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