[Cluster-devel] [GFS2 PATCH 25/39] gfs2: flesh out delayed withdraw for gfs2_log_flush

[Bob Peterson]

Function gfs2_log_flush() had a few places where it tried to withdraw
from the file system when errors were encountered. The problem is,
it should delay those withdraws until the log flush lock is no longer
held.

This patch creates a new function just for delayed withdraws for
situations like this. If errors=panic was specified on mount, we
still want to do it the old fashioned way because the panic it does
not help to delay in that situation.

Signed-off-by: Bob Peterson <rpeterso at redhat.com>
Reviewed-by: Andreas Gruenbacher <agruenba at redhat.com>
---
 fs/gfs2/log.c  | 12 ++++++++----
 fs/gfs2/util.c | 27 +++++++++++++++++++++------
 fs/gfs2/util.h | 14 ++++++++++++--
 3 files changed, 41 insertions(+), 12 deletions(-)

diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 010c319caade..67465a34954e 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -872,13 +872,17 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags)
 		INIT_LIST_HEAD(&tr->tr_ail2_list);
 		tr->tr_first = sdp->sd_log_flush_head;
 		if (unlikely (state == SFS_FROZEN))
-			gfs2_assert_withdraw(sdp, !tr->tr_num_buf_new && !tr->tr_num_databuf_new);
+			if (gfs2_assert_withdraw_delayed(sdp,
+			       !tr->tr_num_buf_new && !tr->tr_num_databuf_new))
+				goto out;
 	}
 
 	if (unlikely(state == SFS_FROZEN))
-		gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
-	gfs2_assert_withdraw(sdp,
-			sdp->sd_log_num_revoke == sdp->sd_log_committed_revoke);
+		if (gfs2_assert_withdraw_delayed(sdp, !sdp->sd_log_num_revoke))
+			goto out;
+	if (gfs2_assert_withdraw_delayed(sdp,
+			sdp->sd_log_num_revoke == sdp->sd_log_committed_revoke))
+		goto out;
 
 	gfs2_ordered_write(sdp);
 	if (gfs2_withdrawn(sdp))
diff --git a/fs/gfs2/util.c b/fs/gfs2/util.c
index 20a5860841e2..9b64d40ab379 100644
--- a/fs/gfs2/util.c
+++ b/fs/gfs2/util.c
@@ -318,13 +318,28 @@ int gfs2_withdraw(struct gfs2_sbd *sdp)
  */
 
 void gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
-			    const char *function, char *file, unsigned int line)
+			    const char *function, char *file, unsigned int line,
+			    bool delayed)
 {
-	gfs2_lm(sdp,
-		"fatal: assertion \"%s\" failed\n"
-		"   function = %s, file = %s, line = %u\n",
-		assertion, function, file, line);
-	gfs2_withdraw(sdp);
+	if (gfs2_withdrawn(sdp))
+		return;
+
+	fs_err(sdp,
+	       "fatal: assertion \"%s\" failed\n"
+	       "   function = %s, file = %s, line = %u\n",
+	       assertion, function, file, line);
+
+	/*
+	 * If errors=panic was specified on mount, it won't help to delay the
+	 * withdraw.
+	 */
+	if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
+		delayed = false;
+
+	if (delayed)
+		gfs2_withdraw_delayed(sdp);
+	else
+		gfs2_withdraw(sdp);
 	dump_stack();
 }
 
diff --git a/fs/gfs2/util.h b/fs/gfs2/util.h
index 97117a766bde..a3542560da6f 100644
--- a/fs/gfs2/util.h
+++ b/fs/gfs2/util.h
@@ -37,14 +37,24 @@ do { \
 
 
 void gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
-			    const char *function, char *file, unsigned int line);
+			    const char *function, char *file, unsigned int line,
+			    bool delayed);
 
 #define gfs2_assert_withdraw(sdp, assertion) \
 	({ \
 		bool _bool = (assertion); \
 		if (unlikely(!_bool)) \
 			gfs2_assert_withdraw_i((sdp), #assertion, \
-					__func__, __FILE__, __LINE__); \
+					__func__, __FILE__, __LINE__, false); \
+		!_bool; \
+	})
+
+#define gfs2_assert_withdraw_delayed(sdp, assertion) \
+	({ \
+		bool _bool = (assertion); \
+		if (unlikely(!_bool)) \
+			gfs2_assert_withdraw_i((sdp), #assertion, \
+					__func__, __FILE__, __LINE__, true); \
 		!_bool; \
 	})
 
-- 
2.25.1