xref: /openbmc/linux/fs/gfs2/main.c (revision a7d48886)
1  // SPDX-License-Identifier: GPL-2.0-only
2  /*
3   * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
4   * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
5   */
6  
7  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8  
9  #include <linux/slab.h>
10  #include <linux/spinlock.h>
11  #include <linux/completion.h>
12  #include <linux/buffer_head.h>
13  #include <linux/module.h>
14  #include <linux/init.h>
15  #include <linux/gfs2_ondisk.h>
16  #include <linux/rcupdate.h>
17  #include <linux/rculist_bl.h>
18  #include <linux/atomic.h>
19  #include <linux/mempool.h>
20  
21  #include "gfs2.h"
22  #include "incore.h"
23  #include "super.h"
24  #include "sys.h"
25  #include "util.h"
26  #include "glock.h"
27  #include "quota.h"
28  #include "recovery.h"
29  #include "dir.h"
30  #include "glops.h"
31  
32  struct workqueue_struct *gfs2_control_wq;
33  
34  static void gfs2_init_inode_once(void *foo)
35  {
36  	struct gfs2_inode *ip = foo;
37  
38  	inode_init_once(&ip->i_inode);
39  	atomic_set(&ip->i_sizehint, 0);
40  	init_rwsem(&ip->i_rw_mutex);
41  	INIT_LIST_HEAD(&ip->i_trunc_list);
42  	INIT_LIST_HEAD(&ip->i_ordered);
43  	ip->i_qadata = NULL;
44  	gfs2_holder_mark_uninitialized(&ip->i_rgd_gh);
45  	memset(&ip->i_res, 0, sizeof(ip->i_res));
46  	RB_CLEAR_NODE(&ip->i_res.rs_node);
47  	ip->i_hash_cache = NULL;
48  	gfs2_holder_mark_uninitialized(&ip->i_iopen_gh);
49  }
50  
51  static void gfs2_init_glock_once(void *foo)
52  {
53  	struct gfs2_glock *gl = foo;
54  
55  	spin_lock_init(&gl->gl_lockref.lock);
56  	INIT_LIST_HEAD(&gl->gl_holders);
57  	INIT_LIST_HEAD(&gl->gl_lru);
58  	INIT_LIST_HEAD(&gl->gl_ail_list);
59  	atomic_set(&gl->gl_ail_count, 0);
60  	atomic_set(&gl->gl_revokes, 0);
61  }
62  
63  static void gfs2_init_gl_aspace_once(void *foo)
64  {
65  	struct gfs2_glock *gl = foo;
66  	struct address_space *mapping = (struct address_space *)(gl + 1);
67  
68  	gfs2_init_glock_once(gl);
69  	address_space_init_once(mapping);
70  }
71  
72  /**
73   * init_gfs2_fs - Register GFS2 as a filesystem
74   *
75   * Returns: 0 on success, error code on failure
76   */
77  
78  static int __init init_gfs2_fs(void)
79  {
80  	int error;
81  
82  	gfs2_str2qstr(&gfs2_qdot, ".");
83  	gfs2_str2qstr(&gfs2_qdotdot, "..");
84  	gfs2_quota_hash_init();
85  
86  	error = gfs2_sys_init();
87  	if (error)
88  		return error;
89  
90  	error = list_lru_init(&gfs2_qd_lru);
91  	if (error)
92  		goto fail_lru;
93  
94  	error = gfs2_glock_init();
95  	if (error)
96  		goto fail_glock;
97  
98  	error = -ENOMEM;
99  	gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
100  					      sizeof(struct gfs2_glock),
101  					      0, 0,
102  					      gfs2_init_glock_once);
103  	if (!gfs2_glock_cachep)
104  		goto fail_cachep1;
105  
106  	gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
107  					sizeof(struct gfs2_glock) +
108  					sizeof(struct address_space),
109  					0, 0, gfs2_init_gl_aspace_once);
110  
111  	if (!gfs2_glock_aspace_cachep)
112  		goto fail_cachep2;
113  
114  	gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
115  					      sizeof(struct gfs2_inode),
116  					      0,  SLAB_RECLAIM_ACCOUNT|
117  						  SLAB_MEM_SPREAD|
118  						  SLAB_ACCOUNT,
119  					      gfs2_init_inode_once);
120  	if (!gfs2_inode_cachep)
121  		goto fail_cachep3;
122  
123  	gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
124  						sizeof(struct gfs2_bufdata),
125  					        0, 0, NULL);
126  	if (!gfs2_bufdata_cachep)
127  		goto fail_cachep4;
128  
129  	gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
130  					      sizeof(struct gfs2_rgrpd),
131  					      0, 0, NULL);
132  	if (!gfs2_rgrpd_cachep)
133  		goto fail_cachep5;
134  
135  	gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
136  					       sizeof(struct gfs2_quota_data),
137  					       0, 0, NULL);
138  	if (!gfs2_quotad_cachep)
139  		goto fail_cachep6;
140  
141  	gfs2_qadata_cachep = kmem_cache_create("gfs2_qadata",
142  					       sizeof(struct gfs2_qadata),
143  					       0, 0, NULL);
144  	if (!gfs2_qadata_cachep)
145  		goto fail_cachep7;
146  
147  	gfs2_trans_cachep = kmem_cache_create("gfs2_trans",
148  					       sizeof(struct gfs2_trans),
149  					       0, 0, NULL);
150  	if (!gfs2_trans_cachep)
151  		goto fail_cachep8;
152  
153  	error = register_shrinker(&gfs2_qd_shrinker);
154  	if (error)
155  		goto fail_shrinker;
156  
157  	error = register_filesystem(&gfs2_fs_type);
158  	if (error)
159  		goto fail_fs1;
160  
161  	error = register_filesystem(&gfs2meta_fs_type);
162  	if (error)
163  		goto fail_fs2;
164  
165  	error = -ENOMEM;
166  	gfs_recovery_wq = alloc_workqueue("gfs_recovery",
167  					  WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
168  	if (!gfs_recovery_wq)
169  		goto fail_wq1;
170  
171  	gfs2_control_wq = alloc_workqueue("gfs2_control",
172  					  WQ_UNBOUND | WQ_FREEZABLE, 0);
173  	if (!gfs2_control_wq)
174  		goto fail_wq2;
175  
176  	gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0);
177  
178  	if (!gfs2_freeze_wq)
179  		goto fail_wq3;
180  
181  	gfs2_page_pool = mempool_create_page_pool(64, 0);
182  	if (!gfs2_page_pool)
183  		goto fail_mempool;
184  
185  	gfs2_register_debugfs();
186  
187  	pr_info("GFS2 installed\n");
188  
189  	return 0;
190  
191  fail_mempool:
192  	destroy_workqueue(gfs2_freeze_wq);
193  fail_wq3:
194  	destroy_workqueue(gfs2_control_wq);
195  fail_wq2:
196  	destroy_workqueue(gfs_recovery_wq);
197  fail_wq1:
198  	unregister_filesystem(&gfs2meta_fs_type);
199  fail_fs2:
200  	unregister_filesystem(&gfs2_fs_type);
201  fail_fs1:
202  	unregister_shrinker(&gfs2_qd_shrinker);
203  fail_shrinker:
204  	kmem_cache_destroy(gfs2_trans_cachep);
205  fail_cachep8:
206  	kmem_cache_destroy(gfs2_qadata_cachep);
207  fail_cachep7:
208  	kmem_cache_destroy(gfs2_quotad_cachep);
209  fail_cachep6:
210  	kmem_cache_destroy(gfs2_rgrpd_cachep);
211  fail_cachep5:
212  	kmem_cache_destroy(gfs2_bufdata_cachep);
213  fail_cachep4:
214  	kmem_cache_destroy(gfs2_inode_cachep);
215  fail_cachep3:
216  	kmem_cache_destroy(gfs2_glock_aspace_cachep);
217  fail_cachep2:
218  	kmem_cache_destroy(gfs2_glock_cachep);
219  fail_cachep1:
220  	gfs2_glock_exit();
221  fail_glock:
222  	list_lru_destroy(&gfs2_qd_lru);
223  fail_lru:
224  	gfs2_sys_uninit();
225  	return error;
226  }
227  
228  /**
229   * exit_gfs2_fs - Unregister the file system
230   *
231   */
232  
233  static void __exit exit_gfs2_fs(void)
234  {
235  	unregister_shrinker(&gfs2_qd_shrinker);
236  	gfs2_glock_exit();
237  	gfs2_unregister_debugfs();
238  	unregister_filesystem(&gfs2_fs_type);
239  	unregister_filesystem(&gfs2meta_fs_type);
240  	destroy_workqueue(gfs_recovery_wq);
241  	destroy_workqueue(gfs2_control_wq);
242  	destroy_workqueue(gfs2_freeze_wq);
243  	list_lru_destroy(&gfs2_qd_lru);
244  
245  	rcu_barrier();
246  
247  	mempool_destroy(gfs2_page_pool);
248  	kmem_cache_destroy(gfs2_trans_cachep);
249  	kmem_cache_destroy(gfs2_qadata_cachep);
250  	kmem_cache_destroy(gfs2_quotad_cachep);
251  	kmem_cache_destroy(gfs2_rgrpd_cachep);
252  	kmem_cache_destroy(gfs2_bufdata_cachep);
253  	kmem_cache_destroy(gfs2_inode_cachep);
254  	kmem_cache_destroy(gfs2_glock_aspace_cachep);
255  	kmem_cache_destroy(gfs2_glock_cachep);
256  
257  	gfs2_sys_uninit();
258  }
259  
260  MODULE_DESCRIPTION("Global File System");
261  MODULE_AUTHOR("Red Hat, Inc.");
262  MODULE_LICENSE("GPL");
263  
264  module_init(init_gfs2_fs);
265  module_exit(exit_gfs2_fs);
266  
267