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Commit 12f03a49 authored by Kevin Corry's avatar Kevin Corry Committed by Linus Torvalds
Browse files

[PATCH] device-mapper statistics: basic 



Record basic I/O statistics for mapped devices.

Signed-off-by: default avatarKevin Corry <kevcorry@us.ibm.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent dab6a429

drivers/md/dm.c

+4 −0
Original line number Diff line number Diff line
@@ -573,10 +573,14 @@ static void __split_bio(struct mapped_device *md, struct bio *bio) 
static int dm_request(request_queue_t *q, struct bio *bio)

{

	int r;

	int rw = bio_data_dir(bio);

	struct mapped_device *md = q->queuedata;



	down_read(&md->io_lock);



	disk_stat_inc(dm_disk(md), ios[rw]);

	disk_stat_add(dm_disk(md), sectors[rw], bio_sectors(bio));



	/*

	 * If we're suspended we have to queue

	 * this io for later.