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         INIT_LIST_HEAD(&sdp->sd_trunc_list);
 110         spin_lock_init(&sdp->sd_trunc_lock);
 111         spin_lock_init(&sdp->sd_bitmap_lock);
 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         atomic_set(&sdp->sd_reserving_log, 0);
 138         init_waitqueue_head(&sdp->sd_reserving_log_wait);
 139         init_waitqueue_head(&sdp->sd_log_flush_wait);
 140         atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
 141         mutex_init(&sdp->sd_freeze_mutex);
 142
 143         return sdp;
 144
 145 fail:
 146         free_sbd(sdp);
 147         return NULL;
 148 }
 149
 150 /**
 151  * gfs2_check_sb - Check superblock
 152  * @sdp: the filesystem
 153  * @sb: The superblock
 154  * @silent: Don't print a message if the check fails
 155  *
 156  * Checks the version code of the FS is one that we understand how to
 157  * read and that the sizes of the various on-disk structures have not
 158  * changed.
 159  */
 160
 161 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
 162 {
 163         struct gfs2_sb_host *sb = &sdp->sd_sb;
 164
 165         if (sb->sb_magic != GFS2_MAGIC ||
 166             sb->sb_type != GFS2_METATYPE_SB) {
 167                 if (!silent)
 168                         pr_warn("not a GFS2 filesystem\n");
 169                 return -EINVAL;
 170         }
 171
 172         if (sb->sb_fs_format != GFS2_FORMAT_FS ||
 173             sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
 174                 fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
 175                 return -EINVAL;
 176         }
 177
 178         if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE ||
 179             (sb->sb_bsize & (sb->sb_bsize - 1))) {
 180                 pr_warn("Invalid superblock size\n");
 181                 return -EINVAL;
 182         }
 183         if (sb->sb_bsize_shift != ffs(sb->sb_bsize) - 1) {
 184                 pr_warn("Invalid block size shift\n");
 185                 return -EINVAL;
 186         }
 187         return 0;
 188 }
 189
 190 static void end_bio_io_page(struct bio *bio)
 191 {
 192         struct page *page = bio->bi_private;
 193
 194         if (!bio->bi_status)
 195                 SetPageUptodate(page);
 196         else
 197                 pr_warn("error %d reading superblock\n", bio->bi_status);
 198         unlock_page(page);
 199 }
 200
 201 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
 202 {
 203         struct gfs2_sb_host *sb = &sdp->sd_sb;
 204         struct super_block *s = sdp->sd_vfs;
 205         const struct gfs2_sb *str = buf;
 206
 207         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
 208         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
 209         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
 210         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
 211         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
 212         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
 213         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
 214         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
 215         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
 216         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
 217         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
 218
 219         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
 220         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
 221         memcpy(&s->s_uuid, str->sb_uuid, 16);
 222 }
 223
 224 /**
 225  * gfs2_read_super - Read the gfs2 super block from disk
 226  * @sdp: The GFS2 super block
 227  * @sector: The location of the super block
 228  * @error: The error code to return
 229  *
 230  * This uses the bio functions to read the super block from disk
 231  * because we want to be 100% sure that we never read cached data.
 232  * A super block is read twice only during each GFS2 mount and is
 233  * never written to by the filesystem. The first time its read no
 234  * locks are held, and the only details which are looked at are those
 235  * relating to the locking protocol. Once locking is up and working,
 236  * the sb is read again under the lock to establish the location of
 237  * the master directory (contains pointers to journals etc) and the
 238  * root directory.
 239  *
 240  * Returns: 0 on success or error
 241  */
 242
 243 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
 244 {
 245         struct super_block *sb = sdp->sd_vfs;
 246         struct gfs2_sb *p;
 247         struct page *page;
 248         struct bio *bio;
 249
 250         page = alloc_page(GFP_NOFS);
 251         if (unlikely(!page))
 252                 return -ENOMEM;
 253
 254         ClearPageUptodate(page);
 255         ClearPageDirty(page);
 256         lock_page(page);
 257
 258         bio = bio_alloc(GFP_NOFS, 1);
 259         bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
 260         bio_set_dev(bio, sb->s_bdev);
 261         bio_add_page(bio, page, PAGE_SIZE, 0);
 262
 263         bio->bi_end_io = end_bio_io_page;
 264         bio->bi_private = page;
 265         bio_set_op_attrs(bio, REQ_OP_READ, REQ_META);
 266         submit_bio(bio);
 267         wait_on_page_locked(page);
 268         bio_put(bio);
 269         if (!PageUptodate(page)) {
 270                 __free_page(page);
 271                 return -EIO;
 272         }
 273         p = kmap(page);
 274         gfs2_sb_in(sdp, p);
 275         kunmap(page);
 276         __free_page(page);
 277         return gfs2_check_sb(sdp, silent);
 278 }
 279
 280 /**
 281  * gfs2_read_sb - Read super block
 282  * @sdp: The GFS2 superblock
 283  * @silent: Don't print message if mount fails
 284  *
 285  */
 286
 287 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
 288 {
 289         u32 hash_blocks, ind_blocks, leaf_blocks;
 290         u32 tmp_blocks;
 291         unsigned int x;
 292         int error;
 293
 294         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 295         if (error) {
 296                 if (!silent)
 297                         fs_err(sdp, "can't read superblock\n");
 298                 return error;
 299         }
 300
 301         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 302                                GFS2_BASIC_BLOCK_SHIFT;
 303         sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
 304         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 305                           sizeof(struct gfs2_dinode)) / sizeof(u64);
 306         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 307                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
 308         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 309         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 310         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 311         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 312         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 313                                 sizeof(struct gfs2_meta_header)) /
 314                                 sizeof(struct gfs2_quota_change);
 315         sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
 316                                      sizeof(struct gfs2_meta_header))
 317                 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
 318
 319         /* Compute maximum reservation required to add a entry to a directory */
 320
 321         hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
 322                              sdp->sd_jbsize);
 323
 324         ind_blocks = 0;
 325         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
 326                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
 327                 ind_blocks += tmp_blocks;
 328         }
 329
 330         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
 331
 332         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
 333
 334         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
 335                                 sizeof(struct gfs2_dinode);
 336         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
 337         for (x = 2;; x++) {
 338                 u64 space, d;
 339                 u32 m;
 340
 341                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
 342                 d = space;
 343                 m = do_div(d, sdp->sd_inptrs);
 344
 345                 if (d != sdp->sd_heightsize[x - 1] || m)
 346                         break;
 347                 sdp->sd_heightsize[x] = space;
 348         }
 349         sdp->sd_max_height = x;
 350         sdp->sd_heightsize[x] = ~0;
 351         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
 352
 353         sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
 354                                       sizeof(struct gfs2_leaf)) /
 355                                      GFS2_MIN_DIRENT_SIZE;
 356         return 0;
 357 }
 358
 359 static int init_names(struct gfs2_sbd *sdp, int silent)
 360 {
 361         char *proto, *table;
 362         int error = 0;
 363
 364         proto = sdp->sd_args.ar_lockproto;
 365         table = sdp->sd_args.ar_locktable;
 366
 367         /*  Try to autodetect  */
 368
 369         if (!proto[0] || !table[0]) {
 370                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 371                 if (error)
 372                         return error;
 373
 374                 if (!proto[0])
 375                         proto = sdp->sd_sb.sb_lockproto;
 376                 if (!table[0])
 377                         table = sdp->sd_sb.sb_locktable;
 378         }
 379
 380         if (!table[0])
 381                 table = sdp->sd_vfs->s_id;
 382
 383         BUILD_BUG_ON(GFS2_LOCKNAME_LEN > GFS2_FSNAME_LEN);
 384
 385         strscpy(sdp->sd_proto_name, proto, GFS2_LOCKNAME_LEN);
 386         strscpy(sdp->sd_table_name, table, GFS2_LOCKNAME_LEN);
 387
 388         table = sdp->sd_table_name;
 389         while ((table = strchr(table, '/')))
 390                 *table = '_';
 391
 392         return error;
 393 }
 394
 395 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 396                         int undo)
 397 {
 398         int error = 0;
 399
 400         if (undo)
 401                 goto fail_trans;
 402
 403         error = gfs2_glock_nq_num(sdp,
 404                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 405                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 406                                   mount_gh);
 407         if (error) {
 408                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 409                 goto fail;
 410         }
 411
 412         error = gfs2_glock_nq_num(sdp,
 413                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 414                                   LM_ST_SHARED,
 415                                   LM_FLAG_NOEXP | GL_EXACT,
 416                                   &sdp->sd_live_gh);
 417         if (error) {
 418                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 419                 goto fail_mount;
 420         }
 421
 422         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 423                                CREATE, &sdp->sd_rename_gl);
 424         if (error) {
 425                 fs_err(sdp, "can't create rename glock: %d\n", error);
 426                 goto fail_live;
 427         }
 428
 429         error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
 430                                CREATE, &sdp->sd_freeze_gl);
 431         if (error) {
 432                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 433                 goto fail_rename;
 434         }
 435
 436         return 0;
 437
 438 fail_trans:
 439         gfs2_glock_put(sdp->sd_freeze_gl);
 440 fail_rename:
 441         gfs2_glock_put(sdp->sd_rename_gl);
 442 fail_live:
 443         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 444 fail_mount:
 445         gfs2_glock_dq_uninit(mount_gh);
 446 fail:
 447         return error;
 448 }
 449
 450 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
 451                             u64 no_addr, const char *name)
 452 {
 453         struct gfs2_sbd *sdp = sb->s_fs_info;
 454         struct dentry *dentry;
 455         struct inode *inode;
 456
 457         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
 458                                   GFS2_BLKST_FREE /* ignore */);
 459         if (IS_ERR(inode)) {
 460                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
 461                 return PTR_ERR(inode);
 462         }
 463         dentry = d_make_root(inode);
 464         if (!dentry) {
 465                 fs_err(sdp, "can't alloc %s dentry\n", name);
 466                 return -ENOMEM;
 467         }
 468         *dptr = dentry;
 469         return 0;
 470 }
 471
 472 static int init_sb(struct gfs2_sbd *sdp, int silent)
 473 {
 474         struct super_block *sb = sdp->sd_vfs;
 475         struct gfs2_holder sb_gh;
 476         u64 no_addr;
 477         int ret;
 478
 479         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 480                                 LM_ST_SHARED, 0, &sb_gh);
 481         if (ret) {
 482                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
 483                 return ret;
 484         }
 485
 486         ret = gfs2_read_sb(sdp, silent);
 487         if (ret) {
 488                 fs_err(sdp, "can't read superblock: %d\n", ret);
 489                 goto out;
 490         }
 491
 492         /* Set up the buffer cache and SB for real */
 493         if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
 494                 ret = -EINVAL;
 495                 fs_err(sdp, "FS block size (%u) is too small for device "
 496                        "block size (%u)\n",
 497                        sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
 498                 goto out;
 499         }
 500         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 501                 ret = -EINVAL;
 502                 fs_err(sdp, "FS block size (%u) is too big for machine "
 503                        "page size (%u)\n",
 504                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 505                 goto out;
 506         }
 507         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 508
 509         /* Get the root inode */
 510         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 511         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 512         if (ret)
 513                 goto out;
 514
 515         /* Get the master inode */
 516         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 517         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 518         if (ret) {
 519                 dput(sdp->sd_root_dir);
 520                 goto out;
 521         }
 522         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 523 out:
 524         gfs2_glock_dq_uninit(&sb_gh);
 525         return ret;
 526 }
 527
 528 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
 529 {
 530         char *message = "FIRSTMOUNT=Done";
 531         char *envp[] = { message, NULL };
 532
 533         fs_info(sdp, "first mount done, others may mount\n");
 534
 535         if (sdp->sd_lockstruct.ls_ops->lm_first_done)
 536                 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
 537
 538         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
 539 }
 540
 541 /**
 542  * gfs2_jindex_hold - Grab a lock on the jindex
 543  * @sdp: The GFS2 superblock
 544  * @ji_gh: the holder for the jindex glock
 545  *
 546  * Returns: errno
 547  */
 548
 549 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 550 {
 551         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
 552         struct qstr name;
 553         char buf[20];
 554         struct gfs2_jdesc *jd;
 555         int error;
 556
 557         name.name = buf;
 558
 559         mutex_lock(&sdp->sd_jindex_mutex);
 560
 561         for (;;) {
 562                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
 563                 if (error)
 564                         break;
 565
 566                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
 567                 name.hash = gfs2_disk_hash(name.name, name.len);
 568
 569                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
 570                 if (error == -ENOENT) {
 571                         error = 0;
 572                         break;
 573                 }
 574
 575                 gfs2_glock_dq_uninit(ji_gh);
 576
 577                 if (error)
 578                         break;
 579
 580                 error = -ENOMEM;
 581                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
 582                 if (!jd)
 583                         break;
 584
 585                 INIT_LIST_HEAD(&jd->extent_list);
 586                 INIT_LIST_HEAD(&jd->jd_revoke_list);
 587
 588                 INIT_WORK(&jd->jd_work, gfs2_recover_func);
 589                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
 590                 if (IS_ERR_OR_NULL(jd->jd_inode)) {
 591                         if (!jd->jd_inode)
 592                                 error = -ENOENT;
 593                         else
 594                                 error = PTR_ERR(jd->jd_inode);
 595                         kfree(jd);
 596                         break;
 597                 }
 598
 599                 spin_lock(&sdp->sd_jindex_spin);
 600                 jd->jd_jid = sdp->sd_journals++;
 601                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
 602                 spin_unlock(&sdp->sd_jindex_spin);
 603         }
 604
 605         mutex_unlock(&sdp->sd_jindex_mutex);
 606
 607         return error;
 608 }
 609
 610 /**
 611  * check_journal_clean - Make sure a journal is clean for a spectator mount
 612  * @sdp: The GFS2 superblock
 613  * @jd: The journal descriptor
 614  *
 615  * Returns: 0 if the journal is clean or locked, else an error
 616  */
 617 static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd)
 618 {
 619         int error;
 620         struct gfs2_holder j_gh;
 621         struct gfs2_log_header_host head;
 622         struct gfs2_inode *ip;
 623
 624         ip = GFS2_I(jd->jd_inode);
 625         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP |
 626                                    GL_EXACT | GL_NOCACHE, &j_gh);
 627         if (error) {
 628                 fs_err(sdp, "Error locking journal for spectator mount.\n");
 629                 return -EPERM;
 630         }
 631         error = gfs2_jdesc_check(jd);
 632         if (error) {
 633                 fs_err(sdp, "Error checking journal for spectator mount.\n");
 634                 goto out_unlock;
 635         }
 636         error = gfs2_find_jhead(jd, &head, false);
 637         if (error) {
 638                 fs_err(sdp, "Error parsing journal for spectator mount.\n");
 639                 goto out_unlock;
 640         }
 641         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 642                 error = -EPERM;
 643                 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter "
 644                        "must not be a spectator.\n", jd->jd_jid);
 645         }
 646
 647 out_unlock:
 648         gfs2_glock_dq_uninit(&j_gh);
 649         return error;
 650 }
 651
 652 static int init_journal(struct gfs2_sbd *sdp, int undo)
 653 {
 654         struct inode *master = d_inode(sdp->sd_master_dir);
 655         struct gfs2_holder ji_gh;
 656         struct gfs2_inode *ip;
 657         int jindex = 1;
 658         int error = 0;
 659
 660         if (undo) {
 661                 jindex = 0;
 662                 goto fail_jinode_gh;
 663         }
 664
 665         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
 666         if (IS_ERR(sdp->sd_jindex)) {
 667                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 668                 return PTR_ERR(sdp->sd_jindex);
 669         }
 670
 671         /* Load in the journal index special file */
 672
 673         error = gfs2_jindex_hold(sdp, &ji_gh);
 674         if (error) {
 675                 fs_err(sdp, "can't read journal index: %d\n", error);
 676                 goto fail;
 677         }
 678
 679         error = -EUSERS;
 680         if (!gfs2_jindex_size(sdp)) {
 681                 fs_err(sdp, "no journals!\n");
 682                 goto fail_jindex;
 683         }
 684
 685         atomic_set(&sdp->sd_log_blks_needed, 0);
 686         if (sdp->sd_args.ar_spectator) {
 687                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 688                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 689                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 690                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 691         } else {
 692                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 693                         fs_err(sdp, "can't mount journal #%u\n",
 694                                sdp->sd_lockstruct.ls_jid);
 695                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 696                                gfs2_jindex_size(sdp),
 697                                gfs2_jindex_size(sdp) - 1);
 698                         goto fail_jindex;
 699                 }
 700                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 701
 702                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 703                                           &gfs2_journal_glops,
 704                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 705                                           &sdp->sd_journal_gh);
 706                 if (error) {
 707                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 708                         goto fail_jindex;
 709                 }
 710
 711                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 712                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 713                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 714                                            &sdp->sd_jinode_gh);
 715                 if (error) {
 716                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 717                                error);
 718                         goto fail_journal_gh;
 719                 }
 720
 721                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 722                 if (error) {
 723                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 724                                sdp->sd_jdesc->jd_jid, error);
 725                         goto fail_jinode_gh;
 726                 }
 727                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 728                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 729                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 730
 731                 /* Map the extents for this journal's blocks */
 732                 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
 733         }
 734         trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
 735
 736         if (sdp->sd_lockstruct.ls_first) {
 737                 unsigned int x;
 738                 for (x = 0; x < sdp->sd_journals; x++) {
 739                         struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
 740
 741                         if (sdp->sd_args.ar_spectator) {
 742                                 error = check_journal_clean(sdp, jd);
 743                                 if (error)
 744                                         goto fail_jinode_gh;
 745                                 continue;
 746                         }
 747                         error = gfs2_recover_journal(jd, true);
 748                         if (error) {
 749                                 fs_err(sdp, "error recovering journal %u: %d\n",
 750                                        x, error);
 751                                 goto fail_jinode_gh;
 752                         }
 753                 }
 754
 755                 gfs2_others_may_mount(sdp);
 756         } else if (!sdp->sd_args.ar_spectator) {
 757                 error = gfs2_recover_journal(sdp->sd_jdesc, true);
 758                 if (error) {
 759                         fs_err(sdp, "error recovering my journal: %d\n", error);
 760                         goto fail_jinode_gh;
 761                 }
 762         }
 763
 764         sdp->sd_log_idle = 1;
 765         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 766         gfs2_glock_dq_uninit(&ji_gh);
 767         jindex = 0;
 768         INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
 769         return 0;
 770
 771 fail_jinode_gh:
 772         if (!sdp->sd_args.ar_spectator)
 773                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 774 fail_journal_gh:
 775         if (!sdp->sd_args.ar_spectator)
 776                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 777 fail_jindex:
 778         gfs2_jindex_free(sdp);
 779         if (jindex)
 780                 gfs2_glock_dq_uninit(&ji_gh);
 781 fail:
 782         iput(sdp->sd_jindex);
 783         return error;
 784 }
 785
 786 static struct lock_class_key gfs2_quota_imutex_key;
 787
 788 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 789 {
 790         int error = 0;
 791         struct inode *master = d_inode(sdp->sd_master_dir);
 792
 793         if (undo)
 794                 goto fail_qinode;
 795
 796         error = init_journal(sdp, undo);
 797         complete_all(&sdp->sd_journal_ready);
 798         if (error)
 799                 goto fail;
 800
 801         /* Read in the master statfs inode */
 802         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 803         if (IS_ERR(sdp->sd_statfs_inode)) {
 804                 error = PTR_ERR(sdp->sd_statfs_inode);
 805                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 806                 goto fail_journal;
 807         }
 808
 809         /* Read in the resource index inode */
 810         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 811         if (IS_ERR(sdp->sd_rindex)) {
 812                 error = PTR_ERR(sdp->sd_rindex);
 813                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 814                 goto fail_statfs;
 815         }
 816         sdp->sd_rindex_uptodate = 0;
 817
 818         /* Read in the quota inode */
 819         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 820         if (IS_ERR(sdp->sd_quota_inode)) {
 821                 error = PTR_ERR(sdp->sd_quota_inode);
 822                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 823                 goto fail_rindex;
 824         }
 825         /*
 826          * i_rwsem on quota files is special. Since this inode is hidden system
 827          * file, we are safe to define locking ourselves.
 828          */
 829         lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
 830                           &gfs2_quota_imutex_key);
 831
 832         error = gfs2_rindex_update(sdp);
 833         if (error)
 834                 goto fail_qinode;
 835
 836         return 0;
 837
 838 fail_qinode:
 839         iput(sdp->sd_quota_inode);
 840 fail_rindex:
 841         gfs2_clear_rgrpd(sdp);
 842         iput(sdp->sd_rindex);
 843 fail_statfs:
 844         iput(sdp->sd_statfs_inode);
 845 fail_journal:
 846         init_journal(sdp, UNDO);
 847 fail:
 848         return error;
 849 }
 850
 851 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 852 {
 853         struct inode *pn = NULL;
 854         char buf[30];
 855         int error = 0;
 856         struct gfs2_inode *ip;
 857         struct inode *master = d_inode(sdp->sd_master_dir);
 858
 859         if (sdp->sd_args.ar_spectator)
 860                 return 0;
 861
 862         if (undo)
 863                 goto fail_qc_gh;
 864
 865         pn = gfs2_lookup_simple(master, "per_node");
 866         if (IS_ERR(pn)) {
 867                 error = PTR_ERR(pn);
 868                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 869                 return error;
 870         }
 871
 872         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 873         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 874         if (IS_ERR(sdp->sd_sc_inode)) {
 875                 error = PTR_ERR(sdp->sd_sc_inode);
 876                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 877                 goto fail;
 878         }
 879
 880         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 881         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 882         if (IS_ERR(sdp->sd_qc_inode)) {
 883                 error = PTR_ERR(sdp->sd_qc_inode);
 884                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 885                 goto fail_ut_i;
 886         }
 887
 888         iput(pn);
 889         pn = NULL;
 890
 891         ip = GFS2_I(sdp->sd_sc_inode);
 892         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 893                                    &sdp->sd_sc_gh);
 894         if (error) {
 895                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 896                 goto fail_qc_i;
 897         }
 898
 899         ip = GFS2_I(sdp->sd_qc_inode);
 900         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 901                                    &sdp->sd_qc_gh);
 902         if (error) {
 903                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 904                 goto fail_ut_gh;
 905         }
 906
 907         return 0;
 908
 909 fail_qc_gh:
 910         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 911 fail_ut_gh:
 912         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 913 fail_qc_i:
 914         iput(sdp->sd_qc_inode);
 915 fail_ut_i:
 916         iput(sdp->sd_sc_inode);
 917 fail:
 918         iput(pn);
 919         return error;
 920 }
 921
 922 static const match_table_t nolock_tokens = {
 923         { Opt_jid, "jid=%d", },
 924         { Opt_err, NULL },
 925 };
 926
 927 static const struct lm_lockops nolock_ops = {
 928         .lm_proto_name = "lock_nolock",
 929         .lm_put_lock = gfs2_glock_free,
 930         .lm_tokens = &nolock_tokens,
 931 };
 932
 933 /**
 934  * gfs2_lm_mount - mount a locking protocol
 935  * @sdp: the filesystem
 936  * @args: mount arguments
 937  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
 938  *
 939  * Returns: errno
 940  */
 941
 942 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
 943 {
 944         const struct lm_lockops *lm;
 945         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 946         struct gfs2_args *args = &sdp->sd_args;
 947         const char *proto = sdp->sd_proto_name;
 948         const char *table = sdp->sd_table_name;
 949         char *o, *options;
 950         int ret;
 951
 952         if (!strcmp("lock_nolock", proto)) {
 953                 lm = &nolock_ops;
 954                 sdp->sd_args.ar_localflocks = 1;
 955 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
 956         } else if (!strcmp("lock_dlm", proto)) {
 957                 lm = &gfs2_dlm_ops;
 958 #endif
 959         } else {
 960                 pr_info("can't find protocol %s\n", proto);
 961                 return -ENOENT;
 962         }
 963
 964         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
 965
 966         ls->ls_ops = lm;
 967         ls->ls_first = 1;
 968
 969         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
 970                 substring_t tmp[MAX_OPT_ARGS];
 971                 int token, option;
 972
 973                 if (!o || !*o)
 974                         continue;
 975
 976                 token = match_token(o, *lm->lm_tokens, tmp);
 977                 switch (token) {
 978                 case Opt_jid:
 979                         ret = match_int(&tmp[0], &option);
 980                         if (ret || option < 0)
 981                                 goto hostdata_error;
 982                         if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
 983                                 ls->ls_jid = option;
 984                         break;
 985                 case Opt_id:
 986                 case Opt_nodir:
 987                         /* Obsolete, but left for backward compat purposes */
 988                         break;
 989                 case Opt_first:
 990                         ret = match_int(&tmp[0], &option);
 991                         if (ret || (option != 0 && option != 1))
 992                                 goto hostdata_error;
 993                         ls->ls_first = option;
 994                         break;
 995                 case Opt_err:
 996                 default:
 997 hostdata_error:
 998                         fs_info(sdp, "unknown hostdata (%s)\n", o);
 999                         return -EINVAL;
1000                 }
1001         }
1002
1003         if (lm->lm_mount == NULL) {
1004                 fs_info(sdp, "Now mounting FS...\n");
1005                 complete_all(&sdp->sd_locking_init);
1006                 return 0;
1007         }
1008         ret = lm->lm_mount(sdp, table);
1009         if (ret == 0)
1010                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1011         complete_all(&sdp->sd_locking_init);
1012         return ret;
1013 }
1014
1015 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1016 {
1017         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1018         if (likely(!test_bit(SDF_WITHDRAWN, &sdp->sd_flags)) &&
1019             lm->lm_unmount)
1020                 lm->lm_unmount(sdp);
1021 }
1022
1023 static int wait_on_journal(struct gfs2_sbd *sdp)
1024 {
1025         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1026                 return 0;
1027
1028         return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1029                 ? -EINTR : 0;
1030 }
1031
1032 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1033 {
1034         struct super_block *sb = sdp->sd_vfs;
1035         char ro[20];
1036         char spectator[20];
1037         char *envp[] = { ro, spectator, NULL };
1038         sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1039         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1040         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1041 }
1042
1043 /**
1044  * gfs2_fill_super - Read in superblock
1045  * @sb: The VFS superblock
1046  * @args: Mount options
1047  * @silent: Don't complain if it's not a GFS2 filesystem
1048  *
1049  * Returns: -errno
1050  */
1051 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1052 {
1053         struct gfs2_args *args = fc->fs_private;
1054         int silent = fc->sb_flags & SB_SILENT;
1055         struct gfs2_sbd *sdp;
1056         struct gfs2_holder mount_gh;
1057         int error;
1058
1059         sdp = init_sbd(sb);
1060         if (!sdp) {
1061                 pr_warn("can't alloc struct gfs2_sbd\n");
1062                 return -ENOMEM;
1063         }
1064         sdp->sd_args = *args;
1065
1066         if (sdp->sd_args.ar_spectator) {
1067                 sb->s_flags |= SB_RDONLY;
1068                 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1069         }
1070         if (sdp->sd_args.ar_posix_acl)
1071                 sb->s_flags |= SB_POSIXACL;
1072         if (sdp->sd_args.ar_nobarrier)
1073                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1074
1075         sb->s_flags |= SB_NOSEC;
1076         sb->s_magic = GFS2_MAGIC;
1077         sb->s_op = &gfs2_super_ops;
1078         sb->s_d_op = &gfs2_dops;
1079         sb->s_export_op = &gfs2_export_ops;
1080         sb->s_xattr = gfs2_xattr_handlers;
1081         sb->s_qcop = &gfs2_quotactl_ops;
1082         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1083         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1084         sb->s_time_gran = 1;
1085         sb->s_maxbytes = MAX_LFS_FILESIZE;
1086
1087         /* Set up the buffer cache and fill in some fake block size values
1088            to allow us to read-in the on-disk superblock. */
1089         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1090         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1091         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1092                                GFS2_BASIC_BLOCK_SHIFT;
1093         sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1094
1095         sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1096         sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1097         if (sdp->sd_args.ar_statfs_quantum) {
1098                 sdp->sd_tune.gt_statfs_slow = 0;
1099                 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1100         } else {
1101                 sdp->sd_tune.gt_statfs_slow = 1;
1102                 sdp->sd_tune.gt_statfs_quantum = 30;
1103         }
1104
1105         error = init_names(sdp, silent);
1106         if (error)
1107                 goto fail_free;
1108
1109         snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1110
1111         error = gfs2_sys_fs_add(sdp);
1112         if (error)
1113                 goto fail_free;
1114
1115         gfs2_create_debugfs_file(sdp);
1116
1117         error = gfs2_lm_mount(sdp, silent);
1118         if (error)
1119                 goto fail_debug;
1120
1121         error = init_locking(sdp, &mount_gh, DO);
1122         if (error)
1123                 goto fail_lm;
1124
1125         error = init_sb(sdp, silent);
1126         if (error)
1127                 goto fail_locking;
1128
1129         error = wait_on_journal(sdp);
1130         if (error)
1131                 goto fail_sb;
1132
1133         /*
1134          * If user space has failed to join the cluster or some similar
1135          * failure has occurred, then the journal id will contain a
1136          * negative (error) number. This will then be returned to the
1137          * caller (of the mount syscall). We do this even for spectator
1138          * mounts (which just write a jid of 0 to indicate "ok" even though
1139          * the jid is unused in the spectator case)
1140          */
1141         if (sdp->sd_lockstruct.ls_jid < 0) {
1142                 error = sdp->sd_lockstruct.ls_jid;
1143                 sdp->sd_lockstruct.ls_jid = 0;
1144                 goto fail_sb;
1145         }
1146
1147         if (sdp->sd_args.ar_spectator)
1148                 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1149                          sdp->sd_table_name);
1150         else
1151                 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1152                          sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1153
1154         error = init_inodes(sdp, DO);
1155         if (error)
1156                 goto fail_sb;
1157
1158         error = init_per_node(sdp, DO);
1159         if (error)
1160                 goto fail_inodes;
1161
1162         error = gfs2_statfs_init(sdp);
1163         if (error) {
1164                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1165                 goto fail_per_node;
1166         }
1167
1168         if (sb_rdonly(sb)) {
1169                 struct gfs2_holder freeze_gh;
1170
1171                 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED,
1172                                            GL_EXACT, &freeze_gh);
1173                 if (error) {
1174                         fs_err(sdp, "can't make FS RO: %d\n", error);
1175                         goto fail_per_node;
1176                 }
1177                 gfs2_glock_dq_uninit(&freeze_gh);
1178         } else {
1179                 error = gfs2_make_fs_rw(sdp);
1180                 if (error) {
1181                         fs_err(sdp, "can't make FS RW: %d\n", error);
1182                         goto fail_per_node;
1183                 }
1184         }
1185
1186         gfs2_glock_dq_uninit(&mount_gh);
1187         gfs2_online_uevent(sdp);
1188         return 0;
1189
1190 fail_per_node:
1191         init_per_node(sdp, UNDO);
1192 fail_inodes:
1193         init_inodes(sdp, UNDO);
1194 fail_sb:
1195         if (sdp->sd_root_dir)
1196                 dput(sdp->sd_root_dir);
1197         if (sdp->sd_master_dir)
1198                 dput(sdp->sd_master_dir);
1199         if (sb->s_root)
1200                 dput(sb->s_root);
1201         sb->s_root = NULL;
1202 fail_locking:
1203         init_locking(sdp, &mount_gh, UNDO);
1204 fail_lm:
1205         complete_all(&sdp->sd_journal_ready);
1206         gfs2_gl_hash_clear(sdp);
1207         gfs2_lm_unmount(sdp);
1208 fail_debug:
1209         gfs2_delete_debugfs_file(sdp);
1210         gfs2_sys_fs_del(sdp);
1211 fail_free:
1212         free_sbd(sdp);
1213         sb->s_fs_info = NULL;
1214         return error;
1215 }
1216
1217 /**
1218  * gfs2_get_tree - Get the GFS2 superblock and root directory
1219  * @fc: The filesystem context
1220  *
1221  * Returns: 0 or -errno on error
1222  */
1223 static int gfs2_get_tree(struct fs_context *fc)
1224 {
1225         struct gfs2_args *args = fc->fs_private;
1226         struct gfs2_sbd *sdp;
1227         int error;
1228
1229         error = get_tree_bdev(fc, gfs2_fill_super);
1230         if (error)
1231                 return error;
1232
1233         sdp = fc->root->d_sb->s_fs_info;
1234         dput(fc->root);
1235         if (args->ar_meta)
1236                 fc->root = dget(sdp->sd_master_dir);
1237         else
1238                 fc->root = dget(sdp->sd_root_dir);
1239         return 0;
1240 }
1241
1242 static void gfs2_fc_free(struct fs_context *fc)
1243 {
1244         struct gfs2_args *args = fc->fs_private;
1245
1246         kfree(args);
1247 }
1248
1249 enum gfs2_param {
1250         Opt_lockproto,
1251         Opt_locktable,
1252         Opt_hostdata,
1253         Opt_spectator,
1254         Opt_ignore_local_fs,
1255         Opt_localflocks,
1256         Opt_localcaching,
1257         Opt_debug,
1258         Opt_upgrade,
1259         Opt_acl,
1260         Opt_quota,
1261         Opt_suiddir,
1262         Opt_data,
1263         Opt_meta,
1264         Opt_discard,
1265         Opt_commit,
1266         Opt_errors,
1267         Opt_statfs_quantum,
1268         Opt_statfs_percent,
1269         Opt_quota_quantum,
1270         Opt_barrier,
1271         Opt_rgrplvb,
1272         Opt_loccookie,
1273 };
1274
1275 enum opt_quota {
1276         Opt_quota_unset = 0,
1277         Opt_quota_off,
1278         Opt_quota_account,
1279         Opt_quota_on,
1280 };
1281
1282 static const unsigned int opt_quota_values[] = {
1283         [Opt_quota_off]     = GFS2_QUOTA_OFF,
1284         [Opt_quota_account] = GFS2_QUOTA_ACCOUNT,
1285         [Opt_quota_on]      = GFS2_QUOTA_ON,
1286 };
1287
1288 enum opt_data {
1289         Opt_data_writeback = GFS2_DATA_WRITEBACK,
1290         Opt_data_ordered   = GFS2_DATA_ORDERED,
1291 };
1292
1293 enum opt_errors {
1294         Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1295         Opt_errors_panic    = GFS2_ERRORS_PANIC,
1296 };
1297
1298 static const struct fs_parameter_spec gfs2_param_specs[] = {
1299         fsparam_string ("lockproto",          Opt_lockproto),
1300         fsparam_string ("locktable",          Opt_locktable),
1301         fsparam_string ("hostdata",           Opt_hostdata),
1302         fsparam_flag   ("spectator",          Opt_spectator),
1303         fsparam_flag   ("norecovery",         Opt_spectator),
1304         fsparam_flag   ("ignore_local_fs",    Opt_ignore_local_fs),
1305         fsparam_flag   ("localflocks",        Opt_localflocks),
1306         fsparam_flag   ("localcaching",       Opt_localcaching),
1307         fsparam_flag_no("debug",              Opt_debug),
1308         fsparam_flag   ("upgrade",            Opt_upgrade),
1309         fsparam_flag_no("acl",                Opt_acl),
1310         fsparam_flag_no("suiddir",            Opt_suiddir),
1311         fsparam_enum   ("data",               Opt_data),
1312         fsparam_flag   ("meta",               Opt_meta),
1313         fsparam_flag_no("discard",            Opt_discard),
1314         fsparam_s32    ("commit",             Opt_commit),
1315         fsparam_enum   ("errors",             Opt_errors),
1316         fsparam_s32    ("statfs_quantum",     Opt_statfs_quantum),
1317         fsparam_s32    ("statfs_percent",     Opt_statfs_percent),
1318         fsparam_s32    ("quota_quantum",      Opt_quota_quantum),
1319         fsparam_flag_no("barrier",            Opt_barrier),
1320         fsparam_flag_no("rgrplvb",            Opt_rgrplvb),
1321         fsparam_flag_no("loccookie",          Opt_loccookie),
1322         /* quota can be a flag or an enum so it gets special treatment */
1323         __fsparam(fs_param_is_enum, "quota", Opt_quota, fs_param_neg_with_no|fs_param_v_optional),
1324         {}
1325 };
1326
1327 static const struct fs_parameter_enum gfs2_param_enums[] = {
1328         { Opt_quota,    "off",        Opt_quota_off },
1329         { Opt_quota,    "account",    Opt_quota_account },
1330         { Opt_quota,    "on",         Opt_quota_on },
1331         { Opt_data,     "writeback",  Opt_data_writeback },
1332         { Opt_data,     "ordered",    Opt_data_ordered },
1333         { Opt_errors,   "withdraw",   Opt_errors_withdraw },
1334         { Opt_errors,   "panic",      Opt_errors_panic },
1335         {}
1336 };
1337
1338 const struct fs_parameter_description gfs2_fs_parameters = {
1339         .name = "gfs2",
1340         .specs = gfs2_param_specs,
1341         .enums = gfs2_param_enums,
1342 };
1343
1344 /* Parse a single mount parameter */
1345 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1346 {
1347         struct gfs2_args *args = fc->fs_private;
1348         struct fs_parse_result result;
1349         int o;
1350
1351         o = fs_parse(fc, &gfs2_fs_parameters, param, &result);
1352         if (o < 0)
1353                 return o;
1354
1355         switch (o) {
1356         case Opt_lockproto:
1357                 strscpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1358                 break;
1359         case Opt_locktable:
1360                 strscpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1361                 break;
1362         case Opt_hostdata:
1363                 strscpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1364                 break;
1365         case Opt_spectator:
1366                 args->ar_spectator = 1;
1367                 break;
1368         case Opt_ignore_local_fs:
1369                 /* Retained for backwards compat only */
1370                 break;
1371         case Opt_localflocks:
1372                 args->ar_localflocks = 1;
1373                 break;
1374         case Opt_localcaching:
1375                 /* Retained for backwards compat only */
1376                 break;
1377         case Opt_debug:
1378                 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1379                         return invalf(fc, "gfs2: -o debug and -o errors=panic are mutually exclusive");
1380                 args->ar_debug = result.boolean;
1381                 break;
1382         case Opt_upgrade:
1383                 /* Retained for backwards compat only */
1384                 break;
1385         case Opt_acl:
1386                 args->ar_posix_acl = result.boolean;
1387                 break;
1388         case Opt_quota:
1389                 /* The quota option can be a flag or an enum. A non-zero int_32
1390                    result means that we have an enum index. Otherwise we have
1391                    to rely on the 'negated' flag to tell us whether 'quota' or
1392                    'noquota' was specified. */
1393                 if (result.negated)
1394                         args->ar_quota = GFS2_QUOTA_OFF;
1395                 else if (result.int_32 > 0)
1396                         args->ar_quota = opt_quota_values[result.int_32];
1397                 else
1398                         args->ar_quota = GFS2_QUOTA_ON;
1399                 break;
1400         case Opt_suiddir:
1401                 args->ar_suiddir = result.boolean;
1402                 break;
1403         case Opt_data:
1404                 /* The uint_32 result maps directly to GFS2_DATA_* */
1405                 args->ar_data = result.uint_32;
1406                 break;
1407         case Opt_meta:
1408                 args->ar_meta = 1;
1409                 break;
1410         case Opt_discard:
1411                 args->ar_discard = result.boolean;
1412                 break;
1413         case Opt_commit:
1414                 if (result.int_32 <= 0)
1415                         return invalf(fc, "gfs2: commit mount option requires a positive numeric argument");
1416                 args->ar_commit = result.int_32;
1417                 break;
1418         case Opt_statfs_quantum:
1419                 if (result.int_32 < 0)
1420                         return invalf(fc, "gfs2: statfs_quantum mount option requires a non-negative numeric argument");
1421                 args->ar_statfs_quantum = result.int_32;
1422                 break;
1423         case Opt_quota_quantum:
1424                 if (result.int_32 <= 0)
1425                         return invalf(fc, "gfs2: quota_quantum mount option requires a positive numeric argument");
1426                 args->ar_quota_quantum = result.int_32;
1427                 break;
1428         case Opt_statfs_percent:
1429                 if (result.int_32 < 0 || result.int_32 > 100)
1430                         return invalf(fc, "gfs2: statfs_percent mount option requires a numeric argument between 0 and 100");
1431                 args->ar_statfs_percent = result.int_32;
1432                 break;
1433         case Opt_errors:
1434                 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1435                         return invalf(fc, "gfs2: -o debug and -o errors=panic are mutually exclusive");
1436                 args->ar_errors = result.uint_32;
1437                 break;
1438         case Opt_barrier:
1439                 args->ar_nobarrier = result.boolean;
1440                 break;
1441         case Opt_rgrplvb:
1442                 args->ar_rgrplvb = result.boolean;
1443                 break;
1444         case Opt_loccookie:
1445                 args->ar_loccookie = result.boolean;
1446                 break;
1447         default:
1448                 return invalf(fc, "gfs2: invalid mount option: %s", param->key);
1449         }
1450         return 0;
1451 }
1452
1453 static int gfs2_reconfigure(struct fs_context *fc)
1454 {
1455         struct super_block *sb = fc->root->d_sb;
1456         struct gfs2_sbd *sdp = sb->s_fs_info;
1457         struct gfs2_args *oldargs = &sdp->sd_args;
1458         struct gfs2_args *newargs = fc->fs_private;
1459         struct gfs2_tune *gt = &sdp->sd_tune;
1460         int error = 0;
1461
1462         sync_filesystem(sb);
1463
1464         spin_lock(&gt->gt_spin);
1465         oldargs->ar_commit = gt->gt_logd_secs;
1466         oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1467         if (gt->gt_statfs_slow)
1468                 oldargs->ar_statfs_quantum = 0;
1469         else
1470                 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1471         spin_unlock(&gt->gt_spin);
1472
1473         if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1474                 errorf(fc, "gfs2: reconfiguration of locking protocol not allowed");
1475                 return -EINVAL;
1476         }
1477         if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1478                 errorf(fc, "gfs2: reconfiguration of lock table not allowed");
1479                 return -EINVAL;
1480         }
1481         if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1482                 errorf(fc, "gfs2: reconfiguration of host data not allowed");
1483                 return -EINVAL;
1484         }
1485         if (newargs->ar_spectator != oldargs->ar_spectator) {
1486                 errorf(fc, "gfs2: reconfiguration of spectator mode not allowed");
1487                 return -EINVAL;
1488         }
1489         if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1490                 errorf(fc, "gfs2: reconfiguration of localflocks not allowed");
1491                 return -EINVAL;
1492         }
1493         if (newargs->ar_meta != oldargs->ar_meta) {
1494                 errorf(fc, "gfs2: switching between gfs2 and gfs2meta not allowed");
1495                 return -EINVAL;
1496         }
1497         if (oldargs->ar_spectator)
1498                 fc->sb_flags |= SB_RDONLY;
1499
1500         if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1501                 if (fc->sb_flags & SB_RDONLY) {
1502                         error = gfs2_make_fs_ro(sdp);
1503                         if (error)
1504                                 errorf(fc, "gfs2: unable to remount read-only");
1505                 } else {
1506                         error = gfs2_make_fs_rw(sdp);
1507                         if (error)
1508                                 errorf(fc, "gfs2: unable to remount read-write");
1509                 }
1510         }
1511         sdp->sd_args = *newargs;
1512
1513         if (sdp->sd_args.ar_posix_acl)
1514                 sb->s_flags |= SB_POSIXACL;
1515         else
1516                 sb->s_flags &= ~SB_POSIXACL;
1517         if (sdp->sd_args.ar_nobarrier)
1518                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1519         else
1520                 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1521         spin_lock(&gt->gt_spin);
1522         gt->gt_logd_secs = newargs->ar_commit;
1523         gt->gt_quota_quantum = newargs->ar_quota_quantum;
1524         if (newargs->ar_statfs_quantum) {
1525                 gt->gt_statfs_slow = 0;
1526                 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1527         }
1528         else {
1529                 gt->gt_statfs_slow = 1;
1530                 gt->gt_statfs_quantum = 30;
1531         }
1532         spin_unlock(&gt->gt_spin);
1533
1534         gfs2_online_uevent(sdp);
1535         return error;
1536 }
1537
1538 static const struct fs_context_operations gfs2_context_ops = {
1539         .free        = gfs2_fc_free,
1540         .parse_param = gfs2_parse_param,
1541         .get_tree    = gfs2_get_tree,
1542         .reconfigure = gfs2_reconfigure,
1543 };
1544
1545 /* Set up the filesystem mount context */
1546 static int gfs2_init_fs_context(struct fs_context *fc)
1547 {
1548         struct gfs2_args *args;
1549
1550         args = kmalloc(sizeof(*args), GFP_KERNEL);
1551         if (args == NULL)
1552                 return -ENOMEM;
1553
1554         if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1555                 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1556
1557                 *args = sdp->sd_args;
1558         } else {
1559                 memset(args, 0, sizeof(*args));
1560                 args->ar_quota = GFS2_QUOTA_DEFAULT;
1561                 args->ar_data = GFS2_DATA_DEFAULT;
1562                 args->ar_commit = 30;
1563                 args->ar_statfs_quantum = 30;
1564                 args->ar_quota_quantum = 60;
1565                 args->ar_errors = GFS2_ERRORS_DEFAULT;
1566         }
1567         fc->fs_private = args;
1568         fc->ops = &gfs2_context_ops;
1569         return 0;
1570 }
1571
1572 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1573 {
1574         return -EINVAL;
1575 }
1576
1577 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1578 {
1579         return (fc->sget_key == s->s_bdev);
1580 }
1581
1582 static int gfs2_meta_get_tree(struct fs_context *fc)
1583 {
1584         struct super_block *s;
1585         struct gfs2_sbd *sdp;
1586         struct path path;
1587         int error;
1588
1589         if (!fc->source || !*fc->source)
1590                 return -EINVAL;
1591
1592         error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1593         if (error) {
1594                 pr_warn("path_lookup on %s returned error %d\n",
1595                         fc->source, error);
1596                 return error;
1597         }
1598         fc->fs_type = &gfs2_fs_type;
1599         fc->sget_key = path.dentry->d_sb->s_bdev;
1600         s = sget_fc(fc, test_meta_super, set_meta_super);
1601         path_put(&path);
1602         if (IS_ERR(s)) {
1603                 pr_warn("gfs2 mount does not exist\n");
1604                 return PTR_ERR(s);
1605         }
1606         if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1607                 deactivate_locked_super(s);
1608                 return -EBUSY;
1609         }
1610         sdp = s->s_fs_info;
1611         fc->root = dget(sdp->sd_master_dir);
1612         return 0;
1613 }
1614
1615 static const struct fs_context_operations gfs2_meta_context_ops = {
1616         .free        = gfs2_fc_free,
1617         .get_tree    = gfs2_meta_get_tree,
1618 };
1619
1620 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1621 {
1622         int ret = gfs2_init_fs_context(fc);
1623
1624         if (ret)
1625                 return ret;
1626
1627         fc->ops = &gfs2_meta_context_ops;
1628         return 0;
1629 }
1630
1631 static void gfs2_kill_sb(struct super_block *sb)
1632 {
1633         struct gfs2_sbd *sdp = sb->s_fs_info;
1634
1635         if (sdp == NULL) {
1636                 kill_block_super(sb);
1637                 return;
1638         }
1639
1640         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1641         dput(sdp->sd_root_dir);
1642         dput(sdp->sd_master_dir);
1643         sdp->sd_root_dir = NULL;
1644         sdp->sd_master_dir = NULL;
1645         shrink_dcache_sb(sb);
1646         kill_block_super(sb);
1647 }
1648
1649 struct file_system_type gfs2_fs_type = {
1650         .name = "gfs2",
1651         .fs_flags = FS_REQUIRES_DEV,
1652         .init_fs_context = gfs2_init_fs_context,
1653         .parameters = &gfs2_fs_parameters,
1654         .kill_sb = gfs2_kill_sb,
1655         .owner = THIS_MODULE,
1656 };
1657 MODULE_ALIAS_FS("gfs2");
1658
1659 struct file_system_type gfs2meta_fs_type = {
1660         .name = "gfs2meta",
1661         .fs_flags = FS_REQUIRES_DEV,
1662         .init_fs_context = gfs2_meta_init_fs_context,
1663         .owner = THIS_MODULE,
1664 };
1665 MODULE_ALIAS_FS("gfs2meta");