ext4: prevent a fs with errors from being resized
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>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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 @@
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;