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