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authorTejun Heo <tj@kernel.org>2009-05-08 11:54:06 +0900
committerJens Axboe <jens.axboe@oracle.com>2009-05-11 09:52:16 +0200
commitb12d4f82c1a3cdcb2441c803a3368a9426f2f47f (patch)
tree043c804960c3192076737411c1a6854f2b49ded9 /drivers/block
parent2d75ce084eec2a8154225c7e978191b364029003 (diff)
paride: dequeue in-flight request
pd/pf/pcd have track in-flight request by pd/pf/pcd_req. They can be converted to dequeueing model by updating fetching and completion paths. Convert them. Note that removal of elv_next_request() call from pf_next_buf() doesn't make any functional difference. The path is traveled only during partial completion of a request and elv_next_request() call must return the same request anyway. [ Impact: dequeue in-flight request ] Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Tim Waugh <tim@cyberelk.net> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/paride/pcd.c18
-rw-r--r--drivers/block/paride/pd.c14
-rw-r--r--drivers/block/paride/pf.c14
3 files changed, 28 insertions, 18 deletions
diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c
index 2d5dc0af55e4..425f81586a31 100644
--- a/drivers/block/paride/pcd.c
+++ b/drivers/block/paride/pcd.c
@@ -719,9 +719,12 @@ static void do_pcd_request(struct request_queue * q)
if (pcd_busy)
return;
while (1) {
- pcd_req = elv_next_request(q);
- if (!pcd_req)
- return;
+ if (!pcd_req) {
+ pcd_req = elv_next_request(q);
+ if (!pcd_req)
+ return;
+ blkdev_dequeue_request(pcd_req);
+ }
if (rq_data_dir(pcd_req) == READ) {
struct pcd_unit *cd = pcd_req->rq_disk->private_data;
@@ -734,8 +737,10 @@ static void do_pcd_request(struct request_queue * q)
pcd_busy = 1;
ps_set_intr(do_pcd_read, NULL, 0, nice);
return;
- } else
- __blk_end_request_cur(pcd_req, -EIO);
+ } else {
+ __blk_end_request_all(pcd_req, -EIO);
+ pcd_req = NULL;
+ }
}
}
@@ -744,7 +749,8 @@ static inline void next_request(int err)
unsigned long saved_flags;
spin_lock_irqsave(&pcd_lock, saved_flags);
- __blk_end_request_cur(pcd_req, err);
+ if (!__blk_end_request_cur(pcd_req, err))
+ pcd_req = NULL;
pcd_busy = 0;
do_pcd_request(pcd_queue);
spin_unlock_irqrestore(&pcd_lock, saved_flags);
diff --git a/drivers/block/paride/pd.c b/drivers/block/paride/pd.c
index 9ec5d4ac0b64..d2ca3f552061 100644
--- a/drivers/block/paride/pd.c
+++ b/drivers/block/paride/pd.c
@@ -410,11 +410,14 @@ static void run_fsm(void)
pd_claimed = 0;
phase = NULL;
spin_lock_irqsave(&pd_lock, saved_flags);
- __blk_end_request_cur(pd_req,
- res == Ok ? 0 : -EIO);
- pd_req = elv_next_request(pd_queue);
- if (!pd_req)
- stop = 1;
+ if (!__blk_end_request_cur(pd_req,
+ res == Ok ? 0 : -EIO)) {
+ pd_req = elv_next_request(pd_queue);
+ if (!pd_req)
+ stop = 1;
+ else
+ blkdev_dequeue_request(pd_req);
+ }
spin_unlock_irqrestore(&pd_lock, saved_flags);
if (stop)
return;
@@ -706,6 +709,7 @@ static void do_pd_request(struct request_queue * q)
pd_req = elv_next_request(q);
if (!pd_req)
return;
+ blkdev_dequeue_request(pd_req);
schedule_fsm();
}
diff --git a/drivers/block/paride/pf.c b/drivers/block/paride/pf.c
index e88c889aa7f2..d6f7bd84ed39 100644
--- a/drivers/block/paride/pf.c
+++ b/drivers/block/paride/pf.c
@@ -752,10 +752,8 @@ static struct request_queue *pf_queue;
static void pf_end_request(int err)
{
- if (pf_req) {
- __blk_end_request_cur(pf_req, err);
+ if (pf_req && !__blk_end_request_cur(pf_req, err))
pf_req = NULL;
- }
}
static void do_pf_request(struct request_queue * q)
@@ -763,9 +761,12 @@ static void do_pf_request(struct request_queue * q)
if (pf_busy)
return;
repeat:
- pf_req = elv_next_request(q);
- if (!pf_req)
- return;
+ if (!pf_req) {
+ pf_req = elv_next_request(q);
+ if (!pf_req)
+ return;
+ blkdev_dequeue_request(pf_req);
+ }
pf_current = pf_req->rq_disk->private_data;
pf_block = blk_rq_pos(pf_req);
@@ -806,7 +807,6 @@ static int pf_next_buf(void)
if (!pf_count) {
spin_lock_irqsave(&pf_spin_lock, saved_flags);
pf_end_request(0);
- pf_req = elv_next_request(pf_queue);
spin_unlock_irqrestore(&pf_spin_lock, saved_flags);
if (!pf_req)
return 1;