84b1e80f67
Let's reuse convenient helper. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Hanna Reitz <hreitz@redhat.com> Message-Id: <20220303194349.2304213-8-vsementsov@virtuozzo.com> Signed-off-by: Hanna Reitz <hreitz@redhat.com>
78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
/*
|
|
* reqlist API
|
|
*
|
|
* Copyright (C) 2013 Proxmox Server Solutions
|
|
* Copyright (c) 2021 Virtuozzo International GmbH.
|
|
*
|
|
* Authors:
|
|
* Dietmar Maurer (dietmar@proxmox.com)
|
|
* Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "qemu/range.h"
|
|
|
|
#include "block/reqlist.h"
|
|
|
|
void reqlist_init_req(BlockReqList *reqs, BlockReq *req, int64_t offset,
|
|
int64_t bytes)
|
|
{
|
|
assert(!reqlist_find_conflict(reqs, offset, bytes));
|
|
|
|
*req = (BlockReq) {
|
|
.offset = offset,
|
|
.bytes = bytes,
|
|
};
|
|
qemu_co_queue_init(&req->wait_queue);
|
|
QLIST_INSERT_HEAD(reqs, req, list);
|
|
}
|
|
|
|
BlockReq *reqlist_find_conflict(BlockReqList *reqs, int64_t offset,
|
|
int64_t bytes)
|
|
{
|
|
BlockReq *r;
|
|
|
|
QLIST_FOREACH(r, reqs, list) {
|
|
if (ranges_overlap(offset, bytes, r->offset, r->bytes)) {
|
|
return r;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
bool coroutine_fn reqlist_wait_one(BlockReqList *reqs, int64_t offset,
|
|
int64_t bytes, CoMutex *lock)
|
|
{
|
|
BlockReq *r = reqlist_find_conflict(reqs, offset, bytes);
|
|
|
|
if (!r) {
|
|
return false;
|
|
}
|
|
|
|
qemu_co_queue_wait(&r->wait_queue, lock);
|
|
|
|
return true;
|
|
}
|
|
|
|
void coroutine_fn reqlist_shrink_req(BlockReq *req, int64_t new_bytes)
|
|
{
|
|
if (new_bytes == req->bytes) {
|
|
return;
|
|
}
|
|
|
|
assert(new_bytes > 0 && new_bytes < req->bytes);
|
|
|
|
req->bytes = new_bytes;
|
|
qemu_co_queue_restart_all(&req->wait_queue);
|
|
}
|
|
|
|
void coroutine_fn reqlist_remove_req(BlockReq *req)
|
|
{
|
|
QLIST_REMOVE(req, list);
|
|
qemu_co_queue_restart_all(&req->wait_queue);
|
|
}
|