86 lines
2 KiB
C
86 lines
2 KiB
C
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/*
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* reqlist API
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*
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* Copyright (C) 2013 Proxmox Server Solutions
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* Copyright (c) 2021 Virtuozzo International GmbH.
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*
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* Authors:
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* Dietmar Maurer (dietmar@proxmox.com)
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* Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/range.h"
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#include "block/reqlist.h"
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void reqlist_init_req(BlockReqList *reqs, BlockReq *req, int64_t offset,
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int64_t bytes)
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{
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assert(!reqlist_find_conflict(reqs, offset, bytes));
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*req = (BlockReq) {
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.offset = offset,
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.bytes = bytes,
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};
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qemu_co_queue_init(&req->wait_queue);
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QLIST_INSERT_HEAD(reqs, req, list);
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}
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BlockReq *reqlist_find_conflict(BlockReqList *reqs, int64_t offset,
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int64_t bytes)
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{
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BlockReq *r;
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QLIST_FOREACH(r, reqs, list) {
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if (ranges_overlap(offset, bytes, r->offset, r->bytes)) {
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return r;
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}
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}
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return NULL;
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}
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bool coroutine_fn reqlist_wait_one(BlockReqList *reqs, int64_t offset,
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int64_t bytes, CoMutex *lock)
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{
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BlockReq *r = reqlist_find_conflict(reqs, offset, bytes);
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if (!r) {
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return false;
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}
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qemu_co_queue_wait(&r->wait_queue, lock);
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return true;
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}
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void coroutine_fn reqlist_wait_all(BlockReqList *reqs, int64_t offset,
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int64_t bytes, CoMutex *lock)
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{
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while (reqlist_wait_one(reqs, offset, bytes, lock)) {
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/* continue */
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}
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}
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void coroutine_fn reqlist_shrink_req(BlockReq *req, int64_t new_bytes)
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{
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if (new_bytes == req->bytes) {
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return;
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}
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assert(new_bytes > 0 && new_bytes < req->bytes);
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req->bytes = new_bytes;
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qemu_co_queue_restart_all(&req->wait_queue);
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}
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void coroutine_fn reqlist_remove_req(BlockReq *req)
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{
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QLIST_REMOVE(req, list);
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qemu_co_queue_restart_all(&req->wait_queue);
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}
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