lkml.org 
[lkml]   [2009]   [Aug]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH 1/7] Make DISCARD_BARRIER and DISCARD_NOBARRIER writes instead of reads
From: David Woodhouse <dwmw2@infradead.org>

The commands are conceptually writes, and in the case of IDE and SCSI
commands actually are writes. They were only reads because we thought
that would interact better with the elevators. Now the elevators know
about discard requests, that advantage no longer exists.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
---

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 5bed436..28f8e5d 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -161,8 +161,8 @@ struct inodes_stat_t {
* These aren't really reads or writes, they pass down information about
* parts of device that are now unused by the file system.
*/
-#define DISCARD_NOBARRIER (1 << BIO_RW_DISCARD)
-#define DISCARD_BARRIER ((1 << BIO_RW_DISCARD) | (1 << BIO_RW_BARRIER))
+#define DISCARD_NOBARRIER (WRITE | (1 << BIO_RW_DISCARD))
+#define DISCARD_BARRIER (DISCARD_NOBARRIER | (1 << BIO_RW_BARRIER))

#define SEL_IN 1
#define SEL_OUT 2


\
 
 \ /
  Last update: 2009-08-30 01:15    [W:0.328 / U:0.476 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site