[XFS] Add XFS_FS_GOINGDOWN interface to xfs.

SGI Modid: xfs-linux:xfs-kern:166489a

fs/xfs/linux/xfs_ioctl.c

@@ -699,9 +699,7 @@ xfs_ioctl(
 
 		error = xfs_set_dmattrs(bdp, dmi.fsd_dmevmask, dmi.fsd_dmstate,
 							NULL);
-		if (error)
-			return -error;
-		return 0;
+		return -error;
 	}
 
 	case XFS_IOC_GETBMAP:
@@ -733,9 +731,7 @@ xfs_ioctl(
 
 	case XFS_IOC_SWAPEXT: {
 		error = xfs_swapext((struct xfs_swapext *)arg);
-		if (error)
-			return -error;
-		return 0;
+		return -error;
 	}
 
 	case XFS_IOC_FSCOUNTS: {
@@ -763,6 +759,8 @@ xfs_ioctl(
 		/* input parameter is passed in resblks field of structure */
 		in = inout.resblks;
 		error = xfs_reserve_blocks(mp, &in, &inout);
+		if (error)
+			return -error;
 
 		if (copy_to_user((char *)arg, &inout, sizeof(inout)))
 			return -XFS_ERROR(EFAULT);
@@ -795,9 +793,7 @@ xfs_ioctl(
 			return -XFS_ERROR(EFAULT);
 
 		error = xfs_growfs_data(mp, &in);
-		if (error)
-			return -error;
-		return 0;
+		return -error;
 	}
 
 	case XFS_IOC_FSGROWFSLOG: {
@@ -810,9 +806,7 @@ xfs_ioctl(
 			return -XFS_ERROR(EFAULT);
 
 		error = xfs_growfs_log(mp, &in);
-		if (error)
-			return -error;
-		return 0;
+		return -error;
 	}
 
 	case XFS_IOC_FSGROWFSRT: {
@@ -825,9 +819,7 @@ xfs_ioctl(
 			return -XFS_ERROR(EFAULT);
 
 		error = xfs_growfs_rt(mp, &in);
-		if (error)
-			return -error;
-		return 0;
+		return -error;
 	}
 
 	case XFS_IOC_FREEZE:
@@ -842,6 +834,19 @@ xfs_ioctl(
 		xfs_fs_thaw(mp);
 		return 0;
 
+	case XFS_IOC_GOINGDOWN: {
+		__uint32_t in;
+
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+
+		if (get_user(in, (__uint32_t *)arg))
+			return -XFS_ERROR(EFAULT);
+
+		error = xfs_fs_goingdown(mp, in);
+		return -error;
+	}
+
 	case XFS_IOC_ERROR_INJECTION: {
 		xfs_error_injection_t in;
 
@@ -849,9 +854,7 @@ xfs_ioctl(
 			return -XFS_ERROR(EFAULT);
 
 		error = xfs_errortag_add(in.errtag, mp);
-		if (error)
-			return -error;
-		return 0;
+		return -error;
 	}
 
 	case XFS_IOC_ERROR_CLEARALL:

fs/xfs/xfs_fs.h

@@ -437,6 +437,12 @@ typedef struct xfs_handle {
 
 #define FSHSIZE		sizeof(fsid_t)
 
+/* 
+ * Flags for going down operation
+ */
+#define XFS_FSOP_GOING_FLAGS_DEFAULT		0x0	/* going down */
+#define XFS_FSOP_GOING_FLAGS_LOGFLUSH		0x1	/* flush log but not data */
+#define XFS_FSOP_GOING_FLAGS_NOLOGFLUSH		0x2	/* don't flush log nor data */
 
 /*
  * ioctl commands that replace IRIX fcntl()'s
@@ -490,6 +496,7 @@ typedef struct xfs_handle {
 #define XFS_IOC_ATTRLIST_BY_HANDLE   _IOW ('X', 122, struct xfs_fsop_attrlist_handlereq)
 #define XFS_IOC_ATTRMULTI_BY_HANDLE  _IOW ('X', 123, struct xfs_fsop_attrmulti_handlereq)
 #define XFS_IOC_FSGEOMETRY	     _IOR ('X', 124, struct xfs_fsop_geom)
+#define XFS_IOC_GOINGDOWN	     _IOR ('X', 125, __uint32_t)
 /*	XFS_IOC_GETFSUUID ---------- deprecated 140	 */
 
 

fs/xfs/xfs_fsops.c

@@ -626,3 +626,28 @@ xfs_fs_thaw(
 	xfs_finish_freeze(mp);
 	return 0;
 }
+
+int
+xfs_fs_goingdown(
+	xfs_mount_t	*mp,
+	__uint32_t	inflags)
+{
+	switch (inflags)
+	{
+	case XFS_FSOP_GOING_FLAGS_DEFAULT:
+		xfs_fs_freeze(mp);
+		xfs_force_shutdown(mp, XFS_FORCE_UMOUNT);
+		xfs_fs_thaw(mp);
+		break;
+	case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
+		xfs_force_shutdown(mp, XFS_FORCE_UMOUNT);
+		break;
+	case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
+		xfs_force_shutdown(mp, XFS_FORCE_UMOUNT|XFS_LOG_IO_ERROR);
+		break;
+	default:
+		return XFS_ERROR(EINVAL);
+	}
+
+	return 0;
+}

fs/xfs/xfs_fsops.h

@@ -67,4 +67,9 @@ int
 xfs_fs_thaw(
 	xfs_mount_t		*mp);
 
+int
+xfs_fs_goingdown(
+	xfs_mount_t		*mp,
+	__uint32_t		inflags);
+
 #endif	/* __XFS_FSOPS_H__ */