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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 1996, 1997 Claus-Justus Heine. | |
3 | ||
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) | |
7 | any later version. | |
8 | ||
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. | |
13 | ||
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. | |
17 | ||
18 | * | |
19 | * This file contains the code that registers the zftape frontend | |
20 | * to the ftape floppy tape driver for Linux | |
21 | */ | |
22 | ||
23 | #include <linux/config.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/fs.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/signal.h> | |
29 | #include <linux/major.h> | |
30 | #include <linux/slab.h> | |
31 | #ifdef CONFIG_KMOD | |
32 | #include <linux/kmod.h> | |
33 | #endif | |
34 | #include <linux/fcntl.h> | |
35 | #include <linux/smp_lock.h> | |
36 | #include <linux/devfs_fs_kernel.h> | |
37 | ||
38 | #include <linux/zftape.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/device.h> | |
41 | ||
42 | #include "../zftape/zftape-init.h" | |
43 | #include "../zftape/zftape-read.h" | |
44 | #include "../zftape/zftape-write.h" | |
45 | #include "../zftape/zftape-ctl.h" | |
46 | #include "../zftape/zftape-buffers.h" | |
47 | ||
48 | MODULE_AUTHOR("(c) 1996, 1997 Claus-Justus Heine " | |
49 | "(claus@momo.math.rwth-aachen.de)"); | |
50 | MODULE_DESCRIPTION(ZFTAPE_VERSION " - " | |
51 | "VFS interface for the Linux floppy tape driver. " | |
52 | "Support for QIC-113 compatible volume table " | |
53 | "and builtin compression (lzrw3 algorithm)"); | |
54 | MODULE_SUPPORTED_DEVICE("char-major-27"); | |
55 | MODULE_LICENSE("GPL"); | |
56 | ||
57 | /* Global vars. | |
58 | */ | |
59 | struct zft_cmpr_ops *zft_cmpr_ops = NULL; | |
60 | const ftape_info *zft_status; | |
61 | ||
62 | /* Local vars. | |
63 | */ | |
64 | static unsigned long busy_flag; | |
65 | ||
66 | static sigset_t orig_sigmask; | |
67 | ||
68 | /* the interface to the kernel vfs layer | |
69 | */ | |
70 | ||
71 | /* Note about llseek(): | |
72 | * | |
73 | * st.c and tpqic.c update fp->f_pos but don't implment llseek() and | |
74 | * initialize the llseek component of the file_ops struct with NULL. | |
75 | * This means that the user will get the default seek, but the tape | |
76 | * device will not respect the new position, but happily read from the | |
77 | * old position. Think a zftape specific llseek() function would be | |
78 | * better, returning -ESPIPE. TODO. | |
79 | */ | |
80 | ||
81 | static int zft_open (struct inode *ino, struct file *filep); | |
82 | static int zft_close(struct inode *ino, struct file *filep); | |
83 | static int zft_ioctl(struct inode *ino, struct file *filep, | |
84 | unsigned int command, unsigned long arg); | |
85 | static int zft_mmap(struct file *filep, struct vm_area_struct *vma); | |
86 | static ssize_t zft_read (struct file *fp, char __user *buff, | |
87 | size_t req_len, loff_t *ppos); | |
88 | static ssize_t zft_write(struct file *fp, const char __user *buff, | |
89 | size_t req_len, loff_t *ppos); | |
90 | ||
91 | static struct file_operations zft_cdev = | |
92 | { | |
93 | .owner = THIS_MODULE, | |
94 | .read = zft_read, | |
95 | .write = zft_write, | |
96 | .ioctl = zft_ioctl, | |
97 | .mmap = zft_mmap, | |
98 | .open = zft_open, | |
99 | .release = zft_close, | |
100 | }; | |
101 | ||
ca8eca68 | 102 | static struct class *zft_class; |
1da177e4 LT |
103 | |
104 | /* Open floppy tape device | |
105 | */ | |
106 | static int zft_open(struct inode *ino, struct file *filep) | |
107 | { | |
108 | int result; | |
109 | TRACE_FUN(ft_t_flow); | |
110 | ||
111 | nonseekable_open(ino, filep); | |
112 | TRACE(ft_t_flow, "called for minor %d", iminor(ino)); | |
113 | if ( test_and_set_bit(0,&busy_flag) ) { | |
114 | TRACE_ABORT(-EBUSY, ft_t_warn, "failed: already busy"); | |
115 | } | |
116 | if ((iminor(ino) & ~(ZFT_MINOR_OP_MASK | FTAPE_NO_REWIND)) | |
117 | > | |
118 | FTAPE_SEL_D) { | |
119 | clear_bit(0,&busy_flag); | |
120 | TRACE_ABORT(-ENXIO, ft_t_err, "failed: invalid unit nr"); | |
121 | } | |
122 | orig_sigmask = current->blocked; | |
123 | sigfillset(¤t->blocked); | |
124 | result = _zft_open(iminor(ino), filep->f_flags & O_ACCMODE); | |
125 | if (result < 0) { | |
126 | current->blocked = orig_sigmask; /* restore mask */ | |
127 | clear_bit(0,&busy_flag); | |
128 | TRACE_ABORT(result, ft_t_err, "_ftape_open failed"); | |
129 | } else { | |
130 | /* Mask signals that will disturb proper operation of the | |
131 | * program that is calling. | |
132 | */ | |
133 | current->blocked = orig_sigmask; | |
134 | sigaddsetmask (¤t->blocked, _DO_BLOCK); | |
135 | TRACE_EXIT 0; | |
136 | } | |
137 | } | |
138 | ||
139 | /* Close floppy tape device | |
140 | */ | |
141 | static int zft_close(struct inode *ino, struct file *filep) | |
142 | { | |
143 | int result; | |
144 | TRACE_FUN(ft_t_flow); | |
145 | ||
146 | if ( !test_bit(0,&busy_flag) || iminor(ino) != zft_unit) { | |
147 | TRACE(ft_t_err, "failed: not busy or wrong unit"); | |
148 | TRACE_EXIT 0; | |
149 | } | |
150 | sigfillset(¤t->blocked); | |
151 | result = _zft_close(); | |
152 | if (result < 0) { | |
153 | TRACE(ft_t_err, "_zft_close failed"); | |
154 | } | |
155 | current->blocked = orig_sigmask; /* restore before open state */ | |
156 | clear_bit(0,&busy_flag); | |
157 | TRACE_EXIT 0; | |
158 | } | |
159 | ||
160 | /* Ioctl for floppy tape device | |
161 | */ | |
162 | static int zft_ioctl(struct inode *ino, struct file *filep, | |
163 | unsigned int command, unsigned long arg) | |
164 | { | |
165 | int result = -EIO; | |
166 | sigset_t old_sigmask; | |
167 | TRACE_FUN(ft_t_flow); | |
168 | ||
169 | if ( !test_bit(0,&busy_flag) || iminor(ino) != zft_unit || ft_failure) { | |
170 | TRACE_ABORT(-EIO, ft_t_err, | |
171 | "failed: not busy, failure or wrong unit"); | |
172 | } | |
173 | old_sigmask = current->blocked; /* save mask */ | |
174 | sigfillset(¤t->blocked); | |
175 | /* This will work as long as sizeof(void *) == sizeof(long) */ | |
176 | result = _zft_ioctl(command, (void __user *) arg); | |
177 | current->blocked = old_sigmask; /* restore mask */ | |
178 | TRACE_EXIT result; | |
179 | } | |
180 | ||
181 | /* Ioctl for floppy tape device | |
182 | */ | |
183 | static int zft_mmap(struct file *filep, struct vm_area_struct *vma) | |
184 | { | |
185 | int result = -EIO; | |
186 | sigset_t old_sigmask; | |
187 | TRACE_FUN(ft_t_flow); | |
188 | ||
189 | if ( !test_bit(0,&busy_flag) || | |
190 | iminor(filep->f_dentry->d_inode) != zft_unit || | |
191 | ft_failure) | |
192 | { | |
193 | TRACE_ABORT(-EIO, ft_t_err, | |
194 | "failed: not busy, failure or wrong unit"); | |
195 | } | |
196 | old_sigmask = current->blocked; /* save mask */ | |
197 | sigfillset(¤t->blocked); | |
198 | if ((result = ftape_mmap(vma)) >= 0) { | |
199 | #ifndef MSYNC_BUG_WAS_FIXED | |
200 | static struct vm_operations_struct dummy = { NULL, }; | |
201 | vma->vm_ops = &dummy; | |
202 | #endif | |
203 | } | |
204 | current->blocked = old_sigmask; /* restore mask */ | |
205 | TRACE_EXIT result; | |
206 | } | |
207 | ||
208 | /* Read from floppy tape device | |
209 | */ | |
210 | static ssize_t zft_read(struct file *fp, char __user *buff, | |
211 | size_t req_len, loff_t *ppos) | |
212 | { | |
213 | int result = -EIO; | |
214 | sigset_t old_sigmask; | |
215 | struct inode *ino = fp->f_dentry->d_inode; | |
216 | TRACE_FUN(ft_t_flow); | |
217 | ||
218 | TRACE(ft_t_data_flow, "called with count: %ld", (unsigned long)req_len); | |
219 | if (!test_bit(0,&busy_flag) || iminor(ino) != zft_unit || ft_failure) { | |
220 | TRACE_ABORT(-EIO, ft_t_err, | |
221 | "failed: not busy, failure or wrong unit"); | |
222 | } | |
223 | old_sigmask = current->blocked; /* save mask */ | |
224 | sigfillset(¤t->blocked); | |
225 | result = _zft_read(buff, req_len); | |
226 | current->blocked = old_sigmask; /* restore mask */ | |
227 | TRACE(ft_t_data_flow, "return with count: %d", result); | |
228 | TRACE_EXIT result; | |
229 | } | |
230 | ||
231 | /* Write to tape device | |
232 | */ | |
233 | static ssize_t zft_write(struct file *fp, const char __user *buff, | |
234 | size_t req_len, loff_t *ppos) | |
235 | { | |
236 | int result = -EIO; | |
237 | sigset_t old_sigmask; | |
238 | struct inode *ino = fp->f_dentry->d_inode; | |
239 | TRACE_FUN(ft_t_flow); | |
240 | ||
241 | TRACE(ft_t_flow, "called with count: %ld", (unsigned long)req_len); | |
242 | if (!test_bit(0,&busy_flag) || iminor(ino) != zft_unit || ft_failure) { | |
243 | TRACE_ABORT(-EIO, ft_t_err, | |
244 | "failed: not busy, failure or wrong unit"); | |
245 | } | |
246 | old_sigmask = current->blocked; /* save mask */ | |
247 | sigfillset(¤t->blocked); | |
248 | result = _zft_write(buff, req_len); | |
249 | current->blocked = old_sigmask; /* restore mask */ | |
250 | TRACE(ft_t_data_flow, "return with count: %d", result); | |
251 | TRACE_EXIT result; | |
252 | } | |
253 | ||
254 | /* END OF VFS INTERFACE | |
255 | * | |
256 | *****************************************************************************/ | |
257 | ||
258 | /* driver/module initialization | |
259 | */ | |
260 | ||
261 | /* the compression module has to call this function to hook into the zftape | |
262 | * code | |
263 | */ | |
264 | int zft_cmpr_register(struct zft_cmpr_ops *new_ops) | |
265 | { | |
266 | TRACE_FUN(ft_t_flow); | |
267 | ||
268 | if (zft_cmpr_ops != NULL) { | |
269 | TRACE_EXIT -EBUSY; | |
270 | } else { | |
271 | zft_cmpr_ops = new_ops; | |
272 | TRACE_EXIT 0; | |
273 | } | |
274 | } | |
275 | ||
276 | /* lock the zft-compressor() module. | |
277 | */ | |
278 | int zft_cmpr_lock(int try_to_load) | |
279 | { | |
280 | if (zft_cmpr_ops == NULL) { | |
281 | #ifdef CONFIG_KMOD | |
282 | if (try_to_load) { | |
283 | request_module("zft-compressor"); | |
284 | if (zft_cmpr_ops == NULL) { | |
285 | return -ENOSYS; | |
286 | } | |
287 | } else { | |
288 | return -ENOSYS; | |
289 | } | |
290 | #else | |
291 | return -ENOSYS; | |
292 | #endif | |
293 | } | |
294 | (*zft_cmpr_ops->lock)(); | |
295 | return 0; | |
296 | } | |
297 | ||
298 | #ifdef CONFIG_ZFT_COMPRESSOR | |
299 | extern int zft_compressor_init(void); | |
300 | #endif | |
301 | ||
302 | /* Called by modules package when installing the driver or by kernel | |
303 | * during the initialization phase | |
304 | */ | |
305 | int __init zft_init(void) | |
306 | { | |
307 | int i; | |
308 | TRACE_FUN(ft_t_flow); | |
309 | ||
310 | #ifdef MODULE | |
311 | printk(KERN_INFO ZFTAPE_VERSION "\n"); | |
312 | if (TRACE_LEVEL >= ft_t_info) { | |
313 | printk( | |
314 | KERN_INFO | |
315 | "(c) 1996, 1997 Claus-Justus Heine (claus@momo.math.rwth-aachen.de)\n" | |
316 | KERN_INFO | |
317 | "vfs interface for ftape floppy tape driver.\n" | |
318 | KERN_INFO | |
319 | "Support for QIC-113 compatible volume table, dynamic memory allocation\n" | |
320 | KERN_INFO | |
321 | "and builtin compression (lzrw3 algorithm).\n"); | |
322 | } | |
323 | #else /* !MODULE */ | |
324 | /* print a short no-nonsense boot message */ | |
325 | printk(KERN_INFO ZFTAPE_VERSION "\n"); | |
326 | #endif /* MODULE */ | |
327 | TRACE(ft_t_info, "zft_init @ 0x%p", zft_init); | |
328 | TRACE(ft_t_info, | |
329 | "installing zftape VFS interface for ftape driver ..."); | |
330 | TRACE_CATCH(register_chrdev(QIC117_TAPE_MAJOR, "zft", &zft_cdev),); | |
331 | ||
ca8eca68 | 332 | zft_class = class_create(THIS_MODULE, "zft"); |
1da177e4 | 333 | for (i = 0; i < 4; i++) { |
ca8eca68 | 334 | class_device_create(zft_class, MKDEV(QIC117_TAPE_MAJOR, i), NULL, "qft%i", i); |
1da177e4 LT |
335 | devfs_mk_cdev(MKDEV(QIC117_TAPE_MAJOR, i), |
336 | S_IFCHR | S_IRUSR | S_IWUSR, | |
337 | "qft%i", i); | |
ca8eca68 | 338 | class_device_create(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 4), NULL, "nqft%i", i); |
1da177e4 LT |
339 | devfs_mk_cdev(MKDEV(QIC117_TAPE_MAJOR, i + 4), |
340 | S_IFCHR | S_IRUSR | S_IWUSR, | |
341 | "nqft%i", i); | |
ca8eca68 | 342 | class_device_create(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 16), NULL, "zqft%i", i); |
1da177e4 LT |
343 | devfs_mk_cdev(MKDEV(QIC117_TAPE_MAJOR, i + 16), |
344 | S_IFCHR | S_IRUSR | S_IWUSR, | |
345 | "zqft%i", i); | |
ca8eca68 | 346 | class_device_create(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 20), NULL, "nzqft%i", i); |
1da177e4 LT |
347 | devfs_mk_cdev(MKDEV(QIC117_TAPE_MAJOR, i + 20), |
348 | S_IFCHR | S_IRUSR | S_IWUSR, | |
349 | "nzqft%i", i); | |
ca8eca68 | 350 | class_device_create(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 32), NULL, "rawqft%i", i); |
1da177e4 LT |
351 | devfs_mk_cdev(MKDEV(QIC117_TAPE_MAJOR, i + 32), |
352 | S_IFCHR | S_IRUSR | S_IWUSR, | |
353 | "rawqft%i", i); | |
ca8eca68 | 354 | class_device_create(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 36), NULL, "nrawrawqft%i", i); |
1da177e4 LT |
355 | devfs_mk_cdev(MKDEV(QIC117_TAPE_MAJOR, i + 36), |
356 | S_IFCHR | S_IRUSR | S_IWUSR, | |
357 | "nrawqft%i", i); | |
358 | } | |
359 | ||
360 | #ifdef CONFIG_ZFT_COMPRESSOR | |
361 | (void)zft_compressor_init(); | |
362 | #endif | |
363 | zft_status = ftape_get_status(); /* fetch global data of ftape | |
364 | * hardware driver | |
365 | */ | |
366 | TRACE_EXIT 0; | |
367 | } | |
368 | ||
369 | ||
370 | /* Called by modules package when removing the driver | |
371 | */ | |
372 | static void zft_exit(void) | |
373 | { | |
374 | int i; | |
375 | TRACE_FUN(ft_t_flow); | |
376 | ||
377 | if (unregister_chrdev(QIC117_TAPE_MAJOR, "zft") != 0) { | |
378 | TRACE(ft_t_warn, "failed"); | |
379 | } else { | |
380 | TRACE(ft_t_info, "successful"); | |
381 | } | |
382 | for (i = 0; i < 4; i++) { | |
383 | devfs_remove("qft%i", i); | |
ca8eca68 | 384 | class_device_destroy(zft_class, MKDEV(QIC117_TAPE_MAJOR, i)); |
1da177e4 | 385 | devfs_remove("nqft%i", i); |
ca8eca68 | 386 | class_device_destroy(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 4)); |
1da177e4 | 387 | devfs_remove("zqft%i", i); |
ca8eca68 | 388 | class_device_destroy(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 16)); |
1da177e4 | 389 | devfs_remove("nzqft%i", i); |
ca8eca68 | 390 | class_device_destroy(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 20)); |
1da177e4 | 391 | devfs_remove("rawqft%i", i); |
ca8eca68 | 392 | class_device_destroy(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 32)); |
1da177e4 | 393 | devfs_remove("nrawqft%i", i); |
ca8eca68 | 394 | class_device_destroy(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 36)); |
1da177e4 | 395 | } |
ca8eca68 | 396 | class_destroy(zft_class); |
1da177e4 LT |
397 | zft_uninit_mem(); /* release remaining memory, if any */ |
398 | printk(KERN_INFO "zftape successfully unloaded.\n"); | |
399 | TRACE_EXIT; | |
400 | } | |
401 | ||
402 | module_init(zft_init); | |
403 | module_exit(zft_exit); |