btrfs: define support masks for ioctl volume args v2

The ioctl data for devices or subvolumes can be passed via btrfs_ioctl_vol_args or btrfs_ioctl_vol_args_v2. The latter is more versatile and needs some caution as some of the flags make sense only for some ioctls. As we're going to extend the flags, define support masks for each ioctl class separately.

David Sterba committed 6 years ago

Commit eed02691 parent 5ce48d01 file · +13 −3Browse files

Showing the changes to include/uapi/linux (1 of 1 file). Show all

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include/uapi/linux/btrfs.h+13−3

@@ -97,16 +97,26 @@ struct btrfs_ioctl_qgroup_limit_args { · 96 unmodified lines
97	97	};
98	98
99	99	/*
100		− * flags for subvolumes
	100	+ * Arguments for specification of subvolumes or devices, supporting by-name or
	101	+ * by-id and flags
101	102	*
102		− * Used by:
103		− * struct btrfs_ioctl_vol_args_v2.flags
	103	+ * The set of supported flags depends on the ioctl
104	104	*
105	105	* BTRFS_SUBVOL_RDONLY is also provided/consumed by the following ioctls:
106	106	* - BTRFS_IOC_SUBVOL_GETFLAGS
107	107	* - BTRFS_IOC_SUBVOL_SETFLAGS
108	108	*/
109	109
	110	+/* Supported flags for BTRFS_IOC_RM_DEV_V2 */
	111	+#define BTRFS_DEVICE_REMOVE_ARGS_MASK \
	112	+ (BTRFS_DEVICE_SPEC_BY_ID)
	113	+
	114	+/* Supported flags for BTRFS_IOC_SNAP_CREATE_V2 and BTRFS_IOC_SUBVOL_CREATE_V2 */
	115	+#define BTRFS_SUBVOL_CREATE_ARGS_MASK \
	116	+ (BTRFS_SUBVOL_CREATE_ASYNC \| \
	117	+ BTRFS_SUBVOL_RDONLY \| \
	118	+ BTRFS_SUBVOL_QGROUP_INHERIT)
	119	+
110	120	struct btrfs_ioctl_vol_args_v2 {
111	121	__s64 fd;
112	122	__u64 transid;