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
  39 #include <linux/magic.h>
  40 #include <linux/fs_context.h>
  41 #include <linux/fs_parser.h>
  42
  43 static const struct super_operations xfs_super_operations;
  44
  45 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
  46 #ifdef DEBUG
  47 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
  48 #endif
  49
  50 enum xfs_dax_mode {
  51         XFS_DAX_INODE = 0,
  52         XFS_DAX_ALWAYS = 1,
  53         XFS_DAX_NEVER = 2,
  54 };
  55
  56 static void
  57 xfs_mount_set_dax_mode(
  58         struct xfs_mount        *mp,
  59         enum xfs_dax_mode       mode)
  60 {
  61         switch (mode) {
  62         case XFS_DAX_INODE:
  63                 mp->m_flags &= ~(XFS_MOUNT_DAX_ALWAYS | XFS_MOUNT_DAX_NEVER);
  64                 break;
  65         case XFS_DAX_ALWAYS:
  66                 mp->m_flags |= XFS_MOUNT_DAX_ALWAYS;
  67                 mp->m_flags &= ~XFS_MOUNT_DAX_NEVER;
  68                 break;
  69         case XFS_DAX_NEVER:
  70                 mp->m_flags |= XFS_MOUNT_DAX_NEVER;
  71                 mp->m_flags &= ~XFS_MOUNT_DAX_ALWAYS;
  72                 break;
  73         }
  74 }
  75
  76 static const struct constant_table dax_param_enums[] = {
  77         {"inode",       XFS_DAX_INODE },
  78         {"always",      XFS_DAX_ALWAYS },
  79         {"never",       XFS_DAX_NEVER },
  80         {}
  81 };
  82
  83 /*
  84  * Table driven mount option parser.
  85  */
  86 enum {
  87         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev,
  88         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
  89         Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
  90         Opt_allocsize, Opt_norecovery, Opt_inode64, Opt_inode32, Opt_ikeep,
  91         Opt_noikeep, Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2,
  92         Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
  93         Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
  94         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
  95         Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum,
  96 };
  97
  98 static const struct fs_parameter_spec xfs_fs_parameters[] = {
  99         fsparam_u32("logbufs",          Opt_logbufs),
 100         fsparam_string("logbsize",      Opt_logbsize),
 101         fsparam_string("logdev",        Opt_logdev),
 102         fsparam_string("rtdev",         Opt_rtdev),
 103         fsparam_flag("wsync",           Opt_wsync),
 104         fsparam_flag("noalign",         Opt_noalign),
 105         fsparam_flag("swalloc",         Opt_swalloc),
 106         fsparam_u32("sunit",            Opt_sunit),
 107         fsparam_u32("swidth",           Opt_swidth),
 108         fsparam_flag("nouuid",          Opt_nouuid),
 109         fsparam_flag("grpid",           Opt_grpid),
 110         fsparam_flag("nogrpid",         Opt_nogrpid),
 111         fsparam_flag("bsdgroups",       Opt_bsdgroups),
 112         fsparam_flag("sysvgroups",      Opt_sysvgroups),
 113         fsparam_string("allocsize",     Opt_allocsize),
 114         fsparam_flag("norecovery",      Opt_norecovery),
 115         fsparam_flag("inode64",         Opt_inode64),
 116         fsparam_flag("inode32",         Opt_inode32),
 117         fsparam_flag("ikeep",           Opt_ikeep),
 118         fsparam_flag("noikeep",         Opt_noikeep),
 119         fsparam_flag("largeio",         Opt_largeio),
 120         fsparam_flag("nolargeio",       Opt_nolargeio),
 121         fsparam_flag("attr2",           Opt_attr2),
 122         fsparam_flag("noattr2",         Opt_noattr2),
 123         fsparam_flag("filestreams",     Opt_filestreams),
 124         fsparam_flag("quota",           Opt_quota),
 125         fsparam_flag("noquota",         Opt_noquota),
 126         fsparam_flag("usrquota",        Opt_usrquota),
 127         fsparam_flag("grpquota",        Opt_grpquota),
 128         fsparam_flag("prjquota",        Opt_prjquota),
 129         fsparam_flag("uquota",          Opt_uquota),
 130         fsparam_flag("gquota",          Opt_gquota),
 131         fsparam_flag("pquota",          Opt_pquota),
 132         fsparam_flag("uqnoenforce",     Opt_uqnoenforce),
 133         fsparam_flag("gqnoenforce",     Opt_gqnoenforce),
 134         fsparam_flag("pqnoenforce",     Opt_pqnoenforce),
 135         fsparam_flag("qnoenforce",      Opt_qnoenforce),
 136         fsparam_flag("discard",         Opt_discard),
 137         fsparam_flag("nodiscard",       Opt_nodiscard),
 138         fsparam_flag("dax",             Opt_dax),
 139         fsparam_enum("dax",             Opt_dax_enum, dax_param_enums),
 140         {}
 141 };
 142
 143 struct proc_xfs_info {
 144         uint64_t        flag;
 145         char            *str;
 146 };
 147
 148 static int
 149 xfs_fs_show_options(
 150         struct seq_file         *m,
 151         struct dentry           *root)
 152 {
 153         static struct proc_xfs_info xfs_info_set[] = {
 154                 /* the few simple ones we can get from the mount struct */
 155                 { XFS_MOUNT_IKEEP,              ",ikeep" },
 156                 { XFS_MOUNT_WSYNC,              ",wsync" },
 157                 { XFS_MOUNT_NOALIGN,            ",noalign" },
 158                 { XFS_MOUNT_SWALLOC,            ",swalloc" },
 159                 { XFS_MOUNT_NOUUID,             ",nouuid" },
 160                 { XFS_MOUNT_NORECOVERY,         ",norecovery" },
 161                 { XFS_MOUNT_ATTR2,              ",attr2" },
 162                 { XFS_MOUNT_FILESTREAMS,        ",filestreams" },
 163                 { XFS_MOUNT_GRPID,              ",grpid" },
 164                 { XFS_MOUNT_DISCARD,            ",discard" },
 165                 { XFS_MOUNT_LARGEIO,            ",largeio" },
 166                 { XFS_MOUNT_DAX_ALWAYS,         ",dax=always" },
 167                 { XFS_MOUNT_DAX_NEVER,          ",dax=never" },
 168                 { 0, NULL }
 169         };
 170         struct xfs_mount        *mp = XFS_M(root->d_sb);
 171         struct proc_xfs_info    *xfs_infop;
 172
 173         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
 174                 if (mp->m_flags & xfs_infop->flag)
 175                         seq_puts(m, xfs_infop->str);
 176         }
 177
 178         seq_printf(m, ",inode%d",
 179                 (mp->m_flags & XFS_MOUNT_SMALL_INUMS) ? 32 : 64);
 180
 181         if (mp->m_flags & XFS_MOUNT_ALLOCSIZE)
 182                 seq_printf(m, ",allocsize=%dk",
 183                            (1 << mp->m_allocsize_log) >> 10);
 184
 185         if (mp->m_logbufs > 0)
 186                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
 187         if (mp->m_logbsize > 0)
 188                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
 189
 190         if (mp->m_logname)
 191                 seq_show_option(m, "logdev", mp->m_logname);
 192         if (mp->m_rtname)
 193                 seq_show_option(m, "rtdev", mp->m_rtname);
 194
 195         if (mp->m_dalign > 0)
 196                 seq_printf(m, ",sunit=%d",
 197                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
 198         if (mp->m_swidth > 0)
 199                 seq_printf(m, ",swidth=%d",
 200                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
 201
 202         if (mp->m_qflags & XFS_UQUOTA_ACCT) {
 203                 if (mp->m_qflags & XFS_UQUOTA_ENFD)
 204                         seq_puts(m, ",usrquota");
 205                 else
 206                         seq_puts(m, ",uqnoenforce");
 207         }
 208
 209         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
 210                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
 211                         seq_puts(m, ",prjquota");
 212                 else
 213                         seq_puts(m, ",pqnoenforce");
 214         }
 215         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
 216                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
 217                         seq_puts(m, ",grpquota");
 218                 else
 219                         seq_puts(m, ",gqnoenforce");
 220         }
 221
 222         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
 223                 seq_puts(m, ",noquota");
 224
 225         return 0;
 226 }
 227
 228 /*
 229  * Set parameters for inode allocation heuristics, taking into account
 230  * filesystem size and inode32/inode64 mount options; i.e. specifically
 231  * whether or not XFS_MOUNT_SMALL_INUMS is set.
 232  *
 233  * Inode allocation patterns are altered only if inode32 is requested
 234  * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
 235  * If altered, XFS_MOUNT_32BITINODES is set as well.
 236  *
 237  * An agcount independent of that in the mount structure is provided
 238  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
 239  * to the potentially higher ag count.
 240  *
 241  * Returns the maximum AG index which may contain inodes.
 242  */
 243 xfs_agnumber_t
 244 xfs_set_inode_alloc(
 245         struct xfs_mount *mp,
 246         xfs_agnumber_t  agcount)
 247 {
 248         xfs_agnumber_t  index;
 249         xfs_agnumber_t  maxagi = 0;
 250         xfs_sb_t        *sbp = &mp->m_sb;
 251         xfs_agnumber_t  max_metadata;
 252         xfs_agino_t     agino;
 253         xfs_ino_t       ino;
 254
 255         /*
 256          * Calculate how much should be reserved for inodes to meet
 257          * the max inode percentage.  Used only for inode32.
 258          */
 259         if (M_IGEO(mp)->maxicount) {
 260                 uint64_t        icount;
 261
 262                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
 263                 do_div(icount, 100);
 264                 icount += sbp->sb_agblocks - 1;
 265                 do_div(icount, sbp->sb_agblocks);
 266                 max_metadata = icount;
 267         } else {
 268                 max_metadata = agcount;
 269         }
 270
 271         /* Get the last possible inode in the filesystem */
 272         agino = XFS_AGB_TO_AGINO(mp, sbp->sb_agblocks - 1);
 273         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
 274
 275         /*
 276          * If user asked for no more than 32-bit inodes, and the fs is
 277          * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
 278          * the allocator to accommodate the request.
 279          */
 280         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
 281                 mp->m_flags |= XFS_MOUNT_32BITINODES;
 282         else
 283                 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
 284
 285         for (index = 0; index < agcount; index++) {
 286                 struct xfs_perag        *pag;
 287
 288                 ino = XFS_AGINO_TO_INO(mp, index, agino);
 289
 290                 pag = xfs_perag_get(mp, index);
 291
 292                 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
 293                         if (ino > XFS_MAXINUMBER_32) {
 294                                 pag->pagi_inodeok = 0;
 295                                 pag->pagf_metadata = 0;
 296                         } else {
 297                                 pag->pagi_inodeok = 1;
 298                                 maxagi++;
 299                                 if (index < max_metadata)
 300                                         pag->pagf_metadata = 1;
 301                                 else
 302                                         pag->pagf_metadata = 0;
 303                         }
 304                 } else {
 305                         pag->pagi_inodeok = 1;
 306                         pag->pagf_metadata = 0;
 307                 }
 308
 309                 xfs_perag_put(pag);
 310         }
 311
 312         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
 313 }
 314
 315 STATIC int
 316 xfs_blkdev_get(
 317         xfs_mount_t             *mp,
 318         const char              *name,
 319         struct block_device     **bdevp)
 320 {
 321         int                     error = 0;
 322
 323         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
 324                                     mp);
 325         if (IS_ERR(*bdevp)) {
 326                 error = PTR_ERR(*bdevp);
 327                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
 328         }
 329
 330         return error;
 331 }
 332
 333 STATIC void
 334 xfs_blkdev_put(
 335         struct block_device     *bdev)
 336 {
 337         if (bdev)
 338                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 339 }
 340
 341 void
 342 xfs_blkdev_issue_flush(
 343         xfs_buftarg_t           *buftarg)
 344 {
 345         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS);
 346 }
 347
 348 STATIC void
 349 xfs_close_devices(
 350         struct xfs_mount        *mp)
 351 {
 352         struct dax_device *dax_ddev = mp->m_ddev_targp->bt_daxdev;
 353
 354         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 355                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
 356                 struct dax_device *dax_logdev = mp->m_logdev_targp->bt_daxdev;
 357
 358                 xfs_free_buftarg(mp->m_logdev_targp);
 359                 xfs_blkdev_put(logdev);
 360                 fs_put_dax(dax_logdev);
 361         }
 362         if (mp->m_rtdev_targp) {
 363                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
 364                 struct dax_device *dax_rtdev = mp->m_rtdev_targp->bt_daxdev;
 365
 366                 xfs_free_buftarg(mp->m_rtdev_targp);
 367                 xfs_blkdev_put(rtdev);
 368                 fs_put_dax(dax_rtdev);
 369         }
 370         xfs_free_buftarg(mp->m_ddev_targp);
 371         fs_put_dax(dax_ddev);
 372 }
 373
 374 /*
 375  * The file system configurations are:
 376  *      (1) device (partition) with data and internal log
 377  *      (2) logical volume with data and log subvolumes.
 378  *      (3) logical volume with data, log, and realtime subvolumes.
 379  *
 380  * We only have to handle opening the log and realtime volumes here if
 381  * they are present.  The data subvolume has already been opened by
 382  * get_sb_bdev() and is stored in sb->s_bdev.
 383  */
 384 STATIC int
 385 xfs_open_devices(
 386         struct xfs_mount        *mp)
 387 {
 388         struct block_device     *ddev = mp->m_super->s_bdev;
 389         struct dax_device       *dax_ddev = fs_dax_get_by_bdev(ddev);
 390         struct dax_device       *dax_logdev = NULL, *dax_rtdev = NULL;
 391         struct block_device     *logdev = NULL, *rtdev = NULL;
 392         int                     error;
 393
 394         /*
 395          * Open real time and log devices - order is important.
 396          */
 397         if (mp->m_logname) {
 398                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
 399                 if (error)
 400                         goto out;
 401                 dax_logdev = fs_dax_get_by_bdev(logdev);
 402         }
 403
 404         if (mp->m_rtname) {
 405                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
 406                 if (error)
 407                         goto out_close_logdev;
 408
 409                 if (rtdev == ddev || rtdev == logdev) {
 410                         xfs_warn(mp,
 411         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
 412                         error = -EINVAL;
 413                         goto out_close_rtdev;
 414                 }
 415                 dax_rtdev = fs_dax_get_by_bdev(rtdev);
 416         }
 417
 418         /*
 419          * Setup xfs_mount buffer target pointers
 420          */
 421         error = -ENOMEM;
 422         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, dax_ddev);
 423         if (!mp->m_ddev_targp)
 424                 goto out_close_rtdev;
 425
 426         if (rtdev) {
 427                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, dax_rtdev);
 428                 if (!mp->m_rtdev_targp)
 429                         goto out_free_ddev_targ;
 430         }
 431
 432         if (logdev && logdev != ddev) {
 433                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, dax_logdev);
 434                 if (!mp->m_logdev_targp)
 435                         goto out_free_rtdev_targ;
 436         } else {
 437                 mp->m_logdev_targp = mp->m_ddev_targp;
 438         }
 439
 440         return 0;
 441
 442  out_free_rtdev_targ:
 443         if (mp->m_rtdev_targp)
 444                 xfs_free_buftarg(mp->m_rtdev_targp);
 445  out_free_ddev_targ:
 446         xfs_free_buftarg(mp->m_ddev_targp);
 447  out_close_rtdev:
 448         xfs_blkdev_put(rtdev);
 449         fs_put_dax(dax_rtdev);
 450  out_close_logdev:
 451         if (logdev && logdev != ddev) {
 452                 xfs_blkdev_put(logdev);
 453                 fs_put_dax(dax_logdev);
 454         }
 455  out:
 456         fs_put_dax(dax_ddev);
 457         return error;
 458 }
 459
 460 /*
 461  * Setup xfs_mount buffer target pointers based on superblock
 462  */
 463 STATIC int
 464 xfs_setup_devices(
 465         struct xfs_mount        *mp)
 466 {
 467         int                     error;
 468
 469         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
 470         if (error)
 471                 return error;
 472
 473         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 474                 unsigned int    log_sector_size = BBSIZE;
 475
 476                 if (xfs_sb_version_hassector(&mp->m_sb))
 477                         log_sector_size = mp->m_sb.sb_logsectsize;
 478                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
 479                                             log_sector_size);
 480                 if (error)
 481                         return error;
 482         }
 483         if (mp->m_rtdev_targp) {
 484                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
 485                                             mp->m_sb.sb_sectsize);
 486                 if (error)
 487                         return error;
 488         }
 489
 490         return 0;
 491 }
 492
 493 STATIC int
 494 xfs_init_mount_workqueues(
 495         struct xfs_mount        *mp)
 496 {
 497         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
 498                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_super->s_id);
 499         if (!mp->m_buf_workqueue)
 500                 goto out;
 501
 502         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
 503                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_super->s_id);
 504         if (!mp->m_unwritten_workqueue)
 505                 goto out_destroy_buf;
 506
 507         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
 508                         WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND,
 509                         0, mp->m_super->s_id);
 510         if (!mp->m_cil_workqueue)
 511                 goto out_destroy_unwritten;
 512
 513         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
 514                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_super->s_id);
 515         if (!mp->m_reclaim_workqueue)
 516                 goto out_destroy_cil;
 517
 518         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
 519                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_super->s_id);
 520         if (!mp->m_eofblocks_workqueue)
 521                 goto out_destroy_reclaim;
 522
 523         mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s", WQ_FREEZABLE, 0,
 524                                                mp->m_super->s_id);
 525         if (!mp->m_sync_workqueue)
 526                 goto out_destroy_eofb;
 527
 528         return 0;
 529
 530 out_destroy_eofb:
 531         destroy_workqueue(mp->m_eofblocks_workqueue);
 532 out_destroy_reclaim:
 533         destroy_workqueue(mp->m_reclaim_workqueue);
 534 out_destroy_cil:
 535         destroy_workqueue(mp->m_cil_workqueue);
 536 out_destroy_unwritten:
 537         destroy_workqueue(mp->m_unwritten_workqueue);
 538 out_destroy_buf:
 539         destroy_workqueue(mp->m_buf_workqueue);
 540 out:
 541         return -ENOMEM;
 542 }
 543
 544 STATIC void
 545 xfs_destroy_mount_workqueues(
 546         struct xfs_mount        *mp)
 547 {
 548         destroy_workqueue(mp->m_sync_workqueue);
 549         destroy_workqueue(mp->m_eofblocks_workqueue);
 550         destroy_workqueue(mp->m_reclaim_workqueue);
 551         destroy_workqueue(mp->m_cil_workqueue);
 552         destroy_workqueue(mp->m_unwritten_workqueue);
 553         destroy_workqueue(mp->m_buf_workqueue);
 554 }
 555
 556 static void
 557 xfs_flush_inodes_worker(
 558         struct work_struct      *work)
 559 {
 560         struct xfs_mount        *mp = container_of(work, struct xfs_mount,
 561                                                    m_flush_inodes_work);
 562         struct super_block      *sb = mp->m_super;
 563
 564         if (down_read_trylock(&sb->s_umount)) {
 565                 sync_inodes_sb(sb);
 566                 up_read(&sb->s_umount);
 567         }
 568 }
 569
 570 /*
 571  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
 572  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
 573  * for IO to complete so that we effectively throttle multiple callers to the
 574  * rate at which IO is completing.
 575  */
 576 void
 577 xfs_flush_inodes(
 578         struct xfs_mount        *mp)
 579 {
 580         /*
 581          * If flush_work() returns true then that means we waited for a flush
 582          * which was already in progress.  Don't bother running another scan.
 583          */
 584         if (flush_work(&mp->m_flush_inodes_work))
 585                 return;
 586
 587         queue_work(mp->m_sync_workqueue, &mp->m_flush_inodes_work);
 588         flush_work(&mp->m_flush_inodes_work);
 589 }
 590
 591 /* Catch misguided souls that try to use this interface on XFS */
 592 STATIC struct inode *
 593 xfs_fs_alloc_inode(
 594         struct super_block      *sb)
 595 {
 596         BUG();
 597         return NULL;
 598 }
 599
 600 #ifdef DEBUG
 601 static void
 602 xfs_check_delalloc(
 603         struct xfs_inode        *ip,
 604         int                     whichfork)
 605 {
 606         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
 607         struct xfs_bmbt_irec    got;
 608         struct xfs_iext_cursor  icur;
 609
 610         if (!ifp || !xfs_iext_lookup_extent(ip, ifp, 0, &icur, &got))
 611                 return;
 612         do {
 613                 if (isnullstartblock(got.br_startblock)) {
 614                         xfs_warn(ip->i_mount,
 615         "ino %llx %s fork has delalloc extent at [0x%llx:0x%llx]",
 616                                 ip->i_ino,
 617                                 whichfork == XFS_DATA_FORK ? "data" : "cow",
 618                                 got.br_startoff, got.br_blockcount);
 619                 }
 620         } while (xfs_iext_next_extent(ifp, &icur, &got));
 621 }
 622 #else
 623 #define xfs_check_delalloc(ip, whichfork)       do { } while (0)
 624 #endif
 625
 626 /*
 627  * Now that the generic code is guaranteed not to be accessing
 628  * the linux inode, we can inactivate and reclaim the inode.
 629  */
 630 STATIC void
 631 xfs_fs_destroy_inode(
 632         struct inode            *inode)
 633 {
 634         struct xfs_inode        *ip = XFS_I(inode);
 635
 636         trace_xfs_destroy_inode(ip);
 637
 638         ASSERT(!rwsem_is_locked(&inode->i_rwsem));
 639         XFS_STATS_INC(ip->i_mount, vn_rele);
 640         XFS_STATS_INC(ip->i_mount, vn_remove);
 641
 642         xfs_inactive(ip);
 643
 644         if (!XFS_FORCED_SHUTDOWN(ip->i_mount) && ip->i_delayed_blks) {
 645                 xfs_check_delalloc(ip, XFS_DATA_FORK);
 646                 xfs_check_delalloc(ip, XFS_COW_FORK);
 647                 ASSERT(0);
 648         }
 649
 650         XFS_STATS_INC(ip->i_mount, vn_reclaim);
 651
 652         /*
 653          * We should never get here with one of the reclaim flags already set.
 654          */
 655         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
 656         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
 657
 658         /*
 659          * We always use background reclaim here because even if the inode is
 660          * clean, it still may be under IO and hence we have wait for IO
 661          * completion to occur before we can reclaim the inode. The background
 662          * reclaim path handles this more efficiently than we can here, so
 663          * simply let background reclaim tear down all inodes.
 664          */
 665         xfs_inode_set_reclaim_tag(ip);
 666 }
 667
 668 static void
 669 xfs_fs_dirty_inode(
 670         struct inode                    *inode,
 671         int                             flag)
 672 {
 673         struct xfs_inode                *ip = XFS_I(inode);
 674         struct xfs_mount                *mp = ip->i_mount;
 675         struct xfs_trans                *tp;
 676
 677         if (!(inode->i_sb->s_flags & SB_LAZYTIME))
 678                 return;
 679         if (flag != I_DIRTY_SYNC || !(inode->i_state & I_DIRTY_TIME))
 680                 return;
 681
 682         if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
 683                 return;
 684         xfs_ilock(ip, XFS_ILOCK_EXCL);
 685         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 686         xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
 687         xfs_trans_commit(tp);
 688 }
 689
 690 /*
 691  * Slab object creation initialisation for the XFS inode.
 692  * This covers only the idempotent fields in the XFS inode;
 693  * all other fields need to be initialised on allocation
 694  * from the slab. This avoids the need to repeatedly initialise
 695  * fields in the xfs inode that left in the initialise state
 696  * when freeing the inode.
 697  */
 698 STATIC void
 699 xfs_fs_inode_init_once(
 700         void                    *inode)
 701 {
 702         struct xfs_inode        *ip = inode;
 703
 704         memset(ip, 0, sizeof(struct xfs_inode));
 705
 706         /* vfs inode */
 707         inode_init_once(VFS_I(ip));
 708
 709         /* xfs inode */
 710         atomic_set(&ip->i_pincount, 0);
 711         spin_lock_init(&ip->i_flags_lock);
 712
 713         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
 714                      "xfsino", ip->i_ino);
 715         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
 716                      "xfsino", ip->i_ino);
 717 }
 718
 719 /*
 720  * We do an unlocked check for XFS_IDONTCACHE here because we are already
 721  * serialised against cache hits here via the inode->i_lock and igrab() in
 722  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
 723  * racing with us, and it avoids needing to grab a spinlock here for every inode
 724  * we drop the final reference on.
 725  */
 726 STATIC int
 727 xfs_fs_drop_inode(
 728         struct inode            *inode)
 729 {
 730         struct xfs_inode        *ip = XFS_I(inode);
 731
 732         /*
 733          * If this unlinked inode is in the middle of recovery, don't
 734          * drop the inode just yet; log recovery will take care of
 735          * that.  See the comment for this inode flag.
 736          */
 737         if (ip->i_flags & XFS_IRECOVERY) {
 738                 ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED);
 739                 return 0;
 740         }
 741
 742         return generic_drop_inode(inode);
 743 }
 744
 745 static void
 746 xfs_mount_free(
 747         struct xfs_mount        *mp)
 748 {
 749         kfree(mp->m_rtname);
 750         kfree(mp->m_logname);
 751         kmem_free(mp);
 752 }
 753
 754 STATIC int
 755 xfs_fs_sync_fs(
 756         struct super_block      *sb,
 757         int                     wait)
 758 {
 759         struct xfs_mount        *mp = XFS_M(sb);
 760         int                     error;
 761
 762         /*
 763          * Doing anything during the async pass would be counterproductive.
 764          */
 765         if (!wait)
 766                 return 0;
 767
 768         error = xfs_log_force(mp, XFS_LOG_SYNC);
 769         if (error)
 770                 return error;
 771
 772         if (laptop_mode) {
 773                 /*
 774                  * The disk must be active because we're syncing.
 775                  * We schedule log work now (now that the disk is
 776                  * active) instead of later (when it might not be).
 777                  */
 778                 flush_delayed_work(&mp->m_log->l_work);
 779         }
 780
 781         return 0;
 782 }
 783
 784 STATIC int
 785 xfs_fs_statfs(
 786         struct dentry           *dentry,
 787         struct kstatfs          *statp)
 788 {
 789         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
 790         xfs_sb_t                *sbp = &mp->m_sb;
 791         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
 792         uint64_t                fakeinos, id;
 793         uint64_t                icount;
 794         uint64_t                ifree;
 795         uint64_t                fdblocks;
 796         xfs_extlen_t            lsize;
 797         int64_t                 ffree;
 798
 799         statp->f_type = XFS_SUPER_MAGIC;
 800         statp->f_namelen = MAXNAMELEN - 1;
 801
 802         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
 803         statp->f_fsid = u64_to_fsid(id);
 804
 805         icount = percpu_counter_sum(&mp->m_icount);
 806         ifree = percpu_counter_sum(&mp->m_ifree);
 807         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
 808
 809         spin_lock(&mp->m_sb_lock);
 810         statp->f_bsize = sbp->sb_blocksize;
 811         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
 812         statp->f_blocks = sbp->sb_dblocks - lsize;
 813         spin_unlock(&mp->m_sb_lock);
 814
 815         /* make sure statp->f_bfree does not underflow */
 816         statp->f_bfree = max_t(int64_t, fdblocks - mp->m_alloc_set_aside, 0);
 817         statp->f_bavail = statp->f_bfree;
 818
 819         fakeinos = XFS_FSB_TO_INO(mp, statp->f_bfree);
 820         statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
 821         if (M_IGEO(mp)->maxicount)
 822                 statp->f_files = min_t(typeof(statp->f_files),
 823                                         statp->f_files,
 824                                         M_IGEO(mp)->maxicount);
 825
 826         /* If sb_icount overshot maxicount, report actual allocation */
 827         statp->f_files = max_t(typeof(statp->f_files),
 828                                         statp->f_files,
 829                                         sbp->sb_icount);
 830
 831         /* make sure statp->f_ffree does not underflow */
 832         ffree = statp->f_files - (icount - ifree);
 833         statp->f_ffree = max_t(int64_t, ffree, 0);
 834
 835
 836         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
 837             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
 838                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
 839                 xfs_qm_statvfs(ip, statp);
 840
 841         if (XFS_IS_REALTIME_MOUNT(mp) &&
 842             (ip->i_d.di_flags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
 843                 statp->f_blocks = sbp->sb_rblocks;
 844                 statp->f_bavail = statp->f_bfree =
 845                         sbp->sb_frextents * sbp->sb_rextsize;
 846         }
 847
 848         return 0;
 849 }
 850
 851 STATIC void
 852 xfs_save_resvblks(struct xfs_mount *mp)
 853 {
 854         uint64_t resblks = 0;
 855
 856         mp->m_resblks_save = mp->m_resblks;
 857         xfs_reserve_blocks(mp, &resblks, NULL);
 858 }
 859
 860 STATIC void
 861 xfs_restore_resvblks(struct xfs_mount *mp)
 862 {
 863         uint64_t resblks;
 864
 865         if (mp->m_resblks_save) {
 866                 resblks = mp->m_resblks_save;
 867                 mp->m_resblks_save = 0;
 868         } else
 869                 resblks = xfs_default_resblks(mp);
 870
 871         xfs_reserve_blocks(mp, &resblks, NULL);
 872 }
 873
 874 /*
 875  * Trigger writeback of all the dirty metadata in the file system.
 876  *
 877  * This ensures that the metadata is written to their location on disk rather
 878  * than just existing in transactions in the log. This means after a quiesce
 879  * there is no log replay required to write the inodes to disk - this is the
 880  * primary difference between a sync and a quiesce.
 881  *
 882  * We cancel log work early here to ensure all transactions the log worker may
 883  * run have finished before we clean up and log the superblock and write an
 884  * unmount record. The unfreeze process is responsible for restarting the log
 885  * worker correctly.
 886  */
 887 void
 888 xfs_quiesce_attr(
 889         struct xfs_mount        *mp)
 890 {
 891         int     error = 0;
 892
 893         cancel_delayed_work_sync(&mp->m_log->l_work);
 894
 895         /* force the log to unpin objects from the now complete transactions */
 896         xfs_log_force(mp, XFS_LOG_SYNC);
 897
 898
 899         /* Push the superblock and write an unmount record */
 900         error = xfs_log_sbcount(mp);
 901         if (error)
 902                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
 903                                 "Frozen image may not be consistent.");
 904         xfs_log_quiesce(mp);
 905 }
 906
 907 /*
 908  * Second stage of a freeze. The data is already frozen so we only
 909  * need to take care of the metadata. Once that's done sync the superblock
 910  * to the log to dirty it in case of a crash while frozen. This ensures that we
 911  * will recover the unlinked inode lists on the next mount.
 912  */
 913 STATIC int
 914 xfs_fs_freeze(
 915         struct super_block      *sb)
 916 {
 917         struct xfs_mount        *mp = XFS_M(sb);
 918         unsigned int            flags;
 919         int                     ret;
 920
 921         /*
 922          * The filesystem is now frozen far enough that memory reclaim
 923          * cannot safely operate on the filesystem. Hence we need to
 924          * set a GFP_NOFS context here to avoid recursion deadlocks.
 925          */
 926         flags = memalloc_nofs_save();
 927         xfs_stop_block_reaping(mp);
 928         xfs_save_resvblks(mp);
 929         xfs_quiesce_attr(mp);
 930         ret = xfs_sync_sb(mp, true);
 931         memalloc_nofs_restore(flags);
 932         return ret;
 933 }
 934
 935 STATIC int
 936 xfs_fs_unfreeze(
 937         struct super_block      *sb)
 938 {
 939         struct xfs_mount        *mp = XFS_M(sb);
 940
 941         xfs_restore_resvblks(mp);
 942         xfs_log_work_queue(mp);
 943         xfs_start_block_reaping(mp);
 944         return 0;
 945 }
 946
 947 /*
 948  * This function fills in xfs_mount_t fields based on mount args.
 949  * Note: the superblock _has_ now been read in.
 950  */
 951 STATIC int
 952 xfs_finish_flags(
 953         struct xfs_mount        *mp)
 954 {
 955         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
 956
 957         /* Fail a mount where the logbuf is smaller than the log stripe */
 958         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
 959                 if (mp->m_logbsize <= 0 &&
 960                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
 961                         mp->m_logbsize = mp->m_sb.sb_logsunit;
 962                 } else if (mp->m_logbsize > 0 &&
 963                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
 964                         xfs_warn(mp,
 965                 "logbuf size must be greater than or equal to log stripe size");
 966                         return -EINVAL;
 967                 }
 968         } else {
 969                 /* Fail a mount if the logbuf is larger than 32K */
 970                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
 971                         xfs_warn(mp,
 972                 "logbuf size for version 1 logs must be 16K or 32K");
 973                         return -EINVAL;
 974                 }
 975         }
 976
 977         /*
 978          * V5 filesystems always use attr2 format for attributes.
 979          */
 980         if (xfs_sb_version_hascrc(&mp->m_sb) &&
 981             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
 982                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
 983                              "attr2 is always enabled for V5 filesystems.");
 984                 return -EINVAL;
 985         }
 986
 987         /*
 988          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
 989          * told by noattr2 to turn it off
 990          */
 991         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
 992             !(mp->m_flags & XFS_MOUNT_NOATTR2))
 993                 mp->m_flags |= XFS_MOUNT_ATTR2;
 994
 995         /*
 996          * prohibit r/w mounts of read-only filesystems
 997          */
 998         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
 999                 xfs_warn(mp,
1000                         "cannot mount a read-only filesystem as read-write");
1001                 return -EROFS;
1002         }
1003
1004         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1005             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1006             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1007                 xfs_warn(mp,
1008                   "Super block does not support project and group quota together");
1009                 return -EINVAL;
1010         }
1011
1012         return 0;
1013 }
1014
1015 static int
1016 xfs_init_percpu_counters(
1017         struct xfs_mount        *mp)
1018 {
1019         int             error;
1020
1021         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1022         if (error)
1023                 return -ENOMEM;
1024
1025         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1026         if (error)
1027                 goto free_icount;
1028
1029         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1030         if (error)
1031                 goto free_ifree;
1032
1033         error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL);
1034         if (error)
1035                 goto free_fdblocks;
1036
1037         return 0;
1038
1039 free_fdblocks:
1040         percpu_counter_destroy(&mp->m_fdblocks);
1041 free_ifree:
1042         percpu_counter_destroy(&mp->m_ifree);
1043 free_icount:
1044         percpu_counter_destroy(&mp->m_icount);
1045         return -ENOMEM;
1046 }
1047
1048 void
1049 xfs_reinit_percpu_counters(
1050         struct xfs_mount        *mp)
1051 {
1052         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1053         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1054         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1055 }
1056
1057 static void
1058 xfs_destroy_percpu_counters(
1059         struct xfs_mount        *mp)
1060 {
1061         percpu_counter_destroy(&mp->m_icount);
1062         percpu_counter_destroy(&mp->m_ifree);
1063         percpu_counter_destroy(&mp->m_fdblocks);
1064         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
1065                percpu_counter_sum(&mp->m_delalloc_blks) == 0);
1066         percpu_counter_destroy(&mp->m_delalloc_blks);
1067 }
1068
1069 static void
1070 xfs_fs_put_super(
1071         struct super_block      *sb)
1072 {
1073         struct xfs_mount        *mp = XFS_M(sb);
1074
1075         /* if ->fill_super failed, we have no mount to tear down */
1076         if (!sb->s_fs_info)
1077                 return;
1078
1079         xfs_notice(mp, "Unmounting Filesystem");
1080         xfs_filestream_unmount(mp);
1081         xfs_unmountfs(mp);
1082
1083         xfs_freesb(mp);
1084         free_percpu(mp->m_stats.xs_stats);
1085         xfs_destroy_percpu_counters(mp);
1086         xfs_destroy_mount_workqueues(mp);
1087         xfs_close_devices(mp);
1088
1089         sb->s_fs_info = NULL;
1090         xfs_mount_free(mp);
1091 }
1092
1093 static long
1094 xfs_fs_nr_cached_objects(
1095         struct super_block      *sb,
1096         struct shrink_control   *sc)
1097 {
1098         /* Paranoia: catch incorrect calls during mount setup or teardown */
1099         if (WARN_ON_ONCE(!sb->s_fs_info))
1100                 return 0;
1101         return xfs_reclaim_inodes_count(XFS_M(sb));
1102 }
1103
1104 static long
1105 xfs_fs_free_cached_objects(
1106         struct super_block      *sb,
1107         struct shrink_control   *sc)
1108 {
1109         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1110 }
1111
1112 static const struct super_operations xfs_super_operations = {
1113         .alloc_inode            = xfs_fs_alloc_inode,
1114         .destroy_inode          = xfs_fs_destroy_inode,
1115         .dirty_inode            = xfs_fs_dirty_inode,
1116         .drop_inode             = xfs_fs_drop_inode,
1117         .put_super              = xfs_fs_put_super,
1118         .sync_fs                = xfs_fs_sync_fs,
1119         .freeze_fs              = xfs_fs_freeze,
1120         .unfreeze_fs            = xfs_fs_unfreeze,
1121         .statfs                 = xfs_fs_statfs,
1122         .show_options           = xfs_fs_show_options,
1123         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1124         .free_cached_objects    = xfs_fs_free_cached_objects,
1125 };
1126
1127 static int
1128 suffix_kstrtoint(
1129         const char      *s,
1130         unsigned int    base,
1131         int             *res)
1132 {
1133         int             last, shift_left_factor = 0, _res;
1134         char            *value;
1135         int             ret = 0;
1136
1137         value = kstrdup(s, GFP_KERNEL);
1138         if (!value)
1139                 return -ENOMEM;
1140
1141         last = strlen(value) - 1;
1142         if (value[last] == 'K' || value[last] == 'k') {
1143                 shift_left_factor = 10;
1144                 value[last] = '\0';
1145         }
1146         if (value[last] == 'M' || value[last] == 'm') {
1147                 shift_left_factor = 20;
1148                 value[last] = '\0';
1149         }
1150         if (value[last] == 'G' || value[last] == 'g') {
1151                 shift_left_factor = 30;
1152                 value[last] = '\0';
1153         }
1154
1155         if (kstrtoint(value, base, &_res))
1156                 ret = -EINVAL;
1157         kfree(value);
1158         *res = _res << shift_left_factor;
1159         return ret;
1160 }
1161
1162 static inline void
1163 xfs_fs_warn_deprecated(
1164         struct fs_context       *fc,
1165         struct fs_parameter     *param,
1166         uint64_t                flag,
1167         bool                    value)
1168 {
1169         /* Don't print the warning if reconfiguring and current mount point
1170          * already had the flag set
1171          */
1172         if ((fc->purpose & FS_CONTEXT_FOR_RECONFIGURE) &&
1173                         !!(XFS_M(fc->root->d_sb)->m_flags & flag) == value)
1174                 return;
1175         xfs_warn(fc->s_fs_info, "%s mount option is deprecated.", param->key);
1176 }
1177
1178 /*
1179  * Set mount state from a mount option.
1180  *
1181  * NOTE: mp->m_super is NULL here!
1182  */
1183 static int
1184 xfs_fc_parse_param(
1185         struct fs_context       *fc,
1186         struct fs_parameter     *param)
1187 {
1188         struct xfs_mount        *parsing_mp = fc->s_fs_info;
1189         struct fs_parse_result  result;
1190         int                     size = 0;
1191         int                     opt;
1192
1193         opt = fs_parse(fc, xfs_fs_parameters, param, &result);
1194         if (opt < 0)
1195                 return opt;
1196
1197         switch (opt) {
1198         case Opt_logbufs:
1199                 parsing_mp->m_logbufs = result.uint_32;
1200                 return 0;
1201         case Opt_logbsize:
1202                 if (suffix_kstrtoint(param->string, 10, &parsing_mp->m_logbsize))
1203                         return -EINVAL;
1204                 return 0;
1205         case Opt_logdev:
1206                 kfree(parsing_mp->m_logname);
1207                 parsing_mp->m_logname = kstrdup(param->string, GFP_KERNEL);
1208                 if (!parsing_mp->m_logname)
1209                         return -ENOMEM;
1210                 return 0;
1211         case Opt_rtdev:
1212                 kfree(parsing_mp->m_rtname);
1213                 parsing_mp->m_rtname = kstrdup(param->string, GFP_KERNEL);
1214                 if (!parsing_mp->m_rtname)
1215                         return -ENOMEM;
1216                 return 0;
1217         case Opt_allocsize:
1218                 if (suffix_kstrtoint(param->string, 10, &size))
1219                         return -EINVAL;
1220                 parsing_mp->m_allocsize_log = ffs(size) - 1;
1221                 parsing_mp->m_flags |= XFS_MOUNT_ALLOCSIZE;
1222                 return 0;
1223         case Opt_grpid:
1224         case Opt_bsdgroups:
1225                 parsing_mp->m_flags |= XFS_MOUNT_GRPID;
1226                 return 0;
1227         case Opt_nogrpid:
1228         case Opt_sysvgroups:
1229                 parsing_mp->m_flags &= ~XFS_MOUNT_GRPID;
1230                 return 0;
1231         case Opt_wsync:
1232                 parsing_mp->m_flags |= XFS_MOUNT_WSYNC;
1233                 return 0;
1234         case Opt_norecovery:
1235                 parsing_mp->m_flags |= XFS_MOUNT_NORECOVERY;
1236                 return 0;
1237         case Opt_noalign:
1238                 parsing_mp->m_flags |= XFS_MOUNT_NOALIGN;
1239                 return 0;
1240         case Opt_swalloc:
1241                 parsing_mp->m_flags |= XFS_MOUNT_SWALLOC;
1242                 return 0;
1243         case Opt_sunit:
1244                 parsing_mp->m_dalign = result.uint_32;
1245                 return 0;
1246         case Opt_swidth:
1247                 parsing_mp->m_swidth = result.uint_32;
1248                 return 0;
1249         case Opt_inode32:
1250                 parsing_mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1251                 return 0;
1252         case Opt_inode64:
1253                 parsing_mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1254                 return 0;
1255         case Opt_nouuid:
1256                 parsing_mp->m_flags |= XFS_MOUNT_NOUUID;
1257                 return 0;
1258         case Opt_largeio:
1259                 parsing_mp->m_flags |= XFS_MOUNT_LARGEIO;
1260                 return 0;
1261         case Opt_nolargeio:
1262                 parsing_mp->m_flags &= ~XFS_MOUNT_LARGEIO;
1263                 return 0;
1264         case Opt_filestreams:
1265                 parsing_mp->m_flags |= XFS_MOUNT_FILESTREAMS;
1266                 return 0;
1267         case Opt_noquota:
1268                 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
1269                 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
1270                 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
1271                 return 0;
1272         case Opt_quota:
1273         case Opt_uquota:
1274         case Opt_usrquota:
1275                 parsing_mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
1276                                  XFS_UQUOTA_ENFD);
1277                 return 0;
1278         case Opt_qnoenforce:
1279         case Opt_uqnoenforce:
1280                 parsing_mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
1281                 parsing_mp->m_qflags &= ~XFS_UQUOTA_ENFD;
1282                 return 0;
1283         case Opt_pquota:
1284         case Opt_prjquota:
1285                 parsing_mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
1286                                  XFS_PQUOTA_ENFD);
1287                 return 0;
1288         case Opt_pqnoenforce:
1289                 parsing_mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
1290                 parsing_mp->m_qflags &= ~XFS_PQUOTA_ENFD;
1291                 return 0;
1292         case Opt_gquota:
1293         case Opt_grpquota:
1294                 parsing_mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
1295                                  XFS_GQUOTA_ENFD);
1296                 return 0;
1297         case Opt_gqnoenforce:
1298                 parsing_mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
1299                 parsing_mp->m_qflags &= ~XFS_GQUOTA_ENFD;
1300                 return 0;
1301         case Opt_discard:
1302                 parsing_mp->m_flags |= XFS_MOUNT_DISCARD;
1303                 return 0;
1304         case Opt_nodiscard:
1305                 parsing_mp->m_flags &= ~XFS_MOUNT_DISCARD;
1306                 return 0;
1307 #ifdef CONFIG_FS_DAX
1308         case Opt_dax:
1309                 xfs_mount_set_dax_mode(parsing_mp, XFS_DAX_ALWAYS);
1310                 return 0;
1311         case Opt_dax_enum:
1312                 xfs_mount_set_dax_mode(parsing_mp, result.uint_32);
1313                 return 0;
1314 #endif
1315         /* Following mount options will be removed in September 2025 */
1316         case Opt_ikeep:
1317                 xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_IKEEP, true);
1318                 parsing_mp->m_flags |= XFS_MOUNT_IKEEP;
1319                 return 0;
1320         case Opt_noikeep:
1321                 xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_IKEEP, false);
1322                 parsing_mp->m_flags &= ~XFS_MOUNT_IKEEP;
1323                 return 0;
1324         case Opt_attr2:
1325                 xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_ATTR2, true);
1326                 parsing_mp->m_flags |= XFS_MOUNT_ATTR2;
1327                 return 0;
1328         case Opt_noattr2:
1329                 xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_NOATTR2, true);
1330                 parsing_mp->m_flags &= ~XFS_MOUNT_ATTR2;
1331                 parsing_mp->m_flags |= XFS_MOUNT_NOATTR2;
1332                 return 0;
1333         default:
1334                 xfs_warn(parsing_mp, "unknown mount option [%s].", param->key);
1335                 return -EINVAL;
1336         }
1337
1338         return 0;
1339 }
1340
1341 static int
1342 xfs_fc_validate_params(
1343         struct xfs_mount        *mp)
1344 {
1345         /*
1346          * no recovery flag requires a read-only mount
1347          */
1348         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
1349             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
1350                 xfs_warn(mp, "no-recovery mounts must be read-only.");
1351                 return -EINVAL;
1352         }
1353
1354         if ((mp->m_flags & XFS_MOUNT_NOALIGN) &&
1355             (mp->m_dalign || mp->m_swidth)) {
1356                 xfs_warn(mp,
1357         "sunit and swidth options incompatible with the noalign option");
1358                 return -EINVAL;
1359         }
1360
1361         if (!IS_ENABLED(CONFIG_XFS_QUOTA) && mp->m_qflags != 0) {
1362                 xfs_warn(mp, "quota support not available in this kernel.");
1363                 return -EINVAL;
1364         }
1365
1366         if ((mp->m_dalign && !mp->m_swidth) ||
1367             (!mp->m_dalign && mp->m_swidth)) {
1368                 xfs_warn(mp, "sunit and swidth must be specified together");
1369                 return -EINVAL;
1370         }
1371
1372         if (mp->m_dalign && (mp->m_swidth % mp->m_dalign != 0)) {
1373                 xfs_warn(mp,
1374         "stripe width (%d) must be a multiple of the stripe unit (%d)",
1375                         mp->m_swidth, mp->m_dalign);
1376                 return -EINVAL;
1377         }
1378
1379         if (mp->m_logbufs != -1 &&
1380             mp->m_logbufs != 0 &&
1381             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
1382              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
1383                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
1384                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
1385                 return -EINVAL;
1386         }
1387
1388         if (mp->m_logbsize != -1 &&
1389             mp->m_logbsize !=  0 &&
1390             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
1391              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
1392              !is_power_of_2(mp->m_logbsize))) {
1393                 xfs_warn(mp,
1394                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
1395                         mp->m_logbsize);
1396                 return -EINVAL;
1397         }
1398
1399         if ((mp->m_flags & XFS_MOUNT_ALLOCSIZE) &&
1400             (mp->m_allocsize_log > XFS_MAX_IO_LOG ||
1401              mp->m_allocsize_log < XFS_MIN_IO_LOG)) {
1402                 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
1403                         mp->m_allocsize_log, XFS_MIN_IO_LOG, XFS_MAX_IO_LOG);
1404                 return -EINVAL;
1405         }
1406
1407         return 0;
1408 }
1409
1410 static int
1411 xfs_fc_fill_super(
1412         struct super_block      *sb,
1413         struct fs_context       *fc)
1414 {
1415         struct xfs_mount        *mp = sb->s_fs_info;
1416         struct inode            *root;
1417         int                     flags = 0, error;
1418
1419         mp->m_super = sb;
1420
1421         error = xfs_fc_validate_params(mp);
1422         if (error)
1423                 goto out_free_names;
1424
1425         sb_min_blocksize(sb, BBSIZE);
1426         sb->s_xattr = xfs_xattr_handlers;
1427         sb->s_export_op = &xfs_export_operations;
1428 #ifdef CONFIG_XFS_QUOTA
1429         sb->s_qcop = &xfs_quotactl_operations;
1430         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1431 #endif
1432         sb->s_op = &xfs_super_operations;
1433
1434         /*
1435          * Delay mount work if the debug hook is set. This is debug
1436          * instrumention to coordinate simulation of xfs mount failures with
1437          * VFS superblock operations
1438          */
1439         if (xfs_globals.mount_delay) {
1440                 xfs_notice(mp, "Delaying mount for %d seconds.",
1441                         xfs_globals.mount_delay);
1442                 msleep(xfs_globals.mount_delay * 1000);
1443         }
1444
1445         if (fc->sb_flags & SB_SILENT)
1446                 flags |= XFS_MFSI_QUIET;
1447
1448         error = xfs_open_devices(mp);
1449         if (error)
1450                 goto out_free_names;
1451
1452         error = xfs_init_mount_workqueues(mp);
1453         if (error)
1454                 goto out_close_devices;
1455
1456         error = xfs_init_percpu_counters(mp);
1457         if (error)
1458                 goto out_destroy_workqueues;
1459
1460         /* Allocate stats memory before we do operations that might use it */
1461         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1462         if (!mp->m_stats.xs_stats) {
1463                 error = -ENOMEM;
1464                 goto out_destroy_counters;
1465         }
1466
1467         error = xfs_readsb(mp, flags);
1468         if (error)
1469                 goto out_free_stats;
1470
1471         error = xfs_finish_flags(mp);
1472         if (error)
1473                 goto out_free_sb;
1474
1475         error = xfs_setup_devices(mp);
1476         if (error)
1477                 goto out_free_sb;
1478
1479         /* V4 support is undergoing deprecation. */
1480         if (!xfs_sb_version_hascrc(&mp->m_sb)) {
1481 #ifdef CONFIG_XFS_SUPPORT_V4
1482                 xfs_warn_once(mp,
1483         "Deprecated V4 format (crc=0) will not be supported after September 2030.");
1484 #else
1485                 xfs_warn(mp,
1486         "Deprecated V4 format (crc=0) not supported by kernel.");
1487                 error = -EINVAL;
1488                 goto out_free_sb;
1489 #endif
1490         }
1491
1492         /*
1493          * XFS block mappings use 54 bits to store the logical block offset.
1494          * This should suffice to handle the maximum file size that the VFS
1495          * supports (currently 2^63 bytes on 64-bit and ULONG_MAX << PAGE_SHIFT
1496          * bytes on 32-bit), but as XFS and VFS have gotten the s_maxbytes
1497          * calculation wrong on 32-bit kernels in the past, we'll add a WARN_ON
1498          * to check this assertion.
1499          *
1500          * Avoid integer overflow by comparing the maximum bmbt offset to the
1501          * maximum pagecache offset in units of fs blocks.
1502          */
1503         if (XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE) > XFS_MAX_FILEOFF) {
1504                 xfs_warn(mp,
1505 "MAX_LFS_FILESIZE block offset (%llu) exceeds extent map maximum (%llu)!",
1506                          XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE),
1507                          XFS_MAX_FILEOFF);
1508                 error = -EINVAL;
1509                 goto out_free_sb;
1510         }
1511
1512         error = xfs_filestream_mount(mp);
1513         if (error)
1514                 goto out_free_sb;
1515
1516         /*
1517          * we must configure the block size in the superblock before we run the
1518          * full mount process as the mount process can lookup and cache inodes.
1519          */
1520         sb->s_magic = XFS_SUPER_MAGIC;
1521         sb->s_blocksize = mp->m_sb.sb_blocksize;
1522         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1523         sb->s_maxbytes = MAX_LFS_FILESIZE;
1524         sb->s_max_links = XFS_MAXLINK;
1525         sb->s_time_gran = 1;
1526         if (xfs_sb_version_hasbigtime(&mp->m_sb)) {
1527                 sb->s_time_min = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MIN);
1528                 sb->s_time_max = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MAX);
1529         } else {
1530                 sb->s_time_min = XFS_LEGACY_TIME_MIN;
1531                 sb->s_time_max = XFS_LEGACY_TIME_MAX;
1532         }
1533         trace_xfs_inode_timestamp_range(mp, sb->s_time_min, sb->s_time_max);
1534         sb->s_iflags |= SB_I_CGROUPWB;
1535
1536         set_posix_acl_flag(sb);
1537
1538         /* version 5 superblocks support inode version counters. */
1539         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1540                 sb->s_flags |= SB_I_VERSION;
1541
1542         if (xfs_sb_version_hasbigtime(&mp->m_sb))
1543                 xfs_warn(mp,
1544  "EXPERIMENTAL big timestamp feature in use. Use at your own risk!");
1545
1546         if (mp->m_flags & XFS_MOUNT_DAX_ALWAYS) {
1547                 bool rtdev_is_dax = false, datadev_is_dax;
1548
1549                 xfs_warn(mp,
1550                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1551
1552                 datadev_is_dax = bdev_dax_supported(mp->m_ddev_targp->bt_bdev,
1553                         sb->s_blocksize);
1554                 if (mp->m_rtdev_targp)
1555                         rtdev_is_dax = bdev_dax_supported(
1556                                 mp->m_rtdev_targp->bt_bdev, sb->s_blocksize);
1557                 if (!rtdev_is_dax && !datadev_is_dax) {
1558                         xfs_alert(mp,
1559                         "DAX unsupported by block device. Turning off DAX.");
1560                         xfs_mount_set_dax_mode(mp, XFS_DAX_NEVER);
1561                 }
1562                 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1563                         xfs_alert(mp,
1564                 "DAX and reflink cannot be used together!");
1565                         error = -EINVAL;
1566                         goto out_filestream_unmount;
1567                 }
1568         }
1569
1570         if (mp->m_flags & XFS_MOUNT_DISCARD) {
1571                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1572
1573                 if (!blk_queue_discard(q)) {
1574                         xfs_warn(mp, "mounting with \"discard\" option, but "
1575                                         "the device does not support discard");
1576                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
1577                 }
1578         }
1579
1580         if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1581                 if (mp->m_sb.sb_rblocks) {
1582                         xfs_alert(mp,
1583         "reflink not compatible with realtime device!");
1584                         error = -EINVAL;
1585                         goto out_filestream_unmount;
1586                 }
1587
1588                 if (xfs_globals.always_cow) {
1589                         xfs_info(mp, "using DEBUG-only always_cow mode.");
1590                         mp->m_always_cow = true;
1591                 }
1592         }
1593
1594         if (xfs_sb_version_hasrmapbt(&mp->m_sb) && mp->m_sb.sb_rblocks) {
1595                 xfs_alert(mp,
1596         "reverse mapping btree not compatible with realtime device!");
1597                 error = -EINVAL;
1598                 goto out_filestream_unmount;
1599         }
1600
1601         if (xfs_sb_version_hasinobtcounts(&mp->m_sb))
1602                 xfs_warn(mp,
1603  "EXPERIMENTAL inode btree counters feature in use. Use at your own risk!");
1604
1605         error = xfs_mountfs(mp);
1606         if (error)
1607                 goto out_filestream_unmount;
1608
1609         root = igrab(VFS_I(mp->m_rootip));
1610         if (!root) {
1611                 error = -ENOENT;
1612                 goto out_unmount;
1613         }
1614         sb->s_root = d_make_root(root);
1615         if (!sb->s_root) {
1616                 error = -ENOMEM;
1617                 goto out_unmount;
1618         }
1619
1620         return 0;
1621
1622  out_filestream_unmount:
1623         xfs_filestream_unmount(mp);
1624  out_free_sb:
1625         xfs_freesb(mp);
1626  out_free_stats:
1627         free_percpu(mp->m_stats.xs_stats);
1628  out_destroy_counters:
1629         xfs_destroy_percpu_counters(mp);
1630  out_destroy_workqueues:
1631         xfs_destroy_mount_workqueues(mp);
1632  out_close_devices:
1633         xfs_close_devices(mp);
1634  out_free_names:
1635         sb->s_fs_info = NULL;
1636         xfs_mount_free(mp);
1637         return error;
1638
1639  out_unmount:
1640         xfs_filestream_unmount(mp);
1641         xfs_unmountfs(mp);
1642         goto out_free_sb;
1643 }
1644
1645 static int
1646 xfs_fc_get_tree(
1647         struct fs_context       *fc)
1648 {
1649         return get_tree_bdev(fc, xfs_fc_fill_super);
1650 }
1651
1652 static int
1653 xfs_remount_rw(
1654         struct xfs_mount        *mp)
1655 {
1656         struct xfs_sb           *sbp = &mp->m_sb;
1657         int error;
1658
1659         if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1660                 xfs_warn(mp,
1661                         "ro->rw transition prohibited on norecovery mount");
1662                 return -EINVAL;
1663         }
1664
1665         if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1666             xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1667                 xfs_warn(mp,
1668         "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1669                         (sbp->sb_features_ro_compat &
1670                                 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1671                 return -EINVAL;
1672         }
1673
1674         mp->m_flags &= ~XFS_MOUNT_RDONLY;
1675
1676         /*
1677          * If this is the first remount to writeable state we might have some
1678          * superblock changes to update.
1679          */
1680         if (mp->m_update_sb) {
1681                 error = xfs_sync_sb(mp, false);
1682                 if (error) {
1683                         xfs_warn(mp, "failed to write sb changes");
1684                         return error;
1685                 }
1686                 mp->m_update_sb = false;
1687         }
1688
1689         /*
1690          * Fill out the reserve pool if it is empty. Use the stashed value if
1691          * it is non-zero, otherwise go with the default.
1692          */
1693         xfs_restore_resvblks(mp);
1694         xfs_log_work_queue(mp);
1695
1696         /* Recover any CoW blocks that never got remapped. */
1697         error = xfs_reflink_recover_cow(mp);
1698         if (error) {
1699                 xfs_err(mp,
1700                         "Error %d recovering leftover CoW allocations.", error);
1701                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1702                 return error;
1703         }
1704         xfs_start_block_reaping(mp);
1705
1706         /* Create the per-AG metadata reservation pool .*/
1707         error = xfs_fs_reserve_ag_blocks(mp);
1708         if (error && error != -ENOSPC)
1709                 return error;
1710
1711         return 0;
1712 }
1713
1714 static int
1715 xfs_remount_ro(
1716         struct xfs_mount        *mp)
1717 {
1718         struct xfs_eofblocks    eofb = {
1719                 .eof_flags      = XFS_EOF_FLAGS_SYNC,
1720         };
1721         int                     error;
1722
1723         /* Flush all the dirty data to disk. */
1724         error = sync_filesystem(mp->m_super);
1725         if (error)
1726                 return error;
1727
1728         /*
1729          * Cancel background eofb scanning so it cannot race with the final
1730          * log force+buftarg wait and deadlock the remount.
1731          */
1732         xfs_stop_block_reaping(mp);
1733
1734         /*
1735          * Clear out all remaining COW staging extents and speculative post-EOF
1736          * preallocations so that we don't leave inodes requiring inactivation
1737          * cleanups during reclaim on a read-only mount.  We must process every
1738          * cached inode, so this requires a synchronous cache scan.
1739          */
1740         error = xfs_icache_free_cowblocks(mp, &eofb);
1741         if (error) {
1742                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1743                 return error;
1744         }
1745
1746         /* Free the per-AG metadata reservation pool. */
1747         error = xfs_fs_unreserve_ag_blocks(mp);
1748         if (error) {
1749                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1750                 return error;
1751         }
1752
1753         /*
1754          * Before we sync the metadata, we need to free up the reserve block
1755          * pool so that the used block count in the superblock on disk is
1756          * correct at the end of the remount. Stash the current* reserve pool
1757          * size so that if we get remounted rw, we can return it to the same
1758          * size.
1759          */
1760         xfs_save_resvblks(mp);
1761
1762         xfs_quiesce_attr(mp);
1763         mp->m_flags |= XFS_MOUNT_RDONLY;
1764
1765         return 0;
1766 }
1767
1768 /*
1769  * Logically we would return an error here to prevent users from believing
1770  * they might have changed mount options using remount which can't be changed.
1771  *
1772  * But unfortunately mount(8) adds all options from mtab and fstab to the mount
1773  * arguments in some cases so we can't blindly reject options, but have to
1774  * check for each specified option if it actually differs from the currently
1775  * set option and only reject it if that's the case.
1776  *
1777  * Until that is implemented we return success for every remount request, and
1778  * silently ignore all options that we can't actually change.
1779  */
1780 static int
1781 xfs_fc_reconfigure(
1782         struct fs_context *fc)
1783 {
1784         struct xfs_mount        *mp = XFS_M(fc->root->d_sb);
1785         struct xfs_mount        *new_mp = fc->s_fs_info;
1786         xfs_sb_t                *sbp = &mp->m_sb;
1787         int                     flags = fc->sb_flags;
1788         int                     error;
1789
1790         /* version 5 superblocks always support version counters. */
1791         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1792                 fc->sb_flags |= SB_I_VERSION;
1793
1794         error = xfs_fc_validate_params(new_mp);
1795         if (error)
1796                 return error;
1797
1798         /* inode32 -> inode64 */
1799         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) &&
1800             !(new_mp->m_flags & XFS_MOUNT_SMALL_INUMS)) {
1801                 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1802                 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1803         }
1804
1805         /* inode64 -> inode32 */
1806         if (!(mp->m_flags & XFS_MOUNT_SMALL_INUMS) &&
1807             (new_mp->m_flags & XFS_MOUNT_SMALL_INUMS)) {
1808                 mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1809                 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1810         }
1811
1812         /* ro -> rw */
1813         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(flags & SB_RDONLY)) {
1814                 error = xfs_remount_rw(mp);
1815                 if (error)
1816                         return error;
1817         }
1818
1819         /* rw -> ro */
1820         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (flags & SB_RDONLY)) {
1821                 error = xfs_remount_ro(mp);
1822                 if (error)
1823                         return error;
1824         }
1825
1826         return 0;
1827 }
1828
1829 static void xfs_fc_free(
1830         struct fs_context       *fc)
1831 {
1832         struct xfs_mount        *mp = fc->s_fs_info;
1833
1834         /*
1835          * mp is stored in the fs_context when it is initialized.
1836          * mp is transferred to the superblock on a successful mount,
1837          * but if an error occurs before the transfer we have to free
1838          * it here.
1839          */
1840         if (mp)
1841                 xfs_mount_free(mp);
1842 }
1843
1844 static const struct fs_context_operations xfs_context_ops = {
1845         .parse_param = xfs_fc_parse_param,
1846         .get_tree    = xfs_fc_get_tree,
1847         .reconfigure = xfs_fc_reconfigure,
1848         .free        = xfs_fc_free,
1849 };
1850
1851 static int xfs_init_fs_context(
1852         struct fs_context       *fc)
1853 {
1854         struct xfs_mount        *mp;
1855
1856         mp = kmem_alloc(sizeof(struct xfs_mount), KM_ZERO);
1857         if (!mp)
1858                 return -ENOMEM;
1859
1860         spin_lock_init(&mp->m_sb_lock);
1861         spin_lock_init(&mp->m_agirotor_lock);
1862         INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
1863         spin_lock_init(&mp->m_perag_lock);
1864         mutex_init(&mp->m_growlock);
1865         INIT_WORK(&mp->m_flush_inodes_work, xfs_flush_inodes_worker);
1866         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1867         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1868         INIT_DELAYED_WORK(&mp->m_cowblocks_work, xfs_cowblocks_worker);
1869         mp->m_kobj.kobject.kset = xfs_kset;
1870         /*
1871          * We don't create the finobt per-ag space reservation until after log
1872          * recovery, so we must set this to true so that an ifree transaction
1873          * started during log recovery will not depend on space reservations
1874          * for finobt expansion.
1875          */
1876         mp->m_finobt_nores = true;
1877
1878         /*
1879          * These can be overridden by the mount option parsing.
1880          */
1881         mp->m_logbufs = -1;
1882         mp->m_logbsize = -1;
1883         mp->m_allocsize_log = 16; /* 64k */
1884
1885         /*
1886          * Copy binary VFS mount flags we are interested in.
1887          */
1888         if (fc->sb_flags & SB_RDONLY)
1889                 mp->m_flags |= XFS_MOUNT_RDONLY;
1890         if (fc->sb_flags & SB_DIRSYNC)
1891                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
1892         if (fc->sb_flags & SB_SYNCHRONOUS)
1893                 mp->m_flags |= XFS_MOUNT_WSYNC;
1894
1895         fc->s_fs_info = mp;
1896         fc->ops = &xfs_context_ops;
1897
1898         return 0;
1899 }
1900
1901 static struct file_system_type xfs_fs_type = {
1902         .owner                  = THIS_MODULE,
1903         .name                   = "xfs",
1904         .init_fs_context        = xfs_init_fs_context,
1905         .parameters             = xfs_fs_parameters,
1906         .kill_sb                = kill_block_super,
1907         .fs_flags               = FS_REQUIRES_DEV,
1908 };
1909 MODULE_ALIAS_FS("xfs");
1910
1911 STATIC int __init
1912 xfs_init_zones(void)
1913 {
1914         xfs_log_ticket_zone = kmem_cache_create("xfs_log_ticket",
1915                                                 sizeof(struct xlog_ticket),
1916                                                 0, 0, NULL);
1917         if (!xfs_log_ticket_zone)
1918                 goto out;
1919
1920         xfs_bmap_free_item_zone = kmem_cache_create("xfs_bmap_free_item",
1921                                         sizeof(struct xfs_extent_free_item),
1922                                         0, 0, NULL);
1923         if (!xfs_bmap_free_item_zone)
1924                 goto out_destroy_log_ticket_zone;
1925
1926         xfs_btree_cur_zone = kmem_cache_create("xfs_btree_cur",
1927                                                sizeof(struct xfs_btree_cur),
1928                                                0, 0, NULL);
1929         if (!xfs_btree_cur_zone)
1930                 goto out_destroy_bmap_free_item_zone;
1931
1932         xfs_da_state_zone = kmem_cache_create("xfs_da_state",
1933                                               sizeof(struct xfs_da_state),
1934                                               0, 0, NULL);
1935         if (!xfs_da_state_zone)
1936                 goto out_destroy_btree_cur_zone;
1937
1938         xfs_ifork_zone = kmem_cache_create("xfs_ifork",
1939                                            sizeof(struct xfs_ifork),
1940                                            0, 0, NULL);
1941         if (!xfs_ifork_zone)
1942                 goto out_destroy_da_state_zone;
1943
1944         xfs_trans_zone = kmem_cache_create("xfs_trans",
1945                                            sizeof(struct xfs_trans),
1946                                            0, 0, NULL);
1947         if (!xfs_trans_zone)
1948                 goto out_destroy_ifork_zone;
1949
1950
1951         /*
1952          * The size of the zone allocated buf log item is the maximum
1953          * size possible under XFS.  This wastes a little bit of memory,
1954          * but it is much faster.
1955          */
1956         xfs_buf_item_zone = kmem_cache_create("xfs_buf_item",
1957                                               sizeof(struct xfs_buf_log_item),
1958                                               0, 0, NULL);
1959         if (!xfs_buf_item_zone)
1960                 goto out_destroy_trans_zone;
1961
1962         xfs_efd_zone = kmem_cache_create("xfs_efd_item",
1963                                         (sizeof(struct xfs_efd_log_item) +
1964                                         (XFS_EFD_MAX_FAST_EXTENTS - 1) *
1965                                         sizeof(struct xfs_extent)),
1966                                         0, 0, NULL);
1967         if (!xfs_efd_zone)
1968                 goto out_destroy_buf_item_zone;
1969
1970         xfs_efi_zone = kmem_cache_create("xfs_efi_item",
1971                                          (sizeof(struct xfs_efi_log_item) +
1972                                          (XFS_EFI_MAX_FAST_EXTENTS - 1) *
1973                                          sizeof(struct xfs_extent)),
1974                                          0, 0, NULL);
1975         if (!xfs_efi_zone)
1976                 goto out_destroy_efd_zone;
1977
1978         xfs_inode_zone = kmem_cache_create("xfs_inode",
1979                                            sizeof(struct xfs_inode), 0,
1980                                            (SLAB_HWCACHE_ALIGN |
1981                                             SLAB_RECLAIM_ACCOUNT |
1982                                             SLAB_MEM_SPREAD | SLAB_ACCOUNT),
1983                                            xfs_fs_inode_init_once);
1984         if (!xfs_inode_zone)
1985                 goto out_destroy_efi_zone;
1986
1987         xfs_ili_zone = kmem_cache_create("xfs_ili",
1988                                          sizeof(struct xfs_inode_log_item), 0,
1989                                          SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
1990                                          NULL);
1991         if (!xfs_ili_zone)
1992                 goto out_destroy_inode_zone;
1993
1994         xfs_icreate_zone = kmem_cache_create("xfs_icr",
1995                                              sizeof(struct xfs_icreate_item),
1996                                              0, 0, NULL);
1997         if (!xfs_icreate_zone)
1998                 goto out_destroy_ili_zone;
1999
2000         xfs_rud_zone = kmem_cache_create("xfs_rud_item",
2001                                          sizeof(struct xfs_rud_log_item),
2002                                          0, 0, NULL);
2003         if (!xfs_rud_zone)
2004                 goto out_destroy_icreate_zone;
2005
2006         xfs_rui_zone = kmem_cache_create("xfs_rui_item",
2007                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
2008                         0, 0, NULL);
2009         if (!xfs_rui_zone)
2010                 goto out_destroy_rud_zone;
2011
2012         xfs_cud_zone = kmem_cache_create("xfs_cud_item",
2013                                          sizeof(struct xfs_cud_log_item),
2014                                          0, 0, NULL);
2015         if (!xfs_cud_zone)
2016                 goto out_destroy_rui_zone;
2017
2018         xfs_cui_zone = kmem_cache_create("xfs_cui_item",
2019                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
2020                         0, 0, NULL);
2021         if (!xfs_cui_zone)
2022                 goto out_destroy_cud_zone;
2023
2024         xfs_bud_zone = kmem_cache_create("xfs_bud_item",
2025                                          sizeof(struct xfs_bud_log_item),
2026                                          0, 0, NULL);
2027         if (!xfs_bud_zone)
2028                 goto out_destroy_cui_zone;
2029
2030         xfs_bui_zone = kmem_cache_create("xfs_bui_item",
2031                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
2032                         0, 0, NULL);
2033         if (!xfs_bui_zone)
2034                 goto out_destroy_bud_zone;
2035
2036         return 0;
2037
2038  out_destroy_bud_zone:
2039         kmem_cache_destroy(xfs_bud_zone);
2040  out_destroy_cui_zone:
2041         kmem_cache_destroy(xfs_cui_zone);
2042  out_destroy_cud_zone:
2043         kmem_cache_destroy(xfs_cud_zone);
2044  out_destroy_rui_zone:
2045         kmem_cache_destroy(xfs_rui_zone);
2046  out_destroy_rud_zone:
2047         kmem_cache_destroy(xfs_rud_zone);
2048  out_destroy_icreate_zone:
2049         kmem_cache_destroy(xfs_icreate_zone);
2050  out_destroy_ili_zone:
2051         kmem_cache_destroy(xfs_ili_zone);
2052  out_destroy_inode_zone:
2053         kmem_cache_destroy(xfs_inode_zone);
2054  out_destroy_efi_zone:
2055         kmem_cache_destroy(xfs_efi_zone);
2056  out_destroy_efd_zone:
2057         kmem_cache_destroy(xfs_efd_zone);
2058  out_destroy_buf_item_zone:
2059         kmem_cache_destroy(xfs_buf_item_zone);
2060  out_destroy_trans_zone:
2061         kmem_cache_destroy(xfs_trans_zone);
2062  out_destroy_ifork_zone:
2063         kmem_cache_destroy(xfs_ifork_zone);
2064  out_destroy_da_state_zone:
2065         kmem_cache_destroy(xfs_da_state_zone);
2066  out_destroy_btree_cur_zone:
2067         kmem_cache_destroy(xfs_btree_cur_zone);
2068  out_destroy_bmap_free_item_zone:
2069         kmem_cache_destroy(xfs_bmap_free_item_zone);
2070  out_destroy_log_ticket_zone:
2071         kmem_cache_destroy(xfs_log_ticket_zone);
2072  out:
2073         return -ENOMEM;
2074 }
2075
2076 STATIC void
2077 xfs_destroy_zones(void)
2078 {
2079         /*
2080          * Make sure all delayed rcu free are flushed before we
2081          * destroy caches.
2082          */
2083         rcu_barrier();
2084         kmem_cache_destroy(xfs_bui_zone);
2085         kmem_cache_destroy(xfs_bud_zone);
2086         kmem_cache_destroy(xfs_cui_zone);
2087         kmem_cache_destroy(xfs_cud_zone);
2088         kmem_cache_destroy(xfs_rui_zone);
2089         kmem_cache_destroy(xfs_rud_zone);
2090         kmem_cache_destroy(xfs_icreate_zone);
2091         kmem_cache_destroy(xfs_ili_zone);
2092         kmem_cache_destroy(xfs_inode_zone);
2093         kmem_cache_destroy(xfs_efi_zone);
2094         kmem_cache_destroy(xfs_efd_zone);
2095         kmem_cache_destroy(xfs_buf_item_zone);
2096         kmem_cache_destroy(xfs_trans_zone);
2097         kmem_cache_destroy(xfs_ifork_zone);
2098         kmem_cache_destroy(xfs_da_state_zone);
2099         kmem_cache_destroy(xfs_btree_cur_zone);
2100         kmem_cache_destroy(xfs_bmap_free_item_zone);
2101         kmem_cache_destroy(xfs_log_ticket_zone);
2102 }
2103
2104 STATIC int __init
2105 xfs_init_workqueues(void)
2106 {
2107         /*
2108          * The allocation workqueue can be used in memory reclaim situations
2109          * (writepage path), and parallelism is only limited by the number of
2110          * AGs in all the filesystems mounted. Hence use the default large
2111          * max_active value for this workqueue.
2112          */
2113         xfs_alloc_wq = alloc_workqueue("xfsalloc",
2114                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
2115         if (!xfs_alloc_wq)
2116                 return -ENOMEM;
2117
2118         xfs_discard_wq = alloc_workqueue("xfsdiscard", WQ_UNBOUND, 0);
2119         if (!xfs_discard_wq)
2120                 goto out_free_alloc_wq;
2121
2122         return 0;
2123 out_free_alloc_wq:
2124         destroy_workqueue(xfs_alloc_wq);
2125         return -ENOMEM;
2126 }
2127
2128 STATIC void
2129 xfs_destroy_workqueues(void)
2130 {
2131         destroy_workqueue(xfs_discard_wq);
2132         destroy_workqueue(xfs_alloc_wq);
2133 }
2134
2135 STATIC int __init
2136 init_xfs_fs(void)
2137 {
2138         int                     error;
2139
2140         xfs_check_ondisk_structs();
2141
2142         printk(KERN_INFO XFS_VERSION_STRING " with "
2143                          XFS_BUILD_OPTIONS " enabled\n");
2144
2145         xfs_dir_startup();
2146
2147         error = xfs_init_zones();
2148         if (error)
2149                 goto out;
2150
2151         error = xfs_init_workqueues();
2152         if (error)
2153                 goto out_destroy_zones;
2154
2155         error = xfs_mru_cache_init();
2156         if (error)
2157                 goto out_destroy_wq;
2158
2159         error = xfs_buf_init();
2160         if (error)
2161                 goto out_mru_cache_uninit;
2162
2163         error = xfs_init_procfs();
2164         if (error)
2165                 goto out_buf_terminate;
2166
2167         error = xfs_sysctl_register();
2168         if (error)
2169                 goto out_cleanup_procfs;
2170
2171         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2172         if (!xfs_kset) {
2173                 error = -ENOMEM;
2174                 goto out_sysctl_unregister;
2175         }
2176
2177         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2178
2179         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2180         if (!xfsstats.xs_stats) {
2181                 error = -ENOMEM;
2182                 goto out_kset_unregister;
2183         }
2184
2185         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2186                                "stats");
2187         if (error)
2188                 goto out_free_stats;
2189
2190 #ifdef DEBUG
2191         xfs_dbg_kobj.kobject.kset = xfs_kset;
2192         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2193         if (error)
2194                 goto out_remove_stats_kobj;
2195 #endif
2196
2197         error = xfs_qm_init();
2198         if (error)
2199                 goto out_remove_dbg_kobj;
2200
2201         error = register_filesystem(&xfs_fs_type);
2202         if (error)
2203                 goto out_qm_exit;
2204         return 0;
2205
2206  out_qm_exit:
2207         xfs_qm_exit();
2208  out_remove_dbg_kobj:
2209 #ifdef DEBUG
2210         xfs_sysfs_del(&xfs_dbg_kobj);
2211  out_remove_stats_kobj:
2212 #endif
2213         xfs_sysfs_del(&xfsstats.xs_kobj);
2214  out_free_stats:
2215         free_percpu(xfsstats.xs_stats);
2216  out_kset_unregister:
2217         kset_unregister(xfs_kset);
2218  out_sysctl_unregister:
2219         xfs_sysctl_unregister();
2220  out_cleanup_procfs:
2221         xfs_cleanup_procfs();
2222  out_buf_terminate:
2223         xfs_buf_terminate();
2224  out_mru_cache_uninit:
2225         xfs_mru_cache_uninit();
2226  out_destroy_wq:
2227         xfs_destroy_workqueues();
2228  out_destroy_zones:
2229         xfs_destroy_zones();
2230  out:
2231         return error;
2232 }
2233
2234 STATIC void __exit
2235 exit_xfs_fs(void)
2236 {
2237         xfs_qm_exit();
2238         unregister_filesystem(&xfs_fs_type);
2239 #ifdef DEBUG
2240         xfs_sysfs_del(&xfs_dbg_kobj);
2241 #endif
2242         xfs_sysfs_del(&xfsstats.xs_kobj);
2243         free_percpu(xfsstats.xs_stats);
2244         kset_unregister(xfs_kset);
2245         xfs_sysctl_unregister();
2246         xfs_cleanup_procfs();
2247         xfs_buf_terminate();
2248         xfs_mru_cache_uninit();
2249         xfs_destroy_workqueues();
2250         xfs_destroy_zones();
2251         xfs_uuid_table_free();
2252 }
2253
2254 module_init(init_xfs_fs);
2255 module_exit(exit_xfs_fs);
2256
2257 MODULE_AUTHOR("Silicon Graphics, Inc.");
2258 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2259 MODULE_LICENSE("GPL");