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 - 2010 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 = "20101219"; |
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/idr.h> |
41 | #include <linux/delay.h> |
42 | #include <linux/mutex.h> |
43 | |
44 | #include <asm/uaccess.h> |
45 | #include <asm/dma.h> |
46 | |
47 | #include <scsi/scsi.h> |
48 | #include <scsi/scsi_dbg.h> |
49 | #include <scsi/scsi_device.h> |
50 | #include <scsi/scsi_driver.h> |
51 | #include <scsi/scsi_eh.h> |
52 | #include <scsi/scsi_host.h> |
53 | #include <scsi/scsi_ioctl.h> |
54 | #include <scsi/sg.h> |
55 | |
56 | |
57 | /* The driver prints some debugging information on the console if DEBUG |
58 | is defined and non-zero. */ |
59 | #define DEBUG 0 |
60 | |
61 | #if DEBUG |
62 | /* The message level for the debug messages is currently set to KERN_NOTICE |
63 | so that people can easily see the messages. Later when the debugging messages |
64 | in the drivers are more widely classified, this may be changed to KERN_DEBUG. */ |
65 | #define ST_DEB_MSG KERN_NOTICE |
66 | #define DEB(a) a |
67 | #define DEBC(a) if (debugging) { a ; } |
68 | #else |
69 | #define DEB(a) |
70 | #define DEBC(a) |
71 | #endif |
72 | |
73 | #define ST_KILOBYTE 1024 |
74 | |
75 | #include "st_options.h" |
76 | #include "st.h" |
77 | |
78 | static int buffer_kbs; |
79 | static int max_sg_segs; |
80 | static int try_direct_io = TRY_DIRECT_IO; |
81 | static int try_rdio = 1; |
82 | static int try_wdio = 1; |
83 | |
84 | static struct class st_sysfs_class; |
85 | static struct device_attribute st_dev_attrs[]; |
86 | |
87 | MODULE_AUTHOR("Kai Makisara"); |
88 | MODULE_DESCRIPTION("SCSI tape (st) driver"); |
89 | MODULE_LICENSE("GPL"); |
90 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR); |
91 | MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE); |
92 | |
93 | /* Set 'perm' (4th argument) to 0 to disable module_param's definition |
94 | * of sysfs parameters (which module_param doesn't yet support). |
95 | * Sysfs parameters defined explicitly later. |
96 | */ |
97 | module_param_named(buffer_kbs, buffer_kbs, int, 0); |
98 | MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)"); |
99 | module_param_named(max_sg_segs, max_sg_segs, int, 0); |
100 | MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)"); |
101 | module_param_named(try_direct_io, try_direct_io, int, 0); |
102 | MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)"); |
103 | |
104 | /* Extra parameters for testing */ |
105 | module_param_named(try_rdio, try_rdio, int, 0); |
106 | MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); |
107 | module_param_named(try_wdio, try_wdio, int, 0); |
108 | MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); |
109 | |
110 | #ifndef MODULE |
111 | static int write_threshold_kbs; /* retained for compatibility */ |
112 | static struct st_dev_parm { |
113 | char *name; |
114 | int *val; |
115 | } parms[] __initdata = { |
116 | { |
117 | "buffer_kbs", &buffer_kbs |
118 | }, |
119 | { /* Retained for compatibility with 2.4 */ |
120 | "write_threshold_kbs", &write_threshold_kbs |
121 | }, |
122 | { |
123 | "max_sg_segs", NULL |
124 | }, |
125 | { |
126 | "try_direct_io", &try_direct_io |
127 | } |
128 | }; |
129 | #endif |
130 | |
131 | /* Restrict the number of modes so that names for all are assigned */ |
132 | #if ST_NBR_MODES > 16 |
133 | #error "Maximum number of modes is 16" |
134 | #endif |
135 | /* Bit reversed order to get same names for same minors with all |
136 | mode counts */ |
137 | static const char *st_formats[] = { |
138 | "", "r", "k", "s", "l", "t", "o", "u", |
139 | "m", "v", "p", "x", "a", "y", "q", "z"}; |
140 | |
141 | /* The default definitions have been moved to st_options.h */ |
142 | |
143 | #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) |
144 | |
145 | /* The buffer size should fit into the 24 bits for length in the |
146 | 6-byte SCSI read and write commands. */ |
147 | #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) |
148 | #error "Buffer size should not exceed (2 << 24 - 1) bytes!" |
149 | #endif |
150 | |
151 | static int debugging = DEBUG; |
152 | |
153 | #define MAX_RETRIES 0 |
154 | #define MAX_WRITE_RETRIES 0 |
155 | #define MAX_READY_RETRIES 0 |
156 | #define NO_TAPE NOT_READY |
157 | |
158 | #define ST_TIMEOUT (900 * HZ) |
159 | #define ST_LONG_TIMEOUT (14000 * HZ) |
160 | |
161 | /* Remove mode bits and auto-rewind bit (7) */ |
162 | #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ |
163 | (iminor(x) & ~(-1 << ST_MODE_SHIFT)) ) |
164 | #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) |
165 | |
166 | /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ |
167 | #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ |
168 | (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) |
169 | |
170 | /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower |
171 | 24 bits) */ |
172 | #define SET_DENS_AND_BLK 0x10001 |
173 | |
174 | static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; |
175 | static int st_max_sg_segs = ST_MAX_SG; |
176 | |
177 | static int modes_defined; |
178 | |
179 | static int enlarge_buffer(struct st_buffer *, int, int); |
180 | static void clear_buffer(struct st_buffer *); |
181 | static void normalize_buffer(struct st_buffer *); |
182 | static int append_to_buffer(const char __user *, struct st_buffer *, int); |
183 | static int from_buffer(struct st_buffer *, char __user *, int); |
184 | static void move_buffer_data(struct st_buffer *, int); |
185 | |
186 | static int sgl_map_user_pages(struct st_buffer *, const unsigned int, |
187 | unsigned long, size_t, int); |
188 | static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int); |
189 | |
190 | static int st_probe(struct device *); |
191 | static int st_remove(struct device *); |
192 | |
193 | static int do_create_sysfs_files(void); |
194 | static void do_remove_sysfs_files(void); |
195 | |
196 | static struct scsi_driver st_template = { |
197 | .owner = THIS_MODULE, |
198 | .gendrv = { |
199 | .name = "st", |
200 | .probe = st_probe, |
201 | .remove = st_remove, |
202 | }, |
203 | }; |
204 | |
205 | static int st_compression(struct scsi_tape *, int); |
206 | |
207 | static int find_partition(struct scsi_tape *); |
208 | static int switch_partition(struct scsi_tape *); |
209 | |
210 | static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); |
211 | |
212 | static void scsi_tape_release(struct kref *); |
213 | |
214 | #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref) |
215 | |
216 | static DEFINE_MUTEX(st_ref_mutex); |
217 | static DEFINE_SPINLOCK(st_index_lock); |
218 | static DEFINE_SPINLOCK(st_use_lock); |
219 | static DEFINE_IDR(st_index_idr); |
220 | |
221 | |
222 | |
223 | #include "osst_detect.h" |
224 | #ifndef SIGS_FROM_OSST |
225 | #define SIGS_FROM_OSST \ |
226 | {"OnStream", "SC-", "", "osst"}, \ |
227 | {"OnStream", "DI-", "", "osst"}, \ |
228 | {"OnStream", "DP-", "", "osst"}, \ |
229 | {"OnStream", "USB", "", "osst"}, \ |
230 | {"OnStream", "FW-", "", "osst"} |
231 | #endif |
232 | |
233 | static struct scsi_tape *scsi_tape_get(int dev) |
234 | { |
235 | struct scsi_tape *STp = NULL; |
236 | |
237 | mutex_lock(&st_ref_mutex); |
238 | spin_lock(&st_index_lock); |
239 | |
240 | STp = idr_find(&st_index_idr, dev); |
241 | if (!STp) goto out; |
242 | |
243 | kref_get(&STp->kref); |
244 | |
245 | if (!STp->device) |
246 | goto out_put; |
247 | |
248 | if (scsi_device_get(STp->device)) |
249 | goto out_put; |
250 | |
251 | goto out; |
252 | |
253 | out_put: |
254 | kref_put(&STp->kref, scsi_tape_release); |
255 | STp = NULL; |
256 | out: |
257 | spin_unlock(&st_index_lock); |
258 | mutex_unlock(&st_ref_mutex); |
259 | return STp; |
260 | } |
261 | |
262 | static void scsi_tape_put(struct scsi_tape *STp) |
263 | { |
264 | struct scsi_device *sdev = STp->device; |
265 | |
266 | mutex_lock(&st_ref_mutex); |
267 | kref_put(&STp->kref, scsi_tape_release); |
268 | scsi_device_put(sdev); |
269 | mutex_unlock(&st_ref_mutex); |
270 | } |
271 | |
272 | struct st_reject_data { |
273 | char *vendor; |
274 | char *model; |
275 | char *rev; |
276 | char *driver_hint; /* Name of the correct driver, NULL if unknown */ |
277 | }; |
278 | |
279 | static struct st_reject_data reject_list[] = { |
280 | /* {"XXX", "Yy-", "", NULL}, example */ |
281 | SIGS_FROM_OSST, |
282 | {NULL, }}; |
283 | |
284 | /* If the device signature is on the list of incompatible drives, the |
285 | function returns a pointer to the name of the correct driver (if known) */ |
286 | static char * st_incompatible(struct scsi_device* SDp) |
287 | { |
288 | struct st_reject_data *rp; |
289 | |
290 | for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) |
291 | if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && |
292 | !strncmp(rp->model, SDp->model, strlen(rp->model)) && |
293 | !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { |
294 | if (rp->driver_hint) |
295 | return rp->driver_hint; |
296 | else |
297 | return "unknown"; |
298 | } |
299 | return NULL; |
300 | } |
301 | |
302 | |
303 | static inline char *tape_name(struct scsi_tape *tape) |
304 | { |
305 | return tape->disk->disk_name; |
306 | } |
307 | |
308 | |
309 | static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s) |
310 | { |
311 | const u8 *ucp; |
312 | const u8 *sense = SRpnt->sense; |
313 | |
314 | s->have_sense = scsi_normalize_sense(SRpnt->sense, |
315 | SCSI_SENSE_BUFFERSIZE, &s->sense_hdr); |
316 | s->flags = 0; |
317 | |
318 | if (s->have_sense) { |
319 | s->deferred = 0; |
320 | s->remainder_valid = |
321 | scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); |
322 | switch (sense[0] & 0x7f) { |
323 | case 0x71: |
324 | s->deferred = 1; |
325 | case 0x70: |
326 | s->fixed_format = 1; |
327 | s->flags = sense[2] & 0xe0; |
328 | break; |
329 | case 0x73: |
330 | s->deferred = 1; |
331 | case 0x72: |
332 | s->fixed_format = 0; |
333 | ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); |
334 | s->flags = ucp ? (ucp[3] & 0xe0) : 0; |
335 | break; |
336 | } |
337 | } |
338 | } |
339 | |
340 | |
341 | /* Convert the result to success code */ |
342 | static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt) |
343 | { |
344 | int result = SRpnt->result; |
345 | u8 scode; |
346 | DEB(const char *stp;) |
347 | char *name = tape_name(STp); |
348 | struct st_cmdstatus *cmdstatp; |
349 | |
350 | if (!result) |
351 | return 0; |
352 | |
353 | cmdstatp = &STp->buffer->cmdstat; |
354 | st_analyze_sense(SRpnt, cmdstatp); |
355 | |
356 | if (cmdstatp->have_sense) |
357 | scode = STp->buffer->cmdstat.sense_hdr.sense_key; |
358 | else |
359 | scode = 0; |
360 | |
361 | DEB( |
362 | if (debugging) { |
363 | printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x\n", |
364 | name, result, |
365 | SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2], |
366 | SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]); |
367 | if (cmdstatp->have_sense) |
368 | __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE); |
369 | } ) /* end DEB */ |
370 | if (!debugging) { /* Abnormal conditions for tape */ |
371 | if (!cmdstatp->have_sense) |
372 | printk(KERN_WARNING |
373 | "%s: Error %x (driver bt 0x%x, host bt 0x%x).\n", |
374 | name, result, driver_byte(result), |
375 | host_byte(result)); |
376 | else if (cmdstatp->have_sense && |
377 | scode != NO_SENSE && |
378 | scode != RECOVERED_ERROR && |
379 | /* scode != UNIT_ATTENTION && */ |
380 | scode != BLANK_CHECK && |
381 | scode != VOLUME_OVERFLOW && |
382 | SRpnt->cmd[0] != MODE_SENSE && |
383 | SRpnt->cmd[0] != TEST_UNIT_READY) { |
384 | |
385 | __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE); |
386 | } |
387 | } |
388 | |
389 | if (cmdstatp->fixed_format && |
390 | STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ |
391 | if (STp->cln_sense_value) |
392 | STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & |
393 | STp->cln_sense_mask) == STp->cln_sense_value); |
394 | else |
395 | STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & |
396 | STp->cln_sense_mask) != 0); |
397 | } |
398 | if (cmdstatp->have_sense && |
399 | cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17) |
400 | STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */ |
401 | |
402 | STp->pos_unknown |= STp->device->was_reset; |
403 | |
404 | if (cmdstatp->have_sense && |
405 | scode == RECOVERED_ERROR |
406 | #if ST_RECOVERED_WRITE_FATAL |
407 | && SRpnt->cmd[0] != WRITE_6 |
408 | && SRpnt->cmd[0] != WRITE_FILEMARKS |
409 | #endif |
410 | ) { |
411 | STp->recover_count++; |
412 | STp->recover_reg++; |
413 | |
414 | DEB( |
415 | if (debugging) { |
416 | if (SRpnt->cmd[0] == READ_6) |
417 | stp = "read"; |
418 | else if (SRpnt->cmd[0] == WRITE_6) |
419 | stp = "write"; |
420 | else |
421 | stp = "ioctl"; |
422 | printk(ST_DEB_MSG "%s: Recovered %s error (%d).\n", name, stp, |
423 | STp->recover_count); |
424 | } ) /* end DEB */ |
425 | |
426 | if (cmdstatp->flags == 0) |
427 | return 0; |
428 | } |
429 | return (-EIO); |
430 | } |
431 | |
432 | static struct st_request *st_allocate_request(struct scsi_tape *stp) |
433 | { |
434 | struct st_request *streq; |
435 | |
436 | streq = kzalloc(sizeof(*streq), GFP_KERNEL); |
437 | if (streq) |
438 | streq->stp = stp; |
439 | else { |
440 | DEBC(printk(KERN_ERR "%s: Can't get SCSI request.\n", |
441 | tape_name(stp));); |
442 | if (signal_pending(current)) |
443 | stp->buffer->syscall_result = -EINTR; |
444 | else |
445 | stp->buffer->syscall_result = -EBUSY; |
446 | } |
447 | |
448 | return streq; |
449 | } |
450 | |
451 | static void st_release_request(struct st_request *streq) |
452 | { |
453 | kfree(streq); |
454 | } |
455 | |
456 | static void st_scsi_execute_end(struct request *req, int uptodate) |
457 | { |
458 | struct st_request *SRpnt = req->end_io_data; |
459 | struct scsi_tape *STp = SRpnt->stp; |
460 | struct bio *tmp; |
461 | |
462 | STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors; |
463 | STp->buffer->cmdstat.residual = req->resid_len; |
464 | |
465 | tmp = SRpnt->bio; |
466 | if (SRpnt->waiting) |
467 | complete(SRpnt->waiting); |
468 | |
469 | blk_rq_unmap_user(tmp); |
470 | __blk_put_request(req->q, req); |
471 | } |
472 | |
473 | static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, |
474 | int data_direction, void *buffer, unsigned bufflen, |
475 | int timeout, int retries) |
476 | { |
477 | struct request *req; |
478 | struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data; |
479 | int err = 0; |
480 | int write = (data_direction == DMA_TO_DEVICE); |
481 | |
482 | req = blk_get_request(SRpnt->stp->device->request_queue, write, |
483 | GFP_KERNEL); |
484 | if (!req) |
485 | return DRIVER_ERROR << 24; |
486 | |
487 | req->cmd_type = REQ_TYPE_BLOCK_PC; |
488 | req->cmd_flags |= REQ_QUIET; |
489 | |
490 | mdata->null_mapped = 1; |
491 | |
492 | if (bufflen) { |
493 | err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, |
494 | GFP_KERNEL); |
495 | if (err) { |
496 | blk_put_request(req); |
497 | return DRIVER_ERROR << 24; |
498 | } |
499 | } |
500 | |
501 | SRpnt->bio = req->bio; |
502 | req->cmd_len = COMMAND_SIZE(cmd[0]); |
503 | memset(req->cmd, 0, BLK_MAX_CDB); |
504 | memcpy(req->cmd, cmd, req->cmd_len); |
505 | req->sense = SRpnt->sense; |
506 | req->sense_len = 0; |
507 | req->timeout = timeout; |
508 | req->retries = retries; |
509 | req->end_io_data = SRpnt; |
510 | |
511 | blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end); |
512 | return 0; |
513 | } |
514 | |
515 | /* Do the scsi command. Waits until command performed if do_wait is true. |
516 | Otherwise write_behind_check() is used to check that the command |
517 | has finished. */ |
518 | static struct st_request * |
519 | st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, |
520 | int bytes, int direction, int timeout, int retries, int do_wait) |
521 | { |
522 | struct completion *waiting; |
523 | struct rq_map_data *mdata = &STp->buffer->map_data; |
524 | int ret; |
525 | |
526 | /* if async, make sure there's no command outstanding */ |
527 | if (!do_wait && ((STp->buffer)->last_SRpnt)) { |
528 | printk(KERN_ERR "%s: Async command already active.\n", |
529 | tape_name(STp)); |
530 | if (signal_pending(current)) |
531 | (STp->buffer)->syscall_result = (-EINTR); |
532 | else |
533 | (STp->buffer)->syscall_result = (-EBUSY); |
534 | return NULL; |
535 | } |
536 | |
537 | if (!SRpnt) { |
538 | SRpnt = st_allocate_request(STp); |
539 | if (!SRpnt) |
540 | return NULL; |
541 | } |
542 | |
543 | /* If async IO, set last_SRpnt. This ptr tells write_behind_check |
544 | which IO is outstanding. It's nulled out when the IO completes. */ |
545 | if (!do_wait) |
546 | (STp->buffer)->last_SRpnt = SRpnt; |
547 | |
548 | waiting = &STp->wait; |
549 | init_completion(waiting); |
550 | SRpnt->waiting = waiting; |
551 | |
552 | if (STp->buffer->do_dio) { |
553 | mdata->page_order = 0; |
554 | mdata->nr_entries = STp->buffer->sg_segs; |
555 | mdata->pages = STp->buffer->mapped_pages; |
556 | } else { |
557 | mdata->page_order = STp->buffer->reserved_page_order; |
558 | mdata->nr_entries = |
559 | DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order); |
560 | mdata->pages = STp->buffer->reserved_pages; |
561 | mdata->offset = 0; |
562 | } |
563 | |
564 | memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd)); |
565 | STp->buffer->cmdstat.have_sense = 0; |
566 | STp->buffer->syscall_result = 0; |
567 | |
568 | ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout, |
569 | retries); |
570 | if (ret) { |
571 | /* could not allocate the buffer or request was too large */ |
572 | (STp->buffer)->syscall_result = (-EBUSY); |
573 | (STp->buffer)->last_SRpnt = NULL; |
574 | } else if (do_wait) { |
575 | wait_for_completion(waiting); |
576 | SRpnt->waiting = NULL; |
577 | (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); |
578 | } |
579 | |
580 | return SRpnt; |
581 | } |
582 | |
583 | |
584 | /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if |
585 | write has been correct but EOM early warning reached, -EIO if write ended in |
586 | error or zero if write successful. Asynchronous writes are used only in |
587 | variable block mode. */ |
588 | static int write_behind_check(struct scsi_tape * STp) |
589 | { |
590 | int retval = 0; |
591 | struct st_buffer *STbuffer; |
592 | struct st_partstat *STps; |
593 | struct st_cmdstatus *cmdstatp; |
594 | struct st_request *SRpnt; |
595 | |
596 | STbuffer = STp->buffer; |
597 | if (!STbuffer->writing) |
598 | return 0; |
599 | |
600 | DEB( |
601 | if (STp->write_pending) |
602 | STp->nbr_waits++; |
603 | else |
604 | STp->nbr_finished++; |
605 | ) /* end DEB */ |
606 | |
607 | wait_for_completion(&(STp->wait)); |
608 | SRpnt = STbuffer->last_SRpnt; |
609 | STbuffer->last_SRpnt = NULL; |
610 | SRpnt->waiting = NULL; |
611 | |
612 | (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); |
613 | st_release_request(SRpnt); |
614 | |
615 | STbuffer->buffer_bytes -= STbuffer->writing; |
616 | STps = &(STp->ps[STp->partition]); |
617 | if (STps->drv_block >= 0) { |
618 | if (STp->block_size == 0) |
619 | STps->drv_block++; |
620 | else |
621 | STps->drv_block += STbuffer->writing / STp->block_size; |
622 | } |
623 | |
624 | cmdstatp = &STbuffer->cmdstat; |
625 | if (STbuffer->syscall_result) { |
626 | retval = -EIO; |
627 | if (cmdstatp->have_sense && !cmdstatp->deferred && |
628 | (cmdstatp->flags & SENSE_EOM) && |
629 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || |
630 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) { |
631 | /* EOM at write-behind, has all data been written? */ |
632 | if (!cmdstatp->remainder_valid || |
633 | cmdstatp->uremainder64 == 0) |
634 | retval = -ENOSPC; |
635 | } |
636 | if (retval == -EIO) |
637 | STps->drv_block = -1; |
638 | } |
639 | STbuffer->writing = 0; |
640 | |
641 | DEB(if (debugging && retval) |
642 | printk(ST_DEB_MSG "%s: Async write error %x, return value %d.\n", |
643 | tape_name(STp), STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */ |
644 | |
645 | return retval; |
646 | } |
647 | |
648 | |
649 | /* Step over EOF if it has been inadvertently crossed (ioctl not used because |
650 | it messes up the block number). */ |
651 | static int cross_eof(struct scsi_tape * STp, int forward) |
652 | { |
653 | struct st_request *SRpnt; |
654 | unsigned char cmd[MAX_COMMAND_SIZE]; |
655 | |
656 | cmd[0] = SPACE; |
657 | cmd[1] = 0x01; /* Space FileMarks */ |
658 | if (forward) { |
659 | cmd[2] = cmd[3] = 0; |
660 | cmd[4] = 1; |
661 | } else |
662 | cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ |
663 | cmd[5] = 0; |
664 | |
665 | DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n", |
666 | tape_name(STp), forward ? "forward" : "backward")); |
667 | |
668 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
669 | STp->device->request_queue->rq_timeout, |
670 | MAX_RETRIES, 1); |
671 | if (!SRpnt) |
672 | return (STp->buffer)->syscall_result; |
673 | |
674 | st_release_request(SRpnt); |
675 | SRpnt = NULL; |
676 | |
677 | if ((STp->buffer)->cmdstat.midlevel_result != 0) |
678 | printk(KERN_ERR "%s: Stepping over filemark %s failed.\n", |
679 | tape_name(STp), forward ? "forward" : "backward"); |
680 | |
681 | return (STp->buffer)->syscall_result; |
682 | } |
683 | |
684 | |
685 | /* Flush the write buffer (never need to write if variable blocksize). */ |
686 | static int st_flush_write_buffer(struct scsi_tape * STp) |
687 | { |
688 | int transfer, blks; |
689 | int result; |
690 | unsigned char cmd[MAX_COMMAND_SIZE]; |
691 | struct st_request *SRpnt; |
692 | struct st_partstat *STps; |
693 | |
694 | result = write_behind_check(STp); |
695 | if (result) |
696 | return result; |
697 | |
698 | result = 0; |
699 | if (STp->dirty == 1) { |
700 | |
701 | transfer = STp->buffer->buffer_bytes; |
702 | DEBC(printk(ST_DEB_MSG "%s: Flushing %d bytes.\n", |
703 | tape_name(STp), transfer)); |
704 | |
705 | memset(cmd, 0, MAX_COMMAND_SIZE); |
706 | cmd[0] = WRITE_6; |
707 | cmd[1] = 1; |
708 | blks = transfer / STp->block_size; |
709 | cmd[2] = blks >> 16; |
710 | cmd[3] = blks >> 8; |
711 | cmd[4] = blks; |
712 | |
713 | SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE, |
714 | STp->device->request_queue->rq_timeout, |
715 | MAX_WRITE_RETRIES, 1); |
716 | if (!SRpnt) |
717 | return (STp->buffer)->syscall_result; |
718 | |
719 | STps = &(STp->ps[STp->partition]); |
720 | if ((STp->buffer)->syscall_result != 0) { |
721 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; |
722 | |
723 | if (cmdstatp->have_sense && !cmdstatp->deferred && |
724 | (cmdstatp->flags & SENSE_EOM) && |
725 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || |
726 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && |
727 | (!cmdstatp->remainder_valid || |
728 | cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */ |
729 | STp->dirty = 0; |
730 | (STp->buffer)->buffer_bytes = 0; |
731 | if (STps->drv_block >= 0) |
732 | STps->drv_block += blks; |
733 | result = (-ENOSPC); |
734 | } else { |
735 | printk(KERN_ERR "%s: Error on flush.\n", |
736 | tape_name(STp)); |
737 | STps->drv_block = (-1); |
738 | result = (-EIO); |
739 | } |
740 | } else { |
741 | if (STps->drv_block >= 0) |
742 | STps->drv_block += blks; |
743 | STp->dirty = 0; |
744 | (STp->buffer)->buffer_bytes = 0; |
745 | } |
746 | st_release_request(SRpnt); |
747 | SRpnt = NULL; |
748 | } |
749 | return result; |
750 | } |
751 | |
752 | |
753 | /* Flush the tape buffer. The tape will be positioned correctly unless |
754 | seek_next is true. */ |
755 | static int flush_buffer(struct scsi_tape *STp, int seek_next) |
756 | { |
757 | int backspace, result; |
758 | struct st_buffer *STbuffer; |
759 | struct st_partstat *STps; |
760 | |
761 | STbuffer = STp->buffer; |
762 | |
763 | /* |
764 | * If there was a bus reset, block further access |
765 | * to this device. |
766 | */ |
767 | if (STp->pos_unknown) |
768 | return (-EIO); |
769 | |
770 | if (STp->ready != ST_READY) |
771 | return 0; |
772 | STps = &(STp->ps[STp->partition]); |
773 | if (STps->rw == ST_WRITING) /* Writing */ |
774 | return st_flush_write_buffer(STp); |
775 | |
776 | if (STp->block_size == 0) |
777 | return 0; |
778 | |
779 | backspace = ((STp->buffer)->buffer_bytes + |
780 | (STp->buffer)->read_pointer) / STp->block_size - |
781 | ((STp->buffer)->read_pointer + STp->block_size - 1) / |
782 | STp->block_size; |
783 | (STp->buffer)->buffer_bytes = 0; |
784 | (STp->buffer)->read_pointer = 0; |
785 | result = 0; |
786 | if (!seek_next) { |
787 | if (STps->eof == ST_FM_HIT) { |
788 | result = cross_eof(STp, 0); /* Back over the EOF hit */ |
789 | if (!result) |
790 | STps->eof = ST_NOEOF; |
791 | else { |
792 | if (STps->drv_file >= 0) |
793 | STps->drv_file++; |
794 | STps->drv_block = 0; |
795 | } |
796 | } |
797 | if (!result && backspace > 0) |
798 | result = st_int_ioctl(STp, MTBSR, backspace); |
799 | } else if (STps->eof == ST_FM_HIT) { |
800 | if (STps->drv_file >= 0) |
801 | STps->drv_file++; |
802 | STps->drv_block = 0; |
803 | STps->eof = ST_NOEOF; |
804 | } |
805 | return result; |
806 | |
807 | } |
808 | |
809 | /* Set the mode parameters */ |
810 | static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm) |
811 | { |
812 | int set_it = 0; |
813 | unsigned long arg; |
814 | char *name = tape_name(STp); |
815 | |
816 | if (!STp->density_changed && |
817 | STm->default_density >= 0 && |
818 | STm->default_density != STp->density) { |
819 | arg = STm->default_density; |
820 | set_it = 1; |
821 | } else |
822 | arg = STp->density; |
823 | arg <<= MT_ST_DENSITY_SHIFT; |
824 | if (!STp->blksize_changed && |
825 | STm->default_blksize >= 0 && |
826 | STm->default_blksize != STp->block_size) { |
827 | arg |= STm->default_blksize; |
828 | set_it = 1; |
829 | } else |
830 | arg |= STp->block_size; |
831 | if (set_it && |
832 | st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) { |
833 | printk(KERN_WARNING |
834 | "%s: Can't set default block size to %d bytes and density %x.\n", |
835 | name, STm->default_blksize, STm->default_density); |
836 | if (modes_defined) |
837 | return (-EINVAL); |
838 | } |
839 | return 0; |
840 | } |
841 | |
842 | |
843 | /* Lock or unlock the drive door. Don't use when st_request allocated. */ |
844 | static int do_door_lock(struct scsi_tape * STp, int do_lock) |
845 | { |
846 | int retval, cmd; |
847 | DEB(char *name = tape_name(STp);) |
848 | |
849 | |
850 | cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK; |
851 | DEBC(printk(ST_DEB_MSG "%s: %socking drive door.\n", name, |
852 | do_lock ? "L" : "Unl")); |
853 | retval = scsi_ioctl(STp->device, cmd, NULL); |
854 | if (!retval) { |
855 | STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; |
856 | } |
857 | else { |
858 | STp->door_locked = ST_LOCK_FAILS; |
859 | } |
860 | return retval; |
861 | } |
862 | |
863 | |
864 | /* Set the internal state after reset */ |
865 | static void reset_state(struct scsi_tape *STp) |
866 | { |
867 | int i; |
868 | struct st_partstat *STps; |
869 | |
870 | STp->pos_unknown = 0; |
871 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { |
872 | STps = &(STp->ps[i]); |
873 | STps->rw = ST_IDLE; |
874 | STps->eof = ST_NOEOF; |
875 | STps->at_sm = 0; |
876 | STps->last_block_valid = 0; |
877 | STps->drv_block = -1; |
878 | STps->drv_file = -1; |
879 | } |
880 | if (STp->can_partitions) { |
881 | STp->partition = find_partition(STp); |
882 | if (STp->partition < 0) |
883 | STp->partition = 0; |
884 | STp->new_partition = STp->partition; |
885 | } |
886 | } |
887 | |
888 | /* Test if the drive is ready. Returns either one of the codes below or a negative system |
889 | error code. */ |
890 | #define CHKRES_READY 0 |
891 | #define CHKRES_NEW_SESSION 1 |
892 | #define CHKRES_NOT_READY 2 |
893 | #define CHKRES_NO_TAPE 3 |
894 | |
895 | #define MAX_ATTENTIONS 10 |
896 | |
897 | static int test_ready(struct scsi_tape *STp, int do_wait) |
898 | { |
899 | int attentions, waits, max_wait, scode; |
900 | int retval = CHKRES_READY, new_session = 0; |
901 | unsigned char cmd[MAX_COMMAND_SIZE]; |
902 | struct st_request *SRpnt = NULL; |
903 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; |
904 | |
905 | max_wait = do_wait ? ST_BLOCK_SECONDS : 0; |
906 | |
907 | for (attentions=waits=0; ; ) { |
908 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); |
909 | cmd[0] = TEST_UNIT_READY; |
910 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, |
911 | STp->long_timeout, MAX_READY_RETRIES, 1); |
912 | |
913 | if (!SRpnt) { |
914 | retval = (STp->buffer)->syscall_result; |
915 | break; |
916 | } |
917 | |
918 | if (cmdstatp->have_sense) { |
919 | |
920 | scode = cmdstatp->sense_hdr.sense_key; |
921 | |
922 | if (scode == UNIT_ATTENTION) { /* New media? */ |
923 | new_session = 1; |
924 | if (attentions < MAX_ATTENTIONS) { |
925 | attentions++; |
926 | continue; |
927 | } |
928 | else { |
929 | retval = (-EIO); |
930 | break; |
931 | } |
932 | } |
933 | |
934 | if (scode == NOT_READY) { |
935 | if (waits < max_wait) { |
936 | if (msleep_interruptible(1000)) { |
937 | retval = (-EINTR); |
938 | break; |
939 | } |
940 | waits++; |
941 | continue; |
942 | } |
943 | else { |
944 | if ((STp->device)->scsi_level >= SCSI_2 && |
945 | cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */ |
946 | retval = CHKRES_NO_TAPE; |
947 | else |
948 | retval = CHKRES_NOT_READY; |
949 | break; |
950 | } |
951 | } |
952 | } |
953 | |
954 | retval = (STp->buffer)->syscall_result; |
955 | if (!retval) |
956 | retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY; |
957 | break; |
958 | } |
959 | |
960 | if (SRpnt != NULL) |
961 | st_release_request(SRpnt); |
962 | return retval; |
963 | } |
964 | |
965 | |
966 | /* See if the drive is ready and gather information about the tape. Return values: |
967 | < 0 negative error code from errno.h |
968 | 0 drive ready |
969 | 1 drive not ready (possibly no tape) |
970 | */ |
971 | static int check_tape(struct scsi_tape *STp, struct file *filp) |
972 | { |
973 | int i, retval, new_session = 0, do_wait; |
974 | unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning; |
975 | unsigned short st_flags = filp->f_flags; |
976 | struct st_request *SRpnt = NULL; |
977 | struct st_modedef *STm; |
978 | struct st_partstat *STps; |
979 | char *name = tape_name(STp); |
980 | struct inode *inode = file_inode(filp); |
981 | int mode = TAPE_MODE(inode); |
982 | |
983 | STp->ready = ST_READY; |
984 | |
985 | if (mode != STp->current_mode) { |
986 | DEBC(printk(ST_DEB_MSG "%s: Mode change from %d to %d.\n", |
987 | name, STp->current_mode, mode)); |
988 | new_session = 1; |
989 | STp->current_mode = mode; |
990 | } |
991 | STm = &(STp->modes[STp->current_mode]); |
992 | |
993 | saved_cleaning = STp->cleaning_req; |
994 | STp->cleaning_req = 0; |
995 | |
996 | do_wait = ((filp->f_flags & O_NONBLOCK) == 0); |
997 | retval = test_ready(STp, do_wait); |
998 | |
999 | if (retval < 0) |
1000 | goto err_out; |
1001 | |
1002 | if (retval == CHKRES_NEW_SESSION) { |
1003 | STp->pos_unknown = 0; |
1004 | STp->partition = STp->new_partition = 0; |
1005 | if (STp->can_partitions) |
1006 | STp->nbr_partitions = 1; /* This guess will be updated later |
1007 | if necessary */ |
1008 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { |
1009 | STps = &(STp->ps[i]); |
1010 | STps->rw = ST_IDLE; |
1011 | STps->eof = ST_NOEOF; |
1012 | STps->at_sm = 0; |
1013 | STps->last_block_valid = 0; |
1014 | STps->drv_block = 0; |
1015 | STps->drv_file = 0; |
1016 | } |
1017 | new_session = 1; |
1018 | } |
1019 | else { |
1020 | STp->cleaning_req |= saved_cleaning; |
1021 | |
1022 | if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) { |
1023 | if (retval == CHKRES_NO_TAPE) |
1024 | STp->ready = ST_NO_TAPE; |
1025 | else |
1026 | STp->ready = ST_NOT_READY; |
1027 | |
1028 | STp->density = 0; /* Clear the erroneous "residue" */ |
1029 | STp->write_prot = 0; |
1030 | STp->block_size = 0; |
1031 | STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); |
1032 | STp->partition = STp->new_partition = 0; |
1033 | STp->door_locked = ST_UNLOCKED; |
1034 | return CHKRES_NOT_READY; |
1035 | } |
1036 | } |
1037 | |
1038 | if (STp->omit_blklims) |
1039 | STp->min_block = STp->max_block = (-1); |
1040 | else { |
1041 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); |
1042 | cmd[0] = READ_BLOCK_LIMITS; |
1043 | |
1044 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, |
1045 | STp->device->request_queue->rq_timeout, |
1046 | MAX_READY_RETRIES, 1); |
1047 | if (!SRpnt) { |
1048 | retval = (STp->buffer)->syscall_result; |
1049 | goto err_out; |
1050 | } |
1051 | |
1052 | if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) { |
1053 | STp->max_block = ((STp->buffer)->b_data[1] << 16) | |
1054 | ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; |
1055 | STp->min_block = ((STp->buffer)->b_data[4] << 8) | |
1056 | (STp->buffer)->b_data[5]; |
1057 | if ( DEB( debugging || ) !STp->inited) |
1058 | printk(KERN_INFO |
1059 | "%s: Block limits %d - %d bytes.\n", name, |
1060 | STp->min_block, STp->max_block); |
1061 | } else { |
1062 | STp->min_block = STp->max_block = (-1); |
1063 | DEBC(printk(ST_DEB_MSG "%s: Can't read block limits.\n", |
1064 | name)); |
1065 | } |
1066 | } |
1067 | |
1068 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); |
1069 | cmd[0] = MODE_SENSE; |
1070 | cmd[4] = 12; |
1071 | |
1072 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, |
1073 | STp->device->request_queue->rq_timeout, |
1074 | MAX_READY_RETRIES, 1); |
1075 | if (!SRpnt) { |
1076 | retval = (STp->buffer)->syscall_result; |
1077 | goto err_out; |
1078 | } |
1079 | |
1080 | if ((STp->buffer)->syscall_result != 0) { |
1081 | DEBC(printk(ST_DEB_MSG "%s: No Mode Sense.\n", name)); |
1082 | STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ |
1083 | (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ |
1084 | STp->drv_write_prot = 0; |
1085 | } else { |
1086 | DEBC(printk(ST_DEB_MSG |
1087 | "%s: Mode sense. Length %d, medium %x, WBS %x, BLL %d\n", |
1088 | name, |
1089 | (STp->buffer)->b_data[0], (STp->buffer)->b_data[1], |
1090 | (STp->buffer)->b_data[2], (STp->buffer)->b_data[3])); |
1091 | |
1092 | if ((STp->buffer)->b_data[3] >= 8) { |
1093 | STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; |
1094 | STp->density = (STp->buffer)->b_data[4]; |
1095 | STp->block_size = (STp->buffer)->b_data[9] * 65536 + |
1096 | (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; |
1097 | DEBC(printk(ST_DEB_MSG |
1098 | "%s: Density %x, tape length: %x, drv buffer: %d\n", |
1099 | name, STp->density, (STp->buffer)->b_data[5] * 65536 + |
1100 | (STp->buffer)->b_data[6] * 256 + (STp->buffer)->b_data[7], |
1101 | STp->drv_buffer)); |
1102 | } |
1103 | STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; |
1104 | if (!STp->drv_buffer && STp->immediate_filemark) { |
1105 | printk(KERN_WARNING |
1106 | "%s: non-buffered tape: disabling writing immediate filemarks\n", |
1107 | name); |
1108 | STp->immediate_filemark = 0; |
1109 | } |
1110 | } |
1111 | st_release_request(SRpnt); |
1112 | SRpnt = NULL; |
1113 | STp->inited = 1; |
1114 | |
1115 | if (STp->block_size > 0) |
1116 | (STp->buffer)->buffer_blocks = |
1117 | (STp->buffer)->buffer_size / STp->block_size; |
1118 | else |
1119 | (STp->buffer)->buffer_blocks = 1; |
1120 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; |
1121 | |
1122 | DEBC(printk(ST_DEB_MSG |
1123 | "%s: Block size: %d, buffer size: %d (%d blocks).\n", name, |
1124 | STp->block_size, (STp->buffer)->buffer_size, |
1125 | (STp->buffer)->buffer_blocks)); |
1126 | |
1127 | if (STp->drv_write_prot) { |
1128 | STp->write_prot = 1; |
1129 | |
1130 | DEBC(printk(ST_DEB_MSG "%s: Write protected\n", name)); |
1131 | |
1132 | if (do_wait && |
1133 | ((st_flags & O_ACCMODE) == O_WRONLY || |
1134 | (st_flags & O_ACCMODE) == O_RDWR)) { |
1135 | retval = (-EROFS); |
1136 | goto err_out; |
1137 | } |
1138 | } |
1139 | |
1140 | if (STp->can_partitions && STp->nbr_partitions < 1) { |
1141 | /* This code is reached when the device is opened for the first time |
1142 | after the driver has been initialized with tape in the drive and the |
1143 | partition support has been enabled. */ |
1144 | DEBC(printk(ST_DEB_MSG |
1145 | "%s: Updating partition number in status.\n", name)); |
1146 | if ((STp->partition = find_partition(STp)) < 0) { |
1147 | retval = STp->partition; |
1148 | goto err_out; |
1149 | } |
1150 | STp->new_partition = STp->partition; |
1151 | STp->nbr_partitions = 1; /* This guess will be updated when necessary */ |
1152 | } |
1153 | |
1154 | if (new_session) { /* Change the drive parameters for the new mode */ |
1155 | STp->density_changed = STp->blksize_changed = 0; |
1156 | STp->compression_changed = 0; |
1157 | if (!(STm->defaults_for_writes) && |
1158 | (retval = set_mode_densblk(STp, STm)) < 0) |
1159 | goto err_out; |
1160 | |
1161 | if (STp->default_drvbuffer != 0xff) { |
1162 | if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer)) |
1163 | printk(KERN_WARNING |
1164 | "%s: Can't set default drive buffering to %d.\n", |
1165 | name, STp->default_drvbuffer); |
1166 | } |
1167 | } |
1168 | |
1169 | return CHKRES_READY; |
1170 | |
1171 | err_out: |
1172 | return retval; |
1173 | } |
1174 | |
1175 | |
1176 | /* Open the device. Needs to take the BKL only because of incrementing the SCSI host |
1177 | module count. */ |
1178 | static int st_open(struct inode *inode, struct file *filp) |
1179 | { |
1180 | int i, retval = (-EIO); |
1181 | int resumed = 0; |
1182 | struct scsi_tape *STp; |
1183 | struct st_partstat *STps; |
1184 | int dev = TAPE_NR(inode); |
1185 | char *name; |
1186 | |
1187 | /* |
1188 | * We really want to do nonseekable_open(inode, filp); here, but some |
1189 | * versions of tar incorrectly call lseek on tapes and bail out if that |
1190 | * fails. So we disallow pread() and pwrite(), but permit lseeks. |
1191 | */ |
1192 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); |
1193 | |
1194 | if (!(STp = scsi_tape_get(dev))) { |
1195 | return -ENXIO; |
1196 | } |
1197 | |
1198 | filp->private_data = STp; |
1199 | name = tape_name(STp); |
1200 | |
1201 | spin_lock(&st_use_lock); |
1202 | if (STp->in_use) { |
1203 | spin_unlock(&st_use_lock); |
1204 | scsi_tape_put(STp); |
1205 | DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); ) |
1206 | return (-EBUSY); |
1207 | } |
1208 | |
1209 | STp->in_use = 1; |
1210 | spin_unlock(&st_use_lock); |
1211 | STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; |
1212 | |
1213 | if (scsi_autopm_get_device(STp->device) < 0) { |
1214 | retval = -EIO; |
1215 | goto err_out; |
1216 | } |
1217 | resumed = 1; |
1218 | if (!scsi_block_when_processing_errors(STp->device)) { |
1219 | retval = (-ENXIO); |
1220 | goto err_out; |
1221 | } |
1222 | |
1223 | /* See that we have at least a one page buffer available */ |
1224 | if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) { |
1225 | printk(KERN_WARNING "%s: Can't allocate one page tape buffer.\n", |
1226 | name); |
1227 | retval = (-EOVERFLOW); |
1228 | goto err_out; |
1229 | } |
1230 | |
1231 | (STp->buffer)->cleared = 0; |
1232 | (STp->buffer)->writing = 0; |
1233 | (STp->buffer)->syscall_result = 0; |
1234 | |
1235 | STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY); |
1236 | |
1237 | STp->dirty = 0; |
1238 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { |
1239 | STps = &(STp->ps[i]); |
1240 | STps->rw = ST_IDLE; |
1241 | } |
1242 | STp->try_dio_now = STp->try_dio; |
1243 | STp->recover_count = 0; |
1244 | DEB( STp->nbr_waits = STp->nbr_finished = 0; |
1245 | STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; ) |
1246 | |
1247 | retval = check_tape(STp, filp); |
1248 | if (retval < 0) |
1249 | goto err_out; |
1250 | if ((filp->f_flags & O_NONBLOCK) == 0 && |
1251 | retval != CHKRES_READY) { |
1252 | if (STp->ready == NO_TAPE) |
1253 | retval = (-ENOMEDIUM); |
1254 | else |
1255 | retval = (-EIO); |
1256 | goto err_out; |
1257 | } |
1258 | return 0; |
1259 | |
1260 | err_out: |
1261 | normalize_buffer(STp->buffer); |
1262 | spin_lock(&st_use_lock); |
1263 | STp->in_use = 0; |
1264 | spin_unlock(&st_use_lock); |
1265 | scsi_tape_put(STp); |
1266 | if (resumed) |
1267 | scsi_autopm_put_device(STp->device); |
1268 | return retval; |
1269 | |
1270 | } |
1271 | |
1272 | |
1273 | /* Flush the tape buffer before close */ |
1274 | static int st_flush(struct file *filp, fl_owner_t id) |
1275 | { |
1276 | int result = 0, result2; |
1277 | unsigned char cmd[MAX_COMMAND_SIZE]; |
1278 | struct st_request *SRpnt; |
1279 | struct scsi_tape *STp = filp->private_data; |
1280 | struct st_modedef *STm = &(STp->modes[STp->current_mode]); |
1281 | struct st_partstat *STps = &(STp->ps[STp->partition]); |
1282 | char *name = tape_name(STp); |
1283 | |
1284 | if (file_count(filp) > 1) |
1285 | return 0; |
1286 | |
1287 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { |
1288 | result = st_flush_write_buffer(STp); |
1289 | if (result != 0 && result != (-ENOSPC)) |
1290 | goto out; |
1291 | } |
1292 | |
1293 | if (STp->can_partitions && |
1294 | (result2 = switch_partition(STp)) < 0) { |
1295 | DEBC(printk(ST_DEB_MSG |
1296 | "%s: switch_partition at close failed.\n", name)); |
1297 | if (result == 0) |
1298 | result = result2; |
1299 | goto out; |
1300 | } |
1301 | |
1302 | DEBC( if (STp->nbr_requests) |
1303 | printk(KERN_DEBUG "%s: Number of r/w requests %d, dio used in %d, pages %d.\n", |
1304 | name, STp->nbr_requests, STp->nbr_dio, STp->nbr_pages)); |
1305 | |
1306 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { |
1307 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; |
1308 | |
1309 | DEBC(printk(ST_DEB_MSG "%s: Async write waits %d, finished %d.\n", |
1310 | name, STp->nbr_waits, STp->nbr_finished); |
1311 | ) |
1312 | |
1313 | memset(cmd, 0, MAX_COMMAND_SIZE); |
1314 | cmd[0] = WRITE_FILEMARKS; |
1315 | if (STp->immediate_filemark) |
1316 | cmd[1] = 1; |
1317 | cmd[4] = 1 + STp->two_fm; |
1318 | |
1319 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
1320 | STp->device->request_queue->rq_timeout, |
1321 | MAX_WRITE_RETRIES, 1); |
1322 | if (!SRpnt) { |
1323 | result = (STp->buffer)->syscall_result; |
1324 | goto out; |
1325 | } |
1326 | |
1327 | if (STp->buffer->syscall_result == 0 || |
1328 | (cmdstatp->have_sense && !cmdstatp->deferred && |
1329 | (cmdstatp->flags & SENSE_EOM) && |
1330 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || |
1331 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && |
1332 | (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) { |
1333 | /* Write successful at EOM */ |
1334 | st_release_request(SRpnt); |
1335 | SRpnt = NULL; |
1336 | if (STps->drv_file >= 0) |
1337 | STps->drv_file++; |
1338 | STps->drv_block = 0; |
1339 | if (STp->two_fm) |
1340 | cross_eof(STp, 0); |
1341 | STps->eof = ST_FM; |
1342 | } |
1343 | else { /* Write error */ |
1344 | st_release_request(SRpnt); |
1345 | SRpnt = NULL; |
1346 | printk(KERN_ERR "%s: Error on write filemark.\n", name); |
1347 | if (result == 0) |
1348 | result = (-EIO); |
1349 | } |
1350 | |
1351 | DEBC(printk(ST_DEB_MSG "%s: Buffer flushed, %d EOF(s) written\n", |
1352 | name, cmd[4])); |
1353 | } else if (!STp->rew_at_close) { |
1354 | STps = &(STp->ps[STp->partition]); |
1355 | if (!STm->sysv || STps->rw != ST_READING) { |
1356 | if (STp->can_bsr) |
1357 | result = flush_buffer(STp, 0); |
1358 | else if (STps->eof == ST_FM_HIT) { |
1359 | result = cross_eof(STp, 0); |
1360 | if (result) { |
1361 | if (STps->drv_file >= 0) |
1362 | STps->drv_file++; |
1363 | STps->drv_block = 0; |
1364 | STps->eof = ST_FM; |
1365 | } else |
1366 | STps->eof = ST_NOEOF; |
1367 | } |
1368 | } else if ((STps->eof == ST_NOEOF && |
1369 | !(result = cross_eof(STp, 1))) || |
1370 | STps->eof == ST_FM_HIT) { |
1371 | if (STps->drv_file >= 0) |
1372 | STps->drv_file++; |
1373 | STps->drv_block = 0; |
1374 | STps->eof = ST_FM; |
1375 | } |
1376 | } |
1377 | |
1378 | out: |
1379 | if (STp->rew_at_close) { |
1380 | result2 = st_int_ioctl(STp, MTREW, 1); |
1381 | if (result == 0) |
1382 | result = result2; |
1383 | } |
1384 | return result; |
1385 | } |
1386 | |
1387 | |
1388 | /* Close the device and release it. BKL is not needed: this is the only thread |
1389 | accessing this tape. */ |
1390 | static int st_release(struct inode *inode, struct file *filp) |
1391 | { |
1392 | int result = 0; |
1393 | struct scsi_tape *STp = filp->private_data; |
1394 | |
1395 | if (STp->door_locked == ST_LOCKED_AUTO) |
1396 | do_door_lock(STp, 0); |
1397 | |
1398 | normalize_buffer(STp->buffer); |
1399 | spin_lock(&st_use_lock); |
1400 | STp->in_use = 0; |
1401 | spin_unlock(&st_use_lock); |
1402 | scsi_autopm_put_device(STp->device); |
1403 | scsi_tape_put(STp); |
1404 | |
1405 | return result; |
1406 | } |
1407 | |
1408 | /* The checks common to both reading and writing */ |
1409 | static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count) |
1410 | { |
1411 | ssize_t retval = 0; |
1412 | |
1413 | /* |
1414 | * If we are in the middle of error recovery, don't let anyone |
1415 | * else try and use this device. Also, if error recovery fails, it |
1416 | * may try and take the device offline, in which case all further |
1417 | * access to the device is prohibited. |
1418 | */ |
1419 | if (!scsi_block_when_processing_errors(STp->device)) { |
1420 | retval = (-ENXIO); |
1421 | goto out; |
1422 | } |
1423 | |
1424 | if (STp->ready != ST_READY) { |
1425 | if (STp->ready == ST_NO_TAPE) |
1426 | retval = (-ENOMEDIUM); |
1427 | else |
1428 | retval = (-EIO); |
1429 | goto out; |
1430 | } |
1431 | |
1432 | if (! STp->modes[STp->current_mode].defined) { |
1433 | retval = (-ENXIO); |
1434 | goto out; |
1435 | } |
1436 | |
1437 | |
1438 | /* |
1439 | * If there was a bus reset, block further access |
1440 | * to this device. |
1441 | */ |
1442 | if (STp->pos_unknown) { |
1443 | retval = (-EIO); |
1444 | goto out; |
1445 | } |
1446 | |
1447 | if (count == 0) |
1448 | goto out; |
1449 | |
1450 | DEB( |
1451 | if (!STp->in_use) { |
1452 | printk(ST_DEB_MSG "%s: Incorrect device.\n", tape_name(STp)); |
1453 | retval = (-EIO); |
1454 | goto out; |
1455 | } ) /* end DEB */ |
1456 | |
1457 | if (STp->can_partitions && |
1458 | (retval = switch_partition(STp)) < 0) |
1459 | goto out; |
1460 | |
1461 | if (STp->block_size == 0 && STp->max_block > 0 && |
1462 | (count < STp->min_block || count > STp->max_block)) { |
1463 | retval = (-EINVAL); |
1464 | goto out; |
1465 | } |
1466 | |
1467 | if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && |
1468 | !do_door_lock(STp, 1)) |
1469 | STp->door_locked = ST_LOCKED_AUTO; |
1470 | |
1471 | out: |
1472 | return retval; |
1473 | } |
1474 | |
1475 | |
1476 | static int setup_buffering(struct scsi_tape *STp, const char __user *buf, |
1477 | size_t count, int is_read) |
1478 | { |
1479 | int i, bufsize, retval = 0; |
1480 | struct st_buffer *STbp = STp->buffer; |
1481 | |
1482 | if (is_read) |
1483 | i = STp->try_dio_now && try_rdio; |
1484 | else |
1485 | i = STp->try_dio_now && try_wdio; |
1486 | |
1487 | if (i && ((unsigned long)buf & queue_dma_alignment( |
1488 | STp->device->request_queue)) == 0) { |
1489 | i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf, |
1490 | count, (is_read ? READ : WRITE)); |
1491 | if (i > 0) { |
1492 | STbp->do_dio = i; |
1493 | STbp->buffer_bytes = 0; /* can be used as transfer counter */ |
1494 | } |
1495 | else |
1496 | STbp->do_dio = 0; /* fall back to buffering with any error */ |
1497 | STbp->sg_segs = STbp->do_dio; |
1498 | DEB( |
1499 | if (STbp->do_dio) { |
1500 | STp->nbr_dio++; |
1501 | STp->nbr_pages += STbp->do_dio; |
1502 | } |
1503 | ) |
1504 | } else |
1505 | STbp->do_dio = 0; |
1506 | DEB( STp->nbr_requests++; ) |
1507 | |
1508 | if (!STbp->do_dio) { |
1509 | if (STp->block_size) |
1510 | bufsize = STp->block_size > st_fixed_buffer_size ? |
1511 | STp->block_size : st_fixed_buffer_size; |
1512 | else { |
1513 | bufsize = count; |
1514 | /* Make sure that data from previous user is not leaked even if |
1515 | HBA does not return correct residual */ |
1516 | if (is_read && STp->sili && !STbp->cleared) |
1517 | clear_buffer(STbp); |
1518 | } |
1519 | |
1520 | if (bufsize > STbp->buffer_size && |
1521 | !enlarge_buffer(STbp, bufsize, STp->restr_dma)) { |
1522 | printk(KERN_WARNING "%s: Can't allocate %d byte tape buffer.\n", |
1523 | tape_name(STp), bufsize); |
1524 | retval = (-EOVERFLOW); |
1525 | goto out; |
1526 | } |
1527 | if (STp->block_size) |
1528 | STbp->buffer_blocks = bufsize / STp->block_size; |
1529 | } |
1530 | |
1531 | out: |
1532 | return retval; |
1533 | } |
1534 | |
1535 | |
1536 | /* Can be called more than once after each setup_buffer() */ |
1537 | static void release_buffering(struct scsi_tape *STp, int is_read) |
1538 | { |
1539 | struct st_buffer *STbp; |
1540 | |
1541 | STbp = STp->buffer; |
1542 | if (STbp->do_dio) { |
1543 | sgl_unmap_user_pages(STbp, STbp->do_dio, is_read); |
1544 | STbp->do_dio = 0; |
1545 | STbp->sg_segs = 0; |
1546 | } |
1547 | } |
1548 | |
1549 | |
1550 | /* Write command */ |
1551 | static ssize_t |
1552 | st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) |
1553 | { |
1554 | ssize_t total; |
1555 | ssize_t i, do_count, blks, transfer; |
1556 | ssize_t retval; |
1557 | int undone, retry_eot = 0, scode; |
1558 | int async_write; |
1559 | unsigned char cmd[MAX_COMMAND_SIZE]; |
1560 | const char __user *b_point; |
1561 | struct st_request *SRpnt = NULL; |
1562 | struct scsi_tape *STp = filp->private_data; |
1563 | struct st_modedef *STm; |
1564 | struct st_partstat *STps; |
1565 | struct st_buffer *STbp; |
1566 | char *name = tape_name(STp); |
1567 | |
1568 | if (mutex_lock_interruptible(&STp->lock)) |
1569 | return -ERESTARTSYS; |
1570 | |
1571 | retval = rw_checks(STp, filp, count); |
1572 | if (retval || count == 0) |
1573 | goto out; |
1574 | |
1575 | /* Write must be integral number of blocks */ |
1576 | if (STp->block_size != 0 && (count % STp->block_size) != 0) { |
1577 | printk(KERN_WARNING "%s: Write not multiple of tape block size.\n", |
1578 | name); |
1579 | retval = (-EINVAL); |
1580 | goto out; |
1581 | } |
1582 | |
1583 | STm = &(STp->modes[STp->current_mode]); |
1584 | STps = &(STp->ps[STp->partition]); |
1585 | |
1586 | if (STp->write_prot) { |
1587 | retval = (-EACCES); |
1588 | goto out; |
1589 | } |
1590 | |
1591 | |
1592 | if (STps->rw == ST_READING) { |
1593 | retval = flush_buffer(STp, 0); |
1594 | if (retval) |
1595 | goto out; |
1596 | STps->rw = ST_WRITING; |
1597 | } else if (STps->rw != ST_WRITING && |
1598 | STps->drv_file == 0 && STps->drv_block == 0) { |
1599 | if ((retval = set_mode_densblk(STp, STm)) < 0) |
1600 | goto out; |
1601 | if (STm->default_compression != ST_DONT_TOUCH && |
1602 | !(STp->compression_changed)) { |
1603 | if (st_compression(STp, (STm->default_compression == ST_YES))) { |
1604 | printk(KERN_WARNING "%s: Can't set default compression.\n", |
1605 | name); |
1606 | if (modes_defined) { |
1607 | retval = (-EINVAL); |
1608 | goto out; |
1609 | } |
1610 | } |
1611 | } |
1612 | } |
1613 | |
1614 | STbp = STp->buffer; |
1615 | i = write_behind_check(STp); |
1616 | if (i) { |
1617 | if (i == -ENOSPC) |
1618 | STps->eof = ST_EOM_OK; |
1619 | else |
1620 | STps->eof = ST_EOM_ERROR; |
1621 | } |
1622 | |
1623 | if (STps->eof == ST_EOM_OK) { |
1624 | STps->eof = ST_EOD_1; /* allow next write */ |
1625 | retval = (-ENOSPC); |
1626 | goto out; |
1627 | } |
1628 | else if (STps->eof == ST_EOM_ERROR) { |
1629 | retval = (-EIO); |
1630 | goto out; |
1631 | } |
1632 | |
1633 | /* Check the buffer readability in cases where copy_user might catch |
1634 | the problems after some tape movement. */ |
1635 | if (STp->block_size != 0 && |
1636 | !STbp->do_dio && |
1637 | (copy_from_user(&i, buf, 1) != 0 || |
1638 | copy_from_user(&i, buf + count - 1, 1) != 0)) { |
1639 | retval = (-EFAULT); |
1640 | goto out; |
1641 | } |
1642 | |
1643 | retval = setup_buffering(STp, buf, count, 0); |
1644 | if (retval) |
1645 | goto out; |
1646 | |
1647 | total = count; |
1648 | |
1649 | memset(cmd, 0, MAX_COMMAND_SIZE); |
1650 | cmd[0] = WRITE_6; |
1651 | cmd[1] = (STp->block_size != 0); |
1652 | |
1653 | STps->rw = ST_WRITING; |
1654 | |
1655 | b_point = buf; |
1656 | while (count > 0 && !retry_eot) { |
1657 | |
1658 | if (STbp->do_dio) { |
1659 | do_count = count; |
1660 | } |
1661 | else { |
1662 | if (STp->block_size == 0) |
1663 | do_count = count; |
1664 | else { |
1665 | do_count = STbp->buffer_blocks * STp->block_size - |
1666 | STbp->buffer_bytes; |
1667 | if (do_count > count) |
1668 | do_count = count; |
1669 | } |
1670 | |
1671 | i = append_to_buffer(b_point, STbp, do_count); |
1672 | if (i) { |
1673 | retval = i; |
1674 | goto out; |
1675 | } |
1676 | } |
1677 | count -= do_count; |
1678 | b_point += do_count; |
1679 | |
1680 | async_write = STp->block_size == 0 && !STbp->do_dio && |
1681 | STm->do_async_writes && STps->eof < ST_EOM_OK; |
1682 | |
1683 | if (STp->block_size != 0 && STm->do_buffer_writes && |
1684 | !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK && |
1685 | STbp->buffer_bytes < STbp->buffer_size) { |
1686 | STp->dirty = 1; |
1687 | /* Don't write a buffer that is not full enough. */ |
1688 | if (!async_write && count == 0) |
1689 | break; |
1690 | } |
1691 | |
1692 | retry_write: |
1693 | if (STp->block_size == 0) |
1694 | blks = transfer = do_count; |
1695 | else { |
1696 | if (!STbp->do_dio) |
1697 | blks = STbp->buffer_bytes; |
1698 | else |
1699 | blks = do_count; |
1700 | blks /= STp->block_size; |
1701 | transfer = blks * STp->block_size; |
1702 | } |
1703 | cmd[2] = blks >> 16; |
1704 | cmd[3] = blks >> 8; |
1705 | cmd[4] = blks; |
1706 | |
1707 | SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE, |
1708 | STp->device->request_queue->rq_timeout, |
1709 | MAX_WRITE_RETRIES, !async_write); |
1710 | if (!SRpnt) { |
1711 | retval = STbp->syscall_result; |
1712 | goto out; |
1713 | } |
1714 | if (async_write && !STbp->syscall_result) { |
1715 | STbp->writing = transfer; |
1716 | STp->dirty = !(STbp->writing == |
1717 | STbp->buffer_bytes); |
1718 | SRpnt = NULL; /* Prevent releasing this request! */ |
1719 | DEB( STp->write_pending = 1; ) |
1720 | break; |
1721 | } |
1722 | |
1723 | if (STbp->syscall_result != 0) { |
1724 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; |
1725 | |
1726 | DEBC(printk(ST_DEB_MSG "%s: Error on write:\n", name)); |
1727 | if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) { |
1728 | scode = cmdstatp->sense_hdr.sense_key; |
1729 | if (cmdstatp->remainder_valid) |
1730 | undone = (int)cmdstatp->uremainder64; |
1731 | else if (STp->block_size == 0 && |
1732 | scode == VOLUME_OVERFLOW) |
1733 | undone = transfer; |
1734 | else |
1735 | undone = 0; |
1736 | if (STp->block_size != 0) |
1737 | undone *= STp->block_size; |
1738 | if (undone <= do_count) { |
1739 | /* Only data from this write is not written */ |
1740 | count += undone; |
1741 | b_point -= undone; |
1742 | do_count -= undone; |
1743 | if (STp->block_size) |
1744 | blks = (transfer - undone) / STp->block_size; |
1745 | STps->eof = ST_EOM_OK; |
1746 | /* Continue in fixed block mode if all written |
1747 | in this request but still something left to write |
1748 | (retval left to zero) |
1749 | */ |
1750 | if (STp->block_size == 0 || |
1751 | undone > 0 || count == 0) |
1752 | retval = (-ENOSPC); /* EOM within current request */ |
1753 | DEBC(printk(ST_DEB_MSG |
1754 | "%s: EOM with %d bytes unwritten.\n", |
1755 | name, (int)count)); |
1756 | } else { |
1757 | /* EOT within data buffered earlier (possible only |
1758 | in fixed block mode without direct i/o) */ |
1759 | if (!retry_eot && !cmdstatp->deferred && |
1760 | (scode == NO_SENSE || scode == RECOVERED_ERROR)) { |
1761 | move_buffer_data(STp->buffer, transfer - undone); |
1762 | retry_eot = 1; |
1763 | if (STps->drv_block >= 0) { |
1764 | STps->drv_block += (transfer - undone) / |
1765 | STp->block_size; |
1766 | } |
1767 | STps->eof = ST_EOM_OK; |
1768 | DEBC(printk(ST_DEB_MSG |
1769 | "%s: Retry write of %d bytes at EOM.\n", |
1770 | name, STp->buffer->buffer_bytes)); |
1771 | goto retry_write; |
1772 | } |
1773 | else { |
1774 | /* Either error within data buffered by driver or |
1775 | failed retry */ |
1776 | count -= do_count; |
1777 | blks = do_count = 0; |
1778 | STps->eof = ST_EOM_ERROR; |
1779 | STps->drv_block = (-1); /* Too cautious? */ |
1780 | retval = (-EIO); /* EOM for old data */ |
1781 | DEBC(printk(ST_DEB_MSG |
1782 | "%s: EOM with lost data.\n", |
1783 | name)); |
1784 | } |
1785 | } |
1786 | } else { |
1787 | count += do_count; |
1788 | STps->drv_block = (-1); /* Too cautious? */ |
1789 | retval = STbp->syscall_result; |
1790 | } |
1791 | |
1792 | } |
1793 | |
1794 | if (STps->drv_block >= 0) { |
1795 | if (STp->block_size == 0) |
1796 | STps->drv_block += (do_count > 0); |
1797 | else |
1798 | STps->drv_block += blks; |
1799 | } |
1800 | |
1801 | STbp->buffer_bytes = 0; |
1802 | STp->dirty = 0; |
1803 | |
1804 | if (retval || retry_eot) { |
1805 | if (count < total) |
1806 | retval = total - count; |
1807 | goto out; |
1808 | } |
1809 | } |
1810 | |
1811 | if (STps->eof == ST_EOD_1) |
1812 | STps->eof = ST_EOM_OK; |
1813 | else if (STps->eof != ST_EOM_OK) |
1814 | STps->eof = ST_NOEOF; |
1815 | retval = total - count; |
1816 | |
1817 | out: |
1818 | if (SRpnt != NULL) |
1819 | st_release_request(SRpnt); |
1820 | release_buffering(STp, 0); |
1821 | mutex_unlock(&STp->lock); |
1822 | |
1823 | return retval; |
1824 | } |
1825 | |
1826 | /* Read data from the tape. Returns zero in the normal case, one if the |
1827 | eof status has changed, and the negative error code in case of a |
1828 | fatal error. Otherwise updates the buffer and the eof state. |
1829 | |
1830 | Does release user buffer mapping if it is set. |
1831 | */ |
1832 | static long read_tape(struct scsi_tape *STp, long count, |
1833 | struct st_request ** aSRpnt) |
1834 | { |
1835 | int transfer, blks, bytes; |
1836 | unsigned char cmd[MAX_COMMAND_SIZE]; |
1837 | struct st_request *SRpnt; |
1838 | struct st_modedef *STm; |
1839 | struct st_partstat *STps; |
1840 | struct st_buffer *STbp; |
1841 | int retval = 0; |
1842 | char *name = tape_name(STp); |
1843 | |
1844 | if (count == 0) |
1845 | return 0; |
1846 | |
1847 | STm = &(STp->modes[STp->current_mode]); |
1848 | STps = &(STp->ps[STp->partition]); |
1849 | if (STps->eof == ST_FM_HIT) |
1850 | return 1; |
1851 | STbp = STp->buffer; |
1852 | |
1853 | if (STp->block_size == 0) |
1854 | blks = bytes = count; |
1855 | else { |
1856 | if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) { |
1857 | blks = (STp->buffer)->buffer_blocks; |
1858 | bytes = blks * STp->block_size; |
1859 | } else { |
1860 | bytes = count; |
1861 | if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size) |
1862 | bytes = (STp->buffer)->buffer_size; |
1863 | blks = bytes / STp->block_size; |
1864 | bytes = blks * STp->block_size; |
1865 | } |
1866 | } |
1867 | |
1868 | memset(cmd, 0, MAX_COMMAND_SIZE); |
1869 | cmd[0] = READ_6; |
1870 | cmd[1] = (STp->block_size != 0); |
1871 | if (!cmd[1] && STp->sili) |
1872 | cmd[1] |= 2; |
1873 | cmd[2] = blks >> 16; |
1874 | cmd[3] = blks >> 8; |
1875 | cmd[4] = blks; |
1876 | |
1877 | SRpnt = *aSRpnt; |
1878 | SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE, |
1879 | STp->device->request_queue->rq_timeout, |
1880 | MAX_RETRIES, 1); |
1881 | release_buffering(STp, 1); |
1882 | *aSRpnt = SRpnt; |
1883 | if (!SRpnt) |
1884 | return STbp->syscall_result; |
1885 | |
1886 | STbp->read_pointer = 0; |
1887 | STps->at_sm = 0; |
1888 | |
1889 | /* Something to check */ |
1890 | if (STbp->syscall_result) { |
1891 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; |
1892 | |
1893 | retval = 1; |
1894 | DEBC(printk(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", |
1895 | name, |
1896 | SRpnt->sense[0], SRpnt->sense[1], |
1897 | SRpnt->sense[2], SRpnt->sense[3], |
1898 | SRpnt->sense[4], SRpnt->sense[5], |
1899 | SRpnt->sense[6], SRpnt->sense[7])); |
1900 | if (cmdstatp->have_sense) { |
1901 | |
1902 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) |
1903 | cmdstatp->flags &= 0xcf; /* No need for EOM in this case */ |
1904 | |
1905 | if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */ |
1906 | /* Compute the residual count */ |
1907 | if (cmdstatp->remainder_valid) |
1908 | transfer = (int)cmdstatp->uremainder64; |
1909 | else |
1910 | transfer = 0; |
1911 | if (STp->block_size == 0 && |
1912 | cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) |
1913 | transfer = bytes; |
1914 | |
1915 | if (cmdstatp->flags & SENSE_ILI) { /* ILI */ |
1916 | if (STp->block_size == 0) { |
1917 | if (transfer <= 0) { |
1918 | if (transfer < 0) |
1919 | printk(KERN_NOTICE |
1920 | "%s: Failed to read %d byte block with %d byte transfer.\n", |
1921 | name, bytes - transfer, bytes); |
1922 | if (STps->drv_block >= 0) |
1923 | STps->drv_block += 1; |
1924 | STbp->buffer_bytes = 0; |
1925 | return (-ENOMEM); |
1926 | } |
1927 | STbp->buffer_bytes = bytes - transfer; |
1928 | } else { |
1929 | st_release_request(SRpnt); |
1930 | SRpnt = *aSRpnt = NULL; |
1931 | if (transfer == blks) { /* We did not get anything, error */ |
1932 | printk(KERN_NOTICE "%s: Incorrect block size.\n", name); |
1933 | if (STps->drv_block >= 0) |
1934 | STps->drv_block += blks - transfer + 1; |
1935 | st_int_ioctl(STp, MTBSR, 1); |
1936 | return (-EIO); |
1937 | } |
1938 | /* We have some data, deliver it */ |
1939 | STbp->buffer_bytes = (blks - transfer) * |
1940 | STp->block_size; |
1941 | DEBC(printk(ST_DEB_MSG |
1942 | "%s: ILI but enough data received %ld %d.\n", |
1943 | name, count, STbp->buffer_bytes)); |
1944 | if (STps->drv_block >= 0) |
1945 | STps->drv_block += 1; |
1946 | if (st_int_ioctl(STp, MTBSR, 1)) |
1947 | return (-EIO); |
1948 | } |
1949 | } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */ |
1950 | if (STps->eof != ST_FM_HIT) |
1951 | STps->eof = ST_FM_HIT; |
1952 | else |
1953 | STps->eof = ST_EOD_2; |
1954 | if (STp->block_size == 0) |
1955 | STbp->buffer_bytes = 0; |
1956 | else |
1957 | STbp->buffer_bytes = |
1958 | bytes - transfer * STp->block_size; |
1959 | DEBC(printk(ST_DEB_MSG |
1960 | "%s: EOF detected (%d bytes read).\n", |
1961 | name, STbp->buffer_bytes)); |
1962 | } else if (cmdstatp->flags & SENSE_EOM) { |
1963 | if (STps->eof == ST_FM) |
1964 | STps->eof = ST_EOD_1; |
1965 | else |
1966 | STps->eof = ST_EOM_OK; |
1967 | if (STp->block_size == 0) |
1968 | STbp->buffer_bytes = bytes - transfer; |
1969 | else |
1970 | STbp->buffer_bytes = |
1971 | bytes - transfer * STp->block_size; |
1972 | |
1973 | DEBC(printk(ST_DEB_MSG "%s: EOM detected (%d bytes read).\n", |
1974 | name, STbp->buffer_bytes)); |
1975 | } |
1976 | } |
1977 | /* end of EOF, EOM, ILI test */ |
1978 | else { /* nonzero sense key */ |
1979 | DEBC(printk(ST_DEB_MSG |
1980 | "%s: Tape error while reading.\n", name)); |
1981 | STps->drv_block = (-1); |
1982 | if (STps->eof == ST_FM && |
1983 | cmdstatp->sense_hdr.sense_key == BLANK_CHECK) { |
1984 | DEBC(printk(ST_DEB_MSG |
1985 | "%s: Zero returned for first BLANK CHECK after EOF.\n", |
1986 | name)); |
1987 | STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */ |
1988 | } else /* Some other extended sense code */ |
1989 | retval = (-EIO); |
1990 | } |
1991 | |
1992 | if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */ |
1993 | STbp->buffer_bytes = 0; |
1994 | } |
1995 | /* End of extended sense test */ |
1996 | else { /* Non-extended sense */ |
1997 | retval = STbp->syscall_result; |
1998 | } |
1999 | |
2000 | } |
2001 | /* End of error handling */ |
2002 | else { /* Read successful */ |
2003 | STbp->buffer_bytes = bytes; |
2004 | if (STp->sili) /* In fixed block mode residual is always zero here */ |
2005 | STbp->buffer_bytes -= STp->buffer->cmdstat.residual; |
2006 | } |
2007 | |
2008 | if (STps->drv_block >= 0) { |
2009 | if (STp->block_size == 0) |
2010 | STps->drv_block++; |
2011 | else |
2012 | STps->drv_block += STbp->buffer_bytes / STp->block_size; |
2013 | } |
2014 | return retval; |
2015 | } |
2016 | |
2017 | |
2018 | /* Read command */ |
2019 | static ssize_t |
2020 | st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) |
2021 | { |
2022 | ssize_t total; |
2023 | ssize_t retval = 0; |
2024 | ssize_t i, transfer; |
2025 | int special, do_dio = 0; |
2026 | struct st_request *SRpnt = NULL; |
2027 | struct scsi_tape *STp = filp->private_data; |
2028 | struct st_modedef *STm; |
2029 | struct st_partstat *STps; |
2030 | struct st_buffer *STbp = STp->buffer; |
2031 | DEB( char *name = tape_name(STp); ) |
2032 | |
2033 | if (mutex_lock_interruptible(&STp->lock)) |
2034 | return -ERESTARTSYS; |
2035 | |
2036 | retval = rw_checks(STp, filp, count); |
2037 | if (retval || count == 0) |
2038 | goto out; |
2039 | |
2040 | STm = &(STp->modes[STp->current_mode]); |
2041 | if (STp->block_size != 0 && (count % STp->block_size) != 0) { |
2042 | if (!STm->do_read_ahead) { |
2043 | retval = (-EINVAL); /* Read must be integral number of blocks */ |
2044 | goto out; |
2045 | } |
2046 | STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */ |
2047 | } |
2048 | |
2049 | STps = &(STp->ps[STp->partition]); |
2050 | if (STps->rw == ST_WRITING) { |
2051 | retval = flush_buffer(STp, 0); |
2052 | if (retval) |
2053 | goto out; |
2054 | STps->rw = ST_READING; |
2055 | } |
2056 | DEB( |
2057 | if (debugging && STps->eof != ST_NOEOF) |
2058 | printk(ST_DEB_MSG "%s: EOF/EOM flag up (%d). Bytes %d\n", name, |
2059 | STps->eof, STbp->buffer_bytes); |
2060 | ) /* end DEB */ |
2061 | |
2062 | retval = setup_buffering(STp, buf, count, 1); |
2063 | if (retval) |
2064 | goto out; |
2065 | do_dio = STbp->do_dio; |
2066 | |
2067 | if (STbp->buffer_bytes == 0 && |
2068 | STps->eof >= ST_EOD_1) { |
2069 | if (STps->eof < ST_EOD) { |
2070 | STps->eof += 1; |
2071 | retval = 0; |
2072 | goto out; |
2073 | } |
2074 | retval = (-EIO); /* EOM or Blank Check */ |
2075 | goto out; |
2076 | } |
2077 | |
2078 | if (do_dio) { |
2079 | /* Check the buffer writability before any tape movement. Don't alter |
2080 | buffer data. */ |
2081 | if (copy_from_user(&i, buf, 1) != 0 || |
2082 | copy_to_user(buf, &i, 1) != 0 || |
2083 | copy_from_user(&i, buf + count - 1, 1) != 0 || |
2084 | copy_to_user(buf + count - 1, &i, 1) != 0) { |
2085 | retval = (-EFAULT); |
2086 | goto out; |
2087 | } |
2088 | } |
2089 | |
2090 | STps->rw = ST_READING; |
2091 | |
2092 | |
2093 | /* Loop until enough data in buffer or a special condition found */ |
2094 | for (total = 0, special = 0; total < count && !special;) { |
2095 | |
2096 | /* Get new data if the buffer is empty */ |
2097 | if (STbp->buffer_bytes == 0) { |
2098 | special = read_tape(STp, count - total, &SRpnt); |
2099 | if (special < 0) { /* No need to continue read */ |
2100 | retval = special; |
2101 | goto out; |
2102 | } |
2103 | } |
2104 | |
2105 | /* Move the data from driver buffer to user buffer */ |
2106 | if (STbp->buffer_bytes > 0) { |
2107 | DEB( |
2108 | if (debugging && STps->eof != ST_NOEOF) |
2109 | printk(ST_DEB_MSG |
2110 | "%s: EOF up (%d). Left %d, needed %d.\n", name, |
2111 | STps->eof, STbp->buffer_bytes, |
2112 | (int)(count - total)); |
2113 | ) /* end DEB */ |
2114 | transfer = STbp->buffer_bytes < count - total ? |
2115 | STbp->buffer_bytes : count - total; |
2116 | if (!do_dio) { |
2117 | i = from_buffer(STbp, buf, transfer); |
2118 | if (i) { |
2119 | retval = i; |
2120 | goto out; |
2121 | } |
2122 | } |
2123 | buf += transfer; |
2124 | total += transfer; |
2125 | } |
2126 | |
2127 | if (STp->block_size == 0) |
2128 | break; /* Read only one variable length block */ |
2129 | |
2130 | } /* for (total = 0, special = 0; |
2131 | total < count && !special; ) */ |
2132 | |
2133 | /* Change the eof state if no data from tape or buffer */ |
2134 | if (total == 0) { |
2135 | if (STps->eof == ST_FM_HIT) { |
2136 | STps->eof = ST_FM; |
2137 | STps->drv_block = 0; |
2138 | if (STps->drv_file >= 0) |
2139 | STps->drv_file++; |
2140 | } else if (STps->eof == ST_EOD_1) { |
2141 | STps->eof = ST_EOD_2; |
2142 | STps->drv_block = 0; |
2143 | if (STps->drv_file >= 0) |
2144 | STps->drv_file++; |
2145 | } else if (STps->eof == ST_EOD_2) |
2146 | STps->eof = ST_EOD; |
2147 | } else if (STps->eof == ST_FM) |
2148 | STps->eof = ST_NOEOF; |
2149 | retval = total; |
2150 | |
2151 | out: |
2152 | if (SRpnt != NULL) { |
2153 | st_release_request(SRpnt); |
2154 | SRpnt = NULL; |
2155 | } |
2156 | if (do_dio) { |
2157 | release_buffering(STp, 1); |
2158 | STbp->buffer_bytes = 0; |
2159 | } |
2160 | mutex_unlock(&STp->lock); |
2161 | |
2162 | return retval; |
2163 | } |
2164 | |
2165 | |
2166 | |
2167 | DEB( |
2168 | /* Set the driver options */ |
2169 | static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm, char *name) |
2170 | { |
2171 | if (debugging) { |
2172 | printk(KERN_INFO |
2173 | "%s: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n", |
2174 | name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes, |
2175 | STm->do_read_ahead); |
2176 | printk(KERN_INFO |
2177 | "%s: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n", |
2178 | name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock); |
2179 | printk(KERN_INFO |
2180 | "%s: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n", |
2181 | name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions, |
2182 | STp->scsi2_logical); |
2183 | printk(KERN_INFO |
2184 | "%s: sysv: %d nowait: %d sili: %d nowait_filemark: %d\n", |
2185 | name, STm->sysv, STp->immediate, STp->sili, |
2186 | STp->immediate_filemark); |
2187 | printk(KERN_INFO "%s: debugging: %d\n", |
2188 | name, debugging); |
2189 | } |
2190 | } |
2191 | ) |
2192 | |
2193 | |
2194 | static int st_set_options(struct scsi_tape *STp, long options) |
2195 | { |
2196 | int value; |
2197 | long code; |
2198 | struct st_modedef *STm; |
2199 | char *name = tape_name(STp); |
2200 | struct cdev *cd0, *cd1; |
2201 | |
2202 | STm = &(STp->modes[STp->current_mode]); |
2203 | if (!STm->defined) { |
2204 | cd0 = STm->cdevs[0]; cd1 = STm->cdevs[1]; |
2205 | memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); |
2206 | STm->cdevs[0] = cd0; STm->cdevs[1] = cd1; |
2207 | modes_defined = 1; |
2208 | DEBC(printk(ST_DEB_MSG |
2209 | "%s: Initialized mode %d definition from mode 0\n", |
2210 | name, STp->current_mode)); |
2211 | } |
2212 | |
2213 | code = options & MT_ST_OPTIONS; |
2214 | if (code == MT_ST_BOOLEANS) { |
2215 | STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; |
2216 | STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; |
2217 | STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; |
2218 | STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; |
2219 | STp->two_fm = (options & MT_ST_TWO_FM) != 0; |
2220 | STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; |
2221 | STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; |
2222 | STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; |
2223 | STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; |
2224 | if ((STp->device)->scsi_level >= SCSI_2) |
2225 | STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; |
2226 | STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; |
2227 | STp->immediate = (options & MT_ST_NOWAIT) != 0; |
2228 | STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0; |
2229 | STm->sysv = (options & MT_ST_SYSV) != 0; |
2230 | STp->sili = (options & MT_ST_SILI) != 0; |
2231 | DEB( debugging = (options & MT_ST_DEBUGGING) != 0; |
2232 | st_log_options(STp, STm, name); ) |
2233 | } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { |
2234 | value = (code == MT_ST_SETBOOLEANS); |
2235 | if ((options & MT_ST_BUFFER_WRITES) != 0) |
2236 | STm->do_buffer_writes = value; |
2237 | if ((options & MT_ST_ASYNC_WRITES) != 0) |
2238 | STm->do_async_writes = value; |
2239 | if ((options & MT_ST_DEF_WRITES) != 0) |
2240 | STm->defaults_for_writes = value; |
2241 | if ((options & MT_ST_READ_AHEAD) != 0) |
2242 | STm->do_read_ahead = value; |
2243 | if ((options & MT_ST_TWO_FM) != 0) |
2244 | STp->two_fm = value; |
2245 | if ((options & MT_ST_FAST_MTEOM) != 0) |
2246 | STp->fast_mteom = value; |
2247 | if ((options & MT_ST_AUTO_LOCK) != 0) |
2248 | STp->do_auto_lock = value; |
2249 | if ((options & MT_ST_CAN_BSR) != 0) |
2250 | STp->can_bsr = value; |
2251 | if ((options & MT_ST_NO_BLKLIMS) != 0) |
2252 | STp->omit_blklims = value; |
2253 | if ((STp->device)->scsi_level >= SCSI_2 && |
2254 | (options & MT_ST_CAN_PARTITIONS) != 0) |
2255 | STp->can_partitions = value; |
2256 | if ((options & MT_ST_SCSI2LOGICAL) != 0) |
2257 | STp->scsi2_logical = value; |
2258 | if ((options & MT_ST_NOWAIT) != 0) |
2259 | STp->immediate = value; |
2260 | if ((options & MT_ST_NOWAIT_EOF) != 0) |
2261 | STp->immediate_filemark = value; |
2262 | if ((options & MT_ST_SYSV) != 0) |
2263 | STm->sysv = value; |
2264 | if ((options & MT_ST_SILI) != 0) |
2265 | STp->sili = value; |
2266 | DEB( |
2267 | if ((options & MT_ST_DEBUGGING) != 0) |
2268 | debugging = value; |
2269 | st_log_options(STp, STm, name); ) |
2270 | } else if (code == MT_ST_WRITE_THRESHOLD) { |
2271 | /* Retained for compatibility */ |
2272 | } else if (code == MT_ST_DEF_BLKSIZE) { |
2273 | value = (options & ~MT_ST_OPTIONS); |
2274 | if (value == ~MT_ST_OPTIONS) { |
2275 | STm->default_blksize = (-1); |
2276 | DEBC( printk(KERN_INFO "%s: Default block size disabled.\n", name)); |
2277 | } else { |
2278 | STm->default_blksize = value; |
2279 | DEBC( printk(KERN_INFO "%s: Default block size set to %d bytes.\n", |
2280 | name, STm->default_blksize)); |
2281 | if (STp->ready == ST_READY) { |
2282 | STp->blksize_changed = 0; |
2283 | set_mode_densblk(STp, STm); |
2284 | } |
2285 | } |
2286 | } else if (code == MT_ST_TIMEOUTS) { |
2287 | value = (options & ~MT_ST_OPTIONS); |
2288 | if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { |
2289 | STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; |
2290 | DEBC( printk(KERN_INFO "%s: Long timeout set to %d seconds.\n", name, |
2291 | (value & ~MT_ST_SET_LONG_TIMEOUT))); |
2292 | } else { |
2293 | blk_queue_rq_timeout(STp->device->request_queue, |
2294 | value * HZ); |
2295 | DEBC( printk(KERN_INFO "%s: Normal timeout set to %d seconds.\n", |
2296 | name, value) ); |
2297 | } |
2298 | } else if (code == MT_ST_SET_CLN) { |
2299 | value = (options & ~MT_ST_OPTIONS) & 0xff; |
2300 | if (value != 0 && |
2301 | (value < EXTENDED_SENSE_START || |
2302 | value >= SCSI_SENSE_BUFFERSIZE)) |
2303 | return (-EINVAL); |
2304 | STp->cln_mode = value; |
2305 | STp->cln_sense_mask = (options >> 8) & 0xff; |
2306 | STp->cln_sense_value = (options >> 16) & 0xff; |
2307 | printk(KERN_INFO |
2308 | "%s: Cleaning request mode %d, mask %02x, value %02x\n", |
2309 | name, value, STp->cln_sense_mask, STp->cln_sense_value); |
2310 | } else if (code == MT_ST_DEF_OPTIONS) { |
2311 | code = (options & ~MT_ST_CLEAR_DEFAULT); |
2312 | value = (options & MT_ST_CLEAR_DEFAULT); |
2313 | if (code == MT_ST_DEF_DENSITY) { |
2314 | if (value == MT_ST_CLEAR_DEFAULT) { |
2315 | STm->default_density = (-1); |
2316 | DEBC( printk(KERN_INFO "%s: Density default disabled.\n", |
2317 | name)); |
2318 | } else { |
2319 | STm->default_density = value & 0xff; |
2320 | DEBC( printk(KERN_INFO "%s: Density default set to %x\n", |
2321 | name, STm->default_density)); |
2322 | if (STp->ready == ST_READY) { |
2323 | STp->density_changed = 0; |
2324 | set_mode_densblk(STp, STm); |
2325 | } |
2326 | } |
2327 | } else if (code == MT_ST_DEF_DRVBUFFER) { |
2328 | if (value == MT_ST_CLEAR_DEFAULT) { |
2329 | STp->default_drvbuffer = 0xff; |
2330 | DEBC( printk(KERN_INFO |
2331 | "%s: Drive buffer default disabled.\n", name)); |
2332 | } else { |
2333 | STp->default_drvbuffer = value & 7; |
2334 | DEBC( printk(KERN_INFO |
2335 | "%s: Drive buffer default set to %x\n", |
2336 | name, STp->default_drvbuffer)); |
2337 | if (STp->ready == ST_READY) |
2338 | st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer); |
2339 | } |
2340 | } else if (code == MT_ST_DEF_COMPRESSION) { |
2341 | if (value == MT_ST_CLEAR_DEFAULT) { |
2342 | STm->default_compression = ST_DONT_TOUCH; |
2343 | DEBC( printk(KERN_INFO |
2344 | "%s: Compression default disabled.\n", name)); |
2345 | } else { |
2346 | if ((value & 0xff00) != 0) { |
2347 | STp->c_algo = (value & 0xff00) >> 8; |
2348 | DEBC( printk(KERN_INFO "%s: Compression algorithm set to 0x%x.\n", |
2349 | name, STp->c_algo)); |
2350 | } |
2351 | if ((value & 0xff) != 0xff) { |
2352 | STm->default_compression = (value & 1 ? ST_YES : ST_NO); |
2353 | DEBC( printk(KERN_INFO "%s: Compression default set to %x\n", |
2354 | name, (value & 1))); |
2355 | if (STp->ready == ST_READY) { |
2356 | STp->compression_changed = 0; |
2357 | st_compression(STp, (STm->default_compression == ST_YES)); |
2358 | } |
2359 | } |
2360 | } |
2361 | } |
2362 | } else |
2363 | return (-EIO); |
2364 | |
2365 | return 0; |
2366 | } |
2367 | |
2368 | #define MODE_HEADER_LENGTH 4 |
2369 | |
2370 | /* Mode header and page byte offsets */ |
2371 | #define MH_OFF_DATA_LENGTH 0 |
2372 | #define MH_OFF_MEDIUM_TYPE 1 |
2373 | #define MH_OFF_DEV_SPECIFIC 2 |
2374 | #define MH_OFF_BDESCS_LENGTH 3 |
2375 | #define MP_OFF_PAGE_NBR 0 |
2376 | #define MP_OFF_PAGE_LENGTH 1 |
2377 | |
2378 | /* Mode header and page bit masks */ |
2379 | #define MH_BIT_WP 0x80 |
2380 | #define MP_MSK_PAGE_NBR 0x3f |
2381 | |
2382 | /* Don't return block descriptors */ |
2383 | #define MODE_SENSE_OMIT_BDESCS 0x08 |
2384 | |
2385 | #define MODE_SELECT_PAGE_FORMAT 0x10 |
2386 | |
2387 | /* Read a mode page into the tape buffer. The block descriptors are included |
2388 | if incl_block_descs is true. The page control is ored to the page number |
2389 | parameter, if necessary. */ |
2390 | static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) |
2391 | { |
2392 | unsigned char cmd[MAX_COMMAND_SIZE]; |
2393 | struct st_request *SRpnt; |
2394 | |
2395 | memset(cmd, 0, MAX_COMMAND_SIZE); |
2396 | cmd[0] = MODE_SENSE; |
2397 | if (omit_block_descs) |
2398 | cmd[1] = MODE_SENSE_OMIT_BDESCS; |
2399 | cmd[2] = page; |
2400 | cmd[4] = 255; |
2401 | |
2402 | SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE, |
2403 | STp->device->request_queue->rq_timeout, 0, 1); |
2404 | if (SRpnt == NULL) |
2405 | return (STp->buffer)->syscall_result; |
2406 | |
2407 | st_release_request(SRpnt); |
2408 | |
2409 | return STp->buffer->syscall_result; |
2410 | } |
2411 | |
2412 | |
2413 | /* Send the mode page in the tape buffer to the drive. Assumes that the mode data |
2414 | in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ |
2415 | static int write_mode_page(struct scsi_tape *STp, int page, int slow) |
2416 | { |
2417 | int pgo; |
2418 | unsigned char cmd[MAX_COMMAND_SIZE]; |
2419 | struct st_request *SRpnt; |
2420 | int timeout; |
2421 | |
2422 | memset(cmd, 0, MAX_COMMAND_SIZE); |
2423 | cmd[0] = MODE_SELECT; |
2424 | cmd[1] = MODE_SELECT_PAGE_FORMAT; |
2425 | pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH]; |
2426 | cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2; |
2427 | |
2428 | /* Clear reserved fields */ |
2429 | (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0; |
2430 | (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0; |
2431 | (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; |
2432 | (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; |
2433 | |
2434 | timeout = slow ? |
2435 | STp->long_timeout : STp->device->request_queue->rq_timeout; |
2436 | SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE, |
2437 | timeout, 0, 1); |
2438 | if (SRpnt == NULL) |
2439 | return (STp->buffer)->syscall_result; |
2440 | |
2441 | st_release_request(SRpnt); |
2442 | |
2443 | return STp->buffer->syscall_result; |
2444 | } |
2445 | |
2446 | |
2447 | #define COMPRESSION_PAGE 0x0f |
2448 | #define COMPRESSION_PAGE_LENGTH 16 |
2449 | |
2450 | #define CP_OFF_DCE_DCC 2 |
2451 | #define CP_OFF_C_ALGO 7 |
2452 | |
2453 | #define DCE_MASK 0x80 |
2454 | #define DCC_MASK 0x40 |
2455 | #define RED_MASK 0x60 |
2456 | |
2457 | |
2458 | /* Control the compression with mode page 15. Algorithm not changed if zero. |
2459 | |
2460 | The block descriptors are read and written because Sony SDT-7000 does not |
2461 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). |
2462 | Including block descriptors should not cause any harm to other drives. */ |
2463 | |
2464 | static int st_compression(struct scsi_tape * STp, int state) |
2465 | { |
2466 | int retval; |
2467 | int mpoffs; /* Offset to mode page start */ |
2468 | unsigned char *b_data = (STp->buffer)->b_data; |
2469 | DEB( char *name = tape_name(STp); ) |
2470 | |
2471 | if (STp->ready != ST_READY) |
2472 | return (-EIO); |
2473 | |
2474 | /* Read the current page contents */ |
2475 | retval = read_mode_page(STp, COMPRESSION_PAGE, 0); |
2476 | if (retval) { |
2477 | DEBC(printk(ST_DEB_MSG "%s: Compression mode page not supported.\n", |
2478 | name)); |
2479 | return (-EIO); |
2480 | } |
2481 | |
2482 | mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; |
2483 | DEBC(printk(ST_DEB_MSG "%s: Compression state is %d.\n", name, |
2484 | (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0))); |
2485 | |
2486 | /* Check if compression can be changed */ |
2487 | if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) { |
2488 | DEBC(printk(ST_DEB_MSG "%s: Compression not supported.\n", name)); |
2489 | return (-EIO); |
2490 | } |
2491 | |
2492 | /* Do the change */ |
2493 | if (state) { |
2494 | b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK; |
2495 | if (STp->c_algo != 0) |
2496 | b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo; |
2497 | } |
2498 | else { |
2499 | b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK; |
2500 | if (STp->c_algo != 0) |
2501 | b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */ |
2502 | } |
2503 | |
2504 | retval = write_mode_page(STp, COMPRESSION_PAGE, 0); |
2505 | if (retval) { |
2506 | DEBC(printk(ST_DEB_MSG "%s: Compression change failed.\n", name)); |
2507 | return (-EIO); |
2508 | } |
2509 | DEBC(printk(ST_DEB_MSG "%s: Compression state changed to %d.\n", |
2510 | name, state)); |
2511 | |
2512 | STp->compression_changed = 1; |
2513 | return 0; |
2514 | } |
2515 | |
2516 | |
2517 | /* Process the load and unload commands (does unload if the load code is zero) */ |
2518 | static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code) |
2519 | { |
2520 | int retval = (-EIO), timeout; |
2521 | DEB( char *name = tape_name(STp); ) |
2522 | unsigned char cmd[MAX_COMMAND_SIZE]; |
2523 | struct st_partstat *STps; |
2524 | struct st_request *SRpnt; |
2525 | |
2526 | if (STp->ready != ST_READY && !load_code) { |
2527 | if (STp->ready == ST_NO_TAPE) |
2528 | return (-ENOMEDIUM); |
2529 | else |
2530 | return (-EIO); |
2531 | } |
2532 | |
2533 | memset(cmd, 0, MAX_COMMAND_SIZE); |
2534 | cmd[0] = START_STOP; |
2535 | if (load_code) |
2536 | cmd[4] |= 1; |
2537 | /* |
2538 | * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A |
2539 | */ |
2540 | if (load_code >= 1 + MT_ST_HPLOADER_OFFSET |
2541 | && load_code <= 6 + MT_ST_HPLOADER_OFFSET) { |
2542 | DEBC(printk(ST_DEB_MSG "%s: Enhanced %sload slot %2d.\n", |
2543 | name, (cmd[4]) ? "" : "un", |
2544 | load_code - MT_ST_HPLOADER_OFFSET)); |
2545 | cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ |
2546 | } |
2547 | if (STp->immediate) { |
2548 | cmd[1] = 1; /* Don't wait for completion */ |
2549 | timeout = STp->device->request_queue->rq_timeout; |
2550 | } |
2551 | else |
2552 | timeout = STp->long_timeout; |
2553 | |
2554 | DEBC( |
2555 | if (!load_code) |
2556 | printk(ST_DEB_MSG "%s: Unloading tape.\n", name); |
2557 | else |
2558 | printk(ST_DEB_MSG "%s: Loading tape.\n", name); |
2559 | ); |
2560 | |
2561 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
2562 | timeout, MAX_RETRIES, 1); |
2563 | if (!SRpnt) |
2564 | return (STp->buffer)->syscall_result; |
2565 | |
2566 | retval = (STp->buffer)->syscall_result; |
2567 | st_release_request(SRpnt); |
2568 | |
2569 | if (!retval) { /* SCSI command successful */ |
2570 | |
2571 | if (!load_code) { |
2572 | STp->rew_at_close = 0; |
2573 | STp->ready = ST_NO_TAPE; |
2574 | } |
2575 | else { |
2576 | STp->rew_at_close = STp->autorew_dev; |
2577 | retval = check_tape(STp, filp); |
2578 | if (retval > 0) |
2579 | retval = 0; |
2580 | } |
2581 | } |
2582 | else { |
2583 | STps = &(STp->ps[STp->partition]); |
2584 | STps->drv_file = STps->drv_block = (-1); |
2585 | } |
2586 | |
2587 | return retval; |
2588 | } |
2589 | |
2590 | #if DEBUG |
2591 | #define ST_DEB_FORWARD 0 |
2592 | #define ST_DEB_BACKWARD 1 |
2593 | static void deb_space_print(char *name, int direction, char *units, unsigned char *cmd) |
2594 | { |
2595 | s32 sc; |
2596 | |
2597 | sc = cmd[2] & 0x80 ? 0xff000000 : 0; |
2598 | sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; |
2599 | if (direction) |
2600 | sc = -sc; |
2601 | printk(ST_DEB_MSG "%s: Spacing tape %s over %d %s.\n", name, |
2602 | direction ? "backward" : "forward", sc, units); |
2603 | } |
2604 | #endif |
2605 | |
2606 | |
2607 | /* Internal ioctl function */ |
2608 | static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) |
2609 | { |
2610 | int timeout; |
2611 | long ltmp; |
2612 | int ioctl_result; |
2613 | int chg_eof = 1; |
2614 | unsigned char cmd[MAX_COMMAND_SIZE]; |
2615 | struct st_request *SRpnt; |
2616 | struct st_partstat *STps; |
2617 | int fileno, blkno, at_sm, undone; |
2618 | int datalen = 0, direction = DMA_NONE; |
2619 | char *name = tape_name(STp); |
2620 | |
2621 | WARN_ON(STp->buffer->do_dio != 0); |
2622 | if (STp->ready != ST_READY) { |
2623 | if (STp->ready == ST_NO_TAPE) |
2624 | return (-ENOMEDIUM); |
2625 | else |
2626 | return (-EIO); |
2627 | } |
2628 | timeout = STp->long_timeout; |
2629 | STps = &(STp->ps[STp->partition]); |
2630 | fileno = STps->drv_file; |
2631 | blkno = STps->drv_block; |
2632 | at_sm = STps->at_sm; |
2633 | |
2634 | memset(cmd, 0, MAX_COMMAND_SIZE); |
2635 | switch (cmd_in) { |
2636 | case MTFSFM: |
2637 | chg_eof = 0; /* Changed from the FSF after this */ |
2638 | case MTFSF: |
2639 | cmd[0] = SPACE; |
2640 | cmd[1] = 0x01; /* Space FileMarks */ |
2641 | cmd[2] = (arg >> 16); |
2642 | cmd[3] = (arg >> 8); |
2643 | cmd[4] = arg; |
2644 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "filemarks", cmd);) |
2645 | if (fileno >= 0) |
2646 | fileno += arg; |
2647 | blkno = 0; |
2648 | at_sm &= (arg == 0); |
2649 | break; |
2650 | case MTBSFM: |
2651 | chg_eof = 0; /* Changed from the FSF after this */ |
2652 | case MTBSF: |
2653 | cmd[0] = SPACE; |
2654 | cmd[1] = 0x01; /* Space FileMarks */ |
2655 | ltmp = (-arg); |
2656 | cmd[2] = (ltmp >> 16); |
2657 | cmd[3] = (ltmp >> 8); |
2658 | cmd[4] = ltmp; |
2659 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "filemarks", cmd);) |
2660 | if (fileno >= 0) |
2661 | fileno -= arg; |
2662 | blkno = (-1); /* We can't know the block number */ |
2663 | at_sm &= (arg == 0); |
2664 | break; |
2665 | case MTFSR: |
2666 | cmd[0] = SPACE; |
2667 | cmd[1] = 0x00; /* Space Blocks */ |
2668 | cmd[2] = (arg >> 16); |
2669 | cmd[3] = (arg >> 8); |
2670 | cmd[4] = arg; |
2671 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "blocks", cmd);) |
2672 | if (blkno >= 0) |
2673 | blkno += arg; |
2674 | at_sm &= (arg == 0); |
2675 | break; |
2676 | case MTBSR: |
2677 | cmd[0] = SPACE; |
2678 | cmd[1] = 0x00; /* Space Blocks */ |
2679 | ltmp = (-arg); |
2680 | cmd[2] = (ltmp >> 16); |
2681 | cmd[3] = (ltmp >> 8); |
2682 | cmd[4] = ltmp; |
2683 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "blocks", cmd);) |
2684 | if (blkno >= 0) |
2685 | blkno -= arg; |
2686 | at_sm &= (arg == 0); |
2687 | break; |
2688 | case MTFSS: |
2689 | cmd[0] = SPACE; |
2690 | cmd[1] = 0x04; /* Space Setmarks */ |
2691 | cmd[2] = (arg >> 16); |
2692 | cmd[3] = (arg >> 8); |
2693 | cmd[4] = arg; |
2694 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "setmarks", cmd);) |
2695 | if (arg != 0) { |
2696 | blkno = fileno = (-1); |
2697 | at_sm = 1; |
2698 | } |
2699 | break; |
2700 | case MTBSS: |
2701 | cmd[0] = SPACE; |
2702 | cmd[1] = 0x04; /* Space Setmarks */ |
2703 | ltmp = (-arg); |
2704 | cmd[2] = (ltmp >> 16); |
2705 | cmd[3] = (ltmp >> 8); |
2706 | cmd[4] = ltmp; |
2707 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "setmarks", cmd);) |
2708 | if (arg != 0) { |
2709 | blkno = fileno = (-1); |
2710 | at_sm = 1; |
2711 | } |
2712 | break; |
2713 | case MTWEOF: |
2714 | case MTWEOFI: |
2715 | case MTWSM: |
2716 | if (STp->write_prot) |
2717 | return (-EACCES); |
2718 | cmd[0] = WRITE_FILEMARKS; |
2719 | if (cmd_in == MTWSM) |
2720 | cmd[1] = 2; |
2721 | if (cmd_in == MTWEOFI || |
2722 | (cmd_in == MTWEOF && STp->immediate_filemark)) |
2723 | cmd[1] |= 1; |
2724 | cmd[2] = (arg >> 16); |
2725 | cmd[3] = (arg >> 8); |
2726 | cmd[4] = arg; |
2727 | timeout = STp->device->request_queue->rq_timeout; |
2728 | DEBC( |
2729 | if (cmd_in != MTWSM) |
2730 | printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name, |
2731 | cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); |
2732 | else |
2733 | printk(ST_DEB_MSG "%s: Writing %d setmarks.\n", name, |
2734 | cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); |
2735 | ) |
2736 | if (fileno >= 0) |
2737 | fileno += arg; |
2738 | blkno = 0; |
2739 | at_sm = (cmd_in == MTWSM); |
2740 | break; |
2741 | case MTREW: |
2742 | cmd[0] = REZERO_UNIT; |
2743 | if (STp->immediate) { |
2744 | cmd[1] = 1; /* Don't wait for completion */ |
2745 | timeout = STp->device->request_queue->rq_timeout; |
2746 | } |
2747 | DEBC(printk(ST_DEB_MSG "%s: Rewinding tape.\n", name)); |
2748 | fileno = blkno = at_sm = 0; |
2749 | break; |
2750 | case MTNOP: |
2751 | DEBC(printk(ST_DEB_MSG "%s: No op on tape.\n", name)); |
2752 | return 0; /* Should do something ? */ |
2753 | break; |
2754 | case MTRETEN: |
2755 | cmd[0] = START_STOP; |
2756 | if (STp->immediate) { |
2757 | cmd[1] = 1; /* Don't wait for completion */ |
2758 | timeout = STp->device->request_queue->rq_timeout; |
2759 | } |
2760 | cmd[4] = 3; |
2761 | DEBC(printk(ST_DEB_MSG "%s: Retensioning tape.\n", name)); |
2762 | fileno = blkno = at_sm = 0; |
2763 | break; |
2764 | case MTEOM: |
2765 | if (!STp->fast_mteom) { |
2766 | /* space to the end of tape */ |
2767 | ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); |
2768 | fileno = STps->drv_file; |
2769 | if (STps->eof >= ST_EOD_1) |
2770 | return 0; |
2771 | /* The next lines would hide the number of spaced FileMarks |
2772 | That's why I inserted the previous lines. I had no luck |
2773 | with detecting EOM with FSF, so we go now to EOM. |
2774 | Joerg Weule */ |
2775 | } else |
2776 | fileno = (-1); |
2777 | cmd[0] = SPACE; |
2778 | cmd[1] = 3; |
2779 | DEBC(printk(ST_DEB_MSG "%s: Spacing to end of recorded medium.\n", |
2780 | name)); |
2781 | blkno = -1; |
2782 | at_sm = 0; |
2783 | break; |
2784 | case MTERASE: |
2785 | if (STp->write_prot) |
2786 | return (-EACCES); |
2787 | cmd[0] = ERASE; |
2788 | cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ |
2789 | if (STp->immediate) { |
2790 | cmd[1] |= 2; /* Don't wait for completion */ |
2791 | timeout = STp->device->request_queue->rq_timeout; |
2792 | } |
2793 | else |
2794 | timeout = STp->long_timeout * 8; |
2795 | |
2796 | DEBC(printk(ST_DEB_MSG "%s: Erasing tape.\n", name)); |
2797 | fileno = blkno = at_sm = 0; |
2798 | break; |
2799 | case MTSETBLK: /* Set block length */ |
2800 | case MTSETDENSITY: /* Set tape density */ |
2801 | case MTSETDRVBUFFER: /* Set drive buffering */ |
2802 | case SET_DENS_AND_BLK: /* Set density and block size */ |
2803 | chg_eof = 0; |
2804 | if (STp->dirty || (STp->buffer)->buffer_bytes != 0) |
2805 | return (-EIO); /* Not allowed if data in buffer */ |
2806 | if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && |
2807 | (arg & MT_ST_BLKSIZE_MASK) != 0 && |
2808 | STp->max_block > 0 && |
2809 | ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || |
2810 | (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { |
2811 | printk(KERN_WARNING "%s: Illegal block size.\n", name); |
2812 | return (-EINVAL); |
2813 | } |
2814 | cmd[0] = MODE_SELECT; |
2815 | if ((STp->use_pf & USE_PF)) |
2816 | cmd[1] = MODE_SELECT_PAGE_FORMAT; |
2817 | cmd[4] = datalen = 12; |
2818 | direction = DMA_TO_DEVICE; |
2819 | |
2820 | memset((STp->buffer)->b_data, 0, 12); |
2821 | if (cmd_in == MTSETDRVBUFFER) |
2822 | (STp->buffer)->b_data[2] = (arg & 7) << 4; |
2823 | else |
2824 | (STp->buffer)->b_data[2] = |
2825 | STp->drv_buffer << 4; |
2826 | (STp->buffer)->b_data[3] = 8; /* block descriptor length */ |
2827 | if (cmd_in == MTSETDENSITY) { |
2828 | (STp->buffer)->b_data[4] = arg; |
2829 | STp->density_changed = 1; /* At least we tried ;-) */ |
2830 | } else if (cmd_in == SET_DENS_AND_BLK) |
2831 | (STp->buffer)->b_data[4] = arg >> 24; |
2832 | else |
2833 | (STp->buffer)->b_data[4] = STp->density; |
2834 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { |
2835 | ltmp = arg & MT_ST_BLKSIZE_MASK; |
2836 | if (cmd_in == MTSETBLK) |
2837 | STp->blksize_changed = 1; /* At least we tried ;-) */ |
2838 | } else |
2839 | ltmp = STp->block_size; |
2840 | (STp->buffer)->b_data[9] = (ltmp >> 16); |
2841 | (STp->buffer)->b_data[10] = (ltmp >> 8); |
2842 | (STp->buffer)->b_data[11] = ltmp; |
2843 | timeout = STp->device->request_queue->rq_timeout; |
2844 | DEBC( |
2845 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) |
2846 | printk(ST_DEB_MSG |
2847 | "%s: Setting block size to %d bytes.\n", name, |
2848 | (STp->buffer)->b_data[9] * 65536 + |
2849 | (STp->buffer)->b_data[10] * 256 + |
2850 | (STp->buffer)->b_data[11]); |
2851 | if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) |
2852 | printk(ST_DEB_MSG |
2853 | "%s: Setting density code to %x.\n", name, |
2854 | (STp->buffer)->b_data[4]); |
2855 | if (cmd_in == MTSETDRVBUFFER) |
2856 | printk(ST_DEB_MSG |
2857 | "%s: Setting drive buffer code to %d.\n", name, |
2858 | ((STp->buffer)->b_data[2] >> 4) & 7); |
2859 | ) |
2860 | break; |
2861 | default: |
2862 | return (-ENOSYS); |
2863 | } |
2864 | |
2865 | SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, |
2866 | timeout, MAX_RETRIES, 1); |
2867 | if (!SRpnt) |
2868 | return (STp->buffer)->syscall_result; |
2869 | |
2870 | ioctl_result = (STp->buffer)->syscall_result; |
2871 | |
2872 | if (!ioctl_result) { /* SCSI command successful */ |
2873 | st_release_request(SRpnt); |
2874 | SRpnt = NULL; |
2875 | STps->drv_block = blkno; |
2876 | STps->drv_file = fileno; |
2877 | STps->at_sm = at_sm; |
2878 | |
2879 | if (cmd_in == MTBSFM) |
2880 | ioctl_result = st_int_ioctl(STp, MTFSF, 1); |
2881 | else if (cmd_in == MTFSFM) |
2882 | ioctl_result = st_int_ioctl(STp, MTBSF, 1); |
2883 | |
2884 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { |
2885 | STp->block_size = arg & MT_ST_BLKSIZE_MASK; |
2886 | if (STp->block_size != 0) { |
2887 | (STp->buffer)->buffer_blocks = |
2888 | (STp->buffer)->buffer_size / STp->block_size; |
2889 | } |
2890 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; |
2891 | if (cmd_in == SET_DENS_AND_BLK) |
2892 | STp->density = arg >> MT_ST_DENSITY_SHIFT; |
2893 | } else if (cmd_in == MTSETDRVBUFFER) |
2894 | STp->drv_buffer = (arg & 7); |
2895 | else if (cmd_in == MTSETDENSITY) |
2896 | STp->density = arg; |
2897 | |
2898 | if (cmd_in == MTEOM) |
2899 | STps->eof = ST_EOD; |
2900 | else if (cmd_in == MTFSF) |
2901 | STps->eof = ST_FM; |
2902 | else if (chg_eof) |
2903 | STps->eof = ST_NOEOF; |
2904 | |
2905 | if (cmd_in == MTWEOF || cmd_in == MTWEOFI) |
2906 | STps->rw = ST_IDLE; /* prevent automatic WEOF at close */ |
2907 | } else { /* SCSI command was not completely successful. Don't return |
2908 | from this block without releasing the SCSI command block! */ |
2909 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; |
2910 | |
2911 | if (cmdstatp->flags & SENSE_EOM) { |
2912 | if (cmd_in != MTBSF && cmd_in != MTBSFM && |
2913 | cmd_in != MTBSR && cmd_in != MTBSS) |
2914 | STps->eof = ST_EOM_OK; |
2915 | STps->drv_block = 0; |
2916 | } |
2917 | |
2918 | if (cmdstatp->remainder_valid) |
2919 | undone = (int)cmdstatp->uremainder64; |
2920 | else |
2921 | undone = 0; |
2922 | |
2923 | if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) && |
2924 | cmdstatp->have_sense && |
2925 | (cmdstatp->flags & SENSE_EOM)) { |
2926 | if (cmdstatp->sense_hdr.sense_key == NO_SENSE || |
2927 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { |
2928 | ioctl_result = 0; /* EOF(s) written successfully at EOM */ |
2929 | STps->eof = ST_NOEOF; |
2930 | } else { /* Writing EOF(s) failed */ |
2931 | if (fileno >= 0) |
2932 | fileno -= undone; |
2933 | if (undone < arg) |
2934 | STps->eof = ST_NOEOF; |
2935 | } |
2936 | STps->drv_file = fileno; |
2937 | } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { |
2938 | if (fileno >= 0) |
2939 | STps->drv_file = fileno - undone; |
2940 | else |
2941 | STps->drv_file = fileno; |
2942 | STps->drv_block = -1; |
2943 | STps->eof = ST_NOEOF; |
2944 | } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { |
2945 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ |
2946 | undone = (-undone); |
2947 | if (STps->drv_file >= 0) |
2948 | STps->drv_file = fileno + undone; |
2949 | STps->drv_block = 0; |
2950 | STps->eof = ST_NOEOF; |
2951 | } else if (cmd_in == MTFSR) { |
2952 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ |
2953 | if (STps->drv_file >= 0) |
2954 | STps->drv_file++; |
2955 | STps->drv_block = 0; |
2956 | STps->eof = ST_FM; |
2957 | } else { |
2958 | if (blkno >= undone) |
2959 | STps->drv_block = blkno - undone; |
2960 | else |
2961 | STps->drv_block = (-1); |
2962 | STps->eof = ST_NOEOF; |
2963 | } |
2964 | } else if (cmd_in == MTBSR) { |
2965 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ |
2966 | STps->drv_file--; |
2967 | STps->drv_block = (-1); |
2968 | } else { |
2969 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ |
2970 | undone = (-undone); |
2971 | if (STps->drv_block >= 0) |
2972 | STps->drv_block = blkno + undone; |
2973 | } |
2974 | STps->eof = ST_NOEOF; |
2975 | } else if (cmd_in == MTEOM) { |
2976 | STps->drv_file = (-1); |
2977 | STps->drv_block = (-1); |
2978 | STps->eof = ST_EOD; |
2979 | } else if (cmd_in == MTSETBLK || |
2980 | cmd_in == MTSETDENSITY || |
2981 | cmd_in == MTSETDRVBUFFER || |
2982 | cmd_in == SET_DENS_AND_BLK) { |
2983 | if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && |
2984 | !(STp->use_pf & PF_TESTED)) { |
2985 | /* Try the other possible state of Page Format if not |
2986 | already tried */ |
2987 | STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED; |
2988 | st_release_request(SRpnt); |
2989 | SRpnt = NULL; |
2990 | return st_int_ioctl(STp, cmd_in, arg); |
2991 | } |
2992 | } else if (chg_eof) |
2993 | STps->eof = ST_NOEOF; |
2994 | |
2995 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) |
2996 | STps->eof = ST_EOD; |
2997 | |
2998 | st_release_request(SRpnt); |
2999 | SRpnt = NULL; |
3000 | } |
3001 | |
3002 | return ioctl_result; |
3003 | } |
3004 | |
3005 | |
3006 | /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc |
3007 | structure. */ |
3008 | |
3009 | static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, |
3010 | int logical) |
3011 | { |
3012 | int result; |
3013 | unsigned char scmd[MAX_COMMAND_SIZE]; |
3014 | struct st_request *SRpnt; |
3015 | DEB( char *name = tape_name(STp); ) |
3016 | |
3017 | if (STp->ready != ST_READY) |
3018 | return (-EIO); |
3019 | |
3020 | memset(scmd, 0, MAX_COMMAND_SIZE); |
3021 | if ((STp->device)->scsi_level < SCSI_2) { |
3022 | scmd[0] = QFA_REQUEST_BLOCK; |
3023 | scmd[4] = 3; |
3024 | } else { |
3025 | scmd[0] = READ_POSITION; |
3026 | if (!logical && !STp->scsi2_logical) |
3027 | scmd[1] = 1; |
3028 | } |
3029 | SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, |
3030 | STp->device->request_queue->rq_timeout, |
3031 | MAX_READY_RETRIES, 1); |
3032 | if (!SRpnt) |
3033 | return (STp->buffer)->syscall_result; |
3034 | |
3035 | if ((STp->buffer)->syscall_result != 0 || |
3036 | (STp->device->scsi_level >= SCSI_2 && |
3037 | ((STp->buffer)->b_data[0] & 4) != 0)) { |
3038 | *block = *partition = 0; |
3039 | DEBC(printk(ST_DEB_MSG "%s: Can't read tape position.\n", name)); |
3040 | result = (-EIO); |
3041 | } else { |
3042 | result = 0; |
3043 | if ((STp->device)->scsi_level < SCSI_2) { |
3044 | *block = ((STp->buffer)->b_data[0] << 16) |
3045 | + ((STp->buffer)->b_data[1] << 8) |
3046 | + (STp->buffer)->b_data[2]; |
3047 | *partition = 0; |
3048 | } else { |
3049 | *block = ((STp->buffer)->b_data[4] << 24) |
3050 | + ((STp->buffer)->b_data[5] << 16) |
3051 | + ((STp->buffer)->b_data[6] << 8) |
3052 | + (STp->buffer)->b_data[7]; |
3053 | *partition = (STp->buffer)->b_data[1]; |
3054 | if (((STp->buffer)->b_data[0] & 0x80) && |
3055 | (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ |
3056 | STp->ps[0].drv_block = STp->ps[0].drv_file = 0; |
3057 | } |
3058 | DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name, |
3059 | *block, *partition)); |
3060 | } |
3061 | st_release_request(SRpnt); |
3062 | SRpnt = NULL; |
3063 | |
3064 | return result; |
3065 | } |
3066 | |
3067 | |
3068 | /* Set the tape block and partition. Negative partition means that only the |
3069 | block should be set in vendor specific way. */ |
3070 | static int set_location(struct scsi_tape *STp, unsigned int block, int partition, |
3071 | int logical) |
3072 | { |
3073 | struct st_partstat *STps; |
3074 | int result, p; |
3075 | unsigned int blk; |
3076 | int timeout; |
3077 | unsigned char scmd[MAX_COMMAND_SIZE]; |
3078 | struct st_request *SRpnt; |
3079 | DEB( char *name = tape_name(STp); ) |
3080 | |
3081 | if (STp->ready != ST_READY) |
3082 | return (-EIO); |
3083 | timeout = STp->long_timeout; |
3084 | STps = &(STp->ps[STp->partition]); |
3085 | |
3086 | DEBC(printk(ST_DEB_MSG "%s: Setting block to %d and partition to %d.\n", |
3087 | name, block, partition)); |
3088 | DEB(if (partition < 0) |
3089 | return (-EIO); ) |
3090 | |
3091 | /* Update the location at the partition we are leaving */ |
3092 | if ((!STp->can_partitions && partition != 0) || |
3093 | partition >= ST_NBR_PARTITIONS) |
3094 | return (-EINVAL); |
3095 | if (partition != STp->partition) { |
3096 | if (get_location(STp, &blk, &p, 1)) |
3097 | STps->last_block_valid = 0; |
3098 | else { |
3099 | STps->last_block_valid = 1; |
3100 | STps->last_block_visited = blk; |
3101 | DEBC(printk(ST_DEB_MSG |
3102 | "%s: Visited block %d for partition %d saved.\n", |
3103 | name, blk, STp->partition)); |
3104 | } |
3105 | } |
3106 | |
3107 | memset(scmd, 0, MAX_COMMAND_SIZE); |
3108 | if ((STp->device)->scsi_level < SCSI_2) { |
3109 | scmd[0] = QFA_SEEK_BLOCK; |
3110 | scmd[2] = (block >> 16); |
3111 | scmd[3] = (block >> 8); |
3112 | scmd[4] = block; |
3113 | scmd[5] = 0; |
3114 | } else { |
3115 | scmd[0] = SEEK_10; |
3116 | scmd[3] = (block >> 24); |
3117 | scmd[4] = (block >> 16); |
3118 | scmd[5] = (block >> 8); |
3119 | scmd[6] = block; |
3120 | if (!logical && !STp->scsi2_logical) |
3121 | scmd[1] = 4; |
3122 | if (STp->partition != partition) { |
3123 | scmd[1] |= 2; |
3124 | scmd[8] = partition; |
3125 | DEBC(printk(ST_DEB_MSG |
3126 | "%s: Trying to change partition from %d to %d\n", |
3127 | name, STp->partition, partition)); |
3128 | } |
3129 | } |
3130 | if (STp->immediate) { |
3131 | scmd[1] |= 1; /* Don't wait for completion */ |
3132 | timeout = STp->device->request_queue->rq_timeout; |
3133 | } |
3134 | |
3135 | SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, |
3136 | timeout, MAX_READY_RETRIES, 1); |
3137 | if (!SRpnt) |
3138 | return (STp->buffer)->syscall_result; |
3139 | |
3140 | STps->drv_block = STps->drv_file = (-1); |
3141 | STps->eof = ST_NOEOF; |
3142 | if ((STp->buffer)->syscall_result != 0) { |
3143 | result = (-EIO); |
3144 | if (STp->can_partitions && |
3145 | (STp->device)->scsi_level >= SCSI_2 && |
3146 | (p = find_partition(STp)) >= 0) |
3147 | STp->partition = p; |
3148 | } else { |
3149 | if (STp->can_partitions) { |
3150 | STp->partition = partition; |
3151 | STps = &(STp->ps[partition]); |
3152 | if (!STps->last_block_valid || |
3153 | STps->last_block_visited != block) { |
3154 | STps->at_sm = 0; |
3155 | STps->rw = ST_IDLE; |
3156 | } |
3157 | } else |
3158 | STps->at_sm = 0; |
3159 | if (block == 0) |
3160 | STps->drv_block = STps->drv_file = 0; |
3161 | result = 0; |
3162 | } |
3163 | |
3164 | st_release_request(SRpnt); |
3165 | SRpnt = NULL; |
3166 | |
3167 | return result; |
3168 | } |
3169 | |
3170 | |
3171 | /* Find the current partition number for the drive status. Called from open and |
3172 | returns either partition number of negative error code. */ |
3173 | static int find_partition(struct scsi_tape *STp) |
3174 | { |
3175 | int i, partition; |
3176 | unsigned int block; |
3177 | |
3178 | if ((i = get_location(STp, &block, &partition, 1)) < 0) |
3179 | return i; |
3180 | if (partition >= ST_NBR_PARTITIONS) |
3181 | return (-EIO); |
3182 | return partition; |
3183 | } |
3184 | |
3185 | |
3186 | /* Change the partition if necessary */ |
3187 | static int switch_partition(struct scsi_tape *STp) |
3188 | { |
3189 | struct st_partstat *STps; |
3190 | |
3191 | if (STp->partition == STp->new_partition) |
3192 | return 0; |
3193 | STps = &(STp->ps[STp->new_partition]); |
3194 | if (!STps->last_block_valid) |
3195 | STps->last_block_visited = 0; |
3196 | return set_location(STp, STps->last_block_visited, STp->new_partition, 1); |
3197 | } |
3198 | |
3199 | /* Functions for reading and writing the medium partition mode page. */ |
3200 | |
3201 | #define PART_PAGE 0x11 |
3202 | #define PART_PAGE_FIXED_LENGTH 8 |
3203 | |
3204 | #define PP_OFF_MAX_ADD_PARTS 2 |
3205 | #define PP_OFF_NBR_ADD_PARTS 3 |
3206 | #define PP_OFF_FLAGS 4 |
3207 | #define PP_OFF_PART_UNITS 6 |
3208 | #define PP_OFF_RESERVED 7 |
3209 | |
3210 | #define PP_BIT_IDP 0x20 |
3211 | #define PP_MSK_PSUM_MB 0x10 |
3212 | |
3213 | /* Get the number of partitions on the tape. As a side effect reads the |
3214 | mode page into the tape buffer. */ |
3215 | static int nbr_partitions(struct scsi_tape *STp) |
3216 | { |
3217 | int result; |
3218 | DEB( char *name = tape_name(STp); ) |
3219 | |
3220 | if (STp->ready != ST_READY) |
3221 | return (-EIO); |
3222 | |
3223 | result = read_mode_page(STp, PART_PAGE, 1); |
3224 | |
3225 | if (result) { |
3226 | DEBC(printk(ST_DEB_MSG "%s: Can't read medium partition page.\n", |
3227 | name)); |
3228 | result = (-EIO); |
3229 | } else { |
3230 | result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + |
3231 | PP_OFF_NBR_ADD_PARTS] + 1; |
3232 | DEBC(printk(ST_DEB_MSG "%s: Number of partitions %d.\n", name, result)); |
3233 | } |
3234 | |
3235 | return result; |
3236 | } |
3237 | |
3238 | |
3239 | /* Partition the tape into two partitions if size > 0 or one partition if |
3240 | size == 0. |
3241 | |
3242 | The block descriptors are read and written because Sony SDT-7000 does not |
3243 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). |
3244 | |
3245 | My HP C1533A drive returns only one partition size field. This is used to |
3246 | set the size of partition 1. There is no size field for the default partition. |
3247 | Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is |
3248 | used to set the size of partition 1 (this is what the SCSI-3 standard specifies). |
3249 | The following algorithm is used to accommodate both drives: if the number of |
3250 | partition size fields is greater than the maximum number of additional partitions |
3251 | in the mode page, the second field is used. Otherwise the first field is used. |
3252 | |
3253 | For Seagate DDS drives the page length must be 8 when no partitions is defined |
3254 | and 10 when 1 partition is defined (information from Eric Lee Green). This is |
3255 | is acceptable also to some other old drives and enforced if the first partition |
3256 | size field is used for the first additional partition size. |
3257 | */ |
3258 | static int partition_tape(struct scsi_tape *STp, int size) |
3259 | { |
3260 | char *name = tape_name(STp); |
3261 | int result; |
3262 | int pgo, psd_cnt, psdo; |
3263 | unsigned char *bp; |
3264 | |
3265 | result = read_mode_page(STp, PART_PAGE, 0); |
3266 | if (result) { |
3267 | DEBC(printk(ST_DEB_MSG "%s: Can't read partition mode page.\n", name)); |
3268 | return result; |
3269 | } |
3270 | /* The mode page is in the buffer. Let's modify it and write it. */ |
3271 | bp = (STp->buffer)->b_data; |
3272 | pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; |
3273 | DEBC(printk(ST_DEB_MSG "%s: Partition page length is %d bytes.\n", |
3274 | name, bp[pgo + MP_OFF_PAGE_LENGTH] + 2)); |
3275 | |
3276 | psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; |
3277 | psdo = pgo + PART_PAGE_FIXED_LENGTH; |
3278 | if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) { |
3279 | bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */ |
3280 | psdo += 2; |
3281 | } |
3282 | memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); |
3283 | |
3284 | DEBC(printk("%s: psd_cnt %d, max.parts %d, nbr_parts %d\n", name, |
3285 | psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], |
3286 | bp[pgo + PP_OFF_NBR_ADD_PARTS])); |
3287 | |
3288 | if (size <= 0) { |
3289 | bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; |
3290 | if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) |
3291 | bp[pgo + MP_OFF_PAGE_LENGTH] = 6; |
3292 | DEBC(printk(ST_DEB_MSG "%s: Formatting tape with one partition.\n", |
3293 | name)); |
3294 | } else { |
3295 | bp[psdo] = (size >> 8) & 0xff; |
3296 | bp[psdo + 1] = size & 0xff; |
3297 | bp[pgo + 3] = 1; |
3298 | if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) |
3299 | bp[pgo + MP_OFF_PAGE_LENGTH] = 8; |
3300 | DEBC(printk(ST_DEB_MSG |
3301 | "%s: Formatting tape with two partitions (1 = %d MB).\n", |
3302 | name, size)); |
3303 | } |
3304 | bp[pgo + PP_OFF_PART_UNITS] = 0; |
3305 | bp[pgo + PP_OFF_RESERVED] = 0; |
3306 | bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB; |
3307 | |
3308 | result = write_mode_page(STp, PART_PAGE, 1); |
3309 | if (result) { |
3310 | printk(KERN_INFO "%s: Partitioning of tape failed.\n", name); |
3311 | result = (-EIO); |
3312 | } |
3313 | |
3314 | return result; |
3315 | } |
3316 | |
3317 | |
3318 | |
3319 | /* The ioctl command */ |
3320 | static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) |
3321 | { |
3322 | int i, cmd_nr, cmd_type, bt; |
3323 | int retval = 0; |
3324 | unsigned int blk; |
3325 | struct scsi_tape *STp = file->private_data; |
3326 | struct st_modedef *STm; |
3327 | struct st_partstat *STps; |
3328 | char *name = tape_name(STp); |
3329 | void __user *p = (void __user *)arg; |
3330 | |
3331 | if (mutex_lock_interruptible(&STp->lock)) |
3332 | return -ERESTARTSYS; |
3333 | |
3334 | DEB( |
3335 | if (debugging && !STp->in_use) { |
3336 | printk(ST_DEB_MSG "%s: Incorrect device.\n", name); |
3337 | retval = (-EIO); |
3338 | goto out; |
3339 | } ) /* end DEB */ |
3340 | |
3341 | STm = &(STp->modes[STp->current_mode]); |
3342 | STps = &(STp->ps[STp->partition]); |
3343 | |
3344 | /* |
3345 | * If we are in the middle of error recovery, don't let anyone |
3346 | * else try and use this device. Also, if error recovery fails, it |
3347 | * may try and take the device offline, in which case all further |
3348 | * access to the device is prohibited. |
3349 | */ |
3350 | retval = scsi_nonblockable_ioctl(STp->device, cmd_in, p, |
3351 | file->f_flags & O_NDELAY); |
3352 | if (!scsi_block_when_processing_errors(STp->device) || retval != -ENODEV) |
3353 | goto out; |
3354 | retval = 0; |
3355 | |
3356 | cmd_type = _IOC_TYPE(cmd_in); |
3357 | cmd_nr = _IOC_NR(cmd_in); |
3358 | |
3359 | if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { |
3360 | struct mtop mtc; |
3361 | |
3362 | if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { |
3363 | retval = (-EINVAL); |
3364 | goto out; |
3365 | } |
3366 | |
3367 | i = copy_from_user(&mtc, p, sizeof(struct mtop)); |
3368 | if (i) { |
3369 | retval = (-EFAULT); |
3370 | goto out; |
3371 | } |
3372 | |
3373 | if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { |
3374 | printk(KERN_WARNING |
3375 | "%s: MTSETDRVBUFFER only allowed for root.\n", name); |
3376 | retval = (-EPERM); |
3377 | goto out; |
3378 | } |
3379 | if (!STm->defined && |
3380 | (mtc.mt_op != MTSETDRVBUFFER && |
3381 | (mtc.mt_count & MT_ST_OPTIONS) == 0)) { |
3382 | retval = (-ENXIO); |
3383 | goto out; |
3384 | } |
3385 | |
3386 | if (!STp->pos_unknown) { |
3387 | |
3388 | if (STps->eof == ST_FM_HIT) { |
3389 | if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || |
3390 | mtc.mt_op == MTEOM) { |
3391 | mtc.mt_count -= 1; |
3392 | if (STps->drv_file >= 0) |
3393 | STps->drv_file += 1; |
3394 | } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { |
3395 | mtc.mt_count += 1; |
3396 | if (STps->drv_file >= 0) |
3397 | STps->drv_file += 1; |
3398 | } |
3399 | } |
3400 | |
3401 | if (mtc.mt_op == MTSEEK) { |
3402 | /* Old position must be restored if partition will be |
3403 | changed */ |
3404 | i = !STp->can_partitions || |
3405 | (STp->new_partition != STp->partition); |
3406 | } else { |
3407 | i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || |
3408 | mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || |
3409 | mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || |
3410 | mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || |
3411 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || |
3412 | mtc.mt_op == MTCOMPRESSION; |
3413 | } |
3414 | i = flush_buffer(STp, i); |
3415 | if (i < 0) { |
3416 | retval = i; |
3417 | goto out; |
3418 | } |
3419 | if (STps->rw == ST_WRITING && |
3420 | (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || |
3421 | mtc.mt_op == MTSEEK || |
3422 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { |
3423 | i = st_int_ioctl(STp, MTWEOF, 1); |
3424 | if (i < 0) { |
3425 | retval = i; |
3426 | goto out; |
3427 | } |
3428 | if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) |
3429 | mtc.mt_count++; |
3430 | STps->rw = ST_IDLE; |
3431 | } |
3432 | |
3433 | } else { |
3434 | /* |
3435 | * If there was a bus reset, block further access |
3436 | * to this device. If the user wants to rewind the tape, |
3437 | * then reset the flag and allow access again. |
3438 | */ |
3439 | if (mtc.mt_op != MTREW && |
3440 | mtc.mt_op != MTOFFL && |
3441 | mtc.mt_op != MTRETEN && |
3442 | mtc.mt_op != MTERASE && |
3443 | mtc.mt_op != MTSEEK && |
3444 | mtc.mt_op != MTEOM) { |
3445 | retval = (-EIO); |
3446 | goto out; |
3447 | } |
3448 | reset_state(STp); |
3449 | /* remove this when the midlevel properly clears was_reset */ |
3450 | STp->device->was_reset = 0; |
3451 | } |
3452 | |
3453 | if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && |
3454 | mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && |
3455 | mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) |
3456 | STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ |
3457 | |
3458 | if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) |
3459 | do_door_lock(STp, 0); /* Ignore result! */ |
3460 | |
3461 | if (mtc.mt_op == MTSETDRVBUFFER && |
3462 | (mtc.mt_count & MT_ST_OPTIONS) != 0) { |
3463 | retval = st_set_options(STp, mtc.mt_count); |
3464 | goto out; |
3465 | } |
3466 | |
3467 | if (mtc.mt_op == MTSETPART) { |
3468 | if (!STp->can_partitions || |
3469 | mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { |
3470 | retval = (-EINVAL); |
3471 | goto out; |
3472 | } |
3473 | if (mtc.mt_count >= STp->nbr_partitions && |
3474 | (STp->nbr_partitions = nbr_partitions(STp)) < 0) { |
3475 | retval = (-EIO); |
3476 | goto out; |
3477 | } |
3478 | if (mtc.mt_count >= STp->nbr_partitions) { |
3479 | retval = (-EINVAL); |
3480 | goto out; |
3481 | } |
3482 | STp->new_partition = mtc.mt_count; |
3483 | retval = 0; |
3484 | goto out; |
3485 | } |
3486 | |
3487 | if (mtc.mt_op == MTMKPART) { |
3488 | if (!STp->can_partitions) { |
3489 | retval = (-EINVAL); |
3490 | goto out; |
3491 | } |
3492 | if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 || |
3493 | (i = partition_tape(STp, mtc.mt_count)) < 0) { |
3494 | retval = i; |
3495 | goto out; |
3496 | } |
3497 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { |
3498 | STp->ps[i].rw = ST_IDLE; |
3499 | STp->ps[i].at_sm = 0; |
3500 | STp->ps[i].last_block_valid = 0; |
3501 | } |
3502 | STp->partition = STp->new_partition = 0; |
3503 | STp->nbr_partitions = 1; /* Bad guess ?-) */ |
3504 | STps->drv_block = STps->drv_file = 0; |
3505 | retval = 0; |
3506 | goto out; |
3507 | } |
3508 | |
3509 | if (mtc.mt_op == MTSEEK) { |
3510 | i = set_location(STp, mtc.mt_count, STp->new_partition, 0); |
3511 | if (!STp->can_partitions) |
3512 | STp->ps[0].rw = ST_IDLE; |
3513 | retval = i; |
3514 | goto out; |
3515 | } |
3516 | |
3517 | if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { |
3518 | retval = do_load_unload(STp, file, 0); |
3519 | goto out; |
3520 | } |
3521 | |
3522 | if (mtc.mt_op == MTLOAD) { |
3523 | retval = do_load_unload(STp, file, max(1, mtc.mt_count)); |
3524 | goto out; |
3525 | } |
3526 | |
3527 | if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { |
3528 | retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); |
3529 | goto out; |
3530 | } |
3531 | |
3532 | if (STp->can_partitions && STp->ready == ST_READY && |
3533 | (i = switch_partition(STp)) < 0) { |
3534 | retval = i; |
3535 | goto out; |
3536 | } |
3537 | |
3538 | if (mtc.mt_op == MTCOMPRESSION) |
3539 | retval = st_compression(STp, (mtc.mt_count & 1)); |
3540 | else |
3541 | retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); |
3542 | goto out; |
3543 | } |
3544 | if (!STm->defined) { |
3545 | retval = (-ENXIO); |
3546 | goto out; |
3547 | } |
3548 | |
3549 | if ((i = flush_buffer(STp, 0)) < 0) { |
3550 | retval = i; |
3551 | goto out; |
3552 | } |
3553 | if (STp->can_partitions && |
3554 | (i = switch_partition(STp)) < 0) { |
3555 | retval = i; |
3556 | goto out; |
3557 | } |
3558 | |
3559 | if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { |
3560 | struct mtget mt_status; |
3561 | |
3562 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { |
3563 | retval = (-EINVAL); |
3564 | goto out; |
3565 | } |
3566 | |
3567 | mt_status.mt_type = STp->tape_type; |
3568 | mt_status.mt_dsreg = |
3569 | ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | |
3570 | ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); |
3571 | mt_status.mt_blkno = STps->drv_block; |
3572 | mt_status.mt_fileno = STps->drv_file; |
3573 | if (STp->block_size != 0) { |
3574 | if (STps->rw == ST_WRITING) |
3575 | mt_status.mt_blkno += |
3576 | (STp->buffer)->buffer_bytes / STp->block_size; |
3577 | else if (STps->rw == ST_READING) |
3578 | mt_status.mt_blkno -= |
3579 | ((STp->buffer)->buffer_bytes + |
3580 | STp->block_size - 1) / STp->block_size; |
3581 | } |
3582 | |
3583 | mt_status.mt_gstat = 0; |
3584 | if (STp->drv_write_prot) |
3585 | mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); |
3586 | if (mt_status.mt_blkno == 0) { |
3587 | if (mt_status.mt_fileno == 0) |
3588 | mt_status.mt_gstat |= GMT_BOT(0xffffffff); |
3589 | else |
3590 | mt_status.mt_gstat |= GMT_EOF(0xffffffff); |
3591 | } |
3592 | mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); |
3593 | mt_status.mt_resid = STp->partition; |
3594 | if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) |
3595 | mt_status.mt_gstat |= GMT_EOT(0xffffffff); |
3596 | else if (STps->eof >= ST_EOM_OK) |
3597 | mt_status.mt_gstat |= GMT_EOD(0xffffffff); |
3598 | if (STp->density == 1) |
3599 | mt_status.mt_gstat |= GMT_D_800(0xffffffff); |
3600 | else if (STp->density == 2) |
3601 | mt_status.mt_gstat |= GMT_D_1600(0xffffffff); |
3602 | else if (STp->density == 3) |
3603 | mt_status.mt_gstat |= GMT_D_6250(0xffffffff); |
3604 | if (STp->ready == ST_READY) |
3605 | mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); |
3606 | if (STp->ready == ST_NO_TAPE) |
3607 | mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); |
3608 | if (STps->at_sm) |
3609 | mt_status.mt_gstat |= GMT_SM(0xffffffff); |
3610 | if (STm->do_async_writes || |
3611 | (STm->do_buffer_writes && STp->block_size != 0) || |
3612 | STp->drv_buffer != 0) |
3613 | mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); |
3614 | if (STp->cleaning_req) |
3615 | mt_status.mt_gstat |= GMT_CLN(0xffffffff); |
3616 | |
3617 | i = copy_to_user(p, &mt_status, sizeof(struct mtget)); |
3618 | if (i) { |
3619 | retval = (-EFAULT); |
3620 | goto out; |
3621 | } |
3622 | |
3623 | STp->recover_reg = 0; /* Clear after read */ |
3624 | retval = 0; |
3625 | goto out; |
3626 | } /* End of MTIOCGET */ |
3627 | if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { |
3628 | struct mtpos mt_pos; |
3629 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { |
3630 | retval = (-EINVAL); |
3631 | goto out; |
3632 | } |
3633 | if ((i = get_location(STp, &blk, &bt, 0)) < 0) { |
3634 | retval = i; |
3635 | goto out; |
3636 | } |
3637 | mt_pos.mt_blkno = blk; |
3638 | i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); |
3639 | if (i) |
3640 | retval = (-EFAULT); |
3641 | goto out; |
3642 | } |
3643 | mutex_unlock(&STp->lock); |
3644 | switch (cmd_in) { |
3645 | case SCSI_IOCTL_GET_IDLUN: |
3646 | case SCSI_IOCTL_GET_BUS_NUMBER: |
3647 | break; |
3648 | default: |
3649 | if ((cmd_in == SG_IO || |
3650 | cmd_in == SCSI_IOCTL_SEND_COMMAND || |
3651 | cmd_in == CDROM_SEND_PACKET) && |
3652 | !capable(CAP_SYS_RAWIO)) |
3653 | i = -EPERM; |
3654 | else |
3655 | i = scsi_cmd_ioctl(STp->disk->queue, STp->disk, |
3656 | file->f_mode, cmd_in, p); |
3657 | if (i != -ENOTTY) |
3658 | return i; |
3659 | break; |
3660 | } |
3661 | retval = scsi_ioctl(STp->device, cmd_in, p); |
3662 | if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */ |
3663 | STp->rew_at_close = 0; |
3664 | STp->ready = ST_NO_TAPE; |
3665 | } |
3666 | return retval; |
3667 | |
3668 | out: |
3669 | mutex_unlock(&STp->lock); |
3670 | return retval; |
3671 | } |
3672 | |
3673 | #ifdef CONFIG_COMPAT |
3674 | static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
3675 | { |
3676 | struct scsi_tape *STp = file->private_data; |
3677 | struct scsi_device *sdev = STp->device; |
3678 | int ret = -ENOIOCTLCMD; |
3679 | if (sdev->host->hostt->compat_ioctl) { |
3680 | |
3681 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); |
3682 | |
3683 | } |
3684 | return ret; |
3685 | } |
3686 | #endif |
3687 | |
3688 | |
3689 | |
3690 | /* Try to allocate a new tape buffer. Calling function must not hold |
3691 | dev_arr_lock. */ |
3692 | static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) |
3693 | { |
3694 | struct st_buffer *tb; |
3695 | |
3696 | tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC); |
3697 | if (!tb) { |
3698 | printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); |
3699 | return NULL; |
3700 | } |
3701 | tb->frp_segs = 0; |
3702 | tb->use_sg = max_sg; |
3703 | tb->dma = need_dma; |
3704 | tb->buffer_size = 0; |
3705 | |
3706 | tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *), |
3707 | GFP_ATOMIC); |
3708 | if (!tb->reserved_pages) { |
3709 | kfree(tb); |
3710 | return NULL; |
3711 | } |
3712 | |
3713 | return tb; |
3714 | } |
3715 | |
3716 | |
3717 | /* Try to allocate enough space in the tape buffer */ |
3718 | #define ST_MAX_ORDER 6 |
3719 | |
3720 | static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) |
3721 | { |
3722 | int segs, nbr, max_segs, b_size, order, got; |
3723 | gfp_t priority; |
3724 | |
3725 | if (new_size <= STbuffer->buffer_size) |
3726 | return 1; |
3727 | |
3728 | if (STbuffer->buffer_size <= PAGE_SIZE) |
3729 | normalize_buffer(STbuffer); /* Avoid extra segment */ |
3730 | |
3731 | max_segs = STbuffer->use_sg; |
3732 | nbr = max_segs - STbuffer->frp_segs; |
3733 | if (nbr <= 0) |
3734 | return 0; |
3735 | |
3736 | priority = GFP_KERNEL | __GFP_NOWARN; |
3737 | if (need_dma) |
3738 | priority |= GFP_DMA; |
3739 | |
3740 | if (STbuffer->cleared) |
3741 | priority |= __GFP_ZERO; |
3742 | |
3743 | if (STbuffer->frp_segs) { |
3744 | order = STbuffer->reserved_page_order; |
3745 | b_size = PAGE_SIZE << order; |
3746 | } else { |
3747 | for (b_size = PAGE_SIZE, order = 0; |
3748 | order < ST_MAX_ORDER && |
3749 | max_segs * (PAGE_SIZE << order) < new_size; |
3750 | order++, b_size *= 2) |
3751 | ; /* empty */ |
3752 | STbuffer->reserved_page_order = order; |
3753 | } |
3754 | if (max_segs * (PAGE_SIZE << order) < new_size) { |
3755 | if (order == ST_MAX_ORDER) |
3756 | return 0; |
3757 | normalize_buffer(STbuffer); |
3758 | return enlarge_buffer(STbuffer, new_size, need_dma); |
3759 | } |
3760 | |
3761 | for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; |
3762 | segs < max_segs && got < new_size;) { |
3763 | struct page *page; |
3764 | |
3765 | page = alloc_pages(priority, order); |
3766 | if (!page) { |
3767 | DEB(STbuffer->buffer_size = got); |
3768 | normalize_buffer(STbuffer); |
3769 | return 0; |
3770 | } |
3771 | |
3772 | STbuffer->frp_segs += 1; |
3773 | got += b_size; |
3774 | STbuffer->buffer_size = got; |
3775 | STbuffer->reserved_pages[segs] = page; |
3776 | segs++; |
3777 | } |
3778 | STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); |
3779 | |
3780 | return 1; |
3781 | } |
3782 | |
3783 | |
3784 | /* Make sure that no data from previous user is in the internal buffer */ |
3785 | static void clear_buffer(struct st_buffer * st_bp) |
3786 | { |
3787 | int i; |
3788 | |
3789 | for (i=0; i < st_bp->frp_segs; i++) |
3790 | memset(page_address(st_bp->reserved_pages[i]), 0, |
3791 | PAGE_SIZE << st_bp->reserved_page_order); |
3792 | st_bp->cleared = 1; |
3793 | } |
3794 | |
3795 | |
3796 | /* Release the extra buffer */ |
3797 | static void normalize_buffer(struct st_buffer * STbuffer) |
3798 | { |
3799 | int i, order = STbuffer->reserved_page_order; |
3800 | |
3801 | for (i = 0; i < STbuffer->frp_segs; i++) { |
3802 | __free_pages(STbuffer->reserved_pages[i], order); |
3803 | STbuffer->buffer_size -= (PAGE_SIZE << order); |
3804 | } |
3805 | STbuffer->frp_segs = 0; |
3806 | STbuffer->sg_segs = 0; |
3807 | STbuffer->reserved_page_order = 0; |
3808 | STbuffer->map_data.offset = 0; |
3809 | } |
3810 | |
3811 | |
3812 | /* Move data from the user buffer to the tape buffer. Returns zero (success) or |
3813 | negative error code. */ |
3814 | static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) |
3815 | { |
3816 | int i, cnt, res, offset; |
3817 | int length = PAGE_SIZE << st_bp->reserved_page_order; |
3818 | |
3819 | for (i = 0, offset = st_bp->buffer_bytes; |
3820 | i < st_bp->frp_segs && offset >= length; i++) |
3821 | offset -= length; |
3822 | if (i == st_bp->frp_segs) { /* Should never happen */ |
3823 | printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); |
3824 | return (-EIO); |
3825 | } |
3826 | for (; i < st_bp->frp_segs && do_count > 0; i++) { |
3827 | struct page *page = st_bp->reserved_pages[i]; |
3828 | cnt = length - offset < do_count ? length - offset : do_count; |
3829 | res = copy_from_user(page_address(page) + offset, ubp, cnt); |
3830 | if (res) |
3831 | return (-EFAULT); |
3832 | do_count -= cnt; |
3833 | st_bp->buffer_bytes += cnt; |
3834 | ubp += cnt; |
3835 | offset = 0; |
3836 | } |
3837 | if (do_count) /* Should never happen */ |
3838 | return (-EIO); |
3839 | |
3840 | return 0; |
3841 | } |
3842 | |
3843 | |
3844 | /* Move data from the tape buffer to the user buffer. Returns zero (success) or |
3845 | negative error code. */ |
3846 | static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) |
3847 | { |
3848 | int i, cnt, res, offset; |
3849 | int length = PAGE_SIZE << st_bp->reserved_page_order; |
3850 | |
3851 | for (i = 0, offset = st_bp->read_pointer; |
3852 | i < st_bp->frp_segs && offset >= length; i++) |
3853 | offset -= length; |
3854 | if (i == st_bp->frp_segs) { /* Should never happen */ |
3855 | printk(KERN_WARNING "st: from_buffer offset overflow.\n"); |
3856 | return (-EIO); |
3857 | } |
3858 | for (; i < st_bp->frp_segs && do_count > 0; i++) { |
3859 | struct page *page = st_bp->reserved_pages[i]; |
3860 | cnt = length - offset < do_count ? length - offset : do_count; |
3861 | res = copy_to_user(ubp, page_address(page) + offset, cnt); |
3862 | if (res) |
3863 | return (-EFAULT); |
3864 | do_count -= cnt; |
3865 | st_bp->buffer_bytes -= cnt; |
3866 | st_bp->read_pointer += cnt; |
3867 | ubp += cnt; |
3868 | offset = 0; |
3869 | } |
3870 | if (do_count) /* Should never happen */ |
3871 | return (-EIO); |
3872 | |
3873 | return 0; |
3874 | } |
3875 | |
3876 | |
3877 | /* Move data towards start of buffer */ |
3878 | static void move_buffer_data(struct st_buffer * st_bp, int offset) |
3879 | { |
3880 | int src_seg, dst_seg, src_offset = 0, dst_offset; |
3881 | int count, total; |
3882 | int length = PAGE_SIZE << st_bp->reserved_page_order; |
3883 | |
3884 | if (offset == 0) |
3885 | return; |
3886 | |
3887 | total=st_bp->buffer_bytes - offset; |
3888 | for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { |
3889 | src_offset = offset; |
3890 | if (src_offset < length) |
3891 | break; |
3892 | offset -= length; |
3893 | } |
3894 | |
3895 | st_bp->buffer_bytes = st_bp->read_pointer = total; |
3896 | for (dst_seg=dst_offset=0; total > 0; ) { |
3897 | struct page *dpage = st_bp->reserved_pages[dst_seg]; |
3898 | struct page *spage = st_bp->reserved_pages[src_seg]; |
3899 | |
3900 | count = min(length - dst_offset, length - src_offset); |
3901 | memmove(page_address(dpage) + dst_offset, |
3902 | page_address(spage) + src_offset, count); |
3903 | src_offset += count; |
3904 | if (src_offset >= length) { |
3905 | src_seg++; |
3906 | src_offset = 0; |
3907 | } |
3908 | dst_offset += count; |
3909 | if (dst_offset >= length) { |
3910 | dst_seg++; |
3911 | dst_offset = 0; |
3912 | } |
3913 | total -= count; |
3914 | } |
3915 | } |
3916 | |
3917 | /* Validate the options from command line or module parameters */ |
3918 | static void validate_options(void) |
3919 | { |
3920 | if (buffer_kbs > 0) |
3921 | st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; |
3922 | if (max_sg_segs >= ST_FIRST_SG) |
3923 | st_max_sg_segs = max_sg_segs; |
3924 | } |
3925 | |
3926 | #ifndef MODULE |
3927 | /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. |
3928 | */ |
3929 | static int __init st_setup(char *str) |
3930 | { |
3931 | int i, len, ints[5]; |
3932 | char *stp; |
3933 | |
3934 | stp = get_options(str, ARRAY_SIZE(ints), ints); |
3935 | |
3936 | if (ints[0] > 0) { |
3937 | for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) |
3938 | if (parms[i].val) |
3939 | *parms[i].val = ints[i + 1]; |
3940 | } else { |
3941 | while (stp != NULL) { |
3942 | for (i = 0; i < ARRAY_SIZE(parms); i++) { |
3943 | len = strlen(parms[i].name); |
3944 | if (!strncmp(stp, parms[i].name, len) && |
3945 | (*(stp + len) == ':' || *(stp + len) == '=')) { |
3946 | if (parms[i].val) |
3947 | *parms[i].val = |
3948 | simple_strtoul(stp + len + 1, NULL, 0); |
3949 | else |
3950 | printk(KERN_WARNING "st: Obsolete parameter %s\n", |
3951 | parms[i].name); |
3952 | break; |
3953 | } |
3954 | } |
3955 | if (i >= ARRAY_SIZE(parms)) |
3956 | printk(KERN_WARNING "st: invalid parameter in '%s'\n", |
3957 | stp); |
3958 | stp = strchr(stp, ','); |
3959 | if (stp) |
3960 | stp++; |
3961 | } |
3962 | } |
3963 | |
3964 | validate_options(); |
3965 | |
3966 | return 1; |
3967 | } |
3968 | |
3969 | __setup("st=", st_setup); |
3970 | |
3971 | #endif |
3972 | |
3973 | static const struct file_operations st_fops = |
3974 | { |
3975 | .owner = THIS_MODULE, |
3976 | .read = st_read, |
3977 | .write = st_write, |
3978 | .unlocked_ioctl = st_ioctl, |
3979 | #ifdef CONFIG_COMPAT |
3980 | .compat_ioctl = st_compat_ioctl, |
3981 | #endif |
3982 | .open = st_open, |
3983 | .flush = st_flush, |
3984 | .release = st_release, |
3985 | .llseek = noop_llseek, |
3986 | }; |
3987 | |
3988 | static int create_one_cdev(struct scsi_tape *tape, int mode, int rew) |
3989 | { |
3990 | int i, error; |
3991 | dev_t cdev_devno; |
3992 | struct cdev *cdev; |
3993 | struct device *dev; |
3994 | struct st_modedef *STm = &(tape->modes[mode]); |
3995 | char name[10]; |
3996 | int dev_num = tape->index; |
3997 | |
3998 | cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew)); |
3999 | |
4000 | cdev = cdev_alloc(); |
4001 | if (!cdev) { |
4002 | pr_err("st%d: out of memory. Device not attached.\n", dev_num); |
4003 | error = -ENOMEM; |
4004 | goto out; |
4005 | } |
4006 | cdev->owner = THIS_MODULE; |
4007 | cdev->ops = &st_fops; |
4008 | |
4009 | error = cdev_add(cdev, cdev_devno, 1); |
4010 | if (error) { |
4011 | pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num, |
4012 | rew ? "non" : "auto", mode); |
4013 | pr_err("st%d: Device not attached.\n", dev_num); |
4014 | goto out_free; |
4015 | } |
4016 | STm->cdevs[rew] = cdev; |
4017 | |
4018 | i = mode << (4 - ST_NBR_MODE_BITS); |
4019 | snprintf(name, 10, "%s%s%s", rew ? "n" : "", |
4020 | tape->disk->disk_name, st_formats[i]); |
4021 | |
4022 | dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev, |
4023 | cdev_devno, &tape->modes[mode], "%s", name); |
4024 | if (IS_ERR(dev)) { |
4025 | pr_err("st%d: device_create failed\n", dev_num); |
4026 | error = PTR_ERR(dev); |
4027 | goto out_free; |
4028 | } |
4029 | |
4030 | STm->devs[rew] = dev; |
4031 | |
4032 | return 0; |
4033 | out_free: |
4034 | cdev_del(STm->cdevs[rew]); |
4035 | STm->cdevs[rew] = NULL; |
4036 | out: |
4037 | return error; |
4038 | } |
4039 | |
4040 | static int create_cdevs(struct scsi_tape *tape) |
4041 | { |
4042 | int mode, error; |
4043 | for (mode = 0; mode < ST_NBR_MODES; ++mode) { |
4044 | error = create_one_cdev(tape, mode, 0); |
4045 | if (error) |
4046 | return error; |
4047 | error = create_one_cdev(tape, mode, 1); |
4048 | if (error) |
4049 | return error; |
4050 | } |
4051 | |
4052 | return sysfs_create_link(&tape->device->sdev_gendev.kobj, |
4053 | &tape->modes[0].devs[0]->kobj, "tape"); |
4054 | } |
4055 | |
4056 | static void remove_cdevs(struct scsi_tape *tape) |
4057 | { |
4058 | int mode, rew; |
4059 | sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape"); |
4060 | for (mode = 0; mode < ST_NBR_MODES; mode++) { |
4061 | struct st_modedef *STm = &(tape->modes[mode]); |
4062 | for (rew = 0; rew < 2; rew++) { |
4063 | if (STm->cdevs[rew]) |
4064 | cdev_del(STm->cdevs[rew]); |
4065 | if (STm->devs[rew]) |
4066 | device_unregister(STm->devs[rew]); |
4067 | } |
4068 | } |
4069 | } |
4070 | |
4071 | static int st_probe(struct device *dev) |
4072 | { |
4073 | struct scsi_device *SDp = to_scsi_device(dev); |
4074 | struct gendisk *disk = NULL; |
4075 | struct scsi_tape *tpnt = NULL; |
4076 | struct st_modedef *STm; |
4077 | struct st_partstat *STps; |
4078 | struct st_buffer *buffer; |
4079 | int i, error; |
4080 | char *stp; |
4081 | |
4082 | if (SDp->type != TYPE_TAPE) |
4083 | return -ENODEV; |
4084 | if ((stp = st_incompatible(SDp))) { |
4085 | sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n"); |
4086 | printk(KERN_INFO "st: The suggested driver is %s.\n", stp); |
4087 | return -ENODEV; |
4088 | } |
4089 | |
4090 | i = queue_max_segments(SDp->request_queue); |
4091 | if (st_max_sg_segs < i) |
4092 | i = st_max_sg_segs; |
4093 | buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i); |
4094 | if (buffer == NULL) { |
4095 | printk(KERN_ERR |
4096 | "st: Can't allocate new tape buffer. Device not attached.\n"); |
4097 | goto out; |
4098 | } |
4099 | |
4100 | disk = alloc_disk(1); |
4101 | if (!disk) { |
4102 | printk(KERN_ERR "st: out of memory. Device not attached.\n"); |
4103 | goto out_buffer_free; |
4104 | } |
4105 | |
4106 | tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC); |
4107 | if (tpnt == NULL) { |
4108 | printk(KERN_ERR "st: Can't allocate device descriptor.\n"); |
4109 | goto out_put_disk; |
4110 | } |
4111 | kref_init(&tpnt->kref); |
4112 | tpnt->disk = disk; |
4113 | disk->private_data = &tpnt->driver; |
4114 | disk->queue = SDp->request_queue; |
4115 | /* SCSI tape doesn't register this gendisk via add_disk(). Manually |
4116 | * take queue reference that release_disk() expects. */ |
4117 | if (!blk_get_queue(disk->queue)) |
4118 | goto out_put_disk; |
4119 | tpnt->driver = &st_template; |
4120 | |
4121 | tpnt->device = SDp; |
4122 | if (SDp->scsi_level <= 2) |
4123 | tpnt->tape_type = MT_ISSCSI1; |
4124 | else |
4125 | tpnt->tape_type = MT_ISSCSI2; |
4126 | |
4127 | tpnt->buffer = buffer; |
4128 | tpnt->buffer->last_SRpnt = NULL; |
4129 | |
4130 | tpnt->inited = 0; |
4131 | tpnt->dirty = 0; |
4132 | tpnt->in_use = 0; |
4133 | tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ |
4134 | tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; |
4135 | tpnt->use_pf = (SDp->scsi_level >= SCSI_2); |
4136 | tpnt->density = 0; |
4137 | tpnt->do_auto_lock = ST_AUTO_LOCK; |
4138 | tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ |
4139 | tpnt->can_partitions = 0; |
4140 | tpnt->two_fm = ST_TWO_FM; |
4141 | tpnt->fast_mteom = ST_FAST_MTEOM; |
4142 | tpnt->scsi2_logical = ST_SCSI2LOGICAL; |
4143 | tpnt->sili = ST_SILI; |
4144 | tpnt->immediate = ST_NOWAIT; |
4145 | tpnt->immediate_filemark = 0; |
4146 | tpnt->default_drvbuffer = 0xff; /* No forced buffering */ |
4147 | tpnt->partition = 0; |
4148 | tpnt->new_partition = 0; |
4149 | tpnt->nbr_partitions = 0; |
4150 | blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT); |
4151 | tpnt->long_timeout = ST_LONG_TIMEOUT; |
4152 | tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; |
4153 | |
4154 | for (i = 0; i < ST_NBR_MODES; i++) { |
4155 | STm = &(tpnt->modes[i]); |
4156 | STm->defined = 0; |
4157 | STm->sysv = ST_SYSV; |
4158 | STm->defaults_for_writes = 0; |
4159 | STm->do_async_writes = ST_ASYNC_WRITES; |
4160 | STm->do_buffer_writes = ST_BUFFER_WRITES; |
4161 | STm->do_read_ahead = ST_READ_AHEAD; |
4162 | STm->default_compression = ST_DONT_TOUCH; |
4163 | STm->default_blksize = (-1); /* No forced size */ |
4164 | STm->default_density = (-1); /* No forced density */ |
4165 | STm->tape = tpnt; |
4166 | } |
4167 | |
4168 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { |
4169 | STps = &(tpnt->ps[i]); |
4170 | STps->rw = ST_IDLE; |
4171 | STps->eof = ST_NOEOF; |
4172 | STps->at_sm = 0; |
4173 | STps->last_block_valid = 0; |
4174 | STps->drv_block = (-1); |
4175 | STps->drv_file = (-1); |
4176 | } |
4177 | |
4178 | tpnt->current_mode = 0; |
4179 | tpnt->modes[0].defined = 1; |
4180 | |
4181 | tpnt->density_changed = tpnt->compression_changed = |
4182 | tpnt->blksize_changed = 0; |
4183 | mutex_init(&tpnt->lock); |
4184 | |
4185 | idr_preload(GFP_KERNEL); |
4186 | spin_lock(&st_index_lock); |
4187 | error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT); |
4188 | spin_unlock(&st_index_lock); |
4189 | idr_preload_end(); |
4190 | if (error < 0) { |
4191 | pr_warn("st: idr allocation failed: %d\n", error); |
4192 | goto out_put_queue; |
4193 | } |
4194 | tpnt->index = error; |
4195 | sprintf(disk->disk_name, "st%d", tpnt->index); |
4196 | |
4197 | dev_set_drvdata(dev, tpnt); |
4198 | |
4199 | |
4200 | error = create_cdevs(tpnt); |
4201 | if (error) |
4202 | goto out_remove_devs; |
4203 | scsi_autopm_put_device(SDp); |
4204 | |
4205 | sdev_printk(KERN_NOTICE, SDp, |
4206 | "Attached scsi tape %s\n", tape_name(tpnt)); |
4207 | sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n", |
4208 | tape_name(tpnt), tpnt->try_dio ? "yes" : "no", |
4209 | queue_dma_alignment(SDp->request_queue) + 1); |
4210 | |
4211 | return 0; |
4212 | |
4213 | out_remove_devs: |
4214 | remove_cdevs(tpnt); |
4215 | spin_lock(&st_index_lock); |
4216 | idr_remove(&st_index_idr, tpnt->index); |
4217 | spin_unlock(&st_index_lock); |
4218 | out_put_queue: |
4219 | blk_put_queue(disk->queue); |
4220 | out_put_disk: |
4221 | put_disk(disk); |
4222 | kfree(tpnt); |
4223 | out_buffer_free: |
4224 | kfree(buffer); |
4225 | out: |
4226 | return -ENODEV; |
4227 | }; |
4228 | |
4229 | |
4230 | static int st_remove(struct device *dev) |
4231 | { |
4232 | struct scsi_tape *tpnt = dev_get_drvdata(dev); |
4233 | int index = tpnt->index; |
4234 | |
4235 | scsi_autopm_get_device(to_scsi_device(dev)); |
4236 | remove_cdevs(tpnt); |
4237 | |
4238 | mutex_lock(&st_ref_mutex); |
4239 | kref_put(&tpnt->kref, scsi_tape_release); |
4240 | mutex_unlock(&st_ref_mutex); |
4241 | spin_lock(&st_index_lock); |
4242 | idr_remove(&st_index_idr, index); |
4243 | spin_unlock(&st_index_lock); |
4244 | return 0; |
4245 | } |
4246 | |
4247 | /** |
4248 | * scsi_tape_release - Called to free the Scsi_Tape structure |
4249 | * @kref: pointer to embedded kref |
4250 | * |
4251 | * st_ref_mutex must be held entering this routine. Because it is |
4252 | * called on last put, you should always use the scsi_tape_get() |
4253 | * scsi_tape_put() helpers which manipulate the semaphore directly |
4254 | * and never do a direct kref_put(). |
4255 | **/ |
4256 | static void scsi_tape_release(struct kref *kref) |
4257 | { |
4258 | struct scsi_tape *tpnt = to_scsi_tape(kref); |
4259 | struct gendisk *disk = tpnt->disk; |
4260 | |
4261 | tpnt->device = NULL; |
4262 | |
4263 | if (tpnt->buffer) { |
4264 | normalize_buffer(tpnt->buffer); |
4265 | kfree(tpnt->buffer->reserved_pages); |
4266 | kfree(tpnt->buffer); |
4267 | } |
4268 | |
4269 | disk->private_data = NULL; |
4270 | put_disk(disk); |
4271 | kfree(tpnt); |
4272 | return; |
4273 | } |
4274 | |
4275 | static struct class st_sysfs_class = { |
4276 | .name = "scsi_tape", |
4277 | .dev_attrs = st_dev_attrs, |
4278 | }; |
4279 | |
4280 | static int __init init_st(void) |
4281 | { |
4282 | int err; |
4283 | |
4284 | validate_options(); |
4285 | |
4286 | printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n", |
4287 | verstr, st_fixed_buffer_size, st_max_sg_segs); |
4288 | |
4289 | err = class_register(&st_sysfs_class); |
4290 | if (err) { |
4291 | pr_err("Unable register sysfs class for SCSI tapes\n"); |
4292 | return err; |
4293 | } |
4294 | |
4295 | err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), |
4296 | ST_MAX_TAPE_ENTRIES, "st"); |
4297 | if (err) { |
4298 | printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", |
4299 | SCSI_TAPE_MAJOR); |
4300 | goto err_class; |
4301 | } |
4302 | |
4303 | err = scsi_register_driver(&st_template.gendrv); |
4304 | if (err) |
4305 | goto err_chrdev; |
4306 | |
4307 | err = do_create_sysfs_files(); |
4308 | if (err) |
4309 | goto err_scsidrv; |
4310 | |
4311 | return 0; |
4312 | |
4313 | err_scsidrv: |
4314 | scsi_unregister_driver(&st_template.gendrv); |
4315 | err_chrdev: |
4316 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), |
4317 | ST_MAX_TAPE_ENTRIES); |
4318 | err_class: |
4319 | class_unregister(&st_sysfs_class); |
4320 | return err; |
4321 | } |
4322 | |
4323 | static void __exit exit_st(void) |
4324 | { |
4325 | do_remove_sysfs_files(); |
4326 | scsi_unregister_driver(&st_template.gendrv); |
4327 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), |
4328 | ST_MAX_TAPE_ENTRIES); |
4329 | class_unregister(&st_sysfs_class); |
4330 | printk(KERN_INFO "st: Unloaded.\n"); |
4331 | } |
4332 | |
4333 | module_init(init_st); |
4334 | module_exit(exit_st); |
4335 | |
4336 | |
4337 | /* The sysfs driver interface. Read-only at the moment */ |
4338 | static ssize_t st_try_direct_io_show(struct device_driver *ddp, char *buf) |
4339 | { |
4340 | return snprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); |
4341 | } |
4342 | static DRIVER_ATTR(try_direct_io, S_IRUGO, st_try_direct_io_show, NULL); |
4343 | |
4344 | static ssize_t st_fixed_buffer_size_show(struct device_driver *ddp, char *buf) |
4345 | { |
4346 | return snprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); |
4347 | } |
4348 | static DRIVER_ATTR(fixed_buffer_size, S_IRUGO, st_fixed_buffer_size_show, NULL); |
4349 | |
4350 | static ssize_t st_max_sg_segs_show(struct device_driver *ddp, char *buf) |
4351 | { |
4352 | return snprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); |
4353 | } |
4354 | static DRIVER_ATTR(max_sg_segs, S_IRUGO, st_max_sg_segs_show, NULL); |
4355 | |
4356 | static ssize_t st_version_show(struct device_driver *ddd, char *buf) |
4357 | { |
4358 | return snprintf(buf, PAGE_SIZE, "[%s]\n", verstr); |
4359 | } |
4360 | static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL); |
4361 | |
4362 | static int do_create_sysfs_files(void) |
4363 | { |
4364 | struct device_driver *sysfs = &st_template.gendrv; |
4365 | int err; |
4366 | |
4367 | err = driver_create_file(sysfs, &driver_attr_try_direct_io); |
4368 | if (err) |
4369 | return err; |
4370 | err = driver_create_file(sysfs, &driver_attr_fixed_buffer_size); |
4371 | if (err) |
4372 | goto err_try_direct_io; |
4373 | err = driver_create_file(sysfs, &driver_attr_max_sg_segs); |
4374 | if (err) |
4375 | goto err_attr_fixed_buf; |
4376 | err = driver_create_file(sysfs, &driver_attr_version); |
4377 | if (err) |
4378 | goto err_attr_max_sg; |
4379 | |
4380 | return 0; |
4381 | |
4382 | err_attr_max_sg: |
4383 | driver_remove_file(sysfs, &driver_attr_max_sg_segs); |
4384 | err_attr_fixed_buf: |
4385 | driver_remove_file(sysfs, &driver_attr_fixed_buffer_size); |
4386 | err_try_direct_io: |
4387 | driver_remove_file(sysfs, &driver_attr_try_direct_io); |
4388 | return err; |
4389 | } |
4390 | |
4391 | static void do_remove_sysfs_files(void) |
4392 | { |
4393 | struct device_driver *sysfs = &st_template.gendrv; |
4394 | |
4395 | driver_remove_file(sysfs, &driver_attr_version); |
4396 | driver_remove_file(sysfs, &driver_attr_max_sg_segs); |
4397 | driver_remove_file(sysfs, &driver_attr_fixed_buffer_size); |
4398 | driver_remove_file(sysfs, &driver_attr_try_direct_io); |
4399 | } |
4400 | |
4401 | /* The sysfs simple class interface */ |
4402 | static ssize_t |
4403 | defined_show(struct device *dev, struct device_attribute *attr, char *buf) |
4404 | { |
4405 | struct st_modedef *STm = dev_get_drvdata(dev); |
4406 | ssize_t l = 0; |
4407 | |
4408 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); |
4409 | return l; |
4410 | } |
4411 | |
4412 | static ssize_t |
4413 | default_blksize_show(struct device *dev, struct device_attribute *attr, |
4414 | char *buf) |
4415 | { |
4416 | struct st_modedef *STm = dev_get_drvdata(dev); |
4417 | ssize_t l = 0; |
4418 | |
4419 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); |
4420 | return l; |
4421 | } |
4422 | |
4423 | |
4424 | static ssize_t |
4425 | default_density_show(struct device *dev, struct device_attribute *attr, |
4426 | char *buf) |
4427 | { |
4428 | struct st_modedef *STm = dev_get_drvdata(dev); |
4429 | ssize_t l = 0; |
4430 | char *fmt; |
4431 | |
4432 | fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; |
4433 | l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); |
4434 | return l; |
4435 | } |
4436 | |
4437 | static ssize_t |
4438 | default_compression_show(struct device *dev, struct device_attribute *attr, |
4439 | char *buf) |
4440 | { |
4441 | struct st_modedef *STm = dev_get_drvdata(dev); |
4442 | ssize_t l = 0; |
4443 | |
4444 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); |
4445 | return l; |
4446 | } |
4447 | |
4448 | static ssize_t |
4449 | options_show(struct device *dev, struct device_attribute *attr, char *buf) |
4450 | { |
4451 | struct st_modedef *STm = dev_get_drvdata(dev); |
4452 | struct scsi_tape *STp = STm->tape; |
4453 | int options; |
4454 | ssize_t l = 0; |
4455 | |
4456 | options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; |
4457 | options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; |
4458 | options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; |
4459 | DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); |
4460 | options |= STp->two_fm ? MT_ST_TWO_FM : 0; |
4461 | options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; |
4462 | options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; |
4463 | options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; |
4464 | options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; |
4465 | options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; |
4466 | options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; |
4467 | options |= STm->sysv ? MT_ST_SYSV : 0; |
4468 | options |= STp->immediate ? MT_ST_NOWAIT : 0; |
4469 | options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0; |
4470 | options |= STp->sili ? MT_ST_SILI : 0; |
4471 | |
4472 | l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); |
4473 | return l; |
4474 | } |
4475 | |
4476 | static struct device_attribute st_dev_attrs[] = { |
4477 | __ATTR_RO(defined), |
4478 | __ATTR_RO(default_blksize), |
4479 | __ATTR_RO(default_density), |
4480 | __ATTR_RO(default_compression), |
4481 | __ATTR_RO(options), |
4482 | __ATTR_NULL, |
4483 | }; |
4484 | |
4485 | /* The following functions may be useful for a larger audience. */ |
4486 | static int sgl_map_user_pages(struct st_buffer *STbp, |
4487 | const unsigned int max_pages, unsigned long uaddr, |
4488 | size_t count, int rw) |
4489 | { |
4490 | unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; |
4491 | unsigned long start = uaddr >> PAGE_SHIFT; |
4492 | const int nr_pages = end - start; |
4493 | int res, i, j; |
4494 | struct page **pages; |
4495 | struct rq_map_data *mdata = &STbp->map_data; |
4496 | |
4497 | /* User attempted Overflow! */ |
4498 | if ((uaddr + count) < uaddr) |
4499 | return -EINVAL; |
4500 | |
4501 | /* Too big */ |
4502 | if (nr_pages > max_pages) |
4503 | return -ENOMEM; |
4504 | |
4505 | /* Hmm? */ |
4506 | if (count == 0) |
4507 | return 0; |
4508 | |
4509 | if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL) |
4510 | return -ENOMEM; |
4511 | |
4512 | /* Try to fault in all of the necessary pages */ |
4513 | down_read(¤t->mm->mmap_sem); |
4514 | /* rw==READ means read from drive, write into memory area */ |
4515 | res = get_user_pages( |
4516 | current, |
4517 | current->mm, |
4518 | uaddr, |
4519 | nr_pages, |
4520 | rw == READ, |
4521 | 0, /* don't force */ |
4522 | pages, |
4523 | NULL); |
4524 | up_read(¤t->mm->mmap_sem); |
4525 | |
4526 | /* Errors and no page mapped should return here */ |
4527 | if (res < nr_pages) |
4528 | goto out_unmap; |
4529 | |
4530 | for (i=0; i < nr_pages; i++) { |
4531 | /* FIXME: flush superflous for rw==READ, |
4532 | * probably wrong function for rw==WRITE |
4533 | */ |
4534 | flush_dcache_page(pages[i]); |
4535 | } |
4536 | |
4537 | mdata->offset = uaddr & ~PAGE_MASK; |
4538 | STbp->mapped_pages = pages; |
4539 | |
4540 | return nr_pages; |
4541 | out_unmap: |
4542 | if (res > 0) { |
4543 | for (j=0; j < res; j++) |
4544 | page_cache_release(pages[j]); |
4545 | res = 0; |
4546 | } |
4547 | kfree(pages); |
4548 | return res; |
4549 | } |
4550 | |
4551 | |
4552 | /* And unmap them... */ |
4553 | static int sgl_unmap_user_pages(struct st_buffer *STbp, |
4554 | const unsigned int nr_pages, int dirtied) |
4555 | { |
4556 | int i; |
4557 | |
4558 | for (i=0; i < nr_pages; i++) { |
4559 | struct page *page = STbp->mapped_pages[i]; |
4560 | |
4561 | if (dirtied) |
4562 | SetPageDirty(page); |
4563 | /* FIXME: cache flush missing for rw==READ |
4564 | * FIXME: call the correct reference counting function |
4565 | */ |
4566 | page_cache_release(page); |
4567 | } |
4568 | kfree(STbp->mapped_pages); |
4569 | STbp->mapped_pages = NULL; |
4570 | |
4571 | return 0; |
4572 | } |
4573 |
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