summaryrefslogtreecommitdiffstats
path: root/fs/orangefs/orangefs-mod.c
blob: 2e5b03065f345a3e9f48d0401f0def348eeaa1e6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
/*
 * (C) 2001 Clemson University and The University of Chicago
 *
 * Changes by Acxiom Corporation to add proc file handler for pvfs2 client
 * parameters, Copyright Acxiom Corporation, 2005.
 *
 * See COPYING in top-level directory.
 */

#include "protocol.h"
#include "orangefs-kernel.h"
#include "orangefs-debugfs.h"
#include "orangefs-sysfs.h"

/* ORANGEFS_VERSION is a ./configure define */
#ifndef ORANGEFS_VERSION
#define ORANGEFS_VERSION "upstream"
#endif

/*
 * global variables declared here
 */

struct orangefs_stats orangefs_stats;

/* the size of the hash tables for ops in progress */
int hash_table_size = 509;

static ulong module_parm_debug_mask;
__u64 orangefs_gossip_debug_mask;
int op_timeout_secs = ORANGEFS_DEFAULT_OP_TIMEOUT_SECS;
int slot_timeout_secs = ORANGEFS_DEFAULT_SLOT_TIMEOUT_SECS;
int orangefs_dcache_timeout_msecs = 50;
int orangefs_getattr_timeout_msecs = 50;

MODULE_LICENSE("GPL");
MODULE_AUTHOR("ORANGEFS Development Team");
MODULE_DESCRIPTION("The Linux Kernel VFS interface to ORANGEFS");
MODULE_PARM_DESC(module_parm_debug_mask, "debugging level (see orangefs-debug.h for values)");
MODULE_PARM_DESC(op_timeout_secs, "Operation timeout in seconds");
MODULE_PARM_DESC(slot_timeout_secs, "Slot timeout in seconds");
MODULE_PARM_DESC(hash_table_size,
		 "size of hash table for operations in progress");

static struct file_system_type orangefs_fs_type = {
	.name = "pvfs2",
	.mount = orangefs_mount,
	.kill_sb = orangefs_kill_sb,
	.owner = THIS_MODULE,
};

module_param(hash_table_size, int, 0);
module_param(module_parm_debug_mask, ulong, 0644);
module_param(op_timeout_secs, int, 0);
module_param(slot_timeout_secs, int, 0);

/*
 * Blocks non-priority requests from being queued for servicing.  This
 * could be used for protecting the request list data structure, but
 * for now it's only being used to stall the op addition to the request
 * list
 */
DEFINE_MUTEX(orangefs_request_mutex);

/* hash table for storing operations waiting for matching downcall */
struct list_head *orangefs_htable_ops_in_progress;
DEFINE_SPINLOCK(orangefs_htable_ops_in_progress_lock);

/* list for queueing upcall operations */
LIST_HEAD(orangefs_request_list);

/* used to protect the above orangefs_request_list */
DEFINE_SPINLOCK(orangefs_request_list_lock);

/* used for incoming request notification */
DECLARE_WAIT_QUEUE_HEAD(orangefs_request_list_waitq);

static int __init orangefs_init(void)
{
	int ret = -1;
	__u32 i = 0;

	ret = bdi_init(&orangefs_backing_dev_info);

	if (ret)
		return ret;

	if (op_timeout_secs < 0)
		op_timeout_secs = 0;

	if (slot_timeout_secs < 0)
		slot_timeout_secs = 0;

	/* initialize global book keeping data structures */
	ret = op_cache_initialize();
	if (ret < 0)
		goto err;

	ret = orangefs_inode_cache_initialize();
	if (ret < 0)
		goto cleanup_op;

	orangefs_htable_ops_in_progress =
	    kcalloc(hash_table_size, sizeof(struct list_head), GFP_KERNEL);
	if (!orangefs_htable_ops_in_progress) {
		gossip_err("Failed to initialize op hashtable");
		ret = -ENOMEM;
		goto cleanup_inode;
	}

	/* initialize a doubly linked at each hash table index */
	for (i = 0; i < hash_table_size; i++)
		INIT_LIST_HEAD(&orangefs_htable_ops_in_progress[i]);

	ret = fsid_key_table_initialize();
	if (ret < 0)
		goto cleanup_progress_table;

	/*
	 * Build the contents of /sys/kernel/debug/orangefs/debug-help
	 * from the keywords in the kernel keyword/mask array.
	 *
	 * The keywords in the client keyword/mask array are
	 * unknown at boot time.
	 *
	 * orangefs_prepare_debugfs_help_string will be used again
	 * later to rebuild the debug-help file after the client starts
	 * and passes along the needed info. The argument signifies
	 * which time orangefs_prepare_debugfs_help_string is being
	 * called.
	 */
	ret = orangefs_prepare_debugfs_help_string(1);
	if (ret)
		goto cleanup_key_table;

	ret = orangefs_debugfs_init(module_parm_debug_mask);
	if (ret)
		goto debugfs_init_failed;

	ret = orangefs_sysfs_init();
	if (ret)
		goto sysfs_init_failed;

	/* Initialize the orangefsdev subsystem. */
	ret = orangefs_dev_init();
	if (ret < 0) {
		gossip_err("%s: could not initialize device subsystem %d!\n",
			   __func__,
			   ret);
		goto cleanup_device;
	}

	ret = register_filesystem(&orangefs_fs_type);
	if (ret == 0) {
		pr_info("orangefs: module version %s loaded\n", ORANGEFS_VERSION);
		ret = 0;
		goto out;
	}

	orangefs_sysfs_exit();

cleanup_device:
	orangefs_dev_cleanup();

sysfs_init_failed:

debugfs_init_failed:
	orangefs_debugfs_cleanup();

cleanup_key_table:
	fsid_key_table_finalize();

cleanup_progress_table:
	kfree(orangefs_htable_ops_in_progress);

cleanup_inode:
	orangefs_inode_cache_finalize();

cleanup_op:
	op_cache_finalize();

err:
	bdi_destroy(&orangefs_backing_dev_info);

out:
	return ret;
}

static void __exit orangefs_exit(void)
{
	int i = 0;
	gossip_debug(GOSSIP_INIT_DEBUG, "orangefs: orangefs_exit called\n");

	unregister_filesystem(&orangefs_fs_type);
	orangefs_debugfs_cleanup();
	orangefs_sysfs_exit();
	fsid_key_table_finalize();
	orangefs_dev_cleanup();
	BUG_ON(!list_empty(&orangefs_request_list));
	for (i = 0; i < hash_table_size; i++)
		BUG_ON(!list_empty(&orangefs_htable_ops_in_progress[i]));

	orangefs_inode_cache_finalize();
	op_cache_finalize();

	kfree(orangefs_htable_ops_in_progress);

	bdi_destroy(&orangefs_backing_dev_info);

	pr_info("orangefs: module version %s unloaded\n", ORANGEFS_VERSION);
}

/*
 * What we do in this function is to walk the list of operations
 * that are in progress in the hash table and mark them as purged as well.
 */
void purge_inprogress_ops(void)
{
	int i;

	for (i = 0; i < hash_table_size; i++) {
		struct orangefs_kernel_op_s *op;
		struct orangefs_kernel_op_s *next;

		spin_lock(&orangefs_htable_ops_in_progress_lock);
		list_for_each_entry_safe(op,
					 next,
					 &orangefs_htable_ops_in_progress[i],
					 list) {
			set_op_state_purged(op);
			gossip_debug(GOSSIP_DEV_DEBUG,
				     "%s: op:%s: op_state:%d: process:%s:\n",
				     __func__,
				     get_opname_string(op),
				     op->op_state,
				     current->comm);
		}
		spin_unlock(&orangefs_htable_ops_in_progress_lock);
	}
}

module_init(orangefs_init);
module_exit(orangefs_exit);