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17 May 2024, 11:00:25 UTC
Revision d11bb4462c4cc6ddd45c6927c617ad79fa6fb8fc authored by Wanlong Gao on 21 September 2011, 08:22:10 UTC, committed by Jens Axboe on 21 September 2011, 08:22:10 UTC 
blk-cgroup: be able to remove the record of unplugged device
 
The bug is we're not able to remove the device from blkio cgroup's
per-device control files if it gets unplugged.

To reproduce the bug:

  # mount -t cgroup -o blkio xxx /cgroup
  # cd /cgroup
  # echo "8:0 1000" > blkio.throttle.read_bps_device
  # unplug the device
  # cat blkio.throttle.read_bps_device
  8:0	1000
  # echo "8:0 0" > blkio.throttle.read_bps_device
  -bash: echo: write error: No such device

After patching, the device removal will succeed.

Thanks for the comments of Paul, Zefan, and Vivek.

Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Paul Menage <paul@paulmenage.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 parent 8ad6a56
History
Tip revision: d11bb4462c4cc6ddd45c6927c617ad79fa6fb8fc authored by Wanlong Gao on 21 September 2011, 08:22:10 UTC
blk-cgroup: be able to remove the record of unplugged device
Tip revision: d11bb44
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