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authorChristoph Hellwig <hch@lst.de>2014-11-03 16:09:02 +0300
committerChristoph Hellwig <hch@lst.de>2014-11-12 13:19:43 +0300
commit2ecb204d07ac8debe3893c362415919bc78bebd6 (patch)
treeeef99b324201b21de358dffdab8bfc0453358d5f /include/scsi/scsi_host.h
parente2eddf4d530df745019fded0fedfb78f6d3e33ca (diff)
downloadlinux-2ecb204d07ac8debe3893c362415919bc78bebd6.tar.xz
scsi: always assign block layer tags if enabled
Allow a driver to ask for block layer tags by setting .use_blk_tags in the host template, in which case it will always see a valid value in request->tag, similar to the behavior when using blk-mq. This means even SCSI "untagged" commands will now have a tag, which is especially useful when using a host-wide tag map. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Mike Christie <michaelc@cs.wisc.edu> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.de>
Diffstat (limited to 'include/scsi/scsi_host.h')
-rw-r--r--include/scsi/scsi_host.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index d6bd65294009..61a81bf77e28 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -422,6 +422,11 @@ struct scsi_host_template {
unsigned char present;
/*
+ * Let the block layer assigns tags to all commands.
+ */
+ unsigned use_blk_tags:1;
+
+ /*
* This specifies the mode that a LLD supports.
*/
unsigned supported_mode:2;