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block/io: allow 64bit write-zeroes requests 

Now that all drivers are updated by previous commit, we can drop two
last limiters on write-zeroes path: INT_MAX in
bdrv_co_do_pwrite_zeroes() and bdrv_check_request32() in
bdrv_co_pwritev_part().

Now everything is prepared for implementing incredibly cool and fast
big-write-zeroes in NBD and qcow2. And any other driver which wants it
of course.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210903102807.27127-9-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2021-09-03 13:28:04 +03:00 committed by Eric Blake
parent f34b2bcf8c
commit 2aaa3f9b33
1 changed files with 7 additions and 2 deletions
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9
block/io.c
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@ -1869,7 +1869,8 @@ static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs,
int head = 0;
int tail = 0;
int64_t max_write_zeroes = MIN_NON_ZERO(bs->bl.max_pwrite_zeroes, INT_MAX);
int64_t max_write_zeroes = MIN_NON_ZERO(bs->bl.max_pwrite_zeroes,
INT64_MAX);
int alignment = MAX(bs->bl.pwrite_zeroes_alignment,
bs->bl.request_alignment);
int max_transfer = MIN_NON_ZERO(bs->bl.max_transfer, MAX_BOUNCE_BUFFER);
@ -2248,7 +2249,11 @@ int coroutine_fn bdrv_co_pwritev_part(BdrvChild *child,
return -ENOMEDIUM;
}
ret = bdrv_check_request32(offset, bytes, qiov, qiov_offset);
if (flags & BDRV_REQ_ZERO_WRITE) {
ret = bdrv_check_qiov_request(offset, bytes, qiov, qiov_offset, NULL);
} else {
ret = bdrv_check_request32(offset, bytes, qiov, qiov_offset);
}
if (ret < 0) {
return ret;
}