fs/xfs/xfs_super.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6
   7 #include "xfs.h"
   8 #include "xfs_shared.h"
   9 #include "xfs_format.h"
  10 #include "xfs_log_format.h"
  11 #include "xfs_trans_resv.h"
  12 #include "xfs_sb.h"
  13 #include "xfs_mount.h"
  14 #include "xfs_inode.h"
  15 #include "xfs_btree.h"
  16 #include "xfs_bmap.h"
  17 #include "xfs_alloc.h"
  18 #include "xfs_fsops.h"
  19 #include "xfs_trans.h"
  20 #include "xfs_buf_item.h"
  21 #include "xfs_log.h"
  22 #include "xfs_log_priv.h"
  23 #include "xfs_dir2.h"
  24 #include "xfs_extfree_item.h"
  25 #include "xfs_mru_cache.h"
  26 #include "xfs_inode_item.h"
  27 #include "xfs_icache.h"
  28 #include "xfs_trace.h"
  29 #include "xfs_icreate_item.h"
  30 #include "xfs_filestream.h"
  31 #include "xfs_quota.h"
  32 #include "xfs_sysfs.h"
  33 #include "xfs_ondisk.h"
  34 #include "xfs_rmap_item.h"
  35 #include "xfs_refcount_item.h"
  36 #include "xfs_bmap_item.h"
  37 #include "xfs_reflink.h"
  38 #include "xfs_pwork.h"
  39 #include "xfs_ag.h"
  40
  41 #include <linux/magic.h>
  42 #include <linux/fs_context.h>
  43 #include <linux/fs_parser.h>
  44
  45 static const struct super_operations xfs_super_operations;
  46
  47 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
  48 #ifdef DEBUG
  49 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
  50 #endif
  51
  52 enum xfs_dax_mode {
  53         XFS_DAX_INODE = 0,
  54         XFS_DAX_ALWAYS = 1,
  55         XFS_DAX_NEVER = 2,
  56 };
  57
  58 static void
  59 xfs_mount_set_dax_mode(
  60         struct xfs_mount        *mp,
  61         enum xfs_dax_mode       mode)
  62 {
  63         switch (mode) {
  64         case XFS_DAX_INODE:
  65                 mp->m_flags &= ~(XFS_MOUNT_DAX_ALWAYS | XFS_MOUNT_DAX_NEVER);
  66                 break;
  67         case XFS_DAX_ALWAYS:
  68                 mp->m_flags |= XFS_MOUNT_DAX_ALWAYS;
  69                 mp->m_flags &= ~XFS_MOUNT_DAX_NEVER;
  70                 break;
  71         case XFS_DAX_NEVER:
  72                 mp->m_flags |= XFS_MOUNT_DAX_NEVER;
  73                 mp->m_flags &= ~XFS_MOUNT_DAX_ALWAYS;
  74                 break;
  75         }
  76 }
  77
  78 static const struct constant_table dax_param_enums[] = {
  79         {"inode",       XFS_DAX_INODE },
  80         {"always",      XFS_DAX_ALWAYS },
  81         {"never",       XFS_DAX_NEVER },
  82         {}
  83 };
  84
  85 /*
  86  * Table driven mount option parser.
  87  */
  88 enum {
  89         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev,
  90         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
  91         Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
  92         Opt_allocsize, Opt_norecovery, Opt_inode64, Opt_inode32, Opt_ikeep,
  93         Opt_noikeep, Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2,
  94         Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
  95         Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
  96         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
  97         Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum,
  98 };
  99
 100 static const struct fs_parameter_spec xfs_fs_parameters[] = {
 101         fsparam_u32("logbufs",          Opt_logbufs),
 102         fsparam_string("logbsize",      Opt_logbsize),
 103         fsparam_string("logdev",        Opt_logdev),
 104         fsparam_string("rtdev",         Opt_rtdev),
 105         fsparam_flag("wsync",           Opt_wsync),
 106         fsparam_flag("noalign",         Opt_noalign),
 107         fsparam_flag("swalloc",         Opt_swalloc),
 108         fsparam_u32("sunit",            Opt_sunit),
 109         fsparam_u32("swidth",           Opt_swidth),
 110         fsparam_flag("nouuid",          Opt_nouuid),
 111         fsparam_flag("grpid",           Opt_grpid),
 112         fsparam_flag("nogrpid",         Opt_nogrpid),
 113         fsparam_flag("bsdgroups",       Opt_bsdgroups),
 114         fsparam_flag("sysvgroups",      Opt_sysvgroups),
 115         fsparam_string("allocsize",     Opt_allocsize),
 116         fsparam_flag("norecovery",      Opt_norecovery),
 117         fsparam_flag("inode64",         Opt_inode64),
 118         fsparam_flag("inode32",         Opt_inode32),
 119         fsparam_flag("ikeep",           Opt_ikeep),
 120         fsparam_flag("noikeep",         Opt_noikeep),
 121         fsparam_flag("largeio",         Opt_largeio),
 122         fsparam_flag("nolargeio",       Opt_nolargeio),
 123         fsparam_flag("attr2",           Opt_attr2),
 124         fsparam_flag("noattr2",         Opt_noattr2),
 125         fsparam_flag("filestreams",     Opt_filestreams),
 126         fsparam_flag("quota",           Opt_quota),
 127         fsparam_flag("noquota",         Opt_noquota),
 128         fsparam_flag("usrquota",        Opt_usrquota),
 129         fsparam_flag("grpquota",        Opt_grpquota),
 130         fsparam_flag("prjquota",        Opt_prjquota),
 131         fsparam_flag("uquota",          Opt_uquota),
 132         fsparam_flag("gquota",          Opt_gquota),
 133         fsparam_flag("pquota",          Opt_pquota),
 134         fsparam_flag("uqnoenforce",     Opt_uqnoenforce),
 135         fsparam_flag("gqnoenforce",     Opt_gqnoenforce),
 136         fsparam_flag("pqnoenforce",     Opt_pqnoenforce),
 137         fsparam_flag("qnoenforce",      Opt_qnoenforce),
 138         fsparam_flag("discard",         Opt_discard),
 139         fsparam_flag("nodiscard",       Opt_nodiscard),
 140         fsparam_flag("dax",             Opt_dax),
 141         fsparam_enum("dax",             Opt_dax_enum, dax_param_enums),
 142         {}
 143 };
 144
 145 struct proc_xfs_info {
 146         uint64_t        flag;
 147         char            *str;
 148 };
 149
 150 static int
 151 xfs_fs_show_options(
 152         struct seq_file         *m,
 153         struct dentry           *root)
 154 {
 155         static struct proc_xfs_info xfs_info_set[] = {
 156                 /* the few simple ones we can get from the mount struct */
 157                 { XFS_MOUNT_IKEEP,              ",ikeep" },
 158                 { XFS_MOUNT_WSYNC,              ",wsync" },
 159                 { XFS_MOUNT_NOALIGN,            ",noalign" },
 160                 { XFS_MOUNT_SWALLOC,            ",swalloc" },
 161                 { XFS_MOUNT_NOUUID,             ",nouuid" },
 162                 { XFS_MOUNT_NORECOVERY,         ",norecovery" },
 163                 { XFS_MOUNT_ATTR2,              ",attr2" },
 164                 { XFS_MOUNT_FILESTREAMS,        ",filestreams" },
 165                 { XFS_MOUNT_GRPID,              ",grpid" },
 166                 { XFS_MOUNT_DISCARD,            ",discard" },
 167                 { XFS_MOUNT_LARGEIO,            ",largeio" },
 168                 { XFS_MOUNT_DAX_ALWAYS,         ",dax=always" },
 169                 { XFS_MOUNT_DAX_NEVER,          ",dax=never" },
 170                 { 0, NULL }
 171         };
 172         struct xfs_mount        *mp = XFS_M(root->d_sb);
 173         struct proc_xfs_info    *xfs_infop;
 174
 175         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
 176                 if (mp->m_flags & xfs_infop->flag)
 177                         seq_puts(m, xfs_infop->str);
 178         }
 179
 180         seq_printf(m, ",inode%d",
 181                 (mp->m_flags & XFS_MOUNT_SMALL_INUMS) ? 32 : 64);
 182
 183         if (mp->m_flags & XFS_MOUNT_ALLOCSIZE)
 184                 seq_printf(m, ",allocsize=%dk",
 185                            (1 << mp->m_allocsize_log) >> 10);
 186
 187         if (mp->m_logbufs > 0)
 188                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
 189         if (mp->m_logbsize > 0)
 190                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
 191
 192         if (mp->m_logname)
 193                 seq_show_option(m, "logdev", mp->m_logname);
 194         if (mp->m_rtname)
 195                 seq_show_option(m, "rtdev", mp->m_rtname);
 196
 197         if (mp->m_dalign > 0)
 198                 seq_printf(m, ",sunit=%d",
 199                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
 200         if (mp->m_swidth > 0)
 201                 seq_printf(m, ",swidth=%d",
 202                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
 203
 204         if (mp->m_qflags & XFS_UQUOTA_ACCT) {
 205                 if (mp->m_qflags & XFS_UQUOTA_ENFD)
 206                         seq_puts(m, ",usrquota");
 207                 else
 208                         seq_puts(m, ",uqnoenforce");
 209         }
 210
 211         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
 212                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
 213                         seq_puts(m, ",prjquota");
 214                 else
 215                         seq_puts(m, ",pqnoenforce");
 216         }
 217         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
 218                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
 219                         seq_puts(m, ",grpquota");
 220                 else
 221                         seq_puts(m, ",gqnoenforce");
 222         }
 223
 224         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
 225                 seq_puts(m, ",noquota");
 226
 227         return 0;
 228 }
 229
 230 /*
 231  * Set parameters for inode allocation heuristics, taking into account
 232  * filesystem size and inode32/inode64 mount options; i.e. specifically
 233  * whether or not XFS_MOUNT_SMALL_INUMS is set.
 234  *
 235  * Inode allocation patterns are altered only if inode32 is requested
 236  * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
 237  * If altered, XFS_MOUNT_32BITINODES is set as well.
 238  *
 239  * An agcount independent of that in the mount structure is provided
 240  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
 241  * to the potentially higher ag count.
 242  *
 243  * Returns the maximum AG index which may contain inodes.
 244  */
 245 xfs_agnumber_t
 246 xfs_set_inode_alloc(
 247         struct xfs_mount *mp,
 248         xfs_agnumber_t  agcount)
 249 {
 250         xfs_agnumber_t  index;
 251         xfs_agnumber_t  maxagi = 0;
 252         xfs_sb_t        *sbp = &mp->m_sb;
 253         xfs_agnumber_t  max_metadata;
 254         xfs_agino_t     agino;
 255         xfs_ino_t       ino;
 256
 257         /*
 258          * Calculate how much should be reserved for inodes to meet
 259          * the max inode percentage.  Used only for inode32.
 260          */
 261         if (M_IGEO(mp)->maxicount) {
 262                 uint64_t        icount;
 263
 264                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
 265                 do_div(icount, 100);
 266                 icount += sbp->sb_agblocks - 1;
 267                 do_div(icount, sbp->sb_agblocks);
 268                 max_metadata = icount;
 269         } else {
 270                 max_metadata = agcount;
 271         }
 272
 273         /* Get the last possible inode in the filesystem */
 274         agino = XFS_AGB_TO_AGINO(mp, sbp->sb_agblocks - 1);
 275         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
 276
 277         /*
 278          * If user asked for no more than 32-bit inodes, and the fs is
 279          * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
 280          * the allocator to accommodate the request.
 281          */
 282         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
 283                 mp->m_flags |= XFS_MOUNT_32BITINODES;
 284         else
 285                 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
 286
 287         for (index = 0; index < agcount; index++) {
 288                 struct xfs_perag        *pag;
 289
 290                 ino = XFS_AGINO_TO_INO(mp, index, agino);
 291
 292                 pag = xfs_perag_get(mp, index);
 293
 294                 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
 295                         if (ino > XFS_MAXINUMBER_32) {
 296                                 pag->pagi_inodeok = 0;
 297                                 pag->pagf_metadata = 0;
 298                         } else {
 299                                 pag->pagi_inodeok = 1;
 300                                 maxagi++;
 301                                 if (index < max_metadata)
 302                                         pag->pagf_metadata = 1;
 303                                 else
 304                                         pag->pagf_metadata = 0;
 305                         }
 306                 } else {
 307                         pag->pagi_inodeok = 1;
 308                         pag->pagf_metadata = 0;
 309                 }
 310
 311                 xfs_perag_put(pag);
 312         }
 313
 314         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
 315 }
 316
 317 STATIC int
 318 xfs_blkdev_get(
 319         xfs_mount_t             *mp,
 320         const char              *name,
 321         struct block_device     **bdevp)
 322 {
 323         int                     error = 0;
 324
 325         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
 326                                     mp);
 327         if (IS_ERR(*bdevp)) {
 328                 error = PTR_ERR(*bdevp);
 329                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
 330         }
 331
 332         return error;
 333 }
 334
 335 STATIC void
 336 xfs_blkdev_put(
 337         struct block_device     *bdev)
 338 {
 339         if (bdev)
 340                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 341 }
 342
 343 void
 344 xfs_blkdev_issue_flush(
 345         xfs_buftarg_t           *buftarg)
 346 {
 347         blkdev_issue_flush(buftarg->bt_bdev);
 348 }
 349
 350 STATIC void
 351 xfs_close_devices(
 352         struct xfs_mount        *mp)
 353 {
 354         struct dax_device *dax_ddev = mp->m_ddev_targp->bt_daxdev;
 355
 356         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 357                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
 358                 struct dax_device *dax_logdev = mp->m_logdev_targp->bt_daxdev;
 359
 360                 xfs_free_buftarg(mp->m_logdev_targp);
 361                 xfs_blkdev_put(logdev);
 362                 fs_put_dax(dax_logdev);
 363         }
 364         if (mp->m_rtdev_targp) {
 365                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
 366                 struct dax_device *dax_rtdev = mp->m_rtdev_targp->bt_daxdev;
 367
 368                 xfs_free_buftarg(mp->m_rtdev_targp);
 369                 xfs_blkdev_put(rtdev);
 370                 fs_put_dax(dax_rtdev);
 371         }
 372         xfs_free_buftarg(mp->m_ddev_targp);
 373         fs_put_dax(dax_ddev);
 374 }
 375
 376 /*
 377  * The file system configurations are:
 378  *      (1) device (partition) with data and internal log
 379  *      (2) logical volume with data and log subvolumes.
 380  *      (3) logical volume with data, log, and realtime subvolumes.
 381  *
 382  * We only have to handle opening the log and realtime volumes here if
 383  * they are present.  The data subvolume has already been opened by
 384  * get_sb_bdev() and is stored in sb->s_bdev.
 385  */
 386 STATIC int
 387 xfs_open_devices(
 388         struct xfs_mount        *mp)
 389 {
 390         struct block_device     *ddev = mp->m_super->s_bdev;
 391         struct dax_device       *dax_ddev = fs_dax_get_by_bdev(ddev);
 392         struct dax_device       *dax_logdev = NULL, *dax_rtdev = NULL;
 393         struct block_device     *logdev = NULL, *rtdev = NULL;
 394         int                     error;
 395
 396         /*
 397          * Open real time and log devices - order is important.
 398          */
 399         if (mp->m_logname) {
 400                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
 401                 if (error)
 402                         goto out;
 403                 dax_logdev = fs_dax_get_by_bdev(logdev);
 404         }
 405
 406         if (mp->m_rtname) {
 407                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
 408                 if (error)
 409                         goto out_close_logdev;
 410
 411                 if (rtdev == ddev || rtdev == logdev) {
 412                         xfs_warn(mp,
 413         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
 414                         error = -EINVAL;
 415                         goto out_close_rtdev;
 416                 }
 417                 dax_rtdev = fs_dax_get_by_bdev(rtdev);
 418         }
 419
 420         /*
 421          * Setup xfs_mount buffer target pointers
 422          */
 423         error = -ENOMEM;
 424         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, dax_ddev);
 425         if (!mp->m_ddev_targp)
 426                 goto out_close_rtdev;
 427
 428         if (rtdev) {
 429                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, dax_rtdev);
 430                 if (!mp->m_rtdev_targp)
 431                         goto out_free_ddev_targ;
 432         }
 433
 434         if (logdev && logdev != ddev) {
 435                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, dax_logdev);
 436                 if (!mp->m_logdev_targp)
 437                         goto out_free_rtdev_targ;
 438         } else {
 439                 mp->m_logdev_targp = mp->m_ddev_targp;
 440         }
 441
 442         return 0;
 443
 444  out_free_rtdev_targ:
 445         if (mp->m_rtdev_targp)
 446                 xfs_free_buftarg(mp->m_rtdev_targp);
 447  out_free_ddev_targ:
 448         xfs_free_buftarg(mp->m_ddev_targp);
 449  out_close_rtdev:
 450         xfs_blkdev_put(rtdev);
 451         fs_put_dax(dax_rtdev);
 452  out_close_logdev:
 453         if (logdev && logdev != ddev) {
 454                 xfs_blkdev_put(logdev);
 455                 fs_put_dax(dax_logdev);
 456         }
 457  out:
 458         fs_put_dax(dax_ddev);
 459         return error;
 460 }
 461
 462 /*
 463  * Setup xfs_mount buffer target pointers based on superblock
 464  */
 465 STATIC int
 466 xfs_setup_devices(
 467         struct xfs_mount        *mp)
 468 {
 469         int                     error;
 470
 471         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
 472         if (error)
 473                 return error;
 474
 475         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 476                 unsigned int    log_sector_size = BBSIZE;
 477
 478                 if (xfs_sb_version_hassector(&mp->m_sb))
 479                         log_sector_size = mp->m_sb.sb_logsectsize;
 480                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
 481                                             log_sector_size);
 482                 if (error)
 483                         return error;
 484         }
 485         if (mp->m_rtdev_targp) {
 486                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
 487                                             mp->m_sb.sb_sectsize);
 488                 if (error)
 489                         return error;
 490         }
 491
 492         return 0;
 493 }
 494
 495 STATIC int
 496 xfs_init_mount_workqueues(
 497         struct xfs_mount        *mp)
 498 {
 499         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
 500                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
 501                         1, mp->m_super->s_id);
 502         if (!mp->m_buf_workqueue)
 503                 goto out;
 504
 505         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
 506                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
 507                         0, mp->m_super->s_id);
 508         if (!mp->m_unwritten_workqueue)
 509                 goto out_destroy_buf;
 510
 511         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
 512                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_UNBOUND),
 513                         0, mp->m_super->s_id);
 514         if (!mp->m_cil_workqueue)
 515                 goto out_destroy_unwritten;
 516
 517         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
 518                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
 519                         0, mp->m_super->s_id);
 520         if (!mp->m_reclaim_workqueue)
 521                 goto out_destroy_cil;
 522
 523         mp->m_gc_workqueue = alloc_workqueue("xfs-gc/%s",
 524                         WQ_SYSFS | WQ_UNBOUND | WQ_FREEZABLE | WQ_MEM_RECLAIM,
 525                         0, mp->m_super->s_id);
 526         if (!mp->m_gc_workqueue)
 527                 goto out_destroy_reclaim;
 528
 529         mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s",
 530                         XFS_WQFLAGS(WQ_FREEZABLE), 0, mp->m_super->s_id);
 531         if (!mp->m_sync_workqueue)
 532                 goto out_destroy_eofb;
 533
 534         return 0;
 535
 536 out_destroy_eofb:
 537         destroy_workqueue(mp->m_gc_workqueue);
 538 out_destroy_reclaim:
 539         destroy_workqueue(mp->m_reclaim_workqueue);
 540 out_destroy_cil:
 541         destroy_workqueue(mp->m_cil_workqueue);
 542 out_destroy_unwritten:
 543         destroy_workqueue(mp->m_unwritten_workqueue);
 544 out_destroy_buf:
 545         destroy_workqueue(mp->m_buf_workqueue);
 546 out:
 547         return -ENOMEM;
 548 }
 549
 550 STATIC void
 551 xfs_destroy_mount_workqueues(
 552         struct xfs_mount        *mp)
 553 {
 554         destroy_workqueue(mp->m_sync_workqueue);
 555         destroy_workqueue(mp->m_gc_workqueue);
 556         destroy_workqueue(mp->m_reclaim_workqueue);
 557         destroy_workqueue(mp->m_cil_workqueue);
 558         destroy_workqueue(mp->m_unwritten_workqueue);
 559         destroy_workqueue(mp->m_buf_workqueue);
 560 }
 561
 562 static void
 563 xfs_flush_inodes_worker(
 564         struct work_struct      *work)
 565 {
 566         struct xfs_mount        *mp = container_of(work, struct xfs_mount,
 567                                                    m_flush_inodes_work);
 568         struct super_block      *sb = mp->m_super;
 569
 570         if (down_read_trylock(&sb->s_umount)) {
 571                 sync_inodes_sb(sb);
 572                 up_read(&sb->s_umount);
 573         }
 574 }
 575
 576 /*
 577  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
 578  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
 579  * for IO to complete so that we effectively throttle multiple callers to the
 580  * rate at which IO is completing.
 581  */
 582 void
 583 xfs_flush_inodes(
 584         struct xfs_mount        *mp)
 585 {
 586         /*
 587          * If flush_work() returns true then that means we waited for a flush
 588          * which was already in progress.  Don't bother running another scan.
 589          */
 590         if (flush_work(&mp->m_flush_inodes_work))
 591                 return;
 592
 593         queue_work(mp->m_sync_workqueue, &mp->m_flush_inodes_work);
 594         flush_work(&mp->m_flush_inodes_work);
 595 }
 596
 597 /* Catch misguided souls that try to use this interface on XFS */
 598 STATIC struct inode *
 599 xfs_fs_alloc_inode(
 600         struct super_block      *sb)
 601 {
 602         BUG();
 603         return NULL;
 604 }
 605
 606 #ifdef DEBUG
 607 static void
 608 xfs_check_delalloc(
 609         struct xfs_inode        *ip,
 610         int                     whichfork)
 611 {
 612         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
 613         struct xfs_bmbt_irec    got;
 614         struct xfs_iext_cursor  icur;
 615
 616         if (!ifp || !xfs_iext_lookup_extent(ip, ifp, 0, &icur, &got))
 617                 return;
 618         do {
 619                 if (isnullstartblock(got.br_startblock)) {
 620                         xfs_warn(ip->i_mount,
 621         "ino %llx %s fork has delalloc extent at [0x%llx:0x%llx]",
 622                                 ip->i_ino,
 623                                 whichfork == XFS_DATA_FORK ? "data" : "cow",
 624                                 got.br_startoff, got.br_blockcount);
 625                 }
 626         } while (xfs_iext_next_extent(ifp, &icur, &got));
 627 }
 628 #else
 629 #define xfs_check_delalloc(ip, whichfork)       do { } while (0)
 630 #endif
 631
 632 /*
 633  * Now that the generic code is guaranteed not to be accessing
 634  * the linux inode, we can inactivate and reclaim the inode.
 635  */
 636 STATIC void
 637 xfs_fs_destroy_inode(
 638         struct inode            *inode)
 639 {
 640         struct xfs_inode        *ip = XFS_I(inode);
 641
 642         trace_xfs_destroy_inode(ip);
 643
 644         ASSERT(!rwsem_is_locked(&inode->i_rwsem));
 645         XFS_STATS_INC(ip->i_mount, vn_rele);
 646         XFS_STATS_INC(ip->i_mount, vn_remove);
 647
 648         xfs_inactive(ip);
 649
 650         if (!XFS_FORCED_SHUTDOWN(ip->i_mount) && ip->i_delayed_blks) {
 651                 xfs_check_delalloc(ip, XFS_DATA_FORK);
 652                 xfs_check_delalloc(ip, XFS_COW_FORK);
 653                 ASSERT(0);
 654         }
 655
 656         XFS_STATS_INC(ip->i_mount, vn_reclaim);
 657
 658         /*
 659          * We should never get here with one of the reclaim flags already set.
 660          */
 661         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
 662         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
 663
 664         /*
 665          * We always use background reclaim here because even if the inode is
 666          * clean, it still may be under IO and hence we have wait for IO
 667          * completion to occur before we can reclaim the inode. The background
 668          * reclaim path handles this more efficiently than we can here, so
 669          * simply let background reclaim tear down all inodes.
 670          */
 671         xfs_inode_set_reclaim_tag(ip);
 672 }
 673
 674 static void
 675 xfs_fs_dirty_inode(
 676         struct inode                    *inode,
 677         int                             flag)
 678 {
 679         struct xfs_inode                *ip = XFS_I(inode);
 680         struct xfs_mount                *mp = ip->i_mount;
 681         struct xfs_trans                *tp;
 682
 683         if (!(inode->i_sb->s_flags & SB_LAZYTIME))
 684                 return;
 685         if (flag != I_DIRTY_SYNC || !(inode->i_state & I_DIRTY_TIME))
 686                 return;
 687
 688         if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
 689                 return;
 690         xfs_ilock(ip, XFS_ILOCK_EXCL);
 691         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 692         xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
 693         xfs_trans_commit(tp);
 694 }
 695
 696 /*
 697  * Slab object creation initialisation for the XFS inode.
 698  * This covers only the idempotent fields in the XFS inode;
 699  * all other fields need to be initialised on allocation
 700  * from the slab. This avoids the need to repeatedly initialise
 701  * fields in the xfs inode that left in the initialise state
 702  * when freeing the inode.
 703  */
 704 STATIC void
 705 xfs_fs_inode_init_once(
 706         void                    *inode)
 707 {
 708         struct xfs_inode        *ip = inode;
 709
 710         memset(ip, 0, sizeof(struct xfs_inode));
 711
 712         /* vfs inode */
 713         inode_init_once(VFS_I(ip));
 714
 715         /* xfs inode */
 716         atomic_set(&ip->i_pincount, 0);
 717         spin_lock_init(&ip->i_flags_lock);
 718
 719         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
 720                      "xfsino", ip->i_ino);
 721         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
 722                      "xfsino", ip->i_ino);
 723 }
 724
 725 /*
 726  * We do an unlocked check for XFS_IDONTCACHE here because we are already
 727  * serialised against cache hits here via the inode->i_lock and igrab() in
 728  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
 729  * racing with us, and it avoids needing to grab a spinlock here for every inode
 730  * we drop the final reference on.
 731  */
 732 STATIC int
 733 xfs_fs_drop_inode(
 734         struct inode            *inode)
 735 {
 736         struct xfs_inode        *ip = XFS_I(inode);
 737
 738         /*
 739          * If this unlinked inode is in the middle of recovery, don't
 740          * drop the inode just yet; log recovery will take care of
 741          * that.  See the comment for this inode flag.
 742          */
 743         if (ip->i_flags & XFS_IRECOVERY) {
 744                 ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED);
 745                 return 0;
 746         }
 747
 748         return generic_drop_inode(inode);
 749 }
 750
 751 static void
 752 xfs_mount_free(
 753         struct xfs_mount        *mp)
 754 {
 755         kfree(mp->m_rtname);
 756         kfree(mp->m_logname);
 757         kmem_free(mp);
 758 }
 759
 760 STATIC int
 761 xfs_fs_sync_fs(
 762         struct super_block      *sb,
 763         int                     wait)
 764 {
 765         struct xfs_mount        *mp = XFS_M(sb);
 766
 767         /*
 768          * Doing anything during the async pass would be counterproductive.
 769          */
 770         if (!wait)
 771                 return 0;
 772
 773         xfs_log_force(mp, XFS_LOG_SYNC);
 774         if (laptop_mode) {
 775                 /*
 776                  * The disk must be active because we're syncing.
 777                  * We schedule log work now (now that the disk is
 778                  * active) instead of later (when it might not be).
 779                  */
 780                 flush_delayed_work(&mp->m_log->l_work);
 781         }
 782
 783         return 0;
 784 }
 785
 786 STATIC int
 787 xfs_fs_statfs(
 788         struct dentry           *dentry,
 789         struct kstatfs          *statp)
 790 {
 791         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
 792         xfs_sb_t                *sbp = &mp->m_sb;
 793         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
 794         uint64_t                fakeinos, id;
 795         uint64_t                icount;
 796         uint64_t                ifree;
 797         uint64_t                fdblocks;
 798         xfs_extlen_t            lsize;
 799         int64_t                 ffree;
 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_blockgc_stop(mp);
 897         xfs_save_resvblks(mp);
 898         ret = xfs_log_quiesce(mp);
 899         memalloc_nofs_restore(flags);
 900         return ret;
 901 }
 902
 903 STATIC int
 904 xfs_fs_unfreeze(
 905         struct super_block      *sb)
 906 {
 907         struct xfs_mount        *mp = XFS_M(sb);
 908
 909         xfs_restore_resvblks(mp);
 910         xfs_log_work_queue(mp);
 911         xfs_blockgc_start(mp);
 912         return 0;
 913 }
 914
 915 /*
 916  * This function fills in xfs_mount_t fields based on mount args.
 917  * Note: the superblock _has_ now been read in.
 918  */
 919 STATIC int
 920 xfs_finish_flags(
 921         struct xfs_mount        *mp)
 922 {
 923         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
 924
 925         /* Fail a mount where the logbuf is smaller than the log stripe */
 926         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
 927                 if (mp->m_logbsize <= 0 &&
 928                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
 929                         mp->m_logbsize = mp->m_sb.sb_logsunit;
 930                 } else if (mp->m_logbsize > 0 &&
 931                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
 932                         xfs_warn(mp,
 933                 "logbuf size must be greater than or equal to log stripe size");
 934                         return -EINVAL;
 935                 }
 936         } else {
 937                 /* Fail a mount if the logbuf is larger than 32K */
 938                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
 939                         xfs_warn(mp,
 940                 "logbuf size for version 1 logs must be 16K or 32K");
 941                         return -EINVAL;
 942                 }
 943         }
 944
 945         /*
 946          * V5 filesystems always use attr2 format for attributes.
 947          */
 948         if (xfs_sb_version_hascrc(&mp->m_sb) &&
 949             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
 950                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
 951                              "attr2 is always enabled for V5 filesystems.");
 952                 return -EINVAL;
 953         }
 954
 955         /*
 956          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
 957          * told by noattr2 to turn it off
 958          */
 959         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
 960             !(mp->m_flags & XFS_MOUNT_NOATTR2))
 961                 mp->m_flags |= XFS_MOUNT_ATTR2;
 962
 963         /*
 964          * prohibit r/w mounts of read-only filesystems
 965          */
 966         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
 967                 xfs_warn(mp,
 968                         "cannot mount a read-only filesystem as read-write");
 969                 return -EROFS;
 970         }
 971
 972         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
 973             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
 974             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
 975                 xfs_warn(mp,
 976                   "Super block does not support project and group quota together");
 977                 return -EINVAL;
 978         }
 979
 980         return 0;
 981 }
 982
 983 static int
 984 xfs_init_percpu_counters(
 985         struct xfs_mount        *mp)
 986 {
 987         int             error;
 988
 989         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
 990         if (error)
 991                 return -ENOMEM;
 992
 993         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
 994         if (error)
 995                 goto free_icount;
 996
 997         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
 998         if (error)
 999                 goto free_ifree;
1000
1001         error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL);
1002         if (error)
1003                 goto free_fdblocks;
1004
1005         return 0;
1006
1007 free_fdblocks:
1008         percpu_counter_destroy(&mp->m_fdblocks);
1009 free_ifree:
1010         percpu_counter_destroy(&mp->m_ifree);
1011 free_icount:
1012         percpu_counter_destroy(&mp->m_icount);
1013         return -ENOMEM;
1014 }
1015
1016 void
1017 xfs_reinit_percpu_counters(
1018         struct xfs_mount        *mp)
1019 {
1020         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1021         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1022         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1023 }
1024
1025 static void
1026 xfs_destroy_percpu_counters(
1027         struct xfs_mount        *mp)
1028 {
1029         percpu_counter_destroy(&mp->m_icount);
1030         percpu_counter_destroy(&mp->m_ifree);
1031         percpu_counter_destroy(&mp->m_fdblocks);
1032         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
1033                percpu_counter_sum(&mp->m_delalloc_blks) == 0);
1034         percpu_counter_destroy(&mp->m_delalloc_blks);
1035 }
1036
1037 static void
1038 xfs_fs_put_super(
1039         struct super_block      *sb)
1040 {
1041         struct xfs_mount        *mp = XFS_M(sb);
1042
1043         /* if ->fill_super failed, we have no mount to tear down */
1044         if (!sb->s_fs_info)
1045                 return;
1046
1047         xfs_notice(mp, "Unmounting Filesystem");
1048         xfs_filestream_unmount(mp);
1049         xfs_unmountfs(mp);
1050
1051         xfs_freesb(mp);
1052         free_percpu(mp->m_stats.xs_stats);
1053         xfs_destroy_percpu_counters(mp);
1054         xfs_destroy_mount_workqueues(mp);
1055         xfs_close_devices(mp);
1056
1057         sb->s_fs_info = NULL;
1058         xfs_mount_free(mp);
1059 }
1060
1061 static long
1062 xfs_fs_nr_cached_objects(
1063         struct super_block      *sb,
1064         struct shrink_control   *sc)
1065 {
1066         /* Paranoia: catch incorrect calls during mount setup or teardown */
1067         if (WARN_ON_ONCE(!sb->s_fs_info))
1068                 return 0;
1069         return xfs_reclaim_inodes_count(XFS_M(sb));
1070 }
1071
1072 static long
1073 xfs_fs_free_cached_objects(
1074         struct super_block      *sb,
1075         struct shrink_control   *sc)
1076 {
1077         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1078 }
1079
1080 static const struct super_operations xfs_super_operations = {
1081         .alloc_inode            = xfs_fs_alloc_inode,
1082         .destroy_inode          = xfs_fs_destroy_inode,
1083         .dirty_inode            = xfs_fs_dirty_inode,
1084         .drop_inode             = xfs_fs_drop_inode,
1085         .put_super              = xfs_fs_put_super,
1086         .sync_fs                = xfs_fs_sync_fs,
1087         .freeze_fs              = xfs_fs_freeze,
1088         .unfreeze_fs            = xfs_fs_unfreeze,
1089         .statfs                 = xfs_fs_statfs,
1090         .show_options           = xfs_fs_show_options,
1091         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1092         .free_cached_objects    = xfs_fs_free_cached_objects,
1093 };
1094
1095 static int
1096 suffix_kstrtoint(
1097         const char      *s,
1098         unsigned int    base,
1099         int             *res)
1100 {
1101         int             last, shift_left_factor = 0, _res;
1102         char            *value;
1103         int             ret = 0;
1104
1105         value = kstrdup(s, GFP_KERNEL);
1106         if (!value)
1107                 return -ENOMEM;
1108
1109         last = strlen(value) - 1;
1110         if (value[last] == 'K' || value[last] == 'k') {
1111                 shift_left_factor = 10;
1112                 value[last] = '\0';
1113         }
1114         if (value[last] == 'M' || value[last] == 'm') {
1115                 shift_left_factor = 20;
1116                 value[last] = '\0';
1117         }
1118         if (value[last] == 'G' || value[last] == 'g') {
1119                 shift_left_factor = 30;
1120                 value[last] = '\0';
1121         }
1122
1123         if (kstrtoint(value, base, &_res))
1124                 ret = -EINVAL;
1125         kfree(value);
1126         *res = _res << shift_left_factor;
1127         return ret;
1128 }
1129
1130 static inline void
1131 xfs_fs_warn_deprecated(
1132         struct fs_context       *fc,
1133         struct fs_parameter     *param,
1134         uint64_t                flag,
1135         bool                    value)
1136 {
1137         /* Don't print the warning if reconfiguring and current mount point
1138          * already had the flag set
1139          */
1140         if ((fc->purpose & FS_CONTEXT_FOR_RECONFIGURE) &&
1141                         !!(XFS_M(fc->root->d_sb)->m_flags & flag) == value)
1142                 return;
1143         xfs_warn(fc->s_fs_info, "%s mount option is deprecated.", param->key);
1144 }
1145
1146 /*
1147  * Set mount state from a mount option.
1148  *
1149  * NOTE: mp->m_super is NULL here!
1150  */
1151 static int
1152 xfs_fs_parse_param(
1153         struct fs_context       *fc,
1154         struct fs_parameter     *param)
1155 {
1156         struct xfs_mount        *parsing_mp = fc->s_fs_info;
1157         struct fs_parse_result  result;
1158         int                     size = 0;
1159         int                     opt;
1160
1161         opt = fs_parse(fc, xfs_fs_parameters, param, &result);
1162         if (opt < 0)
1163                 return opt;
1164
1165         switch (opt) {
1166         case Opt_logbufs:
1167                 parsing_mp->m_logbufs = result.uint_32;
1168                 return 0;
1169         case Opt_logbsize:
1170                 if (suffix_kstrtoint(param->string, 10, &parsing_mp->m_logbsize))
1171                         return -EINVAL;
1172                 return 0;
1173         case Opt_logdev:
1174                 kfree(parsing_mp->m_logname);
1175                 parsing_mp->m_logname = kstrdup(param->string, GFP_KERNEL);
1176                 if (!parsing_mp->m_logname)
1177                         return -ENOMEM;
1178                 return 0;
1179         case Opt_rtdev:
1180                 kfree(parsing_mp->m_rtname);
1181                 parsing_mp->m_rtname = kstrdup(param->string, GFP_KERNEL);
1182                 if (!parsing_mp->m_rtname)
1183                         return -ENOMEM;
1184                 return 0;
1185         case Opt_allocsize:
1186                 if (suffix_kstrtoint(param->string, 10, &size))
1187                         return -EINVAL;
1188                 parsing_mp->m_allocsize_log = ffs(size) - 1;
1189                 parsing_mp->m_flags |= XFS_MOUNT_ALLOCSIZE;
1190                 return 0;
1191         case Opt_grpid:
1192         case Opt_bsdgroups:
1193                 parsing_mp->m_flags |= XFS_MOUNT_GRPID;
1194                 return 0;
1195         case Opt_nogrpid:
1196         case Opt_sysvgroups:
1197                 parsing_mp->m_flags &= ~XFS_MOUNT_GRPID;
1198                 return 0;
1199         case Opt_wsync:
1200                 parsing_mp->m_flags |= XFS_MOUNT_WSYNC;
1201                 return 0;
1202         case Opt_norecovery:
1203                 parsing_mp->m_flags |= XFS_MOUNT_NORECOVERY;
1204                 return 0;
1205         case Opt_noalign:
1206                 parsing_mp->m_flags |= XFS_MOUNT_NOALIGN;
1207                 return 0;
1208         case Opt_swalloc:
1209                 parsing_mp->m_flags |= XFS_MOUNT_SWALLOC;
1210                 return 0;
1211         case Opt_sunit:
1212                 parsing_mp->m_dalign = result.uint_32;
1213                 return 0;
1214         case Opt_swidth:
1215                 parsing_mp->m_swidth = result.uint_32;
1216                 return 0;
1217         case Opt_inode32:
1218                 parsing_mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1219                 return 0;
1220         case Opt_inode64:
1221                 parsing_mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1222                 return 0;
1223         case Opt_nouuid:
1224                 parsing_mp->m_flags |= XFS_MOUNT_NOUUID;
1225                 return 0;
1226         case Opt_largeio:
1227                 parsing_mp->m_flags |= XFS_MOUNT_LARGEIO;
1228                 return 0;
1229         case Opt_nolargeio:
1230                 parsing_mp->m_flags &= ~XFS_MOUNT_LARGEIO;
1231                 return 0;
1232         case Opt_filestreams:
1233                 parsing_mp->m_flags |= XFS_MOUNT_FILESTREAMS;
1234                 return 0;
1235         case Opt_noquota:
1236                 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
1237                 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
1238                 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
1239                 return 0;
1240         case Opt_quota:
1241         case Opt_uquota:
1242         case Opt_usrquota:
1243                 parsing_mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
1244                                  XFS_UQUOTA_ENFD);
1245                 return 0;
1246         case Opt_qnoenforce:
1247         case Opt_uqnoenforce:
1248                 parsing_mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
1249                 parsing_mp->m_qflags &= ~XFS_UQUOTA_ENFD;
1250                 return 0;
1251         case Opt_pquota:
1252         case Opt_prjquota:
1253                 parsing_mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
1254                                  XFS_PQUOTA_ENFD);
1255                 return 0;
1256         case Opt_pqnoenforce:
1257                 parsing_mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
1258                 parsing_mp->m_qflags &= ~XFS_PQUOTA_ENFD;
1259                 return 0;
1260         case Opt_gquota:
1261         case Opt_grpquota:
1262                 parsing_mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
1263                                  XFS_GQUOTA_ENFD);
1264                 return 0;
1265         case Opt_gqnoenforce:
1266                 parsing_mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
1267                 parsing_mp->m_qflags &= ~XFS_GQUOTA_ENFD;
1268                 return 0;
1269         case Opt_discard:
1270                 parsing_mp->m_flags |= XFS_MOUNT_DISCARD;
1271                 return 0;
1272         case Opt_nodiscard:
1273                 parsing_mp->m_flags &= ~XFS_MOUNT_DISCARD;
1274                 return 0;
1275 #ifdef CONFIG_FS_DAX
1276         case Opt_dax:
1277                 xfs_mount_set_dax_mode(parsing_mp, XFS_DAX_ALWAYS);
1278                 return 0;
1279         case Opt_dax_enum:
1280                 xfs_mount_set_dax_mode(parsing_mp, result.uint_32);
1281                 return 0;
1282 #endif
1283         /* Following mount options will be removed in September 2025 */
1284         case Opt_ikeep:
1285                 xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_IKEEP, true);
1286                 parsing_mp->m_flags |= XFS_MOUNT_IKEEP;
1287                 return 0;
1288         case Opt_noikeep:
1289                 xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_IKEEP, false);
1290                 parsing_mp->m_flags &= ~XFS_MOUNT_IKEEP;
1291                 return 0;
1292         case Opt_attr2:
1293                 xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_ATTR2, true);
1294                 parsing_mp->m_flags |= XFS_MOUNT_ATTR2;
1295                 return 0;
1296         case Opt_noattr2:
1297                 xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_NOATTR2, true);
1298                 parsing_mp->m_flags &= ~XFS_MOUNT_ATTR2;
1299                 parsing_mp->m_flags |= XFS_MOUNT_NOATTR2;
1300                 return 0;
1301         default:
1302                 xfs_warn(parsing_mp, "unknown mount option [%s].", param->key);
1303                 return -EINVAL;
1304         }
1305
1306         return 0;
1307 }
1308
1309 static int
1310 xfs_fs_validate_params(
1311         struct xfs_mount        *mp)
1312 {
1313         /*
1314          * no recovery flag requires a read-only mount
1315          */
1316         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
1317             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
1318                 xfs_warn(mp, "no-recovery mounts must be read-only.");
1319                 return -EINVAL;
1320         }
1321
1322         if ((mp->m_flags & XFS_MOUNT_NOALIGN) &&
1323             (mp->m_dalign || mp->m_swidth)) {
1324                 xfs_warn(mp,
1325         "sunit and swidth options incompatible with the noalign option");
1326                 return -EINVAL;
1327         }
1328
1329         if (!IS_ENABLED(CONFIG_XFS_QUOTA) && mp->m_qflags != 0) {
1330                 xfs_warn(mp, "quota support not available in this kernel.");
1331                 return -EINVAL;
1332         }
1333
1334         if ((mp->m_dalign && !mp->m_swidth) ||
1335             (!mp->m_dalign && mp->m_swidth)) {
1336                 xfs_warn(mp, "sunit and swidth must be specified together");
1337                 return -EINVAL;
1338         }
1339
1340         if (mp->m_dalign && (mp->m_swidth % mp->m_dalign != 0)) {
1341                 xfs_warn(mp,
1342         "stripe width (%d) must be a multiple of the stripe unit (%d)",
1343                         mp->m_swidth, mp->m_dalign);
1344                 return -EINVAL;
1345         }
1346
1347         if (mp->m_logbufs != -1 &&
1348             mp->m_logbufs != 0 &&
1349             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
1350              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
1351                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
1352                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
1353                 return -EINVAL;
1354         }
1355
1356         if (mp->m_logbsize != -1 &&
1357             mp->m_logbsize !=  0 &&
1358             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
1359              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
1360              !is_power_of_2(mp->m_logbsize))) {
1361                 xfs_warn(mp,
1362                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
1363                         mp->m_logbsize);
1364                 return -EINVAL;
1365         }
1366
1367         if ((mp->m_flags & XFS_MOUNT_ALLOCSIZE) &&
1368             (mp->m_allocsize_log > XFS_MAX_IO_LOG ||
1369              mp->m_allocsize_log < XFS_MIN_IO_LOG)) {
1370                 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
1371                         mp->m_allocsize_log, XFS_MIN_IO_LOG, XFS_MAX_IO_LOG);
1372                 return -EINVAL;
1373         }
1374
1375         return 0;
1376 }
1377
1378 static int
1379 xfs_fs_fill_super(
1380         struct super_block      *sb,
1381         struct fs_context       *fc)
1382 {
1383         struct xfs_mount        *mp = sb->s_fs_info;
1384         struct inode            *root;
1385         int                     flags = 0, error;
1386
1387         mp->m_super = sb;
1388
1389         error = xfs_fs_validate_params(mp);
1390         if (error)
1391                 goto out_free_names;
1392
1393         sb_min_blocksize(sb, BBSIZE);
1394         sb->s_xattr = xfs_xattr_handlers;
1395         sb->s_export_op = &xfs_export_operations;
1396 #ifdef CONFIG_XFS_QUOTA
1397         sb->s_qcop = &xfs_quotactl_operations;
1398         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1399 #endif
1400         sb->s_op = &xfs_super_operations;
1401
1402         /*
1403          * Delay mount work if the debug hook is set. This is debug
1404          * instrumention to coordinate simulation of xfs mount failures with
1405          * VFS superblock operations
1406          */
1407         if (xfs_globals.mount_delay) {
1408                 xfs_notice(mp, "Delaying mount for %d seconds.",
1409                         xfs_globals.mount_delay);
1410                 msleep(xfs_globals.mount_delay * 1000);
1411         }
1412
1413         if (fc->sb_flags & SB_SILENT)
1414                 flags |= XFS_MFSI_QUIET;
1415
1416         error = xfs_open_devices(mp);
1417         if (error)
1418                 goto out_free_names;
1419
1420         error = xfs_init_mount_workqueues(mp);
1421         if (error)
1422                 goto out_close_devices;
1423
1424         error = xfs_init_percpu_counters(mp);
1425         if (error)
1426                 goto out_destroy_workqueues;
1427
1428         /* Allocate stats memory before we do operations that might use it */
1429         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1430         if (!mp->m_stats.xs_stats) {
1431                 error = -ENOMEM;
1432                 goto out_destroy_counters;
1433         }
1434
1435         error = xfs_readsb(mp, flags);
1436         if (error)
1437                 goto out_free_stats;
1438
1439         error = xfs_finish_flags(mp);
1440         if (error)
1441                 goto out_free_sb;
1442
1443         error = xfs_setup_devices(mp);
1444         if (error)
1445                 goto out_free_sb;
1446
1447         /* V4 support is undergoing deprecation. */
1448         if (!xfs_sb_version_hascrc(&mp->m_sb)) {
1449 #ifdef CONFIG_XFS_SUPPORT_V4
1450                 xfs_warn_once(mp,
1451         "Deprecated V4 format (crc=0) will not be supported after September 2030.");
1452 #else
1453                 xfs_warn(mp,
1454         "Deprecated V4 format (crc=0) not supported by kernel.");
1455                 error = -EINVAL;
1456                 goto out_free_sb;
1457 #endif
1458         }
1459
1460         /* Filesystem claims it needs repair, so refuse the mount. */
1461         if (xfs_sb_version_needsrepair(&mp->m_sb)) {
1462                 xfs_warn(mp, "Filesystem needs repair.  Please run xfs_repair.");
1463                 error = -EFSCORRUPTED;
1464                 goto out_free_sb;
1465         }
1466
1467         /*
1468          * Don't touch the filesystem if a user tool thinks it owns the primary
1469          * superblock.  mkfs doesn't clear the flag from secondary supers, so
1470          * we don't check them at all.
1471          */
1472         if (mp->m_sb.sb_inprogress) {
1473                 xfs_warn(mp, "Offline file system operation in progress!");
1474                 error = -EFSCORRUPTED;
1475                 goto out_free_sb;
1476         }
1477
1478         /*
1479          * Until this is fixed only page-sized or smaller data blocks work.
1480          */
1481         if (mp->m_sb.sb_blocksize > PAGE_SIZE) {
1482                 xfs_warn(mp,
1483                 "File system with blocksize %d bytes. "
1484                 "Only pagesize (%ld) or less will currently work.",
1485                                 mp->m_sb.sb_blocksize, PAGE_SIZE);
1486                 error = -ENOSYS;
1487                 goto out_free_sb;
1488         }
1489
1490         /* Ensure this filesystem fits in the page cache limits */
1491         if (xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_dblocks) ||
1492             xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_rblocks)) {
1493                 xfs_warn(mp,
1494                 "file system too large to be mounted on this system.");
1495                 error = -EFBIG;
1496                 goto out_free_sb;
1497         }
1498
1499         /*
1500          * XFS block mappings use 54 bits to store the logical block offset.
1501          * This should suffice to handle the maximum file size that the VFS
1502          * supports (currently 2^63 bytes on 64-bit and ULONG_MAX << PAGE_SHIFT
1503          * bytes on 32-bit), but as XFS and VFS have gotten the s_maxbytes
1504          * calculation wrong on 32-bit kernels in the past, we'll add a WARN_ON
1505          * to check this assertion.
1506          *
1507          * Avoid integer overflow by comparing the maximum bmbt offset to the
1508          * maximum pagecache offset in units of fs blocks.
1509          */
1510         if (!xfs_verify_fileoff(mp, XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE))) {
1511                 xfs_warn(mp,
1512 "MAX_LFS_FILESIZE block offset (%llu) exceeds extent map maximum (%llu)!",
1513                          XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE),
1514                          XFS_MAX_FILEOFF);
1515                 error = -EINVAL;
1516                 goto out_free_sb;
1517         }
1518
1519         error = xfs_filestream_mount(mp);
1520         if (error)
1521                 goto out_free_sb;
1522
1523         /*
1524          * we must configure the block size in the superblock before we run the
1525          * full mount process as the mount process can lookup and cache inodes.
1526          */
1527         sb->s_magic = XFS_SUPER_MAGIC;
1528         sb->s_blocksize = mp->m_sb.sb_blocksize;
1529         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1530         sb->s_maxbytes = MAX_LFS_FILESIZE;
1531         sb->s_max_links = XFS_MAXLINK;
1532         sb->s_time_gran = 1;
1533         if (xfs_sb_version_hasbigtime(&mp->m_sb)) {
1534                 sb->s_time_min = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MIN);
1535                 sb->s_time_max = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MAX);
1536         } else {
1537                 sb->s_time_min = XFS_LEGACY_TIME_MIN;
1538                 sb->s_time_max = XFS_LEGACY_TIME_MAX;
1539         }
1540         trace_xfs_inode_timestamp_range(mp, sb->s_time_min, sb->s_time_max);
1541         sb->s_iflags |= SB_I_CGROUPWB;
1542
1543         set_posix_acl_flag(sb);
1544
1545         /* version 5 superblocks support inode version counters. */
1546         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1547                 sb->s_flags |= SB_I_VERSION;
1548
1549         if (xfs_sb_version_hasbigtime(&mp->m_sb))
1550                 xfs_warn(mp,
1551  "EXPERIMENTAL big timestamp feature in use. Use at your own risk!");
1552
1553         if (mp->m_flags & XFS_MOUNT_DAX_ALWAYS) {
1554                 bool rtdev_is_dax = false, datadev_is_dax;
1555
1556                 xfs_warn(mp,
1557                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1558
1559                 datadev_is_dax = bdev_dax_supported(mp->m_ddev_targp->bt_bdev,
1560                         sb->s_blocksize);
1561                 if (mp->m_rtdev_targp)
1562                         rtdev_is_dax = bdev_dax_supported(
1563                                 mp->m_rtdev_targp->bt_bdev, sb->s_blocksize);
1564                 if (!rtdev_is_dax && !datadev_is_dax) {
1565                         xfs_alert(mp,
1566                         "DAX unsupported by block device. Turning off DAX.");
1567                         xfs_mount_set_dax_mode(mp, XFS_DAX_NEVER);
1568                 }
1569                 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1570                         xfs_alert(mp,
1571                 "DAX and reflink cannot be used together!");
1572                         error = -EINVAL;
1573                         goto out_filestream_unmount;
1574                 }
1575         }
1576
1577         if (mp->m_flags & XFS_MOUNT_DISCARD) {
1578                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1579
1580                 if (!blk_queue_discard(q)) {
1581                         xfs_warn(mp, "mounting with \"discard\" option, but "
1582                                         "the device does not support discard");
1583                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
1584                 }
1585         }
1586
1587         if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1588                 if (mp->m_sb.sb_rblocks) {
1589                         xfs_alert(mp,
1590         "reflink not compatible with realtime device!");
1591                         error = -EINVAL;
1592                         goto out_filestream_unmount;
1593                 }
1594
1595                 if (xfs_globals.always_cow) {
1596                         xfs_info(mp, "using DEBUG-only always_cow mode.");
1597                         mp->m_always_cow = true;
1598                 }
1599         }
1600
1601         if (xfs_sb_version_hasrmapbt(&mp->m_sb) && mp->m_sb.sb_rblocks) {
1602                 xfs_alert(mp,
1603         "reverse mapping btree not compatible with realtime device!");
1604                 error = -EINVAL;
1605                 goto out_filestream_unmount;
1606         }
1607
1608         if (xfs_sb_version_hasinobtcounts(&mp->m_sb))
1609                 xfs_warn(mp,
1610  "EXPERIMENTAL inode btree counters feature in use. Use at your own risk!");
1611
1612         error = xfs_mountfs(mp);
1613         if (error)
1614                 goto out_filestream_unmount;
1615
1616         root = igrab(VFS_I(mp->m_rootip));
1617         if (!root) {
1618                 error = -ENOENT;
1619                 goto out_unmount;
1620         }
1621         sb->s_root = d_make_root(root);
1622         if (!sb->s_root) {
1623                 error = -ENOMEM;
1624                 goto out_unmount;
1625         }
1626
1627         return 0;
1628
1629  out_filestream_unmount:
1630         xfs_filestream_unmount(mp);
1631  out_free_sb:
1632         xfs_freesb(mp);
1633  out_free_stats:
1634         free_percpu(mp->m_stats.xs_stats);
1635  out_destroy_counters:
1636         xfs_destroy_percpu_counters(mp);
1637  out_destroy_workqueues:
1638         xfs_destroy_mount_workqueues(mp);
1639  out_close_devices:
1640         xfs_close_devices(mp);
1641  out_free_names:
1642         sb->s_fs_info = NULL;
1643         xfs_mount_free(mp);
1644         return error;
1645
1646  out_unmount:
1647         xfs_filestream_unmount(mp);
1648         xfs_unmountfs(mp);
1649         goto out_free_sb;
1650 }
1651
1652 static int
1653 xfs_fs_get_tree(
1654         struct fs_context       *fc)
1655 {
1656         return get_tree_bdev(fc, xfs_fs_fill_super);
1657 }
1658
1659 static int
1660 xfs_remount_rw(
1661         struct xfs_mount        *mp)
1662 {
1663         struct xfs_sb           *sbp = &mp->m_sb;
1664         int error;
1665
1666         if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1667                 xfs_warn(mp,
1668                         "ro->rw transition prohibited on norecovery mount");
1669                 return -EINVAL;
1670         }
1671
1672         if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1673             xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1674                 xfs_warn(mp,
1675         "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1676                         (sbp->sb_features_ro_compat &
1677                                 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1678                 return -EINVAL;
1679         }
1680
1681         mp->m_flags &= ~XFS_MOUNT_RDONLY;
1682
1683         /*
1684          * If this is the first remount to writeable state we might have some
1685          * superblock changes to update.
1686          */
1687         if (mp->m_update_sb) {
1688                 error = xfs_sync_sb(mp, false);
1689                 if (error) {
1690                         xfs_warn(mp, "failed to write sb changes");
1691                         return error;
1692                 }
1693                 mp->m_update_sb = false;
1694         }
1695
1696         /*
1697          * Fill out the reserve pool if it is empty. Use the stashed value if
1698          * it is non-zero, otherwise go with the default.
1699          */
1700         xfs_restore_resvblks(mp);
1701         xfs_log_work_queue(mp);
1702
1703         /* Recover any CoW blocks that never got remapped. */
1704         error = xfs_reflink_recover_cow(mp);
1705         if (error) {
1706                 xfs_err(mp,
1707                         "Error %d recovering leftover CoW allocations.", error);
1708                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1709                 return error;
1710         }
1711         xfs_blockgc_start(mp);
1712
1713         /* Create the per-AG metadata reservation pool .*/
1714         error = xfs_fs_reserve_ag_blocks(mp);
1715         if (error && error != -ENOSPC)
1716                 return error;
1717
1718         return 0;
1719 }
1720
1721 static int
1722 xfs_remount_ro(
1723         struct xfs_mount        *mp)
1724 {
1725         int error;
1726
1727         /*
1728          * Cancel background eofb scanning so it cannot race with the final
1729          * log force+buftarg wait and deadlock the remount.
1730          */
1731         xfs_blockgc_stop(mp);
1732
1733         /* Get rid of any leftover CoW reservations... */
1734         error = xfs_blockgc_free_space(mp, NULL);
1735         if (error) {
1736                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1737                 return error;
1738         }
1739
1740         /* Free the per-AG metadata reservation pool. */
1741         error = xfs_fs_unreserve_ag_blocks(mp);
1742         if (error) {
1743                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1744                 return error;
1745         }
1746
1747         /*
1748          * Before we sync the metadata, we need to free up the reserve block
1749          * pool so that the used block count in the superblock on disk is
1750          * correct at the end of the remount. Stash the current* reserve pool
1751          * size so that if we get remounted rw, we can return it to the same
1752          * size.
1753          */
1754         xfs_save_resvblks(mp);
1755
1756         xfs_log_clean(mp);
1757         mp->m_flags |= XFS_MOUNT_RDONLY;
1758
1759         return 0;
1760 }
1761
1762 /*
1763  * Logically we would return an error here to prevent users from believing
1764  * they might have changed mount options using remount which can't be changed.
1765  *
1766  * But unfortunately mount(8) adds all options from mtab and fstab to the mount
1767  * arguments in some cases so we can't blindly reject options, but have to
1768  * check for each specified option if it actually differs from the currently
1769  * set option and only reject it if that's the case.
1770  *
1771  * Until that is implemented we return success for every remount request, and
1772  * silently ignore all options that we can't actually change.
1773  */
1774 static int
1775 xfs_fs_reconfigure(
1776         struct fs_context *fc)
1777 {
1778         struct xfs_mount        *mp = XFS_M(fc->root->d_sb);
1779         struct xfs_mount        *new_mp = fc->s_fs_info;
1780         xfs_sb_t                *sbp = &mp->m_sb;
1781         int                     flags = fc->sb_flags;
1782         int                     error;
1783
1784         /* version 5 superblocks always support version counters. */
1785         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1786                 fc->sb_flags |= SB_I_VERSION;
1787
1788         error = xfs_fs_validate_params(new_mp);
1789         if (error)
1790                 return error;
1791
1792         sync_filesystem(mp->m_super);
1793
1794         /* inode32 -> inode64 */
1795         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) &&
1796             !(new_mp->m_flags & XFS_MOUNT_SMALL_INUMS)) {
1797                 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1798                 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1799         }
1800
1801         /* inode64 -> inode32 */
1802         if (!(mp->m_flags & XFS_MOUNT_SMALL_INUMS) &&
1803             (new_mp->m_flags & XFS_MOUNT_SMALL_INUMS)) {
1804                 mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1805                 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1806         }
1807
1808         /* ro -> rw */
1809         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(flags & SB_RDONLY)) {
1810                 error = xfs_remount_rw(mp);
1811                 if (error)
1812                         return error;
1813         }
1814
1815         /* rw -> ro */
1816         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (flags & SB_RDONLY)) {
1817                 error = xfs_remount_ro(mp);
1818                 if (error)
1819                         return error;
1820         }
1821
1822         return 0;
1823 }
1824
1825 static void xfs_fs_free(
1826         struct fs_context       *fc)
1827 {
1828         struct xfs_mount        *mp = fc->s_fs_info;
1829
1830         /*
1831          * mp is stored in the fs_context when it is initialized.
1832          * mp is transferred to the superblock on a successful mount,
1833          * but if an error occurs before the transfer we have to free
1834          * it here.
1835          */
1836         if (mp)
1837                 xfs_mount_free(mp);
1838 }
1839
1840 static const struct fs_context_operations xfs_context_ops = {
1841         .parse_param = xfs_fs_parse_param,
1842         .get_tree    = xfs_fs_get_tree,
1843         .reconfigure = xfs_fs_reconfigure,
1844         .free        = xfs_fs_free,
1845 };
1846
1847 static int xfs_init_fs_context(
1848         struct fs_context       *fc)
1849 {
1850         struct xfs_mount        *mp;
1851
1852         mp = kmem_alloc(sizeof(struct xfs_mount), KM_ZERO);
1853         if (!mp)
1854                 return -ENOMEM;
1855
1856         spin_lock_init(&mp->m_sb_lock);
1857         spin_lock_init(&mp->m_agirotor_lock);
1858         INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
1859         spin_lock_init(&mp->m_perag_lock);
1860         mutex_init(&mp->m_growlock);
1861         INIT_WORK(&mp->m_flush_inodes_work, xfs_flush_inodes_worker);
1862         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1863         mp->m_kobj.kobject.kset = xfs_kset;
1864         /*
1865          * We don't create the finobt per-ag space reservation until after log
1866          * recovery, so we must set this to true so that an ifree transaction
1867          * started during log recovery will not depend on space reservations
1868          * for finobt expansion.
1869          */
1870         mp->m_finobt_nores = true;
1871
1872         /*
1873          * These can be overridden by the mount option parsing.
1874          */
1875         mp->m_logbufs = -1;
1876         mp->m_logbsize = -1;
1877         mp->m_allocsize_log = 16; /* 64k */
1878
1879         /*
1880          * Copy binary VFS mount flags we are interested in.
1881          */
1882         if (fc->sb_flags & SB_RDONLY)
1883                 mp->m_flags |= XFS_MOUNT_RDONLY;
1884         if (fc->sb_flags & SB_DIRSYNC)
1885                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
1886         if (fc->sb_flags & SB_SYNCHRONOUS)
1887                 mp->m_flags |= XFS_MOUNT_WSYNC;
1888
1889         fc->s_fs_info = mp;
1890         fc->ops = &xfs_context_ops;
1891
1892         return 0;
1893 }
1894
1895 static struct file_system_type xfs_fs_type = {
1896         .owner                  = THIS_MODULE,
1897         .name                   = "xfs",
1898         .init_fs_context        = xfs_init_fs_context,
1899         .parameters             = xfs_fs_parameters,
1900         .kill_sb                = kill_block_super,
1901         .fs_flags               = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
1902 };
1903 MODULE_ALIAS_FS("xfs");
1904
1905 STATIC int __init
1906 xfs_init_zones(void)
1907 {
1908         xfs_log_ticket_zone = kmem_cache_create("xfs_log_ticket",
1909                                                 sizeof(struct xlog_ticket),
1910                                                 0, 0, NULL);
1911         if (!xfs_log_ticket_zone)
1912                 goto out;
1913
1914         xfs_bmap_free_item_zone = kmem_cache_create("xfs_bmap_free_item",
1915                                         sizeof(struct xfs_extent_free_item),
1916                                         0, 0, NULL);
1917         if (!xfs_bmap_free_item_zone)
1918                 goto out_destroy_log_ticket_zone;
1919
1920         xfs_btree_cur_zone = kmem_cache_create("xfs_btree_cur",
1921                                                sizeof(struct xfs_btree_cur),
1922                                                0, 0, NULL);
1923         if (!xfs_btree_cur_zone)
1924                 goto out_destroy_bmap_free_item_zone;
1925
1926         xfs_da_state_zone = kmem_cache_create("xfs_da_state",
1927                                               sizeof(struct xfs_da_state),
1928                                               0, 0, NULL);
1929         if (!xfs_da_state_zone)
1930                 goto out_destroy_btree_cur_zone;
1931
1932         xfs_ifork_zone = kmem_cache_create("xfs_ifork",
1933                                            sizeof(struct xfs_ifork),
1934                                            0, 0, NULL);
1935         if (!xfs_ifork_zone)
1936                 goto out_destroy_da_state_zone;
1937
1938         xfs_trans_zone = kmem_cache_create("xfs_trans",
1939                                            sizeof(struct xfs_trans),
1940                                            0, 0, NULL);
1941         if (!xfs_trans_zone)
1942                 goto out_destroy_ifork_zone;
1943
1944
1945         /*
1946          * The size of the zone allocated buf log item is the maximum
1947          * size possible under XFS.  This wastes a little bit of memory,
1948          * but it is much faster.
1949          */
1950         xfs_buf_item_zone = kmem_cache_create("xfs_buf_item",
1951                                               sizeof(struct xfs_buf_log_item),
1952                                               0, 0, NULL);
1953         if (!xfs_buf_item_zone)
1954                 goto out_destroy_trans_zone;
1955
1956         xfs_efd_zone = kmem_cache_create("xfs_efd_item",
1957                                         (sizeof(struct xfs_efd_log_item) +
1958                                         (XFS_EFD_MAX_FAST_EXTENTS - 1) *
1959                                         sizeof(struct xfs_extent)),
1960                                         0, 0, NULL);
1961         if (!xfs_efd_zone)
1962                 goto out_destroy_buf_item_zone;
1963
1964         xfs_efi_zone = kmem_cache_create("xfs_efi_item",
1965                                          (sizeof(struct xfs_efi_log_item) +
1966                                          (XFS_EFI_MAX_FAST_EXTENTS - 1) *
1967                                          sizeof(struct xfs_extent)),
1968                                          0, 0, NULL);
1969         if (!xfs_efi_zone)
1970                 goto out_destroy_efd_zone;
1971
1972         xfs_inode_zone = kmem_cache_create("xfs_inode",
1973                                            sizeof(struct xfs_inode), 0,
1974                                            (SLAB_HWCACHE_ALIGN |
1975                                             SLAB_RECLAIM_ACCOUNT |
1976                                             SLAB_MEM_SPREAD | SLAB_ACCOUNT),
1977                                            xfs_fs_inode_init_once);
1978         if (!xfs_inode_zone)
1979                 goto out_destroy_efi_zone;
1980
1981         xfs_ili_zone = kmem_cache_create("xfs_ili",
1982                                          sizeof(struct xfs_inode_log_item), 0,
1983                                          SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
1984                                          NULL);
1985         if (!xfs_ili_zone)
1986                 goto out_destroy_inode_zone;
1987
1988         xfs_icreate_zone = kmem_cache_create("xfs_icr",
1989                                              sizeof(struct xfs_icreate_item),
1990                                              0, 0, NULL);
1991         if (!xfs_icreate_zone)
1992                 goto out_destroy_ili_zone;
1993
1994         xfs_rud_zone = kmem_cache_create("xfs_rud_item",
1995                                          sizeof(struct xfs_rud_log_item),
1996                                          0, 0, NULL);
1997         if (!xfs_rud_zone)
1998                 goto out_destroy_icreate_zone;
1999
2000         xfs_rui_zone = kmem_cache_create("xfs_rui_item",
2001                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
2002                         0, 0, NULL);
2003         if (!xfs_rui_zone)
2004                 goto out_destroy_rud_zone;
2005
2006         xfs_cud_zone = kmem_cache_create("xfs_cud_item",
2007                                          sizeof(struct xfs_cud_log_item),
2008                                          0, 0, NULL);
2009         if (!xfs_cud_zone)
2010                 goto out_destroy_rui_zone;
2011
2012         xfs_cui_zone = kmem_cache_create("xfs_cui_item",
2013                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
2014                         0, 0, NULL);
2015         if (!xfs_cui_zone)
2016                 goto out_destroy_cud_zone;
2017
2018         xfs_bud_zone = kmem_cache_create("xfs_bud_item",
2019                                          sizeof(struct xfs_bud_log_item),
2020                                          0, 0, NULL);
2021         if (!xfs_bud_zone)
2022                 goto out_destroy_cui_zone;
2023
2024         xfs_bui_zone = kmem_cache_create("xfs_bui_item",
2025                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
2026                         0, 0, NULL);
2027         if (!xfs_bui_zone)
2028                 goto out_destroy_bud_zone;
2029
2030         return 0;
2031
2032  out_destroy_bud_zone:
2033         kmem_cache_destroy(xfs_bud_zone);
2034  out_destroy_cui_zone:
2035         kmem_cache_destroy(xfs_cui_zone);
2036  out_destroy_cud_zone:
2037         kmem_cache_destroy(xfs_cud_zone);
2038  out_destroy_rui_zone:
2039         kmem_cache_destroy(xfs_rui_zone);
2040  out_destroy_rud_zone:
2041         kmem_cache_destroy(xfs_rud_zone);
2042  out_destroy_icreate_zone:
2043         kmem_cache_destroy(xfs_icreate_zone);
2044  out_destroy_ili_zone:
2045         kmem_cache_destroy(xfs_ili_zone);
2046  out_destroy_inode_zone:
2047         kmem_cache_destroy(xfs_inode_zone);
2048  out_destroy_efi_zone:
2049         kmem_cache_destroy(xfs_efi_zone);
2050  out_destroy_efd_zone:
2051         kmem_cache_destroy(xfs_efd_zone);
2052  out_destroy_buf_item_zone:
2053         kmem_cache_destroy(xfs_buf_item_zone);
2054  out_destroy_trans_zone:
2055         kmem_cache_destroy(xfs_trans_zone);
2056  out_destroy_ifork_zone:
2057         kmem_cache_destroy(xfs_ifork_zone);
2058  out_destroy_da_state_zone:
2059         kmem_cache_destroy(xfs_da_state_zone);
2060  out_destroy_btree_cur_zone:
2061         kmem_cache_destroy(xfs_btree_cur_zone);
2062  out_destroy_bmap_free_item_zone:
2063         kmem_cache_destroy(xfs_bmap_free_item_zone);
2064  out_destroy_log_ticket_zone:
2065         kmem_cache_destroy(xfs_log_ticket_zone);
2066  out:
2067         return -ENOMEM;
2068 }
2069
2070 STATIC void
2071 xfs_destroy_zones(void)
2072 {
2073         /*
2074          * Make sure all delayed rcu free are flushed before we
2075          * destroy caches.
2076          */
2077         rcu_barrier();
2078         kmem_cache_destroy(xfs_bui_zone);
2079         kmem_cache_destroy(xfs_bud_zone);
2080         kmem_cache_destroy(xfs_cui_zone);
2081         kmem_cache_destroy(xfs_cud_zone);
2082         kmem_cache_destroy(xfs_rui_zone);
2083         kmem_cache_destroy(xfs_rud_zone);
2084         kmem_cache_destroy(xfs_icreate_zone);
2085         kmem_cache_destroy(xfs_ili_zone);
2086         kmem_cache_destroy(xfs_inode_zone);
2087         kmem_cache_destroy(xfs_efi_zone);
2088         kmem_cache_destroy(xfs_efd_zone);
2089         kmem_cache_destroy(xfs_buf_item_zone);
2090         kmem_cache_destroy(xfs_trans_zone);
2091         kmem_cache_destroy(xfs_ifork_zone);
2092         kmem_cache_destroy(xfs_da_state_zone);
2093         kmem_cache_destroy(xfs_btree_cur_zone);
2094         kmem_cache_destroy(xfs_bmap_free_item_zone);
2095         kmem_cache_destroy(xfs_log_ticket_zone);
2096 }
2097
2098 STATIC int __init
2099 xfs_init_workqueues(void)
2100 {
2101         /*
2102          * The allocation workqueue can be used in memory reclaim situations
2103          * (writepage path), and parallelism is only limited by the number of
2104          * AGs in all the filesystems mounted. Hence use the default large
2105          * max_active value for this workqueue.
2106          */
2107         xfs_alloc_wq = alloc_workqueue("xfsalloc",
2108                         XFS_WQFLAGS(WQ_MEM_RECLAIM | WQ_FREEZABLE), 0);
2109         if (!xfs_alloc_wq)
2110                 return -ENOMEM;
2111
2112         xfs_discard_wq = alloc_workqueue("xfsdiscard", XFS_WQFLAGS(WQ_UNBOUND),
2113                         0);
2114         if (!xfs_discard_wq)
2115                 goto out_free_alloc_wq;
2116
2117         return 0;
2118 out_free_alloc_wq:
2119         destroy_workqueue(xfs_alloc_wq);
2120         return -ENOMEM;
2121 }
2122
2123 STATIC void
2124 xfs_destroy_workqueues(void)
2125 {
2126         destroy_workqueue(xfs_discard_wq);
2127         destroy_workqueue(xfs_alloc_wq);
2128 }
2129
2130 STATIC int __init
2131 init_xfs_fs(void)
2132 {
2133         int                     error;
2134
2135         xfs_check_ondisk_structs();
2136
2137         printk(KERN_INFO XFS_VERSION_STRING " with "
2138                          XFS_BUILD_OPTIONS " enabled\n");
2139
2140         xfs_dir_startup();
2141
2142         error = xfs_init_zones();
2143         if (error)
2144                 goto out;
2145
2146         error = xfs_init_workqueues();
2147         if (error)
2148                 goto out_destroy_zones;
2149
2150         error = xfs_mru_cache_init();
2151         if (error)
2152                 goto out_destroy_wq;
2153
2154         error = xfs_buf_init();
2155         if (error)
2156                 goto out_mru_cache_uninit;
2157
2158         error = xfs_init_procfs();
2159         if (error)
2160                 goto out_buf_terminate;
2161
2162         error = xfs_sysctl_register();
2163         if (error)
2164                 goto out_cleanup_procfs;
2165
2166         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2167         if (!xfs_kset) {
2168                 error = -ENOMEM;
2169                 goto out_sysctl_unregister;
2170         }
2171
2172         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2173
2174         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2175         if (!xfsstats.xs_stats) {
2176                 error = -ENOMEM;
2177                 goto out_kset_unregister;
2178         }
2179
2180         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2181                                "stats");
2182         if (error)
2183                 goto out_free_stats;
2184
2185 #ifdef DEBUG
2186         xfs_dbg_kobj.kobject.kset = xfs_kset;
2187         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2188         if (error)
2189                 goto out_remove_stats_kobj;
2190 #endif
2191
2192         error = xfs_qm_init();
2193         if (error)
2194                 goto out_remove_dbg_kobj;
2195
2196         error = register_filesystem(&xfs_fs_type);
2197         if (error)
2198                 goto out_qm_exit;
2199         return 0;
2200
2201  out_qm_exit:
2202         xfs_qm_exit();
2203  out_remove_dbg_kobj:
2204 #ifdef DEBUG
2205         xfs_sysfs_del(&xfs_dbg_kobj);
2206  out_remove_stats_kobj:
2207 #endif
2208         xfs_sysfs_del(&xfsstats.xs_kobj);
2209  out_free_stats:
2210         free_percpu(xfsstats.xs_stats);
2211  out_kset_unregister:
2212         kset_unregister(xfs_kset);
2213  out_sysctl_unregister:
2214         xfs_sysctl_unregister();
2215  out_cleanup_procfs:
2216         xfs_cleanup_procfs();
2217  out_buf_terminate:
2218         xfs_buf_terminate();
2219  out_mru_cache_uninit:
2220         xfs_mru_cache_uninit();
2221  out_destroy_wq:
2222         xfs_destroy_workqueues();
2223  out_destroy_zones:
2224         xfs_destroy_zones();
2225  out:
2226         return error;
2227 }
2228
2229 STATIC void __exit
2230 exit_xfs_fs(void)
2231 {
2232         xfs_qm_exit();
2233         unregister_filesystem(&xfs_fs_type);
2234 #ifdef DEBUG
2235         xfs_sysfs_del(&xfs_dbg_kobj);
2236 #endif
2237         xfs_sysfs_del(&xfsstats.xs_kobj);
2238         free_percpu(xfsstats.xs_stats);
2239         kset_unregister(xfs_kset);
2240         xfs_sysctl_unregister();
2241         xfs_cleanup_procfs();
2242         xfs_buf_terminate();
2243         xfs_mru_cache_uninit();
2244         xfs_destroy_workqueues();
2245         xfs_destroy_zones();
2246         xfs_uuid_table_free();
2247 }
2248
2249 module_init(init_xfs_fs);
2250 module_exit(exit_xfs_fs);
2251
2252 MODULE_AUTHOR("Silicon Graphics, Inc.");
2253 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2254 MODULE_LICENSE("GPL");