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[Qemu-block] [PATCH v5 01/27] block: Add flag bits for image locking
From: |
Fam Zheng |
Subject: |
[Qemu-block] [PATCH v5 01/27] block: Add flag bits for image locking |
Date: |
Tue, 17 May 2016 15:35:10 +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_SHARED_LOCK or BDRV_O_NO_LOCK to advise an appropriate
locking mode.
Signed-off-by: Fam Zheng <address@hidden>
---
include/block/block.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/include/block/block.h b/include/block/block.h
index b210832..14f7300 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -94,6 +94,8 @@ 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_SHARED_LOCK 0x40000 /* lock the image file in shared mode */
#define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_NO_FLUSH)
--
2.8.2
- [Qemu-block] [PATCH v5 00/27] block: Lock images when opening, Fam Zheng, 2016/05/17
- [Qemu-block] [PATCH v5 01/27] block: Add flag bits for image locking,
Fam Zheng <=
- [Qemu-block] [PATCH v5 03/27] blockdev: Add and parse "lock-mode" option for image locking, Fam Zheng, 2016/05/17
- [Qemu-block] [PATCH v5 02/27] qapi: Add lock-mode in blockdev-add options, Fam Zheng, 2016/05/17
- [Qemu-block] [PATCH v5 04/27] block: Introduce image file locking, Fam Zheng, 2016/05/17
- [Qemu-block] [PATCH v5 05/27] block: Add bdrv_image_locked, Fam Zheng, 2016/05/17
- [Qemu-block] [PATCH v5 06/27] block: Make bdrv_reopen_{commit, abort} private functions, Fam Zheng, 2016/05/17