fs/gfs2/ops_fstype.c

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