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| author | David Sterba <dsterba@suse.cz> | 2012-03-06 00:06:18 +0100 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2012-03-28 20:30:28 -0400 |
| commit | fcd1f065daca593badb7f99d473639cf3b551795 (patch) | |
| tree | b4dda48c9db913270d66344a2787829149b3a2bd /fs | |
| parent | 914b20070b413ca10f832c45a58b2894990f065f (diff) | |
| download | linux-fcd1f065daca593badb7f99d473639cf3b551795.tar.bz2 | |
Btrfs: enhance superblock sanity checks
Validate checksum algorithm during mount and prevent BUG_ON later in
btrfs_super_csum_size.
Signed-off-by: David Sterba <dsterba@suse.cz>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/disk-io.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 438993e3d832..38c2ee1ca0d5 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -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 @@ -3324,15 +3329,23 @@ 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) |