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/fs/gfs2/ops_fstype.c

https://bitbucket.org/jdstroy/ipaq214
C | 1354 lines | 1052 code | 201 blank | 101 comment | 166 complexity | 5f313ad3f117a43236cfd6be116f513c MD5 | raw file
   1/*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License version 2.
   8 */
   9
  10#include <linux/sched.h>
  11#include <linux/slab.h>
  12#include <linux/spinlock.h>
  13#include <linux/completion.h>
  14#include <linux/buffer_head.h>
  15#include <linux/blkdev.h>
  16#include <linux/kthread.h>
  17#include <linux/namei.h>
  18#include <linux/mount.h>
  19#include <linux/gfs2_ondisk.h>
  20
  21#include "gfs2.h"
  22#include "incore.h"
  23#include "bmap.h"
  24#include "glock.h"
  25#include "glops.h"
  26#include "inode.h"
  27#include "recovery.h"
  28#include "rgrp.h"
  29#include "super.h"
  30#include "sys.h"
  31#include "util.h"
  32#include "log.h"
  33#include "quota.h"
  34#include "dir.h"
  35
  36#define DO 0
  37#define UNDO 1
  38
  39static const u32 gfs2_old_fs_formats[] = {
  40        0
  41};
  42
  43static const u32 gfs2_old_multihost_formats[] = {
  44        0
  45};
  46
  47/**
  48 * gfs2_tune_init - Fill a gfs2_tune structure with default values
  49 * @gt: tune
  50 *
  51 */
  52
  53static void gfs2_tune_init(struct gfs2_tune *gt)
  54{
  55	spin_lock_init(&gt->gt_spin);
  56
  57	gt->gt_incore_log_blocks = 1024;
  58	gt->gt_log_flush_secs = 60;
  59	gt->gt_recoverd_secs = 60;
  60	gt->gt_logd_secs = 1;
  61	gt->gt_quota_simul_sync = 64;
  62	gt->gt_quota_warn_period = 10;
  63	gt->gt_quota_scale_num = 1;
  64	gt->gt_quota_scale_den = 1;
  65	gt->gt_quota_quantum = 60;
  66	gt->gt_new_files_jdata = 0;
  67	gt->gt_max_readahead = 1 << 18;
  68	gt->gt_stall_secs = 600;
  69	gt->gt_complain_secs = 10;
  70	gt->gt_statfs_quantum = 30;
  71	gt->gt_statfs_slow = 0;
  72}
  73
  74static struct gfs2_sbd *init_sbd(struct super_block *sb)
  75{
  76	struct gfs2_sbd *sdp;
  77
  78	sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  79	if (!sdp)
  80		return NULL;
  81
  82	sb->s_fs_info = sdp;
  83	sdp->sd_vfs = sb;
  84
  85	gfs2_tune_init(&sdp->sd_tune);
  86
  87	mutex_init(&sdp->sd_inum_mutex);
  88	spin_lock_init(&sdp->sd_statfs_spin);
  89
  90	spin_lock_init(&sdp->sd_rindex_spin);
  91	mutex_init(&sdp->sd_rindex_mutex);
  92	INIT_LIST_HEAD(&sdp->sd_rindex_list);
  93	INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
  94
  95	INIT_LIST_HEAD(&sdp->sd_jindex_list);
  96	spin_lock_init(&sdp->sd_jindex_spin);
  97	mutex_init(&sdp->sd_jindex_mutex);
  98
  99	INIT_LIST_HEAD(&sdp->sd_quota_list);
 100	mutex_init(&sdp->sd_quota_mutex);
 101	init_waitqueue_head(&sdp->sd_quota_wait);
 102	INIT_LIST_HEAD(&sdp->sd_trunc_list);
 103	spin_lock_init(&sdp->sd_trunc_lock);
 104
 105	spin_lock_init(&sdp->sd_log_lock);
 106
 107	INIT_LIST_HEAD(&sdp->sd_log_le_buf);
 108	INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
 109	INIT_LIST_HEAD(&sdp->sd_log_le_rg);
 110	INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
 111	INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
 112
 113	mutex_init(&sdp->sd_log_reserve_mutex);
 114	INIT_LIST_HEAD(&sdp->sd_ail1_list);
 115	INIT_LIST_HEAD(&sdp->sd_ail2_list);
 116
 117	init_rwsem(&sdp->sd_log_flush_lock);
 118	atomic_set(&sdp->sd_log_in_flight, 0);
 119	init_waitqueue_head(&sdp->sd_log_flush_wait);
 120
 121	INIT_LIST_HEAD(&sdp->sd_revoke_list);
 122
 123	mutex_init(&sdp->sd_freeze_lock);
 124
 125	return sdp;
 126}
 127
 128
 129/**
 130 * gfs2_check_sb - Check superblock
 131 * @sdp: the filesystem
 132 * @sb: The superblock
 133 * @silent: Don't print a message if the check fails
 134 *
 135 * Checks the version code of the FS is one that we understand how to
 136 * read and that the sizes of the various on-disk structures have not
 137 * changed.
 138 */
 139
 140static int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
 141{
 142	unsigned int x;
 143
 144	if (sb->sb_magic != GFS2_MAGIC ||
 145	    sb->sb_type != GFS2_METATYPE_SB) {
 146		if (!silent)
 147			printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
 148		return -EINVAL;
 149	}
 150
 151	/*  If format numbers match exactly, we're done.  */
 152
 153	if (sb->sb_fs_format == GFS2_FORMAT_FS &&
 154	    sb->sb_multihost_format == GFS2_FORMAT_MULTI)
 155		return 0;
 156
 157	if (sb->sb_fs_format != GFS2_FORMAT_FS) {
 158		for (x = 0; gfs2_old_fs_formats[x]; x++)
 159			if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
 160				break;
 161
 162		if (!gfs2_old_fs_formats[x]) {
 163			printk(KERN_WARNING
 164			       "GFS2: code version (%u, %u) is incompatible "
 165			       "with ondisk format (%u, %u)\n",
 166			       GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 167			       sb->sb_fs_format, sb->sb_multihost_format);
 168			printk(KERN_WARNING
 169			       "GFS2: I don't know how to upgrade this FS\n");
 170			return -EINVAL;
 171		}
 172	}
 173
 174	if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
 175		for (x = 0; gfs2_old_multihost_formats[x]; x++)
 176			if (gfs2_old_multihost_formats[x] ==
 177			    sb->sb_multihost_format)
 178				break;
 179
 180		if (!gfs2_old_multihost_formats[x]) {
 181			printk(KERN_WARNING
 182			       "GFS2: code version (%u, %u) is incompatible "
 183			       "with ondisk format (%u, %u)\n",
 184			       GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 185			       sb->sb_fs_format, sb->sb_multihost_format);
 186			printk(KERN_WARNING
 187			       "GFS2: I don't know how to upgrade this FS\n");
 188			return -EINVAL;
 189		}
 190	}
 191
 192	if (!sdp->sd_args.ar_upgrade) {
 193		printk(KERN_WARNING
 194		       "GFS2: code version (%u, %u) is incompatible "
 195		       "with ondisk format (%u, %u)\n",
 196		       GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 197		       sb->sb_fs_format, sb->sb_multihost_format);
 198		printk(KERN_INFO
 199		       "GFS2: Use the \"upgrade\" mount option to upgrade "
 200		       "the FS\n");
 201		printk(KERN_INFO "GFS2: See the manual for more details\n");
 202		return -EINVAL;
 203	}
 204
 205	return 0;
 206}
 207
 208static void end_bio_io_page(struct bio *bio, int error)
 209{
 210	struct page *page = bio->bi_private;
 211
 212	if (!error)
 213		SetPageUptodate(page);
 214	else
 215		printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
 216	unlock_page(page);
 217}
 218
 219static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
 220{
 221	const struct gfs2_sb *str = buf;
 222
 223	sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
 224	sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
 225	sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
 226	sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
 227	sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
 228	sb->sb_bsize = be32_to_cpu(str->sb_bsize);
 229	sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
 230	sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
 231	sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
 232	sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
 233	sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
 234
 235	memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
 236	memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
 237	memcpy(sb->sb_uuid, str->sb_uuid, 16);
 238}
 239
 240/**
 241 * gfs2_read_super - Read the gfs2 super block from disk
 242 * @sdp: The GFS2 super block
 243 * @sector: The location of the super block
 244 * @error: The error code to return
 245 *
 246 * This uses the bio functions to read the super block from disk
 247 * because we want to be 100% sure that we never read cached data.
 248 * A super block is read twice only during each GFS2 mount and is
 249 * never written to by the filesystem. The first time its read no
 250 * locks are held, and the only details which are looked at are those
 251 * relating to the locking protocol. Once locking is up and working,
 252 * the sb is read again under the lock to establish the location of
 253 * the master directory (contains pointers to journals etc) and the
 254 * root directory.
 255 *
 256 * Returns: 0 on success or error
 257 */
 258
 259static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
 260{
 261	struct super_block *sb = sdp->sd_vfs;
 262	struct gfs2_sb *p;
 263	struct page *page;
 264	struct bio *bio;
 265
 266	page = alloc_page(GFP_NOFS);
 267	if (unlikely(!page))
 268		return -ENOBUFS;
 269
 270	ClearPageUptodate(page);
 271	ClearPageDirty(page);
 272	lock_page(page);
 273
 274	bio = bio_alloc(GFP_NOFS, 1);
 275	bio->bi_sector = sector * (sb->s_blocksize >> 9);
 276	bio->bi_bdev = sb->s_bdev;
 277	bio_add_page(bio, page, PAGE_SIZE, 0);
 278
 279	bio->bi_end_io = end_bio_io_page;
 280	bio->bi_private = page;
 281	submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
 282	wait_on_page_locked(page);
 283	bio_put(bio);
 284	if (!PageUptodate(page)) {
 285		__free_page(page);
 286		return -EIO;
 287	}
 288	p = kmap(page);
 289	gfs2_sb_in(&sdp->sd_sb, p);
 290	kunmap(page);
 291	__free_page(page);
 292	return 0;
 293}
 294
 295/**
 296 * gfs2_read_sb - Read super block
 297 * @sdp: The GFS2 superblock
 298 * @silent: Don't print message if mount fails
 299 *
 300 */
 301
 302static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
 303{
 304	u32 hash_blocks, ind_blocks, leaf_blocks;
 305	u32 tmp_blocks;
 306	unsigned int x;
 307	int error;
 308
 309	error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 310	if (error) {
 311		if (!silent)
 312			fs_err(sdp, "can't read superblock\n");
 313		return error;
 314	}
 315
 316	error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 317	if (error)
 318		return error;
 319
 320	sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 321			       GFS2_BASIC_BLOCK_SHIFT;
 322	sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 323	sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 324			  sizeof(struct gfs2_dinode)) / sizeof(u64);
 325	sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 326			  sizeof(struct gfs2_meta_header)) / sizeof(u64);
 327	sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 328	sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 329	sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 330	sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 331	sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 332				sizeof(struct gfs2_meta_header)) /
 333			        sizeof(struct gfs2_quota_change);
 334
 335	/* Compute maximum reservation required to add a entry to a directory */
 336
 337	hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
 338			     sdp->sd_jbsize);
 339
 340	ind_blocks = 0;
 341	for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
 342		tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
 343		ind_blocks += tmp_blocks;
 344	}
 345
 346	leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
 347
 348	sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
 349
 350	sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
 351				sizeof(struct gfs2_dinode);
 352	sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
 353	for (x = 2;; x++) {
 354		u64 space, d;
 355		u32 m;
 356
 357		space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
 358		d = space;
 359		m = do_div(d, sdp->sd_inptrs);
 360
 361		if (d != sdp->sd_heightsize[x - 1] || m)
 362			break;
 363		sdp->sd_heightsize[x] = space;
 364	}
 365	sdp->sd_max_height = x;
 366	sdp->sd_heightsize[x] = ~0;
 367	gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
 368
 369	sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
 370				 sizeof(struct gfs2_dinode);
 371	sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
 372	for (x = 2;; x++) {
 373		u64 space, d;
 374		u32 m;
 375
 376		space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
 377		d = space;
 378		m = do_div(d, sdp->sd_inptrs);
 379
 380		if (d != sdp->sd_jheightsize[x - 1] || m)
 381			break;
 382		sdp->sd_jheightsize[x] = space;
 383	}
 384	sdp->sd_max_jheight = x;
 385	sdp->sd_jheightsize[x] = ~0;
 386	gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
 387
 388	return 0;
 389}
 390
 391static int init_names(struct gfs2_sbd *sdp, int silent)
 392{
 393	char *proto, *table;
 394	int error = 0;
 395
 396	proto = sdp->sd_args.ar_lockproto;
 397	table = sdp->sd_args.ar_locktable;
 398
 399	/*  Try to autodetect  */
 400
 401	if (!proto[0] || !table[0]) {
 402		error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 403		if (error)
 404			return error;
 405
 406		error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 407		if (error)
 408			goto out;
 409
 410		if (!proto[0])
 411			proto = sdp->sd_sb.sb_lockproto;
 412		if (!table[0])
 413			table = sdp->sd_sb.sb_locktable;
 414	}
 415
 416	if (!table[0])
 417		table = sdp->sd_vfs->s_id;
 418
 419	strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
 420	strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
 421
 422	table = sdp->sd_table_name;
 423	while ((table = strchr(table, '/')))
 424		*table = '_';
 425
 426out:
 427	return error;
 428}
 429
 430static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 431			int undo)
 432{
 433	int error = 0;
 434
 435	if (undo)
 436		goto fail_trans;
 437
 438	error = gfs2_glock_nq_num(sdp,
 439				  GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 440				  LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 441				  mount_gh);
 442	if (error) {
 443		fs_err(sdp, "can't acquire mount glock: %d\n", error);
 444		goto fail;
 445	}
 446
 447	error = gfs2_glock_nq_num(sdp,
 448				  GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 449				  LM_ST_SHARED,
 450				  LM_FLAG_NOEXP | GL_EXACT,
 451				  &sdp->sd_live_gh);
 452	if (error) {
 453		fs_err(sdp, "can't acquire live glock: %d\n", error);
 454		goto fail_mount;
 455	}
 456
 457	error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 458			       CREATE, &sdp->sd_rename_gl);
 459	if (error) {
 460		fs_err(sdp, "can't create rename glock: %d\n", error);
 461		goto fail_live;
 462	}
 463
 464	error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 465			       CREATE, &sdp->sd_trans_gl);
 466	if (error) {
 467		fs_err(sdp, "can't create transaction glock: %d\n", error);
 468		goto fail_rename;
 469	}
 470
 471	return 0;
 472
 473fail_trans:
 474	gfs2_glock_put(sdp->sd_trans_gl);
 475fail_rename:
 476	gfs2_glock_put(sdp->sd_rename_gl);
 477fail_live:
 478	gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 479fail_mount:
 480	gfs2_glock_dq_uninit(mount_gh);
 481fail:
 482	return error;
 483}
 484
 485static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
 486			    u64 no_addr, const char *name)
 487{
 488	struct gfs2_sbd *sdp = sb->s_fs_info;
 489	struct dentry *dentry;
 490	struct inode *inode;
 491
 492	inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
 493	if (IS_ERR(inode)) {
 494		fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
 495		return PTR_ERR(inode);
 496	}
 497	dentry = d_alloc_root(inode);
 498	if (!dentry) {
 499		fs_err(sdp, "can't alloc %s dentry\n", name);
 500		iput(inode);
 501		return -ENOMEM;
 502	}
 503	dentry->d_op = &gfs2_dops;
 504	*dptr = dentry;
 505	return 0;
 506}
 507
 508static int init_sb(struct gfs2_sbd *sdp, int silent)
 509{
 510	struct super_block *sb = sdp->sd_vfs;
 511	struct gfs2_holder sb_gh;
 512	u64 no_addr;
 513	int ret;
 514
 515	ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 516				LM_ST_SHARED, 0, &sb_gh);
 517	if (ret) {
 518		fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
 519		return ret;
 520	}
 521
 522	ret = gfs2_read_sb(sdp, silent);
 523	if (ret) {
 524		fs_err(sdp, "can't read superblock: %d\n", ret);
 525		goto out;
 526	}
 527
 528	/* Set up the buffer cache and SB for real */
 529	if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
 530		ret = -EINVAL;
 531		fs_err(sdp, "FS block size (%u) is too small for device "
 532		       "block size (%u)\n",
 533		       sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
 534		goto out;
 535	}
 536	if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 537		ret = -EINVAL;
 538		fs_err(sdp, "FS block size (%u) is too big for machine "
 539		       "page size (%u)\n",
 540		       sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 541		goto out;
 542	}
 543	sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 544
 545	/* Get the root inode */
 546	no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 547	ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 548	if (ret)
 549		goto out;
 550
 551	/* Get the master inode */
 552	no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 553	ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 554	if (ret) {
 555		dput(sdp->sd_root_dir);
 556		goto out;
 557	}
 558	sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 559out:
 560	gfs2_glock_dq_uninit(&sb_gh);
 561	return ret;
 562}
 563
 564/**
 565 * map_journal_extents - create a reusable "extent" mapping from all logical
 566 * blocks to all physical blocks for the given journal.  This will save
 567 * us time when writing journal blocks.  Most journals will have only one
 568 * extent that maps all their logical blocks.  That's because gfs2.mkfs
 569 * arranges the journal blocks sequentially to maximize performance.
 570 * So the extent would map the first block for the entire file length.
 571 * However, gfs2_jadd can happen while file activity is happening, so
 572 * those journals may not be sequential.  Less likely is the case where
 573 * the users created their own journals by mounting the metafs and
 574 * laying it out.  But it's still possible.  These journals might have
 575 * several extents.
 576 *
 577 * TODO: This should be done in bigger chunks rather than one block at a time,
 578 *       but since it's only done at mount time, I'm not worried about the
 579 *       time it takes.
 580 */
 581static int map_journal_extents(struct gfs2_sbd *sdp)
 582{
 583	struct gfs2_jdesc *jd = sdp->sd_jdesc;
 584	unsigned int lb;
 585	u64 db, prev_db; /* logical block, disk block, prev disk block */
 586	struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 587	struct gfs2_journal_extent *jext = NULL;
 588	struct buffer_head bh;
 589	int rc = 0;
 590
 591	prev_db = 0;
 592
 593	for (lb = 0; lb < ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; lb++) {
 594		bh.b_state = 0;
 595		bh.b_blocknr = 0;
 596		bh.b_size = 1 << ip->i_inode.i_blkbits;
 597		rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
 598		db = bh.b_blocknr;
 599		if (rc || !db) {
 600			printk(KERN_INFO "GFS2 journal mapping error %d: lb="
 601			       "%u db=%llu\n", rc, lb, (unsigned long long)db);
 602			break;
 603		}
 604		if (!prev_db || db != prev_db + 1) {
 605			jext = kzalloc(sizeof(struct gfs2_journal_extent),
 606				       GFP_KERNEL);
 607			if (!jext) {
 608				printk(KERN_INFO "GFS2 error: out of memory "
 609				       "mapping journal extents.\n");
 610				rc = -ENOMEM;
 611				break;
 612			}
 613			jext->dblock = db;
 614			jext->lblock = lb;
 615			jext->blocks = 1;
 616			list_add_tail(&jext->extent_list, &jd->extent_list);
 617		} else {
 618			jext->blocks++;
 619		}
 620		prev_db = db;
 621	}
 622	return rc;
 623}
 624
 625static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
 626{
 627	char *message = "FIRSTMOUNT=Done";
 628	char *envp[] = { message, NULL };
 629	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 630	ls->ls_first_done = 1;
 631	kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
 632}
 633
 634/**
 635 * gfs2_jindex_hold - Grab a lock on the jindex
 636 * @sdp: The GFS2 superblock
 637 * @ji_gh: the holder for the jindex glock
 638 *
 639 * Returns: errno
 640 */
 641
 642static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 643{
 644	struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
 645	struct qstr name;
 646	char buf[20];
 647	struct gfs2_jdesc *jd;
 648	int error;
 649
 650	name.name = buf;
 651
 652	mutex_lock(&sdp->sd_jindex_mutex);
 653
 654	for (;;) {
 655		error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
 656		if (error)
 657			break;
 658
 659		name.len = sprintf(buf, "journal%u", sdp->sd_journals);
 660		name.hash = gfs2_disk_hash(name.name, name.len);
 661
 662		error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
 663		if (error == -ENOENT) {
 664			error = 0;
 665			break;
 666		}
 667
 668		gfs2_glock_dq_uninit(ji_gh);
 669
 670		if (error)
 671			break;
 672
 673		error = -ENOMEM;
 674		jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
 675		if (!jd)
 676			break;
 677
 678		INIT_LIST_HEAD(&jd->extent_list);
 679		jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
 680		if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
 681			if (!jd->jd_inode)
 682				error = -ENOENT;
 683			else
 684				error = PTR_ERR(jd->jd_inode);
 685			kfree(jd);
 686			break;
 687		}
 688
 689		spin_lock(&sdp->sd_jindex_spin);
 690		jd->jd_jid = sdp->sd_journals++;
 691		list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
 692		spin_unlock(&sdp->sd_jindex_spin);
 693	}
 694
 695	mutex_unlock(&sdp->sd_jindex_mutex);
 696
 697	return error;
 698}
 699
 700static int init_journal(struct gfs2_sbd *sdp, int undo)
 701{
 702	struct inode *master = sdp->sd_master_dir->d_inode;
 703	struct gfs2_holder ji_gh;
 704	struct task_struct *p;
 705	struct gfs2_inode *ip;
 706	int jindex = 1;
 707	int error = 0;
 708
 709	if (undo) {
 710		jindex = 0;
 711		goto fail_recoverd;
 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	ip = GFS2_I(sdp->sd_jindex);
 720
 721	/* Load in the journal index special file */
 722
 723	error = gfs2_jindex_hold(sdp, &ji_gh);
 724	if (error) {
 725		fs_err(sdp, "can't read journal index: %d\n", error);
 726		goto fail;
 727	}
 728
 729	error = -EINVAL;
 730	if (!gfs2_jindex_size(sdp)) {
 731		fs_err(sdp, "no journals!\n");
 732		goto fail_jindex;
 733	}
 734
 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	} else {
 739		if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 740			fs_err(sdp, "can't mount journal #%u\n",
 741			       sdp->sd_lockstruct.ls_jid);
 742			fs_err(sdp, "there are only %u journals (0 - %u)\n",
 743			       gfs2_jindex_size(sdp),
 744			       gfs2_jindex_size(sdp) - 1);
 745			goto fail_jindex;
 746		}
 747		sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 748
 749		error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 750					  &gfs2_journal_glops,
 751					  LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 752					  &sdp->sd_journal_gh);
 753		if (error) {
 754			fs_err(sdp, "can't acquire journal glock: %d\n", error);
 755			goto fail_jindex;
 756		}
 757
 758		ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 759		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 760					   LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 761					   &sdp->sd_jinode_gh);
 762		if (error) {
 763			fs_err(sdp, "can't acquire journal inode glock: %d\n",
 764			       error);
 765			goto fail_journal_gh;
 766		}
 767
 768		error = gfs2_jdesc_check(sdp->sd_jdesc);
 769		if (error) {
 770			fs_err(sdp, "my journal (%u) is bad: %d\n",
 771			       sdp->sd_jdesc->jd_jid, error);
 772			goto fail_jinode_gh;
 773		}
 774		atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 775
 776		/* Map the extents for this journal's blocks */
 777		map_journal_extents(sdp);
 778	}
 779
 780	if (sdp->sd_lockstruct.ls_first) {
 781		unsigned int x;
 782		for (x = 0; x < sdp->sd_journals; x++) {
 783			error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 784			if (error) {
 785				fs_err(sdp, "error recovering journal %u: %d\n",
 786				       x, error);
 787				goto fail_jinode_gh;
 788			}
 789		}
 790
 791		gfs2_others_may_mount(sdp);
 792	} else if (!sdp->sd_args.ar_spectator) {
 793		error = gfs2_recover_journal(sdp->sd_jdesc);
 794		if (error) {
 795			fs_err(sdp, "error recovering my journal: %d\n", error);
 796			goto fail_jinode_gh;
 797		}
 798	}
 799
 800	set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 801	gfs2_glock_dq_uninit(&ji_gh);
 802	jindex = 0;
 803
 804	p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
 805	error = IS_ERR(p);
 806	if (error) {
 807		fs_err(sdp, "can't start recoverd thread: %d\n", error);
 808		goto fail_jinode_gh;
 809	}
 810	sdp->sd_recoverd_process = p;
 811
 812	return 0;
 813
 814fail_recoverd:
 815	kthread_stop(sdp->sd_recoverd_process);
 816fail_jinode_gh:
 817	if (!sdp->sd_args.ar_spectator)
 818		gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 819fail_journal_gh:
 820	if (!sdp->sd_args.ar_spectator)
 821		gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 822fail_jindex:
 823	gfs2_jindex_free(sdp);
 824	if (jindex)
 825		gfs2_glock_dq_uninit(&ji_gh);
 826fail:
 827	iput(sdp->sd_jindex);
 828	return error;
 829}
 830
 831
 832static int init_inodes(struct gfs2_sbd *sdp, int undo)
 833{
 834	int error = 0;
 835	struct gfs2_inode *ip;
 836	struct inode *master = sdp->sd_master_dir->d_inode;
 837
 838	if (undo)
 839		goto fail_qinode;
 840
 841	error = init_journal(sdp, undo);
 842	if (error)
 843		goto fail;
 844
 845	/* Read in the master inode number inode */
 846	sdp->sd_inum_inode = gfs2_lookup_simple(master, "inum");
 847	if (IS_ERR(sdp->sd_inum_inode)) {
 848		error = PTR_ERR(sdp->sd_inum_inode);
 849		fs_err(sdp, "can't read in inum inode: %d\n", error);
 850		goto fail_journal;
 851	}
 852
 853
 854	/* Read in the master statfs inode */
 855	sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 856	if (IS_ERR(sdp->sd_statfs_inode)) {
 857		error = PTR_ERR(sdp->sd_statfs_inode);
 858		fs_err(sdp, "can't read in statfs inode: %d\n", error);
 859		goto fail_inum;
 860	}
 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_statfs;
 868	}
 869	ip = GFS2_I(sdp->sd_rindex);
 870	sdp->sd_rindex_uptodate = 0;
 871
 872	/* Read in the quota inode */
 873	sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 874	if (IS_ERR(sdp->sd_quota_inode)) {
 875		error = PTR_ERR(sdp->sd_quota_inode);
 876		fs_err(sdp, "can't get quota file inode: %d\n", error);
 877		goto fail_rindex;
 878	}
 879	return 0;
 880
 881fail_qinode:
 882	iput(sdp->sd_quota_inode);
 883fail_rindex:
 884	gfs2_clear_rgrpd(sdp);
 885	iput(sdp->sd_rindex);
 886fail_statfs:
 887	iput(sdp->sd_statfs_inode);
 888fail_inum:
 889	iput(sdp->sd_inum_inode);
 890fail_journal:
 891	init_journal(sdp, UNDO);
 892fail:
 893	return error;
 894}
 895
 896static int init_per_node(struct gfs2_sbd *sdp, int undo)
 897{
 898	struct inode *pn = NULL;
 899	char buf[30];
 900	int error = 0;
 901	struct gfs2_inode *ip;
 902	struct inode *master = sdp->sd_master_dir->d_inode;
 903
 904	if (sdp->sd_args.ar_spectator)
 905		return 0;
 906
 907	if (undo)
 908		goto fail_qc_gh;
 909
 910	pn = gfs2_lookup_simple(master, "per_node");
 911	if (IS_ERR(pn)) {
 912		error = PTR_ERR(pn);
 913		fs_err(sdp, "can't find per_node directory: %d\n", error);
 914		return error;
 915	}
 916
 917	sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
 918	sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
 919	if (IS_ERR(sdp->sd_ir_inode)) {
 920		error = PTR_ERR(sdp->sd_ir_inode);
 921		fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
 922		goto fail;
 923	}
 924
 925	sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 926	sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 927	if (IS_ERR(sdp->sd_sc_inode)) {
 928		error = PTR_ERR(sdp->sd_sc_inode);
 929		fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 930		goto fail_ir_i;
 931	}
 932
 933	sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 934	sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 935	if (IS_ERR(sdp->sd_qc_inode)) {
 936		error = PTR_ERR(sdp->sd_qc_inode);
 937		fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 938		goto fail_ut_i;
 939	}
 940
 941	iput(pn);
 942	pn = NULL;
 943
 944	ip = GFS2_I(sdp->sd_ir_inode);
 945	error = gfs2_glock_nq_init(ip->i_gl,
 946				   LM_ST_EXCLUSIVE, 0,
 947				   &sdp->sd_ir_gh);
 948	if (error) {
 949		fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
 950		goto fail_qc_i;
 951	}
 952
 953	ip = GFS2_I(sdp->sd_sc_inode);
 954	error = gfs2_glock_nq_init(ip->i_gl,
 955				   LM_ST_EXCLUSIVE, 0,
 956				   &sdp->sd_sc_gh);
 957	if (error) {
 958		fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 959		goto fail_ir_gh;
 960	}
 961
 962	ip = GFS2_I(sdp->sd_qc_inode);
 963	error = gfs2_glock_nq_init(ip->i_gl,
 964				   LM_ST_EXCLUSIVE, 0,
 965				   &sdp->sd_qc_gh);
 966	if (error) {
 967		fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 968		goto fail_ut_gh;
 969	}
 970
 971	return 0;
 972
 973fail_qc_gh:
 974	gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 975fail_ut_gh:
 976	gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 977fail_ir_gh:
 978	gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 979fail_qc_i:
 980	iput(sdp->sd_qc_inode);
 981fail_ut_i:
 982	iput(sdp->sd_sc_inode);
 983fail_ir_i:
 984	iput(sdp->sd_ir_inode);
 985fail:
 986	if (pn)
 987		iput(pn);
 988	return error;
 989}
 990
 991static int init_threads(struct gfs2_sbd *sdp, int undo)
 992{
 993	struct task_struct *p;
 994	int error = 0;
 995
 996	if (undo)
 997		goto fail_quotad;
 998
 999	sdp->sd_log_flush_time = jiffies;
1000
1001	p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
1002	error = IS_ERR(p);
1003	if (error) {
1004		fs_err(sdp, "can't start logd thread: %d\n", error);
1005		return error;
1006	}
1007	sdp->sd_logd_process = p;
1008
1009	p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
1010	error = IS_ERR(p);
1011	if (error) {
1012		fs_err(sdp, "can't start quotad thread: %d\n", error);
1013		goto fail;
1014	}
1015	sdp->sd_quotad_process = p;
1016
1017	return 0;
1018
1019
1020fail_quotad:
1021	kthread_stop(sdp->sd_quotad_process);
1022fail:
1023	kthread_stop(sdp->sd_logd_process);
1024	return error;
1025}
1026
1027static const match_table_t nolock_tokens = {
1028	{ Opt_jid, "jid=%d\n", },
1029	{ Opt_err, NULL },
1030};
1031
1032static const struct lm_lockops nolock_ops = {
1033	.lm_proto_name = "lock_nolock",
1034	.lm_put_lock = kmem_cache_free,
1035	.lm_tokens = &nolock_tokens,
1036};
1037
1038/**
1039 * gfs2_lm_mount - mount a locking protocol
1040 * @sdp: the filesystem
1041 * @args: mount arguements
1042 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
1043 *
1044 * Returns: errno
1045 */
1046
1047static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1048{
1049	const struct lm_lockops *lm;
1050	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1051	struct gfs2_args *args = &sdp->sd_args;
1052	const char *proto = sdp->sd_proto_name;
1053	const char *table = sdp->sd_table_name;
1054	const char *fsname;
1055	char *o, *options;
1056	int ret;
1057
1058	if (!strcmp("lock_nolock", proto)) {
1059		lm = &nolock_ops;
1060		sdp->sd_args.ar_localflocks = 1;
1061		sdp->sd_args.ar_localcaching = 1;
1062#ifdef CONFIG_GFS2_FS_LOCKING_DLM
1063	} else if (!strcmp("lock_dlm", proto)) {
1064		lm = &gfs2_dlm_ops;
1065#endif
1066	} else {
1067		printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
1068		return -ENOENT;
1069	}
1070
1071	fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1072
1073	ls->ls_ops = lm;
1074	ls->ls_first = 1;
1075	ls->ls_id = 0;
1076
1077	for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1078		substring_t tmp[MAX_OPT_ARGS];
1079		int token, option;
1080
1081		if (!o || !*o)
1082			continue;
1083
1084		token = match_token(o, *lm->lm_tokens, tmp);
1085		switch (token) {
1086		case Opt_jid:
1087			ret = match_int(&tmp[0], &option);
1088			if (ret || option < 0) 
1089				goto hostdata_error;
1090			ls->ls_jid = option;
1091			break;
1092		case Opt_id:
1093			ret = match_int(&tmp[0], &option);
1094			if (ret)
1095				goto hostdata_error;
1096			ls->ls_id = option;
1097			break;
1098		case Opt_first:
1099			ret = match_int(&tmp[0], &option);
1100			if (ret || (option != 0 && option != 1))
1101				goto hostdata_error;
1102			ls->ls_first = option;
1103			break;
1104		case Opt_nodir:
1105			ret = match_int(&tmp[0], &option);
1106			if (ret || (option != 0 && option != 1))
1107				goto hostdata_error;
1108			ls->ls_nodir = option;
1109			break;
1110		case Opt_err:
1111		default:
1112hostdata_error:
1113			fs_info(sdp, "unknown hostdata (%s)\n", o);
1114			return -EINVAL;
1115		}
1116	}
1117
1118	if (sdp->sd_args.ar_spectator)
1119		snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
1120	else
1121		snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
1122			 sdp->sd_lockstruct.ls_jid);
1123
1124	fsname = strchr(table, ':');
1125	if (fsname)
1126		fsname++;
1127	if (lm->lm_mount == NULL) {
1128		fs_info(sdp, "Now mounting FS...\n");
1129		return 0;
1130	}
1131	ret = lm->lm_mount(sdp, fsname);
1132	if (ret == 0)
1133		fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1134	return ret;
1135}
1136
1137void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1138{
1139	const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1140	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1141	    lm->lm_unmount)
1142		lm->lm_unmount(sdp);
1143}
1144
1145/**
1146 * fill_super - Read in superblock
1147 * @sb: The VFS superblock
1148 * @data: Mount options
1149 * @silent: Don't complain if it's not a GFS2 filesystem
1150 *
1151 * Returns: errno
1152 */
1153
1154static int fill_super(struct super_block *sb, void *data, int silent)
1155{
1156	struct gfs2_sbd *sdp;
1157	struct gfs2_holder mount_gh;
1158	int error;
1159
1160	sdp = init_sbd(sb);
1161	if (!sdp) {
1162		printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1163		return -ENOMEM;
1164	}
1165
1166	sdp->sd_args.ar_quota = GFS2_QUOTA_DEFAULT;
1167	sdp->sd_args.ar_data = GFS2_DATA_DEFAULT;
1168
1169	error = gfs2_mount_args(sdp, &sdp->sd_args, data);
1170	if (error) {
1171		printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1172		goto fail;
1173	}
1174
1175	if (sdp->sd_args.ar_spectator)
1176                sb->s_flags |= MS_RDONLY;
1177	if (sdp->sd_args.ar_posix_acl)
1178		sb->s_flags |= MS_POSIXACL;
1179
1180	sb->s_magic = GFS2_MAGIC;
1181	sb->s_op = &gfs2_super_ops;
1182	sb->s_export_op = &gfs2_export_ops;
1183	sb->s_time_gran = 1;
1184	sb->s_maxbytes = MAX_LFS_FILESIZE;
1185
1186	/* Set up the buffer cache and fill in some fake block size values
1187	   to allow us to read-in the on-disk superblock. */
1188	sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1189	sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1190	sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1191                               GFS2_BASIC_BLOCK_SHIFT;
1192	sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1193
1194	error = init_names(sdp, silent);
1195	if (error)
1196		goto fail;
1197
1198	gfs2_create_debugfs_file(sdp);
1199
1200	error = gfs2_sys_fs_add(sdp);
1201	if (error)
1202		goto fail;
1203
1204	error = gfs2_lm_mount(sdp, silent);
1205	if (error)
1206		goto fail_sys;
1207
1208	error = init_locking(sdp, &mount_gh, DO);
1209	if (error)
1210		goto fail_lm;
1211
1212	error = init_sb(sdp, silent);
1213	if (error)
1214		goto fail_locking;
1215
1216	error = init_inodes(sdp, DO);
1217	if (error)
1218		goto fail_sb;
1219
1220	error = init_per_node(sdp, DO);
1221	if (error)
1222		goto fail_inodes;
1223
1224	error = gfs2_statfs_init(sdp);
1225	if (error) {
1226		fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1227		goto fail_per_node;
1228	}
1229
1230	error = init_threads(sdp, DO);
1231	if (error)
1232		goto fail_per_node;
1233
1234	if (!(sb->s_flags & MS_RDONLY)) {
1235		error = gfs2_make_fs_rw(sdp);
1236		if (error) {
1237			fs_err(sdp, "can't make FS RW: %d\n", error);
1238			goto fail_threads;
1239		}
1240	}
1241
1242	gfs2_glock_dq_uninit(&mount_gh);
1243
1244	return 0;
1245
1246fail_threads:
1247	init_threads(sdp, UNDO);
1248fail_per_node:
1249	init_per_node(sdp, UNDO);
1250fail_inodes:
1251	init_inodes(sdp, UNDO);
1252fail_sb:
1253	if (sdp->sd_root_dir)
1254		dput(sdp->sd_root_dir);
1255	if (sdp->sd_master_dir)
1256		dput(sdp->sd_master_dir);
1257	if (sb->s_root)
1258		dput(sb->s_root);
1259	sb->s_root = NULL;
1260fail_locking:
1261	init_locking(sdp, &mount_gh, UNDO);
1262fail_lm:
1263	gfs2_gl_hash_clear(sdp);
1264	gfs2_lm_unmount(sdp);
1265	while (invalidate_inodes(sb))
1266		yield();
1267fail_sys:
1268	gfs2_sys_fs_del(sdp);
1269fail:
1270	gfs2_delete_debugfs_file(sdp);
1271	kfree(sdp);
1272	sb->s_fs_info = NULL;
1273	return error;
1274}
1275
1276static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
1277		       const char *dev_name, void *data, struct vfsmount *mnt)
1278{
1279	return get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
1280}
1281
1282static struct super_block *get_gfs2_sb(const char *dev_name)
1283{
1284	struct super_block *sb;
1285	struct nameidata nd;
1286	int error;
1287
1288	error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
1289	if (error) {
1290		printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1291		       dev_name, error);
1292		return NULL;
1293	}
1294	sb = nd.path.dentry->d_inode->i_sb;
1295	if (sb && (sb->s_type == &gfs2_fs_type))
1296		atomic_inc(&sb->s_active);
1297	else
1298		sb = NULL;
1299	path_put(&nd.path);
1300	return sb;
1301}
1302
1303static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
1304			    const char *dev_name, void *data, struct vfsmount *mnt)
1305{
1306	struct super_block *sb = NULL;
1307	struct gfs2_sbd *sdp;
1308
1309	sb = get_gfs2_sb(dev_name);
1310	if (!sb) {
1311		printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1312		return -ENOENT;
1313	}
1314	sdp = sb->s_fs_info;
1315	mnt->mnt_sb = sb;
1316	mnt->mnt_root = dget(sdp->sd_master_dir);
1317	return 0;
1318}
1319
1320static void gfs2_kill_sb(struct super_block *sb)
1321{
1322	struct gfs2_sbd *sdp = sb->s_fs_info;
1323
1324	if (sdp == NULL) {
1325		kill_block_super(sb);
1326		return;
1327	}
1328
1329	gfs2_meta_syncfs(sdp);
1330	dput(sdp->sd_root_dir);
1331	dput(sdp->sd_master_dir);
1332	sdp->sd_root_dir = NULL;
1333	sdp->sd_master_dir = NULL;
1334	shrink_dcache_sb(sb);
1335	kill_block_super(sb);
1336	gfs2_delete_debugfs_file(sdp);
1337	kfree(sdp);
1338}
1339
1340struct file_system_type gfs2_fs_type = {
1341	.name = "gfs2",
1342	.fs_flags = FS_REQUIRES_DEV,
1343	.get_sb = gfs2_get_sb,
1344	.kill_sb = gfs2_kill_sb,
1345	.owner = THIS_MODULE,
1346};
1347
1348struct file_system_type gfs2meta_fs_type = {
1349	.name = "gfs2meta",
1350	.fs_flags = FS_REQUIRES_DEV,
1351	.get_sb = gfs2_get_sb_meta,
1352	.owner = THIS_MODULE,
1353};
1354