[deliverable/linux.git] / drivers / staging / lustre / lustre / llite / super25.c

/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2011, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 */

#define DEBUG_SUBSYSTEM S_LLITE

#include <linux/module.h>
#include <linux/types.h>
#include "../include/lustre_lite.h"
#include "../include/lustre_ha.h"
#include "../include/lustre_dlm.h"
#include <linux/init.h>
#include <linux/fs.h>
#include "../include/lprocfs_status.h"
#include "llite_internal.h"

static struct kmem_cache *ll_inode_cachep;

static struct inode *ll_alloc_inode(struct super_block *sb)
{
	struct ll_inode_info *lli;
	ll_stats_ops_tally(ll_s2sbi(sb), LPROC_LL_ALLOC_INODE, 1);
	OBD_SLAB_ALLOC_PTR_GFP(lli, ll_inode_cachep, GFP_NOFS);
	if (lli == NULL)
		return NULL;

	inode_init_once(&lli->lli_vfs_inode);
	return &lli->lli_vfs_inode;
}

static void ll_inode_destroy_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	struct ll_inode_info *ptr = ll_i2info(inode);
	OBD_SLAB_FREE_PTR(ptr, ll_inode_cachep);
}

static void ll_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, ll_inode_destroy_callback);
}

/* exported operations */
struct super_operations lustre_super_operations = {
	.alloc_inode   = ll_alloc_inode,
	.destroy_inode = ll_destroy_inode,
	.evict_inode   = ll_delete_inode,
	.put_super     = ll_put_super,
	.statfs	= ll_statfs,
	.umount_begin  = ll_umount_begin,
	.remount_fs    = ll_remount_fs,
	.show_options  = ll_show_options,
};
MODULE_ALIAS_FS("lustre");

void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg));

static int __init init_lustre_lite(void)
{
	struct proc_dir_entry *entry;
	lnet_process_id_t lnet_id;
	struct timeval tv;
	int i, rc, seed[2];

	CLASSERT(sizeof(LUSTRE_VOLATILE_HDR) == LUSTRE_VOLATILE_HDR_LEN + 1);

	/* print an address of _any_ initialized kernel symbol from this
	 * module, to allow debugging with gdb that doesn't support data
	 * symbols from modules.*/
	CDEBUG(D_INFO, "Lustre client module (%p).\n",
	       &lustre_super_operations);

	rc = -ENOMEM;
	ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
					    sizeof(struct ll_inode_info),
					    0, SLAB_HWCACHE_ALIGN, NULL);
	if (ll_inode_cachep == NULL)
		goto out_cache;

	ll_file_data_slab = kmem_cache_create("ll_file_data",
						 sizeof(struct ll_file_data), 0,
						 SLAB_HWCACHE_ALIGN, NULL);
	if (ll_file_data_slab == NULL)
		goto out_cache;

	ll_remote_perm_cachep = kmem_cache_create("ll_remote_perm_cache",
						  sizeof(struct ll_remote_perm),
						      0, 0, NULL);
	if (ll_remote_perm_cachep == NULL)
		goto out_cache;

	ll_rmtperm_hash_cachep = kmem_cache_create("ll_rmtperm_hash_cache",
						   REMOTE_PERM_HASHSIZE *
						   sizeof(struct list_head),
						   0, 0, NULL);
	if (ll_rmtperm_hash_cachep == NULL)
		goto out_cache;

	entry = lprocfs_register("llite", proc_lustre_root, NULL, NULL);
	if (IS_ERR(entry)) {
		rc = PTR_ERR(entry);
		CERROR("cannot register '/proc/fs/lustre/llite': rc = %d\n",
		       rc);
		goto out_cache;
	}

	proc_lustre_fs_root = entry;

	cfs_get_random_bytes(seed, sizeof(seed));

	/* Nodes with small feet have little entropy. The NID for this
	 * node gives the most entropy in the low bits */
	for (i = 0;; i++) {
		if (LNetGetId(i, &lnet_id) == -ENOENT)
			break;

		if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND)
			seed[0] ^= LNET_NIDADDR(lnet_id.nid);
	}

	do_gettimeofday(&tv);
	cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);

	init_timer(&ll_capa_timer);
	ll_capa_timer.function = ll_capa_timer_callback;
	rc = ll_capa_thread_start();
	if (rc != 0)
		goto out_proc;

	rc = vvp_global_init();
	if (rc != 0)
		goto out_capa;

	rc = ll_xattr_init();
	if (rc != 0)
		goto out_vvp;

	lustre_register_client_fill_super(ll_fill_super);
	lustre_register_kill_super_cb(ll_kill_super);
	lustre_register_client_process_config(ll_process_config);

	return 0;

out_vvp:
	vvp_global_fini();
out_capa:
	del_timer(&ll_capa_timer);
	ll_capa_thread_stop();
out_proc:
	lprocfs_remove(&proc_lustre_fs_root);
out_cache:
	if (ll_inode_cachep != NULL)
		kmem_cache_destroy(ll_inode_cachep);

	if (ll_file_data_slab != NULL)
		kmem_cache_destroy(ll_file_data_slab);

	if (ll_remote_perm_cachep != NULL)
		kmem_cache_destroy(ll_remote_perm_cachep);

	if (ll_rmtperm_hash_cachep != NULL)
		kmem_cache_destroy(ll_rmtperm_hash_cachep);

	return rc;
}

static void __exit exit_lustre_lite(void)
{
	lustre_register_client_fill_super(NULL);
	lustre_register_kill_super_cb(NULL);
	lustre_register_client_process_config(NULL);

	lprocfs_remove(&proc_lustre_fs_root);

	ll_xattr_fini();
	vvp_global_fini();
	del_timer(&ll_capa_timer);
	ll_capa_thread_stop();
	LASSERTF(capa_count[CAPA_SITE_CLIENT] == 0,
		 "client remaining capa count %d\n",
		 capa_count[CAPA_SITE_CLIENT]);

	kmem_cache_destroy(ll_inode_cachep);
	kmem_cache_destroy(ll_rmtperm_hash_cachep);

	kmem_cache_destroy(ll_remote_perm_cachep);

	kmem_cache_destroy(ll_file_data_slab);
}

MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
MODULE_DESCRIPTION("Lustre Lite Client File System");
MODULE_LICENSE("GPL");

module_init(init_lustre_lite);
module_exit(exit_lustre_lite);
Commit	Line	Data
d7e09d03 PT	1	/*
	2	* GPL HEADER START
	3	*
	4	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 only,
	8	* as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful, but
	11	* WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	* General Public License version 2 for more details (a copy is included
	14	* in the LICENSE file that accompanied this code).
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* version 2 along with this program; If not, see
	18	* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
	19	*
	20	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
	21	* CA 95054 USA or visit www.sun.com if you need additional information or
	22	* have any questions.
	23	*
	24	* GPL HEADER END
	25	*/
	26	/*
	27	* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
	28	* Use is subject to license terms.
	29	*
	30	* Copyright (c) 2011, Intel Corporation.
	31	*/
	32	/*
	33	* This file is part of Lustre, http://www.lustre.org/
	34	* Lustre is a trademark of Sun Microsystems, Inc.
	35	*/
	36
	37	#define DEBUG_SUBSYSTEM S_LLITE
	38
	39	#include <linux/module.h>
	40	#include <linux/types.h>
67a235f5 GKH	41	#include "../include/lustre_lite.h"
	42	#include "../include/lustre_ha.h"
	43	#include "../include/lustre_dlm.h"
d7e09d03 PT	44	#include <linux/init.h>
d7e09d03 PT	45	#include <linux/fs.h>
67a235f5	46	#include "../include/lprocfs_status.h"
d7e09d03 PT	47	#include "llite_internal.h"
	48
	49	static struct kmem_cache *ll_inode_cachep;
	50
	51	static struct inode ll_alloc_inode(struct super_block sb)
	52	{
	53	struct ll_inode_info *lli;
	54	ll_stats_ops_tally(ll_s2sbi(sb), LPROC_LL_ALLOC_INODE, 1);
0be19afa	55	OBD_SLAB_ALLOC_PTR_GFP(lli, ll_inode_cachep, GFP_NOFS);
d7e09d03 PT	56	if (lli == NULL)
	57	return NULL;
	58
	59	inode_init_once(&lli->lli_vfs_inode);
	60	return &lli->lli_vfs_inode;
	61	}
	62
	63	static void ll_inode_destroy_callback(struct rcu_head *head)
	64	{
	65	struct inode *inode = container_of(head, struct inode, i_rcu);
	66	struct ll_inode_info *ptr = ll_i2info(inode);
	67	OBD_SLAB_FREE_PTR(ptr, ll_inode_cachep);
	68	}
	69
	70	static void ll_destroy_inode(struct inode *inode)
	71	{
	72	call_rcu(&inode->i_rcu, ll_inode_destroy_callback);
	73	}
	74
d7e09d03	75	/* exported operations */
9d0b2b7a	76	struct super_operations lustre_super_operations = {
d7e09d03 PT	77	.alloc_inode = ll_alloc_inode,
	78	.destroy_inode = ll_destroy_inode,
	79	.evict_inode = ll_delete_inode,
	80	.put_super = ll_put_super,
	81	.statfs = ll_statfs,
	82	.umount_begin = ll_umount_begin,
	83	.remount_fs = ll_remount_fs,
	84	.show_options = ll_show_options,
	85	};
69d19388	86	MODULE_ALIAS_FS("lustre");
d7e09d03 PT	87
	88	void lustre_register_client_process_config(int (cpc)(struct lustre_cfg lcfg));
	89
d7e09d03 PT	90	static int __init init_lustre_lite(void)
d7e09d03 PT	91	{
081fa9df	92	struct proc_dir_entry *entry;
d7e09d03	93	lnet_process_id_t lnet_id;
081fa9df JH	94	struct timeval tv;
081fa9df JH	95	int i, rc, seed[2];
d7e09d03 PT	96
	97	CLASSERT(sizeof(LUSTRE_VOLATILE_HDR) == LUSTRE_VOLATILE_HDR_LEN + 1);
	98
	99	/* print an address of _any_ initialized kernel symbol from this
	100	* module, to allow debugging with gdb that doesn't support data
	101	* symbols from modules.*/
	102	CDEBUG(D_INFO, "Lustre client module (%p).\n",
	103	&lustre_super_operations);
	104
081fa9df JH	105	rc = -ENOMEM;
	106	ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
	107	sizeof(struct ll_inode_info),
	108	0, SLAB_HWCACHE_ALIGN, NULL);
	109	if (ll_inode_cachep == NULL)
	110	goto out_cache;
	111
d7e09d03 PT	112	ll_file_data_slab = kmem_cache_create("ll_file_data",
	113	sizeof(struct ll_file_data), 0,
	114	SLAB_HWCACHE_ALIGN, NULL);
081fa9df JH	115	if (ll_file_data_slab == NULL)
081fa9df JH	116	goto out_cache;
d7e09d03 PT	117
	118	ll_remote_perm_cachep = kmem_cache_create("ll_remote_perm_cache",
	119	sizeof(struct ll_remote_perm),
	120	0, 0, NULL);
081fa9df JH	121	if (ll_remote_perm_cachep == NULL)
081fa9df JH	122	goto out_cache;
d7e09d03 PT	123
	124	ll_rmtperm_hash_cachep = kmem_cache_create("ll_rmtperm_hash_cache",
	125	REMOTE_PERM_HASHSIZE *
	126	sizeof(struct list_head),
	127	0, 0, NULL);
081fa9df JH	128	if (ll_rmtperm_hash_cachep == NULL)
	129	goto out_cache;
	130
	131	entry = lprocfs_register("llite", proc_lustre_root, NULL, NULL);
	132	if (IS_ERR(entry)) {
	133	rc = PTR_ERR(entry);
	134	CERROR("cannot register '/proc/fs/lustre/llite': rc = %d\n",
	135	rc);
	136	goto out_cache;
d7e09d03 PT	137	}
d7e09d03 PT	138
081fa9df	139	proc_lustre_fs_root = entry;
d7e09d03 PT	140
	141	cfs_get_random_bytes(seed, sizeof(seed));
	142
081fa9df JH	143	/* Nodes with small feet have little entropy. The NID for this
	144	* node gives the most entropy in the low bits */
	145	for (i = 0;; i++) {
	146	if (LNetGetId(i, &lnet_id) == -ENOENT)
d7e09d03	147	break;
081fa9df JH	148
081fa9df JH	149	if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND)
d7e09d03	150	seed[0] ^= LNET_NIDADDR(lnet_id.nid);
d7e09d03 PT	151	}
	152
	153	do_gettimeofday(&tv);
	154	cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
	155
	156	init_timer(&ll_capa_timer);
	157	ll_capa_timer.function = ll_capa_timer_callback;
	158	rc = ll_capa_thread_start();
081fa9df JH	159	if (rc != 0)
081fa9df JH	160	goto out_proc;
d7e09d03	161
081fa9df JH	162	rc = vvp_global_init();
	163	if (rc != 0)
	164	goto out_capa;
	165
	166	rc = ll_xattr_init();
	167	if (rc != 0)
	168	goto out_vvp;
	169
	170	lustre_register_client_fill_super(ll_fill_super);
	171	lustre_register_kill_super_cb(ll_kill_super);
	172	lustre_register_client_process_config(ll_process_config);
	173
	174	return 0;
	175
	176	out_vvp:
	177	vvp_global_fini();
	178	out_capa:
	179	del_timer(&ll_capa_timer);
	180	ll_capa_thread_stop();
	181	out_proc:
	182	lprocfs_remove(&proc_lustre_fs_root);
	183	out_cache:
	184	if (ll_inode_cachep != NULL)
	185	kmem_cache_destroy(ll_inode_cachep);
	186
	187	if (ll_file_data_slab != NULL)
	188	kmem_cache_destroy(ll_file_data_slab);
	189
	190	if (ll_remote_perm_cachep != NULL)
	191	kmem_cache_destroy(ll_remote_perm_cachep);
	192
	193	if (ll_rmtperm_hash_cachep != NULL)
	194	kmem_cache_destroy(ll_rmtperm_hash_cachep);
7fc1f831	195
d7e09d03 PT	196	return rc;
	197	}
	198
	199	static void __exit exit_lustre_lite(void)
	200	{
081fa9df JH	201	lustre_register_client_fill_super(NULL);
	202	lustre_register_kill_super_cb(NULL);
	203	lustre_register_client_process_config(NULL);
	204
	205	lprocfs_remove(&proc_lustre_fs_root);
	206
7fc1f831	207	ll_xattr_fini();
d7e09d03 PT	208	vvp_global_fini();
	209	del_timer(&ll_capa_timer);
	210	ll_capa_thread_stop();
	211	LASSERTF(capa_count[CAPA_SITE_CLIENT] == 0,
	212	"client remaining capa count %d\n",
	213	capa_count[CAPA_SITE_CLIENT]);
	214
081fa9df	215	kmem_cache_destroy(ll_inode_cachep);
d7e09d03	216	kmem_cache_destroy(ll_rmtperm_hash_cachep);
d7e09d03 PT	217
d7e09d03 PT	218	kmem_cache_destroy(ll_remote_perm_cachep);
d7e09d03 PT	219
d7e09d03 PT	220	kmem_cache_destroy(ll_file_data_slab);
d7e09d03 PT	221	}
	222
	223	MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
	224	MODULE_DESCRIPTION("Lustre Lite Client File System");
	225	MODULE_LICENSE("GPL");
	226
	227	module_init(init_lustre_lite);
	228	module_exit(exit_lustre_lite);