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drbd: Request lookup code cleanup (2)

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Unify the ar_id_to_req() and ack_id_to_req() functions: make both fail
if the consistency check fails.  Move the request lookup code now
duplicated in both functions into its own function.

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 2011-01-20 17:14:26 +01:00 committed by Philipp Reisner
parent 5162458564
commit 668eebc6a1
1 changed files with 27 additions and 28 deletions
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55
drivers/block/drbd/drbd_receiver.c
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@ -1469,22 +1469,37 @@ static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_si
return false;
}
static struct drbd_request *
find_request(struct drbd_conf *mdev,
struct hlist_head *(*hash_slot)(struct drbd_conf *, sector_t),
u64 id, sector_t sector, const char *func)
{
struct hlist_head *slot = hash_slot(mdev, sector);
struct hlist_node *n;
struct drbd_request *req;
hlist_for_each_entry(req, n, slot, collision) {
if ((unsigned long)req != (unsigned long)id)
continue;
if (req->sector != sector) {
dev_err(DEV, "%s: found request %lu but it has "
"wrong sector (%llus versus %llus)\n",
func, (unsigned long)req,
(unsigned long long)req->sector,
(unsigned long long)sector);
break;
}
return req;
}
return NULL;
}
/* when we receive the answer for a read request,
* verify that we actually know about it */
static struct drbd_request *ar_id_to_req(struct drbd_conf *mdev, u64 id,
sector_t sector)
{
struct hlist_head *slot = ar_hash_slot(mdev, sector);
struct hlist_node *n;
struct drbd_request *req;
hlist_for_each_entry(req, n, slot, collision) {
if ((unsigned long)req == (unsigned long)id) {
D_ASSERT(req->sector == sector);
return req;
}
}
return NULL;
return find_request(mdev, ar_hash_slot, id, sector, __func__);
}
static int receive_DataReply(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
@ -4243,23 +4258,7 @@ static int got_IsInSync(struct drbd_conf *mdev, struct p_header80 *h)
static struct drbd_request *ack_id_to_req(struct drbd_conf *mdev, u64 id,
sector_t sector)
{
struct hlist_head *slot = tl_hash_slot(mdev, sector);
struct hlist_node *n;
struct drbd_request *req;
hlist_for_each_entry(req, n, slot, collision) {
if ((unsigned long)req == (unsigned long)id) {
if (req->sector != sector) {
dev_err(DEV, "ack_id_to_req: found req %p but it has "
"wrong sector (%llus versus %llus)\n", req,
(unsigned long long)req->sector,
(unsigned long long)sector);
break;
}
return req;
}
}
return NULL;
return find_request(mdev, tl_hash_slot, id, sector, __func__);
}
static int validate_req_change_req_state(struct drbd_conf *mdev,