fs/xfs/xfs_super.c

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