Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

Linux/fs/xfs/xfs_super.c

  1 /*
  2  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
  3  * All Rights Reserved.
  4  *
  5  * This program is free software; you can redistribute it and/or
  6  * modify it under the terms of the GNU General Public License as
  7  * published by the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it would be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, write the Free Software Foundation,
 16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 17  */
 18 
 19 #include "xfs.h"
 20 #include "xfs_shared.h"
 21 #include "xfs_format.h"
 22 #include "xfs_log_format.h"
 23 #include "xfs_trans_resv.h"
 24 #include "xfs_sb.h"
 25 #include "xfs_mount.h"
 26 #include "xfs_da_format.h"
 27 #include "xfs_inode.h"
 28 #include "xfs_btree.h"
 29 #include "xfs_bmap.h"
 30 #include "xfs_alloc.h"
 31 #include "xfs_error.h"
 32 #include "xfs_fsops.h"
 33 #include "xfs_trans.h"
 34 #include "xfs_buf_item.h"
 35 #include "xfs_log.h"
 36 #include "xfs_log_priv.h"
 37 #include "xfs_da_btree.h"
 38 #include "xfs_dir2.h"
 39 #include "xfs_extfree_item.h"
 40 #include "xfs_mru_cache.h"
 41 #include "xfs_inode_item.h"
 42 #include "xfs_icache.h"
 43 #include "xfs_trace.h"
 44 #include "xfs_icreate_item.h"
 45 #include "xfs_filestream.h"
 46 #include "xfs_quota.h"
 47 #include "xfs_sysfs.h"
 48 
 49 #include <linux/namei.h>
 50 #include <linux/init.h>
 51 #include <linux/slab.h>
 52 #include <linux/mount.h>
 53 #include <linux/mempool.h>
 54 #include <linux/writeback.h>
 55 #include <linux/kthread.h>
 56 #include <linux/freezer.h>
 57 #include <linux/parser.h>
 58 
 59 static const struct super_operations xfs_super_operations;
 60 static kmem_zone_t *xfs_ioend_zone;
 61 mempool_t *xfs_ioend_pool;
 62 
 63 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
 64 #ifdef DEBUG
 65 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
 66 #endif
 67 
 68 #define MNTOPT_LOGBUFS  "logbufs"       /* number of XFS log buffers */
 69 #define MNTOPT_LOGBSIZE "logbsize"      /* size of XFS log buffers */
 70 #define MNTOPT_LOGDEV   "logdev"        /* log device */
 71 #define MNTOPT_RTDEV    "rtdev"         /* realtime I/O device */
 72 #define MNTOPT_BIOSIZE  "biosize"       /* log2 of preferred buffered io size */
 73 #define MNTOPT_WSYNC    "wsync"         /* safe-mode nfs compatible mount */
 74 #define MNTOPT_NOALIGN  "noalign"       /* turn off stripe alignment */
 75 #define MNTOPT_SWALLOC  "swalloc"       /* turn on stripe width allocation */
 76 #define MNTOPT_SUNIT    "sunit"         /* data volume stripe unit */
 77 #define MNTOPT_SWIDTH   "swidth"        /* data volume stripe width */
 78 #define MNTOPT_NOUUID   "nouuid"        /* ignore filesystem UUID */
 79 #define MNTOPT_MTPT     "mtpt"          /* filesystem mount point */
 80 #define MNTOPT_GRPID    "grpid"         /* group-ID from parent directory */
 81 #define MNTOPT_NOGRPID  "nogrpid"       /* group-ID from current process */
 82 #define MNTOPT_BSDGROUPS    "bsdgroups"    /* group-ID from parent directory */
 83 #define MNTOPT_SYSVGROUPS   "sysvgroups"   /* group-ID from current process */
 84 #define MNTOPT_ALLOCSIZE    "allocsize"    /* preferred allocation size */
 85 #define MNTOPT_NORECOVERY   "norecovery"   /* don't run XFS recovery */
 86 #define MNTOPT_BARRIER  "barrier"       /* use writer barriers for log write and
 87                                          * unwritten extent conversion */
 88 #define MNTOPT_NOBARRIER "nobarrier"    /* .. disable */
 89 #define MNTOPT_64BITINODE   "inode64"   /* inodes can be allocated anywhere */
 90 #define MNTOPT_32BITINODE   "inode32"   /* inode allocation limited to
 91                                          * XFS_MAXINUMBER_32 */
 92 #define MNTOPT_IKEEP    "ikeep"         /* do not free empty inode clusters */
 93 #define MNTOPT_NOIKEEP  "noikeep"       /* free empty inode clusters */
 94 #define MNTOPT_LARGEIO     "largeio"    /* report large I/O sizes in stat() */
 95 #define MNTOPT_NOLARGEIO   "nolargeio"  /* do not report large I/O sizes
 96                                          * in stat(). */
 97 #define MNTOPT_ATTR2    "attr2"         /* do use attr2 attribute format */
 98 #define MNTOPT_NOATTR2  "noattr2"       /* do not use attr2 attribute format */
 99 #define MNTOPT_FILESTREAM  "filestreams" /* use filestreams allocator */
100 #define MNTOPT_QUOTA    "quota"         /* disk quotas (user) */
101 #define MNTOPT_NOQUOTA  "noquota"       /* no quotas */
102 #define MNTOPT_USRQUOTA "usrquota"      /* user quota enabled */
103 #define MNTOPT_GRPQUOTA "grpquota"      /* group quota enabled */
104 #define MNTOPT_PRJQUOTA "prjquota"      /* project quota enabled */
105 #define MNTOPT_UQUOTA   "uquota"        /* user quota (IRIX variant) */
106 #define MNTOPT_GQUOTA   "gquota"        /* group quota (IRIX variant) */
107 #define MNTOPT_PQUOTA   "pquota"        /* project quota (IRIX variant) */
108 #define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */
109 #define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */
110 #define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */
111 #define MNTOPT_QUOTANOENF  "qnoenforce" /* same as uqnoenforce */
112 #define MNTOPT_DISCARD     "discard"    /* Discard unused blocks */
113 #define MNTOPT_NODISCARD   "nodiscard"  /* Do not discard unused blocks */
114 
115 #define MNTOPT_DAX      "dax"           /* Enable direct access to bdev pages */
116 
117 /*
118  * Table driven mount option parser.
119  *
120  * Currently only used for remount, but it will be used for mount
121  * in the future, too.
122  */
123 enum {
124         Opt_barrier,
125         Opt_nobarrier,
126         Opt_inode64,
127         Opt_inode32,
128         Opt_err
129 };
130 
131 static const match_table_t tokens = {
132         {Opt_barrier, "barrier"},
133         {Opt_nobarrier, "nobarrier"},
134         {Opt_inode64, "inode64"},
135         {Opt_inode32, "inode32"},
136         {Opt_err, NULL}
137 };
138 
139 
140 STATIC unsigned long
141 suffix_kstrtoint(char *s, unsigned int base, int *res)
142 {
143         int     last, shift_left_factor = 0, _res;
144         char    *value = s;
145 
146         last = strlen(value) - 1;
147         if (value[last] == 'K' || value[last] == 'k') {
148                 shift_left_factor = 10;
149                 value[last] = '\0';
150         }
151         if (value[last] == 'M' || value[last] == 'm') {
152                 shift_left_factor = 20;
153                 value[last] = '\0';
154         }
155         if (value[last] == 'G' || value[last] == 'g') {
156                 shift_left_factor = 30;
157                 value[last] = '\0';
158         }
159 
160         if (kstrtoint(s, base, &_res))
161                 return -EINVAL;
162         *res = _res << shift_left_factor;
163         return 0;
164 }
165 
166 /*
167  * This function fills in xfs_mount_t fields based on mount args.
168  * Note: the superblock has _not_ yet been read in.
169  *
170  * Note that this function leaks the various device name allocations on
171  * failure.  The caller takes care of them.
172  */
173 STATIC int
174 xfs_parseargs(
175         struct xfs_mount        *mp,
176         char                    *options)
177 {
178         struct super_block      *sb = mp->m_super;
179         char                    *this_char, *value;
180         int                     dsunit = 0;
181         int                     dswidth = 0;
182         int                     iosize = 0;
183         __uint8_t               iosizelog = 0;
184 
185         /*
186          * set up the mount name first so all the errors will refer to the
187          * correct device.
188          */
189         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
190         if (!mp->m_fsname)
191                 return -ENOMEM;
192         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
193 
194         /*
195          * Copy binary VFS mount flags we are interested in.
196          */
197         if (sb->s_flags & MS_RDONLY)
198                 mp->m_flags |= XFS_MOUNT_RDONLY;
199         if (sb->s_flags & MS_DIRSYNC)
200                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
201         if (sb->s_flags & MS_SYNCHRONOUS)
202                 mp->m_flags |= XFS_MOUNT_WSYNC;
203 
204         /*
205          * Set some default flags that could be cleared by the mount option
206          * parsing.
207          */
208         mp->m_flags |= XFS_MOUNT_BARRIER;
209         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
210 
211         /*
212          * These can be overridden by the mount option parsing.
213          */
214         mp->m_logbufs = -1;
215         mp->m_logbsize = -1;
216 
217         if (!options)
218                 goto done;
219 
220         while ((this_char = strsep(&options, ",")) != NULL) {
221                 if (!*this_char)
222                         continue;
223                 if ((value = strchr(this_char, '=')) != NULL)
224                         *value++ = 0;
225 
226                 if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
227                         if (!value || !*value) {
228                                 xfs_warn(mp, "%s option requires an argument",
229                                         this_char);
230                                 return -EINVAL;
231                         }
232                         if (kstrtoint(value, 10, &mp->m_logbufs))
233                                 return -EINVAL;
234                 } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
235                         if (!value || !*value) {
236                                 xfs_warn(mp, "%s option requires an argument",
237                                         this_char);
238                                 return -EINVAL;
239                         }
240                         if (suffix_kstrtoint(value, 10, &mp->m_logbsize))
241                                 return -EINVAL;
242                 } else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
243                         if (!value || !*value) {
244                                 xfs_warn(mp, "%s option requires an argument",
245                                         this_char);
246                                 return -EINVAL;
247                         }
248                         mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
249                         if (!mp->m_logname)
250                                 return -ENOMEM;
251                 } else if (!strcmp(this_char, MNTOPT_MTPT)) {
252                         xfs_warn(mp, "%s option not allowed on this system",
253                                 this_char);
254                         return -EINVAL;
255                 } else if (!strcmp(this_char, MNTOPT_RTDEV)) {
256                         if (!value || !*value) {
257                                 xfs_warn(mp, "%s option requires an argument",
258                                         this_char);
259                                 return -EINVAL;
260                         }
261                         mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
262                         if (!mp->m_rtname)
263                                 return -ENOMEM;
264                 } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
265                         if (!value || !*value) {
266                                 xfs_warn(mp, "%s option requires an argument",
267                                         this_char);
268                                 return -EINVAL;
269                         }
270                         if (kstrtoint(value, 10, &iosize))
271                                 return -EINVAL;
272                         iosizelog = ffs(iosize) - 1;
273                 } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
274                         if (!value || !*value) {
275                                 xfs_warn(mp, "%s option requires an argument",
276                                         this_char);
277                                 return -EINVAL;
278                         }
279                         if (suffix_kstrtoint(value, 10, &iosize))
280                                 return -EINVAL;
281                         iosizelog = ffs(iosize) - 1;
282                 } else if (!strcmp(this_char, MNTOPT_GRPID) ||
283                            !strcmp(this_char, MNTOPT_BSDGROUPS)) {
284                         mp->m_flags |= XFS_MOUNT_GRPID;
285                 } else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
286                            !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
287                         mp->m_flags &= ~XFS_MOUNT_GRPID;
288                 } else if (!strcmp(this_char, MNTOPT_WSYNC)) {
289                         mp->m_flags |= XFS_MOUNT_WSYNC;
290                 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
291                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
292                 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
293                         mp->m_flags |= XFS_MOUNT_NOALIGN;
294                 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
295                         mp->m_flags |= XFS_MOUNT_SWALLOC;
296                 } else if (!strcmp(this_char, MNTOPT_SUNIT)) {
297                         if (!value || !*value) {
298                                 xfs_warn(mp, "%s option requires an argument",
299                                         this_char);
300                                 return -EINVAL;
301                         }
302                         if (kstrtoint(value, 10, &dsunit))
303                                 return -EINVAL;
304                 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
305                         if (!value || !*value) {
306                                 xfs_warn(mp, "%s option requires an argument",
307                                         this_char);
308                                 return -EINVAL;
309                         }
310                         if (kstrtoint(value, 10, &dswidth))
311                                 return -EINVAL;
312                 } else if (!strcmp(this_char, MNTOPT_32BITINODE)) {
313                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
314                 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
315                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
316                 } else if (!strcmp(this_char, MNTOPT_NOUUID)) {
317                         mp->m_flags |= XFS_MOUNT_NOUUID;
318                 } else if (!strcmp(this_char, MNTOPT_BARRIER)) {
319                         mp->m_flags |= XFS_MOUNT_BARRIER;
320                 } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
321                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
322                 } else if (!strcmp(this_char, MNTOPT_IKEEP)) {
323                         mp->m_flags |= XFS_MOUNT_IKEEP;
324                 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
325                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
326                 } else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
327                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
328                 } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
329                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
330                 } else if (!strcmp(this_char, MNTOPT_ATTR2)) {
331                         mp->m_flags |= XFS_MOUNT_ATTR2;
332                 } else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
333                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
334                         mp->m_flags |= XFS_MOUNT_NOATTR2;
335                 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
336                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
337                 } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
338                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
339                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
340                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
341                 } else if (!strcmp(this_char, MNTOPT_QUOTA) ||
342                            !strcmp(this_char, MNTOPT_UQUOTA) ||
343                            !strcmp(this_char, MNTOPT_USRQUOTA)) {
344                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
345                                          XFS_UQUOTA_ENFD);
346                 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
347                            !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
348                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
349                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
350                 } else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
351                            !strcmp(this_char, MNTOPT_PRJQUOTA)) {
352                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
353                                          XFS_PQUOTA_ENFD);
354                 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
355                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
356                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
357                 } else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
358                            !strcmp(this_char, MNTOPT_GRPQUOTA)) {
359                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
360                                          XFS_GQUOTA_ENFD);
361                 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
362                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
363                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
364                 } else if (!strcmp(this_char, MNTOPT_DISCARD)) {
365                         mp->m_flags |= XFS_MOUNT_DISCARD;
366                 } else if (!strcmp(this_char, MNTOPT_NODISCARD)) {
367                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
368 #ifdef CONFIG_FS_DAX
369                 } else if (!strcmp(this_char, MNTOPT_DAX)) {
370                         mp->m_flags |= XFS_MOUNT_DAX;
371 #endif
372                 } else {
373                         xfs_warn(mp, "unknown mount option [%s].", this_char);
374                         return -EINVAL;
375                 }
376         }
377 
378         /*
379          * no recovery flag requires a read-only mount
380          */
381         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
382             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
383                 xfs_warn(mp, "no-recovery mounts must be read-only.");
384                 return -EINVAL;
385         }
386 
387         if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
388                 xfs_warn(mp,
389         "sunit and swidth options incompatible with the noalign option");
390                 return -EINVAL;
391         }
392 
393 #ifndef CONFIG_XFS_QUOTA
394         if (XFS_IS_QUOTA_RUNNING(mp)) {
395                 xfs_warn(mp, "quota support not available in this kernel.");
396                 return -EINVAL;
397         }
398 #endif
399 
400         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
401                 xfs_warn(mp, "sunit and swidth must be specified together");
402                 return -EINVAL;
403         }
404 
405         if (dsunit && (dswidth % dsunit != 0)) {
406                 xfs_warn(mp,
407         "stripe width (%d) must be a multiple of the stripe unit (%d)",
408                         dswidth, dsunit);
409                 return -EINVAL;
410         }
411 
412 done:
413         if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
414                 /*
415                  * At this point the superblock has not been read
416                  * in, therefore we do not know the block size.
417                  * Before the mount call ends we will convert
418                  * these to FSBs.
419                  */
420                 mp->m_dalign = dsunit;
421                 mp->m_swidth = dswidth;
422         }
423 
424         if (mp->m_logbufs != -1 &&
425             mp->m_logbufs != 0 &&
426             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
427              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
428                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
429                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
430                 return -EINVAL;
431         }
432         if (mp->m_logbsize != -1 &&
433             mp->m_logbsize !=  0 &&
434             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
435              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
436              !is_power_of_2(mp->m_logbsize))) {
437                 xfs_warn(mp,
438                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
439                         mp->m_logbsize);
440                 return -EINVAL;
441         }
442 
443         if (iosizelog) {
444                 if (iosizelog > XFS_MAX_IO_LOG ||
445                     iosizelog < XFS_MIN_IO_LOG) {
446                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
447                                 iosizelog, XFS_MIN_IO_LOG,
448                                 XFS_MAX_IO_LOG);
449                         return -EINVAL;
450                 }
451 
452                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
453                 mp->m_readio_log = iosizelog;
454                 mp->m_writeio_log = iosizelog;
455         }
456 
457         return 0;
458 }
459 
460 struct proc_xfs_info {
461         uint64_t        flag;
462         char            *str;
463 };
464 
465 STATIC int
466 xfs_showargs(
467         struct xfs_mount        *mp,
468         struct seq_file         *m)
469 {
470         static struct proc_xfs_info xfs_info_set[] = {
471                 /* the few simple ones we can get from the mount struct */
472                 { XFS_MOUNT_IKEEP,              "," MNTOPT_IKEEP },
473                 { XFS_MOUNT_WSYNC,              "," MNTOPT_WSYNC },
474                 { XFS_MOUNT_NOALIGN,            "," MNTOPT_NOALIGN },
475                 { XFS_MOUNT_SWALLOC,            "," MNTOPT_SWALLOC },
476                 { XFS_MOUNT_NOUUID,             "," MNTOPT_NOUUID },
477                 { XFS_MOUNT_NORECOVERY,         "," MNTOPT_NORECOVERY },
478                 { XFS_MOUNT_ATTR2,              "," MNTOPT_ATTR2 },
479                 { XFS_MOUNT_FILESTREAMS,        "," MNTOPT_FILESTREAM },
480                 { XFS_MOUNT_GRPID,              "," MNTOPT_GRPID },
481                 { XFS_MOUNT_DISCARD,            "," MNTOPT_DISCARD },
482                 { XFS_MOUNT_SMALL_INUMS,        "," MNTOPT_32BITINODE },
483                 { XFS_MOUNT_DAX,                "," MNTOPT_DAX },
484                 { 0, NULL }
485         };
486         static struct proc_xfs_info xfs_info_unset[] = {
487                 /* the few simple ones we can get from the mount struct */
488                 { XFS_MOUNT_COMPAT_IOSIZE,      "," MNTOPT_LARGEIO },
489                 { XFS_MOUNT_BARRIER,            "," MNTOPT_NOBARRIER },
490                 { XFS_MOUNT_SMALL_INUMS,        "," MNTOPT_64BITINODE },
491                 { 0, NULL }
492         };
493         struct proc_xfs_info    *xfs_infop;
494 
495         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
496                 if (mp->m_flags & xfs_infop->flag)
497                         seq_puts(m, xfs_infop->str);
498         }
499         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
500                 if (!(mp->m_flags & xfs_infop->flag))
501                         seq_puts(m, xfs_infop->str);
502         }
503 
504         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
505                 seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk",
506                                 (int)(1 << mp->m_writeio_log) >> 10);
507 
508         if (mp->m_logbufs > 0)
509                 seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
510         if (mp->m_logbsize > 0)
511                 seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10);
512 
513         if (mp->m_logname)
514                 seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname);
515         if (mp->m_rtname)
516                 seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname);
517 
518         if (mp->m_dalign > 0)
519                 seq_printf(m, "," MNTOPT_SUNIT "=%d",
520                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
521         if (mp->m_swidth > 0)
522                 seq_printf(m, "," MNTOPT_SWIDTH "=%d",
523                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
524 
525         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
526                 seq_puts(m, "," MNTOPT_USRQUOTA);
527         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
528                 seq_puts(m, "," MNTOPT_UQUOTANOENF);
529 
530         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
531                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
532                         seq_puts(m, "," MNTOPT_PRJQUOTA);
533                 else
534                         seq_puts(m, "," MNTOPT_PQUOTANOENF);
535         }
536         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
537                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
538                         seq_puts(m, "," MNTOPT_GRPQUOTA);
539                 else
540                         seq_puts(m, "," MNTOPT_GQUOTANOENF);
541         }
542 
543         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
544                 seq_puts(m, "," MNTOPT_NOQUOTA);
545 
546         return 0;
547 }
548 __uint64_t
549 xfs_max_file_offset(
550         unsigned int            blockshift)
551 {
552         unsigned int            pagefactor = 1;
553         unsigned int            bitshift = BITS_PER_LONG - 1;
554 
555         /* Figure out maximum filesize, on Linux this can depend on
556          * the filesystem blocksize (on 32 bit platforms).
557          * __block_write_begin does this in an [unsigned] long...
558          *      page->index << (PAGE_CACHE_SHIFT - bbits)
559          * So, for page sized blocks (4K on 32 bit platforms),
560          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
561          *      (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
562          * but for smaller blocksizes it is less (bbits = log2 bsize).
563          * Note1: get_block_t takes a long (implicit cast from above)
564          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
565          * can optionally convert the [unsigned] long from above into
566          * an [unsigned] long long.
567          */
568 
569 #if BITS_PER_LONG == 32
570 # if defined(CONFIG_LBDAF)
571         ASSERT(sizeof(sector_t) == 8);
572         pagefactor = PAGE_CACHE_SIZE;
573         bitshift = BITS_PER_LONG;
574 # else
575         pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
576 # endif
577 #endif
578 
579         return (((__uint64_t)pagefactor) << bitshift) - 1;
580 }
581 
582 /*
583  * xfs_set_inode32() and xfs_set_inode64() are passed an agcount
584  * because in the growfs case, mp->m_sb.sb_agcount is not updated
585  * yet to the potentially higher ag count.
586  */
587 xfs_agnumber_t
588 xfs_set_inode32(struct xfs_mount *mp, xfs_agnumber_t agcount)
589 {
590         xfs_agnumber_t  index = 0;
591         xfs_agnumber_t  maxagi = 0;
592         xfs_sb_t        *sbp = &mp->m_sb;
593         xfs_agnumber_t  max_metadata;
594         xfs_agino_t     agino;
595         xfs_ino_t       ino;
596         xfs_perag_t     *pag;
597 
598         /* Calculate how much should be reserved for inodes to meet
599          * the max inode percentage.
600          */
601         if (mp->m_maxicount) {
602                 __uint64_t      icount;
603 
604                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
605                 do_div(icount, 100);
606                 icount += sbp->sb_agblocks - 1;
607                 do_div(icount, sbp->sb_agblocks);
608                 max_metadata = icount;
609         } else {
610                 max_metadata = agcount;
611         }
612 
613         agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
614 
615         for (index = 0; index < agcount; index++) {
616                 ino = XFS_AGINO_TO_INO(mp, index, agino);
617 
618                 if (ino > XFS_MAXINUMBER_32) {
619                         pag = xfs_perag_get(mp, index);
620                         pag->pagi_inodeok = 0;
621                         pag->pagf_metadata = 0;
622                         xfs_perag_put(pag);
623                         continue;
624                 }
625 
626                 pag = xfs_perag_get(mp, index);
627                 pag->pagi_inodeok = 1;
628                 maxagi++;
629                 if (index < max_metadata)
630                         pag->pagf_metadata = 1;
631                 xfs_perag_put(pag);
632         }
633         mp->m_flags |= (XFS_MOUNT_32BITINODES |
634                         XFS_MOUNT_SMALL_INUMS);
635 
636         return maxagi;
637 }
638 
639 xfs_agnumber_t
640 xfs_set_inode64(struct xfs_mount *mp, xfs_agnumber_t agcount)
641 {
642         xfs_agnumber_t index = 0;
643 
644         for (index = 0; index < agcount; index++) {
645                 struct xfs_perag        *pag;
646 
647                 pag = xfs_perag_get(mp, index);
648                 pag->pagi_inodeok = 1;
649                 pag->pagf_metadata = 0;
650                 xfs_perag_put(pag);
651         }
652 
653         /* There is no need for lock protection on m_flags,
654          * the rw_semaphore of the VFS superblock is locked
655          * during mount/umount/remount operations, so this is
656          * enough to avoid concurency on the m_flags field
657          */
658         mp->m_flags &= ~(XFS_MOUNT_32BITINODES |
659                          XFS_MOUNT_SMALL_INUMS);
660         return index;
661 }
662 
663 STATIC int
664 xfs_blkdev_get(
665         xfs_mount_t             *mp,
666         const char              *name,
667         struct block_device     **bdevp)
668 {
669         int                     error = 0;
670 
671         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
672                                     mp);
673         if (IS_ERR(*bdevp)) {
674                 error = PTR_ERR(*bdevp);
675                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
676         }
677 
678         return error;
679 }
680 
681 STATIC void
682 xfs_blkdev_put(
683         struct block_device     *bdev)
684 {
685         if (bdev)
686                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
687 }
688 
689 void
690 xfs_blkdev_issue_flush(
691         xfs_buftarg_t           *buftarg)
692 {
693         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
694 }
695 
696 STATIC void
697 xfs_close_devices(
698         struct xfs_mount        *mp)
699 {
700         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
701                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
702                 xfs_free_buftarg(mp, mp->m_logdev_targp);
703                 xfs_blkdev_put(logdev);
704         }
705         if (mp->m_rtdev_targp) {
706                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
707                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
708                 xfs_blkdev_put(rtdev);
709         }
710         xfs_free_buftarg(mp, mp->m_ddev_targp);
711 }
712 
713 /*
714  * The file system configurations are:
715  *      (1) device (partition) with data and internal log
716  *      (2) logical volume with data and log subvolumes.
717  *      (3) logical volume with data, log, and realtime subvolumes.
718  *
719  * We only have to handle opening the log and realtime volumes here if
720  * they are present.  The data subvolume has already been opened by
721  * get_sb_bdev() and is stored in sb->s_bdev.
722  */
723 STATIC int
724 xfs_open_devices(
725         struct xfs_mount        *mp)
726 {
727         struct block_device     *ddev = mp->m_super->s_bdev;
728         struct block_device     *logdev = NULL, *rtdev = NULL;
729         int                     error;
730 
731         /*
732          * Open real time and log devices - order is important.
733          */
734         if (mp->m_logname) {
735                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
736                 if (error)
737                         goto out;
738         }
739 
740         if (mp->m_rtname) {
741                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
742                 if (error)
743                         goto out_close_logdev;
744 
745                 if (rtdev == ddev || rtdev == logdev) {
746                         xfs_warn(mp,
747         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
748                         error = -EINVAL;
749                         goto out_close_rtdev;
750                 }
751         }
752 
753         /*
754          * Setup xfs_mount buffer target pointers
755          */
756         error = -ENOMEM;
757         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev);
758         if (!mp->m_ddev_targp)
759                 goto out_close_rtdev;
760 
761         if (rtdev) {
762                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev);
763                 if (!mp->m_rtdev_targp)
764                         goto out_free_ddev_targ;
765         }
766 
767         if (logdev && logdev != ddev) {
768                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
769                 if (!mp->m_logdev_targp)
770                         goto out_free_rtdev_targ;
771         } else {
772                 mp->m_logdev_targp = mp->m_ddev_targp;
773         }
774 
775         return 0;
776 
777  out_free_rtdev_targ:
778         if (mp->m_rtdev_targp)
779                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
780  out_free_ddev_targ:
781         xfs_free_buftarg(mp, mp->m_ddev_targp);
782  out_close_rtdev:
783         xfs_blkdev_put(rtdev);
784  out_close_logdev:
785         if (logdev && logdev != ddev)
786                 xfs_blkdev_put(logdev);
787  out:
788         return error;
789 }
790 
791 /*
792  * Setup xfs_mount buffer target pointers based on superblock
793  */
794 STATIC int
795 xfs_setup_devices(
796         struct xfs_mount        *mp)
797 {
798         int                     error;
799 
800         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
801         if (error)
802                 return error;
803 
804         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
805                 unsigned int    log_sector_size = BBSIZE;
806 
807                 if (xfs_sb_version_hassector(&mp->m_sb))
808                         log_sector_size = mp->m_sb.sb_logsectsize;
809                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
810                                             log_sector_size);
811                 if (error)
812                         return error;
813         }
814         if (mp->m_rtdev_targp) {
815                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
816                                             mp->m_sb.sb_sectsize);
817                 if (error)
818                         return error;
819         }
820 
821         return 0;
822 }
823 
824 STATIC int
825 xfs_init_mount_workqueues(
826         struct xfs_mount        *mp)
827 {
828         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
829                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
830         if (!mp->m_buf_workqueue)
831                 goto out;
832 
833         mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
834                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
835         if (!mp->m_data_workqueue)
836                 goto out_destroy_buf;
837 
838         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
839                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
840         if (!mp->m_unwritten_workqueue)
841                 goto out_destroy_data_iodone_queue;
842 
843         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
844                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
845         if (!mp->m_cil_workqueue)
846                 goto out_destroy_unwritten;
847 
848         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
849                         WQ_FREEZABLE, 0, mp->m_fsname);
850         if (!mp->m_reclaim_workqueue)
851                 goto out_destroy_cil;
852 
853         mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
854                         WQ_FREEZABLE|WQ_HIGHPRI, 0, mp->m_fsname);
855         if (!mp->m_log_workqueue)
856                 goto out_destroy_reclaim;
857 
858         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
859                         WQ_FREEZABLE, 0, mp->m_fsname);
860         if (!mp->m_eofblocks_workqueue)
861                 goto out_destroy_log;
862 
863         return 0;
864 
865 out_destroy_log:
866         destroy_workqueue(mp->m_log_workqueue);
867 out_destroy_reclaim:
868         destroy_workqueue(mp->m_reclaim_workqueue);
869 out_destroy_cil:
870         destroy_workqueue(mp->m_cil_workqueue);
871 out_destroy_unwritten:
872         destroy_workqueue(mp->m_unwritten_workqueue);
873 out_destroy_data_iodone_queue:
874         destroy_workqueue(mp->m_data_workqueue);
875 out_destroy_buf:
876         destroy_workqueue(mp->m_buf_workqueue);
877 out:
878         return -ENOMEM;
879 }
880 
881 STATIC void
882 xfs_destroy_mount_workqueues(
883         struct xfs_mount        *mp)
884 {
885         destroy_workqueue(mp->m_eofblocks_workqueue);
886         destroy_workqueue(mp->m_log_workqueue);
887         destroy_workqueue(mp->m_reclaim_workqueue);
888         destroy_workqueue(mp->m_cil_workqueue);
889         destroy_workqueue(mp->m_data_workqueue);
890         destroy_workqueue(mp->m_unwritten_workqueue);
891         destroy_workqueue(mp->m_buf_workqueue);
892 }
893 
894 /*
895  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
896  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
897  * for IO to complete so that we effectively throttle multiple callers to the
898  * rate at which IO is completing.
899  */
900 void
901 xfs_flush_inodes(
902         struct xfs_mount        *mp)
903 {
904         struct super_block      *sb = mp->m_super;
905 
906         if (down_read_trylock(&sb->s_umount)) {
907                 sync_inodes_sb(sb);
908                 up_read(&sb->s_umount);
909         }
910 }
911 
912 /* Catch misguided souls that try to use this interface on XFS */
913 STATIC struct inode *
914 xfs_fs_alloc_inode(
915         struct super_block      *sb)
916 {
917         BUG();
918         return NULL;
919 }
920 
921 /*
922  * Now that the generic code is guaranteed not to be accessing
923  * the linux inode, we can reclaim the inode.
924  */
925 STATIC void
926 xfs_fs_destroy_inode(
927         struct inode            *inode)
928 {
929         struct xfs_inode        *ip = XFS_I(inode);
930 
931         trace_xfs_destroy_inode(ip);
932 
933         XFS_STATS_INC(vn_reclaim);
934 
935         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
936 
937         /*
938          * We should never get here with one of the reclaim flags already set.
939          */
940         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
941         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
942 
943         /*
944          * We always use background reclaim here because even if the
945          * inode is clean, it still may be under IO and hence we have
946          * to take the flush lock. The background reclaim path handles
947          * this more efficiently than we can here, so simply let background
948          * reclaim tear down all inodes.
949          */
950         xfs_inode_set_reclaim_tag(ip);
951 }
952 
953 /*
954  * Slab object creation initialisation for the XFS inode.
955  * This covers only the idempotent fields in the XFS inode;
956  * all other fields need to be initialised on allocation
957  * from the slab. This avoids the need to repeatedly initialise
958  * fields in the xfs inode that left in the initialise state
959  * when freeing the inode.
960  */
961 STATIC void
962 xfs_fs_inode_init_once(
963         void                    *inode)
964 {
965         struct xfs_inode        *ip = inode;
966 
967         memset(ip, 0, sizeof(struct xfs_inode));
968 
969         /* vfs inode */
970         inode_init_once(VFS_I(ip));
971 
972         /* xfs inode */
973         atomic_set(&ip->i_pincount, 0);
974         spin_lock_init(&ip->i_flags_lock);
975 
976         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
977                      "xfsino", ip->i_ino);
978         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
979                      "xfsino", ip->i_ino);
980 }
981 
982 STATIC void
983 xfs_fs_evict_inode(
984         struct inode            *inode)
985 {
986         xfs_inode_t             *ip = XFS_I(inode);
987 
988         ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
989 
990         trace_xfs_evict_inode(ip);
991 
992         truncate_inode_pages_final(&inode->i_data);
993         clear_inode(inode);
994         XFS_STATS_INC(vn_rele);
995         XFS_STATS_INC(vn_remove);
996 
997         xfs_inactive(ip);
998 }
999 
1000 /*
1001  * We do an unlocked check for XFS_IDONTCACHE here because we are already
1002  * serialised against cache hits here via the inode->i_lock and igrab() in
1003  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
1004  * racing with us, and it avoids needing to grab a spinlock here for every inode
1005  * we drop the final reference on.
1006  */
1007 STATIC int
1008 xfs_fs_drop_inode(
1009         struct inode            *inode)
1010 {
1011         struct xfs_inode        *ip = XFS_I(inode);
1012 
1013         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1014 }
1015 
1016 STATIC void
1017 xfs_free_fsname(
1018         struct xfs_mount        *mp)
1019 {
1020         kfree(mp->m_fsname);
1021         kfree(mp->m_rtname);
1022         kfree(mp->m_logname);
1023 }
1024 
1025 STATIC int
1026 xfs_fs_sync_fs(
1027         struct super_block      *sb,
1028         int                     wait)
1029 {
1030         struct xfs_mount        *mp = XFS_M(sb);
1031 
1032         /*
1033          * Doing anything during the async pass would be counterproductive.
1034          */
1035         if (!wait)
1036                 return 0;
1037 
1038         xfs_log_force(mp, XFS_LOG_SYNC);
1039         if (laptop_mode) {
1040                 /*
1041                  * The disk must be active because we're syncing.
1042                  * We schedule log work now (now that the disk is
1043                  * active) instead of later (when it might not be).
1044                  */
1045                 flush_delayed_work(&mp->m_log->l_work);
1046         }
1047 
1048         return 0;
1049 }
1050 
1051 STATIC int
1052 xfs_fs_statfs(
1053         struct dentry           *dentry,
1054         struct kstatfs          *statp)
1055 {
1056         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1057         xfs_sb_t                *sbp = &mp->m_sb;
1058         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
1059         __uint64_t              fakeinos, id;
1060         __uint64_t              icount;
1061         __uint64_t              ifree;
1062         __uint64_t              fdblocks;
1063         xfs_extlen_t            lsize;
1064         __int64_t               ffree;
1065 
1066         statp->f_type = XFS_SB_MAGIC;
1067         statp->f_namelen = MAXNAMELEN - 1;
1068 
1069         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1070         statp->f_fsid.val[0] = (u32)id;
1071         statp->f_fsid.val[1] = (u32)(id >> 32);
1072 
1073         icount = percpu_counter_sum(&mp->m_icount);
1074         ifree = percpu_counter_sum(&mp->m_ifree);
1075         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1076 
1077         spin_lock(&mp->m_sb_lock);
1078         statp->f_bsize = sbp->sb_blocksize;
1079         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1080         statp->f_blocks = sbp->sb_dblocks - lsize;
1081         spin_unlock(&mp->m_sb_lock);
1082 
1083         statp->f_bfree = fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1084         statp->f_bavail = statp->f_bfree;
1085 
1086         fakeinos = statp->f_bfree << sbp->sb_inopblog;
1087         statp->f_files = MIN(icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1088         if (mp->m_maxicount)
1089                 statp->f_files = min_t(typeof(statp->f_files),
1090                                         statp->f_files,
1091                                         mp->m_maxicount);
1092 
1093         /* If sb_icount overshot maxicount, report actual allocation */
1094         statp->f_files = max_t(typeof(statp->f_files),
1095                                         statp->f_files,
1096                                         sbp->sb_icount);
1097 
1098         /* make sure statp->f_ffree does not underflow */
1099         ffree = statp->f_files - (icount - ifree);
1100         statp->f_ffree = max_t(__int64_t, ffree, 0);
1101 
1102 
1103         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1104             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1105                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1106                 xfs_qm_statvfs(ip, statp);
1107         return 0;
1108 }
1109 
1110 STATIC void
1111 xfs_save_resvblks(struct xfs_mount *mp)
1112 {
1113         __uint64_t resblks = 0;
1114 
1115         mp->m_resblks_save = mp->m_resblks;
1116         xfs_reserve_blocks(mp, &resblks, NULL);
1117 }
1118 
1119 STATIC void
1120 xfs_restore_resvblks(struct xfs_mount *mp)
1121 {
1122         __uint64_t resblks;
1123 
1124         if (mp->m_resblks_save) {
1125                 resblks = mp->m_resblks_save;
1126                 mp->m_resblks_save = 0;
1127         } else
1128                 resblks = xfs_default_resblks(mp);
1129 
1130         xfs_reserve_blocks(mp, &resblks, NULL);
1131 }
1132 
1133 /*
1134  * Trigger writeback of all the dirty metadata in the file system.
1135  *
1136  * This ensures that the metadata is written to their location on disk rather
1137  * than just existing in transactions in the log. This means after a quiesce
1138  * there is no log replay required to write the inodes to disk - this is the
1139  * primary difference between a sync and a quiesce.
1140  *
1141  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1142  * it is started again when appropriate.
1143  */
1144 static void
1145 xfs_quiesce_attr(
1146         struct xfs_mount        *mp)
1147 {
1148         int     error = 0;
1149 
1150         /* wait for all modifications to complete */
1151         while (atomic_read(&mp->m_active_trans) > 0)
1152                 delay(100);
1153 
1154         /* force the log to unpin objects from the now complete transactions */
1155         xfs_log_force(mp, XFS_LOG_SYNC);
1156 
1157         /* reclaim inodes to do any IO before the freeze completes */
1158         xfs_reclaim_inodes(mp, 0);
1159         xfs_reclaim_inodes(mp, SYNC_WAIT);
1160 
1161         /* Push the superblock and write an unmount record */
1162         error = xfs_log_sbcount(mp);
1163         if (error)
1164                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1165                                 "Frozen image may not be consistent.");
1166         /*
1167          * Just warn here till VFS can correctly support
1168          * read-only remount without racing.
1169          */
1170         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1171 
1172         xfs_log_quiesce(mp);
1173 }
1174 
1175 STATIC int
1176 xfs_fs_remount(
1177         struct super_block      *sb,
1178         int                     *flags,
1179         char                    *options)
1180 {
1181         struct xfs_mount        *mp = XFS_M(sb);
1182         xfs_sb_t                *sbp = &mp->m_sb;
1183         substring_t             args[MAX_OPT_ARGS];
1184         char                    *p;
1185         int                     error;
1186 
1187         sync_filesystem(sb);
1188         while ((p = strsep(&options, ",")) != NULL) {
1189                 int token;
1190 
1191                 if (!*p)
1192                         continue;
1193 
1194                 token = match_token(p, tokens, args);
1195                 switch (token) {
1196                 case Opt_barrier:
1197                         mp->m_flags |= XFS_MOUNT_BARRIER;
1198                         break;
1199                 case Opt_nobarrier:
1200                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
1201                         break;
1202                 case Opt_inode64:
1203                         mp->m_maxagi = xfs_set_inode64(mp, sbp->sb_agcount);
1204                         break;
1205                 case Opt_inode32:
1206                         mp->m_maxagi = xfs_set_inode32(mp, sbp->sb_agcount);
1207                         break;
1208                 default:
1209                         /*
1210                          * Logically we would return an error here to prevent
1211                          * users from believing they might have changed
1212                          * mount options using remount which can't be changed.
1213                          *
1214                          * But unfortunately mount(8) adds all options from
1215                          * mtab and fstab to the mount arguments in some cases
1216                          * so we can't blindly reject options, but have to
1217                          * check for each specified option if it actually
1218                          * differs from the currently set option and only
1219                          * reject it if that's the case.
1220                          *
1221                          * Until that is implemented we return success for
1222                          * every remount request, and silently ignore all
1223                          * options that we can't actually change.
1224                          */
1225 #if 0
1226                         xfs_info(mp,
1227                 "mount option \"%s\" not supported for remount", p);
1228                         return -EINVAL;
1229 #else
1230                         break;
1231 #endif
1232                 }
1233         }
1234 
1235         /* ro -> rw */
1236         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1237                 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1238                         xfs_warn(mp,
1239                 "ro->rw transition prohibited on norecovery mount");
1240                         return -EINVAL;
1241                 }
1242 
1243                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1244 
1245                 /*
1246                  * If this is the first remount to writeable state we
1247                  * might have some superblock changes to update.
1248                  */
1249                 if (mp->m_update_sb) {
1250                         error = xfs_sync_sb(mp, false);
1251                         if (error) {
1252                                 xfs_warn(mp, "failed to write sb changes");
1253                                 return error;
1254                         }
1255                         mp->m_update_sb = false;
1256                 }
1257 
1258                 /*
1259                  * Fill out the reserve pool if it is empty. Use the stashed
1260                  * value if it is non-zero, otherwise go with the default.
1261                  */
1262                 xfs_restore_resvblks(mp);
1263                 xfs_log_work_queue(mp);
1264         }
1265 
1266         /* rw -> ro */
1267         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1268                 /*
1269                  * Before we sync the metadata, we need to free up the reserve
1270                  * block pool so that the used block count in the superblock on
1271                  * disk is correct at the end of the remount. Stash the current
1272                  * reserve pool size so that if we get remounted rw, we can
1273                  * return it to the same size.
1274                  */
1275                 xfs_save_resvblks(mp);
1276                 xfs_quiesce_attr(mp);
1277                 mp->m_flags |= XFS_MOUNT_RDONLY;
1278         }
1279 
1280         return 0;
1281 }
1282 
1283 /*
1284  * Second stage of a freeze. The data is already frozen so we only
1285  * need to take care of the metadata. Once that's done sync the superblock
1286  * to the log to dirty it in case of a crash while frozen. This ensures that we
1287  * will recover the unlinked inode lists on the next mount.
1288  */
1289 STATIC int
1290 xfs_fs_freeze(
1291         struct super_block      *sb)
1292 {
1293         struct xfs_mount        *mp = XFS_M(sb);
1294 
1295         xfs_save_resvblks(mp);
1296         xfs_quiesce_attr(mp);
1297         return xfs_sync_sb(mp, true);
1298 }
1299 
1300 STATIC int
1301 xfs_fs_unfreeze(
1302         struct super_block      *sb)
1303 {
1304         struct xfs_mount        *mp = XFS_M(sb);
1305 
1306         xfs_restore_resvblks(mp);
1307         xfs_log_work_queue(mp);
1308         return 0;
1309 }
1310 
1311 STATIC int
1312 xfs_fs_show_options(
1313         struct seq_file         *m,
1314         struct dentry           *root)
1315 {
1316         return xfs_showargs(XFS_M(root->d_sb), m);
1317 }
1318 
1319 /*
1320  * This function fills in xfs_mount_t fields based on mount args.
1321  * Note: the superblock _has_ now been read in.
1322  */
1323 STATIC int
1324 xfs_finish_flags(
1325         struct xfs_mount        *mp)
1326 {
1327         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1328 
1329         /* Fail a mount where the logbuf is smaller than the log stripe */
1330         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1331                 if (mp->m_logbsize <= 0 &&
1332                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1333                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1334                 } else if (mp->m_logbsize > 0 &&
1335                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1336                         xfs_warn(mp,
1337                 "logbuf size must be greater than or equal to log stripe size");
1338                         return -EINVAL;
1339                 }
1340         } else {
1341                 /* Fail a mount if the logbuf is larger than 32K */
1342                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1343                         xfs_warn(mp,
1344                 "logbuf size for version 1 logs must be 16K or 32K");
1345                         return -EINVAL;
1346                 }
1347         }
1348 
1349         /*
1350          * V5 filesystems always use attr2 format for attributes.
1351          */
1352         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1353             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1354                 xfs_warn(mp,
1355 "Cannot mount a V5 filesystem as %s. %s is always enabled for V5 filesystems.",
1356                         MNTOPT_NOATTR2, MNTOPT_ATTR2);
1357                 return -EINVAL;
1358         }
1359 
1360         /*
1361          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1362          * told by noattr2 to turn it off
1363          */
1364         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1365             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1366                 mp->m_flags |= XFS_MOUNT_ATTR2;
1367 
1368         /*
1369          * prohibit r/w mounts of read-only filesystems
1370          */
1371         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1372                 xfs_warn(mp,
1373                         "cannot mount a read-only filesystem as read-write");
1374                 return -EROFS;
1375         }
1376 
1377         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1378             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1379             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1380                 xfs_warn(mp,
1381                   "Super block does not support project and group quota together");
1382                 return -EINVAL;
1383         }
1384 
1385         return 0;
1386 }
1387 
1388 static int
1389 xfs_init_percpu_counters(
1390         struct xfs_mount        *mp)
1391 {
1392         int             error;
1393 
1394         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1395         if (error)
1396                 return -ENOMEM;
1397 
1398         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1399         if (error)
1400                 goto free_icount;
1401 
1402         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1403         if (error)
1404                 goto free_ifree;
1405 
1406         return 0;
1407 
1408 free_ifree:
1409         percpu_counter_destroy(&mp->m_ifree);
1410 free_icount:
1411         percpu_counter_destroy(&mp->m_icount);
1412         return -ENOMEM;
1413 }
1414 
1415 void
1416 xfs_reinit_percpu_counters(
1417         struct xfs_mount        *mp)
1418 {
1419         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1420         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1421         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1422 }
1423 
1424 static void
1425 xfs_destroy_percpu_counters(
1426         struct xfs_mount        *mp)
1427 {
1428         percpu_counter_destroy(&mp->m_icount);
1429         percpu_counter_destroy(&mp->m_ifree);
1430         percpu_counter_destroy(&mp->m_fdblocks);
1431 }
1432 
1433 STATIC int
1434 xfs_fs_fill_super(
1435         struct super_block      *sb,
1436         void                    *data,
1437         int                     silent)
1438 {
1439         struct inode            *root;
1440         struct xfs_mount        *mp = NULL;
1441         int                     flags = 0, error = -ENOMEM;
1442 
1443         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1444         if (!mp)
1445                 goto out;
1446 
1447         spin_lock_init(&mp->m_sb_lock);
1448         mutex_init(&mp->m_growlock);
1449         atomic_set(&mp->m_active_trans, 0);
1450         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1451         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1452         mp->m_kobj.kobject.kset = xfs_kset;
1453 
1454         mp->m_super = sb;
1455         sb->s_fs_info = mp;
1456 
1457         error = xfs_parseargs(mp, (char *)data);
1458         if (error)
1459                 goto out_free_fsname;
1460 
1461         sb_min_blocksize(sb, BBSIZE);
1462         sb->s_xattr = xfs_xattr_handlers;
1463         sb->s_export_op = &xfs_export_operations;
1464 #ifdef CONFIG_XFS_QUOTA
1465         sb->s_qcop = &xfs_quotactl_operations;
1466         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1467 #endif
1468         sb->s_op = &xfs_super_operations;
1469 
1470         if (silent)
1471                 flags |= XFS_MFSI_QUIET;
1472 
1473         error = xfs_open_devices(mp);
1474         if (error)
1475                 goto out_free_fsname;
1476 
1477         error = xfs_init_mount_workqueues(mp);
1478         if (error)
1479                 goto out_close_devices;
1480 
1481         error = xfs_init_percpu_counters(mp);
1482         if (error)
1483                 goto out_destroy_workqueues;
1484 
1485         error = xfs_readsb(mp, flags);
1486         if (error)
1487                 goto out_destroy_counters;
1488 
1489         error = xfs_finish_flags(mp);
1490         if (error)
1491                 goto out_free_sb;
1492 
1493         error = xfs_setup_devices(mp);
1494         if (error)
1495                 goto out_free_sb;
1496 
1497         error = xfs_filestream_mount(mp);
1498         if (error)
1499                 goto out_free_sb;
1500 
1501         /*
1502          * we must configure the block size in the superblock before we run the
1503          * full mount process as the mount process can lookup and cache inodes.
1504          */
1505         sb->s_magic = XFS_SB_MAGIC;
1506         sb->s_blocksize = mp->m_sb.sb_blocksize;
1507         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1508         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1509         sb->s_max_links = XFS_MAXLINK;
1510         sb->s_time_gran = 1;
1511         set_posix_acl_flag(sb);
1512 
1513         /* version 5 superblocks support inode version counters. */
1514         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1515                 sb->s_flags |= MS_I_VERSION;
1516 
1517         if (mp->m_flags & XFS_MOUNT_DAX) {
1518                 xfs_warn(mp,
1519         "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1520                 if (sb->s_blocksize != PAGE_SIZE) {
1521                         xfs_alert(mp,
1522                 "Filesystem block size invalid for DAX Turning DAX off.");
1523                         mp->m_flags &= ~XFS_MOUNT_DAX;
1524                 } else if (!sb->s_bdev->bd_disk->fops->direct_access) {
1525                         xfs_alert(mp,
1526                 "Block device does not support DAX Turning DAX off.");
1527                         mp->m_flags &= ~XFS_MOUNT_DAX;
1528                 }
1529         }
1530 
1531         error = xfs_mountfs(mp);
1532         if (error)
1533                 goto out_filestream_unmount;
1534 
1535         root = igrab(VFS_I(mp->m_rootip));
1536         if (!root) {
1537                 error = -ENOENT;
1538                 goto out_unmount;
1539         }
1540         sb->s_root = d_make_root(root);
1541         if (!sb->s_root) {
1542                 error = -ENOMEM;
1543                 goto out_unmount;
1544         }
1545 
1546         return 0;
1547 
1548  out_filestream_unmount:
1549         xfs_filestream_unmount(mp);
1550  out_free_sb:
1551         xfs_freesb(mp);
1552  out_destroy_counters:
1553         xfs_destroy_percpu_counters(mp);
1554 out_destroy_workqueues:
1555         xfs_destroy_mount_workqueues(mp);
1556  out_close_devices:
1557         xfs_close_devices(mp);
1558  out_free_fsname:
1559         xfs_free_fsname(mp);
1560         kfree(mp);
1561  out:
1562         return error;
1563 
1564  out_unmount:
1565         xfs_filestream_unmount(mp);
1566         xfs_unmountfs(mp);
1567         goto out_free_sb;
1568 }
1569 
1570 STATIC void
1571 xfs_fs_put_super(
1572         struct super_block      *sb)
1573 {
1574         struct xfs_mount        *mp = XFS_M(sb);
1575 
1576         xfs_notice(mp, "Unmounting Filesystem");
1577         xfs_filestream_unmount(mp);
1578         xfs_unmountfs(mp);
1579 
1580         xfs_freesb(mp);
1581         xfs_destroy_percpu_counters(mp);
1582         xfs_destroy_mount_workqueues(mp);
1583         xfs_close_devices(mp);
1584         xfs_free_fsname(mp);
1585         kfree(mp);
1586 }
1587 
1588 STATIC struct dentry *
1589 xfs_fs_mount(
1590         struct file_system_type *fs_type,
1591         int                     flags,
1592         const char              *dev_name,
1593         void                    *data)
1594 {
1595         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1596 }
1597 
1598 static long
1599 xfs_fs_nr_cached_objects(
1600         struct super_block      *sb,
1601         struct shrink_control   *sc)
1602 {
1603         return xfs_reclaim_inodes_count(XFS_M(sb));
1604 }
1605 
1606 static long
1607 xfs_fs_free_cached_objects(
1608         struct super_block      *sb,
1609         struct shrink_control   *sc)
1610 {
1611         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1612 }
1613 
1614 static const struct super_operations xfs_super_operations = {
1615         .alloc_inode            = xfs_fs_alloc_inode,
1616         .destroy_inode          = xfs_fs_destroy_inode,
1617         .evict_inode            = xfs_fs_evict_inode,
1618         .drop_inode             = xfs_fs_drop_inode,
1619         .put_super              = xfs_fs_put_super,
1620         .sync_fs                = xfs_fs_sync_fs,
1621         .freeze_fs              = xfs_fs_freeze,
1622         .unfreeze_fs            = xfs_fs_unfreeze,
1623         .statfs                 = xfs_fs_statfs,
1624         .remount_fs             = xfs_fs_remount,
1625         .show_options           = xfs_fs_show_options,
1626         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1627         .free_cached_objects    = xfs_fs_free_cached_objects,
1628 };
1629 
1630 static struct file_system_type xfs_fs_type = {
1631         .owner                  = THIS_MODULE,
1632         .name                   = "xfs",
1633         .mount                  = xfs_fs_mount,
1634         .kill_sb                = kill_block_super,
1635         .fs_flags               = FS_REQUIRES_DEV,
1636 };
1637 MODULE_ALIAS_FS("xfs");
1638 
1639 STATIC int __init
1640 xfs_init_zones(void)
1641 {
1642 
1643         xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
1644         if (!xfs_ioend_zone)
1645                 goto out;
1646 
1647         xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
1648                                                   xfs_ioend_zone);
1649         if (!xfs_ioend_pool)
1650                 goto out_destroy_ioend_zone;
1651 
1652         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1653                                                 "xfs_log_ticket");
1654         if (!xfs_log_ticket_zone)
1655                 goto out_destroy_ioend_pool;
1656 
1657         xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
1658                                                 "xfs_bmap_free_item");
1659         if (!xfs_bmap_free_item_zone)
1660                 goto out_destroy_log_ticket_zone;
1661 
1662         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1663                                                 "xfs_btree_cur");
1664         if (!xfs_btree_cur_zone)
1665                 goto out_destroy_bmap_free_item_zone;
1666 
1667         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1668                                                 "xfs_da_state");
1669         if (!xfs_da_state_zone)
1670                 goto out_destroy_btree_cur_zone;
1671 
1672         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1673         if (!xfs_ifork_zone)
1674                 goto out_destroy_da_state_zone;
1675 
1676         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1677         if (!xfs_trans_zone)
1678                 goto out_destroy_ifork_zone;
1679 
1680         xfs_log_item_desc_zone =
1681                 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1682                                "xfs_log_item_desc");
1683         if (!xfs_log_item_desc_zone)
1684                 goto out_destroy_trans_zone;
1685 
1686         /*
1687          * The size of the zone allocated buf log item is the maximum
1688          * size possible under XFS.  This wastes a little bit of memory,
1689          * but it is much faster.
1690          */
1691         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1692                                            "xfs_buf_item");
1693         if (!xfs_buf_item_zone)
1694                 goto out_destroy_log_item_desc_zone;
1695 
1696         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1697                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1698                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1699         if (!xfs_efd_zone)
1700                 goto out_destroy_buf_item_zone;
1701 
1702         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1703                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1704                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1705         if (!xfs_efi_zone)
1706                 goto out_destroy_efd_zone;
1707 
1708         xfs_inode_zone =
1709                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1710                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD,
1711                         xfs_fs_inode_init_once);
1712         if (!xfs_inode_zone)
1713                 goto out_destroy_efi_zone;
1714 
1715         xfs_ili_zone =
1716                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1717                                         KM_ZONE_SPREAD, NULL);
1718         if (!xfs_ili_zone)
1719                 goto out_destroy_inode_zone;
1720         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1721                                         "xfs_icr");
1722         if (!xfs_icreate_zone)
1723                 goto out_destroy_ili_zone;
1724 
1725         return 0;
1726 
1727  out_destroy_ili_zone:
1728         kmem_zone_destroy(xfs_ili_zone);
1729  out_destroy_inode_zone:
1730         kmem_zone_destroy(xfs_inode_zone);
1731  out_destroy_efi_zone:
1732         kmem_zone_destroy(xfs_efi_zone);
1733  out_destroy_efd_zone:
1734         kmem_zone_destroy(xfs_efd_zone);
1735  out_destroy_buf_item_zone:
1736         kmem_zone_destroy(xfs_buf_item_zone);
1737  out_destroy_log_item_desc_zone:
1738         kmem_zone_destroy(xfs_log_item_desc_zone);
1739  out_destroy_trans_zone:
1740         kmem_zone_destroy(xfs_trans_zone);
1741  out_destroy_ifork_zone:
1742         kmem_zone_destroy(xfs_ifork_zone);
1743  out_destroy_da_state_zone:
1744         kmem_zone_destroy(xfs_da_state_zone);
1745  out_destroy_btree_cur_zone:
1746         kmem_zone_destroy(xfs_btree_cur_zone);
1747  out_destroy_bmap_free_item_zone:
1748         kmem_zone_destroy(xfs_bmap_free_item_zone);
1749  out_destroy_log_ticket_zone:
1750         kmem_zone_destroy(xfs_log_ticket_zone);
1751  out_destroy_ioend_pool:
1752         mempool_destroy(xfs_ioend_pool);
1753  out_destroy_ioend_zone:
1754         kmem_zone_destroy(xfs_ioend_zone);
1755  out:
1756         return -ENOMEM;
1757 }
1758 
1759 STATIC void
1760 xfs_destroy_zones(void)
1761 {
1762         /*
1763          * Make sure all delayed rcu free are flushed before we
1764          * destroy caches.
1765          */
1766         rcu_barrier();
1767         kmem_zone_destroy(xfs_icreate_zone);
1768         kmem_zone_destroy(xfs_ili_zone);
1769         kmem_zone_destroy(xfs_inode_zone);
1770         kmem_zone_destroy(xfs_efi_zone);
1771         kmem_zone_destroy(xfs_efd_zone);
1772         kmem_zone_destroy(xfs_buf_item_zone);
1773         kmem_zone_destroy(xfs_log_item_desc_zone);
1774         kmem_zone_destroy(xfs_trans_zone);
1775         kmem_zone_destroy(xfs_ifork_zone);
1776         kmem_zone_destroy(xfs_da_state_zone);
1777         kmem_zone_destroy(xfs_btree_cur_zone);
1778         kmem_zone_destroy(xfs_bmap_free_item_zone);
1779         kmem_zone_destroy(xfs_log_ticket_zone);
1780         mempool_destroy(xfs_ioend_pool);
1781         kmem_zone_destroy(xfs_ioend_zone);
1782 
1783 }
1784 
1785 STATIC int __init
1786 xfs_init_workqueues(void)
1787 {
1788         /*
1789          * The allocation workqueue can be used in memory reclaim situations
1790          * (writepage path), and parallelism is only limited by the number of
1791          * AGs in all the filesystems mounted. Hence use the default large
1792          * max_active value for this workqueue.
1793          */
1794         xfs_alloc_wq = alloc_workqueue("xfsalloc",
1795                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
1796         if (!xfs_alloc_wq)
1797                 return -ENOMEM;
1798 
1799         return 0;
1800 }
1801 
1802 STATIC void
1803 xfs_destroy_workqueues(void)
1804 {
1805         destroy_workqueue(xfs_alloc_wq);
1806 }
1807 
1808 STATIC int __init
1809 init_xfs_fs(void)
1810 {
1811         int                     error;
1812 
1813         printk(KERN_INFO XFS_VERSION_STRING " with "
1814                          XFS_BUILD_OPTIONS " enabled\n");
1815 
1816         xfs_dir_startup();
1817 
1818         error = xfs_init_zones();
1819         if (error)
1820                 goto out;
1821 
1822         error = xfs_init_workqueues();
1823         if (error)
1824                 goto out_destroy_zones;
1825 
1826         error = xfs_mru_cache_init();
1827         if (error)
1828                 goto out_destroy_wq;
1829 
1830         error = xfs_buf_init();
1831         if (error)
1832                 goto out_mru_cache_uninit;
1833 
1834         error = xfs_init_procfs();
1835         if (error)
1836                 goto out_buf_terminate;
1837 
1838         error = xfs_sysctl_register();
1839         if (error)
1840                 goto out_cleanup_procfs;
1841 
1842         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
1843         if (!xfs_kset) {
1844                 error = -ENOMEM;
1845                 goto out_sysctl_unregister;;
1846         }
1847 
1848 #ifdef DEBUG
1849         xfs_dbg_kobj.kobject.kset = xfs_kset;
1850         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
1851         if (error)
1852                 goto out_kset_unregister;
1853 #endif
1854 
1855         error = xfs_qm_init();
1856         if (error)
1857                 goto out_remove_kobj;
1858 
1859         error = register_filesystem(&xfs_fs_type);
1860         if (error)
1861                 goto out_qm_exit;
1862         return 0;
1863 
1864  out_qm_exit:
1865         xfs_qm_exit();
1866  out_remove_kobj:
1867 #ifdef DEBUG
1868         xfs_sysfs_del(&xfs_dbg_kobj);
1869  out_kset_unregister:
1870 #endif
1871         kset_unregister(xfs_kset);
1872  out_sysctl_unregister:
1873         xfs_sysctl_unregister();
1874  out_cleanup_procfs:
1875         xfs_cleanup_procfs();
1876  out_buf_terminate:
1877         xfs_buf_terminate();
1878  out_mru_cache_uninit:
1879         xfs_mru_cache_uninit();
1880  out_destroy_wq:
1881         xfs_destroy_workqueues();
1882  out_destroy_zones:
1883         xfs_destroy_zones();
1884  out:
1885         return error;
1886 }
1887 
1888 STATIC void __exit
1889 exit_xfs_fs(void)
1890 {
1891         xfs_qm_exit();
1892         unregister_filesystem(&xfs_fs_type);
1893 #ifdef DEBUG
1894         xfs_sysfs_del(&xfs_dbg_kobj);
1895 #endif
1896         kset_unregister(xfs_kset);
1897         xfs_sysctl_unregister();
1898         xfs_cleanup_procfs();
1899         xfs_buf_terminate();
1900         xfs_mru_cache_uninit();
1901         xfs_destroy_workqueues();
1902         xfs_destroy_zones();
1903 }
1904 
1905 module_init(init_xfs_fs);
1906 module_exit(exit_xfs_fs);
1907 
1908 MODULE_AUTHOR("Silicon Graphics, Inc.");
1909 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
1910 MODULE_LICENSE("GPL");
1911 

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