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Message-ID: <89f57321-28f6-7348-0170-ca62890248c9@huawei.com>
Date: Thu, 3 Jul 2025 19:42:35 +0800
From: zhanchengbin <zhanchengbin1@...wei.com>
To: "Darrick J. Wong" <djwong@...nel.org>
CC: Theodore Ts'o <tytso@....edu>, <linux-ext4@...r.kernel.org>,
<qiangxiaojun@...wei.com>, <hejie3@...wei.com>
Subject: Re: [PATCH v3] debugfs/logdump.c: Add parameter t to dump sequence
commit timestamps
On 2025/7/2 23:19, Darrick J. Wong wrote:
> 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@...wei.com>
>> ---
>> 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@huawei.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 | 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
Thanks for reviewing. 👍
- bin.
>
>> + }
>> + fprintf(out_file, ", commit at: %s", time_buffer);
>> +}
>>
>> static void dump_revoke_block(FILE *out_file, char *buf,
>> journal_superblock_t *jsb EXT2FS_ATTR((unused)),
>> --
>> 2.33.0
>>
>>
>>
>
> .
>
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