From: Badari Pulavarty <pbadari@us.ibm.com>
Date: Fri, 15 Sep 2006 16:07:18 +0000 (-0700)
Subject: ext3 sequential read regression fix
X-Git-Tag: v2.6.17.14~12
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cfb3f12260beaf5dc8f765a1c191822896019d8a;p=thirdparty%2Fkernel%2Fstable.git

ext3 sequential read regression fix

ext3-get-blocks support caused ~20% degrade in Sequential read
performance (tiobench). Problem is with marking the buffer boundary
so IO can be submitted right away. Here is the patch to fix it.

2.6.18-rc6:
---

diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index 21b8bf4ee8613..f9be16e3393ee 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -926,7 +926,7 @@ int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
 	set_buffer_new(bh_result);
 got_it:
 	map_bh(bh_result, inode->i_sb, le32_to_cpu(chain[depth-1].key));
-	if (blocks_to_boundary == 0)
+	if (count > blocks_to_boundary)
 		set_buffer_boundary(bh_result);
 	err = count;
 	/* Clean up and exit */