fs/xfs/xfs_super.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6
   7 #include "xfs.h"
   8 #include "xfs_shared.h"
   9 #include "xfs_format.h"
  10 #include "xfs_log_format.h"
  11 #include "xfs_trans_resv.h"
  12 #include "xfs_sb.h"
  13 #include "xfs_mount.h"
  14 #include "xfs_inode.h"
  15 #include "xfs_btree.h"
  16 #include "xfs_bmap.h"
  17 #include "xfs_alloc.h"
  18 #include "xfs_fsops.h"
  19 #include "xfs_trans.h"
  20 #include "xfs_buf_item.h"
  21 #include "xfs_log.h"
  22 #include "xfs_log_priv.h"
  23 #include "xfs_dir2.h"
  24 #include "xfs_extfree_item.h"
  25 #include "xfs_mru_cache.h"
  26 #include "xfs_inode_item.h"
  27 #include "xfs_icache.h"
  28 #include "xfs_trace.h"
  29 #include "xfs_icreate_item.h"
  30 #include "xfs_filestream.h"
  31 #include "xfs_quota.h"
  32 #include "xfs_sysfs.h"
  33 #include "xfs_ondisk.h"
  34 #include "xfs_rmap_item.h"
  35 #include "xfs_refcount_item.h"
  36 #include "xfs_bmap_item.h"
  37 #include "xfs_reflink.h"
  38 #include "xfs_pwork.h"
  39 #include "xfs_ag.h"
  40 #include "xfs_defer.h"
  41 #include "xfs_attr_item.h"
  42 #include "xfs_xattr.h"
  43 #include "xfs_iunlink_item.h"
  44 #include "xfs_dahash_test.h"
  45
  46 #include <linux/magic.h>
  47 #include <linux/fs_context.h>
  48 #include <linux/fs_parser.h>
  49
  50 static const struct super_operations xfs_super_operations;
  51
  52 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
  53 #ifdef DEBUG
  54 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
  55 #endif
  56
  57 #ifdef CONFIG_HOTPLUG_CPU
  58 static LIST_HEAD(xfs_mount_list);
  59 static DEFINE_SPINLOCK(xfs_mount_list_lock);
  60
  61 static inline void xfs_mount_list_add(struct xfs_mount *mp)
  62 {
  63         spin_lock(&xfs_mount_list_lock);
  64         list_add(&mp->m_mount_list, &xfs_mount_list);
  65         spin_unlock(&xfs_mount_list_lock);
  66 }
  67
  68 static inline void xfs_mount_list_del(struct xfs_mount *mp)
  69 {
  70         spin_lock(&xfs_mount_list_lock);
  71         list_del(&mp->m_mount_list);
  72         spin_unlock(&xfs_mount_list_lock);
  73 }
  74 #else /* !CONFIG_HOTPLUG_CPU */
  75 static inline void xfs_mount_list_add(struct xfs_mount *mp) {}
  76 static inline void xfs_mount_list_del(struct xfs_mount *mp) {}
  77 #endif
  78
  79 enum xfs_dax_mode {
  80         XFS_DAX_INODE = 0,
  81         XFS_DAX_ALWAYS = 1,
  82         XFS_DAX_NEVER = 2,
  83 };
  84
  85 static void
  86 xfs_mount_set_dax_mode(
  87         struct xfs_mount        *mp,
  88         enum xfs_dax_mode       mode)
  89 {
  90         switch (mode) {
  91         case XFS_DAX_INODE:
  92                 mp->m_features &= ~(XFS_FEAT_DAX_ALWAYS | XFS_FEAT_DAX_NEVER);
  93                 break;
  94         case XFS_DAX_ALWAYS:
  95                 mp->m_features |= XFS_FEAT_DAX_ALWAYS;
  96                 mp->m_features &= ~XFS_FEAT_DAX_NEVER;
  97                 break;
  98         case XFS_DAX_NEVER:
  99                 mp->m_features |= XFS_FEAT_DAX_NEVER;
 100                 mp->m_features &= ~XFS_FEAT_DAX_ALWAYS;
 101                 break;
 102         }
 103 }
 104
 105 static const struct constant_table dax_param_enums[] = {
 106         {"inode",       XFS_DAX_INODE },
 107         {"always",      XFS_DAX_ALWAYS },
 108         {"never",       XFS_DAX_NEVER },
 109         {}
 110 };
 111
 112 /*
 113  * Table driven mount option parser.
 114  */
 115 enum {
 116         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev,
 117         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
 118         Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
 119         Opt_allocsize, Opt_norecovery, Opt_inode64, Opt_inode32, Opt_ikeep,
 120         Opt_noikeep, Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2,
 121         Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
 122         Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
 123         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
 124         Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum,
 125 };
 126
 127 static const struct fs_parameter_spec xfs_fs_parameters[] = {
 128         fsparam_u32("logbufs",          Opt_logbufs),
 129         fsparam_string("logbsize",      Opt_logbsize),
 130         fsparam_string("logdev",        Opt_logdev),
 131         fsparam_string("rtdev",         Opt_rtdev),
 132         fsparam_flag("wsync",           Opt_wsync),
 133         fsparam_flag("noalign",         Opt_noalign),
 134         fsparam_flag("swalloc",         Opt_swalloc),
 135         fsparam_u32("sunit",            Opt_sunit),
 136         fsparam_u32("swidth",           Opt_swidth),
 137         fsparam_flag("nouuid",          Opt_nouuid),
 138         fsparam_flag("grpid",           Opt_grpid),
 139         fsparam_flag("nogrpid",         Opt_nogrpid),
 140         fsparam_flag("bsdgroups",       Opt_bsdgroups),
 141         fsparam_flag("sysvgroups",      Opt_sysvgroups),
 142         fsparam_string("allocsize",     Opt_allocsize),
 143         fsparam_flag("norecovery",      Opt_norecovery),
 144         fsparam_flag("inode64",         Opt_inode64),
 145         fsparam_flag("inode32",         Opt_inode32),
 146         fsparam_flag("ikeep",           Opt_ikeep),
 147         fsparam_flag("noikeep",         Opt_noikeep),
 148         fsparam_flag("largeio",         Opt_largeio),
 149         fsparam_flag("nolargeio",       Opt_nolargeio),
 150         fsparam_flag("attr2",           Opt_attr2),
 151         fsparam_flag("noattr2",         Opt_noattr2),
 152         fsparam_flag("filestreams",     Opt_filestreams),
 153         fsparam_flag("quota",           Opt_quota),
 154         fsparam_flag("noquota",         Opt_noquota),
 155         fsparam_flag("usrquota",        Opt_usrquota),
 156         fsparam_flag("grpquota",        Opt_grpquota),
 157         fsparam_flag("prjquota",        Opt_prjquota),
 158         fsparam_flag("uquota",          Opt_uquota),
 159         fsparam_flag("gquota",          Opt_gquota),
 160         fsparam_flag("pquota",          Opt_pquota),
 161         fsparam_flag("uqnoenforce",     Opt_uqnoenforce),
 162         fsparam_flag("gqnoenforce",     Opt_gqnoenforce),
 163         fsparam_flag("pqnoenforce",     Opt_pqnoenforce),
 164         fsparam_flag("qnoenforce",      Opt_qnoenforce),
 165         fsparam_flag("discard",         Opt_discard),
 166         fsparam_flag("nodiscard",       Opt_nodiscard),
 167         fsparam_flag("dax",             Opt_dax),
 168         fsparam_enum("dax",             Opt_dax_enum, dax_param_enums),
 169         {}
 170 };
 171
 172 struct proc_xfs_info {
 173         uint64_t        flag;
 174         char            *str;
 175 };
 176
 177 static int
 178 xfs_fs_show_options(
 179         struct seq_file         *m,
 180         struct dentry           *root)
 181 {
 182         static struct proc_xfs_info xfs_info_set[] = {
 183                 /* the few simple ones we can get from the mount struct */
 184                 { XFS_FEAT_IKEEP,               ",ikeep" },
 185                 { XFS_FEAT_WSYNC,               ",wsync" },
 186                 { XFS_FEAT_NOALIGN,             ",noalign" },
 187                 { XFS_FEAT_SWALLOC,             ",swalloc" },
 188                 { XFS_FEAT_NOUUID,              ",nouuid" },
 189                 { XFS_FEAT_NORECOVERY,          ",norecovery" },
 190                 { XFS_FEAT_ATTR2,               ",attr2" },
 191                 { XFS_FEAT_FILESTREAMS,         ",filestreams" },
 192                 { XFS_FEAT_GRPID,               ",grpid" },
 193                 { XFS_FEAT_DISCARD,             ",discard" },
 194                 { XFS_FEAT_LARGE_IOSIZE,        ",largeio" },
 195                 { XFS_FEAT_DAX_ALWAYS,          ",dax=always" },
 196                 { XFS_FEAT_DAX_NEVER,           ",dax=never" },
 197                 { 0, NULL }
 198         };
 199         struct xfs_mount        *mp = XFS_M(root->d_sb);
 200         struct proc_xfs_info    *xfs_infop;
 201
 202         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
 203                 if (mp->m_features & xfs_infop->flag)
 204                         seq_puts(m, xfs_infop->str);
 205         }
 206
 207         seq_printf(m, ",inode%d", xfs_has_small_inums(mp) ? 32 : 64);
 208
 209         if (xfs_has_allocsize(mp))
 210                 seq_printf(m, ",allocsize=%dk",
 211                            (1 << mp->m_allocsize_log) >> 10);
 212
 213         if (mp->m_logbufs > 0)
 214                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
 215         if (mp->m_logbsize > 0)
 216                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
 217
 218         if (mp->m_logname)
 219                 seq_show_option(m, "logdev", mp->m_logname);
 220         if (mp->m_rtname)
 221                 seq_show_option(m, "rtdev", mp->m_rtname);
 222
 223         if (mp->m_dalign > 0)
 224                 seq_printf(m, ",sunit=%d",
 225                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
 226         if (mp->m_swidth > 0)
 227                 seq_printf(m, ",swidth=%d",
 228                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
 229
 230         if (mp->m_qflags & XFS_UQUOTA_ENFD)
 231                 seq_puts(m, ",usrquota");
 232         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
 233                 seq_puts(m, ",uqnoenforce");
 234
 235         if (mp->m_qflags & XFS_PQUOTA_ENFD)
 236                 seq_puts(m, ",prjquota");
 237         else if (mp->m_qflags & XFS_PQUOTA_ACCT)
 238                 seq_puts(m, ",pqnoenforce");
 239
 240         if (mp->m_qflags & XFS_GQUOTA_ENFD)
 241                 seq_puts(m, ",grpquota");
 242         else if (mp->m_qflags & XFS_GQUOTA_ACCT)
 243                 seq_puts(m, ",gqnoenforce");
 244
 245         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
 246                 seq_puts(m, ",noquota");
 247
 248         return 0;
 249 }
 250
 251 static bool
 252 xfs_set_inode_alloc_perag(
 253         struct xfs_perag        *pag,
 254         xfs_ino_t               ino,
 255         xfs_agnumber_t          max_metadata)
 256 {
 257         if (!xfs_is_inode32(pag->pag_mount)) {
 258                 set_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate);
 259                 clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
 260                 return false;
 261         }
 262
 263         if (ino > XFS_MAXINUMBER_32) {
 264                 clear_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate);
 265                 clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
 266                 return false;
 267         }
 268
 269         set_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate);
 270         if (pag->pag_agno < max_metadata)
 271                 set_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
 272         else
 273                 clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
 274         return true;
 275 }
 276
 277 /*
 278  * Set parameters for inode allocation heuristics, taking into account
 279  * filesystem size and inode32/inode64 mount options; i.e. specifically
 280  * whether or not XFS_FEAT_SMALL_INUMS is set.
 281  *
 282  * Inode allocation patterns are altered only if inode32 is requested
 283  * (XFS_FEAT_SMALL_INUMS), and the filesystem is sufficiently large.
 284  * If altered, XFS_OPSTATE_INODE32 is set as well.
 285  *
 286  * An agcount independent of that in the mount structure is provided
 287  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
 288  * to the potentially higher ag count.
 289  *
 290  * Returns the maximum AG index which may contain inodes.
 291  */
 292 xfs_agnumber_t
 293 xfs_set_inode_alloc(
 294         struct xfs_mount *mp,
 295         xfs_agnumber_t  agcount)
 296 {
 297         xfs_agnumber_t  index;
 298         xfs_agnumber_t  maxagi = 0;
 299         xfs_sb_t        *sbp = &mp->m_sb;
 300         xfs_agnumber_t  max_metadata;
 301         xfs_agino_t     agino;
 302         xfs_ino_t       ino;
 303
 304         /*
 305          * Calculate how much should be reserved for inodes to meet
 306          * the max inode percentage.  Used only for inode32.
 307          */
 308         if (M_IGEO(mp)->maxicount) {
 309                 uint64_t        icount;
 310
 311                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
 312                 do_div(icount, 100);
 313                 icount += sbp->sb_agblocks - 1;
 314                 do_div(icount, sbp->sb_agblocks);
 315                 max_metadata = icount;
 316         } else {
 317                 max_metadata = agcount;
 318         }
 319
 320         /* Get the last possible inode in the filesystem */
 321         agino = XFS_AGB_TO_AGINO(mp, sbp->sb_agblocks - 1);
 322         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
 323
 324         /*
 325          * If user asked for no more than 32-bit inodes, and the fs is
 326          * sufficiently large, set XFS_OPSTATE_INODE32 if we must alter
 327          * the allocator to accommodate the request.
 328          */
 329         if (xfs_has_small_inums(mp) && ino > XFS_MAXINUMBER_32)
 330                 set_bit(XFS_OPSTATE_INODE32, &mp->m_opstate);
 331         else
 332                 clear_bit(XFS_OPSTATE_INODE32, &mp->m_opstate);
 333
 334         for (index = 0; index < agcount; index++) {
 335                 struct xfs_perag        *pag;
 336
 337                 ino = XFS_AGINO_TO_INO(mp, index, agino);
 338
 339                 pag = xfs_perag_get(mp, index);
 340                 if (xfs_set_inode_alloc_perag(pag, ino, max_metadata))
 341                         maxagi++;
 342                 xfs_perag_put(pag);
 343         }
 344
 345         return xfs_is_inode32(mp) ? maxagi : agcount;
 346 }
 347
 348 static int
 349 xfs_setup_dax_always(
 350         struct xfs_mount        *mp)
 351 {
 352         if (!mp->m_ddev_targp->bt_daxdev &&
 353             (!mp->m_rtdev_targp || !mp->m_rtdev_targp->bt_daxdev)) {
 354                 xfs_alert(mp,
 355                         "DAX unsupported by block device. Turning off DAX.");
 356                 goto disable_dax;
 357         }
 358
 359         if (mp->m_super->s_blocksize != PAGE_SIZE) {
 360                 xfs_alert(mp,
 361                         "DAX not supported for blocksize. Turning off DAX.");
 362                 goto disable_dax;
 363         }
 364
 365         if (xfs_has_reflink(mp) &&
 366             bdev_is_partition(mp->m_ddev_targp->bt_bdev)) {
 367                 xfs_alert(mp,
 368                         "DAX and reflink cannot work with multi-partitions!");
 369                 return -EINVAL;
 370         }
 371
 372         xfs_warn(mp, "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
 373         return 0;
 374
 375 disable_dax:
 376         xfs_mount_set_dax_mode(mp, XFS_DAX_NEVER);
 377         return 0;
 378 }
 379
 380 STATIC int
 381 xfs_blkdev_get(
 382         xfs_mount_t             *mp,
 383         const char              *name,
 384         struct block_device     **bdevp)
 385 {
 386         int                     error = 0;
 387
 388         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
 389                                     mp);
 390         if (IS_ERR(*bdevp)) {
 391                 error = PTR_ERR(*bdevp);
 392                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
 393         }
 394
 395         return error;
 396 }
 397
 398 STATIC void
 399 xfs_blkdev_put(
 400         struct block_device     *bdev)
 401 {
 402         if (bdev)
 403                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 404 }
 405
 406 STATIC void
 407 xfs_close_devices(
 408         struct xfs_mount        *mp)
 409 {
 410         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 411                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
 412
 413                 xfs_free_buftarg(mp->m_logdev_targp);
 414                 xfs_blkdev_put(logdev);
 415         }
 416         if (mp->m_rtdev_targp) {
 417                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
 418
 419                 xfs_free_buftarg(mp->m_rtdev_targp);
 420                 xfs_blkdev_put(rtdev);
 421         }
 422         xfs_free_buftarg(mp->m_ddev_targp);
 423 }
 424
 425 /*
 426  * The file system configurations are:
 427  *      (1) device (partition) with data and internal log
 428  *      (2) logical volume with data and log subvolumes.
 429  *      (3) logical volume with data, log, and realtime subvolumes.
 430  *
 431  * We only have to handle opening the log and realtime volumes here if
 432  * they are present.  The data subvolume has already been opened by
 433  * get_sb_bdev() and is stored in sb->s_bdev.
 434  */
 435 STATIC int
 436 xfs_open_devices(
 437         struct xfs_mount        *mp)
 438 {
 439         struct block_device     *ddev = mp->m_super->s_bdev;
 440         struct block_device     *logdev = NULL, *rtdev = NULL;
 441         int                     error;
 442
 443         /*
 444          * Open real time and log devices - order is important.
 445          */
 446         if (mp->m_logname) {
 447                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
 448                 if (error)
 449                         return error;
 450         }
 451
 452         if (mp->m_rtname) {
 453                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
 454                 if (error)
 455                         goto out_close_logdev;
 456
 457                 if (rtdev == ddev || rtdev == logdev) {
 458                         xfs_warn(mp,
 459         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
 460                         error = -EINVAL;
 461                         goto out_close_rtdev;
 462                 }
 463         }
 464
 465         /*
 466          * Setup xfs_mount buffer target pointers
 467          */
 468         error = -ENOMEM;
 469         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev);
 470         if (!mp->m_ddev_targp)
 471                 goto out_close_rtdev;
 472
 473         if (rtdev) {
 474                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev);
 475                 if (!mp->m_rtdev_targp)
 476                         goto out_free_ddev_targ;
 477         }
 478
 479         if (logdev && logdev != ddev) {
 480                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
 481                 if (!mp->m_logdev_targp)
 482                         goto out_free_rtdev_targ;
 483         } else {
 484                 mp->m_logdev_targp = mp->m_ddev_targp;
 485         }
 486
 487         return 0;
 488
 489  out_free_rtdev_targ:
 490         if (mp->m_rtdev_targp)
 491                 xfs_free_buftarg(mp->m_rtdev_targp);
 492  out_free_ddev_targ:
 493         xfs_free_buftarg(mp->m_ddev_targp);
 494  out_close_rtdev:
 495         xfs_blkdev_put(rtdev);
 496  out_close_logdev:
 497         if (logdev && logdev != ddev)
 498                 xfs_blkdev_put(logdev);
 499         return error;
 500 }
 501
 502 /*
 503  * Setup xfs_mount buffer target pointers based on superblock
 504  */
 505 STATIC int
 506 xfs_setup_devices(
 507         struct xfs_mount        *mp)
 508 {
 509         int                     error;
 510
 511         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
 512         if (error)
 513                 return error;
 514
 515         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 516                 unsigned int    log_sector_size = BBSIZE;
 517
 518                 if (xfs_has_sector(mp))
 519                         log_sector_size = mp->m_sb.sb_logsectsize;
 520                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
 521                                             log_sector_size);
 522                 if (error)
 523                         return error;
 524         }
 525         if (mp->m_rtdev_targp) {
 526                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
 527                                             mp->m_sb.sb_sectsize);
 528                 if (error)
 529                         return error;
 530         }
 531
 532         return 0;
 533 }
 534
 535 STATIC int
 536 xfs_init_mount_workqueues(
 537         struct xfs_mount        *mp)
 538 {
 539         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
 540                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
 541                         1, mp->m_super->s_id);
 542         if (!mp->m_buf_workqueue)
 543                 goto out;
 544
 545         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
 546                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
 547                         0, mp->m_super->s_id);
 548         if (!mp->m_unwritten_workqueue)
 549                 goto out_destroy_buf;
 550
 551         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
 552                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
 553                         0, mp->m_super->s_id);
 554         if (!mp->m_reclaim_workqueue)
 555                 goto out_destroy_unwritten;
 556
 557         mp->m_blockgc_wq = alloc_workqueue("xfs-blockgc/%s",
 558                         XFS_WQFLAGS(WQ_UNBOUND | WQ_FREEZABLE | WQ_MEM_RECLAIM),
 559                         0, mp->m_super->s_id);
 560         if (!mp->m_blockgc_wq)
 561                 goto out_destroy_reclaim;
 562
 563         mp->m_inodegc_wq = alloc_workqueue("xfs-inodegc/%s",
 564                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
 565                         1, mp->m_super->s_id);
 566         if (!mp->m_inodegc_wq)
 567                 goto out_destroy_blockgc;
 568
 569         mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s",
 570                         XFS_WQFLAGS(WQ_FREEZABLE), 0, mp->m_super->s_id);
 571         if (!mp->m_sync_workqueue)
 572                 goto out_destroy_inodegc;
 573
 574         return 0;
 575
 576 out_destroy_inodegc:
 577         destroy_workqueue(mp->m_inodegc_wq);
 578 out_destroy_blockgc:
 579         destroy_workqueue(mp->m_blockgc_wq);
 580 out_destroy_reclaim:
 581         destroy_workqueue(mp->m_reclaim_workqueue);
 582 out_destroy_unwritten:
 583         destroy_workqueue(mp->m_unwritten_workqueue);
 584 out_destroy_buf:
 585         destroy_workqueue(mp->m_buf_workqueue);
 586 out:
 587         return -ENOMEM;
 588 }
 589
 590 STATIC void
 591 xfs_destroy_mount_workqueues(
 592         struct xfs_mount        *mp)
 593 {
 594         destroy_workqueue(mp->m_sync_workqueue);
 595         destroy_workqueue(mp->m_blockgc_wq);
 596         destroy_workqueue(mp->m_inodegc_wq);
 597         destroy_workqueue(mp->m_reclaim_workqueue);
 598         destroy_workqueue(mp->m_unwritten_workqueue);
 599         destroy_workqueue(mp->m_buf_workqueue);
 600 }
 601
 602 static void
 603 xfs_flush_inodes_worker(
 604         struct work_struct      *work)
 605 {
 606         struct xfs_mount        *mp = container_of(work, struct xfs_mount,
 607                                                    m_flush_inodes_work);
 608         struct super_block      *sb = mp->m_super;
 609
 610         if (down_read_trylock(&sb->s_umount)) {
 611                 sync_inodes_sb(sb);
 612                 up_read(&sb->s_umount);
 613         }
 614 }
 615
 616 /*
 617  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
 618  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
 619  * for IO to complete so that we effectively throttle multiple callers to the
 620  * rate at which IO is completing.
 621  */
 622 void
 623 xfs_flush_inodes(
 624         struct xfs_mount        *mp)
 625 {
 626         /*
 627          * If flush_work() returns true then that means we waited for a flush
 628          * which was already in progress.  Don't bother running another scan.
 629          */
 630         if (flush_work(&mp->m_flush_inodes_work))
 631                 return;
 632
 633         queue_work(mp->m_sync_workqueue, &mp->m_flush_inodes_work);
 634         flush_work(&mp->m_flush_inodes_work);
 635 }
 636
 637 /* Catch misguided souls that try to use this interface on XFS */
 638 STATIC struct inode *
 639 xfs_fs_alloc_inode(
 640         struct super_block      *sb)
 641 {
 642         BUG();
 643         return NULL;
 644 }
 645
 646 /*
 647  * Now that the generic code is guaranteed not to be accessing
 648  * the linux inode, we can inactivate and reclaim the inode.
 649  */
 650 STATIC void
 651 xfs_fs_destroy_inode(
 652         struct inode            *inode)
 653 {
 654         struct xfs_inode        *ip = XFS_I(inode);
 655
 656         trace_xfs_destroy_inode(ip);
 657
 658         ASSERT(!rwsem_is_locked(&inode->i_rwsem));
 659         XFS_STATS_INC(ip->i_mount, vn_rele);
 660         XFS_STATS_INC(ip->i_mount, vn_remove);
 661         xfs_inode_mark_reclaimable(ip);
 662 }
 663
 664 static void
 665 xfs_fs_dirty_inode(
 666         struct inode                    *inode,
 667         int                             flags)
 668 {
 669         struct xfs_inode                *ip = XFS_I(inode);
 670         struct xfs_mount                *mp = ip->i_mount;
 671         struct xfs_trans                *tp;
 672
 673         if (!(inode->i_sb->s_flags & SB_LAZYTIME))
 674                 return;
 675
 676         /*
 677          * Only do the timestamp update if the inode is dirty (I_DIRTY_SYNC)
 678          * and has dirty timestamp (I_DIRTY_TIME). I_DIRTY_TIME can be passed
 679          * in flags possibly together with I_DIRTY_SYNC.
 680          */
 681         if ((flags & ~I_DIRTY_TIME) != I_DIRTY_SYNC || !(flags & I_DIRTY_TIME))
 682                 return;
 683
 684         if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
 685                 return;
 686         xfs_ilock(ip, XFS_ILOCK_EXCL);
 687         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 688         xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
 689         xfs_trans_commit(tp);
 690 }
 691
 692 /*
 693  * Slab object creation initialisation for the XFS inode.
 694  * This covers only the idempotent fields in the XFS inode;
 695  * all other fields need to be initialised on allocation
 696  * from the slab. This avoids the need to repeatedly initialise
 697  * fields in the xfs inode that left in the initialise state
 698  * when freeing the inode.
 699  */
 700 STATIC void
 701 xfs_fs_inode_init_once(
 702         void                    *inode)
 703 {
 704         struct xfs_inode        *ip = inode;
 705
 706         memset(ip, 0, sizeof(struct xfs_inode));
 707
 708         /* vfs inode */
 709         inode_init_once(VFS_I(ip));
 710
 711         /* xfs inode */
 712         atomic_set(&ip->i_pincount, 0);
 713         spin_lock_init(&ip->i_flags_lock);
 714
 715         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
 716                      "xfsino", ip->i_ino);
 717 }
 718
 719 /*
 720  * We do an unlocked check for XFS_IDONTCACHE here because we are already
 721  * serialised against cache hits here via the inode->i_lock and igrab() in
 722  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
 723  * racing with us, and it avoids needing to grab a spinlock here for every inode
 724  * we drop the final reference on.
 725  */
 726 STATIC int
 727 xfs_fs_drop_inode(
 728         struct inode            *inode)
 729 {
 730         struct xfs_inode        *ip = XFS_I(inode);
 731
 732         /*
 733          * If this unlinked inode is in the middle of recovery, don't
 734          * drop the inode just yet; log recovery will take care of
 735          * that.  See the comment for this inode flag.
 736          */
 737         if (ip->i_flags & XFS_IRECOVERY) {
 738                 ASSERT(xlog_recovery_needed(ip->i_mount->m_log));
 739                 return 0;
 740         }
 741
 742         return generic_drop_inode(inode);
 743 }
 744
 745 static void
 746 xfs_mount_free(
 747         struct xfs_mount        *mp)
 748 {
 749         kfree(mp->m_rtname);
 750         kfree(mp->m_logname);
 751         kmem_free(mp);
 752 }
 753
 754 STATIC int
 755 xfs_fs_sync_fs(
 756         struct super_block      *sb,
 757         int                     wait)
 758 {
 759         struct xfs_mount        *mp = XFS_M(sb);
 760         int                     error;
 761
 762         trace_xfs_fs_sync_fs(mp, __return_address);
 763
 764         /*
 765          * Doing anything during the async pass would be counterproductive.
 766          */
 767         if (!wait)
 768                 return 0;
 769
 770         error = xfs_log_force(mp, XFS_LOG_SYNC);
 771         if (error)
 772                 return error;
 773
 774         if (laptop_mode) {
 775                 /*
 776                  * The disk must be active because we're syncing.
 777                  * We schedule log work now (now that the disk is
 778                  * active) instead of later (when it might not be).
 779                  */
 780                 flush_delayed_work(&mp->m_log->l_work);
 781         }
 782
 783         /*
 784          * If we are called with page faults frozen out, it means we are about
 785          * to freeze the transaction subsystem. Take the opportunity to shut
 786          * down inodegc because once SB_FREEZE_FS is set it's too late to
 787          * prevent inactivation races with freeze. The fs doesn't get called
 788          * again by the freezing process until after SB_FREEZE_FS has been set,
 789          * so it's now or never.  Same logic applies to speculative allocation
 790          * garbage collection.
 791          *
 792          * We don't care if this is a normal syncfs call that does this or
 793          * freeze that does this - we can run this multiple times without issue
 794          * and we won't race with a restart because a restart can only occur
 795          * when the state is either SB_FREEZE_FS or SB_FREEZE_COMPLETE.
 796          */
 797         if (sb->s_writers.frozen == SB_FREEZE_PAGEFAULT) {
 798                 xfs_inodegc_stop(mp);
 799                 xfs_blockgc_stop(mp);
 800         }
 801
 802         return 0;
 803 }
 804
 805 STATIC int
 806 xfs_fs_statfs(
 807         struct dentry           *dentry,
 808         struct kstatfs          *statp)
 809 {
 810         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
 811         xfs_sb_t                *sbp = &mp->m_sb;
 812         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
 813         uint64_t                fakeinos, id;
 814         uint64_t                icount;
 815         uint64_t                ifree;
 816         uint64_t                fdblocks;
 817         xfs_extlen_t            lsize;
 818         int64_t                 ffree;
 819
 820         /*
 821          * Expedite background inodegc but don't wait. We do not want to block
 822          * here waiting hours for a billion extent file to be truncated.
 823          */
 824         xfs_inodegc_push(mp);
 825
 826         statp->f_type = XFS_SUPER_MAGIC;
 827         statp->f_namelen = MAXNAMELEN - 1;
 828
 829         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
 830         statp->f_fsid = u64_to_fsid(id);
 831
 832         icount = percpu_counter_sum(&mp->m_icount);
 833         ifree = percpu_counter_sum(&mp->m_ifree);
 834         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
 835
 836         spin_lock(&mp->m_sb_lock);
 837         statp->f_bsize = sbp->sb_blocksize;
 838         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
 839         statp->f_blocks = sbp->sb_dblocks - lsize;
 840         spin_unlock(&mp->m_sb_lock);
 841
 842         /* make sure statp->f_bfree does not underflow */
 843         statp->f_bfree = max_t(int64_t, 0,
 844                                 fdblocks - xfs_fdblocks_unavailable(mp));
 845         statp->f_bavail = statp->f_bfree;
 846
 847         fakeinos = XFS_FSB_TO_INO(mp, statp->f_bfree);
 848         statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
 849         if (M_IGEO(mp)->maxicount)
 850                 statp->f_files = min_t(typeof(statp->f_files),
 851                                         statp->f_files,
 852                                         M_IGEO(mp)->maxicount);
 853
 854         /* If sb_icount overshot maxicount, report actual allocation */
 855         statp->f_files = max_t(typeof(statp->f_files),
 856                                         statp->f_files,
 857                                         sbp->sb_icount);
 858
 859         /* make sure statp->f_ffree does not underflow */
 860         ffree = statp->f_files - (icount - ifree);
 861         statp->f_ffree = max_t(int64_t, ffree, 0);
 862
 863
 864         if ((ip->i_diflags & XFS_DIFLAG_PROJINHERIT) &&
 865             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
 866                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
 867                 xfs_qm_statvfs(ip, statp);
 868
 869         if (XFS_IS_REALTIME_MOUNT(mp) &&
 870             (ip->i_diflags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
 871                 s64     freertx;
 872
 873                 statp->f_blocks = sbp->sb_rblocks;
 874                 freertx = percpu_counter_sum_positive(&mp->m_frextents);
 875                 statp->f_bavail = statp->f_bfree = freertx * sbp->sb_rextsize;
 876         }
 877
 878         return 0;
 879 }
 880
 881 STATIC void
 882 xfs_save_resvblks(struct xfs_mount *mp)
 883 {
 884         uint64_t resblks = 0;
 885
 886         mp->m_resblks_save = mp->m_resblks;
 887         xfs_reserve_blocks(mp, &resblks, NULL);
 888 }
 889
 890 STATIC void
 891 xfs_restore_resvblks(struct xfs_mount *mp)
 892 {
 893         uint64_t resblks;
 894
 895         if (mp->m_resblks_save) {
 896                 resblks = mp->m_resblks_save;
 897                 mp->m_resblks_save = 0;
 898         } else
 899                 resblks = xfs_default_resblks(mp);
 900
 901         xfs_reserve_blocks(mp, &resblks, NULL);
 902 }
 903
 904 /*
 905  * Second stage of a freeze. The data is already frozen so we only
 906  * need to take care of the metadata. Once that's done sync the superblock
 907  * to the log to dirty it in case of a crash while frozen. This ensures that we
 908  * will recover the unlinked inode lists on the next mount.
 909  */
 910 STATIC int
 911 xfs_fs_freeze(
 912         struct super_block      *sb)
 913 {
 914         struct xfs_mount        *mp = XFS_M(sb);
 915         unsigned int            flags;
 916         int                     ret;
 917
 918         /*
 919          * The filesystem is now frozen far enough that memory reclaim
 920          * cannot safely operate on the filesystem. Hence we need to
 921          * set a GFP_NOFS context here to avoid recursion deadlocks.
 922          */
 923         flags = memalloc_nofs_save();
 924         xfs_save_resvblks(mp);
 925         ret = xfs_log_quiesce(mp);
 926         memalloc_nofs_restore(flags);
 927
 928         /*
 929          * For read-write filesystems, we need to restart the inodegc on error
 930          * because we stopped it at SB_FREEZE_PAGEFAULT level and a thaw is not
 931          * going to be run to restart it now.  We are at SB_FREEZE_FS level
 932          * here, so we can restart safely without racing with a stop in
 933          * xfs_fs_sync_fs().
 934          */
 935         if (ret && !xfs_is_readonly(mp)) {
 936                 xfs_blockgc_start(mp);
 937                 xfs_inodegc_start(mp);
 938         }
 939
 940         return ret;
 941 }
 942
 943 STATIC int
 944 xfs_fs_unfreeze(
 945         struct super_block      *sb)
 946 {
 947         struct xfs_mount        *mp = XFS_M(sb);
 948
 949         xfs_restore_resvblks(mp);
 950         xfs_log_work_queue(mp);
 951
 952         /*
 953          * Don't reactivate the inodegc worker on a readonly filesystem because
 954          * inodes are sent directly to reclaim.  Don't reactivate the blockgc
 955          * worker because there are no speculative preallocations on a readonly
 956          * filesystem.
 957          */
 958         if (!xfs_is_readonly(mp)) {
 959                 xfs_blockgc_start(mp);
 960                 xfs_inodegc_start(mp);
 961         }
 962
 963         return 0;
 964 }
 965
 966 /*
 967  * This function fills in xfs_mount_t fields based on mount args.
 968  * Note: the superblock _has_ now been read in.
 969  */
 970 STATIC int
 971 xfs_finish_flags(
 972         struct xfs_mount        *mp)
 973 {
 974         /* Fail a mount where the logbuf is smaller than the log stripe */
 975         if (xfs_has_logv2(mp)) {
 976                 if (mp->m_logbsize <= 0 &&
 977                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
 978                         mp->m_logbsize = mp->m_sb.sb_logsunit;
 979                 } else if (mp->m_logbsize > 0 &&
 980                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
 981                         xfs_warn(mp,
 982                 "logbuf size must be greater than or equal to log stripe size");
 983                         return -EINVAL;
 984                 }
 985         } else {
 986                 /* Fail a mount if the logbuf is larger than 32K */
 987                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
 988                         xfs_warn(mp,
 989                 "logbuf size for version 1 logs must be 16K or 32K");
 990                         return -EINVAL;
 991                 }
 992         }
 993
 994         /*
 995          * V5 filesystems always use attr2 format for attributes.
 996          */
 997         if (xfs_has_crc(mp) && xfs_has_noattr2(mp)) {
 998                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
 999                              "attr2 is always enabled for V5 filesystems.");
1000                 return -EINVAL;
1001         }
1002
1003         /*
1004          * prohibit r/w mounts of read-only filesystems
1005          */
1006         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !xfs_is_readonly(mp)) {
1007                 xfs_warn(mp,
1008                         "cannot mount a read-only filesystem as read-write");
1009                 return -EROFS;
1010         }
1011
1012         if ((mp->m_qflags & XFS_GQUOTA_ACCT) &&
1013             (mp->m_qflags & XFS_PQUOTA_ACCT) &&
1014             !xfs_has_pquotino(mp)) {
1015                 xfs_warn(mp,
1016                   "Super block does not support project and group quota together");
1017                 return -EINVAL;
1018         }
1019
1020         return 0;
1021 }
1022
1023 static int
1024 xfs_init_percpu_counters(
1025         struct xfs_mount        *mp)
1026 {
1027         int             error;
1028
1029         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1030         if (error)
1031                 return -ENOMEM;
1032
1033         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1034         if (error)
1035                 goto free_icount;
1036
1037         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1038         if (error)
1039                 goto free_ifree;
1040
1041         error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL);
1042         if (error)
1043                 goto free_fdblocks;
1044
1045         error = percpu_counter_init(&mp->m_frextents, 0, GFP_KERNEL);
1046         if (error)
1047                 goto free_delalloc;
1048
1049         return 0;
1050
1051 free_delalloc:
1052         percpu_counter_destroy(&mp->m_delalloc_blks);
1053 free_fdblocks:
1054         percpu_counter_destroy(&mp->m_fdblocks);
1055 free_ifree:
1056         percpu_counter_destroy(&mp->m_ifree);
1057 free_icount:
1058         percpu_counter_destroy(&mp->m_icount);
1059         return -ENOMEM;
1060 }
1061
1062 void
1063 xfs_reinit_percpu_counters(
1064         struct xfs_mount        *mp)
1065 {
1066         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1067         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1068         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1069         percpu_counter_set(&mp->m_frextents, mp->m_sb.sb_frextents);
1070 }
1071
1072 static void
1073 xfs_destroy_percpu_counters(
1074         struct xfs_mount        *mp)
1075 {
1076         percpu_counter_destroy(&mp->m_icount);
1077         percpu_counter_destroy(&mp->m_ifree);
1078         percpu_counter_destroy(&mp->m_fdblocks);
1079         ASSERT(xfs_is_shutdown(mp) ||
1080                percpu_counter_sum(&mp->m_delalloc_blks) == 0);
1081         percpu_counter_destroy(&mp->m_delalloc_blks);
1082         percpu_counter_destroy(&mp->m_frextents);
1083 }
1084
1085 static int
1086 xfs_inodegc_init_percpu(
1087         struct xfs_mount        *mp)
1088 {
1089         struct xfs_inodegc      *gc;
1090         int                     cpu;
1091
1092         mp->m_inodegc = alloc_percpu(struct xfs_inodegc);
1093         if (!mp->m_inodegc)
1094                 return -ENOMEM;
1095
1096         for_each_possible_cpu(cpu) {
1097                 gc = per_cpu_ptr(mp->m_inodegc, cpu);
1098                 init_llist_head(&gc->list);
1099                 gc->items = 0;
1100                 INIT_DELAYED_WORK(&gc->work, xfs_inodegc_worker);
1101         }
1102         return 0;
1103 }
1104
1105 static void
1106 xfs_inodegc_free_percpu(
1107         struct xfs_mount        *mp)
1108 {
1109         if (!mp->m_inodegc)
1110                 return;
1111         free_percpu(mp->m_inodegc);
1112 }
1113
1114 static void
1115 xfs_fs_put_super(
1116         struct super_block      *sb)
1117 {
1118         struct xfs_mount        *mp = XFS_M(sb);
1119
1120         /* if ->fill_super failed, we have no mount to tear down */
1121         if (!sb->s_fs_info)
1122                 return;
1123
1124         xfs_notice(mp, "Unmounting Filesystem %pU", &mp->m_sb.sb_uuid);
1125         xfs_filestream_unmount(mp);
1126         xfs_unmountfs(mp);
1127
1128         xfs_freesb(mp);
1129         free_percpu(mp->m_stats.xs_stats);
1130         xfs_mount_list_del(mp);
1131         xfs_inodegc_free_percpu(mp);
1132         xfs_destroy_percpu_counters(mp);
1133         xfs_destroy_mount_workqueues(mp);
1134         xfs_close_devices(mp);
1135
1136         sb->s_fs_info = NULL;
1137         xfs_mount_free(mp);
1138 }
1139
1140 static long
1141 xfs_fs_nr_cached_objects(
1142         struct super_block      *sb,
1143         struct shrink_control   *sc)
1144 {
1145         /* Paranoia: catch incorrect calls during mount setup or teardown */
1146         if (WARN_ON_ONCE(!sb->s_fs_info))
1147                 return 0;
1148         return xfs_reclaim_inodes_count(XFS_M(sb));
1149 }
1150
1151 static long
1152 xfs_fs_free_cached_objects(
1153         struct super_block      *sb,
1154         struct shrink_control   *sc)
1155 {
1156         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1157 }
1158
1159 static const struct super_operations xfs_super_operations = {
1160         .alloc_inode            = xfs_fs_alloc_inode,
1161         .destroy_inode          = xfs_fs_destroy_inode,
1162         .dirty_inode            = xfs_fs_dirty_inode,
1163         .drop_inode             = xfs_fs_drop_inode,
1164         .put_super              = xfs_fs_put_super,
1165         .sync_fs                = xfs_fs_sync_fs,
1166         .freeze_fs              = xfs_fs_freeze,
1167         .unfreeze_fs            = xfs_fs_unfreeze,
1168         .statfs                 = xfs_fs_statfs,
1169         .show_options           = xfs_fs_show_options,
1170         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1171         .free_cached_objects    = xfs_fs_free_cached_objects,
1172 };
1173
1174 static int
1175 suffix_kstrtoint(
1176         const char      *s,
1177         unsigned int    base,
1178         int             *res)
1179 {
1180         int             last, shift_left_factor = 0, _res;
1181         char            *value;
1182         int             ret = 0;
1183
1184         value = kstrdup(s, GFP_KERNEL);
1185         if (!value)
1186                 return -ENOMEM;
1187
1188         last = strlen(value) - 1;
1189         if (value[last] == 'K' || value[last] == 'k') {
1190                 shift_left_factor = 10;
1191                 value[last] = '\0';
1192         }
1193         if (value[last] == 'M' || value[last] == 'm') {
1194                 shift_left_factor = 20;
1195                 value[last] = '\0';
1196         }
1197         if (value[last] == 'G' || value[last] == 'g') {
1198                 shift_left_factor = 30;
1199                 value[last] = '\0';
1200         }
1201
1202         if (kstrtoint(value, base, &_res))
1203                 ret = -EINVAL;
1204         kfree(value);
1205         *res = _res << shift_left_factor;
1206         return ret;
1207 }
1208
1209 static inline void
1210 xfs_fs_warn_deprecated(
1211         struct fs_context       *fc,
1212         struct fs_parameter     *param,
1213         uint64_t                flag,
1214         bool                    value)
1215 {
1216         /* Don't print the warning if reconfiguring and current mount point
1217          * already had the flag set
1218          */
1219         if ((fc->purpose & FS_CONTEXT_FOR_RECONFIGURE) &&
1220             !!(XFS_M(fc->root->d_sb)->m_features & flag) == value)
1221                 return;
1222         xfs_warn(fc->s_fs_info, "%s mount option is deprecated.", param->key);
1223 }
1224
1225 /*
1226  * Set mount state from a mount option.
1227  *
1228  * NOTE: mp->m_super is NULL here!
1229  */
1230 static int
1231 xfs_fs_parse_param(
1232         struct fs_context       *fc,
1233         struct fs_parameter     *param)
1234 {
1235         struct xfs_mount        *parsing_mp = fc->s_fs_info;
1236         struct fs_parse_result  result;
1237         int                     size = 0;
1238         int                     opt;
1239
1240         opt = fs_parse(fc, xfs_fs_parameters, param, &result);
1241         if (opt < 0)
1242                 return opt;
1243
1244         switch (opt) {
1245         case Opt_logbufs:
1246                 parsing_mp->m_logbufs = result.uint_32;
1247                 return 0;
1248         case Opt_logbsize:
1249                 if (suffix_kstrtoint(param->string, 10, &parsing_mp->m_logbsize))
1250                         return -EINVAL;
1251                 return 0;
1252         case Opt_logdev:
1253                 kfree(parsing_mp->m_logname);
1254                 parsing_mp->m_logname = kstrdup(param->string, GFP_KERNEL);
1255                 if (!parsing_mp->m_logname)
1256                         return -ENOMEM;
1257                 return 0;
1258         case Opt_rtdev:
1259                 kfree(parsing_mp->m_rtname);
1260                 parsing_mp->m_rtname = kstrdup(param->string, GFP_KERNEL);
1261                 if (!parsing_mp->m_rtname)
1262                         return -ENOMEM;
1263                 return 0;
1264         case Opt_allocsize:
1265                 if (suffix_kstrtoint(param->string, 10, &size))
1266                         return -EINVAL;
1267                 parsing_mp->m_allocsize_log = ffs(size) - 1;
1268                 parsing_mp->m_features |= XFS_FEAT_ALLOCSIZE;
1269                 return 0;
1270         case Opt_grpid:
1271         case Opt_bsdgroups:
1272                 parsing_mp->m_features |= XFS_FEAT_GRPID;
1273                 return 0;
1274         case Opt_nogrpid:
1275         case Opt_sysvgroups:
1276                 parsing_mp->m_features &= ~XFS_FEAT_GRPID;
1277                 return 0;
1278         case Opt_wsync:
1279                 parsing_mp->m_features |= XFS_FEAT_WSYNC;
1280                 return 0;
1281         case Opt_norecovery:
1282                 parsing_mp->m_features |= XFS_FEAT_NORECOVERY;
1283                 return 0;
1284         case Opt_noalign:
1285                 parsing_mp->m_features |= XFS_FEAT_NOALIGN;
1286                 return 0;
1287         case Opt_swalloc:
1288                 parsing_mp->m_features |= XFS_FEAT_SWALLOC;
1289                 return 0;
1290         case Opt_sunit:
1291                 parsing_mp->m_dalign = result.uint_32;
1292                 return 0;
1293         case Opt_swidth:
1294                 parsing_mp->m_swidth = result.uint_32;
1295                 return 0;
1296         case Opt_inode32:
1297                 parsing_mp->m_features |= XFS_FEAT_SMALL_INUMS;
1298                 return 0;
1299         case Opt_inode64:
1300                 parsing_mp->m_features &= ~XFS_FEAT_SMALL_INUMS;
1301                 return 0;
1302         case Opt_nouuid:
1303                 parsing_mp->m_features |= XFS_FEAT_NOUUID;
1304                 return 0;
1305         case Opt_largeio:
1306                 parsing_mp->m_features |= XFS_FEAT_LARGE_IOSIZE;
1307                 return 0;
1308         case Opt_nolargeio:
1309                 parsing_mp->m_features &= ~XFS_FEAT_LARGE_IOSIZE;
1310                 return 0;
1311         case Opt_filestreams:
1312                 parsing_mp->m_features |= XFS_FEAT_FILESTREAMS;
1313                 return 0;
1314         case Opt_noquota:
1315                 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
1316                 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
1317                 return 0;
1318         case Opt_quota:
1319         case Opt_uquota:
1320         case Opt_usrquota:
1321                 parsing_mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ENFD);
1322                 return 0;
1323         case Opt_qnoenforce:
1324         case Opt_uqnoenforce:
1325                 parsing_mp->m_qflags |= XFS_UQUOTA_ACCT;
1326                 parsing_mp->m_qflags &= ~XFS_UQUOTA_ENFD;
1327                 return 0;
1328         case Opt_pquota:
1329         case Opt_prjquota:
1330                 parsing_mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ENFD);
1331                 return 0;
1332         case Opt_pqnoenforce:
1333                 parsing_mp->m_qflags |= XFS_PQUOTA_ACCT;
1334                 parsing_mp->m_qflags &= ~XFS_PQUOTA_ENFD;
1335                 return 0;
1336         case Opt_gquota:
1337         case Opt_grpquota:
1338                 parsing_mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ENFD);
1339                 return 0;
1340         case Opt_gqnoenforce:
1341                 parsing_mp->m_qflags |= XFS_GQUOTA_ACCT;
1342                 parsing_mp->m_qflags &= ~XFS_GQUOTA_ENFD;
1343                 return 0;
1344         case Opt_discard:
1345                 parsing_mp->m_features |= XFS_FEAT_DISCARD;
1346                 return 0;
1347         case Opt_nodiscard:
1348                 parsing_mp->m_features &= ~XFS_FEAT_DISCARD;
1349                 return 0;
1350 #ifdef CONFIG_FS_DAX
1351         case Opt_dax:
1352                 xfs_mount_set_dax_mode(parsing_mp, XFS_DAX_ALWAYS);
1353                 return 0;
1354         case Opt_dax_enum:
1355                 xfs_mount_set_dax_mode(parsing_mp, result.uint_32);
1356                 return 0;
1357 #endif
1358         /* Following mount options will be removed in September 2025 */
1359         case Opt_ikeep:
1360                 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_IKEEP, true);
1361                 parsing_mp->m_features |= XFS_FEAT_IKEEP;
1362                 return 0;
1363         case Opt_noikeep:
1364                 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_IKEEP, false);
1365                 parsing_mp->m_features &= ~XFS_FEAT_IKEEP;
1366                 return 0;
1367         case Opt_attr2:
1368                 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_ATTR2, true);
1369                 parsing_mp->m_features |= XFS_FEAT_ATTR2;
1370                 return 0;
1371         case Opt_noattr2:
1372                 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_NOATTR2, true);
1373                 parsing_mp->m_features |= XFS_FEAT_NOATTR2;
1374                 return 0;
1375         default:
1376                 xfs_warn(parsing_mp, "unknown mount option [%s].", param->key);
1377                 return -EINVAL;
1378         }
1379
1380         return 0;
1381 }
1382
1383 static int
1384 xfs_fs_validate_params(
1385         struct xfs_mount        *mp)
1386 {
1387         /* No recovery flag requires a read-only mount */
1388         if (xfs_has_norecovery(mp) && !xfs_is_readonly(mp)) {
1389                 xfs_warn(mp, "no-recovery mounts must be read-only.");
1390                 return -EINVAL;
1391         }
1392
1393         /*
1394          * We have not read the superblock at this point, so only the attr2
1395          * mount option can set the attr2 feature by this stage.
1396          */
1397         if (xfs_has_attr2(mp) && xfs_has_noattr2(mp)) {
1398                 xfs_warn(mp, "attr2 and noattr2 cannot both be specified.");
1399                 return -EINVAL;
1400         }
1401
1402
1403         if (xfs_has_noalign(mp) && (mp->m_dalign || mp->m_swidth)) {
1404                 xfs_warn(mp,
1405         "sunit and swidth options incompatible with the noalign option");
1406                 return -EINVAL;
1407         }
1408
1409         if (!IS_ENABLED(CONFIG_XFS_QUOTA) && mp->m_qflags != 0) {
1410                 xfs_warn(mp, "quota support not available in this kernel.");
1411                 return -EINVAL;
1412         }
1413
1414         if ((mp->m_dalign && !mp->m_swidth) ||
1415             (!mp->m_dalign && mp->m_swidth)) {
1416                 xfs_warn(mp, "sunit and swidth must be specified together");
1417                 return -EINVAL;
1418         }
1419
1420         if (mp->m_dalign && (mp->m_swidth % mp->m_dalign != 0)) {
1421                 xfs_warn(mp,
1422         "stripe width (%d) must be a multiple of the stripe unit (%d)",
1423                         mp->m_swidth, mp->m_dalign);
1424                 return -EINVAL;
1425         }
1426
1427         if (mp->m_logbufs != -1 &&
1428             mp->m_logbufs != 0 &&
1429             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
1430              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
1431                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
1432                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
1433                 return -EINVAL;
1434         }
1435
1436         if (mp->m_logbsize != -1 &&
1437             mp->m_logbsize !=  0 &&
1438             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
1439              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
1440              !is_power_of_2(mp->m_logbsize))) {
1441                 xfs_warn(mp,
1442                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
1443                         mp->m_logbsize);
1444                 return -EINVAL;
1445         }
1446
1447         if (xfs_has_allocsize(mp) &&
1448             (mp->m_allocsize_log > XFS_MAX_IO_LOG ||
1449              mp->m_allocsize_log < XFS_MIN_IO_LOG)) {
1450                 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
1451                         mp->m_allocsize_log, XFS_MIN_IO_LOG, XFS_MAX_IO_LOG);
1452                 return -EINVAL;
1453         }
1454
1455         return 0;
1456 }
1457
1458 static int
1459 xfs_fs_fill_super(
1460         struct super_block      *sb,
1461         struct fs_context       *fc)
1462 {
1463         struct xfs_mount        *mp = sb->s_fs_info;
1464         struct inode            *root;
1465         int                     flags = 0, error;
1466
1467         mp->m_super = sb;
1468
1469         error = xfs_fs_validate_params(mp);
1470         if (error)
1471                 goto out_free_names;
1472
1473         sb_min_blocksize(sb, BBSIZE);
1474         sb->s_xattr = xfs_xattr_handlers;
1475         sb->s_export_op = &xfs_export_operations;
1476 #ifdef CONFIG_XFS_QUOTA
1477         sb->s_qcop = &xfs_quotactl_operations;
1478         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1479 #endif
1480         sb->s_op = &xfs_super_operations;
1481
1482         /*
1483          * Delay mount work if the debug hook is set. This is debug
1484          * instrumention to coordinate simulation of xfs mount failures with
1485          * VFS superblock operations
1486          */
1487         if (xfs_globals.mount_delay) {
1488                 xfs_notice(mp, "Delaying mount for %d seconds.",
1489                         xfs_globals.mount_delay);
1490                 msleep(xfs_globals.mount_delay * 1000);
1491         }
1492
1493         if (fc->sb_flags & SB_SILENT)
1494                 flags |= XFS_MFSI_QUIET;
1495
1496         error = xfs_open_devices(mp);
1497         if (error)
1498                 goto out_free_names;
1499
1500         error = xfs_init_mount_workqueues(mp);
1501         if (error)
1502                 goto out_close_devices;
1503
1504         error = xfs_init_percpu_counters(mp);
1505         if (error)
1506                 goto out_destroy_workqueues;
1507
1508         error = xfs_inodegc_init_percpu(mp);
1509         if (error)
1510                 goto out_destroy_counters;
1511
1512         /*
1513          * All percpu data structures requiring cleanup when a cpu goes offline
1514          * must be allocated before adding this @mp to the cpu-dead handler's
1515          * mount list.
1516          */
1517         xfs_mount_list_add(mp);
1518
1519         /* Allocate stats memory before we do operations that might use it */
1520         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1521         if (!mp->m_stats.xs_stats) {
1522                 error = -ENOMEM;
1523                 goto out_destroy_inodegc;
1524         }
1525
1526         error = xfs_readsb(mp, flags);
1527         if (error)
1528                 goto out_free_stats;
1529
1530         error = xfs_finish_flags(mp);
1531         if (error)
1532                 goto out_free_sb;
1533
1534         error = xfs_setup_devices(mp);
1535         if (error)
1536                 goto out_free_sb;
1537
1538         /* V4 support is undergoing deprecation. */
1539         if (!xfs_has_crc(mp)) {
1540 #ifdef CONFIG_XFS_SUPPORT_V4
1541                 xfs_warn_once(mp,
1542         "Deprecated V4 format (crc=0) will not be supported after September 2030.");
1543 #else
1544                 xfs_warn(mp,
1545         "Deprecated V4 format (crc=0) not supported by kernel.");
1546                 error = -EINVAL;
1547                 goto out_free_sb;
1548 #endif
1549         }
1550
1551         /* ASCII case insensitivity is undergoing deprecation. */
1552         if (xfs_has_asciici(mp)) {
1553 #ifdef CONFIG_XFS_SUPPORT_ASCII_CI
1554                 xfs_warn_once(mp,
1555         "Deprecated ASCII case-insensitivity feature (ascii-ci=1) will not be supported after September 2030.");
1556 #else
1557                 xfs_warn(mp,
1558         "Deprecated ASCII case-insensitivity feature (ascii-ci=1) not supported by kernel.");
1559                 error = -EINVAL;
1560                 goto out_free_sb;
1561 #endif
1562         }
1563
1564         /* Filesystem claims it needs repair, so refuse the mount. */
1565         if (xfs_has_needsrepair(mp)) {
1566                 xfs_warn(mp, "Filesystem needs repair.  Please run xfs_repair.");
1567                 error = -EFSCORRUPTED;
1568                 goto out_free_sb;
1569         }
1570
1571         /*
1572          * Don't touch the filesystem if a user tool thinks it owns the primary
1573          * superblock.  mkfs doesn't clear the flag from secondary supers, so
1574          * we don't check them at all.
1575          */
1576         if (mp->m_sb.sb_inprogress) {
1577                 xfs_warn(mp, "Offline file system operation in progress!");
1578                 error = -EFSCORRUPTED;
1579                 goto out_free_sb;
1580         }
1581
1582         /*
1583          * Until this is fixed only page-sized or smaller data blocks work.
1584          */
1585         if (mp->m_sb.sb_blocksize > PAGE_SIZE) {
1586                 xfs_warn(mp,
1587                 "File system with blocksize %d bytes. "
1588                 "Only pagesize (%ld) or less will currently work.",
1589                                 mp->m_sb.sb_blocksize, PAGE_SIZE);
1590                 error = -ENOSYS;
1591                 goto out_free_sb;
1592         }
1593
1594         /* Ensure this filesystem fits in the page cache limits */
1595         if (xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_dblocks) ||
1596             xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_rblocks)) {
1597                 xfs_warn(mp,
1598                 "file system too large to be mounted on this system.");
1599                 error = -EFBIG;
1600                 goto out_free_sb;
1601         }
1602
1603         /*
1604          * XFS block mappings use 54 bits to store the logical block offset.
1605          * This should suffice to handle the maximum file size that the VFS
1606          * supports (currently 2^63 bytes on 64-bit and ULONG_MAX << PAGE_SHIFT
1607          * bytes on 32-bit), but as XFS and VFS have gotten the s_maxbytes
1608          * calculation wrong on 32-bit kernels in the past, we'll add a WARN_ON
1609          * to check this assertion.
1610          *
1611          * Avoid integer overflow by comparing the maximum bmbt offset to the
1612          * maximum pagecache offset in units of fs blocks.
1613          */
1614         if (!xfs_verify_fileoff(mp, XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE))) {
1615                 xfs_warn(mp,
1616 "MAX_LFS_FILESIZE block offset (%llu) exceeds extent map maximum (%llu)!",
1617                          XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE),
1618                          XFS_MAX_FILEOFF);
1619                 error = -EINVAL;
1620                 goto out_free_sb;
1621         }
1622
1623         error = xfs_filestream_mount(mp);
1624         if (error)
1625                 goto out_free_sb;
1626
1627         /*
1628          * we must configure the block size in the superblock before we run the
1629          * full mount process as the mount process can lookup and cache inodes.
1630          */
1631         sb->s_magic = XFS_SUPER_MAGIC;
1632         sb->s_blocksize = mp->m_sb.sb_blocksize;
1633         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1634         sb->s_maxbytes = MAX_LFS_FILESIZE;
1635         sb->s_max_links = XFS_MAXLINK;
1636         sb->s_time_gran = 1;
1637         if (xfs_has_bigtime(mp)) {
1638                 sb->s_time_min = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MIN);
1639                 sb->s_time_max = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MAX);
1640         } else {
1641                 sb->s_time_min = XFS_LEGACY_TIME_MIN;
1642                 sb->s_time_max = XFS_LEGACY_TIME_MAX;
1643         }
1644         trace_xfs_inode_timestamp_range(mp, sb->s_time_min, sb->s_time_max);
1645         sb->s_iflags |= SB_I_CGROUPWB;
1646
1647         set_posix_acl_flag(sb);
1648
1649         /* version 5 superblocks support inode version counters. */
1650         if (xfs_has_crc(mp))
1651                 sb->s_flags |= SB_I_VERSION;
1652
1653         if (xfs_has_dax_always(mp)) {
1654                 error = xfs_setup_dax_always(mp);
1655                 if (error)
1656                         goto out_filestream_unmount;
1657         }
1658
1659         if (xfs_has_discard(mp) && !bdev_max_discard_sectors(sb->s_bdev)) {
1660                 xfs_warn(mp,
1661         "mounting with \"discard\" option, but the device does not support discard");
1662                 mp->m_features &= ~XFS_FEAT_DISCARD;
1663         }
1664
1665         if (xfs_has_reflink(mp)) {
1666                 if (mp->m_sb.sb_rblocks) {
1667                         xfs_alert(mp,
1668         "reflink not compatible with realtime device!");
1669                         error = -EINVAL;
1670                         goto out_filestream_unmount;
1671                 }
1672
1673                 if (xfs_globals.always_cow) {
1674                         xfs_info(mp, "using DEBUG-only always_cow mode.");
1675                         mp->m_always_cow = true;
1676                 }
1677         }
1678
1679         if (xfs_has_rmapbt(mp) && mp->m_sb.sb_rblocks) {
1680                 xfs_alert(mp,
1681         "reverse mapping btree not compatible with realtime device!");
1682                 error = -EINVAL;
1683                 goto out_filestream_unmount;
1684         }
1685
1686         if (xfs_has_large_extent_counts(mp))
1687                 xfs_warn(mp,
1688         "EXPERIMENTAL Large extent counts feature in use. Use at your own risk!");
1689
1690         error = xfs_mountfs(mp);
1691         if (error)
1692                 goto out_filestream_unmount;
1693
1694         root = igrab(VFS_I(mp->m_rootip));
1695         if (!root) {
1696                 error = -ENOENT;
1697                 goto out_unmount;
1698         }
1699         sb->s_root = d_make_root(root);
1700         if (!sb->s_root) {
1701                 error = -ENOMEM;
1702                 goto out_unmount;
1703         }
1704
1705         return 0;
1706
1707  out_filestream_unmount:
1708         xfs_filestream_unmount(mp);
1709  out_free_sb:
1710         xfs_freesb(mp);
1711  out_free_stats:
1712         free_percpu(mp->m_stats.xs_stats);
1713  out_destroy_inodegc:
1714         xfs_mount_list_del(mp);
1715         xfs_inodegc_free_percpu(mp);
1716  out_destroy_counters:
1717         xfs_destroy_percpu_counters(mp);
1718  out_destroy_workqueues:
1719         xfs_destroy_mount_workqueues(mp);
1720  out_close_devices:
1721         xfs_close_devices(mp);
1722  out_free_names:
1723         sb->s_fs_info = NULL;
1724         xfs_mount_free(mp);
1725         return error;
1726
1727  out_unmount:
1728         xfs_filestream_unmount(mp);
1729         xfs_unmountfs(mp);
1730         goto out_free_sb;
1731 }
1732
1733 static int
1734 xfs_fs_get_tree(
1735         struct fs_context       *fc)
1736 {
1737         return get_tree_bdev(fc, xfs_fs_fill_super);
1738 }
1739
1740 static int
1741 xfs_remount_rw(
1742         struct xfs_mount        *mp)
1743 {
1744         struct xfs_sb           *sbp = &mp->m_sb;
1745         int error;
1746
1747         if (xfs_has_norecovery(mp)) {
1748                 xfs_warn(mp,
1749                         "ro->rw transition prohibited on norecovery mount");
1750                 return -EINVAL;
1751         }
1752
1753         if (xfs_sb_is_v5(sbp) &&
1754             xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1755                 xfs_warn(mp,
1756         "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1757                         (sbp->sb_features_ro_compat &
1758                                 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1759                 return -EINVAL;
1760         }
1761
1762         clear_bit(XFS_OPSTATE_READONLY, &mp->m_opstate);
1763
1764         /*
1765          * If this is the first remount to writeable state we might have some
1766          * superblock changes to update.
1767          */
1768         if (mp->m_update_sb) {
1769                 error = xfs_sync_sb(mp, false);
1770                 if (error) {
1771                         xfs_warn(mp, "failed to write sb changes");
1772                         return error;
1773                 }
1774                 mp->m_update_sb = false;
1775         }
1776
1777         /*
1778          * Fill out the reserve pool if it is empty. Use the stashed value if
1779          * it is non-zero, otherwise go with the default.
1780          */
1781         xfs_restore_resvblks(mp);
1782         xfs_log_work_queue(mp);
1783         xfs_blockgc_start(mp);
1784
1785         /* Create the per-AG metadata reservation pool .*/
1786         error = xfs_fs_reserve_ag_blocks(mp);
1787         if (error && error != -ENOSPC)
1788                 return error;
1789
1790         /* Re-enable the background inode inactivation worker. */
1791         xfs_inodegc_start(mp);
1792
1793         return 0;
1794 }
1795
1796 static int
1797 xfs_remount_ro(
1798         struct xfs_mount        *mp)
1799 {
1800         struct xfs_icwalk       icw = {
1801                 .icw_flags      = XFS_ICWALK_FLAG_SYNC,
1802         };
1803         int                     error;
1804
1805         /* Flush all the dirty data to disk. */
1806         error = sync_filesystem(mp->m_super);
1807         if (error)
1808                 return error;
1809
1810         /*
1811          * Cancel background eofb scanning so it cannot race with the final
1812          * log force+buftarg wait and deadlock the remount.
1813          */
1814         xfs_blockgc_stop(mp);
1815
1816         /*
1817          * Clear out all remaining COW staging extents and speculative post-EOF
1818          * preallocations so that we don't leave inodes requiring inactivation
1819          * cleanups during reclaim on a read-only mount.  We must process every
1820          * cached inode, so this requires a synchronous cache scan.
1821          */
1822         error = xfs_blockgc_free_space(mp, &icw);
1823         if (error) {
1824                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1825                 return error;
1826         }
1827
1828         /*
1829          * Stop the inodegc background worker.  xfs_fs_reconfigure already
1830          * flushed all pending inodegc work when it sync'd the filesystem.
1831          * The VFS holds s_umount, so we know that inodes cannot enter
1832          * xfs_fs_destroy_inode during a remount operation.  In readonly mode
1833          * we send inodes straight to reclaim, so no inodes will be queued.
1834          */
1835         xfs_inodegc_stop(mp);
1836
1837         /* Free the per-AG metadata reservation pool. */
1838         error = xfs_fs_unreserve_ag_blocks(mp);
1839         if (error) {
1840                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1841                 return error;
1842         }
1843
1844         /*
1845          * Before we sync the metadata, we need to free up the reserve block
1846          * pool so that the used block count in the superblock on disk is
1847          * correct at the end of the remount. Stash the current* reserve pool
1848          * size so that if we get remounted rw, we can return it to the same
1849          * size.
1850          */
1851         xfs_save_resvblks(mp);
1852
1853         xfs_log_clean(mp);
1854         set_bit(XFS_OPSTATE_READONLY, &mp->m_opstate);
1855
1856         return 0;
1857 }
1858
1859 /*
1860  * Logically we would return an error here to prevent users from believing
1861  * they might have changed mount options using remount which can't be changed.
1862  *
1863  * But unfortunately mount(8) adds all options from mtab and fstab to the mount
1864  * arguments in some cases so we can't blindly reject options, but have to
1865  * check for each specified option if it actually differs from the currently
1866  * set option and only reject it if that's the case.
1867  *
1868  * Until that is implemented we return success for every remount request, and
1869  * silently ignore all options that we can't actually change.
1870  */
1871 static int
1872 xfs_fs_reconfigure(
1873         struct fs_context *fc)
1874 {
1875         struct xfs_mount        *mp = XFS_M(fc->root->d_sb);
1876         struct xfs_mount        *new_mp = fc->s_fs_info;
1877         int                     flags = fc->sb_flags;
1878         int                     error;
1879
1880         /* version 5 superblocks always support version counters. */
1881         if (xfs_has_crc(mp))
1882                 fc->sb_flags |= SB_I_VERSION;
1883
1884         error = xfs_fs_validate_params(new_mp);
1885         if (error)
1886                 return error;
1887
1888         /* inode32 -> inode64 */
1889         if (xfs_has_small_inums(mp) && !xfs_has_small_inums(new_mp)) {
1890                 mp->m_features &= ~XFS_FEAT_SMALL_INUMS;
1891                 mp->m_maxagi = xfs_set_inode_alloc(mp, mp->m_sb.sb_agcount);
1892         }
1893
1894         /* inode64 -> inode32 */
1895         if (!xfs_has_small_inums(mp) && xfs_has_small_inums(new_mp)) {
1896                 mp->m_features |= XFS_FEAT_SMALL_INUMS;
1897                 mp->m_maxagi = xfs_set_inode_alloc(mp, mp->m_sb.sb_agcount);
1898         }
1899
1900         /* ro -> rw */
1901         if (xfs_is_readonly(mp) && !(flags & SB_RDONLY)) {
1902                 error = xfs_remount_rw(mp);
1903                 if (error)
1904                         return error;
1905         }
1906
1907         /* rw -> ro */
1908         if (!xfs_is_readonly(mp) && (flags & SB_RDONLY)) {
1909                 error = xfs_remount_ro(mp);
1910                 if (error)
1911                         return error;
1912         }
1913
1914         return 0;
1915 }
1916
1917 static void xfs_fs_free(
1918         struct fs_context       *fc)
1919 {
1920         struct xfs_mount        *mp = fc->s_fs_info;
1921
1922         /*
1923          * mp is stored in the fs_context when it is initialized.
1924          * mp is transferred to the superblock on a successful mount,
1925          * but if an error occurs before the transfer we have to free
1926          * it here.
1927          */
1928         if (mp)
1929                 xfs_mount_free(mp);
1930 }
1931
1932 static const struct fs_context_operations xfs_context_ops = {
1933         .parse_param = xfs_fs_parse_param,
1934         .get_tree    = xfs_fs_get_tree,
1935         .reconfigure = xfs_fs_reconfigure,
1936         .free        = xfs_fs_free,
1937 };
1938
1939 static int xfs_init_fs_context(
1940         struct fs_context       *fc)
1941 {
1942         struct xfs_mount        *mp;
1943
1944         mp = kmem_alloc(sizeof(struct xfs_mount), KM_ZERO);
1945         if (!mp)
1946                 return -ENOMEM;
1947
1948         spin_lock_init(&mp->m_sb_lock);
1949         INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
1950         spin_lock_init(&mp->m_perag_lock);
1951         mutex_init(&mp->m_growlock);
1952         INIT_WORK(&mp->m_flush_inodes_work, xfs_flush_inodes_worker);
1953         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1954         mp->m_kobj.kobject.kset = xfs_kset;
1955         /*
1956          * We don't create the finobt per-ag space reservation until after log
1957          * recovery, so we must set this to true so that an ifree transaction
1958          * started during log recovery will not depend on space reservations
1959          * for finobt expansion.
1960          */
1961         mp->m_finobt_nores = true;
1962
1963         /*
1964          * These can be overridden by the mount option parsing.
1965          */
1966         mp->m_logbufs = -1;
1967         mp->m_logbsize = -1;
1968         mp->m_allocsize_log = 16; /* 64k */
1969
1970         /*
1971          * Copy binary VFS mount flags we are interested in.
1972          */
1973         if (fc->sb_flags & SB_RDONLY)
1974                 set_bit(XFS_OPSTATE_READONLY, &mp->m_opstate);
1975         if (fc->sb_flags & SB_DIRSYNC)
1976                 mp->m_features |= XFS_FEAT_DIRSYNC;
1977         if (fc->sb_flags & SB_SYNCHRONOUS)
1978                 mp->m_features |= XFS_FEAT_WSYNC;
1979
1980         fc->s_fs_info = mp;
1981         fc->ops = &xfs_context_ops;
1982
1983         return 0;
1984 }
1985
1986 static struct file_system_type xfs_fs_type = {
1987         .owner                  = THIS_MODULE,
1988         .name                   = "xfs",
1989         .init_fs_context        = xfs_init_fs_context,
1990         .parameters             = xfs_fs_parameters,
1991         .kill_sb                = kill_block_super,
1992         .fs_flags               = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
1993 };
1994 MODULE_ALIAS_FS("xfs");
1995
1996 STATIC int __init
1997 xfs_init_caches(void)
1998 {
1999         int             error;
2000
2001         xfs_buf_cache = kmem_cache_create("xfs_buf", sizeof(struct xfs_buf), 0,
2002                                          SLAB_HWCACHE_ALIGN |
2003                                          SLAB_RECLAIM_ACCOUNT |
2004                                          SLAB_MEM_SPREAD,
2005                                          NULL);
2006         if (!xfs_buf_cache)
2007                 goto out;
2008
2009         xfs_log_ticket_cache = kmem_cache_create("xfs_log_ticket",
2010                                                 sizeof(struct xlog_ticket),
2011                                                 0, 0, NULL);
2012         if (!xfs_log_ticket_cache)
2013                 goto out_destroy_buf_cache;
2014
2015         error = xfs_btree_init_cur_caches();
2016         if (error)
2017                 goto out_destroy_log_ticket_cache;
2018
2019         error = xfs_defer_init_item_caches();
2020         if (error)
2021                 goto out_destroy_btree_cur_cache;
2022
2023         xfs_da_state_cache = kmem_cache_create("xfs_da_state",
2024                                               sizeof(struct xfs_da_state),
2025                                               0, 0, NULL);
2026         if (!xfs_da_state_cache)
2027                 goto out_destroy_defer_item_cache;
2028
2029         xfs_ifork_cache = kmem_cache_create("xfs_ifork",
2030                                            sizeof(struct xfs_ifork),
2031                                            0, 0, NULL);
2032         if (!xfs_ifork_cache)
2033                 goto out_destroy_da_state_cache;
2034
2035         xfs_trans_cache = kmem_cache_create("xfs_trans",
2036                                            sizeof(struct xfs_trans),
2037                                            0, 0, NULL);
2038         if (!xfs_trans_cache)
2039                 goto out_destroy_ifork_cache;
2040
2041
2042         /*
2043          * The size of the cache-allocated buf log item is the maximum
2044          * size possible under XFS.  This wastes a little bit of memory,
2045          * but it is much faster.
2046          */
2047         xfs_buf_item_cache = kmem_cache_create("xfs_buf_item",
2048                                               sizeof(struct xfs_buf_log_item),
2049                                               0, 0, NULL);
2050         if (!xfs_buf_item_cache)
2051                 goto out_destroy_trans_cache;
2052
2053         xfs_efd_cache = kmem_cache_create("xfs_efd_item",
2054                         xfs_efd_log_item_sizeof(XFS_EFD_MAX_FAST_EXTENTS),
2055                         0, 0, NULL);
2056         if (!xfs_efd_cache)
2057                 goto out_destroy_buf_item_cache;
2058
2059         xfs_efi_cache = kmem_cache_create("xfs_efi_item",
2060                         xfs_efi_log_item_sizeof(XFS_EFI_MAX_FAST_EXTENTS),
2061                         0, 0, NULL);
2062         if (!xfs_efi_cache)
2063                 goto out_destroy_efd_cache;
2064
2065         xfs_inode_cache = kmem_cache_create("xfs_inode",
2066                                            sizeof(struct xfs_inode), 0,
2067                                            (SLAB_HWCACHE_ALIGN |
2068                                             SLAB_RECLAIM_ACCOUNT |
2069                                             SLAB_MEM_SPREAD | SLAB_ACCOUNT),
2070                                            xfs_fs_inode_init_once);
2071         if (!xfs_inode_cache)
2072                 goto out_destroy_efi_cache;
2073
2074         xfs_ili_cache = kmem_cache_create("xfs_ili",
2075                                          sizeof(struct xfs_inode_log_item), 0,
2076                                          SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
2077                                          NULL);
2078         if (!xfs_ili_cache)
2079                 goto out_destroy_inode_cache;
2080
2081         xfs_icreate_cache = kmem_cache_create("xfs_icr",
2082                                              sizeof(struct xfs_icreate_item),
2083                                              0, 0, NULL);
2084         if (!xfs_icreate_cache)
2085                 goto out_destroy_ili_cache;
2086
2087         xfs_rud_cache = kmem_cache_create("xfs_rud_item",
2088                                          sizeof(struct xfs_rud_log_item),
2089                                          0, 0, NULL);
2090         if (!xfs_rud_cache)
2091                 goto out_destroy_icreate_cache;
2092
2093         xfs_rui_cache = kmem_cache_create("xfs_rui_item",
2094                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
2095                         0, 0, NULL);
2096         if (!xfs_rui_cache)
2097                 goto out_destroy_rud_cache;
2098
2099         xfs_cud_cache = kmem_cache_create("xfs_cud_item",
2100                                          sizeof(struct xfs_cud_log_item),
2101                                          0, 0, NULL);
2102         if (!xfs_cud_cache)
2103                 goto out_destroy_rui_cache;
2104
2105         xfs_cui_cache = kmem_cache_create("xfs_cui_item",
2106                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
2107                         0, 0, NULL);
2108         if (!xfs_cui_cache)
2109                 goto out_destroy_cud_cache;
2110
2111         xfs_bud_cache = kmem_cache_create("xfs_bud_item",
2112                                          sizeof(struct xfs_bud_log_item),
2113                                          0, 0, NULL);
2114         if (!xfs_bud_cache)
2115                 goto out_destroy_cui_cache;
2116
2117         xfs_bui_cache = kmem_cache_create("xfs_bui_item",
2118                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
2119                         0, 0, NULL);
2120         if (!xfs_bui_cache)
2121                 goto out_destroy_bud_cache;
2122
2123         xfs_attrd_cache = kmem_cache_create("xfs_attrd_item",
2124                                             sizeof(struct xfs_attrd_log_item),
2125                                             0, 0, NULL);
2126         if (!xfs_attrd_cache)
2127                 goto out_destroy_bui_cache;
2128
2129         xfs_attri_cache = kmem_cache_create("xfs_attri_item",
2130                                             sizeof(struct xfs_attri_log_item),
2131                                             0, 0, NULL);
2132         if (!xfs_attri_cache)
2133                 goto out_destroy_attrd_cache;
2134
2135         xfs_iunlink_cache = kmem_cache_create("xfs_iul_item",
2136                                              sizeof(struct xfs_iunlink_item),
2137                                              0, 0, NULL);
2138         if (!xfs_iunlink_cache)
2139                 goto out_destroy_attri_cache;
2140
2141         return 0;
2142
2143  out_destroy_attri_cache:
2144         kmem_cache_destroy(xfs_attri_cache);
2145  out_destroy_attrd_cache:
2146         kmem_cache_destroy(xfs_attrd_cache);
2147  out_destroy_bui_cache:
2148         kmem_cache_destroy(xfs_bui_cache);
2149  out_destroy_bud_cache:
2150         kmem_cache_destroy(xfs_bud_cache);
2151  out_destroy_cui_cache:
2152         kmem_cache_destroy(xfs_cui_cache);
2153  out_destroy_cud_cache:
2154         kmem_cache_destroy(xfs_cud_cache);
2155  out_destroy_rui_cache:
2156         kmem_cache_destroy(xfs_rui_cache);
2157  out_destroy_rud_cache:
2158         kmem_cache_destroy(xfs_rud_cache);
2159  out_destroy_icreate_cache:
2160         kmem_cache_destroy(xfs_icreate_cache);
2161  out_destroy_ili_cache:
2162         kmem_cache_destroy(xfs_ili_cache);
2163  out_destroy_inode_cache:
2164         kmem_cache_destroy(xfs_inode_cache);
2165  out_destroy_efi_cache:
2166         kmem_cache_destroy(xfs_efi_cache);
2167  out_destroy_efd_cache:
2168         kmem_cache_destroy(xfs_efd_cache);
2169  out_destroy_buf_item_cache:
2170         kmem_cache_destroy(xfs_buf_item_cache);
2171  out_destroy_trans_cache:
2172         kmem_cache_destroy(xfs_trans_cache);
2173  out_destroy_ifork_cache:
2174         kmem_cache_destroy(xfs_ifork_cache);
2175  out_destroy_da_state_cache:
2176         kmem_cache_destroy(xfs_da_state_cache);
2177  out_destroy_defer_item_cache:
2178         xfs_defer_destroy_item_caches();
2179  out_destroy_btree_cur_cache:
2180         xfs_btree_destroy_cur_caches();
2181  out_destroy_log_ticket_cache:
2182         kmem_cache_destroy(xfs_log_ticket_cache);
2183  out_destroy_buf_cache:
2184         kmem_cache_destroy(xfs_buf_cache);
2185  out:
2186         return -ENOMEM;
2187 }
2188
2189 STATIC void
2190 xfs_destroy_caches(void)
2191 {
2192         /*
2193          * Make sure all delayed rcu free are flushed before we
2194          * destroy caches.
2195          */
2196         rcu_barrier();
2197         kmem_cache_destroy(xfs_iunlink_cache);
2198         kmem_cache_destroy(xfs_attri_cache);
2199         kmem_cache_destroy(xfs_attrd_cache);
2200         kmem_cache_destroy(xfs_bui_cache);
2201         kmem_cache_destroy(xfs_bud_cache);
2202         kmem_cache_destroy(xfs_cui_cache);
2203         kmem_cache_destroy(xfs_cud_cache);
2204         kmem_cache_destroy(xfs_rui_cache);
2205         kmem_cache_destroy(xfs_rud_cache);
2206         kmem_cache_destroy(xfs_icreate_cache);
2207         kmem_cache_destroy(xfs_ili_cache);
2208         kmem_cache_destroy(xfs_inode_cache);
2209         kmem_cache_destroy(xfs_efi_cache);
2210         kmem_cache_destroy(xfs_efd_cache);
2211         kmem_cache_destroy(xfs_buf_item_cache);
2212         kmem_cache_destroy(xfs_trans_cache);
2213         kmem_cache_destroy(xfs_ifork_cache);
2214         kmem_cache_destroy(xfs_da_state_cache);
2215         xfs_defer_destroy_item_caches();
2216         xfs_btree_destroy_cur_caches();
2217         kmem_cache_destroy(xfs_log_ticket_cache);
2218         kmem_cache_destroy(xfs_buf_cache);
2219 }
2220
2221 STATIC int __init
2222 xfs_init_workqueues(void)
2223 {
2224         /*
2225          * The allocation workqueue can be used in memory reclaim situations
2226          * (writepage path), and parallelism is only limited by the number of
2227          * AGs in all the filesystems mounted. Hence use the default large
2228          * max_active value for this workqueue.
2229          */
2230         xfs_alloc_wq = alloc_workqueue("xfsalloc",
2231                         XFS_WQFLAGS(WQ_MEM_RECLAIM | WQ_FREEZABLE), 0);
2232         if (!xfs_alloc_wq)
2233                 return -ENOMEM;
2234
2235         xfs_discard_wq = alloc_workqueue("xfsdiscard", XFS_WQFLAGS(WQ_UNBOUND),
2236                         0);
2237         if (!xfs_discard_wq)
2238                 goto out_free_alloc_wq;
2239
2240         return 0;
2241 out_free_alloc_wq:
2242         destroy_workqueue(xfs_alloc_wq);
2243         return -ENOMEM;
2244 }
2245
2246 STATIC void
2247 xfs_destroy_workqueues(void)
2248 {
2249         destroy_workqueue(xfs_discard_wq);
2250         destroy_workqueue(xfs_alloc_wq);
2251 }
2252
2253 #ifdef CONFIG_HOTPLUG_CPU
2254 static int
2255 xfs_cpu_dead(
2256         unsigned int            cpu)
2257 {
2258         struct xfs_mount        *mp, *n;
2259
2260         spin_lock(&xfs_mount_list_lock);
2261         list_for_each_entry_safe(mp, n, &xfs_mount_list, m_mount_list) {
2262                 spin_unlock(&xfs_mount_list_lock);
2263                 xfs_inodegc_cpu_dead(mp, cpu);
2264                 xlog_cil_pcp_dead(mp->m_log, cpu);
2265                 spin_lock(&xfs_mount_list_lock);
2266         }
2267         spin_unlock(&xfs_mount_list_lock);
2268         return 0;
2269 }
2270
2271 static int __init
2272 xfs_cpu_hotplug_init(void)
2273 {
2274         int     error;
2275
2276         error = cpuhp_setup_state_nocalls(CPUHP_XFS_DEAD, "xfs:dead", NULL,
2277                         xfs_cpu_dead);
2278         if (error < 0)
2279                 xfs_alert(NULL,
2280 "Failed to initialise CPU hotplug, error %d. XFS is non-functional.",
2281                         error);
2282         return error;
2283 }
2284
2285 static void
2286 xfs_cpu_hotplug_destroy(void)
2287 {
2288         cpuhp_remove_state_nocalls(CPUHP_XFS_DEAD);
2289 }
2290
2291 #else /* !CONFIG_HOTPLUG_CPU */
2292 static inline int xfs_cpu_hotplug_init(void) { return 0; }
2293 static inline void xfs_cpu_hotplug_destroy(void) {}
2294 #endif
2295
2296 STATIC int __init
2297 init_xfs_fs(void)
2298 {
2299         int                     error;
2300
2301         xfs_check_ondisk_structs();
2302
2303         error = xfs_dahash_test();
2304         if (error)
2305                 return error;
2306
2307         printk(KERN_INFO XFS_VERSION_STRING " with "
2308                          XFS_BUILD_OPTIONS " enabled\n");
2309
2310         xfs_dir_startup();
2311
2312         error = xfs_cpu_hotplug_init();
2313         if (error)
2314                 goto out;
2315
2316         error = xfs_init_caches();
2317         if (error)
2318                 goto out_destroy_hp;
2319
2320         error = xfs_init_workqueues();
2321         if (error)
2322                 goto out_destroy_caches;
2323
2324         error = xfs_mru_cache_init();
2325         if (error)
2326                 goto out_destroy_wq;
2327
2328         error = xfs_init_procfs();
2329         if (error)
2330                 goto out_mru_cache_uninit;
2331
2332         error = xfs_sysctl_register();
2333         if (error)
2334                 goto out_cleanup_procfs;
2335
2336         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2337         if (!xfs_kset) {
2338                 error = -ENOMEM;
2339                 goto out_sysctl_unregister;
2340         }
2341
2342         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2343
2344         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2345         if (!xfsstats.xs_stats) {
2346                 error = -ENOMEM;
2347                 goto out_kset_unregister;
2348         }
2349
2350         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2351                                "stats");
2352         if (error)
2353                 goto out_free_stats;
2354
2355 #ifdef DEBUG
2356         xfs_dbg_kobj.kobject.kset = xfs_kset;
2357         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2358         if (error)
2359                 goto out_remove_stats_kobj;
2360 #endif
2361
2362         error = xfs_qm_init();
2363         if (error)
2364                 goto out_remove_dbg_kobj;
2365
2366         error = register_filesystem(&xfs_fs_type);
2367         if (error)
2368                 goto out_qm_exit;
2369         return 0;
2370
2371  out_qm_exit:
2372         xfs_qm_exit();
2373  out_remove_dbg_kobj:
2374 #ifdef DEBUG
2375         xfs_sysfs_del(&xfs_dbg_kobj);
2376  out_remove_stats_kobj:
2377 #endif
2378         xfs_sysfs_del(&xfsstats.xs_kobj);
2379  out_free_stats:
2380         free_percpu(xfsstats.xs_stats);
2381  out_kset_unregister:
2382         kset_unregister(xfs_kset);
2383  out_sysctl_unregister:
2384         xfs_sysctl_unregister();
2385  out_cleanup_procfs:
2386         xfs_cleanup_procfs();
2387  out_mru_cache_uninit:
2388         xfs_mru_cache_uninit();
2389  out_destroy_wq:
2390         xfs_destroy_workqueues();
2391  out_destroy_caches:
2392         xfs_destroy_caches();
2393  out_destroy_hp:
2394         xfs_cpu_hotplug_destroy();
2395  out:
2396         return error;
2397 }
2398
2399 STATIC void __exit
2400 exit_xfs_fs(void)
2401 {
2402         xfs_qm_exit();
2403         unregister_filesystem(&xfs_fs_type);
2404 #ifdef DEBUG
2405         xfs_sysfs_del(&xfs_dbg_kobj);
2406 #endif
2407         xfs_sysfs_del(&xfsstats.xs_kobj);
2408         free_percpu(xfsstats.xs_stats);
2409         kset_unregister(xfs_kset);
2410         xfs_sysctl_unregister();
2411         xfs_cleanup_procfs();
2412         xfs_mru_cache_uninit();
2413         xfs_destroy_workqueues();
2414         xfs_destroy_caches();
2415         xfs_uuid_table_free();
2416         xfs_cpu_hotplug_destroy();
2417 }
2418
2419 module_init(init_xfs_fs);
2420 module_exit(exit_xfs_fs);
2421
2422 MODULE_AUTHOR("Silicon Graphics, Inc.");
2423 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2424 MODULE_LICENSE("GPL");