Commit e2494e1b authored Apr 02, 2009 by Li Zefan Committed by Ingo Molnar Apr 03, 2009

blktrace: fix pdu_len when tracing packet command requests



Impact: output all of packet commands - not just the first 4 / 8 bytes

Since commit d7e3c324 ("block: add
large command support"), struct request->cmd has been changed from
unsinged char cmd[BLK_MAX_CDB] to unsigned char *cmd.

v1 -> v2: by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

- make sure rq->cmd_len is always intialized, and then we can use
  rq->cmd_len instead of BLK_MAX_CDB.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
LKML-Reference: <49D4507E.2060602@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 7635b03a

block/blk-core.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -132,6 +132,7 @@ void blk_rq_init(struct request_queue q, struct request rq)
		INIT_HLIST_NODE(&rq->hash);
		RB_CLEAR_NODE(&rq->rb_node);
		rq->cmd = rq->__cmd;
		rq->cmd_len = BLK_MAX_CDB;
		rq->tag = -1;
		rq->ref_count = 1;
		}

kernel/trace/blktrace.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -643,7 +643,7 @@ static void blk_add_trace_rq(struct request_queue q, struct request rq,
		if (blk_pc_request(rq)) {
		what \|= BLK_TC_ACT(BLK_TC_PC);
		__blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors,
		sizeof(rq->cmd), rq->cmd);
		rq->cmd_len, rq->cmd);
		} else {
		what \|= BLK_TC_ACT(BLK_TC_FS);
		__blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,

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