xfs: wire up new v5 bulkstat ioctls

Wire up the new v5 BULKSTAT ioctl.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>

fs/xfs/libxfs/xfs_fs.h

@@ -435,7 +435,6 @@ struct xfs_fsop_bulkreq {
 	__s32		__user *ocount;	/* output count pointer		*/
 };
 
-
 /*
  * Structures returned from xfs_inumbers routine (XFS_IOC_FSINUMBERS).
  */
@@ -457,6 +456,28 @@ struct xfs_inumbers {
 #define XFS_INUMBERS_VERSION_V1	(1)
 #define XFS_INUMBERS_VERSION_V5	(5)
 
+/* Header for bulk inode requests. */
+struct xfs_bulk_ireq {
+	uint64_t	ino;		/* I/O: start with this inode	*/
+	uint32_t	flags;		/* I/O: operation flags		*/
+	uint32_t	icount;		/* I: count of entries in buffer */
+	uint32_t	ocount;		/* O: count of entries filled out */
+	uint32_t	reserved32;	/* must be zero			*/
+	uint64_t	reserved[5];	/* must be zero			*/
+};
+
+#define XFS_BULK_IREQ_FLAGS_ALL	(0)
+
+/*
+ * ioctl structures for v5 bulkstat and inumbers requests
+ */
+struct xfs_bulkstat_req {
+	struct xfs_bulk_ireq	hdr;
+	struct xfs_bulkstat	bulkstat[];
+};
+#define XFS_BULKSTAT_REQ_SIZE(nr)	(sizeof(struct xfs_bulkstat_req) + \
+					 (nr) * sizeof(struct xfs_bulkstat))
+
 /*
  * Error injection.
  */
@@ -758,6 +779,7 @@ struct xfs_scrub_metadata {
 #define XFS_IOC_FSGEOMETRY_V4	     _IOR ('X', 124, struct xfs_fsop_geom_v4)
 #define XFS_IOC_GOINGDOWN	     _IOR ('X', 125, uint32_t)
 #define XFS_IOC_FSGEOMETRY	     _IOR ('X', 126, struct xfs_fsop_geom)
+#define XFS_IOC_BULKSTAT	     _IOR ('X', 127, struct xfs_bulkstat_req)
 /*	XFS_IOC_GETFSUUID ---------- deprecated 140	 */
 
 

fs/xfs/xfs_ioctl.c

@@ -818,6 +818,101 @@ xfs_ioc_fsbulkstat(
 	return 0;
 }
 
+/* Return 0 on success or positive error */
+static int
+xfs_bulkstat_fmt(
+	struct xfs_ibulk		*breq,
+	const struct xfs_bulkstat	*bstat)
+{
+	if (copy_to_user(breq->ubuffer, bstat, sizeof(struct xfs_bulkstat)))
+		return -EFAULT;
+	return xfs_ibulk_advance(breq, sizeof(struct xfs_bulkstat));
+}
+
+/*
+ * Check the incoming bulk request @hdr from userspace and initialize the
+ * internal @breq bulk request appropriately.  Returns 0 if the bulk request
+ * should proceed; XFS_ITER_ABORT if there's nothing to do; or the usual
+ * negative error code.
+ */
+static int
+xfs_bulk_ireq_setup(
+	struct xfs_mount	*mp,
+	struct xfs_bulk_ireq	*hdr,
+	struct xfs_ibulk	*breq,
+	void __user		*ubuffer)
+{
+	if (hdr->icount == 0 ||
+	    (hdr->flags & ~XFS_BULK_IREQ_FLAGS_ALL) ||
+	    hdr->reserved32 ||
+	    memchr_inv(hdr->reserved, 0, sizeof(hdr->reserved)))
+		return -EINVAL;
+
+	breq->startino = hdr->ino;
+	breq->ubuffer = ubuffer;
+	breq->icount = hdr->icount;
+	breq->ocount = 0;
+
+	/* Asking for an inode past the end of the FS?  We're done! */
+	if (XFS_INO_TO_AGNO(mp, breq->startino) >= mp->m_sb.sb_agcount)
+		return XFS_ITER_ABORT;
+
+	return 0;
+}
+
+/*
+ * Update the userspace bulk request @hdr to reflect the end state of the
+ * internal bulk request @breq.
+ */
+static void
+xfs_bulk_ireq_teardown(
+	struct xfs_bulk_ireq	*hdr,
+	struct xfs_ibulk	*breq)
+{
+	hdr->ino = breq->startino;
+	hdr->ocount = breq->ocount;
+}
+
+/* Handle the v5 bulkstat ioctl. */
+STATIC int
+xfs_ioc_bulkstat(
+	struct xfs_mount		*mp,
+	unsigned int			cmd,
+	struct xfs_bulkstat_req __user	*arg)
+{
+	struct xfs_bulk_ireq		hdr;
+	struct xfs_ibulk		breq = {
+		.mp			= mp,
+	};
+	int				error;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	if (XFS_FORCED_SHUTDOWN(mp))
+		return -EIO;
+
+	if (copy_from_user(&hdr, &arg->hdr, sizeof(hdr)))
+		return -EFAULT;
+
+	error = xfs_bulk_ireq_setup(mp, &hdr, &breq, arg->bulkstat);
+	if (error == XFS_ITER_ABORT)
+		goto out_teardown;
+	if (error < 0)
+		return error;
+
+	error = xfs_bulkstat(&breq, xfs_bulkstat_fmt);
+	if (error)
+		return error;
+
+out_teardown:
+	xfs_bulk_ireq_teardown(&hdr, &breq);
+	if (copy_to_user(&arg->hdr, &hdr, sizeof(hdr)))
+		return -EFAULT;
+
+	return 0;
+}
+
 STATIC int
 xfs_ioc_fsgeometry(
 	struct xfs_mount	*mp,
@@ -1982,6 +2077,9 @@ xfs_file_ioctl(
 	case XFS_IOC_FSINUMBERS:
 		return xfs_ioc_fsbulkstat(mp, cmd, arg);
 
+	case XFS_IOC_BULKSTAT:
+		return xfs_ioc_bulkstat(mp, cmd, arg);
+
 	case XFS_IOC_FSGEOMETRY_V1:
 		return xfs_ioc_fsgeometry(mp, arg, 3);
 	case XFS_IOC_FSGEOMETRY_V4:

fs/xfs/xfs_ioctl32.c

@@ -574,6 +574,7 @@ xfs_file_compat_ioctl(
 	case XFS_IOC_ERROR_CLEARALL:
 	case FS_IOC_GETFSMAP:
 	case XFS_IOC_SCRUB_METADATA:
+	case XFS_IOC_BULKSTAT:
 		return xfs_file_ioctl(filp, cmd, p);
 #if !defined(BROKEN_X86_ALIGNMENT) || defined(CONFIG_X86_X32)
 	/*

fs/xfs/xfs_ondisk.h

@@ -149,6 +149,7 @@ xfs_check_ondisk_structs(void)
 
 	XFS_CHECK_STRUCT_SIZE(struct xfs_bulkstat,		192);
 	XFS_CHECK_STRUCT_SIZE(struct xfs_inumbers,		24);
+	XFS_CHECK_STRUCT_SIZE(struct xfs_bulkstat_req,		64);
 }
 
 #endif /* __XFS_ONDISK_H */