summaryrefslogtreecommitdiffstats
path: root/include/scsi/scsi_host.h
diff options
context:
space:
mode:
authorShaohua Li <shli@fb.com>2015-01-15 17:32:25 -0800
committerJens Axboe <axboe@fb.com>2015-01-23 14:15:46 -0700
commitee1b6f7aff94019c09e73837054979063f722046 (patch)
tree79c7b943d7c6d62fec1874afd2c50964de054aa0 /include/scsi/scsi_host.h
parentbb5c3cdda37aad22996d6da2addd58cadc0436c0 (diff)
downloadop-kernel-dev-ee1b6f7aff94019c09e73837054979063f722046.zip
op-kernel-dev-ee1b6f7aff94019c09e73837054979063f722046.tar.gz
block: support different tag allocation policy
The libata tag allocation is using a round-robin policy. Next patch will make libata use block generic tag allocation, so let's add a policy to tag allocation. Currently two policies: FIFO (default) and round-robin. Cc: Jens Axboe <axboe@fb.com> Cc: Tejun Heo <tj@kernel.org> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/scsi/scsi_host.h')
-rw-r--r--include/scsi/scsi_host.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 019e668..e113c75 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -402,6 +402,9 @@ struct scsi_host_template {
*/
unsigned char present;
+ /* If use block layer to manage tags, this is tag allocation policy */
+ int tag_alloc_policy;
+
/*
* Let the block layer assigns tags to all commands.
*/
OpenPOWER on IntegriCloud