linux-ext4 - [PATCH v2] debugfs/logdump.c: Add parameter t to dump sequence commit timestamps

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Message-ID: <5a4b703c-6940-d9da-5686-337e3220d3a4@huawei.com>
Date: Tue, 17 Jun 2025 20:43:51 +0800
From: zhanchengbin <zhanchengbin1@...wei.com>
To: Theodore Ts'o <tytso@....edu>
CC: <linux-ext4@...r.kernel.org>, <qiangxiaojun@...wei.com>,
	<hejie3@...wei.com>
Subject: [PATCH v2] debugfs/logdump.c: Add parameter t to dump sequence commit
 timestamps

When filesystem errors occur, inspect journal sequences with parameter t to
dump commit timestamps.

Signed-off-by: zhanchengbin <zhanchengbin1@...wei.com>
---
v2: Correct abnormal formats in the patch.
- Link to v1:
https://patchwork.ozlabs.org/project/linux-ext4/patch/50aeb0c1-9f14-ed04-c3b7-7a50f61c3341@huawei.com/
---
  debugfs/logdump.c | 63 ++++++++++++++++++++++++++++++++++++++++-------
  1 file changed, 54 insertions(+), 9 deletions(-)

diff --git a/debugfs/logdump.c b/debugfs/logdump.c
index 324ed42..3dcae31 100644
--- a/debugfs/logdump.c
+++ b/debugfs/logdump.c
@@ -47,7 +47,7 @@ enum journal_location {JOURNAL_IS_INTERNAL, 
JOURNAL_IS_EXTERNAL};

  #define ANY_BLOCK ((blk64_t) -1)

-static int		dump_all, dump_super, dump_old, dump_contents, 
dump_descriptors;
+static int		dump_all, dump_super, dump_old, dump_contents, 
dump_descriptors, dump_time;
  static int64_t		dump_counts;
  static blk64_t		block_to_dump, bitmap_to_dump, inode_block_to_dump;
  static unsigned int	group_to_dump, inode_offset_to_dump;
@@ -67,6 +67,8 @@ static void dump_descriptor_block(FILE *, struct 
journal_source *,
  				  char *, journal_superblock_t *,
  				  unsigned int *, unsigned int, __u32, tid_t);

+static void dump_commit_time(FILE *out_file, char *buf);
+
  static void dump_revoke_block(FILE *, char *, journal_superblock_t *,
  				  unsigned int, unsigned int, tid_t);

@@ -118,10 +120,11 @@ void do_logdump(int argc, ss_argv_t argv, int 
sci_idx EXT2FS_ATTR((unused)),
  	inode_block_to_dump = ANY_BLOCK;
  	inode_to_dump = -1;
  	dump_counts = -1;
+	dump_time = 0;
  	wrapped_flag = false;

  	reset_getopt();
-	while ((c = getopt (argc, argv, "ab:ci:f:OsSn:")) != EOF) {
+	while ((c = getopt (argc, argv, "ab:ci:f:OsSn:t")) != EOF) {
  		switch (c) {
  		case 'a':
  			dump_all++;
@@ -162,6 +165,9 @@ void do_logdump(int argc, ss_argv_t argv, int 
sci_idx EXT2FS_ATTR((unused)),
  				return;
  			}
  			break;
+		case 't':
+			dump_time++;
+			break;
  		default:
  			goto print_usage;
  		}
@@ -521,21 +527,33 @@ static void dump_journal(char *cmdname, FILE 
*out_file,
  				break;
  		}

-		if (dump_descriptors) {
-			fprintf (out_file, "Found expected sequence %u, "
-				 "type %u (%s) at block %u\n",
-				 sequence, blocktype,
-				 type_to_name(blocktype), blocknr);
-		}
-
  		switch (blocktype) {
  		case JBD2_DESCRIPTOR_BLOCK:
+			if (dump_descriptors) {
+				fprintf (out_file, "Found expected sequence %u, "
+					 "type %u (%s) at block %u\n",
+					 sequence, blocktype,
+					 type_to_name(blocktype), blocknr);
+			}
+
  			dump_descriptor_block(out_file, source, buf, jsb,
  					      &blocknr, blocksize, maxlen,
  					      transaction);
  			continue;

  		case JBD2_COMMIT_BLOCK:
+			if (dump_descriptors) {
+				fprintf (out_file, "Found expected sequence %u, "
+					 "type %u (%s) at block %u",
+					 sequence, blocktype,
+					 type_to_name(blocktype), blocknr);
+			}
+
+			if (dump_time)
+				dump_commit_time(out_file, buf);
+
+			fprintf(out_file, "\n");
+
  			cur_counts++;
  			transaction++;
  			blocknr++;
@@ -543,6 +561,13 @@ static void dump_journal(char *cmdname, FILE *out_file,
  			continue;

  		case JBD2_REVOKE_BLOCK:
+			if (dump_descriptors) {
+				fprintf (out_file, "Found expected sequence %u, "
+					 "type %u (%s) at block %u\n",
+					 sequence, blocktype,
+					 type_to_name(blocktype), blocknr);
+			}
+
  			dump_revoke_block(out_file, buf, jsb,
  					  blocknr, blocksize,
  					  transaction);
@@ -742,6 +767,26 @@ static void dump_descriptor_block(FILE *out_file,
  	*blockp = blocknr;
  }

+static void dump_commit_time(FILE *out_file, char *buf)
+{
+	struct commit_header	*header;
+	__be64		commit_sec;
+	time_t		timestamp;
+	struct tm	timeinfo;
+
+	header = (struct commit_header *)buf;
+	commit_sec = be64_to_cpu(header->h_commit_sec);
+
+	timestamp = commit_sec;
+	gmtime_r(&timestamp, &timeinfo);
+	fprintf(out_file, ", commit at UTC: %04d-%02d-%02d %02d:%02d:%02d",
+		timeinfo.tm_year + 1900,
+		timeinfo.tm_mon + 1,
+		timeinfo.tm_mday,
+		timeinfo.tm_hour,
+		timeinfo.tm_min,
+		timeinfo.tm_sec);
+}

  static void dump_revoke_block(FILE *out_file, char *buf,
  			      journal_superblock_t *jsb EXT2FS_ATTR((unused)),
-- 
2.33.0