On Thu, Apr 13, 2017 at 06:11:56PM -0700, Liu Bo wrote:
> With raid1 profile, dio read isn't tolerating IO errors if read length is
> less than the stripe length (64K).
Can you please write more details why this is true? Some pointers to
code etc, I'm lost. Eg. where the errors is tolerated. Thanks.
> This fixes the problem by setting bio's error to 0 if a good copy has been
> found.
>
> Signed-off-by: Liu Bo <bo.li....@oracle.com>
> ---
> fs/btrfs/inode.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index 632b616..4e1398e 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -8113,8 +8113,11 @@ static void btrfs_endio_direct_read(struct bio *bio)
> struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
> int err = bio->bi_error;
>
> - if (dip->flags & BTRFS_DIO_ORIG_BIO_SUBMITTED)
> + if (dip->flags & BTRFS_DIO_ORIG_BIO_SUBMITTED) {
> err = btrfs_subio_endio_read(inode, io_bio, err);
> + if (!err)
> + bio->bi_error = 0;
> + }
>
> unlock_extent(&BTRFS_I(inode)->io_tree, dip->logical_offset,
> dip->logical_offset + dip->bytes - 1);
> --
> 2.5.5
>
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