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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
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7
block/dmg.c
View file

@ -439,7 +439,6 @@ static int dmg_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 */
s->n_chunks = 0;
s->offsets = s->lengths = s->sectors = s->sectorcounts = NULL;
@ -547,6 +546,11 @@ fail:
return ret;
}
static void dmg_refresh_limits(BlockDriverState *bs, Error **errp)
{
bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
}
static inline int is_sector_in_chunk(BDRVDMGState* s,
uint32_t chunk_num, uint64_t sector_num)
{
@ -720,6 +724,7 @@ static BlockDriver bdrv_dmg = {
.instance_size = sizeof(BDRVDMGState),
.bdrv_probe = dmg_probe,
.bdrv_open = dmg_open,
.bdrv_refresh_limits = dmg_refresh_limits,
.bdrv_co_preadv = dmg_co_preadv,
.bdrv_close = dmg_close,
};