[1/3] Btrfs-progs: fsck: clear out log tree in repair mode

Commit Message

Wang Shilong April 24, 2014, 3:19 a.m. UTC

Repair mode will commit transaction which will make us
fail to load log tree anymore.

Give a warning to common users, if they really want to
coninue, we will clear out log tree.

Signed-off-by: Wang Shilong <[e-mail]>
---
 cmds-check.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

Patch

diff --git a/cmds-check.c b/cmds-check.c
index 93f9ae6..15806a4 100644
--- a/cmds-check.c
+++ b/cmds-check.c
@@ -6615,6 +6615,22 @@  out:
 	return ret;
 }
 
+static int zero_log_tree(struct btrfs_root *root)
+{
+	struct btrfs_trans_handle *trans;
+	int ret;
+
+	trans = btrfs_start_transaction(root, 1);
+	if (IS_ERR(trans)) {
+		ret = PTR_ERR(trans);
+		return ret;
+	}
+	btrfs_set_super_log_root(root->fs_info->super_copy, 0);
+	btrfs_set_super_log_root_level(root->fs_info->super_copy, 0);
+	ret = btrfs_commit_transaction(trans, root);
+	return ret;
+}
+
 static struct option long_options[] = {
 	{ "super", 1, NULL, 's' },
 	{ "repair", 0, NULL, 0 },
@@ -6719,6 +6735,23 @@  int cmd_check(int argc, char **argv)
 	}
 
 	root = info->fs_root;
+	/*
+	 * repair mode will force us to commit transaction which
+	 * will make us fail to load log tree when mounting.
+	 */
+	if (repair && btrfs_super_log_root(info->super_copy)) {
+		ret = ask_user("repair mode will force to clear out log tree, Are you sure?");
+		if (!ret) {
+			ret = 1;
+			goto close_out;
+		}
+		ret = zero_log_tree(root);
+		if (ret) {
+			fprintf(stderr, "fail to zero log tree\n");
+			goto close_out;
+		}
+	}
+
 	uuid_unparse(info->super_copy->fsid, uuidbuf);
 	printf("Checking filesystem on %s\nUUID: %s\n", argv[optind], uuidbuf);