xfs: introduce v5 inode group structure

Introduce a new "v5" inode group structure that fixes the alignment
and padding problems of the existing structure.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>

fs/xfs/libxfs/xfs_fs.h

@@ -445,6 +445,17 @@ struct xfs_inogrp {
 	__u64		xi_allocmask;	/* mask of allocated inodes	*/
 };
 
+/* New inumbers structure that reports v5 features and fixes padding issues */
+struct xfs_inumbers {
+	uint64_t	xi_startino;	/* starting inode number	*/
+	uint64_t	xi_allocmask;	/* mask of allocated inodes	*/
+	uint8_t		xi_alloccount;	/* # bits set in allocmask	*/
+	uint8_t		xi_version;	/* version			*/
+	uint8_t		xi_padding[6];	/* zero				*/
+};
+
+#define XFS_INUMBERS_VERSION_V1	(1)
+#define XFS_INUMBERS_VERSION_V5	(5)
 
 /*
  * Error injection.

fs/xfs/xfs_ioctl.c

@@ -729,10 +729,13 @@ xfs_fsbulkstat_one_fmt(
 
 int
 xfs_fsinumbers_fmt(
-	struct xfs_ibulk	*breq,
+	struct xfs_ibulk		*breq,
-	const struct xfs_inogrp	*igrp)
+	const struct xfs_inumbers	*igrp)
 {
-	if (copy_to_user(breq->ubuffer, igrp, sizeof(*igrp)))
+	struct xfs_inogrp		ig1;
+
+	xfs_inumbers_to_inogrp(&ig1, igrp);
+	if (copy_to_user(breq->ubuffer, &ig1, sizeof(struct xfs_inogrp)))
 		return -EFAULT;
 	return xfs_ibulk_advance(breq, sizeof(struct xfs_inogrp));
 }

fs/xfs/xfs_ioctl.h

@@ -83,6 +83,6 @@ struct xfs_inogrp;
 
 int xfs_fsbulkstat_one_fmt(struct xfs_ibulk *breq,
 			   const struct xfs_bulkstat *bstat);
-int xfs_fsinumbers_fmt(struct xfs_ibulk *breq, const struct xfs_inogrp *igrp);
+int xfs_fsinumbers_fmt(struct xfs_ibulk *breq, const struct xfs_inumbers *igrp);
 
 #endif

fs/xfs/xfs_ioctl32.c

@@ -81,10 +81,14 @@ xfs_compat_growfs_rt_copyin(
 
 STATIC int
 xfs_fsinumbers_fmt_compat(
-	struct xfs_ibulk	*breq,
+	struct xfs_ibulk		*breq,
-	const struct xfs_inogrp	*igrp)
+	const struct xfs_inumbers	*ig)
 {
-	struct compat_xfs_inogrp __user *p32 = breq->ubuffer;
+	struct compat_xfs_inogrp __user	*p32 = breq->ubuffer;
+	struct xfs_inogrp		ig1;
+	struct xfs_inogrp		*igrp = &ig1;
+
+	xfs_inumbers_to_inogrp(&ig1, ig);
 
 	if (put_user(igrp->xi_startino,   &p32->xi_startino) ||
 	    put_user(igrp->xi_alloccount, &p32->xi_alloccount) ||

fs/xfs/xfs_itable.c

@@ -331,10 +331,11 @@ xfs_inumbers_walk(
 	const struct xfs_inobt_rec_incore *irec,
 	void			*data)
 {
-	struct xfs_inogrp	inogrp = {
+	struct xfs_inumbers	inogrp = {
 		.xi_startino	= XFS_AGINO_TO_INO(mp, agno, irec->ir_startino),
 		.xi_alloccount	= irec->ir_count - irec->ir_freecount,
 		.xi_allocmask	= ~irec->ir_free,
+		.xi_version	= XFS_INUMBERS_VERSION_V5,
 	};
 	struct xfs_inumbers_chunk *ic = data;
 	xfs_agino_t		agino;
@@ -381,3 +382,14 @@ xfs_inumbers(
 
 	return error;
 }
+
+/* Convert an inumbers (v5) struct to a inogrp (v1) struct. */
+void
+xfs_inumbers_to_inogrp(
+	struct xfs_inogrp		*ig1,
+	const struct xfs_inumbers	*ig)
+{
+	ig1->xi_startino = ig->xi_startino;
+	ig1->xi_alloccount = ig->xi_alloccount;
+	ig1->xi_allocmask = ig->xi_allocmask;
+}

fs/xfs/xfs_itable.h

@@ -46,8 +46,10 @@ void xfs_bulkstat_to_bstat(struct xfs_mount *mp, struct xfs_bstat *bs1,
 		const struct xfs_bulkstat *bstat);
 
 typedef int (*inumbers_fmt_pf)(struct xfs_ibulk *breq,
-		const struct xfs_inogrp *igrp);
+		const struct xfs_inumbers *igrp);
 
 int xfs_inumbers(struct xfs_ibulk *breq, inumbers_fmt_pf formatter);
+void xfs_inumbers_to_inogrp(struct xfs_inogrp *ig1,
+		const struct xfs_inumbers *ig);
 
 #endif	/* __XFS_ITABLE_H__ */

fs/xfs/xfs_ondisk.h

@@ -148,6 +148,7 @@ xfs_check_ondisk_structs(void)
 	XFS_CHECK_OFFSET(struct xfs_attr3_leafblock, hdr.info.hdr, 0);
 
 	XFS_CHECK_STRUCT_SIZE(struct xfs_bulkstat,		192);
+	XFS_CHECK_STRUCT_SIZE(struct xfs_inumbers,		24);
 }
 
 #endif /* __XFS_ONDISK_H */