logdev:
245                         mp->m_logname = match_strdup(args);
246                         if (!mp->m_logname)
247                                 return -ENOMEM;
248                         break;
249                 case Opt_mtpt:
250                         xfs_warn(mp, "%s option not allowed on this system", p);
251                         return -EINVAL;
252                 case Opt_rtdev:
253                         mp->m_rtname = match_strdup(args);
254                         if (!mp->m_rtname)
255                                 return -ENOMEM;
256                         break;
257                 case Opt_allocsize:
258                 case Opt_biosize:
259                         if (suffix_kstrtoint(args, 10, &iosize))
260                                 return -EINVAL;
261                         iosizelog = ffs(iosize) - 1;
262                         break;
263                 case Opt_grpid:
264                 case Opt_bsdgroups:
265                         mp->m_flags |= XFS_MOUNT_GRPID;
266                         break;
267                 case Opt_nogrpid:
268                 case Opt_sysvgroups:
269                         mp->m_flags &= ~XFS_MOUNT_GRPID;
270                         break;
271                 case Opt_wsync:
272                         mp->m_flags |= XFS_MOUNT_WSYNC;
273                         break;
274                 case Opt_norecovery:
275                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
276                         break;
277                 case Opt_noalign:
278                         mp->m_flags |= XFS_MOUNT_NOALIGN;
279                         break;
280                 case Opt_swalloc:
281                         mp->m_flags |= XFS_MOUNT_SWALLOC;
282                         break;
283                 case Opt_sunit:
284                         if (match_int(args, &dsunit))
285                                 return -EINVAL;
286                         break;
287                 case Opt_swidth:
288                         if (match_int(args, &dswidth))
289                                 return -EINVAL;
290                         break;
291                 case Opt_inode32:
292                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
293                         break;
294                 case Opt_inode64:
295                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
296                         break;
297                 case Opt_nouuid:
298                         mp->m_flags |= XFS_MOUNT_NOUUID;
299                         break;
300                 case Opt_barrier:
301                         mp->m_flags |= XFS_MOUNT_BARRIER;
302                         break;
303                 case Opt_nobarrier:
304                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
305                         break;
306                 case Opt_ikeep:
307                         mp->m_flags |= XFS_MOUNT_IKEEP;
308                         break;
309                 case Opt_noikeep:
310                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
311                         break;
312                 case Opt_largeio:
313                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
314                         break;
315                 case Opt_nolargeio:
316                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
317                         break;
318                 case Opt_attr2:
319                         mp->m_flags |= XFS_MOUNT_ATTR2;
320                         break;
321                 case Opt_noattr2:
322                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
323                         mp->m_flags |= XFS_MOUNT_NOATTR2;
324                         break;
325                 case Opt_filestreams:
326                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
327                         break;
328                 case Opt_noquota:
329                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
330                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
331                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
332                         break;
333                 case Opt_quota:
334                 case Opt_uquota:
335                 case Opt_usrquota:
336                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
337                                          XFS_UQUOTA_ENFD);
338                         break;
339                 case Opt_qnoenforce:
340                 case Opt_uqnoenforce:
341                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
342                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
343                         break;
344                 case Opt_pquota:
345                 case Opt_prjquota:
346                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
347                                          XFS_PQUOTA_ENFD);
348                         break;
349                 case Opt_pqnoenforce:
350                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
351                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
352                         break;
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 inactivate and 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         ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
942         XFS_STATS_INC(ip->i_mount, vn_rele);
943         XFS_STATS_INC(ip->i_mount, vn_remove);
944 
945         xfs_inactive(ip);
946 
947         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
948         XFS_STATS_INC(ip->i_mount, vn_reclaim);
949 
950         /*
951          * We should never get here with one of the reclaim flags already set.
952          */
953         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
954         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
955 
956         /*
957          * We always use background reclaim here because even if the
958          * inode is clean, it still may be under IO and hence we have
959          * to take the flush lock. The background reclaim path handles
960          * this more efficiently than we can here, so simply let background
961          * reclaim tear down all inodes.
962          */
963         xfs_inode_set_reclaim_tag(ip);
964 }
965 
966 /*
967  * Slab object creation initialisation for the XFS inode.
968  * This covers only the idempotent fields in the XFS inode;
969  * all other fields need to be initialised on allocation
970  * from the slab. This avoids the need to repeatedly initialise
971  * fields in the xfs inode that left in the initialise state
972  * when freeing the inode.
973  */
974 STATIC void
975 xfs_fs_inode_init_once(
976         void                    *inode)
977 {
978         struct xfs_inode        *ip = inode;
979 
980         memset(ip, 0, sizeof(struct xfs_inode));
981 
982         /* vfs inode */
983         inode_init_once(VFS_I(ip));
984 
985         /* xfs inode */
986         atomic_set(&ip->i_pincount, 0);
987         spin_lock_init(&ip->i_flags_lock);
988 
989         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
990                      "xfsino", ip->i_ino);
991         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
992                      "xfsino", ip->i_ino);
993 }
994 
995 /*
996  * We do an unlocked check for XFS_IDONTCACHE here because we are already
997  * serialised against cache hits here via the inode->i_lock and igrab() in
998  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
999  * racing with us, and it avoids needing to grab a spinlock here for every inode
1000  * we drop the final reference on.
1001  */
1002 STATIC int
1003 xfs_fs_drop_inode(
1004         struct inode            *inode)
1005 {
1006         struct xfs_inode        *ip = XFS_I(inode);
1007 
1008         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1009 }
1010 
1011 STATIC void
1012 xfs_free_fsname(
1013         struct xfs_mount        *mp)
1014 {
1015         kfree(mp->m_fsname);
1016         kfree(mp->m_rtname);
1017         kfree(mp->m_logname);
1018 }
1019 
1020 STATIC int
1021 xfs_fs_sync_fs(
1022         struct super_block      *sb,
1023         int                     wait)
1024 {
1025         struct xfs_mount        *mp = XFS_M(sb);
1026 
1027         /*
1028          * Doing anything during the async pass would be counterproductive.
1029          */
1030         if (!wait)
1031                 return 0;
1032 
1033         xfs_log_force(mp, XFS_LOG_SYNC);
1034         if (laptop_mode) {
1035                 /*
1036                  * The disk must be active because we're syncing.
1037                  * We schedule log work now (now that the disk is
1038                  * active) instead of later (when it might not be).
1039                  */
1040                 flush_delayed_work(&mp->m_log->l_work);
1041         }
1042 
1043         return 0;
1044 }
1045 
1046 STATIC int
1047 xfs_fs_statfs(
1048         struct dentry           *dentry,
1049         struct kstatfs          *statp)
1050 {
1051         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1052         xfs_sb_t                *sbp = &mp->m_sb;
1053         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
1054         __uint64_t              fakeinos, id;
1055         __uint64_t              icount;
1056         __uint64_t              ifree;
1057         __uint64_t              fdblocks;
1058         xfs_extlen_t            lsize;
1059         __int64_t               ffree;
1060 
1061         statp->f_type = XFS_SB_MAGIC;
1062         statp->f_namelen = MAXNAMELEN - 1;
1063 
1064         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1065         statp->f_fsid.val[0] = (u32)id;
1066         statp->f_fsid.val[1] = (u32)(id >> 32);
1067 
1068         icount = percpu_counter_sum(&mp->m_icount);
1069         ifree = percpu_counter_sum(&mp->m_ifree);
1070         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1071 
1072         spin_lock(&mp->m_sb_lock);
1073         statp->f_bsize = sbp->sb_blocksize;
1074         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1075         statp->f_blocks = sbp->sb_dblocks - lsize;
1076         spin_unlock(&mp->m_sb_lock);
1077 
1078         statp->f_bfree = fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1079         statp->f_bavail = statp->f_bfree;
1080 
1081         fakeinos = statp->f_bfree << sbp->sb_inopblog;
1082         statp->f_files = MIN(icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1083         if (mp->m_maxicount)
1084                 statp->f_files = min_t(typeof(statp->f_files),
1085                                         statp->f_files,
1086                                         mp->m_maxicount);
1087 
1088         /* If sb_icount overshot maxicount, report actual allocation */
1089         statp->f_files = max_t(typeof(statp->f_files),
1090                                         statp->f_files,
1091                                         sbp->sb_icount);
1092 
1093         /* make sure statp->f_ffree does not underflow */
1094         ffree = statp->f_files - (icount - ifree);
1095         statp->f_ffree = max_t(__int64_t, ffree, 0);
1096 
1097 
1098         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1099             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1100                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1101                 xfs_qm_statvfs(ip, statp);
1102         return 0;
1103 }
1104 
1105 STATIC void
1106 xfs_save_resvblks(struct xfs_mount *mp)
1107 {
1108         __uint64_t resblks = 0;
1109 
1110         mp->m_resblks_save = mp->m_resblks;
1111         xfs_reserve_blocks(mp, &resblks, NULL);
1112 }
1113 
1114 STATIC void
1115 xfs_restore_resvblks(struct xfs_mount *mp)
1116 {
1117         __uint64_t resblks;
1118 
1119         if (mp->m_resblks_save) {
1120                 resblks = mp->m_resblks_save;
1121                 mp->m_resblks_save = 0;
1122         } else
1123                 resblks = xfs_default_resblks(mp);
1124 
1125         xfs_reserve_blocks(mp, &resblks, NULL);
1126 }
1127 
1128 /*
1129  * Trigger writeback of all the dirty metadata in the file system.
1130  *
1131  * This ensures that the metadata is written to their location on disk rather
1132  * than just existing in transactions in the log. This means after a quiesce
1133  * there is no log replay required to write the inodes to disk - this is the
1134  * primary difference between a sync and a quiesce.
1135  *
1136  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1137  * it is started again when appropriate.
1138  */
1139 static void
1140 xfs_quiesce_attr(
1141         struct xfs_mount        *mp)
1142 {
1143         int     error = 0;
1144 
1145         /* wait for all modifications to complete */
1146         while (atomic_read(&mp->m_active_trans) > 0)
1147                 delay(100);
1148 
1149         /* force the log to unpin objects from the now complete transactions */
1150         xfs_log_force(mp, XFS_LOG_SYNC);
1151 
1152         /* reclaim inodes to do any IO before the freeze completes */
1153         xfs_reclaim_inodes(mp, 0);
1154         xfs_reclaim_inodes(mp, SYNC_WAIT);
1155 
1156         /* Push the superblock and write an unmount record */
1157         error = xfs_log_sbcount(mp);
1158         if (error)
1159                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1160                                 "Frozen image may not be consistent.");
1161         /*
1162          * Just warn here till VFS can correctly support
1163          * read-only remount without racing.
1164          */
1165         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1166 
1167         xfs_log_quiesce(mp);
1168 }
1169 
1170 STATIC int
1171 xfs_test_remount_options(
1172         struct super_block      *sb,
1173         struct xfs_mount        *mp,
1174         char                    *options)
1175 {
1176         int                     error = 0;
1177         struct xfs_mount        *tmp_mp;
1178 
1179         tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL);
1180         if (!tmp_mp)
1181                 return -ENOMEM;
1182 
1183         tmp_mp->m_super = sb;
1184         error = xfs_parseargs(tmp_mp, options);
1185         xfs_free_fsname(tmp_mp);
1186         kfree(tmp_mp);
1187 
1188         return error;
1189 }
1190 
1191 STATIC int
1192 xfs_fs_remount(
1193         struct super_block      *sb,
1194         int                     *flags,
1195         char                    *options)
1196 {
1197         struct xfs_mount        *mp = XFS_M(sb);
1198         xfs_sb_t                *sbp = &mp->m_sb;
1199         substring_t             args[MAX_OPT_ARGS];
1200         char                    *p;
1201         int                     error;
1202 
1203         /* First, check for complete junk; i.e. invalid options */
1204         error = xfs_test_remount_options(sb, mp, options);
1205         if (error)
1206                 return error;
1207 
1208         sync_filesystem(sb);
1209         while ((p = strsep(&options, ",")) != NULL) {
1210                 int token;
1211 
1212                 if (!*p)
1213                         continue;
1214 
1215                 token = match_token(p, tokens, args);
1216                 switch (token) {
1217                 case Opt_barrier:
1218                         mp->m_flags |= XFS_MOUNT_BARRIER;
1219                         break;
1220                 case Opt_nobarrier:
1221                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
1222                         break;
1223                 case Opt_inode64:
1224                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1225                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1226                         break;
1227                 case Opt_inode32:
1228                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1229                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1230                         break;
1231                 default:
1232                         /*
1233                          * Logically we would return an error here to prevent
1234                          * users from believing they might have changed
1235                          * mount options using remount which can't be changed.
1236                          *
1237                          * But unfortunately mount(8) adds all options from
1238                          * mtab and fstab to the mount arguments in some cases
1239                          * so we can't blindly reject options, but have to
1240                          * check for each specified option if it actually
1241                          * differs from the currently set option and only
1242                          * reject it if that's the case.
1243                          *
1244                          * Until that is implemented we return success for
1245                          * every remount request, and silently ignore all
1246                          * options that we can't actually change.
1247                          */
1248 #if 0
1249                         xfs_info(mp,
1250                 "mount option \"%s\" not supported for remount", p);
1251                         return -EINVAL;
1252 #else
1253                         break;
1254 #endif
1255                 }
1256         }
1257 
1258         /* ro -> rw */
1259         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1260                 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1261                         xfs_warn(mp,
1262                 "ro->rw transition prohibited on norecovery mount");
1263                         return -EINVAL;
1264                 }
1265 
1266                 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1267                     xfs_sb_has_ro_compat_feature(sbp,
1268                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1269                         xfs_warn(mp,
1270 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1271                                 (sbp->sb_features_ro_compat &
1272                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1273                         return -EINVAL;
1274                 }
1275 
1276                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1277 
1278                 /*
1279                  * If this is the first remount to writeable state we
1280                  * might have some superblock changes to update.
1281                  */
1282                 if (mp->m_update_sb) {
1283                         error = xfs_sync_sb(mp, false);
1284                         if (error) {
1285                                 xfs_warn(mp, "failed to write sb changes");
1286                                 return error;
1287                         }
1288                         mp->m_update_sb = false;
1289                 }
1290 
1291                 /*
1292                  * Fill out the reserve pool if it is empty. Use the stashed
1293                  * value if it is non-zero, otherwise go with the default.
1294                  */
1295                 xfs_restore_resvblks(mp);
1296                 xfs_log_work_queue(mp);
1297         }
1298 
1299         /* rw -> ro */
1300         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1301                 /*
1302                  * Before we sync the metadata, we need to free up the reserve
1303                  * block pool so that the used block count in the superblock on
1304                  * disk is correct at the end of the remount. Stash the current
1305                  * reserve pool size so that if we get remounted rw, we can
1306                  * return it to the same size.
1307                  */
1308                 xfs_save_resvblks(mp);
1309                 xfs_quiesce_attr(mp);
1310                 mp->m_flags |= XFS_MOUNT_RDONLY;
1311         }
1312 
1313         return 0;
1314 }
1315 
1316 /*
1317  * Second stage of a freeze. The data is already frozen so we only
1318  * need to take care of the metadata. Once that's done sync the superblock
1319  * to the log to dirty it in case of a crash while frozen. This ensures that we
1320  * will recover the unlinked inode lists on the next mount.
1321  */
1322 STATIC int
1323 xfs_fs_freeze(
1324         struct super_block      *sb)
1325 {
1326         struct xfs_mount        *mp = XFS_M(sb);
1327 
1328         xfs_save_resvblks(mp);
1329         xfs_quiesce_attr(mp);
1330         return xfs_sync_sb(mp, true);
1331 }
1332 
1333 STATIC int
1334 xfs_fs_unfreeze(
1335         struct super_block      *sb)
1336 {
1337         struct xfs_mount        *mp = XFS_M(sb);
1338 
1339         xfs_restore_resvblks(mp);
1340         xfs_log_work_queue(mp);
1341         return 0;
1342 }
1343 
1344 STATIC int
1345 xfs_fs_show_options(
1346         struct seq_file         *m,
1347         struct dentry           *root)
1348 {
1349         return xfs_showargs(XFS_M(root->d_sb), m);
1350 }
1351 
1352 /*
1353  * This function fills in xfs_mount_t fields based on mount args.
1354  * Note: the superblock _has_ now been read in.
1355  */
1356 STATIC int
1357 xfs_finish_flags(
1358         struct xfs_mount        *mp)
1359 {
1360         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1361 
1362         /* Fail a mount where the logbuf is smaller than the log stripe */
1363         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1364                 if (mp->m_logbsize <= 0 &&
1365                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1366                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1367                 } else if (mp->m_logbsize > 0 &&
1368                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1369                         xfs_warn(mp,
1370                 "logbuf size must be greater than or equal to log stripe size");
1371                         return -EINVAL;
1372                 }
1373         } else {
1374                 /* Fail a mount if the logbuf is larger than 32K */
1375                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1376                         xfs_warn(mp,
1377                 "logbuf size for version 1 logs must be 16K or 32K");
1378                         return -EINVAL;
1379                 }
1380         }
1381 
1382         /*
1383          * V5 filesystems always use attr2 format for attributes.
1384          */
1385         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1386             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1387                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
1388                              "attr2 is always enabled for V5 filesystems.");
1389                 return -EINVAL;
1390         }
1391 
1392         /*
1393          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1394          * told by noattr2 to turn it off
1395          */
1396         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1397             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1398                 mp->m_flags |= XFS_MOUNT_ATTR2;
1399 
1400         /*
1401          * prohibit r/w mounts of read-only filesystems
1402          */
1403         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1404                 xfs_warn(mp,
1405                         "cannot mount a read-only filesystem as read-write");
1406                 return -EROFS;
1407         }
1408 
1409         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1410             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1411             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1412                 xfs_warn(mp,
1413                   "Super block does not support project and group quota together");
1414                 return -EINVAL;
1415         }
1416 
1417         return 0;
1418 }
1419 
1420 static int
1421 xfs_init_percpu_counters(
1422         struct xfs_mount        *mp)
1423 {
1424         int             error;
1425 
1426         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1427         if (error)
1428                 return -ENOMEM;
1429 
1430         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1431         if (error)
1432                 goto free_icount;
1433 
1434         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1435         if (error)
1436                 goto free_ifree;
1437 
1438         return 0;
1439 
1440 free_ifree:
1441         percpu_counter_destroy(&mp->m_ifree);
1442 free_icount:
1443         percpu_counter_destroy(&mp->m_icount);
1444         return -ENOMEM;
1445 }
1446 
1447 void
1448 xfs_reinit_percpu_counters(
1449         struct xfs_mount        *mp)
1450 {
1451         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1452         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1453         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1454 }
1455 
1456 static void
1457 xfs_destroy_percpu_counters(
1458         struct xfs_mount        *mp)
1459 {
1460         percpu_counter_destroy(&mp->m_icount);
1461         percpu_counter_destroy(&mp->m_ifree);
1462         percpu_counter_destroy(&mp->m_fdblocks);
1463 }
1464 
1465 STATIC int
1466 xfs_fs_fill_super(
1467         struct super_block      *sb,
1468         void                    *data,
1469         int                     silent)
1470 {
1471         struct inode            *root;
1472         struct xfs_mount        *mp = NULL;
1473         int                     flags = 0, error = -ENOMEM;
1474 
1475         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1476         if (!mp)
1477                 goto out;
1478 
1479         spin_lock_init(&mp->m_sb_lock);
1480         mutex_init(&mp->m_growlock);
1481         atomic_set(&mp->m_active_trans, 0);
1482         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1483         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1484         mp->m_kobj.kobject.kset = xfs_kset;
1485 
1486         mp->m_super = sb;
1487         sb->s_fs_info = mp;
1488 
1489         error = xfs_parseargs(mp, (char *)data);
1490         if (error)
1491                 goto out_free_fsname;
1492 
1493         sb_min_blocksize(sb, BBSIZE);
1494         sb->s_xattr = xfs_xattr_handlers;
1495         sb->s_export_op = &xfs_export_operations;
1496 #ifdef CONFIG_XFS_QUOTA
1497         sb->s_qcop = &xfs_quotactl_operations;
1498         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1499 #endif
1500         sb->s_op = &xfs_super_operations;
1501 
1502         if (silent)
1503                 flags |= XFS_MFSI_QUIET;
1504 
1505         error = xfs_open_devices(mp);
1506         if (error)
1507                 goto out_free_fsname;
1508 
1509         error = xfs_init_mount_workqueues(mp);
1510         if (error)
1511                 goto out_close_devices;
1512 
1513         error = xfs_init_percpu_counters(mp);
1514         if (error)
1515                 goto out_destroy_workqueues;
1516 
1517         /* Allocate stats memory before we do operations that might use it */
1518         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1519         if (!mp->m_stats.xs_stats) {
1520                 error = -ENOMEM;
1521                 goto out_destroy_counters;
1522         }
1523 
1524         error = xfs_readsb(mp, flags);
1525         if (error)
1526                 goto out_free_stats;
1527 
1528         error = xfs_finish_flags(mp);
1529         if (error)
1530                 goto out_free_sb;
1531 
1532         error = xfs_setup_devices(mp);
1533         if (error)
1534                 goto out_free_sb;
1535 
1536         error = xfs_filestream_mount(mp);
1537         if (error)
1538                 goto out_free_sb;
1539 
1540         /*
1541          * we must configure the block size in the superblock before we run the
1542          * full mount process as the mount process can lookup and cache inodes.
1543          */
1544         sb->s_magic = XFS_SB_MAGIC;
1545         sb->s_blocksize = mp->m_sb.sb_blocksize;
1546         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1547         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1548         sb->s_max_links = XFS_MAXLINK;
1549         sb->s_time_gran = 1;
1550         set_posix_acl_flag(sb);
1551 
1552         /* version 5 superblocks support inode version counters. */
1553         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1554                 sb->s_flags |= MS_I_VERSION;
1555 
1556         if (mp->m_flags & XFS_MOUNT_DAX) {
1557                 xfs_warn(mp,
1558                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1559 
1560                 error = bdev_dax_supported(sb, sb->s_blocksize);
1561                 if (error) {
1562                         xfs_alert(mp,
1563                         "DAX unsupported by block device. Turning off DAX.");
1564                         mp->m_flags &= ~XFS_MOUNT_DAX;
1565                 }
1566         }
1567 
1568         if (xfs_sb_version_hassparseinodes(&mp->m_sb))
1569                 xfs_alert(mp,
1570         "EXPERIMENTAL sparse inode feature enabled. Use at your own risk!");
1571 
1572         error = xfs_mountfs(mp);
1573         if (error)
1574                 goto out_filestream_unmount;
1575 
1576         root = igrab(VFS_I(mp->m_rootip));
1577         if (!root) {
1578                 error = -ENOENT;
1579                 goto out_unmount;
1580         }
1581         sb->s_root = d_make_root(root);
1582         if (!sb->s_root) {
1583                 error = -ENOMEM;
1584                 goto out_unmount;
1585         }
1586 
1587         return 0;
1588 
1589  out_filestream_unmount:
1590         xfs_filestream_unmount(mp);
1591  out_free_sb:
1592         xfs_freesb(mp);
1593  out_free_stats:
1594         free_percpu(mp->m_stats.xs_stats);
1595  out_destroy_counters:
1596         xfs_destroy_percpu_counters(mp);
1597  out_destroy_workqueues:
1598         xfs_destroy_mount_workqueues(mp);
1599  out_close_devices:
1600         xfs_close_devices(mp);
1601  out_free_fsname:
1602         xfs_free_fsname(mp);
1603         kfree(mp);
1604  out:
1605         return error;
1606 
1607  out_unmount:
1608         xfs_filestream_unmount(mp);
1609         xfs_unmountfs(mp);
1610         goto out_free_sb;
1611 }
1612 
1613 STATIC void
1614 xfs_fs_put_super(
1615         struct super_block      *sb)
1616 {
1617         struct xfs_mount        *mp = XFS_M(sb);
1618 
1619         xfs_notice(mp, "Unmounting Filesystem");
1620         xfs_filestream_unmount(mp);
1621         xfs_unmountfs(mp);
1622 
1623         xfs_freesb(mp);
1624         free_percpu(mp->m_stats.xs_stats);
1625         xfs_destroy_percpu_counters(mp);
1626         xfs_destroy_mount_workqueues(mp);
1627         xfs_close_devices(mp);
1628         xfs_free_fsname(mp);
1629         kfree(mp);
1630 }
1631 
1632 STATIC struct dentry *
1633 xfs_fs_mount(
1634         struct file_system_type *fs_type,
1635         int                     flags,
1636         const char              *dev_name,
1637         void                    *data)
1638 {
1639         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1640 }
1641 
1642 static long
1643 xfs_fs_nr_cached_objects(
1644         struct super_block      *sb,
1645         struct shrink_control   *sc)
1646 {
1647         return xfs_reclaim_inodes_count(XFS_M(sb));
1648 }
1649 
1650 static long
1651 xfs_fs_free_cached_objects(
1652         struct super_block      *sb,
1653         struct shrink_control   *sc)
1654 {
1655         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1656 }
1657 
1658 static const struct super_operations xfs_super_operations = {
1659         .alloc_inode            = xfs_fs_alloc_inode,
1660         .destroy_inode          = xfs_fs_destroy_inode,
1661         .drop_inode             = xfs_fs_drop_inode,
1662         .put_super              = xfs_fs_put_super,
1663         .sync_fs                = xfs_fs_sync_fs,
1664         .freeze_fs              = xfs_fs_freeze,
1665         .unfreeze_fs            = xfs_fs_unfreeze,
1666         .statfs                 = xfs_fs_statfs,
1667         .remount_fs             = xfs_fs_remount,
1668         .show_options           = xfs_fs_show_options,
1669         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1670         .free_cached_objects    = xfs_fs_free_cached_objects,
1671 };
1672 
1673 static struct file_system_type xfs_fs_type = {
1674         .owner                  = THIS_MODULE,
1675         .name                   = "xfs",
1676         .mount                  = xfs_fs_mount,
1677         .kill_sb                = kill_block_super,
1678         .fs_flags               = FS_REQUIRES_DEV,
1679 };
1680 MODULE_ALIAS_FS("xfs");
1681 
1682 STATIC int __init
1683 xfs_init_zones(void)
1684 {
1685         xfs_ioend_bioset = bioset_create(4 * MAX_BUF_PER_PAGE,
1686                         offsetof(struct xfs_ioend, io_inline_bio));
1687         if (!xfs_ioend_bioset)
1688                 goto out;
1689 
1690         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1691                                                 "xfs_log_ticket");
1692         if (!xfs_log_ticket_zone)
1693                 goto out_free_ioend_bioset;
1694 
1695         xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
1696                                                 "xfs_bmap_free_item");
1697         if (!xfs_bmap_free_item_zone)
1698                 goto out_destroy_log_ticket_zone;
1699 
1700         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1701                                                 "xfs_btree_cur");
1702         if (!xfs_btree_cur_zone)
1703                 goto out_destroy_bmap_free_item_zone;
1704 
1705         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1706                                                 "xfs_da_state");
1707         if (!xfs_da_state_zone)
1708                 goto out_destroy_btree_cur_zone;
1709 
1710         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1711         if (!xfs_ifork_zone)
1712                 goto out_destroy_da_state_zone;
1713 
1714         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1715         if (!xfs_trans_zone)
1716                 goto out_destroy_ifork_zone;
1717 
1718         xfs_log_item_desc_zone =
1719                 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1720                                "xfs_log_item_desc");
1721         if (!xfs_log_item_desc_zone)
1722                 goto out_destroy_trans_zone;
1723 
1724         /*
1725          * The size of the zone allocated buf log item is the maximum
1726          * size possible under XFS.  This wastes a little bit of memory,
1727          * but it is much faster.
1728          */
1729         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1730                                            "xfs_buf_item");
1731         if (!xfs_buf_item_zone)
1732                 goto out_destroy_log_item_desc_zone;
1733 
1734         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1735                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1736                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1737         if (!xfs_efd_zone)
1738                 goto out_destroy_buf_item_zone;
1739 
1740         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1741                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1742                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1743         if (!xfs_efi_zone)
1744                 goto out_destroy_efd_zone;
1745 
1746         xfs_inode_zone =
1747                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1748                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD |
1749                         KM_ZONE_ACCOUNT, xfs_fs_inode_init_once);
1750         if (!xfs_inode_zone)
1751                 goto out_destroy_efi_zone;
1752 
1753         xfs_ili_zone =
1754                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1755                                         KM_ZONE_SPREAD, NULL);
1756         if (!xfs_ili_zone)
1757                 goto out_destroy_inode_zone;
1758         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1759                                         "xfs_icr");
1760         if (!xfs_icreate_zone)
1761                 goto out_destroy_ili_zone;
1762 
1763         return 0;
1764 
1765  out_destroy_ili_zone:
1766         kmem_zone_destroy(xfs_ili_zone);
1767  out_destroy_inode_zone:
1768         kmem_zone_destroy(xfs_inode_zone);
1769  out_destroy_efi_zone:
1770         kmem_zone_destroy(xfs_efi_zone);
1771  out_destroy_efd_zone:
1772         kmem_zone_destroy(xfs_efd_zone);
1773  out_destroy_buf_item_zone:
1774         kmem_zone_destroy(xfs_buf_item_zone);
1775  out_destroy_log_item_desc_zone:
1776         kmem_zone_destroy(xfs_log_item_desc_zone);
1777  out_destroy_trans_zone:
1778         kmem_zone_destroy(xfs_trans_zone);
1779  out_destroy_ifork_zone:
1780         kmem_zone_destroy(xfs_ifork_zone);
1781  out_destroy_da_state_zone:
1782         kmem_zone_destroy(xfs_da_state_zone);
1783  out_destroy_btree_cur_zone:
1784         kmem_zone_destroy(xfs_btree_cur_zone);
1785  out_destroy_bmap_free_item_zone:
1786         kmem_zone_destroy(xfs_bmap_free_item_zone);
1787  out_destroy_log_ticket_zone:
1788         kmem_zone_destroy(xfs_log_ticket_zone);
1789  out_free_ioend_bioset:
1790         bioset_free(xfs_ioend_bioset);
1791  out:
1792         return -ENOMEM;
1793 }
1794 
1795 STATIC void
1796 xfs_destroy_zones(void)
1797 {
1798         /*
1799          * Make sure all delayed rcu free are flushed before we
1800          * destroy caches.
1801          */
1802         rcu_barrier();
1803         kmem_zone_destroy(xfs_icreate_zone);
1804         kmem_zone_destroy(xfs_ili_zone);
1805         kmem_zone_destroy(xfs_inode_zone);
1806         kmem_zone_destroy(xfs_efi_zone);
1807         kmem_zone_destroy(xfs_efd_zone);
1808         kmem_zone_destroy(xfs_buf_item_zone);
1809         kmem_zone_destroy(xfs_log_item_desc_zone);
1810         kmem_zone_destroy(xfs_trans_zone);
1811         kmem_zone_destroy(xfs_ifork_zone);
1812         kmem_zone_destroy(xfs_da_state_zone);
1813         kmem_zone_destroy(xfs_btree_cur_zone);
1814         kmem_zone_destroy(xfs_bmap_free_item_zone);
1815         kmem_zone_destroy(xfs_log_ticket_zone);
1816         bioset_free(xfs_ioend_bioset);
1817 }
1818 
1819 STATIC int __init
1820 xfs_init_workqueues(void)
1821 {
1822         /*
1823          * The allocation workqueue can be used in memory reclaim situations
1824          * (writepage path), and parallelism is only limited by the number of
1825          * AGs in all the filesystems mounted. Hence use the default large
1826          * max_active value for this workqueue.
1827          */
1828         xfs_alloc_wq = alloc_workqueue("xfsalloc",
1829                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
1830         if (!xfs_alloc_wq)
1831                 return -ENOMEM;
1832 
1833         return 0;
1834 }
1835 
1836 STATIC void
1837 xfs_destroy_workqueues(void)
1838 {
1839         destroy_workqueue(xfs_alloc_wq);
1840 }
1841 
1842 STATIC int __init
1843 init_xfs_fs(void)
1844 {
1845         int                     error;
1846 
1847         xfs_check_ondisk_structs();
1848 
1849         printk(KERN_INFO XFS_VERSION_STRING " with "
1850                          XFS_BUILD_OPTIONS " enabled\n");
1851 
1852         xfs_dir_startup();
1853 
1854         error = xfs_init_zones();
1855         if (error)
1856                 goto out;
1857 
1858         error = xfs_init_workqueues();
1859         if (error)
1860                 goto out_destroy_zones;
1861 
1862         error = xfs_mru_cache_init();
1863         if (error)
1864                 goto out_destroy_wq;
1865 
1866         error = xfs_buf_init();
1867         if (error)
1868                 goto out_mru_cache_uninit;
1869 
1870         error = xfs_init_procfs();
1871         if (error)
1872                 goto out_buf_terminate;
1873 
1874         error = xfs_sysctl_register();
1875         if (error)
1876                 goto out_cleanup_procfs;
1877 
1878         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
1879         if (!xfs_kset) {
1880                 error = -ENOMEM;
1881                 goto out_sysctl_unregister;
1882         }
1883 
1884         xfsstats.xs_kobj.kobject.kset = xfs_kset;
1885 
1886         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
1887         if (!xfsstats.xs_stats) {
1888                 error = -ENOMEM;
1889                 goto out_kset_unregister;
1890         }
1891 
1892         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
1893                                "stats");
1894         if (error)
1895                 goto out_free_stats;
1896 
1897 #ifdef DEBUG
1898         xfs_dbg_kobj.kobject.kset = xfs_kset;
1899         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
1900         if (error)
1901                 goto out_remove_stats_kobj;
1902 #endif
1903 
1904         error = xfs_qm_init();
1905         if (error)
1906                 goto out_remove_dbg_kobj;
1907 
1908         error = register_filesystem(&xfs_fs_type);
1909         if (error)
1910                 goto out_qm_exit;
1911         return 0;
1912 
1913  out_qm_exit:
1914         xfs_qm_exit();
1915  out_remove_dbg_kobj:
1916 #ifdef DEBUG
1917         xfs_sysfs_del(&xfs_dbg_kobj);
1918  out_remove_stats_kobj:
1919 #endif
1920         xfs_sysfs_del(&xfsstats.xs_kobj);
1921  out_free_stats:
1922         free_percpu(xfsstats.xs_stats);
1923  out_kset_unregister:
1924         kset_unregister(xfs_kset);
1925  out_sysctl_unregister:
1926         xfs_sysctl_unregister();
1927  out_cleanup_procfs:
1928         xfs_cleanup_procfs();
1929  out_buf_terminate:
1930         xfs_buf_terminate();
1931  out_mru_cache_uninit:
1932         xfs_mru_cache_uninit();
1933  out_destroy_wq:
1934         xfs_destroy_workqueues();
1935  out_destroy_zones:
1936         xfs_destroy_zones();
1937  out:
1938         return error;
1939 }
1940 
1941 STATIC void __exit
1942 exit_xfs_fs(void)
1943 {
1944         xfs_qm_exit();
1945         unregister_filesystem(&xfs_fs_type);
1946 #ifdef DEBUG
1947         xfs_sysfs_del(&xfs_dbg_kobj);
1948 #endif
1949         xfs_sysfs_del(&xfsstats.xs_kobj);
1950         free_percpu(xfsstats.xs_stats);
1951         kset_unregister(xfs_kset);
1952         xfs_sysctl_unregister();
1953         xfs_cleanup_procfs();
1954         xfs_buf_terminate();
1955         xfs_mru_cache_uninit();
1956         xfs_destroy_workqueues();
1957         xfs_destroy_zones();
1958         xfs_uuid_table_free();
1959 }
1960 
1961 module_init(init_xfs_fs);
1962 module_exit(exit_xfs_fs);
1963 
1964 MODULE_AUTHOR("Silicon Graphics, Inc.");
1965 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
1966 MODULE_LICENSE("GPL");
1967 

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