2 * Copyright (C) 1996, 1997 Claus-Justus Heine.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; see the file COPYING. If not, write to
16 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
19 * This file contains the code that registers the zftape frontend
20 * to the ftape floppy tape driver for Linux
23 #include <linux/module.h>
24 #include <linux/errno.h>
26 #include <linux/kernel.h>
27 #include <linux/signal.h>
28 #include <linux/major.h>
29 #include <linux/slab.h>
31 #include <linux/kmod.h>
33 #include <linux/fcntl.h>
34 #include <linux/smp_lock.h>
36 #include <linux/zftape.h>
37 #include <linux/init.h>
38 #include <linux/device.h>
40 #include "../zftape/zftape-init.h"
41 #include "../zftape/zftape-read.h"
42 #include "../zftape/zftape-write.h"
43 #include "../zftape/zftape-ctl.h"
44 #include "../zftape/zftape-buffers.h"
46 MODULE_AUTHOR("(c) 1996, 1997 Claus-Justus Heine "
47 "(claus@momo.math.rwth-aachen.de)");
48 MODULE_DESCRIPTION(ZFTAPE_VERSION " - "
49 "VFS interface for the Linux floppy tape driver. "
50 "Support for QIC-113 compatible volume table "
51 "and builtin compression (lzrw3 algorithm)");
52 MODULE_SUPPORTED_DEVICE("char-major-27");
53 MODULE_LICENSE("GPL");
57 struct zft_cmpr_ops *zft_cmpr_ops = NULL;
58 const ftape_info *zft_status;
62 static unsigned long busy_flag;
64 static sigset_t orig_sigmask;
66 /* the interface to the kernel vfs layer
69 /* Note about llseek():
71 * st.c and tpqic.c update fp->f_pos but don't implment llseek() and
72 * initialize the llseek component of the file_ops struct with NULL.
73 * This means that the user will get the default seek, but the tape
74 * device will not respect the new position, but happily read from the
75 * old position. Think a zftape specific llseek() function would be
76 * better, returning -ESPIPE. TODO.
79 static int zft_open (struct inode *ino, struct file *filep);
80 static int zft_close(struct inode *ino, struct file *filep);
81 static int zft_ioctl(struct inode *ino, struct file *filep,
82 unsigned int command, unsigned long arg);
83 static int zft_mmap(struct file *filep, struct vm_area_struct *vma);
84 static ssize_t zft_read (struct file *fp, char __user *buff,
85 size_t req_len, loff_t *ppos);
86 static ssize_t zft_write(struct file *fp, const char __user *buff,
87 size_t req_len, loff_t *ppos);
89 static const struct file_operations zft_cdev =
100 static struct class *zft_class;
102 /* Open floppy tape device
104 static int zft_open(struct inode *ino, struct file *filep)
107 TRACE_FUN(ft_t_flow);
109 nonseekable_open(ino, filep);
110 TRACE(ft_t_flow, "called for minor %d", iminor(ino));
111 if ( test_and_set_bit(0,&busy_flag) ) {
112 TRACE_ABORT(-EBUSY, ft_t_warn, "failed: already busy");
114 if ((iminor(ino) & ~(ZFT_MINOR_OP_MASK | FTAPE_NO_REWIND))
117 clear_bit(0,&busy_flag);
118 TRACE_ABORT(-ENXIO, ft_t_err, "failed: invalid unit nr");
120 orig_sigmask = current->blocked;
121 sigfillset(¤t->blocked);
122 result = _zft_open(iminor(ino), filep->f_flags & O_ACCMODE);
124 current->blocked = orig_sigmask; /* restore mask */
125 clear_bit(0,&busy_flag);
126 TRACE_ABORT(result, ft_t_err, "_ftape_open failed");
128 /* Mask signals that will disturb proper operation of the
129 * program that is calling.
131 current->blocked = orig_sigmask;
132 sigaddsetmask (¤t->blocked, _DO_BLOCK);
137 /* Close floppy tape device
139 static int zft_close(struct inode *ino, struct file *filep)
142 TRACE_FUN(ft_t_flow);
144 if ( !test_bit(0,&busy_flag) || iminor(ino) != zft_unit) {
145 TRACE(ft_t_err, "failed: not busy or wrong unit");
148 sigfillset(¤t->blocked);
149 result = _zft_close();
151 TRACE(ft_t_err, "_zft_close failed");
153 current->blocked = orig_sigmask; /* restore before open state */
154 clear_bit(0,&busy_flag);
158 /* Ioctl for floppy tape device
160 static int zft_ioctl(struct inode *ino, struct file *filep,
161 unsigned int command, unsigned long arg)
164 sigset_t old_sigmask;
165 TRACE_FUN(ft_t_flow);
167 if ( !test_bit(0,&busy_flag) || iminor(ino) != zft_unit || ft_failure) {
168 TRACE_ABORT(-EIO, ft_t_err,
169 "failed: not busy, failure or wrong unit");
171 old_sigmask = current->blocked; /* save mask */
172 sigfillset(¤t->blocked);
173 /* This will work as long as sizeof(void *) == sizeof(long) */
174 result = _zft_ioctl(command, (void __user *) arg);
175 current->blocked = old_sigmask; /* restore mask */
179 /* Ioctl for floppy tape device
181 static int zft_mmap(struct file *filep, struct vm_area_struct *vma)
184 sigset_t old_sigmask;
185 TRACE_FUN(ft_t_flow);
187 if ( !test_bit(0,&busy_flag) ||
188 iminor(filep->f_dentry->d_inode) != zft_unit ||
191 TRACE_ABORT(-EIO, ft_t_err,
192 "failed: not busy, failure or wrong unit");
194 old_sigmask = current->blocked; /* save mask */
195 sigfillset(¤t->blocked);
196 if ((result = ftape_mmap(vma)) >= 0) {
197 #ifndef MSYNC_BUG_WAS_FIXED
198 static struct vm_operations_struct dummy = { NULL, };
199 vma->vm_ops = &dummy;
202 current->blocked = old_sigmask; /* restore mask */
206 /* Read from floppy tape device
208 static ssize_t zft_read(struct file *fp, char __user *buff,
209 size_t req_len, loff_t *ppos)
212 sigset_t old_sigmask;
213 struct inode *ino = fp->f_dentry->d_inode;
214 TRACE_FUN(ft_t_flow);
216 TRACE(ft_t_data_flow, "called with count: %ld", (unsigned long)req_len);
217 if (!test_bit(0,&busy_flag) || iminor(ino) != zft_unit || ft_failure) {
218 TRACE_ABORT(-EIO, ft_t_err,
219 "failed: not busy, failure or wrong unit");
221 old_sigmask = current->blocked; /* save mask */
222 sigfillset(¤t->blocked);
223 result = _zft_read(buff, req_len);
224 current->blocked = old_sigmask; /* restore mask */
225 TRACE(ft_t_data_flow, "return with count: %d", result);
229 /* Write to tape device
231 static ssize_t zft_write(struct file *fp, const char __user *buff,
232 size_t req_len, loff_t *ppos)
235 sigset_t old_sigmask;
236 struct inode *ino = fp->f_dentry->d_inode;
237 TRACE_FUN(ft_t_flow);
239 TRACE(ft_t_flow, "called with count: %ld", (unsigned long)req_len);
240 if (!test_bit(0,&busy_flag) || iminor(ino) != zft_unit || ft_failure) {
241 TRACE_ABORT(-EIO, ft_t_err,
242 "failed: not busy, failure or wrong unit");
244 old_sigmask = current->blocked; /* save mask */
245 sigfillset(¤t->blocked);
246 result = _zft_write(buff, req_len);
247 current->blocked = old_sigmask; /* restore mask */
248 TRACE(ft_t_data_flow, "return with count: %d", result);
252 /* END OF VFS INTERFACE
254 *****************************************************************************/
256 /* driver/module initialization
259 /* the compression module has to call this function to hook into the zftape
262 int zft_cmpr_register(struct zft_cmpr_ops *new_ops)
264 TRACE_FUN(ft_t_flow);
266 if (zft_cmpr_ops != NULL) {
269 zft_cmpr_ops = new_ops;
274 /* lock the zft-compressor() module.
276 int zft_cmpr_lock(int try_to_load)
278 if (zft_cmpr_ops == NULL) {
281 request_module("zft-compressor");
282 if (zft_cmpr_ops == NULL) {
292 (*zft_cmpr_ops->lock)();
296 #ifdef CONFIG_ZFT_COMPRESSOR
297 extern int zft_compressor_init(void);
300 /* Called by modules package when installing the driver or by kernel
301 * during the initialization phase
303 int __init zft_init(void)
306 TRACE_FUN(ft_t_flow);
309 printk(KERN_INFO ZFTAPE_VERSION "\n");
310 if (TRACE_LEVEL >= ft_t_info) {
313 "(c) 1996, 1997 Claus-Justus Heine (claus@momo.math.rwth-aachen.de)\n"
315 "vfs interface for ftape floppy tape driver.\n"
317 "Support for QIC-113 compatible volume table, dynamic memory allocation\n"
319 "and builtin compression (lzrw3 algorithm).\n");
322 /* print a short no-nonsense boot message */
323 printk(KERN_INFO ZFTAPE_VERSION "\n");
325 TRACE(ft_t_info, "zft_init @ 0x%p", zft_init);
327 "installing zftape VFS interface for ftape driver ...");
328 TRACE_CATCH(register_chrdev(QIC117_TAPE_MAJOR, "zft", &zft_cdev),);
330 zft_class = class_create(THIS_MODULE, "zft");
331 for (i = 0; i < 4; i++) {
332 class_device_create(zft_class, NULL, MKDEV(QIC117_TAPE_MAJOR, i), NULL, "qft%i", i);
333 class_device_create(zft_class, NULL, MKDEV(QIC117_TAPE_MAJOR, i + 4), NULL, "nqft%i", i);
334 class_device_create(zft_class, NULL, MKDEV(QIC117_TAPE_MAJOR, i + 16), NULL, "zqft%i", i);
335 class_device_create(zft_class, NULL, MKDEV(QIC117_TAPE_MAJOR, i + 20), NULL, "nzqft%i", i);
336 class_device_create(zft_class, NULL, MKDEV(QIC117_TAPE_MAJOR, i + 32), NULL, "rawqft%i", i);
337 class_device_create(zft_class, NULL, MKDEV(QIC117_TAPE_MAJOR, i + 36), NULL, "nrawrawqft%i", i);
340 #ifdef CONFIG_ZFT_COMPRESSOR
341 (void)zft_compressor_init();
343 zft_status = ftape_get_status(); /* fetch global data of ftape
350 /* Called by modules package when removing the driver
352 static void zft_exit(void)
355 TRACE_FUN(ft_t_flow);
357 if (unregister_chrdev(QIC117_TAPE_MAJOR, "zft") != 0) {
358 TRACE(ft_t_warn, "failed");
360 TRACE(ft_t_info, "successful");
362 for (i = 0; i < 4; i++) {
363 class_device_destroy(zft_class, MKDEV(QIC117_TAPE_MAJOR, i));
364 class_device_destroy(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 4));
365 class_device_destroy(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 16));
366 class_device_destroy(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 20));
367 class_device_destroy(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 32));
368 class_device_destroy(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 36));
370 class_destroy(zft_class);
371 zft_uninit_mem(); /* release remaining memory, if any */
372 printk(KERN_INFO "zftape successfully unloaded.\n");
376 module_init(zft_init);
377 module_exit(zft_exit);