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list_journal: Add -n for number of entries to print

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The entire journal can be too big to fit in memory in textual form,
making grep difficult: this adds an option to print a specific number of
journal entries.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
This commit is contained in:
Kent Overstreet 2022-04-12 16:38:10 -04:00
parent ca4bb4155a
commit c25cc1b531
1 changed files with 10 additions and 1 deletions
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11
cmd_debug.c
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@ -578,6 +578,7 @@ static void list_journal_usage(void)
"\n" "\n"
"Options:\n" "Options:\n"
" -a Read entire journal, not just dirty entries\n" " -a Read entire journal, not just dirty entries\n"
" -n Number of journal entries to print, starting from the most recent\n"
" -h Display this help and exit\n" " -h Display this help and exit\n"
"Report bugs to <linux-bcache@vger.kernel.org>"); "Report bugs to <linux-bcache@vger.kernel.org>");
} }
@ -596,6 +597,7 @@ static void star_start_of_lines(char *buf)
int cmd_list_journal(int argc, char *argv[]) int cmd_list_journal(int argc, char *argv[])
{ {
struct bch_opts opts = bch2_opts_empty(); struct bch_opts opts = bch2_opts_empty();
u32 nr_entries = U32_MAX;
int opt; int opt;
opt_set(opts, nochanges, true); opt_set(opts, nochanges, true);
@ -606,11 +608,15 @@ int cmd_list_journal(int argc, char *argv[])
opt_set(opts, keep_journal, true); opt_set(opts, keep_journal, true);
opt_set(opts, read_journal_only,true); opt_set(opts, read_journal_only,true);
while ((opt = getopt(argc, argv, "ah")) != -1) while ((opt = getopt(argc, argv, "an:h")) != -1)
switch (opt) { switch (opt) {
case 'a': case 'a':
opt_set(opts, read_entire_journal, true); opt_set(opts, read_entire_journal, true);
break; break;
case 'n':
nr_entries = kstrtouint(optarg, 10, &nr_entries);
opt_set(opts, read_entire_journal, true);
break;
case 'h': case 'h':
list_journal_usage(); list_journal_usage();
exit(EXIT_SUCCESS); exit(EXIT_SUCCESS);
@ -634,6 +640,9 @@ int cmd_list_journal(int argc, char *argv[])
if (!p) if (!p)
continue; continue;
if (le64_to_cpu(p->j.seq) + nr_entries < atomic64_read(&c->journal.seq))
continue;
bool blacklisted = bool blacklisted =
bch2_journal_seq_is_blacklisted(c, bch2_journal_seq_is_blacklisted(c,
le64_to_cpu(p->j.seq), false); le64_to_cpu(p->j.seq), false);