Version:  2.0.40 2.2.26 2.4.37 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 4.3 4.4

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_ALLOCSIZE) ||
265                            !strcmp(this_char, MNTOPT_BIOSIZE)) {
266                         if (!value || !*value) {
267                                 xfs_warn(mp, "%s option requires an argument",
268                                         this_char);
269                                 return -EINVAL;
270                         }
271                         if (suffix_kstrtoint(value, 10, &iosize))
272                                 return -EINVAL;
273                         iosizelog = ffs(iosize) - 1;
274                 } else if (!strcmp(this_char, MNTOPT_GRPID) ||
275                            !strcmp(this_char, MNTOPT_BSDGROUPS)) {
276                         mp->m_flags |= XFS_MOUNT_GRPID;
277                 } else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
278                            !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
279                         mp->m_flags &= ~XFS_MOUNT_GRPID;
280                 } else if (!strcmp(this_char, MNTOPT_WSYNC)) {
281                         mp->m_flags |= XFS_MOUNT_WSYNC;
282                 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
283                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
284                 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
285                         mp->m_flags |= XFS_MOUNT_NOALIGN;
286                 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
287                         mp->m_flags |= XFS_MOUNT_SWALLOC;
288                 } else if (!strcmp(this_char, MNTOPT_SUNIT)) {
289                         if (!value || !*value) {
290                                 xfs_warn(mp, "%s option requires an argument",
291                                         this_char);
292                                 return -EINVAL;
293                         }
294                         if (kstrtoint(value, 10, &dsunit))
295                                 return -EINVAL;
296                 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
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, &dswidth))
303                                 return -EINVAL;
304                 } else if (!strcmp(this_char, MNTOPT_32BITINODE)) {
305                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
306                 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
307                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
308                 } else if (!strcmp(this_char, MNTOPT_NOUUID)) {
309                         mp->m_flags |= XFS_MOUNT_NOUUID;
310                 } else if (!strcmp(this_char, MNTOPT_BARRIER)) {
311                         mp->m_flags |= XFS_MOUNT_BARRIER;
312                 } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
313                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
314                 } else if (!strcmp(this_char, MNTOPT_IKEEP)) {
315                         mp->m_flags |= XFS_MOUNT_IKEEP;
316                 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
317                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
318                 } else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
319                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
320                 } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
321                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
322                 } else if (!strcmp(this_char, MNTOPT_ATTR2)) {
323                         mp->m_flags |= XFS_MOUNT_ATTR2;
324                 } else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
325                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
326                         mp->m_flags |= XFS_MOUNT_NOATTR2;
327                 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
328                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
329                 } else if (!strcmp(this_char, MNTOPT_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                 } else if (!strcmp(this_char, MNTOPT_QUOTA) ||
334                            !strcmp(this_char, MNTOPT_UQUOTA) ||
335                            !strcmp(this_char, MNTOPT_USRQUOTA)) {
336                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
337                                          XFS_UQUOTA_ENFD);
338                 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
339                            !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
340                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
341                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
342                 } else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
343                            !strcmp(this_char, MNTOPT_PRJQUOTA)) {
344                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
345                                          XFS_PQUOTA_ENFD);
346                 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
347                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
348                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
349                 } else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
350                            !strcmp(this_char, MNTOPT_GRPQUOTA)) {
351                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
352                                          XFS_GQUOTA_ENFD);
353                 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
354                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
355                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
356                 } else if (!strcmp(this_char, MNTOPT_DISCARD)) {
357                         mp->m_flags |= XFS_MOUNT_DISCARD;
358                 } else if (!strcmp(this_char, MNTOPT_NODISCARD)) {
359                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
360 #ifdef CONFIG_FS_DAX
361                 } else if (!strcmp(this_char, MNTOPT_DAX)) {
362                         mp->m_flags |= XFS_MOUNT_DAX;
363 #endif
364                 } else {
365                         xfs_warn(mp, "unknown mount option [%s].", this_char);
366                         return -EINVAL;
367                 }
368         }
369 
370         /*
371          * no recovery flag requires a read-only mount
372          */
373         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
374             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
375                 xfs_warn(mp, "no-recovery mounts must be read-only.");
376                 return -EINVAL;
377         }
378 
379         if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
380                 xfs_warn(mp,
381         "sunit and swidth options incompatible with the noalign option");
382                 return -EINVAL;
383         }
384 
385 #ifndef CONFIG_XFS_QUOTA
386         if (XFS_IS_QUOTA_RUNNING(mp)) {
387                 xfs_warn(mp, "quota support not available in this kernel.");
388                 return -EINVAL;
389         }
390 #endif
391 
392         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
393                 xfs_warn(mp, "sunit and swidth must be specified together");
394                 return -EINVAL;
395         }
396 
397         if (dsunit && (dswidth % dsunit != 0)) {
398                 xfs_warn(mp,
399         "stripe width (%d) must be a multiple of the stripe unit (%d)",
400                         dswidth, dsunit);
401                 return -EINVAL;
402         }
403 
404 done:
405         if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
406                 /*
407                  * At this point the superblock has not been read
408                  * in, therefore we do not know the block size.
409                  * Before the mount call ends we will convert
410                  * these to FSBs.
411                  */
412                 mp->m_dalign = dsunit;
413                 mp->m_swidth = dswidth;
414         }
415 
416         if (mp->m_logbufs != -1 &&
417             mp->m_logbufs != 0 &&
418             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
419              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
420                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
421                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
422                 return -EINVAL;
423         }
424         if (mp->m_logbsize != -1 &&
425             mp->m_logbsize !=  0 &&
426             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
427              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
428              !is_power_of_2(mp->m_logbsize))) {
429                 xfs_warn(mp,
430                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
431                         mp->m_logbsize);
432                 return -EINVAL;
433         }
434 
435         if (iosizelog) {
436                 if (iosizelog > XFS_MAX_IO_LOG ||
437                     iosizelog < XFS_MIN_IO_LOG) {
438                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
439                                 iosizelog, XFS_MIN_IO_LOG,
440                                 XFS_MAX_IO_LOG);
441                         return -EINVAL;
442                 }
443 
444                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
445                 mp->m_readio_log = iosizelog;
446                 mp->m_writeio_log = iosizelog;
447         }
448 
449         return 0;
450 }
451 
452 struct proc_xfs_info {
453         uint64_t        flag;
454         char            *str;
455 };
456 
457 STATIC int
458 xfs_showargs(
459         struct xfs_mount        *mp,
460         struct seq_file         *m)
461 {
462         static struct proc_xfs_info xfs_info_set[] = {
463                 /* the few simple ones we can get from the mount struct */
464                 { XFS_MOUNT_IKEEP,              "," MNTOPT_IKEEP },
465                 { XFS_MOUNT_WSYNC,              "," MNTOPT_WSYNC },
466                 { XFS_MOUNT_NOALIGN,            "," MNTOPT_NOALIGN },
467                 { XFS_MOUNT_SWALLOC,            "," MNTOPT_SWALLOC },
468                 { XFS_MOUNT_NOUUID,             "," MNTOPT_NOUUID },
469                 { XFS_MOUNT_NORECOVERY,         "," MNTOPT_NORECOVERY },
470                 { XFS_MOUNT_ATTR2,              "," MNTOPT_ATTR2 },
471                 { XFS_MOUNT_FILESTREAMS,        "," MNTOPT_FILESTREAM },
472                 { XFS_MOUNT_GRPID,              "," MNTOPT_GRPID },
473                 { XFS_MOUNT_DISCARD,            "," MNTOPT_DISCARD },
474                 { XFS_MOUNT_SMALL_INUMS,        "," MNTOPT_32BITINODE },
475                 { XFS_MOUNT_DAX,                "," MNTOPT_DAX },
476                 { 0, NULL }
477         };
478         static struct proc_xfs_info xfs_info_unset[] = {
479                 /* the few simple ones we can get from the mount struct */
480                 { XFS_MOUNT_COMPAT_IOSIZE,      "," MNTOPT_LARGEIO },
481                 { XFS_MOUNT_BARRIER,            "," MNTOPT_NOBARRIER },
482                 { XFS_MOUNT_SMALL_INUMS,        "," MNTOPT_64BITINODE },
483                 { 0, NULL }
484         };
485         struct proc_xfs_info    *xfs_infop;
486 
487         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
488                 if (mp->m_flags & xfs_infop->flag)
489                         seq_puts(m, xfs_infop->str);
490         }
491         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
492                 if (!(mp->m_flags & xfs_infop->flag))
493                         seq_puts(m, xfs_infop->str);
494         }
495 
496         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
497                 seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk",
498                                 (int)(1 << mp->m_writeio_log) >> 10);
499 
500         if (mp->m_logbufs > 0)
501                 seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
502         if (mp->m_logbsize > 0)
503                 seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10);
504 
505         if (mp->m_logname)
506                 seq_show_option(m, MNTOPT_LOGDEV, mp->m_logname);
507         if (mp->m_rtname)
508                 seq_show_option(m, MNTOPT_RTDEV, mp->m_rtname);
509 
510         if (mp->m_dalign > 0)
511                 seq_printf(m, "," MNTOPT_SUNIT "=%d",
512                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
513         if (mp->m_swidth > 0)
514                 seq_printf(m, "," MNTOPT_SWIDTH "=%d",
515                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
516 
517         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
518                 seq_puts(m, "," MNTOPT_USRQUOTA);
519         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
520                 seq_puts(m, "," MNTOPT_UQUOTANOENF);
521 
522         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
523                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
524                         seq_puts(m, "," MNTOPT_PRJQUOTA);
525                 else
526                         seq_puts(m, "," MNTOPT_PQUOTANOENF);
527         }
528         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
529                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
530                         seq_puts(m, "," MNTOPT_GRPQUOTA);
531                 else
532                         seq_puts(m, "," MNTOPT_GQUOTANOENF);
533         }
534 
535         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
536                 seq_puts(m, "," MNTOPT_NOQUOTA);
537 
538         return 0;
539 }
540 __uint64_t
541 xfs_max_file_offset(
542         unsigned int            blockshift)
543 {
544         unsigned int            pagefactor = 1;
545         unsigned int            bitshift = BITS_PER_LONG - 1;
546 
547         /* Figure out maximum filesize, on Linux this can depend on
548          * the filesystem blocksize (on 32 bit platforms).
549          * __block_write_begin does this in an [unsigned] long...
550          *      page->index << (PAGE_CACHE_SHIFT - bbits)
551          * So, for page sized blocks (4K on 32 bit platforms),
552          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
553          *      (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
554          * but for smaller blocksizes it is less (bbits = log2 bsize).
555          * Note1: get_block_t takes a long (implicit cast from above)
556          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
557          * can optionally convert the [unsigned] long from above into
558          * an [unsigned] long long.
559          */
560 
561 #if BITS_PER_LONG == 32
562 # if defined(CONFIG_LBDAF)
563         ASSERT(sizeof(sector_t) == 8);
564         pagefactor = PAGE_CACHE_SIZE;
565         bitshift = BITS_PER_LONG;
566 # else
567         pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
568 # endif
569 #endif
570 
571         return (((__uint64_t)pagefactor) << bitshift) - 1;
572 }
573 
574 /*
575  * xfs_set_inode32() and xfs_set_inode64() are passed an agcount
576  * because in the growfs case, mp->m_sb.sb_agcount is not updated
577  * yet to the potentially higher ag count.
578  */
579 xfs_agnumber_t
580 xfs_set_inode32(struct xfs_mount *mp, xfs_agnumber_t agcount)
581 {
582         xfs_agnumber_t  index = 0;
583         xfs_agnumber_t  maxagi = 0;
584         xfs_sb_t        *sbp = &mp->m_sb;
585         xfs_agnumber_t  max_metadata;
586         xfs_agino_t     agino;
587         xfs_ino_t       ino;
588         xfs_perag_t     *pag;
589 
590         /* Calculate how much should be reserved for inodes to meet
591          * the max inode percentage.
592          */
593         if (mp->m_maxicount) {
594                 __uint64_t      icount;
595 
596                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
597                 do_div(icount, 100);
598                 icount += sbp->sb_agblocks - 1;
599                 do_div(icount, sbp->sb_agblocks);
600                 max_metadata = icount;
601         } else {
602                 max_metadata = agcount;
603         }
604 
605         agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
606 
607         for (index = 0; index < agcount; index++) {
608                 ino = XFS_AGINO_TO_INO(mp, index, agino);
609 
610                 if (ino > XFS_MAXINUMBER_32) {
611                         pag = xfs_perag_get(mp, index);
612                         pag->pagi_inodeok = 0;
613                         pag->pagf_metadata = 0;
614                         xfs_perag_put(pag);
615                         continue;
616                 }
617 
618                 pag = xfs_perag_get(mp, index);
619                 pag->pagi_inodeok = 1;
620                 maxagi++;
621                 if (index < max_metadata)
622                         pag->pagf_metadata = 1;
623                 xfs_perag_put(pag);
624         }
625         mp->m_flags |= (XFS_MOUNT_32BITINODES |
626                         XFS_MOUNT_SMALL_INUMS);
627 
628         return maxagi;
629 }
630 
631 xfs_agnumber_t
632 xfs_set_inode64(struct xfs_mount *mp, xfs_agnumber_t agcount)
633 {
634         xfs_agnumber_t index = 0;
635 
636         for (index = 0; index < agcount; index++) {
637                 struct xfs_perag        *pag;
638 
639                 pag = xfs_perag_get(mp, index);
640                 pag->pagi_inodeok = 1;
641                 pag->pagf_metadata = 0;
642                 xfs_perag_put(pag);
643         }
644 
645         /* There is no need for lock protection on m_flags,
646          * the rw_semaphore of the VFS superblock is locked
647          * during mount/umount/remount operations, so this is
648          * enough to avoid concurency on the m_flags field
649          */
650         mp->m_flags &= ~(XFS_MOUNT_32BITINODES |
651                          XFS_MOUNT_SMALL_INUMS);
652         return index;
653 }
654 
655 STATIC int
656 xfs_blkdev_get(
657         xfs_mount_t             *mp,
658         const char              *name,
659         struct block_device     **bdevp)
660 {
661         int                     error = 0;
662 
663         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
664                                     mp);
665         if (IS_ERR(*bdevp)) {
666                 error = PTR_ERR(*bdevp);
667                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
668         }
669 
670         return error;
671 }
672 
673 STATIC void
674 xfs_blkdev_put(
675         struct block_device     *bdev)
676 {
677         if (bdev)
678                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
679 }
680 
681 void
682 xfs_blkdev_issue_flush(
683         xfs_buftarg_t           *buftarg)
684 {
685         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
686 }
687 
688 STATIC void
689 xfs_close_devices(
690         struct xfs_mount        *mp)
691 {
692         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
693                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
694                 xfs_free_buftarg(mp, mp->m_logdev_targp);
695                 xfs_blkdev_put(logdev);
696         }
697         if (mp->m_rtdev_targp) {
698                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
699                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
700                 xfs_blkdev_put(rtdev);
701         }
702         xfs_free_buftarg(mp, mp->m_ddev_targp);
703 }
704 
705 /*
706  * The file system configurations are:
707  *      (1) device (partition) with data and internal log
708  *      (2) logical volume with data and log subvolumes.
709  *      (3) logical volume with data, log, and realtime subvolumes.
710  *
711  * We only have to handle opening the log and realtime volumes here if
712  * they are present.  The data subvolume has already been opened by
713  * get_sb_bdev() and is stored in sb->s_bdev.
714  */
715 STATIC int
716 xfs_open_devices(
717         struct xfs_mount        *mp)
718 {
719         struct block_device     *ddev = mp->m_super->s_bdev;
720         struct block_device     *logdev = NULL, *rtdev = NULL;
721         int                     error;
722 
723         /*
724          * Open real time and log devices - order is important.
725          */
726         if (mp->m_logname) {
727                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
728                 if (error)
729                         goto out;
730         }
731 
732         if (mp->m_rtname) {
733                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
734                 if (error)
735                         goto out_close_logdev;
736 
737                 if (rtdev == ddev || rtdev == logdev) {
738                         xfs_warn(mp,
739         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
740                         error = -EINVAL;
741                         goto out_close_rtdev;
742                 }
743         }
744 
745         /*
746          * Setup xfs_mount buffer target pointers
747          */
748         error = -ENOMEM;
749         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev);
750         if (!mp->m_ddev_targp)
751                 goto out_close_rtdev;
752 
753         if (rtdev) {
754                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev);
755                 if (!mp->m_rtdev_targp)
756                         goto out_free_ddev_targ;
757         }
758 
759         if (logdev && logdev != ddev) {
760                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
761                 if (!mp->m_logdev_targp)
762                         goto out_free_rtdev_targ;
763         } else {
764                 mp->m_logdev_targp = mp->m_ddev_targp;
765         }
766 
767         return 0;
768 
769  out_free_rtdev_targ:
770         if (mp->m_rtdev_targp)
771                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
772  out_free_ddev_targ:
773         xfs_free_buftarg(mp, mp->m_ddev_targp);
774  out_close_rtdev:
775         xfs_blkdev_put(rtdev);
776  out_close_logdev:
777         if (logdev && logdev != ddev)
778                 xfs_blkdev_put(logdev);
779  out:
780         return error;
781 }
782 
783 /*
784  * Setup xfs_mount buffer target pointers based on superblock
785  */
786 STATIC int
787 xfs_setup_devices(
788         struct xfs_mount        *mp)
789 {
790         int                     error;
791 
792         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
793         if (error)
794                 return error;
795 
796         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
797                 unsigned int    log_sector_size = BBSIZE;
798 
799                 if (xfs_sb_version_hassector(&mp->m_sb))
800                         log_sector_size = mp->m_sb.sb_logsectsize;
801                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
802                                             log_sector_size);
803                 if (error)
804                         return error;
805         }
806         if (mp->m_rtdev_targp) {
807                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
808                                             mp->m_sb.sb_sectsize);
809                 if (error)
810                         return error;
811         }
812 
813         return 0;
814 }
815 
816 STATIC int
817 xfs_init_mount_workqueues(
818         struct xfs_mount        *mp)
819 {
820         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
821                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
822         if (!mp->m_buf_workqueue)
823                 goto out;
824 
825         mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
826                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
827         if (!mp->m_data_workqueue)
828                 goto out_destroy_buf;
829 
830         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
831                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
832         if (!mp->m_unwritten_workqueue)
833                 goto out_destroy_data_iodone_queue;
834 
835         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
836                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
837         if (!mp->m_cil_workqueue)
838                 goto out_destroy_unwritten;
839 
840         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
841                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
842         if (!mp->m_reclaim_workqueue)
843                 goto out_destroy_cil;
844 
845         mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
846                         WQ_MEM_RECLAIM|WQ_FREEZABLE|WQ_HIGHPRI, 0,
847                         mp->m_fsname);
848         if (!mp->m_log_workqueue)
849                 goto out_destroy_reclaim;
850 
851         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
852                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
853         if (!mp->m_eofblocks_workqueue)
854                 goto out_destroy_log;
855 
856         return 0;
857 
858 out_destroy_log:
859         destroy_workqueue(mp->m_log_workqueue);
860 out_destroy_reclaim:
861         destroy_workqueue(mp->m_reclaim_workqueue);
862 out_destroy_cil:
863         destroy_workqueue(mp->m_cil_workqueue);
864 out_destroy_unwritten:
865         destroy_workqueue(mp->m_unwritten_workqueue);
866 out_destroy_data_iodone_queue:
867         destroy_workqueue(mp->m_data_workqueue);
868 out_destroy_buf:
869         destroy_workqueue(mp->m_buf_workqueue);
870 out:
871         return -ENOMEM;
872 }
873 
874 STATIC void
875 xfs_destroy_mount_workqueues(
876         struct xfs_mount        *mp)
877 {
878         destroy_workqueue(mp->m_eofblocks_workqueue);
879         destroy_workqueue(mp->m_log_workqueue);
880         destroy_workqueue(mp->m_reclaim_workqueue);
881         destroy_workqueue(mp->m_cil_workqueue);
882         destroy_workqueue(mp->m_data_workqueue);
883         destroy_workqueue(mp->m_unwritten_workqueue);
884         destroy_workqueue(mp->m_buf_workqueue);
885 }
886 
887 /*
888  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
889  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
890  * for IO to complete so that we effectively throttle multiple callers to the
891  * rate at which IO is completing.
892  */
893 void
894 xfs_flush_inodes(
895         struct xfs_mount        *mp)
896 {
897         struct super_block      *sb = mp->m_super;
898 
899         if (down_read_trylock(&sb->s_umount)) {
900                 sync_inodes_sb(sb);
901                 up_read(&sb->s_umount);
902         }
903 }
904 
905 /* Catch misguided souls that try to use this interface on XFS */
906 STATIC struct inode *
907 xfs_fs_alloc_inode(
908         struct super_block      *sb)
909 {
910         BUG();
911         return NULL;
912 }
913 
914 /*
915  * Now that the generic code is guaranteed not to be accessing
916  * the linux inode, we can reclaim the inode.
917  */
918 STATIC void
919 xfs_fs_destroy_inode(
920         struct inode            *inode)
921 {
922         struct xfs_inode        *ip = XFS_I(inode);
923 
924         trace_xfs_destroy_inode(ip);
925 
926         XFS_STATS_INC(ip->i_mount, vn_reclaim);
927 
928         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
929 
930         /*
931          * We should never get here with one of the reclaim flags already set.
932          */
933         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
934         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
935 
936         /*
937          * We always use background reclaim here because even if the
938          * inode is clean, it still may be under IO and hence we have
939          * to take the flush lock. The background reclaim path handles
940          * this more efficiently than we can here, so simply let background
941          * reclaim tear down all inodes.
942          */
943         xfs_inode_set_reclaim_tag(ip);
944 }
945 
946 /*
947  * Slab object creation initialisation for the XFS inode.
948  * This covers only the idempotent fields in the XFS inode;
949  * all other fields need to be initialised on allocation
950  * from the slab. This avoids the need to repeatedly initialise
951  * fields in the xfs inode that left in the initialise state
952  * when freeing the inode.
953  */
954 STATIC void
955 xfs_fs_inode_init_once(
956         void                    *inode)
957 {
958         struct xfs_inode        *ip = inode;
959 
960         memset(ip, 0, sizeof(struct xfs_inode));
961 
962         /* vfs inode */
963         inode_init_once(VFS_I(ip));
964 
965         /* xfs inode */
966         atomic_set(&ip->i_pincount, 0);
967         spin_lock_init(&ip->i_flags_lock);
968 
969         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
970                      "xfsino", ip->i_ino);
971         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
972                      "xfsino", ip->i_ino);
973 }
974 
975 STATIC void
976 xfs_fs_evict_inode(
977         struct inode            *inode)
978 {
979         xfs_inode_t             *ip = XFS_I(inode);
980 
981         ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
982 
983         trace_xfs_evict_inode(ip);
984 
985         truncate_inode_pages_final(&inode->i_data);
986         clear_inode(inode);
987         XFS_STATS_INC(ip->i_mount, vn_rele);
988         XFS_STATS_INC(ip->i_mount, vn_remove);
989 
990         xfs_inactive(ip);
991 }
992 
993 /*
994  * We do an unlocked check for XFS_IDONTCACHE here because we are already
995  * serialised against cache hits here via the inode->i_lock and igrab() in
996  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
997  * racing with us, and it avoids needing to grab a spinlock here for every inode
998  * we drop the final reference on.
999  */
1000 STATIC int
1001 xfs_fs_drop_inode(
1002         struct inode            *inode)
1003 {
1004         struct xfs_inode        *ip = XFS_I(inode);
1005 
1006         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1007 }
1008 
1009 STATIC void
1010 xfs_free_fsname(
1011         struct xfs_mount        *mp)
1012 {
1013         kfree(mp->m_fsname);
1014         kfree(mp->m_rtname);
1015         kfree(mp->m_logname);
1016 }
1017 
1018 STATIC int
1019 xfs_fs_sync_fs(
1020         struct super_block      *sb,
1021         int                     wait)
1022 {
1023         struct xfs_mount        *mp = XFS_M(sb);
1024 
1025         /*
1026          * Doing anything during the async pass would be counterproductive.
1027          */
1028         if (!wait)
1029                 return 0;
1030 
1031         xfs_log_force(mp, XFS_LOG_SYNC);
1032         if (laptop_mode) {
1033                 /*
1034                  * The disk must be active because we're syncing.
1035                  * We schedule log work now (now that the disk is
1036                  * active) instead of later (when it might not be).
1037                  */
1038                 flush_delayed_work(&mp->m_log->l_work);
1039         }
1040 
1041         return 0;
1042 }
1043 
1044 STATIC int
1045 xfs_fs_statfs(
1046         struct dentry           *dentry,
1047         struct kstatfs          *statp)
1048 {
1049         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1050         xfs_sb_t                *sbp = &mp->m_sb;
1051         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
1052         __uint64_t              fakeinos, id;
1053         __uint64_t              icount;
1054         __uint64_t              ifree;
1055         __uint64_t              fdblocks;
1056         xfs_extlen_t            lsize;
1057         __int64_t               ffree;
1058 
1059         statp->f_type = XFS_SB_MAGIC;
1060         statp->f_namelen = MAXNAMELEN - 1;
1061 
1062         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1063         statp->f_fsid.val[0] = (u32)id;
1064         statp->f_fsid.val[1] = (u32)(id >> 32);
1065 
1066         icount = percpu_counter_sum(&mp->m_icount);
1067         ifree = percpu_counter_sum(&mp->m_ifree);
1068         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1069 
1070         spin_lock(&mp->m_sb_lock);
1071         statp->f_bsize = sbp->sb_blocksize;
1072         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1073         statp->f_blocks = sbp->sb_dblocks - lsize;
1074         spin_unlock(&mp->m_sb_lock);
1075 
1076         statp->f_bfree = fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1077         statp->f_bavail = statp->f_bfree;
1078 
1079         fakeinos = statp->f_bfree << sbp->sb_inopblog;
1080         statp->f_files = MIN(icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1081         if (mp->m_maxicount)
1082                 statp->f_files = min_t(typeof(statp->f_files),
1083                                         statp->f_files,
1084                                         mp->m_maxicount);
1085 
1086         /* If sb_icount overshot maxicount, report actual allocation */
1087         statp->f_files = max_t(typeof(statp->f_files),
1088                                         statp->f_files,
1089                                         sbp->sb_icount);
1090 
1091         /* make sure statp->f_ffree does not underflow */
1092         ffree = statp->f_files - (icount - ifree);
1093         statp->f_ffree = max_t(__int64_t, ffree, 0);
1094 
1095 
1096         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1097             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1098                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1099                 xfs_qm_statvfs(ip, statp);
1100         return 0;
1101 }
1102 
1103 STATIC void
1104 xfs_save_resvblks(struct xfs_mount *mp)
1105 {
1106         __uint64_t resblks = 0;
1107 
1108         mp->m_resblks_save = mp->m_resblks;
1109         xfs_reserve_blocks(mp, &resblks, NULL);
1110 }
1111 
1112 STATIC void
1113 xfs_restore_resvblks(struct xfs_mount *mp)
1114 {
1115         __uint64_t resblks;
1116 
1117         if (mp->m_resblks_save) {
1118                 resblks = mp->m_resblks_save;
1119                 mp->m_resblks_save = 0;
1120         } else
1121                 resblks = xfs_default_resblks(mp);
1122 
1123         xfs_reserve_blocks(mp, &resblks, NULL);
1124 }
1125 
1126 /*
1127  * Trigger writeback of all the dirty metadata in the file system.
1128  *
1129  * This ensures that the metadata is written to their location on disk rather
1130  * than just existing in transactions in the log. This means after a quiesce
1131  * there is no log replay required to write the inodes to disk - this is the
1132  * primary difference between a sync and a quiesce.
1133  *
1134  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1135  * it is started again when appropriate.
1136  */
1137 static void
1138 xfs_quiesce_attr(
1139         struct xfs_mount        *mp)
1140 {
1141         int     error = 0;
1142 
1143         /* wait for all modifications to complete */
1144         while (atomic_read(&mp->m_active_trans) > 0)
1145                 delay(100);
1146 
1147         /* force the log to unpin objects from the now complete transactions */
1148         xfs_log_force(mp, XFS_LOG_SYNC);
1149 
1150         /* reclaim inodes to do any IO before the freeze completes */
1151         xfs_reclaim_inodes(mp, 0);
1152         xfs_reclaim_inodes(mp, SYNC_WAIT);
1153 
1154         /* Push the superblock and write an unmount record */
1155         error = xfs_log_sbcount(mp);
1156         if (error)
1157                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1158                                 "Frozen image may not be consistent.");
1159         /*
1160          * Just warn here till VFS can correctly support
1161          * read-only remount without racing.
1162          */
1163         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1164 
1165         xfs_log_quiesce(mp);
1166 }
1167 
1168 STATIC int
1169 xfs_fs_remount(
1170         struct super_block      *sb,
1171         int                     *flags,
1172         char                    *options)
1173 {
1174         struct xfs_mount        *mp = XFS_M(sb);
1175         xfs_sb_t                *sbp = &mp->m_sb;
1176         substring_t             args[MAX_OPT_ARGS];
1177         char                    *p;
1178         int                     error;
1179 
1180         sync_filesystem(sb);
1181         while ((p = strsep(&options, ",")) != NULL) {
1182                 int token;
1183 
1184                 if (!*p)
1185                         continue;
1186 
1187                 token = match_token(p, tokens, args);
1188                 switch (token) {
1189                 case Opt_barrier:
1190                         mp->m_flags |= XFS_MOUNT_BARRIER;
1191                         break;
1192                 case Opt_nobarrier:
1193                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
1194                         break;
1195                 case Opt_inode64:
1196                         mp->m_maxagi = xfs_set_inode64(mp, sbp->sb_agcount);
1197                         break;
1198                 case Opt_inode32:
1199                         mp->m_maxagi = xfs_set_inode32(mp, sbp->sb_agcount);
1200                         break;
1201                 default:
1202                         /*
1203                          * Logically we would return an error here to prevent
1204                          * users from believing they might have changed
1205                          * mount options using remount which can't be changed.
1206                          *
1207                          * But unfortunately mount(8) adds all options from
1208                          * mtab and fstab to the mount arguments in some cases
1209                          * so we can't blindly reject options, but have to
1210                          * check for each specified option if it actually
1211                          * differs from the currently set option and only
1212                          * reject it if that's the case.
1213                          *
1214                          * Until that is implemented we return success for
1215                          * every remount request, and silently ignore all
1216                          * options that we can't actually change.
1217                          */
1218 #if 0
1219                         xfs_info(mp,
1220                 "mount option \"%s\" not supported for remount", p);
1221                         return -EINVAL;
1222 #else
1223                         break;
1224 #endif
1225                 }
1226         }
1227 
1228         /* ro -> rw */
1229         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1230                 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1231                         xfs_warn(mp,
1232                 "ro->rw transition prohibited on norecovery mount");
1233                         return -EINVAL;
1234                 }
1235 
1236                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1237 
1238                 /*
1239                  * If this is the first remount to writeable state we
1240                  * might have some superblock changes to update.
1241                  */
1242                 if (mp->m_update_sb) {
1243                         error = xfs_sync_sb(mp, false);
1244                         if (error) {
1245                                 xfs_warn(mp, "failed to write sb changes");
1246                                 return error;
1247                         }
1248                         mp->m_update_sb = false;
1249                 }
1250 
1251                 /*
1252                  * Fill out the reserve pool if it is empty. Use the stashed
1253                  * value if it is non-zero, otherwise go with the default.
1254                  */
1255                 xfs_restore_resvblks(mp);
1256                 xfs_log_work_queue(mp);
1257         }
1258 
1259         /* rw -> ro */
1260         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1261                 /*
1262                  * Before we sync the metadata, we need to free up the reserve
1263                  * block pool so that the used block count in the superblock on
1264                  * disk is correct at the end of the remount. Stash the current
1265                  * reserve pool size so that if we get remounted rw, we can
1266                  * return it to the same size.
1267                  */
1268                 xfs_save_resvblks(mp);
1269                 xfs_quiesce_attr(mp);
1270                 mp->m_flags |= XFS_MOUNT_RDONLY;
1271         }
1272 
1273         return 0;
1274 }
1275 
1276 /*
1277  * Second stage of a freeze. The data is already frozen so we only
1278  * need to take care of the metadata. Once that's done sync the superblock
1279  * to the log to dirty it in case of a crash while frozen. This ensures that we
1280  * will recover the unlinked inode lists on the next mount.
1281  */
1282 STATIC int
1283 xfs_fs_freeze(
1284         struct super_block      *sb)
1285 {
1286         struct xfs_mount        *mp = XFS_M(sb);
1287 
1288         xfs_save_resvblks(mp);
1289         xfs_quiesce_attr(mp);
1290         return xfs_sync_sb(mp, true);
1291 }
1292 
1293 STATIC int
1294 xfs_fs_unfreeze(
1295         struct super_block      *sb)
1296 {
1297         struct xfs_mount        *mp = XFS_M(sb);
1298 
1299         xfs_restore_resvblks(mp);
1300         xfs_log_work_queue(mp);
1301         return 0;
1302 }
1303 
1304 STATIC int
1305 xfs_fs_show_options(
1306         struct seq_file         *m,
1307         struct dentry           *root)
1308 {
1309         return xfs_showargs(XFS_M(root->d_sb), m);
1310 }
1311 
1312 /*
1313  * This function fills in xfs_mount_t fields based on mount args.
1314  * Note: the superblock _has_ now been read in.
1315  */
1316 STATIC int
1317 xfs_finish_flags(
1318         struct xfs_mount        *mp)
1319 {
1320         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1321 
1322         /* Fail a mount where the logbuf is smaller than the log stripe */
1323         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1324                 if (mp->m_logbsize <= 0 &&
1325                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1326                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1327                 } else if (mp->m_logbsize > 0 &&
1328                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1329                         xfs_warn(mp,
1330                 "logbuf size must be greater than or equal to log stripe size");
1331                         return -EINVAL;
1332                 }
1333         } else {
1334                 /* Fail a mount if the logbuf is larger than 32K */
1335                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1336                         xfs_warn(mp,
1337                 "logbuf size for version 1 logs must be 16K or 32K");
1338                         return -EINVAL;
1339                 }
1340         }
1341 
1342         /*
1343          * V5 filesystems always use attr2 format for attributes.
1344          */
1345         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1346             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1347                 xfs_warn(mp,
1348 "Cannot mount a V5 filesystem as %s. %s is always enabled for V5 filesystems.",
1349                         MNTOPT_NOATTR2, MNTOPT_ATTR2);
1350                 return -EINVAL;
1351         }
1352 
1353         /*
1354          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1355          * told by noattr2 to turn it off
1356          */
1357         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1358             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1359                 mp->m_flags |= XFS_MOUNT_ATTR2;
1360 
1361         /*
1362          * prohibit r/w mounts of read-only filesystems
1363          */
1364         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1365                 xfs_warn(mp,
1366                         "cannot mount a read-only filesystem as read-write");
1367                 return -EROFS;
1368         }
1369 
1370         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1371             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1372             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1373                 xfs_warn(mp,
1374                   "Super block does not support project and group quota together");
1375                 return -EINVAL;
1376         }
1377 
1378         return 0;
1379 }
1380 
1381 static int
1382 xfs_init_percpu_counters(
1383         struct xfs_mount        *mp)
1384 {
1385         int             error;
1386 
1387         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1388         if (error)
1389                 return -ENOMEM;
1390 
1391         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1392         if (error)
1393                 goto free_icount;
1394 
1395         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1396         if (error)
1397                 goto free_ifree;
1398 
1399         return 0;
1400 
1401 free_ifree:
1402         percpu_counter_destroy(&mp->m_ifree);
1403 free_icount:
1404         percpu_counter_destroy(&mp->m_icount);
1405         return -ENOMEM;
1406 }
1407 
1408 void
1409 xfs_reinit_percpu_counters(
1410         struct xfs_mount        *mp)
1411 {
1412         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1413         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1414         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1415 }
1416 
1417 static void
1418 xfs_destroy_percpu_counters(
1419         struct xfs_mount        *mp)
1420 {
1421         percpu_counter_destroy(&mp->m_icount);
1422         percpu_counter_destroy(&mp->m_ifree);
1423         percpu_counter_destroy(&mp->m_fdblocks);
1424 }
1425 
1426 STATIC int
1427 xfs_fs_fill_super(
1428         struct super_block      *sb,
1429         void                    *data,
1430         int                     silent)
1431 {
1432         struct inode            *root;
1433         struct xfs_mount        *mp = NULL;
1434         int                     flags = 0, error = -ENOMEM;
1435 
1436         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1437         if (!mp)
1438                 goto out;
1439 
1440         spin_lock_init(&mp->m_sb_lock);
1441         mutex_init(&mp->m_growlock);
1442         atomic_set(&mp->m_active_trans, 0);
1443         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1444         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1445         mp->m_kobj.kobject.kset = xfs_kset;
1446 
1447         mp->m_super = sb;
1448         sb->s_fs_info = mp;
1449 
1450         error = xfs_parseargs(mp, (char *)data);
1451         if (error)
1452                 goto out_free_fsname;
1453 
1454         sb_min_blocksize(sb, BBSIZE);
1455         sb->s_xattr = xfs_xattr_handlers;
1456         sb->s_export_op = &xfs_export_operations;
1457 #ifdef CONFIG_XFS_QUOTA
1458         sb->s_qcop = &xfs_quotactl_operations;
1459         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1460 #endif
1461         sb->s_op = &xfs_super_operations;
1462 
1463         if (silent)
1464                 flags |= XFS_MFSI_QUIET;
1465 
1466         error = xfs_open_devices(mp);
1467         if (error)
1468                 goto out_free_fsname;
1469 
1470         error = xfs_init_mount_workqueues(mp);
1471         if (error)
1472                 goto out_close_devices;
1473 
1474         error = xfs_init_percpu_counters(mp);
1475         if (error)
1476                 goto out_destroy_workqueues;
1477 
1478         /* Allocate stats memory before we do operations that might use it */
1479         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1480         if (!mp->m_stats.xs_stats) {
1481                 error = -ENOMEM;
1482                 goto out_destroy_counters;
1483         }
1484 
1485         error = xfs_readsb(mp, flags);
1486         if (error)
1487                 goto out_free_stats;
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         if (xfs_sb_version_hassparseinodes(&mp->m_sb))
1532                 xfs_alert(mp,
1533         "EXPERIMENTAL sparse inode feature enabled. Use at your own risk!");
1534 
1535         error = xfs_mountfs(mp);
1536         if (error)
1537                 goto out_filestream_unmount;
1538 
1539         root = igrab(VFS_I(mp->m_rootip));
1540         if (!root) {
1541                 error = -ENOENT;
1542                 goto out_unmount;
1543         }
1544         sb->s_root = d_make_root(root);
1545         if (!sb->s_root) {
1546                 error = -ENOMEM;
1547                 goto out_unmount;
1548         }
1549 
1550         return 0;
1551 
1552  out_filestream_unmount:
1553         xfs_filestream_unmount(mp);
1554  out_free_sb:
1555         xfs_freesb(mp);
1556  out_free_stats:
1557         free_percpu(mp->m_stats.xs_stats);
1558  out_destroy_counters:
1559         xfs_destroy_percpu_counters(mp);
1560  out_destroy_workqueues:
1561         xfs_destroy_mount_workqueues(mp);
1562  out_close_devices:
1563         xfs_close_devices(mp);
1564  out_free_fsname:
1565         xfs_free_fsname(mp);
1566         kfree(mp);
1567  out:
1568         return error;
1569 
1570  out_unmount:
1571         xfs_filestream_unmount(mp);
1572         xfs_unmountfs(mp);
1573         goto out_free_sb;
1574 }
1575 
1576 STATIC void
1577 xfs_fs_put_super(
1578         struct super_block      *sb)
1579 {
1580         struct xfs_mount        *mp = XFS_M(sb);
1581 
1582         xfs_notice(mp, "Unmounting Filesystem");
1583         xfs_filestream_unmount(mp);
1584         xfs_unmountfs(mp);
1585 
1586         xfs_freesb(mp);
1587         free_percpu(mp->m_stats.xs_stats);
1588         xfs_destroy_percpu_counters(mp);
1589         xfs_destroy_mount_workqueues(mp);
1590         xfs_close_devices(mp);
1591         xfs_free_fsname(mp);
1592         kfree(mp);
1593 }
1594 
1595 STATIC struct dentry *
1596 xfs_fs_mount(
1597         struct file_system_type *fs_type,
1598         int                     flags,
1599         const char              *dev_name,
1600         void                    *data)
1601 {
1602         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1603 }
1604 
1605 static long
1606 xfs_fs_nr_cached_objects(
1607         struct super_block      *sb,
1608         struct shrink_control   *sc)
1609 {
1610         return xfs_reclaim_inodes_count(XFS_M(sb));
1611 }
1612 
1613 static long
1614 xfs_fs_free_cached_objects(
1615         struct super_block      *sb,
1616         struct shrink_control   *sc)
1617 {
1618         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1619 }
1620 
1621 static const struct super_operations xfs_super_operations = {
1622         .alloc_inode            = xfs_fs_alloc_inode,
1623         .destroy_inode          = xfs_fs_destroy_inode,
1624         .evict_inode            = xfs_fs_evict_inode,
1625         .drop_inode             = xfs_fs_drop_inode,
1626         .put_super              = xfs_fs_put_super,
1627         .sync_fs                = xfs_fs_sync_fs,
1628         .freeze_fs              = xfs_fs_freeze,
1629         .unfreeze_fs            = xfs_fs_unfreeze,
1630         .statfs                 = xfs_fs_statfs,
1631         .remount_fs             = xfs_fs_remount,
1632         .show_options           = xfs_fs_show_options,
1633         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1634         .free_cached_objects    = xfs_fs_free_cached_objects,
1635 };
1636 
1637 static struct file_system_type xfs_fs_type = {
1638         .owner                  = THIS_MODULE,
1639         .name                   = "xfs",
1640         .mount                  = xfs_fs_mount,
1641         .kill_sb                = kill_block_super,
1642         .fs_flags               = FS_REQUIRES_DEV,
1643 };
1644 MODULE_ALIAS_FS("xfs");
1645 
1646 STATIC int __init
1647 xfs_init_zones(void)
1648 {
1649 
1650         xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
1651         if (!xfs_ioend_zone)
1652                 goto out;
1653 
1654         xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
1655                                                   xfs_ioend_zone);
1656         if (!xfs_ioend_pool)
1657                 goto out_destroy_ioend_zone;
1658 
1659         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1660                                                 "xfs_log_ticket");
1661         if (!xfs_log_ticket_zone)
1662                 goto out_destroy_ioend_pool;
1663 
1664         xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
1665                                                 "xfs_bmap_free_item");
1666         if (!xfs_bmap_free_item_zone)
1667                 goto out_destroy_log_ticket_zone;
1668 
1669         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1670                                                 "xfs_btree_cur");
1671         if (!xfs_btree_cur_zone)
1672                 goto out_destroy_bmap_free_item_zone;
1673 
1674         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1675                                                 "xfs_da_state");
1676         if (!xfs_da_state_zone)
1677                 goto out_destroy_btree_cur_zone;
1678 
1679         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1680         if (!xfs_ifork_zone)
1681                 goto out_destroy_da_state_zone;
1682 
1683         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1684         if (!xfs_trans_zone)
1685                 goto out_destroy_ifork_zone;
1686 
1687         xfs_log_item_desc_zone =
1688                 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1689                                "xfs_log_item_desc");
1690         if (!xfs_log_item_desc_zone)
1691                 goto out_destroy_trans_zone;
1692 
1693         /*
1694          * The size of the zone allocated buf log item is the maximum
1695          * size possible under XFS.  This wastes a little bit of memory,
1696          * but it is much faster.
1697          */
1698         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1699                                            "xfs_buf_item");
1700         if (!xfs_buf_item_zone)
1701                 goto out_destroy_log_item_desc_zone;
1702 
1703         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1704                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1705                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1706         if (!xfs_efd_zone)
1707                 goto out_destroy_buf_item_zone;
1708 
1709         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1710                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1711                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1712         if (!xfs_efi_zone)
1713                 goto out_destroy_efd_zone;
1714 
1715         xfs_inode_zone =
1716                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1717                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD,
1718                         xfs_fs_inode_init_once);
1719         if (!xfs_inode_zone)
1720                 goto out_destroy_efi_zone;
1721 
1722         xfs_ili_zone =
1723                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1724                                         KM_ZONE_SPREAD, NULL);
1725         if (!xfs_ili_zone)
1726                 goto out_destroy_inode_zone;
1727         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1728                                         "xfs_icr");
1729         if (!xfs_icreate_zone)
1730                 goto out_destroy_ili_zone;
1731 
1732         return 0;
1733 
1734  out_destroy_ili_zone:
1735         kmem_zone_destroy(xfs_ili_zone);
1736  out_destroy_inode_zone:
1737         kmem_zone_destroy(xfs_inode_zone);
1738  out_destroy_efi_zone:
1739         kmem_zone_destroy(xfs_efi_zone);
1740  out_destroy_efd_zone:
1741         kmem_zone_destroy(xfs_efd_zone);
1742  out_destroy_buf_item_zone:
1743         kmem_zone_destroy(xfs_buf_item_zone);
1744  out_destroy_log_item_desc_zone:
1745         kmem_zone_destroy(xfs_log_item_desc_zone);
1746  out_destroy_trans_zone:
1747         kmem_zone_destroy(xfs_trans_zone);
1748  out_destroy_ifork_zone:
1749         kmem_zone_destroy(xfs_ifork_zone);
1750  out_destroy_da_state_zone:
1751         kmem_zone_destroy(xfs_da_state_zone);
1752  out_destroy_btree_cur_zone:
1753         kmem_zone_destroy(xfs_btree_cur_zone);
1754  out_destroy_bmap_free_item_zone:
1755         kmem_zone_destroy(xfs_bmap_free_item_zone);
1756  out_destroy_log_ticket_zone:
1757         kmem_zone_destroy(xfs_log_ticket_zone);
1758  out_destroy_ioend_pool:
1759         mempool_destroy(xfs_ioend_pool);
1760  out_destroy_ioend_zone:
1761         kmem_zone_destroy(xfs_ioend_zone);
1762  out:
1763         return -ENOMEM;
1764 }
1765 
1766 STATIC void
1767 xfs_destroy_zones(void)
1768 {
1769         /*
1770          * Make sure all delayed rcu free are flushed before we
1771          * destroy caches.
1772          */
1773         rcu_barrier();
1774         kmem_zone_destroy(xfs_icreate_zone);
1775         kmem_zone_destroy(xfs_ili_zone);
1776         kmem_zone_destroy(xfs_inode_zone);
1777         kmem_zone_destroy(xfs_efi_zone);
1778         kmem_zone_destroy(xfs_efd_zone);
1779         kmem_zone_destroy(xfs_buf_item_zone);
1780         kmem_zone_destroy(xfs_log_item_desc_zone);
1781         kmem_zone_destroy(xfs_trans_zone);
1782         kmem_zone_destroy(xfs_ifork_zone);
1783         kmem_zone_destroy(xfs_da_state_zone);
1784         kmem_zone_destroy(xfs_btree_cur_zone);
1785         kmem_zone_destroy(xfs_bmap_free_item_zone);
1786         kmem_zone_destroy(xfs_log_ticket_zone);
1787         mempool_destroy(xfs_ioend_pool);
1788         kmem_zone_destroy(xfs_ioend_zone);
1789 
1790 }
1791 
1792 STATIC int __init
1793 xfs_init_workqueues(void)
1794 {
1795         /*
1796          * The allocation workqueue can be used in memory reclaim situations
1797          * (writepage path), and parallelism is only limited by the number of
1798          * AGs in all the filesystems mounted. Hence use the default large
1799          * max_active value for this workqueue.
1800          */
1801         xfs_alloc_wq = alloc_workqueue("xfsalloc",
1802                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
1803         if (!xfs_alloc_wq)
1804                 return -ENOMEM;
1805 
1806         return 0;
1807 }
1808 
1809 STATIC void
1810 xfs_destroy_workqueues(void)
1811 {
1812         destroy_workqueue(xfs_alloc_wq);
1813 }
1814 
1815 STATIC int __init
1816 init_xfs_fs(void)
1817 {
1818         int                     error;
1819 
1820         printk(KERN_INFO XFS_VERSION_STRING " with "
1821                          XFS_BUILD_OPTIONS " enabled\n");
1822 
1823         xfs_dir_startup();
1824 
1825         error = xfs_init_zones();
1826         if (error)
1827                 goto out;
1828 
1829         error = xfs_init_workqueues();
1830         if (error)
1831                 goto out_destroy_zones;
1832 
1833         error = xfs_mru_cache_init();
1834         if (error)
1835                 goto out_destroy_wq;
1836 
1837         error = xfs_buf_init();
1838         if (error)
1839                 goto out_mru_cache_uninit;
1840 
1841         error = xfs_init_procfs();
1842         if (error)
1843                 goto out_buf_terminate;
1844 
1845         error = xfs_sysctl_register();
1846         if (error)
1847                 goto out_cleanup_procfs;
1848 
1849         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
1850         if (!xfs_kset) {
1851                 error = -ENOMEM;
1852                 goto out_sysctl_unregister;
1853         }
1854 
1855         xfsstats.xs_kobj.kobject.kset = xfs_kset;
1856 
1857         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
1858         if (!xfsstats.xs_stats) {
1859                 error = -ENOMEM;
1860                 goto out_kset_unregister;
1861         }
1862 
1863         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
1864                                "stats");
1865         if (error)
1866                 goto out_free_stats;
1867 
1868 #ifdef DEBUG
1869         xfs_dbg_kobj.kobject.kset = xfs_kset;
1870         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
1871         if (error)
1872                 goto out_remove_stats_kobj;
1873 #endif
1874 
1875         error = xfs_qm_init();
1876         if (error)
1877                 goto out_remove_dbg_kobj;
1878 
1879         error = register_filesystem(&xfs_fs_type);
1880         if (error)
1881                 goto out_qm_exit;
1882         return 0;
1883 
1884  out_qm_exit:
1885         xfs_qm_exit();
1886  out_remove_dbg_kobj:
1887 #ifdef DEBUG
1888         xfs_sysfs_del(&xfs_dbg_kobj);
1889  out_remove_stats_kobj:
1890 #endif
1891         xfs_sysfs_del(&xfsstats.xs_kobj);
1892  out_free_stats:
1893         free_percpu(xfsstats.xs_stats);
1894  out_kset_unregister:
1895         kset_unregister(xfs_kset);
1896  out_sysctl_unregister:
1897         xfs_sysctl_unregister();
1898  out_cleanup_procfs:
1899         xfs_cleanup_procfs();
1900  out_buf_terminate:
1901         xfs_buf_terminate();
1902  out_mru_cache_uninit:
1903         xfs_mru_cache_uninit();
1904  out_destroy_wq:
1905         xfs_destroy_workqueues();
1906  out_destroy_zones:
1907         xfs_destroy_zones();
1908  out:
1909         return error;
1910 }
1911 
1912 STATIC void __exit
1913 exit_xfs_fs(void)
1914 {
1915         xfs_qm_exit();
1916         unregister_filesystem(&xfs_fs_type);
1917 #ifdef DEBUG
1918         xfs_sysfs_del(&xfs_dbg_kobj);
1919 #endif
1920         xfs_sysfs_del(&xfsstats.xs_kobj);
1921         free_percpu(xfsstats.xs_stats);
1922         kset_unregister(xfs_kset);
1923         xfs_sysctl_unregister();
1924         xfs_cleanup_procfs();
1925         xfs_buf_terminate();
1926         xfs_mru_cache_uninit();
1927         xfs_destroy_workqueues();
1928         xfs_destroy_zones();
1929         xfs_uuid_table_free();
1930 }
1931 
1932 module_init(init_xfs_fs);
1933 module_exit(exit_xfs_fs);
1934 
1935 MODULE_AUTHOR("Silicon Graphics, Inc.");
1936 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
1937 MODULE_LICENSE("GPL");
1938 

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