]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying | |
3 | file Documentation/scsi/st.txt for more information. | |
4 | ||
5 | History: | |
6 | Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara. | |
7 | Contribution and ideas from several people including (in alphabetical | |
8 | order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk, | |
9 | Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky, | |
10 | Michael Schaefer, J"org Weule, and Eric Youngdale. | |
11 | ||
12 | Copyright 1992 - 2005 Kai Makisara | |
13 | email Kai.Makisara@kolumbus.fi | |
14 | ||
15 | Some small formal changes - aeb, 950809 | |
16 | ||
17 | Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support | |
18 | */ | |
19 | ||
20 | static char *verstr = "20050312"; | |
21 | ||
22 | #include <linux/module.h> | |
23 | ||
24 | #include <linux/fs.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/sched.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/mtio.h> | |
32 | #include <linux/ioctl.h> | |
33 | #include <linux/fcntl.h> | |
34 | #include <linux/spinlock.h> | |
35 | #include <linux/blkdev.h> | |
36 | #include <linux/moduleparam.h> | |
37 | #include <linux/devfs_fs_kernel.h> | |
38 | #include <linux/cdev.h> | |
39 | #include <linux/delay.h> | |
40 | ||
41 | #include <asm/uaccess.h> | |
42 | #include <asm/dma.h> | |
43 | #include <asm/system.h> | |
44 | ||
45 | #include <scsi/scsi.h> | |
46 | #include <scsi/scsi_dbg.h> | |
47 | #include <scsi/scsi_device.h> | |
48 | #include <scsi/scsi_driver.h> | |
49 | #include <scsi/scsi_eh.h> | |
50 | #include <scsi/scsi_host.h> | |
51 | #include <scsi/scsi_ioctl.h> | |
52 | #include <scsi/scsi_request.h> | |
53 | ||
54 | ||
55 | /* The driver prints some debugging information on the console if DEBUG | |
56 | is defined and non-zero. */ | |
57 | #define DEBUG 0 | |
58 | ||
59 | #if DEBUG | |
60 | /* The message level for the debug messages is currently set to KERN_NOTICE | |
61 | so that people can easily see the messages. Later when the debugging messages | |
62 | in the drivers are more widely classified, this may be changed to KERN_DEBUG. */ | |
63 | #define ST_DEB_MSG KERN_NOTICE | |
64 | #define DEB(a) a | |
65 | #define DEBC(a) if (debugging) { a ; } | |
66 | #else | |
67 | #define DEB(a) | |
68 | #define DEBC(a) | |
69 | #endif | |
70 | ||
71 | #define ST_KILOBYTE 1024 | |
72 | ||
73 | #include "st_options.h" | |
74 | #include "st.h" | |
75 | ||
76 | static int buffer_kbs; | |
77 | static int max_sg_segs; | |
78 | static int try_direct_io = TRY_DIRECT_IO; | |
79 | static int try_rdio = 1; | |
80 | static int try_wdio = 1; | |
81 | ||
82 | static int st_dev_max; | |
83 | static int st_nr_dev; | |
84 | ||
85 | static struct class_simple *st_sysfs_class; | |
86 | ||
87 | MODULE_AUTHOR("Kai Makisara"); | |
88 | MODULE_DESCRIPTION("SCSI Tape Driver"); | |
89 | MODULE_LICENSE("GPL"); | |
90 | ||
91 | /* Set 'perm' (4th argument) to 0 to disable module_param's definition | |
92 | * of sysfs parameters (which module_param doesn't yet support). | |
93 | * Sysfs parameters defined explicitly later. | |
94 | */ | |
95 | module_param_named(buffer_kbs, buffer_kbs, int, 0); | |
96 | MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)"); | |
97 | module_param_named(max_sg_segs, max_sg_segs, int, 0); | |
98 | MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)"); | |
99 | module_param_named(try_direct_io, try_direct_io, int, 0); | |
100 | MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)"); | |
101 | ||
102 | /* Extra parameters for testing */ | |
103 | module_param_named(try_rdio, try_rdio, int, 0); | |
104 | MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); | |
105 | module_param_named(try_wdio, try_wdio, int, 0); | |
106 | MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); | |
107 | ||
108 | #ifndef MODULE | |
109 | static int write_threshold_kbs; /* retained for compatibility */ | |
110 | static struct st_dev_parm { | |
111 | char *name; | |
112 | int *val; | |
113 | } parms[] __initdata = { | |
114 | { | |
115 | "buffer_kbs", &buffer_kbs | |
116 | }, | |
117 | { /* Retained for compatibility with 2.4 */ | |
118 | "write_threshold_kbs", &write_threshold_kbs | |
119 | }, | |
120 | { | |
121 | "max_sg_segs", NULL | |
122 | }, | |
123 | { | |
124 | "try_direct_io", &try_direct_io | |
125 | } | |
126 | }; | |
127 | #endif | |
128 | ||
129 | /* Restrict the number of modes so that names for all are assigned */ | |
130 | #if ST_NBR_MODES > 16 | |
131 | #error "Maximum number of modes is 16" | |
132 | #endif | |
133 | /* Bit reversed order to get same names for same minors with all | |
134 | mode counts */ | |
135 | static char *st_formats[] = { | |
136 | "", "r", "k", "s", "l", "t", "o", "u", | |
137 | "m", "v", "p", "x", "a", "y", "q", "z"}; | |
138 | ||
139 | /* The default definitions have been moved to st_options.h */ | |
140 | ||
141 | #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) | |
142 | ||
143 | /* The buffer size should fit into the 24 bits for length in the | |
144 | 6-byte SCSI read and write commands. */ | |
145 | #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) | |
146 | #error "Buffer size should not exceed (2 << 24 - 1) bytes!" | |
147 | #endif | |
148 | ||
149 | static int debugging = DEBUG; | |
150 | ||
151 | #define MAX_RETRIES 0 | |
152 | #define MAX_WRITE_RETRIES 0 | |
153 | #define MAX_READY_RETRIES 0 | |
154 | #define NO_TAPE NOT_READY | |
155 | ||
156 | #define ST_TIMEOUT (900 * HZ) | |
157 | #define ST_LONG_TIMEOUT (14000 * HZ) | |
158 | ||
159 | /* Remove mode bits and auto-rewind bit (7) */ | |
160 | #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ | |
161 | (iminor(x) & ~(-1 << ST_MODE_SHIFT)) ) | |
162 | #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) | |
163 | ||
164 | /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ | |
165 | #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ | |
166 | (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) | |
167 | ||
168 | /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower | |
169 | 24 bits) */ | |
170 | #define SET_DENS_AND_BLK 0x10001 | |
171 | ||
172 | static DEFINE_RWLOCK(st_dev_arr_lock); | |
173 | ||
174 | static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; | |
175 | static int st_max_sg_segs = ST_MAX_SG; | |
176 | ||
177 | static struct scsi_tape **scsi_tapes = NULL; | |
178 | ||
179 | static int modes_defined; | |
180 | ||
181 | static struct st_buffer *new_tape_buffer(int, int, int); | |
182 | static int enlarge_buffer(struct st_buffer *, int, int); | |
183 | static void normalize_buffer(struct st_buffer *); | |
184 | static int append_to_buffer(const char __user *, struct st_buffer *, int); | |
185 | static int from_buffer(struct st_buffer *, char __user *, int); | |
186 | static void move_buffer_data(struct st_buffer *, int); | |
187 | static void buf_to_sg(struct st_buffer *, unsigned int); | |
188 | ||
189 | static int st_map_user_pages(struct scatterlist *, const unsigned int, | |
190 | unsigned long, size_t, int, unsigned long); | |
191 | static int sgl_map_user_pages(struct scatterlist *, const unsigned int, | |
192 | unsigned long, size_t, int); | |
193 | static int sgl_unmap_user_pages(struct scatterlist *, const unsigned int, int); | |
194 | ||
195 | static int st_probe(struct device *); | |
196 | static int st_remove(struct device *); | |
197 | static int st_init_command(struct scsi_cmnd *); | |
198 | ||
199 | static void do_create_driverfs_files(void); | |
200 | static void do_remove_driverfs_files(void); | |
201 | static void do_create_class_files(struct scsi_tape *, int, int); | |
202 | ||
203 | static struct scsi_driver st_template = { | |
204 | .owner = THIS_MODULE, | |
205 | .gendrv = { | |
206 | .name = "st", | |
207 | .probe = st_probe, | |
208 | .remove = st_remove, | |
209 | }, | |
210 | .init_command = st_init_command, | |
211 | }; | |
212 | ||
213 | static int st_compression(struct scsi_tape *, int); | |
214 | ||
215 | static int find_partition(struct scsi_tape *); | |
216 | static int switch_partition(struct scsi_tape *); | |
217 | ||
218 | static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); | |
219 | ||
220 | \f | |
221 | #include "osst_detect.h" | |
222 | #ifndef SIGS_FROM_OSST | |
223 | #define SIGS_FROM_OSST \ | |
224 | {"OnStream", "SC-", "", "osst"}, \ | |
225 | {"OnStream", "DI-", "", "osst"}, \ | |
226 | {"OnStream", "DP-", "", "osst"}, \ | |
227 | {"OnStream", "USB", "", "osst"}, \ | |
228 | {"OnStream", "FW-", "", "osst"} | |
229 | #endif | |
230 | ||
231 | struct st_reject_data { | |
232 | char *vendor; | |
233 | char *model; | |
234 | char *rev; | |
235 | char *driver_hint; /* Name of the correct driver, NULL if unknown */ | |
236 | }; | |
237 | ||
238 | static struct st_reject_data reject_list[] = { | |
239 | /* {"XXX", "Yy-", "", NULL}, example */ | |
240 | SIGS_FROM_OSST, | |
241 | {NULL, }}; | |
242 | ||
243 | /* If the device signature is on the list of incompatible drives, the | |
244 | function returns a pointer to the name of the correct driver (if known) */ | |
245 | static char * st_incompatible(struct scsi_device* SDp) | |
246 | { | |
247 | struct st_reject_data *rp; | |
248 | ||
249 | for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) | |
250 | if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && | |
251 | !strncmp(rp->model, SDp->model, strlen(rp->model)) && | |
252 | !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { | |
253 | if (rp->driver_hint) | |
254 | return rp->driver_hint; | |
255 | else | |
256 | return "unknown"; | |
257 | } | |
258 | return NULL; | |
259 | } | |
260 | \f | |
261 | ||
262 | static inline char *tape_name(struct scsi_tape *tape) | |
263 | { | |
264 | return tape->disk->disk_name; | |
265 | } | |
266 | ||
267 | ||
268 | static void st_analyze_sense(struct scsi_request *SRpnt, struct st_cmdstatus *s) | |
269 | { | |
270 | const u8 *ucp; | |
271 | const u8 *sense = SRpnt->sr_sense_buffer; | |
272 | ||
273 | s->have_sense = scsi_request_normalize_sense(SRpnt, &s->sense_hdr); | |
274 | s->flags = 0; | |
275 | ||
276 | if (s->have_sense) { | |
277 | s->deferred = 0; | |
278 | s->remainder_valid = | |
279 | scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); | |
280 | switch (sense[0] & 0x7f) { | |
281 | case 0x71: | |
282 | s->deferred = 1; | |
283 | case 0x70: | |
284 | s->fixed_format = 1; | |
285 | s->flags = sense[2] & 0xe0; | |
286 | break; | |
287 | case 0x73: | |
288 | s->deferred = 1; | |
289 | case 0x72: | |
290 | s->fixed_format = 0; | |
291 | ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); | |
292 | s->flags = ucp ? (ucp[3] & 0xe0) : 0; | |
293 | break; | |
294 | } | |
295 | } | |
296 | } | |
297 | ||
298 | ||
299 | /* Convert the result to success code */ | |
300 | static int st_chk_result(struct scsi_tape *STp, struct scsi_request * SRpnt) | |
301 | { | |
302 | int result = SRpnt->sr_result; | |
303 | u8 scode; | |
304 | DEB(const char *stp;) | |
305 | char *name = tape_name(STp); | |
306 | struct st_cmdstatus *cmdstatp; | |
307 | ||
308 | if (!result) | |
309 | return 0; | |
310 | ||
311 | cmdstatp = &STp->buffer->cmdstat; | |
312 | st_analyze_sense(STp->buffer->last_SRpnt, cmdstatp); | |
313 | ||
314 | if (cmdstatp->have_sense) | |
315 | scode = STp->buffer->cmdstat.sense_hdr.sense_key; | |
316 | else | |
317 | scode = 0; | |
318 | ||
319 | DEB( | |
320 | if (debugging) { | |
321 | printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x Len: %d\n", | |
322 | name, result, | |
323 | SRpnt->sr_cmnd[0], SRpnt->sr_cmnd[1], SRpnt->sr_cmnd[2], | |
324 | SRpnt->sr_cmnd[3], SRpnt->sr_cmnd[4], SRpnt->sr_cmnd[5], | |
325 | SRpnt->sr_bufflen); | |
326 | if (cmdstatp->have_sense) | |
327 | scsi_print_req_sense("st", SRpnt); | |
328 | } ) /* end DEB */ | |
329 | if (!debugging) { /* Abnormal conditions for tape */ | |
330 | if (!cmdstatp->have_sense) | |
331 | printk(KERN_WARNING | |
332 | "%s: Error %x (sugg. bt 0x%x, driver bt 0x%x, host bt 0x%x).\n", | |
333 | name, result, suggestion(result), | |
334 | driver_byte(result) & DRIVER_MASK, host_byte(result)); | |
335 | else if (cmdstatp->have_sense && | |
336 | scode != NO_SENSE && | |
337 | scode != RECOVERED_ERROR && | |
338 | /* scode != UNIT_ATTENTION && */ | |
339 | scode != BLANK_CHECK && | |
340 | scode != VOLUME_OVERFLOW && | |
341 | SRpnt->sr_cmnd[0] != MODE_SENSE && | |
342 | SRpnt->sr_cmnd[0] != TEST_UNIT_READY) { | |
343 | printk(KERN_WARNING "%s: Error with sense data: ", name); | |
344 | scsi_print_req_sense("st", SRpnt); | |
345 | } | |
346 | } | |
347 | ||
348 | if (cmdstatp->fixed_format && | |
349 | STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ | |
350 | if (STp->cln_sense_value) | |
351 | STp->cleaning_req |= ((SRpnt->sr_sense_buffer[STp->cln_mode] & | |
352 | STp->cln_sense_mask) == STp->cln_sense_value); | |
353 | else | |
354 | STp->cleaning_req |= ((SRpnt->sr_sense_buffer[STp->cln_mode] & | |
355 | STp->cln_sense_mask) != 0); | |
356 | } | |
357 | if (cmdstatp->have_sense && | |
358 | cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17) | |
359 | STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */ | |
360 | ||
361 | STp->pos_unknown |= STp->device->was_reset; | |
362 | ||
363 | if (cmdstatp->have_sense && | |
364 | scode == RECOVERED_ERROR | |
365 | #if ST_RECOVERED_WRITE_FATAL | |
366 | && SRpnt->sr_cmnd[0] != WRITE_6 | |
367 | && SRpnt->sr_cmnd[0] != WRITE_FILEMARKS | |
368 | #endif | |
369 | ) { | |
370 | STp->recover_count++; | |
371 | STp->recover_reg++; | |
372 | ||
373 | DEB( | |
374 | if (debugging) { | |
375 | if (SRpnt->sr_cmnd[0] == READ_6) | |
376 | stp = "read"; | |
377 | else if (SRpnt->sr_cmnd[0] == WRITE_6) | |
378 | stp = "write"; | |
379 | else | |
380 | stp = "ioctl"; | |
381 | printk(ST_DEB_MSG "%s: Recovered %s error (%d).\n", name, stp, | |
382 | STp->recover_count); | |
383 | } ) /* end DEB */ | |
384 | ||
385 | if (cmdstatp->flags == 0) | |
386 | return 0; | |
387 | } | |
388 | return (-EIO); | |
389 | } | |
390 | ||
391 | ||
392 | /* Wakeup from interrupt */ | |
393 | static void st_sleep_done(struct scsi_cmnd * SCpnt) | |
394 | { | |
395 | struct scsi_tape *STp = container_of(SCpnt->request->rq_disk->private_data, | |
396 | struct scsi_tape, driver); | |
397 | ||
398 | (STp->buffer)->cmdstat.midlevel_result = SCpnt->result; | |
399 | SCpnt->request->rq_status = RQ_SCSI_DONE; | |
400 | (STp->buffer)->last_SRpnt = SCpnt->sc_request; | |
401 | DEB( STp->write_pending = 0; ) | |
402 | ||
403 | complete(SCpnt->request->waiting); | |
404 | } | |
405 | ||
406 | /* Do the scsi command. Waits until command performed if do_wait is true. | |
407 | Otherwise write_behind_check() is used to check that the command | |
408 | has finished. */ | |
409 | static struct scsi_request * | |
410 | st_do_scsi(struct scsi_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, | |
411 | int bytes, int direction, int timeout, int retries, int do_wait) | |
412 | { | |
413 | unsigned char *bp; | |
414 | ||
415 | if (SRpnt == NULL) { | |
416 | SRpnt = scsi_allocate_request(STp->device, GFP_ATOMIC); | |
417 | if (SRpnt == NULL) { | |
418 | DEBC( printk(KERN_ERR "%s: Can't get SCSI request.\n", | |
419 | tape_name(STp)); ); | |
420 | if (signal_pending(current)) | |
421 | (STp->buffer)->syscall_result = (-EINTR); | |
422 | else | |
423 | (STp->buffer)->syscall_result = (-EBUSY); | |
424 | return NULL; | |
425 | } | |
426 | } | |
427 | ||
428 | init_completion(&STp->wait); | |
429 | SRpnt->sr_use_sg = STp->buffer->do_dio || (bytes > (STp->buffer)->frp[0].length); | |
430 | if (SRpnt->sr_use_sg) { | |
431 | if (!STp->buffer->do_dio) | |
432 | buf_to_sg(STp->buffer, bytes); | |
433 | SRpnt->sr_use_sg = (STp->buffer)->sg_segs; | |
434 | bp = (char *) &((STp->buffer)->sg[0]); | |
435 | } else | |
436 | bp = (STp->buffer)->b_data; | |
437 | SRpnt->sr_data_direction = direction; | |
438 | SRpnt->sr_cmd_len = 0; | |
439 | SRpnt->sr_request->waiting = &(STp->wait); | |
440 | SRpnt->sr_request->rq_status = RQ_SCSI_BUSY; | |
441 | SRpnt->sr_request->rq_disk = STp->disk; | |
442 | STp->buffer->cmdstat.have_sense = 0; | |
443 | ||
444 | scsi_do_req(SRpnt, (void *) cmd, bp, bytes, | |
445 | st_sleep_done, timeout, retries); | |
446 | ||
447 | if (do_wait) { | |
448 | wait_for_completion(SRpnt->sr_request->waiting); | |
449 | SRpnt->sr_request->waiting = NULL; | |
450 | (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); | |
451 | } | |
452 | return SRpnt; | |
453 | } | |
454 | ||
455 | ||
456 | /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if | |
457 | write has been correct but EOM early warning reached, -EIO if write ended in | |
458 | error or zero if write successful. Asynchronous writes are used only in | |
459 | variable block mode. */ | |
460 | static int write_behind_check(struct scsi_tape * STp) | |
461 | { | |
462 | int retval = 0; | |
463 | struct st_buffer *STbuffer; | |
464 | struct st_partstat *STps; | |
465 | struct st_cmdstatus *cmdstatp; | |
466 | ||
467 | STbuffer = STp->buffer; | |
468 | if (!STbuffer->writing) | |
469 | return 0; | |
470 | ||
471 | DEB( | |
472 | if (STp->write_pending) | |
473 | STp->nbr_waits++; | |
474 | else | |
475 | STp->nbr_finished++; | |
476 | ) /* end DEB */ | |
477 | ||
478 | wait_for_completion(&(STp->wait)); | |
479 | (STp->buffer)->last_SRpnt->sr_request->waiting = NULL; | |
480 | ||
481 | (STp->buffer)->syscall_result = st_chk_result(STp, (STp->buffer)->last_SRpnt); | |
482 | scsi_release_request((STp->buffer)->last_SRpnt); | |
483 | ||
484 | STbuffer->buffer_bytes -= STbuffer->writing; | |
485 | STps = &(STp->ps[STp->partition]); | |
486 | if (STps->drv_block >= 0) { | |
487 | if (STp->block_size == 0) | |
488 | STps->drv_block++; | |
489 | else | |
490 | STps->drv_block += STbuffer->writing / STp->block_size; | |
491 | } | |
492 | ||
493 | cmdstatp = &STbuffer->cmdstat; | |
494 | if (STbuffer->syscall_result) { | |
495 | retval = -EIO; | |
496 | if (cmdstatp->have_sense && !cmdstatp->deferred && | |
497 | (cmdstatp->flags & SENSE_EOM) && | |
498 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
499 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) { | |
500 | /* EOM at write-behind, has all data been written? */ | |
501 | if (!cmdstatp->remainder_valid || | |
502 | cmdstatp->uremainder64 == 0) | |
503 | retval = -ENOSPC; | |
504 | } | |
505 | if (retval == -EIO) | |
506 | STps->drv_block = -1; | |
507 | } | |
508 | STbuffer->writing = 0; | |
509 | ||
510 | DEB(if (debugging && retval) | |
511 | printk(ST_DEB_MSG "%s: Async write error %x, return value %d.\n", | |
512 | tape_name(STp), STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */ | |
513 | ||
514 | return retval; | |
515 | } | |
516 | ||
517 | ||
518 | /* Step over EOF if it has been inadvertently crossed (ioctl not used because | |
519 | it messes up the block number). */ | |
520 | static int cross_eof(struct scsi_tape * STp, int forward) | |
521 | { | |
522 | struct scsi_request *SRpnt; | |
523 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
524 | ||
525 | cmd[0] = SPACE; | |
526 | cmd[1] = 0x01; /* Space FileMarks */ | |
527 | if (forward) { | |
528 | cmd[2] = cmd[3] = 0; | |
529 | cmd[4] = 1; | |
530 | } else | |
531 | cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ | |
532 | cmd[5] = 0; | |
533 | ||
534 | DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n", | |
535 | tape_name(STp), forward ? "forward" : "backward")); | |
536 | ||
537 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, | |
538 | STp->device->timeout, MAX_RETRIES, 1); | |
539 | if (!SRpnt) | |
540 | return (STp->buffer)->syscall_result; | |
541 | ||
542 | scsi_release_request(SRpnt); | |
543 | SRpnt = NULL; | |
544 | ||
545 | if ((STp->buffer)->cmdstat.midlevel_result != 0) | |
546 | printk(KERN_ERR "%s: Stepping over filemark %s failed.\n", | |
547 | tape_name(STp), forward ? "forward" : "backward"); | |
548 | ||
549 | return (STp->buffer)->syscall_result; | |
550 | } | |
551 | ||
552 | ||
553 | /* Flush the write buffer (never need to write if variable blocksize). */ | |
554 | static int flush_write_buffer(struct scsi_tape * STp) | |
555 | { | |
556 | int offset, transfer, blks; | |
557 | int result; | |
558 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
559 | struct scsi_request *SRpnt; | |
560 | struct st_partstat *STps; | |
561 | ||
562 | result = write_behind_check(STp); | |
563 | if (result) | |
564 | return result; | |
565 | ||
566 | result = 0; | |
567 | if (STp->dirty == 1) { | |
568 | ||
569 | offset = (STp->buffer)->buffer_bytes; | |
570 | transfer = ((offset + STp->block_size - 1) / | |
571 | STp->block_size) * STp->block_size; | |
572 | DEBC(printk(ST_DEB_MSG "%s: Flushing %d bytes.\n", | |
573 | tape_name(STp), transfer)); | |
574 | ||
575 | memset((STp->buffer)->b_data + offset, 0, transfer - offset); | |
576 | ||
577 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
578 | cmd[0] = WRITE_6; | |
579 | cmd[1] = 1; | |
580 | blks = transfer / STp->block_size; | |
581 | cmd[2] = blks >> 16; | |
582 | cmd[3] = blks >> 8; | |
583 | cmd[4] = blks; | |
584 | ||
585 | SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE, | |
586 | STp->device->timeout, MAX_WRITE_RETRIES, 1); | |
587 | if (!SRpnt) | |
588 | return (STp->buffer)->syscall_result; | |
589 | ||
590 | STps = &(STp->ps[STp->partition]); | |
591 | if ((STp->buffer)->syscall_result != 0) { | |
592 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
593 | ||
594 | if (cmdstatp->have_sense && !cmdstatp->deferred && | |
595 | (cmdstatp->flags & SENSE_EOM) && | |
596 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
597 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && | |
598 | (!cmdstatp->remainder_valid || | |
599 | cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */ | |
600 | STp->dirty = 0; | |
601 | (STp->buffer)->buffer_bytes = 0; | |
602 | if (STps->drv_block >= 0) | |
603 | STps->drv_block += blks; | |
604 | result = (-ENOSPC); | |
605 | } else { | |
606 | printk(KERN_ERR "%s: Error on flush.\n", | |
607 | tape_name(STp)); | |
608 | STps->drv_block = (-1); | |
609 | result = (-EIO); | |
610 | } | |
611 | } else { | |
612 | if (STps->drv_block >= 0) | |
613 | STps->drv_block += blks; | |
614 | STp->dirty = 0; | |
615 | (STp->buffer)->buffer_bytes = 0; | |
616 | } | |
617 | scsi_release_request(SRpnt); | |
618 | SRpnt = NULL; | |
619 | } | |
620 | return result; | |
621 | } | |
622 | ||
623 | ||
624 | /* Flush the tape buffer. The tape will be positioned correctly unless | |
625 | seek_next is true. */ | |
626 | static int flush_buffer(struct scsi_tape *STp, int seek_next) | |
627 | { | |
628 | int backspace, result; | |
629 | struct st_buffer *STbuffer; | |
630 | struct st_partstat *STps; | |
631 | ||
632 | STbuffer = STp->buffer; | |
633 | ||
634 | /* | |
635 | * If there was a bus reset, block further access | |
636 | * to this device. | |
637 | */ | |
638 | if (STp->pos_unknown) | |
639 | return (-EIO); | |
640 | ||
641 | if (STp->ready != ST_READY) | |
642 | return 0; | |
643 | STps = &(STp->ps[STp->partition]); | |
644 | if (STps->rw == ST_WRITING) /* Writing */ | |
645 | return flush_write_buffer(STp); | |
646 | ||
647 | if (STp->block_size == 0) | |
648 | return 0; | |
649 | ||
650 | backspace = ((STp->buffer)->buffer_bytes + | |
651 | (STp->buffer)->read_pointer) / STp->block_size - | |
652 | ((STp->buffer)->read_pointer + STp->block_size - 1) / | |
653 | STp->block_size; | |
654 | (STp->buffer)->buffer_bytes = 0; | |
655 | (STp->buffer)->read_pointer = 0; | |
656 | result = 0; | |
657 | if (!seek_next) { | |
658 | if (STps->eof == ST_FM_HIT) { | |
659 | result = cross_eof(STp, 0); /* Back over the EOF hit */ | |
660 | if (!result) | |
661 | STps->eof = ST_NOEOF; | |
662 | else { | |
663 | if (STps->drv_file >= 0) | |
664 | STps->drv_file++; | |
665 | STps->drv_block = 0; | |
666 | } | |
667 | } | |
668 | if (!result && backspace > 0) | |
669 | result = st_int_ioctl(STp, MTBSR, backspace); | |
670 | } else if (STps->eof == ST_FM_HIT) { | |
671 | if (STps->drv_file >= 0) | |
672 | STps->drv_file++; | |
673 | STps->drv_block = 0; | |
674 | STps->eof = ST_NOEOF; | |
675 | } | |
676 | return result; | |
677 | ||
678 | } | |
679 | \f | |
680 | /* Set the mode parameters */ | |
681 | static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm) | |
682 | { | |
683 | int set_it = 0; | |
684 | unsigned long arg; | |
685 | char *name = tape_name(STp); | |
686 | ||
687 | if (!STp->density_changed && | |
688 | STm->default_density >= 0 && | |
689 | STm->default_density != STp->density) { | |
690 | arg = STm->default_density; | |
691 | set_it = 1; | |
692 | } else | |
693 | arg = STp->density; | |
694 | arg <<= MT_ST_DENSITY_SHIFT; | |
695 | if (!STp->blksize_changed && | |
696 | STm->default_blksize >= 0 && | |
697 | STm->default_blksize != STp->block_size) { | |
698 | arg |= STm->default_blksize; | |
699 | set_it = 1; | |
700 | } else | |
701 | arg |= STp->block_size; | |
702 | if (set_it && | |
703 | st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) { | |
704 | printk(KERN_WARNING | |
705 | "%s: Can't set default block size to %d bytes and density %x.\n", | |
706 | name, STm->default_blksize, STm->default_density); | |
707 | if (modes_defined) | |
708 | return (-EINVAL); | |
709 | } | |
710 | return 0; | |
711 | } | |
712 | ||
713 | ||
714 | /* Lock or unlock the drive door. Don't use when scsi_request allocated. */ | |
715 | static int do_door_lock(struct scsi_tape * STp, int do_lock) | |
716 | { | |
717 | int retval, cmd; | |
718 | DEB(char *name = tape_name(STp);) | |
719 | ||
720 | ||
721 | cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK; | |
722 | DEBC(printk(ST_DEB_MSG "%s: %socking drive door.\n", name, | |
723 | do_lock ? "L" : "Unl")); | |
724 | retval = scsi_ioctl(STp->device, cmd, NULL); | |
725 | if (!retval) { | |
726 | STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; | |
727 | } | |
728 | else { | |
729 | STp->door_locked = ST_LOCK_FAILS; | |
730 | } | |
731 | return retval; | |
732 | } | |
733 | ||
734 | ||
735 | /* Set the internal state after reset */ | |
736 | static void reset_state(struct scsi_tape *STp) | |
737 | { | |
738 | int i; | |
739 | struct st_partstat *STps; | |
740 | ||
741 | STp->pos_unknown = 0; | |
742 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
743 | STps = &(STp->ps[i]); | |
744 | STps->rw = ST_IDLE; | |
745 | STps->eof = ST_NOEOF; | |
746 | STps->at_sm = 0; | |
747 | STps->last_block_valid = 0; | |
748 | STps->drv_block = -1; | |
749 | STps->drv_file = -1; | |
750 | } | |
751 | if (STp->can_partitions) { | |
752 | STp->partition = find_partition(STp); | |
753 | if (STp->partition < 0) | |
754 | STp->partition = 0; | |
755 | STp->new_partition = STp->partition; | |
756 | } | |
757 | } | |
758 | \f | |
759 | /* Test if the drive is ready. Returns either one of the codes below or a negative system | |
760 | error code. */ | |
761 | #define CHKRES_READY 0 | |
762 | #define CHKRES_NEW_SESSION 1 | |
763 | #define CHKRES_NOT_READY 2 | |
764 | #define CHKRES_NO_TAPE 3 | |
765 | ||
766 | #define MAX_ATTENTIONS 10 | |
767 | ||
768 | static int test_ready(struct scsi_tape *STp, int do_wait) | |
769 | { | |
770 | int attentions, waits, max_wait, scode; | |
771 | int retval = CHKRES_READY, new_session = 0; | |
772 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
773 | struct scsi_request *SRpnt = NULL; | |
774 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
775 | ||
776 | max_wait = do_wait ? ST_BLOCK_SECONDS : 0; | |
777 | ||
778 | for (attentions=waits=0; ; ) { | |
779 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
780 | cmd[0] = TEST_UNIT_READY; | |
781 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, | |
782 | STp->long_timeout, MAX_READY_RETRIES, 1); | |
783 | ||
784 | if (!SRpnt) { | |
785 | retval = (STp->buffer)->syscall_result; | |
786 | break; | |
787 | } | |
788 | ||
789 | if (cmdstatp->have_sense) { | |
790 | ||
791 | scode = cmdstatp->sense_hdr.sense_key; | |
792 | ||
793 | if (scode == UNIT_ATTENTION) { /* New media? */ | |
794 | new_session = 1; | |
795 | if (attentions < MAX_ATTENTIONS) { | |
796 | attentions++; | |
797 | continue; | |
798 | } | |
799 | else { | |
800 | retval = (-EIO); | |
801 | break; | |
802 | } | |
803 | } | |
804 | ||
805 | if (scode == NOT_READY) { | |
806 | if (waits < max_wait) { | |
807 | if (msleep_interruptible(1000)) { | |
808 | retval = (-EINTR); | |
809 | break; | |
810 | } | |
811 | waits++; | |
812 | continue; | |
813 | } | |
814 | else { | |
815 | if ((STp->device)->scsi_level >= SCSI_2 && | |
816 | cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */ | |
817 | retval = CHKRES_NO_TAPE; | |
818 | else | |
819 | retval = CHKRES_NOT_READY; | |
820 | break; | |
821 | } | |
822 | } | |
823 | } | |
824 | ||
825 | retval = (STp->buffer)->syscall_result; | |
826 | if (!retval) | |
827 | retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY; | |
828 | break; | |
829 | } | |
830 | ||
831 | if (SRpnt != NULL) | |
832 | scsi_release_request(SRpnt); | |
833 | return retval; | |
834 | } | |
835 | ||
836 | ||
837 | /* See if the drive is ready and gather information about the tape. Return values: | |
838 | < 0 negative error code from errno.h | |
839 | 0 drive ready | |
840 | 1 drive not ready (possibly no tape) | |
841 | */ | |
842 | static int check_tape(struct scsi_tape *STp, struct file *filp) | |
843 | { | |
844 | int i, retval, new_session = 0, do_wait; | |
845 | unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning; | |
846 | unsigned short st_flags = filp->f_flags; | |
847 | struct scsi_request *SRpnt = NULL; | |
848 | struct st_modedef *STm; | |
849 | struct st_partstat *STps; | |
850 | char *name = tape_name(STp); | |
851 | struct inode *inode = filp->f_dentry->d_inode; | |
852 | int mode = TAPE_MODE(inode); | |
853 | ||
854 | STp->ready = ST_READY; | |
855 | ||
856 | if (mode != STp->current_mode) { | |
857 | DEBC(printk(ST_DEB_MSG "%s: Mode change from %d to %d.\n", | |
858 | name, STp->current_mode, mode)); | |
859 | new_session = 1; | |
860 | STp->current_mode = mode; | |
861 | } | |
862 | STm = &(STp->modes[STp->current_mode]); | |
863 | ||
864 | saved_cleaning = STp->cleaning_req; | |
865 | STp->cleaning_req = 0; | |
866 | ||
867 | do_wait = ((filp->f_flags & O_NONBLOCK) == 0); | |
868 | retval = test_ready(STp, do_wait); | |
869 | ||
870 | if (retval < 0) | |
871 | goto err_out; | |
872 | ||
873 | if (retval == CHKRES_NEW_SESSION) { | |
874 | STp->pos_unknown = 0; | |
875 | STp->partition = STp->new_partition = 0; | |
876 | if (STp->can_partitions) | |
877 | STp->nbr_partitions = 1; /* This guess will be updated later | |
878 | if necessary */ | |
879 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
880 | STps = &(STp->ps[i]); | |
881 | STps->rw = ST_IDLE; | |
882 | STps->eof = ST_NOEOF; | |
883 | STps->at_sm = 0; | |
884 | STps->last_block_valid = 0; | |
885 | STps->drv_block = 0; | |
886 | STps->drv_file = 0; | |
887 | } | |
888 | new_session = 1; | |
889 | } | |
890 | else { | |
891 | STp->cleaning_req |= saved_cleaning; | |
892 | ||
893 | if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) { | |
894 | if (retval == CHKRES_NO_TAPE) | |
895 | STp->ready = ST_NO_TAPE; | |
896 | else | |
897 | STp->ready = ST_NOT_READY; | |
898 | ||
899 | STp->density = 0; /* Clear the erroneous "residue" */ | |
900 | STp->write_prot = 0; | |
901 | STp->block_size = 0; | |
902 | STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); | |
903 | STp->partition = STp->new_partition = 0; | |
904 | STp->door_locked = ST_UNLOCKED; | |
905 | return CHKRES_NOT_READY; | |
906 | } | |
907 | } | |
908 | ||
909 | if (STp->omit_blklims) | |
910 | STp->min_block = STp->max_block = (-1); | |
911 | else { | |
912 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
913 | cmd[0] = READ_BLOCK_LIMITS; | |
914 | ||
915 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, | |
916 | STp->device->timeout, MAX_READY_RETRIES, 1); | |
917 | if (!SRpnt) { | |
918 | retval = (STp->buffer)->syscall_result; | |
919 | goto err_out; | |
920 | } | |
921 | ||
922 | if (!SRpnt->sr_result && !STp->buffer->cmdstat.have_sense) { | |
923 | STp->max_block = ((STp->buffer)->b_data[1] << 16) | | |
924 | ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; | |
925 | STp->min_block = ((STp->buffer)->b_data[4] << 8) | | |
926 | (STp->buffer)->b_data[5]; | |
927 | if ( DEB( debugging || ) !STp->inited) | |
928 | printk(KERN_WARNING | |
929 | "%s: Block limits %d - %d bytes.\n", name, | |
930 | STp->min_block, STp->max_block); | |
931 | } else { | |
932 | STp->min_block = STp->max_block = (-1); | |
933 | DEBC(printk(ST_DEB_MSG "%s: Can't read block limits.\n", | |
934 | name)); | |
935 | } | |
936 | } | |
937 | ||
938 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
939 | cmd[0] = MODE_SENSE; | |
940 | cmd[4] = 12; | |
941 | ||
942 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, | |
943 | STp->device->timeout, MAX_READY_RETRIES, 1); | |
944 | if (!SRpnt) { | |
945 | retval = (STp->buffer)->syscall_result; | |
946 | goto err_out; | |
947 | } | |
948 | ||
949 | if ((STp->buffer)->syscall_result != 0) { | |
950 | DEBC(printk(ST_DEB_MSG "%s: No Mode Sense.\n", name)); | |
951 | STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ | |
952 | (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ | |
953 | STp->drv_write_prot = 0; | |
954 | } else { | |
955 | DEBC(printk(ST_DEB_MSG | |
956 | "%s: Mode sense. Length %d, medium %x, WBS %x, BLL %d\n", | |
957 | name, | |
958 | (STp->buffer)->b_data[0], (STp->buffer)->b_data[1], | |
959 | (STp->buffer)->b_data[2], (STp->buffer)->b_data[3])); | |
960 | ||
961 | if ((STp->buffer)->b_data[3] >= 8) { | |
962 | STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; | |
963 | STp->density = (STp->buffer)->b_data[4]; | |
964 | STp->block_size = (STp->buffer)->b_data[9] * 65536 + | |
965 | (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; | |
966 | DEBC(printk(ST_DEB_MSG | |
967 | "%s: Density %x, tape length: %x, drv buffer: %d\n", | |
968 | name, STp->density, (STp->buffer)->b_data[5] * 65536 + | |
969 | (STp->buffer)->b_data[6] * 256 + (STp->buffer)->b_data[7], | |
970 | STp->drv_buffer)); | |
971 | } | |
972 | STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; | |
973 | } | |
974 | scsi_release_request(SRpnt); | |
975 | SRpnt = NULL; | |
976 | STp->inited = 1; | |
977 | ||
978 | if (STp->block_size > 0) | |
979 | (STp->buffer)->buffer_blocks = | |
980 | (STp->buffer)->buffer_size / STp->block_size; | |
981 | else | |
982 | (STp->buffer)->buffer_blocks = 1; | |
983 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; | |
984 | ||
985 | DEBC(printk(ST_DEB_MSG | |
986 | "%s: Block size: %d, buffer size: %d (%d blocks).\n", name, | |
987 | STp->block_size, (STp->buffer)->buffer_size, | |
988 | (STp->buffer)->buffer_blocks)); | |
989 | ||
990 | if (STp->drv_write_prot) { | |
991 | STp->write_prot = 1; | |
992 | ||
993 | DEBC(printk(ST_DEB_MSG "%s: Write protected\n", name)); | |
994 | ||
995 | if (do_wait && | |
996 | ((st_flags & O_ACCMODE) == O_WRONLY || | |
997 | (st_flags & O_ACCMODE) == O_RDWR)) { | |
998 | retval = (-EROFS); | |
999 | goto err_out; | |
1000 | } | |
1001 | } | |
1002 | ||
1003 | if (STp->can_partitions && STp->nbr_partitions < 1) { | |
1004 | /* This code is reached when the device is opened for the first time | |
1005 | after the driver has been initialized with tape in the drive and the | |
1006 | partition support has been enabled. */ | |
1007 | DEBC(printk(ST_DEB_MSG | |
1008 | "%s: Updating partition number in status.\n", name)); | |
1009 | if ((STp->partition = find_partition(STp)) < 0) { | |
1010 | retval = STp->partition; | |
1011 | goto err_out; | |
1012 | } | |
1013 | STp->new_partition = STp->partition; | |
1014 | STp->nbr_partitions = 1; /* This guess will be updated when necessary */ | |
1015 | } | |
1016 | ||
1017 | if (new_session) { /* Change the drive parameters for the new mode */ | |
1018 | STp->density_changed = STp->blksize_changed = 0; | |
1019 | STp->compression_changed = 0; | |
1020 | if (!(STm->defaults_for_writes) && | |
1021 | (retval = set_mode_densblk(STp, STm)) < 0) | |
1022 | goto err_out; | |
1023 | ||
1024 | if (STp->default_drvbuffer != 0xff) { | |
1025 | if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer)) | |
1026 | printk(KERN_WARNING | |
1027 | "%s: Can't set default drive buffering to %d.\n", | |
1028 | name, STp->default_drvbuffer); | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | return CHKRES_READY; | |
1033 | ||
1034 | err_out: | |
1035 | return retval; | |
1036 | } | |
1037 | ||
1038 | ||
1039 | \f/* Open the device. Needs to be called with BKL only because of incrementing the SCSI host | |
1040 | module count. */ | |
1041 | static int st_open(struct inode *inode, struct file *filp) | |
1042 | { | |
1043 | int i, retval = (-EIO); | |
1044 | struct scsi_tape *STp; | |
1045 | struct st_partstat *STps; | |
1046 | int dev = TAPE_NR(inode); | |
1047 | char *name; | |
1048 | ||
1049 | /* | |
1050 | * We really want to do nonseekable_open(inode, filp); here, but some | |
1051 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
1052 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
1053 | */ | |
1054 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
1055 | ||
1056 | write_lock(&st_dev_arr_lock); | |
1057 | if (dev >= st_dev_max || scsi_tapes == NULL || | |
1058 | ((STp = scsi_tapes[dev]) == NULL)) { | |
1059 | write_unlock(&st_dev_arr_lock); | |
1060 | return (-ENXIO); | |
1061 | } | |
1062 | filp->private_data = STp; | |
1063 | name = tape_name(STp); | |
1064 | ||
1065 | if (STp->in_use) { | |
1066 | write_unlock(&st_dev_arr_lock); | |
1067 | DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); ) | |
1068 | return (-EBUSY); | |
1069 | } | |
1070 | ||
1071 | if(scsi_device_get(STp->device)) { | |
1072 | write_unlock(&st_dev_arr_lock); | |
1073 | return (-ENXIO); | |
1074 | } | |
1075 | STp->in_use = 1; | |
1076 | write_unlock(&st_dev_arr_lock); | |
1077 | STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; | |
1078 | ||
1079 | if (!scsi_block_when_processing_errors(STp->device)) { | |
1080 | retval = (-ENXIO); | |
1081 | goto err_out; | |
1082 | } | |
1083 | ||
1084 | /* See that we have at least a one page buffer available */ | |
1085 | if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) { | |
1086 | printk(KERN_WARNING "%s: Can't allocate one page tape buffer.\n", | |
1087 | name); | |
1088 | retval = (-EOVERFLOW); | |
1089 | goto err_out; | |
1090 | } | |
1091 | ||
1092 | (STp->buffer)->writing = 0; | |
1093 | (STp->buffer)->syscall_result = 0; | |
1094 | ||
1095 | STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY); | |
1096 | ||
1097 | STp->dirty = 0; | |
1098 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
1099 | STps = &(STp->ps[i]); | |
1100 | STps->rw = ST_IDLE; | |
1101 | } | |
1102 | STp->recover_count = 0; | |
1103 | DEB( STp->nbr_waits = STp->nbr_finished = 0; | |
1104 | STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = STp->nbr_combinable = 0; ) | |
1105 | ||
1106 | retval = check_tape(STp, filp); | |
1107 | if (retval < 0) | |
1108 | goto err_out; | |
1109 | if ((filp->f_flags & O_NONBLOCK) == 0 && | |
1110 | retval != CHKRES_READY) { | |
1111 | retval = (-EIO); | |
1112 | goto err_out; | |
1113 | } | |
1114 | return 0; | |
1115 | ||
1116 | err_out: | |
1117 | normalize_buffer(STp->buffer); | |
1118 | STp->in_use = 0; | |
1119 | scsi_device_put(STp->device); | |
1120 | return retval; | |
1121 | ||
1122 | } | |
1123 | \f | |
1124 | ||
1125 | /* Flush the tape buffer before close */ | |
1126 | static int st_flush(struct file *filp) | |
1127 | { | |
1128 | int result = 0, result2; | |
1129 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
1130 | struct scsi_request *SRpnt; | |
1131 | struct scsi_tape *STp = filp->private_data; | |
1132 | struct st_modedef *STm = &(STp->modes[STp->current_mode]); | |
1133 | struct st_partstat *STps = &(STp->ps[STp->partition]); | |
1134 | char *name = tape_name(STp); | |
1135 | ||
1136 | if (file_count(filp) > 1) | |
1137 | return 0; | |
1138 | ||
1139 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { | |
1140 | result = flush_write_buffer(STp); | |
1141 | if (result != 0 && result != (-ENOSPC)) | |
1142 | goto out; | |
1143 | } | |
1144 | ||
1145 | if (STp->can_partitions && | |
1146 | (result2 = switch_partition(STp)) < 0) { | |
1147 | DEBC(printk(ST_DEB_MSG | |
1148 | "%s: switch_partition at close failed.\n", name)); | |
1149 | if (result == 0) | |
1150 | result = result2; | |
1151 | goto out; | |
1152 | } | |
1153 | ||
1154 | DEBC( if (STp->nbr_requests) | |
1155 | printk(KERN_WARNING "%s: Number of r/w requests %d, dio used in %d, pages %d (%d).\n", | |
1156 | name, STp->nbr_requests, STp->nbr_dio, STp->nbr_pages, STp->nbr_combinable)); | |
1157 | ||
1158 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { | |
1159 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1160 | ||
1161 | DEBC(printk(ST_DEB_MSG "%s: Async write waits %d, finished %d.\n", | |
1162 | name, STp->nbr_waits, STp->nbr_finished); | |
1163 | ) | |
1164 | ||
1165 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1166 | cmd[0] = WRITE_FILEMARKS; | |
1167 | cmd[4] = 1 + STp->two_fm; | |
1168 | ||
1169 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, | |
1170 | STp->device->timeout, MAX_WRITE_RETRIES, 1); | |
1171 | if (!SRpnt) { | |
1172 | result = (STp->buffer)->syscall_result; | |
1173 | goto out; | |
1174 | } | |
1175 | ||
1176 | if (STp->buffer->syscall_result == 0 || | |
1177 | (cmdstatp->have_sense && !cmdstatp->deferred && | |
1178 | (cmdstatp->flags & SENSE_EOM) && | |
1179 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
1180 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && | |
1181 | (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) { | |
1182 | /* Write successful at EOM */ | |
1183 | scsi_release_request(SRpnt); | |
1184 | SRpnt = NULL; | |
1185 | if (STps->drv_file >= 0) | |
1186 | STps->drv_file++; | |
1187 | STps->drv_block = 0; | |
1188 | if (STp->two_fm) | |
1189 | cross_eof(STp, 0); | |
1190 | STps->eof = ST_FM; | |
1191 | } | |
1192 | else { /* Write error */ | |
1193 | scsi_release_request(SRpnt); | |
1194 | SRpnt = NULL; | |
1195 | printk(KERN_ERR "%s: Error on write filemark.\n", name); | |
1196 | if (result == 0) | |
1197 | result = (-EIO); | |
1198 | } | |
1199 | ||
1200 | DEBC(printk(ST_DEB_MSG "%s: Buffer flushed, %d EOF(s) written\n", | |
1201 | name, cmd[4])); | |
1202 | } else if (!STp->rew_at_close) { | |
1203 | STps = &(STp->ps[STp->partition]); | |
1204 | if (!STm->sysv || STps->rw != ST_READING) { | |
1205 | if (STp->can_bsr) | |
1206 | result = flush_buffer(STp, 0); | |
1207 | else if (STps->eof == ST_FM_HIT) { | |
1208 | result = cross_eof(STp, 0); | |
1209 | if (result) { | |
1210 | if (STps->drv_file >= 0) | |
1211 | STps->drv_file++; | |
1212 | STps->drv_block = 0; | |
1213 | STps->eof = ST_FM; | |
1214 | } else | |
1215 | STps->eof = ST_NOEOF; | |
1216 | } | |
1217 | } else if ((STps->eof == ST_NOEOF && | |
1218 | !(result = cross_eof(STp, 1))) || | |
1219 | STps->eof == ST_FM_HIT) { | |
1220 | if (STps->drv_file >= 0) | |
1221 | STps->drv_file++; | |
1222 | STps->drv_block = 0; | |
1223 | STps->eof = ST_FM; | |
1224 | } | |
1225 | } | |
1226 | ||
1227 | out: | |
1228 | if (STp->rew_at_close) { | |
1229 | result2 = st_int_ioctl(STp, MTREW, 1); | |
1230 | if (result == 0) | |
1231 | result = result2; | |
1232 | } | |
1233 | return result; | |
1234 | } | |
1235 | ||
1236 | ||
1237 | /* Close the device and release it. BKL is not needed: this is the only thread | |
1238 | accessing this tape. */ | |
1239 | static int st_release(struct inode *inode, struct file *filp) | |
1240 | { | |
1241 | int result = 0; | |
1242 | struct scsi_tape *STp = filp->private_data; | |
1243 | ||
1244 | if (STp->door_locked == ST_LOCKED_AUTO) | |
1245 | do_door_lock(STp, 0); | |
1246 | ||
1247 | normalize_buffer(STp->buffer); | |
1248 | write_lock(&st_dev_arr_lock); | |
1249 | STp->in_use = 0; | |
1250 | write_unlock(&st_dev_arr_lock); | |
1251 | scsi_device_put(STp->device); | |
1252 | ||
1253 | return result; | |
1254 | } | |
1255 | \f | |
1256 | /* The checks common to both reading and writing */ | |
1257 | static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count) | |
1258 | { | |
1259 | ssize_t retval = 0; | |
1260 | ||
1261 | /* | |
1262 | * If we are in the middle of error recovery, don't let anyone | |
1263 | * else try and use this device. Also, if error recovery fails, it | |
1264 | * may try and take the device offline, in which case all further | |
1265 | * access to the device is prohibited. | |
1266 | */ | |
1267 | if (!scsi_block_when_processing_errors(STp->device)) { | |
1268 | retval = (-ENXIO); | |
1269 | goto out; | |
1270 | } | |
1271 | ||
1272 | if (STp->ready != ST_READY) { | |
1273 | if (STp->ready == ST_NO_TAPE) | |
1274 | retval = (-ENOMEDIUM); | |
1275 | else | |
1276 | retval = (-EIO); | |
1277 | goto out; | |
1278 | } | |
1279 | ||
1280 | if (! STp->modes[STp->current_mode].defined) { | |
1281 | retval = (-ENXIO); | |
1282 | goto out; | |
1283 | } | |
1284 | ||
1285 | ||
1286 | /* | |
1287 | * If there was a bus reset, block further access | |
1288 | * to this device. | |
1289 | */ | |
1290 | if (STp->pos_unknown) { | |
1291 | retval = (-EIO); | |
1292 | goto out; | |
1293 | } | |
1294 | ||
1295 | if (count == 0) | |
1296 | goto out; | |
1297 | ||
1298 | DEB( | |
1299 | if (!STp->in_use) { | |
1300 | printk(ST_DEB_MSG "%s: Incorrect device.\n", tape_name(STp)); | |
1301 | retval = (-EIO); | |
1302 | goto out; | |
1303 | } ) /* end DEB */ | |
1304 | ||
1305 | if (STp->can_partitions && | |
1306 | (retval = switch_partition(STp)) < 0) | |
1307 | goto out; | |
1308 | ||
1309 | if (STp->block_size == 0 && STp->max_block > 0 && | |
1310 | (count < STp->min_block || count > STp->max_block)) { | |
1311 | retval = (-EINVAL); | |
1312 | goto out; | |
1313 | } | |
1314 | ||
1315 | if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && | |
1316 | !do_door_lock(STp, 1)) | |
1317 | STp->door_locked = ST_LOCKED_AUTO; | |
1318 | ||
1319 | out: | |
1320 | return retval; | |
1321 | } | |
1322 | ||
1323 | ||
1324 | static int setup_buffering(struct scsi_tape *STp, const char __user *buf, | |
1325 | size_t count, int is_read) | |
1326 | { | |
1327 | int i, bufsize, retval = 0; | |
1328 | struct st_buffer *STbp = STp->buffer; | |
1329 | ||
1330 | if (is_read) | |
1331 | i = STp->try_dio && try_rdio; | |
1332 | else | |
1333 | i = STp->try_dio && try_wdio; | |
1334 | if (i && ((unsigned long)buf & queue_dma_alignment( | |
1335 | STp->device->request_queue)) == 0) { | |
1336 | i = st_map_user_pages(&(STbp->sg[0]), STbp->use_sg, | |
1337 | (unsigned long)buf, count, (is_read ? READ : WRITE), | |
1338 | STp->max_pfn); | |
1339 | if (i > 0) { | |
1340 | STbp->do_dio = i; | |
1341 | STbp->buffer_bytes = 0; /* can be used as transfer counter */ | |
1342 | } | |
1343 | else | |
1344 | STbp->do_dio = 0; /* fall back to buffering with any error */ | |
1345 | STbp->sg_segs = STbp->do_dio; | |
1346 | STbp->frp_sg_current = 0; | |
1347 | DEB( | |
1348 | if (STbp->do_dio) { | |
1349 | STp->nbr_dio++; | |
1350 | STp->nbr_pages += STbp->do_dio; | |
1351 | for (i=1; i < STbp->do_dio; i++) | |
1352 | if (page_to_pfn(STbp->sg[i].page) == page_to_pfn(STbp->sg[i-1].page) + 1) | |
1353 | STp->nbr_combinable++; | |
1354 | } | |
1355 | ) | |
1356 | } else | |
1357 | STbp->do_dio = 0; | |
1358 | DEB( STp->nbr_requests++; ) | |
1359 | ||
1360 | if (!STbp->do_dio) { | |
1361 | if (STp->block_size) | |
1362 | bufsize = STp->block_size > st_fixed_buffer_size ? | |
1363 | STp->block_size : st_fixed_buffer_size; | |
1364 | else | |
1365 | bufsize = count; | |
1366 | if (bufsize > STbp->buffer_size && | |
1367 | !enlarge_buffer(STbp, bufsize, STp->restr_dma)) { | |
1368 | printk(KERN_WARNING "%s: Can't allocate %d byte tape buffer.\n", | |
1369 | tape_name(STp), bufsize); | |
1370 | retval = (-EOVERFLOW); | |
1371 | goto out; | |
1372 | } | |
1373 | if (STp->block_size) | |
1374 | STbp->buffer_blocks = bufsize / STp->block_size; | |
1375 | } | |
1376 | ||
1377 | out: | |
1378 | return retval; | |
1379 | } | |
1380 | ||
1381 | ||
1382 | /* Can be called more than once after each setup_buffer() */ | |
1383 | static void release_buffering(struct scsi_tape *STp) | |
1384 | { | |
1385 | struct st_buffer *STbp; | |
1386 | ||
1387 | STbp = STp->buffer; | |
1388 | if (STbp->do_dio) { | |
1389 | sgl_unmap_user_pages(&(STbp->sg[0]), STbp->do_dio, 0); | |
1390 | STbp->do_dio = 0; | |
1391 | } | |
1392 | } | |
1393 | ||
1394 | ||
1395 | /* Write command */ | |
1396 | static ssize_t | |
1397 | st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
1398 | { | |
1399 | ssize_t total; | |
1400 | ssize_t i, do_count, blks, transfer; | |
1401 | ssize_t retval; | |
1402 | int undone, retry_eot = 0, scode; | |
1403 | int async_write; | |
1404 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
1405 | const char __user *b_point; | |
1406 | struct scsi_request *SRpnt = NULL; | |
1407 | struct scsi_tape *STp = filp->private_data; | |
1408 | struct st_modedef *STm; | |
1409 | struct st_partstat *STps; | |
1410 | struct st_buffer *STbp; | |
1411 | char *name = tape_name(STp); | |
1412 | ||
1413 | if (down_interruptible(&STp->lock)) | |
1414 | return -ERESTARTSYS; | |
1415 | ||
1416 | retval = rw_checks(STp, filp, count); | |
1417 | if (retval || count == 0) | |
1418 | goto out; | |
1419 | ||
1420 | /* Write must be integral number of blocks */ | |
1421 | if (STp->block_size != 0 && (count % STp->block_size) != 0) { | |
1422 | printk(KERN_WARNING "%s: Write not multiple of tape block size.\n", | |
1423 | name); | |
1424 | retval = (-EINVAL); | |
1425 | goto out; | |
1426 | } | |
1427 | ||
1428 | STm = &(STp->modes[STp->current_mode]); | |
1429 | STps = &(STp->ps[STp->partition]); | |
1430 | ||
1431 | if (STp->write_prot) { | |
1432 | retval = (-EACCES); | |
1433 | goto out; | |
1434 | } | |
1435 | ||
1436 | ||
1437 | if (STps->rw == ST_READING) { | |
1438 | retval = flush_buffer(STp, 0); | |
1439 | if (retval) | |
1440 | goto out; | |
1441 | STps->rw = ST_WRITING; | |
1442 | } else if (STps->rw != ST_WRITING && | |
1443 | STps->drv_file == 0 && STps->drv_block == 0) { | |
1444 | if ((retval = set_mode_densblk(STp, STm)) < 0) | |
1445 | goto out; | |
1446 | if (STm->default_compression != ST_DONT_TOUCH && | |
1447 | !(STp->compression_changed)) { | |
1448 | if (st_compression(STp, (STm->default_compression == ST_YES))) { | |
1449 | printk(KERN_WARNING "%s: Can't set default compression.\n", | |
1450 | name); | |
1451 | if (modes_defined) { | |
1452 | retval = (-EINVAL); | |
1453 | goto out; | |
1454 | } | |
1455 | } | |
1456 | } | |
1457 | } | |
1458 | ||
1459 | STbp = STp->buffer; | |
1460 | i = write_behind_check(STp); | |
1461 | if (i) { | |
1462 | if (i == -ENOSPC) | |
1463 | STps->eof = ST_EOM_OK; | |
1464 | else | |
1465 | STps->eof = ST_EOM_ERROR; | |
1466 | } | |
1467 | ||
1468 | if (STps->eof == ST_EOM_OK) { | |
1469 | STps->eof = ST_EOD_1; /* allow next write */ | |
1470 | retval = (-ENOSPC); | |
1471 | goto out; | |
1472 | } | |
1473 | else if (STps->eof == ST_EOM_ERROR) { | |
1474 | retval = (-EIO); | |
1475 | goto out; | |
1476 | } | |
1477 | ||
1478 | /* Check the buffer readability in cases where copy_user might catch | |
1479 | the problems after some tape movement. */ | |
1480 | if (STp->block_size != 0 && | |
1481 | !STbp->do_dio && | |
1482 | (copy_from_user(&i, buf, 1) != 0 || | |
1483 | copy_from_user(&i, buf + count - 1, 1) != 0)) { | |
1484 | retval = (-EFAULT); | |
1485 | goto out; | |
1486 | } | |
1487 | ||
1488 | retval = setup_buffering(STp, buf, count, 0); | |
1489 | if (retval) | |
1490 | goto out; | |
1491 | ||
1492 | total = count; | |
1493 | ||
1494 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1495 | cmd[0] = WRITE_6; | |
1496 | cmd[1] = (STp->block_size != 0); | |
1497 | ||
1498 | STps->rw = ST_WRITING; | |
1499 | ||
1500 | b_point = buf; | |
1501 | while (count > 0 && !retry_eot) { | |
1502 | ||
1503 | if (STbp->do_dio) { | |
1504 | do_count = count; | |
1505 | } | |
1506 | else { | |
1507 | if (STp->block_size == 0) | |
1508 | do_count = count; | |
1509 | else { | |
1510 | do_count = STbp->buffer_blocks * STp->block_size - | |
1511 | STbp->buffer_bytes; | |
1512 | if (do_count > count) | |
1513 | do_count = count; | |
1514 | } | |
1515 | ||
1516 | i = append_to_buffer(b_point, STbp, do_count); | |
1517 | if (i) { | |
1518 | retval = i; | |
1519 | goto out; | |
1520 | } | |
1521 | } | |
1522 | count -= do_count; | |
1523 | b_point += do_count; | |
1524 | ||
1525 | async_write = STp->block_size == 0 && !STbp->do_dio && | |
1526 | STm->do_async_writes && STps->eof < ST_EOM_OK; | |
1527 | ||
1528 | if (STp->block_size != 0 && STm->do_buffer_writes && | |
1529 | !(STp->try_dio && try_wdio) && STps->eof < ST_EOM_OK && | |
1530 | STbp->buffer_bytes < STbp->buffer_size) { | |
1531 | STp->dirty = 1; | |
1532 | /* Don't write a buffer that is not full enough. */ | |
1533 | if (!async_write && count == 0) | |
1534 | break; | |
1535 | } | |
1536 | ||
1537 | retry_write: | |
1538 | if (STp->block_size == 0) | |
1539 | blks = transfer = do_count; | |
1540 | else { | |
1541 | if (!STbp->do_dio) | |
1542 | blks = STbp->buffer_bytes; | |
1543 | else | |
1544 | blks = do_count; | |
1545 | blks /= STp->block_size; | |
1546 | transfer = blks * STp->block_size; | |
1547 | } | |
1548 | cmd[2] = blks >> 16; | |
1549 | cmd[3] = blks >> 8; | |
1550 | cmd[4] = blks; | |
1551 | ||
1552 | SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE, | |
1553 | STp->device->timeout, MAX_WRITE_RETRIES, !async_write); | |
1554 | if (!SRpnt) { | |
1555 | retval = STbp->syscall_result; | |
1556 | goto out; | |
1557 | } | |
1558 | if (async_write) { | |
1559 | STbp->writing = transfer; | |
1560 | STp->dirty = !(STbp->writing == | |
1561 | STbp->buffer_bytes); | |
1562 | SRpnt = NULL; /* Prevent releasing this request! */ | |
1563 | DEB( STp->write_pending = 1; ) | |
1564 | break; | |
1565 | } | |
1566 | ||
1567 | if (STbp->syscall_result != 0) { | |
1568 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1569 | ||
1570 | DEBC(printk(ST_DEB_MSG "%s: Error on write:\n", name)); | |
1571 | if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) { | |
1572 | scode = cmdstatp->sense_hdr.sense_key; | |
1573 | if (cmdstatp->remainder_valid) | |
1574 | undone = (int)cmdstatp->uremainder64; | |
1575 | else if (STp->block_size == 0 && | |
1576 | scode == VOLUME_OVERFLOW) | |
1577 | undone = transfer; | |
1578 | else | |
1579 | undone = 0; | |
1580 | if (STp->block_size != 0) | |
1581 | undone *= STp->block_size; | |
1582 | if (undone <= do_count) { | |
1583 | /* Only data from this write is not written */ | |
1584 | count += undone; | |
1585 | do_count -= undone; | |
1586 | if (STp->block_size) | |
1587 | blks = (transfer - undone) / STp->block_size; | |
1588 | STps->eof = ST_EOM_OK; | |
1589 | /* Continue in fixed block mode if all written | |
1590 | in this request but still something left to write | |
1591 | (retval left to zero) | |
1592 | */ | |
1593 | if (STp->block_size == 0 || | |
1594 | undone > 0 || count == 0) | |
1595 | retval = (-ENOSPC); /* EOM within current request */ | |
1596 | DEBC(printk(ST_DEB_MSG | |
1597 | "%s: EOM with %d bytes unwritten.\n", | |
1598 | name, (int)count)); | |
1599 | } else { | |
1600 | /* EOT within data buffered earlier (possible only | |
1601 | in fixed block mode without direct i/o) */ | |
1602 | if (!retry_eot && !cmdstatp->deferred && | |
1603 | (scode == NO_SENSE || scode == RECOVERED_ERROR)) { | |
1604 | move_buffer_data(STp->buffer, transfer - undone); | |
1605 | retry_eot = 1; | |
1606 | if (STps->drv_block >= 0) { | |
1607 | STps->drv_block += (transfer - undone) / | |
1608 | STp->block_size; | |
1609 | } | |
1610 | STps->eof = ST_EOM_OK; | |
1611 | DEBC(printk(ST_DEB_MSG | |
1612 | "%s: Retry write of %d bytes at EOM.\n", | |
1613 | name, STp->buffer->buffer_bytes)); | |
1614 | goto retry_write; | |
1615 | } | |
1616 | else { | |
1617 | /* Either error within data buffered by driver or | |
1618 | failed retry */ | |
1619 | count -= do_count; | |
1620 | blks = do_count = 0; | |
1621 | STps->eof = ST_EOM_ERROR; | |
1622 | STps->drv_block = (-1); /* Too cautious? */ | |
1623 | retval = (-EIO); /* EOM for old data */ | |
1624 | DEBC(printk(ST_DEB_MSG | |
1625 | "%s: EOM with lost data.\n", | |
1626 | name)); | |
1627 | } | |
1628 | } | |
1629 | } else { | |
1630 | count += do_count; | |
1631 | STps->drv_block = (-1); /* Too cautious? */ | |
1632 | retval = (-EIO); | |
1633 | } | |
1634 | ||
1635 | } | |
1636 | ||
1637 | if (STps->drv_block >= 0) { | |
1638 | if (STp->block_size == 0) | |
1639 | STps->drv_block += (do_count > 0); | |
1640 | else | |
1641 | STps->drv_block += blks; | |
1642 | } | |
1643 | ||
1644 | STbp->buffer_bytes = 0; | |
1645 | STp->dirty = 0; | |
1646 | ||
1647 | if (retval || retry_eot) { | |
1648 | if (count < total) | |
1649 | retval = total - count; | |
1650 | goto out; | |
1651 | } | |
1652 | } | |
1653 | ||
1654 | if (STps->eof == ST_EOD_1) | |
1655 | STps->eof = ST_EOM_OK; | |
1656 | else if (STps->eof != ST_EOM_OK) | |
1657 | STps->eof = ST_NOEOF; | |
1658 | retval = total - count; | |
1659 | ||
1660 | out: | |
1661 | if (SRpnt != NULL) | |
1662 | scsi_release_request(SRpnt); | |
1663 | release_buffering(STp); | |
1664 | up(&STp->lock); | |
1665 | ||
1666 | return retval; | |
1667 | } | |
1668 | \f | |
1669 | /* Read data from the tape. Returns zero in the normal case, one if the | |
1670 | eof status has changed, and the negative error code in case of a | |
1671 | fatal error. Otherwise updates the buffer and the eof state. | |
1672 | ||
1673 | Does release user buffer mapping if it is set. | |
1674 | */ | |
1675 | static long read_tape(struct scsi_tape *STp, long count, | |
1676 | struct scsi_request ** aSRpnt) | |
1677 | { | |
1678 | int transfer, blks, bytes; | |
1679 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
1680 | struct scsi_request *SRpnt; | |
1681 | struct st_modedef *STm; | |
1682 | struct st_partstat *STps; | |
1683 | struct st_buffer *STbp; | |
1684 | int retval = 0; | |
1685 | char *name = tape_name(STp); | |
1686 | ||
1687 | if (count == 0) | |
1688 | return 0; | |
1689 | ||
1690 | STm = &(STp->modes[STp->current_mode]); | |
1691 | STps = &(STp->ps[STp->partition]); | |
1692 | if (STps->eof == ST_FM_HIT) | |
1693 | return 1; | |
1694 | STbp = STp->buffer; | |
1695 | ||
1696 | if (STp->block_size == 0) | |
1697 | blks = bytes = count; | |
1698 | else { | |
1699 | if (!(STp->try_dio && try_rdio) && STm->do_read_ahead) { | |
1700 | blks = (STp->buffer)->buffer_blocks; | |
1701 | bytes = blks * STp->block_size; | |
1702 | } else { | |
1703 | bytes = count; | |
1704 | if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size) | |
1705 | bytes = (STp->buffer)->buffer_size; | |
1706 | blks = bytes / STp->block_size; | |
1707 | bytes = blks * STp->block_size; | |
1708 | } | |
1709 | } | |
1710 | ||
1711 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1712 | cmd[0] = READ_6; | |
1713 | cmd[1] = (STp->block_size != 0); | |
1714 | cmd[2] = blks >> 16; | |
1715 | cmd[3] = blks >> 8; | |
1716 | cmd[4] = blks; | |
1717 | ||
1718 | SRpnt = *aSRpnt; | |
1719 | SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE, | |
1720 | STp->device->timeout, MAX_RETRIES, 1); | |
1721 | release_buffering(STp); | |
1722 | *aSRpnt = SRpnt; | |
1723 | if (!SRpnt) | |
1724 | return STbp->syscall_result; | |
1725 | ||
1726 | STbp->read_pointer = 0; | |
1727 | STps->at_sm = 0; | |
1728 | ||
1729 | /* Something to check */ | |
1730 | if (STbp->syscall_result) { | |
1731 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1732 | ||
1733 | retval = 1; | |
1734 | DEBC(printk(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", | |
1735 | name, | |
1736 | SRpnt->sr_sense_buffer[0], SRpnt->sr_sense_buffer[1], | |
1737 | SRpnt->sr_sense_buffer[2], SRpnt->sr_sense_buffer[3], | |
1738 | SRpnt->sr_sense_buffer[4], SRpnt->sr_sense_buffer[5], | |
1739 | SRpnt->sr_sense_buffer[6], SRpnt->sr_sense_buffer[7])); | |
1740 | if (cmdstatp->have_sense) { | |
1741 | ||
1742 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) | |
1743 | cmdstatp->flags &= 0xcf; /* No need for EOM in this case */ | |
1744 | ||
1745 | if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */ | |
1746 | /* Compute the residual count */ | |
1747 | if (cmdstatp->remainder_valid) | |
1748 | transfer = (int)cmdstatp->uremainder64; | |
1749 | else | |
1750 | transfer = 0; | |
1751 | if (STp->block_size == 0 && | |
1752 | cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) | |
1753 | transfer = bytes; | |
1754 | ||
1755 | if (cmdstatp->flags & SENSE_ILI) { /* ILI */ | |
1756 | if (STp->block_size == 0) { | |
1757 | if (transfer <= 0) { | |
1758 | if (transfer < 0) | |
1759 | printk(KERN_NOTICE | |
1760 | "%s: Failed to read %d byte block with %d byte transfer.\n", | |
1761 | name, bytes - transfer, bytes); | |
1762 | if (STps->drv_block >= 0) | |
1763 | STps->drv_block += 1; | |
1764 | STbp->buffer_bytes = 0; | |
1765 | return (-ENOMEM); | |
1766 | } | |
1767 | STbp->buffer_bytes = bytes - transfer; | |
1768 | } else { | |
1769 | scsi_release_request(SRpnt); | |
1770 | SRpnt = *aSRpnt = NULL; | |
1771 | if (transfer == blks) { /* We did not get anything, error */ | |
1772 | printk(KERN_NOTICE "%s: Incorrect block size.\n", name); | |
1773 | if (STps->drv_block >= 0) | |
1774 | STps->drv_block += blks - transfer + 1; | |
1775 | st_int_ioctl(STp, MTBSR, 1); | |
1776 | return (-EIO); | |
1777 | } | |
1778 | /* We have some data, deliver it */ | |
1779 | STbp->buffer_bytes = (blks - transfer) * | |
1780 | STp->block_size; | |
1781 | DEBC(printk(ST_DEB_MSG | |
1782 | "%s: ILI but enough data received %ld %d.\n", | |
1783 | name, count, STbp->buffer_bytes)); | |
1784 | if (STps->drv_block >= 0) | |
1785 | STps->drv_block += 1; | |
1786 | if (st_int_ioctl(STp, MTBSR, 1)) | |
1787 | return (-EIO); | |
1788 | } | |
1789 | } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */ | |
1790 | if (STps->eof != ST_FM_HIT) | |
1791 | STps->eof = ST_FM_HIT; | |
1792 | else | |
1793 | STps->eof = ST_EOD_2; | |
1794 | if (STp->block_size == 0) | |
1795 | STbp->buffer_bytes = 0; | |
1796 | else | |
1797 | STbp->buffer_bytes = | |
1798 | bytes - transfer * STp->block_size; | |
1799 | DEBC(printk(ST_DEB_MSG | |
1800 | "%s: EOF detected (%d bytes read).\n", | |
1801 | name, STbp->buffer_bytes)); | |
1802 | } else if (cmdstatp->flags & SENSE_EOM) { | |
1803 | if (STps->eof == ST_FM) | |
1804 | STps->eof = ST_EOD_1; | |
1805 | else | |
1806 | STps->eof = ST_EOM_OK; | |
1807 | if (STp->block_size == 0) | |
1808 | STbp->buffer_bytes = bytes - transfer; | |
1809 | else | |
1810 | STbp->buffer_bytes = | |
1811 | bytes - transfer * STp->block_size; | |
1812 | ||
1813 | DEBC(printk(ST_DEB_MSG "%s: EOM detected (%d bytes read).\n", | |
1814 | name, STbp->buffer_bytes)); | |
1815 | } | |
1816 | } | |
1817 | /* end of EOF, EOM, ILI test */ | |
1818 | else { /* nonzero sense key */ | |
1819 | DEBC(printk(ST_DEB_MSG | |
1820 | "%s: Tape error while reading.\n", name)); | |
1821 | STps->drv_block = (-1); | |
1822 | if (STps->eof == ST_FM && | |
1823 | cmdstatp->sense_hdr.sense_key == BLANK_CHECK) { | |
1824 | DEBC(printk(ST_DEB_MSG | |
1825 | "%s: Zero returned for first BLANK CHECK after EOF.\n", | |
1826 | name)); | |
1827 | STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */ | |
1828 | } else /* Some other extended sense code */ | |
1829 | retval = (-EIO); | |
1830 | } | |
1831 | ||
1832 | if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */ | |
1833 | STbp->buffer_bytes = 0; | |
1834 | } | |
1835 | /* End of extended sense test */ | |
1836 | else { /* Non-extended sense */ | |
1837 | retval = STbp->syscall_result; | |
1838 | } | |
1839 | ||
1840 | } | |
1841 | /* End of error handling */ | |
1842 | else /* Read successful */ | |
1843 | STbp->buffer_bytes = bytes; | |
1844 | ||
1845 | if (STps->drv_block >= 0) { | |
1846 | if (STp->block_size == 0) | |
1847 | STps->drv_block++; | |
1848 | else | |
1849 | STps->drv_block += STbp->buffer_bytes / STp->block_size; | |
1850 | } | |
1851 | return retval; | |
1852 | } | |
1853 | \f | |
1854 | ||
1855 | /* Read command */ | |
1856 | static ssize_t | |
1857 | st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
1858 | { | |
1859 | ssize_t total; | |
1860 | ssize_t retval = 0; | |
1861 | ssize_t i, transfer; | |
1862 | int special, do_dio = 0; | |
1863 | struct scsi_request *SRpnt = NULL; | |
1864 | struct scsi_tape *STp = filp->private_data; | |
1865 | struct st_modedef *STm; | |
1866 | struct st_partstat *STps; | |
1867 | struct st_buffer *STbp = STp->buffer; | |
1868 | DEB( char *name = tape_name(STp); ) | |
1869 | ||
1870 | if (down_interruptible(&STp->lock)) | |
1871 | return -ERESTARTSYS; | |
1872 | ||
1873 | retval = rw_checks(STp, filp, count); | |
1874 | if (retval || count == 0) | |
1875 | goto out; | |
1876 | ||
1877 | STm = &(STp->modes[STp->current_mode]); | |
1878 | if (!(STm->do_read_ahead) && STp->block_size != 0 && | |
1879 | (count % STp->block_size) != 0) { | |
1880 | retval = (-EINVAL); /* Read must be integral number of blocks */ | |
1881 | goto out; | |
1882 | } | |
1883 | ||
1884 | STps = &(STp->ps[STp->partition]); | |
1885 | if (STps->rw == ST_WRITING) { | |
1886 | retval = flush_buffer(STp, 0); | |
1887 | if (retval) | |
1888 | goto out; | |
1889 | STps->rw = ST_READING; | |
1890 | } | |
1891 | DEB( | |
1892 | if (debugging && STps->eof != ST_NOEOF) | |
1893 | printk(ST_DEB_MSG "%s: EOF/EOM flag up (%d). Bytes %d\n", name, | |
1894 | STps->eof, STbp->buffer_bytes); | |
1895 | ) /* end DEB */ | |
1896 | ||
1897 | retval = setup_buffering(STp, buf, count, 1); | |
1898 | if (retval) | |
1899 | goto out; | |
1900 | do_dio = STbp->do_dio; | |
1901 | ||
1902 | if (STbp->buffer_bytes == 0 && | |
1903 | STps->eof >= ST_EOD_1) { | |
1904 | if (STps->eof < ST_EOD) { | |
1905 | STps->eof += 1; | |
1906 | retval = 0; | |
1907 | goto out; | |
1908 | } | |
1909 | retval = (-EIO); /* EOM or Blank Check */ | |
1910 | goto out; | |
1911 | } | |
1912 | ||
1913 | if (do_dio) { | |
1914 | /* Check the buffer writability before any tape movement. Don't alter | |
1915 | buffer data. */ | |
1916 | if (copy_from_user(&i, buf, 1) != 0 || | |
1917 | copy_to_user(buf, &i, 1) != 0 || | |
1918 | copy_from_user(&i, buf + count - 1, 1) != 0 || | |
1919 | copy_to_user(buf + count - 1, &i, 1) != 0) { | |
1920 | retval = (-EFAULT); | |
1921 | goto out; | |
1922 | } | |
1923 | } | |
1924 | ||
1925 | STps->rw = ST_READING; | |
1926 | ||
1927 | ||
1928 | /* Loop until enough data in buffer or a special condition found */ | |
1929 | for (total = 0, special = 0; total < count && !special;) { | |
1930 | ||
1931 | /* Get new data if the buffer is empty */ | |
1932 | if (STbp->buffer_bytes == 0) { | |
1933 | special = read_tape(STp, count - total, &SRpnt); | |
1934 | if (special < 0) { /* No need to continue read */ | |
1935 | retval = special; | |
1936 | goto out; | |
1937 | } | |
1938 | } | |
1939 | ||
1940 | /* Move the data from driver buffer to user buffer */ | |
1941 | if (STbp->buffer_bytes > 0) { | |
1942 | DEB( | |
1943 | if (debugging && STps->eof != ST_NOEOF) | |
1944 | printk(ST_DEB_MSG | |
1945 | "%s: EOF up (%d). Left %d, needed %d.\n", name, | |
1946 | STps->eof, STbp->buffer_bytes, | |
1947 | (int)(count - total)); | |
1948 | ) /* end DEB */ | |
1949 | transfer = STbp->buffer_bytes < count - total ? | |
1950 | STbp->buffer_bytes : count - total; | |
1951 | if (!do_dio) { | |
1952 | i = from_buffer(STbp, buf, transfer); | |
1953 | if (i) { | |
1954 | retval = i; | |
1955 | goto out; | |
1956 | } | |
1957 | } | |
1958 | buf += transfer; | |
1959 | total += transfer; | |
1960 | } | |
1961 | ||
1962 | if (STp->block_size == 0) | |
1963 | break; /* Read only one variable length block */ | |
1964 | ||
1965 | } /* for (total = 0, special = 0; | |
1966 | total < count && !special; ) */ | |
1967 | ||
1968 | /* Change the eof state if no data from tape or buffer */ | |
1969 | if (total == 0) { | |
1970 | if (STps->eof == ST_FM_HIT) { | |
1971 | STps->eof = ST_FM; | |
1972 | STps->drv_block = 0; | |
1973 | if (STps->drv_file >= 0) | |
1974 | STps->drv_file++; | |
1975 | } else if (STps->eof == ST_EOD_1) { | |
1976 | STps->eof = ST_EOD_2; | |
1977 | STps->drv_block = 0; | |
1978 | if (STps->drv_file >= 0) | |
1979 | STps->drv_file++; | |
1980 | } else if (STps->eof == ST_EOD_2) | |
1981 | STps->eof = ST_EOD; | |
1982 | } else if (STps->eof == ST_FM) | |
1983 | STps->eof = ST_NOEOF; | |
1984 | retval = total; | |
1985 | ||
1986 | out: | |
1987 | if (SRpnt != NULL) { | |
1988 | scsi_release_request(SRpnt); | |
1989 | SRpnt = NULL; | |
1990 | } | |
1991 | if (do_dio) { | |
1992 | release_buffering(STp); | |
1993 | STbp->buffer_bytes = 0; | |
1994 | } | |
1995 | up(&STp->lock); | |
1996 | ||
1997 | return retval; | |
1998 | } | |
1999 | \f | |
2000 | ||
2001 | ||
2002 | DEB( | |
2003 | /* Set the driver options */ | |
2004 | static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm, char *name) | |
2005 | { | |
2006 | if (debugging) { | |
2007 | printk(KERN_INFO | |
2008 | "%s: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n", | |
2009 | name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes, | |
2010 | STm->do_read_ahead); | |
2011 | printk(KERN_INFO | |
2012 | "%s: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n", | |
2013 | name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock); | |
2014 | printk(KERN_INFO | |
2015 | "%s: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n", | |
2016 | name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions, | |
2017 | STp->scsi2_logical); | |
2018 | printk(KERN_INFO | |
2019 | "%s: sysv: %d nowait: %d\n", name, STm->sysv, STp->immediate); | |
2020 | printk(KERN_INFO "%s: debugging: %d\n", | |
2021 | name, debugging); | |
2022 | } | |
2023 | } | |
2024 | ) | |
2025 | ||
2026 | ||
2027 | static int st_set_options(struct scsi_tape *STp, long options) | |
2028 | { | |
2029 | int value; | |
2030 | long code; | |
2031 | struct st_modedef *STm; | |
2032 | char *name = tape_name(STp); | |
2033 | struct cdev *cd0, *cd1; | |
2034 | ||
2035 | STm = &(STp->modes[STp->current_mode]); | |
2036 | if (!STm->defined) { | |
2037 | cd0 = STm->cdevs[0]; cd1 = STm->cdevs[1]; | |
2038 | memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); | |
2039 | STm->cdevs[0] = cd0; STm->cdevs[1] = cd1; | |
2040 | modes_defined = 1; | |
2041 | DEBC(printk(ST_DEB_MSG | |
2042 | "%s: Initialized mode %d definition from mode 0\n", | |
2043 | name, STp->current_mode)); | |
2044 | } | |
2045 | ||
2046 | code = options & MT_ST_OPTIONS; | |
2047 | if (code == MT_ST_BOOLEANS) { | |
2048 | STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; | |
2049 | STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; | |
2050 | STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; | |
2051 | STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; | |
2052 | STp->two_fm = (options & MT_ST_TWO_FM) != 0; | |
2053 | STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; | |
2054 | STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; | |
2055 | STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; | |
2056 | STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; | |
2057 | if ((STp->device)->scsi_level >= SCSI_2) | |
2058 | STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; | |
2059 | STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; | |
2060 | STp->immediate = (options & MT_ST_NOWAIT) != 0; | |
2061 | STm->sysv = (options & MT_ST_SYSV) != 0; | |
2062 | DEB( debugging = (options & MT_ST_DEBUGGING) != 0; | |
2063 | st_log_options(STp, STm, name); ) | |
2064 | } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { | |
2065 | value = (code == MT_ST_SETBOOLEANS); | |
2066 | if ((options & MT_ST_BUFFER_WRITES) != 0) | |
2067 | STm->do_buffer_writes = value; | |
2068 | if ((options & MT_ST_ASYNC_WRITES) != 0) | |
2069 | STm->do_async_writes = value; | |
2070 | if ((options & MT_ST_DEF_WRITES) != 0) | |
2071 | STm->defaults_for_writes = value; | |
2072 | if ((options & MT_ST_READ_AHEAD) != 0) | |
2073 | STm->do_read_ahead = value; | |
2074 | if ((options & MT_ST_TWO_FM) != 0) | |
2075 | STp->two_fm = value; | |
2076 | if ((options & MT_ST_FAST_MTEOM) != 0) | |
2077 | STp->fast_mteom = value; | |
2078 | if ((options & MT_ST_AUTO_LOCK) != 0) | |
2079 | STp->do_auto_lock = value; | |
2080 | if ((options & MT_ST_CAN_BSR) != 0) | |
2081 | STp->can_bsr = value; | |
2082 | if ((options & MT_ST_NO_BLKLIMS) != 0) | |
2083 | STp->omit_blklims = value; | |
2084 | if ((STp->device)->scsi_level >= SCSI_2 && | |
2085 | (options & MT_ST_CAN_PARTITIONS) != 0) | |
2086 | STp->can_partitions = value; | |
2087 | if ((options & MT_ST_SCSI2LOGICAL) != 0) | |
2088 | STp->scsi2_logical = value; | |
2089 | if ((options & MT_ST_NOWAIT) != 0) | |
2090 | STp->immediate = value; | |
2091 | if ((options & MT_ST_SYSV) != 0) | |
2092 | STm->sysv = value; | |
2093 | DEB( | |
2094 | if ((options & MT_ST_DEBUGGING) != 0) | |
2095 | debugging = value; | |
2096 | st_log_options(STp, STm, name); ) | |
2097 | } else if (code == MT_ST_WRITE_THRESHOLD) { | |
2098 | /* Retained for compatibility */ | |
2099 | } else if (code == MT_ST_DEF_BLKSIZE) { | |
2100 | value = (options & ~MT_ST_OPTIONS); | |
2101 | if (value == ~MT_ST_OPTIONS) { | |
2102 | STm->default_blksize = (-1); | |
2103 | DEBC( printk(KERN_INFO "%s: Default block size disabled.\n", name)); | |
2104 | } else { | |
2105 | STm->default_blksize = value; | |
2106 | DEBC( printk(KERN_INFO "%s: Default block size set to %d bytes.\n", | |
2107 | name, STm->default_blksize)); | |
2108 | if (STp->ready == ST_READY) { | |
2109 | STp->blksize_changed = 0; | |
2110 | set_mode_densblk(STp, STm); | |
2111 | } | |
2112 | } | |
2113 | } else if (code == MT_ST_TIMEOUTS) { | |
2114 | value = (options & ~MT_ST_OPTIONS); | |
2115 | if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { | |
2116 | STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; | |
2117 | DEBC( printk(KERN_INFO "%s: Long timeout set to %d seconds.\n", name, | |
2118 | (value & ~MT_ST_SET_LONG_TIMEOUT))); | |
2119 | } else { | |
2120 | STp->device->timeout = value * HZ; | |
2121 | DEBC( printk(KERN_INFO "%s: Normal timeout set to %d seconds.\n", | |
2122 | name, value) ); | |
2123 | } | |
2124 | } else if (code == MT_ST_SET_CLN) { | |
2125 | value = (options & ~MT_ST_OPTIONS) & 0xff; | |
2126 | if (value != 0 && | |
2127 | value < EXTENDED_SENSE_START && value >= SCSI_SENSE_BUFFERSIZE) | |
2128 | return (-EINVAL); | |
2129 | STp->cln_mode = value; | |
2130 | STp->cln_sense_mask = (options >> 8) & 0xff; | |
2131 | STp->cln_sense_value = (options >> 16) & 0xff; | |
2132 | printk(KERN_INFO | |
2133 | "%s: Cleaning request mode %d, mask %02x, value %02x\n", | |
2134 | name, value, STp->cln_sense_mask, STp->cln_sense_value); | |
2135 | } else if (code == MT_ST_DEF_OPTIONS) { | |
2136 | code = (options & ~MT_ST_CLEAR_DEFAULT); | |
2137 | value = (options & MT_ST_CLEAR_DEFAULT); | |
2138 | if (code == MT_ST_DEF_DENSITY) { | |
2139 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2140 | STm->default_density = (-1); | |
2141 | DEBC( printk(KERN_INFO "%s: Density default disabled.\n", | |
2142 | name)); | |
2143 | } else { | |
2144 | STm->default_density = value & 0xff; | |
2145 | DEBC( printk(KERN_INFO "%s: Density default set to %x\n", | |
2146 | name, STm->default_density)); | |
2147 | if (STp->ready == ST_READY) { | |
2148 | STp->density_changed = 0; | |
2149 | set_mode_densblk(STp, STm); | |
2150 | } | |
2151 | } | |
2152 | } else if (code == MT_ST_DEF_DRVBUFFER) { | |
2153 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2154 | STp->default_drvbuffer = 0xff; | |
2155 | DEBC( printk(KERN_INFO | |
2156 | "%s: Drive buffer default disabled.\n", name)); | |
2157 | } else { | |
2158 | STp->default_drvbuffer = value & 7; | |
2159 | DEBC( printk(KERN_INFO | |
2160 | "%s: Drive buffer default set to %x\n", | |
2161 | name, STp->default_drvbuffer)); | |
2162 | if (STp->ready == ST_READY) | |
2163 | st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer); | |
2164 | } | |
2165 | } else if (code == MT_ST_DEF_COMPRESSION) { | |
2166 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2167 | STm->default_compression = ST_DONT_TOUCH; | |
2168 | DEBC( printk(KERN_INFO | |
2169 | "%s: Compression default disabled.\n", name)); | |
2170 | } else { | |
2171 | if ((value & 0xff00) != 0) { | |
2172 | STp->c_algo = (value & 0xff00) >> 8; | |
2173 | DEBC( printk(KERN_INFO "%s: Compression algorithm set to 0x%x.\n", | |
2174 | name, STp->c_algo)); | |
2175 | } | |
2176 | if ((value & 0xff) != 0xff) { | |
2177 | STm->default_compression = (value & 1 ? ST_YES : ST_NO); | |
2178 | DEBC( printk(KERN_INFO "%s: Compression default set to %x\n", | |
2179 | name, (value & 1))); | |
2180 | if (STp->ready == ST_READY) { | |
2181 | STp->compression_changed = 0; | |
2182 | st_compression(STp, (STm->default_compression == ST_YES)); | |
2183 | } | |
2184 | } | |
2185 | } | |
2186 | } | |
2187 | } else | |
2188 | return (-EIO); | |
2189 | ||
2190 | return 0; | |
2191 | } | |
2192 | \f | |
2193 | #define MODE_HEADER_LENGTH 4 | |
2194 | ||
2195 | /* Mode header and page byte offsets */ | |
2196 | #define MH_OFF_DATA_LENGTH 0 | |
2197 | #define MH_OFF_MEDIUM_TYPE 1 | |
2198 | #define MH_OFF_DEV_SPECIFIC 2 | |
2199 | #define MH_OFF_BDESCS_LENGTH 3 | |
2200 | #define MP_OFF_PAGE_NBR 0 | |
2201 | #define MP_OFF_PAGE_LENGTH 1 | |
2202 | ||
2203 | /* Mode header and page bit masks */ | |
2204 | #define MH_BIT_WP 0x80 | |
2205 | #define MP_MSK_PAGE_NBR 0x3f | |
2206 | ||
2207 | /* Don't return block descriptors */ | |
2208 | #define MODE_SENSE_OMIT_BDESCS 0x08 | |
2209 | ||
2210 | #define MODE_SELECT_PAGE_FORMAT 0x10 | |
2211 | ||
2212 | /* Read a mode page into the tape buffer. The block descriptors are included | |
2213 | if incl_block_descs is true. The page control is ored to the page number | |
2214 | parameter, if necessary. */ | |
2215 | static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) | |
2216 | { | |
2217 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
2218 | struct scsi_request *SRpnt = NULL; | |
2219 | ||
2220 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2221 | cmd[0] = MODE_SENSE; | |
2222 | if (omit_block_descs) | |
2223 | cmd[1] = MODE_SENSE_OMIT_BDESCS; | |
2224 | cmd[2] = page; | |
2225 | cmd[4] = 255; | |
2226 | ||
2227 | SRpnt = st_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_FROM_DEVICE, | |
2228 | STp->device->timeout, 0, 1); | |
2229 | if (SRpnt == NULL) | |
2230 | return (STp->buffer)->syscall_result; | |
2231 | ||
2232 | scsi_release_request(SRpnt); | |
2233 | ||
2234 | return (STp->buffer)->syscall_result; | |
2235 | } | |
2236 | ||
2237 | ||
2238 | /* Send the mode page in the tape buffer to the drive. Assumes that the mode data | |
2239 | in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ | |
2240 | static int write_mode_page(struct scsi_tape *STp, int page, int slow) | |
2241 | { | |
2242 | int pgo; | |
2243 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
2244 | struct scsi_request *SRpnt = NULL; | |
2245 | ||
2246 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2247 | cmd[0] = MODE_SELECT; | |
2248 | cmd[1] = MODE_SELECT_PAGE_FORMAT; | |
2249 | pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH]; | |
2250 | cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2; | |
2251 | ||
2252 | /* Clear reserved fields */ | |
2253 | (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0; | |
2254 | (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0; | |
2255 | (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; | |
2256 | (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; | |
2257 | ||
2258 | SRpnt = st_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_TO_DEVICE, | |
2259 | (slow ? STp->long_timeout : STp->device->timeout), 0, 1); | |
2260 | if (SRpnt == NULL) | |
2261 | return (STp->buffer)->syscall_result; | |
2262 | ||
2263 | scsi_release_request(SRpnt); | |
2264 | ||
2265 | return (STp->buffer)->syscall_result; | |
2266 | } | |
2267 | ||
2268 | ||
2269 | #define COMPRESSION_PAGE 0x0f | |
2270 | #define COMPRESSION_PAGE_LENGTH 16 | |
2271 | ||
2272 | #define CP_OFF_DCE_DCC 2 | |
2273 | #define CP_OFF_C_ALGO 7 | |
2274 | ||
2275 | #define DCE_MASK 0x80 | |
2276 | #define DCC_MASK 0x40 | |
2277 | #define RED_MASK 0x60 | |
2278 | ||
2279 | ||
2280 | /* Control the compression with mode page 15. Algorithm not changed if zero. | |
2281 | ||
2282 | The block descriptors are read and written because Sony SDT-7000 does not | |
2283 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). | |
2284 | Including block descriptors should not cause any harm to other drives. */ | |
2285 | ||
2286 | static int st_compression(struct scsi_tape * STp, int state) | |
2287 | { | |
2288 | int retval; | |
2289 | int mpoffs; /* Offset to mode page start */ | |
2290 | unsigned char *b_data = (STp->buffer)->b_data; | |
2291 | DEB( char *name = tape_name(STp); ) | |
2292 | ||
2293 | if (STp->ready != ST_READY) | |
2294 | return (-EIO); | |
2295 | ||
2296 | /* Read the current page contents */ | |
2297 | retval = read_mode_page(STp, COMPRESSION_PAGE, 0); | |
2298 | if (retval) { | |
2299 | DEBC(printk(ST_DEB_MSG "%s: Compression mode page not supported.\n", | |
2300 | name)); | |
2301 | return (-EIO); | |
2302 | } | |
2303 | ||
2304 | mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; | |
2305 | DEBC(printk(ST_DEB_MSG "%s: Compression state is %d.\n", name, | |
2306 | (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0))); | |
2307 | ||
2308 | /* Check if compression can be changed */ | |
2309 | if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) { | |
2310 | DEBC(printk(ST_DEB_MSG "%s: Compression not supported.\n", name)); | |
2311 | return (-EIO); | |
2312 | } | |
2313 | ||
2314 | /* Do the change */ | |
2315 | if (state) { | |
2316 | b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK; | |
2317 | if (STp->c_algo != 0) | |
2318 | b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo; | |
2319 | } | |
2320 | else { | |
2321 | b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK; | |
2322 | if (STp->c_algo != 0) | |
2323 | b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */ | |
2324 | } | |
2325 | ||
2326 | retval = write_mode_page(STp, COMPRESSION_PAGE, 0); | |
2327 | if (retval) { | |
2328 | DEBC(printk(ST_DEB_MSG "%s: Compression change failed.\n", name)); | |
2329 | return (-EIO); | |
2330 | } | |
2331 | DEBC(printk(ST_DEB_MSG "%s: Compression state changed to %d.\n", | |
2332 | name, state)); | |
2333 | ||
2334 | STp->compression_changed = 1; | |
2335 | return 0; | |
2336 | } | |
2337 | ||
2338 | ||
2339 | /* Process the load and unload commands (does unload if the load code is zero) */ | |
2340 | static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code) | |
2341 | { | |
2342 | int retval = (-EIO), timeout; | |
2343 | DEB( char *name = tape_name(STp); ) | |
2344 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
2345 | struct st_partstat *STps; | |
2346 | struct scsi_request *SRpnt; | |
2347 | ||
2348 | if (STp->ready != ST_READY && !load_code) { | |
2349 | if (STp->ready == ST_NO_TAPE) | |
2350 | return (-ENOMEDIUM); | |
2351 | else | |
2352 | return (-EIO); | |
2353 | } | |
2354 | ||
2355 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2356 | cmd[0] = START_STOP; | |
2357 | if (load_code) | |
2358 | cmd[4] |= 1; | |
2359 | /* | |
2360 | * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A | |
2361 | */ | |
2362 | if (load_code >= 1 + MT_ST_HPLOADER_OFFSET | |
2363 | && load_code <= 6 + MT_ST_HPLOADER_OFFSET) { | |
2364 | DEBC(printk(ST_DEB_MSG "%s: Enhanced %sload slot %2d.\n", | |
2365 | name, (cmd[4]) ? "" : "un", | |
2366 | load_code - MT_ST_HPLOADER_OFFSET)); | |
2367 | cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ | |
2368 | } | |
2369 | if (STp->immediate) { | |
2370 | cmd[1] = 1; /* Don't wait for completion */ | |
2371 | timeout = STp->device->timeout; | |
2372 | } | |
2373 | else | |
2374 | timeout = STp->long_timeout; | |
2375 | ||
2376 | DEBC( | |
2377 | if (!load_code) | |
2378 | printk(ST_DEB_MSG "%s: Unloading tape.\n", name); | |
2379 | else | |
2380 | printk(ST_DEB_MSG "%s: Loading tape.\n", name); | |
2381 | ); | |
2382 | ||
2383 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, | |
2384 | timeout, MAX_RETRIES, 1); | |
2385 | if (!SRpnt) | |
2386 | return (STp->buffer)->syscall_result; | |
2387 | ||
2388 | retval = (STp->buffer)->syscall_result; | |
2389 | scsi_release_request(SRpnt); | |
2390 | ||
2391 | if (!retval) { /* SCSI command successful */ | |
2392 | ||
2393 | if (!load_code) { | |
2394 | STp->rew_at_close = 0; | |
2395 | STp->ready = ST_NO_TAPE; | |
2396 | } | |
2397 | else { | |
2398 | STp->rew_at_close = STp->autorew_dev; | |
2399 | retval = check_tape(STp, filp); | |
2400 | if (retval > 0) | |
2401 | retval = 0; | |
2402 | } | |
2403 | } | |
2404 | else { | |
2405 | STps = &(STp->ps[STp->partition]); | |
2406 | STps->drv_file = STps->drv_block = (-1); | |
2407 | } | |
2408 | ||
2409 | return retval; | |
2410 | } | |
2411 | \f | |
2412 | #if DEBUG | |
2413 | #define ST_DEB_FORWARD 0 | |
2414 | #define ST_DEB_BACKWARD 1 | |
2415 | static void deb_space_print(char *name, int direction, char *units, unsigned char *cmd) | |
2416 | { | |
2417 | s32 sc; | |
2418 | ||
2419 | sc = cmd[2] & 0x80 ? 0xff000000 : 0; | |
2420 | sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; | |
2421 | if (direction) | |
2422 | sc = -sc; | |
2423 | printk(ST_DEB_MSG "%s: Spacing tape %s over %d %s.\n", name, | |
2424 | direction ? "backward" : "forward", sc, units); | |
2425 | } | |
2426 | #endif | |
2427 | ||
2428 | ||
2429 | /* Internal ioctl function */ | |
2430 | static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) | |
2431 | { | |
2432 | int timeout; | |
2433 | long ltmp; | |
2434 | int ioctl_result; | |
2435 | int chg_eof = 1; | |
2436 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
2437 | struct scsi_request *SRpnt; | |
2438 | struct st_partstat *STps; | |
2439 | int fileno, blkno, at_sm, undone; | |
2440 | int datalen = 0, direction = DMA_NONE; | |
2441 | char *name = tape_name(STp); | |
2442 | ||
2443 | WARN_ON(STp->buffer->do_dio != 0); | |
2444 | if (STp->ready != ST_READY) { | |
2445 | if (STp->ready == ST_NO_TAPE) | |
2446 | return (-ENOMEDIUM); | |
2447 | else | |
2448 | return (-EIO); | |
2449 | } | |
2450 | timeout = STp->long_timeout; | |
2451 | STps = &(STp->ps[STp->partition]); | |
2452 | fileno = STps->drv_file; | |
2453 | blkno = STps->drv_block; | |
2454 | at_sm = STps->at_sm; | |
2455 | ||
2456 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2457 | switch (cmd_in) { | |
2458 | case MTFSFM: | |
2459 | chg_eof = 0; /* Changed from the FSF after this */ | |
2460 | case MTFSF: | |
2461 | cmd[0] = SPACE; | |
2462 | cmd[1] = 0x01; /* Space FileMarks */ | |
2463 | cmd[2] = (arg >> 16); | |
2464 | cmd[3] = (arg >> 8); | |
2465 | cmd[4] = arg; | |
2466 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "filemarks", cmd);) | |
2467 | if (fileno >= 0) | |
2468 | fileno += arg; | |
2469 | blkno = 0; | |
2470 | at_sm &= (arg == 0); | |
2471 | break; | |
2472 | case MTBSFM: | |
2473 | chg_eof = 0; /* Changed from the FSF after this */ | |
2474 | case MTBSF: | |
2475 | cmd[0] = SPACE; | |
2476 | cmd[1] = 0x01; /* Space FileMarks */ | |
2477 | ltmp = (-arg); | |
2478 | cmd[2] = (ltmp >> 16); | |
2479 | cmd[3] = (ltmp >> 8); | |
2480 | cmd[4] = ltmp; | |
2481 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "filemarks", cmd);) | |
2482 | if (fileno >= 0) | |
2483 | fileno -= arg; | |
2484 | blkno = (-1); /* We can't know the block number */ | |
2485 | at_sm &= (arg == 0); | |
2486 | break; | |
2487 | case MTFSR: | |
2488 | cmd[0] = SPACE; | |
2489 | cmd[1] = 0x00; /* Space Blocks */ | |
2490 | cmd[2] = (arg >> 16); | |
2491 | cmd[3] = (arg >> 8); | |
2492 | cmd[4] = arg; | |
2493 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "blocks", cmd);) | |
2494 | if (blkno >= 0) | |
2495 | blkno += arg; | |
2496 | at_sm &= (arg == 0); | |
2497 | break; | |
2498 | case MTBSR: | |
2499 | cmd[0] = SPACE; | |
2500 | cmd[1] = 0x00; /* Space Blocks */ | |
2501 | ltmp = (-arg); | |
2502 | cmd[2] = (ltmp >> 16); | |
2503 | cmd[3] = (ltmp >> 8); | |
2504 | cmd[4] = ltmp; | |
2505 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "blocks", cmd);) | |
2506 | if (blkno >= 0) | |
2507 | blkno -= arg; | |
2508 | at_sm &= (arg == 0); | |
2509 | break; | |
2510 | case MTFSS: | |
2511 | cmd[0] = SPACE; | |
2512 | cmd[1] = 0x04; /* Space Setmarks */ | |
2513 | cmd[2] = (arg >> 16); | |
2514 | cmd[3] = (arg >> 8); | |
2515 | cmd[4] = arg; | |
2516 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "setmarks", cmd);) | |
2517 | if (arg != 0) { | |
2518 | blkno = fileno = (-1); | |
2519 | at_sm = 1; | |
2520 | } | |
2521 | break; | |
2522 | case MTBSS: | |
2523 | cmd[0] = SPACE; | |
2524 | cmd[1] = 0x04; /* Space Setmarks */ | |
2525 | ltmp = (-arg); | |
2526 | cmd[2] = (ltmp >> 16); | |
2527 | cmd[3] = (ltmp >> 8); | |
2528 | cmd[4] = ltmp; | |
2529 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "setmarks", cmd);) | |
2530 | if (arg != 0) { | |
2531 | blkno = fileno = (-1); | |
2532 | at_sm = 1; | |
2533 | } | |
2534 | break; | |
2535 | case MTWEOF: | |
2536 | case MTWSM: | |
2537 | if (STp->write_prot) | |
2538 | return (-EACCES); | |
2539 | cmd[0] = WRITE_FILEMARKS; | |
2540 | if (cmd_in == MTWSM) | |
2541 | cmd[1] = 2; | |
2542 | cmd[2] = (arg >> 16); | |
2543 | cmd[3] = (arg >> 8); | |
2544 | cmd[4] = arg; | |
2545 | timeout = STp->device->timeout; | |
2546 | DEBC( | |
2547 | if (cmd_in == MTWEOF) | |
2548 | printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name, | |
2549 | cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); | |
2550 | else | |
2551 | printk(ST_DEB_MSG "%s: Writing %d setmarks.\n", name, | |
2552 | cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); | |
2553 | ) | |
2554 | if (fileno >= 0) | |
2555 | fileno += arg; | |
2556 | blkno = 0; | |
2557 | at_sm = (cmd_in == MTWSM); | |
2558 | break; | |
2559 | case MTREW: | |
2560 | cmd[0] = REZERO_UNIT; | |
2561 | if (STp->immediate) { | |
2562 | cmd[1] = 1; /* Don't wait for completion */ | |
2563 | timeout = STp->device->timeout; | |
2564 | } | |
2565 | DEBC(printk(ST_DEB_MSG "%s: Rewinding tape.\n", name)); | |
2566 | fileno = blkno = at_sm = 0; | |
2567 | break; | |
2568 | case MTNOP: | |
2569 | DEBC(printk(ST_DEB_MSG "%s: No op on tape.\n", name)); | |
2570 | return 0; /* Should do something ? */ | |
2571 | break; | |
2572 | case MTRETEN: | |
2573 | cmd[0] = START_STOP; | |
2574 | if (STp->immediate) { | |
2575 | cmd[1] = 1; /* Don't wait for completion */ | |
2576 | timeout = STp->device->timeout; | |
2577 | } | |
2578 | cmd[4] = 3; | |
2579 | DEBC(printk(ST_DEB_MSG "%s: Retensioning tape.\n", name)); | |
2580 | fileno = blkno = at_sm = 0; | |
2581 | break; | |
2582 | case MTEOM: | |
2583 | if (!STp->fast_mteom) { | |
2584 | /* space to the end of tape */ | |
2585 | ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); | |
2586 | fileno = STps->drv_file; | |
2587 | if (STps->eof >= ST_EOD_1) | |
2588 | return 0; | |
2589 | /* The next lines would hide the number of spaced FileMarks | |
2590 | That's why I inserted the previous lines. I had no luck | |
2591 | with detecting EOM with FSF, so we go now to EOM. | |
2592 | Joerg Weule */ | |
2593 | } else | |
2594 | fileno = (-1); | |
2595 | cmd[0] = SPACE; | |
2596 | cmd[1] = 3; | |
2597 | DEBC(printk(ST_DEB_MSG "%s: Spacing to end of recorded medium.\n", | |
2598 | name)); | |
2599 | blkno = -1; | |
2600 | at_sm = 0; | |
2601 | break; | |
2602 | case MTERASE: | |
2603 | if (STp->write_prot) | |
2604 | return (-EACCES); | |
2605 | cmd[0] = ERASE; | |
2606 | cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ | |
2607 | if (STp->immediate) { | |
2608 | cmd[1] |= 2; /* Don't wait for completion */ | |
2609 | timeout = STp->device->timeout; | |
2610 | } | |
2611 | else | |
2612 | timeout = STp->long_timeout * 8; | |
2613 | ||
2614 | DEBC(printk(ST_DEB_MSG "%s: Erasing tape.\n", name)); | |
2615 | fileno = blkno = at_sm = 0; | |
2616 | break; | |
2617 | case MTSETBLK: /* Set block length */ | |
2618 | case MTSETDENSITY: /* Set tape density */ | |
2619 | case MTSETDRVBUFFER: /* Set drive buffering */ | |
2620 | case SET_DENS_AND_BLK: /* Set density and block size */ | |
2621 | chg_eof = 0; | |
2622 | if (STp->dirty || (STp->buffer)->buffer_bytes != 0) | |
2623 | return (-EIO); /* Not allowed if data in buffer */ | |
2624 | if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && | |
2625 | (arg & MT_ST_BLKSIZE_MASK) != 0 && | |
2626 | STp->max_block > 0 && | |
2627 | ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || | |
2628 | (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { | |
2629 | printk(KERN_WARNING "%s: Illegal block size.\n", name); | |
2630 | return (-EINVAL); | |
2631 | } | |
2632 | cmd[0] = MODE_SELECT; | |
2633 | if ((STp->use_pf & USE_PF)) | |
2634 | cmd[1] = MODE_SELECT_PAGE_FORMAT; | |
2635 | cmd[4] = datalen = 12; | |
2636 | direction = DMA_TO_DEVICE; | |
2637 | ||
2638 | memset((STp->buffer)->b_data, 0, 12); | |
2639 | if (cmd_in == MTSETDRVBUFFER) | |
2640 | (STp->buffer)->b_data[2] = (arg & 7) << 4; | |
2641 | else | |
2642 | (STp->buffer)->b_data[2] = | |
2643 | STp->drv_buffer << 4; | |
2644 | (STp->buffer)->b_data[3] = 8; /* block descriptor length */ | |
2645 | if (cmd_in == MTSETDENSITY) { | |
2646 | (STp->buffer)->b_data[4] = arg; | |
2647 | STp->density_changed = 1; /* At least we tried ;-) */ | |
2648 | } else if (cmd_in == SET_DENS_AND_BLK) | |
2649 | (STp->buffer)->b_data[4] = arg >> 24; | |
2650 | else | |
2651 | (STp->buffer)->b_data[4] = STp->density; | |
2652 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { | |
2653 | ltmp = arg & MT_ST_BLKSIZE_MASK; | |
2654 | if (cmd_in == MTSETBLK) | |
2655 | STp->blksize_changed = 1; /* At least we tried ;-) */ | |
2656 | } else | |
2657 | ltmp = STp->block_size; | |
2658 | (STp->buffer)->b_data[9] = (ltmp >> 16); | |
2659 | (STp->buffer)->b_data[10] = (ltmp >> 8); | |
2660 | (STp->buffer)->b_data[11] = ltmp; | |
2661 | timeout = STp->device->timeout; | |
2662 | DEBC( | |
2663 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) | |
2664 | printk(ST_DEB_MSG | |
2665 | "%s: Setting block size to %d bytes.\n", name, | |
2666 | (STp->buffer)->b_data[9] * 65536 + | |
2667 | (STp->buffer)->b_data[10] * 256 + | |
2668 | (STp->buffer)->b_data[11]); | |
2669 | if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) | |
2670 | printk(ST_DEB_MSG | |
2671 | "%s: Setting density code to %x.\n", name, | |
2672 | (STp->buffer)->b_data[4]); | |
2673 | if (cmd_in == MTSETDRVBUFFER) | |
2674 | printk(ST_DEB_MSG | |
2675 | "%s: Setting drive buffer code to %d.\n", name, | |
2676 | ((STp->buffer)->b_data[2] >> 4) & 7); | |
2677 | ) | |
2678 | break; | |
2679 | default: | |
2680 | return (-ENOSYS); | |
2681 | } | |
2682 | ||
2683 | SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, | |
2684 | timeout, MAX_RETRIES, 1); | |
2685 | if (!SRpnt) | |
2686 | return (STp->buffer)->syscall_result; | |
2687 | ||
2688 | ioctl_result = (STp->buffer)->syscall_result; | |
2689 | ||
2690 | if (!ioctl_result) { /* SCSI command successful */ | |
2691 | scsi_release_request(SRpnt); | |
2692 | SRpnt = NULL; | |
2693 | STps->drv_block = blkno; | |
2694 | STps->drv_file = fileno; | |
2695 | STps->at_sm = at_sm; | |
2696 | ||
2697 | if (cmd_in == MTBSFM) | |
2698 | ioctl_result = st_int_ioctl(STp, MTFSF, 1); | |
2699 | else if (cmd_in == MTFSFM) | |
2700 | ioctl_result = st_int_ioctl(STp, MTBSF, 1); | |
2701 | ||
2702 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { | |
2703 | int old_block_size = STp->block_size; | |
2704 | STp->block_size = arg & MT_ST_BLKSIZE_MASK; | |
2705 | if (STp->block_size != 0) { | |
2706 | if (old_block_size == 0) | |
2707 | normalize_buffer(STp->buffer); | |
2708 | (STp->buffer)->buffer_blocks = | |
2709 | (STp->buffer)->buffer_size / STp->block_size; | |
2710 | } | |
2711 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; | |
2712 | if (cmd_in == SET_DENS_AND_BLK) | |
2713 | STp->density = arg >> MT_ST_DENSITY_SHIFT; | |
2714 | } else if (cmd_in == MTSETDRVBUFFER) | |
2715 | STp->drv_buffer = (arg & 7); | |
2716 | else if (cmd_in == MTSETDENSITY) | |
2717 | STp->density = arg; | |
2718 | ||
2719 | if (cmd_in == MTEOM) | |
2720 | STps->eof = ST_EOD; | |
2721 | else if (cmd_in == MTFSF) | |
2722 | STps->eof = ST_FM; | |
2723 | else if (chg_eof) | |
2724 | STps->eof = ST_NOEOF; | |
2725 | ||
2726 | if (cmd_in == MTWEOF) | |
2727 | STps->rw = ST_IDLE; | |
2728 | } else { /* SCSI command was not completely successful. Don't return | |
2729 | from this block without releasing the SCSI command block! */ | |
2730 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
2731 | ||
2732 | if (cmdstatp->flags & SENSE_EOM) { | |
2733 | if (cmd_in != MTBSF && cmd_in != MTBSFM && | |
2734 | cmd_in != MTBSR && cmd_in != MTBSS) | |
2735 | STps->eof = ST_EOM_OK; | |
2736 | STps->drv_block = 0; | |
2737 | } | |
2738 | ||
2739 | if (cmdstatp->remainder_valid) | |
2740 | undone = (int)cmdstatp->uremainder64; | |
2741 | else | |
2742 | undone = 0; | |
2743 | ||
2744 | if (cmd_in == MTWEOF && | |
2745 | cmdstatp->have_sense && | |
2746 | (cmdstatp->flags & SENSE_EOM) && | |
2747 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
2748 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && | |
2749 | undone == 0) { | |
2750 | ioctl_result = 0; /* EOF written succesfully at EOM */ | |
2751 | if (fileno >= 0) | |
2752 | fileno++; | |
2753 | STps->drv_file = fileno; | |
2754 | STps->eof = ST_NOEOF; | |
2755 | } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { | |
2756 | if (fileno >= 0) | |
2757 | STps->drv_file = fileno - undone; | |
2758 | else | |
2759 | STps->drv_file = fileno; | |
2760 | STps->drv_block = -1; | |
2761 | STps->eof = ST_NOEOF; | |
2762 | } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { | |
2763 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ | |
2764 | undone = (-undone); | |
2765 | if (STps->drv_file >= 0) | |
2766 | STps->drv_file = fileno + undone; | |
2767 | STps->drv_block = 0; | |
2768 | STps->eof = ST_NOEOF; | |
2769 | } else if (cmd_in == MTFSR) { | |
2770 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ | |
2771 | if (STps->drv_file >= 0) | |
2772 | STps->drv_file++; | |
2773 | STps->drv_block = 0; | |
2774 | STps->eof = ST_FM; | |
2775 | } else { | |
2776 | if (blkno >= undone) | |
2777 | STps->drv_block = blkno - undone; | |
2778 | else | |
2779 | STps->drv_block = (-1); | |
2780 | STps->eof = ST_NOEOF; | |
2781 | } | |
2782 | } else if (cmd_in == MTBSR) { | |
2783 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ | |
2784 | STps->drv_file--; | |
2785 | STps->drv_block = (-1); | |
2786 | } else { | |
2787 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ | |
2788 | undone = (-undone); | |
2789 | if (STps->drv_block >= 0) | |
2790 | STps->drv_block = blkno + undone; | |
2791 | } | |
2792 | STps->eof = ST_NOEOF; | |
2793 | } else if (cmd_in == MTEOM) { | |
2794 | STps->drv_file = (-1); | |
2795 | STps->drv_block = (-1); | |
2796 | STps->eof = ST_EOD; | |
2797 | } else if (cmd_in == MTSETBLK || | |
2798 | cmd_in == MTSETDENSITY || | |
2799 | cmd_in == MTSETDRVBUFFER || | |
2800 | cmd_in == SET_DENS_AND_BLK) { | |
2801 | if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && | |
2802 | !(STp->use_pf & PF_TESTED)) { | |
2803 | /* Try the other possible state of Page Format if not | |
2804 | already tried */ | |
2805 | STp->use_pf = !STp->use_pf | PF_TESTED; | |
2806 | scsi_release_request(SRpnt); | |
2807 | SRpnt = NULL; | |
2808 | return st_int_ioctl(STp, cmd_in, arg); | |
2809 | } | |
2810 | } else if (chg_eof) | |
2811 | STps->eof = ST_NOEOF; | |
2812 | ||
2813 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) | |
2814 | STps->eof = ST_EOD; | |
2815 | ||
2816 | scsi_release_request(SRpnt); | |
2817 | SRpnt = NULL; | |
2818 | } | |
2819 | ||
2820 | return ioctl_result; | |
2821 | } | |
2822 | \f | |
2823 | ||
2824 | /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc | |
2825 | structure. */ | |
2826 | ||
2827 | static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, | |
2828 | int logical) | |
2829 | { | |
2830 | int result; | |
2831 | unsigned char scmd[MAX_COMMAND_SIZE]; | |
2832 | struct scsi_request *SRpnt; | |
2833 | DEB( char *name = tape_name(STp); ) | |
2834 | ||
2835 | if (STp->ready != ST_READY) | |
2836 | return (-EIO); | |
2837 | ||
2838 | memset(scmd, 0, MAX_COMMAND_SIZE); | |
2839 | if ((STp->device)->scsi_level < SCSI_2) { | |
2840 | scmd[0] = QFA_REQUEST_BLOCK; | |
2841 | scmd[4] = 3; | |
2842 | } else { | |
2843 | scmd[0] = READ_POSITION; | |
2844 | if (!logical && !STp->scsi2_logical) | |
2845 | scmd[1] = 1; | |
2846 | } | |
2847 | SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, | |
2848 | STp->device->timeout, MAX_READY_RETRIES, 1); | |
2849 | if (!SRpnt) | |
2850 | return (STp->buffer)->syscall_result; | |
2851 | ||
2852 | if ((STp->buffer)->syscall_result != 0 || | |
2853 | (STp->device->scsi_level >= SCSI_2 && | |
2854 | ((STp->buffer)->b_data[0] & 4) != 0)) { | |
2855 | *block = *partition = 0; | |
2856 | DEBC(printk(ST_DEB_MSG "%s: Can't read tape position.\n", name)); | |
2857 | result = (-EIO); | |
2858 | } else { | |
2859 | result = 0; | |
2860 | if ((STp->device)->scsi_level < SCSI_2) { | |
2861 | *block = ((STp->buffer)->b_data[0] << 16) | |
2862 | + ((STp->buffer)->b_data[1] << 8) | |
2863 | + (STp->buffer)->b_data[2]; | |
2864 | *partition = 0; | |
2865 | } else { | |
2866 | *block = ((STp->buffer)->b_data[4] << 24) | |
2867 | + ((STp->buffer)->b_data[5] << 16) | |
2868 | + ((STp->buffer)->b_data[6] << 8) | |
2869 | + (STp->buffer)->b_data[7]; | |
2870 | *partition = (STp->buffer)->b_data[1]; | |
2871 | if (((STp->buffer)->b_data[0] & 0x80) && | |
2872 | (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ | |
2873 | STp->ps[0].drv_block = STp->ps[0].drv_file = 0; | |
2874 | } | |
2875 | DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name, | |
2876 | *block, *partition)); | |
2877 | } | |
2878 | scsi_release_request(SRpnt); | |
2879 | SRpnt = NULL; | |
2880 | ||
2881 | return result; | |
2882 | } | |
2883 | ||
2884 | ||
2885 | /* Set the tape block and partition. Negative partition means that only the | |
2886 | block should be set in vendor specific way. */ | |
2887 | static int set_location(struct scsi_tape *STp, unsigned int block, int partition, | |
2888 | int logical) | |
2889 | { | |
2890 | struct st_partstat *STps; | |
2891 | int result, p; | |
2892 | unsigned int blk; | |
2893 | int timeout; | |
2894 | unsigned char scmd[MAX_COMMAND_SIZE]; | |
2895 | struct scsi_request *SRpnt; | |
2896 | DEB( char *name = tape_name(STp); ) | |
2897 | ||
2898 | if (STp->ready != ST_READY) | |
2899 | return (-EIO); | |
2900 | timeout = STp->long_timeout; | |
2901 | STps = &(STp->ps[STp->partition]); | |
2902 | ||
2903 | DEBC(printk(ST_DEB_MSG "%s: Setting block to %d and partition to %d.\n", | |
2904 | name, block, partition)); | |
2905 | DEB(if (partition < 0) | |
2906 | return (-EIO); ) | |
2907 | ||
2908 | /* Update the location at the partition we are leaving */ | |
2909 | if ((!STp->can_partitions && partition != 0) || | |
2910 | partition >= ST_NBR_PARTITIONS) | |
2911 | return (-EINVAL); | |
2912 | if (partition != STp->partition) { | |
2913 | if (get_location(STp, &blk, &p, 1)) | |
2914 | STps->last_block_valid = 0; | |
2915 | else { | |
2916 | STps->last_block_valid = 1; | |
2917 | STps->last_block_visited = blk; | |
2918 | DEBC(printk(ST_DEB_MSG | |
2919 | "%s: Visited block %d for partition %d saved.\n", | |
2920 | name, blk, STp->partition)); | |
2921 | } | |
2922 | } | |
2923 | ||
2924 | memset(scmd, 0, MAX_COMMAND_SIZE); | |
2925 | if ((STp->device)->scsi_level < SCSI_2) { | |
2926 | scmd[0] = QFA_SEEK_BLOCK; | |
2927 | scmd[2] = (block >> 16); | |
2928 | scmd[3] = (block >> 8); | |
2929 | scmd[4] = block; | |
2930 | scmd[5] = 0; | |
2931 | } else { | |
2932 | scmd[0] = SEEK_10; | |
2933 | scmd[3] = (block >> 24); | |
2934 | scmd[4] = (block >> 16); | |
2935 | scmd[5] = (block >> 8); | |
2936 | scmd[6] = block; | |
2937 | if (!logical && !STp->scsi2_logical) | |
2938 | scmd[1] = 4; | |
2939 | if (STp->partition != partition) { | |
2940 | scmd[1] |= 2; | |
2941 | scmd[8] = partition; | |
2942 | DEBC(printk(ST_DEB_MSG | |
2943 | "%s: Trying to change partition from %d to %d\n", | |
2944 | name, STp->partition, partition)); | |
2945 | } | |
2946 | } | |
2947 | if (STp->immediate) { | |
2948 | scmd[1] |= 1; /* Don't wait for completion */ | |
2949 | timeout = STp->device->timeout; | |
2950 | } | |
2951 | ||
2952 | SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, | |
2953 | timeout, MAX_READY_RETRIES, 1); | |
2954 | if (!SRpnt) | |
2955 | return (STp->buffer)->syscall_result; | |
2956 | ||
2957 | STps->drv_block = STps->drv_file = (-1); | |
2958 | STps->eof = ST_NOEOF; | |
2959 | if ((STp->buffer)->syscall_result != 0) { | |
2960 | result = (-EIO); | |
2961 | if (STp->can_partitions && | |
2962 | (STp->device)->scsi_level >= SCSI_2 && | |
2963 | (p = find_partition(STp)) >= 0) | |
2964 | STp->partition = p; | |
2965 | } else { | |
2966 | if (STp->can_partitions) { | |
2967 | STp->partition = partition; | |
2968 | STps = &(STp->ps[partition]); | |
2969 | if (!STps->last_block_valid || | |
2970 | STps->last_block_visited != block) { | |
2971 | STps->at_sm = 0; | |
2972 | STps->rw = ST_IDLE; | |
2973 | } | |
2974 | } else | |
2975 | STps->at_sm = 0; | |
2976 | if (block == 0) | |
2977 | STps->drv_block = STps->drv_file = 0; | |
2978 | result = 0; | |
2979 | } | |
2980 | ||
2981 | scsi_release_request(SRpnt); | |
2982 | SRpnt = NULL; | |
2983 | ||
2984 | return result; | |
2985 | } | |
2986 | ||
2987 | ||
2988 | /* Find the current partition number for the drive status. Called from open and | |
2989 | returns either partition number of negative error code. */ | |
2990 | static int find_partition(struct scsi_tape *STp) | |
2991 | { | |
2992 | int i, partition; | |
2993 | unsigned int block; | |
2994 | ||
2995 | if ((i = get_location(STp, &block, &partition, 1)) < 0) | |
2996 | return i; | |
2997 | if (partition >= ST_NBR_PARTITIONS) | |
2998 | return (-EIO); | |
2999 | return partition; | |
3000 | } | |
3001 | ||
3002 | ||
3003 | /* Change the partition if necessary */ | |
3004 | static int switch_partition(struct scsi_tape *STp) | |
3005 | { | |
3006 | struct st_partstat *STps; | |
3007 | ||
3008 | if (STp->partition == STp->new_partition) | |
3009 | return 0; | |
3010 | STps = &(STp->ps[STp->new_partition]); | |
3011 | if (!STps->last_block_valid) | |
3012 | STps->last_block_visited = 0; | |
3013 | return set_location(STp, STps->last_block_visited, STp->new_partition, 1); | |
3014 | } | |
3015 | \f | |
3016 | /* Functions for reading and writing the medium partition mode page. */ | |
3017 | ||
3018 | #define PART_PAGE 0x11 | |
3019 | #define PART_PAGE_FIXED_LENGTH 8 | |
3020 | ||
3021 | #define PP_OFF_MAX_ADD_PARTS 2 | |
3022 | #define PP_OFF_NBR_ADD_PARTS 3 | |
3023 | #define PP_OFF_FLAGS 4 | |
3024 | #define PP_OFF_PART_UNITS 6 | |
3025 | #define PP_OFF_RESERVED 7 | |
3026 | ||
3027 | #define PP_BIT_IDP 0x20 | |
3028 | #define PP_MSK_PSUM_MB 0x10 | |
3029 | ||
3030 | /* Get the number of partitions on the tape. As a side effect reads the | |
3031 | mode page into the tape buffer. */ | |
3032 | static int nbr_partitions(struct scsi_tape *STp) | |
3033 | { | |
3034 | int result; | |
3035 | DEB( char *name = tape_name(STp); ) | |
3036 | ||
3037 | if (STp->ready != ST_READY) | |
3038 | return (-EIO); | |
3039 | ||
3040 | result = read_mode_page(STp, PART_PAGE, 1); | |
3041 | ||
3042 | if (result) { | |
3043 | DEBC(printk(ST_DEB_MSG "%s: Can't read medium partition page.\n", | |
3044 | name)); | |
3045 | result = (-EIO); | |
3046 | } else { | |
3047 | result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + | |
3048 | PP_OFF_NBR_ADD_PARTS] + 1; | |
3049 | DEBC(printk(ST_DEB_MSG "%s: Number of partitions %d.\n", name, result)); | |
3050 | } | |
3051 | ||
3052 | return result; | |
3053 | } | |
3054 | ||
3055 | ||
3056 | /* Partition the tape into two partitions if size > 0 or one partition if | |
3057 | size == 0. | |
3058 | ||
3059 | The block descriptors are read and written because Sony SDT-7000 does not | |
3060 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). | |
3061 | ||
3062 | My HP C1533A drive returns only one partition size field. This is used to | |
3063 | set the size of partition 1. There is no size field for the default partition. | |
3064 | Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is | |
3065 | used to set the size of partition 1 (this is what the SCSI-3 standard specifies). | |
3066 | The following algorithm is used to accommodate both drives: if the number of | |
3067 | partition size fields is greater than the maximum number of additional partitions | |
3068 | in the mode page, the second field is used. Otherwise the first field is used. | |
3069 | ||
3070 | For Seagate DDS drives the page length must be 8 when no partitions is defined | |
3071 | and 10 when 1 partition is defined (information from Eric Lee Green). This is | |
3072 | is acceptable also to some other old drives and enforced if the first partition | |
3073 | size field is used for the first additional partition size. | |
3074 | */ | |
3075 | static int partition_tape(struct scsi_tape *STp, int size) | |
3076 | { | |
3077 | char *name = tape_name(STp); | |
3078 | int result; | |
3079 | int pgo, psd_cnt, psdo; | |
3080 | unsigned char *bp; | |
3081 | ||
3082 | result = read_mode_page(STp, PART_PAGE, 0); | |
3083 | if (result) { | |
3084 | DEBC(printk(ST_DEB_MSG "%s: Can't read partition mode page.\n", name)); | |
3085 | return result; | |
3086 | } | |
3087 | /* The mode page is in the buffer. Let's modify it and write it. */ | |
3088 | bp = (STp->buffer)->b_data; | |
3089 | pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; | |
3090 | DEBC(printk(ST_DEB_MSG "%s: Partition page length is %d bytes.\n", | |
3091 | name, bp[pgo + MP_OFF_PAGE_LENGTH] + 2)); | |
3092 | ||
3093 | psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; | |
3094 | psdo = pgo + PART_PAGE_FIXED_LENGTH; | |
3095 | if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) { | |
3096 | bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */ | |
3097 | psdo += 2; | |
3098 | } | |
3099 | memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); | |
3100 | ||
3101 | DEBC(printk("%s: psd_cnt %d, max.parts %d, nbr_parts %d\n", name, | |
3102 | psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], | |
3103 | bp[pgo + PP_OFF_NBR_ADD_PARTS])); | |
3104 | ||
3105 | if (size <= 0) { | |
3106 | bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; | |
3107 | if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) | |
3108 | bp[pgo + MP_OFF_PAGE_LENGTH] = 6; | |
3109 | DEBC(printk(ST_DEB_MSG "%s: Formatting tape with one partition.\n", | |
3110 | name)); | |
3111 | } else { | |
3112 | bp[psdo] = (size >> 8) & 0xff; | |
3113 | bp[psdo + 1] = size & 0xff; | |
3114 | bp[pgo + 3] = 1; | |
3115 | if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) | |
3116 | bp[pgo + MP_OFF_PAGE_LENGTH] = 8; | |
3117 | DEBC(printk(ST_DEB_MSG | |
3118 | "%s: Formatting tape with two partitions (1 = %d MB).\n", | |
3119 | name, size)); | |
3120 | } | |
3121 | bp[pgo + PP_OFF_PART_UNITS] = 0; | |
3122 | bp[pgo + PP_OFF_RESERVED] = 0; | |
3123 | bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB; | |
3124 | ||
3125 | result = write_mode_page(STp, PART_PAGE, 1); | |
3126 | if (result) { | |
3127 | printk(KERN_INFO "%s: Partitioning of tape failed.\n", name); | |
3128 | result = (-EIO); | |
3129 | } | |
3130 | ||
3131 | return result; | |
3132 | } | |
3133 | \f | |
3134 | ||
3135 | ||
3136 | /* The ioctl command */ | |
3137 | static int st_ioctl(struct inode *inode, struct file *file, | |
3138 | unsigned int cmd_in, unsigned long arg) | |
3139 | { | |
3140 | int i, cmd_nr, cmd_type, bt; | |
3141 | int retval = 0; | |
3142 | unsigned int blk; | |
3143 | struct scsi_tape *STp = file->private_data; | |
3144 | struct st_modedef *STm; | |
3145 | struct st_partstat *STps; | |
3146 | char *name = tape_name(STp); | |
3147 | void __user *p = (void __user *)arg; | |
3148 | ||
3149 | if (down_interruptible(&STp->lock)) | |
3150 | return -ERESTARTSYS; | |
3151 | ||
3152 | DEB( | |
3153 | if (debugging && !STp->in_use) { | |
3154 | printk(ST_DEB_MSG "%s: Incorrect device.\n", name); | |
3155 | retval = (-EIO); | |
3156 | goto out; | |
3157 | } ) /* end DEB */ | |
3158 | ||
3159 | STm = &(STp->modes[STp->current_mode]); | |
3160 | STps = &(STp->ps[STp->partition]); | |
3161 | ||
3162 | /* | |
3163 | * If we are in the middle of error recovery, don't let anyone | |
3164 | * else try and use this device. Also, if error recovery fails, it | |
3165 | * may try and take the device offline, in which case all further | |
3166 | * access to the device is prohibited. | |
3167 | */ | |
3168 | retval = scsi_nonblockable_ioctl(STp->device, cmd_in, p, file); | |
3169 | if (!scsi_block_when_processing_errors(STp->device) || retval != -ENODEV) | |
3170 | goto out; | |
3171 | retval = 0; | |
3172 | ||
3173 | cmd_type = _IOC_TYPE(cmd_in); | |
3174 | cmd_nr = _IOC_NR(cmd_in); | |
3175 | ||
3176 | if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { | |
3177 | struct mtop mtc; | |
3178 | ||
3179 | if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { | |
3180 | retval = (-EINVAL); | |
3181 | goto out; | |
3182 | } | |
3183 | ||
3184 | i = copy_from_user(&mtc, p, sizeof(struct mtop)); | |
3185 | if (i) { | |
3186 | retval = (-EFAULT); | |
3187 | goto out; | |
3188 | } | |
3189 | ||
3190 | if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { | |
3191 | printk(KERN_WARNING | |
3192 | "%s: MTSETDRVBUFFER only allowed for root.\n", name); | |
3193 | retval = (-EPERM); | |
3194 | goto out; | |
3195 | } | |
3196 | if (!STm->defined && | |
3197 | (mtc.mt_op != MTSETDRVBUFFER && | |
3198 | (mtc.mt_count & MT_ST_OPTIONS) == 0)) { | |
3199 | retval = (-ENXIO); | |
3200 | goto out; | |
3201 | } | |
3202 | ||
3203 | if (!STp->pos_unknown) { | |
3204 | ||
3205 | if (STps->eof == ST_FM_HIT) { | |
3206 | if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || | |
3207 | mtc.mt_op == MTEOM) { | |
3208 | mtc.mt_count -= 1; | |
3209 | if (STps->drv_file >= 0) | |
3210 | STps->drv_file += 1; | |
3211 | } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { | |
3212 | mtc.mt_count += 1; | |
3213 | if (STps->drv_file >= 0) | |
3214 | STps->drv_file += 1; | |
3215 | } | |
3216 | } | |
3217 | ||
3218 | if (mtc.mt_op == MTSEEK) { | |
3219 | /* Old position must be restored if partition will be | |
3220 | changed */ | |
3221 | i = !STp->can_partitions || | |
3222 | (STp->new_partition != STp->partition); | |
3223 | } else { | |
3224 | i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || | |
3225 | mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || | |
3226 | mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || | |
3227 | mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || | |
3228 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || | |
3229 | mtc.mt_op == MTCOMPRESSION; | |
3230 | } | |
3231 | i = flush_buffer(STp, i); | |
3232 | if (i < 0) { | |
3233 | retval = i; | |
3234 | goto out; | |
3235 | } | |
3236 | if (STps->rw == ST_WRITING && | |
3237 | (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || | |
3238 | mtc.mt_op == MTSEEK || | |
3239 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { | |
3240 | i = st_int_ioctl(STp, MTWEOF, 1); | |
3241 | if (i < 0) { | |
3242 | retval = i; | |
3243 | goto out; | |
3244 | } | |
3245 | if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) | |
3246 | mtc.mt_count++; | |
3247 | STps->rw = ST_IDLE; | |
3248 | } | |
3249 | ||
3250 | } else { | |
3251 | /* | |
3252 | * If there was a bus reset, block further access | |
3253 | * to this device. If the user wants to rewind the tape, | |
3254 | * then reset the flag and allow access again. | |
3255 | */ | |
3256 | if (mtc.mt_op != MTREW && | |
3257 | mtc.mt_op != MTOFFL && | |
3258 | mtc.mt_op != MTRETEN && | |
3259 | mtc.mt_op != MTERASE && | |
3260 | mtc.mt_op != MTSEEK && | |
3261 | mtc.mt_op != MTEOM) { | |
3262 | retval = (-EIO); | |
3263 | goto out; | |
3264 | } | |
3265 | reset_state(STp); | |
3266 | /* remove this when the midlevel properly clears was_reset */ | |
3267 | STp->device->was_reset = 0; | |
3268 | } | |
3269 | ||
3270 | if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && | |
3271 | mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && | |
3272 | mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) | |
3273 | STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ | |
3274 | ||
3275 | if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) | |
3276 | do_door_lock(STp, 0); /* Ignore result! */ | |
3277 | ||
3278 | if (mtc.mt_op == MTSETDRVBUFFER && | |
3279 | (mtc.mt_count & MT_ST_OPTIONS) != 0) { | |
3280 | retval = st_set_options(STp, mtc.mt_count); | |
3281 | goto out; | |
3282 | } | |
3283 | ||
3284 | if (mtc.mt_op == MTSETPART) { | |
3285 | if (!STp->can_partitions || | |
3286 | mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { | |
3287 | retval = (-EINVAL); | |
3288 | goto out; | |
3289 | } | |
3290 | if (mtc.mt_count >= STp->nbr_partitions && | |
3291 | (STp->nbr_partitions = nbr_partitions(STp)) < 0) { | |
3292 | retval = (-EIO); | |
3293 | goto out; | |
3294 | } | |
3295 | if (mtc.mt_count >= STp->nbr_partitions) { | |
3296 | retval = (-EINVAL); | |
3297 | goto out; | |
3298 | } | |
3299 | STp->new_partition = mtc.mt_count; | |
3300 | retval = 0; | |
3301 | goto out; | |
3302 | } | |
3303 | ||
3304 | if (mtc.mt_op == MTMKPART) { | |
3305 | if (!STp->can_partitions) { | |
3306 | retval = (-EINVAL); | |
3307 | goto out; | |
3308 | } | |
3309 | if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 || | |
3310 | (i = partition_tape(STp, mtc.mt_count)) < 0) { | |
3311 | retval = i; | |
3312 | goto out; | |
3313 | } | |
3314 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
3315 | STp->ps[i].rw = ST_IDLE; | |
3316 | STp->ps[i].at_sm = 0; | |
3317 | STp->ps[i].last_block_valid = 0; | |
3318 | } | |
3319 | STp->partition = STp->new_partition = 0; | |
3320 | STp->nbr_partitions = 1; /* Bad guess ?-) */ | |
3321 | STps->drv_block = STps->drv_file = 0; | |
3322 | retval = 0; | |
3323 | goto out; | |
3324 | } | |
3325 | ||
3326 | if (mtc.mt_op == MTSEEK) { | |
3327 | i = set_location(STp, mtc.mt_count, STp->new_partition, 0); | |
3328 | if (!STp->can_partitions) | |
3329 | STp->ps[0].rw = ST_IDLE; | |
3330 | retval = i; | |
3331 | goto out; | |
3332 | } | |
3333 | ||
3334 | if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { | |
3335 | retval = do_load_unload(STp, file, 0); | |
3336 | goto out; | |
3337 | } | |
3338 | ||
3339 | if (mtc.mt_op == MTLOAD) { | |
3340 | retval = do_load_unload(STp, file, max(1, mtc.mt_count)); | |
3341 | goto out; | |
3342 | } | |
3343 | ||
3344 | if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { | |
3345 | retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); | |
3346 | goto out; | |
3347 | } | |
3348 | ||
3349 | if (STp->can_partitions && STp->ready == ST_READY && | |
3350 | (i = switch_partition(STp)) < 0) { | |
3351 | retval = i; | |
3352 | goto out; | |
3353 | } | |
3354 | ||
3355 | if (mtc.mt_op == MTCOMPRESSION) | |
3356 | retval = st_compression(STp, (mtc.mt_count & 1)); | |
3357 | else | |
3358 | retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); | |
3359 | goto out; | |
3360 | } | |
3361 | if (!STm->defined) { | |
3362 | retval = (-ENXIO); | |
3363 | goto out; | |
3364 | } | |
3365 | ||
3366 | if ((i = flush_buffer(STp, 0)) < 0) { | |
3367 | retval = i; | |
3368 | goto out; | |
3369 | } | |
3370 | if (STp->can_partitions && | |
3371 | (i = switch_partition(STp)) < 0) { | |
3372 | retval = i; | |
3373 | goto out; | |
3374 | } | |
3375 | ||
3376 | if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { | |
3377 | struct mtget mt_status; | |
3378 | ||
3379 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { | |
3380 | retval = (-EINVAL); | |
3381 | goto out; | |
3382 | } | |
3383 | ||
3384 | mt_status.mt_type = STp->tape_type; | |
3385 | mt_status.mt_dsreg = | |
3386 | ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | | |
3387 | ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); | |
3388 | mt_status.mt_blkno = STps->drv_block; | |
3389 | mt_status.mt_fileno = STps->drv_file; | |
3390 | if (STp->block_size != 0) { | |
3391 | if (STps->rw == ST_WRITING) | |
3392 | mt_status.mt_blkno += | |
3393 | (STp->buffer)->buffer_bytes / STp->block_size; | |
3394 | else if (STps->rw == ST_READING) | |
3395 | mt_status.mt_blkno -= | |
3396 | ((STp->buffer)->buffer_bytes + | |
3397 | STp->block_size - 1) / STp->block_size; | |
3398 | } | |
3399 | ||
3400 | mt_status.mt_gstat = 0; | |
3401 | if (STp->drv_write_prot) | |
3402 | mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
3403 | if (mt_status.mt_blkno == 0) { | |
3404 | if (mt_status.mt_fileno == 0) | |
3405 | mt_status.mt_gstat |= GMT_BOT(0xffffffff); | |
3406 | else | |
3407 | mt_status.mt_gstat |= GMT_EOF(0xffffffff); | |
3408 | } | |
3409 | mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); | |
3410 | mt_status.mt_resid = STp->partition; | |
3411 | if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) | |
3412 | mt_status.mt_gstat |= GMT_EOT(0xffffffff); | |
3413 | else if (STps->eof >= ST_EOM_OK) | |
3414 | mt_status.mt_gstat |= GMT_EOD(0xffffffff); | |
3415 | if (STp->density == 1) | |
3416 | mt_status.mt_gstat |= GMT_D_800(0xffffffff); | |
3417 | else if (STp->density == 2) | |
3418 | mt_status.mt_gstat |= GMT_D_1600(0xffffffff); | |
3419 | else if (STp->density == 3) | |
3420 | mt_status.mt_gstat |= GMT_D_6250(0xffffffff); | |
3421 | if (STp->ready == ST_READY) | |
3422 | mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); | |
3423 | if (STp->ready == ST_NO_TAPE) | |
3424 | mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); | |
3425 | if (STps->at_sm) | |
3426 | mt_status.mt_gstat |= GMT_SM(0xffffffff); | |
3427 | if (STm->do_async_writes || | |
3428 | (STm->do_buffer_writes && STp->block_size != 0) || | |
3429 | STp->drv_buffer != 0) | |
3430 | mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); | |
3431 | if (STp->cleaning_req) | |
3432 | mt_status.mt_gstat |= GMT_CLN(0xffffffff); | |
3433 | ||
3434 | i = copy_to_user(p, &mt_status, sizeof(struct mtget)); | |
3435 | if (i) { | |
3436 | retval = (-EFAULT); | |
3437 | goto out; | |
3438 | } | |
3439 | ||
3440 | STp->recover_reg = 0; /* Clear after read */ | |
3441 | retval = 0; | |
3442 | goto out; | |
3443 | } /* End of MTIOCGET */ | |
3444 | if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { | |
3445 | struct mtpos mt_pos; | |
3446 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { | |
3447 | retval = (-EINVAL); | |
3448 | goto out; | |
3449 | } | |
3450 | if ((i = get_location(STp, &blk, &bt, 0)) < 0) { | |
3451 | retval = i; | |
3452 | goto out; | |
3453 | } | |
3454 | mt_pos.mt_blkno = blk; | |
3455 | i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); | |
3456 | if (i) | |
3457 | retval = (-EFAULT); | |
3458 | goto out; | |
3459 | } | |
3460 | up(&STp->lock); | |
3461 | switch (cmd_in) { | |
3462 | case SCSI_IOCTL_GET_IDLUN: | |
3463 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
3464 | break; | |
3465 | default: | |
3466 | if (!capable(CAP_SYS_ADMIN)) | |
3467 | i = -EPERM; | |
3468 | else | |
3469 | i = scsi_cmd_ioctl(file, STp->disk, cmd_in, p); | |
3470 | if (i != -ENOTTY) | |
3471 | return i; | |
3472 | break; | |
3473 | } | |
3474 | if (!capable(CAP_SYS_ADMIN) && | |
3475 | (cmd_in == SCSI_IOCTL_START_UNIT || cmd_in == SCSI_IOCTL_STOP_UNIT)) | |
3476 | return -EPERM; | |
3477 | return scsi_ioctl(STp->device, cmd_in, p); | |
3478 | ||
3479 | out: | |
3480 | up(&STp->lock); | |
3481 | return retval; | |
3482 | } | |
3483 | ||
3484 | #ifdef CONFIG_COMPAT | |
3485 | static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
3486 | { | |
3487 | struct scsi_tape *STp = file->private_data; | |
3488 | struct scsi_device *sdev = STp->device; | |
3489 | int ret = -ENOIOCTLCMD; | |
3490 | if (sdev->host->hostt->compat_ioctl) { | |
3491 | ||
3492 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); | |
3493 | ||
3494 | } | |
3495 | return ret; | |
3496 | } | |
3497 | #endif | |
3498 | ||
3499 | \f | |
3500 | ||
3501 | /* Try to allocate a new tape buffer. Calling function must not hold | |
3502 | dev_arr_lock. */ | |
3503 | static struct st_buffer * | |
3504 | new_tape_buffer(int from_initialization, int need_dma, int max_sg) | |
3505 | { | |
3506 | int i, priority, got = 0, segs = 0; | |
3507 | struct st_buffer *tb; | |
3508 | ||
3509 | if (from_initialization) | |
3510 | priority = GFP_ATOMIC; | |
3511 | else | |
3512 | priority = GFP_KERNEL; | |
3513 | ||
3514 | i = sizeof(struct st_buffer) + (max_sg - 1) * sizeof(struct scatterlist) + | |
3515 | max_sg * sizeof(struct st_buf_fragment); | |
3516 | tb = kmalloc(i, priority); | |
3517 | if (!tb) { | |
3518 | printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); | |
3519 | return NULL; | |
3520 | } | |
3521 | memset(tb, 0, i); | |
3522 | tb->frp_segs = tb->orig_frp_segs = segs; | |
3523 | tb->use_sg = max_sg; | |
3524 | if (segs > 0) | |
3525 | tb->b_data = page_address(tb->sg[0].page); | |
3526 | tb->frp = (struct st_buf_fragment *)(&(tb->sg[0]) + max_sg); | |
3527 | ||
3528 | tb->in_use = 1; | |
3529 | tb->dma = need_dma; | |
3530 | tb->buffer_size = got; | |
3531 | ||
3532 | return tb; | |
3533 | } | |
3534 | ||
3535 | ||
3536 | /* Try to allocate enough space in the tape buffer */ | |
3537 | static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) | |
3538 | { | |
3539 | int segs, nbr, max_segs, b_size, priority, order, got; | |
3540 | ||
3541 | if (new_size <= STbuffer->buffer_size) | |
3542 | return 1; | |
3543 | ||
3544 | if (STbuffer->buffer_size <= PAGE_SIZE) | |
3545 | normalize_buffer(STbuffer); /* Avoid extra segment */ | |
3546 | ||
3547 | max_segs = STbuffer->use_sg; | |
3548 | nbr = max_segs - STbuffer->frp_segs; | |
3549 | if (nbr <= 0) | |
3550 | return 0; | |
3551 | ||
3552 | priority = GFP_KERNEL | __GFP_NOWARN; | |
3553 | if (need_dma) | |
3554 | priority |= GFP_DMA; | |
3555 | for (b_size = PAGE_SIZE, order=0; | |
3556 | b_size < new_size - STbuffer->buffer_size; | |
3557 | order++, b_size *= 2) | |
3558 | ; /* empty */ | |
3559 | ||
3560 | for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; | |
3561 | segs < max_segs && got < new_size;) { | |
3562 | STbuffer->frp[segs].page = alloc_pages(priority, order); | |
3563 | if (STbuffer->frp[segs].page == NULL) { | |
3564 | if (new_size - got <= (max_segs - segs) * b_size / 2) { | |
3565 | b_size /= 2; /* Large enough for the rest of the buffers */ | |
3566 | order--; | |
3567 | continue; | |
3568 | } | |
3569 | DEB(STbuffer->buffer_size = got); | |
3570 | normalize_buffer(STbuffer); | |
3571 | return 0; | |
3572 | } | |
3573 | STbuffer->frp[segs].length = b_size; | |
3574 | STbuffer->frp_segs += 1; | |
3575 | got += b_size; | |
3576 | STbuffer->buffer_size = got; | |
3577 | segs++; | |
3578 | } | |
3579 | STbuffer->b_data = page_address(STbuffer->frp[0].page); | |
3580 | ||
3581 | return 1; | |
3582 | } | |
3583 | ||
3584 | ||
3585 | /* Release the extra buffer */ | |
3586 | static void normalize_buffer(struct st_buffer * STbuffer) | |
3587 | { | |
3588 | int i, order; | |
3589 | ||
3590 | for (i = STbuffer->orig_frp_segs; i < STbuffer->frp_segs; i++) { | |
3591 | order = get_order(STbuffer->frp[i].length); | |
3592 | __free_pages(STbuffer->frp[i].page, order); | |
3593 | STbuffer->buffer_size -= STbuffer->frp[i].length; | |
3594 | } | |
3595 | STbuffer->frp_segs = STbuffer->orig_frp_segs; | |
3596 | STbuffer->frp_sg_current = 0; | |
3597 | } | |
3598 | ||
3599 | ||
3600 | /* Move data from the user buffer to the tape buffer. Returns zero (success) or | |
3601 | negative error code. */ | |
3602 | static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) | |
3603 | { | |
3604 | int i, cnt, res, offset; | |
3605 | ||
3606 | for (i = 0, offset = st_bp->buffer_bytes; | |
3607 | i < st_bp->frp_segs && offset >= st_bp->frp[i].length; i++) | |
3608 | offset -= st_bp->frp[i].length; | |
3609 | if (i == st_bp->frp_segs) { /* Should never happen */ | |
3610 | printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); | |
3611 | return (-EIO); | |
3612 | } | |
3613 | for (; i < st_bp->frp_segs && do_count > 0; i++) { | |
3614 | cnt = st_bp->frp[i].length - offset < do_count ? | |
3615 | st_bp->frp[i].length - offset : do_count; | |
3616 | res = copy_from_user(page_address(st_bp->frp[i].page) + offset, ubp, cnt); | |
3617 | if (res) | |
3618 | return (-EFAULT); | |
3619 | do_count -= cnt; | |
3620 | st_bp->buffer_bytes += cnt; | |
3621 | ubp += cnt; | |
3622 | offset = 0; | |
3623 | } | |
3624 | if (do_count) /* Should never happen */ | |
3625 | return (-EIO); | |
3626 | ||
3627 | return 0; | |
3628 | } | |
3629 | ||
3630 | ||
3631 | /* Move data from the tape buffer to the user buffer. Returns zero (success) or | |
3632 | negative error code. */ | |
3633 | static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) | |
3634 | { | |
3635 | int i, cnt, res, offset; | |
3636 | ||
3637 | for (i = 0, offset = st_bp->read_pointer; | |
3638 | i < st_bp->frp_segs && offset >= st_bp->frp[i].length; i++) | |
3639 | offset -= st_bp->frp[i].length; | |
3640 | if (i == st_bp->frp_segs) { /* Should never happen */ | |
3641 | printk(KERN_WARNING "st: from_buffer offset overflow.\n"); | |
3642 | return (-EIO); | |
3643 | } | |
3644 | for (; i < st_bp->frp_segs && do_count > 0; i++) { | |
3645 | cnt = st_bp->frp[i].length - offset < do_count ? | |
3646 | st_bp->frp[i].length - offset : do_count; | |
3647 | res = copy_to_user(ubp, page_address(st_bp->frp[i].page) + offset, cnt); | |
3648 | if (res) | |
3649 | return (-EFAULT); | |
3650 | do_count -= cnt; | |
3651 | st_bp->buffer_bytes -= cnt; | |
3652 | st_bp->read_pointer += cnt; | |
3653 | ubp += cnt; | |
3654 | offset = 0; | |
3655 | } | |
3656 | if (do_count) /* Should never happen */ | |
3657 | return (-EIO); | |
3658 | ||
3659 | return 0; | |
3660 | } | |
3661 | ||
3662 | ||
3663 | /* Move data towards start of buffer */ | |
3664 | static void move_buffer_data(struct st_buffer * st_bp, int offset) | |
3665 | { | |
3666 | int src_seg, dst_seg, src_offset = 0, dst_offset; | |
3667 | int count, total; | |
3668 | ||
3669 | if (offset == 0) | |
3670 | return; | |
3671 | ||
3672 | total=st_bp->buffer_bytes - offset; | |
3673 | for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { | |
3674 | src_offset = offset; | |
3675 | if (src_offset < st_bp->frp[src_seg].length) | |
3676 | break; | |
3677 | offset -= st_bp->frp[src_seg].length; | |
3678 | } | |
3679 | ||
3680 | st_bp->buffer_bytes = st_bp->read_pointer = total; | |
3681 | for (dst_seg=dst_offset=0; total > 0; ) { | |
3682 | count = min(st_bp->frp[dst_seg].length - dst_offset, | |
3683 | st_bp->frp[src_seg].length - src_offset); | |
3684 | memmove(page_address(st_bp->frp[dst_seg].page) + dst_offset, | |
3685 | page_address(st_bp->frp[src_seg].page) + src_offset, count); | |
3686 | src_offset += count; | |
3687 | if (src_offset >= st_bp->frp[src_seg].length) { | |
3688 | src_seg++; | |
3689 | src_offset = 0; | |
3690 | } | |
3691 | dst_offset += count; | |
3692 | if (dst_offset >= st_bp->frp[dst_seg].length) { | |
3693 | dst_seg++; | |
3694 | dst_offset = 0; | |
3695 | } | |
3696 | total -= count; | |
3697 | } | |
3698 | } | |
3699 | ||
3700 | ||
3701 | /* Fill the s/g list up to the length required for this transfer */ | |
3702 | static void buf_to_sg(struct st_buffer *STbp, unsigned int length) | |
3703 | { | |
3704 | int i; | |
3705 | unsigned int count; | |
3706 | struct scatterlist *sg; | |
3707 | struct st_buf_fragment *frp; | |
3708 | ||
3709 | if (length == STbp->frp_sg_current) | |
3710 | return; /* work already done */ | |
3711 | ||
3712 | sg = &(STbp->sg[0]); | |
3713 | frp = STbp->frp; | |
3714 | for (i=count=0; count < length; i++) { | |
3715 | sg[i].page = frp[i].page; | |
3716 | if (length - count > frp[i].length) | |
3717 | sg[i].length = frp[i].length; | |
3718 | else | |
3719 | sg[i].length = length - count; | |
3720 | count += sg[i].length; | |
3721 | sg[i].offset = 0; | |
3722 | } | |
3723 | STbp->sg_segs = i; | |
3724 | STbp->frp_sg_current = length; | |
3725 | } | |
3726 | ||
3727 | ||
3728 | /* Validate the options from command line or module parameters */ | |
3729 | static void validate_options(void) | |
3730 | { | |
3731 | if (buffer_kbs > 0) | |
3732 | st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; | |
3733 | if (max_sg_segs >= ST_FIRST_SG) | |
3734 | st_max_sg_segs = max_sg_segs; | |
3735 | } | |
3736 | ||
3737 | #ifndef MODULE | |
3738 | /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. | |
3739 | */ | |
3740 | static int __init st_setup(char *str) | |
3741 | { | |
3742 | int i, len, ints[5]; | |
3743 | char *stp; | |
3744 | ||
3745 | stp = get_options(str, ARRAY_SIZE(ints), ints); | |
3746 | ||
3747 | if (ints[0] > 0) { | |
3748 | for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) | |
3749 | if (parms[i].val) | |
3750 | *parms[i].val = ints[i + 1]; | |
3751 | } else { | |
3752 | while (stp != NULL) { | |
3753 | for (i = 0; i < ARRAY_SIZE(parms); i++) { | |
3754 | len = strlen(parms[i].name); | |
3755 | if (!strncmp(stp, parms[i].name, len) && | |
3756 | (*(stp + len) == ':' || *(stp + len) == '=')) { | |
3757 | if (parms[i].val) | |
3758 | *parms[i].val = | |
3759 | simple_strtoul(stp + len + 1, NULL, 0); | |
3760 | else | |
3761 | printk(KERN_WARNING "st: Obsolete parameter %s\n", | |
3762 | parms[i].name); | |
3763 | break; | |
3764 | } | |
3765 | } | |
3766 | if (i >= sizeof(parms) / sizeof(struct st_dev_parm)) | |
3767 | printk(KERN_WARNING "st: invalid parameter in '%s'\n", | |
3768 | stp); | |
3769 | stp = strchr(stp, ','); | |
3770 | if (stp) | |
3771 | stp++; | |
3772 | } | |
3773 | } | |
3774 | ||
3775 | validate_options(); | |
3776 | ||
3777 | return 1; | |
3778 | } | |
3779 | ||
3780 | __setup("st=", st_setup); | |
3781 | ||
3782 | #endif | |
3783 | ||
3784 | static struct file_operations st_fops = | |
3785 | { | |
3786 | .owner = THIS_MODULE, | |
3787 | .read = st_read, | |
3788 | .write = st_write, | |
3789 | .ioctl = st_ioctl, | |
3790 | #ifdef CONFIG_COMPAT | |
3791 | .compat_ioctl = st_compat_ioctl, | |
3792 | #endif | |
3793 | .open = st_open, | |
3794 | .flush = st_flush, | |
3795 | .release = st_release, | |
3796 | }; | |
3797 | ||
3798 | static int st_probe(struct device *dev) | |
3799 | { | |
3800 | struct scsi_device *SDp = to_scsi_device(dev); | |
3801 | struct gendisk *disk = NULL; | |
3802 | struct cdev *cdev = NULL; | |
3803 | struct scsi_tape *tpnt = NULL; | |
3804 | struct st_modedef *STm; | |
3805 | struct st_partstat *STps; | |
3806 | struct st_buffer *buffer; | |
3807 | int i, j, mode, dev_num, error; | |
3808 | char *stp; | |
3809 | u64 bounce_limit; | |
3810 | ||
3811 | if (SDp->type != TYPE_TAPE) | |
3812 | return -ENODEV; | |
3813 | if ((stp = st_incompatible(SDp))) { | |
3814 | printk(KERN_INFO | |
3815 | "st: Found incompatible tape at scsi%d, channel %d, id %d, lun %d\n", | |
3816 | SDp->host->host_no, SDp->channel, SDp->id, SDp->lun); | |
3817 | printk(KERN_INFO "st: The suggested driver is %s.\n", stp); | |
3818 | return -ENODEV; | |
3819 | } | |
3820 | ||
3821 | i = SDp->host->sg_tablesize; | |
3822 | if (st_max_sg_segs < i) | |
3823 | i = st_max_sg_segs; | |
3824 | buffer = new_tape_buffer(1, (SDp->host)->unchecked_isa_dma, i); | |
3825 | if (buffer == NULL) { | |
3826 | printk(KERN_ERR | |
3827 | "st: Can't allocate new tape buffer. Device not attached.\n"); | |
3828 | goto out; | |
3829 | } | |
3830 | ||
3831 | disk = alloc_disk(1); | |
3832 | if (!disk) { | |
3833 | printk(KERN_ERR "st: out of memory. Device not attached.\n"); | |
3834 | goto out_buffer_free; | |
3835 | } | |
3836 | ||
3837 | write_lock(&st_dev_arr_lock); | |
3838 | if (st_nr_dev >= st_dev_max) { | |
3839 | struct scsi_tape **tmp_da; | |
3840 | int tmp_dev_max; | |
3841 | ||
3842 | tmp_dev_max = max(st_nr_dev * 2, 8); | |
3843 | if (tmp_dev_max > ST_MAX_TAPES) | |
3844 | tmp_dev_max = ST_MAX_TAPES; | |
3845 | if (tmp_dev_max <= st_nr_dev) { | |
3846 | write_unlock(&st_dev_arr_lock); | |
3847 | printk(KERN_ERR "st: Too many tape devices (max. %d).\n", | |
3848 | ST_MAX_TAPES); | |
3849 | goto out_put_disk; | |
3850 | } | |
3851 | ||
3852 | tmp_da = kmalloc(tmp_dev_max * sizeof(struct scsi_tape *), GFP_ATOMIC); | |
3853 | if (tmp_da == NULL) { | |
3854 | write_unlock(&st_dev_arr_lock); | |
3855 | printk(KERN_ERR "st: Can't extend device array.\n"); | |
3856 | goto out_put_disk; | |
3857 | } | |
3858 | ||
3859 | memset(tmp_da, 0, tmp_dev_max * sizeof(struct scsi_tape *)); | |
3860 | if (scsi_tapes != NULL) { | |
3861 | memcpy(tmp_da, scsi_tapes, | |
3862 | st_dev_max * sizeof(struct scsi_tape *)); | |
3863 | kfree(scsi_tapes); | |
3864 | } | |
3865 | scsi_tapes = tmp_da; | |
3866 | ||
3867 | st_dev_max = tmp_dev_max; | |
3868 | } | |
3869 | ||
3870 | for (i = 0; i < st_dev_max; i++) | |
3871 | if (scsi_tapes[i] == NULL) | |
3872 | break; | |
3873 | if (i >= st_dev_max) | |
3874 | panic("scsi_devices corrupt (st)"); | |
3875 | ||
3876 | tpnt = kmalloc(sizeof(struct scsi_tape), GFP_ATOMIC); | |
3877 | if (tpnt == NULL) { | |
3878 | write_unlock(&st_dev_arr_lock); | |
3879 | printk(KERN_ERR "st: Can't allocate device descriptor.\n"); | |
3880 | goto out_put_disk; | |
3881 | } | |
3882 | memset(tpnt, 0, sizeof(struct scsi_tape)); | |
3883 | tpnt->disk = disk; | |
3884 | sprintf(disk->disk_name, "st%d", i); | |
3885 | disk->private_data = &tpnt->driver; | |
3886 | disk->queue = SDp->request_queue; | |
3887 | tpnt->driver = &st_template; | |
3888 | scsi_tapes[i] = tpnt; | |
3889 | dev_num = i; | |
3890 | ||
3891 | tpnt->device = SDp; | |
3892 | if (SDp->scsi_level <= 2) | |
3893 | tpnt->tape_type = MT_ISSCSI1; | |
3894 | else | |
3895 | tpnt->tape_type = MT_ISSCSI2; | |
3896 | ||
3897 | tpnt->buffer = buffer; | |
3898 | ||
3899 | tpnt->inited = 0; | |
3900 | tpnt->dirty = 0; | |
3901 | tpnt->in_use = 0; | |
3902 | tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ | |
3903 | tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; | |
3904 | tpnt->use_pf = (SDp->scsi_level >= SCSI_2); | |
3905 | tpnt->density = 0; | |
3906 | tpnt->do_auto_lock = ST_AUTO_LOCK; | |
3907 | tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ | |
3908 | tpnt->can_partitions = 0; | |
3909 | tpnt->two_fm = ST_TWO_FM; | |
3910 | tpnt->fast_mteom = ST_FAST_MTEOM; | |
3911 | tpnt->scsi2_logical = ST_SCSI2LOGICAL; | |
3912 | tpnt->immediate = ST_NOWAIT; | |
3913 | tpnt->default_drvbuffer = 0xff; /* No forced buffering */ | |
3914 | tpnt->partition = 0; | |
3915 | tpnt->new_partition = 0; | |
3916 | tpnt->nbr_partitions = 0; | |
3917 | tpnt->device->timeout = ST_TIMEOUT; | |
3918 | tpnt->long_timeout = ST_LONG_TIMEOUT; | |
3919 | tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; | |
3920 | ||
3921 | bounce_limit = scsi_calculate_bounce_limit(SDp->host) >> PAGE_SHIFT; | |
3922 | if (bounce_limit > ULONG_MAX) | |
3923 | bounce_limit = ULONG_MAX; | |
3924 | tpnt->max_pfn = bounce_limit; | |
3925 | ||
3926 | for (i = 0; i < ST_NBR_MODES; i++) { | |
3927 | STm = &(tpnt->modes[i]); | |
3928 | STm->defined = 0; | |
3929 | STm->sysv = ST_SYSV; | |
3930 | STm->defaults_for_writes = 0; | |
3931 | STm->do_async_writes = ST_ASYNC_WRITES; | |
3932 | STm->do_buffer_writes = ST_BUFFER_WRITES; | |
3933 | STm->do_read_ahead = ST_READ_AHEAD; | |
3934 | STm->default_compression = ST_DONT_TOUCH; | |
3935 | STm->default_blksize = (-1); /* No forced size */ | |
3936 | STm->default_density = (-1); /* No forced density */ | |
3937 | } | |
3938 | ||
3939 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
3940 | STps = &(tpnt->ps[i]); | |
3941 | STps->rw = ST_IDLE; | |
3942 | STps->eof = ST_NOEOF; | |
3943 | STps->at_sm = 0; | |
3944 | STps->last_block_valid = 0; | |
3945 | STps->drv_block = (-1); | |
3946 | STps->drv_file = (-1); | |
3947 | } | |
3948 | ||
3949 | tpnt->current_mode = 0; | |
3950 | tpnt->modes[0].defined = 1; | |
3951 | ||
3952 | tpnt->density_changed = tpnt->compression_changed = | |
3953 | tpnt->blksize_changed = 0; | |
3954 | init_MUTEX(&tpnt->lock); | |
3955 | ||
3956 | st_nr_dev++; | |
3957 | write_unlock(&st_dev_arr_lock); | |
3958 | ||
3959 | for (mode = 0; mode < ST_NBR_MODES; ++mode) { | |
3960 | STm = &(tpnt->modes[mode]); | |
3961 | for (j=0; j < 2; j++) { | |
3962 | cdev = cdev_alloc(); | |
3963 | if (!cdev) { | |
3964 | printk(KERN_ERR | |
3965 | "st%d: out of memory. Device not attached.\n", | |
3966 | dev_num); | |
3967 | goto out_free_tape; | |
3968 | } | |
3969 | cdev->owner = THIS_MODULE; | |
3970 | cdev->ops = &st_fops; | |
3971 | ||
3972 | error = cdev_add(cdev, | |
3973 | MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, j)), | |
3974 | 1); | |
3975 | if (error) { | |
3976 | printk(KERN_ERR "st%d: Can't add %s-rewind mode %d\n", | |
3977 | dev_num, j ? "non" : "auto", mode); | |
3978 | printk(KERN_ERR "st%d: Device not attached.\n", dev_num); | |
3979 | goto out_free_tape; | |
3980 | } | |
3981 | STm->cdevs[j] = cdev; | |
3982 | ||
3983 | } | |
3984 | do_create_class_files(tpnt, dev_num, mode); | |
3985 | } | |
3986 | ||
3987 | for (mode = 0; mode < ST_NBR_MODES; ++mode) { | |
3988 | /* Make sure that the minor numbers corresponding to the four | |
3989 | first modes always get the same names */ | |
3990 | i = mode << (4 - ST_NBR_MODE_BITS); | |
3991 | /* Rewind entry */ | |
3992 | devfs_mk_cdev(MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, 0)), | |
3993 | S_IFCHR | S_IRUGO | S_IWUGO, | |
3994 | "%s/mt%s", SDp->devfs_name, st_formats[i]); | |
3995 | /* No-rewind entry */ | |
3996 | devfs_mk_cdev(MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, 1)), | |
3997 | S_IFCHR | S_IRUGO | S_IWUGO, | |
3998 | "%s/mt%sn", SDp->devfs_name, st_formats[i]); | |
3999 | } | |
4000 | disk->number = devfs_register_tape(SDp->devfs_name); | |
4001 | ||
4002 | printk(KERN_WARNING | |
4003 | "Attached scsi tape %s at scsi%d, channel %d, id %d, lun %d\n", | |
4004 | tape_name(tpnt), SDp->host->host_no, SDp->channel, SDp->id, SDp->lun); | |
4005 | printk(KERN_WARNING "%s: try direct i/o: %s (alignment %d B), max page reachable by HBA %lu\n", | |
4006 | tape_name(tpnt), tpnt->try_dio ? "yes" : "no", | |
4007 | queue_dma_alignment(SDp->request_queue) + 1, tpnt->max_pfn); | |
4008 | ||
4009 | return 0; | |
4010 | ||
4011 | out_free_tape: | |
4012 | for (mode=0; mode < ST_NBR_MODES; mode++) { | |
4013 | STm = &(tpnt->modes[mode]); | |
4014 | sysfs_remove_link(&tpnt->device->sdev_gendev.kobj, | |
4015 | "tape"); | |
4016 | for (j=0; j < 2; j++) { | |
4017 | if (STm->cdevs[j]) { | |
4018 | if (cdev == STm->cdevs[j]) | |
4019 | cdev = NULL; | |
4020 | class_simple_device_remove(MKDEV(SCSI_TAPE_MAJOR, | |
4021 | TAPE_MINOR(i, mode, j))); | |
4022 | cdev_del(STm->cdevs[j]); | |
4023 | } | |
4024 | } | |
4025 | } | |
4026 | if (cdev) | |
4027 | cdev_del(cdev); | |
4028 | write_lock(&st_dev_arr_lock); | |
4029 | scsi_tapes[dev_num] = NULL; | |
4030 | st_nr_dev--; | |
4031 | write_unlock(&st_dev_arr_lock); | |
4032 | out_put_disk: | |
4033 | put_disk(disk); | |
4034 | if (tpnt) | |
4035 | kfree(tpnt); | |
4036 | out_buffer_free: | |
4037 | kfree(buffer); | |
4038 | out: | |
4039 | return -ENODEV; | |
4040 | }; | |
4041 | ||
4042 | ||
4043 | static int st_remove(struct device *dev) | |
4044 | { | |
4045 | struct scsi_device *SDp = to_scsi_device(dev); | |
4046 | struct scsi_tape *tpnt; | |
4047 | int i, j, mode; | |
4048 | ||
4049 | write_lock(&st_dev_arr_lock); | |
4050 | for (i = 0; i < st_dev_max; i++) { | |
4051 | tpnt = scsi_tapes[i]; | |
4052 | if (tpnt != NULL && tpnt->device == SDp) { | |
4053 | scsi_tapes[i] = NULL; | |
4054 | st_nr_dev--; | |
4055 | write_unlock(&st_dev_arr_lock); | |
4056 | devfs_unregister_tape(tpnt->disk->number); | |
4057 | sysfs_remove_link(&tpnt->device->sdev_gendev.kobj, | |
4058 | "tape"); | |
4059 | for (mode = 0; mode < ST_NBR_MODES; ++mode) { | |
4060 | j = mode << (4 - ST_NBR_MODE_BITS); | |
4061 | devfs_remove("%s/mt%s", SDp->devfs_name, st_formats[j]); | |
4062 | devfs_remove("%s/mt%sn", SDp->devfs_name, st_formats[j]); | |
4063 | for (j=0; j < 2; j++) { | |
4064 | class_simple_device_remove(MKDEV(SCSI_TAPE_MAJOR, | |
4065 | TAPE_MINOR(i, mode, j))); | |
4066 | cdev_del(tpnt->modes[mode].cdevs[j]); | |
4067 | tpnt->modes[mode].cdevs[j] = NULL; | |
4068 | } | |
4069 | } | |
4070 | tpnt->device = NULL; | |
4071 | ||
4072 | if (tpnt->buffer) { | |
4073 | tpnt->buffer->orig_frp_segs = 0; | |
4074 | normalize_buffer(tpnt->buffer); | |
4075 | kfree(tpnt->buffer); | |
4076 | } | |
4077 | put_disk(tpnt->disk); | |
4078 | kfree(tpnt); | |
4079 | return 0; | |
4080 | } | |
4081 | } | |
4082 | ||
4083 | write_unlock(&st_dev_arr_lock); | |
4084 | return 0; | |
4085 | } | |
4086 | ||
4087 | static void st_intr(struct scsi_cmnd *SCpnt) | |
4088 | { | |
4089 | scsi_io_completion(SCpnt, (SCpnt->result ? 0: SCpnt->bufflen), 1); | |
4090 | } | |
4091 | ||
4092 | /* | |
4093 | * st_init_command: only called via the scsi_cmd_ioctl (block SG_IO) | |
4094 | * interface for REQ_BLOCK_PC commands. | |
4095 | */ | |
4096 | static int st_init_command(struct scsi_cmnd *SCpnt) | |
4097 | { | |
4098 | struct request *rq; | |
4099 | ||
4100 | if (!(SCpnt->request->flags & REQ_BLOCK_PC)) | |
4101 | return 0; | |
4102 | ||
4103 | rq = SCpnt->request; | |
4104 | if (sizeof(rq->cmd) > sizeof(SCpnt->cmnd)) | |
4105 | return 0; | |
4106 | ||
4107 | memcpy(SCpnt->cmnd, rq->cmd, sizeof(SCpnt->cmnd)); | |
4108 | ||
4109 | if (rq_data_dir(rq) == WRITE) | |
4110 | SCpnt->sc_data_direction = DMA_TO_DEVICE; | |
4111 | else if (rq->data_len) | |
4112 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; | |
4113 | else | |
4114 | SCpnt->sc_data_direction = DMA_NONE; | |
4115 | ||
4116 | SCpnt->timeout_per_command = rq->timeout; | |
4117 | SCpnt->transfersize = rq->data_len; | |
4118 | SCpnt->done = st_intr; | |
4119 | return 1; | |
4120 | } | |
4121 | ||
4122 | static int __init init_st(void) | |
4123 | { | |
4124 | validate_options(); | |
4125 | ||
4126 | printk(KERN_INFO | |
4127 | "st: Version %s, fixed bufsize %d, s/g segs %d\n", | |
4128 | verstr, st_fixed_buffer_size, st_max_sg_segs); | |
4129 | ||
4130 | st_sysfs_class = class_simple_create(THIS_MODULE, "scsi_tape"); | |
4131 | if (IS_ERR(st_sysfs_class)) { | |
4132 | st_sysfs_class = NULL; | |
4133 | printk(KERN_ERR "Unable create sysfs class for SCSI tapes\n"); | |
4134 | return 1; | |
4135 | } | |
4136 | ||
4137 | if (!register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), | |
4138 | ST_MAX_TAPE_ENTRIES, "st")) { | |
4139 | if (scsi_register_driver(&st_template.gendrv) == 0) { | |
4140 | do_create_driverfs_files(); | |
4141 | return 0; | |
4142 | } | |
4143 | if (st_sysfs_class) | |
4144 | class_simple_destroy(st_sysfs_class); | |
4145 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), | |
4146 | ||
4147 | ST_MAX_TAPE_ENTRIES); | |
4148 | } | |
4149 | ||
4150 | printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", SCSI_TAPE_MAJOR); | |
4151 | return 1; | |
4152 | } | |
4153 | ||
4154 | static void __exit exit_st(void) | |
4155 | { | |
4156 | if (st_sysfs_class) | |
4157 | class_simple_destroy(st_sysfs_class); | |
4158 | st_sysfs_class = NULL; | |
4159 | do_remove_driverfs_files(); | |
4160 | scsi_unregister_driver(&st_template.gendrv); | |
4161 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), | |
4162 | ST_MAX_TAPE_ENTRIES); | |
4163 | kfree(scsi_tapes); | |
4164 | printk(KERN_INFO "st: Unloaded.\n"); | |
4165 | } | |
4166 | ||
4167 | module_init(init_st); | |
4168 | module_exit(exit_st); | |
4169 | ||
4170 | ||
4171 | /* The sysfs driver interface. Read-only at the moment */ | |
4172 | static ssize_t st_try_direct_io_show(struct device_driver *ddp, char *buf) | |
4173 | { | |
4174 | return snprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); | |
4175 | } | |
4176 | static DRIVER_ATTR(try_direct_io, S_IRUGO, st_try_direct_io_show, NULL); | |
4177 | ||
4178 | static ssize_t st_fixed_buffer_size_show(struct device_driver *ddp, char *buf) | |
4179 | { | |
4180 | return snprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); | |
4181 | } | |
4182 | static DRIVER_ATTR(fixed_buffer_size, S_IRUGO, st_fixed_buffer_size_show, NULL); | |
4183 | ||
4184 | static ssize_t st_max_sg_segs_show(struct device_driver *ddp, char *buf) | |
4185 | { | |
4186 | return snprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); | |
4187 | } | |
4188 | static DRIVER_ATTR(max_sg_segs, S_IRUGO, st_max_sg_segs_show, NULL); | |
4189 | ||
4190 | static ssize_t st_version_show(struct device_driver *ddd, char *buf) | |
4191 | { | |
4192 | return snprintf(buf, PAGE_SIZE, "[%s]\n", verstr); | |
4193 | } | |
4194 | static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL); | |
4195 | ||
4196 | static void do_create_driverfs_files(void) | |
4197 | { | |
4198 | struct device_driver *driverfs = &st_template.gendrv; | |
4199 | ||
4200 | driver_create_file(driverfs, &driver_attr_try_direct_io); | |
4201 | driver_create_file(driverfs, &driver_attr_fixed_buffer_size); | |
4202 | driver_create_file(driverfs, &driver_attr_max_sg_segs); | |
4203 | driver_create_file(driverfs, &driver_attr_version); | |
4204 | } | |
4205 | ||
4206 | static void do_remove_driverfs_files(void) | |
4207 | { | |
4208 | struct device_driver *driverfs = &st_template.gendrv; | |
4209 | ||
4210 | driver_remove_file(driverfs, &driver_attr_version); | |
4211 | driver_remove_file(driverfs, &driver_attr_max_sg_segs); | |
4212 | driver_remove_file(driverfs, &driver_attr_fixed_buffer_size); | |
4213 | driver_remove_file(driverfs, &driver_attr_try_direct_io); | |
4214 | } | |
4215 | ||
4216 | ||
4217 | /* The sysfs simple class interface */ | |
4218 | static ssize_t st_defined_show(struct class_device *class_dev, char *buf) | |
4219 | { | |
4220 | struct st_modedef *STm = (struct st_modedef *)class_get_devdata(class_dev); | |
4221 | ssize_t l = 0; | |
4222 | ||
4223 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); | |
4224 | return l; | |
4225 | } | |
4226 | ||
4227 | CLASS_DEVICE_ATTR(defined, S_IRUGO, st_defined_show, NULL); | |
4228 | ||
4229 | static ssize_t st_defblk_show(struct class_device *class_dev, char *buf) | |
4230 | { | |
4231 | struct st_modedef *STm = (struct st_modedef *)class_get_devdata(class_dev); | |
4232 | ssize_t l = 0; | |
4233 | ||
4234 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); | |
4235 | return l; | |
4236 | } | |
4237 | ||
4238 | CLASS_DEVICE_ATTR(default_blksize, S_IRUGO, st_defblk_show, NULL); | |
4239 | ||
4240 | static ssize_t st_defdensity_show(struct class_device *class_dev, char *buf) | |
4241 | { | |
4242 | struct st_modedef *STm = (struct st_modedef *)class_get_devdata(class_dev); | |
4243 | ssize_t l = 0; | |
4244 | char *fmt; | |
4245 | ||
4246 | fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; | |
4247 | l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); | |
4248 | return l; | |
4249 | } | |
4250 | ||
4251 | CLASS_DEVICE_ATTR(default_density, S_IRUGO, st_defdensity_show, NULL); | |
4252 | ||
4253 | static ssize_t st_defcompression_show(struct class_device *class_dev, char *buf) | |
4254 | { | |
4255 | struct st_modedef *STm = (struct st_modedef *)class_get_devdata(class_dev); | |
4256 | ssize_t l = 0; | |
4257 | ||
4258 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); | |
4259 | return l; | |
4260 | } | |
4261 | ||
4262 | CLASS_DEVICE_ATTR(default_compression, S_IRUGO, st_defcompression_show, NULL); | |
4263 | ||
4264 | static void do_create_class_files(struct scsi_tape *STp, int dev_num, int mode) | |
4265 | { | |
4266 | int i, rew, error; | |
4267 | char name[10]; | |
4268 | struct class_device *st_class_member; | |
4269 | ||
4270 | if (!st_sysfs_class) | |
4271 | return; | |
4272 | ||
4273 | for (rew=0; rew < 2; rew++) { | |
4274 | /* Make sure that the minor numbers corresponding to the four | |
4275 | first modes always get the same names */ | |
4276 | i = mode << (4 - ST_NBR_MODE_BITS); | |
4277 | snprintf(name, 10, "%s%s%s", rew ? "n" : "", | |
4278 | STp->disk->disk_name, st_formats[i]); | |
4279 | st_class_member = | |
4280 | class_simple_device_add(st_sysfs_class, | |
4281 | MKDEV(SCSI_TAPE_MAJOR, | |
4282 | TAPE_MINOR(dev_num, mode, rew)), | |
4283 | &STp->device->sdev_gendev, "%s", name); | |
4284 | if (IS_ERR(st_class_member)) { | |
4285 | printk(KERN_WARNING "st%d: class_simple_device_add failed\n", | |
4286 | dev_num); | |
4287 | goto out; | |
4288 | } | |
4289 | class_set_devdata(st_class_member, &STp->modes[mode]); | |
4290 | ||
4291 | class_device_create_file(st_class_member, | |
4292 | &class_device_attr_defined); | |
4293 | class_device_create_file(st_class_member, | |
4294 | &class_device_attr_default_blksize); | |
4295 | class_device_create_file(st_class_member, | |
4296 | &class_device_attr_default_density); | |
4297 | class_device_create_file(st_class_member, | |
4298 | &class_device_attr_default_compression); | |
4299 | if (mode == 0 && rew == 0) { | |
4300 | error = sysfs_create_link(&STp->device->sdev_gendev.kobj, | |
4301 | &st_class_member->kobj, | |
4302 | "tape"); | |
4303 | if (error) { | |
4304 | printk(KERN_ERR | |
4305 | "st%d: Can't create sysfs link from SCSI device.\n", | |
4306 | dev_num); | |
4307 | } | |
4308 | } | |
4309 | } | |
4310 | out: | |
4311 | return; | |
4312 | } | |
4313 | ||
4314 | ||
4315 | /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if | |
4316 | - mapping of all pages not successful | |
4317 | - any page is above max_pfn | |
4318 | (i.e., either completely successful or fails) | |
4319 | */ | |
4320 | static int st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, | |
4321 | unsigned long uaddr, size_t count, int rw, | |
4322 | unsigned long max_pfn) | |
4323 | { | |
4324 | int i, nr_pages; | |
4325 | ||
4326 | nr_pages = sgl_map_user_pages(sgl, max_pages, uaddr, count, rw); | |
4327 | if (nr_pages <= 0) | |
4328 | return nr_pages; | |
4329 | ||
4330 | for (i=0; i < nr_pages; i++) { | |
4331 | if (page_to_pfn(sgl[i].page) > max_pfn) | |
4332 | goto out_unmap; | |
4333 | } | |
4334 | return nr_pages; | |
4335 | ||
4336 | out_unmap: | |
4337 | sgl_unmap_user_pages(sgl, nr_pages, 0); | |
4338 | return 0; | |
4339 | } | |
4340 | ||
4341 | ||
4342 | /* The following functions may be useful for a larger audience. */ | |
4343 | static int sgl_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, | |
4344 | unsigned long uaddr, size_t count, int rw) | |
4345 | { | |
4346 | int res, i, j; | |
4347 | unsigned int nr_pages; | |
4348 | struct page **pages; | |
4349 | ||
4350 | nr_pages = ((uaddr & ~PAGE_MASK) + count + ~PAGE_MASK) >> PAGE_SHIFT; | |
4351 | ||
4352 | /* User attempted Overflow! */ | |
4353 | if ((uaddr + count) < uaddr) | |
4354 | return -EINVAL; | |
4355 | ||
4356 | /* Too big */ | |
4357 | if (nr_pages > max_pages) | |
4358 | return -ENOMEM; | |
4359 | ||
4360 | /* Hmm? */ | |
4361 | if (count == 0) | |
4362 | return 0; | |
4363 | ||
4364 | if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL) | |
4365 | return -ENOMEM; | |
4366 | ||
4367 | /* Try to fault in all of the necessary pages */ | |
4368 | down_read(¤t->mm->mmap_sem); | |
4369 | /* rw==READ means read from drive, write into memory area */ | |
4370 | res = get_user_pages( | |
4371 | current, | |
4372 | current->mm, | |
4373 | uaddr, | |
4374 | nr_pages, | |
4375 | rw == READ, | |
4376 | 0, /* don't force */ | |
4377 | pages, | |
4378 | NULL); | |
4379 | up_read(¤t->mm->mmap_sem); | |
4380 | ||
4381 | /* Errors and no page mapped should return here */ | |
4382 | if (res < nr_pages) | |
4383 | goto out_unmap; | |
4384 | ||
4385 | for (i=0; i < nr_pages; i++) { | |
4386 | /* FIXME: flush superflous for rw==READ, | |
4387 | * probably wrong function for rw==WRITE | |
4388 | */ | |
4389 | flush_dcache_page(pages[i]); | |
4390 | } | |
4391 | ||
4392 | /* Populate the scatter/gather list */ | |
4393 | sgl[0].page = pages[0]; | |
4394 | sgl[0].offset = uaddr & ~PAGE_MASK; | |
4395 | if (nr_pages > 1) { | |
4396 | sgl[0].length = PAGE_SIZE - sgl[0].offset; | |
4397 | count -= sgl[0].length; | |
4398 | for (i=1; i < nr_pages ; i++) { | |
4399 | sgl[i].offset = 0; | |
4400 | sgl[i].page = pages[i]; | |
4401 | sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE; | |
4402 | count -= PAGE_SIZE; | |
4403 | } | |
4404 | } | |
4405 | else { | |
4406 | sgl[0].length = count; | |
4407 | } | |
4408 | ||
4409 | kfree(pages); | |
4410 | return nr_pages; | |
4411 | ||
4412 | out_unmap: | |
4413 | if (res > 0) { | |
4414 | for (j=0; j < res; j++) | |
4415 | page_cache_release(pages[j]); | |
4416 | } | |
4417 | kfree(pages); | |
4418 | return res; | |
4419 | } | |
4420 | ||
4421 | ||
4422 | /* And unmap them... */ | |
4423 | static int sgl_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, | |
4424 | int dirtied) | |
4425 | { | |
4426 | int i; | |
4427 | ||
4428 | for (i=0; i < nr_pages; i++) { | |
4429 | if (dirtied && !PageReserved(sgl[i].page)) | |
4430 | SetPageDirty(sgl[i].page); | |
4431 | /* FIXME: cache flush missing for rw==READ | |
4432 | * FIXME: call the correct reference counting function | |
4433 | */ | |
4434 | page_cache_release(sgl[i].page); | |
4435 | } | |
4436 | ||
4437 | return 0; | |
4438 | } |