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 #ifdef HAVE_KERNEL_LINUX_SEQ_FILE_H
42 #include <linux/seq_file.h>
45 extern struct file_system_type afs_fs_type;
47 #if !defined(AFS_LINUX24_ENV)
48 static long get_page_offset(void);
51 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
52 DEFINE_MUTEX(afs_global_lock);
53 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
54 DECLARE_MUTEX(afs_global_lock);
56 struct semaphore afs_global_lock = MUTEX;
58 int afs_global_owner = 0;
59 #if !defined(AFS_LINUX24_ENV)
60 unsigned long afs_linux_page_offset = 0; /* contains the PAGE_OFFSET value */
64 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
73 RWLOCK_INIT(&afs_xosi, "afs_xosi");
75 #if !defined(AFS_LINUX24_ENV)
76 /* obtain PAGE_OFFSET value */
77 afs_linux_page_offset = get_page_offset();
79 #ifndef AFS_S390_LINUX22_ENV
80 if (afs_linux_page_offset == 0) {
81 /* couldn't obtain page offset so can't continue */
82 printf("afs: Unable to obtain PAGE_OFFSET. Exiting..");
85 #endif /* AFS_S390_LINUX22_ENV */
86 #endif /* !defined(AFS_LINUX24_ENV) */
90 err = osi_syscall_init();
93 err = afs_init_inodecache();
96 register_filesystem(&afs_fs_type);
98 #ifdef AFS_LINUX24_ENV
105 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
115 unregister_filesystem(&afs_fs_type);
117 afs_destroy_inodecache();
118 osi_linux_free_afs_memory();
120 #ifdef AFS_LINUX24_ENV
126 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
127 MODULE_LICENSE("http://www.openafs.org/dl/license10.html");
128 module_init(afs_init);
129 module_exit(afs_cleanup);
133 #if !defined(AFS_LINUX24_ENV)
135 get_page_offset(void)
137 #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)
140 struct task_struct *p, *q;
142 /* search backward thru the circular list */
143 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
144 read_lock(&tasklist_lock);
146 /* search backward thru the circular list */
147 #ifdef DEFINED_PREV_TASK
148 for (q = current; p = q; q = prev_task(p)) {
150 for (p = current; p; p = p->prev_task) {
153 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
154 read_unlock(&tasklist_lock);
156 return p->addr_limit.seg;
160 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
161 read_unlock(&tasklist_lock);
166 #endif /* !AFS_LINUX24_ENV */