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Go Back   Linux Archive > Redhat > Cluster Development

 
 
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Old 12-12-2007, 12:29 AM
Bob Peterson
 
Default Function meta_read optimization

Hi,

This patch optimizes function gfs2_meta_read. Basically, gfs2_meta_wait
was being called regardless of whether a disk read was requested.
This just pulls that wait into the if that triggers the read.

Regards,

Bob Peterson
Red Hat GFS

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
--
.../fs/gfs2/meta_io.c | 13 +++++++------
1 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/gfs2-2.6.git.patch9/fs/gfs2/meta_io.c b/gfs2-2.6.git.patch10/fs/gfs2/meta_io.c
index 9fdbfd3..f7400c4 100644
--- a/gfs2-2.6.git.patch9/fs/gfs2/meta_io.c
+++ b/gfs2-2.6.git.patch10/fs/gfs2/meta_io.c
@@ -201,13 +201,14 @@ int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
struct buffer_head **bhp)
{
*bhp = getbuf(gl, blkno, CREATE);
- if (!buffer_uptodate(*bhp))
+ if (!buffer_uptodate(*bhp)) {
ll_rw_block(READ_META, 1, bhp);
- if (flags & DIO_WAIT) {
- int error = gfs2_meta_wait(gl->gl_sbd, *bhp);
- if (error) {
- brelse(*bhp);
- return error;
+ if (flags & DIO_WAIT) {
+ int error = gfs2_meta_wait(gl->gl_sbd, *bhp);
+ if (error) {
+ brelse(*bhp);
+ return error;
+ }
}
}
 
Old 01-21-2008, 08:21 AM
 
Default Function meta_read optimization

From: Bob Peterson <rpeterso@redhat.com>

This patch optimizes function gfs2_meta_read. Basically, gfs2_meta_wait
was being called regardless of whether a disk read was requested.
This just pulls that wait into the if that triggers the read.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 9688785..bc28bc6 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -222,13 +222,14 @@ int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
struct buffer_head **bhp)
{
*bhp = getbuf(gl, blkno, CREATE);
- if (!buffer_uptodate(*bhp))
+ if (!buffer_uptodate(*bhp)) {
ll_rw_block(READ_META, 1, bhp);
- if (flags & DIO_WAIT) {
- int error = gfs2_meta_wait(gl->gl_sbd, *bhp);
- if (error) {
- brelse(*bhp);
- return error;
+ if (flags & DIO_WAIT) {
+ int error = gfs2_meta_wait(gl->gl_sbd, *bhp);
+ if (error) {
+ brelse(*bhp);
+ return error;
+ }
}
}

--
1.5.1.2
 

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