[Drbd-dev] [PATCH 1/8] drbd: drop REQ_OP_WRITE_SAME support
Christoph Hellwig
hch at lst.de
Wed Apr 12 10:48:02 CEST 2017
Linux only used it for zeroing, for which we have better methods now.
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
drivers/block/drbd/drbd_main.c | 28 ++----------------
drivers/block/drbd/drbd_nl.c | 60 --------------------------------------
drivers/block/drbd/drbd_receiver.c | 38 +++---------------------
drivers/block/drbd/drbd_req.c | 1 -
drivers/block/drbd/drbd_worker.c | 4 ---
5 files changed, 7 insertions(+), 124 deletions(-)
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 84455c365f57..183468e0b959 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -931,7 +931,7 @@ void assign_p_sizes_qlim(struct drbd_device *device, struct p_sizes *p, struct r
p->qlim->io_min = cpu_to_be32(queue_io_min(q));
p->qlim->io_opt = cpu_to_be32(queue_io_opt(q));
p->qlim->discard_enabled = blk_queue_discard(q);
- p->qlim->write_same_capable = !!q->limits.max_write_same_sectors;
+ p->qlim->write_same_capable = 0;
} else {
q = device->rq_queue;
p->qlim->physical_block_size = cpu_to_be32(queue_physical_block_size(q));
@@ -1610,9 +1610,6 @@ static int _drbd_send_bio(struct drbd_peer_device *peer_device, struct bio *bio)
? 0 : MSG_MORE);
if (err)
return err;
- /* REQ_OP_WRITE_SAME has only one segment */
- if (bio_op(bio) == REQ_OP_WRITE_SAME)
- break;
}
return 0;
}
@@ -1631,9 +1628,6 @@ static int _drbd_send_zc_bio(struct drbd_peer_device *peer_device, struct bio *b
bio_iter_last(bvec, iter) ? 0 : MSG_MORE);
if (err)
return err;
- /* REQ_OP_WRITE_SAME has only one segment */
- if (bio_op(bio) == REQ_OP_WRITE_SAME)
- break;
}
return 0;
}
@@ -1665,7 +1659,6 @@ static u32 bio_flags_to_wire(struct drbd_connection *connection,
return (bio->bi_opf & REQ_SYNC ? DP_RW_SYNC : 0) |
(bio->bi_opf & REQ_FUA ? DP_FUA : 0) |
(bio->bi_opf & REQ_PREFLUSH ? DP_FLUSH : 0) |
- (bio_op(bio) == REQ_OP_WRITE_SAME ? DP_WSAME : 0) |
(bio_op(bio) == REQ_OP_DISCARD ? DP_DISCARD : 0) |
(bio_op(bio) == REQ_OP_WRITE_ZEROES ? DP_DISCARD : 0);
else
@@ -1680,7 +1673,6 @@ int drbd_send_dblock(struct drbd_peer_device *peer_device, struct drbd_request *
struct drbd_device *device = peer_device->device;
struct drbd_socket *sock;
struct p_data *p;
- struct p_wsame *wsame = NULL;
void *digest_out;
unsigned int dp_flags = 0;
int digest_size;
@@ -1717,27 +1709,13 @@ int drbd_send_dblock(struct drbd_peer_device *peer_device, struct drbd_request *
err = __send_command(peer_device->connection, device->vnr, sock, P_TRIM, sizeof(*t), NULL, 0);
goto out;
}
- if (dp_flags & DP_WSAME) {
- /* this will only work if DRBD_FF_WSAME is set AND the
- * handshake agreed that all nodes and backend devices are
- * WRITE_SAME capable and agree on logical_block_size */
- wsame = (struct p_wsame*)p;
- digest_out = wsame + 1;
- wsame->size = cpu_to_be32(req->i.size);
- } else
- digest_out = p + 1;
+ digest_out = p + 1;
/* our digest is still only over the payload.
* TRIM does not carry any payload. */
if (digest_size)
drbd_csum_bio(peer_device->connection->integrity_tfm, req->master_bio, digest_out);
- if (wsame) {
- err =
- __send_command(peer_device->connection, device->vnr, sock, P_WSAME,
- sizeof(*wsame) + digest_size, NULL,
- bio_iovec(req->master_bio).bv_len);
- } else
- err =
+ err =
__send_command(peer_device->connection, device->vnr, sock, P_DATA,
sizeof(*p) + digest_size, NULL, req->i.size);
if (!err) {
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 02255a0d68b9..53aeed040eb4 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -1234,65 +1234,6 @@ static void fixup_discard_if_not_supported(struct request_queue *q)
}
}
-static void decide_on_write_same_support(struct drbd_device *device,
- struct request_queue *q,
- struct request_queue *b, struct o_qlim *o)
-{
- struct drbd_peer_device *peer_device = first_peer_device(device);
- struct drbd_connection *connection = peer_device->connection;
- bool can_do = b ? b->limits.max_write_same_sectors : true;
-
- if (can_do && connection->cstate >= C_CONNECTED && !(connection->agreed_features & DRBD_FF_WSAME)) {
- can_do = false;
- drbd_info(peer_device, "peer does not support WRITE_SAME\n");
- }
-
- if (o) {
- /* logical block size; queue_logical_block_size(NULL) is 512 */
- unsigned int peer_lbs = be32_to_cpu(o->logical_block_size);
- unsigned int me_lbs_b = queue_logical_block_size(b);
- unsigned int me_lbs = queue_logical_block_size(q);
-
- if (me_lbs_b != me_lbs) {
- drbd_warn(device,
- "logical block size of local backend does not match (drbd:%u, backend:%u); was this a late attach?\n",
- me_lbs, me_lbs_b);
- /* rather disable write same than trigger some BUG_ON later in the scsi layer. */
- can_do = false;
- }
- if (me_lbs_b != peer_lbs) {
- drbd_warn(peer_device, "logical block sizes do not match (me:%u, peer:%u); this may cause problems.\n",
- me_lbs, peer_lbs);
- if (can_do) {
- drbd_dbg(peer_device, "logical block size mismatch: WRITE_SAME disabled.\n");
- can_do = false;
- }
- me_lbs = max(me_lbs, me_lbs_b);
- /* We cannot change the logical block size of an in-use queue.
- * We can only hope that access happens to be properly aligned.
- * If not, the peer will likely produce an IO error, and detach. */
- if (peer_lbs > me_lbs) {
- if (device->state.role != R_PRIMARY) {
- blk_queue_logical_block_size(q, peer_lbs);
- drbd_warn(peer_device, "logical block size set to %u\n", peer_lbs);
- } else {
- drbd_warn(peer_device,
- "current Primary must NOT adjust logical block size (%u -> %u); hope for the best.\n",
- me_lbs, peer_lbs);
- }
- }
- }
- if (can_do && !o->write_same_capable) {
- /* If we introduce an open-coded write-same loop on the receiving side,
- * the peer would present itself as "capable". */
- drbd_dbg(peer_device, "WRITE_SAME disabled (peer device not capable)\n");
- can_do = false;
- }
- }
-
- blk_queue_max_write_same_sectors(q, can_do ? DRBD_MAX_BBIO_SECTORS : 0);
-}
-
static void drbd_setup_queue_param(struct drbd_device *device, struct drbd_backing_dev *bdev,
unsigned int max_bio_size, struct o_qlim *o)
{
@@ -1321,7 +1262,6 @@ static void drbd_setup_queue_param(struct drbd_device *device, struct drbd_backi
blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
blk_queue_segment_boundary(q, PAGE_SIZE-1);
decide_on_discard_support(device, q, b, discard_zeroes_if_aligned);
- decide_on_write_same_support(device, q, b, o);
if (b) {
blk_queue_stack_limits(q, b);
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 1b0a2be24f39..980d53793007 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -1459,18 +1459,6 @@ static void drbd_issue_peer_discard(struct drbd_device *device, struct drbd_peer
drbd_endio_write_sec_final(peer_req);
}
-static void drbd_issue_peer_wsame(struct drbd_device *device,
- struct drbd_peer_request *peer_req)
-{
- struct block_device *bdev = device->ldev->backing_bdev;
- sector_t s = peer_req->i.sector;
- sector_t nr = peer_req->i.size >> 9;
- if (blkdev_issue_write_same(bdev, s, nr, GFP_NOIO, peer_req->pages))
- peer_req->flags |= EE_WAS_ERROR;
- drbd_endio_write_sec_final(peer_req);
-}
-
-
/**
* drbd_submit_peer_request()
* @device: DRBD device.
@@ -1508,7 +1496,7 @@ int drbd_submit_peer_request(struct drbd_device *device,
* Correctness first, performance later. Next step is to code an
* asynchronous variant of the same.
*/
- if (peer_req->flags & (EE_IS_TRIM|EE_WRITE_SAME)) {
+ if (peer_req->flags & EE_IS_TRIM) {
/* wait for all pending IO completions, before we start
* zeroing things out. */
conn_wait_active_ee_empty(peer_req->peer_device->connection);
@@ -1527,8 +1515,6 @@ int drbd_submit_peer_request(struct drbd_device *device,
if (peer_req->flags & EE_IS_TRIM)
drbd_issue_peer_discard(device, peer_req);
- else /* EE_WRITE_SAME */
- drbd_issue_peer_wsame(device, peer_req);
return 0;
}
@@ -1723,7 +1709,6 @@ read_in_block(struct drbd_peer_device *peer_device, u64 id, sector_t sector,
void *dig_vv = peer_device->connection->int_dig_vv;
unsigned long *data;
struct p_trim *trim = (pi->cmd == P_TRIM) ? pi->data : NULL;
- struct p_trim *wsame = (pi->cmd == P_WSAME) ? pi->data : NULL;
digest_size = 0;
if (!trim && peer_device->connection->peer_integrity_tfm) {
@@ -1738,29 +1723,17 @@ read_in_block(struct drbd_peer_device *peer_device, u64 id, sector_t sector,
data_size -= digest_size;
}
- /* assume request_size == data_size, but special case trim and wsame. */
+ /* assume request_size == data_size, but special case trim. */
ds = data_size;
if (trim) {
if (!expect(data_size == 0))
return NULL;
ds = be32_to_cpu(trim->size);
- } else if (wsame) {
- if (data_size != queue_logical_block_size(device->rq_queue)) {
- drbd_err(peer_device, "data size (%u) != drbd logical block size (%u)\n",
- data_size, queue_logical_block_size(device->rq_queue));
- return NULL;
- }
- if (data_size != bdev_logical_block_size(device->ldev->backing_bdev)) {
- drbd_err(peer_device, "data size (%u) != backend logical block size (%u)\n",
- data_size, bdev_logical_block_size(device->ldev->backing_bdev));
- return NULL;
- }
- ds = be32_to_cpu(wsame->size);
}
if (!expect(IS_ALIGNED(ds, 512)))
return NULL;
- if (trim || wsame) {
+ if (trim) {
if (!expect(ds <= (DRBD_MAX_BBIO_SECTORS << 9)))
return NULL;
} else if (!expect(ds <= DRBD_MAX_BIO_SIZE))
@@ -1788,8 +1761,6 @@ read_in_block(struct drbd_peer_device *peer_device, u64 id, sector_t sector,
peer_req->flags |= EE_IS_TRIM;
return peer_req;
}
- if (wsame)
- peer_req->flags |= EE_WRITE_SAME;
/* receive payload size bytes into page chain */
ds = data_size;
@@ -2545,7 +2516,7 @@ static int receive_Data(struct drbd_connection *connection, struct packet_info *
* we wait for all pending requests, respectively wait for
* active_ee to become empty in drbd_submit_peer_request();
* better not add ourselves here. */
- if ((peer_req->flags & (EE_IS_TRIM|EE_WRITE_SAME)) == 0)
+ if ((peer_req->flags & EE_IS_TRIM) == 0)
list_add_tail(&peer_req->w.list, &device->active_ee);
spin_unlock_irq(&device->resource->req_lock);
@@ -4869,7 +4840,6 @@ static struct data_cmd drbd_cmd_handler[] = {
[P_PROTOCOL_UPDATE] = { 1, sizeof(struct p_protocol), receive_protocol },
[P_TRIM] = { 0, sizeof(struct p_trim), receive_Data },
[P_RS_DEALLOCATED] = { 0, sizeof(struct p_block_desc), receive_rs_deallocated },
- [P_WSAME] = { 1, sizeof(struct p_wsame), receive_Data },
};
static void drbdd(struct drbd_connection *connection)
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index b5730e17b455..3d3fba937a92 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -58,7 +58,6 @@ static struct drbd_request *drbd_req_new(struct drbd_device *device, struct bio
drbd_req_make_private_bio(req, bio_src);
req->rq_state = (bio_data_dir(bio_src) == WRITE ? RQ_WRITE : 0)
- | (bio_op(bio_src) == REQ_OP_WRITE_SAME ? RQ_WSAME : 0)
| (bio_op(bio_src) == REQ_OP_WRITE_ZEROES ? RQ_UNMAP : 0)
| (bio_op(bio_src) == REQ_OP_DISCARD ? RQ_UNMAP : 0);
req->device = device;
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index 1afcb4e02d8d..9fad03491250 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -330,10 +330,6 @@ void drbd_csum_bio(struct crypto_ahash *tfm, struct bio *bio, void *digest)
sg_set_page(&sg, bvec.bv_page, bvec.bv_len, bvec.bv_offset);
ahash_request_set_crypt(req, &sg, NULL, sg.length);
crypto_ahash_update(req);
- /* REQ_OP_WRITE_SAME has only one segment,
- * checksum the payload only once. */
- if (bio_op(bio) == REQ_OP_WRITE_SAME)
- break;
}
ahash_request_set_crypt(req, NULL, digest, 0);
crypto_ahash_final(req);
--
2.11.0
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