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|XFS_UQUOTA_ENFD))
 203                 seq_puts(m, ",usrquota");
 204         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
 205                 seq_puts(m, ",uqnoenforce");
 206
 207         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
 208                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
 209                         seq_puts(m, ",prjquota");
 210                 else
 211                         seq_puts(m, ",pqnoenforce");
 212         }
 213         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
 214                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
 215                         seq_puts(m, ",grpquota");
 216                 else
 217                         seq_puts(m, ",gqnoenforce");
 218         }
 219
 220         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
 221                 seq_puts(m, ",noquota");
 222
 223         return 0;
 224 }
 225
 226 /*
 227  * Set parameters for inode allocation heuristics, taking into account
 228  * filesystem size and inode32/inode64 mount options; i.e. specifically
 229  * whether or not XFS_MOUNT_SMALL_INUMS is set.
 230  *
 231  * Inode allocation patterns are altered only if inode32 is requested
 232  * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
 233  * If altered, XFS_MOUNT_32BITINODES is set as well.
 234  *
 235  * An agcount independent of that in the mount structure is provided
 236  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
 237  * to the potentially higher ag count.
 238  *
 239  * Returns the maximum AG index which may contain inodes.
 240  */
 241 xfs_agnumber_t
 242 xfs_set_inode_alloc(
 243         struct xfs_mount *mp,
 244         xfs_agnumber_t  agcount)
 245 {
 246         xfs_agnumber_t  index;
 247         xfs_agnumber_t  maxagi = 0;
 248         xfs_sb_t        *sbp = &mp->m_sb;
 249         xfs_agnumber_t  max_metadata;
 250         xfs_agino_t     agino;
 251         xfs_ino_t       ino;
 252
 253         /*
 254          * Calculate how much should be reserved for inodes to meet
 255          * the max inode percentage.  Used only for inode32.
 256          */
 257         if (M_IGEO(mp)->maxicount) {
 258                 uint64_t        icount;
 259
 260                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
 261                 do_div(icount, 100);
 262                 icount += sbp->sb_agblocks - 1;
 263                 do_div(icount, sbp->sb_agblocks);
 264                 max_metadata = icount;
 265         } else {
 266                 max_metadata = agcount;
 267         }
 268
 269         /* Get the last possible inode in the filesystem */
 270         agino = XFS_AGB_TO_AGINO(mp, sbp->sb_agblocks - 1);
 271         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
 272
 273         /*
 274          * If user asked for no more than 32-bit inodes, and the fs is
 275          * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
 276          * the allocator to accommodate the request.
 277          */
 278         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
 279                 mp->m_flags |= XFS_MOUNT_32BITINODES;
 280         else
 281                 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
 282
 283         for (index = 0; index < agcount; index++) {
 284                 struct xfs_perag        *pag;
 285
 286                 ino = XFS_AGINO_TO_INO(mp, index, agino);
 287
 288                 pag = xfs_perag_get(mp, index);
 289
 290                 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
 291                         if (ino > XFS_MAXINUMBER_32) {
 292                                 pag->pagi_inodeok = 0;
 293                                 pag->pagf_metadata = 0;
 294                         } else {
 295                                 pag->pagi_inodeok = 1;
 296                                 maxagi++;
 297                                 if (index < max_metadata)
 298                                         pag->pagf_metadata = 1;
 299                                 else
 300                                         pag->pagf_metadata = 0;
 301                         }
 302                 } else {
 303                         pag->pagi_inodeok = 1;
 304                         pag->pagf_metadata = 0;
 305                 }
 306
 307                 xfs_perag_put(pag);
 308         }
 309
 310         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
 311 }
 312
 313 STATIC int
 314 xfs_blkdev_get(
 315         xfs_mount_t             *mp,
 316         const char              *name,
 317         struct block_device     **bdevp)
 318 {
 319         int                     error = 0;
 320
 321         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
 322                                     mp);
 323         if (IS_ERR(*bdevp)) {
 324                 error = PTR_ERR(*bdevp);
 325                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
 326         }
 327
 328         return error;
 329 }
 330
 331 STATIC void
 332 xfs_blkdev_put(
 333         struct block_device     *bdev)
 334 {
 335         if (bdev)
 336                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 337 }
 338
 339 void
 340 xfs_blkdev_issue_flush(
 341         xfs_buftarg_t           *buftarg)
 342 {
 343         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS);
 344 }
 345
 346 STATIC void
 347 xfs_close_devices(
 348         struct xfs_mount        *mp)
 349 {
 350         struct dax_device *dax_ddev = mp->m_ddev_targp->bt_daxdev;
 351
 352         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 353                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
 354                 struct dax_device *dax_logdev = mp->m_logdev_targp->bt_daxdev;
 355
 356                 xfs_free_buftarg(mp->m_logdev_targp);
 357                 xfs_blkdev_put(logdev);
 358                 fs_put_dax(dax_logdev);
 359         }
 360         if (mp->m_rtdev_targp) {
 361                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
 362                 struct dax_device *dax_rtdev = mp->m_rtdev_targp->bt_daxdev;
 363
 364                 xfs_free_buftarg(mp->m_rtdev_targp);
 365                 xfs_blkdev_put(rtdev);
 366                 fs_put_dax(dax_rtdev);
 367         }
 368         xfs_free_buftarg(mp->m_ddev_targp);
 369         fs_put_dax(dax_ddev);
 370 }
 371
 372 /*
 373  * The file system configurations are:
 374  *      (1) device (partition) with data and internal log
 375  *      (2) logical volume with data and log subvolumes.
 376  *      (3) logical volume with data, log, and realtime subvolumes.
 377  *
 378  * We only have to handle opening the log and realtime volumes here if
 379  * they are present.  The data subvolume has already been opened by
 380  * get_sb_bdev() and is stored in sb->s_bdev.
 381  */
 382 STATIC int
 383 xfs_open_devices(
 384         struct xfs_mount        *mp)
 385 {
 386         struct block_device     *ddev = mp->m_super->s_bdev;
 387         struct dax_device       *dax_ddev = fs_dax_get_by_bdev(ddev);
 388         struct dax_device       *dax_logdev = NULL, *dax_rtdev = NULL;
 389         struct block_device     *logdev = NULL, *rtdev = NULL;
 390         int                     error;
 391
 392         /*
 393          * Open real time and log devices - order is important.
 394          */
 395         if (mp->m_logname) {
 396                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
 397                 if (error)
 398                         goto out;
 399                 dax_logdev = fs_dax_get_by_bdev(logdev);
 400         }
 401
 402         if (mp->m_rtname) {
 403                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
 404                 if (error)
 405                         goto out_close_logdev;
 406
 407                 if (rtdev == ddev || rtdev == logdev) {
 408                         xfs_warn(mp,
 409         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
 410                         error = -EINVAL;
 411                         goto out_close_rtdev;
 412                 }
 413                 dax_rtdev = fs_dax_get_by_bdev(rtdev);
 414         }
 415
 416         /*
 417          * Setup xfs_mount buffer target pointers
 418          */
 419         error = -ENOMEM;
 420         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, dax_ddev);
 421         if (!mp->m_ddev_targp)
 422                 goto out_close_rtdev;
 423
 424         if (rtdev) {
 425                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, dax_rtdev);
 426                 if (!mp->m_rtdev_targp)
 427                         goto out_free_ddev_targ;
 428         }
 429
 430         if (logdev && logdev != ddev) {
 431                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, dax_logdev);
 432                 if (!mp->m_logdev_targp)
 433                         goto out_free_rtdev_targ;
 434         } else {
 435                 mp->m_logdev_targp = mp->m_ddev_targp;
 436         }
 437
 438         return 0;
 439
 440  out_free_rtdev_targ:
 441         if (mp->m_rtdev_targp)
 442                 xfs_free_buftarg(mp->m_rtdev_targp);
 443  out_free_ddev_targ:
 444         xfs_free_buftarg(mp->m_ddev_targp);
 445  out_close_rtdev:
 446         xfs_blkdev_put(rtdev);
 447         fs_put_dax(dax_rtdev);
 448  out_close_logdev:
 449         if (logdev && logdev != ddev) {
 450                 xfs_blkdev_put(logdev);
 451                 fs_put_dax(dax_logdev);
 452         }
 453  out:
 454         fs_put_dax(dax_ddev);
 455         return error;
 456 }
 457
 458 /*
 459  * Setup xfs_mount buffer target pointers based on superblock
 460  */
 461 STATIC int
 462 xfs_setup_devices(
 463         struct xfs_mount        *mp)
 464 {
 465         int                     error;
 466
 467         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
 468         if (error)
 469                 return error;
 470
 471         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 472                 unsigned int    log_sector_size = BBSIZE;
 473
 474                 if (xfs_sb_version_hassector(&mp->m_sb))
 475                         log_sector_size = mp->m_sb.sb_logsectsize;
 476                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
 477                                             log_sector_size);
 478                 if (error)
 479                         return error;
 480         }
 481         if (mp->m_rtdev_targp) {
 482                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
 483                                             mp->m_sb.sb_sectsize);
 484                 if (error)
 485                         return error;
 486         }
 487
 488         return 0;
 489 }
 490
 491 STATIC int
 492 xfs_init_mount_workqueues(
 493         struct xfs_mount        *mp)
 494 {
 495         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
 496                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_super->s_id);
 497         if (!mp->m_buf_workqueue)
 498                 goto out;
 499
 500         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
 501                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_super->s_id);
 502         if (!mp->m_unwritten_workqueue)
 503                 goto out_destroy_buf;
 504
 505         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
 506                         WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND,
 507                         0, mp->m_super->s_id);
 508         if (!mp->m_cil_workqueue)
 509                 goto out_destroy_unwritten;
 510
 511         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
 512                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_super->s_id);
 513         if (!mp->m_reclaim_workqueue)
 514                 goto out_destroy_cil;
 515
 516         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
 517                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_super->s_id);
 518         if (!mp->m_eofblocks_workqueue)
 519                 goto out_destroy_reclaim;
 520
 521         mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s", WQ_FREEZABLE, 0,
 522                                                mp->m_super->s_id);
 523         if (!mp->m_sync_workqueue)
 524                 goto out_destroy_eofb;
 525
 526         return 0;
 527
 528 out_destroy_eofb:
 529         destroy_workqueue(mp->m_eofblocks_workqueue);
 530 out_destroy_reclaim:
 531         destroy_workqueue(mp->m_reclaim_workqueue);
 532 out_destroy_cil:
 533         destroy_workqueue(mp->m_cil_workqueue);
 534 out_destroy_unwritten:
 535         destroy_workqueue(mp->m_unwritten_workqueue);
 536 out_destroy_buf:
 537         destroy_workqueue(mp->m_buf_workqueue);
 538 out:
 539         return -ENOMEM;
 540 }
 541
 542 STATIC void
 543 xfs_destroy_mount_workqueues(
 544         struct xfs_mount        *mp)
 545 {
 546         destroy_workqueue(mp->m_sync_workqueue);
 547         destroy_workqueue(mp->m_eofblocks_workqueue);
 548         destroy_workqueue(mp->m_reclaim_workqueue);
 549         destroy_workqueue(mp->m_cil_workqueue);
 550         destroy_workqueue(mp->m_unwritten_workqueue);
 551         destroy_workqueue(mp->m_buf_workqueue);
 552 }
 553
 554 static void
 555 xfs_flush_inodes_worker(
 556         struct work_struct      *work)
 557 {
 558         struct xfs_mount        *mp = container_of(work, struct xfs_mount,
 559                                                    m_flush_inodes_work);
 560         struct super_block      *sb = mp->m_super;
 561
 562         if (down_read_trylock(&sb->s_umount)) {
 563                 sync_inodes_sb(sb);
 564                 up_read(&sb->s_umount);
 565         }
 566 }
 567
 568 /*
 569  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
 570  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
 571  * for IO to complete so that we effectively throttle multiple callers to the
 572  * rate at which IO is completing.
 573  */
 574 void
 575 xfs_flush_inodes(
 576         struct xfs_mount        *mp)
 577 {
 578         /*
 579          * If flush_work() returns true then that means we waited for a flush
 580          * which was already in progress.  Don't bother running another scan.
 581          */
 582         if (flush_work(&mp->m_flush_inodes_work))
 583                 return;
 584
 585         queue_work(mp->m_sync_workqueue, &mp->m_flush_inodes_work);
 586         flush_work(&mp->m_flush_inodes_work);
 587 }
 588
 589 /* Catch misguided souls that try to use this interface on XFS */
 590 STATIC struct inode *
 591 xfs_fs_alloc_inode(
 592         struct super_block      *sb)
 593 {
 594         BUG();
 595         return NULL;
 596 }
 597
 598 #ifdef DEBUG
 599 static void
 600 xfs_check_delalloc(
 601         struct xfs_inode        *ip,
 602         int                     whichfork)
 603 {
 604         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
 605         struct xfs_bmbt_irec    got;
 606         struct xfs_iext_cursor  icur;
 607
 608         if (!ifp || !xfs_iext_lookup_extent(ip, ifp, 0, &icur, &got))
 609                 return;
 610         do {
 611                 if (isnullstartblock(got.br_startblock)) {
 612                         xfs_warn(ip->i_mount,
 613         "ino %llx %s fork has delalloc extent at [0x%llx:0x%llx]",
 614                                 ip->i_ino,
 615                                 whichfork == XFS_DATA_FORK ? "data" : "cow",
 616                                 got.br_startoff, got.br_blockcount);
 617                 }
 618         } while (xfs_iext_next_extent(ifp, &icur, &got));
 619 }
 620 #else
 621 #define xfs_check_delalloc(ip, whichfork)       do { } while (0)
 622 #endif
 623
 624 /*
 625  * Now that the generic code is guaranteed not to be accessing
 626  * the linux inode, we can inactivate and reclaim the inode.
 627  */
 628 STATIC void
 629 xfs_fs_destroy_inode(
 630         struct inode            *inode)
 631 {
 632         struct xfs_inode        *ip = XFS_I(inode);
 633
 634         trace_xfs_destroy_inode(ip);
 635
 636         ASSERT(!rwsem_is_locked(&inode->i_rwsem));
 637         XFS_STATS_INC(ip->i_mount, vn_rele);
 638         XFS_STATS_INC(ip->i_mount, vn_remove);
 639
 640         xfs_inactive(ip);
 641
 642         if (!XFS_FORCED_SHUTDOWN(ip->i_mount) && ip->i_delayed_blks) {
 643                 xfs_check_delalloc(ip, XFS_DATA_FORK);
 644                 xfs_check_delalloc(ip, XFS_COW_FORK);
 645                 ASSERT(0);
 646         }
 647
 648         XFS_STATS_INC(ip->i_mount, vn_reclaim);
 649
 650         /*
 651          * We should never get here with one of the reclaim flags already set.
 652          */
 653         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
 654         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
 655
 656         /*
 657          * We always use background reclaim here because even if the
 658          * inode is clean, it still may be under IO and hence we have
 659          * to take the flush lock. The background reclaim path handles
 660          * this more efficiently than we can here, so simply let background
 661          * reclaim tear down all inodes.
 662          */
 663         xfs_inode_set_reclaim_tag(ip);
 664 }
 665
 666 static void
 667 xfs_fs_dirty_inode(
 668         struct inode                    *inode,
 669         int                             flag)
 670 {
 671         struct xfs_inode                *ip = XFS_I(inode);
 672         struct xfs_mount                *mp = ip->i_mount;
 673         struct xfs_trans                *tp;
 674
 675         if (!(inode->i_sb->s_flags & SB_LAZYTIME))
 676                 return;
 677         if (flag != I_DIRTY_SYNC || !(inode->i_state & I_DIRTY_TIME))
 678                 return;
 679
 680         if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
 681                 return;
 682         xfs_ilock(ip, XFS_ILOCK_EXCL);
 683         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 684         xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
 685         xfs_trans_commit(tp);
 686 }
 687
 688 /*
 689  * Slab object creation initialisation for the XFS inode.
 690  * This covers only the idempotent fields in the XFS inode;
 691  * all other fields need to be initialised on allocation
 692  * from the slab. This avoids the need to repeatedly initialise
 693  * fields in the xfs inode that left in the initialise state
 694  * when freeing the inode.
 695  */
 696 STATIC void
 697 xfs_fs_inode_init_once(
 698         void                    *inode)
 699 {
 700         struct xfs_inode        *ip = inode;
 701
 702         memset(ip, 0, sizeof(struct xfs_inode));
 703
 704         /* vfs inode */
 705         inode_init_once(VFS_I(ip));
 706
 707         /* xfs inode */
 708         atomic_set(&ip->i_pincount, 0);
 709         spin_lock_init(&ip->i_flags_lock);
 710
 711         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
 712                      "xfsino", ip->i_ino);
 713         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
 714                      "xfsino", ip->i_ino);
 715 }
 716
 717 /*
 718  * We do an unlocked check for XFS_IDONTCACHE here because we are already
 719  * serialised against cache hits here via the inode->i_lock and igrab() in
 720  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
 721  * racing with us, and it avoids needing to grab a spinlock here for every inode
 722  * we drop the final reference on.
 723  */
 724 STATIC int
 725 xfs_fs_drop_inode(
 726         struct inode            *inode)
 727 {
 728         struct xfs_inode        *ip = XFS_I(inode);
 729
 730         /*
 731          * If this unlinked inode is in the middle of recovery, don't
 732          * drop the inode just yet; log recovery will take care of
 733          * that.  See the comment for this inode flag.
 734          */
 735         if (ip->i_flags & XFS_IRECOVERY) {
 736                 ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED);
 737                 return 0;
 738         }
 739
 740         return generic_drop_inode(inode);
 741 }
 742
 743 static void
 744 xfs_mount_free(
 745         struct xfs_mount        *mp)
 746 {
 747         kfree(mp->m_rtname);
 748         kfree(mp->m_logname);
 749         kmem_free(mp);
 750 }
 751
 752 STATIC int
 753 xfs_fs_sync_fs(
 754         struct super_block      *sb,
 755         int                     wait)
 756 {
 757         struct xfs_mount        *mp = XFS_M(sb);
 758
 759         /*
 760          * Doing anything during the async pass would be counterproductive.
 761          */
 762         if (!wait)
 763                 return 0;
 764
 765         xfs_log_force(mp, XFS_LOG_SYNC);
 766         if (laptop_mode) {
 767                 /*
 768                  * The disk must be active because we're syncing.
 769                  * We schedule log work now (now that the disk is
 770                  * active) instead of later (when it might not be).
 771                  */
 772                 flush_delayed_work(&mp->m_log->l_work);
 773         }
 774
 775         return 0;
 776 }
 777
 778 STATIC int
 779 xfs_fs_statfs(
 780         struct dentry           *dentry,
 781         struct kstatfs          *statp)
 782 {
 783         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
 784         xfs_sb_t                *sbp = &mp->m_sb;
 785         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
 786         uint64_t                fakeinos, id;
 787         uint64_t                icount;
 788         uint64_t                ifree;
 789         uint64_t                fdblocks;
 790         xfs_extlen_t            lsize;
 791         int64_t                 ffree;
 792
 793         statp->f_type = XFS_SUPER_MAGIC;
 794         statp->f_namelen = MAXNAMELEN - 1;
 795
 796         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
 797         statp->f_fsid.val[0] = (u32)id;
 798         statp->f_fsid.val[1] = (u32)(id >> 32);
 799
 800         icount = percpu_counter_sum(&mp->m_icount);
 801         ifree = percpu_counter_sum(&mp->m_ifree);
 802         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
 803
 804         spin_lock(&mp->m_sb_lock);
 805         statp->f_bsize = sbp->sb_blocksize;
 806         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
 807         statp->f_blocks = sbp->sb_dblocks - lsize;
 808         spin_unlock(&mp->m_sb_lock);
 809
 810         /* make sure statp->f_bfree does not underflow */
 811         statp->f_bfree = max_t(int64_t, fdblocks - mp->m_alloc_set_aside, 0);
 812         statp->f_bavail = statp->f_bfree;
 813
 814         fakeinos = XFS_FSB_TO_INO(mp, statp->f_bfree);
 815         statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
 816         if (M_IGEO(mp)->maxicount)
 817                 statp->f_files = min_t(typeof(statp->f_files),
 818                                         statp->f_files,
 819                                         M_IGEO(mp)->maxicount);
 820
 821         /* If sb_icount overshot maxicount, report actual allocation */
 822         statp->f_files = max_t(typeof(statp->f_files),
 823                                         statp->f_files,
 824                                         sbp->sb_icount);
 825
 826         /* make sure statp->f_ffree does not underflow */
 827         ffree = statp->f_files - (icount - ifree);
 828         statp->f_ffree = max_t(int64_t, ffree, 0);
 829
 830
 831         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
 832             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
 833                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
 834                 xfs_qm_statvfs(ip, statp);
 835
 836         if (XFS_IS_REALTIME_MOUNT(mp) &&
 837             (ip->i_d.di_flags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
 838                 statp->f_blocks = sbp->sb_rblocks;
 839                 statp->f_bavail = statp->f_bfree =
 840                         sbp->sb_frextents * sbp->sb_rextsize;
 841         }
 842
 843         return 0;
 844 }
 845
 846 STATIC void
 847 xfs_save_resvblks(struct xfs_mount *mp)
 848 {
 849         uint64_t resblks = 0;
 850
 851         mp->m_resblks_save = mp->m_resblks;
 852         xfs_reserve_blocks(mp, &resblks, NULL);
 853 }
 854
 855 STATIC void
 856 xfs_restore_resvblks(struct xfs_mount *mp)
 857 {
 858         uint64_t resblks;
 859
 860         if (mp->m_resblks_save) {
 861                 resblks = mp->m_resblks_save;
 862                 mp->m_resblks_save = 0;
 863         } else
 864                 resblks = xfs_default_resblks(mp);
 865
 866         xfs_reserve_blocks(mp, &resblks, NULL);
 867 }
 868
 869 /*
 870  * Trigger writeback of all the dirty metadata in the file system.
 871  *
 872  * This ensures that the metadata is written to their location on disk rather
 873  * than just existing in transactions in the log. This means after a quiesce
 874  * there is no log replay required to write the inodes to disk - this is the
 875  * primary difference between a sync and a quiesce.
 876  *
 877  * We cancel log work early here to ensure all transactions the log worker may
 878  * run have finished before we clean up and log the superblock and write an
 879  * unmount record. The unfreeze process is responsible for restarting the log
 880  * worker correctly.
 881  */
 882 void
 883 xfs_quiesce_attr(
 884         struct xfs_mount        *mp)
 885 {
 886         int     error = 0;
 887
 888         cancel_delayed_work_sync(&mp->m_log->l_work);
 889
 890         /* force the log to unpin objects from the now complete transactions */
 891         xfs_log_force(mp, XFS_LOG_SYNC);
 892
 893
 894         /* Push the superblock and write an unmount record */
 895         error = xfs_log_sbcount(mp);
 896         if (error)
 897                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
 898                                 "Frozen image may not be consistent.");
 899         xfs_log_quiesce(mp);
 900 }
 901
 902 /*
 903  * Second stage of a freeze. The data is already frozen so we only
 904  * need to take care of the metadata. Once that's done sync the superblock
 905  * to the log to dirty it in case of a crash while frozen. This ensures that we
 906  * will recover the unlinked inode lists on the next mount.
 907  */
 908 STATIC int
 909 xfs_fs_freeze(
 910         struct super_block      *sb)
 911 {
 912         struct xfs_mount        *mp = XFS_M(sb);
 913         unsigned int            flags;
 914         int                     ret;
 915
 916         /*
 917          * The filesystem is now frozen far enough that memory reclaim
 918          * cannot safely operate on the filesystem. Hence we need to
 919          * set a GFP_NOFS context here to avoid recursion deadlocks.
 920          */
 921         flags = memalloc_nofs_save();
 922         xfs_stop_block_reaping(mp);
 923         xfs_save_resvblks(mp);
 924         xfs_quiesce_attr(mp);
 925         ret = xfs_sync_sb(mp, true);
 926         memalloc_nofs_restore(flags);
 927         return ret;
 928 }
 929
 930 STATIC int
 931 xfs_fs_unfreeze(
 932         struct super_block      *sb)
 933 {
 934         struct xfs_mount        *mp = XFS_M(sb);
 935
 936         xfs_restore_resvblks(mp);
 937         xfs_log_work_queue(mp);
 938         xfs_start_block_reaping(mp);
 939         return 0;
 940 }
 941
 942 /*
 943  * This function fills in xfs_mount_t fields based on mount args.
 944  * Note: the superblock _has_ now been read in.
 945  */
 946 STATIC int
 947 xfs_finish_flags(
 948         struct xfs_mount        *mp)
 949 {
 950         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
 951
 952         /* Fail a mount where the logbuf is smaller than the log stripe */
 953         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
 954                 if (mp->m_logbsize <= 0 &&
 955                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
 956                         mp->m_logbsize = mp->m_sb.sb_logsunit;
 957                 } else if (mp->m_logbsize > 0 &&
 958                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
 959                         xfs_warn(mp,
 960                 "logbuf size must be greater than or equal to log stripe size");
 961                         return -EINVAL;
 962                 }
 963         } else {
 964                 /* Fail a mount if the logbuf is larger than 32K */
 965                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
 966                         xfs_warn(mp,
 967                 "logbuf size for version 1 logs must be 16K or 32K");
 968                         return -EINVAL;
 969                 }
 970         }
 971
 972         /*
 973          * V5 filesystems always use attr2 format for attributes.
 974          */
 975         if (xfs_sb_version_hascrc(&mp->m_sb) &&
 976             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
 977                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
 978                              "attr2 is always enabled for V5 filesystems.");
 979                 return -EINVAL;
 980         }
 981
 982         /*
 983          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
 984          * told by noattr2 to turn it off
 985          */
 986         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
 987             !(mp->m_flags & XFS_MOUNT_NOATTR2))
 988                 mp->m_flags |= XFS_MOUNT_ATTR2;
 989
 990         /*
 991          * prohibit r/w mounts of read-only filesystems
 992          */
 993         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
 994                 xfs_warn(mp,
 995                         "cannot mount a read-only filesystem as read-write");
 996                 return -EROFS;
 997         }
 998
 999         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1000             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1001             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1002                 xfs_warn(mp,
1003                   "Super block does not support project and group quota together");
1004                 return -EINVAL;
1005         }
1006
1007         return 0;
1008 }
1009
1010 static int
1011 xfs_init_percpu_counters(
1012         struct xfs_mount        *mp)
1013 {
1014         int             error;
1015
1016         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1017         if (error)
1018                 return -ENOMEM;
1019
1020         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1021         if (error)
1022                 goto free_icount;
1023
1024         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1025         if (error)
1026                 goto free_ifree;
1027
1028         error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL);
1029         if (error)
1030                 goto free_fdblocks;
1031
1032         return 0;
1033
1034 free_fdblocks:
1035         percpu_counter_destroy(&mp->m_fdblocks);
1036 free_ifree:
1037         percpu_counter_destroy(&mp->m_ifree);
1038 free_icount:
1039         percpu_counter_destroy(&mp->m_icount);
1040         return -ENOMEM;
1041 }
1042
1043 void
1044 xfs_reinit_percpu_counters(
1045         struct xfs_mount        *mp)
1046 {
1047         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1048         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1049         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1050 }
1051
1052 static void
1053 xfs_destroy_percpu_counters(
1054         struct xfs_mount        *mp)
1055 {
1056         percpu_counter_destroy(&mp->m_icount);
1057         percpu_counter_destroy(&mp->m_ifree);
1058         percpu_counter_destroy(&mp->m_fdblocks);
1059         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
1060                percpu_counter_sum(&mp->m_delalloc_blks) == 0);
1061         percpu_counter_destroy(&mp->m_delalloc_blks);
1062 }
1063
1064 static void
1065 xfs_fs_put_super(
1066         struct super_block      *sb)
1067 {
1068         struct xfs_mount        *mp = XFS_M(sb);
1069
1070         /* if ->fill_super failed, we have no mount to tear down */
1071         if (!sb->s_fs_info)
1072                 return;
1073
1074         xfs_notice(mp, "Unmounting Filesystem");
1075         xfs_filestream_unmount(mp);
1076         xfs_unmountfs(mp);
1077
1078         xfs_freesb(mp);
1079         free_percpu(mp->m_stats.xs_stats);
1080         xfs_destroy_percpu_counters(mp);
1081         xfs_destroy_mount_workqueues(mp);
1082         xfs_close_devices(mp);
1083
1084         sb->s_fs_info = NULL;
1085         xfs_mount_free(mp);
1086 }
1087
1088 static long
1089 xfs_fs_nr_cached_objects(
1090         struct super_block      *sb,
1091         struct shrink_control   *sc)
1092 {
1093         /* Paranoia: catch incorrect calls during mount setup or teardown */
1094         if (WARN_ON_ONCE(!sb->s_fs_info))
1095                 return 0;
1096         return xfs_reclaim_inodes_count(XFS_M(sb));
1097 }
1098
1099 static long
1100 xfs_fs_free_cached_objects(
1101         struct super_block      *sb,
1102         struct shrink_control   *sc)
1103 {
1104         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1105 }
1106
1107 static const struct super_operations xfs_super_operations = {
1108         .alloc_inode            = xfs_fs_alloc_inode,
1109         .destroy_inode          = xfs_fs_destroy_inode,
1110         .dirty_inode            = xfs_fs_dirty_inode,
1111         .drop_inode             = xfs_fs_drop_inode,
1112         .put_super              = xfs_fs_put_super,
1113         .sync_fs                = xfs_fs_sync_fs,
1114         .freeze_fs              = xfs_fs_freeze,
1115         .unfreeze_fs            = xfs_fs_unfreeze,
1116         .statfs                 = xfs_fs_statfs,
1117         .show_options           = xfs_fs_show_options,
1118         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1119         .free_cached_objects    = xfs_fs_free_cached_objects,
1120 };
1121
1122 static int
1123 suffix_kstrtoint(
1124         const char      *s,
1125         unsigned int    base,
1126         int             *res)
1127 {
1128         int             last, shift_left_factor = 0, _res;
1129         char            *value;
1130         int             ret = 0;
1131
1132         value = kstrdup(s, GFP_KERNEL);
1133         if (!value)
1134                 return -ENOMEM;
1135
1136         last = strlen(value) - 1;
1137         if (value[last] == 'K' || value[last] == 'k') {
1138                 shift_left_factor = 10;
1139                 value[last] = '\0';
1140         }
1141         if (value[last] == 'M' || value[last] == 'm') {
1142                 shift_left_factor = 20;
1143                 value[last] = '\0';
1144         }
1145         if (value[last] == 'G' || value[last] == 'g') {
1146                 shift_left_factor = 30;
1147                 value[last] = '\0';
1148         }
1149
1150         if (kstrtoint(value, base, &_res))
1151                 ret = -EINVAL;
1152         kfree(value);
1153         *res = _res << shift_left_factor;
1154         return ret;
1155 }
1156
1157 /*
1158  * Set mount state from a mount option.
1159  *
1160  * NOTE: mp->m_super is NULL here!
1161  */
1162 static int
1163 xfs_fc_parse_param(
1164         struct fs_context       *fc,
1165         struct fs_parameter     *param)
1166 {
1167         struct xfs_mount        *mp = fc->s_fs_info;
1168         struct fs_parse_result  result;
1169         int                     size = 0;
1170         int                     opt;
1171
1172         opt = fs_parse(fc, xfs_fs_parameters, param, &result);
1173         if (opt < 0)
1174                 return opt;
1175
1176         switch (opt) {
1177         case Opt_logbufs:
1178                 mp->m_logbufs = result.uint_32;
1179                 return 0;
1180         case Opt_logbsize:
1181                 if (suffix_kstrtoint(param->string, 10, &mp->m_logbsize))
1182                         return -EINVAL;
1183                 return 0;
1184         case Opt_logdev:
1185                 kfree(mp->m_logname);
1186                 mp->m_logname = kstrdup(param->string, GFP_KERNEL);
1187                 if (!mp->m_logname)
1188                         return -ENOMEM;
1189                 return 0;
1190         case Opt_rtdev:
1191                 kfree(mp->m_rtname);
1192                 mp->m_rtname = kstrdup(param->string, GFP_KERNEL);
1193                 if (!mp->m_rtname)
1194                         return -ENOMEM;
1195                 return 0;
1196         case Opt_allocsize:
1197                 if (suffix_kstrtoint(param->string, 10, &size))
1198                         return -EINVAL;
1199                 mp->m_allocsize_log = ffs(size) - 1;
1200                 mp->m_flags |= XFS_MOUNT_ALLOCSIZE;
1201                 return 0;
1202         case Opt_grpid:
1203         case Opt_bsdgroups:
1204                 mp->m_flags |= XFS_MOUNT_GRPID;
1205                 return 0;
1206         case Opt_nogrpid:
1207         case Opt_sysvgroups:
1208                 mp->m_flags &= ~XFS_MOUNT_GRPID;
1209                 return 0;
1210         case Opt_wsync:
1211                 mp->m_flags |= XFS_MOUNT_WSYNC;
1212                 return 0;
1213         case Opt_norecovery:
1214                 mp->m_flags |= XFS_MOUNT_NORECOVERY;
1215                 return 0;
1216         case Opt_noalign:
1217                 mp->m_flags |= XFS_MOUNT_NOALIGN;
1218                 return 0;
1219         case Opt_swalloc:
1220                 mp->m_flags |= XFS_MOUNT_SWALLOC;
1221                 return 0;
1222         case Opt_sunit:
1223                 mp->m_dalign = result.uint_32;
1224                 return 0;
1225         case Opt_swidth:
1226                 mp->m_swidth = result.uint_32;
1227                 return 0;
1228         case Opt_inode32:
1229                 mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1230                 return 0;
1231         case Opt_inode64:
1232                 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1233                 return 0;
1234         case Opt_nouuid:
1235                 mp->m_flags |= XFS_MOUNT_NOUUID;
1236                 return 0;
1237         case Opt_ikeep:
1238                 mp->m_flags |= XFS_MOUNT_IKEEP;
1239                 return 0;
1240         case Opt_noikeep:
1241                 mp->m_flags &= ~XFS_MOUNT_IKEEP;
1242                 return 0;
1243         case Opt_largeio:
1244                 mp->m_flags |= XFS_MOUNT_LARGEIO;
1245                 return 0;
1246         case Opt_nolargeio:
1247                 mp->m_flags &= ~XFS_MOUNT_LARGEIO;
1248                 return 0;
1249         case Opt_attr2:
1250                 mp->m_flags |= XFS_MOUNT_ATTR2;
1251                 return 0;
1252         case Opt_noattr2:
1253                 mp->m_flags &= ~XFS_MOUNT_ATTR2;
1254                 mp->m_flags |= XFS_MOUNT_NOATTR2;
1255                 return 0;
1256         case Opt_filestreams:
1257                 mp->m_flags |= XFS_MOUNT_FILESTREAMS;
1258                 return 0;
1259         case Opt_noquota:
1260                 mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
1261                 mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
1262                 mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
1263                 return 0;
1264         case Opt_quota:
1265         case Opt_uquota:
1266         case Opt_usrquota:
1267                 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
1268                                  XFS_UQUOTA_ENFD);
1269                 return 0;
1270         case Opt_qnoenforce:
1271         case Opt_uqnoenforce:
1272                 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
1273                 mp->m_qflags &= ~XFS_UQUOTA_ENFD;
1274                 return 0;
1275         case Opt_pquota:
1276         case Opt_prjquota:
1277                 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
1278                                  XFS_PQUOTA_ENFD);
1279                 return 0;
1280         case Opt_pqnoenforce:
1281                 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
1282                 mp->m_qflags &= ~XFS_PQUOTA_ENFD;
1283                 return 0;
1284         case Opt_gquota:
1285         case Opt_grpquota:
1286                 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
1287                                  XFS_GQUOTA_ENFD);
1288                 return 0;
1289         case Opt_gqnoenforce:
1290                 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
1291                 mp->m_qflags &= ~XFS_GQUOTA_ENFD;
1292                 return 0;
1293         case Opt_discard:
1294                 mp->m_flags |= XFS_MOUNT_DISCARD;
1295                 return 0;
1296         case Opt_nodiscard:
1297                 mp->m_flags &= ~XFS_MOUNT_DISCARD;
1298                 return 0;
1299 #ifdef CONFIG_FS_DAX
1300         case Opt_dax:
1301                 xfs_mount_set_dax_mode(mp, XFS_DAX_ALWAYS);
1302                 return 0;
1303         case Opt_dax_enum:
1304                 xfs_mount_set_dax_mode(mp, result.uint_32);
1305                 return 0;
1306 #endif
1307         default:
1308                 xfs_warn(mp, "unknown mount option [%s].", param->key);
1309                 return -EINVAL;
1310         }
1311
1312         return 0;
1313 }
1314
1315 static int
1316 xfs_fc_validate_params(
1317         struct xfs_mount        *mp)
1318 {
1319         /*
1320          * no recovery flag requires a read-only mount
1321          */
1322         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
1323             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
1324                 xfs_warn(mp, "no-recovery mounts must be read-only.");
1325                 return -EINVAL;
1326         }
1327
1328         if ((mp->m_flags & XFS_MOUNT_NOALIGN) &&
1329             (mp->m_dalign || mp->m_swidth)) {
1330                 xfs_warn(mp,
1331         "sunit and swidth options incompatible with the noalign option");
1332                 return -EINVAL;
1333         }
1334
1335         if (!IS_ENABLED(CONFIG_XFS_QUOTA) && mp->m_qflags != 0) {
1336                 xfs_warn(mp, "quota support not available in this kernel.");
1337                 return -EINVAL;
1338         }
1339
1340         if ((mp->m_dalign && !mp->m_swidth) ||
1341             (!mp->m_dalign && mp->m_swidth)) {
1342                 xfs_warn(mp, "sunit and swidth must be specified together");
1343                 return -EINVAL;
1344         }
1345
1346         if (mp->m_dalign && (mp->m_swidth % mp->m_dalign != 0)) {
1347                 xfs_warn(mp,
1348         "stripe width (%d) must be a multiple of the stripe unit (%d)",
1349                         mp->m_swidth, mp->m_dalign);
1350                 return -EINVAL;
1351         }
1352
1353         if (mp->m_logbufs != -1 &&
1354             mp->m_logbufs != 0 &&
1355             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
1356              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
1357                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
1358                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
1359                 return -EINVAL;
1360         }
1361
1362         if (mp->m_logbsize != -1 &&
1363             mp->m_logbsize !=  0 &&
1364             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
1365              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
1366              !is_power_of_2(mp->m_logbsize))) {
1367                 xfs_warn(mp,
1368                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
1369                         mp->m_logbsize);
1370                 return -EINVAL;
1371         }
1372
1373         if ((mp->m_flags & XFS_MOUNT_ALLOCSIZE) &&
1374             (mp->m_allocsize_log > XFS_MAX_IO_LOG ||
1375              mp->m_allocsize_log < XFS_MIN_IO_LOG)) {
1376                 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
1377                         mp->m_allocsize_log, XFS_MIN_IO_LOG, XFS_MAX_IO_LOG);
1378                 return -EINVAL;
1379         }
1380
1381         return 0;
1382 }
1383
1384 static int
1385 xfs_fc_fill_super(
1386         struct super_block      *sb,
1387         struct fs_context       *fc)
1388 {
1389         struct xfs_mount        *mp = sb->s_fs_info;
1390         struct inode            *root;
1391         int                     flags = 0, error;
1392
1393         mp->m_super = sb;
1394
1395         error = xfs_fc_validate_params(mp);
1396         if (error)
1397                 goto out_free_names;
1398
1399         sb_min_blocksize(sb, BBSIZE);
1400         sb->s_xattr = xfs_xattr_handlers;
1401         sb->s_export_op = &xfs_export_operations;
1402 #ifdef CONFIG_XFS_QUOTA
1403         sb->s_qcop = &xfs_quotactl_operations;
1404         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1405 #endif
1406         sb->s_op = &xfs_super_operations;
1407
1408         /*
1409          * Delay mount work if the debug hook is set. This is debug
1410          * instrumention to coordinate simulation of xfs mount failures with
1411          * VFS superblock operations
1412          */
1413         if (xfs_globals.mount_delay) {
1414                 xfs_notice(mp, "Delaying mount for %d seconds.",
1415                         xfs_globals.mount_delay);
1416                 msleep(xfs_globals.mount_delay * 1000);
1417         }
1418
1419         if (fc->sb_flags & SB_SILENT)
1420                 flags |= XFS_MFSI_QUIET;
1421
1422         error = xfs_open_devices(mp);
1423         if (error)
1424                 goto out_free_names;
1425
1426         error = xfs_init_mount_workqueues(mp);
1427         if (error)
1428                 goto out_close_devices;
1429
1430         error = xfs_init_percpu_counters(mp);
1431         if (error)
1432                 goto out_destroy_workqueues;
1433
1434         /* Allocate stats memory before we do operations that might use it */
1435         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1436         if (!mp->m_stats.xs_stats) {
1437                 error = -ENOMEM;
1438                 goto out_destroy_counters;
1439         }
1440
1441         error = xfs_readsb(mp, flags);
1442         if (error)
1443                 goto out_free_stats;
1444
1445         error = xfs_finish_flags(mp);
1446         if (error)
1447                 goto out_free_sb;
1448
1449         error = xfs_setup_devices(mp);
1450         if (error)
1451                 goto out_free_sb;
1452
1453         /*
1454          * XFS block mappings use 54 bits to store the logical block offset.
1455          * This should suffice to handle the maximum file size that the VFS
1456          * supports (currently 2^63 bytes on 64-bit and ULONG_MAX << PAGE_SHIFT
1457          * bytes on 32-bit), but as XFS and VFS have gotten the s_maxbytes
1458          * calculation wrong on 32-bit kernels in the past, we'll add a WARN_ON
1459          * to check this assertion.
1460          *
1461          * Avoid integer overflow by comparing the maximum bmbt offset to the
1462          * maximum pagecache offset in units of fs blocks.
1463          */
1464         if (XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE) > XFS_MAX_FILEOFF) {
1465                 xfs_warn(mp,
1466 "MAX_LFS_FILESIZE block offset (%llu) exceeds extent map maximum (%llu)!",
1467                          XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE),
1468                          XFS_MAX_FILEOFF);
1469                 error = -EINVAL;
1470                 goto out_free_sb;
1471         }
1472
1473         error = xfs_filestream_mount(mp);
1474         if (error)
1475                 goto out_free_sb;
1476
1477         /*
1478          * we must configure the block size in the superblock before we run the
1479          * full mount process as the mount process can lookup and cache inodes.
1480          */
1481         sb->s_magic = XFS_SUPER_MAGIC;
1482         sb->s_blocksize = mp->m_sb.sb_blocksize;
1483         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1484         sb->s_maxbytes = MAX_LFS_FILESIZE;
1485         sb->s_max_links = XFS_MAXLINK;
1486         sb->s_time_gran = 1;
1487         sb->s_time_min = S32_MIN;
1488         sb->s_time_max = S32_MAX;
1489         sb->s_iflags |= SB_I_CGROUPWB;
1490
1491         set_posix_acl_flag(sb);
1492
1493         /* version 5 superblocks support inode version counters. */
1494         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1495                 sb->s_flags |= SB_I_VERSION;
1496
1497         if (mp->m_flags & XFS_MOUNT_DAX_ALWAYS) {
1498                 bool rtdev_is_dax = false, datadev_is_dax;
1499
1500                 xfs_warn(mp,
1501                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1502
1503                 datadev_is_dax = bdev_dax_supported(mp->m_ddev_targp->bt_bdev,
1504                         sb->s_blocksize);
1505                 if (mp->m_rtdev_targp)
1506                         rtdev_is_dax = bdev_dax_supported(
1507                                 mp->m_rtdev_targp->bt_bdev, sb->s_blocksize);
1508                 if (!rtdev_is_dax && !datadev_is_dax) {
1509                         xfs_alert(mp,
1510                         "DAX unsupported by block device. Turning off DAX.");
1511                         xfs_mount_set_dax_mode(mp, XFS_DAX_NEVER);
1512                 }
1513                 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1514                         xfs_alert(mp,
1515                 "DAX and reflink cannot be used together!");
1516                         error = -EINVAL;
1517                         goto out_filestream_unmount;
1518                 }
1519         }
1520
1521         if (mp->m_flags & XFS_MOUNT_DISCARD) {
1522                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1523
1524                 if (!blk_queue_discard(q)) {
1525                         xfs_warn(mp, "mounting with \"discard\" option, but "
1526                                         "the device does not support discard");
1527                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
1528                 }
1529         }
1530
1531         if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1532                 if (mp->m_sb.sb_rblocks) {
1533                         xfs_alert(mp,
1534         "reflink not compatible with realtime device!");
1535                         error = -EINVAL;
1536                         goto out_filestream_unmount;
1537                 }
1538
1539                 if (xfs_globals.always_cow) {
1540                         xfs_info(mp, "using DEBUG-only always_cow mode.");
1541                         mp->m_always_cow = true;
1542                 }
1543         }
1544
1545         if (xfs_sb_version_hasrmapbt(&mp->m_sb) && mp->m_sb.sb_rblocks) {
1546                 xfs_alert(mp,
1547         "reverse mapping btree not compatible with realtime device!");
1548                 error = -EINVAL;
1549                 goto out_filestream_unmount;
1550         }
1551
1552         error = xfs_mountfs(mp);
1553         if (error)
1554                 goto out_filestream_unmount;
1555
1556         root = igrab(VFS_I(mp->m_rootip));
1557         if (!root) {
1558                 error = -ENOENT;
1559                 goto out_unmount;
1560         }
1561         sb->s_root = d_make_root(root);
1562         if (!sb->s_root) {
1563                 error = -ENOMEM;
1564                 goto out_unmount;
1565         }
1566
1567         return 0;
1568
1569  out_filestream_unmount:
1570         xfs_filestream_unmount(mp);
1571  out_free_sb:
1572         xfs_freesb(mp);
1573  out_free_stats:
1574         free_percpu(mp->m_stats.xs_stats);
1575  out_destroy_counters:
1576         xfs_destroy_percpu_counters(mp);
1577  out_destroy_workqueues:
1578         xfs_destroy_mount_workqueues(mp);
1579  out_close_devices:
1580         xfs_close_devices(mp);
1581  out_free_names:
1582         sb->s_fs_info = NULL;
1583         xfs_mount_free(mp);
1584         return error;
1585
1586  out_unmount:
1587         xfs_filestream_unmount(mp);
1588         xfs_unmountfs(mp);
1589         goto out_free_sb;
1590 }
1591
1592 static int
1593 xfs_fc_get_tree(
1594         struct fs_context       *fc)
1595 {
1596         return get_tree_bdev(fc, xfs_fc_fill_super);
1597 }
1598
1599 static int
1600 xfs_remount_rw(
1601         struct xfs_mount        *mp)
1602 {
1603         struct xfs_sb           *sbp = &mp->m_sb;
1604         int error;
1605
1606         if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1607                 xfs_warn(mp,
1608                         "ro->rw transition prohibited on norecovery mount");
1609                 return -EINVAL;
1610         }
1611
1612         if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1613             xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1614                 xfs_warn(mp,
1615         "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1616                         (sbp->sb_features_ro_compat &
1617                                 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1618                 return -EINVAL;
1619         }
1620
1621         mp->m_flags &= ~XFS_MOUNT_RDONLY;
1622
1623         /*
1624          * If this is the first remount to writeable state we might have some
1625          * superblock changes to update.
1626          */
1627         if (mp->m_update_sb) {
1628                 error = xfs_sync_sb(mp, false);
1629                 if (error) {
1630                         xfs_warn(mp, "failed to write sb changes");
1631                         return error;
1632                 }
1633                 mp->m_update_sb = false;
1634         }
1635
1636         /*
1637          * Fill out the reserve pool if it is empty. Use the stashed value if
1638          * it is non-zero, otherwise go with the default.
1639          */
1640         xfs_restore_resvblks(mp);
1641         xfs_log_work_queue(mp);
1642
1643         /* Recover any CoW blocks that never got remapped. */
1644         error = xfs_reflink_recover_cow(mp);
1645         if (error) {
1646                 xfs_err(mp,
1647                         "Error %d recovering leftover CoW allocations.", error);
1648                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1649                 return error;
1650         }
1651         xfs_start_block_reaping(mp);
1652
1653         /* Create the per-AG metadata reservation pool .*/
1654         error = xfs_fs_reserve_ag_blocks(mp);
1655         if (error && error != -ENOSPC)
1656                 return error;
1657
1658         return 0;
1659 }
1660
1661 static int
1662 xfs_remount_ro(
1663         struct xfs_mount        *mp)
1664 {
1665         int error;
1666
1667         /*
1668          * Cancel background eofb scanning so it cannot race with the final
1669          * log force+buftarg wait and deadlock the remount.
1670          */
1671         xfs_stop_block_reaping(mp);
1672
1673         /* Get rid of any leftover CoW reservations... */
1674         error = xfs_icache_free_cowblocks(mp, NULL);
1675         if (error) {
1676                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1677                 return error;
1678         }
1679
1680         /* Free the per-AG metadata reservation pool. */
1681         error = xfs_fs_unreserve_ag_blocks(mp);
1682         if (error) {
1683                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1684                 return error;
1685         }
1686
1687         /*
1688          * Before we sync the metadata, we need to free up the reserve block
1689          * pool so that the used block count in the superblock on disk is
1690          * correct at the end of the remount. Stash the current* reserve pool
1691          * size so that if we get remounted rw, we can return it to the same
1692          * size.
1693          */
1694         xfs_save_resvblks(mp);
1695
1696         xfs_quiesce_attr(mp);
1697         mp->m_flags |= XFS_MOUNT_RDONLY;
1698
1699         return 0;
1700 }
1701
1702 /*
1703  * Logically we would return an error here to prevent users from believing
1704  * they might have changed mount options using remount which can't be changed.
1705  *
1706  * But unfortunately mount(8) adds all options from mtab and fstab to the mount
1707  * arguments in some cases so we can't blindly reject options, but have to
1708  * check for each specified option if it actually differs from the currently
1709  * set option and only reject it if that's the case.
1710  *
1711  * Until that is implemented we return success for every remount request, and
1712  * silently ignore all options that we can't actually change.
1713  */
1714 static int
1715 xfs_fc_reconfigure(
1716         struct fs_context *fc)
1717 {
1718         struct xfs_mount        *mp = XFS_M(fc->root->d_sb);
1719         struct xfs_mount        *new_mp = fc->s_fs_info;
1720         xfs_sb_t                *sbp = &mp->m_sb;
1721         int                     flags = fc->sb_flags;
1722         int                     error;
1723
1724         /* version 5 superblocks always support version counters. */
1725         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1726                 fc->sb_flags |= SB_I_VERSION;
1727
1728         error = xfs_fc_validate_params(new_mp);
1729         if (error)
1730                 return error;
1731
1732         sync_filesystem(mp->m_super);
1733
1734         /* inode32 -> inode64 */
1735         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) &&
1736             !(new_mp->m_flags & XFS_MOUNT_SMALL_INUMS)) {
1737                 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1738                 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1739         }
1740
1741         /* inode64 -> inode32 */
1742         if (!(mp->m_flags & XFS_MOUNT_SMALL_INUMS) &&
1743             (new_mp->m_flags & XFS_MOUNT_SMALL_INUMS)) {
1744                 mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1745                 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1746         }
1747
1748         /* ro -> rw */
1749         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(flags & SB_RDONLY)) {
1750                 error = xfs_remount_rw(mp);
1751                 if (error)
1752                         return error;
1753         }
1754
1755         /* rw -> ro */
1756         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (flags & SB_RDONLY)) {
1757                 error = xfs_remount_ro(mp);
1758                 if (error)
1759                         return error;
1760         }
1761
1762         return 0;
1763 }
1764
1765 static void xfs_fc_free(
1766         struct fs_context       *fc)
1767 {
1768         struct xfs_mount        *mp = fc->s_fs_info;
1769
1770         /*
1771          * mp is stored in the fs_context when it is initialized.
1772          * mp is transferred to the superblock on a successful mount,
1773          * but if an error occurs before the transfer we have to free
1774          * it here.
1775          */
1776         if (mp)
1777                 xfs_mount_free(mp);
1778 }
1779
1780 static const struct fs_context_operations xfs_context_ops = {
1781         .parse_param = xfs_fc_parse_param,
1782         .get_tree    = xfs_fc_get_tree,
1783         .reconfigure = xfs_fc_reconfigure,
1784         .free        = xfs_fc_free,
1785 };
1786
1787 static int xfs_init_fs_context(
1788         struct fs_context       *fc)
1789 {
1790         struct xfs_mount        *mp;
1791
1792         mp = kmem_alloc(sizeof(struct xfs_mount), KM_ZERO);
1793         if (!mp)
1794                 return -ENOMEM;
1795
1796         spin_lock_init(&mp->m_sb_lock);
1797         spin_lock_init(&mp->m_agirotor_lock);
1798         INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
1799         spin_lock_init(&mp->m_perag_lock);
1800         mutex_init(&mp->m_growlock);
1801         INIT_WORK(&mp->m_flush_inodes_work, xfs_flush_inodes_worker);
1802         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1803         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1804         INIT_DELAYED_WORK(&mp->m_cowblocks_work, xfs_cowblocks_worker);
1805         mp->m_kobj.kobject.kset = xfs_kset;
1806         /*
1807          * We don't create the finobt per-ag space reservation until after log
1808          * recovery, so we must set this to true so that an ifree transaction
1809          * started during log recovery will not depend on space reservations
1810          * for finobt expansion.
1811          */
1812         mp->m_finobt_nores = true;
1813
1814         /*
1815          * These can be overridden by the mount option parsing.
1816          */
1817         mp->m_logbufs = -1;
1818         mp->m_logbsize = -1;
1819         mp->m_allocsize_log = 16; /* 64k */
1820
1821         /*
1822          * Copy binary VFS mount flags we are interested in.
1823          */
1824         if (fc->sb_flags & SB_RDONLY)
1825                 mp->m_flags |= XFS_MOUNT_RDONLY;
1826         if (fc->sb_flags & SB_DIRSYNC)
1827                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
1828         if (fc->sb_flags & SB_SYNCHRONOUS)
1829                 mp->m_flags |= XFS_MOUNT_WSYNC;
1830
1831         fc->s_fs_info = mp;
1832         fc->ops = &xfs_context_ops;
1833
1834         return 0;
1835 }
1836
1837 static struct file_system_type xfs_fs_type = {
1838         .owner                  = THIS_MODULE,
1839         .name                   = "xfs",
1840         .init_fs_context        = xfs_init_fs_context,
1841         .parameters             = xfs_fs_parameters,
1842         .kill_sb                = kill_block_super,
1843         .fs_flags               = FS_REQUIRES_DEV,
1844 };
1845 MODULE_ALIAS_FS("xfs");
1846
1847 STATIC int __init
1848 xfs_init_zones(void)
1849 {
1850         xfs_log_ticket_zone = kmem_cache_create("xfs_log_ticket",
1851                                                 sizeof(struct xlog_ticket),
1852                                                 0, 0, NULL);
1853         if (!xfs_log_ticket_zone)
1854                 goto out;
1855
1856         xfs_bmap_free_item_zone = kmem_cache_create("xfs_bmap_free_item",
1857                                         sizeof(struct xfs_extent_free_item),
1858                                         0, 0, NULL);
1859         if (!xfs_bmap_free_item_zone)
1860                 goto out_destroy_log_ticket_zone;
1861
1862         xfs_btree_cur_zone = kmem_cache_create("xfs_btree_cur",
1863                                                sizeof(struct xfs_btree_cur),
1864                                                0, 0, NULL);
1865         if (!xfs_btree_cur_zone)
1866                 goto out_destroy_bmap_free_item_zone;
1867
1868         xfs_da_state_zone = kmem_cache_create("xfs_da_state",
1869                                               sizeof(struct xfs_da_state),
1870                                               0, 0, NULL);
1871         if (!xfs_da_state_zone)
1872                 goto out_destroy_btree_cur_zone;
1873
1874         xfs_ifork_zone = kmem_cache_create("xfs_ifork",
1875                                            sizeof(struct xfs_ifork),
1876                                            0, 0, NULL);
1877         if (!xfs_ifork_zone)
1878                 goto out_destroy_da_state_zone;
1879
1880         xfs_trans_zone = kmem_cache_create("xf_trans",
1881                                            sizeof(struct xfs_trans),
1882                                            0, 0, NULL);
1883         if (!xfs_trans_zone)
1884                 goto out_destroy_ifork_zone;
1885
1886
1887         /*
1888          * The size of the zone allocated buf log item is the maximum
1889          * size possible under XFS.  This wastes a little bit of memory,
1890          * but it is much faster.
1891          */
1892         xfs_buf_item_zone = kmem_cache_create("xfs_buf_item",
1893                                               sizeof(struct xfs_buf_log_item),
1894                                               0, 0, NULL);
1895         if (!xfs_buf_item_zone)
1896                 goto out_destroy_trans_zone;
1897
1898         xfs_efd_zone = kmem_cache_create("xfs_efd_item",
1899                                         (sizeof(struct xfs_efd_log_item) +
1900                                         (XFS_EFD_MAX_FAST_EXTENTS - 1) *
1901                                         sizeof(struct xfs_extent)),
1902                                         0, 0, NULL);
1903         if (!xfs_efd_zone)
1904                 goto out_destroy_buf_item_zone;
1905
1906         xfs_efi_zone = kmem_cache_create("xfs_efi_item",
1907                                          (sizeof(struct xfs_efi_log_item) +
1908                                          (XFS_EFI_MAX_FAST_EXTENTS - 1) *
1909                                          sizeof(struct xfs_extent)),
1910                                          0, 0, NULL);
1911         if (!xfs_efi_zone)
1912                 goto out_destroy_efd_zone;
1913
1914         xfs_inode_zone = kmem_cache_create("xfs_inode",
1915                                            sizeof(struct xfs_inode), 0,
1916                                            (SLAB_HWCACHE_ALIGN |
1917                                             SLAB_RECLAIM_ACCOUNT |
1918                                             SLAB_MEM_SPREAD | SLAB_ACCOUNT),
1919                                            xfs_fs_inode_init_once);
1920         if (!xfs_inode_zone)
1921                 goto out_destroy_efi_zone;
1922
1923         xfs_ili_zone = kmem_cache_create("xfs_ili",
1924                                          sizeof(struct xfs_inode_log_item), 0,
1925                                          SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
1926                                          NULL);
1927         if (!xfs_ili_zone)
1928                 goto out_destroy_inode_zone;
1929
1930         xfs_icreate_zone = kmem_cache_create("xfs_icr",
1931                                              sizeof(struct xfs_icreate_item),
1932                                              0, 0, NULL);
1933         if (!xfs_icreate_zone)
1934                 goto out_destroy_ili_zone;
1935
1936         xfs_rud_zone = kmem_cache_create("xfs_rud_item",
1937                                          sizeof(struct xfs_rud_log_item),
1938                                          0, 0, NULL);
1939         if (!xfs_rud_zone)
1940                 goto out_destroy_icreate_zone;
1941
1942         xfs_rui_zone = kmem_cache_create("xfs_rui_item",
1943                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
1944                         0, 0, NULL);
1945         if (!xfs_rui_zone)
1946                 goto out_destroy_rud_zone;
1947
1948         xfs_cud_zone = kmem_cache_create("xfs_cud_item",
1949                                          sizeof(struct xfs_cud_log_item),
1950                                          0, 0, NULL);
1951         if (!xfs_cud_zone)
1952                 goto out_destroy_rui_zone;
1953
1954         xfs_cui_zone = kmem_cache_create("xfs_cui_item",
1955                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
1956                         0, 0, NULL);
1957         if (!xfs_cui_zone)
1958                 goto out_destroy_cud_zone;
1959
1960         xfs_bud_zone = kmem_cache_create("xfs_bud_item",
1961                                          sizeof(struct xfs_bud_log_item),
1962                                          0, 0, NULL);
1963         if (!xfs_bud_zone)
1964                 goto out_destroy_cui_zone;
1965
1966         xfs_bui_zone = kmem_cache_create("xfs_bui_item",
1967                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
1968                         0, 0, NULL);
1969         if (!xfs_bui_zone)
1970                 goto out_destroy_bud_zone;
1971
1972         return 0;
1973
1974  out_destroy_bud_zone:
1975         kmem_cache_destroy(xfs_bud_zone);
1976  out_destroy_cui_zone:
1977         kmem_cache_destroy(xfs_cui_zone);
1978  out_destroy_cud_zone:
1979         kmem_cache_destroy(xfs_cud_zone);
1980  out_destroy_rui_zone:
1981         kmem_cache_destroy(xfs_rui_zone);
1982  out_destroy_rud_zone:
1983         kmem_cache_destroy(xfs_rud_zone);
1984  out_destroy_icreate_zone:
1985         kmem_cache_destroy(xfs_icreate_zone);
1986  out_destroy_ili_zone:
1987         kmem_cache_destroy(xfs_ili_zone);
1988  out_destroy_inode_zone:
1989         kmem_cache_destroy(xfs_inode_zone);
1990  out_destroy_efi_zone:
1991         kmem_cache_destroy(xfs_efi_zone);
1992  out_destroy_efd_zone:
1993         kmem_cache_destroy(xfs_efd_zone);
1994  out_destroy_buf_item_zone:
1995         kmem_cache_destroy(xfs_buf_item_zone);
1996  out_destroy_trans_zone:
1997         kmem_cache_destroy(xfs_trans_zone);
1998  out_destroy_ifork_zone:
1999         kmem_cache_destroy(xfs_ifork_zone);
2000  out_destroy_da_state_zone:
2001         kmem_cache_destroy(xfs_da_state_zone);
2002  out_destroy_btree_cur_zone:
2003         kmem_cache_destroy(xfs_btree_cur_zone);
2004  out_destroy_bmap_free_item_zone:
2005         kmem_cache_destroy(xfs_bmap_free_item_zone);
2006  out_destroy_log_ticket_zone:
2007         kmem_cache_destroy(xfs_log_ticket_zone);
2008  out:
2009         return -ENOMEM;
2010 }
2011
2012 STATIC void
2013 xfs_destroy_zones(void)
2014 {
2015         /*
2016          * Make sure all delayed rcu free are flushed before we
2017          * destroy caches.
2018          */
2019         rcu_barrier();
2020         kmem_cache_destroy(xfs_bui_zone);
2021         kmem_cache_destroy(xfs_bud_zone);
2022         kmem_cache_destroy(xfs_cui_zone);
2023         kmem_cache_destroy(xfs_cud_zone);
2024         kmem_cache_destroy(xfs_rui_zone);
2025         kmem_cache_destroy(xfs_rud_zone);
2026         kmem_cache_destroy(xfs_icreate_zone);
2027         kmem_cache_destroy(xfs_ili_zone);
2028         kmem_cache_destroy(xfs_inode_zone);
2029         kmem_cache_destroy(xfs_efi_zone);
2030         kmem_cache_destroy(xfs_efd_zone);
2031         kmem_cache_destroy(xfs_buf_item_zone);
2032         kmem_cache_destroy(xfs_trans_zone);
2033         kmem_cache_destroy(xfs_ifork_zone);
2034         kmem_cache_destroy(xfs_da_state_zone);
2035         kmem_cache_destroy(xfs_btree_cur_zone);
2036         kmem_cache_destroy(xfs_bmap_free_item_zone);
2037         kmem_cache_destroy(xfs_log_ticket_zone);
2038 }
2039
2040 STATIC int __init
2041 xfs_init_workqueues(void)
2042 {
2043         /*
2044          * The allocation workqueue can be used in memory reclaim situations
2045          * (writepage path), and parallelism is only limited by the number of
2046          * AGs in all the filesystems mounted. Hence use the default large
2047          * max_active value for this workqueue.
2048          */
2049         xfs_alloc_wq = alloc_workqueue("xfsalloc",
2050                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
2051         if (!xfs_alloc_wq)
2052                 return -ENOMEM;
2053
2054         xfs_discard_wq = alloc_workqueue("xfsdiscard", WQ_UNBOUND, 0);
2055         if (!xfs_discard_wq)
2056                 goto out_free_alloc_wq;
2057
2058         return 0;
2059 out_free_alloc_wq:
2060         destroy_workqueue(xfs_alloc_wq);
2061         return -ENOMEM;
2062 }
2063
2064 STATIC void
2065 xfs_destroy_workqueues(void)
2066 {
2067         destroy_workqueue(xfs_discard_wq);
2068         destroy_workqueue(xfs_alloc_wq);
2069 }
2070
2071 STATIC int __init
2072 init_xfs_fs(void)
2073 {
2074         int                     error;
2075
2076         xfs_check_ondisk_structs();
2077
2078         printk(KERN_INFO XFS_VERSION_STRING " with "
2079                          XFS_BUILD_OPTIONS " enabled\n");
2080
2081         xfs_dir_startup();
2082
2083         error = xfs_init_zones();
2084         if (error)
2085                 goto out;
2086
2087         error = xfs_init_workqueues();
2088         if (error)
2089                 goto out_destroy_zones;
2090
2091         error = xfs_mru_cache_init();
2092         if (error)
2093                 goto out_destroy_wq;
2094
2095         error = xfs_buf_init();
2096         if (error)
2097                 goto out_mru_cache_uninit;
2098
2099         error = xfs_init_procfs();
2100         if (error)
2101                 goto out_buf_terminate;
2102
2103         error = xfs_sysctl_register();
2104         if (error)
2105                 goto out_cleanup_procfs;
2106
2107         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2108         if (!xfs_kset) {
2109                 error = -ENOMEM;
2110                 goto out_sysctl_unregister;
2111         }
2112
2113         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2114
2115         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2116         if (!xfsstats.xs_stats) {
2117                 error = -ENOMEM;
2118                 goto out_kset_unregister;
2119         }
2120
2121         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2122                                "stats");
2123         if (error)
2124                 goto out_free_stats;
2125
2126 #ifdef DEBUG
2127         xfs_dbg_kobj.kobject.kset = xfs_kset;
2128         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2129         if (error)
2130                 goto out_remove_stats_kobj;
2131 #endif
2132
2133         error = xfs_qm_init();
2134         if (error)
2135                 goto out_remove_dbg_kobj;
2136
2137         error = register_filesystem(&xfs_fs_type);
2138         if (error)
2139                 goto out_qm_exit;
2140         return 0;
2141
2142  out_qm_exit:
2143         xfs_qm_exit();
2144  out_remove_dbg_kobj:
2145 #ifdef DEBUG
2146         xfs_sysfs_del(&xfs_dbg_kobj);
2147  out_remove_stats_kobj:
2148 #endif
2149         xfs_sysfs_del(&xfsstats.xs_kobj);
2150  out_free_stats:
2151         free_percpu(xfsstats.xs_stats);
2152  out_kset_unregister:
2153         kset_unregister(xfs_kset);
2154  out_sysctl_unregister:
2155         xfs_sysctl_unregister();
2156  out_cleanup_procfs:
2157         xfs_cleanup_procfs();
2158  out_buf_terminate:
2159         xfs_buf_terminate();
2160  out_mru_cache_uninit:
2161         xfs_mru_cache_uninit();
2162  out_destroy_wq:
2163         xfs_destroy_workqueues();
2164  out_destroy_zones:
2165         xfs_destroy_zones();
2166  out:
2167         return error;
2168 }
2169
2170 STATIC void __exit
2171 exit_xfs_fs(void)
2172 {
2173         xfs_qm_exit();
2174         unregister_filesystem(&xfs_fs_type);
2175 #ifdef DEBUG
2176         xfs_sysfs_del(&xfs_dbg_kobj);
2177 #endif
2178         xfs_sysfs_del(&xfsstats.xs_kobj);
2179         free_percpu(xfsstats.xs_stats);
2180         kset_unregister(xfs_kset);
2181         xfs_sysctl_unregister();
2182         xfs_cleanup_procfs();
2183         xfs_buf_terminate();
2184         xfs_mru_cache_uninit();
2185         xfs_destroy_workqueues();
2186         xfs_destroy_zones();
2187         xfs_uuid_table_free();
2188 }
2189
2190 module_init(init_xfs_fs);
2191 module_exit(exit_xfs_fs);
2192
2193 MODULE_AUTHOR("Silicon Graphics, Inc.");
2194 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2195 MODULE_LICENSE("GPL");