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block-backend: align max_transfer to request alignment 

Block device requests must be aligned to bs->bl.request_alignment.
It makes sense for drivers to align bs->bl.max_transfer the same
way; however when there is no specified limit, blk_get_max_transfer
just returns INT_MAX.  Since the contract of the function does not
specify that INT_MAX means "no maximum", just align the outcome
of the function (whether INT_MAX or bs->bl.max_transfer) before
returning it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2021-06-16 15:13:49 +02:00
parent c9797456f6
commit b99f7fa08a
1 changed files with 3 additions and 3 deletions
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6
block/block-backend.c
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@ -1957,12 +1957,12 @@ uint32_t blk_get_request_alignment(BlockBackend *blk)
uint32_t blk_get_max_transfer(BlockBackend *blk)
{
BlockDriverState *bs = blk_bs(blk);
uint32_t max = 0;
uint32_t max = INT_MAX;
if (bs) {
max = bs->bl.max_transfer;
max = MIN_NON_ZERO(max, bs->bl.max_transfer);
}
return MIN_NON_ZERO(max, INT_MAX);
return ROUND_DOWN(max, blk_get_request_alignment(blk));
}
int blk_get_max_iov(BlockBackend *blk)