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Merge branch 'for-2.6.37/barrier' of git://git.kernel.dk/linux-2.6-block

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* 'for-2.6.37/barrier' of git://git.kernel.dk/linux-2.6-block: (46 commits)
  xen-blkfront: disable barrier/flush write support
  Added blk-lib.c and blk-barrier.c was renamed to blk-flush.c
  block: remove BLKDEV_IFL_WAIT
  aic7xxx_old: removed unused 'req' variable
  block: remove the BH_Eopnotsupp flag
  block: remove the BLKDEV_IFL_BARRIER flag
  block: remove the WRITE_BARRIER flag
  swap: do not send discards as barriers
  fat: do not send discards as barriers
  ext4: do not send discards as barriers
  jbd2: replace barriers with explicit flush / FUA usage
  jbd2: Modify ASYNC_COMMIT code to not rely on queue draining on barrier
  jbd: replace barriers with explicit flush / FUA usage
  nilfs2: replace barriers with explicit flush / FUA usage
  reiserfs: replace barriers with explicit flush / FUA usage
  gfs2: replace barriers with explicit flush / FUA usage
  btrfs: replace barriers with explicit flush / FUA usage
  xfs: replace barriers with explicit flush / FUA usage
  block: pass gfp_mask and flags to sb_issue_discard
  dm: convey that all flushes are processed as empty
  ...
This commit is contained in:
Linus Torvalds
2010-10-22 17:07:18 -07:00
parent 8abfc6e7a4 005a1d15f5
commit a2887097f2
80 changed files with 849 additions and 1925 deletions
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block/blk-settings.c
+20
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@@ -792,6 +792,26 @@ void blk_queue_update_dma_alignment(struct request_queue *q, int mask)
}
EXPORT_SYMBOL(blk_queue_update_dma_alignment);
/**
* blk_queue_flush - configure queue's cache flush capability
* @q: the request queue for the device
* @flush: 0, REQ_FLUSH or REQ_FLUSH | REQ_FUA
*
* Tell block layer cache flush capability of @q. If it supports
* flushing, REQ_FLUSH should be set. If it supports bypassing
* write cache for individual writes, REQ_FUA should be set.
*/
void blk_queue_flush(struct request_queue *q, unsigned int flush)
{
WARN_ON_ONCE(flush & ~(REQ_FLUSH | REQ_FUA));
if (WARN_ON_ONCE(!(flush & REQ_FLUSH) && (flush & REQ_FUA)))
flush &= ~REQ_FUA;
q->flush_flags = flush & (REQ_FLUSH | REQ_FUA);
}
EXPORT_SYMBOL_GPL(blk_queue_flush);
static int __init blk_settings_init(void)
{
blk_max_low_pfn = max_low_pfn - 1;