diff options
| author | Josef Bacik <josef@toxicpanda.com> | 2020-10-16 11:29:19 -0400 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-12-08 15:53:42 +0100 |
| commit | 882dbe0cec9651bf6a6df500178149453726c1e1 (patch) | |
| tree | 9e37e4f0081a984a96ad076ce5afbe1ef69ae224 /fs/btrfs/disk-io.c | |
| parent | 42437a6386ffeaaf200731e73d723ea491f3fe7d (diff) | |
btrfs: introduce mount option rescue=ignoredatacsums
There are cases where you can end up with bad data csums because of
misbehaving applications. This happens when an application modifies a
buffer in-flight when doing an O_DIRECT write. In order to recover the
file we need a way to turn off data checksums so you can copy the file
off, and then you can delete the file and restore it properly later.
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/disk-io.c')
| -rw-r--r-- | fs/btrfs/disk-io.c | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index d229f6c25f293..646dde5883a68 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -2329,16 +2329,19 @@ static int btrfs_read_roots(struct btrfs_fs_info *fs_info) btrfs_init_devices_late(fs_info); } - location.objectid = BTRFS_CSUM_TREE_OBJECTID; - root = btrfs_read_tree_root(tree_root, &location); - if (IS_ERR(root)) { - if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) { - ret = PTR_ERR(root); - goto out; + /* If IGNOREDATACSUMS is set don't bother reading the csum root. */ + if (!btrfs_test_opt(fs_info, IGNOREDATACSUMS)) { + location.objectid = BTRFS_CSUM_TREE_OBJECTID; + root = btrfs_read_tree_root(tree_root, &location); + if (IS_ERR(root)) { + if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) { + ret = PTR_ERR(root); + goto out; + } + } else { + set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); + fs_info->csum_root = root; } - } else { - set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); - fs_info->csum_root = root; } /* |