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sheepdog: reorganize check for overlapping requests 

Wrap the code that was copied repeatedly in the two functions,
sd_aio_setup and sd_aio_complete.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20161129113245.32724-6-pbonzini@redhat.com
Signed-off-by: Jeff Cody <jcody@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-11-29 12:32:45 +01:00 committed by Jeff Cody
parent c4080e9391
commit acf6e5f096
1 changed files with 30 additions and 36 deletions
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66
block/sheepdog.c
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@ -479,6 +479,19 @@ static inline AIOReq *alloc_aio_req(BDRVSheepdogState *s, SheepdogAIOCB *acb,
return aio_req;
}
static void wait_for_overlapping_aiocb(BDRVSheepdogState *s, SheepdogAIOCB *acb)
{
SheepdogAIOCB *cb;
retry:
QLIST_FOREACH(cb, &s->inflight_aiocb_head, aiocb_siblings) {
if (AIOCBOverlapping(acb, cb)) {
qemu_co_queue_wait(&s->overlapping_queue);
goto retry;
}
}
}
static void sd_aio_setup(SheepdogAIOCB *acb, BDRVSheepdogState *s,
QEMUIOVector *qiov, int64_t sector_num, int nb_sectors,
int type)
@ -505,6 +518,13 @@ static void sd_aio_setup(SheepdogAIOCB *acb, BDRVSheepdogState *s,
acb->min_dirty_data_idx = UINT32_MAX;
acb->max_dirty_data_idx = 0;
acb->aiocb_type = type;
if (type == AIOCB_FLUSH_CACHE) {
return;
}
wait_for_overlapping_aiocb(s, acb);
QLIST_INSERT_HEAD(&s->inflight_aiocb_head, acb, aiocb_siblings);
}
/* Return -EIO in case of error, file descriptor on success */
@ -2189,18 +2209,14 @@ static void coroutine_fn sd_co_rw_vector(SheepdogAIOCB *acb)
}
}
static bool check_overlapping_aiocb(BDRVSheepdogState *s, SheepdogAIOCB *aiocb)
static void sd_aio_complete(SheepdogAIOCB *acb)
{
SheepdogAIOCB *cb;
QLIST_FOREACH(cb, &s->inflight_aiocb_head, aiocb_siblings) {
if (AIOCBOverlapping(aiocb, cb)) {
return true;
}
if (acb->aiocb_type == AIOCB_FLUSH_CACHE) {
return;
}
QLIST_INSERT_HEAD(&s->inflight_aiocb_head, aiocb, aiocb_siblings);
return false;
QLIST_REMOVE(acb, aiocb_siblings);
qemu_co_queue_restart_all(&acb->s->overlapping_queue);
}
static coroutine_fn int sd_co_writev(BlockDriverState *bs, int64_t sector_num,
@ -2219,18 +2235,10 @@ static coroutine_fn int sd_co_writev(BlockDriverState *bs, int64_t sector_num,
}
sd_aio_setup(&acb, s, qiov, sector_num, nb_sectors, AIOCB_WRITE_UDATA);
retry:
if (check_overlapping_aiocb(s, &acb)) {
qemu_co_queue_wait(&s->overlapping_queue);
goto retry;
}
sd_co_rw_vector(&acb);
sd_write_done(&acb);
sd_aio_complete(&acb);
QLIST_REMOVE(&acb, aiocb_siblings);
qemu_co_queue_restart_all(&s->overlapping_queue);
return acb.ret;
}
@ -2241,17 +2249,9 @@ static coroutine_fn int sd_co_readv(BlockDriverState *bs, int64_t sector_num,
BDRVSheepdogState *s = bs->opaque;
sd_aio_setup(&acb, s, qiov, sector_num, nb_sectors, AIOCB_READ_UDATA);
retry:
if (check_overlapping_aiocb(s, &acb)) {
qemu_co_queue_wait(&s->overlapping_queue);
goto retry;
}
sd_co_rw_vector(&acb);
sd_aio_complete(&acb);
QLIST_REMOVE(&acb, aiocb_siblings);
qemu_co_queue_restart_all(&s->overlapping_queue);
return acb.ret;
}
@ -2275,6 +2275,8 @@ static int coroutine_fn sd_co_flush_to_disk(BlockDriverState *bs)
if (--acb.nr_pending) {
qemu_coroutine_yield();
}
sd_aio_complete(&acb);
return acb.ret;
}
@ -2730,17 +2732,9 @@ static coroutine_fn int sd_co_pdiscard(BlockDriverState *bs, int64_t offset,
}
sd_aio_setup(&acb, s, &discard_iov, offset >> BDRV_SECTOR_BITS,
count >> BDRV_SECTOR_BITS, AIOCB_DISCARD_OBJ);
retry:
if (check_overlapping_aiocb(s, &acb)) {
qemu_co_queue_wait(&s->overlapping_queue);
goto retry;
}
sd_co_rw_vector(&acb);
sd_aio_complete(&acb);
QLIST_REMOVE(&acb, aiocb_siblings);
qemu_co_queue_restart_all(&s->overlapping_queue);
return acb.ret;
}