[PATCH 19/52] xfs: export the geometry of realtime groups to userspace

["Darrick J. Wong" <djwong@xxxxxxxxxx>]

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Source kernel commit: 3fa7a6d0c7eb264e469eaf1e3ef59b6793a853ee

Create an ioctl so that the kernel can report the status of realtime
groups to userspace.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
 libxfs/util.c        |    7 +++++++
 libxfs/xfs_fs.h      |   16 ++++++++++++++++
 libxfs/xfs_health.h  |    2 ++
 libxfs/xfs_rtgroup.c |   14 ++++++++++++++
 libxfs/xfs_rtgroup.h |    4 ++++
 5 files changed, 43 insertions(+)


diff --git a/libxfs/util.c b/libxfs/util.c
index 83f2f048bbe9f2..ed48e2045b484b 100644
--- a/libxfs/util.c
+++ b/libxfs/util.c
@@ -492,6 +492,13 @@ xfs_fs_mark_healthy(
 }
 
 void xfs_ag_geom_health(struct xfs_perag *pag, struct xfs_ag_geometry *ageo) { }
+void
+xfs_rtgroup_geom_health(
+	struct xfs_rtgroup		*rtg,
+	struct xfs_rtgroup_geometry	*rgeo)
+{
+	/* empty */
+}
 void xfs_fs_mark_sick(struct xfs_mount *mp, unsigned int mask) { }
 void xfs_agno_mark_sick(struct xfs_mount *mp, xfs_agnumber_t agno,
 		unsigned int mask) { }
diff --git a/libxfs/xfs_fs.h b/libxfs/xfs_fs.h
index 5c224d03270ce9..4c0682173d6144 100644
--- a/libxfs/xfs_fs.h
+++ b/libxfs/xfs_fs.h
@@ -971,6 +971,21 @@ struct xfs_getparents_by_handle {
 	struct xfs_getparents		gph_request;
 };
 
+/*
+ * Output for XFS_IOC_RTGROUP_GEOMETRY
+ */
+struct xfs_rtgroup_geometry {
+	__u32 rg_number;	/* i/o: rtgroup number */
+	__u32 rg_length;	/* o: length in blocks */
+	__u32 rg_sick;		/* o: sick things in ag */
+	__u32 rg_checked;	/* o: checked metadata in ag */
+	__u32 rg_flags;		/* i/o: flags for this ag */
+	__u32 rg_reserved[27];	/* o: zero */
+};
+#define XFS_RTGROUP_GEOM_SICK_SUPER	(1U << 0)  /* superblock */
+#define XFS_RTGROUP_GEOM_SICK_BITMAP	(1U << 1)  /* rtbitmap */
+#define XFS_RTGROUP_GEOM_SICK_SUMMARY	(1U << 2)  /* rtsummary */
+
 /*
  * ioctl commands that are used by Linux filesystems
  */
@@ -1009,6 +1024,7 @@ struct xfs_getparents_by_handle {
 #define XFS_IOC_GETPARENTS	_IOWR('X', 62, struct xfs_getparents)
 #define XFS_IOC_GETPARENTS_BY_HANDLE _IOWR('X', 63, struct xfs_getparents_by_handle)
 #define XFS_IOC_SCRUBV_METADATA	_IOWR('X', 64, struct xfs_scrub_vec_head)
+#define XFS_IOC_RTGROUP_GEOMETRY _IOWR('X', 65, struct xfs_rtgroup_geometry)
 
 /*
  * ioctl commands that replace IRIX syssgi()'s
diff --git a/libxfs/xfs_health.h b/libxfs/xfs_health.h
index 3d93b57cf57143..d34986ac18c3fa 100644
--- a/libxfs/xfs_health.h
+++ b/libxfs/xfs_health.h
@@ -278,6 +278,8 @@ xfs_inode_is_healthy(struct xfs_inode *ip)
 
 void xfs_fsop_geom_health(struct xfs_mount *mp, struct xfs_fsop_geom *geo);
 void xfs_ag_geom_health(struct xfs_perag *pag, struct xfs_ag_geometry *ageo);
+void xfs_rtgroup_geom_health(struct xfs_rtgroup *rtg,
+		struct xfs_rtgroup_geometry *rgeo);
 void xfs_bulkstat_health(struct xfs_inode *ip, struct xfs_bulkstat *bs);
 
 #define xfs_metadata_is_sick(error) \
diff --git a/libxfs/xfs_rtgroup.c b/libxfs/xfs_rtgroup.c
index f753ed5fc05588..50cfb038f03b79 100644
--- a/libxfs/xfs_rtgroup.c
+++ b/libxfs/xfs_rtgroup.c
@@ -211,6 +211,20 @@ xfs_rtgroup_trans_join(
 	}
 }
 
+/* Retrieve rt group geometry. */
+int
+xfs_rtgroup_get_geometry(
+	struct xfs_rtgroup	*rtg,
+	struct xfs_rtgroup_geometry *rgeo)
+{
+	/* Fill out form. */
+	memset(rgeo, 0, sizeof(*rgeo));
+	rgeo->rg_number = rtg_rgno(rtg);
+	rgeo->rg_length = rtg->rtg_extents * rtg_mount(rtg)->m_sb.sb_rextsize;
+	xfs_rtgroup_geom_health(rtg, rgeo);
+	return 0;
+}
+
 #ifdef CONFIG_PROVE_LOCKING
 static struct lock_class_key xfs_rtginode_lock_class;
 
diff --git a/libxfs/xfs_rtgroup.h b/libxfs/xfs_rtgroup.h
index fba62b26912a89..026f34f984b32f 100644
--- a/libxfs/xfs_rtgroup.h
+++ b/libxfs/xfs_rtgroup.h
@@ -234,6 +234,9 @@ void xfs_rtgroup_unlock(struct xfs_rtgroup *rtg, unsigned int rtglock_flags);
 void xfs_rtgroup_trans_join(struct xfs_trans *tp, struct xfs_rtgroup *rtg,
 		unsigned int rtglock_flags);
 
+int xfs_rtgroup_get_geometry(struct xfs_rtgroup *rtg,
+		struct xfs_rtgroup_geometry *rgeo);
+
 int xfs_rtginode_mkdir_parent(struct xfs_mount *mp);
 int xfs_rtginode_load_parent(struct xfs_trans *tp);
 
@@ -277,6 +280,7 @@ static inline int xfs_initialize_rtgroups(struct xfs_mount *mp,
 # define xfs_rtgroup_trans_join(tp, rtg, gf)	((void)0)
 # define xfs_update_rtsb(bp, sb_bp)	((void)0)
 # define xfs_log_rtsb(tp, sb_bp)	(NULL)
+# define xfs_rtgroup_get_geometry(rtg, rgeo)	(-EOPNOTSUPP)
 #endif /* CONFIG_XFS_RT */
 
 #endif /* __LIBXFS_RTGROUP_H */