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[PULL 26/30] sheepdog: Support BDRV_REQ_ZERO_WRITE for truncate
From: |
Kevin Wolf |
Subject: |
[PULL 26/30] sheepdog: Support BDRV_REQ_ZERO_WRITE for truncate |
Date: |
Fri, 8 May 2020 14:41:31 +0200 |
From: Eric Blake <address@hidden>
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 <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
---
block/sheepdog.c | 1 +
1 file changed, 1 insertion(+)
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);
--
2.25.3
- [PULL 17/30] backup: Improve error for bdrv_getlength() failure, (continued)
- [PULL 17/30] backup: Improve error for bdrv_getlength() failure, Kevin Wolf, 2020/05/08
- [PULL 20/30] iotests/055: Use cache.no-flush for vmdk target, Kevin Wolf, 2020/05/08
- [PULL 18/30] backup: Make sure that source and target size match, Kevin Wolf, 2020/05/08
- [PULL 29/30] vhdx: Rework truncation logic, Kevin Wolf, 2020/05/08
- [PULL 19/30] iotests: Backup with different source/target size, Kevin Wolf, 2020/05/08
- [PULL 24/30] nfs: Support BDRV_REQ_ZERO_WRITE for truncate, Kevin Wolf, 2020/05/08
- [PULL 25/30] rbd: Support BDRV_REQ_ZERO_WRITE for truncate, Kevin Wolf, 2020/05/08
- [PULL 23/30] file-win32: Support BDRV_REQ_ZERO_WRITE for truncate, Kevin Wolf, 2020/05/08
- [PULL 28/30] parallels: Rework truncation logic, Kevin Wolf, 2020/05/08
- [PULL 30/30] block: Drop unused .bdrv_has_zero_init_truncate, Kevin Wolf, 2020/05/08
- [PULL 26/30] sheepdog: Support BDRV_REQ_ZERO_WRITE for truncate,
Kevin Wolf <=
- Re: [PULL 00/30] Block layer patches, Peter Maydell, 2020/05/08