1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * (C) 2001 Clemson University and The University of Chicago
4  *
5  * Changes by Acxiom Corporation to add proc file handler for pvfs2 client
6  * parameters, Copyright Acxiom Corporation, 2005.
7  *
8  * See COPYING in top-level directory.
9  */
10 
11 #include "protocol.h"
12 #include "orangefs-kernel.h"
13 #include "orangefs-debugfs.h"
14 #include "orangefs-sysfs.h"
15 
16 /* ORANGEFS_VERSION is a ./configure define */
17 #ifndef ORANGEFS_VERSION
18 #define ORANGEFS_VERSION "upstream"
19 #endif
20 
21 /*
22  * global variables declared here
23  */
24 
25 struct orangefs_stats orangefs_stats;
26 
27 /* the size of the hash tables for ops in progress */
28 int hash_table_size = 509;
29 
30 static ulong module_parm_debug_mask;
31 __u64 orangefs_gossip_debug_mask;
32 int op_timeout_secs = ORANGEFS_DEFAULT_OP_TIMEOUT_SECS;
33 int slot_timeout_secs = ORANGEFS_DEFAULT_SLOT_TIMEOUT_SECS;
34 int orangefs_cache_timeout_msecs = 500;
35 int orangefs_dcache_timeout_msecs = 50;
36 int orangefs_getattr_timeout_msecs = 50;
37 
38 MODULE_LICENSE("GPL");
39 MODULE_AUTHOR("ORANGEFS Development Team");
40 MODULE_DESCRIPTION("The Linux Kernel VFS interface to ORANGEFS");
41 MODULE_PARM_DESC(module_parm_debug_mask, "debugging level (see orangefs-debug.h for values)");
42 MODULE_PARM_DESC(op_timeout_secs, "Operation timeout in seconds");
43 MODULE_PARM_DESC(slot_timeout_secs, "Slot timeout in seconds");
44 MODULE_PARM_DESC(hash_table_size,
45 		 "size of hash table for operations in progress");
46 
47 static struct file_system_type orangefs_fs_type = {
48 	.name = "pvfs2",
49 	.mount = orangefs_mount,
50 	.kill_sb = orangefs_kill_sb,
51 	.owner = THIS_MODULE,
52 };
53 
54 module_param(hash_table_size, int, 0);
55 module_param(module_parm_debug_mask, ulong, 0644);
56 module_param(op_timeout_secs, int, 0);
57 module_param(slot_timeout_secs, int, 0);
58 
59 /*
60  * Blocks non-priority requests from being queued for servicing.  This
61  * could be used for protecting the request list data structure, but
62  * for now it's only being used to stall the op addition to the request
63  * list
64  */
65 DEFINE_MUTEX(orangefs_request_mutex);
66 
67 /* hash table for storing operations waiting for matching downcall */
68 struct list_head *orangefs_htable_ops_in_progress;
69 DEFINE_SPINLOCK(orangefs_htable_ops_in_progress_lock);
70 
71 /* list for queueing upcall operations */
72 LIST_HEAD(orangefs_request_list);
73 
74 /* used to protect the above orangefs_request_list */
75 DEFINE_SPINLOCK(orangefs_request_list_lock);
76 
77 /* used for incoming request notification */
78 DECLARE_WAIT_QUEUE_HEAD(orangefs_request_list_waitq);
79 
orangefs_init(void)80 static int __init orangefs_init(void)
81 {
82 	int ret;
83 	__u32 i = 0;
84 
85 	if (op_timeout_secs < 0)
86 		op_timeout_secs = 0;
87 
88 	if (slot_timeout_secs < 0)
89 		slot_timeout_secs = 0;
90 
91 	/* initialize global book keeping data structures */
92 	ret = op_cache_initialize();
93 	if (ret < 0)
94 		goto out;
95 
96 	ret = orangefs_inode_cache_initialize();
97 	if (ret < 0)
98 		goto cleanup_op;
99 
100 	orangefs_htable_ops_in_progress =
101 	    kcalloc(hash_table_size, sizeof(struct list_head), GFP_KERNEL);
102 	if (!orangefs_htable_ops_in_progress) {
103 		ret = -ENOMEM;
104 		goto cleanup_inode;
105 	}
106 
107 	/* initialize a doubly linked at each hash table index */
108 	for (i = 0; i < hash_table_size; i++)
109 		INIT_LIST_HEAD(&orangefs_htable_ops_in_progress[i]);
110 
111 	ret = fsid_key_table_initialize();
112 	if (ret < 0)
113 		goto cleanup_progress_table;
114 
115 	/*
116 	 * Build the contents of /sys/kernel/debug/orangefs/debug-help
117 	 * from the keywords in the kernel keyword/mask array.
118 	 *
119 	 * The keywords in the client keyword/mask array are
120 	 * unknown at boot time.
121 	 *
122 	 * orangefs_prepare_debugfs_help_string will be used again
123 	 * later to rebuild the debug-help-string after the client starts
124 	 * and passes along the needed info. The argument signifies
125 	 * which time orangefs_prepare_debugfs_help_string is being
126 	 * called.
127 	 */
128 	ret = orangefs_prepare_debugfs_help_string(1);
129 	if (ret)
130 		goto cleanup_key_table;
131 
132 	orangefs_debugfs_init(module_parm_debug_mask);
133 
134 	ret = orangefs_sysfs_init();
135 	if (ret)
136 		goto sysfs_init_failed;
137 
138 	/* Initialize the orangefsdev subsystem. */
139 	ret = orangefs_dev_init();
140 	if (ret < 0) {
141 		gossip_err("%s: could not initialize device subsystem %d!\n",
142 			   __func__,
143 			   ret);
144 		goto cleanup_device;
145 	}
146 
147 	ret = register_filesystem(&orangefs_fs_type);
148 	if (ret == 0) {
149 		pr_info("%s: module version %s loaded\n",
150 			__func__,
151 			ORANGEFS_VERSION);
152 		goto out;
153 	}
154 
155 	orangefs_sysfs_exit();
156 
157 cleanup_device:
158 	orangefs_dev_cleanup();
159 
160 sysfs_init_failed:
161 	orangefs_debugfs_cleanup();
162 
163 cleanup_key_table:
164 	fsid_key_table_finalize();
165 
166 cleanup_progress_table:
167 	kfree(orangefs_htable_ops_in_progress);
168 
169 cleanup_inode:
170 	orangefs_inode_cache_finalize();
171 
172 cleanup_op:
173 	op_cache_finalize();
174 
175 out:
176 	return ret;
177 }
178 
orangefs_exit(void)179 static void __exit orangefs_exit(void)
180 {
181 	int i = 0;
182 	gossip_debug(GOSSIP_INIT_DEBUG, "orangefs: orangefs_exit called\n");
183 
184 	unregister_filesystem(&orangefs_fs_type);
185 	orangefs_debugfs_cleanup();
186 	orangefs_sysfs_exit();
187 	fsid_key_table_finalize();
188 	orangefs_dev_cleanup();
189 	BUG_ON(!list_empty(&orangefs_request_list));
190 	for (i = 0; i < hash_table_size; i++)
191 		BUG_ON(!list_empty(&orangefs_htable_ops_in_progress[i]));
192 
193 	orangefs_inode_cache_finalize();
194 	op_cache_finalize();
195 
196 	kfree(orangefs_htable_ops_in_progress);
197 
198 	pr_info("orangefs: module version %s unloaded\n", ORANGEFS_VERSION);
199 }
200 
201 /*
202  * What we do in this function is to walk the list of operations
203  * that are in progress in the hash table and mark them as purged as well.
204  */
purge_inprogress_ops(void)205 void purge_inprogress_ops(void)
206 {
207 	int i;
208 
209 	for (i = 0; i < hash_table_size; i++) {
210 		struct orangefs_kernel_op_s *op;
211 		struct orangefs_kernel_op_s *next;
212 
213 		spin_lock(&orangefs_htable_ops_in_progress_lock);
214 		list_for_each_entry_safe(op,
215 					 next,
216 					 &orangefs_htable_ops_in_progress[i],
217 					 list) {
218 			set_op_state_purged(op);
219 			gossip_debug(GOSSIP_DEV_DEBUG,
220 				     "%s: op:%s: op_state:%d: process:%s:\n",
221 				     __func__,
222 				     get_opname_string(op),
223 				     op->op_state,
224 				     current->comm);
225 		}
226 		spin_unlock(&orangefs_htable_ops_in_progress_lock);
227 	}
228 }
229 
230 module_init(orangefs_init);
231 module_exit(orangefs_exit);
232