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sheepdog: Support BDRV_REQ_ZERO_WRITE for truncate

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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>
This commit is contained in:
Eric Blake 2020-04-28 15:29:01 -05:00 committed by Kevin Wolf
parent 2f98910d5b
commit fec00559e7
1 changed files with 1 additions and 0 deletions
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block/sheepdog.c
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@ -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);