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| author | Martin K. Petersen <martin.petersen@oracle.com> | 2012-09-18 12:19:27 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2012-09-20 14:31:45 +0200 |
| commit | 4363ac7c13a9a4b763c6e8d9fdbfc2468f3b8ca4 (patch) | |
| tree | 010b05699eb9544b9cdfe5e1b3affdaea80132e7 /drivers/md | |
| parent | f31dc1cd490539e2b62a126bc4dc2495b165d772 (diff) | |
| download | blackbird-obmc-linux-4363ac7c13a9a4b763c6e8d9fdbfc2468f3b8ca4.tar.gz blackbird-obmc-linux-4363ac7c13a9a4b763c6e8d9fdbfc2468f3b8ca4.zip | |
block: Implement support for WRITE SAME
The WRITE SAME command supported on some SCSI devices allows the same
block to be efficiently replicated throughout a block range. Only a
single logical block is transferred from the host and the storage device
writes the same data to all blocks described by the I/O.
This patch implements support for WRITE SAME in the block layer. The
blkdev_issue_write_same() function can be used by filesystems and block
drivers to replicate a buffer across a block range. This can be used to
efficiently initialize software RAID devices, etc.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/raid0.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index de63a1fc3737..a9e4fa95dfaa 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -422,6 +422,7 @@ static int raid0_run(struct mddev *mddev) if (md_check_no_bitmap(mddev)) return -EINVAL; blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors); + blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors); /* if private is not null, we are here after takeover */ if (mddev->private == NULL) { |
