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
  40 #include <linux/magic.h>
  41 #include <linux/fs_context.h>
  42 #include <linux/fs_parser.h>
  43
  44 static const struct super_operations xfs_super_operations;
  45
  46 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
  47 #ifdef DEBUG
  48 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
  49 #endif
  50
  51 enum xfs_dax_mode {
  52         XFS_DAX_INODE = 0,
  53         XFS_DAX_ALWAYS = 1,
  54         XFS_DAX_NEVER = 2,
  55 };
  56
  57 static void
  58 xfs_mount_set_dax_mode(
  59         struct xfs_mount        *mp,
  60         enum xfs_dax_mode       mode)
  61 {
  62         switch (mode) {
  63         case XFS_DAX_INODE:
  64                 mp->m_flags &= ~(XFS_MOUNT_DAX_ALWAYS | XFS_MOUNT_DAX_NEVER);
  65                 break;
  66         case XFS_DAX_ALWAYS:
  67                 mp->m_flags |= XFS_MOUNT_DAX_ALWAYS;
  68                 mp->m_flags &= ~XFS_MOUNT_DAX_NEVER;
  69                 break;
  70         case XFS_DAX_NEVER:
  71                 mp->m_flags |= XFS_MOUNT_DAX_NEVER;
  72                 mp->m_flags &= ~XFS_MOUNT_DAX_ALWAYS;
  73                 break;
  74         }
  75 }
  76
  77 static const struct constant_table dax_param_enums[] = {
  78         {"inode",       XFS_DAX_INODE },
  79         {"always",      XFS_DAX_ALWAYS },
  80         {"never",       XFS_DAX_NEVER },
  81         {}
  82 };
  83
  84 /*
  85  * Table driven mount option parser.
  86  */
  87 enum {
  88         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev,
  89         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
  90         Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
  91         Opt_allocsize, Opt_norecovery, Opt_inode64, Opt_inode32, Opt_ikeep,
  92         Opt_noikeep, Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2,
  93         Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
  94         Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
  95         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
  96         Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum,
  97 };
  98
  99 static const struct fs_parameter_spec xfs_fs_parameters[] = {
 100         fsparam_u32("logbufs",          Opt_logbufs),
 101         fsparam_string("logbsize",      Opt_logbsize),
 102         fsparam_string("logdev",        Opt_logdev),
 103         fsparam_string("rtdev",         Opt_rtdev),
 104         fsparam_flag("wsync",           Opt_wsync),
 105         fsparam_flag("noalign",         Opt_noalign),
 106         fsparam_flag("swalloc",         Opt_swalloc),
 107         fsparam_u32("sunit",            Opt_sunit),
 108         fsparam_u32("swidth",           Opt_swidth),
 109         fsparam_flag("nouuid",          Opt_nouuid),
 110         fsparam_flag("grpid",           Opt_grpid),
 111         fsparam_flag("nogrpid",         Opt_nogrpid),
 112         fsparam_flag("bsdgroups",       Opt_bsdgroups),
 113         fsparam_flag("sysvgroups",      Opt_sysvgroups),
 114         fsparam_string("allocsize",     Opt_allocsize),
 115         fsparam_flag("norecovery",      Opt_norecovery),
 116         fsparam_flag("inode64",         Opt_inode64),
 117         fsparam_flag("inode32",         Opt_inode32),
 118         fsparam_flag("ikeep",           Opt_ikeep),
 119         fsparam_flag("noikeep",         Opt_noikeep),
 120         fsparam_flag("largeio",         Opt_largeio),
 121         fsparam_flag("nolargeio",       Opt_nolargeio),
 122         fsparam_flag("attr2",           Opt_attr2),
 123         fsparam_flag("noattr2",         Opt_noattr2),
 124         fsparam_flag("filestreams",     Opt_filestreams),
 125         fsparam_flag("quota",           Opt_quota),
 126         fsparam_flag("noquota",         Opt_noquota),
 127         fsparam_flag("usrquota",        Opt_usrquota),
 128         fsparam_flag("grpquota",        Opt_grpquota),
 129         fsparam_flag("prjquota",        Opt_prjquota),
 130         fsparam_flag("uquota",          Opt_uquota),
 131         fsparam_flag("gquota",          Opt_gquota),
 132         fsparam_flag("pquota",          Opt_pquota),
 133         fsparam_flag("uqnoenforce",     Opt_uqnoenforce),
 134         fsparam_flag("gqnoenforce",     Opt_gqnoenforce),
 135         fsparam_flag("pqnoenforce",     Opt_pqnoenforce),
 136         fsparam_flag("qnoenforce",      Opt_qnoenforce),
 137         fsparam_flag("discard",         Opt_discard),
 138         fsparam_flag("nodiscard",       Opt_nodiscard),
 139         fsparam_flag("dax",             Opt_dax),
 140         fsparam_enum("dax",             Opt_dax_enum, dax_param_enums),
 141         {}
 142 };
 143
 144 struct proc_xfs_info {
 145         uint64_t        flag;
 146         char            *str;
 147 };
 148
 149 static int
 150 xfs_fs_show_options(
 151         struct seq_file         *m,
 152         struct dentry           *root)
 153 {
 154         static struct proc_xfs_info xfs_info_set[] = {
 155                 /* the few simple ones we can get from the mount struct */
 156                 { XFS_MOUNT_IKEEP,              ",ikeep" },
 157                 { XFS_MOUNT_WSYNC,              ",wsync" },
 158                 { XFS_MOUNT_NOALIGN,            ",noalign" },
 159                 { XFS_MOUNT_SWALLOC,            ",swalloc" },
 160                 { XFS_MOUNT_NOUUID,             ",nouuid" },
 161                 { XFS_MOUNT_NORECOVERY,         ",norecovery" },
 162                 { XFS_MOUNT_ATTR2,              ",attr2" },
 163                 { XFS_MOUNT_FILESTREAMS,        ",filestreams" },
 164                 { XFS_MOUNT_GRPID,              ",grpid" },
 165                 { XFS_MOUNT_DISCARD,            ",discard" },
 166                 { XFS_MOUNT_LARGEIO,            ",largeio" },
 167                 { XFS_MOUNT_DAX_ALWAYS,         ",dax=always" },
 168                 { XFS_MOUNT_DAX_NEVER,          ",dax=never" },
 169                 { 0, NULL }
 170         };
 171         struct xfs_mount        *mp = XFS_M(root->d_sb);
 172         struct proc_xfs_info    *xfs_infop;
 173
 174         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
 175                 if (mp->m_flags & xfs_infop->flag)
 176                         seq_puts(m, xfs_infop->str);
 177         }
 178
 179         seq_printf(m, ",inode%d",
 180                 (mp->m_flags & XFS_MOUNT_SMALL_INUMS) ? 32 : 64);
 181
 182         if (mp->m_flags & XFS_MOUNT_ALLOCSIZE)
 183                 seq_printf(m, ",allocsize=%dk",
 184                            (1 << mp->m_allocsize_log) >> 10);
 185
 186         if (mp->m_logbufs > 0)
 187                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
 188         if (mp->m_logbsize > 0)
 189                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
 190
 191         if (mp->m_logname)
 192                 seq_show_option(m, "logdev", mp->m_logname);
 193         if (mp->m_rtname)
 194                 seq_show_option(m, "rtdev", mp->m_rtname);
 195
 196         if (mp->m_dalign > 0)
 197                 seq_printf(m, ",sunit=%d",
 198                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
 199         if (mp->m_swidth > 0)
 200                 seq_printf(m, ",swidth=%d",
 201                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
 202
 203         if (mp->m_qflags & XFS_UQUOTA_ACCT) {
 204                 if (mp->m_qflags & XFS_UQUOTA_ENFD)
 205                         seq_puts(m, ",usrquota");
 206                 else
 207                         seq_puts(m, ",uqnoenforce");
 208         }
 209
 210         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
 211                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
 212                         seq_puts(m, ",prjquota");
 213                 else
 214                         seq_puts(m, ",pqnoenforce");
 215         }
 216         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
 217                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
 218                         seq_puts(m, ",grpquota");
 219                 else
 220                         seq_puts(m, ",gqnoenforce");
 221         }
 222
 223         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
 224                 seq_puts(m, ",noquota");
 225
 226         return 0;
 227 }
 228
 229 /*
 230  * Set parameters for inode allocation heuristics, taking into account
 231  * filesystem size and inode32/inode64 mount options; i.e. specifically
 232  * whether or not XFS_MOUNT_SMALL_INUMS is set.
 233  *
 234  * Inode allocation patterns are altered only if inode32 is requested
 235  * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
 236  * If altered, XFS_MOUNT_32BITINODES is set as well.
 237  *
 238  * An agcount independent of that in the mount structure is provided
 239  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
 240  * to the potentially higher ag count.
 241  *
 242  * Returns the maximum AG index which may contain inodes.
 243  */
 244 xfs_agnumber_t
 245 xfs_set_inode_alloc(
 246         struct xfs_mount *mp,
 247         xfs_agnumber_t  agcount)
 248 {
 249         xfs_agnumber_t  index;
 250         xfs_agnumber_t  maxagi = 0;
 251         xfs_sb_t        *sbp = &mp->m_sb;
 252         xfs_agnumber_t  max_metadata;
 253         xfs_agino_t     agino;
 254         xfs_ino_t       ino;
 255
 256         /*
 257          * Calculate how much should be reserved for inodes to meet
 258          * the max inode percentage.  Used only for inode32.
 259          */
 260         if (M_IGEO(mp)->maxicount) {
 261                 uint64_t        icount;
 262
 263                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
 264                 do_div(icount, 100);
 265                 icount += sbp->sb_agblocks - 1;
 266                 do_div(icount, sbp->sb_agblocks);
 267                 max_metadata = icount;
 268         } else {
 269                 max_metadata = agcount;
 270         }
 271
 272         /* Get the last possible inode in the filesystem */
 273         agino = XFS_AGB_TO_AGINO(mp, sbp->sb_agblocks - 1);
 274         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
 275
 276         /*
 277          * If user asked for no more than 32-bit inodes, and the fs is
 278          * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
 279          * the allocator to accommodate the request.
 280          */
 281         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
 282                 mp->m_flags |= XFS_MOUNT_32BITINODES;
 283         else
 284                 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
 285
 286         for (index = 0; index < agcount; index++) {
 287                 struct xfs_perag        *pag;
 288
 289                 ino = XFS_AGINO_TO_INO(mp, index, agino);
 290
 291                 pag = xfs_perag_get(mp, index);
 292
 293                 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
 294                         if (ino > XFS_MAXINUMBER_32) {
 295                                 pag->pagi_inodeok = 0;
 296                                 pag->pagf_metadata = 0;
 297                         } else {
 298                                 pag->pagi_inodeok = 1;
 299                                 maxagi++;
 300                                 if (index < max_metadata)
 301                                         pag->pagf_metadata = 1;
 302                                 else
 303                                         pag->pagf_metadata = 0;
 304                         }
 305                 } else {
 306                         pag->pagi_inodeok = 1;
 307                         pag->pagf_metadata = 0;
 308                 }
 309
 310                 xfs_perag_put(pag);
 311         }
 312
 313         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
 314 }
 315
 316 STATIC int
 317 xfs_blkdev_get(
 318         xfs_mount_t             *mp,
 319         const char              *name,
 320         struct block_device     **bdevp)
 321 {
 322         int                     error = 0;
 323
 324         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
 325                                     mp);
 326         if (IS_ERR(*bdevp)) {
 327                 error = PTR_ERR(*bdevp);
 328                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
 329         }
 330
 331         return error;
 332 }
 333
 334 STATIC void
 335 xfs_blkdev_put(
 336         struct block_device     *bdev)
 337 {
 338         if (bdev)
 339                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 340 }
 341
 342 void
 343 xfs_blkdev_issue_flush(
 344         xfs_buftarg_t           *buftarg)
 345 {
 346         blkdev_issue_flush(buftarg->bt_bdev);
 347 }
 348
 349 STATIC void
 350 xfs_close_devices(
 351         struct xfs_mount        *mp)
 352 {
 353         struct dax_device *dax_ddev = mp->m_ddev_targp->bt_daxdev;
 354
 355         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 356                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
 357                 struct dax_device *dax_logdev = mp->m_logdev_targp->bt_daxdev;
 358
 359                 xfs_free_buftarg(mp->m_logdev_targp);
 360                 xfs_blkdev_put(logdev);
 361                 fs_put_dax(dax_logdev);
 362         }
 363         if (mp->m_rtdev_targp) {
 364                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
 365                 struct dax_device *dax_rtdev = mp->m_rtdev_targp->bt_daxdev;
 366
 367                 xfs_free_buftarg(mp->m_rtdev_targp);
 368                 xfs_blkdev_put(rtdev);
 369                 fs_put_dax(dax_rtdev);
 370         }
 371         xfs_free_buftarg(mp->m_ddev_targp);
 372         fs_put_dax(dax_ddev);
 373 }
 374
 375 /*
 376  * The file system configurations are:
 377  *      (1) device (partition) with data and internal log
 378  *      (2) logical volume with data and log subvolumes.
 379  *      (3) logical volume with data, log, and realtime subvolumes.
 380  *
 381  * We only have to handle opening the log and realtime volumes here if
 382  * they are present.  The data subvolume has already been opened by
 383  * get_sb_bdev() and is stored in sb->s_bdev.
 384  */
 385 STATIC int
 386 xfs_open_devices(
 387         struct xfs_mount        *mp)
 388 {
 389         struct block_device     *ddev = mp->m_super->s_bdev;
 390         struct dax_device       *dax_ddev = fs_dax_get_by_bdev(ddev);
 391         struct dax_device       *dax_logdev = NULL, *dax_rtdev = NULL;
 392         struct block_device     *logdev = NULL, *rtdev = NULL;
 393         int                     error;
 394
 395         /*
 396          * Open real time and log devices - order is important.
 397          */
 398         if (mp->m_logname) {
 399                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
 400                 if (error)
 401                         goto out;
 402                 dax_logdev = fs_dax_get_by_bdev(logdev);
 403         }
 404
 405         if (mp->m_rtname) {
 406                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
 407                 if (error)
 408                         goto out_close_logdev;
 409
 410                 if (rtdev == ddev || rtdev == logdev) {
 411                         xfs_warn(mp,
 412         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
 413                         error = -EINVAL;
 414                         goto out_close_rtdev;
 415                 }
 416                 dax_rtdev = fs_dax_get_by_bdev(rtdev);
 417         }
 418
 419         /*
 420          * Setup xfs_mount buffer target pointers
 421          */
 422         error = -ENOMEM;
 423         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, dax_ddev);
 424         if (!mp->m_ddev_targp)
 425                 goto out_close_rtdev;
 426
 427         if (rtdev) {
 428                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, dax_rtdev);
 429                 if (!mp->m_rtdev_targp)
 430                         goto out_free_ddev_targ;
 431         }
 432
 433         if (logdev && logdev != ddev) {
 434                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, dax_logdev);
 435                 if (!mp->m_logdev_targp)
 436                         goto out_free_rtdev_targ;
 437         } else {
 438                 mp->m_logdev_targp = mp->m_ddev_targp;
 439         }
 440
 441         return 0;
 442
 443  out_free_rtdev_targ:
 444         if (mp->m_rtdev_targp)
 445                 xfs_free_buftarg(mp->m_rtdev_targp);
 446  out_free_ddev_targ:
 447         xfs_free_buftarg(mp->m_ddev_targp);
 448  out_close_rtdev:
 449         xfs_blkdev_put(rtdev);
 450         fs_put_dax(dax_rtdev);
 451  out_close_logdev:
 452         if (logdev && logdev != ddev) {
 453                 xfs_blkdev_put(logdev);
 454                 fs_put_dax(dax_logdev);
 455         }
 456  out:
 457         fs_put_dax(dax_ddev);
 458         return error;
 459 }
 460
 461 /*
 462  * Setup xfs_mount buffer target pointers based on superblock
 463  */
 464 STATIC int
 465 xfs_setup_devices(
 466         struct xfs_mount        *mp)
 467 {
 468         int                     error;
 469
 470         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
 471         if (error)
 472                 return error;
 473
 474         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 475                 unsigned int    log_sector_size = BBSIZE;
 476
 477                 if (xfs_sb_version_hassector(&mp->m_sb))
 478                         log_sector_size = mp->m_sb.sb_logsectsize;
 479                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
 480                                             log_sector_size);
 481                 if (error)
 482                         return error;
 483         }
 484         if (mp->m_rtdev_targp) {
 485                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
 486                                             mp->m_sb.sb_sectsize);
 487                 if (error)
 488                         return error;
 489         }
 490
 491         return 0;
 492 }
 493
 494 STATIC int
 495 xfs_init_mount_workqueues(
 496         struct xfs_mount        *mp)
 497 {
 498         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
 499                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
 500                         1, mp->m_super->s_id);
 501         if (!mp->m_buf_workqueue)
 502                 goto out;
 503
 504         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
 505                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
 506                         0, mp->m_super->s_id);
 507         if (!mp->m_unwritten_workqueue)
 508                 goto out_destroy_buf;
 509
 510         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
 511                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_UNBOUND),
 512                         0, mp->m_super->s_id);
 513         if (!mp->m_cil_workqueue)
 514                 goto out_destroy_unwritten;
 515
 516         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
 517                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
 518                         0, mp->m_super->s_id);
 519         if (!mp->m_reclaim_workqueue)
 520                 goto out_destroy_cil;
 521
 522         mp->m_blockgc_workqueue = alloc_workqueue("xfs-blockgc/%s",
 523                         WQ_SYSFS | WQ_UNBOUND | WQ_FREEZABLE | WQ_MEM_RECLAIM,
 524                         0, mp->m_super->s_id);
 525         if (!mp->m_blockgc_workqueue)
 526                 goto out_destroy_reclaim;
 527
 528         mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s",
 529                         XFS_WQFLAGS(WQ_FREEZABLE), 0, mp->m_super->s_id);
 530         if (!mp->m_sync_workqueue)
 531                 goto out_destroy_eofb;
 532
 533         return 0;
 534
 535 out_destroy_eofb:
 536         destroy_workqueue(mp->m_blockgc_workqueue);
 537 out_destroy_reclaim:
 538         destroy_workqueue(mp->m_reclaim_workqueue);
 539 out_destroy_cil:
 540         destroy_workqueue(mp->m_cil_workqueue);
 541 out_destroy_unwritten:
 542         destroy_workqueue(mp->m_unwritten_workqueue);
 543 out_destroy_buf:
 544         destroy_workqueue(mp->m_buf_workqueue);
 545 out:
 546         return -ENOMEM;
 547 }
 548
 549 STATIC void
 550 xfs_destroy_mount_workqueues(
 551         struct xfs_mount        *mp)
 552 {
 553         destroy_workqueue(mp->m_sync_workqueue);
 554         destroy_workqueue(mp->m_blockgc_workqueue);
 555         destroy_workqueue(mp->m_reclaim_workqueue);
 556         destroy_workqueue(mp->m_cil_workqueue);
 557         destroy_workqueue(mp->m_unwritten_workqueue);
 558         destroy_workqueue(mp->m_buf_workqueue);
 559 }
 560
 561 static void
 562 xfs_flush_inodes_worker(
 563         struct work_struct      *work)
 564 {
 565         struct xfs_mount        *mp = container_of(work, struct xfs_mount,
 566                                                    m_flush_inodes_work);
 567         struct super_block      *sb = mp->m_super;
 568
 569         if (down_read_trylock(&sb->s_umount)) {
 570                 sync_inodes_sb(sb);
 571                 up_read(&sb->s_umount);
 572         }
 573 }
 574
 575 /*
 576  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
 577  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
 578  * for IO to complete so that we effectively throttle multiple callers to the
 579  * rate at which IO is completing.
 580  */
 581 void
 582 xfs_flush_inodes(
 583         struct xfs_mount        *mp)
 584 {
 585         /*
 586          * If flush_work() returns true then that means we waited for a flush
 587          * which was already in progress.  Don't bother running another scan.
 588          */
 589         if (flush_work(&mp->m_flush_inodes_work))
 590                 return;
 591
 592         queue_work(mp->m_sync_workqueue, &mp->m_flush_inodes_work);
 593         flush_work(&mp->m_flush_inodes_work);
 594 }
 595
 596 /* Catch misguided souls that try to use this interface on XFS */
 597 STATIC struct inode *
 598 xfs_fs_alloc_inode(
 599         struct super_block      *sb)
 600 {
 601         BUG();
 602         return NULL;
 603 }
 604
 605 #ifdef DEBUG
 606 static void
 607 xfs_check_delalloc(
 608         struct xfs_inode        *ip,
 609         int                     whichfork)
 610 {
 611         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
 612         struct xfs_bmbt_irec    got;
 613         struct xfs_iext_cursor  icur;
 614
 615         if (!ifp || !xfs_iext_lookup_extent(ip, ifp, 0, &icur, &got))
 616                 return;
 617         do {
 618                 if (isnullstartblock(got.br_startblock)) {
 619                         xfs_warn(ip->i_mount,
 620         "ino %llx %s fork has delalloc extent at [0x%llx:0x%llx]",
 621                                 ip->i_ino,
 622                                 whichfork == XFS_DATA_FORK ? "data" : "cow",
 623                                 got.br_startoff, got.br_blockcount);
 624                 }
 625         } while (xfs_iext_next_extent(ifp, &icur, &got));
 626 }
 627 #else
 628 #define xfs_check_delalloc(ip, whichfork)       do { } while (0)
 629 #endif
 630
 631 /*
 632  * Now that the generic code is guaranteed not to be accessing
 633  * the linux inode, we can inactivate and reclaim the inode.
 634  */
 635 STATIC void
 636 xfs_fs_destroy_inode(
 637         struct inode            *inode)
 638 {
 639         struct xfs_inode        *ip = XFS_I(inode);
 640
 641         trace_xfs_destroy_inode(ip);
 642
 643         ASSERT(!rwsem_is_locked(&inode->i_rwsem));
 644         XFS_STATS_INC(ip->i_mount, vn_rele);
 645         XFS_STATS_INC(ip->i_mount, vn_remove);
 646
 647         xfs_inactive(ip);
 648
 649         if (!XFS_FORCED_SHUTDOWN(ip->i_mount) && ip->i_delayed_blks) {
 650                 xfs_check_delalloc(ip, XFS_DATA_FORK);
 651                 xfs_check_delalloc(ip, XFS_COW_FORK);
 652                 ASSERT(0);
 653         }
 654
 655         XFS_STATS_INC(ip->i_mount, vn_reclaim);
 656
 657         /*
 658          * We should never get here with one of the reclaim flags already set.
 659          */
 660         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
 661         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
 662
 663         /*
 664          * We always use background reclaim here because even if the inode is
 665          * clean, it still may be under IO and hence we have wait for IO
 666          * completion to occur before we can reclaim the inode. The background
 667          * reclaim path handles this more efficiently than we can here, so
 668          * simply let background reclaim tear down all inodes.
 669          */
 670         xfs_inode_set_reclaim_tag(ip);
 671 }
 672
 673 static void
 674 xfs_fs_dirty_inode(
 675         struct inode                    *inode,
 676         int                             flag)
 677 {
 678         struct xfs_inode                *ip = XFS_I(inode);
 679         struct xfs_mount                *mp = ip->i_mount;
 680         struct xfs_trans                *tp;
 681
 682         if (!(inode->i_sb->s_flags & SB_LAZYTIME))
 683                 return;
 684         if (flag != I_DIRTY_SYNC || !(inode->i_state & I_DIRTY_TIME))
 685                 return;
 686
 687         if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
 688                 return;
 689         xfs_ilock(ip, XFS_ILOCK_EXCL);
 690         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 691         xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
 692         xfs_trans_commit(tp);
 693 }
 694
 695 /*
 696  * Slab object creation initialisation for the XFS inode.
 697  * This covers only the idempotent fields in the XFS inode;
 698  * all other fields need to be initialised on allocation
 699  * from the slab. This avoids the need to repeatedly initialise
 700  * fields in the xfs inode that left in the initialise state
 701  * when freeing the inode.
 702  */
 703 STATIC void
 704 xfs_fs_inode_init_once(
 705         void                    *inode)
 706 {
 707         struct xfs_inode        *ip = inode;
 708
 709         memset(ip, 0, sizeof(struct xfs_inode));
 710
 711         /* vfs inode */
 712         inode_init_once(VFS_I(ip));
 713
 714         /* xfs inode */
 715         atomic_set(&ip->i_pincount, 0);
 716         spin_lock_init(&ip->i_flags_lock);
 717
 718         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
 719                      "xfsino", ip->i_ino);
 720         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
 721                      "xfsino", ip->i_ino);
 722 }
 723
 724 /*
 725  * We do an unlocked check for XFS_IDONTCACHE here because we are already
 726  * serialised against cache hits here via the inode->i_lock and igrab() in
 727  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
 728  * racing with us, and it avoids needing to grab a spinlock here for every inode
 729  * we drop the final reference on.
 730  */
 731 STATIC int
 732 xfs_fs_drop_inode(
 733         struct inode            *inode)
 734 {
 735         struct xfs_inode        *ip = XFS_I(inode);
 736
 737         /*
 738          * If this unlinked inode is in the middle of recovery, don't
 739          * drop the inode just yet; log recovery will take care of
 740          * that.  See the comment for this inode flag.
 741          */
 742         if (ip->i_flags & XFS_IRECOVERY) {
 743                 ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED);
 744                 return 0;
 745         }
 746
 747         return generic_drop_inode(inode);
 748 }
 749
 750 static void
 751 xfs_mount_free(
 752         struct xfs_mount        *mp)
 753 {
 754         kfree(mp->m_rtname);
 755         kfree(mp->m_logname);
 756         kmem_free(mp);
 757 }
 758
 759 STATIC int
 760 xfs_fs_sync_fs(
 761         struct super_block      *sb,
 762         int                     wait)
 763 {
 764         struct xfs_mount        *mp = XFS_M(sb);
 765
 766         /*
 767          * Doing anything during the async pass would be counterproductive.
 768          */
 769         if (!wait)
 770                 return 0;
 771
 772         xfs_log_force(mp, XFS_LOG_SYNC);
 773         if (laptop_mode) {
 774                 /*
 775                  * The disk must be active because we're syncing.
 776                  * We schedule log work now (now that the disk is
 777                  * active) instead of later (when it might not be).
 778                  */
 779                 flush_delayed_work(&mp->m_log->l_work);
 780         }
 781
 782         return 0;
 783 }
 784
 785 STATIC int
 786 xfs_fs_statfs(
 787         struct dentry           *dentry,
 788         struct kstatfs          *statp)
 789 {
 790         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
 791         xfs_sb_t                *sbp = &mp->m_sb;
 792         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
 793         uint64_t                fakeinos, id;
 794         uint64_t                icount;
 795         uint64_t                ifree;
 796         uint64_t                fdblocks;
 797         xfs_extlen_t            lsize;
 798         int64_t                 ffree;
 799
 800         statp->f_type = XFS_SUPER_MAGIC;
 801         statp->f_namelen = MAXNAMELEN - 1;
 802
 803         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
 804         statp->f_fsid = u64_to_fsid(id);
 805
 806         icount = percpu_counter_sum(&mp->m_icount);
 807         ifree = percpu_counter_sum(&mp->m_ifree);
 808         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
 809
 810         spin_lock(&mp->m_sb_lock);
 811         statp->f_bsize = sbp->sb_blocksize;
 812         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
 813         statp->f_blocks = sbp->sb_dblocks - lsize;
 814         spin_unlock(&mp->m_sb_lock);
 815
 816         /* make sure statp->f_bfree does not underflow */
 817         statp->f_bfree = max_t(int64_t, fdblocks - mp->m_alloc_set_aside, 0);
 818         statp->f_bavail = statp->f_bfree;
 819
 820         fakeinos = XFS_FSB_TO_INO(mp, statp->f_bfree);
 821         statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
 822         if (M_IGEO(mp)->maxicount)
 823                 statp->f_files = min_t(typeof(statp->f_files),
 824                                         statp->f_files,
 825                                         M_IGEO(mp)->maxicount);
 826
 827         /* If sb_icount overshot maxicount, report actual allocation */
 828         statp->f_files = max_t(typeof(statp->f_files),
 829                                         statp->f_files,
 830                                         sbp->sb_icount);
 831
 832         /* make sure statp->f_ffree does not underflow */
 833         ffree = statp->f_files - (icount - ifree);
 834         statp->f_ffree = max_t(int64_t, ffree, 0);
 835
 836
 837         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
 838             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
 839                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
 840                 xfs_qm_statvfs(ip, statp);
 841
 842         if (XFS_IS_REALTIME_MOUNT(mp) &&
 843             (ip->i_d.di_flags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
 844                 statp->f_blocks = sbp->sb_rblocks;
 845                 statp->f_bavail = statp->f_bfree =
 846                         sbp->sb_frextents * sbp->sb_rextsize;
 847         }
 848
 849         return 0;
 850 }
 851
 852 STATIC void
 853 xfs_save_resvblks(struct xfs_mount *mp)
 854 {
 855         uint64_t resblks = 0;
 856
 857         mp->m_resblks_save = mp->m_resblks;
 858         xfs_reserve_blocks(mp, &resblks, NULL);
 859 }
 860
 861 STATIC void
 862 xfs_restore_resvblks(struct xfs_mount *mp)
 863 {
 864         uint64_t resblks;
 865
 866         if (mp->m_resblks_save) {
 867                 resblks = mp->m_resblks_save;
 868                 mp->m_resblks_save = 0;
 869         } else
 870                 resblks = xfs_default_resblks(mp);
 871
 872         xfs_reserve_blocks(mp, &resblks, NULL);
 873 }
 874
 875 /*
 876  * Second stage of a freeze. The data is already frozen so we only
 877  * need to take care of the metadata. Once that's done sync the superblock
 878  * to the log to dirty it in case of a crash while frozen. This ensures that we
 879  * will recover the unlinked inode lists on the next mount.
 880  */
 881 STATIC int
 882 xfs_fs_freeze(
 883         struct super_block      *sb)
 884 {
 885         struct xfs_mount        *mp = XFS_M(sb);
 886         unsigned int            flags;
 887         int                     ret;
 888
 889         /*
 890          * The filesystem is now frozen far enough that memory reclaim
 891          * cannot safely operate on the filesystem. Hence we need to
 892          * set a GFP_NOFS context here to avoid recursion deadlocks.
 893          */
 894         flags = memalloc_nofs_save();
 895         xfs_blockgc_stop(mp);
 896         xfs_save_resvblks(mp);
 897         ret = xfs_log_quiesce(mp);
 898         memalloc_nofs_restore(flags);
 899         return ret;
 900 }
 901
 902 STATIC int
 903 xfs_fs_unfreeze(
 904         struct super_block      *sb)
 905 {
 906         struct xfs_mount        *mp = XFS_M(sb);
 907
 908         xfs_restore_resvblks(mp);
 909         xfs_log_work_queue(mp);
 910         xfs_blockgc_start(mp);
 911         return 0;
 912 }
 913
 914 /*
 915  * This function fills in xfs_mount_t fields based on mount args.
 916  * Note: the superblock _has_ now been read in.
 917  */
 918 STATIC int
 919 xfs_finish_flags(
 920         struct xfs_mount        *mp)
 921 {
 922         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
 923
 924         /* Fail a mount where the logbuf is smaller than the log stripe */
 925         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
 926                 if (mp->m_logbsize <= 0 &&
 927                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
 928                         mp->m_logbsize = mp->m_sb.sb_logsunit;
 929                 } else if (mp->m_logbsize > 0 &&
 930                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
 931                         xfs_warn(mp,
 932                 "logbuf size must be greater than or equal to log stripe size");
 933                         return -EINVAL;
 934                 }
 935         } else {
 936                 /* Fail a mount if the logbuf is larger than 32K */
 937                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
 938                         xfs_warn(mp,
 939                 "logbuf size for version 1 logs must be 16K or 32K");
 940                         return -EINVAL;
 941                 }
 942         }
 943
 944         /*
 945          * V5 filesystems always use attr2 format for attributes.
 946          */
 947         if (xfs_sb_version_hascrc(&mp->m_sb) &&
 948             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
 949                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
 950                              "attr2 is always enabled for V5 filesystems.");
 951                 return -EINVAL;
 952         }
 953
 954         /*
 955          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
 956          * told by noattr2 to turn it off
 957          */
 958         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
 959             !(mp->m_flags & XFS_MOUNT_NOATTR2))
 960                 mp->m_flags |= XFS_MOUNT_ATTR2;
 961
 962         /*
 963          * prohibit r/w mounts of read-only filesystems
 964          */
 965         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
 966                 xfs_warn(mp,
 967                         "cannot mount a read-only filesystem as read-write");
 968                 return -EROFS;
 969         }
 970
 971         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
 972             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
 973             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
 974                 xfs_warn(mp,
 975                   "Super block does not support project and group quota together");
 976                 return -EINVAL;
 977         }
 978
 979         return 0;
 980 }
 981
 982 static int
 983 xfs_init_percpu_counters(
 984         struct xfs_mount        *mp)
 985 {
 986         int             error;
 987
 988         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
 989         if (error)
 990                 return -ENOMEM;
 991
 992         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
 993         if (error)
 994                 goto free_icount;
 995
 996         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
 997         if (error)
 998                 goto free_ifree;
 999
1000         error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL);
1001         if (error)
1002                 goto free_fdblocks;
1003
1004         return 0;
1005
1006 free_fdblocks:
1007         percpu_counter_destroy(&mp->m_fdblocks);
1008 free_ifree:
1009         percpu_counter_destroy(&mp->m_ifree);
1010 free_icount:
1011         percpu_counter_destroy(&mp->m_icount);
1012         return -ENOMEM;
1013 }
1014
1015 void
1016 xfs_reinit_percpu_counters(
1017         struct xfs_mount        *mp)
1018 {
1019         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1020         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1021         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1022 }
1023
1024 static void
1025 xfs_destroy_percpu_counters(
1026         struct xfs_mount        *mp)
1027 {
1028         percpu_counter_destroy(&mp->m_icount);
1029         percpu_counter_destroy(&mp->m_ifree);
1030         percpu_counter_destroy(&mp->m_fdblocks);
1031         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
1032                percpu_counter_sum(&mp->m_delalloc_blks) == 0);
1033         percpu_counter_destroy(&mp->m_delalloc_blks);
1034 }
1035
1036 static void
1037 xfs_fs_put_super(
1038         struct super_block      *sb)
1039 {
1040         struct xfs_mount        *mp = XFS_M(sb);
1041
1042         /* if ->fill_super failed, we have no mount to tear down */
1043         if (!sb->s_fs_info)
1044                 return;
1045
1046         xfs_notice(mp, "Unmounting Filesystem");
1047         xfs_filestream_unmount(mp);
1048         xfs_unmountfs(mp);
1049
1050         xfs_freesb(mp);
1051         free_percpu(mp->m_stats.xs_stats);
1052         xfs_destroy_percpu_counters(mp);
1053         xfs_destroy_mount_workqueues(mp);
1054         xfs_close_devices(mp);
1055
1056         sb->s_fs_info = NULL;
1057         xfs_mount_free(mp);
1058 }
1059
1060 static long
1061 xfs_fs_nr_cached_objects(
1062         struct super_block      *sb,
1063         struct shrink_control   *sc)
1064 {
1065         /* Paranoia: catch incorrect calls during mount setup or teardown */
1066         if (WARN_ON_ONCE(!sb->s_fs_info))
1067                 return 0;
1068         return xfs_reclaim_inodes_count(XFS_M(sb));
1069 }
1070
1071 static long
1072 xfs_fs_free_cached_objects(
1073         struct super_block      *sb,
1074         struct shrink_control   *sc)
1075 {
1076         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1077 }
1078
1079 static const struct super_operations xfs_super_operations = {
1080         .alloc_inode            = xfs_fs_alloc_inode,
1081         .destroy_inode          = xfs_fs_destroy_inode,
1082         .dirty_inode            = xfs_fs_dirty_inode,
1083         .drop_inode             = xfs_fs_drop_inode,
1084         .put_super              = xfs_fs_put_super,
1085         .sync_fs                = xfs_fs_sync_fs,
1086         .freeze_fs              = xfs_fs_freeze,
1087         .unfreeze_fs            = xfs_fs_unfreeze,
1088         .statfs                 = xfs_fs_statfs,
1089         .show_options           = xfs_fs_show_options,
1090         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1091         .free_cached_objects    = xfs_fs_free_cached_objects,
1092 };
1093
1094 static int
1095 suffix_kstrtoint(
1096         const char      *s,
1097         unsigned int    base,
1098         int             *res)
1099 {
1100         int             last, shift_left_factor = 0, _res;
1101         char            *value;
1102         int             ret = 0;
1103
1104         value = kstrdup(s, GFP_KERNEL);
1105         if (!value)
1106                 return -ENOMEM;
1107
1108         last = strlen(value) - 1;
1109         if (value[last] == 'K' || value[last] == 'k') {
1110                 shift_left_factor = 10;
1111                 value[last] = '\0';
1112         }
1113         if (value[last] == 'M' || value[last] == 'm') {
1114                 shift_left_factor = 20;
1115                 value[last] = '\0';
1116         }
1117         if (value[last] == 'G' || value[last] == 'g') {
1118                 shift_left_factor = 30;
1119                 value[last] = '\0';
1120         }
1121
1122         if (kstrtoint(value, base, &_res))
1123                 ret = -EINVAL;
1124         kfree(value);
1125         *res = _res << shift_left_factor;
1126         return ret;
1127 }
1128
1129 /*
1130  * Set mount state from a mount option.
1131  *
1132  * NOTE: mp->m_super is NULL here!
1133  */
1134 static int
1135 xfs_fs_parse_param(
1136         struct fs_context       *fc,
1137         struct fs_parameter     *param)
1138 {
1139         struct xfs_mount        *mp = fc->s_fs_info;
1140         struct fs_parse_result  result;
1141         int                     size = 0;
1142         int                     opt;
1143
1144         opt = fs_parse(fc, xfs_fs_parameters, param, &result);
1145         if (opt < 0)
1146                 return opt;
1147
1148         switch (opt) {
1149         case Opt_logbufs:
1150                 mp->m_logbufs = result.uint_32;
1151                 return 0;
1152         case Opt_logbsize:
1153                 if (suffix_kstrtoint(param->string, 10, &mp->m_logbsize))
1154                         return -EINVAL;
1155                 return 0;
1156         case Opt_logdev:
1157                 kfree(mp->m_logname);
1158                 mp->m_logname = kstrdup(param->string, GFP_KERNEL);
1159                 if (!mp->m_logname)
1160                         return -ENOMEM;
1161                 return 0;
1162         case Opt_rtdev:
1163                 kfree(mp->m_rtname);
1164                 mp->m_rtname = kstrdup(param->string, GFP_KERNEL);
1165                 if (!mp->m_rtname)
1166                         return -ENOMEM;
1167                 return 0;
1168         case Opt_allocsize:
1169                 if (suffix_kstrtoint(param->string, 10, &size))
1170                         return -EINVAL;
1171                 mp->m_allocsize_log = ffs(size) - 1;
1172                 mp->m_flags |= XFS_MOUNT_ALLOCSIZE;
1173                 return 0;
1174         case Opt_grpid:
1175         case Opt_bsdgroups:
1176                 mp->m_flags |= XFS_MOUNT_GRPID;
1177                 return 0;
1178         case Opt_nogrpid:
1179         case Opt_sysvgroups:
1180                 mp->m_flags &= ~XFS_MOUNT_GRPID;
1181                 return 0;
1182         case Opt_wsync:
1183                 mp->m_flags |= XFS_MOUNT_WSYNC;
1184                 return 0;
1185         case Opt_norecovery:
1186                 mp->m_flags |= XFS_MOUNT_NORECOVERY;
1187                 return 0;
1188         case Opt_noalign:
1189                 mp->m_flags |= XFS_MOUNT_NOALIGN;
1190                 return 0;
1191         case Opt_swalloc:
1192                 mp->m_flags |= XFS_MOUNT_SWALLOC;
1193                 return 0;
1194         case Opt_sunit:
1195                 mp->m_dalign = result.uint_32;
1196                 return 0;
1197         case Opt_swidth:
1198                 mp->m_swidth = result.uint_32;
1199                 return 0;
1200         case Opt_inode32:
1201                 mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1202                 return 0;
1203         case Opt_inode64:
1204                 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1205                 return 0;
1206         case Opt_nouuid:
1207                 mp->m_flags |= XFS_MOUNT_NOUUID;
1208                 return 0;
1209         case Opt_largeio:
1210                 mp->m_flags |= XFS_MOUNT_LARGEIO;
1211                 return 0;
1212         case Opt_nolargeio:
1213                 mp->m_flags &= ~XFS_MOUNT_LARGEIO;
1214                 return 0;
1215         case Opt_filestreams:
1216                 mp->m_flags |= XFS_MOUNT_FILESTREAMS;
1217                 return 0;
1218         case Opt_noquota:
1219                 mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
1220                 mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
1221                 mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
1222                 return 0;
1223         case Opt_quota:
1224         case Opt_uquota:
1225         case Opt_usrquota:
1226                 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
1227                                  XFS_UQUOTA_ENFD);
1228                 return 0;
1229         case Opt_qnoenforce:
1230         case Opt_uqnoenforce:
1231                 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
1232                 mp->m_qflags &= ~XFS_UQUOTA_ENFD;
1233                 return 0;
1234         case Opt_pquota:
1235         case Opt_prjquota:
1236                 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
1237                                  XFS_PQUOTA_ENFD);
1238                 return 0;
1239         case Opt_pqnoenforce:
1240                 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
1241                 mp->m_qflags &= ~XFS_PQUOTA_ENFD;
1242                 return 0;
1243         case Opt_gquota:
1244         case Opt_grpquota:
1245                 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
1246                                  XFS_GQUOTA_ENFD);
1247                 return 0;
1248         case Opt_gqnoenforce:
1249                 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
1250                 mp->m_qflags &= ~XFS_GQUOTA_ENFD;
1251                 return 0;
1252         case Opt_discard:
1253                 mp->m_flags |= XFS_MOUNT_DISCARD;
1254                 return 0;
1255         case Opt_nodiscard:
1256                 mp->m_flags &= ~XFS_MOUNT_DISCARD;
1257                 return 0;
1258 #ifdef CONFIG_FS_DAX
1259         case Opt_dax:
1260                 xfs_mount_set_dax_mode(mp, XFS_DAX_ALWAYS);
1261                 return 0;
1262         case Opt_dax_enum:
1263                 xfs_mount_set_dax_mode(mp, result.uint_32);
1264                 return 0;
1265 #endif
1266         /* Following mount options will be removed in September 2025 */
1267         case Opt_ikeep:
1268                 xfs_warn(mp, "%s mount option is deprecated.", param->key);
1269                 mp->m_flags |= XFS_MOUNT_IKEEP;
1270                 return 0;
1271         case Opt_noikeep:
1272                 xfs_warn(mp, "%s mount option is deprecated.", param->key);
1273                 mp->m_flags &= ~XFS_MOUNT_IKEEP;
1274                 return 0;
1275         case Opt_attr2:
1276                 xfs_warn(mp, "%s mount option is deprecated.", param->key);
1277                 mp->m_flags |= XFS_MOUNT_ATTR2;
1278                 return 0;
1279         case Opt_noattr2:
1280                 xfs_warn(mp, "%s mount option is deprecated.", param->key);
1281                 mp->m_flags &= ~XFS_MOUNT_ATTR2;
1282                 mp->m_flags |= XFS_MOUNT_NOATTR2;
1283                 return 0;
1284         default:
1285                 xfs_warn(mp, "unknown mount option [%s].", param->key);
1286                 return -EINVAL;
1287         }
1288
1289         return 0;
1290 }
1291
1292 static int
1293 xfs_fs_validate_params(
1294         struct xfs_mount        *mp)
1295 {
1296         /*
1297          * no recovery flag requires a read-only mount
1298          */
1299         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
1300             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
1301                 xfs_warn(mp, "no-recovery mounts must be read-only.");
1302                 return -EINVAL;
1303         }
1304
1305         if ((mp->m_flags & XFS_MOUNT_NOALIGN) &&
1306             (mp->m_dalign || mp->m_swidth)) {
1307                 xfs_warn(mp,
1308         "sunit and swidth options incompatible with the noalign option");
1309                 return -EINVAL;
1310         }
1311
1312         if (!IS_ENABLED(CONFIG_XFS_QUOTA) && mp->m_qflags != 0) {
1313                 xfs_warn(mp, "quota support not available in this kernel.");
1314                 return -EINVAL;
1315         }
1316
1317         if ((mp->m_dalign && !mp->m_swidth) ||
1318             (!mp->m_dalign && mp->m_swidth)) {
1319                 xfs_warn(mp, "sunit and swidth must be specified together");
1320                 return -EINVAL;
1321         }
1322
1323         if (mp->m_dalign && (mp->m_swidth % mp->m_dalign != 0)) {
1324                 xfs_warn(mp,
1325         "stripe width (%d) must be a multiple of the stripe unit (%d)",
1326                         mp->m_swidth, mp->m_dalign);
1327                 return -EINVAL;
1328         }
1329
1330         if (mp->m_logbufs != -1 &&
1331             mp->m_logbufs != 0 &&
1332             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
1333              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
1334                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
1335                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
1336                 return -EINVAL;
1337         }
1338
1339         if (mp->m_logbsize != -1 &&
1340             mp->m_logbsize !=  0 &&
1341             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
1342              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
1343              !is_power_of_2(mp->m_logbsize))) {
1344                 xfs_warn(mp,
1345                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
1346                         mp->m_logbsize);
1347                 return -EINVAL;
1348         }
1349
1350         if ((mp->m_flags & XFS_MOUNT_ALLOCSIZE) &&
1351             (mp->m_allocsize_log > XFS_MAX_IO_LOG ||
1352              mp->m_allocsize_log < XFS_MIN_IO_LOG)) {
1353                 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
1354                         mp->m_allocsize_log, XFS_MIN_IO_LOG, XFS_MAX_IO_LOG);
1355                 return -EINVAL;
1356         }
1357
1358         return 0;
1359 }
1360
1361 static int
1362 xfs_fs_fill_super(
1363         struct super_block      *sb,
1364         struct fs_context       *fc)
1365 {
1366         struct xfs_mount        *mp = sb->s_fs_info;
1367         struct inode            *root;
1368         int                     flags = 0, error;
1369
1370         mp->m_super = sb;
1371
1372         error = xfs_fs_validate_params(mp);
1373         if (error)
1374                 goto out_free_names;
1375
1376         sb_min_blocksize(sb, BBSIZE);
1377         sb->s_xattr = xfs_xattr_handlers;
1378         sb->s_export_op = &xfs_export_operations;
1379 #ifdef CONFIG_XFS_QUOTA
1380         sb->s_qcop = &xfs_quotactl_operations;
1381         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1382 #endif
1383         sb->s_op = &xfs_super_operations;
1384
1385         /*
1386          * Delay mount work if the debug hook is set. This is debug
1387          * instrumention to coordinate simulation of xfs mount failures with
1388          * VFS superblock operations
1389          */
1390         if (xfs_globals.mount_delay) {
1391                 xfs_notice(mp, "Delaying mount for %d seconds.",
1392                         xfs_globals.mount_delay);
1393                 msleep(xfs_globals.mount_delay * 1000);
1394         }
1395
1396         if (fc->sb_flags & SB_SILENT)
1397                 flags |= XFS_MFSI_QUIET;
1398
1399         error = xfs_open_devices(mp);
1400         if (error)
1401                 goto out_free_names;
1402
1403         error = xfs_init_mount_workqueues(mp);
1404         if (error)
1405                 goto out_close_devices;
1406
1407         error = xfs_init_percpu_counters(mp);
1408         if (error)
1409                 goto out_destroy_workqueues;
1410
1411         /* Allocate stats memory before we do operations that might use it */
1412         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1413         if (!mp->m_stats.xs_stats) {
1414                 error = -ENOMEM;
1415                 goto out_destroy_counters;
1416         }
1417
1418         error = xfs_readsb(mp, flags);
1419         if (error)
1420                 goto out_free_stats;
1421
1422         error = xfs_finish_flags(mp);
1423         if (error)
1424                 goto out_free_sb;
1425
1426         error = xfs_setup_devices(mp);
1427         if (error)
1428                 goto out_free_sb;
1429
1430         /* V4 support is undergoing deprecation. */
1431         if (!xfs_sb_version_hascrc(&mp->m_sb)) {
1432 #ifdef CONFIG_XFS_SUPPORT_V4
1433                 xfs_warn_once(mp,
1434         "Deprecated V4 format (crc=0) will not be supported after September 2030.");
1435 #else
1436                 xfs_warn(mp,
1437         "Deprecated V4 format (crc=0) not supported by kernel.");
1438                 error = -EINVAL;
1439                 goto out_free_sb;
1440 #endif
1441         }
1442
1443         /* Filesystem claims it needs repair, so refuse the mount. */
1444         if (xfs_sb_version_needsrepair(&mp->m_sb)) {
1445                 xfs_warn(mp, "Filesystem needs repair.  Please run xfs_repair.");
1446                 error = -EFSCORRUPTED;
1447                 goto out_free_sb;
1448         }
1449
1450         /*
1451          * Don't touch the filesystem if a user tool thinks it owns the primary
1452          * superblock.  mkfs doesn't clear the flag from secondary supers, so
1453          * we don't check them at all.
1454          */
1455         if (mp->m_sb.sb_inprogress) {
1456                 xfs_warn(mp, "Offline file system operation in progress!");
1457                 error = -EFSCORRUPTED;
1458                 goto out_free_sb;
1459         }
1460
1461         /*
1462          * Until this is fixed only page-sized or smaller data blocks work.
1463          */
1464         if (mp->m_sb.sb_blocksize > PAGE_SIZE) {
1465                 xfs_warn(mp,
1466                 "File system with blocksize %d bytes. "
1467                 "Only pagesize (%ld) or less will currently work.",
1468                                 mp->m_sb.sb_blocksize, PAGE_SIZE);
1469                 error = -ENOSYS;
1470                 goto out_free_sb;
1471         }
1472
1473         /* Ensure this filesystem fits in the page cache limits */
1474         if (xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_dblocks) ||
1475             xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_rblocks)) {
1476                 xfs_warn(mp,
1477                 "file system too large to be mounted on this system.");
1478                 error = -EFBIG;
1479                 goto out_free_sb;
1480         }
1481
1482         /*
1483          * XFS block mappings use 54 bits to store the logical block offset.
1484          * This should suffice to handle the maximum file size that the VFS
1485          * supports (currently 2^63 bytes on 64-bit and ULONG_MAX << PAGE_SHIFT
1486          * bytes on 32-bit), but as XFS and VFS have gotten the s_maxbytes
1487          * calculation wrong on 32-bit kernels in the past, we'll add a WARN_ON
1488          * to check this assertion.
1489          *
1490          * Avoid integer overflow by comparing the maximum bmbt offset to the
1491          * maximum pagecache offset in units of fs blocks.
1492          */
1493         if (!xfs_verify_fileoff(mp, XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE))) {
1494                 xfs_warn(mp,
1495 "MAX_LFS_FILESIZE block offset (%llu) exceeds extent map maximum (%llu)!",
1496                          XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE),
1497                          XFS_MAX_FILEOFF);
1498                 error = -EINVAL;
1499                 goto out_free_sb;
1500         }
1501
1502         error = xfs_filestream_mount(mp);
1503         if (error)
1504                 goto out_free_sb;
1505
1506         /*
1507          * we must configure the block size in the superblock before we run the
1508          * full mount process as the mount process can lookup and cache inodes.
1509          */
1510         sb->s_magic = XFS_SUPER_MAGIC;
1511         sb->s_blocksize = mp->m_sb.sb_blocksize;
1512         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1513         sb->s_maxbytes = MAX_LFS_FILESIZE;
1514         sb->s_max_links = XFS_MAXLINK;
1515         sb->s_time_gran = 1;
1516         if (xfs_sb_version_hasbigtime(&mp->m_sb)) {
1517                 sb->s_time_min = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MIN);
1518                 sb->s_time_max = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MAX);
1519         } else {
1520                 sb->s_time_min = XFS_LEGACY_TIME_MIN;
1521                 sb->s_time_max = XFS_LEGACY_TIME_MAX;
1522         }
1523         trace_xfs_inode_timestamp_range(mp, sb->s_time_min, sb->s_time_max);
1524         sb->s_iflags |= SB_I_CGROUPWB;
1525
1526         set_posix_acl_flag(sb);
1527
1528         /* version 5 superblocks support inode version counters. */
1529         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1530                 sb->s_flags |= SB_I_VERSION;
1531
1532         if (xfs_sb_version_hasbigtime(&mp->m_sb))
1533                 xfs_warn(mp,
1534  "EXPERIMENTAL big timestamp feature in use. Use at your own risk!");
1535
1536         if (mp->m_flags & XFS_MOUNT_DAX_ALWAYS) {
1537                 bool rtdev_is_dax = false, datadev_is_dax;
1538
1539                 xfs_warn(mp,
1540                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1541
1542                 datadev_is_dax = bdev_dax_supported(mp->m_ddev_targp->bt_bdev,
1543                         sb->s_blocksize);
1544                 if (mp->m_rtdev_targp)
1545                         rtdev_is_dax = bdev_dax_supported(
1546                                 mp->m_rtdev_targp->bt_bdev, sb->s_blocksize);
1547                 if (!rtdev_is_dax && !datadev_is_dax) {
1548                         xfs_alert(mp,
1549                         "DAX unsupported by block device. Turning off DAX.");
1550                         xfs_mount_set_dax_mode(mp, XFS_DAX_NEVER);
1551                 }
1552                 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1553                         xfs_alert(mp,
1554                 "DAX and reflink cannot be used together!");
1555                         error = -EINVAL;
1556                         goto out_filestream_unmount;
1557                 }
1558         }
1559
1560         if (mp->m_flags & XFS_MOUNT_DISCARD) {
1561                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1562
1563                 if (!blk_queue_discard(q)) {
1564                         xfs_warn(mp, "mounting with \"discard\" option, but "
1565                                         "the device does not support discard");
1566                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
1567                 }
1568         }
1569
1570         if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1571                 if (mp->m_sb.sb_rblocks) {
1572                         xfs_alert(mp,
1573         "reflink not compatible with realtime device!");
1574                         error = -EINVAL;
1575                         goto out_filestream_unmount;
1576                 }
1577
1578                 if (xfs_globals.always_cow) {
1579                         xfs_info(mp, "using DEBUG-only always_cow mode.");
1580                         mp->m_always_cow = true;
1581                 }
1582         }
1583
1584         if (xfs_sb_version_hasrmapbt(&mp->m_sb) && mp->m_sb.sb_rblocks) {
1585                 xfs_alert(mp,
1586         "reverse mapping btree not compatible with realtime device!");
1587                 error = -EINVAL;
1588                 goto out_filestream_unmount;
1589         }
1590
1591         if (xfs_sb_version_hasinobtcounts(&mp->m_sb))
1592                 xfs_warn(mp,
1593  "EXPERIMENTAL inode btree counters feature in use. Use at your own risk!");
1594
1595         error = xfs_mountfs(mp);
1596         if (error)
1597                 goto out_filestream_unmount;
1598
1599         root = igrab(VFS_I(mp->m_rootip));
1600         if (!root) {
1601                 error = -ENOENT;
1602                 goto out_unmount;
1603         }
1604         sb->s_root = d_make_root(root);
1605         if (!sb->s_root) {
1606                 error = -ENOMEM;
1607                 goto out_unmount;
1608         }
1609
1610         return 0;
1611
1612  out_filestream_unmount:
1613         xfs_filestream_unmount(mp);
1614  out_free_sb:
1615         xfs_freesb(mp);
1616  out_free_stats:
1617         free_percpu(mp->m_stats.xs_stats);
1618  out_destroy_counters:
1619         xfs_destroy_percpu_counters(mp);
1620  out_destroy_workqueues:
1621         xfs_destroy_mount_workqueues(mp);
1622  out_close_devices:
1623         xfs_close_devices(mp);
1624  out_free_names:
1625         sb->s_fs_info = NULL;
1626         xfs_mount_free(mp);
1627         return error;
1628
1629  out_unmount:
1630         xfs_filestream_unmount(mp);
1631         xfs_unmountfs(mp);
1632         goto out_free_sb;
1633 }
1634
1635 static int
1636 xfs_fs_get_tree(
1637         struct fs_context       *fc)
1638 {
1639         return get_tree_bdev(fc, xfs_fs_fill_super);
1640 }
1641
1642 static int
1643 xfs_remount_rw(
1644         struct xfs_mount        *mp)
1645 {
1646         struct xfs_sb           *sbp = &mp->m_sb;
1647         int error;
1648
1649         if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1650                 xfs_warn(mp,
1651                         "ro->rw transition prohibited on norecovery mount");
1652                 return -EINVAL;
1653         }
1654
1655         if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1656             xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1657                 xfs_warn(mp,
1658         "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1659                         (sbp->sb_features_ro_compat &
1660                                 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1661                 return -EINVAL;
1662         }
1663
1664         mp->m_flags &= ~XFS_MOUNT_RDONLY;
1665
1666         /*
1667          * If this is the first remount to writeable state we might have some
1668          * superblock changes to update.
1669          */
1670         if (mp->m_update_sb) {
1671                 error = xfs_sync_sb(mp, false);
1672                 if (error) {
1673                         xfs_warn(mp, "failed to write sb changes");
1674                         return error;
1675                 }
1676                 mp->m_update_sb = false;
1677         }
1678
1679         /*
1680          * Fill out the reserve pool if it is empty. Use the stashed value if
1681          * it is non-zero, otherwise go with the default.
1682          */
1683         xfs_restore_resvblks(mp);
1684         xfs_log_work_queue(mp);
1685
1686         /* Recover any CoW blocks that never got remapped. */
1687         error = xfs_reflink_recover_cow(mp);
1688         if (error) {
1689                 xfs_err(mp,
1690                         "Error %d recovering leftover CoW allocations.", error);
1691                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1692                 return error;
1693         }
1694         xfs_blockgc_start(mp);
1695
1696         /* Create the per-AG metadata reservation pool .*/
1697         error = xfs_fs_reserve_ag_blocks(mp);
1698         if (error && error != -ENOSPC)
1699                 return error;
1700
1701         return 0;
1702 }
1703
1704 static int
1705 xfs_remount_ro(
1706         struct xfs_mount        *mp)
1707 {
1708         int error;
1709
1710         /*
1711          * Cancel background eofb scanning so it cannot race with the final
1712          * log force+buftarg wait and deadlock the remount.
1713          */
1714         xfs_blockgc_stop(mp);
1715
1716         /* Get rid of any leftover CoW reservations... */
1717         error = xfs_blockgc_free_space(mp, NULL);
1718         if (error) {
1719                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1720                 return error;
1721         }
1722
1723         /* Free the per-AG metadata reservation pool. */
1724         error = xfs_fs_unreserve_ag_blocks(mp);
1725         if (error) {
1726                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1727                 return error;
1728         }
1729
1730         /*
1731          * Before we sync the metadata, we need to free up the reserve block
1732          * pool so that the used block count in the superblock on disk is
1733          * correct at the end of the remount. Stash the current* reserve pool
1734          * size so that if we get remounted rw, we can return it to the same
1735          * size.
1736          */
1737         xfs_save_resvblks(mp);
1738
1739         xfs_log_clean(mp);
1740         mp->m_flags |= XFS_MOUNT_RDONLY;
1741
1742         return 0;
1743 }
1744
1745 /*
1746  * Logically we would return an error here to prevent users from believing
1747  * they might have changed mount options using remount which can't be changed.
1748  *
1749  * But unfortunately mount(8) adds all options from mtab and fstab to the mount
1750  * arguments in some cases so we can't blindly reject options, but have to
1751  * check for each specified option if it actually differs from the currently
1752  * set option and only reject it if that's the case.
1753  *
1754  * Until that is implemented we return success for every remount request, and
1755  * silently ignore all options that we can't actually change.
1756  */
1757 static int
1758 xfs_fs_reconfigure(
1759         struct fs_context *fc)
1760 {
1761         struct xfs_mount        *mp = XFS_M(fc->root->d_sb);
1762         struct xfs_mount        *new_mp = fc->s_fs_info;
1763         xfs_sb_t                *sbp = &mp->m_sb;
1764         int                     flags = fc->sb_flags;
1765         int                     error;
1766
1767         /* version 5 superblocks always support version counters. */
1768         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1769                 fc->sb_flags |= SB_I_VERSION;
1770
1771         error = xfs_fs_validate_params(new_mp);
1772         if (error)
1773                 return error;
1774
1775         sync_filesystem(mp->m_super);
1776
1777         /* inode32 -> inode64 */
1778         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) &&
1779             !(new_mp->m_flags & XFS_MOUNT_SMALL_INUMS)) {
1780                 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1781                 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1782         }
1783
1784         /* inode64 -> inode32 */
1785         if (!(mp->m_flags & XFS_MOUNT_SMALL_INUMS) &&
1786             (new_mp->m_flags & XFS_MOUNT_SMALL_INUMS)) {
1787                 mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1788                 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1789         }
1790
1791         /* ro -> rw */
1792         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(flags & SB_RDONLY)) {
1793                 error = xfs_remount_rw(mp);
1794                 if (error)
1795                         return error;
1796         }
1797
1798         /* rw -> ro */
1799         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (flags & SB_RDONLY)) {
1800                 error = xfs_remount_ro(mp);
1801                 if (error)
1802                         return error;
1803         }
1804
1805         return 0;
1806 }
1807
1808 static void xfs_fs_free(
1809         struct fs_context       *fc)
1810 {
1811         struct xfs_mount        *mp = fc->s_fs_info;
1812
1813         /*
1814          * mp is stored in the fs_context when it is initialized.
1815          * mp is transferred to the superblock on a successful mount,
1816          * but if an error occurs before the transfer we have to free
1817          * it here.
1818          */
1819         if (mp)
1820                 xfs_mount_free(mp);
1821 }
1822
1823 static const struct fs_context_operations xfs_context_ops = {
1824         .parse_param = xfs_fs_parse_param,
1825         .get_tree    = xfs_fs_get_tree,
1826         .reconfigure = xfs_fs_reconfigure,
1827         .free        = xfs_fs_free,
1828 };
1829
1830 static int xfs_init_fs_context(
1831         struct fs_context       *fc)
1832 {
1833         struct xfs_mount        *mp;
1834
1835         mp = kmem_alloc(sizeof(struct xfs_mount), KM_ZERO);
1836         if (!mp)
1837                 return -ENOMEM;
1838
1839         spin_lock_init(&mp->m_sb_lock);
1840         spin_lock_init(&mp->m_agirotor_lock);
1841         INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
1842         spin_lock_init(&mp->m_perag_lock);
1843         mutex_init(&mp->m_growlock);
1844         INIT_WORK(&mp->m_flush_inodes_work, xfs_flush_inodes_worker);
1845         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1846         mp->m_kobj.kobject.kset = xfs_kset;
1847         /*
1848          * We don't create the finobt per-ag space reservation until after log
1849          * recovery, so we must set this to true so that an ifree transaction
1850          * started during log recovery will not depend on space reservations
1851          * for finobt expansion.
1852          */
1853         mp->m_finobt_nores = true;
1854
1855         /*
1856          * These can be overridden by the mount option parsing.
1857          */
1858         mp->m_logbufs = -1;
1859         mp->m_logbsize = -1;
1860         mp->m_allocsize_log = 16; /* 64k */
1861
1862         /*
1863          * Copy binary VFS mount flags we are interested in.
1864          */
1865         if (fc->sb_flags & SB_RDONLY)
1866                 mp->m_flags |= XFS_MOUNT_RDONLY;
1867         if (fc->sb_flags & SB_DIRSYNC)
1868                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
1869         if (fc->sb_flags & SB_SYNCHRONOUS)
1870                 mp->m_flags |= XFS_MOUNT_WSYNC;
1871
1872         fc->s_fs_info = mp;
1873         fc->ops = &xfs_context_ops;
1874
1875         return 0;
1876 }
1877
1878 static struct file_system_type xfs_fs_type = {
1879         .owner                  = THIS_MODULE,
1880         .name                   = "xfs",
1881         .init_fs_context        = xfs_init_fs_context,
1882         .parameters             = xfs_fs_parameters,
1883         .kill_sb                = kill_block_super,
1884         .fs_flags               = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
1885 };
1886 MODULE_ALIAS_FS("xfs");
1887
1888 STATIC int __init
1889 xfs_init_zones(void)
1890 {
1891         xfs_log_ticket_zone = kmem_cache_create("xfs_log_ticket",
1892                                                 sizeof(struct xlog_ticket),
1893                                                 0, 0, NULL);
1894         if (!xfs_log_ticket_zone)
1895                 goto out;
1896
1897         xfs_bmap_free_item_zone = kmem_cache_create("xfs_bmap_free_item",
1898                                         sizeof(struct xfs_extent_free_item),
1899                                         0, 0, NULL);
1900         if (!xfs_bmap_free_item_zone)
1901                 goto out_destroy_log_ticket_zone;
1902
1903         xfs_btree_cur_zone = kmem_cache_create("xfs_btree_cur",
1904                                                sizeof(struct xfs_btree_cur),
1905                                                0, 0, NULL);
1906         if (!xfs_btree_cur_zone)
1907                 goto out_destroy_bmap_free_item_zone;
1908
1909         xfs_da_state_zone = kmem_cache_create("xfs_da_state",
1910                                               sizeof(struct xfs_da_state),
1911                                               0, 0, NULL);
1912         if (!xfs_da_state_zone)
1913                 goto out_destroy_btree_cur_zone;
1914
1915         xfs_ifork_zone = kmem_cache_create("xfs_ifork",
1916                                            sizeof(struct xfs_ifork),
1917                                            0, 0, NULL);
1918         if (!xfs_ifork_zone)
1919                 goto out_destroy_da_state_zone;
1920
1921         xfs_trans_zone = kmem_cache_create("xf_trans",
1922                                            sizeof(struct xfs_trans),
1923                                            0, 0, NULL);
1924         if (!xfs_trans_zone)
1925                 goto out_destroy_ifork_zone;
1926
1927
1928         /*
1929          * The size of the zone allocated buf log item is the maximum
1930          * size possible under XFS.  This wastes a little bit of memory,
1931          * but it is much faster.
1932          */
1933         xfs_buf_item_zone = kmem_cache_create("xfs_buf_item",
1934                                               sizeof(struct xfs_buf_log_item),
1935                                               0, 0, NULL);
1936         if (!xfs_buf_item_zone)
1937                 goto out_destroy_trans_zone;
1938
1939         xfs_efd_zone = kmem_cache_create("xfs_efd_item",
1940                                         (sizeof(struct xfs_efd_log_item) +
1941                                         (XFS_EFD_MAX_FAST_EXTENTS - 1) *
1942                                         sizeof(struct xfs_extent)),
1943                                         0, 0, NULL);
1944         if (!xfs_efd_zone)
1945                 goto out_destroy_buf_item_zone;
1946
1947         xfs_efi_zone = kmem_cache_create("xfs_efi_item",
1948                                          (sizeof(struct xfs_efi_log_item) +
1949                                          (XFS_EFI_MAX_FAST_EXTENTS - 1) *
1950                                          sizeof(struct xfs_extent)),
1951                                          0, 0, NULL);
1952         if (!xfs_efi_zone)
1953                 goto out_destroy_efd_zone;
1954
1955         xfs_inode_zone = kmem_cache_create("xfs_inode",
1956                                            sizeof(struct xfs_inode), 0,
1957                                            (SLAB_HWCACHE_ALIGN |
1958                                             SLAB_RECLAIM_ACCOUNT |
1959                                             SLAB_MEM_SPREAD | SLAB_ACCOUNT),
1960                                            xfs_fs_inode_init_once);
1961         if (!xfs_inode_zone)
1962                 goto out_destroy_efi_zone;
1963
1964         xfs_ili_zone = kmem_cache_create("xfs_ili",
1965                                          sizeof(struct xfs_inode_log_item), 0,
1966                                          SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
1967                                          NULL);
1968         if (!xfs_ili_zone)
1969                 goto out_destroy_inode_zone;
1970
1971         xfs_icreate_zone = kmem_cache_create("xfs_icr",
1972                                              sizeof(struct xfs_icreate_item),
1973                                              0, 0, NULL);
1974         if (!xfs_icreate_zone)
1975                 goto out_destroy_ili_zone;
1976
1977         xfs_rud_zone = kmem_cache_create("xfs_rud_item",
1978                                          sizeof(struct xfs_rud_log_item),
1979                                          0, 0, NULL);
1980         if (!xfs_rud_zone)
1981                 goto out_destroy_icreate_zone;
1982
1983         xfs_rui_zone = kmem_cache_create("xfs_rui_item",
1984                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
1985                         0, 0, NULL);
1986         if (!xfs_rui_zone)
1987                 goto out_destroy_rud_zone;
1988
1989         xfs_cud_zone = kmem_cache_create("xfs_cud_item",
1990                                          sizeof(struct xfs_cud_log_item),
1991                                          0, 0, NULL);
1992         if (!xfs_cud_zone)
1993                 goto out_destroy_rui_zone;
1994
1995         xfs_cui_zone = kmem_cache_create("xfs_cui_item",
1996                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
1997                         0, 0, NULL);
1998         if (!xfs_cui_zone)
1999                 goto out_destroy_cud_zone;
2000
2001         xfs_bud_zone = kmem_cache_create("xfs_bud_item",
2002                                          sizeof(struct xfs_bud_log_item),
2003                                          0, 0, NULL);
2004         if (!xfs_bud_zone)
2005                 goto out_destroy_cui_zone;
2006
2007         xfs_bui_zone = kmem_cache_create("xfs_bui_item",
2008                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
2009                         0, 0, NULL);
2010         if (!xfs_bui_zone)
2011                 goto out_destroy_bud_zone;
2012
2013         return 0;
2014
2015  out_destroy_bud_zone:
2016         kmem_cache_destroy(xfs_bud_zone);
2017  out_destroy_cui_zone:
2018         kmem_cache_destroy(xfs_cui_zone);
2019  out_destroy_cud_zone:
2020         kmem_cache_destroy(xfs_cud_zone);
2021  out_destroy_rui_zone:
2022         kmem_cache_destroy(xfs_rui_zone);
2023  out_destroy_rud_zone:
2024         kmem_cache_destroy(xfs_rud_zone);
2025  out_destroy_icreate_zone:
2026         kmem_cache_destroy(xfs_icreate_zone);
2027  out_destroy_ili_zone:
2028         kmem_cache_destroy(xfs_ili_zone);
2029  out_destroy_inode_zone:
2030         kmem_cache_destroy(xfs_inode_zone);
2031  out_destroy_efi_zone:
2032         kmem_cache_destroy(xfs_efi_zone);
2033  out_destroy_efd_zone:
2034         kmem_cache_destroy(xfs_efd_zone);
2035  out_destroy_buf_item_zone:
2036         kmem_cache_destroy(xfs_buf_item_zone);
2037  out_destroy_trans_zone:
2038         kmem_cache_destroy(xfs_trans_zone);
2039  out_destroy_ifork_zone:
2040         kmem_cache_destroy(xfs_ifork_zone);
2041  out_destroy_da_state_zone:
2042         kmem_cache_destroy(xfs_da_state_zone);
2043  out_destroy_btree_cur_zone:
2044         kmem_cache_destroy(xfs_btree_cur_zone);
2045  out_destroy_bmap_free_item_zone:
2046         kmem_cache_destroy(xfs_bmap_free_item_zone);
2047  out_destroy_log_ticket_zone:
2048         kmem_cache_destroy(xfs_log_ticket_zone);
2049  out:
2050         return -ENOMEM;
2051 }
2052
2053 STATIC void
2054 xfs_destroy_zones(void)
2055 {
2056         /*
2057          * Make sure all delayed rcu free are flushed before we
2058          * destroy caches.
2059          */
2060         rcu_barrier();
2061         kmem_cache_destroy(xfs_bui_zone);
2062         kmem_cache_destroy(xfs_bud_zone);
2063         kmem_cache_destroy(xfs_cui_zone);
2064         kmem_cache_destroy(xfs_cud_zone);
2065         kmem_cache_destroy(xfs_rui_zone);
2066         kmem_cache_destroy(xfs_rud_zone);
2067         kmem_cache_destroy(xfs_icreate_zone);
2068         kmem_cache_destroy(xfs_ili_zone);
2069         kmem_cache_destroy(xfs_inode_zone);
2070         kmem_cache_destroy(xfs_efi_zone);
2071         kmem_cache_destroy(xfs_efd_zone);
2072         kmem_cache_destroy(xfs_buf_item_zone);
2073         kmem_cache_destroy(xfs_trans_zone);
2074         kmem_cache_destroy(xfs_ifork_zone);
2075         kmem_cache_destroy(xfs_da_state_zone);
2076         kmem_cache_destroy(xfs_btree_cur_zone);
2077         kmem_cache_destroy(xfs_bmap_free_item_zone);
2078         kmem_cache_destroy(xfs_log_ticket_zone);
2079 }
2080
2081 STATIC int __init
2082 xfs_init_workqueues(void)
2083 {
2084         /*
2085          * The allocation workqueue can be used in memory reclaim situations
2086          * (writepage path), and parallelism is only limited by the number of
2087          * AGs in all the filesystems mounted. Hence use the default large
2088          * max_active value for this workqueue.
2089          */
2090         xfs_alloc_wq = alloc_workqueue("xfsalloc",
2091                         XFS_WQFLAGS(WQ_MEM_RECLAIM | WQ_FREEZABLE), 0);
2092         if (!xfs_alloc_wq)
2093                 return -ENOMEM;
2094
2095         xfs_discard_wq = alloc_workqueue("xfsdiscard", XFS_WQFLAGS(WQ_UNBOUND),
2096                         0);
2097         if (!xfs_discard_wq)
2098                 goto out_free_alloc_wq;
2099
2100         return 0;
2101 out_free_alloc_wq:
2102         destroy_workqueue(xfs_alloc_wq);
2103         return -ENOMEM;
2104 }
2105
2106 STATIC void
2107 xfs_destroy_workqueues(void)
2108 {
2109         destroy_workqueue(xfs_discard_wq);
2110         destroy_workqueue(xfs_alloc_wq);
2111 }
2112
2113 STATIC int __init
2114 init_xfs_fs(void)
2115 {
2116         int                     error;
2117
2118         xfs_check_ondisk_structs();
2119
2120         printk(KERN_INFO XFS_VERSION_STRING " with "
2121                          XFS_BUILD_OPTIONS " enabled\n");
2122
2123         xfs_dir_startup();
2124
2125         error = xfs_init_zones();
2126         if (error)
2127                 goto out;
2128
2129         error = xfs_init_workqueues();
2130         if (error)
2131                 goto out_destroy_zones;
2132
2133         error = xfs_mru_cache_init();
2134         if (error)
2135                 goto out_destroy_wq;
2136
2137         error = xfs_buf_init();
2138         if (error)
2139                 goto out_mru_cache_uninit;
2140
2141         error = xfs_init_procfs();
2142         if (error)
2143                 goto out_buf_terminate;
2144
2145         error = xfs_sysctl_register();
2146         if (error)
2147                 goto out_cleanup_procfs;
2148
2149         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2150         if (!xfs_kset) {
2151                 error = -ENOMEM;
2152                 goto out_sysctl_unregister;
2153         }
2154
2155         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2156
2157         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2158         if (!xfsstats.xs_stats) {
2159                 error = -ENOMEM;
2160                 goto out_kset_unregister;
2161         }
2162
2163         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2164                                "stats");
2165         if (error)
2166                 goto out_free_stats;
2167
2168 #ifdef DEBUG
2169         xfs_dbg_kobj.kobject.kset = xfs_kset;
2170         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2171         if (error)
2172                 goto out_remove_stats_kobj;
2173 #endif
2174
2175         error = xfs_qm_init();
2176         if (error)
2177                 goto out_remove_dbg_kobj;
2178
2179         error = register_filesystem(&xfs_fs_type);
2180         if (error)
2181                 goto out_qm_exit;
2182         return 0;
2183
2184  out_qm_exit:
2185         xfs_qm_exit();
2186  out_remove_dbg_kobj:
2187 #ifdef DEBUG
2188         xfs_sysfs_del(&xfs_dbg_kobj);
2189  out_remove_stats_kobj:
2190 #endif
2191         xfs_sysfs_del(&xfsstats.xs_kobj);
2192  out_free_stats:
2193         free_percpu(xfsstats.xs_stats);
2194  out_kset_unregister:
2195         kset_unregister(xfs_kset);
2196  out_sysctl_unregister:
2197         xfs_sysctl_unregister();
2198  out_cleanup_procfs:
2199         xfs_cleanup_procfs();
2200  out_buf_terminate:
2201         xfs_buf_terminate();
2202  out_mru_cache_uninit:
2203         xfs_mru_cache_uninit();
2204  out_destroy_wq:
2205         xfs_destroy_workqueues();
2206  out_destroy_zones:
2207         xfs_destroy_zones();
2208  out:
2209         return error;
2210 }
2211
2212 STATIC void __exit
2213 exit_xfs_fs(void)
2214 {
2215         xfs_qm_exit();
2216         unregister_filesystem(&xfs_fs_type);
2217 #ifdef DEBUG
2218         xfs_sysfs_del(&xfs_dbg_kobj);
2219 #endif
2220         xfs_sysfs_del(&xfsstats.xs_kobj);
2221         free_percpu(xfsstats.xs_stats);
2222         kset_unregister(xfs_kset);
2223         xfs_sysctl_unregister();
2224         xfs_cleanup_procfs();
2225         xfs_buf_terminate();
2226         xfs_mru_cache_uninit();
2227         xfs_destroy_workqueues();
2228         xfs_destroy_zones();
2229         xfs_uuid_table_free();
2230 }
2231
2232 module_init(init_xfs_fs);
2233 module_exit(exit_xfs_fs);
2234
2235 MODULE_AUTHOR("Silicon Graphics, Inc.");
2236 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2237 MODULE_LICENSE("GPL");