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authorShawn Du <duyuyang@gmail.com>2009-04-14 13:58:56 +0800
committerIngo Molnar <mingo@elte.hu>2009-04-16 10:10:57 +0200
commitd0deef5b14af7d5bbd0003a0a2a1a32326e20a6d (patch)
treede1d438935a4cc50dd9d7e0ccccc3cfc5c7e6c06 /drivers/scsi/sg.c
parent9cfe06f8cd5c8c3ad6ab323973e87dde670642b8 (diff)
blktrace: support per-partition tracing
Though one can specify '-d /dev/sda1' when using blktrace, it still traces the whole sda. To support per-partition tracing, when we start tracing, we initialize bt->start_lba and bt->end_lba to the start and end sector of that partition. Note some actions are per device, thus we don't filter 0-sector events. The original patch and discussion can be found here: http://marc.info/?l=linux-btrace&m=122949374214540&w=2 Signed-off-by: Shawn Du <duyuyang@gmail.com> 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: Jens Axboe <jens.axboe@oracle.com> LKML-Reference: <49E42620.4050701@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/scsi/sg.c')
-rw-r--r--drivers/scsi/sg.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 82312df9b0b..49c98730bb8 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1065,6 +1065,7 @@ sg_ioctl(struct inode *inode, struct file *filp,
return blk_trace_setup(sdp->device->request_queue,
sdp->disk->disk_name,
MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
+ NULL,
(char *)arg);
case BLKTRACESTART:
return blk_trace_startstop(sdp->device->request_queue, 1);