[PATCH 02/12] ext4: prevent a fs with errors from being resized

[Yongqiang Yang <xiaoqiangnk@gmail.com>]

A filesystem with errors is not allowed to being resized, otherwise, it is
easy to destroy the filesystem.

Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
---
 fs/ext4/resize.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 0213f63..53d9795 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -23,6 +23,16 @@ int ext4_resize_begin(struct super_block *sb)
 	if (!capable(CAP_SYS_RESOURCE))
 		return -EPERM;
 
+	/*
+	 * We are not allowed to do online-resizing on a filesystem mounted
+	 * with error, because it can destroy the filesystem easily.
+	 */
+	if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
+		ext4_warning(sb, "There are errors in the filesystem, "
+			     "so online resizing is not allowed\n");
+		return -EPERM;
+	}
+
 	if (test_and_set_bit_lock(EXT4_RESIZING, &EXT4_SB(sb)->s_resize_flags))
 		ret = -EBUSY;
 
-- 
1.7.5.1