ioctl: Rearrange members in nvme_get_lba_status_args

Avoid any holes in the struct by rearranging the members. Also add the
attribute packed to struct definition to reduce ABI breakage.

struct nvme_get_lba_status_args {
        int                        args_size;            /*     0     4 */
        int                        fd;                   /*     4     4 */
        __u32 *                    result;               /*     8     8 */
        __u32                      timeout;              /*    16     4 */
        __u32                      nsid;                 /*    20     4 */
        __u32                      mndw;                 /*    24     4 */
        enum nvme_lba_status_atype atype;                /*    28     4 */
        __u64                      slba;                 /*    32     8 */
        struct nvme_lba_status *   lbas;                 /*    40     8 */
        __u16                      rl;                   /*    48     2 */

        /* size: 50, cachelines: 1, members: 10 */
        /* last cacheline: 50 bytes */
} __attribute__((__packed__));

Signed-off-by: Daniel Wagner <[email protected]>

Author: dwsuse

src/nvme/ioctl.h

@@ -3009,28 +3009,28 @@ int nvme_security_receive(struct nvme_security_receive_args *args);
 /**
  * nvme_get_lba_status_args - Arguments for the NVMe Get LBA Status command
  * @fd:		File descriptor of nvme device
+ * @result:	The command completion result from CQE dword0
+ * @timeout:	Timeout in ms
  * @nsid:	Namespace ID to retrieve LBA status
- * @slba:	Starting logical block address to check statuses
  * @mndw:	Maximum number of dwords to return
  * @atype:	Action type mechanism to determine LBA status desctriptors to
- * 		return, see &enum nvme_lba_status_atype
- * @rl:		Range length from slba to perform the action
- * @timeout:	Timeout in ms
+ *		return, see &enum nvme_lba_status_atype
+ * @slba:	Starting logical block address to check statuses
  * @lbas:	Data payload to return status descriptors
- * @result:	The command completion result from CQE dword0
+ * @rl:		Range length from slba to perform the action
  */
 struct nvme_get_lba_status_args {
 	int args_size;
 	int fd;
+	__u32 *result;
+	__u32 timeout;
 	__u32 nsid;
-	__u64 slba;
 	__u32 mndw;
-	__u16 rl;
 	enum nvme_lba_status_atype atype;
-	__u32 timeout;
+	__u64 slba;
 	struct nvme_lba_status *lbas;
-	__u32 *result;
-};
+	__u16 rl;
+} __attribute__((__packed__));
 
 /**
  * nvme_get_lba_status() - Retrieve information on possibly unrecoverable LBAs