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drbd: Adding support for BIO/Request flags: REQ_FUA, REQ_FLUSH and REQ_DISCARD

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Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner 2010-08-25 11:58:05 +02:00
parent 1090c056c5
commit 76d2e7eca8
3 changed files with 34 additions and 22 deletions
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8
drivers/block/drbd/drbd_int.h
View File

@ -374,9 +374,13 @@ union p_header {
*/
/* these defines must not be changed without changing the protocol version */
#define DP_HARDBARRIER 1
#define DP_RW_SYNC 2
#define DP_HARDBARRIER 1 /* depricated */
#define DP_RW_SYNC 2 /* equals REQ_SYNC */
#define DP_MAY_SET_IN_SYNC 4
#define DP_UNPLUG 8 /* equals REQ_UNPLUG */
#define DP_FUA 16 /* equals REQ_FUA */
#define DP_FLUSH 32 /* equals REQ_FLUSH */
#define DP_DISCARD 64 /* equals REQ_DISCARD */
struct p_data {
union p_header head;

28
drivers/block/drbd/drbd_main.c
View File

@ -2426,6 +2426,18 @@ static int _drbd_send_zc_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e)
return 1;
}
static u32 bio_flags_to_wire(struct drbd_conf *mdev, unsigned long bi_rw)
{
if (mdev->agreed_pro_version >= 95)
return (bi_rw & REQ_SYNC ? DP_RW_SYNC : 0) |
(bi_rw & REQ_UNPLUG ? DP_UNPLUG : 0) |
(bi_rw & REQ_FUA ? DP_FUA : 0) |
(bi_rw & REQ_FLUSH ? DP_FLUSH : 0) |
(bi_rw & REQ_DISCARD ? DP_DISCARD : 0);
else
return bi_rw & (REQ_SYNC | REQ_UNPLUG) ? DP_RW_SYNC : 0;
}
/* Used to send write requests
* R_PRIMARY -> Peer (P_DATA)
*/
@ -2459,21 +2471,9 @@ int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req)
p.block_id = (unsigned long)req;
p.seq_num = cpu_to_be32(req->seq_num =
atomic_add_return(1, &mdev->packet_seq));
dp_flags = 0;
/* NOTE: no need to check if barriers supported here as we would
* not pass the test in make_request_common in that case
*/
if (req->master_bio->bi_rw & REQ_HARDBARRIER) {
dev_err(DEV, "ASSERT FAILED would have set DP_HARDBARRIER\n");
/* dp_flags |= DP_HARDBARRIER; */
}
if (req->master_bio->bi_rw & REQ_SYNC)
dp_flags |= DP_RW_SYNC;
/* for now handle SYNCIO and UNPLUG
* as if they still were one and the same flag */
if (req->master_bio->bi_rw & REQ_UNPLUG)
dp_flags |= DP_RW_SYNC;
dp_flags = bio_flags_to_wire(mdev, req->master_bio->bi_rw);
if (mdev->state.conn >= C_SYNC_SOURCE &&
mdev->state.conn <= C_PAUSED_SYNC_T)
dp_flags |= DP_MAY_SET_IN_SYNC;

20
drivers/block/drbd/drbd_receiver.c
View File

@ -1753,6 +1753,18 @@ static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq)
return ret;
}
static unsigned long write_flags_to_bio(struct drbd_conf *mdev, u32 dpf)
{
if (mdev->agreed_pro_version >= 95)
return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) |
(dpf & DP_UNPLUG ? REQ_UNPLUG : 0) |
(dpf & DP_FUA ? REQ_FUA : 0) |
(dpf & DP_FLUSH ? REQ_FUA : 0) |
(dpf & DP_DISCARD ? REQ_DISCARD : 0);
else
return dpf & DP_RW_SYNC ? (REQ_SYNC | REQ_UNPLUG) : 0;
}
/* mirrored write */
static int receive_Data(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
{
@ -1818,12 +1830,8 @@ static int receive_Data(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned
spin_unlock(&mdev->epoch_lock);
dp_flags = be32_to_cpu(p->dp_flags);
if (dp_flags & DP_HARDBARRIER) {
dev_err(DEV, "ASSERT FAILED would have submitted barrier request\n");
/* rw |= REQ_HARDBARRIER; */
}
if (dp_flags & DP_RW_SYNC)
rw |= REQ_SYNC | REQ_UNPLUG;
rw |= write_flags_to_bio(mdev, dp_flags);
if (dp_flags & DP_MAY_SET_IN_SYNC)
e->flags |= EE_MAY_SET_IN_SYNC;