fs/xfs/xfs_super.c

   1 /*
   2  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 #include "xfs.h"
  20 #include "xfs_shared.h"
  21 #include "xfs_format.h"
  22 #include "xfs_log_format.h"
  23 #include "xfs_trans_resv.h"
  24 #include "xfs_sb.h"
  25 #include "xfs_mount.h"
  26 #include "xfs_da_format.h"
  27 #include "xfs_inode.h"
  28 #include "xfs_btree.h"
  29 #include "xfs_bmap.h"
  30 #include "xfs_alloc.h"
  31 #include "xfs_error.h"
  32 #include "xfs_fsops.h"
  33 #include "xfs_trans.h"
  34 #include "xfs_buf_item.h"
  35 #include "xfs_log.h"
  36 #include "xfs_log_priv.h"
  37 #include "xfs_da_btree.h"
  38 #include "xfs_dir2.h"
  39 #include "xfs_extfree_item.h"
  40 #include "xfs_mru_cache.h"
  41 #include "xfs_inode_item.h"
  42 #include "xfs_icache.h"
  43 #include "xfs_trace.h"
  44 #include "xfs_icreate_item.h"
  45 #include "xfs_filestream.h"
  46 #include "xfs_quota.h"
  47 #include "xfs_sysfs.h"
  48 #include "xfs_ondisk.h"
  49
  50 #include <linux/namei.h>
  51 #include <linux/init.h>
  52 #include <linux/slab.h>
  53 #include <linux/mount.h>
  54 #include <linux/mempool.h>
  55 #include <linux/writeback.h>
  56 #include <linux/kthread.h>
  57 #include <linux/freezer.h>
  58 #include <linux/parser.h>
  59
  60 static const struct super_operations xfs_super_operations;
  61 struct bio_set *xfs_ioend_bioset;
  62
  63 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
  64 #ifdef DEBUG
  65 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
  66 #endif
  67
  68 /*
  69  * Table driven mount option parser.
  70  */
  71 enum {
  72         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev, Opt_biosize,
  73         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
  74         Opt_mtpt, Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
  75         Opt_allocsize, Opt_norecovery, Opt_barrier, Opt_nobarrier,
  76         Opt_inode64, Opt_inode32, Opt_ikeep, Opt_noikeep,
  77         Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2, Opt_filestreams,
  78         Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota, Opt_prjquota,
  79         Opt_uquota, Opt_gquota, Opt_pquota,
  80         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
  81         Opt_discard, Opt_nodiscard, Opt_dax, Opt_err,
  82 };
  83
  84 static const match_table_t tokens = {
  85         {Opt_logbufs,   "logbufs=%u"},  /* number of XFS log buffers */
  86         {Opt_logbsize,  "logbsize=%s"}, /* size of XFS log buffers */
  87         {Opt_logdev,    "logdev=%s"},   /* log device */
  88         {Opt_rtdev,     "rtdev=%s"},    /* realtime I/O device */
  89         {Opt_biosize,   "biosize=%u"},  /* log2 of preferred buffered io size */
  90         {Opt_wsync,     "wsync"},       /* safe-mode nfs compatible mount */
  91         {Opt_noalign,   "noalign"},     /* turn off stripe alignment */
  92         {Opt_swalloc,   "swalloc"},     /* turn on stripe width allocation */
  93         {Opt_sunit,     "sunit=%u"},    /* data volume stripe unit */
  94         {Opt_swidth,    "swidth=%u"},   /* data volume stripe width */
  95         {Opt_nouuid,    "nouuid"},      /* ignore filesystem UUID */
  96         {Opt_mtpt,      "mtpt"},        /* filesystem mount point */
  97         {Opt_grpid,     "grpid"},       /* group-ID from parent directory */
  98         {Opt_nogrpid,   "nogrpid"},     /* group-ID from current process */
  99         {Opt_bsdgroups, "bsdgroups"},   /* group-ID from parent directory */
 100         {Opt_sysvgroups,"sysvgroups"},  /* group-ID from current process */
 101         {Opt_allocsize, "allocsize=%s"},/* preferred allocation size */
 102         {Opt_norecovery,"norecovery"},  /* don't run XFS recovery */
 103         {Opt_barrier,   "barrier"},     /* use writer barriers for log write and
 104                                          * unwritten extent conversion */
 105         {Opt_nobarrier, "nobarrier"},   /* .. disable */
 106         {Opt_inode64,   "inode64"},     /* inodes can be allocated anywhere */
 107         {Opt_inode32,   "inode32"},     /* inode allocation limited to
 108                                          * XFS_MAXINUMBER_32 */
 109         {Opt_ikeep,     "ikeep"},       /* do not free empty inode clusters */
 110         {Opt_noikeep,   "noikeep"},     /* free empty inode clusters */
 111         {Opt_largeio,   "largeio"},     /* report large I/O sizes in stat() */
 112         {Opt_nolargeio, "nolargeio"},   /* do not report large I/O sizes
 113                                          * in stat(). */
 114         {Opt_attr2,     "attr2"},       /* do use attr2 attribute format */
 115         {Opt_noattr2,   "noattr2"},     /* do not use attr2 attribute format */
 116         {Opt_filestreams,"filestreams"},/* use filestreams allocator */
 117         {Opt_quota,     "quota"},       /* disk quotas (user) */
 118         {Opt_noquota,   "noquota"},     /* no quotas */
 119         {Opt_usrquota,  "usrquota"},    /* user quota enabled */
 120         {Opt_grpquota,  "grpquota"},    /* group quota enabled */
 121         {Opt_prjquota,  "prjquota"},    /* project quota enabled */
 122         {Opt_uquota,    "uquota"},      /* user quota (IRIX variant) */
 123         {Opt_gquota,    "gquota"},      /* group quota (IRIX variant) */
 124         {Opt_pquota,    "pquota"},      /* project quota (IRIX variant) */
 125         {Opt_uqnoenforce,"uqnoenforce"},/* user quota limit enforcement */
 126         {Opt_gqnoenforce,"gqnoenforce"},/* group quota limit enforcement */
 127         {Opt_pqnoenforce,"pqnoenforce"},/* project quota limit enforcement */
 128         {Opt_qnoenforce, "qnoenforce"}, /* same as uqnoenforce */
 129         {Opt_discard,   "discard"},     /* Discard unused blocks */
 130         {Opt_nodiscard, "nodiscard"},   /* Do not discard unused blocks */
 131
 132         {Opt_dax,       "dax"},         /* Enable direct access to bdev pages */
 133         {Opt_err,       NULL},
 134 };
 135
 136
 137 STATIC int
 138 suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
 139 {
 140         int     last, shift_left_factor = 0, _res;
 141         char    *value;
 142         int     ret = 0;
 143
 144         value = match_strdup(s);
 145         if (!value)
 146                 return -ENOMEM;
 147
 148         last = strlen(value) - 1;
 149         if (value[last] == 'K' || value[last] == 'k') {
 150                 shift_left_factor = 10;
 151                 value[last] = '\0';
 152         }
 153         if (value[last] == 'M' || value[last] == 'm') {
 154                 shift_left_factor = 20;
 155                 value[last] = '\0';
 156         }
 157         if (value[last] == 'G' || value[last] == 'g') {
 158                 shift_left_factor = 30;
 159                 value[last] = '\0';
 160         }
 161
 162         if (kstrtoint(value, base, &_res))
 163                 ret = -EINVAL;
 164         kfree(value);
 165         *res = _res << shift_left_factor;
 166         return ret;
 167 }
 168
 169 /*
 170  * This function fills in xfs_mount_t fields based on mount args.
 171  * Note: the superblock has _not_ yet been read in.
 172  *
 173  * Note that this function leaks the various device name allocations on
 174  * failure.  The caller takes care of them.
 175  *
 176  * *sb is const because this is also used to test options on the remount
 177  * path, and we don't want this to have any side effects at remount time.
 178  * Today this function does not change *sb, but just to future-proof...
 179  */
 180 STATIC int
 181 xfs_parseargs(
 182         struct xfs_mount        *mp,
 183         char                    *options)
 184 {
 185         const struct super_block *sb = mp->m_super;
 186         char                    *p;
 187         substring_t             args[MAX_OPT_ARGS];
 188         int                     dsunit = 0;
 189         int                     dswidth = 0;
 190         int                     iosize = 0;
 191         __uint8_t               iosizelog = 0;
 192
 193         /*
 194          * set up the mount name first so all the errors will refer to the
 195          * correct device.
 196          */
 197         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
 198         if (!mp->m_fsname)
 199                 return -ENOMEM;
 200         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
 201
 202         /*
 203          * Copy binary VFS mount flags we are interested in.
 204          */
 205         if (sb->s_flags & MS_RDONLY)
 206                 mp->m_flags |= XFS_MOUNT_RDONLY;
 207         if (sb->s_flags & MS_DIRSYNC)
 208                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
 209         if (sb->s_flags & MS_SYNCHRONOUS)
 210                 mp->m_flags |= XFS_MOUNT_WSYNC;
 211
 212         /*
 213          * Set some default flags that could be cleared by the mount option
 214          * parsing.
 215          */
 216         mp->m_flags |= XFS_MOUNT_BARRIER;
 217         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
 218
 219         /*
 220          * These can be overridden by the mount option parsing.
 221          */
 222         mp->m_logbufs = -1;
 223         mp->m_logbsize = -1;
 224
 225         if (!options)
 226                 goto done;
 227
 228         while ((p = strsep(&options, ",")) != NULL) {
 229                 int             token;
 230
 231                 if (!*p)
 232                         continue;
 233
 234                 token = match_token(p, tokens, args);
 235                 switch (token) {
 236                 case Opt_logbufs:
 237                         if (match_int(args, &mp->m_logbufs))
 238                                 return -EINVAL;
 239                         break;
 240                 case Opt_logbsize:
 241                         if (suffix_kstrtoint(args, 10, &mp->m_logbsize))
 242                                 return -EINVAL;
 243                         break;
 244                 case Opt_logdev:
 245                         mp->m_logname = match_strdup(args);
 246                         if (!mp->m_logname)
 247                                 return -ENOMEM;
 248                         break;
 249                 case Opt_mtpt:
 250                         xfs_warn(mp, "%s option not allowed on this system", p);
 251                         return -EINVAL;
 252                 case Opt_rtdev:
 253                         mp->m_rtname = match_strdup(args);
 254                         if (!mp->m_rtname)
 255                                 return -ENOMEM;
 256                         break;
 257                 case Opt_allocsize:
 258                 case Opt_biosize:
 259                         if (suffix_kstrtoint(args, 10, &iosize))
 260                                 return -EINVAL;
 261                         iosizelog = ffs(iosize) - 1;
 262                         break;
 263                 case Opt_grpid:
 264                 case Opt_bsdgroups:
 265                         mp->m_flags |= XFS_MOUNT_GRPID;
 266                         break;
 267                 case Opt_nogrpid:
 268                 case Opt_sysvgroups:
 269                         mp->m_flags &= ~XFS_MOUNT_GRPID;
 270                         break;
 271                 case Opt_wsync:
 272                         mp->m_flags |= XFS_MOUNT_WSYNC;
 273                         break;
 274                 case Opt_norecovery:
 275                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
 276                         break;
 277                 case Opt_noalign:
 278                         mp->m_flags |= XFS_MOUNT_NOALIGN;
 279                         break;
 280                 case Opt_swalloc:
 281                         mp->m_flags |= XFS_MOUNT_SWALLOC;
 282                         break;
 283                 case Opt_sunit:
 284                         if (match_int(args, &dsunit))
 285                                 return -EINVAL;
 286                         break;
 287                 case Opt_swidth:
 288                         if (match_int(args, &dswidth))
 289                                 return -EINVAL;
 290                         break;
 291                 case Opt_inode32:
 292                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
 293                         break;
 294                 case Opt_inode64:
 295                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
 296                         break;
 297                 case Opt_nouuid:
 298                         mp->m_flags |= XFS_MOUNT_NOUUID;
 299                         break;
 300                 case Opt_barrier:
 301                         mp->m_flags |= XFS_MOUNT_BARRIER;
 302                         break;
 303                 case Opt_nobarrier:
 304                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
 305                         break;
 306                 case Opt_ikeep:
 307                         mp->m_flags |= XFS_MOUNT_IKEEP;
 308                         break;
 309                 case Opt_noikeep:
 310                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
 311                         break;
 312                 case Opt_largeio:
 313                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
 314                         break;
 315                 case Opt_nolargeio:
 316                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
 317                         break;
 318                 case Opt_attr2:
 319                         mp->m_flags |= XFS_MOUNT_ATTR2;
 320                         break;
 321                 case Opt_noattr2:
 322                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
 323                         mp->m_flags |= XFS_MOUNT_NOATTR2;
 324                         break;
 325                 case Opt_filestreams:
 326                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
 327                         break;
 328                 case Opt_noquota:
 329                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
 330                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
 331                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
 332                         break;
 333                 case Opt_quota:
 334                 case Opt_uquota:
 335                 case Opt_usrquota:
 336                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
 337                                          XFS_UQUOTA_ENFD);
 338                         break;
 339                 case Opt_qnoenforce:
 340                 case Opt_uqnoenforce:
 341                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
 342                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
 343                         break;
 344                 case Opt_pquota:
 345                 case Opt_prjquota:
 346                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
 347                                          XFS_PQUOTA_ENFD);
 348                         break;
 349                 case Opt_pqnoenforce:
 350                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
 351                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
 352                         break;
 353                 case Opt_gquota:
 354                 case Opt_grpquota:
 355                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
 356                                          XFS_GQUOTA_ENFD);
 357                         break;
 358                 case Opt_gqnoenforce:
 359                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
 360                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
 361                         break;
 362                 case Opt_discard:
 363                         mp->m_flags |= XFS_MOUNT_DISCARD;
 364                         break;
 365                 case Opt_nodiscard:
 366                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
 367                         break;
 368 #ifdef CONFIG_FS_DAX
 369                 case Opt_dax:
 370                         mp->m_flags |= XFS_MOUNT_DAX;
 371                         break;
 372 #endif
 373                 default:
 374                         xfs_warn(mp, "unknown mount option [%s].", p);
 375                         return -EINVAL;
 376                 }
 377         }
 378
 379         /*
 380          * no recovery flag requires a read-only mount
 381          */
 382         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
 383             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
 384                 xfs_warn(mp, "no-recovery mounts must be read-only.");
 385                 return -EINVAL;
 386         }
 387
 388         if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
 389                 xfs_warn(mp,
 390         "sunit and swidth options incompatible with the noalign option");
 391                 return -EINVAL;
 392         }
 393
 394 #ifndef CONFIG_XFS_QUOTA
 395         if (XFS_IS_QUOTA_RUNNING(mp)) {
 396                 xfs_warn(mp, "quota support not available in this kernel.");
 397                 return -EINVAL;
 398         }
 399 #endif
 400
 401         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
 402                 xfs_warn(mp, "sunit and swidth must be specified together");
 403                 return -EINVAL;
 404         }
 405
 406         if (dsunit && (dswidth % dsunit != 0)) {
 407                 xfs_warn(mp,
 408         "stripe width (%d) must be a multiple of the stripe unit (%d)",
 409                         dswidth, dsunit);
 410                 return -EINVAL;
 411         }
 412
 413 done:
 414         if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
 415                 /*
 416                  * At this point the superblock has not been read
 417                  * in, therefore we do not know the block size.
 418                  * Before the mount call ends we will convert
 419                  * these to FSBs.
 420                  */
 421                 mp->m_dalign = dsunit;
 422                 mp->m_swidth = dswidth;
 423         }
 424
 425         if (mp->m_logbufs != -1 &&
 426             mp->m_logbufs != 0 &&
 427             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
 428              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
 429                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
 430                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
 431                 return -EINVAL;
 432         }
 433         if (mp->m_logbsize != -1 &&
 434             mp->m_logbsize !=  0 &&
 435             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
 436              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
 437              !is_power_of_2(mp->m_logbsize))) {
 438                 xfs_warn(mp,
 439                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
 440                         mp->m_logbsize);
 441                 return -EINVAL;
 442         }
 443
 444         if (iosizelog) {
 445                 if (iosizelog > XFS_MAX_IO_LOG ||
 446                     iosizelog < XFS_MIN_IO_LOG) {
 447                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
 448                                 iosizelog, XFS_MIN_IO_LOG,
 449                                 XFS_MAX_IO_LOG);
 450                         return -EINVAL;
 451                 }
 452
 453                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
 454                 mp->m_readio_log = iosizelog;
 455                 mp->m_writeio_log = iosizelog;
 456         }
 457
 458         return 0;
 459 }
 460
 461 struct proc_xfs_info {
 462         uint64_t        flag;
 463         char            *str;
 464 };
 465
 466 STATIC int
 467 xfs_showargs(
 468         struct xfs_mount        *mp,
 469         struct seq_file         *m)
 470 {
 471         static struct proc_xfs_info xfs_info_set[] = {
 472                 /* the few simple ones we can get from the mount struct */
 473                 { XFS_MOUNT_IKEEP,              ",ikeep" },
 474                 { XFS_MOUNT_WSYNC,              ",wsync" },
 475                 { XFS_MOUNT_NOALIGN,            ",noalign" },
 476                 { XFS_MOUNT_SWALLOC,            ",swalloc" },
 477                 { XFS_MOUNT_NOUUID,             ",nouuid" },
 478                 { XFS_MOUNT_NORECOVERY,         ",norecovery" },
 479                 { XFS_MOUNT_ATTR2,              ",attr2" },
 480                 { XFS_MOUNT_FILESTREAMS,        ",filestreams" },
 481                 { XFS_MOUNT_GRPID,              ",grpid" },
 482                 { XFS_MOUNT_DISCARD,            ",discard" },
 483                 { XFS_MOUNT_SMALL_INUMS,        ",inode32" },
 484                 { XFS_MOUNT_DAX,                ",dax" },
 485                 { 0, NULL }
 486         };
 487         static struct proc_xfs_info xfs_info_unset[] = {
 488                 /* the few simple ones we can get from the mount struct */
 489                 { XFS_MOUNT_COMPAT_IOSIZE,      ",largeio" },
 490                 { XFS_MOUNT_BARRIER,            ",nobarrier" },
 491                 { XFS_MOUNT_SMALL_INUMS,        ",inode64" },
 492                 { 0, NULL }
 493         };
 494         struct proc_xfs_info    *xfs_infop;
 495
 496         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
 497                 if (mp->m_flags & xfs_infop->flag)
 498                         seq_puts(m, xfs_infop->str);
 499         }
 500         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
 501                 if (!(mp->m_flags & xfs_infop->flag))
 502                         seq_puts(m, xfs_infop->str);
 503         }
 504
 505         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
 506                 seq_printf(m, ",allocsize=%dk",
 507                                 (int)(1 << mp->m_writeio_log) >> 10);
 508
 509         if (mp->m_logbufs > 0)
 510                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
 511         if (mp->m_logbsize > 0)
 512                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
 513
 514         if (mp->m_logname)
 515                 seq_show_option(m, "logdev", mp->m_logname);
 516         if (mp->m_rtname)
 517                 seq_show_option(m, "rtdev", mp->m_rtname);
 518
 519         if (mp->m_dalign > 0)
 520                 seq_printf(m, ",sunit=%d",
 521                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
 522         if (mp->m_swidth > 0)
 523                 seq_printf(m, ",swidth=%d",
 524                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
 525
 526         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
 527                 seq_puts(m, ",usrquota");
 528         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
 529                 seq_puts(m, ",uqnoenforce");
 530
 531         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
 532                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
 533                         seq_puts(m, ",prjquota");
 534                 else
 535                         seq_puts(m, ",pqnoenforce");
 536         }
 537         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
 538                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
 539                         seq_puts(m, ",grpquota");
 540                 else
 541                         seq_puts(m, ",gqnoenforce");
 542         }
 543
 544         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
 545                 seq_puts(m, ",noquota");
 546
 547         return 0;
 548 }
 549 static __uint64_t
 550 xfs_max_file_offset(
 551         unsigned int            blockshift)
 552 {
 553         unsigned int            pagefactor = 1;
 554         unsigned int            bitshift = BITS_PER_LONG - 1;
 555
 556         /* Figure out maximum filesize, on Linux this can depend on
 557          * the filesystem blocksize (on 32 bit platforms).
 558          * __block_write_begin does this in an [unsigned] long...
 559          *      page->index << (PAGE_SHIFT - bbits)
 560          * So, for page sized blocks (4K on 32 bit platforms),
 561          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
 562          *      (((u64)PAGE_SIZE << (BITS_PER_LONG-1))-1)
 563          * but for smaller blocksizes it is less (bbits = log2 bsize).
 564          * Note1: get_block_t takes a long (implicit cast from above)
 565          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
 566          * can optionally convert the [unsigned] long from above into
 567          * an [unsigned] long long.
 568          */
 569
 570 #if BITS_PER_LONG == 32
 571 # if defined(CONFIG_LBDAF)
 572         ASSERT(sizeof(sector_t) == 8);
 573         pagefactor = PAGE_SIZE;
 574         bitshift = BITS_PER_LONG;
 575 # else
 576         pagefactor = PAGE_SIZE >> (PAGE_SHIFT - blockshift);
 577 # endif
 578 #endif
 579
 580         return (((__uint64_t)pagefactor) << bitshift) - 1;
 581 }
 582
 583 /*
 584  * Set parameters for inode allocation heuristics, taking into account
 585  * filesystem size and inode32/inode64 mount options; i.e. specifically
 586  * whether or not XFS_MOUNT_SMALL_INUMS is set.
 587  *
 588  * Inode allocation patterns are altered only if inode32 is requested
 589  * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
 590  * If altered, XFS_MOUNT_32BITINODES is set as well.
 591  *
 592  * An agcount independent of that in the mount structure is provided
 593  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
 594  * to the potentially higher ag count.
 595  *
 596  * Returns the maximum AG index which may contain inodes.
 597  */
 598 xfs_agnumber_t
 599 xfs_set_inode_alloc(
 600         struct xfs_mount *mp,
 601         xfs_agnumber_t  agcount)
 602 {
 603         xfs_agnumber_t  index;
 604         xfs_agnumber_t  maxagi = 0;
 605         xfs_sb_t        *sbp = &mp->m_sb;
 606         xfs_agnumber_t  max_metadata;
 607         xfs_agino_t     agino;
 608         xfs_ino_t       ino;
 609
 610         /*
 611          * Calculate how much should be reserved for inodes to meet
 612          * the max inode percentage.  Used only for inode32.
 613          */
 614         if (mp->m_maxicount) {
 615                 __uint64_t      icount;
 616
 617                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
 618                 do_div(icount, 100);
 619                 icount += sbp->sb_agblocks - 1;
 620                 do_div(icount, sbp->sb_agblocks);
 621                 max_metadata = icount;
 622         } else {
 623                 max_metadata = agcount;
 624         }
 625
 626         /* Get the last possible inode in the filesystem */
 627         agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
 628         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
 629
 630         /*
 631          * If user asked for no more than 32-bit inodes, and the fs is
 632          * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
 633          * the allocator to accommodate the request.
 634          */
 635         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
 636                 mp->m_flags |= XFS_MOUNT_32BITINODES;
 637         else
 638                 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
 639
 640         for (index = 0; index < agcount; index++) {
 641                 struct xfs_perag        *pag;
 642
 643                 ino = XFS_AGINO_TO_INO(mp, index, agino);
 644
 645                 pag = xfs_perag_get(mp, index);
 646
 647                 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
 648                         if (ino > XFS_MAXINUMBER_32) {
 649                                 pag->pagi_inodeok = 0;
 650                                 pag->pagf_metadata = 0;
 651                         } else {
 652                                 pag->pagi_inodeok = 1;
 653                                 maxagi++;
 654                                 if (index < max_metadata)
 655                                         pag->pagf_metadata = 1;
 656                                 else
 657                                         pag->pagf_metadata = 0;
 658                         }
 659                 } else {
 660                         pag->pagi_inodeok = 1;
 661                         pag->pagf_metadata = 0;
 662                 }
 663
 664                 xfs_perag_put(pag);
 665         }
 666
 667         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
 668 }
 669
 670 STATIC int
 671 xfs_blkdev_get(
 672         xfs_mount_t             *mp,
 673         const char              *name,
 674         struct block_device     **bdevp)
 675 {
 676         int                     error = 0;
 677
 678         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
 679                                     mp);
 680         if (IS_ERR(*bdevp)) {
 681                 error = PTR_ERR(*bdevp);
 682                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
 683         }
 684
 685         return error;
 686 }
 687
 688 STATIC void
 689 xfs_blkdev_put(
 690         struct block_device     *bdev)
 691 {
 692         if (bdev)
 693                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 694 }
 695
 696 void
 697 xfs_blkdev_issue_flush(
 698         xfs_buftarg_t           *buftarg)
 699 {
 700         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
 701 }
 702
 703 STATIC void
 704 xfs_close_devices(
 705         struct xfs_mount        *mp)
 706 {
 707         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 708                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
 709                 xfs_free_buftarg(mp, mp->m_logdev_targp);
 710                 xfs_blkdev_put(logdev);
 711         }
 712         if (mp->m_rtdev_targp) {
 713                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
 714                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
 715                 xfs_blkdev_put(rtdev);
 716         }
 717         xfs_free_buftarg(mp, mp->m_ddev_targp);
 718 }
 719
 720 /*
 721  * The file system configurations are:
 722  *      (1) device (partition) with data and internal log
 723  *      (2) logical volume with data and log subvolumes.
 724  *      (3) logical volume with data, log, and realtime subvolumes.
 725  *
 726  * We only have to handle opening the log and realtime volumes here if
 727  * they are present.  The data subvolume has already been opened by
 728  * get_sb_bdev() and is stored in sb->s_bdev.
 729  */
 730 STATIC int
 731 xfs_open_devices(
 732         struct xfs_mount        *mp)
 733 {
 734         struct block_device     *ddev = mp->m_super->s_bdev;
 735         struct block_device     *logdev = NULL, *rtdev = NULL;
 736         int                     error;
 737
 738         /*
 739          * Open real time and log devices - order is important.
 740          */
 741         if (mp->m_logname) {
 742                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
 743                 if (error)
 744                         goto out;
 745         }
 746
 747         if (mp->m_rtname) {
 748                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
 749                 if (error)
 750                         goto out_close_logdev;
 751
 752                 if (rtdev == ddev || rtdev == logdev) {
 753                         xfs_warn(mp,
 754         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
 755                         error = -EINVAL;
 756                         goto out_close_rtdev;
 757                 }
 758         }
 759
 760         /*
 761          * Setup xfs_mount buffer target pointers
 762          */
 763         error = -ENOMEM;
 764         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev);
 765         if (!mp->m_ddev_targp)
 766                 goto out_close_rtdev;
 767
 768         if (rtdev) {
 769                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev);
 770                 if (!mp->m_rtdev_targp)
 771                         goto out_free_ddev_targ;
 772         }
 773
 774         if (logdev && logdev != ddev) {
 775                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
 776                 if (!mp->m_logdev_targp)
 777                         goto out_free_rtdev_targ;
 778         } else {
 779                 mp->m_logdev_targp = mp->m_ddev_targp;
 780         }
 781
 782         return 0;
 783
 784  out_free_rtdev_targ:
 785         if (mp->m_rtdev_targp)
 786                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
 787  out_free_ddev_targ:
 788         xfs_free_buftarg(mp, mp->m_ddev_targp);
 789  out_close_rtdev:
 790         xfs_blkdev_put(rtdev);
 791  out_close_logdev:
 792         if (logdev && logdev != ddev)
 793                 xfs_blkdev_put(logdev);
 794  out:
 795         return error;
 796 }
 797
 798 /*
 799  * Setup xfs_mount buffer target pointers based on superblock
 800  */
 801 STATIC int
 802 xfs_setup_devices(
 803         struct xfs_mount        *mp)
 804 {
 805         int                     error;
 806
 807         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
 808         if (error)
 809                 return error;
 810
 811         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 812                 unsigned int    log_sector_size = BBSIZE;
 813
 814                 if (xfs_sb_version_hassector(&mp->m_sb))
 815                         log_sector_size = mp->m_sb.sb_logsectsize;
 816                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
 817                                             log_sector_size);
 818                 if (error)
 819                         return error;
 820         }
 821         if (mp->m_rtdev_targp) {
 822                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
 823                                             mp->m_sb.sb_sectsize);
 824                 if (error)
 825                         return error;
 826         }
 827
 828         return 0;
 829 }
 830
 831 STATIC int
 832 xfs_init_mount_workqueues(
 833         struct xfs_mount        *mp)
 834 {
 835         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
 836                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
 837         if (!mp->m_buf_workqueue)
 838                 goto out;
 839
 840         mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
 841                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 842         if (!mp->m_data_workqueue)
 843                 goto out_destroy_buf;
 844
 845         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
 846                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 847         if (!mp->m_unwritten_workqueue)
 848                 goto out_destroy_data_iodone_queue;
 849
 850         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
 851                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 852         if (!mp->m_cil_workqueue)
 853                 goto out_destroy_unwritten;
 854
 855         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
 856                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 857         if (!mp->m_reclaim_workqueue)
 858                 goto out_destroy_cil;
 859
 860         mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
 861                         WQ_MEM_RECLAIM|WQ_FREEZABLE|WQ_HIGHPRI, 0,
 862                         mp->m_fsname);
 863         if (!mp->m_log_workqueue)
 864                 goto out_destroy_reclaim;
 865
 866         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
 867                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 868         if (!mp->m_eofblocks_workqueue)
 869                 goto out_destroy_log;
 870
 871         return 0;
 872
 873 out_destroy_log:
 874         destroy_workqueue(mp->m_log_workqueue);
 875 out_destroy_reclaim:
 876         destroy_workqueue(mp->m_reclaim_workqueue);
 877 out_destroy_cil:
 878         destroy_workqueue(mp->m_cil_workqueue);
 879 out_destroy_unwritten:
 880         destroy_workqueue(mp->m_unwritten_workqueue);
 881 out_destroy_data_iodone_queue:
 882         destroy_workqueue(mp->m_data_workqueue);
 883 out_destroy_buf:
 884         destroy_workqueue(mp->m_buf_workqueue);
 885 out:
 886         return -ENOMEM;
 887 }
 888
 889 STATIC void
 890 xfs_destroy_mount_workqueues(
 891         struct xfs_mount        *mp)
 892 {
 893         destroy_workqueue(mp->m_eofblocks_workqueue);
 894         destroy_workqueue(mp->m_log_workqueue);
 895         destroy_workqueue(mp->m_reclaim_workqueue);
 896         destroy_workqueue(mp->m_cil_workqueue);
 897         destroy_workqueue(mp->m_data_workqueue);
 898         destroy_workqueue(mp->m_unwritten_workqueue);
 899         destroy_workqueue(mp->m_buf_workqueue);
 900 }
 901
 902 /*
 903  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
 904  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
 905  * for IO to complete so that we effectively throttle multiple callers to the
 906  * rate at which IO is completing.
 907  */
 908 void
 909 xfs_flush_inodes(
 910         struct xfs_mount        *mp)
 911 {
 912         struct super_block      *sb = mp->m_super;
 913
 914         if (down_read_trylock(&sb->s_umount)) {
 915                 sync_inodes_sb(sb);
 916                 up_read(&sb->s_umount);
 917         }
 918 }
 919
 920 /* Catch misguided souls that try to use this interface on XFS */
 921 STATIC struct inode *
 922 xfs_fs_alloc_inode(
 923         struct super_block      *sb)
 924 {
 925         BUG();
 926         return NULL;
 927 }
 928
 929 /*
 930  * Now that the generic code is guaranteed not to be accessing
 931  * the linux inode, we can inactivate and reclaim the inode.
 932  */
 933 STATIC void
 934 xfs_fs_destroy_inode(
 935         struct inode            *inode)
 936 {
 937         struct xfs_inode        *ip = XFS_I(inode);
 938
 939         trace_xfs_destroy_inode(ip);
 940
 941         ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
 942         XFS_STATS_INC(ip->i_mount, vn_rele);
 943         XFS_STATS_INC(ip->i_mount, vn_remove);
 944
 945         xfs_inactive(ip);
 946
 947         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
 948         XFS_STATS_INC(ip->i_mount, vn_reclaim);
 949
 950         /*
 951          * We should never get here with one of the reclaim flags already set.
 952          */
 953         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
 954         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
 955
 956         /*
 957          * We always use background reclaim here because even if the
 958          * inode is clean, it still may be under IO and hence we have
 959          * to take the flush lock. The background reclaim path handles
 960          * this more efficiently than we can here, so simply let background
 961          * reclaim tear down all inodes.
 962          */
 963         xfs_inode_set_reclaim_tag(ip);
 964 }
 965
 966 /*
 967  * Slab object creation initialisation for the XFS inode.
 968  * This covers only the idempotent fields in the XFS inode;
 969  * all other fields need to be initialised on allocation
 970  * from the slab. This avoids the need to repeatedly initialise
 971  * fields in the xfs inode that left in the initialise state
 972  * when freeing the inode.
 973  */
 974 STATIC void
 975 xfs_fs_inode_init_once(
 976         void                    *inode)
 977 {
 978         struct xfs_inode        *ip = inode;
 979
 980         memset(ip, 0, sizeof(struct xfs_inode));
 981
 982         /* vfs inode */
 983         inode_init_once(VFS_I(ip));
 984
 985         /* xfs inode */
 986         atomic_set(&ip->i_pincount, 0);
 987         spin_lock_init(&ip->i_flags_lock);
 988
 989         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
 990                      "xfsino", ip->i_ino);
 991         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
 992                      "xfsino", ip->i_ino);
 993 }
 994
 995 /*
 996  * We do an unlocked check for XFS_IDONTCACHE here because we are already
 997  * serialised against cache hits here via the inode->i_lock and igrab() in
 998  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
 999  * racing with us, and it avoids needing to grab a spinlock here for every inode
1000  * we drop the final reference on.
1001  */
1002 STATIC int
1003 xfs_fs_drop_inode(
1004         struct inode            *inode)
1005 {
1006         struct xfs_inode        *ip = XFS_I(inode);
1007
1008         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1009 }
1010
1011 STATIC void
1012 xfs_free_fsname(
1013         struct xfs_mount        *mp)
1014 {
1015         kfree(mp->m_fsname);
1016         kfree(mp->m_rtname);
1017         kfree(mp->m_logname);
1018 }
1019
1020 STATIC int
1021 xfs_fs_sync_fs(
1022         struct super_block      *sb,
1023         int                     wait)
1024 {
1025         struct xfs_mount        *mp = XFS_M(sb);
1026
1027         /*
1028          * Doing anything during the async pass would be counterproductive.
1029          */
1030         if (!wait)
1031                 return 0;
1032
1033         xfs_log_force(mp, XFS_LOG_SYNC);
1034         if (laptop_mode) {
1035                 /*
1036                  * The disk must be active because we're syncing.
1037                  * We schedule log work now (now that the disk is
1038                  * active) instead of later (when it might not be).
1039                  */
1040                 flush_delayed_work(&mp->m_log->l_work);
1041         }
1042
1043         return 0;
1044 }
1045
1046 STATIC int
1047 xfs_fs_statfs(
1048         struct dentry           *dentry,
1049         struct kstatfs          *statp)
1050 {
1051         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1052         xfs_sb_t                *sbp = &mp->m_sb;
1053         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
1054         __uint64_t              fakeinos, id;
1055         __uint64_t              icount;
1056         __uint64_t              ifree;
1057         __uint64_t              fdblocks;
1058         xfs_extlen_t            lsize;
1059         __int64_t               ffree;
1060
1061         statp->f_type = XFS_SB_MAGIC;
1062         statp->f_namelen = MAXNAMELEN - 1;
1063
1064         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1065         statp->f_fsid.val[0] = (u32)id;
1066         statp->f_fsid.val[1] = (u32)(id >> 32);
1067
1068         icount = percpu_counter_sum(&mp->m_icount);
1069         ifree = percpu_counter_sum(&mp->m_ifree);
1070         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1071
1072         spin_lock(&mp->m_sb_lock);
1073         statp->f_bsize = sbp->sb_blocksize;
1074         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1075         statp->f_blocks = sbp->sb_dblocks - lsize;
1076         spin_unlock(&mp->m_sb_lock);
1077
1078         statp->f_bfree = fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1079         statp->f_bavail = statp->f_bfree;
1080
1081         fakeinos = statp->f_bfree << sbp->sb_inopblog;
1082         statp->f_files = MIN(icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1083         if (mp->m_maxicount)
1084                 statp->f_files = min_t(typeof(statp->f_files),
1085                                         statp->f_files,
1086                                         mp->m_maxicount);
1087
1088         /* If sb_icount overshot maxicount, report actual allocation */
1089         statp->f_files = max_t(typeof(statp->f_files),
1090                                         statp->f_files,
1091                                         sbp->sb_icount);
1092
1093         /* make sure statp->f_ffree does not underflow */
1094         ffree = statp->f_files - (icount - ifree);
1095         statp->f_ffree = max_t(__int64_t, ffree, 0);
1096
1097
1098         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1099             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1100                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1101                 xfs_qm_statvfs(ip, statp);
1102         return 0;
1103 }
1104
1105 STATIC void
1106 xfs_save_resvblks(struct xfs_mount *mp)
1107 {
1108         __uint64_t resblks = 0;
1109
1110         mp->m_resblks_save = mp->m_resblks;
1111         xfs_reserve_blocks(mp, &resblks, NULL);
1112 }
1113
1114 STATIC void
1115 xfs_restore_resvblks(struct xfs_mount *mp)
1116 {
1117         __uint64_t resblks;
1118
1119         if (mp->m_resblks_save) {
1120                 resblks = mp->m_resblks_save;
1121                 mp->m_resblks_save = 0;
1122         } else
1123                 resblks = xfs_default_resblks(mp);
1124
1125         xfs_reserve_blocks(mp, &resblks, NULL);
1126 }
1127
1128 /*
1129  * Trigger writeback of all the dirty metadata in the file system.
1130  *
1131  * This ensures that the metadata is written to their location on disk rather
1132  * than just existing in transactions in the log. This means after a quiesce
1133  * there is no log replay required to write the inodes to disk - this is the
1134  * primary difference between a sync and a quiesce.
1135  *
1136  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1137  * it is started again when appropriate.
1138  */
1139 static void
1140 xfs_quiesce_attr(
1141         struct xfs_mount        *mp)
1142 {
1143         int     error = 0;
1144
1145         /* wait for all modifications to complete */
1146         while (atomic_read(&mp->m_active_trans) > 0)
1147                 delay(100);
1148
1149         /* force the log to unpin objects from the now complete transactions */
1150         xfs_log_force(mp, XFS_LOG_SYNC);
1151
1152         /* reclaim inodes to do any IO before the freeze completes */
1153         xfs_reclaim_inodes(mp, 0);
1154         xfs_reclaim_inodes(mp, SYNC_WAIT);
1155
1156         /* Push the superblock and write an unmount record */
1157         error = xfs_log_sbcount(mp);
1158         if (error)
1159                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1160                                 "Frozen image may not be consistent.");
1161         /*
1162          * Just warn here till VFS can correctly support
1163          * read-only remount without racing.
1164          */
1165         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1166
1167         xfs_log_quiesce(mp);
1168 }
1169
1170 STATIC int
1171 xfs_test_remount_options(
1172         struct super_block      *sb,
1173         struct xfs_mount        *mp,
1174         char                    *options)
1175 {
1176         int                     error = 0;
1177         struct xfs_mount        *tmp_mp;
1178
1179         tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL);
1180         if (!tmp_mp)
1181                 return -ENOMEM;
1182
1183         tmp_mp->m_super = sb;
1184         error = xfs_parseargs(tmp_mp, options);
1185         xfs_free_fsname(tmp_mp);
1186         kfree(tmp_mp);
1187
1188         return error;
1189 }
1190
1191 STATIC int
1192 xfs_fs_remount(
1193         struct super_block      *sb,
1194         int                     *flags,
1195         char                    *options)
1196 {
1197         struct xfs_mount        *mp = XFS_M(sb);
1198         xfs_sb_t                *sbp = &mp->m_sb;
1199         substring_t             args[MAX_OPT_ARGS];
1200         char                    *p;
1201         int                     error;
1202
1203         /* First, check for complete junk; i.e. invalid options */
1204         error = xfs_test_remount_options(sb, mp, options);
1205         if (error)
1206                 return error;
1207
1208         sync_filesystem(sb);
1209         while ((p = strsep(&options, ",")) != NULL) {
1210                 int token;
1211
1212                 if (!*p)
1213                         continue;
1214
1215                 token = match_token(p, tokens, args);
1216                 switch (token) {
1217                 case Opt_barrier:
1218                         mp->m_flags |= XFS_MOUNT_BARRIER;
1219                         break;
1220                 case Opt_nobarrier:
1221                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
1222                         break;
1223                 case Opt_inode64:
1224                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1225                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1226                         break;
1227                 case Opt_inode32:
1228                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1229                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1230                         break;
1231                 default:
1232                         /*
1233                          * Logically we would return an error here to prevent
1234                          * users from believing they might have changed
1235                          * mount options using remount which can't be changed.
1236                          *
1237                          * But unfortunately mount(8) adds all options from
1238                          * mtab and fstab to the mount arguments in some cases
1239                          * so we can't blindly reject options, but have to
1240                          * check for each specified option if it actually
1241                          * differs from the currently set option and only
1242                          * reject it if that's the case.
1243                          *
1244                          * Until that is implemented we return success for
1245                          * every remount request, and silently ignore all
1246                          * options that we can't actually change.
1247                          */
1248 #if 0
1249                         xfs_info(mp,
1250                 "mount option \"%s\" not supported for remount", p);
1251                         return -EINVAL;
1252 #else
1253                         break;
1254 #endif
1255                 }
1256         }
1257
1258         /* ro -> rw */
1259         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1260                 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1261                         xfs_warn(mp,
1262                 "ro->rw transition prohibited on norecovery mount");
1263                         return -EINVAL;
1264                 }
1265
1266                 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1267                     xfs_sb_has_ro_compat_feature(sbp,
1268                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1269                         xfs_warn(mp,
1270 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1271                                 (sbp->sb_features_ro_compat &
1272                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1273                         return -EINVAL;
1274                 }
1275
1276                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1277
1278                 /*
1279                  * If this is the first remount to writeable state we
1280                  * might have some superblock changes to update.
1281                  */
1282                 if (mp->m_update_sb) {
1283                         error = xfs_sync_sb(mp, false);
1284                         if (error) {
1285                                 xfs_warn(mp, "failed to write sb changes");
1286                                 return error;
1287                         }
1288                         mp->m_update_sb = false;
1289                 }
1290
1291                 /*
1292                  * Fill out the reserve pool if it is empty. Use the stashed
1293                  * value if it is non-zero, otherwise go with the default.
1294                  */
1295                 xfs_restore_resvblks(mp);
1296                 xfs_log_work_queue(mp);
1297                 xfs_queue_eofblocks(mp);
1298         }
1299
1300         /* rw -> ro */
1301         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1302                 /*
1303                  * Before we sync the metadata, we need to free up the reserve
1304                  * block pool so that the used block count in the superblock on
1305                  * disk is correct at the end of the remount. Stash the current
1306                  * reserve pool size so that if we get remounted rw, we can
1307                  * return it to the same size.
1308                  */
1309                 xfs_save_resvblks(mp);
1310
1311                 /*
1312                  * Cancel background eofb scanning so it cannot race with the
1313                  * final log force+buftarg wait and deadlock the remount.
1314                  */
1315                 cancel_delayed_work_sync(&mp->m_eofblocks_work);
1316
1317                 xfs_quiesce_attr(mp);
1318                 mp->m_flags |= XFS_MOUNT_RDONLY;
1319         }
1320
1321         return 0;
1322 }
1323
1324 /*
1325  * Second stage of a freeze. The data is already frozen so we only
1326  * need to take care of the metadata. Once that's done sync the superblock
1327  * to the log to dirty it in case of a crash while frozen. This ensures that we
1328  * will recover the unlinked inode lists on the next mount.
1329  */
1330 STATIC int
1331 xfs_fs_freeze(
1332         struct super_block      *sb)
1333 {
1334         struct xfs_mount        *mp = XFS_M(sb);
1335
1336         xfs_save_resvblks(mp);
1337         xfs_quiesce_attr(mp);
1338         return xfs_sync_sb(mp, true);
1339 }
1340
1341 STATIC int
1342 xfs_fs_unfreeze(
1343         struct super_block      *sb)
1344 {
1345         struct xfs_mount        *mp = XFS_M(sb);
1346
1347         xfs_restore_resvblks(mp);
1348         xfs_log_work_queue(mp);
1349         return 0;
1350 }
1351
1352 STATIC int
1353 xfs_fs_show_options(
1354         struct seq_file         *m,
1355         struct dentry           *root)
1356 {
1357         return xfs_showargs(XFS_M(root->d_sb), m);
1358 }
1359
1360 /*
1361  * This function fills in xfs_mount_t fields based on mount args.
1362  * Note: the superblock _has_ now been read in.
1363  */
1364 STATIC int
1365 xfs_finish_flags(
1366         struct xfs_mount        *mp)
1367 {
1368         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1369
1370         /* Fail a mount where the logbuf is smaller than the log stripe */
1371         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1372                 if (mp->m_logbsize <= 0 &&
1373                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1374                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1375                 } else if (mp->m_logbsize > 0 &&
1376                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1377                         xfs_warn(mp,
1378                 "logbuf size must be greater than or equal to log stripe size");
1379                         return -EINVAL;
1380                 }
1381         } else {
1382                 /* Fail a mount if the logbuf is larger than 32K */
1383                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1384                         xfs_warn(mp,
1385                 "logbuf size for version 1 logs must be 16K or 32K");
1386                         return -EINVAL;
1387                 }
1388         }
1389
1390         /*
1391          * V5 filesystems always use attr2 format for attributes.
1392          */
1393         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1394             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1395                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
1396                              "attr2 is always enabled for V5 filesystems.");
1397                 return -EINVAL;
1398         }
1399
1400         /*
1401          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1402          * told by noattr2 to turn it off
1403          */
1404         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1405             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1406                 mp->m_flags |= XFS_MOUNT_ATTR2;
1407
1408         /*
1409          * prohibit r/w mounts of read-only filesystems
1410          */
1411         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1412                 xfs_warn(mp,
1413                         "cannot mount a read-only filesystem as read-write");
1414                 return -EROFS;
1415         }
1416
1417         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1418             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1419             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1420                 xfs_warn(mp,
1421                   "Super block does not support project and group quota together");
1422                 return -EINVAL;
1423         }
1424
1425         return 0;
1426 }
1427
1428 static int
1429 xfs_init_percpu_counters(
1430         struct xfs_mount        *mp)
1431 {
1432         int             error;
1433
1434         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1435         if (error)
1436                 return -ENOMEM;
1437
1438         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1439         if (error)
1440                 goto free_icount;
1441
1442         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1443         if (error)
1444                 goto free_ifree;
1445
1446         return 0;
1447
1448 free_ifree:
1449         percpu_counter_destroy(&mp->m_ifree);
1450 free_icount:
1451         percpu_counter_destroy(&mp->m_icount);
1452         return -ENOMEM;
1453 }
1454
1455 void
1456 xfs_reinit_percpu_counters(
1457         struct xfs_mount        *mp)
1458 {
1459         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1460         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1461         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1462 }
1463
1464 static void
1465 xfs_destroy_percpu_counters(
1466         struct xfs_mount        *mp)
1467 {
1468         percpu_counter_destroy(&mp->m_icount);
1469         percpu_counter_destroy(&mp->m_ifree);
1470         percpu_counter_destroy(&mp->m_fdblocks);
1471 }
1472
1473 STATIC int
1474 xfs_fs_fill_super(
1475         struct super_block      *sb,
1476         void                    *data,
1477         int                     silent)
1478 {
1479         struct inode            *root;
1480         struct xfs_mount        *mp = NULL;
1481         int                     flags = 0, error = -ENOMEM;
1482
1483         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1484         if (!mp)
1485                 goto out;
1486
1487         spin_lock_init(&mp->m_sb_lock);
1488         mutex_init(&mp->m_growlock);
1489         atomic_set(&mp->m_active_trans, 0);
1490         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1491         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1492         mp->m_kobj.kobject.kset = xfs_kset;
1493
1494         mp->m_super = sb;
1495         sb->s_fs_info = mp;
1496
1497         error = xfs_parseargs(mp, (char *)data);
1498         if (error)
1499                 goto out_free_fsname;
1500
1501         sb_min_blocksize(sb, BBSIZE);
1502         sb->s_xattr = xfs_xattr_handlers;
1503         sb->s_export_op = &xfs_export_operations;
1504 #ifdef CONFIG_XFS_QUOTA
1505         sb->s_qcop = &xfs_quotactl_operations;
1506         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1507 #endif
1508         sb->s_op = &xfs_super_operations;
1509
1510         if (silent)
1511                 flags |= XFS_MFSI_QUIET;
1512
1513         error = xfs_open_devices(mp);
1514         if (error)
1515                 goto out_free_fsname;
1516
1517         error = xfs_init_mount_workqueues(mp);
1518         if (error)
1519                 goto out_close_devices;
1520
1521         error = xfs_init_percpu_counters(mp);
1522         if (error)
1523                 goto out_destroy_workqueues;
1524
1525         /* Allocate stats memory before we do operations that might use it */
1526         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1527         if (!mp->m_stats.xs_stats) {
1528                 error = -ENOMEM;
1529                 goto out_destroy_counters;
1530         }
1531
1532         error = xfs_readsb(mp, flags);
1533         if (error)
1534                 goto out_free_stats;
1535
1536         error = xfs_finish_flags(mp);
1537         if (error)
1538                 goto out_free_sb;
1539
1540         error = xfs_setup_devices(mp);
1541         if (error)
1542                 goto out_free_sb;
1543
1544         error = xfs_filestream_mount(mp);
1545         if (error)
1546                 goto out_free_sb;
1547
1548         /*
1549          * we must configure the block size in the superblock before we run the
1550          * full mount process as the mount process can lookup and cache inodes.
1551          */
1552         sb->s_magic = XFS_SB_MAGIC;
1553         sb->s_blocksize = mp->m_sb.sb_blocksize;
1554         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1555         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1556         sb->s_max_links = XFS_MAXLINK;
1557         sb->s_time_gran = 1;
1558         set_posix_acl_flag(sb);
1559
1560         /* version 5 superblocks support inode version counters. */
1561         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1562                 sb->s_flags |= MS_I_VERSION;
1563
1564         if (mp->m_flags & XFS_MOUNT_DAX) {
1565                 xfs_warn(mp,
1566                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1567
1568                 error = bdev_dax_supported(sb, sb->s_blocksize);
1569                 if (error) {
1570                         xfs_alert(mp,
1571                         "DAX unsupported by block device. Turning off DAX.");
1572                         mp->m_flags &= ~XFS_MOUNT_DAX;
1573                 }
1574         }
1575
1576         error = xfs_mountfs(mp);
1577         if (error)
1578                 goto out_filestream_unmount;
1579
1580         root = igrab(VFS_I(mp->m_rootip));
1581         if (!root) {
1582                 error = -ENOENT;
1583                 goto out_unmount;
1584         }
1585         sb->s_root = d_make_root(root);
1586         if (!sb->s_root) {
1587                 error = -ENOMEM;
1588                 goto out_unmount;
1589         }
1590
1591         return 0;
1592
1593  out_filestream_unmount:
1594         xfs_filestream_unmount(mp);
1595  out_free_sb:
1596         xfs_freesb(mp);
1597  out_free_stats:
1598         free_percpu(mp->m_stats.xs_stats);
1599  out_destroy_counters:
1600         xfs_destroy_percpu_counters(mp);
1601  out_destroy_workqueues:
1602         xfs_destroy_mount_workqueues(mp);
1603  out_close_devices:
1604         xfs_close_devices(mp);
1605  out_free_fsname:
1606         xfs_free_fsname(mp);
1607         kfree(mp);
1608  out:
1609         return error;
1610
1611  out_unmount:
1612         xfs_filestream_unmount(mp);
1613         xfs_unmountfs(mp);
1614         goto out_free_sb;
1615 }
1616
1617 STATIC void
1618 xfs_fs_put_super(
1619         struct super_block      *sb)
1620 {
1621         struct xfs_mount        *mp = XFS_M(sb);
1622
1623         xfs_notice(mp, "Unmounting Filesystem");
1624         xfs_filestream_unmount(mp);
1625         xfs_unmountfs(mp);
1626
1627         xfs_freesb(mp);
1628         free_percpu(mp->m_stats.xs_stats);
1629         xfs_destroy_percpu_counters(mp);
1630         xfs_destroy_mount_workqueues(mp);
1631         xfs_close_devices(mp);
1632         xfs_free_fsname(mp);
1633         kfree(mp);
1634 }
1635
1636 STATIC struct dentry *
1637 xfs_fs_mount(
1638         struct file_system_type *fs_type,
1639         int                     flags,
1640         const char              *dev_name,
1641         void                    *data)
1642 {
1643         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1644 }
1645
1646 static long
1647 xfs_fs_nr_cached_objects(
1648         struct super_block      *sb,
1649         struct shrink_control   *sc)
1650 {
1651         return xfs_reclaim_inodes_count(XFS_M(sb));
1652 }
1653
1654 static long
1655 xfs_fs_free_cached_objects(
1656         struct super_block      *sb,
1657         struct shrink_control   *sc)
1658 {
1659         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1660 }
1661
1662 static const struct super_operations xfs_super_operations = {
1663         .alloc_inode            = xfs_fs_alloc_inode,
1664         .destroy_inode          = xfs_fs_destroy_inode,
1665         .drop_inode             = xfs_fs_drop_inode,
1666         .put_super              = xfs_fs_put_super,
1667         .sync_fs                = xfs_fs_sync_fs,
1668         .freeze_fs              = xfs_fs_freeze,
1669         .unfreeze_fs            = xfs_fs_unfreeze,
1670         .statfs                 = xfs_fs_statfs,
1671         .remount_fs             = xfs_fs_remount,
1672         .show_options           = xfs_fs_show_options,
1673         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1674         .free_cached_objects    = xfs_fs_free_cached_objects,
1675 };
1676
1677 static struct file_system_type xfs_fs_type = {
1678         .owner                  = THIS_MODULE,
1679         .name                   = "xfs",
1680         .mount                  = xfs_fs_mount,
1681         .kill_sb                = kill_block_super,
1682         .fs_flags               = FS_REQUIRES_DEV,
1683 };
1684 MODULE_ALIAS_FS("xfs");
1685
1686 STATIC int __init
1687 xfs_init_zones(void)
1688 {
1689         xfs_ioend_bioset = bioset_create(4 * MAX_BUF_PER_PAGE,
1690                         offsetof(struct xfs_ioend, io_inline_bio));
1691         if (!xfs_ioend_bioset)
1692                 goto out;
1693
1694         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1695                                                 "xfs_log_ticket");
1696         if (!xfs_log_ticket_zone)
1697                 goto out_free_ioend_bioset;
1698
1699         xfs_bmap_free_item_zone = kmem_zone_init(
1700                         sizeof(struct xfs_bmap_free_item),
1701                         "xfs_bmap_free_item");
1702         if (!xfs_bmap_free_item_zone)
1703                 goto out_destroy_log_ticket_zone;
1704
1705         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1706                                                 "xfs_btree_cur");
1707         if (!xfs_btree_cur_zone)
1708                 goto out_destroy_bmap_free_item_zone;
1709
1710         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1711                                                 "xfs_da_state");
1712         if (!xfs_da_state_zone)
1713                 goto out_destroy_btree_cur_zone;
1714
1715         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1716         if (!xfs_ifork_zone)
1717                 goto out_destroy_da_state_zone;
1718
1719         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1720         if (!xfs_trans_zone)
1721                 goto out_destroy_ifork_zone;
1722
1723         xfs_log_item_desc_zone =
1724                 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1725                                "xfs_log_item_desc");
1726         if (!xfs_log_item_desc_zone)
1727                 goto out_destroy_trans_zone;
1728
1729         /*
1730          * The size of the zone allocated buf log item is the maximum
1731          * size possible under XFS.  This wastes a little bit of memory,
1732          * but it is much faster.
1733          */
1734         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1735                                            "xfs_buf_item");
1736         if (!xfs_buf_item_zone)
1737                 goto out_destroy_log_item_desc_zone;
1738
1739         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1740                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1741                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1742         if (!xfs_efd_zone)
1743                 goto out_destroy_buf_item_zone;
1744
1745         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1746                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1747                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1748         if (!xfs_efi_zone)
1749                 goto out_destroy_efd_zone;
1750
1751         xfs_inode_zone =
1752                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1753                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD |
1754                         KM_ZONE_ACCOUNT, xfs_fs_inode_init_once);
1755         if (!xfs_inode_zone)
1756                 goto out_destroy_efi_zone;
1757
1758         xfs_ili_zone =
1759                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1760                                         KM_ZONE_SPREAD, NULL);
1761         if (!xfs_ili_zone)
1762                 goto out_destroy_inode_zone;
1763         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1764                                         "xfs_icr");
1765         if (!xfs_icreate_zone)
1766                 goto out_destroy_ili_zone;
1767
1768         return 0;
1769
1770  out_destroy_ili_zone:
1771         kmem_zone_destroy(xfs_ili_zone);
1772  out_destroy_inode_zone:
1773         kmem_zone_destroy(xfs_inode_zone);
1774  out_destroy_efi_zone:
1775         kmem_zone_destroy(xfs_efi_zone);
1776  out_destroy_efd_zone:
1777         kmem_zone_destroy(xfs_efd_zone);
1778  out_destroy_buf_item_zone:
1779         kmem_zone_destroy(xfs_buf_item_zone);
1780  out_destroy_log_item_desc_zone:
1781         kmem_zone_destroy(xfs_log_item_desc_zone);
1782  out_destroy_trans_zone:
1783         kmem_zone_destroy(xfs_trans_zone);
1784  out_destroy_ifork_zone:
1785         kmem_zone_destroy(xfs_ifork_zone);
1786  out_destroy_da_state_zone:
1787         kmem_zone_destroy(xfs_da_state_zone);
1788  out_destroy_btree_cur_zone:
1789         kmem_zone_destroy(xfs_btree_cur_zone);
1790  out_destroy_bmap_free_item_zone:
1791         kmem_zone_destroy(xfs_bmap_free_item_zone);
1792  out_destroy_log_ticket_zone:
1793         kmem_zone_destroy(xfs_log_ticket_zone);
1794  out_free_ioend_bioset:
1795         bioset_free(xfs_ioend_bioset);
1796  out:
1797         return -ENOMEM;
1798 }
1799
1800 STATIC void
1801 xfs_destroy_zones(void)
1802 {
1803         /*
1804          * Make sure all delayed rcu free are flushed before we
1805          * destroy caches.
1806          */
1807         rcu_barrier();
1808         kmem_zone_destroy(xfs_icreate_zone);
1809         kmem_zone_destroy(xfs_ili_zone);
1810         kmem_zone_destroy(xfs_inode_zone);
1811         kmem_zone_destroy(xfs_efi_zone);
1812         kmem_zone_destroy(xfs_efd_zone);
1813         kmem_zone_destroy(xfs_buf_item_zone);
1814         kmem_zone_destroy(xfs_log_item_desc_zone);
1815         kmem_zone_destroy(xfs_trans_zone);
1816         kmem_zone_destroy(xfs_ifork_zone);
1817         kmem_zone_destroy(xfs_da_state_zone);
1818         kmem_zone_destroy(xfs_btree_cur_zone);
1819         kmem_zone_destroy(xfs_bmap_free_item_zone);
1820         kmem_zone_destroy(xfs_log_ticket_zone);
1821         bioset_free(xfs_ioend_bioset);
1822 }
1823
1824 STATIC int __init
1825 xfs_init_workqueues(void)
1826 {
1827         /*
1828          * The allocation workqueue can be used in memory reclaim situations
1829          * (writepage path), and parallelism is only limited by the number of
1830          * AGs in all the filesystems mounted. Hence use the default large
1831          * max_active value for this workqueue.
1832          */
1833         xfs_alloc_wq = alloc_workqueue("xfsalloc",
1834                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
1835         if (!xfs_alloc_wq)
1836                 return -ENOMEM;
1837
1838         return 0;
1839 }
1840
1841 STATIC void
1842 xfs_destroy_workqueues(void)
1843 {
1844         destroy_workqueue(xfs_alloc_wq);
1845 }
1846
1847 STATIC int __init
1848 init_xfs_fs(void)
1849 {
1850         int                     error;
1851
1852         xfs_check_ondisk_structs();
1853
1854         printk(KERN_INFO XFS_VERSION_STRING " with "
1855                          XFS_BUILD_OPTIONS " enabled\n");
1856
1857         xfs_dir_startup();
1858
1859         error = xfs_init_zones();
1860         if (error)
1861                 goto out;
1862
1863         error = xfs_init_workqueues();
1864         if (error)
1865                 goto out_destroy_zones;
1866
1867         error = xfs_mru_cache_init();
1868         if (error)
1869                 goto out_destroy_wq;
1870
1871         error = xfs_buf_init();
1872         if (error)
1873                 goto out_mru_cache_uninit;
1874
1875         error = xfs_init_procfs();
1876         if (error)
1877                 goto out_buf_terminate;
1878
1879         error = xfs_sysctl_register();
1880         if (error)
1881                 goto out_cleanup_procfs;
1882
1883         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
1884         if (!xfs_kset) {
1885                 error = -ENOMEM;
1886                 goto out_sysctl_unregister;
1887         }
1888
1889         xfsstats.xs_kobj.kobject.kset = xfs_kset;
1890
1891         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
1892         if (!xfsstats.xs_stats) {
1893                 error = -ENOMEM;
1894                 goto out_kset_unregister;
1895         }
1896
1897         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
1898                                "stats");
1899         if (error)
1900                 goto out_free_stats;
1901
1902 #ifdef DEBUG
1903         xfs_dbg_kobj.kobject.kset = xfs_kset;
1904         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
1905         if (error)
1906                 goto out_remove_stats_kobj;
1907 #endif
1908
1909         error = xfs_qm_init();
1910         if (error)
1911                 goto out_remove_dbg_kobj;
1912
1913         error = register_filesystem(&xfs_fs_type);
1914         if (error)
1915                 goto out_qm_exit;
1916         return 0;
1917
1918  out_qm_exit:
1919         xfs_qm_exit();
1920  out_remove_dbg_kobj:
1921 #ifdef DEBUG
1922         xfs_sysfs_del(&xfs_dbg_kobj);
1923  out_remove_stats_kobj:
1924 #endif
1925         xfs_sysfs_del(&xfsstats.xs_kobj);
1926  out_free_stats:
1927         free_percpu(xfsstats.xs_stats);
1928  out_kset_unregister:
1929         kset_unregister(xfs_kset);
1930  out_sysctl_unregister:
1931         xfs_sysctl_unregister();
1932  out_cleanup_procfs:
1933         xfs_cleanup_procfs();
1934  out_buf_terminate:
1935         xfs_buf_terminate();
1936  out_mru_cache_uninit:
1937         xfs_mru_cache_uninit();
1938  out_destroy_wq:
1939         xfs_destroy_workqueues();
1940  out_destroy_zones:
1941         xfs_destroy_zones();
1942  out:
1943         return error;
1944 }
1945
1946 STATIC void __exit
1947 exit_xfs_fs(void)
1948 {
1949         xfs_qm_exit();
1950         unregister_filesystem(&xfs_fs_type);
1951 #ifdef DEBUG
1952         xfs_sysfs_del(&xfs_dbg_kobj);
1953 #endif
1954         xfs_sysfs_del(&xfsstats.xs_kobj);
1955         free_percpu(xfsstats.xs_stats);
1956         kset_unregister(xfs_kset);
1957         xfs_sysctl_unregister();
1958         xfs_cleanup_procfs();
1959         xfs_buf_terminate();
1960         xfs_mru_cache_uninit();
1961         xfs_destroy_workqueues();
1962         xfs_destroy_zones();
1963         xfs_uuid_table_free();
1964 }
1965
1966 module_init(init_xfs_fs);
1967 module_exit(exit_xfs_fs);
1968
1969 MODULE_AUTHOR("Silicon Graphics, Inc.");
1970 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
1971 MODULE_LICENSE("GPL");