[PATCH 4/4] xfs_repair: add post-phase error injection points

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

Create an error injection point so that we can simulate repair failing
after a certain phase.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
---
 repair/globals.c    |    3 +++
 repair/globals.h    |    3 +++
 repair/xfs_repair.c |    8 ++++++++
 3 files changed, 14 insertions(+)


diff --git a/repair/globals.c b/repair/globals.c
index 110d98b6..537d068b 100644
--- a/repair/globals.c
+++ b/repair/globals.c
@@ -117,3 +117,6 @@ uint64_t	*prog_rpt_done;
 
 int		ag_stride;
 int		thread_count;
+
+/* If nonzero, simulate failure after this phase. */
+int		fail_after_phase;
diff --git a/repair/globals.h b/repair/globals.h
index 1d397b35..a9287320 100644
--- a/repair/globals.h
+++ b/repair/globals.h
@@ -162,4 +162,7 @@ extern uint64_t		*prog_rpt_done;
 extern int		ag_stride;
 extern int		thread_count;
 
+/* If nonzero, simulate failure after this phase. */
+extern int		fail_after_phase;
+
 #endif /* _XFS_REPAIR_GLOBAL_H */
diff --git a/repair/xfs_repair.c b/repair/xfs_repair.c
index a9236bb7..64d7607f 100644
--- a/repair/xfs_repair.c
+++ b/repair/xfs_repair.c
@@ -362,6 +362,10 @@ process_args(int argc, char **argv)
 
 	if (report_corrected && no_modify)
 		usage();
+
+	p = getenv("XFS_REPAIR_FAIL_AFTER_PHASE");
+	if (p)
+		fail_after_phase = (int)strtol(p, NULL, 0);
 }
 
 void __attribute__((noreturn))
@@ -853,6 +857,10 @@ static inline void
 phase_end(int phase)
 {
 	timestamp(PHASE_END, phase, NULL);
+
+	/* Fail if someone injected an post-phase error. */
+	if (fail_after_phase && phase == fail_after_phase)
+		platform_crash();
 }
 
 int