kernel-ark/fs/gfs2/main.c
Steven Whitehouse f42ab08529 GFS2: Optimise glock lru and end of life inodes
The GLF_LRU flag introduced in the previous patch can be
used to check if a glock is on the lru list when a new
holder is queued and if so remove it, without having first
to get the lru_lock.

The main purpose of this patch however is to optimise the
glocks left over when an inode at end of life is being
evicted. Previously such glocks were left with the GLF_LFLUSH
flag set, so that when reclaimed, each one required a log flush.
This patch resets the GLF_LFLUSH flag when there is nothing
left to flush thus preventing later log flushes as glocks are
reused or demoted.

In order to do this, we need to keep track of the number of
revokes which are outstanding, and also to clear the GLF_LFLUSH
bit after a log commit when only revokes have been processed.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2011-04-20 09:01:17 +01:00

216 lines
4.8 KiB
C

/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2006 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
* of the GNU General Public License version 2.
*/
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/gfs2_ondisk.h>
#include <linux/rcupdate.h>
#include <linux/rculist_bl.h>
#include <asm/atomic.h>
#include "gfs2.h"
#include "incore.h"
#include "super.h"
#include "sys.h"
#include "util.h"
#include "glock.h"
#include "quota.h"
#include "recovery.h"
#include "dir.h"
static struct shrinker qd_shrinker = {
.shrink = gfs2_shrink_qd_memory,
.seeks = DEFAULT_SEEKS,
};
static void gfs2_init_inode_once(void *foo)
{
struct gfs2_inode *ip = foo;
inode_init_once(&ip->i_inode);
init_rwsem(&ip->i_rw_mutex);
INIT_LIST_HEAD(&ip->i_trunc_list);
ip->i_alloc = NULL;
}
static void gfs2_init_glock_once(void *foo)
{
struct gfs2_glock *gl = foo;
INIT_HLIST_BL_NODE(&gl->gl_list);
spin_lock_init(&gl->gl_spin);
INIT_LIST_HEAD(&gl->gl_holders);
INIT_LIST_HEAD(&gl->gl_lru);
INIT_LIST_HEAD(&gl->gl_ail_list);
atomic_set(&gl->gl_ail_count, 0);
atomic_set(&gl->gl_revokes, 0);
}
static void gfs2_init_gl_aspace_once(void *foo)
{
struct gfs2_glock *gl = foo;
struct address_space *mapping = (struct address_space *)(gl + 1);
gfs2_init_glock_once(gl);
address_space_init_once(mapping);
}
/**
* init_gfs2_fs - Register GFS2 as a filesystem
*
* Returns: 0 on success, error code on failure
*/
static int __init init_gfs2_fs(void)
{
int error;
gfs2_str2qstr(&gfs2_qdot, ".");
gfs2_str2qstr(&gfs2_qdotdot, "..");
error = gfs2_sys_init();
if (error)
return error;
error = gfs2_glock_init();
if (error)
goto fail;
error = -ENOMEM;
gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
sizeof(struct gfs2_glock),
0, 0,
gfs2_init_glock_once);
if (!gfs2_glock_cachep)
goto fail;
gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
sizeof(struct gfs2_glock) +
sizeof(struct address_space),
0, 0, gfs2_init_gl_aspace_once);
if (!gfs2_glock_aspace_cachep)
goto fail;
gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
sizeof(struct gfs2_inode),
0, SLAB_RECLAIM_ACCOUNT|
SLAB_MEM_SPREAD,
gfs2_init_inode_once);
if (!gfs2_inode_cachep)
goto fail;
gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
sizeof(struct gfs2_bufdata),
0, 0, NULL);
if (!gfs2_bufdata_cachep)
goto fail;
gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
sizeof(struct gfs2_rgrpd),
0, 0, NULL);
if (!gfs2_rgrpd_cachep)
goto fail;
gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
sizeof(struct gfs2_quota_data),
0, 0, NULL);
if (!gfs2_quotad_cachep)
goto fail;
register_shrinker(&qd_shrinker);
error = register_filesystem(&gfs2_fs_type);
if (error)
goto fail;
error = register_filesystem(&gfs2meta_fs_type);
if (error)
goto fail_unregister;
error = -ENOMEM;
gfs_recovery_wq = alloc_workqueue("gfs_recovery",
WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
if (!gfs_recovery_wq)
goto fail_wq;
gfs2_register_debugfs();
printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
return 0;
fail_wq:
unregister_filesystem(&gfs2meta_fs_type);
fail_unregister:
unregister_filesystem(&gfs2_fs_type);
fail:
unregister_shrinker(&qd_shrinker);
gfs2_glock_exit();
if (gfs2_quotad_cachep)
kmem_cache_destroy(gfs2_quotad_cachep);
if (gfs2_rgrpd_cachep)
kmem_cache_destroy(gfs2_rgrpd_cachep);
if (gfs2_bufdata_cachep)
kmem_cache_destroy(gfs2_bufdata_cachep);
if (gfs2_inode_cachep)
kmem_cache_destroy(gfs2_inode_cachep);
if (gfs2_glock_aspace_cachep)
kmem_cache_destroy(gfs2_glock_aspace_cachep);
if (gfs2_glock_cachep)
kmem_cache_destroy(gfs2_glock_cachep);
gfs2_sys_uninit();
return error;
}
/**
* exit_gfs2_fs - Unregister the file system
*
*/
static void __exit exit_gfs2_fs(void)
{
unregister_shrinker(&qd_shrinker);
gfs2_glock_exit();
gfs2_unregister_debugfs();
unregister_filesystem(&gfs2_fs_type);
unregister_filesystem(&gfs2meta_fs_type);
destroy_workqueue(gfs_recovery_wq);
rcu_barrier();
kmem_cache_destroy(gfs2_quotad_cachep);
kmem_cache_destroy(gfs2_rgrpd_cachep);
kmem_cache_destroy(gfs2_bufdata_cachep);
kmem_cache_destroy(gfs2_inode_cachep);
kmem_cache_destroy(gfs2_glock_aspace_cachep);
kmem_cache_destroy(gfs2_glock_cachep);
gfs2_sys_uninit();
}
MODULE_DESCRIPTION("Global File System");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL");
module_init(init_gfs2_fs);
module_exit(exit_gfs2_fs);