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Commit fcd1f065 authored by David Sterba's avatar David Sterba Committed by Chris Mason
Browse files

Btrfs: enhance superblock sanity checks 



Validate checksum algorithm during mount and prevent BUG_ON later in
btrfs_super_csum_size.

Signed-off-by: default avatarDavid Sterba <dsterba@suse.cz>
parent 914b2007

fs/btrfs/disk-io.c

+18 −5
Original line number Diff line number Diff line
@@ -48,7 +48,7 @@ 
static struct extent_io_ops btree_extent_io_ops;

static void end_workqueue_fn(struct btrfs_work *work);

static void free_fs_root(struct btrfs_root *root);

static void btrfs_check_super_valid(struct btrfs_fs_info *fs_info,

static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,

				    int read_only);

static void btrfs_destroy_ordered_operations(struct btrfs_root *root);

static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
@@ -2135,7 +2135,12 @@ int open_ctree(struct super_block *sb, 
	/* check FS state, whether FS is broken. */

	fs_info->fs_state |= btrfs_super_flags(disk_super);



	btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY);

	ret = btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY);

	if (ret) {

		printk(KERN_ERR "btrfs: superblock contains fatal errors\n");

		err = ret;

		goto fail_alloc;

	}



	/*

	 * run through our array of backup supers and setup
@@ -3324,17 +3329,25 @@ out: 
	return 0;

}



static void btrfs_check_super_valid(struct btrfs_fs_info *fs_info,

static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,

			      int read_only)

{

	if (btrfs_super_csum_type(fs_info->super_copy) >= ARRAY_SIZE(btrfs_csum_sizes)) {

		printk(KERN_ERR "btrfs: unsupported checksum algorithm\n");

		return -EINVAL;

	}



	if (read_only)

		return;

		return 0;



	if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR)

	if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) {

		printk(KERN_WARNING "warning: mount fs with errors, "

		       "running btrfsck is recommended\n");

	}



	return 0;

}



int btrfs_error_commit_super(struct btrfs_root *root)

{

	int ret;