block: Set request_alignment during .bdrv_refresh_limits()

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>

1 files changed, 6 insertions, 1 deletions

diff --git a/block/cloop.c b/block/cloop.c
index ea5a92b6d4..d574003c70 100644
--- a/block/cloop.c
+++ b/block/cloop.c
@@ -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,
 };