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01cec8c18f
linux/fs/gfs2/main.c
Bob Peterson b839dadae8 gfs2: new slab for transactions 
This patch adds a new slab for gfs2 transactions. That allows us to
reduce kernel memory fragmentation, have better organization of data
for analysis of vmcore dumps. A new centralized function is added to
free the slab objects, and it exposes use-after-free by giving
warnings if a transaction is freed while it still has bd elements
attached to its buffers or ail lists. We make sure to initialize
those transaction ail lists so we can check their integrity when freeing.

At a later time, we should add a slab initialization function to
make it more efficient, but for this initial patch I wanted to
minimize the impact.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
2020-06-05 21:24:25 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#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 <linux/atomic.h>
#include <linux/mempool.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"
#include "glops.h"
struct workqueue_struct *gfs2_control_wq;
static void gfs2_init_inode_once(void *foo)
{
struct gfs2_inode *ip = foo;
inode_init_once(&ip->i_inode);
atomic_set(&ip->i_sizehint, 0);
init_rwsem(&ip->i_rw_mutex);
INIT_LIST_HEAD(&ip->i_trunc_list);
ip->i_qadata = NULL;
gfs2_holder_mark_uninitialized(&ip->i_rgd_gh);
memset(&ip->i_res, 0, sizeof(ip->i_res));
RB_CLEAR_NODE(&ip->i_res.rs_node);
ip->i_hash_cache = NULL;
gfs2_holder_mark_uninitialized(&ip->i_iopen_gh);
}
static void gfs2_init_glock_once(void *foo)
{
struct gfs2_glock *gl = foo;
spin_lock_init(&gl->gl_lockref.lock);
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, "..");
gfs2_quota_hash_init();
error = gfs2_sys_init();
if (error)
return error;
error = list_lru_init(&gfs2_qd_lru);
if (error)
goto fail_lru;
error = gfs2_glock_init();
if (error)
goto fail_glock;
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_cachep1;
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_cachep2;
gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
sizeof(struct gfs2_inode),
0, SLAB_RECLAIM_ACCOUNT|
SLAB_MEM_SPREAD|
SLAB_ACCOUNT,
gfs2_init_inode_once);
if (!gfs2_inode_cachep)
goto fail_cachep3;
gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
sizeof(struct gfs2_bufdata),
0, 0, NULL);
if (!gfs2_bufdata_cachep)
goto fail_cachep4;
gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
sizeof(struct gfs2_rgrpd),
0, 0, NULL);
if (!gfs2_rgrpd_cachep)
goto fail_cachep5;
gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
sizeof(struct gfs2_quota_data),
0, 0, NULL);
if (!gfs2_quotad_cachep)
goto fail_cachep6;
gfs2_qadata_cachep = kmem_cache_create("gfs2_qadata",
sizeof(struct gfs2_qadata),
0, 0, NULL);
if (!gfs2_qadata_cachep)
goto fail_cachep7;
gfs2_trans_cachep = kmem_cache_create("gfs2_trans",
sizeof(struct gfs2_trans),
0, 0, NULL);
if (!gfs2_trans_cachep)
goto fail_cachep8;
error = register_shrinker(&gfs2_qd_shrinker);
if (error)
goto fail_shrinker;
error = register_filesystem(&gfs2_fs_type);
if (error)
goto fail_fs1;
error = register_filesystem(&gfs2meta_fs_type);
if (error)
goto fail_fs2;
error = -ENOMEM;
gfs_recovery_wq = alloc_workqueue("gfs_recovery",
WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
if (!gfs_recovery_wq)
goto fail_wq1;
gfs2_control_wq = alloc_workqueue("gfs2_control",
WQ_UNBOUND | WQ_FREEZABLE, 0);
if (!gfs2_control_wq)
goto fail_wq2;
gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0);
if (!gfs2_freeze_wq)
goto fail_wq3;
gfs2_page_pool = mempool_create_page_pool(64, 0);
if (!gfs2_page_pool)
goto fail_mempool;
gfs2_register_debugfs();
pr_info("GFS2 installed\n");
return 0;
fail_mempool:
destroy_workqueue(gfs2_freeze_wq);
fail_wq3:
destroy_workqueue(gfs2_control_wq);
fail_wq2:
destroy_workqueue(gfs_recovery_wq);
fail_wq1:
unregister_filesystem(&gfs2meta_fs_type);
fail_fs2:
unregister_filesystem(&gfs2_fs_type);
fail_fs1:
unregister_shrinker(&gfs2_qd_shrinker);
fail_shrinker:
kmem_cache_destroy(gfs2_trans_cachep);
fail_cachep8:
kmem_cache_destroy(gfs2_qadata_cachep);
fail_cachep7:
kmem_cache_destroy(gfs2_quotad_cachep);
fail_cachep6:
kmem_cache_destroy(gfs2_rgrpd_cachep);
fail_cachep5:
kmem_cache_destroy(gfs2_bufdata_cachep);
fail_cachep4:
kmem_cache_destroy(gfs2_inode_cachep);
fail_cachep3:
kmem_cache_destroy(gfs2_glock_aspace_cachep);
fail_cachep2:
kmem_cache_destroy(gfs2_glock_cachep);
fail_cachep1:
gfs2_glock_exit();
fail_glock:
list_lru_destroy(&gfs2_qd_lru);
fail_lru:
gfs2_sys_uninit();
return error;
}
/**
* exit_gfs2_fs - Unregister the file system
*
*/
static void __exit exit_gfs2_fs(void)
{
unregister_shrinker(&gfs2_qd_shrinker);
gfs2_glock_exit();
gfs2_unregister_debugfs();
unregister_filesystem(&gfs2_fs_type);
unregister_filesystem(&gfs2meta_fs_type);
destroy_workqueue(gfs_recovery_wq);
destroy_workqueue(gfs2_control_wq);
destroy_workqueue(gfs2_freeze_wq);
list_lru_destroy(&gfs2_qd_lru);
rcu_barrier();
mempool_destroy(gfs2_page_pool);
kmem_cache_destroy(gfs2_trans_cachep);
kmem_cache_destroy(gfs2_qadata_cachep);
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);
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