fs/gfs2/ops_fstype.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/sched.h>
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/blkdev.h>
  15 #include <linux/kthread.h>
  16 #include <linux/export.h>
  17 #include <linux/namei.h>
  18 #include <linux/mount.h>
  19 #include <linux/gfs2_ondisk.h>
  20 #include <linux/quotaops.h>
  21 #include <linux/lockdep.h>
  22 #include <linux/module.h>
  23 #include <linux/backing-dev.h>
  24 #include <linux/fs_parser.h>
  25
  26 #include "gfs2.h"
  27 #include "incore.h"
  28 #include "bmap.h"
  29 #include "glock.h"
  30 #include "glops.h"
  31 #include "inode.h"
  32 #include "recovery.h"
  33 #include "rgrp.h"
  34 #include "super.h"
  35 #include "sys.h"
  36 #include "util.h"
  37 #include "log.h"
  38 #include "quota.h"
  39 #include "dir.h"
  40 #include "meta_io.h"
  41 #include "trace_gfs2.h"
  42 #include "lops.h"
  43
  44 #define DO 0
  45 #define UNDO 1
  46
  47 /**
  48  * gfs2_tune_init - Fill a gfs2_tune structure with default values
  49  * @gt: tune
  50  *
  51  */
  52
  53 static void gfs2_tune_init(struct gfs2_tune *gt)
  54 {
  55         spin_lock_init(&gt->gt_spin);
  56
  57         gt->gt_quota_warn_period = 10;
  58         gt->gt_quota_scale_num = 1;
  59         gt->gt_quota_scale_den = 1;
  60         gt->gt_new_files_jdata = 0;
  61         gt->gt_max_readahead = BIT(18);
  62         gt->gt_complain_secs = 10;
  63 }
  64
  65 void free_sbd(struct gfs2_sbd *sdp)
  66 {
  67         if (sdp->sd_lkstats)
  68                 free_percpu(sdp->sd_lkstats);
  69         kfree(sdp);
  70 }
  71
  72 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  73 {
  74         struct gfs2_sbd *sdp;
  75         struct address_space *mapping;
  76
  77         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  78         if (!sdp)
  79                 return NULL;
  80
  81         sdp->sd_vfs = sb;
  82         sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
  83         if (!sdp->sd_lkstats)
  84                 goto fail;
  85         sb->s_fs_info = sdp;
  86
  87         set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
  88         gfs2_tune_init(&sdp->sd_tune);
  89
  90         init_waitqueue_head(&sdp->sd_glock_wait);
  91         init_waitqueue_head(&sdp->sd_async_glock_wait);
  92         atomic_set(&sdp->sd_glock_disposal, 0);
  93         init_completion(&sdp->sd_locking_init);
  94         init_completion(&sdp->sd_wdack);
  95         spin_lock_init(&sdp->sd_statfs_spin);
  96
  97         spin_lock_init(&sdp->sd_rindex_spin);
  98         sdp->sd_rindex_tree.rb_node = NULL;
  99
 100         INIT_LIST_HEAD(&sdp->sd_jindex_list);
 101         spin_lock_init(&sdp->sd_jindex_spin);
 102         mutex_init(&sdp->sd_jindex_mutex);
 103         init_completion(&sdp->sd_journal_ready);
 104
 105         INIT_LIST_HEAD(&sdp->sd_quota_list);
 106         mutex_init(&sdp->sd_quota_mutex);
 107         mutex_init(&sdp->sd_quota_sync_mutex);
 108         init_waitqueue_head(&sdp->sd_quota_wait);
 109         spin_lock_init(&sdp->sd_bitmap_lock);
 110
 111         INIT_LIST_HEAD(&sdp->sd_sc_inodes_list);
 112
 113         mapping = &sdp->sd_aspace;
 114
 115         address_space_init_once(mapping);
 116         mapping->a_ops = &gfs2_rgrp_aops;
 117         mapping->host = sb->s_bdev->bd_inode;
 118         mapping->flags = 0;
 119         mapping_set_gfp_mask(mapping, GFP_NOFS);
 120         mapping->private_data = NULL;
 121         mapping->writeback_index = 0;
 122
 123         spin_lock_init(&sdp->sd_log_lock);
 124         atomic_set(&sdp->sd_log_pinned, 0);
 125         INIT_LIST_HEAD(&sdp->sd_log_revokes);
 126         INIT_LIST_HEAD(&sdp->sd_log_ordered);
 127         spin_lock_init(&sdp->sd_ordered_lock);
 128
 129         init_waitqueue_head(&sdp->sd_log_waitq);
 130         init_waitqueue_head(&sdp->sd_logd_waitq);
 131         spin_lock_init(&sdp->sd_ail_lock);
 132         INIT_LIST_HEAD(&sdp->sd_ail1_list);
 133         INIT_LIST_HEAD(&sdp->sd_ail2_list);
 134
 135         init_rwsem(&sdp->sd_log_flush_lock);
 136         atomic_set(&sdp->sd_log_in_flight, 0);
 137         init_waitqueue_head(&sdp->sd_log_flush_wait);
 138         atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
 139         mutex_init(&sdp->sd_freeze_mutex);
 140
 141         return sdp;
 142
 143 fail:
 144         free_sbd(sdp);
 145         return NULL;
 146 }
 147
 148 /**
 149  * gfs2_check_sb - Check superblock
 150  * @sdp: the filesystem
 151  * @silent: Don't print a message if the check fails
 152  *
 153  * Checks the version code of the FS is one that we understand how to
 154  * read and that the sizes of the various on-disk structures have not
 155  * changed.
 156  */
 157
 158 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
 159 {
 160         struct gfs2_sb_host *sb = &sdp->sd_sb;
 161
 162         if (sb->sb_magic != GFS2_MAGIC ||
 163             sb->sb_type != GFS2_METATYPE_SB) {
 164                 if (!silent)
 165                         pr_warn("not a GFS2 filesystem\n");
 166                 return -EINVAL;
 167         }
 168
 169         if (sb->sb_fs_format < GFS2_FS_FORMAT_MIN ||
 170             sb->sb_fs_format > GFS2_FS_FORMAT_MAX ||
 171             sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
 172                 fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
 173                 return -EINVAL;
 174         }
 175
 176         if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE ||
 177             (sb->sb_bsize & (sb->sb_bsize - 1))) {
 178                 pr_warn("Invalid block size\n");
 179                 return -EINVAL;
 180         }
 181         if (sb->sb_bsize_shift != ffs(sb->sb_bsize) - 1) {
 182                 pr_warn("Invalid block size shift\n");
 183                 return -EINVAL;
 184         }
 185         return 0;
 186 }
 187
 188 static void end_bio_io_page(struct bio *bio)
 189 {
 190         struct page *page = bio->bi_private;
 191
 192         if (!bio->bi_status)
 193                 SetPageUptodate(page);
 194         else
 195                 pr_warn("error %d reading superblock\n", bio->bi_status);
 196         unlock_page(page);
 197 }
 198
 199 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
 200 {
 201         struct gfs2_sb_host *sb = &sdp->sd_sb;
 202         struct super_block *s = sdp->sd_vfs;
 203         const struct gfs2_sb *str = buf;
 204
 205         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
 206         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
 207         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
 208         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
 209         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
 210         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
 211         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
 212         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
 213         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
 214         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
 215
 216         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
 217         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
 218         memcpy(&s->s_uuid, str->sb_uuid, 16);
 219 }
 220
 221 /**
 222  * gfs2_read_super - Read the gfs2 super block from disk
 223  * @sdp: The GFS2 super block
 224  * @sector: The location of the super block
 225  * @silent: Don't print a message if the check fails
 226  *
 227  * This uses the bio functions to read the super block from disk
 228  * because we want to be 100% sure that we never read cached data.
 229  * A super block is read twice only during each GFS2 mount and is
 230  * never written to by the filesystem. The first time its read no
 231  * locks are held, and the only details which are looked at are those
 232  * relating to the locking protocol. Once locking is up and working,
 233  * the sb is read again under the lock to establish the location of
 234  * the master directory (contains pointers to journals etc) and the
 235  * root directory.
 236  *
 237  * Returns: 0 on success or error
 238  */
 239
 240 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
 241 {
 242         struct super_block *sb = sdp->sd_vfs;
 243         struct gfs2_sb *p;
 244         struct page *page;
 245         struct bio *bio;
 246
 247         page = alloc_page(GFP_NOFS);
 248         if (unlikely(!page))
 249                 return -ENOMEM;
 250
 251         ClearPageUptodate(page);
 252         ClearPageDirty(page);
 253         lock_page(page);
 254
 255         bio = bio_alloc(sb->s_bdev, 1, REQ_OP_READ | REQ_META, GFP_NOFS);
 256         bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
 257         __bio_add_page(bio, page, PAGE_SIZE, 0);
 258
 259         bio->bi_end_io = end_bio_io_page;
 260         bio->bi_private = page;
 261         submit_bio(bio);
 262         wait_on_page_locked(page);
 263         bio_put(bio);
 264         if (!PageUptodate(page)) {
 265                 __free_page(page);
 266                 return -EIO;
 267         }
 268         p = kmap(page);
 269         gfs2_sb_in(sdp, p);
 270         kunmap(page);
 271         __free_page(page);
 272         return gfs2_check_sb(sdp, silent);
 273 }
 274
 275 /**
 276  * gfs2_read_sb - Read super block
 277  * @sdp: The GFS2 superblock
 278  * @silent: Don't print message if mount fails
 279  *
 280  */
 281
 282 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
 283 {
 284         u32 hash_blocks, ind_blocks, leaf_blocks;
 285         u32 tmp_blocks;
 286         unsigned int x;
 287         int error;
 288
 289         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 290         if (error) {
 291                 if (!silent)
 292                         fs_err(sdp, "can't read superblock\n");
 293                 return error;
 294         }
 295
 296         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 297                                GFS2_BASIC_BLOCK_SHIFT;
 298         sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
 299         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 300                           sizeof(struct gfs2_dinode)) / sizeof(u64);
 301         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 302                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
 303         sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize -
 304                           sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
 305         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 306         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 307         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 308         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 309         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 310                                 sizeof(struct gfs2_meta_header)) /
 311                                 sizeof(struct gfs2_quota_change);
 312         sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
 313                                      sizeof(struct gfs2_meta_header))
 314                 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
 315
 316         /*
 317          * We always keep at least one block reserved for revokes in
 318          * transactions.  This greatly simplifies allocating additional
 319          * revoke blocks.
 320          */
 321         atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs);
 322
 323         /* Compute maximum reservation required to add a entry to a directory */
 324
 325         hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
 326                              sdp->sd_jbsize);
 327
 328         ind_blocks = 0;
 329         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
 330                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
 331                 ind_blocks += tmp_blocks;
 332         }
 333
 334         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
 335
 336         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
 337
 338         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
 339                                 sizeof(struct gfs2_dinode);
 340         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
 341         for (x = 2;; x++) {
 342                 u64 space, d;
 343                 u32 m;
 344
 345                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
 346                 d = space;
 347                 m = do_div(d, sdp->sd_inptrs);
 348
 349                 if (d != sdp->sd_heightsize[x - 1] || m)
 350                         break;
 351                 sdp->sd_heightsize[x] = space;
 352         }
 353         sdp->sd_max_height = x;
 354         sdp->sd_heightsize[x] = ~0;
 355         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
 356
 357         sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
 358                                       sizeof(struct gfs2_leaf)) /
 359                                      GFS2_MIN_DIRENT_SIZE;
 360         return 0;
 361 }
 362
 363 static int init_names(struct gfs2_sbd *sdp, int silent)
 364 {
 365         char *proto, *table;
 366         int error = 0;
 367
 368         proto = sdp->sd_args.ar_lockproto;
 369         table = sdp->sd_args.ar_locktable;
 370
 371         /*  Try to autodetect  */
 372
 373         if (!proto[0] || !table[0]) {
 374                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 375                 if (error)
 376                         return error;
 377
 378                 if (!proto[0])
 379                         proto = sdp->sd_sb.sb_lockproto;
 380                 if (!table[0])
 381                         table = sdp->sd_sb.sb_locktable;
 382         }
 383
 384         if (!table[0])
 385                 table = sdp->sd_vfs->s_id;
 386
 387         BUILD_BUG_ON(GFS2_LOCKNAME_LEN > GFS2_FSNAME_LEN);
 388
 389         strscpy(sdp->sd_proto_name, proto, GFS2_LOCKNAME_LEN);
 390         strscpy(sdp->sd_table_name, table, GFS2_LOCKNAME_LEN);
 391
 392         table = sdp->sd_table_name;
 393         while ((table = strchr(table, '/')))
 394                 *table = '_';
 395
 396         return error;
 397 }
 398
 399 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 400                         int undo)
 401 {
 402         int error = 0;
 403
 404         if (undo)
 405                 goto fail_trans;
 406
 407         error = gfs2_glock_nq_num(sdp,
 408                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 409                                   LM_ST_EXCLUSIVE,
 410                                   LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
 411                                   mount_gh);
 412         if (error) {
 413                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 414                 goto fail;
 415         }
 416
 417         error = gfs2_glock_nq_num(sdp,
 418                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 419                                   LM_ST_SHARED,
 420                                   LM_FLAG_NOEXP | GL_EXACT | GL_NOPID,
 421                                   &sdp->sd_live_gh);
 422         if (error) {
 423                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 424                 goto fail_mount;
 425         }
 426
 427         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 428                                CREATE, &sdp->sd_rename_gl);
 429         if (error) {
 430                 fs_err(sdp, "can't create rename glock: %d\n", error);
 431                 goto fail_live;
 432         }
 433
 434         error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
 435                                CREATE, &sdp->sd_freeze_gl);
 436         if (error) {
 437                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 438                 goto fail_rename;
 439         }
 440
 441         return 0;
 442
 443 fail_trans:
 444         gfs2_glock_put(sdp->sd_freeze_gl);
 445 fail_rename:
 446         gfs2_glock_put(sdp->sd_rename_gl);
 447 fail_live:
 448         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 449 fail_mount:
 450         gfs2_glock_dq_uninit(mount_gh);
 451 fail:
 452         return error;
 453 }
 454
 455 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
 456                             u64 no_addr, const char *name)
 457 {
 458         struct gfs2_sbd *sdp = sb->s_fs_info;
 459         struct dentry *dentry;
 460         struct inode *inode;
 461
 462         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
 463                                   GFS2_BLKST_FREE /* ignore */);
 464         if (IS_ERR(inode)) {
 465                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
 466                 return PTR_ERR(inode);
 467         }
 468         dentry = d_make_root(inode);
 469         if (!dentry) {
 470                 fs_err(sdp, "can't alloc %s dentry\n", name);
 471                 return -ENOMEM;
 472         }
 473         *dptr = dentry;
 474         return 0;
 475 }
 476
 477 static int init_sb(struct gfs2_sbd *sdp, int silent)
 478 {
 479         struct super_block *sb = sdp->sd_vfs;
 480         struct gfs2_holder sb_gh;
 481         u64 no_addr;
 482         int ret;
 483
 484         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 485                                 LM_ST_SHARED, 0, &sb_gh);
 486         if (ret) {
 487                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
 488                 return ret;
 489         }
 490
 491         ret = gfs2_read_sb(sdp, silent);
 492         if (ret) {
 493                 fs_err(sdp, "can't read superblock: %d\n", ret);
 494                 goto out;
 495         }
 496
 497         switch(sdp->sd_sb.sb_fs_format) {
 498         case GFS2_FS_FORMAT_MAX:
 499                 sb->s_xattr = gfs2_xattr_handlers_max;
 500                 break;
 501
 502         case GFS2_FS_FORMAT_MIN:
 503                 sb->s_xattr = gfs2_xattr_handlers_min;
 504                 break;
 505
 506         default:
 507                 BUG();
 508         }
 509
 510         /* Set up the buffer cache and SB for real */
 511         if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
 512                 ret = -EINVAL;
 513                 fs_err(sdp, "FS block size (%u) is too small for device "
 514                        "block size (%u)\n",
 515                        sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
 516                 goto out;
 517         }
 518         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 519                 ret = -EINVAL;
 520                 fs_err(sdp, "FS block size (%u) is too big for machine "
 521                        "page size (%u)\n",
 522                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 523                 goto out;
 524         }
 525         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 526
 527         /* Get the root inode */
 528         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 529         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 530         if (ret)
 531                 goto out;
 532
 533         /* Get the master inode */
 534         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 535         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 536         if (ret) {
 537                 dput(sdp->sd_root_dir);
 538                 goto out;
 539         }
 540         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 541 out:
 542         gfs2_glock_dq_uninit(&sb_gh);
 543         return ret;
 544 }
 545
 546 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
 547 {
 548         char *message = "FIRSTMOUNT=Done";
 549         char *envp[] = { message, NULL };
 550
 551         fs_info(sdp, "first mount done, others may mount\n");
 552
 553         if (sdp->sd_lockstruct.ls_ops->lm_first_done)
 554                 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
 555
 556         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
 557 }
 558
 559 /**
 560  * gfs2_jindex_hold - Grab a lock on the jindex
 561  * @sdp: The GFS2 superblock
 562  * @ji_gh: the holder for the jindex glock
 563  *
 564  * Returns: errno
 565  */
 566
 567 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 568 {
 569         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
 570         struct qstr name;
 571         char buf[20];
 572         struct gfs2_jdesc *jd;
 573         int error;
 574
 575         name.name = buf;
 576
 577         mutex_lock(&sdp->sd_jindex_mutex);
 578
 579         for (;;) {
 580                 struct gfs2_inode *jip;
 581
 582                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
 583                 if (error)
 584                         break;
 585
 586                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
 587                 name.hash = gfs2_disk_hash(name.name, name.len);
 588
 589                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
 590                 if (error == -ENOENT) {
 591                         error = 0;
 592                         break;
 593                 }
 594
 595                 gfs2_glock_dq_uninit(ji_gh);
 596
 597                 if (error)
 598                         break;
 599
 600                 error = -ENOMEM;
 601                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
 602                 if (!jd)
 603                         break;
 604
 605                 INIT_LIST_HEAD(&jd->extent_list);
 606                 INIT_LIST_HEAD(&jd->jd_revoke_list);
 607
 608                 INIT_WORK(&jd->jd_work, gfs2_recover_func);
 609                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
 610                 if (IS_ERR_OR_NULL(jd->jd_inode)) {
 611                         if (!jd->jd_inode)
 612                                 error = -ENOENT;
 613                         else
 614                                 error = PTR_ERR(jd->jd_inode);
 615                         kfree(jd);
 616                         break;
 617                 }
 618
 619                 d_mark_dontcache(jd->jd_inode);
 620                 spin_lock(&sdp->sd_jindex_spin);
 621                 jd->jd_jid = sdp->sd_journals++;
 622                 jip = GFS2_I(jd->jd_inode);
 623                 jd->jd_no_addr = jip->i_no_addr;
 624                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
 625                 spin_unlock(&sdp->sd_jindex_spin);
 626         }
 627
 628         mutex_unlock(&sdp->sd_jindex_mutex);
 629
 630         return error;
 631 }
 632
 633 /**
 634  * init_statfs - look up and initialize master and local (per node) statfs inodes
 635  * @sdp: The GFS2 superblock
 636  *
 637  * This should be called after the jindex is initialized in init_journal() and
 638  * before gfs2_journal_recovery() is called because we need to be able to write
 639  * to these inodes during recovery.
 640  *
 641  * Returns: errno
 642  */
 643 static int init_statfs(struct gfs2_sbd *sdp)
 644 {
 645         int error = 0;
 646         struct inode *master = d_inode(sdp->sd_master_dir);
 647         struct inode *pn = NULL;
 648         char buf[30];
 649         struct gfs2_jdesc *jd;
 650         struct gfs2_inode *ip;
 651
 652         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 653         if (IS_ERR(sdp->sd_statfs_inode)) {
 654                 error = PTR_ERR(sdp->sd_statfs_inode);
 655                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 656                 goto out;
 657         }
 658         if (sdp->sd_args.ar_spectator)
 659                 goto out;
 660
 661         pn = gfs2_lookup_simple(master, "per_node");
 662         if (IS_ERR(pn)) {
 663                 error = PTR_ERR(pn);
 664                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 665                 goto put_statfs;
 666         }
 667
 668         /* For each jid, lookup the corresponding local statfs inode in the
 669          * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */
 670         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 671                 struct local_statfs_inode *lsi =
 672                         kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS);
 673                 if (!lsi) {
 674                         error = -ENOMEM;
 675                         goto free_local;
 676                 }
 677                 sprintf(buf, "statfs_change%u", jd->jd_jid);
 678                 lsi->si_sc_inode = gfs2_lookup_simple(pn, buf);
 679                 if (IS_ERR(lsi->si_sc_inode)) {
 680                         error = PTR_ERR(lsi->si_sc_inode);
 681                         fs_err(sdp, "can't find local \"sc\" file#%u: %d\n",
 682                                jd->jd_jid, error);
 683                         kfree(lsi);
 684                         goto free_local;
 685                 }
 686                 lsi->si_jid = jd->jd_jid;
 687                 if (jd->jd_jid == sdp->sd_jdesc->jd_jid)
 688                         sdp->sd_sc_inode = lsi->si_sc_inode;
 689
 690                 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list);
 691         }
 692
 693         iput(pn);
 694         pn = NULL;
 695         ip = GFS2_I(sdp->sd_sc_inode);
 696         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
 697                                    &sdp->sd_sc_gh);
 698         if (error) {
 699                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 700                 goto free_local;
 701         }
 702         /* read in the local statfs buffer - other nodes don't change it. */
 703         error = gfs2_meta_inode_buffer(ip, &sdp->sd_sc_bh);
 704         if (error) {
 705                 fs_err(sdp, "Cannot read in local statfs: %d\n", error);
 706                 goto unlock_sd_gh;
 707         }
 708         return 0;
 709
 710 unlock_sd_gh:
 711         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 712 free_local:
 713         free_local_statfs_inodes(sdp);
 714         iput(pn);
 715 put_statfs:
 716         iput(sdp->sd_statfs_inode);
 717 out:
 718         return error;
 719 }
 720
 721 /* Uninitialize and free up memory used by the list of statfs inodes */
 722 static void uninit_statfs(struct gfs2_sbd *sdp)
 723 {
 724         if (!sdp->sd_args.ar_spectator) {
 725                 brelse(sdp->sd_sc_bh);
 726                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 727                 free_local_statfs_inodes(sdp);
 728         }
 729         iput(sdp->sd_statfs_inode);
 730 }
 731
 732 static int init_journal(struct gfs2_sbd *sdp, int undo)
 733 {
 734         struct inode *master = d_inode(sdp->sd_master_dir);
 735         struct gfs2_holder ji_gh;
 736         struct gfs2_inode *ip;
 737         int error = 0;
 738
 739         gfs2_holder_mark_uninitialized(&ji_gh);
 740         if (undo)
 741                 goto fail_statfs;
 742
 743         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
 744         if (IS_ERR(sdp->sd_jindex)) {
 745                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 746                 return PTR_ERR(sdp->sd_jindex);
 747         }
 748
 749         /* Load in the journal index special file */
 750
 751         error = gfs2_jindex_hold(sdp, &ji_gh);
 752         if (error) {
 753                 fs_err(sdp, "can't read journal index: %d\n", error);
 754                 goto fail;
 755         }
 756
 757         error = -EUSERS;
 758         if (!gfs2_jindex_size(sdp)) {
 759                 fs_err(sdp, "no journals!\n");
 760                 goto fail_jindex;
 761         }
 762
 763         atomic_set(&sdp->sd_log_blks_needed, 0);
 764         if (sdp->sd_args.ar_spectator) {
 765                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 766                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 767                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 768                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 769         } else {
 770                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 771                         fs_err(sdp, "can't mount journal #%u\n",
 772                                sdp->sd_lockstruct.ls_jid);
 773                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 774                                gfs2_jindex_size(sdp),
 775                                gfs2_jindex_size(sdp) - 1);
 776                         goto fail_jindex;
 777                 }
 778                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 779
 780                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 781                                           &gfs2_journal_glops,
 782                                           LM_ST_EXCLUSIVE,
 783                                           LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
 784                                           &sdp->sd_journal_gh);
 785                 if (error) {
 786                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 787                         goto fail_jindex;
 788                 }
 789
 790                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 791                 sdp->sd_jinode_gl = ip->i_gl;
 792                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 793                                            LM_FLAG_NOEXP | GL_EXACT |
 794                                            GL_NOCACHE | GL_NOPID,
 795                                            &sdp->sd_jinode_gh);
 796                 if (error) {
 797                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 798                                error);
 799                         goto fail_journal_gh;
 800                 }
 801
 802                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 803                 if (error) {
 804                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 805                                sdp->sd_jdesc->jd_jid, error);
 806                         goto fail_jinode_gh;
 807                 }
 808                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 809                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 810                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 811
 812                 /* Map the extents for this journal's blocks */
 813                 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
 814         }
 815         trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
 816
 817         /* Lookup statfs inodes here so journal recovery can use them. */
 818         error = init_statfs(sdp);
 819         if (error)
 820                 goto fail_jinode_gh;
 821
 822         if (sdp->sd_lockstruct.ls_first) {
 823                 unsigned int x;
 824                 for (x = 0; x < sdp->sd_journals; x++) {
 825                         struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
 826
 827                         if (sdp->sd_args.ar_spectator) {
 828                                 error = check_journal_clean(sdp, jd, true);
 829                                 if (error)
 830                                         goto fail_statfs;
 831                                 continue;
 832                         }
 833                         error = gfs2_recover_journal(jd, true);
 834                         if (error) {
 835                                 fs_err(sdp, "error recovering journal %u: %d\n",
 836                                        x, error);
 837                                 goto fail_statfs;
 838                         }
 839                 }
 840
 841                 gfs2_others_may_mount(sdp);
 842         } else if (!sdp->sd_args.ar_spectator) {
 843                 error = gfs2_recover_journal(sdp->sd_jdesc, true);
 844                 if (error) {
 845                         fs_err(sdp, "error recovering my journal: %d\n", error);
 846                         goto fail_statfs;
 847                 }
 848         }
 849
 850         sdp->sd_log_idle = 1;
 851         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 852         gfs2_glock_dq_uninit(&ji_gh);
 853         INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
 854         return 0;
 855
 856 fail_statfs:
 857         uninit_statfs(sdp);
 858 fail_jinode_gh:
 859         /* A withdraw may have done dq/uninit so now we need to check it */
 860         if (!sdp->sd_args.ar_spectator &&
 861             gfs2_holder_initialized(&sdp->sd_jinode_gh))
 862                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 863 fail_journal_gh:
 864         if (!sdp->sd_args.ar_spectator &&
 865             gfs2_holder_initialized(&sdp->sd_journal_gh))
 866                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 867 fail_jindex:
 868         gfs2_jindex_free(sdp);
 869         if (gfs2_holder_initialized(&ji_gh))
 870                 gfs2_glock_dq_uninit(&ji_gh);
 871 fail:
 872         iput(sdp->sd_jindex);
 873         return error;
 874 }
 875
 876 static struct lock_class_key gfs2_quota_imutex_key;
 877
 878 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 879 {
 880         int error = 0;
 881         struct inode *master = d_inode(sdp->sd_master_dir);
 882
 883         if (undo)
 884                 goto fail_qinode;
 885
 886         error = init_journal(sdp, undo);
 887         complete_all(&sdp->sd_journal_ready);
 888         if (error)
 889                 goto fail;
 890
 891         /* Read in the resource index inode */
 892         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 893         if (IS_ERR(sdp->sd_rindex)) {
 894                 error = PTR_ERR(sdp->sd_rindex);
 895                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 896                 goto fail_journal;
 897         }
 898         sdp->sd_rindex_uptodate = 0;
 899
 900         /* Read in the quota inode */
 901         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 902         if (IS_ERR(sdp->sd_quota_inode)) {
 903                 error = PTR_ERR(sdp->sd_quota_inode);
 904                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 905                 goto fail_rindex;
 906         }
 907         /*
 908          * i_rwsem on quota files is special. Since this inode is hidden system
 909          * file, we are safe to define locking ourselves.
 910          */
 911         lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
 912                           &gfs2_quota_imutex_key);
 913
 914         error = gfs2_rindex_update(sdp);
 915         if (error)
 916                 goto fail_qinode;
 917
 918         return 0;
 919
 920 fail_qinode:
 921         iput(sdp->sd_quota_inode);
 922 fail_rindex:
 923         gfs2_clear_rgrpd(sdp);
 924         iput(sdp->sd_rindex);
 925 fail_journal:
 926         init_journal(sdp, UNDO);
 927 fail:
 928         return error;
 929 }
 930
 931 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 932 {
 933         struct inode *pn = NULL;
 934         char buf[30];
 935         int error = 0;
 936         struct gfs2_inode *ip;
 937         struct inode *master = d_inode(sdp->sd_master_dir);
 938
 939         if (sdp->sd_args.ar_spectator)
 940                 return 0;
 941
 942         if (undo)
 943                 goto fail_qc_gh;
 944
 945         pn = gfs2_lookup_simple(master, "per_node");
 946         if (IS_ERR(pn)) {
 947                 error = PTR_ERR(pn);
 948                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 949                 return error;
 950         }
 951
 952         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 953         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 954         if (IS_ERR(sdp->sd_qc_inode)) {
 955                 error = PTR_ERR(sdp->sd_qc_inode);
 956                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 957                 goto fail_ut_i;
 958         }
 959
 960         iput(pn);
 961         pn = NULL;
 962
 963         ip = GFS2_I(sdp->sd_qc_inode);
 964         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
 965                                    &sdp->sd_qc_gh);
 966         if (error) {
 967                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 968                 goto fail_qc_i;
 969         }
 970
 971         return 0;
 972
 973 fail_qc_gh:
 974         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 975 fail_qc_i:
 976         iput(sdp->sd_qc_inode);
 977 fail_ut_i:
 978         iput(pn);
 979         return error;
 980 }
 981
 982 static const match_table_t nolock_tokens = {
 983         { Opt_jid, "jid=%d", },
 984         { Opt_err, NULL },
 985 };
 986
 987 static const struct lm_lockops nolock_ops = {
 988         .lm_proto_name = "lock_nolock",
 989         .lm_put_lock = gfs2_glock_free,
 990         .lm_tokens = &nolock_tokens,
 991 };
 992
 993 /**
 994  * gfs2_lm_mount - mount a locking protocol
 995  * @sdp: the filesystem
 996  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
 997  *
 998  * Returns: errno
 999  */
1000
1001 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1002 {
1003         const struct lm_lockops *lm;
1004         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1005         struct gfs2_args *args = &sdp->sd_args;
1006         const char *proto = sdp->sd_proto_name;
1007         const char *table = sdp->sd_table_name;
1008         char *o, *options;
1009         int ret;
1010
1011         if (!strcmp("lock_nolock", proto)) {
1012                 lm = &nolock_ops;
1013                 sdp->sd_args.ar_localflocks = 1;
1014 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1015         } else if (!strcmp("lock_dlm", proto)) {
1016                 lm = &gfs2_dlm_ops;
1017 #endif
1018         } else {
1019                 pr_info("can't find protocol %s\n", proto);
1020                 return -ENOENT;
1021         }
1022
1023         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1024
1025         ls->ls_ops = lm;
1026         ls->ls_first = 1;
1027
1028         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1029                 substring_t tmp[MAX_OPT_ARGS];
1030                 int token, option;
1031
1032                 if (!o || !*o)
1033                         continue;
1034
1035                 token = match_token(o, *lm->lm_tokens, tmp);
1036                 switch (token) {
1037                 case Opt_jid:
1038                         ret = match_int(&tmp[0], &option);
1039                         if (ret || option < 0)
1040                                 goto hostdata_error;
1041                         if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1042                                 ls->ls_jid = option;
1043                         break;
1044                 case Opt_id:
1045                 case Opt_nodir:
1046                         /* Obsolete, but left for backward compat purposes */
1047                         break;
1048                 case Opt_first:
1049                         ret = match_int(&tmp[0], &option);
1050                         if (ret || (option != 0 && option != 1))
1051                                 goto hostdata_error;
1052                         ls->ls_first = option;
1053                         break;
1054                 case Opt_err:
1055                 default:
1056 hostdata_error:
1057                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1058                         return -EINVAL;
1059                 }
1060         }
1061
1062         if (lm->lm_mount == NULL) {
1063                 fs_info(sdp, "Now mounting FS (format %u)...\n", sdp->sd_sb.sb_fs_format);
1064                 complete_all(&sdp->sd_locking_init);
1065                 return 0;
1066         }
1067         ret = lm->lm_mount(sdp, table);
1068         if (ret == 0)
1069                 fs_info(sdp, "Joined cluster. Now mounting FS (format %u)...\n",
1070                         sdp->sd_sb.sb_fs_format);
1071         complete_all(&sdp->sd_locking_init);
1072         return ret;
1073 }
1074
1075 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1076 {
1077         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1078         if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount)
1079                 lm->lm_unmount(sdp);
1080 }
1081
1082 static int wait_on_journal(struct gfs2_sbd *sdp)
1083 {
1084         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1085                 return 0;
1086
1087         return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1088                 ? -EINTR : 0;
1089 }
1090
1091 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1092 {
1093         struct super_block *sb = sdp->sd_vfs;
1094         char ro[20];
1095         char spectator[20];
1096         char *envp[] = { ro, spectator, NULL };
1097         sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1098         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1099         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1100 }
1101
1102 static int init_threads(struct gfs2_sbd *sdp)
1103 {
1104         struct task_struct *p;
1105         int error = 0;
1106
1107         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
1108         if (IS_ERR(p)) {
1109                 error = PTR_ERR(p);
1110                 fs_err(sdp, "can't start logd thread: %d\n", error);
1111                 return error;
1112         }
1113         sdp->sd_logd_process = p;
1114
1115         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
1116         if (IS_ERR(p)) {
1117                 error = PTR_ERR(p);
1118                 fs_err(sdp, "can't start quotad thread: %d\n", error);
1119                 goto fail;
1120         }
1121         sdp->sd_quotad_process = p;
1122         return 0;
1123
1124 fail:
1125         kthread_stop(sdp->sd_logd_process);
1126         sdp->sd_logd_process = NULL;
1127         return error;
1128 }
1129
1130 /**
1131  * gfs2_fill_super - Read in superblock
1132  * @sb: The VFS superblock
1133  * @fc: Mount options and flags
1134  *
1135  * Returns: -errno
1136  */
1137 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1138 {
1139         struct gfs2_args *args = fc->fs_private;
1140         int silent = fc->sb_flags & SB_SILENT;
1141         struct gfs2_sbd *sdp;
1142         struct gfs2_holder mount_gh;
1143         struct gfs2_holder freeze_gh;
1144         int error;
1145
1146         sdp = init_sbd(sb);
1147         if (!sdp) {
1148                 pr_warn("can't alloc struct gfs2_sbd\n");
1149                 return -ENOMEM;
1150         }
1151         sdp->sd_args = *args;
1152
1153         if (sdp->sd_args.ar_spectator) {
1154                 sb->s_flags |= SB_RDONLY;
1155                 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1156         }
1157         if (sdp->sd_args.ar_posix_acl)
1158                 sb->s_flags |= SB_POSIXACL;
1159         if (sdp->sd_args.ar_nobarrier)
1160                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1161
1162         sb->s_flags |= SB_NOSEC;
1163         sb->s_magic = GFS2_MAGIC;
1164         sb->s_op = &gfs2_super_ops;
1165         sb->s_d_op = &gfs2_dops;
1166         sb->s_export_op = &gfs2_export_ops;
1167         sb->s_qcop = &gfs2_quotactl_ops;
1168         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1169         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1170         sb->s_time_gran = 1;
1171         sb->s_maxbytes = MAX_LFS_FILESIZE;
1172
1173         /* Set up the buffer cache and fill in some fake block size values
1174            to allow us to read-in the on-disk superblock. */
1175         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1176         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1177         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1178                                GFS2_BASIC_BLOCK_SHIFT;
1179         sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1180
1181         sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1182         sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1183         if (sdp->sd_args.ar_statfs_quantum) {
1184                 sdp->sd_tune.gt_statfs_slow = 0;
1185                 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1186         } else {
1187                 sdp->sd_tune.gt_statfs_slow = 1;
1188                 sdp->sd_tune.gt_statfs_quantum = 30;
1189         }
1190
1191         error = init_names(sdp, silent);
1192         if (error)
1193                 goto fail_free;
1194
1195         snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1196
1197         sdp->sd_delete_wq = alloc_workqueue("gfs2-delete/%s",
1198                         WQ_MEM_RECLAIM | WQ_FREEZABLE, 0, sdp->sd_fsname);
1199         error = -ENOMEM;
1200         if (!sdp->sd_delete_wq)
1201                 goto fail_free;
1202
1203         error = gfs2_sys_fs_add(sdp);
1204         if (error)
1205                 goto fail_delete_wq;
1206
1207         gfs2_create_debugfs_file(sdp);
1208
1209         error = gfs2_lm_mount(sdp, silent);
1210         if (error)
1211                 goto fail_debug;
1212
1213         error = init_locking(sdp, &mount_gh, DO);
1214         if (error)
1215                 goto fail_lm;
1216
1217         error = init_sb(sdp, silent);
1218         if (error)
1219                 goto fail_locking;
1220
1221         /* Turn rgrplvb on by default if fs format is recent enough */
1222         if (!sdp->sd_args.ar_got_rgrplvb && sdp->sd_sb.sb_fs_format > 1801)
1223                 sdp->sd_args.ar_rgrplvb = 1;
1224
1225         error = wait_on_journal(sdp);
1226         if (error)
1227                 goto fail_sb;
1228
1229         /*
1230          * If user space has failed to join the cluster or some similar
1231          * failure has occurred, then the journal id will contain a
1232          * negative (error) number. This will then be returned to the
1233          * caller (of the mount syscall). We do this even for spectator
1234          * mounts (which just write a jid of 0 to indicate "ok" even though
1235          * the jid is unused in the spectator case)
1236          */
1237         if (sdp->sd_lockstruct.ls_jid < 0) {
1238                 error = sdp->sd_lockstruct.ls_jid;
1239                 sdp->sd_lockstruct.ls_jid = 0;
1240                 goto fail_sb;
1241         }
1242
1243         if (sdp->sd_args.ar_spectator)
1244                 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1245                          sdp->sd_table_name);
1246         else
1247                 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1248                          sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1249
1250         error = init_inodes(sdp, DO);
1251         if (error)
1252                 goto fail_sb;
1253
1254         error = init_per_node(sdp, DO);
1255         if (error)
1256                 goto fail_inodes;
1257
1258         error = gfs2_statfs_init(sdp);
1259         if (error) {
1260                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1261                 goto fail_per_node;
1262         }
1263
1264         if (!sb_rdonly(sb)) {
1265                 error = init_threads(sdp);
1266                 if (error) {
1267                         gfs2_withdraw_delayed(sdp);
1268                         goto fail_per_node;
1269                 }
1270         }
1271
1272         error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
1273         if (error)
1274                 goto fail_per_node;
1275
1276         if (!sb_rdonly(sb))
1277                 error = gfs2_make_fs_rw(sdp);
1278
1279         gfs2_freeze_unlock(&freeze_gh);
1280         if (error) {
1281                 if (sdp->sd_quotad_process)
1282                         kthread_stop(sdp->sd_quotad_process);
1283                 sdp->sd_quotad_process = NULL;
1284                 if (sdp->sd_logd_process)
1285                         kthread_stop(sdp->sd_logd_process);
1286                 sdp->sd_logd_process = NULL;
1287                 fs_err(sdp, "can't make FS RW: %d\n", error);
1288                 goto fail_per_node;
1289         }
1290         gfs2_glock_dq_uninit(&mount_gh);
1291         gfs2_online_uevent(sdp);
1292         return 0;
1293
1294 fail_per_node:
1295         init_per_node(sdp, UNDO);
1296 fail_inodes:
1297         init_inodes(sdp, UNDO);
1298 fail_sb:
1299         if (sdp->sd_root_dir)
1300                 dput(sdp->sd_root_dir);
1301         if (sdp->sd_master_dir)
1302                 dput(sdp->sd_master_dir);
1303         if (sb->s_root)
1304                 dput(sb->s_root);
1305         sb->s_root = NULL;
1306 fail_locking:
1307         init_locking(sdp, &mount_gh, UNDO);
1308 fail_lm:
1309         complete_all(&sdp->sd_journal_ready);
1310         gfs2_gl_hash_clear(sdp);
1311         gfs2_lm_unmount(sdp);
1312 fail_debug:
1313         gfs2_delete_debugfs_file(sdp);
1314         gfs2_sys_fs_del(sdp);
1315 fail_delete_wq:
1316         destroy_workqueue(sdp->sd_delete_wq);
1317 fail_free:
1318         free_sbd(sdp);
1319         sb->s_fs_info = NULL;
1320         return error;
1321 }
1322
1323 /**
1324  * gfs2_get_tree - Get the GFS2 superblock and root directory
1325  * @fc: The filesystem context
1326  *
1327  * Returns: 0 or -errno on error
1328  */
1329 static int gfs2_get_tree(struct fs_context *fc)
1330 {
1331         struct gfs2_args *args = fc->fs_private;
1332         struct gfs2_sbd *sdp;
1333         int error;
1334
1335         error = get_tree_bdev(fc, gfs2_fill_super);
1336         if (error)
1337                 return error;
1338
1339         sdp = fc->root->d_sb->s_fs_info;
1340         dput(fc->root);
1341         if (args->ar_meta)
1342                 fc->root = dget(sdp->sd_master_dir);
1343         else
1344                 fc->root = dget(sdp->sd_root_dir);
1345         return 0;
1346 }
1347
1348 static void gfs2_fc_free(struct fs_context *fc)
1349 {
1350         struct gfs2_args *args = fc->fs_private;
1351
1352         kfree(args);
1353 }
1354
1355 enum gfs2_param {
1356         Opt_lockproto,
1357         Opt_locktable,
1358         Opt_hostdata,
1359         Opt_spectator,
1360         Opt_ignore_local_fs,
1361         Opt_localflocks,
1362         Opt_localcaching,
1363         Opt_debug,
1364         Opt_upgrade,
1365         Opt_acl,
1366         Opt_quota,
1367         Opt_quota_flag,
1368         Opt_suiddir,
1369         Opt_data,
1370         Opt_meta,
1371         Opt_discard,
1372         Opt_commit,
1373         Opt_errors,
1374         Opt_statfs_quantum,
1375         Opt_statfs_percent,
1376         Opt_quota_quantum,
1377         Opt_barrier,
1378         Opt_rgrplvb,
1379         Opt_loccookie,
1380 };
1381
1382 static const struct constant_table gfs2_param_quota[] = {
1383         {"off",        GFS2_QUOTA_OFF},
1384         {"account",    GFS2_QUOTA_ACCOUNT},
1385         {"on",         GFS2_QUOTA_ON},
1386         {}
1387 };
1388
1389 enum opt_data {
1390         Opt_data_writeback = GFS2_DATA_WRITEBACK,
1391         Opt_data_ordered   = GFS2_DATA_ORDERED,
1392 };
1393
1394 static const struct constant_table gfs2_param_data[] = {
1395         {"writeback",  Opt_data_writeback },
1396         {"ordered",    Opt_data_ordered },
1397         {}
1398 };
1399
1400 enum opt_errors {
1401         Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1402         Opt_errors_panic    = GFS2_ERRORS_PANIC,
1403 };
1404
1405 static const struct constant_table gfs2_param_errors[] = {
1406         {"withdraw",   Opt_errors_withdraw },
1407         {"panic",      Opt_errors_panic },
1408         {}
1409 };
1410
1411 static const struct fs_parameter_spec gfs2_fs_parameters[] = {
1412         fsparam_string ("lockproto",          Opt_lockproto),
1413         fsparam_string ("locktable",          Opt_locktable),
1414         fsparam_string ("hostdata",           Opt_hostdata),
1415         fsparam_flag   ("spectator",          Opt_spectator),
1416         fsparam_flag   ("norecovery",         Opt_spectator),
1417         fsparam_flag   ("ignore_local_fs",    Opt_ignore_local_fs),
1418         fsparam_flag   ("localflocks",        Opt_localflocks),
1419         fsparam_flag   ("localcaching",       Opt_localcaching),
1420         fsparam_flag_no("debug",              Opt_debug),
1421         fsparam_flag   ("upgrade",            Opt_upgrade),
1422         fsparam_flag_no("acl",                Opt_acl),
1423         fsparam_flag_no("suiddir",            Opt_suiddir),
1424         fsparam_enum   ("data",               Opt_data, gfs2_param_data),
1425         fsparam_flag   ("meta",               Opt_meta),
1426         fsparam_flag_no("discard",            Opt_discard),
1427         fsparam_s32    ("commit",             Opt_commit),
1428         fsparam_enum   ("errors",             Opt_errors, gfs2_param_errors),
1429         fsparam_s32    ("statfs_quantum",     Opt_statfs_quantum),
1430         fsparam_s32    ("statfs_percent",     Opt_statfs_percent),
1431         fsparam_s32    ("quota_quantum",      Opt_quota_quantum),
1432         fsparam_flag_no("barrier",            Opt_barrier),
1433         fsparam_flag_no("rgrplvb",            Opt_rgrplvb),
1434         fsparam_flag_no("loccookie",          Opt_loccookie),
1435         /* quota can be a flag or an enum so it gets special treatment */
1436         fsparam_flag_no("quota",              Opt_quota_flag),
1437         fsparam_enum("quota",                 Opt_quota, gfs2_param_quota),
1438         {}
1439 };
1440
1441 /* Parse a single mount parameter */
1442 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1443 {
1444         struct gfs2_args *args = fc->fs_private;
1445         struct fs_parse_result result;
1446         int o;
1447
1448         o = fs_parse(fc, gfs2_fs_parameters, param, &result);
1449         if (o < 0)
1450                 return o;
1451
1452         switch (o) {
1453         case Opt_lockproto:
1454                 strscpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1455                 break;
1456         case Opt_locktable:
1457                 strscpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1458                 break;
1459         case Opt_hostdata:
1460                 strscpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1461                 break;
1462         case Opt_spectator:
1463                 args->ar_spectator = 1;
1464                 break;
1465         case Opt_ignore_local_fs:
1466                 /* Retained for backwards compat only */
1467                 break;
1468         case Opt_localflocks:
1469                 args->ar_localflocks = 1;
1470                 break;
1471         case Opt_localcaching:
1472                 /* Retained for backwards compat only */
1473                 break;
1474         case Opt_debug:
1475                 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1476                         return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1477                 args->ar_debug = result.boolean;
1478                 break;
1479         case Opt_upgrade:
1480                 /* Retained for backwards compat only */
1481                 break;
1482         case Opt_acl:
1483                 args->ar_posix_acl = result.boolean;
1484                 break;
1485         case Opt_quota_flag:
1486                 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON;
1487                 break;
1488         case Opt_quota:
1489                 args->ar_quota = result.int_32;
1490                 break;
1491         case Opt_suiddir:
1492                 args->ar_suiddir = result.boolean;
1493                 break;
1494         case Opt_data:
1495                 /* The uint_32 result maps directly to GFS2_DATA_* */
1496                 args->ar_data = result.uint_32;
1497                 break;
1498         case Opt_meta:
1499                 args->ar_meta = 1;
1500                 break;
1501         case Opt_discard:
1502                 args->ar_discard = result.boolean;
1503                 break;
1504         case Opt_commit:
1505                 if (result.int_32 <= 0)
1506                         return invalfc(fc, "commit mount option requires a positive numeric argument");
1507                 args->ar_commit = result.int_32;
1508                 break;
1509         case Opt_statfs_quantum:
1510                 if (result.int_32 < 0)
1511                         return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument");
1512                 args->ar_statfs_quantum = result.int_32;
1513                 break;
1514         case Opt_quota_quantum:
1515                 if (result.int_32 <= 0)
1516                         return invalfc(fc, "quota_quantum mount option requires a positive numeric argument");
1517                 args->ar_quota_quantum = result.int_32;
1518                 break;
1519         case Opt_statfs_percent:
1520                 if (result.int_32 < 0 || result.int_32 > 100)
1521                         return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100");
1522                 args->ar_statfs_percent = result.int_32;
1523                 break;
1524         case Opt_errors:
1525                 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1526                         return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1527                 args->ar_errors = result.uint_32;
1528                 break;
1529         case Opt_barrier:
1530                 args->ar_nobarrier = result.boolean;
1531                 break;
1532         case Opt_rgrplvb:
1533                 args->ar_rgrplvb = result.boolean;
1534                 args->ar_got_rgrplvb = 1;
1535                 break;
1536         case Opt_loccookie:
1537                 args->ar_loccookie = result.boolean;
1538                 break;
1539         default:
1540                 return invalfc(fc, "invalid mount option: %s", param->key);
1541         }
1542         return 0;
1543 }
1544
1545 static int gfs2_reconfigure(struct fs_context *fc)
1546 {
1547         struct super_block *sb = fc->root->d_sb;
1548         struct gfs2_sbd *sdp = sb->s_fs_info;
1549         struct gfs2_args *oldargs = &sdp->sd_args;
1550         struct gfs2_args *newargs = fc->fs_private;
1551         struct gfs2_tune *gt = &sdp->sd_tune;
1552         int error = 0;
1553
1554         sync_filesystem(sb);
1555
1556         spin_lock(&gt->gt_spin);
1557         oldargs->ar_commit = gt->gt_logd_secs;
1558         oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1559         if (gt->gt_statfs_slow)
1560                 oldargs->ar_statfs_quantum = 0;
1561         else
1562                 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1563         spin_unlock(&gt->gt_spin);
1564
1565         if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1566                 errorfc(fc, "reconfiguration of locking protocol not allowed");
1567                 return -EINVAL;
1568         }
1569         if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1570                 errorfc(fc, "reconfiguration of lock table not allowed");
1571                 return -EINVAL;
1572         }
1573         if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1574                 errorfc(fc, "reconfiguration of host data not allowed");
1575                 return -EINVAL;
1576         }
1577         if (newargs->ar_spectator != oldargs->ar_spectator) {
1578                 errorfc(fc, "reconfiguration of spectator mode not allowed");
1579                 return -EINVAL;
1580         }
1581         if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1582                 errorfc(fc, "reconfiguration of localflocks not allowed");
1583                 return -EINVAL;
1584         }
1585         if (newargs->ar_meta != oldargs->ar_meta) {
1586                 errorfc(fc, "switching between gfs2 and gfs2meta not allowed");
1587                 return -EINVAL;
1588         }
1589         if (oldargs->ar_spectator)
1590                 fc->sb_flags |= SB_RDONLY;
1591
1592         if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1593                 struct gfs2_holder freeze_gh;
1594
1595                 error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
1596                 if (error)
1597                         return -EINVAL;
1598
1599                 if (fc->sb_flags & SB_RDONLY) {
1600                         gfs2_make_fs_ro(sdp);
1601                 } else {
1602                         error = gfs2_make_fs_rw(sdp);
1603                         if (error)
1604                                 errorfc(fc, "unable to remount read-write");
1605                 }
1606                 gfs2_freeze_unlock(&freeze_gh);
1607         }
1608         sdp->sd_args = *newargs;
1609
1610         if (sdp->sd_args.ar_posix_acl)
1611                 sb->s_flags |= SB_POSIXACL;
1612         else
1613                 sb->s_flags &= ~SB_POSIXACL;
1614         if (sdp->sd_args.ar_nobarrier)
1615                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1616         else
1617                 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1618         spin_lock(&gt->gt_spin);
1619         gt->gt_logd_secs = newargs->ar_commit;
1620         gt->gt_quota_quantum = newargs->ar_quota_quantum;
1621         if (newargs->ar_statfs_quantum) {
1622                 gt->gt_statfs_slow = 0;
1623                 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1624         }
1625         else {
1626                 gt->gt_statfs_slow = 1;
1627                 gt->gt_statfs_quantum = 30;
1628         }
1629         spin_unlock(&gt->gt_spin);
1630
1631         gfs2_online_uevent(sdp);
1632         return error;
1633 }
1634
1635 static const struct fs_context_operations gfs2_context_ops = {
1636         .free        = gfs2_fc_free,
1637         .parse_param = gfs2_parse_param,
1638         .get_tree    = gfs2_get_tree,
1639         .reconfigure = gfs2_reconfigure,
1640 };
1641
1642 /* Set up the filesystem mount context */
1643 static int gfs2_init_fs_context(struct fs_context *fc)
1644 {
1645         struct gfs2_args *args;
1646
1647         args = kmalloc(sizeof(*args), GFP_KERNEL);
1648         if (args == NULL)
1649                 return -ENOMEM;
1650
1651         if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1652                 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1653
1654                 *args = sdp->sd_args;
1655         } else {
1656                 memset(args, 0, sizeof(*args));
1657                 args->ar_quota = GFS2_QUOTA_DEFAULT;
1658                 args->ar_data = GFS2_DATA_DEFAULT;
1659                 args->ar_commit = 30;
1660                 args->ar_statfs_quantum = 30;
1661                 args->ar_quota_quantum = 60;
1662                 args->ar_errors = GFS2_ERRORS_DEFAULT;
1663         }
1664         fc->fs_private = args;
1665         fc->ops = &gfs2_context_ops;
1666         return 0;
1667 }
1668
1669 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1670 {
1671         return -EINVAL;
1672 }
1673
1674 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1675 {
1676         return (fc->sget_key == s->s_bdev);
1677 }
1678
1679 static int gfs2_meta_get_tree(struct fs_context *fc)
1680 {
1681         struct super_block *s;
1682         struct gfs2_sbd *sdp;
1683         struct path path;
1684         int error;
1685
1686         if (!fc->source || !*fc->source)
1687                 return -EINVAL;
1688
1689         error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1690         if (error) {
1691                 pr_warn("path_lookup on %s returned error %d\n",
1692                         fc->source, error);
1693                 return error;
1694         }
1695         fc->fs_type = &gfs2_fs_type;
1696         fc->sget_key = path.dentry->d_sb->s_bdev;
1697         s = sget_fc(fc, test_meta_super, set_meta_super);
1698         path_put(&path);
1699         if (IS_ERR(s)) {
1700                 pr_warn("gfs2 mount does not exist\n");
1701                 return PTR_ERR(s);
1702         }
1703         if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1704                 deactivate_locked_super(s);
1705                 return -EBUSY;
1706         }
1707         sdp = s->s_fs_info;
1708         fc->root = dget(sdp->sd_master_dir);
1709         return 0;
1710 }
1711
1712 static const struct fs_context_operations gfs2_meta_context_ops = {
1713         .free        = gfs2_fc_free,
1714         .get_tree    = gfs2_meta_get_tree,
1715 };
1716
1717 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1718 {
1719         int ret = gfs2_init_fs_context(fc);
1720
1721         if (ret)
1722                 return ret;
1723
1724         fc->ops = &gfs2_meta_context_ops;
1725         return 0;
1726 }
1727
1728 /**
1729  * gfs2_evict_inodes - evict inodes cooperatively
1730  * @sb: the superblock
1731  *
1732  * When evicting an inode with a zero link count, we are trying to upgrade the
1733  * inode's iopen glock from SH to EX mode in order to determine if we can
1734  * delete the inode.  The other nodes are supposed to evict the inode from
1735  * their caches if they can, and to poke the inode's inode glock if they cannot
1736  * do so.  Either behavior allows gfs2_upgrade_iopen_glock() to proceed
1737  * quickly, but if the other nodes are not cooperating, the lock upgrading
1738  * attempt will time out.  Since inodes are evicted sequentially, this can add
1739  * up quickly.
1740  *
1741  * Function evict_inodes() tries to keep the s_inode_list_lock list locked over
1742  * a long time, which prevents other inodes from being evicted concurrently.
1743  * This precludes the cooperative behavior we are looking for.  This special
1744  * version of evict_inodes() avoids that.
1745  *
1746  * Modeled after drop_pagecache_sb().
1747  */
1748 static void gfs2_evict_inodes(struct super_block *sb)
1749 {
1750         struct inode *inode, *toput_inode = NULL;
1751         struct gfs2_sbd *sdp = sb->s_fs_info;
1752
1753         set_bit(SDF_EVICTING, &sdp->sd_flags);
1754
1755         spin_lock(&sb->s_inode_list_lock);
1756         list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
1757                 spin_lock(&inode->i_lock);
1758                 if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) &&
1759                     !need_resched()) {
1760                         spin_unlock(&inode->i_lock);
1761                         continue;
1762                 }
1763                 atomic_inc(&inode->i_count);
1764                 spin_unlock(&inode->i_lock);
1765                 spin_unlock(&sb->s_inode_list_lock);
1766
1767                 iput(toput_inode);
1768                 toput_inode = inode;
1769
1770                 cond_resched();
1771                 spin_lock(&sb->s_inode_list_lock);
1772         }
1773         spin_unlock(&sb->s_inode_list_lock);
1774         iput(toput_inode);
1775 }
1776
1777 static void gfs2_kill_sb(struct super_block *sb)
1778 {
1779         struct gfs2_sbd *sdp = sb->s_fs_info;
1780
1781         if (sdp == NULL) {
1782                 kill_block_super(sb);
1783                 return;
1784         }
1785
1786         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1787         dput(sdp->sd_root_dir);
1788         dput(sdp->sd_master_dir);
1789         sdp->sd_root_dir = NULL;
1790         sdp->sd_master_dir = NULL;
1791         shrink_dcache_sb(sb);
1792
1793         gfs2_evict_inodes(sb);
1794
1795         /*
1796          * Flush and then drain the delete workqueue here (via
1797          * destroy_workqueue()) to ensure that any delete work that
1798          * may be running will also see the SDF_DEACTIVATING flag.
1799          */
1800         set_bit(SDF_DEACTIVATING, &sdp->sd_flags);
1801         gfs2_flush_delete_work(sdp);
1802         destroy_workqueue(sdp->sd_delete_wq);
1803
1804         kill_block_super(sb);
1805 }
1806
1807 struct file_system_type gfs2_fs_type = {
1808         .name = "gfs2",
1809         .fs_flags = FS_REQUIRES_DEV,
1810         .init_fs_context = gfs2_init_fs_context,
1811         .parameters = gfs2_fs_parameters,
1812         .kill_sb = gfs2_kill_sb,
1813         .owner = THIS_MODULE,
1814 };
1815 MODULE_ALIAS_FS("gfs2");
1816
1817 struct file_system_type gfs2meta_fs_type = {
1818         .name = "gfs2meta",
1819         .fs_flags = FS_REQUIRES_DEV,
1820         .init_fs_context = gfs2_meta_init_fs_context,
1821         .owner = THIS_MODULE,
1822 };
1823 MODULE_ALIAS_FS("gfs2meta");