[PATCH] FAT: DIO-write fallback to normal buffered

If the DIO write on FAT is expanding the size, it will be fail by -EINVAL,
because FAT can't handle it now.

This patch fallback it to the normal buffered-write and would return
success.

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 761073544217..9bfe607c892e 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -173,10 +173,12 @@ static ssize_t fat_direct_IO(int rw, struct kiocb *iocb,
                  *
                  * But we must fill the remaining area or hole by nul for
                  * updating ->mmu_private.
+                 *
+                 * Return 0, and fallback to normal buffered write.
                  */
                 loff_t size = offset + iov_length(iov, nr_segs);
                 if (MSDOS_I(inode)->mmu_private < size)
-                        return -EINVAL;
+                        return 0;
         }
 
         /*