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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying | |
3 | file Documentation/scsi/st.txt for more information. | |
4 | ||
5 | History: | |
6 | Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara. | |
7 | Contribution and ideas from several people including (in alphabetical | |
8 | order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk, | |
9 | Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky, | |
10 | Michael Schaefer, J"org Weule, and Eric Youngdale. | |
11 | ||
fd66c1b4 | 12 | Copyright 1992 - 2008 Kai Makisara |
1da177e4 LT |
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 | ||
02ae2c0e | 20 | static const char *verstr = "20081215"; |
1da177e4 LT |
21 | |
22 | #include <linux/module.h> | |
23 | ||
24 | #include <linux/fs.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/sched.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/mtio.h> | |
16c4b3e2 | 32 | #include <linux/cdrom.h> |
1da177e4 LT |
33 | #include <linux/ioctl.h> |
34 | #include <linux/fcntl.h> | |
35 | #include <linux/spinlock.h> | |
36 | #include <linux/blkdev.h> | |
37 | #include <linux/moduleparam.h> | |
1da177e4 LT |
38 | #include <linux/cdev.h> |
39 | #include <linux/delay.h> | |
0b950672 | 40 | #include <linux/mutex.h> |
b3369c68 | 41 | #include <linux/smp_lock.h> |
1da177e4 LT |
42 | |
43 | #include <asm/uaccess.h> | |
44 | #include <asm/dma.h> | |
45 | #include <asm/system.h> | |
46 | ||
47 | #include <scsi/scsi.h> | |
48 | #include <scsi/scsi_dbg.h> | |
49 | #include <scsi/scsi_device.h> | |
50 | #include <scsi/scsi_driver.h> | |
51 | #include <scsi/scsi_eh.h> | |
52 | #include <scsi/scsi_host.h> | |
53 | #include <scsi/scsi_ioctl.h> | |
16c4b3e2 | 54 | #include <scsi/sg.h> |
1da177e4 LT |
55 | |
56 | ||
57 | /* The driver prints some debugging information on the console if DEBUG | |
58 | is defined and non-zero. */ | |
59 | #define DEBUG 0 | |
60 | ||
61 | #if DEBUG | |
62 | /* The message level for the debug messages is currently set to KERN_NOTICE | |
63 | so that people can easily see the messages. Later when the debugging messages | |
64 | in the drivers are more widely classified, this may be changed to KERN_DEBUG. */ | |
65 | #define ST_DEB_MSG KERN_NOTICE | |
66 | #define DEB(a) a | |
67 | #define DEBC(a) if (debugging) { a ; } | |
68 | #else | |
69 | #define DEB(a) | |
70 | #define DEBC(a) | |
71 | #endif | |
72 | ||
73 | #define ST_KILOBYTE 1024 | |
74 | ||
75 | #include "st_options.h" | |
76 | #include "st.h" | |
77 | ||
78 | static int buffer_kbs; | |
79 | static int max_sg_segs; | |
80 | static int try_direct_io = TRY_DIRECT_IO; | |
81 | static int try_rdio = 1; | |
82 | static int try_wdio = 1; | |
83 | ||
84 | static int st_dev_max; | |
85 | static int st_nr_dev; | |
86 | ||
d253878b | 87 | static struct class *st_sysfs_class; |
1da177e4 LT |
88 | |
89 | MODULE_AUTHOR("Kai Makisara"); | |
f018fa55 | 90 | MODULE_DESCRIPTION("SCSI tape (st) driver"); |
1da177e4 | 91 | MODULE_LICENSE("GPL"); |
f018fa55 | 92 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR); |
d7b8bcb0 | 93 | MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE); |
1da177e4 LT |
94 | |
95 | /* Set 'perm' (4th argument) to 0 to disable module_param's definition | |
96 | * of sysfs parameters (which module_param doesn't yet support). | |
97 | * Sysfs parameters defined explicitly later. | |
98 | */ | |
99 | module_param_named(buffer_kbs, buffer_kbs, int, 0); | |
100 | MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)"); | |
101 | module_param_named(max_sg_segs, max_sg_segs, int, 0); | |
102 | MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)"); | |
103 | module_param_named(try_direct_io, try_direct_io, int, 0); | |
104 | MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)"); | |
105 | ||
106 | /* Extra parameters for testing */ | |
107 | module_param_named(try_rdio, try_rdio, int, 0); | |
108 | MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); | |
109 | module_param_named(try_wdio, try_wdio, int, 0); | |
110 | MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); | |
111 | ||
112 | #ifndef MODULE | |
113 | static int write_threshold_kbs; /* retained for compatibility */ | |
114 | static struct st_dev_parm { | |
115 | char *name; | |
116 | int *val; | |
117 | } parms[] __initdata = { | |
118 | { | |
119 | "buffer_kbs", &buffer_kbs | |
120 | }, | |
121 | { /* Retained for compatibility with 2.4 */ | |
122 | "write_threshold_kbs", &write_threshold_kbs | |
123 | }, | |
124 | { | |
125 | "max_sg_segs", NULL | |
126 | }, | |
127 | { | |
128 | "try_direct_io", &try_direct_io | |
129 | } | |
130 | }; | |
131 | #endif | |
132 | ||
133 | /* Restrict the number of modes so that names for all are assigned */ | |
134 | #if ST_NBR_MODES > 16 | |
135 | #error "Maximum number of modes is 16" | |
136 | #endif | |
137 | /* Bit reversed order to get same names for same minors with all | |
138 | mode counts */ | |
0ad78200 | 139 | static const char *st_formats[] = { |
1da177e4 LT |
140 | "", "r", "k", "s", "l", "t", "o", "u", |
141 | "m", "v", "p", "x", "a", "y", "q", "z"}; | |
142 | ||
143 | /* The default definitions have been moved to st_options.h */ | |
144 | ||
145 | #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) | |
146 | ||
147 | /* The buffer size should fit into the 24 bits for length in the | |
148 | 6-byte SCSI read and write commands. */ | |
149 | #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) | |
150 | #error "Buffer size should not exceed (2 << 24 - 1) bytes!" | |
151 | #endif | |
152 | ||
153 | static int debugging = DEBUG; | |
154 | ||
155 | #define MAX_RETRIES 0 | |
156 | #define MAX_WRITE_RETRIES 0 | |
157 | #define MAX_READY_RETRIES 0 | |
158 | #define NO_TAPE NOT_READY | |
159 | ||
160 | #define ST_TIMEOUT (900 * HZ) | |
161 | #define ST_LONG_TIMEOUT (14000 * HZ) | |
162 | ||
163 | /* Remove mode bits and auto-rewind bit (7) */ | |
164 | #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ | |
165 | (iminor(x) & ~(-1 << ST_MODE_SHIFT)) ) | |
166 | #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) | |
167 | ||
168 | /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ | |
169 | #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ | |
170 | (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) | |
171 | ||
172 | /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower | |
173 | 24 bits) */ | |
174 | #define SET_DENS_AND_BLK 0x10001 | |
175 | ||
176 | static DEFINE_RWLOCK(st_dev_arr_lock); | |
177 | ||
178 | static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; | |
179 | static int st_max_sg_segs = ST_MAX_SG; | |
180 | ||
181 | static struct scsi_tape **scsi_tapes = NULL; | |
182 | ||
183 | static int modes_defined; | |
184 | ||
1da177e4 | 185 | static int enlarge_buffer(struct st_buffer *, int, int); |
40f6b36c | 186 | static void clear_buffer(struct st_buffer *); |
1da177e4 LT |
187 | static void normalize_buffer(struct st_buffer *); |
188 | static int append_to_buffer(const char __user *, struct st_buffer *, int); | |
189 | static int from_buffer(struct st_buffer *, char __user *, int); | |
190 | static void move_buffer_data(struct st_buffer *, int); | |
1da177e4 | 191 | |
6620742f | 192 | static int sgl_map_user_pages(struct st_buffer *, const unsigned int, |
1da177e4 | 193 | unsigned long, size_t, int); |
6620742f | 194 | static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int); |
1da177e4 LT |
195 | |
196 | static int st_probe(struct device *); | |
197 | static int st_remove(struct device *); | |
1da177e4 | 198 | |
405ae7d3 RD |
199 | static int do_create_sysfs_files(void); |
200 | static void do_remove_sysfs_files(void); | |
13026a6b | 201 | static int do_create_class_files(struct scsi_tape *, int, int); |
1da177e4 LT |
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 | }, | |
1da177e4 LT |
210 | }; |
211 | ||
212 | static int st_compression(struct scsi_tape *, int); | |
213 | ||
214 | static int find_partition(struct scsi_tape *); | |
215 | static int switch_partition(struct scsi_tape *); | |
216 | ||
217 | static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); | |
218 | ||
f03a5670 KM |
219 | static void scsi_tape_release(struct kref *); |
220 | ||
221 | #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref) | |
222 | ||
0b950672 | 223 | static DEFINE_MUTEX(st_ref_mutex); |
f03a5670 | 224 | |
1da177e4 LT |
225 | \f |
226 | #include "osst_detect.h" | |
227 | #ifndef SIGS_FROM_OSST | |
228 | #define SIGS_FROM_OSST \ | |
229 | {"OnStream", "SC-", "", "osst"}, \ | |
230 | {"OnStream", "DI-", "", "osst"}, \ | |
231 | {"OnStream", "DP-", "", "osst"}, \ | |
232 | {"OnStream", "USB", "", "osst"}, \ | |
233 | {"OnStream", "FW-", "", "osst"} | |
234 | #endif | |
235 | ||
f03a5670 KM |
236 | static struct scsi_tape *scsi_tape_get(int dev) |
237 | { | |
238 | struct scsi_tape *STp = NULL; | |
239 | ||
0b950672 | 240 | mutex_lock(&st_ref_mutex); |
f03a5670 KM |
241 | write_lock(&st_dev_arr_lock); |
242 | ||
243 | if (dev < st_dev_max && scsi_tapes != NULL) | |
244 | STp = scsi_tapes[dev]; | |
245 | if (!STp) goto out; | |
246 | ||
247 | kref_get(&STp->kref); | |
248 | ||
249 | if (!STp->device) | |
250 | goto out_put; | |
251 | ||
252 | if (scsi_device_get(STp->device)) | |
253 | goto out_put; | |
254 | ||
255 | goto out; | |
256 | ||
257 | out_put: | |
258 | kref_put(&STp->kref, scsi_tape_release); | |
259 | STp = NULL; | |
260 | out: | |
261 | write_unlock(&st_dev_arr_lock); | |
0b950672 | 262 | mutex_unlock(&st_ref_mutex); |
f03a5670 KM |
263 | return STp; |
264 | } | |
265 | ||
266 | static void scsi_tape_put(struct scsi_tape *STp) | |
267 | { | |
268 | struct scsi_device *sdev = STp->device; | |
269 | ||
0b950672 | 270 | mutex_lock(&st_ref_mutex); |
f03a5670 KM |
271 | kref_put(&STp->kref, scsi_tape_release); |
272 | scsi_device_put(sdev); | |
0b950672 | 273 | mutex_unlock(&st_ref_mutex); |
f03a5670 KM |
274 | } |
275 | ||
1da177e4 LT |
276 | struct st_reject_data { |
277 | char *vendor; | |
278 | char *model; | |
279 | char *rev; | |
280 | char *driver_hint; /* Name of the correct driver, NULL if unknown */ | |
281 | }; | |
282 | ||
283 | static struct st_reject_data reject_list[] = { | |
284 | /* {"XXX", "Yy-", "", NULL}, example */ | |
285 | SIGS_FROM_OSST, | |
286 | {NULL, }}; | |
287 | ||
288 | /* If the device signature is on the list of incompatible drives, the | |
289 | function returns a pointer to the name of the correct driver (if known) */ | |
290 | static char * st_incompatible(struct scsi_device* SDp) | |
291 | { | |
292 | struct st_reject_data *rp; | |
293 | ||
294 | for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) | |
295 | if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && | |
296 | !strncmp(rp->model, SDp->model, strlen(rp->model)) && | |
297 | !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { | |
298 | if (rp->driver_hint) | |
299 | return rp->driver_hint; | |
300 | else | |
301 | return "unknown"; | |
302 | } | |
303 | return NULL; | |
304 | } | |
305 | \f | |
306 | ||
307 | static inline char *tape_name(struct scsi_tape *tape) | |
308 | { | |
309 | return tape->disk->disk_name; | |
310 | } | |
311 | ||
312 | ||
8b05b773 | 313 | static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s) |
1da177e4 LT |
314 | { |
315 | const u8 *ucp; | |
8b05b773 | 316 | const u8 *sense = SRpnt->sense; |
1da177e4 | 317 | |
8b05b773 MC |
318 | s->have_sense = scsi_normalize_sense(SRpnt->sense, |
319 | SCSI_SENSE_BUFFERSIZE, &s->sense_hdr); | |
1da177e4 LT |
320 | s->flags = 0; |
321 | ||
322 | if (s->have_sense) { | |
323 | s->deferred = 0; | |
324 | s->remainder_valid = | |
325 | scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); | |
326 | switch (sense[0] & 0x7f) { | |
327 | case 0x71: | |
328 | s->deferred = 1; | |
329 | case 0x70: | |
330 | s->fixed_format = 1; | |
331 | s->flags = sense[2] & 0xe0; | |
332 | break; | |
333 | case 0x73: | |
334 | s->deferred = 1; | |
335 | case 0x72: | |
336 | s->fixed_format = 0; | |
337 | ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); | |
338 | s->flags = ucp ? (ucp[3] & 0xe0) : 0; | |
339 | break; | |
340 | } | |
341 | } | |
342 | } | |
343 | ||
344 | ||
345 | /* Convert the result to success code */ | |
8b05b773 | 346 | static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt) |
1da177e4 | 347 | { |
8b05b773 | 348 | int result = SRpnt->result; |
1da177e4 LT |
349 | u8 scode; |
350 | DEB(const char *stp;) | |
351 | char *name = tape_name(STp); | |
352 | struct st_cmdstatus *cmdstatp; | |
353 | ||
354 | if (!result) | |
355 | return 0; | |
356 | ||
357 | cmdstatp = &STp->buffer->cmdstat; | |
f03a5670 | 358 | st_analyze_sense(SRpnt, cmdstatp); |
1da177e4 LT |
359 | |
360 | if (cmdstatp->have_sense) | |
361 | scode = STp->buffer->cmdstat.sense_hdr.sense_key; | |
362 | else | |
363 | scode = 0; | |
364 | ||
365 | DEB( | |
366 | if (debugging) { | |
8b05b773 | 367 | printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x\n", |
1da177e4 | 368 | name, result, |
8b05b773 MC |
369 | SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2], |
370 | SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]); | |
1da177e4 | 371 | if (cmdstatp->have_sense) |
4e73ea7b | 372 | __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE); |
1da177e4 LT |
373 | } ) /* end DEB */ |
374 | if (!debugging) { /* Abnormal conditions for tape */ | |
375 | if (!cmdstatp->have_sense) | |
376 | printk(KERN_WARNING | |
1c9fbafc MP |
377 | "%s: Error %x (driver bt 0x%x, host bt 0x%x).\n", |
378 | name, result, driver_byte(result), | |
379 | host_byte(result)); | |
1da177e4 LT |
380 | else if (cmdstatp->have_sense && |
381 | scode != NO_SENSE && | |
382 | scode != RECOVERED_ERROR && | |
383 | /* scode != UNIT_ATTENTION && */ | |
384 | scode != BLANK_CHECK && | |
385 | scode != VOLUME_OVERFLOW && | |
8b05b773 MC |
386 | SRpnt->cmd[0] != MODE_SENSE && |
387 | SRpnt->cmd[0] != TEST_UNIT_READY) { | |
4e73ea7b LT |
388 | |
389 | __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE); | |
1da177e4 LT |
390 | } |
391 | } | |
392 | ||
393 | if (cmdstatp->fixed_format && | |
394 | STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ | |
395 | if (STp->cln_sense_value) | |
8b05b773 | 396 | STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & |
1da177e4 LT |
397 | STp->cln_sense_mask) == STp->cln_sense_value); |
398 | else | |
8b05b773 | 399 | STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & |
1da177e4 LT |
400 | STp->cln_sense_mask) != 0); |
401 | } | |
402 | if (cmdstatp->have_sense && | |
403 | cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17) | |
404 | STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */ | |
405 | ||
406 | STp->pos_unknown |= STp->device->was_reset; | |
407 | ||
408 | if (cmdstatp->have_sense && | |
409 | scode == RECOVERED_ERROR | |
410 | #if ST_RECOVERED_WRITE_FATAL | |
8b05b773 MC |
411 | && SRpnt->cmd[0] != WRITE_6 |
412 | && SRpnt->cmd[0] != WRITE_FILEMARKS | |
1da177e4 LT |
413 | #endif |
414 | ) { | |
415 | STp->recover_count++; | |
416 | STp->recover_reg++; | |
417 | ||
418 | DEB( | |
419 | if (debugging) { | |
8b05b773 | 420 | if (SRpnt->cmd[0] == READ_6) |
1da177e4 | 421 | stp = "read"; |
8b05b773 | 422 | else if (SRpnt->cmd[0] == WRITE_6) |
1da177e4 LT |
423 | stp = "write"; |
424 | else | |
425 | stp = "ioctl"; | |
426 | printk(ST_DEB_MSG "%s: Recovered %s error (%d).\n", name, stp, | |
427 | STp->recover_count); | |
428 | } ) /* end DEB */ | |
429 | ||
430 | if (cmdstatp->flags == 0) | |
431 | return 0; | |
432 | } | |
433 | return (-EIO); | |
434 | } | |
435 | ||
4deba245 | 436 | static struct st_request *st_allocate_request(struct scsi_tape *stp) |
8b05b773 | 437 | { |
4deba245 FT |
438 | struct st_request *streq; |
439 | ||
440 | streq = kzalloc(sizeof(*streq), GFP_KERNEL); | |
441 | if (streq) | |
442 | streq->stp = stp; | |
443 | else { | |
444 | DEBC(printk(KERN_ERR "%s: Can't get SCSI request.\n", | |
445 | tape_name(stp));); | |
446 | if (signal_pending(current)) | |
447 | stp->buffer->syscall_result = -EINTR; | |
448 | else | |
449 | stp->buffer->syscall_result = -EBUSY; | |
450 | } | |
451 | ||
452 | return streq; | |
8b05b773 MC |
453 | } |
454 | ||
455 | static void st_release_request(struct st_request *streq) | |
456 | { | |
457 | kfree(streq); | |
1da177e4 LT |
458 | } |
459 | ||
13b53b44 FT |
460 | static void st_scsi_execute_end(struct request *req, int uptodate) |
461 | { | |
462 | struct st_request *SRpnt = req->end_io_data; | |
463 | struct scsi_tape *STp = SRpnt->stp; | |
464 | ||
465 | STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors; | |
c3a4d78c | 466 | STp->buffer->cmdstat.residual = req->resid_len; |
13b53b44 FT |
467 | |
468 | if (SRpnt->waiting) | |
469 | complete(SRpnt->waiting); | |
470 | ||
471 | blk_rq_unmap_user(SRpnt->bio); | |
472 | __blk_put_request(req->q, req); | |
473 | } | |
474 | ||
475 | static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, | |
476 | int data_direction, void *buffer, unsigned bufflen, | |
477 | int timeout, int retries) | |
478 | { | |
479 | struct request *req; | |
480 | struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data; | |
481 | int err = 0; | |
482 | int write = (data_direction == DMA_TO_DEVICE); | |
483 | ||
484 | req = blk_get_request(SRpnt->stp->device->request_queue, write, | |
485 | GFP_KERNEL); | |
486 | if (!req) | |
487 | return DRIVER_ERROR << 24; | |
488 | ||
489 | req->cmd_type = REQ_TYPE_BLOCK_PC; | |
490 | req->cmd_flags |= REQ_QUIET; | |
491 | ||
492 | mdata->null_mapped = 1; | |
493 | ||
02ae2c0e KM |
494 | if (bufflen) { |
495 | err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, | |
496 | GFP_KERNEL); | |
497 | if (err) { | |
498 | blk_put_request(req); | |
499 | return DRIVER_ERROR << 24; | |
500 | } | |
13b53b44 FT |
501 | } |
502 | ||
503 | SRpnt->bio = req->bio; | |
504 | req->cmd_len = COMMAND_SIZE(cmd[0]); | |
505 | memset(req->cmd, 0, BLK_MAX_CDB); | |
506 | memcpy(req->cmd, cmd, req->cmd_len); | |
507 | req->sense = SRpnt->sense; | |
508 | req->sense_len = 0; | |
509 | req->timeout = timeout; | |
510 | req->retries = retries; | |
511 | req->end_io_data = SRpnt; | |
512 | ||
513 | blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end); | |
514 | return 0; | |
515 | } | |
516 | ||
1da177e4 LT |
517 | /* Do the scsi command. Waits until command performed if do_wait is true. |
518 | Otherwise write_behind_check() is used to check that the command | |
519 | has finished. */ | |
8b05b773 MC |
520 | static struct st_request * |
521 | st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, | |
1da177e4 LT |
522 | int bytes, int direction, int timeout, int retries, int do_wait) |
523 | { | |
f03a5670 | 524 | struct completion *waiting; |
6d476267 FT |
525 | struct rq_map_data *mdata = &STp->buffer->map_data; |
526 | int ret; | |
1da177e4 | 527 | |
f03a5670 KM |
528 | /* if async, make sure there's no command outstanding */ |
529 | if (!do_wait && ((STp->buffer)->last_SRpnt)) { | |
530 | printk(KERN_ERR "%s: Async command already active.\n", | |
531 | tape_name(STp)); | |
532 | if (signal_pending(current)) | |
533 | (STp->buffer)->syscall_result = (-EINTR); | |
534 | else | |
535 | (STp->buffer)->syscall_result = (-EBUSY); | |
536 | return NULL; | |
537 | } | |
538 | ||
4deba245 FT |
539 | if (!SRpnt) { |
540 | SRpnt = st_allocate_request(STp); | |
541 | if (!SRpnt) | |
1da177e4 | 542 | return NULL; |
1da177e4 LT |
543 | } |
544 | ||
f03a5670 KM |
545 | /* If async IO, set last_SRpnt. This ptr tells write_behind_check |
546 | which IO is outstanding. It's nulled out when the IO completes. */ | |
547 | if (!do_wait) | |
548 | (STp->buffer)->last_SRpnt = SRpnt; | |
549 | ||
550 | waiting = &STp->wait; | |
551 | init_completion(waiting); | |
8b05b773 | 552 | SRpnt->waiting = waiting; |
1da177e4 | 553 | |
6620742f FT |
554 | if (STp->buffer->do_dio) { |
555 | mdata->nr_entries = STp->buffer->sg_segs; | |
556 | mdata->pages = STp->buffer->mapped_pages; | |
557 | } else { | |
6d476267 FT |
558 | mdata->nr_entries = |
559 | DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order); | |
560 | STp->buffer->map_data.pages = STp->buffer->reserved_pages; | |
561 | STp->buffer->map_data.offset = 0; | |
562 | } | |
563 | ||
8b05b773 MC |
564 | memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd)); |
565 | STp->buffer->cmdstat.have_sense = 0; | |
566 | STp->buffer->syscall_result = 0; | |
567 | ||
6620742f FT |
568 | ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout, |
569 | retries); | |
6d476267 | 570 | if (ret) { |
8b05b773 MC |
571 | /* could not allocate the buffer or request was too large */ |
572 | (STp->buffer)->syscall_result = (-EBUSY); | |
787926b1 | 573 | (STp->buffer)->last_SRpnt = NULL; |
6d476267 | 574 | } else if (do_wait) { |
f03a5670 | 575 | wait_for_completion(waiting); |
8b05b773 | 576 | SRpnt->waiting = NULL; |
1da177e4 LT |
577 | (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); |
578 | } | |
8b05b773 | 579 | |
1da177e4 LT |
580 | return SRpnt; |
581 | } | |
582 | ||
583 | ||
584 | /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if | |
585 | write has been correct but EOM early warning reached, -EIO if write ended in | |
586 | error or zero if write successful. Asynchronous writes are used only in | |
587 | variable block mode. */ | |
588 | static int write_behind_check(struct scsi_tape * STp) | |
589 | { | |
590 | int retval = 0; | |
591 | struct st_buffer *STbuffer; | |
592 | struct st_partstat *STps; | |
593 | struct st_cmdstatus *cmdstatp; | |
8b05b773 | 594 | struct st_request *SRpnt; |
1da177e4 LT |
595 | |
596 | STbuffer = STp->buffer; | |
597 | if (!STbuffer->writing) | |
598 | return 0; | |
599 | ||
600 | DEB( | |
601 | if (STp->write_pending) | |
602 | STp->nbr_waits++; | |
603 | else | |
604 | STp->nbr_finished++; | |
605 | ) /* end DEB */ | |
606 | ||
607 | wait_for_completion(&(STp->wait)); | |
f03a5670 KM |
608 | SRpnt = STbuffer->last_SRpnt; |
609 | STbuffer->last_SRpnt = NULL; | |
8b05b773 | 610 | SRpnt->waiting = NULL; |
1da177e4 | 611 | |
f03a5670 | 612 | (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); |
8b05b773 | 613 | st_release_request(SRpnt); |
1da177e4 LT |
614 | |
615 | STbuffer->buffer_bytes -= STbuffer->writing; | |
616 | STps = &(STp->ps[STp->partition]); | |
617 | if (STps->drv_block >= 0) { | |
618 | if (STp->block_size == 0) | |
619 | STps->drv_block++; | |
620 | else | |
621 | STps->drv_block += STbuffer->writing / STp->block_size; | |
622 | } | |
623 | ||
624 | cmdstatp = &STbuffer->cmdstat; | |
625 | if (STbuffer->syscall_result) { | |
626 | retval = -EIO; | |
627 | if (cmdstatp->have_sense && !cmdstatp->deferred && | |
628 | (cmdstatp->flags & SENSE_EOM) && | |
629 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
630 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) { | |
631 | /* EOM at write-behind, has all data been written? */ | |
632 | if (!cmdstatp->remainder_valid || | |
633 | cmdstatp->uremainder64 == 0) | |
634 | retval = -ENOSPC; | |
635 | } | |
636 | if (retval == -EIO) | |
637 | STps->drv_block = -1; | |
638 | } | |
639 | STbuffer->writing = 0; | |
640 | ||
641 | DEB(if (debugging && retval) | |
642 | printk(ST_DEB_MSG "%s: Async write error %x, return value %d.\n", | |
643 | tape_name(STp), STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */ | |
644 | ||
645 | return retval; | |
646 | } | |
647 | ||
648 | ||
649 | /* Step over EOF if it has been inadvertently crossed (ioctl not used because | |
650 | it messes up the block number). */ | |
651 | static int cross_eof(struct scsi_tape * STp, int forward) | |
652 | { | |
8b05b773 | 653 | struct st_request *SRpnt; |
1da177e4 LT |
654 | unsigned char cmd[MAX_COMMAND_SIZE]; |
655 | ||
656 | cmd[0] = SPACE; | |
657 | cmd[1] = 0x01; /* Space FileMarks */ | |
658 | if (forward) { | |
659 | cmd[2] = cmd[3] = 0; | |
660 | cmd[4] = 1; | |
661 | } else | |
662 | cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ | |
663 | cmd[5] = 0; | |
664 | ||
665 | DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n", | |
666 | tape_name(STp), forward ? "forward" : "backward")); | |
667 | ||
02ae2c0e KM |
668 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
669 | STp->device->request_queue->rq_timeout, | |
670 | MAX_RETRIES, 1); | |
1da177e4 | 671 | if (!SRpnt) |
02ae2c0e | 672 | return (STp->buffer)->syscall_result; |
39ade4b1 | 673 | |
02ae2c0e KM |
674 | st_release_request(SRpnt); |
675 | SRpnt = NULL; | |
1da177e4 LT |
676 | |
677 | if ((STp->buffer)->cmdstat.midlevel_result != 0) | |
678 | printk(KERN_ERR "%s: Stepping over filemark %s failed.\n", | |
679 | tape_name(STp), forward ? "forward" : "backward"); | |
680 | ||
02ae2c0e | 681 | return (STp->buffer)->syscall_result; |
1da177e4 LT |
682 | } |
683 | ||
684 | ||
685 | /* Flush the write buffer (never need to write if variable blocksize). */ | |
8ef8d594 | 686 | static int st_flush_write_buffer(struct scsi_tape * STp) |
1da177e4 | 687 | { |
786231af | 688 | int transfer, blks; |
1da177e4 LT |
689 | int result; |
690 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 691 | struct st_request *SRpnt; |
1da177e4 LT |
692 | struct st_partstat *STps; |
693 | ||
694 | result = write_behind_check(STp); | |
695 | if (result) | |
696 | return result; | |
697 | ||
698 | result = 0; | |
699 | if (STp->dirty == 1) { | |
700 | ||
786231af | 701 | transfer = STp->buffer->buffer_bytes; |
1da177e4 LT |
702 | DEBC(printk(ST_DEB_MSG "%s: Flushing %d bytes.\n", |
703 | tape_name(STp), transfer)); | |
704 | ||
1da177e4 LT |
705 | memset(cmd, 0, MAX_COMMAND_SIZE); |
706 | cmd[0] = WRITE_6; | |
707 | cmd[1] = 1; | |
708 | blks = transfer / STp->block_size; | |
709 | cmd[2] = blks >> 16; | |
710 | cmd[3] = blks >> 8; | |
711 | cmd[4] = blks; | |
712 | ||
713 | SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE, | |
a02488ed JB |
714 | STp->device->request_queue->rq_timeout, |
715 | MAX_WRITE_RETRIES, 1); | |
1da177e4 LT |
716 | if (!SRpnt) |
717 | return (STp->buffer)->syscall_result; | |
718 | ||
719 | STps = &(STp->ps[STp->partition]); | |
720 | if ((STp->buffer)->syscall_result != 0) { | |
721 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
722 | ||
723 | if (cmdstatp->have_sense && !cmdstatp->deferred && | |
724 | (cmdstatp->flags & SENSE_EOM) && | |
725 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
726 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && | |
727 | (!cmdstatp->remainder_valid || | |
728 | cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */ | |
729 | STp->dirty = 0; | |
730 | (STp->buffer)->buffer_bytes = 0; | |
731 | if (STps->drv_block >= 0) | |
732 | STps->drv_block += blks; | |
733 | result = (-ENOSPC); | |
734 | } else { | |
735 | printk(KERN_ERR "%s: Error on flush.\n", | |
736 | tape_name(STp)); | |
737 | STps->drv_block = (-1); | |
738 | result = (-EIO); | |
739 | } | |
740 | } else { | |
741 | if (STps->drv_block >= 0) | |
742 | STps->drv_block += blks; | |
743 | STp->dirty = 0; | |
744 | (STp->buffer)->buffer_bytes = 0; | |
745 | } | |
8b05b773 | 746 | st_release_request(SRpnt); |
1da177e4 LT |
747 | SRpnt = NULL; |
748 | } | |
749 | return result; | |
750 | } | |
751 | ||
752 | ||
753 | /* Flush the tape buffer. The tape will be positioned correctly unless | |
754 | seek_next is true. */ | |
755 | static int flush_buffer(struct scsi_tape *STp, int seek_next) | |
756 | { | |
757 | int backspace, result; | |
758 | struct st_buffer *STbuffer; | |
759 | struct st_partstat *STps; | |
760 | ||
761 | STbuffer = STp->buffer; | |
762 | ||
763 | /* | |
764 | * If there was a bus reset, block further access | |
765 | * to this device. | |
766 | */ | |
767 | if (STp->pos_unknown) | |
768 | return (-EIO); | |
769 | ||
770 | if (STp->ready != ST_READY) | |
771 | return 0; | |
772 | STps = &(STp->ps[STp->partition]); | |
773 | if (STps->rw == ST_WRITING) /* Writing */ | |
8ef8d594 | 774 | return st_flush_write_buffer(STp); |
1da177e4 LT |
775 | |
776 | if (STp->block_size == 0) | |
777 | return 0; | |
778 | ||
779 | backspace = ((STp->buffer)->buffer_bytes + | |
780 | (STp->buffer)->read_pointer) / STp->block_size - | |
781 | ((STp->buffer)->read_pointer + STp->block_size - 1) / | |
782 | STp->block_size; | |
783 | (STp->buffer)->buffer_bytes = 0; | |
784 | (STp->buffer)->read_pointer = 0; | |
785 | result = 0; | |
786 | if (!seek_next) { | |
787 | if (STps->eof == ST_FM_HIT) { | |
788 | result = cross_eof(STp, 0); /* Back over the EOF hit */ | |
789 | if (!result) | |
790 | STps->eof = ST_NOEOF; | |
791 | else { | |
792 | if (STps->drv_file >= 0) | |
793 | STps->drv_file++; | |
794 | STps->drv_block = 0; | |
795 | } | |
796 | } | |
797 | if (!result && backspace > 0) | |
798 | result = st_int_ioctl(STp, MTBSR, backspace); | |
799 | } else if (STps->eof == ST_FM_HIT) { | |
800 | if (STps->drv_file >= 0) | |
801 | STps->drv_file++; | |
802 | STps->drv_block = 0; | |
803 | STps->eof = ST_NOEOF; | |
804 | } | |
805 | return result; | |
806 | ||
807 | } | |
808 | \f | |
809 | /* Set the mode parameters */ | |
810 | static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm) | |
811 | { | |
812 | int set_it = 0; | |
813 | unsigned long arg; | |
814 | char *name = tape_name(STp); | |
815 | ||
816 | if (!STp->density_changed && | |
817 | STm->default_density >= 0 && | |
818 | STm->default_density != STp->density) { | |
819 | arg = STm->default_density; | |
820 | set_it = 1; | |
821 | } else | |
822 | arg = STp->density; | |
823 | arg <<= MT_ST_DENSITY_SHIFT; | |
824 | if (!STp->blksize_changed && | |
825 | STm->default_blksize >= 0 && | |
826 | STm->default_blksize != STp->block_size) { | |
827 | arg |= STm->default_blksize; | |
828 | set_it = 1; | |
829 | } else | |
830 | arg |= STp->block_size; | |
831 | if (set_it && | |
832 | st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) { | |
833 | printk(KERN_WARNING | |
834 | "%s: Can't set default block size to %d bytes and density %x.\n", | |
835 | name, STm->default_blksize, STm->default_density); | |
836 | if (modes_defined) | |
837 | return (-EINVAL); | |
838 | } | |
839 | return 0; | |
840 | } | |
841 | ||
842 | ||
8b05b773 | 843 | /* Lock or unlock the drive door. Don't use when st_request allocated. */ |
1da177e4 LT |
844 | static int do_door_lock(struct scsi_tape * STp, int do_lock) |
845 | { | |
846 | int retval, cmd; | |
847 | DEB(char *name = tape_name(STp);) | |
848 | ||
849 | ||
850 | cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK; | |
851 | DEBC(printk(ST_DEB_MSG "%s: %socking drive door.\n", name, | |
852 | do_lock ? "L" : "Unl")); | |
853 | retval = scsi_ioctl(STp->device, cmd, NULL); | |
854 | if (!retval) { | |
855 | STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; | |
856 | } | |
857 | else { | |
858 | STp->door_locked = ST_LOCK_FAILS; | |
859 | } | |
860 | return retval; | |
861 | } | |
862 | ||
863 | ||
864 | /* Set the internal state after reset */ | |
865 | static void reset_state(struct scsi_tape *STp) | |
866 | { | |
867 | int i; | |
868 | struct st_partstat *STps; | |
869 | ||
870 | STp->pos_unknown = 0; | |
871 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
872 | STps = &(STp->ps[i]); | |
873 | STps->rw = ST_IDLE; | |
874 | STps->eof = ST_NOEOF; | |
875 | STps->at_sm = 0; | |
876 | STps->last_block_valid = 0; | |
877 | STps->drv_block = -1; | |
878 | STps->drv_file = -1; | |
879 | } | |
880 | if (STp->can_partitions) { | |
881 | STp->partition = find_partition(STp); | |
882 | if (STp->partition < 0) | |
883 | STp->partition = 0; | |
884 | STp->new_partition = STp->partition; | |
885 | } | |
886 | } | |
887 | \f | |
888 | /* Test if the drive is ready. Returns either one of the codes below or a negative system | |
889 | error code. */ | |
890 | #define CHKRES_READY 0 | |
891 | #define CHKRES_NEW_SESSION 1 | |
892 | #define CHKRES_NOT_READY 2 | |
893 | #define CHKRES_NO_TAPE 3 | |
894 | ||
895 | #define MAX_ATTENTIONS 10 | |
896 | ||
897 | static int test_ready(struct scsi_tape *STp, int do_wait) | |
898 | { | |
899 | int attentions, waits, max_wait, scode; | |
900 | int retval = CHKRES_READY, new_session = 0; | |
901 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
02ae2c0e | 902 | struct st_request *SRpnt = NULL; |
1da177e4 LT |
903 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; |
904 | ||
905 | max_wait = do_wait ? ST_BLOCK_SECONDS : 0; | |
906 | ||
907 | for (attentions=waits=0; ; ) { | |
908 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
909 | cmd[0] = TEST_UNIT_READY; | |
02ae2c0e KM |
910 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, |
911 | STp->long_timeout, MAX_READY_RETRIES, 1); | |
1da177e4 | 912 | |
02ae2c0e KM |
913 | if (!SRpnt) { |
914 | retval = (STp->buffer)->syscall_result; | |
1da177e4 | 915 | break; |
02ae2c0e | 916 | } |
1da177e4 LT |
917 | |
918 | if (cmdstatp->have_sense) { | |
919 | ||
920 | scode = cmdstatp->sense_hdr.sense_key; | |
921 | ||
922 | if (scode == UNIT_ATTENTION) { /* New media? */ | |
923 | new_session = 1; | |
924 | if (attentions < MAX_ATTENTIONS) { | |
925 | attentions++; | |
926 | continue; | |
927 | } | |
928 | else { | |
929 | retval = (-EIO); | |
930 | break; | |
931 | } | |
932 | } | |
933 | ||
934 | if (scode == NOT_READY) { | |
935 | if (waits < max_wait) { | |
936 | if (msleep_interruptible(1000)) { | |
937 | retval = (-EINTR); | |
938 | break; | |
939 | } | |
940 | waits++; | |
941 | continue; | |
942 | } | |
943 | else { | |
944 | if ((STp->device)->scsi_level >= SCSI_2 && | |
945 | cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */ | |
946 | retval = CHKRES_NO_TAPE; | |
947 | else | |
948 | retval = CHKRES_NOT_READY; | |
949 | break; | |
950 | } | |
951 | } | |
952 | } | |
953 | ||
954 | retval = (STp->buffer)->syscall_result; | |
955 | if (!retval) | |
956 | retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY; | |
957 | break; | |
958 | } | |
959 | ||
02ae2c0e KM |
960 | if (SRpnt != NULL) |
961 | st_release_request(SRpnt); | |
1da177e4 LT |
962 | return retval; |
963 | } | |
964 | ||
965 | ||
966 | /* See if the drive is ready and gather information about the tape. Return values: | |
967 | < 0 negative error code from errno.h | |
968 | 0 drive ready | |
969 | 1 drive not ready (possibly no tape) | |
970 | */ | |
971 | static int check_tape(struct scsi_tape *STp, struct file *filp) | |
972 | { | |
973 | int i, retval, new_session = 0, do_wait; | |
974 | unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning; | |
975 | unsigned short st_flags = filp->f_flags; | |
8b05b773 | 976 | struct st_request *SRpnt = NULL; |
1da177e4 LT |
977 | struct st_modedef *STm; |
978 | struct st_partstat *STps; | |
979 | char *name = tape_name(STp); | |
7ac6207b | 980 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
981 | int mode = TAPE_MODE(inode); |
982 | ||
983 | STp->ready = ST_READY; | |
984 | ||
985 | if (mode != STp->current_mode) { | |
986 | DEBC(printk(ST_DEB_MSG "%s: Mode change from %d to %d.\n", | |
987 | name, STp->current_mode, mode)); | |
988 | new_session = 1; | |
989 | STp->current_mode = mode; | |
990 | } | |
991 | STm = &(STp->modes[STp->current_mode]); | |
992 | ||
993 | saved_cleaning = STp->cleaning_req; | |
994 | STp->cleaning_req = 0; | |
995 | ||
996 | do_wait = ((filp->f_flags & O_NONBLOCK) == 0); | |
997 | retval = test_ready(STp, do_wait); | |
998 | ||
999 | if (retval < 0) | |
1000 | goto err_out; | |
1001 | ||
1002 | if (retval == CHKRES_NEW_SESSION) { | |
1003 | STp->pos_unknown = 0; | |
1004 | STp->partition = STp->new_partition = 0; | |
1005 | if (STp->can_partitions) | |
1006 | STp->nbr_partitions = 1; /* This guess will be updated later | |
1007 | if necessary */ | |
1008 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
1009 | STps = &(STp->ps[i]); | |
1010 | STps->rw = ST_IDLE; | |
1011 | STps->eof = ST_NOEOF; | |
1012 | STps->at_sm = 0; | |
1013 | STps->last_block_valid = 0; | |
1014 | STps->drv_block = 0; | |
1015 | STps->drv_file = 0; | |
1016 | } | |
1017 | new_session = 1; | |
1018 | } | |
1019 | else { | |
1020 | STp->cleaning_req |= saved_cleaning; | |
1021 | ||
1022 | if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) { | |
1023 | if (retval == CHKRES_NO_TAPE) | |
1024 | STp->ready = ST_NO_TAPE; | |
1025 | else | |
1026 | STp->ready = ST_NOT_READY; | |
1027 | ||
1028 | STp->density = 0; /* Clear the erroneous "residue" */ | |
1029 | STp->write_prot = 0; | |
1030 | STp->block_size = 0; | |
1031 | STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); | |
1032 | STp->partition = STp->new_partition = 0; | |
1033 | STp->door_locked = ST_UNLOCKED; | |
1034 | return CHKRES_NOT_READY; | |
1035 | } | |
1036 | } | |
1037 | ||
1038 | if (STp->omit_blklims) | |
1039 | STp->min_block = STp->max_block = (-1); | |
1040 | else { | |
1041 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
1042 | cmd[0] = READ_BLOCK_LIMITS; | |
1043 | ||
02ae2c0e KM |
1044 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, |
1045 | STp->device->request_queue->rq_timeout, | |
1046 | MAX_READY_RETRIES, 1); | |
1047 | if (!SRpnt) { | |
1048 | retval = (STp->buffer)->syscall_result; | |
1da177e4 LT |
1049 | goto err_out; |
1050 | } | |
1051 | ||
8b05b773 | 1052 | if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) { |
1da177e4 LT |
1053 | STp->max_block = ((STp->buffer)->b_data[1] << 16) | |
1054 | ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; | |
1055 | STp->min_block = ((STp->buffer)->b_data[4] << 8) | | |
1056 | (STp->buffer)->b_data[5]; | |
1057 | if ( DEB( debugging || ) !STp->inited) | |
42252854 | 1058 | printk(KERN_INFO |
1da177e4 LT |
1059 | "%s: Block limits %d - %d bytes.\n", name, |
1060 | STp->min_block, STp->max_block); | |
1061 | } else { | |
1062 | STp->min_block = STp->max_block = (-1); | |
1063 | DEBC(printk(ST_DEB_MSG "%s: Can't read block limits.\n", | |
1064 | name)); | |
1065 | } | |
1066 | } | |
1067 | ||
1068 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
1069 | cmd[0] = MODE_SENSE; | |
1070 | cmd[4] = 12; | |
1071 | ||
02ae2c0e KM |
1072 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, |
1073 | STp->device->request_queue->rq_timeout, | |
1074 | MAX_READY_RETRIES, 1); | |
1075 | if (!SRpnt) { | |
1076 | retval = (STp->buffer)->syscall_result; | |
1da177e4 LT |
1077 | goto err_out; |
1078 | } | |
1079 | ||
1080 | if ((STp->buffer)->syscall_result != 0) { | |
1081 | DEBC(printk(ST_DEB_MSG "%s: No Mode Sense.\n", name)); | |
1082 | STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ | |
1083 | (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ | |
1084 | STp->drv_write_prot = 0; | |
1085 | } else { | |
1086 | DEBC(printk(ST_DEB_MSG | |
1087 | "%s: Mode sense. Length %d, medium %x, WBS %x, BLL %d\n", | |
1088 | name, | |
1089 | (STp->buffer)->b_data[0], (STp->buffer)->b_data[1], | |
1090 | (STp->buffer)->b_data[2], (STp->buffer)->b_data[3])); | |
1091 | ||
1092 | if ((STp->buffer)->b_data[3] >= 8) { | |
1093 | STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; | |
1094 | STp->density = (STp->buffer)->b_data[4]; | |
1095 | STp->block_size = (STp->buffer)->b_data[9] * 65536 + | |
1096 | (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; | |
1097 | DEBC(printk(ST_DEB_MSG | |
1098 | "%s: Density %x, tape length: %x, drv buffer: %d\n", | |
1099 | name, STp->density, (STp->buffer)->b_data[5] * 65536 + | |
1100 | (STp->buffer)->b_data[6] * 256 + (STp->buffer)->b_data[7], | |
1101 | STp->drv_buffer)); | |
1102 | } | |
1103 | STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; | |
1104 | } | |
8b05b773 | 1105 | st_release_request(SRpnt); |
1da177e4 LT |
1106 | SRpnt = NULL; |
1107 | STp->inited = 1; | |
1108 | ||
1109 | if (STp->block_size > 0) | |
1110 | (STp->buffer)->buffer_blocks = | |
1111 | (STp->buffer)->buffer_size / STp->block_size; | |
1112 | else | |
1113 | (STp->buffer)->buffer_blocks = 1; | |
1114 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; | |
1115 | ||
1116 | DEBC(printk(ST_DEB_MSG | |
1117 | "%s: Block size: %d, buffer size: %d (%d blocks).\n", name, | |
1118 | STp->block_size, (STp->buffer)->buffer_size, | |
1119 | (STp->buffer)->buffer_blocks)); | |
1120 | ||
1121 | if (STp->drv_write_prot) { | |
1122 | STp->write_prot = 1; | |
1123 | ||
1124 | DEBC(printk(ST_DEB_MSG "%s: Write protected\n", name)); | |
1125 | ||
1126 | if (do_wait && | |
1127 | ((st_flags & O_ACCMODE) == O_WRONLY || | |
1128 | (st_flags & O_ACCMODE) == O_RDWR)) { | |
1129 | retval = (-EROFS); | |
1130 | goto err_out; | |
1131 | } | |
1132 | } | |
1133 | ||
1134 | if (STp->can_partitions && STp->nbr_partitions < 1) { | |
1135 | /* This code is reached when the device is opened for the first time | |
1136 | after the driver has been initialized with tape in the drive and the | |
1137 | partition support has been enabled. */ | |
1138 | DEBC(printk(ST_DEB_MSG | |
1139 | "%s: Updating partition number in status.\n", name)); | |
1140 | if ((STp->partition = find_partition(STp)) < 0) { | |
1141 | retval = STp->partition; | |
1142 | goto err_out; | |
1143 | } | |
1144 | STp->new_partition = STp->partition; | |
1145 | STp->nbr_partitions = 1; /* This guess will be updated when necessary */ | |
1146 | } | |
1147 | ||
1148 | if (new_session) { /* Change the drive parameters for the new mode */ | |
1149 | STp->density_changed = STp->blksize_changed = 0; | |
1150 | STp->compression_changed = 0; | |
1151 | if (!(STm->defaults_for_writes) && | |
1152 | (retval = set_mode_densblk(STp, STm)) < 0) | |
1153 | goto err_out; | |
1154 | ||
1155 | if (STp->default_drvbuffer != 0xff) { | |
1156 | if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer)) | |
1157 | printk(KERN_WARNING | |
1158 | "%s: Can't set default drive buffering to %d.\n", | |
1159 | name, STp->default_drvbuffer); | |
1160 | } | |
1161 | } | |
1162 | ||
1163 | return CHKRES_READY; | |
1164 | ||
1165 | err_out: | |
1166 | return retval; | |
1167 | } | |
1168 | ||
1169 | ||
b3369c68 | 1170 | \f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host |
1da177e4 LT |
1171 | module count. */ |
1172 | static int st_open(struct inode *inode, struct file *filp) | |
1173 | { | |
1174 | int i, retval = (-EIO); | |
1175 | struct scsi_tape *STp; | |
1176 | struct st_partstat *STps; | |
1177 | int dev = TAPE_NR(inode); | |
1178 | char *name; | |
1179 | ||
b3369c68 | 1180 | lock_kernel(); |
1da177e4 LT |
1181 | /* |
1182 | * We really want to do nonseekable_open(inode, filp); here, but some | |
1183 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
1184 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
1185 | */ | |
1186 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
1187 | ||
b3369c68 JC |
1188 | if (!(STp = scsi_tape_get(dev))) { |
1189 | unlock_kernel(); | |
f03a5670 | 1190 | return -ENXIO; |
b3369c68 | 1191 | } |
f03a5670 | 1192 | |
1da177e4 | 1193 | write_lock(&st_dev_arr_lock); |
1da177e4 LT |
1194 | filp->private_data = STp; |
1195 | name = tape_name(STp); | |
1196 | ||
1197 | if (STp->in_use) { | |
1198 | write_unlock(&st_dev_arr_lock); | |
f03a5670 | 1199 | scsi_tape_put(STp); |
b3369c68 | 1200 | unlock_kernel(); |
1da177e4 LT |
1201 | DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); ) |
1202 | return (-EBUSY); | |
1203 | } | |
1204 | ||
1da177e4 LT |
1205 | STp->in_use = 1; |
1206 | write_unlock(&st_dev_arr_lock); | |
1207 | STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; | |
1208 | ||
1209 | if (!scsi_block_when_processing_errors(STp->device)) { | |
1210 | retval = (-ENXIO); | |
1211 | goto err_out; | |
1212 | } | |
1213 | ||
1214 | /* See that we have at least a one page buffer available */ | |
1215 | if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) { | |
1216 | printk(KERN_WARNING "%s: Can't allocate one page tape buffer.\n", | |
1217 | name); | |
1218 | retval = (-EOVERFLOW); | |
1219 | goto err_out; | |
1220 | } | |
1221 | ||
40f6b36c | 1222 | (STp->buffer)->cleared = 0; |
1da177e4 LT |
1223 | (STp->buffer)->writing = 0; |
1224 | (STp->buffer)->syscall_result = 0; | |
1225 | ||
1226 | STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY); | |
1227 | ||
1228 | STp->dirty = 0; | |
1229 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
1230 | STps = &(STp->ps[i]); | |
1231 | STps->rw = ST_IDLE; | |
1232 | } | |
9abe16c6 | 1233 | STp->try_dio_now = STp->try_dio; |
1da177e4 LT |
1234 | STp->recover_count = 0; |
1235 | DEB( STp->nbr_waits = STp->nbr_finished = 0; | |
deee13df | 1236 | STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; ) |
1da177e4 LT |
1237 | |
1238 | retval = check_tape(STp, filp); | |
1239 | if (retval < 0) | |
1240 | goto err_out; | |
1241 | if ((filp->f_flags & O_NONBLOCK) == 0 && | |
1242 | retval != CHKRES_READY) { | |
413f7327 KM |
1243 | if (STp->ready == NO_TAPE) |
1244 | retval = (-ENOMEDIUM); | |
1245 | else | |
1246 | retval = (-EIO); | |
1da177e4 LT |
1247 | goto err_out; |
1248 | } | |
b3369c68 | 1249 | unlock_kernel(); |
1da177e4 LT |
1250 | return 0; |
1251 | ||
1252 | err_out: | |
1253 | normalize_buffer(STp->buffer); | |
1254 | STp->in_use = 0; | |
f03a5670 | 1255 | scsi_tape_put(STp); |
b3369c68 | 1256 | unlock_kernel(); |
1da177e4 LT |
1257 | return retval; |
1258 | ||
1259 | } | |
1260 | \f | |
1261 | ||
1262 | /* Flush the tape buffer before close */ | |
75e1fcc0 | 1263 | static int st_flush(struct file *filp, fl_owner_t id) |
1da177e4 LT |
1264 | { |
1265 | int result = 0, result2; | |
1266 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 1267 | struct st_request *SRpnt; |
1da177e4 LT |
1268 | struct scsi_tape *STp = filp->private_data; |
1269 | struct st_modedef *STm = &(STp->modes[STp->current_mode]); | |
1270 | struct st_partstat *STps = &(STp->ps[STp->partition]); | |
1271 | char *name = tape_name(STp); | |
1272 | ||
1273 | if (file_count(filp) > 1) | |
1274 | return 0; | |
1275 | ||
1276 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { | |
8ef8d594 | 1277 | result = st_flush_write_buffer(STp); |
1da177e4 LT |
1278 | if (result != 0 && result != (-ENOSPC)) |
1279 | goto out; | |
1280 | } | |
1281 | ||
1282 | if (STp->can_partitions && | |
1283 | (result2 = switch_partition(STp)) < 0) { | |
1284 | DEBC(printk(ST_DEB_MSG | |
1285 | "%s: switch_partition at close failed.\n", name)); | |
1286 | if (result == 0) | |
1287 | result = result2; | |
1288 | goto out; | |
1289 | } | |
1290 | ||
1291 | DEBC( if (STp->nbr_requests) | |
deee13df KM |
1292 | printk(KERN_DEBUG "%s: Number of r/w requests %d, dio used in %d, pages %d.\n", |
1293 | name, STp->nbr_requests, STp->nbr_dio, STp->nbr_pages)); | |
1da177e4 LT |
1294 | |
1295 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { | |
1296 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1297 | ||
1298 | DEBC(printk(ST_DEB_MSG "%s: Async write waits %d, finished %d.\n", | |
1299 | name, STp->nbr_waits, STp->nbr_finished); | |
1300 | ) | |
1301 | ||
1302 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1303 | cmd[0] = WRITE_FILEMARKS; | |
1304 | cmd[4] = 1 + STp->two_fm; | |
1305 | ||
02ae2c0e KM |
1306 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
1307 | STp->device->request_queue->rq_timeout, | |
1308 | MAX_WRITE_RETRIES, 1); | |
1da177e4 | 1309 | if (!SRpnt) { |
02ae2c0e | 1310 | result = (STp->buffer)->syscall_result; |
1da177e4 LT |
1311 | goto out; |
1312 | } | |
1313 | ||
1314 | if (STp->buffer->syscall_result == 0 || | |
1315 | (cmdstatp->have_sense && !cmdstatp->deferred && | |
1316 | (cmdstatp->flags & SENSE_EOM) && | |
1317 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
1318 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && | |
1319 | (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) { | |
1320 | /* Write successful at EOM */ | |
8b05b773 | 1321 | st_release_request(SRpnt); |
1da177e4 LT |
1322 | SRpnt = NULL; |
1323 | if (STps->drv_file >= 0) | |
1324 | STps->drv_file++; | |
1325 | STps->drv_block = 0; | |
1326 | if (STp->two_fm) | |
1327 | cross_eof(STp, 0); | |
1328 | STps->eof = ST_FM; | |
1329 | } | |
1330 | else { /* Write error */ | |
8b05b773 | 1331 | st_release_request(SRpnt); |
1da177e4 LT |
1332 | SRpnt = NULL; |
1333 | printk(KERN_ERR "%s: Error on write filemark.\n", name); | |
1334 | if (result == 0) | |
1335 | result = (-EIO); | |
1336 | } | |
1337 | ||
1338 | DEBC(printk(ST_DEB_MSG "%s: Buffer flushed, %d EOF(s) written\n", | |
1339 | name, cmd[4])); | |
1340 | } else if (!STp->rew_at_close) { | |
1341 | STps = &(STp->ps[STp->partition]); | |
1342 | if (!STm->sysv || STps->rw != ST_READING) { | |
1343 | if (STp->can_bsr) | |
1344 | result = flush_buffer(STp, 0); | |
1345 | else if (STps->eof == ST_FM_HIT) { | |
1346 | result = cross_eof(STp, 0); | |
1347 | if (result) { | |
1348 | if (STps->drv_file >= 0) | |
1349 | STps->drv_file++; | |
1350 | STps->drv_block = 0; | |
1351 | STps->eof = ST_FM; | |
1352 | } else | |
1353 | STps->eof = ST_NOEOF; | |
1354 | } | |
1355 | } else if ((STps->eof == ST_NOEOF && | |
1356 | !(result = cross_eof(STp, 1))) || | |
1357 | STps->eof == ST_FM_HIT) { | |
1358 | if (STps->drv_file >= 0) | |
1359 | STps->drv_file++; | |
1360 | STps->drv_block = 0; | |
1361 | STps->eof = ST_FM; | |
1362 | } | |
1363 | } | |
1364 | ||
1365 | out: | |
1366 | if (STp->rew_at_close) { | |
1367 | result2 = st_int_ioctl(STp, MTREW, 1); | |
1368 | if (result == 0) | |
1369 | result = result2; | |
1370 | } | |
1371 | return result; | |
1372 | } | |
1373 | ||
1374 | ||
1375 | /* Close the device and release it. BKL is not needed: this is the only thread | |
1376 | accessing this tape. */ | |
1377 | static int st_release(struct inode *inode, struct file *filp) | |
1378 | { | |
1379 | int result = 0; | |
1380 | struct scsi_tape *STp = filp->private_data; | |
1381 | ||
1382 | if (STp->door_locked == ST_LOCKED_AUTO) | |
1383 | do_door_lock(STp, 0); | |
1384 | ||
1385 | normalize_buffer(STp->buffer); | |
1386 | write_lock(&st_dev_arr_lock); | |
1387 | STp->in_use = 0; | |
1388 | write_unlock(&st_dev_arr_lock); | |
f03a5670 | 1389 | scsi_tape_put(STp); |
1da177e4 LT |
1390 | |
1391 | return result; | |
1392 | } | |
1393 | \f | |
1394 | /* The checks common to both reading and writing */ | |
1395 | static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count) | |
1396 | { | |
1397 | ssize_t retval = 0; | |
1398 | ||
1399 | /* | |
1400 | * If we are in the middle of error recovery, don't let anyone | |
1401 | * else try and use this device. Also, if error recovery fails, it | |
1402 | * may try and take the device offline, in which case all further | |
1403 | * access to the device is prohibited. | |
1404 | */ | |
1405 | if (!scsi_block_when_processing_errors(STp->device)) { | |
1406 | retval = (-ENXIO); | |
1407 | goto out; | |
1408 | } | |
1409 | ||
1410 | if (STp->ready != ST_READY) { | |
1411 | if (STp->ready == ST_NO_TAPE) | |
1412 | retval = (-ENOMEDIUM); | |
1413 | else | |
1414 | retval = (-EIO); | |
1415 | goto out; | |
1416 | } | |
1417 | ||
1418 | if (! STp->modes[STp->current_mode].defined) { | |
1419 | retval = (-ENXIO); | |
1420 | goto out; | |
1421 | } | |
1422 | ||
1423 | ||
1424 | /* | |
1425 | * If there was a bus reset, block further access | |
1426 | * to this device. | |
1427 | */ | |
1428 | if (STp->pos_unknown) { | |
1429 | retval = (-EIO); | |
1430 | goto out; | |
1431 | } | |
1432 | ||
1433 | if (count == 0) | |
1434 | goto out; | |
1435 | ||
1436 | DEB( | |
1437 | if (!STp->in_use) { | |
1438 | printk(ST_DEB_MSG "%s: Incorrect device.\n", tape_name(STp)); | |
1439 | retval = (-EIO); | |
1440 | goto out; | |
1441 | } ) /* end DEB */ | |
1442 | ||
1443 | if (STp->can_partitions && | |
1444 | (retval = switch_partition(STp)) < 0) | |
1445 | goto out; | |
1446 | ||
1447 | if (STp->block_size == 0 && STp->max_block > 0 && | |
1448 | (count < STp->min_block || count > STp->max_block)) { | |
1449 | retval = (-EINVAL); | |
1450 | goto out; | |
1451 | } | |
1452 | ||
1453 | if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && | |
1454 | !do_door_lock(STp, 1)) | |
1455 | STp->door_locked = ST_LOCKED_AUTO; | |
1456 | ||
1457 | out: | |
1458 | return retval; | |
1459 | } | |
1460 | ||
1461 | ||
1462 | static int setup_buffering(struct scsi_tape *STp, const char __user *buf, | |
1463 | size_t count, int is_read) | |
1464 | { | |
1465 | int i, bufsize, retval = 0; | |
1466 | struct st_buffer *STbp = STp->buffer; | |
1467 | ||
1468 | if (is_read) | |
9abe16c6 | 1469 | i = STp->try_dio_now && try_rdio; |
1da177e4 | 1470 | else |
9abe16c6 | 1471 | i = STp->try_dio_now && try_wdio; |
8b05b773 | 1472 | |
1da177e4 LT |
1473 | if (i && ((unsigned long)buf & queue_dma_alignment( |
1474 | STp->device->request_queue)) == 0) { | |
6620742f FT |
1475 | i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf, |
1476 | count, (is_read ? READ : WRITE)); | |
1da177e4 LT |
1477 | if (i > 0) { |
1478 | STbp->do_dio = i; | |
1479 | STbp->buffer_bytes = 0; /* can be used as transfer counter */ | |
1480 | } | |
1481 | else | |
1482 | STbp->do_dio = 0; /* fall back to buffering with any error */ | |
1483 | STbp->sg_segs = STbp->do_dio; | |
1da177e4 LT |
1484 | DEB( |
1485 | if (STbp->do_dio) { | |
1486 | STp->nbr_dio++; | |
1487 | STp->nbr_pages += STbp->do_dio; | |
1da177e4 LT |
1488 | } |
1489 | ) | |
1490 | } else | |
1491 | STbp->do_dio = 0; | |
1492 | DEB( STp->nbr_requests++; ) | |
1493 | ||
1494 | if (!STbp->do_dio) { | |
1495 | if (STp->block_size) | |
1496 | bufsize = STp->block_size > st_fixed_buffer_size ? | |
1497 | STp->block_size : st_fixed_buffer_size; | |
40f6b36c | 1498 | else { |
1da177e4 | 1499 | bufsize = count; |
40f6b36c KM |
1500 | /* Make sure that data from previous user is not leaked even if |
1501 | HBA does not return correct residual */ | |
1502 | if (is_read && STp->sili && !STbp->cleared) | |
1503 | clear_buffer(STbp); | |
1504 | } | |
1505 | ||
1da177e4 LT |
1506 | if (bufsize > STbp->buffer_size && |
1507 | !enlarge_buffer(STbp, bufsize, STp->restr_dma)) { | |
1508 | printk(KERN_WARNING "%s: Can't allocate %d byte tape buffer.\n", | |
1509 | tape_name(STp), bufsize); | |
1510 | retval = (-EOVERFLOW); | |
1511 | goto out; | |
1512 | } | |
1513 | if (STp->block_size) | |
1514 | STbp->buffer_blocks = bufsize / STp->block_size; | |
1515 | } | |
1516 | ||
1517 | out: | |
1518 | return retval; | |
1519 | } | |
1520 | ||
1521 | ||
1522 | /* Can be called more than once after each setup_buffer() */ | |
787926b1 | 1523 | static void release_buffering(struct scsi_tape *STp, int is_read) |
1da177e4 LT |
1524 | { |
1525 | struct st_buffer *STbp; | |
1526 | ||
1527 | STbp = STp->buffer; | |
1528 | if (STbp->do_dio) { | |
6620742f | 1529 | sgl_unmap_user_pages(STbp, STbp->do_dio, is_read); |
1da177e4 | 1530 | STbp->do_dio = 0; |
787926b1 | 1531 | STbp->sg_segs = 0; |
1da177e4 LT |
1532 | } |
1533 | } | |
1534 | ||
1535 | ||
1536 | /* Write command */ | |
1537 | static ssize_t | |
1538 | st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
1539 | { | |
1540 | ssize_t total; | |
1541 | ssize_t i, do_count, blks, transfer; | |
1542 | ssize_t retval; | |
1543 | int undone, retry_eot = 0, scode; | |
1544 | int async_write; | |
1545 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
1546 | const char __user *b_point; | |
8b05b773 | 1547 | struct st_request *SRpnt = NULL; |
1da177e4 LT |
1548 | struct scsi_tape *STp = filp->private_data; |
1549 | struct st_modedef *STm; | |
1550 | struct st_partstat *STps; | |
1551 | struct st_buffer *STbp; | |
1552 | char *name = tape_name(STp); | |
1553 | ||
28f85009 | 1554 | if (mutex_lock_interruptible(&STp->lock)) |
1da177e4 LT |
1555 | return -ERESTARTSYS; |
1556 | ||
1557 | retval = rw_checks(STp, filp, count); | |
1558 | if (retval || count == 0) | |
1559 | goto out; | |
1560 | ||
1561 | /* Write must be integral number of blocks */ | |
1562 | if (STp->block_size != 0 && (count % STp->block_size) != 0) { | |
1563 | printk(KERN_WARNING "%s: Write not multiple of tape block size.\n", | |
1564 | name); | |
1565 | retval = (-EINVAL); | |
1566 | goto out; | |
1567 | } | |
1568 | ||
1569 | STm = &(STp->modes[STp->current_mode]); | |
1570 | STps = &(STp->ps[STp->partition]); | |
1571 | ||
1572 | if (STp->write_prot) { | |
1573 | retval = (-EACCES); | |
1574 | goto out; | |
1575 | } | |
1576 | ||
1577 | ||
1578 | if (STps->rw == ST_READING) { | |
1579 | retval = flush_buffer(STp, 0); | |
1580 | if (retval) | |
1581 | goto out; | |
1582 | STps->rw = ST_WRITING; | |
1583 | } else if (STps->rw != ST_WRITING && | |
1584 | STps->drv_file == 0 && STps->drv_block == 0) { | |
1585 | if ((retval = set_mode_densblk(STp, STm)) < 0) | |
1586 | goto out; | |
1587 | if (STm->default_compression != ST_DONT_TOUCH && | |
1588 | !(STp->compression_changed)) { | |
1589 | if (st_compression(STp, (STm->default_compression == ST_YES))) { | |
1590 | printk(KERN_WARNING "%s: Can't set default compression.\n", | |
1591 | name); | |
1592 | if (modes_defined) { | |
1593 | retval = (-EINVAL); | |
1594 | goto out; | |
1595 | } | |
1596 | } | |
1597 | } | |
1598 | } | |
1599 | ||
1600 | STbp = STp->buffer; | |
1601 | i = write_behind_check(STp); | |
1602 | if (i) { | |
1603 | if (i == -ENOSPC) | |
1604 | STps->eof = ST_EOM_OK; | |
1605 | else | |
1606 | STps->eof = ST_EOM_ERROR; | |
1607 | } | |
1608 | ||
1609 | if (STps->eof == ST_EOM_OK) { | |
1610 | STps->eof = ST_EOD_1; /* allow next write */ | |
1611 | retval = (-ENOSPC); | |
1612 | goto out; | |
1613 | } | |
1614 | else if (STps->eof == ST_EOM_ERROR) { | |
1615 | retval = (-EIO); | |
1616 | goto out; | |
1617 | } | |
1618 | ||
1619 | /* Check the buffer readability in cases where copy_user might catch | |
1620 | the problems after some tape movement. */ | |
1621 | if (STp->block_size != 0 && | |
1622 | !STbp->do_dio && | |
1623 | (copy_from_user(&i, buf, 1) != 0 || | |
1624 | copy_from_user(&i, buf + count - 1, 1) != 0)) { | |
1625 | retval = (-EFAULT); | |
1626 | goto out; | |
1627 | } | |
1628 | ||
1629 | retval = setup_buffering(STp, buf, count, 0); | |
1630 | if (retval) | |
1631 | goto out; | |
1632 | ||
1633 | total = count; | |
1634 | ||
1635 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1636 | cmd[0] = WRITE_6; | |
1637 | cmd[1] = (STp->block_size != 0); | |
1638 | ||
1639 | STps->rw = ST_WRITING; | |
1640 | ||
1641 | b_point = buf; | |
1642 | while (count > 0 && !retry_eot) { | |
1643 | ||
1644 | if (STbp->do_dio) { | |
1645 | do_count = count; | |
1646 | } | |
1647 | else { | |
1648 | if (STp->block_size == 0) | |
1649 | do_count = count; | |
1650 | else { | |
1651 | do_count = STbp->buffer_blocks * STp->block_size - | |
1652 | STbp->buffer_bytes; | |
1653 | if (do_count > count) | |
1654 | do_count = count; | |
1655 | } | |
1656 | ||
1657 | i = append_to_buffer(b_point, STbp, do_count); | |
1658 | if (i) { | |
1659 | retval = i; | |
1660 | goto out; | |
1661 | } | |
1662 | } | |
1663 | count -= do_count; | |
1664 | b_point += do_count; | |
1665 | ||
1666 | async_write = STp->block_size == 0 && !STbp->do_dio && | |
1667 | STm->do_async_writes && STps->eof < ST_EOM_OK; | |
1668 | ||
1669 | if (STp->block_size != 0 && STm->do_buffer_writes && | |
9abe16c6 | 1670 | !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK && |
1da177e4 LT |
1671 | STbp->buffer_bytes < STbp->buffer_size) { |
1672 | STp->dirty = 1; | |
1673 | /* Don't write a buffer that is not full enough. */ | |
1674 | if (!async_write && count == 0) | |
1675 | break; | |
1676 | } | |
1677 | ||
1678 | retry_write: | |
1679 | if (STp->block_size == 0) | |
1680 | blks = transfer = do_count; | |
1681 | else { | |
1682 | if (!STbp->do_dio) | |
1683 | blks = STbp->buffer_bytes; | |
1684 | else | |
1685 | blks = do_count; | |
1686 | blks /= STp->block_size; | |
1687 | transfer = blks * STp->block_size; | |
1688 | } | |
1689 | cmd[2] = blks >> 16; | |
1690 | cmd[3] = blks >> 8; | |
1691 | cmd[4] = blks; | |
1692 | ||
1693 | SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE, | |
a02488ed JB |
1694 | STp->device->request_queue->rq_timeout, |
1695 | MAX_WRITE_RETRIES, !async_write); | |
1da177e4 LT |
1696 | if (!SRpnt) { |
1697 | retval = STbp->syscall_result; | |
1698 | goto out; | |
1699 | } | |
8b05b773 | 1700 | if (async_write && !STbp->syscall_result) { |
1da177e4 LT |
1701 | STbp->writing = transfer; |
1702 | STp->dirty = !(STbp->writing == | |
1703 | STbp->buffer_bytes); | |
1704 | SRpnt = NULL; /* Prevent releasing this request! */ | |
1705 | DEB( STp->write_pending = 1; ) | |
1706 | break; | |
1707 | } | |
1708 | ||
1709 | if (STbp->syscall_result != 0) { | |
1710 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1711 | ||
1712 | DEBC(printk(ST_DEB_MSG "%s: Error on write:\n", name)); | |
1713 | if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) { | |
1714 | scode = cmdstatp->sense_hdr.sense_key; | |
1715 | if (cmdstatp->remainder_valid) | |
1716 | undone = (int)cmdstatp->uremainder64; | |
1717 | else if (STp->block_size == 0 && | |
1718 | scode == VOLUME_OVERFLOW) | |
1719 | undone = transfer; | |
1720 | else | |
1721 | undone = 0; | |
1722 | if (STp->block_size != 0) | |
1723 | undone *= STp->block_size; | |
1724 | if (undone <= do_count) { | |
1725 | /* Only data from this write is not written */ | |
1726 | count += undone; | |
626dcb1e | 1727 | b_point -= undone; |
1da177e4 LT |
1728 | do_count -= undone; |
1729 | if (STp->block_size) | |
1730 | blks = (transfer - undone) / STp->block_size; | |
1731 | STps->eof = ST_EOM_OK; | |
1732 | /* Continue in fixed block mode if all written | |
1733 | in this request but still something left to write | |
1734 | (retval left to zero) | |
1735 | */ | |
1736 | if (STp->block_size == 0 || | |
1737 | undone > 0 || count == 0) | |
1738 | retval = (-ENOSPC); /* EOM within current request */ | |
1739 | DEBC(printk(ST_DEB_MSG | |
1740 | "%s: EOM with %d bytes unwritten.\n", | |
1741 | name, (int)count)); | |
1742 | } else { | |
1743 | /* EOT within data buffered earlier (possible only | |
1744 | in fixed block mode without direct i/o) */ | |
1745 | if (!retry_eot && !cmdstatp->deferred && | |
1746 | (scode == NO_SENSE || scode == RECOVERED_ERROR)) { | |
1747 | move_buffer_data(STp->buffer, transfer - undone); | |
1748 | retry_eot = 1; | |
1749 | if (STps->drv_block >= 0) { | |
1750 | STps->drv_block += (transfer - undone) / | |
1751 | STp->block_size; | |
1752 | } | |
1753 | STps->eof = ST_EOM_OK; | |
1754 | DEBC(printk(ST_DEB_MSG | |
1755 | "%s: Retry write of %d bytes at EOM.\n", | |
1756 | name, STp->buffer->buffer_bytes)); | |
1757 | goto retry_write; | |
1758 | } | |
1759 | else { | |
1760 | /* Either error within data buffered by driver or | |
1761 | failed retry */ | |
1762 | count -= do_count; | |
1763 | blks = do_count = 0; | |
1764 | STps->eof = ST_EOM_ERROR; | |
1765 | STps->drv_block = (-1); /* Too cautious? */ | |
1766 | retval = (-EIO); /* EOM for old data */ | |
1767 | DEBC(printk(ST_DEB_MSG | |
1768 | "%s: EOM with lost data.\n", | |
1769 | name)); | |
1770 | } | |
1771 | } | |
1772 | } else { | |
1773 | count += do_count; | |
1774 | STps->drv_block = (-1); /* Too cautious? */ | |
8b05b773 | 1775 | retval = STbp->syscall_result; |
1da177e4 LT |
1776 | } |
1777 | ||
1778 | } | |
1779 | ||
1780 | if (STps->drv_block >= 0) { | |
1781 | if (STp->block_size == 0) | |
1782 | STps->drv_block += (do_count > 0); | |
1783 | else | |
1784 | STps->drv_block += blks; | |
1785 | } | |
1786 | ||
1787 | STbp->buffer_bytes = 0; | |
1788 | STp->dirty = 0; | |
1789 | ||
1790 | if (retval || retry_eot) { | |
1791 | if (count < total) | |
1792 | retval = total - count; | |
1793 | goto out; | |
1794 | } | |
1795 | } | |
1796 | ||
1797 | if (STps->eof == ST_EOD_1) | |
1798 | STps->eof = ST_EOM_OK; | |
1799 | else if (STps->eof != ST_EOM_OK) | |
1800 | STps->eof = ST_NOEOF; | |
1801 | retval = total - count; | |
1802 | ||
1803 | out: | |
1804 | if (SRpnt != NULL) | |
8b05b773 | 1805 | st_release_request(SRpnt); |
787926b1 | 1806 | release_buffering(STp, 0); |
28f85009 | 1807 | mutex_unlock(&STp->lock); |
1da177e4 LT |
1808 | |
1809 | return retval; | |
1810 | } | |
1811 | \f | |
1812 | /* Read data from the tape. Returns zero in the normal case, one if the | |
1813 | eof status has changed, and the negative error code in case of a | |
1814 | fatal error. Otherwise updates the buffer and the eof state. | |
1815 | ||
1816 | Does release user buffer mapping if it is set. | |
1817 | */ | |
1818 | static long read_tape(struct scsi_tape *STp, long count, | |
8b05b773 | 1819 | struct st_request ** aSRpnt) |
1da177e4 LT |
1820 | { |
1821 | int transfer, blks, bytes; | |
1822 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 1823 | struct st_request *SRpnt; |
1da177e4 LT |
1824 | struct st_modedef *STm; |
1825 | struct st_partstat *STps; | |
1826 | struct st_buffer *STbp; | |
1827 | int retval = 0; | |
1828 | char *name = tape_name(STp); | |
1829 | ||
1830 | if (count == 0) | |
1831 | return 0; | |
1832 | ||
1833 | STm = &(STp->modes[STp->current_mode]); | |
1834 | STps = &(STp->ps[STp->partition]); | |
1835 | if (STps->eof == ST_FM_HIT) | |
1836 | return 1; | |
1837 | STbp = STp->buffer; | |
1838 | ||
1839 | if (STp->block_size == 0) | |
1840 | blks = bytes = count; | |
1841 | else { | |
9abe16c6 | 1842 | if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) { |
1da177e4 LT |
1843 | blks = (STp->buffer)->buffer_blocks; |
1844 | bytes = blks * STp->block_size; | |
1845 | } else { | |
1846 | bytes = count; | |
1847 | if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size) | |
1848 | bytes = (STp->buffer)->buffer_size; | |
1849 | blks = bytes / STp->block_size; | |
1850 | bytes = blks * STp->block_size; | |
1851 | } | |
1852 | } | |
1853 | ||
1854 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1855 | cmd[0] = READ_6; | |
1856 | cmd[1] = (STp->block_size != 0); | |
40f6b36c KM |
1857 | if (!cmd[1] && STp->sili) |
1858 | cmd[1] |= 2; | |
1da177e4 LT |
1859 | cmd[2] = blks >> 16; |
1860 | cmd[3] = blks >> 8; | |
1861 | cmd[4] = blks; | |
1862 | ||
1863 | SRpnt = *aSRpnt; | |
1864 | SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE, | |
a02488ed JB |
1865 | STp->device->request_queue->rq_timeout, |
1866 | MAX_RETRIES, 1); | |
787926b1 | 1867 | release_buffering(STp, 1); |
1da177e4 LT |
1868 | *aSRpnt = SRpnt; |
1869 | if (!SRpnt) | |
1870 | return STbp->syscall_result; | |
1871 | ||
1872 | STbp->read_pointer = 0; | |
1873 | STps->at_sm = 0; | |
1874 | ||
1875 | /* Something to check */ | |
1876 | if (STbp->syscall_result) { | |
1877 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1878 | ||
1879 | retval = 1; | |
1880 | DEBC(printk(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", | |
1881 | name, | |
8b05b773 MC |
1882 | SRpnt->sense[0], SRpnt->sense[1], |
1883 | SRpnt->sense[2], SRpnt->sense[3], | |
1884 | SRpnt->sense[4], SRpnt->sense[5], | |
1885 | SRpnt->sense[6], SRpnt->sense[7])); | |
1da177e4 LT |
1886 | if (cmdstatp->have_sense) { |
1887 | ||
1888 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) | |
1889 | cmdstatp->flags &= 0xcf; /* No need for EOM in this case */ | |
1890 | ||
1891 | if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */ | |
1892 | /* Compute the residual count */ | |
1893 | if (cmdstatp->remainder_valid) | |
1894 | transfer = (int)cmdstatp->uremainder64; | |
1895 | else | |
1896 | transfer = 0; | |
1897 | if (STp->block_size == 0 && | |
1898 | cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) | |
1899 | transfer = bytes; | |
1900 | ||
1901 | if (cmdstatp->flags & SENSE_ILI) { /* ILI */ | |
1902 | if (STp->block_size == 0) { | |
1903 | if (transfer <= 0) { | |
1904 | if (transfer < 0) | |
1905 | printk(KERN_NOTICE | |
1906 | "%s: Failed to read %d byte block with %d byte transfer.\n", | |
1907 | name, bytes - transfer, bytes); | |
1908 | if (STps->drv_block >= 0) | |
1909 | STps->drv_block += 1; | |
1910 | STbp->buffer_bytes = 0; | |
1911 | return (-ENOMEM); | |
1912 | } | |
1913 | STbp->buffer_bytes = bytes - transfer; | |
1914 | } else { | |
8b05b773 | 1915 | st_release_request(SRpnt); |
1da177e4 LT |
1916 | SRpnt = *aSRpnt = NULL; |
1917 | if (transfer == blks) { /* We did not get anything, error */ | |
1918 | printk(KERN_NOTICE "%s: Incorrect block size.\n", name); | |
1919 | if (STps->drv_block >= 0) | |
1920 | STps->drv_block += blks - transfer + 1; | |
1921 | st_int_ioctl(STp, MTBSR, 1); | |
1922 | return (-EIO); | |
1923 | } | |
1924 | /* We have some data, deliver it */ | |
1925 | STbp->buffer_bytes = (blks - transfer) * | |
1926 | STp->block_size; | |
1927 | DEBC(printk(ST_DEB_MSG | |
1928 | "%s: ILI but enough data received %ld %d.\n", | |
1929 | name, count, STbp->buffer_bytes)); | |
1930 | if (STps->drv_block >= 0) | |
1931 | STps->drv_block += 1; | |
1932 | if (st_int_ioctl(STp, MTBSR, 1)) | |
1933 | return (-EIO); | |
1934 | } | |
1935 | } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */ | |
1936 | if (STps->eof != ST_FM_HIT) | |
1937 | STps->eof = ST_FM_HIT; | |
1938 | else | |
1939 | STps->eof = ST_EOD_2; | |
1940 | if (STp->block_size == 0) | |
1941 | STbp->buffer_bytes = 0; | |
1942 | else | |
1943 | STbp->buffer_bytes = | |
1944 | bytes - transfer * STp->block_size; | |
1945 | DEBC(printk(ST_DEB_MSG | |
1946 | "%s: EOF detected (%d bytes read).\n", | |
1947 | name, STbp->buffer_bytes)); | |
1948 | } else if (cmdstatp->flags & SENSE_EOM) { | |
1949 | if (STps->eof == ST_FM) | |
1950 | STps->eof = ST_EOD_1; | |
1951 | else | |
1952 | STps->eof = ST_EOM_OK; | |
1953 | if (STp->block_size == 0) | |
1954 | STbp->buffer_bytes = bytes - transfer; | |
1955 | else | |
1956 | STbp->buffer_bytes = | |
1957 | bytes - transfer * STp->block_size; | |
1958 | ||
1959 | DEBC(printk(ST_DEB_MSG "%s: EOM detected (%d bytes read).\n", | |
1960 | name, STbp->buffer_bytes)); | |
1961 | } | |
1962 | } | |
1963 | /* end of EOF, EOM, ILI test */ | |
1964 | else { /* nonzero sense key */ | |
1965 | DEBC(printk(ST_DEB_MSG | |
1966 | "%s: Tape error while reading.\n", name)); | |
1967 | STps->drv_block = (-1); | |
1968 | if (STps->eof == ST_FM && | |
1969 | cmdstatp->sense_hdr.sense_key == BLANK_CHECK) { | |
1970 | DEBC(printk(ST_DEB_MSG | |
1971 | "%s: Zero returned for first BLANK CHECK after EOF.\n", | |
1972 | name)); | |
1973 | STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */ | |
1974 | } else /* Some other extended sense code */ | |
1975 | retval = (-EIO); | |
1976 | } | |
1977 | ||
1978 | if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */ | |
1979 | STbp->buffer_bytes = 0; | |
1980 | } | |
1981 | /* End of extended sense test */ | |
1982 | else { /* Non-extended sense */ | |
1983 | retval = STbp->syscall_result; | |
1984 | } | |
1985 | ||
1986 | } | |
1987 | /* End of error handling */ | |
40f6b36c | 1988 | else { /* Read successful */ |
1da177e4 | 1989 | STbp->buffer_bytes = bytes; |
40f6b36c KM |
1990 | if (STp->sili) /* In fixed block mode residual is always zero here */ |
1991 | STbp->buffer_bytes -= STp->buffer->cmdstat.residual; | |
1992 | } | |
1da177e4 LT |
1993 | |
1994 | if (STps->drv_block >= 0) { | |
1995 | if (STp->block_size == 0) | |
1996 | STps->drv_block++; | |
1997 | else | |
1998 | STps->drv_block += STbp->buffer_bytes / STp->block_size; | |
1999 | } | |
2000 | return retval; | |
2001 | } | |
2002 | \f | |
2003 | ||
2004 | /* Read command */ | |
2005 | static ssize_t | |
2006 | st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
2007 | { | |
2008 | ssize_t total; | |
2009 | ssize_t retval = 0; | |
2010 | ssize_t i, transfer; | |
2011 | int special, do_dio = 0; | |
8b05b773 | 2012 | struct st_request *SRpnt = NULL; |
1da177e4 LT |
2013 | struct scsi_tape *STp = filp->private_data; |
2014 | struct st_modedef *STm; | |
2015 | struct st_partstat *STps; | |
2016 | struct st_buffer *STbp = STp->buffer; | |
2017 | DEB( char *name = tape_name(STp); ) | |
2018 | ||
28f85009 | 2019 | if (mutex_lock_interruptible(&STp->lock)) |
1da177e4 LT |
2020 | return -ERESTARTSYS; |
2021 | ||
2022 | retval = rw_checks(STp, filp, count); | |
2023 | if (retval || count == 0) | |
2024 | goto out; | |
2025 | ||
2026 | STm = &(STp->modes[STp->current_mode]); | |
9abe16c6 KM |
2027 | if (STp->block_size != 0 && (count % STp->block_size) != 0) { |
2028 | if (!STm->do_read_ahead) { | |
2029 | retval = (-EINVAL); /* Read must be integral number of blocks */ | |
2030 | goto out; | |
2031 | } | |
2032 | STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */ | |
1da177e4 LT |
2033 | } |
2034 | ||
2035 | STps = &(STp->ps[STp->partition]); | |
2036 | if (STps->rw == ST_WRITING) { | |
2037 | retval = flush_buffer(STp, 0); | |
2038 | if (retval) | |
2039 | goto out; | |
2040 | STps->rw = ST_READING; | |
2041 | } | |
2042 | DEB( | |
2043 | if (debugging && STps->eof != ST_NOEOF) | |
2044 | printk(ST_DEB_MSG "%s: EOF/EOM flag up (%d). Bytes %d\n", name, | |
2045 | STps->eof, STbp->buffer_bytes); | |
2046 | ) /* end DEB */ | |
2047 | ||
2048 | retval = setup_buffering(STp, buf, count, 1); | |
2049 | if (retval) | |
2050 | goto out; | |
2051 | do_dio = STbp->do_dio; | |
2052 | ||
2053 | if (STbp->buffer_bytes == 0 && | |
2054 | STps->eof >= ST_EOD_1) { | |
2055 | if (STps->eof < ST_EOD) { | |
2056 | STps->eof += 1; | |
2057 | retval = 0; | |
2058 | goto out; | |
2059 | } | |
2060 | retval = (-EIO); /* EOM or Blank Check */ | |
2061 | goto out; | |
2062 | } | |
2063 | ||
2064 | if (do_dio) { | |
2065 | /* Check the buffer writability before any tape movement. Don't alter | |
2066 | buffer data. */ | |
2067 | if (copy_from_user(&i, buf, 1) != 0 || | |
2068 | copy_to_user(buf, &i, 1) != 0 || | |
2069 | copy_from_user(&i, buf + count - 1, 1) != 0 || | |
2070 | copy_to_user(buf + count - 1, &i, 1) != 0) { | |
2071 | retval = (-EFAULT); | |
2072 | goto out; | |
2073 | } | |
2074 | } | |
2075 | ||
2076 | STps->rw = ST_READING; | |
2077 | ||
2078 | ||
2079 | /* Loop until enough data in buffer or a special condition found */ | |
2080 | for (total = 0, special = 0; total < count && !special;) { | |
2081 | ||
2082 | /* Get new data if the buffer is empty */ | |
2083 | if (STbp->buffer_bytes == 0) { | |
2084 | special = read_tape(STp, count - total, &SRpnt); | |
2085 | if (special < 0) { /* No need to continue read */ | |
2086 | retval = special; | |
2087 | goto out; | |
2088 | } | |
2089 | } | |
2090 | ||
2091 | /* Move the data from driver buffer to user buffer */ | |
2092 | if (STbp->buffer_bytes > 0) { | |
2093 | DEB( | |
2094 | if (debugging && STps->eof != ST_NOEOF) | |
2095 | printk(ST_DEB_MSG | |
2096 | "%s: EOF up (%d). Left %d, needed %d.\n", name, | |
2097 | STps->eof, STbp->buffer_bytes, | |
2098 | (int)(count - total)); | |
2099 | ) /* end DEB */ | |
2100 | transfer = STbp->buffer_bytes < count - total ? | |
2101 | STbp->buffer_bytes : count - total; | |
2102 | if (!do_dio) { | |
2103 | i = from_buffer(STbp, buf, transfer); | |
2104 | if (i) { | |
2105 | retval = i; | |
2106 | goto out; | |
2107 | } | |
2108 | } | |
2109 | buf += transfer; | |
2110 | total += transfer; | |
2111 | } | |
2112 | ||
2113 | if (STp->block_size == 0) | |
2114 | break; /* Read only one variable length block */ | |
2115 | ||
2116 | } /* for (total = 0, special = 0; | |
2117 | total < count && !special; ) */ | |
2118 | ||
2119 | /* Change the eof state if no data from tape or buffer */ | |
2120 | if (total == 0) { | |
2121 | if (STps->eof == ST_FM_HIT) { | |
2122 | STps->eof = ST_FM; | |
2123 | STps->drv_block = 0; | |
2124 | if (STps->drv_file >= 0) | |
2125 | STps->drv_file++; | |
2126 | } else if (STps->eof == ST_EOD_1) { | |
2127 | STps->eof = ST_EOD_2; | |
2128 | STps->drv_block = 0; | |
2129 | if (STps->drv_file >= 0) | |
2130 | STps->drv_file++; | |
2131 | } else if (STps->eof == ST_EOD_2) | |
2132 | STps->eof = ST_EOD; | |
2133 | } else if (STps->eof == ST_FM) | |
2134 | STps->eof = ST_NOEOF; | |
2135 | retval = total; | |
2136 | ||
2137 | out: | |
2138 | if (SRpnt != NULL) { | |
8b05b773 | 2139 | st_release_request(SRpnt); |
1da177e4 LT |
2140 | SRpnt = NULL; |
2141 | } | |
2142 | if (do_dio) { | |
787926b1 | 2143 | release_buffering(STp, 1); |
1da177e4 LT |
2144 | STbp->buffer_bytes = 0; |
2145 | } | |
28f85009 | 2146 | mutex_unlock(&STp->lock); |
1da177e4 LT |
2147 | |
2148 | return retval; | |
2149 | } | |
2150 | \f | |
2151 | ||
2152 | ||
2153 | DEB( | |
2154 | /* Set the driver options */ | |
2155 | static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm, char *name) | |
2156 | { | |
2157 | if (debugging) { | |
2158 | printk(KERN_INFO | |
2159 | "%s: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n", | |
2160 | name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes, | |
2161 | STm->do_read_ahead); | |
2162 | printk(KERN_INFO | |
2163 | "%s: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n", | |
2164 | name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock); | |
2165 | printk(KERN_INFO | |
2166 | "%s: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n", | |
2167 | name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions, | |
2168 | STp->scsi2_logical); | |
2169 | printk(KERN_INFO | |
40f6b36c KM |
2170 | "%s: sysv: %d nowait: %d sili: %d\n", name, STm->sysv, STp->immediate, |
2171 | STp->sili); | |
1da177e4 LT |
2172 | printk(KERN_INFO "%s: debugging: %d\n", |
2173 | name, debugging); | |
2174 | } | |
2175 | } | |
2176 | ) | |
2177 | ||
2178 | ||
2179 | static int st_set_options(struct scsi_tape *STp, long options) | |
2180 | { | |
2181 | int value; | |
2182 | long code; | |
2183 | struct st_modedef *STm; | |
2184 | char *name = tape_name(STp); | |
2185 | struct cdev *cd0, *cd1; | |
2186 | ||
2187 | STm = &(STp->modes[STp->current_mode]); | |
2188 | if (!STm->defined) { | |
2189 | cd0 = STm->cdevs[0]; cd1 = STm->cdevs[1]; | |
2190 | memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); | |
2191 | STm->cdevs[0] = cd0; STm->cdevs[1] = cd1; | |
2192 | modes_defined = 1; | |
2193 | DEBC(printk(ST_DEB_MSG | |
2194 | "%s: Initialized mode %d definition from mode 0\n", | |
2195 | name, STp->current_mode)); | |
2196 | } | |
2197 | ||
2198 | code = options & MT_ST_OPTIONS; | |
2199 | if (code == MT_ST_BOOLEANS) { | |
2200 | STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; | |
2201 | STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; | |
2202 | STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; | |
2203 | STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; | |
2204 | STp->two_fm = (options & MT_ST_TWO_FM) != 0; | |
2205 | STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; | |
2206 | STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; | |
2207 | STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; | |
2208 | STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; | |
2209 | if ((STp->device)->scsi_level >= SCSI_2) | |
2210 | STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; | |
2211 | STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; | |
2212 | STp->immediate = (options & MT_ST_NOWAIT) != 0; | |
2213 | STm->sysv = (options & MT_ST_SYSV) != 0; | |
40f6b36c | 2214 | STp->sili = (options & MT_ST_SILI) != 0; |
1da177e4 LT |
2215 | DEB( debugging = (options & MT_ST_DEBUGGING) != 0; |
2216 | st_log_options(STp, STm, name); ) | |
2217 | } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { | |
2218 | value = (code == MT_ST_SETBOOLEANS); | |
2219 | if ((options & MT_ST_BUFFER_WRITES) != 0) | |
2220 | STm->do_buffer_writes = value; | |
2221 | if ((options & MT_ST_ASYNC_WRITES) != 0) | |
2222 | STm->do_async_writes = value; | |
2223 | if ((options & MT_ST_DEF_WRITES) != 0) | |
2224 | STm->defaults_for_writes = value; | |
2225 | if ((options & MT_ST_READ_AHEAD) != 0) | |
2226 | STm->do_read_ahead = value; | |
2227 | if ((options & MT_ST_TWO_FM) != 0) | |
2228 | STp->two_fm = value; | |
2229 | if ((options & MT_ST_FAST_MTEOM) != 0) | |
2230 | STp->fast_mteom = value; | |
2231 | if ((options & MT_ST_AUTO_LOCK) != 0) | |
2232 | STp->do_auto_lock = value; | |
2233 | if ((options & MT_ST_CAN_BSR) != 0) | |
2234 | STp->can_bsr = value; | |
2235 | if ((options & MT_ST_NO_BLKLIMS) != 0) | |
2236 | STp->omit_blklims = value; | |
2237 | if ((STp->device)->scsi_level >= SCSI_2 && | |
2238 | (options & MT_ST_CAN_PARTITIONS) != 0) | |
2239 | STp->can_partitions = value; | |
2240 | if ((options & MT_ST_SCSI2LOGICAL) != 0) | |
2241 | STp->scsi2_logical = value; | |
2242 | if ((options & MT_ST_NOWAIT) != 0) | |
2243 | STp->immediate = value; | |
2244 | if ((options & MT_ST_SYSV) != 0) | |
2245 | STm->sysv = value; | |
40f6b36c KM |
2246 | if ((options & MT_ST_SILI) != 0) |
2247 | STp->sili = value; | |
1da177e4 LT |
2248 | DEB( |
2249 | if ((options & MT_ST_DEBUGGING) != 0) | |
2250 | debugging = value; | |
2251 | st_log_options(STp, STm, name); ) | |
2252 | } else if (code == MT_ST_WRITE_THRESHOLD) { | |
2253 | /* Retained for compatibility */ | |
2254 | } else if (code == MT_ST_DEF_BLKSIZE) { | |
2255 | value = (options & ~MT_ST_OPTIONS); | |
2256 | if (value == ~MT_ST_OPTIONS) { | |
2257 | STm->default_blksize = (-1); | |
2258 | DEBC( printk(KERN_INFO "%s: Default block size disabled.\n", name)); | |
2259 | } else { | |
2260 | STm->default_blksize = value; | |
2261 | DEBC( printk(KERN_INFO "%s: Default block size set to %d bytes.\n", | |
2262 | name, STm->default_blksize)); | |
2263 | if (STp->ready == ST_READY) { | |
2264 | STp->blksize_changed = 0; | |
2265 | set_mode_densblk(STp, STm); | |
2266 | } | |
2267 | } | |
2268 | } else if (code == MT_ST_TIMEOUTS) { | |
2269 | value = (options & ~MT_ST_OPTIONS); | |
2270 | if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { | |
2271 | STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; | |
2272 | DEBC( printk(KERN_INFO "%s: Long timeout set to %d seconds.\n", name, | |
2273 | (value & ~MT_ST_SET_LONG_TIMEOUT))); | |
2274 | } else { | |
a02488ed JB |
2275 | blk_queue_rq_timeout(STp->device->request_queue, |
2276 | value * HZ); | |
1da177e4 LT |
2277 | DEBC( printk(KERN_INFO "%s: Normal timeout set to %d seconds.\n", |
2278 | name, value) ); | |
2279 | } | |
2280 | } else if (code == MT_ST_SET_CLN) { | |
2281 | value = (options & ~MT_ST_OPTIONS) & 0xff; | |
2282 | if (value != 0 && | |
2283 | value < EXTENDED_SENSE_START && value >= SCSI_SENSE_BUFFERSIZE) | |
2284 | return (-EINVAL); | |
2285 | STp->cln_mode = value; | |
2286 | STp->cln_sense_mask = (options >> 8) & 0xff; | |
2287 | STp->cln_sense_value = (options >> 16) & 0xff; | |
2288 | printk(KERN_INFO | |
2289 | "%s: Cleaning request mode %d, mask %02x, value %02x\n", | |
2290 | name, value, STp->cln_sense_mask, STp->cln_sense_value); | |
2291 | } else if (code == MT_ST_DEF_OPTIONS) { | |
2292 | code = (options & ~MT_ST_CLEAR_DEFAULT); | |
2293 | value = (options & MT_ST_CLEAR_DEFAULT); | |
2294 | if (code == MT_ST_DEF_DENSITY) { | |
2295 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2296 | STm->default_density = (-1); | |
2297 | DEBC( printk(KERN_INFO "%s: Density default disabled.\n", | |
2298 | name)); | |
2299 | } else { | |
2300 | STm->default_density = value & 0xff; | |
2301 | DEBC( printk(KERN_INFO "%s: Density default set to %x\n", | |
2302 | name, STm->default_density)); | |
2303 | if (STp->ready == ST_READY) { | |
2304 | STp->density_changed = 0; | |
2305 | set_mode_densblk(STp, STm); | |
2306 | } | |
2307 | } | |
2308 | } else if (code == MT_ST_DEF_DRVBUFFER) { | |
2309 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2310 | STp->default_drvbuffer = 0xff; | |
2311 | DEBC( printk(KERN_INFO | |
2312 | "%s: Drive buffer default disabled.\n", name)); | |
2313 | } else { | |
2314 | STp->default_drvbuffer = value & 7; | |
2315 | DEBC( printk(KERN_INFO | |
2316 | "%s: Drive buffer default set to %x\n", | |
2317 | name, STp->default_drvbuffer)); | |
2318 | if (STp->ready == ST_READY) | |
2319 | st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer); | |
2320 | } | |
2321 | } else if (code == MT_ST_DEF_COMPRESSION) { | |
2322 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2323 | STm->default_compression = ST_DONT_TOUCH; | |
2324 | DEBC( printk(KERN_INFO | |
2325 | "%s: Compression default disabled.\n", name)); | |
2326 | } else { | |
2327 | if ((value & 0xff00) != 0) { | |
2328 | STp->c_algo = (value & 0xff00) >> 8; | |
2329 | DEBC( printk(KERN_INFO "%s: Compression algorithm set to 0x%x.\n", | |
2330 | name, STp->c_algo)); | |
2331 | } | |
2332 | if ((value & 0xff) != 0xff) { | |
2333 | STm->default_compression = (value & 1 ? ST_YES : ST_NO); | |
2334 | DEBC( printk(KERN_INFO "%s: Compression default set to %x\n", | |
2335 | name, (value & 1))); | |
2336 | if (STp->ready == ST_READY) { | |
2337 | STp->compression_changed = 0; | |
2338 | st_compression(STp, (STm->default_compression == ST_YES)); | |
2339 | } | |
2340 | } | |
2341 | } | |
2342 | } | |
2343 | } else | |
2344 | return (-EIO); | |
2345 | ||
2346 | return 0; | |
2347 | } | |
2348 | \f | |
2349 | #define MODE_HEADER_LENGTH 4 | |
2350 | ||
2351 | /* Mode header and page byte offsets */ | |
2352 | #define MH_OFF_DATA_LENGTH 0 | |
2353 | #define MH_OFF_MEDIUM_TYPE 1 | |
2354 | #define MH_OFF_DEV_SPECIFIC 2 | |
2355 | #define MH_OFF_BDESCS_LENGTH 3 | |
2356 | #define MP_OFF_PAGE_NBR 0 | |
2357 | #define MP_OFF_PAGE_LENGTH 1 | |
2358 | ||
2359 | /* Mode header and page bit masks */ | |
2360 | #define MH_BIT_WP 0x80 | |
2361 | #define MP_MSK_PAGE_NBR 0x3f | |
2362 | ||
2363 | /* Don't return block descriptors */ | |
2364 | #define MODE_SENSE_OMIT_BDESCS 0x08 | |
2365 | ||
2366 | #define MODE_SELECT_PAGE_FORMAT 0x10 | |
2367 | ||
2368 | /* Read a mode page into the tape buffer. The block descriptors are included | |
2369 | if incl_block_descs is true. The page control is ored to the page number | |
2370 | parameter, if necessary. */ | |
2371 | static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) | |
2372 | { | |
2373 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8ecf0d99 | 2374 | struct st_request *SRpnt; |
1da177e4 LT |
2375 | |
2376 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2377 | cmd[0] = MODE_SENSE; | |
2378 | if (omit_block_descs) | |
2379 | cmd[1] = MODE_SENSE_OMIT_BDESCS; | |
2380 | cmd[2] = page; | |
2381 | cmd[4] = 255; | |
2382 | ||
02ae2c0e KM |
2383 | SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE, |
2384 | STp->device->request_queue->rq_timeout, 0, 1); | |
2385 | if (SRpnt == NULL) | |
2386 | return (STp->buffer)->syscall_result; | |
1da177e4 | 2387 | |
8b05b773 | 2388 | st_release_request(SRpnt); |
1da177e4 | 2389 | |
02ae2c0e | 2390 | return STp->buffer->syscall_result; |
1da177e4 LT |
2391 | } |
2392 | ||
2393 | ||
2394 | /* Send the mode page in the tape buffer to the drive. Assumes that the mode data | |
2395 | in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ | |
2396 | static int write_mode_page(struct scsi_tape *STp, int page, int slow) | |
2397 | { | |
02ae2c0e | 2398 | int pgo; |
1da177e4 | 2399 | unsigned char cmd[MAX_COMMAND_SIZE]; |
18c87015 | 2400 | struct st_request *SRpnt; |
02ae2c0e | 2401 | int timeout; |
1da177e4 LT |
2402 | |
2403 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2404 | cmd[0] = MODE_SELECT; | |
2405 | cmd[1] = MODE_SELECT_PAGE_FORMAT; | |
2406 | pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH]; | |
2407 | cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2; | |
2408 | ||
2409 | /* Clear reserved fields */ | |
2410 | (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0; | |
2411 | (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0; | |
2412 | (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; | |
2413 | (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; | |
2414 | ||
02ae2c0e KM |
2415 | timeout = slow ? |
2416 | STp->long_timeout : STp->device->request_queue->rq_timeout; | |
2417 | SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE, | |
2418 | timeout, 0, 1); | |
2419 | if (SRpnt == NULL) | |
2420 | return (STp->buffer)->syscall_result; | |
1da177e4 | 2421 | |
8b05b773 | 2422 | st_release_request(SRpnt); |
1da177e4 | 2423 | |
02ae2c0e | 2424 | return STp->buffer->syscall_result; |
1da177e4 LT |
2425 | } |
2426 | ||
2427 | ||
2428 | #define COMPRESSION_PAGE 0x0f | |
2429 | #define COMPRESSION_PAGE_LENGTH 16 | |
2430 | ||
2431 | #define CP_OFF_DCE_DCC 2 | |
2432 | #define CP_OFF_C_ALGO 7 | |
2433 | ||
2434 | #define DCE_MASK 0x80 | |
2435 | #define DCC_MASK 0x40 | |
2436 | #define RED_MASK 0x60 | |
2437 | ||
2438 | ||
2439 | /* Control the compression with mode page 15. Algorithm not changed if zero. | |
2440 | ||
2441 | The block descriptors are read and written because Sony SDT-7000 does not | |
2442 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). | |
2443 | Including block descriptors should not cause any harm to other drives. */ | |
2444 | ||
2445 | static int st_compression(struct scsi_tape * STp, int state) | |
2446 | { | |
2447 | int retval; | |
2448 | int mpoffs; /* Offset to mode page start */ | |
2449 | unsigned char *b_data = (STp->buffer)->b_data; | |
2450 | DEB( char *name = tape_name(STp); ) | |
2451 | ||
2452 | if (STp->ready != ST_READY) | |
2453 | return (-EIO); | |
2454 | ||
2455 | /* Read the current page contents */ | |
2456 | retval = read_mode_page(STp, COMPRESSION_PAGE, 0); | |
2457 | if (retval) { | |
2458 | DEBC(printk(ST_DEB_MSG "%s: Compression mode page not supported.\n", | |
2459 | name)); | |
2460 | return (-EIO); | |
2461 | } | |
2462 | ||
2463 | mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; | |
2464 | DEBC(printk(ST_DEB_MSG "%s: Compression state is %d.\n", name, | |
2465 | (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0))); | |
2466 | ||
2467 | /* Check if compression can be changed */ | |
2468 | if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) { | |
2469 | DEBC(printk(ST_DEB_MSG "%s: Compression not supported.\n", name)); | |
2470 | return (-EIO); | |
2471 | } | |
2472 | ||
2473 | /* Do the change */ | |
2474 | if (state) { | |
2475 | b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK; | |
2476 | if (STp->c_algo != 0) | |
2477 | b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo; | |
2478 | } | |
2479 | else { | |
2480 | b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK; | |
2481 | if (STp->c_algo != 0) | |
2482 | b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */ | |
2483 | } | |
2484 | ||
2485 | retval = write_mode_page(STp, COMPRESSION_PAGE, 0); | |
2486 | if (retval) { | |
2487 | DEBC(printk(ST_DEB_MSG "%s: Compression change failed.\n", name)); | |
2488 | return (-EIO); | |
2489 | } | |
2490 | DEBC(printk(ST_DEB_MSG "%s: Compression state changed to %d.\n", | |
2491 | name, state)); | |
2492 | ||
2493 | STp->compression_changed = 1; | |
2494 | return 0; | |
2495 | } | |
2496 | ||
2497 | ||
2498 | /* Process the load and unload commands (does unload if the load code is zero) */ | |
2499 | static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code) | |
2500 | { | |
2501 | int retval = (-EIO), timeout; | |
2502 | DEB( char *name = tape_name(STp); ) | |
2503 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
2504 | struct st_partstat *STps; | |
8b05b773 | 2505 | struct st_request *SRpnt; |
1da177e4 LT |
2506 | |
2507 | if (STp->ready != ST_READY && !load_code) { | |
2508 | if (STp->ready == ST_NO_TAPE) | |
2509 | return (-ENOMEDIUM); | |
2510 | else | |
2511 | return (-EIO); | |
2512 | } | |
2513 | ||
2514 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2515 | cmd[0] = START_STOP; | |
2516 | if (load_code) | |
2517 | cmd[4] |= 1; | |
2518 | /* | |
2519 | * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A | |
2520 | */ | |
2521 | if (load_code >= 1 + MT_ST_HPLOADER_OFFSET | |
2522 | && load_code <= 6 + MT_ST_HPLOADER_OFFSET) { | |
2523 | DEBC(printk(ST_DEB_MSG "%s: Enhanced %sload slot %2d.\n", | |
2524 | name, (cmd[4]) ? "" : "un", | |
2525 | load_code - MT_ST_HPLOADER_OFFSET)); | |
2526 | cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ | |
2527 | } | |
2528 | if (STp->immediate) { | |
2529 | cmd[1] = 1; /* Don't wait for completion */ | |
a02488ed | 2530 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
2531 | } |
2532 | else | |
2533 | timeout = STp->long_timeout; | |
2534 | ||
2535 | DEBC( | |
2536 | if (!load_code) | |
2537 | printk(ST_DEB_MSG "%s: Unloading tape.\n", name); | |
2538 | else | |
2539 | printk(ST_DEB_MSG "%s: Loading tape.\n", name); | |
2540 | ); | |
2541 | ||
02ae2c0e KM |
2542 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
2543 | timeout, MAX_RETRIES, 1); | |
1da177e4 | 2544 | if (!SRpnt) |
02ae2c0e | 2545 | return (STp->buffer)->syscall_result; |
1da177e4 LT |
2546 | |
2547 | retval = (STp->buffer)->syscall_result; | |
02ae2c0e | 2548 | st_release_request(SRpnt); |
1da177e4 LT |
2549 | |
2550 | if (!retval) { /* SCSI command successful */ | |
2551 | ||
2552 | if (!load_code) { | |
2553 | STp->rew_at_close = 0; | |
2554 | STp->ready = ST_NO_TAPE; | |
2555 | } | |
2556 | else { | |
2557 | STp->rew_at_close = STp->autorew_dev; | |
2558 | retval = check_tape(STp, filp); | |
2559 | if (retval > 0) | |
2560 | retval = 0; | |
2561 | } | |
2562 | } | |
2563 | else { | |
2564 | STps = &(STp->ps[STp->partition]); | |
2565 | STps->drv_file = STps->drv_block = (-1); | |
2566 | } | |
2567 | ||
2568 | return retval; | |
2569 | } | |
2570 | \f | |
2571 | #if DEBUG | |
2572 | #define ST_DEB_FORWARD 0 | |
2573 | #define ST_DEB_BACKWARD 1 | |
2574 | static void deb_space_print(char *name, int direction, char *units, unsigned char *cmd) | |
2575 | { | |
2576 | s32 sc; | |
2577 | ||
2578 | sc = cmd[2] & 0x80 ? 0xff000000 : 0; | |
2579 | sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; | |
2580 | if (direction) | |
2581 | sc = -sc; | |
2582 | printk(ST_DEB_MSG "%s: Spacing tape %s over %d %s.\n", name, | |
2583 | direction ? "backward" : "forward", sc, units); | |
2584 | } | |
2585 | #endif | |
2586 | ||
2587 | ||
2588 | /* Internal ioctl function */ | |
2589 | static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) | |
2590 | { | |
2591 | int timeout; | |
2592 | long ltmp; | |
2593 | int ioctl_result; | |
2594 | int chg_eof = 1; | |
2595 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 2596 | struct st_request *SRpnt; |
1da177e4 LT |
2597 | struct st_partstat *STps; |
2598 | int fileno, blkno, at_sm, undone; | |
2599 | int datalen = 0, direction = DMA_NONE; | |
2600 | char *name = tape_name(STp); | |
2601 | ||
2602 | WARN_ON(STp->buffer->do_dio != 0); | |
2603 | if (STp->ready != ST_READY) { | |
2604 | if (STp->ready == ST_NO_TAPE) | |
2605 | return (-ENOMEDIUM); | |
2606 | else | |
2607 | return (-EIO); | |
2608 | } | |
2609 | timeout = STp->long_timeout; | |
2610 | STps = &(STp->ps[STp->partition]); | |
2611 | fileno = STps->drv_file; | |
2612 | blkno = STps->drv_block; | |
2613 | at_sm = STps->at_sm; | |
2614 | ||
2615 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2616 | switch (cmd_in) { | |
2617 | case MTFSFM: | |
2618 | chg_eof = 0; /* Changed from the FSF after this */ | |
2619 | case MTFSF: | |
2620 | cmd[0] = SPACE; | |
2621 | cmd[1] = 0x01; /* Space FileMarks */ | |
2622 | cmd[2] = (arg >> 16); | |
2623 | cmd[3] = (arg >> 8); | |
2624 | cmd[4] = arg; | |
2625 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "filemarks", cmd);) | |
2626 | if (fileno >= 0) | |
2627 | fileno += arg; | |
2628 | blkno = 0; | |
2629 | at_sm &= (arg == 0); | |
2630 | break; | |
2631 | case MTBSFM: | |
2632 | chg_eof = 0; /* Changed from the FSF after this */ | |
2633 | case MTBSF: | |
2634 | cmd[0] = SPACE; | |
2635 | cmd[1] = 0x01; /* Space FileMarks */ | |
2636 | ltmp = (-arg); | |
2637 | cmd[2] = (ltmp >> 16); | |
2638 | cmd[3] = (ltmp >> 8); | |
2639 | cmd[4] = ltmp; | |
2640 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "filemarks", cmd);) | |
2641 | if (fileno >= 0) | |
2642 | fileno -= arg; | |
2643 | blkno = (-1); /* We can't know the block number */ | |
2644 | at_sm &= (arg == 0); | |
2645 | break; | |
2646 | case MTFSR: | |
2647 | cmd[0] = SPACE; | |
2648 | cmd[1] = 0x00; /* Space Blocks */ | |
2649 | cmd[2] = (arg >> 16); | |
2650 | cmd[3] = (arg >> 8); | |
2651 | cmd[4] = arg; | |
2652 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "blocks", cmd);) | |
2653 | if (blkno >= 0) | |
2654 | blkno += arg; | |
2655 | at_sm &= (arg == 0); | |
2656 | break; | |
2657 | case MTBSR: | |
2658 | cmd[0] = SPACE; | |
2659 | cmd[1] = 0x00; /* Space Blocks */ | |
2660 | ltmp = (-arg); | |
2661 | cmd[2] = (ltmp >> 16); | |
2662 | cmd[3] = (ltmp >> 8); | |
2663 | cmd[4] = ltmp; | |
2664 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "blocks", cmd);) | |
2665 | if (blkno >= 0) | |
2666 | blkno -= arg; | |
2667 | at_sm &= (arg == 0); | |
2668 | break; | |
2669 | case MTFSS: | |
2670 | cmd[0] = SPACE; | |
2671 | cmd[1] = 0x04; /* Space Setmarks */ | |
2672 | cmd[2] = (arg >> 16); | |
2673 | cmd[3] = (arg >> 8); | |
2674 | cmd[4] = arg; | |
2675 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "setmarks", cmd);) | |
2676 | if (arg != 0) { | |
2677 | blkno = fileno = (-1); | |
2678 | at_sm = 1; | |
2679 | } | |
2680 | break; | |
2681 | case MTBSS: | |
2682 | cmd[0] = SPACE; | |
2683 | cmd[1] = 0x04; /* Space Setmarks */ | |
2684 | ltmp = (-arg); | |
2685 | cmd[2] = (ltmp >> 16); | |
2686 | cmd[3] = (ltmp >> 8); | |
2687 | cmd[4] = ltmp; | |
2688 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "setmarks", cmd);) | |
2689 | if (arg != 0) { | |
2690 | blkno = fileno = (-1); | |
2691 | at_sm = 1; | |
2692 | } | |
2693 | break; | |
2694 | case MTWEOF: | |
2695 | case MTWSM: | |
2696 | if (STp->write_prot) | |
2697 | return (-EACCES); | |
2698 | cmd[0] = WRITE_FILEMARKS; | |
2699 | if (cmd_in == MTWSM) | |
2700 | cmd[1] = 2; | |
2701 | cmd[2] = (arg >> 16); | |
2702 | cmd[3] = (arg >> 8); | |
2703 | cmd[4] = arg; | |
a02488ed | 2704 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
2705 | DEBC( |
2706 | if (cmd_in == MTWEOF) | |
2707 | printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name, | |
2708 | cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); | |
2709 | else | |
2710 | printk(ST_DEB_MSG "%s: Writing %d setmarks.\n", name, | |
2711 | cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); | |
2712 | ) | |
2713 | if (fileno >= 0) | |
2714 | fileno += arg; | |
2715 | blkno = 0; | |
2716 | at_sm = (cmd_in == MTWSM); | |
2717 | break; | |
2718 | case MTREW: | |
2719 | cmd[0] = REZERO_UNIT; | |
2720 | if (STp->immediate) { | |
2721 | cmd[1] = 1; /* Don't wait for completion */ | |
a02488ed | 2722 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
2723 | } |
2724 | DEBC(printk(ST_DEB_MSG "%s: Rewinding tape.\n", name)); | |
2725 | fileno = blkno = at_sm = 0; | |
2726 | break; | |
2727 | case MTNOP: | |
2728 | DEBC(printk(ST_DEB_MSG "%s: No op on tape.\n", name)); | |
2729 | return 0; /* Should do something ? */ | |
2730 | break; | |
2731 | case MTRETEN: | |
2732 | cmd[0] = START_STOP; | |
2733 | if (STp->immediate) { | |
2734 | cmd[1] = 1; /* Don't wait for completion */ | |
a02488ed | 2735 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
2736 | } |
2737 | cmd[4] = 3; | |
2738 | DEBC(printk(ST_DEB_MSG "%s: Retensioning tape.\n", name)); | |
2739 | fileno = blkno = at_sm = 0; | |
2740 | break; | |
2741 | case MTEOM: | |
2742 | if (!STp->fast_mteom) { | |
2743 | /* space to the end of tape */ | |
2744 | ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); | |
2745 | fileno = STps->drv_file; | |
2746 | if (STps->eof >= ST_EOD_1) | |
2747 | return 0; | |
2748 | /* The next lines would hide the number of spaced FileMarks | |
2749 | That's why I inserted the previous lines. I had no luck | |
2750 | with detecting EOM with FSF, so we go now to EOM. | |
2751 | Joerg Weule */ | |
2752 | } else | |
2753 | fileno = (-1); | |
2754 | cmd[0] = SPACE; | |
2755 | cmd[1] = 3; | |
2756 | DEBC(printk(ST_DEB_MSG "%s: Spacing to end of recorded medium.\n", | |
2757 | name)); | |
2758 | blkno = -1; | |
2759 | at_sm = 0; | |
2760 | break; | |
2761 | case MTERASE: | |
2762 | if (STp->write_prot) | |
2763 | return (-EACCES); | |
2764 | cmd[0] = ERASE; | |
2765 | cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ | |
2766 | if (STp->immediate) { | |
2767 | cmd[1] |= 2; /* Don't wait for completion */ | |
a02488ed | 2768 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
2769 | } |
2770 | else | |
2771 | timeout = STp->long_timeout * 8; | |
2772 | ||
2773 | DEBC(printk(ST_DEB_MSG "%s: Erasing tape.\n", name)); | |
2774 | fileno = blkno = at_sm = 0; | |
2775 | break; | |
2776 | case MTSETBLK: /* Set block length */ | |
2777 | case MTSETDENSITY: /* Set tape density */ | |
2778 | case MTSETDRVBUFFER: /* Set drive buffering */ | |
2779 | case SET_DENS_AND_BLK: /* Set density and block size */ | |
2780 | chg_eof = 0; | |
2781 | if (STp->dirty || (STp->buffer)->buffer_bytes != 0) | |
2782 | return (-EIO); /* Not allowed if data in buffer */ | |
2783 | if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && | |
2784 | (arg & MT_ST_BLKSIZE_MASK) != 0 && | |
2785 | STp->max_block > 0 && | |
2786 | ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || | |
2787 | (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { | |
2788 | printk(KERN_WARNING "%s: Illegal block size.\n", name); | |
2789 | return (-EINVAL); | |
2790 | } | |
2791 | cmd[0] = MODE_SELECT; | |
2792 | if ((STp->use_pf & USE_PF)) | |
2793 | cmd[1] = MODE_SELECT_PAGE_FORMAT; | |
2794 | cmd[4] = datalen = 12; | |
2795 | direction = DMA_TO_DEVICE; | |
2796 | ||
2797 | memset((STp->buffer)->b_data, 0, 12); | |
2798 | if (cmd_in == MTSETDRVBUFFER) | |
2799 | (STp->buffer)->b_data[2] = (arg & 7) << 4; | |
2800 | else | |
2801 | (STp->buffer)->b_data[2] = | |
2802 | STp->drv_buffer << 4; | |
2803 | (STp->buffer)->b_data[3] = 8; /* block descriptor length */ | |
2804 | if (cmd_in == MTSETDENSITY) { | |
2805 | (STp->buffer)->b_data[4] = arg; | |
2806 | STp->density_changed = 1; /* At least we tried ;-) */ | |
2807 | } else if (cmd_in == SET_DENS_AND_BLK) | |
2808 | (STp->buffer)->b_data[4] = arg >> 24; | |
2809 | else | |
2810 | (STp->buffer)->b_data[4] = STp->density; | |
2811 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { | |
2812 | ltmp = arg & MT_ST_BLKSIZE_MASK; | |
2813 | if (cmd_in == MTSETBLK) | |
2814 | STp->blksize_changed = 1; /* At least we tried ;-) */ | |
2815 | } else | |
2816 | ltmp = STp->block_size; | |
2817 | (STp->buffer)->b_data[9] = (ltmp >> 16); | |
2818 | (STp->buffer)->b_data[10] = (ltmp >> 8); | |
2819 | (STp->buffer)->b_data[11] = ltmp; | |
a02488ed | 2820 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
2821 | DEBC( |
2822 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) | |
2823 | printk(ST_DEB_MSG | |
2824 | "%s: Setting block size to %d bytes.\n", name, | |
2825 | (STp->buffer)->b_data[9] * 65536 + | |
2826 | (STp->buffer)->b_data[10] * 256 + | |
2827 | (STp->buffer)->b_data[11]); | |
2828 | if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) | |
2829 | printk(ST_DEB_MSG | |
2830 | "%s: Setting density code to %x.\n", name, | |
2831 | (STp->buffer)->b_data[4]); | |
2832 | if (cmd_in == MTSETDRVBUFFER) | |
2833 | printk(ST_DEB_MSG | |
2834 | "%s: Setting drive buffer code to %d.\n", name, | |
2835 | ((STp->buffer)->b_data[2] >> 4) & 7); | |
2836 | ) | |
2837 | break; | |
2838 | default: | |
2839 | return (-ENOSYS); | |
2840 | } | |
2841 | ||
02ae2c0e KM |
2842 | SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, |
2843 | timeout, MAX_RETRIES, 1); | |
1da177e4 LT |
2844 | if (!SRpnt) |
2845 | return (STp->buffer)->syscall_result; | |
2846 | ||
02ae2c0e | 2847 | ioctl_result = (STp->buffer)->syscall_result; |
1da177e4 LT |
2848 | |
2849 | if (!ioctl_result) { /* SCSI command successful */ | |
8b05b773 | 2850 | st_release_request(SRpnt); |
1da177e4 LT |
2851 | SRpnt = NULL; |
2852 | STps->drv_block = blkno; | |
2853 | STps->drv_file = fileno; | |
2854 | STps->at_sm = at_sm; | |
2855 | ||
2856 | if (cmd_in == MTBSFM) | |
2857 | ioctl_result = st_int_ioctl(STp, MTFSF, 1); | |
2858 | else if (cmd_in == MTFSFM) | |
2859 | ioctl_result = st_int_ioctl(STp, MTBSF, 1); | |
2860 | ||
2861 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { | |
2862 | int old_block_size = STp->block_size; | |
2863 | STp->block_size = arg & MT_ST_BLKSIZE_MASK; | |
2864 | if (STp->block_size != 0) { | |
2865 | if (old_block_size == 0) | |
2866 | normalize_buffer(STp->buffer); | |
2867 | (STp->buffer)->buffer_blocks = | |
2868 | (STp->buffer)->buffer_size / STp->block_size; | |
2869 | } | |
2870 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; | |
2871 | if (cmd_in == SET_DENS_AND_BLK) | |
2872 | STp->density = arg >> MT_ST_DENSITY_SHIFT; | |
2873 | } else if (cmd_in == MTSETDRVBUFFER) | |
2874 | STp->drv_buffer = (arg & 7); | |
2875 | else if (cmd_in == MTSETDENSITY) | |
2876 | STp->density = arg; | |
2877 | ||
2878 | if (cmd_in == MTEOM) | |
2879 | STps->eof = ST_EOD; | |
2880 | else if (cmd_in == MTFSF) | |
2881 | STps->eof = ST_FM; | |
2882 | else if (chg_eof) | |
2883 | STps->eof = ST_NOEOF; | |
2884 | ||
2885 | if (cmd_in == MTWEOF) | |
2886 | STps->rw = ST_IDLE; | |
2887 | } else { /* SCSI command was not completely successful. Don't return | |
2888 | from this block without releasing the SCSI command block! */ | |
2889 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
2890 | ||
2891 | if (cmdstatp->flags & SENSE_EOM) { | |
2892 | if (cmd_in != MTBSF && cmd_in != MTBSFM && | |
2893 | cmd_in != MTBSR && cmd_in != MTBSS) | |
2894 | STps->eof = ST_EOM_OK; | |
2895 | STps->drv_block = 0; | |
2896 | } | |
2897 | ||
2898 | if (cmdstatp->remainder_valid) | |
2899 | undone = (int)cmdstatp->uremainder64; | |
2900 | else | |
2901 | undone = 0; | |
2902 | ||
2903 | if (cmd_in == MTWEOF && | |
2904 | cmdstatp->have_sense && | |
91614c05 KM |
2905 | (cmdstatp->flags & SENSE_EOM)) { |
2906 | if (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
2907 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { | |
2908 | ioctl_result = 0; /* EOF(s) written successfully at EOM */ | |
2909 | STps->eof = ST_NOEOF; | |
2910 | } else { /* Writing EOF(s) failed */ | |
2911 | if (fileno >= 0) | |
2912 | fileno -= undone; | |
2913 | if (undone < arg) | |
2914 | STps->eof = ST_NOEOF; | |
2915 | } | |
1da177e4 | 2916 | STps->drv_file = fileno; |
1da177e4 LT |
2917 | } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { |
2918 | if (fileno >= 0) | |
2919 | STps->drv_file = fileno - undone; | |
2920 | else | |
2921 | STps->drv_file = fileno; | |
2922 | STps->drv_block = -1; | |
2923 | STps->eof = ST_NOEOF; | |
2924 | } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { | |
2925 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ | |
2926 | undone = (-undone); | |
2927 | if (STps->drv_file >= 0) | |
2928 | STps->drv_file = fileno + undone; | |
2929 | STps->drv_block = 0; | |
2930 | STps->eof = ST_NOEOF; | |
2931 | } else if (cmd_in == MTFSR) { | |
2932 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ | |
2933 | if (STps->drv_file >= 0) | |
2934 | STps->drv_file++; | |
2935 | STps->drv_block = 0; | |
2936 | STps->eof = ST_FM; | |
2937 | } else { | |
2938 | if (blkno >= undone) | |
2939 | STps->drv_block = blkno - undone; | |
2940 | else | |
2941 | STps->drv_block = (-1); | |
2942 | STps->eof = ST_NOEOF; | |
2943 | } | |
2944 | } else if (cmd_in == MTBSR) { | |
2945 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ | |
2946 | STps->drv_file--; | |
2947 | STps->drv_block = (-1); | |
2948 | } else { | |
2949 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ | |
2950 | undone = (-undone); | |
2951 | if (STps->drv_block >= 0) | |
2952 | STps->drv_block = blkno + undone; | |
2953 | } | |
2954 | STps->eof = ST_NOEOF; | |
2955 | } else if (cmd_in == MTEOM) { | |
2956 | STps->drv_file = (-1); | |
2957 | STps->drv_block = (-1); | |
2958 | STps->eof = ST_EOD; | |
2959 | } else if (cmd_in == MTSETBLK || | |
2960 | cmd_in == MTSETDENSITY || | |
2961 | cmd_in == MTSETDRVBUFFER || | |
2962 | cmd_in == SET_DENS_AND_BLK) { | |
2963 | if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && | |
2964 | !(STp->use_pf & PF_TESTED)) { | |
2965 | /* Try the other possible state of Page Format if not | |
2966 | already tried */ | |
2967 | STp->use_pf = !STp->use_pf | PF_TESTED; | |
8b05b773 | 2968 | st_release_request(SRpnt); |
1da177e4 LT |
2969 | SRpnt = NULL; |
2970 | return st_int_ioctl(STp, cmd_in, arg); | |
2971 | } | |
2972 | } else if (chg_eof) | |
2973 | STps->eof = ST_NOEOF; | |
2974 | ||
2975 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) | |
2976 | STps->eof = ST_EOD; | |
2977 | ||
8b05b773 | 2978 | st_release_request(SRpnt); |
1da177e4 LT |
2979 | SRpnt = NULL; |
2980 | } | |
2981 | ||
2982 | return ioctl_result; | |
2983 | } | |
2984 | \f | |
2985 | ||
2986 | /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc | |
2987 | structure. */ | |
2988 | ||
2989 | static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, | |
2990 | int logical) | |
2991 | { | |
2992 | int result; | |
2993 | unsigned char scmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 2994 | struct st_request *SRpnt; |
1da177e4 LT |
2995 | DEB( char *name = tape_name(STp); ) |
2996 | ||
2997 | if (STp->ready != ST_READY) | |
2998 | return (-EIO); | |
2999 | ||
3000 | memset(scmd, 0, MAX_COMMAND_SIZE); | |
3001 | if ((STp->device)->scsi_level < SCSI_2) { | |
3002 | scmd[0] = QFA_REQUEST_BLOCK; | |
3003 | scmd[4] = 3; | |
3004 | } else { | |
3005 | scmd[0] = READ_POSITION; | |
3006 | if (!logical && !STp->scsi2_logical) | |
3007 | scmd[1] = 1; | |
3008 | } | |
02ae2c0e KM |
3009 | SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, |
3010 | STp->device->request_queue->rq_timeout, | |
3011 | MAX_READY_RETRIES, 1); | |
1da177e4 | 3012 | if (!SRpnt) |
02ae2c0e | 3013 | return (STp->buffer)->syscall_result; |
1da177e4 LT |
3014 | |
3015 | if ((STp->buffer)->syscall_result != 0 || | |
3016 | (STp->device->scsi_level >= SCSI_2 && | |
3017 | ((STp->buffer)->b_data[0] & 4) != 0)) { | |
3018 | *block = *partition = 0; | |
3019 | DEBC(printk(ST_DEB_MSG "%s: Can't read tape position.\n", name)); | |
3020 | result = (-EIO); | |
3021 | } else { | |
3022 | result = 0; | |
3023 | if ((STp->device)->scsi_level < SCSI_2) { | |
3024 | *block = ((STp->buffer)->b_data[0] << 16) | |
3025 | + ((STp->buffer)->b_data[1] << 8) | |
3026 | + (STp->buffer)->b_data[2]; | |
3027 | *partition = 0; | |
3028 | } else { | |
3029 | *block = ((STp->buffer)->b_data[4] << 24) | |
3030 | + ((STp->buffer)->b_data[5] << 16) | |
3031 | + ((STp->buffer)->b_data[6] << 8) | |
3032 | + (STp->buffer)->b_data[7]; | |
3033 | *partition = (STp->buffer)->b_data[1]; | |
3034 | if (((STp->buffer)->b_data[0] & 0x80) && | |
3035 | (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ | |
3036 | STp->ps[0].drv_block = STp->ps[0].drv_file = 0; | |
3037 | } | |
3038 | DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name, | |
3039 | *block, *partition)); | |
3040 | } | |
8b05b773 | 3041 | st_release_request(SRpnt); |
1da177e4 LT |
3042 | SRpnt = NULL; |
3043 | ||
3044 | return result; | |
3045 | } | |
3046 | ||
3047 | ||
3048 | /* Set the tape block and partition. Negative partition means that only the | |
3049 | block should be set in vendor specific way. */ | |
3050 | static int set_location(struct scsi_tape *STp, unsigned int block, int partition, | |
3051 | int logical) | |
3052 | { | |
3053 | struct st_partstat *STps; | |
3054 | int result, p; | |
3055 | unsigned int blk; | |
3056 | int timeout; | |
3057 | unsigned char scmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 3058 | struct st_request *SRpnt; |
1da177e4 LT |
3059 | DEB( char *name = tape_name(STp); ) |
3060 | ||
3061 | if (STp->ready != ST_READY) | |
3062 | return (-EIO); | |
3063 | timeout = STp->long_timeout; | |
3064 | STps = &(STp->ps[STp->partition]); | |
3065 | ||
3066 | DEBC(printk(ST_DEB_MSG "%s: Setting block to %d and partition to %d.\n", | |
3067 | name, block, partition)); | |
3068 | DEB(if (partition < 0) | |
3069 | return (-EIO); ) | |
3070 | ||
3071 | /* Update the location at the partition we are leaving */ | |
3072 | if ((!STp->can_partitions && partition != 0) || | |
3073 | partition >= ST_NBR_PARTITIONS) | |
3074 | return (-EINVAL); | |
3075 | if (partition != STp->partition) { | |
3076 | if (get_location(STp, &blk, &p, 1)) | |
3077 | STps->last_block_valid = 0; | |
3078 | else { | |
3079 | STps->last_block_valid = 1; | |
3080 | STps->last_block_visited = blk; | |
3081 | DEBC(printk(ST_DEB_MSG | |
3082 | "%s: Visited block %d for partition %d saved.\n", | |
3083 | name, blk, STp->partition)); | |
3084 | } | |
3085 | } | |
3086 | ||
3087 | memset(scmd, 0, MAX_COMMAND_SIZE); | |
3088 | if ((STp->device)->scsi_level < SCSI_2) { | |
3089 | scmd[0] = QFA_SEEK_BLOCK; | |
3090 | scmd[2] = (block >> 16); | |
3091 | scmd[3] = (block >> 8); | |
3092 | scmd[4] = block; | |
3093 | scmd[5] = 0; | |
3094 | } else { | |
3095 | scmd[0] = SEEK_10; | |
3096 | scmd[3] = (block >> 24); | |
3097 | scmd[4] = (block >> 16); | |
3098 | scmd[5] = (block >> 8); | |
3099 | scmd[6] = block; | |
3100 | if (!logical && !STp->scsi2_logical) | |
3101 | scmd[1] = 4; | |
3102 | if (STp->partition != partition) { | |
3103 | scmd[1] |= 2; | |
3104 | scmd[8] = partition; | |
3105 | DEBC(printk(ST_DEB_MSG | |
3106 | "%s: Trying to change partition from %d to %d\n", | |
3107 | name, STp->partition, partition)); | |
3108 | } | |
3109 | } | |
3110 | if (STp->immediate) { | |
3111 | scmd[1] |= 1; /* Don't wait for completion */ | |
a02488ed | 3112 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
3113 | } |
3114 | ||
02ae2c0e KM |
3115 | SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, |
3116 | timeout, MAX_READY_RETRIES, 1); | |
1da177e4 | 3117 | if (!SRpnt) |
02ae2c0e | 3118 | return (STp->buffer)->syscall_result; |
1da177e4 LT |
3119 | |
3120 | STps->drv_block = STps->drv_file = (-1); | |
3121 | STps->eof = ST_NOEOF; | |
3122 | if ((STp->buffer)->syscall_result != 0) { | |
3123 | result = (-EIO); | |
3124 | if (STp->can_partitions && | |
3125 | (STp->device)->scsi_level >= SCSI_2 && | |
3126 | (p = find_partition(STp)) >= 0) | |
3127 | STp->partition = p; | |
3128 | } else { | |
3129 | if (STp->can_partitions) { | |
3130 | STp->partition = partition; | |
3131 | STps = &(STp->ps[partition]); | |
3132 | if (!STps->last_block_valid || | |
3133 | STps->last_block_visited != block) { | |
3134 | STps->at_sm = 0; | |
3135 | STps->rw = ST_IDLE; | |
3136 | } | |
3137 | } else | |
3138 | STps->at_sm = 0; | |
3139 | if (block == 0) | |
3140 | STps->drv_block = STps->drv_file = 0; | |
3141 | result = 0; | |
3142 | } | |
02ae2c0e | 3143 | |
8b05b773 | 3144 | st_release_request(SRpnt); |
1da177e4 LT |
3145 | SRpnt = NULL; |
3146 | ||
3147 | return result; | |
3148 | } | |
3149 | ||
3150 | ||
3151 | /* Find the current partition number for the drive status. Called from open and | |
3152 | returns either partition number of negative error code. */ | |
3153 | static int find_partition(struct scsi_tape *STp) | |
3154 | { | |
3155 | int i, partition; | |
3156 | unsigned int block; | |
3157 | ||
3158 | if ((i = get_location(STp, &block, &partition, 1)) < 0) | |
3159 | return i; | |
3160 | if (partition >= ST_NBR_PARTITIONS) | |
3161 | return (-EIO); | |
3162 | return partition; | |
3163 | } | |
3164 | ||
3165 | ||
3166 | /* Change the partition if necessary */ | |
3167 | static int switch_partition(struct scsi_tape *STp) | |
3168 | { | |
3169 | struct st_partstat *STps; | |
3170 | ||
3171 | if (STp->partition == STp->new_partition) | |
3172 | return 0; | |
3173 | STps = &(STp->ps[STp->new_partition]); | |
3174 | if (!STps->last_block_valid) | |
3175 | STps->last_block_visited = 0; | |
3176 | return set_location(STp, STps->last_block_visited, STp->new_partition, 1); | |
3177 | } | |
3178 | \f | |
3179 | /* Functions for reading and writing the medium partition mode page. */ | |
3180 | ||
3181 | #define PART_PAGE 0x11 | |
3182 | #define PART_PAGE_FIXED_LENGTH 8 | |
3183 | ||
3184 | #define PP_OFF_MAX_ADD_PARTS 2 | |
3185 | #define PP_OFF_NBR_ADD_PARTS 3 | |
3186 | #define PP_OFF_FLAGS 4 | |
3187 | #define PP_OFF_PART_UNITS 6 | |
3188 | #define PP_OFF_RESERVED 7 | |
3189 | ||
3190 | #define PP_BIT_IDP 0x20 | |
3191 | #define PP_MSK_PSUM_MB 0x10 | |
3192 | ||
3193 | /* Get the number of partitions on the tape. As a side effect reads the | |
3194 | mode page into the tape buffer. */ | |
3195 | static int nbr_partitions(struct scsi_tape *STp) | |
3196 | { | |
3197 | int result; | |
3198 | DEB( char *name = tape_name(STp); ) | |
3199 | ||
3200 | if (STp->ready != ST_READY) | |
3201 | return (-EIO); | |
3202 | ||
3203 | result = read_mode_page(STp, PART_PAGE, 1); | |
3204 | ||
3205 | if (result) { | |
3206 | DEBC(printk(ST_DEB_MSG "%s: Can't read medium partition page.\n", | |
3207 | name)); | |
3208 | result = (-EIO); | |
3209 | } else { | |
3210 | result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + | |
3211 | PP_OFF_NBR_ADD_PARTS] + 1; | |
3212 | DEBC(printk(ST_DEB_MSG "%s: Number of partitions %d.\n", name, result)); | |
3213 | } | |
3214 | ||
3215 | return result; | |
3216 | } | |
3217 | ||
3218 | ||
3219 | /* Partition the tape into two partitions if size > 0 or one partition if | |
3220 | size == 0. | |
3221 | ||
3222 | The block descriptors are read and written because Sony SDT-7000 does not | |
3223 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). | |
3224 | ||
3225 | My HP C1533A drive returns only one partition size field. This is used to | |
3226 | set the size of partition 1. There is no size field for the default partition. | |
3227 | Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is | |
3228 | used to set the size of partition 1 (this is what the SCSI-3 standard specifies). | |
3229 | The following algorithm is used to accommodate both drives: if the number of | |
3230 | partition size fields is greater than the maximum number of additional partitions | |
3231 | in the mode page, the second field is used. Otherwise the first field is used. | |
3232 | ||
3233 | For Seagate DDS drives the page length must be 8 when no partitions is defined | |
3234 | and 10 when 1 partition is defined (information from Eric Lee Green). This is | |
3235 | is acceptable also to some other old drives and enforced if the first partition | |
3236 | size field is used for the first additional partition size. | |
3237 | */ | |
3238 | static int partition_tape(struct scsi_tape *STp, int size) | |
3239 | { | |
3240 | char *name = tape_name(STp); | |
3241 | int result; | |
3242 | int pgo, psd_cnt, psdo; | |
3243 | unsigned char *bp; | |
3244 | ||
3245 | result = read_mode_page(STp, PART_PAGE, 0); | |
3246 | if (result) { | |
3247 | DEBC(printk(ST_DEB_MSG "%s: Can't read partition mode page.\n", name)); | |
3248 | return result; | |
3249 | } | |
3250 | /* The mode page is in the buffer. Let's modify it and write it. */ | |
3251 | bp = (STp->buffer)->b_data; | |
3252 | pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; | |
3253 | DEBC(printk(ST_DEB_MSG "%s: Partition page length is %d bytes.\n", | |
3254 | name, bp[pgo + MP_OFF_PAGE_LENGTH] + 2)); | |
3255 | ||
3256 | psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; | |
3257 | psdo = pgo + PART_PAGE_FIXED_LENGTH; | |
3258 | if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) { | |
3259 | bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */ | |
3260 | psdo += 2; | |
3261 | } | |
3262 | memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); | |
3263 | ||
3264 | DEBC(printk("%s: psd_cnt %d, max.parts %d, nbr_parts %d\n", name, | |
3265 | psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], | |
3266 | bp[pgo + PP_OFF_NBR_ADD_PARTS])); | |
3267 | ||
3268 | if (size <= 0) { | |
3269 | bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; | |
3270 | if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) | |
3271 | bp[pgo + MP_OFF_PAGE_LENGTH] = 6; | |
3272 | DEBC(printk(ST_DEB_MSG "%s: Formatting tape with one partition.\n", | |
3273 | name)); | |
3274 | } else { | |
3275 | bp[psdo] = (size >> 8) & 0xff; | |
3276 | bp[psdo + 1] = size & 0xff; | |
3277 | bp[pgo + 3] = 1; | |
3278 | if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) | |
3279 | bp[pgo + MP_OFF_PAGE_LENGTH] = 8; | |
3280 | DEBC(printk(ST_DEB_MSG | |
3281 | "%s: Formatting tape with two partitions (1 = %d MB).\n", | |
3282 | name, size)); | |
3283 | } | |
3284 | bp[pgo + PP_OFF_PART_UNITS] = 0; | |
3285 | bp[pgo + PP_OFF_RESERVED] = 0; | |
3286 | bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB; | |
3287 | ||
3288 | result = write_mode_page(STp, PART_PAGE, 1); | |
3289 | if (result) { | |
3290 | printk(KERN_INFO "%s: Partitioning of tape failed.\n", name); | |
3291 | result = (-EIO); | |
3292 | } | |
3293 | ||
3294 | return result; | |
3295 | } | |
3296 | \f | |
3297 | ||
3298 | ||
3299 | /* The ioctl command */ | |
fd66c1b4 | 3300 | static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) |
1da177e4 LT |
3301 | { |
3302 | int i, cmd_nr, cmd_type, bt; | |
3303 | int retval = 0; | |
3304 | unsigned int blk; | |
3305 | struct scsi_tape *STp = file->private_data; | |
3306 | struct st_modedef *STm; | |
3307 | struct st_partstat *STps; | |
3308 | char *name = tape_name(STp); | |
3309 | void __user *p = (void __user *)arg; | |
3310 | ||
28f85009 | 3311 | if (mutex_lock_interruptible(&STp->lock)) |
1da177e4 LT |
3312 | return -ERESTARTSYS; |
3313 | ||
3314 | DEB( | |
3315 | if (debugging && !STp->in_use) { | |
3316 | printk(ST_DEB_MSG "%s: Incorrect device.\n", name); | |
3317 | retval = (-EIO); | |
3318 | goto out; | |
3319 | } ) /* end DEB */ | |
3320 | ||
3321 | STm = &(STp->modes[STp->current_mode]); | |
3322 | STps = &(STp->ps[STp->partition]); | |
3323 | ||
3324 | /* | |
3325 | * If we are in the middle of error recovery, don't let anyone | |
3326 | * else try and use this device. Also, if error recovery fails, it | |
3327 | * may try and take the device offline, in which case all further | |
3328 | * access to the device is prohibited. | |
3329 | */ | |
83ff6fe8 AV |
3330 | retval = scsi_nonblockable_ioctl(STp->device, cmd_in, p, |
3331 | file->f_flags & O_NDELAY); | |
1da177e4 LT |
3332 | if (!scsi_block_when_processing_errors(STp->device) || retval != -ENODEV) |
3333 | goto out; | |
3334 | retval = 0; | |
3335 | ||
3336 | cmd_type = _IOC_TYPE(cmd_in); | |
3337 | cmd_nr = _IOC_NR(cmd_in); | |
3338 | ||
3339 | if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { | |
3340 | struct mtop mtc; | |
3341 | ||
3342 | if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { | |
3343 | retval = (-EINVAL); | |
3344 | goto out; | |
3345 | } | |
3346 | ||
3347 | i = copy_from_user(&mtc, p, sizeof(struct mtop)); | |
3348 | if (i) { | |
3349 | retval = (-EFAULT); | |
3350 | goto out; | |
3351 | } | |
3352 | ||
3353 | if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { | |
3354 | printk(KERN_WARNING | |
3355 | "%s: MTSETDRVBUFFER only allowed for root.\n", name); | |
3356 | retval = (-EPERM); | |
3357 | goto out; | |
3358 | } | |
3359 | if (!STm->defined && | |
3360 | (mtc.mt_op != MTSETDRVBUFFER && | |
3361 | (mtc.mt_count & MT_ST_OPTIONS) == 0)) { | |
3362 | retval = (-ENXIO); | |
3363 | goto out; | |
3364 | } | |
3365 | ||
3366 | if (!STp->pos_unknown) { | |
3367 | ||
3368 | if (STps->eof == ST_FM_HIT) { | |
3369 | if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || | |
3370 | mtc.mt_op == MTEOM) { | |
3371 | mtc.mt_count -= 1; | |
3372 | if (STps->drv_file >= 0) | |
3373 | STps->drv_file += 1; | |
3374 | } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { | |
3375 | mtc.mt_count += 1; | |
3376 | if (STps->drv_file >= 0) | |
3377 | STps->drv_file += 1; | |
3378 | } | |
3379 | } | |
3380 | ||
3381 | if (mtc.mt_op == MTSEEK) { | |
3382 | /* Old position must be restored if partition will be | |
3383 | changed */ | |
3384 | i = !STp->can_partitions || | |
3385 | (STp->new_partition != STp->partition); | |
3386 | } else { | |
3387 | i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || | |
3388 | mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || | |
3389 | mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || | |
3390 | mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || | |
3391 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || | |
3392 | mtc.mt_op == MTCOMPRESSION; | |
3393 | } | |
3394 | i = flush_buffer(STp, i); | |
3395 | if (i < 0) { | |
3396 | retval = i; | |
3397 | goto out; | |
3398 | } | |
3399 | if (STps->rw == ST_WRITING && | |
3400 | (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || | |
3401 | mtc.mt_op == MTSEEK || | |
3402 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { | |
3403 | i = st_int_ioctl(STp, MTWEOF, 1); | |
3404 | if (i < 0) { | |
3405 | retval = i; | |
3406 | goto out; | |
3407 | } | |
3408 | if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) | |
3409 | mtc.mt_count++; | |
3410 | STps->rw = ST_IDLE; | |
3411 | } | |
3412 | ||
3413 | } else { | |
3414 | /* | |
3415 | * If there was a bus reset, block further access | |
3416 | * to this device. If the user wants to rewind the tape, | |
3417 | * then reset the flag and allow access again. | |
3418 | */ | |
3419 | if (mtc.mt_op != MTREW && | |
3420 | mtc.mt_op != MTOFFL && | |
3421 | mtc.mt_op != MTRETEN && | |
3422 | mtc.mt_op != MTERASE && | |
3423 | mtc.mt_op != MTSEEK && | |
3424 | mtc.mt_op != MTEOM) { | |
3425 | retval = (-EIO); | |
3426 | goto out; | |
3427 | } | |
3428 | reset_state(STp); | |
3429 | /* remove this when the midlevel properly clears was_reset */ | |
3430 | STp->device->was_reset = 0; | |
3431 | } | |
3432 | ||
3433 | if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && | |
3434 | mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && | |
3435 | mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) | |
3436 | STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ | |
3437 | ||
3438 | if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) | |
3439 | do_door_lock(STp, 0); /* Ignore result! */ | |
3440 | ||
3441 | if (mtc.mt_op == MTSETDRVBUFFER && | |
3442 | (mtc.mt_count & MT_ST_OPTIONS) != 0) { | |
3443 | retval = st_set_options(STp, mtc.mt_count); | |
3444 | goto out; | |
3445 | } | |
3446 | ||
3447 | if (mtc.mt_op == MTSETPART) { | |
3448 | if (!STp->can_partitions || | |
3449 | mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { | |
3450 | retval = (-EINVAL); | |
3451 | goto out; | |
3452 | } | |
3453 | if (mtc.mt_count >= STp->nbr_partitions && | |
3454 | (STp->nbr_partitions = nbr_partitions(STp)) < 0) { | |
3455 | retval = (-EIO); | |
3456 | goto out; | |
3457 | } | |
3458 | if (mtc.mt_count >= STp->nbr_partitions) { | |
3459 | retval = (-EINVAL); | |
3460 | goto out; | |
3461 | } | |
3462 | STp->new_partition = mtc.mt_count; | |
3463 | retval = 0; | |
3464 | goto out; | |
3465 | } | |
3466 | ||
3467 | if (mtc.mt_op == MTMKPART) { | |
3468 | if (!STp->can_partitions) { | |
3469 | retval = (-EINVAL); | |
3470 | goto out; | |
3471 | } | |
3472 | if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 || | |
3473 | (i = partition_tape(STp, mtc.mt_count)) < 0) { | |
3474 | retval = i; | |
3475 | goto out; | |
3476 | } | |
3477 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
3478 | STp->ps[i].rw = ST_IDLE; | |
3479 | STp->ps[i].at_sm = 0; | |
3480 | STp->ps[i].last_block_valid = 0; | |
3481 | } | |
3482 | STp->partition = STp->new_partition = 0; | |
3483 | STp->nbr_partitions = 1; /* Bad guess ?-) */ | |
3484 | STps->drv_block = STps->drv_file = 0; | |
3485 | retval = 0; | |
3486 | goto out; | |
3487 | } | |
3488 | ||
3489 | if (mtc.mt_op == MTSEEK) { | |
3490 | i = set_location(STp, mtc.mt_count, STp->new_partition, 0); | |
3491 | if (!STp->can_partitions) | |
3492 | STp->ps[0].rw = ST_IDLE; | |
3493 | retval = i; | |
3494 | goto out; | |
3495 | } | |
3496 | ||
3497 | if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { | |
3498 | retval = do_load_unload(STp, file, 0); | |
3499 | goto out; | |
3500 | } | |
3501 | ||
3502 | if (mtc.mt_op == MTLOAD) { | |
3503 | retval = do_load_unload(STp, file, max(1, mtc.mt_count)); | |
3504 | goto out; | |
3505 | } | |
3506 | ||
3507 | if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { | |
3508 | retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); | |
3509 | goto out; | |
3510 | } | |
3511 | ||
3512 | if (STp->can_partitions && STp->ready == ST_READY && | |
3513 | (i = switch_partition(STp)) < 0) { | |
3514 | retval = i; | |
3515 | goto out; | |
3516 | } | |
3517 | ||
3518 | if (mtc.mt_op == MTCOMPRESSION) | |
3519 | retval = st_compression(STp, (mtc.mt_count & 1)); | |
3520 | else | |
3521 | retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); | |
3522 | goto out; | |
3523 | } | |
3524 | if (!STm->defined) { | |
3525 | retval = (-ENXIO); | |
3526 | goto out; | |
3527 | } | |
3528 | ||
3529 | if ((i = flush_buffer(STp, 0)) < 0) { | |
3530 | retval = i; | |
3531 | goto out; | |
3532 | } | |
3533 | if (STp->can_partitions && | |
3534 | (i = switch_partition(STp)) < 0) { | |
3535 | retval = i; | |
3536 | goto out; | |
3537 | } | |
3538 | ||
3539 | if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { | |
3540 | struct mtget mt_status; | |
3541 | ||
3542 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { | |
3543 | retval = (-EINVAL); | |
3544 | goto out; | |
3545 | } | |
3546 | ||
3547 | mt_status.mt_type = STp->tape_type; | |
3548 | mt_status.mt_dsreg = | |
3549 | ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | | |
3550 | ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); | |
3551 | mt_status.mt_blkno = STps->drv_block; | |
3552 | mt_status.mt_fileno = STps->drv_file; | |
3553 | if (STp->block_size != 0) { | |
3554 | if (STps->rw == ST_WRITING) | |
3555 | mt_status.mt_blkno += | |
3556 | (STp->buffer)->buffer_bytes / STp->block_size; | |
3557 | else if (STps->rw == ST_READING) | |
3558 | mt_status.mt_blkno -= | |
3559 | ((STp->buffer)->buffer_bytes + | |
3560 | STp->block_size - 1) / STp->block_size; | |
3561 | } | |
3562 | ||
3563 | mt_status.mt_gstat = 0; | |
3564 | if (STp->drv_write_prot) | |
3565 | mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
3566 | if (mt_status.mt_blkno == 0) { | |
3567 | if (mt_status.mt_fileno == 0) | |
3568 | mt_status.mt_gstat |= GMT_BOT(0xffffffff); | |
3569 | else | |
3570 | mt_status.mt_gstat |= GMT_EOF(0xffffffff); | |
3571 | } | |
3572 | mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); | |
3573 | mt_status.mt_resid = STp->partition; | |
3574 | if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) | |
3575 | mt_status.mt_gstat |= GMT_EOT(0xffffffff); | |
3576 | else if (STps->eof >= ST_EOM_OK) | |
3577 | mt_status.mt_gstat |= GMT_EOD(0xffffffff); | |
3578 | if (STp->density == 1) | |
3579 | mt_status.mt_gstat |= GMT_D_800(0xffffffff); | |
3580 | else if (STp->density == 2) | |
3581 | mt_status.mt_gstat |= GMT_D_1600(0xffffffff); | |
3582 | else if (STp->density == 3) | |
3583 | mt_status.mt_gstat |= GMT_D_6250(0xffffffff); | |
3584 | if (STp->ready == ST_READY) | |
3585 | mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); | |
3586 | if (STp->ready == ST_NO_TAPE) | |
3587 | mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); | |
3588 | if (STps->at_sm) | |
3589 | mt_status.mt_gstat |= GMT_SM(0xffffffff); | |
3590 | if (STm->do_async_writes || | |
3591 | (STm->do_buffer_writes && STp->block_size != 0) || | |
3592 | STp->drv_buffer != 0) | |
3593 | mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); | |
3594 | if (STp->cleaning_req) | |
3595 | mt_status.mt_gstat |= GMT_CLN(0xffffffff); | |
3596 | ||
3597 | i = copy_to_user(p, &mt_status, sizeof(struct mtget)); | |
3598 | if (i) { | |
3599 | retval = (-EFAULT); | |
3600 | goto out; | |
3601 | } | |
3602 | ||
3603 | STp->recover_reg = 0; /* Clear after read */ | |
3604 | retval = 0; | |
3605 | goto out; | |
3606 | } /* End of MTIOCGET */ | |
3607 | if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { | |
3608 | struct mtpos mt_pos; | |
3609 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { | |
3610 | retval = (-EINVAL); | |
3611 | goto out; | |
3612 | } | |
3613 | if ((i = get_location(STp, &blk, &bt, 0)) < 0) { | |
3614 | retval = i; | |
3615 | goto out; | |
3616 | } | |
3617 | mt_pos.mt_blkno = blk; | |
3618 | i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); | |
3619 | if (i) | |
3620 | retval = (-EFAULT); | |
3621 | goto out; | |
3622 | } | |
28f85009 | 3623 | mutex_unlock(&STp->lock); |
1da177e4 LT |
3624 | switch (cmd_in) { |
3625 | case SCSI_IOCTL_GET_IDLUN: | |
3626 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
3627 | break; | |
3628 | default: | |
16c4b3e2 KM |
3629 | if ((cmd_in == SG_IO || |
3630 | cmd_in == SCSI_IOCTL_SEND_COMMAND || | |
3631 | cmd_in == CDROM_SEND_PACKET) && | |
3632 | !capable(CAP_SYS_RAWIO)) | |
1da177e4 LT |
3633 | i = -EPERM; |
3634 | else | |
74f3c8af AV |
3635 | i = scsi_cmd_ioctl(STp->disk->queue, STp->disk, |
3636 | file->f_mode, cmd_in, p); | |
1da177e4 LT |
3637 | if (i != -ENOTTY) |
3638 | return i; | |
3639 | break; | |
3640 | } | |
16c4b3e2 KM |
3641 | retval = scsi_ioctl(STp->device, cmd_in, p); |
3642 | if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */ | |
3643 | STp->rew_at_close = 0; | |
3644 | STp->ready = ST_NO_TAPE; | |
3645 | } | |
3646 | return retval; | |
1da177e4 LT |
3647 | |
3648 | out: | |
28f85009 | 3649 | mutex_unlock(&STp->lock); |
1da177e4 LT |
3650 | return retval; |
3651 | } | |
3652 | ||
3653 | #ifdef CONFIG_COMPAT | |
3654 | static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
3655 | { | |
3656 | struct scsi_tape *STp = file->private_data; | |
3657 | struct scsi_device *sdev = STp->device; | |
3658 | int ret = -ENOIOCTLCMD; | |
3659 | if (sdev->host->hostt->compat_ioctl) { | |
3660 | ||
3661 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); | |
3662 | ||
3663 | } | |
3664 | return ret; | |
3665 | } | |
3666 | #endif | |
3667 | ||
3668 | \f | |
3669 | ||
3670 | /* Try to allocate a new tape buffer. Calling function must not hold | |
3671 | dev_arr_lock. */ | |
f409d6cc | 3672 | static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) |
1da177e4 | 3673 | { |
1da177e4 LT |
3674 | struct st_buffer *tb; |
3675 | ||
f409d6cc | 3676 | tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC); |
1da177e4 LT |
3677 | if (!tb) { |
3678 | printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); | |
3679 | return NULL; | |
3680 | } | |
1ac63cf5 | 3681 | tb->frp_segs = 0; |
1da177e4 | 3682 | tb->use_sg = max_sg; |
1da177e4 | 3683 | tb->dma = need_dma; |
f409d6cc | 3684 | tb->buffer_size = 0; |
1da177e4 | 3685 | |
f409d6cc FT |
3686 | tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *), |
3687 | GFP_ATOMIC); | |
d0e1ae31 FT |
3688 | if (!tb->reserved_pages) { |
3689 | kfree(tb); | |
3690 | return NULL; | |
3691 | } | |
3692 | ||
1da177e4 LT |
3693 | return tb; |
3694 | } | |
3695 | ||
3696 | ||
3697 | /* Try to allocate enough space in the tape buffer */ | |
8f78fc5e KM |
3698 | #define ST_MAX_ORDER 6 |
3699 | ||
1da177e4 LT |
3700 | static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) |
3701 | { | |
c53033f6 AV |
3702 | int segs, nbr, max_segs, b_size, order, got; |
3703 | gfp_t priority; | |
1da177e4 LT |
3704 | |
3705 | if (new_size <= STbuffer->buffer_size) | |
3706 | return 1; | |
3707 | ||
3708 | if (STbuffer->buffer_size <= PAGE_SIZE) | |
3709 | normalize_buffer(STbuffer); /* Avoid extra segment */ | |
3710 | ||
3711 | max_segs = STbuffer->use_sg; | |
3712 | nbr = max_segs - STbuffer->frp_segs; | |
3713 | if (nbr <= 0) | |
3714 | return 0; | |
3715 | ||
3716 | priority = GFP_KERNEL | __GFP_NOWARN; | |
3717 | if (need_dma) | |
3718 | priority |= GFP_DMA; | |
9c905966 | 3719 | |
08c95832 FT |
3720 | if (STbuffer->cleared) |
3721 | priority |= __GFP_ZERO; | |
3722 | ||
9c905966 | 3723 | if (STbuffer->frp_segs) { |
08c95832 FT |
3724 | order = STbuffer->map_data.page_order; |
3725 | b_size = PAGE_SIZE << order; | |
9c905966 FT |
3726 | } else { |
3727 | for (b_size = PAGE_SIZE, order = 0; | |
8f78fc5e KM |
3728 | order < ST_MAX_ORDER && b_size < new_size; |
3729 | order++, b_size *= 2) | |
9c905966 FT |
3730 | ; /* empty */ |
3731 | } | |
8f78fc5e KM |
3732 | if (max_segs * (PAGE_SIZE << order) < new_size) { |
3733 | if (order == ST_MAX_ORDER) | |
3734 | return 0; | |
3735 | normalize_buffer(STbuffer); | |
3736 | return enlarge_buffer(STbuffer, new_size, need_dma); | |
3737 | } | |
1da177e4 LT |
3738 | |
3739 | for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; | |
3740 | segs < max_segs && got < new_size;) { | |
08c95832 FT |
3741 | struct page *page; |
3742 | ||
3743 | page = alloc_pages(priority, order); | |
3744 | if (!page) { | |
1da177e4 LT |
3745 | DEB(STbuffer->buffer_size = got); |
3746 | normalize_buffer(STbuffer); | |
3747 | return 0; | |
3748 | } | |
08c95832 | 3749 | |
1da177e4 LT |
3750 | STbuffer->frp_segs += 1; |
3751 | got += b_size; | |
3752 | STbuffer->buffer_size = got; | |
08c95832 | 3753 | STbuffer->reserved_pages[segs] = page; |
1da177e4 LT |
3754 | segs++; |
3755 | } | |
08c95832 | 3756 | STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); |
d0e1ae31 | 3757 | STbuffer->map_data.page_order = order; |
1da177e4 LT |
3758 | |
3759 | return 1; | |
3760 | } | |
3761 | ||
3762 | ||
40f6b36c KM |
3763 | /* Make sure that no data from previous user is in the internal buffer */ |
3764 | static void clear_buffer(struct st_buffer * st_bp) | |
3765 | { | |
3766 | int i; | |
3767 | ||
3768 | for (i=0; i < st_bp->frp_segs; i++) | |
08c95832 FT |
3769 | memset(page_address(st_bp->reserved_pages[i]), 0, |
3770 | PAGE_SIZE << st_bp->map_data.page_order); | |
40f6b36c KM |
3771 | st_bp->cleared = 1; |
3772 | } | |
3773 | ||
3774 | ||
1da177e4 LT |
3775 | /* Release the extra buffer */ |
3776 | static void normalize_buffer(struct st_buffer * STbuffer) | |
3777 | { | |
08c95832 | 3778 | int i, order = STbuffer->map_data.page_order; |
1da177e4 | 3779 | |
1ac63cf5 | 3780 | for (i = 0; i < STbuffer->frp_segs; i++) { |
08c95832 FT |
3781 | __free_pages(STbuffer->reserved_pages[i], order); |
3782 | STbuffer->buffer_size -= (PAGE_SIZE << order); | |
1da177e4 | 3783 | } |
1ac63cf5 | 3784 | STbuffer->frp_segs = 0; |
8b05b773 | 3785 | STbuffer->sg_segs = 0; |
d0e1ae31 FT |
3786 | STbuffer->map_data.page_order = 0; |
3787 | STbuffer->map_data.offset = 0; | |
1da177e4 LT |
3788 | } |
3789 | ||
3790 | ||
3791 | /* Move data from the user buffer to the tape buffer. Returns zero (success) or | |
3792 | negative error code. */ | |
3793 | static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) | |
3794 | { | |
3795 | int i, cnt, res, offset; | |
08c95832 | 3796 | int length = PAGE_SIZE << st_bp->map_data.page_order; |
1da177e4 LT |
3797 | |
3798 | for (i = 0, offset = st_bp->buffer_bytes; | |
08c95832 FT |
3799 | i < st_bp->frp_segs && offset >= length; i++) |
3800 | offset -= length; | |
1da177e4 LT |
3801 | if (i == st_bp->frp_segs) { /* Should never happen */ |
3802 | printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); | |
3803 | return (-EIO); | |
3804 | } | |
3805 | for (; i < st_bp->frp_segs && do_count > 0; i++) { | |
08c95832 FT |
3806 | struct page *page = st_bp->reserved_pages[i]; |
3807 | cnt = length - offset < do_count ? length - offset : do_count; | |
3808 | res = copy_from_user(page_address(page) + offset, ubp, cnt); | |
1da177e4 LT |
3809 | if (res) |
3810 | return (-EFAULT); | |
3811 | do_count -= cnt; | |
3812 | st_bp->buffer_bytes += cnt; | |
3813 | ubp += cnt; | |
3814 | offset = 0; | |
3815 | } | |
3816 | if (do_count) /* Should never happen */ | |
3817 | return (-EIO); | |
3818 | ||
3819 | return 0; | |
3820 | } | |
3821 | ||
3822 | ||
3823 | /* Move data from the tape buffer to the user buffer. Returns zero (success) or | |
3824 | negative error code. */ | |
3825 | static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) | |
3826 | { | |
3827 | int i, cnt, res, offset; | |
08c95832 | 3828 | int length = PAGE_SIZE << st_bp->map_data.page_order; |
1da177e4 LT |
3829 | |
3830 | for (i = 0, offset = st_bp->read_pointer; | |
08c95832 FT |
3831 | i < st_bp->frp_segs && offset >= length; i++) |
3832 | offset -= length; | |
1da177e4 LT |
3833 | if (i == st_bp->frp_segs) { /* Should never happen */ |
3834 | printk(KERN_WARNING "st: from_buffer offset overflow.\n"); | |
3835 | return (-EIO); | |
3836 | } | |
3837 | for (; i < st_bp->frp_segs && do_count > 0; i++) { | |
08c95832 FT |
3838 | struct page *page = st_bp->reserved_pages[i]; |
3839 | cnt = length - offset < do_count ? length - offset : do_count; | |
3840 | res = copy_to_user(ubp, page_address(page) + offset, cnt); | |
1da177e4 LT |
3841 | if (res) |
3842 | return (-EFAULT); | |
3843 | do_count -= cnt; | |
3844 | st_bp->buffer_bytes -= cnt; | |
3845 | st_bp->read_pointer += cnt; | |
3846 | ubp += cnt; | |
3847 | offset = 0; | |
3848 | } | |
3849 | if (do_count) /* Should never happen */ | |
3850 | return (-EIO); | |
3851 | ||
3852 | return 0; | |
3853 | } | |
3854 | ||
3855 | ||
3856 | /* Move data towards start of buffer */ | |
3857 | static void move_buffer_data(struct st_buffer * st_bp, int offset) | |
3858 | { | |
3859 | int src_seg, dst_seg, src_offset = 0, dst_offset; | |
3860 | int count, total; | |
08c95832 | 3861 | int length = PAGE_SIZE << st_bp->map_data.page_order; |
1da177e4 LT |
3862 | |
3863 | if (offset == 0) | |
3864 | return; | |
3865 | ||
3866 | total=st_bp->buffer_bytes - offset; | |
3867 | for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { | |
3868 | src_offset = offset; | |
08c95832 | 3869 | if (src_offset < length) |
1da177e4 | 3870 | break; |
08c95832 | 3871 | offset -= length; |
1da177e4 LT |
3872 | } |
3873 | ||
3874 | st_bp->buffer_bytes = st_bp->read_pointer = total; | |
3875 | for (dst_seg=dst_offset=0; total > 0; ) { | |
08c95832 FT |
3876 | struct page *dpage = st_bp->reserved_pages[dst_seg]; |
3877 | struct page *spage = st_bp->reserved_pages[src_seg]; | |
3878 | ||
3879 | count = min(length - dst_offset, length - src_offset); | |
3880 | memmove(page_address(dpage) + dst_offset, | |
3881 | page_address(spage) + src_offset, count); | |
1da177e4 | 3882 | src_offset += count; |
08c95832 | 3883 | if (src_offset >= length) { |
1da177e4 LT |
3884 | src_seg++; |
3885 | src_offset = 0; | |
3886 | } | |
3887 | dst_offset += count; | |
08c95832 | 3888 | if (dst_offset >= length) { |
1da177e4 LT |
3889 | dst_seg++; |
3890 | dst_offset = 0; | |
3891 | } | |
3892 | total -= count; | |
3893 | } | |
3894 | } | |
3895 | ||
1da177e4 LT |
3896 | /* Validate the options from command line or module parameters */ |
3897 | static void validate_options(void) | |
3898 | { | |
3899 | if (buffer_kbs > 0) | |
3900 | st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; | |
3901 | if (max_sg_segs >= ST_FIRST_SG) | |
3902 | st_max_sg_segs = max_sg_segs; | |
3903 | } | |
3904 | ||
3905 | #ifndef MODULE | |
3906 | /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. | |
3907 | */ | |
3908 | static int __init st_setup(char *str) | |
3909 | { | |
3910 | int i, len, ints[5]; | |
3911 | char *stp; | |
3912 | ||
3913 | stp = get_options(str, ARRAY_SIZE(ints), ints); | |
3914 | ||
3915 | if (ints[0] > 0) { | |
3916 | for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) | |
3917 | if (parms[i].val) | |
3918 | *parms[i].val = ints[i + 1]; | |
3919 | } else { | |
3920 | while (stp != NULL) { | |
3921 | for (i = 0; i < ARRAY_SIZE(parms); i++) { | |
3922 | len = strlen(parms[i].name); | |
3923 | if (!strncmp(stp, parms[i].name, len) && | |
3924 | (*(stp + len) == ':' || *(stp + len) == '=')) { | |
3925 | if (parms[i].val) | |
3926 | *parms[i].val = | |
3927 | simple_strtoul(stp + len + 1, NULL, 0); | |
3928 | else | |
3929 | printk(KERN_WARNING "st: Obsolete parameter %s\n", | |
3930 | parms[i].name); | |
3931 | break; | |
3932 | } | |
3933 | } | |
6391a113 | 3934 | if (i >= ARRAY_SIZE(parms)) |
1da177e4 LT |
3935 | printk(KERN_WARNING "st: invalid parameter in '%s'\n", |
3936 | stp); | |
3937 | stp = strchr(stp, ','); | |
3938 | if (stp) | |
3939 | stp++; | |
3940 | } | |
3941 | } | |
3942 | ||
3943 | validate_options(); | |
3944 | ||
3945 | return 1; | |
3946 | } | |
3947 | ||
3948 | __setup("st=", st_setup); | |
3949 | ||
3950 | #endif | |
3951 | ||
00977a59 | 3952 | static const struct file_operations st_fops = |
1da177e4 LT |
3953 | { |
3954 | .owner = THIS_MODULE, | |
3955 | .read = st_read, | |
3956 | .write = st_write, | |
fd66c1b4 | 3957 | .unlocked_ioctl = st_ioctl, |
1da177e4 LT |
3958 | #ifdef CONFIG_COMPAT |
3959 | .compat_ioctl = st_compat_ioctl, | |
3960 | #endif | |
3961 | .open = st_open, | |
3962 | .flush = st_flush, | |
3963 | .release = st_release, | |
3964 | }; | |
3965 | ||
3966 | static int st_probe(struct device *dev) | |
3967 | { | |
3968 | struct scsi_device *SDp = to_scsi_device(dev); | |
3969 | struct gendisk *disk = NULL; | |
3970 | struct cdev *cdev = NULL; | |
3971 | struct scsi_tape *tpnt = NULL; | |
3972 | struct st_modedef *STm; | |
3973 | struct st_partstat *STps; | |
3974 | struct st_buffer *buffer; | |
3975 | int i, j, mode, dev_num, error; | |
3976 | char *stp; | |
1da177e4 LT |
3977 | |
3978 | if (SDp->type != TYPE_TAPE) | |
3979 | return -ENODEV; | |
3980 | if ((stp = st_incompatible(SDp))) { | |
3bf743e7 | 3981 | sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n"); |
1da177e4 LT |
3982 | printk(KERN_INFO "st: The suggested driver is %s.\n", stp); |
3983 | return -ENODEV; | |
3984 | } | |
3985 | ||
8b05b773 MC |
3986 | i = min(SDp->request_queue->max_hw_segments, |
3987 | SDp->request_queue->max_phys_segments); | |
1da177e4 LT |
3988 | if (st_max_sg_segs < i) |
3989 | i = st_max_sg_segs; | |
f409d6cc | 3990 | buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i); |
1da177e4 LT |
3991 | if (buffer == NULL) { |
3992 | printk(KERN_ERR | |
3993 | "st: Can't allocate new tape buffer. Device not attached.\n"); | |
3994 | goto out; | |
3995 | } | |
3996 | ||
3997 | disk = alloc_disk(1); | |
3998 | if (!disk) { | |
3999 | printk(KERN_ERR "st: out of memory. Device not attached.\n"); | |
4000 | goto out_buffer_free; | |
4001 | } | |
4002 | ||
4003 | write_lock(&st_dev_arr_lock); | |
4004 | if (st_nr_dev >= st_dev_max) { | |
4005 | struct scsi_tape **tmp_da; | |
4006 | int tmp_dev_max; | |
4007 | ||
4008 | tmp_dev_max = max(st_nr_dev * 2, 8); | |
4009 | if (tmp_dev_max > ST_MAX_TAPES) | |
4010 | tmp_dev_max = ST_MAX_TAPES; | |
4011 | if (tmp_dev_max <= st_nr_dev) { | |
4012 | write_unlock(&st_dev_arr_lock); | |
4013 | printk(KERN_ERR "st: Too many tape devices (max. %d).\n", | |
4014 | ST_MAX_TAPES); | |
4015 | goto out_put_disk; | |
4016 | } | |
4017 | ||
24669f75 | 4018 | tmp_da = kzalloc(tmp_dev_max * sizeof(struct scsi_tape *), GFP_ATOMIC); |
1da177e4 LT |
4019 | if (tmp_da == NULL) { |
4020 | write_unlock(&st_dev_arr_lock); | |
4021 | printk(KERN_ERR "st: Can't extend device array.\n"); | |
4022 | goto out_put_disk; | |
4023 | } | |
4024 | ||
1da177e4 LT |
4025 | if (scsi_tapes != NULL) { |
4026 | memcpy(tmp_da, scsi_tapes, | |
4027 | st_dev_max * sizeof(struct scsi_tape *)); | |
4028 | kfree(scsi_tapes); | |
4029 | } | |
4030 | scsi_tapes = tmp_da; | |
4031 | ||
4032 | st_dev_max = tmp_dev_max; | |
4033 | } | |
4034 | ||
4035 | for (i = 0; i < st_dev_max; i++) | |
4036 | if (scsi_tapes[i] == NULL) | |
4037 | break; | |
4038 | if (i >= st_dev_max) | |
4039 | panic("scsi_devices corrupt (st)"); | |
4040 | ||
24669f75 | 4041 | tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC); |
1da177e4 LT |
4042 | if (tpnt == NULL) { |
4043 | write_unlock(&st_dev_arr_lock); | |
4044 | printk(KERN_ERR "st: Can't allocate device descriptor.\n"); | |
4045 | goto out_put_disk; | |
4046 | } | |
f03a5670 | 4047 | kref_init(&tpnt->kref); |
1da177e4 LT |
4048 | tpnt->disk = disk; |
4049 | sprintf(disk->disk_name, "st%d", i); | |
4050 | disk->private_data = &tpnt->driver; | |
4051 | disk->queue = SDp->request_queue; | |
4052 | tpnt->driver = &st_template; | |
4053 | scsi_tapes[i] = tpnt; | |
4054 | dev_num = i; | |
4055 | ||
4056 | tpnt->device = SDp; | |
4057 | if (SDp->scsi_level <= 2) | |
4058 | tpnt->tape_type = MT_ISSCSI1; | |
4059 | else | |
4060 | tpnt->tape_type = MT_ISSCSI2; | |
4061 | ||
4062 | tpnt->buffer = buffer; | |
f03a5670 | 4063 | tpnt->buffer->last_SRpnt = NULL; |
1da177e4 LT |
4064 | |
4065 | tpnt->inited = 0; | |
4066 | tpnt->dirty = 0; | |
4067 | tpnt->in_use = 0; | |
4068 | tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ | |
4069 | tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; | |
4070 | tpnt->use_pf = (SDp->scsi_level >= SCSI_2); | |
4071 | tpnt->density = 0; | |
4072 | tpnt->do_auto_lock = ST_AUTO_LOCK; | |
4073 | tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ | |
4074 | tpnt->can_partitions = 0; | |
4075 | tpnt->two_fm = ST_TWO_FM; | |
4076 | tpnt->fast_mteom = ST_FAST_MTEOM; | |
4077 | tpnt->scsi2_logical = ST_SCSI2LOGICAL; | |
40f6b36c | 4078 | tpnt->sili = ST_SILI; |
1da177e4 LT |
4079 | tpnt->immediate = ST_NOWAIT; |
4080 | tpnt->default_drvbuffer = 0xff; /* No forced buffering */ | |
4081 | tpnt->partition = 0; | |
4082 | tpnt->new_partition = 0; | |
4083 | tpnt->nbr_partitions = 0; | |
a02488ed | 4084 | blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT); |
1da177e4 LT |
4085 | tpnt->long_timeout = ST_LONG_TIMEOUT; |
4086 | tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; | |
4087 | ||
1da177e4 LT |
4088 | for (i = 0; i < ST_NBR_MODES; i++) { |
4089 | STm = &(tpnt->modes[i]); | |
4090 | STm->defined = 0; | |
4091 | STm->sysv = ST_SYSV; | |
4092 | STm->defaults_for_writes = 0; | |
4093 | STm->do_async_writes = ST_ASYNC_WRITES; | |
4094 | STm->do_buffer_writes = ST_BUFFER_WRITES; | |
4095 | STm->do_read_ahead = ST_READ_AHEAD; | |
4096 | STm->default_compression = ST_DONT_TOUCH; | |
4097 | STm->default_blksize = (-1); /* No forced size */ | |
4098 | STm->default_density = (-1); /* No forced density */ | |
4099 | } | |
4100 | ||
4101 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
4102 | STps = &(tpnt->ps[i]); | |
4103 | STps->rw = ST_IDLE; | |
4104 | STps->eof = ST_NOEOF; | |
4105 | STps->at_sm = 0; | |
4106 | STps->last_block_valid = 0; | |
4107 | STps->drv_block = (-1); | |
4108 | STps->drv_file = (-1); | |
4109 | } | |
4110 | ||
4111 | tpnt->current_mode = 0; | |
4112 | tpnt->modes[0].defined = 1; | |
4113 | ||
4114 | tpnt->density_changed = tpnt->compression_changed = | |
4115 | tpnt->blksize_changed = 0; | |
28f85009 | 4116 | mutex_init(&tpnt->lock); |
1da177e4 LT |
4117 | |
4118 | st_nr_dev++; | |
4119 | write_unlock(&st_dev_arr_lock); | |
4120 | ||
4121 | for (mode = 0; mode < ST_NBR_MODES; ++mode) { | |
4122 | STm = &(tpnt->modes[mode]); | |
4123 | for (j=0; j < 2; j++) { | |
4124 | cdev = cdev_alloc(); | |
4125 | if (!cdev) { | |
4126 | printk(KERN_ERR | |
4127 | "st%d: out of memory. Device not attached.\n", | |
4128 | dev_num); | |
4129 | goto out_free_tape; | |
4130 | } | |
4131 | cdev->owner = THIS_MODULE; | |
4132 | cdev->ops = &st_fops; | |
4133 | ||
4134 | error = cdev_add(cdev, | |
4135 | MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, j)), | |
4136 | 1); | |
4137 | if (error) { | |
4138 | printk(KERN_ERR "st%d: Can't add %s-rewind mode %d\n", | |
4139 | dev_num, j ? "non" : "auto", mode); | |
4140 | printk(KERN_ERR "st%d: Device not attached.\n", dev_num); | |
4141 | goto out_free_tape; | |
4142 | } | |
4143 | STm->cdevs[j] = cdev; | |
4144 | ||
4145 | } | |
13026a6b JG |
4146 | error = do_create_class_files(tpnt, dev_num, mode); |
4147 | if (error) | |
4148 | goto out_free_tape; | |
1da177e4 LT |
4149 | } |
4150 | ||
42252854 | 4151 | sdev_printk(KERN_NOTICE, SDp, |
8b1ea24c | 4152 | "Attached scsi tape %s\n", tape_name(tpnt)); |
42252854 KM |
4153 | sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n", |
4154 | tape_name(tpnt), tpnt->try_dio ? "yes" : "no", | |
4155 | queue_dma_alignment(SDp->request_queue) + 1); | |
1da177e4 LT |
4156 | |
4157 | return 0; | |
4158 | ||
4159 | out_free_tape: | |
4160 | for (mode=0; mode < ST_NBR_MODES; mode++) { | |
4161 | STm = &(tpnt->modes[mode]); | |
4162 | sysfs_remove_link(&tpnt->device->sdev_gendev.kobj, | |
4163 | "tape"); | |
4164 | for (j=0; j < 2; j++) { | |
4165 | if (STm->cdevs[j]) { | |
4166 | if (cdev == STm->cdevs[j]) | |
4167 | cdev = NULL; | |
ee959b00 TJ |
4168 | device_destroy(st_sysfs_class, |
4169 | MKDEV(SCSI_TAPE_MAJOR, | |
4170 | TAPE_MINOR(i, mode, j))); | |
1da177e4 LT |
4171 | cdev_del(STm->cdevs[j]); |
4172 | } | |
4173 | } | |
4174 | } | |
4175 | if (cdev) | |
4176 | cdev_del(cdev); | |
4177 | write_lock(&st_dev_arr_lock); | |
4178 | scsi_tapes[dev_num] = NULL; | |
4179 | st_nr_dev--; | |
4180 | write_unlock(&st_dev_arr_lock); | |
4181 | out_put_disk: | |
4182 | put_disk(disk); | |
c9475cb0 | 4183 | kfree(tpnt); |
1da177e4 LT |
4184 | out_buffer_free: |
4185 | kfree(buffer); | |
4186 | out: | |
4187 | return -ENODEV; | |
4188 | }; | |
4189 | ||
4190 | ||
4191 | static int st_remove(struct device *dev) | |
4192 | { | |
4193 | struct scsi_device *SDp = to_scsi_device(dev); | |
4194 | struct scsi_tape *tpnt; | |
4195 | int i, j, mode; | |
4196 | ||
4197 | write_lock(&st_dev_arr_lock); | |
4198 | for (i = 0; i < st_dev_max; i++) { | |
4199 | tpnt = scsi_tapes[i]; | |
4200 | if (tpnt != NULL && tpnt->device == SDp) { | |
4201 | scsi_tapes[i] = NULL; | |
4202 | st_nr_dev--; | |
4203 | write_unlock(&st_dev_arr_lock); | |
1da177e4 LT |
4204 | sysfs_remove_link(&tpnt->device->sdev_gendev.kobj, |
4205 | "tape"); | |
4206 | for (mode = 0; mode < ST_NBR_MODES; ++mode) { | |
1da177e4 | 4207 | for (j=0; j < 2; j++) { |
ee959b00 TJ |
4208 | device_destroy(st_sysfs_class, |
4209 | MKDEV(SCSI_TAPE_MAJOR, | |
4210 | TAPE_MINOR(i, mode, j))); | |
1da177e4 LT |
4211 | cdev_del(tpnt->modes[mode].cdevs[j]); |
4212 | tpnt->modes[mode].cdevs[j] = NULL; | |
4213 | } | |
4214 | } | |
1da177e4 | 4215 | |
0b950672 | 4216 | mutex_lock(&st_ref_mutex); |
f03a5670 | 4217 | kref_put(&tpnt->kref, scsi_tape_release); |
0b950672 | 4218 | mutex_unlock(&st_ref_mutex); |
1da177e4 LT |
4219 | return 0; |
4220 | } | |
4221 | } | |
4222 | ||
4223 | write_unlock(&st_dev_arr_lock); | |
4224 | return 0; | |
4225 | } | |
4226 | ||
f03a5670 KM |
4227 | /** |
4228 | * scsi_tape_release - Called to free the Scsi_Tape structure | |
4229 | * @kref: pointer to embedded kref | |
4230 | * | |
0b950672 | 4231 | * st_ref_mutex must be held entering this routine. Because it is |
f03a5670 KM |
4232 | * called on last put, you should always use the scsi_tape_get() |
4233 | * scsi_tape_put() helpers which manipulate the semaphore directly | |
4234 | * and never do a direct kref_put(). | |
4235 | **/ | |
4236 | static void scsi_tape_release(struct kref *kref) | |
4237 | { | |
4238 | struct scsi_tape *tpnt = to_scsi_tape(kref); | |
4239 | struct gendisk *disk = tpnt->disk; | |
4240 | ||
4241 | tpnt->device = NULL; | |
4242 | ||
4243 | if (tpnt->buffer) { | |
f03a5670 | 4244 | normalize_buffer(tpnt->buffer); |
d0e1ae31 | 4245 | kfree(tpnt->buffer->reserved_pages); |
f03a5670 KM |
4246 | kfree(tpnt->buffer); |
4247 | } | |
4248 | ||
4249 | disk->private_data = NULL; | |
4250 | put_disk(disk); | |
4251 | kfree(tpnt); | |
4252 | return; | |
4253 | } | |
4254 | ||
1da177e4 LT |
4255 | static int __init init_st(void) |
4256 | { | |
13026a6b JG |
4257 | int err; |
4258 | ||
1da177e4 LT |
4259 | validate_options(); |
4260 | ||
13026a6b | 4261 | printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n", |
1da177e4 LT |
4262 | verstr, st_fixed_buffer_size, st_max_sg_segs); |
4263 | ||
d253878b | 4264 | st_sysfs_class = class_create(THIS_MODULE, "scsi_tape"); |
1da177e4 | 4265 | if (IS_ERR(st_sysfs_class)) { |
1da177e4 | 4266 | printk(KERN_ERR "Unable create sysfs class for SCSI tapes\n"); |
13026a6b | 4267 | return PTR_ERR(st_sysfs_class); |
1da177e4 LT |
4268 | } |
4269 | ||
13026a6b JG |
4270 | err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), |
4271 | ST_MAX_TAPE_ENTRIES, "st"); | |
4272 | if (err) { | |
4273 | printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", | |
4274 | SCSI_TAPE_MAJOR); | |
4275 | goto err_class; | |
1da177e4 LT |
4276 | } |
4277 | ||
13026a6b JG |
4278 | err = scsi_register_driver(&st_template.gendrv); |
4279 | if (err) | |
4280 | goto err_chrdev; | |
4281 | ||
405ae7d3 | 4282 | err = do_create_sysfs_files(); |
13026a6b JG |
4283 | if (err) |
4284 | goto err_scsidrv; | |
4285 | ||
4286 | return 0; | |
4287 | ||
4288 | err_scsidrv: | |
4289 | scsi_unregister_driver(&st_template.gendrv); | |
4290 | err_chrdev: | |
4291 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), | |
4292 | ST_MAX_TAPE_ENTRIES); | |
4293 | err_class: | |
4294 | class_destroy(st_sysfs_class); | |
4295 | return err; | |
1da177e4 LT |
4296 | } |
4297 | ||
4298 | static void __exit exit_st(void) | |
4299 | { | |
405ae7d3 | 4300 | do_remove_sysfs_files(); |
1da177e4 LT |
4301 | scsi_unregister_driver(&st_template.gendrv); |
4302 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), | |
4303 | ST_MAX_TAPE_ENTRIES); | |
c2c96f46 | 4304 | class_destroy(st_sysfs_class); |
1da177e4 LT |
4305 | kfree(scsi_tapes); |
4306 | printk(KERN_INFO "st: Unloaded.\n"); | |
4307 | } | |
4308 | ||
4309 | module_init(init_st); | |
4310 | module_exit(exit_st); | |
4311 | ||
4312 | ||
4313 | /* The sysfs driver interface. Read-only at the moment */ | |
4314 | static ssize_t st_try_direct_io_show(struct device_driver *ddp, char *buf) | |
4315 | { | |
4316 | return snprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); | |
4317 | } | |
4318 | static DRIVER_ATTR(try_direct_io, S_IRUGO, st_try_direct_io_show, NULL); | |
4319 | ||
4320 | static ssize_t st_fixed_buffer_size_show(struct device_driver *ddp, char *buf) | |
4321 | { | |
4322 | return snprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); | |
4323 | } | |
4324 | static DRIVER_ATTR(fixed_buffer_size, S_IRUGO, st_fixed_buffer_size_show, NULL); | |
4325 | ||
4326 | static ssize_t st_max_sg_segs_show(struct device_driver *ddp, char *buf) | |
4327 | { | |
4328 | return snprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); | |
4329 | } | |
4330 | static DRIVER_ATTR(max_sg_segs, S_IRUGO, st_max_sg_segs_show, NULL); | |
4331 | ||
4332 | static ssize_t st_version_show(struct device_driver *ddd, char *buf) | |
4333 | { | |
4334 | return snprintf(buf, PAGE_SIZE, "[%s]\n", verstr); | |
4335 | } | |
4336 | static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL); | |
4337 | ||
405ae7d3 | 4338 | static int do_create_sysfs_files(void) |
1da177e4 | 4339 | { |
405ae7d3 | 4340 | struct device_driver *sysfs = &st_template.gendrv; |
13026a6b JG |
4341 | int err; |
4342 | ||
405ae7d3 | 4343 | err = driver_create_file(sysfs, &driver_attr_try_direct_io); |
13026a6b JG |
4344 | if (err) |
4345 | return err; | |
405ae7d3 | 4346 | err = driver_create_file(sysfs, &driver_attr_fixed_buffer_size); |
13026a6b JG |
4347 | if (err) |
4348 | goto err_try_direct_io; | |
405ae7d3 | 4349 | err = driver_create_file(sysfs, &driver_attr_max_sg_segs); |
13026a6b JG |
4350 | if (err) |
4351 | goto err_attr_fixed_buf; | |
405ae7d3 | 4352 | err = driver_create_file(sysfs, &driver_attr_version); |
13026a6b JG |
4353 | if (err) |
4354 | goto err_attr_max_sg; | |
1da177e4 | 4355 | |
13026a6b JG |
4356 | return 0; |
4357 | ||
4358 | err_attr_max_sg: | |
405ae7d3 | 4359 | driver_remove_file(sysfs, &driver_attr_max_sg_segs); |
13026a6b | 4360 | err_attr_fixed_buf: |
405ae7d3 | 4361 | driver_remove_file(sysfs, &driver_attr_fixed_buffer_size); |
13026a6b | 4362 | err_try_direct_io: |
405ae7d3 | 4363 | driver_remove_file(sysfs, &driver_attr_try_direct_io); |
13026a6b | 4364 | return err; |
1da177e4 LT |
4365 | } |
4366 | ||
405ae7d3 | 4367 | static void do_remove_sysfs_files(void) |
1da177e4 | 4368 | { |
405ae7d3 | 4369 | struct device_driver *sysfs = &st_template.gendrv; |
1da177e4 | 4370 | |
405ae7d3 RD |
4371 | driver_remove_file(sysfs, &driver_attr_version); |
4372 | driver_remove_file(sysfs, &driver_attr_max_sg_segs); | |
4373 | driver_remove_file(sysfs, &driver_attr_fixed_buffer_size); | |
4374 | driver_remove_file(sysfs, &driver_attr_try_direct_io); | |
1da177e4 LT |
4375 | } |
4376 | ||
4377 | ||
4378 | /* The sysfs simple class interface */ | |
ee959b00 TJ |
4379 | static ssize_t |
4380 | st_defined_show(struct device *dev, struct device_attribute *attr, char *buf) | |
1da177e4 | 4381 | { |
7d15d6a4 | 4382 | struct st_modedef *STm = dev_get_drvdata(dev); |
1da177e4 LT |
4383 | ssize_t l = 0; |
4384 | ||
4385 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); | |
4386 | return l; | |
4387 | } | |
4388 | ||
ee959b00 | 4389 | DEVICE_ATTR(defined, S_IRUGO, st_defined_show, NULL); |
1da177e4 | 4390 | |
ee959b00 TJ |
4391 | static ssize_t |
4392 | st_defblk_show(struct device *dev, struct device_attribute *attr, char *buf) | |
1da177e4 | 4393 | { |
7d15d6a4 | 4394 | struct st_modedef *STm = dev_get_drvdata(dev); |
1da177e4 LT |
4395 | ssize_t l = 0; |
4396 | ||
4397 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); | |
4398 | return l; | |
4399 | } | |
4400 | ||
ee959b00 | 4401 | DEVICE_ATTR(default_blksize, S_IRUGO, st_defblk_show, NULL); |
1da177e4 | 4402 | |
ee959b00 TJ |
4403 | static ssize_t |
4404 | st_defdensity_show(struct device *dev, struct device_attribute *attr, char *buf) | |
1da177e4 | 4405 | { |
7d15d6a4 | 4406 | struct st_modedef *STm = dev_get_drvdata(dev); |
1da177e4 LT |
4407 | ssize_t l = 0; |
4408 | char *fmt; | |
4409 | ||
4410 | fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; | |
4411 | l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); | |
4412 | return l; | |
4413 | } | |
4414 | ||
ee959b00 | 4415 | DEVICE_ATTR(default_density, S_IRUGO, st_defdensity_show, NULL); |
1da177e4 | 4416 | |
ee959b00 TJ |
4417 | static ssize_t |
4418 | st_defcompression_show(struct device *dev, struct device_attribute *attr, | |
4419 | char *buf) | |
1da177e4 | 4420 | { |
7d15d6a4 | 4421 | struct st_modedef *STm = dev_get_drvdata(dev); |
1da177e4 LT |
4422 | ssize_t l = 0; |
4423 | ||
4424 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); | |
4425 | return l; | |
4426 | } | |
4427 | ||
ee959b00 | 4428 | DEVICE_ATTR(default_compression, S_IRUGO, st_defcompression_show, NULL); |
1da177e4 | 4429 | |
ee959b00 TJ |
4430 | static ssize_t |
4431 | st_options_show(struct device *dev, struct device_attribute *attr, char *buf) | |
b174be02 | 4432 | { |
7d15d6a4 | 4433 | struct st_modedef *STm = dev_get_drvdata(dev); |
b174be02 KM |
4434 | struct scsi_tape *STp; |
4435 | int i, j, options; | |
4436 | ssize_t l = 0; | |
4437 | ||
4438 | for (i=0; i < st_dev_max; i++) { | |
4439 | for (j=0; j < ST_NBR_MODES; j++) | |
4440 | if (&scsi_tapes[i]->modes[j] == STm) | |
4441 | break; | |
4442 | if (j < ST_NBR_MODES) | |
4443 | break; | |
4444 | } | |
4445 | if (i == st_dev_max) | |
4446 | return 0; /* should never happen */ | |
4447 | ||
4448 | STp = scsi_tapes[i]; | |
4449 | ||
4450 | options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; | |
4451 | options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; | |
4452 | options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; | |
4453 | DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); | |
4454 | options |= STp->two_fm ? MT_ST_TWO_FM : 0; | |
4455 | options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; | |
4456 | options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; | |
4457 | options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; | |
4458 | options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; | |
4459 | options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; | |
4460 | options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; | |
4461 | options |= STm->sysv ? MT_ST_SYSV : 0; | |
4462 | options |= STp->immediate ? MT_ST_NOWAIT : 0; | |
4463 | options |= STp->sili ? MT_ST_SILI : 0; | |
4464 | ||
4465 | l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); | |
4466 | return l; | |
4467 | } | |
4468 | ||
ee959b00 | 4469 | DEVICE_ATTR(options, S_IRUGO, st_options_show, NULL); |
b174be02 | 4470 | |
13026a6b | 4471 | static int do_create_class_files(struct scsi_tape *STp, int dev_num, int mode) |
1da177e4 LT |
4472 | { |
4473 | int i, rew, error; | |
4474 | char name[10]; | |
ee959b00 | 4475 | struct device *st_class_member; |
1da177e4 | 4476 | |
1da177e4 LT |
4477 | for (rew=0; rew < 2; rew++) { |
4478 | /* Make sure that the minor numbers corresponding to the four | |
4479 | first modes always get the same names */ | |
4480 | i = mode << (4 - ST_NBR_MODE_BITS); | |
4481 | snprintf(name, 10, "%s%s%s", rew ? "n" : "", | |
4482 | STp->disk->disk_name, st_formats[i]); | |
4483 | st_class_member = | |
d73a1a67 GKH |
4484 | device_create(st_sysfs_class, &STp->device->sdev_gendev, |
4485 | MKDEV(SCSI_TAPE_MAJOR, | |
4486 | TAPE_MINOR(dev_num, mode, rew)), | |
4487 | &STp->modes[mode], "%s", name); | |
1da177e4 | 4488 | if (IS_ERR(st_class_member)) { |
ee959b00 | 4489 | printk(KERN_WARNING "st%d: device_create failed\n", |
1da177e4 | 4490 | dev_num); |
13026a6b | 4491 | error = PTR_ERR(st_class_member); |
1da177e4 LT |
4492 | goto out; |
4493 | } | |
1da177e4 | 4494 | |
ee959b00 TJ |
4495 | error = device_create_file(st_class_member, |
4496 | &dev_attr_defined); | |
13026a6b | 4497 | if (error) goto out; |
ee959b00 TJ |
4498 | error = device_create_file(st_class_member, |
4499 | &dev_attr_default_blksize); | |
13026a6b | 4500 | if (error) goto out; |
ee959b00 TJ |
4501 | error = device_create_file(st_class_member, |
4502 | &dev_attr_default_density); | |
13026a6b | 4503 | if (error) goto out; |
ee959b00 TJ |
4504 | error = device_create_file(st_class_member, |
4505 | &dev_attr_default_compression); | |
13026a6b | 4506 | if (error) goto out; |
ee959b00 TJ |
4507 | error = device_create_file(st_class_member, |
4508 | &dev_attr_options); | |
b174be02 | 4509 | if (error) goto out; |
13026a6b | 4510 | |
1da177e4 LT |
4511 | if (mode == 0 && rew == 0) { |
4512 | error = sysfs_create_link(&STp->device->sdev_gendev.kobj, | |
4513 | &st_class_member->kobj, | |
4514 | "tape"); | |
4515 | if (error) { | |
4516 | printk(KERN_ERR | |
4517 | "st%d: Can't create sysfs link from SCSI device.\n", | |
4518 | dev_num); | |
13026a6b | 4519 | goto out; |
1da177e4 LT |
4520 | } |
4521 | } | |
4522 | } | |
13026a6b JG |
4523 | |
4524 | return 0; | |
4525 | ||
4526 | out: | |
4527 | return error; | |
1da177e4 LT |
4528 | } |
4529 | ||
1da177e4 | 4530 | /* The following functions may be useful for a larger audience. */ |
6620742f FT |
4531 | static int sgl_map_user_pages(struct st_buffer *STbp, |
4532 | const unsigned int max_pages, unsigned long uaddr, | |
4533 | size_t count, int rw) | |
1da177e4 | 4534 | { |
07542b83 JB |
4535 | unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; |
4536 | unsigned long start = uaddr >> PAGE_SHIFT; | |
4537 | const int nr_pages = end - start; | |
1da177e4 | 4538 | int res, i, j; |
1da177e4 | 4539 | struct page **pages; |
6620742f | 4540 | struct rq_map_data *mdata = &STbp->map_data; |
1da177e4 | 4541 | |
1da177e4 LT |
4542 | /* User attempted Overflow! */ |
4543 | if ((uaddr + count) < uaddr) | |
4544 | return -EINVAL; | |
4545 | ||
4546 | /* Too big */ | |
4547 | if (nr_pages > max_pages) | |
4548 | return -ENOMEM; | |
4549 | ||
4550 | /* Hmm? */ | |
4551 | if (count == 0) | |
4552 | return 0; | |
4553 | ||
4554 | if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL) | |
4555 | return -ENOMEM; | |
4556 | ||
4557 | /* Try to fault in all of the necessary pages */ | |
4558 | down_read(¤t->mm->mmap_sem); | |
4559 | /* rw==READ means read from drive, write into memory area */ | |
4560 | res = get_user_pages( | |
4561 | current, | |
4562 | current->mm, | |
4563 | uaddr, | |
4564 | nr_pages, | |
4565 | rw == READ, | |
4566 | 0, /* don't force */ | |
4567 | pages, | |
4568 | NULL); | |
4569 | up_read(¤t->mm->mmap_sem); | |
4570 | ||
4571 | /* Errors and no page mapped should return here */ | |
4572 | if (res < nr_pages) | |
4573 | goto out_unmap; | |
4574 | ||
4575 | for (i=0; i < nr_pages; i++) { | |
4576 | /* FIXME: flush superflous for rw==READ, | |
4577 | * probably wrong function for rw==WRITE | |
4578 | */ | |
4579 | flush_dcache_page(pages[i]); | |
4580 | } | |
4581 | ||
6620742f FT |
4582 | mdata->offset = uaddr & ~PAGE_MASK; |
4583 | mdata->page_order = 0; | |
4584 | STbp->mapped_pages = pages; | |
1da177e4 | 4585 | |
1da177e4 | 4586 | return nr_pages; |
1da177e4 LT |
4587 | out_unmap: |
4588 | if (res > 0) { | |
4589 | for (j=0; j < res; j++) | |
4590 | page_cache_release(pages[j]); | |
6bc733e9 | 4591 | res = 0; |
1da177e4 LT |
4592 | } |
4593 | kfree(pages); | |
4594 | return res; | |
4595 | } | |
4596 | ||
4597 | ||
4598 | /* And unmap them... */ | |
6620742f FT |
4599 | static int sgl_unmap_user_pages(struct st_buffer *STbp, |
4600 | const unsigned int nr_pages, int dirtied) | |
1da177e4 LT |
4601 | { |
4602 | int i; | |
4603 | ||
4604 | for (i=0; i < nr_pages; i++) { | |
6620742f | 4605 | struct page *page = STbp->mapped_pages[i]; |
b5810039 | 4606 | |
b5810039 NP |
4607 | if (dirtied) |
4608 | SetPageDirty(page); | |
1da177e4 LT |
4609 | /* FIXME: cache flush missing for rw==READ |
4610 | * FIXME: call the correct reference counting function | |
4611 | */ | |
b5810039 | 4612 | page_cache_release(page); |
1da177e4 | 4613 | } |
6620742f FT |
4614 | kfree(STbp->mapped_pages); |
4615 | STbp->mapped_pages = NULL; | |
1da177e4 LT |
4616 | |
4617 | return 0; | |
4618 | } |