| Message ID | 20210519025529.707897-4-damien.lemoal@wdc.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | dm: Improve zoned block device support | expand |
On Wed, May 19, 2021 at 11:55:21AM +0900, Damien Le Moal wrote: > Introduce the BIO flag BIO_ZONE_WRITE_LOCKED to indicate that a BIO owns > the write lock of the zone it is targeting. This is the counterpart of > the struct request flag RQF_ZONE_WRITE_LOCKED. This new BIO flag is > reserved for now for zone write locking control for device mapper > targets exposing a zoned block device. So normally we try to use a REQ_* flag instead of duplicate BIO_ and RQF ones. But I think this is a special case as the flag never gets propagated. Can you document that in the commit log? With that: Reviewed-by: Christoph Hellwig <hch@lst.de>
On 2021/05/19 18:42, Christoph Hellwig wrote: > On Wed, May 19, 2021 at 11:55:21AM +0900, Damien Le Moal wrote: >> Introduce the BIO flag BIO_ZONE_WRITE_LOCKED to indicate that a BIO owns >> the write lock of the zone it is targeting. This is the counterpart of >> the struct request flag RQF_ZONE_WRITE_LOCKED. This new BIO flag is >> reserved for now for zone write locking control for device mapper >> targets exposing a zoned block device. > > So normally we try to use a REQ_* flag instead of duplicate BIO_ and > RQF ones. But I think this is a special case as the flag never gets > propagated. Can you document that in the commit log? Will do. > > With that: > > Reviewed-by: Christoph Hellwig <hch@lst.de> >
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index db026b6ec15a..e5cf12f102a2 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -304,6 +304,7 @@ enum { BIO_CGROUP_ACCT, /* has been accounted to a cgroup */ BIO_TRACKED, /* set if bio goes through the rq_qos path */ BIO_REMAPPED, + BIO_ZONE_WRITE_LOCKED, /* Owns a zoned device zone write lock */ BIO_FLAG_LAST };
Introduce the BIO flag BIO_ZONE_WRITE_LOCKED to indicate that a BIO owns the write lock of the zone it is targeting. This is the counterpart of the struct request flag RQF_ZONE_WRITE_LOCKED. This new BIO flag is reserved for now for zone write locking control for device mapper targets exposing a zoned block device. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> --- include/linux/blk_types.h | 1 + 1 file changed, 1 insertion(+)