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 /*
  51  * Table driven mount option parser.
  52  */
  53 enum {
  54         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev,
  55         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
  56         Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
  57         Opt_allocsize, Opt_norecovery, Opt_inode64, Opt_inode32, Opt_ikeep,
  58         Opt_noikeep, Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2,
  59         Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
  60         Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
  61         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
  62         Opt_discard, Opt_nodiscard, Opt_dax,
  63 };
  64
  65 static const struct fs_parameter_spec xfs_fs_parameters[] = {
  66         fsparam_u32("logbufs",          Opt_logbufs),
  67         fsparam_string("logbsize",      Opt_logbsize),
  68         fsparam_string("logdev",        Opt_logdev),
  69         fsparam_string("rtdev",         Opt_rtdev),
  70         fsparam_flag("wsync",           Opt_wsync),
  71         fsparam_flag("noalign",         Opt_noalign),
  72         fsparam_flag("swalloc",         Opt_swalloc),
  73         fsparam_u32("sunit",            Opt_sunit),
  74         fsparam_u32("swidth",           Opt_swidth),
  75         fsparam_flag("nouuid",          Opt_nouuid),
  76         fsparam_flag("grpid",           Opt_grpid),
  77         fsparam_flag("nogrpid",         Opt_nogrpid),
  78         fsparam_flag("bsdgroups",       Opt_bsdgroups),
  79         fsparam_flag("sysvgroups",      Opt_sysvgroups),
  80         fsparam_string("allocsize",     Opt_allocsize),
  81         fsparam_flag("norecovery",      Opt_norecovery),
  82         fsparam_flag("inode64",         Opt_inode64),
  83         fsparam_flag("inode32",         Opt_inode32),
  84         fsparam_flag("ikeep",           Opt_ikeep),
  85         fsparam_flag("noikeep",         Opt_noikeep),
  86         fsparam_flag("largeio",         Opt_largeio),
  87         fsparam_flag("nolargeio",       Opt_nolargeio),
  88         fsparam_flag("attr2",           Opt_attr2),
  89         fsparam_flag("noattr2",         Opt_noattr2),
  90         fsparam_flag("filestreams",     Opt_filestreams),
  91         fsparam_flag("quota",           Opt_quota),
  92         fsparam_flag("noquota",         Opt_noquota),
  93         fsparam_flag("usrquota",        Opt_usrquota),
  94         fsparam_flag("grpquota",        Opt_grpquota),
  95         fsparam_flag("prjquota",        Opt_prjquota),
  96         fsparam_flag("uquota",          Opt_uquota),
  97         fsparam_flag("gquota",          Opt_gquota),
  98         fsparam_flag("pquota",          Opt_pquota),
  99         fsparam_flag("uqnoenforce",     Opt_uqnoenforce),
 100         fsparam_flag("gqnoenforce",     Opt_gqnoenforce),
 101         fsparam_flag("pqnoenforce",     Opt_pqnoenforce),
 102         fsparam_flag("qnoenforce",      Opt_qnoenforce),
 103         fsparam_flag("discard",         Opt_discard),
 104         fsparam_flag("nodiscard",       Opt_nodiscard),
 105         fsparam_flag("dax",             Opt_dax),
 106         {}
 107 };
 108
 109 struct proc_xfs_info {
 110         uint64_t        flag;
 111         char            *str;
 112 };
 113
 114 static int
 115 xfs_fs_show_options(
 116         struct seq_file         *m,
 117         struct dentry           *root)
 118 {
 119         static struct proc_xfs_info xfs_info_set[] = {
 120                 /* the few simple ones we can get from the mount struct */
 121                 { XFS_MOUNT_IKEEP,              ",ikeep" },
 122                 { XFS_MOUNT_WSYNC,              ",wsync" },
 123                 { XFS_MOUNT_NOALIGN,            ",noalign" },
 124                 { XFS_MOUNT_SWALLOC,            ",swalloc" },
 125                 { XFS_MOUNT_NOUUID,             ",nouuid" },
 126                 { XFS_MOUNT_NORECOVERY,         ",norecovery" },
 127                 { XFS_MOUNT_ATTR2,              ",attr2" },
 128                 { XFS_MOUNT_FILESTREAMS,        ",filestreams" },
 129                 { XFS_MOUNT_GRPID,              ",grpid" },
 130                 { XFS_MOUNT_DISCARD,            ",discard" },
 131                 { XFS_MOUNT_LARGEIO,            ",largeio" },
 132                 { XFS_MOUNT_DAX,                ",dax" },
 133                 { 0, NULL }
 134         };
 135         struct xfs_mount        *mp = XFS_M(root->d_sb);
 136         struct proc_xfs_info    *xfs_infop;
 137
 138         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
 139                 if (mp->m_flags & xfs_infop->flag)
 140                         seq_puts(m, xfs_infop->str);
 141         }
 142
 143         seq_printf(m, ",inode%d",
 144                 (mp->m_flags & XFS_MOUNT_SMALL_INUMS) ? 32 : 64);
 145
 146         if (mp->m_flags & XFS_MOUNT_ALLOCSIZE)
 147                 seq_printf(m, ",allocsize=%dk",
 148                            (1 << mp->m_allocsize_log) >> 10);
 149
 150         if (mp->m_logbufs > 0)
 151                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
 152         if (mp->m_logbsize > 0)
 153                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
 154
 155         if (mp->m_logname)
 156                 seq_show_option(m, "logdev", mp->m_logname);
 157         if (mp->m_rtname)
 158                 seq_show_option(m, "rtdev", mp->m_rtname);
 159
 160         if (mp->m_dalign > 0)
 161                 seq_printf(m, ",sunit=%d",
 162                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
 163         if (mp->m_swidth > 0)
 164                 seq_printf(m, ",swidth=%d",
 165                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
 166
 167         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
 168                 seq_puts(m, ",usrquota");
 169         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
 170                 seq_puts(m, ",uqnoenforce");
 171
 172         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
 173                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
 174                         seq_puts(m, ",prjquota");
 175                 else
 176                         seq_puts(m, ",pqnoenforce");
 177         }
 178         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
 179                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
 180                         seq_puts(m, ",grpquota");
 181                 else
 182                         seq_puts(m, ",gqnoenforce");
 183         }
 184
 185         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
 186                 seq_puts(m, ",noquota");
 187
 188         return 0;
 189 }
 190
 191 /*
 192  * Set parameters for inode allocation heuristics, taking into account
 193  * filesystem size and inode32/inode64 mount options; i.e. specifically
 194  * whether or not XFS_MOUNT_SMALL_INUMS is set.
 195  *
 196  * Inode allocation patterns are altered only if inode32 is requested
 197  * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
 198  * If altered, XFS_MOUNT_32BITINODES is set as well.
 199  *
 200  * An agcount independent of that in the mount structure is provided
 201  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
 202  * to the potentially higher ag count.
 203  *
 204  * Returns the maximum AG index which may contain inodes.
 205  */
 206 xfs_agnumber_t
 207 xfs_set_inode_alloc(
 208         struct xfs_mount *mp,
 209         xfs_agnumber_t  agcount)
 210 {
 211         xfs_agnumber_t  index;
 212         xfs_agnumber_t  maxagi = 0;
 213         xfs_sb_t        *sbp = &mp->m_sb;
 214         xfs_agnumber_t  max_metadata;
 215         xfs_agino_t     agino;
 216         xfs_ino_t       ino;
 217
 218         /*
 219          * Calculate how much should be reserved for inodes to meet
 220          * the max inode percentage.  Used only for inode32.
 221          */
 222         if (M_IGEO(mp)->maxicount) {
 223                 uint64_t        icount;
 224
 225                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
 226                 do_div(icount, 100);
 227                 icount += sbp->sb_agblocks - 1;
 228                 do_div(icount, sbp->sb_agblocks);
 229                 max_metadata = icount;
 230         } else {
 231                 max_metadata = agcount;
 232         }
 233
 234         /* Get the last possible inode in the filesystem */
 235         agino = XFS_AGB_TO_AGINO(mp, sbp->sb_agblocks - 1);
 236         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
 237
 238         /*
 239          * If user asked for no more than 32-bit inodes, and the fs is
 240          * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
 241          * the allocator to accommodate the request.
 242          */
 243         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
 244                 mp->m_flags |= XFS_MOUNT_32BITINODES;
 245         else
 246                 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
 247
 248         for (index = 0; index < agcount; index++) {
 249                 struct xfs_perag        *pag;
 250
 251                 ino = XFS_AGINO_TO_INO(mp, index, agino);
 252
 253                 pag = xfs_perag_get(mp, index);
 254
 255                 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
 256                         if (ino > XFS_MAXINUMBER_32) {
 257                                 pag->pagi_inodeok = 0;
 258                                 pag->pagf_metadata = 0;
 259                         } else {
 260                                 pag->pagi_inodeok = 1;
 261                                 maxagi++;
 262                                 if (index < max_metadata)
 263                                         pag->pagf_metadata = 1;
 264                                 else
 265                                         pag->pagf_metadata = 0;
 266                         }
 267                 } else {
 268                         pag->pagi_inodeok = 1;
 269                         pag->pagf_metadata = 0;
 270                 }
 271
 272                 xfs_perag_put(pag);
 273         }
 274
 275         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
 276 }
 277
 278 STATIC int
 279 xfs_blkdev_get(
 280         xfs_mount_t             *mp,
 281         const char              *name,
 282         struct block_device     **bdevp)
 283 {
 284         int                     error = 0;
 285
 286         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
 287                                     mp);
 288         if (IS_ERR(*bdevp)) {
 289                 error = PTR_ERR(*bdevp);
 290                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
 291         }
 292
 293         return error;
 294 }
 295
 296 STATIC void
 297 xfs_blkdev_put(
 298         struct block_device     *bdev)
 299 {
 300         if (bdev)
 301                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 302 }
 303
 304 void
 305 xfs_blkdev_issue_flush(
 306         xfs_buftarg_t           *buftarg)
 307 {
 308         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
 309 }
 310
 311 STATIC void
 312 xfs_close_devices(
 313         struct xfs_mount        *mp)
 314 {
 315         struct dax_device *dax_ddev = mp->m_ddev_targp->bt_daxdev;
 316
 317         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 318                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
 319                 struct dax_device *dax_logdev = mp->m_logdev_targp->bt_daxdev;
 320
 321                 xfs_free_buftarg(mp->m_logdev_targp);
 322                 xfs_blkdev_put(logdev);
 323                 fs_put_dax(dax_logdev);
 324         }
 325         if (mp->m_rtdev_targp) {
 326                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
 327                 struct dax_device *dax_rtdev = mp->m_rtdev_targp->bt_daxdev;
 328
 329                 xfs_free_buftarg(mp->m_rtdev_targp);
 330                 xfs_blkdev_put(rtdev);
 331                 fs_put_dax(dax_rtdev);
 332         }
 333         xfs_free_buftarg(mp->m_ddev_targp);
 334         fs_put_dax(dax_ddev);
 335 }
 336
 337 /*
 338  * The file system configurations are:
 339  *      (1) device (partition) with data and internal log
 340  *      (2) logical volume with data and log subvolumes.
 341  *      (3) logical volume with data, log, and realtime subvolumes.
 342  *
 343  * We only have to handle opening the log and realtime volumes here if
 344  * they are present.  The data subvolume has already been opened by
 345  * get_sb_bdev() and is stored in sb->s_bdev.
 346  */
 347 STATIC int
 348 xfs_open_devices(
 349         struct xfs_mount        *mp)
 350 {
 351         struct block_device     *ddev = mp->m_super->s_bdev;
 352         struct dax_device       *dax_ddev = fs_dax_get_by_bdev(ddev);
 353         struct dax_device       *dax_logdev = NULL, *dax_rtdev = NULL;
 354         struct block_device     *logdev = NULL, *rtdev = NULL;
 355         int                     error;
 356
 357         /*
 358          * Open real time and log devices - order is important.
 359          */
 360         if (mp->m_logname) {
 361                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
 362                 if (error)
 363                         goto out;
 364                 dax_logdev = fs_dax_get_by_bdev(logdev);
 365         }
 366
 367         if (mp->m_rtname) {
 368                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
 369                 if (error)
 370                         goto out_close_logdev;
 371
 372                 if (rtdev == ddev || rtdev == logdev) {
 373                         xfs_warn(mp,
 374         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
 375                         error = -EINVAL;
 376                         goto out_close_rtdev;
 377                 }
 378                 dax_rtdev = fs_dax_get_by_bdev(rtdev);
 379         }
 380
 381         /*
 382          * Setup xfs_mount buffer target pointers
 383          */
 384         error = -ENOMEM;
 385         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, dax_ddev);
 386         if (!mp->m_ddev_targp)
 387                 goto out_close_rtdev;
 388
 389         if (rtdev) {
 390                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, dax_rtdev);
 391                 if (!mp->m_rtdev_targp)
 392                         goto out_free_ddev_targ;
 393         }
 394
 395         if (logdev && logdev != ddev) {
 396                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, dax_logdev);
 397                 if (!mp->m_logdev_targp)
 398                         goto out_free_rtdev_targ;
 399         } else {
 400                 mp->m_logdev_targp = mp->m_ddev_targp;
 401         }
 402
 403         return 0;
 404
 405  out_free_rtdev_targ:
 406         if (mp->m_rtdev_targp)
 407                 xfs_free_buftarg(mp->m_rtdev_targp);
 408  out_free_ddev_targ:
 409         xfs_free_buftarg(mp->m_ddev_targp);
 410  out_close_rtdev:
 411         xfs_blkdev_put(rtdev);
 412         fs_put_dax(dax_rtdev);
 413  out_close_logdev:
 414         if (logdev && logdev != ddev) {
 415                 xfs_blkdev_put(logdev);
 416                 fs_put_dax(dax_logdev);
 417         }
 418  out:
 419         fs_put_dax(dax_ddev);
 420         return error;
 421 }
 422
 423 /*
 424  * Setup xfs_mount buffer target pointers based on superblock
 425  */
 426 STATIC int
 427 xfs_setup_devices(
 428         struct xfs_mount        *mp)
 429 {
 430         int                     error;
 431
 432         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
 433         if (error)
 434                 return error;
 435
 436         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 437                 unsigned int    log_sector_size = BBSIZE;
 438
 439                 if (xfs_sb_version_hassector(&mp->m_sb))
 440                         log_sector_size = mp->m_sb.sb_logsectsize;
 441                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
 442                                             log_sector_size);
 443                 if (error)
 444                         return error;
 445         }
 446         if (mp->m_rtdev_targp) {
 447                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
 448                                             mp->m_sb.sb_sectsize);
 449                 if (error)
 450                         return error;
 451         }
 452
 453         return 0;
 454 }
 455
 456 STATIC int
 457 xfs_init_mount_workqueues(
 458         struct xfs_mount        *mp)
 459 {
 460         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
 461                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_super->s_id);
 462         if (!mp->m_buf_workqueue)
 463                 goto out;
 464
 465         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
 466                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_super->s_id);
 467         if (!mp->m_unwritten_workqueue)
 468                 goto out_destroy_buf;
 469
 470         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
 471                         WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND,
 472                         0, mp->m_super->s_id);
 473         if (!mp->m_cil_workqueue)
 474                 goto out_destroy_unwritten;
 475
 476         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
 477                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_super->s_id);
 478         if (!mp->m_reclaim_workqueue)
 479                 goto out_destroy_cil;
 480
 481         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
 482                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_super->s_id);
 483         if (!mp->m_eofblocks_workqueue)
 484                 goto out_destroy_reclaim;
 485
 486         mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s", WQ_FREEZABLE, 0,
 487                                                mp->m_super->s_id);
 488         if (!mp->m_sync_workqueue)
 489                 goto out_destroy_eofb;
 490
 491         return 0;
 492
 493 out_destroy_eofb:
 494         destroy_workqueue(mp->m_eofblocks_workqueue);
 495 out_destroy_reclaim:
 496         destroy_workqueue(mp->m_reclaim_workqueue);
 497 out_destroy_cil:
 498         destroy_workqueue(mp->m_cil_workqueue);
 499 out_destroy_unwritten:
 500         destroy_workqueue(mp->m_unwritten_workqueue);
 501 out_destroy_buf:
 502         destroy_workqueue(mp->m_buf_workqueue);
 503 out:
 504         return -ENOMEM;
 505 }
 506
 507 STATIC void
 508 xfs_destroy_mount_workqueues(
 509         struct xfs_mount        *mp)
 510 {
 511         destroy_workqueue(mp->m_sync_workqueue);
 512         destroy_workqueue(mp->m_eofblocks_workqueue);
 513         destroy_workqueue(mp->m_reclaim_workqueue);
 514         destroy_workqueue(mp->m_cil_workqueue);
 515         destroy_workqueue(mp->m_unwritten_workqueue);
 516         destroy_workqueue(mp->m_buf_workqueue);
 517 }
 518
 519 static void
 520 xfs_flush_inodes_worker(
 521         struct work_struct      *work)
 522 {
 523         struct xfs_mount        *mp = container_of(work, struct xfs_mount,
 524                                                    m_flush_inodes_work);
 525         struct super_block      *sb = mp->m_super;
 526
 527         if (down_read_trylock(&sb->s_umount)) {
 528                 sync_inodes_sb(sb);
 529                 up_read(&sb->s_umount);
 530         }
 531 }
 532
 533 /*
 534  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
 535  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
 536  * for IO to complete so that we effectively throttle multiple callers to the
 537  * rate at which IO is completing.
 538  */
 539 void
 540 xfs_flush_inodes(
 541         struct xfs_mount        *mp)
 542 {
 543         /*
 544          * If flush_work() returns true then that means we waited for a flush
 545          * which was already in progress.  Don't bother running another scan.
 546          */
 547         if (flush_work(&mp->m_flush_inodes_work))
 548                 return;
 549
 550         queue_work(mp->m_sync_workqueue, &mp->m_flush_inodes_work);
 551         flush_work(&mp->m_flush_inodes_work);
 552 }
 553
 554 /* Catch misguided souls that try to use this interface on XFS */
 555 STATIC struct inode *
 556 xfs_fs_alloc_inode(
 557         struct super_block      *sb)
 558 {
 559         BUG();
 560         return NULL;
 561 }
 562
 563 #ifdef DEBUG
 564 static void
 565 xfs_check_delalloc(
 566         struct xfs_inode        *ip,
 567         int                     whichfork)
 568 {
 569         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
 570         struct xfs_bmbt_irec    got;
 571         struct xfs_iext_cursor  icur;
 572
 573         if (!ifp || !xfs_iext_lookup_extent(ip, ifp, 0, &icur, &got))
 574                 return;
 575         do {
 576                 if (isnullstartblock(got.br_startblock)) {
 577                         xfs_warn(ip->i_mount,
 578         "ino %llx %s fork has delalloc extent at [0x%llx:0x%llx]",
 579                                 ip->i_ino,
 580                                 whichfork == XFS_DATA_FORK ? "data" : "cow",
 581                                 got.br_startoff, got.br_blockcount);
 582                 }
 583         } while (xfs_iext_next_extent(ifp, &icur, &got));
 584 }
 585 #else
 586 #define xfs_check_delalloc(ip, whichfork)       do { } while (0)
 587 #endif
 588
 589 /*
 590  * Now that the generic code is guaranteed not to be accessing
 591  * the linux inode, we can inactivate and reclaim the inode.
 592  */
 593 STATIC void
 594 xfs_fs_destroy_inode(
 595         struct inode            *inode)
 596 {
 597         struct xfs_inode        *ip = XFS_I(inode);
 598
 599         trace_xfs_destroy_inode(ip);
 600
 601         ASSERT(!rwsem_is_locked(&inode->i_rwsem));
 602         XFS_STATS_INC(ip->i_mount, vn_rele);
 603         XFS_STATS_INC(ip->i_mount, vn_remove);
 604
 605         xfs_inactive(ip);
 606
 607         if (!XFS_FORCED_SHUTDOWN(ip->i_mount) && ip->i_delayed_blks) {
 608                 xfs_check_delalloc(ip, XFS_DATA_FORK);
 609                 xfs_check_delalloc(ip, XFS_COW_FORK);
 610                 ASSERT(0);
 611         }
 612
 613         XFS_STATS_INC(ip->i_mount, vn_reclaim);
 614
 615         /*
 616          * We should never get here with one of the reclaim flags already set.
 617          */
 618         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
 619         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
 620
 621         /*
 622          * We always use background reclaim here because even if the
 623          * inode is clean, it still may be under IO and hence we have
 624          * to take the flush lock. The background reclaim path handles
 625          * this more efficiently than we can here, so simply let background
 626          * reclaim tear down all inodes.
 627          */
 628         xfs_inode_set_reclaim_tag(ip);
 629 }
 630
 631 static void
 632 xfs_fs_dirty_inode(
 633         struct inode                    *inode,
 634         int                             flag)
 635 {
 636         struct xfs_inode                *ip = XFS_I(inode);
 637         struct xfs_mount                *mp = ip->i_mount;
 638         struct xfs_trans                *tp;
 639
 640         if (!(inode->i_sb->s_flags & SB_LAZYTIME))
 641                 return;
 642         if (flag != I_DIRTY_SYNC || !(inode->i_state & I_DIRTY_TIME))
 643                 return;
 644
 645         if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
 646                 return;
 647         xfs_ilock(ip, XFS_ILOCK_EXCL);
 648         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 649         xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
 650         xfs_trans_commit(tp);
 651 }
 652
 653 /*
 654  * Slab object creation initialisation for the XFS inode.
 655  * This covers only the idempotent fields in the XFS inode;
 656  * all other fields need to be initialised on allocation
 657  * from the slab. This avoids the need to repeatedly initialise
 658  * fields in the xfs inode that left in the initialise state
 659  * when freeing the inode.
 660  */
 661 STATIC void
 662 xfs_fs_inode_init_once(
 663         void                    *inode)
 664 {
 665         struct xfs_inode        *ip = inode;
 666
 667         memset(ip, 0, sizeof(struct xfs_inode));
 668
 669         /* vfs inode */
 670         inode_init_once(VFS_I(ip));
 671
 672         /* xfs inode */
 673         atomic_set(&ip->i_pincount, 0);
 674         spin_lock_init(&ip->i_flags_lock);
 675
 676         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
 677                      "xfsino", ip->i_ino);
 678         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
 679                      "xfsino", ip->i_ino);
 680 }
 681
 682 /*
 683  * We do an unlocked check for XFS_IDONTCACHE here because we are already
 684  * serialised against cache hits here via the inode->i_lock and igrab() in
 685  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
 686  * racing with us, and it avoids needing to grab a spinlock here for every inode
 687  * we drop the final reference on.
 688  */
 689 STATIC int
 690 xfs_fs_drop_inode(
 691         struct inode            *inode)
 692 {
 693         struct xfs_inode        *ip = XFS_I(inode);
 694
 695         /*
 696          * If this unlinked inode is in the middle of recovery, don't
 697          * drop the inode just yet; log recovery will take care of
 698          * that.  See the comment for this inode flag.
 699          */
 700         if (ip->i_flags & XFS_IRECOVERY) {
 701                 ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED);
 702                 return 0;
 703         }
 704
 705         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
 706 }
 707
 708 static void
 709 xfs_mount_free(
 710         struct xfs_mount        *mp)
 711 {
 712         kfree(mp->m_rtname);
 713         kfree(mp->m_logname);
 714         kmem_free(mp);
 715 }
 716
 717 STATIC int
 718 xfs_fs_sync_fs(
 719         struct super_block      *sb,
 720         int                     wait)
 721 {
 722         struct xfs_mount        *mp = XFS_M(sb);
 723
 724         /*
 725          * Doing anything during the async pass would be counterproductive.
 726          */
 727         if (!wait)
 728                 return 0;
 729
 730         xfs_log_force(mp, XFS_LOG_SYNC);
 731         if (laptop_mode) {
 732                 /*
 733                  * The disk must be active because we're syncing.
 734                  * We schedule log work now (now that the disk is
 735                  * active) instead of later (when it might not be).
 736                  */
 737                 flush_delayed_work(&mp->m_log->l_work);
 738         }
 739
 740         return 0;
 741 }
 742
 743 STATIC int
 744 xfs_fs_statfs(
 745         struct dentry           *dentry,
 746         struct kstatfs          *statp)
 747 {
 748         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
 749         xfs_sb_t                *sbp = &mp->m_sb;
 750         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
 751         uint64_t                fakeinos, id;
 752         uint64_t                icount;
 753         uint64_t                ifree;
 754         uint64_t                fdblocks;
 755         xfs_extlen_t            lsize;
 756         int64_t                 ffree;
 757
 758         statp->f_type = XFS_SUPER_MAGIC;
 759         statp->f_namelen = MAXNAMELEN - 1;
 760
 761         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
 762         statp->f_fsid.val[0] = (u32)id;
 763         statp->f_fsid.val[1] = (u32)(id >> 32);
 764
 765         icount = percpu_counter_sum(&mp->m_icount);
 766         ifree = percpu_counter_sum(&mp->m_ifree);
 767         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
 768
 769         spin_lock(&mp->m_sb_lock);
 770         statp->f_bsize = sbp->sb_blocksize;
 771         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
 772         statp->f_blocks = sbp->sb_dblocks - lsize;
 773         spin_unlock(&mp->m_sb_lock);
 774
 775         statp->f_bfree = fdblocks - mp->m_alloc_set_aside;
 776         statp->f_bavail = statp->f_bfree;
 777
 778         fakeinos = XFS_FSB_TO_INO(mp, statp->f_bfree);
 779         statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
 780         if (M_IGEO(mp)->maxicount)
 781                 statp->f_files = min_t(typeof(statp->f_files),
 782                                         statp->f_files,
 783                                         M_IGEO(mp)->maxicount);
 784
 785         /* If sb_icount overshot maxicount, report actual allocation */
 786         statp->f_files = max_t(typeof(statp->f_files),
 787                                         statp->f_files,
 788                                         sbp->sb_icount);
 789
 790         /* make sure statp->f_ffree does not underflow */
 791         ffree = statp->f_files - (icount - ifree);
 792         statp->f_ffree = max_t(int64_t, ffree, 0);
 793
 794
 795         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
 796             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
 797                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
 798                 xfs_qm_statvfs(ip, statp);
 799
 800         if (XFS_IS_REALTIME_MOUNT(mp) &&
 801             (ip->i_d.di_flags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
 802                 statp->f_blocks = sbp->sb_rblocks;
 803                 statp->f_bavail = statp->f_bfree =
 804                         sbp->sb_frextents * sbp->sb_rextsize;
 805         }
 806
 807         return 0;
 808 }
 809
 810 STATIC void
 811 xfs_save_resvblks(struct xfs_mount *mp)
 812 {
 813         uint64_t resblks = 0;
 814
 815         mp->m_resblks_save = mp->m_resblks;
 816         xfs_reserve_blocks(mp, &resblks, NULL);
 817 }
 818
 819 STATIC void
 820 xfs_restore_resvblks(struct xfs_mount *mp)
 821 {
 822         uint64_t resblks;
 823
 824         if (mp->m_resblks_save) {
 825                 resblks = mp->m_resblks_save;
 826                 mp->m_resblks_save = 0;
 827         } else
 828                 resblks = xfs_default_resblks(mp);
 829
 830         xfs_reserve_blocks(mp, &resblks, NULL);
 831 }
 832
 833 /*
 834  * Trigger writeback of all the dirty metadata in the file system.
 835  *
 836  * This ensures that the metadata is written to their location on disk rather
 837  * than just existing in transactions in the log. This means after a quiesce
 838  * there is no log replay required to write the inodes to disk - this is the
 839  * primary difference between a sync and a quiesce.
 840  *
 841  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
 842  * it is started again when appropriate.
 843  */
 844 void
 845 xfs_quiesce_attr(
 846         struct xfs_mount        *mp)
 847 {
 848         int     error = 0;
 849
 850         /* wait for all modifications to complete */
 851         while (atomic_read(&mp->m_active_trans) > 0)
 852                 delay(100);
 853
 854         /* force the log to unpin objects from the now complete transactions */
 855         xfs_log_force(mp, XFS_LOG_SYNC);
 856
 857         /* reclaim inodes to do any IO before the freeze completes */
 858         xfs_reclaim_inodes(mp, 0);
 859         xfs_reclaim_inodes(mp, SYNC_WAIT);
 860
 861         /* Push the superblock and write an unmount record */
 862         error = xfs_log_sbcount(mp);
 863         if (error)
 864                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
 865                                 "Frozen image may not be consistent.");
 866         /*
 867          * Just warn here till VFS can correctly support
 868          * read-only remount without racing.
 869          */
 870         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
 871
 872         xfs_log_quiesce(mp);
 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
 887         xfs_stop_block_reaping(mp);
 888         xfs_save_resvblks(mp);
 889         xfs_quiesce_attr(mp);
 890         return xfs_sync_sb(mp, true);
 891 }
 892
 893 STATIC int
 894 xfs_fs_unfreeze(
 895         struct super_block      *sb)
 896 {
 897         struct xfs_mount        *mp = XFS_M(sb);
 898
 899         xfs_restore_resvblks(mp);
 900         xfs_log_work_queue(mp);
 901         xfs_start_block_reaping(mp);
 902         return 0;
 903 }
 904
 905 /*
 906  * This function fills in xfs_mount_t fields based on mount args.
 907  * Note: the superblock _has_ now been read in.
 908  */
 909 STATIC int
 910 xfs_finish_flags(
 911         struct xfs_mount        *mp)
 912 {
 913         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
 914
 915         /* Fail a mount where the logbuf is smaller than the log stripe */
 916         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
 917                 if (mp->m_logbsize <= 0 &&
 918                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
 919                         mp->m_logbsize = mp->m_sb.sb_logsunit;
 920                 } else if (mp->m_logbsize > 0 &&
 921                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
 922                         xfs_warn(mp,
 923                 "logbuf size must be greater than or equal to log stripe size");
 924                         return -EINVAL;
 925                 }
 926         } else {
 927                 /* Fail a mount if the logbuf is larger than 32K */
 928                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
 929                         xfs_warn(mp,
 930                 "logbuf size for version 1 logs must be 16K or 32K");
 931                         return -EINVAL;
 932                 }
 933         }
 934
 935         /*
 936          * V5 filesystems always use attr2 format for attributes.
 937          */
 938         if (xfs_sb_version_hascrc(&mp->m_sb) &&
 939             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
 940                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
 941                              "attr2 is always enabled for V5 filesystems.");
 942                 return -EINVAL;
 943         }
 944
 945         /*
 946          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
 947          * told by noattr2 to turn it off
 948          */
 949         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
 950             !(mp->m_flags & XFS_MOUNT_NOATTR2))
 951                 mp->m_flags |= XFS_MOUNT_ATTR2;
 952
 953         /*
 954          * prohibit r/w mounts of read-only filesystems
 955          */
 956         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
 957                 xfs_warn(mp,
 958                         "cannot mount a read-only filesystem as read-write");
 959                 return -EROFS;
 960         }
 961
 962         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
 963             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
 964             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
 965                 xfs_warn(mp,
 966                   "Super block does not support project and group quota together");
 967                 return -EINVAL;
 968         }
 969
 970         return 0;
 971 }
 972
 973 static int
 974 xfs_init_percpu_counters(
 975         struct xfs_mount        *mp)
 976 {
 977         int             error;
 978
 979         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
 980         if (error)
 981                 return -ENOMEM;
 982
 983         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
 984         if (error)
 985                 goto free_icount;
 986
 987         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
 988         if (error)
 989                 goto free_ifree;
 990
 991         error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL);
 992         if (error)
 993                 goto free_fdblocks;
 994
 995         return 0;
 996
 997 free_fdblocks:
 998         percpu_counter_destroy(&mp->m_fdblocks);
 999 free_ifree:
1000         percpu_counter_destroy(&mp->m_ifree);
1001 free_icount:
1002         percpu_counter_destroy(&mp->m_icount);
1003         return -ENOMEM;
1004 }
1005
1006 void
1007 xfs_reinit_percpu_counters(
1008         struct xfs_mount        *mp)
1009 {
1010         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1011         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1012         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1013 }
1014
1015 static void
1016 xfs_destroy_percpu_counters(
1017         struct xfs_mount        *mp)
1018 {
1019         percpu_counter_destroy(&mp->m_icount);
1020         percpu_counter_destroy(&mp->m_ifree);
1021         percpu_counter_destroy(&mp->m_fdblocks);
1022         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
1023                percpu_counter_sum(&mp->m_delalloc_blks) == 0);
1024         percpu_counter_destroy(&mp->m_delalloc_blks);
1025 }
1026
1027 static void
1028 xfs_fs_put_super(
1029         struct super_block      *sb)
1030 {
1031         struct xfs_mount        *mp = XFS_M(sb);
1032
1033         /* if ->fill_super failed, we have no mount to tear down */
1034         if (!sb->s_fs_info)
1035                 return;
1036
1037         xfs_notice(mp, "Unmounting Filesystem");
1038         xfs_filestream_unmount(mp);
1039         xfs_unmountfs(mp);
1040
1041         xfs_freesb(mp);
1042         free_percpu(mp->m_stats.xs_stats);
1043         xfs_destroy_percpu_counters(mp);
1044         xfs_destroy_mount_workqueues(mp);
1045         xfs_close_devices(mp);
1046
1047         sb->s_fs_info = NULL;
1048         xfs_mount_free(mp);
1049 }
1050
1051 static long
1052 xfs_fs_nr_cached_objects(
1053         struct super_block      *sb,
1054         struct shrink_control   *sc)
1055 {
1056         /* Paranoia: catch incorrect calls during mount setup or teardown */
1057         if (WARN_ON_ONCE(!sb->s_fs_info))
1058                 return 0;
1059         return xfs_reclaim_inodes_count(XFS_M(sb));
1060 }
1061
1062 static long
1063 xfs_fs_free_cached_objects(
1064         struct super_block      *sb,
1065         struct shrink_control   *sc)
1066 {
1067         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1068 }
1069
1070 static const struct super_operations xfs_super_operations = {
1071         .alloc_inode            = xfs_fs_alloc_inode,
1072         .destroy_inode          = xfs_fs_destroy_inode,
1073         .dirty_inode            = xfs_fs_dirty_inode,
1074         .drop_inode             = xfs_fs_drop_inode,
1075         .put_super              = xfs_fs_put_super,
1076         .sync_fs                = xfs_fs_sync_fs,
1077         .freeze_fs              = xfs_fs_freeze,
1078         .unfreeze_fs            = xfs_fs_unfreeze,
1079         .statfs                 = xfs_fs_statfs,
1080         .show_options           = xfs_fs_show_options,
1081         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1082         .free_cached_objects    = xfs_fs_free_cached_objects,
1083 };
1084
1085 static int
1086 suffix_kstrtoint(
1087         const char      *s,
1088         unsigned int    base,
1089         int             *res)
1090 {
1091         int             last, shift_left_factor = 0, _res;
1092         char            *value;
1093         int             ret = 0;
1094
1095         value = kstrdup(s, GFP_KERNEL);
1096         if (!value)
1097                 return -ENOMEM;
1098
1099         last = strlen(value) - 1;
1100         if (value[last] == 'K' || value[last] == 'k') {
1101                 shift_left_factor = 10;
1102                 value[last] = '\0';
1103         }
1104         if (value[last] == 'M' || value[last] == 'm') {
1105                 shift_left_factor = 20;
1106                 value[last] = '\0';
1107         }
1108         if (value[last] == 'G' || value[last] == 'g') {
1109                 shift_left_factor = 30;
1110                 value[last] = '\0';
1111         }
1112
1113         if (kstrtoint(value, base, &_res))
1114                 ret = -EINVAL;
1115         kfree(value);
1116         *res = _res << shift_left_factor;
1117         return ret;
1118 }
1119
1120 /*
1121  * Set mount state from a mount option.
1122  *
1123  * NOTE: mp->m_super is NULL here!
1124  */
1125 static int
1126 xfs_fc_parse_param(
1127         struct fs_context       *fc,
1128         struct fs_parameter     *param)
1129 {
1130         struct xfs_mount        *mp = fc->s_fs_info;
1131         struct fs_parse_result  result;
1132         int                     size = 0;
1133         int                     opt;
1134
1135         opt = fs_parse(fc, xfs_fs_parameters, param, &result);
1136         if (opt < 0)
1137                 return opt;
1138
1139         switch (opt) {
1140         case Opt_logbufs:
1141                 mp->m_logbufs = result.uint_32;
1142                 return 0;
1143         case Opt_logbsize:
1144                 if (suffix_kstrtoint(param->string, 10, &mp->m_logbsize))
1145                         return -EINVAL;
1146                 return 0;
1147         case Opt_logdev:
1148                 kfree(mp->m_logname);
1149                 mp->m_logname = kstrdup(param->string, GFP_KERNEL);
1150                 if (!mp->m_logname)
1151                         return -ENOMEM;
1152                 return 0;
1153         case Opt_rtdev:
1154                 kfree(mp->m_rtname);
1155                 mp->m_rtname = kstrdup(param->string, GFP_KERNEL);
1156                 if (!mp->m_rtname)
1157                         return -ENOMEM;
1158                 return 0;
1159         case Opt_allocsize:
1160                 if (suffix_kstrtoint(param->string, 10, &size))
1161                         return -EINVAL;
1162                 mp->m_allocsize_log = ffs(size) - 1;
1163                 mp->m_flags |= XFS_MOUNT_ALLOCSIZE;
1164                 return 0;
1165         case Opt_grpid:
1166         case Opt_bsdgroups:
1167                 mp->m_flags |= XFS_MOUNT_GRPID;
1168                 return 0;
1169         case Opt_nogrpid:
1170         case Opt_sysvgroups:
1171                 mp->m_flags &= ~XFS_MOUNT_GRPID;
1172                 return 0;
1173         case Opt_wsync:
1174                 mp->m_flags |= XFS_MOUNT_WSYNC;
1175                 return 0;
1176         case Opt_norecovery:
1177                 mp->m_flags |= XFS_MOUNT_NORECOVERY;
1178                 return 0;
1179         case Opt_noalign:
1180                 mp->m_flags |= XFS_MOUNT_NOALIGN;
1181                 return 0;
1182         case Opt_swalloc:
1183                 mp->m_flags |= XFS_MOUNT_SWALLOC;
1184                 return 0;
1185         case Opt_sunit:
1186                 mp->m_dalign = result.uint_32;
1187                 return 0;
1188         case Opt_swidth:
1189                 mp->m_swidth = result.uint_32;
1190                 return 0;
1191         case Opt_inode32:
1192                 mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1193                 return 0;
1194         case Opt_inode64:
1195                 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1196                 return 0;
1197         case Opt_nouuid:
1198                 mp->m_flags |= XFS_MOUNT_NOUUID;
1199                 return 0;
1200         case Opt_ikeep:
1201                 mp->m_flags |= XFS_MOUNT_IKEEP;
1202                 return 0;
1203         case Opt_noikeep:
1204                 mp->m_flags &= ~XFS_MOUNT_IKEEP;
1205                 return 0;
1206         case Opt_largeio:
1207                 mp->m_flags |= XFS_MOUNT_LARGEIO;
1208                 return 0;
1209         case Opt_nolargeio:
1210                 mp->m_flags &= ~XFS_MOUNT_LARGEIO;
1211                 return 0;
1212         case Opt_attr2:
1213                 mp->m_flags |= XFS_MOUNT_ATTR2;
1214                 return 0;
1215         case Opt_noattr2:
1216                 mp->m_flags &= ~XFS_MOUNT_ATTR2;
1217                 mp->m_flags |= XFS_MOUNT_NOATTR2;
1218                 return 0;
1219         case Opt_filestreams:
1220                 mp->m_flags |= XFS_MOUNT_FILESTREAMS;
1221                 return 0;
1222         case Opt_noquota:
1223                 mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
1224                 mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
1225                 mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
1226                 return 0;
1227         case Opt_quota:
1228         case Opt_uquota:
1229         case Opt_usrquota:
1230                 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
1231                                  XFS_UQUOTA_ENFD);
1232                 return 0;
1233         case Opt_qnoenforce:
1234         case Opt_uqnoenforce:
1235                 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
1236                 mp->m_qflags &= ~XFS_UQUOTA_ENFD;
1237                 return 0;
1238         case Opt_pquota:
1239         case Opt_prjquota:
1240                 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
1241                                  XFS_PQUOTA_ENFD);
1242                 return 0;
1243         case Opt_pqnoenforce:
1244                 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
1245                 mp->m_qflags &= ~XFS_PQUOTA_ENFD;
1246                 return 0;
1247         case Opt_gquota:
1248         case Opt_grpquota:
1249                 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
1250                                  XFS_GQUOTA_ENFD);
1251                 return 0;
1252         case Opt_gqnoenforce:
1253                 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
1254                 mp->m_qflags &= ~XFS_GQUOTA_ENFD;
1255                 return 0;
1256         case Opt_discard:
1257                 mp->m_flags |= XFS_MOUNT_DISCARD;
1258                 return 0;
1259         case Opt_nodiscard:
1260                 mp->m_flags &= ~XFS_MOUNT_DISCARD;
1261                 return 0;
1262 #ifdef CONFIG_FS_DAX
1263         case Opt_dax:
1264                 mp->m_flags |= XFS_MOUNT_DAX;
1265                 return 0;
1266 #endif
1267         default:
1268                 xfs_warn(mp, "unknown mount option [%s].", param->key);
1269                 return -EINVAL;
1270         }
1271
1272         return 0;
1273 }
1274
1275 static int
1276 xfs_fc_validate_params(
1277         struct xfs_mount        *mp)
1278 {
1279         /*
1280          * no recovery flag requires a read-only mount
1281          */
1282         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
1283             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
1284                 xfs_warn(mp, "no-recovery mounts must be read-only.");
1285                 return -EINVAL;
1286         }
1287
1288         if ((mp->m_flags & XFS_MOUNT_NOALIGN) &&
1289             (mp->m_dalign || mp->m_swidth)) {
1290                 xfs_warn(mp,
1291         "sunit and swidth options incompatible with the noalign option");
1292                 return -EINVAL;
1293         }
1294
1295         if (!IS_ENABLED(CONFIG_XFS_QUOTA) && mp->m_qflags != 0) {
1296                 xfs_warn(mp, "quota support not available in this kernel.");
1297                 return -EINVAL;
1298         }
1299
1300         if ((mp->m_dalign && !mp->m_swidth) ||
1301             (!mp->m_dalign && mp->m_swidth)) {
1302                 xfs_warn(mp, "sunit and swidth must be specified together");
1303                 return -EINVAL;
1304         }
1305
1306         if (mp->m_dalign && (mp->m_swidth % mp->m_dalign != 0)) {
1307                 xfs_warn(mp,
1308         "stripe width (%d) must be a multiple of the stripe unit (%d)",
1309                         mp->m_swidth, mp->m_dalign);
1310                 return -EINVAL;
1311         }
1312
1313         if (mp->m_logbufs != -1 &&
1314             mp->m_logbufs != 0 &&
1315             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
1316              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
1317                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
1318                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
1319                 return -EINVAL;
1320         }
1321
1322         if (mp->m_logbsize != -1 &&
1323             mp->m_logbsize !=  0 &&
1324             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
1325              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
1326              !is_power_of_2(mp->m_logbsize))) {
1327                 xfs_warn(mp,
1328                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
1329                         mp->m_logbsize);
1330                 return -EINVAL;
1331         }
1332
1333         if ((mp->m_flags & XFS_MOUNT_ALLOCSIZE) &&
1334             (mp->m_allocsize_log > XFS_MAX_IO_LOG ||
1335              mp->m_allocsize_log < XFS_MIN_IO_LOG)) {
1336                 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
1337                         mp->m_allocsize_log, XFS_MIN_IO_LOG, XFS_MAX_IO_LOG);
1338                 return -EINVAL;
1339         }
1340
1341         return 0;
1342 }
1343
1344 static int
1345 xfs_fc_fill_super(
1346         struct super_block      *sb,
1347         struct fs_context       *fc)
1348 {
1349         struct xfs_mount        *mp = sb->s_fs_info;
1350         struct inode            *root;
1351         int                     flags = 0, error;
1352
1353         mp->m_super = sb;
1354
1355         error = xfs_fc_validate_params(mp);
1356         if (error)
1357                 goto out_free_names;
1358
1359         sb_min_blocksize(sb, BBSIZE);
1360         sb->s_xattr = xfs_xattr_handlers;
1361         sb->s_export_op = &xfs_export_operations;
1362 #ifdef CONFIG_XFS_QUOTA
1363         sb->s_qcop = &xfs_quotactl_operations;
1364         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1365 #endif
1366         sb->s_op = &xfs_super_operations;
1367
1368         /*
1369          * Delay mount work if the debug hook is set. This is debug
1370          * instrumention to coordinate simulation of xfs mount failures with
1371          * VFS superblock operations
1372          */
1373         if (xfs_globals.mount_delay) {
1374                 xfs_notice(mp, "Delaying mount for %d seconds.",
1375                         xfs_globals.mount_delay);
1376                 msleep(xfs_globals.mount_delay * 1000);
1377         }
1378
1379         if (fc->sb_flags & SB_SILENT)
1380                 flags |= XFS_MFSI_QUIET;
1381
1382         error = xfs_open_devices(mp);
1383         if (error)
1384                 goto out_free_names;
1385
1386         error = xfs_init_mount_workqueues(mp);
1387         if (error)
1388                 goto out_close_devices;
1389
1390         error = xfs_init_percpu_counters(mp);
1391         if (error)
1392                 goto out_destroy_workqueues;
1393
1394         /* Allocate stats memory before we do operations that might use it */
1395         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1396         if (!mp->m_stats.xs_stats) {
1397                 error = -ENOMEM;
1398                 goto out_destroy_counters;
1399         }
1400
1401         error = xfs_readsb(mp, flags);
1402         if (error)
1403                 goto out_free_stats;
1404
1405         error = xfs_finish_flags(mp);
1406         if (error)
1407                 goto out_free_sb;
1408
1409         error = xfs_setup_devices(mp);
1410         if (error)
1411                 goto out_free_sb;
1412
1413         /*
1414          * XFS block mappings use 54 bits to store the logical block offset.
1415          * This should suffice to handle the maximum file size that the VFS
1416          * supports (currently 2^63 bytes on 64-bit and ULONG_MAX << PAGE_SHIFT
1417          * bytes on 32-bit), but as XFS and VFS have gotten the s_maxbytes
1418          * calculation wrong on 32-bit kernels in the past, we'll add a WARN_ON
1419          * to check this assertion.
1420          *
1421          * Avoid integer overflow by comparing the maximum bmbt offset to the
1422          * maximum pagecache offset in units of fs blocks.
1423          */
1424         if (XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE) > XFS_MAX_FILEOFF) {
1425                 xfs_warn(mp,
1426 "MAX_LFS_FILESIZE block offset (%llu) exceeds extent map maximum (%llu)!",
1427                          XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE),
1428                          XFS_MAX_FILEOFF);
1429                 error = -EINVAL;
1430                 goto out_free_sb;
1431         }
1432
1433         error = xfs_filestream_mount(mp);
1434         if (error)
1435                 goto out_free_sb;
1436
1437         /*
1438          * we must configure the block size in the superblock before we run the
1439          * full mount process as the mount process can lookup and cache inodes.
1440          */
1441         sb->s_magic = XFS_SUPER_MAGIC;
1442         sb->s_blocksize = mp->m_sb.sb_blocksize;
1443         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1444         sb->s_maxbytes = MAX_LFS_FILESIZE;
1445         sb->s_max_links = XFS_MAXLINK;
1446         sb->s_time_gran = 1;
1447         sb->s_time_min = S32_MIN;
1448         sb->s_time_max = S32_MAX;
1449         sb->s_iflags |= SB_I_CGROUPWB;
1450
1451         set_posix_acl_flag(sb);
1452
1453         /* version 5 superblocks support inode version counters. */
1454         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1455                 sb->s_flags |= SB_I_VERSION;
1456
1457         if (mp->m_flags & XFS_MOUNT_DAX) {
1458                 bool rtdev_is_dax = false, datadev_is_dax;
1459
1460                 xfs_warn(mp,
1461                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1462
1463                 datadev_is_dax = bdev_dax_supported(mp->m_ddev_targp->bt_bdev,
1464                         sb->s_blocksize);
1465                 if (mp->m_rtdev_targp)
1466                         rtdev_is_dax = bdev_dax_supported(
1467                                 mp->m_rtdev_targp->bt_bdev, sb->s_blocksize);
1468                 if (!rtdev_is_dax && !datadev_is_dax) {
1469                         xfs_alert(mp,
1470                         "DAX unsupported by block device. Turning off DAX.");
1471                         mp->m_flags &= ~XFS_MOUNT_DAX;
1472                 }
1473                 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1474                         xfs_alert(mp,
1475                 "DAX and reflink cannot be used together!");
1476                         error = -EINVAL;
1477                         goto out_filestream_unmount;
1478                 }
1479         }
1480
1481         if (mp->m_flags & XFS_MOUNT_DISCARD) {
1482                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1483
1484                 if (!blk_queue_discard(q)) {
1485                         xfs_warn(mp, "mounting with \"discard\" option, but "
1486                                         "the device does not support discard");
1487                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
1488                 }
1489         }
1490
1491         if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1492                 if (mp->m_sb.sb_rblocks) {
1493                         xfs_alert(mp,
1494         "reflink not compatible with realtime device!");
1495                         error = -EINVAL;
1496                         goto out_filestream_unmount;
1497                 }
1498
1499                 if (xfs_globals.always_cow) {
1500                         xfs_info(mp, "using DEBUG-only always_cow mode.");
1501                         mp->m_always_cow = true;
1502                 }
1503         }
1504
1505         if (xfs_sb_version_hasrmapbt(&mp->m_sb) && mp->m_sb.sb_rblocks) {
1506                 xfs_alert(mp,
1507         "reverse mapping btree not compatible with realtime device!");
1508                 error = -EINVAL;
1509                 goto out_filestream_unmount;
1510         }
1511
1512         error = xfs_mountfs(mp);
1513         if (error)
1514                 goto out_filestream_unmount;
1515
1516         root = igrab(VFS_I(mp->m_rootip));
1517         if (!root) {
1518                 error = -ENOENT;
1519                 goto out_unmount;
1520         }
1521         sb->s_root = d_make_root(root);
1522         if (!sb->s_root) {
1523                 error = -ENOMEM;
1524                 goto out_unmount;
1525         }
1526
1527         return 0;
1528
1529  out_filestream_unmount:
1530         xfs_filestream_unmount(mp);
1531  out_free_sb:
1532         xfs_freesb(mp);
1533  out_free_stats:
1534         free_percpu(mp->m_stats.xs_stats);
1535  out_destroy_counters:
1536         xfs_destroy_percpu_counters(mp);
1537  out_destroy_workqueues:
1538         xfs_destroy_mount_workqueues(mp);
1539  out_close_devices:
1540         xfs_close_devices(mp);
1541  out_free_names:
1542         sb->s_fs_info = NULL;
1543         xfs_mount_free(mp);
1544         return error;
1545
1546  out_unmount:
1547         xfs_filestream_unmount(mp);
1548         xfs_unmountfs(mp);
1549         goto out_free_sb;
1550 }
1551
1552 static int
1553 xfs_fc_get_tree(
1554         struct fs_context       *fc)
1555 {
1556         return get_tree_bdev(fc, xfs_fc_fill_super);
1557 }
1558
1559 static int
1560 xfs_remount_rw(
1561         struct xfs_mount        *mp)
1562 {
1563         struct xfs_sb           *sbp = &mp->m_sb;
1564         int error;
1565
1566         if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1567                 xfs_warn(mp,
1568                         "ro->rw transition prohibited on norecovery mount");
1569                 return -EINVAL;
1570         }
1571
1572         if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1573             xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1574                 xfs_warn(mp,
1575         "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1576                         (sbp->sb_features_ro_compat &
1577                                 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1578                 return -EINVAL;
1579         }
1580
1581         mp->m_flags &= ~XFS_MOUNT_RDONLY;
1582
1583         /*
1584          * If this is the first remount to writeable state we might have some
1585          * superblock changes to update.
1586          */
1587         if (mp->m_update_sb) {
1588                 error = xfs_sync_sb(mp, false);
1589                 if (error) {
1590                         xfs_warn(mp, "failed to write sb changes");
1591                         return error;
1592                 }
1593                 mp->m_update_sb = false;
1594         }
1595
1596         /*
1597          * Fill out the reserve pool if it is empty. Use the stashed value if
1598          * it is non-zero, otherwise go with the default.
1599          */
1600         xfs_restore_resvblks(mp);
1601         xfs_log_work_queue(mp);
1602
1603         /* Recover any CoW blocks that never got remapped. */
1604         error = xfs_reflink_recover_cow(mp);
1605         if (error) {
1606                 xfs_err(mp,
1607                         "Error %d recovering leftover CoW allocations.", error);
1608                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1609                 return error;
1610         }
1611         xfs_start_block_reaping(mp);
1612
1613         /* Create the per-AG metadata reservation pool .*/
1614         error = xfs_fs_reserve_ag_blocks(mp);
1615         if (error && error != -ENOSPC)
1616                 return error;
1617
1618         return 0;
1619 }
1620
1621 static int
1622 xfs_remount_ro(
1623         struct xfs_mount        *mp)
1624 {
1625         int error;
1626
1627         /*
1628          * Cancel background eofb scanning so it cannot race with the final
1629          * log force+buftarg wait and deadlock the remount.
1630          */
1631         xfs_stop_block_reaping(mp);
1632
1633         /* Get rid of any leftover CoW reservations... */
1634         error = xfs_icache_free_cowblocks(mp, NULL);
1635         if (error) {
1636                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1637                 return error;
1638         }
1639
1640         /* Free the per-AG metadata reservation pool. */
1641         error = xfs_fs_unreserve_ag_blocks(mp);
1642         if (error) {
1643                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1644                 return error;
1645         }
1646
1647         /*
1648          * Before we sync the metadata, we need to free up the reserve block
1649          * pool so that the used block count in the superblock on disk is
1650          * correct at the end of the remount. Stash the current* reserve pool
1651          * size so that if we get remounted rw, we can return it to the same
1652          * size.
1653          */
1654         xfs_save_resvblks(mp);
1655
1656         xfs_quiesce_attr(mp);
1657         mp->m_flags |= XFS_MOUNT_RDONLY;
1658
1659         return 0;
1660 }
1661
1662 /*
1663  * Logically we would return an error here to prevent users from believing
1664  * they might have changed mount options using remount which can't be changed.
1665  *
1666  * But unfortunately mount(8) adds all options from mtab and fstab to the mount
1667  * arguments in some cases so we can't blindly reject options, but have to
1668  * check for each specified option if it actually differs from the currently
1669  * set option and only reject it if that's the case.
1670  *
1671  * Until that is implemented we return success for every remount request, and
1672  * silently ignore all options that we can't actually change.
1673  */
1674 static int
1675 xfs_fc_reconfigure(
1676         struct fs_context *fc)
1677 {
1678         struct xfs_mount        *mp = XFS_M(fc->root->d_sb);
1679         struct xfs_mount        *new_mp = fc->s_fs_info;
1680         xfs_sb_t                *sbp = &mp->m_sb;
1681         int                     flags = fc->sb_flags;
1682         int                     error;
1683
1684         error = xfs_fc_validate_params(new_mp);
1685         if (error)
1686                 return error;
1687
1688         sync_filesystem(mp->m_super);
1689
1690         /* inode32 -> inode64 */
1691         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) &&
1692             !(new_mp->m_flags & XFS_MOUNT_SMALL_INUMS)) {
1693                 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1694                 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1695         }
1696
1697         /* inode64 -> inode32 */
1698         if (!(mp->m_flags & XFS_MOUNT_SMALL_INUMS) &&
1699             (new_mp->m_flags & XFS_MOUNT_SMALL_INUMS)) {
1700                 mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1701                 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1702         }
1703
1704         /* ro -> rw */
1705         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(flags & SB_RDONLY)) {
1706                 error = xfs_remount_rw(mp);
1707                 if (error)
1708                         return error;
1709         }
1710
1711         /* rw -> ro */
1712         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (flags & SB_RDONLY)) {
1713                 error = xfs_remount_ro(mp);
1714                 if (error)
1715                         return error;
1716         }
1717
1718         return 0;
1719 }
1720
1721 static void xfs_fc_free(
1722         struct fs_context       *fc)
1723 {
1724         struct xfs_mount        *mp = fc->s_fs_info;
1725
1726         /*
1727          * mp is stored in the fs_context when it is initialized.
1728          * mp is transferred to the superblock on a successful mount,
1729          * but if an error occurs before the transfer we have to free
1730          * it here.
1731          */
1732         if (mp)
1733                 xfs_mount_free(mp);
1734 }
1735
1736 static const struct fs_context_operations xfs_context_ops = {
1737         .parse_param = xfs_fc_parse_param,
1738         .get_tree    = xfs_fc_get_tree,
1739         .reconfigure = xfs_fc_reconfigure,
1740         .free        = xfs_fc_free,
1741 };
1742
1743 static int xfs_init_fs_context(
1744         struct fs_context       *fc)
1745 {
1746         struct xfs_mount        *mp;
1747
1748         mp = kmem_alloc(sizeof(struct xfs_mount), KM_ZERO);
1749         if (!mp)
1750                 return -ENOMEM;
1751
1752         spin_lock_init(&mp->m_sb_lock);
1753         spin_lock_init(&mp->m_agirotor_lock);
1754         INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
1755         spin_lock_init(&mp->m_perag_lock);
1756         mutex_init(&mp->m_growlock);
1757         atomic_set(&mp->m_active_trans, 0);
1758         INIT_WORK(&mp->m_flush_inodes_work, xfs_flush_inodes_worker);
1759         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1760         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1761         INIT_DELAYED_WORK(&mp->m_cowblocks_work, xfs_cowblocks_worker);
1762         mp->m_kobj.kobject.kset = xfs_kset;
1763         /*
1764          * We don't create the finobt per-ag space reservation until after log
1765          * recovery, so we must set this to true so that an ifree transaction
1766          * started during log recovery will not depend on space reservations
1767          * for finobt expansion.
1768          */
1769         mp->m_finobt_nores = true;
1770
1771         /*
1772          * These can be overridden by the mount option parsing.
1773          */
1774         mp->m_logbufs = -1;
1775         mp->m_logbsize = -1;
1776         mp->m_allocsize_log = 16; /* 64k */
1777
1778         /*
1779          * Copy binary VFS mount flags we are interested in.
1780          */
1781         if (fc->sb_flags & SB_RDONLY)
1782                 mp->m_flags |= XFS_MOUNT_RDONLY;
1783         if (fc->sb_flags & SB_DIRSYNC)
1784                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
1785         if (fc->sb_flags & SB_SYNCHRONOUS)
1786                 mp->m_flags |= XFS_MOUNT_WSYNC;
1787
1788         fc->s_fs_info = mp;
1789         fc->ops = &xfs_context_ops;
1790
1791         return 0;
1792 }
1793
1794 static struct file_system_type xfs_fs_type = {
1795         .owner                  = THIS_MODULE,
1796         .name                   = "xfs",
1797         .init_fs_context        = xfs_init_fs_context,
1798         .parameters             = xfs_fs_parameters,
1799         .kill_sb                = kill_block_super,
1800         .fs_flags               = FS_REQUIRES_DEV,
1801 };
1802 MODULE_ALIAS_FS("xfs");
1803
1804 STATIC int __init
1805 xfs_init_zones(void)
1806 {
1807         xfs_log_ticket_zone = kmem_cache_create("xfs_log_ticket",
1808                                                 sizeof(struct xlog_ticket),
1809                                                 0, 0, NULL);
1810         if (!xfs_log_ticket_zone)
1811                 goto out;
1812
1813         xfs_bmap_free_item_zone = kmem_cache_create("xfs_bmap_free_item",
1814                                         sizeof(struct xfs_extent_free_item),
1815                                         0, 0, NULL);
1816         if (!xfs_bmap_free_item_zone)
1817                 goto out_destroy_log_ticket_zone;
1818
1819         xfs_btree_cur_zone = kmem_cache_create("xfs_btree_cur",
1820                                                sizeof(struct xfs_btree_cur),
1821                                                0, 0, NULL);
1822         if (!xfs_btree_cur_zone)
1823                 goto out_destroy_bmap_free_item_zone;
1824
1825         xfs_da_state_zone = kmem_cache_create("xfs_da_state",
1826                                               sizeof(struct xfs_da_state),
1827                                               0, 0, NULL);
1828         if (!xfs_da_state_zone)
1829                 goto out_destroy_btree_cur_zone;
1830
1831         xfs_ifork_zone = kmem_cache_create("xfs_ifork",
1832                                            sizeof(struct xfs_ifork),
1833                                            0, 0, NULL);
1834         if (!xfs_ifork_zone)
1835                 goto out_destroy_da_state_zone;
1836
1837         xfs_trans_zone = kmem_cache_create("xf_trans",
1838                                            sizeof(struct xfs_trans),
1839                                            0, 0, NULL);
1840         if (!xfs_trans_zone)
1841                 goto out_destroy_ifork_zone;
1842
1843
1844         /*
1845          * The size of the zone allocated buf log item is the maximum
1846          * size possible under XFS.  This wastes a little bit of memory,
1847          * but it is much faster.
1848          */
1849         xfs_buf_item_zone = kmem_cache_create("xfs_buf_item",
1850                                               sizeof(struct xfs_buf_log_item),
1851                                               0, 0, NULL);
1852         if (!xfs_buf_item_zone)
1853                 goto out_destroy_trans_zone;
1854
1855         xfs_efd_zone = kmem_cache_create("xfs_efd_item",
1856                                         (sizeof(struct xfs_efd_log_item) +
1857                                         (XFS_EFD_MAX_FAST_EXTENTS - 1) *
1858                                         sizeof(struct xfs_extent)),
1859                                         0, 0, NULL);
1860         if (!xfs_efd_zone)
1861                 goto out_destroy_buf_item_zone;
1862
1863         xfs_efi_zone = kmem_cache_create("xfs_efi_item",
1864                                          (sizeof(struct xfs_efi_log_item) +
1865                                          (XFS_EFI_MAX_FAST_EXTENTS - 1) *
1866                                          sizeof(struct xfs_extent)),
1867                                          0, 0, NULL);
1868         if (!xfs_efi_zone)
1869                 goto out_destroy_efd_zone;
1870
1871         xfs_inode_zone = kmem_cache_create("xfs_inode",
1872                                            sizeof(struct xfs_inode), 0,
1873                                            (SLAB_HWCACHE_ALIGN |
1874                                             SLAB_RECLAIM_ACCOUNT |
1875                                             SLAB_MEM_SPREAD | SLAB_ACCOUNT),
1876                                            xfs_fs_inode_init_once);
1877         if (!xfs_inode_zone)
1878                 goto out_destroy_efi_zone;
1879
1880         xfs_ili_zone = kmem_cache_create("xfs_ili",
1881                                          sizeof(struct xfs_inode_log_item), 0,
1882                                          SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
1883                                          NULL);
1884         if (!xfs_ili_zone)
1885                 goto out_destroy_inode_zone;
1886
1887         xfs_icreate_zone = kmem_cache_create("xfs_icr",
1888                                              sizeof(struct xfs_icreate_item),
1889                                              0, 0, NULL);
1890         if (!xfs_icreate_zone)
1891                 goto out_destroy_ili_zone;
1892
1893         xfs_rud_zone = kmem_cache_create("xfs_rud_item",
1894                                          sizeof(struct xfs_rud_log_item),
1895                                          0, 0, NULL);
1896         if (!xfs_rud_zone)
1897                 goto out_destroy_icreate_zone;
1898
1899         xfs_rui_zone = kmem_cache_create("xfs_rui_item",
1900                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
1901                         0, 0, NULL);
1902         if (!xfs_rui_zone)
1903                 goto out_destroy_rud_zone;
1904
1905         xfs_cud_zone = kmem_cache_create("xfs_cud_item",
1906                                          sizeof(struct xfs_cud_log_item),
1907                                          0, 0, NULL);
1908         if (!xfs_cud_zone)
1909                 goto out_destroy_rui_zone;
1910
1911         xfs_cui_zone = kmem_cache_create("xfs_cui_item",
1912                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
1913                         0, 0, NULL);
1914         if (!xfs_cui_zone)
1915                 goto out_destroy_cud_zone;
1916
1917         xfs_bud_zone = kmem_cache_create("xfs_bud_item",
1918                                          sizeof(struct xfs_bud_log_item),
1919                                          0, 0, NULL);
1920         if (!xfs_bud_zone)
1921                 goto out_destroy_cui_zone;
1922
1923         xfs_bui_zone = kmem_cache_create("xfs_bui_item",
1924                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
1925                         0, 0, NULL);
1926         if (!xfs_bui_zone)
1927                 goto out_destroy_bud_zone;
1928
1929         return 0;
1930
1931  out_destroy_bud_zone:
1932         kmem_cache_destroy(xfs_bud_zone);
1933  out_destroy_cui_zone:
1934         kmem_cache_destroy(xfs_cui_zone);
1935  out_destroy_cud_zone:
1936         kmem_cache_destroy(xfs_cud_zone);
1937  out_destroy_rui_zone:
1938         kmem_cache_destroy(xfs_rui_zone);
1939  out_destroy_rud_zone:
1940         kmem_cache_destroy(xfs_rud_zone);
1941  out_destroy_icreate_zone:
1942         kmem_cache_destroy(xfs_icreate_zone);
1943  out_destroy_ili_zone:
1944         kmem_cache_destroy(xfs_ili_zone);
1945  out_destroy_inode_zone:
1946         kmem_cache_destroy(xfs_inode_zone);
1947  out_destroy_efi_zone:
1948         kmem_cache_destroy(xfs_efi_zone);
1949  out_destroy_efd_zone:
1950         kmem_cache_destroy(xfs_efd_zone);
1951  out_destroy_buf_item_zone:
1952         kmem_cache_destroy(xfs_buf_item_zone);
1953  out_destroy_trans_zone:
1954         kmem_cache_destroy(xfs_trans_zone);
1955  out_destroy_ifork_zone:
1956         kmem_cache_destroy(xfs_ifork_zone);
1957  out_destroy_da_state_zone:
1958         kmem_cache_destroy(xfs_da_state_zone);
1959  out_destroy_btree_cur_zone:
1960         kmem_cache_destroy(xfs_btree_cur_zone);
1961  out_destroy_bmap_free_item_zone:
1962         kmem_cache_destroy(xfs_bmap_free_item_zone);
1963  out_destroy_log_ticket_zone:
1964         kmem_cache_destroy(xfs_log_ticket_zone);
1965  out:
1966         return -ENOMEM;
1967 }
1968
1969 STATIC void
1970 xfs_destroy_zones(void)
1971 {
1972         /*
1973          * Make sure all delayed rcu free are flushed before we
1974          * destroy caches.
1975          */
1976         rcu_barrier();
1977         kmem_cache_destroy(xfs_bui_zone);
1978         kmem_cache_destroy(xfs_bud_zone);
1979         kmem_cache_destroy(xfs_cui_zone);
1980         kmem_cache_destroy(xfs_cud_zone);
1981         kmem_cache_destroy(xfs_rui_zone);
1982         kmem_cache_destroy(xfs_rud_zone);
1983         kmem_cache_destroy(xfs_icreate_zone);
1984         kmem_cache_destroy(xfs_ili_zone);
1985         kmem_cache_destroy(xfs_inode_zone);
1986         kmem_cache_destroy(xfs_efi_zone);
1987         kmem_cache_destroy(xfs_efd_zone);
1988         kmem_cache_destroy(xfs_buf_item_zone);
1989         kmem_cache_destroy(xfs_trans_zone);
1990         kmem_cache_destroy(xfs_ifork_zone);
1991         kmem_cache_destroy(xfs_da_state_zone);
1992         kmem_cache_destroy(xfs_btree_cur_zone);
1993         kmem_cache_destroy(xfs_bmap_free_item_zone);
1994         kmem_cache_destroy(xfs_log_ticket_zone);
1995 }
1996
1997 STATIC int __init
1998 xfs_init_workqueues(void)
1999 {
2000         /*
2001          * The allocation workqueue can be used in memory reclaim situations
2002          * (writepage path), and parallelism is only limited by the number of
2003          * AGs in all the filesystems mounted. Hence use the default large
2004          * max_active value for this workqueue.
2005          */
2006         xfs_alloc_wq = alloc_workqueue("xfsalloc",
2007                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
2008         if (!xfs_alloc_wq)
2009                 return -ENOMEM;
2010
2011         xfs_discard_wq = alloc_workqueue("xfsdiscard", WQ_UNBOUND, 0);
2012         if (!xfs_discard_wq)
2013                 goto out_free_alloc_wq;
2014
2015         return 0;
2016 out_free_alloc_wq:
2017         destroy_workqueue(xfs_alloc_wq);
2018         return -ENOMEM;
2019 }
2020
2021 STATIC void
2022 xfs_destroy_workqueues(void)
2023 {
2024         destroy_workqueue(xfs_discard_wq);
2025         destroy_workqueue(xfs_alloc_wq);
2026 }
2027
2028 STATIC int __init
2029 init_xfs_fs(void)
2030 {
2031         int                     error;
2032
2033         xfs_check_ondisk_structs();
2034
2035         printk(KERN_INFO XFS_VERSION_STRING " with "
2036                          XFS_BUILD_OPTIONS " enabled\n");
2037
2038         xfs_dir_startup();
2039
2040         error = xfs_init_zones();
2041         if (error)
2042                 goto out;
2043
2044         error = xfs_init_workqueues();
2045         if (error)
2046                 goto out_destroy_zones;
2047
2048         error = xfs_mru_cache_init();
2049         if (error)
2050                 goto out_destroy_wq;
2051
2052         error = xfs_buf_init();
2053         if (error)
2054                 goto out_mru_cache_uninit;
2055
2056         error = xfs_init_procfs();
2057         if (error)
2058                 goto out_buf_terminate;
2059
2060         error = xfs_sysctl_register();
2061         if (error)
2062                 goto out_cleanup_procfs;
2063
2064         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2065         if (!xfs_kset) {
2066                 error = -ENOMEM;
2067                 goto out_sysctl_unregister;
2068         }
2069
2070         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2071
2072         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2073         if (!xfsstats.xs_stats) {
2074                 error = -ENOMEM;
2075                 goto out_kset_unregister;
2076         }
2077
2078         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2079                                "stats");
2080         if (error)
2081                 goto out_free_stats;
2082
2083 #ifdef DEBUG
2084         xfs_dbg_kobj.kobject.kset = xfs_kset;
2085         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2086         if (error)
2087                 goto out_remove_stats_kobj;
2088 #endif
2089
2090         error = xfs_qm_init();
2091         if (error)
2092                 goto out_remove_dbg_kobj;
2093
2094         error = register_filesystem(&xfs_fs_type);
2095         if (error)
2096                 goto out_qm_exit;
2097         return 0;
2098
2099  out_qm_exit:
2100         xfs_qm_exit();
2101  out_remove_dbg_kobj:
2102 #ifdef DEBUG
2103         xfs_sysfs_del(&xfs_dbg_kobj);
2104  out_remove_stats_kobj:
2105 #endif
2106         xfs_sysfs_del(&xfsstats.xs_kobj);
2107  out_free_stats:
2108         free_percpu(xfsstats.xs_stats);
2109  out_kset_unregister:
2110         kset_unregister(xfs_kset);
2111  out_sysctl_unregister:
2112         xfs_sysctl_unregister();
2113  out_cleanup_procfs:
2114         xfs_cleanup_procfs();
2115  out_buf_terminate:
2116         xfs_buf_terminate();
2117  out_mru_cache_uninit:
2118         xfs_mru_cache_uninit();
2119  out_destroy_wq:
2120         xfs_destroy_workqueues();
2121  out_destroy_zones:
2122         xfs_destroy_zones();
2123  out:
2124         return error;
2125 }
2126
2127 STATIC void __exit
2128 exit_xfs_fs(void)
2129 {
2130         xfs_qm_exit();
2131         unregister_filesystem(&xfs_fs_type);
2132 #ifdef DEBUG
2133         xfs_sysfs_del(&xfs_dbg_kobj);
2134 #endif
2135         xfs_sysfs_del(&xfsstats.xs_kobj);
2136         free_percpu(xfsstats.xs_stats);
2137         kset_unregister(xfs_kset);
2138         xfs_sysctl_unregister();
2139         xfs_cleanup_procfs();
2140         xfs_buf_terminate();
2141         xfs_mru_cache_uninit();
2142         xfs_destroy_workqueues();
2143         xfs_destroy_zones();
2144         xfs_uuid_table_free();
2145 }
2146
2147 module_init(init_xfs_fs);
2148 module_exit(exit_xfs_fs);
2149
2150 MODULE_AUTHOR("Silicon Graphics, Inc.");
2151 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2152 MODULE_LICENSE("GPL");