This source file includes following definitions.
- fscache_max_active_sysctl
- fscache_init
- fscache_exit
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8 #define FSCACHE_DEBUG_LEVEL CACHE
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/sched.h>
12 #include <linux/completion.h>
13 #include <linux/slab.h>
14 #include <linux/seq_file.h>
15 #define CREATE_TRACE_POINTS
16 #include "internal.h"
17
18 MODULE_DESCRIPTION("FS Cache Manager");
19 MODULE_AUTHOR("Red Hat, Inc.");
20 MODULE_LICENSE("GPL");
21
22 unsigned fscache_defer_lookup = 1;
23 module_param_named(defer_lookup, fscache_defer_lookup, uint,
24 S_IWUSR | S_IRUGO);
25 MODULE_PARM_DESC(fscache_defer_lookup,
26 "Defer cookie lookup to background thread");
27
28 unsigned fscache_defer_create = 1;
29 module_param_named(defer_create, fscache_defer_create, uint,
30 S_IWUSR | S_IRUGO);
31 MODULE_PARM_DESC(fscache_defer_create,
32 "Defer cookie creation to background thread");
33
34 unsigned fscache_debug;
35 module_param_named(debug, fscache_debug, uint,
36 S_IWUSR | S_IRUGO);
37 MODULE_PARM_DESC(fscache_debug,
38 "FS-Cache debugging mask");
39
40 struct kobject *fscache_root;
41 struct workqueue_struct *fscache_object_wq;
42 struct workqueue_struct *fscache_op_wq;
43
44 DEFINE_PER_CPU(wait_queue_head_t, fscache_object_cong_wait);
45
46
47 static unsigned fscache_object_max_active = 4;
48 static unsigned fscache_op_max_active = 2;
49
50 #ifdef CONFIG_SYSCTL
51 static struct ctl_table_header *fscache_sysctl_header;
52
53 static int fscache_max_active_sysctl(struct ctl_table *table, int write,
54 void __user *buffer,
55 size_t *lenp, loff_t *ppos)
56 {
57 struct workqueue_struct **wqp = table->extra1;
58 unsigned int *datap = table->data;
59 int ret;
60
61 ret = proc_dointvec(table, write, buffer, lenp, ppos);
62 if (ret == 0)
63 workqueue_set_max_active(*wqp, *datap);
64 return ret;
65 }
66
67 static struct ctl_table fscache_sysctls[] = {
68 {
69 .procname = "object_max_active",
70 .data = &fscache_object_max_active,
71 .maxlen = sizeof(unsigned),
72 .mode = 0644,
73 .proc_handler = fscache_max_active_sysctl,
74 .extra1 = &fscache_object_wq,
75 },
76 {
77 .procname = "operation_max_active",
78 .data = &fscache_op_max_active,
79 .maxlen = sizeof(unsigned),
80 .mode = 0644,
81 .proc_handler = fscache_max_active_sysctl,
82 .extra1 = &fscache_op_wq,
83 },
84 {}
85 };
86
87 static struct ctl_table fscache_sysctls_root[] = {
88 {
89 .procname = "fscache",
90 .mode = 0555,
91 .child = fscache_sysctls,
92 },
93 {}
94 };
95 #endif
96
97
98
99
100 static int __init fscache_init(void)
101 {
102 unsigned int nr_cpus = num_possible_cpus();
103 unsigned int cpu;
104 int ret;
105
106 fscache_object_max_active =
107 clamp_val(nr_cpus,
108 fscache_object_max_active, WQ_UNBOUND_MAX_ACTIVE);
109
110 ret = -ENOMEM;
111 fscache_object_wq = alloc_workqueue("fscache_object", WQ_UNBOUND,
112 fscache_object_max_active);
113 if (!fscache_object_wq)
114 goto error_object_wq;
115
116 fscache_op_max_active =
117 clamp_val(fscache_object_max_active / 2,
118 fscache_op_max_active, WQ_UNBOUND_MAX_ACTIVE);
119
120 ret = -ENOMEM;
121 fscache_op_wq = alloc_workqueue("fscache_operation", WQ_UNBOUND,
122 fscache_op_max_active);
123 if (!fscache_op_wq)
124 goto error_op_wq;
125
126 for_each_possible_cpu(cpu)
127 init_waitqueue_head(&per_cpu(fscache_object_cong_wait, cpu));
128
129 ret = fscache_proc_init();
130 if (ret < 0)
131 goto error_proc;
132
133 #ifdef CONFIG_SYSCTL
134 ret = -ENOMEM;
135 fscache_sysctl_header = register_sysctl_table(fscache_sysctls_root);
136 if (!fscache_sysctl_header)
137 goto error_sysctl;
138 #endif
139
140 fscache_cookie_jar = kmem_cache_create("fscache_cookie_jar",
141 sizeof(struct fscache_cookie),
142 0, 0, NULL);
143 if (!fscache_cookie_jar) {
144 pr_notice("Failed to allocate a cookie jar\n");
145 ret = -ENOMEM;
146 goto error_cookie_jar;
147 }
148
149 fscache_root = kobject_create_and_add("fscache", kernel_kobj);
150 if (!fscache_root)
151 goto error_kobj;
152
153 pr_notice("Loaded\n");
154 return 0;
155
156 error_kobj:
157 kmem_cache_destroy(fscache_cookie_jar);
158 error_cookie_jar:
159 #ifdef CONFIG_SYSCTL
160 unregister_sysctl_table(fscache_sysctl_header);
161 error_sysctl:
162 #endif
163 fscache_proc_cleanup();
164 error_proc:
165 destroy_workqueue(fscache_op_wq);
166 error_op_wq:
167 destroy_workqueue(fscache_object_wq);
168 error_object_wq:
169 return ret;
170 }
171
172 fs_initcall(fscache_init);
173
174
175
176
177 static void __exit fscache_exit(void)
178 {
179 _enter("");
180
181 kobject_put(fscache_root);
182 kmem_cache_destroy(fscache_cookie_jar);
183 #ifdef CONFIG_SYSCTL
184 unregister_sysctl_table(fscache_sysctl_header);
185 #endif
186 fscache_proc_cleanup();
187 destroy_workqueue(fscache_op_wq);
188 destroy_workqueue(fscache_object_wq);
189 pr_notice("Unloaded\n");
190 }
191
192 module_exit(fscache_exit);