From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Now that we have the ability to track sick metadata in-core, make scrub
and repair update those health assessments after doing work.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/Makefile | 1
fs/xfs/scrub/health.c | 176 +++++++++++++++++++++++++++++++++++++++++++++++++
fs/xfs/scrub/health.h | 12 +++
fs/xfs/scrub/scrub.c | 4 +
fs/xfs/scrub/scrub.h | 7 ++
5 files changed, 200 insertions(+)
create mode 100644 fs/xfs/scrub/health.c
create mode 100644 fs/xfs/scrub/health.h
diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index 786379c143f4..b20964e26a22 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -143,6 +143,7 @@ xfs-y += $(addprefix scrub/, \
common.o \
dabtree.o \
dir.o \
+ health.o \
ialloc.o \
inode.o \
parent.o \
diff --git a/fs/xfs/scrub/health.c b/fs/xfs/scrub/health.c
new file mode 100644
index 000000000000..770ab0723a38
--- /dev/null
+++ b/fs/xfs/scrub/health.c
@@ -0,0 +1,176 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_defer.h"
+#include "xfs_btree.h"
+#include "xfs_bit.h"
+#include "xfs_log_format.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_inode.h"
+#include "xfs_health.h"
+#include "scrub/scrub.h"
+#include "scrub/health.h"
+
+/*
+ * Scrub and In-Core Filesystem Health Assessments
+ * ===============================================
+ *
+ * Online scrub and repair have the time and the ability to perform stronger
+ * checks than we can do from the metadata verifiers, because they can
+ * cross-reference records between data structures. Therefore, scrub is in a
+ * good position to update the online filesystem health assessments to reflect
+ * the good/bad state of the data structure.
+ *
+ * We therefore extend scrub in the following ways to achieve this:
+ *
+ * 1. Create a "sick_mask_update" field in the scrub context. When we're
+ * setting up a scrub call, set this to the default XFS_SICK_* flag(s) for the
+ * selected scrub type (call it A). Scrub and repair functions can override
+ * the default sick_mask_update value if they choose.
+ *
+ * 2. If the scrubber returns a runtime error code, we exit making no changes
+ * to the incore sick state.
+ *
+ * 3. If the scrubber finds that A is clean, use sick_mask_update to clear the
+ * incore sick flags before exiting.
+ *
+ * 4. If the scrubber finds that A is corrupt, use sick_mask_update to set the
+ * incore sick flags. If the user didn't want to repair then we exit, leaving
+ * the metadata structure unfixed and the sick flag set.
+ *
+ * 5. Now we know that A is corrupt and the user wants to repair, so run the
+ * repairer. If the repairer returns an error code, we exit with that error
+ * code, having made no further changes to the incore sick state.
+ *
+ * 6. If repair rebuilds A correctly and the subsequent re-scrub of A is
+ * clean, use sick_mask_update to clear the incore sick flags. This should
+ * have the effect that A is no longer marked sick.
+ *
+ * 7. If repair rebuilds A incorrectly, the re-scrub will find it corrupt and
+ * use sick_mask_update to set the incore sick flags. This should have no
+ * externally visible effect since we already set them in step (4).
+ *
+ * There are some complications to this story, however. For certain types of
+ * complementary metadata indices (e.g. inobt/finobt), it is easier to rebuild
+ * both structures at the same time. The following principles apply to this
+ * type of repair strategy:
+ *
+ * 8. Any repair function that rebuilds multiple structures should update
+ * sick_mask_visible to reflect whatever other structures are rebuilt, and
+ * verify that all the rebuilt structures can pass a scrub check. The
+ * outcomes of 5-7 still apply, but with a sick_mask_update that covers
+ * everything being rebuilt.
+ */
+
+/* Map our scrub type to a sick mask and a set of health update functions. */
+
+enum xchk_health_group {
+ XHG_FS = 1,
+ XHG_RT,
+ XHG_AG,
+ XHG_INO,
+};
+
+struct xchk_health_map {
+ enum xchk_health_group group;
+ unsigned int sick_mask;
+};
+
+static const struct xchk_health_map type_to_health_flag[XFS_SCRUB_TYPE_NR] = {
+ [XFS_SCRUB_TYPE_SB] = { XHG_AG, XFS_SICK_AG_SB },
+ [XFS_SCRUB_TYPE_AGF] = { XHG_AG, XFS_SICK_AG_AGF },
+ [XFS_SCRUB_TYPE_AGFL] = { XHG_AG, XFS_SICK_AG_AGFL },
+ [XFS_SCRUB_TYPE_AGI] = { XHG_AG, XFS_SICK_AG_AGI },
+ [XFS_SCRUB_TYPE_BNOBT] = { XHG_AG, XFS_SICK_AG_BNOBT },
+ [XFS_SCRUB_TYPE_CNTBT] = { XHG_AG, XFS_SICK_AG_CNTBT },
+ [XFS_SCRUB_TYPE_INOBT] = { XHG_AG, XFS_SICK_AG_INOBT },
+ [XFS_SCRUB_TYPE_FINOBT] = { XHG_AG, XFS_SICK_AG_FINOBT },
+ [XFS_SCRUB_TYPE_RMAPBT] = { XHG_AG, XFS_SICK_AG_RMAPBT },
+ [XFS_SCRUB_TYPE_REFCNTBT] = { XHG_AG, XFS_SICK_AG_REFCNTBT },
+ [XFS_SCRUB_TYPE_INODE] = { XHG_INO, XFS_SICK_INO_CORE },
+ [XFS_SCRUB_TYPE_BMBTD] = { XHG_INO, XFS_SICK_INO_BMBTD },
+ [XFS_SCRUB_TYPE_BMBTA] = { XHG_INO, XFS_SICK_INO_BMBTA },
+ [XFS_SCRUB_TYPE_BMBTC] = { XHG_INO, XFS_SICK_INO_BMBTC },
+ [XFS_SCRUB_TYPE_DIR] = { XHG_INO, XFS_SICK_INO_DIR },
+ [XFS_SCRUB_TYPE_XATTR] = { XHG_INO, XFS_SICK_INO_XATTR },
+ [XFS_SCRUB_TYPE_SYMLINK] = { XHG_INO, XFS_SICK_INO_SYMLINK },
+ [XFS_SCRUB_TYPE_PARENT] = { XHG_INO, XFS_SICK_INO_PARENT },
+ [XFS_SCRUB_TYPE_RTBITMAP] = { XHG_RT, XFS_SICK_RT_BITMAP },
+ [XFS_SCRUB_TYPE_RTSUM] = { XHG_RT, XFS_SICK_RT_SUMMARY },
+ [XFS_SCRUB_TYPE_UQUOTA] = { XHG_FS, XFS_SICK_FS_UQUOTA },
+ [XFS_SCRUB_TYPE_GQUOTA] = { XHG_FS, XFS_SICK_FS_GQUOTA },
+ [XFS_SCRUB_TYPE_PQUOTA] = { XHG_FS, XFS_SICK_FS_PQUOTA },
+};
+
+/* Return the health status mask for this scrub type. */
+unsigned int
+xchk_health_mask_for_scrub_type(
+ __u32 scrub_type)
+{
+ return type_to_health_flag[scrub_type].sick_mask;
+}
+
+/*
+ * Update filesystem health assessments based on what we found and did.
+ *
+ * If the scrubber finds errors, we mark sick whatever's mentioned in
+ * sick_mask_update, no matter whether this is a first scan or an
+ * evaluation of repair effectiveness.
+ *
+ * Otherwise, no direct corruption was found, so mark whatever's in
+ * sick_mask_update as healthy.
+ */
+void
+xchk_update_health(
+ struct xfs_scrub *sc)
+{
+ struct xfs_perag *pag;
+ bool bad;
+
+ if (!sc->sick_mask_update)
+ return;
+
+ bad = (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT);
+ 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)
+ xfs_ag_mark_sick(pag, sc->sick_mask_update);
+ else
+ xfs_ag_mark_healthy(pag, sc->sick_mask_update);
+ xfs_perag_put(pag);
+ break;
+ case XHG_INO:
+ if (!sc->ip)
+ return;
+ if (bad)
+ xfs_inode_mark_sick(sc->ip, sc->sick_mask_update);
+ else
+ xfs_inode_mark_healthy(sc->ip, sc->sick_mask_update);
+ break;
+ case XHG_FS:
+ if (bad)
+ xfs_fs_mark_sick(sc->mp, sc->sick_mask_update);
+ else
+ xfs_fs_mark_healthy(sc->mp, sc->sick_mask_update);
+ break;
+ case XHG_RT:
+ if (bad)
+ xfs_rt_mark_sick(sc->mp, sc->sick_mask_update);
+ else
+ xfs_rt_mark_healthy(sc->mp, sc->sick_mask_update);
+ break;
+ default:
+ ASSERT(0);
+ break;
+ }
+}
diff --git a/fs/xfs/scrub/health.h b/fs/xfs/scrub/health.h
new file mode 100644
index 000000000000..fd0d466c8658
--- /dev/null
+++ b/fs/xfs/scrub/health.h
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
+ */
+#ifndef __XFS_SCRUB_HEALTH_H__
+#define __XFS_SCRUB_HEALTH_H__
+
+unsigned int xchk_health_mask_for_scrub_type(__u32 scrub_type);
+void xchk_update_health(struct xfs_scrub *sc);
+
+#endif /* __XFS_SCRUB_HEALTH_H__ */
diff --git a/fs/xfs/scrub/scrub.c b/fs/xfs/scrub/scrub.c
index 02d278b7d20b..01d5bfc1917c 100644
--- a/fs/xfs/scrub/scrub.c
+++ b/fs/xfs/scrub/scrub.c
@@ -40,6 +40,7 @@
#include "scrub/trace.h"
#include "scrub/btree.h"
#include "scrub/repair.h"
+#include "scrub/health.h"
/*
* Online Scrub and Repair
@@ -498,6 +499,7 @@ xfs_scrub_metadata(
xchk_experimental_warning(mp);
sc.ops = &meta_scrub_ops[sm->sm_type];
+ sc.sick_mask_update = xchk_health_mask_for_scrub_type(sm->sm_type);
retry_op:
/* Set up for the operation. */
error = sc.ops->setup(&sc, ip);
@@ -520,6 +522,8 @@ xfs_scrub_metadata(
} else if (error)
goto out_teardown;
+ xchk_update_health(&sc);
+
if ((sc.sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR) &&
!(sc.flags & XREP_ALREADY_FIXED)) {
bool needs_fix;
diff --git a/fs/xfs/scrub/scrub.h b/fs/xfs/scrub/scrub.h
index 1b23bf141438..b1d632f1c5ff 100644
--- a/fs/xfs/scrub/scrub.h
+++ b/fs/xfs/scrub/scrub.h
@@ -66,6 +66,13 @@ struct xfs_scrub {
/* See the XCHK/XREP state flags below. */
unsigned int flags;
+ /*
+ * The XFS_SICK_* flags that correspond to the metadata being scrubbed
+ * or repaired. We will use this mask to update the in-core fs health
+ * status with whatever we find.
+ */
+ unsigned int sick_mask_update;
+
/* State tracking for single-AG operations. */
struct xchk_ag sa;
};
