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         if (sb->sb_bsize_shift != ffs(sb->sb_bsize) - 1) {
 186                 pr_warn("Invalid block size shift\n");
 187                 return -EINVAL;
 188         }
 189         return 0;
 190 }
 191
 192 static void end_bio_io_page(struct bio *bio)
 193 {
 194         struct page *page = bio->bi_private;
 195
 196         if (!bio->bi_status)
 197                 SetPageUptodate(page);
 198         else
 199                 pr_warn("error %d reading superblock\n", bio->bi_status);
 200         unlock_page(page);
 201 }
 202
 203 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
 204 {
 205         struct gfs2_sb_host *sb = &sdp->sd_sb;
 206         struct super_block *s = sdp->sd_vfs;
 207         const struct gfs2_sb *str = buf;
 208
 209         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
 210         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
 211         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
 212         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
 213         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
 214         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
 215         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
 216         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
 217         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
 218         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
 219         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
 220
 221         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
 222         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
 223         memcpy(&s->s_uuid, str->sb_uuid, 16);
 224 }
 225
 226 /**
 227  * gfs2_read_super - Read the gfs2 super block from disk
 228  * @sdp: The GFS2 super block
 229  * @sector: The location of the super block
 230  * @error: The error code to return
 231  *
 232  * This uses the bio functions to read the super block from disk
 233  * because we want to be 100% sure that we never read cached data.
 234  * A super block is read twice only during each GFS2 mount and is
 235  * never written to by the filesystem. The first time its read no
 236  * locks are held, and the only details which are looked at are those
 237  * relating to the locking protocol. Once locking is up and working,
 238  * the sb is read again under the lock to establish the location of
 239  * the master directory (contains pointers to journals etc) and the
 240  * root directory.
 241  *
 242  * Returns: 0 on success or error
 243  */
 244
 245 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
 246 {
 247         struct super_block *sb = sdp->sd_vfs;
 248         struct gfs2_sb *p;
 249         struct page *page;
 250         struct bio *bio;
 251
 252         page = alloc_page(GFP_NOFS);
 253         if (unlikely(!page))
 254                 return -ENOMEM;
 255
 256         ClearPageUptodate(page);
 257         ClearPageDirty(page);
 258         lock_page(page);
 259
 260         bio = bio_alloc(GFP_NOFS, 1);
 261         bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
 262         bio_set_dev(bio, sb->s_bdev);
 263         bio_add_page(bio, page, PAGE_SIZE, 0);
 264
 265         bio->bi_end_io = end_bio_io_page;
 266         bio->bi_private = page;
 267         bio_set_op_attrs(bio, REQ_OP_READ, REQ_META);
 268         submit_bio(bio);
 269         wait_on_page_locked(page);
 270         bio_put(bio);
 271         if (!PageUptodate(page)) {
 272                 __free_page(page);
 273                 return -EIO;
 274         }
 275         p = kmap(page);
 276         gfs2_sb_in(sdp, p);
 277         kunmap(page);
 278         __free_page(page);
 279         return gfs2_check_sb(sdp, silent);
 280 }
 281
 282 /**
 283  * gfs2_read_sb - Read super block
 284  * @sdp: The GFS2 superblock
 285  * @silent: Don't print message if mount fails
 286  *
 287  */
 288
 289 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
 290 {
 291         u32 hash_blocks, ind_blocks, leaf_blocks;
 292         u32 tmp_blocks;
 293         unsigned int x;
 294         int error;
 295
 296         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 297         if (error) {
 298                 if (!silent)
 299                         fs_err(sdp, "can't read superblock\n");
 300                 return error;
 301         }
 302
 303         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 304                                GFS2_BASIC_BLOCK_SHIFT;
 305         sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
 306         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 307                           sizeof(struct gfs2_dinode)) / sizeof(u64);
 308         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 309                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
 310         sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize -
 311                           sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
 312         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 313         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 314         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 315         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 316         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 317                                 sizeof(struct gfs2_meta_header)) /
 318                                 sizeof(struct gfs2_quota_change);
 319         sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
 320                                      sizeof(struct gfs2_meta_header))
 321                 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
 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, LM_FLAG_NOEXP | GL_NOCACHE,
 410                                   mount_gh);
 411         if (error) {
 412                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 413                 goto fail;
 414         }
 415
 416         error = gfs2_glock_nq_num(sdp,
 417                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 418                                   LM_ST_SHARED,
 419                                   LM_FLAG_NOEXP | GL_EXACT,
 420                                   &sdp->sd_live_gh);
 421         if (error) {
 422                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 423                 goto fail_mount;
 424         }
 425
 426         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 427                                CREATE, &sdp->sd_rename_gl);
 428         if (error) {
 429                 fs_err(sdp, "can't create rename glock: %d\n", error);
 430                 goto fail_live;
 431         }
 432
 433         error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
 434                                CREATE, &sdp->sd_freeze_gl);
 435         if (error) {
 436                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 437                 goto fail_rename;
 438         }
 439
 440         return 0;
 441
 442 fail_trans:
 443         gfs2_glock_put(sdp->sd_freeze_gl);
 444 fail_rename:
 445         gfs2_glock_put(sdp->sd_rename_gl);
 446 fail_live:
 447         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 448 fail_mount:
 449         gfs2_glock_dq_uninit(mount_gh);
 450 fail:
 451         return error;
 452 }
 453
 454 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
 455                             u64 no_addr, const char *name)
 456 {
 457         struct gfs2_sbd *sdp = sb->s_fs_info;
 458         struct dentry *dentry;
 459         struct inode *inode;
 460
 461         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
 462                                   GFS2_BLKST_FREE /* ignore */);
 463         if (IS_ERR(inode)) {
 464                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
 465                 return PTR_ERR(inode);
 466         }
 467         dentry = d_make_root(inode);
 468         if (!dentry) {
 469                 fs_err(sdp, "can't alloc %s dentry\n", name);
 470                 return -ENOMEM;
 471         }
 472         *dptr = dentry;
 473         return 0;
 474 }
 475
 476 static int init_sb(struct gfs2_sbd *sdp, int silent)
 477 {
 478         struct super_block *sb = sdp->sd_vfs;
 479         struct gfs2_holder sb_gh;
 480         u64 no_addr;
 481         int ret;
 482
 483         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 484                                 LM_ST_SHARED, 0, &sb_gh);
 485         if (ret) {
 486                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
 487                 return ret;
 488         }
 489
 490         ret = gfs2_read_sb(sdp, silent);
 491         if (ret) {
 492                 fs_err(sdp, "can't read superblock: %d\n", ret);
 493                 goto out;
 494         }
 495
 496         /* Set up the buffer cache and SB for real */
 497         if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
 498                 ret = -EINVAL;
 499                 fs_err(sdp, "FS block size (%u) is too small for device "
 500                        "block size (%u)\n",
 501                        sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
 502                 goto out;
 503         }
 504         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 505                 ret = -EINVAL;
 506                 fs_err(sdp, "FS block size (%u) is too big for machine "
 507                        "page size (%u)\n",
 508                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 509                 goto out;
 510         }
 511         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 512
 513         /* Get the root inode */
 514         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 515         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 516         if (ret)
 517                 goto out;
 518
 519         /* Get the master inode */
 520         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 521         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 522         if (ret) {
 523                 dput(sdp->sd_root_dir);
 524                 goto out;
 525         }
 526         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 527 out:
 528         gfs2_glock_dq_uninit(&sb_gh);
 529         return ret;
 530 }
 531
 532 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
 533 {
 534         char *message = "FIRSTMOUNT=Done";
 535         char *envp[] = { message, NULL };
 536
 537         fs_info(sdp, "first mount done, others may mount\n");
 538
 539         if (sdp->sd_lockstruct.ls_ops->lm_first_done)
 540                 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
 541
 542         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
 543 }
 544
 545 /**
 546  * gfs2_jindex_hold - Grab a lock on the jindex
 547  * @sdp: The GFS2 superblock
 548  * @ji_gh: the holder for the jindex glock
 549  *
 550  * Returns: errno
 551  */
 552
 553 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 554 {
 555         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
 556         struct qstr name;
 557         char buf[20];
 558         struct gfs2_jdesc *jd;
 559         int error;
 560
 561         name.name = buf;
 562
 563         mutex_lock(&sdp->sd_jindex_mutex);
 564
 565         for (;;) {
 566                 struct gfs2_inode *jip;
 567
 568                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
 569                 if (error)
 570                         break;
 571
 572                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
 573                 name.hash = gfs2_disk_hash(name.name, name.len);
 574
 575                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
 576                 if (error == -ENOENT) {
 577                         error = 0;
 578                         break;
 579                 }
 580
 581                 gfs2_glock_dq_uninit(ji_gh);
 582
 583                 if (error)
 584                         break;
 585
 586                 error = -ENOMEM;
 587                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
 588                 if (!jd)
 589                         break;
 590
 591                 INIT_LIST_HEAD(&jd->extent_list);
 592                 INIT_LIST_HEAD(&jd->jd_revoke_list);
 593
 594                 INIT_WORK(&jd->jd_work, gfs2_recover_func);
 595                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
 596                 if (IS_ERR_OR_NULL(jd->jd_inode)) {
 597                         if (!jd->jd_inode)
 598                                 error = -ENOENT;
 599                         else
 600                                 error = PTR_ERR(jd->jd_inode);
 601                         kfree(jd);
 602                         break;
 603                 }
 604
 605                 spin_lock(&sdp->sd_jindex_spin);
 606                 jd->jd_jid = sdp->sd_journals++;
 607                 jip = GFS2_I(jd->jd_inode);
 608                 jd->jd_no_addr = jip->i_no_addr;
 609                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
 610                 spin_unlock(&sdp->sd_jindex_spin);
 611         }
 612
 613         mutex_unlock(&sdp->sd_jindex_mutex);
 614
 615         return error;
 616 }
 617
 618 /**
 619  * init_statfs - look up and initialize master and local (per node) statfs inodes
 620  * @sdp: The GFS2 superblock
 621  *
 622  * This should be called after the jindex is initialized in init_journal() and
 623  * before gfs2_journal_recovery() is called because we need to be able to write
 624  * to these inodes during recovery.
 625  *
 626  * Returns: errno
 627  */
 628 static int init_statfs(struct gfs2_sbd *sdp)
 629 {
 630         int error = 0;
 631         struct inode *master = d_inode(sdp->sd_master_dir);
 632         struct inode *pn = NULL;
 633         char buf[30];
 634         struct gfs2_jdesc *jd;
 635         struct gfs2_inode *ip;
 636
 637         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 638         if (IS_ERR(sdp->sd_statfs_inode)) {
 639                 error = PTR_ERR(sdp->sd_statfs_inode);
 640                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 641                 goto out;
 642         }
 643         if (sdp->sd_args.ar_spectator)
 644                 goto out;
 645
 646         pn = gfs2_lookup_simple(master, "per_node");
 647         if (IS_ERR(pn)) {
 648                 error = PTR_ERR(pn);
 649                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 650                 goto put_statfs;
 651         }
 652
 653         /* For each jid, lookup the corresponding local statfs inode in the
 654          * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */
 655         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 656                 struct local_statfs_inode *lsi =
 657                         kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS);
 658                 if (!lsi) {
 659                         error = -ENOMEM;
 660                         goto free_local;
 661                 }
 662                 sprintf(buf, "statfs_change%u", jd->jd_jid);
 663                 lsi->si_sc_inode = gfs2_lookup_simple(pn, buf);
 664                 if (IS_ERR(lsi->si_sc_inode)) {
 665                         error = PTR_ERR(lsi->si_sc_inode);
 666                         fs_err(sdp, "can't find local \"sc\" file#%u: %d\n",
 667                                jd->jd_jid, error);
 668                         kfree(lsi);
 669                         goto free_local;
 670                 }
 671                 lsi->si_jid = jd->jd_jid;
 672                 if (jd->jd_jid == sdp->sd_jdesc->jd_jid)
 673                         sdp->sd_sc_inode = lsi->si_sc_inode;
 674
 675                 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list);
 676         }
 677
 678         iput(pn);
 679         pn = NULL;
 680         ip = GFS2_I(sdp->sd_sc_inode);
 681         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 682                                    &sdp->sd_sc_gh);
 683         if (error) {
 684                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 685                 goto free_local;
 686         }
 687         return 0;
 688
 689 free_local:
 690         free_local_statfs_inodes(sdp);
 691         iput(pn);
 692 put_statfs:
 693         iput(sdp->sd_statfs_inode);
 694 out:
 695         return error;
 696 }
 697
 698 /* Uninitialize and free up memory used by the list of statfs inodes */
 699 static void uninit_statfs(struct gfs2_sbd *sdp)
 700 {
 701         if (!sdp->sd_args.ar_spectator) {
 702                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 703                 free_local_statfs_inodes(sdp);
 704         }
 705         iput(sdp->sd_statfs_inode);
 706 }
 707
 708 static int init_journal(struct gfs2_sbd *sdp, int undo)
 709 {
 710         struct inode *master = d_inode(sdp->sd_master_dir);
 711         struct gfs2_holder ji_gh;
 712         struct gfs2_inode *ip;
 713         int jindex = 1;
 714         int error = 0;
 715
 716         if (undo) {
 717                 jindex = 0;
 718                 goto fail_statfs;
 719         }
 720
 721         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
 722         if (IS_ERR(sdp->sd_jindex)) {
 723                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 724                 return PTR_ERR(sdp->sd_jindex);
 725         }
 726
 727         /* Load in the journal index special file */
 728
 729         error = gfs2_jindex_hold(sdp, &ji_gh);
 730         if (error) {
 731                 fs_err(sdp, "can't read journal index: %d\n", error);
 732                 goto fail;
 733         }
 734
 735         error = -EUSERS;
 736         if (!gfs2_jindex_size(sdp)) {
 737                 fs_err(sdp, "no journals!\n");
 738                 goto fail_jindex;
 739         }
 740
 741         atomic_set(&sdp->sd_log_blks_needed, 0);
 742         if (sdp->sd_args.ar_spectator) {
 743                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 744                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 745                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 746                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 747         } else {
 748                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 749                         fs_err(sdp, "can't mount journal #%u\n",
 750                                sdp->sd_lockstruct.ls_jid);
 751                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 752                                gfs2_jindex_size(sdp),
 753                                gfs2_jindex_size(sdp) - 1);
 754                         goto fail_jindex;
 755                 }
 756                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 757
 758                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 759                                           &gfs2_journal_glops,
 760                                           LM_ST_EXCLUSIVE,
 761                                           LM_FLAG_NOEXP | GL_NOCACHE,
 762                                           &sdp->sd_journal_gh);
 763                 if (error) {
 764                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 765                         goto fail_jindex;
 766                 }
 767
 768                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 769                 sdp->sd_jinode_gl = ip->i_gl;
 770                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 771                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 772                                            &sdp->sd_jinode_gh);
 773                 if (error) {
 774                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 775                                error);
 776                         goto fail_journal_gh;
 777                 }
 778
 779                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 780                 if (error) {
 781                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 782                                sdp->sd_jdesc->jd_jid, error);
 783                         goto fail_jinode_gh;
 784                 }
 785                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 786                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 787                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 788
 789                 /* Map the extents for this journal's blocks */
 790                 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
 791         }
 792         trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
 793
 794         /* Lookup statfs inodes here so journal recovery can use them. */
 795         error = init_statfs(sdp);
 796         if (error)
 797                 goto fail_jinode_gh;
 798
 799         if (sdp->sd_lockstruct.ls_first) {
 800                 unsigned int x;
 801                 for (x = 0; x < sdp->sd_journals; x++) {
 802                         struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
 803
 804                         if (sdp->sd_args.ar_spectator) {
 805                                 error = check_journal_clean(sdp, jd, true);
 806                                 if (error)
 807                                         goto fail_statfs;
 808                                 continue;
 809                         }
 810                         error = gfs2_recover_journal(jd, true);
 811                         if (error) {
 812                                 fs_err(sdp, "error recovering journal %u: %d\n",
 813                                        x, error);
 814                                 goto fail_statfs;
 815                         }
 816                 }
 817
 818                 gfs2_others_may_mount(sdp);
 819         } else if (!sdp->sd_args.ar_spectator) {
 820                 error = gfs2_recover_journal(sdp->sd_jdesc, true);
 821                 if (error) {
 822                         fs_err(sdp, "error recovering my journal: %d\n", error);
 823                         goto fail_statfs;
 824                 }
 825         }
 826
 827         sdp->sd_log_idle = 1;
 828         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 829         gfs2_glock_dq_uninit(&ji_gh);
 830         jindex = 0;
 831         INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
 832         return 0;
 833
 834 fail_statfs:
 835         uninit_statfs(sdp);
 836 fail_jinode_gh:
 837         /* A withdraw may have done dq/uninit so now we need to check it */
 838         if (!sdp->sd_args.ar_spectator &&
 839             gfs2_holder_initialized(&sdp->sd_jinode_gh))
 840                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 841 fail_journal_gh:
 842         if (!sdp->sd_args.ar_spectator &&
 843             gfs2_holder_initialized(&sdp->sd_journal_gh))
 844                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 845 fail_jindex:
 846         gfs2_jindex_free(sdp);
 847         if (jindex)
 848                 gfs2_glock_dq_uninit(&ji_gh);
 849 fail:
 850         iput(sdp->sd_jindex);
 851         return error;
 852 }
 853
 854 static struct lock_class_key gfs2_quota_imutex_key;
 855
 856 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 857 {
 858         int error = 0;
 859         struct inode *master = d_inode(sdp->sd_master_dir);
 860
 861         if (undo)
 862                 goto fail_qinode;
 863
 864         error = init_journal(sdp, undo);
 865         complete_all(&sdp->sd_journal_ready);
 866         if (error)
 867                 goto fail;
 868
 869         /* Read in the resource index inode */
 870         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 871         if (IS_ERR(sdp->sd_rindex)) {
 872                 error = PTR_ERR(sdp->sd_rindex);
 873                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 874                 goto fail_journal;
 875         }
 876         sdp->sd_rindex_uptodate = 0;
 877
 878         /* Read in the quota inode */
 879         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 880         if (IS_ERR(sdp->sd_quota_inode)) {
 881                 error = PTR_ERR(sdp->sd_quota_inode);
 882                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 883                 goto fail_rindex;
 884         }
 885         /*
 886          * i_rwsem on quota files is special. Since this inode is hidden system
 887          * file, we are safe to define locking ourselves.
 888          */
 889         lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
 890                           &gfs2_quota_imutex_key);
 891
 892         error = gfs2_rindex_update(sdp);
 893         if (error)
 894                 goto fail_qinode;
 895
 896         return 0;
 897
 898 fail_qinode:
 899         iput(sdp->sd_quota_inode);
 900 fail_rindex:
 901         gfs2_clear_rgrpd(sdp);
 902         iput(sdp->sd_rindex);
 903 fail_journal:
 904         init_journal(sdp, UNDO);
 905 fail:
 906         return error;
 907 }
 908
 909 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 910 {
 911         struct inode *pn = NULL;
 912         char buf[30];
 913         int error = 0;
 914         struct gfs2_inode *ip;
 915         struct inode *master = d_inode(sdp->sd_master_dir);
 916
 917         if (sdp->sd_args.ar_spectator)
 918                 return 0;
 919
 920         if (undo)
 921                 goto fail_qc_gh;
 922
 923         pn = gfs2_lookup_simple(master, "per_node");
 924         if (IS_ERR(pn)) {
 925                 error = PTR_ERR(pn);
 926                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 927                 return error;
 928         }
 929
 930         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 931         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 932         if (IS_ERR(sdp->sd_qc_inode)) {
 933                 error = PTR_ERR(sdp->sd_qc_inode);
 934                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 935                 goto fail_ut_i;
 936         }
 937
 938         iput(pn);
 939         pn = NULL;
 940
 941         ip = GFS2_I(sdp->sd_qc_inode);
 942         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 943                                    &sdp->sd_qc_gh);
 944         if (error) {
 945                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 946                 goto fail_qc_i;
 947         }
 948
 949         return 0;
 950
 951 fail_qc_gh:
 952         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 953 fail_qc_i:
 954         iput(sdp->sd_qc_inode);
 955 fail_ut_i:
 956         iput(pn);
 957         return error;
 958 }
 959
 960 static const match_table_t nolock_tokens = {
 961         { Opt_jid, "jid=%d", },
 962         { Opt_err, NULL },
 963 };
 964
 965 static const struct lm_lockops nolock_ops = {
 966         .lm_proto_name = "lock_nolock",
 967         .lm_put_lock = gfs2_glock_free,
 968         .lm_tokens = &nolock_tokens,
 969 };
 970
 971 /**
 972  * gfs2_lm_mount - mount a locking protocol
 973  * @sdp: the filesystem
 974  * @args: mount arguments
 975  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
 976  *
 977  * Returns: errno
 978  */
 979
 980 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
 981 {
 982         const struct lm_lockops *lm;
 983         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 984         struct gfs2_args *args = &sdp->sd_args;
 985         const char *proto = sdp->sd_proto_name;
 986         const char *table = sdp->sd_table_name;
 987         char *o, *options;
 988         int ret;
 989
 990         if (!strcmp("lock_nolock", proto)) {
 991                 lm = &nolock_ops;
 992                 sdp->sd_args.ar_localflocks = 1;
 993 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
 994         } else if (!strcmp("lock_dlm", proto)) {
 995                 lm = &gfs2_dlm_ops;
 996 #endif
 997         } else {
 998                 pr_info("can't find protocol %s\n", proto);
 999                 return -ENOENT;
1000         }
1001
1002         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1003
1004         ls->ls_ops = lm;
1005         ls->ls_first = 1;
1006
1007         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1008                 substring_t tmp[MAX_OPT_ARGS];
1009                 int token, option;
1010
1011                 if (!o || !*o)
1012                         continue;
1013
1014                 token = match_token(o, *lm->lm_tokens, tmp);
1015                 switch (token) {
1016                 case Opt_jid:
1017                         ret = match_int(&tmp[0], &option);
1018                         if (ret || option < 0)
1019                                 goto hostdata_error;
1020                         if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1021                                 ls->ls_jid = option;
1022                         break;
1023                 case Opt_id:
1024                 case Opt_nodir:
1025                         /* Obsolete, but left for backward compat purposes */
1026                         break;
1027                 case Opt_first:
1028                         ret = match_int(&tmp[0], &option);
1029                         if (ret || (option != 0 && option != 1))
1030                                 goto hostdata_error;
1031                         ls->ls_first = option;
1032                         break;
1033                 case Opt_err:
1034                 default:
1035 hostdata_error:
1036                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1037                         return -EINVAL;
1038                 }
1039         }
1040
1041         if (lm->lm_mount == NULL) {
1042                 fs_info(sdp, "Now mounting FS...\n");
1043                 complete_all(&sdp->sd_locking_init);
1044                 return 0;
1045         }
1046         ret = lm->lm_mount(sdp, table);
1047         if (ret == 0)
1048                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1049         complete_all(&sdp->sd_locking_init);
1050         return ret;
1051 }
1052
1053 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1054 {
1055         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1056         if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount)
1057                 lm->lm_unmount(sdp);
1058 }
1059
1060 static int wait_on_journal(struct gfs2_sbd *sdp)
1061 {
1062         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1063                 return 0;
1064
1065         return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1066                 ? -EINTR : 0;
1067 }
1068
1069 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1070 {
1071         struct super_block *sb = sdp->sd_vfs;
1072         char ro[20];
1073         char spectator[20];
1074         char *envp[] = { ro, spectator, NULL };
1075         sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1076         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1077         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1078 }
1079
1080 static int init_threads(struct gfs2_sbd *sdp)
1081 {
1082         struct task_struct *p;
1083         int error = 0;
1084
1085         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
1086         if (IS_ERR(p)) {
1087                 error = PTR_ERR(p);
1088                 fs_err(sdp, "can't start logd thread: %d\n", error);
1089                 return error;
1090         }
1091         sdp->sd_logd_process = p;
1092
1093         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
1094         if (IS_ERR(p)) {
1095                 error = PTR_ERR(p);
1096                 fs_err(sdp, "can't start quotad thread: %d\n", error);
1097                 goto fail;
1098         }
1099         sdp->sd_quotad_process = p;
1100         return 0;
1101
1102 fail:
1103         kthread_stop(sdp->sd_logd_process);
1104         sdp->sd_logd_process = NULL;
1105         return error;
1106 }
1107
1108 /**
1109  * gfs2_fill_super - Read in superblock
1110  * @sb: The VFS superblock
1111  * @args: Mount options
1112  * @silent: Don't complain if it's not a GFS2 filesystem
1113  *
1114  * Returns: -errno
1115  */
1116 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1117 {
1118         struct gfs2_args *args = fc->fs_private;
1119         int silent = fc->sb_flags & SB_SILENT;
1120         struct gfs2_sbd *sdp;
1121         struct gfs2_holder mount_gh;
1122         struct gfs2_holder freeze_gh;
1123         int error;
1124
1125         sdp = init_sbd(sb);
1126         if (!sdp) {
1127                 pr_warn("can't alloc struct gfs2_sbd\n");
1128                 return -ENOMEM;
1129         }
1130         sdp->sd_args = *args;
1131
1132         if (sdp->sd_args.ar_spectator) {
1133                 sb->s_flags |= SB_RDONLY;
1134                 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1135         }
1136         if (sdp->sd_args.ar_posix_acl)
1137                 sb->s_flags |= SB_POSIXACL;
1138         if (sdp->sd_args.ar_nobarrier)
1139                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1140
1141         sb->s_flags |= SB_NOSEC;
1142         sb->s_magic = GFS2_MAGIC;
1143         sb->s_op = &gfs2_super_ops;
1144         sb->s_d_op = &gfs2_dops;
1145         sb->s_export_op = &gfs2_export_ops;
1146         sb->s_xattr = gfs2_xattr_handlers;
1147         sb->s_qcop = &gfs2_quotactl_ops;
1148         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1149         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1150         sb->s_time_gran = 1;
1151         sb->s_maxbytes = MAX_LFS_FILESIZE;
1152
1153         /* Set up the buffer cache and fill in some fake block size values
1154            to allow us to read-in the on-disk superblock. */
1155         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1156         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1157         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1158                                GFS2_BASIC_BLOCK_SHIFT;
1159         sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1160
1161         sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1162         sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1163         if (sdp->sd_args.ar_statfs_quantum) {
1164                 sdp->sd_tune.gt_statfs_slow = 0;
1165                 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1166         } else {
1167                 sdp->sd_tune.gt_statfs_slow = 1;
1168                 sdp->sd_tune.gt_statfs_quantum = 30;
1169         }
1170
1171         error = init_names(sdp, silent);
1172         if (error)
1173                 goto fail_free;
1174
1175         snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1176
1177         error = gfs2_sys_fs_add(sdp);
1178         if (error)
1179                 goto fail_free;
1180
1181         gfs2_create_debugfs_file(sdp);
1182
1183         error = gfs2_lm_mount(sdp, silent);
1184         if (error)
1185                 goto fail_debug;
1186
1187         error = init_locking(sdp, &mount_gh, DO);
1188         if (error)
1189                 goto fail_lm;
1190
1191         error = init_sb(sdp, silent);
1192         if (error)
1193                 goto fail_locking;
1194
1195         error = wait_on_journal(sdp);
1196         if (error)
1197                 goto fail_sb;
1198
1199         /*
1200          * If user space has failed to join the cluster or some similar
1201          * failure has occurred, then the journal id will contain a
1202          * negative (error) number. This will then be returned to the
1203          * caller (of the mount syscall). We do this even for spectator
1204          * mounts (which just write a jid of 0 to indicate "ok" even though
1205          * the jid is unused in the spectator case)
1206          */
1207         if (sdp->sd_lockstruct.ls_jid < 0) {
1208                 error = sdp->sd_lockstruct.ls_jid;
1209                 sdp->sd_lockstruct.ls_jid = 0;
1210                 goto fail_sb;
1211         }
1212
1213         if (sdp->sd_args.ar_spectator)
1214                 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1215                          sdp->sd_table_name);
1216         else
1217                 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1218                          sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1219
1220         error = init_inodes(sdp, DO);
1221         if (error)
1222                 goto fail_sb;
1223
1224         error = init_per_node(sdp, DO);
1225         if (error)
1226                 goto fail_inodes;
1227
1228         error = gfs2_statfs_init(sdp);
1229         if (error) {
1230                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1231                 goto fail_per_node;
1232         }
1233
1234         if (!sb_rdonly(sb)) {
1235                 error = init_threads(sdp);
1236                 if (error) {
1237                         gfs2_withdraw_delayed(sdp);
1238                         goto fail_per_node;
1239                 }
1240         }
1241
1242         error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
1243         if (error)
1244                 goto fail_per_node;
1245
1246         if (!sb_rdonly(sb))
1247                 error = gfs2_make_fs_rw(sdp);
1248
1249         gfs2_freeze_unlock(&freeze_gh);
1250         if (error) {
1251                 if (sdp->sd_quotad_process)
1252                         kthread_stop(sdp->sd_quotad_process);
1253                 sdp->sd_quotad_process = NULL;
1254                 if (sdp->sd_logd_process)
1255                         kthread_stop(sdp->sd_logd_process);
1256                 sdp->sd_logd_process = NULL;
1257                 fs_err(sdp, "can't make FS RW: %d\n", error);
1258                 goto fail_per_node;
1259         }
1260         gfs2_glock_dq_uninit(&mount_gh);
1261         gfs2_online_uevent(sdp);
1262         return 0;
1263
1264 fail_per_node:
1265         init_per_node(sdp, UNDO);
1266 fail_inodes:
1267         init_inodes(sdp, UNDO);
1268 fail_sb:
1269         if (sdp->sd_root_dir)
1270                 dput(sdp->sd_root_dir);
1271         if (sdp->sd_master_dir)
1272                 dput(sdp->sd_master_dir);
1273         if (sb->s_root)
1274                 dput(sb->s_root);
1275         sb->s_root = NULL;
1276 fail_locking:
1277         init_locking(sdp, &mount_gh, UNDO);
1278 fail_lm:
1279         complete_all(&sdp->sd_journal_ready);
1280         gfs2_gl_hash_clear(sdp);
1281         gfs2_lm_unmount(sdp);
1282 fail_debug:
1283         gfs2_delete_debugfs_file(sdp);
1284         gfs2_sys_fs_del(sdp);
1285 fail_free:
1286         free_sbd(sdp);
1287         sb->s_fs_info = NULL;
1288         return error;
1289 }
1290
1291 /**
1292  * gfs2_get_tree - Get the GFS2 superblock and root directory
1293  * @fc: The filesystem context
1294  *
1295  * Returns: 0 or -errno on error
1296  */
1297 static int gfs2_get_tree(struct fs_context *fc)
1298 {
1299         struct gfs2_args *args = fc->fs_private;
1300         struct gfs2_sbd *sdp;
1301         int error;
1302
1303         error = get_tree_bdev(fc, gfs2_fill_super);
1304         if (error)
1305                 return error;
1306
1307         sdp = fc->root->d_sb->s_fs_info;
1308         dput(fc->root);
1309         if (args->ar_meta)
1310                 fc->root = dget(sdp->sd_master_dir);
1311         else
1312                 fc->root = dget(sdp->sd_root_dir);
1313         return 0;
1314 }
1315
1316 static void gfs2_fc_free(struct fs_context *fc)
1317 {
1318         struct gfs2_args *args = fc->fs_private;
1319
1320         kfree(args);
1321 }
1322
1323 enum gfs2_param {
1324         Opt_lockproto,
1325         Opt_locktable,
1326         Opt_hostdata,
1327         Opt_spectator,
1328         Opt_ignore_local_fs,
1329         Opt_localflocks,
1330         Opt_localcaching,
1331         Opt_debug,
1332         Opt_upgrade,
1333         Opt_acl,
1334         Opt_quota,
1335         Opt_quota_flag,
1336         Opt_suiddir,
1337         Opt_data,
1338         Opt_meta,
1339         Opt_discard,
1340         Opt_commit,
1341         Opt_errors,
1342         Opt_statfs_quantum,
1343         Opt_statfs_percent,
1344         Opt_quota_quantum,
1345         Opt_barrier,
1346         Opt_rgrplvb,
1347         Opt_loccookie,
1348 };
1349
1350 static const struct constant_table gfs2_param_quota[] = {
1351         {"off",        GFS2_QUOTA_OFF},
1352         {"account",    GFS2_QUOTA_ACCOUNT},
1353         {"on",         GFS2_QUOTA_ON},
1354         {}
1355 };
1356
1357 enum opt_data {
1358         Opt_data_writeback = GFS2_DATA_WRITEBACK,
1359         Opt_data_ordered   = GFS2_DATA_ORDERED,
1360 };
1361
1362 static const struct constant_table gfs2_param_data[] = {
1363         {"writeback",  Opt_data_writeback },
1364         {"ordered",    Opt_data_ordered },
1365         {}
1366 };
1367
1368 enum opt_errors {
1369         Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1370         Opt_errors_panic    = GFS2_ERRORS_PANIC,
1371 };
1372
1373 static const struct constant_table gfs2_param_errors[] = {
1374         {"withdraw",   Opt_errors_withdraw },
1375         {"panic",      Opt_errors_panic },
1376         {}
1377 };
1378
1379 static const struct fs_parameter_spec gfs2_fs_parameters[] = {
1380         fsparam_string ("lockproto",          Opt_lockproto),
1381         fsparam_string ("locktable",          Opt_locktable),
1382         fsparam_string ("hostdata",           Opt_hostdata),
1383         fsparam_flag   ("spectator",          Opt_spectator),
1384         fsparam_flag   ("norecovery",         Opt_spectator),
1385         fsparam_flag   ("ignore_local_fs",    Opt_ignore_local_fs),
1386         fsparam_flag   ("localflocks",        Opt_localflocks),
1387         fsparam_flag   ("localcaching",       Opt_localcaching),
1388         fsparam_flag_no("debug",              Opt_debug),
1389         fsparam_flag   ("upgrade",            Opt_upgrade),
1390         fsparam_flag_no("acl",                Opt_acl),
1391         fsparam_flag_no("suiddir",            Opt_suiddir),
1392         fsparam_enum   ("data",               Opt_data, gfs2_param_data),
1393         fsparam_flag   ("meta",               Opt_meta),
1394         fsparam_flag_no("discard",            Opt_discard),
1395         fsparam_s32    ("commit",             Opt_commit),
1396         fsparam_enum   ("errors",             Opt_errors, gfs2_param_errors),
1397         fsparam_s32    ("statfs_quantum",     Opt_statfs_quantum),
1398         fsparam_s32    ("statfs_percent",     Opt_statfs_percent),
1399         fsparam_s32    ("quota_quantum",      Opt_quota_quantum),
1400         fsparam_flag_no("barrier",            Opt_barrier),
1401         fsparam_flag_no("rgrplvb",            Opt_rgrplvb),
1402         fsparam_flag_no("loccookie",          Opt_loccookie),
1403         /* quota can be a flag or an enum so it gets special treatment */
1404         fsparam_flag_no("quota",              Opt_quota_flag),
1405         fsparam_enum("quota",                 Opt_quota, gfs2_param_quota),
1406         {}
1407 };
1408
1409 /* Parse a single mount parameter */
1410 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1411 {
1412         struct gfs2_args *args = fc->fs_private;
1413         struct fs_parse_result result;
1414         int o;
1415
1416         o = fs_parse(fc, gfs2_fs_parameters, param, &result);
1417         if (o < 0)
1418                 return o;
1419
1420         switch (o) {
1421         case Opt_lockproto:
1422                 strscpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1423                 break;
1424         case Opt_locktable:
1425                 strscpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1426                 break;
1427         case Opt_hostdata:
1428                 strscpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1429                 break;
1430         case Opt_spectator:
1431                 args->ar_spectator = 1;
1432                 break;
1433         case Opt_ignore_local_fs:
1434                 /* Retained for backwards compat only */
1435                 break;
1436         case Opt_localflocks:
1437                 args->ar_localflocks = 1;
1438                 break;
1439         case Opt_localcaching:
1440                 /* Retained for backwards compat only */
1441                 break;
1442         case Opt_debug:
1443                 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1444                         return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1445                 args->ar_debug = result.boolean;
1446                 break;
1447         case Opt_upgrade:
1448                 /* Retained for backwards compat only */
1449                 break;
1450         case Opt_acl:
1451                 args->ar_posix_acl = result.boolean;
1452                 break;
1453         case Opt_quota_flag:
1454                 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON;
1455                 break;
1456         case Opt_quota:
1457                 args->ar_quota = result.int_32;
1458                 break;
1459         case Opt_suiddir:
1460                 args->ar_suiddir = result.boolean;
1461                 break;
1462         case Opt_data:
1463                 /* The uint_32 result maps directly to GFS2_DATA_* */
1464                 args->ar_data = result.uint_32;
1465                 break;
1466         case Opt_meta:
1467                 args->ar_meta = 1;
1468                 break;
1469         case Opt_discard:
1470                 args->ar_discard = result.boolean;
1471                 break;
1472         case Opt_commit:
1473                 if (result.int_32 <= 0)
1474                         return invalfc(fc, "commit mount option requires a positive numeric argument");
1475                 args->ar_commit = result.int_32;
1476                 break;
1477         case Opt_statfs_quantum:
1478                 if (result.int_32 < 0)
1479                         return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument");
1480                 args->ar_statfs_quantum = result.int_32;
1481                 break;
1482         case Opt_quota_quantum:
1483                 if (result.int_32 <= 0)
1484                         return invalfc(fc, "quota_quantum mount option requires a positive numeric argument");
1485                 args->ar_quota_quantum = result.int_32;
1486                 break;
1487         case Opt_statfs_percent:
1488                 if (result.int_32 < 0 || result.int_32 > 100)
1489                         return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100");
1490                 args->ar_statfs_percent = result.int_32;
1491                 break;
1492         case Opt_errors:
1493                 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1494                         return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1495                 args->ar_errors = result.uint_32;
1496                 break;
1497         case Opt_barrier:
1498                 args->ar_nobarrier = result.boolean;
1499                 break;
1500         case Opt_rgrplvb:
1501                 args->ar_rgrplvb = result.boolean;
1502                 break;
1503         case Opt_loccookie:
1504                 args->ar_loccookie = result.boolean;
1505                 break;
1506         default:
1507                 return invalfc(fc, "invalid mount option: %s", param->key);
1508         }
1509         return 0;
1510 }
1511
1512 static int gfs2_reconfigure(struct fs_context *fc)
1513 {
1514         struct super_block *sb = fc->root->d_sb;
1515         struct gfs2_sbd *sdp = sb->s_fs_info;
1516         struct gfs2_args *oldargs = &sdp->sd_args;
1517         struct gfs2_args *newargs = fc->fs_private;
1518         struct gfs2_tune *gt = &sdp->sd_tune;
1519         int error = 0;
1520
1521         sync_filesystem(sb);
1522
1523         spin_lock(&gt->gt_spin);
1524         oldargs->ar_commit = gt->gt_logd_secs;
1525         oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1526         if (gt->gt_statfs_slow)
1527                 oldargs->ar_statfs_quantum = 0;
1528         else
1529                 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1530         spin_unlock(&gt->gt_spin);
1531
1532         if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1533                 errorfc(fc, "reconfiguration of locking protocol not allowed");
1534                 return -EINVAL;
1535         }
1536         if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1537                 errorfc(fc, "reconfiguration of lock table not allowed");
1538                 return -EINVAL;
1539         }
1540         if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1541                 errorfc(fc, "reconfiguration of host data not allowed");
1542                 return -EINVAL;
1543         }
1544         if (newargs->ar_spectator != oldargs->ar_spectator) {
1545                 errorfc(fc, "reconfiguration of spectator mode not allowed");
1546                 return -EINVAL;
1547         }
1548         if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1549                 errorfc(fc, "reconfiguration of localflocks not allowed");
1550                 return -EINVAL;
1551         }
1552         if (newargs->ar_meta != oldargs->ar_meta) {
1553                 errorfc(fc, "switching between gfs2 and gfs2meta not allowed");
1554                 return -EINVAL;
1555         }
1556         if (oldargs->ar_spectator)
1557                 fc->sb_flags |= SB_RDONLY;
1558
1559         if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1560                 struct gfs2_holder freeze_gh;
1561
1562                 error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
1563                 if (error)
1564                         return -EINVAL;
1565
1566                 if (fc->sb_flags & SB_RDONLY) {
1567                         error = gfs2_make_fs_ro(sdp);
1568                         if (error)
1569                                 errorfc(fc, "unable to remount read-only");
1570                 } else {
1571                         error = gfs2_make_fs_rw(sdp);
1572                         if (error)
1573                                 errorfc(fc, "unable to remount read-write");
1574                 }
1575                 gfs2_freeze_unlock(&freeze_gh);
1576         }
1577         sdp->sd_args = *newargs;
1578
1579         if (sdp->sd_args.ar_posix_acl)
1580                 sb->s_flags |= SB_POSIXACL;
1581         else
1582                 sb->s_flags &= ~SB_POSIXACL;
1583         if (sdp->sd_args.ar_nobarrier)
1584                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1585         else
1586                 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1587         spin_lock(&gt->gt_spin);
1588         gt->gt_logd_secs = newargs->ar_commit;
1589         gt->gt_quota_quantum = newargs->ar_quota_quantum;
1590         if (newargs->ar_statfs_quantum) {
1591                 gt->gt_statfs_slow = 0;
1592                 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1593         }
1594         else {
1595                 gt->gt_statfs_slow = 1;
1596                 gt->gt_statfs_quantum = 30;
1597         }
1598         spin_unlock(&gt->gt_spin);
1599
1600         gfs2_online_uevent(sdp);
1601         return error;
1602 }
1603
1604 static const struct fs_context_operations gfs2_context_ops = {
1605         .free        = gfs2_fc_free,
1606         .parse_param = gfs2_parse_param,
1607         .get_tree    = gfs2_get_tree,
1608         .reconfigure = gfs2_reconfigure,
1609 };
1610
1611 /* Set up the filesystem mount context */
1612 static int gfs2_init_fs_context(struct fs_context *fc)
1613 {
1614         struct gfs2_args *args;
1615
1616         args = kmalloc(sizeof(*args), GFP_KERNEL);
1617         if (args == NULL)
1618                 return -ENOMEM;
1619
1620         if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1621                 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1622
1623                 *args = sdp->sd_args;
1624         } else {
1625                 memset(args, 0, sizeof(*args));
1626                 args->ar_quota = GFS2_QUOTA_DEFAULT;
1627                 args->ar_data = GFS2_DATA_DEFAULT;
1628                 args->ar_commit = 30;
1629                 args->ar_statfs_quantum = 30;
1630                 args->ar_quota_quantum = 60;
1631                 args->ar_errors = GFS2_ERRORS_DEFAULT;
1632         }
1633         fc->fs_private = args;
1634         fc->ops = &gfs2_context_ops;
1635         return 0;
1636 }
1637
1638 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1639 {
1640         return -EINVAL;
1641 }
1642
1643 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1644 {
1645         return (fc->sget_key == s->s_bdev);
1646 }
1647
1648 static int gfs2_meta_get_tree(struct fs_context *fc)
1649 {
1650         struct super_block *s;
1651         struct gfs2_sbd *sdp;
1652         struct path path;
1653         int error;
1654
1655         if (!fc->source || !*fc->source)
1656                 return -EINVAL;
1657
1658         error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1659         if (error) {
1660                 pr_warn("path_lookup on %s returned error %d\n",
1661                         fc->source, error);
1662                 return error;
1663         }
1664         fc->fs_type = &gfs2_fs_type;
1665         fc->sget_key = path.dentry->d_sb->s_bdev;
1666         s = sget_fc(fc, test_meta_super, set_meta_super);
1667         path_put(&path);
1668         if (IS_ERR(s)) {
1669                 pr_warn("gfs2 mount does not exist\n");
1670                 return PTR_ERR(s);
1671         }
1672         if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1673                 deactivate_locked_super(s);
1674                 return -EBUSY;
1675         }
1676         sdp = s->s_fs_info;
1677         fc->root = dget(sdp->sd_master_dir);
1678         return 0;
1679 }
1680
1681 static const struct fs_context_operations gfs2_meta_context_ops = {
1682         .free        = gfs2_fc_free,
1683         .get_tree    = gfs2_meta_get_tree,
1684 };
1685
1686 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1687 {
1688         int ret = gfs2_init_fs_context(fc);
1689
1690         if (ret)
1691                 return ret;
1692
1693         fc->ops = &gfs2_meta_context_ops;
1694         return 0;
1695 }
1696
1697 static void gfs2_kill_sb(struct super_block *sb)
1698 {
1699         struct gfs2_sbd *sdp = sb->s_fs_info;
1700
1701         if (sdp == NULL) {
1702                 kill_block_super(sb);
1703                 return;
1704         }
1705
1706         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1707         dput(sdp->sd_root_dir);
1708         dput(sdp->sd_master_dir);
1709         sdp->sd_root_dir = NULL;
1710         sdp->sd_master_dir = NULL;
1711         shrink_dcache_sb(sb);
1712         kill_block_super(sb);
1713 }
1714
1715 struct file_system_type gfs2_fs_type = {
1716         .name = "gfs2",
1717         .fs_flags = FS_REQUIRES_DEV,
1718         .init_fs_context = gfs2_init_fs_context,
1719         .parameters = gfs2_fs_parameters,
1720         .kill_sb = gfs2_kill_sb,
1721         .owner = THIS_MODULE,
1722 };
1723 MODULE_ALIAS_FS("gfs2");
1724
1725 struct file_system_type gfs2meta_fs_type = {
1726         .name = "gfs2meta",
1727         .fs_flags = FS_REQUIRES_DEV,
1728         .init_fs_context = gfs2_meta_init_fs_context,
1729         .owner = THIS_MODULE,
1730 };
1731 MODULE_ALIAS_FS("gfs2meta");