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