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[GFS2] Get rid of gl_waiters2

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This patch reduces memory by replacing the int variable
gl_waiters2 by a single bit in the gl_flags.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Bob Peterson 2008-01-28 22:31:39 -06:00 committed by Steven Whitehouse
parent 42d52e3818
commit 29d38cd163
2 changed files with 6 additions and 5 deletions
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7
fs/gfs2/glock.c
View file

@ -595,11 +595,12 @@ static void run_queue(struct gfs2_glock *gl)
blocked = rq_mutex(gh);
} else if (test_bit(GLF_DEMOTE, &gl->gl_flags)) {
blocked = rq_demote(gl);
if (gl->gl_waiters2 && !blocked) {
if (test_bit(GLF_WAITERS2, &gl->gl_flags) &&
!blocked) {
set_bit(GLF_DEMOTE, &gl->gl_flags);
gl->gl_demote_state = LM_ST_UNLOCKED;
}
gl->gl_waiters2 = 0;
clear_bit(GLF_WAITERS2, &gl->gl_flags);
} else if (!list_empty(&gl->gl_waiters3)) {
gh = list_entry(gl->gl_waiters3.next,
struct gfs2_holder, gh_list);
@ -710,7 +711,7 @@ static void handle_callback(struct gfs2_glock *gl, unsigned int state,
} else if (gl->gl_demote_state != LM_ST_UNLOCKED &&
gl->gl_demote_state != state) {
if (test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags))
gl->gl_waiters2 = 1;
set_bit(GLF_WAITERS2, &gl->gl_flags);
else
gl->gl_demote_state = LM_ST_UNLOCKED;
}

4
fs/gfs2/incore.h
View file

@ -1,6 +1,6 @@
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
@ -167,6 +167,7 @@ enum {
GLF_DIRTY = 5,
GLF_DEMOTE_IN_PROGRESS = 6,
GLF_LFLUSH = 7,
GLF_WAITERS2 = 8,
};
struct gfs2_glock {
@ -186,7 +187,6 @@ struct gfs2_glock {
struct list_head gl_holders;
struct list_head gl_waiters1; /* HIF_MUTEX */
struct list_head gl_waiters3; /* HIF_PROMOTE */
int gl_waiters2; /* GIF_DEMOTE */
const struct gfs2_glock_operations *gl_ops;