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block: Set request_alignment during .bdrv_refresh_limits()

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We want to eventually stick request_alignment alongside other
BlockLimits, but first, we must ensure it is populated at the
same time as all other limits, rather than being a special case
that is set only when a block is first opened.

Add a .bdrv_refresh_limits() to all four of our legacy devices
that will always be sector-only (bochs, cloop, dmg, vvfat), in
spite of their recent conversion to expose a byte interface.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2016-06-23 16:37:17 -06:00 • committed by Kevin Wolf
parent 2914a1de99
commit a65064816d
4 changed files with 24 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

7
block/cloop.c
View file

@ -67,7 +67,6 @@ static int cloop_open(BlockDriverState *bs, QDict *options, int flags,
int ret;
bs->read_only = 1;
bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
/* read header */
ret = bdrv_pread(bs->file->bs, 128, &s->block_size, 4);
@ -199,6 +198,11 @@ fail:
return ret;
}
static void cloop_refresh_limits(BlockDriverState *bs, Error **errp)
{
bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
}
static inline int cloop_read_block(BlockDriverState *bs, int block_num)
{
BDRVCloopState *s = bs->opaque;
@ -280,6 +284,7 @@ static BlockDriver bdrv_cloop = {
.instance_size = sizeof(BDRVCloopState),
.bdrv_probe = cloop_probe,
.bdrv_open = cloop_open,
.bdrv_refresh_limits = cloop_refresh_limits,
.bdrv_co_preadv = cloop_co_preadv,
.bdrv_close = cloop_close,
};