diff options
| author | Christoph Hellwig <hch@lst.de> | 2015-01-14 10:42:41 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-01-20 14:05:38 -0700 |
| commit | df0ce26cb4ee8bc233d50213b97213532aff0a3c (patch) | |
| tree | bfc9ae26255daa5bd5d633520151223551faf016 /include/trace/events/writeback.h | |
| parent | c4db59d31e39ea067c32163ac961e9c80198fd37 (diff) | |
| download | talos-obmc-linux-df0ce26cb4ee8bc233d50213b97213532aff0a3c.tar.gz talos-obmc-linux-df0ce26cb4ee8bc233d50213b97213532aff0a3c.zip | |
fs: remove default_backing_dev_info
Now that default_backing_dev_info is not used for writeback purposes we can
git rid of it easily:
- instead of using it's name for tracing unregistered bdi we just use
"unknown"
- btrfs and ceph can just assign the default read ahead window themselves
like several other filesystems already do.
- we can assign noop_backing_dev_info as the default one in alloc_super.
All filesystems already either assigned their own or
noop_backing_dev_info.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/trace/events/writeback.h')
| -rw-r--r-- | include/trace/events/writeback.h | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h index 74f5207bd090..0e9310905413 100644 --- a/include/trace/events/writeback.h +++ b/include/trace/events/writeback.h @@ -156,10 +156,8 @@ DECLARE_EVENT_CLASS(writeback_work_class, __field(int, reason) ), TP_fast_assign( - struct device *dev = bdi->dev; - if (!dev) - dev = default_backing_dev_info.dev; - strncpy(__entry->name, dev_name(dev), 32); + strncpy(__entry->name, + bdi->dev ? dev_name(bdi->dev) : "(unknown)", 32); __entry->nr_pages = work->nr_pages; __entry->sb_dev = work->sb ? work->sb->s_dev : 0; __entry->sync_mode = work->sync_mode; |
