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

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Date:	Sat, 10 Feb 2007 23:44:01 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org
Subject: [PATCH] FAT: DIO-write fallback to normal buffered

[RESEND: forget to add linux-kernel@...r.kernel.org]

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@...l.parknet.co.jp>
---

 fs/fat/inode.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff -puN fs/fat/inode.c~fat_direct-io-fallback fs/fat/inode.c
--- linux-2.6/fs/fat/inode.c~fat_direct-io-fallback	2007-02-10 22:08:33.000000000 +0900
+++ linux-2.6-hirofumi/fs/fat/inode.c	2007-02-10 22:08:33.000000000 +0900
@@ -173,10 +173,12 @@ static ssize_t fat_direct_IO(int rw, str
 		 *
 		 * 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;
 	}
 
 	/*
_
-
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