diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2021-04-22 18:43:43 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2021-04-30 12:27:48 +0200 |
| commit | 35b7f4abd5afe159f91ddeb4f2a40c20d2f48367 (patch) | |
| tree | 1a594852fc368c3b7f6d1bfc70353274248011de /include/block | |
| parent | c20555e15fdb84172254dbbde393f07ee0f44af3 (diff) | |
block: Add BDRV_O_NO_SHARE for blk_new_open()
Normally, blk_new_open() just shares all permissions. This was fine
originally when permissions only protected against uses in the same
process because no other part of the code would actually get to access
the block nodes opened with blk_new_open(). However, since we use it for
file locking now, unsharing permissions becomes desirable.
Add a new BDRV_O_NO_SHARE flag that is used in blk_new_open() to unshare
any permissions that can be unshared.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20210422164344.283389-2-kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'include/block')
| -rw-r--r-- | include/block/block.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/block/block.h b/include/block/block.h index 8d5b3ecebd..82185965ff 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -102,6 +102,7 @@ typedef struct HDGeometry { uint32_t cylinders; } HDGeometry; +#define BDRV_O_NO_SHARE 0x0001 /* don't share permissions */ #define BDRV_O_RDWR 0x0002 #define BDRV_O_RESIZE 0x0004 /* request permission for resizing the node */ #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */ |