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authorKevin Wolf <kwolf@redhat.com>2016-12-20 16:52:41 +0100
committerKevin Wolf <kwolf@redhat.com>2017-02-28 20:40:35 +0100
commit7006c9a76119a863e5812de572841618b9540ac2 (patch)
tree2ac1f0f472a6df05cfc1b2b86d0ac54d954c1856 /include/block/block.h
parent9e19ad4e49c8dc7f776bf770f52ad6ea1ec28edc (diff)
block: Add op blocker permission constants
This patch defines the permission categories that will be used by the new op blocker system. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Acked-by: Fam Zheng <famz@redhat.com>
Diffstat (limited to 'include/block/block.h')
-rw-r--r--include/block/block.h36
1 files changed, 36 insertions, 0 deletions
diff --git a/include/block/block.h b/include/block/block.h
index bde5ebda18..f62f38e6a4 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -187,6 +187,42 @@ typedef enum BlockOpType {
BLOCK_OP_TYPE_MAX,
} BlockOpType;
+/* Block node permission constants */
+enum {
+ /**
+ * A user that has the "permission" of consistent reads is guaranteed that
+ * their view of the contents of the block device is complete and
+ * self-consistent, representing the contents of a disk at a specific
+ * point.
+ *
+ * For most block devices (including their backing files) this is true, but
+ * the property cannot be maintained in a few situations like for
+ * intermediate nodes of a commit block job.
+ */
+ BLK_PERM_CONSISTENT_READ = 0x01,
+
+ /** This permission is required to change the visible disk contents. */
+ BLK_PERM_WRITE = 0x02,
+
+ /**
+ * This permission (which is weaker than BLK_PERM_WRITE) is both enough and
+ * required for writes to the block node when the caller promises that
+ * the visible disk content doesn't change.
+ */
+ BLK_PERM_WRITE_UNCHANGED = 0x04,
+
+ /** This permission is required to change the size of a block node. */
+ BLK_PERM_RESIZE = 0x08,
+
+ /**
+ * This permission is required to change the node that this BdrvChild
+ * points to.
+ */
+ BLK_PERM_GRAPH_MOD = 0x10,
+
+ BLK_PERM_ALL = 0x1f,
+};
+
/* disk I/O throttling */
void bdrv_init(void);
void bdrv_init_with_whitelist(void);