[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>

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 7610735..9bfe607 100644 (file)
--- 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;
        }
 
        /*