xfs: update health status if we get a clean bill of healthindirect-health-reporting_2020-06-01

If scrub finds that everything is ok with the filesystem, we need a way
to tell the health tracking that it can let go of indirect health flags,
since indirect flags only mean that at some point in the past we lost
some context.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

6 files changed, 83 insertions, 2 deletions

diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index f2e9656fdd72..c072fc5d3d53 100644
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -712,9 +712,10 @@ struct xfs_scrub_metadata {
 #define XFS_SCRUB_TYPE_GQUOTA	22	/* group quotas */
 #define XFS_SCRUB_TYPE_PQUOTA	23	/* project quotas */
 #define XFS_SCRUB_TYPE_FSCOUNTERS 24	/* fs summary counters */
+#define XFS_SCRUB_TYPE_HEALTHY	25	/* everything checked out ok */
 
 /* Number of scrub subcommands. */
-#define XFS_SCRUB_TYPE_NR	25
+#define XFS_SCRUB_TYPE_NR	26
 
 /* i: Repair this metadata. */
 #define XFS_SCRUB_IFLAG_REPAIR		(1 << 0)
diff --git a/fs/xfs/scrub/health.c b/fs/xfs/scrub/health.c
index d6345e547422..a8d562753334 100644
--- a/fs/xfs/scrub/health.c
+++ b/fs/xfs/scrub/health.c
@@ -7,11 +7,14 @@
 #include "xfs_fs.h"
 #include "xfs_shared.h"
 #include "xfs_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
 #include "xfs_btree.h"
 #include "xfs_sb.h"
 #include "xfs_health.h"
 #include "scrub/scrub.h"
 #include "scrub/health.h"
+#include "scrub/common.h"
 
 /*
  * Scrub and In-Core Filesystem Health Assessments
@@ -114,6 +117,28 @@ xchk_health_mask_for_scrub_type(
 }
 
 /*
+ * Scrub gave the filesystem a clean bill of health, so clear all the indirect
+ * markers of past problems (at least for the fs and ags) so that we can be
+ * healthy again.
+ */
+STATIC void
+xchk_mark_all_healthy(
+	struct xfs_mount	*mp)
+{
+	struct xfs_perag	*pag;
+	xfs_agnumber_t		agno;
+	int			error = 0;
+
+	xfs_fs_mark_healthy(mp, XFS_SICK_FS_INDIRECT);
+	xfs_rt_mark_healthy(mp, XFS_SICK_RT_INDIRECT);
+	for (agno = 0; error == 0 && agno < mp->m_sb.sb_agcount; agno++) {
+		pag = xfs_perag_get(mp, agno);
+		xfs_ag_mark_healthy(pag, XFS_SICK_AG_INDIRECT);
+		xfs_perag_put(pag);
+	}
+}
+
+/*
  * Update filesystem health assessments based on what we found and did.
  *
  * If the scrubber finds errors, we mark sick whatever's mentioned in
@@ -130,6 +155,18 @@ xchk_update_health(
 	struct xfs_perag	*pag;
 	bool			bad;
 
+	/*
+	 * The HEALTHY scrub type is a request from userspace to clear all the
+	 * indirect flags after a clean scan of the entire filesystem.  As such
+	 * there's no sick flag defined for it, so we branch here ahead of the
+	 * mask check.
+	 */
+	if (sc->sm->sm_type == XFS_SCRUB_TYPE_HEALTHY &&
+	    !(sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)) {
+		xchk_mark_all_healthy(sc->mp);
+		return;
+	}
+
 	if (!sc->sick_mask)
 		return;
 
@@ -252,3 +289,37 @@ xchk_ag_btree_healthy_enough(
 
 	return true;
 }
+
+/*
+ * Quick scan to double-check that there isn't any evidence of lingering
+ * primary health problems.  If we're still clear, then the health update will
+ * take care of clearing the indirect evidence.
+ */
+int
+xchk_health_record(
+	struct xfs_scrub	*sc)
+{
+	struct xfs_mount	*mp = sc->mp;
+	struct xfs_perag	*pag;
+	xfs_agnumber_t		agno;
+	unsigned int		sick;
+	unsigned int		checked;
+
+	xfs_fs_measure_sickness(mp, &sick, &checked);
+	if (sick & XFS_SICK_FS_PRIMARY)
+		xchk_set_corrupt(sc);
+
+	xfs_rt_measure_sickness(mp, &sick, &checked);
+	if (sick & XFS_SICK_RT_PRIMARY)
+		xchk_set_corrupt(sc);
+
+	for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
+		pag = xfs_perag_get(mp, agno);
+		xfs_ag_measure_sickness(pag, &sick, &checked);
+		if (sick & XFS_SICK_AG_PRIMARY)
+			xchk_set_corrupt(sc);
+		xfs_perag_put(pag);
+	}
+
+	return 0;
+}
diff --git a/fs/xfs/scrub/health.h b/fs/xfs/scrub/health.h
index d0b938d3d028..ee80b663cfab 100644
--- a/fs/xfs/scrub/health.h
+++ b/fs/xfs/scrub/health.h
@@ -10,5 +10,6 @@ unsigned int xchk_health_mask_for_scrub_type(__u32 scrub_type);
 void xchk_update_health(struct xfs_scrub *sc);
 bool xchk_ag_btree_healthy_enough(struct xfs_scrub *sc, struct xfs_perag *pag,
 		xfs_btnum_t btnum);
+int xchk_health_record(struct xfs_scrub *sc);
 
 #endif /* __XFS_SCRUB_HEALTH_H__ */
diff --git a/fs/xfs/scrub/repair.c b/fs/xfs/scrub/repair.c
index d59523685b64..4bbd8b5d1ef6 100644
--- a/fs/xfs/scrub/repair.c
+++ b/fs/xfs/scrub/repair.c
@@ -30,6 +30,7 @@
 #include "xfs_extfree_item.h"
 #include "xfs_attr.h"
 #include "xfs_reflink.h"
+#include "xfs_health.h"
 #include "scrub/scrub.h"
 #include "scrub/common.h"
 #include "scrub/trace.h"
diff --git a/fs/xfs/scrub/scrub.c b/fs/xfs/scrub/scrub.c
index e42df2401eda..d3c0c67f6216 100644
--- a/fs/xfs/scrub/scrub.c
+++ b/fs/xfs/scrub/scrub.c
@@ -350,6 +350,12 @@ static const struct xchk_meta_ops meta_scrub_ops[] = {
 		.scrub	= xchk_fscounters,
 		.repair	= xrep_notsupported,
 	},
+	[XFS_SCRUB_TYPE_HEALTHY] = {	/* fs healthy; clean all reminders */
+		.type	= ST_FS,
+		.setup	= xchk_setup_fs,
+		.scrub	= xchk_health_record,
+		.repair = xrep_notsupported,
+	},
 };
 
 /* This isn't a stable feature, warn once per day. */
diff --git a/fs/xfs/scrub/trace.h b/fs/xfs/scrub/trace.h
index 9b3e192b6dbc..54c289a070a9 100644
--- a/fs/xfs/scrub/trace.h
+++ b/fs/xfs/scrub/trace.h
@@ -77,7 +77,8 @@ TRACE_DEFINE_ENUM(XFS_SCRUB_TYPE_FSCOUNTERS);
 	{ XFS_SCRUB_TYPE_UQUOTA,	"usrquota" }, \
 	{ XFS_SCRUB_TYPE_GQUOTA,	"grpquota" }, \
 	{ XFS_SCRUB_TYPE_PQUOTA,	"prjquota" }, \
-	{ XFS_SCRUB_TYPE_FSCOUNTERS,	"fscounters" }
+	{ XFS_SCRUB_TYPE_FSCOUNTERS,	"fscounters" }, \
+	{ XFS_SCRUB_TYPE_HEALTHY,	"healthy" }
 
 DECLARE_EVENT_CLASS(xchk_class,
 	TP_PROTO(struct xfs_inode *ip, struct xfs_scrub_metadata *sm,