From: Mike Christie <michaelc@cs.wisc.edu>
To: Linux Kernel <linux-kernel@vger.kernel.org>, Jens Axboe <axboe@suse.de>
Subject: [PATCH] set request fastfail bit
Date: Tue, 09 Mar 2004 22:39:32 -0800 [thread overview]
Message-ID: <404EB824.1030806@cs.wisc.edu> (raw)
[-- Attachment #1: Type: text/plain, Size: 329 bytes --]
The first three bio and request flags are no longer identical.
The bio barrier and rw flags are getting set in __make_request
and get_request respectively, and failfast is getting
left out. The attached patch (built against 2.6.4-rc3)
sets the request's failfast flag in __make_request when the bio's
flag is set.
Mike Chrisite
[-- Attachment #2: failfast.patch --]
[-- Type: text/plain, Size: 943 bytes --]
--- linux-2.6.4-rc3-orig/drivers/block/ll_rw_blk.c 2004-03-09 22:21:26.819208694 -0800
+++ linux-2.6.4-rc3-ff/drivers/block/ll_rw_blk.c 2004-03-09 22:37:02.395169904 -0800
@@ -2121,11 +2121,14 @@ get_rq:
goto again;
}
+ req->flags |= REQ_CMD;
+
/*
- * first three bits are identical in rq->flags and bio->bi_rw,
- * see bio.h and blkdev.h
+ * inherit FAILFAST from bio and don't stack up
+ * retries for read ahead
*/
- req->flags = (bio->bi_rw & 7) | REQ_CMD;
+ if (ra || test_bit(BIO_RW_FAILFAST, &bio->bi_rw))
+ req->flags |= REQ_FAILFAST;
/*
* REQ_BARRIER implies no merging, but lets make it explicit
@@ -2133,12 +2136,6 @@ get_rq:
if (barrier)
req->flags |= (REQ_HARDBARRIER | REQ_NOMERGE);
- /*
- * don't stack up retries for read ahead
- */
- if (ra)
- req->flags |= REQ_FAILFAST;
-
req->errors = 0;
req->hard_sector = req->sector = sector;
req->hard_nr_sectors = req->nr_sectors = nr_sectors;
next reply other threads:[~2004-03-10 6:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-10 6:39 Mike Christie [this message]
2004-03-10 6:57 ` [PATCH] set request fastfail bit Mike Christie
2004-03-10 9:02 ` Jens Axboe
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