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 format numbers match exactly, we're done.  */
 173
 174         if (sb->sb_fs_format == GFS2_FORMAT_FS &&
 175             sb->sb_multihost_format == GFS2_FORMAT_MULTI)
 176                 return 0;
 177
 178         fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
 179
 180         return -EINVAL;
 181 }
 182
 183 static void end_bio_io_page(struct bio *bio)
 184 {
 185         struct page *page = bio->bi_private;
 186
 187         if (!bio->bi_status)
 188                 SetPageUptodate(page);
 189         else
 190                 pr_warn("error %d reading superblock\n", bio->bi_status);
 191         unlock_page(page);
 192 }
 193
 194 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
 195 {
 196         struct gfs2_sb_host *sb = &sdp->sd_sb;
 197         struct super_block *s = sdp->sd_vfs;
 198         const struct gfs2_sb *str = buf;
 199
 200         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
 201         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
 202         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
 203         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
 204         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
 205         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
 206         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
 207         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
 208         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
 209         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
 210         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
 211
 212         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
 213         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
 214         memcpy(&s->s_uuid, str->sb_uuid, 16);
 215 }
 216
 217 /**
 218  * gfs2_read_super - Read the gfs2 super block from disk
 219  * @sdp: The GFS2 super block
 220  * @sector: The location of the super block
 221  * @error: The error code to return
 222  *
 223  * This uses the bio functions to read the super block from disk
 224  * because we want to be 100% sure that we never read cached data.
 225  * A super block is read twice only during each GFS2 mount and is
 226  * never written to by the filesystem. The first time its read no
 227  * locks are held, and the only details which are looked at are those
 228  * relating to the locking protocol. Once locking is up and working,
 229  * the sb is read again under the lock to establish the location of
 230  * the master directory (contains pointers to journals etc) and the
 231  * root directory.
 232  *
 233  * Returns: 0 on success or error
 234  */
 235
 236 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
 237 {
 238         struct super_block *sb = sdp->sd_vfs;
 239         struct gfs2_sb *p;
 240         struct page *page;
 241         struct bio *bio;
 242
 243         page = alloc_page(GFP_NOFS);
 244         if (unlikely(!page))
 245                 return -ENOMEM;
 246
 247         ClearPageUptodate(page);
 248         ClearPageDirty(page);
 249         lock_page(page);
 250
 251         bio = bio_alloc(GFP_NOFS, 1);
 252         bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
 253         bio_set_dev(bio, sb->s_bdev);
 254         bio_add_page(bio, page, PAGE_SIZE, 0);
 255
 256         bio->bi_end_io = end_bio_io_page;
 257         bio->bi_private = page;
 258         bio_set_op_attrs(bio, REQ_OP_READ, REQ_META);
 259         submit_bio(bio);
 260         wait_on_page_locked(page);
 261         bio_put(bio);
 262         if (!PageUptodate(page)) {
 263                 __free_page(page);
 264                 return -EIO;
 265         }
 266         p = kmap(page);
 267         gfs2_sb_in(sdp, p);
 268         kunmap(page);
 269         __free_page(page);
 270         return gfs2_check_sb(sdp, silent);
 271 }
 272
 273 /**
 274  * gfs2_read_sb - Read super block
 275  * @sdp: The GFS2 superblock
 276  * @silent: Don't print message if mount fails
 277  *
 278  */
 279
 280 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
 281 {
 282         u32 hash_blocks, ind_blocks, leaf_blocks;
 283         u32 tmp_blocks;
 284         unsigned int x;
 285         int error;
 286
 287         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 288         if (error) {
 289                 if (!silent)
 290                         fs_err(sdp, "can't read superblock\n");
 291                 return error;
 292         }
 293
 294         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 295                                GFS2_BASIC_BLOCK_SHIFT;
 296         sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
 297         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 298                           sizeof(struct gfs2_dinode)) / sizeof(u64);
 299         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 300                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
 301         sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize -
 302                           sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
 303         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 304         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 305         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 306         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 307         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 308                                 sizeof(struct gfs2_meta_header)) /
 309                                 sizeof(struct gfs2_quota_change);
 310         sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
 311                                      sizeof(struct gfs2_meta_header))
 312                 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
 313
 314         /* Compute maximum reservation required to add a entry to a directory */
 315
 316         hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
 317                              sdp->sd_jbsize);
 318
 319         ind_blocks = 0;
 320         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
 321                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
 322                 ind_blocks += tmp_blocks;
 323         }
 324
 325         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
 326
 327         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
 328
 329         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
 330                                 sizeof(struct gfs2_dinode);
 331         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
 332         for (x = 2;; x++) {
 333                 u64 space, d;
 334                 u32 m;
 335
 336                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
 337                 d = space;
 338                 m = do_div(d, sdp->sd_inptrs);
 339
 340                 if (d != sdp->sd_heightsize[x - 1] || m)
 341                         break;
 342                 sdp->sd_heightsize[x] = space;
 343         }
 344         sdp->sd_max_height = x;
 345         sdp->sd_heightsize[x] = ~0;
 346         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
 347
 348         sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
 349                                       sizeof(struct gfs2_leaf)) /
 350                                      GFS2_MIN_DIRENT_SIZE;
 351         return 0;
 352 }
 353
 354 static int init_names(struct gfs2_sbd *sdp, int silent)
 355 {
 356         char *proto, *table;
 357         int error = 0;
 358
 359         proto = sdp->sd_args.ar_lockproto;
 360         table = sdp->sd_args.ar_locktable;
 361
 362         /*  Try to autodetect  */
 363
 364         if (!proto[0] || !table[0]) {
 365                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 366                 if (error)
 367                         return error;
 368
 369                 if (!proto[0])
 370                         proto = sdp->sd_sb.sb_lockproto;
 371                 if (!table[0])
 372                         table = sdp->sd_sb.sb_locktable;
 373         }
 374
 375         if (!table[0])
 376                 table = sdp->sd_vfs->s_id;
 377
 378         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
 379         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
 380
 381         table = sdp->sd_table_name;
 382         while ((table = strchr(table, '/')))
 383                 *table = '_';
 384
 385         return error;
 386 }
 387
 388 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 389                         int undo)
 390 {
 391         int error = 0;
 392
 393         if (undo)
 394                 goto fail_trans;
 395
 396         error = gfs2_glock_nq_num(sdp,
 397                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 398                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 399                                   mount_gh);
 400         if (error) {
 401                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 402                 goto fail;
 403         }
 404
 405         error = gfs2_glock_nq_num(sdp,
 406                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 407                                   LM_ST_SHARED,
 408                                   LM_FLAG_NOEXP | GL_EXACT,
 409                                   &sdp->sd_live_gh);
 410         if (error) {
 411                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 412                 goto fail_mount;
 413         }
 414
 415         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 416                                CREATE, &sdp->sd_rename_gl);
 417         if (error) {
 418                 fs_err(sdp, "can't create rename glock: %d\n", error);
 419                 goto fail_live;
 420         }
 421
 422         error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
 423                                CREATE, &sdp->sd_freeze_gl);
 424         if (error) {
 425                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 426                 goto fail_rename;
 427         }
 428
 429         return 0;
 430
 431 fail_trans:
 432         gfs2_glock_put(sdp->sd_freeze_gl);
 433 fail_rename:
 434         gfs2_glock_put(sdp->sd_rename_gl);
 435 fail_live:
 436         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 437 fail_mount:
 438         gfs2_glock_dq_uninit(mount_gh);
 439 fail:
 440         return error;
 441 }
 442
 443 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
 444                             u64 no_addr, const char *name)
 445 {
 446         struct gfs2_sbd *sdp = sb->s_fs_info;
 447         struct dentry *dentry;
 448         struct inode *inode;
 449
 450         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
 451                                   GFS2_BLKST_FREE /* ignore */);
 452         if (IS_ERR(inode)) {
 453                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
 454                 return PTR_ERR(inode);
 455         }
 456         dentry = d_make_root(inode);
 457         if (!dentry) {
 458                 fs_err(sdp, "can't alloc %s dentry\n", name);
 459                 return -ENOMEM;
 460         }
 461         *dptr = dentry;
 462         return 0;
 463 }
 464
 465 static int init_sb(struct gfs2_sbd *sdp, int silent)
 466 {
 467         struct super_block *sb = sdp->sd_vfs;
 468         struct gfs2_holder sb_gh;
 469         u64 no_addr;
 470         int ret;
 471
 472         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 473                                 LM_ST_SHARED, 0, &sb_gh);
 474         if (ret) {
 475                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
 476                 return ret;
 477         }
 478
 479         ret = gfs2_read_sb(sdp, silent);
 480         if (ret) {
 481                 fs_err(sdp, "can't read superblock: %d\n", ret);
 482                 goto out;
 483         }
 484
 485         /* Set up the buffer cache and SB for real */
 486         if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
 487                 ret = -EINVAL;
 488                 fs_err(sdp, "FS block size (%u) is too small for device "
 489                        "block size (%u)\n",
 490                        sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
 491                 goto out;
 492         }
 493         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 494                 ret = -EINVAL;
 495                 fs_err(sdp, "FS block size (%u) is too big for machine "
 496                        "page size (%u)\n",
 497                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 498                 goto out;
 499         }
 500         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 501
 502         /* Get the root inode */
 503         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 504         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 505         if (ret)
 506                 goto out;
 507
 508         /* Get the master inode */
 509         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 510         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 511         if (ret) {
 512                 dput(sdp->sd_root_dir);
 513                 goto out;
 514         }
 515         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 516 out:
 517         gfs2_glock_dq_uninit(&sb_gh);
 518         return ret;
 519 }
 520
 521 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
 522 {
 523         char *message = "FIRSTMOUNT=Done";
 524         char *envp[] = { message, NULL };
 525
 526         fs_info(sdp, "first mount done, others may mount\n");
 527
 528         if (sdp->sd_lockstruct.ls_ops->lm_first_done)
 529                 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
 530
 531         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
 532 }
 533
 534 /**
 535  * gfs2_jindex_hold - Grab a lock on the jindex
 536  * @sdp: The GFS2 superblock
 537  * @ji_gh: the holder for the jindex glock
 538  *
 539  * Returns: errno
 540  */
 541
 542 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 543 {
 544         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
 545         struct qstr name;
 546         char buf[20];
 547         struct gfs2_jdesc *jd;
 548         int error;
 549
 550         name.name = buf;
 551
 552         mutex_lock(&sdp->sd_jindex_mutex);
 553
 554         for (;;) {
 555                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
 556                 if (error)
 557                         break;
 558
 559                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
 560                 name.hash = gfs2_disk_hash(name.name, name.len);
 561
 562                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
 563                 if (error == -ENOENT) {
 564                         error = 0;
 565                         break;
 566                 }
 567
 568                 gfs2_glock_dq_uninit(ji_gh);
 569
 570                 if (error)
 571                         break;
 572
 573                 error = -ENOMEM;
 574                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
 575                 if (!jd)
 576                         break;
 577
 578                 INIT_LIST_HEAD(&jd->extent_list);
 579                 INIT_LIST_HEAD(&jd->jd_revoke_list);
 580
 581                 INIT_WORK(&jd->jd_work, gfs2_recover_func);
 582                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
 583                 if (IS_ERR_OR_NULL(jd->jd_inode)) {
 584                         if (!jd->jd_inode)
 585                                 error = -ENOENT;
 586                         else
 587                                 error = PTR_ERR(jd->jd_inode);
 588                         kfree(jd);
 589                         break;
 590                 }
 591
 592                 spin_lock(&sdp->sd_jindex_spin);
 593                 jd->jd_jid = sdp->sd_journals++;
 594                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
 595                 spin_unlock(&sdp->sd_jindex_spin);
 596         }
 597
 598         mutex_unlock(&sdp->sd_jindex_mutex);
 599
 600         return error;
 601 }
 602
 603 /**
 604  * check_journal_clean - Make sure a journal is clean for a spectator mount
 605  * @sdp: The GFS2 superblock
 606  * @jd: The journal descriptor
 607  *
 608  * Returns: 0 if the journal is clean or locked, else an error
 609  */
 610 static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd)
 611 {
 612         int error;
 613         struct gfs2_holder j_gh;
 614         struct gfs2_log_header_host head;
 615         struct gfs2_inode *ip;
 616
 617         ip = GFS2_I(jd->jd_inode);
 618         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP |
 619                                    GL_EXACT | GL_NOCACHE, &j_gh);
 620         if (error) {
 621                 fs_err(sdp, "Error locking journal for spectator mount.\n");
 622                 return -EPERM;
 623         }
 624         error = gfs2_jdesc_check(jd);
 625         if (error) {
 626                 fs_err(sdp, "Error checking journal for spectator mount.\n");
 627                 goto out_unlock;
 628         }
 629         error = gfs2_find_jhead(jd, &head, false);
 630         if (error) {
 631                 fs_err(sdp, "Error parsing journal for spectator mount.\n");
 632                 goto out_unlock;
 633         }
 634         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 635                 error = -EPERM;
 636                 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter "
 637                        "must not be a spectator.\n", jd->jd_jid);
 638         }
 639
 640 out_unlock:
 641         gfs2_glock_dq_uninit(&j_gh);
 642         return error;
 643 }
 644
 645 static int init_journal(struct gfs2_sbd *sdp, int undo)
 646 {
 647         struct inode *master = d_inode(sdp->sd_master_dir);
 648         struct gfs2_holder ji_gh;
 649         struct gfs2_inode *ip;
 650         int jindex = 1;
 651         int error = 0;
 652
 653         if (undo) {
 654                 jindex = 0;
 655                 goto fail_jinode_gh;
 656         }
 657
 658         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
 659         if (IS_ERR(sdp->sd_jindex)) {
 660                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 661                 return PTR_ERR(sdp->sd_jindex);
 662         }
 663
 664         /* Load in the journal index special file */
 665
 666         error = gfs2_jindex_hold(sdp, &ji_gh);
 667         if (error) {
 668                 fs_err(sdp, "can't read journal index: %d\n", error);
 669                 goto fail;
 670         }
 671
 672         error = -EUSERS;
 673         if (!gfs2_jindex_size(sdp)) {
 674                 fs_err(sdp, "no journals!\n");
 675                 goto fail_jindex;
 676         }
 677
 678         atomic_set(&sdp->sd_log_blks_needed, 0);
 679         if (sdp->sd_args.ar_spectator) {
 680                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 681                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 682                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 683                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 684         } else {
 685                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 686                         fs_err(sdp, "can't mount journal #%u\n",
 687                                sdp->sd_lockstruct.ls_jid);
 688                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 689                                gfs2_jindex_size(sdp),
 690                                gfs2_jindex_size(sdp) - 1);
 691                         goto fail_jindex;
 692                 }
 693                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 694
 695                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 696                                           &gfs2_journal_glops,
 697                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 698                                           &sdp->sd_journal_gh);
 699                 if (error) {
 700                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 701                         goto fail_jindex;
 702                 }
 703
 704                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 705                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 706                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 707                                            &sdp->sd_jinode_gh);
 708                 if (error) {
 709                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 710                                error);
 711                         goto fail_journal_gh;
 712                 }
 713
 714                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 715                 if (error) {
 716                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 717                                sdp->sd_jdesc->jd_jid, error);
 718                         goto fail_jinode_gh;
 719                 }
 720                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 721                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 722                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 723
 724                 /* Map the extents for this journal's blocks */
 725                 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
 726         }
 727         trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
 728
 729         if (sdp->sd_lockstruct.ls_first) {
 730                 unsigned int x;
 731                 for (x = 0; x < sdp->sd_journals; x++) {
 732                         struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
 733
 734                         if (sdp->sd_args.ar_spectator) {
 735                                 error = check_journal_clean(sdp, jd);
 736                                 if (error)
 737                                         goto fail_jinode_gh;
 738                                 continue;
 739                         }
 740                         error = gfs2_recover_journal(jd, true);
 741                         if (error) {
 742                                 fs_err(sdp, "error recovering journal %u: %d\n",
 743                                        x, error);
 744                                 goto fail_jinode_gh;
 745                         }
 746                 }
 747
 748                 gfs2_others_may_mount(sdp);
 749         } else if (!sdp->sd_args.ar_spectator) {
 750                 error = gfs2_recover_journal(sdp->sd_jdesc, true);
 751                 if (error) {
 752                         fs_err(sdp, "error recovering my journal: %d\n", error);
 753                         goto fail_jinode_gh;
 754                 }
 755         }
 756
 757         sdp->sd_log_idle = 1;
 758         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 759         gfs2_glock_dq_uninit(&ji_gh);
 760         jindex = 0;
 761         INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
 762         return 0;
 763
 764 fail_jinode_gh:
 765         if (!sdp->sd_args.ar_spectator)
 766                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 767 fail_journal_gh:
 768         if (!sdp->sd_args.ar_spectator)
 769                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 770 fail_jindex:
 771         gfs2_jindex_free(sdp);
 772         if (jindex)
 773                 gfs2_glock_dq_uninit(&ji_gh);
 774 fail:
 775         iput(sdp->sd_jindex);
 776         return error;
 777 }
 778
 779 static struct lock_class_key gfs2_quota_imutex_key;
 780
 781 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 782 {
 783         int error = 0;
 784         struct inode *master = d_inode(sdp->sd_master_dir);
 785
 786         if (undo)
 787                 goto fail_qinode;
 788
 789         error = init_journal(sdp, undo);
 790         complete_all(&sdp->sd_journal_ready);
 791         if (error)
 792                 goto fail;
 793
 794         /* Read in the master statfs inode */
 795         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 796         if (IS_ERR(sdp->sd_statfs_inode)) {
 797                 error = PTR_ERR(sdp->sd_statfs_inode);
 798                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 799                 goto fail_journal;
 800         }
 801
 802         /* Read in the resource index inode */
 803         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 804         if (IS_ERR(sdp->sd_rindex)) {
 805                 error = PTR_ERR(sdp->sd_rindex);
 806                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 807                 goto fail_statfs;
 808         }
 809         sdp->sd_rindex_uptodate = 0;
 810
 811         /* Read in the quota inode */
 812         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 813         if (IS_ERR(sdp->sd_quota_inode)) {
 814                 error = PTR_ERR(sdp->sd_quota_inode);
 815                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 816                 goto fail_rindex;
 817         }
 818         /*
 819          * i_rwsem on quota files is special. Since this inode is hidden system
 820          * file, we are safe to define locking ourselves.
 821          */
 822         lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
 823                           &gfs2_quota_imutex_key);
 824
 825         error = gfs2_rindex_update(sdp);
 826         if (error)
 827                 goto fail_qinode;
 828
 829         return 0;
 830
 831 fail_qinode:
 832         iput(sdp->sd_quota_inode);
 833 fail_rindex:
 834         gfs2_clear_rgrpd(sdp);
 835         iput(sdp->sd_rindex);
 836 fail_statfs:
 837         iput(sdp->sd_statfs_inode);
 838 fail_journal:
 839         init_journal(sdp, UNDO);
 840 fail:
 841         return error;
 842 }
 843
 844 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 845 {
 846         struct inode *pn = NULL;
 847         char buf[30];
 848         int error = 0;
 849         struct gfs2_inode *ip;
 850         struct inode *master = d_inode(sdp->sd_master_dir);
 851
 852         if (sdp->sd_args.ar_spectator)
 853                 return 0;
 854
 855         if (undo)
 856                 goto fail_qc_gh;
 857
 858         pn = gfs2_lookup_simple(master, "per_node");
 859         if (IS_ERR(pn)) {
 860                 error = PTR_ERR(pn);
 861                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 862                 return error;
 863         }
 864
 865         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 866         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 867         if (IS_ERR(sdp->sd_sc_inode)) {
 868                 error = PTR_ERR(sdp->sd_sc_inode);
 869                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 870                 goto fail;
 871         }
 872
 873         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 874         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 875         if (IS_ERR(sdp->sd_qc_inode)) {
 876                 error = PTR_ERR(sdp->sd_qc_inode);
 877                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 878                 goto fail_ut_i;
 879         }
 880
 881         iput(pn);
 882         pn = NULL;
 883
 884         ip = GFS2_I(sdp->sd_sc_inode);
 885         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 886                                    &sdp->sd_sc_gh);
 887         if (error) {
 888                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 889                 goto fail_qc_i;
 890         }
 891
 892         ip = GFS2_I(sdp->sd_qc_inode);
 893         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 894                                    &sdp->sd_qc_gh);
 895         if (error) {
 896                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 897                 goto fail_ut_gh;
 898         }
 899
 900         return 0;
 901
 902 fail_qc_gh:
 903         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 904 fail_ut_gh:
 905         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 906 fail_qc_i:
 907         iput(sdp->sd_qc_inode);
 908 fail_ut_i:
 909         iput(sdp->sd_sc_inode);
 910 fail:
 911         iput(pn);
 912         return error;
 913 }
 914
 915 static const match_table_t nolock_tokens = {
 916         { Opt_jid, "jid=%d\n", },
 917         { Opt_err, NULL },
 918 };
 919
 920 static const struct lm_lockops nolock_ops = {
 921         .lm_proto_name = "lock_nolock",
 922         .lm_put_lock = gfs2_glock_free,
 923         .lm_tokens = &nolock_tokens,
 924 };
 925
 926 /**
 927  * gfs2_lm_mount - mount a locking protocol
 928  * @sdp: the filesystem
 929  * @args: mount arguments
 930  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
 931  *
 932  * Returns: errno
 933  */
 934
 935 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
 936 {
 937         const struct lm_lockops *lm;
 938         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 939         struct gfs2_args *args = &sdp->sd_args;
 940         const char *proto = sdp->sd_proto_name;
 941         const char *table = sdp->sd_table_name;
 942         char *o, *options;
 943         int ret;
 944
 945         if (!strcmp("lock_nolock", proto)) {
 946                 lm = &nolock_ops;
 947                 sdp->sd_args.ar_localflocks = 1;
 948 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
 949         } else if (!strcmp("lock_dlm", proto)) {
 950                 lm = &gfs2_dlm_ops;
 951 #endif
 952         } else {
 953                 pr_info("can't find protocol %s\n", proto);
 954                 return -ENOENT;
 955         }
 956
 957         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
 958
 959         ls->ls_ops = lm;
 960         ls->ls_first = 1;
 961
 962         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
 963                 substring_t tmp[MAX_OPT_ARGS];
 964                 int token, option;
 965
 966                 if (!o || !*o)
 967                         continue;
 968
 969                 token = match_token(o, *lm->lm_tokens, tmp);
 970                 switch (token) {
 971                 case Opt_jid:
 972                         ret = match_int(&tmp[0], &option);
 973                         if (ret || option < 0)
 974                                 goto hostdata_error;
 975                         if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
 976                                 ls->ls_jid = option;
 977                         break;
 978                 case Opt_id:
 979                 case Opt_nodir:
 980                         /* Obsolete, but left for backward compat purposes */
 981                         break;
 982                 case Opt_first:
 983                         ret = match_int(&tmp[0], &option);
 984                         if (ret || (option != 0 && option != 1))
 985                                 goto hostdata_error;
 986                         ls->ls_first = option;
 987                         break;
 988                 case Opt_err:
 989                 default:
 990 hostdata_error:
 991                         fs_info(sdp, "unknown hostdata (%s)\n", o);
 992                         return -EINVAL;
 993                 }
 994         }
 995
 996         if (lm->lm_mount == NULL) {
 997                 fs_info(sdp, "Now mounting FS...\n");
 998                 complete_all(&sdp->sd_locking_init);
 999                 return 0;
1000         }
1001         ret = lm->lm_mount(sdp, table);
1002         if (ret == 0)
1003                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1004         complete_all(&sdp->sd_locking_init);
1005         return ret;
1006 }
1007
1008 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1009 {
1010         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1011         if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount)
1012                 lm->lm_unmount(sdp);
1013 }
1014
1015 static int wait_on_journal(struct gfs2_sbd *sdp)
1016 {
1017         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1018                 return 0;
1019
1020         return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1021                 ? -EINTR : 0;
1022 }
1023
1024 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1025 {
1026         struct super_block *sb = sdp->sd_vfs;
1027         char ro[20];
1028         char spectator[20];
1029         char *envp[] = { ro, spectator, NULL };
1030         sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1031         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1032         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1033 }
1034
1035 /**
1036  * gfs2_fill_super - Read in superblock
1037  * @sb: The VFS superblock
1038  * @args: Mount options
1039  * @silent: Don't complain if it's not a GFS2 filesystem
1040  *
1041  * Returns: -errno
1042  */
1043 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1044 {
1045         struct gfs2_args *args = fc->fs_private;
1046         int silent = fc->sb_flags & SB_SILENT;
1047         struct gfs2_sbd *sdp;
1048         struct gfs2_holder mount_gh;
1049         int error;
1050
1051         sdp = init_sbd(sb);
1052         if (!sdp) {
1053                 pr_warn("can't alloc struct gfs2_sbd\n");
1054                 return -ENOMEM;
1055         }
1056         sdp->sd_args = *args;
1057
1058         if (sdp->sd_args.ar_spectator) {
1059                 sb->s_flags |= SB_RDONLY;
1060                 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1061         }
1062         if (sdp->sd_args.ar_posix_acl)
1063                 sb->s_flags |= SB_POSIXACL;
1064         if (sdp->sd_args.ar_nobarrier)
1065                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1066
1067         sb->s_flags |= SB_NOSEC;
1068         sb->s_magic = GFS2_MAGIC;
1069         sb->s_op = &gfs2_super_ops;
1070         sb->s_d_op = &gfs2_dops;
1071         sb->s_export_op = &gfs2_export_ops;
1072         sb->s_xattr = gfs2_xattr_handlers;
1073         sb->s_qcop = &gfs2_quotactl_ops;
1074         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1075         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1076         sb->s_time_gran = 1;
1077         sb->s_maxbytes = MAX_LFS_FILESIZE;
1078
1079         /* Set up the buffer cache and fill in some fake block size values
1080            to allow us to read-in the on-disk superblock. */
1081         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1082         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1083         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1084                                GFS2_BASIC_BLOCK_SHIFT;
1085         sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1086
1087         sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1088         sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1089         if (sdp->sd_args.ar_statfs_quantum) {
1090                 sdp->sd_tune.gt_statfs_slow = 0;
1091                 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1092         } else {
1093                 sdp->sd_tune.gt_statfs_slow = 1;
1094                 sdp->sd_tune.gt_statfs_quantum = 30;
1095         }
1096
1097         error = init_names(sdp, silent);
1098         if (error) {
1099                 /* In this case, we haven't initialized sysfs, so we have to
1100                    manually free the sdp. */
1101                 free_sbd(sdp);
1102                 sb->s_fs_info = NULL;
1103                 return error;
1104         }
1105
1106         snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1107
1108         error = gfs2_sys_fs_add(sdp);
1109         /*
1110          * If we hit an error here, gfs2_sys_fs_add will have called function
1111          * kobject_put which causes the sysfs usage count to go to zero, which
1112          * causes sysfs to call function gfs2_sbd_release, which frees sdp.
1113          * Subsequent error paths here will call gfs2_sys_fs_del, which also
1114          * kobject_put to free sdp.
1115          */
1116         if (error)
1117                 return error;
1118
1119         gfs2_create_debugfs_file(sdp);
1120
1121         error = gfs2_lm_mount(sdp, silent);
1122         if (error)
1123                 goto fail_debug;
1124
1125         error = init_locking(sdp, &mount_gh, DO);
1126         if (error)
1127                 goto fail_lm;
1128
1129         error = init_sb(sdp, silent);
1130         if (error)
1131                 goto fail_locking;
1132
1133         error = wait_on_journal(sdp);
1134         if (error)
1135                 goto fail_sb;
1136
1137         /*
1138          * If user space has failed to join the cluster or some similar
1139          * failure has occurred, then the journal id will contain a
1140          * negative (error) number. This will then be returned to the
1141          * caller (of the mount syscall). We do this even for spectator
1142          * mounts (which just write a jid of 0 to indicate "ok" even though
1143          * the jid is unused in the spectator case)
1144          */
1145         if (sdp->sd_lockstruct.ls_jid < 0) {
1146                 error = sdp->sd_lockstruct.ls_jid;
1147                 sdp->sd_lockstruct.ls_jid = 0;
1148                 goto fail_sb;
1149         }
1150
1151         if (sdp->sd_args.ar_spectator)
1152                 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1153                          sdp->sd_table_name);
1154         else
1155                 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1156                          sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1157
1158         error = init_inodes(sdp, DO);
1159         if (error)
1160                 goto fail_sb;
1161
1162         error = init_per_node(sdp, DO);
1163         if (error)
1164                 goto fail_inodes;
1165
1166         error = gfs2_statfs_init(sdp);
1167         if (error) {
1168                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1169                 goto fail_per_node;
1170         }
1171
1172         if (!sb_rdonly(sb)) {
1173                 error = gfs2_make_fs_rw(sdp);
1174                 if (error) {
1175                         fs_err(sdp, "can't make FS RW: %d\n", error);
1176                         goto fail_per_node;
1177                 }
1178         }
1179
1180         gfs2_glock_dq_uninit(&mount_gh);
1181         gfs2_online_uevent(sdp);
1182         return 0;
1183
1184 fail_per_node:
1185         init_per_node(sdp, UNDO);
1186 fail_inodes:
1187         init_inodes(sdp, UNDO);
1188 fail_sb:
1189         if (sdp->sd_root_dir)
1190                 dput(sdp->sd_root_dir);
1191         if (sdp->sd_master_dir)
1192                 dput(sdp->sd_master_dir);
1193         if (sb->s_root)
1194                 dput(sb->s_root);
1195         sb->s_root = NULL;
1196 fail_locking:
1197         init_locking(sdp, &mount_gh, UNDO);
1198 fail_lm:
1199         complete_all(&sdp->sd_journal_ready);
1200         gfs2_gl_hash_clear(sdp);
1201         gfs2_lm_unmount(sdp);
1202 fail_debug:
1203         gfs2_delete_debugfs_file(sdp);
1204         /* gfs2_sys_fs_del must be the last thing we do, since it causes
1205          * sysfs to call function gfs2_sbd_release, which frees sdp. */
1206         gfs2_sys_fs_del(sdp);
1207         sb->s_fs_info = NULL;
1208         return error;
1209 }
1210
1211 /**
1212  * gfs2_get_tree - Get the GFS2 superblock and root directory
1213  * @fc: The filesystem context
1214  *
1215  * Returns: 0 or -errno on error
1216  */
1217 static int gfs2_get_tree(struct fs_context *fc)
1218 {
1219         struct gfs2_args *args = fc->fs_private;
1220         struct gfs2_sbd *sdp;
1221         int error;
1222
1223         error = get_tree_bdev(fc, gfs2_fill_super);
1224         if (error)
1225                 return error;
1226
1227         sdp = fc->root->d_sb->s_fs_info;
1228         dput(fc->root);
1229         if (args->ar_meta)
1230                 fc->root = dget(sdp->sd_master_dir);
1231         else
1232                 fc->root = dget(sdp->sd_root_dir);
1233         return 0;
1234 }
1235
1236 static void gfs2_fc_free(struct fs_context *fc)
1237 {
1238         struct gfs2_args *args = fc->fs_private;
1239
1240         kfree(args);
1241 }
1242
1243 enum gfs2_param {
1244         Opt_lockproto,
1245         Opt_locktable,
1246         Opt_hostdata,
1247         Opt_spectator,
1248         Opt_ignore_local_fs,
1249         Opt_localflocks,
1250         Opt_localcaching,
1251         Opt_debug,
1252         Opt_upgrade,
1253         Opt_acl,
1254         Opt_quota,
1255         Opt_suiddir,
1256         Opt_data,
1257         Opt_meta,
1258         Opt_discard,
1259         Opt_commit,
1260         Opt_errors,
1261         Opt_statfs_quantum,
1262         Opt_statfs_percent,
1263         Opt_quota_quantum,
1264         Opt_barrier,
1265         Opt_rgrplvb,
1266         Opt_loccookie,
1267 };
1268
1269 enum opt_quota {
1270         Opt_quota_unset = 0,
1271         Opt_quota_off,
1272         Opt_quota_account,
1273         Opt_quota_on,
1274 };
1275
1276 static const unsigned int opt_quota_values[] = {
1277         [Opt_quota_off]     = GFS2_QUOTA_OFF,
1278         [Opt_quota_account] = GFS2_QUOTA_ACCOUNT,
1279         [Opt_quota_on]      = GFS2_QUOTA_ON,
1280 };
1281
1282 enum opt_data {
1283         Opt_data_writeback = GFS2_DATA_WRITEBACK,
1284         Opt_data_ordered   = GFS2_DATA_ORDERED,
1285 };
1286
1287 enum opt_errors {
1288         Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1289         Opt_errors_panic    = GFS2_ERRORS_PANIC,
1290 };
1291
1292 static const struct fs_parameter_spec gfs2_param_specs[] = {
1293         fsparam_string ("lockproto",          Opt_lockproto),
1294         fsparam_string ("locktable",          Opt_locktable),
1295         fsparam_string ("hostdata",           Opt_hostdata),
1296         fsparam_flag   ("spectator",          Opt_spectator),
1297         fsparam_flag   ("norecovery",         Opt_spectator),
1298         fsparam_flag   ("ignore_local_fs",    Opt_ignore_local_fs),
1299         fsparam_flag   ("localflocks",        Opt_localflocks),
1300         fsparam_flag   ("localcaching",       Opt_localcaching),
1301         fsparam_flag_no("debug",              Opt_debug),
1302         fsparam_flag   ("upgrade",            Opt_upgrade),
1303         fsparam_flag_no("acl",                Opt_acl),
1304         fsparam_flag_no("suiddir",            Opt_suiddir),
1305         fsparam_enum   ("data",               Opt_data),
1306         fsparam_flag   ("meta",               Opt_meta),
1307         fsparam_flag_no("discard",            Opt_discard),
1308         fsparam_s32    ("commit",             Opt_commit),
1309         fsparam_enum   ("errors",             Opt_errors),
1310         fsparam_s32    ("statfs_quantum",     Opt_statfs_quantum),
1311         fsparam_s32    ("statfs_percent",     Opt_statfs_percent),
1312         fsparam_s32    ("quota_quantum",      Opt_quota_quantum),
1313         fsparam_flag_no("barrier",            Opt_barrier),
1314         fsparam_flag_no("rgrplvb",            Opt_rgrplvb),
1315         fsparam_flag_no("loccookie",          Opt_loccookie),
1316         /* quota can be a flag or an enum so it gets special treatment */
1317         __fsparam(fs_param_is_enum, "quota", Opt_quota, fs_param_neg_with_no|fs_param_v_optional),
1318         {}
1319 };
1320
1321 static const struct fs_parameter_enum gfs2_param_enums[] = {
1322         { Opt_quota,    "off",        Opt_quota_off },
1323         { Opt_quota,    "account",    Opt_quota_account },
1324         { Opt_quota,    "on",         Opt_quota_on },
1325         { Opt_data,     "writeback",  Opt_data_writeback },
1326         { Opt_data,     "ordered",    Opt_data_ordered },
1327         { Opt_errors,   "withdraw",   Opt_errors_withdraw },
1328         { Opt_errors,   "panic",      Opt_errors_panic },
1329         {}
1330 };
1331
1332 static const struct fs_parameter_description gfs2_fs_parameters = {
1333         .name = "gfs2",
1334         .specs = gfs2_param_specs,
1335         .enums = gfs2_param_enums,
1336 };
1337
1338 /* Parse a single mount parameter */
1339 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1340 {
1341         struct gfs2_args *args = fc->fs_private;
1342         struct fs_parse_result result;
1343         int o;
1344
1345         o = fs_parse(fc, &gfs2_fs_parameters, param, &result);
1346         if (o < 0)
1347                 return o;
1348
1349         switch (o) {
1350         case Opt_lockproto:
1351                 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1352                 break;
1353         case Opt_locktable:
1354                 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1355                 break;
1356         case Opt_hostdata:
1357                 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1358                 break;
1359         case Opt_spectator:
1360                 args->ar_spectator = 1;
1361                 break;
1362         case Opt_ignore_local_fs:
1363                 /* Retained for backwards compat only */
1364                 break;
1365         case Opt_localflocks:
1366                 args->ar_localflocks = 1;
1367                 break;
1368         case Opt_localcaching:
1369                 /* Retained for backwards compat only */
1370                 break;
1371         case Opt_debug:
1372                 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1373                         return invalf(fc, "gfs2: -o debug and -o errors=panic are mutually exclusive");
1374                 args->ar_debug = result.boolean;
1375                 break;
1376         case Opt_upgrade:
1377                 /* Retained for backwards compat only */
1378                 break;
1379         case Opt_acl:
1380                 args->ar_posix_acl = result.boolean;
1381                 break;
1382         case Opt_quota:
1383                 /* The quota option can be a flag or an enum. A non-zero int_32
1384                    result means that we have an enum index. Otherwise we have
1385                    to rely on the 'negated' flag to tell us whether 'quota' or
1386                    'noquota' was specified. */
1387                 if (result.negated)
1388                         args->ar_quota = GFS2_QUOTA_OFF;
1389                 else if (result.int_32 > 0)
1390                         args->ar_quota = opt_quota_values[result.int_32];
1391                 else
1392                         args->ar_quota = GFS2_QUOTA_ON;
1393                 break;
1394         case Opt_suiddir:
1395                 args->ar_suiddir = result.boolean;
1396                 break;
1397         case Opt_data:
1398                 /* The uint_32 result maps directly to GFS2_DATA_* */
1399                 args->ar_data = result.uint_32;
1400                 break;
1401         case Opt_meta:
1402                 args->ar_meta = 1;
1403                 break;
1404         case Opt_discard:
1405                 args->ar_discard = result.boolean;
1406                 break;
1407         case Opt_commit:
1408                 if (result.int_32 <= 0)
1409                         return invalf(fc, "gfs2: commit mount option requires a positive numeric argument");
1410                 args->ar_commit = result.int_32;
1411                 break;
1412         case Opt_statfs_quantum:
1413                 if (result.int_32 < 0)
1414                         return invalf(fc, "gfs2: statfs_quantum mount option requires a non-negative numeric argument");
1415                 args->ar_statfs_quantum = result.int_32;
1416                 break;
1417         case Opt_quota_quantum:
1418                 if (result.int_32 <= 0)
1419                         return invalf(fc, "gfs2: quota_quantum mount option requires a positive numeric argument");
1420                 args->ar_quota_quantum = result.int_32;
1421                 break;
1422         case Opt_statfs_percent:
1423                 if (result.int_32 < 0 || result.int_32 > 100)
1424                         return invalf(fc, "gfs2: statfs_percent mount option requires a numeric argument between 0 and 100");
1425                 args->ar_statfs_percent = result.int_32;
1426                 break;
1427         case Opt_errors:
1428                 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1429                         return invalf(fc, "gfs2: -o debug and -o errors=panic are mutually exclusive");
1430                 args->ar_errors = result.uint_32;
1431                 break;
1432         case Opt_barrier:
1433                 args->ar_nobarrier = result.boolean;
1434                 break;
1435         case Opt_rgrplvb:
1436                 args->ar_rgrplvb = result.boolean;
1437                 break;
1438         case Opt_loccookie:
1439                 args->ar_loccookie = result.boolean;
1440                 break;
1441         default:
1442                 return invalf(fc, "gfs2: invalid mount option: %s", param->key);
1443         }
1444         return 0;
1445 }
1446
1447 static int gfs2_reconfigure(struct fs_context *fc)
1448 {
1449         struct super_block *sb = fc->root->d_sb;
1450         struct gfs2_sbd *sdp = sb->s_fs_info;
1451         struct gfs2_args *oldargs = &sdp->sd_args;
1452         struct gfs2_args *newargs = fc->fs_private;
1453         struct gfs2_tune *gt = &sdp->sd_tune;
1454         int error = 0;
1455
1456         sync_filesystem(sb);
1457
1458         spin_lock(&gt->gt_spin);
1459         oldargs->ar_commit = gt->gt_logd_secs;
1460         oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1461         if (gt->gt_statfs_slow)
1462                 oldargs->ar_statfs_quantum = 0;
1463         else
1464                 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1465         spin_unlock(&gt->gt_spin);
1466
1467         if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1468                 errorf(fc, "gfs2: reconfiguration of locking protocol not allowed");
1469                 return -EINVAL;
1470         }
1471         if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1472                 errorf(fc, "gfs2: reconfiguration of lock table not allowed");
1473                 return -EINVAL;
1474         }
1475         if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1476                 errorf(fc, "gfs2: reconfiguration of host data not allowed");
1477                 return -EINVAL;
1478         }
1479         if (newargs->ar_spectator != oldargs->ar_spectator) {
1480                 errorf(fc, "gfs2: reconfiguration of spectator mode not allowed");
1481                 return -EINVAL;
1482         }
1483         if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1484                 errorf(fc, "gfs2: reconfiguration of localflocks not allowed");
1485                 return -EINVAL;
1486         }
1487         if (newargs->ar_meta != oldargs->ar_meta) {
1488                 errorf(fc, "gfs2: switching between gfs2 and gfs2meta not allowed");
1489                 return -EINVAL;
1490         }
1491         if (oldargs->ar_spectator)
1492                 fc->sb_flags |= SB_RDONLY;
1493
1494         if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1495                 if (fc->sb_flags & SB_RDONLY) {
1496                         error = gfs2_make_fs_ro(sdp);
1497                         if (error)
1498                                 errorf(fc, "gfs2: unable to remount read-only");
1499                 } else {
1500                         error = gfs2_make_fs_rw(sdp);
1501                         if (error)
1502                                 errorf(fc, "gfs2: unable to remount read-write");
1503                 }
1504         }
1505         sdp->sd_args = *newargs;
1506
1507         if (sdp->sd_args.ar_posix_acl)
1508                 sb->s_flags |= SB_POSIXACL;
1509         else
1510                 sb->s_flags &= ~SB_POSIXACL;
1511         if (sdp->sd_args.ar_nobarrier)
1512                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1513         else
1514                 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1515         spin_lock(&gt->gt_spin);
1516         gt->gt_logd_secs = newargs->ar_commit;
1517         gt->gt_quota_quantum = newargs->ar_quota_quantum;
1518         if (newargs->ar_statfs_quantum) {
1519                 gt->gt_statfs_slow = 0;
1520                 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1521         }
1522         else {
1523                 gt->gt_statfs_slow = 1;
1524                 gt->gt_statfs_quantum = 30;
1525         }
1526         spin_unlock(&gt->gt_spin);
1527
1528         gfs2_online_uevent(sdp);
1529         return error;
1530 }
1531
1532 static const struct fs_context_operations gfs2_context_ops = {
1533         .free        = gfs2_fc_free,
1534         .parse_param = gfs2_parse_param,
1535         .get_tree    = gfs2_get_tree,
1536         .reconfigure = gfs2_reconfigure,
1537 };
1538
1539 /* Set up the filesystem mount context */
1540 static int gfs2_init_fs_context(struct fs_context *fc)
1541 {
1542         struct gfs2_args *args;
1543
1544         args = kmalloc(sizeof(*args), GFP_KERNEL);
1545         if (args == NULL)
1546                 return -ENOMEM;
1547
1548         if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1549                 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1550
1551                 *args = sdp->sd_args;
1552         } else {
1553                 memset(args, 0, sizeof(*args));
1554                 args->ar_quota = GFS2_QUOTA_DEFAULT;
1555                 args->ar_data = GFS2_DATA_DEFAULT;
1556                 args->ar_commit = 30;
1557                 args->ar_statfs_quantum = 30;
1558                 args->ar_quota_quantum = 60;
1559                 args->ar_errors = GFS2_ERRORS_DEFAULT;
1560         }
1561         fc->fs_private = args;
1562         fc->ops = &gfs2_context_ops;
1563         return 0;
1564 }
1565
1566 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1567 {
1568         return -EINVAL;
1569 }
1570
1571 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1572 {
1573         return (fc->sget_key == s->s_bdev);
1574 }
1575
1576 static int gfs2_meta_get_tree(struct fs_context *fc)
1577 {
1578         struct super_block *s;
1579         struct gfs2_sbd *sdp;
1580         struct path path;
1581         int error;
1582
1583         if (!fc->source || !*fc->source)
1584                 return -EINVAL;
1585
1586         error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1587         if (error) {
1588                 pr_warn("path_lookup on %s returned error %d\n",
1589                         fc->source, error);
1590                 return error;
1591         }
1592         fc->fs_type = &gfs2_fs_type;
1593         fc->sget_key = path.dentry->d_sb->s_bdev;
1594         s = sget_fc(fc, test_meta_super, set_meta_super);
1595         path_put(&path);
1596         if (IS_ERR(s)) {
1597                 pr_warn("gfs2 mount does not exist\n");
1598                 return PTR_ERR(s);
1599         }
1600         if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1601                 deactivate_locked_super(s);
1602                 return -EBUSY;
1603         }
1604         sdp = s->s_fs_info;
1605         fc->root = dget(sdp->sd_master_dir);
1606         return 0;
1607 }
1608
1609 static const struct fs_context_operations gfs2_meta_context_ops = {
1610         .free        = gfs2_fc_free,
1611         .get_tree    = gfs2_meta_get_tree,
1612 };
1613
1614 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1615 {
1616         int ret = gfs2_init_fs_context(fc);
1617
1618         if (ret)
1619                 return ret;
1620
1621         fc->ops = &gfs2_meta_context_ops;
1622         return 0;
1623 }
1624
1625 static void gfs2_kill_sb(struct super_block *sb)
1626 {
1627         struct gfs2_sbd *sdp = sb->s_fs_info;
1628
1629         if (sdp == NULL) {
1630                 kill_block_super(sb);
1631                 return;
1632         }
1633
1634         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1635         dput(sdp->sd_root_dir);
1636         dput(sdp->sd_master_dir);
1637         sdp->sd_root_dir = NULL;
1638         sdp->sd_master_dir = NULL;
1639         shrink_dcache_sb(sb);
1640         kill_block_super(sb);
1641 }
1642
1643 struct file_system_type gfs2_fs_type = {
1644         .name = "gfs2",
1645         .fs_flags = FS_REQUIRES_DEV,
1646         .init_fs_context = gfs2_init_fs_context,
1647         .parameters = &gfs2_fs_parameters,
1648         .kill_sb = gfs2_kill_sb,
1649         .owner = THIS_MODULE,
1650 };
1651 MODULE_ALIAS_FS("gfs2");
1652
1653 struct file_system_type gfs2meta_fs_type = {
1654         .name = "gfs2meta",
1655         .fs_flags = FS_REQUIRES_DEV,
1656         .init_fs_context = gfs2_meta_init_fs_context,
1657         .owner = THIS_MODULE,
1658 };
1659 MODULE_ALIAS_FS("gfs2meta");