Christoph Hellwig <h...@lst.de> writes:
> Since the big barrier rewrite/removal in 2007 we never fail FLUSH or
> FUA requests, which means we can remove the magic BIO_EOPNOTSUPP flag
> to help propagating those to the buffer_head layer.
I had a look through the kernel, checking for places where maybe we were
relying on an EOPNOTSUPP from REQ_DISCARD, just to ensure you weren't
pulling out an error path that could still be used. I think everything
checks out.
> diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
> index 992ef58..c2ee937 100644
> --- a/include/linux/blk_types.h
> +++ b/include/linux/blk_types.h
> @@ -118,7 +118,6 @@ struct bio {
> #define BIO_CLONED 4 /* doesn't own data */
> #define BIO_BOUNCED 5 /* bio is a bounce bio */
> #define BIO_USER_MAPPED 6 /* contains user pages */
> -#define BIO_EOPNOTSUPP 7 /* not supported */
> #define BIO_NULL_MAPPED 8 /* contains invalid user pages */
> #define BIO_QUIET 9 /* Make BIO Quiet */
> #define BIO_SNAP_STABLE 10 /* bio data must be snapshotted during
> write */
Should we leave a hole in the numbering scheme?
Reviewed-by: Jeff Moyer <jmo...@redhat.com>
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