fs/gfs2/ops_fstype.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/sched.h>
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/blkdev.h>
  15 #include <linux/kthread.h>
  16 #include <linux/export.h>
  17 #include <linux/namei.h>
  18 #include <linux/mount.h>
  19 #include <linux/gfs2_ondisk.h>
  20 #include <linux/quotaops.h>
  21 #include <linux/lockdep.h>
  22 #include <linux/module.h>
  23 #include <linux/backing-dev.h>
  24 #include <linux/fs_parser.h>
  25
  26 #include "gfs2.h"
  27 #include "incore.h"
  28 #include "bmap.h"
  29 #include "glock.h"
  30 #include "glops.h"
  31 #include "inode.h"
  32 #include "recovery.h"
  33 #include "rgrp.h"
  34 #include "super.h"
  35 #include "sys.h"
  36 #include "util.h"
  37 #include "log.h"
  38 #include "quota.h"
  39 #include "dir.h"
  40 #include "meta_io.h"
  41 #include "trace_gfs2.h"
  42 #include "lops.h"
  43
  44 #define DO 0
  45 #define UNDO 1
  46
  47 /**
  48  * gfs2_tune_init - Fill a gfs2_tune structure with default values
  49  * @gt: tune
  50  *
  51  */
  52
  53 static void gfs2_tune_init(struct gfs2_tune *gt)
  54 {
  55         spin_lock_init(&gt->gt_spin);
  56
  57         gt->gt_quota_warn_period = 10;
  58         gt->gt_quota_scale_num = 1;
  59         gt->gt_quota_scale_den = 1;
  60         gt->gt_new_files_jdata = 0;
  61         gt->gt_max_readahead = BIT(18);
  62         gt->gt_complain_secs = 10;
  63 }
  64
  65 void free_sbd(struct gfs2_sbd *sdp)
  66 {
  67         if (sdp->sd_lkstats)
  68                 free_percpu(sdp->sd_lkstats);
  69         kfree(sdp);
  70 }
  71
  72 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  73 {
  74         struct gfs2_sbd *sdp;
  75         struct address_space *mapping;
  76
  77         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  78         if (!sdp)
  79                 return NULL;
  80
  81         sdp->sd_vfs = sb;
  82         sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
  83         if (!sdp->sd_lkstats)
  84                 goto fail;
  85         sb->s_fs_info = sdp;
  86
  87         set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
  88         gfs2_tune_init(&sdp->sd_tune);
  89
  90         init_waitqueue_head(&sdp->sd_glock_wait);
  91         init_waitqueue_head(&sdp->sd_async_glock_wait);
  92         atomic_set(&sdp->sd_glock_disposal, 0);
  93         init_completion(&sdp->sd_locking_init);
  94         init_completion(&sdp->sd_wdack);
  95         spin_lock_init(&sdp->sd_statfs_spin);
  96
  97         spin_lock_init(&sdp->sd_rindex_spin);
  98         sdp->sd_rindex_tree.rb_node = NULL;
  99
 100         INIT_LIST_HEAD(&sdp->sd_jindex_list);
 101         spin_lock_init(&sdp->sd_jindex_spin);
 102         mutex_init(&sdp->sd_jindex_mutex);
 103         init_completion(&sdp->sd_journal_ready);
 104
 105         INIT_LIST_HEAD(&sdp->sd_quota_list);
 106         mutex_init(&sdp->sd_quota_mutex);
 107         mutex_init(&sdp->sd_quota_sync_mutex);
 108         init_waitqueue_head(&sdp->sd_quota_wait);
 109         INIT_LIST_HEAD(&sdp->sd_trunc_list);
 110         spin_lock_init(&sdp->sd_trunc_lock);
 111         spin_lock_init(&sdp->sd_bitmap_lock);
 112
 113         INIT_LIST_HEAD(&sdp->sd_sc_inodes_list);
 114
 115         mapping = &sdp->sd_aspace;
 116
 117         address_space_init_once(mapping);
 118         mapping->a_ops = &gfs2_rgrp_aops;
 119         mapping->host = sb->s_bdev->bd_inode;
 120         mapping->flags = 0;
 121         mapping_set_gfp_mask(mapping, GFP_NOFS);
 122         mapping->private_data = NULL;
 123         mapping->writeback_index = 0;
 124
 125         spin_lock_init(&sdp->sd_log_lock);
 126         atomic_set(&sdp->sd_log_pinned, 0);
 127         INIT_LIST_HEAD(&sdp->sd_log_revokes);
 128         INIT_LIST_HEAD(&sdp->sd_log_ordered);
 129         spin_lock_init(&sdp->sd_ordered_lock);
 130
 131         init_waitqueue_head(&sdp->sd_log_waitq);
 132         init_waitqueue_head(&sdp->sd_logd_waitq);
 133         spin_lock_init(&sdp->sd_ail_lock);
 134         INIT_LIST_HEAD(&sdp->sd_ail1_list);
 135         INIT_LIST_HEAD(&sdp->sd_ail2_list);
 136
 137         init_rwsem(&sdp->sd_log_flush_lock);
 138         atomic_set(&sdp->sd_log_in_flight, 0);
 139         atomic_set(&sdp->sd_reserving_log, 0);
 140         init_waitqueue_head(&sdp->sd_reserving_log_wait);
 141         init_waitqueue_head(&sdp->sd_log_flush_wait);
 142         atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
 143         mutex_init(&sdp->sd_freeze_mutex);
 144
 145         return sdp;
 146
 147 fail:
 148         free_sbd(sdp);
 149         return NULL;
 150 }
 151
 152 /**
 153  * gfs2_check_sb - Check superblock
 154  * @sdp: the filesystem
 155  * @sb: The superblock
 156  * @silent: Don't print a message if the check fails
 157  *
 158  * Checks the version code of the FS is one that we understand how to
 159  * read and that the sizes of the various on-disk structures have not
 160  * changed.
 161  */
 162
 163 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
 164 {
 165         struct gfs2_sb_host *sb = &sdp->sd_sb;
 166
 167         if (sb->sb_magic != GFS2_MAGIC ||
 168             sb->sb_type != GFS2_METATYPE_SB) {
 169                 if (!silent)
 170                         pr_warn("not a GFS2 filesystem\n");
 171                 return -EINVAL;
 172         }
 173
 174         if (sb->sb_fs_format != GFS2_FORMAT_FS ||
 175             sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
 176                 fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
 177                 return -EINVAL;
 178         }
 179
 180         if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE ||
 181             (sb->sb_bsize & (sb->sb_bsize - 1))) {
 182                 pr_warn("Invalid superblock size\n");
 183                 return -EINVAL;
 184         }
 185
 186         return 0;
 187 }
 188
 189 static void end_bio_io_page(struct bio *bio)
 190 {
 191         struct page *page = bio->bi_private;
 192
 193         if (!bio->bi_status)
 194                 SetPageUptodate(page);
 195         else
 196                 pr_warn("error %d reading superblock\n", bio->bi_status);
 197         unlock_page(page);
 198 }
 199
 200 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
 201 {
 202         struct gfs2_sb_host *sb = &sdp->sd_sb;
 203         struct super_block *s = sdp->sd_vfs;
 204         const struct gfs2_sb *str = buf;
 205
 206         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
 207         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
 208         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
 209         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
 210         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
 211         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
 212         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
 213         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
 214         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
 215         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
 216         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
 217
 218         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
 219         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
 220         memcpy(&s->s_uuid, str->sb_uuid, 16);
 221 }
 222
 223 /**
 224  * gfs2_read_super - Read the gfs2 super block from disk
 225  * @sdp: The GFS2 super block
 226  * @sector: The location of the super block
 227  * @error: The error code to return
 228  *
 229  * This uses the bio functions to read the super block from disk
 230  * because we want to be 100% sure that we never read cached data.
 231  * A super block is read twice only during each GFS2 mount and is
 232  * never written to by the filesystem. The first time its read no
 233  * locks are held, and the only details which are looked at are those
 234  * relating to the locking protocol. Once locking is up and working,
 235  * the sb is read again under the lock to establish the location of
 236  * the master directory (contains pointers to journals etc) and the
 237  * root directory.
 238  *
 239  * Returns: 0 on success or error
 240  */
 241
 242 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
 243 {
 244         struct super_block *sb = sdp->sd_vfs;
 245         struct gfs2_sb *p;
 246         struct page *page;
 247         struct bio *bio;
 248
 249         page = alloc_page(GFP_NOFS);
 250         if (unlikely(!page))
 251                 return -ENOMEM;
 252
 253         ClearPageUptodate(page);
 254         ClearPageDirty(page);
 255         lock_page(page);
 256
 257         bio = bio_alloc(GFP_NOFS, 1);
 258         bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
 259         bio_set_dev(bio, sb->s_bdev);
 260         bio_add_page(bio, page, PAGE_SIZE, 0);
 261
 262         bio->bi_end_io = end_bio_io_page;
 263         bio->bi_private = page;
 264         bio_set_op_attrs(bio, REQ_OP_READ, REQ_META);
 265         submit_bio(bio);
 266         wait_on_page_locked(page);
 267         bio_put(bio);
 268         if (!PageUptodate(page)) {
 269                 __free_page(page);
 270                 return -EIO;
 271         }
 272         p = kmap(page);
 273         gfs2_sb_in(sdp, p);
 274         kunmap(page);
 275         __free_page(page);
 276         return gfs2_check_sb(sdp, silent);
 277 }
 278
 279 /**
 280  * gfs2_read_sb - Read super block
 281  * @sdp: The GFS2 superblock
 282  * @silent: Don't print message if mount fails
 283  *
 284  */
 285
 286 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
 287 {
 288         u32 hash_blocks, ind_blocks, leaf_blocks;
 289         u32 tmp_blocks;
 290         unsigned int x;
 291         int error;
 292
 293         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 294         if (error) {
 295                 if (!silent)
 296                         fs_err(sdp, "can't read superblock\n");
 297                 return error;
 298         }
 299
 300         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 301                                GFS2_BASIC_BLOCK_SHIFT;
 302         sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
 303         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 304                           sizeof(struct gfs2_dinode)) / sizeof(u64);
 305         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 306                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
 307         sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize -
 308                           sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
 309         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 310         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 311         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 312         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 313         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 314                                 sizeof(struct gfs2_meta_header)) /
 315                                 sizeof(struct gfs2_quota_change);
 316         sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
 317                                      sizeof(struct gfs2_meta_header))
 318                 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
 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         /* Set up the buffer cache and SB for real */
 492         if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
 493                 ret = -EINVAL;
 494                 fs_err(sdp, "FS block size (%u) is too small for device "
 495                        "block size (%u)\n",
 496                        sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
 497                 goto out;
 498         }
 499         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 500                 ret = -EINVAL;
 501                 fs_err(sdp, "FS block size (%u) is too big for machine "
 502                        "page size (%u)\n",
 503                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 504                 goto out;
 505         }
 506         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 507
 508         /* Get the root inode */
 509         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 510         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 511         if (ret)
 512                 goto out;
 513
 514         /* Get the master inode */
 515         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 516         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 517         if (ret) {
 518                 dput(sdp->sd_root_dir);
 519                 goto out;
 520         }
 521         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 522 out:
 523         gfs2_glock_dq_uninit(&sb_gh);
 524         return ret;
 525 }
 526
 527 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
 528 {
 529         char *message = "FIRSTMOUNT=Done";
 530         char *envp[] = { message, NULL };
 531
 532         fs_info(sdp, "first mount done, others may mount\n");
 533
 534         if (sdp->sd_lockstruct.ls_ops->lm_first_done)
 535                 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
 536
 537         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
 538 }
 539
 540 /**
 541  * gfs2_jindex_hold - Grab a lock on the jindex
 542  * @sdp: The GFS2 superblock
 543  * @ji_gh: the holder for the jindex glock
 544  *
 545  * Returns: errno
 546  */
 547
 548 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 549 {
 550         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
 551         struct qstr name;
 552         char buf[20];
 553         struct gfs2_jdesc *jd;
 554         int error;
 555
 556         name.name = buf;
 557
 558         mutex_lock(&sdp->sd_jindex_mutex);
 559
 560         for (;;) {
 561                 struct gfs2_inode *jip;
 562
 563                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
 564                 if (error)
 565                         break;
 566
 567                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
 568                 name.hash = gfs2_disk_hash(name.name, name.len);
 569
 570                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
 571                 if (error == -ENOENT) {
 572                         error = 0;
 573                         break;
 574                 }
 575
 576                 gfs2_glock_dq_uninit(ji_gh);
 577
 578                 if (error)
 579                         break;
 580
 581                 error = -ENOMEM;
 582                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
 583                 if (!jd)
 584                         break;
 585
 586                 INIT_LIST_HEAD(&jd->extent_list);
 587                 INIT_LIST_HEAD(&jd->jd_revoke_list);
 588
 589                 INIT_WORK(&jd->jd_work, gfs2_recover_func);
 590                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
 591                 if (IS_ERR_OR_NULL(jd->jd_inode)) {
 592                         if (!jd->jd_inode)
 593                                 error = -ENOENT;
 594                         else
 595                                 error = PTR_ERR(jd->jd_inode);
 596                         kfree(jd);
 597                         break;
 598                 }
 599
 600                 spin_lock(&sdp->sd_jindex_spin);
 601                 jd->jd_jid = sdp->sd_journals++;
 602                 jip = GFS2_I(jd->jd_inode);
 603                 jd->jd_no_addr = jip->i_no_addr;
 604                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
 605                 spin_unlock(&sdp->sd_jindex_spin);
 606         }
 607
 608         mutex_unlock(&sdp->sd_jindex_mutex);
 609
 610         return error;
 611 }
 612
 613 /**
 614  * init_statfs - look up and initialize master and local (per node) statfs inodes
 615  * @sdp: The GFS2 superblock
 616  *
 617  * This should be called after the jindex is initialized in init_journal() and
 618  * before gfs2_journal_recovery() is called because we need to be able to write
 619  * to these inodes during recovery.
 620  *
 621  * Returns: errno
 622  */
 623 static int init_statfs(struct gfs2_sbd *sdp)
 624 {
 625         int error = 0;
 626         struct inode *master = d_inode(sdp->sd_master_dir);
 627         struct inode *pn = NULL;
 628         char buf[30];
 629         struct gfs2_jdesc *jd;
 630         struct gfs2_inode *ip;
 631
 632         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 633         if (IS_ERR(sdp->sd_statfs_inode)) {
 634                 error = PTR_ERR(sdp->sd_statfs_inode);
 635                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 636                 goto out;
 637         }
 638         if (sdp->sd_args.ar_spectator)
 639                 goto out;
 640
 641         pn = gfs2_lookup_simple(master, "per_node");
 642         if (IS_ERR(pn)) {
 643                 error = PTR_ERR(pn);
 644                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 645                 goto put_statfs;
 646         }
 647
 648         /* For each jid, lookup the corresponding local statfs inode in the
 649          * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */
 650         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 651                 struct local_statfs_inode *lsi =
 652                         kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS);
 653                 if (!lsi) {
 654                         error = -ENOMEM;
 655                         goto free_local;
 656                 }
 657                 sprintf(buf, "statfs_change%u", jd->jd_jid);
 658                 lsi->si_sc_inode = gfs2_lookup_simple(pn, buf);
 659                 if (IS_ERR(lsi->si_sc_inode)) {
 660                         error = PTR_ERR(lsi->si_sc_inode);
 661                         fs_err(sdp, "can't find local \"sc\" file#%u: %d\n",
 662                                jd->jd_jid, error);
 663                         goto free_local;
 664                 }
 665                 lsi->si_jid = jd->jd_jid;
 666                 if (jd->jd_jid == sdp->sd_jdesc->jd_jid)
 667                         sdp->sd_sc_inode = lsi->si_sc_inode;
 668
 669                 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list);
 670         }
 671
 672         iput(pn);
 673         ip = GFS2_I(sdp->sd_sc_inode);
 674         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 675                                    &sdp->sd_sc_gh);
 676         if (error) {
 677                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 678                 goto free_local;
 679         }
 680         return 0;
 681
 682 free_local:
 683         free_local_statfs_inodes(sdp);
 684         iput(pn);
 685 put_statfs:
 686         iput(sdp->sd_statfs_inode);
 687 out:
 688         return error;
 689 }
 690
 691 /* Uninitialize and free up memory used by the list of statfs inodes */
 692 static void uninit_statfs(struct gfs2_sbd *sdp)
 693 {
 694         if (!sdp->sd_args.ar_spectator) {
 695                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 696                 free_local_statfs_inodes(sdp);
 697         }
 698         iput(sdp->sd_statfs_inode);
 699 }
 700
 701 static int init_journal(struct gfs2_sbd *sdp, int undo)
 702 {
 703         struct inode *master = d_inode(sdp->sd_master_dir);
 704         struct gfs2_holder ji_gh;
 705         struct gfs2_inode *ip;
 706         int jindex = 1;
 707         int error = 0;
 708
 709         if (undo) {
 710                 jindex = 0;
 711                 goto fail_statfs;
 712         }
 713
 714         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
 715         if (IS_ERR(sdp->sd_jindex)) {
 716                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 717                 return PTR_ERR(sdp->sd_jindex);
 718         }
 719
 720         /* Load in the journal index special file */
 721
 722         error = gfs2_jindex_hold(sdp, &ji_gh);
 723         if (error) {
 724                 fs_err(sdp, "can't read journal index: %d\n", error);
 725                 goto fail;
 726         }
 727
 728         error = -EUSERS;
 729         if (!gfs2_jindex_size(sdp)) {
 730                 fs_err(sdp, "no journals!\n");
 731                 goto fail_jindex;
 732         }
 733
 734         atomic_set(&sdp->sd_log_blks_needed, 0);
 735         if (sdp->sd_args.ar_spectator) {
 736                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 737                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 738                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 739                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 740         } else {
 741                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 742                         fs_err(sdp, "can't mount journal #%u\n",
 743                                sdp->sd_lockstruct.ls_jid);
 744                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 745                                gfs2_jindex_size(sdp),
 746                                gfs2_jindex_size(sdp) - 1);
 747                         goto fail_jindex;
 748                 }
 749                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 750
 751                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 752                                           &gfs2_journal_glops,
 753                                           LM_ST_EXCLUSIVE,
 754                                           LM_FLAG_NOEXP | GL_NOCACHE,
 755                                           &sdp->sd_journal_gh);
 756                 if (error) {
 757                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 758                         goto fail_jindex;
 759                 }
 760
 761                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 762                 sdp->sd_jinode_gl = ip->i_gl;
 763                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 764                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 765                                            &sdp->sd_jinode_gh);
 766                 if (error) {
 767                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 768                                error);
 769                         goto fail_journal_gh;
 770                 }
 771
 772                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 773                 if (error) {
 774                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 775                                sdp->sd_jdesc->jd_jid, error);
 776                         goto fail_jinode_gh;
 777                 }
 778                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 779                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 780                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 781
 782                 /* Map the extents for this journal's blocks */
 783                 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
 784         }
 785         trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
 786
 787         /* Lookup statfs inodes here so journal recovery can use them. */
 788         error = init_statfs(sdp);
 789         if (error)
 790                 goto fail_jinode_gh;
 791
 792         if (sdp->sd_lockstruct.ls_first) {
 793                 unsigned int x;
 794                 for (x = 0; x < sdp->sd_journals; x++) {
 795                         struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
 796
 797                         if (sdp->sd_args.ar_spectator) {
 798                                 error = check_journal_clean(sdp, jd, true);
 799                                 if (error)
 800                                         goto fail_statfs;
 801                                 continue;
 802                         }
 803                         error = gfs2_recover_journal(jd, true);
 804                         if (error) {
 805                                 fs_err(sdp, "error recovering journal %u: %d\n",
 806                                        x, error);
 807                                 goto fail_statfs;
 808                         }
 809                 }
 810
 811                 gfs2_others_may_mount(sdp);
 812         } else if (!sdp->sd_args.ar_spectator) {
 813                 error = gfs2_recover_journal(sdp->sd_jdesc, true);
 814                 if (error) {
 815                         fs_err(sdp, "error recovering my journal: %d\n", error);
 816                         goto fail_statfs;
 817                 }
 818         }
 819
 820         sdp->sd_log_idle = 1;
 821         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 822         gfs2_glock_dq_uninit(&ji_gh);
 823         jindex = 0;
 824         INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
 825         return 0;
 826
 827 fail_statfs:
 828         uninit_statfs(sdp);
 829 fail_jinode_gh:
 830         /* A withdraw may have done dq/uninit so now we need to check it */
 831         if (!sdp->sd_args.ar_spectator &&
 832             gfs2_holder_initialized(&sdp->sd_jinode_gh))
 833                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 834 fail_journal_gh:
 835         if (!sdp->sd_args.ar_spectator &&
 836             gfs2_holder_initialized(&sdp->sd_journal_gh))
 837                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 838 fail_jindex:
 839         gfs2_jindex_free(sdp);
 840         if (jindex)
 841                 gfs2_glock_dq_uninit(&ji_gh);
 842 fail:
 843         iput(sdp->sd_jindex);
 844         return error;
 845 }
 846
 847 static struct lock_class_key gfs2_quota_imutex_key;
 848
 849 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 850 {
 851         int error = 0;
 852         struct inode *master = d_inode(sdp->sd_master_dir);
 853
 854         if (undo)
 855                 goto fail_qinode;
 856
 857         error = init_journal(sdp, undo);
 858         complete_all(&sdp->sd_journal_ready);
 859         if (error)
 860                 goto fail;
 861
 862         /* Read in the resource index inode */
 863         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 864         if (IS_ERR(sdp->sd_rindex)) {
 865                 error = PTR_ERR(sdp->sd_rindex);
 866                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 867                 goto fail_journal;
 868         }
 869         sdp->sd_rindex_uptodate = 0;
 870
 871         /* Read in the quota inode */
 872         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 873         if (IS_ERR(sdp->sd_quota_inode)) {
 874                 error = PTR_ERR(sdp->sd_quota_inode);
 875                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 876                 goto fail_rindex;
 877         }
 878         /*
 879          * i_rwsem on quota files is special. Since this inode is hidden system
 880          * file, we are safe to define locking ourselves.
 881          */
 882         lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
 883                           &gfs2_quota_imutex_key);
 884
 885         error = gfs2_rindex_update(sdp);
 886         if (error)
 887                 goto fail_qinode;
 888
 889         return 0;
 890
 891 fail_qinode:
 892         iput(sdp->sd_quota_inode);
 893 fail_rindex:
 894         gfs2_clear_rgrpd(sdp);
 895         iput(sdp->sd_rindex);
 896 fail_journal:
 897         init_journal(sdp, UNDO);
 898 fail:
 899         return error;
 900 }
 901
 902 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 903 {
 904         struct inode *pn = NULL;
 905         char buf[30];
 906         int error = 0;
 907         struct gfs2_inode *ip;
 908         struct inode *master = d_inode(sdp->sd_master_dir);
 909
 910         if (sdp->sd_args.ar_spectator)
 911                 return 0;
 912
 913         if (undo)
 914                 goto fail_qc_gh;
 915
 916         pn = gfs2_lookup_simple(master, "per_node");
 917         if (IS_ERR(pn)) {
 918                 error = PTR_ERR(pn);
 919                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 920                 return error;
 921         }
 922
 923         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 924         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 925         if (IS_ERR(sdp->sd_qc_inode)) {
 926                 error = PTR_ERR(sdp->sd_qc_inode);
 927                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 928                 goto fail_ut_i;
 929         }
 930
 931         iput(pn);
 932         pn = NULL;
 933
 934         ip = GFS2_I(sdp->sd_qc_inode);
 935         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 936                                    &sdp->sd_qc_gh);
 937         if (error) {
 938                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 939                 goto fail_qc_i;
 940         }
 941
 942         return 0;
 943
 944 fail_qc_gh:
 945         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 946 fail_qc_i:
 947         iput(sdp->sd_qc_inode);
 948 fail_ut_i:
 949         iput(pn);
 950         return error;
 951 }
 952
 953 static const match_table_t nolock_tokens = {
 954         { Opt_jid, "jid=%d", },
 955         { Opt_err, NULL },
 956 };
 957
 958 static const struct lm_lockops nolock_ops = {
 959         .lm_proto_name = "lock_nolock",
 960         .lm_put_lock = gfs2_glock_free,
 961         .lm_tokens = &nolock_tokens,
 962 };
 963
 964 /**
 965  * gfs2_lm_mount - mount a locking protocol
 966  * @sdp: the filesystem
 967  * @args: mount arguments
 968  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
 969  *
 970  * Returns: errno
 971  */
 972
 973 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
 974 {
 975         const struct lm_lockops *lm;
 976         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 977         struct gfs2_args *args = &sdp->sd_args;
 978         const char *proto = sdp->sd_proto_name;
 979         const char *table = sdp->sd_table_name;
 980         char *o, *options;
 981         int ret;
 982
 983         if (!strcmp("lock_nolock", proto)) {
 984                 lm = &nolock_ops;
 985                 sdp->sd_args.ar_localflocks = 1;
 986 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
 987         } else if (!strcmp("lock_dlm", proto)) {
 988                 lm = &gfs2_dlm_ops;
 989 #endif
 990         } else {
 991                 pr_info("can't find protocol %s\n", proto);
 992                 return -ENOENT;
 993         }
 994
 995         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
 996
 997         ls->ls_ops = lm;
 998         ls->ls_first = 1;
 999
1000         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1001                 substring_t tmp[MAX_OPT_ARGS];
1002                 int token, option;
1003
1004                 if (!o || !*o)
1005                         continue;
1006
1007                 token = match_token(o, *lm->lm_tokens, tmp);
1008                 switch (token) {
1009                 case Opt_jid:
1010                         ret = match_int(&tmp[0], &option);
1011                         if (ret || option < 0)
1012                                 goto hostdata_error;
1013                         if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1014                                 ls->ls_jid = option;
1015                         break;
1016                 case Opt_id:
1017                 case Opt_nodir:
1018                         /* Obsolete, but left for backward compat purposes */
1019                         break;
1020                 case Opt_first:
1021                         ret = match_int(&tmp[0], &option);
1022                         if (ret || (option != 0 && option != 1))
1023                                 goto hostdata_error;
1024                         ls->ls_first = option;
1025                         break;
1026                 case Opt_err:
1027                 default:
1028 hostdata_error:
1029                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1030                         return -EINVAL;
1031                 }
1032         }
1033
1034         if (lm->lm_mount == NULL) {
1035                 fs_info(sdp, "Now mounting FS...\n");
1036                 complete_all(&sdp->sd_locking_init);
1037                 return 0;
1038         }
1039         ret = lm->lm_mount(sdp, table);
1040         if (ret == 0)
1041                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1042         complete_all(&sdp->sd_locking_init);
1043         return ret;
1044 }
1045
1046 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1047 {
1048         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1049         if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount)
1050                 lm->lm_unmount(sdp);
1051 }
1052
1053 static int wait_on_journal(struct gfs2_sbd *sdp)
1054 {
1055         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1056                 return 0;
1057
1058         return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1059                 ? -EINTR : 0;
1060 }
1061
1062 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1063 {
1064         struct super_block *sb = sdp->sd_vfs;
1065         char ro[20];
1066         char spectator[20];
1067         char *envp[] = { ro, spectator, NULL };
1068         sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1069         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1070         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1071 }
1072
1073 /**
1074  * gfs2_fill_super - Read in superblock
1075  * @sb: The VFS superblock
1076  * @args: Mount options
1077  * @silent: Don't complain if it's not a GFS2 filesystem
1078  *
1079  * Returns: -errno
1080  */
1081 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1082 {
1083         struct gfs2_args *args = fc->fs_private;
1084         int silent = fc->sb_flags & SB_SILENT;
1085         struct gfs2_sbd *sdp;
1086         struct gfs2_holder mount_gh;
1087         int error;
1088
1089         sdp = init_sbd(sb);
1090         if (!sdp) {
1091                 pr_warn("can't alloc struct gfs2_sbd\n");
1092                 return -ENOMEM;
1093         }
1094         sdp->sd_args = *args;
1095
1096         if (sdp->sd_args.ar_spectator) {
1097                 sb->s_flags |= SB_RDONLY;
1098                 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1099         }
1100         if (sdp->sd_args.ar_posix_acl)
1101                 sb->s_flags |= SB_POSIXACL;
1102         if (sdp->sd_args.ar_nobarrier)
1103                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1104
1105         sb->s_flags |= SB_NOSEC;
1106         sb->s_magic = GFS2_MAGIC;
1107         sb->s_op = &gfs2_super_ops;
1108         sb->s_d_op = &gfs2_dops;
1109         sb->s_export_op = &gfs2_export_ops;
1110         sb->s_xattr = gfs2_xattr_handlers;
1111         sb->s_qcop = &gfs2_quotactl_ops;
1112         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1113         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1114         sb->s_time_gran = 1;
1115         sb->s_maxbytes = MAX_LFS_FILESIZE;
1116
1117         /* Set up the buffer cache and fill in some fake block size values
1118            to allow us to read-in the on-disk superblock. */
1119         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1120         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1121         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1122                                GFS2_BASIC_BLOCK_SHIFT;
1123         sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1124
1125         sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1126         sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1127         if (sdp->sd_args.ar_statfs_quantum) {
1128                 sdp->sd_tune.gt_statfs_slow = 0;
1129                 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1130         } else {
1131                 sdp->sd_tune.gt_statfs_slow = 1;
1132                 sdp->sd_tune.gt_statfs_quantum = 30;
1133         }
1134
1135         error = init_names(sdp, silent);
1136         if (error)
1137                 goto fail_free;
1138
1139         snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1140
1141         error = gfs2_sys_fs_add(sdp);
1142         if (error)
1143                 goto fail_free;
1144
1145         gfs2_create_debugfs_file(sdp);
1146
1147         error = gfs2_lm_mount(sdp, silent);
1148         if (error)
1149                 goto fail_debug;
1150
1151         error = init_locking(sdp, &mount_gh, DO);
1152         if (error)
1153                 goto fail_lm;
1154
1155         error = init_sb(sdp, silent);
1156         if (error)
1157                 goto fail_locking;
1158
1159         error = wait_on_journal(sdp);
1160         if (error)
1161                 goto fail_sb;
1162
1163         /*
1164          * If user space has failed to join the cluster or some similar
1165          * failure has occurred, then the journal id will contain a
1166          * negative (error) number. This will then be returned to the
1167          * caller (of the mount syscall). We do this even for spectator
1168          * mounts (which just write a jid of 0 to indicate "ok" even though
1169          * the jid is unused in the spectator case)
1170          */
1171         if (sdp->sd_lockstruct.ls_jid < 0) {
1172                 error = sdp->sd_lockstruct.ls_jid;
1173                 sdp->sd_lockstruct.ls_jid = 0;
1174                 goto fail_sb;
1175         }
1176
1177         if (sdp->sd_args.ar_spectator)
1178                 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1179                          sdp->sd_table_name);
1180         else
1181                 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1182                          sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1183
1184         error = init_inodes(sdp, DO);
1185         if (error)
1186                 goto fail_sb;
1187
1188         error = init_per_node(sdp, DO);
1189         if (error)
1190                 goto fail_inodes;
1191
1192         error = gfs2_statfs_init(sdp);
1193         if (error) {
1194                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1195                 goto fail_per_node;
1196         }
1197
1198         if (sb_rdonly(sb)) {
1199                 struct gfs2_holder freeze_gh;
1200
1201                 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED,
1202                                            LM_FLAG_NOEXP | GL_EXACT,
1203                                            &freeze_gh);
1204                 if (error) {
1205                         fs_err(sdp, "can't make FS RO: %d\n", error);
1206                         goto fail_per_node;
1207                 }
1208                 gfs2_glock_dq_uninit(&freeze_gh);
1209         } else {
1210                 error = gfs2_make_fs_rw(sdp);
1211                 if (error) {
1212                         fs_err(sdp, "can't make FS RW: %d\n", error);
1213                         goto fail_per_node;
1214                 }
1215         }
1216
1217         gfs2_glock_dq_uninit(&mount_gh);
1218         gfs2_online_uevent(sdp);
1219         return 0;
1220
1221 fail_per_node:
1222         init_per_node(sdp, UNDO);
1223 fail_inodes:
1224         init_inodes(sdp, UNDO);
1225 fail_sb:
1226         if (sdp->sd_root_dir)
1227                 dput(sdp->sd_root_dir);
1228         if (sdp->sd_master_dir)
1229                 dput(sdp->sd_master_dir);
1230         if (sb->s_root)
1231                 dput(sb->s_root);
1232         sb->s_root = NULL;
1233 fail_locking:
1234         init_locking(sdp, &mount_gh, UNDO);
1235 fail_lm:
1236         complete_all(&sdp->sd_journal_ready);
1237         gfs2_gl_hash_clear(sdp);
1238         gfs2_lm_unmount(sdp);
1239 fail_debug:
1240         gfs2_delete_debugfs_file(sdp);
1241         gfs2_sys_fs_del(sdp);
1242 fail_free:
1243         free_sbd(sdp);
1244         sb->s_fs_info = NULL;
1245         return error;
1246 }
1247
1248 /**
1249  * gfs2_get_tree - Get the GFS2 superblock and root directory
1250  * @fc: The filesystem context
1251  *
1252  * Returns: 0 or -errno on error
1253  */
1254 static int gfs2_get_tree(struct fs_context *fc)
1255 {
1256         struct gfs2_args *args = fc->fs_private;
1257         struct gfs2_sbd *sdp;
1258         int error;
1259
1260         error = get_tree_bdev(fc, gfs2_fill_super);
1261         if (error)
1262                 return error;
1263
1264         sdp = fc->root->d_sb->s_fs_info;
1265         dput(fc->root);
1266         if (args->ar_meta)
1267                 fc->root = dget(sdp->sd_master_dir);
1268         else
1269                 fc->root = dget(sdp->sd_root_dir);
1270         return 0;
1271 }
1272
1273 static void gfs2_fc_free(struct fs_context *fc)
1274 {
1275         struct gfs2_args *args = fc->fs_private;
1276
1277         kfree(args);
1278 }
1279
1280 enum gfs2_param {
1281         Opt_lockproto,
1282         Opt_locktable,
1283         Opt_hostdata,
1284         Opt_spectator,
1285         Opt_ignore_local_fs,
1286         Opt_localflocks,
1287         Opt_localcaching,
1288         Opt_debug,
1289         Opt_upgrade,
1290         Opt_acl,
1291         Opt_quota,
1292         Opt_quota_flag,
1293         Opt_suiddir,
1294         Opt_data,
1295         Opt_meta,
1296         Opt_discard,
1297         Opt_commit,
1298         Opt_errors,
1299         Opt_statfs_quantum,
1300         Opt_statfs_percent,
1301         Opt_quota_quantum,
1302         Opt_barrier,
1303         Opt_rgrplvb,
1304         Opt_loccookie,
1305 };
1306
1307 static const struct constant_table gfs2_param_quota[] = {
1308         {"off",        GFS2_QUOTA_OFF},
1309         {"account",    GFS2_QUOTA_ACCOUNT},
1310         {"on",         GFS2_QUOTA_ON},
1311         {}
1312 };
1313
1314 enum opt_data {
1315         Opt_data_writeback = GFS2_DATA_WRITEBACK,
1316         Opt_data_ordered   = GFS2_DATA_ORDERED,
1317 };
1318
1319 static const struct constant_table gfs2_param_data[] = {
1320         {"writeback",  Opt_data_writeback },
1321         {"ordered",    Opt_data_ordered },
1322         {}
1323 };
1324
1325 enum opt_errors {
1326         Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1327         Opt_errors_panic    = GFS2_ERRORS_PANIC,
1328 };
1329
1330 static const struct constant_table gfs2_param_errors[] = {
1331         {"withdraw",   Opt_errors_withdraw },
1332         {"panic",      Opt_errors_panic },
1333         {}
1334 };
1335
1336 static const struct fs_parameter_spec gfs2_fs_parameters[] = {
1337         fsparam_string ("lockproto",          Opt_lockproto),
1338         fsparam_string ("locktable",          Opt_locktable),
1339         fsparam_string ("hostdata",           Opt_hostdata),
1340         fsparam_flag   ("spectator",          Opt_spectator),
1341         fsparam_flag   ("norecovery",         Opt_spectator),
1342         fsparam_flag   ("ignore_local_fs",    Opt_ignore_local_fs),
1343         fsparam_flag   ("localflocks",        Opt_localflocks),
1344         fsparam_flag   ("localcaching",       Opt_localcaching),
1345         fsparam_flag_no("debug",              Opt_debug),
1346         fsparam_flag   ("upgrade",            Opt_upgrade),
1347         fsparam_flag_no("acl",                Opt_acl),
1348         fsparam_flag_no("suiddir",            Opt_suiddir),
1349         fsparam_enum   ("data",               Opt_data, gfs2_param_data),
1350         fsparam_flag   ("meta",               Opt_meta),
1351         fsparam_flag_no("discard",            Opt_discard),
1352         fsparam_s32    ("commit",             Opt_commit),
1353         fsparam_enum   ("errors",             Opt_errors, gfs2_param_errors),
1354         fsparam_s32    ("statfs_quantum",     Opt_statfs_quantum),
1355         fsparam_s32    ("statfs_percent",     Opt_statfs_percent),
1356         fsparam_s32    ("quota_quantum",      Opt_quota_quantum),
1357         fsparam_flag_no("barrier",            Opt_barrier),
1358         fsparam_flag_no("rgrplvb",            Opt_rgrplvb),
1359         fsparam_flag_no("loccookie",          Opt_loccookie),
1360         /* quota can be a flag or an enum so it gets special treatment */
1361         fsparam_flag_no("quota",              Opt_quota_flag),
1362         fsparam_enum("quota",                 Opt_quota, gfs2_param_quota),
1363         {}
1364 };
1365
1366 /* Parse a single mount parameter */
1367 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1368 {
1369         struct gfs2_args *args = fc->fs_private;
1370         struct fs_parse_result result;
1371         int o;
1372
1373         o = fs_parse(fc, gfs2_fs_parameters, param, &result);
1374         if (o < 0)
1375                 return o;
1376
1377         switch (o) {
1378         case Opt_lockproto:
1379                 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1380                 break;
1381         case Opt_locktable:
1382                 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1383                 break;
1384         case Opt_hostdata:
1385                 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1386                 break;
1387         case Opt_spectator:
1388                 args->ar_spectator = 1;
1389                 break;
1390         case Opt_ignore_local_fs:
1391                 /* Retained for backwards compat only */
1392                 break;
1393         case Opt_localflocks:
1394                 args->ar_localflocks = 1;
1395                 break;
1396         case Opt_localcaching:
1397                 /* Retained for backwards compat only */
1398                 break;
1399         case Opt_debug:
1400                 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1401                         return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1402                 args->ar_debug = result.boolean;
1403                 break;
1404         case Opt_upgrade:
1405                 /* Retained for backwards compat only */
1406                 break;
1407         case Opt_acl:
1408                 args->ar_posix_acl = result.boolean;
1409                 break;
1410         case Opt_quota_flag:
1411                 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON;
1412                 break;
1413         case Opt_quota:
1414                 args->ar_quota = result.int_32;
1415                 break;
1416         case Opt_suiddir:
1417                 args->ar_suiddir = result.boolean;
1418                 break;
1419         case Opt_data:
1420                 /* The uint_32 result maps directly to GFS2_DATA_* */
1421                 args->ar_data = result.uint_32;
1422                 break;
1423         case Opt_meta:
1424                 args->ar_meta = 1;
1425                 break;
1426         case Opt_discard:
1427                 args->ar_discard = result.boolean;
1428                 break;
1429         case Opt_commit:
1430                 if (result.int_32 <= 0)
1431                         return invalfc(fc, "commit mount option requires a positive numeric argument");
1432                 args->ar_commit = result.int_32;
1433                 break;
1434         case Opt_statfs_quantum:
1435                 if (result.int_32 < 0)
1436                         return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument");
1437                 args->ar_statfs_quantum = result.int_32;
1438                 break;
1439         case Opt_quota_quantum:
1440                 if (result.int_32 <= 0)
1441                         return invalfc(fc, "quota_quantum mount option requires a positive numeric argument");
1442                 args->ar_quota_quantum = result.int_32;
1443                 break;
1444         case Opt_statfs_percent:
1445                 if (result.int_32 < 0 || result.int_32 > 100)
1446                         return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100");
1447                 args->ar_statfs_percent = result.int_32;
1448                 break;
1449         case Opt_errors:
1450                 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1451                         return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1452                 args->ar_errors = result.uint_32;
1453                 break;
1454         case Opt_barrier:
1455                 args->ar_nobarrier = result.boolean;
1456                 break;
1457         case Opt_rgrplvb:
1458                 args->ar_rgrplvb = result.boolean;
1459                 break;
1460         case Opt_loccookie:
1461                 args->ar_loccookie = result.boolean;
1462                 break;
1463         default:
1464                 return invalfc(fc, "invalid mount option: %s", param->key);
1465         }
1466         return 0;
1467 }
1468
1469 static int gfs2_reconfigure(struct fs_context *fc)
1470 {
1471         struct super_block *sb = fc->root->d_sb;
1472         struct gfs2_sbd *sdp = sb->s_fs_info;
1473         struct gfs2_args *oldargs = &sdp->sd_args;
1474         struct gfs2_args *newargs = fc->fs_private;
1475         struct gfs2_tune *gt = &sdp->sd_tune;
1476         int error = 0;
1477
1478         sync_filesystem(sb);
1479
1480         spin_lock(&gt->gt_spin);
1481         oldargs->ar_commit = gt->gt_logd_secs;
1482         oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1483         if (gt->gt_statfs_slow)
1484                 oldargs->ar_statfs_quantum = 0;
1485         else
1486                 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1487         spin_unlock(&gt->gt_spin);
1488
1489         if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1490                 errorfc(fc, "reconfiguration of locking protocol not allowed");
1491                 return -EINVAL;
1492         }
1493         if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1494                 errorfc(fc, "reconfiguration of lock table not allowed");
1495                 return -EINVAL;
1496         }
1497         if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1498                 errorfc(fc, "reconfiguration of host data not allowed");
1499                 return -EINVAL;
1500         }
1501         if (newargs->ar_spectator != oldargs->ar_spectator) {
1502                 errorfc(fc, "reconfiguration of spectator mode not allowed");
1503                 return -EINVAL;
1504         }
1505         if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1506                 errorfc(fc, "reconfiguration of localflocks not allowed");
1507                 return -EINVAL;
1508         }
1509         if (newargs->ar_meta != oldargs->ar_meta) {
1510                 errorfc(fc, "switching between gfs2 and gfs2meta not allowed");
1511                 return -EINVAL;
1512         }
1513         if (oldargs->ar_spectator)
1514                 fc->sb_flags |= SB_RDONLY;
1515
1516         if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1517                 if (fc->sb_flags & SB_RDONLY) {
1518                         error = gfs2_make_fs_ro(sdp);
1519                         if (error)
1520                                 errorfc(fc, "unable to remount read-only");
1521                 } else {
1522                         error = gfs2_make_fs_rw(sdp);
1523                         if (error)
1524                                 errorfc(fc, "unable to remount read-write");
1525                 }
1526         }
1527         sdp->sd_args = *newargs;
1528
1529         if (sdp->sd_args.ar_posix_acl)
1530                 sb->s_flags |= SB_POSIXACL;
1531         else
1532                 sb->s_flags &= ~SB_POSIXACL;
1533         if (sdp->sd_args.ar_nobarrier)
1534                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1535         else
1536                 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1537         spin_lock(&gt->gt_spin);
1538         gt->gt_logd_secs = newargs->ar_commit;
1539         gt->gt_quota_quantum = newargs->ar_quota_quantum;
1540         if (newargs->ar_statfs_quantum) {
1541                 gt->gt_statfs_slow = 0;
1542                 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1543         }
1544         else {
1545                 gt->gt_statfs_slow = 1;
1546                 gt->gt_statfs_quantum = 30;
1547         }
1548         spin_unlock(&gt->gt_spin);
1549
1550         gfs2_online_uevent(sdp);
1551         return error;
1552 }
1553
1554 static const struct fs_context_operations gfs2_context_ops = {
1555         .free        = gfs2_fc_free,
1556         .parse_param = gfs2_parse_param,
1557         .get_tree    = gfs2_get_tree,
1558         .reconfigure = gfs2_reconfigure,
1559 };
1560
1561 /* Set up the filesystem mount context */
1562 static int gfs2_init_fs_context(struct fs_context *fc)
1563 {
1564         struct gfs2_args *args;
1565
1566         args = kmalloc(sizeof(*args), GFP_KERNEL);
1567         if (args == NULL)
1568                 return -ENOMEM;
1569
1570         if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1571                 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1572
1573                 *args = sdp->sd_args;
1574         } else {
1575                 memset(args, 0, sizeof(*args));
1576                 args->ar_quota = GFS2_QUOTA_DEFAULT;
1577                 args->ar_data = GFS2_DATA_DEFAULT;
1578                 args->ar_commit = 30;
1579                 args->ar_statfs_quantum = 30;
1580                 args->ar_quota_quantum = 60;
1581                 args->ar_errors = GFS2_ERRORS_DEFAULT;
1582         }
1583         fc->fs_private = args;
1584         fc->ops = &gfs2_context_ops;
1585         return 0;
1586 }
1587
1588 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1589 {
1590         return -EINVAL;
1591 }
1592
1593 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1594 {
1595         return (fc->sget_key == s->s_bdev);
1596 }
1597
1598 static int gfs2_meta_get_tree(struct fs_context *fc)
1599 {
1600         struct super_block *s;
1601         struct gfs2_sbd *sdp;
1602         struct path path;
1603         int error;
1604
1605         if (!fc->source || !*fc->source)
1606                 return -EINVAL;
1607
1608         error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1609         if (error) {
1610                 pr_warn("path_lookup on %s returned error %d\n",
1611                         fc->source, error);
1612                 return error;
1613         }
1614         fc->fs_type = &gfs2_fs_type;
1615         fc->sget_key = path.dentry->d_sb->s_bdev;
1616         s = sget_fc(fc, test_meta_super, set_meta_super);
1617         path_put(&path);
1618         if (IS_ERR(s)) {
1619                 pr_warn("gfs2 mount does not exist\n");
1620                 return PTR_ERR(s);
1621         }
1622         if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1623                 deactivate_locked_super(s);
1624                 return -EBUSY;
1625         }
1626         sdp = s->s_fs_info;
1627         fc->root = dget(sdp->sd_master_dir);
1628         return 0;
1629 }
1630
1631 static const struct fs_context_operations gfs2_meta_context_ops = {
1632         .free        = gfs2_fc_free,
1633         .get_tree    = gfs2_meta_get_tree,
1634 };
1635
1636 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1637 {
1638         int ret = gfs2_init_fs_context(fc);
1639
1640         if (ret)
1641                 return ret;
1642
1643         fc->ops = &gfs2_meta_context_ops;
1644         return 0;
1645 }
1646
1647 static void gfs2_kill_sb(struct super_block *sb)
1648 {
1649         struct gfs2_sbd *sdp = sb->s_fs_info;
1650
1651         if (sdp == NULL) {
1652                 kill_block_super(sb);
1653                 return;
1654         }
1655
1656         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1657         dput(sdp->sd_root_dir);
1658         dput(sdp->sd_master_dir);
1659         sdp->sd_root_dir = NULL;
1660         sdp->sd_master_dir = NULL;
1661         shrink_dcache_sb(sb);
1662         kill_block_super(sb);
1663 }
1664
1665 struct file_system_type gfs2_fs_type = {
1666         .name = "gfs2",
1667         .fs_flags = FS_REQUIRES_DEV,
1668         .init_fs_context = gfs2_init_fs_context,
1669         .parameters = gfs2_fs_parameters,
1670         .kill_sb = gfs2_kill_sb,
1671         .owner = THIS_MODULE,
1672 };
1673 MODULE_ALIAS_FS("gfs2");
1674
1675 struct file_system_type gfs2meta_fs_type = {
1676         .name = "gfs2meta",
1677         .fs_flags = FS_REQUIRES_DEV,
1678         .init_fs_context = gfs2_meta_init_fs_context,
1679         .owner = THIS_MODULE,
1680 };
1681 MODULE_ALIAS_FS("gfs2meta");