For kernel operation we have METADATA/FUA/FLUSH flags as a beacon, but
for user space write we don't have any useful flag unless the user space
tool call fsync() to generate a FLUSH bio.
This means for user space write, we don't really have an equivalent of
--next-fua to find super block write.
So this patch will add a new option, --next-write <sector> to
replay/find next write to certain sector.
And normally the <sector> should be super block sector number.
With that, we can replay to super block write even it's user space
triggering the write.
Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
---
src/log-writes/replay-log.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/src/log-writes/replay-log.c b/src/log-writes/replay-log.c
index c16df40e5741..0d0ec49c8a00 100644
--- a/src/log-writes/replay-log.c
+++ b/src/log-writes/replay-log.c
@@ -9,6 +9,7 @@
enum option_indexes {
NEXT_FLUSH,
NEXT_FUA,
+ NEXT_WRITE,
START_ENTRY,
END_MARK,
LOG,
@@ -28,6 +29,7 @@ enum option_indexes {
static struct option long_options[] = {
{"next-flush", no_argument, NULL, 0},
{"next-fua", no_argument, NULL, 0},
+ {"next-write", required_argument, NULL, 0},
{"start-entry", required_argument, NULL, 0},
{"end-mark", required_argument, NULL, 0},
{"log", required_argument, NULL, 0},
@@ -53,6 +55,8 @@ static void usage(void)
fprintf(stderr, "\t--limit <number> - number of entries to replay\n");
fprintf(stderr, "\t--next-flush - replay to/find the next flush\n");
fprintf(stderr, "\t--next-fua - replay to/find the next fua\n");
+ fprintf(stderr, "\t--next-write <sector> - replay to/find the next "
+ "write to <sector>\n");
fprintf(stderr, "\t--start-entry <entry> - start at the given "
"entry #\n");
fprintf(stderr, "\t--start-mark <mark> - mark to start from\n");
@@ -139,6 +143,7 @@ int main(int argc, char **argv)
char *logfile = NULL, *replayfile = NULL, *fsck_command = NULL;
struct log_write_entry *entry;
u64 stop_flags = 0;
+ u64 stop_sector = 0;
u64 start_entry = 0;
u64 start_sector = 0;
u64 end_sector = -1ULL;
@@ -173,6 +178,14 @@ int main(int argc, char **argv)
case NEXT_FUA:
stop_flags |= LOG_FUA_FLAG;
break;
+ case NEXT_WRITE:
+ stop_sector = strtoull(optarg, &tmp, 0);
+ if (tmp && *tmp != '\0') {
+ fprintf(stderr, "Invalid sector number\n");
+ exit(1);
+ }
+ tmp = NULL;
+ break;
case START_ENTRY:
start_entry = strtoull(optarg, &tmp, 0);
if (tmp && *tmp != '\0') {
@@ -324,7 +337,8 @@ int main(int argc, char **argv)
while ((ret = log_seek_next_entry(log, entry, 1)) == 0) {
num_entries++;
if ((run_limit && num_entries == run_limit) ||
- should_stop(entry, stop_flags, end_mark)) {
+ should_stop(entry, stop_flags, end_mark) ||
+ (stop_sector && entry->sector == stop_sector)) {
printf("%llu@%llu\n",
(unsigned long long)log->cur_entry - 1,
log->cur_pos / log->sectorsize);
--
2.21.0
