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| author | Max Reitz | 2018-04-21 15:29:23 +0200 |
|---|---|---|
| committer | Max Reitz | 2018-05-15 16:15:21 +0200 |
| commit | c6035964f8316b504060618d05b5dd434f18595b (patch) | |
| tree | d6b2279cf0ce77c58d2d41cb1014d265c1380c3d /include/block/block.h | |
| parent | block: BLK_PERM_WRITE includes ..._UNCHANGED (diff) | |
| download | qemu-c6035964f8316b504060618d05b5dd434f18595b.tar.gz qemu-c6035964f8316b504060618d05b5dd434f18595b.tar.xz qemu-c6035964f8316b504060618d05b5dd434f18595b.zip | |
block: Add BDRV_REQ_WRITE_UNCHANGED flag
This flag signifies that a write request will not change the visible
disk content. With this flag set, it is sufficient to have the
BLK_PERM_WRITE_UNCHANGED permission instead of BLK_PERM_WRITE.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Message-id: 20180421132929.21610-4-mreitz@redhat.com
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'include/block/block.h')
| -rw-r--r-- | include/block/block.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/include/block/block.h b/include/block/block.h index 397b5e8d44..3894edda9d 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -54,8 +54,12 @@ typedef enum { BDRV_REQ_FUA = 0x10, BDRV_REQ_WRITE_COMPRESSED = 0x20, + /* Signifies that this write request will not change the visible disk + * content. */ + BDRV_REQ_WRITE_UNCHANGED = 0x40, + /* Mask of valid flags */ - BDRV_REQ_MASK = 0x3f, + BDRV_REQ_MASK = 0x7f, } BdrvRequestFlags; typedef struct BlockSizes { |