diff options
author | Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> | 2021-09-03 13:28:00 +0300 |
---|---|---|
committer | Eric Blake <eblake@redhat.com> | 2021-09-29 13:46:31 -0500 |
commit | e75abedab7e10043ed81b1cbc3033409aff0159e (patch) | |
tree | 7d786ebfbb38f8657be0a7ce77d054693c4d431f /block/filter-compress.c | |
parent | f7ef38dd1310d7d9db76d0aa16899cbc5744f36d (diff) | |
download | qemu-e75abedab7e10043ed81b1cbc3033409aff0159e.zip qemu-e75abedab7e10043ed81b1cbc3033409aff0159e.tar.gz qemu-e75abedab7e10043ed81b1cbc3033409aff0159e.tar.bz2 |
block: use int64_t instead of uint64_t in driver write handlers
We are generally moving to int64_t for both offset and bytes parameters
on all io paths.
Main motivation is realization of 64-bit write_zeroes operation for
fast zeroing large disk chunks, up to the whole disk.
We chose signed type, to be consistent with off_t (which is signed) and
with possibility for signed return type (where negative value means
error).
So, convert driver write handlers parameters which are already 64bit to
signed type.
While being here, convert also flags parameter to be BdrvRequestFlags.
Now let's consider all callers. Simple
git grep '\->bdrv_\(aio\|co\)_pwritev\(_part\)\?'
shows that's there three callers of driver function:
bdrv_driver_pwritev() and bdrv_driver_pwritev_compressed() in
block/io.c, both pass int64_t, checked by bdrv_check_qiov_request() to
be non-negative.
qcow2_save_vmstate() does bdrv_check_qiov_request().
Still, the functions may be called directly, not only by drv->...
Let's check:
git grep '\.bdrv_\(aio\|co\)_pwritev\(_part\)\?\s*=' | \
awk '{print $4}' | sed 's/,//' | sed 's/&//' | sort | uniq | \
while read func; do git grep "$func(" | \
grep -v "$func(BlockDriverState"; done
shows several callers:
qcow2:
qcow2_co_truncate() write at most up to @offset, which is checked in
generic qcow2_co_truncate() by bdrv_check_request().
qcow2_co_pwritev_compressed_task() pass the request (or part of the
request) that already went through normal write path, so it should
be OK
qcow:
qcow_co_pwritev_compressed() pass int64_t, it's updated by this patch
quorum:
quorum_co_pwrite_zeroes() pass int64_t and int - OK
throttle:
throttle_co_pwritev_compressed() pass int64_t, it's updated by this
patch
vmdk:
vmdk_co_pwritev_compressed() pass int64_t, it's updated by this
patch
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210903102807.27127-5-vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'block/filter-compress.c')
-rw-r--r-- | block/filter-compress.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/block/filter-compress.c b/block/filter-compress.c index 54a16c6..505822a 100644 --- a/block/filter-compress.c +++ b/block/filter-compress.c @@ -74,10 +74,11 @@ static int coroutine_fn compress_co_preadv_part(BlockDriverState *bs, static int coroutine_fn compress_co_pwritev_part(BlockDriverState *bs, - uint64_t offset, - uint64_t bytes, + int64_t offset, + int64_t bytes, QEMUIOVector *qiov, - size_t qiov_offset, int flags) + size_t qiov_offset, + BdrvRequestFlags flags) { return bdrv_co_pwritev_part(bs->file, offset, bytes, qiov, qiov_offset, flags | BDRV_REQ_WRITE_COMPRESSED); |