diff mbox series

[PULL,26/30] sheepdog: Support BDRV_REQ_ZERO_WRITE for truncate

Message ID 20200508124135.252565-27-kwolf@redhat.com
State New
Headers show
Series Block layer patches | expand

Commit Message

Kevin Wolf May 8, 2020, 12:41 p.m. UTC 
From: Eric Blake <eblake@redhat.com>

Our .bdrv_has_zero_init_truncate always returns 1 because sheepdog
always 0-fills; we can use that same knowledge to implement
BDRV_REQ_ZERO_WRITE by ignoring it.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200428202905.770727-6-eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/sheepdog.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/block/sheepdog.c b/block/sheepdog.c
index 2eb61938ff..739e6dee30 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -1654,6 +1654,7 @@  static int sd_open(BlockDriverState *bs, QDict *options, int flags,
     memcpy(&s->inode, buf, sizeof(s->inode));
 
     bs->total_sectors = s->inode.vdi_size / BDRV_SECTOR_SIZE;
+    bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
     pstrcpy(s->name, sizeof(s->name), vdi);
     qemu_co_mutex_init(&s->lock);
     qemu_co_mutex_init(&s->queue_lock);