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