xfs: Add shrink data ioctl(2)

index c459d52..3a85979 100644
@@ -272,6 +272,13 @@ typedef struct xfs_growfs_rt {
 	__u32		extsize;	/* new realtime extent size, fsblocks */
 } xfs_growfs_rt_t;
 
+/*
+ * Structure for XFS_IOC_SHRINKFS_DATA.
+ */
+typedef struct xfs_shrinkfs_data {
+	__u64		newblocks;	/* new data subvol size, fsblocks */
+	__u32		imaxpct;	/* new inode space percentage limit */
+} xfs_shrinkfs_data_t;
 
 /*
  * Structures returned from ioctl XFS_IOC_FSBULKSTAT & XFS_IOC_FSBULKSTAT_SINGLE

@@ -489,6 +496,7 @@ typedef struct xfs_handle {
 #define XFS_IOC_SET_AGSTATE	     _IOW('X', 126, struct xfs_ioc_agstate)
 #define XFS_IOC_GET_AGSTATE	     _IOR('X', 127, struct xfs_ioc_agstate)
 #define XFS_IOC_SWAPINO		     _IOWR('X', 128, struct xfs_swapino)
+#define XFS_IOC_FSSHRINKFS_DATA	     _IOW('X', 129, struct xfs_shrinkfs_data)
 /*	XFS_IOC_GETFSUUID ---------- deprecated 140	 */
 
 

224 lines not on this page · raw message

index 1b6a98b..40be112 100644
@@ -26,5 +26,6 @@ extern int xfs_reserve_blocks(xfs_mount_t *mp, __uint64_t *inval,
 				xfs_fsop_resblks_t *outval);
 extern int xfs_fs_goingdown(xfs_mount_t *mp, __uint32_t inflags);
 extern int xfs_fs_log_dummy(struct xfs_mount *mp);
+extern int xfs_shrinkfs_data(xfs_mount_t *mp, xfs_shrinkfs_data_t *in);
 
 #endif	/* __XFS_FSOPS_H__ */

index 0e0c03f..41b2900 100644
@@ -1649,6 +1649,21 @@ xfs_file_ioctl(
 		return -error;
 	}
 
+	case XFS_IOC_FSSHRINKFS_DATA: {
+		xfs_shrinkfs_data_t	in;
+
+		if (copy_from_user(&in, arg, sizeof(in)))
+			return -XFS_ERROR(EFAULT);
+
+		error = mnt_want_write_file(filp);
+		if (error)
+			return error;
+
+		error = xfs_shrinkfs_data(mp, &in);
+		mnt_drop_write_file(filp);
+		return -error;
+	}
+
 	default:
 		return -ENOTTY;
 	}