dm-dedup: status function

The status function prints various statistics about a deduplication
target instance.

Signed-off-by: Vasily Tarasov <tarasov@vasily.name>

diff --git a/drivers/md/dm-dedup-target.c b/drivers/md/dm-dedup-target.c
index 08875434583d53dee092a955fe57837a8333f5a2..699af961d32b4a4223a2939c39990698cd0326e5 100644 (file)
--- a/drivers/md/dm-dedup-target.c
+++ b/drivers/md/dm-dedup-target.c
@@ -744,6 +744,39 @@ static void dm_dedup_dtr_fn(struct dm_target *ti)
        kfree(dc);
 }
 
+static void dm_dedup_status_fn(struct dm_target *ti, status_type_t status_type,
+               unsigned status_flags, char *result, unsigned maxlen)
+{
+       struct dedup_config *dc = ti->private;
+       uint64_t data_total_block_count;
+       uint64_t data_used_block_count;
+       uint64_t data_free_block_count;
+       uint64_t data_actual_block_count;
+       int sz = 0;
+
+       switch (status_type) {
+       case STATUSTYPE_INFO:
+       case STATUSTYPE_TABLE:
+               data_used_block_count = dc->physical_block_counter;
+               data_actual_block_count = dc->logical_block_counter;
+               data_total_block_count = dc->pblocks;
+
+               data_free_block_count =
+                       data_total_block_count - data_used_block_count;
+
+               DMEMIT("%llu %llu %llu %llu ",
+                       data_total_block_count, data_free_block_count,
+                       data_used_block_count, data_actual_block_count);
+
+               DMEMIT("%u %s %s ", dc->block_size,
+                       dc->data_dev->name, dc->metadata_dev->name);
+
+               DMEMIT("%llu %llu %llu %llu %llu %llu",
+                       dc->writes, dc->uniqwrites, dc->dupwrites,
+                       dc->reads_on_writes, dc->overwrites, dc->newwrites);
+       }
+}
+
 static int mark_lbn_pbn_bitmap(void *key, int32_t ksize,
                void *value, int32_t vsize, void *data)
 {
@@ -885,6 +918,7 @@ static struct target_type dm_dedup_target = {
        .map = dm_dedup_map_fn,
        .end_io = dm_dedup_endio_fn,
        .message = dm_dedup_message_fn,
+       .status = dm_dedup_status_fn,
 };
 
 static int __init dm_dedup_init(void)