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block: cleanup tracing

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A couple tweaks to the tracing code:

 - trace the request size for all requests
 - trace request sector and nr_sectors only for fs requests, enforced by
   helpers
 - drop SCSI CDB tracing - we have SCSI tracing for this and are going
   to me the CDB out of the generic struct request soon.

With this the tracing code stops to know about BLOCK_PC requests entirely,
it's just FS vs passthrough requests now, where the latter includes any
driver-private requests.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig
2017-01-27 09:35:54 +01:00
committed by Jens Axboe
parent 6d247d7f71
commit 48b77ad608
3 changed files with 26 additions and 62 deletions
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18
include/linux/blktrace_api.h
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@@ -110,16 +110,16 @@ struct compat_blk_user_trace_setup {
#endif
#if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK)
static inline int blk_cmd_buf_len(struct request *rq)
{
return (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? rq->cmd_len * 3 : 1;
}
extern void blk_dump_cmd(char *buf, struct request *rq);
extern void blk_fill_rwbs(char *rwbs, unsigned int op, int bytes);
#endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */
static inline sector_t blk_rq_trace_sector(struct request *rq)
{
return (rq->cmd_type != REQ_TYPE_FS) ? 0 : blk_rq_pos(rq);
}
static inline unsigned int blk_rq_trace_nr_sectors(struct request *rq)
{
return (rq->cmd_type != REQ_TYPE_FS) ? 0 : blk_rq_sectors(rq);
}
#endif