we may write a bdev which already mounted by
accidentally, and cause filesystem corrupt, add
a warn log to notice user.
Signed-off-by: Fengnan Chang <changfengnan@xxxxxxxxxxxxx>
---
block/fops.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/block/fops.c b/block/fops.c
index a286bf3325c5..5b679ad48df4 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -563,6 +563,11 @@ static ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
if ((iocb->ki_flags & (IOCB_NOWAIT | IOCB_DIRECT)) == IOCB_NOWAIT)
return -EOPNOTSUPP;
+ if (bdev->bd_super)
+ pr_warn_once("warn:try write bdev %s, which already mount with %s!!\n",
+ bdev->bd_disk->disk_name,
+ bdev->bd_super->s_type->name);
+
size -= iocb->ki_pos;
if (iov_iter_count(from) > size) {
shorted = iov_iter_count(from) - size;
--
2.20.1
