On Wed, Jul 02, 2025 at 11:46:15AM +0800, zhanchengbin wrote:
When filesystem errors occur, inspect journal sequences with parameter t to
dump commit timestamps.
Signed-off-by: zhanchengbin <zhanchengbin1@xxxxxxxxxx>
---
v3: Change from displaying UTC time to local time.
- Link to v2:
https://patchwork.ozlabs.org/project/linux-ext4/patch/5a4b703c-6940-d9da-5686-337e3220d3a4@xxxxxxxxxx/
v2: Correct abnormal formats in the patch.
- Link to v1:
https://patchwork.ozlabs.org/project/linux-ext4/patch/50aeb0c1-9f14-ed04-c3b7-7a50f61c3341@xxxxxxxxxx/
---
debugfs/logdump.c | 61 ++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 52 insertions(+), 9 deletions(-)
diff --git a/debugfs/logdump.c b/debugfs/logdump.c
index 324ed42..ce87419 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;
Heh, ok, I forgot that this is a debugfs subcommand so initializing this
to zero here is totally correct. Sorry for that noise in v2 :)
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);
+ else
+ 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 +767,24 @@ 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;
+ char time_buffer[26];
+ char *result;
+
+ header = (struct commit_header *)buf;
+ commit_sec = be64_to_cpu(header->h_commit_sec);
Nit: be64_to_cpu returns host-endian values, so commit_sec should have
type uint64_t, not __be64.
+
+ timestamp = commit_sec;
+ result = ctime_r(×tamp, time_buffer);
+ if (result == NULL) {
+ exit (1);
A failed attempt to render the timestamp shouldn't abort all of debugfs.
I suggest:
if (result)
fprintf(out_file, ", commit at: %s", time_buffer);
else
fprintf(out_file, ", commit at: %llu", commit_sec);
So at least you get the raw output.
--D
