Root/
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 - 2008 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 | |
20 | static const char *verstr = "20081215"; |
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/slab.h> |
31 | #include <linux/errno.h> |
32 | #include <linux/mtio.h> |
33 | #include <linux/cdrom.h> |
34 | #include <linux/ioctl.h> |
35 | #include <linux/fcntl.h> |
36 | #include <linux/spinlock.h> |
37 | #include <linux/blkdev.h> |
38 | #include <linux/moduleparam.h> |
39 | #include <linux/cdev.h> |
40 | #include <linux/delay.h> |
41 | #include <linux/mutex.h> |
42 | #include <linux/smp_lock.h> |
43 | |
44 | #include <asm/uaccess.h> |
45 | #include <asm/dma.h> |
46 | #include <asm/system.h> |
47 | |
48 | #include <scsi/scsi.h> |
49 | #include <scsi/scsi_dbg.h> |
50 | #include <scsi/scsi_device.h> |
51 | #include <scsi/scsi_driver.h> |
52 | #include <scsi/scsi_eh.h> |
53 | #include <scsi/scsi_host.h> |
54 | #include <scsi/scsi_ioctl.h> |
55 | #include <scsi/sg.h> |
56 | |
57 | |
58 | /* The driver prints some debugging information on the console if DEBUG |
59 | is defined and non-zero. */ |
60 | #define DEBUG 0 |
61 | |
62 | #if DEBUG |
63 | /* The message level for the debug messages is currently set to KERN_NOTICE |
64 | so that people can easily see the messages. Later when the debugging messages |
65 | in the drivers are more widely classified, this may be changed to KERN_DEBUG. */ |
66 | #define ST_DEB_MSG KERN_NOTICE |
67 | #define DEB(a) a |
68 | #define DEBC(a) if (debugging) { a ; } |
69 | #else |
70 | #define DEB(a) |
71 | #define DEBC(a) |
72 | #endif |
73 | |
74 | #define ST_KILOBYTE 1024 |
75 | |
76 | #include "st_options.h" |
77 | #include "st.h" |
78 | |
79 | static int buffer_kbs; |
80 | static int max_sg_segs; |
81 | static int try_direct_io = TRY_DIRECT_IO; |
82 | static int try_rdio = 1; |
83 | static int try_wdio = 1; |
84 | |
85 | static int st_dev_max; |
86 | static int st_nr_dev; |
87 | |
88 | static struct class *st_sysfs_class; |
89 | |
90 | MODULE_AUTHOR("Kai Makisara"); |
91 | MODULE_DESCRIPTION("SCSI tape (st) driver"); |
92 | MODULE_LICENSE("GPL"); |
93 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR); |
94 | MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE); |
95 | |
96 | /* Set 'perm' (4th argument) to 0 to disable module_param's definition |
97 | * of sysfs parameters (which module_param doesn't yet support). |
98 | * Sysfs parameters defined explicitly later. |
99 | */ |
100 | module_param_named(buffer_kbs, buffer_kbs, int, 0); |
101 | MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)"); |
102 | module_param_named(max_sg_segs, max_sg_segs, int, 0); |
103 | MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)"); |
104 | module_param_named(try_direct_io, try_direct_io, int, 0); |
105 | MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)"); |
106 | |
107 | /* Extra parameters for testing */ |
108 | module_param_named(try_rdio, try_rdio, int, 0); |
109 | MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); |
110 | module_param_named(try_wdio, try_wdio, int, 0); |
111 | MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); |
112 | |
113 | #ifndef MODULE |
114 | static int write_threshold_kbs; /* retained for compatibility */ |
115 | static struct st_dev_parm { |
116 | char *name; |
117 | int *val; |
118 | } parms[] __initdata = { |
119 | { |
120 | "buffer_kbs", &buffer_kbs |
121 | }, |
122 | { /* Retained for compatibility with 2.4 */ |
123 | "write_threshold_kbs", &write_threshold_kbs |
124 | }, |
125 | { |
126 | "max_sg_segs", NULL |
127 | }, |
128 | { |
129 | "try_direct_io", &try_direct_io |
130 | } |
131 | }; |
132 | #endif |
133 | |
134 | /* Restrict the number of modes so that names for all are assigned */ |
135 | #if ST_NBR_MODES > 16 |
136 | #error "Maximum number of modes is 16" |
137 | #endif |
138 | /* Bit reversed order to get same names for same minors with all |
139 | mode counts */ |
140 | static const char *st_formats[] = { |
141 | "", "r", "k", "s", "l", "t", "o", "u", |
142 | "m", "v", "p", "x", "a", "y", "q", "z"}; |
143 | |
144 | /* The default definitions have been moved to st_options.h */ |
145 | |
146 | #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) |
147 | |
148 | /* The buffer size should fit into the 24 bits for length in the |
149 | 6-byte SCSI read and write commands. */ |
150 | #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) |
151 | #error "Buffer size should not exceed (2 << 24 - 1) bytes!" |
152 | #endif |
153 | |
154 | static int debugging = DEBUG; |
155 | |
156 | #define MAX_RETRIES 0 |
157 | #define MAX_WRITE_RETRIES 0 |
158 | #define MAX_READY_RETRIES 0 |
159 | #define NO_TAPE NOT_READY |
160 | |
161 | #define ST_TIMEOUT (900 * HZ) |
162 | #define ST_LONG_TIMEOUT (14000 * HZ) |
163 | |
164 | /* Remove mode bits and auto-rewind bit (7) */ |
165 | #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ |
166 | (iminor(x) & ~(-1 << ST_MODE_SHIFT)) ) |
167 | #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) |
168 | |
169 | /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ |
170 | #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ |
171 | (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) |
172 | |
173 | /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower |
174 | 24 bits) */ |
175 | #define SET_DENS_AND_BLK 0x10001 |
176 | |
177 | static DEFINE_RWLOCK(st_dev_arr_lock); |
178 | |
179 | static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; |
180 | static int st_max_sg_segs = ST_MAX_SG; |
181 | |
182 | static struct scsi_tape **scsi_tapes = NULL; |
183 | |
184 | static int modes_defined; |
185 | |
186 | static int enlarge_buffer(struct st_buffer *, int, int); |
187 | static void clear_buffer(struct st_buffer *); |
188 | static void normalize_buffer(struct st_buffer *); |
189 | static int append_to_buffer(const char __user *, struct st_buffer *, int); |
190 | static int from_buffer(struct st_buffer *, char __user *, int); |
191 | static void move_buffer_data(struct st_buffer *, int); |
192 | |
193 | static int sgl_map_user_pages(struct st_buffer *, const unsigned int, |
194 | unsigned long, size_t, int); |
195 | static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int); |
196 | |
197 | static int st_probe(struct device *); |
198 | static int st_remove(struct device *); |
199 | |
200 | static int do_create_sysfs_files(void); |
201 | static void do_remove_sysfs_files(void); |
202 | static int do_create_class_files(struct scsi_tape *, int, int); |
203 | |
204 | static struct scsi_driver st_template = { |
205 | .owner = THIS_MODULE, |
206 | .gendrv = { |
207 | .name = "st", |
208 | .probe = st_probe, |
209 | .remove = st_remove, |
210 | }, |
211 | }; |
212 | |
213 | static int st_compression(struct scsi_tape *, int); |
214 | |
215 | static int find_partition(struct scsi_tape *); |
216 | static int switch_partition(struct scsi_tape *); |
217 | |
218 | static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); |
219 | |
220 | static void scsi_tape_release(struct kref *); |
221 | |
222 | #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref) |
223 | |
224 | static DEFINE_MUTEX(st_ref_mutex); |
225 | |
226 | |
227 | #include "osst_detect.h" |
228 | #ifndef SIGS_FROM_OSST |
229 | #define SIGS_FROM_OSST \ |
230 | {"OnStream", "SC-", "", "osst"}, \ |
231 | {"OnStream", "DI-", "", "osst"}, \ |
232 | {"OnStream", "DP-", "", "osst"}, \ |
233 | {"OnStream", "USB", "", "osst"}, \ |
234 | {"OnStream", "FW-", "", "osst"} |
235 | #endif |
236 | |
237 | static struct scsi_tape *scsi_tape_get(int dev) |
238 | { |
239 | struct scsi_tape *STp = NULL; |
240 | |
241 | mutex_lock(&st_ref_mutex); |
242 | write_lock(&st_dev_arr_lock); |
243 | |
244 | if (dev < st_dev_max && scsi_tapes != NULL) |
245 | STp = scsi_tapes[dev]; |
246 | if (!STp) goto out; |
247 | |
248 | kref_get(&STp->kref); |
249 | |
250 | if (!STp->device) |
251 | goto out_put; |
252 | |
253 | if (scsi_device_get(STp->device)) |
254 | goto out_put; |
255 | |
256 | goto out; |
257 | |
258 | out_put: |
259 | kref_put(&STp->kref, scsi_tape_release); |
260 | STp = NULL; |
261 | out: |
262 | write_unlock(&st_dev_arr_lock); |
263 | mutex_unlock(&st_ref_mutex); |
264 | return STp; |
265 | } |
266 | |
267 | static void scsi_tape_put(struct scsi_tape *STp) |
268 | { |
269 | struct scsi_device *sdev = STp->device; |
270 | |
271 | mutex_lock(&st_ref_mutex); |
272 | kref_put(&STp->kref, scsi_tape_release); |
273 | scsi_device_put(sdev); |
274 | mutex_unlock(&st_ref_mutex); |
275 | } |
276 | |
277 | struct st_reject_data { |
278 | char *vendor; |
279 | char *model; |
280 | char *rev; |
281 | char *driver_hint; /* Name of the correct driver, NULL if unknown */ |
282 | }; |
283 | |
284 | static struct st_reject_data reject_list[] = { |
285 | /* {"XXX", "Yy-", "", NULL}, example */ |
286 | SIGS_FROM_OSST, |
287 | {NULL, }}; |
288 | |
289 | /* If the device signature is on the list of incompatible drives, the |
290 | function returns a pointer to the name of the correct driver (if known) */ |
291 | static char * st_incompatible(struct scsi_device* SDp) |
292 | { |
293 | struct st_reject_data *rp; |
294 | |
295 | for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) |
296 | if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && |
297 | !strncmp(rp->model, SDp->model, strlen(rp->model)) && |
298 | !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { |
299 | if (rp->driver_hint) |
300 | return rp->driver_hint; |
301 | else |
302 | return "unknown"; |
303 | } |
304 | return NULL; |
305 | } |
306 | |
307 | |
308 | static inline char *tape_name(struct scsi_tape *tape) |
309 | { |
310 | return tape->disk->disk_name; |
311 | } |
312 | |
313 | |
314 | static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s) |
315 | { |
316 | const u8 *ucp; |
317 | const u8 *sense = SRpnt->sense; |
318 | |
319 | s->have_sense = scsi_normalize_sense(SRpnt->sense, |
320 | SCSI_SENSE_BUFFERSIZE, &s->sense_hdr); |
321 | s->flags = 0; |
322 | |
323 | if (s->have_sense) { |
324 | s->deferred = 0; |
325 | s->remainder_valid = |
326 | scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); |
327 | switch (sense[0] & 0x7f) { |
328 | case 0x71: |
329 | s->deferred = 1; |
330 | case 0x70: |
331 | s->fixed_format = 1; |
332 | s->flags = sense[2] & 0xe0; |
333 | break; |
334 | case 0x73: |
335 | s->deferred = 1; |
336 | case 0x72: |
337 | s->fixed_format = 0; |
338 | ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); |
339 | s->flags = ucp ? (ucp[3] & 0xe0) : 0; |
340 | break; |
341 | } |
342 | } |
343 | } |
344 | |
345 | |
346 | /* Convert the result to success code */ |
347 | static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt) |
348 | { |
349 | int result = SRpnt->result; |
350 | u8 scode; |
351 | DEB(const char *stp;) |
352 | char *name = tape_name(STp); |
353 | struct st_cmdstatus *cmdstatp; |
354 | |
355 | if (!result) |
356 | return 0; |
357 | |
358 | cmdstatp = &STp->buffer->cmdstat; |
359 | st_analyze_sense(SRpnt, cmdstatp); |
360 | |
361 | if (cmdstatp->have_sense) |
362 | scode = STp->buffer->cmdstat.sense_hdr.sense_key; |
363 | else |
364 | scode = 0; |
365 | |
366 | DEB( |
367 | if (debugging) { |
368 | printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x\n", |
369 | name, result, |
370 | SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2], |
371 | SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]); |
372 | if (cmdstatp->have_sense) |
373 | __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE); |
374 | } ) /* end DEB */ |
375 | if (!debugging) { /* Abnormal conditions for tape */ |
376 | if (!cmdstatp->have_sense) |
377 | printk(KERN_WARNING |
378 | "%s: Error %x (driver bt 0x%x, host bt 0x%x).\n", |
379 | name, result, driver_byte(result), |
380 | host_byte(result)); |
381 | else if (cmdstatp->have_sense && |
382 | scode != NO_SENSE && |
383 | scode != RECOVERED_ERROR && |
384 | /* scode != UNIT_ATTENTION && */ |
385 | scode != BLANK_CHECK && |
386 | scode != VOLUME_OVERFLOW && |
387 | SRpnt->cmd[0] != MODE_SENSE && |
388 | SRpnt->cmd[0] != TEST_UNIT_READY) { |
389 | |
390 | __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE); |
391 | } |
392 | } |
393 | |
394 | if (cmdstatp->fixed_format && |
395 | STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ |
396 | if (STp->cln_sense_value) |
397 | STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & |
398 | STp->cln_sense_mask) == STp->cln_sense_value); |
399 | else |
400 | STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & |
401 | STp->cln_sense_mask) != 0); |
402 | } |
403 | if (cmdstatp->have_sense && |
404 | cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17) |
405 | STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */ |
406 | |
407 | STp->pos_unknown |= STp->device->was_reset; |
408 | |
409 | if (cmdstatp->have_sense && |
410 | scode == RECOVERED_ERROR |
411 | #if ST_RECOVERED_WRITE_FATAL |
412 | && SRpnt->cmd[0] != WRITE_6 |
413 | && SRpnt->cmd[0] != WRITE_FILEMARKS |
414 | #endif |
415 | ) { |
416 | STp->recover_count++; |
417 | STp->recover_reg++; |
418 | |
419 | DEB( |
420 | if (debugging) { |
421 | if (SRpnt->cmd[0] == READ_6) |
422 | stp = "read"; |
423 | else if (SRpnt->cmd[0] == WRITE_6) |
424 | stp = "write"; |
425 | else |
426 | stp = "ioctl"; |
427 | printk(ST_DEB_MSG "%s: Recovered %s error (%d).\n", name, stp, |
428 | STp->recover_count); |
429 | } ) /* end DEB */ |
430 | |
431 | if (cmdstatp->flags == 0) |
432 | return 0; |
433 | } |
434 | return (-EIO); |
435 | } |
436 | |
437 | static struct st_request *st_allocate_request(struct scsi_tape *stp) |
438 | { |
439 | struct st_request *streq; |
440 | |
441 | streq = kzalloc(sizeof(*streq), GFP_KERNEL); |
442 | if (streq) |
443 | streq->stp = stp; |
444 | else { |
445 | DEBC(printk(KERN_ERR "%s: Can't get SCSI request.\n", |
446 | tape_name(stp));); |
447 | if (signal_pending(current)) |
448 | stp->buffer->syscall_result = -EINTR; |
449 | else |
450 | stp->buffer->syscall_result = -EBUSY; |
451 | } |
452 | |
453 | return streq; |
454 | } |
455 | |
456 | static void st_release_request(struct st_request *streq) |
457 | { |
458 | kfree(streq); |
459 | } |
460 | |
461 | static void st_scsi_execute_end(struct request *req, int uptodate) |
462 | { |
463 | struct st_request *SRpnt = req->end_io_data; |
464 | struct scsi_tape *STp = SRpnt->stp; |
465 | |
466 | STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors; |
467 | STp->buffer->cmdstat.residual = req->resid_len; |
468 | |
469 | if (SRpnt->waiting) |
470 | complete(SRpnt->waiting); |
471 | |
472 | blk_rq_unmap_user(SRpnt->bio); |
473 | __blk_put_request(req->q, req); |
474 | } |
475 | |
476 | static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, |
477 | int data_direction, void *buffer, unsigned bufflen, |
478 | int timeout, int retries) |
479 | { |
480 | struct request *req; |
481 | struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data; |
482 | int err = 0; |
483 | int write = (data_direction == DMA_TO_DEVICE); |
484 | |
485 | req = blk_get_request(SRpnt->stp->device->request_queue, write, |
486 | GFP_KERNEL); |
487 | if (!req) |
488 | return DRIVER_ERROR << 24; |
489 | |
490 | req->cmd_type = REQ_TYPE_BLOCK_PC; |
491 | req->cmd_flags |= REQ_QUIET; |
492 | |
493 | mdata->null_mapped = 1; |
494 | |
495 | if (bufflen) { |
496 | err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, |
497 | GFP_KERNEL); |
498 | if (err) { |
499 | blk_put_request(req); |
500 | return DRIVER_ERROR << 24; |
501 | } |
502 | } |
503 | |
504 | SRpnt->bio = req->bio; |
505 | req->cmd_len = COMMAND_SIZE(cmd[0]); |
506 | memset(req->cmd, 0, BLK_MAX_CDB); |
507 | memcpy(req->cmd, cmd, req->cmd_len); |
508 | req->sense = SRpnt->sense; |
509 | req->sense_len = 0; |
510 | req->timeout = timeout; |
511 | req->retries = retries; |
512 | req->end_io_data = SRpnt; |
513 | |
514 | blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end); |
515 | return 0; |
516 | } |
517 | |
518 | /* Do the scsi command. Waits until command performed if do_wait is true. |
519 | Otherwise write_behind_check() is used to check that the command |
520 | has finished. */ |
521 | static struct st_request * |
522 | st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, |
523 | int bytes, int direction, int timeout, int retries, int do_wait) |
524 | { |
525 | struct completion *waiting; |
526 | struct rq_map_data *mdata = &STp->buffer->map_data; |
527 | int ret; |
528 | |
529 | /* if async, make sure there's no command outstanding */ |
530 | if (!do_wait && ((STp->buffer)->last_SRpnt)) { |
531 | printk(KERN_ERR "%s: Async command already active.\n", |
532 | tape_name(STp)); |
533 | if (signal_pending(current)) |
534 | (STp->buffer)->syscall_result = (-EINTR); |
535 | else |
536 | (STp->buffer)->syscall_result = (-EBUSY); |
537 | return NULL; |
538 | } |
539 | |
540 | if (!SRpnt) { |
541 | SRpnt = st_allocate_request(STp); |
542 | if (!SRpnt) |
543 | return NULL; |
544 | } |
545 | |
546 | /* If async IO, set last_SRpnt. This ptr tells write_behind_check |
547 | which IO is outstanding. It's nulled out when the IO completes. */ |
548 | if (!do_wait) |
549 | (STp->buffer)->last_SRpnt = SRpnt; |
550 | |
551 | waiting = &STp->wait; |
552 | init_completion(waiting); |
553 | SRpnt->waiting = waiting; |
554 | |
555 | if (STp->buffer->do_dio) { |
556 | mdata->page_order = 0; |
557 | mdata->nr_entries = STp->buffer->sg_segs; |
558 | mdata->pages = STp->buffer->mapped_pages; |
559 | } else { |
560 | mdata->page_order = STp->buffer->reserved_page_order; |
561 | mdata->nr_entries = |
562 | DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order); |
563 | mdata->pages = STp->buffer->reserved_pages; |
564 | mdata->offset = 0; |
565 | } |
566 | |
567 | memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd)); |
568 | STp->buffer->cmdstat.have_sense = 0; |
569 | STp->buffer->syscall_result = 0; |
570 | |
571 | ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout, |
572 | retries); |
573 | if (ret) { |
574 | /* could not allocate the buffer or request was too large */ |
575 | (STp->buffer)->syscall_result = (-EBUSY); |
576 | (STp->buffer)->last_SRpnt = NULL; |
577 | } else if (do_wait) { |
578 | wait_for_completion(waiting); |
579 | SRpnt->waiting = NULL; |
580 | (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); |
581 | } |
582 | |
583 | return SRpnt; |
584 | } |
585 | |
586 | |
587 | /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if |
588 | write has been correct but EOM early warning reached, -EIO if write ended in |
589 | error or zero if write successful. Asynchronous writes are used only in |
590 | variable block mode. */ |
591 | static int write_behind_check(struct scsi_tape * STp) |
592 | { |
593 | int retval = 0; |
594 | struct st_buffer *STbuffer; |
595 | struct st_partstat *STps; |
596 | struct st_cmdstatus *cmdstatp; |
597 | struct st_request *SRpnt; |
598 | |
599 | STbuffer = STp->buffer; |
600 | if (!STbuffer->writing) |
601 | return 0; |
602 | |
603 | DEB( |
604 | if (STp->write_pending) |
605 | STp->nbr_waits++; |
606 | else |
607 | STp->nbr_finished++; |
608 | ) /* end DEB */ |
609 | |
610 | wait_for_completion(&(STp->wait)); |
611 | SRpnt = STbuffer->last_SRpnt; |
612 | STbuffer->last_SRpnt = NULL; |
613 | SRpnt->waiting = NULL; |
614 | |
615 | (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); |
616 | st_release_request(SRpnt); |
617 | |
618 | STbuffer->buffer_bytes -= STbuffer->writing; |
619 | STps = &(STp->ps[STp->partition]); |
620 | if (STps->drv_block >= 0) { |
621 | if (STp->block_size == 0) |
622 | STps->drv_block++; |
623 | else |
624 | STps->drv_block += STbuffer->writing / STp->block_size; |
625 | } |
626 | |
627 | cmdstatp = &STbuffer->cmdstat; |
628 | if (STbuffer->syscall_result) { |
629 | retval = -EIO; |
630 | if (cmdstatp->have_sense && !cmdstatp->deferred && |
631 | (cmdstatp->flags & SENSE_EOM) && |
632 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || |
633 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) { |
634 | /* EOM at write-behind, has all data been written? */ |
635 | if (!cmdstatp->remainder_valid || |
636 | cmdstatp->uremainder64 == 0) |
637 | retval = -ENOSPC; |
638 | } |
639 | if (retval == -EIO) |
640 | STps->drv_block = -1; |
641 | } |
642 | STbuffer->writing = 0; |
643 | |
644 | DEB(if (debugging && retval) |
645 | printk(ST_DEB_MSG "%s: Async write error %x, return value %d.\n", |
646 | tape_name(STp), STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */ |
647 | |
648 | return retval; |
649 | } |
650 | |
651 | |
652 | /* Step over EOF if it has been inadvertently crossed (ioctl not used because |
653 | it messes up the block number). */ |
654 | static int cross_eof(struct scsi_tape * STp, int forward) |
655 | { |
656 | struct st_request *SRpnt; |
657 | unsigned char cmd[MAX_COMMAND_SIZE]; |
658 | |
659 | cmd[0] = SPACE; |
660 | cmd[1] = 0x01; /* Space FileMarks */ |
661 | if (forward) { |
662 | cmd[2] = cmd[3] = 0; |
663 | cmd[4] = 1; |
664 | } else |
665 | cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ |
666 | cmd[5] = 0; |
667 | |
668 | DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n", |
669 | tape_name(STp), forward ? "forward" : "backward")); |
670 | |
671 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
672 | STp->device->request_queue->rq_timeout, |
673 | MAX_RETRIES, 1); |
674 | if (!SRpnt) |
675 | return (STp->buffer)->syscall_result; |
676 | |
677 | st_release_request(SRpnt); |
678 | SRpnt = NULL; |
679 | |
680 | if ((STp->buffer)->cmdstat.midlevel_result != 0) |
681 | printk(KERN_ERR "%s: Stepping over filemark %s failed.\n", |
682 | tape_name(STp), forward ? "forward" : "backward"); |
683 | |
684 | return (STp->buffer)->syscall_result; |
685 | } |
686 | |
687 | |
688 | /* Flush the write buffer (never need to write if variable blocksize). */ |
689 | static int st_flush_write_buffer(struct scsi_tape * STp) |
690 | { |
691 | int transfer, blks; |
692 | int result; |
693 | unsigned char cmd[MAX_COMMAND_SIZE]; |
694 | struct st_request *SRpnt; |
695 | struct st_partstat *STps; |
696 | |
697 | result = write_behind_check(STp); |
698 | if (result) |
699 | return result; |
700 | |
701 | result = 0; |
702 | if (STp->dirty == 1) { |
703 | |
704 | transfer = STp->buffer->buffer_bytes; |
705 | DEBC(printk(ST_DEB_MSG "%s: Flushing %d bytes.\n", |
706 | tape_name(STp), transfer)); |
707 | |
708 | memset(cmd, 0, MAX_COMMAND_SIZE); |
709 | cmd[0] = WRITE_6; |
710 | cmd[1] = 1; |
711 | blks = transfer / STp->block_size; |
712 | cmd[2] = blks >> 16; |
713 | cmd[3] = blks >> 8; |
714 | cmd[4] = blks; |
715 | |
716 | SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE, |
717 | STp->device->request_queue->rq_timeout, |
718 | MAX_WRITE_RETRIES, 1); |
719 | if (!SRpnt) |
720 | return (STp->buffer)->syscall_result; |
721 | |
722 | STps = &(STp->ps[STp->partition]); |
723 | if ((STp->buffer)->syscall_result != 0) { |
724 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; |
725 | |
726 | if (cmdstatp->have_sense && !cmdstatp->deferred && |
727 | (cmdstatp->flags & SENSE_EOM) && |
728 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || |
729 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && |
730 | (!cmdstatp->remainder_valid || |
731 | cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */ |
732 | STp->dirty = 0; |
733 | (STp->buffer)->buffer_bytes = 0; |
734 | if (STps->drv_block >= 0) |
735 | STps->drv_block += blks; |
736 | result = (-ENOSPC); |
737 | } else { |
738 | printk(KERN_ERR "%s: Error on flush.\n", |
739 | tape_name(STp)); |
740 | STps->drv_block = (-1); |
741 | result = (-EIO); |
742 | } |
743 | } else { |
744 | if (STps->drv_block >= 0) |
745 | STps->drv_block += blks; |
746 | STp->dirty = 0; |
747 | (STp->buffer)->buffer_bytes = 0; |
748 | } |
749 | st_release_request(SRpnt); |
750 | SRpnt = NULL; |
751 | } |
752 | return result; |
753 | } |
754 | |
755 | |
756 | /* Flush the tape buffer. The tape will be positioned correctly unless |
757 | seek_next is true. */ |
758 | static int flush_buffer(struct scsi_tape *STp, int seek_next) |
759 | { |
760 | int backspace, result; |
761 | struct st_buffer *STbuffer; |
762 | struct st_partstat *STps; |
763 | |
764 | STbuffer = STp->buffer; |
765 | |
766 | /* |
767 | * If there was a bus reset, block further access |
768 | * to this device. |
769 | */ |
770 | if (STp->pos_unknown) |
771 | return (-EIO); |
772 | |
773 | if (STp->ready != ST_READY) |
774 | return 0; |
775 | STps = &(STp->ps[STp->partition]); |
776 | if (STps->rw == ST_WRITING) /* Writing */ |
777 | return st_flush_write_buffer(STp); |
778 | |
779 | if (STp->block_size == 0) |
780 | return 0; |
781 | |
782 | backspace = ((STp->buffer)->buffer_bytes + |
783 | (STp->buffer)->read_pointer) / STp->block_size - |
784 | ((STp->buffer)->read_pointer + STp->block_size - 1) / |
785 | STp->block_size; |
786 | (STp->buffer)->buffer_bytes = 0; |
787 | (STp->buffer)->read_pointer = 0; |
788 | result = 0; |
789 | if (!seek_next) { |
790 | if (STps->eof == ST_FM_HIT) { |
791 | result = cross_eof(STp, 0); /* Back over the EOF hit */ |
792 | if (!result) |
793 | STps->eof = ST_NOEOF; |
794 | else { |
795 | if (STps->drv_file >= 0) |
796 | STps->drv_file++; |
797 | STps->drv_block = 0; |
798 | } |
799 | } |
800 | if (!result && backspace > 0) |
801 | result = st_int_ioctl(STp, MTBSR, backspace); |
802 | } else if (STps->eof == ST_FM_HIT) { |
803 | if (STps->drv_file >= 0) |
804 | STps->drv_file++; |
805 | STps->drv_block = 0; |
806 | STps->eof = ST_NOEOF; |
807 | } |
808 | return result; |
809 | |
810 | } |
811 | |
812 | /* Set the mode parameters */ |
813 | static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm) |
814 | { |
815 | int set_it = 0; |
816 | unsigned long arg; |
817 | char *name = tape_name(STp); |
818 | |
819 | if (!STp->density_changed && |
820 | STm->default_density >= 0 && |
821 | STm->default_density != STp->density) { |
822 | arg = STm->default_density; |
823 | set_it = 1; |
824 | } else |
825 | arg = STp->density; |
826 | arg <<= MT_ST_DENSITY_SHIFT; |
827 | if (!STp->blksize_changed && |
828 | STm->default_blksize >= 0 && |
829 | STm->default_blksize != STp->block_size) { |
830 | arg |= STm->default_blksize; |
831 | set_it = 1; |
832 | } else |
833 | arg |= STp->block_size; |
834 | if (set_it && |
835 | st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) { |
836 | printk(KERN_WARNING |
837 | "%s: Can't set default block size to %d bytes and density %x.\n", |
838 | name, STm->default_blksize, STm->default_density); |
839 | if (modes_defined) |
840 | return (-EINVAL); |
841 | } |
842 | return 0; |
843 | } |
844 | |
845 | |
846 | /* Lock or unlock the drive door. Don't use when st_request allocated. */ |
847 | static int do_door_lock(struct scsi_tape * STp, int do_lock) |
848 | { |
849 | int retval, cmd; |
850 | DEB(char *name = tape_name(STp);) |
851 | |
852 | |
853 | cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK; |
854 | DEBC(printk(ST_DEB_MSG "%s: %socking drive door.\n", name, |
855 | do_lock ? "L" : "Unl")); |
856 | retval = scsi_ioctl(STp->device, cmd, NULL); |
857 | if (!retval) { |
858 | STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; |
859 | } |
860 | else { |
861 | STp->door_locked = ST_LOCK_FAILS; |
862 | } |
863 | return retval; |
864 | } |
865 | |
866 | |
867 | /* Set the internal state after reset */ |
868 | static void reset_state(struct scsi_tape *STp) |
869 | { |
870 | int i; |
871 | struct st_partstat *STps; |
872 | |
873 | STp->pos_unknown = 0; |
874 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { |
875 | STps = &(STp->ps[i]); |
876 | STps->rw = ST_IDLE; |
877 | STps->eof = ST_NOEOF; |
878 | STps->at_sm = 0; |
879 | STps->last_block_valid = 0; |
880 | STps->drv_block = -1; |
881 | STps->drv_file = -1; |
882 | } |
883 | if (STp->can_partitions) { |
884 | STp->partition = find_partition(STp); |
885 | if (STp->partition < 0) |
886 | STp->partition = 0; |
887 | STp->new_partition = STp->partition; |
888 | } |
889 | } |
890 | |
891 | /* Test if the drive is ready. Returns either one of the codes below or a negative system |
892 | error code. */ |
893 | #define CHKRES_READY 0 |
894 | #define CHKRES_NEW_SESSION 1 |
895 | #define CHKRES_NOT_READY 2 |
896 | #define CHKRES_NO_TAPE 3 |
897 | |
898 | #define MAX_ATTENTIONS 10 |
899 | |
900 | static int test_ready(struct scsi_tape *STp, int do_wait) |
901 | { |
902 | int attentions, waits, max_wait, scode; |
903 | int retval = CHKRES_READY, new_session = 0; |
904 | unsigned char cmd[MAX_COMMAND_SIZE]; |
905 | struct st_request *SRpnt = NULL; |
906 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; |
907 | |
908 | max_wait = do_wait ? ST_BLOCK_SECONDS : 0; |
909 | |
910 | for (attentions=waits=0; ; ) { |
911 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); |
912 | cmd[0] = TEST_UNIT_READY; |
913 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, |
914 | STp->long_timeout, MAX_READY_RETRIES, 1); |
915 | |
916 | if (!SRpnt) { |
917 | retval = (STp->buffer)->syscall_result; |
918 | break; |
919 | } |
920 | |
921 | if (cmdstatp->have_sense) { |
922 | |
923 | scode = cmdstatp->sense_hdr.sense_key; |
924 | |
925 | if (scode == UNIT_ATTENTION) { /* New media? */ |
926 | new_session = 1; |
927 | if (attentions < MAX_ATTENTIONS) { |
928 | attentions++; |
929 | continue; |
930 | } |
931 | else { |
932 | retval = (-EIO); |
933 | break; |
934 | } |
935 | } |
936 | |
937 | if (scode == NOT_READY) { |
938 | if (waits < max_wait) { |
939 | if (msleep_interruptible(1000)) { |
940 | retval = (-EINTR); |
941 | break; |
942 | } |
943 | waits++; |
944 | continue; |
945 | } |
946 | else { |
947 | if ((STp->device)->scsi_level >= SCSI_2 && |
948 | cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */ |
949 | retval = CHKRES_NO_TAPE; |
950 | else |
951 | retval = CHKRES_NOT_READY; |
952 | break; |
953 | } |
954 | } |
955 | } |
956 | |
957 | retval = (STp->buffer)->syscall_result; |
958 | if (!retval) |
959 | retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY; |
960 | break; |
961 | } |
962 | |
963 | if (SRpnt != NULL) |
964 | st_release_request(SRpnt); |
965 | return retval; |
966 | } |
967 | |
968 | |
969 | /* See if the drive is ready and gather information about the tape. Return values: |
970 | < 0 negative error code from errno.h |
971 | 0 drive ready |
972 | 1 drive not ready (possibly no tape) |
973 | */ |
974 | static int check_tape(struct scsi_tape *STp, struct file *filp) |
975 | { |
976 | int i, retval, new_session = 0, do_wait; |
977 | unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning; |
978 | unsigned short st_flags = filp->f_flags; |
979 | struct st_request *SRpnt = NULL; |
980 | struct st_modedef *STm; |
981 | struct st_partstat *STps; |
982 | char *name = tape_name(STp); |
983 | struct inode *inode = filp->f_path.dentry->d_inode; |
984 | int mode = TAPE_MODE(inode); |
985 | |
986 | STp->ready = ST_READY; |
987 | |
988 | if (mode != STp->current_mode) { |
989 | DEBC(printk(ST_DEB_MSG "%s: Mode change from %d to %d.\n", |
990 | name, STp->current_mode, mode)); |
991 | new_session = 1; |
992 | STp->current_mode = mode; |
993 | } |
994 | STm = &(STp->modes[STp->current_mode]); |
995 | |
996 | saved_cleaning = STp->cleaning_req; |
997 | STp->cleaning_req = 0; |
998 | |
999 | do_wait = ((filp->f_flags & O_NONBLOCK) == 0); |
1000 | retval = test_ready(STp, do_wait); |
1001 | |
1002 | if (retval < 0) |
1003 | goto err_out; |
1004 | |
1005 | if (retval == CHKRES_NEW_SESSION) { |
1006 | STp->pos_unknown = 0; |
1007 | STp->partition = STp->new_partition = 0; |
1008 | if (STp->can_partitions) |
1009 | STp->nbr_partitions = 1; /* This guess will be updated later |
1010 | if necessary */ |
1011 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { |
1012 | STps = &(STp->ps[i]); |
1013 | STps->rw = ST_IDLE; |
1014 | STps->eof = ST_NOEOF; |
1015 | STps->at_sm = 0; |
1016 | STps->last_block_valid = 0; |
1017 | STps->drv_block = 0; |
1018 | STps->drv_file = 0; |
1019 | } |
1020 | new_session = 1; |
1021 | } |
1022 | else { |
1023 | STp->cleaning_req |= saved_cleaning; |
1024 | |
1025 | if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) { |
1026 | if (retval == CHKRES_NO_TAPE) |
1027 | STp->ready = ST_NO_TAPE; |
1028 | else |
1029 | STp->ready = ST_NOT_READY; |
1030 | |
1031 | STp->density = 0; /* Clear the erroneous "residue" */ |
1032 | STp->write_prot = 0; |
1033 | STp->block_size = 0; |
1034 | STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); |
1035 | STp->partition = STp->new_partition = 0; |
1036 | STp->door_locked = ST_UNLOCKED; |
1037 | return CHKRES_NOT_READY; |
1038 | } |
1039 | } |
1040 | |
1041 | if (STp->omit_blklims) |
1042 | STp->min_block = STp->max_block = (-1); |
1043 | else { |
1044 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); |
1045 | cmd[0] = READ_BLOCK_LIMITS; |
1046 | |
1047 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, |
1048 | STp->device->request_queue->rq_timeout, |
1049 | MAX_READY_RETRIES, 1); |
1050 | if (!SRpnt) { |
1051 | retval = (STp->buffer)->syscall_result; |
1052 | goto err_out; |
1053 | } |
1054 | |
1055 | if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) { |
1056 | STp->max_block = ((STp->buffer)->b_data[1] << 16) | |
1057 | ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; |
1058 | STp->min_block = ((STp->buffer)->b_data[4] << 8) | |
1059 | (STp->buffer)->b_data[5]; |
1060 | if ( DEB( debugging || ) !STp->inited) |
1061 | printk(KERN_INFO |
1062 | "%s: Block limits %d - %d bytes.\n", name, |
1063 | STp->min_block, STp->max_block); |
1064 | } else { |
1065 | STp->min_block = STp->max_block = (-1); |
1066 | DEBC(printk(ST_DEB_MSG "%s: Can't read block limits.\n", |
1067 | name)); |
1068 | } |
1069 | } |
1070 | |
1071 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); |
1072 | cmd[0] = MODE_SENSE; |
1073 | cmd[4] = 12; |
1074 | |
1075 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, |
1076 | STp->device->request_queue->rq_timeout, |
1077 | MAX_READY_RETRIES, 1); |
1078 | if (!SRpnt) { |
1079 | retval = (STp->buffer)->syscall_result; |
1080 | goto err_out; |
1081 | } |
1082 | |
1083 | if ((STp->buffer)->syscall_result != 0) { |
1084 | DEBC(printk(ST_DEB_MSG "%s: No Mode Sense.\n", name)); |
1085 | STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ |
1086 | (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ |
1087 | STp->drv_write_prot = 0; |
1088 | } else { |
1089 | DEBC(printk(ST_DEB_MSG |
1090 | "%s: Mode sense. Length %d, medium %x, WBS %x, BLL %d\n", |
1091 | name, |
1092 | (STp->buffer)->b_data[0], (STp->buffer)->b_data[1], |
1093 | (STp->buffer)->b_data[2], (STp->buffer)->b_data[3])); |
1094 | |
1095 | if ((STp->buffer)->b_data[3] >= 8) { |
1096 | STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; |
1097 | STp->density = (STp->buffer)->b_data[4]; |
1098 | STp->block_size = (STp->buffer)->b_data[9] * 65536 + |
1099 | (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; |
1100 | DEBC(printk(ST_DEB_MSG |
1101 | "%s: Density %x, tape length: %x, drv buffer: %d\n", |
1102 | name, STp->density, (STp->buffer)->b_data[5] * 65536 + |
1103 | (STp->buffer)->b_data[6] * 256 + (STp->buffer)->b_data[7], |
1104 | STp->drv_buffer)); |
1105 | } |
1106 | STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; |
1107 | } |
1108 | st_release_request(SRpnt); |
1109 | SRpnt = NULL; |
1110 | STp->inited = 1; |
1111 | |
1112 | if (STp->block_size > 0) |
1113 | (STp->buffer)->buffer_blocks = |
1114 | (STp->buffer)->buffer_size / STp->block_size; |
1115 | else |
1116 | (STp->buffer)->buffer_blocks = 1; |
1117 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; |
1118 | |
1119 | DEBC(printk(ST_DEB_MSG |
1120 | "%s: Block size: %d, buffer size: %d (%d blocks).\n", name, |
1121 | STp->block_size, (STp->buffer)->buffer_size, |
1122 | (STp->buffer)->buffer_blocks)); |
1123 | |
1124 | if (STp->drv_write_prot) { |
1125 | STp->write_prot = 1; |
1126 | |
1127 | DEBC(printk(ST_DEB_MSG "%s: Write protected\n", name)); |
1128 | |
1129 | if (do_wait && |
1130 | ((st_flags & O_ACCMODE) == O_WRONLY || |
1131 | (st_flags & O_ACCMODE) == O_RDWR)) { |
1132 | retval = (-EROFS); |
1133 | goto err_out; |
1134 | } |
1135 | } |
1136 | |
1137 | if (STp->can_partitions && STp->nbr_partitions < 1) { |
1138 | /* This code is reached when the device is opened for the first time |
1139 | after the driver has been initialized with tape in the drive and the |
1140 | partition support has been enabled. */ |
1141 | DEBC(printk(ST_DEB_MSG |
1142 | "%s: Updating partition number in status.\n", name)); |
1143 | if ((STp->partition = find_partition(STp)) < 0) { |
1144 | retval = STp->partition; |
1145 | goto err_out; |
1146 | } |
1147 | STp->new_partition = STp->partition; |
1148 | STp->nbr_partitions = 1; /* This guess will be updated when necessary */ |
1149 | } |
1150 | |
1151 | if (new_session) { /* Change the drive parameters for the new mode */ |
1152 | STp->density_changed = STp->blksize_changed = 0; |
1153 | STp->compression_changed = 0; |
1154 | if (!(STm->defaults_for_writes) && |
1155 | (retval = set_mode_densblk(STp, STm)) < 0) |
1156 | goto err_out; |
1157 | |
1158 | if (STp->default_drvbuffer != 0xff) { |
1159 | if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer)) |
1160 | printk(KERN_WARNING |
1161 | "%s: Can't set default drive buffering to %d.\n", |
1162 | name, STp->default_drvbuffer); |
1163 | } |
1164 | } |
1165 | |
1166 | return CHKRES_READY; |
1167 | |
1168 | err_out: |
1169 | return retval; |
1170 | } |
1171 | |
1172 | |
1173 | /* Open the device. Needs to take the BKL only because of incrementing the SCSI host |
1174 | module count. */ |
1175 | static int st_open(struct inode *inode, struct file *filp) |
1176 | { |
1177 | int i, retval = (-EIO); |
1178 | struct scsi_tape *STp; |
1179 | struct st_partstat *STps; |
1180 | int dev = TAPE_NR(inode); |
1181 | char *name; |
1182 | |
1183 | lock_kernel(); |
1184 | /* |
1185 | * We really want to do nonseekable_open(inode, filp); here, but some |
1186 | * versions of tar incorrectly call lseek on tapes and bail out if that |
1187 | * fails. So we disallow pread() and pwrite(), but permit lseeks. |
1188 | */ |
1189 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); |
1190 | |
1191 | if (!(STp = scsi_tape_get(dev))) { |
1192 | unlock_kernel(); |
1193 | return -ENXIO; |
1194 | } |
1195 | |
1196 | write_lock(&st_dev_arr_lock); |
1197 | filp->private_data = STp; |
1198 | name = tape_name(STp); |
1199 | |
1200 | if (STp->in_use) { |
1201 | write_unlock(&st_dev_arr_lock); |
1202 | scsi_tape_put(STp); |
1203 | unlock_kernel(); |
1204 | DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); ) |
1205 | return (-EBUSY); |
1206 | } |
1207 | |
1208 | STp->in_use = 1; |
1209 | write_unlock(&st_dev_arr_lock); |
1210 | STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; |
1211 | |
1212 | if (!scsi_block_when_processing_errors(STp->device)) { |
1213 | retval = (-ENXIO); |
1214 | goto err_out; |
1215 | } |
1216 | |
1217 | /* See that we have at least a one page buffer available */ |
1218 | if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) { |
1219 | printk(KERN_WARNING "%s: Can't allocate one page tape buffer.\n", |
1220 | name); |
1221 | retval = (-EOVERFLOW); |
1222 | goto err_out; |
1223 | } |
1224 | |
1225 | (STp->buffer)->cleared = 0; |
1226 | (STp->buffer)->writing = 0; |
1227 | (STp->buffer)->syscall_result = 0; |
1228 | |
1229 | STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY); |
1230 | |
1231 | STp->dirty = 0; |
1232 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { |
1233 | STps = &(STp->ps[i]); |
1234 | STps->rw = ST_IDLE; |
1235 | } |
1236 | STp->try_dio_now = STp->try_dio; |
1237 | STp->recover_count = 0; |
1238 | DEB( STp->nbr_waits = STp->nbr_finished = 0; |
1239 | STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; ) |
1240 | |
1241 | retval = check_tape(STp, filp); |
1242 | if (retval < 0) |
1243 | goto err_out; |
1244 | if ((filp->f_flags & O_NONBLOCK) == 0 && |
1245 | retval != CHKRES_READY) { |
1246 | if (STp->ready == NO_TAPE) |
1247 | retval = (-ENOMEDIUM); |
1248 | else |
1249 | retval = (-EIO); |
1250 | goto err_out; |
1251 | } |
1252 | unlock_kernel(); |
1253 | return 0; |
1254 | |
1255 | err_out: |
1256 | normalize_buffer(STp->buffer); |
1257 | STp->in_use = 0; |
1258 | scsi_tape_put(STp); |
1259 | unlock_kernel(); |
1260 | return retval; |
1261 | |
1262 | } |
1263 | |
1264 | |
1265 | /* Flush the tape buffer before close */ |
1266 | static int st_flush(struct file *filp, fl_owner_t id) |
1267 | { |
1268 | int result = 0, result2; |
1269 | unsigned char cmd[MAX_COMMAND_SIZE]; |
1270 | struct st_request *SRpnt; |
1271 | struct scsi_tape *STp = filp->private_data; |
1272 | struct st_modedef *STm = &(STp->modes[STp->current_mode]); |
1273 | struct st_partstat *STps = &(STp->ps[STp->partition]); |
1274 | char *name = tape_name(STp); |
1275 | |
1276 | if (file_count(filp) > 1) |
1277 | return 0; |
1278 | |
1279 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { |
1280 | result = st_flush_write_buffer(STp); |
1281 | if (result != 0 && result != (-ENOSPC)) |
1282 | goto out; |
1283 | } |
1284 | |
1285 | if (STp->can_partitions && |
1286 | (result2 = switch_partition(STp)) < 0) { |
1287 | DEBC(printk(ST_DEB_MSG |
1288 | "%s: switch_partition at close failed.\n", name)); |
1289 | if (result == 0) |
1290 | result = result2; |
1291 | goto out; |
1292 | } |
1293 | |
1294 | DEBC( if (STp->nbr_requests) |
1295 | printk(KERN_DEBUG "%s: Number of r/w requests %d, dio used in %d, pages %d.\n", |
1296 | name, STp->nbr_requests, STp->nbr_dio, STp->nbr_pages)); |
1297 | |
1298 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { |
1299 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; |
1300 | |
1301 | DEBC(printk(ST_DEB_MSG "%s: Async write waits %d, finished %d.\n", |
1302 | name, STp->nbr_waits, STp->nbr_finished); |
1303 | ) |
1304 | |
1305 | memset(cmd, 0, MAX_COMMAND_SIZE); |
1306 | cmd[0] = WRITE_FILEMARKS; |
1307 | cmd[4] = 1 + STp->two_fm; |
1308 | |
1309 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
1310 | STp->device->request_queue->rq_timeout, |
1311 | MAX_WRITE_RETRIES, 1); |
1312 | if (!SRpnt) { |
1313 | result = (STp->buffer)->syscall_result; |
1314 | goto out; |
1315 | } |
1316 | |
1317 | if (STp->buffer->syscall_result == 0 || |
1318 | (cmdstatp->have_sense && !cmdstatp->deferred && |
1319 | (cmdstatp->flags & SENSE_EOM) && |
1320 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || |
1321 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && |
1322 | (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) { |
1323 | /* Write successful at EOM */ |
1324 | st_release_request(SRpnt); |
1325 | SRpnt = NULL; |
1326 | if (STps->drv_file >= 0) |
1327 | STps->drv_file++; |
1328 | STps->drv_block = 0; |
1329 | if (STp->two_fm) |
1330 | cross_eof(STp, 0); |
1331 | STps->eof = ST_FM; |
1332 | } |
1333 | else { /* Write error */ |
1334 | st_release_request(SRpnt); |
1335 | SRpnt = NULL; |
1336 | printk(KERN_ERR "%s: Error on write filemark.\n", name); |
1337 | if (result == 0) |
1338 | result = (-EIO); |
1339 | } |
1340 | |
1341 | DEBC(printk(ST_DEB_MSG "%s: Buffer flushed, %d EOF(s) written\n", |
1342 | name, cmd[4])); |
1343 | } else if (!STp->rew_at_close) { |
1344 | STps = &(STp->ps[STp->partition]); |
1345 | if (!STm->sysv || STps->rw != ST_READING) { |
1346 | if (STp->can_bsr) |
1347 | result = flush_buffer(STp, 0); |
1348 | else if (STps->eof == ST_FM_HIT) { |
1349 | result = cross_eof(STp, 0); |
1350 | if (result) { |
1351 | if (STps->drv_file >= 0) |
1352 | STps->drv_file++; |
1353 | STps->drv_block = 0; |
1354 | STps->eof = ST_FM; |
1355 | } else |
1356 | STps->eof = ST_NOEOF; |
1357 | } |
1358 | } else if ((STps->eof == ST_NOEOF && |
1359 | !(result = cross_eof(STp, 1))) || |
1360 | STps->eof == ST_FM_HIT) { |
1361 | if (STps->drv_file >= 0) |
1362 | STps->drv_file++; |
1363 | STps->drv_block = 0; |
1364 | STps->eof = ST_FM; |
1365 | } |
1366 | } |
1367 | |
1368 | out: |
1369 | if (STp->rew_at_close) { |
1370 | result2 = st_int_ioctl(STp, MTREW, 1); |
1371 | if (result == 0) |
1372 | result = result2; |
1373 | } |
1374 | return result; |
1375 | } |
1376 | |
1377 | |
1378 | /* Close the device and release it. BKL is not needed: this is the only thread |
1379 | accessing this tape. */ |
1380 | static int st_release(struct inode *inode, struct file *filp) |
1381 | { |
1382 | int result = 0; |
1383 | struct scsi_tape *STp = filp->private_data; |
1384 | |
1385 | if (STp->door_locked == ST_LOCKED_AUTO) |
1386 | do_door_lock(STp, 0); |
1387 | |
1388 | normalize_buffer(STp->buffer); |
1389 | write_lock(&st_dev_arr_lock); |
1390 | STp->in_use = 0; |
1391 | write_unlock(&st_dev_arr_lock); |
1392 | scsi_tape_put(STp); |
1393 | |
1394 | return result; |
1395 | } |
1396 | |
1397 | /* The checks common to both reading and writing */ |
1398 | static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count) |
1399 | { |
1400 | ssize_t retval = 0; |
1401 | |
1402 | /* |
1403 | * If we are in the middle of error recovery, don't let anyone |
1404 | * else try and use this device. Also, if error recovery fails, it |
1405 | * may try and take the device offline, in which case all further |
1406 | * access to the device is prohibited. |
1407 | */ |
1408 | if (!scsi_block_when_processing_errors(STp->device)) { |
1409 | retval = (-ENXIO); |
1410 | goto out; |
1411 | } |
1412 | |
1413 | if (STp->ready != ST_READY) { |
1414 | if (STp->ready == ST_NO_TAPE) |
1415 | retval = (-ENOMEDIUM); |
1416 | else |
1417 | retval = (-EIO); |
1418 | goto out; |
1419 | } |
1420 | |
1421 | if (! STp->modes[STp->current_mode].defined) { |
1422 | retval = (-ENXIO); |
1423 | goto out; |
1424 | } |
1425 | |
1426 | |
1427 | /* |
1428 | * If there was a bus reset, block further access |
1429 | * to this device. |
1430 | */ |
1431 | if (STp->pos_unknown) { |
1432 | retval = (-EIO); |
1433 | goto out; |
1434 | } |
1435 | |
1436 | if (count == 0) |
1437 | goto out; |
1438 | |
1439 | DEB( |
1440 | if (!STp->in_use) { |
1441 | printk(ST_DEB_MSG "%s: Incorrect device.\n", tape_name(STp)); |
1442 | retval = (-EIO); |
1443 | goto out; |
1444 | } ) /* end DEB */ |
1445 | |
1446 | if (STp->can_partitions && |
1447 | (retval = switch_partition(STp)) < 0) |
1448 | goto out; |
1449 | |
1450 | if (STp->block_size == 0 && STp->max_block > 0 && |
1451 | (count < STp->min_block || count > STp->max_block)) { |
1452 | retval = (-EINVAL); |
1453 | goto out; |
1454 | } |
1455 | |
1456 | if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && |
1457 | !do_door_lock(STp, 1)) |
1458 | STp->door_locked = ST_LOCKED_AUTO; |
1459 | |
1460 | out: |
1461 | return retval; |
1462 | } |
1463 | |
1464 | |
1465 | static int setup_buffering(struct scsi_tape *STp, const char __user *buf, |
1466 | size_t count, int is_read) |
1467 | { |
1468 | int i, bufsize, retval = 0; |
1469 | struct st_buffer *STbp = STp->buffer; |
1470 | |
1471 | if (is_read) |
1472 | i = STp->try_dio_now && try_rdio; |
1473 | else |
1474 | i = STp->try_dio_now && try_wdio; |
1475 | |
1476 | if (i && ((unsigned long)buf & queue_dma_alignment( |
1477 | STp->device->request_queue)) == 0) { |
1478 | i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf, |
1479 | count, (is_read ? READ : WRITE)); |
1480 | if (i > 0) { |
1481 | STbp->do_dio = i; |
1482 | STbp->buffer_bytes = 0; /* can be used as transfer counter */ |
1483 | } |
1484 | else |
1485 | STbp->do_dio = 0; /* fall back to buffering with any error */ |
1486 | STbp->sg_segs = STbp->do_dio; |
1487 | DEB( |
1488 | if (STbp->do_dio) { |
1489 | STp->nbr_dio++; |
1490 | STp->nbr_pages += STbp->do_dio; |
1491 | } |
1492 | ) |
1493 | } else |
1494 | STbp->do_dio = 0; |
1495 | DEB( STp->nbr_requests++; ) |
1496 | |
1497 | if (!STbp->do_dio) { |
1498 | if (STp->block_size) |
1499 | bufsize = STp->block_size > st_fixed_buffer_size ? |
1500 | STp->block_size : st_fixed_buffer_size; |
1501 | else { |
1502 | bufsize = count; |
1503 | /* Make sure that data from previous user is not leaked even if |
1504 | HBA does not return correct residual */ |
1505 | if (is_read && STp->sili && !STbp->cleared) |
1506 | clear_buffer(STbp); |
1507 | } |
1508 | |
1509 | if (bufsize > STbp->buffer_size && |
1510 | !enlarge_buffer(STbp, bufsize, STp->restr_dma)) { |
1511 | printk(KERN_WARNING "%s: Can't allocate %d byte tape buffer.\n", |
1512 | tape_name(STp), bufsize); |
1513 | retval = (-EOVERFLOW); |
1514 | goto out; |
1515 | } |
1516 | if (STp->block_size) |
1517 | STbp->buffer_blocks = bufsize / STp->block_size; |
1518 | } |
1519 | |
1520 | out: |
1521 | return retval; |
1522 | } |
1523 | |
1524 | |
1525 | /* Can be called more than once after each setup_buffer() */ |
1526 | static void release_buffering(struct scsi_tape *STp, int is_read) |
1527 | { |
1528 | struct st_buffer *STbp; |
1529 | |
1530 | STbp = STp->buffer; |
1531 | if (STbp->do_dio) { |
1532 | sgl_unmap_user_pages(STbp, STbp->do_dio, is_read); |
1533 | STbp->do_dio = 0; |
1534 | STbp->sg_segs = 0; |
1535 | } |
1536 | } |
1537 | |
1538 | |
1539 | /* Write command */ |
1540 | static ssize_t |
1541 | st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) |
1542 | { |
1543 | ssize_t total; |
1544 | ssize_t i, do_count, blks, transfer; |
1545 | ssize_t retval; |
1546 | int undone, retry_eot = 0, scode; |
1547 | int async_write; |
1548 | unsigned char cmd[MAX_COMMAND_SIZE]; |
1549 | const char __user *b_point; |
1550 | struct st_request *SRpnt = NULL; |
1551 | struct scsi_tape *STp = filp->private_data; |
1552 | struct st_modedef *STm; |
1553 | struct st_partstat *STps; |
1554 | struct st_buffer *STbp; |
1555 | char *name = tape_name(STp); |
1556 | |
1557 | if (mutex_lock_interruptible(&STp->lock)) |
1558 | return -ERESTARTSYS; |
1559 | |
1560 | retval = rw_checks(STp, filp, count); |
1561 | if (retval || count == 0) |
1562 | goto out; |
1563 | |
1564 | /* Write must be integral number of blocks */ |
1565 | if (STp->block_size != 0 && (count % STp->block_size) != 0) { |
1566 | printk(KERN_WARNING "%s: Write not multiple of tape block size.\n", |
1567 | name); |
1568 | retval = (-EINVAL); |
1569 | goto out; |
1570 | } |
1571 | |
1572 | STm = &(STp->modes[STp->current_mode]); |
1573 | STps = &(STp->ps[STp->partition]); |
1574 | |
1575 | if (STp->write_prot) { |
1576 | retval = (-EACCES); |
1577 | goto out; |
1578 | } |
1579 | |
1580 | |
1581 | if (STps->rw == ST_READING) { |
1582 | retval = flush_buffer(STp, 0); |
1583 | if (retval) |
1584 | goto out; |
1585 | STps->rw = ST_WRITING; |
1586 | } else if (STps->rw != ST_WRITING && |
1587 | STps->drv_file == 0 && STps->drv_block == 0) { |
1588 | if ((retval = set_mode_densblk(STp, STm)) < 0) |
1589 | goto out; |
1590 | if (STm->default_compression != ST_DONT_TOUCH && |
1591 | !(STp->compression_changed)) { |
1592 | if (st_compression(STp, (STm->default_compression == ST_YES))) { |
1593 | printk(KERN_WARNING "%s: Can't set default compression.\n", |
1594 | name); |
1595 | if (modes_defined) { |
1596 | retval = (-EINVAL); |
1597 | goto out; |
1598 | } |
1599 | } |
1600 | } |
1601 | } |
1602 | |
1603 | STbp = STp->buffer; |
1604 | i = write_behind_check(STp); |
1605 | if (i) { |
1606 | if (i == -ENOSPC) |
1607 | STps->eof = ST_EOM_OK; |
1608 | else |
1609 | STps->eof = ST_EOM_ERROR; |
1610 | } |
1611 | |
1612 | if (STps->eof == ST_EOM_OK) { |
1613 | STps->eof = ST_EOD_1; /* allow next write */ |
1614 | retval = (-ENOSPC); |
1615 | goto out; |
1616 | } |
1617 | else if (STps->eof == ST_EOM_ERROR) { |
1618 | retval = (-EIO); |
1619 | goto out; |
1620 | } |
1621 | |
1622 | /* Check the buffer readability in cases where copy_user might catch |
1623 | the problems after some tape movement. */ |
1624 | if (STp->block_size != 0 && |
1625 | !STbp->do_dio && |
1626 | (copy_from_user(&i, buf, 1) != 0 || |
1627 | copy_from_user(&i, buf + count - 1, 1) != 0)) { |
1628 | retval = (-EFAULT); |
1629 | goto out; |
1630 | } |
1631 | |
1632 | retval = setup_buffering(STp, buf, count, 0); |
1633 | if (retval) |
1634 | goto out; |
1635 | |
1636 | total = count; |
1637 | |
1638 | memset(cmd, 0, MAX_COMMAND_SIZE); |
1639 | cmd[0] = WRITE_6; |
1640 | cmd[1] = (STp->block_size != 0); |
1641 | |
1642 | STps->rw = ST_WRITING; |
1643 | |
1644 | b_point = buf; |
1645 | while (count > 0 && !retry_eot) { |
1646 | |
1647 | if (STbp->do_dio) { |
1648 | do_count = count; |
1649 | } |
1650 | else { |
1651 | if (STp->block_size == 0) |
1652 | do_count = count; |
1653 | else { |
1654 | do_count = STbp->buffer_blocks * STp->block_size - |
1655 | STbp->buffer_bytes; |
1656 | if (do_count > count) |
1657 | do_count = count; |
1658 | } |
1659 | |
1660 | i = append_to_buffer(b_point, STbp, do_count); |
1661 | if (i) { |
1662 | retval = i; |
1663 | goto out; |
1664 | } |
1665 | } |
1666 | count -= do_count; |
1667 | b_point += do_count; |
1668 | |
1669 | async_write = STp->block_size == 0 && !STbp->do_dio && |
1670 | STm->do_async_writes && STps->eof < ST_EOM_OK; |
1671 | |
1672 | if (STp->block_size != 0 && STm->do_buffer_writes && |
1673 | !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK && |
1674 | STbp->buffer_bytes < STbp->buffer_size) { |
1675 | STp->dirty = 1; |
1676 | /* Don't write a buffer that is not full enough. */ |
1677 | if (!async_write && count == 0) |
1678 | break; |
1679 | } |
1680 | |
1681 | retry_write: |
1682 | if (STp->block_size == 0) |
1683 | blks = transfer = do_count; |
1684 | else { |
1685 | if (!STbp->do_dio) |
1686 | blks = STbp->buffer_bytes; |
1687 | else |
1688 | blks = do_count; |
1689 | blks /= STp->block_size; |
1690 | transfer = blks * STp->block_size; |
1691 | } |
1692 | cmd[2] = blks >> 16; |
1693 | cmd[3] = blks >> 8; |
1694 | cmd[4] = blks; |
1695 | |
1696 | SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE, |
1697 | STp->device->request_queue->rq_timeout, |
1698 | MAX_WRITE_RETRIES, !async_write); |
1699 | if (!SRpnt) { |
1700 | retval = STbp->syscall_result; |
1701 | goto out; |
1702 | } |
1703 | if (async_write && !STbp->syscall_result) { |
1704 | STbp->writing = transfer; |
1705 | STp->dirty = !(STbp->writing == |
1706 | STbp->buffer_bytes); |
1707 | SRpnt = NULL; /* Prevent releasing this request! */ |
1708 | DEB( STp->write_pending = 1; ) |
1709 | break; |
1710 | } |
1711 | |
1712 | if (STbp->syscall_result != 0) { |
1713 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; |
1714 | |
1715 | DEBC(printk(ST_DEB_MSG "%s: Error on write:\n", name)); |
1716 | if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) { |
1717 | scode = cmdstatp->sense_hdr.sense_key; |
1718 | if (cmdstatp->remainder_valid) |
1719 | undone = (int)cmdstatp->uremainder64; |
1720 | else if (STp->block_size == 0 && |
1721 | scode == VOLUME_OVERFLOW) |
1722 | undone = transfer; |
1723 | else |
1724 | undone = 0; |
1725 | if (STp->block_size != 0) |
1726 | undone *= STp->block_size; |
1727 | if (undone <= do_count) { |
1728 | /* Only data from this write is not written */ |
1729 | count += undone; |
1730 | b_point -= undone; |
1731 | do_count -= undone; |
1732 | if (STp->block_size) |
1733 | blks = (transfer - undone) / STp->block_size; |
1734 | STps->eof = ST_EOM_OK; |
1735 | /* Continue in fixed block mode if all written |
1736 | in this request but still something left to write |
1737 | (retval left to zero) |
1738 | */ |
1739 | if (STp->block_size == 0 || |
1740 | undone > 0 || count == 0) |
1741 | retval = (-ENOSPC); /* EOM within current request */ |
1742 | DEBC(printk(ST_DEB_MSG |
1743 | "%s: EOM with %d bytes unwritten.\n", |
1744 | name, (int)count)); |
1745 | } else { |
1746 | /* EOT within data buffered earlier (possible only |
1747 | in fixed block mode without direct i/o) */ |
1748 | if (!retry_eot && !cmdstatp->deferred && |
1749 | (scode == NO_SENSE || scode == RECOVERED_ERROR)) { |
1750 | move_buffer_data(STp->buffer, transfer - undone); |
1751 | retry_eot = 1; |
1752 | if (STps->drv_block >= 0) { |
1753 | STps->drv_block += (transfer - undone) / |
1754 | STp->block_size; |
1755 | } |
1756 | STps->eof = ST_EOM_OK; |
1757 | DEBC(printk(ST_DEB_MSG |
1758 | "%s: Retry write of %d bytes at EOM.\n", |
1759 | name, STp->buffer->buffer_bytes)); |
1760 | goto retry_write; |
1761 | } |
1762 | else { |
1763 | /* Either error within data buffered by driver or |
1764 | failed retry */ |
1765 | count -= do_count; |
1766 | blks = do_count = 0; |
1767 | STps->eof = ST_EOM_ERROR; |
1768 | STps->drv_block = (-1); /* Too cautious? */ |
1769 | retval = (-EIO); /* EOM for old data */ |
1770 | DEBC(printk(ST_DEB_MSG |
1771 | "%s: EOM with lost data.\n", |
1772 | name)); |
1773 | } |
1774 | } |
1775 | } else { |
1776 | count += do_count; |
1777 | STps->drv_block = (-1); /* Too cautious? */ |
1778 | retval = STbp->syscall_result; |
1779 | } |
1780 | |
1781 | } |
1782 | |
1783 | if (STps->drv_block >= 0) { |
1784 | if (STp->block_size == 0) |
1785 | STps->drv_block += (do_count > 0); |
1786 | else |
1787 | STps->drv_block += blks; |
1788 | } |
1789 | |
1790 | STbp->buffer_bytes = 0; |
1791 | STp->dirty = 0; |
1792 | |
1793 | if (retval || retry_eot) { |
1794 | if (count < total) |
1795 | retval = total - count; |
1796 | goto out; |
1797 | } |
1798 | } |
1799 | |
1800 | if (STps->eof == ST_EOD_1) |
1801 | STps->eof = ST_EOM_OK; |
1802 | else if (STps->eof != ST_EOM_OK) |
1803 | STps->eof = ST_NOEOF; |
1804 | retval = total - count; |
1805 | |
1806 | out: |
1807 | if (SRpnt != NULL) |
1808 | st_release_request(SRpnt); |
1809 | release_buffering(STp, 0); |
1810 | mutex_unlock(&STp->lock); |
1811 | |
1812 | return retval; |
1813 | } |
1814 | |
1815 | /* Read data from the tape. Returns zero in the normal case, one if the |
1816 | eof status has changed, and the negative error code in case of a |
1817 | fatal error. Otherwise updates the buffer and the eof state. |
1818 | |
1819 | Does release user buffer mapping if it is set. |
1820 | */ |
1821 | static long read_tape(struct scsi_tape *STp, long count, |
1822 | struct st_request ** aSRpnt) |
1823 | { |
1824 | int transfer, blks, bytes; |
1825 | unsigned char cmd[MAX_COMMAND_SIZE]; |
1826 | struct st_request *SRpnt; |
1827 | struct st_modedef *STm; |
1828 | struct st_partstat *STps; |
1829 | struct st_buffer *STbp; |
1830 | int retval = 0; |
1831 | char *name = tape_name(STp); |
1832 | |
1833 | if (count == 0) |
1834 | return 0; |
1835 | |
1836 | STm = &(STp->modes[STp->current_mode]); |
1837 | STps = &(STp->ps[STp->partition]); |
1838 | if (STps->eof == ST_FM_HIT) |
1839 | return 1; |
1840 | STbp = STp->buffer; |
1841 | |
1842 | if (STp->block_size == 0) |
1843 | blks = bytes = count; |
1844 | else { |
1845 | if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) { |
1846 | blks = (STp->buffer)->buffer_blocks; |
1847 | bytes = blks * STp->block_size; |
1848 | } else { |
1849 | bytes = count; |
1850 | if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size) |
1851 | bytes = (STp->buffer)->buffer_size; |
1852 | blks = bytes / STp->block_size; |
1853 | bytes = blks * STp->block_size; |
1854 | } |
1855 | } |
1856 | |
1857 | memset(cmd, 0, MAX_COMMAND_SIZE); |
1858 | cmd[0] = READ_6; |
1859 | cmd[1] = (STp->block_size != 0); |
1860 | if (!cmd[1] && STp->sili) |
1861 | cmd[1] |= 2; |
1862 | cmd[2] = blks >> 16; |
1863 | cmd[3] = blks >> 8; |
1864 | cmd[4] = blks; |
1865 | |
1866 | SRpnt = *aSRpnt; |
1867 | SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE, |
1868 | STp->device->request_queue->rq_timeout, |
1869 | MAX_RETRIES, 1); |
1870 | release_buffering(STp, 1); |
1871 | *aSRpnt = SRpnt; |
1872 | if (!SRpnt) |
1873 | return STbp->syscall_result; |
1874 | |
1875 | STbp->read_pointer = 0; |
1876 | STps->at_sm = 0; |
1877 | |
1878 | /* Something to check */ |
1879 | if (STbp->syscall_result) { |
1880 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; |
1881 | |
1882 | retval = 1; |
1883 | DEBC(printk(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", |
1884 | name, |
1885 | SRpnt->sense[0], SRpnt->sense[1], |
1886 | SRpnt->sense[2], SRpnt->sense[3], |
1887 | SRpnt->sense[4], SRpnt->sense[5], |
1888 | SRpnt->sense[6], SRpnt->sense[7])); |
1889 | if (cmdstatp->have_sense) { |
1890 | |
1891 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) |
1892 | cmdstatp->flags &= 0xcf; /* No need for EOM in this case */ |
1893 | |
1894 | if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */ |
1895 | /* Compute the residual count */ |
1896 | if (cmdstatp->remainder_valid) |
1897 | transfer = (int)cmdstatp->uremainder64; |
1898 | else |
1899 | transfer = 0; |
1900 | if (STp->block_size == 0 && |
1901 | cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) |
1902 | transfer = bytes; |
1903 | |
1904 | if (cmdstatp->flags & SENSE_ILI) { /* ILI */ |
1905 | if (STp->block_size == 0) { |
1906 | if (transfer <= 0) { |
1907 | if (transfer < 0) |
1908 | printk(KERN_NOTICE |
1909 | "%s: Failed to read %d byte block with %d byte transfer.\n", |
1910 | name, bytes - transfer, bytes); |
1911 | if (STps->drv_block >= 0) |
1912 | STps->drv_block += 1; |
1913 | STbp->buffer_bytes = 0; |
1914 | return (-ENOMEM); |
1915 | } |
1916 | STbp->buffer_bytes = bytes - transfer; |
1917 | } else { |
1918 | st_release_request(SRpnt); |
1919 | SRpnt = *aSRpnt = NULL; |
1920 | if (transfer == blks) { /* We did not get anything, error */ |
1921 | printk(KERN_NOTICE "%s: Incorrect block size.\n", name); |
1922 | if (STps->drv_block >= 0) |
1923 | STps->drv_block += blks - transfer + 1; |
1924 | st_int_ioctl(STp, MTBSR, 1); |
1925 | return (-EIO); |
1926 | } |
1927 | /* We have some data, deliver it */ |
1928 | STbp->buffer_bytes = (blks - transfer) * |
1929 | STp->block_size; |
1930 | DEBC(printk(ST_DEB_MSG |
1931 | "%s: ILI but enough data received %ld %d.\n", |
1932 | name, count, STbp->buffer_bytes)); |
1933 | if (STps->drv_block >= 0) |
1934 | STps->drv_block += 1; |
1935 | if (st_int_ioctl(STp, MTBSR, 1)) |
1936 | return (-EIO); |
1937 | } |
1938 | } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */ |
1939 | if (STps->eof != ST_FM_HIT) |
1940 | STps->eof = ST_FM_HIT; |
1941 | else |
1942 | STps->eof = ST_EOD_2; |
1943 | if (STp->block_size == 0) |
1944 | STbp->buffer_bytes = 0; |
1945 | else |
1946 | STbp->buffer_bytes = |
1947 | bytes - transfer * STp->block_size; |
1948 | DEBC(printk(ST_DEB_MSG |
1949 | "%s: EOF detected (%d bytes read).\n", |
1950 | name, STbp->buffer_bytes)); |
1951 | } else if (cmdstatp->flags & SENSE_EOM) { |
1952 | if (STps->eof == ST_FM) |
1953 | STps->eof = ST_EOD_1; |
1954 | else |
1955 | STps->eof = ST_EOM_OK; |
1956 | if (STp->block_size == 0) |
1957 | STbp->buffer_bytes = bytes - transfer; |
1958 | else |
1959 | STbp->buffer_bytes = |
1960 | bytes - transfer * STp->block_size; |
1961 | |
1962 | DEBC(printk(ST_DEB_MSG "%s: EOM detected (%d bytes read).\n", |
1963 | name, STbp->buffer_bytes)); |
1964 | } |
1965 | } |
1966 | /* end of EOF, EOM, ILI test */ |
1967 | else { /* nonzero sense key */ |
1968 | DEBC(printk(ST_DEB_MSG |
1969 | "%s: Tape error while reading.\n", name)); |
1970 | STps->drv_block = (-1); |
1971 | if (STps->eof == ST_FM && |
1972 | cmdstatp->sense_hdr.sense_key == BLANK_CHECK) { |
1973 | DEBC(printk(ST_DEB_MSG |
1974 | "%s: Zero returned for first BLANK CHECK after EOF.\n", |
1975 | name)); |
1976 | STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */ |
1977 | } else /* Some other extended sense code */ |
1978 | retval = (-EIO); |
1979 | } |
1980 | |
1981 | if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */ |
1982 | STbp->buffer_bytes = 0; |
1983 | } |
1984 | /* End of extended sense test */ |
1985 | else { /* Non-extended sense */ |
1986 | retval = STbp->syscall_result; |
1987 | } |
1988 | |
1989 | } |
1990 | /* End of error handling */ |
1991 | else { /* Read successful */ |
1992 | STbp->buffer_bytes = bytes; |
1993 | if (STp->sili) /* In fixed block mode residual is always zero here */ |
1994 | STbp->buffer_bytes -= STp->buffer->cmdstat.residual; |
1995 | } |
1996 | |
1997 | if (STps->drv_block >= 0) { |
1998 | if (STp->block_size == 0) |
1999 | STps->drv_block++; |
2000 | else |
2001 | STps->drv_block += STbp->buffer_bytes / STp->block_size; |
2002 | } |
2003 | return retval; |
2004 | } |
2005 | |
2006 | |
2007 | /* Read command */ |
2008 | static ssize_t |
2009 | st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) |
2010 | { |
2011 | ssize_t total; |
2012 | ssize_t retval = 0; |
2013 | ssize_t i, transfer; |
2014 | int special, do_dio = 0; |
2015 | struct st_request *SRpnt = NULL; |
2016 | struct scsi_tape *STp = filp->private_data; |
2017 | struct st_modedef *STm; |
2018 | struct st_partstat *STps; |
2019 | struct st_buffer *STbp = STp->buffer; |
2020 | DEB( char *name = tape_name(STp); ) |
2021 | |
2022 | if (mutex_lock_interruptible(&STp->lock)) |
2023 | return -ERESTARTSYS; |
2024 | |
2025 | retval = rw_checks(STp, filp, count); |
2026 | if (retval || count == 0) |
2027 | goto out; |
2028 | |
2029 | STm = &(STp->modes[STp->current_mode]); |
2030 | if (STp->block_size != 0 && (count % STp->block_size) != 0) { |
2031 | if (!STm->do_read_ahead) { |
2032 | retval = (-EINVAL); /* Read must be integral number of blocks */ |
2033 | goto out; |
2034 | } |
2035 | STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */ |
2036 | } |
2037 | |
2038 | STps = &(STp->ps[STp->partition]); |
2039 | if (STps->rw == ST_WRITING) { |
2040 | retval = flush_buffer(STp, 0); |
2041 | if (retval) |
2042 | goto out; |
2043 | STps->rw = ST_READING; |
2044 | } |
2045 | DEB( |
2046 | if (debugging && STps->eof != ST_NOEOF) |
2047 | printk(ST_DEB_MSG "%s: EOF/EOM flag up (%d). Bytes %d\n", name, |
2048 | STps->eof, STbp->buffer_bytes); |
2049 | ) /* end DEB */ |
2050 | |
2051 | retval = setup_buffering(STp, buf, count, 1); |
2052 | if (retval) |
2053 | goto out; |
2054 | do_dio = STbp->do_dio; |
2055 | |
2056 | if (STbp->buffer_bytes == 0 && |
2057 | STps->eof >= ST_EOD_1) { |
2058 | if (STps->eof < ST_EOD) { |
2059 | STps->eof += 1; |
2060 | retval = 0; |
2061 | goto out; |
2062 | } |
2063 | retval = (-EIO); /* EOM or Blank Check */ |
2064 | goto out; |
2065 | } |
2066 | |
2067 | if (do_dio) { |
2068 | /* Check the buffer writability before any tape movement. Don't alter |
2069 | buffer data. */ |
2070 | if (copy_from_user(&i, buf, 1) != 0 || |
2071 | copy_to_user(buf, &i, 1) != 0 || |
2072 | copy_from_user(&i, buf + count - 1, 1) != 0 || |
2073 | copy_to_user(buf + count - 1, &i, 1) != 0) { |
2074 | retval = (-EFAULT); |
2075 | goto out; |
2076 | } |
2077 | } |
2078 | |
2079 | STps->rw = ST_READING; |
2080 | |
2081 | |
2082 | /* Loop until enough data in buffer or a special condition found */ |
2083 | for (total = 0, special = 0; total < count && !special;) { |
2084 | |
2085 | /* Get new data if the buffer is empty */ |
2086 | if (STbp->buffer_bytes == 0) { |
2087 | special = read_tape(STp, count - total, &SRpnt); |
2088 | if (special < 0) { /* No need to continue read */ |
2089 | retval = special; |
2090 | goto out; |
2091 | } |
2092 | } |
2093 | |
2094 | /* Move the data from driver buffer to user buffer */ |
2095 | if (STbp->buffer_bytes > 0) { |
2096 | DEB( |
2097 | if (debugging && STps->eof != ST_NOEOF) |
2098 | printk(ST_DEB_MSG |
2099 | "%s: EOF up (%d). Left %d, needed %d.\n", name, |
2100 | STps->eof, STbp->buffer_bytes, |
2101 | (int)(count - total)); |
2102 | ) /* end DEB */ |
2103 | transfer = STbp->buffer_bytes < count - total ? |
2104 | STbp->buffer_bytes : count - total; |
2105 | if (!do_dio) { |
2106 | i = from_buffer(STbp, buf, transfer); |
2107 | if (i) { |
2108 | retval = i; |
2109 | goto out; |
2110 | } |
2111 | } |
2112 | buf += transfer; |
2113 | total += transfer; |
2114 | } |
2115 | |
2116 | if (STp->block_size == 0) |
2117 | break; /* Read only one variable length block */ |
2118 | |
2119 | } /* for (total = 0, special = 0; |
2120 | total < count && !special; ) */ |
2121 | |
2122 | /* Change the eof state if no data from tape or buffer */ |
2123 | if (total == 0) { |
2124 | if (STps->eof == ST_FM_HIT) { |
2125 | STps->eof = ST_FM; |
2126 | STps->drv_block = 0; |
2127 | if (STps->drv_file >= 0) |
2128 | STps->drv_file++; |
2129 | } else if (STps->eof == ST_EOD_1) { |
2130 | STps->eof = ST_EOD_2; |
2131 | STps->drv_block = 0; |
2132 | if (STps->drv_file >= 0) |
2133 | STps->drv_file++; |
2134 | } else if (STps->eof == ST_EOD_2) |
2135 | STps->eof = ST_EOD; |
2136 | } else if (STps->eof == ST_FM) |
2137 | STps->eof = ST_NOEOF; |
2138 | retval = total; |
2139 | |
2140 | out: |
2141 | if (SRpnt != NULL) { |
2142 | st_release_request(SRpnt); |
2143 | SRpnt = NULL; |
2144 | } |
2145 | if (do_dio) { |
2146 | release_buffering(STp, 1); |
2147 | STbp->buffer_bytes = 0; |
2148 | } |
2149 | mutex_unlock(&STp->lock); |
2150 | |
2151 | return retval; |
2152 | } |
2153 | |
2154 | |
2155 | |
2156 | DEB( |
2157 | /* Set the driver options */ |
2158 | static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm, char *name) |
2159 | { |
2160 | if (debugging) { |
2161 | printk(KERN_INFO |
2162 | "%s: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n", |
2163 | name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes, |
2164 | STm->do_read_ahead); |
2165 | printk(KERN_INFO |
2166 | "%s: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n", |
2167 | name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock); |
2168 | printk(KERN_INFO |
2169 | "%s: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n", |
2170 | name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions, |
2171 | STp->scsi2_logical); |
2172 | printk(KERN_INFO |
2173 | "%s: sysv: %d nowait: %d sili: %d\n", name, STm->sysv, STp->immediate, |
2174 | STp->sili); |
2175 | printk(KERN_INFO "%s: debugging: %d\n", |
2176 | name, debugging); |
2177 | } |
2178 | } |
2179 | ) |
2180 | |
2181 | |
2182 | static int st_set_options(struct scsi_tape *STp, long options) |
2183 | { |
2184 | int value; |
2185 | long code; |
2186 | struct st_modedef *STm; |
2187 | char *name = tape_name(STp); |
2188 | struct cdev *cd0, *cd1; |
2189 | |
2190 | STm = &(STp->modes[STp->current_mode]); |
2191 | if (!STm->defined) { |
2192 | cd0 = STm->cdevs[0]; cd1 = STm->cdevs[1]; |
2193 | memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); |
2194 | STm->cdevs[0] = cd0; STm->cdevs[1] = cd1; |
2195 | modes_defined = 1; |
2196 | DEBC(printk(ST_DEB_MSG |
2197 | "%s: Initialized mode %d definition from mode 0\n", |
2198 | name, STp->current_mode)); |
2199 | } |
2200 | |
2201 | code = options & MT_ST_OPTIONS; |
2202 | if (code == MT_ST_BOOLEANS) { |
2203 | STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; |
2204 | STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; |
2205 | STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; |
2206 | STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; |
2207 | STp->two_fm = (options & MT_ST_TWO_FM) != 0; |
2208 | STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; |
2209 | STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; |
2210 | STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; |
2211 | STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; |
2212 | if ((STp->device)->scsi_level >= SCSI_2) |
2213 | STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; |
2214 | STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; |
2215 | STp->immediate = (options & MT_ST_NOWAIT) != 0; |
2216 | STm->sysv = (options & MT_ST_SYSV) != 0; |
2217 | STp->sili = (options & MT_ST_SILI) != 0; |
2218 | DEB( debugging = (options & MT_ST_DEBUGGING) != 0; |
2219 | st_log_options(STp, STm, name); ) |
2220 | } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { |
2221 | value = (code == MT_ST_SETBOOLEANS); |
2222 | if ((options & MT_ST_BUFFER_WRITES) != 0) |
2223 | STm->do_buffer_writes = value; |
2224 | if ((options & MT_ST_ASYNC_WRITES) != 0) |
2225 | STm->do_async_writes = value; |
2226 | if ((options & MT_ST_DEF_WRITES) != 0) |
2227 | STm->defaults_for_writes = value; |
2228 | if ((options & MT_ST_READ_AHEAD) != 0) |
2229 | STm->do_read_ahead = value; |
2230 | if ((options & MT_ST_TWO_FM) != 0) |
2231 | STp->two_fm = value; |
2232 | if ((options & MT_ST_FAST_MTEOM) != 0) |
2233 | STp->fast_mteom = value; |
2234 | if ((options & MT_ST_AUTO_LOCK) != 0) |
2235 | STp->do_auto_lock = value; |
2236 | if ((options & MT_ST_CAN_BSR) != 0) |
2237 | STp->can_bsr = value; |
2238 | if ((options & MT_ST_NO_BLKLIMS) != 0) |
2239 | STp->omit_blklims = value; |
2240 | if ((STp->device)->scsi_level >= SCSI_2 && |
2241 | (options & MT_ST_CAN_PARTITIONS) != 0) |
2242 | STp->can_partitions = value; |
2243 | if ((options & MT_ST_SCSI2LOGICAL) != 0) |
2244 | STp->scsi2_logical = value; |
2245 | if ((options & MT_ST_NOWAIT) != 0) |
2246 | STp->immediate = value; |
2247 | if ((options & MT_ST_SYSV) != 0) |
2248 | STm->sysv = value; |
2249 | if ((options & MT_ST_SILI) != 0) |
2250 | STp->sili = value; |
2251 | DEB( |
2252 | if ((options & MT_ST_DEBUGGING) != 0) |
2253 | debugging = value; |
2254 | st_log_options(STp, STm, name); ) |
2255 | } else if (code == MT_ST_WRITE_THRESHOLD) { |
2256 | /* Retained for compatibility */ |
2257 | } else if (code == MT_ST_DEF_BLKSIZE) { |
2258 | value = (options & ~MT_ST_OPTIONS); |
2259 | if (value == ~MT_ST_OPTIONS) { |
2260 | STm->default_blksize = (-1); |
2261 | DEBC( printk(KERN_INFO "%s: Default block size disabled.\n", name)); |
2262 | } else { |
2263 | STm->default_blksize = value; |
2264 | DEBC( printk(KERN_INFO "%s: Default block size set to %d bytes.\n", |
2265 | name, STm->default_blksize)); |
2266 | if (STp->ready == ST_READY) { |
2267 | STp->blksize_changed = 0; |
2268 | set_mode_densblk(STp, STm); |
2269 | } |
2270 | } |
2271 | } else if (code == MT_ST_TIMEOUTS) { |
2272 | value = (options & ~MT_ST_OPTIONS); |
2273 | if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { |
2274 | STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; |
2275 | DEBC( printk(KERN_INFO "%s: Long timeout set to %d seconds.\n", name, |
2276 | (value & ~MT_ST_SET_LONG_TIMEOUT))); |
2277 | } else { |
2278 | blk_queue_rq_timeout(STp->device->request_queue, |
2279 | value * HZ); |
2280 | DEBC( printk(KERN_INFO "%s: Normal timeout set to %d seconds.\n", |
2281 | name, value) ); |
2282 | } |
2283 | } else if (code == MT_ST_SET_CLN) { |
2284 | value = (options & ~MT_ST_OPTIONS) & 0xff; |
2285 | if (value != 0 && |
2286 | (value < EXTENDED_SENSE_START || |
2287 | value >= SCSI_SENSE_BUFFERSIZE)) |
2288 | return (-EINVAL); |
2289 | STp->cln_mode = value; |
2290 | STp->cln_sense_mask = (options >> 8) & 0xff; |
2291 | STp->cln_sense_value = (options >> 16) & 0xff; |
2292 | printk(KERN_INFO |
2293 | "%s: Cleaning request mode %d, mask %02x, value %02x\n", |
2294 | name, value, STp->cln_sense_mask, STp->cln_sense_value); |
2295 | } else if (code == MT_ST_DEF_OPTIONS) { |
2296 | code = (options & ~MT_ST_CLEAR_DEFAULT); |
2297 | value = (options & MT_ST_CLEAR_DEFAULT); |
2298 | if (code == MT_ST_DEF_DENSITY) { |
2299 | if (value == MT_ST_CLEAR_DEFAULT) { |
2300 | STm->default_density = (-1); |
2301 | DEBC( printk(KERN_INFO "%s: Density default disabled.\n", |
2302 | name)); |
2303 | } else { |
2304 | STm->default_density = value & 0xff; |
2305 | DEBC( printk(KERN_INFO "%s: Density default set to %x\n", |
2306 | name, STm->default_density)); |
2307 | if (STp->ready == ST_READY) { |
2308 | STp->density_changed = 0; |
2309 | set_mode_densblk(STp, STm); |
2310 | } |
2311 | } |
2312 | } else if (code == MT_ST_DEF_DRVBUFFER) { |
2313 | if (value == MT_ST_CLEAR_DEFAULT) { |
2314 | STp->default_drvbuffer = 0xff; |
2315 | DEBC( printk(KERN_INFO |
2316 | "%s: Drive buffer default disabled.\n", name)); |
2317 | } else { |
2318 | STp->default_drvbuffer = value & 7; |
2319 | DEBC( printk(KERN_INFO |
2320 | "%s: Drive buffer default set to %x\n", |
2321 | name, STp->default_drvbuffer)); |
2322 | if (STp->ready == ST_READY) |
2323 | st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer); |
2324 | } |
2325 | } else if (code == MT_ST_DEF_COMPRESSION) { |
2326 | if (value == MT_ST_CLEAR_DEFAULT) { |
2327 | STm->default_compression = ST_DONT_TOUCH; |
2328 | DEBC( printk(KERN_INFO |
2329 | "%s: Compression default disabled.\n", name)); |
2330 | } else { |
2331 | if ((value & 0xff00) != 0) { |
2332 | STp->c_algo = (value & 0xff00) >> 8; |
2333 | DEBC( printk(KERN_INFO "%s: Compression algorithm set to 0x%x.\n", |
2334 | name, STp->c_algo)); |
2335 | } |
2336 | if ((value & 0xff) != 0xff) { |
2337 | STm->default_compression = (value & 1 ? ST_YES : ST_NO); |
2338 | DEBC( printk(KERN_INFO "%s: Compression default set to %x\n", |
2339 | name, (value & 1))); |
2340 | if (STp->ready == ST_READY) { |
2341 | STp->compression_changed = 0; |
2342 | st_compression(STp, (STm->default_compression == ST_YES)); |
2343 | } |
2344 | } |
2345 | } |
2346 | } |
2347 | } else |
2348 | return (-EIO); |
2349 | |
2350 | return 0; |
2351 | } |
2352 | |
2353 | #define MODE_HEADER_LENGTH 4 |
2354 | |
2355 | /* Mode header and page byte offsets */ |
2356 | #define MH_OFF_DATA_LENGTH 0 |
2357 | #define MH_OFF_MEDIUM_TYPE 1 |
2358 | #define MH_OFF_DEV_SPECIFIC 2 |
2359 | #define MH_OFF_BDESCS_LENGTH 3 |
2360 | #define MP_OFF_PAGE_NBR 0 |
2361 | #define MP_OFF_PAGE_LENGTH 1 |
2362 | |
2363 | /* Mode header and page bit masks */ |
2364 | #define MH_BIT_WP 0x80 |
2365 | #define MP_MSK_PAGE_NBR 0x3f |
2366 | |
2367 | /* Don't return block descriptors */ |
2368 | #define MODE_SENSE_OMIT_BDESCS 0x08 |
2369 | |
2370 | #define MODE_SELECT_PAGE_FORMAT 0x10 |
2371 | |
2372 | /* Read a mode page into the tape buffer. The block descriptors are included |
2373 | if incl_block_descs is true. The page control is ored to the page number |
2374 | parameter, if necessary. */ |
2375 | static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) |
2376 | { |
2377 | unsigned char cmd[MAX_COMMAND_SIZE]; |
2378 | struct st_request *SRpnt; |
2379 | |
2380 | memset(cmd, 0, MAX_COMMAND_SIZE); |
2381 | cmd[0] = MODE_SENSE; |
2382 | if (omit_block_descs) |
2383 | cmd[1] = MODE_SENSE_OMIT_BDESCS; |
2384 | cmd[2] = page; |
2385 | cmd[4] = 255; |
2386 | |
2387 | SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE, |
2388 | STp->device->request_queue->rq_timeout, 0, 1); |
2389 | if (SRpnt == NULL) |
2390 | return (STp->buffer)->syscall_result; |
2391 | |
2392 | st_release_request(SRpnt); |
2393 | |
2394 | return STp->buffer->syscall_result; |
2395 | } |
2396 | |
2397 | |
2398 | /* Send the mode page in the tape buffer to the drive. Assumes that the mode data |
2399 | in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ |
2400 | static int write_mode_page(struct scsi_tape *STp, int page, int slow) |
2401 | { |
2402 | int pgo; |
2403 | unsigned char cmd[MAX_COMMAND_SIZE]; |
2404 | struct st_request *SRpnt; |
2405 | int timeout; |
2406 | |
2407 | memset(cmd, 0, MAX_COMMAND_SIZE); |
2408 | cmd[0] = MODE_SELECT; |
2409 | cmd[1] = MODE_SELECT_PAGE_FORMAT; |
2410 | pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH]; |
2411 | cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2; |
2412 | |
2413 | /* Clear reserved fields */ |
2414 | (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0; |
2415 | (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0; |
2416 | (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; |
2417 | (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; |
2418 | |
2419 | timeout = slow ? |
2420 | STp->long_timeout : STp->device->request_queue->rq_timeout; |
2421 | SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE, |
2422 | timeout, 0, 1); |
2423 | if (SRpnt == NULL) |
2424 | return (STp->buffer)->syscall_result; |
2425 | |
2426 | st_release_request(SRpnt); |
2427 | |
2428 | return STp->buffer->syscall_result; |
2429 | } |
2430 | |
2431 | |
2432 | #define COMPRESSION_PAGE 0x0f |
2433 | #define COMPRESSION_PAGE_LENGTH 16 |
2434 | |
2435 | #define CP_OFF_DCE_DCC 2 |
2436 | #define CP_OFF_C_ALGO 7 |
2437 | |
2438 | #define DCE_MASK 0x80 |
2439 | #define DCC_MASK 0x40 |
2440 | #define RED_MASK 0x60 |
2441 | |
2442 | |
2443 | /* Control the compression with mode page 15. Algorithm not changed if zero. |
2444 | |
2445 | The block descriptors are read and written because Sony SDT-7000 does not |
2446 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). |
2447 | Including block descriptors should not cause any harm to other drives. */ |
2448 | |
2449 | static int st_compression(struct scsi_tape * STp, int state) |
2450 | { |
2451 | int retval; |
2452 | int mpoffs; /* Offset to mode page start */ |
2453 | unsigned char *b_data = (STp->buffer)->b_data; |
2454 | DEB( char *name = tape_name(STp); ) |
2455 | |
2456 | if (STp->ready != ST_READY) |
2457 | return (-EIO); |
2458 | |
2459 | /* Read the current page contents */ |
2460 | retval = read_mode_page(STp, COMPRESSION_PAGE, 0); |
2461 | if (retval) { |
2462 | DEBC(printk(ST_DEB_MSG "%s: Compression mode page not supported.\n", |
2463 | name)); |
2464 | return (-EIO); |
2465 | } |
2466 | |
2467 | mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; |
2468 | DEBC(printk(ST_DEB_MSG "%s: Compression state is %d.\n", name, |
2469 | (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0))); |
2470 | |
2471 | /* Check if compression can be changed */ |
2472 | if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) { |
2473 | DEBC(printk(ST_DEB_MSG "%s: Compression not supported.\n", name)); |
2474 | return (-EIO); |
2475 | } |
2476 | |
2477 | /* Do the change */ |
2478 | if (state) { |
2479 | b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK; |
2480 | if (STp->c_algo != 0) |
2481 | b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo; |
2482 | } |
2483 | else { |
2484 | b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK; |
2485 | if (STp->c_algo != 0) |
2486 | b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */ |
2487 | } |
2488 | |
2489 | retval = write_mode_page(STp, COMPRESSION_PAGE, 0); |
2490 | if (retval) { |
2491 | DEBC(printk(ST_DEB_MSG "%s: Compression change failed.\n", name)); |
2492 | return (-EIO); |
2493 | } |
2494 | DEBC(printk(ST_DEB_MSG "%s: Compression state changed to %d.\n", |
2495 | name, state)); |
2496 | |
2497 | STp->compression_changed = 1; |
2498 | return 0; |
2499 | } |
2500 | |
2501 | |
2502 | /* Process the load and unload commands (does unload if the load code is zero) */ |
2503 | static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code) |
2504 | { |
2505 | int retval = (-EIO), timeout; |
2506 | DEB( char *name = tape_name(STp); ) |
2507 | unsigned char cmd[MAX_COMMAND_SIZE]; |
2508 | struct st_partstat *STps; |
2509 | struct st_request *SRpnt; |
2510 | |
2511 | if (STp->ready != ST_READY && !load_code) { |
2512 | if (STp->ready == ST_NO_TAPE) |
2513 | return (-ENOMEDIUM); |
2514 | else |
2515 | return (-EIO); |
2516 | } |
2517 | |
2518 | memset(cmd, 0, MAX_COMMAND_SIZE); |
2519 | cmd[0] = START_STOP; |
2520 | if (load_code) |
2521 | cmd[4] |= 1; |
2522 | /* |
2523 | * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A |
2524 | */ |
2525 | if (load_code >= 1 + MT_ST_HPLOADER_OFFSET |
2526 | && load_code <= 6 + MT_ST_HPLOADER_OFFSET) { |
2527 | DEBC(printk(ST_DEB_MSG "%s: Enhanced %sload slot %2d.\n", |
2528 | name, (cmd[4]) ? "" : "un", |
2529 | load_code - MT_ST_HPLOADER_OFFSET)); |
2530 | cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ |
2531 | } |
2532 | if (STp->immediate) { |
2533 | cmd[1] = 1; /* Don't wait for completion */ |
2534 | timeout = STp->device->request_queue->rq_timeout; |
2535 | } |
2536 | else |
2537 | timeout = STp->long_timeout; |
2538 | |
2539 | DEBC( |
2540 | if (!load_code) |
2541 | printk(ST_DEB_MSG "%s: Unloading tape.\n", name); |
2542 | else |
2543 | printk(ST_DEB_MSG "%s: Loading tape.\n", name); |
2544 | ); |
2545 | |
2546 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
2547 | timeout, MAX_RETRIES, 1); |
2548 | if (!SRpnt) |
2549 | return (STp->buffer)->syscall_result; |
2550 | |
2551 | retval = (STp->buffer)->syscall_result; |
2552 | st_release_request(SRpnt); |
2553 | |
2554 | if (!retval) { /* SCSI command successful */ |
2555 | |
2556 | if (!load_code) { |
2557 | STp->rew_at_close = 0; |
2558 | STp->ready = ST_NO_TAPE; |
2559 | } |
2560 | else { |
2561 | STp->rew_at_close = STp->autorew_dev; |
2562 | retval = check_tape(STp, filp); |
2563 | if (retval > 0) |
2564 | retval = 0; |
2565 | } |
2566 | } |
2567 | else { |
2568 | STps = &(STp->ps[STp->partition]); |
2569 | STps->drv_file = STps->drv_block = (-1); |
2570 | } |
2571 | |
2572 | return retval; |
2573 | } |
2574 | |
2575 | #if DEBUG |
2576 | #define ST_DEB_FORWARD 0 |
2577 | #define ST_DEB_BACKWARD 1 |
2578 | static void deb_space_print(char *name, int direction, char *units, unsigned char *cmd) |
2579 | { |
2580 | s32 sc; |
2581 | |
2582 | sc = cmd[2] & 0x80 ? 0xff000000 : 0; |
2583 | sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; |
2584 | if (direction) |
2585 | sc = -sc; |
2586 | printk(ST_DEB_MSG "%s: Spacing tape %s over %d %s.\n", name, |
2587 | direction ? "backward" : "forward", sc, units); |
2588 | } |
2589 | #endif |
2590 | |
2591 | |
2592 | /* Internal ioctl function */ |
2593 | static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) |
2594 | { |
2595 | int timeout; |
2596 | long ltmp; |
2597 | int ioctl_result; |
2598 | int chg_eof = 1; |
2599 | unsigned char cmd[MAX_COMMAND_SIZE]; |
2600 | struct st_request *SRpnt; |
2601 | struct st_partstat *STps; |
2602 | int fileno, blkno, at_sm, undone; |
2603 | int datalen = 0, direction = DMA_NONE; |
2604 | char *name = tape_name(STp); |
2605 | |
2606 | WARN_ON(STp->buffer->do_dio != 0); |
2607 | if (STp->ready != ST_READY) { |
2608 | if (STp->ready == ST_NO_TAPE) |
2609 | return (-ENOMEDIUM); |
2610 | else |
2611 | return (-EIO); |
2612 | } |
2613 | timeout = STp->long_timeout; |
2614 | STps = &(STp->ps[STp->partition]); |
2615 | fileno = STps->drv_file; |
2616 | blkno = STps->drv_block; |
2617 | at_sm = STps->at_sm; |
2618 | |
2619 | memset(cmd, 0, MAX_COMMAND_SIZE); |
2620 | switch (cmd_in) { |
2621 | case MTFSFM: |
2622 | chg_eof = 0; /* Changed from the FSF after this */ |
2623 | case MTFSF: |
2624 | cmd[0] = SPACE; |
2625 | cmd[1] = 0x01; /* Space FileMarks */ |
2626 | cmd[2] = (arg >> 16); |
2627 | cmd[3] = (arg >> 8); |
2628 | cmd[4] = arg; |
2629 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "filemarks", cmd);) |
2630 | if (fileno >= 0) |
2631 | fileno += arg; |
2632 | blkno = 0; |
2633 | at_sm &= (arg == 0); |
2634 | break; |
2635 | case MTBSFM: |
2636 | chg_eof = 0; /* Changed from the FSF after this */ |
2637 | case MTBSF: |
2638 | cmd[0] = SPACE; |
2639 | cmd[1] = 0x01; /* Space FileMarks */ |
2640 | ltmp = (-arg); |
2641 | cmd[2] = (ltmp >> 16); |
2642 | cmd[3] = (ltmp >> 8); |
2643 | cmd[4] = ltmp; |
2644 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "filemarks", cmd);) |
2645 | if (fileno >= 0) |
2646 | fileno -= arg; |
2647 | blkno = (-1); /* We can't know the block number */ |
2648 | at_sm &= (arg == 0); |
2649 | break; |
2650 | case MTFSR: |
2651 | cmd[0] = SPACE; |
2652 | cmd[1] = 0x00; /* Space Blocks */ |
2653 | cmd[2] = (arg >> 16); |
2654 | cmd[3] = (arg >> 8); |
2655 | cmd[4] = arg; |
2656 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "blocks", cmd);) |
2657 | if (blkno >= 0) |
2658 | blkno += arg; |
2659 | at_sm &= (arg == 0); |
2660 | break; |
2661 | case MTBSR: |
2662 | cmd[0] = SPACE; |
2663 | cmd[1] = 0x00; /* Space Blocks */ |
2664 | ltmp = (-arg); |
2665 | cmd[2] = (ltmp >> 16); |
2666 | cmd[3] = (ltmp >> 8); |
2667 | cmd[4] = ltmp; |
2668 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "blocks", cmd);) |
2669 | if (blkno >= 0) |
2670 | blkno -= arg; |
2671 | at_sm &= (arg == 0); |
2672 | break; |
2673 | case MTFSS: |
2674 | cmd[0] = SPACE; |
2675 | cmd[1] = 0x04; /* Space Setmarks */ |
2676 | cmd[2] = (arg >> 16); |
2677 | cmd[3] = (arg >> 8); |
2678 | cmd[4] = arg; |
2679 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "setmarks", cmd);) |
2680 | if (arg != 0) { |
2681 | blkno = fileno = (-1); |
2682 | at_sm = 1; |
2683 | } |
2684 | break; |
2685 | case MTBSS: |
2686 | cmd[0] = SPACE; |
2687 | cmd[1] = 0x04; /* Space Setmarks */ |
2688 | ltmp = (-arg); |
2689 | cmd[2] = (ltmp >> 16); |
2690 | cmd[3] = (ltmp >> 8); |
2691 | cmd[4] = ltmp; |
2692 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "setmarks", cmd);) |
2693 | if (arg != 0) { |
2694 | blkno = fileno = (-1); |
2695 | at_sm = 1; |
2696 | } |
2697 | break; |
2698 | case MTWEOF: |
2699 | case MTWSM: |
2700 | if (STp->write_prot) |
2701 | return (-EACCES); |
2702 | cmd[0] = WRITE_FILEMARKS; |
2703 | if (cmd_in == MTWSM) |
2704 | cmd[1] = 2; |
2705 | cmd[2] = (arg >> 16); |
2706 | cmd[3] = (arg >> 8); |
2707 | cmd[4] = arg; |
2708 | timeout = STp->device->request_queue->rq_timeout; |
2709 | DEBC( |
2710 | if (cmd_in == MTWEOF) |
2711 | printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name, |
2712 | cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); |
2713 | else |
2714 | printk(ST_DEB_MSG "%s: Writing %d setmarks.\n", name, |
2715 | cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); |
2716 | ) |
2717 | if (fileno >= 0) |
2718 | fileno += arg; |
2719 | blkno = 0; |
2720 | at_sm = (cmd_in == MTWSM); |
2721 | break; |
2722 | case MTREW: |
2723 | cmd[0] = REZERO_UNIT; |
2724 | if (STp->immediate) { |
2725 | cmd[1] = 1; /* Don't wait for completion */ |
2726 | timeout = STp->device->request_queue->rq_timeout; |
2727 | } |
2728 | DEBC(printk(ST_DEB_MSG "%s: Rewinding tape.\n", name)); |
2729 | fileno = blkno = at_sm = 0; |
2730 | break; |
2731 | case MTNOP: |
2732 | DEBC(printk(ST_DEB_MSG "%s: No op on tape.\n", name)); |
2733 | return 0; /* Should do something ? */ |
2734 | break; |
2735 | case MTRETEN: |
2736 | cmd[0] = START_STOP; |
2737 | if (STp->immediate) { |
2738 | cmd[1] = 1; /* Don't wait for completion */ |
2739 | timeout = STp->device->request_queue->rq_timeout; |
2740 | } |
2741 | cmd[4] = 3; |
2742 | DEBC(printk(ST_DEB_MSG "%s: Retensioning tape.\n", name)); |
2743 | fileno = blkno = at_sm = 0; |
2744 | break; |
2745 | case MTEOM: |
2746 | if (!STp->fast_mteom) { |
2747 | /* space to the end of tape */ |
2748 | ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); |
2749 | fileno = STps->drv_file; |
2750 | if (STps->eof >= ST_EOD_1) |
2751 | return 0; |
2752 | /* The next lines would hide the number of spaced FileMarks |
2753 | That's why I inserted the previous lines. I had no luck |
2754 | with detecting EOM with FSF, so we go now to EOM. |
2755 | Joerg Weule */ |
2756 | } else |
2757 | fileno = (-1); |
2758 | cmd[0] = SPACE; |
2759 | cmd[1] = 3; |
2760 | DEBC(printk(ST_DEB_MSG "%s: Spacing to end of recorded medium.\n", |
2761 | name)); |
2762 | blkno = -1; |
2763 | at_sm = 0; |
2764 | break; |
2765 | case MTERASE: |
2766 | if (STp->write_prot) |
2767 | return (-EACCES); |
2768 | cmd[0] = ERASE; |
2769 | cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ |
2770 | if (STp->immediate) { |
2771 | cmd[1] |= 2; /* Don't wait for completion */ |
2772 | timeout = STp->device->request_queue->rq_timeout; |
2773 | } |
2774 | else |
2775 | timeout = STp->long_timeout * 8; |
2776 | |
2777 | DEBC(printk(ST_DEB_MSG "%s: Erasing tape.\n", name)); |
2778 | fileno = blkno = at_sm = 0; |
2779 | break; |
2780 | case MTSETBLK: /* Set block length */ |
2781 | case MTSETDENSITY: /* Set tape density */ |
2782 | case MTSETDRVBUFFER: /* Set drive buffering */ |
2783 | case SET_DENS_AND_BLK: /* Set density and block size */ |
2784 | chg_eof = 0; |
2785 | if (STp->dirty || (STp->buffer)->buffer_bytes != 0) |
2786 | return (-EIO); /* Not allowed if data in buffer */ |
2787 | if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && |
2788 | (arg & MT_ST_BLKSIZE_MASK) != 0 && |
2789 | STp->max_block > 0 && |
2790 | ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || |
2791 | (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { |
2792 | printk(KERN_WARNING "%s: Illegal block size.\n", name); |
2793 | return (-EINVAL); |
2794 | } |
2795 | cmd[0] = MODE_SELECT; |
2796 | if ((STp->use_pf & USE_PF)) |
2797 | cmd[1] = MODE_SELECT_PAGE_FORMAT; |
2798 | cmd[4] = datalen = 12; |
2799 | direction = DMA_TO_DEVICE; |
2800 | |
2801 | memset((STp->buffer)->b_data, 0, 12); |
2802 | if (cmd_in == MTSETDRVBUFFER) |
2803 | (STp->buffer)->b_data[2] = (arg & 7) << 4; |
2804 | else |
2805 | (STp->buffer)->b_data[2] = |
2806 | STp->drv_buffer << 4; |
2807 | (STp->buffer)->b_data[3] = 8; /* block descriptor length */ |
2808 | if (cmd_in == MTSETDENSITY) { |
2809 | (STp->buffer)->b_data[4] = arg; |
2810 | STp->density_changed = 1; /* At least we tried ;-) */ |
2811 | } else if (cmd_in == SET_DENS_AND_BLK) |
2812 | (STp->buffer)->b_data[4] = arg >> 24; |
2813 | else |
2814 | (STp->buffer)->b_data[4] = STp->density; |
2815 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { |
2816 | ltmp = arg & MT_ST_BLKSIZE_MASK; |
2817 | if (cmd_in == MTSETBLK) |
2818 | STp->blksize_changed = 1; /* At least we tried ;-) */ |
2819 | } else |
2820 | ltmp = STp->block_size; |
2821 | (STp->buffer)->b_data[9] = (ltmp >> 16); |
2822 | (STp->buffer)->b_data[10] = (ltmp >> 8); |
2823 | (STp->buffer)->b_data[11] = ltmp; |
2824 | timeout = STp->device->request_queue->rq_timeout; |
2825 | DEBC( |
2826 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) |
2827 | printk(ST_DEB_MSG |
2828 | "%s: Setting block size to %d bytes.\n", name, |
2829 | (STp->buffer)->b_data[9] * 65536 + |
2830 | (STp->buffer)->b_data[10] * 256 + |
2831 | (STp->buffer)->b_data[11]); |
2832 | if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) |
2833 | printk(ST_DEB_MSG |
2834 | "%s: Setting density code to %x.\n", name, |
2835 | (STp->buffer)->b_data[4]); |
2836 | if (cmd_in == MTSETDRVBUFFER) |
2837 | printk(ST_DEB_MSG |
2838 | "%s: Setting drive buffer code to %d.\n", name, |
2839 | ((STp->buffer)->b_data[2] >> 4) & 7); |
2840 | ) |
2841 | break; |
2842 | default: |
2843 | return (-ENOSYS); |
2844 | } |
2845 | |
2846 | SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, |
2847 | timeout, MAX_RETRIES, 1); |
2848 | if (!SRpnt) |
2849 | return (STp->buffer)->syscall_result; |
2850 | |
2851 | ioctl_result = (STp->buffer)->syscall_result; |
2852 | |
2853 | if (!ioctl_result) { /* SCSI command successful */ |
2854 | st_release_request(SRpnt); |
2855 | SRpnt = NULL; |
2856 | STps->drv_block = blkno; |
2857 | STps->drv_file = fileno; |
2858 | STps->at_sm = at_sm; |
2859 | |
2860 | if (cmd_in == MTBSFM) |
2861 | ioctl_result = st_int_ioctl(STp, MTFSF, 1); |
2862 | else if (cmd_in == MTFSFM) |
2863 | ioctl_result = st_int_ioctl(STp, MTBSF, 1); |
2864 | |
2865 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { |
2866 | STp->block_size = arg & MT_ST_BLKSIZE_MASK; |
2867 | if (STp->block_size != 0) { |
2868 | (STp->buffer)->buffer_blocks = |
2869 | (STp->buffer)->buffer_size / STp->block_size; |
2870 | } |
2871 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; |
2872 | if (cmd_in == SET_DENS_AND_BLK) |
2873 | STp->density = arg >> MT_ST_DENSITY_SHIFT; |
2874 | } else if (cmd_in == MTSETDRVBUFFER) |
2875 | STp->drv_buffer = (arg & 7); |
2876 | else if (cmd_in == MTSETDENSITY) |
2877 | STp->density = arg; |
2878 | |
2879 | if (cmd_in == MTEOM) |
2880 | STps->eof = ST_EOD; |
2881 | else if (cmd_in == MTFSF) |
2882 | STps->eof = ST_FM; |
2883 | else if (chg_eof) |
2884 | STps->eof = ST_NOEOF; |
2885 | |
2886 | if (cmd_in == MTWEOF) |
2887 | STps->rw = ST_IDLE; |
2888 | } else { /* SCSI command was not completely successful. Don't return |
2889 | from this block without releasing the SCSI command block! */ |
2890 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; |
2891 | |
2892 | if (cmdstatp->flags & SENSE_EOM) { |
2893 | if (cmd_in != MTBSF && cmd_in != MTBSFM && |
2894 | cmd_in != MTBSR && cmd_in != MTBSS) |
2895 | STps->eof = ST_EOM_OK; |
2896 | STps->drv_block = 0; |
2897 | } |
2898 | |
2899 | if (cmdstatp->remainder_valid) |
2900 | undone = (int)cmdstatp->uremainder64; |
2901 | else |
2902 | undone = 0; |
2903 | |
2904 | if (cmd_in == MTWEOF && |
2905 | cmdstatp->have_sense && |
2906 | (cmdstatp->flags & SENSE_EOM)) { |
2907 | if (cmdstatp->sense_hdr.sense_key == NO_SENSE || |
2908 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { |
2909 | ioctl_result = 0; /* EOF(s) written successfully at EOM */ |
2910 | STps->eof = ST_NOEOF; |
2911 | } else { /* Writing EOF(s) failed */ |
2912 | if (fileno >= 0) |
2913 | fileno -= undone; |
2914 | if (undone < arg) |
2915 | STps->eof = ST_NOEOF; |
2916 | } |
2917 | STps->drv_file = fileno; |
2918 | } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { |
2919 | if (fileno >= 0) |
2920 | STps->drv_file = fileno - undone; |
2921 | else |
2922 | STps->drv_file = fileno; |
2923 | STps->drv_block = -1; |
2924 | STps->eof = ST_NOEOF; |
2925 | } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { |
2926 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ |
2927 | undone = (-undone); |
2928 | if (STps->drv_file >= 0) |
2929 | STps->drv_file = fileno + undone; |
2930 | STps->drv_block = 0; |
2931 | STps->eof = ST_NOEOF; |
2932 | } else if (cmd_in == MTFSR) { |
2933 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ |
2934 | if (STps->drv_file >= 0) |
2935 | STps->drv_file++; |
2936 | STps->drv_block = 0; |
2937 | STps->eof = ST_FM; |
2938 | } else { |
2939 | if (blkno >= undone) |
2940 | STps->drv_block = blkno - undone; |
2941 | else |
2942 | STps->drv_block = (-1); |
2943 | STps->eof = ST_NOEOF; |
2944 | } |
2945 | } else if (cmd_in == MTBSR) { |
2946 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ |
2947 | STps->drv_file--; |
2948 | STps->drv_block = (-1); |
2949 | } else { |
2950 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ |
2951 | undone = (-undone); |
2952 | if (STps->drv_block >= 0) |
2953 | STps->drv_block = blkno + undone; |
2954 | } |
2955 | STps->eof = ST_NOEOF; |
2956 | } else if (cmd_in == MTEOM) { |
2957 | STps->drv_file = (-1); |
2958 | STps->drv_block = (-1); |
2959 | STps->eof = ST_EOD; |
2960 | } else if (cmd_in == MTSETBLK || |
2961 | cmd_in == MTSETDENSITY || |
2962 | cmd_in == MTSETDRVBUFFER || |
2963 | cmd_in == SET_DENS_AND_BLK) { |
2964 | if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && |
2965 | !(STp->use_pf & PF_TESTED)) { |
2966 | /* Try the other possible state of Page Format if not |
2967 | already tried */ |
2968 | STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED; |
2969 | st_release_request(SRpnt); |
2970 | SRpnt = NULL; |
2971 | return st_int_ioctl(STp, cmd_in, arg); |
2972 | } |
2973 | } else if (chg_eof) |
2974 | STps->eof = ST_NOEOF; |
2975 | |
2976 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) |
2977 | STps->eof = ST_EOD; |
2978 | |
2979 | st_release_request(SRpnt); |
2980 | SRpnt = NULL; |
2981 | } |
2982 | |
2983 | return ioctl_result; |
2984 | } |
2985 | |
2986 | |
2987 | /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc |
2988 | structure. */ |
2989 | |
2990 | static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, |
2991 | int logical) |
2992 | { |
2993 | int result; |
2994 | unsigned char scmd[MAX_COMMAND_SIZE]; |
2995 | struct st_request *SRpnt; |
2996 | DEB( char *name = tape_name(STp); ) |
2997 | |
2998 | if (STp->ready != ST_READY) |
2999 | return (-EIO); |
3000 | |
3001 | memset(scmd, 0, MAX_COMMAND_SIZE); |
3002 | if ((STp->device)->scsi_level < SCSI_2) { |
3003 | scmd[0] = QFA_REQUEST_BLOCK; |
3004 | scmd[4] = 3; |
3005 | } else { |
3006 | scmd[0] = READ_POSITION; |
3007 | if (!logical && !STp->scsi2_logical) |
3008 | scmd[1] = 1; |
3009 | } |
3010 | SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, |
3011 | STp->device->request_queue->rq_timeout, |
3012 | MAX_READY_RETRIES, 1); |
3013 | if (!SRpnt) |
3014 | return (STp->buffer)->syscall_result; |
3015 | |
3016 | if ((STp->buffer)->syscall_result != 0 || |
3017 | (STp->device->scsi_level >= SCSI_2 && |
3018 | ((STp->buffer)->b_data[0] & 4) != 0)) { |
3019 | *block = *partition = 0; |
3020 | DEBC(printk(ST_DEB_MSG "%s: Can't read tape position.\n", name)); |
3021 | result = (-EIO); |
3022 | } else { |
3023 | result = 0; |
3024 | if ((STp->device)->scsi_level < SCSI_2) { |
3025 | *block = ((STp->buffer)->b_data[0] << 16) |
3026 | + ((STp->buffer)->b_data[1] << 8) |
3027 | + (STp->buffer)->b_data[2]; |
3028 | *partition = 0; |
3029 | } else { |
3030 | *block = ((STp->buffer)->b_data[4] << 24) |
3031 | + ((STp->buffer)->b_data[5] << 16) |
3032 | + ((STp->buffer)->b_data[6] << 8) |
3033 | + (STp->buffer)->b_data[7]; |
3034 | *partition = (STp->buffer)->b_data[1]; |
3035 | if (((STp->buffer)->b_data[0] & 0x80) && |
3036 | (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ |
3037 | STp->ps[0].drv_block = STp->ps[0].drv_file = 0; |
3038 | } |
3039 | DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name, |
3040 | *block, *partition)); |
3041 | } |
3042 | st_release_request(SRpnt); |
3043 | SRpnt = NULL; |
3044 | |
3045 | return result; |
3046 | } |
3047 | |
3048 | |
3049 | /* Set the tape block and partition. Negative partition means that only the |
3050 | block should be set in vendor specific way. */ |
3051 | static int set_location(struct scsi_tape *STp, unsigned int block, int partition, |
3052 | int logical) |
3053 | { |
3054 | struct st_partstat *STps; |
3055 | int result, p; |
3056 | unsigned int blk; |
3057 | int timeout; |
3058 | unsigned char scmd[MAX_COMMAND_SIZE]; |
3059 | struct st_request *SRpnt; |
3060 | DEB( char *name = tape_name(STp); ) |
3061 | |
3062 | if (STp->ready != ST_READY) |
3063 | return (-EIO); |
3064 | timeout = STp->long_timeout; |
3065 | STps = &(STp->ps[STp->partition]); |
3066 | |
3067 | DEBC(printk(ST_DEB_MSG "%s: Setting block to %d and partition to %d.\n", |
3068 | name, block, partition)); |
3069 | DEB(if (partition < 0) |
3070 | return (-EIO); ) |
3071 | |
3072 | /* Update the location at the partition we are leaving */ |
3073 | if ((!STp->can_partitions && partition != 0) || |
3074 | partition >= ST_NBR_PARTITIONS) |
3075 | return (-EINVAL); |
3076 | if (partition != STp->partition) { |
3077 | if (get_location(STp, &blk, &p, 1)) |
3078 | STps->last_block_valid = 0; |
3079 | else { |
3080 | STps->last_block_valid = 1; |
3081 | STps->last_block_visited = blk; |
3082 | DEBC(printk(ST_DEB_MSG |
3083 | "%s: Visited block %d for partition %d saved.\n", |
3084 | name, blk, STp->partition)); |
3085 | } |
3086 | } |
3087 | |
3088 | memset(scmd, 0, MAX_COMMAND_SIZE); |
3089 | if ((STp->device)->scsi_level < SCSI_2) { |
3090 | scmd[0] = QFA_SEEK_BLOCK; |
3091 | scmd[2] = (block >> 16); |
3092 | scmd[3] = (block >> 8); |
3093 | scmd[4] = block; |
3094 | scmd[5] = 0; |
3095 | } else { |
3096 | scmd[0] = SEEK_10; |
3097 | scmd[3] = (block >> 24); |
3098 | scmd[4] = (block >> 16); |
3099 | scmd[5] = (block >> 8); |
3100 | scmd[6] = block; |
3101 | if (!logical && !STp->scsi2_logical) |
3102 | scmd[1] = 4; |
3103 | if (STp->partition != partition) { |
3104 | scmd[1] |= 2; |
3105 | scmd[8] = partition; |
3106 | DEBC(printk(ST_DEB_MSG |
3107 | "%s: Trying to change partition from %d to %d\n", |
3108 | name, STp->partition, partition)); |
3109 | } |
3110 | } |
3111 | if (STp->immediate) { |
3112 | scmd[1] |= 1; /* Don't wait for completion */ |
3113 | timeout = STp->device->request_queue->rq_timeout; |
3114 | } |
3115 | |
3116 | SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, |
3117 | timeout, MAX_READY_RETRIES, 1); |
3118 | if (!SRpnt) |
3119 | return (STp->buffer)->syscall_result; |
3120 | |
3121 | STps->drv_block = STps->drv_file = (-1); |
3122 | STps->eof = ST_NOEOF; |
3123 | if ((STp->buffer)->syscall_result != 0) { |
3124 | result = (-EIO); |
3125 | if (STp->can_partitions && |
3126 | (STp->device)->scsi_level >= SCSI_2 && |
3127 | (p = find_partition(STp)) >= 0) |
3128 | STp->partition = p; |
3129 | } else { |
3130 | if (STp->can_partitions) { |
3131 | STp->partition = partition; |
3132 | STps = &(STp->ps[partition]); |
3133 | if (!STps->last_block_valid || |
3134 | STps->last_block_visited != block) { |
3135 | STps->at_sm = 0; |
3136 | STps->rw = ST_IDLE; |
3137 | } |
3138 | } else |
3139 | STps->at_sm = 0; |
3140 | if (block == 0) |
3141 | STps->drv_block = STps->drv_file = 0; |
3142 | result = 0; |
3143 | } |
3144 | |
3145 | st_release_request(SRpnt); |
3146 | SRpnt = NULL; |
3147 | |
3148 | return result; |
3149 | } |
3150 | |
3151 | |
3152 | /* Find the current partition number for the drive status. Called from open and |
3153 | returns either partition number of negative error code. */ |
3154 | static int find_partition(struct scsi_tape *STp) |
3155 | { |
3156 | int i, partition; |
3157 | unsigned int block; |
3158 | |
3159 | if ((i = get_location(STp, &block, &partition, 1)) < 0) |
3160 | return i; |
3161 | if (partition >= ST_NBR_PARTITIONS) |
3162 | return (-EIO); |
3163 | return partition; |
3164 | } |
3165 | |
3166 | |
3167 | /* Change the partition if necessary */ |
3168 | static int switch_partition(struct scsi_tape *STp) |
3169 | { |
3170 | struct st_partstat *STps; |
3171 | |
3172 | if (STp->partition == STp->new_partition) |
3173 | return 0; |
3174 | STps = &(STp->ps[STp->new_partition]); |
3175 | if (!STps->last_block_valid) |
3176 | STps->last_block_visited = 0; |
3177 | return set_location(STp, STps->last_block_visited, STp->new_partition, 1); |
3178 | } |
3179 | |
3180 | /* Functions for reading and writing the medium partition mode page. */ |
3181 | |
3182 | #define PART_PAGE 0x11 |
3183 | #define PART_PAGE_FIXED_LENGTH 8 |
3184 | |
3185 | #define PP_OFF_MAX_ADD_PARTS 2 |
3186 | #define PP_OFF_NBR_ADD_PARTS 3 |
3187 | #define PP_OFF_FLAGS 4 |
3188 | #define PP_OFF_PART_UNITS 6 |
3189 | #define PP_OFF_RESERVED 7 |
3190 | |
3191 | #define PP_BIT_IDP 0x20 |
3192 | #define PP_MSK_PSUM_MB 0x10 |
3193 | |
3194 | /* Get the number of partitions on the tape. As a side effect reads the |
3195 | mode page into the tape buffer. */ |
3196 | static int nbr_partitions(struct scsi_tape *STp) |
3197 | { |
3198 | int result; |
3199 | DEB( char *name = tape_name(STp); ) |
3200 | |
3201 | if (STp->ready != ST_READY) |
3202 | return (-EIO); |
3203 | |
3204 | result = read_mode_page(STp, PART_PAGE, 1); |
3205 | |
3206 | if (result) { |
3207 | DEBC(printk(ST_DEB_MSG "%s: Can't read medium partition page.\n", |
3208 | name)); |
3209 | result = (-EIO); |
3210 | } else { |
3211 | result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + |
3212 | PP_OFF_NBR_ADD_PARTS] + 1; |
3213 | DEBC(printk(ST_DEB_MSG "%s: Number of partitions %d.\n", name, result)); |
3214 | } |
3215 | |
3216 | return result; |
3217 | } |
3218 | |
3219 | |
3220 | /* Partition the tape into two partitions if size > 0 or one partition if |
3221 | size == 0. |
3222 | |
3223 | The block descriptors are read and written because Sony SDT-7000 does not |
3224 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). |
3225 | |
3226 | My HP C1533A drive returns only one partition size field. This is used to |
3227 | set the size of partition 1. There is no size field for the default partition. |
3228 | Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is |
3229 | used to set the size of partition 1 (this is what the SCSI-3 standard specifies). |
3230 | The following algorithm is used to accommodate both drives: if the number of |
3231 | partition size fields is greater than the maximum number of additional partitions |
3232 | in the mode page, the second field is used. Otherwise the first field is used. |
3233 | |
3234 | For Seagate DDS drives the page length must be 8 when no partitions is defined |
3235 | and 10 when 1 partition is defined (information from Eric Lee Green). This is |
3236 | is acceptable also to some other old drives and enforced if the first partition |
3237 | size field is used for the first additional partition size. |
3238 | */ |
3239 | static int partition_tape(struct scsi_tape *STp, int size) |
3240 | { |
3241 | char *name = tape_name(STp); |
3242 | int result; |
3243 | int pgo, psd_cnt, psdo; |
3244 | unsigned char *bp; |
3245 | |
3246 | result = read_mode_page(STp, PART_PAGE, 0); |
3247 | if (result) { |
3248 | DEBC(printk(ST_DEB_MSG "%s: Can't read partition mode page.\n", name)); |
3249 | return result; |
3250 | } |
3251 | /* The mode page is in the buffer. Let's modify it and write it. */ |
3252 | bp = (STp->buffer)->b_data; |
3253 | pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; |
3254 | DEBC(printk(ST_DEB_MSG "%s: Partition page length is %d bytes.\n", |
3255 | name, bp[pgo + MP_OFF_PAGE_LENGTH] + 2)); |
3256 | |
3257 | psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; |
3258 | psdo = pgo + PART_PAGE_FIXED_LENGTH; |
3259 | if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) { |
3260 | bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */ |
3261 | psdo += 2; |
3262 | } |
3263 | memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); |
3264 | |
3265 | DEBC(printk("%s: psd_cnt %d, max.parts %d, nbr_parts %d\n", name, |
3266 | psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], |
3267 | bp[pgo + PP_OFF_NBR_ADD_PARTS])); |
3268 | |
3269 | if (size <= 0) { |
3270 | bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; |
3271 | if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) |
3272 | bp[pgo + MP_OFF_PAGE_LENGTH] = 6; |
3273 | DEBC(printk(ST_DEB_MSG "%s: Formatting tape with one partition.\n", |
3274 | name)); |
3275 | } else { |
3276 | bp[psdo] = (size >> 8) & 0xff; |
3277 | bp[psdo + 1] = size & 0xff; |
3278 | bp[pgo + 3] = 1; |
3279 | if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) |
3280 | bp[pgo + MP_OFF_PAGE_LENGTH] = 8; |
3281 | DEBC(printk(ST_DEB_MSG |
3282 | "%s: Formatting tape with two partitions (1 = %d MB).\n", |
3283 | name, size)); |
3284 | } |
3285 | bp[pgo + PP_OFF_PART_UNITS] = 0; |
3286 | bp[pgo + PP_OFF_RESERVED] = 0; |
3287 | bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB; |
3288 | |
3289 | result = write_mode_page(STp, PART_PAGE, 1); |
3290 | if (result) { |
3291 | printk(KERN_INFO "%s: Partitioning of tape failed.\n", name); |
3292 | result = (-EIO); |
3293 | } |
3294 | |
3295 | return result; |
3296 | } |
3297 | |
3298 | |
3299 | |
3300 | /* The ioctl command */ |
3301 | static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) |
3302 | { |
3303 | int i, cmd_nr, cmd_type, bt; |
3304 | int retval = 0; |
3305 | unsigned int blk; |
3306 | struct scsi_tape *STp = file->private_data; |
3307 | struct st_modedef *STm; |
3308 | struct st_partstat *STps; |
3309 | char *name = tape_name(STp); |
3310 | void __user *p = (void __user *)arg; |
3311 | |
3312 | if (mutex_lock_interruptible(&STp->lock)) |
3313 | return -ERESTARTSYS; |
3314 | |
3315 | DEB( |
3316 | if (debugging && !STp->in_use) { |
3317 | printk(ST_DEB_MSG "%s: Incorrect device.\n", name); |
3318 | retval = (-EIO); |
3319 | goto out; |
3320 | } ) /* end DEB */ |
3321 | |
3322 | STm = &(STp->modes[STp->current_mode]); |
3323 | STps = &(STp->ps[STp->partition]); |
3324 | |
3325 | /* |
3326 | * If we are in the middle of error recovery, don't let anyone |
3327 | * else try and use this device. Also, if error recovery fails, it |
3328 | * may try and take the device offline, in which case all further |
3329 | * access to the device is prohibited. |
3330 | */ |
3331 | retval = scsi_nonblockable_ioctl(STp->device, cmd_in, p, |
3332 | file->f_flags & O_NDELAY); |
3333 | if (!scsi_block_when_processing_errors(STp->device) || retval != -ENODEV) |
3334 | goto out; |
3335 | retval = 0; |
3336 | |
3337 | cmd_type = _IOC_TYPE(cmd_in); |
3338 | cmd_nr = _IOC_NR(cmd_in); |
3339 | |
3340 | if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { |
3341 | struct mtop mtc; |
3342 | |
3343 | if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { |
3344 | retval = (-EINVAL); |
3345 | goto out; |
3346 | } |
3347 | |
3348 | i = copy_from_user(&mtc, p, sizeof(struct mtop)); |
3349 | if (i) { |
3350 | retval = (-EFAULT); |
3351 | goto out; |
3352 | } |
3353 | |
3354 | if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { |
3355 | printk(KERN_WARNING |
3356 | "%s: MTSETDRVBUFFER only allowed for root.\n", name); |
3357 | retval = (-EPERM); |
3358 | goto out; |
3359 | } |
3360 | if (!STm->defined && |
3361 | (mtc.mt_op != MTSETDRVBUFFER && |
3362 | (mtc.mt_count & MT_ST_OPTIONS) == 0)) { |
3363 | retval = (-ENXIO); |
3364 | goto out; |
3365 | } |
3366 | |
3367 | if (!STp->pos_unknown) { |
3368 | |
3369 | if (STps->eof == ST_FM_HIT) { |
3370 | if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || |
3371 | mtc.mt_op == MTEOM) { |
3372 | mtc.mt_count -= 1; |
3373 | if (STps->drv_file >= 0) |
3374 | STps->drv_file += 1; |
3375 | } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { |
3376 | mtc.mt_count += 1; |
3377 | if (STps->drv_file >= 0) |
3378 | STps->drv_file += 1; |
3379 | } |
3380 | } |
3381 | |
3382 | if (mtc.mt_op == MTSEEK) { |
3383 | /* Old position must be restored if partition will be |
3384 | changed */ |
3385 | i = !STp->can_partitions || |
3386 | (STp->new_partition != STp->partition); |
3387 | } else { |
3388 | i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || |
3389 | mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || |
3390 | mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || |
3391 | mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || |
3392 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || |
3393 | mtc.mt_op == MTCOMPRESSION; |
3394 | } |
3395 | i = flush_buffer(STp, i); |
3396 | if (i < 0) { |
3397 | retval = i; |
3398 | goto out; |
3399 | } |
3400 | if (STps->rw == ST_WRITING && |
3401 | (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || |
3402 | mtc.mt_op == MTSEEK || |
3403 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { |
3404 | i = st_int_ioctl(STp, MTWEOF, 1); |
3405 | if (i < 0) { |
3406 | retval = i; |
3407 | goto out; |
3408 | } |
3409 | if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) |
3410 | mtc.mt_count++; |
3411 | STps->rw = ST_IDLE; |
3412 | } |
3413 | |
3414 | } else { |
3415 | /* |
3416 | * If there was a bus reset, block further access |
3417 | * to this device. If the user wants to rewind the tape, |
3418 | * then reset the flag and allow access again. |
3419 | */ |
3420 | if (mtc.mt_op != MTREW && |
3421 | mtc.mt_op != MTOFFL && |
3422 | mtc.mt_op != MTRETEN && |
3423 | mtc.mt_op != MTERASE && |
3424 | mtc.mt_op != MTSEEK && |
3425 | mtc.mt_op != MTEOM) { |
3426 | retval = (-EIO); |
3427 | goto out; |
3428 | } |
3429 | reset_state(STp); |
3430 | /* remove this when the midlevel properly clears was_reset */ |
3431 | STp->device->was_reset = 0; |
3432 | } |
3433 | |
3434 | if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && |
3435 | mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && |
3436 | mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) |
3437 | STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ |
3438 | |
3439 | if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) |
3440 | do_door_lock(STp, 0); /* Ignore result! */ |
3441 | |
3442 | if (mtc.mt_op == MTSETDRVBUFFER && |
3443 | (mtc.mt_count & MT_ST_OPTIONS) != 0) { |
3444 | retval = st_set_options(STp, mtc.mt_count); |
3445 | goto out; |
3446 | } |
3447 | |
3448 | if (mtc.mt_op == MTSETPART) { |
3449 | if (!STp->can_partitions || |
3450 | mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { |
3451 | retval = (-EINVAL); |
3452 | goto out; |
3453 | } |
3454 | if (mtc.mt_count >= STp->nbr_partitions && |
3455 | (STp->nbr_partitions = nbr_partitions(STp)) < 0) { |
3456 | retval = (-EIO); |
3457 | goto out; |
3458 | } |
3459 | if (mtc.mt_count >= STp->nbr_partitions) { |
3460 | retval = (-EINVAL); |
3461 | goto out; |
3462 | } |
3463 | STp->new_partition = mtc.mt_count; |
3464 | retval = 0; |
3465 | goto out; |
3466 | } |
3467 | |
3468 | if (mtc.mt_op == MTMKPART) { |
3469 | if (!STp->can_partitions) { |
3470 | retval = (-EINVAL); |
3471 | goto out; |
3472 | } |
3473 | if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 || |
3474 | (i = partition_tape(STp, mtc.mt_count)) < 0) { |
3475 | retval = i; |
3476 | goto out; |
3477 | } |
3478 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { |
3479 | STp->ps[i].rw = ST_IDLE; |
3480 | STp->ps[i].at_sm = 0; |
3481 | STp->ps[i].last_block_valid = 0; |
3482 | } |
3483 | STp->partition = STp->new_partition = 0; |
3484 | STp->nbr_partitions = 1; /* Bad guess ?-) */ |
3485 | STps->drv_block = STps->drv_file = 0; |
3486 | retval = 0; |
3487 | goto out; |
3488 | } |
3489 | |
3490 | if (mtc.mt_op == MTSEEK) { |
3491 | i = set_location(STp, mtc.mt_count, STp->new_partition, 0); |
3492 | if (!STp->can_partitions) |
3493 | STp->ps[0].rw = ST_IDLE; |
3494 | retval = i; |
3495 | goto out; |
3496 | } |
3497 | |
3498 | if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { |
3499 | retval = do_load_unload(STp, file, 0); |
3500 | goto out; |
3501 | } |
3502 | |
3503 | if (mtc.mt_op == MTLOAD) { |
3504 | retval = do_load_unload(STp, file, max(1, mtc.mt_count)); |
3505 | goto out; |
3506 | } |
3507 | |
3508 | if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { |
3509 | retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); |
3510 | goto out; |
3511 | } |
3512 | |
3513 | if (STp->can_partitions && STp->ready == ST_READY && |
3514 | (i = switch_partition(STp)) < 0) { |
3515 | retval = i; |
3516 | goto out; |
3517 | } |
3518 | |
3519 | if (mtc.mt_op == MTCOMPRESSION) |
3520 | retval = st_compression(STp, (mtc.mt_count & 1)); |
3521 | else |
3522 | retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); |
3523 | goto out; |
3524 | } |
3525 | if (!STm->defined) { |
3526 | retval = (-ENXIO); |
3527 | goto out; |
3528 | } |
3529 | |
3530 | if ((i = flush_buffer(STp, 0)) < 0) { |
3531 | retval = i; |
3532 | goto out; |
3533 | } |
3534 | if (STp->can_partitions && |
3535 | (i = switch_partition(STp)) < 0) { |
3536 | retval = i; |
3537 | goto out; |
3538 | } |
3539 | |
3540 | if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { |
3541 | struct mtget mt_status; |
3542 | |
3543 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { |
3544 | retval = (-EINVAL); |
3545 | goto out; |
3546 | } |
3547 | |
3548 | mt_status.mt_type = STp->tape_type; |
3549 | mt_status.mt_dsreg = |
3550 | ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | |
3551 | ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); |
3552 | mt_status.mt_blkno = STps->drv_block; |
3553 | mt_status.mt_fileno = STps->drv_file; |
3554 | if (STp->block_size != 0) { |
3555 | if (STps->rw == ST_WRITING) |
3556 | mt_status.mt_blkno += |
3557 | (STp->buffer)->buffer_bytes / STp->block_size; |
3558 | else if (STps->rw == ST_READING) |
3559 | mt_status.mt_blkno -= |
3560 | ((STp->buffer)->buffer_bytes + |
3561 | STp->block_size - 1) / STp->block_size; |
3562 | } |
3563 | |
3564 | mt_status.mt_gstat = 0; |
3565 | if (STp->drv_write_prot) |
3566 | mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); |
3567 | if (mt_status.mt_blkno == 0) { |
3568 | if (mt_status.mt_fileno == 0) |
3569 | mt_status.mt_gstat |= GMT_BOT(0xffffffff); |
3570 | else |
3571 | mt_status.mt_gstat |= GMT_EOF(0xffffffff); |
3572 | } |
3573 | mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); |
3574 | mt_status.mt_resid = STp->partition; |
3575 | if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) |
3576 | mt_status.mt_gstat |= GMT_EOT(0xffffffff); |
3577 | else if (STps->eof >= ST_EOM_OK) |
3578 | mt_status.mt_gstat |= GMT_EOD(0xffffffff); |
3579 | if (STp->density == 1) |
3580 | mt_status.mt_gstat |= GMT_D_800(0xffffffff); |
3581 | else if (STp->density == 2) |
3582 | mt_status.mt_gstat |= GMT_D_1600(0xffffffff); |
3583 | else if (STp->density == 3) |
3584 | mt_status.mt_gstat |= GMT_D_6250(0xffffffff); |
3585 | if (STp->ready == ST_READY) |
3586 | mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); |
3587 | if (STp->ready == ST_NO_TAPE) |
3588 | mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); |
3589 | if (STps->at_sm) |
3590 | mt_status.mt_gstat |= GMT_SM(0xffffffff); |
3591 | if (STm->do_async_writes || |
3592 | (STm->do_buffer_writes && STp->block_size != 0) || |
3593 | STp->drv_buffer != 0) |
3594 | mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); |
3595 | if (STp->cleaning_req) |
3596 | mt_status.mt_gstat |= GMT_CLN(0xffffffff); |
3597 | |
3598 | i = copy_to_user(p, &mt_status, sizeof(struct mtget)); |
3599 | if (i) { |
3600 | retval = (-EFAULT); |
3601 | goto out; |
3602 | } |
3603 | |
3604 | STp->recover_reg = 0; /* Clear after read */ |
3605 | retval = 0; |
3606 | goto out; |
3607 | } /* End of MTIOCGET */ |
3608 | if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { |
3609 | struct mtpos mt_pos; |
3610 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { |
3611 | retval = (-EINVAL); |
3612 | goto out; |
3613 | } |
3614 | if ((i = get_location(STp, &blk, &bt, 0)) < 0) { |
3615 | retval = i; |
3616 | goto out; |
3617 | } |
3618 | mt_pos.mt_blkno = blk; |
3619 | i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); |
3620 | if (i) |
3621 | retval = (-EFAULT); |
3622 | goto out; |
3623 | } |
3624 | mutex_unlock(&STp->lock); |
3625 | switch (cmd_in) { |
3626 | case SCSI_IOCTL_GET_IDLUN: |
3627 | case SCSI_IOCTL_GET_BUS_NUMBER: |
3628 | break; |
3629 | default: |
3630 | if ((cmd_in == SG_IO || |
3631 | cmd_in == SCSI_IOCTL_SEND_COMMAND || |
3632 | cmd_in == CDROM_SEND_PACKET) && |
3633 | !capable(CAP_SYS_RAWIO)) |
3634 | i = -EPERM; |
3635 | else |
3636 | i = scsi_cmd_ioctl(STp->disk->queue, STp->disk, |
3637 | file->f_mode, cmd_in, p); |
3638 | if (i != -ENOTTY) |
3639 | return i; |
3640 | break; |
3641 | } |
3642 | retval = scsi_ioctl(STp->device, cmd_in, p); |
3643 | if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */ |
3644 | STp->rew_at_close = 0; |
3645 | STp->ready = ST_NO_TAPE; |
3646 | } |
3647 | return retval; |
3648 | |
3649 | out: |
3650 | mutex_unlock(&STp->lock); |
3651 | return retval; |
3652 | } |
3653 | |
3654 | #ifdef CONFIG_COMPAT |
3655 | static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
3656 | { |
3657 | struct scsi_tape *STp = file->private_data; |
3658 | struct scsi_device *sdev = STp->device; |
3659 | int ret = -ENOIOCTLCMD; |
3660 | if (sdev->host->hostt->compat_ioctl) { |
3661 | |
3662 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); |
3663 | |
3664 | } |
3665 | return ret; |
3666 | } |
3667 | #endif |
3668 | |
3669 | |
3670 | |
3671 | /* Try to allocate a new tape buffer. Calling function must not hold |
3672 | dev_arr_lock. */ |
3673 | static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) |
3674 | { |
3675 | struct st_buffer *tb; |
3676 | |
3677 | tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC); |
3678 | if (!tb) { |
3679 | printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); |
3680 | return NULL; |
3681 | } |
3682 | tb->frp_segs = 0; |
3683 | tb->use_sg = max_sg; |
3684 | tb->dma = need_dma; |
3685 | tb->buffer_size = 0; |
3686 | |
3687 | tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *), |
3688 | GFP_ATOMIC); |
3689 | if (!tb->reserved_pages) { |
3690 | kfree(tb); |
3691 | return NULL; |
3692 | } |
3693 | |
3694 | return tb; |
3695 | } |
3696 | |
3697 | |
3698 | /* Try to allocate enough space in the tape buffer */ |
3699 | #define ST_MAX_ORDER 6 |
3700 | |
3701 | static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) |
3702 | { |
3703 | int segs, nbr, max_segs, b_size, order, got; |
3704 | gfp_t priority; |
3705 | |
3706 | if (new_size <= STbuffer->buffer_size) |
3707 | return 1; |
3708 | |
3709 | if (STbuffer->buffer_size <= PAGE_SIZE) |
3710 | normalize_buffer(STbuffer); /* Avoid extra segment */ |
3711 | |
3712 | max_segs = STbuffer->use_sg; |
3713 | nbr = max_segs - STbuffer->frp_segs; |
3714 | if (nbr <= 0) |
3715 | return 0; |
3716 | |
3717 | priority = GFP_KERNEL | __GFP_NOWARN; |
3718 | if (need_dma) |
3719 | priority |= GFP_DMA; |
3720 | |
3721 | if (STbuffer->cleared) |
3722 | priority |= __GFP_ZERO; |
3723 | |
3724 | if (STbuffer->frp_segs) { |
3725 | order = STbuffer->reserved_page_order; |
3726 | b_size = PAGE_SIZE << order; |
3727 | } else { |
3728 | for (b_size = PAGE_SIZE, order = 0; |
3729 | order < ST_MAX_ORDER && b_size < new_size; |
3730 | order++, b_size *= 2) |
3731 | ; /* empty */ |
3732 | } |
3733 | if (max_segs * (PAGE_SIZE << order) < new_size) { |
3734 | if (order == ST_MAX_ORDER) |
3735 | return 0; |
3736 | normalize_buffer(STbuffer); |
3737 | return enlarge_buffer(STbuffer, new_size, need_dma); |
3738 | } |
3739 | |
3740 | for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; |
3741 | segs < max_segs && got < new_size;) { |
3742 | struct page *page; |
3743 | |
3744 | page = alloc_pages(priority, order); |
3745 | if (!page) { |
3746 | DEB(STbuffer->buffer_size = got); |
3747 | normalize_buffer(STbuffer); |
3748 | return 0; |
3749 | } |
3750 | |
3751 | STbuffer->frp_segs += 1; |
3752 | got += b_size; |
3753 | STbuffer->buffer_size = got; |
3754 | STbuffer->reserved_pages[segs] = page; |
3755 | segs++; |
3756 | } |
3757 | STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); |
3758 | STbuffer->reserved_page_order = order; |
3759 | |
3760 | return 1; |
3761 | } |
3762 | |
3763 | |
3764 | /* Make sure that no data from previous user is in the internal buffer */ |
3765 | static void clear_buffer(struct st_buffer * st_bp) |
3766 | { |
3767 | int i; |
3768 | |
3769 | for (i=0; i < st_bp->frp_segs; i++) |
3770 | memset(page_address(st_bp->reserved_pages[i]), 0, |
3771 | PAGE_SIZE << st_bp->reserved_page_order); |
3772 | st_bp->cleared = 1; |
3773 | } |
3774 | |
3775 | |
3776 | /* Release the extra buffer */ |
3777 | static void normalize_buffer(struct st_buffer * STbuffer) |
3778 | { |
3779 | int i, order = STbuffer->reserved_page_order; |
3780 | |
3781 | for (i = 0; i < STbuffer->frp_segs; i++) { |
3782 | __free_pages(STbuffer->reserved_pages[i], order); |
3783 | STbuffer->buffer_size -= (PAGE_SIZE << order); |
3784 | } |
3785 | STbuffer->frp_segs = 0; |
3786 | STbuffer->sg_segs = 0; |
3787 | STbuffer->reserved_page_order = 0; |
3788 | STbuffer->map_data.offset = 0; |
3789 | } |
3790 | |
3791 | |
3792 | /* Move data from the user buffer to the tape buffer. Returns zero (success) or |
3793 | negative error code. */ |
3794 | static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) |
3795 | { |
3796 | int i, cnt, res, offset; |
3797 | int length = PAGE_SIZE << st_bp->reserved_page_order; |
3798 | |
3799 | for (i = 0, offset = st_bp->buffer_bytes; |
3800 | i < st_bp->frp_segs && offset >= length; i++) |
3801 | offset -= length; |
3802 | if (i == st_bp->frp_segs) { /* Should never happen */ |
3803 | printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); |
3804 | return (-EIO); |
3805 | } |
3806 | for (; i < st_bp->frp_segs && do_count > 0; i++) { |
3807 | struct page *page = st_bp->reserved_pages[i]; |
3808 | cnt = length - offset < do_count ? length - offset : do_count; |
3809 | res = copy_from_user(page_address(page) + offset, ubp, cnt); |
3810 | if (res) |
3811 | return (-EFAULT); |
3812 | do_count -= cnt; |
3813 | st_bp->buffer_bytes += cnt; |
3814 | ubp += cnt; |
3815 | offset = 0; |
3816 | } |
3817 | if (do_count) /* Should never happen */ |
3818 | return (-EIO); |
3819 | |
3820 | return 0; |
3821 | } |
3822 | |
3823 | |
3824 | /* Move data from the tape buffer to the user buffer. Returns zero (success) or |
3825 | negative error code. */ |
3826 | static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) |
3827 | { |
3828 | int i, cnt, res, offset; |
3829 | int length = PAGE_SIZE << st_bp->reserved_page_order; |
3830 | |
3831 | for (i = 0, offset = st_bp->read_pointer; |
3832 | i < st_bp->frp_segs && offset >= length; i++) |
3833 | offset -= length; |
3834 | if (i == st_bp->frp_segs) { /* Should never happen */ |
3835 | printk(KERN_WARNING "st: from_buffer offset overflow.\n"); |
3836 | return (-EIO); |
3837 | } |
3838 | for (; i < st_bp->frp_segs && do_count > 0; i++) { |
3839 | struct page *page = st_bp->reserved_pages[i]; |
3840 | cnt = length - offset < do_count ? length - offset : do_count; |
3841 | res = copy_to_user(ubp, page_address(page) + offset, cnt); |
3842 | if (res) |
3843 | return (-EFAULT); |
3844 | do_count -= cnt; |
3845 | st_bp->buffer_bytes -= cnt; |
3846 | st_bp->read_pointer += cnt; |
3847 | ubp += cnt; |
3848 | offset = 0; |
3849 | } |
3850 | if (do_count) /* Should never happen */ |
3851 | return (-EIO); |
3852 | |
3853 | return 0; |
3854 | } |
3855 | |
3856 | |
3857 | /* Move data towards start of buffer */ |
3858 | static void move_buffer_data(struct st_buffer * st_bp, int offset) |
3859 | { |
3860 | int src_seg, dst_seg, src_offset = 0, dst_offset; |
3861 | int count, total; |
3862 | int length = PAGE_SIZE << st_bp->reserved_page_order; |
3863 | |
3864 | if (offset == 0) |
3865 | return; |
3866 | |
3867 | total=st_bp->buffer_bytes - offset; |
3868 | for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { |
3869 | src_offset = offset; |
3870 | if (src_offset < length) |
3871 | break; |
3872 | offset -= length; |
3873 | } |
3874 | |
3875 | st_bp->buffer_bytes = st_bp->read_pointer = total; |
3876 | for (dst_seg=dst_offset=0; total > 0; ) { |
3877 | struct page *dpage = st_bp->reserved_pages[dst_seg]; |
3878 | struct page *spage = st_bp->reserved_pages[src_seg]; |
3879 | |
3880 | count = min(length - dst_offset, length - src_offset); |
3881 | memmove(page_address(dpage) + dst_offset, |
3882 | page_address(spage) + src_offset, count); |
3883 | src_offset += count; |
3884 | if (src_offset >= length) { |
3885 | src_seg++; |
3886 | src_offset = 0; |
3887 | } |
3888 | dst_offset += count; |
3889 | if (dst_offset >= length) { |
3890 | dst_seg++; |
3891 | dst_offset = 0; |
3892 | } |
3893 | total -= count; |
3894 | } |
3895 | } |
3896 | |
3897 | /* Validate the options from command line or module parameters */ |
3898 | static void validate_options(void) |
3899 | { |
3900 | if (buffer_kbs > 0) |
3901 | st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; |
3902 | if (max_sg_segs >= ST_FIRST_SG) |
3903 | st_max_sg_segs = max_sg_segs; |
3904 | } |
3905 | |
3906 | #ifndef MODULE |
3907 | /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. |
3908 | */ |
3909 | static int __init st_setup(char *str) |
3910 | { |
3911 | int i, len, ints[5]; |
3912 | char *stp; |
3913 | |
3914 | stp = get_options(str, ARRAY_SIZE(ints), ints); |
3915 | |
3916 | if (ints[0] > 0) { |
3917 | for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) |
3918 | if (parms[i].val) |
3919 | *parms[i].val = ints[i + 1]; |
3920 | } else { |
3921 | while (stp != NULL) { |
3922 | for (i = 0; i < ARRAY_SIZE(parms); i++) { |
3923 | len = strlen(parms[i].name); |
3924 | if (!strncmp(stp, parms[i].name, len) && |
3925 | (*(stp + len) == ':' || *(stp + len) == '=')) { |
3926 | if (parms[i].val) |
3927 | *parms[i].val = |
3928 | simple_strtoul(stp + len + 1, NULL, 0); |
3929 | else |
3930 | printk(KERN_WARNING "st: Obsolete parameter %s\n", |
3931 | parms[i].name); |
3932 | break; |
3933 | } |
3934 | } |
3935 | if (i >= ARRAY_SIZE(parms)) |
3936 | printk(KERN_WARNING "st: invalid parameter in '%s'\n", |
3937 | stp); |
3938 | stp = strchr(stp, ','); |
3939 | if (stp) |
3940 | stp++; |
3941 | } |
3942 | } |
3943 | |
3944 | validate_options(); |
3945 | |
3946 | return 1; |
3947 | } |
3948 | |
3949 | __setup("st=", st_setup); |
3950 | |
3951 | #endif |
3952 | |
3953 | static const struct file_operations st_fops = |
3954 | { |
3955 | .owner = THIS_MODULE, |
3956 | .read = st_read, |
3957 | .write = st_write, |
3958 | .unlocked_ioctl = st_ioctl, |
3959 | #ifdef CONFIG_COMPAT |
3960 | .compat_ioctl = st_compat_ioctl, |
3961 | #endif |
3962 | .open = st_open, |
3963 | .flush = st_flush, |
3964 | .release = st_release, |
3965 | }; |
3966 | |
3967 | static int st_probe(struct device *dev) |
3968 | { |
3969 | struct scsi_device *SDp = to_scsi_device(dev); |
3970 | struct gendisk *disk = NULL; |
3971 | struct cdev *cdev = NULL; |
3972 | struct scsi_tape *tpnt = NULL; |
3973 | struct st_modedef *STm; |
3974 | struct st_partstat *STps; |
3975 | struct st_buffer *buffer; |
3976 | int i, j, mode, dev_num, error; |
3977 | char *stp; |
3978 | |
3979 | if (SDp->type != TYPE_TAPE) |
3980 | return -ENODEV; |
3981 | if ((stp = st_incompatible(SDp))) { |
3982 | sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n"); |
3983 | printk(KERN_INFO "st: The suggested driver is %s.\n", stp); |
3984 | return -ENODEV; |
3985 | } |
3986 | |
3987 | i = queue_max_segments(SDp->request_queue); |
3988 | if (st_max_sg_segs < i) |
3989 | i = st_max_sg_segs; |
3990 | buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i); |
3991 | if (buffer == NULL) { |
3992 | printk(KERN_ERR |
3993 | "st: Can't allocate new tape buffer. Device not attached.\n"); |
3994 | goto out; |
3995 | } |
3996 | |
3997 | disk = alloc_disk(1); |
3998 | if (!disk) { |
3999 | printk(KERN_ERR "st: out of memory. Device not attached.\n"); |
4000 | goto out_buffer_free; |
4001 | } |
4002 | |
4003 | write_lock(&st_dev_arr_lock); |
4004 | if (st_nr_dev >= st_dev_max) { |
4005 | struct scsi_tape **tmp_da; |
4006 | int tmp_dev_max; |
4007 | |
4008 | tmp_dev_max = max(st_nr_dev * 2, 8); |
4009 | if (tmp_dev_max > ST_MAX_TAPES) |
4010 | tmp_dev_max = ST_MAX_TAPES; |
4011 | if (tmp_dev_max <= st_nr_dev) { |
4012 | write_unlock(&st_dev_arr_lock); |
4013 | printk(KERN_ERR "st: Too many tape devices (max. %d).\n", |
4014 | ST_MAX_TAPES); |
4015 | goto out_put_disk; |
4016 | } |
4017 | |
4018 | tmp_da = kzalloc(tmp_dev_max * sizeof(struct scsi_tape *), GFP_ATOMIC); |
4019 | if (tmp_da == NULL) { |
4020 | write_unlock(&st_dev_arr_lock); |
4021 | printk(KERN_ERR "st: Can't extend device array.\n"); |
4022 | goto out_put_disk; |
4023 | } |
4024 | |
4025 | if (scsi_tapes != NULL) { |
4026 | memcpy(tmp_da, scsi_tapes, |
4027 | st_dev_max * sizeof(struct scsi_tape *)); |
4028 | kfree(scsi_tapes); |
4029 | } |
4030 | scsi_tapes = tmp_da; |
4031 | |
4032 | st_dev_max = tmp_dev_max; |
4033 | } |
4034 | |
4035 | for (i = 0; i < st_dev_max; i++) |
4036 | if (scsi_tapes[i] == NULL) |
4037 | break; |
4038 | if (i >= st_dev_max) |
4039 | panic("scsi_devices corrupt (st)"); |
4040 | |
4041 | tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC); |
4042 | if (tpnt == NULL) { |
4043 | write_unlock(&st_dev_arr_lock); |
4044 | printk(KERN_ERR "st: Can't allocate device descriptor.\n"); |
4045 | goto out_put_disk; |
4046 | } |
4047 | kref_init(&tpnt->kref); |
4048 | tpnt->disk = disk; |
4049 | sprintf(disk->disk_name, "st%d", i); |
4050 | disk->private_data = &tpnt->driver; |
4051 | disk->queue = SDp->request_queue; |
4052 | tpnt->driver = &st_template; |
4053 | scsi_tapes[i] = tpnt; |
4054 | dev_num = i; |
4055 | |
4056 | tpnt->device = SDp; |
4057 | if (SDp->scsi_level <= 2) |
4058 | tpnt->tape_type = MT_ISSCSI1; |
4059 | else |
4060 | tpnt->tape_type = MT_ISSCSI2; |
4061 | |
4062 | tpnt->buffer = buffer; |
4063 | tpnt->buffer->last_SRpnt = NULL; |
4064 | |
4065 | tpnt->inited = 0; |
4066 | tpnt->dirty = 0; |
4067 | tpnt->in_use = 0; |
4068 | tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ |
4069 | tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; |
4070 | tpnt->use_pf = (SDp->scsi_level >= SCSI_2); |
4071 | tpnt->density = 0; |
4072 | tpnt->do_auto_lock = ST_AUTO_LOCK; |
4073 | tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ |
4074 | tpnt->can_partitions = 0; |
4075 | tpnt->two_fm = ST_TWO_FM; |
4076 | tpnt->fast_mteom = ST_FAST_MTEOM; |
4077 | tpnt->scsi2_logical = ST_SCSI2LOGICAL; |
4078 | tpnt->sili = ST_SILI; |
4079 | tpnt->immediate = ST_NOWAIT; |
4080 | tpnt->default_drvbuffer = 0xff; /* No forced buffering */ |
4081 | tpnt->partition = 0; |
4082 | tpnt->new_partition = 0; |
4083 | tpnt->nbr_partitions = 0; |
4084 | blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT); |
4085 | tpnt->long_timeout = ST_LONG_TIMEOUT; |
4086 | tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; |
4087 | |
4088 | for (i = 0; i < ST_NBR_MODES; i++) { |
4089 | STm = &(tpnt->modes[i]); |
4090 | STm->defined = 0; |
4091 | STm->sysv = ST_SYSV; |
4092 | STm->defaults_for_writes = 0; |
4093 | STm->do_async_writes = ST_ASYNC_WRITES; |
4094 | STm->do_buffer_writes = ST_BUFFER_WRITES; |
4095 | STm->do_read_ahead = ST_READ_AHEAD; |
4096 | STm->default_compression = ST_DONT_TOUCH; |
4097 | STm->default_blksize = (-1); /* No forced size */ |
4098 | STm->default_density = (-1); /* No forced density */ |
4099 | } |
4100 | |
4101 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { |
4102 | STps = &(tpnt->ps[i]); |
4103 | STps->rw = ST_IDLE; |
4104 | STps->eof = ST_NOEOF; |
4105 | STps->at_sm = 0; |
4106 | STps->last_block_valid = 0; |
4107 | STps->drv_block = (-1); |
4108 | STps->drv_file = (-1); |
4109 | } |
4110 | |
4111 | tpnt->current_mode = 0; |
4112 | tpnt->modes[0].defined = 1; |
4113 | |
4114 | tpnt->density_changed = tpnt->compression_changed = |
4115 | tpnt->blksize_changed = 0; |
4116 | mutex_init(&tpnt->lock); |
4117 | |
4118 | st_nr_dev++; |
4119 | write_unlock(&st_dev_arr_lock); |
4120 | |
4121 | for (mode = 0; mode < ST_NBR_MODES; ++mode) { |
4122 | STm = &(tpnt->modes[mode]); |
4123 | for (j=0; j < 2; j++) { |
4124 | cdev = cdev_alloc(); |
4125 | if (!cdev) { |
4126 | printk(KERN_ERR |
4127 | "st%d: out of memory. Device not attached.\n", |
4128 | dev_num); |
4129 | goto out_free_tape; |
4130 | } |
4131 | cdev->owner = THIS_MODULE; |
4132 | cdev->ops = &st_fops; |
4133 | |
4134 | error = cdev_add(cdev, |
4135 | MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, j)), |
4136 | 1); |
4137 | if (error) { |
4138 | printk(KERN_ERR "st%d: Can't add %s-rewind mode %d\n", |
4139 | dev_num, j ? "non" : "auto", mode); |
4140 | printk(KERN_ERR "st%d: Device not attached.\n", dev_num); |
4141 | goto out_free_tape; |
4142 | } |
4143 | STm->cdevs[j] = cdev; |
4144 | |
4145 | } |
4146 | error = do_create_class_files(tpnt, dev_num, mode); |
4147 | if (error) |
4148 | goto out_free_tape; |
4149 | } |
4150 | |
4151 | sdev_printk(KERN_NOTICE, SDp, |
4152 | "Attached scsi tape %s\n", tape_name(tpnt)); |
4153 | sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n", |
4154 | tape_name(tpnt), tpnt->try_dio ? "yes" : "no", |
4155 | queue_dma_alignment(SDp->request_queue) + 1); |
4156 | |
4157 | return 0; |
4158 | |
4159 | out_free_tape: |
4160 | for (mode=0; mode < ST_NBR_MODES; mode++) { |
4161 | STm = &(tpnt->modes[mode]); |
4162 | sysfs_remove_link(&tpnt->device->sdev_gendev.kobj, |
4163 | "tape"); |
4164 | for (j=0; j < 2; j++) { |
4165 | if (STm->cdevs[j]) { |
4166 | if (cdev == STm->cdevs[j]) |
4167 | cdev = NULL; |
4168 | device_destroy(st_sysfs_class, |
4169 | MKDEV(SCSI_TAPE_MAJOR, |
4170 | TAPE_MINOR(i, mode, j))); |
4171 | cdev_del(STm->cdevs[j]); |
4172 | } |
4173 | } |
4174 | } |
4175 | if (cdev) |
4176 | cdev_del(cdev); |
4177 | write_lock(&st_dev_arr_lock); |
4178 | scsi_tapes[dev_num] = NULL; |
4179 | st_nr_dev--; |
4180 | write_unlock(&st_dev_arr_lock); |
4181 | out_put_disk: |
4182 | put_disk(disk); |
4183 | kfree(tpnt); |
4184 | out_buffer_free: |
4185 | kfree(buffer); |
4186 | out: |
4187 | return -ENODEV; |
4188 | }; |
4189 | |
4190 | |
4191 | static int st_remove(struct device *dev) |
4192 | { |
4193 | struct scsi_device *SDp = to_scsi_device(dev); |
4194 | struct scsi_tape *tpnt; |
4195 | int i, j, mode; |
4196 | |
4197 | write_lock(&st_dev_arr_lock); |
4198 | for (i = 0; i < st_dev_max; i++) { |
4199 | tpnt = scsi_tapes[i]; |
4200 | if (tpnt != NULL && tpnt->device == SDp) { |
4201 | scsi_tapes[i] = NULL; |
4202 | st_nr_dev--; |
4203 | write_unlock(&st_dev_arr_lock); |
4204 | sysfs_remove_link(&tpnt->device->sdev_gendev.kobj, |
4205 | "tape"); |
4206 | for (mode = 0; mode < ST_NBR_MODES; ++mode) { |
4207 | for (j=0; j < 2; j++) { |
4208 | device_destroy(st_sysfs_class, |
4209 | MKDEV(SCSI_TAPE_MAJOR, |
4210 | TAPE_MINOR(i, mode, j))); |
4211 | cdev_del(tpnt->modes[mode].cdevs[j]); |
4212 | tpnt->modes[mode].cdevs[j] = NULL; |
4213 | } |
4214 | } |
4215 | |
4216 | mutex_lock(&st_ref_mutex); |
4217 | kref_put(&tpnt->kref, scsi_tape_release); |
4218 | mutex_unlock(&st_ref_mutex); |
4219 | return 0; |
4220 | } |
4221 | } |
4222 | |
4223 | write_unlock(&st_dev_arr_lock); |
4224 | return 0; |
4225 | } |
4226 | |
4227 | /** |
4228 | * scsi_tape_release - Called to free the Scsi_Tape structure |
4229 | * @kref: pointer to embedded kref |
4230 | * |
4231 | * st_ref_mutex must be held entering this routine. Because it is |
4232 | * called on last put, you should always use the scsi_tape_get() |
4233 | * scsi_tape_put() helpers which manipulate the semaphore directly |
4234 | * and never do a direct kref_put(). |
4235 | **/ |
4236 | static void scsi_tape_release(struct kref *kref) |
4237 | { |
4238 | struct scsi_tape *tpnt = to_scsi_tape(kref); |
4239 | struct gendisk *disk = tpnt->disk; |
4240 | |
4241 | tpnt->device = NULL; |
4242 | |
4243 | if (tpnt->buffer) { |
4244 | normalize_buffer(tpnt->buffer); |
4245 | kfree(tpnt->buffer->reserved_pages); |
4246 | kfree(tpnt->buffer); |
4247 | } |
4248 | |
4249 | disk->private_data = NULL; |
4250 | put_disk(disk); |
4251 | kfree(tpnt); |
4252 | return; |
4253 | } |
4254 | |
4255 | static int __init init_st(void) |
4256 | { |
4257 | int err; |
4258 | |
4259 | validate_options(); |
4260 | |
4261 | printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n", |
4262 | verstr, st_fixed_buffer_size, st_max_sg_segs); |
4263 | |
4264 | st_sysfs_class = class_create(THIS_MODULE, "scsi_tape"); |
4265 | if (IS_ERR(st_sysfs_class)) { |
4266 | printk(KERN_ERR "Unable create sysfs class for SCSI tapes\n"); |
4267 | return PTR_ERR(st_sysfs_class); |
4268 | } |
4269 | |
4270 | err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), |
4271 | ST_MAX_TAPE_ENTRIES, "st"); |
4272 | if (err) { |
4273 | printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", |
4274 | SCSI_TAPE_MAJOR); |
4275 | goto err_class; |
4276 | } |
4277 | |
4278 | err = scsi_register_driver(&st_template.gendrv); |
4279 | if (err) |
4280 | goto err_chrdev; |
4281 | |
4282 | err = do_create_sysfs_files(); |
4283 | if (err) |
4284 | goto err_scsidrv; |
4285 | |
4286 | return 0; |
4287 | |
4288 | err_scsidrv: |
4289 | scsi_unregister_driver(&st_template.gendrv); |
4290 | err_chrdev: |
4291 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), |
4292 | ST_MAX_TAPE_ENTRIES); |
4293 | err_class: |
4294 | class_destroy(st_sysfs_class); |
4295 | return err; |
4296 | } |
4297 | |
4298 | static void __exit exit_st(void) |
4299 | { |
4300 | do_remove_sysfs_files(); |
4301 | scsi_unregister_driver(&st_template.gendrv); |
4302 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), |
4303 | ST_MAX_TAPE_ENTRIES); |
4304 | class_destroy(st_sysfs_class); |
4305 | kfree(scsi_tapes); |
4306 | printk(KERN_INFO "st: Unloaded.\n"); |
4307 | } |
4308 | |
4309 | module_init(init_st); |
4310 | module_exit(exit_st); |
4311 | |
4312 | |
4313 | /* The sysfs driver interface. Read-only at the moment */ |
4314 | static ssize_t st_try_direct_io_show(struct device_driver *ddp, char *buf) |
4315 | { |
4316 | return snprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); |
4317 | } |
4318 | static DRIVER_ATTR(try_direct_io, S_IRUGO, st_try_direct_io_show, NULL); |
4319 | |
4320 | static ssize_t st_fixed_buffer_size_show(struct device_driver *ddp, char *buf) |
4321 | { |
4322 | return snprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); |
4323 | } |
4324 | static DRIVER_ATTR(fixed_buffer_size, S_IRUGO, st_fixed_buffer_size_show, NULL); |
4325 | |
4326 | static ssize_t st_max_sg_segs_show(struct device_driver *ddp, char *buf) |
4327 | { |
4328 | return snprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); |
4329 | } |
4330 | static DRIVER_ATTR(max_sg_segs, S_IRUGO, st_max_sg_segs_show, NULL); |
4331 | |
4332 | static ssize_t st_version_show(struct device_driver *ddd, char *buf) |
4333 | { |
4334 | return snprintf(buf, PAGE_SIZE, "[%s]\n", verstr); |
4335 | } |
4336 | static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL); |
4337 | |
4338 | static int do_create_sysfs_files(void) |
4339 | { |
4340 | struct device_driver *sysfs = &st_template.gendrv; |
4341 | int err; |
4342 | |
4343 | err = driver_create_file(sysfs, &driver_attr_try_direct_io); |
4344 | if (err) |
4345 | return err; |
4346 | err = driver_create_file(sysfs, &driver_attr_fixed_buffer_size); |
4347 | if (err) |
4348 | goto err_try_direct_io; |
4349 | err = driver_create_file(sysfs, &driver_attr_max_sg_segs); |
4350 | if (err) |
4351 | goto err_attr_fixed_buf; |
4352 | err = driver_create_file(sysfs, &driver_attr_version); |
4353 | if (err) |
4354 | goto err_attr_max_sg; |
4355 | |
4356 | return 0; |
4357 | |
4358 | err_attr_max_sg: |
4359 | driver_remove_file(sysfs, &driver_attr_max_sg_segs); |
4360 | err_attr_fixed_buf: |
4361 | driver_remove_file(sysfs, &driver_attr_fixed_buffer_size); |
4362 | err_try_direct_io: |
4363 | driver_remove_file(sysfs, &driver_attr_try_direct_io); |
4364 | return err; |
4365 | } |
4366 | |
4367 | static void do_remove_sysfs_files(void) |
4368 | { |
4369 | struct device_driver *sysfs = &st_template.gendrv; |
4370 | |
4371 | driver_remove_file(sysfs, &driver_attr_version); |
4372 | driver_remove_file(sysfs, &driver_attr_max_sg_segs); |
4373 | driver_remove_file(sysfs, &driver_attr_fixed_buffer_size); |
4374 | driver_remove_file(sysfs, &driver_attr_try_direct_io); |
4375 | } |
4376 | |
4377 | |
4378 | /* The sysfs simple class interface */ |
4379 | static ssize_t |
4380 | st_defined_show(struct device *dev, struct device_attribute *attr, char *buf) |
4381 | { |
4382 | struct st_modedef *STm = dev_get_drvdata(dev); |
4383 | ssize_t l = 0; |
4384 | |
4385 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); |
4386 | return l; |
4387 | } |
4388 | |
4389 | DEVICE_ATTR(defined, S_IRUGO, st_defined_show, NULL); |
4390 | |
4391 | static ssize_t |
4392 | st_defblk_show(struct device *dev, struct device_attribute *attr, char *buf) |
4393 | { |
4394 | struct st_modedef *STm = dev_get_drvdata(dev); |
4395 | ssize_t l = 0; |
4396 | |
4397 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); |
4398 | return l; |
4399 | } |
4400 | |
4401 | DEVICE_ATTR(default_blksize, S_IRUGO, st_defblk_show, NULL); |
4402 | |
4403 | static ssize_t |
4404 | st_defdensity_show(struct device *dev, struct device_attribute *attr, char *buf) |
4405 | { |
4406 | struct st_modedef *STm = dev_get_drvdata(dev); |
4407 | ssize_t l = 0; |
4408 | char *fmt; |
4409 | |
4410 | fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; |
4411 | l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); |
4412 | return l; |
4413 | } |
4414 | |
4415 | DEVICE_ATTR(default_density, S_IRUGO, st_defdensity_show, NULL); |
4416 | |
4417 | static ssize_t |
4418 | st_defcompression_show(struct device *dev, struct device_attribute *attr, |
4419 | char *buf) |
4420 | { |
4421 | struct st_modedef *STm = dev_get_drvdata(dev); |
4422 | ssize_t l = 0; |
4423 | |
4424 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); |
4425 | return l; |
4426 | } |
4427 | |
4428 | DEVICE_ATTR(default_compression, S_IRUGO, st_defcompression_show, NULL); |
4429 | |
4430 | static ssize_t |
4431 | st_options_show(struct device *dev, struct device_attribute *attr, char *buf) |
4432 | { |
4433 | struct st_modedef *STm = dev_get_drvdata(dev); |
4434 | struct scsi_tape *STp; |
4435 | int i, j, options; |
4436 | ssize_t l = 0; |
4437 | |
4438 | for (i=0; i < st_dev_max; i++) { |
4439 | for (j=0; j < ST_NBR_MODES; j++) |
4440 | if (&scsi_tapes[i]->modes[j] == STm) |
4441 | break; |
4442 | if (j < ST_NBR_MODES) |
4443 | break; |
4444 | } |
4445 | if (i == st_dev_max) |
4446 | return 0; /* should never happen */ |
4447 | |
4448 | STp = scsi_tapes[i]; |
4449 | |
4450 | options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; |
4451 | options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; |
4452 | options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; |
4453 | DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); |
4454 | options |= STp->two_fm ? MT_ST_TWO_FM : 0; |
4455 | options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; |
4456 | options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; |
4457 | options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; |
4458 | options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; |
4459 | options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; |
4460 | options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; |
4461 | options |= STm->sysv ? MT_ST_SYSV : 0; |
4462 | options |= STp->immediate ? MT_ST_NOWAIT : 0; |
4463 | options |= STp->sili ? MT_ST_SILI : 0; |
4464 | |
4465 | l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); |
4466 | return l; |
4467 | } |
4468 | |
4469 | DEVICE_ATTR(options, S_IRUGO, st_options_show, NULL); |
4470 | |
4471 | static int do_create_class_files(struct scsi_tape *STp, int dev_num, int mode) |
4472 | { |
4473 | int i, rew, error; |
4474 | char name[10]; |
4475 | struct device *st_class_member; |
4476 | |
4477 | for (rew=0; rew < 2; rew++) { |
4478 | /* Make sure that the minor numbers corresponding to the four |
4479 | first modes always get the same names */ |
4480 | i = mode << (4 - ST_NBR_MODE_BITS); |
4481 | snprintf(name, 10, "%s%s%s", rew ? "n" : "", |
4482 | STp->disk->disk_name, st_formats[i]); |
4483 | st_class_member = |
4484 | device_create(st_sysfs_class, &STp->device->sdev_gendev, |
4485 | MKDEV(SCSI_TAPE_MAJOR, |
4486 | TAPE_MINOR(dev_num, mode, rew)), |
4487 | &STp->modes[mode], "%s", name); |
4488 | if (IS_ERR(st_class_member)) { |
4489 | printk(KERN_WARNING "st%d: device_create failed\n", |
4490 | dev_num); |
4491 | error = PTR_ERR(st_class_member); |
4492 | goto out; |
4493 | } |
4494 | |
4495 | error = device_create_file(st_class_member, |
4496 | &dev_attr_defined); |
4497 | if (error) goto out; |
4498 | error = device_create_file(st_class_member, |
4499 | &dev_attr_default_blksize); |
4500 | if (error) goto out; |
4501 | error = device_create_file(st_class_member, |
4502 | &dev_attr_default_density); |
4503 | if (error) goto out; |
4504 | error = device_create_file(st_class_member, |
4505 | &dev_attr_default_compression); |
4506 | if (error) goto out; |
4507 | error = device_create_file(st_class_member, |
4508 | &dev_attr_options); |
4509 | if (error) goto out; |
4510 | |
4511 | if (mode == 0 && rew == 0) { |
4512 | error = sysfs_create_link(&STp->device->sdev_gendev.kobj, |
4513 | &st_class_member->kobj, |
4514 | "tape"); |
4515 | if (error) { |
4516 | printk(KERN_ERR |
4517 | "st%d: Can't create sysfs link from SCSI device.\n", |
4518 | dev_num); |
4519 | goto out; |
4520 | } |
4521 | } |
4522 | } |
4523 | |
4524 | return 0; |
4525 | |
4526 | out: |
4527 | return error; |
4528 | } |
4529 | |
4530 | /* The following functions may be useful for a larger audience. */ |
4531 | static int sgl_map_user_pages(struct st_buffer *STbp, |
4532 | const unsigned int max_pages, unsigned long uaddr, |
4533 | size_t count, int rw) |
4534 | { |
4535 | unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; |
4536 | unsigned long start = uaddr >> PAGE_SHIFT; |
4537 | const int nr_pages = end - start; |
4538 | int res, i, j; |
4539 | struct page **pages; |
4540 | struct rq_map_data *mdata = &STbp->map_data; |
4541 | |
4542 | /* User attempted Overflow! */ |
4543 | if ((uaddr + count) < uaddr) |
4544 | return -EINVAL; |
4545 | |
4546 | /* Too big */ |
4547 | if (nr_pages > max_pages) |
4548 | return -ENOMEM; |
4549 | |
4550 | /* Hmm? */ |
4551 | if (count == 0) |
4552 | return 0; |
4553 | |
4554 | if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL) |
4555 | return -ENOMEM; |
4556 | |
4557 | /* Try to fault in all of the necessary pages */ |
4558 | down_read(¤t->mm->mmap_sem); |
4559 | /* rw==READ means read from drive, write into memory area */ |
4560 | res = get_user_pages( |
4561 | current, |
4562 | current->mm, |
4563 | uaddr, |
4564 | nr_pages, |
4565 | rw == READ, |
4566 | 0, /* don't force */ |
4567 | pages, |
4568 | NULL); |
4569 | up_read(¤t->mm->mmap_sem); |
4570 | |
4571 | /* Errors and no page mapped should return here */ |
4572 | if (res < nr_pages) |
4573 | goto out_unmap; |
4574 | |
4575 | for (i=0; i < nr_pages; i++) { |
4576 | /* FIXME: flush superflous for rw==READ, |
4577 | * probably wrong function for rw==WRITE |
4578 | */ |
4579 | flush_dcache_page(pages[i]); |
4580 | } |
4581 | |
4582 | mdata->offset = uaddr & ~PAGE_MASK; |
4583 | STbp->mapped_pages = pages; |
4584 | |
4585 | return nr_pages; |
4586 | out_unmap: |
4587 | if (res > 0) { |
4588 | for (j=0; j < res; j++) |
4589 | page_cache_release(pages[j]); |
4590 | res = 0; |
4591 | } |
4592 | kfree(pages); |
4593 | return res; |
4594 | } |
4595 | |
4596 | |
4597 | /* And unmap them... */ |
4598 | static int sgl_unmap_user_pages(struct st_buffer *STbp, |
4599 | const unsigned int nr_pages, int dirtied) |
4600 | { |
4601 | int i; |
4602 | |
4603 | for (i=0; i < nr_pages; i++) { |
4604 | struct page *page = STbp->mapped_pages[i]; |
4605 | |
4606 | if (dirtied) |
4607 | SetPageDirty(page); |
4608 | /* FIXME: cache flush missing for rw==READ |
4609 | * FIXME: call the correct reference counting function |
4610 | */ |
4611 | page_cache_release(page); |
4612 | } |
4613 | kfree(STbp->mapped_pages); |
4614 | STbp->mapped_pages = NULL; |
4615 | |
4616 | return 0; |
4617 | } |
4618 |
Branches:
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9