btrfs: do not write supers if we have an fs error

[sfrench/cifs-2.6.git] / fs / btrfs / tree-log.c

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index e4820e88cba037e8ea975f4b3f486a9140648f5e..324a9a078b6ae93f57b6bc6a83a6bc65e36e1a1b 100644 (file)
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -3302,6 +3302,22 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
         *    begins and releases it only after writing its superblock.
         */
        mutex_lock(&fs_info->tree_log_mutex);
+
+       /*
+        * The previous transaction writeout phase could have failed, and thus
+        * marked the fs in an error state.  We must not commit here, as we
+        * could have updated our generation in the super_for_commit and
+        * writing the super here would result in transid mismatches.  If there
+        * is an error here just bail.
+        */
+       if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
+               ret = -EIO;
+               btrfs_set_log_full_commit(trans);
+               btrfs_abort_transaction(trans, ret);
+               mutex_unlock(&fs_info->tree_log_mutex);
+               goto out_wake_log_root;
+       }
+
        btrfs_set_super_log_root(fs_info->super_for_commit, log_root_start);
        btrfs_set_super_log_root_level(fs_info->super_for_commit, log_root_level);
        ret = write_all_supers(fs_info, 1);