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block/iscsi: use the allocationmap also if cache.direct=on 

the allocationmap has only a hint character. The driver always
double checks that blocks marked unallocated in the cache are
still unallocated before taking the fast path and return zeroes.
So using the allocationmap is migration safe and can
also be enabled with cache.direct=on.

Signed-off-by: Peter Lieven <pl@kamp.de>
Message-id: 1429193313-4263-10-git-send-email-pl@kamp.de
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Peter Lieven 2015-04-16 16:08:33 +02:00 committed by Kevin Wolf
parent 03e40fef46
commit 9eac3622a2
1 changed files with 1 additions and 1 deletions
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2
block/iscsi.c
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@ -1499,7 +1499,7 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) {
iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran *
iscsilun->block_size) >> BDRV_SECTOR_BITS;
if (iscsilun->lbprz && !(bs->open_flags & BDRV_O_NOCACHE)) {
if (iscsilun->lbprz) {
iscsilun->allocationmap = iscsi_allocationmap_init(iscsilun);
if (iscsilun->allocationmap == NULL) {
ret = -ENOMEM;