Li Zefan 1d54ad6da9 blktrace: add trace/ to /sys/block/sda ...

Impact: allow ftrace-plugin blktrace to trace device-mapper devices

To trace a single partition:
  # echo 1 > /sys/block/sda/sda1/enable

To trace the whole sda instead:
  # echo 1 > /sys/block/sda/enable

Thus we also fix an issue reported by Ted, that ftrace-plugin blktrace
can't be used to trace device-mapper devices.

Now:

  # echo 1 > /sys/block/dm-0/trace/enable
  echo: write error: No such device or address
  # mount -t ext4 /dev/dm-0 /mnt
  # echo 1 > /sys/block/dm-0/trace/enable
  # echo blk > /debug/tracing/current_tracer

Reported-by: Theodore Tso <tytso@mit.edu>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Shawn Du <duyuyang@gmail.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
LKML-Reference: <49E42665.6020506@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2009-04-16 10:10:59 +02:00

..

as-iosched.c

block: get rid of elevator_t typedef

2008-12-29 08:29:50 +01:00

blk-barrier.c

block: Fix documentation for blkdev_issue_flush()

2009-01-30 12:34:37 +01:00

blk-core.c

Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2009-04-07 14:10:10 -07:00

blk-exec.c

Add some block/ source files to the kernel-api docbook. Fix kernel-doc notation in them as needed. Fix changed function parameter names. Fix typos/spellos. In comments, change REQ_SPECIAL to REQ_TYPE_SPECIAL and REQ_BLOCK_PC to REQ_TYPE_BLOCK_PC.

2008-10-09 08:56:03 +02:00

blk-integrity.c

block: Allow empty integrity profile

2009-01-30 12:34:36 +01:00

blk-ioc.c

cfq-iosched: fix RCU race in the cfq io_context destructor handling

2008-05-07 09:28:57 +02:00

blk-map.c

[SCSI] block: make blk_rq_map_user take a NULL user-space buffer for WRITE

2009-01-02 11:10:35 -06:00

blk-merge.c

block: fix inconsistency in I/O stat accounting code

2009-04-07 08:12:38 +02:00

blk-settings.c

pata_artop: typo

2009-04-06 20:00:29 -04:00

blk-softirq.c

generic-ipi: remove CSD_FLAG_WAIT

2009-02-25 14:13:44 +01:00

blk-sysfs.c

blktrace: add trace/ to /sys/block/sda

2009-04-16 10:10:59 +02:00

blk-tag.c

block/blk-tag.c: cleanup kernel-doc

2008-12-29 08:28:43 +01:00

blk-timeout.c

block: fix deadlock in blk_abort_queue() for drivers that readd to timeout list

2009-02-18 10:34:16 +01:00

blk.h

block: fix inconsistency in I/O stat accounting code

2009-04-07 08:12:38 +02:00

bsg.c

bsg: Remove bogus check against request_queue->max_sectors

2009-03-26 11:01:25 +01:00

cfq-iosched.c

cfq-iosched: don't let idling interfere with plugging

2009-04-07 11:38:31 +02:00

cmd-filter.c

[SCSI] Make scsi.h independent of the rest of the scsi includes

2009-03-12 12:58:13 -05:00

compat_ioctl.c

blktrace: support per-partition tracing

2009-04-16 10:10:57 +02:00

deadline-iosched.c

block: get rid of elevator_t typedef

2008-12-29 08:29:50 +01:00

elevator.c

block: fix inconsistency in I/O stat accounting code

2009-04-07 08:12:38 +02:00

genhd.c

block: add documentation for register_blkdev()

2009-02-26 10:45:48 +01:00

ioctl.c

block: don't take lock on changing ra_pages

2008-12-29 08:28:43 +01:00

Kconfig

tracing/blktrace: move the tracing file to kernel/trace

2009-02-09 10:51:02 +01:00

Kconfig.iosched

update I/O sched Kconfig help texts - CFQ is now default, not AS.

2007-02-17 20:08:22 +01:00

Makefile

tracing/blktrace: move the tracing file to kernel/trace

2009-02-09 10:51:02 +01:00

noop-iosched.c

block: get rid of elevator_t typedef

2008-12-29 08:29:50 +01:00

scsi_ioctl.c

block: WARN in __blk_put_request() for potential bio leak

2009-03-26 11:01:23 +01:00