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                             flags)
 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
 654         /*
 655          * Only do the timestamp update if the inode is dirty (I_DIRTY_SYNC)
 656          * and has dirty timestamp (I_DIRTY_TIME). I_DIRTY_TIME can be passed
 657          * in flags possibly together with I_DIRTY_SYNC.
 658          */
 659         if ((flags & ~I_DIRTY_TIME) != I_DIRTY_SYNC || !(flags & I_DIRTY_TIME))
 660                 return;
 661
 662         if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
 663                 return;
 664         xfs_ilock(ip, XFS_ILOCK_EXCL);
 665         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 666         xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
 667         xfs_trans_commit(tp);
 668 }
 669
 670 /*
 671  * Slab object creation initialisation for the XFS inode.
 672  * This covers only the idempotent fields in the XFS inode;
 673  * all other fields need to be initialised on allocation
 674  * from the slab. This avoids the need to repeatedly initialise
 675  * fields in the xfs inode that left in the initialise state
 676  * when freeing the inode.
 677  */
 678 STATIC void
 679 xfs_fs_inode_init_once(
 680         void                    *inode)
 681 {
 682         struct xfs_inode        *ip = inode;
 683
 684         memset(ip, 0, sizeof(struct xfs_inode));
 685
 686         /* vfs inode */
 687         inode_init_once(VFS_I(ip));
 688
 689         /* xfs inode */
 690         atomic_set(&ip->i_pincount, 0);
 691         spin_lock_init(&ip->i_flags_lock);
 692
 693         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
 694                      "xfsino", ip->i_ino);
 695 }
 696
 697 /*
 698  * We do an unlocked check for XFS_IDONTCACHE here because we are already
 699  * serialised against cache hits here via the inode->i_lock and igrab() in
 700  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
 701  * racing with us, and it avoids needing to grab a spinlock here for every inode
 702  * we drop the final reference on.
 703  */
 704 STATIC int
 705 xfs_fs_drop_inode(
 706         struct inode            *inode)
 707 {
 708         struct xfs_inode        *ip = XFS_I(inode);
 709
 710         /*
 711          * If this unlinked inode is in the middle of recovery, don't
 712          * drop the inode just yet; log recovery will take care of
 713          * that.  See the comment for this inode flag.
 714          */
 715         if (ip->i_flags & XFS_IRECOVERY) {
 716                 ASSERT(xlog_recovery_needed(ip->i_mount->m_log));
 717                 return 0;
 718         }
 719
 720         return generic_drop_inode(inode);
 721 }
 722
 723 static void
 724 xfs_mount_free(
 725         struct xfs_mount        *mp)
 726 {
 727         kfree(mp->m_rtname);
 728         kfree(mp->m_logname);
 729         kmem_free(mp);
 730 }
 731
 732 STATIC int
 733 xfs_fs_sync_fs(
 734         struct super_block      *sb,
 735         int                     wait)
 736 {
 737         struct xfs_mount        *mp = XFS_M(sb);
 738         int                     error;
 739
 740         trace_xfs_fs_sync_fs(mp, __return_address);
 741
 742         /*
 743          * Doing anything during the async pass would be counterproductive.
 744          */
 745         if (!wait)
 746                 return 0;
 747
 748         error = xfs_log_force(mp, XFS_LOG_SYNC);
 749         if (error)
 750                 return error;
 751
 752         if (laptop_mode) {
 753                 /*
 754                  * The disk must be active because we're syncing.
 755                  * We schedule log work now (now that the disk is
 756                  * active) instead of later (when it might not be).
 757                  */
 758                 flush_delayed_work(&mp->m_log->l_work);
 759         }
 760
 761         /*
 762          * If we are called with page faults frozen out, it means we are about
 763          * to freeze the transaction subsystem. Take the opportunity to shut
 764          * down inodegc because once SB_FREEZE_FS is set it's too late to
 765          * prevent inactivation races with freeze. The fs doesn't get called
 766          * again by the freezing process until after SB_FREEZE_FS has been set,
 767          * so it's now or never.  Same logic applies to speculative allocation
 768          * garbage collection.
 769          *
 770          * We don't care if this is a normal syncfs call that does this or
 771          * freeze that does this - we can run this multiple times without issue
 772          * and we won't race with a restart because a restart can only occur
 773          * when the state is either SB_FREEZE_FS or SB_FREEZE_COMPLETE.
 774          */
 775         if (sb->s_writers.frozen == SB_FREEZE_PAGEFAULT) {
 776                 xfs_inodegc_stop(mp);
 777                 xfs_blockgc_stop(mp);
 778         }
 779
 780         return 0;
 781 }
 782
 783 STATIC int
 784 xfs_fs_statfs(
 785         struct dentry           *dentry,
 786         struct kstatfs          *statp)
 787 {
 788         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
 789         xfs_sb_t                *sbp = &mp->m_sb;
 790         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
 791         uint64_t                fakeinos, id;
 792         uint64_t                icount;
 793         uint64_t                ifree;
 794         uint64_t                fdblocks;
 795         xfs_extlen_t            lsize;
 796         int64_t                 ffree;
 797
 798         /*
 799          * Expedite background inodegc but don't wait. We do not want to block
 800          * here waiting hours for a billion extent file to be truncated.
 801          */
 802         xfs_inodegc_push(mp);
 803
 804         statp->f_type = XFS_SUPER_MAGIC;
 805         statp->f_namelen = MAXNAMELEN - 1;
 806
 807         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
 808         statp->f_fsid = u64_to_fsid(id);
 809
 810         icount = percpu_counter_sum(&mp->m_icount);
 811         ifree = percpu_counter_sum(&mp->m_ifree);
 812         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
 813
 814         spin_lock(&mp->m_sb_lock);
 815         statp->f_bsize = sbp->sb_blocksize;
 816         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
 817         statp->f_blocks = sbp->sb_dblocks - lsize;
 818         spin_unlock(&mp->m_sb_lock);
 819
 820         /* make sure statp->f_bfree does not underflow */
 821         statp->f_bfree = max_t(int64_t, fdblocks - mp->m_alloc_set_aside, 0);
 822         statp->f_bavail = statp->f_bfree;
 823
 824         fakeinos = XFS_FSB_TO_INO(mp, statp->f_bfree);
 825         statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
 826         if (M_IGEO(mp)->maxicount)
 827                 statp->f_files = min_t(typeof(statp->f_files),
 828                                         statp->f_files,
 829                                         M_IGEO(mp)->maxicount);
 830
 831         /* If sb_icount overshot maxicount, report actual allocation */
 832         statp->f_files = max_t(typeof(statp->f_files),
 833                                         statp->f_files,
 834                                         sbp->sb_icount);
 835
 836         /* make sure statp->f_ffree does not underflow */
 837         ffree = statp->f_files - (icount - ifree);
 838         statp->f_ffree = max_t(int64_t, ffree, 0);
 839
 840
 841         if ((ip->i_diflags & XFS_DIFLAG_PROJINHERIT) &&
 842             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
 843                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
 844                 xfs_qm_statvfs(ip, statp);
 845
 846         if (XFS_IS_REALTIME_MOUNT(mp) &&
 847             (ip->i_diflags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
 848                 statp->f_blocks = sbp->sb_rblocks;
 849                 statp->f_bavail = statp->f_bfree =
 850                         sbp->sb_frextents * sbp->sb_rextsize;
 851         }
 852
 853         return 0;
 854 }
 855
 856 STATIC void
 857 xfs_save_resvblks(struct xfs_mount *mp)
 858 {
 859         uint64_t resblks = 0;
 860
 861         mp->m_resblks_save = mp->m_resblks;
 862         xfs_reserve_blocks(mp, &resblks, NULL);
 863 }
 864
 865 STATIC void
 866 xfs_restore_resvblks(struct xfs_mount *mp)
 867 {
 868         uint64_t resblks;
 869
 870         if (mp->m_resblks_save) {
 871                 resblks = mp->m_resblks_save;
 872                 mp->m_resblks_save = 0;
 873         } else
 874                 resblks = xfs_default_resblks(mp);
 875
 876         xfs_reserve_blocks(mp, &resblks, NULL);
 877 }
 878
 879 /*
 880  * Second stage of a freeze. The data is already frozen so we only
 881  * need to take care of the metadata. Once that's done sync the superblock
 882  * to the log to dirty it in case of a crash while frozen. This ensures that we
 883  * will recover the unlinked inode lists on the next mount.
 884  */
 885 STATIC int
 886 xfs_fs_freeze(
 887         struct super_block      *sb)
 888 {
 889         struct xfs_mount        *mp = XFS_M(sb);
 890         unsigned int            flags;
 891         int                     ret;
 892
 893         /*
 894          * The filesystem is now frozen far enough that memory reclaim
 895          * cannot safely operate on the filesystem. Hence we need to
 896          * set a GFP_NOFS context here to avoid recursion deadlocks.
 897          */
 898         flags = memalloc_nofs_save();
 899         xfs_save_resvblks(mp);
 900         ret = xfs_log_quiesce(mp);
 901         memalloc_nofs_restore(flags);
 902
 903         /*
 904          * For read-write filesystems, we need to restart the inodegc on error
 905          * because we stopped it at SB_FREEZE_PAGEFAULT level and a thaw is not
 906          * going to be run to restart it now.  We are at SB_FREEZE_FS level
 907          * here, so we can restart safely without racing with a stop in
 908          * xfs_fs_sync_fs().
 909          */
 910         if (ret && !xfs_is_readonly(mp)) {
 911                 xfs_blockgc_start(mp);
 912                 xfs_inodegc_start(mp);
 913         }
 914
 915         return ret;
 916 }
 917
 918 STATIC int
 919 xfs_fs_unfreeze(
 920         struct super_block      *sb)
 921 {
 922         struct xfs_mount        *mp = XFS_M(sb);
 923
 924         xfs_restore_resvblks(mp);
 925         xfs_log_work_queue(mp);
 926
 927         /*
 928          * Don't reactivate the inodegc worker on a readonly filesystem because
 929          * inodes are sent directly to reclaim.  Don't reactivate the blockgc
 930          * worker because there are no speculative preallocations on a readonly
 931          * filesystem.
 932          */
 933         if (!xfs_is_readonly(mp)) {
 934                 xfs_blockgc_start(mp);
 935                 xfs_inodegc_start(mp);
 936         }
 937
 938         return 0;
 939 }
 940
 941 /*
 942  * This function fills in xfs_mount_t fields based on mount args.
 943  * Note: the superblock _has_ now been read in.
 944  */
 945 STATIC int
 946 xfs_finish_flags(
 947         struct xfs_mount        *mp)
 948 {
 949         /* Fail a mount where the logbuf is smaller than the log stripe */
 950         if (xfs_has_logv2(mp)) {
 951                 if (mp->m_logbsize <= 0 &&
 952                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
 953                         mp->m_logbsize = mp->m_sb.sb_logsunit;
 954                 } else if (mp->m_logbsize > 0 &&
 955                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
 956                         xfs_warn(mp,
 957                 "logbuf size must be greater than or equal to log stripe size");
 958                         return -EINVAL;
 959                 }
 960         } else {
 961                 /* Fail a mount if the logbuf is larger than 32K */
 962                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
 963                         xfs_warn(mp,
 964                 "logbuf size for version 1 logs must be 16K or 32K");
 965                         return -EINVAL;
 966                 }
 967         }
 968
 969         /*
 970          * V5 filesystems always use attr2 format for attributes.
 971          */
 972         if (xfs_has_crc(mp) && xfs_has_noattr2(mp)) {
 973                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
 974                              "attr2 is always enabled for V5 filesystems.");
 975                 return -EINVAL;
 976         }
 977
 978         /*
 979          * prohibit r/w mounts of read-only filesystems
 980          */
 981         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !xfs_is_readonly(mp)) {
 982                 xfs_warn(mp,
 983                         "cannot mount a read-only filesystem as read-write");
 984                 return -EROFS;
 985         }
 986
 987         if ((mp->m_qflags & XFS_GQUOTA_ACCT) &&
 988             (mp->m_qflags & XFS_PQUOTA_ACCT) &&
 989             !xfs_has_pquotino(mp)) {
 990                 xfs_warn(mp,
 991                   "Super block does not support project and group quota together");
 992                 return -EINVAL;
 993         }
 994
 995         return 0;
 996 }
 997
 998 static int
 999 xfs_init_percpu_counters(
1000         struct xfs_mount        *mp)
1001 {
1002         int             error;
1003
1004         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1005         if (error)
1006                 return -ENOMEM;
1007
1008         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1009         if (error)
1010                 goto free_icount;
1011
1012         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1013         if (error)
1014                 goto free_ifree;
1015
1016         error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL);
1017         if (error)
1018                 goto free_fdblocks;
1019
1020         return 0;
1021
1022 free_fdblocks:
1023         percpu_counter_destroy(&mp->m_fdblocks);
1024 free_ifree:
1025         percpu_counter_destroy(&mp->m_ifree);
1026 free_icount:
1027         percpu_counter_destroy(&mp->m_icount);
1028         return -ENOMEM;
1029 }
1030
1031 void
1032 xfs_reinit_percpu_counters(
1033         struct xfs_mount        *mp)
1034 {
1035         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1036         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1037         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1038 }
1039
1040 static void
1041 xfs_destroy_percpu_counters(
1042         struct xfs_mount        *mp)
1043 {
1044         percpu_counter_destroy(&mp->m_icount);
1045         percpu_counter_destroy(&mp->m_ifree);
1046         percpu_counter_destroy(&mp->m_fdblocks);
1047         ASSERT(xfs_is_shutdown(mp) ||
1048                percpu_counter_sum(&mp->m_delalloc_blks) == 0);
1049         percpu_counter_destroy(&mp->m_delalloc_blks);
1050 }
1051
1052 static int
1053 xfs_inodegc_init_percpu(
1054         struct xfs_mount        *mp)
1055 {
1056         struct xfs_inodegc      *gc;
1057         int                     cpu;
1058
1059         mp->m_inodegc = alloc_percpu(struct xfs_inodegc);
1060         if (!mp->m_inodegc)
1061                 return -ENOMEM;
1062
1063         for_each_possible_cpu(cpu) {
1064                 gc = per_cpu_ptr(mp->m_inodegc, cpu);
1065 #if defined(DEBUG) || defined(XFS_WARN)
1066                 gc->cpu = cpu;
1067 #endif
1068                 init_llist_head(&gc->list);
1069                 gc->items = 0;
1070                 INIT_DELAYED_WORK(&gc->work, xfs_inodegc_worker);
1071         }
1072         return 0;
1073 }
1074
1075 static void
1076 xfs_inodegc_free_percpu(
1077         struct xfs_mount        *mp)
1078 {
1079         if (!mp->m_inodegc)
1080                 return;
1081         free_percpu(mp->m_inodegc);
1082 }
1083
1084 static void
1085 xfs_fs_put_super(
1086         struct super_block      *sb)
1087 {
1088         struct xfs_mount        *mp = XFS_M(sb);
1089
1090         /* if ->fill_super failed, we have no mount to tear down */
1091         if (!sb->s_fs_info)
1092                 return;
1093
1094         xfs_notice(mp, "Unmounting Filesystem");
1095         xfs_filestream_unmount(mp);
1096         xfs_unmountfs(mp);
1097
1098         xfs_freesb(mp);
1099         free_percpu(mp->m_stats.xs_stats);
1100         xfs_mount_list_del(mp);
1101         xfs_inodegc_free_percpu(mp);
1102         xfs_destroy_percpu_counters(mp);
1103         xfs_destroy_mount_workqueues(mp);
1104         xfs_close_devices(mp);
1105
1106         sb->s_fs_info = NULL;
1107         xfs_mount_free(mp);
1108 }
1109
1110 static long
1111 xfs_fs_nr_cached_objects(
1112         struct super_block      *sb,
1113         struct shrink_control   *sc)
1114 {
1115         /* Paranoia: catch incorrect calls during mount setup or teardown */
1116         if (WARN_ON_ONCE(!sb->s_fs_info))
1117                 return 0;
1118         return xfs_reclaim_inodes_count(XFS_M(sb));
1119 }
1120
1121 static long
1122 xfs_fs_free_cached_objects(
1123         struct super_block      *sb,
1124         struct shrink_control   *sc)
1125 {
1126         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1127 }
1128
1129 static const struct super_operations xfs_super_operations = {
1130         .alloc_inode            = xfs_fs_alloc_inode,
1131         .destroy_inode          = xfs_fs_destroy_inode,
1132         .dirty_inode            = xfs_fs_dirty_inode,
1133         .drop_inode             = xfs_fs_drop_inode,
1134         .put_super              = xfs_fs_put_super,
1135         .sync_fs                = xfs_fs_sync_fs,
1136         .freeze_fs              = xfs_fs_freeze,
1137         .unfreeze_fs            = xfs_fs_unfreeze,
1138         .statfs                 = xfs_fs_statfs,
1139         .show_options           = xfs_fs_show_options,
1140         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1141         .free_cached_objects    = xfs_fs_free_cached_objects,
1142 };
1143
1144 static int
1145 suffix_kstrtoint(
1146         const char      *s,
1147         unsigned int    base,
1148         int             *res)
1149 {
1150         int             last, shift_left_factor = 0, _res;
1151         char            *value;
1152         int             ret = 0;
1153
1154         value = kstrdup(s, GFP_KERNEL);
1155         if (!value)
1156                 return -ENOMEM;
1157
1158         last = strlen(value) - 1;
1159         if (value[last] == 'K' || value[last] == 'k') {
1160                 shift_left_factor = 10;
1161                 value[last] = '\0';
1162         }
1163         if (value[last] == 'M' || value[last] == 'm') {
1164                 shift_left_factor = 20;
1165                 value[last] = '\0';
1166         }
1167         if (value[last] == 'G' || value[last] == 'g') {
1168                 shift_left_factor = 30;
1169                 value[last] = '\0';
1170         }
1171
1172         if (kstrtoint(value, base, &_res))
1173                 ret = -EINVAL;
1174         kfree(value);
1175         *res = _res << shift_left_factor;
1176         return ret;
1177 }
1178
1179 static inline void
1180 xfs_fs_warn_deprecated(
1181         struct fs_context       *fc,
1182         struct fs_parameter     *param,
1183         uint64_t                flag,
1184         bool                    value)
1185 {
1186         /* Don't print the warning if reconfiguring and current mount point
1187          * already had the flag set
1188          */
1189         if ((fc->purpose & FS_CONTEXT_FOR_RECONFIGURE) &&
1190             !!(XFS_M(fc->root->d_sb)->m_features & flag) == value)
1191                 return;
1192         xfs_warn(fc->s_fs_info, "%s mount option is deprecated.", param->key);
1193 }
1194
1195 /*
1196  * Set mount state from a mount option.
1197  *
1198  * NOTE: mp->m_super is NULL here!
1199  */
1200 static int
1201 xfs_fs_parse_param(
1202         struct fs_context       *fc,
1203         struct fs_parameter     *param)
1204 {
1205         struct xfs_mount        *parsing_mp = fc->s_fs_info;
1206         struct fs_parse_result  result;
1207         int                     size = 0;
1208         int                     opt;
1209
1210         opt = fs_parse(fc, xfs_fs_parameters, param, &result);
1211         if (opt < 0)
1212                 return opt;
1213
1214         switch (opt) {
1215         case Opt_logbufs:
1216                 parsing_mp->m_logbufs = result.uint_32;
1217                 return 0;
1218         case Opt_logbsize:
1219                 if (suffix_kstrtoint(param->string, 10, &parsing_mp->m_logbsize))
1220                         return -EINVAL;
1221                 return 0;
1222         case Opt_logdev:
1223                 kfree(parsing_mp->m_logname);
1224                 parsing_mp->m_logname = kstrdup(param->string, GFP_KERNEL);
1225                 if (!parsing_mp->m_logname)
1226                         return -ENOMEM;
1227                 return 0;
1228         case Opt_rtdev:
1229                 kfree(parsing_mp->m_rtname);
1230                 parsing_mp->m_rtname = kstrdup(param->string, GFP_KERNEL);
1231                 if (!parsing_mp->m_rtname)
1232                         return -ENOMEM;
1233                 return 0;
1234         case Opt_allocsize:
1235                 if (suffix_kstrtoint(param->string, 10, &size))
1236                         return -EINVAL;
1237                 parsing_mp->m_allocsize_log = ffs(size) - 1;
1238                 parsing_mp->m_features |= XFS_FEAT_ALLOCSIZE;
1239                 return 0;
1240         case Opt_grpid:
1241         case Opt_bsdgroups:
1242                 parsing_mp->m_features |= XFS_FEAT_GRPID;
1243                 return 0;
1244         case Opt_nogrpid:
1245         case Opt_sysvgroups:
1246                 parsing_mp->m_features &= ~XFS_FEAT_GRPID;
1247                 return 0;
1248         case Opt_wsync:
1249                 parsing_mp->m_features |= XFS_FEAT_WSYNC;
1250                 return 0;
1251         case Opt_norecovery:
1252                 parsing_mp->m_features |= XFS_FEAT_NORECOVERY;
1253                 return 0;
1254         case Opt_noalign:
1255                 parsing_mp->m_features |= XFS_FEAT_NOALIGN;
1256                 return 0;
1257         case Opt_swalloc:
1258                 parsing_mp->m_features |= XFS_FEAT_SWALLOC;
1259                 return 0;
1260         case Opt_sunit:
1261                 parsing_mp->m_dalign = result.uint_32;
1262                 return 0;
1263         case Opt_swidth:
1264                 parsing_mp->m_swidth = result.uint_32;
1265                 return 0;
1266         case Opt_inode32:
1267                 parsing_mp->m_features |= XFS_FEAT_SMALL_INUMS;
1268                 return 0;
1269         case Opt_inode64:
1270                 parsing_mp->m_features &= ~XFS_FEAT_SMALL_INUMS;
1271                 return 0;
1272         case Opt_nouuid:
1273                 parsing_mp->m_features |= XFS_FEAT_NOUUID;
1274                 return 0;
1275         case Opt_largeio:
1276                 parsing_mp->m_features |= XFS_FEAT_LARGE_IOSIZE;
1277                 return 0;
1278         case Opt_nolargeio:
1279                 parsing_mp->m_features &= ~XFS_FEAT_LARGE_IOSIZE;
1280                 return 0;
1281         case Opt_filestreams:
1282                 parsing_mp->m_features |= XFS_FEAT_FILESTREAMS;
1283                 return 0;
1284         case Opt_noquota:
1285                 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
1286                 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
1287                 return 0;
1288         case Opt_quota:
1289         case Opt_uquota:
1290         case Opt_usrquota:
1291                 parsing_mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ENFD);
1292                 return 0;
1293         case Opt_qnoenforce:
1294         case Opt_uqnoenforce:
1295                 parsing_mp->m_qflags |= XFS_UQUOTA_ACCT;
1296                 parsing_mp->m_qflags &= ~XFS_UQUOTA_ENFD;
1297                 return 0;
1298         case Opt_pquota:
1299         case Opt_prjquota:
1300                 parsing_mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ENFD);
1301                 return 0;
1302         case Opt_pqnoenforce:
1303                 parsing_mp->m_qflags |= XFS_PQUOTA_ACCT;
1304                 parsing_mp->m_qflags &= ~XFS_PQUOTA_ENFD;
1305                 return 0;
1306         case Opt_gquota:
1307         case Opt_grpquota:
1308                 parsing_mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ENFD);
1309                 return 0;
1310         case Opt_gqnoenforce:
1311                 parsing_mp->m_qflags |= XFS_GQUOTA_ACCT;
1312                 parsing_mp->m_qflags &= ~XFS_GQUOTA_ENFD;
1313                 return 0;
1314         case Opt_discard:
1315                 parsing_mp->m_features |= XFS_FEAT_DISCARD;
1316                 return 0;
1317         case Opt_nodiscard:
1318                 parsing_mp->m_features &= ~XFS_FEAT_DISCARD;
1319                 return 0;
1320 #ifdef CONFIG_FS_DAX
1321         case Opt_dax:
1322                 xfs_mount_set_dax_mode(parsing_mp, XFS_DAX_ALWAYS);
1323                 return 0;
1324         case Opt_dax_enum:
1325                 xfs_mount_set_dax_mode(parsing_mp, result.uint_32);
1326                 return 0;
1327 #endif
1328         /* Following mount options will be removed in September 2025 */
1329         case Opt_ikeep:
1330                 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_IKEEP, true);
1331                 parsing_mp->m_features |= XFS_FEAT_IKEEP;
1332                 return 0;
1333         case Opt_noikeep:
1334                 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_IKEEP, false);
1335                 parsing_mp->m_features &= ~XFS_FEAT_IKEEP;
1336                 return 0;
1337         case Opt_attr2:
1338                 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_ATTR2, true);
1339                 parsing_mp->m_features |= XFS_FEAT_ATTR2;
1340                 return 0;
1341         case Opt_noattr2:
1342                 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_NOATTR2, true);
1343                 parsing_mp->m_features |= XFS_FEAT_NOATTR2;
1344                 return 0;
1345         default:
1346                 xfs_warn(parsing_mp, "unknown mount option [%s].", param->key);
1347                 return -EINVAL;
1348         }
1349
1350         return 0;
1351 }
1352
1353 static int
1354 xfs_fs_validate_params(
1355         struct xfs_mount        *mp)
1356 {
1357         /* No recovery flag requires a read-only mount */
1358         if (xfs_has_norecovery(mp) && !xfs_is_readonly(mp)) {
1359                 xfs_warn(mp, "no-recovery mounts must be read-only.");
1360                 return -EINVAL;
1361         }
1362
1363         /*
1364          * We have not read the superblock at this point, so only the attr2
1365          * mount option can set the attr2 feature by this stage.
1366          */
1367         if (xfs_has_attr2(mp) && xfs_has_noattr2(mp)) {
1368                 xfs_warn(mp, "attr2 and noattr2 cannot both be specified.");
1369                 return -EINVAL;
1370         }
1371
1372
1373         if (xfs_has_noalign(mp) && (mp->m_dalign || mp->m_swidth)) {
1374                 xfs_warn(mp,
1375         "sunit and swidth options incompatible with the noalign option");
1376                 return -EINVAL;
1377         }
1378
1379         if (!IS_ENABLED(CONFIG_XFS_QUOTA) && mp->m_qflags != 0) {
1380                 xfs_warn(mp, "quota support not available in this kernel.");
1381                 return -EINVAL;
1382         }
1383
1384         if ((mp->m_dalign && !mp->m_swidth) ||
1385             (!mp->m_dalign && mp->m_swidth)) {
1386                 xfs_warn(mp, "sunit and swidth must be specified together");
1387                 return -EINVAL;
1388         }
1389
1390         if (mp->m_dalign && (mp->m_swidth % mp->m_dalign != 0)) {
1391                 xfs_warn(mp,
1392         "stripe width (%d) must be a multiple of the stripe unit (%d)",
1393                         mp->m_swidth, mp->m_dalign);
1394                 return -EINVAL;
1395         }
1396
1397         if (mp->m_logbufs != -1 &&
1398             mp->m_logbufs != 0 &&
1399             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
1400              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
1401                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
1402                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
1403                 return -EINVAL;
1404         }
1405
1406         if (mp->m_logbsize != -1 &&
1407             mp->m_logbsize !=  0 &&
1408             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
1409              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
1410              !is_power_of_2(mp->m_logbsize))) {
1411                 xfs_warn(mp,
1412                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
1413                         mp->m_logbsize);
1414                 return -EINVAL;
1415         }
1416
1417         if (xfs_has_allocsize(mp) &&
1418             (mp->m_allocsize_log > XFS_MAX_IO_LOG ||
1419              mp->m_allocsize_log < XFS_MIN_IO_LOG)) {
1420                 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
1421                         mp->m_allocsize_log, XFS_MIN_IO_LOG, XFS_MAX_IO_LOG);
1422                 return -EINVAL;
1423         }
1424
1425         return 0;
1426 }
1427
1428 static int
1429 xfs_fs_fill_super(
1430         struct super_block      *sb,
1431         struct fs_context       *fc)
1432 {
1433         struct xfs_mount        *mp = sb->s_fs_info;
1434         struct inode            *root;
1435         int                     flags = 0, error;
1436
1437         mp->m_super = sb;
1438
1439         error = xfs_fs_validate_params(mp);
1440         if (error)
1441                 goto out_free_names;
1442
1443         sb_min_blocksize(sb, BBSIZE);
1444         sb->s_xattr = xfs_xattr_handlers;
1445         sb->s_export_op = &xfs_export_operations;
1446 #ifdef CONFIG_XFS_QUOTA
1447         sb->s_qcop = &xfs_quotactl_operations;
1448         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1449 #endif
1450         sb->s_op = &xfs_super_operations;
1451
1452         /*
1453          * Delay mount work if the debug hook is set. This is debug
1454          * instrumention to coordinate simulation of xfs mount failures with
1455          * VFS superblock operations
1456          */
1457         if (xfs_globals.mount_delay) {
1458                 xfs_notice(mp, "Delaying mount for %d seconds.",
1459                         xfs_globals.mount_delay);
1460                 msleep(xfs_globals.mount_delay * 1000);
1461         }
1462
1463         if (fc->sb_flags & SB_SILENT)
1464                 flags |= XFS_MFSI_QUIET;
1465
1466         error = xfs_open_devices(mp);
1467         if (error)
1468                 goto out_free_names;
1469
1470         error = xfs_init_mount_workqueues(mp);
1471         if (error)
1472                 goto out_close_devices;
1473
1474         error = xfs_init_percpu_counters(mp);
1475         if (error)
1476                 goto out_destroy_workqueues;
1477
1478         error = xfs_inodegc_init_percpu(mp);
1479         if (error)
1480                 goto out_destroy_counters;
1481
1482         /*
1483          * All percpu data structures requiring cleanup when a cpu goes offline
1484          * must be allocated before adding this @mp to the cpu-dead handler's
1485          * mount list.
1486          */
1487         xfs_mount_list_add(mp);
1488
1489         /* Allocate stats memory before we do operations that might use it */
1490         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1491         if (!mp->m_stats.xs_stats) {
1492                 error = -ENOMEM;
1493                 goto out_destroy_inodegc;
1494         }
1495
1496         error = xfs_readsb(mp, flags);
1497         if (error)
1498                 goto out_free_stats;
1499
1500         error = xfs_finish_flags(mp);
1501         if (error)
1502                 goto out_free_sb;
1503
1504         error = xfs_setup_devices(mp);
1505         if (error)
1506                 goto out_free_sb;
1507
1508         /* V4 support is undergoing deprecation. */
1509         if (!xfs_has_crc(mp)) {
1510 #ifdef CONFIG_XFS_SUPPORT_V4
1511                 xfs_warn_once(mp,
1512         "Deprecated V4 format (crc=0) will not be supported after September 2030.");
1513 #else
1514                 xfs_warn(mp,
1515         "Deprecated V4 format (crc=0) not supported by kernel.");
1516                 error = -EINVAL;
1517                 goto out_free_sb;
1518 #endif
1519         }
1520
1521         /* Filesystem claims it needs repair, so refuse the mount. */
1522         if (xfs_has_needsrepair(mp)) {
1523                 xfs_warn(mp, "Filesystem needs repair.  Please run xfs_repair.");
1524                 error = -EFSCORRUPTED;
1525                 goto out_free_sb;
1526         }
1527
1528         /*
1529          * Don't touch the filesystem if a user tool thinks it owns the primary
1530          * superblock.  mkfs doesn't clear the flag from secondary supers, so
1531          * we don't check them at all.
1532          */
1533         if (mp->m_sb.sb_inprogress) {
1534                 xfs_warn(mp, "Offline file system operation in progress!");
1535                 error = -EFSCORRUPTED;
1536                 goto out_free_sb;
1537         }
1538
1539         /*
1540          * Until this is fixed only page-sized or smaller data blocks work.
1541          */
1542         if (mp->m_sb.sb_blocksize > PAGE_SIZE) {
1543                 xfs_warn(mp,
1544                 "File system with blocksize %d bytes. "
1545                 "Only pagesize (%ld) or less will currently work.",
1546                                 mp->m_sb.sb_blocksize, PAGE_SIZE);
1547                 error = -ENOSYS;
1548                 goto out_free_sb;
1549         }
1550
1551         /* Ensure this filesystem fits in the page cache limits */
1552         if (xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_dblocks) ||
1553             xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_rblocks)) {
1554                 xfs_warn(mp,
1555                 "file system too large to be mounted on this system.");
1556                 error = -EFBIG;
1557                 goto out_free_sb;
1558         }
1559
1560         /*
1561          * XFS block mappings use 54 bits to store the logical block offset.
1562          * This should suffice to handle the maximum file size that the VFS
1563          * supports (currently 2^63 bytes on 64-bit and ULONG_MAX << PAGE_SHIFT
1564          * bytes on 32-bit), but as XFS and VFS have gotten the s_maxbytes
1565          * calculation wrong on 32-bit kernels in the past, we'll add a WARN_ON
1566          * to check this assertion.
1567          *
1568          * Avoid integer overflow by comparing the maximum bmbt offset to the
1569          * maximum pagecache offset in units of fs blocks.
1570          */
1571         if (!xfs_verify_fileoff(mp, XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE))) {
1572                 xfs_warn(mp,
1573 "MAX_LFS_FILESIZE block offset (%llu) exceeds extent map maximum (%llu)!",
1574                          XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE),
1575                          XFS_MAX_FILEOFF);
1576                 error = -EINVAL;
1577                 goto out_free_sb;
1578         }
1579
1580         error = xfs_filestream_mount(mp);
1581         if (error)
1582                 goto out_free_sb;
1583
1584         /*
1585          * we must configure the block size in the superblock before we run the
1586          * full mount process as the mount process can lookup and cache inodes.
1587          */
1588         sb->s_magic = XFS_SUPER_MAGIC;
1589         sb->s_blocksize = mp->m_sb.sb_blocksize;
1590         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1591         sb->s_maxbytes = MAX_LFS_FILESIZE;
1592         sb->s_max_links = XFS_MAXLINK;
1593         sb->s_time_gran = 1;
1594         if (xfs_has_bigtime(mp)) {
1595                 sb->s_time_min = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MIN);
1596                 sb->s_time_max = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MAX);
1597         } else {
1598                 sb->s_time_min = XFS_LEGACY_TIME_MIN;
1599                 sb->s_time_max = XFS_LEGACY_TIME_MAX;
1600         }
1601         trace_xfs_inode_timestamp_range(mp, sb->s_time_min, sb->s_time_max);
1602         sb->s_iflags |= SB_I_CGROUPWB;
1603
1604         set_posix_acl_flag(sb);
1605
1606         /* version 5 superblocks support inode version counters. */
1607         if (xfs_has_crc(mp))
1608                 sb->s_flags |= SB_I_VERSION;
1609
1610         if (xfs_has_dax_always(mp)) {
1611                 bool rtdev_is_dax = false, datadev_is_dax;
1612
1613                 xfs_warn(mp,
1614                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1615
1616                 datadev_is_dax = xfs_buftarg_is_dax(sb, mp->m_ddev_targp);
1617                 if (mp->m_rtdev_targp)
1618                         rtdev_is_dax = xfs_buftarg_is_dax(sb,
1619                                                 mp->m_rtdev_targp);
1620                 if (!rtdev_is_dax && !datadev_is_dax) {
1621                         xfs_alert(mp,
1622                         "DAX unsupported by block device. Turning off DAX.");
1623                         xfs_mount_set_dax_mode(mp, XFS_DAX_NEVER);
1624                 }
1625                 if (xfs_has_reflink(mp)) {
1626                         xfs_alert(mp,
1627                 "DAX and reflink cannot be used together!");
1628                         error = -EINVAL;
1629                         goto out_filestream_unmount;
1630                 }
1631         }
1632
1633         if (xfs_has_discard(mp)) {
1634                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1635
1636                 if (!blk_queue_discard(q)) {
1637                         xfs_warn(mp, "mounting with \"discard\" option, but "
1638                                         "the device does not support discard");
1639                         mp->m_features &= ~XFS_FEAT_DISCARD;
1640                 }
1641         }
1642
1643         if (xfs_has_reflink(mp)) {
1644                 if (mp->m_sb.sb_rblocks) {
1645                         xfs_alert(mp,
1646         "reflink not compatible with realtime device!");
1647                         error = -EINVAL;
1648                         goto out_filestream_unmount;
1649                 }
1650
1651                 if (xfs_globals.always_cow) {
1652                         xfs_info(mp, "using DEBUG-only always_cow mode.");
1653                         mp->m_always_cow = true;
1654                 }
1655         }
1656
1657         if (xfs_has_rmapbt(mp) && mp->m_sb.sb_rblocks) {
1658                 xfs_alert(mp,
1659         "reverse mapping btree not compatible with realtime device!");
1660                 error = -EINVAL;
1661                 goto out_filestream_unmount;
1662         }
1663
1664         error = xfs_mountfs(mp);
1665         if (error)
1666                 goto out_filestream_unmount;
1667
1668         root = igrab(VFS_I(mp->m_rootip));
1669         if (!root) {
1670                 error = -ENOENT;
1671                 goto out_unmount;
1672         }
1673         sb->s_root = d_make_root(root);
1674         if (!sb->s_root) {
1675                 error = -ENOMEM;
1676                 goto out_unmount;
1677         }
1678
1679         return 0;
1680
1681  out_filestream_unmount:
1682         xfs_filestream_unmount(mp);
1683  out_free_sb:
1684         xfs_freesb(mp);
1685  out_free_stats:
1686         free_percpu(mp->m_stats.xs_stats);
1687  out_destroy_inodegc:
1688         xfs_mount_list_del(mp);
1689         xfs_inodegc_free_percpu(mp);
1690  out_destroy_counters:
1691         xfs_destroy_percpu_counters(mp);
1692  out_destroy_workqueues:
1693         xfs_destroy_mount_workqueues(mp);
1694  out_close_devices:
1695         xfs_close_devices(mp);
1696  out_free_names:
1697         sb->s_fs_info = NULL;
1698         xfs_mount_free(mp);
1699         return error;
1700
1701  out_unmount:
1702         xfs_filestream_unmount(mp);
1703         xfs_unmountfs(mp);
1704         goto out_free_sb;
1705 }
1706
1707 static int
1708 xfs_fs_get_tree(
1709         struct fs_context       *fc)
1710 {
1711         return get_tree_bdev(fc, xfs_fs_fill_super);
1712 }
1713
1714 static int
1715 xfs_remount_rw(
1716         struct xfs_mount        *mp)
1717 {
1718         struct xfs_sb           *sbp = &mp->m_sb;
1719         int error;
1720
1721         if (xfs_has_norecovery(mp)) {
1722                 xfs_warn(mp,
1723                         "ro->rw transition prohibited on norecovery mount");
1724                 return -EINVAL;
1725         }
1726
1727         if (xfs_sb_is_v5(sbp) &&
1728             xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1729                 xfs_warn(mp,
1730         "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1731                         (sbp->sb_features_ro_compat &
1732                                 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1733                 return -EINVAL;
1734         }
1735
1736         clear_bit(XFS_OPSTATE_READONLY, &mp->m_opstate);
1737
1738         /*
1739          * If this is the first remount to writeable state we might have some
1740          * superblock changes to update.
1741          */
1742         if (mp->m_update_sb) {
1743                 error = xfs_sync_sb(mp, false);
1744                 if (error) {
1745                         xfs_warn(mp, "failed to write sb changes");
1746                         return error;
1747                 }
1748                 mp->m_update_sb = false;
1749         }
1750
1751         /*
1752          * Fill out the reserve pool if it is empty. Use the stashed value if
1753          * it is non-zero, otherwise go with the default.
1754          */
1755         xfs_restore_resvblks(mp);
1756         xfs_log_work_queue(mp);
1757         xfs_blockgc_start(mp);
1758
1759         /* Create the per-AG metadata reservation pool .*/
1760         error = xfs_fs_reserve_ag_blocks(mp);
1761         if (error && error != -ENOSPC)
1762                 return error;
1763
1764         /* Re-enable the background inode inactivation worker. */
1765         xfs_inodegc_start(mp);
1766
1767         return 0;
1768 }
1769
1770 static int
1771 xfs_remount_ro(
1772         struct xfs_mount        *mp)
1773 {
1774         struct xfs_icwalk       icw = {
1775                 .icw_flags      = XFS_ICWALK_FLAG_SYNC,
1776         };
1777         int                     error;
1778
1779         /* Flush all the dirty data to disk. */
1780         error = sync_filesystem(mp->m_super);
1781         if (error)
1782                 return error;
1783
1784         /*
1785          * Cancel background eofb scanning so it cannot race with the final
1786          * log force+buftarg wait and deadlock the remount.
1787          */
1788         xfs_blockgc_stop(mp);
1789
1790         /*
1791          * Clear out all remaining COW staging extents and speculative post-EOF
1792          * preallocations so that we don't leave inodes requiring inactivation
1793          * cleanups during reclaim on a read-only mount.  We must process every
1794          * cached inode, so this requires a synchronous cache scan.
1795          */
1796         error = xfs_blockgc_free_space(mp, &icw);
1797         if (error) {
1798                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1799                 return error;
1800         }
1801
1802         /*
1803          * Stop the inodegc background worker.  xfs_fs_reconfigure already
1804          * flushed all pending inodegc work when it sync'd the filesystem.
1805          * The VFS holds s_umount, so we know that inodes cannot enter
1806          * xfs_fs_destroy_inode during a remount operation.  In readonly mode
1807          * we send inodes straight to reclaim, so no inodes will be queued.
1808          */
1809         xfs_inodegc_stop(mp);
1810
1811         /* Free the per-AG metadata reservation pool. */
1812         error = xfs_fs_unreserve_ag_blocks(mp);
1813         if (error) {
1814                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1815                 return error;
1816         }
1817
1818         /*
1819          * Before we sync the metadata, we need to free up the reserve block
1820          * pool so that the used block count in the superblock on disk is
1821          * correct at the end of the remount. Stash the current* reserve pool
1822          * size so that if we get remounted rw, we can return it to the same
1823          * size.
1824          */
1825         xfs_save_resvblks(mp);
1826
1827         xfs_log_clean(mp);
1828         set_bit(XFS_OPSTATE_READONLY, &mp->m_opstate);
1829
1830         return 0;
1831 }
1832
1833 /*
1834  * Logically we would return an error here to prevent users from believing
1835  * they might have changed mount options using remount which can't be changed.
1836  *
1837  * But unfortunately mount(8) adds all options from mtab and fstab to the mount
1838  * arguments in some cases so we can't blindly reject options, but have to
1839  * check for each specified option if it actually differs from the currently
1840  * set option and only reject it if that's the case.
1841  *
1842  * Until that is implemented we return success for every remount request, and
1843  * silently ignore all options that we can't actually change.
1844  */
1845 static int
1846 xfs_fs_reconfigure(
1847         struct fs_context *fc)
1848 {
1849         struct xfs_mount        *mp = XFS_M(fc->root->d_sb);
1850         struct xfs_mount        *new_mp = fc->s_fs_info;
1851         int                     flags = fc->sb_flags;
1852         int                     error;
1853
1854         /* version 5 superblocks always support version counters. */
1855         if (xfs_has_crc(mp))
1856                 fc->sb_flags |= SB_I_VERSION;
1857
1858         error = xfs_fs_validate_params(new_mp);
1859         if (error)
1860                 return error;
1861
1862         /* inode32 -> inode64 */
1863         if (xfs_has_small_inums(mp) && !xfs_has_small_inums(new_mp)) {
1864                 mp->m_features &= ~XFS_FEAT_SMALL_INUMS;
1865                 mp->m_maxagi = xfs_set_inode_alloc(mp, mp->m_sb.sb_agcount);
1866         }
1867
1868         /* inode64 -> inode32 */
1869         if (!xfs_has_small_inums(mp) && xfs_has_small_inums(new_mp)) {
1870                 mp->m_features |= XFS_FEAT_SMALL_INUMS;
1871                 mp->m_maxagi = xfs_set_inode_alloc(mp, mp->m_sb.sb_agcount);
1872         }
1873
1874         /* ro -> rw */
1875         if (xfs_is_readonly(mp) && !(flags & SB_RDONLY)) {
1876                 error = xfs_remount_rw(mp);
1877                 if (error)
1878                         return error;
1879         }
1880
1881         /* rw -> ro */
1882         if (!xfs_is_readonly(mp) && (flags & SB_RDONLY)) {
1883                 error = xfs_remount_ro(mp);
1884                 if (error)
1885                         return error;
1886         }
1887
1888         return 0;
1889 }
1890
1891 static void xfs_fs_free(
1892         struct fs_context       *fc)
1893 {
1894         struct xfs_mount        *mp = fc->s_fs_info;
1895
1896         /*
1897          * mp is stored in the fs_context when it is initialized.
1898          * mp is transferred to the superblock on a successful mount,
1899          * but if an error occurs before the transfer we have to free
1900          * it here.
1901          */
1902         if (mp)
1903                 xfs_mount_free(mp);
1904 }
1905
1906 static const struct fs_context_operations xfs_context_ops = {
1907         .parse_param = xfs_fs_parse_param,
1908         .get_tree    = xfs_fs_get_tree,
1909         .reconfigure = xfs_fs_reconfigure,
1910         .free        = xfs_fs_free,
1911 };
1912
1913 static int xfs_init_fs_context(
1914         struct fs_context       *fc)
1915 {
1916         struct xfs_mount        *mp;
1917
1918         mp = kmem_alloc(sizeof(struct xfs_mount), KM_ZERO);
1919         if (!mp)
1920                 return -ENOMEM;
1921
1922         spin_lock_init(&mp->m_sb_lock);
1923         spin_lock_init(&mp->m_agirotor_lock);
1924         INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
1925         spin_lock_init(&mp->m_perag_lock);
1926         mutex_init(&mp->m_growlock);
1927         INIT_WORK(&mp->m_flush_inodes_work, xfs_flush_inodes_worker);
1928         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1929         mp->m_kobj.kobject.kset = xfs_kset;
1930         /*
1931          * We don't create the finobt per-ag space reservation until after log
1932          * recovery, so we must set this to true so that an ifree transaction
1933          * started during log recovery will not depend on space reservations
1934          * for finobt expansion.
1935          */
1936         mp->m_finobt_nores = true;
1937
1938         /*
1939          * These can be overridden by the mount option parsing.
1940          */
1941         mp->m_logbufs = -1;
1942         mp->m_logbsize = -1;
1943         mp->m_allocsize_log = 16; /* 64k */
1944
1945         /*
1946          * Copy binary VFS mount flags we are interested in.
1947          */
1948         if (fc->sb_flags & SB_RDONLY)
1949                 set_bit(XFS_OPSTATE_READONLY, &mp->m_opstate);
1950         if (fc->sb_flags & SB_DIRSYNC)
1951                 mp->m_features |= XFS_FEAT_DIRSYNC;
1952         if (fc->sb_flags & SB_SYNCHRONOUS)
1953                 mp->m_features |= XFS_FEAT_WSYNC;
1954
1955         fc->s_fs_info = mp;
1956         fc->ops = &xfs_context_ops;
1957
1958         return 0;
1959 }
1960
1961 static struct file_system_type xfs_fs_type = {
1962         .owner                  = THIS_MODULE,
1963         .name                   = "xfs",
1964         .init_fs_context        = xfs_init_fs_context,
1965         .parameters             = xfs_fs_parameters,
1966         .kill_sb                = kill_block_super,
1967         .fs_flags               = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
1968 };
1969 MODULE_ALIAS_FS("xfs");
1970
1971 STATIC int __init
1972 xfs_init_zones(void)
1973 {
1974         xfs_log_ticket_zone = kmem_cache_create("xfs_log_ticket",
1975                                                 sizeof(struct xlog_ticket),
1976                                                 0, 0, NULL);
1977         if (!xfs_log_ticket_zone)
1978                 goto out;
1979
1980         xfs_bmap_free_item_zone = kmem_cache_create("xfs_bmap_free_item",
1981                                         sizeof(struct xfs_extent_free_item),
1982                                         0, 0, NULL);
1983         if (!xfs_bmap_free_item_zone)
1984                 goto out_destroy_log_ticket_zone;
1985
1986         xfs_btree_cur_zone = kmem_cache_create("xfs_btree_cur",
1987                                                sizeof(struct xfs_btree_cur),
1988                                                0, 0, NULL);
1989         if (!xfs_btree_cur_zone)
1990                 goto out_destroy_bmap_free_item_zone;
1991
1992         xfs_da_state_zone = kmem_cache_create("xfs_da_state",
1993                                               sizeof(struct xfs_da_state),
1994                                               0, 0, NULL);
1995         if (!xfs_da_state_zone)
1996                 goto out_destroy_btree_cur_zone;
1997
1998         xfs_ifork_zone = kmem_cache_create("xfs_ifork",
1999                                            sizeof(struct xfs_ifork),
2000                                            0, 0, NULL);
2001         if (!xfs_ifork_zone)
2002                 goto out_destroy_da_state_zone;
2003
2004         xfs_trans_zone = kmem_cache_create("xfs_trans",
2005                                            sizeof(struct xfs_trans),
2006                                            0, 0, NULL);
2007         if (!xfs_trans_zone)
2008                 goto out_destroy_ifork_zone;
2009
2010
2011         /*
2012          * The size of the zone allocated buf log item is the maximum
2013          * size possible under XFS.  This wastes a little bit of memory,
2014          * but it is much faster.
2015          */
2016         xfs_buf_item_zone = kmem_cache_create("xfs_buf_item",
2017                                               sizeof(struct xfs_buf_log_item),
2018                                               0, 0, NULL);
2019         if (!xfs_buf_item_zone)
2020                 goto out_destroy_trans_zone;
2021
2022         xfs_efd_zone = kmem_cache_create("xfs_efd_item",
2023                                         (sizeof(struct xfs_efd_log_item) +
2024                                         (XFS_EFD_MAX_FAST_EXTENTS - 1) *
2025                                         sizeof(struct xfs_extent)),
2026                                         0, 0, NULL);
2027         if (!xfs_efd_zone)
2028                 goto out_destroy_buf_item_zone;
2029
2030         xfs_efi_zone = kmem_cache_create("xfs_efi_item",
2031                                          (sizeof(struct xfs_efi_log_item) +
2032                                          (XFS_EFI_MAX_FAST_EXTENTS - 1) *
2033                                          sizeof(struct xfs_extent)),
2034                                          0, 0, NULL);
2035         if (!xfs_efi_zone)
2036                 goto out_destroy_efd_zone;
2037
2038         xfs_inode_zone = kmem_cache_create("xfs_inode",
2039                                            sizeof(struct xfs_inode), 0,
2040                                            (SLAB_HWCACHE_ALIGN |
2041                                             SLAB_RECLAIM_ACCOUNT |
2042                                             SLAB_MEM_SPREAD | SLAB_ACCOUNT),
2043                                            xfs_fs_inode_init_once);
2044         if (!xfs_inode_zone)
2045                 goto out_destroy_efi_zone;
2046
2047         xfs_ili_zone = kmem_cache_create("xfs_ili",
2048                                          sizeof(struct xfs_inode_log_item), 0,
2049                                          SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
2050                                          NULL);
2051         if (!xfs_ili_zone)
2052                 goto out_destroy_inode_zone;
2053
2054         xfs_icreate_zone = kmem_cache_create("xfs_icr",
2055                                              sizeof(struct xfs_icreate_item),
2056                                              0, 0, NULL);
2057         if (!xfs_icreate_zone)
2058                 goto out_destroy_ili_zone;
2059
2060         xfs_rud_zone = kmem_cache_create("xfs_rud_item",
2061                                          sizeof(struct xfs_rud_log_item),
2062                                          0, 0, NULL);
2063         if (!xfs_rud_zone)
2064                 goto out_destroy_icreate_zone;
2065
2066         xfs_rui_zone = kmem_cache_create("xfs_rui_item",
2067                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
2068                         0, 0, NULL);
2069         if (!xfs_rui_zone)
2070                 goto out_destroy_rud_zone;
2071
2072         xfs_cud_zone = kmem_cache_create("xfs_cud_item",
2073                                          sizeof(struct xfs_cud_log_item),
2074                                          0, 0, NULL);
2075         if (!xfs_cud_zone)
2076                 goto out_destroy_rui_zone;
2077
2078         xfs_cui_zone = kmem_cache_create("xfs_cui_item",
2079                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
2080                         0, 0, NULL);
2081         if (!xfs_cui_zone)
2082                 goto out_destroy_cud_zone;
2083
2084         xfs_bud_zone = kmem_cache_create("xfs_bud_item",
2085                                          sizeof(struct xfs_bud_log_item),
2086                                          0, 0, NULL);
2087         if (!xfs_bud_zone)
2088                 goto out_destroy_cui_zone;
2089
2090         xfs_bui_zone = kmem_cache_create("xfs_bui_item",
2091                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
2092                         0, 0, NULL);
2093         if (!xfs_bui_zone)
2094                 goto out_destroy_bud_zone;
2095
2096         return 0;
2097
2098  out_destroy_bud_zone:
2099         kmem_cache_destroy(xfs_bud_zone);
2100  out_destroy_cui_zone:
2101         kmem_cache_destroy(xfs_cui_zone);
2102  out_destroy_cud_zone:
2103         kmem_cache_destroy(xfs_cud_zone);
2104  out_destroy_rui_zone:
2105         kmem_cache_destroy(xfs_rui_zone);
2106  out_destroy_rud_zone:
2107         kmem_cache_destroy(xfs_rud_zone);
2108  out_destroy_icreate_zone:
2109         kmem_cache_destroy(xfs_icreate_zone);
2110  out_destroy_ili_zone:
2111         kmem_cache_destroy(xfs_ili_zone);
2112  out_destroy_inode_zone:
2113         kmem_cache_destroy(xfs_inode_zone);
2114  out_destroy_efi_zone:
2115         kmem_cache_destroy(xfs_efi_zone);
2116  out_destroy_efd_zone:
2117         kmem_cache_destroy(xfs_efd_zone);
2118  out_destroy_buf_item_zone:
2119         kmem_cache_destroy(xfs_buf_item_zone);
2120  out_destroy_trans_zone:
2121         kmem_cache_destroy(xfs_trans_zone);
2122  out_destroy_ifork_zone:
2123         kmem_cache_destroy(xfs_ifork_zone);
2124  out_destroy_da_state_zone:
2125         kmem_cache_destroy(xfs_da_state_zone);
2126  out_destroy_btree_cur_zone:
2127         kmem_cache_destroy(xfs_btree_cur_zone);
2128  out_destroy_bmap_free_item_zone:
2129         kmem_cache_destroy(xfs_bmap_free_item_zone);
2130  out_destroy_log_ticket_zone:
2131         kmem_cache_destroy(xfs_log_ticket_zone);
2132  out:
2133         return -ENOMEM;
2134 }
2135
2136 STATIC void
2137 xfs_destroy_zones(void)
2138 {
2139         /*
2140          * Make sure all delayed rcu free are flushed before we
2141          * destroy caches.
2142          */
2143         rcu_barrier();
2144         kmem_cache_destroy(xfs_bui_zone);
2145         kmem_cache_destroy(xfs_bud_zone);
2146         kmem_cache_destroy(xfs_cui_zone);
2147         kmem_cache_destroy(xfs_cud_zone);
2148         kmem_cache_destroy(xfs_rui_zone);
2149         kmem_cache_destroy(xfs_rud_zone);
2150         kmem_cache_destroy(xfs_icreate_zone);
2151         kmem_cache_destroy(xfs_ili_zone);
2152         kmem_cache_destroy(xfs_inode_zone);
2153         kmem_cache_destroy(xfs_efi_zone);
2154         kmem_cache_destroy(xfs_efd_zone);
2155         kmem_cache_destroy(xfs_buf_item_zone);
2156         kmem_cache_destroy(xfs_trans_zone);
2157         kmem_cache_destroy(xfs_ifork_zone);
2158         kmem_cache_destroy(xfs_da_state_zone);
2159         kmem_cache_destroy(xfs_btree_cur_zone);
2160         kmem_cache_destroy(xfs_bmap_free_item_zone);
2161         kmem_cache_destroy(xfs_log_ticket_zone);
2162 }
2163
2164 STATIC int __init
2165 xfs_init_workqueues(void)
2166 {
2167         /*
2168          * The allocation workqueue can be used in memory reclaim situations
2169          * (writepage path), and parallelism is only limited by the number of
2170          * AGs in all the filesystems mounted. Hence use the default large
2171          * max_active value for this workqueue.
2172          */
2173         xfs_alloc_wq = alloc_workqueue("xfsalloc",
2174                         XFS_WQFLAGS(WQ_MEM_RECLAIM | WQ_FREEZABLE), 0);
2175         if (!xfs_alloc_wq)
2176                 return -ENOMEM;
2177
2178         xfs_discard_wq = alloc_workqueue("xfsdiscard", XFS_WQFLAGS(WQ_UNBOUND),
2179                         0);
2180         if (!xfs_discard_wq)
2181                 goto out_free_alloc_wq;
2182
2183         return 0;
2184 out_free_alloc_wq:
2185         destroy_workqueue(xfs_alloc_wq);
2186         return -ENOMEM;
2187 }
2188
2189 STATIC void
2190 xfs_destroy_workqueues(void)
2191 {
2192         destroy_workqueue(xfs_discard_wq);
2193         destroy_workqueue(xfs_alloc_wq);
2194 }
2195
2196 #ifdef CONFIG_HOTPLUG_CPU
2197 static int
2198 xfs_cpu_dead(
2199         unsigned int            cpu)
2200 {
2201         struct xfs_mount        *mp, *n;
2202
2203         spin_lock(&xfs_mount_list_lock);
2204         list_for_each_entry_safe(mp, n, &xfs_mount_list, m_mount_list) {
2205                 spin_unlock(&xfs_mount_list_lock);
2206                 xfs_inodegc_cpu_dead(mp, cpu);
2207                 spin_lock(&xfs_mount_list_lock);
2208         }
2209         spin_unlock(&xfs_mount_list_lock);
2210         return 0;
2211 }
2212
2213 static int __init
2214 xfs_cpu_hotplug_init(void)
2215 {
2216         int     error;
2217
2218         error = cpuhp_setup_state_nocalls(CPUHP_XFS_DEAD, "xfs:dead", NULL,
2219                         xfs_cpu_dead);
2220         if (error < 0)
2221                 xfs_alert(NULL,
2222 "Failed to initialise CPU hotplug, error %d. XFS is non-functional.",
2223                         error);
2224         return error;
2225 }
2226
2227 static void
2228 xfs_cpu_hotplug_destroy(void)
2229 {
2230         cpuhp_remove_state_nocalls(CPUHP_XFS_DEAD);
2231 }
2232
2233 #else /* !CONFIG_HOTPLUG_CPU */
2234 static inline int xfs_cpu_hotplug_init(void) { return 0; }
2235 static inline void xfs_cpu_hotplug_destroy(void) {}
2236 #endif
2237
2238 STATIC int __init
2239 init_xfs_fs(void)
2240 {
2241         int                     error;
2242
2243         xfs_check_ondisk_structs();
2244
2245         printk(KERN_INFO XFS_VERSION_STRING " with "
2246                          XFS_BUILD_OPTIONS " enabled\n");
2247
2248         xfs_dir_startup();
2249
2250         error = xfs_cpu_hotplug_init();
2251         if (error)
2252                 goto out;
2253
2254         error = xfs_init_zones();
2255         if (error)
2256                 goto out_destroy_hp;
2257
2258         error = xfs_init_workqueues();
2259         if (error)
2260                 goto out_destroy_zones;
2261
2262         error = xfs_mru_cache_init();
2263         if (error)
2264                 goto out_destroy_wq;
2265
2266         error = xfs_buf_init();
2267         if (error)
2268                 goto out_mru_cache_uninit;
2269
2270         error = xfs_init_procfs();
2271         if (error)
2272                 goto out_buf_terminate;
2273
2274         error = xfs_sysctl_register();
2275         if (error)
2276                 goto out_cleanup_procfs;
2277
2278         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2279         if (!xfs_kset) {
2280                 error = -ENOMEM;
2281                 goto out_sysctl_unregister;
2282         }
2283
2284         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2285
2286         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2287         if (!xfsstats.xs_stats) {
2288                 error = -ENOMEM;
2289                 goto out_kset_unregister;
2290         }
2291
2292         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2293                                "stats");
2294         if (error)
2295                 goto out_free_stats;
2296
2297 #ifdef DEBUG
2298         xfs_dbg_kobj.kobject.kset = xfs_kset;
2299         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2300         if (error)
2301                 goto out_remove_stats_kobj;
2302 #endif
2303
2304         error = xfs_qm_init();
2305         if (error)
2306                 goto out_remove_dbg_kobj;
2307
2308         error = register_filesystem(&xfs_fs_type);
2309         if (error)
2310                 goto out_qm_exit;
2311         return 0;
2312
2313  out_qm_exit:
2314         xfs_qm_exit();
2315  out_remove_dbg_kobj:
2316 #ifdef DEBUG
2317         xfs_sysfs_del(&xfs_dbg_kobj);
2318  out_remove_stats_kobj:
2319 #endif
2320         xfs_sysfs_del(&xfsstats.xs_kobj);
2321  out_free_stats:
2322         free_percpu(xfsstats.xs_stats);
2323  out_kset_unregister:
2324         kset_unregister(xfs_kset);
2325  out_sysctl_unregister:
2326         xfs_sysctl_unregister();
2327  out_cleanup_procfs:
2328         xfs_cleanup_procfs();
2329  out_buf_terminate:
2330         xfs_buf_terminate();
2331  out_mru_cache_uninit:
2332         xfs_mru_cache_uninit();
2333  out_destroy_wq:
2334         xfs_destroy_workqueues();
2335  out_destroy_zones:
2336         xfs_destroy_zones();
2337  out_destroy_hp:
2338         xfs_cpu_hotplug_destroy();
2339  out:
2340         return error;
2341 }
2342
2343 STATIC void __exit
2344 exit_xfs_fs(void)
2345 {
2346         xfs_qm_exit();
2347         unregister_filesystem(&xfs_fs_type);
2348 #ifdef DEBUG
2349         xfs_sysfs_del(&xfs_dbg_kobj);
2350 #endif
2351         xfs_sysfs_del(&xfsstats.xs_kobj);
2352         free_percpu(xfsstats.xs_stats);
2353         kset_unregister(xfs_kset);
2354         xfs_sysctl_unregister();
2355         xfs_cleanup_procfs();
2356         xfs_buf_terminate();
2357         xfs_mru_cache_uninit();
2358         xfs_destroy_workqueues();
2359         xfs_destroy_zones();
2360         xfs_uuid_table_free();
2361         xfs_cpu_hotplug_destroy();
2362 }
2363
2364 module_init(init_xfs_fs);
2365 module_exit(exit_xfs_fs);
2366
2367 MODULE_AUTHOR("Silicon Graphics, Inc.");
2368 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2369 MODULE_LICENSE("GPL");