Btrfs: add mount option to force UUID tree checking
This should never be needed, but since all functions are there
to check and rebuild the UUID tree, a mount option is added that
allows to force this check and rebuild procedure.
Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 8c95476..0ef9d86 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1998,6 +1998,7 @@
#define BTRFS_MOUNT_CHECK_INTEGRITY (1 << 20)
#define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
#define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR (1 << 22)
+#define BTRFS_MOUNT_RESCAN_UUID_TREE (1 << 23)
#define BTRFS_DEFAULT_COMMIT_INTERVAL (30)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index e7ef82a..00914a6 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2929,7 +2929,8 @@
close_ctree(tree_root);
return ret;
}
- } else if (check_uuid_tree) {
+ } else if (check_uuid_tree ||
+ btrfs_test_opt(tree_root, RESCAN_UUID_TREE)) {
pr_info("btrfs: checking UUID tree\n");
ret = btrfs_check_uuid_tree(fs_info);
if (ret) {
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 1bd0bb5..57090b4 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -321,7 +321,7 @@
Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache,
Opt_no_space_cache, Opt_recovery, Opt_skip_balance,
Opt_check_integrity, Opt_check_integrity_including_extent_data,
- Opt_check_integrity_print_mask, Opt_fatal_errors,
+ Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree,
Opt_commit_interval,
Opt_err,
};
@@ -362,6 +362,7 @@
{Opt_check_integrity, "check_int"},
{Opt_check_integrity_including_extent_data, "check_int_data"},
{Opt_check_integrity_print_mask, "check_int_print_mask=%d"},
+ {Opt_rescan_uuid_tree, "rescan_uuid_tree"},
{Opt_fatal_errors, "fatal_errors=%s"},
{Opt_commit_interval, "commit=%d"},
{Opt_err, NULL},
@@ -572,6 +573,9 @@
case Opt_space_cache:
btrfs_set_opt(info->mount_opt, SPACE_CACHE);
break;
+ case Opt_rescan_uuid_tree:
+ btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE);
+ break;
case Opt_no_space_cache:
printk(KERN_INFO "btrfs: disabling disk space caching\n");
btrfs_clear_opt(info->mount_opt, SPACE_CACHE);
@@ -979,6 +983,8 @@
seq_puts(seq, ",space_cache");
else
seq_puts(seq, ",nospace_cache");
+ if (btrfs_test_opt(root, RESCAN_UUID_TREE))
+ seq_puts(seq, ",rescan_uuid_tree");
if (btrfs_test_opt(root, CLEAR_CACHE))
seq_puts(seq, ",clear_cache");
if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))