This patch prevents a fs without journal from being resized, because
it is easy to detroy the fs.
Signed-off-by: Yongqiang Yang <xiaoqiangnk@xxxxxxxxx>
---
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 53d9795..33ab40d 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -33,6 +33,16 @@ int ext4_resize_begin(struct super_block *sb)
return -EPERM;
}
+ /*
+ * We are not allowed to do online-resizing on a filesystem without
+ * journal, otherwise, it is easy to destroy the filesystem.
+ */
+ if (!EXT4_SB(sb)->s_journal) {
+ ext4_warning(sb, "There is no journal for 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
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