1. 07 May, 2008 1 commit
  2. 29 Apr, 2008 1 commit
  3. 21 Apr, 2008 1 commit
    • FUJITA Tomonori's avatar
      block: move the padding adjustment to blk_rq_map_sg · f18573ab
      FUJITA Tomonori authored
      blk_rq_map_user adjusts bi_size of the last bio. It breaks the rule
      that req->data_len (the true data length) is equal to sum(bio). It
      broke the scsi command completion code.
      
      commit e97a294e was introduced to fix
      the above issue. However, the partial completion code doesn't work
      with it. The commit is also a layer violation (scsi mid-layer should
      not know about the block layer's padding).
      
      This patch moves the padding adjustment to blk_rq_map_sg (suggested by
      James). The padding works like the drain buffer. This patch breaks the
      rule that req->data_len is equal to sum(sg), however, the drain buffer
      already broke it. So this patch just restores the rule that
      req->data_len is equal to sub(bio) without breaking anything new.
      
      Now when a low level driver needs padding, blk_rq_map_user and
      blk_rq_map_user_iov guarantee there's enough room for padding.
      blk_rq_map_sg can safely extend the last entry of a scatter list.
      
      blk_rq_map_sg must extend the last entry of a scatter list only for a
      request that got through bio_copy_user_iov. This patches introduces
      new REQ_COPY_USER flag.
      Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
      Cc: Tejun Heo <htejun@gmail.com>
      Cc: Mike Christie <michaelc@cs.wisc.edu>
      Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
      Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
      f18573ab
  4. 04 Mar, 2008 1 commit
    • FUJITA Tomonori's avatar
      block: restore the meaning of rq->data_len to the true data length · 7a85f889
      FUJITA Tomonori authored
      The meaning of rq->data_len was changed to the length of an allocated
      buffer from the true data length. It breaks SG_IO friends and
      bsg. This patch restores the meaning of rq->data_len to the true data
      length and adds rq->extra_len to store an extended length (due to
      drain buffer and padding).
      
      This patch also removes the code to update bio in blk_rq_map_user
      introduced by the commit 40b01b9b.
      The commit adjusts bio according to memory alignment
      (queue_dma_alignment). However, memory alignment is NOT padding
      alignment. This adjustment also breaks SG_IO friends and bsg. Padding
      alignment needs to be fixed in a proper way (by a separate patch).
      Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
      Signed-off-by: default avatarJens Axboe <axboe@carl.home.kernel.dk>
      7a85f889
  5. 19 Feb, 2008 3 commits
    • Tejun Heo's avatar
      block: clear drain buffer if draining for write command · db0a2e00
      Tejun Heo authored
      Clear drain buffer before chaining if the command in question is a
      write.
      Signed-off-by: default avatarTejun Heo <htejun@gmail.com>
      Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
      db0a2e00
    • Tejun Heo's avatar
      block: implement request_queue->dma_drain_needed · 2fb98e84
      Tejun Heo authored
      Draining shouldn't be done for commands where overflow may indicate
      data integrity issues.  Add dma_drain_needed callback to
      request_queue.  Drain buffer is appened iff this function returns
      non-zero.
      Signed-off-by: default avatarTejun Heo <htejun@gmail.com>
      Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
      Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
      2fb98e84
    • Tejun Heo's avatar
      block: add request->raw_data_len · 6b00769f
      Tejun Heo authored
      With padding and draining moved into it, block layer now may extend
      requests as directed by queue parameters, so now a request has two
      sizes - the original request size and the extended size which matches
      the size of area pointed to by bios and later by sgs.  The latter size
      is what lower layers are primarily interested in when allocating,
      filling up DMA tables and setting up the controller.
      
      Both padding and draining extend the data area to accomodate
      controller characteristics.  As any controller which speaks SCSI can
      handle underflows, feeding larger data area is safe.
      
      So, this patch makes the primary data length field, request->data_len,
      indicate the size of full data area and add a separate length field,
      request->raw_data_len, for the unmodified request size.  The latter is
      used to report to higher layer (userland) and where the original
      request size should be fed to the controller or device.
      Signed-off-by: default avatarTejun Heo <htejun@gmail.com>
      Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
      Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
      6b00769f
  6. 08 Feb, 2008 1 commit
  7. 01 Feb, 2008 1 commit
  8. 29 Jan, 2008 1 commit