2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
11 * Linux module support routines.
14 #include <afsconfig.h>
15 #include "afs/param.h"
20 #include <linux/module.h> /* early to avoid printf->printk mapping */
21 #include "afs/sysincludes.h"
22 #include "afsincludes.h"
23 #include "h/unistd.h" /* For syscall numbers. */
26 #ifdef AFS_AMD64_LINUX20_ENV
27 #include <asm/ia32_unistd.h>
29 #ifdef AFS_SPARC64_LINUX20_ENV
30 #include <linux/ioctl32.h>
33 #include <linux/proc_fs.h>
34 #include <linux/slab.h>
35 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
36 #include <linux/init.h>
37 #include <linux/sched.h>
38 #include <linux/kernel.h>
41 extern struct file_system_type afs_fs_type;
43 #if !defined(AFS_LINUX24_ENV)
44 static long get_page_offset(void);
47 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
48 DEFINE_MUTEX(afs_global_lock);
49 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
50 DECLARE_MUTEX(afs_global_lock);
52 struct semaphore afs_global_lock = MUTEX;
54 int afs_global_owner = 0;
55 #if !defined(AFS_LINUX24_ENV)
56 unsigned long afs_linux_page_offset = 0; /* contains the PAGE_OFFSET value */
60 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
69 RWLOCK_INIT(&afs_xosi, "afs_xosi");
71 #if !defined(AFS_LINUX24_ENV)
72 /* obtain PAGE_OFFSET value */
73 afs_linux_page_offset = get_page_offset();
75 #ifndef AFS_S390_LINUX22_ENV
76 if (afs_linux_page_offset == 0) {
77 /* couldn't obtain page offset so can't continue */
78 printf("afs: Unable to obtain PAGE_OFFSET. Exiting..");
81 #endif /* AFS_S390_LINUX22_ENV */
82 #endif /* !defined(AFS_LINUX24_ENV) */
85 #ifdef AFS_LINUX26_ENV
86 osi_linux_nfssrv_init();
89 #ifndef LINUX_KEYRING_SUPPORT
90 err = osi_syscall_init();
94 err = afs_init_inodecache();
97 register_filesystem(&afs_fs_type);
99 #ifdef LINUX_KEYRING_SUPPORT
102 #ifdef AFS_LINUX24_ENV
110 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
118 osi_keyring_shutdown();
121 unregister_filesystem(&afs_fs_type);
123 afs_destroy_inodecache();
124 #ifdef AFS_LINUX26_ENV
125 osi_linux_nfssrv_shutdown();
127 osi_linux_free_afs_memory();
129 #ifdef AFS_LINUX24_ENV
136 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
137 MODULE_LICENSE("http://www.openafs.org/dl/license10.html");
138 module_init(afs_init);
139 module_exit(afs_cleanup);
143 #if !defined(AFS_LINUX24_ENV)
145 get_page_offset(void)
147 #if defined(AFS_PPC_LINUX22_ENV) || defined(AFS_SPARC64_LINUX20_ENV) || defined(AFS_SPARC_LINUX20_ENV) || defined(AFS_ALPHA_LINUX20_ENV) || defined(AFS_S390_LINUX22_ENV) || defined(AFS_IA64_LINUX20_ENV) || defined(AFS_PARISC_LINUX24_ENV) || defined(AFS_AMD64_LINUX20_ENV) || defined(AFS_PPC64_LINUX20_ENV)
150 struct task_struct *p, *q;
152 /* search backward thru the circular list */
153 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
154 read_lock(&tasklist_lock);
156 /* search backward thru the circular list */
157 #ifdef DEFINED_PREV_TASK
158 for (q = current; p = q; q = prev_task(p)) {
160 for (p = current; p; p = p->prev_task) {
163 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
164 read_unlock(&tasklist_lock);
166 return p->addr_limit.seg;
170 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
171 read_unlock(&tasklist_lock);
176 #endif /* !AFS_LINUX24_ENV */