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BlockLimits: introduce max_transfer_length 

Signed-off-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Peter Lieven 2014-10-27 10:18:44 +01:00 committed by Stefan Hajnoczi
parent ac3a872664
commit 2647fab57d
2 changed files with 7 additions and 0 deletions
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4
block.c
View File

@ -519,6 +519,7 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
return;
}
bs->bl.opt_transfer_length = bs->file->bl.opt_transfer_length;
bs->bl.max_transfer_length = bs->file->bl.max_transfer_length;
bs->bl.opt_mem_alignment = bs->file->bl.opt_mem_alignment;
} else {
bs->bl.opt_mem_alignment = 512;
@ -533,6 +534,9 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
bs->bl.opt_transfer_length =
MAX(bs->bl.opt_transfer_length,
bs->backing_hd->bl.opt_transfer_length);
bs->bl.max_transfer_length =
MIN_NON_ZERO(bs->bl.max_transfer_length,
bs->backing_hd->bl.max_transfer_length);
bs->bl.opt_mem_alignment =
MAX(bs->bl.opt_mem_alignment,
bs->backing_hd->bl.opt_mem_alignment);

3
include/block/block_int.h
View File

@ -289,6 +289,9 @@ typedef struct BlockLimits {
/* optimal transfer length in sectors */
int opt_transfer_length;
/* maximal transfer length in sectors */
int max_transfer_length;
/* memory alignment so that no bounce buffer is needed */
size_t opt_mem_alignment;
} BlockLimits;