lkml.org 
[lkml]   [2007]   [Feb]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] FAT: DIO-write fallback to normal buffered
On Sat 10-02-07 23:44:01, OGAWA Hirofumi wrote:
> [RESEND: forget to add linux-kernel@vger.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@mail.parknet.co.jp>
Signed-off-by: Jan Kara <jack@suse.cz>

Just to explain a bit: I think that returning EINVAL is quite unexpected
for users in this case (I actually got a bugreport which turned out to be
this problem) and fallback to buffered IO seems to be a reasonable thing to
do. Probably it's not the cleanest solution but for FAT I think it's good
enough ;).

Honza

> ---
>
> 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;
> }
>
> /*
> _
--
Jan Kara <jack@suse.cz>
SuSE CR Labs
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-02-14 11:55    [W:0.024 / U:2.256 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site