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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 - 2016 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 = "20160209"; | |
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 <linux/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 1 | |
60 | #define NO_DEBUG 0 | |
61 | ||
62 | #define ST_DEB_MSG KERN_NOTICE | |
63 | #if DEBUG | |
64 | /* The message level for the debug messages is currently set to KERN_NOTICE | |
65 | so that people can easily see the messages. Later when the debugging messages | |
66 | in the drivers are more widely classified, this may be changed to KERN_DEBUG. */ | |
67 | #define DEB(a) a | |
68 | #define DEBC(a) if (debugging) { a ; } | |
69 | #else | |
70 | #define DEB(a) | |
71 | #define DEBC(a) | |
72 | #endif | |
73 | ||
74 | #define ST_KILOBYTE 1024 | |
75 | ||
76 | #include "st_options.h" | |
77 | #include "st.h" | |
78 | ||
79 | static int buffer_kbs; | |
80 | static int max_sg_segs; | |
81 | static int try_direct_io = TRY_DIRECT_IO; | |
82 | static int try_rdio = 1; | |
83 | static int try_wdio = 1; | |
84 | static int debug_flag; | |
85 | ||
86 | static struct class st_sysfs_class; | |
87 | static const struct attribute_group *st_dev_groups[]; | |
88 | static const struct attribute_group *st_drv_groups[]; | |
89 | ||
90 | MODULE_AUTHOR("Kai Makisara"); | |
91 | MODULE_DESCRIPTION("SCSI tape (st) driver"); | |
92 | MODULE_LICENSE("GPL"); | |
93 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR); | |
94 | MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE); | |
95 | ||
96 | /* Set 'perm' (4th argument) to 0 to disable module_param's definition | |
97 | * of sysfs parameters (which module_param doesn't yet support). | |
98 | * Sysfs parameters defined explicitly later. | |
99 | */ | |
100 | module_param_named(buffer_kbs, buffer_kbs, int, 0); | |
101 | MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)"); | |
102 | module_param_named(max_sg_segs, max_sg_segs, int, 0); | |
103 | MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)"); | |
104 | module_param_named(try_direct_io, try_direct_io, int, 0); | |
105 | MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)"); | |
106 | module_param_named(debug_flag, debug_flag, int, 0); | |
107 | MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1"); | |
108 | ||
109 | ||
110 | /* Extra parameters for testing */ | |
111 | module_param_named(try_rdio, try_rdio, int, 0); | |
112 | MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); | |
113 | module_param_named(try_wdio, try_wdio, int, 0); | |
114 | MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); | |
115 | ||
116 | #ifndef MODULE | |
117 | static int write_threshold_kbs; /* retained for compatibility */ | |
118 | static struct st_dev_parm { | |
119 | char *name; | |
120 | int *val; | |
121 | } parms[] __initdata = { | |
122 | { | |
123 | "buffer_kbs", &buffer_kbs | |
124 | }, | |
125 | { /* Retained for compatibility with 2.4 */ | |
126 | "write_threshold_kbs", &write_threshold_kbs | |
127 | }, | |
128 | { | |
129 | "max_sg_segs", NULL | |
130 | }, | |
131 | { | |
132 | "try_direct_io", &try_direct_io | |
133 | }, | |
134 | { | |
135 | "debug_flag", &debug_flag | |
136 | } | |
137 | }; | |
138 | #endif | |
139 | ||
140 | /* Restrict the number of modes so that names for all are assigned */ | |
141 | #if ST_NBR_MODES > 16 | |
142 | #error "Maximum number of modes is 16" | |
143 | #endif | |
144 | /* Bit reversed order to get same names for same minors with all | |
145 | mode counts */ | |
146 | static const char *st_formats[] = { | |
147 | "", "r", "k", "s", "l", "t", "o", "u", | |
148 | "m", "v", "p", "x", "a", "y", "q", "z"}; | |
149 | ||
150 | /* The default definitions have been moved to st_options.h */ | |
151 | ||
152 | #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) | |
153 | ||
154 | /* The buffer size should fit into the 24 bits for length in the | |
155 | 6-byte SCSI read and write commands. */ | |
156 | #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) | |
157 | #error "Buffer size should not exceed (2 << 24 - 1) bytes!" | |
158 | #endif | |
159 | ||
160 | static int debugging = DEBUG; | |
161 | ||
162 | #define MAX_RETRIES 0 | |
163 | #define MAX_WRITE_RETRIES 0 | |
164 | #define MAX_READY_RETRIES 0 | |
165 | #define NO_TAPE NOT_READY | |
166 | ||
167 | #define ST_TIMEOUT (900 * HZ) | |
168 | #define ST_LONG_TIMEOUT (14000 * HZ) | |
169 | ||
170 | /* Remove mode bits and auto-rewind bit (7) */ | |
171 | #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ | |
172 | (iminor(x) & ~(-1 << ST_MODE_SHIFT)) ) | |
173 | #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) | |
174 | ||
175 | /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ | |
176 | #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ | |
177 | (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) | |
178 | ||
179 | /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower | |
180 | 24 bits) */ | |
181 | #define SET_DENS_AND_BLK 0x10001 | |
182 | ||
183 | static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; | |
184 | static int st_max_sg_segs = ST_MAX_SG; | |
185 | ||
186 | static int modes_defined; | |
187 | ||
188 | static int enlarge_buffer(struct st_buffer *, int, int); | |
189 | static void clear_buffer(struct st_buffer *); | |
190 | static void normalize_buffer(struct st_buffer *); | |
191 | static int append_to_buffer(const char __user *, struct st_buffer *, int); | |
192 | static int from_buffer(struct st_buffer *, char __user *, int); | |
193 | static void move_buffer_data(struct st_buffer *, int); | |
194 | ||
195 | static int sgl_map_user_pages(struct st_buffer *, const unsigned int, | |
196 | unsigned long, size_t, int); | |
197 | static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int); | |
198 | ||
199 | static int st_probe(struct device *); | |
200 | static int st_remove(struct device *); | |
201 | ||
202 | static struct scsi_driver st_template = { | |
203 | .gendrv = { | |
204 | .name = "st", | |
205 | .owner = THIS_MODULE, | |
206 | .probe = st_probe, | |
207 | .remove = st_remove, | |
208 | .groups = st_drv_groups, | |
209 | }, | |
210 | }; | |
211 | ||
212 | static int st_compression(struct scsi_tape *, int); | |
213 | ||
214 | static int find_partition(struct scsi_tape *); | |
215 | static int switch_partition(struct scsi_tape *); | |
216 | ||
217 | static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); | |
218 | ||
219 | static void scsi_tape_release(struct kref *); | |
220 | ||
221 | #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref) | |
222 | ||
223 | static DEFINE_MUTEX(st_ref_mutex); | |
224 | static DEFINE_SPINLOCK(st_index_lock); | |
225 | static DEFINE_SPINLOCK(st_use_lock); | |
226 | static DEFINE_IDR(st_index_idr); | |
227 | ||
228 | ||
229 | \f | |
230 | #include "osst_detect.h" | |
231 | #ifndef SIGS_FROM_OSST | |
232 | #define SIGS_FROM_OSST \ | |
233 | {"OnStream", "SC-", "", "osst"}, \ | |
234 | {"OnStream", "DI-", "", "osst"}, \ | |
235 | {"OnStream", "DP-", "", "osst"}, \ | |
236 | {"OnStream", "USB", "", "osst"}, \ | |
237 | {"OnStream", "FW-", "", "osst"} | |
238 | #endif | |
239 | ||
240 | static struct scsi_tape *scsi_tape_get(int dev) | |
241 | { | |
242 | struct scsi_tape *STp = NULL; | |
243 | ||
244 | mutex_lock(&st_ref_mutex); | |
245 | spin_lock(&st_index_lock); | |
246 | ||
247 | STp = idr_find(&st_index_idr, dev); | |
248 | if (!STp) goto out; | |
249 | ||
250 | kref_get(&STp->kref); | |
251 | ||
252 | if (!STp->device) | |
253 | goto out_put; | |
254 | ||
255 | if (scsi_device_get(STp->device)) | |
256 | goto out_put; | |
257 | ||
258 | goto out; | |
259 | ||
260 | out_put: | |
261 | kref_put(&STp->kref, scsi_tape_release); | |
262 | STp = NULL; | |
263 | out: | |
264 | spin_unlock(&st_index_lock); | |
265 | mutex_unlock(&st_ref_mutex); | |
266 | return STp; | |
267 | } | |
268 | ||
269 | static void scsi_tape_put(struct scsi_tape *STp) | |
270 | { | |
271 | struct scsi_device *sdev = STp->device; | |
272 | ||
273 | mutex_lock(&st_ref_mutex); | |
274 | kref_put(&STp->kref, scsi_tape_release); | |
275 | scsi_device_put(sdev); | |
276 | mutex_unlock(&st_ref_mutex); | |
277 | } | |
278 | ||
279 | struct st_reject_data { | |
280 | char *vendor; | |
281 | char *model; | |
282 | char *rev; | |
283 | char *driver_hint; /* Name of the correct driver, NULL if unknown */ | |
284 | }; | |
285 | ||
286 | static struct st_reject_data reject_list[] = { | |
287 | /* {"XXX", "Yy-", "", NULL}, example */ | |
288 | SIGS_FROM_OSST, | |
289 | {NULL, }}; | |
290 | ||
291 | /* If the device signature is on the list of incompatible drives, the | |
292 | function returns a pointer to the name of the correct driver (if known) */ | |
293 | static char * st_incompatible(struct scsi_device* SDp) | |
294 | { | |
295 | struct st_reject_data *rp; | |
296 | ||
297 | for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) | |
298 | if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && | |
299 | !strncmp(rp->model, SDp->model, strlen(rp->model)) && | |
300 | !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { | |
301 | if (rp->driver_hint) | |
302 | return rp->driver_hint; | |
303 | else | |
304 | return "unknown"; | |
305 | } | |
306 | return NULL; | |
307 | } | |
308 | \f | |
309 | ||
310 | static inline char *tape_name(struct scsi_tape *tape) | |
311 | { | |
312 | return tape->disk->disk_name; | |
313 | } | |
314 | ||
315 | #define st_printk(prefix, t, fmt, a...) \ | |
316 | sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a) | |
317 | #ifdef DEBUG | |
318 | #define DEBC_printk(t, fmt, a...) \ | |
319 | if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); } | |
320 | #else | |
321 | #define DEBC_printk(t, fmt, a...) | |
322 | #endif | |
323 | ||
324 | static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s) | |
325 | { | |
326 | const u8 *ucp; | |
327 | const u8 *sense = SRpnt->sense; | |
328 | ||
329 | s->have_sense = scsi_normalize_sense(SRpnt->sense, | |
330 | SCSI_SENSE_BUFFERSIZE, &s->sense_hdr); | |
331 | s->flags = 0; | |
332 | ||
333 | if (s->have_sense) { | |
334 | s->deferred = 0; | |
335 | s->remainder_valid = | |
336 | scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); | |
337 | switch (sense[0] & 0x7f) { | |
338 | case 0x71: | |
339 | s->deferred = 1; | |
340 | case 0x70: | |
341 | s->fixed_format = 1; | |
342 | s->flags = sense[2] & 0xe0; | |
343 | break; | |
344 | case 0x73: | |
345 | s->deferred = 1; | |
346 | case 0x72: | |
347 | s->fixed_format = 0; | |
348 | ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); | |
349 | s->flags = ucp ? (ucp[3] & 0xe0) : 0; | |
350 | break; | |
351 | } | |
352 | } | |
353 | } | |
354 | ||
355 | ||
356 | /* Convert the result to success code */ | |
357 | static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt) | |
358 | { | |
359 | int result = SRpnt->result; | |
360 | u8 scode; | |
361 | DEB(const char *stp;) | |
362 | char *name = tape_name(STp); | |
363 | struct st_cmdstatus *cmdstatp; | |
364 | ||
365 | if (!result) | |
366 | return 0; | |
367 | ||
368 | cmdstatp = &STp->buffer->cmdstat; | |
369 | st_analyze_sense(SRpnt, cmdstatp); | |
370 | ||
371 | if (cmdstatp->have_sense) | |
372 | scode = STp->buffer->cmdstat.sense_hdr.sense_key; | |
373 | else | |
374 | scode = 0; | |
375 | ||
376 | DEB( | |
377 | if (debugging) { | |
378 | st_printk(ST_DEB_MSG, STp, | |
379 | "Error: %x, cmd: %x %x %x %x %x %x\n", result, | |
380 | SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2], | |
381 | SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]); | |
382 | if (cmdstatp->have_sense) | |
383 | __scsi_print_sense(STp->device, name, | |
384 | SRpnt->sense, SCSI_SENSE_BUFFERSIZE); | |
385 | } ) /* end DEB */ | |
386 | if (!debugging) { /* Abnormal conditions for tape */ | |
387 | if (!cmdstatp->have_sense) | |
388 | st_printk(KERN_WARNING, STp, | |
389 | "Error %x (driver bt 0x%x, host bt 0x%x).\n", | |
390 | result, driver_byte(result), host_byte(result)); | |
391 | else if (cmdstatp->have_sense && | |
392 | scode != NO_SENSE && | |
393 | scode != RECOVERED_ERROR && | |
394 | /* scode != UNIT_ATTENTION && */ | |
395 | scode != BLANK_CHECK && | |
396 | scode != VOLUME_OVERFLOW && | |
397 | SRpnt->cmd[0] != MODE_SENSE && | |
398 | SRpnt->cmd[0] != TEST_UNIT_READY) { | |
399 | ||
400 | __scsi_print_sense(STp->device, name, | |
401 | SRpnt->sense, SCSI_SENSE_BUFFERSIZE); | |
402 | } | |
403 | } | |
404 | ||
405 | if (cmdstatp->fixed_format && | |
406 | STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ | |
407 | if (STp->cln_sense_value) | |
408 | STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & | |
409 | STp->cln_sense_mask) == STp->cln_sense_value); | |
410 | else | |
411 | STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & | |
412 | STp->cln_sense_mask) != 0); | |
413 | } | |
414 | if (cmdstatp->have_sense && | |
415 | cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17) | |
416 | STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */ | |
417 | ||
418 | STp->pos_unknown |= STp->device->was_reset; | |
419 | ||
420 | if (cmdstatp->have_sense && | |
421 | scode == RECOVERED_ERROR | |
422 | #if ST_RECOVERED_WRITE_FATAL | |
423 | && SRpnt->cmd[0] != WRITE_6 | |
424 | && SRpnt->cmd[0] != WRITE_FILEMARKS | |
425 | #endif | |
426 | ) { | |
427 | STp->recover_count++; | |
428 | STp->recover_reg++; | |
429 | ||
430 | DEB( | |
431 | if (debugging) { | |
432 | if (SRpnt->cmd[0] == READ_6) | |
433 | stp = "read"; | |
434 | else if (SRpnt->cmd[0] == WRITE_6) | |
435 | stp = "write"; | |
436 | else | |
437 | stp = "ioctl"; | |
438 | st_printk(ST_DEB_MSG, STp, | |
439 | "Recovered %s error (%d).\n", | |
440 | stp, STp->recover_count); | |
441 | } ) /* end DEB */ | |
442 | ||
443 | if (cmdstatp->flags == 0) | |
444 | return 0; | |
445 | } | |
446 | return (-EIO); | |
447 | } | |
448 | ||
449 | static struct st_request *st_allocate_request(struct scsi_tape *stp) | |
450 | { | |
451 | struct st_request *streq; | |
452 | ||
453 | streq = kzalloc(sizeof(*streq), GFP_KERNEL); | |
454 | if (streq) | |
455 | streq->stp = stp; | |
456 | else { | |
457 | st_printk(KERN_ERR, stp, | |
458 | "Can't get SCSI request.\n"); | |
459 | if (signal_pending(current)) | |
460 | stp->buffer->syscall_result = -EINTR; | |
461 | else | |
462 | stp->buffer->syscall_result = -EBUSY; | |
463 | } | |
464 | ||
465 | return streq; | |
466 | } | |
467 | ||
468 | static void st_release_request(struct st_request *streq) | |
469 | { | |
470 | kfree(streq); | |
471 | } | |
472 | ||
473 | static void st_do_stats(struct scsi_tape *STp, struct request *req) | |
474 | { | |
475 | ktime_t now; | |
476 | ||
477 | now = ktime_get(); | |
478 | if (req->cmd[0] == WRITE_6) { | |
479 | now = ktime_sub(now, STp->stats->write_time); | |
480 | atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time); | |
481 | atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); | |
482 | atomic64_inc(&STp->stats->write_cnt); | |
483 | if (req->errors) { | |
484 | atomic64_add(atomic_read(&STp->stats->last_write_size) | |
485 | - STp->buffer->cmdstat.residual, | |
486 | &STp->stats->write_byte_cnt); | |
487 | if (STp->buffer->cmdstat.residual > 0) | |
488 | atomic64_inc(&STp->stats->resid_cnt); | |
489 | } else | |
490 | atomic64_add(atomic_read(&STp->stats->last_write_size), | |
491 | &STp->stats->write_byte_cnt); | |
492 | } else if (req->cmd[0] == READ_6) { | |
493 | now = ktime_sub(now, STp->stats->read_time); | |
494 | atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time); | |
495 | atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); | |
496 | atomic64_inc(&STp->stats->read_cnt); | |
497 | if (req->errors) { | |
498 | atomic64_add(atomic_read(&STp->stats->last_read_size) | |
499 | - STp->buffer->cmdstat.residual, | |
500 | &STp->stats->read_byte_cnt); | |
501 | if (STp->buffer->cmdstat.residual > 0) | |
502 | atomic64_inc(&STp->stats->resid_cnt); | |
503 | } else | |
504 | atomic64_add(atomic_read(&STp->stats->last_read_size), | |
505 | &STp->stats->read_byte_cnt); | |
506 | } else { | |
507 | now = ktime_sub(now, STp->stats->other_time); | |
508 | atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); | |
509 | atomic64_inc(&STp->stats->other_cnt); | |
510 | } | |
511 | atomic64_dec(&STp->stats->in_flight); | |
512 | } | |
513 | ||
514 | static void st_scsi_execute_end(struct request *req, int uptodate) | |
515 | { | |
516 | struct st_request *SRpnt = req->end_io_data; | |
517 | struct scsi_tape *STp = SRpnt->stp; | |
518 | struct bio *tmp; | |
519 | ||
520 | STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors; | |
521 | STp->buffer->cmdstat.residual = req->resid_len; | |
522 | ||
523 | st_do_stats(STp, req); | |
524 | ||
525 | tmp = SRpnt->bio; | |
526 | if (SRpnt->waiting) | |
527 | complete(SRpnt->waiting); | |
528 | ||
529 | blk_rq_unmap_user(tmp); | |
530 | __blk_put_request(req->q, req); | |
531 | } | |
532 | ||
533 | static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, | |
534 | int data_direction, void *buffer, unsigned bufflen, | |
535 | int timeout, int retries) | |
536 | { | |
537 | struct request *req; | |
538 | struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data; | |
539 | int err = 0; | |
540 | int write = (data_direction == DMA_TO_DEVICE); | |
541 | struct scsi_tape *STp = SRpnt->stp; | |
542 | ||
543 | req = blk_get_request(SRpnt->stp->device->request_queue, write, | |
544 | GFP_KERNEL); | |
545 | if (IS_ERR(req)) | |
546 | return DRIVER_ERROR << 24; | |
547 | ||
548 | blk_rq_set_block_pc(req); | |
549 | req->rq_flags |= RQF_QUIET; | |
550 | ||
551 | mdata->null_mapped = 1; | |
552 | ||
553 | if (bufflen) { | |
554 | err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, | |
555 | GFP_KERNEL); | |
556 | if (err) { | |
557 | blk_put_request(req); | |
558 | return DRIVER_ERROR << 24; | |
559 | } | |
560 | } | |
561 | ||
562 | atomic64_inc(&STp->stats->in_flight); | |
563 | if (cmd[0] == WRITE_6) { | |
564 | atomic_set(&STp->stats->last_write_size, bufflen); | |
565 | STp->stats->write_time = ktime_get(); | |
566 | } else if (cmd[0] == READ_6) { | |
567 | atomic_set(&STp->stats->last_read_size, bufflen); | |
568 | STp->stats->read_time = ktime_get(); | |
569 | } else { | |
570 | STp->stats->other_time = ktime_get(); | |
571 | } | |
572 | ||
573 | SRpnt->bio = req->bio; | |
574 | req->cmd_len = COMMAND_SIZE(cmd[0]); | |
575 | memset(req->cmd, 0, BLK_MAX_CDB); | |
576 | memcpy(req->cmd, cmd, req->cmd_len); | |
577 | req->sense = SRpnt->sense; | |
578 | req->sense_len = 0; | |
579 | req->timeout = timeout; | |
580 | req->retries = retries; | |
581 | req->end_io_data = SRpnt; | |
582 | ||
583 | blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end); | |
584 | return 0; | |
585 | } | |
586 | ||
587 | /* Do the scsi command. Waits until command performed if do_wait is true. | |
588 | Otherwise write_behind_check() is used to check that the command | |
589 | has finished. */ | |
590 | static struct st_request * | |
591 | st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, | |
592 | int bytes, int direction, int timeout, int retries, int do_wait) | |
593 | { | |
594 | struct completion *waiting; | |
595 | struct rq_map_data *mdata = &STp->buffer->map_data; | |
596 | int ret; | |
597 | ||
598 | /* if async, make sure there's no command outstanding */ | |
599 | if (!do_wait && ((STp->buffer)->last_SRpnt)) { | |
600 | st_printk(KERN_ERR, STp, | |
601 | "Async command already active.\n"); | |
602 | if (signal_pending(current)) | |
603 | (STp->buffer)->syscall_result = (-EINTR); | |
604 | else | |
605 | (STp->buffer)->syscall_result = (-EBUSY); | |
606 | return NULL; | |
607 | } | |
608 | ||
609 | if (!SRpnt) { | |
610 | SRpnt = st_allocate_request(STp); | |
611 | if (!SRpnt) | |
612 | return NULL; | |
613 | } | |
614 | ||
615 | /* If async IO, set last_SRpnt. This ptr tells write_behind_check | |
616 | which IO is outstanding. It's nulled out when the IO completes. */ | |
617 | if (!do_wait) | |
618 | (STp->buffer)->last_SRpnt = SRpnt; | |
619 | ||
620 | waiting = &STp->wait; | |
621 | init_completion(waiting); | |
622 | SRpnt->waiting = waiting; | |
623 | ||
624 | if (STp->buffer->do_dio) { | |
625 | mdata->page_order = 0; | |
626 | mdata->nr_entries = STp->buffer->sg_segs; | |
627 | mdata->pages = STp->buffer->mapped_pages; | |
628 | } else { | |
629 | mdata->page_order = STp->buffer->reserved_page_order; | |
630 | mdata->nr_entries = | |
631 | DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order); | |
632 | mdata->pages = STp->buffer->reserved_pages; | |
633 | mdata->offset = 0; | |
634 | } | |
635 | ||
636 | memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd)); | |
637 | STp->buffer->cmdstat.have_sense = 0; | |
638 | STp->buffer->syscall_result = 0; | |
639 | ||
640 | ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout, | |
641 | retries); | |
642 | if (ret) { | |
643 | /* could not allocate the buffer or request was too large */ | |
644 | (STp->buffer)->syscall_result = (-EBUSY); | |
645 | (STp->buffer)->last_SRpnt = NULL; | |
646 | } else if (do_wait) { | |
647 | wait_for_completion(waiting); | |
648 | SRpnt->waiting = NULL; | |
649 | (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); | |
650 | } | |
651 | ||
652 | return SRpnt; | |
653 | } | |
654 | ||
655 | ||
656 | /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if | |
657 | write has been correct but EOM early warning reached, -EIO if write ended in | |
658 | error or zero if write successful. Asynchronous writes are used only in | |
659 | variable block mode. */ | |
660 | static int write_behind_check(struct scsi_tape * STp) | |
661 | { | |
662 | int retval = 0; | |
663 | struct st_buffer *STbuffer; | |
664 | struct st_partstat *STps; | |
665 | struct st_cmdstatus *cmdstatp; | |
666 | struct st_request *SRpnt; | |
667 | ||
668 | STbuffer = STp->buffer; | |
669 | if (!STbuffer->writing) | |
670 | return 0; | |
671 | ||
672 | DEB( | |
673 | if (STp->write_pending) | |
674 | STp->nbr_waits++; | |
675 | else | |
676 | STp->nbr_finished++; | |
677 | ) /* end DEB */ | |
678 | ||
679 | wait_for_completion(&(STp->wait)); | |
680 | SRpnt = STbuffer->last_SRpnt; | |
681 | STbuffer->last_SRpnt = NULL; | |
682 | SRpnt->waiting = NULL; | |
683 | ||
684 | (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); | |
685 | st_release_request(SRpnt); | |
686 | ||
687 | STbuffer->buffer_bytes -= STbuffer->writing; | |
688 | STps = &(STp->ps[STp->partition]); | |
689 | if (STps->drv_block >= 0) { | |
690 | if (STp->block_size == 0) | |
691 | STps->drv_block++; | |
692 | else | |
693 | STps->drv_block += STbuffer->writing / STp->block_size; | |
694 | } | |
695 | ||
696 | cmdstatp = &STbuffer->cmdstat; | |
697 | if (STbuffer->syscall_result) { | |
698 | retval = -EIO; | |
699 | if (cmdstatp->have_sense && !cmdstatp->deferred && | |
700 | (cmdstatp->flags & SENSE_EOM) && | |
701 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
702 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) { | |
703 | /* EOM at write-behind, has all data been written? */ | |
704 | if (!cmdstatp->remainder_valid || | |
705 | cmdstatp->uremainder64 == 0) | |
706 | retval = -ENOSPC; | |
707 | } | |
708 | if (retval == -EIO) | |
709 | STps->drv_block = -1; | |
710 | } | |
711 | STbuffer->writing = 0; | |
712 | ||
713 | DEB(if (debugging && retval) | |
714 | st_printk(ST_DEB_MSG, STp, | |
715 | "Async write error %x, return value %d.\n", | |
716 | STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */ | |
717 | ||
718 | return retval; | |
719 | } | |
720 | ||
721 | ||
722 | /* Step over EOF if it has been inadvertently crossed (ioctl not used because | |
723 | it messes up the block number). */ | |
724 | static int cross_eof(struct scsi_tape * STp, int forward) | |
725 | { | |
726 | struct st_request *SRpnt; | |
727 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
728 | ||
729 | cmd[0] = SPACE; | |
730 | cmd[1] = 0x01; /* Space FileMarks */ | |
731 | if (forward) { | |
732 | cmd[2] = cmd[3] = 0; | |
733 | cmd[4] = 1; | |
734 | } else | |
735 | cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ | |
736 | cmd[5] = 0; | |
737 | ||
738 | DEBC_printk(STp, "Stepping over filemark %s.\n", | |
739 | forward ? "forward" : "backward"); | |
740 | ||
741 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, | |
742 | STp->device->request_queue->rq_timeout, | |
743 | MAX_RETRIES, 1); | |
744 | if (!SRpnt) | |
745 | return (STp->buffer)->syscall_result; | |
746 | ||
747 | st_release_request(SRpnt); | |
748 | SRpnt = NULL; | |
749 | ||
750 | if ((STp->buffer)->cmdstat.midlevel_result != 0) | |
751 | st_printk(KERN_ERR, STp, | |
752 | "Stepping over filemark %s failed.\n", | |
753 | forward ? "forward" : "backward"); | |
754 | ||
755 | return (STp->buffer)->syscall_result; | |
756 | } | |
757 | ||
758 | ||
759 | /* Flush the write buffer (never need to write if variable blocksize). */ | |
760 | static int st_flush_write_buffer(struct scsi_tape * STp) | |
761 | { | |
762 | int transfer, blks; | |
763 | int result; | |
764 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
765 | struct st_request *SRpnt; | |
766 | struct st_partstat *STps; | |
767 | ||
768 | result = write_behind_check(STp); | |
769 | if (result) | |
770 | return result; | |
771 | ||
772 | result = 0; | |
773 | if (STp->dirty == 1) { | |
774 | ||
775 | transfer = STp->buffer->buffer_bytes; | |
776 | DEBC_printk(STp, "Flushing %d bytes.\n", transfer); | |
777 | ||
778 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
779 | cmd[0] = WRITE_6; | |
780 | cmd[1] = 1; | |
781 | blks = transfer / STp->block_size; | |
782 | cmd[2] = blks >> 16; | |
783 | cmd[3] = blks >> 8; | |
784 | cmd[4] = blks; | |
785 | ||
786 | SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE, | |
787 | STp->device->request_queue->rq_timeout, | |
788 | MAX_WRITE_RETRIES, 1); | |
789 | if (!SRpnt) | |
790 | return (STp->buffer)->syscall_result; | |
791 | ||
792 | STps = &(STp->ps[STp->partition]); | |
793 | if ((STp->buffer)->syscall_result != 0) { | |
794 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
795 | ||
796 | if (cmdstatp->have_sense && !cmdstatp->deferred && | |
797 | (cmdstatp->flags & SENSE_EOM) && | |
798 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
799 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && | |
800 | (!cmdstatp->remainder_valid || | |
801 | cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */ | |
802 | STp->dirty = 0; | |
803 | (STp->buffer)->buffer_bytes = 0; | |
804 | if (STps->drv_block >= 0) | |
805 | STps->drv_block += blks; | |
806 | result = (-ENOSPC); | |
807 | } else { | |
808 | st_printk(KERN_ERR, STp, "Error on flush.\n"); | |
809 | STps->drv_block = (-1); | |
810 | result = (-EIO); | |
811 | } | |
812 | } else { | |
813 | if (STps->drv_block >= 0) | |
814 | STps->drv_block += blks; | |
815 | STp->dirty = 0; | |
816 | (STp->buffer)->buffer_bytes = 0; | |
817 | } | |
818 | st_release_request(SRpnt); | |
819 | SRpnt = NULL; | |
820 | } | |
821 | return result; | |
822 | } | |
823 | ||
824 | ||
825 | /* Flush the tape buffer. The tape will be positioned correctly unless | |
826 | seek_next is true. */ | |
827 | static int flush_buffer(struct scsi_tape *STp, int seek_next) | |
828 | { | |
829 | int backspace, result; | |
830 | struct st_buffer *STbuffer; | |
831 | struct st_partstat *STps; | |
832 | ||
833 | STbuffer = STp->buffer; | |
834 | ||
835 | /* | |
836 | * If there was a bus reset, block further access | |
837 | * to this device. | |
838 | */ | |
839 | if (STp->pos_unknown) | |
840 | return (-EIO); | |
841 | ||
842 | if (STp->ready != ST_READY) | |
843 | return 0; | |
844 | STps = &(STp->ps[STp->partition]); | |
845 | if (STps->rw == ST_WRITING) /* Writing */ | |
846 | return st_flush_write_buffer(STp); | |
847 | ||
848 | if (STp->block_size == 0) | |
849 | return 0; | |
850 | ||
851 | backspace = ((STp->buffer)->buffer_bytes + | |
852 | (STp->buffer)->read_pointer) / STp->block_size - | |
853 | ((STp->buffer)->read_pointer + STp->block_size - 1) / | |
854 | STp->block_size; | |
855 | (STp->buffer)->buffer_bytes = 0; | |
856 | (STp->buffer)->read_pointer = 0; | |
857 | result = 0; | |
858 | if (!seek_next) { | |
859 | if (STps->eof == ST_FM_HIT) { | |
860 | result = cross_eof(STp, 0); /* Back over the EOF hit */ | |
861 | if (!result) | |
862 | STps->eof = ST_NOEOF; | |
863 | else { | |
864 | if (STps->drv_file >= 0) | |
865 | STps->drv_file++; | |
866 | STps->drv_block = 0; | |
867 | } | |
868 | } | |
869 | if (!result && backspace > 0) | |
870 | result = st_int_ioctl(STp, MTBSR, backspace); | |
871 | } else if (STps->eof == ST_FM_HIT) { | |
872 | if (STps->drv_file >= 0) | |
873 | STps->drv_file++; | |
874 | STps->drv_block = 0; | |
875 | STps->eof = ST_NOEOF; | |
876 | } | |
877 | return result; | |
878 | ||
879 | } | |
880 | \f | |
881 | /* Set the mode parameters */ | |
882 | static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm) | |
883 | { | |
884 | int set_it = 0; | |
885 | unsigned long arg; | |
886 | ||
887 | if (!STp->density_changed && | |
888 | STm->default_density >= 0 && | |
889 | STm->default_density != STp->density) { | |
890 | arg = STm->default_density; | |
891 | set_it = 1; | |
892 | } else | |
893 | arg = STp->density; | |
894 | arg <<= MT_ST_DENSITY_SHIFT; | |
895 | if (!STp->blksize_changed && | |
896 | STm->default_blksize >= 0 && | |
897 | STm->default_blksize != STp->block_size) { | |
898 | arg |= STm->default_blksize; | |
899 | set_it = 1; | |
900 | } else | |
901 | arg |= STp->block_size; | |
902 | if (set_it && | |
903 | st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) { | |
904 | st_printk(KERN_WARNING, STp, | |
905 | "Can't set default block size to %d bytes " | |
906 | "and density %x.\n", | |
907 | STm->default_blksize, STm->default_density); | |
908 | if (modes_defined) | |
909 | return (-EINVAL); | |
910 | } | |
911 | return 0; | |
912 | } | |
913 | ||
914 | ||
915 | /* Lock or unlock the drive door. Don't use when st_request allocated. */ | |
916 | static int do_door_lock(struct scsi_tape * STp, int do_lock) | |
917 | { | |
918 | int retval; | |
919 | ||
920 | DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl"); | |
921 | ||
922 | retval = scsi_set_medium_removal(STp->device, | |
923 | do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW); | |
924 | if (!retval) | |
925 | STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; | |
926 | else | |
927 | STp->door_locked = ST_LOCK_FAILS; | |
928 | return retval; | |
929 | } | |
930 | ||
931 | ||
932 | /* Set the internal state after reset */ | |
933 | static void reset_state(struct scsi_tape *STp) | |
934 | { | |
935 | int i; | |
936 | struct st_partstat *STps; | |
937 | ||
938 | STp->pos_unknown = 0; | |
939 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
940 | STps = &(STp->ps[i]); | |
941 | STps->rw = ST_IDLE; | |
942 | STps->eof = ST_NOEOF; | |
943 | STps->at_sm = 0; | |
944 | STps->last_block_valid = 0; | |
945 | STps->drv_block = -1; | |
946 | STps->drv_file = -1; | |
947 | } | |
948 | if (STp->can_partitions) { | |
949 | STp->partition = find_partition(STp); | |
950 | if (STp->partition < 0) | |
951 | STp->partition = 0; | |
952 | STp->new_partition = STp->partition; | |
953 | } | |
954 | } | |
955 | \f | |
956 | /* Test if the drive is ready. Returns either one of the codes below or a negative system | |
957 | error code. */ | |
958 | #define CHKRES_READY 0 | |
959 | #define CHKRES_NEW_SESSION 1 | |
960 | #define CHKRES_NOT_READY 2 | |
961 | #define CHKRES_NO_TAPE 3 | |
962 | ||
963 | #define MAX_ATTENTIONS 10 | |
964 | ||
965 | static int test_ready(struct scsi_tape *STp, int do_wait) | |
966 | { | |
967 | int attentions, waits, max_wait, scode; | |
968 | int retval = CHKRES_READY, new_session = 0; | |
969 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
970 | struct st_request *SRpnt = NULL; | |
971 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
972 | ||
973 | max_wait = do_wait ? ST_BLOCK_SECONDS : 0; | |
974 | ||
975 | for (attentions=waits=0; ; ) { | |
976 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
977 | cmd[0] = TEST_UNIT_READY; | |
978 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, | |
979 | STp->long_timeout, MAX_READY_RETRIES, 1); | |
980 | ||
981 | if (!SRpnt) { | |
982 | retval = (STp->buffer)->syscall_result; | |
983 | break; | |
984 | } | |
985 | ||
986 | if (cmdstatp->have_sense) { | |
987 | ||
988 | scode = cmdstatp->sense_hdr.sense_key; | |
989 | ||
990 | if (scode == UNIT_ATTENTION) { /* New media? */ | |
991 | new_session = 1; | |
992 | if (attentions < MAX_ATTENTIONS) { | |
993 | attentions++; | |
994 | continue; | |
995 | } | |
996 | else { | |
997 | retval = (-EIO); | |
998 | break; | |
999 | } | |
1000 | } | |
1001 | ||
1002 | if (scode == NOT_READY) { | |
1003 | if (waits < max_wait) { | |
1004 | if (msleep_interruptible(1000)) { | |
1005 | retval = (-EINTR); | |
1006 | break; | |
1007 | } | |
1008 | waits++; | |
1009 | continue; | |
1010 | } | |
1011 | else { | |
1012 | if ((STp->device)->scsi_level >= SCSI_2 && | |
1013 | cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */ | |
1014 | retval = CHKRES_NO_TAPE; | |
1015 | else | |
1016 | retval = CHKRES_NOT_READY; | |
1017 | break; | |
1018 | } | |
1019 | } | |
1020 | } | |
1021 | ||
1022 | retval = (STp->buffer)->syscall_result; | |
1023 | if (!retval) | |
1024 | retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY; | |
1025 | break; | |
1026 | } | |
1027 | ||
1028 | if (SRpnt != NULL) | |
1029 | st_release_request(SRpnt); | |
1030 | return retval; | |
1031 | } | |
1032 | ||
1033 | ||
1034 | /* See if the drive is ready and gather information about the tape. Return values: | |
1035 | < 0 negative error code from errno.h | |
1036 | 0 drive ready | |
1037 | 1 drive not ready (possibly no tape) | |
1038 | */ | |
1039 | static int check_tape(struct scsi_tape *STp, struct file *filp) | |
1040 | { | |
1041 | int i, retval, new_session = 0, do_wait; | |
1042 | unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning; | |
1043 | unsigned short st_flags = filp->f_flags; | |
1044 | struct st_request *SRpnt = NULL; | |
1045 | struct st_modedef *STm; | |
1046 | struct st_partstat *STps; | |
1047 | struct inode *inode = file_inode(filp); | |
1048 | int mode = TAPE_MODE(inode); | |
1049 | ||
1050 | STp->ready = ST_READY; | |
1051 | ||
1052 | if (mode != STp->current_mode) { | |
1053 | DEBC_printk(STp, "Mode change from %d to %d.\n", | |
1054 | STp->current_mode, mode); | |
1055 | new_session = 1; | |
1056 | STp->current_mode = mode; | |
1057 | } | |
1058 | STm = &(STp->modes[STp->current_mode]); | |
1059 | ||
1060 | saved_cleaning = STp->cleaning_req; | |
1061 | STp->cleaning_req = 0; | |
1062 | ||
1063 | do_wait = ((filp->f_flags & O_NONBLOCK) == 0); | |
1064 | retval = test_ready(STp, do_wait); | |
1065 | ||
1066 | if (retval < 0) | |
1067 | goto err_out; | |
1068 | ||
1069 | if (retval == CHKRES_NEW_SESSION) { | |
1070 | STp->pos_unknown = 0; | |
1071 | STp->partition = STp->new_partition = 0; | |
1072 | if (STp->can_partitions) | |
1073 | STp->nbr_partitions = 1; /* This guess will be updated later | |
1074 | if necessary */ | |
1075 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
1076 | STps = &(STp->ps[i]); | |
1077 | STps->rw = ST_IDLE; | |
1078 | STps->eof = ST_NOEOF; | |
1079 | STps->at_sm = 0; | |
1080 | STps->last_block_valid = 0; | |
1081 | STps->drv_block = 0; | |
1082 | STps->drv_file = 0; | |
1083 | } | |
1084 | new_session = 1; | |
1085 | } | |
1086 | else { | |
1087 | STp->cleaning_req |= saved_cleaning; | |
1088 | ||
1089 | if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) { | |
1090 | if (retval == CHKRES_NO_TAPE) | |
1091 | STp->ready = ST_NO_TAPE; | |
1092 | else | |
1093 | STp->ready = ST_NOT_READY; | |
1094 | ||
1095 | STp->density = 0; /* Clear the erroneous "residue" */ | |
1096 | STp->write_prot = 0; | |
1097 | STp->block_size = 0; | |
1098 | STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); | |
1099 | STp->partition = STp->new_partition = 0; | |
1100 | STp->door_locked = ST_UNLOCKED; | |
1101 | return CHKRES_NOT_READY; | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | if (STp->omit_blklims) | |
1106 | STp->min_block = STp->max_block = (-1); | |
1107 | else { | |
1108 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
1109 | cmd[0] = READ_BLOCK_LIMITS; | |
1110 | ||
1111 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, | |
1112 | STp->device->request_queue->rq_timeout, | |
1113 | MAX_READY_RETRIES, 1); | |
1114 | if (!SRpnt) { | |
1115 | retval = (STp->buffer)->syscall_result; | |
1116 | goto err_out; | |
1117 | } | |
1118 | ||
1119 | if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) { | |
1120 | STp->max_block = ((STp->buffer)->b_data[1] << 16) | | |
1121 | ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; | |
1122 | STp->min_block = ((STp->buffer)->b_data[4] << 8) | | |
1123 | (STp->buffer)->b_data[5]; | |
1124 | if ( DEB( debugging || ) !STp->inited) | |
1125 | st_printk(KERN_INFO, STp, | |
1126 | "Block limits %d - %d bytes.\n", | |
1127 | STp->min_block, STp->max_block); | |
1128 | } else { | |
1129 | STp->min_block = STp->max_block = (-1); | |
1130 | DEBC_printk(STp, "Can't read block limits.\n"); | |
1131 | } | |
1132 | } | |
1133 | ||
1134 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
1135 | cmd[0] = MODE_SENSE; | |
1136 | cmd[4] = 12; | |
1137 | ||
1138 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, | |
1139 | STp->device->request_queue->rq_timeout, | |
1140 | MAX_READY_RETRIES, 1); | |
1141 | if (!SRpnt) { | |
1142 | retval = (STp->buffer)->syscall_result; | |
1143 | goto err_out; | |
1144 | } | |
1145 | ||
1146 | if ((STp->buffer)->syscall_result != 0) { | |
1147 | DEBC_printk(STp, "No Mode Sense.\n"); | |
1148 | STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ | |
1149 | (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ | |
1150 | STp->drv_write_prot = 0; | |
1151 | } else { | |
1152 | DEBC_printk(STp,"Mode sense. Length %d, " | |
1153 | "medium %x, WBS %x, BLL %d\n", | |
1154 | (STp->buffer)->b_data[0], | |
1155 | (STp->buffer)->b_data[1], | |
1156 | (STp->buffer)->b_data[2], | |
1157 | (STp->buffer)->b_data[3]); | |
1158 | ||
1159 | if ((STp->buffer)->b_data[3] >= 8) { | |
1160 | STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; | |
1161 | STp->density = (STp->buffer)->b_data[4]; | |
1162 | STp->block_size = (STp->buffer)->b_data[9] * 65536 + | |
1163 | (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; | |
1164 | DEBC_printk(STp, "Density %x, tape length: %x, " | |
1165 | "drv buffer: %d\n", | |
1166 | STp->density, | |
1167 | (STp->buffer)->b_data[5] * 65536 + | |
1168 | (STp->buffer)->b_data[6] * 256 + | |
1169 | (STp->buffer)->b_data[7], | |
1170 | STp->drv_buffer); | |
1171 | } | |
1172 | STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; | |
1173 | if (!STp->drv_buffer && STp->immediate_filemark) { | |
1174 | st_printk(KERN_WARNING, STp, | |
1175 | "non-buffered tape: disabling " | |
1176 | "writing immediate filemarks\n"); | |
1177 | STp->immediate_filemark = 0; | |
1178 | } | |
1179 | } | |
1180 | st_release_request(SRpnt); | |
1181 | SRpnt = NULL; | |
1182 | STp->inited = 1; | |
1183 | ||
1184 | if (STp->block_size > 0) | |
1185 | (STp->buffer)->buffer_blocks = | |
1186 | (STp->buffer)->buffer_size / STp->block_size; | |
1187 | else | |
1188 | (STp->buffer)->buffer_blocks = 1; | |
1189 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; | |
1190 | ||
1191 | DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n", | |
1192 | STp->block_size, (STp->buffer)->buffer_size, | |
1193 | (STp->buffer)->buffer_blocks); | |
1194 | ||
1195 | if (STp->drv_write_prot) { | |
1196 | STp->write_prot = 1; | |
1197 | ||
1198 | DEBC_printk(STp, "Write protected\n"); | |
1199 | ||
1200 | if (do_wait && | |
1201 | ((st_flags & O_ACCMODE) == O_WRONLY || | |
1202 | (st_flags & O_ACCMODE) == O_RDWR)) { | |
1203 | retval = (-EROFS); | |
1204 | goto err_out; | |
1205 | } | |
1206 | } | |
1207 | ||
1208 | if (STp->can_partitions && STp->nbr_partitions < 1) { | |
1209 | /* This code is reached when the device is opened for the first time | |
1210 | after the driver has been initialized with tape in the drive and the | |
1211 | partition support has been enabled. */ | |
1212 | DEBC_printk(STp, "Updating partition number in status.\n"); | |
1213 | if ((STp->partition = find_partition(STp)) < 0) { | |
1214 | retval = STp->partition; | |
1215 | goto err_out; | |
1216 | } | |
1217 | STp->new_partition = STp->partition; | |
1218 | STp->nbr_partitions = 1; /* This guess will be updated when necessary */ | |
1219 | } | |
1220 | ||
1221 | if (new_session) { /* Change the drive parameters for the new mode */ | |
1222 | STp->density_changed = STp->blksize_changed = 0; | |
1223 | STp->compression_changed = 0; | |
1224 | if (!(STm->defaults_for_writes) && | |
1225 | (retval = set_mode_densblk(STp, STm)) < 0) | |
1226 | goto err_out; | |
1227 | ||
1228 | if (STp->default_drvbuffer != 0xff) { | |
1229 | if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer)) | |
1230 | st_printk(KERN_WARNING, STp, | |
1231 | "Can't set default drive " | |
1232 | "buffering to %d.\n", | |
1233 | STp->default_drvbuffer); | |
1234 | } | |
1235 | } | |
1236 | ||
1237 | return CHKRES_READY; | |
1238 | ||
1239 | err_out: | |
1240 | return retval; | |
1241 | } | |
1242 | ||
1243 | ||
1244 | \f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host | |
1245 | module count. */ | |
1246 | static int st_open(struct inode *inode, struct file *filp) | |
1247 | { | |
1248 | int i, retval = (-EIO); | |
1249 | int resumed = 0; | |
1250 | struct scsi_tape *STp; | |
1251 | struct st_partstat *STps; | |
1252 | int dev = TAPE_NR(inode); | |
1253 | ||
1254 | /* | |
1255 | * We really want to do nonseekable_open(inode, filp); here, but some | |
1256 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
1257 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
1258 | */ | |
1259 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
1260 | ||
1261 | if (!(STp = scsi_tape_get(dev))) { | |
1262 | return -ENXIO; | |
1263 | } | |
1264 | ||
1265 | filp->private_data = STp; | |
1266 | ||
1267 | spin_lock(&st_use_lock); | |
1268 | if (STp->in_use) { | |
1269 | spin_unlock(&st_use_lock); | |
1270 | scsi_tape_put(STp); | |
1271 | DEBC_printk(STp, "Device already in use.\n"); | |
1272 | return (-EBUSY); | |
1273 | } | |
1274 | ||
1275 | STp->in_use = 1; | |
1276 | spin_unlock(&st_use_lock); | |
1277 | STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; | |
1278 | ||
1279 | if (scsi_autopm_get_device(STp->device) < 0) { | |
1280 | retval = -EIO; | |
1281 | goto err_out; | |
1282 | } | |
1283 | resumed = 1; | |
1284 | if (!scsi_block_when_processing_errors(STp->device)) { | |
1285 | retval = (-ENXIO); | |
1286 | goto err_out; | |
1287 | } | |
1288 | ||
1289 | /* See that we have at least a one page buffer available */ | |
1290 | if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) { | |
1291 | st_printk(KERN_WARNING, STp, | |
1292 | "Can't allocate one page tape buffer.\n"); | |
1293 | retval = (-EOVERFLOW); | |
1294 | goto err_out; | |
1295 | } | |
1296 | ||
1297 | (STp->buffer)->cleared = 0; | |
1298 | (STp->buffer)->writing = 0; | |
1299 | (STp->buffer)->syscall_result = 0; | |
1300 | ||
1301 | STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY); | |
1302 | ||
1303 | STp->dirty = 0; | |
1304 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
1305 | STps = &(STp->ps[i]); | |
1306 | STps->rw = ST_IDLE; | |
1307 | } | |
1308 | STp->try_dio_now = STp->try_dio; | |
1309 | STp->recover_count = 0; | |
1310 | DEB( STp->nbr_waits = STp->nbr_finished = 0; | |
1311 | STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; ) | |
1312 | ||
1313 | retval = check_tape(STp, filp); | |
1314 | if (retval < 0) | |
1315 | goto err_out; | |
1316 | if ((filp->f_flags & O_NONBLOCK) == 0 && | |
1317 | retval != CHKRES_READY) { | |
1318 | if (STp->ready == NO_TAPE) | |
1319 | retval = (-ENOMEDIUM); | |
1320 | else | |
1321 | retval = (-EIO); | |
1322 | goto err_out; | |
1323 | } | |
1324 | return 0; | |
1325 | ||
1326 | err_out: | |
1327 | normalize_buffer(STp->buffer); | |
1328 | spin_lock(&st_use_lock); | |
1329 | STp->in_use = 0; | |
1330 | spin_unlock(&st_use_lock); | |
1331 | if (resumed) | |
1332 | scsi_autopm_put_device(STp->device); | |
1333 | scsi_tape_put(STp); | |
1334 | return retval; | |
1335 | ||
1336 | } | |
1337 | \f | |
1338 | ||
1339 | /* Flush the tape buffer before close */ | |
1340 | static int st_flush(struct file *filp, fl_owner_t id) | |
1341 | { | |
1342 | int result = 0, result2; | |
1343 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
1344 | struct st_request *SRpnt; | |
1345 | struct scsi_tape *STp = filp->private_data; | |
1346 | struct st_modedef *STm = &(STp->modes[STp->current_mode]); | |
1347 | struct st_partstat *STps = &(STp->ps[STp->partition]); | |
1348 | ||
1349 | if (file_count(filp) > 1) | |
1350 | return 0; | |
1351 | ||
1352 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { | |
1353 | result = st_flush_write_buffer(STp); | |
1354 | if (result != 0 && result != (-ENOSPC)) | |
1355 | goto out; | |
1356 | } | |
1357 | ||
1358 | if (STp->can_partitions && | |
1359 | (result2 = switch_partition(STp)) < 0) { | |
1360 | DEBC_printk(STp, "switch_partition at close failed.\n"); | |
1361 | if (result == 0) | |
1362 | result = result2; | |
1363 | goto out; | |
1364 | } | |
1365 | ||
1366 | DEBC( if (STp->nbr_requests) | |
1367 | st_printk(KERN_DEBUG, STp, | |
1368 | "Number of r/w requests %d, dio used in %d, " | |
1369 | "pages %d.\n", STp->nbr_requests, STp->nbr_dio, | |
1370 | STp->nbr_pages)); | |
1371 | ||
1372 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { | |
1373 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1374 | ||
1375 | #if DEBUG | |
1376 | DEBC_printk(STp, "Async write waits %d, finished %d.\n", | |
1377 | STp->nbr_waits, STp->nbr_finished); | |
1378 | #endif | |
1379 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1380 | cmd[0] = WRITE_FILEMARKS; | |
1381 | if (STp->immediate_filemark) | |
1382 | cmd[1] = 1; | |
1383 | cmd[4] = 1 + STp->two_fm; | |
1384 | ||
1385 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, | |
1386 | STp->device->request_queue->rq_timeout, | |
1387 | MAX_WRITE_RETRIES, 1); | |
1388 | if (!SRpnt) { | |
1389 | result = (STp->buffer)->syscall_result; | |
1390 | goto out; | |
1391 | } | |
1392 | ||
1393 | if (STp->buffer->syscall_result == 0 || | |
1394 | (cmdstatp->have_sense && !cmdstatp->deferred && | |
1395 | (cmdstatp->flags & SENSE_EOM) && | |
1396 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
1397 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && | |
1398 | (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) { | |
1399 | /* Write successful at EOM */ | |
1400 | st_release_request(SRpnt); | |
1401 | SRpnt = NULL; | |
1402 | if (STps->drv_file >= 0) | |
1403 | STps->drv_file++; | |
1404 | STps->drv_block = 0; | |
1405 | if (STp->two_fm) | |
1406 | cross_eof(STp, 0); | |
1407 | STps->eof = ST_FM; | |
1408 | } | |
1409 | else { /* Write error */ | |
1410 | st_release_request(SRpnt); | |
1411 | SRpnt = NULL; | |
1412 | st_printk(KERN_ERR, STp, | |
1413 | "Error on write filemark.\n"); | |
1414 | if (result == 0) | |
1415 | result = (-EIO); | |
1416 | } | |
1417 | ||
1418 | DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]); | |
1419 | } else if (!STp->rew_at_close) { | |
1420 | STps = &(STp->ps[STp->partition]); | |
1421 | if (!STm->sysv || STps->rw != ST_READING) { | |
1422 | if (STp->can_bsr) | |
1423 | result = flush_buffer(STp, 0); | |
1424 | else if (STps->eof == ST_FM_HIT) { | |
1425 | result = cross_eof(STp, 0); | |
1426 | if (result) { | |
1427 | if (STps->drv_file >= 0) | |
1428 | STps->drv_file++; | |
1429 | STps->drv_block = 0; | |
1430 | STps->eof = ST_FM; | |
1431 | } else | |
1432 | STps->eof = ST_NOEOF; | |
1433 | } | |
1434 | } else if ((STps->eof == ST_NOEOF && | |
1435 | !(result = cross_eof(STp, 1))) || | |
1436 | STps->eof == ST_FM_HIT) { | |
1437 | if (STps->drv_file >= 0) | |
1438 | STps->drv_file++; | |
1439 | STps->drv_block = 0; | |
1440 | STps->eof = ST_FM; | |
1441 | } | |
1442 | } | |
1443 | ||
1444 | out: | |
1445 | if (STp->rew_at_close) { | |
1446 | result2 = st_int_ioctl(STp, MTREW, 1); | |
1447 | if (result == 0) | |
1448 | result = result2; | |
1449 | } | |
1450 | return result; | |
1451 | } | |
1452 | ||
1453 | ||
1454 | /* Close the device and release it. BKL is not needed: this is the only thread | |
1455 | accessing this tape. */ | |
1456 | static int st_release(struct inode *inode, struct file *filp) | |
1457 | { | |
1458 | int result = 0; | |
1459 | struct scsi_tape *STp = filp->private_data; | |
1460 | ||
1461 | if (STp->door_locked == ST_LOCKED_AUTO) | |
1462 | do_door_lock(STp, 0); | |
1463 | ||
1464 | normalize_buffer(STp->buffer); | |
1465 | spin_lock(&st_use_lock); | |
1466 | STp->in_use = 0; | |
1467 | spin_unlock(&st_use_lock); | |
1468 | scsi_autopm_put_device(STp->device); | |
1469 | scsi_tape_put(STp); | |
1470 | ||
1471 | return result; | |
1472 | } | |
1473 | \f | |
1474 | /* The checks common to both reading and writing */ | |
1475 | static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count) | |
1476 | { | |
1477 | ssize_t retval = 0; | |
1478 | ||
1479 | /* | |
1480 | * If we are in the middle of error recovery, don't let anyone | |
1481 | * else try and use this device. Also, if error recovery fails, it | |
1482 | * may try and take the device offline, in which case all further | |
1483 | * access to the device is prohibited. | |
1484 | */ | |
1485 | if (!scsi_block_when_processing_errors(STp->device)) { | |
1486 | retval = (-ENXIO); | |
1487 | goto out; | |
1488 | } | |
1489 | ||
1490 | if (STp->ready != ST_READY) { | |
1491 | if (STp->ready == ST_NO_TAPE) | |
1492 | retval = (-ENOMEDIUM); | |
1493 | else | |
1494 | retval = (-EIO); | |
1495 | goto out; | |
1496 | } | |
1497 | ||
1498 | if (! STp->modes[STp->current_mode].defined) { | |
1499 | retval = (-ENXIO); | |
1500 | goto out; | |
1501 | } | |
1502 | ||
1503 | ||
1504 | /* | |
1505 | * If there was a bus reset, block further access | |
1506 | * to this device. | |
1507 | */ | |
1508 | if (STp->pos_unknown) { | |
1509 | retval = (-EIO); | |
1510 | goto out; | |
1511 | } | |
1512 | ||
1513 | if (count == 0) | |
1514 | goto out; | |
1515 | ||
1516 | DEB( | |
1517 | if (!STp->in_use) { | |
1518 | st_printk(ST_DEB_MSG, STp, | |
1519 | "Incorrect device.\n"); | |
1520 | retval = (-EIO); | |
1521 | goto out; | |
1522 | } ) /* end DEB */ | |
1523 | ||
1524 | if (STp->can_partitions && | |
1525 | (retval = switch_partition(STp)) < 0) | |
1526 | goto out; | |
1527 | ||
1528 | if (STp->block_size == 0 && STp->max_block > 0 && | |
1529 | (count < STp->min_block || count > STp->max_block)) { | |
1530 | retval = (-EINVAL); | |
1531 | goto out; | |
1532 | } | |
1533 | ||
1534 | if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && | |
1535 | !do_door_lock(STp, 1)) | |
1536 | STp->door_locked = ST_LOCKED_AUTO; | |
1537 | ||
1538 | out: | |
1539 | return retval; | |
1540 | } | |
1541 | ||
1542 | ||
1543 | static int setup_buffering(struct scsi_tape *STp, const char __user *buf, | |
1544 | size_t count, int is_read) | |
1545 | { | |
1546 | int i, bufsize, retval = 0; | |
1547 | struct st_buffer *STbp = STp->buffer; | |
1548 | ||
1549 | if (is_read) | |
1550 | i = STp->try_dio_now && try_rdio; | |
1551 | else | |
1552 | i = STp->try_dio_now && try_wdio; | |
1553 | ||
1554 | if (i && ((unsigned long)buf & queue_dma_alignment( | |
1555 | STp->device->request_queue)) == 0) { | |
1556 | i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf, | |
1557 | count, (is_read ? READ : WRITE)); | |
1558 | if (i > 0) { | |
1559 | STbp->do_dio = i; | |
1560 | STbp->buffer_bytes = 0; /* can be used as transfer counter */ | |
1561 | } | |
1562 | else | |
1563 | STbp->do_dio = 0; /* fall back to buffering with any error */ | |
1564 | STbp->sg_segs = STbp->do_dio; | |
1565 | DEB( | |
1566 | if (STbp->do_dio) { | |
1567 | STp->nbr_dio++; | |
1568 | STp->nbr_pages += STbp->do_dio; | |
1569 | } | |
1570 | ) | |
1571 | } else | |
1572 | STbp->do_dio = 0; | |
1573 | DEB( STp->nbr_requests++; ) | |
1574 | ||
1575 | if (!STbp->do_dio) { | |
1576 | if (STp->block_size) | |
1577 | bufsize = STp->block_size > st_fixed_buffer_size ? | |
1578 | STp->block_size : st_fixed_buffer_size; | |
1579 | else { | |
1580 | bufsize = count; | |
1581 | /* Make sure that data from previous user is not leaked even if | |
1582 | HBA does not return correct residual */ | |
1583 | if (is_read && STp->sili && !STbp->cleared) | |
1584 | clear_buffer(STbp); | |
1585 | } | |
1586 | ||
1587 | if (bufsize > STbp->buffer_size && | |
1588 | !enlarge_buffer(STbp, bufsize, STp->restr_dma)) { | |
1589 | st_printk(KERN_WARNING, STp, | |
1590 | "Can't allocate %d byte tape buffer.\n", | |
1591 | bufsize); | |
1592 | retval = (-EOVERFLOW); | |
1593 | goto out; | |
1594 | } | |
1595 | if (STp->block_size) | |
1596 | STbp->buffer_blocks = bufsize / STp->block_size; | |
1597 | } | |
1598 | ||
1599 | out: | |
1600 | return retval; | |
1601 | } | |
1602 | ||
1603 | ||
1604 | /* Can be called more than once after each setup_buffer() */ | |
1605 | static void release_buffering(struct scsi_tape *STp, int is_read) | |
1606 | { | |
1607 | struct st_buffer *STbp; | |
1608 | ||
1609 | STbp = STp->buffer; | |
1610 | if (STbp->do_dio) { | |
1611 | sgl_unmap_user_pages(STbp, STbp->do_dio, is_read); | |
1612 | STbp->do_dio = 0; | |
1613 | STbp->sg_segs = 0; | |
1614 | } | |
1615 | } | |
1616 | ||
1617 | ||
1618 | /* Write command */ | |
1619 | static ssize_t | |
1620 | st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
1621 | { | |
1622 | ssize_t total; | |
1623 | ssize_t i, do_count, blks, transfer; | |
1624 | ssize_t retval; | |
1625 | int undone, retry_eot = 0, scode; | |
1626 | int async_write; | |
1627 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
1628 | const char __user *b_point; | |
1629 | struct st_request *SRpnt = NULL; | |
1630 | struct scsi_tape *STp = filp->private_data; | |
1631 | struct st_modedef *STm; | |
1632 | struct st_partstat *STps; | |
1633 | struct st_buffer *STbp; | |
1634 | ||
1635 | if (mutex_lock_interruptible(&STp->lock)) | |
1636 | return -ERESTARTSYS; | |
1637 | ||
1638 | retval = rw_checks(STp, filp, count); | |
1639 | if (retval || count == 0) | |
1640 | goto out; | |
1641 | ||
1642 | /* Write must be integral number of blocks */ | |
1643 | if (STp->block_size != 0 && (count % STp->block_size) != 0) { | |
1644 | st_printk(KERN_WARNING, STp, | |
1645 | "Write not multiple of tape block size.\n"); | |
1646 | retval = (-EINVAL); | |
1647 | goto out; | |
1648 | } | |
1649 | ||
1650 | STm = &(STp->modes[STp->current_mode]); | |
1651 | STps = &(STp->ps[STp->partition]); | |
1652 | ||
1653 | if (STp->write_prot) { | |
1654 | retval = (-EACCES); | |
1655 | goto out; | |
1656 | } | |
1657 | ||
1658 | ||
1659 | if (STps->rw == ST_READING) { | |
1660 | retval = flush_buffer(STp, 0); | |
1661 | if (retval) | |
1662 | goto out; | |
1663 | STps->rw = ST_WRITING; | |
1664 | } else if (STps->rw != ST_WRITING && | |
1665 | STps->drv_file == 0 && STps->drv_block == 0) { | |
1666 | if ((retval = set_mode_densblk(STp, STm)) < 0) | |
1667 | goto out; | |
1668 | if (STm->default_compression != ST_DONT_TOUCH && | |
1669 | !(STp->compression_changed)) { | |
1670 | if (st_compression(STp, (STm->default_compression == ST_YES))) { | |
1671 | st_printk(KERN_WARNING, STp, | |
1672 | "Can't set default compression.\n"); | |
1673 | if (modes_defined) { | |
1674 | retval = (-EINVAL); | |
1675 | goto out; | |
1676 | } | |
1677 | } | |
1678 | } | |
1679 | } | |
1680 | ||
1681 | STbp = STp->buffer; | |
1682 | i = write_behind_check(STp); | |
1683 | if (i) { | |
1684 | if (i == -ENOSPC) | |
1685 | STps->eof = ST_EOM_OK; | |
1686 | else | |
1687 | STps->eof = ST_EOM_ERROR; | |
1688 | } | |
1689 | ||
1690 | if (STps->eof == ST_EOM_OK) { | |
1691 | STps->eof = ST_EOD_1; /* allow next write */ | |
1692 | retval = (-ENOSPC); | |
1693 | goto out; | |
1694 | } | |
1695 | else if (STps->eof == ST_EOM_ERROR) { | |
1696 | retval = (-EIO); | |
1697 | goto out; | |
1698 | } | |
1699 | ||
1700 | /* Check the buffer readability in cases where copy_user might catch | |
1701 | the problems after some tape movement. */ | |
1702 | if (STp->block_size != 0 && | |
1703 | !STbp->do_dio && | |
1704 | (copy_from_user(&i, buf, 1) != 0 || | |
1705 | copy_from_user(&i, buf + count - 1, 1) != 0)) { | |
1706 | retval = (-EFAULT); | |
1707 | goto out; | |
1708 | } | |
1709 | ||
1710 | retval = setup_buffering(STp, buf, count, 0); | |
1711 | if (retval) | |
1712 | goto out; | |
1713 | ||
1714 | total = count; | |
1715 | ||
1716 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1717 | cmd[0] = WRITE_6; | |
1718 | cmd[1] = (STp->block_size != 0); | |
1719 | ||
1720 | STps->rw = ST_WRITING; | |
1721 | ||
1722 | b_point = buf; | |
1723 | while (count > 0 && !retry_eot) { | |
1724 | ||
1725 | if (STbp->do_dio) { | |
1726 | do_count = count; | |
1727 | } | |
1728 | else { | |
1729 | if (STp->block_size == 0) | |
1730 | do_count = count; | |
1731 | else { | |
1732 | do_count = STbp->buffer_blocks * STp->block_size - | |
1733 | STbp->buffer_bytes; | |
1734 | if (do_count > count) | |
1735 | do_count = count; | |
1736 | } | |
1737 | ||
1738 | i = append_to_buffer(b_point, STbp, do_count); | |
1739 | if (i) { | |
1740 | retval = i; | |
1741 | goto out; | |
1742 | } | |
1743 | } | |
1744 | count -= do_count; | |
1745 | b_point += do_count; | |
1746 | ||
1747 | async_write = STp->block_size == 0 && !STbp->do_dio && | |
1748 | STm->do_async_writes && STps->eof < ST_EOM_OK; | |
1749 | ||
1750 | if (STp->block_size != 0 && STm->do_buffer_writes && | |
1751 | !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK && | |
1752 | STbp->buffer_bytes < STbp->buffer_size) { | |
1753 | STp->dirty = 1; | |
1754 | /* Don't write a buffer that is not full enough. */ | |
1755 | if (!async_write && count == 0) | |
1756 | break; | |
1757 | } | |
1758 | ||
1759 | retry_write: | |
1760 | if (STp->block_size == 0) | |
1761 | blks = transfer = do_count; | |
1762 | else { | |
1763 | if (!STbp->do_dio) | |
1764 | blks = STbp->buffer_bytes; | |
1765 | else | |
1766 | blks = do_count; | |
1767 | blks /= STp->block_size; | |
1768 | transfer = blks * STp->block_size; | |
1769 | } | |
1770 | cmd[2] = blks >> 16; | |
1771 | cmd[3] = blks >> 8; | |
1772 | cmd[4] = blks; | |
1773 | ||
1774 | SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE, | |
1775 | STp->device->request_queue->rq_timeout, | |
1776 | MAX_WRITE_RETRIES, !async_write); | |
1777 | if (!SRpnt) { | |
1778 | retval = STbp->syscall_result; | |
1779 | goto out; | |
1780 | } | |
1781 | if (async_write && !STbp->syscall_result) { | |
1782 | STbp->writing = transfer; | |
1783 | STp->dirty = !(STbp->writing == | |
1784 | STbp->buffer_bytes); | |
1785 | SRpnt = NULL; /* Prevent releasing this request! */ | |
1786 | DEB( STp->write_pending = 1; ) | |
1787 | break; | |
1788 | } | |
1789 | ||
1790 | if (STbp->syscall_result != 0) { | |
1791 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1792 | ||
1793 | DEBC_printk(STp, "Error on write:\n"); | |
1794 | if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) { | |
1795 | scode = cmdstatp->sense_hdr.sense_key; | |
1796 | if (cmdstatp->remainder_valid) | |
1797 | undone = (int)cmdstatp->uremainder64; | |
1798 | else if (STp->block_size == 0 && | |
1799 | scode == VOLUME_OVERFLOW) | |
1800 | undone = transfer; | |
1801 | else | |
1802 | undone = 0; | |
1803 | if (STp->block_size != 0) | |
1804 | undone *= STp->block_size; | |
1805 | if (undone <= do_count) { | |
1806 | /* Only data from this write is not written */ | |
1807 | count += undone; | |
1808 | b_point -= undone; | |
1809 | do_count -= undone; | |
1810 | if (STp->block_size) | |
1811 | blks = (transfer - undone) / STp->block_size; | |
1812 | STps->eof = ST_EOM_OK; | |
1813 | /* Continue in fixed block mode if all written | |
1814 | in this request but still something left to write | |
1815 | (retval left to zero) | |
1816 | */ | |
1817 | if (STp->block_size == 0 || | |
1818 | undone > 0 || count == 0) | |
1819 | retval = (-ENOSPC); /* EOM within current request */ | |
1820 | DEBC_printk(STp, "EOM with %d " | |
1821 | "bytes unwritten.\n", | |
1822 | (int)count); | |
1823 | } else { | |
1824 | /* EOT within data buffered earlier (possible only | |
1825 | in fixed block mode without direct i/o) */ | |
1826 | if (!retry_eot && !cmdstatp->deferred && | |
1827 | (scode == NO_SENSE || scode == RECOVERED_ERROR)) { | |
1828 | move_buffer_data(STp->buffer, transfer - undone); | |
1829 | retry_eot = 1; | |
1830 | if (STps->drv_block >= 0) { | |
1831 | STps->drv_block += (transfer - undone) / | |
1832 | STp->block_size; | |
1833 | } | |
1834 | STps->eof = ST_EOM_OK; | |
1835 | DEBC_printk(STp, "Retry " | |
1836 | "write of %d " | |
1837 | "bytes at EOM.\n", | |
1838 | STp->buffer->buffer_bytes); | |
1839 | goto retry_write; | |
1840 | } | |
1841 | else { | |
1842 | /* Either error within data buffered by driver or | |
1843 | failed retry */ | |
1844 | count -= do_count; | |
1845 | blks = do_count = 0; | |
1846 | STps->eof = ST_EOM_ERROR; | |
1847 | STps->drv_block = (-1); /* Too cautious? */ | |
1848 | retval = (-EIO); /* EOM for old data */ | |
1849 | DEBC_printk(STp, "EOM with " | |
1850 | "lost data.\n"); | |
1851 | } | |
1852 | } | |
1853 | } else { | |
1854 | count += do_count; | |
1855 | STps->drv_block = (-1); /* Too cautious? */ | |
1856 | retval = STbp->syscall_result; | |
1857 | } | |
1858 | ||
1859 | } | |
1860 | ||
1861 | if (STps->drv_block >= 0) { | |
1862 | if (STp->block_size == 0) | |
1863 | STps->drv_block += (do_count > 0); | |
1864 | else | |
1865 | STps->drv_block += blks; | |
1866 | } | |
1867 | ||
1868 | STbp->buffer_bytes = 0; | |
1869 | STp->dirty = 0; | |
1870 | ||
1871 | if (retval || retry_eot) { | |
1872 | if (count < total) | |
1873 | retval = total - count; | |
1874 | goto out; | |
1875 | } | |
1876 | } | |
1877 | ||
1878 | if (STps->eof == ST_EOD_1) | |
1879 | STps->eof = ST_EOM_OK; | |
1880 | else if (STps->eof != ST_EOM_OK) | |
1881 | STps->eof = ST_NOEOF; | |
1882 | retval = total - count; | |
1883 | ||
1884 | out: | |
1885 | if (SRpnt != NULL) | |
1886 | st_release_request(SRpnt); | |
1887 | release_buffering(STp, 0); | |
1888 | mutex_unlock(&STp->lock); | |
1889 | ||
1890 | return retval; | |
1891 | } | |
1892 | \f | |
1893 | /* Read data from the tape. Returns zero in the normal case, one if the | |
1894 | eof status has changed, and the negative error code in case of a | |
1895 | fatal error. Otherwise updates the buffer and the eof state. | |
1896 | ||
1897 | Does release user buffer mapping if it is set. | |
1898 | */ | |
1899 | static long read_tape(struct scsi_tape *STp, long count, | |
1900 | struct st_request ** aSRpnt) | |
1901 | { | |
1902 | int transfer, blks, bytes; | |
1903 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
1904 | struct st_request *SRpnt; | |
1905 | struct st_modedef *STm; | |
1906 | struct st_partstat *STps; | |
1907 | struct st_buffer *STbp; | |
1908 | int retval = 0; | |
1909 | ||
1910 | if (count == 0) | |
1911 | return 0; | |
1912 | ||
1913 | STm = &(STp->modes[STp->current_mode]); | |
1914 | STps = &(STp->ps[STp->partition]); | |
1915 | if (STps->eof == ST_FM_HIT) | |
1916 | return 1; | |
1917 | STbp = STp->buffer; | |
1918 | ||
1919 | if (STp->block_size == 0) | |
1920 | blks = bytes = count; | |
1921 | else { | |
1922 | if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) { | |
1923 | blks = (STp->buffer)->buffer_blocks; | |
1924 | bytes = blks * STp->block_size; | |
1925 | } else { | |
1926 | bytes = count; | |
1927 | if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size) | |
1928 | bytes = (STp->buffer)->buffer_size; | |
1929 | blks = bytes / STp->block_size; | |
1930 | bytes = blks * STp->block_size; | |
1931 | } | |
1932 | } | |
1933 | ||
1934 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1935 | cmd[0] = READ_6; | |
1936 | cmd[1] = (STp->block_size != 0); | |
1937 | if (!cmd[1] && STp->sili) | |
1938 | cmd[1] |= 2; | |
1939 | cmd[2] = blks >> 16; | |
1940 | cmd[3] = blks >> 8; | |
1941 | cmd[4] = blks; | |
1942 | ||
1943 | SRpnt = *aSRpnt; | |
1944 | SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE, | |
1945 | STp->device->request_queue->rq_timeout, | |
1946 | MAX_RETRIES, 1); | |
1947 | release_buffering(STp, 1); | |
1948 | *aSRpnt = SRpnt; | |
1949 | if (!SRpnt) | |
1950 | return STbp->syscall_result; | |
1951 | ||
1952 | STbp->read_pointer = 0; | |
1953 | STps->at_sm = 0; | |
1954 | ||
1955 | /* Something to check */ | |
1956 | if (STbp->syscall_result) { | |
1957 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1958 | ||
1959 | retval = 1; | |
1960 | DEBC_printk(STp, | |
1961 | "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", | |
1962 | SRpnt->sense[0], SRpnt->sense[1], | |
1963 | SRpnt->sense[2], SRpnt->sense[3], | |
1964 | SRpnt->sense[4], SRpnt->sense[5], | |
1965 | SRpnt->sense[6], SRpnt->sense[7]); | |
1966 | if (cmdstatp->have_sense) { | |
1967 | ||
1968 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) | |
1969 | cmdstatp->flags &= 0xcf; /* No need for EOM in this case */ | |
1970 | ||
1971 | if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */ | |
1972 | /* Compute the residual count */ | |
1973 | if (cmdstatp->remainder_valid) | |
1974 | transfer = (int)cmdstatp->uremainder64; | |
1975 | else | |
1976 | transfer = 0; | |
1977 | if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) { | |
1978 | if (STp->block_size == 0) | |
1979 | transfer = bytes; | |
1980 | /* Some drives set ILI with MEDIUM ERROR */ | |
1981 | cmdstatp->flags &= ~SENSE_ILI; | |
1982 | } | |
1983 | ||
1984 | if (cmdstatp->flags & SENSE_ILI) { /* ILI */ | |
1985 | if (STp->block_size == 0 && | |
1986 | transfer < 0) { | |
1987 | st_printk(KERN_NOTICE, STp, | |
1988 | "Failed to read %d " | |
1989 | "byte block with %d " | |
1990 | "byte transfer.\n", | |
1991 | bytes - transfer, | |
1992 | bytes); | |
1993 | if (STps->drv_block >= 0) | |
1994 | STps->drv_block += 1; | |
1995 | STbp->buffer_bytes = 0; | |
1996 | return (-ENOMEM); | |
1997 | } else if (STp->block_size == 0) { | |
1998 | STbp->buffer_bytes = bytes - transfer; | |
1999 | } else { | |
2000 | st_release_request(SRpnt); | |
2001 | SRpnt = *aSRpnt = NULL; | |
2002 | if (transfer == blks) { /* We did not get anything, error */ | |
2003 | st_printk(KERN_NOTICE, STp, | |
2004 | "Incorrect " | |
2005 | "block size.\n"); | |
2006 | if (STps->drv_block >= 0) | |
2007 | STps->drv_block += blks - transfer + 1; | |
2008 | st_int_ioctl(STp, MTBSR, 1); | |
2009 | return (-EIO); | |
2010 | } | |
2011 | /* We have some data, deliver it */ | |
2012 | STbp->buffer_bytes = (blks - transfer) * | |
2013 | STp->block_size; | |
2014 | DEBC_printk(STp, "ILI but " | |
2015 | "enough data " | |
2016 | "received %ld " | |
2017 | "%d.\n", count, | |
2018 | STbp->buffer_bytes); | |
2019 | if (STps->drv_block >= 0) | |
2020 | STps->drv_block += 1; | |
2021 | if (st_int_ioctl(STp, MTBSR, 1)) | |
2022 | return (-EIO); | |
2023 | } | |
2024 | } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */ | |
2025 | if (STps->eof != ST_FM_HIT) | |
2026 | STps->eof = ST_FM_HIT; | |
2027 | else | |
2028 | STps->eof = ST_EOD_2; | |
2029 | if (STp->block_size == 0) | |
2030 | STbp->buffer_bytes = 0; | |
2031 | else | |
2032 | STbp->buffer_bytes = | |
2033 | bytes - transfer * STp->block_size; | |
2034 | DEBC_printk(STp, "EOF detected (%d " | |
2035 | "bytes read).\n", | |
2036 | STbp->buffer_bytes); | |
2037 | } else if (cmdstatp->flags & SENSE_EOM) { | |
2038 | if (STps->eof == ST_FM) | |
2039 | STps->eof = ST_EOD_1; | |
2040 | else | |
2041 | STps->eof = ST_EOM_OK; | |
2042 | if (STp->block_size == 0) | |
2043 | STbp->buffer_bytes = bytes - transfer; | |
2044 | else | |
2045 | STbp->buffer_bytes = | |
2046 | bytes - transfer * STp->block_size; | |
2047 | ||
2048 | DEBC_printk(STp, "EOM detected (%d " | |
2049 | "bytes read).\n", | |
2050 | STbp->buffer_bytes); | |
2051 | } | |
2052 | } | |
2053 | /* end of EOF, EOM, ILI test */ | |
2054 | else { /* nonzero sense key */ | |
2055 | DEBC_printk(STp, "Tape error while reading.\n"); | |
2056 | STps->drv_block = (-1); | |
2057 | if (STps->eof == ST_FM && | |
2058 | cmdstatp->sense_hdr.sense_key == BLANK_CHECK) { | |
2059 | DEBC_printk(STp, "Zero returned for " | |
2060 | "first BLANK CHECK " | |
2061 | "after EOF.\n"); | |
2062 | STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */ | |
2063 | } else /* Some other extended sense code */ | |
2064 | retval = (-EIO); | |
2065 | } | |
2066 | ||
2067 | if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */ | |
2068 | STbp->buffer_bytes = 0; | |
2069 | } | |
2070 | /* End of extended sense test */ | |
2071 | else { /* Non-extended sense */ | |
2072 | retval = STbp->syscall_result; | |
2073 | } | |
2074 | ||
2075 | } | |
2076 | /* End of error handling */ | |
2077 | else { /* Read successful */ | |
2078 | STbp->buffer_bytes = bytes; | |
2079 | if (STp->sili) /* In fixed block mode residual is always zero here */ | |
2080 | STbp->buffer_bytes -= STp->buffer->cmdstat.residual; | |
2081 | } | |
2082 | ||
2083 | if (STps->drv_block >= 0) { | |
2084 | if (STp->block_size == 0) | |
2085 | STps->drv_block++; | |
2086 | else | |
2087 | STps->drv_block += STbp->buffer_bytes / STp->block_size; | |
2088 | } | |
2089 | return retval; | |
2090 | } | |
2091 | \f | |
2092 | ||
2093 | /* Read command */ | |
2094 | static ssize_t | |
2095 | st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
2096 | { | |
2097 | ssize_t total; | |
2098 | ssize_t retval = 0; | |
2099 | ssize_t i, transfer; | |
2100 | int special, do_dio = 0; | |
2101 | struct st_request *SRpnt = NULL; | |
2102 | struct scsi_tape *STp = filp->private_data; | |
2103 | struct st_modedef *STm; | |
2104 | struct st_partstat *STps; | |
2105 | struct st_buffer *STbp = STp->buffer; | |
2106 | ||
2107 | if (mutex_lock_interruptible(&STp->lock)) | |
2108 | return -ERESTARTSYS; | |
2109 | ||
2110 | retval = rw_checks(STp, filp, count); | |
2111 | if (retval || count == 0) | |
2112 | goto out; | |
2113 | ||
2114 | STm = &(STp->modes[STp->current_mode]); | |
2115 | if (STp->block_size != 0 && (count % STp->block_size) != 0) { | |
2116 | if (!STm->do_read_ahead) { | |
2117 | retval = (-EINVAL); /* Read must be integral number of blocks */ | |
2118 | goto out; | |
2119 | } | |
2120 | STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */ | |
2121 | } | |
2122 | ||
2123 | STps = &(STp->ps[STp->partition]); | |
2124 | if (STps->rw == ST_WRITING) { | |
2125 | retval = flush_buffer(STp, 0); | |
2126 | if (retval) | |
2127 | goto out; | |
2128 | STps->rw = ST_READING; | |
2129 | } | |
2130 | DEB( | |
2131 | if (debugging && STps->eof != ST_NOEOF) | |
2132 | st_printk(ST_DEB_MSG, STp, | |
2133 | "EOF/EOM flag up (%d). Bytes %d\n", | |
2134 | STps->eof, STbp->buffer_bytes); | |
2135 | ) /* end DEB */ | |
2136 | ||
2137 | retval = setup_buffering(STp, buf, count, 1); | |
2138 | if (retval) | |
2139 | goto out; | |
2140 | do_dio = STbp->do_dio; | |
2141 | ||
2142 | if (STbp->buffer_bytes == 0 && | |
2143 | STps->eof >= ST_EOD_1) { | |
2144 | if (STps->eof < ST_EOD) { | |
2145 | STps->eof += 1; | |
2146 | retval = 0; | |
2147 | goto out; | |
2148 | } | |
2149 | retval = (-EIO); /* EOM or Blank Check */ | |
2150 | goto out; | |
2151 | } | |
2152 | ||
2153 | if (do_dio) { | |
2154 | /* Check the buffer writability before any tape movement. Don't alter | |
2155 | buffer data. */ | |
2156 | if (copy_from_user(&i, buf, 1) != 0 || | |
2157 | copy_to_user(buf, &i, 1) != 0 || | |
2158 | copy_from_user(&i, buf + count - 1, 1) != 0 || | |
2159 | copy_to_user(buf + count - 1, &i, 1) != 0) { | |
2160 | retval = (-EFAULT); | |
2161 | goto out; | |
2162 | } | |
2163 | } | |
2164 | ||
2165 | STps->rw = ST_READING; | |
2166 | ||
2167 | ||
2168 | /* Loop until enough data in buffer or a special condition found */ | |
2169 | for (total = 0, special = 0; total < count && !special;) { | |
2170 | ||
2171 | /* Get new data if the buffer is empty */ | |
2172 | if (STbp->buffer_bytes == 0) { | |
2173 | special = read_tape(STp, count - total, &SRpnt); | |
2174 | if (special < 0) { /* No need to continue read */ | |
2175 | retval = special; | |
2176 | goto out; | |
2177 | } | |
2178 | } | |
2179 | ||
2180 | /* Move the data from driver buffer to user buffer */ | |
2181 | if (STbp->buffer_bytes > 0) { | |
2182 | DEB( | |
2183 | if (debugging && STps->eof != ST_NOEOF) | |
2184 | st_printk(ST_DEB_MSG, STp, | |
2185 | "EOF up (%d). Left %d, needed %d.\n", | |
2186 | STps->eof, STbp->buffer_bytes, | |
2187 | (int)(count - total)); | |
2188 | ) /* end DEB */ | |
2189 | transfer = STbp->buffer_bytes < count - total ? | |
2190 | STbp->buffer_bytes : count - total; | |
2191 | if (!do_dio) { | |
2192 | i = from_buffer(STbp, buf, transfer); | |
2193 | if (i) { | |
2194 | retval = i; | |
2195 | goto out; | |
2196 | } | |
2197 | } | |
2198 | buf += transfer; | |
2199 | total += transfer; | |
2200 | } | |
2201 | ||
2202 | if (STp->block_size == 0) | |
2203 | break; /* Read only one variable length block */ | |
2204 | ||
2205 | } /* for (total = 0, special = 0; | |
2206 | total < count && !special; ) */ | |
2207 | ||
2208 | /* Change the eof state if no data from tape or buffer */ | |
2209 | if (total == 0) { | |
2210 | if (STps->eof == ST_FM_HIT) { | |
2211 | STps->eof = ST_FM; | |
2212 | STps->drv_block = 0; | |
2213 | if (STps->drv_file >= 0) | |
2214 | STps->drv_file++; | |
2215 | } else if (STps->eof == ST_EOD_1) { | |
2216 | STps->eof = ST_EOD_2; | |
2217 | STps->drv_block = 0; | |
2218 | if (STps->drv_file >= 0) | |
2219 | STps->drv_file++; | |
2220 | } else if (STps->eof == ST_EOD_2) | |
2221 | STps->eof = ST_EOD; | |
2222 | } else if (STps->eof == ST_FM) | |
2223 | STps->eof = ST_NOEOF; | |
2224 | retval = total; | |
2225 | ||
2226 | out: | |
2227 | if (SRpnt != NULL) { | |
2228 | st_release_request(SRpnt); | |
2229 | SRpnt = NULL; | |
2230 | } | |
2231 | if (do_dio) { | |
2232 | release_buffering(STp, 1); | |
2233 | STbp->buffer_bytes = 0; | |
2234 | } | |
2235 | mutex_unlock(&STp->lock); | |
2236 | ||
2237 | return retval; | |
2238 | } | |
2239 | \f | |
2240 | ||
2241 | ||
2242 | DEB( | |
2243 | /* Set the driver options */ | |
2244 | static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm) | |
2245 | { | |
2246 | if (debugging) { | |
2247 | st_printk(KERN_INFO, STp, | |
2248 | "Mode %d options: buffer writes: %d, " | |
2249 | "async writes: %d, read ahead: %d\n", | |
2250 | STp->current_mode, STm->do_buffer_writes, | |
2251 | STm->do_async_writes, STm->do_read_ahead); | |
2252 | st_printk(KERN_INFO, STp, | |
2253 | " can bsr: %d, two FMs: %d, " | |
2254 | "fast mteom: %d, auto lock: %d,\n", | |
2255 | STp->can_bsr, STp->two_fm, STp->fast_mteom, | |
2256 | STp->do_auto_lock); | |
2257 | st_printk(KERN_INFO, STp, | |
2258 | " defs for wr: %d, no block limits: %d, " | |
2259 | "partitions: %d, s2 log: %d\n", | |
2260 | STm->defaults_for_writes, STp->omit_blklims, | |
2261 | STp->can_partitions, STp->scsi2_logical); | |
2262 | st_printk(KERN_INFO, STp, | |
2263 | " sysv: %d nowait: %d sili: %d " | |
2264 | "nowait_filemark: %d\n", | |
2265 | STm->sysv, STp->immediate, STp->sili, | |
2266 | STp->immediate_filemark); | |
2267 | st_printk(KERN_INFO, STp, " debugging: %d\n", debugging); | |
2268 | } | |
2269 | } | |
2270 | ) | |
2271 | ||
2272 | ||
2273 | static int st_set_options(struct scsi_tape *STp, long options) | |
2274 | { | |
2275 | int value; | |
2276 | long code; | |
2277 | struct st_modedef *STm; | |
2278 | struct cdev *cd0, *cd1; | |
2279 | struct device *d0, *d1; | |
2280 | ||
2281 | STm = &(STp->modes[STp->current_mode]); | |
2282 | if (!STm->defined) { | |
2283 | cd0 = STm->cdevs[0]; | |
2284 | cd1 = STm->cdevs[1]; | |
2285 | d0 = STm->devs[0]; | |
2286 | d1 = STm->devs[1]; | |
2287 | memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); | |
2288 | STm->cdevs[0] = cd0; | |
2289 | STm->cdevs[1] = cd1; | |
2290 | STm->devs[0] = d0; | |
2291 | STm->devs[1] = d1; | |
2292 | modes_defined = 1; | |
2293 | DEBC_printk(STp, "Initialized mode %d definition from mode 0\n", | |
2294 | STp->current_mode); | |
2295 | } | |
2296 | ||
2297 | code = options & MT_ST_OPTIONS; | |
2298 | if (code == MT_ST_BOOLEANS) { | |
2299 | STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; | |
2300 | STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; | |
2301 | STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; | |
2302 | STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; | |
2303 | STp->two_fm = (options & MT_ST_TWO_FM) != 0; | |
2304 | STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; | |
2305 | STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; | |
2306 | STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; | |
2307 | STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; | |
2308 | if ((STp->device)->scsi_level >= SCSI_2) | |
2309 | STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; | |
2310 | STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; | |
2311 | STp->immediate = (options & MT_ST_NOWAIT) != 0; | |
2312 | STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0; | |
2313 | STm->sysv = (options & MT_ST_SYSV) != 0; | |
2314 | STp->sili = (options & MT_ST_SILI) != 0; | |
2315 | DEB( debugging = (options & MT_ST_DEBUGGING) != 0; | |
2316 | st_log_options(STp, STm); ) | |
2317 | } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { | |
2318 | value = (code == MT_ST_SETBOOLEANS); | |
2319 | if ((options & MT_ST_BUFFER_WRITES) != 0) | |
2320 | STm->do_buffer_writes = value; | |
2321 | if ((options & MT_ST_ASYNC_WRITES) != 0) | |
2322 | STm->do_async_writes = value; | |
2323 | if ((options & MT_ST_DEF_WRITES) != 0) | |
2324 | STm->defaults_for_writes = value; | |
2325 | if ((options & MT_ST_READ_AHEAD) != 0) | |
2326 | STm->do_read_ahead = value; | |
2327 | if ((options & MT_ST_TWO_FM) != 0) | |
2328 | STp->two_fm = value; | |
2329 | if ((options & MT_ST_FAST_MTEOM) != 0) | |
2330 | STp->fast_mteom = value; | |
2331 | if ((options & MT_ST_AUTO_LOCK) != 0) | |
2332 | STp->do_auto_lock = value; | |
2333 | if ((options & MT_ST_CAN_BSR) != 0) | |
2334 | STp->can_bsr = value; | |
2335 | if ((options & MT_ST_NO_BLKLIMS) != 0) | |
2336 | STp->omit_blklims = value; | |
2337 | if ((STp->device)->scsi_level >= SCSI_2 && | |
2338 | (options & MT_ST_CAN_PARTITIONS) != 0) | |
2339 | STp->can_partitions = value; | |
2340 | if ((options & MT_ST_SCSI2LOGICAL) != 0) | |
2341 | STp->scsi2_logical = value; | |
2342 | if ((options & MT_ST_NOWAIT) != 0) | |
2343 | STp->immediate = value; | |
2344 | if ((options & MT_ST_NOWAIT_EOF) != 0) | |
2345 | STp->immediate_filemark = value; | |
2346 | if ((options & MT_ST_SYSV) != 0) | |
2347 | STm->sysv = value; | |
2348 | if ((options & MT_ST_SILI) != 0) | |
2349 | STp->sili = value; | |
2350 | DEB( | |
2351 | if ((options & MT_ST_DEBUGGING) != 0) | |
2352 | debugging = value; | |
2353 | st_log_options(STp, STm); ) | |
2354 | } else if (code == MT_ST_WRITE_THRESHOLD) { | |
2355 | /* Retained for compatibility */ | |
2356 | } else if (code == MT_ST_DEF_BLKSIZE) { | |
2357 | value = (options & ~MT_ST_OPTIONS); | |
2358 | if (value == ~MT_ST_OPTIONS) { | |
2359 | STm->default_blksize = (-1); | |
2360 | DEBC_printk(STp, "Default block size disabled.\n"); | |
2361 | } else { | |
2362 | STm->default_blksize = value; | |
2363 | DEBC_printk(STp,"Default block size set to " | |
2364 | "%d bytes.\n", STm->default_blksize); | |
2365 | if (STp->ready == ST_READY) { | |
2366 | STp->blksize_changed = 0; | |
2367 | set_mode_densblk(STp, STm); | |
2368 | } | |
2369 | } | |
2370 | } else if (code == MT_ST_TIMEOUTS) { | |
2371 | value = (options & ~MT_ST_OPTIONS); | |
2372 | if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { | |
2373 | STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; | |
2374 | DEBC_printk(STp, "Long timeout set to %d seconds.\n", | |
2375 | (value & ~MT_ST_SET_LONG_TIMEOUT)); | |
2376 | } else { | |
2377 | blk_queue_rq_timeout(STp->device->request_queue, | |
2378 | value * HZ); | |
2379 | DEBC_printk(STp, "Normal timeout set to %d seconds.\n", | |
2380 | value); | |
2381 | } | |
2382 | } else if (code == MT_ST_SET_CLN) { | |
2383 | value = (options & ~MT_ST_OPTIONS) & 0xff; | |
2384 | if (value != 0 && | |
2385 | (value < EXTENDED_SENSE_START || | |
2386 | value >= SCSI_SENSE_BUFFERSIZE)) | |
2387 | return (-EINVAL); | |
2388 | STp->cln_mode = value; | |
2389 | STp->cln_sense_mask = (options >> 8) & 0xff; | |
2390 | STp->cln_sense_value = (options >> 16) & 0xff; | |
2391 | st_printk(KERN_INFO, STp, | |
2392 | "Cleaning request mode %d, mask %02x, value %02x\n", | |
2393 | value, STp->cln_sense_mask, STp->cln_sense_value); | |
2394 | } else if (code == MT_ST_DEF_OPTIONS) { | |
2395 | code = (options & ~MT_ST_CLEAR_DEFAULT); | |
2396 | value = (options & MT_ST_CLEAR_DEFAULT); | |
2397 | if (code == MT_ST_DEF_DENSITY) { | |
2398 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2399 | STm->default_density = (-1); | |
2400 | DEBC_printk(STp, | |
2401 | "Density default disabled.\n"); | |
2402 | } else { | |
2403 | STm->default_density = value & 0xff; | |
2404 | DEBC_printk(STp, "Density default set to %x\n", | |
2405 | STm->default_density); | |
2406 | if (STp->ready == ST_READY) { | |
2407 | STp->density_changed = 0; | |
2408 | set_mode_densblk(STp, STm); | |
2409 | } | |
2410 | } | |
2411 | } else if (code == MT_ST_DEF_DRVBUFFER) { | |
2412 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2413 | STp->default_drvbuffer = 0xff; | |
2414 | DEBC_printk(STp, | |
2415 | "Drive buffer default disabled.\n"); | |
2416 | } else { | |
2417 | STp->default_drvbuffer = value & 7; | |
2418 | DEBC_printk(STp, | |
2419 | "Drive buffer default set to %x\n", | |
2420 | STp->default_drvbuffer); | |
2421 | if (STp->ready == ST_READY) | |
2422 | st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer); | |
2423 | } | |
2424 | } else if (code == MT_ST_DEF_COMPRESSION) { | |
2425 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2426 | STm->default_compression = ST_DONT_TOUCH; | |
2427 | DEBC_printk(STp, | |
2428 | "Compression default disabled.\n"); | |
2429 | } else { | |
2430 | if ((value & 0xff00) != 0) { | |
2431 | STp->c_algo = (value & 0xff00) >> 8; | |
2432 | DEBC_printk(STp, "Compression " | |
2433 | "algorithm set to 0x%x.\n", | |
2434 | STp->c_algo); | |
2435 | } | |
2436 | if ((value & 0xff) != 0xff) { | |
2437 | STm->default_compression = (value & 1 ? ST_YES : ST_NO); | |
2438 | DEBC_printk(STp, "Compression default " | |
2439 | "set to %x\n", | |
2440 | (value & 1)); | |
2441 | if (STp->ready == ST_READY) { | |
2442 | STp->compression_changed = 0; | |
2443 | st_compression(STp, (STm->default_compression == ST_YES)); | |
2444 | } | |
2445 | } | |
2446 | } | |
2447 | } | |
2448 | } else | |
2449 | return (-EIO); | |
2450 | ||
2451 | return 0; | |
2452 | } | |
2453 | \f | |
2454 | #define MODE_HEADER_LENGTH 4 | |
2455 | ||
2456 | /* Mode header and page byte offsets */ | |
2457 | #define MH_OFF_DATA_LENGTH 0 | |
2458 | #define MH_OFF_MEDIUM_TYPE 1 | |
2459 | #define MH_OFF_DEV_SPECIFIC 2 | |
2460 | #define MH_OFF_BDESCS_LENGTH 3 | |
2461 | #define MP_OFF_PAGE_NBR 0 | |
2462 | #define MP_OFF_PAGE_LENGTH 1 | |
2463 | ||
2464 | /* Mode header and page bit masks */ | |
2465 | #define MH_BIT_WP 0x80 | |
2466 | #define MP_MSK_PAGE_NBR 0x3f | |
2467 | ||
2468 | /* Don't return block descriptors */ | |
2469 | #define MODE_SENSE_OMIT_BDESCS 0x08 | |
2470 | ||
2471 | #define MODE_SELECT_PAGE_FORMAT 0x10 | |
2472 | ||
2473 | /* Read a mode page into the tape buffer. The block descriptors are included | |
2474 | if incl_block_descs is true. The page control is ored to the page number | |
2475 | parameter, if necessary. */ | |
2476 | static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) | |
2477 | { | |
2478 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
2479 | struct st_request *SRpnt; | |
2480 | ||
2481 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2482 | cmd[0] = MODE_SENSE; | |
2483 | if (omit_block_descs) | |
2484 | cmd[1] = MODE_SENSE_OMIT_BDESCS; | |
2485 | cmd[2] = page; | |
2486 | cmd[4] = 255; | |
2487 | ||
2488 | SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE, | |
2489 | STp->device->request_queue->rq_timeout, 0, 1); | |
2490 | if (SRpnt == NULL) | |
2491 | return (STp->buffer)->syscall_result; | |
2492 | ||
2493 | st_release_request(SRpnt); | |
2494 | ||
2495 | return STp->buffer->syscall_result; | |
2496 | } | |
2497 | ||
2498 | ||
2499 | /* Send the mode page in the tape buffer to the drive. Assumes that the mode data | |
2500 | in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ | |
2501 | static int write_mode_page(struct scsi_tape *STp, int page, int slow) | |
2502 | { | |
2503 | int pgo; | |
2504 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
2505 | struct st_request *SRpnt; | |
2506 | int timeout; | |
2507 | ||
2508 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2509 | cmd[0] = MODE_SELECT; | |
2510 | cmd[1] = MODE_SELECT_PAGE_FORMAT; | |
2511 | pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH]; | |
2512 | cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2; | |
2513 | ||
2514 | /* Clear reserved fields */ | |
2515 | (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0; | |
2516 | (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0; | |
2517 | (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; | |
2518 | (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; | |
2519 | ||
2520 | timeout = slow ? | |
2521 | STp->long_timeout : STp->device->request_queue->rq_timeout; | |
2522 | SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE, | |
2523 | timeout, 0, 1); | |
2524 | if (SRpnt == NULL) | |
2525 | return (STp->buffer)->syscall_result; | |
2526 | ||
2527 | st_release_request(SRpnt); | |
2528 | ||
2529 | return STp->buffer->syscall_result; | |
2530 | } | |
2531 | ||
2532 | ||
2533 | #define COMPRESSION_PAGE 0x0f | |
2534 | #define COMPRESSION_PAGE_LENGTH 16 | |
2535 | ||
2536 | #define CP_OFF_DCE_DCC 2 | |
2537 | #define CP_OFF_C_ALGO 7 | |
2538 | ||
2539 | #define DCE_MASK 0x80 | |
2540 | #define DCC_MASK 0x40 | |
2541 | #define RED_MASK 0x60 | |
2542 | ||
2543 | ||
2544 | /* Control the compression with mode page 15. Algorithm not changed if zero. | |
2545 | ||
2546 | The block descriptors are read and written because Sony SDT-7000 does not | |
2547 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). | |
2548 | Including block descriptors should not cause any harm to other drives. */ | |
2549 | ||
2550 | static int st_compression(struct scsi_tape * STp, int state) | |
2551 | { | |
2552 | int retval; | |
2553 | int mpoffs; /* Offset to mode page start */ | |
2554 | unsigned char *b_data = (STp->buffer)->b_data; | |
2555 | ||
2556 | if (STp->ready != ST_READY) | |
2557 | return (-EIO); | |
2558 | ||
2559 | /* Read the current page contents */ | |
2560 | retval = read_mode_page(STp, COMPRESSION_PAGE, 0); | |
2561 | if (retval) { | |
2562 | DEBC_printk(STp, "Compression mode page not supported.\n"); | |
2563 | return (-EIO); | |
2564 | } | |
2565 | ||
2566 | mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; | |
2567 | DEBC_printk(STp, "Compression state is %d.\n", | |
2568 | (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0)); | |
2569 | ||
2570 | /* Check if compression can be changed */ | |
2571 | if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) { | |
2572 | DEBC_printk(STp, "Compression not supported.\n"); | |
2573 | return (-EIO); | |
2574 | } | |
2575 | ||
2576 | /* Do the change */ | |
2577 | if (state) { | |
2578 | b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK; | |
2579 | if (STp->c_algo != 0) | |
2580 | b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo; | |
2581 | } | |
2582 | else { | |
2583 | b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK; | |
2584 | if (STp->c_algo != 0) | |
2585 | b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */ | |
2586 | } | |
2587 | ||
2588 | retval = write_mode_page(STp, COMPRESSION_PAGE, 0); | |
2589 | if (retval) { | |
2590 | DEBC_printk(STp, "Compression change failed.\n"); | |
2591 | return (-EIO); | |
2592 | } | |
2593 | DEBC_printk(STp, "Compression state changed to %d.\n", state); | |
2594 | ||
2595 | STp->compression_changed = 1; | |
2596 | return 0; | |
2597 | } | |
2598 | ||
2599 | ||
2600 | /* Process the load and unload commands (does unload if the load code is zero) */ | |
2601 | static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code) | |
2602 | { | |
2603 | int retval = (-EIO), timeout; | |
2604 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
2605 | struct st_partstat *STps; | |
2606 | struct st_request *SRpnt; | |
2607 | ||
2608 | if (STp->ready != ST_READY && !load_code) { | |
2609 | if (STp->ready == ST_NO_TAPE) | |
2610 | return (-ENOMEDIUM); | |
2611 | else | |
2612 | return (-EIO); | |
2613 | } | |
2614 | ||
2615 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2616 | cmd[0] = START_STOP; | |
2617 | if (load_code) | |
2618 | cmd[4] |= 1; | |
2619 | /* | |
2620 | * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A | |
2621 | */ | |
2622 | if (load_code >= 1 + MT_ST_HPLOADER_OFFSET | |
2623 | && load_code <= 6 + MT_ST_HPLOADER_OFFSET) { | |
2624 | DEBC_printk(STp, " Enhanced %sload slot %2d.\n", | |
2625 | (cmd[4]) ? "" : "un", | |
2626 | load_code - MT_ST_HPLOADER_OFFSET); | |
2627 | cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ | |
2628 | } | |
2629 | if (STp->immediate) { | |
2630 | cmd[1] = 1; /* Don't wait for completion */ | |
2631 | timeout = STp->device->request_queue->rq_timeout; | |
2632 | } | |
2633 | else | |
2634 | timeout = STp->long_timeout; | |
2635 | ||
2636 | DEBC( | |
2637 | if (!load_code) | |
2638 | st_printk(ST_DEB_MSG, STp, "Unloading tape.\n"); | |
2639 | else | |
2640 | st_printk(ST_DEB_MSG, STp, "Loading tape.\n"); | |
2641 | ); | |
2642 | ||
2643 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, | |
2644 | timeout, MAX_RETRIES, 1); | |
2645 | if (!SRpnt) | |
2646 | return (STp->buffer)->syscall_result; | |
2647 | ||
2648 | retval = (STp->buffer)->syscall_result; | |
2649 | st_release_request(SRpnt); | |
2650 | ||
2651 | if (!retval) { /* SCSI command successful */ | |
2652 | ||
2653 | if (!load_code) { | |
2654 | STp->rew_at_close = 0; | |
2655 | STp->ready = ST_NO_TAPE; | |
2656 | } | |
2657 | else { | |
2658 | STp->rew_at_close = STp->autorew_dev; | |
2659 | retval = check_tape(STp, filp); | |
2660 | if (retval > 0) | |
2661 | retval = 0; | |
2662 | } | |
2663 | } | |
2664 | else { | |
2665 | STps = &(STp->ps[STp->partition]); | |
2666 | STps->drv_file = STps->drv_block = (-1); | |
2667 | } | |
2668 | ||
2669 | return retval; | |
2670 | } | |
2671 | \f | |
2672 | #if DEBUG | |
2673 | #define ST_DEB_FORWARD 0 | |
2674 | #define ST_DEB_BACKWARD 1 | |
2675 | static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) | |
2676 | { | |
2677 | s32 sc; | |
2678 | ||
2679 | if (!debugging) | |
2680 | return; | |
2681 | ||
2682 | sc = cmd[2] & 0x80 ? 0xff000000 : 0; | |
2683 | sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; | |
2684 | if (direction) | |
2685 | sc = -sc; | |
2686 | st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n", | |
2687 | direction ? "backward" : "forward", sc, units); | |
2688 | } | |
2689 | #else | |
2690 | #define ST_DEB_FORWARD 0 | |
2691 | #define ST_DEB_BACKWARD 1 | |
2692 | static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {} | |
2693 | #endif | |
2694 | ||
2695 | ||
2696 | /* Internal ioctl function */ | |
2697 | static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) | |
2698 | { | |
2699 | int timeout; | |
2700 | long ltmp; | |
2701 | int ioctl_result; | |
2702 | int chg_eof = 1; | |
2703 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
2704 | struct st_request *SRpnt; | |
2705 | struct st_partstat *STps; | |
2706 | int fileno, blkno, at_sm, undone; | |
2707 | int datalen = 0, direction = DMA_NONE; | |
2708 | ||
2709 | WARN_ON(STp->buffer->do_dio != 0); | |
2710 | if (STp->ready != ST_READY) { | |
2711 | if (STp->ready == ST_NO_TAPE) | |
2712 | return (-ENOMEDIUM); | |
2713 | else | |
2714 | return (-EIO); | |
2715 | } | |
2716 | timeout = STp->long_timeout; | |
2717 | STps = &(STp->ps[STp->partition]); | |
2718 | fileno = STps->drv_file; | |
2719 | blkno = STps->drv_block; | |
2720 | at_sm = STps->at_sm; | |
2721 | ||
2722 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2723 | switch (cmd_in) { | |
2724 | case MTFSFM: | |
2725 | chg_eof = 0; /* Changed from the FSF after this */ | |
2726 | case MTFSF: | |
2727 | cmd[0] = SPACE; | |
2728 | cmd[1] = 0x01; /* Space FileMarks */ | |
2729 | cmd[2] = (arg >> 16); | |
2730 | cmd[3] = (arg >> 8); | |
2731 | cmd[4] = arg; | |
2732 | deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd); | |
2733 | if (fileno >= 0) | |
2734 | fileno += arg; | |
2735 | blkno = 0; | |
2736 | at_sm &= (arg == 0); | |
2737 | break; | |
2738 | case MTBSFM: | |
2739 | chg_eof = 0; /* Changed from the FSF after this */ | |
2740 | case MTBSF: | |
2741 | cmd[0] = SPACE; | |
2742 | cmd[1] = 0x01; /* Space FileMarks */ | |
2743 | ltmp = (-arg); | |
2744 | cmd[2] = (ltmp >> 16); | |
2745 | cmd[3] = (ltmp >> 8); | |
2746 | cmd[4] = ltmp; | |
2747 | deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd); | |
2748 | if (fileno >= 0) | |
2749 | fileno -= arg; | |
2750 | blkno = (-1); /* We can't know the block number */ | |
2751 | at_sm &= (arg == 0); | |
2752 | break; | |
2753 | case MTFSR: | |
2754 | cmd[0] = SPACE; | |
2755 | cmd[1] = 0x00; /* Space Blocks */ | |
2756 | cmd[2] = (arg >> 16); | |
2757 | cmd[3] = (arg >> 8); | |
2758 | cmd[4] = arg; | |
2759 | deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd); | |
2760 | if (blkno >= 0) | |
2761 | blkno += arg; | |
2762 | at_sm &= (arg == 0); | |
2763 | break; | |
2764 | case MTBSR: | |
2765 | cmd[0] = SPACE; | |
2766 | cmd[1] = 0x00; /* Space Blocks */ | |
2767 | ltmp = (-arg); | |
2768 | cmd[2] = (ltmp >> 16); | |
2769 | cmd[3] = (ltmp >> 8); | |
2770 | cmd[4] = ltmp; | |
2771 | deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd); | |
2772 | if (blkno >= 0) | |
2773 | blkno -= arg; | |
2774 | at_sm &= (arg == 0); | |
2775 | break; | |
2776 | case MTFSS: | |
2777 | cmd[0] = SPACE; | |
2778 | cmd[1] = 0x04; /* Space Setmarks */ | |
2779 | cmd[2] = (arg >> 16); | |
2780 | cmd[3] = (arg >> 8); | |
2781 | cmd[4] = arg; | |
2782 | deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd); | |
2783 | if (arg != 0) { | |
2784 | blkno = fileno = (-1); | |
2785 | at_sm = 1; | |
2786 | } | |
2787 | break; | |
2788 | case MTBSS: | |
2789 | cmd[0] = SPACE; | |
2790 | cmd[1] = 0x04; /* Space Setmarks */ | |
2791 | ltmp = (-arg); | |
2792 | cmd[2] = (ltmp >> 16); | |
2793 | cmd[3] = (ltmp >> 8); | |
2794 | cmd[4] = ltmp; | |
2795 | deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd); | |
2796 | if (arg != 0) { | |
2797 | blkno = fileno = (-1); | |
2798 | at_sm = 1; | |
2799 | } | |
2800 | break; | |
2801 | case MTWEOF: | |
2802 | case MTWEOFI: | |
2803 | case MTWSM: | |
2804 | if (STp->write_prot) | |
2805 | return (-EACCES); | |
2806 | cmd[0] = WRITE_FILEMARKS; | |
2807 | if (cmd_in == MTWSM) | |
2808 | cmd[1] = 2; | |
2809 | if (cmd_in == MTWEOFI || | |
2810 | (cmd_in == MTWEOF && STp->immediate_filemark)) | |
2811 | cmd[1] |= 1; | |
2812 | cmd[2] = (arg >> 16); | |
2813 | cmd[3] = (arg >> 8); | |
2814 | cmd[4] = arg; | |
2815 | timeout = STp->device->request_queue->rq_timeout; | |
2816 | DEBC( | |
2817 | if (cmd_in != MTWSM) | |
2818 | st_printk(ST_DEB_MSG, STp, | |
2819 | "Writing %d filemarks.\n", | |
2820 | cmd[2] * 65536 + | |
2821 | cmd[3] * 256 + | |
2822 | cmd[4]); | |
2823 | else | |
2824 | st_printk(ST_DEB_MSG, STp, | |
2825 | "Writing %d setmarks.\n", | |
2826 | cmd[2] * 65536 + | |
2827 | cmd[3] * 256 + | |
2828 | cmd[4]); | |
2829 | ) | |
2830 | if (fileno >= 0) | |
2831 | fileno += arg; | |
2832 | blkno = 0; | |
2833 | at_sm = (cmd_in == MTWSM); | |
2834 | break; | |
2835 | case MTREW: | |
2836 | cmd[0] = REZERO_UNIT; | |
2837 | if (STp->immediate) { | |
2838 | cmd[1] = 1; /* Don't wait for completion */ | |
2839 | timeout = STp->device->request_queue->rq_timeout; | |
2840 | } | |
2841 | DEBC_printk(STp, "Rewinding tape.\n"); | |
2842 | fileno = blkno = at_sm = 0; | |
2843 | break; | |
2844 | case MTNOP: | |
2845 | DEBC_printk(STp, "No op on tape.\n"); | |
2846 | return 0; /* Should do something ? */ | |
2847 | break; | |
2848 | case MTRETEN: | |
2849 | cmd[0] = START_STOP; | |
2850 | if (STp->immediate) { | |
2851 | cmd[1] = 1; /* Don't wait for completion */ | |
2852 | timeout = STp->device->request_queue->rq_timeout; | |
2853 | } | |
2854 | cmd[4] = 3; | |
2855 | DEBC_printk(STp, "Retensioning tape.\n"); | |
2856 | fileno = blkno = at_sm = 0; | |
2857 | break; | |
2858 | case MTEOM: | |
2859 | if (!STp->fast_mteom) { | |
2860 | /* space to the end of tape */ | |
2861 | ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); | |
2862 | fileno = STps->drv_file; | |
2863 | if (STps->eof >= ST_EOD_1) | |
2864 | return 0; | |
2865 | /* The next lines would hide the number of spaced FileMarks | |
2866 | That's why I inserted the previous lines. I had no luck | |
2867 | with detecting EOM with FSF, so we go now to EOM. | |
2868 | Joerg Weule */ | |
2869 | } else | |
2870 | fileno = (-1); | |
2871 | cmd[0] = SPACE; | |
2872 | cmd[1] = 3; | |
2873 | DEBC_printk(STp, "Spacing to end of recorded medium.\n"); | |
2874 | blkno = -1; | |
2875 | at_sm = 0; | |
2876 | break; | |
2877 | case MTERASE: | |
2878 | if (STp->write_prot) | |
2879 | return (-EACCES); | |
2880 | cmd[0] = ERASE; | |
2881 | cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ | |
2882 | if (STp->immediate) { | |
2883 | cmd[1] |= 2; /* Don't wait for completion */ | |
2884 | timeout = STp->device->request_queue->rq_timeout; | |
2885 | } | |
2886 | else | |
2887 | timeout = STp->long_timeout * 8; | |
2888 | ||
2889 | DEBC_printk(STp, "Erasing tape.\n"); | |
2890 | fileno = blkno = at_sm = 0; | |
2891 | break; | |
2892 | case MTSETBLK: /* Set block length */ | |
2893 | case MTSETDENSITY: /* Set tape density */ | |
2894 | case MTSETDRVBUFFER: /* Set drive buffering */ | |
2895 | case SET_DENS_AND_BLK: /* Set density and block size */ | |
2896 | chg_eof = 0; | |
2897 | if (STp->dirty || (STp->buffer)->buffer_bytes != 0) | |
2898 | return (-EIO); /* Not allowed if data in buffer */ | |
2899 | if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && | |
2900 | (arg & MT_ST_BLKSIZE_MASK) != 0 && | |
2901 | STp->max_block > 0 && | |
2902 | ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || | |
2903 | (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { | |
2904 | st_printk(KERN_WARNING, STp, "Illegal block size.\n"); | |
2905 | return (-EINVAL); | |
2906 | } | |
2907 | cmd[0] = MODE_SELECT; | |
2908 | if ((STp->use_pf & USE_PF)) | |
2909 | cmd[1] = MODE_SELECT_PAGE_FORMAT; | |
2910 | cmd[4] = datalen = 12; | |
2911 | direction = DMA_TO_DEVICE; | |
2912 | ||
2913 | memset((STp->buffer)->b_data, 0, 12); | |
2914 | if (cmd_in == MTSETDRVBUFFER) | |
2915 | (STp->buffer)->b_data[2] = (arg & 7) << 4; | |
2916 | else | |
2917 | (STp->buffer)->b_data[2] = | |
2918 | STp->drv_buffer << 4; | |
2919 | (STp->buffer)->b_data[3] = 8; /* block descriptor length */ | |
2920 | if (cmd_in == MTSETDENSITY) { | |
2921 | (STp->buffer)->b_data[4] = arg; | |
2922 | STp->density_changed = 1; /* At least we tried ;-) */ | |
2923 | } else if (cmd_in == SET_DENS_AND_BLK) | |
2924 | (STp->buffer)->b_data[4] = arg >> 24; | |
2925 | else | |
2926 | (STp->buffer)->b_data[4] = STp->density; | |
2927 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { | |
2928 | ltmp = arg & MT_ST_BLKSIZE_MASK; | |
2929 | if (cmd_in == MTSETBLK) | |
2930 | STp->blksize_changed = 1; /* At least we tried ;-) */ | |
2931 | } else | |
2932 | ltmp = STp->block_size; | |
2933 | (STp->buffer)->b_data[9] = (ltmp >> 16); | |
2934 | (STp->buffer)->b_data[10] = (ltmp >> 8); | |
2935 | (STp->buffer)->b_data[11] = ltmp; | |
2936 | timeout = STp->device->request_queue->rq_timeout; | |
2937 | DEBC( | |
2938 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) | |
2939 | st_printk(ST_DEB_MSG, STp, | |
2940 | "Setting block size to %d bytes.\n", | |
2941 | (STp->buffer)->b_data[9] * 65536 + | |
2942 | (STp->buffer)->b_data[10] * 256 + | |
2943 | (STp->buffer)->b_data[11]); | |
2944 | if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) | |
2945 | st_printk(ST_DEB_MSG, STp, | |
2946 | "Setting density code to %x.\n", | |
2947 | (STp->buffer)->b_data[4]); | |
2948 | if (cmd_in == MTSETDRVBUFFER) | |
2949 | st_printk(ST_DEB_MSG, STp, | |
2950 | "Setting drive buffer code to %d.\n", | |
2951 | ((STp->buffer)->b_data[2] >> 4) & 7); | |
2952 | ) | |
2953 | break; | |
2954 | default: | |
2955 | return (-ENOSYS); | |
2956 | } | |
2957 | ||
2958 | SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, | |
2959 | timeout, MAX_RETRIES, 1); | |
2960 | if (!SRpnt) | |
2961 | return (STp->buffer)->syscall_result; | |
2962 | ||
2963 | ioctl_result = (STp->buffer)->syscall_result; | |
2964 | ||
2965 | if (!ioctl_result) { /* SCSI command successful */ | |
2966 | st_release_request(SRpnt); | |
2967 | SRpnt = NULL; | |
2968 | STps->drv_block = blkno; | |
2969 | STps->drv_file = fileno; | |
2970 | STps->at_sm = at_sm; | |
2971 | ||
2972 | if (cmd_in == MTBSFM) | |
2973 | ioctl_result = st_int_ioctl(STp, MTFSF, 1); | |
2974 | else if (cmd_in == MTFSFM) | |
2975 | ioctl_result = st_int_ioctl(STp, MTBSF, 1); | |
2976 | ||
2977 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { | |
2978 | STp->block_size = arg & MT_ST_BLKSIZE_MASK; | |
2979 | if (STp->block_size != 0) { | |
2980 | (STp->buffer)->buffer_blocks = | |
2981 | (STp->buffer)->buffer_size / STp->block_size; | |
2982 | } | |
2983 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; | |
2984 | if (cmd_in == SET_DENS_AND_BLK) | |
2985 | STp->density = arg >> MT_ST_DENSITY_SHIFT; | |
2986 | } else if (cmd_in == MTSETDRVBUFFER) | |
2987 | STp->drv_buffer = (arg & 7); | |
2988 | else if (cmd_in == MTSETDENSITY) | |
2989 | STp->density = arg; | |
2990 | ||
2991 | if (cmd_in == MTEOM) | |
2992 | STps->eof = ST_EOD; | |
2993 | else if (cmd_in == MTFSF) | |
2994 | STps->eof = ST_FM; | |
2995 | else if (chg_eof) | |
2996 | STps->eof = ST_NOEOF; | |
2997 | ||
2998 | if (cmd_in == MTWEOF || cmd_in == MTWEOFI) | |
2999 | STps->rw = ST_IDLE; /* prevent automatic WEOF at close */ | |
3000 | } else { /* SCSI command was not completely successful. Don't return | |
3001 | from this block without releasing the SCSI command block! */ | |
3002 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
3003 | ||
3004 | if (cmdstatp->flags & SENSE_EOM) { | |
3005 | if (cmd_in != MTBSF && cmd_in != MTBSFM && | |
3006 | cmd_in != MTBSR && cmd_in != MTBSS) | |
3007 | STps->eof = ST_EOM_OK; | |
3008 | STps->drv_block = 0; | |
3009 | } | |
3010 | ||
3011 | if (cmdstatp->remainder_valid) | |
3012 | undone = (int)cmdstatp->uremainder64; | |
3013 | else | |
3014 | undone = 0; | |
3015 | ||
3016 | if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) && | |
3017 | cmdstatp->have_sense && | |
3018 | (cmdstatp->flags & SENSE_EOM)) { | |
3019 | if (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
3020 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { | |
3021 | ioctl_result = 0; /* EOF(s) written successfully at EOM */ | |
3022 | STps->eof = ST_NOEOF; | |
3023 | } else { /* Writing EOF(s) failed */ | |
3024 | if (fileno >= 0) | |
3025 | fileno -= undone; | |
3026 | if (undone < arg) | |
3027 | STps->eof = ST_NOEOF; | |
3028 | } | |
3029 | STps->drv_file = fileno; | |
3030 | } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { | |
3031 | if (fileno >= 0) | |
3032 | STps->drv_file = fileno - undone; | |
3033 | else | |
3034 | STps->drv_file = fileno; | |
3035 | STps->drv_block = -1; | |
3036 | STps->eof = ST_NOEOF; | |
3037 | } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { | |
3038 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ | |
3039 | undone = (-undone); | |
3040 | if (STps->drv_file >= 0) | |
3041 | STps->drv_file = fileno + undone; | |
3042 | STps->drv_block = 0; | |
3043 | STps->eof = ST_NOEOF; | |
3044 | } else if (cmd_in == MTFSR) { | |
3045 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ | |
3046 | if (STps->drv_file >= 0) | |
3047 | STps->drv_file++; | |
3048 | STps->drv_block = 0; | |
3049 | STps->eof = ST_FM; | |
3050 | } else { | |
3051 | if (blkno >= undone) | |
3052 | STps->drv_block = blkno - undone; | |
3053 | else | |
3054 | STps->drv_block = (-1); | |
3055 | STps->eof = ST_NOEOF; | |
3056 | } | |
3057 | } else if (cmd_in == MTBSR) { | |
3058 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ | |
3059 | STps->drv_file--; | |
3060 | STps->drv_block = (-1); | |
3061 | } else { | |
3062 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ | |
3063 | undone = (-undone); | |
3064 | if (STps->drv_block >= 0) | |
3065 | STps->drv_block = blkno + undone; | |
3066 | } | |
3067 | STps->eof = ST_NOEOF; | |
3068 | } else if (cmd_in == MTEOM) { | |
3069 | STps->drv_file = (-1); | |
3070 | STps->drv_block = (-1); | |
3071 | STps->eof = ST_EOD; | |
3072 | } else if (cmd_in == MTSETBLK || | |
3073 | cmd_in == MTSETDENSITY || | |
3074 | cmd_in == MTSETDRVBUFFER || | |
3075 | cmd_in == SET_DENS_AND_BLK) { | |
3076 | if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && | |
3077 | !(STp->use_pf & PF_TESTED)) { | |
3078 | /* Try the other possible state of Page Format if not | |
3079 | already tried */ | |
3080 | STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED; | |
3081 | st_release_request(SRpnt); | |
3082 | SRpnt = NULL; | |
3083 | return st_int_ioctl(STp, cmd_in, arg); | |
3084 | } | |
3085 | } else if (chg_eof) | |
3086 | STps->eof = ST_NOEOF; | |
3087 | ||
3088 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) | |
3089 | STps->eof = ST_EOD; | |
3090 | ||
3091 | st_release_request(SRpnt); | |
3092 | SRpnt = NULL; | |
3093 | } | |
3094 | ||
3095 | return ioctl_result; | |
3096 | } | |
3097 | \f | |
3098 | ||
3099 | /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc | |
3100 | structure. */ | |
3101 | ||
3102 | static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, | |
3103 | int logical) | |
3104 | { | |
3105 | int result; | |
3106 | unsigned char scmd[MAX_COMMAND_SIZE]; | |
3107 | struct st_request *SRpnt; | |
3108 | ||
3109 | if (STp->ready != ST_READY) | |
3110 | return (-EIO); | |
3111 | ||
3112 | memset(scmd, 0, MAX_COMMAND_SIZE); | |
3113 | if ((STp->device)->scsi_level < SCSI_2) { | |
3114 | scmd[0] = QFA_REQUEST_BLOCK; | |
3115 | scmd[4] = 3; | |
3116 | } else { | |
3117 | scmd[0] = READ_POSITION; | |
3118 | if (!logical && !STp->scsi2_logical) | |
3119 | scmd[1] = 1; | |
3120 | } | |
3121 | SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, | |
3122 | STp->device->request_queue->rq_timeout, | |
3123 | MAX_READY_RETRIES, 1); | |
3124 | if (!SRpnt) | |
3125 | return (STp->buffer)->syscall_result; | |
3126 | ||
3127 | if ((STp->buffer)->syscall_result != 0 || | |
3128 | (STp->device->scsi_level >= SCSI_2 && | |
3129 | ((STp->buffer)->b_data[0] & 4) != 0)) { | |
3130 | *block = *partition = 0; | |
3131 | DEBC_printk(STp, " Can't read tape position.\n"); | |
3132 | result = (-EIO); | |
3133 | } else { | |
3134 | result = 0; | |
3135 | if ((STp->device)->scsi_level < SCSI_2) { | |
3136 | *block = ((STp->buffer)->b_data[0] << 16) | |
3137 | + ((STp->buffer)->b_data[1] << 8) | |
3138 | + (STp->buffer)->b_data[2]; | |
3139 | *partition = 0; | |
3140 | } else { | |
3141 | *block = ((STp->buffer)->b_data[4] << 24) | |
3142 | + ((STp->buffer)->b_data[5] << 16) | |
3143 | + ((STp->buffer)->b_data[6] << 8) | |
3144 | + (STp->buffer)->b_data[7]; | |
3145 | *partition = (STp->buffer)->b_data[1]; | |
3146 | if (((STp->buffer)->b_data[0] & 0x80) && | |
3147 | (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ | |
3148 | STp->ps[0].drv_block = STp->ps[0].drv_file = 0; | |
3149 | } | |
3150 | DEBC_printk(STp, "Got tape pos. blk %d part %d.\n", | |
3151 | *block, *partition); | |
3152 | } | |
3153 | st_release_request(SRpnt); | |
3154 | SRpnt = NULL; | |
3155 | ||
3156 | return result; | |
3157 | } | |
3158 | ||
3159 | ||
3160 | /* Set the tape block and partition. Negative partition means that only the | |
3161 | block should be set in vendor specific way. */ | |
3162 | static int set_location(struct scsi_tape *STp, unsigned int block, int partition, | |
3163 | int logical) | |
3164 | { | |
3165 | struct st_partstat *STps; | |
3166 | int result, p; | |
3167 | unsigned int blk; | |
3168 | int timeout; | |
3169 | unsigned char scmd[MAX_COMMAND_SIZE]; | |
3170 | struct st_request *SRpnt; | |
3171 | ||
3172 | if (STp->ready != ST_READY) | |
3173 | return (-EIO); | |
3174 | timeout = STp->long_timeout; | |
3175 | STps = &(STp->ps[STp->partition]); | |
3176 | ||
3177 | DEBC_printk(STp, "Setting block to %d and partition to %d.\n", | |
3178 | block, partition); | |
3179 | DEB(if (partition < 0) | |
3180 | return (-EIO); ) | |
3181 | ||
3182 | /* Update the location at the partition we are leaving */ | |
3183 | if ((!STp->can_partitions && partition != 0) || | |
3184 | partition >= ST_NBR_PARTITIONS) | |
3185 | return (-EINVAL); | |
3186 | if (partition != STp->partition) { | |
3187 | if (get_location(STp, &blk, &p, 1)) | |
3188 | STps->last_block_valid = 0; | |
3189 | else { | |
3190 | STps->last_block_valid = 1; | |
3191 | STps->last_block_visited = blk; | |
3192 | DEBC_printk(STp, "Visited block %d for " | |
3193 | "partition %d saved.\n", | |
3194 | blk, STp->partition); | |
3195 | } | |
3196 | } | |
3197 | ||
3198 | memset(scmd, 0, MAX_COMMAND_SIZE); | |
3199 | if ((STp->device)->scsi_level < SCSI_2) { | |
3200 | scmd[0] = QFA_SEEK_BLOCK; | |
3201 | scmd[2] = (block >> 16); | |
3202 | scmd[3] = (block >> 8); | |
3203 | scmd[4] = block; | |
3204 | scmd[5] = 0; | |
3205 | } else { | |
3206 | scmd[0] = SEEK_10; | |
3207 | scmd[3] = (block >> 24); | |
3208 | scmd[4] = (block >> 16); | |
3209 | scmd[5] = (block >> 8); | |
3210 | scmd[6] = block; | |
3211 | if (!logical && !STp->scsi2_logical) | |
3212 | scmd[1] = 4; | |
3213 | if (STp->partition != partition) { | |
3214 | scmd[1] |= 2; | |
3215 | scmd[8] = partition; | |
3216 | DEBC_printk(STp, "Trying to change partition " | |
3217 | "from %d to %d\n", STp->partition, | |
3218 | partition); | |
3219 | } | |
3220 | } | |
3221 | if (STp->immediate) { | |
3222 | scmd[1] |= 1; /* Don't wait for completion */ | |
3223 | timeout = STp->device->request_queue->rq_timeout; | |
3224 | } | |
3225 | ||
3226 | SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, | |
3227 | timeout, MAX_READY_RETRIES, 1); | |
3228 | if (!SRpnt) | |
3229 | return (STp->buffer)->syscall_result; | |
3230 | ||
3231 | STps->drv_block = STps->drv_file = (-1); | |
3232 | STps->eof = ST_NOEOF; | |
3233 | if ((STp->buffer)->syscall_result != 0) { | |
3234 | result = (-EIO); | |
3235 | if (STp->can_partitions && | |
3236 | (STp->device)->scsi_level >= SCSI_2 && | |
3237 | (p = find_partition(STp)) >= 0) | |
3238 | STp->partition = p; | |
3239 | } else { | |
3240 | if (STp->can_partitions) { | |
3241 | STp->partition = partition; | |
3242 | STps = &(STp->ps[partition]); | |
3243 | if (!STps->last_block_valid || | |
3244 | STps->last_block_visited != block) { | |
3245 | STps->at_sm = 0; | |
3246 | STps->rw = ST_IDLE; | |
3247 | } | |
3248 | } else | |
3249 | STps->at_sm = 0; | |
3250 | if (block == 0) | |
3251 | STps->drv_block = STps->drv_file = 0; | |
3252 | result = 0; | |
3253 | } | |
3254 | ||
3255 | st_release_request(SRpnt); | |
3256 | SRpnt = NULL; | |
3257 | ||
3258 | return result; | |
3259 | } | |
3260 | ||
3261 | ||
3262 | /* Find the current partition number for the drive status. Called from open and | |
3263 | returns either partition number of negative error code. */ | |
3264 | static int find_partition(struct scsi_tape *STp) | |
3265 | { | |
3266 | int i, partition; | |
3267 | unsigned int block; | |
3268 | ||
3269 | if ((i = get_location(STp, &block, &partition, 1)) < 0) | |
3270 | return i; | |
3271 | if (partition >= ST_NBR_PARTITIONS) | |
3272 | return (-EIO); | |
3273 | return partition; | |
3274 | } | |
3275 | ||
3276 | ||
3277 | /* Change the partition if necessary */ | |
3278 | static int switch_partition(struct scsi_tape *STp) | |
3279 | { | |
3280 | struct st_partstat *STps; | |
3281 | ||
3282 | if (STp->partition == STp->new_partition) | |
3283 | return 0; | |
3284 | STps = &(STp->ps[STp->new_partition]); | |
3285 | if (!STps->last_block_valid) | |
3286 | STps->last_block_visited = 0; | |
3287 | return set_location(STp, STps->last_block_visited, STp->new_partition, 1); | |
3288 | } | |
3289 | \f | |
3290 | /* Functions for reading and writing the medium partition mode page. */ | |
3291 | ||
3292 | #define PART_PAGE 0x11 | |
3293 | #define PART_PAGE_FIXED_LENGTH 8 | |
3294 | ||
3295 | #define PP_OFF_MAX_ADD_PARTS 2 | |
3296 | #define PP_OFF_NBR_ADD_PARTS 3 | |
3297 | #define PP_OFF_FLAGS 4 | |
3298 | #define PP_OFF_PART_UNITS 6 | |
3299 | #define PP_OFF_RESERVED 7 | |
3300 | ||
3301 | #define PP_BIT_IDP 0x20 | |
3302 | #define PP_BIT_FDP 0x80 | |
3303 | #define PP_MSK_PSUM_MB 0x10 | |
3304 | #define PP_MSK_PSUM_UNITS 0x18 | |
3305 | #define PP_MSK_POFM 0x04 | |
3306 | ||
3307 | /* Get the number of partitions on the tape. As a side effect reads the | |
3308 | mode page into the tape buffer. */ | |
3309 | static int nbr_partitions(struct scsi_tape *STp) | |
3310 | { | |
3311 | int result; | |
3312 | ||
3313 | if (STp->ready != ST_READY) | |
3314 | return (-EIO); | |
3315 | ||
3316 | result = read_mode_page(STp, PART_PAGE, 1); | |
3317 | ||
3318 | if (result) { | |
3319 | DEBC_printk(STp, "Can't read medium partition page.\n"); | |
3320 | result = (-EIO); | |
3321 | } else { | |
3322 | result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + | |
3323 | PP_OFF_NBR_ADD_PARTS] + 1; | |
3324 | DEBC_printk(STp, "Number of partitions %d.\n", result); | |
3325 | } | |
3326 | ||
3327 | return result; | |
3328 | } | |
3329 | ||
3330 | ||
3331 | static int format_medium(struct scsi_tape *STp, int format) | |
3332 | { | |
3333 | int result = 0; | |
3334 | int timeout = STp->long_timeout; | |
3335 | unsigned char scmd[MAX_COMMAND_SIZE]; | |
3336 | struct st_request *SRpnt; | |
3337 | ||
3338 | memset(scmd, 0, MAX_COMMAND_SIZE); | |
3339 | scmd[0] = FORMAT_UNIT; | |
3340 | scmd[2] = format; | |
3341 | if (STp->immediate) { | |
3342 | scmd[1] |= 1; /* Don't wait for completion */ | |
3343 | timeout = STp->device->request_queue->rq_timeout; | |
3344 | } | |
3345 | DEBC_printk(STp, "Sending FORMAT MEDIUM\n"); | |
3346 | SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, | |
3347 | timeout, MAX_RETRIES, 1); | |
3348 | if (!SRpnt) | |
3349 | result = STp->buffer->syscall_result; | |
3350 | return result; | |
3351 | } | |
3352 | ||
3353 | ||
3354 | /* Partition the tape into two partitions if size > 0 or one partition if | |
3355 | size == 0. | |
3356 | ||
3357 | The block descriptors are read and written because Sony SDT-7000 does not | |
3358 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). | |
3359 | ||
3360 | My HP C1533A drive returns only one partition size field. This is used to | |
3361 | set the size of partition 1. There is no size field for the default partition. | |
3362 | Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is | |
3363 | used to set the size of partition 1 (this is what the SCSI-3 standard specifies). | |
3364 | The following algorithm is used to accommodate both drives: if the number of | |
3365 | partition size fields is greater than the maximum number of additional partitions | |
3366 | in the mode page, the second field is used. Otherwise the first field is used. | |
3367 | ||
3368 | For Seagate DDS drives the page length must be 8 when no partitions is defined | |
3369 | and 10 when 1 partition is defined (information from Eric Lee Green). This is | |
3370 | is acceptable also to some other old drives and enforced if the first partition | |
3371 | size field is used for the first additional partition size. | |
3372 | ||
3373 | For drives that advertize SCSI-3 or newer, use the SSC-3 methods. | |
3374 | */ | |
3375 | static int partition_tape(struct scsi_tape *STp, int size) | |
3376 | { | |
3377 | int result; | |
3378 | int target_partition; | |
3379 | bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false; | |
3380 | int pgo, psd_cnt, psdo; | |
3381 | int psum = PP_MSK_PSUM_MB, units = 0; | |
3382 | unsigned char *bp; | |
3383 | ||
3384 | result = read_mode_page(STp, PART_PAGE, 0); | |
3385 | if (result) { | |
3386 | DEBC_printk(STp, "Can't read partition mode page.\n"); | |
3387 | return result; | |
3388 | } | |
3389 | target_partition = 1; | |
3390 | if (size < 0) { | |
3391 | target_partition = 0; | |
3392 | size = -size; | |
3393 | } | |
3394 | ||
3395 | /* The mode page is in the buffer. Let's modify it and write it. */ | |
3396 | bp = (STp->buffer)->b_data; | |
3397 | pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; | |
3398 | DEBC_printk(STp, "Partition page length is %d bytes.\n", | |
3399 | bp[pgo + MP_OFF_PAGE_LENGTH] + 2); | |
3400 | ||
3401 | psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; | |
3402 | ||
3403 | if (scsi3) { | |
3404 | needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0; | |
3405 | if (needs_format && size == 0) { | |
3406 | /* No need to write the mode page when clearing | |
3407 | * partitioning | |
3408 | */ | |
3409 | DEBC_printk(STp, "Formatting tape with one partition.\n"); | |
3410 | result = format_medium(STp, 0); | |
3411 | goto out; | |
3412 | } | |
3413 | if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */ | |
3414 | psd_cnt = 2; | |
3415 | if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) { | |
3416 | /* Use units scaling for large partitions if the device | |
3417 | * suggests it and no precision lost. Required for IBM | |
3418 | * TS1140/50 drives that don't support MB units. | |
3419 | */ | |
3420 | if (size >= 1000 && (size % 1000) == 0) { | |
3421 | size /= 1000; | |
3422 | psum = PP_MSK_PSUM_UNITS; | |
3423 | units = 9; /* GB */ | |
3424 | } | |
3425 | } | |
3426 | /* Try it anyway if too large to specify in MB */ | |
3427 | if (psum == PP_MSK_PSUM_MB && size >= 65534) { | |
3428 | size /= 1000; | |
3429 | psum = PP_MSK_PSUM_UNITS; | |
3430 | units = 9; /* GB */ | |
3431 | } | |
3432 | } | |
3433 | ||
3434 | if (size >= 65535 || /* Does not fit into two bytes */ | |
3435 | (target_partition == 0 && psd_cnt < 2)) { | |
3436 | result = -EINVAL; | |
3437 | goto out; | |
3438 | } | |
3439 | ||
3440 | psdo = pgo + PART_PAGE_FIXED_LENGTH; | |
3441 | /* The second condition is for HP DDS which use only one partition size | |
3442 | * descriptor | |
3443 | */ | |
3444 | if (target_partition > 0 && | |
3445 | (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] || | |
3446 | bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) { | |
3447 | bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */ | |
3448 | psdo += 2; | |
3449 | } | |
3450 | memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); | |
3451 | ||
3452 | DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n", | |
3453 | psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], | |
3454 | bp[pgo + PP_OFF_NBR_ADD_PARTS]); | |
3455 | ||
3456 | if (size == 0) { | |
3457 | bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; | |
3458 | if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) | |
3459 | bp[pgo + MP_OFF_PAGE_LENGTH] = 6; | |
3460 | DEBC_printk(STp, "Formatting tape with one partition.\n"); | |
3461 | } else { | |
3462 | bp[psdo] = (size >> 8) & 0xff; | |
3463 | bp[psdo + 1] = size & 0xff; | |
3464 | if (target_partition == 0) | |
3465 | bp[psdo + 2] = bp[psdo + 3] = 0xff; | |
3466 | bp[pgo + 3] = 1; | |
3467 | if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) | |
3468 | bp[pgo + MP_OFF_PAGE_LENGTH] = 8; | |
3469 | DEBC_printk(STp, | |
3470 | "Formatting tape with two partitions (%i = %d MB).\n", | |
3471 | target_partition, units > 0 ? size * 1000 : size); | |
3472 | } | |
3473 | bp[pgo + PP_OFF_PART_UNITS] = 0; | |
3474 | bp[pgo + PP_OFF_RESERVED] = 0; | |
3475 | if (size != 1 || units != 0) { | |
3476 | bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum | | |
3477 | (bp[pgo + PP_OFF_FLAGS] & 0x07); | |
3478 | bp[pgo + PP_OFF_PART_UNITS] = units; | |
3479 | } else | |
3480 | bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP | | |
3481 | (bp[pgo + PP_OFF_FLAGS] & 0x1f); | |
3482 | bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2; | |
3483 | ||
3484 | result = write_mode_page(STp, PART_PAGE, 1); | |
3485 | ||
3486 | if (!result && needs_format) | |
3487 | result = format_medium(STp, 1); | |
3488 | ||
3489 | if (result) { | |
3490 | st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n"); | |
3491 | result = (-EIO); | |
3492 | } | |
3493 | ||
3494 | out: | |
3495 | return result; | |
3496 | } | |
3497 | \f | |
3498 | ||
3499 | ||
3500 | /* The ioctl command */ | |
3501 | static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) | |
3502 | { | |
3503 | int i, cmd_nr, cmd_type, bt; | |
3504 | int retval = 0; | |
3505 | unsigned int blk; | |
3506 | struct scsi_tape *STp = file->private_data; | |
3507 | struct st_modedef *STm; | |
3508 | struct st_partstat *STps; | |
3509 | void __user *p = (void __user *)arg; | |
3510 | ||
3511 | if (mutex_lock_interruptible(&STp->lock)) | |
3512 | return -ERESTARTSYS; | |
3513 | ||
3514 | DEB( | |
3515 | if (debugging && !STp->in_use) { | |
3516 | st_printk(ST_DEB_MSG, STp, "Incorrect device.\n"); | |
3517 | retval = (-EIO); | |
3518 | goto out; | |
3519 | } ) /* end DEB */ | |
3520 | ||
3521 | STm = &(STp->modes[STp->current_mode]); | |
3522 | STps = &(STp->ps[STp->partition]); | |
3523 | ||
3524 | /* | |
3525 | * If we are in the middle of error recovery, don't let anyone | |
3526 | * else try and use this device. Also, if error recovery fails, it | |
3527 | * may try and take the device offline, in which case all further | |
3528 | * access to the device is prohibited. | |
3529 | */ | |
3530 | retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in, | |
3531 | file->f_flags & O_NDELAY); | |
3532 | if (retval) | |
3533 | goto out; | |
3534 | ||
3535 | cmd_type = _IOC_TYPE(cmd_in); | |
3536 | cmd_nr = _IOC_NR(cmd_in); | |
3537 | ||
3538 | if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { | |
3539 | struct mtop mtc; | |
3540 | ||
3541 | if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { | |
3542 | retval = (-EINVAL); | |
3543 | goto out; | |
3544 | } | |
3545 | ||
3546 | i = copy_from_user(&mtc, p, sizeof(struct mtop)); | |
3547 | if (i) { | |
3548 | retval = (-EFAULT); | |
3549 | goto out; | |
3550 | } | |
3551 | ||
3552 | if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { | |
3553 | st_printk(KERN_WARNING, STp, | |
3554 | "MTSETDRVBUFFER only allowed for root.\n"); | |
3555 | retval = (-EPERM); | |
3556 | goto out; | |
3557 | } | |
3558 | if (!STm->defined && | |
3559 | (mtc.mt_op != MTSETDRVBUFFER && | |
3560 | (mtc.mt_count & MT_ST_OPTIONS) == 0)) { | |
3561 | retval = (-ENXIO); | |
3562 | goto out; | |
3563 | } | |
3564 | ||
3565 | if (!STp->pos_unknown) { | |
3566 | ||
3567 | if (STps->eof == ST_FM_HIT) { | |
3568 | if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || | |
3569 | mtc.mt_op == MTEOM) { | |
3570 | mtc.mt_count -= 1; | |
3571 | if (STps->drv_file >= 0) | |
3572 | STps->drv_file += 1; | |
3573 | } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { | |
3574 | mtc.mt_count += 1; | |
3575 | if (STps->drv_file >= 0) | |
3576 | STps->drv_file += 1; | |
3577 | } | |
3578 | } | |
3579 | ||
3580 | if (mtc.mt_op == MTSEEK) { | |
3581 | /* Old position must be restored if partition will be | |
3582 | changed */ | |
3583 | i = !STp->can_partitions || | |
3584 | (STp->new_partition != STp->partition); | |
3585 | } else { | |
3586 | i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || | |
3587 | mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || | |
3588 | mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || | |
3589 | mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || | |
3590 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || | |
3591 | mtc.mt_op == MTCOMPRESSION; | |
3592 | } | |
3593 | i = flush_buffer(STp, i); | |
3594 | if (i < 0) { | |
3595 | retval = i; | |
3596 | goto out; | |
3597 | } | |
3598 | if (STps->rw == ST_WRITING && | |
3599 | (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || | |
3600 | mtc.mt_op == MTSEEK || | |
3601 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { | |
3602 | i = st_int_ioctl(STp, MTWEOF, 1); | |
3603 | if (i < 0) { | |
3604 | retval = i; | |
3605 | goto out; | |
3606 | } | |
3607 | if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) | |
3608 | mtc.mt_count++; | |
3609 | STps->rw = ST_IDLE; | |
3610 | } | |
3611 | ||
3612 | } else { | |
3613 | /* | |
3614 | * If there was a bus reset, block further access | |
3615 | * to this device. If the user wants to rewind the tape, | |
3616 | * then reset the flag and allow access again. | |
3617 | */ | |
3618 | if (mtc.mt_op != MTREW && | |
3619 | mtc.mt_op != MTOFFL && | |
3620 | mtc.mt_op != MTRETEN && | |
3621 | mtc.mt_op != MTERASE && | |
3622 | mtc.mt_op != MTSEEK && | |
3623 | mtc.mt_op != MTEOM) { | |
3624 | retval = (-EIO); | |
3625 | goto out; | |
3626 | } | |
3627 | reset_state(STp); | |
3628 | /* remove this when the midlevel properly clears was_reset */ | |
3629 | STp->device->was_reset = 0; | |
3630 | } | |
3631 | ||
3632 | if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && | |
3633 | mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && | |
3634 | mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) | |
3635 | STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ | |
3636 | ||
3637 | if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) | |
3638 | do_door_lock(STp, 0); /* Ignore result! */ | |
3639 | ||
3640 | if (mtc.mt_op == MTSETDRVBUFFER && | |
3641 | (mtc.mt_count & MT_ST_OPTIONS) != 0) { | |
3642 | retval = st_set_options(STp, mtc.mt_count); | |
3643 | goto out; | |
3644 | } | |
3645 | ||
3646 | if (mtc.mt_op == MTSETPART) { | |
3647 | if (!STp->can_partitions || | |
3648 | mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { | |
3649 | retval = (-EINVAL); | |
3650 | goto out; | |
3651 | } | |
3652 | if (mtc.mt_count >= STp->nbr_partitions && | |
3653 | (STp->nbr_partitions = nbr_partitions(STp)) < 0) { | |
3654 | retval = (-EIO); | |
3655 | goto out; | |
3656 | } | |
3657 | if (mtc.mt_count >= STp->nbr_partitions) { | |
3658 | retval = (-EINVAL); | |
3659 | goto out; | |
3660 | } | |
3661 | STp->new_partition = mtc.mt_count; | |
3662 | retval = 0; | |
3663 | goto out; | |
3664 | } | |
3665 | ||
3666 | if (mtc.mt_op == MTMKPART) { | |
3667 | if (!STp->can_partitions) { | |
3668 | retval = (-EINVAL); | |
3669 | goto out; | |
3670 | } | |
3671 | i = do_load_unload(STp, file, 1); | |
3672 | if (i < 0) { | |
3673 | retval = i; | |
3674 | goto out; | |
3675 | } | |
3676 | i = partition_tape(STp, mtc.mt_count); | |
3677 | if (i < 0) { | |
3678 | retval = i; | |
3679 | goto out; | |
3680 | } | |
3681 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
3682 | STp->ps[i].rw = ST_IDLE; | |
3683 | STp->ps[i].at_sm = 0; | |
3684 | STp->ps[i].last_block_valid = 0; | |
3685 | } | |
3686 | STp->partition = STp->new_partition = 0; | |
3687 | STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1; | |
3688 | STps->drv_block = STps->drv_file = 0; | |
3689 | retval = 0; | |
3690 | goto out; | |
3691 | } | |
3692 | ||
3693 | if (mtc.mt_op == MTSEEK) { | |
3694 | i = set_location(STp, mtc.mt_count, STp->new_partition, 0); | |
3695 | if (!STp->can_partitions) | |
3696 | STp->ps[0].rw = ST_IDLE; | |
3697 | retval = i; | |
3698 | goto out; | |
3699 | } | |
3700 | ||
3701 | if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { | |
3702 | retval = do_load_unload(STp, file, 0); | |
3703 | goto out; | |
3704 | } | |
3705 | ||
3706 | if (mtc.mt_op == MTLOAD) { | |
3707 | retval = do_load_unload(STp, file, max(1, mtc.mt_count)); | |
3708 | goto out; | |
3709 | } | |
3710 | ||
3711 | if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { | |
3712 | retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); | |
3713 | goto out; | |
3714 | } | |
3715 | ||
3716 | if (STp->can_partitions && STp->ready == ST_READY && | |
3717 | (i = switch_partition(STp)) < 0) { | |
3718 | retval = i; | |
3719 | goto out; | |
3720 | } | |
3721 | ||
3722 | if (mtc.mt_op == MTCOMPRESSION) | |
3723 | retval = st_compression(STp, (mtc.mt_count & 1)); | |
3724 | else | |
3725 | retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); | |
3726 | goto out; | |
3727 | } | |
3728 | if (!STm->defined) { | |
3729 | retval = (-ENXIO); | |
3730 | goto out; | |
3731 | } | |
3732 | ||
3733 | if ((i = flush_buffer(STp, 0)) < 0) { | |
3734 | retval = i; | |
3735 | goto out; | |
3736 | } | |
3737 | if (STp->can_partitions && | |
3738 | (i = switch_partition(STp)) < 0) { | |
3739 | retval = i; | |
3740 | goto out; | |
3741 | } | |
3742 | ||
3743 | if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { | |
3744 | struct mtget mt_status; | |
3745 | ||
3746 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { | |
3747 | retval = (-EINVAL); | |
3748 | goto out; | |
3749 | } | |
3750 | ||
3751 | mt_status.mt_type = STp->tape_type; | |
3752 | mt_status.mt_dsreg = | |
3753 | ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | | |
3754 | ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); | |
3755 | mt_status.mt_blkno = STps->drv_block; | |
3756 | mt_status.mt_fileno = STps->drv_file; | |
3757 | if (STp->block_size != 0) { | |
3758 | if (STps->rw == ST_WRITING) | |
3759 | mt_status.mt_blkno += | |
3760 | (STp->buffer)->buffer_bytes / STp->block_size; | |
3761 | else if (STps->rw == ST_READING) | |
3762 | mt_status.mt_blkno -= | |
3763 | ((STp->buffer)->buffer_bytes + | |
3764 | STp->block_size - 1) / STp->block_size; | |
3765 | } | |
3766 | ||
3767 | mt_status.mt_gstat = 0; | |
3768 | if (STp->drv_write_prot) | |
3769 | mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
3770 | if (mt_status.mt_blkno == 0) { | |
3771 | if (mt_status.mt_fileno == 0) | |
3772 | mt_status.mt_gstat |= GMT_BOT(0xffffffff); | |
3773 | else | |
3774 | mt_status.mt_gstat |= GMT_EOF(0xffffffff); | |
3775 | } | |
3776 | mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); | |
3777 | mt_status.mt_resid = STp->partition; | |
3778 | if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) | |
3779 | mt_status.mt_gstat |= GMT_EOT(0xffffffff); | |
3780 | else if (STps->eof >= ST_EOM_OK) | |
3781 | mt_status.mt_gstat |= GMT_EOD(0xffffffff); | |
3782 | if (STp->density == 1) | |
3783 | mt_status.mt_gstat |= GMT_D_800(0xffffffff); | |
3784 | else if (STp->density == 2) | |
3785 | mt_status.mt_gstat |= GMT_D_1600(0xffffffff); | |
3786 | else if (STp->density == 3) | |
3787 | mt_status.mt_gstat |= GMT_D_6250(0xffffffff); | |
3788 | if (STp->ready == ST_READY) | |
3789 | mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); | |
3790 | if (STp->ready == ST_NO_TAPE) | |
3791 | mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); | |
3792 | if (STps->at_sm) | |
3793 | mt_status.mt_gstat |= GMT_SM(0xffffffff); | |
3794 | if (STm->do_async_writes || | |
3795 | (STm->do_buffer_writes && STp->block_size != 0) || | |
3796 | STp->drv_buffer != 0) | |
3797 | mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); | |
3798 | if (STp->cleaning_req) | |
3799 | mt_status.mt_gstat |= GMT_CLN(0xffffffff); | |
3800 | ||
3801 | i = copy_to_user(p, &mt_status, sizeof(struct mtget)); | |
3802 | if (i) { | |
3803 | retval = (-EFAULT); | |
3804 | goto out; | |
3805 | } | |
3806 | ||
3807 | STp->recover_reg = 0; /* Clear after read */ | |
3808 | retval = 0; | |
3809 | goto out; | |
3810 | } /* End of MTIOCGET */ | |
3811 | if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { | |
3812 | struct mtpos mt_pos; | |
3813 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { | |
3814 | retval = (-EINVAL); | |
3815 | goto out; | |
3816 | } | |
3817 | if ((i = get_location(STp, &blk, &bt, 0)) < 0) { | |
3818 | retval = i; | |
3819 | goto out; | |
3820 | } | |
3821 | mt_pos.mt_blkno = blk; | |
3822 | i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); | |
3823 | if (i) | |
3824 | retval = (-EFAULT); | |
3825 | goto out; | |
3826 | } | |
3827 | mutex_unlock(&STp->lock); | |
3828 | switch (cmd_in) { | |
3829 | case SCSI_IOCTL_GET_IDLUN: | |
3830 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
3831 | break; | |
3832 | default: | |
3833 | if ((cmd_in == SG_IO || | |
3834 | cmd_in == SCSI_IOCTL_SEND_COMMAND || | |
3835 | cmd_in == CDROM_SEND_PACKET) && | |
3836 | !capable(CAP_SYS_RAWIO)) | |
3837 | i = -EPERM; | |
3838 | else | |
3839 | i = scsi_cmd_ioctl(STp->disk->queue, STp->disk, | |
3840 | file->f_mode, cmd_in, p); | |
3841 | if (i != -ENOTTY) | |
3842 | return i; | |
3843 | break; | |
3844 | } | |
3845 | retval = scsi_ioctl(STp->device, cmd_in, p); | |
3846 | if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */ | |
3847 | STp->rew_at_close = 0; | |
3848 | STp->ready = ST_NO_TAPE; | |
3849 | } | |
3850 | return retval; | |
3851 | ||
3852 | out: | |
3853 | mutex_unlock(&STp->lock); | |
3854 | return retval; | |
3855 | } | |
3856 | ||
3857 | #ifdef CONFIG_COMPAT | |
3858 | static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
3859 | { | |
3860 | struct scsi_tape *STp = file->private_data; | |
3861 | struct scsi_device *sdev = STp->device; | |
3862 | int ret = -ENOIOCTLCMD; | |
3863 | if (sdev->host->hostt->compat_ioctl) { | |
3864 | ||
3865 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); | |
3866 | ||
3867 | } | |
3868 | return ret; | |
3869 | } | |
3870 | #endif | |
3871 | ||
3872 | \f | |
3873 | ||
3874 | /* Try to allocate a new tape buffer. Calling function must not hold | |
3875 | dev_arr_lock. */ | |
3876 | static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) | |
3877 | { | |
3878 | struct st_buffer *tb; | |
3879 | ||
3880 | tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC); | |
3881 | if (!tb) { | |
3882 | printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); | |
3883 | return NULL; | |
3884 | } | |
3885 | tb->frp_segs = 0; | |
3886 | tb->use_sg = max_sg; | |
3887 | tb->dma = need_dma; | |
3888 | tb->buffer_size = 0; | |
3889 | ||
3890 | tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *), | |
3891 | GFP_ATOMIC); | |
3892 | if (!tb->reserved_pages) { | |
3893 | kfree(tb); | |
3894 | return NULL; | |
3895 | } | |
3896 | ||
3897 | return tb; | |
3898 | } | |
3899 | ||
3900 | ||
3901 | /* Try to allocate enough space in the tape buffer */ | |
3902 | #define ST_MAX_ORDER 6 | |
3903 | ||
3904 | static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) | |
3905 | { | |
3906 | int segs, max_segs, b_size, order, got; | |
3907 | gfp_t priority; | |
3908 | ||
3909 | if (new_size <= STbuffer->buffer_size) | |
3910 | return 1; | |
3911 | ||
3912 | if (STbuffer->buffer_size <= PAGE_SIZE) | |
3913 | normalize_buffer(STbuffer); /* Avoid extra segment */ | |
3914 | ||
3915 | max_segs = STbuffer->use_sg; | |
3916 | ||
3917 | priority = GFP_KERNEL | __GFP_NOWARN; | |
3918 | if (need_dma) | |
3919 | priority |= GFP_DMA; | |
3920 | ||
3921 | if (STbuffer->cleared) | |
3922 | priority |= __GFP_ZERO; | |
3923 | ||
3924 | if (STbuffer->frp_segs) { | |
3925 | order = STbuffer->reserved_page_order; | |
3926 | b_size = PAGE_SIZE << order; | |
3927 | } else { | |
3928 | for (b_size = PAGE_SIZE, order = 0; | |
3929 | order < ST_MAX_ORDER && | |
3930 | max_segs * (PAGE_SIZE << order) < new_size; | |
3931 | order++, b_size *= 2) | |
3932 | ; /* empty */ | |
3933 | STbuffer->reserved_page_order = order; | |
3934 | } | |
3935 | if (max_segs * (PAGE_SIZE << order) < new_size) { | |
3936 | if (order == ST_MAX_ORDER) | |
3937 | return 0; | |
3938 | normalize_buffer(STbuffer); | |
3939 | return enlarge_buffer(STbuffer, new_size, need_dma); | |
3940 | } | |
3941 | ||
3942 | for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; | |
3943 | segs < max_segs && got < new_size;) { | |
3944 | struct page *page; | |
3945 | ||
3946 | page = alloc_pages(priority, order); | |
3947 | if (!page) { | |
3948 | DEB(STbuffer->buffer_size = got); | |
3949 | normalize_buffer(STbuffer); | |
3950 | return 0; | |
3951 | } | |
3952 | ||
3953 | STbuffer->frp_segs += 1; | |
3954 | got += b_size; | |
3955 | STbuffer->buffer_size = got; | |
3956 | STbuffer->reserved_pages[segs] = page; | |
3957 | segs++; | |
3958 | } | |
3959 | STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); | |
3960 | ||
3961 | return 1; | |
3962 | } | |
3963 | ||
3964 | ||
3965 | /* Make sure that no data from previous user is in the internal buffer */ | |
3966 | static void clear_buffer(struct st_buffer * st_bp) | |
3967 | { | |
3968 | int i; | |
3969 | ||
3970 | for (i=0; i < st_bp->frp_segs; i++) | |
3971 | memset(page_address(st_bp->reserved_pages[i]), 0, | |
3972 | PAGE_SIZE << st_bp->reserved_page_order); | |
3973 | st_bp->cleared = 1; | |
3974 | } | |
3975 | ||
3976 | ||
3977 | /* Release the extra buffer */ | |
3978 | static void normalize_buffer(struct st_buffer * STbuffer) | |
3979 | { | |
3980 | int i, order = STbuffer->reserved_page_order; | |
3981 | ||
3982 | for (i = 0; i < STbuffer->frp_segs; i++) { | |
3983 | __free_pages(STbuffer->reserved_pages[i], order); | |
3984 | STbuffer->buffer_size -= (PAGE_SIZE << order); | |
3985 | } | |
3986 | STbuffer->frp_segs = 0; | |
3987 | STbuffer->sg_segs = 0; | |
3988 | STbuffer->reserved_page_order = 0; | |
3989 | STbuffer->map_data.offset = 0; | |
3990 | } | |
3991 | ||
3992 | ||
3993 | /* Move data from the user buffer to the tape buffer. Returns zero (success) or | |
3994 | negative error code. */ | |
3995 | static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) | |
3996 | { | |
3997 | int i, cnt, res, offset; | |
3998 | int length = PAGE_SIZE << st_bp->reserved_page_order; | |
3999 | ||
4000 | for (i = 0, offset = st_bp->buffer_bytes; | |
4001 | i < st_bp->frp_segs && offset >= length; i++) | |
4002 | offset -= length; | |
4003 | if (i == st_bp->frp_segs) { /* Should never happen */ | |
4004 | printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); | |
4005 | return (-EIO); | |
4006 | } | |
4007 | for (; i < st_bp->frp_segs && do_count > 0; i++) { | |
4008 | struct page *page = st_bp->reserved_pages[i]; | |
4009 | cnt = length - offset < do_count ? length - offset : do_count; | |
4010 | res = copy_from_user(page_address(page) + offset, ubp, cnt); | |
4011 | if (res) | |
4012 | return (-EFAULT); | |
4013 | do_count -= cnt; | |
4014 | st_bp->buffer_bytes += cnt; | |
4015 | ubp += cnt; | |
4016 | offset = 0; | |
4017 | } | |
4018 | if (do_count) /* Should never happen */ | |
4019 | return (-EIO); | |
4020 | ||
4021 | return 0; | |
4022 | } | |
4023 | ||
4024 | ||
4025 | /* Move data from the tape buffer to the user buffer. Returns zero (success) or | |
4026 | negative error code. */ | |
4027 | static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) | |
4028 | { | |
4029 | int i, cnt, res, offset; | |
4030 | int length = PAGE_SIZE << st_bp->reserved_page_order; | |
4031 | ||
4032 | for (i = 0, offset = st_bp->read_pointer; | |
4033 | i < st_bp->frp_segs && offset >= length; i++) | |
4034 | offset -= length; | |
4035 | if (i == st_bp->frp_segs) { /* Should never happen */ | |
4036 | printk(KERN_WARNING "st: from_buffer offset overflow.\n"); | |
4037 | return (-EIO); | |
4038 | } | |
4039 | for (; i < st_bp->frp_segs && do_count > 0; i++) { | |
4040 | struct page *page = st_bp->reserved_pages[i]; | |
4041 | cnt = length - offset < do_count ? length - offset : do_count; | |
4042 | res = copy_to_user(ubp, page_address(page) + offset, cnt); | |
4043 | if (res) | |
4044 | return (-EFAULT); | |
4045 | do_count -= cnt; | |
4046 | st_bp->buffer_bytes -= cnt; | |
4047 | st_bp->read_pointer += cnt; | |
4048 | ubp += cnt; | |
4049 | offset = 0; | |
4050 | } | |
4051 | if (do_count) /* Should never happen */ | |
4052 | return (-EIO); | |
4053 | ||
4054 | return 0; | |
4055 | } | |
4056 | ||
4057 | ||
4058 | /* Move data towards start of buffer */ | |
4059 | static void move_buffer_data(struct st_buffer * st_bp, int offset) | |
4060 | { | |
4061 | int src_seg, dst_seg, src_offset = 0, dst_offset; | |
4062 | int count, total; | |
4063 | int length = PAGE_SIZE << st_bp->reserved_page_order; | |
4064 | ||
4065 | if (offset == 0) | |
4066 | return; | |
4067 | ||
4068 | total=st_bp->buffer_bytes - offset; | |
4069 | for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { | |
4070 | src_offset = offset; | |
4071 | if (src_offset < length) | |
4072 | break; | |
4073 | offset -= length; | |
4074 | } | |
4075 | ||
4076 | st_bp->buffer_bytes = st_bp->read_pointer = total; | |
4077 | for (dst_seg=dst_offset=0; total > 0; ) { | |
4078 | struct page *dpage = st_bp->reserved_pages[dst_seg]; | |
4079 | struct page *spage = st_bp->reserved_pages[src_seg]; | |
4080 | ||
4081 | count = min(length - dst_offset, length - src_offset); | |
4082 | memmove(page_address(dpage) + dst_offset, | |
4083 | page_address(spage) + src_offset, count); | |
4084 | src_offset += count; | |
4085 | if (src_offset >= length) { | |
4086 | src_seg++; | |
4087 | src_offset = 0; | |
4088 | } | |
4089 | dst_offset += count; | |
4090 | if (dst_offset >= length) { | |
4091 | dst_seg++; | |
4092 | dst_offset = 0; | |
4093 | } | |
4094 | total -= count; | |
4095 | } | |
4096 | } | |
4097 | ||
4098 | /* Validate the options from command line or module parameters */ | |
4099 | static void validate_options(void) | |
4100 | { | |
4101 | if (buffer_kbs > 0) | |
4102 | st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; | |
4103 | if (max_sg_segs >= ST_FIRST_SG) | |
4104 | st_max_sg_segs = max_sg_segs; | |
4105 | } | |
4106 | ||
4107 | #ifndef MODULE | |
4108 | /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. | |
4109 | */ | |
4110 | static int __init st_setup(char *str) | |
4111 | { | |
4112 | int i, len, ints[5]; | |
4113 | char *stp; | |
4114 | ||
4115 | stp = get_options(str, ARRAY_SIZE(ints), ints); | |
4116 | ||
4117 | if (ints[0] > 0) { | |
4118 | for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) | |
4119 | if (parms[i].val) | |
4120 | *parms[i].val = ints[i + 1]; | |
4121 | } else { | |
4122 | while (stp != NULL) { | |
4123 | for (i = 0; i < ARRAY_SIZE(parms); i++) { | |
4124 | len = strlen(parms[i].name); | |
4125 | if (!strncmp(stp, parms[i].name, len) && | |
4126 | (*(stp + len) == ':' || *(stp + len) == '=')) { | |
4127 | if (parms[i].val) | |
4128 | *parms[i].val = | |
4129 | simple_strtoul(stp + len + 1, NULL, 0); | |
4130 | else | |
4131 | printk(KERN_WARNING "st: Obsolete parameter %s\n", | |
4132 | parms[i].name); | |
4133 | break; | |
4134 | } | |
4135 | } | |
4136 | if (i >= ARRAY_SIZE(parms)) | |
4137 | printk(KERN_WARNING "st: invalid parameter in '%s'\n", | |
4138 | stp); | |
4139 | stp = strchr(stp, ','); | |
4140 | if (stp) | |
4141 | stp++; | |
4142 | } | |
4143 | } | |
4144 | ||
4145 | validate_options(); | |
4146 | ||
4147 | return 1; | |
4148 | } | |
4149 | ||
4150 | __setup("st=", st_setup); | |
4151 | ||
4152 | #endif | |
4153 | ||
4154 | static const struct file_operations st_fops = | |
4155 | { | |
4156 | .owner = THIS_MODULE, | |
4157 | .read = st_read, | |
4158 | .write = st_write, | |
4159 | .unlocked_ioctl = st_ioctl, | |
4160 | #ifdef CONFIG_COMPAT | |
4161 | .compat_ioctl = st_compat_ioctl, | |
4162 | #endif | |
4163 | .open = st_open, | |
4164 | .flush = st_flush, | |
4165 | .release = st_release, | |
4166 | .llseek = noop_llseek, | |
4167 | }; | |
4168 | ||
4169 | static int create_one_cdev(struct scsi_tape *tape, int mode, int rew) | |
4170 | { | |
4171 | int i, error; | |
4172 | dev_t cdev_devno; | |
4173 | struct cdev *cdev; | |
4174 | struct device *dev; | |
4175 | struct st_modedef *STm = &(tape->modes[mode]); | |
4176 | char name[10]; | |
4177 | int dev_num = tape->index; | |
4178 | ||
4179 | cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew)); | |
4180 | ||
4181 | cdev = cdev_alloc(); | |
4182 | if (!cdev) { | |
4183 | pr_err("st%d: out of memory. Device not attached.\n", dev_num); | |
4184 | error = -ENOMEM; | |
4185 | goto out; | |
4186 | } | |
4187 | cdev->owner = THIS_MODULE; | |
4188 | cdev->ops = &st_fops; | |
4189 | STm->cdevs[rew] = cdev; | |
4190 | ||
4191 | error = cdev_add(cdev, cdev_devno, 1); | |
4192 | if (error) { | |
4193 | pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num, | |
4194 | rew ? "non" : "auto", mode); | |
4195 | pr_err("st%d: Device not attached.\n", dev_num); | |
4196 | goto out_free; | |
4197 | } | |
4198 | ||
4199 | i = mode << (4 - ST_NBR_MODE_BITS); | |
4200 | snprintf(name, 10, "%s%s%s", rew ? "n" : "", | |
4201 | tape->disk->disk_name, st_formats[i]); | |
4202 | ||
4203 | dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev, | |
4204 | cdev_devno, &tape->modes[mode], "%s", name); | |
4205 | if (IS_ERR(dev)) { | |
4206 | pr_err("st%d: device_create failed\n", dev_num); | |
4207 | error = PTR_ERR(dev); | |
4208 | goto out_free; | |
4209 | } | |
4210 | ||
4211 | STm->devs[rew] = dev; | |
4212 | ||
4213 | return 0; | |
4214 | out_free: | |
4215 | cdev_del(STm->cdevs[rew]); | |
4216 | out: | |
4217 | STm->cdevs[rew] = NULL; | |
4218 | STm->devs[rew] = NULL; | |
4219 | return error; | |
4220 | } | |
4221 | ||
4222 | static int create_cdevs(struct scsi_tape *tape) | |
4223 | { | |
4224 | int mode, error; | |
4225 | for (mode = 0; mode < ST_NBR_MODES; ++mode) { | |
4226 | error = create_one_cdev(tape, mode, 0); | |
4227 | if (error) | |
4228 | return error; | |
4229 | error = create_one_cdev(tape, mode, 1); | |
4230 | if (error) | |
4231 | return error; | |
4232 | } | |
4233 | ||
4234 | return sysfs_create_link(&tape->device->sdev_gendev.kobj, | |
4235 | &tape->modes[0].devs[0]->kobj, "tape"); | |
4236 | } | |
4237 | ||
4238 | static void remove_cdevs(struct scsi_tape *tape) | |
4239 | { | |
4240 | int mode, rew; | |
4241 | sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape"); | |
4242 | for (mode = 0; mode < ST_NBR_MODES; mode++) { | |
4243 | struct st_modedef *STm = &(tape->modes[mode]); | |
4244 | for (rew = 0; rew < 2; rew++) { | |
4245 | if (STm->cdevs[rew]) | |
4246 | cdev_del(STm->cdevs[rew]); | |
4247 | if (STm->devs[rew]) | |
4248 | device_unregister(STm->devs[rew]); | |
4249 | } | |
4250 | } | |
4251 | } | |
4252 | ||
4253 | static int st_probe(struct device *dev) | |
4254 | { | |
4255 | struct scsi_device *SDp = to_scsi_device(dev); | |
4256 | struct gendisk *disk = NULL; | |
4257 | struct scsi_tape *tpnt = NULL; | |
4258 | struct st_modedef *STm; | |
4259 | struct st_partstat *STps; | |
4260 | struct st_buffer *buffer; | |
4261 | int i, error; | |
4262 | char *stp; | |
4263 | ||
4264 | if (SDp->type != TYPE_TAPE) | |
4265 | return -ENODEV; | |
4266 | if ((stp = st_incompatible(SDp))) { | |
4267 | sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n"); | |
4268 | sdev_printk(KERN_INFO, SDp, | |
4269 | "st: The suggested driver is %s.\n", stp); | |
4270 | return -ENODEV; | |
4271 | } | |
4272 | ||
4273 | scsi_autopm_get_device(SDp); | |
4274 | i = queue_max_segments(SDp->request_queue); | |
4275 | if (st_max_sg_segs < i) | |
4276 | i = st_max_sg_segs; | |
4277 | buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i); | |
4278 | if (buffer == NULL) { | |
4279 | sdev_printk(KERN_ERR, SDp, | |
4280 | "st: Can't allocate new tape buffer. " | |
4281 | "Device not attached.\n"); | |
4282 | goto out; | |
4283 | } | |
4284 | ||
4285 | disk = alloc_disk(1); | |
4286 | if (!disk) { | |
4287 | sdev_printk(KERN_ERR, SDp, | |
4288 | "st: out of memory. Device not attached.\n"); | |
4289 | goto out_buffer_free; | |
4290 | } | |
4291 | ||
4292 | tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC); | |
4293 | if (tpnt == NULL) { | |
4294 | sdev_printk(KERN_ERR, SDp, | |
4295 | "st: Can't allocate device descriptor.\n"); | |
4296 | goto out_put_disk; | |
4297 | } | |
4298 | kref_init(&tpnt->kref); | |
4299 | tpnt->disk = disk; | |
4300 | disk->private_data = &tpnt->driver; | |
4301 | disk->queue = SDp->request_queue; | |
4302 | /* SCSI tape doesn't register this gendisk via add_disk(). Manually | |
4303 | * take queue reference that release_disk() expects. */ | |
4304 | if (!blk_get_queue(disk->queue)) | |
4305 | goto out_put_disk; | |
4306 | tpnt->driver = &st_template; | |
4307 | ||
4308 | tpnt->device = SDp; | |
4309 | if (SDp->scsi_level <= 2) | |
4310 | tpnt->tape_type = MT_ISSCSI1; | |
4311 | else | |
4312 | tpnt->tape_type = MT_ISSCSI2; | |
4313 | ||
4314 | tpnt->buffer = buffer; | |
4315 | tpnt->buffer->last_SRpnt = NULL; | |
4316 | ||
4317 | tpnt->inited = 0; | |
4318 | tpnt->dirty = 0; | |
4319 | tpnt->in_use = 0; | |
4320 | tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ | |
4321 | tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; | |
4322 | tpnt->use_pf = (SDp->scsi_level >= SCSI_2); | |
4323 | tpnt->density = 0; | |
4324 | tpnt->do_auto_lock = ST_AUTO_LOCK; | |
4325 | tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ | |
4326 | tpnt->can_partitions = 0; | |
4327 | tpnt->two_fm = ST_TWO_FM; | |
4328 | tpnt->fast_mteom = ST_FAST_MTEOM; | |
4329 | tpnt->scsi2_logical = ST_SCSI2LOGICAL; | |
4330 | tpnt->sili = ST_SILI; | |
4331 | tpnt->immediate = ST_NOWAIT; | |
4332 | tpnt->immediate_filemark = 0; | |
4333 | tpnt->default_drvbuffer = 0xff; /* No forced buffering */ | |
4334 | tpnt->partition = 0; | |
4335 | tpnt->new_partition = 0; | |
4336 | tpnt->nbr_partitions = 0; | |
4337 | blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT); | |
4338 | tpnt->long_timeout = ST_LONG_TIMEOUT; | |
4339 | tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; | |
4340 | ||
4341 | for (i = 0; i < ST_NBR_MODES; i++) { | |
4342 | STm = &(tpnt->modes[i]); | |
4343 | STm->defined = 0; | |
4344 | STm->sysv = ST_SYSV; | |
4345 | STm->defaults_for_writes = 0; | |
4346 | STm->do_async_writes = ST_ASYNC_WRITES; | |
4347 | STm->do_buffer_writes = ST_BUFFER_WRITES; | |
4348 | STm->do_read_ahead = ST_READ_AHEAD; | |
4349 | STm->default_compression = ST_DONT_TOUCH; | |
4350 | STm->default_blksize = (-1); /* No forced size */ | |
4351 | STm->default_density = (-1); /* No forced density */ | |
4352 | STm->tape = tpnt; | |
4353 | } | |
4354 | ||
4355 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
4356 | STps = &(tpnt->ps[i]); | |
4357 | STps->rw = ST_IDLE; | |
4358 | STps->eof = ST_NOEOF; | |
4359 | STps->at_sm = 0; | |
4360 | STps->last_block_valid = 0; | |
4361 | STps->drv_block = (-1); | |
4362 | STps->drv_file = (-1); | |
4363 | } | |
4364 | ||
4365 | tpnt->current_mode = 0; | |
4366 | tpnt->modes[0].defined = 1; | |
4367 | ||
4368 | tpnt->density_changed = tpnt->compression_changed = | |
4369 | tpnt->blksize_changed = 0; | |
4370 | mutex_init(&tpnt->lock); | |
4371 | ||
4372 | idr_preload(GFP_KERNEL); | |
4373 | spin_lock(&st_index_lock); | |
4374 | error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT); | |
4375 | spin_unlock(&st_index_lock); | |
4376 | idr_preload_end(); | |
4377 | if (error < 0) { | |
4378 | pr_warn("st: idr allocation failed: %d\n", error); | |
4379 | goto out_put_queue; | |
4380 | } | |
4381 | tpnt->index = error; | |
4382 | sprintf(disk->disk_name, "st%d", tpnt->index); | |
4383 | tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL); | |
4384 | if (tpnt->stats == NULL) { | |
4385 | sdev_printk(KERN_ERR, SDp, | |
4386 | "st: Can't allocate statistics.\n"); | |
4387 | goto out_idr_remove; | |
4388 | } | |
4389 | ||
4390 | dev_set_drvdata(dev, tpnt); | |
4391 | ||
4392 | ||
4393 | error = create_cdevs(tpnt); | |
4394 | if (error) | |
4395 | goto out_remove_devs; | |
4396 | scsi_autopm_put_device(SDp); | |
4397 | ||
4398 | sdev_printk(KERN_NOTICE, SDp, | |
4399 | "Attached scsi tape %s\n", tape_name(tpnt)); | |
4400 | sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n", | |
4401 | tape_name(tpnt), tpnt->try_dio ? "yes" : "no", | |
4402 | queue_dma_alignment(SDp->request_queue) + 1); | |
4403 | ||
4404 | return 0; | |
4405 | ||
4406 | out_remove_devs: | |
4407 | remove_cdevs(tpnt); | |
4408 | kfree(tpnt->stats); | |
4409 | out_idr_remove: | |
4410 | spin_lock(&st_index_lock); | |
4411 | idr_remove(&st_index_idr, tpnt->index); | |
4412 | spin_unlock(&st_index_lock); | |
4413 | out_put_queue: | |
4414 | blk_put_queue(disk->queue); | |
4415 | out_put_disk: | |
4416 | put_disk(disk); | |
4417 | kfree(tpnt); | |
4418 | out_buffer_free: | |
4419 | kfree(buffer); | |
4420 | out: | |
4421 | scsi_autopm_put_device(SDp); | |
4422 | return -ENODEV; | |
4423 | }; | |
4424 | ||
4425 | ||
4426 | static int st_remove(struct device *dev) | |
4427 | { | |
4428 | struct scsi_tape *tpnt = dev_get_drvdata(dev); | |
4429 | int index = tpnt->index; | |
4430 | ||
4431 | scsi_autopm_get_device(to_scsi_device(dev)); | |
4432 | remove_cdevs(tpnt); | |
4433 | ||
4434 | mutex_lock(&st_ref_mutex); | |
4435 | kref_put(&tpnt->kref, scsi_tape_release); | |
4436 | mutex_unlock(&st_ref_mutex); | |
4437 | spin_lock(&st_index_lock); | |
4438 | idr_remove(&st_index_idr, index); | |
4439 | spin_unlock(&st_index_lock); | |
4440 | return 0; | |
4441 | } | |
4442 | ||
4443 | /** | |
4444 | * scsi_tape_release - Called to free the Scsi_Tape structure | |
4445 | * @kref: pointer to embedded kref | |
4446 | * | |
4447 | * st_ref_mutex must be held entering this routine. Because it is | |
4448 | * called on last put, you should always use the scsi_tape_get() | |
4449 | * scsi_tape_put() helpers which manipulate the semaphore directly | |
4450 | * and never do a direct kref_put(). | |
4451 | **/ | |
4452 | static void scsi_tape_release(struct kref *kref) | |
4453 | { | |
4454 | struct scsi_tape *tpnt = to_scsi_tape(kref); | |
4455 | struct gendisk *disk = tpnt->disk; | |
4456 | ||
4457 | tpnt->device = NULL; | |
4458 | ||
4459 | if (tpnt->buffer) { | |
4460 | normalize_buffer(tpnt->buffer); | |
4461 | kfree(tpnt->buffer->reserved_pages); | |
4462 | kfree(tpnt->buffer); | |
4463 | } | |
4464 | ||
4465 | disk->private_data = NULL; | |
4466 | put_disk(disk); | |
4467 | kfree(tpnt->stats); | |
4468 | kfree(tpnt); | |
4469 | return; | |
4470 | } | |
4471 | ||
4472 | static struct class st_sysfs_class = { | |
4473 | .name = "scsi_tape", | |
4474 | .dev_groups = st_dev_groups, | |
4475 | }; | |
4476 | ||
4477 | static int __init init_st(void) | |
4478 | { | |
4479 | int err; | |
4480 | ||
4481 | validate_options(); | |
4482 | ||
4483 | printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n", | |
4484 | verstr, st_fixed_buffer_size, st_max_sg_segs); | |
4485 | ||
4486 | debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG; | |
4487 | if (debugging) { | |
4488 | printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n", | |
4489 | debugging); | |
4490 | } | |
4491 | ||
4492 | err = class_register(&st_sysfs_class); | |
4493 | if (err) { | |
4494 | pr_err("Unable register sysfs class for SCSI tapes\n"); | |
4495 | return err; | |
4496 | } | |
4497 | ||
4498 | err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), | |
4499 | ST_MAX_TAPE_ENTRIES, "st"); | |
4500 | if (err) { | |
4501 | printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", | |
4502 | SCSI_TAPE_MAJOR); | |
4503 | goto err_class; | |
4504 | } | |
4505 | ||
4506 | err = scsi_register_driver(&st_template.gendrv); | |
4507 | if (err) | |
4508 | goto err_chrdev; | |
4509 | ||
4510 | return 0; | |
4511 | ||
4512 | err_chrdev: | |
4513 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), | |
4514 | ST_MAX_TAPE_ENTRIES); | |
4515 | err_class: | |
4516 | class_unregister(&st_sysfs_class); | |
4517 | return err; | |
4518 | } | |
4519 | ||
4520 | static void __exit exit_st(void) | |
4521 | { | |
4522 | scsi_unregister_driver(&st_template.gendrv); | |
4523 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), | |
4524 | ST_MAX_TAPE_ENTRIES); | |
4525 | class_unregister(&st_sysfs_class); | |
4526 | idr_destroy(&st_index_idr); | |
4527 | printk(KERN_INFO "st: Unloaded.\n"); | |
4528 | } | |
4529 | ||
4530 | module_init(init_st); | |
4531 | module_exit(exit_st); | |
4532 | ||
4533 | ||
4534 | /* The sysfs driver interface. Read-only at the moment */ | |
4535 | static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf) | |
4536 | { | |
4537 | return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); | |
4538 | } | |
4539 | static DRIVER_ATTR_RO(try_direct_io); | |
4540 | ||
4541 | static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf) | |
4542 | { | |
4543 | return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); | |
4544 | } | |
4545 | static DRIVER_ATTR_RO(fixed_buffer_size); | |
4546 | ||
4547 | static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf) | |
4548 | { | |
4549 | return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); | |
4550 | } | |
4551 | static DRIVER_ATTR_RO(max_sg_segs); | |
4552 | ||
4553 | static ssize_t version_show(struct device_driver *ddd, char *buf) | |
4554 | { | |
4555 | return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr); | |
4556 | } | |
4557 | static DRIVER_ATTR_RO(version); | |
4558 | ||
4559 | #if DEBUG | |
4560 | static ssize_t debug_flag_store(struct device_driver *ddp, | |
4561 | const char *buf, size_t count) | |
4562 | { | |
4563 | /* We only care what the first byte of the data is the rest is unused. | |
4564 | * if it's a '1' we turn on debug and if it's a '0' we disable it. All | |
4565 | * other values have -EINVAL returned if they are passed in. | |
4566 | */ | |
4567 | if (count > 0) { | |
4568 | if (buf[0] == '0') { | |
4569 | debugging = NO_DEBUG; | |
4570 | return count; | |
4571 | } else if (buf[0] == '1') { | |
4572 | debugging = 1; | |
4573 | return count; | |
4574 | } | |
4575 | } | |
4576 | return -EINVAL; | |
4577 | } | |
4578 | ||
4579 | static ssize_t debug_flag_show(struct device_driver *ddp, char *buf) | |
4580 | { | |
4581 | return scnprintf(buf, PAGE_SIZE, "%d\n", debugging); | |
4582 | } | |
4583 | static DRIVER_ATTR_RW(debug_flag); | |
4584 | #endif | |
4585 | ||
4586 | static struct attribute *st_drv_attrs[] = { | |
4587 | &driver_attr_try_direct_io.attr, | |
4588 | &driver_attr_fixed_buffer_size.attr, | |
4589 | &driver_attr_max_sg_segs.attr, | |
4590 | &driver_attr_version.attr, | |
4591 | #if DEBUG | |
4592 | &driver_attr_debug_flag.attr, | |
4593 | #endif | |
4594 | NULL, | |
4595 | }; | |
4596 | ATTRIBUTE_GROUPS(st_drv); | |
4597 | ||
4598 | /* The sysfs simple class interface */ | |
4599 | static ssize_t | |
4600 | defined_show(struct device *dev, struct device_attribute *attr, char *buf) | |
4601 | { | |
4602 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4603 | ssize_t l = 0; | |
4604 | ||
4605 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); | |
4606 | return l; | |
4607 | } | |
4608 | static DEVICE_ATTR_RO(defined); | |
4609 | ||
4610 | static ssize_t | |
4611 | default_blksize_show(struct device *dev, struct device_attribute *attr, | |
4612 | char *buf) | |
4613 | { | |
4614 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4615 | ssize_t l = 0; | |
4616 | ||
4617 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); | |
4618 | return l; | |
4619 | } | |
4620 | static DEVICE_ATTR_RO(default_blksize); | |
4621 | ||
4622 | static ssize_t | |
4623 | default_density_show(struct device *dev, struct device_attribute *attr, | |
4624 | char *buf) | |
4625 | { | |
4626 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4627 | ssize_t l = 0; | |
4628 | char *fmt; | |
4629 | ||
4630 | fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; | |
4631 | l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); | |
4632 | return l; | |
4633 | } | |
4634 | static DEVICE_ATTR_RO(default_density); | |
4635 | ||
4636 | static ssize_t | |
4637 | default_compression_show(struct device *dev, struct device_attribute *attr, | |
4638 | char *buf) | |
4639 | { | |
4640 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4641 | ssize_t l = 0; | |
4642 | ||
4643 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); | |
4644 | return l; | |
4645 | } | |
4646 | static DEVICE_ATTR_RO(default_compression); | |
4647 | ||
4648 | static ssize_t | |
4649 | options_show(struct device *dev, struct device_attribute *attr, char *buf) | |
4650 | { | |
4651 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4652 | struct scsi_tape *STp = STm->tape; | |
4653 | int options; | |
4654 | ssize_t l = 0; | |
4655 | ||
4656 | options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; | |
4657 | options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; | |
4658 | options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; | |
4659 | DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); | |
4660 | options |= STp->two_fm ? MT_ST_TWO_FM : 0; | |
4661 | options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; | |
4662 | options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; | |
4663 | options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; | |
4664 | options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; | |
4665 | options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; | |
4666 | options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; | |
4667 | options |= STm->sysv ? MT_ST_SYSV : 0; | |
4668 | options |= STp->immediate ? MT_ST_NOWAIT : 0; | |
4669 | options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0; | |
4670 | options |= STp->sili ? MT_ST_SILI : 0; | |
4671 | ||
4672 | l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); | |
4673 | return l; | |
4674 | } | |
4675 | static DEVICE_ATTR_RO(options); | |
4676 | ||
4677 | /* Support for tape stats */ | |
4678 | ||
4679 | /** | |
4680 | * read_cnt_show - return read count - count of reads made from tape drive | |
4681 | * @dev: struct device | |
4682 | * @attr: attribute structure | |
4683 | * @buf: buffer to return formatted data in | |
4684 | */ | |
4685 | static ssize_t read_cnt_show(struct device *dev, | |
4686 | struct device_attribute *attr, char *buf) | |
4687 | { | |
4688 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4689 | ||
4690 | return sprintf(buf, "%lld", | |
4691 | (long long)atomic64_read(&STm->tape->stats->read_cnt)); | |
4692 | } | |
4693 | static DEVICE_ATTR_RO(read_cnt); | |
4694 | ||
4695 | /** | |
4696 | * read_byte_cnt_show - return read byte count - tape drives | |
4697 | * may use blocks less than 512 bytes this gives the raw byte count of | |
4698 | * of data read from the tape drive. | |
4699 | * @dev: struct device | |
4700 | * @attr: attribute structure | |
4701 | * @buf: buffer to return formatted data in | |
4702 | */ | |
4703 | static ssize_t read_byte_cnt_show(struct device *dev, | |
4704 | struct device_attribute *attr, char *buf) | |
4705 | { | |
4706 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4707 | ||
4708 | return sprintf(buf, "%lld", | |
4709 | (long long)atomic64_read(&STm->tape->stats->read_byte_cnt)); | |
4710 | } | |
4711 | static DEVICE_ATTR_RO(read_byte_cnt); | |
4712 | ||
4713 | /** | |
4714 | * read_us_show - return read us - overall time spent waiting on reads in ns. | |
4715 | * @dev: struct device | |
4716 | * @attr: attribute structure | |
4717 | * @buf: buffer to return formatted data in | |
4718 | */ | |
4719 | static ssize_t read_ns_show(struct device *dev, | |
4720 | struct device_attribute *attr, char *buf) | |
4721 | { | |
4722 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4723 | ||
4724 | return sprintf(buf, "%lld", | |
4725 | (long long)atomic64_read(&STm->tape->stats->tot_read_time)); | |
4726 | } | |
4727 | static DEVICE_ATTR_RO(read_ns); | |
4728 | ||
4729 | /** | |
4730 | * write_cnt_show - write count - number of user calls | |
4731 | * to write(2) that have written data to tape. | |
4732 | * @dev: struct device | |
4733 | * @attr: attribute structure | |
4734 | * @buf: buffer to return formatted data in | |
4735 | */ | |
4736 | static ssize_t write_cnt_show(struct device *dev, | |
4737 | struct device_attribute *attr, char *buf) | |
4738 | { | |
4739 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4740 | ||
4741 | return sprintf(buf, "%lld", | |
4742 | (long long)atomic64_read(&STm->tape->stats->write_cnt)); | |
4743 | } | |
4744 | static DEVICE_ATTR_RO(write_cnt); | |
4745 | ||
4746 | /** | |
4747 | * write_byte_cnt_show - write byte count - raw count of | |
4748 | * bytes written to tape. | |
4749 | * @dev: struct device | |
4750 | * @attr: attribute structure | |
4751 | * @buf: buffer to return formatted data in | |
4752 | */ | |
4753 | static ssize_t write_byte_cnt_show(struct device *dev, | |
4754 | struct device_attribute *attr, char *buf) | |
4755 | { | |
4756 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4757 | ||
4758 | return sprintf(buf, "%lld", | |
4759 | (long long)atomic64_read(&STm->tape->stats->write_byte_cnt)); | |
4760 | } | |
4761 | static DEVICE_ATTR_RO(write_byte_cnt); | |
4762 | ||
4763 | /** | |
4764 | * write_ns_show - write ns - number of nanoseconds waiting on write | |
4765 | * requests to complete. | |
4766 | * @dev: struct device | |
4767 | * @attr: attribute structure | |
4768 | * @buf: buffer to return formatted data in | |
4769 | */ | |
4770 | static ssize_t write_ns_show(struct device *dev, | |
4771 | struct device_attribute *attr, char *buf) | |
4772 | { | |
4773 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4774 | ||
4775 | return sprintf(buf, "%lld", | |
4776 | (long long)atomic64_read(&STm->tape->stats->tot_write_time)); | |
4777 | } | |
4778 | static DEVICE_ATTR_RO(write_ns); | |
4779 | ||
4780 | /** | |
4781 | * in_flight_show - number of I/Os currently in flight - | |
4782 | * in most cases this will be either 0 or 1. It may be higher if someone | |
4783 | * has also issued other SCSI commands such as via an ioctl. | |
4784 | * @dev: struct device | |
4785 | * @attr: attribute structure | |
4786 | * @buf: buffer to return formatted data in | |
4787 | */ | |
4788 | static ssize_t in_flight_show(struct device *dev, | |
4789 | struct device_attribute *attr, char *buf) | |
4790 | { | |
4791 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4792 | ||
4793 | return sprintf(buf, "%lld", | |
4794 | (long long)atomic64_read(&STm->tape->stats->in_flight)); | |
4795 | } | |
4796 | static DEVICE_ATTR_RO(in_flight); | |
4797 | ||
4798 | /** | |
4799 | * io_ns_show - io wait ns - this is the number of ns spent | |
4800 | * waiting on all I/O to complete. This includes tape movement commands | |
4801 | * such as rewinding, seeking to end of file or tape, it also includes | |
4802 | * read and write. To determine the time spent on tape movement | |
4803 | * subtract the read and write ns from this value. | |
4804 | * @dev: struct device | |
4805 | * @attr: attribute structure | |
4806 | * @buf: buffer to return formatted data in | |
4807 | */ | |
4808 | static ssize_t io_ns_show(struct device *dev, | |
4809 | struct device_attribute *attr, char *buf) | |
4810 | { | |
4811 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4812 | ||
4813 | return sprintf(buf, "%lld", | |
4814 | (long long)atomic64_read(&STm->tape->stats->tot_io_time)); | |
4815 | } | |
4816 | static DEVICE_ATTR_RO(io_ns); | |
4817 | ||
4818 | /** | |
4819 | * other_cnt_show - other io count - this is the number of | |
4820 | * I/O requests other than read and write requests. | |
4821 | * Typically these are tape movement requests but will include driver | |
4822 | * tape movement. This includes only requests issued by the st driver. | |
4823 | * @dev: struct device | |
4824 | * @attr: attribute structure | |
4825 | * @buf: buffer to return formatted data in | |
4826 | */ | |
4827 | static ssize_t other_cnt_show(struct device *dev, | |
4828 | struct device_attribute *attr, char *buf) | |
4829 | { | |
4830 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4831 | ||
4832 | return sprintf(buf, "%lld", | |
4833 | (long long)atomic64_read(&STm->tape->stats->other_cnt)); | |
4834 | } | |
4835 | static DEVICE_ATTR_RO(other_cnt); | |
4836 | ||
4837 | /** | |
4838 | * resid_cnt_show - A count of the number of times we get a residual | |
4839 | * count - this should indicate someone issuing reads larger than the | |
4840 | * block size on tape. | |
4841 | * @dev: struct device | |
4842 | * @attr: attribute structure | |
4843 | * @buf: buffer to return formatted data in | |
4844 | */ | |
4845 | static ssize_t resid_cnt_show(struct device *dev, | |
4846 | struct device_attribute *attr, char *buf) | |
4847 | { | |
4848 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4849 | ||
4850 | return sprintf(buf, "%lld", | |
4851 | (long long)atomic64_read(&STm->tape->stats->resid_cnt)); | |
4852 | } | |
4853 | static DEVICE_ATTR_RO(resid_cnt); | |
4854 | ||
4855 | static struct attribute *st_dev_attrs[] = { | |
4856 | &dev_attr_defined.attr, | |
4857 | &dev_attr_default_blksize.attr, | |
4858 | &dev_attr_default_density.attr, | |
4859 | &dev_attr_default_compression.attr, | |
4860 | &dev_attr_options.attr, | |
4861 | NULL, | |
4862 | }; | |
4863 | ||
4864 | static struct attribute *st_stats_attrs[] = { | |
4865 | &dev_attr_read_cnt.attr, | |
4866 | &dev_attr_read_byte_cnt.attr, | |
4867 | &dev_attr_read_ns.attr, | |
4868 | &dev_attr_write_cnt.attr, | |
4869 | &dev_attr_write_byte_cnt.attr, | |
4870 | &dev_attr_write_ns.attr, | |
4871 | &dev_attr_in_flight.attr, | |
4872 | &dev_attr_io_ns.attr, | |
4873 | &dev_attr_other_cnt.attr, | |
4874 | &dev_attr_resid_cnt.attr, | |
4875 | NULL, | |
4876 | }; | |
4877 | ||
4878 | static struct attribute_group stats_group = { | |
4879 | .name = "stats", | |
4880 | .attrs = st_stats_attrs, | |
4881 | }; | |
4882 | ||
4883 | static struct attribute_group st_group = { | |
4884 | .attrs = st_dev_attrs, | |
4885 | }; | |
4886 | ||
4887 | static const struct attribute_group *st_dev_groups[] = { | |
4888 | &st_group, | |
4889 | &stats_group, | |
4890 | NULL, | |
4891 | }; | |
4892 | ||
4893 | /* The following functions may be useful for a larger audience. */ | |
4894 | static int sgl_map_user_pages(struct st_buffer *STbp, | |
4895 | const unsigned int max_pages, unsigned long uaddr, | |
4896 | size_t count, int rw) | |
4897 | { | |
4898 | unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
4899 | unsigned long start = uaddr >> PAGE_SHIFT; | |
4900 | const int nr_pages = end - start; | |
4901 | int res, i, j; | |
4902 | struct page **pages; | |
4903 | struct rq_map_data *mdata = &STbp->map_data; | |
4904 | ||
4905 | /* User attempted Overflow! */ | |
4906 | if ((uaddr + count) < uaddr) | |
4907 | return -EINVAL; | |
4908 | ||
4909 | /* Too big */ | |
4910 | if (nr_pages > max_pages) | |
4911 | return -ENOMEM; | |
4912 | ||
4913 | /* Hmm? */ | |
4914 | if (count == 0) | |
4915 | return 0; | |
4916 | ||
4917 | if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL) | |
4918 | return -ENOMEM; | |
4919 | ||
4920 | /* Try to fault in all of the necessary pages */ | |
4921 | /* rw==READ means read from drive, write into memory area */ | |
4922 | res = get_user_pages_unlocked( | |
4923 | uaddr, | |
4924 | nr_pages, | |
4925 | pages, | |
4926 | rw == READ ? FOLL_WRITE : 0); /* don't force */ | |
4927 | ||
4928 | /* Errors and no page mapped should return here */ | |
4929 | if (res < nr_pages) | |
4930 | goto out_unmap; | |
4931 | ||
4932 | for (i=0; i < nr_pages; i++) { | |
4933 | /* FIXME: flush superflous for rw==READ, | |
4934 | * probably wrong function for rw==WRITE | |
4935 | */ | |
4936 | flush_dcache_page(pages[i]); | |
4937 | } | |
4938 | ||
4939 | mdata->offset = uaddr & ~PAGE_MASK; | |
4940 | STbp->mapped_pages = pages; | |
4941 | ||
4942 | return nr_pages; | |
4943 | out_unmap: | |
4944 | if (res > 0) { | |
4945 | for (j=0; j < res; j++) | |
4946 | put_page(pages[j]); | |
4947 | res = 0; | |
4948 | } | |
4949 | kfree(pages); | |
4950 | return res; | |
4951 | } | |
4952 | ||
4953 | ||
4954 | /* And unmap them... */ | |
4955 | static int sgl_unmap_user_pages(struct st_buffer *STbp, | |
4956 | const unsigned int nr_pages, int dirtied) | |
4957 | { | |
4958 | int i; | |
4959 | ||
4960 | for (i=0; i < nr_pages; i++) { | |
4961 | struct page *page = STbp->mapped_pages[i]; | |
4962 | ||
4963 | if (dirtied) | |
4964 | SetPageDirty(page); | |
4965 | /* FIXME: cache flush missing for rw==READ | |
4966 | * FIXME: call the correct reference counting function | |
4967 | */ | |
4968 | put_page(page); | |
4969 | } | |
4970 | kfree(STbp->mapped_pages); | |
4971 | STbp->mapped_pages = NULL; | |
4972 | ||
4973 | return 0; | |
4974 | } |