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https://gitlab.com/qemu-project/qemu
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blkverify: Implement bdrv_co_preadv/pwritev/flush
This enables byte granularity requests for blkverify, and at the same time gets us rid of another user of the BDS-level AIO emulation. The reference output of a test case must be changed because the verification failure message reports byte offsets instead of sectors now. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf
parent
7c3a998531
commit
44b6789299
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@ -19,38 +19,36 @@ typedef struct {
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BdrvChild *test_file;
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} BDRVBlkverifyState;
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typedef struct BlkverifyAIOCB BlkverifyAIOCB;
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struct BlkverifyAIOCB {
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BlockAIOCB common;
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typedef struct BlkverifyRequest {
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Coroutine *co;
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BlockDriverState *bs;
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/* Request metadata */
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bool is_write;
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int64_t sector_num;
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int nb_sectors;
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uint64_t offset;
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uint64_t bytes;
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int flags;
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int (*request_fn)(BdrvChild *, int64_t, unsigned int, QEMUIOVector *,
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BdrvRequestFlags);
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int ret; /* test image result */
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int raw_ret; /* raw image result */
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int ret; /* first completed request's result */
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unsigned int done; /* completion counter */
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QEMUIOVector *qiov; /* user I/O vector */
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QEMUIOVector raw_qiov; /* cloned I/O vector for raw file */
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void *buf; /* buffer for raw file I/O */
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QEMUIOVector *raw_qiov; /* cloned I/O vector for raw file */
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} BlkverifyRequest;
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void (*verify)(BlkverifyAIOCB *acb);
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};
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static const AIOCBInfo blkverify_aiocb_info = {
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.aiocb_size = sizeof(BlkverifyAIOCB),
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};
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static void GCC_FMT_ATTR(2, 3) blkverify_err(BlkverifyAIOCB *acb,
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static void GCC_FMT_ATTR(2, 3) blkverify_err(BlkverifyRequest *r,
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const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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fprintf(stderr, "blkverify: %s sector_num=%" PRId64 " nb_sectors=%d ",
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acb->is_write ? "write" : "read", acb->sector_num,
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acb->nb_sectors);
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fprintf(stderr, "blkverify: %s offset=%" PRId64 " bytes=%" PRId64 " ",
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r->is_write ? "write" : "read", r->offset, r->bytes);
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vfprintf(stderr, fmt, ap);
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fprintf(stderr, "\n");
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va_end(ap);
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@ -166,113 +164,106 @@ static int64_t blkverify_getlength(BlockDriverState *bs)
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return bdrv_getlength(s->test_file->bs);
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}
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static BlkverifyAIOCB *blkverify_aio_get(BlockDriverState *bs, bool is_write,
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int64_t sector_num, QEMUIOVector *qiov,
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int nb_sectors,
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BlockCompletionFunc *cb,
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void *opaque)
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static void coroutine_fn blkverify_do_test_req(void *opaque)
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{
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BlkverifyAIOCB *acb = qemu_aio_get(&blkverify_aiocb_info, bs, cb, opaque);
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BlkverifyRequest *r = opaque;
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BDRVBlkverifyState *s = r->bs->opaque;
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acb->is_write = is_write;
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acb->sector_num = sector_num;
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acb->nb_sectors = nb_sectors;
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acb->ret = -EINPROGRESS;
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acb->done = 0;
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acb->qiov = qiov;
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acb->buf = NULL;
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acb->verify = NULL;
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return acb;
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r->ret = r->request_fn(s->test_file, r->offset, r->bytes, r->qiov,
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r->flags);
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r->done++;
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qemu_coroutine_enter_if_inactive(r->co);
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}
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static void blkverify_aio_bh(void *opaque)
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static void coroutine_fn blkverify_do_raw_req(void *opaque)
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{
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BlkverifyAIOCB *acb = opaque;
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BlkverifyRequest *r = opaque;
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if (acb->buf) {
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qemu_iovec_destroy(&acb->raw_qiov);
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qemu_vfree(acb->buf);
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r->raw_ret = r->request_fn(r->bs->file, r->offset, r->bytes, r->raw_qiov,
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r->flags);
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r->done++;
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qemu_coroutine_enter_if_inactive(r->co);
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}
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static int coroutine_fn
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blkverify_co_prwv(BlockDriverState *bs, BlkverifyRequest *r, uint64_t offset,
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uint64_t bytes, QEMUIOVector *qiov, QEMUIOVector *raw_qiov,
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int flags, bool is_write)
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{
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Coroutine *co_a, *co_b;
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*r = (BlkverifyRequest) {
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.co = qemu_coroutine_self(),
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.bs = bs,
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.offset = offset,
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.bytes = bytes,
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.qiov = qiov,
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.raw_qiov = raw_qiov,
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.flags = flags,
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.is_write = is_write,
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.request_fn = is_write ? bdrv_co_pwritev : bdrv_co_preadv,
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};
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co_a = qemu_coroutine_create(blkverify_do_test_req, r);
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co_b = qemu_coroutine_create(blkverify_do_raw_req, r);
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qemu_coroutine_enter(co_a);
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qemu_coroutine_enter(co_b);
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while (r->done < 2) {
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qemu_coroutine_yield();
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}
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acb->common.cb(acb->common.opaque, acb->ret);
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qemu_aio_unref(acb);
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}
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static void blkverify_aio_cb(void *opaque, int ret)
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{
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BlkverifyAIOCB *acb = opaque;
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switch (++acb->done) {
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case 1:
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acb->ret = ret;
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break;
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case 2:
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if (acb->ret != ret) {
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blkverify_err(acb, "return value mismatch %d != %d", acb->ret, ret);
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}
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if (acb->verify) {
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acb->verify(acb);
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}
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aio_bh_schedule_oneshot(bdrv_get_aio_context(acb->common.bs),
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blkverify_aio_bh, acb);
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break;
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if (r->ret != r->raw_ret) {
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blkverify_err(r, "return value mismatch %d != %d", r->ret, r->raw_ret);
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}
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return r->ret;
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}
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static void blkverify_verify_readv(BlkverifyAIOCB *acb)
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static int coroutine_fn
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blkverify_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
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QEMUIOVector *qiov, int flags)
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{
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ssize_t offset = qemu_iovec_compare(acb->qiov, &acb->raw_qiov);
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if (offset != -1) {
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blkverify_err(acb, "contents mismatch in sector %" PRId64,
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acb->sector_num + (int64_t)(offset / BDRV_SECTOR_SIZE));
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BlkverifyRequest r;
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QEMUIOVector raw_qiov;
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void *buf;
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ssize_t cmp_offset;
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int ret;
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buf = qemu_blockalign(bs->file->bs, qiov->size);
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qemu_iovec_init(&raw_qiov, qiov->niov);
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qemu_iovec_clone(&raw_qiov, qiov, buf);
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ret = blkverify_co_prwv(bs, &r, offset, bytes, qiov, &raw_qiov, flags,
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false);
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cmp_offset = qemu_iovec_compare(qiov, &raw_qiov);
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if (cmp_offset != -1) {
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blkverify_err(&r, "contents mismatch at offset %" PRId64,
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offset + cmp_offset);
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}
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qemu_iovec_destroy(&raw_qiov);
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qemu_vfree(buf);
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return ret;
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}
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static BlockAIOCB *blkverify_aio_readv(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockCompletionFunc *cb, void *opaque)
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static int coroutine_fn
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blkverify_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
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QEMUIOVector *qiov, int flags)
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{
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BDRVBlkverifyState *s = bs->opaque;
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BlkverifyAIOCB *acb = blkverify_aio_get(bs, false, sector_num, qiov,
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nb_sectors, cb, opaque);
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acb->verify = blkverify_verify_readv;
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acb->buf = qemu_blockalign(bs->file->bs, qiov->size);
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qemu_iovec_init(&acb->raw_qiov, acb->qiov->niov);
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qemu_iovec_clone(&acb->raw_qiov, qiov, acb->buf);
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bdrv_aio_readv(s->test_file, sector_num, qiov, nb_sectors,
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blkverify_aio_cb, acb);
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bdrv_aio_readv(bs->file, sector_num, &acb->raw_qiov, nb_sectors,
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blkverify_aio_cb, acb);
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return &acb->common;
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BlkverifyRequest r;
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return blkverify_co_prwv(bs, &r, offset, bytes, qiov, qiov, flags, true);
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}
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static BlockAIOCB *blkverify_aio_writev(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockCompletionFunc *cb, void *opaque)
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{
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BDRVBlkverifyState *s = bs->opaque;
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BlkverifyAIOCB *acb = blkverify_aio_get(bs, true, sector_num, qiov,
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nb_sectors, cb, opaque);
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bdrv_aio_writev(s->test_file, sector_num, qiov, nb_sectors,
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blkverify_aio_cb, acb);
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bdrv_aio_writev(bs->file, sector_num, qiov, nb_sectors,
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blkverify_aio_cb, acb);
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return &acb->common;
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}
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static BlockAIOCB *blkverify_aio_flush(BlockDriverState *bs,
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BlockCompletionFunc *cb,
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void *opaque)
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static int blkverify_co_flush(BlockDriverState *bs)
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{
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BDRVBlkverifyState *s = bs->opaque;
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/* Only flush test file, the raw file is not important */
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return bdrv_aio_flush(s->test_file->bs, cb, opaque);
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return bdrv_co_flush(s->test_file->bs);
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}
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static bool blkverify_recurse_is_first_non_filter(BlockDriverState *bs,
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@ -332,9 +323,9 @@ static BlockDriver bdrv_blkverify = {
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.bdrv_getlength = blkverify_getlength,
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.bdrv_refresh_filename = blkverify_refresh_filename,
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.bdrv_aio_readv = blkverify_aio_readv,
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.bdrv_aio_writev = blkverify_aio_writev,
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.bdrv_aio_flush = blkverify_aio_flush,
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.bdrv_co_preadv = blkverify_co_preadv,
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.bdrv_co_pwritev = blkverify_co_pwritev,
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.bdrv_co_flush = blkverify_co_flush,
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.is_filter = true,
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.bdrv_recurse_is_first_non_filter = blkverify_recurse_is_first_non_filter,
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@ -12,7 +12,7 @@ read 512/512 bytes at offset 229376
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 512/512 bytes at offset 0
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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blkverify: read sector_num=0 nb_sectors=1 contents mismatch in sector 0
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blkverify: read offset=0 bytes=512 contents mismatch at offset 0
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=== Testing blkverify through file blockref ===
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@ -26,7 +26,7 @@ read 512/512 bytes at offset 229376
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 512/512 bytes at offset 0
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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blkverify: read sector_num=0 nb_sectors=1 contents mismatch in sector 0
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blkverify: read offset=0 bytes=512 contents mismatch at offset 0
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=== Testing blkdebug through filename ===
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@ -56,7 +56,7 @@ QMP_VERSION
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{"return": {}}
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{"return": {}}
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{"return": {}}
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blkverify: read sector_num=0 nb_sectors=1 contents mismatch in sector 0
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blkverify: read offset=0 bytes=512 contents mismatch at offset 0
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=== Testing blkverify on existing raw block device ===
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@ -66,7 +66,7 @@ QMP_VERSION
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{"return": {}}
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{"return": {}}
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{"return": {}}
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blkverify: read sector_num=0 nb_sectors=1 contents mismatch in sector 0
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blkverify: read offset=0 bytes=512 contents mismatch at offset 0
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=== Testing blkdebug's set-state through QMP ===
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