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author | Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> | 2020-09-24 21:54:13 +0300 |
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committer | Stefan Hajnoczi <stefanha@redhat.com> | 2020-10-05 10:59:42 +0100 |
commit | fae2681add3bb2f6a5172eceaec0b90a12a73e96 (patch) | |
tree | e408dc164b3e7cf31b80d4cb5306d5e6aa5521a7 | |
parent | 9bb4b066cce7b3cc1f5893dd5f05bf9ee279d383 (diff) | |
download | qemu-fae2681add3bb2f6a5172eceaec0b90a12a73e96.zip qemu-fae2681add3bb2f6a5172eceaec0b90a12a73e96.tar.gz qemu-fae2681add3bb2f6a5172eceaec0b90a12a73e96.tar.bz2 |
block: drop bdrv_prwv
Now that we are not maintaining boilerplate code for coroutine
wrappers, there is no more sense in keeping the extra indirection layer
of bdrv_prwv(). Let's drop it and instead generate pure bdrv_preadv()
and bdrv_pwritev().
Currently, bdrv_pwritev() and bdrv_preadv() are returning bytes on
success, auto generated functions will instead return zero, as their
_co_ prototype. Still, it's simple to make the conversion safe: the
only external user of bdrv_pwritev() is test-bdrv-drain, and it is
comfortable enough with bdrv_co_pwritev() instead. So prototypes are
moved to local block/coroutines.h. Next, the only internal use is
bdrv_pread() and bdrv_pwrite(), which are modified to return bytes on
success.
Of course, it would be great to convert bdrv_pread() and bdrv_pwrite()
to return 0 on success. But this requires audit (and probably
conversion) of all their users, let's leave it for another day
refactoring.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20200924185414.28642-7-vsementsov@virtuozzo.com>
-rw-r--r-- | block/coroutines.h | 10 | ||||
-rw-r--r-- | block/io.c | 49 | ||||
-rw-r--r-- | include/block/block.h | 2 | ||||
-rw-r--r-- | tests/test-bdrv-drain.c | 2 |
4 files changed, 15 insertions, 48 deletions
diff --git a/block/coroutines.h b/block/coroutines.h index c62b3a2..6c63a81 100644 --- a/block/coroutines.h +++ b/block/coroutines.h @@ -31,12 +31,12 @@ int coroutine_fn bdrv_co_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); int coroutine_fn bdrv_co_invalidate_cache(BlockDriverState *bs, Error **errp); -int coroutine_fn -bdrv_co_prwv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov, - bool is_write, BdrvRequestFlags flags); int generated_co_wrapper -bdrv_prwv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov, - bool is_write, BdrvRequestFlags flags); +bdrv_preadv(BdrvChild *child, int64_t offset, unsigned int bytes, + QEMUIOVector *qiov, BdrvRequestFlags flags); +int generated_co_wrapper +bdrv_pwritev(BdrvChild *child, int64_t offset, unsigned int bytes, + QEMUIOVector *qiov, BdrvRequestFlags flags); int coroutine_fn bdrv_co_common_block_status_above(BlockDriverState *bs, @@ -890,23 +890,11 @@ static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, return 0; } -int coroutine_fn bdrv_co_prwv(BdrvChild *child, int64_t offset, - QEMUIOVector *qiov, bool is_write, - BdrvRequestFlags flags) -{ - if (is_write) { - return bdrv_co_pwritev(child, offset, qiov->size, qiov, flags); - } else { - return bdrv_co_preadv(child, offset, qiov->size, qiov, flags); - } -} - int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset, int bytes, BdrvRequestFlags flags) { - QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, NULL, bytes); - - return bdrv_prwv(child, offset, &qiov, true, BDRV_REQ_ZERO_WRITE | flags); + return bdrv_pwritev(child, offset, bytes, NULL, + BDRV_REQ_ZERO_WRITE | flags); } /* @@ -950,41 +938,19 @@ int bdrv_make_zero(BdrvChild *child, BdrvRequestFlags flags) } } -/* return < 0 if error. See bdrv_pwrite() for the return codes */ -int bdrv_preadv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov) -{ - int ret; - - ret = bdrv_prwv(child, offset, qiov, false, 0); - if (ret < 0) { - return ret; - } - - return qiov->size; -} - /* See bdrv_pwrite() for the return codes */ int bdrv_pread(BdrvChild *child, int64_t offset, void *buf, int bytes) { + int ret; QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); if (bytes < 0) { return -EINVAL; } - return bdrv_preadv(child, offset, &qiov); -} - -int bdrv_pwritev(BdrvChild *child, int64_t offset, QEMUIOVector *qiov) -{ - int ret; + ret = bdrv_preadv(child, offset, bytes, &qiov, 0); - ret = bdrv_prwv(child, offset, qiov, true, 0); - if (ret < 0) { - return ret; - } - - return qiov->size; + return ret < 0 ? ret : bytes; } /* Return no. of bytes on success or < 0 on error. Important errors are: @@ -995,13 +961,16 @@ int bdrv_pwritev(BdrvChild *child, int64_t offset, QEMUIOVector *qiov) */ int bdrv_pwrite(BdrvChild *child, int64_t offset, const void *buf, int bytes) { + int ret; QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); if (bytes < 0) { return -EINVAL; } - return bdrv_pwritev(child, offset, &qiov); + ret = bdrv_pwritev(child, offset, bytes, &qiov, 0); + + return ret < 0 ? ret : bytes; } /* diff --git a/include/block/block.h b/include/block/block.h index f2d85f2..eef4cce 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -383,9 +383,7 @@ int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset, int bytes, BdrvRequestFlags flags); int bdrv_make_zero(BdrvChild *child, BdrvRequestFlags flags); int bdrv_pread(BdrvChild *child, int64_t offset, void *buf, int bytes); -int bdrv_preadv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov); int bdrv_pwrite(BdrvChild *child, int64_t offset, const void *buf, int bytes); -int bdrv_pwritev(BdrvChild *child, int64_t offset, QEMUIOVector *qiov); int bdrv_pwrite_sync(BdrvChild *child, int64_t offset, const void *buf, int count); /* diff --git a/tests/test-bdrv-drain.c b/tests/test-bdrv-drain.c index 1107271..1595bbc 100644 --- a/tests/test-bdrv-drain.c +++ b/tests/test-bdrv-drain.c @@ -1872,7 +1872,7 @@ static int coroutine_fn bdrv_replace_test_co_preadv(BlockDriverState *bs, } s->io_co = NULL; - ret = bdrv_preadv(bs->backing, offset, qiov); + ret = bdrv_co_preadv(bs->backing, offset, bytes, qiov, 0); s->has_read = true; /* Wake up drain_co if it runs */ |