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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying | |
3 | file Documentation/scsi/st.txt for more information. | |
4 | ||
5 | History: | |
6 | Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara. | |
7 | Contribution and ideas from several people including (in alphabetical | |
8 | order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk, | |
9 | Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky, | |
10 | Michael Schaefer, J"org Weule, and Eric Youngdale. | |
11 | ||
12 | Copyright 1992 - 2005 Kai Makisara | |
13 | email Kai.Makisara@kolumbus.fi | |
14 | ||
15 | Some small formal changes - aeb, 950809 | |
16 | ||
17 | Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support | |
18 | */ | |
19 | ||
0ad78200 | 20 | static const char *verstr = "20050830"; |
1da177e4 LT |
21 | |
22 | #include <linux/module.h> | |
23 | ||
24 | #include <linux/fs.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/sched.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/mtio.h> | |
16c4b3e2 | 32 | #include <linux/cdrom.h> |
1da177e4 LT |
33 | #include <linux/ioctl.h> |
34 | #include <linux/fcntl.h> | |
35 | #include <linux/spinlock.h> | |
36 | #include <linux/blkdev.h> | |
37 | #include <linux/moduleparam.h> | |
38 | #include <linux/devfs_fs_kernel.h> | |
39 | #include <linux/cdev.h> | |
40 | #include <linux/delay.h> | |
41 | ||
42 | #include <asm/uaccess.h> | |
43 | #include <asm/dma.h> | |
44 | #include <asm/system.h> | |
45 | ||
46 | #include <scsi/scsi.h> | |
47 | #include <scsi/scsi_dbg.h> | |
48 | #include <scsi/scsi_device.h> | |
49 | #include <scsi/scsi_driver.h> | |
50 | #include <scsi/scsi_eh.h> | |
51 | #include <scsi/scsi_host.h> | |
52 | #include <scsi/scsi_ioctl.h> | |
53 | #include <scsi/scsi_request.h> | |
16c4b3e2 | 54 | #include <scsi/sg.h> |
1da177e4 LT |
55 | |
56 | ||
57 | /* The driver prints some debugging information on the console if DEBUG | |
58 | is defined and non-zero. */ | |
59 | #define DEBUG 0 | |
60 | ||
61 | #if DEBUG | |
62 | /* The message level for the debug messages is currently set to KERN_NOTICE | |
63 | so that people can easily see the messages. Later when the debugging messages | |
64 | in the drivers are more widely classified, this may be changed to KERN_DEBUG. */ | |
65 | #define ST_DEB_MSG KERN_NOTICE | |
66 | #define DEB(a) a | |
67 | #define DEBC(a) if (debugging) { a ; } | |
68 | #else | |
69 | #define DEB(a) | |
70 | #define DEBC(a) | |
71 | #endif | |
72 | ||
73 | #define ST_KILOBYTE 1024 | |
74 | ||
75 | #include "st_options.h" | |
76 | #include "st.h" | |
77 | ||
78 | static int buffer_kbs; | |
79 | static int max_sg_segs; | |
80 | static int try_direct_io = TRY_DIRECT_IO; | |
81 | static int try_rdio = 1; | |
82 | static int try_wdio = 1; | |
83 | ||
84 | static int st_dev_max; | |
85 | static int st_nr_dev; | |
86 | ||
d253878b | 87 | static struct class *st_sysfs_class; |
1da177e4 LT |
88 | |
89 | MODULE_AUTHOR("Kai Makisara"); | |
90 | MODULE_DESCRIPTION("SCSI Tape Driver"); | |
91 | MODULE_LICENSE("GPL"); | |
92 | ||
93 | /* Set 'perm' (4th argument) to 0 to disable module_param's definition | |
94 | * of sysfs parameters (which module_param doesn't yet support). | |
95 | * Sysfs parameters defined explicitly later. | |
96 | */ | |
97 | module_param_named(buffer_kbs, buffer_kbs, int, 0); | |
98 | MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)"); | |
99 | module_param_named(max_sg_segs, max_sg_segs, int, 0); | |
100 | MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)"); | |
101 | module_param_named(try_direct_io, try_direct_io, int, 0); | |
102 | MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)"); | |
103 | ||
104 | /* Extra parameters for testing */ | |
105 | module_param_named(try_rdio, try_rdio, int, 0); | |
106 | MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); | |
107 | module_param_named(try_wdio, try_wdio, int, 0); | |
108 | MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); | |
109 | ||
110 | #ifndef MODULE | |
111 | static int write_threshold_kbs; /* retained for compatibility */ | |
112 | static struct st_dev_parm { | |
113 | char *name; | |
114 | int *val; | |
115 | } parms[] __initdata = { | |
116 | { | |
117 | "buffer_kbs", &buffer_kbs | |
118 | }, | |
119 | { /* Retained for compatibility with 2.4 */ | |
120 | "write_threshold_kbs", &write_threshold_kbs | |
121 | }, | |
122 | { | |
123 | "max_sg_segs", NULL | |
124 | }, | |
125 | { | |
126 | "try_direct_io", &try_direct_io | |
127 | } | |
128 | }; | |
129 | #endif | |
130 | ||
131 | /* Restrict the number of modes so that names for all are assigned */ | |
132 | #if ST_NBR_MODES > 16 | |
133 | #error "Maximum number of modes is 16" | |
134 | #endif | |
135 | /* Bit reversed order to get same names for same minors with all | |
136 | mode counts */ | |
0ad78200 | 137 | static const char *st_formats[] = { |
1da177e4 LT |
138 | "", "r", "k", "s", "l", "t", "o", "u", |
139 | "m", "v", "p", "x", "a", "y", "q", "z"}; | |
140 | ||
141 | /* The default definitions have been moved to st_options.h */ | |
142 | ||
143 | #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) | |
144 | ||
145 | /* The buffer size should fit into the 24 bits for length in the | |
146 | 6-byte SCSI read and write commands. */ | |
147 | #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) | |
148 | #error "Buffer size should not exceed (2 << 24 - 1) bytes!" | |
149 | #endif | |
150 | ||
151 | static int debugging = DEBUG; | |
152 | ||
153 | #define MAX_RETRIES 0 | |
154 | #define MAX_WRITE_RETRIES 0 | |
155 | #define MAX_READY_RETRIES 0 | |
156 | #define NO_TAPE NOT_READY | |
157 | ||
158 | #define ST_TIMEOUT (900 * HZ) | |
159 | #define ST_LONG_TIMEOUT (14000 * HZ) | |
160 | ||
161 | /* Remove mode bits and auto-rewind bit (7) */ | |
162 | #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ | |
163 | (iminor(x) & ~(-1 << ST_MODE_SHIFT)) ) | |
164 | #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) | |
165 | ||
166 | /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ | |
167 | #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ | |
168 | (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) | |
169 | ||
170 | /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower | |
171 | 24 bits) */ | |
172 | #define SET_DENS_AND_BLK 0x10001 | |
173 | ||
174 | static DEFINE_RWLOCK(st_dev_arr_lock); | |
175 | ||
176 | static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; | |
177 | static int st_max_sg_segs = ST_MAX_SG; | |
178 | ||
179 | static struct scsi_tape **scsi_tapes = NULL; | |
180 | ||
181 | static int modes_defined; | |
182 | ||
183 | static struct st_buffer *new_tape_buffer(int, int, int); | |
184 | static int enlarge_buffer(struct st_buffer *, int, int); | |
185 | static void normalize_buffer(struct st_buffer *); | |
186 | static int append_to_buffer(const char __user *, struct st_buffer *, int); | |
187 | static int from_buffer(struct st_buffer *, char __user *, int); | |
188 | static void move_buffer_data(struct st_buffer *, int); | |
189 | static void buf_to_sg(struct st_buffer *, unsigned int); | |
190 | ||
191 | static int st_map_user_pages(struct scatterlist *, const unsigned int, | |
192 | unsigned long, size_t, int, unsigned long); | |
193 | static int sgl_map_user_pages(struct scatterlist *, const unsigned int, | |
194 | unsigned long, size_t, int); | |
195 | static int sgl_unmap_user_pages(struct scatterlist *, const unsigned int, int); | |
196 | ||
197 | static int st_probe(struct device *); | |
198 | static int st_remove(struct device *); | |
199 | static int st_init_command(struct scsi_cmnd *); | |
200 | ||
201 | static void do_create_driverfs_files(void); | |
202 | static void do_remove_driverfs_files(void); | |
203 | static void do_create_class_files(struct scsi_tape *, int, int); | |
204 | ||
205 | static struct scsi_driver st_template = { | |
206 | .owner = THIS_MODULE, | |
207 | .gendrv = { | |
208 | .name = "st", | |
209 | .probe = st_probe, | |
210 | .remove = st_remove, | |
211 | }, | |
212 | .init_command = st_init_command, | |
213 | }; | |
214 | ||
215 | static int st_compression(struct scsi_tape *, int); | |
216 | ||
217 | static int find_partition(struct scsi_tape *); | |
218 | static int switch_partition(struct scsi_tape *); | |
219 | ||
220 | static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); | |
221 | ||
f03a5670 KM |
222 | static void scsi_tape_release(struct kref *); |
223 | ||
224 | #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref) | |
225 | ||
226 | static DECLARE_MUTEX(st_ref_sem); | |
227 | ||
1da177e4 LT |
228 | \f |
229 | #include "osst_detect.h" | |
230 | #ifndef SIGS_FROM_OSST | |
231 | #define SIGS_FROM_OSST \ | |
232 | {"OnStream", "SC-", "", "osst"}, \ | |
233 | {"OnStream", "DI-", "", "osst"}, \ | |
234 | {"OnStream", "DP-", "", "osst"}, \ | |
235 | {"OnStream", "USB", "", "osst"}, \ | |
236 | {"OnStream", "FW-", "", "osst"} | |
237 | #endif | |
238 | ||
f03a5670 KM |
239 | static struct scsi_tape *scsi_tape_get(int dev) |
240 | { | |
241 | struct scsi_tape *STp = NULL; | |
242 | ||
243 | down(&st_ref_sem); | |
244 | write_lock(&st_dev_arr_lock); | |
245 | ||
246 | if (dev < st_dev_max && scsi_tapes != NULL) | |
247 | STp = scsi_tapes[dev]; | |
248 | if (!STp) goto out; | |
249 | ||
250 | kref_get(&STp->kref); | |
251 | ||
252 | if (!STp->device) | |
253 | goto out_put; | |
254 | ||
255 | if (scsi_device_get(STp->device)) | |
256 | goto out_put; | |
257 | ||
258 | goto out; | |
259 | ||
260 | out_put: | |
261 | kref_put(&STp->kref, scsi_tape_release); | |
262 | STp = NULL; | |
263 | out: | |
264 | write_unlock(&st_dev_arr_lock); | |
265 | up(&st_ref_sem); | |
266 | return STp; | |
267 | } | |
268 | ||
269 | static void scsi_tape_put(struct scsi_tape *STp) | |
270 | { | |
271 | struct scsi_device *sdev = STp->device; | |
272 | ||
273 | down(&st_ref_sem); | |
274 | kref_put(&STp->kref, scsi_tape_release); | |
275 | scsi_device_put(sdev); | |
276 | up(&st_ref_sem); | |
277 | } | |
278 | ||
1da177e4 LT |
279 | struct st_reject_data { |
280 | char *vendor; | |
281 | char *model; | |
282 | char *rev; | |
283 | char *driver_hint; /* Name of the correct driver, NULL if unknown */ | |
284 | }; | |
285 | ||
286 | static struct st_reject_data reject_list[] = { | |
287 | /* {"XXX", "Yy-", "", NULL}, example */ | |
288 | SIGS_FROM_OSST, | |
289 | {NULL, }}; | |
290 | ||
291 | /* If the device signature is on the list of incompatible drives, the | |
292 | function returns a pointer to the name of the correct driver (if known) */ | |
293 | static char * st_incompatible(struct scsi_device* SDp) | |
294 | { | |
295 | struct st_reject_data *rp; | |
296 | ||
297 | for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) | |
298 | if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && | |
299 | !strncmp(rp->model, SDp->model, strlen(rp->model)) && | |
300 | !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { | |
301 | if (rp->driver_hint) | |
302 | return rp->driver_hint; | |
303 | else | |
304 | return "unknown"; | |
305 | } | |
306 | return NULL; | |
307 | } | |
308 | \f | |
309 | ||
310 | static inline char *tape_name(struct scsi_tape *tape) | |
311 | { | |
312 | return tape->disk->disk_name; | |
313 | } | |
314 | ||
315 | ||
316 | static void st_analyze_sense(struct scsi_request *SRpnt, struct st_cmdstatus *s) | |
317 | { | |
318 | const u8 *ucp; | |
319 | const u8 *sense = SRpnt->sr_sense_buffer; | |
320 | ||
321 | s->have_sense = scsi_request_normalize_sense(SRpnt, &s->sense_hdr); | |
322 | s->flags = 0; | |
323 | ||
324 | if (s->have_sense) { | |
325 | s->deferred = 0; | |
326 | s->remainder_valid = | |
327 | scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); | |
328 | switch (sense[0] & 0x7f) { | |
329 | case 0x71: | |
330 | s->deferred = 1; | |
331 | case 0x70: | |
332 | s->fixed_format = 1; | |
333 | s->flags = sense[2] & 0xe0; | |
334 | break; | |
335 | case 0x73: | |
336 | s->deferred = 1; | |
337 | case 0x72: | |
338 | s->fixed_format = 0; | |
339 | ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); | |
340 | s->flags = ucp ? (ucp[3] & 0xe0) : 0; | |
341 | break; | |
342 | } | |
343 | } | |
344 | } | |
345 | ||
346 | ||
347 | /* Convert the result to success code */ | |
348 | static int st_chk_result(struct scsi_tape *STp, struct scsi_request * SRpnt) | |
349 | { | |
350 | int result = SRpnt->sr_result; | |
351 | u8 scode; | |
352 | DEB(const char *stp;) | |
353 | char *name = tape_name(STp); | |
354 | struct st_cmdstatus *cmdstatp; | |
355 | ||
356 | if (!result) | |
357 | return 0; | |
358 | ||
359 | cmdstatp = &STp->buffer->cmdstat; | |
f03a5670 | 360 | st_analyze_sense(SRpnt, cmdstatp); |
1da177e4 LT |
361 | |
362 | if (cmdstatp->have_sense) | |
363 | scode = STp->buffer->cmdstat.sense_hdr.sense_key; | |
364 | else | |
365 | scode = 0; | |
366 | ||
367 | DEB( | |
368 | if (debugging) { | |
369 | printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x Len: %d\n", | |
370 | name, result, | |
371 | SRpnt->sr_cmnd[0], SRpnt->sr_cmnd[1], SRpnt->sr_cmnd[2], | |
372 | SRpnt->sr_cmnd[3], SRpnt->sr_cmnd[4], SRpnt->sr_cmnd[5], | |
373 | SRpnt->sr_bufflen); | |
374 | if (cmdstatp->have_sense) | |
375 | scsi_print_req_sense("st", SRpnt); | |
376 | } ) /* end DEB */ | |
377 | if (!debugging) { /* Abnormal conditions for tape */ | |
378 | if (!cmdstatp->have_sense) | |
379 | printk(KERN_WARNING | |
380 | "%s: Error %x (sugg. bt 0x%x, driver bt 0x%x, host bt 0x%x).\n", | |
381 | name, result, suggestion(result), | |
382 | driver_byte(result) & DRIVER_MASK, host_byte(result)); | |
383 | else if (cmdstatp->have_sense && | |
384 | scode != NO_SENSE && | |
385 | scode != RECOVERED_ERROR && | |
386 | /* scode != UNIT_ATTENTION && */ | |
387 | scode != BLANK_CHECK && | |
388 | scode != VOLUME_OVERFLOW && | |
389 | SRpnt->sr_cmnd[0] != MODE_SENSE && | |
390 | SRpnt->sr_cmnd[0] != TEST_UNIT_READY) { | |
391 | printk(KERN_WARNING "%s: Error with sense data: ", name); | |
392 | scsi_print_req_sense("st", SRpnt); | |
393 | } | |
394 | } | |
395 | ||
396 | if (cmdstatp->fixed_format && | |
397 | STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ | |
398 | if (STp->cln_sense_value) | |
399 | STp->cleaning_req |= ((SRpnt->sr_sense_buffer[STp->cln_mode] & | |
400 | STp->cln_sense_mask) == STp->cln_sense_value); | |
401 | else | |
402 | STp->cleaning_req |= ((SRpnt->sr_sense_buffer[STp->cln_mode] & | |
403 | STp->cln_sense_mask) != 0); | |
404 | } | |
405 | if (cmdstatp->have_sense && | |
406 | cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17) | |
407 | STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */ | |
408 | ||
409 | STp->pos_unknown |= STp->device->was_reset; | |
410 | ||
411 | if (cmdstatp->have_sense && | |
412 | scode == RECOVERED_ERROR | |
413 | #if ST_RECOVERED_WRITE_FATAL | |
414 | && SRpnt->sr_cmnd[0] != WRITE_6 | |
415 | && SRpnt->sr_cmnd[0] != WRITE_FILEMARKS | |
416 | #endif | |
417 | ) { | |
418 | STp->recover_count++; | |
419 | STp->recover_reg++; | |
420 | ||
421 | DEB( | |
422 | if (debugging) { | |
423 | if (SRpnt->sr_cmnd[0] == READ_6) | |
424 | stp = "read"; | |
425 | else if (SRpnt->sr_cmnd[0] == WRITE_6) | |
426 | stp = "write"; | |
427 | else | |
428 | stp = "ioctl"; | |
429 | printk(ST_DEB_MSG "%s: Recovered %s error (%d).\n", name, stp, | |
430 | STp->recover_count); | |
431 | } ) /* end DEB */ | |
432 | ||
433 | if (cmdstatp->flags == 0) | |
434 | return 0; | |
435 | } | |
436 | return (-EIO); | |
437 | } | |
438 | ||
439 | ||
440 | /* Wakeup from interrupt */ | |
441 | static void st_sleep_done(struct scsi_cmnd * SCpnt) | |
442 | { | |
443 | struct scsi_tape *STp = container_of(SCpnt->request->rq_disk->private_data, | |
444 | struct scsi_tape, driver); | |
445 | ||
446 | (STp->buffer)->cmdstat.midlevel_result = SCpnt->result; | |
447 | SCpnt->request->rq_status = RQ_SCSI_DONE; | |
1da177e4 LT |
448 | DEB( STp->write_pending = 0; ) |
449 | ||
f03a5670 KM |
450 | if (SCpnt->request->waiting) |
451 | complete(SCpnt->request->waiting); | |
1da177e4 LT |
452 | } |
453 | ||
454 | /* Do the scsi command. Waits until command performed if do_wait is true. | |
455 | Otherwise write_behind_check() is used to check that the command | |
456 | has finished. */ | |
457 | static struct scsi_request * | |
458 | st_do_scsi(struct scsi_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, | |
459 | int bytes, int direction, int timeout, int retries, int do_wait) | |
460 | { | |
f03a5670 | 461 | struct completion *waiting; |
1da177e4 LT |
462 | unsigned char *bp; |
463 | ||
f03a5670 KM |
464 | /* if async, make sure there's no command outstanding */ |
465 | if (!do_wait && ((STp->buffer)->last_SRpnt)) { | |
466 | printk(KERN_ERR "%s: Async command already active.\n", | |
467 | tape_name(STp)); | |
468 | if (signal_pending(current)) | |
469 | (STp->buffer)->syscall_result = (-EINTR); | |
470 | else | |
471 | (STp->buffer)->syscall_result = (-EBUSY); | |
472 | return NULL; | |
473 | } | |
474 | ||
1da177e4 LT |
475 | if (SRpnt == NULL) { |
476 | SRpnt = scsi_allocate_request(STp->device, GFP_ATOMIC); | |
477 | if (SRpnt == NULL) { | |
478 | DEBC( printk(KERN_ERR "%s: Can't get SCSI request.\n", | |
479 | tape_name(STp)); ); | |
480 | if (signal_pending(current)) | |
481 | (STp->buffer)->syscall_result = (-EINTR); | |
482 | else | |
483 | (STp->buffer)->syscall_result = (-EBUSY); | |
484 | return NULL; | |
485 | } | |
486 | } | |
487 | ||
f03a5670 KM |
488 | /* If async IO, set last_SRpnt. This ptr tells write_behind_check |
489 | which IO is outstanding. It's nulled out when the IO completes. */ | |
490 | if (!do_wait) | |
491 | (STp->buffer)->last_SRpnt = SRpnt; | |
492 | ||
493 | waiting = &STp->wait; | |
494 | init_completion(waiting); | |
1da177e4 LT |
495 | SRpnt->sr_use_sg = STp->buffer->do_dio || (bytes > (STp->buffer)->frp[0].length); |
496 | if (SRpnt->sr_use_sg) { | |
497 | if (!STp->buffer->do_dio) | |
498 | buf_to_sg(STp->buffer, bytes); | |
499 | SRpnt->sr_use_sg = (STp->buffer)->sg_segs; | |
500 | bp = (char *) &((STp->buffer)->sg[0]); | |
501 | } else | |
502 | bp = (STp->buffer)->b_data; | |
503 | SRpnt->sr_data_direction = direction; | |
504 | SRpnt->sr_cmd_len = 0; | |
f03a5670 | 505 | SRpnt->sr_request->waiting = waiting; |
1da177e4 LT |
506 | SRpnt->sr_request->rq_status = RQ_SCSI_BUSY; |
507 | SRpnt->sr_request->rq_disk = STp->disk; | |
f03a5670 | 508 | SRpnt->sr_request->end_io = blk_end_sync_rq; |
1da177e4 LT |
509 | STp->buffer->cmdstat.have_sense = 0; |
510 | ||
511 | scsi_do_req(SRpnt, (void *) cmd, bp, bytes, | |
512 | st_sleep_done, timeout, retries); | |
513 | ||
514 | if (do_wait) { | |
f03a5670 | 515 | wait_for_completion(waiting); |
1da177e4 | 516 | SRpnt->sr_request->waiting = NULL; |
f03a5670 KM |
517 | if (SRpnt->sr_request->rq_status != RQ_SCSI_DONE) |
518 | SRpnt->sr_result |= (DRIVER_ERROR << 24); | |
1da177e4 LT |
519 | (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); |
520 | } | |
521 | return SRpnt; | |
522 | } | |
523 | ||
524 | ||
525 | /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if | |
526 | write has been correct but EOM early warning reached, -EIO if write ended in | |
527 | error or zero if write successful. Asynchronous writes are used only in | |
528 | variable block mode. */ | |
529 | static int write_behind_check(struct scsi_tape * STp) | |
530 | { | |
531 | int retval = 0; | |
532 | struct st_buffer *STbuffer; | |
533 | struct st_partstat *STps; | |
534 | struct st_cmdstatus *cmdstatp; | |
f03a5670 | 535 | struct scsi_request *SRpnt; |
1da177e4 LT |
536 | |
537 | STbuffer = STp->buffer; | |
538 | if (!STbuffer->writing) | |
539 | return 0; | |
540 | ||
541 | DEB( | |
542 | if (STp->write_pending) | |
543 | STp->nbr_waits++; | |
544 | else | |
545 | STp->nbr_finished++; | |
546 | ) /* end DEB */ | |
547 | ||
548 | wait_for_completion(&(STp->wait)); | |
f03a5670 KM |
549 | SRpnt = STbuffer->last_SRpnt; |
550 | STbuffer->last_SRpnt = NULL; | |
551 | SRpnt->sr_request->waiting = NULL; | |
552 | if (SRpnt->sr_request->rq_status != RQ_SCSI_DONE) | |
553 | SRpnt->sr_result |= (DRIVER_ERROR << 24); | |
1da177e4 | 554 | |
f03a5670 KM |
555 | (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); |
556 | scsi_release_request(SRpnt); | |
1da177e4 LT |
557 | |
558 | STbuffer->buffer_bytes -= STbuffer->writing; | |
559 | STps = &(STp->ps[STp->partition]); | |
560 | if (STps->drv_block >= 0) { | |
561 | if (STp->block_size == 0) | |
562 | STps->drv_block++; | |
563 | else | |
564 | STps->drv_block += STbuffer->writing / STp->block_size; | |
565 | } | |
566 | ||
567 | cmdstatp = &STbuffer->cmdstat; | |
568 | if (STbuffer->syscall_result) { | |
569 | retval = -EIO; | |
570 | if (cmdstatp->have_sense && !cmdstatp->deferred && | |
571 | (cmdstatp->flags & SENSE_EOM) && | |
572 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
573 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) { | |
574 | /* EOM at write-behind, has all data been written? */ | |
575 | if (!cmdstatp->remainder_valid || | |
576 | cmdstatp->uremainder64 == 0) | |
577 | retval = -ENOSPC; | |
578 | } | |
579 | if (retval == -EIO) | |
580 | STps->drv_block = -1; | |
581 | } | |
582 | STbuffer->writing = 0; | |
583 | ||
584 | DEB(if (debugging && retval) | |
585 | printk(ST_DEB_MSG "%s: Async write error %x, return value %d.\n", | |
586 | tape_name(STp), STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */ | |
587 | ||
588 | return retval; | |
589 | } | |
590 | ||
591 | ||
592 | /* Step over EOF if it has been inadvertently crossed (ioctl not used because | |
593 | it messes up the block number). */ | |
594 | static int cross_eof(struct scsi_tape * STp, int forward) | |
595 | { | |
596 | struct scsi_request *SRpnt; | |
597 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
598 | ||
599 | cmd[0] = SPACE; | |
600 | cmd[1] = 0x01; /* Space FileMarks */ | |
601 | if (forward) { | |
602 | cmd[2] = cmd[3] = 0; | |
603 | cmd[4] = 1; | |
604 | } else | |
605 | cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ | |
606 | cmd[5] = 0; | |
607 | ||
608 | DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n", | |
609 | tape_name(STp), forward ? "forward" : "backward")); | |
610 | ||
611 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, | |
612 | STp->device->timeout, MAX_RETRIES, 1); | |
613 | if (!SRpnt) | |
614 | return (STp->buffer)->syscall_result; | |
615 | ||
616 | scsi_release_request(SRpnt); | |
617 | SRpnt = NULL; | |
618 | ||
619 | if ((STp->buffer)->cmdstat.midlevel_result != 0) | |
620 | printk(KERN_ERR "%s: Stepping over filemark %s failed.\n", | |
621 | tape_name(STp), forward ? "forward" : "backward"); | |
622 | ||
623 | return (STp->buffer)->syscall_result; | |
624 | } | |
625 | ||
626 | ||
627 | /* Flush the write buffer (never need to write if variable blocksize). */ | |
628 | static int flush_write_buffer(struct scsi_tape * STp) | |
629 | { | |
630 | int offset, transfer, blks; | |
631 | int result; | |
632 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
633 | struct scsi_request *SRpnt; | |
634 | struct st_partstat *STps; | |
635 | ||
636 | result = write_behind_check(STp); | |
637 | if (result) | |
638 | return result; | |
639 | ||
640 | result = 0; | |
641 | if (STp->dirty == 1) { | |
642 | ||
643 | offset = (STp->buffer)->buffer_bytes; | |
644 | transfer = ((offset + STp->block_size - 1) / | |
645 | STp->block_size) * STp->block_size; | |
646 | DEBC(printk(ST_DEB_MSG "%s: Flushing %d bytes.\n", | |
647 | tape_name(STp), transfer)); | |
648 | ||
649 | memset((STp->buffer)->b_data + offset, 0, transfer - offset); | |
650 | ||
651 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
652 | cmd[0] = WRITE_6; | |
653 | cmd[1] = 1; | |
654 | blks = transfer / STp->block_size; | |
655 | cmd[2] = blks >> 16; | |
656 | cmd[3] = blks >> 8; | |
657 | cmd[4] = blks; | |
658 | ||
659 | SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE, | |
660 | STp->device->timeout, MAX_WRITE_RETRIES, 1); | |
661 | if (!SRpnt) | |
662 | return (STp->buffer)->syscall_result; | |
663 | ||
664 | STps = &(STp->ps[STp->partition]); | |
665 | if ((STp->buffer)->syscall_result != 0) { | |
666 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
667 | ||
668 | if (cmdstatp->have_sense && !cmdstatp->deferred && | |
669 | (cmdstatp->flags & SENSE_EOM) && | |
670 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
671 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && | |
672 | (!cmdstatp->remainder_valid || | |
673 | cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */ | |
674 | STp->dirty = 0; | |
675 | (STp->buffer)->buffer_bytes = 0; | |
676 | if (STps->drv_block >= 0) | |
677 | STps->drv_block += blks; | |
678 | result = (-ENOSPC); | |
679 | } else { | |
680 | printk(KERN_ERR "%s: Error on flush.\n", | |
681 | tape_name(STp)); | |
682 | STps->drv_block = (-1); | |
683 | result = (-EIO); | |
684 | } | |
685 | } else { | |
686 | if (STps->drv_block >= 0) | |
687 | STps->drv_block += blks; | |
688 | STp->dirty = 0; | |
689 | (STp->buffer)->buffer_bytes = 0; | |
690 | } | |
691 | scsi_release_request(SRpnt); | |
692 | SRpnt = NULL; | |
693 | } | |
694 | return result; | |
695 | } | |
696 | ||
697 | ||
698 | /* Flush the tape buffer. The tape will be positioned correctly unless | |
699 | seek_next is true. */ | |
700 | static int flush_buffer(struct scsi_tape *STp, int seek_next) | |
701 | { | |
702 | int backspace, result; | |
703 | struct st_buffer *STbuffer; | |
704 | struct st_partstat *STps; | |
705 | ||
706 | STbuffer = STp->buffer; | |
707 | ||
708 | /* | |
709 | * If there was a bus reset, block further access | |
710 | * to this device. | |
711 | */ | |
712 | if (STp->pos_unknown) | |
713 | return (-EIO); | |
714 | ||
715 | if (STp->ready != ST_READY) | |
716 | return 0; | |
717 | STps = &(STp->ps[STp->partition]); | |
718 | if (STps->rw == ST_WRITING) /* Writing */ | |
719 | return flush_write_buffer(STp); | |
720 | ||
721 | if (STp->block_size == 0) | |
722 | return 0; | |
723 | ||
724 | backspace = ((STp->buffer)->buffer_bytes + | |
725 | (STp->buffer)->read_pointer) / STp->block_size - | |
726 | ((STp->buffer)->read_pointer + STp->block_size - 1) / | |
727 | STp->block_size; | |
728 | (STp->buffer)->buffer_bytes = 0; | |
729 | (STp->buffer)->read_pointer = 0; | |
730 | result = 0; | |
731 | if (!seek_next) { | |
732 | if (STps->eof == ST_FM_HIT) { | |
733 | result = cross_eof(STp, 0); /* Back over the EOF hit */ | |
734 | if (!result) | |
735 | STps->eof = ST_NOEOF; | |
736 | else { | |
737 | if (STps->drv_file >= 0) | |
738 | STps->drv_file++; | |
739 | STps->drv_block = 0; | |
740 | } | |
741 | } | |
742 | if (!result && backspace > 0) | |
743 | result = st_int_ioctl(STp, MTBSR, backspace); | |
744 | } else if (STps->eof == ST_FM_HIT) { | |
745 | if (STps->drv_file >= 0) | |
746 | STps->drv_file++; | |
747 | STps->drv_block = 0; | |
748 | STps->eof = ST_NOEOF; | |
749 | } | |
750 | return result; | |
751 | ||
752 | } | |
753 | \f | |
754 | /* Set the mode parameters */ | |
755 | static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm) | |
756 | { | |
757 | int set_it = 0; | |
758 | unsigned long arg; | |
759 | char *name = tape_name(STp); | |
760 | ||
761 | if (!STp->density_changed && | |
762 | STm->default_density >= 0 && | |
763 | STm->default_density != STp->density) { | |
764 | arg = STm->default_density; | |
765 | set_it = 1; | |
766 | } else | |
767 | arg = STp->density; | |
768 | arg <<= MT_ST_DENSITY_SHIFT; | |
769 | if (!STp->blksize_changed && | |
770 | STm->default_blksize >= 0 && | |
771 | STm->default_blksize != STp->block_size) { | |
772 | arg |= STm->default_blksize; | |
773 | set_it = 1; | |
774 | } else | |
775 | arg |= STp->block_size; | |
776 | if (set_it && | |
777 | st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) { | |
778 | printk(KERN_WARNING | |
779 | "%s: Can't set default block size to %d bytes and density %x.\n", | |
780 | name, STm->default_blksize, STm->default_density); | |
781 | if (modes_defined) | |
782 | return (-EINVAL); | |
783 | } | |
784 | return 0; | |
785 | } | |
786 | ||
787 | ||
788 | /* Lock or unlock the drive door. Don't use when scsi_request allocated. */ | |
789 | static int do_door_lock(struct scsi_tape * STp, int do_lock) | |
790 | { | |
791 | int retval, cmd; | |
792 | DEB(char *name = tape_name(STp);) | |
793 | ||
794 | ||
795 | cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK; | |
796 | DEBC(printk(ST_DEB_MSG "%s: %socking drive door.\n", name, | |
797 | do_lock ? "L" : "Unl")); | |
798 | retval = scsi_ioctl(STp->device, cmd, NULL); | |
799 | if (!retval) { | |
800 | STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; | |
801 | } | |
802 | else { | |
803 | STp->door_locked = ST_LOCK_FAILS; | |
804 | } | |
805 | return retval; | |
806 | } | |
807 | ||
808 | ||
809 | /* Set the internal state after reset */ | |
810 | static void reset_state(struct scsi_tape *STp) | |
811 | { | |
812 | int i; | |
813 | struct st_partstat *STps; | |
814 | ||
815 | STp->pos_unknown = 0; | |
816 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
817 | STps = &(STp->ps[i]); | |
818 | STps->rw = ST_IDLE; | |
819 | STps->eof = ST_NOEOF; | |
820 | STps->at_sm = 0; | |
821 | STps->last_block_valid = 0; | |
822 | STps->drv_block = -1; | |
823 | STps->drv_file = -1; | |
824 | } | |
825 | if (STp->can_partitions) { | |
826 | STp->partition = find_partition(STp); | |
827 | if (STp->partition < 0) | |
828 | STp->partition = 0; | |
829 | STp->new_partition = STp->partition; | |
830 | } | |
831 | } | |
832 | \f | |
833 | /* Test if the drive is ready. Returns either one of the codes below or a negative system | |
834 | error code. */ | |
835 | #define CHKRES_READY 0 | |
836 | #define CHKRES_NEW_SESSION 1 | |
837 | #define CHKRES_NOT_READY 2 | |
838 | #define CHKRES_NO_TAPE 3 | |
839 | ||
840 | #define MAX_ATTENTIONS 10 | |
841 | ||
842 | static int test_ready(struct scsi_tape *STp, int do_wait) | |
843 | { | |
844 | int attentions, waits, max_wait, scode; | |
845 | int retval = CHKRES_READY, new_session = 0; | |
846 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
847 | struct scsi_request *SRpnt = NULL; | |
848 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
849 | ||
850 | max_wait = do_wait ? ST_BLOCK_SECONDS : 0; | |
851 | ||
852 | for (attentions=waits=0; ; ) { | |
853 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
854 | cmd[0] = TEST_UNIT_READY; | |
855 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, | |
856 | STp->long_timeout, MAX_READY_RETRIES, 1); | |
857 | ||
858 | if (!SRpnt) { | |
859 | retval = (STp->buffer)->syscall_result; | |
860 | break; | |
861 | } | |
862 | ||
863 | if (cmdstatp->have_sense) { | |
864 | ||
865 | scode = cmdstatp->sense_hdr.sense_key; | |
866 | ||
867 | if (scode == UNIT_ATTENTION) { /* New media? */ | |
868 | new_session = 1; | |
869 | if (attentions < MAX_ATTENTIONS) { | |
870 | attentions++; | |
871 | continue; | |
872 | } | |
873 | else { | |
874 | retval = (-EIO); | |
875 | break; | |
876 | } | |
877 | } | |
878 | ||
879 | if (scode == NOT_READY) { | |
880 | if (waits < max_wait) { | |
881 | if (msleep_interruptible(1000)) { | |
882 | retval = (-EINTR); | |
883 | break; | |
884 | } | |
885 | waits++; | |
886 | continue; | |
887 | } | |
888 | else { | |
889 | if ((STp->device)->scsi_level >= SCSI_2 && | |
890 | cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */ | |
891 | retval = CHKRES_NO_TAPE; | |
892 | else | |
893 | retval = CHKRES_NOT_READY; | |
894 | break; | |
895 | } | |
896 | } | |
897 | } | |
898 | ||
899 | retval = (STp->buffer)->syscall_result; | |
900 | if (!retval) | |
901 | retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY; | |
902 | break; | |
903 | } | |
904 | ||
905 | if (SRpnt != NULL) | |
906 | scsi_release_request(SRpnt); | |
907 | return retval; | |
908 | } | |
909 | ||
910 | ||
911 | /* See if the drive is ready and gather information about the tape. Return values: | |
912 | < 0 negative error code from errno.h | |
913 | 0 drive ready | |
914 | 1 drive not ready (possibly no tape) | |
915 | */ | |
916 | static int check_tape(struct scsi_tape *STp, struct file *filp) | |
917 | { | |
918 | int i, retval, new_session = 0, do_wait; | |
919 | unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning; | |
920 | unsigned short st_flags = filp->f_flags; | |
921 | struct scsi_request *SRpnt = NULL; | |
922 | struct st_modedef *STm; | |
923 | struct st_partstat *STps; | |
924 | char *name = tape_name(STp); | |
925 | struct inode *inode = filp->f_dentry->d_inode; | |
926 | int mode = TAPE_MODE(inode); | |
927 | ||
928 | STp->ready = ST_READY; | |
929 | ||
930 | if (mode != STp->current_mode) { | |
931 | DEBC(printk(ST_DEB_MSG "%s: Mode change from %d to %d.\n", | |
932 | name, STp->current_mode, mode)); | |
933 | new_session = 1; | |
934 | STp->current_mode = mode; | |
935 | } | |
936 | STm = &(STp->modes[STp->current_mode]); | |
937 | ||
938 | saved_cleaning = STp->cleaning_req; | |
939 | STp->cleaning_req = 0; | |
940 | ||
941 | do_wait = ((filp->f_flags & O_NONBLOCK) == 0); | |
942 | retval = test_ready(STp, do_wait); | |
943 | ||
944 | if (retval < 0) | |
945 | goto err_out; | |
946 | ||
947 | if (retval == CHKRES_NEW_SESSION) { | |
948 | STp->pos_unknown = 0; | |
949 | STp->partition = STp->new_partition = 0; | |
950 | if (STp->can_partitions) | |
951 | STp->nbr_partitions = 1; /* This guess will be updated later | |
952 | if necessary */ | |
953 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
954 | STps = &(STp->ps[i]); | |
955 | STps->rw = ST_IDLE; | |
956 | STps->eof = ST_NOEOF; | |
957 | STps->at_sm = 0; | |
958 | STps->last_block_valid = 0; | |
959 | STps->drv_block = 0; | |
960 | STps->drv_file = 0; | |
961 | } | |
962 | new_session = 1; | |
963 | } | |
964 | else { | |
965 | STp->cleaning_req |= saved_cleaning; | |
966 | ||
967 | if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) { | |
968 | if (retval == CHKRES_NO_TAPE) | |
969 | STp->ready = ST_NO_TAPE; | |
970 | else | |
971 | STp->ready = ST_NOT_READY; | |
972 | ||
973 | STp->density = 0; /* Clear the erroneous "residue" */ | |
974 | STp->write_prot = 0; | |
975 | STp->block_size = 0; | |
976 | STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); | |
977 | STp->partition = STp->new_partition = 0; | |
978 | STp->door_locked = ST_UNLOCKED; | |
979 | return CHKRES_NOT_READY; | |
980 | } | |
981 | } | |
982 | ||
983 | if (STp->omit_blklims) | |
984 | STp->min_block = STp->max_block = (-1); | |
985 | else { | |
986 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
987 | cmd[0] = READ_BLOCK_LIMITS; | |
988 | ||
989 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, | |
990 | STp->device->timeout, MAX_READY_RETRIES, 1); | |
991 | if (!SRpnt) { | |
992 | retval = (STp->buffer)->syscall_result; | |
993 | goto err_out; | |
994 | } | |
995 | ||
996 | if (!SRpnt->sr_result && !STp->buffer->cmdstat.have_sense) { | |
997 | STp->max_block = ((STp->buffer)->b_data[1] << 16) | | |
998 | ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; | |
999 | STp->min_block = ((STp->buffer)->b_data[4] << 8) | | |
1000 | (STp->buffer)->b_data[5]; | |
1001 | if ( DEB( debugging || ) !STp->inited) | |
1002 | printk(KERN_WARNING | |
1003 | "%s: Block limits %d - %d bytes.\n", name, | |
1004 | STp->min_block, STp->max_block); | |
1005 | } else { | |
1006 | STp->min_block = STp->max_block = (-1); | |
1007 | DEBC(printk(ST_DEB_MSG "%s: Can't read block limits.\n", | |
1008 | name)); | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
1013 | cmd[0] = MODE_SENSE; | |
1014 | cmd[4] = 12; | |
1015 | ||
1016 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, | |
1017 | STp->device->timeout, MAX_READY_RETRIES, 1); | |
1018 | if (!SRpnt) { | |
1019 | retval = (STp->buffer)->syscall_result; | |
1020 | goto err_out; | |
1021 | } | |
1022 | ||
1023 | if ((STp->buffer)->syscall_result != 0) { | |
1024 | DEBC(printk(ST_DEB_MSG "%s: No Mode Sense.\n", name)); | |
1025 | STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ | |
1026 | (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ | |
1027 | STp->drv_write_prot = 0; | |
1028 | } else { | |
1029 | DEBC(printk(ST_DEB_MSG | |
1030 | "%s: Mode sense. Length %d, medium %x, WBS %x, BLL %d\n", | |
1031 | name, | |
1032 | (STp->buffer)->b_data[0], (STp->buffer)->b_data[1], | |
1033 | (STp->buffer)->b_data[2], (STp->buffer)->b_data[3])); | |
1034 | ||
1035 | if ((STp->buffer)->b_data[3] >= 8) { | |
1036 | STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; | |
1037 | STp->density = (STp->buffer)->b_data[4]; | |
1038 | STp->block_size = (STp->buffer)->b_data[9] * 65536 + | |
1039 | (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; | |
1040 | DEBC(printk(ST_DEB_MSG | |
1041 | "%s: Density %x, tape length: %x, drv buffer: %d\n", | |
1042 | name, STp->density, (STp->buffer)->b_data[5] * 65536 + | |
1043 | (STp->buffer)->b_data[6] * 256 + (STp->buffer)->b_data[7], | |
1044 | STp->drv_buffer)); | |
1045 | } | |
1046 | STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; | |
1047 | } | |
1048 | scsi_release_request(SRpnt); | |
1049 | SRpnt = NULL; | |
1050 | STp->inited = 1; | |
1051 | ||
1052 | if (STp->block_size > 0) | |
1053 | (STp->buffer)->buffer_blocks = | |
1054 | (STp->buffer)->buffer_size / STp->block_size; | |
1055 | else | |
1056 | (STp->buffer)->buffer_blocks = 1; | |
1057 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; | |
1058 | ||
1059 | DEBC(printk(ST_DEB_MSG | |
1060 | "%s: Block size: %d, buffer size: %d (%d blocks).\n", name, | |
1061 | STp->block_size, (STp->buffer)->buffer_size, | |
1062 | (STp->buffer)->buffer_blocks)); | |
1063 | ||
1064 | if (STp->drv_write_prot) { | |
1065 | STp->write_prot = 1; | |
1066 | ||
1067 | DEBC(printk(ST_DEB_MSG "%s: Write protected\n", name)); | |
1068 | ||
1069 | if (do_wait && | |
1070 | ((st_flags & O_ACCMODE) == O_WRONLY || | |
1071 | (st_flags & O_ACCMODE) == O_RDWR)) { | |
1072 | retval = (-EROFS); | |
1073 | goto err_out; | |
1074 | } | |
1075 | } | |
1076 | ||
1077 | if (STp->can_partitions && STp->nbr_partitions < 1) { | |
1078 | /* This code is reached when the device is opened for the first time | |
1079 | after the driver has been initialized with tape in the drive and the | |
1080 | partition support has been enabled. */ | |
1081 | DEBC(printk(ST_DEB_MSG | |
1082 | "%s: Updating partition number in status.\n", name)); | |
1083 | if ((STp->partition = find_partition(STp)) < 0) { | |
1084 | retval = STp->partition; | |
1085 | goto err_out; | |
1086 | } | |
1087 | STp->new_partition = STp->partition; | |
1088 | STp->nbr_partitions = 1; /* This guess will be updated when necessary */ | |
1089 | } | |
1090 | ||
1091 | if (new_session) { /* Change the drive parameters for the new mode */ | |
1092 | STp->density_changed = STp->blksize_changed = 0; | |
1093 | STp->compression_changed = 0; | |
1094 | if (!(STm->defaults_for_writes) && | |
1095 | (retval = set_mode_densblk(STp, STm)) < 0) | |
1096 | goto err_out; | |
1097 | ||
1098 | if (STp->default_drvbuffer != 0xff) { | |
1099 | if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer)) | |
1100 | printk(KERN_WARNING | |
1101 | "%s: Can't set default drive buffering to %d.\n", | |
1102 | name, STp->default_drvbuffer); | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | return CHKRES_READY; | |
1107 | ||
1108 | err_out: | |
1109 | return retval; | |
1110 | } | |
1111 | ||
1112 | ||
1113 | \f/* Open the device. Needs to be called with BKL only because of incrementing the SCSI host | |
1114 | module count. */ | |
1115 | static int st_open(struct inode *inode, struct file *filp) | |
1116 | { | |
1117 | int i, retval = (-EIO); | |
1118 | struct scsi_tape *STp; | |
1119 | struct st_partstat *STps; | |
1120 | int dev = TAPE_NR(inode); | |
1121 | char *name; | |
1122 | ||
1123 | /* | |
1124 | * We really want to do nonseekable_open(inode, filp); here, but some | |
1125 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
1126 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
1127 | */ | |
1128 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
1129 | ||
f03a5670 KM |
1130 | if (!(STp = scsi_tape_get(dev))) |
1131 | return -ENXIO; | |
1132 | ||
1da177e4 | 1133 | write_lock(&st_dev_arr_lock); |
1da177e4 LT |
1134 | filp->private_data = STp; |
1135 | name = tape_name(STp); | |
1136 | ||
1137 | if (STp->in_use) { | |
1138 | write_unlock(&st_dev_arr_lock); | |
f03a5670 | 1139 | scsi_tape_put(STp); |
1da177e4 LT |
1140 | DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); ) |
1141 | return (-EBUSY); | |
1142 | } | |
1143 | ||
1da177e4 LT |
1144 | STp->in_use = 1; |
1145 | write_unlock(&st_dev_arr_lock); | |
1146 | STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; | |
1147 | ||
1148 | if (!scsi_block_when_processing_errors(STp->device)) { | |
1149 | retval = (-ENXIO); | |
1150 | goto err_out; | |
1151 | } | |
1152 | ||
1153 | /* See that we have at least a one page buffer available */ | |
1154 | if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) { | |
1155 | printk(KERN_WARNING "%s: Can't allocate one page tape buffer.\n", | |
1156 | name); | |
1157 | retval = (-EOVERFLOW); | |
1158 | goto err_out; | |
1159 | } | |
1160 | ||
1161 | (STp->buffer)->writing = 0; | |
1162 | (STp->buffer)->syscall_result = 0; | |
1163 | ||
1164 | STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY); | |
1165 | ||
1166 | STp->dirty = 0; | |
1167 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
1168 | STps = &(STp->ps[i]); | |
1169 | STps->rw = ST_IDLE; | |
1170 | } | |
1171 | STp->recover_count = 0; | |
1172 | DEB( STp->nbr_waits = STp->nbr_finished = 0; | |
1173 | STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = STp->nbr_combinable = 0; ) | |
1174 | ||
1175 | retval = check_tape(STp, filp); | |
1176 | if (retval < 0) | |
1177 | goto err_out; | |
1178 | if ((filp->f_flags & O_NONBLOCK) == 0 && | |
1179 | retval != CHKRES_READY) { | |
1180 | retval = (-EIO); | |
1181 | goto err_out; | |
1182 | } | |
1183 | return 0; | |
1184 | ||
1185 | err_out: | |
1186 | normalize_buffer(STp->buffer); | |
1187 | STp->in_use = 0; | |
f03a5670 | 1188 | scsi_tape_put(STp); |
1da177e4 LT |
1189 | return retval; |
1190 | ||
1191 | } | |
1192 | \f | |
1193 | ||
1194 | /* Flush the tape buffer before close */ | |
1195 | static int st_flush(struct file *filp) | |
1196 | { | |
1197 | int result = 0, result2; | |
1198 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
1199 | struct scsi_request *SRpnt; | |
1200 | struct scsi_tape *STp = filp->private_data; | |
1201 | struct st_modedef *STm = &(STp->modes[STp->current_mode]); | |
1202 | struct st_partstat *STps = &(STp->ps[STp->partition]); | |
1203 | char *name = tape_name(STp); | |
1204 | ||
1205 | if (file_count(filp) > 1) | |
1206 | return 0; | |
1207 | ||
1208 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { | |
1209 | result = flush_write_buffer(STp); | |
1210 | if (result != 0 && result != (-ENOSPC)) | |
1211 | goto out; | |
1212 | } | |
1213 | ||
1214 | if (STp->can_partitions && | |
1215 | (result2 = switch_partition(STp)) < 0) { | |
1216 | DEBC(printk(ST_DEB_MSG | |
1217 | "%s: switch_partition at close failed.\n", name)); | |
1218 | if (result == 0) | |
1219 | result = result2; | |
1220 | goto out; | |
1221 | } | |
1222 | ||
1223 | DEBC( if (STp->nbr_requests) | |
1224 | printk(KERN_WARNING "%s: Number of r/w requests %d, dio used in %d, pages %d (%d).\n", | |
1225 | name, STp->nbr_requests, STp->nbr_dio, STp->nbr_pages, STp->nbr_combinable)); | |
1226 | ||
1227 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { | |
1228 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1229 | ||
1230 | DEBC(printk(ST_DEB_MSG "%s: Async write waits %d, finished %d.\n", | |
1231 | name, STp->nbr_waits, STp->nbr_finished); | |
1232 | ) | |
1233 | ||
1234 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1235 | cmd[0] = WRITE_FILEMARKS; | |
1236 | cmd[4] = 1 + STp->two_fm; | |
1237 | ||
1238 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, | |
1239 | STp->device->timeout, MAX_WRITE_RETRIES, 1); | |
1240 | if (!SRpnt) { | |
1241 | result = (STp->buffer)->syscall_result; | |
1242 | goto out; | |
1243 | } | |
1244 | ||
1245 | if (STp->buffer->syscall_result == 0 || | |
1246 | (cmdstatp->have_sense && !cmdstatp->deferred && | |
1247 | (cmdstatp->flags & SENSE_EOM) && | |
1248 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
1249 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && | |
1250 | (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) { | |
1251 | /* Write successful at EOM */ | |
1252 | scsi_release_request(SRpnt); | |
1253 | SRpnt = NULL; | |
1254 | if (STps->drv_file >= 0) | |
1255 | STps->drv_file++; | |
1256 | STps->drv_block = 0; | |
1257 | if (STp->two_fm) | |
1258 | cross_eof(STp, 0); | |
1259 | STps->eof = ST_FM; | |
1260 | } | |
1261 | else { /* Write error */ | |
1262 | scsi_release_request(SRpnt); | |
1263 | SRpnt = NULL; | |
1264 | printk(KERN_ERR "%s: Error on write filemark.\n", name); | |
1265 | if (result == 0) | |
1266 | result = (-EIO); | |
1267 | } | |
1268 | ||
1269 | DEBC(printk(ST_DEB_MSG "%s: Buffer flushed, %d EOF(s) written\n", | |
1270 | name, cmd[4])); | |
1271 | } else if (!STp->rew_at_close) { | |
1272 | STps = &(STp->ps[STp->partition]); | |
1273 | if (!STm->sysv || STps->rw != ST_READING) { | |
1274 | if (STp->can_bsr) | |
1275 | result = flush_buffer(STp, 0); | |
1276 | else if (STps->eof == ST_FM_HIT) { | |
1277 | result = cross_eof(STp, 0); | |
1278 | if (result) { | |
1279 | if (STps->drv_file >= 0) | |
1280 | STps->drv_file++; | |
1281 | STps->drv_block = 0; | |
1282 | STps->eof = ST_FM; | |
1283 | } else | |
1284 | STps->eof = ST_NOEOF; | |
1285 | } | |
1286 | } else if ((STps->eof == ST_NOEOF && | |
1287 | !(result = cross_eof(STp, 1))) || | |
1288 | STps->eof == ST_FM_HIT) { | |
1289 | if (STps->drv_file >= 0) | |
1290 | STps->drv_file++; | |
1291 | STps->drv_block = 0; | |
1292 | STps->eof = ST_FM; | |
1293 | } | |
1294 | } | |
1295 | ||
1296 | out: | |
1297 | if (STp->rew_at_close) { | |
1298 | result2 = st_int_ioctl(STp, MTREW, 1); | |
1299 | if (result == 0) | |
1300 | result = result2; | |
1301 | } | |
1302 | return result; | |
1303 | } | |
1304 | ||
1305 | ||
1306 | /* Close the device and release it. BKL is not needed: this is the only thread | |
1307 | accessing this tape. */ | |
1308 | static int st_release(struct inode *inode, struct file *filp) | |
1309 | { | |
1310 | int result = 0; | |
1311 | struct scsi_tape *STp = filp->private_data; | |
1312 | ||
1313 | if (STp->door_locked == ST_LOCKED_AUTO) | |
1314 | do_door_lock(STp, 0); | |
1315 | ||
1316 | normalize_buffer(STp->buffer); | |
1317 | write_lock(&st_dev_arr_lock); | |
1318 | STp->in_use = 0; | |
1319 | write_unlock(&st_dev_arr_lock); | |
f03a5670 | 1320 | scsi_tape_put(STp); |
1da177e4 LT |
1321 | |
1322 | return result; | |
1323 | } | |
1324 | \f | |
1325 | /* The checks common to both reading and writing */ | |
1326 | static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count) | |
1327 | { | |
1328 | ssize_t retval = 0; | |
1329 | ||
1330 | /* | |
1331 | * If we are in the middle of error recovery, don't let anyone | |
1332 | * else try and use this device. Also, if error recovery fails, it | |
1333 | * may try and take the device offline, in which case all further | |
1334 | * access to the device is prohibited. | |
1335 | */ | |
1336 | if (!scsi_block_when_processing_errors(STp->device)) { | |
1337 | retval = (-ENXIO); | |
1338 | goto out; | |
1339 | } | |
1340 | ||
1341 | if (STp->ready != ST_READY) { | |
1342 | if (STp->ready == ST_NO_TAPE) | |
1343 | retval = (-ENOMEDIUM); | |
1344 | else | |
1345 | retval = (-EIO); | |
1346 | goto out; | |
1347 | } | |
1348 | ||
1349 | if (! STp->modes[STp->current_mode].defined) { | |
1350 | retval = (-ENXIO); | |
1351 | goto out; | |
1352 | } | |
1353 | ||
1354 | ||
1355 | /* | |
1356 | * If there was a bus reset, block further access | |
1357 | * to this device. | |
1358 | */ | |
1359 | if (STp->pos_unknown) { | |
1360 | retval = (-EIO); | |
1361 | goto out; | |
1362 | } | |
1363 | ||
1364 | if (count == 0) | |
1365 | goto out; | |
1366 | ||
1367 | DEB( | |
1368 | if (!STp->in_use) { | |
1369 | printk(ST_DEB_MSG "%s: Incorrect device.\n", tape_name(STp)); | |
1370 | retval = (-EIO); | |
1371 | goto out; | |
1372 | } ) /* end DEB */ | |
1373 | ||
1374 | if (STp->can_partitions && | |
1375 | (retval = switch_partition(STp)) < 0) | |
1376 | goto out; | |
1377 | ||
1378 | if (STp->block_size == 0 && STp->max_block > 0 && | |
1379 | (count < STp->min_block || count > STp->max_block)) { | |
1380 | retval = (-EINVAL); | |
1381 | goto out; | |
1382 | } | |
1383 | ||
1384 | if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && | |
1385 | !do_door_lock(STp, 1)) | |
1386 | STp->door_locked = ST_LOCKED_AUTO; | |
1387 | ||
1388 | out: | |
1389 | return retval; | |
1390 | } | |
1391 | ||
1392 | ||
1393 | static int setup_buffering(struct scsi_tape *STp, const char __user *buf, | |
1394 | size_t count, int is_read) | |
1395 | { | |
1396 | int i, bufsize, retval = 0; | |
1397 | struct st_buffer *STbp = STp->buffer; | |
1398 | ||
1399 | if (is_read) | |
1400 | i = STp->try_dio && try_rdio; | |
1401 | else | |
1402 | i = STp->try_dio && try_wdio; | |
1403 | if (i && ((unsigned long)buf & queue_dma_alignment( | |
1404 | STp->device->request_queue)) == 0) { | |
1405 | i = st_map_user_pages(&(STbp->sg[0]), STbp->use_sg, | |
1406 | (unsigned long)buf, count, (is_read ? READ : WRITE), | |
1407 | STp->max_pfn); | |
1408 | if (i > 0) { | |
1409 | STbp->do_dio = i; | |
1410 | STbp->buffer_bytes = 0; /* can be used as transfer counter */ | |
1411 | } | |
1412 | else | |
1413 | STbp->do_dio = 0; /* fall back to buffering with any error */ | |
1414 | STbp->sg_segs = STbp->do_dio; | |
1415 | STbp->frp_sg_current = 0; | |
1416 | DEB( | |
1417 | if (STbp->do_dio) { | |
1418 | STp->nbr_dio++; | |
1419 | STp->nbr_pages += STbp->do_dio; | |
1420 | for (i=1; i < STbp->do_dio; i++) | |
1421 | if (page_to_pfn(STbp->sg[i].page) == page_to_pfn(STbp->sg[i-1].page) + 1) | |
1422 | STp->nbr_combinable++; | |
1423 | } | |
1424 | ) | |
1425 | } else | |
1426 | STbp->do_dio = 0; | |
1427 | DEB( STp->nbr_requests++; ) | |
1428 | ||
1429 | if (!STbp->do_dio) { | |
1430 | if (STp->block_size) | |
1431 | bufsize = STp->block_size > st_fixed_buffer_size ? | |
1432 | STp->block_size : st_fixed_buffer_size; | |
1433 | else | |
1434 | bufsize = count; | |
1435 | if (bufsize > STbp->buffer_size && | |
1436 | !enlarge_buffer(STbp, bufsize, STp->restr_dma)) { | |
1437 | printk(KERN_WARNING "%s: Can't allocate %d byte tape buffer.\n", | |
1438 | tape_name(STp), bufsize); | |
1439 | retval = (-EOVERFLOW); | |
1440 | goto out; | |
1441 | } | |
1442 | if (STp->block_size) | |
1443 | STbp->buffer_blocks = bufsize / STp->block_size; | |
1444 | } | |
1445 | ||
1446 | out: | |
1447 | return retval; | |
1448 | } | |
1449 | ||
1450 | ||
1451 | /* Can be called more than once after each setup_buffer() */ | |
1452 | static void release_buffering(struct scsi_tape *STp) | |
1453 | { | |
1454 | struct st_buffer *STbp; | |
1455 | ||
1456 | STbp = STp->buffer; | |
1457 | if (STbp->do_dio) { | |
1458 | sgl_unmap_user_pages(&(STbp->sg[0]), STbp->do_dio, 0); | |
1459 | STbp->do_dio = 0; | |
1460 | } | |
1461 | } | |
1462 | ||
1463 | ||
1464 | /* Write command */ | |
1465 | static ssize_t | |
1466 | st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
1467 | { | |
1468 | ssize_t total; | |
1469 | ssize_t i, do_count, blks, transfer; | |
1470 | ssize_t retval; | |
1471 | int undone, retry_eot = 0, scode; | |
1472 | int async_write; | |
1473 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
1474 | const char __user *b_point; | |
1475 | struct scsi_request *SRpnt = NULL; | |
1476 | struct scsi_tape *STp = filp->private_data; | |
1477 | struct st_modedef *STm; | |
1478 | struct st_partstat *STps; | |
1479 | struct st_buffer *STbp; | |
1480 | char *name = tape_name(STp); | |
1481 | ||
1482 | if (down_interruptible(&STp->lock)) | |
1483 | return -ERESTARTSYS; | |
1484 | ||
1485 | retval = rw_checks(STp, filp, count); | |
1486 | if (retval || count == 0) | |
1487 | goto out; | |
1488 | ||
1489 | /* Write must be integral number of blocks */ | |
1490 | if (STp->block_size != 0 && (count % STp->block_size) != 0) { | |
1491 | printk(KERN_WARNING "%s: Write not multiple of tape block size.\n", | |
1492 | name); | |
1493 | retval = (-EINVAL); | |
1494 | goto out; | |
1495 | } | |
1496 | ||
1497 | STm = &(STp->modes[STp->current_mode]); | |
1498 | STps = &(STp->ps[STp->partition]); | |
1499 | ||
1500 | if (STp->write_prot) { | |
1501 | retval = (-EACCES); | |
1502 | goto out; | |
1503 | } | |
1504 | ||
1505 | ||
1506 | if (STps->rw == ST_READING) { | |
1507 | retval = flush_buffer(STp, 0); | |
1508 | if (retval) | |
1509 | goto out; | |
1510 | STps->rw = ST_WRITING; | |
1511 | } else if (STps->rw != ST_WRITING && | |
1512 | STps->drv_file == 0 && STps->drv_block == 0) { | |
1513 | if ((retval = set_mode_densblk(STp, STm)) < 0) | |
1514 | goto out; | |
1515 | if (STm->default_compression != ST_DONT_TOUCH && | |
1516 | !(STp->compression_changed)) { | |
1517 | if (st_compression(STp, (STm->default_compression == ST_YES))) { | |
1518 | printk(KERN_WARNING "%s: Can't set default compression.\n", | |
1519 | name); | |
1520 | if (modes_defined) { | |
1521 | retval = (-EINVAL); | |
1522 | goto out; | |
1523 | } | |
1524 | } | |
1525 | } | |
1526 | } | |
1527 | ||
1528 | STbp = STp->buffer; | |
1529 | i = write_behind_check(STp); | |
1530 | if (i) { | |
1531 | if (i == -ENOSPC) | |
1532 | STps->eof = ST_EOM_OK; | |
1533 | else | |
1534 | STps->eof = ST_EOM_ERROR; | |
1535 | } | |
1536 | ||
1537 | if (STps->eof == ST_EOM_OK) { | |
1538 | STps->eof = ST_EOD_1; /* allow next write */ | |
1539 | retval = (-ENOSPC); | |
1540 | goto out; | |
1541 | } | |
1542 | else if (STps->eof == ST_EOM_ERROR) { | |
1543 | retval = (-EIO); | |
1544 | goto out; | |
1545 | } | |
1546 | ||
1547 | /* Check the buffer readability in cases where copy_user might catch | |
1548 | the problems after some tape movement. */ | |
1549 | if (STp->block_size != 0 && | |
1550 | !STbp->do_dio && | |
1551 | (copy_from_user(&i, buf, 1) != 0 || | |
1552 | copy_from_user(&i, buf + count - 1, 1) != 0)) { | |
1553 | retval = (-EFAULT); | |
1554 | goto out; | |
1555 | } | |
1556 | ||
1557 | retval = setup_buffering(STp, buf, count, 0); | |
1558 | if (retval) | |
1559 | goto out; | |
1560 | ||
1561 | total = count; | |
1562 | ||
1563 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1564 | cmd[0] = WRITE_6; | |
1565 | cmd[1] = (STp->block_size != 0); | |
1566 | ||
1567 | STps->rw = ST_WRITING; | |
1568 | ||
1569 | b_point = buf; | |
1570 | while (count > 0 && !retry_eot) { | |
1571 | ||
1572 | if (STbp->do_dio) { | |
1573 | do_count = count; | |
1574 | } | |
1575 | else { | |
1576 | if (STp->block_size == 0) | |
1577 | do_count = count; | |
1578 | else { | |
1579 | do_count = STbp->buffer_blocks * STp->block_size - | |
1580 | STbp->buffer_bytes; | |
1581 | if (do_count > count) | |
1582 | do_count = count; | |
1583 | } | |
1584 | ||
1585 | i = append_to_buffer(b_point, STbp, do_count); | |
1586 | if (i) { | |
1587 | retval = i; | |
1588 | goto out; | |
1589 | } | |
1590 | } | |
1591 | count -= do_count; | |
1592 | b_point += do_count; | |
1593 | ||
1594 | async_write = STp->block_size == 0 && !STbp->do_dio && | |
1595 | STm->do_async_writes && STps->eof < ST_EOM_OK; | |
1596 | ||
1597 | if (STp->block_size != 0 && STm->do_buffer_writes && | |
1598 | !(STp->try_dio && try_wdio) && STps->eof < ST_EOM_OK && | |
1599 | STbp->buffer_bytes < STbp->buffer_size) { | |
1600 | STp->dirty = 1; | |
1601 | /* Don't write a buffer that is not full enough. */ | |
1602 | if (!async_write && count == 0) | |
1603 | break; | |
1604 | } | |
1605 | ||
1606 | retry_write: | |
1607 | if (STp->block_size == 0) | |
1608 | blks = transfer = do_count; | |
1609 | else { | |
1610 | if (!STbp->do_dio) | |
1611 | blks = STbp->buffer_bytes; | |
1612 | else | |
1613 | blks = do_count; | |
1614 | blks /= STp->block_size; | |
1615 | transfer = blks * STp->block_size; | |
1616 | } | |
1617 | cmd[2] = blks >> 16; | |
1618 | cmd[3] = blks >> 8; | |
1619 | cmd[4] = blks; | |
1620 | ||
1621 | SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE, | |
1622 | STp->device->timeout, MAX_WRITE_RETRIES, !async_write); | |
1623 | if (!SRpnt) { | |
1624 | retval = STbp->syscall_result; | |
1625 | goto out; | |
1626 | } | |
1627 | if (async_write) { | |
1628 | STbp->writing = transfer; | |
1629 | STp->dirty = !(STbp->writing == | |
1630 | STbp->buffer_bytes); | |
1631 | SRpnt = NULL; /* Prevent releasing this request! */ | |
1632 | DEB( STp->write_pending = 1; ) | |
1633 | break; | |
1634 | } | |
1635 | ||
1636 | if (STbp->syscall_result != 0) { | |
1637 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1638 | ||
1639 | DEBC(printk(ST_DEB_MSG "%s: Error on write:\n", name)); | |
1640 | if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) { | |
1641 | scode = cmdstatp->sense_hdr.sense_key; | |
1642 | if (cmdstatp->remainder_valid) | |
1643 | undone = (int)cmdstatp->uremainder64; | |
1644 | else if (STp->block_size == 0 && | |
1645 | scode == VOLUME_OVERFLOW) | |
1646 | undone = transfer; | |
1647 | else | |
1648 | undone = 0; | |
1649 | if (STp->block_size != 0) | |
1650 | undone *= STp->block_size; | |
1651 | if (undone <= do_count) { | |
1652 | /* Only data from this write is not written */ | |
1653 | count += undone; | |
1654 | do_count -= undone; | |
1655 | if (STp->block_size) | |
1656 | blks = (transfer - undone) / STp->block_size; | |
1657 | STps->eof = ST_EOM_OK; | |
1658 | /* Continue in fixed block mode if all written | |
1659 | in this request but still something left to write | |
1660 | (retval left to zero) | |
1661 | */ | |
1662 | if (STp->block_size == 0 || | |
1663 | undone > 0 || count == 0) | |
1664 | retval = (-ENOSPC); /* EOM within current request */ | |
1665 | DEBC(printk(ST_DEB_MSG | |
1666 | "%s: EOM with %d bytes unwritten.\n", | |
1667 | name, (int)count)); | |
1668 | } else { | |
1669 | /* EOT within data buffered earlier (possible only | |
1670 | in fixed block mode without direct i/o) */ | |
1671 | if (!retry_eot && !cmdstatp->deferred && | |
1672 | (scode == NO_SENSE || scode == RECOVERED_ERROR)) { | |
1673 | move_buffer_data(STp->buffer, transfer - undone); | |
1674 | retry_eot = 1; | |
1675 | if (STps->drv_block >= 0) { | |
1676 | STps->drv_block += (transfer - undone) / | |
1677 | STp->block_size; | |
1678 | } | |
1679 | STps->eof = ST_EOM_OK; | |
1680 | DEBC(printk(ST_DEB_MSG | |
1681 | "%s: Retry write of %d bytes at EOM.\n", | |
1682 | name, STp->buffer->buffer_bytes)); | |
1683 | goto retry_write; | |
1684 | } | |
1685 | else { | |
1686 | /* Either error within data buffered by driver or | |
1687 | failed retry */ | |
1688 | count -= do_count; | |
1689 | blks = do_count = 0; | |
1690 | STps->eof = ST_EOM_ERROR; | |
1691 | STps->drv_block = (-1); /* Too cautious? */ | |
1692 | retval = (-EIO); /* EOM for old data */ | |
1693 | DEBC(printk(ST_DEB_MSG | |
1694 | "%s: EOM with lost data.\n", | |
1695 | name)); | |
1696 | } | |
1697 | } | |
1698 | } else { | |
1699 | count += do_count; | |
1700 | STps->drv_block = (-1); /* Too cautious? */ | |
1701 | retval = (-EIO); | |
1702 | } | |
1703 | ||
1704 | } | |
1705 | ||
1706 | if (STps->drv_block >= 0) { | |
1707 | if (STp->block_size == 0) | |
1708 | STps->drv_block += (do_count > 0); | |
1709 | else | |
1710 | STps->drv_block += blks; | |
1711 | } | |
1712 | ||
1713 | STbp->buffer_bytes = 0; | |
1714 | STp->dirty = 0; | |
1715 | ||
1716 | if (retval || retry_eot) { | |
1717 | if (count < total) | |
1718 | retval = total - count; | |
1719 | goto out; | |
1720 | } | |
1721 | } | |
1722 | ||
1723 | if (STps->eof == ST_EOD_1) | |
1724 | STps->eof = ST_EOM_OK; | |
1725 | else if (STps->eof != ST_EOM_OK) | |
1726 | STps->eof = ST_NOEOF; | |
1727 | retval = total - count; | |
1728 | ||
1729 | out: | |
1730 | if (SRpnt != NULL) | |
1731 | scsi_release_request(SRpnt); | |
1732 | release_buffering(STp); | |
1733 | up(&STp->lock); | |
1734 | ||
1735 | return retval; | |
1736 | } | |
1737 | \f | |
1738 | /* Read data from the tape. Returns zero in the normal case, one if the | |
1739 | eof status has changed, and the negative error code in case of a | |
1740 | fatal error. Otherwise updates the buffer and the eof state. | |
1741 | ||
1742 | Does release user buffer mapping if it is set. | |
1743 | */ | |
1744 | static long read_tape(struct scsi_tape *STp, long count, | |
1745 | struct scsi_request ** aSRpnt) | |
1746 | { | |
1747 | int transfer, blks, bytes; | |
1748 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
1749 | struct scsi_request *SRpnt; | |
1750 | struct st_modedef *STm; | |
1751 | struct st_partstat *STps; | |
1752 | struct st_buffer *STbp; | |
1753 | int retval = 0; | |
1754 | char *name = tape_name(STp); | |
1755 | ||
1756 | if (count == 0) | |
1757 | return 0; | |
1758 | ||
1759 | STm = &(STp->modes[STp->current_mode]); | |
1760 | STps = &(STp->ps[STp->partition]); | |
1761 | if (STps->eof == ST_FM_HIT) | |
1762 | return 1; | |
1763 | STbp = STp->buffer; | |
1764 | ||
1765 | if (STp->block_size == 0) | |
1766 | blks = bytes = count; | |
1767 | else { | |
1768 | if (!(STp->try_dio && try_rdio) && STm->do_read_ahead) { | |
1769 | blks = (STp->buffer)->buffer_blocks; | |
1770 | bytes = blks * STp->block_size; | |
1771 | } else { | |
1772 | bytes = count; | |
1773 | if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size) | |
1774 | bytes = (STp->buffer)->buffer_size; | |
1775 | blks = bytes / STp->block_size; | |
1776 | bytes = blks * STp->block_size; | |
1777 | } | |
1778 | } | |
1779 | ||
1780 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1781 | cmd[0] = READ_6; | |
1782 | cmd[1] = (STp->block_size != 0); | |
1783 | cmd[2] = blks >> 16; | |
1784 | cmd[3] = blks >> 8; | |
1785 | cmd[4] = blks; | |
1786 | ||
1787 | SRpnt = *aSRpnt; | |
1788 | SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE, | |
1789 | STp->device->timeout, MAX_RETRIES, 1); | |
1790 | release_buffering(STp); | |
1791 | *aSRpnt = SRpnt; | |
1792 | if (!SRpnt) | |
1793 | return STbp->syscall_result; | |
1794 | ||
1795 | STbp->read_pointer = 0; | |
1796 | STps->at_sm = 0; | |
1797 | ||
1798 | /* Something to check */ | |
1799 | if (STbp->syscall_result) { | |
1800 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1801 | ||
1802 | retval = 1; | |
1803 | DEBC(printk(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", | |
1804 | name, | |
1805 | SRpnt->sr_sense_buffer[0], SRpnt->sr_sense_buffer[1], | |
1806 | SRpnt->sr_sense_buffer[2], SRpnt->sr_sense_buffer[3], | |
1807 | SRpnt->sr_sense_buffer[4], SRpnt->sr_sense_buffer[5], | |
1808 | SRpnt->sr_sense_buffer[6], SRpnt->sr_sense_buffer[7])); | |
1809 | if (cmdstatp->have_sense) { | |
1810 | ||
1811 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) | |
1812 | cmdstatp->flags &= 0xcf; /* No need for EOM in this case */ | |
1813 | ||
1814 | if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */ | |
1815 | /* Compute the residual count */ | |
1816 | if (cmdstatp->remainder_valid) | |
1817 | transfer = (int)cmdstatp->uremainder64; | |
1818 | else | |
1819 | transfer = 0; | |
1820 | if (STp->block_size == 0 && | |
1821 | cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) | |
1822 | transfer = bytes; | |
1823 | ||
1824 | if (cmdstatp->flags & SENSE_ILI) { /* ILI */ | |
1825 | if (STp->block_size == 0) { | |
1826 | if (transfer <= 0) { | |
1827 | if (transfer < 0) | |
1828 | printk(KERN_NOTICE | |
1829 | "%s: Failed to read %d byte block with %d byte transfer.\n", | |
1830 | name, bytes - transfer, bytes); | |
1831 | if (STps->drv_block >= 0) | |
1832 | STps->drv_block += 1; | |
1833 | STbp->buffer_bytes = 0; | |
1834 | return (-ENOMEM); | |
1835 | } | |
1836 | STbp->buffer_bytes = bytes - transfer; | |
1837 | } else { | |
1838 | scsi_release_request(SRpnt); | |
1839 | SRpnt = *aSRpnt = NULL; | |
1840 | if (transfer == blks) { /* We did not get anything, error */ | |
1841 | printk(KERN_NOTICE "%s: Incorrect block size.\n", name); | |
1842 | if (STps->drv_block >= 0) | |
1843 | STps->drv_block += blks - transfer + 1; | |
1844 | st_int_ioctl(STp, MTBSR, 1); | |
1845 | return (-EIO); | |
1846 | } | |
1847 | /* We have some data, deliver it */ | |
1848 | STbp->buffer_bytes = (blks - transfer) * | |
1849 | STp->block_size; | |
1850 | DEBC(printk(ST_DEB_MSG | |
1851 | "%s: ILI but enough data received %ld %d.\n", | |
1852 | name, count, STbp->buffer_bytes)); | |
1853 | if (STps->drv_block >= 0) | |
1854 | STps->drv_block += 1; | |
1855 | if (st_int_ioctl(STp, MTBSR, 1)) | |
1856 | return (-EIO); | |
1857 | } | |
1858 | } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */ | |
1859 | if (STps->eof != ST_FM_HIT) | |
1860 | STps->eof = ST_FM_HIT; | |
1861 | else | |
1862 | STps->eof = ST_EOD_2; | |
1863 | if (STp->block_size == 0) | |
1864 | STbp->buffer_bytes = 0; | |
1865 | else | |
1866 | STbp->buffer_bytes = | |
1867 | bytes - transfer * STp->block_size; | |
1868 | DEBC(printk(ST_DEB_MSG | |
1869 | "%s: EOF detected (%d bytes read).\n", | |
1870 | name, STbp->buffer_bytes)); | |
1871 | } else if (cmdstatp->flags & SENSE_EOM) { | |
1872 | if (STps->eof == ST_FM) | |
1873 | STps->eof = ST_EOD_1; | |
1874 | else | |
1875 | STps->eof = ST_EOM_OK; | |
1876 | if (STp->block_size == 0) | |
1877 | STbp->buffer_bytes = bytes - transfer; | |
1878 | else | |
1879 | STbp->buffer_bytes = | |
1880 | bytes - transfer * STp->block_size; | |
1881 | ||
1882 | DEBC(printk(ST_DEB_MSG "%s: EOM detected (%d bytes read).\n", | |
1883 | name, STbp->buffer_bytes)); | |
1884 | } | |
1885 | } | |
1886 | /* end of EOF, EOM, ILI test */ | |
1887 | else { /* nonzero sense key */ | |
1888 | DEBC(printk(ST_DEB_MSG | |
1889 | "%s: Tape error while reading.\n", name)); | |
1890 | STps->drv_block = (-1); | |
1891 | if (STps->eof == ST_FM && | |
1892 | cmdstatp->sense_hdr.sense_key == BLANK_CHECK) { | |
1893 | DEBC(printk(ST_DEB_MSG | |
1894 | "%s: Zero returned for first BLANK CHECK after EOF.\n", | |
1895 | name)); | |
1896 | STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */ | |
1897 | } else /* Some other extended sense code */ | |
1898 | retval = (-EIO); | |
1899 | } | |
1900 | ||
1901 | if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */ | |
1902 | STbp->buffer_bytes = 0; | |
1903 | } | |
1904 | /* End of extended sense test */ | |
1905 | else { /* Non-extended sense */ | |
1906 | retval = STbp->syscall_result; | |
1907 | } | |
1908 | ||
1909 | } | |
1910 | /* End of error handling */ | |
1911 | else /* Read successful */ | |
1912 | STbp->buffer_bytes = bytes; | |
1913 | ||
1914 | if (STps->drv_block >= 0) { | |
1915 | if (STp->block_size == 0) | |
1916 | STps->drv_block++; | |
1917 | else | |
1918 | STps->drv_block += STbp->buffer_bytes / STp->block_size; | |
1919 | } | |
1920 | return retval; | |
1921 | } | |
1922 | \f | |
1923 | ||
1924 | /* Read command */ | |
1925 | static ssize_t | |
1926 | st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
1927 | { | |
1928 | ssize_t total; | |
1929 | ssize_t retval = 0; | |
1930 | ssize_t i, transfer; | |
1931 | int special, do_dio = 0; | |
1932 | struct scsi_request *SRpnt = NULL; | |
1933 | struct scsi_tape *STp = filp->private_data; | |
1934 | struct st_modedef *STm; | |
1935 | struct st_partstat *STps; | |
1936 | struct st_buffer *STbp = STp->buffer; | |
1937 | DEB( char *name = tape_name(STp); ) | |
1938 | ||
1939 | if (down_interruptible(&STp->lock)) | |
1940 | return -ERESTARTSYS; | |
1941 | ||
1942 | retval = rw_checks(STp, filp, count); | |
1943 | if (retval || count == 0) | |
1944 | goto out; | |
1945 | ||
1946 | STm = &(STp->modes[STp->current_mode]); | |
1947 | if (!(STm->do_read_ahead) && STp->block_size != 0 && | |
1948 | (count % STp->block_size) != 0) { | |
1949 | retval = (-EINVAL); /* Read must be integral number of blocks */ | |
1950 | goto out; | |
1951 | } | |
1952 | ||
1953 | STps = &(STp->ps[STp->partition]); | |
1954 | if (STps->rw == ST_WRITING) { | |
1955 | retval = flush_buffer(STp, 0); | |
1956 | if (retval) | |
1957 | goto out; | |
1958 | STps->rw = ST_READING; | |
1959 | } | |
1960 | DEB( | |
1961 | if (debugging && STps->eof != ST_NOEOF) | |
1962 | printk(ST_DEB_MSG "%s: EOF/EOM flag up (%d). Bytes %d\n", name, | |
1963 | STps->eof, STbp->buffer_bytes); | |
1964 | ) /* end DEB */ | |
1965 | ||
1966 | retval = setup_buffering(STp, buf, count, 1); | |
1967 | if (retval) | |
1968 | goto out; | |
1969 | do_dio = STbp->do_dio; | |
1970 | ||
1971 | if (STbp->buffer_bytes == 0 && | |
1972 | STps->eof >= ST_EOD_1) { | |
1973 | if (STps->eof < ST_EOD) { | |
1974 | STps->eof += 1; | |
1975 | retval = 0; | |
1976 | goto out; | |
1977 | } | |
1978 | retval = (-EIO); /* EOM or Blank Check */ | |
1979 | goto out; | |
1980 | } | |
1981 | ||
1982 | if (do_dio) { | |
1983 | /* Check the buffer writability before any tape movement. Don't alter | |
1984 | buffer data. */ | |
1985 | if (copy_from_user(&i, buf, 1) != 0 || | |
1986 | copy_to_user(buf, &i, 1) != 0 || | |
1987 | copy_from_user(&i, buf + count - 1, 1) != 0 || | |
1988 | copy_to_user(buf + count - 1, &i, 1) != 0) { | |
1989 | retval = (-EFAULT); | |
1990 | goto out; | |
1991 | } | |
1992 | } | |
1993 | ||
1994 | STps->rw = ST_READING; | |
1995 | ||
1996 | ||
1997 | /* Loop until enough data in buffer or a special condition found */ | |
1998 | for (total = 0, special = 0; total < count && !special;) { | |
1999 | ||
2000 | /* Get new data if the buffer is empty */ | |
2001 | if (STbp->buffer_bytes == 0) { | |
2002 | special = read_tape(STp, count - total, &SRpnt); | |
2003 | if (special < 0) { /* No need to continue read */ | |
2004 | retval = special; | |
2005 | goto out; | |
2006 | } | |
2007 | } | |
2008 | ||
2009 | /* Move the data from driver buffer to user buffer */ | |
2010 | if (STbp->buffer_bytes > 0) { | |
2011 | DEB( | |
2012 | if (debugging && STps->eof != ST_NOEOF) | |
2013 | printk(ST_DEB_MSG | |
2014 | "%s: EOF up (%d). Left %d, needed %d.\n", name, | |
2015 | STps->eof, STbp->buffer_bytes, | |
2016 | (int)(count - total)); | |
2017 | ) /* end DEB */ | |
2018 | transfer = STbp->buffer_bytes < count - total ? | |
2019 | STbp->buffer_bytes : count - total; | |
2020 | if (!do_dio) { | |
2021 | i = from_buffer(STbp, buf, transfer); | |
2022 | if (i) { | |
2023 | retval = i; | |
2024 | goto out; | |
2025 | } | |
2026 | } | |
2027 | buf += transfer; | |
2028 | total += transfer; | |
2029 | } | |
2030 | ||
2031 | if (STp->block_size == 0) | |
2032 | break; /* Read only one variable length block */ | |
2033 | ||
2034 | } /* for (total = 0, special = 0; | |
2035 | total < count && !special; ) */ | |
2036 | ||
2037 | /* Change the eof state if no data from tape or buffer */ | |
2038 | if (total == 0) { | |
2039 | if (STps->eof == ST_FM_HIT) { | |
2040 | STps->eof = ST_FM; | |
2041 | STps->drv_block = 0; | |
2042 | if (STps->drv_file >= 0) | |
2043 | STps->drv_file++; | |
2044 | } else if (STps->eof == ST_EOD_1) { | |
2045 | STps->eof = ST_EOD_2; | |
2046 | STps->drv_block = 0; | |
2047 | if (STps->drv_file >= 0) | |
2048 | STps->drv_file++; | |
2049 | } else if (STps->eof == ST_EOD_2) | |
2050 | STps->eof = ST_EOD; | |
2051 | } else if (STps->eof == ST_FM) | |
2052 | STps->eof = ST_NOEOF; | |
2053 | retval = total; | |
2054 | ||
2055 | out: | |
2056 | if (SRpnt != NULL) { | |
2057 | scsi_release_request(SRpnt); | |
2058 | SRpnt = NULL; | |
2059 | } | |
2060 | if (do_dio) { | |
2061 | release_buffering(STp); | |
2062 | STbp->buffer_bytes = 0; | |
2063 | } | |
2064 | up(&STp->lock); | |
2065 | ||
2066 | return retval; | |
2067 | } | |
2068 | \f | |
2069 | ||
2070 | ||
2071 | DEB( | |
2072 | /* Set the driver options */ | |
2073 | static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm, char *name) | |
2074 | { | |
2075 | if (debugging) { | |
2076 | printk(KERN_INFO | |
2077 | "%s: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n", | |
2078 | name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes, | |
2079 | STm->do_read_ahead); | |
2080 | printk(KERN_INFO | |
2081 | "%s: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n", | |
2082 | name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock); | |
2083 | printk(KERN_INFO | |
2084 | "%s: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n", | |
2085 | name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions, | |
2086 | STp->scsi2_logical); | |
2087 | printk(KERN_INFO | |
2088 | "%s: sysv: %d nowait: %d\n", name, STm->sysv, STp->immediate); | |
2089 | printk(KERN_INFO "%s: debugging: %d\n", | |
2090 | name, debugging); | |
2091 | } | |
2092 | } | |
2093 | ) | |
2094 | ||
2095 | ||
2096 | static int st_set_options(struct scsi_tape *STp, long options) | |
2097 | { | |
2098 | int value; | |
2099 | long code; | |
2100 | struct st_modedef *STm; | |
2101 | char *name = tape_name(STp); | |
2102 | struct cdev *cd0, *cd1; | |
2103 | ||
2104 | STm = &(STp->modes[STp->current_mode]); | |
2105 | if (!STm->defined) { | |
2106 | cd0 = STm->cdevs[0]; cd1 = STm->cdevs[1]; | |
2107 | memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); | |
2108 | STm->cdevs[0] = cd0; STm->cdevs[1] = cd1; | |
2109 | modes_defined = 1; | |
2110 | DEBC(printk(ST_DEB_MSG | |
2111 | "%s: Initialized mode %d definition from mode 0\n", | |
2112 | name, STp->current_mode)); | |
2113 | } | |
2114 | ||
2115 | code = options & MT_ST_OPTIONS; | |
2116 | if (code == MT_ST_BOOLEANS) { | |
2117 | STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; | |
2118 | STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; | |
2119 | STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; | |
2120 | STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; | |
2121 | STp->two_fm = (options & MT_ST_TWO_FM) != 0; | |
2122 | STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; | |
2123 | STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; | |
2124 | STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; | |
2125 | STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; | |
2126 | if ((STp->device)->scsi_level >= SCSI_2) | |
2127 | STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; | |
2128 | STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; | |
2129 | STp->immediate = (options & MT_ST_NOWAIT) != 0; | |
2130 | STm->sysv = (options & MT_ST_SYSV) != 0; | |
2131 | DEB( debugging = (options & MT_ST_DEBUGGING) != 0; | |
2132 | st_log_options(STp, STm, name); ) | |
2133 | } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { | |
2134 | value = (code == MT_ST_SETBOOLEANS); | |
2135 | if ((options & MT_ST_BUFFER_WRITES) != 0) | |
2136 | STm->do_buffer_writes = value; | |
2137 | if ((options & MT_ST_ASYNC_WRITES) != 0) | |
2138 | STm->do_async_writes = value; | |
2139 | if ((options & MT_ST_DEF_WRITES) != 0) | |
2140 | STm->defaults_for_writes = value; | |
2141 | if ((options & MT_ST_READ_AHEAD) != 0) | |
2142 | STm->do_read_ahead = value; | |
2143 | if ((options & MT_ST_TWO_FM) != 0) | |
2144 | STp->two_fm = value; | |
2145 | if ((options & MT_ST_FAST_MTEOM) != 0) | |
2146 | STp->fast_mteom = value; | |
2147 | if ((options & MT_ST_AUTO_LOCK) != 0) | |
2148 | STp->do_auto_lock = value; | |
2149 | if ((options & MT_ST_CAN_BSR) != 0) | |
2150 | STp->can_bsr = value; | |
2151 | if ((options & MT_ST_NO_BLKLIMS) != 0) | |
2152 | STp->omit_blklims = value; | |
2153 | if ((STp->device)->scsi_level >= SCSI_2 && | |
2154 | (options & MT_ST_CAN_PARTITIONS) != 0) | |
2155 | STp->can_partitions = value; | |
2156 | if ((options & MT_ST_SCSI2LOGICAL) != 0) | |
2157 | STp->scsi2_logical = value; | |
2158 | if ((options & MT_ST_NOWAIT) != 0) | |
2159 | STp->immediate = value; | |
2160 | if ((options & MT_ST_SYSV) != 0) | |
2161 | STm->sysv = value; | |
2162 | DEB( | |
2163 | if ((options & MT_ST_DEBUGGING) != 0) | |
2164 | debugging = value; | |
2165 | st_log_options(STp, STm, name); ) | |
2166 | } else if (code == MT_ST_WRITE_THRESHOLD) { | |
2167 | /* Retained for compatibility */ | |
2168 | } else if (code == MT_ST_DEF_BLKSIZE) { | |
2169 | value = (options & ~MT_ST_OPTIONS); | |
2170 | if (value == ~MT_ST_OPTIONS) { | |
2171 | STm->default_blksize = (-1); | |
2172 | DEBC( printk(KERN_INFO "%s: Default block size disabled.\n", name)); | |
2173 | } else { | |
2174 | STm->default_blksize = value; | |
2175 | DEBC( printk(KERN_INFO "%s: Default block size set to %d bytes.\n", | |
2176 | name, STm->default_blksize)); | |
2177 | if (STp->ready == ST_READY) { | |
2178 | STp->blksize_changed = 0; | |
2179 | set_mode_densblk(STp, STm); | |
2180 | } | |
2181 | } | |
2182 | } else if (code == MT_ST_TIMEOUTS) { | |
2183 | value = (options & ~MT_ST_OPTIONS); | |
2184 | if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { | |
2185 | STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; | |
2186 | DEBC( printk(KERN_INFO "%s: Long timeout set to %d seconds.\n", name, | |
2187 | (value & ~MT_ST_SET_LONG_TIMEOUT))); | |
2188 | } else { | |
2189 | STp->device->timeout = value * HZ; | |
2190 | DEBC( printk(KERN_INFO "%s: Normal timeout set to %d seconds.\n", | |
2191 | name, value) ); | |
2192 | } | |
2193 | } else if (code == MT_ST_SET_CLN) { | |
2194 | value = (options & ~MT_ST_OPTIONS) & 0xff; | |
2195 | if (value != 0 && | |
2196 | value < EXTENDED_SENSE_START && value >= SCSI_SENSE_BUFFERSIZE) | |
2197 | return (-EINVAL); | |
2198 | STp->cln_mode = value; | |
2199 | STp->cln_sense_mask = (options >> 8) & 0xff; | |
2200 | STp->cln_sense_value = (options >> 16) & 0xff; | |
2201 | printk(KERN_INFO | |
2202 | "%s: Cleaning request mode %d, mask %02x, value %02x\n", | |
2203 | name, value, STp->cln_sense_mask, STp->cln_sense_value); | |
2204 | } else if (code == MT_ST_DEF_OPTIONS) { | |
2205 | code = (options & ~MT_ST_CLEAR_DEFAULT); | |
2206 | value = (options & MT_ST_CLEAR_DEFAULT); | |
2207 | if (code == MT_ST_DEF_DENSITY) { | |
2208 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2209 | STm->default_density = (-1); | |
2210 | DEBC( printk(KERN_INFO "%s: Density default disabled.\n", | |
2211 | name)); | |
2212 | } else { | |
2213 | STm->default_density = value & 0xff; | |
2214 | DEBC( printk(KERN_INFO "%s: Density default set to %x\n", | |
2215 | name, STm->default_density)); | |
2216 | if (STp->ready == ST_READY) { | |
2217 | STp->density_changed = 0; | |
2218 | set_mode_densblk(STp, STm); | |
2219 | } | |
2220 | } | |
2221 | } else if (code == MT_ST_DEF_DRVBUFFER) { | |
2222 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2223 | STp->default_drvbuffer = 0xff; | |
2224 | DEBC( printk(KERN_INFO | |
2225 | "%s: Drive buffer default disabled.\n", name)); | |
2226 | } else { | |
2227 | STp->default_drvbuffer = value & 7; | |
2228 | DEBC( printk(KERN_INFO | |
2229 | "%s: Drive buffer default set to %x\n", | |
2230 | name, STp->default_drvbuffer)); | |
2231 | if (STp->ready == ST_READY) | |
2232 | st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer); | |
2233 | } | |
2234 | } else if (code == MT_ST_DEF_COMPRESSION) { | |
2235 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2236 | STm->default_compression = ST_DONT_TOUCH; | |
2237 | DEBC( printk(KERN_INFO | |
2238 | "%s: Compression default disabled.\n", name)); | |
2239 | } else { | |
2240 | if ((value & 0xff00) != 0) { | |
2241 | STp->c_algo = (value & 0xff00) >> 8; | |
2242 | DEBC( printk(KERN_INFO "%s: Compression algorithm set to 0x%x.\n", | |
2243 | name, STp->c_algo)); | |
2244 | } | |
2245 | if ((value & 0xff) != 0xff) { | |
2246 | STm->default_compression = (value & 1 ? ST_YES : ST_NO); | |
2247 | DEBC( printk(KERN_INFO "%s: Compression default set to %x\n", | |
2248 | name, (value & 1))); | |
2249 | if (STp->ready == ST_READY) { | |
2250 | STp->compression_changed = 0; | |
2251 | st_compression(STp, (STm->default_compression == ST_YES)); | |
2252 | } | |
2253 | } | |
2254 | } | |
2255 | } | |
2256 | } else | |
2257 | return (-EIO); | |
2258 | ||
2259 | return 0; | |
2260 | } | |
2261 | \f | |
2262 | #define MODE_HEADER_LENGTH 4 | |
2263 | ||
2264 | /* Mode header and page byte offsets */ | |
2265 | #define MH_OFF_DATA_LENGTH 0 | |
2266 | #define MH_OFF_MEDIUM_TYPE 1 | |
2267 | #define MH_OFF_DEV_SPECIFIC 2 | |
2268 | #define MH_OFF_BDESCS_LENGTH 3 | |
2269 | #define MP_OFF_PAGE_NBR 0 | |
2270 | #define MP_OFF_PAGE_LENGTH 1 | |
2271 | ||
2272 | /* Mode header and page bit masks */ | |
2273 | #define MH_BIT_WP 0x80 | |
2274 | #define MP_MSK_PAGE_NBR 0x3f | |
2275 | ||
2276 | /* Don't return block descriptors */ | |
2277 | #define MODE_SENSE_OMIT_BDESCS 0x08 | |
2278 | ||
2279 | #define MODE_SELECT_PAGE_FORMAT 0x10 | |
2280 | ||
2281 | /* Read a mode page into the tape buffer. The block descriptors are included | |
2282 | if incl_block_descs is true. The page control is ored to the page number | |
2283 | parameter, if necessary. */ | |
2284 | static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) | |
2285 | { | |
2286 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
2287 | struct scsi_request *SRpnt = NULL; | |
2288 | ||
2289 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2290 | cmd[0] = MODE_SENSE; | |
2291 | if (omit_block_descs) | |
2292 | cmd[1] = MODE_SENSE_OMIT_BDESCS; | |
2293 | cmd[2] = page; | |
2294 | cmd[4] = 255; | |
2295 | ||
2296 | SRpnt = st_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_FROM_DEVICE, | |
2297 | STp->device->timeout, 0, 1); | |
2298 | if (SRpnt == NULL) | |
2299 | return (STp->buffer)->syscall_result; | |
2300 | ||
2301 | scsi_release_request(SRpnt); | |
2302 | ||
2303 | return (STp->buffer)->syscall_result; | |
2304 | } | |
2305 | ||
2306 | ||
2307 | /* Send the mode page in the tape buffer to the drive. Assumes that the mode data | |
2308 | in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ | |
2309 | static int write_mode_page(struct scsi_tape *STp, int page, int slow) | |
2310 | { | |
2311 | int pgo; | |
2312 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
2313 | struct scsi_request *SRpnt = NULL; | |
2314 | ||
2315 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2316 | cmd[0] = MODE_SELECT; | |
2317 | cmd[1] = MODE_SELECT_PAGE_FORMAT; | |
2318 | pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH]; | |
2319 | cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2; | |
2320 | ||
2321 | /* Clear reserved fields */ | |
2322 | (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0; | |
2323 | (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0; | |
2324 | (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; | |
2325 | (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; | |
2326 | ||
2327 | SRpnt = st_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_TO_DEVICE, | |
2328 | (slow ? STp->long_timeout : STp->device->timeout), 0, 1); | |
2329 | if (SRpnt == NULL) | |
2330 | return (STp->buffer)->syscall_result; | |
2331 | ||
2332 | scsi_release_request(SRpnt); | |
2333 | ||
2334 | return (STp->buffer)->syscall_result; | |
2335 | } | |
2336 | ||
2337 | ||
2338 | #define COMPRESSION_PAGE 0x0f | |
2339 | #define COMPRESSION_PAGE_LENGTH 16 | |
2340 | ||
2341 | #define CP_OFF_DCE_DCC 2 | |
2342 | #define CP_OFF_C_ALGO 7 | |
2343 | ||
2344 | #define DCE_MASK 0x80 | |
2345 | #define DCC_MASK 0x40 | |
2346 | #define RED_MASK 0x60 | |
2347 | ||
2348 | ||
2349 | /* Control the compression with mode page 15. Algorithm not changed if zero. | |
2350 | ||
2351 | The block descriptors are read and written because Sony SDT-7000 does not | |
2352 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). | |
2353 | Including block descriptors should not cause any harm to other drives. */ | |
2354 | ||
2355 | static int st_compression(struct scsi_tape * STp, int state) | |
2356 | { | |
2357 | int retval; | |
2358 | int mpoffs; /* Offset to mode page start */ | |
2359 | unsigned char *b_data = (STp->buffer)->b_data; | |
2360 | DEB( char *name = tape_name(STp); ) | |
2361 | ||
2362 | if (STp->ready != ST_READY) | |
2363 | return (-EIO); | |
2364 | ||
2365 | /* Read the current page contents */ | |
2366 | retval = read_mode_page(STp, COMPRESSION_PAGE, 0); | |
2367 | if (retval) { | |
2368 | DEBC(printk(ST_DEB_MSG "%s: Compression mode page not supported.\n", | |
2369 | name)); | |
2370 | return (-EIO); | |
2371 | } | |
2372 | ||
2373 | mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; | |
2374 | DEBC(printk(ST_DEB_MSG "%s: Compression state is %d.\n", name, | |
2375 | (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0))); | |
2376 | ||
2377 | /* Check if compression can be changed */ | |
2378 | if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) { | |
2379 | DEBC(printk(ST_DEB_MSG "%s: Compression not supported.\n", name)); | |
2380 | return (-EIO); | |
2381 | } | |
2382 | ||
2383 | /* Do the change */ | |
2384 | if (state) { | |
2385 | b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK; | |
2386 | if (STp->c_algo != 0) | |
2387 | b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo; | |
2388 | } | |
2389 | else { | |
2390 | b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK; | |
2391 | if (STp->c_algo != 0) | |
2392 | b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */ | |
2393 | } | |
2394 | ||
2395 | retval = write_mode_page(STp, COMPRESSION_PAGE, 0); | |
2396 | if (retval) { | |
2397 | DEBC(printk(ST_DEB_MSG "%s: Compression change failed.\n", name)); | |
2398 | return (-EIO); | |
2399 | } | |
2400 | DEBC(printk(ST_DEB_MSG "%s: Compression state changed to %d.\n", | |
2401 | name, state)); | |
2402 | ||
2403 | STp->compression_changed = 1; | |
2404 | return 0; | |
2405 | } | |
2406 | ||
2407 | ||
2408 | /* Process the load and unload commands (does unload if the load code is zero) */ | |
2409 | static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code) | |
2410 | { | |
2411 | int retval = (-EIO), timeout; | |
2412 | DEB( char *name = tape_name(STp); ) | |
2413 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
2414 | struct st_partstat *STps; | |
2415 | struct scsi_request *SRpnt; | |
2416 | ||
2417 | if (STp->ready != ST_READY && !load_code) { | |
2418 | if (STp->ready == ST_NO_TAPE) | |
2419 | return (-ENOMEDIUM); | |
2420 | else | |
2421 | return (-EIO); | |
2422 | } | |
2423 | ||
2424 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2425 | cmd[0] = START_STOP; | |
2426 | if (load_code) | |
2427 | cmd[4] |= 1; | |
2428 | /* | |
2429 | * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A | |
2430 | */ | |
2431 | if (load_code >= 1 + MT_ST_HPLOADER_OFFSET | |
2432 | && load_code <= 6 + MT_ST_HPLOADER_OFFSET) { | |
2433 | DEBC(printk(ST_DEB_MSG "%s: Enhanced %sload slot %2d.\n", | |
2434 | name, (cmd[4]) ? "" : "un", | |
2435 | load_code - MT_ST_HPLOADER_OFFSET)); | |
2436 | cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ | |
2437 | } | |
2438 | if (STp->immediate) { | |
2439 | cmd[1] = 1; /* Don't wait for completion */ | |
2440 | timeout = STp->device->timeout; | |
2441 | } | |
2442 | else | |
2443 | timeout = STp->long_timeout; | |
2444 | ||
2445 | DEBC( | |
2446 | if (!load_code) | |
2447 | printk(ST_DEB_MSG "%s: Unloading tape.\n", name); | |
2448 | else | |
2449 | printk(ST_DEB_MSG "%s: Loading tape.\n", name); | |
2450 | ); | |
2451 | ||
2452 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, | |
2453 | timeout, MAX_RETRIES, 1); | |
2454 | if (!SRpnt) | |
2455 | return (STp->buffer)->syscall_result; | |
2456 | ||
2457 | retval = (STp->buffer)->syscall_result; | |
2458 | scsi_release_request(SRpnt); | |
2459 | ||
2460 | if (!retval) { /* SCSI command successful */ | |
2461 | ||
2462 | if (!load_code) { | |
2463 | STp->rew_at_close = 0; | |
2464 | STp->ready = ST_NO_TAPE; | |
2465 | } | |
2466 | else { | |
2467 | STp->rew_at_close = STp->autorew_dev; | |
2468 | retval = check_tape(STp, filp); | |
2469 | if (retval > 0) | |
2470 | retval = 0; | |
2471 | } | |
2472 | } | |
2473 | else { | |
2474 | STps = &(STp->ps[STp->partition]); | |
2475 | STps->drv_file = STps->drv_block = (-1); | |
2476 | } | |
2477 | ||
2478 | return retval; | |
2479 | } | |
2480 | \f | |
2481 | #if DEBUG | |
2482 | #define ST_DEB_FORWARD 0 | |
2483 | #define ST_DEB_BACKWARD 1 | |
2484 | static void deb_space_print(char *name, int direction, char *units, unsigned char *cmd) | |
2485 | { | |
2486 | s32 sc; | |
2487 | ||
2488 | sc = cmd[2] & 0x80 ? 0xff000000 : 0; | |
2489 | sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; | |
2490 | if (direction) | |
2491 | sc = -sc; | |
2492 | printk(ST_DEB_MSG "%s: Spacing tape %s over %d %s.\n", name, | |
2493 | direction ? "backward" : "forward", sc, units); | |
2494 | } | |
2495 | #endif | |
2496 | ||
2497 | ||
2498 | /* Internal ioctl function */ | |
2499 | static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) | |
2500 | { | |
2501 | int timeout; | |
2502 | long ltmp; | |
2503 | int ioctl_result; | |
2504 | int chg_eof = 1; | |
2505 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
2506 | struct scsi_request *SRpnt; | |
2507 | struct st_partstat *STps; | |
2508 | int fileno, blkno, at_sm, undone; | |
2509 | int datalen = 0, direction = DMA_NONE; | |
2510 | char *name = tape_name(STp); | |
2511 | ||
2512 | WARN_ON(STp->buffer->do_dio != 0); | |
2513 | if (STp->ready != ST_READY) { | |
2514 | if (STp->ready == ST_NO_TAPE) | |
2515 | return (-ENOMEDIUM); | |
2516 | else | |
2517 | return (-EIO); | |
2518 | } | |
2519 | timeout = STp->long_timeout; | |
2520 | STps = &(STp->ps[STp->partition]); | |
2521 | fileno = STps->drv_file; | |
2522 | blkno = STps->drv_block; | |
2523 | at_sm = STps->at_sm; | |
2524 | ||
2525 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2526 | switch (cmd_in) { | |
2527 | case MTFSFM: | |
2528 | chg_eof = 0; /* Changed from the FSF after this */ | |
2529 | case MTFSF: | |
2530 | cmd[0] = SPACE; | |
2531 | cmd[1] = 0x01; /* Space FileMarks */ | |
2532 | cmd[2] = (arg >> 16); | |
2533 | cmd[3] = (arg >> 8); | |
2534 | cmd[4] = arg; | |
2535 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "filemarks", cmd);) | |
2536 | if (fileno >= 0) | |
2537 | fileno += arg; | |
2538 | blkno = 0; | |
2539 | at_sm &= (arg == 0); | |
2540 | break; | |
2541 | case MTBSFM: | |
2542 | chg_eof = 0; /* Changed from the FSF after this */ | |
2543 | case MTBSF: | |
2544 | cmd[0] = SPACE; | |
2545 | cmd[1] = 0x01; /* Space FileMarks */ | |
2546 | ltmp = (-arg); | |
2547 | cmd[2] = (ltmp >> 16); | |
2548 | cmd[3] = (ltmp >> 8); | |
2549 | cmd[4] = ltmp; | |
2550 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "filemarks", cmd);) | |
2551 | if (fileno >= 0) | |
2552 | fileno -= arg; | |
2553 | blkno = (-1); /* We can't know the block number */ | |
2554 | at_sm &= (arg == 0); | |
2555 | break; | |
2556 | case MTFSR: | |
2557 | cmd[0] = SPACE; | |
2558 | cmd[1] = 0x00; /* Space Blocks */ | |
2559 | cmd[2] = (arg >> 16); | |
2560 | cmd[3] = (arg >> 8); | |
2561 | cmd[4] = arg; | |
2562 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "blocks", cmd);) | |
2563 | if (blkno >= 0) | |
2564 | blkno += arg; | |
2565 | at_sm &= (arg == 0); | |
2566 | break; | |
2567 | case MTBSR: | |
2568 | cmd[0] = SPACE; | |
2569 | cmd[1] = 0x00; /* Space Blocks */ | |
2570 | ltmp = (-arg); | |
2571 | cmd[2] = (ltmp >> 16); | |
2572 | cmd[3] = (ltmp >> 8); | |
2573 | cmd[4] = ltmp; | |
2574 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "blocks", cmd);) | |
2575 | if (blkno >= 0) | |
2576 | blkno -= arg; | |
2577 | at_sm &= (arg == 0); | |
2578 | break; | |
2579 | case MTFSS: | |
2580 | cmd[0] = SPACE; | |
2581 | cmd[1] = 0x04; /* Space Setmarks */ | |
2582 | cmd[2] = (arg >> 16); | |
2583 | cmd[3] = (arg >> 8); | |
2584 | cmd[4] = arg; | |
2585 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "setmarks", cmd);) | |
2586 | if (arg != 0) { | |
2587 | blkno = fileno = (-1); | |
2588 | at_sm = 1; | |
2589 | } | |
2590 | break; | |
2591 | case MTBSS: | |
2592 | cmd[0] = SPACE; | |
2593 | cmd[1] = 0x04; /* Space Setmarks */ | |
2594 | ltmp = (-arg); | |
2595 | cmd[2] = (ltmp >> 16); | |
2596 | cmd[3] = (ltmp >> 8); | |
2597 | cmd[4] = ltmp; | |
2598 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "setmarks", cmd);) | |
2599 | if (arg != 0) { | |
2600 | blkno = fileno = (-1); | |
2601 | at_sm = 1; | |
2602 | } | |
2603 | break; | |
2604 | case MTWEOF: | |
2605 | case MTWSM: | |
2606 | if (STp->write_prot) | |
2607 | return (-EACCES); | |
2608 | cmd[0] = WRITE_FILEMARKS; | |
2609 | if (cmd_in == MTWSM) | |
2610 | cmd[1] = 2; | |
2611 | cmd[2] = (arg >> 16); | |
2612 | cmd[3] = (arg >> 8); | |
2613 | cmd[4] = arg; | |
2614 | timeout = STp->device->timeout; | |
2615 | DEBC( | |
2616 | if (cmd_in == MTWEOF) | |
2617 | printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name, | |
2618 | cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); | |
2619 | else | |
2620 | printk(ST_DEB_MSG "%s: Writing %d setmarks.\n", name, | |
2621 | cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); | |
2622 | ) | |
2623 | if (fileno >= 0) | |
2624 | fileno += arg; | |
2625 | blkno = 0; | |
2626 | at_sm = (cmd_in == MTWSM); | |
2627 | break; | |
2628 | case MTREW: | |
2629 | cmd[0] = REZERO_UNIT; | |
2630 | if (STp->immediate) { | |
2631 | cmd[1] = 1; /* Don't wait for completion */ | |
2632 | timeout = STp->device->timeout; | |
2633 | } | |
2634 | DEBC(printk(ST_DEB_MSG "%s: Rewinding tape.\n", name)); | |
2635 | fileno = blkno = at_sm = 0; | |
2636 | break; | |
2637 | case MTNOP: | |
2638 | DEBC(printk(ST_DEB_MSG "%s: No op on tape.\n", name)); | |
2639 | return 0; /* Should do something ? */ | |
2640 | break; | |
2641 | case MTRETEN: | |
2642 | cmd[0] = START_STOP; | |
2643 | if (STp->immediate) { | |
2644 | cmd[1] = 1; /* Don't wait for completion */ | |
2645 | timeout = STp->device->timeout; | |
2646 | } | |
2647 | cmd[4] = 3; | |
2648 | DEBC(printk(ST_DEB_MSG "%s: Retensioning tape.\n", name)); | |
2649 | fileno = blkno = at_sm = 0; | |
2650 | break; | |
2651 | case MTEOM: | |
2652 | if (!STp->fast_mteom) { | |
2653 | /* space to the end of tape */ | |
2654 | ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); | |
2655 | fileno = STps->drv_file; | |
2656 | if (STps->eof >= ST_EOD_1) | |
2657 | return 0; | |
2658 | /* The next lines would hide the number of spaced FileMarks | |
2659 | That's why I inserted the previous lines. I had no luck | |
2660 | with detecting EOM with FSF, so we go now to EOM. | |
2661 | Joerg Weule */ | |
2662 | } else | |
2663 | fileno = (-1); | |
2664 | cmd[0] = SPACE; | |
2665 | cmd[1] = 3; | |
2666 | DEBC(printk(ST_DEB_MSG "%s: Spacing to end of recorded medium.\n", | |
2667 | name)); | |
2668 | blkno = -1; | |
2669 | at_sm = 0; | |
2670 | break; | |
2671 | case MTERASE: | |
2672 | if (STp->write_prot) | |
2673 | return (-EACCES); | |
2674 | cmd[0] = ERASE; | |
2675 | cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ | |
2676 | if (STp->immediate) { | |
2677 | cmd[1] |= 2; /* Don't wait for completion */ | |
2678 | timeout = STp->device->timeout; | |
2679 | } | |
2680 | else | |
2681 | timeout = STp->long_timeout * 8; | |
2682 | ||
2683 | DEBC(printk(ST_DEB_MSG "%s: Erasing tape.\n", name)); | |
2684 | fileno = blkno = at_sm = 0; | |
2685 | break; | |
2686 | case MTSETBLK: /* Set block length */ | |
2687 | case MTSETDENSITY: /* Set tape density */ | |
2688 | case MTSETDRVBUFFER: /* Set drive buffering */ | |
2689 | case SET_DENS_AND_BLK: /* Set density and block size */ | |
2690 | chg_eof = 0; | |
2691 | if (STp->dirty || (STp->buffer)->buffer_bytes != 0) | |
2692 | return (-EIO); /* Not allowed if data in buffer */ | |
2693 | if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && | |
2694 | (arg & MT_ST_BLKSIZE_MASK) != 0 && | |
2695 | STp->max_block > 0 && | |
2696 | ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || | |
2697 | (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { | |
2698 | printk(KERN_WARNING "%s: Illegal block size.\n", name); | |
2699 | return (-EINVAL); | |
2700 | } | |
2701 | cmd[0] = MODE_SELECT; | |
2702 | if ((STp->use_pf & USE_PF)) | |
2703 | cmd[1] = MODE_SELECT_PAGE_FORMAT; | |
2704 | cmd[4] = datalen = 12; | |
2705 | direction = DMA_TO_DEVICE; | |
2706 | ||
2707 | memset((STp->buffer)->b_data, 0, 12); | |
2708 | if (cmd_in == MTSETDRVBUFFER) | |
2709 | (STp->buffer)->b_data[2] = (arg & 7) << 4; | |
2710 | else | |
2711 | (STp->buffer)->b_data[2] = | |
2712 | STp->drv_buffer << 4; | |
2713 | (STp->buffer)->b_data[3] = 8; /* block descriptor length */ | |
2714 | if (cmd_in == MTSETDENSITY) { | |
2715 | (STp->buffer)->b_data[4] = arg; | |
2716 | STp->density_changed = 1; /* At least we tried ;-) */ | |
2717 | } else if (cmd_in == SET_DENS_AND_BLK) | |
2718 | (STp->buffer)->b_data[4] = arg >> 24; | |
2719 | else | |
2720 | (STp->buffer)->b_data[4] = STp->density; | |
2721 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { | |
2722 | ltmp = arg & MT_ST_BLKSIZE_MASK; | |
2723 | if (cmd_in == MTSETBLK) | |
2724 | STp->blksize_changed = 1; /* At least we tried ;-) */ | |
2725 | } else | |
2726 | ltmp = STp->block_size; | |
2727 | (STp->buffer)->b_data[9] = (ltmp >> 16); | |
2728 | (STp->buffer)->b_data[10] = (ltmp >> 8); | |
2729 | (STp->buffer)->b_data[11] = ltmp; | |
2730 | timeout = STp->device->timeout; | |
2731 | DEBC( | |
2732 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) | |
2733 | printk(ST_DEB_MSG | |
2734 | "%s: Setting block size to %d bytes.\n", name, | |
2735 | (STp->buffer)->b_data[9] * 65536 + | |
2736 | (STp->buffer)->b_data[10] * 256 + | |
2737 | (STp->buffer)->b_data[11]); | |
2738 | if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) | |
2739 | printk(ST_DEB_MSG | |
2740 | "%s: Setting density code to %x.\n", name, | |
2741 | (STp->buffer)->b_data[4]); | |
2742 | if (cmd_in == MTSETDRVBUFFER) | |
2743 | printk(ST_DEB_MSG | |
2744 | "%s: Setting drive buffer code to %d.\n", name, | |
2745 | ((STp->buffer)->b_data[2] >> 4) & 7); | |
2746 | ) | |
2747 | break; | |
2748 | default: | |
2749 | return (-ENOSYS); | |
2750 | } | |
2751 | ||
2752 | SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, | |
2753 | timeout, MAX_RETRIES, 1); | |
2754 | if (!SRpnt) | |
2755 | return (STp->buffer)->syscall_result; | |
2756 | ||
2757 | ioctl_result = (STp->buffer)->syscall_result; | |
2758 | ||
2759 | if (!ioctl_result) { /* SCSI command successful */ | |
2760 | scsi_release_request(SRpnt); | |
2761 | SRpnt = NULL; | |
2762 | STps->drv_block = blkno; | |
2763 | STps->drv_file = fileno; | |
2764 | STps->at_sm = at_sm; | |
2765 | ||
2766 | if (cmd_in == MTBSFM) | |
2767 | ioctl_result = st_int_ioctl(STp, MTFSF, 1); | |
2768 | else if (cmd_in == MTFSFM) | |
2769 | ioctl_result = st_int_ioctl(STp, MTBSF, 1); | |
2770 | ||
2771 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { | |
2772 | int old_block_size = STp->block_size; | |
2773 | STp->block_size = arg & MT_ST_BLKSIZE_MASK; | |
2774 | if (STp->block_size != 0) { | |
2775 | if (old_block_size == 0) | |
2776 | normalize_buffer(STp->buffer); | |
2777 | (STp->buffer)->buffer_blocks = | |
2778 | (STp->buffer)->buffer_size / STp->block_size; | |
2779 | } | |
2780 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; | |
2781 | if (cmd_in == SET_DENS_AND_BLK) | |
2782 | STp->density = arg >> MT_ST_DENSITY_SHIFT; | |
2783 | } else if (cmd_in == MTSETDRVBUFFER) | |
2784 | STp->drv_buffer = (arg & 7); | |
2785 | else if (cmd_in == MTSETDENSITY) | |
2786 | STp->density = arg; | |
2787 | ||
2788 | if (cmd_in == MTEOM) | |
2789 | STps->eof = ST_EOD; | |
2790 | else if (cmd_in == MTFSF) | |
2791 | STps->eof = ST_FM; | |
2792 | else if (chg_eof) | |
2793 | STps->eof = ST_NOEOF; | |
2794 | ||
2795 | if (cmd_in == MTWEOF) | |
2796 | STps->rw = ST_IDLE; | |
2797 | } else { /* SCSI command was not completely successful. Don't return | |
2798 | from this block without releasing the SCSI command block! */ | |
2799 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
2800 | ||
2801 | if (cmdstatp->flags & SENSE_EOM) { | |
2802 | if (cmd_in != MTBSF && cmd_in != MTBSFM && | |
2803 | cmd_in != MTBSR && cmd_in != MTBSS) | |
2804 | STps->eof = ST_EOM_OK; | |
2805 | STps->drv_block = 0; | |
2806 | } | |
2807 | ||
2808 | if (cmdstatp->remainder_valid) | |
2809 | undone = (int)cmdstatp->uremainder64; | |
2810 | else | |
2811 | undone = 0; | |
2812 | ||
2813 | if (cmd_in == MTWEOF && | |
2814 | cmdstatp->have_sense && | |
2815 | (cmdstatp->flags & SENSE_EOM) && | |
2816 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
2817 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && | |
2818 | undone == 0) { | |
2819 | ioctl_result = 0; /* EOF written succesfully at EOM */ | |
2820 | if (fileno >= 0) | |
2821 | fileno++; | |
2822 | STps->drv_file = fileno; | |
2823 | STps->eof = ST_NOEOF; | |
2824 | } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { | |
2825 | if (fileno >= 0) | |
2826 | STps->drv_file = fileno - undone; | |
2827 | else | |
2828 | STps->drv_file = fileno; | |
2829 | STps->drv_block = -1; | |
2830 | STps->eof = ST_NOEOF; | |
2831 | } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { | |
2832 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ | |
2833 | undone = (-undone); | |
2834 | if (STps->drv_file >= 0) | |
2835 | STps->drv_file = fileno + undone; | |
2836 | STps->drv_block = 0; | |
2837 | STps->eof = ST_NOEOF; | |
2838 | } else if (cmd_in == MTFSR) { | |
2839 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ | |
2840 | if (STps->drv_file >= 0) | |
2841 | STps->drv_file++; | |
2842 | STps->drv_block = 0; | |
2843 | STps->eof = ST_FM; | |
2844 | } else { | |
2845 | if (blkno >= undone) | |
2846 | STps->drv_block = blkno - undone; | |
2847 | else | |
2848 | STps->drv_block = (-1); | |
2849 | STps->eof = ST_NOEOF; | |
2850 | } | |
2851 | } else if (cmd_in == MTBSR) { | |
2852 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ | |
2853 | STps->drv_file--; | |
2854 | STps->drv_block = (-1); | |
2855 | } else { | |
2856 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ | |
2857 | undone = (-undone); | |
2858 | if (STps->drv_block >= 0) | |
2859 | STps->drv_block = blkno + undone; | |
2860 | } | |
2861 | STps->eof = ST_NOEOF; | |
2862 | } else if (cmd_in == MTEOM) { | |
2863 | STps->drv_file = (-1); | |
2864 | STps->drv_block = (-1); | |
2865 | STps->eof = ST_EOD; | |
2866 | } else if (cmd_in == MTSETBLK || | |
2867 | cmd_in == MTSETDENSITY || | |
2868 | cmd_in == MTSETDRVBUFFER || | |
2869 | cmd_in == SET_DENS_AND_BLK) { | |
2870 | if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && | |
2871 | !(STp->use_pf & PF_TESTED)) { | |
2872 | /* Try the other possible state of Page Format if not | |
2873 | already tried */ | |
2874 | STp->use_pf = !STp->use_pf | PF_TESTED; | |
2875 | scsi_release_request(SRpnt); | |
2876 | SRpnt = NULL; | |
2877 | return st_int_ioctl(STp, cmd_in, arg); | |
2878 | } | |
2879 | } else if (chg_eof) | |
2880 | STps->eof = ST_NOEOF; | |
2881 | ||
2882 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) | |
2883 | STps->eof = ST_EOD; | |
2884 | ||
2885 | scsi_release_request(SRpnt); | |
2886 | SRpnt = NULL; | |
2887 | } | |
2888 | ||
2889 | return ioctl_result; | |
2890 | } | |
2891 | \f | |
2892 | ||
2893 | /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc | |
2894 | structure. */ | |
2895 | ||
2896 | static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, | |
2897 | int logical) | |
2898 | { | |
2899 | int result; | |
2900 | unsigned char scmd[MAX_COMMAND_SIZE]; | |
2901 | struct scsi_request *SRpnt; | |
2902 | DEB( char *name = tape_name(STp); ) | |
2903 | ||
2904 | if (STp->ready != ST_READY) | |
2905 | return (-EIO); | |
2906 | ||
2907 | memset(scmd, 0, MAX_COMMAND_SIZE); | |
2908 | if ((STp->device)->scsi_level < SCSI_2) { | |
2909 | scmd[0] = QFA_REQUEST_BLOCK; | |
2910 | scmd[4] = 3; | |
2911 | } else { | |
2912 | scmd[0] = READ_POSITION; | |
2913 | if (!logical && !STp->scsi2_logical) | |
2914 | scmd[1] = 1; | |
2915 | } | |
2916 | SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, | |
2917 | STp->device->timeout, MAX_READY_RETRIES, 1); | |
2918 | if (!SRpnt) | |
2919 | return (STp->buffer)->syscall_result; | |
2920 | ||
2921 | if ((STp->buffer)->syscall_result != 0 || | |
2922 | (STp->device->scsi_level >= SCSI_2 && | |
2923 | ((STp->buffer)->b_data[0] & 4) != 0)) { | |
2924 | *block = *partition = 0; | |
2925 | DEBC(printk(ST_DEB_MSG "%s: Can't read tape position.\n", name)); | |
2926 | result = (-EIO); | |
2927 | } else { | |
2928 | result = 0; | |
2929 | if ((STp->device)->scsi_level < SCSI_2) { | |
2930 | *block = ((STp->buffer)->b_data[0] << 16) | |
2931 | + ((STp->buffer)->b_data[1] << 8) | |
2932 | + (STp->buffer)->b_data[2]; | |
2933 | *partition = 0; | |
2934 | } else { | |
2935 | *block = ((STp->buffer)->b_data[4] << 24) | |
2936 | + ((STp->buffer)->b_data[5] << 16) | |
2937 | + ((STp->buffer)->b_data[6] << 8) | |
2938 | + (STp->buffer)->b_data[7]; | |
2939 | *partition = (STp->buffer)->b_data[1]; | |
2940 | if (((STp->buffer)->b_data[0] & 0x80) && | |
2941 | (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ | |
2942 | STp->ps[0].drv_block = STp->ps[0].drv_file = 0; | |
2943 | } | |
2944 | DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name, | |
2945 | *block, *partition)); | |
2946 | } | |
2947 | scsi_release_request(SRpnt); | |
2948 | SRpnt = NULL; | |
2949 | ||
2950 | return result; | |
2951 | } | |
2952 | ||
2953 | ||
2954 | /* Set the tape block and partition. Negative partition means that only the | |
2955 | block should be set in vendor specific way. */ | |
2956 | static int set_location(struct scsi_tape *STp, unsigned int block, int partition, | |
2957 | int logical) | |
2958 | { | |
2959 | struct st_partstat *STps; | |
2960 | int result, p; | |
2961 | unsigned int blk; | |
2962 | int timeout; | |
2963 | unsigned char scmd[MAX_COMMAND_SIZE]; | |
2964 | struct scsi_request *SRpnt; | |
2965 | DEB( char *name = tape_name(STp); ) | |
2966 | ||
2967 | if (STp->ready != ST_READY) | |
2968 | return (-EIO); | |
2969 | timeout = STp->long_timeout; | |
2970 | STps = &(STp->ps[STp->partition]); | |
2971 | ||
2972 | DEBC(printk(ST_DEB_MSG "%s: Setting block to %d and partition to %d.\n", | |
2973 | name, block, partition)); | |
2974 | DEB(if (partition < 0) | |
2975 | return (-EIO); ) | |
2976 | ||
2977 | /* Update the location at the partition we are leaving */ | |
2978 | if ((!STp->can_partitions && partition != 0) || | |
2979 | partition >= ST_NBR_PARTITIONS) | |
2980 | return (-EINVAL); | |
2981 | if (partition != STp->partition) { | |
2982 | if (get_location(STp, &blk, &p, 1)) | |
2983 | STps->last_block_valid = 0; | |
2984 | else { | |
2985 | STps->last_block_valid = 1; | |
2986 | STps->last_block_visited = blk; | |
2987 | DEBC(printk(ST_DEB_MSG | |
2988 | "%s: Visited block %d for partition %d saved.\n", | |
2989 | name, blk, STp->partition)); | |
2990 | } | |
2991 | } | |
2992 | ||
2993 | memset(scmd, 0, MAX_COMMAND_SIZE); | |
2994 | if ((STp->device)->scsi_level < SCSI_2) { | |
2995 | scmd[0] = QFA_SEEK_BLOCK; | |
2996 | scmd[2] = (block >> 16); | |
2997 | scmd[3] = (block >> 8); | |
2998 | scmd[4] = block; | |
2999 | scmd[5] = 0; | |
3000 | } else { | |
3001 | scmd[0] = SEEK_10; | |
3002 | scmd[3] = (block >> 24); | |
3003 | scmd[4] = (block >> 16); | |
3004 | scmd[5] = (block >> 8); | |
3005 | scmd[6] = block; | |
3006 | if (!logical && !STp->scsi2_logical) | |
3007 | scmd[1] = 4; | |
3008 | if (STp->partition != partition) { | |
3009 | scmd[1] |= 2; | |
3010 | scmd[8] = partition; | |
3011 | DEBC(printk(ST_DEB_MSG | |
3012 | "%s: Trying to change partition from %d to %d\n", | |
3013 | name, STp->partition, partition)); | |
3014 | } | |
3015 | } | |
3016 | if (STp->immediate) { | |
3017 | scmd[1] |= 1; /* Don't wait for completion */ | |
3018 | timeout = STp->device->timeout; | |
3019 | } | |
3020 | ||
3021 | SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, | |
3022 | timeout, MAX_READY_RETRIES, 1); | |
3023 | if (!SRpnt) | |
3024 | return (STp->buffer)->syscall_result; | |
3025 | ||
3026 | STps->drv_block = STps->drv_file = (-1); | |
3027 | STps->eof = ST_NOEOF; | |
3028 | if ((STp->buffer)->syscall_result != 0) { | |
3029 | result = (-EIO); | |
3030 | if (STp->can_partitions && | |
3031 | (STp->device)->scsi_level >= SCSI_2 && | |
3032 | (p = find_partition(STp)) >= 0) | |
3033 | STp->partition = p; | |
3034 | } else { | |
3035 | if (STp->can_partitions) { | |
3036 | STp->partition = partition; | |
3037 | STps = &(STp->ps[partition]); | |
3038 | if (!STps->last_block_valid || | |
3039 | STps->last_block_visited != block) { | |
3040 | STps->at_sm = 0; | |
3041 | STps->rw = ST_IDLE; | |
3042 | } | |
3043 | } else | |
3044 | STps->at_sm = 0; | |
3045 | if (block == 0) | |
3046 | STps->drv_block = STps->drv_file = 0; | |
3047 | result = 0; | |
3048 | } | |
3049 | ||
3050 | scsi_release_request(SRpnt); | |
3051 | SRpnt = NULL; | |
3052 | ||
3053 | return result; | |
3054 | } | |
3055 | ||
3056 | ||
3057 | /* Find the current partition number for the drive status. Called from open and | |
3058 | returns either partition number of negative error code. */ | |
3059 | static int find_partition(struct scsi_tape *STp) | |
3060 | { | |
3061 | int i, partition; | |
3062 | unsigned int block; | |
3063 | ||
3064 | if ((i = get_location(STp, &block, &partition, 1)) < 0) | |
3065 | return i; | |
3066 | if (partition >= ST_NBR_PARTITIONS) | |
3067 | return (-EIO); | |
3068 | return partition; | |
3069 | } | |
3070 | ||
3071 | ||
3072 | /* Change the partition if necessary */ | |
3073 | static int switch_partition(struct scsi_tape *STp) | |
3074 | { | |
3075 | struct st_partstat *STps; | |
3076 | ||
3077 | if (STp->partition == STp->new_partition) | |
3078 | return 0; | |
3079 | STps = &(STp->ps[STp->new_partition]); | |
3080 | if (!STps->last_block_valid) | |
3081 | STps->last_block_visited = 0; | |
3082 | return set_location(STp, STps->last_block_visited, STp->new_partition, 1); | |
3083 | } | |
3084 | \f | |
3085 | /* Functions for reading and writing the medium partition mode page. */ | |
3086 | ||
3087 | #define PART_PAGE 0x11 | |
3088 | #define PART_PAGE_FIXED_LENGTH 8 | |
3089 | ||
3090 | #define PP_OFF_MAX_ADD_PARTS 2 | |
3091 | #define PP_OFF_NBR_ADD_PARTS 3 | |
3092 | #define PP_OFF_FLAGS 4 | |
3093 | #define PP_OFF_PART_UNITS 6 | |
3094 | #define PP_OFF_RESERVED 7 | |
3095 | ||
3096 | #define PP_BIT_IDP 0x20 | |
3097 | #define PP_MSK_PSUM_MB 0x10 | |
3098 | ||
3099 | /* Get the number of partitions on the tape. As a side effect reads the | |
3100 | mode page into the tape buffer. */ | |
3101 | static int nbr_partitions(struct scsi_tape *STp) | |
3102 | { | |
3103 | int result; | |
3104 | DEB( char *name = tape_name(STp); ) | |
3105 | ||
3106 | if (STp->ready != ST_READY) | |
3107 | return (-EIO); | |
3108 | ||
3109 | result = read_mode_page(STp, PART_PAGE, 1); | |
3110 | ||
3111 | if (result) { | |
3112 | DEBC(printk(ST_DEB_MSG "%s: Can't read medium partition page.\n", | |
3113 | name)); | |
3114 | result = (-EIO); | |
3115 | } else { | |
3116 | result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + | |
3117 | PP_OFF_NBR_ADD_PARTS] + 1; | |
3118 | DEBC(printk(ST_DEB_MSG "%s: Number of partitions %d.\n", name, result)); | |
3119 | } | |
3120 | ||
3121 | return result; | |
3122 | } | |
3123 | ||
3124 | ||
3125 | /* Partition the tape into two partitions if size > 0 or one partition if | |
3126 | size == 0. | |
3127 | ||
3128 | The block descriptors are read and written because Sony SDT-7000 does not | |
3129 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). | |
3130 | ||
3131 | My HP C1533A drive returns only one partition size field. This is used to | |
3132 | set the size of partition 1. There is no size field for the default partition. | |
3133 | Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is | |
3134 | used to set the size of partition 1 (this is what the SCSI-3 standard specifies). | |
3135 | The following algorithm is used to accommodate both drives: if the number of | |
3136 | partition size fields is greater than the maximum number of additional partitions | |
3137 | in the mode page, the second field is used. Otherwise the first field is used. | |
3138 | ||
3139 | For Seagate DDS drives the page length must be 8 when no partitions is defined | |
3140 | and 10 when 1 partition is defined (information from Eric Lee Green). This is | |
3141 | is acceptable also to some other old drives and enforced if the first partition | |
3142 | size field is used for the first additional partition size. | |
3143 | */ | |
3144 | static int partition_tape(struct scsi_tape *STp, int size) | |
3145 | { | |
3146 | char *name = tape_name(STp); | |
3147 | int result; | |
3148 | int pgo, psd_cnt, psdo; | |
3149 | unsigned char *bp; | |
3150 | ||
3151 | result = read_mode_page(STp, PART_PAGE, 0); | |
3152 | if (result) { | |
3153 | DEBC(printk(ST_DEB_MSG "%s: Can't read partition mode page.\n", name)); | |
3154 | return result; | |
3155 | } | |
3156 | /* The mode page is in the buffer. Let's modify it and write it. */ | |
3157 | bp = (STp->buffer)->b_data; | |
3158 | pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; | |
3159 | DEBC(printk(ST_DEB_MSG "%s: Partition page length is %d bytes.\n", | |
3160 | name, bp[pgo + MP_OFF_PAGE_LENGTH] + 2)); | |
3161 | ||
3162 | psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; | |
3163 | psdo = pgo + PART_PAGE_FIXED_LENGTH; | |
3164 | if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) { | |
3165 | bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */ | |
3166 | psdo += 2; | |
3167 | } | |
3168 | memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); | |
3169 | ||
3170 | DEBC(printk("%s: psd_cnt %d, max.parts %d, nbr_parts %d\n", name, | |
3171 | psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], | |
3172 | bp[pgo + PP_OFF_NBR_ADD_PARTS])); | |
3173 | ||
3174 | if (size <= 0) { | |
3175 | bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; | |
3176 | if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) | |
3177 | bp[pgo + MP_OFF_PAGE_LENGTH] = 6; | |
3178 | DEBC(printk(ST_DEB_MSG "%s: Formatting tape with one partition.\n", | |
3179 | name)); | |
3180 | } else { | |
3181 | bp[psdo] = (size >> 8) & 0xff; | |
3182 | bp[psdo + 1] = size & 0xff; | |
3183 | bp[pgo + 3] = 1; | |
3184 | if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) | |
3185 | bp[pgo + MP_OFF_PAGE_LENGTH] = 8; | |
3186 | DEBC(printk(ST_DEB_MSG | |
3187 | "%s: Formatting tape with two partitions (1 = %d MB).\n", | |
3188 | name, size)); | |
3189 | } | |
3190 | bp[pgo + PP_OFF_PART_UNITS] = 0; | |
3191 | bp[pgo + PP_OFF_RESERVED] = 0; | |
3192 | bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB; | |
3193 | ||
3194 | result = write_mode_page(STp, PART_PAGE, 1); | |
3195 | if (result) { | |
3196 | printk(KERN_INFO "%s: Partitioning of tape failed.\n", name); | |
3197 | result = (-EIO); | |
3198 | } | |
3199 | ||
3200 | return result; | |
3201 | } | |
3202 | \f | |
3203 | ||
3204 | ||
3205 | /* The ioctl command */ | |
3206 | static int st_ioctl(struct inode *inode, struct file *file, | |
3207 | unsigned int cmd_in, unsigned long arg) | |
3208 | { | |
3209 | int i, cmd_nr, cmd_type, bt; | |
3210 | int retval = 0; | |
3211 | unsigned int blk; | |
3212 | struct scsi_tape *STp = file->private_data; | |
3213 | struct st_modedef *STm; | |
3214 | struct st_partstat *STps; | |
3215 | char *name = tape_name(STp); | |
3216 | void __user *p = (void __user *)arg; | |
3217 | ||
3218 | if (down_interruptible(&STp->lock)) | |
3219 | return -ERESTARTSYS; | |
3220 | ||
3221 | DEB( | |
3222 | if (debugging && !STp->in_use) { | |
3223 | printk(ST_DEB_MSG "%s: Incorrect device.\n", name); | |
3224 | retval = (-EIO); | |
3225 | goto out; | |
3226 | } ) /* end DEB */ | |
3227 | ||
3228 | STm = &(STp->modes[STp->current_mode]); | |
3229 | STps = &(STp->ps[STp->partition]); | |
3230 | ||
3231 | /* | |
3232 | * If we are in the middle of error recovery, don't let anyone | |
3233 | * else try and use this device. Also, if error recovery fails, it | |
3234 | * may try and take the device offline, in which case all further | |
3235 | * access to the device is prohibited. | |
3236 | */ | |
3237 | retval = scsi_nonblockable_ioctl(STp->device, cmd_in, p, file); | |
3238 | if (!scsi_block_when_processing_errors(STp->device) || retval != -ENODEV) | |
3239 | goto out; | |
3240 | retval = 0; | |
3241 | ||
3242 | cmd_type = _IOC_TYPE(cmd_in); | |
3243 | cmd_nr = _IOC_NR(cmd_in); | |
3244 | ||
3245 | if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { | |
3246 | struct mtop mtc; | |
3247 | ||
3248 | if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { | |
3249 | retval = (-EINVAL); | |
3250 | goto out; | |
3251 | } | |
3252 | ||
3253 | i = copy_from_user(&mtc, p, sizeof(struct mtop)); | |
3254 | if (i) { | |
3255 | retval = (-EFAULT); | |
3256 | goto out; | |
3257 | } | |
3258 | ||
3259 | if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { | |
3260 | printk(KERN_WARNING | |
3261 | "%s: MTSETDRVBUFFER only allowed for root.\n", name); | |
3262 | retval = (-EPERM); | |
3263 | goto out; | |
3264 | } | |
3265 | if (!STm->defined && | |
3266 | (mtc.mt_op != MTSETDRVBUFFER && | |
3267 | (mtc.mt_count & MT_ST_OPTIONS) == 0)) { | |
3268 | retval = (-ENXIO); | |
3269 | goto out; | |
3270 | } | |
3271 | ||
3272 | if (!STp->pos_unknown) { | |
3273 | ||
3274 | if (STps->eof == ST_FM_HIT) { | |
3275 | if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || | |
3276 | mtc.mt_op == MTEOM) { | |
3277 | mtc.mt_count -= 1; | |
3278 | if (STps->drv_file >= 0) | |
3279 | STps->drv_file += 1; | |
3280 | } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { | |
3281 | mtc.mt_count += 1; | |
3282 | if (STps->drv_file >= 0) | |
3283 | STps->drv_file += 1; | |
3284 | } | |
3285 | } | |
3286 | ||
3287 | if (mtc.mt_op == MTSEEK) { | |
3288 | /* Old position must be restored if partition will be | |
3289 | changed */ | |
3290 | i = !STp->can_partitions || | |
3291 | (STp->new_partition != STp->partition); | |
3292 | } else { | |
3293 | i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || | |
3294 | mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || | |
3295 | mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || | |
3296 | mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || | |
3297 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || | |
3298 | mtc.mt_op == MTCOMPRESSION; | |
3299 | } | |
3300 | i = flush_buffer(STp, i); | |
3301 | if (i < 0) { | |
3302 | retval = i; | |
3303 | goto out; | |
3304 | } | |
3305 | if (STps->rw == ST_WRITING && | |
3306 | (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || | |
3307 | mtc.mt_op == MTSEEK || | |
3308 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { | |
3309 | i = st_int_ioctl(STp, MTWEOF, 1); | |
3310 | if (i < 0) { | |
3311 | retval = i; | |
3312 | goto out; | |
3313 | } | |
3314 | if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) | |
3315 | mtc.mt_count++; | |
3316 | STps->rw = ST_IDLE; | |
3317 | } | |
3318 | ||
3319 | } else { | |
3320 | /* | |
3321 | * If there was a bus reset, block further access | |
3322 | * to this device. If the user wants to rewind the tape, | |
3323 | * then reset the flag and allow access again. | |
3324 | */ | |
3325 | if (mtc.mt_op != MTREW && | |
3326 | mtc.mt_op != MTOFFL && | |
3327 | mtc.mt_op != MTRETEN && | |
3328 | mtc.mt_op != MTERASE && | |
3329 | mtc.mt_op != MTSEEK && | |
3330 | mtc.mt_op != MTEOM) { | |
3331 | retval = (-EIO); | |
3332 | goto out; | |
3333 | } | |
3334 | reset_state(STp); | |
3335 | /* remove this when the midlevel properly clears was_reset */ | |
3336 | STp->device->was_reset = 0; | |
3337 | } | |
3338 | ||
3339 | if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && | |
3340 | mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && | |
3341 | mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) | |
3342 | STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ | |
3343 | ||
3344 | if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) | |
3345 | do_door_lock(STp, 0); /* Ignore result! */ | |
3346 | ||
3347 | if (mtc.mt_op == MTSETDRVBUFFER && | |
3348 | (mtc.mt_count & MT_ST_OPTIONS) != 0) { | |
3349 | retval = st_set_options(STp, mtc.mt_count); | |
3350 | goto out; | |
3351 | } | |
3352 | ||
3353 | if (mtc.mt_op == MTSETPART) { | |
3354 | if (!STp->can_partitions || | |
3355 | mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { | |
3356 | retval = (-EINVAL); | |
3357 | goto out; | |
3358 | } | |
3359 | if (mtc.mt_count >= STp->nbr_partitions && | |
3360 | (STp->nbr_partitions = nbr_partitions(STp)) < 0) { | |
3361 | retval = (-EIO); | |
3362 | goto out; | |
3363 | } | |
3364 | if (mtc.mt_count >= STp->nbr_partitions) { | |
3365 | retval = (-EINVAL); | |
3366 | goto out; | |
3367 | } | |
3368 | STp->new_partition = mtc.mt_count; | |
3369 | retval = 0; | |
3370 | goto out; | |
3371 | } | |
3372 | ||
3373 | if (mtc.mt_op == MTMKPART) { | |
3374 | if (!STp->can_partitions) { | |
3375 | retval = (-EINVAL); | |
3376 | goto out; | |
3377 | } | |
3378 | if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 || | |
3379 | (i = partition_tape(STp, mtc.mt_count)) < 0) { | |
3380 | retval = i; | |
3381 | goto out; | |
3382 | } | |
3383 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
3384 | STp->ps[i].rw = ST_IDLE; | |
3385 | STp->ps[i].at_sm = 0; | |
3386 | STp->ps[i].last_block_valid = 0; | |
3387 | } | |
3388 | STp->partition = STp->new_partition = 0; | |
3389 | STp->nbr_partitions = 1; /* Bad guess ?-) */ | |
3390 | STps->drv_block = STps->drv_file = 0; | |
3391 | retval = 0; | |
3392 | goto out; | |
3393 | } | |
3394 | ||
3395 | if (mtc.mt_op == MTSEEK) { | |
3396 | i = set_location(STp, mtc.mt_count, STp->new_partition, 0); | |
3397 | if (!STp->can_partitions) | |
3398 | STp->ps[0].rw = ST_IDLE; | |
3399 | retval = i; | |
3400 | goto out; | |
3401 | } | |
3402 | ||
3403 | if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { | |
3404 | retval = do_load_unload(STp, file, 0); | |
3405 | goto out; | |
3406 | } | |
3407 | ||
3408 | if (mtc.mt_op == MTLOAD) { | |
3409 | retval = do_load_unload(STp, file, max(1, mtc.mt_count)); | |
3410 | goto out; | |
3411 | } | |
3412 | ||
3413 | if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { | |
3414 | retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); | |
3415 | goto out; | |
3416 | } | |
3417 | ||
3418 | if (STp->can_partitions && STp->ready == ST_READY && | |
3419 | (i = switch_partition(STp)) < 0) { | |
3420 | retval = i; | |
3421 | goto out; | |
3422 | } | |
3423 | ||
3424 | if (mtc.mt_op == MTCOMPRESSION) | |
3425 | retval = st_compression(STp, (mtc.mt_count & 1)); | |
3426 | else | |
3427 | retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); | |
3428 | goto out; | |
3429 | } | |
3430 | if (!STm->defined) { | |
3431 | retval = (-ENXIO); | |
3432 | goto out; | |
3433 | } | |
3434 | ||
3435 | if ((i = flush_buffer(STp, 0)) < 0) { | |
3436 | retval = i; | |
3437 | goto out; | |
3438 | } | |
3439 | if (STp->can_partitions && | |
3440 | (i = switch_partition(STp)) < 0) { | |
3441 | retval = i; | |
3442 | goto out; | |
3443 | } | |
3444 | ||
3445 | if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { | |
3446 | struct mtget mt_status; | |
3447 | ||
3448 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { | |
3449 | retval = (-EINVAL); | |
3450 | goto out; | |
3451 | } | |
3452 | ||
3453 | mt_status.mt_type = STp->tape_type; | |
3454 | mt_status.mt_dsreg = | |
3455 | ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | | |
3456 | ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); | |
3457 | mt_status.mt_blkno = STps->drv_block; | |
3458 | mt_status.mt_fileno = STps->drv_file; | |
3459 | if (STp->block_size != 0) { | |
3460 | if (STps->rw == ST_WRITING) | |
3461 | mt_status.mt_blkno += | |
3462 | (STp->buffer)->buffer_bytes / STp->block_size; | |
3463 | else if (STps->rw == ST_READING) | |
3464 | mt_status.mt_blkno -= | |
3465 | ((STp->buffer)->buffer_bytes + | |
3466 | STp->block_size - 1) / STp->block_size; | |
3467 | } | |
3468 | ||
3469 | mt_status.mt_gstat = 0; | |
3470 | if (STp->drv_write_prot) | |
3471 | mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
3472 | if (mt_status.mt_blkno == 0) { | |
3473 | if (mt_status.mt_fileno == 0) | |
3474 | mt_status.mt_gstat |= GMT_BOT(0xffffffff); | |
3475 | else | |
3476 | mt_status.mt_gstat |= GMT_EOF(0xffffffff); | |
3477 | } | |
3478 | mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); | |
3479 | mt_status.mt_resid = STp->partition; | |
3480 | if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) | |
3481 | mt_status.mt_gstat |= GMT_EOT(0xffffffff); | |
3482 | else if (STps->eof >= ST_EOM_OK) | |
3483 | mt_status.mt_gstat |= GMT_EOD(0xffffffff); | |
3484 | if (STp->density == 1) | |
3485 | mt_status.mt_gstat |= GMT_D_800(0xffffffff); | |
3486 | else if (STp->density == 2) | |
3487 | mt_status.mt_gstat |= GMT_D_1600(0xffffffff); | |
3488 | else if (STp->density == 3) | |
3489 | mt_status.mt_gstat |= GMT_D_6250(0xffffffff); | |
3490 | if (STp->ready == ST_READY) | |
3491 | mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); | |
3492 | if (STp->ready == ST_NO_TAPE) | |
3493 | mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); | |
3494 | if (STps->at_sm) | |
3495 | mt_status.mt_gstat |= GMT_SM(0xffffffff); | |
3496 | if (STm->do_async_writes || | |
3497 | (STm->do_buffer_writes && STp->block_size != 0) || | |
3498 | STp->drv_buffer != 0) | |
3499 | mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); | |
3500 | if (STp->cleaning_req) | |
3501 | mt_status.mt_gstat |= GMT_CLN(0xffffffff); | |
3502 | ||
3503 | i = copy_to_user(p, &mt_status, sizeof(struct mtget)); | |
3504 | if (i) { | |
3505 | retval = (-EFAULT); | |
3506 | goto out; | |
3507 | } | |
3508 | ||
3509 | STp->recover_reg = 0; /* Clear after read */ | |
3510 | retval = 0; | |
3511 | goto out; | |
3512 | } /* End of MTIOCGET */ | |
3513 | if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { | |
3514 | struct mtpos mt_pos; | |
3515 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { | |
3516 | retval = (-EINVAL); | |
3517 | goto out; | |
3518 | } | |
3519 | if ((i = get_location(STp, &blk, &bt, 0)) < 0) { | |
3520 | retval = i; | |
3521 | goto out; | |
3522 | } | |
3523 | mt_pos.mt_blkno = blk; | |
3524 | i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); | |
3525 | if (i) | |
3526 | retval = (-EFAULT); | |
3527 | goto out; | |
3528 | } | |
3529 | up(&STp->lock); | |
3530 | switch (cmd_in) { | |
3531 | case SCSI_IOCTL_GET_IDLUN: | |
3532 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
3533 | break; | |
3534 | default: | |
16c4b3e2 KM |
3535 | if ((cmd_in == SG_IO || |
3536 | cmd_in == SCSI_IOCTL_SEND_COMMAND || | |
3537 | cmd_in == CDROM_SEND_PACKET) && | |
3538 | !capable(CAP_SYS_RAWIO)) | |
1da177e4 LT |
3539 | i = -EPERM; |
3540 | else | |
3541 | i = scsi_cmd_ioctl(file, STp->disk, cmd_in, p); | |
3542 | if (i != -ENOTTY) | |
3543 | return i; | |
3544 | break; | |
3545 | } | |
16c4b3e2 KM |
3546 | retval = scsi_ioctl(STp->device, cmd_in, p); |
3547 | if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */ | |
3548 | STp->rew_at_close = 0; | |
3549 | STp->ready = ST_NO_TAPE; | |
3550 | } | |
3551 | return retval; | |
1da177e4 LT |
3552 | |
3553 | out: | |
3554 | up(&STp->lock); | |
3555 | return retval; | |
3556 | } | |
3557 | ||
3558 | #ifdef CONFIG_COMPAT | |
3559 | static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
3560 | { | |
3561 | struct scsi_tape *STp = file->private_data; | |
3562 | struct scsi_device *sdev = STp->device; | |
3563 | int ret = -ENOIOCTLCMD; | |
3564 | if (sdev->host->hostt->compat_ioctl) { | |
3565 | ||
3566 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); | |
3567 | ||
3568 | } | |
3569 | return ret; | |
3570 | } | |
3571 | #endif | |
3572 | ||
3573 | \f | |
3574 | ||
3575 | /* Try to allocate a new tape buffer. Calling function must not hold | |
3576 | dev_arr_lock. */ | |
3577 | static struct st_buffer * | |
3578 | new_tape_buffer(int from_initialization, int need_dma, int max_sg) | |
3579 | { | |
c53033f6 AV |
3580 | int i, got = 0, segs = 0; |
3581 | gfp_t priority; | |
1da177e4 LT |
3582 | struct st_buffer *tb; |
3583 | ||
3584 | if (from_initialization) | |
3585 | priority = GFP_ATOMIC; | |
3586 | else | |
3587 | priority = GFP_KERNEL; | |
3588 | ||
3589 | i = sizeof(struct st_buffer) + (max_sg - 1) * sizeof(struct scatterlist) + | |
3590 | max_sg * sizeof(struct st_buf_fragment); | |
3591 | tb = kmalloc(i, priority); | |
3592 | if (!tb) { | |
3593 | printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); | |
3594 | return NULL; | |
3595 | } | |
3596 | memset(tb, 0, i); | |
3597 | tb->frp_segs = tb->orig_frp_segs = segs; | |
3598 | tb->use_sg = max_sg; | |
3599 | if (segs > 0) | |
3600 | tb->b_data = page_address(tb->sg[0].page); | |
3601 | tb->frp = (struct st_buf_fragment *)(&(tb->sg[0]) + max_sg); | |
3602 | ||
3603 | tb->in_use = 1; | |
3604 | tb->dma = need_dma; | |
3605 | tb->buffer_size = got; | |
3606 | ||
3607 | return tb; | |
3608 | } | |
3609 | ||
3610 | ||
3611 | /* Try to allocate enough space in the tape buffer */ | |
3612 | static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) | |
3613 | { | |
c53033f6 AV |
3614 | int segs, nbr, max_segs, b_size, order, got; |
3615 | gfp_t priority; | |
1da177e4 LT |
3616 | |
3617 | if (new_size <= STbuffer->buffer_size) | |
3618 | return 1; | |
3619 | ||
3620 | if (STbuffer->buffer_size <= PAGE_SIZE) | |
3621 | normalize_buffer(STbuffer); /* Avoid extra segment */ | |
3622 | ||
3623 | max_segs = STbuffer->use_sg; | |
3624 | nbr = max_segs - STbuffer->frp_segs; | |
3625 | if (nbr <= 0) | |
3626 | return 0; | |
3627 | ||
3628 | priority = GFP_KERNEL | __GFP_NOWARN; | |
3629 | if (need_dma) | |
3630 | priority |= GFP_DMA; | |
3631 | for (b_size = PAGE_SIZE, order=0; | |
3632 | b_size < new_size - STbuffer->buffer_size; | |
3633 | order++, b_size *= 2) | |
3634 | ; /* empty */ | |
3635 | ||
3636 | for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; | |
3637 | segs < max_segs && got < new_size;) { | |
3638 | STbuffer->frp[segs].page = alloc_pages(priority, order); | |
3639 | if (STbuffer->frp[segs].page == NULL) { | |
3640 | if (new_size - got <= (max_segs - segs) * b_size / 2) { | |
3641 | b_size /= 2; /* Large enough for the rest of the buffers */ | |
3642 | order--; | |
3643 | continue; | |
3644 | } | |
3645 | DEB(STbuffer->buffer_size = got); | |
3646 | normalize_buffer(STbuffer); | |
3647 | return 0; | |
3648 | } | |
3649 | STbuffer->frp[segs].length = b_size; | |
3650 | STbuffer->frp_segs += 1; | |
3651 | got += b_size; | |
3652 | STbuffer->buffer_size = got; | |
3653 | segs++; | |
3654 | } | |
3655 | STbuffer->b_data = page_address(STbuffer->frp[0].page); | |
3656 | ||
3657 | return 1; | |
3658 | } | |
3659 | ||
3660 | ||
3661 | /* Release the extra buffer */ | |
3662 | static void normalize_buffer(struct st_buffer * STbuffer) | |
3663 | { | |
3664 | int i, order; | |
3665 | ||
3666 | for (i = STbuffer->orig_frp_segs; i < STbuffer->frp_segs; i++) { | |
3667 | order = get_order(STbuffer->frp[i].length); | |
3668 | __free_pages(STbuffer->frp[i].page, order); | |
3669 | STbuffer->buffer_size -= STbuffer->frp[i].length; | |
3670 | } | |
3671 | STbuffer->frp_segs = STbuffer->orig_frp_segs; | |
3672 | STbuffer->frp_sg_current = 0; | |
3673 | } | |
3674 | ||
3675 | ||
3676 | /* Move data from the user buffer to the tape buffer. Returns zero (success) or | |
3677 | negative error code. */ | |
3678 | static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) | |
3679 | { | |
3680 | int i, cnt, res, offset; | |
3681 | ||
3682 | for (i = 0, offset = st_bp->buffer_bytes; | |
3683 | i < st_bp->frp_segs && offset >= st_bp->frp[i].length; i++) | |
3684 | offset -= st_bp->frp[i].length; | |
3685 | if (i == st_bp->frp_segs) { /* Should never happen */ | |
3686 | printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); | |
3687 | return (-EIO); | |
3688 | } | |
3689 | for (; i < st_bp->frp_segs && do_count > 0; i++) { | |
3690 | cnt = st_bp->frp[i].length - offset < do_count ? | |
3691 | st_bp->frp[i].length - offset : do_count; | |
3692 | res = copy_from_user(page_address(st_bp->frp[i].page) + offset, ubp, cnt); | |
3693 | if (res) | |
3694 | return (-EFAULT); | |
3695 | do_count -= cnt; | |
3696 | st_bp->buffer_bytes += cnt; | |
3697 | ubp += cnt; | |
3698 | offset = 0; | |
3699 | } | |
3700 | if (do_count) /* Should never happen */ | |
3701 | return (-EIO); | |
3702 | ||
3703 | return 0; | |
3704 | } | |
3705 | ||
3706 | ||
3707 | /* Move data from the tape buffer to the user buffer. Returns zero (success) or | |
3708 | negative error code. */ | |
3709 | static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) | |
3710 | { | |
3711 | int i, cnt, res, offset; | |
3712 | ||
3713 | for (i = 0, offset = st_bp->read_pointer; | |
3714 | i < st_bp->frp_segs && offset >= st_bp->frp[i].length; i++) | |
3715 | offset -= st_bp->frp[i].length; | |
3716 | if (i == st_bp->frp_segs) { /* Should never happen */ | |
3717 | printk(KERN_WARNING "st: from_buffer offset overflow.\n"); | |
3718 | return (-EIO); | |
3719 | } | |
3720 | for (; i < st_bp->frp_segs && do_count > 0; i++) { | |
3721 | cnt = st_bp->frp[i].length - offset < do_count ? | |
3722 | st_bp->frp[i].length - offset : do_count; | |
3723 | res = copy_to_user(ubp, page_address(st_bp->frp[i].page) + offset, cnt); | |
3724 | if (res) | |
3725 | return (-EFAULT); | |
3726 | do_count -= cnt; | |
3727 | st_bp->buffer_bytes -= cnt; | |
3728 | st_bp->read_pointer += cnt; | |
3729 | ubp += cnt; | |
3730 | offset = 0; | |
3731 | } | |
3732 | if (do_count) /* Should never happen */ | |
3733 | return (-EIO); | |
3734 | ||
3735 | return 0; | |
3736 | } | |
3737 | ||
3738 | ||
3739 | /* Move data towards start of buffer */ | |
3740 | static void move_buffer_data(struct st_buffer * st_bp, int offset) | |
3741 | { | |
3742 | int src_seg, dst_seg, src_offset = 0, dst_offset; | |
3743 | int count, total; | |
3744 | ||
3745 | if (offset == 0) | |
3746 | return; | |
3747 | ||
3748 | total=st_bp->buffer_bytes - offset; | |
3749 | for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { | |
3750 | src_offset = offset; | |
3751 | if (src_offset < st_bp->frp[src_seg].length) | |
3752 | break; | |
3753 | offset -= st_bp->frp[src_seg].length; | |
3754 | } | |
3755 | ||
3756 | st_bp->buffer_bytes = st_bp->read_pointer = total; | |
3757 | for (dst_seg=dst_offset=0; total > 0; ) { | |
3758 | count = min(st_bp->frp[dst_seg].length - dst_offset, | |
3759 | st_bp->frp[src_seg].length - src_offset); | |
3760 | memmove(page_address(st_bp->frp[dst_seg].page) + dst_offset, | |
3761 | page_address(st_bp->frp[src_seg].page) + src_offset, count); | |
3762 | src_offset += count; | |
3763 | if (src_offset >= st_bp->frp[src_seg].length) { | |
3764 | src_seg++; | |
3765 | src_offset = 0; | |
3766 | } | |
3767 | dst_offset += count; | |
3768 | if (dst_offset >= st_bp->frp[dst_seg].length) { | |
3769 | dst_seg++; | |
3770 | dst_offset = 0; | |
3771 | } | |
3772 | total -= count; | |
3773 | } | |
3774 | } | |
3775 | ||
3776 | ||
3777 | /* Fill the s/g list up to the length required for this transfer */ | |
3778 | static void buf_to_sg(struct st_buffer *STbp, unsigned int length) | |
3779 | { | |
3780 | int i; | |
3781 | unsigned int count; | |
3782 | struct scatterlist *sg; | |
3783 | struct st_buf_fragment *frp; | |
3784 | ||
3785 | if (length == STbp->frp_sg_current) | |
3786 | return; /* work already done */ | |
3787 | ||
3788 | sg = &(STbp->sg[0]); | |
3789 | frp = STbp->frp; | |
3790 | for (i=count=0; count < length; i++) { | |
3791 | sg[i].page = frp[i].page; | |
3792 | if (length - count > frp[i].length) | |
3793 | sg[i].length = frp[i].length; | |
3794 | else | |
3795 | sg[i].length = length - count; | |
3796 | count += sg[i].length; | |
3797 | sg[i].offset = 0; | |
3798 | } | |
3799 | STbp->sg_segs = i; | |
3800 | STbp->frp_sg_current = length; | |
3801 | } | |
3802 | ||
3803 | ||
3804 | /* Validate the options from command line or module parameters */ | |
3805 | static void validate_options(void) | |
3806 | { | |
3807 | if (buffer_kbs > 0) | |
3808 | st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; | |
3809 | if (max_sg_segs >= ST_FIRST_SG) | |
3810 | st_max_sg_segs = max_sg_segs; | |
3811 | } | |
3812 | ||
3813 | #ifndef MODULE | |
3814 | /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. | |
3815 | */ | |
3816 | static int __init st_setup(char *str) | |
3817 | { | |
3818 | int i, len, ints[5]; | |
3819 | char *stp; | |
3820 | ||
3821 | stp = get_options(str, ARRAY_SIZE(ints), ints); | |
3822 | ||
3823 | if (ints[0] > 0) { | |
3824 | for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) | |
3825 | if (parms[i].val) | |
3826 | *parms[i].val = ints[i + 1]; | |
3827 | } else { | |
3828 | while (stp != NULL) { | |
3829 | for (i = 0; i < ARRAY_SIZE(parms); i++) { | |
3830 | len = strlen(parms[i].name); | |
3831 | if (!strncmp(stp, parms[i].name, len) && | |
3832 | (*(stp + len) == ':' || *(stp + len) == '=')) { | |
3833 | if (parms[i].val) | |
3834 | *parms[i].val = | |
3835 | simple_strtoul(stp + len + 1, NULL, 0); | |
3836 | else | |
3837 | printk(KERN_WARNING "st: Obsolete parameter %s\n", | |
3838 | parms[i].name); | |
3839 | break; | |
3840 | } | |
3841 | } | |
3842 | if (i >= sizeof(parms) / sizeof(struct st_dev_parm)) | |
3843 | printk(KERN_WARNING "st: invalid parameter in '%s'\n", | |
3844 | stp); | |
3845 | stp = strchr(stp, ','); | |
3846 | if (stp) | |
3847 | stp++; | |
3848 | } | |
3849 | } | |
3850 | ||
3851 | validate_options(); | |
3852 | ||
3853 | return 1; | |
3854 | } | |
3855 | ||
3856 | __setup("st=", st_setup); | |
3857 | ||
3858 | #endif | |
3859 | ||
3860 | static struct file_operations st_fops = | |
3861 | { | |
3862 | .owner = THIS_MODULE, | |
3863 | .read = st_read, | |
3864 | .write = st_write, | |
3865 | .ioctl = st_ioctl, | |
3866 | #ifdef CONFIG_COMPAT | |
3867 | .compat_ioctl = st_compat_ioctl, | |
3868 | #endif | |
3869 | .open = st_open, | |
3870 | .flush = st_flush, | |
3871 | .release = st_release, | |
3872 | }; | |
3873 | ||
3874 | static int st_probe(struct device *dev) | |
3875 | { | |
3876 | struct scsi_device *SDp = to_scsi_device(dev); | |
3877 | struct gendisk *disk = NULL; | |
3878 | struct cdev *cdev = NULL; | |
3879 | struct scsi_tape *tpnt = NULL; | |
3880 | struct st_modedef *STm; | |
3881 | struct st_partstat *STps; | |
3882 | struct st_buffer *buffer; | |
3883 | int i, j, mode, dev_num, error; | |
3884 | char *stp; | |
3885 | u64 bounce_limit; | |
3886 | ||
3887 | if (SDp->type != TYPE_TAPE) | |
3888 | return -ENODEV; | |
3889 | if ((stp = st_incompatible(SDp))) { | |
3bf743e7 | 3890 | sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n"); |
1da177e4 LT |
3891 | printk(KERN_INFO "st: The suggested driver is %s.\n", stp); |
3892 | return -ENODEV; | |
3893 | } | |
3894 | ||
3895 | i = SDp->host->sg_tablesize; | |
3896 | if (st_max_sg_segs < i) | |
3897 | i = st_max_sg_segs; | |
3898 | buffer = new_tape_buffer(1, (SDp->host)->unchecked_isa_dma, i); | |
3899 | if (buffer == NULL) { | |
3900 | printk(KERN_ERR | |
3901 | "st: Can't allocate new tape buffer. Device not attached.\n"); | |
3902 | goto out; | |
3903 | } | |
3904 | ||
3905 | disk = alloc_disk(1); | |
3906 | if (!disk) { | |
3907 | printk(KERN_ERR "st: out of memory. Device not attached.\n"); | |
3908 | goto out_buffer_free; | |
3909 | } | |
3910 | ||
3911 | write_lock(&st_dev_arr_lock); | |
3912 | if (st_nr_dev >= st_dev_max) { | |
3913 | struct scsi_tape **tmp_da; | |
3914 | int tmp_dev_max; | |
3915 | ||
3916 | tmp_dev_max = max(st_nr_dev * 2, 8); | |
3917 | if (tmp_dev_max > ST_MAX_TAPES) | |
3918 | tmp_dev_max = ST_MAX_TAPES; | |
3919 | if (tmp_dev_max <= st_nr_dev) { | |
3920 | write_unlock(&st_dev_arr_lock); | |
3921 | printk(KERN_ERR "st: Too many tape devices (max. %d).\n", | |
3922 | ST_MAX_TAPES); | |
3923 | goto out_put_disk; | |
3924 | } | |
3925 | ||
3926 | tmp_da = kmalloc(tmp_dev_max * sizeof(struct scsi_tape *), GFP_ATOMIC); | |
3927 | if (tmp_da == NULL) { | |
3928 | write_unlock(&st_dev_arr_lock); | |
3929 | printk(KERN_ERR "st: Can't extend device array.\n"); | |
3930 | goto out_put_disk; | |
3931 | } | |
3932 | ||
3933 | memset(tmp_da, 0, tmp_dev_max * sizeof(struct scsi_tape *)); | |
3934 | if (scsi_tapes != NULL) { | |
3935 | memcpy(tmp_da, scsi_tapes, | |
3936 | st_dev_max * sizeof(struct scsi_tape *)); | |
3937 | kfree(scsi_tapes); | |
3938 | } | |
3939 | scsi_tapes = tmp_da; | |
3940 | ||
3941 | st_dev_max = tmp_dev_max; | |
3942 | } | |
3943 | ||
3944 | for (i = 0; i < st_dev_max; i++) | |
3945 | if (scsi_tapes[i] == NULL) | |
3946 | break; | |
3947 | if (i >= st_dev_max) | |
3948 | panic("scsi_devices corrupt (st)"); | |
3949 | ||
3950 | tpnt = kmalloc(sizeof(struct scsi_tape), GFP_ATOMIC); | |
3951 | if (tpnt == NULL) { | |
3952 | write_unlock(&st_dev_arr_lock); | |
3953 | printk(KERN_ERR "st: Can't allocate device descriptor.\n"); | |
3954 | goto out_put_disk; | |
3955 | } | |
3956 | memset(tpnt, 0, sizeof(struct scsi_tape)); | |
f03a5670 | 3957 | kref_init(&tpnt->kref); |
1da177e4 LT |
3958 | tpnt->disk = disk; |
3959 | sprintf(disk->disk_name, "st%d", i); | |
3960 | disk->private_data = &tpnt->driver; | |
3961 | disk->queue = SDp->request_queue; | |
3962 | tpnt->driver = &st_template; | |
3963 | scsi_tapes[i] = tpnt; | |
3964 | dev_num = i; | |
3965 | ||
3966 | tpnt->device = SDp; | |
3967 | if (SDp->scsi_level <= 2) | |
3968 | tpnt->tape_type = MT_ISSCSI1; | |
3969 | else | |
3970 | tpnt->tape_type = MT_ISSCSI2; | |
3971 | ||
3972 | tpnt->buffer = buffer; | |
f03a5670 | 3973 | tpnt->buffer->last_SRpnt = NULL; |
1da177e4 LT |
3974 | |
3975 | tpnt->inited = 0; | |
3976 | tpnt->dirty = 0; | |
3977 | tpnt->in_use = 0; | |
3978 | tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ | |
3979 | tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; | |
3980 | tpnt->use_pf = (SDp->scsi_level >= SCSI_2); | |
3981 | tpnt->density = 0; | |
3982 | tpnt->do_auto_lock = ST_AUTO_LOCK; | |
3983 | tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ | |
3984 | tpnt->can_partitions = 0; | |
3985 | tpnt->two_fm = ST_TWO_FM; | |
3986 | tpnt->fast_mteom = ST_FAST_MTEOM; | |
3987 | tpnt->scsi2_logical = ST_SCSI2LOGICAL; | |
3988 | tpnt->immediate = ST_NOWAIT; | |
3989 | tpnt->default_drvbuffer = 0xff; /* No forced buffering */ | |
3990 | tpnt->partition = 0; | |
3991 | tpnt->new_partition = 0; | |
3992 | tpnt->nbr_partitions = 0; | |
3993 | tpnt->device->timeout = ST_TIMEOUT; | |
3994 | tpnt->long_timeout = ST_LONG_TIMEOUT; | |
3995 | tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; | |
3996 | ||
3997 | bounce_limit = scsi_calculate_bounce_limit(SDp->host) >> PAGE_SHIFT; | |
3998 | if (bounce_limit > ULONG_MAX) | |
3999 | bounce_limit = ULONG_MAX; | |
4000 | tpnt->max_pfn = bounce_limit; | |
4001 | ||
4002 | for (i = 0; i < ST_NBR_MODES; i++) { | |
4003 | STm = &(tpnt->modes[i]); | |
4004 | STm->defined = 0; | |
4005 | STm->sysv = ST_SYSV; | |
4006 | STm->defaults_for_writes = 0; | |
4007 | STm->do_async_writes = ST_ASYNC_WRITES; | |
4008 | STm->do_buffer_writes = ST_BUFFER_WRITES; | |
4009 | STm->do_read_ahead = ST_READ_AHEAD; | |
4010 | STm->default_compression = ST_DONT_TOUCH; | |
4011 | STm->default_blksize = (-1); /* No forced size */ | |
4012 | STm->default_density = (-1); /* No forced density */ | |
4013 | } | |
4014 | ||
4015 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
4016 | STps = &(tpnt->ps[i]); | |
4017 | STps->rw = ST_IDLE; | |
4018 | STps->eof = ST_NOEOF; | |
4019 | STps->at_sm = 0; | |
4020 | STps->last_block_valid = 0; | |
4021 | STps->drv_block = (-1); | |
4022 | STps->drv_file = (-1); | |
4023 | } | |
4024 | ||
4025 | tpnt->current_mode = 0; | |
4026 | tpnt->modes[0].defined = 1; | |
4027 | ||
4028 | tpnt->density_changed = tpnt->compression_changed = | |
4029 | tpnt->blksize_changed = 0; | |
4030 | init_MUTEX(&tpnt->lock); | |
4031 | ||
4032 | st_nr_dev++; | |
4033 | write_unlock(&st_dev_arr_lock); | |
4034 | ||
4035 | for (mode = 0; mode < ST_NBR_MODES; ++mode) { | |
4036 | STm = &(tpnt->modes[mode]); | |
4037 | for (j=0; j < 2; j++) { | |
4038 | cdev = cdev_alloc(); | |
4039 | if (!cdev) { | |
4040 | printk(KERN_ERR | |
4041 | "st%d: out of memory. Device not attached.\n", | |
4042 | dev_num); | |
4043 | goto out_free_tape; | |
4044 | } | |
4045 | cdev->owner = THIS_MODULE; | |
4046 | cdev->ops = &st_fops; | |
4047 | ||
4048 | error = cdev_add(cdev, | |
4049 | MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, j)), | |
4050 | 1); | |
4051 | if (error) { | |
4052 | printk(KERN_ERR "st%d: Can't add %s-rewind mode %d\n", | |
4053 | dev_num, j ? "non" : "auto", mode); | |
4054 | printk(KERN_ERR "st%d: Device not attached.\n", dev_num); | |
4055 | goto out_free_tape; | |
4056 | } | |
4057 | STm->cdevs[j] = cdev; | |
4058 | ||
4059 | } | |
4060 | do_create_class_files(tpnt, dev_num, mode); | |
4061 | } | |
4062 | ||
4063 | for (mode = 0; mode < ST_NBR_MODES; ++mode) { | |
4064 | /* Make sure that the minor numbers corresponding to the four | |
4065 | first modes always get the same names */ | |
4066 | i = mode << (4 - ST_NBR_MODE_BITS); | |
4067 | /* Rewind entry */ | |
4068 | devfs_mk_cdev(MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, 0)), | |
4069 | S_IFCHR | S_IRUGO | S_IWUGO, | |
4070 | "%s/mt%s", SDp->devfs_name, st_formats[i]); | |
4071 | /* No-rewind entry */ | |
4072 | devfs_mk_cdev(MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, 1)), | |
4073 | S_IFCHR | S_IRUGO | S_IWUGO, | |
4074 | "%s/mt%sn", SDp->devfs_name, st_formats[i]); | |
4075 | } | |
4076 | disk->number = devfs_register_tape(SDp->devfs_name); | |
4077 | ||
9ccfc756 JB |
4078 | sdev_printk(KERN_WARNING, SDp, |
4079 | "Attached scsi tape %s", tape_name(tpnt)); | |
1da177e4 LT |
4080 | printk(KERN_WARNING "%s: try direct i/o: %s (alignment %d B), max page reachable by HBA %lu\n", |
4081 | tape_name(tpnt), tpnt->try_dio ? "yes" : "no", | |
4082 | queue_dma_alignment(SDp->request_queue) + 1, tpnt->max_pfn); | |
4083 | ||
4084 | return 0; | |
4085 | ||
4086 | out_free_tape: | |
4087 | for (mode=0; mode < ST_NBR_MODES; mode++) { | |
4088 | STm = &(tpnt->modes[mode]); | |
4089 | sysfs_remove_link(&tpnt->device->sdev_gendev.kobj, | |
4090 | "tape"); | |
4091 | for (j=0; j < 2; j++) { | |
4092 | if (STm->cdevs[j]) { | |
4093 | if (cdev == STm->cdevs[j]) | |
4094 | cdev = NULL; | |
d253878b GKH |
4095 | class_device_destroy(st_sysfs_class, |
4096 | MKDEV(SCSI_TAPE_MAJOR, | |
4097 | TAPE_MINOR(i, mode, j))); | |
1da177e4 LT |
4098 | cdev_del(STm->cdevs[j]); |
4099 | } | |
4100 | } | |
4101 | } | |
4102 | if (cdev) | |
4103 | cdev_del(cdev); | |
4104 | write_lock(&st_dev_arr_lock); | |
4105 | scsi_tapes[dev_num] = NULL; | |
4106 | st_nr_dev--; | |
4107 | write_unlock(&st_dev_arr_lock); | |
4108 | out_put_disk: | |
4109 | put_disk(disk); | |
c9475cb0 | 4110 | kfree(tpnt); |
1da177e4 LT |
4111 | out_buffer_free: |
4112 | kfree(buffer); | |
4113 | out: | |
4114 | return -ENODEV; | |
4115 | }; | |
4116 | ||
4117 | ||
4118 | static int st_remove(struct device *dev) | |
4119 | { | |
4120 | struct scsi_device *SDp = to_scsi_device(dev); | |
4121 | struct scsi_tape *tpnt; | |
4122 | int i, j, mode; | |
4123 | ||
4124 | write_lock(&st_dev_arr_lock); | |
4125 | for (i = 0; i < st_dev_max; i++) { | |
4126 | tpnt = scsi_tapes[i]; | |
4127 | if (tpnt != NULL && tpnt->device == SDp) { | |
4128 | scsi_tapes[i] = NULL; | |
4129 | st_nr_dev--; | |
4130 | write_unlock(&st_dev_arr_lock); | |
4131 | devfs_unregister_tape(tpnt->disk->number); | |
4132 | sysfs_remove_link(&tpnt->device->sdev_gendev.kobj, | |
4133 | "tape"); | |
4134 | for (mode = 0; mode < ST_NBR_MODES; ++mode) { | |
4135 | j = mode << (4 - ST_NBR_MODE_BITS); | |
4136 | devfs_remove("%s/mt%s", SDp->devfs_name, st_formats[j]); | |
4137 | devfs_remove("%s/mt%sn", SDp->devfs_name, st_formats[j]); | |
4138 | for (j=0; j < 2; j++) { | |
d253878b GKH |
4139 | class_device_destroy(st_sysfs_class, |
4140 | MKDEV(SCSI_TAPE_MAJOR, | |
4141 | TAPE_MINOR(i, mode, j))); | |
1da177e4 LT |
4142 | cdev_del(tpnt->modes[mode].cdevs[j]); |
4143 | tpnt->modes[mode].cdevs[j] = NULL; | |
4144 | } | |
4145 | } | |
1da177e4 | 4146 | |
f03a5670 KM |
4147 | down(&st_ref_sem); |
4148 | kref_put(&tpnt->kref, scsi_tape_release); | |
4149 | up(&st_ref_sem); | |
1da177e4 LT |
4150 | return 0; |
4151 | } | |
4152 | } | |
4153 | ||
4154 | write_unlock(&st_dev_arr_lock); | |
4155 | return 0; | |
4156 | } | |
4157 | ||
f03a5670 KM |
4158 | /** |
4159 | * scsi_tape_release - Called to free the Scsi_Tape structure | |
4160 | * @kref: pointer to embedded kref | |
4161 | * | |
4162 | * st_ref_sem must be held entering this routine. Because it is | |
4163 | * called on last put, you should always use the scsi_tape_get() | |
4164 | * scsi_tape_put() helpers which manipulate the semaphore directly | |
4165 | * and never do a direct kref_put(). | |
4166 | **/ | |
4167 | static void scsi_tape_release(struct kref *kref) | |
4168 | { | |
4169 | struct scsi_tape *tpnt = to_scsi_tape(kref); | |
4170 | struct gendisk *disk = tpnt->disk; | |
4171 | ||
4172 | tpnt->device = NULL; | |
4173 | ||
4174 | if (tpnt->buffer) { | |
4175 | tpnt->buffer->orig_frp_segs = 0; | |
4176 | normalize_buffer(tpnt->buffer); | |
4177 | kfree(tpnt->buffer); | |
4178 | } | |
4179 | ||
4180 | disk->private_data = NULL; | |
4181 | put_disk(disk); | |
4182 | kfree(tpnt); | |
4183 | return; | |
4184 | } | |
4185 | ||
1da177e4 LT |
4186 | static void st_intr(struct scsi_cmnd *SCpnt) |
4187 | { | |
0d95716d MC |
4188 | /* |
4189 | * The caller should be checking the request's errors | |
4190 | * value. | |
4191 | */ | |
4192 | scsi_io_completion(SCpnt, SCpnt->bufflen, 0); | |
1da177e4 LT |
4193 | } |
4194 | ||
4195 | /* | |
4196 | * st_init_command: only called via the scsi_cmd_ioctl (block SG_IO) | |
4197 | * interface for REQ_BLOCK_PC commands. | |
4198 | */ | |
4199 | static int st_init_command(struct scsi_cmnd *SCpnt) | |
4200 | { | |
4201 | struct request *rq; | |
4202 | ||
4203 | if (!(SCpnt->request->flags & REQ_BLOCK_PC)) | |
4204 | return 0; | |
4205 | ||
4206 | rq = SCpnt->request; | |
4207 | if (sizeof(rq->cmd) > sizeof(SCpnt->cmnd)) | |
4208 | return 0; | |
4209 | ||
4210 | memcpy(SCpnt->cmnd, rq->cmd, sizeof(SCpnt->cmnd)); | |
186d330e | 4211 | SCpnt->cmd_len = rq->cmd_len; |
1da177e4 LT |
4212 | |
4213 | if (rq_data_dir(rq) == WRITE) | |
4214 | SCpnt->sc_data_direction = DMA_TO_DEVICE; | |
4215 | else if (rq->data_len) | |
4216 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; | |
4217 | else | |
4218 | SCpnt->sc_data_direction = DMA_NONE; | |
4219 | ||
4220 | SCpnt->timeout_per_command = rq->timeout; | |
4221 | SCpnt->transfersize = rq->data_len; | |
4222 | SCpnt->done = st_intr; | |
4223 | return 1; | |
4224 | } | |
4225 | ||
4226 | static int __init init_st(void) | |
4227 | { | |
4228 | validate_options(); | |
4229 | ||
4230 | printk(KERN_INFO | |
4231 | "st: Version %s, fixed bufsize %d, s/g segs %d\n", | |
4232 | verstr, st_fixed_buffer_size, st_max_sg_segs); | |
4233 | ||
d253878b | 4234 | st_sysfs_class = class_create(THIS_MODULE, "scsi_tape"); |
1da177e4 LT |
4235 | if (IS_ERR(st_sysfs_class)) { |
4236 | st_sysfs_class = NULL; | |
4237 | printk(KERN_ERR "Unable create sysfs class for SCSI tapes\n"); | |
4238 | return 1; | |
4239 | } | |
4240 | ||
4241 | if (!register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), | |
4242 | ST_MAX_TAPE_ENTRIES, "st")) { | |
4243 | if (scsi_register_driver(&st_template.gendrv) == 0) { | |
4244 | do_create_driverfs_files(); | |
4245 | return 0; | |
4246 | } | |
1da177e4 | 4247 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), |
1da177e4 LT |
4248 | ST_MAX_TAPE_ENTRIES); |
4249 | } | |
c2c96f46 | 4250 | class_destroy(st_sysfs_class); |
1da177e4 LT |
4251 | |
4252 | printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", SCSI_TAPE_MAJOR); | |
4253 | return 1; | |
4254 | } | |
4255 | ||
4256 | static void __exit exit_st(void) | |
4257 | { | |
1da177e4 LT |
4258 | do_remove_driverfs_files(); |
4259 | scsi_unregister_driver(&st_template.gendrv); | |
4260 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), | |
4261 | ST_MAX_TAPE_ENTRIES); | |
c2c96f46 | 4262 | class_destroy(st_sysfs_class); |
1da177e4 LT |
4263 | kfree(scsi_tapes); |
4264 | printk(KERN_INFO "st: Unloaded.\n"); | |
4265 | } | |
4266 | ||
4267 | module_init(init_st); | |
4268 | module_exit(exit_st); | |
4269 | ||
4270 | ||
4271 | /* The sysfs driver interface. Read-only at the moment */ | |
4272 | static ssize_t st_try_direct_io_show(struct device_driver *ddp, char *buf) | |
4273 | { | |
4274 | return snprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); | |
4275 | } | |
4276 | static DRIVER_ATTR(try_direct_io, S_IRUGO, st_try_direct_io_show, NULL); | |
4277 | ||
4278 | static ssize_t st_fixed_buffer_size_show(struct device_driver *ddp, char *buf) | |
4279 | { | |
4280 | return snprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); | |
4281 | } | |
4282 | static DRIVER_ATTR(fixed_buffer_size, S_IRUGO, st_fixed_buffer_size_show, NULL); | |
4283 | ||
4284 | static ssize_t st_max_sg_segs_show(struct device_driver *ddp, char *buf) | |
4285 | { | |
4286 | return snprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); | |
4287 | } | |
4288 | static DRIVER_ATTR(max_sg_segs, S_IRUGO, st_max_sg_segs_show, NULL); | |
4289 | ||
4290 | static ssize_t st_version_show(struct device_driver *ddd, char *buf) | |
4291 | { | |
4292 | return snprintf(buf, PAGE_SIZE, "[%s]\n", verstr); | |
4293 | } | |
4294 | static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL); | |
4295 | ||
4296 | static void do_create_driverfs_files(void) | |
4297 | { | |
4298 | struct device_driver *driverfs = &st_template.gendrv; | |
4299 | ||
4300 | driver_create_file(driverfs, &driver_attr_try_direct_io); | |
4301 | driver_create_file(driverfs, &driver_attr_fixed_buffer_size); | |
4302 | driver_create_file(driverfs, &driver_attr_max_sg_segs); | |
4303 | driver_create_file(driverfs, &driver_attr_version); | |
4304 | } | |
4305 | ||
4306 | static void do_remove_driverfs_files(void) | |
4307 | { | |
4308 | struct device_driver *driverfs = &st_template.gendrv; | |
4309 | ||
4310 | driver_remove_file(driverfs, &driver_attr_version); | |
4311 | driver_remove_file(driverfs, &driver_attr_max_sg_segs); | |
4312 | driver_remove_file(driverfs, &driver_attr_fixed_buffer_size); | |
4313 | driver_remove_file(driverfs, &driver_attr_try_direct_io); | |
4314 | } | |
4315 | ||
4316 | ||
4317 | /* The sysfs simple class interface */ | |
4318 | static ssize_t st_defined_show(struct class_device *class_dev, char *buf) | |
4319 | { | |
4320 | struct st_modedef *STm = (struct st_modedef *)class_get_devdata(class_dev); | |
4321 | ssize_t l = 0; | |
4322 | ||
4323 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); | |
4324 | return l; | |
4325 | } | |
4326 | ||
4327 | CLASS_DEVICE_ATTR(defined, S_IRUGO, st_defined_show, NULL); | |
4328 | ||
4329 | static ssize_t st_defblk_show(struct class_device *class_dev, char *buf) | |
4330 | { | |
4331 | struct st_modedef *STm = (struct st_modedef *)class_get_devdata(class_dev); | |
4332 | ssize_t l = 0; | |
4333 | ||
4334 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); | |
4335 | return l; | |
4336 | } | |
4337 | ||
4338 | CLASS_DEVICE_ATTR(default_blksize, S_IRUGO, st_defblk_show, NULL); | |
4339 | ||
4340 | static ssize_t st_defdensity_show(struct class_device *class_dev, char *buf) | |
4341 | { | |
4342 | struct st_modedef *STm = (struct st_modedef *)class_get_devdata(class_dev); | |
4343 | ssize_t l = 0; | |
4344 | char *fmt; | |
4345 | ||
4346 | fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; | |
4347 | l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); | |
4348 | return l; | |
4349 | } | |
4350 | ||
4351 | CLASS_DEVICE_ATTR(default_density, S_IRUGO, st_defdensity_show, NULL); | |
4352 | ||
4353 | static ssize_t st_defcompression_show(struct class_device *class_dev, char *buf) | |
4354 | { | |
4355 | struct st_modedef *STm = (struct st_modedef *)class_get_devdata(class_dev); | |
4356 | ssize_t l = 0; | |
4357 | ||
4358 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); | |
4359 | return l; | |
4360 | } | |
4361 | ||
4362 | CLASS_DEVICE_ATTR(default_compression, S_IRUGO, st_defcompression_show, NULL); | |
4363 | ||
4364 | static void do_create_class_files(struct scsi_tape *STp, int dev_num, int mode) | |
4365 | { | |
4366 | int i, rew, error; | |
4367 | char name[10]; | |
4368 | struct class_device *st_class_member; | |
4369 | ||
4370 | if (!st_sysfs_class) | |
4371 | return; | |
4372 | ||
4373 | for (rew=0; rew < 2; rew++) { | |
4374 | /* Make sure that the minor numbers corresponding to the four | |
4375 | first modes always get the same names */ | |
4376 | i = mode << (4 - ST_NBR_MODE_BITS); | |
4377 | snprintf(name, 10, "%s%s%s", rew ? "n" : "", | |
4378 | STp->disk->disk_name, st_formats[i]); | |
4379 | st_class_member = | |
53f46542 | 4380 | class_device_create(st_sysfs_class, NULL, |
d253878b GKH |
4381 | MKDEV(SCSI_TAPE_MAJOR, |
4382 | TAPE_MINOR(dev_num, mode, rew)), | |
4383 | &STp->device->sdev_gendev, "%s", name); | |
1da177e4 | 4384 | if (IS_ERR(st_class_member)) { |
d253878b | 4385 | printk(KERN_WARNING "st%d: class_device_create failed\n", |
1da177e4 LT |
4386 | dev_num); |
4387 | goto out; | |
4388 | } | |
4389 | class_set_devdata(st_class_member, &STp->modes[mode]); | |
4390 | ||
4391 | class_device_create_file(st_class_member, | |
4392 | &class_device_attr_defined); | |
4393 | class_device_create_file(st_class_member, | |
4394 | &class_device_attr_default_blksize); | |
4395 | class_device_create_file(st_class_member, | |
4396 | &class_device_attr_default_density); | |
4397 | class_device_create_file(st_class_member, | |
4398 | &class_device_attr_default_compression); | |
4399 | if (mode == 0 && rew == 0) { | |
4400 | error = sysfs_create_link(&STp->device->sdev_gendev.kobj, | |
4401 | &st_class_member->kobj, | |
4402 | "tape"); | |
4403 | if (error) { | |
4404 | printk(KERN_ERR | |
4405 | "st%d: Can't create sysfs link from SCSI device.\n", | |
4406 | dev_num); | |
4407 | } | |
4408 | } | |
4409 | } | |
4410 | out: | |
4411 | return; | |
4412 | } | |
4413 | ||
4414 | ||
4415 | /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if | |
4416 | - mapping of all pages not successful | |
4417 | - any page is above max_pfn | |
4418 | (i.e., either completely successful or fails) | |
4419 | */ | |
4420 | static int st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, | |
4421 | unsigned long uaddr, size_t count, int rw, | |
4422 | unsigned long max_pfn) | |
4423 | { | |
4424 | int i, nr_pages; | |
4425 | ||
4426 | nr_pages = sgl_map_user_pages(sgl, max_pages, uaddr, count, rw); | |
4427 | if (nr_pages <= 0) | |
4428 | return nr_pages; | |
4429 | ||
4430 | for (i=0; i < nr_pages; i++) { | |
4431 | if (page_to_pfn(sgl[i].page) > max_pfn) | |
4432 | goto out_unmap; | |
4433 | } | |
4434 | return nr_pages; | |
4435 | ||
4436 | out_unmap: | |
4437 | sgl_unmap_user_pages(sgl, nr_pages, 0); | |
4438 | return 0; | |
4439 | } | |
4440 | ||
4441 | ||
4442 | /* The following functions may be useful for a larger audience. */ | |
4443 | static int sgl_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, | |
4444 | unsigned long uaddr, size_t count, int rw) | |
4445 | { | |
07542b83 JB |
4446 | unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; |
4447 | unsigned long start = uaddr >> PAGE_SHIFT; | |
4448 | const int nr_pages = end - start; | |
1da177e4 | 4449 | int res, i, j; |
1da177e4 LT |
4450 | struct page **pages; |
4451 | ||
1da177e4 LT |
4452 | /* User attempted Overflow! */ |
4453 | if ((uaddr + count) < uaddr) | |
4454 | return -EINVAL; | |
4455 | ||
4456 | /* Too big */ | |
4457 | if (nr_pages > max_pages) | |
4458 | return -ENOMEM; | |
4459 | ||
4460 | /* Hmm? */ | |
4461 | if (count == 0) | |
4462 | return 0; | |
4463 | ||
4464 | if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL) | |
4465 | return -ENOMEM; | |
4466 | ||
4467 | /* Try to fault in all of the necessary pages */ | |
4468 | down_read(¤t->mm->mmap_sem); | |
4469 | /* rw==READ means read from drive, write into memory area */ | |
4470 | res = get_user_pages( | |
4471 | current, | |
4472 | current->mm, | |
4473 | uaddr, | |
4474 | nr_pages, | |
4475 | rw == READ, | |
4476 | 0, /* don't force */ | |
4477 | pages, | |
4478 | NULL); | |
4479 | up_read(¤t->mm->mmap_sem); | |
4480 | ||
4481 | /* Errors and no page mapped should return here */ | |
4482 | if (res < nr_pages) | |
4483 | goto out_unmap; | |
4484 | ||
4485 | for (i=0; i < nr_pages; i++) { | |
4486 | /* FIXME: flush superflous for rw==READ, | |
4487 | * probably wrong function for rw==WRITE | |
4488 | */ | |
4489 | flush_dcache_page(pages[i]); | |
4490 | } | |
4491 | ||
4492 | /* Populate the scatter/gather list */ | |
4493 | sgl[0].page = pages[0]; | |
4494 | sgl[0].offset = uaddr & ~PAGE_MASK; | |
4495 | if (nr_pages > 1) { | |
4496 | sgl[0].length = PAGE_SIZE - sgl[0].offset; | |
4497 | count -= sgl[0].length; | |
4498 | for (i=1; i < nr_pages ; i++) { | |
4499 | sgl[i].offset = 0; | |
4500 | sgl[i].page = pages[i]; | |
4501 | sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE; | |
4502 | count -= PAGE_SIZE; | |
4503 | } | |
4504 | } | |
4505 | else { | |
4506 | sgl[0].length = count; | |
4507 | } | |
4508 | ||
4509 | kfree(pages); | |
4510 | return nr_pages; | |
4511 | ||
4512 | out_unmap: | |
4513 | if (res > 0) { | |
4514 | for (j=0; j < res; j++) | |
4515 | page_cache_release(pages[j]); | |
6bc733e9 | 4516 | res = 0; |
1da177e4 LT |
4517 | } |
4518 | kfree(pages); | |
4519 | return res; | |
4520 | } | |
4521 | ||
4522 | ||
4523 | /* And unmap them... */ | |
4524 | static int sgl_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, | |
4525 | int dirtied) | |
4526 | { | |
4527 | int i; | |
4528 | ||
4529 | for (i=0; i < nr_pages; i++) { | |
b5810039 NP |
4530 | struct page *page = sgl[i].page; |
4531 | ||
b5810039 NP |
4532 | if (dirtied) |
4533 | SetPageDirty(page); | |
1da177e4 LT |
4534 | /* FIXME: cache flush missing for rw==READ |
4535 | * FIXME: call the correct reference counting function | |
4536 | */ | |
b5810039 | 4537 | page_cache_release(page); |
1da177e4 LT |
4538 | } |
4539 | ||
4540 | return 0; | |
4541 | } |