xfs: separate the marking of sick and checked metadata

Split the setting of the sick and checked masks into separate functions
as part of preparing to add the ability for regular runtime fs code
(i.e. not scrub) to mark metadata structures sick when corruptions are
found.  Improve the documentation of libxfs' requirements for helper
behavior.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>

4 files changed, 81 insertions, 11 deletions

diff --git a/fs/xfs/libxfs/xfs_health.h b/fs/xfs/libxfs/xfs_health.h
index 5571f6cb2539..aa4771fad505 100644
--- a/fs/xfs/libxfs/xfs_health.h
+++ b/fs/xfs/libxfs/xfs_health.h
@@ -101,24 +101,38 @@ struct xfs_fsop_geom;
 				 XFS_SICK_INO_SYMLINK | \
 				 XFS_SICK_INO_PARENT)
 
-/* These functions must be provided by the xfs implementation. */
+/*
+ * These functions must be provided by the xfs implementation.  Function
+ * behavior with respect to the first argument should be as follows:
+ *
+ * xfs_*_mark_sick:    set the sick flags and do not set checked flags.
+ * xfs_*_mark_checked: set the checked flags.
+ * xfs_*_mark_healthy: clear the sick flags and set the checked flags.
+ *
+ * xfs_*_measure_sickness: return the sick and check status in the provided
+ * out parameters.
+ */
 
 void xfs_fs_mark_sick(struct xfs_mount *mp, unsigned int mask);
+void xfs_fs_mark_checked(struct xfs_mount *mp, unsigned int mask);
 void xfs_fs_mark_healthy(struct xfs_mount *mp, unsigned int mask);
 void xfs_fs_measure_sickness(struct xfs_mount *mp, unsigned int *sick,
 		unsigned int *checked);
 
 void xfs_rt_mark_sick(struct xfs_mount *mp, unsigned int mask);
+void xfs_rt_mark_checked(struct xfs_mount *mp, unsigned int mask);
 void xfs_rt_mark_healthy(struct xfs_mount *mp, unsigned int mask);
 void xfs_rt_measure_sickness(struct xfs_mount *mp, unsigned int *sick,
 		unsigned int *checked);
 
 void xfs_ag_mark_sick(struct xfs_perag *pag, unsigned int mask);
+void xfs_ag_mark_checked(struct xfs_perag *pag, unsigned int mask);
 void xfs_ag_mark_healthy(struct xfs_perag *pag, unsigned int mask);
 void xfs_ag_measure_sickness(struct xfs_perag *pag, unsigned int *sick,
 		unsigned int *checked);
 
 void xfs_inode_mark_sick(struct xfs_inode *ip, unsigned int mask);
+void xfs_inode_mark_checked(struct xfs_inode *ip, unsigned int mask);
 void xfs_inode_mark_healthy(struct xfs_inode *ip, unsigned int mask);
 void xfs_inode_measure_sickness(struct xfs_inode *ip, unsigned int *sick,
 		unsigned int *checked);
diff --git a/fs/xfs/scrub/health.c b/fs/xfs/scrub/health.c
index 6749930b50a2..e5cc89d43808 100644
--- a/fs/xfs/scrub/health.c
+++ b/fs/xfs/scrub/health.c
@@ -144,30 +144,34 @@ xchk_update_health(
 	switch (type_to_health_flag[sc->sm->sm_type].group) {
 	case XHG_AG:
 		pag = xfs_perag_get(sc->mp, sc->sm->sm_agno);
-		if (bad)
+		if (bad) {
 			xfs_ag_mark_sick(pag, sc->sick_mask);
-		else
+			xfs_ag_mark_checked(pag, sc->sick_mask);
+		} else
 			xfs_ag_mark_healthy(pag, sc->sick_mask);
 		xfs_perag_put(pag);
 		break;
 	case XHG_INO:
 		if (!sc->ip)
 			return;
-		if (bad)
+		if (bad) {
 			xfs_inode_mark_sick(sc->ip, sc->sick_mask);
-		else
+			xfs_inode_mark_checked(sc->ip, sc->sick_mask);
+		} else
 			xfs_inode_mark_healthy(sc->ip, sc->sick_mask);
 		break;
 	case XHG_FS:
-		if (bad)
+		if (bad) {
 			xfs_fs_mark_sick(sc->mp, sc->sick_mask);
-		else
+			xfs_fs_mark_checked(sc->mp, sc->sick_mask);
+		} else
 			xfs_fs_mark_healthy(sc->mp, sc->sick_mask);
 		break;
 	case XHG_RT:
-		if (bad)
+		if (bad) {
 			xfs_rt_mark_sick(sc->mp, sc->sick_mask);
-		else
+			xfs_rt_mark_checked(sc->mp, sc->sick_mask);
+		} else
 			xfs_rt_mark_healthy(sc->mp, sc->sick_mask);
 		break;
 	default:
diff --git a/fs/xfs/xfs_health.c b/fs/xfs/xfs_health.c
index 9cf933a8f532..3ef91601bc2b 100644
--- a/fs/xfs/xfs_health.c
+++ b/fs/xfs/xfs_health.c
@@ -98,6 +98,18 @@ xfs_fs_mark_sick(
 
 	spin_lock(&mp->m_sb_lock);
 	mp->m_fs_sick |= mask;
+	spin_unlock(&mp->m_sb_lock);
+}
+
+/* Mark per-fs metadata as having been checked. */
+void
+xfs_fs_mark_checked(
+	struct xfs_mount	*mp,
+	unsigned int		mask)
+{
+	ASSERT(!(mask & ~XFS_SICK_FS_PRIMARY));
+
+	spin_lock(&mp->m_sb_lock);
 	mp->m_fs_checked |= mask;
 	spin_unlock(&mp->m_sb_lock);
 }
@@ -141,6 +153,19 @@ xfs_rt_mark_sick(
 
 	spin_lock(&mp->m_sb_lock);
 	mp->m_rt_sick |= mask;
+	spin_unlock(&mp->m_sb_lock);
+}
+
+/* Mark realtime metadata as having been checked. */
+void
+xfs_rt_mark_checked(
+	struct xfs_mount	*mp,
+	unsigned int		mask)
+{
+	ASSERT(!(mask & ~XFS_SICK_RT_PRIMARY));
+	trace_xfs_rt_mark_sick(mp, mask);
+
+	spin_lock(&mp->m_sb_lock);
 	mp->m_rt_checked |= mask;
 	spin_unlock(&mp->m_sb_lock);
 }
@@ -184,6 +209,18 @@ xfs_ag_mark_sick(
 
 	spin_lock(&pag->pag_state_lock);
 	pag->pag_sick |= mask;
+	spin_unlock(&pag->pag_state_lock);
+}
+
+/* Mark per-ag metadata as having been checked. */
+void
+xfs_ag_mark_checked(
+	struct xfs_perag	*pag,
+	unsigned int		mask)
+{
+	ASSERT(!(mask & ~XFS_SICK_AG_PRIMARY));
+
+	spin_lock(&pag->pag_state_lock);
 	pag->pag_checked |= mask;
 	spin_unlock(&pag->pag_state_lock);
 }
@@ -227,7 +264,6 @@ xfs_inode_mark_sick(
 
 	spin_lock(&ip->i_flags_lock);
 	ip->i_sick |= mask;
-	ip->i_checked |= mask;
 	spin_unlock(&ip->i_flags_lock);
 
 	/*
@@ -240,6 +276,19 @@ xfs_inode_mark_sick(
 	spin_unlock(&VFS_I(ip)->i_lock);
 }
 
+/* Mark inode metadata as having been checked. */
+void
+xfs_inode_mark_checked(
+	struct xfs_inode	*ip,
+	unsigned int		mask)
+{
+	ASSERT(!(mask & ~XFS_SICK_INO_PRIMARY));
+
+	spin_lock(&ip->i_flags_lock);
+	ip->i_checked |= mask;
+	spin_unlock(&ip->i_flags_lock);
+}
+
 /* Mark parts of an inode healed. */
 void
 xfs_inode_mark_healthy(
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index e665adbb0ae3..c7bba1662914 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -494,8 +494,10 @@ xfs_check_summary_counts(
 	if (xfs_is_clean(mp) &&
 	    (mp->m_sb.sb_fdblocks > mp->m_sb.sb_dblocks ||
 	     !xfs_verify_icount(mp, mp->m_sb.sb_icount) ||
-	     mp->m_sb.sb_ifree > mp->m_sb.sb_icount))
+	     mp->m_sb.sb_ifree > mp->m_sb.sb_icount)) {
 		xfs_fs_mark_sick(mp, XFS_SICK_FS_COUNTERS);
+		xfs_fs_mark_checked(mp, XFS_SICK_FS_COUNTERS);
+	}
 
 	/*
 	 * We can safely re-initialise incore superblock counters from the
@@ -1254,6 +1256,7 @@ xfs_force_summary_recalc(
 		return;
 
 	xfs_fs_mark_sick(mp, XFS_SICK_FS_COUNTERS);
+	xfs_fs_mark_checked(mp, XFS_SICK_FS_COUNTERS);
 }
 
 /*