On Thu, Sep 08, 2011 at 10:26:51AM +0800, Li Zefan wrote:
> To reproduce the bug:
>
> # mount -o nodatacow /dev/sda7 /mnt/
> # dd if=/dev/zero of=/mnt/tmp bs=4K count=1
> 1+0 records in
> 1+0 records out
> 4096 bytes (4.1 kB) copied, 0.000136115 s, 30.1 MB/s
> # dd if=/dev/zero of=/mnt/tmp bs=4K count=1 conv=notrunc oflag=direct
> dd: writing `/mnt/tmp': Input/output error
> 1+0 records in
> 0+0 records out
>
> btrfs_ordered_update_i_size() may return 1, but btrfs_endio_direct_write()
> mistakenly takes it as an error.
>
> Signed-off-by: Li Zefan <l...@cn.fujitsu.com>
Reviewed-by: David Sterba <dste...@suse.cz>
> ---
> fs/btrfs/inode.c | 3 +--
> 1 files changed, 1 insertions(+), 2 deletions(-)
>
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index 0ccc743..3bd35fe 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -5785,8 +5785,7 @@ again:
> if (test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags)) {
> ret = btrfs_ordered_update_i_size(inode, 0, ordered);
> if (!ret)
> - ret = btrfs_update_inode(trans, root, inode);
> - err = ret;
> + err = btrfs_update_inode(trans, root, inode);
> goto out;
> }
>
> -- 1.7.3.1
> --
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