161 lines
4.3 KiB
C
Executable File
161 lines
4.3 KiB
C
Executable File
/*
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* Block protocol for record/replay
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*
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* Copyright (c) 2010-2016 Institute for System Programming
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* of the Russian Academy of Sciences.
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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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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "block/block_int.h"
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#include "sysemu/replay.h"
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#include "qapi/error.h"
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typedef struct Request {
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Coroutine *co;
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QEMUBH *bh;
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} Request;
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/* Next request id.
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This counter is global, because requests from different
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block devices should not get overlapping ids. */
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static uint64_t request_id;
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static int blkreplay_open(BlockDriverState *bs, QDict *options, int flags,
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Error **errp)
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{
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Error *local_err = NULL;
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int ret;
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/* Open the image file */
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bs->file = bdrv_open_child(NULL, options, "image",
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bs, &child_file, false, &local_err);
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if (local_err) {
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ret = -EINVAL;
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error_propagate(errp, local_err);
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goto fail;
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}
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ret = 0;
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fail:
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if (ret < 0) {
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bdrv_unref_child(bs, bs->file);
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}
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return ret;
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}
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static void blkreplay_close(BlockDriverState *bs)
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{
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}
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static int64_t blkreplay_getlength(BlockDriverState *bs)
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{
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return bdrv_getlength(bs->file->bs);
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}
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/* This bh is used for synchronization of return from coroutines.
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It continues yielded coroutine which then finishes its execution.
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BH is called adjusted to some replay checkpoint, therefore
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record and replay will always finish coroutines deterministically.
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*/
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static void blkreplay_bh_cb(void *opaque)
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{
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Request *req = opaque;
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qemu_coroutine_enter(req->co, NULL);
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qemu_bh_delete(req->bh);
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g_free(req);
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}
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static void block_request_create(uint64_t reqid, BlockDriverState *bs,
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Coroutine *co)
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{
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Request *req = g_new(Request, 1);
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*req = (Request) {
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.co = co,
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.bh = aio_bh_new(bdrv_get_aio_context(bs), blkreplay_bh_cb, req),
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};
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replay_block_event(req->bh, reqid);
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}
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static int coroutine_fn blkreplay_co_readv(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
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{
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uint64_t reqid = request_id++;
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int ret = bdrv_co_readv(bs->file->bs, sector_num, nb_sectors, qiov);
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block_request_create(reqid, bs, qemu_coroutine_self());
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qemu_coroutine_yield();
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return ret;
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}
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static int coroutine_fn blkreplay_co_writev(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
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{
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uint64_t reqid = request_id++;
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int ret = bdrv_co_writev(bs->file->bs, sector_num, nb_sectors, qiov);
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block_request_create(reqid, bs, qemu_coroutine_self());
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qemu_coroutine_yield();
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return ret;
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}
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static int coroutine_fn blkreplay_co_write_zeroes(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors, BdrvRequestFlags flags)
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{
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uint64_t reqid = request_id++;
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int ret = bdrv_co_write_zeroes(bs->file->bs, sector_num, nb_sectors, flags);
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block_request_create(reqid, bs, qemu_coroutine_self());
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qemu_coroutine_yield();
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return ret;
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}
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static int coroutine_fn blkreplay_co_discard(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors)
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{
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uint64_t reqid = request_id++;
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int ret = bdrv_co_discard(bs->file->bs, sector_num, nb_sectors);
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block_request_create(reqid, bs, qemu_coroutine_self());
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qemu_coroutine_yield();
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return ret;
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}
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static int coroutine_fn blkreplay_co_flush(BlockDriverState *bs)
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{
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uint64_t reqid = request_id++;
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int ret = bdrv_co_flush(bs->file->bs);
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block_request_create(reqid, bs, qemu_coroutine_self());
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qemu_coroutine_yield();
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return ret;
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}
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static BlockDriver bdrv_blkreplay = {
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.format_name = "blkreplay",
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.protocol_name = "blkreplay",
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.instance_size = 0,
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.bdrv_file_open = blkreplay_open,
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.bdrv_close = blkreplay_close,
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.bdrv_getlength = blkreplay_getlength,
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.bdrv_co_readv = blkreplay_co_readv,
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.bdrv_co_writev = blkreplay_co_writev,
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.bdrv_co_write_zeroes = blkreplay_co_write_zeroes,
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.bdrv_co_discard = blkreplay_co_discard,
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.bdrv_co_flush = blkreplay_co_flush,
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};
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static void bdrv_blkreplay_init(void)
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{
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bdrv_register(&bdrv_blkreplay);
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}
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block_init(bdrv_blkreplay_init);
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