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authorMartin K. Petersen <martin.petersen@oracle.com>2012-09-18 12:19:27 -0400
committerJens Axboe <axboe@kernel.dk>2012-09-20 14:31:45 +0200
commit4363ac7c13a9a4b763c6e8d9fdbfc2468f3b8ca4 (patch)
tree010b05699eb9544b9cdfe5e1b3affdaea80132e7 /include/linux/bio.h
parentf31dc1cd490539e2b62a126bc4dc2495b165d772 (diff)
downloadop-kernel-dev-4363ac7c13a9a4b763c6e8d9fdbfc2468f3b8ca4.zip
op-kernel-dev-4363ac7c13a9a4b763c6e8d9fdbfc2468f3b8ca4.tar.gz
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 'include/linux/bio.h')
-rw-r--r--include/linux/bio.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h
index e54305c..820e7aa 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -399,6 +399,9 @@ static inline bool bio_is_rw(struct bio *bio)
if (!bio_has_data(bio))
return false;
+ if (bio->bi_rw & REQ_WRITE_SAME)
+ return false;
+
return true;
}
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