Commit message: ext4: Add sanity checks for the superblock before mounting the filesystem

This avoids insane superblock configurations that could lead to kernel
oops due to null pointer derefences.

http://bugzilla.kernel.org/show_bug.cgi?id=12371

Thanks to David Maciejak at Fortinet's FortiGuard Global Security
Research Team who discovered this bug independently (but at
approximately the same time) as Thiemo Nagel, who submitted the patch.

Signed-off-by: Thiemo Nagel <thiemo.nagel@ph.tum.de>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
CVE: CVE-2009-0748
CWE: CWE-20
Vulnerability description: The ext4_fill_super function in fs/ext4/super.c in the Linux kernel 2.6.27 before 2.6.27.19 and 2.6.28 before 2.6.28.7 does not validate the superblock configuration, which allows local users to cause a denial of service (NULL pointer dereference and OOPS) by attempting to mount a crafted ext4 filesystem.

Project: linux-2.6

static inline void ext4_show_quota_options(struct seq_file *seq,
					   struct super_block *sb)
{
#if defined(CONFIG_QUOTA)
	struct ext4_sb_info *sbi = EXT4_SB(sb);

	if (sbi->s_jquota_fmt)
		seq_printf(seq, ",jqfmt=%s",
		(sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");

	if (sbi->s_qf_names[USRQUOTA])
		seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);

	if (sbi->s_qf_names[GRPQUOTA])
		seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);

	if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
		seq_puts(seq, ",usrquota");

	if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
		seq_puts(seq, ",grpquota");
#endif
}

Project: linux-2.6

static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
{
	struct list_head *l;

	printk(KERN_ERR "sb orphan head is %d\n",
	       le32_to_cpu(sbi->s_es->s_last_orphan));

	printk(KERN_ERR "sb_info orphan list:\n");
	list_for_each(l, &sbi->s_orphan) {
		struct inode *inode = orphan_list_entry(l);
		printk(KERN_ERR "  "
		       "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
		       inode->i_sb->s_id, inode->i_ino, inode,
		       inode->i_mode, inode->i_nlink,
		       NEXT_ORPHAN(inode));
	}
}

Project: linux-2.6

int ext4_force_commit(struct super_block *sb)
{
	journal_t *journal;
	int ret = 0;

	if (sb->s_flags & MS_RDONLY)
		return 0;

	journal = EXT4_SB(sb)->s_journal;
	if (journal) {
		sb->s_dirt = 0;
		ret = ext4_journal_force_commit(journal);
	}

	return ret;
}

Project: linux-2.6

static void ext4_handle_error(struct super_block *sb)
{
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

	EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
	es->s_state |= cpu_to_le16(EXT4_ERROR_FS);

	if (sb->s_flags & MS_RDONLY)
		return;

	if (!test_opt(sb, ERRORS_CONT)) {
		journal_t *journal = EXT4_SB(sb)->s_journal;

		EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
		if (journal)
			jbd2_journal_abort(journal, -EIO);
	}
	if (test_opt(sb, ERRORS_RO)) {
		printk(KERN_CRIT "Remounting filesystem read-only\n");
		sb->s_flags |= MS_RDONLY;
	}
	ext4_commit_super(sb, es, 1);
	if (test_opt(sb, ERRORS_PANIC))
		panic("EXT4-fs (device %s): panic forced after error\n",
			sb->s_id);
}

Project: linux-2.6

static int ext4_dquot_initialize(struct inode *inode, int type)
{
	handle_t *handle;
	int ret, err;

	/* We may create quota structure so we need to reserve enough blocks */
	handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_initialize(inode, type);
	err = ext4_journal_stop(handle);
	if (!ret)
		ret = err;
	return ret;
}

Project: linux-2.6

static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
{
	int def_errors;
	unsigned long def_mount_opts;
	struct super_block *sb = vfs->mnt_sb;
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;

	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
	def_errors     = le16_to_cpu(es->s_errors);

	if (sbi->s_sb_block != 1)
		seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
	if (test_opt(sb, MINIX_DF))
		seq_puts(seq, ",minixdf");
	if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
		seq_puts(seq, ",grpid");
	if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
		seq_puts(seq, ",nogrpid");
	if (sbi->s_resuid != EXT4_DEF_RESUID ||
	    le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
		seq_printf(seq, ",resuid=%u", sbi->s_resuid);
	}
	if (sbi->s_resgid != EXT4_DEF_RESGID ||
	    le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
		seq_printf(seq, ",resgid=%u", sbi->s_resgid);
	}
	if (test_opt(sb, ERRORS_RO)) {
		if (def_errors == EXT4_ERRORS_PANIC ||
		    def_errors == EXT4_ERRORS_CONTINUE) {
			seq_puts(seq, ",errors=remount-ro");
		}
	}
	if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
		seq_puts(seq, ",errors=continue");
	if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
		seq_puts(seq, ",errors=panic");
	if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
		seq_puts(seq, ",nouid32");
	if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
		seq_puts(seq, ",debug");
	if (test_opt(sb, OLDALLOC))
		seq_puts(seq, ",oldalloc");
#ifdef CONFIG_EXT4_FS_XATTR
	if (test_opt(sb, XATTR_USER) &&
		!(def_mount_opts & EXT4_DEFM_XATTR_USER))
		seq_puts(seq, ",user_xattr");
	if (!test_opt(sb, XATTR_USER) &&
	    (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
		seq_puts(seq, ",nouser_xattr");
	}
#endif
#ifdef CONFIG_EXT4_FS_POSIX_ACL
	if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
		seq_puts(seq, ",acl");
	if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
		seq_puts(seq, ",noacl");
#endif
	if (!test_opt(sb, RESERVATION))
		seq_puts(seq, ",noreservation");
	if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
		seq_printf(seq, ",commit=%u",
			   (unsigned) (sbi->s_commit_interval / HZ));
	}
	if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
		seq_printf(seq, ",min_batch_time=%u",
			   (unsigned) sbi->s_min_batch_time);
	}
	if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
		seq_printf(seq, ",max_batch_time=%u",
			   (unsigned) sbi->s_min_batch_time);
	}

	/*
	 * We're changing the default of barrier mount option, so
	 * let's always display its mount state so it's clear what its
	 * status is.
	 */
	seq_puts(seq, ",barrier=");
	seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
	if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
		seq_puts(seq, ",journal_async_commit");
	if (test_opt(sb, NOBH))
		seq_puts(seq, ",nobh");
	if (!test_opt(sb, EXTENTS))
		seq_puts(seq, ",noextents");
	if (test_opt(sb, I_VERSION))
		seq_puts(seq, ",i_version");
	if (!test_opt(sb, DELALLOC))
		seq_puts(seq, ",nodelalloc");


	if (sbi->s_stripe)
		seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
	/*
	 * journal mode get enabled in different ways
	 * So just print the value even if we didn't specify it
	 */
	if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
		seq_puts(seq, ",data=journal");
	else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
		seq_puts(seq, ",data=ordered");
	else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
		seq_puts(seq, ",data=writeback");

	if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
		seq_printf(seq, ",inode_readahead_blks=%u",
			   sbi->s_inode_readahead_blks);

	if (test_opt(sb, DATA_ERR_ABORT))
		seq_puts(seq, ",data_err=abort");

	ext4_show_quota_options(seq, sb);
	return 0;
}

Project: linux-2.6

static int ext4_sync_fs(struct super_block *sb, int wait)
{
	int ret = 0;

	trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait);
	sb->s_dirt = 0;
	if (EXT4_SB(sb)->s_journal) {
		if (wait)
			ret = ext4_force_commit(sb);
		else
 			jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, NULL);
	} else {
		ext4_commit_super(sb, EXT4_SB(sb)->s_es, wait);
	}
	return ret;
}

Project: linux-2.6

static void ext4_write_super(struct super_block *sb)
{
	if (EXT4_SB(sb)->s_journal) {
		if (mutex_trylock(&sb->s_lock) != 0)
			BUG();
		sb->s_dirt = 0;
	} else {
		ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
	}
}

Project: linux-2.6

static int ext4dev_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
	printk(KERN_WARNING "EXT4-fs: Update your userspace programs "
	       "to mount using ext4\n");
	printk(KERN_WARNING "EXT4-fs: ext4dev backwards compatibility "
	       "will go away by 2.6.31\n");
	return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
}

Project: linux-2.6

				__acquires(kernel_lock)

{
	struct buffer_head *bh;
	struct ext4_super_block *es = NULL;
	struct ext4_sb_info *sbi;
	ext4_fsblk_t block;
	ext4_fsblk_t sb_block = get_sb_block(&data);
	ext4_fsblk_t logical_sb_block;
	unsigned long offset = 0;
	unsigned long journal_devnum = 0;
	unsigned long def_mount_opts;
	struct inode *root;
	char *cp;
	const char *descr;
	int ret = -EINVAL;
	int blocksize;
	unsigned int db_count;
	unsigned int i;
	int needs_recovery, has_huge_files;
	int features;
	__u64 blocks_count;
	int err;
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;
	sb->s_fs_info = sbi;
	sbi->s_mount_opt = 0;
	sbi->s_resuid = EXT4_DEF_RESUID;
	sbi->s_resgid = EXT4_DEF_RESGID;
	sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
	sbi->s_sb_block = sb_block;

	unlock_kernel();

	/* Cleanup superblock name */
	for (cp = sb->s_id; (cp = strchr(cp, '/'));)
		*cp = '!';

	blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
	if (!blocksize) {
		printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
		goto out_fail;
	}

	/*
	 * The ext4 superblock will not be buffer aligned for other than 1kB
	 * block sizes.  We need to calculate the offset from buffer start.
	 */
	if (blocksize != EXT4_MIN_BLOCK_SIZE) {
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
	} else {
		logical_sb_block = sb_block;
	}

	if (!(bh = sb_bread(sb, logical_sb_block))) {
		printk(KERN_ERR "EXT4-fs: unable to read superblock\n");
		goto out_fail;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
	 *       some ext4 macro-instructions depend on its value
	 */
	es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);
	if (sb->s_magic != EXT4_SUPER_MAGIC)
		goto cantfind_ext4;

	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
	if (def_mount_opts & EXT4_DEFM_DEBUG)
		set_opt(sbi->s_mount_opt, DEBUG);
	if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
		set_opt(sbi->s_mount_opt, GRPID);
	if (def_mount_opts & EXT4_DEFM_UID16)
		set_opt(sbi->s_mount_opt, NO_UID32);
#ifdef CONFIG_EXT4_FS_XATTR
	if (def_mount_opts & EXT4_DEFM_XATTR_USER)
		set_opt(sbi->s_mount_opt, XATTR_USER);
#endif
#ifdef CONFIG_EXT4_FS_POSIX_ACL
	if (def_mount_opts & EXT4_DEFM_ACL)
		set_opt(sbi->s_mount_opt, POSIX_ACL);
#endif
	if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
		sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
		sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
		sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;

	if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
		set_opt(sbi->s_mount_opt, ERRORS_PANIC);
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
		set_opt(sbi->s_mount_opt, ERRORS_CONT);
	else
		set_opt(sbi->s_mount_opt, ERRORS_RO);

	sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
	sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
	sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
	sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
	sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;

	set_opt(sbi->s_mount_opt, RESERVATION);
	set_opt(sbi->s_mount_opt, BARRIER);

	/*
	 * turn on extents feature by default in ext4 filesystem
	 * only if feature flag already set by mkfs or tune2fs.
	 * Use -o noextents to turn it off
	 */
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
		set_opt(sbi->s_mount_opt, EXTENTS);
	else
		ext4_warning(sb, __func__,
			"extents feature not enabled on this filesystem, "
			"use tune2fs.");

	/*
	 * enable delayed allocation by default
	 * Use -o nodelalloc to turn it off
	 */
	set_opt(sbi->s_mount_opt, DELALLOC);


	if (!parse_options((char *) data, sb, &journal_devnum,
			   &journal_ioprio, NULL, 0))
		goto failed_mount;

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
		((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);

	if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
	    (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
	     EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
	     EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
		printk(KERN_WARNING
		       "EXT4-fs warning: feature flags set on rev 0 fs, "
		       "running e2fsck is recommended\n");

	/*
	 * Check feature flags regardless of the revision level, since we
	 * previously didn't change the revision level when setting the flags,
	 * so there is a chance incompat flags are set on a rev 0 filesystem.
	 */
	features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
	if (features) {
		printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
		       "unsupported optional features (%x).\n", sb->s_id,
			(le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
			~EXT4_FEATURE_INCOMPAT_SUPP));
		goto failed_mount;
	}
	features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
	if (!(sb->s_flags & MS_RDONLY) && features) {
		printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
		       "unsupported optional features (%x).\n", sb->s_id,
			(le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
			~EXT4_FEATURE_RO_COMPAT_SUPP));
		goto failed_mount;
	}
	has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
				    EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
	if (has_huge_files) {
		/*
		 * Large file size enabled file system can only be
		 * mount if kernel is build with CONFIG_LBD
		 */
		if (sizeof(root->i_blocks) < sizeof(u64) &&
				!(sb->s_flags & MS_RDONLY)) {
			printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
					"files cannot be mounted read-write "
					"without CONFIG_LBD.\n", sb->s_id);
			goto failed_mount;
		}
	}
	blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);

	if (blocksize < EXT4_MIN_BLOCK_SIZE ||
	    blocksize > EXT4_MAX_BLOCK_SIZE) {
		printk(KERN_ERR
		       "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
		       blocksize, sb->s_id);
		goto failed_mount;
	}

	if (sb->s_blocksize != blocksize) {

		/* Validate the filesystem blocksize */
		if (!sb_set_blocksize(sb, blocksize)) {
			printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
					blocksize);
			goto failed_mount;
		}

		brelse(bh);
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
		bh = sb_bread(sb, logical_sb_block);
		if (!bh) {
			printk(KERN_ERR
			       "EXT4-fs: Can't read superblock on 2nd try.\n");
			goto failed_mount;
		}
		es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
		sbi->s_es = es;
		if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
			printk(KERN_ERR
			       "EXT4-fs: Magic mismatch, very weird !\n");
			goto failed_mount;
		}
	}

	sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
						      has_huge_files);
	sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);

	if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
		sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
		sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
		if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
		    (!is_power_of_2(sbi->s_inode_size)) ||
		    (sbi->s_inode_size > blocksize)) {
			printk(KERN_ERR
			       "EXT4-fs: unsupported inode size: %d\n",
			       sbi->s_inode_size);
			goto failed_mount;
		}
		if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
			sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
	}
	sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
		    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
		    !is_power_of_2(sbi->s_desc_size)) {
			printk(KERN_ERR
			       "EXT4-fs: unsupported descriptor size %lu\n",
			       sbi->s_desc_size);
			goto failed_mount;
		}
	} else
		sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
	sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
	sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
	if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
		goto cantfind_ext4;
	sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
	if (sbi->s_inodes_per_block == 0)
		goto cantfind_ext4;
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
	sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
	sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
	for (i = 0; i < 4; i++)
		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
	sbi->s_def_hash_version = es->s_def_hash_version;
	i = le32_to_cpu(es->s_flags);
	if (i & EXT2_FLAGS_UNSIGNED_HASH)
		sbi->s_hash_unsigned = 3;
	else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
#ifdef __CHAR_UNSIGNED__
		es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
		sbi->s_hash_unsigned = 3;
#else
		es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
#endif
		sb->s_dirt = 1;
	}

	if (sbi->s_blocks_per_group > blocksize * 8) {
		printk(KERN_ERR
		       "EXT4-fs: #blocks per group too big: %lu\n",
		       sbi->s_blocks_per_group);
		goto failed_mount;
	}
	if (sbi->s_inodes_per_group > blocksize * 8) {
		printk(KERN_ERR
		       "EXT4-fs: #inodes per group too big: %lu\n",
		       sbi->s_inodes_per_group);
		goto failed_mount;
	}

	if (ext4_blocks_count(es) >
		    (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
		printk(KERN_ERR "EXT4-fs: filesystem on %s:"
			" too large to mount safely\n", sb->s_id);
		if (sizeof(sector_t) < 8)
			printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
					"enabled\n");
		goto failed_mount;
	}

	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext4;

        /*
         * It makes no sense for the first data block to be beyond the end
         * of the filesystem.
         */
        if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
                printk(KERN_WARNING "EXT4-fs: bad geometry: first data"
		       "block %u is beyond end of filesystem (%llu)\n",
		       le32_to_cpu(es->s_first_data_block),
		       ext4_blocks_count(es));
		goto failed_mount;
	}
	blocks_count = (ext4_blocks_count(es) -
			le32_to_cpu(es->s_first_data_block) +
			EXT4_BLOCKS_PER_GROUP(sb) - 1);
	do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
	if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
		printk(KERN_WARNING "EXT4-fs: groups count too large: %u "
		       "(block count %llu, first data block %u, "
		       "blocks per group %lu)\n", sbi->s_groups_count,
		       ext4_blocks_count(es),
		       le32_to_cpu(es->s_first_data_block),
		       EXT4_BLOCKS_PER_GROUP(sb));
		goto failed_mount;
	}
	sbi->s_groups_count = blocks_count;
	db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
		   EXT4_DESC_PER_BLOCK(sb);
	sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
				    GFP_KERNEL);
	if (sbi->s_group_desc == NULL) {
		printk(KERN_ERR "EXT4-fs: not enough memory\n");
		goto failed_mount;
	}

#ifdef CONFIG_PROC_FS
	if (ext4_proc_root)
		sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);

	if (sbi->s_proc)
		proc_create_data("inode_readahead_blks", 0644, sbi->s_proc,
				 &ext4_ui_proc_fops,
				 &sbi->s_inode_readahead_blks);
#endif

	bgl_lock_init(&sbi->s_blockgroup_lock);

	for (i = 0; i < db_count; i++) {
		block = descriptor_loc(sb, logical_sb_block, i);
		sbi->s_group_desc[i] = sb_bread(sb, block);
		if (!sbi->s_group_desc[i]) {
			printk(KERN_ERR "EXT4-fs: "
			       "can't read group descriptor %d\n", i);
			db_count = i;
			goto failed_mount2;
		}
	}
	if (!ext4_check_descriptors(sb)) {
		printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
		goto failed_mount2;
	}
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
		if (!ext4_fill_flex_info(sb)) {
			printk(KERN_ERR
			       "EXT4-fs: unable to initialize "
			       "flex_bg meta info!\n");
			goto failed_mount2;
		}

	sbi->s_gdb_count = db_count;
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

	err = percpu_counter_init(&sbi->s_freeblocks_counter,
			ext4_count_free_blocks(sb));
	if (!err) {
		err = percpu_counter_init(&sbi->s_freeinodes_counter,
				ext4_count_free_inodes(sb));
	}
	if (!err) {
		err = percpu_counter_init(&sbi->s_dirs_counter,
				ext4_count_dirs(sb));
	}
	if (!err) {
		err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
	}
	if (err) {
		printk(KERN_ERR "EXT4-fs: insufficient memory\n");
		goto failed_mount3;
	}

	sbi->s_stripe = ext4_get_stripe_size(sbi);

	/*
	 * set up enough so that it can read an inode
	 */
	sb->s_op = &ext4_sops;
	sb->s_export_op = &ext4_export_ops;
	sb->s_xattr = ext4_xattr_handlers;
#ifdef CONFIG_QUOTA
	sb->s_qcop = &ext4_qctl_operations;
	sb->dq_op = &ext4_quota_operations;
#endif
	INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */

	sb->s_root = NULL;

	needs_recovery = (es->s_last_orphan != 0 ||
			  EXT4_HAS_INCOMPAT_FEATURE(sb,
				    EXT4_FEATURE_INCOMPAT_RECOVER));

	/*
	 * The first inode we look at is the journal inode.  Don't try
	 * root first: it may be modified in the journal!
	 */
	if (!test_opt(sb, NOLOAD) &&
	    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
		if (ext4_load_journal(sb, es, journal_devnum))
			goto failed_mount3;
		if (!(sb->s_flags & MS_RDONLY) &&
		    EXT4_SB(sb)->s_journal->j_failed_commit) {
			printk(KERN_CRIT "EXT4-fs error (device %s): "
			       "ext4_fill_super: Journal transaction "
			       "%u is corrupt\n", sb->s_id,
			       EXT4_SB(sb)->s_journal->j_failed_commit);
			if (test_opt(sb, ERRORS_RO)) {
				printk(KERN_CRIT
				       "Mounting filesystem read-only\n");
				sb->s_flags |= MS_RDONLY;
				EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
				es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
			}
			if (test_opt(sb, ERRORS_PANIC)) {
				EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
				es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
				ext4_commit_super(sb, es, 1);
				goto failed_mount4;
			}
		}
	} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
	      EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
		printk(KERN_ERR "EXT4-fs: required journal recovery "
		       "suppressed and not mounted read-only\n");
		goto failed_mount4;
	} else {
		clear_opt(sbi->s_mount_opt, DATA_FLAGS);
		set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
		sbi->s_journal = NULL;
		needs_recovery = 0;
		goto no_journal;
	}

	if (ext4_blocks_count(es) > 0xffffffffULL &&
	    !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
				       JBD2_FEATURE_INCOMPAT_64BIT)) {
		printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
		goto failed_mount4;
	}

	if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
		jbd2_journal_set_features(sbi->s_journal,
				JBD2_FEATURE_COMPAT_CHECKSUM, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
	} else if (test_opt(sb, JOURNAL_CHECKSUM)) {
		jbd2_journal_set_features(sbi->s_journal,
				JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
	} else {
		jbd2_journal_clear_features(sbi->s_journal,
				JBD2_FEATURE_COMPAT_CHECKSUM, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
	}

	/* We have now updated the journal if required, so we can
	 * validate the data journaling mode. */
	switch (test_opt(sb, DATA_FLAGS)) {
	case 0:
		/* No mode set, assume a default based on the journal
		 * capabilities: ORDERED_DATA if the journal can
		 * cope, else JOURNAL_DATA
		 */
		if (jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
			set_opt(sbi->s_mount_opt, ORDERED_DATA);
		else
			set_opt(sbi->s_mount_opt, JOURNAL_DATA);
		break;

	case EXT4_MOUNT_ORDERED_DATA:
	case EXT4_MOUNT_WRITEBACK_DATA:
		if (!jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
			printk(KERN_ERR "EXT4-fs: Journal does not support "
			       "requested data journaling mode\n");
			goto failed_mount4;
		}
	default:
		break;
	}
	set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);

no_journal:

	if (test_opt(sb, NOBH)) {
		if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
			printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
				"its supported only with writeback mode\n");
			clear_opt(sbi->s_mount_opt, NOBH);
		}
	}
	/*
	 * The jbd2_journal_load will have done any necessary log recovery,
	 * so we can safely mount the rest of the filesystem now.
	 */

	root = ext4_iget(sb, EXT4_ROOT_INO);
	if (IS_ERR(root)) {
		printk(KERN_ERR "EXT4-fs: get root inode failed\n");
		ret = PTR_ERR(root);
		goto failed_mount4;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
		iput(root);
		printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
		goto failed_mount4;
	}
	sb->s_root = d_alloc_root(root);
	if (!sb->s_root) {
		printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
		iput(root);
		ret = -ENOMEM;
		goto failed_mount4;
	}

	ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);

	/* determine the minimum size of new large inodes, if present */
	if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
		sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
						     EXT4_GOOD_OLD_INODE_SIZE;
		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
				       EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
			if (sbi->s_want_extra_isize <
			    le16_to_cpu(es->s_want_extra_isize))
				sbi->s_want_extra_isize =
					le16_to_cpu(es->s_want_extra_isize);
			if (sbi->s_want_extra_isize <
			    le16_to_cpu(es->s_min_extra_isize))
				sbi->s_want_extra_isize =
					le16_to_cpu(es->s_min_extra_isize);
		}
	}
	/* Check if enough inode space is available */
	if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
							sbi->s_inode_size) {
		sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
						       EXT4_GOOD_OLD_INODE_SIZE;
		printk(KERN_INFO "EXT4-fs: required extra inode space not"
			"available.\n");
	}

	if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
		printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
				"requested data journaling mode\n");
		clear_opt(sbi->s_mount_opt, DELALLOC);
	} else if (test_opt(sb, DELALLOC))
		printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");

	ext4_ext_init(sb);
	err = ext4_mb_init(sb, needs_recovery);
	if (err) {
		printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n",
		       err);
		goto failed_mount4;
	}

	/*
	 * akpm: core read_super() calls in here with the superblock locked.
	 * That deadlocks, because orphan cleanup needs to lock the superblock
	 * in numerous places.  Here we just pop the lock - it's relatively
	 * harmless, because we are now ready to accept write_super() requests,
	 * and aviro says that's the only reason for hanging onto the
	 * superblock lock.
	 */
	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
	ext4_orphan_cleanup(sb, es);
	EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
	if (needs_recovery) {
		printk(KERN_INFO "EXT4-fs: recovery complete.\n");
		ext4_mark_recovery_complete(sb, es);
	}
	if (EXT4_SB(sb)->s_journal) {
		if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
			descr = " journalled data mode";
		else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
			descr = " ordered data mode";
		else
			descr = " writeback data mode";
	} else
		descr = "out journal";

	printk(KERN_INFO "EXT4-fs: mounted filesystem %s with%s\n",
	       sb->s_id, descr);

	lock_kernel();
	return 0;

cantfind_ext4:
	if (!silent)
		printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
		       sb->s_id);
	goto failed_mount;

failed_mount4:
	printk(KERN_ERR "EXT4-fs (device %s): mount failed\n", sb->s_id);
	if (sbi->s_journal) {
		jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
	}
failed_mount3:
	percpu_counter_destroy(&sbi->s_freeblocks_counter);
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
	percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
	kfree(sbi->s_group_desc);
failed_mount:
	if (sbi->s_proc) {
		remove_proc_entry("inode_readahead_blks", sbi->s_proc);
		remove_proc_entry(sb->s_id, ext4_proc_root);
	}
#ifdef CONFIG_QUOTA
	for (i = 0; i < MAXQUOTAS; i++)
		kfree(sbi->s_qf_names[i]);
#endif
	ext4_blkdev_remove(sbi);
	brelse(bh);
out_fail:
	sb->s_fs_info = NULL;
	kfree(sbi);
	lock_kernel();
	return ret;
}

Project: linux-2.6

static journal_t *ext4_get_dev_journal(struct super_block *sb,
				       dev_t j_dev)
{
	struct buffer_head *bh;
	journal_t *journal;
	ext4_fsblk_t start;
	ext4_fsblk_t len;
	int hblock, blocksize;
	ext4_fsblk_t sb_block;
	unsigned long offset;
	struct ext4_super_block *es;
	struct block_device *bdev;

	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

	bdev = ext4_blkdev_get(j_dev);
	if (bdev == NULL)
		return NULL;

	if (bd_claim(bdev, sb)) {
		printk(KERN_ERR
			"EXT4: failed to claim external journal device.\n");
		blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
		return NULL;
	}

	blocksize = sb->s_blocksize;
	hblock = bdev_hardsect_size(bdev);
	if (blocksize < hblock) {
		printk(KERN_ERR
			"EXT4-fs: blocksize too small for journal device.\n");
		goto out_bdev;
	}

	sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
	offset = EXT4_MIN_BLOCK_SIZE % blocksize;
	set_blocksize(bdev, blocksize);
	if (!(bh = __bread(bdev, sb_block, blocksize))) {
		printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
		       "external journal\n");
		goto out_bdev;
	}

	es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
	if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
	    !(le32_to_cpu(es->s_feature_incompat) &
	      EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
		printk(KERN_ERR "EXT4-fs: external journal has "
					"bad superblock\n");
		brelse(bh);
		goto out_bdev;
	}

	if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
		printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
		brelse(bh);
		goto out_bdev;
	}

	len = ext4_blocks_count(es);
	start = sb_block + 1;
	brelse(bh);	/* we're done with the superblock */

	journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
					start, len, blocksize);
	if (!journal) {
		printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
		goto out_bdev;
	}
	journal->j_private = sb;
	ll_rw_block(READ, 1, &journal->j_sb_buffer);
	wait_on_buffer(journal->j_sb_buffer);
	if (!buffer_uptodate(journal->j_sb_buffer)) {
		printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
		goto out_journal;
	}
	if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
		printk(KERN_ERR "EXT4-fs: External journal has more than one "
					"user (unsupported) - %d\n",
			be32_to_cpu(journal->j_superblock->s_nr_users));
		goto out_journal;
	}
	EXT4_SB(sb)->journal_bdev = bdev;
	ext4_init_journal_params(sb, journal);
	return journal;
out_journal:
	jbd2_journal_destroy(journal);
out_bdev:
	ext4_blkdev_put(bdev);
	return NULL;
}

Project: linux-2.6

static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct super_block *sb = dentry->d_sb;
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
	u64 fsid;

	if (test_opt(sb, MINIX_DF)) {
		sbi->s_overhead_last = 0;
	} else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
		ext4_group_t ngroups = sbi->s_groups_count, i;
		ext4_fsblk_t overhead = 0;
		smp_rmb();

		/*
		 * Compute the overhead (FS structures).  This is constant
		 * for a given filesystem unless the number of block groups
		 * changes so we cache the previous value until it does.
		 */

		/*
		 * All of the blocks before first_data_block are
		 * overhead
		 */
		overhead = le32_to_cpu(es->s_first_data_block);

		/*
		 * Add the overhead attributed to the superblock and
		 * block group descriptors.  If the sparse superblocks
		 * feature is turned on, then not all groups have this.
		 */
		for (i = 0; i < ngroups; i++) {
			overhead += ext4_bg_has_super(sb, i) +
				ext4_bg_num_gdb(sb, i);
			cond_resched();
		}

		/*
		 * Every block group has an inode bitmap, a block
		 * bitmap, and an inode table.
		 */
		overhead += ngroups * (2 + sbi->s_itb_per_group);
		sbi->s_overhead_last = overhead;
		smp_wmb();
		sbi->s_blocks_last = ext4_blocks_count(es);
	}

	buf->f_type = EXT4_SUPER_MAGIC;
	buf->f_bsize = sb->s_blocksize;
	buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
	buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
		       percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
	ext4_free_blocks_count_set(es, buf->f_bfree);
	buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
	if (buf->f_bfree < ext4_r_blocks_count(es))
		buf->f_bavail = 0;
	buf->f_files = le32_to_cpu(es->s_inodes_count);
	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
	es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
	buf->f_namelen = EXT4_NAME_LEN;
	fsid = le64_to_cpup((void *)es->s_uuid) ^
	       le64_to_cpup((void *)es->s_uuid + sizeof(u64));
	buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
	buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
	return 0;
}

Project: linux-2.6

static void ext4_put_super(struct super_block *sb)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
	int i, err;

	ext4_mb_release(sb);
	ext4_ext_release(sb);
	ext4_xattr_put_super(sb);
	if (sbi->s_journal) {
		err = jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
		if (err < 0)
			ext4_abort(sb, __func__,
				   "Couldn't clean up the journal");
	}
	if (!(sb->s_flags & MS_RDONLY)) {
		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
		es->s_state = cpu_to_le16(sbi->s_mount_state);
		ext4_commit_super(sb, es, 1);
	}
	if (sbi->s_proc) {
		remove_proc_entry("inode_readahead_blks", sbi->s_proc);
		remove_proc_entry(sb->s_id, ext4_proc_root);
	}

	for (i = 0; i < sbi->s_gdb_count; i++)
		brelse(sbi->s_group_desc[i]);
	kfree(sbi->s_group_desc);
	kfree(sbi->s_flex_groups);
	percpu_counter_destroy(&sbi->s_freeblocks_counter);
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
	percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
	brelse(sbi->s_sbh);
#ifdef CONFIG_QUOTA
	for (i = 0; i < MAXQUOTAS; i++)
		kfree(sbi->s_qf_names[i]);
#endif

	/* Debugging code just in case the in-memory inode orphan list
	 * isn't empty.  The on-disk one can be non-empty if we've
	 * detected an error and taken the fs readonly, but the
	 * in-memory list had better be clean by this point. */
	if (!list_empty(&sbi->s_orphan))
		dump_orphan_list(sb, sbi);
	J_ASSERT(list_empty(&sbi->s_orphan));

	invalidate_bdev(sb->s_bdev);
	if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
		/*
		 * Invalidate the journal device's buffers.  We don't want them
		 * floating about in memory - the physical journal device may
		 * hotswapped, and it breaks the `ro-after' testing code.
		 */
		sync_blockdev(sbi->journal_bdev);
		invalidate_bdev(sbi->journal_bdev);
		ext4_blkdev_remove(sbi);
	}
	sb->s_fs_info = NULL;
	kfree(sbi);
	return;
}

Project: linux-2.6

static void ext4_destroy_inode(struct inode *inode)
{
	if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
		printk("EXT4 Inode %p: orphan list check failed!\n",
			EXT4_I(inode));
		print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
				EXT4_I(inode), sizeof(struct ext4_inode_info),
				true);
		dump_stack();
	}
	kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
}

Project: linux-2.6

static void ext4_commit_super(struct super_block *sb,
			      struct ext4_super_block *es, int sync)
{
	struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;

	if (!sbh)
		return;
	if (buffer_write_io_error(sbh)) {
		/*
		 * Oh, dear.  A previous attempt to write the
		 * superblock failed.  This could happen because the
		 * USB device was yanked out.  Or it could happen to
		 * be a transient write error and maybe the block will
		 * be remapped.  Nothing we can do but to retry the
		 * write and hope for the best.
		 */
		printk(KERN_ERR "ext4: previous I/O error to "
		       "superblock detected for %s.\n", sb->s_id);
		clear_buffer_write_io_error(sbh);
		set_buffer_uptodate(sbh);
	}
	es->s_wtime = cpu_to_le32(get_seconds());
	ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
					&EXT4_SB(sb)->s_freeblocks_counter));
	es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
					&EXT4_SB(sb)->s_freeinodes_counter));

	BUFFER_TRACE(sbh, "marking dirty");
	mark_buffer_dirty(sbh);
	if (sync) {
		sync_dirty_buffer(sbh);
		if (buffer_write_io_error(sbh)) {
			printk(KERN_ERR "ext4: I/O error while writing "
			       "superblock for %s.\n", sb->s_id);
			clear_buffer_write_io_error(sbh);
			set_buffer_uptodate(sbh);
		}
	}
}

Project: linux-2.6

static int __init init_ext4_fs(void)
{
	int err;

	ext4_proc_root = proc_mkdir("fs/ext4", NULL);
	err = init_ext4_mballoc();
	if (err)
		return err;

	err = init_ext4_xattr();
	if (err)
		goto out2;
	err = init_inodecache();
	if (err)
		goto out1;
	err = register_filesystem(&ext4_fs_type);
	if (err)
		goto out;
#ifdef CONFIG_EXT4DEV_COMPAT
	err = register_filesystem(&ext4dev_fs_type);
	if (err) {
		unregister_filesystem(&ext4_fs_type);
		goto out;
	}
#endif
	return 0;
out:
	destroy_inodecache();
out1:
	exit_ext4_xattr();
out2:
	exit_ext4_mballoc();
	return err;
}

Project: linux-2.6

static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf,
			       size_t cnt, loff_t *ppos)
{
	unsigned long *p = PDE(file->f_path.dentry->d_inode)->data;
	char str[32];

	if (cnt >= sizeof(str))
		return -EINVAL;
	if (copy_from_user(str, buf, cnt))
		return -EFAULT;

	*p = simple_strtoul(str, NULL, 0);
	return cnt;
}

Project: linux-2.6

void ext4_journal_abort_handle(const char *caller, const char *err_fn,
		struct buffer_head *bh, handle_t *handle, int err)
{
	char nbuf[16];
	const char *errstr = ext4_decode_error(NULL, err, nbuf);

	BUG_ON(!ext4_handle_valid(handle));

	if (bh)
		BUFFER_TRACE(bh, "abort");

	if (!handle->h_err)
		handle->h_err = err;

	if (is_handle_aborted(handle))
		return;

	printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
	       caller, errstr, err_fn);

	jbd2_journal_abort_handle(handle);
}

Project: linux-2.6

static ssize_t ext4_quota_write(struct super_block *sb, int type,
				const char *data, size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
	int err = 0;
	int offset = off & (sb->s_blocksize - 1);
	int tocopy;
	int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
	size_t towrite = len;
	struct buffer_head *bh;
	handle_t *handle = journal_current_handle();

	if (EXT4_SB(sb)->s_journal && !handle) {
		printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)"
			" cancelled because transaction is not started.\n",
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}
	mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
	while (towrite > 0) {
		tocopy = sb->s_blocksize - offset < towrite ?
				sb->s_blocksize - offset : towrite;
		bh = ext4_bread(handle, inode, blk, 1, &err);
		if (!bh)
			goto out;
		if (journal_quota) {
			err = ext4_journal_get_write_access(handle, bh);
			if (err) {
				brelse(bh);
				goto out;
			}
		}
		lock_buffer(bh);
		memcpy(bh->b_data+offset, data, tocopy);
		flush_dcache_page(bh->b_page);
		unlock_buffer(bh);
		if (journal_quota)
			err = ext4_handle_dirty_metadata(handle, NULL, bh);
		else {
			/* Always do at least ordered writes for quotas */
			err = ext4_jbd2_file_inode(handle, inode);
			mark_buffer_dirty(bh);
		}
		brelse(bh);
		if (err)
			goto out;
		offset = 0;
		towrite -= tocopy;
		data += tocopy;
		blk++;
	}
out:
	if (len == towrite) {
		mutex_unlock(&inode->i_mutex);
		return err;
	}
	if (inode->i_size < off+len-towrite) {
		i_size_write(inode, off+len-towrite);
		EXT4_I(inode)->i_disksize = inode->i_size;
	}
	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	ext4_mark_inode_dirty(handle, inode);
	mutex_unlock(&inode->i_mutex);
	return len - towrite;
}

Project: linux-2.6

int __ext4_journal_stop(const char *where, handle_t *handle)
{
	struct super_block *sb;
	int err;
	int rc;

	if (!ext4_handle_valid(handle)) {
		/*
		 * Do this here since we don't call jbd2_journal_stop() in
		 * no-journal mode.
		 */
		current->journal_info = NULL;
		return 0;
	}
	sb = handle->h_transaction->t_journal->j_private;
	err = handle->h_err;
	rc = jbd2_journal_stop(handle);

	if (!err)
		err = rc;
	if (err)
		__ext4_std_error(sb, where, err);
	return err;
}

Project: linux-2.6

static int ext4_load_journal(struct super_block *sb,
			     struct ext4_super_block *es,
			     unsigned long journal_devnum)
{
	journal_t *journal;
	unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
	dev_t journal_dev;
	int err = 0;
	int really_read_only;

	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

	if (journal_devnum &&
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
		printk(KERN_INFO "EXT4-fs: external journal device major/minor "
			"numbers have changed\n");
		journal_dev = new_decode_dev(journal_devnum);
	} else
		journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));

	really_read_only = bdev_read_only(sb->s_bdev);

	/*
	 * Are we loading a blank journal or performing recovery after a
	 * crash?  For recovery, we need to check in advance whether we
	 * can get read-write access to the device.
	 */

	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
		if (sb->s_flags & MS_RDONLY) {
			printk(KERN_INFO "EXT4-fs: INFO: recovery "
					"required on readonly filesystem.\n");
			if (really_read_only) {
				printk(KERN_ERR "EXT4-fs: write access "
					"unavailable, cannot proceed.\n");
				return -EROFS;
			}
			printk(KERN_INFO "EXT4-fs: write access will "
			       "be enabled during recovery.\n");
		}
	}

	if (journal_inum && journal_dev) {
		printk(KERN_ERR "EXT4-fs: filesystem has both journal "
		       "and inode journals!\n");
		return -EINVAL;
	}

	if (journal_inum) {
		if (!(journal = ext4_get_journal(sb, journal_inum)))
			return -EINVAL;
	} else {
		if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
			return -EINVAL;
	}

	if (journal->j_flags & JBD2_BARRIER)
		printk(KERN_INFO "EXT4-fs: barriers enabled\n");
	else
		printk(KERN_INFO "EXT4-fs: barriers disabled\n");

	if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
		err = jbd2_journal_update_format(journal);
		if (err)  {
			printk(KERN_ERR "EXT4-fs: error updating journal.\n");
			jbd2_journal_destroy(journal);
			return err;
		}
	}

	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
		err = jbd2_journal_wipe(journal, !really_read_only);
	if (!err)
		err = jbd2_journal_load(journal);

	if (err) {
		printk(KERN_ERR "EXT4-fs: error loading journal.\n");
		jbd2_journal_destroy(journal);
		return err;
	}

	EXT4_SB(sb)->s_journal = journal;
	ext4_clear_journal_err(sb, es);

	if (journal_devnum &&
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
		es->s_journal_dev = cpu_to_le32(journal_devnum);
		sb->s_dirt = 1;

		/* Make sure we flush the recovery flag to disk. */
		ext4_commit_super(sb, es, 1);
	}

	return 0;
}

Project: linux-2.6

static int ext4_fill_flex_info(struct super_block *sb)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_group_desc *gdp = NULL;
	struct buffer_head *bh;
	ext4_group_t flex_group_count;
	ext4_group_t flex_group;
	int groups_per_flex = 0;
	int i;

	if (!sbi->s_es->s_log_groups_per_flex) {
		sbi->s_log_groups_per_flex = 0;
		return 1;
	}

	sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
	groups_per_flex = 1 << sbi->s_log_groups_per_flex;

	/* We allocate both existing and potentially added groups */
	flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
			((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
			      EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
	sbi->s_flex_groups = kzalloc(flex_group_count *
				     sizeof(struct flex_groups), GFP_KERNEL);
	if (sbi->s_flex_groups == NULL) {
		printk(KERN_ERR "EXT4-fs: not enough memory for "
				"%u flex groups\n", flex_group_count);
		goto failed;
	}

	for (i = 0; i < sbi->s_groups_count; i++) {
		gdp = ext4_get_group_desc(sb, i, &bh);

		flex_group = ext4_flex_group(sbi, i);
		sbi->s_flex_groups[flex_group].free_inodes +=
			ext4_free_inodes_count(sb, gdp);
		sbi->s_flex_groups[flex_group].free_blocks +=
			ext4_free_blks_count(sb, gdp);
	}

	return 1;
failed:
	return 0;
}

Project: linux-2.6

void ext4_warning(struct super_block *sb, const char *function,
		  const char *fmt, ...)
{
	va_list args;

	va_start(args, fmt);
	printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
	       sb->s_id, function);
	vprintk(fmt, args);
	printk("\n");
	va_end(args);
}

Project: linux-2.6

static const char *ext4_decode_error(struct super_block *sb, int errno,
				     char nbuf[16])
{
	char *errstr = NULL;

	switch (errno) {
	case -EIO:
		errstr = "IO failure";
		break;
	case -ENOMEM:
		errstr = "Out of memory";
		break;
	case -EROFS:
		if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
			errstr = "Journal has aborted";
		else
			errstr = "Readonly filesystem";
		break;
	default:
		/* If the caller passed in an extra buffer for unknown
		 * errors, textualise them now.  Else we just return
		 * NULL. */
		if (nbuf) {
			/* Check for truncated error codes... */
			if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
				errstr = nbuf;
		}
		break;
	}

	return errstr;
}

Project: linux-2.6

static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es)
{
	journal_t *journal;
	int j_errno;
	const char *errstr;

	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

	journal = EXT4_SB(sb)->s_journal;

	/*
	 * Now check for any error status which may have been recorded in the
	 * journal by a prior ext4_error() or ext4_abort()
	 */

	j_errno = jbd2_journal_errno(journal);
	if (j_errno) {
		char nbuf[16];

		errstr = ext4_decode_error(sb, j_errno, nbuf);
		ext4_warning(sb, __func__, "Filesystem error recorded "
			     "from previous mount: %s", errstr);
		ext4_warning(sb, __func__, "Marking fs in need of "
			     "filesystem check.");

		EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
		es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
		ext4_commit_super(sb, es, 1);

		jbd2_journal_clear_err(journal);
	}
}

Project: linux-2.6

static int ext4_blkdev_put(struct block_device *bdev)
{
	bd_release(bdev);
	return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
}

Project: linux-2.6

static journal_t *ext4_get_journal(struct super_block *sb,
				   unsigned int journal_inum)
{
	struct inode *journal_inode;
	journal_t *journal;

	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

	/* First, test for the existence of a valid inode on disk.  Bad
	 * things happen if we iget() an unused inode, as the subsequent
	 * iput() will try to delete it. */

	journal_inode = ext4_iget(sb, journal_inum);
	if (IS_ERR(journal_inode)) {
		printk(KERN_ERR "EXT4-fs: no journal found.\n");
		return NULL;
	}
	if (!journal_inode->i_nlink) {
		make_bad_inode(journal_inode);
		iput(journal_inode);
		printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
		return NULL;
	}

	jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
		  journal_inode, journal_inode->i_size);
	if (!S_ISREG(journal_inode->i_mode)) {
		printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
		iput(journal_inode);
		return NULL;
	}

	journal = jbd2_journal_init_inode(journal_inode);
	if (!journal) {
		printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
		iput(journal_inode);
		return NULL;
	}
	journal->j_private = sb;
	ext4_init_journal_params(sb, journal);
	return journal;
}

Project: linux-2.6

void __ext4_std_error(struct super_block *sb, const char *function, int errno)
{
	char nbuf[16];
	const char *errstr;

	/* Special case: if the error is EROFS, and we're not already
	 * inside a transaction, then there's really no point in logging
	 * an error. */
	if (errno == -EROFS && journal_current_handle() == NULL &&
	    (sb->s_flags & MS_RDONLY))
		return;

	errstr = ext4_decode_error(sb, errno, nbuf);
	printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
	       sb->s_id, function, errstr);

	ext4_handle_error(sb);
}

Project: linux-2.6

static void ext4_orphan_cleanup(struct super_block *sb,
				struct ext4_super_block *es)
{
	unsigned int s_flags = sb->s_flags;
	int nr_orphans = 0, nr_truncates = 0;
#ifdef CONFIG_QUOTA
	int i;
#endif
	if (!es->s_last_orphan) {
		jbd_debug(4, "no orphan inodes to clean up\n");
		return;
	}

	if (bdev_read_only(sb->s_bdev)) {
		printk(KERN_ERR "EXT4-fs: write access "
			"unavailable, skipping orphan cleanup.\n");
		return;
	}

	if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
		if (es->s_last_orphan)
			jbd_debug(1, "Errors on filesystem, "
				  "clearing orphan list.\n");
		es->s_last_orphan = 0;
		jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
		return;
	}

	if (s_flags & MS_RDONLY) {
		printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
		       sb->s_id);
		sb->s_flags &= ~MS_RDONLY;
	}
#ifdef CONFIG_QUOTA
	/* Needed for iput() to work correctly and not trash data */
	sb->s_flags |= MS_ACTIVE;
	/* Turn on quotas so that they are updated correctly */
	for (i = 0; i < MAXQUOTAS; i++) {
		if (EXT4_SB(sb)->s_qf_names[i]) {
			int ret = ext4_quota_on_mount(sb, i);
			if (ret < 0)
				printk(KERN_ERR
					"EXT4-fs: Cannot turn on journaled "
					"quota: error %d\n", ret);
		}
	}
#endif

	while (es->s_last_orphan) {
		struct inode *inode;

		inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
		if (IS_ERR(inode)) {
			es->s_last_orphan = 0;
			break;
		}

		list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
		DQUOT_INIT(inode);
		if (inode->i_nlink) {
			printk(KERN_DEBUG
				"%s: truncating inode %lu to %lld bytes\n",
				__func__, inode->i_ino, inode->i_size);
			jbd_debug(2, "truncating inode %lu to %lld bytes\n",
				  inode->i_ino, inode->i_size);
			ext4_truncate(inode);
			nr_truncates++;
		} else {
			printk(KERN_DEBUG
				"%s: deleting unreferenced inode %lu\n",
				__func__, inode->i_ino);
			jbd_debug(2, "deleting unreferenced inode %lu\n",
				  inode->i_ino);
			nr_orphans++;
		}
		iput(inode);  /* The delete magic happens here! */
	}

#define PLURAL(x) (x), ((x) == 1) ? "" : "s"

	if (nr_orphans)
		printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
		       sb->s_id, PLURAL(nr_orphans));
	if (nr_truncates)
		printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
		       sb->s_id, PLURAL(nr_truncates));
#ifdef CONFIG_QUOTA
	/* Turn quotas off */
	for (i = 0; i < MAXQUOTAS; i++) {
		if (sb_dqopt(sb)->files[i])
			vfs_quota_off(sb, i, 0);
	}
#endif
	sb->s_flags = s_flags; /* Restore MS_RDONLY status */
}

Project: linux-2.6

static int ext4_quota_on(struct super_block *sb, int type, int format_id,
			 char *name, int remount)
{
	int err;
	struct path path;

	if (!test_opt(sb, QUOTA))
		return -EINVAL;
	/* When remounting, no checks are needed and in fact, name is NULL */
	if (remount)
		return vfs_quota_on(sb, type, format_id, name, remount);

	err = kern_path(name, LOOKUP_FOLLOW, &path);
	if (err)
		return err;

	/* Quotafile not on the same filesystem? */
	if (path.mnt->mnt_sb != sb) {
		path_put(&path);
		return -EXDEV;
	}
	/* Journaling quota? */
	if (EXT4_SB(sb)->s_qf_names[type]) {
		/* Quotafile not in fs root? */
		if (path.dentry->d_parent != sb->s_root)
			printk(KERN_WARNING
				"EXT4-fs: Quota file not on filesystem root. "
				"Journaled quota will not work.\n");
	}

	/*
	 * When we journal data on quota file, we have to flush journal to see
	 * all updates to the file when we bypass pagecache...
	 */
	if (EXT4_SB(sb)->s_journal &&
	    ext4_should_journal_data(path.dentry->d_inode)) {
		/*
		 * We don't need to lock updates but journal_flush() could
		 * otherwise be livelocked...
		 */
		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
		err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
		if (err) {
			path_put(&path);
			return err;
		}
	}

	err = vfs_quota_on_path(sb, type, format_id, &path);
	path_put(&path);
	return err;
}

Project: linux-2.6

static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es)
{
	journal_t *journal = EXT4_SB(sb)->s_journal;

	if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
		BUG_ON(journal != NULL);
		return;
	}
	jbd2_journal_lock_updates(journal);
	if (jbd2_journal_flush(journal) < 0)
		goto out;

	lock_super(sb);
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
	    sb->s_flags & MS_RDONLY) {
		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
		sb->s_dirt = 0;
		ext4_commit_super(sb, es, 1);
	}
	unlock_super(sb);

out:
	jbd2_journal_unlock_updates(journal);
}

Project: linux-2.6

static void ext4_clear_inode(struct inode *inode)
{
#ifdef CONFIG_EXT4_FS_POSIX_ACL
	if (EXT4_I(inode)->i_acl &&
			EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
		posix_acl_release(EXT4_I(inode)->i_acl);
		EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
	}
	if (EXT4_I(inode)->i_default_acl &&
			EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
		posix_acl_release(EXT4_I(inode)->i_default_acl);
		EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
	}
#endif
	ext4_discard_preallocations(inode);
	if (EXT4_JOURNAL(inode))
		jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
				       &EXT4_I(inode)->jinode);
}

Project: linux-2.6

static void ext4_unlockfs(struct super_block *sb)
{
	if (EXT4_SB(sb)->s_journal && !(sb->s_flags & MS_RDONLY)) {
		lock_super(sb);
		/* Reser the needs_recovery flag before the fs is unlocked. */
		EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
		ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
		unlock_super(sb);
		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
	}
}

Project: linux-2.6

static int ext4_remount(struct super_block *sb, int *flags, char *data)
{
	struct ext4_super_block *es;
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	ext4_fsblk_t n_blocks_count = 0;
	unsigned long old_sb_flags;
	struct ext4_mount_options old_opts;
	ext4_group_t g;
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
	int err;
#ifdef CONFIG_QUOTA
	int i;
#endif

	/* Store the original options */
	old_sb_flags = sb->s_flags;
	old_opts.s_mount_opt = sbi->s_mount_opt;
	old_opts.s_resuid = sbi->s_resuid;
	old_opts.s_resgid = sbi->s_resgid;
	old_opts.s_commit_interval = sbi->s_commit_interval;
	old_opts.s_min_batch_time = sbi->s_min_batch_time;
	old_opts.s_max_batch_time = sbi->s_max_batch_time;
#ifdef CONFIG_QUOTA
	old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
	for (i = 0; i < MAXQUOTAS; i++)
		old_opts.s_qf_names[i] = sbi->s_qf_names[i];
#endif
	if (sbi->s_journal && sbi->s_journal->j_task->io_context)
		journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;

	/*
	 * Allow the "check" option to be passed as a remount option.
	 */
	if (!parse_options(data, sb, NULL, &journal_ioprio,
			   &n_blocks_count, 1)) {
		err = -EINVAL;
		goto restore_opts;
	}

	if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
		ext4_abort(sb, __func__, "Abort forced by user");

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
		((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);

	es = sbi->s_es;

	if (sbi->s_journal) {
		ext4_init_journal_params(sb, sbi->s_journal);
		set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
	}

	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
		n_blocks_count > ext4_blocks_count(es)) {
		if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
			err = -EROFS;
			goto restore_opts;
		}

		if (*flags & MS_RDONLY) {
			/*
			 * First of all, the unconditional stuff we have to do
			 * to disable replay of the journal when we next remount
			 */
			sb->s_flags |= MS_RDONLY;

			/*
			 * OK, test if we are remounting a valid rw partition
			 * readonly, and if so set the rdonly flag and then
			 * mark the partition as valid again.
			 */
			if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
			    (sbi->s_mount_state & EXT4_VALID_FS))
				es->s_state = cpu_to_le16(sbi->s_mount_state);

			/*
			 * We have to unlock super so that we can wait for
			 * transactions.
			 */
			if (sbi->s_journal) {
				unlock_super(sb);
				ext4_mark_recovery_complete(sb, es);
				lock_super(sb);
			}
		} else {
			int ret;
			if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
					~EXT4_FEATURE_RO_COMPAT_SUPP))) {
				printk(KERN_WARNING "EXT4-fs: %s: couldn't "
				       "remount RDWR because of unsupported "
				       "optional features (%x).\n", sb->s_id,
				(le32_to_cpu(sbi->s_es->s_feature_ro_compat) &
					~EXT4_FEATURE_RO_COMPAT_SUPP));
				err = -EROFS;
				goto restore_opts;
			}

			/*
			 * Make sure the group descriptor checksums
			 * are sane.  If they aren't, refuse to
			 * remount r/w.
			 */
			for (g = 0; g < sbi->s_groups_count; g++) {
				struct ext4_group_desc *gdp =
					ext4_get_group_desc(sb, g, NULL);

				if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
					printk(KERN_ERR
	       "EXT4-fs: ext4_remount: "
		"Checksum for group %u failed (%u!=%u)\n",
		g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
					       le16_to_cpu(gdp->bg_checksum));
					err = -EINVAL;
					goto restore_opts;
				}
			}

			/*
			 * If we have an unprocessed orphan list hanging
			 * around from a previously readonly bdev mount,
			 * require a full umount/remount for now.
			 */
			if (es->s_last_orphan) {
				printk(KERN_WARNING "EXT4-fs: %s: couldn't "
				       "remount RDWR because of unprocessed "
				       "orphan inode list.  Please "
				       "umount/remount instead.\n",
				       sb->s_id);
				err = -EINVAL;
				goto restore_opts;
			}

			/*
			 * Mounting a RDONLY partition read-write, so reread
			 * and store the current valid flag.  (It may have
			 * been changed by e2fsck since we originally mounted
			 * the partition.)
			 */
			if (sbi->s_journal)
				ext4_clear_journal_err(sb, es);
			sbi->s_mount_state = le16_to_cpu(es->s_state);
			if ((err = ext4_group_extend(sb, es, n_blocks_count)))
				goto restore_opts;
			if (!ext4_setup_super(sb, es, 0))
				sb->s_flags &= ~MS_RDONLY;
		}
	}
	if (sbi->s_journal == NULL)
		ext4_commit_super(sb, es, 1);

#ifdef CONFIG_QUOTA
	/* Release old quota file names */
	for (i = 0; i < MAXQUOTAS; i++)
		if (old_opts.s_qf_names[i] &&
		    old_opts.s_qf_names[i] != sbi->s_qf_names[i])
			kfree(old_opts.s_qf_names[i]);
#endif
	return 0;
restore_opts:
	sb->s_flags = old_sb_flags;
	sbi->s_mount_opt = old_opts.s_mount_opt;
	sbi->s_resuid = old_opts.s_resuid;
	sbi->s_resgid = old_opts.s_resgid;
	sbi->s_commit_interval = old_opts.s_commit_interval;
	sbi->s_min_batch_time = old_opts.s_min_batch_time;
	sbi->s_max_batch_time = old_opts.s_max_batch_time;
#ifdef CONFIG_QUOTA
	sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
	for (i = 0; i < MAXQUOTAS; i++) {
		if (sbi->s_qf_names[i] &&
		    old_opts.s_qf_names[i] != sbi->s_qf_names[i])
			kfree(sbi->s_qf_names[i]);
		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
	}
#endif
	return err;
}

Project: linux-2.6

__acquires(bitlock)
{
	va_list args;
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

	va_start(args, fmt);
	printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
	vprintk(fmt, args);
	printk("\n");
	va_end(args);

	if (test_opt(sb, ERRORS_CONT)) {
		EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
		es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
		ext4_commit_super(sb, es, 0);
		return;
	}
	ext4_unlock_group(sb, grp);
	ext4_handle_error(sb);
	/*
	 * We only get here in the ERRORS_RO case; relocking the group
	 * may be dangerous, but nothing bad will happen since the
	 * filesystem will have already been marked read/only and the
	 * journal has been aborted.  We return 1 as a hint to callers
	 * who might what to use the return value from
	 * ext4_grp_locked_error() to distinguish beween the
	 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
	 * aggressively from the ext4 function in question, with a
	 * more appropriate error code.
	 */
	ext4_lock_group(sb, grp);
	return;
}

Project: linux-2.6

static int ext4_ui_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, ext4_ui_proc_show, PDE(inode)->data);
}

Project: linux-2.6

static loff_t ext4_max_size(int blkbits, int has_huge_files)
{
	loff_t res;
	loff_t upper_limit = MAX_LFS_FILESIZE;

	/* small i_blocks in vfs inode? */
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
		/*
		 * CONFIG_LBD is not enabled implies the inode
		 * i_block represent total blocks in 512 bytes
		 * 32 == size of vfs inode i_blocks * 8
		 */
		upper_limit = (1LL << 32) - 1;

		/* total blocks in file system block size */
		upper_limit >>= (blkbits - 9);
		upper_limit <<= blkbits;
	}

	/* 32-bit extent-start container, ee_block */
	res = 1LL << 32;
	res <<= blkbits;
	res -= 1;

	/* Sanity check against vm- & vfs- imposed limits */
	if (res > upper_limit)
		res = upper_limit;

	return res;
}

Project: linux-2.6

static struct inode *ext4_alloc_inode(struct super_block *sb)
{
	struct ext4_inode_info *ei;

	ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
	if (!ei)
		return NULL;
#ifdef CONFIG_EXT4_FS_POSIX_ACL
	ei->i_acl = EXT4_ACL_NOT_CACHED;
	ei->i_default_acl = EXT4_ACL_NOT_CACHED;
#endif
	ei->vfs_inode.i_version = 1;
	ei->vfs_inode.i_data.writeback_index = 0;
	memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
	INIT_LIST_HEAD(&ei->i_prealloc_list);
	spin_lock_init(&ei->i_prealloc_lock);
	/*
	 * Note:  We can be called before EXT4_SB(sb)->s_journal is set,
	 * therefore it can be null here.  Don't check it, just initialize
	 * jinode.
	 */
	jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
	ei->i_reserved_data_blocks = 0;
	ei->i_reserved_meta_blocks = 0;
	ei->i_allocated_meta_blocks = 0;
	ei->i_delalloc_reserved_flag = 0;
	spin_lock_init(&(ei->i_block_reservation_lock));
	return &ei->vfs_inode;
}

Project: linux-2.6

static int parse_options(char *options, struct super_block *sb,
			 unsigned long *journal_devnum,
			 unsigned int *journal_ioprio,
			 ext4_fsblk_t *n_blocks_count, int is_remount)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	char *p;
	substring_t args[MAX_OPT_ARGS];
	int data_opt = 0;
	int option;
#ifdef CONFIG_QUOTA
	int qtype, qfmt;
	char *qname;
#endif
	ext4_fsblk_t last_block;

	if (!options)
		return 1;

	while ((p = strsep(&options, ",")) != NULL) {
		int token;
		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_bsd_df:
			clear_opt(sbi->s_mount_opt, MINIX_DF);
			break;
		case Opt_minix_df:
			set_opt(sbi->s_mount_opt, MINIX_DF);
			break;
		case Opt_grpid:
			set_opt(sbi->s_mount_opt, GRPID);
			break;
		case Opt_nogrpid:
			clear_opt(sbi->s_mount_opt, GRPID);
			break;
		case Opt_resuid:
			if (match_int(&args[0], &option))
				return 0;
			sbi->s_resuid = option;
			break;
		case Opt_resgid:
			if (match_int(&args[0], &option))
				return 0;
			sbi->s_resgid = option;
			break;
		case Opt_sb:
			/* handled by get_sb_block() instead of here */
			/* *sb_block = match_int(&args[0]); */
			break;
		case Opt_err_panic:
			clear_opt(sbi->s_mount_opt, ERRORS_CONT);
			clear_opt(sbi->s_mount_opt, ERRORS_RO);
			set_opt(sbi->s_mount_opt, ERRORS_PANIC);
			break;
		case Opt_err_ro:
			clear_opt(sbi->s_mount_opt, ERRORS_CONT);
			clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
			set_opt(sbi->s_mount_opt, ERRORS_RO);
			break;
		case Opt_err_cont:
			clear_opt(sbi->s_mount_opt, ERRORS_RO);
			clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
			set_opt(sbi->s_mount_opt, ERRORS_CONT);
			break;
		case Opt_nouid32:
			set_opt(sbi->s_mount_opt, NO_UID32);
			break;
		case Opt_debug:
			set_opt(sbi->s_mount_opt, DEBUG);
			break;
		case Opt_oldalloc:
			set_opt(sbi->s_mount_opt, OLDALLOC);
			break;
		case Opt_orlov:
			clear_opt(sbi->s_mount_opt, OLDALLOC);
			break;
#ifdef CONFIG_EXT4_FS_XATTR
		case Opt_user_xattr:
			set_opt(sbi->s_mount_opt, XATTR_USER);
			break;
		case Opt_nouser_xattr:
			clear_opt(sbi->s_mount_opt, XATTR_USER);
			break;
#else
		case Opt_user_xattr:
		case Opt_nouser_xattr:
			printk(KERN_ERR "EXT4 (no)user_xattr options "
			       "not supported\n");
			break;
#endif
#ifdef CONFIG_EXT4_FS_POSIX_ACL
		case Opt_acl:
			set_opt(sbi->s_mount_opt, POSIX_ACL);
			break;
		case Opt_noacl:
			clear_opt(sbi->s_mount_opt, POSIX_ACL);
			break;
#else
		case Opt_acl:
		case Opt_noacl:
			printk(KERN_ERR "EXT4 (no)acl options "
			       "not supported\n");
			break;
#endif
		case Opt_reservation:
			set_opt(sbi->s_mount_opt, RESERVATION);
			break;
		case Opt_noreservation:
			clear_opt(sbi->s_mount_opt, RESERVATION);
			break;
		case Opt_journal_update:
			/* @@@ FIXME */
			/* Eventually we will want to be able to create
			   a journal file here.  For now, only allow the
			   user to specify an existing inode to be the
			   journal file. */
			if (is_remount) {
				printk(KERN_ERR "EXT4-fs: cannot specify "
				       "journal on remount\n");
				return 0;
			}
			set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
			break;
		case Opt_journal_dev:
			if (is_remount) {
				printk(KERN_ERR "EXT4-fs: cannot specify "
				       "journal on remount\n");
				return 0;
			}
			if (match_int(&args[0], &option))
				return 0;
			*journal_devnum = option;
			break;
		case Opt_journal_checksum:
			set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
			break;
		case Opt_journal_async_commit:
			set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
			set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
			break;
		case Opt_noload:
			set_opt(sbi->s_mount_opt, NOLOAD);
			break;
		case Opt_commit:
			if (match_int(&args[0], &option))
				return 0;
			if (option < 0)
				return 0;
			if (option == 0)
				option = JBD2_DEFAULT_MAX_COMMIT_AGE;
			sbi->s_commit_interval = HZ * option;
			break;
		case Opt_max_batch_time:
			if (match_int(&args[0], &option))
				return 0;
			if (option < 0)
				return 0;
			if (option == 0)
				option = EXT4_DEF_MAX_BATCH_TIME;
			sbi->s_max_batch_time = option;
			break;
		case Opt_min_batch_time:
			if (match_int(&args[0], &option))
				return 0;
			if (option < 0)
				return 0;
			sbi->s_min_batch_time = option;
			break;
		case Opt_data_journal:
			data_opt = EXT4_MOUNT_JOURNAL_DATA;
			goto datacheck;
		case Opt_data_ordered:
			data_opt = EXT4_MOUNT_ORDERED_DATA;
			goto datacheck;
		case Opt_data_writeback:
			data_opt = EXT4_MOUNT_WRITEBACK_DATA;
		datacheck:
			if (is_remount) {
				if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
						!= data_opt) {
					printk(KERN_ERR
						"EXT4-fs: cannot change data "
						"mode on remount\n");
					return 0;
				}
			} else {
				sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
				sbi->s_mount_opt |= data_opt;
			}
			break;
		case Opt_data_err_abort:
			set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
			break;
		case Opt_data_err_ignore:
			clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
			break;
#ifdef CONFIG_QUOTA
		case Opt_usrjquota:
			qtype = USRQUOTA;
			goto set_qf_name;
		case Opt_grpjquota:
			qtype = GRPQUOTA;
set_qf_name:
			if ((sb_any_quota_enabled(sb) ||
			     sb_any_quota_suspended(sb)) &&
			    !sbi->s_qf_names[qtype]) {
				printk(KERN_ERR
				       "EXT4-fs: Cannot change journaled "
				       "quota options when quota turned on.\n");
				return 0;
			}
			qname = match_strdup(&args[0]);
			if (!qname) {
				printk(KERN_ERR
					"EXT4-fs: not enough memory for "
					"storing quotafile name.\n");
				return 0;
			}
			if (sbi->s_qf_names[qtype] &&
			    strcmp(sbi->s_qf_names[qtype], qname)) {
				printk(KERN_ERR
					"EXT4-fs: %s quota file already "
					"specified.\n", QTYPE2NAME(qtype));
				kfree(qname);
				return 0;
			}
			sbi->s_qf_names[qtype] = qname;
			if (strchr(sbi->s_qf_names[qtype], '/')) {
				printk(KERN_ERR
					"EXT4-fs: quotafile must be on "
					"filesystem root.\n");
				kfree(sbi->s_qf_names[qtype]);
				sbi->s_qf_names[qtype] = NULL;
				return 0;
			}
			set_opt(sbi->s_mount_opt, QUOTA);
			break;
		case Opt_offusrjquota:
			qtype = USRQUOTA;
			goto clear_qf_name;
		case Opt_offgrpjquota:
			qtype = GRPQUOTA;
clear_qf_name:
			if ((sb_any_quota_enabled(sb) ||
			     sb_any_quota_suspended(sb)) &&
			    sbi->s_qf_names[qtype]) {
				printk(KERN_ERR "EXT4-fs: Cannot change "
					"journaled quota options when "
					"quota turned on.\n");
				return 0;
			}
			/*
			 * The space will be released later when all options
			 * are confirmed to be correct
			 */
			sbi->s_qf_names[qtype] = NULL;
			break;
		case Opt_jqfmt_vfsold:
			qfmt = QFMT_VFS_OLD;
			goto set_qf_format;
		case Opt_jqfmt_vfsv0:
			qfmt = QFMT_VFS_V0;
set_qf_format:
			if ((sb_any_quota_enabled(sb) ||
			     sb_any_quota_suspended(sb)) &&
			    sbi->s_jquota_fmt != qfmt) {
				printk(KERN_ERR "EXT4-fs: Cannot change "
					"journaled quota options when "
					"quota turned on.\n");
				return 0;
			}
			sbi->s_jquota_fmt = qfmt;
			break;
		case Opt_quota:
		case Opt_usrquota:
			set_opt(sbi->s_mount_opt, QUOTA);
			set_opt(sbi->s_mount_opt, USRQUOTA);
			break;
		case Opt_grpquota:
			set_opt(sbi->s_mount_opt, QUOTA);
			set_opt(sbi->s_mount_opt, GRPQUOTA);
			break;
		case Opt_noquota:
			if (sb_any_quota_enabled(sb)) {
				printk(KERN_ERR "EXT4-fs: Cannot change quota "
					"options when quota turned on.\n");
				return 0;
			}
			clear_opt(sbi->s_mount_opt, QUOTA);
			clear_opt(sbi->s_mount_opt, USRQUOTA);
			clear_opt(sbi->s_mount_opt, GRPQUOTA);
			break;
#else
		case Opt_quota:
		case Opt_usrquota:
		case Opt_grpquota:
			printk(KERN_ERR
				"EXT4-fs: quota options not supported.\n");
			break;
		case Opt_usrjquota:
		case Opt_grpjquota:
		case Opt_offusrjquota:
		case Opt_offgrpjquota:
		case Opt_jqfmt_vfsold:
		case Opt_jqfmt_vfsv0:
			printk(KERN_ERR
				"EXT4-fs: journaled quota options not "
				"supported.\n");
			break;
		case Opt_noquota:
			break;
#endif
		case Opt_abort:
			set_opt(sbi->s_mount_opt, ABORT);
			break;
		case Opt_barrier:
			if (match_int(&args[0], &option))
				return 0;
			if (option)
				set_opt(sbi->s_mount_opt, BARRIER);
			else
				clear_opt(sbi->s_mount_opt, BARRIER);
			break;
		case Opt_ignore:
			break;
		case Opt_resize:
			if (!is_remount) {
				printk("EXT4-fs: resize option only available "
					"for remount\n");
				return 0;
			}
			if (match_int(&args[0], &option) != 0)
				return 0;
			*n_blocks_count = option;
			break;
		case Opt_nobh:
			set_opt(sbi->s_mount_opt, NOBH);
			break;
		case Opt_bh:
			clear_opt(sbi->s_mount_opt, NOBH);
			break;
		case Opt_extents:
			if (!EXT4_HAS_INCOMPAT_FEATURE(sb,
					EXT4_FEATURE_INCOMPAT_EXTENTS)) {
				ext4_warning(sb, __func__,
					"extents feature not enabled "
					"on this filesystem, use tune2fs");
				return 0;
			}
			set_opt(sbi->s_mount_opt, EXTENTS);
			break;
		case Opt_noextents:
			/*
			 * When e2fsprogs support resizing an already existing
			 * ext3 file system to greater than 2**32 we need to
			 * add support to block allocator to handle growing
			 * already existing block  mapped inode so that blocks
			 * allocated for them fall within 2**32
			 */
			last_block = ext4_blocks_count(sbi->s_es) - 1;
			if (last_block  > 0xffffffffULL) {
				printk(KERN_ERR "EXT4-fs: Filesystem too "
						"large to mount with "
						"-o noextents options\n");
				return 0;
			}
			clear_opt(sbi->s_mount_opt, EXTENTS);
			break;
		case Opt_i_version:
			set_opt(sbi->s_mount_opt, I_VERSION);
			sb->s_flags |= MS_I_VERSION;
			break;
		case Opt_nodelalloc:
			clear_opt(sbi->s_mount_opt, DELALLOC);
			break;
		case Opt_stripe:
			if (match_int(&args[0], &option))
				return 0;
			if (option < 0)
				return 0;
			sbi->s_stripe = option;
			break;
		case Opt_delalloc:
			set_opt(sbi->s_mount_opt, DELALLOC);
			break;
		case Opt_inode_readahead_blks:
			if (match_int(&args[0], &option))
				return 0;
			if (option < 0 || option > (1 << 30))
				return 0;
			sbi->s_inode_readahead_blks = option;
			break;
		case Opt_journal_ioprio:
			if (match_int(&args[0], &option))
				return 0;
			if (option < 0 || option > 7)
				break;
			*journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
							    option);
			break;
		default:
			printk(KERN_ERR
			       "EXT4-fs: Unrecognized mount option \"%s\" "
			       "or missing value\n", p);
			return 0;
		}
	}
#ifdef CONFIG_QUOTA
	if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
		if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
		     sbi->s_qf_names[USRQUOTA])
			clear_opt(sbi->s_mount_opt, USRQUOTA);

		if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
		     sbi->s_qf_names[GRPQUOTA])
			clear_opt(sbi->s_mount_opt, GRPQUOTA);

		if ((sbi->s_qf_names[USRQUOTA] &&
				(sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
		    (sbi->s_qf_names[GRPQUOTA] &&
				(sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
			printk(KERN_ERR "EXT4-fs: old and new quota "
					"format mixing.\n");
			return 0;
		}

		if (!sbi->s_jquota_fmt) {
			printk(KERN_ERR "EXT4-fs: journaled quota format "
					"not specified.\n");
			return 0;
		}
	} else {
		if (sbi->s_jquota_fmt) {
			printk(KERN_ERR "EXT4-fs: journaled quota format "
					"specified with no journaling "
					"enabled.\n");
			return 0;
		}
	}
#endif
	return 1;
}

Project: linux-2.6

static struct block_device *ext4_blkdev_get(dev_t dev)
{
	struct block_device *bdev;
	char b[BDEVNAME_SIZE];

	bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
	if (IS_ERR(bdev))
		goto fail;
	return bdev;

fail:
	printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
			__bdevname(dev, b), PTR_ERR(bdev));
	return NULL;
}

Project: linux-2.6

static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
{
	loff_t res = EXT4_NDIR_BLOCKS;
	int meta_blocks;
	loff_t upper_limit;
	/* This is calculated to be the largest file size for a
	 * dense, bitmapped file such that the total number of
	 * sectors in the file, including data and all indirect blocks,
	 * does not exceed 2^48 -1
	 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
	 * total number of  512 bytes blocks of the file
	 */

	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
		/*
		 * !has_huge_files or CONFIG_LBD is not enabled
		 * implies the inode i_block represent total blocks in
		 * 512 bytes 32 == size of vfs inode i_blocks * 8
		 */
		upper_limit = (1LL << 32) - 1;

		/* total blocks in file system block size */
		upper_limit >>= (bits - 9);

	} else {
		/*
		 * We use 48 bit ext4_inode i_blocks
		 * With EXT4_HUGE_FILE_FL set the i_blocks
		 * represent total number of blocks in
		 * file system block size
		 */
		upper_limit = (1LL << 48) - 1;

	}

	/* indirect blocks */
	meta_blocks = 1;
	/* double indirect blocks */
	meta_blocks += 1 + (1LL << (bits-2));
	/* tripple indirect blocks */
	meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));

	upper_limit -= meta_blocks;
	upper_limit <<= bits;

	res += 1LL << (bits-2);
	res += 1LL << (2*(bits-2));
	res += 1LL << (3*(bits-2));
	res <<= bits;
	if (res > upper_limit)
		res = upper_limit;

	if (res > MAX_LFS_FILESIZE)
		res = MAX_LFS_FILESIZE;

	return res;
}

Project: linux-2.6

static int ext4_dquot_drop(struct inode *inode)
{
	handle_t *handle;
	int ret, err;

	/* We may delete quota structure so we need to reserve enough blocks */
	handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
	if (IS_ERR(handle)) {
		/*
		 * We call dquot_drop() anyway to at least release references
		 * to quota structures so that umount does not hang.
		 */
		dquot_drop(inode);
		return PTR_ERR(handle);
	}
	ret = dquot_drop(inode);
	err = ext4_journal_stop(handle);
	if (!ret)
		ret = err;
	return ret;
}

Project: linux-2.6

void ext4_abort(struct super_block *sb, const char *function,
		const char *fmt, ...)
{
	va_list args;

	printk(KERN_CRIT "ext4_abort called.\n");

	va_start(args, fmt);
	printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
	vprintk(fmt, args);
	printk("\n");
	va_end(args);

	if (test_opt(sb, ERRORS_PANIC))
		panic("EXT4-fs panic from previous error\n");

	if (sb->s_flags & MS_RDONLY)
		return;

	printk(KERN_CRIT "Remounting filesystem read-only\n");
	EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
	sb->s_flags |= MS_RDONLY;
	EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
	if (EXT4_SB(sb)->s_journal)
		jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
}

Project: linux-2.6

handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
{
	journal_t *journal;

	if (sb->s_flags & MS_RDONLY)
		return ERR_PTR(-EROFS);

	/* Special case here: if the journal has aborted behind our
	 * backs (eg. EIO in the commit thread), then we still need to
	 * take the FS itself readonly cleanly. */
	journal = EXT4_SB(sb)->s_journal;
	if (journal) {
		if (is_journal_aborted(journal)) {
			ext4_abort(sb, __func__,
				   "Detected aborted journal");
			return ERR_PTR(-EROFS);
		}
		return jbd2_journal_start(journal, nblocks);
	}
	/*
	 * We're not journaling, return the appropriate indication.
	 */
	current->journal_info = EXT4_NOJOURNAL_HANDLE;
	return current->journal_info;
}

Project: linux-2.6

static int ext4_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
	return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
}

Project: linux-2.6

static ext4_fsblk_t get_sb_block(void **data)
{
	ext4_fsblk_t	sb_block;
	char		*options = (char *) *data;

	if (!options || strncmp(options, "sb=", 3) != 0)
		return 1;	/* Default location */
	options += 3;
	/*todo: use simple_strtoll with >32bit ext4 */
	sb_block = simple_strtoul(options, &options, 0);
	if (*options && *options != ',') {
		printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
		       (char *) *data);
		return 1;
	}
	if (*options == ',')
		options++;
	*data = (void *) options;
	return sb_block;
}

Project: linux-2.6

static void __exit exit_ext4_fs(void)
{
	unregister_filesystem(&ext4_fs_type);
#ifdef CONFIG_EXT4DEV_COMPAT
	unregister_filesystem(&ext4dev_fs_type);
#endif
	destroy_inodecache();
	exit_ext4_xattr();
	exit_ext4_mballoc();
	remove_proc_entry("fs/ext4", NULL);
}

Project: linux-2.6

void ext4_error(struct super_block *sb, const char *function,
		const char *fmt, ...)
{
	va_list args;

	va_start(args, fmt);
	printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
	vprintk(fmt, args);
	printk("\n");
	va_end(args);

	ext4_handle_error(sb);
}

Project: linux-2.6

static int ext4_quota_on_mount(struct super_block *sb, int type)
{
	return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
			EXT4_SB(sb)->s_jquota_fmt, type);
}

Project: linux-2.6

static void ext4_write_super_lockfs(struct super_block *sb)
{
	sb->s_dirt = 0;

	if (!(sb->s_flags & MS_RDONLY)) {
		journal_t *journal = EXT4_SB(sb)->s_journal;

		if (journal) {
			/* Now we set up the journal barrier. */
			jbd2_journal_lock_updates(journal);

			/*
			 * We don't want to clear needs_recovery flag when we
			 * failed to flush the journal.
			 */
			if (jbd2_journal_flush(journal) < 0)
				return;
		}

		/* Journal blocked and flushed, clear needs_recovery flag. */
		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
		ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
	}
}

Project: linux-2.6

static int ext4_check_descriptors(struct super_block *sb)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
	ext4_fsblk_t last_block;
	ext4_fsblk_t block_bitmap;
	ext4_fsblk_t inode_bitmap;
	ext4_fsblk_t inode_table;
	int flexbg_flag = 0;
	ext4_group_t i;

	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
		flexbg_flag = 1;

	ext4_debug("Checking group descriptors");

	for (i = 0; i < sbi->s_groups_count; i++) {
		struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);

		if (i == sbi->s_groups_count - 1 || flexbg_flag)
			last_block = ext4_blocks_count(sbi->s_es) - 1;
		else
			last_block = first_block +
				(EXT4_BLOCKS_PER_GROUP(sb) - 1);

		block_bitmap = ext4_block_bitmap(sb, gdp);
		if (block_bitmap < first_block || block_bitmap > last_block) {
			printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
			       "Block bitmap for group %u not in group "
			       "(block %llu)!\n", i, block_bitmap);
			return 0;
		}
		inode_bitmap = ext4_inode_bitmap(sb, gdp);
		if (inode_bitmap < first_block || inode_bitmap > last_block) {
			printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
			       "Inode bitmap for group %u not in group "
			       "(block %llu)!\n", i, inode_bitmap);
			return 0;
		}
		inode_table = ext4_inode_table(sb, gdp);
		if (inode_table < first_block ||
		    inode_table + sbi->s_itb_per_group - 1 > last_block) {
			printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
			       "Inode table for group %u not in group "
			       "(block %llu)!\n", i, inode_table);
			return 0;
		}
		spin_lock(sb_bgl_lock(sbi, i));
		if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
			printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
			       "Checksum for group %u failed (%u!=%u)\n",
			       i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
			       gdp)), le16_to_cpu(gdp->bg_checksum));
			if (!(sb->s_flags & MS_RDONLY)) {
				spin_unlock(sb_bgl_lock(sbi, i));
				return 0;
			}
		}
		spin_unlock(sb_bgl_lock(sbi, i));
		if (!flexbg_flag)
			first_block += EXT4_BLOCKS_PER_GROUP(sb);
	}

	ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
	sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
	return 1;
}

Project: linux-2.6

static int ext4_ui_proc_show(struct seq_file *m, void *v)
{
	unsigned int *p = m->private;

	seq_printf(m, "%u\n", *p);
	return 0;
}

Project: linux-2.6

static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
			    int read_only)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	int res = 0;

	if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
		printk(KERN_ERR "EXT4-fs warning: revision level too high, "
		       "forcing read-only mode\n");
		res = MS_RDONLY;
	}
	if (read_only)
		return res;
	if (!(sbi->s_mount_state & EXT4_VALID_FS))
		printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
		       "running e2fsck is recommended\n");
	else if ((sbi->s_mount_state & EXT4_ERROR_FS))
		printk(KERN_WARNING
		       "EXT4-fs warning: mounting fs with errors, "
		       "running e2fsck is recommended\n");
	else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
		 le16_to_cpu(es->s_mnt_count) >=
		 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
		printk(KERN_WARNING
		       "EXT4-fs warning: maximal mount count reached, "
		       "running e2fsck is recommended\n");
	else if (le32_to_cpu(es->s_checkinterval) &&
		(le32_to_cpu(es->s_lastcheck) +
			le32_to_cpu(es->s_checkinterval) <= get_seconds()))
		printk(KERN_WARNING
		       "EXT4-fs warning: checktime reached, "
		       "running e2fsck is recommended\n");
	if (!sbi->s_journal) 
		es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
	if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
		es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
	le16_add_cpu(&es->s_mnt_count, 1);
	es->s_mtime = cpu_to_le32(get_seconds());
	ext4_update_dynamic_rev(sb);
	if (sbi->s_journal)
		EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);

	ext4_commit_super(sb, es, 1);
	if (test_opt(sb, DEBUG))
		printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
				"bpg=%lu, ipg=%lu, mo=%04lx]\n",
			sb->s_blocksize,
			sbi->s_groups_count,
			EXT4_BLOCKS_PER_GROUP(sb),
			EXT4_INODES_PER_GROUP(sb),
			sbi->s_mount_opt);

	if (EXT4_SB(sb)->s_journal) {
		printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n",
		       sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" :
		       "external", EXT4_SB(sb)->s_journal->j_devname);
	} else {
		printk(KERN_INFO "EXT4 FS on %s, no journal\n", sb->s_id);
	}
	return res;
}

Project: linux-2.6

static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);

	journal->j_commit_interval = sbi->s_commit_interval;
	journal->j_min_batch_time = sbi->s_min_batch_time;
	journal->j_max_batch_time = sbi->s_max_batch_time;

	spin_lock(&journal->j_state_lock);
	if (test_opt(sb, BARRIER))
		journal->j_flags |= JBD2_BARRIER;
	else
		journal->j_flags &= ~JBD2_BARRIER;
	if (test_opt(sb, DATA_ERR_ABORT))
		journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
	else
		journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
	spin_unlock(&journal->j_state_lock);
}

Project: linux-2.6

void ext4_update_dynamic_rev(struct super_block *sb)
{
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

	if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
		return;

	ext4_warning(sb, __func__,
		     "updating to rev %d because of new feature flag, "
		     "running e2fsck is recommended",
		     EXT4_DYNAMIC_REV);

	es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
	es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
	es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
	/* leave es->s_feature_*compat flags alone */
	/* es->s_uuid will be set by e2fsck if empty */

	/*
	 * The rest of the superblock fields should be zero, and if not it
	 * means they are likely already in use, so leave them alone.  We
	 * can leave it up to e2fsck to clean up any inconsistencies there.
	 */
}