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/super.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/super.c')
| -rw-r--r-- | fs/btrfs/super.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 9bc46c048978..6bbd4f04b28d 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -361,6 +361,7 @@ enum { Opt_usebackuproot, Opt_nologreplay, Opt_ignorebadroots, + Opt_ignoredatacsums, /* Deprecated options */ Opt_recovery, @@ -458,6 +459,8 @@ static const match_table_t rescue_tokens = { {Opt_nologreplay, "nologreplay"}, {Opt_ignorebadroots, "ignorebadroots"}, {Opt_ignorebadroots, "ibadroots"}, + {Opt_ignoredatacsums, "ignoredatacsums"}, + {Opt_ignoredatacsums, "idatacsums"}, {Opt_err, NULL}, }; @@ -505,6 +508,10 @@ static int parse_rescue_options(struct btrfs_fs_info *info, const char *options) btrfs_set_and_info(info, IGNOREBADROOTS, "ignoring bad roots"); break; + case Opt_ignoredatacsums: + btrfs_set_and_info(info, IGNOREDATACSUMS, + "ignoring data csums"); + break; case Opt_err: btrfs_info(info, "unrecognized rescue option '%s'", p); ret = -EINVAL; @@ -991,7 +998,8 @@ check: goto out; if (check_ro_option(info, BTRFS_MOUNT_NOLOGREPLAY, "nologreplay") || - check_ro_option(info, BTRFS_MOUNT_IGNOREBADROOTS, "ignorebadroots")) + check_ro_option(info, BTRFS_MOUNT_IGNOREBADROOTS, "ignorebadroots") || + check_ro_option(info, BTRFS_MOUNT_IGNOREDATACSUMS, "ignoredatacsums")) ret = -EINVAL; out: if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE) && @@ -1449,6 +1457,8 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) print_rescue_option(seq, "usebackuproot", &printed); if (btrfs_test_opt(info, IGNOREBADROOTS)) print_rescue_option(seq, "ignorebadroots", &printed); + if (btrfs_test_opt(info, IGNOREDATACSUMS)) + print_rescue_option(seq, "ignoredatacsums", &printed); if (btrfs_test_opt(info, FLUSHONCOMMIT)) seq_puts(seq, ",flushoncommit"); if (btrfs_test_opt(info, DISCARD_SYNC)) |