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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>
This commit is contained in:
David Sterba 2012-03-06 00:06:18 +01:00 committed by Chris Mason
parent 914b20070b
commit fcd1f065da
1 changed files with 19 additions and 6 deletions
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25
fs/btrfs/disk-io.c
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@ -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 (read_only)
return;
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 (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR)
if (read_only)
return 0;
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)