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author | Kevin Wolf <kwolf@redhat.com> | 2016-11-04 21:13:45 +0100 |
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committer | Kevin Wolf <kwolf@redhat.com> | 2017-01-09 13:30:52 +0100 |
commit | 44b6789299a8acca3f25331bc411055cafc7bb06 (patch) | |
tree | 25df981237c8d8dafb9571bd139ec991d32524f6 /block/blkverify.c | |
parent | 7c3a998531da0a77baaa2a6ccb48b8a7b5eb14d5 (diff) | |
download | qemu-44b6789299a8acca3f25331bc411055cafc7bb06.zip qemu-44b6789299a8acca3f25331bc411055cafc7bb06.tar.gz qemu-44b6789299a8acca3f25331bc411055cafc7bb06.tar.bz2 |
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>
Diffstat (limited to 'block/blkverify.c')
-rw-r--r-- | block/blkverify.c | 201 |
1 files changed, 96 insertions, 105 deletions
diff --git a/block/blkverify.c b/block/blkverify.c index 28f9af6..43a940c 100644 --- a/block/blkverify.c +++ b/block/blkverify.c @@ -19,38 +19,36 @@ typedef struct { BdrvChild *test_file; } BDRVBlkverifyState; -typedef struct BlkverifyAIOCB BlkverifyAIOCB; -struct BlkverifyAIOCB { - BlockAIOCB common; +typedef struct BlkverifyRequest { + Coroutine *co; + BlockDriverState *bs; /* Request metadata */ bool is_write; - int64_t sector_num; - int nb_sectors; + uint64_t offset; + uint64_t bytes; + int flags; - int ret; /* first completed request's result */ - unsigned int done; /* completion counter */ + int (*request_fn)(BdrvChild *, int64_t, unsigned int, QEMUIOVector *, + BdrvRequestFlags); - QEMUIOVector *qiov; /* user I/O vector */ - QEMUIOVector raw_qiov; /* cloned I/O vector for raw file */ - void *buf; /* buffer for raw file I/O */ + int ret; /* test image result */ + int raw_ret; /* raw image result */ - void (*verify)(BlkverifyAIOCB *acb); -}; + unsigned int done; /* completion counter */ -static const AIOCBInfo blkverify_aiocb_info = { - .aiocb_size = sizeof(BlkverifyAIOCB), -}; + QEMUIOVector *qiov; /* user I/O vector */ + QEMUIOVector *raw_qiov; /* cloned I/O vector for raw file */ +} BlkverifyRequest; -static void GCC_FMT_ATTR(2, 3) blkverify_err(BlkverifyAIOCB *acb, +static void GCC_FMT_ATTR(2, 3) blkverify_err(BlkverifyRequest *r, const char *fmt, ...) { va_list ap; va_start(ap, fmt); - fprintf(stderr, "blkverify: %s sector_num=%" PRId64 " nb_sectors=%d ", - acb->is_write ? "write" : "read", acb->sector_num, - acb->nb_sectors); + fprintf(stderr, "blkverify: %s offset=%" PRId64 " bytes=%" PRId64 " ", + r->is_write ? "write" : "read", r->offset, r->bytes); vfprintf(stderr, fmt, ap); fprintf(stderr, "\n"); va_end(ap); @@ -166,113 +164,106 @@ static int64_t blkverify_getlength(BlockDriverState *bs) return bdrv_getlength(s->test_file->bs); } -static BlkverifyAIOCB *blkverify_aio_get(BlockDriverState *bs, bool is_write, - int64_t sector_num, QEMUIOVector *qiov, - int nb_sectors, - BlockCompletionFunc *cb, - void *opaque) +static void coroutine_fn blkverify_do_test_req(void *opaque) { - BlkverifyAIOCB *acb = qemu_aio_get(&blkverify_aiocb_info, bs, cb, opaque); - - acb->is_write = is_write; - acb->sector_num = sector_num; - acb->nb_sectors = nb_sectors; - acb->ret = -EINPROGRESS; - acb->done = 0; - acb->qiov = qiov; - acb->buf = NULL; - acb->verify = NULL; - return acb; + BlkverifyRequest *r = opaque; + BDRVBlkverifyState *s = r->bs->opaque; + + r->ret = r->request_fn(s->test_file, r->offset, r->bytes, r->qiov, + r->flags); + r->done++; + qemu_coroutine_enter_if_inactive(r->co); } -static void blkverify_aio_bh(void *opaque) +static void coroutine_fn blkverify_do_raw_req(void *opaque) { - BlkverifyAIOCB *acb = opaque; + BlkverifyRequest *r = opaque; - if (acb->buf) { - qemu_iovec_destroy(&acb->raw_qiov); - qemu_vfree(acb->buf); - } - acb->common.cb(acb->common.opaque, acb->ret); - qemu_aio_unref(acb); + r->raw_ret = r->request_fn(r->bs->file, r->offset, r->bytes, r->raw_qiov, + r->flags); + r->done++; + qemu_coroutine_enter_if_inactive(r->co); } -static void blkverify_aio_cb(void *opaque, int ret) +static int coroutine_fn +blkverify_co_prwv(BlockDriverState *bs, BlkverifyRequest *r, uint64_t offset, + uint64_t bytes, QEMUIOVector *qiov, QEMUIOVector *raw_qiov, + int flags, bool is_write) { - BlkverifyAIOCB *acb = opaque; - - switch (++acb->done) { - case 1: - acb->ret = ret; - break; - - case 2: - if (acb->ret != ret) { - blkverify_err(acb, "return value mismatch %d != %d", acb->ret, ret); - } - - if (acb->verify) { - acb->verify(acb); - } + Coroutine *co_a, *co_b; + + *r = (BlkverifyRequest) { + .co = qemu_coroutine_self(), + .bs = bs, + .offset = offset, + .bytes = bytes, + .qiov = qiov, + .raw_qiov = raw_qiov, + .flags = flags, + .is_write = is_write, + .request_fn = is_write ? bdrv_co_pwritev : bdrv_co_preadv, + }; + + co_a = qemu_coroutine_create(blkverify_do_test_req, r); + co_b = qemu_coroutine_create(blkverify_do_raw_req, r); + + qemu_coroutine_enter(co_a); + qemu_coroutine_enter(co_b); + + while (r->done < 2) { + qemu_coroutine_yield(); + } - aio_bh_schedule_oneshot(bdrv_get_aio_context(acb->common.bs), - blkverify_aio_bh, acb); - break; + if (r->ret != r->raw_ret) { + blkverify_err(r, "return value mismatch %d != %d", r->ret, r->raw_ret); } + + return r->ret; } -static void blkverify_verify_readv(BlkverifyAIOCB *acb) +static int coroutine_fn +blkverify_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes, + QEMUIOVector *qiov, int flags) { - ssize_t offset = qemu_iovec_compare(acb->qiov, &acb->raw_qiov); - if (offset != -1) { - blkverify_err(acb, "contents mismatch in sector %" PRId64, - acb->sector_num + (int64_t)(offset / BDRV_SECTOR_SIZE)); + BlkverifyRequest r; + QEMUIOVector raw_qiov; + void *buf; + ssize_t cmp_offset; + int ret; + + buf = qemu_blockalign(bs->file->bs, qiov->size); + qemu_iovec_init(&raw_qiov, qiov->niov); + qemu_iovec_clone(&raw_qiov, qiov, buf); + + ret = blkverify_co_prwv(bs, &r, offset, bytes, qiov, &raw_qiov, flags, + false); + + cmp_offset = qemu_iovec_compare(qiov, &raw_qiov); + if (cmp_offset != -1) { + blkverify_err(&r, "contents mismatch at offset %" PRId64, + offset + cmp_offset); } -} -static BlockAIOCB *blkverify_aio_readv(BlockDriverState *bs, - int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, - BlockCompletionFunc *cb, void *opaque) -{ - BDRVBlkverifyState *s = bs->opaque; - BlkverifyAIOCB *acb = blkverify_aio_get(bs, false, sector_num, qiov, - nb_sectors, cb, opaque); - - acb->verify = blkverify_verify_readv; - acb->buf = qemu_blockalign(bs->file->bs, qiov->size); - qemu_iovec_init(&acb->raw_qiov, acb->qiov->niov); - qemu_iovec_clone(&acb->raw_qiov, qiov, acb->buf); - - bdrv_aio_readv(s->test_file, sector_num, qiov, nb_sectors, - blkverify_aio_cb, acb); - bdrv_aio_readv(bs->file, sector_num, &acb->raw_qiov, nb_sectors, - blkverify_aio_cb, acb); - return &acb->common; + qemu_iovec_destroy(&raw_qiov); + qemu_vfree(buf); + + return ret; } -static BlockAIOCB *blkverify_aio_writev(BlockDriverState *bs, - int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, - BlockCompletionFunc *cb, void *opaque) +static int coroutine_fn +blkverify_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes, + QEMUIOVector *qiov, int flags) { - BDRVBlkverifyState *s = bs->opaque; - BlkverifyAIOCB *acb = blkverify_aio_get(bs, true, sector_num, qiov, - nb_sectors, cb, opaque); - - bdrv_aio_writev(s->test_file, sector_num, qiov, nb_sectors, - blkverify_aio_cb, acb); - bdrv_aio_writev(bs->file, sector_num, qiov, nb_sectors, - blkverify_aio_cb, acb); - return &acb->common; + BlkverifyRequest r; + return blkverify_co_prwv(bs, &r, offset, bytes, qiov, qiov, flags, true); } -static BlockAIOCB *blkverify_aio_flush(BlockDriverState *bs, - BlockCompletionFunc *cb, - void *opaque) +static int blkverify_co_flush(BlockDriverState *bs) { BDRVBlkverifyState *s = bs->opaque; /* Only flush test file, the raw file is not important */ - return bdrv_aio_flush(s->test_file->bs, cb, opaque); + return bdrv_co_flush(s->test_file->bs); } static bool blkverify_recurse_is_first_non_filter(BlockDriverState *bs, @@ -332,9 +323,9 @@ static BlockDriver bdrv_blkverify = { .bdrv_getlength = blkverify_getlength, .bdrv_refresh_filename = blkverify_refresh_filename, - .bdrv_aio_readv = blkverify_aio_readv, - .bdrv_aio_writev = blkverify_aio_writev, - .bdrv_aio_flush = blkverify_aio_flush, + .bdrv_co_preadv = blkverify_co_preadv, + .bdrv_co_pwritev = blkverify_co_pwritev, + .bdrv_co_flush = blkverify_co_flush, .is_filter = true, .bdrv_recurse_is_first_non_filter = blkverify_recurse_is_first_non_filter, |