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[Qemu-block] [PATCH v4 01/27] block: Add BDRV_O_NO_LOCK
From: |
Fam Zheng |
Subject: |
[Qemu-block] [PATCH v4 01/27] block: Add BDRV_O_NO_LOCK |
Date: |
Tue, 10 May 2016 10:50:33 +0800 |
Later the block layer will automatically lock the images to avoid unexpected
concurrent accesses to the same image, which will easily corrupt the metadata
or user data, unless in some very special cases, like migration.
The exceptional cases like shared storage migration and testing should set
BDRV_O_NO_LOCK the flag indicating that the block layer should skip the
automatic locking of the image, like the old behavior.
Signed-off-by: Fam Zheng <address@hidden>
Reviewed-by: Denis V. Lunev <address@hidden>
---
include/block/block.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/include/block/block.h b/include/block/block.h
index 3a73137..b803597 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -94,6 +94,7 @@ typedef struct HDGeometry {
select an appropriate protocol driver,
ignoring the format layer */
#define BDRV_O_NO_IO 0x10000 /* don't initialize for I/O */
+#define BDRV_O_NO_LOCK 0x20000 /* don't lock image file */
#define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_NO_FLUSH)
--
2.8.2
- [Qemu-block] [PATCH v4 00/27] block: Lock images when opening, Fam Zheng, 2016/05/09
- [Qemu-block] [PATCH v4 01/27] block: Add BDRV_O_NO_LOCK,
Fam Zheng <=
- [Qemu-block] [PATCH v4 02/27] qapi: Add lock-image in blockdev-add options, Fam Zheng, 2016/05/09
- [Qemu-block] [PATCH v4 03/27] blockdev: Add and parse "lock-image" option for block devices, Fam Zheng, 2016/05/09
- [Qemu-block] [PATCH v4 04/27] block: Introduce image file locking, Fam Zheng, 2016/05/09
- [Qemu-block] [PATCH v4 05/27] block: Add bdrv_image_locked, Fam Zheng, 2016/05/09
- [Qemu-block] [PATCH v4 06/27] block: Make bdrv_reopen_{commit, abort} private functions, Fam Zheng, 2016/05/09
- [Qemu-block] [PATCH v4 07/27] block: Handle image locking during reopen, Fam Zheng, 2016/05/09
- [Qemu-block] [PATCH v4 08/27] osdep: Add qemu_lock_fd and qemu_unlock_fd, Fam Zheng, 2016/05/09