Version:  2.0.40 2.2.26 2.4.37 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 4.8 4.9

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 #include "xfs_rmap_item.h"
 50 #include "xfs_refcount_item.h"
 51 #include "xfs_bmap_item.h"
 52 #include "xfs_reflink.h"
 53 
 54 #include <linux/namei.h>
 55 #include <linux/init.h>
 56 #include <linux/slab.h>
 57 #include <linux/mount.h>
 58 #include <linux/mempool.h>
 59 #include <linux/writeback.h>
 60 #include <linux/kthread.h>
 61 #include <linux/freezer.h>
 62 #include <linux/parser.h>
 63 
 64 static const struct super_operations xfs_super_operations;
 65 struct bio_set *xfs_ioend_bioset;
 66 
 67 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
 68 #ifdef DEBUG
 69 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
 70 #endif
 71 
 72 /*
 73  * Table driven mount option parser.
 74  */
 75 enum {
 76         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev, Opt_biosize,
 77         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
 78         Opt_mtpt, Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
 79         Opt_allocsize, Opt_norecovery, Opt_barrier, Opt_nobarrier,
 80         Opt_inode64, Opt_inode32, Opt_ikeep, Opt_noikeep,
 81         Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2, Opt_filestreams,
 82         Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota, Opt_prjquota,
 83         Opt_uquota, Opt_gquota, Opt_pquota,
 84         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
 85         Opt_discard, Opt_nodiscard, Opt_dax, Opt_err,
 86 };
 87 
 88 static const match_table_t tokens = {
 89         {Opt_logbufs,   "logbufs=%u"},  /* number of XFS log buffers */
 90         {Opt_logbsize,  "logbsize=%s"}, /* size of XFS log buffers */
 91         {Opt_logdev,    "logdev=%s"},   /* log device */
 92         {Opt_rtdev,     "rtdev=%s"},    /* realtime I/O device */
 93         {Opt_biosize,   "biosize=%u"},  /* log2 of preferred buffered io size */
 94         {Opt_wsync,     "wsync"},       /* safe-mode nfs compatible mount */
 95         {Opt_noalign,   "noalign"},     /* turn off stripe alignment */
 96         {Opt_swalloc,   "swalloc"},     /* turn on stripe width allocation */
 97         {Opt_sunit,     "sunit=%u"},    /* data volume stripe unit */
 98         {Opt_swidth,    "swidth=%u"},   /* data volume stripe width */
 99         {Opt_nouuid,    "nouuid"},      /* ignore filesystem UUID */
100         {Opt_mtpt,      "mtpt"},        /* filesystem mount point */
101         {Opt_grpid,     "grpid"},       /* group-ID from parent directory */
102         {Opt_nogrpid,   "nogrpid"},     /* group-ID from current process */
103         {Opt_bsdgroups, "bsdgroups"},   /* group-ID from parent directory */
104         {Opt_sysvgroups,"sysvgroups"},  /* group-ID from current process */
105         {Opt_allocsize, "allocsize=%s"},/* preferred allocation size */
106         {Opt_norecovery,"norecovery"},  /* don't run XFS recovery */
107         {Opt_barrier,   "barrier"},     /* use writer barriers for log write and
108                                          * unwritten extent conversion */
109         {Opt_nobarrier, "nobarrier"},   /* .. disable */
110         {Opt_inode64,   "inode64"},     /* inodes can be allocated anywhere */
111         {Opt_inode32,   "inode32"},     /* inode allocation limited to
112                                          * XFS_MAXINUMBER_32 */
113         {Opt_ikeep,     "ikeep"},       /* do not free empty inode clusters */
114         {Opt_noikeep,   "noikeep"},     /* free empty inode clusters */
115         {Opt_largeio,   "largeio"},     /* report large I/O sizes in stat() */
116         {Opt_nolargeio, "nolargeio"},   /* do not report large I/O sizes
117                                          * in stat(). */
118         {Opt_attr2,     "attr2"},       /* do use attr2 attribute format */
119         {Opt_noattr2,   "noattr2"},     /* do not use attr2 attribute format */
120         {Opt_filestreams,"filestreams"},/* use filestreams allocator */
121         {Opt_quota,     "quota"},       /* disk quotas (user) */
122         {Opt_noquota,   "noquota"},     /* no quotas */
123         {Opt_usrquota,  "usrquota"},    /* user quota enabled */
124         {Opt_grpquota,  "grpquota"},    /* group quota enabled */
125         {Opt_prjquota,  "prjquota"},    /* project quota enabled */
126         {Opt_uquota,    "uquota"},      /* user quota (IRIX variant) */
127         {Opt_gquota,    "gquota"},      /* group quota (IRIX variant) */
128         {Opt_pquota,    "pquota"},      /* project quota (IRIX variant) */
129         {Opt_uqnoenforce,"uqnoenforce"},/* user quota limit enforcement */
130         {Opt_gqnoenforce,"gqnoenforce"},/* group quota limit enforcement */
131         {Opt_pqnoenforce,"pqnoenforce"},/* project quota limit enforcement */
132         {Opt_qnoenforce, "qnoenforce"}, /* same as uqnoenforce */
133         {Opt_discard,   "discard"},     /* Discard unused blocks */
134         {Opt_nodiscard, "nodiscard"},   /* Do not discard unused blocks */
135 
136         {Opt_dax,       "dax"},         /* Enable direct access to bdev pages */
137         {Opt_err,       NULL},
138 };
139 
140 
141 STATIC int
142 suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
143 {
144         int     last, shift_left_factor = 0, _res;
145         char    *value;
146         int     ret = 0;
147 
148         value = match_strdup(s);
149         if (!value)
150                 return -ENOMEM;
151 
152         last = strlen(value) - 1;
153         if (value[last] == 'K' || value[last] == 'k') {
154                 shift_left_factor = 10;
155                 value[last] = '\0';
156         }
157         if (value[last] == 'M' || value[last] == 'm') {
158                 shift_left_factor = 20;
159                 value[last] = '\0';
160         }
161         if (value[last] == 'G' || value[last] == 'g') {
162                 shift_left_factor = 30;
163                 value[last] = '\0';
164         }
165 
166         if (kstrtoint(value, base, &_res))
167                 ret = -EINVAL;
168         kfree(value);
169         *res = _res << shift_left_factor;
170         return ret;
171 }
172 
173 /*
174  * This function fills in xfs_mount_t fields based on mount args.
175  * Note: the superblock has _not_ yet been read in.
176  *
177  * Note that this function leaks the various device name allocations on
178  * failure.  The caller takes care of them.
179  *
180  * *sb is const because this is also used to test options on the remount
181  * path, and we don't want this to have any side effects at remount time.
182  * Today this function does not change *sb, but just to future-proof...
183  */
184 STATIC int
185 xfs_parseargs(
186         struct xfs_mount        *mp,
187         char                    *options)
188 {
189         const struct super_block *sb = mp->m_super;
190         char                    *p;
191         substring_t             args[MAX_OPT_ARGS];
192         int                     dsunit = 0;
193         int                     dswidth = 0;
194         int                     iosize = 0;
195         __uint8_t               iosizelog = 0;
196 
197         /*
198          * set up the mount name first so all the errors will refer to the
199          * correct device.
200          */
201         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
202         if (!mp->m_fsname)
203                 return -ENOMEM;
204         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
205 
206         /*
207          * Copy binary VFS mount flags we are interested in.
208          */
209         if (sb->s_flags & MS_RDONLY)
210                 mp->m_flags |= XFS_MOUNT_RDONLY;
211         if (sb->s_flags & MS_DIRSYNC)
212                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
213         if (sb->s_flags & MS_SYNCHRONOUS)
214                 mp->m_flags |= XFS_MOUNT_WSYNC;
215 
216         /*
217          * Set some default flags that could be cleared by the mount option
218          * parsing.
219          */
220         mp->m_flags |= XFS_MOUNT_BARRIER;
221         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
222 
223         /*
224          * These can be overridden by the mount option parsing.
225          */
226         mp->m_logbufs = -1;
227         mp->m_logbsize = -1;
228 
229         if (!options)
230                 goto done;
231 
232         while ((p = strsep(&options, ",")) != NULL) {
233                 int             token;
234 
235                 if (!*p)
236                         continue;
237 
238                 token = match_token(p, tokens, args);
239                 switch (token) {
240                 case Opt_logbufs:
241                         if (match_int(args, &mp->m_logbufs))
242                                 return -EINVAL;
243                         break;
244                 case Opt_logbsize:
245                         if (suffix_kstrtoint(args, 10, &mp->m_logbsize))
246                                 return -EINVAL;
247                         break;
248                 case Opt_logdev:
249                         mp->m_logname = match_strdup(args);
250                         if (!mp->m_logname)
251                                 return -ENOMEM;
252                         break;
253                 case Opt_mtpt:
254                         xfs_warn(mp, "%s option not allowed on this system", p);
255                         return -EINVAL;
256                 case Opt_rtdev:
257                         mp->m_rtname = match_strdup(args);
258                         if (!mp->m_rtname)
259                                 return -ENOMEM;
260                         break;
261                 case Opt_allocsize:
262                 case Opt_biosize:
263                         if (suffix_kstrtoint(args, 10, &iosize))
264                                 return -EINVAL;
265                         iosizelog = ffs(iosize) - 1;
266                         break;
267                 case Opt_grpid:
268                 case Opt_bsdgroups:
269                         mp->m_flags |= XFS_MOUNT_GRPID;
270                         break;
271                 case Opt_nogrpid:
272                 case Opt_sysvgroups:
273                         mp->m_flags &= ~XFS_MOUNT_GRPID;
274                         break;
275                 case Opt_wsync:
276                         mp->m_flags |= XFS_MOUNT_WSYNC;
277                         break;
278                 case Opt_norecovery:
279                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
280                         break;
281                 case Opt_noalign:
282                         mp->m_flags |= XFS_MOUNT_NOALIGN;
283                         break;
284                 case Opt_swalloc:
285                         mp->m_flags |= XFS_MOUNT_SWALLOC;
286                         break;
287                 case Opt_sunit:
288                         if (match_int(args, &dsunit))
289                                 return -EINVAL;
290                         break;
291                 case Opt_swidth:
292                         if (match_int(args, &dswidth))
293                                 return -EINVAL;
294                         break;
295                 case Opt_inode32:
296                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
297                         break;
298                 case Opt_inode64:
299                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
300                         break;
301                 case Opt_nouuid:
302                         mp->m_flags |= XFS_MOUNT_NOUUID;
303                         break;
304                 case Opt_barrier:
305                         mp->m_flags |= XFS_MOUNT_BARRIER;
306                         break;
307                 case Opt_nobarrier:
308                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
309                         break;
310                 case Opt_ikeep:
311                         mp->m_flags |= XFS_MOUNT_IKEEP;
312                         break;
313                 case Opt_noikeep:
314                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
315                         break;
316                 case Opt_largeio:
317                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
318                         break;
319                 case Opt_nolargeio:
320                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
321                         break;
322                 case Opt_attr2:
323                         mp->m_flags |= XFS_MOUNT_ATTR2;
324                         break;
325                 case Opt_noattr2:
326                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
327                         mp->m_flags |= XFS_MOUNT_NOATTR2;
328                         break;
329                 case Opt_filestreams:
330                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
331                         break;
332                 case Opt_noquota:
333                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
334                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
335                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
336                         break;
337                 case Opt_quota:
338                 case Opt_uquota:
339                 case Opt_usrquota:
340                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
341                                          XFS_UQUOTA_ENFD);
342                         break;
343                 case Opt_qnoenforce:
344                 case Opt_uqnoenforce:
345                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
346                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
347                         break;
348                 case Opt_pquota:
349                 case Opt_prjquota:
350                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
351                                          XFS_PQUOTA_ENFD);
352                         break;
353                 case Opt_pqnoenforce:
354                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
355                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
356                         break;
357                 case Opt_gquota:
358                 case Opt_grpquota:
359                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
360                                          XFS_GQUOTA_ENFD);
361                         break;
362                 case Opt_gqnoenforce:
363                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
364                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
365                         break;
366                 case Opt_discard:
367                         mp->m_flags |= XFS_MOUNT_DISCARD;
368                         break;
369                 case Opt_nodiscard:
370                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
371                         break;
372 #ifdef CONFIG_FS_DAX
373                 case Opt_dax:
374                         mp->m_flags |= XFS_MOUNT_DAX;
375                         break;
376 #endif
377                 default:
378                         xfs_warn(mp, "unknown mount option [%s].", p);
379                         return -EINVAL;
380                 }
381         }
382 
383         /*
384          * no recovery flag requires a read-only mount
385          */
386         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
387             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
388                 xfs_warn(mp, "no-recovery mounts must be read-only.");
389                 return -EINVAL;
390         }
391 
392         if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
393                 xfs_warn(mp,
394         "sunit and swidth options incompatible with the noalign option");
395                 return -EINVAL;
396         }
397 
398 #ifndef CONFIG_XFS_QUOTA
399         if (XFS_IS_QUOTA_RUNNING(mp)) {
400                 xfs_warn(mp, "quota support not available in this kernel.");
401                 return -EINVAL;
402         }
403 #endif
404 
405         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
406                 xfs_warn(mp, "sunit and swidth must be specified together");
407                 return -EINVAL;
408         }
409 
410         if (dsunit && (dswidth % dsunit != 0)) {
411                 xfs_warn(mp,
412         "stripe width (%d) must be a multiple of the stripe unit (%d)",
413                         dswidth, dsunit);
414                 return -EINVAL;
415         }
416 
417 done:
418         if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
419                 /*
420                  * At this point the superblock has not been read
421                  * in, therefore we do not know the block size.
422                  * Before the mount call ends we will convert
423                  * these to FSBs.
424                  */
425                 mp->m_dalign = dsunit;
426                 mp->m_swidth = dswidth;
427         }
428 
429         if (mp->m_logbufs != -1 &&
430             mp->m_logbufs != 0 &&
431             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
432              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
433                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
434                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
435                 return -EINVAL;
436         }
437         if (mp->m_logbsize != -1 &&
438             mp->m_logbsize !=  0 &&
439             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
440              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
441              !is_power_of_2(mp->m_logbsize))) {
442                 xfs_warn(mp,
443                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
444                         mp->m_logbsize);
445                 return -EINVAL;
446         }
447 
448         if (iosizelog) {
449                 if (iosizelog > XFS_MAX_IO_LOG ||
450                     iosizelog < XFS_MIN_IO_LOG) {
451                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
452                                 iosizelog, XFS_MIN_IO_LOG,
453                                 XFS_MAX_IO_LOG);
454                         return -EINVAL;
455                 }
456 
457                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
458                 mp->m_readio_log = iosizelog;
459                 mp->m_writeio_log = iosizelog;
460         }
461 
462         return 0;
463 }
464 
465 struct proc_xfs_info {
466         uint64_t        flag;
467         char            *str;
468 };
469 
470 STATIC int
471 xfs_showargs(
472         struct xfs_mount        *mp,
473         struct seq_file         *m)
474 {
475         static struct proc_xfs_info xfs_info_set[] = {
476                 /* the few simple ones we can get from the mount struct */
477                 { XFS_MOUNT_IKEEP,              ",ikeep" },
478                 { XFS_MOUNT_WSYNC,              ",wsync" },
479                 { XFS_MOUNT_NOALIGN,            ",noalign" },
480                 { XFS_MOUNT_SWALLOC,            ",swalloc" },
481                 { XFS_MOUNT_NOUUID,             ",nouuid" },
482                 { XFS_MOUNT_NORECOVERY,         ",norecovery" },
483                 { XFS_MOUNT_ATTR2,              ",attr2" },
484                 { XFS_MOUNT_FILESTREAMS,        ",filestreams" },
485                 { XFS_MOUNT_GRPID,              ",grpid" },
486                 { XFS_MOUNT_DISCARD,            ",discard" },
487                 { XFS_MOUNT_SMALL_INUMS,        ",inode32" },
488                 { XFS_MOUNT_DAX,                ",dax" },
489                 { 0, NULL }
490         };
491         static struct proc_xfs_info xfs_info_unset[] = {
492                 /* the few simple ones we can get from the mount struct */
493                 { XFS_MOUNT_COMPAT_IOSIZE,      ",largeio" },
494                 { XFS_MOUNT_BARRIER,            ",nobarrier" },
495                 { XFS_MOUNT_SMALL_INUMS,        ",inode64" },
496                 { 0, NULL }
497         };
498         struct proc_xfs_info    *xfs_infop;
499 
500         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
501                 if (mp->m_flags & xfs_infop->flag)
502                         seq_puts(m, xfs_infop->str);
503         }
504         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
505                 if (!(mp->m_flags & xfs_infop->flag))
506                         seq_puts(m, xfs_infop->str);
507         }
508 
509         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
510                 seq_printf(m, ",allocsize=%dk",
511                                 (int)(1 << mp->m_writeio_log) >> 10);
512 
513         if (mp->m_logbufs > 0)
514                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
515         if (mp->m_logbsize > 0)
516                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
517 
518         if (mp->m_logname)
519                 seq_show_option(m, "logdev", mp->m_logname);
520         if (mp->m_rtname)
521                 seq_show_option(m, "rtdev", mp->m_rtname);
522 
523         if (mp->m_dalign > 0)
524                 seq_printf(m, ",sunit=%d",
525                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
526         if (mp->m_swidth > 0)
527                 seq_printf(m, ",swidth=%d",
528                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
529 
530         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
531                 seq_puts(m, ",usrquota");
532         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
533                 seq_puts(m, ",uqnoenforce");
534 
535         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
536                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
537                         seq_puts(m, ",prjquota");
538                 else
539                         seq_puts(m, ",pqnoenforce");
540         }
541         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
542                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
543                         seq_puts(m, ",grpquota");
544                 else
545                         seq_puts(m, ",gqnoenforce");
546         }
547 
548         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
549                 seq_puts(m, ",noquota");
550 
551         return 0;
552 }
553 static __uint64_t
554 xfs_max_file_offset(
555         unsigned int            blockshift)
556 {
557         unsigned int            pagefactor = 1;
558         unsigned int            bitshift = BITS_PER_LONG - 1;
559 
560         /* Figure out maximum filesize, on Linux this can depend on
561          * the filesystem blocksize (on 32 bit platforms).
562          * __block_write_begin does this in an [unsigned] long...
563          *      page->index << (PAGE_SHIFT - bbits)
564          * So, for page sized blocks (4K on 32 bit platforms),
565          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
566          *      (((u64)PAGE_SIZE << (BITS_PER_LONG-1))-1)
567          * but for smaller blocksizes it is less (bbits = log2 bsize).
568          * Note1: get_block_t takes a long (implicit cast from above)
569          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
570          * can optionally convert the [unsigned] long from above into
571          * an [unsigned] long long.
572          */
573 
574 #if BITS_PER_LONG == 32
575 # if defined(CONFIG_LBDAF)
576         ASSERT(sizeof(sector_t) == 8);
577         pagefactor = PAGE_SIZE;
578         bitshift = BITS_PER_LONG;
579 # else
580         pagefactor = PAGE_SIZE >> (PAGE_SHIFT - blockshift);
581 # endif
582 #endif
583 
584         return (((__uint64_t)pagefactor) << bitshift) - 1;
585 }
586 
587 /*
588  * Set parameters for inode allocation heuristics, taking into account
589  * filesystem size and inode32/inode64 mount options; i.e. specifically
590  * whether or not XFS_MOUNT_SMALL_INUMS is set.
591  *
592  * Inode allocation patterns are altered only if inode32 is requested
593  * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
594  * If altered, XFS_MOUNT_32BITINODES is set as well.
595  *
596  * An agcount independent of that in the mount structure is provided
597  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
598  * to the potentially higher ag count.
599  *
600  * Returns the maximum AG index which may contain inodes.
601  */
602 xfs_agnumber_t
603 xfs_set_inode_alloc(
604         struct xfs_mount *mp,
605         xfs_agnumber_t  agcount)
606 {
607         xfs_agnumber_t  index;
608         xfs_agnumber_t  maxagi = 0;
609         xfs_sb_t        *sbp = &mp->m_sb;
610         xfs_agnumber_t  max_metadata;
611         xfs_agino_t     agino;
612         xfs_ino_t       ino;
613 
614         /*
615          * Calculate how much should be reserved for inodes to meet
616          * the max inode percentage.  Used only for inode32.
617          */
618         if (mp->m_maxicount) {
619                 __uint64_t      icount;
620 
621                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
622                 do_div(icount, 100);
623                 icount += sbp->sb_agblocks - 1;
624                 do_div(icount, sbp->sb_agblocks);
625                 max_metadata = icount;
626         } else {
627                 max_metadata = agcount;
628         }
629 
630         /* Get the last possible inode in the filesystem */
631         agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
632         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
633 
634         /*
635          * If user asked for no more than 32-bit inodes, and the fs is
636          * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
637          * the allocator to accommodate the request.
638          */
639         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
640                 mp->m_flags |= XFS_MOUNT_32BITINODES;
641         else
642                 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
643 
644         for (index = 0; index < agcount; index++) {
645                 struct xfs_perag        *pag;
646 
647                 ino = XFS_AGINO_TO_INO(mp, index, agino);
648 
649                 pag = xfs_perag_get(mp, index);
650 
651                 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
652                         if (ino > XFS_MAXINUMBER_32) {
653                                 pag->pagi_inodeok = 0;
654                                 pag->pagf_metadata = 0;
655                         } else {
656                                 pag->pagi_inodeok = 1;
657                                 maxagi++;
658                                 if (index < max_metadata)
659                                         pag->pagf_metadata = 1;
660                                 else
661                                         pag->pagf_metadata = 0;
662                         }
663                 } else {
664                         pag->pagi_inodeok = 1;
665                         pag->pagf_metadata = 0;
666                 }
667 
668                 xfs_perag_put(pag);
669         }
670 
671         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
672 }
673 
674 STATIC int
675 xfs_blkdev_get(
676         xfs_mount_t             *mp,
677         const char              *name,
678         struct block_device     **bdevp)
679 {
680         int                     error = 0;
681 
682         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
683                                     mp);
684         if (IS_ERR(*bdevp)) {
685                 error = PTR_ERR(*bdevp);
686                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
687         }
688 
689         return error;
690 }
691 
692 STATIC void
693 xfs_blkdev_put(
694         struct block_device     *bdev)
695 {
696         if (bdev)
697                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
698 }
699 
700 void
701 xfs_blkdev_issue_flush(
702         xfs_buftarg_t           *buftarg)
703 {
704         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
705 }
706 
707 STATIC void
708 xfs_close_devices(
709         struct xfs_mount        *mp)
710 {
711         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
712                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
713                 xfs_free_buftarg(mp, mp->m_logdev_targp);
714                 xfs_blkdev_put(logdev);
715         }
716         if (mp->m_rtdev_targp) {
717                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
718                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
719                 xfs_blkdev_put(rtdev);
720         }
721         xfs_free_buftarg(mp, mp->m_ddev_targp);
722 }
723 
724 /*
725  * The file system configurations are:
726  *      (1) device (partition) with data and internal log
727  *      (2) logical volume with data and log subvolumes.
728  *      (3) logical volume with data, log, and realtime subvolumes.
729  *
730  * We only have to handle opening the log and realtime volumes here if
731  * they are present.  The data subvolume has already been opened by
732  * get_sb_bdev() and is stored in sb->s_bdev.
733  */
734 STATIC int
735 xfs_open_devices(
736         struct xfs_mount        *mp)
737 {
738         struct block_device     *ddev = mp->m_super->s_bdev;
739         struct block_device     *logdev = NULL, *rtdev = NULL;
740         int                     error;
741 
742         /*
743          * Open real time and log devices - order is important.
744          */
745         if (mp->m_logname) {
746                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
747                 if (error)
748                         goto out;
749         }
750 
751         if (mp->m_rtname) {
752                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
753                 if (error)
754                         goto out_close_logdev;
755 
756                 if (rtdev == ddev || rtdev == logdev) {
757                         xfs_warn(mp,
758         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
759                         error = -EINVAL;
760                         goto out_close_rtdev;
761                 }
762         }
763 
764         /*
765          * Setup xfs_mount buffer target pointers
766          */
767         error = -ENOMEM;
768         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev);
769         if (!mp->m_ddev_targp)
770                 goto out_close_rtdev;
771 
772         if (rtdev) {
773                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev);
774                 if (!mp->m_rtdev_targp)
775                         goto out_free_ddev_targ;
776         }
777 
778         if (logdev && logdev != ddev) {
779                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
780                 if (!mp->m_logdev_targp)
781                         goto out_free_rtdev_targ;
782         } else {
783                 mp->m_logdev_targp = mp->m_ddev_targp;
784         }
785 
786         return 0;
787 
788  out_free_rtdev_targ:
789         if (mp->m_rtdev_targp)
790                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
791  out_free_ddev_targ:
792         xfs_free_buftarg(mp, mp->m_ddev_targp);
793  out_close_rtdev:
794         xfs_blkdev_put(rtdev);
795  out_close_logdev:
796         if (logdev && logdev != ddev)
797                 xfs_blkdev_put(logdev);
798  out:
799         return error;
800 }
801 
802 /*
803  * Setup xfs_mount buffer target pointers based on superblock
804  */
805 STATIC int
806 xfs_setup_devices(
807         struct xfs_mount        *mp)
808 {
809         int                     error;
810 
811         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
812         if (error)
813                 return error;
814 
815         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
816                 unsigned int    log_sector_size = BBSIZE;
817 
818                 if (xfs_sb_version_hassector(&mp->m_sb))
819                         log_sector_size = mp->m_sb.sb_logsectsize;
820                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
821                                             log_sector_size);
822                 if (error)
823                         return error;
824         }
825         if (mp->m_rtdev_targp) {
826                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
827                                             mp->m_sb.sb_sectsize);
828                 if (error)
829                         return error;
830         }
831 
832         return 0;
833 }
834 
835 STATIC int
836 xfs_init_mount_workqueues(
837         struct xfs_mount        *mp)
838 {
839         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
840                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
841         if (!mp->m_buf_workqueue)
842                 goto out;
843 
844         mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
845                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
846         if (!mp->m_data_workqueue)
847                 goto out_destroy_buf;
848 
849         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
850                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
851         if (!mp->m_unwritten_workqueue)
852                 goto out_destroy_data_iodone_queue;
853 
854         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
855                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
856         if (!mp->m_cil_workqueue)
857                 goto out_destroy_unwritten;
858 
859         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
860                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
861         if (!mp->m_reclaim_workqueue)
862                 goto out_destroy_cil;
863 
864         mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
865                         WQ_MEM_RECLAIM|WQ_FREEZABLE|WQ_HIGHPRI, 0,
866                         mp->m_fsname);
867         if (!mp->m_log_workqueue)
868                 goto out_destroy_reclaim;
869 
870         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
871                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
872         if (!mp->m_eofblocks_workqueue)
873                 goto out_destroy_log;
874 
875         return 0;
876 
877 out_destroy_log:
878         destroy_workqueue(mp->m_log_workqueue);
879 out_destroy_reclaim:
880         destroy_workqueue(mp->m_reclaim_workqueue);
881 out_destroy_cil:
882         destroy_workqueue(mp->m_cil_workqueue);
883 out_destroy_unwritten:
884         destroy_workqueue(mp->m_unwritten_workqueue);
885 out_destroy_data_iodone_queue:
886         destroy_workqueue(mp->m_data_workqueue);
887 out_destroy_buf:
888         destroy_workqueue(mp->m_buf_workqueue);
889 out:
890         return -ENOMEM;
891 }
892 
893 STATIC void
894 xfs_destroy_mount_workqueues(
895         struct xfs_mount        *mp)
896 {
897         destroy_workqueue(mp->m_eofblocks_workqueue);
898         destroy_workqueue(mp->m_log_workqueue);
899         destroy_workqueue(mp->m_reclaim_workqueue);
900         destroy_workqueue(mp->m_cil_workqueue);
901         destroy_workqueue(mp->m_data_workqueue);
902         destroy_workqueue(mp->m_unwritten_workqueue);
903         destroy_workqueue(mp->m_buf_workqueue);
904 }
905 
906 /*
907  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
908  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
909  * for IO to complete so that we effectively throttle multiple callers to the
910  * rate at which IO is completing.
911  */
912 void
913 xfs_flush_inodes(
914         struct xfs_mount        *mp)
915 {
916         struct super_block      *sb = mp->m_super;
917 
918         if (down_read_trylock(&sb->s_umount)) {
919                 sync_inodes_sb(sb);
920                 up_read(&sb->s_umount);
921         }
922 }
923 
924 /* Catch misguided souls that try to use this interface on XFS */
925 STATIC struct inode *
926 xfs_fs_alloc_inode(
927         struct super_block      *sb)
928 {
929         BUG();
930         return NULL;
931 }
932 
933 /*
934  * Now that the generic code is guaranteed not to be accessing
935  * the linux inode, we can inactivate and reclaim the inode.
936  */
937 STATIC void
938 xfs_fs_destroy_inode(
939         struct inode            *inode)
940 {
941         struct xfs_inode        *ip = XFS_I(inode);
942         int                     error;
943 
944         trace_xfs_destroy_inode(ip);
945 
946         ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
947         XFS_STATS_INC(ip->i_mount, vn_rele);
948         XFS_STATS_INC(ip->i_mount, vn_remove);
949 
950         if (xfs_is_reflink_inode(ip)) {
951                 error = xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF);
952                 if (error && !XFS_FORCED_SHUTDOWN(ip->i_mount))
953                         xfs_warn(ip->i_mount,
954 "Error %d while evicting CoW blocks for inode %llu.",
955                                         error, ip->i_ino);
956         }
957 
958         xfs_inactive(ip);
959 
960         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
961         XFS_STATS_INC(ip->i_mount, vn_reclaim);
962 
963         /*
964          * We should never get here with one of the reclaim flags already set.
965          */
966         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
967         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
968 
969         /*
970          * We always use background reclaim here because even if the
971          * inode is clean, it still may be under IO and hence we have
972          * to take the flush lock. The background reclaim path handles
973          * this more efficiently than we can here, so simply let background
974          * reclaim tear down all inodes.
975          */
976         xfs_inode_set_reclaim_tag(ip);
977 }
978 
979 /*
980  * Slab object creation initialisation for the XFS inode.
981  * This covers only the idempotent fields in the XFS inode;
982  * all other fields need to be initialised on allocation
983  * from the slab. This avoids the need to repeatedly initialise
984  * fields in the xfs inode that left in the initialise state
985  * when freeing the inode.
986  */
987 STATIC void
988 xfs_fs_inode_init_once(
989         void                    *inode)
990 {
991         struct xfs_inode        *ip = inode;
992 
993         memset(ip, 0, sizeof(struct xfs_inode));
994 
995         /* vfs inode */
996         inode_init_once(VFS_I(ip));
997 
998         /* xfs inode */
999         atomic_set(&ip->i_pincount, 0);
1000         spin_lock_init(&ip->i_flags_lock);
1001 
1002         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1003                      "xfsino", ip->i_ino);
1004         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1005                      "xfsino", ip->i_ino);
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         /*
1022          * If this unlinked inode is in the middle of recovery, don't
1023          * drop the inode just yet; log recovery will take care of
1024          * that.  See the comment for this inode flag.
1025          */
1026         if (ip->i_flags & XFS_IRECOVERY) {
1027                 ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED);
1028                 return 0;
1029         }
1030 
1031         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1032 }
1033 
1034 STATIC void
1035 xfs_free_fsname(
1036         struct xfs_mount        *mp)
1037 {
1038         kfree(mp->m_fsname);
1039         kfree(mp->m_rtname);
1040         kfree(mp->m_logname);
1041 }
1042 
1043 STATIC int
1044 xfs_fs_sync_fs(
1045         struct super_block      *sb,
1046         int                     wait)
1047 {
1048         struct xfs_mount        *mp = XFS_M(sb);
1049 
1050         /*
1051          * Doing anything during the async pass would be counterproductive.
1052          */
1053         if (!wait)
1054                 return 0;
1055 
1056         xfs_log_force(mp, XFS_LOG_SYNC);
1057         if (laptop_mode) {
1058                 /*
1059                  * The disk must be active because we're syncing.
1060                  * We schedule log work now (now that the disk is
1061                  * active) instead of later (when it might not be).
1062                  */
1063                 flush_delayed_work(&mp->m_log->l_work);
1064         }
1065 
1066         return 0;
1067 }
1068 
1069 STATIC int
1070 xfs_fs_statfs(
1071         struct dentry           *dentry,
1072         struct kstatfs          *statp)
1073 {
1074         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1075         xfs_sb_t                *sbp = &mp->m_sb;
1076         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
1077         __uint64_t              fakeinos, id;
1078         __uint64_t              icount;
1079         __uint64_t              ifree;
1080         __uint64_t              fdblocks;
1081         xfs_extlen_t            lsize;
1082         __int64_t               ffree;
1083 
1084         statp->f_type = XFS_SB_MAGIC;
1085         statp->f_namelen = MAXNAMELEN - 1;
1086 
1087         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1088         statp->f_fsid.val[0] = (u32)id;
1089         statp->f_fsid.val[1] = (u32)(id >> 32);
1090 
1091         icount = percpu_counter_sum(&mp->m_icount);
1092         ifree = percpu_counter_sum(&mp->m_ifree);
1093         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1094 
1095         spin_lock(&mp->m_sb_lock);
1096         statp->f_bsize = sbp->sb_blocksize;
1097         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1098         statp->f_blocks = sbp->sb_dblocks - lsize;
1099         spin_unlock(&mp->m_sb_lock);
1100 
1101         statp->f_bfree = fdblocks - mp->m_alloc_set_aside;
1102         statp->f_bavail = statp->f_bfree;
1103 
1104         fakeinos = statp->f_bfree << sbp->sb_inopblog;
1105         statp->f_files = MIN(icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1106         if (mp->m_maxicount)
1107                 statp->f_files = min_t(typeof(statp->f_files),
1108                                         statp->f_files,
1109                                         mp->m_maxicount);
1110 
1111         /* If sb_icount overshot maxicount, report actual allocation */
1112         statp->f_files = max_t(typeof(statp->f_files),
1113                                         statp->f_files,
1114                                         sbp->sb_icount);
1115 
1116         /* make sure statp->f_ffree does not underflow */
1117         ffree = statp->f_files - (icount - ifree);
1118         statp->f_ffree = max_t(__int64_t, ffree, 0);
1119 
1120 
1121         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1122             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1123                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1124                 xfs_qm_statvfs(ip, statp);
1125         return 0;
1126 }
1127 
1128 STATIC void
1129 xfs_save_resvblks(struct xfs_mount *mp)
1130 {
1131         __uint64_t resblks = 0;
1132 
1133         mp->m_resblks_save = mp->m_resblks;
1134         xfs_reserve_blocks(mp, &resblks, NULL);
1135 }
1136 
1137 STATIC void
1138 xfs_restore_resvblks(struct xfs_mount *mp)
1139 {
1140         __uint64_t resblks;
1141 
1142         if (mp->m_resblks_save) {
1143                 resblks = mp->m_resblks_save;
1144                 mp->m_resblks_save = 0;
1145         } else
1146                 resblks = xfs_default_resblks(mp);
1147 
1148         xfs_reserve_blocks(mp, &resblks, NULL);
1149 }
1150 
1151 /*
1152  * Trigger writeback of all the dirty metadata in the file system.
1153  *
1154  * This ensures that the metadata is written to their location on disk rather
1155  * than just existing in transactions in the log. This means after a quiesce
1156  * there is no log replay required to write the inodes to disk - this is the
1157  * primary difference between a sync and a quiesce.
1158  *
1159  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1160  * it is started again when appropriate.
1161  */
1162 void
1163 xfs_quiesce_attr(
1164         struct xfs_mount        *mp)
1165 {
1166         int     error = 0;
1167 
1168         /* wait for all modifications to complete */
1169         while (atomic_read(&mp->m_active_trans) > 0)
1170                 delay(100);
1171 
1172         /* force the log to unpin objects from the now complete transactions */
1173         xfs_log_force(mp, XFS_LOG_SYNC);
1174 
1175         /* reclaim inodes to do any IO before the freeze completes */
1176         xfs_reclaim_inodes(mp, 0);
1177         xfs_reclaim_inodes(mp, SYNC_WAIT);
1178 
1179         /* Push the superblock and write an unmount record */
1180         error = xfs_log_sbcount(mp);
1181         if (error)
1182                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1183                                 "Frozen image may not be consistent.");
1184         /*
1185          * Just warn here till VFS can correctly support
1186          * read-only remount without racing.
1187          */
1188         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1189 
1190         xfs_log_quiesce(mp);
1191 }
1192 
1193 STATIC int
1194 xfs_test_remount_options(
1195         struct super_block      *sb,
1196         struct xfs_mount        *mp,
1197         char                    *options)
1198 {
1199         int                     error = 0;
1200         struct xfs_mount        *tmp_mp;
1201 
1202         tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL);
1203         if (!tmp_mp)
1204                 return -ENOMEM;
1205 
1206         tmp_mp->m_super = sb;
1207         error = xfs_parseargs(tmp_mp, options);
1208         xfs_free_fsname(tmp_mp);
1209         kfree(tmp_mp);
1210 
1211         return error;
1212 }
1213 
1214 STATIC int
1215 xfs_fs_remount(
1216         struct super_block      *sb,
1217         int                     *flags,
1218         char                    *options)
1219 {
1220         struct xfs_mount        *mp = XFS_M(sb);
1221         xfs_sb_t                *sbp = &mp->m_sb;
1222         substring_t             args[MAX_OPT_ARGS];
1223         char                    *p;
1224         int                     error;
1225 
1226         /* First, check for complete junk; i.e. invalid options */
1227         error = xfs_test_remount_options(sb, mp, options);
1228         if (error)
1229                 return error;
1230 
1231         sync_filesystem(sb);
1232         while ((p = strsep(&options, ",")) != NULL) {
1233                 int token;
1234 
1235                 if (!*p)
1236                         continue;
1237 
1238                 token = match_token(p, tokens, args);
1239                 switch (token) {
1240                 case Opt_barrier:
1241                         mp->m_flags |= XFS_MOUNT_BARRIER;
1242                         break;
1243                 case Opt_nobarrier:
1244                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
1245                         break;
1246                 case Opt_inode64:
1247                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1248                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1249                         break;
1250                 case Opt_inode32:
1251                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1252                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1253                         break;
1254                 default:
1255                         /*
1256                          * Logically we would return an error here to prevent
1257                          * users from believing they might have changed
1258                          * mount options using remount which can't be changed.
1259                          *
1260                          * But unfortunately mount(8) adds all options from
1261                          * mtab and fstab to the mount arguments in some cases
1262                          * so we can't blindly reject options, but have to
1263                          * check for each specified option if it actually
1264                          * differs from the currently set option and only
1265                          * reject it if that's the case.
1266                          *
1267                          * Until that is implemented we return success for
1268                          * every remount request, and silently ignore all
1269                          * options that we can't actually change.
1270                          */
1271 #if 0
1272                         xfs_info(mp,
1273                 "mount option \"%s\" not supported for remount", p);
1274                         return -EINVAL;
1275 #else
1276                         break;
1277 #endif
1278                 }
1279         }
1280 
1281         /* ro -> rw */
1282         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1283                 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1284                         xfs_warn(mp,
1285                 "ro->rw transition prohibited on norecovery mount");
1286                         return -EINVAL;
1287                 }
1288 
1289                 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1290                     xfs_sb_has_ro_compat_feature(sbp,
1291                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1292                         xfs_warn(mp,
1293 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1294                                 (sbp->sb_features_ro_compat &
1295                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1296                         return -EINVAL;
1297                 }
1298 
1299                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1300 
1301                 /*
1302                  * If this is the first remount to writeable state we
1303                  * might have some superblock changes to update.
1304                  */
1305                 if (mp->m_update_sb) {
1306                         error = xfs_sync_sb(mp, false);
1307                         if (error) {
1308                                 xfs_warn(mp, "failed to write sb changes");
1309                                 return error;
1310                         }
1311                         mp->m_update_sb = false;
1312                 }
1313 
1314                 /*
1315                  * Fill out the reserve pool if it is empty. Use the stashed
1316                  * value if it is non-zero, otherwise go with the default.
1317                  */
1318                 xfs_restore_resvblks(mp);
1319                 xfs_log_work_queue(mp);
1320                 xfs_queue_eofblocks(mp);
1321 
1322                 /* Recover any CoW blocks that never got remapped. */
1323                 error = xfs_reflink_recover_cow(mp);
1324                 if (error) {
1325                         xfs_err(mp,
1326         "Error %d recovering leftover CoW allocations.", error);
1327                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1328                         return error;
1329                 }
1330 
1331                 /* Create the per-AG metadata reservation pool .*/
1332                 error = xfs_fs_reserve_ag_blocks(mp);
1333                 if (error && error != -ENOSPC)
1334                         return error;
1335         }
1336 
1337         /* rw -> ro */
1338         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1339                 /* Free the per-AG metadata reservation pool. */
1340                 error = xfs_fs_unreserve_ag_blocks(mp);
1341                 if (error) {
1342                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1343                         return error;
1344                 }
1345 
1346                 /*
1347                  * Before we sync the metadata, we need to free up the reserve
1348                  * block pool so that the used block count in the superblock on
1349                  * disk is correct at the end of the remount. Stash the current
1350                  * reserve pool size so that if we get remounted rw, we can
1351                  * return it to the same size.
1352                  */
1353                 xfs_save_resvblks(mp);
1354 
1355                 /*
1356                  * Cancel background eofb scanning so it cannot race with the
1357                  * final log force+buftarg wait and deadlock the remount.
1358                  */
1359                 cancel_delayed_work_sync(&mp->m_eofblocks_work);
1360 
1361                 xfs_quiesce_attr(mp);
1362                 mp->m_flags |= XFS_MOUNT_RDONLY;
1363         }
1364 
1365         return 0;
1366 }
1367 
1368 /*
1369  * Second stage of a freeze. The data is already frozen so we only
1370  * need to take care of the metadata. Once that's done sync the superblock
1371  * to the log to dirty it in case of a crash while frozen. This ensures that we
1372  * will recover the unlinked inode lists on the next mount.
1373  */
1374 STATIC int
1375 xfs_fs_freeze(
1376         struct super_block      *sb)
1377 {
1378         struct xfs_mount        *mp = XFS_M(sb);
1379 
1380         xfs_save_resvblks(mp);
1381         xfs_quiesce_attr(mp);
1382         return xfs_sync_sb(mp, true);
1383 }
1384 
1385 STATIC int
1386 xfs_fs_unfreeze(
1387         struct super_block      *sb)
1388 {
1389         struct xfs_mount        *mp = XFS_M(sb);
1390 
1391         xfs_restore_resvblks(mp);
1392         xfs_log_work_queue(mp);
1393         return 0;
1394 }
1395 
1396 STATIC int
1397 xfs_fs_show_options(
1398         struct seq_file         *m,
1399         struct dentry           *root)
1400 {
1401         return xfs_showargs(XFS_M(root->d_sb), m);
1402 }
1403 
1404 /*
1405  * This function fills in xfs_mount_t fields based on mount args.
1406  * Note: the superblock _has_ now been read in.
1407  */
1408 STATIC int
1409 xfs_finish_flags(
1410         struct xfs_mount        *mp)
1411 {
1412         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1413 
1414         /* Fail a mount where the logbuf is smaller than the log stripe */
1415         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1416                 if (mp->m_logbsize <= 0 &&
1417                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1418                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1419                 } else if (mp->m_logbsize > 0 &&
1420                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1421                         xfs_warn(mp,
1422                 "logbuf size must be greater than or equal to log stripe size");
1423                         return -EINVAL;
1424                 }
1425         } else {
1426                 /* Fail a mount if the logbuf is larger than 32K */
1427                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1428                         xfs_warn(mp,
1429                 "logbuf size for version 1 logs must be 16K or 32K");
1430                         return -EINVAL;
1431                 }
1432         }
1433 
1434         /*
1435          * V5 filesystems always use attr2 format for attributes.
1436          */
1437         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1438             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1439                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
1440                              "attr2 is always enabled for V5 filesystems.");
1441                 return -EINVAL;
1442         }
1443 
1444         /*
1445          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1446          * told by noattr2 to turn it off
1447          */
1448         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1449             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1450                 mp->m_flags |= XFS_MOUNT_ATTR2;
1451 
1452         /*
1453          * prohibit r/w mounts of read-only filesystems
1454          */
1455         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1456                 xfs_warn(mp,
1457                         "cannot mount a read-only filesystem as read-write");
1458                 return -EROFS;
1459         }
1460 
1461         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1462             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1463             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1464                 xfs_warn(mp,
1465                   "Super block does not support project and group quota together");
1466                 return -EINVAL;
1467         }
1468 
1469         return 0;
1470 }
1471 
1472 static int
1473 xfs_init_percpu_counters(
1474         struct xfs_mount        *mp)
1475 {
1476         int             error;
1477 
1478         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1479         if (error)
1480                 return -ENOMEM;
1481 
1482         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1483         if (error)
1484                 goto free_icount;
1485 
1486         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1487         if (error)
1488                 goto free_ifree;
1489 
1490         return 0;
1491 
1492 free_ifree:
1493         percpu_counter_destroy(&mp->m_ifree);
1494 free_icount:
1495         percpu_counter_destroy(&mp->m_icount);
1496         return -ENOMEM;
1497 }
1498 
1499 void
1500 xfs_reinit_percpu_counters(
1501         struct xfs_mount        *mp)
1502 {
1503         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1504         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1505         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1506 }
1507 
1508 static void
1509 xfs_destroy_percpu_counters(
1510         struct xfs_mount        *mp)
1511 {
1512         percpu_counter_destroy(&mp->m_icount);
1513         percpu_counter_destroy(&mp->m_ifree);
1514         percpu_counter_destroy(&mp->m_fdblocks);
1515 }
1516 
1517 STATIC int
1518 xfs_fs_fill_super(
1519         struct super_block      *sb,
1520         void                    *data,
1521         int                     silent)
1522 {
1523         struct inode            *root;
1524         struct xfs_mount        *mp = NULL;
1525         int                     flags = 0, error = -ENOMEM;
1526 
1527         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1528         if (!mp)
1529                 goto out;
1530 
1531         spin_lock_init(&mp->m_sb_lock);
1532         mutex_init(&mp->m_growlock);
1533         atomic_set(&mp->m_active_trans, 0);
1534         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1535         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1536         INIT_DELAYED_WORK(&mp->m_cowblocks_work, xfs_cowblocks_worker);
1537         mp->m_kobj.kobject.kset = xfs_kset;
1538 
1539         mp->m_super = sb;
1540         sb->s_fs_info = mp;
1541 
1542         error = xfs_parseargs(mp, (char *)data);
1543         if (error)
1544                 goto out_free_fsname;
1545 
1546         sb_min_blocksize(sb, BBSIZE);
1547         sb->s_xattr = xfs_xattr_handlers;
1548         sb->s_export_op = &xfs_export_operations;
1549 #ifdef CONFIG_XFS_QUOTA
1550         sb->s_qcop = &xfs_quotactl_operations;
1551         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1552 #endif
1553         sb->s_op = &xfs_super_operations;
1554 
1555         if (silent)
1556                 flags |= XFS_MFSI_QUIET;
1557 
1558         error = xfs_open_devices(mp);
1559         if (error)
1560                 goto out_free_fsname;
1561 
1562         error = xfs_init_mount_workqueues(mp);
1563         if (error)
1564                 goto out_close_devices;
1565 
1566         error = xfs_init_percpu_counters(mp);
1567         if (error)
1568                 goto out_destroy_workqueues;
1569 
1570         /* Allocate stats memory before we do operations that might use it */
1571         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1572         if (!mp->m_stats.xs_stats) {
1573                 error = -ENOMEM;
1574                 goto out_destroy_counters;
1575         }
1576 
1577         error = xfs_readsb(mp, flags);
1578         if (error)
1579                 goto out_free_stats;
1580 
1581         error = xfs_finish_flags(mp);
1582         if (error)
1583                 goto out_free_sb;
1584 
1585         error = xfs_setup_devices(mp);
1586         if (error)
1587                 goto out_free_sb;
1588 
1589         error = xfs_filestream_mount(mp);
1590         if (error)
1591                 goto out_free_sb;
1592 
1593         /*
1594          * we must configure the block size in the superblock before we run the
1595          * full mount process as the mount process can lookup and cache inodes.
1596          */
1597         sb->s_magic = XFS_SB_MAGIC;
1598         sb->s_blocksize = mp->m_sb.sb_blocksize;
1599         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1600         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1601         sb->s_max_links = XFS_MAXLINK;
1602         sb->s_time_gran = 1;
1603         set_posix_acl_flag(sb);
1604 
1605         /* version 5 superblocks support inode version counters. */
1606         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1607                 sb->s_flags |= MS_I_VERSION;
1608 
1609         if (mp->m_flags & XFS_MOUNT_DAX) {
1610                 xfs_warn(mp,
1611                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1612 
1613                 error = bdev_dax_supported(sb, sb->s_blocksize);
1614                 if (error) {
1615                         xfs_alert(mp,
1616                         "DAX unsupported by block device. Turning off DAX.");
1617                         mp->m_flags &= ~XFS_MOUNT_DAX;
1618                 }
1619                 if (xfs_sb_version_hasreflink(&mp->m_sb))
1620                         xfs_alert(mp,
1621                 "DAX and reflink have not been tested together!");
1622         }
1623 
1624         if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
1625                 if (mp->m_sb.sb_rblocks) {
1626                         xfs_alert(mp,
1627         "EXPERIMENTAL reverse mapping btree not compatible with realtime device!");
1628                         error = -EINVAL;
1629                         goto out_filestream_unmount;
1630                 }
1631                 xfs_alert(mp,
1632         "EXPERIMENTAL reverse mapping btree feature enabled. Use at your own risk!");
1633         }
1634 
1635         if (xfs_sb_version_hasreflink(&mp->m_sb))
1636                 xfs_alert(mp,
1637         "EXPERIMENTAL reflink feature enabled. Use at your own risk!");
1638 
1639         error = xfs_mountfs(mp);
1640         if (error)
1641                 goto out_filestream_unmount;
1642 
1643         root = igrab(VFS_I(mp->m_rootip));
1644         if (!root) {
1645                 error = -ENOENT;
1646                 goto out_unmount;
1647         }
1648         sb->s_root = d_make_root(root);
1649         if (!sb->s_root) {
1650                 error = -ENOMEM;
1651                 goto out_unmount;
1652         }
1653 
1654         return 0;
1655 
1656  out_filestream_unmount:
1657         xfs_filestream_unmount(mp);
1658  out_free_sb:
1659         xfs_freesb(mp);
1660  out_free_stats:
1661         free_percpu(mp->m_stats.xs_stats);
1662  out_destroy_counters:
1663         xfs_destroy_percpu_counters(mp);
1664  out_destroy_workqueues:
1665         xfs_destroy_mount_workqueues(mp);
1666  out_close_devices:
1667         xfs_close_devices(mp);
1668  out_free_fsname:
1669         xfs_free_fsname(mp);
1670         kfree(mp);
1671  out:
1672         return error;
1673 
1674  out_unmount:
1675         xfs_filestream_unmount(mp);
1676         xfs_unmountfs(mp);
1677         goto out_free_sb;
1678 }
1679 
1680 STATIC void
1681 xfs_fs_put_super(
1682         struct super_block      *sb)
1683 {
1684         struct xfs_mount        *mp = XFS_M(sb);
1685 
1686         xfs_notice(mp, "Unmounting Filesystem");
1687         xfs_filestream_unmount(mp);
1688         xfs_unmountfs(mp);
1689 
1690         xfs_freesb(mp);
1691         free_percpu(mp->m_stats.xs_stats);
1692         xfs_destroy_percpu_counters(mp);
1693         xfs_destroy_mount_workqueues(mp);
1694         xfs_close_devices(mp);
1695         xfs_free_fsname(mp);
1696         kfree(mp);
1697 }
1698 
1699 STATIC struct dentry *
1700 xfs_fs_mount(
1701         struct file_system_type *fs_type,
1702         int                     flags,
1703         const char              *dev_name,
1704         void                    *data)
1705 {
1706         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1707 }
1708 
1709 static long
1710 xfs_fs_nr_cached_objects(
1711         struct super_block      *sb,
1712         struct shrink_control   *sc)
1713 {
1714         return xfs_reclaim_inodes_count(XFS_M(sb));
1715 }
1716 
1717 static long
1718 xfs_fs_free_cached_objects(
1719         struct super_block      *sb,
1720         struct shrink_control   *sc)
1721 {
1722         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1723 }
1724 
1725 static const struct super_operations xfs_super_operations = {
1726         .alloc_inode            = xfs_fs_alloc_inode,
1727         .destroy_inode          = xfs_fs_destroy_inode,
1728         .drop_inode             = xfs_fs_drop_inode,
1729         .put_super              = xfs_fs_put_super,
1730         .sync_fs                = xfs_fs_sync_fs,
1731         .freeze_fs              = xfs_fs_freeze,
1732         .unfreeze_fs            = xfs_fs_unfreeze,
1733         .statfs                 = xfs_fs_statfs,
1734         .remount_fs             = xfs_fs_remount,
1735         .show_options           = xfs_fs_show_options,
1736         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1737         .free_cached_objects    = xfs_fs_free_cached_objects,
1738 };
1739 
1740 static struct file_system_type xfs_fs_type = {
1741         .owner                  = THIS_MODULE,
1742         .name                   = "xfs",
1743         .mount                  = xfs_fs_mount,
1744         .kill_sb                = kill_block_super,
1745         .fs_flags               = FS_REQUIRES_DEV,
1746 };
1747 MODULE_ALIAS_FS("xfs");
1748 
1749 STATIC int __init
1750 xfs_init_zones(void)
1751 {
1752         xfs_ioend_bioset = bioset_create(4 * MAX_BUF_PER_PAGE,
1753                         offsetof(struct xfs_ioend, io_inline_bio));
1754         if (!xfs_ioend_bioset)
1755                 goto out;
1756 
1757         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1758                                                 "xfs_log_ticket");
1759         if (!xfs_log_ticket_zone)
1760                 goto out_free_ioend_bioset;
1761 
1762         xfs_bmap_free_item_zone = kmem_zone_init(
1763                         sizeof(struct xfs_extent_free_item),
1764                         "xfs_bmap_free_item");
1765         if (!xfs_bmap_free_item_zone)
1766                 goto out_destroy_log_ticket_zone;
1767 
1768         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1769                                                 "xfs_btree_cur");
1770         if (!xfs_btree_cur_zone)
1771                 goto out_destroy_bmap_free_item_zone;
1772 
1773         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1774                                                 "xfs_da_state");
1775         if (!xfs_da_state_zone)
1776                 goto out_destroy_btree_cur_zone;
1777 
1778         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1779         if (!xfs_ifork_zone)
1780                 goto out_destroy_da_state_zone;
1781 
1782         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1783         if (!xfs_trans_zone)
1784                 goto out_destroy_ifork_zone;
1785 
1786         xfs_log_item_desc_zone =
1787                 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1788                                "xfs_log_item_desc");
1789         if (!xfs_log_item_desc_zone)
1790                 goto out_destroy_trans_zone;
1791 
1792         /*
1793          * The size of the zone allocated buf log item is the maximum
1794          * size possible under XFS.  This wastes a little bit of memory,
1795          * but it is much faster.
1796          */
1797         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1798                                            "xfs_buf_item");
1799         if (!xfs_buf_item_zone)
1800                 goto out_destroy_log_item_desc_zone;
1801 
1802         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1803                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1804                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1805         if (!xfs_efd_zone)
1806                 goto out_destroy_buf_item_zone;
1807 
1808         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1809                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1810                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1811         if (!xfs_efi_zone)
1812                 goto out_destroy_efd_zone;
1813 
1814         xfs_inode_zone =
1815                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1816                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD |
1817                         KM_ZONE_ACCOUNT, xfs_fs_inode_init_once);
1818         if (!xfs_inode_zone)
1819                 goto out_destroy_efi_zone;
1820 
1821         xfs_ili_zone =
1822                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1823                                         KM_ZONE_SPREAD, NULL);
1824         if (!xfs_ili_zone)
1825                 goto out_destroy_inode_zone;
1826         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1827                                         "xfs_icr");
1828         if (!xfs_icreate_zone)
1829                 goto out_destroy_ili_zone;
1830 
1831         xfs_rud_zone = kmem_zone_init(sizeof(struct xfs_rud_log_item),
1832                         "xfs_rud_item");
1833         if (!xfs_rud_zone)
1834                 goto out_destroy_icreate_zone;
1835 
1836         xfs_rui_zone = kmem_zone_init(
1837                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
1838                         "xfs_rui_item");
1839         if (!xfs_rui_zone)
1840                 goto out_destroy_rud_zone;
1841 
1842         xfs_cud_zone = kmem_zone_init(sizeof(struct xfs_cud_log_item),
1843                         "xfs_cud_item");
1844         if (!xfs_cud_zone)
1845                 goto out_destroy_rui_zone;
1846 
1847         xfs_cui_zone = kmem_zone_init(
1848                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
1849                         "xfs_cui_item");
1850         if (!xfs_cui_zone)
1851                 goto out_destroy_cud_zone;
1852 
1853         xfs_bud_zone = kmem_zone_init(sizeof(struct xfs_bud_log_item),
1854                         "xfs_bud_item");
1855         if (!xfs_bud_zone)
1856                 goto out_destroy_cui_zone;
1857 
1858         xfs_bui_zone = kmem_zone_init(
1859                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
1860                         "xfs_bui_item");
1861         if (!xfs_bui_zone)
1862                 goto out_destroy_bud_zone;
1863 
1864         return 0;
1865 
1866  out_destroy_bud_zone:
1867         kmem_zone_destroy(xfs_bud_zone);
1868  out_destroy_cui_zone:
1869         kmem_zone_destroy(xfs_cui_zone);
1870  out_destroy_cud_zone:
1871         kmem_zone_destroy(xfs_cud_zone);
1872  out_destroy_rui_zone:
1873         kmem_zone_destroy(xfs_rui_zone);
1874  out_destroy_rud_zone:
1875         kmem_zone_destroy(xfs_rud_zone);
1876  out_destroy_icreate_zone:
1877         kmem_zone_destroy(xfs_icreate_zone);
1878  out_destroy_ili_zone:
1879         kmem_zone_destroy(xfs_ili_zone);
1880  out_destroy_inode_zone:
1881         kmem_zone_destroy(xfs_inode_zone);
1882  out_destroy_efi_zone:
1883         kmem_zone_destroy(xfs_efi_zone);
1884  out_destroy_efd_zone:
1885         kmem_zone_destroy(xfs_efd_zone);
1886  out_destroy_buf_item_zone:
1887         kmem_zone_destroy(xfs_buf_item_zone);
1888  out_destroy_log_item_desc_zone:
1889         kmem_zone_destroy(xfs_log_item_desc_zone);
1890  out_destroy_trans_zone:
1891         kmem_zone_destroy(xfs_trans_zone);
1892  out_destroy_ifork_zone:
1893         kmem_zone_destroy(xfs_ifork_zone);
1894  out_destroy_da_state_zone:
1895         kmem_zone_destroy(xfs_da_state_zone);
1896  out_destroy_btree_cur_zone:
1897         kmem_zone_destroy(xfs_btree_cur_zone);
1898  out_destroy_bmap_free_item_zone:
1899         kmem_zone_destroy(xfs_bmap_free_item_zone);
1900  out_destroy_log_ticket_zone:
1901         kmem_zone_destroy(xfs_log_ticket_zone);
1902  out_free_ioend_bioset:
1903         bioset_free(xfs_ioend_bioset);
1904  out:
1905         return -ENOMEM;
1906 }
1907 
1908 STATIC void
1909 xfs_destroy_zones(void)
1910 {
1911         /*
1912          * Make sure all delayed rcu free are flushed before we
1913          * destroy caches.
1914          */
1915         rcu_barrier();
1916         kmem_zone_destroy(xfs_bui_zone);
1917         kmem_zone_destroy(xfs_bud_zone);
1918         kmem_zone_destroy(xfs_cui_zone);
1919         kmem_zone_destroy(xfs_cud_zone);
1920         kmem_zone_destroy(xfs_rui_zone);
1921         kmem_zone_destroy(xfs_rud_zone);
1922         kmem_zone_destroy(xfs_icreate_zone);
1923         kmem_zone_destroy(xfs_ili_zone);
1924         kmem_zone_destroy(xfs_inode_zone);
1925         kmem_zone_destroy(xfs_efi_zone);
1926         kmem_zone_destroy(xfs_efd_zone);
1927         kmem_zone_destroy(xfs_buf_item_zone);
1928         kmem_zone_destroy(xfs_log_item_desc_zone);
1929         kmem_zone_destroy(xfs_trans_zone);
1930         kmem_zone_destroy(xfs_ifork_zone);
1931         kmem_zone_destroy(xfs_da_state_zone);
1932         kmem_zone_destroy(xfs_btree_cur_zone);
1933         kmem_zone_destroy(xfs_bmap_free_item_zone);
1934         kmem_zone_destroy(xfs_log_ticket_zone);
1935         bioset_free(xfs_ioend_bioset);
1936 }
1937 
1938 STATIC int __init
1939 xfs_init_workqueues(void)
1940 {
1941         /*
1942          * The allocation workqueue can be used in memory reclaim situations
1943          * (writepage path), and parallelism is only limited by the number of
1944          * AGs in all the filesystems mounted. Hence use the default large
1945          * max_active value for this workqueue.
1946          */
1947         xfs_alloc_wq = alloc_workqueue("xfsalloc",
1948                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
1949         if (!xfs_alloc_wq)
1950                 return -ENOMEM;
1951 
1952         return 0;
1953 }
1954 
1955 STATIC void
1956 xfs_destroy_workqueues(void)
1957 {
1958         destroy_workqueue(xfs_alloc_wq);
1959 }
1960 
1961 STATIC int __init
1962 init_xfs_fs(void)
1963 {
1964         int                     error;
1965 
1966         xfs_check_ondisk_structs();
1967 
1968         printk(KERN_INFO XFS_VERSION_STRING " with "
1969                          XFS_BUILD_OPTIONS " enabled\n");
1970 
1971         xfs_extent_free_init_defer_op();
1972         xfs_rmap_update_init_defer_op();
1973         xfs_refcount_update_init_defer_op();
1974         xfs_bmap_update_init_defer_op();
1975 
1976         xfs_dir_startup();
1977 
1978         error = xfs_init_zones();
1979         if (error)
1980                 goto out;
1981 
1982         error = xfs_init_workqueues();
1983         if (error)
1984                 goto out_destroy_zones;
1985 
1986         error = xfs_mru_cache_init();
1987         if (error)
1988                 goto out_destroy_wq;
1989 
1990         error = xfs_buf_init();
1991         if (error)
1992                 goto out_mru_cache_uninit;
1993 
1994         error = xfs_init_procfs();
1995         if (error)
1996                 goto out_buf_terminate;
1997 
1998         error = xfs_sysctl_register();
1999         if (error)
2000                 goto out_cleanup_procfs;
2001 
2002         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2003         if (!xfs_kset) {
2004                 error = -ENOMEM;
2005                 goto out_sysctl_unregister;
2006         }
2007 
2008         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2009 
2010         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2011         if (!xfsstats.xs_stats) {
2012                 error = -ENOMEM;
2013                 goto out_kset_unregister;
2014         }
2015 
2016         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2017                                "stats");
2018         if (error)
2019                 goto out_free_stats;
2020 
2021 #ifdef DEBUG
2022         xfs_dbg_kobj.kobject.kset = xfs_kset;
2023         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2024         if (error)
2025                 goto out_remove_stats_kobj;
2026 #endif
2027 
2028         error = xfs_qm_init();
2029         if (error)
2030                 goto out_remove_dbg_kobj;
2031 
2032         error = register_filesystem(&xfs_fs_type);
2033         if (error)
2034                 goto out_qm_exit;
2035         return 0;
2036 
2037  out_qm_exit:
2038         xfs_qm_exit();
2039  out_remove_dbg_kobj:
2040 #ifdef DEBUG
2041         xfs_sysfs_del(&xfs_dbg_kobj);
2042  out_remove_stats_kobj:
2043 #endif
2044         xfs_sysfs_del(&xfsstats.xs_kobj);
2045  out_free_stats:
2046         free_percpu(xfsstats.xs_stats);
2047  out_kset_unregister:
2048         kset_unregister(xfs_kset);
2049  out_sysctl_unregister:
2050         xfs_sysctl_unregister();
2051  out_cleanup_procfs:
2052         xfs_cleanup_procfs();
2053  out_buf_terminate:
2054         xfs_buf_terminate();
2055  out_mru_cache_uninit:
2056         xfs_mru_cache_uninit();
2057  out_destroy_wq:
2058         xfs_destroy_workqueues();
2059  out_destroy_zones:
2060         xfs_destroy_zones();
2061  out:
2062         return error;
2063 }
2064 
2065 STATIC void __exit
2066 exit_xfs_fs(void)
2067 {
2068         xfs_qm_exit();
2069         unregister_filesystem(&xfs_fs_type);
2070 #ifdef DEBUG
2071         xfs_sysfs_del(&xfs_dbg_kobj);
2072 #endif
2073         xfs_sysfs_del(&xfsstats.xs_kobj);
2074         free_percpu(xfsstats.xs_stats);
2075         kset_unregister(xfs_kset);
2076         xfs_sysctl_unregister();
2077         xfs_cleanup_procfs();
2078         xfs_buf_terminate();
2079         xfs_mru_cache_uninit();
2080         xfs_destroy_workqueues();
2081         xfs_destroy_zones();
2082         xfs_uuid_table_free();
2083 }
2084 
2085 module_init(init_xfs_fs);
2086 module_exit(exit_xfs_fs);
2087 
2088 MODULE_AUTHOR("Silicon Graphics, Inc.");
2089 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2090 MODULE_LICENSE("GPL");
2091 

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