Version:  2.0.40 2.2.26 2.4.37 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 4.10

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_inode64,   "inode64"},     /* inodes can be allocated anywhere */
108         {Opt_inode32,   "inode32"},     /* inode allocation limited to
109                                          * XFS_MAXINUMBER_32 */
110         {Opt_ikeep,     "ikeep"},       /* do not free empty inode clusters */
111         {Opt_noikeep,   "noikeep"},     /* free empty inode clusters */
112         {Opt_largeio,   "largeio"},     /* report large I/O sizes in stat() */
113         {Opt_nolargeio, "nolargeio"},   /* do not report large I/O sizes
114                                          * in stat(). */
115         {Opt_attr2,     "attr2"},       /* do use attr2 attribute format */
116         {Opt_noattr2,   "noattr2"},     /* do not use attr2 attribute format */
117         {Opt_filestreams,"filestreams"},/* use filestreams allocator */
118         {Opt_quota,     "quota"},       /* disk quotas (user) */
119         {Opt_noquota,   "noquota"},     /* no quotas */
120         {Opt_usrquota,  "usrquota"},    /* user quota enabled */
121         {Opt_grpquota,  "grpquota"},    /* group quota enabled */
122         {Opt_prjquota,  "prjquota"},    /* project quota enabled */
123         {Opt_uquota,    "uquota"},      /* user quota (IRIX variant) */
124         {Opt_gquota,    "gquota"},      /* group quota (IRIX variant) */
125         {Opt_pquota,    "pquota"},      /* project quota (IRIX variant) */
126         {Opt_uqnoenforce,"uqnoenforce"},/* user quota limit enforcement */
127         {Opt_gqnoenforce,"gqnoenforce"},/* group quota limit enforcement */
128         {Opt_pqnoenforce,"pqnoenforce"},/* project quota limit enforcement */
129         {Opt_qnoenforce, "qnoenforce"}, /* same as uqnoenforce */
130         {Opt_discard,   "discard"},     /* Discard unused blocks */
131         {Opt_nodiscard, "nodiscard"},   /* Do not discard unused blocks */
132 
133         {Opt_dax,       "dax"},         /* Enable direct access to bdev pages */
134 
135         /* Deprecated mount options scheduled for removal */
136         {Opt_barrier,   "barrier"},     /* use writer barriers for log write and
137                                          * unwritten extent conversion */
138         {Opt_nobarrier, "nobarrier"},   /* .. disable */
139 
140         {Opt_err,       NULL},
141 };
142 
143 
144 STATIC int
145 suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
146 {
147         int     last, shift_left_factor = 0, _res;
148         char    *value;
149         int     ret = 0;
150 
151         value = match_strdup(s);
152         if (!value)
153                 return -ENOMEM;
154 
155         last = strlen(value) - 1;
156         if (value[last] == 'K' || value[last] == 'k') {
157                 shift_left_factor = 10;
158                 value[last] = '\0';
159         }
160         if (value[last] == 'M' || value[last] == 'm') {
161                 shift_left_factor = 20;
162                 value[last] = '\0';
163         }
164         if (value[last] == 'G' || value[last] == 'g') {
165                 shift_left_factor = 30;
166                 value[last] = '\0';
167         }
168 
169         if (kstrtoint(value, base, &_res))
170                 ret = -EINVAL;
171         kfree(value);
172         *res = _res << shift_left_factor;
173         return ret;
174 }
175 
176 /*
177  * This function fills in xfs_mount_t fields based on mount args.
178  * Note: the superblock has _not_ yet been read in.
179  *
180  * Note that this function leaks the various device name allocations on
181  * failure.  The caller takes care of them.
182  *
183  * *sb is const because this is also used to test options on the remount
184  * path, and we don't want this to have any side effects at remount time.
185  * Today this function does not change *sb, but just to future-proof...
186  */
187 STATIC int
188 xfs_parseargs(
189         struct xfs_mount        *mp,
190         char                    *options)
191 {
192         const struct super_block *sb = mp->m_super;
193         char                    *p;
194         substring_t             args[MAX_OPT_ARGS];
195         int                     dsunit = 0;
196         int                     dswidth = 0;
197         int                     iosize = 0;
198         __uint8_t               iosizelog = 0;
199 
200         /*
201          * set up the mount name first so all the errors will refer to the
202          * correct device.
203          */
204         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
205         if (!mp->m_fsname)
206                 return -ENOMEM;
207         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
208 
209         /*
210          * Copy binary VFS mount flags we are interested in.
211          */
212         if (sb->s_flags & MS_RDONLY)
213                 mp->m_flags |= XFS_MOUNT_RDONLY;
214         if (sb->s_flags & MS_DIRSYNC)
215                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
216         if (sb->s_flags & MS_SYNCHRONOUS)
217                 mp->m_flags |= XFS_MOUNT_WSYNC;
218 
219         /*
220          * Set some default flags that could be cleared by the mount option
221          * parsing.
222          */
223         mp->m_flags |= XFS_MOUNT_BARRIER;
224         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
225 
226         /*
227          * These can be overridden by the mount option parsing.
228          */
229         mp->m_logbufs = -1;
230         mp->m_logbsize = -1;
231 
232         if (!options)
233                 goto done;
234 
235         while ((p = strsep(&options, ",")) != NULL) {
236                 int             token;
237 
238                 if (!*p)
239                         continue;
240 
241                 token = match_token(p, tokens, args);
242                 switch (token) {
243                 case Opt_logbufs:
244                         if (match_int(args, &mp->m_logbufs))
245                                 return -EINVAL;
246                         break;
247                 case Opt_logbsize:
248                         if (suffix_kstrtoint(args, 10, &mp->m_logbsize))
249                                 return -EINVAL;
250                         break;
251                 case Opt_logdev:
252                         mp->m_logname = match_strdup(args);
253                         if (!mp->m_logname)
254                                 return -ENOMEM;
255                         break;
256                 case Opt_mtpt:
257                         xfs_warn(mp, "%s option not allowed on this system", p);
258                         return -EINVAL;
259                 case Opt_rtdev:
260                         mp->m_rtname = match_strdup(args);
261                         if (!mp->m_rtname)
262                                 return -ENOMEM;
263                         break;
264                 case Opt_allocsize:
265                 case Opt_biosize:
266                         if (suffix_kstrtoint(args, 10, &iosize))
267                                 return -EINVAL;
268                         iosizelog = ffs(iosize) - 1;
269                         break;
270                 case Opt_grpid:
271                 case Opt_bsdgroups:
272                         mp->m_flags |= XFS_MOUNT_GRPID;
273                         break;
274                 case Opt_nogrpid:
275                 case Opt_sysvgroups:
276                         mp->m_flags &= ~XFS_MOUNT_GRPID;
277                         break;
278                 case Opt_wsync:
279                         mp->m_flags |= XFS_MOUNT_WSYNC;
280                         break;
281                 case Opt_norecovery:
282                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
283                         break;
284                 case Opt_noalign:
285                         mp->m_flags |= XFS_MOUNT_NOALIGN;
286                         break;
287                 case Opt_swalloc:
288                         mp->m_flags |= XFS_MOUNT_SWALLOC;
289                         break;
290                 case Opt_sunit:
291                         if (match_int(args, &dsunit))
292                                 return -EINVAL;
293                         break;
294                 case Opt_swidth:
295                         if (match_int(args, &dswidth))
296                                 return -EINVAL;
297                         break;
298                 case Opt_inode32:
299                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
300                         break;
301                 case Opt_inode64:
302                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
303                         break;
304                 case Opt_nouuid:
305                         mp->m_flags |= XFS_MOUNT_NOUUID;
306                         break;
307                 case Opt_ikeep:
308                         mp->m_flags |= XFS_MOUNT_IKEEP;
309                         break;
310                 case Opt_noikeep:
311                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
312                         break;
313                 case Opt_largeio:
314                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
315                         break;
316                 case Opt_nolargeio:
317                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
318                         break;
319                 case Opt_attr2:
320                         mp->m_flags |= XFS_MOUNT_ATTR2;
321                         break;
322                 case Opt_noattr2:
323                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
324                         mp->m_flags |= XFS_MOUNT_NOATTR2;
325                         break;
326                 case Opt_filestreams:
327                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
328                         break;
329                 case Opt_noquota:
330                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
331                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
332                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
333                         break;
334                 case Opt_quota:
335                 case Opt_uquota:
336                 case Opt_usrquota:
337                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
338                                          XFS_UQUOTA_ENFD);
339                         break;
340                 case Opt_qnoenforce:
341                 case Opt_uqnoenforce:
342                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
343                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
344                         break;
345                 case Opt_pquota:
346                 case Opt_prjquota:
347                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
348                                          XFS_PQUOTA_ENFD);
349                         break;
350                 case Opt_pqnoenforce:
351                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
352                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
353                         break;
354                 case Opt_gquota:
355                 case Opt_grpquota:
356                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
357                                          XFS_GQUOTA_ENFD);
358                         break;
359                 case Opt_gqnoenforce:
360                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
361                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
362                         break;
363                 case Opt_discard:
364                         mp->m_flags |= XFS_MOUNT_DISCARD;
365                         break;
366                 case Opt_nodiscard:
367                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
368                         break;
369 #ifdef CONFIG_FS_DAX
370                 case Opt_dax:
371                         mp->m_flags |= XFS_MOUNT_DAX;
372                         break;
373 #endif
374                 case Opt_barrier:
375                         xfs_warn(mp, "%s option is deprecated, ignoring.", p);
376                         mp->m_flags |= XFS_MOUNT_BARRIER;
377                         break;
378                 case Opt_nobarrier:
379                         xfs_warn(mp, "%s option is deprecated, ignoring.", p);
380                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
381                         break;
382                 default:
383                         xfs_warn(mp, "unknown mount option [%s].", p);
384                         return -EINVAL;
385                 }
386         }
387 
388         /*
389          * no recovery flag requires a read-only mount
390          */
391         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
392             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
393                 xfs_warn(mp, "no-recovery mounts must be read-only.");
394                 return -EINVAL;
395         }
396 
397         if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
398                 xfs_warn(mp,
399         "sunit and swidth options incompatible with the noalign option");
400                 return -EINVAL;
401         }
402 
403 #ifndef CONFIG_XFS_QUOTA
404         if (XFS_IS_QUOTA_RUNNING(mp)) {
405                 xfs_warn(mp, "quota support not available in this kernel.");
406                 return -EINVAL;
407         }
408 #endif
409 
410         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
411                 xfs_warn(mp, "sunit and swidth must be specified together");
412                 return -EINVAL;
413         }
414 
415         if (dsunit && (dswidth % dsunit != 0)) {
416                 xfs_warn(mp,
417         "stripe width (%d) must be a multiple of the stripe unit (%d)",
418                         dswidth, dsunit);
419                 return -EINVAL;
420         }
421 
422 done:
423         if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
424                 /*
425                  * At this point the superblock has not been read
426                  * in, therefore we do not know the block size.
427                  * Before the mount call ends we will convert
428                  * these to FSBs.
429                  */
430                 mp->m_dalign = dsunit;
431                 mp->m_swidth = dswidth;
432         }
433 
434         if (mp->m_logbufs != -1 &&
435             mp->m_logbufs != 0 &&
436             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
437              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
438                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
439                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
440                 return -EINVAL;
441         }
442         if (mp->m_logbsize != -1 &&
443             mp->m_logbsize !=  0 &&
444             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
445              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
446              !is_power_of_2(mp->m_logbsize))) {
447                 xfs_warn(mp,
448                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
449                         mp->m_logbsize);
450                 return -EINVAL;
451         }
452 
453         if (iosizelog) {
454                 if (iosizelog > XFS_MAX_IO_LOG ||
455                     iosizelog < XFS_MIN_IO_LOG) {
456                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
457                                 iosizelog, XFS_MIN_IO_LOG,
458                                 XFS_MAX_IO_LOG);
459                         return -EINVAL;
460                 }
461 
462                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
463                 mp->m_readio_log = iosizelog;
464                 mp->m_writeio_log = iosizelog;
465         }
466 
467         return 0;
468 }
469 
470 struct proc_xfs_info {
471         uint64_t        flag;
472         char            *str;
473 };
474 
475 STATIC int
476 xfs_showargs(
477         struct xfs_mount        *mp,
478         struct seq_file         *m)
479 {
480         static struct proc_xfs_info xfs_info_set[] = {
481                 /* the few simple ones we can get from the mount struct */
482                 { XFS_MOUNT_IKEEP,              ",ikeep" },
483                 { XFS_MOUNT_WSYNC,              ",wsync" },
484                 { XFS_MOUNT_NOALIGN,            ",noalign" },
485                 { XFS_MOUNT_SWALLOC,            ",swalloc" },
486                 { XFS_MOUNT_NOUUID,             ",nouuid" },
487                 { XFS_MOUNT_NORECOVERY,         ",norecovery" },
488                 { XFS_MOUNT_ATTR2,              ",attr2" },
489                 { XFS_MOUNT_FILESTREAMS,        ",filestreams" },
490                 { XFS_MOUNT_GRPID,              ",grpid" },
491                 { XFS_MOUNT_DISCARD,            ",discard" },
492                 { XFS_MOUNT_SMALL_INUMS,        ",inode32" },
493                 { XFS_MOUNT_DAX,                ",dax" },
494                 { 0, NULL }
495         };
496         static struct proc_xfs_info xfs_info_unset[] = {
497                 /* the few simple ones we can get from the mount struct */
498                 { XFS_MOUNT_COMPAT_IOSIZE,      ",largeio" },
499                 { XFS_MOUNT_BARRIER,            ",nobarrier" },
500                 { XFS_MOUNT_SMALL_INUMS,        ",inode64" },
501                 { 0, NULL }
502         };
503         struct proc_xfs_info    *xfs_infop;
504 
505         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
506                 if (mp->m_flags & xfs_infop->flag)
507                         seq_puts(m, xfs_infop->str);
508         }
509         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
510                 if (!(mp->m_flags & xfs_infop->flag))
511                         seq_puts(m, xfs_infop->str);
512         }
513 
514         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
515                 seq_printf(m, ",allocsize=%dk",
516                                 (int)(1 << mp->m_writeio_log) >> 10);
517 
518         if (mp->m_logbufs > 0)
519                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
520         if (mp->m_logbsize > 0)
521                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
522 
523         if (mp->m_logname)
524                 seq_show_option(m, "logdev", mp->m_logname);
525         if (mp->m_rtname)
526                 seq_show_option(m, "rtdev", mp->m_rtname);
527 
528         if (mp->m_dalign > 0)
529                 seq_printf(m, ",sunit=%d",
530                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
531         if (mp->m_swidth > 0)
532                 seq_printf(m, ",swidth=%d",
533                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
534 
535         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
536                 seq_puts(m, ",usrquota");
537         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
538                 seq_puts(m, ",uqnoenforce");
539 
540         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
541                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
542                         seq_puts(m, ",prjquota");
543                 else
544                         seq_puts(m, ",pqnoenforce");
545         }
546         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
547                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
548                         seq_puts(m, ",grpquota");
549                 else
550                         seq_puts(m, ",gqnoenforce");
551         }
552 
553         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
554                 seq_puts(m, ",noquota");
555 
556         return 0;
557 }
558 static __uint64_t
559 xfs_max_file_offset(
560         unsigned int            blockshift)
561 {
562         unsigned int            pagefactor = 1;
563         unsigned int            bitshift = BITS_PER_LONG - 1;
564 
565         /* Figure out maximum filesize, on Linux this can depend on
566          * the filesystem blocksize (on 32 bit platforms).
567          * __block_write_begin does this in an [unsigned] long...
568          *      page->index << (PAGE_SHIFT - bbits)
569          * So, for page sized blocks (4K on 32 bit platforms),
570          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
571          *      (((u64)PAGE_SIZE << (BITS_PER_LONG-1))-1)
572          * but for smaller blocksizes it is less (bbits = log2 bsize).
573          * Note1: get_block_t takes a long (implicit cast from above)
574          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
575          * can optionally convert the [unsigned] long from above into
576          * an [unsigned] long long.
577          */
578 
579 #if BITS_PER_LONG == 32
580 # if defined(CONFIG_LBDAF)
581         ASSERT(sizeof(sector_t) == 8);
582         pagefactor = PAGE_SIZE;
583         bitshift = BITS_PER_LONG;
584 # else
585         pagefactor = PAGE_SIZE >> (PAGE_SHIFT - blockshift);
586 # endif
587 #endif
588 
589         return (((__uint64_t)pagefactor) << bitshift) - 1;
590 }
591 
592 /*
593  * Set parameters for inode allocation heuristics, taking into account
594  * filesystem size and inode32/inode64 mount options; i.e. specifically
595  * whether or not XFS_MOUNT_SMALL_INUMS is set.
596  *
597  * Inode allocation patterns are altered only if inode32 is requested
598  * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
599  * If altered, XFS_MOUNT_32BITINODES is set as well.
600  *
601  * An agcount independent of that in the mount structure is provided
602  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
603  * to the potentially higher ag count.
604  *
605  * Returns the maximum AG index which may contain inodes.
606  */
607 xfs_agnumber_t
608 xfs_set_inode_alloc(
609         struct xfs_mount *mp,
610         xfs_agnumber_t  agcount)
611 {
612         xfs_agnumber_t  index;
613         xfs_agnumber_t  maxagi = 0;
614         xfs_sb_t        *sbp = &mp->m_sb;
615         xfs_agnumber_t  max_metadata;
616         xfs_agino_t     agino;
617         xfs_ino_t       ino;
618 
619         /*
620          * Calculate how much should be reserved for inodes to meet
621          * the max inode percentage.  Used only for inode32.
622          */
623         if (mp->m_maxicount) {
624                 __uint64_t      icount;
625 
626                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
627                 do_div(icount, 100);
628                 icount += sbp->sb_agblocks - 1;
629                 do_div(icount, sbp->sb_agblocks);
630                 max_metadata = icount;
631         } else {
632                 max_metadata = agcount;
633         }
634 
635         /* Get the last possible inode in the filesystem */
636         agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
637         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
638 
639         /*
640          * If user asked for no more than 32-bit inodes, and the fs is
641          * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
642          * the allocator to accommodate the request.
643          */
644         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
645                 mp->m_flags |= XFS_MOUNT_32BITINODES;
646         else
647                 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
648 
649         for (index = 0; index < agcount; index++) {
650                 struct xfs_perag        *pag;
651 
652                 ino = XFS_AGINO_TO_INO(mp, index, agino);
653 
654                 pag = xfs_perag_get(mp, index);
655 
656                 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
657                         if (ino > XFS_MAXINUMBER_32) {
658                                 pag->pagi_inodeok = 0;
659                                 pag->pagf_metadata = 0;
660                         } else {
661                                 pag->pagi_inodeok = 1;
662                                 maxagi++;
663                                 if (index < max_metadata)
664                                         pag->pagf_metadata = 1;
665                                 else
666                                         pag->pagf_metadata = 0;
667                         }
668                 } else {
669                         pag->pagi_inodeok = 1;
670                         pag->pagf_metadata = 0;
671                 }
672 
673                 xfs_perag_put(pag);
674         }
675 
676         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
677 }
678 
679 STATIC int
680 xfs_blkdev_get(
681         xfs_mount_t             *mp,
682         const char              *name,
683         struct block_device     **bdevp)
684 {
685         int                     error = 0;
686 
687         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
688                                     mp);
689         if (IS_ERR(*bdevp)) {
690                 error = PTR_ERR(*bdevp);
691                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
692         }
693 
694         return error;
695 }
696 
697 STATIC void
698 xfs_blkdev_put(
699         struct block_device     *bdev)
700 {
701         if (bdev)
702                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
703 }
704 
705 void
706 xfs_blkdev_issue_flush(
707         xfs_buftarg_t           *buftarg)
708 {
709         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
710 }
711 
712 STATIC void
713 xfs_close_devices(
714         struct xfs_mount        *mp)
715 {
716         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
717                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
718                 xfs_free_buftarg(mp, mp->m_logdev_targp);
719                 xfs_blkdev_put(logdev);
720         }
721         if (mp->m_rtdev_targp) {
722                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
723                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
724                 xfs_blkdev_put(rtdev);
725         }
726         xfs_free_buftarg(mp, mp->m_ddev_targp);
727 }
728 
729 /*
730  * The file system configurations are:
731  *      (1) device (partition) with data and internal log
732  *      (2) logical volume with data and log subvolumes.
733  *      (3) logical volume with data, log, and realtime subvolumes.
734  *
735  * We only have to handle opening the log and realtime volumes here if
736  * they are present.  The data subvolume has already been opened by
737  * get_sb_bdev() and is stored in sb->s_bdev.
738  */
739 STATIC int
740 xfs_open_devices(
741         struct xfs_mount        *mp)
742 {
743         struct block_device     *ddev = mp->m_super->s_bdev;
744         struct block_device     *logdev = NULL, *rtdev = NULL;
745         int                     error;
746 
747         /*
748          * Open real time and log devices - order is important.
749          */
750         if (mp->m_logname) {
751                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
752                 if (error)
753                         goto out;
754         }
755 
756         if (mp->m_rtname) {
757                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
758                 if (error)
759                         goto out_close_logdev;
760 
761                 if (rtdev == ddev || rtdev == logdev) {
762                         xfs_warn(mp,
763         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
764                         error = -EINVAL;
765                         goto out_close_rtdev;
766                 }
767         }
768 
769         /*
770          * Setup xfs_mount buffer target pointers
771          */
772         error = -ENOMEM;
773         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev);
774         if (!mp->m_ddev_targp)
775                 goto out_close_rtdev;
776 
777         if (rtdev) {
778                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev);
779                 if (!mp->m_rtdev_targp)
780                         goto out_free_ddev_targ;
781         }
782 
783         if (logdev && logdev != ddev) {
784                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
785                 if (!mp->m_logdev_targp)
786                         goto out_free_rtdev_targ;
787         } else {
788                 mp->m_logdev_targp = mp->m_ddev_targp;
789         }
790 
791         return 0;
792 
793  out_free_rtdev_targ:
794         if (mp->m_rtdev_targp)
795                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
796  out_free_ddev_targ:
797         xfs_free_buftarg(mp, mp->m_ddev_targp);
798  out_close_rtdev:
799         xfs_blkdev_put(rtdev);
800  out_close_logdev:
801         if (logdev && logdev != ddev)
802                 xfs_blkdev_put(logdev);
803  out:
804         return error;
805 }
806 
807 /*
808  * Setup xfs_mount buffer target pointers based on superblock
809  */
810 STATIC int
811 xfs_setup_devices(
812         struct xfs_mount        *mp)
813 {
814         int                     error;
815 
816         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
817         if (error)
818                 return error;
819 
820         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
821                 unsigned int    log_sector_size = BBSIZE;
822 
823                 if (xfs_sb_version_hassector(&mp->m_sb))
824                         log_sector_size = mp->m_sb.sb_logsectsize;
825                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
826                                             log_sector_size);
827                 if (error)
828                         return error;
829         }
830         if (mp->m_rtdev_targp) {
831                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
832                                             mp->m_sb.sb_sectsize);
833                 if (error)
834                         return error;
835         }
836 
837         return 0;
838 }
839 
840 STATIC int
841 xfs_init_mount_workqueues(
842         struct xfs_mount        *mp)
843 {
844         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
845                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
846         if (!mp->m_buf_workqueue)
847                 goto out;
848 
849         mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
850                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
851         if (!mp->m_data_workqueue)
852                 goto out_destroy_buf;
853 
854         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
855                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
856         if (!mp->m_unwritten_workqueue)
857                 goto out_destroy_data_iodone_queue;
858 
859         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
860                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
861         if (!mp->m_cil_workqueue)
862                 goto out_destroy_unwritten;
863 
864         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
865                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
866         if (!mp->m_reclaim_workqueue)
867                 goto out_destroy_cil;
868 
869         mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
870                         WQ_MEM_RECLAIM|WQ_FREEZABLE|WQ_HIGHPRI, 0,
871                         mp->m_fsname);
872         if (!mp->m_log_workqueue)
873                 goto out_destroy_reclaim;
874 
875         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
876                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
877         if (!mp->m_eofblocks_workqueue)
878                 goto out_destroy_log;
879 
880         return 0;
881 
882 out_destroy_log:
883         destroy_workqueue(mp->m_log_workqueue);
884 out_destroy_reclaim:
885         destroy_workqueue(mp->m_reclaim_workqueue);
886 out_destroy_cil:
887         destroy_workqueue(mp->m_cil_workqueue);
888 out_destroy_unwritten:
889         destroy_workqueue(mp->m_unwritten_workqueue);
890 out_destroy_data_iodone_queue:
891         destroy_workqueue(mp->m_data_workqueue);
892 out_destroy_buf:
893         destroy_workqueue(mp->m_buf_workqueue);
894 out:
895         return -ENOMEM;
896 }
897 
898 STATIC void
899 xfs_destroy_mount_workqueues(
900         struct xfs_mount        *mp)
901 {
902         destroy_workqueue(mp->m_eofblocks_workqueue);
903         destroy_workqueue(mp->m_log_workqueue);
904         destroy_workqueue(mp->m_reclaim_workqueue);
905         destroy_workqueue(mp->m_cil_workqueue);
906         destroy_workqueue(mp->m_data_workqueue);
907         destroy_workqueue(mp->m_unwritten_workqueue);
908         destroy_workqueue(mp->m_buf_workqueue);
909 }
910 
911 /*
912  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
913  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
914  * for IO to complete so that we effectively throttle multiple callers to the
915  * rate at which IO is completing.
916  */
917 void
918 xfs_flush_inodes(
919         struct xfs_mount        *mp)
920 {
921         struct super_block      *sb = mp->m_super;
922 
923         if (down_read_trylock(&sb->s_umount)) {
924                 sync_inodes_sb(sb);
925                 up_read(&sb->s_umount);
926         }
927 }
928 
929 /* Catch misguided souls that try to use this interface on XFS */
930 STATIC struct inode *
931 xfs_fs_alloc_inode(
932         struct super_block      *sb)
933 {
934         BUG();
935         return NULL;
936 }
937 
938 /*
939  * Now that the generic code is guaranteed not to be accessing
940  * the linux inode, we can inactivate and reclaim the inode.
941  */
942 STATIC void
943 xfs_fs_destroy_inode(
944         struct inode            *inode)
945 {
946         struct xfs_inode        *ip = XFS_I(inode);
947         int                     error;
948 
949         trace_xfs_destroy_inode(ip);
950 
951         ASSERT(!rwsem_is_locked(&inode->i_rwsem));
952         XFS_STATS_INC(ip->i_mount, vn_rele);
953         XFS_STATS_INC(ip->i_mount, vn_remove);
954 
955         if (xfs_is_reflink_inode(ip)) {
956                 error = xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF);
957                 if (error && !XFS_FORCED_SHUTDOWN(ip->i_mount))
958                         xfs_warn(ip->i_mount,
959 "Error %d while evicting CoW blocks for inode %llu.",
960                                         error, ip->i_ino);
961         }
962 
963         xfs_inactive(ip);
964 
965         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
966         XFS_STATS_INC(ip->i_mount, vn_reclaim);
967 
968         /*
969          * We should never get here with one of the reclaim flags already set.
970          */
971         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
972         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
973 
974         /*
975          * We always use background reclaim here because even if the
976          * inode is clean, it still may be under IO and hence we have
977          * to take the flush lock. The background reclaim path handles
978          * this more efficiently than we can here, so simply let background
979          * reclaim tear down all inodes.
980          */
981         xfs_inode_set_reclaim_tag(ip);
982 }
983 
984 /*
985  * Slab object creation initialisation for the XFS inode.
986  * This covers only the idempotent fields in the XFS inode;
987  * all other fields need to be initialised on allocation
988  * from the slab. This avoids the need to repeatedly initialise
989  * fields in the xfs inode that left in the initialise state
990  * when freeing the inode.
991  */
992 STATIC void
993 xfs_fs_inode_init_once(
994         void                    *inode)
995 {
996         struct xfs_inode        *ip = inode;
997 
998         memset(ip, 0, sizeof(struct xfs_inode));
999 
1000         /* vfs inode */
1001         inode_init_once(VFS_I(ip));
1002 
1003         /* xfs inode */
1004         atomic_set(&ip->i_pincount, 0);
1005         spin_lock_init(&ip->i_flags_lock);
1006 
1007         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1008                      "xfsino", ip->i_ino);
1009         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1010                      "xfsino", ip->i_ino);
1011 }
1012 
1013 /*
1014  * We do an unlocked check for XFS_IDONTCACHE here because we are already
1015  * serialised against cache hits here via the inode->i_lock and igrab() in
1016  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
1017  * racing with us, and it avoids needing to grab a spinlock here for every inode
1018  * we drop the final reference on.
1019  */
1020 STATIC int
1021 xfs_fs_drop_inode(
1022         struct inode            *inode)
1023 {
1024         struct xfs_inode        *ip = XFS_I(inode);
1025 
1026         /*
1027          * If this unlinked inode is in the middle of recovery, don't
1028          * drop the inode just yet; log recovery will take care of
1029          * that.  See the comment for this inode flag.
1030          */
1031         if (ip->i_flags & XFS_IRECOVERY) {
1032                 ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED);
1033                 return 0;
1034         }
1035 
1036         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1037 }
1038 
1039 STATIC void
1040 xfs_free_fsname(
1041         struct xfs_mount        *mp)
1042 {
1043         kfree(mp->m_fsname);
1044         kfree(mp->m_rtname);
1045         kfree(mp->m_logname);
1046 }
1047 
1048 STATIC int
1049 xfs_fs_sync_fs(
1050         struct super_block      *sb,
1051         int                     wait)
1052 {
1053         struct xfs_mount        *mp = XFS_M(sb);
1054 
1055         /*
1056          * Doing anything during the async pass would be counterproductive.
1057          */
1058         if (!wait)
1059                 return 0;
1060 
1061         xfs_log_force(mp, XFS_LOG_SYNC);
1062         if (laptop_mode) {
1063                 /*
1064                  * The disk must be active because we're syncing.
1065                  * We schedule log work now (now that the disk is
1066                  * active) instead of later (when it might not be).
1067                  */
1068                 flush_delayed_work(&mp->m_log->l_work);
1069         }
1070 
1071         return 0;
1072 }
1073 
1074 STATIC int
1075 xfs_fs_statfs(
1076         struct dentry           *dentry,
1077         struct kstatfs          *statp)
1078 {
1079         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1080         xfs_sb_t                *sbp = &mp->m_sb;
1081         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
1082         __uint64_t              fakeinos, id;
1083         __uint64_t              icount;
1084         __uint64_t              ifree;
1085         __uint64_t              fdblocks;
1086         xfs_extlen_t            lsize;
1087         __int64_t               ffree;
1088 
1089         statp->f_type = XFS_SB_MAGIC;
1090         statp->f_namelen = MAXNAMELEN - 1;
1091 
1092         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1093         statp->f_fsid.val[0] = (u32)id;
1094         statp->f_fsid.val[1] = (u32)(id >> 32);
1095 
1096         icount = percpu_counter_sum(&mp->m_icount);
1097         ifree = percpu_counter_sum(&mp->m_ifree);
1098         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1099 
1100         spin_lock(&mp->m_sb_lock);
1101         statp->f_bsize = sbp->sb_blocksize;
1102         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1103         statp->f_blocks = sbp->sb_dblocks - lsize;
1104         spin_unlock(&mp->m_sb_lock);
1105 
1106         statp->f_bfree = fdblocks - mp->m_alloc_set_aside;
1107         statp->f_bavail = statp->f_bfree;
1108 
1109         fakeinos = statp->f_bfree << sbp->sb_inopblog;
1110         statp->f_files = MIN(icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1111         if (mp->m_maxicount)
1112                 statp->f_files = min_t(typeof(statp->f_files),
1113                                         statp->f_files,
1114                                         mp->m_maxicount);
1115 
1116         /* If sb_icount overshot maxicount, report actual allocation */
1117         statp->f_files = max_t(typeof(statp->f_files),
1118                                         statp->f_files,
1119                                         sbp->sb_icount);
1120 
1121         /* make sure statp->f_ffree does not underflow */
1122         ffree = statp->f_files - (icount - ifree);
1123         statp->f_ffree = max_t(__int64_t, ffree, 0);
1124 
1125 
1126         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1127             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1128                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1129                 xfs_qm_statvfs(ip, statp);
1130         return 0;
1131 }
1132 
1133 STATIC void
1134 xfs_save_resvblks(struct xfs_mount *mp)
1135 {
1136         __uint64_t resblks = 0;
1137 
1138         mp->m_resblks_save = mp->m_resblks;
1139         xfs_reserve_blocks(mp, &resblks, NULL);
1140 }
1141 
1142 STATIC void
1143 xfs_restore_resvblks(struct xfs_mount *mp)
1144 {
1145         __uint64_t resblks;
1146 
1147         if (mp->m_resblks_save) {
1148                 resblks = mp->m_resblks_save;
1149                 mp->m_resblks_save = 0;
1150         } else
1151                 resblks = xfs_default_resblks(mp);
1152 
1153         xfs_reserve_blocks(mp, &resblks, NULL);
1154 }
1155 
1156 /*
1157  * Trigger writeback of all the dirty metadata in the file system.
1158  *
1159  * This ensures that the metadata is written to their location on disk rather
1160  * than just existing in transactions in the log. This means after a quiesce
1161  * there is no log replay required to write the inodes to disk - this is the
1162  * primary difference between a sync and a quiesce.
1163  *
1164  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1165  * it is started again when appropriate.
1166  */
1167 void
1168 xfs_quiesce_attr(
1169         struct xfs_mount        *mp)
1170 {
1171         int     error = 0;
1172 
1173         /* wait for all modifications to complete */
1174         while (atomic_read(&mp->m_active_trans) > 0)
1175                 delay(100);
1176 
1177         /* force the log to unpin objects from the now complete transactions */
1178         xfs_log_force(mp, XFS_LOG_SYNC);
1179 
1180         /* reclaim inodes to do any IO before the freeze completes */
1181         xfs_reclaim_inodes(mp, 0);
1182         xfs_reclaim_inodes(mp, SYNC_WAIT);
1183 
1184         /* Push the superblock and write an unmount record */
1185         error = xfs_log_sbcount(mp);
1186         if (error)
1187                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1188                                 "Frozen image may not be consistent.");
1189         /*
1190          * Just warn here till VFS can correctly support
1191          * read-only remount without racing.
1192          */
1193         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1194 
1195         xfs_log_quiesce(mp);
1196 }
1197 
1198 STATIC int
1199 xfs_test_remount_options(
1200         struct super_block      *sb,
1201         struct xfs_mount        *mp,
1202         char                    *options)
1203 {
1204         int                     error = 0;
1205         struct xfs_mount        *tmp_mp;
1206 
1207         tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL);
1208         if (!tmp_mp)
1209                 return -ENOMEM;
1210 
1211         tmp_mp->m_super = sb;
1212         error = xfs_parseargs(tmp_mp, options);
1213         xfs_free_fsname(tmp_mp);
1214         kfree(tmp_mp);
1215 
1216         return error;
1217 }
1218 
1219 STATIC int
1220 xfs_fs_remount(
1221         struct super_block      *sb,
1222         int                     *flags,
1223         char                    *options)
1224 {
1225         struct xfs_mount        *mp = XFS_M(sb);
1226         xfs_sb_t                *sbp = &mp->m_sb;
1227         substring_t             args[MAX_OPT_ARGS];
1228         char                    *p;
1229         int                     error;
1230 
1231         /* First, check for complete junk; i.e. invalid options */
1232         error = xfs_test_remount_options(sb, mp, options);
1233         if (error)
1234                 return error;
1235 
1236         sync_filesystem(sb);
1237         while ((p = strsep(&options, ",")) != NULL) {
1238                 int token;
1239 
1240                 if (!*p)
1241                         continue;
1242 
1243                 token = match_token(p, tokens, args);
1244                 switch (token) {
1245                 case Opt_barrier:
1246                         xfs_warn(mp, "%s option is deprecated, ignoring.", p);
1247                         mp->m_flags |= XFS_MOUNT_BARRIER;
1248                         break;
1249                 case Opt_nobarrier:
1250                         xfs_warn(mp, "%s option is deprecated, ignoring.", p);
1251                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
1252                         break;
1253                 case Opt_inode64:
1254                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1255                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1256                         break;
1257                 case Opt_inode32:
1258                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1259                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1260                         break;
1261                 default:
1262                         /*
1263                          * Logically we would return an error here to prevent
1264                          * users from believing they might have changed
1265                          * mount options using remount which can't be changed.
1266                          *
1267                          * But unfortunately mount(8) adds all options from
1268                          * mtab and fstab to the mount arguments in some cases
1269                          * so we can't blindly reject options, but have to
1270                          * check for each specified option if it actually
1271                          * differs from the currently set option and only
1272                          * reject it if that's the case.
1273                          *
1274                          * Until that is implemented we return success for
1275                          * every remount request, and silently ignore all
1276                          * options that we can't actually change.
1277                          */
1278 #if 0
1279                         xfs_info(mp,
1280                 "mount option \"%s\" not supported for remount", p);
1281                         return -EINVAL;
1282 #else
1283                         break;
1284 #endif
1285                 }
1286         }
1287 
1288         /* ro -> rw */
1289         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1290                 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1291                         xfs_warn(mp,
1292                 "ro->rw transition prohibited on norecovery mount");
1293                         return -EINVAL;
1294                 }
1295 
1296                 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1297                     xfs_sb_has_ro_compat_feature(sbp,
1298                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1299                         xfs_warn(mp,
1300 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1301                                 (sbp->sb_features_ro_compat &
1302                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1303                         return -EINVAL;
1304                 }
1305 
1306                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1307 
1308                 /*
1309                  * If this is the first remount to writeable state we
1310                  * might have some superblock changes to update.
1311                  */
1312                 if (mp->m_update_sb) {
1313                         error = xfs_sync_sb(mp, false);
1314                         if (error) {
1315                                 xfs_warn(mp, "failed to write sb changes");
1316                                 return error;
1317                         }
1318                         mp->m_update_sb = false;
1319                 }
1320 
1321                 /*
1322                  * Fill out the reserve pool if it is empty. Use the stashed
1323                  * value if it is non-zero, otherwise go with the default.
1324                  */
1325                 xfs_restore_resvblks(mp);
1326                 xfs_log_work_queue(mp);
1327                 xfs_queue_eofblocks(mp);
1328 
1329                 /* Recover any CoW blocks that never got remapped. */
1330                 error = xfs_reflink_recover_cow(mp);
1331                 if (error) {
1332                         xfs_err(mp,
1333         "Error %d recovering leftover CoW allocations.", error);
1334                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1335                         return error;
1336                 }
1337 
1338                 /* Create the per-AG metadata reservation pool .*/
1339                 error = xfs_fs_reserve_ag_blocks(mp);
1340                 if (error && error != -ENOSPC)
1341                         return error;
1342         }
1343 
1344         /* rw -> ro */
1345         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1346                 /* Free the per-AG metadata reservation pool. */
1347                 error = xfs_fs_unreserve_ag_blocks(mp);
1348                 if (error) {
1349                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1350                         return error;
1351                 }
1352 
1353                 /*
1354                  * Before we sync the metadata, we need to free up the reserve
1355                  * block pool so that the used block count in the superblock on
1356                  * disk is correct at the end of the remount. Stash the current
1357                  * reserve pool size so that if we get remounted rw, we can
1358                  * return it to the same size.
1359                  */
1360                 xfs_save_resvblks(mp);
1361 
1362                 /*
1363                  * Cancel background eofb scanning so it cannot race with the
1364                  * final log force+buftarg wait and deadlock the remount.
1365                  */
1366                 cancel_delayed_work_sync(&mp->m_eofblocks_work);
1367 
1368                 xfs_quiesce_attr(mp);
1369                 mp->m_flags |= XFS_MOUNT_RDONLY;
1370         }
1371 
1372         return 0;
1373 }
1374 
1375 /*
1376  * Second stage of a freeze. The data is already frozen so we only
1377  * need to take care of the metadata. Once that's done sync the superblock
1378  * to the log to dirty it in case of a crash while frozen. This ensures that we
1379  * will recover the unlinked inode lists on the next mount.
1380  */
1381 STATIC int
1382 xfs_fs_freeze(
1383         struct super_block      *sb)
1384 {
1385         struct xfs_mount        *mp = XFS_M(sb);
1386 
1387         xfs_save_resvblks(mp);
1388         xfs_quiesce_attr(mp);
1389         return xfs_sync_sb(mp, true);
1390 }
1391 
1392 STATIC int
1393 xfs_fs_unfreeze(
1394         struct super_block      *sb)
1395 {
1396         struct xfs_mount        *mp = XFS_M(sb);
1397 
1398         xfs_restore_resvblks(mp);
1399         xfs_log_work_queue(mp);
1400         return 0;
1401 }
1402 
1403 STATIC int
1404 xfs_fs_show_options(
1405         struct seq_file         *m,
1406         struct dentry           *root)
1407 {
1408         return xfs_showargs(XFS_M(root->d_sb), m);
1409 }
1410 
1411 /*
1412  * This function fills in xfs_mount_t fields based on mount args.
1413  * Note: the superblock _has_ now been read in.
1414  */
1415 STATIC int
1416 xfs_finish_flags(
1417         struct xfs_mount        *mp)
1418 {
1419         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1420 
1421         /* Fail a mount where the logbuf is smaller than the log stripe */
1422         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1423                 if (mp->m_logbsize <= 0 &&
1424                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1425                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1426                 } else if (mp->m_logbsize > 0 &&
1427                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1428                         xfs_warn(mp,
1429                 "logbuf size must be greater than or equal to log stripe size");
1430                         return -EINVAL;
1431                 }
1432         } else {
1433                 /* Fail a mount if the logbuf is larger than 32K */
1434                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1435                         xfs_warn(mp,
1436                 "logbuf size for version 1 logs must be 16K or 32K");
1437                         return -EINVAL;
1438                 }
1439         }
1440 
1441         /*
1442          * V5 filesystems always use attr2 format for attributes.
1443          */
1444         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1445             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1446                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
1447                              "attr2 is always enabled for V5 filesystems.");
1448                 return -EINVAL;
1449         }
1450 
1451         /*
1452          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1453          * told by noattr2 to turn it off
1454          */
1455         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1456             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1457                 mp->m_flags |= XFS_MOUNT_ATTR2;
1458 
1459         /*
1460          * prohibit r/w mounts of read-only filesystems
1461          */
1462         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1463                 xfs_warn(mp,
1464                         "cannot mount a read-only filesystem as read-write");
1465                 return -EROFS;
1466         }
1467 
1468         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1469             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1470             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1471                 xfs_warn(mp,
1472                   "Super block does not support project and group quota together");
1473                 return -EINVAL;
1474         }
1475 
1476         return 0;
1477 }
1478 
1479 static int
1480 xfs_init_percpu_counters(
1481         struct xfs_mount        *mp)
1482 {
1483         int             error;
1484 
1485         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1486         if (error)
1487                 return -ENOMEM;
1488 
1489         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1490         if (error)
1491                 goto free_icount;
1492 
1493         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1494         if (error)
1495                 goto free_ifree;
1496 
1497         return 0;
1498 
1499 free_ifree:
1500         percpu_counter_destroy(&mp->m_ifree);
1501 free_icount:
1502         percpu_counter_destroy(&mp->m_icount);
1503         return -ENOMEM;
1504 }
1505 
1506 void
1507 xfs_reinit_percpu_counters(
1508         struct xfs_mount        *mp)
1509 {
1510         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1511         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1512         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1513 }
1514 
1515 static void
1516 xfs_destroy_percpu_counters(
1517         struct xfs_mount        *mp)
1518 {
1519         percpu_counter_destroy(&mp->m_icount);
1520         percpu_counter_destroy(&mp->m_ifree);
1521         percpu_counter_destroy(&mp->m_fdblocks);
1522 }
1523 
1524 STATIC int
1525 xfs_fs_fill_super(
1526         struct super_block      *sb,
1527         void                    *data,
1528         int                     silent)
1529 {
1530         struct inode            *root;
1531         struct xfs_mount        *mp = NULL;
1532         int                     flags = 0, error = -ENOMEM;
1533 
1534         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1535         if (!mp)
1536                 goto out;
1537 
1538         spin_lock_init(&mp->m_sb_lock);
1539         mutex_init(&mp->m_growlock);
1540         atomic_set(&mp->m_active_trans, 0);
1541         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1542         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1543         INIT_DELAYED_WORK(&mp->m_cowblocks_work, xfs_cowblocks_worker);
1544         mp->m_kobj.kobject.kset = xfs_kset;
1545 
1546         mp->m_super = sb;
1547         sb->s_fs_info = mp;
1548 
1549         error = xfs_parseargs(mp, (char *)data);
1550         if (error)
1551                 goto out_free_fsname;
1552 
1553         sb_min_blocksize(sb, BBSIZE);
1554         sb->s_xattr = xfs_xattr_handlers;
1555         sb->s_export_op = &xfs_export_operations;
1556 #ifdef CONFIG_XFS_QUOTA
1557         sb->s_qcop = &xfs_quotactl_operations;
1558         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1559 #endif
1560         sb->s_op = &xfs_super_operations;
1561 
1562         if (silent)
1563                 flags |= XFS_MFSI_QUIET;
1564 
1565         error = xfs_open_devices(mp);
1566         if (error)
1567                 goto out_free_fsname;
1568 
1569         error = xfs_init_mount_workqueues(mp);
1570         if (error)
1571                 goto out_close_devices;
1572 
1573         error = xfs_init_percpu_counters(mp);
1574         if (error)
1575                 goto out_destroy_workqueues;
1576 
1577         /* Allocate stats memory before we do operations that might use it */
1578         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1579         if (!mp->m_stats.xs_stats) {
1580                 error = -ENOMEM;
1581                 goto out_destroy_counters;
1582         }
1583 
1584         error = xfs_readsb(mp, flags);
1585         if (error)
1586                 goto out_free_stats;
1587 
1588         error = xfs_finish_flags(mp);
1589         if (error)
1590                 goto out_free_sb;
1591 
1592         error = xfs_setup_devices(mp);
1593         if (error)
1594                 goto out_free_sb;
1595 
1596         error = xfs_filestream_mount(mp);
1597         if (error)
1598                 goto out_free_sb;
1599 
1600         /*
1601          * we must configure the block size in the superblock before we run the
1602          * full mount process as the mount process can lookup and cache inodes.
1603          */
1604         sb->s_magic = XFS_SB_MAGIC;
1605         sb->s_blocksize = mp->m_sb.sb_blocksize;
1606         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1607         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1608         sb->s_max_links = XFS_MAXLINK;
1609         sb->s_time_gran = 1;
1610         set_posix_acl_flag(sb);
1611 
1612         /* version 5 superblocks support inode version counters. */
1613         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1614                 sb->s_flags |= MS_I_VERSION;
1615 
1616         if (mp->m_flags & XFS_MOUNT_DAX) {
1617                 xfs_warn(mp,
1618                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1619 
1620                 error = bdev_dax_supported(sb, sb->s_blocksize);
1621                 if (error) {
1622                         xfs_alert(mp,
1623                         "DAX unsupported by block device. Turning off DAX.");
1624                         mp->m_flags &= ~XFS_MOUNT_DAX;
1625                 }
1626                 if (xfs_sb_version_hasreflink(&mp->m_sb))
1627                         xfs_alert(mp,
1628                 "DAX and reflink have not been tested together!");
1629         }
1630 
1631         if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
1632                 if (mp->m_sb.sb_rblocks) {
1633                         xfs_alert(mp,
1634         "EXPERIMENTAL reverse mapping btree not compatible with realtime device!");
1635                         error = -EINVAL;
1636                         goto out_filestream_unmount;
1637                 }
1638                 xfs_alert(mp,
1639         "EXPERIMENTAL reverse mapping btree feature enabled. Use at your own risk!");
1640         }
1641 
1642         if (xfs_sb_version_hasreflink(&mp->m_sb))
1643                 xfs_alert(mp,
1644         "EXPERIMENTAL reflink feature enabled. Use at your own risk!");
1645 
1646         error = xfs_mountfs(mp);
1647         if (error)
1648                 goto out_filestream_unmount;
1649 
1650         root = igrab(VFS_I(mp->m_rootip));
1651         if (!root) {
1652                 error = -ENOENT;
1653                 goto out_unmount;
1654         }
1655         sb->s_root = d_make_root(root);
1656         if (!sb->s_root) {
1657                 error = -ENOMEM;
1658                 goto out_unmount;
1659         }
1660 
1661         return 0;
1662 
1663  out_filestream_unmount:
1664         xfs_filestream_unmount(mp);
1665  out_free_sb:
1666         xfs_freesb(mp);
1667  out_free_stats:
1668         free_percpu(mp->m_stats.xs_stats);
1669  out_destroy_counters:
1670         xfs_destroy_percpu_counters(mp);
1671  out_destroy_workqueues:
1672         xfs_destroy_mount_workqueues(mp);
1673  out_close_devices:
1674         xfs_close_devices(mp);
1675  out_free_fsname:
1676         xfs_free_fsname(mp);
1677         kfree(mp);
1678  out:
1679         return error;
1680 
1681  out_unmount:
1682         xfs_filestream_unmount(mp);
1683         xfs_unmountfs(mp);
1684         goto out_free_sb;
1685 }
1686 
1687 STATIC void
1688 xfs_fs_put_super(
1689         struct super_block      *sb)
1690 {
1691         struct xfs_mount        *mp = XFS_M(sb);
1692 
1693         xfs_notice(mp, "Unmounting Filesystem");
1694         xfs_filestream_unmount(mp);
1695         xfs_unmountfs(mp);
1696 
1697         xfs_freesb(mp);
1698         free_percpu(mp->m_stats.xs_stats);
1699         xfs_destroy_percpu_counters(mp);
1700         xfs_destroy_mount_workqueues(mp);
1701         xfs_close_devices(mp);
1702         xfs_free_fsname(mp);
1703         kfree(mp);
1704 }
1705 
1706 STATIC struct dentry *
1707 xfs_fs_mount(
1708         struct file_system_type *fs_type,
1709         int                     flags,
1710         const char              *dev_name,
1711         void                    *data)
1712 {
1713         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1714 }
1715 
1716 static long
1717 xfs_fs_nr_cached_objects(
1718         struct super_block      *sb,
1719         struct shrink_control   *sc)
1720 {
1721         return xfs_reclaim_inodes_count(XFS_M(sb));
1722 }
1723 
1724 static long
1725 xfs_fs_free_cached_objects(
1726         struct super_block      *sb,
1727         struct shrink_control   *sc)
1728 {
1729         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1730 }
1731 
1732 static const struct super_operations xfs_super_operations = {
1733         .alloc_inode            = xfs_fs_alloc_inode,
1734         .destroy_inode          = xfs_fs_destroy_inode,
1735         .drop_inode             = xfs_fs_drop_inode,
1736         .put_super              = xfs_fs_put_super,
1737         .sync_fs                = xfs_fs_sync_fs,
1738         .freeze_fs              = xfs_fs_freeze,
1739         .unfreeze_fs            = xfs_fs_unfreeze,
1740         .statfs                 = xfs_fs_statfs,
1741         .remount_fs             = xfs_fs_remount,
1742         .show_options           = xfs_fs_show_options,
1743         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1744         .free_cached_objects    = xfs_fs_free_cached_objects,
1745 };
1746 
1747 static struct file_system_type xfs_fs_type = {
1748         .owner                  = THIS_MODULE,
1749         .name                   = "xfs",
1750         .mount                  = xfs_fs_mount,
1751         .kill_sb                = kill_block_super,
1752         .fs_flags               = FS_REQUIRES_DEV,
1753 };
1754 MODULE_ALIAS_FS("xfs");
1755 
1756 STATIC int __init
1757 xfs_init_zones(void)
1758 {
1759         xfs_ioend_bioset = bioset_create(4 * MAX_BUF_PER_PAGE,
1760                         offsetof(struct xfs_ioend, io_inline_bio));
1761         if (!xfs_ioend_bioset)
1762                 goto out;
1763 
1764         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1765                                                 "xfs_log_ticket");
1766         if (!xfs_log_ticket_zone)
1767                 goto out_free_ioend_bioset;
1768 
1769         xfs_bmap_free_item_zone = kmem_zone_init(
1770                         sizeof(struct xfs_extent_free_item),
1771                         "xfs_bmap_free_item");
1772         if (!xfs_bmap_free_item_zone)
1773                 goto out_destroy_log_ticket_zone;
1774 
1775         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1776                                                 "xfs_btree_cur");
1777         if (!xfs_btree_cur_zone)
1778                 goto out_destroy_bmap_free_item_zone;
1779 
1780         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1781                                                 "xfs_da_state");
1782         if (!xfs_da_state_zone)
1783                 goto out_destroy_btree_cur_zone;
1784 
1785         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1786         if (!xfs_ifork_zone)
1787                 goto out_destroy_da_state_zone;
1788 
1789         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1790         if (!xfs_trans_zone)
1791                 goto out_destroy_ifork_zone;
1792 
1793         xfs_log_item_desc_zone =
1794                 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1795                                "xfs_log_item_desc");
1796         if (!xfs_log_item_desc_zone)
1797                 goto out_destroy_trans_zone;
1798 
1799         /*
1800          * The size of the zone allocated buf log item is the maximum
1801          * size possible under XFS.  This wastes a little bit of memory,
1802          * but it is much faster.
1803          */
1804         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1805                                            "xfs_buf_item");
1806         if (!xfs_buf_item_zone)
1807                 goto out_destroy_log_item_desc_zone;
1808 
1809         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1810                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1811                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1812         if (!xfs_efd_zone)
1813                 goto out_destroy_buf_item_zone;
1814 
1815         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1816                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1817                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1818         if (!xfs_efi_zone)
1819                 goto out_destroy_efd_zone;
1820 
1821         xfs_inode_zone =
1822                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1823                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD |
1824                         KM_ZONE_ACCOUNT, xfs_fs_inode_init_once);
1825         if (!xfs_inode_zone)
1826                 goto out_destroy_efi_zone;
1827 
1828         xfs_ili_zone =
1829                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1830                                         KM_ZONE_SPREAD, NULL);
1831         if (!xfs_ili_zone)
1832                 goto out_destroy_inode_zone;
1833         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1834                                         "xfs_icr");
1835         if (!xfs_icreate_zone)
1836                 goto out_destroy_ili_zone;
1837 
1838         xfs_rud_zone = kmem_zone_init(sizeof(struct xfs_rud_log_item),
1839                         "xfs_rud_item");
1840         if (!xfs_rud_zone)
1841                 goto out_destroy_icreate_zone;
1842 
1843         xfs_rui_zone = kmem_zone_init(
1844                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
1845                         "xfs_rui_item");
1846         if (!xfs_rui_zone)
1847                 goto out_destroy_rud_zone;
1848 
1849         xfs_cud_zone = kmem_zone_init(sizeof(struct xfs_cud_log_item),
1850                         "xfs_cud_item");
1851         if (!xfs_cud_zone)
1852                 goto out_destroy_rui_zone;
1853 
1854         xfs_cui_zone = kmem_zone_init(
1855                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
1856                         "xfs_cui_item");
1857         if (!xfs_cui_zone)
1858                 goto out_destroy_cud_zone;
1859 
1860         xfs_bud_zone = kmem_zone_init(sizeof(struct xfs_bud_log_item),
1861                         "xfs_bud_item");
1862         if (!xfs_bud_zone)
1863                 goto out_destroy_cui_zone;
1864 
1865         xfs_bui_zone = kmem_zone_init(
1866                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
1867                         "xfs_bui_item");
1868         if (!xfs_bui_zone)
1869                 goto out_destroy_bud_zone;
1870 
1871         return 0;
1872 
1873  out_destroy_bud_zone:
1874         kmem_zone_destroy(xfs_bud_zone);
1875  out_destroy_cui_zone:
1876         kmem_zone_destroy(xfs_cui_zone);
1877  out_destroy_cud_zone:
1878         kmem_zone_destroy(xfs_cud_zone);
1879  out_destroy_rui_zone:
1880         kmem_zone_destroy(xfs_rui_zone);
1881  out_destroy_rud_zone:
1882         kmem_zone_destroy(xfs_rud_zone);
1883  out_destroy_icreate_zone:
1884         kmem_zone_destroy(xfs_icreate_zone);
1885  out_destroy_ili_zone:
1886         kmem_zone_destroy(xfs_ili_zone);
1887  out_destroy_inode_zone:
1888         kmem_zone_destroy(xfs_inode_zone);
1889  out_destroy_efi_zone:
1890         kmem_zone_destroy(xfs_efi_zone);
1891  out_destroy_efd_zone:
1892         kmem_zone_destroy(xfs_efd_zone);
1893  out_destroy_buf_item_zone:
1894         kmem_zone_destroy(xfs_buf_item_zone);
1895  out_destroy_log_item_desc_zone:
1896         kmem_zone_destroy(xfs_log_item_desc_zone);
1897  out_destroy_trans_zone:
1898         kmem_zone_destroy(xfs_trans_zone);
1899  out_destroy_ifork_zone:
1900         kmem_zone_destroy(xfs_ifork_zone);
1901  out_destroy_da_state_zone:
1902         kmem_zone_destroy(xfs_da_state_zone);
1903  out_destroy_btree_cur_zone:
1904         kmem_zone_destroy(xfs_btree_cur_zone);
1905  out_destroy_bmap_free_item_zone:
1906         kmem_zone_destroy(xfs_bmap_free_item_zone);
1907  out_destroy_log_ticket_zone:
1908         kmem_zone_destroy(xfs_log_ticket_zone);
1909  out_free_ioend_bioset:
1910         bioset_free(xfs_ioend_bioset);
1911  out:
1912         return -ENOMEM;
1913 }
1914 
1915 STATIC void
1916 xfs_destroy_zones(void)
1917 {
1918         /*
1919          * Make sure all delayed rcu free are flushed before we
1920          * destroy caches.
1921          */
1922         rcu_barrier();
1923         kmem_zone_destroy(xfs_bui_zone);
1924         kmem_zone_destroy(xfs_bud_zone);
1925         kmem_zone_destroy(xfs_cui_zone);
1926         kmem_zone_destroy(xfs_cud_zone);
1927         kmem_zone_destroy(xfs_rui_zone);
1928         kmem_zone_destroy(xfs_rud_zone);
1929         kmem_zone_destroy(xfs_icreate_zone);
1930         kmem_zone_destroy(xfs_ili_zone);
1931         kmem_zone_destroy(xfs_inode_zone);
1932         kmem_zone_destroy(xfs_efi_zone);
1933         kmem_zone_destroy(xfs_efd_zone);
1934         kmem_zone_destroy(xfs_buf_item_zone);
1935         kmem_zone_destroy(xfs_log_item_desc_zone);
1936         kmem_zone_destroy(xfs_trans_zone);
1937         kmem_zone_destroy(xfs_ifork_zone);
1938         kmem_zone_destroy(xfs_da_state_zone);
1939         kmem_zone_destroy(xfs_btree_cur_zone);
1940         kmem_zone_destroy(xfs_bmap_free_item_zone);
1941         kmem_zone_destroy(xfs_log_ticket_zone);
1942         bioset_free(xfs_ioend_bioset);
1943 }
1944 
1945 STATIC int __init
1946 xfs_init_workqueues(void)
1947 {
1948         /*
1949          * The allocation workqueue can be used in memory reclaim situations
1950          * (writepage path), and parallelism is only limited by the number of
1951          * AGs in all the filesystems mounted. Hence use the default large
1952          * max_active value for this workqueue.
1953          */
1954         xfs_alloc_wq = alloc_workqueue("xfsalloc",
1955                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
1956         if (!xfs_alloc_wq)
1957                 return -ENOMEM;
1958 
1959         return 0;
1960 }
1961 
1962 STATIC void
1963 xfs_destroy_workqueues(void)
1964 {
1965         destroy_workqueue(xfs_alloc_wq);
1966 }
1967 
1968 STATIC int __init
1969 init_xfs_fs(void)
1970 {
1971         int                     error;
1972 
1973         xfs_check_ondisk_structs();
1974 
1975         printk(KERN_INFO XFS_VERSION_STRING " with "
1976                          XFS_BUILD_OPTIONS " enabled\n");
1977 
1978         xfs_extent_free_init_defer_op();
1979         xfs_rmap_update_init_defer_op();
1980         xfs_refcount_update_init_defer_op();
1981         xfs_bmap_update_init_defer_op();
1982 
1983         xfs_dir_startup();
1984 
1985         error = xfs_init_zones();
1986         if (error)
1987                 goto out;
1988 
1989         error = xfs_init_workqueues();
1990         if (error)
1991                 goto out_destroy_zones;
1992 
1993         error = xfs_mru_cache_init();
1994         if (error)
1995                 goto out_destroy_wq;
1996 
1997         error = xfs_buf_init();
1998         if (error)
1999                 goto out_mru_cache_uninit;
2000 
2001         error = xfs_init_procfs();
2002         if (error)
2003                 goto out_buf_terminate;
2004 
2005         error = xfs_sysctl_register();
2006         if (error)
2007                 goto out_cleanup_procfs;
2008 
2009         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2010         if (!xfs_kset) {
2011                 error = -ENOMEM;
2012                 goto out_sysctl_unregister;
2013         }
2014 
2015         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2016 
2017         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2018         if (!xfsstats.xs_stats) {
2019                 error = -ENOMEM;
2020                 goto out_kset_unregister;
2021         }
2022 
2023         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2024                                "stats");
2025         if (error)
2026                 goto out_free_stats;
2027 
2028 #ifdef DEBUG
2029         xfs_dbg_kobj.kobject.kset = xfs_kset;
2030         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2031         if (error)
2032                 goto out_remove_stats_kobj;
2033 #endif
2034 
2035         error = xfs_qm_init();
2036         if (error)
2037                 goto out_remove_dbg_kobj;
2038 
2039         error = register_filesystem(&xfs_fs_type);
2040         if (error)
2041                 goto out_qm_exit;
2042         return 0;
2043 
2044  out_qm_exit:
2045         xfs_qm_exit();
2046  out_remove_dbg_kobj:
2047 #ifdef DEBUG
2048         xfs_sysfs_del(&xfs_dbg_kobj);
2049  out_remove_stats_kobj:
2050 #endif
2051         xfs_sysfs_del(&xfsstats.xs_kobj);
2052  out_free_stats:
2053         free_percpu(xfsstats.xs_stats);
2054  out_kset_unregister:
2055         kset_unregister(xfs_kset);
2056  out_sysctl_unregister:
2057         xfs_sysctl_unregister();
2058  out_cleanup_procfs:
2059         xfs_cleanup_procfs();
2060  out_buf_terminate:
2061         xfs_buf_terminate();
2062  out_mru_cache_uninit:
2063         xfs_mru_cache_uninit();
2064  out_destroy_wq:
2065         xfs_destroy_workqueues();
2066  out_destroy_zones:
2067         xfs_destroy_zones();
2068  out:
2069         return error;
2070 }
2071 
2072 STATIC void __exit
2073 exit_xfs_fs(void)
2074 {
2075         xfs_qm_exit();
2076         unregister_filesystem(&xfs_fs_type);
2077 #ifdef DEBUG
2078         xfs_sysfs_del(&xfs_dbg_kobj);
2079 #endif
2080         xfs_sysfs_del(&xfsstats.xs_kobj);
2081         free_percpu(xfsstats.xs_stats);
2082         kset_unregister(xfs_kset);
2083         xfs_sysctl_unregister();
2084         xfs_cleanup_procfs();
2085         xfs_buf_terminate();
2086         xfs_mru_cache_uninit();
2087         xfs_destroy_workqueues();
2088         xfs_destroy_zones();
2089         xfs_uuid_table_free();
2090 }
2091 
2092 module_init(init_xfs_fs);
2093 module_exit(exit_xfs_fs);
2094 
2095 MODULE_AUTHOR("Silicon Graphics, Inc.");
2096 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2097 MODULE_LICENSE("GPL");
2098 

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