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         if (sb->sb_bsize_shift != ffs(sb->sb_bsize) - 1) {
 182                 pr_warn("Invalid block size shift\n");
 183                 return -EINVAL;
 184         }
 185         return 0;
 186 }
 187
 188 static void end_bio_io_page(struct bio *bio)
 189 {
 190         struct page *page = bio->bi_private;
 191
 192         if (!bio->bi_status)
 193                 SetPageUptodate(page);
 194         else
 195                 pr_warn("error %d reading superblock\n", bio->bi_status);
 196         unlock_page(page);
 197 }
 198
 199 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
 200 {
 201         struct gfs2_sb_host *sb = &sdp->sd_sb;
 202         struct super_block *s = sdp->sd_vfs;
 203         const struct gfs2_sb *str = buf;
 204
 205         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
 206         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
 207         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
 208         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
 209         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
 210         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
 211         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
 212         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
 213         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
 214         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
 215
 216         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
 217         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
 218         memcpy(&s->s_uuid, str->sb_uuid, 16);
 219 }
 220
 221 /**
 222  * gfs2_read_super - Read the gfs2 super block from disk
 223  * @sdp: The GFS2 super block
 224  * @sector: The location of the super block
 225  * @silent: Don't print a message if the check fails
 226  *
 227  * This uses the bio functions to read the super block from disk
 228  * because we want to be 100% sure that we never read cached data.
 229  * A super block is read twice only during each GFS2 mount and is
 230  * never written to by the filesystem. The first time its read no
 231  * locks are held, and the only details which are looked at are those
 232  * relating to the locking protocol. Once locking is up and working,
 233  * the sb is read again under the lock to establish the location of
 234  * the master directory (contains pointers to journals etc) and the
 235  * root directory.
 236  *
 237  * Returns: 0 on success or error
 238  */
 239
 240 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
 241 {
 242         struct super_block *sb = sdp->sd_vfs;
 243         struct gfs2_sb *p;
 244         struct page *page;
 245         struct bio *bio;
 246
 247         page = alloc_page(GFP_NOFS);
 248         if (unlikely(!page))
 249                 return -ENOMEM;
 250
 251         ClearPageUptodate(page);
 252         ClearPageDirty(page);
 253         lock_page(page);
 254
 255         bio = bio_alloc(sb->s_bdev, 1, REQ_OP_READ | REQ_META, GFP_NOFS);
 256         bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
 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         submit_bio(bio);
 262         wait_on_page_locked(page);
 263         bio_put(bio);
 264         if (!PageUptodate(page)) {
 265                 __free_page(page);
 266                 return -EIO;
 267         }
 268         p = kmap(page);
 269         gfs2_sb_in(sdp, p);
 270         kunmap(page);
 271         __free_page(page);
 272         return gfs2_check_sb(sdp, silent);
 273 }
 274
 275 /**
 276  * gfs2_read_sb - Read super block
 277  * @sdp: The GFS2 superblock
 278  * @silent: Don't print message if mount fails
 279  *
 280  */
 281
 282 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
 283 {
 284         u32 hash_blocks, ind_blocks, leaf_blocks;
 285         u32 tmp_blocks;
 286         unsigned int x;
 287         int error;
 288
 289         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 290         if (error) {
 291                 if (!silent)
 292                         fs_err(sdp, "can't read superblock\n");
 293                 return error;
 294         }
 295
 296         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 297                                GFS2_BASIC_BLOCK_SHIFT;
 298         sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
 299         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 300                           sizeof(struct gfs2_dinode)) / sizeof(u64);
 301         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 302                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
 303         sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize -
 304                           sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
 305         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 306         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 307         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 308         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 309         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 310                                 sizeof(struct gfs2_meta_header)) /
 311                                 sizeof(struct gfs2_quota_change);
 312         sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
 313                                      sizeof(struct gfs2_meta_header))
 314                 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
 315
 316         /*
 317          * We always keep at least one block reserved for revokes in
 318          * transactions.  This greatly simplifies allocating additional
 319          * revoke blocks.
 320          */
 321         atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs);
 322
 323         /* Compute maximum reservation required to add a entry to a directory */
 324
 325         hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
 326                              sdp->sd_jbsize);
 327
 328         ind_blocks = 0;
 329         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
 330                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
 331                 ind_blocks += tmp_blocks;
 332         }
 333
 334         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
 335
 336         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
 337
 338         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
 339                                 sizeof(struct gfs2_dinode);
 340         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
 341         for (x = 2;; x++) {
 342                 u64 space, d;
 343                 u32 m;
 344
 345                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
 346                 d = space;
 347                 m = do_div(d, sdp->sd_inptrs);
 348
 349                 if (d != sdp->sd_heightsize[x - 1] || m)
 350                         break;
 351                 sdp->sd_heightsize[x] = space;
 352         }
 353         sdp->sd_max_height = x;
 354         sdp->sd_heightsize[x] = ~0;
 355         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
 356
 357         sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
 358                                       sizeof(struct gfs2_leaf)) /
 359                                      GFS2_MIN_DIRENT_SIZE;
 360         return 0;
 361 }
 362
 363 static int init_names(struct gfs2_sbd *sdp, int silent)
 364 {
 365         char *proto, *table;
 366         int error = 0;
 367
 368         proto = sdp->sd_args.ar_lockproto;
 369         table = sdp->sd_args.ar_locktable;
 370
 371         /*  Try to autodetect  */
 372
 373         if (!proto[0] || !table[0]) {
 374                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 375                 if (error)
 376                         return error;
 377
 378                 if (!proto[0])
 379                         proto = sdp->sd_sb.sb_lockproto;
 380                 if (!table[0])
 381                         table = sdp->sd_sb.sb_locktable;
 382         }
 383
 384         if (!table[0])
 385                 table = sdp->sd_vfs->s_id;
 386
 387         BUILD_BUG_ON(GFS2_LOCKNAME_LEN > GFS2_FSNAME_LEN);
 388
 389         strscpy(sdp->sd_proto_name, proto, GFS2_LOCKNAME_LEN);
 390         strscpy(sdp->sd_table_name, table, GFS2_LOCKNAME_LEN);
 391
 392         table = sdp->sd_table_name;
 393         while ((table = strchr(table, '/')))
 394                 *table = '_';
 395
 396         return error;
 397 }
 398
 399 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 400                         int undo)
 401 {
 402         int error = 0;
 403
 404         if (undo)
 405                 goto fail_trans;
 406
 407         error = gfs2_glock_nq_num(sdp,
 408                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 409                                   LM_ST_EXCLUSIVE,
 410                                   LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
 411                                   mount_gh);
 412         if (error) {
 413                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 414                 goto fail;
 415         }
 416
 417         error = gfs2_glock_nq_num(sdp,
 418                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 419                                   LM_ST_SHARED,
 420                                   LM_FLAG_NOEXP | GL_EXACT | GL_NOPID,
 421                                   &sdp->sd_live_gh);
 422         if (error) {
 423                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 424                 goto fail_mount;
 425         }
 426
 427         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 428                                CREATE, &sdp->sd_rename_gl);
 429         if (error) {
 430                 fs_err(sdp, "can't create rename glock: %d\n", error);
 431                 goto fail_live;
 432         }
 433
 434         error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
 435                                CREATE, &sdp->sd_freeze_gl);
 436         if (error) {
 437                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 438                 goto fail_rename;
 439         }
 440
 441         return 0;
 442
 443 fail_trans:
 444         gfs2_glock_put(sdp->sd_freeze_gl);
 445 fail_rename:
 446         gfs2_glock_put(sdp->sd_rename_gl);
 447 fail_live:
 448         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 449 fail_mount:
 450         gfs2_glock_dq_uninit(mount_gh);
 451 fail:
 452         return error;
 453 }
 454
 455 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
 456                             u64 no_addr, const char *name)
 457 {
 458         struct gfs2_sbd *sdp = sb->s_fs_info;
 459         struct dentry *dentry;
 460         struct inode *inode;
 461
 462         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
 463                                   GFS2_BLKST_FREE /* ignore */);
 464         if (IS_ERR(inode)) {
 465                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
 466                 return PTR_ERR(inode);
 467         }
 468         dentry = d_make_root(inode);
 469         if (!dentry) {
 470                 fs_err(sdp, "can't alloc %s dentry\n", name);
 471                 return -ENOMEM;
 472         }
 473         *dptr = dentry;
 474         return 0;
 475 }
 476
 477 static int init_sb(struct gfs2_sbd *sdp, int silent)
 478 {
 479         struct super_block *sb = sdp->sd_vfs;
 480         struct gfs2_holder sb_gh;
 481         u64 no_addr;
 482         int ret;
 483
 484         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 485                                 LM_ST_SHARED, 0, &sb_gh);
 486         if (ret) {
 487                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
 488                 return ret;
 489         }
 490
 491         ret = gfs2_read_sb(sdp, silent);
 492         if (ret) {
 493                 fs_err(sdp, "can't read superblock: %d\n", ret);
 494                 goto out;
 495         }
 496
 497         switch(sdp->sd_sb.sb_fs_format) {
 498         case GFS2_FS_FORMAT_MAX:
 499                 sb->s_xattr = gfs2_xattr_handlers_max;
 500                 break;
 501
 502         case GFS2_FS_FORMAT_MIN:
 503                 sb->s_xattr = gfs2_xattr_handlers_min;
 504                 break;
 505
 506         default:
 507                 BUG();
 508         }
 509
 510         /* Set up the buffer cache and SB for real */
 511         if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
 512                 ret = -EINVAL;
 513                 fs_err(sdp, "FS block size (%u) is too small for device "
 514                        "block size (%u)\n",
 515                        sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
 516                 goto out;
 517         }
 518         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 519                 ret = -EINVAL;
 520                 fs_err(sdp, "FS block size (%u) is too big for machine "
 521                        "page size (%u)\n",
 522                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 523                 goto out;
 524         }
 525         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 526
 527         /* Get the root inode */
 528         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 529         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 530         if (ret)
 531                 goto out;
 532
 533         /* Get the master inode */
 534         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 535         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 536         if (ret) {
 537                 dput(sdp->sd_root_dir);
 538                 goto out;
 539         }
 540         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 541 out:
 542         gfs2_glock_dq_uninit(&sb_gh);
 543         return ret;
 544 }
 545
 546 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
 547 {
 548         char *message = "FIRSTMOUNT=Done";
 549         char *envp[] = { message, NULL };
 550
 551         fs_info(sdp, "first mount done, others may mount\n");
 552
 553         if (sdp->sd_lockstruct.ls_ops->lm_first_done)
 554                 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
 555
 556         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
 557 }
 558
 559 /**
 560  * gfs2_jindex_hold - Grab a lock on the jindex
 561  * @sdp: The GFS2 superblock
 562  * @ji_gh: the holder for the jindex glock
 563  *
 564  * Returns: errno
 565  */
 566
 567 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 568 {
 569         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
 570         struct qstr name;
 571         char buf[20];
 572         struct gfs2_jdesc *jd;
 573         int error;
 574
 575         name.name = buf;
 576
 577         mutex_lock(&sdp->sd_jindex_mutex);
 578
 579         for (;;) {
 580                 struct gfs2_inode *jip;
 581
 582                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
 583                 if (error)
 584                         break;
 585
 586                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
 587                 name.hash = gfs2_disk_hash(name.name, name.len);
 588
 589                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
 590                 if (error == -ENOENT) {
 591                         error = 0;
 592                         break;
 593                 }
 594
 595                 gfs2_glock_dq_uninit(ji_gh);
 596
 597                 if (error)
 598                         break;
 599
 600                 error = -ENOMEM;
 601                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
 602                 if (!jd)
 603                         break;
 604
 605                 INIT_LIST_HEAD(&jd->extent_list);
 606                 INIT_LIST_HEAD(&jd->jd_revoke_list);
 607
 608                 INIT_WORK(&jd->jd_work, gfs2_recover_func);
 609                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
 610                 if (IS_ERR_OR_NULL(jd->jd_inode)) {
 611                         if (!jd->jd_inode)
 612                                 error = -ENOENT;
 613                         else
 614                                 error = PTR_ERR(jd->jd_inode);
 615                         kfree(jd);
 616                         break;
 617                 }
 618
 619                 d_mark_dontcache(jd->jd_inode);
 620                 spin_lock(&sdp->sd_jindex_spin);
 621                 jd->jd_jid = sdp->sd_journals++;
 622                 jip = GFS2_I(jd->jd_inode);
 623                 jd->jd_no_addr = jip->i_no_addr;
 624                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
 625                 spin_unlock(&sdp->sd_jindex_spin);
 626         }
 627
 628         mutex_unlock(&sdp->sd_jindex_mutex);
 629
 630         return error;
 631 }
 632
 633 /**
 634  * init_statfs - look up and initialize master and local (per node) statfs inodes
 635  * @sdp: The GFS2 superblock
 636  *
 637  * This should be called after the jindex is initialized in init_journal() and
 638  * before gfs2_journal_recovery() is called because we need to be able to write
 639  * to these inodes during recovery.
 640  *
 641  * Returns: errno
 642  */
 643 static int init_statfs(struct gfs2_sbd *sdp)
 644 {
 645         int error = 0;
 646         struct inode *master = d_inode(sdp->sd_master_dir);
 647         struct inode *pn = NULL;
 648         char buf[30];
 649         struct gfs2_jdesc *jd;
 650         struct gfs2_inode *ip;
 651
 652         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 653         if (IS_ERR(sdp->sd_statfs_inode)) {
 654                 error = PTR_ERR(sdp->sd_statfs_inode);
 655                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 656                 goto out;
 657         }
 658         if (sdp->sd_args.ar_spectator)
 659                 goto out;
 660
 661         pn = gfs2_lookup_simple(master, "per_node");
 662         if (IS_ERR(pn)) {
 663                 error = PTR_ERR(pn);
 664                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 665                 goto put_statfs;
 666         }
 667
 668         /* For each jid, lookup the corresponding local statfs inode in the
 669          * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */
 670         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 671                 struct local_statfs_inode *lsi =
 672                         kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS);
 673                 if (!lsi) {
 674                         error = -ENOMEM;
 675                         goto free_local;
 676                 }
 677                 sprintf(buf, "statfs_change%u", jd->jd_jid);
 678                 lsi->si_sc_inode = gfs2_lookup_simple(pn, buf);
 679                 if (IS_ERR(lsi->si_sc_inode)) {
 680                         error = PTR_ERR(lsi->si_sc_inode);
 681                         fs_err(sdp, "can't find local \"sc\" file#%u: %d\n",
 682                                jd->jd_jid, error);
 683                         kfree(lsi);
 684                         goto free_local;
 685                 }
 686                 lsi->si_jid = jd->jd_jid;
 687                 if (jd->jd_jid == sdp->sd_jdesc->jd_jid)
 688                         sdp->sd_sc_inode = lsi->si_sc_inode;
 689
 690                 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list);
 691         }
 692
 693         iput(pn);
 694         pn = NULL;
 695         ip = GFS2_I(sdp->sd_sc_inode);
 696         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
 697                                    &sdp->sd_sc_gh);
 698         if (error) {
 699                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 700                 goto free_local;
 701         }
 702         /* read in the local statfs buffer - other nodes don't change it. */
 703         error = gfs2_meta_inode_buffer(ip, &sdp->sd_sc_bh);
 704         if (error) {
 705                 fs_err(sdp, "Cannot read in local statfs: %d\n", error);
 706                 goto unlock_sd_gh;
 707         }
 708         return 0;
 709
 710 unlock_sd_gh:
 711         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 712 free_local:
 713         free_local_statfs_inodes(sdp);
 714         iput(pn);
 715 put_statfs:
 716         iput(sdp->sd_statfs_inode);
 717 out:
 718         return error;
 719 }
 720
 721 /* Uninitialize and free up memory used by the list of statfs inodes */
 722 static void uninit_statfs(struct gfs2_sbd *sdp)
 723 {
 724         if (!sdp->sd_args.ar_spectator) {
 725                 brelse(sdp->sd_sc_bh);
 726                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 727                 free_local_statfs_inodes(sdp);
 728         }
 729         iput(sdp->sd_statfs_inode);
 730 }
 731
 732 static int init_journal(struct gfs2_sbd *sdp, int undo)
 733 {
 734         struct inode *master = d_inode(sdp->sd_master_dir);
 735         struct gfs2_holder ji_gh;
 736         struct gfs2_inode *ip;
 737         int jindex = 1;
 738         int error = 0;
 739
 740         if (undo) {
 741                 jindex = 0;
 742                 goto fail_statfs;
 743         }
 744
 745         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
 746         if (IS_ERR(sdp->sd_jindex)) {
 747                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 748                 return PTR_ERR(sdp->sd_jindex);
 749         }
 750
 751         /* Load in the journal index special file */
 752
 753         error = gfs2_jindex_hold(sdp, &ji_gh);
 754         if (error) {
 755                 fs_err(sdp, "can't read journal index: %d\n", error);
 756                 goto fail;
 757         }
 758
 759         error = -EUSERS;
 760         if (!gfs2_jindex_size(sdp)) {
 761                 fs_err(sdp, "no journals!\n");
 762                 goto fail_jindex;
 763         }
 764
 765         atomic_set(&sdp->sd_log_blks_needed, 0);
 766         if (sdp->sd_args.ar_spectator) {
 767                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 768                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 769                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 770                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 771         } else {
 772                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 773                         fs_err(sdp, "can't mount journal #%u\n",
 774                                sdp->sd_lockstruct.ls_jid);
 775                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 776                                gfs2_jindex_size(sdp),
 777                                gfs2_jindex_size(sdp) - 1);
 778                         goto fail_jindex;
 779                 }
 780                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 781
 782                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 783                                           &gfs2_journal_glops,
 784                                           LM_ST_EXCLUSIVE,
 785                                           LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
 786                                           &sdp->sd_journal_gh);
 787                 if (error) {
 788                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 789                         goto fail_jindex;
 790                 }
 791
 792                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 793                 sdp->sd_jinode_gl = ip->i_gl;
 794                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 795                                            LM_FLAG_NOEXP | GL_EXACT |
 796                                            GL_NOCACHE | GL_NOPID,
 797                                            &sdp->sd_jinode_gh);
 798                 if (error) {
 799                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 800                                error);
 801                         goto fail_journal_gh;
 802                 }
 803
 804                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 805                 if (error) {
 806                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 807                                sdp->sd_jdesc->jd_jid, error);
 808                         goto fail_jinode_gh;
 809                 }
 810                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 811                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 812                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 813
 814                 /* Map the extents for this journal's blocks */
 815                 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
 816         }
 817         trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
 818
 819         /* Lookup statfs inodes here so journal recovery can use them. */
 820         error = init_statfs(sdp);
 821         if (error)
 822                 goto fail_jinode_gh;
 823
 824         if (sdp->sd_lockstruct.ls_first) {
 825                 unsigned int x;
 826                 for (x = 0; x < sdp->sd_journals; x++) {
 827                         struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
 828
 829                         if (sdp->sd_args.ar_spectator) {
 830                                 error = check_journal_clean(sdp, jd, true);
 831                                 if (error)
 832                                         goto fail_statfs;
 833                                 continue;
 834                         }
 835                         error = gfs2_recover_journal(jd, true);
 836                         if (error) {
 837                                 fs_err(sdp, "error recovering journal %u: %d\n",
 838                                        x, error);
 839                                 goto fail_statfs;
 840                         }
 841                 }
 842
 843                 gfs2_others_may_mount(sdp);
 844         } else if (!sdp->sd_args.ar_spectator) {
 845                 error = gfs2_recover_journal(sdp->sd_jdesc, true);
 846                 if (error) {
 847                         fs_err(sdp, "error recovering my journal: %d\n", error);
 848                         goto fail_statfs;
 849                 }
 850         }
 851
 852         sdp->sd_log_idle = 1;
 853         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 854         gfs2_glock_dq_uninit(&ji_gh);
 855         jindex = 0;
 856         INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
 857         return 0;
 858
 859 fail_statfs:
 860         uninit_statfs(sdp);
 861 fail_jinode_gh:
 862         /* A withdraw may have done dq/uninit so now we need to check it */
 863         if (!sdp->sd_args.ar_spectator &&
 864             gfs2_holder_initialized(&sdp->sd_jinode_gh))
 865                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 866 fail_journal_gh:
 867         if (!sdp->sd_args.ar_spectator &&
 868             gfs2_holder_initialized(&sdp->sd_journal_gh))
 869                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 870 fail_jindex:
 871         gfs2_jindex_free(sdp);
 872         if (jindex)
 873                 gfs2_glock_dq_uninit(&ji_gh);
 874 fail:
 875         iput(sdp->sd_jindex);
 876         return error;
 877 }
 878
 879 static struct lock_class_key gfs2_quota_imutex_key;
 880
 881 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 882 {
 883         int error = 0;
 884         struct inode *master = d_inode(sdp->sd_master_dir);
 885
 886         if (undo)
 887                 goto fail_qinode;
 888
 889         error = init_journal(sdp, undo);
 890         complete_all(&sdp->sd_journal_ready);
 891         if (error)
 892                 goto fail;
 893
 894         /* Read in the resource index inode */
 895         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 896         if (IS_ERR(sdp->sd_rindex)) {
 897                 error = PTR_ERR(sdp->sd_rindex);
 898                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 899                 goto fail_journal;
 900         }
 901         sdp->sd_rindex_uptodate = 0;
 902
 903         /* Read in the quota inode */
 904         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 905         if (IS_ERR(sdp->sd_quota_inode)) {
 906                 error = PTR_ERR(sdp->sd_quota_inode);
 907                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 908                 goto fail_rindex;
 909         }
 910         /*
 911          * i_rwsem on quota files is special. Since this inode is hidden system
 912          * file, we are safe to define locking ourselves.
 913          */
 914         lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
 915                           &gfs2_quota_imutex_key);
 916
 917         error = gfs2_rindex_update(sdp);
 918         if (error)
 919                 goto fail_qinode;
 920
 921         return 0;
 922
 923 fail_qinode:
 924         iput(sdp->sd_quota_inode);
 925 fail_rindex:
 926         gfs2_clear_rgrpd(sdp);
 927         iput(sdp->sd_rindex);
 928 fail_journal:
 929         init_journal(sdp, UNDO);
 930 fail:
 931         return error;
 932 }
 933
 934 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 935 {
 936         struct inode *pn = NULL;
 937         char buf[30];
 938         int error = 0;
 939         struct gfs2_inode *ip;
 940         struct inode *master = d_inode(sdp->sd_master_dir);
 941
 942         if (sdp->sd_args.ar_spectator)
 943                 return 0;
 944
 945         if (undo)
 946                 goto fail_qc_gh;
 947
 948         pn = gfs2_lookup_simple(master, "per_node");
 949         if (IS_ERR(pn)) {
 950                 error = PTR_ERR(pn);
 951                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 952                 return error;
 953         }
 954
 955         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 956         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 957         if (IS_ERR(sdp->sd_qc_inode)) {
 958                 error = PTR_ERR(sdp->sd_qc_inode);
 959                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 960                 goto fail_ut_i;
 961         }
 962
 963         iput(pn);
 964         pn = NULL;
 965
 966         ip = GFS2_I(sdp->sd_qc_inode);
 967         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
 968                                    &sdp->sd_qc_gh);
 969         if (error) {
 970                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 971                 goto fail_qc_i;
 972         }
 973
 974         return 0;
 975
 976 fail_qc_gh:
 977         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 978 fail_qc_i:
 979         iput(sdp->sd_qc_inode);
 980 fail_ut_i:
 981         iput(pn);
 982         return error;
 983 }
 984
 985 static const match_table_t nolock_tokens = {
 986         { Opt_jid, "jid=%d", },
 987         { Opt_err, NULL },
 988 };
 989
 990 static const struct lm_lockops nolock_ops = {
 991         .lm_proto_name = "lock_nolock",
 992         .lm_put_lock = gfs2_glock_free,
 993         .lm_tokens = &nolock_tokens,
 994 };
 995
 996 /**
 997  * gfs2_lm_mount - mount a locking protocol
 998  * @sdp: the filesystem
 999  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
1000  *
1001  * Returns: errno
1002  */
1003
1004 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1005 {
1006         const struct lm_lockops *lm;
1007         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1008         struct gfs2_args *args = &sdp->sd_args;
1009         const char *proto = sdp->sd_proto_name;
1010         const char *table = sdp->sd_table_name;
1011         char *o, *options;
1012         int ret;
1013
1014         if (!strcmp("lock_nolock", proto)) {
1015                 lm = &nolock_ops;
1016                 sdp->sd_args.ar_localflocks = 1;
1017 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1018         } else if (!strcmp("lock_dlm", proto)) {
1019                 lm = &gfs2_dlm_ops;
1020 #endif
1021         } else {
1022                 pr_info("can't find protocol %s\n", proto);
1023                 return -ENOENT;
1024         }
1025
1026         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1027
1028         ls->ls_ops = lm;
1029         ls->ls_first = 1;
1030
1031         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1032                 substring_t tmp[MAX_OPT_ARGS];
1033                 int token, option;
1034
1035                 if (!o || !*o)
1036                         continue;
1037
1038                 token = match_token(o, *lm->lm_tokens, tmp);
1039                 switch (token) {
1040                 case Opt_jid:
1041                         ret = match_int(&tmp[0], &option);
1042                         if (ret || option < 0)
1043                                 goto hostdata_error;
1044                         if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1045                                 ls->ls_jid = option;
1046                         break;
1047                 case Opt_id:
1048                 case Opt_nodir:
1049                         /* Obsolete, but left for backward compat purposes */
1050                         break;
1051                 case Opt_first:
1052                         ret = match_int(&tmp[0], &option);
1053                         if (ret || (option != 0 && option != 1))
1054                                 goto hostdata_error;
1055                         ls->ls_first = option;
1056                         break;
1057                 case Opt_err:
1058                 default:
1059 hostdata_error:
1060                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1061                         return -EINVAL;
1062                 }
1063         }
1064
1065         if (lm->lm_mount == NULL) {
1066                 fs_info(sdp, "Now mounting FS (format %u)...\n", sdp->sd_sb.sb_fs_format);
1067                 complete_all(&sdp->sd_locking_init);
1068                 return 0;
1069         }
1070         ret = lm->lm_mount(sdp, table);
1071         if (ret == 0)
1072                 fs_info(sdp, "Joined cluster. Now mounting FS (format %u)...\n",
1073                         sdp->sd_sb.sb_fs_format);
1074         complete_all(&sdp->sd_locking_init);
1075         return ret;
1076 }
1077
1078 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1079 {
1080         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1081         if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount)
1082                 lm->lm_unmount(sdp);
1083 }
1084
1085 static int wait_on_journal(struct gfs2_sbd *sdp)
1086 {
1087         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1088                 return 0;
1089
1090         return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1091                 ? -EINTR : 0;
1092 }
1093
1094 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1095 {
1096         struct super_block *sb = sdp->sd_vfs;
1097         char ro[20];
1098         char spectator[20];
1099         char *envp[] = { ro, spectator, NULL };
1100         sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1101         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1102         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1103 }
1104
1105 static int init_threads(struct gfs2_sbd *sdp)
1106 {
1107         struct task_struct *p;
1108         int error = 0;
1109
1110         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
1111         if (IS_ERR(p)) {
1112                 error = PTR_ERR(p);
1113                 fs_err(sdp, "can't start logd thread: %d\n", error);
1114                 return error;
1115         }
1116         sdp->sd_logd_process = p;
1117
1118         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
1119         if (IS_ERR(p)) {
1120                 error = PTR_ERR(p);
1121                 fs_err(sdp, "can't start quotad thread: %d\n", error);
1122                 goto fail;
1123         }
1124         sdp->sd_quotad_process = p;
1125         return 0;
1126
1127 fail:
1128         kthread_stop(sdp->sd_logd_process);
1129         sdp->sd_logd_process = NULL;
1130         return error;
1131 }
1132
1133 /**
1134  * gfs2_fill_super - Read in superblock
1135  * @sb: The VFS superblock
1136  * @fc: Mount options and flags
1137  *
1138  * Returns: -errno
1139  */
1140 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1141 {
1142         struct gfs2_args *args = fc->fs_private;
1143         int silent = fc->sb_flags & SB_SILENT;
1144         struct gfs2_sbd *sdp;
1145         struct gfs2_holder mount_gh;
1146         struct gfs2_holder freeze_gh;
1147         int error;
1148
1149         sdp = init_sbd(sb);
1150         if (!sdp) {
1151                 pr_warn("can't alloc struct gfs2_sbd\n");
1152                 return -ENOMEM;
1153         }
1154         sdp->sd_args = *args;
1155
1156         if (sdp->sd_args.ar_spectator) {
1157                 sb->s_flags |= SB_RDONLY;
1158                 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1159         }
1160         if (sdp->sd_args.ar_posix_acl)
1161                 sb->s_flags |= SB_POSIXACL;
1162         if (sdp->sd_args.ar_nobarrier)
1163                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1164
1165         sb->s_flags |= SB_NOSEC;
1166         sb->s_magic = GFS2_MAGIC;
1167         sb->s_op = &gfs2_super_ops;
1168         sb->s_d_op = &gfs2_dops;
1169         sb->s_export_op = &gfs2_export_ops;
1170         sb->s_qcop = &gfs2_quotactl_ops;
1171         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1172         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1173         sb->s_time_gran = 1;
1174         sb->s_maxbytes = MAX_LFS_FILESIZE;
1175
1176         /* Set up the buffer cache and fill in some fake block size values
1177            to allow us to read-in the on-disk superblock. */
1178         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1179         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1180         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1181                                GFS2_BASIC_BLOCK_SHIFT;
1182         sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1183
1184         sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1185         sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1186         if (sdp->sd_args.ar_statfs_quantum) {
1187                 sdp->sd_tune.gt_statfs_slow = 0;
1188                 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1189         } else {
1190                 sdp->sd_tune.gt_statfs_slow = 1;
1191                 sdp->sd_tune.gt_statfs_quantum = 30;
1192         }
1193
1194         error = init_names(sdp, silent);
1195         if (error)
1196                 goto fail_free;
1197
1198         snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1199
1200         error = gfs2_sys_fs_add(sdp);
1201         if (error)
1202                 goto fail_free;
1203
1204         gfs2_create_debugfs_file(sdp);
1205
1206         error = gfs2_lm_mount(sdp, silent);
1207         if (error)
1208                 goto fail_debug;
1209
1210         error = init_locking(sdp, &mount_gh, DO);
1211         if (error)
1212                 goto fail_lm;
1213
1214         error = init_sb(sdp, silent);
1215         if (error)
1216                 goto fail_locking;
1217
1218         /* Turn rgrplvb on by default if fs format is recent enough */
1219         if (!sdp->sd_args.ar_got_rgrplvb && sdp->sd_sb.sb_fs_format > 1801)
1220                 sdp->sd_args.ar_rgrplvb = 1;
1221
1222         error = wait_on_journal(sdp);
1223         if (error)
1224                 goto fail_sb;
1225
1226         /*
1227          * If user space has failed to join the cluster or some similar
1228          * failure has occurred, then the journal id will contain a
1229          * negative (error) number. This will then be returned to the
1230          * caller (of the mount syscall). We do this even for spectator
1231          * mounts (which just write a jid of 0 to indicate "ok" even though
1232          * the jid is unused in the spectator case)
1233          */
1234         if (sdp->sd_lockstruct.ls_jid < 0) {
1235                 error = sdp->sd_lockstruct.ls_jid;
1236                 sdp->sd_lockstruct.ls_jid = 0;
1237                 goto fail_sb;
1238         }
1239
1240         if (sdp->sd_args.ar_spectator)
1241                 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1242                          sdp->sd_table_name);
1243         else
1244                 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1245                          sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1246
1247         error = init_inodes(sdp, DO);
1248         if (error)
1249                 goto fail_sb;
1250
1251         error = init_per_node(sdp, DO);
1252         if (error)
1253                 goto fail_inodes;
1254
1255         error = gfs2_statfs_init(sdp);
1256         if (error) {
1257                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1258                 goto fail_per_node;
1259         }
1260
1261         if (!sb_rdonly(sb)) {
1262                 error = init_threads(sdp);
1263                 if (error) {
1264                         gfs2_withdraw_delayed(sdp);
1265                         goto fail_per_node;
1266                 }
1267         }
1268
1269         error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
1270         if (error)
1271                 goto fail_per_node;
1272
1273         if (!sb_rdonly(sb))
1274                 error = gfs2_make_fs_rw(sdp);
1275
1276         gfs2_freeze_unlock(&freeze_gh);
1277         if (error) {
1278                 if (sdp->sd_quotad_process)
1279                         kthread_stop(sdp->sd_quotad_process);
1280                 sdp->sd_quotad_process = NULL;
1281                 if (sdp->sd_logd_process)
1282                         kthread_stop(sdp->sd_logd_process);
1283                 sdp->sd_logd_process = NULL;
1284                 fs_err(sdp, "can't make FS RW: %d\n", error);
1285                 goto fail_per_node;
1286         }
1287         gfs2_glock_dq_uninit(&mount_gh);
1288         gfs2_online_uevent(sdp);
1289         return 0;
1290
1291 fail_per_node:
1292         init_per_node(sdp, UNDO);
1293 fail_inodes:
1294         init_inodes(sdp, UNDO);
1295 fail_sb:
1296         if (sdp->sd_root_dir)
1297                 dput(sdp->sd_root_dir);
1298         if (sdp->sd_master_dir)
1299                 dput(sdp->sd_master_dir);
1300         if (sb->s_root)
1301                 dput(sb->s_root);
1302         sb->s_root = NULL;
1303 fail_locking:
1304         init_locking(sdp, &mount_gh, UNDO);
1305 fail_lm:
1306         complete_all(&sdp->sd_journal_ready);
1307         gfs2_gl_hash_clear(sdp);
1308         gfs2_lm_unmount(sdp);
1309 fail_debug:
1310         gfs2_delete_debugfs_file(sdp);
1311         gfs2_sys_fs_del(sdp);
1312 fail_free:
1313         free_sbd(sdp);
1314         sb->s_fs_info = NULL;
1315         return error;
1316 }
1317
1318 /**
1319  * gfs2_get_tree - Get the GFS2 superblock and root directory
1320  * @fc: The filesystem context
1321  *
1322  * Returns: 0 or -errno on error
1323  */
1324 static int gfs2_get_tree(struct fs_context *fc)
1325 {
1326         struct gfs2_args *args = fc->fs_private;
1327         struct gfs2_sbd *sdp;
1328         int error;
1329
1330         error = get_tree_bdev(fc, gfs2_fill_super);
1331         if (error)
1332                 return error;
1333
1334         sdp = fc->root->d_sb->s_fs_info;
1335         dput(fc->root);
1336         if (args->ar_meta)
1337                 fc->root = dget(sdp->sd_master_dir);
1338         else
1339                 fc->root = dget(sdp->sd_root_dir);
1340         return 0;
1341 }
1342
1343 static void gfs2_fc_free(struct fs_context *fc)
1344 {
1345         struct gfs2_args *args = fc->fs_private;
1346
1347         kfree(args);
1348 }
1349
1350 enum gfs2_param {
1351         Opt_lockproto,
1352         Opt_locktable,
1353         Opt_hostdata,
1354         Opt_spectator,
1355         Opt_ignore_local_fs,
1356         Opt_localflocks,
1357         Opt_localcaching,
1358         Opt_debug,
1359         Opt_upgrade,
1360         Opt_acl,
1361         Opt_quota,
1362         Opt_quota_flag,
1363         Opt_suiddir,
1364         Opt_data,
1365         Opt_meta,
1366         Opt_discard,
1367         Opt_commit,
1368         Opt_errors,
1369         Opt_statfs_quantum,
1370         Opt_statfs_percent,
1371         Opt_quota_quantum,
1372         Opt_barrier,
1373         Opt_rgrplvb,
1374         Opt_loccookie,
1375 };
1376
1377 static const struct constant_table gfs2_param_quota[] = {
1378         {"off",        GFS2_QUOTA_OFF},
1379         {"account",    GFS2_QUOTA_ACCOUNT},
1380         {"on",         GFS2_QUOTA_ON},
1381         {}
1382 };
1383
1384 enum opt_data {
1385         Opt_data_writeback = GFS2_DATA_WRITEBACK,
1386         Opt_data_ordered   = GFS2_DATA_ORDERED,
1387 };
1388
1389 static const struct constant_table gfs2_param_data[] = {
1390         {"writeback",  Opt_data_writeback },
1391         {"ordered",    Opt_data_ordered },
1392         {}
1393 };
1394
1395 enum opt_errors {
1396         Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1397         Opt_errors_panic    = GFS2_ERRORS_PANIC,
1398 };
1399
1400 static const struct constant_table gfs2_param_errors[] = {
1401         {"withdraw",   Opt_errors_withdraw },
1402         {"panic",      Opt_errors_panic },
1403         {}
1404 };
1405
1406 static const struct fs_parameter_spec gfs2_fs_parameters[] = {
1407         fsparam_string ("lockproto",          Opt_lockproto),
1408         fsparam_string ("locktable",          Opt_locktable),
1409         fsparam_string ("hostdata",           Opt_hostdata),
1410         fsparam_flag   ("spectator",          Opt_spectator),
1411         fsparam_flag   ("norecovery",         Opt_spectator),
1412         fsparam_flag   ("ignore_local_fs",    Opt_ignore_local_fs),
1413         fsparam_flag   ("localflocks",        Opt_localflocks),
1414         fsparam_flag   ("localcaching",       Opt_localcaching),
1415         fsparam_flag_no("debug",              Opt_debug),
1416         fsparam_flag   ("upgrade",            Opt_upgrade),
1417         fsparam_flag_no("acl",                Opt_acl),
1418         fsparam_flag_no("suiddir",            Opt_suiddir),
1419         fsparam_enum   ("data",               Opt_data, gfs2_param_data),
1420         fsparam_flag   ("meta",               Opt_meta),
1421         fsparam_flag_no("discard",            Opt_discard),
1422         fsparam_s32    ("commit",             Opt_commit),
1423         fsparam_enum   ("errors",             Opt_errors, gfs2_param_errors),
1424         fsparam_s32    ("statfs_quantum",     Opt_statfs_quantum),
1425         fsparam_s32    ("statfs_percent",     Opt_statfs_percent),
1426         fsparam_s32    ("quota_quantum",      Opt_quota_quantum),
1427         fsparam_flag_no("barrier",            Opt_barrier),
1428         fsparam_flag_no("rgrplvb",            Opt_rgrplvb),
1429         fsparam_flag_no("loccookie",          Opt_loccookie),
1430         /* quota can be a flag or an enum so it gets special treatment */
1431         fsparam_flag_no("quota",              Opt_quota_flag),
1432         fsparam_enum("quota",                 Opt_quota, gfs2_param_quota),
1433         {}
1434 };
1435
1436 /* Parse a single mount parameter */
1437 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1438 {
1439         struct gfs2_args *args = fc->fs_private;
1440         struct fs_parse_result result;
1441         int o;
1442
1443         o = fs_parse(fc, gfs2_fs_parameters, param, &result);
1444         if (o < 0)
1445                 return o;
1446
1447         switch (o) {
1448         case Opt_lockproto:
1449                 strscpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1450                 break;
1451         case Opt_locktable:
1452                 strscpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1453                 break;
1454         case Opt_hostdata:
1455                 strscpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1456                 break;
1457         case Opt_spectator:
1458                 args->ar_spectator = 1;
1459                 break;
1460         case Opt_ignore_local_fs:
1461                 /* Retained for backwards compat only */
1462                 break;
1463         case Opt_localflocks:
1464                 args->ar_localflocks = 1;
1465                 break;
1466         case Opt_localcaching:
1467                 /* Retained for backwards compat only */
1468                 break;
1469         case Opt_debug:
1470                 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1471                         return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1472                 args->ar_debug = result.boolean;
1473                 break;
1474         case Opt_upgrade:
1475                 /* Retained for backwards compat only */
1476                 break;
1477         case Opt_acl:
1478                 args->ar_posix_acl = result.boolean;
1479                 break;
1480         case Opt_quota_flag:
1481                 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON;
1482                 break;
1483         case Opt_quota:
1484                 args->ar_quota = result.int_32;
1485                 break;
1486         case Opt_suiddir:
1487                 args->ar_suiddir = result.boolean;
1488                 break;
1489         case Opt_data:
1490                 /* The uint_32 result maps directly to GFS2_DATA_* */
1491                 args->ar_data = result.uint_32;
1492                 break;
1493         case Opt_meta:
1494                 args->ar_meta = 1;
1495                 break;
1496         case Opt_discard:
1497                 args->ar_discard = result.boolean;
1498                 break;
1499         case Opt_commit:
1500                 if (result.int_32 <= 0)
1501                         return invalfc(fc, "commit mount option requires a positive numeric argument");
1502                 args->ar_commit = result.int_32;
1503                 break;
1504         case Opt_statfs_quantum:
1505                 if (result.int_32 < 0)
1506                         return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument");
1507                 args->ar_statfs_quantum = result.int_32;
1508                 break;
1509         case Opt_quota_quantum:
1510                 if (result.int_32 <= 0)
1511                         return invalfc(fc, "quota_quantum mount option requires a positive numeric argument");
1512                 args->ar_quota_quantum = result.int_32;
1513                 break;
1514         case Opt_statfs_percent:
1515                 if (result.int_32 < 0 || result.int_32 > 100)
1516                         return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100");
1517                 args->ar_statfs_percent = result.int_32;
1518                 break;
1519         case Opt_errors:
1520                 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1521                         return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1522                 args->ar_errors = result.uint_32;
1523                 break;
1524         case Opt_barrier:
1525                 args->ar_nobarrier = result.boolean;
1526                 break;
1527         case Opt_rgrplvb:
1528                 args->ar_rgrplvb = result.boolean;
1529                 args->ar_got_rgrplvb = 1;
1530                 break;
1531         case Opt_loccookie:
1532                 args->ar_loccookie = result.boolean;
1533                 break;
1534         default:
1535                 return invalfc(fc, "invalid mount option: %s", param->key);
1536         }
1537         return 0;
1538 }
1539
1540 static int gfs2_reconfigure(struct fs_context *fc)
1541 {
1542         struct super_block *sb = fc->root->d_sb;
1543         struct gfs2_sbd *sdp = sb->s_fs_info;
1544         struct gfs2_args *oldargs = &sdp->sd_args;
1545         struct gfs2_args *newargs = fc->fs_private;
1546         struct gfs2_tune *gt = &sdp->sd_tune;
1547         int error = 0;
1548
1549         sync_filesystem(sb);
1550
1551         spin_lock(&gt->gt_spin);
1552         oldargs->ar_commit = gt->gt_logd_secs;
1553         oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1554         if (gt->gt_statfs_slow)
1555                 oldargs->ar_statfs_quantum = 0;
1556         else
1557                 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1558         spin_unlock(&gt->gt_spin);
1559
1560         if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1561                 errorfc(fc, "reconfiguration of locking protocol not allowed");
1562                 return -EINVAL;
1563         }
1564         if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1565                 errorfc(fc, "reconfiguration of lock table not allowed");
1566                 return -EINVAL;
1567         }
1568         if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1569                 errorfc(fc, "reconfiguration of host data not allowed");
1570                 return -EINVAL;
1571         }
1572         if (newargs->ar_spectator != oldargs->ar_spectator) {
1573                 errorfc(fc, "reconfiguration of spectator mode not allowed");
1574                 return -EINVAL;
1575         }
1576         if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1577                 errorfc(fc, "reconfiguration of localflocks not allowed");
1578                 return -EINVAL;
1579         }
1580         if (newargs->ar_meta != oldargs->ar_meta) {
1581                 errorfc(fc, "switching between gfs2 and gfs2meta not allowed");
1582                 return -EINVAL;
1583         }
1584         if (oldargs->ar_spectator)
1585                 fc->sb_flags |= SB_RDONLY;
1586
1587         if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1588                 struct gfs2_holder freeze_gh;
1589
1590                 error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
1591                 if (error)
1592                         return -EINVAL;
1593
1594                 if (fc->sb_flags & SB_RDONLY) {
1595                         gfs2_make_fs_ro(sdp);
1596                 } else {
1597                         error = gfs2_make_fs_rw(sdp);
1598                         if (error)
1599                                 errorfc(fc, "unable to remount read-write");
1600                 }
1601                 gfs2_freeze_unlock(&freeze_gh);
1602         }
1603         sdp->sd_args = *newargs;
1604
1605         if (sdp->sd_args.ar_posix_acl)
1606                 sb->s_flags |= SB_POSIXACL;
1607         else
1608                 sb->s_flags &= ~SB_POSIXACL;
1609         if (sdp->sd_args.ar_nobarrier)
1610                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1611         else
1612                 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1613         spin_lock(&gt->gt_spin);
1614         gt->gt_logd_secs = newargs->ar_commit;
1615         gt->gt_quota_quantum = newargs->ar_quota_quantum;
1616         if (newargs->ar_statfs_quantum) {
1617                 gt->gt_statfs_slow = 0;
1618                 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1619         }
1620         else {
1621                 gt->gt_statfs_slow = 1;
1622                 gt->gt_statfs_quantum = 30;
1623         }
1624         spin_unlock(&gt->gt_spin);
1625
1626         gfs2_online_uevent(sdp);
1627         return error;
1628 }
1629
1630 static const struct fs_context_operations gfs2_context_ops = {
1631         .free        = gfs2_fc_free,
1632         .parse_param = gfs2_parse_param,
1633         .get_tree    = gfs2_get_tree,
1634         .reconfigure = gfs2_reconfigure,
1635 };
1636
1637 /* Set up the filesystem mount context */
1638 static int gfs2_init_fs_context(struct fs_context *fc)
1639 {
1640         struct gfs2_args *args;
1641
1642         args = kmalloc(sizeof(*args), GFP_KERNEL);
1643         if (args == NULL)
1644                 return -ENOMEM;
1645
1646         if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1647                 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1648
1649                 *args = sdp->sd_args;
1650         } else {
1651                 memset(args, 0, sizeof(*args));
1652                 args->ar_quota = GFS2_QUOTA_DEFAULT;
1653                 args->ar_data = GFS2_DATA_DEFAULT;
1654                 args->ar_commit = 30;
1655                 args->ar_statfs_quantum = 30;
1656                 args->ar_quota_quantum = 60;
1657                 args->ar_errors = GFS2_ERRORS_DEFAULT;
1658         }
1659         fc->fs_private = args;
1660         fc->ops = &gfs2_context_ops;
1661         return 0;
1662 }
1663
1664 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1665 {
1666         return -EINVAL;
1667 }
1668
1669 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1670 {
1671         return (fc->sget_key == s->s_bdev);
1672 }
1673
1674 static int gfs2_meta_get_tree(struct fs_context *fc)
1675 {
1676         struct super_block *s;
1677         struct gfs2_sbd *sdp;
1678         struct path path;
1679         int error;
1680
1681         if (!fc->source || !*fc->source)
1682                 return -EINVAL;
1683
1684         error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1685         if (error) {
1686                 pr_warn("path_lookup on %s returned error %d\n",
1687                         fc->source, error);
1688                 return error;
1689         }
1690         fc->fs_type = &gfs2_fs_type;
1691         fc->sget_key = path.dentry->d_sb->s_bdev;
1692         s = sget_fc(fc, test_meta_super, set_meta_super);
1693         path_put(&path);
1694         if (IS_ERR(s)) {
1695                 pr_warn("gfs2 mount does not exist\n");
1696                 return PTR_ERR(s);
1697         }
1698         if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1699                 deactivate_locked_super(s);
1700                 return -EBUSY;
1701         }
1702         sdp = s->s_fs_info;
1703         fc->root = dget(sdp->sd_master_dir);
1704         return 0;
1705 }
1706
1707 static const struct fs_context_operations gfs2_meta_context_ops = {
1708         .free        = gfs2_fc_free,
1709         .get_tree    = gfs2_meta_get_tree,
1710 };
1711
1712 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1713 {
1714         int ret = gfs2_init_fs_context(fc);
1715
1716         if (ret)
1717                 return ret;
1718
1719         fc->ops = &gfs2_meta_context_ops;
1720         return 0;
1721 }
1722
1723 static void gfs2_kill_sb(struct super_block *sb)
1724 {
1725         struct gfs2_sbd *sdp = sb->s_fs_info;
1726
1727         if (sdp == NULL) {
1728                 kill_block_super(sb);
1729                 return;
1730         }
1731
1732         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1733         dput(sdp->sd_root_dir);
1734         dput(sdp->sd_master_dir);
1735         sdp->sd_root_dir = NULL;
1736         sdp->sd_master_dir = NULL;
1737         shrink_dcache_sb(sb);
1738         kill_block_super(sb);
1739 }
1740
1741 struct file_system_type gfs2_fs_type = {
1742         .name = "gfs2",
1743         .fs_flags = FS_REQUIRES_DEV,
1744         .init_fs_context = gfs2_init_fs_context,
1745         .parameters = gfs2_fs_parameters,
1746         .kill_sb = gfs2_kill_sb,
1747         .owner = THIS_MODULE,
1748 };
1749 MODULE_ALIAS_FS("gfs2");
1750
1751 struct file_system_type gfs2meta_fs_type = {
1752         .name = "gfs2meta",
1753         .fs_flags = FS_REQUIRES_DEV,
1754         .init_fs_context = gfs2_meta_init_fs_context,
1755         .owner = THIS_MODULE,
1756 };
1757 MODULE_ALIAS_FS("gfs2meta");