1. 21 10月, 2010 1 次提交
  2. 20 10月, 2010 2 次提交
  3. 19 10月, 2010 6 次提交
  4. 18 10月, 2010 14 次提交
  5. 17 10月, 2010 2 次提交
  6. 16 10月, 2010 14 次提交
  7. 15 10月, 2010 1 次提交
    • T
      ubd: fix incorrect sector handling during request restart · 47526903
      Tejun Heo 提交于
      Commit f81f2f7c (ubd: drop unnecessary rq->sector manipulation)
      dropped request->sector manipulation in preparation for global request
      handling cleanup; unfortunately, it incorrectly assumed that the
      updated sector wasn't being used.
      
      ubd tries to issue as many requests as possible to io_thread.  When
      issuing fails due to memory pressure or other reasons, the device is
      put on the restart list and issuing stops.  On IO completion, devices
      on the restart list are scanned and IO issuing is restarted.
      
      ubd issues IOs sg-by-sg and issuing can be stopped in the middle of a
      request, so each device on the restart queue needs to remember where
      to restart in its current request.  ubd needs to keep track of the
      issue position itself because,
      
      * blk_rq_pos(req) is now updated by the block layer to keep track of
        _completion_ position.
      
      * Multiple io_req's for the current request may be in flight, so it's
        difficult to tell where blk_rq_pos(req) currently is.
      
      Add ubd->rq_pos to keep track of the issue position and use it to
      correctly restart io_req issue.
      Signed-off-by: NTejun Heo <tj@kernel.org>
      Reported-by: NRichard Weinberger <richard@nod.at>
      Tested-by: NRichard Weinberger <richard@nod.at>
      Tested-by: NChris Frey <cdfrey@foursquare.net>
      Cc: stable@kernel.org
      Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
      47526903