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drbd: Add read_requests tree 

We do not do collision detection for read requests, but we still need to
look up the request objects when we receive a package over the network.
Using the same data structure for read and write requests results in
simpler code once the tl_hash and app_reads_hash tables are removed.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Andreas Gruenbacher 2011-01-21 17:18:39 +01:00 committed by Philipp Reisner
parent de696716e8
commit dac1389ccc
3 changed files with 13 additions and 4 deletions
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3
drivers/block/drbd/drbd_int.h
View File

@ -1019,7 +1019,8 @@ struct drbd_conf {
struct hlist_head *tl_hash;
unsigned int tl_hash_s;
/* Interval tree of pending local write requests */
/* Interval tree of pending local requests */
struct rb_root read_requests;
struct rb_root write_requests;
/* blocks to resync in this run [unit BM_BLOCK_SIZE] */

1
drivers/block/drbd/drbd_main.c
View File

@ -3473,6 +3473,7 @@ struct drbd_conf *drbd_new_device(unsigned int minor)
/* no need to lock access, we are still initializing this minor device. */
if (!tl_init(mdev))
goto out_no_tl;
mdev->read_requests = RB_ROOT;
mdev->write_requests = RB_ROOT;
mdev->app_reads_hash = kzalloc(APP_R_HSIZE*sizeof(void *), GFP_KERNEL);

13
drivers/block/drbd/drbd_req.c
View File

@ -260,10 +260,15 @@ void _req_may_be_done(struct drbd_request *req, struct bio_and_error *m)
/* remove the request from the conflict detection
* respective block_id verification hash */
if (!hlist_unhashed(&req->collision)) {
if (!drbd_interval_empty(&req->i)) {
struct rb_root *root;
hlist_del(&req->collision);
if (!drbd_interval_empty(&req->i))
drbd_remove_interval(&mdev->write_requests, &req->i);
if (rw == WRITE)
root = &mdev->write_requests;
else
root = &mdev->read_requests;
drbd_remove_interval(root, &req->i);
} else
D_ASSERT((s & (RQ_NET_MASK & ~RQ_NET_DONE)) == 0);
@ -332,6 +337,7 @@ static int _req_conflicts(struct drbd_request *req)
struct hlist_head *slot;
D_ASSERT(hlist_unhashed(&req->collision));
D_ASSERT(drbd_interval_empty(&req->i));
if (!get_net_conf(mdev))
return 0;
@ -493,6 +499,7 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
/* so we can verify the handle in the answer packet
* corresponding hlist_del is in _req_may_be_done() */
hlist_add_head(&req->collision, ar_hash_slot(mdev, req->i.sector));
drbd_insert_interval(&mdev->read_requests, &req->i);
set_bit(UNPLUG_REMOTE, &mdev->flags);