Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying | |
3 | file Documentation/scsi/st.txt for more information. | |
4 | ||
5 | History: | |
6 | Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara. | |
7 | Contribution and ideas from several people including (in alphabetical | |
8 | order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk, | |
9 | Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky, | |
10 | Michael Schaefer, J"org Weule, and Eric Youngdale. | |
11 | ||
3e51d3c9 | 12 | Copyright 1992 - 2010 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 | ||
373daacf | 20 | static const char *verstr = "20101219"; |
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> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
1da177e4 LT |
31 | #include <linux/errno.h> |
32 | #include <linux/mtio.h> | |
16c4b3e2 | 33 | #include <linux/cdrom.h> |
1da177e4 LT |
34 | #include <linux/ioctl.h> |
35 | #include <linux/fcntl.h> | |
36 | #include <linux/spinlock.h> | |
37 | #include <linux/blkdev.h> | |
38 | #include <linux/moduleparam.h> | |
1da177e4 LT |
39 | #include <linux/cdev.h> |
40 | #include <linux/delay.h> | |
0b950672 | 41 | #include <linux/mutex.h> |
1da177e4 LT |
42 | |
43 | #include <asm/uaccess.h> | |
44 | #include <asm/dma.h> | |
1da177e4 LT |
45 | |
46 | #include <scsi/scsi.h> | |
47 | #include <scsi/scsi_dbg.h> | |
48 | #include <scsi/scsi_device.h> | |
49 | #include <scsi/scsi_driver.h> | |
50 | #include <scsi/scsi_eh.h> | |
51 | #include <scsi/scsi_host.h> | |
52 | #include <scsi/scsi_ioctl.h> | |
16c4b3e2 | 53 | #include <scsi/sg.h> |
1da177e4 LT |
54 | |
55 | ||
56 | /* The driver prints some debugging information on the console if DEBUG | |
57 | is defined and non-zero. */ | |
58 | #define DEBUG 0 | |
59 | ||
60 | #if DEBUG | |
61 | /* The message level for the debug messages is currently set to KERN_NOTICE | |
62 | so that people can easily see the messages. Later when the debugging messages | |
63 | in the drivers are more widely classified, this may be changed to KERN_DEBUG. */ | |
64 | #define ST_DEB_MSG KERN_NOTICE | |
65 | #define DEB(a) a | |
66 | #define DEBC(a) if (debugging) { a ; } | |
67 | #else | |
68 | #define DEB(a) | |
69 | #define DEBC(a) | |
70 | #endif | |
71 | ||
72 | #define ST_KILOBYTE 1024 | |
73 | ||
74 | #include "st_options.h" | |
75 | #include "st.h" | |
76 | ||
2a48fc0a | 77 | static DEFINE_MUTEX(st_mutex); |
1da177e4 LT |
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 | ||
af23782b JM |
87 | static struct class st_sysfs_class; |
88 | static struct device_attribute st_dev_attrs[]; | |
1da177e4 LT |
89 | |
90 | MODULE_AUTHOR("Kai Makisara"); | |
f018fa55 | 91 | MODULE_DESCRIPTION("SCSI tape (st) driver"); |
1da177e4 | 92 | MODULE_LICENSE("GPL"); |
f018fa55 | 93 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR); |
d7b8bcb0 | 94 | MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE); |
1da177e4 LT |
95 | |
96 | /* Set 'perm' (4th argument) to 0 to disable module_param's definition | |
97 | * of sysfs parameters (which module_param doesn't yet support). | |
98 | * Sysfs parameters defined explicitly later. | |
99 | */ | |
100 | module_param_named(buffer_kbs, buffer_kbs, int, 0); | |
101 | MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)"); | |
102 | module_param_named(max_sg_segs, max_sg_segs, int, 0); | |
103 | MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)"); | |
104 | module_param_named(try_direct_io, try_direct_io, int, 0); | |
105 | MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)"); | |
106 | ||
107 | /* Extra parameters for testing */ | |
108 | module_param_named(try_rdio, try_rdio, int, 0); | |
109 | MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); | |
110 | module_param_named(try_wdio, try_wdio, int, 0); | |
111 | MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); | |
112 | ||
113 | #ifndef MODULE | |
114 | static int write_threshold_kbs; /* retained for compatibility */ | |
115 | static struct st_dev_parm { | |
116 | char *name; | |
117 | int *val; | |
118 | } parms[] __initdata = { | |
119 | { | |
120 | "buffer_kbs", &buffer_kbs | |
121 | }, | |
122 | { /* Retained for compatibility with 2.4 */ | |
123 | "write_threshold_kbs", &write_threshold_kbs | |
124 | }, | |
125 | { | |
126 | "max_sg_segs", NULL | |
127 | }, | |
128 | { | |
129 | "try_direct_io", &try_direct_io | |
130 | } | |
131 | }; | |
132 | #endif | |
133 | ||
134 | /* Restrict the number of modes so that names for all are assigned */ | |
135 | #if ST_NBR_MODES > 16 | |
136 | #error "Maximum number of modes is 16" | |
137 | #endif | |
138 | /* Bit reversed order to get same names for same minors with all | |
139 | mode counts */ | |
0ad78200 | 140 | static const char *st_formats[] = { |
1da177e4 LT |
141 | "", "r", "k", "s", "l", "t", "o", "u", |
142 | "m", "v", "p", "x", "a", "y", "q", "z"}; | |
143 | ||
144 | /* The default definitions have been moved to st_options.h */ | |
145 | ||
146 | #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) | |
147 | ||
148 | /* The buffer size should fit into the 24 bits for length in the | |
149 | 6-byte SCSI read and write commands. */ | |
150 | #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) | |
151 | #error "Buffer size should not exceed (2 << 24 - 1) bytes!" | |
152 | #endif | |
153 | ||
154 | static int debugging = DEBUG; | |
155 | ||
156 | #define MAX_RETRIES 0 | |
157 | #define MAX_WRITE_RETRIES 0 | |
158 | #define MAX_READY_RETRIES 0 | |
159 | #define NO_TAPE NOT_READY | |
160 | ||
161 | #define ST_TIMEOUT (900 * HZ) | |
162 | #define ST_LONG_TIMEOUT (14000 * HZ) | |
163 | ||
164 | /* Remove mode bits and auto-rewind bit (7) */ | |
165 | #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ | |
166 | (iminor(x) & ~(-1 << ST_MODE_SHIFT)) ) | |
167 | #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) | |
168 | ||
169 | /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ | |
170 | #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ | |
171 | (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) | |
172 | ||
173 | /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower | |
174 | 24 bits) */ | |
175 | #define SET_DENS_AND_BLK 0x10001 | |
176 | ||
177 | static DEFINE_RWLOCK(st_dev_arr_lock); | |
178 | ||
179 | static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; | |
180 | static int st_max_sg_segs = ST_MAX_SG; | |
181 | ||
182 | static struct scsi_tape **scsi_tapes = NULL; | |
183 | ||
184 | static int modes_defined; | |
185 | ||
1da177e4 | 186 | static int enlarge_buffer(struct st_buffer *, int, int); |
40f6b36c | 187 | static void clear_buffer(struct st_buffer *); |
1da177e4 LT |
188 | static void normalize_buffer(struct st_buffer *); |
189 | static int append_to_buffer(const char __user *, struct st_buffer *, int); | |
190 | static int from_buffer(struct st_buffer *, char __user *, int); | |
191 | static void move_buffer_data(struct st_buffer *, int); | |
1da177e4 | 192 | |
6620742f | 193 | static int sgl_map_user_pages(struct st_buffer *, const unsigned int, |
1da177e4 | 194 | unsigned long, size_t, int); |
6620742f | 195 | static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int); |
1da177e4 LT |
196 | |
197 | static int st_probe(struct device *); | |
198 | static int st_remove(struct device *); | |
1da177e4 | 199 | |
405ae7d3 RD |
200 | static int do_create_sysfs_files(void); |
201 | static void do_remove_sysfs_files(void); | |
13026a6b | 202 | static int do_create_class_files(struct scsi_tape *, int, int); |
1da177e4 LT |
203 | |
204 | static struct scsi_driver st_template = { | |
205 | .owner = THIS_MODULE, | |
206 | .gendrv = { | |
207 | .name = "st", | |
208 | .probe = st_probe, | |
209 | .remove = st_remove, | |
210 | }, | |
1da177e4 LT |
211 | }; |
212 | ||
213 | static int st_compression(struct scsi_tape *, int); | |
214 | ||
215 | static int find_partition(struct scsi_tape *); | |
216 | static int switch_partition(struct scsi_tape *); | |
217 | ||
218 | static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); | |
219 | ||
f03a5670 KM |
220 | static void scsi_tape_release(struct kref *); |
221 | ||
222 | #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref) | |
223 | ||
0b950672 | 224 | static DEFINE_MUTEX(st_ref_mutex); |
f03a5670 | 225 | |
1da177e4 LT |
226 | \f |
227 | #include "osst_detect.h" | |
228 | #ifndef SIGS_FROM_OSST | |
229 | #define SIGS_FROM_OSST \ | |
230 | {"OnStream", "SC-", "", "osst"}, \ | |
231 | {"OnStream", "DI-", "", "osst"}, \ | |
232 | {"OnStream", "DP-", "", "osst"}, \ | |
233 | {"OnStream", "USB", "", "osst"}, \ | |
234 | {"OnStream", "FW-", "", "osst"} | |
235 | #endif | |
236 | ||
f03a5670 KM |
237 | static struct scsi_tape *scsi_tape_get(int dev) |
238 | { | |
239 | struct scsi_tape *STp = NULL; | |
240 | ||
0b950672 | 241 | mutex_lock(&st_ref_mutex); |
f03a5670 KM |
242 | write_lock(&st_dev_arr_lock); |
243 | ||
244 | if (dev < st_dev_max && scsi_tapes != NULL) | |
245 | STp = scsi_tapes[dev]; | |
246 | if (!STp) goto out; | |
247 | ||
248 | kref_get(&STp->kref); | |
249 | ||
250 | if (!STp->device) | |
251 | goto out_put; | |
252 | ||
253 | if (scsi_device_get(STp->device)) | |
254 | goto out_put; | |
255 | ||
256 | goto out; | |
257 | ||
258 | out_put: | |
259 | kref_put(&STp->kref, scsi_tape_release); | |
260 | STp = NULL; | |
261 | out: | |
262 | write_unlock(&st_dev_arr_lock); | |
0b950672 | 263 | mutex_unlock(&st_ref_mutex); |
f03a5670 KM |
264 | return STp; |
265 | } | |
266 | ||
267 | static void scsi_tape_put(struct scsi_tape *STp) | |
268 | { | |
269 | struct scsi_device *sdev = STp->device; | |
270 | ||
0b950672 | 271 | mutex_lock(&st_ref_mutex); |
f03a5670 KM |
272 | kref_put(&STp->kref, scsi_tape_release); |
273 | scsi_device_put(sdev); | |
0b950672 | 274 | mutex_unlock(&st_ref_mutex); |
f03a5670 KM |
275 | } |
276 | ||
1da177e4 LT |
277 | struct st_reject_data { |
278 | char *vendor; | |
279 | char *model; | |
280 | char *rev; | |
281 | char *driver_hint; /* Name of the correct driver, NULL if unknown */ | |
282 | }; | |
283 | ||
284 | static struct st_reject_data reject_list[] = { | |
285 | /* {"XXX", "Yy-", "", NULL}, example */ | |
286 | SIGS_FROM_OSST, | |
287 | {NULL, }}; | |
288 | ||
289 | /* If the device signature is on the list of incompatible drives, the | |
290 | function returns a pointer to the name of the correct driver (if known) */ | |
291 | static char * st_incompatible(struct scsi_device* SDp) | |
292 | { | |
293 | struct st_reject_data *rp; | |
294 | ||
295 | for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) | |
296 | if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && | |
297 | !strncmp(rp->model, SDp->model, strlen(rp->model)) && | |
298 | !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { | |
299 | if (rp->driver_hint) | |
300 | return rp->driver_hint; | |
301 | else | |
302 | return "unknown"; | |
303 | } | |
304 | return NULL; | |
305 | } | |
306 | \f | |
307 | ||
308 | static inline char *tape_name(struct scsi_tape *tape) | |
309 | { | |
310 | return tape->disk->disk_name; | |
311 | } | |
312 | ||
313 | ||
8b05b773 | 314 | static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s) |
1da177e4 LT |
315 | { |
316 | const u8 *ucp; | |
8b05b773 | 317 | const u8 *sense = SRpnt->sense; |
1da177e4 | 318 | |
8b05b773 MC |
319 | s->have_sense = scsi_normalize_sense(SRpnt->sense, |
320 | SCSI_SENSE_BUFFERSIZE, &s->sense_hdr); | |
1da177e4 LT |
321 | s->flags = 0; |
322 | ||
323 | if (s->have_sense) { | |
324 | s->deferred = 0; | |
325 | s->remainder_valid = | |
326 | scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); | |
327 | switch (sense[0] & 0x7f) { | |
328 | case 0x71: | |
329 | s->deferred = 1; | |
330 | case 0x70: | |
331 | s->fixed_format = 1; | |
332 | s->flags = sense[2] & 0xe0; | |
333 | break; | |
334 | case 0x73: | |
335 | s->deferred = 1; | |
336 | case 0x72: | |
337 | s->fixed_format = 0; | |
338 | ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); | |
339 | s->flags = ucp ? (ucp[3] & 0xe0) : 0; | |
340 | break; | |
341 | } | |
342 | } | |
343 | } | |
344 | ||
345 | ||
346 | /* Convert the result to success code */ | |
8b05b773 | 347 | static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt) |
1da177e4 | 348 | { |
8b05b773 | 349 | int result = SRpnt->result; |
1da177e4 LT |
350 | u8 scode; |
351 | DEB(const char *stp;) | |
352 | char *name = tape_name(STp); | |
353 | struct st_cmdstatus *cmdstatp; | |
354 | ||
355 | if (!result) | |
356 | return 0; | |
357 | ||
358 | cmdstatp = &STp->buffer->cmdstat; | |
f03a5670 | 359 | st_analyze_sense(SRpnt, cmdstatp); |
1da177e4 LT |
360 | |
361 | if (cmdstatp->have_sense) | |
362 | scode = STp->buffer->cmdstat.sense_hdr.sense_key; | |
363 | else | |
364 | scode = 0; | |
365 | ||
366 | DEB( | |
367 | if (debugging) { | |
8b05b773 | 368 | printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x\n", |
1da177e4 | 369 | name, result, |
8b05b773 MC |
370 | SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2], |
371 | SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]); | |
1da177e4 | 372 | if (cmdstatp->have_sense) |
4e73ea7b | 373 | __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE); |
1da177e4 LT |
374 | } ) /* end DEB */ |
375 | if (!debugging) { /* Abnormal conditions for tape */ | |
376 | if (!cmdstatp->have_sense) | |
377 | printk(KERN_WARNING | |
1c9fbafc MP |
378 | "%s: Error %x (driver bt 0x%x, host bt 0x%x).\n", |
379 | name, result, driver_byte(result), | |
380 | host_byte(result)); | |
1da177e4 LT |
381 | else if (cmdstatp->have_sense && |
382 | scode != NO_SENSE && | |
383 | scode != RECOVERED_ERROR && | |
384 | /* scode != UNIT_ATTENTION && */ | |
385 | scode != BLANK_CHECK && | |
386 | scode != VOLUME_OVERFLOW && | |
8b05b773 MC |
387 | SRpnt->cmd[0] != MODE_SENSE && |
388 | SRpnt->cmd[0] != TEST_UNIT_READY) { | |
4e73ea7b LT |
389 | |
390 | __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE); | |
1da177e4 LT |
391 | } |
392 | } | |
393 | ||
394 | if (cmdstatp->fixed_format && | |
395 | STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ | |
396 | if (STp->cln_sense_value) | |
8b05b773 | 397 | STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & |
1da177e4 LT |
398 | STp->cln_sense_mask) == STp->cln_sense_value); |
399 | else | |
8b05b773 | 400 | STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & |
1da177e4 LT |
401 | STp->cln_sense_mask) != 0); |
402 | } | |
403 | if (cmdstatp->have_sense && | |
404 | cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17) | |
405 | STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */ | |
406 | ||
407 | STp->pos_unknown |= STp->device->was_reset; | |
408 | ||
409 | if (cmdstatp->have_sense && | |
410 | scode == RECOVERED_ERROR | |
411 | #if ST_RECOVERED_WRITE_FATAL | |
8b05b773 MC |
412 | && SRpnt->cmd[0] != WRITE_6 |
413 | && SRpnt->cmd[0] != WRITE_FILEMARKS | |
1da177e4 LT |
414 | #endif |
415 | ) { | |
416 | STp->recover_count++; | |
417 | STp->recover_reg++; | |
418 | ||
419 | DEB( | |
420 | if (debugging) { | |
8b05b773 | 421 | if (SRpnt->cmd[0] == READ_6) |
1da177e4 | 422 | stp = "read"; |
8b05b773 | 423 | else if (SRpnt->cmd[0] == WRITE_6) |
1da177e4 LT |
424 | stp = "write"; |
425 | else | |
426 | stp = "ioctl"; | |
427 | printk(ST_DEB_MSG "%s: Recovered %s error (%d).\n", name, stp, | |
428 | STp->recover_count); | |
429 | } ) /* end DEB */ | |
430 | ||
431 | if (cmdstatp->flags == 0) | |
432 | return 0; | |
433 | } | |
434 | return (-EIO); | |
435 | } | |
436 | ||
4deba245 | 437 | static struct st_request *st_allocate_request(struct scsi_tape *stp) |
8b05b773 | 438 | { |
4deba245 FT |
439 | struct st_request *streq; |
440 | ||
441 | streq = kzalloc(sizeof(*streq), GFP_KERNEL); | |
442 | if (streq) | |
443 | streq->stp = stp; | |
444 | else { | |
445 | DEBC(printk(KERN_ERR "%s: Can't get SCSI request.\n", | |
446 | tape_name(stp));); | |
447 | if (signal_pending(current)) | |
448 | stp->buffer->syscall_result = -EINTR; | |
449 | else | |
450 | stp->buffer->syscall_result = -EBUSY; | |
451 | } | |
452 | ||
453 | return streq; | |
8b05b773 MC |
454 | } |
455 | ||
456 | static void st_release_request(struct st_request *streq) | |
457 | { | |
458 | kfree(streq); | |
1da177e4 LT |
459 | } |
460 | ||
13b53b44 FT |
461 | static void st_scsi_execute_end(struct request *req, int uptodate) |
462 | { | |
463 | struct st_request *SRpnt = req->end_io_data; | |
464 | struct scsi_tape *STp = SRpnt->stp; | |
c68bf8ee | 465 | struct bio *tmp; |
13b53b44 FT |
466 | |
467 | STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors; | |
c3a4d78c | 468 | STp->buffer->cmdstat.residual = req->resid_len; |
13b53b44 | 469 | |
c68bf8ee | 470 | tmp = SRpnt->bio; |
13b53b44 FT |
471 | if (SRpnt->waiting) |
472 | complete(SRpnt->waiting); | |
473 | ||
c68bf8ee | 474 | blk_rq_unmap_user(tmp); |
13b53b44 FT |
475 | __blk_put_request(req->q, req); |
476 | } | |
477 | ||
478 | static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, | |
479 | int data_direction, void *buffer, unsigned bufflen, | |
480 | int timeout, int retries) | |
481 | { | |
482 | struct request *req; | |
483 | struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data; | |
484 | int err = 0; | |
485 | int write = (data_direction == DMA_TO_DEVICE); | |
486 | ||
487 | req = blk_get_request(SRpnt->stp->device->request_queue, write, | |
488 | GFP_KERNEL); | |
489 | if (!req) | |
490 | return DRIVER_ERROR << 24; | |
491 | ||
492 | req->cmd_type = REQ_TYPE_BLOCK_PC; | |
493 | req->cmd_flags |= REQ_QUIET; | |
494 | ||
495 | mdata->null_mapped = 1; | |
496 | ||
02ae2c0e KM |
497 | if (bufflen) { |
498 | err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, | |
499 | GFP_KERNEL); | |
500 | if (err) { | |
501 | blk_put_request(req); | |
502 | return DRIVER_ERROR << 24; | |
503 | } | |
13b53b44 FT |
504 | } |
505 | ||
506 | SRpnt->bio = req->bio; | |
507 | req->cmd_len = COMMAND_SIZE(cmd[0]); | |
508 | memset(req->cmd, 0, BLK_MAX_CDB); | |
509 | memcpy(req->cmd, cmd, req->cmd_len); | |
510 | req->sense = SRpnt->sense; | |
511 | req->sense_len = 0; | |
512 | req->timeout = timeout; | |
513 | req->retries = retries; | |
514 | req->end_io_data = SRpnt; | |
515 | ||
516 | blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end); | |
517 | return 0; | |
518 | } | |
519 | ||
1da177e4 LT |
520 | /* Do the scsi command. Waits until command performed if do_wait is true. |
521 | Otherwise write_behind_check() is used to check that the command | |
522 | has finished. */ | |
8b05b773 MC |
523 | static struct st_request * |
524 | st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, | |
1da177e4 LT |
525 | int bytes, int direction, int timeout, int retries, int do_wait) |
526 | { | |
f03a5670 | 527 | struct completion *waiting; |
6d476267 FT |
528 | struct rq_map_data *mdata = &STp->buffer->map_data; |
529 | int ret; | |
1da177e4 | 530 | |
f03a5670 KM |
531 | /* if async, make sure there's no command outstanding */ |
532 | if (!do_wait && ((STp->buffer)->last_SRpnt)) { | |
533 | printk(KERN_ERR "%s: Async command already active.\n", | |
534 | tape_name(STp)); | |
535 | if (signal_pending(current)) | |
536 | (STp->buffer)->syscall_result = (-EINTR); | |
537 | else | |
538 | (STp->buffer)->syscall_result = (-EBUSY); | |
539 | return NULL; | |
540 | } | |
541 | ||
4deba245 FT |
542 | if (!SRpnt) { |
543 | SRpnt = st_allocate_request(STp); | |
544 | if (!SRpnt) | |
1da177e4 | 545 | return NULL; |
1da177e4 LT |
546 | } |
547 | ||
f03a5670 KM |
548 | /* If async IO, set last_SRpnt. This ptr tells write_behind_check |
549 | which IO is outstanding. It's nulled out when the IO completes. */ | |
550 | if (!do_wait) | |
551 | (STp->buffer)->last_SRpnt = SRpnt; | |
552 | ||
553 | waiting = &STp->wait; | |
554 | init_completion(waiting); | |
8b05b773 | 555 | SRpnt->waiting = waiting; |
1da177e4 | 556 | |
6620742f | 557 | if (STp->buffer->do_dio) { |
c982c368 | 558 | mdata->page_order = 0; |
6620742f FT |
559 | mdata->nr_entries = STp->buffer->sg_segs; |
560 | mdata->pages = STp->buffer->mapped_pages; | |
561 | } else { | |
c982c368 | 562 | mdata->page_order = STp->buffer->reserved_page_order; |
6d476267 FT |
563 | mdata->nr_entries = |
564 | DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order); | |
c982c368 FT |
565 | mdata->pages = STp->buffer->reserved_pages; |
566 | mdata->offset = 0; | |
6d476267 FT |
567 | } |
568 | ||
8b05b773 MC |
569 | memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd)); |
570 | STp->buffer->cmdstat.have_sense = 0; | |
571 | STp->buffer->syscall_result = 0; | |
572 | ||
6620742f FT |
573 | ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout, |
574 | retries); | |
6d476267 | 575 | if (ret) { |
8b05b773 MC |
576 | /* could not allocate the buffer or request was too large */ |
577 | (STp->buffer)->syscall_result = (-EBUSY); | |
787926b1 | 578 | (STp->buffer)->last_SRpnt = NULL; |
6d476267 | 579 | } else if (do_wait) { |
f03a5670 | 580 | wait_for_completion(waiting); |
8b05b773 | 581 | SRpnt->waiting = NULL; |
1da177e4 LT |
582 | (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); |
583 | } | |
8b05b773 | 584 | |
1da177e4 LT |
585 | return SRpnt; |
586 | } | |
587 | ||
588 | ||
589 | /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if | |
590 | write has been correct but EOM early warning reached, -EIO if write ended in | |
591 | error or zero if write successful. Asynchronous writes are used only in | |
592 | variable block mode. */ | |
593 | static int write_behind_check(struct scsi_tape * STp) | |
594 | { | |
595 | int retval = 0; | |
596 | struct st_buffer *STbuffer; | |
597 | struct st_partstat *STps; | |
598 | struct st_cmdstatus *cmdstatp; | |
8b05b773 | 599 | struct st_request *SRpnt; |
1da177e4 LT |
600 | |
601 | STbuffer = STp->buffer; | |
602 | if (!STbuffer->writing) | |
603 | return 0; | |
604 | ||
605 | DEB( | |
606 | if (STp->write_pending) | |
607 | STp->nbr_waits++; | |
608 | else | |
609 | STp->nbr_finished++; | |
610 | ) /* end DEB */ | |
611 | ||
612 | wait_for_completion(&(STp->wait)); | |
f03a5670 KM |
613 | SRpnt = STbuffer->last_SRpnt; |
614 | STbuffer->last_SRpnt = NULL; | |
8b05b773 | 615 | SRpnt->waiting = NULL; |
1da177e4 | 616 | |
f03a5670 | 617 | (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); |
8b05b773 | 618 | st_release_request(SRpnt); |
1da177e4 LT |
619 | |
620 | STbuffer->buffer_bytes -= STbuffer->writing; | |
621 | STps = &(STp->ps[STp->partition]); | |
622 | if (STps->drv_block >= 0) { | |
623 | if (STp->block_size == 0) | |
624 | STps->drv_block++; | |
625 | else | |
626 | STps->drv_block += STbuffer->writing / STp->block_size; | |
627 | } | |
628 | ||
629 | cmdstatp = &STbuffer->cmdstat; | |
630 | if (STbuffer->syscall_result) { | |
631 | retval = -EIO; | |
632 | if (cmdstatp->have_sense && !cmdstatp->deferred && | |
633 | (cmdstatp->flags & SENSE_EOM) && | |
634 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
635 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) { | |
636 | /* EOM at write-behind, has all data been written? */ | |
637 | if (!cmdstatp->remainder_valid || | |
638 | cmdstatp->uremainder64 == 0) | |
639 | retval = -ENOSPC; | |
640 | } | |
641 | if (retval == -EIO) | |
642 | STps->drv_block = -1; | |
643 | } | |
644 | STbuffer->writing = 0; | |
645 | ||
646 | DEB(if (debugging && retval) | |
647 | printk(ST_DEB_MSG "%s: Async write error %x, return value %d.\n", | |
648 | tape_name(STp), STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */ | |
649 | ||
650 | return retval; | |
651 | } | |
652 | ||
653 | ||
654 | /* Step over EOF if it has been inadvertently crossed (ioctl not used because | |
655 | it messes up the block number). */ | |
656 | static int cross_eof(struct scsi_tape * STp, int forward) | |
657 | { | |
8b05b773 | 658 | struct st_request *SRpnt; |
1da177e4 LT |
659 | unsigned char cmd[MAX_COMMAND_SIZE]; |
660 | ||
661 | cmd[0] = SPACE; | |
662 | cmd[1] = 0x01; /* Space FileMarks */ | |
663 | if (forward) { | |
664 | cmd[2] = cmd[3] = 0; | |
665 | cmd[4] = 1; | |
666 | } else | |
667 | cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ | |
668 | cmd[5] = 0; | |
669 | ||
670 | DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n", | |
671 | tape_name(STp), forward ? "forward" : "backward")); | |
672 | ||
02ae2c0e KM |
673 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
674 | STp->device->request_queue->rq_timeout, | |
675 | MAX_RETRIES, 1); | |
1da177e4 | 676 | if (!SRpnt) |
02ae2c0e | 677 | return (STp->buffer)->syscall_result; |
39ade4b1 | 678 | |
02ae2c0e KM |
679 | st_release_request(SRpnt); |
680 | SRpnt = NULL; | |
1da177e4 LT |
681 | |
682 | if ((STp->buffer)->cmdstat.midlevel_result != 0) | |
683 | printk(KERN_ERR "%s: Stepping over filemark %s failed.\n", | |
684 | tape_name(STp), forward ? "forward" : "backward"); | |
685 | ||
02ae2c0e | 686 | return (STp->buffer)->syscall_result; |
1da177e4 LT |
687 | } |
688 | ||
689 | ||
690 | /* Flush the write buffer (never need to write if variable blocksize). */ | |
8ef8d594 | 691 | static int st_flush_write_buffer(struct scsi_tape * STp) |
1da177e4 | 692 | { |
786231af | 693 | int transfer, blks; |
1da177e4 LT |
694 | int result; |
695 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 696 | struct st_request *SRpnt; |
1da177e4 LT |
697 | struct st_partstat *STps; |
698 | ||
699 | result = write_behind_check(STp); | |
700 | if (result) | |
701 | return result; | |
702 | ||
703 | result = 0; | |
704 | if (STp->dirty == 1) { | |
705 | ||
786231af | 706 | transfer = STp->buffer->buffer_bytes; |
1da177e4 LT |
707 | DEBC(printk(ST_DEB_MSG "%s: Flushing %d bytes.\n", |
708 | tape_name(STp), transfer)); | |
709 | ||
1da177e4 LT |
710 | memset(cmd, 0, MAX_COMMAND_SIZE); |
711 | cmd[0] = WRITE_6; | |
712 | cmd[1] = 1; | |
713 | blks = transfer / STp->block_size; | |
714 | cmd[2] = blks >> 16; | |
715 | cmd[3] = blks >> 8; | |
716 | cmd[4] = blks; | |
717 | ||
718 | SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE, | |
a02488ed JB |
719 | STp->device->request_queue->rq_timeout, |
720 | MAX_WRITE_RETRIES, 1); | |
1da177e4 LT |
721 | if (!SRpnt) |
722 | return (STp->buffer)->syscall_result; | |
723 | ||
724 | STps = &(STp->ps[STp->partition]); | |
725 | if ((STp->buffer)->syscall_result != 0) { | |
726 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
727 | ||
728 | if (cmdstatp->have_sense && !cmdstatp->deferred && | |
729 | (cmdstatp->flags & SENSE_EOM) && | |
730 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
731 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && | |
732 | (!cmdstatp->remainder_valid || | |
733 | cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */ | |
734 | STp->dirty = 0; | |
735 | (STp->buffer)->buffer_bytes = 0; | |
736 | if (STps->drv_block >= 0) | |
737 | STps->drv_block += blks; | |
738 | result = (-ENOSPC); | |
739 | } else { | |
740 | printk(KERN_ERR "%s: Error on flush.\n", | |
741 | tape_name(STp)); | |
742 | STps->drv_block = (-1); | |
743 | result = (-EIO); | |
744 | } | |
745 | } else { | |
746 | if (STps->drv_block >= 0) | |
747 | STps->drv_block += blks; | |
748 | STp->dirty = 0; | |
749 | (STp->buffer)->buffer_bytes = 0; | |
750 | } | |
8b05b773 | 751 | st_release_request(SRpnt); |
1da177e4 LT |
752 | SRpnt = NULL; |
753 | } | |
754 | return result; | |
755 | } | |
756 | ||
757 | ||
758 | /* Flush the tape buffer. The tape will be positioned correctly unless | |
759 | seek_next is true. */ | |
760 | static int flush_buffer(struct scsi_tape *STp, int seek_next) | |
761 | { | |
762 | int backspace, result; | |
763 | struct st_buffer *STbuffer; | |
764 | struct st_partstat *STps; | |
765 | ||
766 | STbuffer = STp->buffer; | |
767 | ||
768 | /* | |
769 | * If there was a bus reset, block further access | |
770 | * to this device. | |
771 | */ | |
772 | if (STp->pos_unknown) | |
773 | return (-EIO); | |
774 | ||
775 | if (STp->ready != ST_READY) | |
776 | return 0; | |
777 | STps = &(STp->ps[STp->partition]); | |
778 | if (STps->rw == ST_WRITING) /* Writing */ | |
8ef8d594 | 779 | return st_flush_write_buffer(STp); |
1da177e4 LT |
780 | |
781 | if (STp->block_size == 0) | |
782 | return 0; | |
783 | ||
784 | backspace = ((STp->buffer)->buffer_bytes + | |
785 | (STp->buffer)->read_pointer) / STp->block_size - | |
786 | ((STp->buffer)->read_pointer + STp->block_size - 1) / | |
787 | STp->block_size; | |
788 | (STp->buffer)->buffer_bytes = 0; | |
789 | (STp->buffer)->read_pointer = 0; | |
790 | result = 0; | |
791 | if (!seek_next) { | |
792 | if (STps->eof == ST_FM_HIT) { | |
793 | result = cross_eof(STp, 0); /* Back over the EOF hit */ | |
794 | if (!result) | |
795 | STps->eof = ST_NOEOF; | |
796 | else { | |
797 | if (STps->drv_file >= 0) | |
798 | STps->drv_file++; | |
799 | STps->drv_block = 0; | |
800 | } | |
801 | } | |
802 | if (!result && backspace > 0) | |
803 | result = st_int_ioctl(STp, MTBSR, backspace); | |
804 | } else if (STps->eof == ST_FM_HIT) { | |
805 | if (STps->drv_file >= 0) | |
806 | STps->drv_file++; | |
807 | STps->drv_block = 0; | |
808 | STps->eof = ST_NOEOF; | |
809 | } | |
810 | return result; | |
811 | ||
812 | } | |
813 | \f | |
814 | /* Set the mode parameters */ | |
815 | static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm) | |
816 | { | |
817 | int set_it = 0; | |
818 | unsigned long arg; | |
819 | char *name = tape_name(STp); | |
820 | ||
821 | if (!STp->density_changed && | |
822 | STm->default_density >= 0 && | |
823 | STm->default_density != STp->density) { | |
824 | arg = STm->default_density; | |
825 | set_it = 1; | |
826 | } else | |
827 | arg = STp->density; | |
828 | arg <<= MT_ST_DENSITY_SHIFT; | |
829 | if (!STp->blksize_changed && | |
830 | STm->default_blksize >= 0 && | |
831 | STm->default_blksize != STp->block_size) { | |
832 | arg |= STm->default_blksize; | |
833 | set_it = 1; | |
834 | } else | |
835 | arg |= STp->block_size; | |
836 | if (set_it && | |
837 | st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) { | |
838 | printk(KERN_WARNING | |
839 | "%s: Can't set default block size to %d bytes and density %x.\n", | |
840 | name, STm->default_blksize, STm->default_density); | |
841 | if (modes_defined) | |
842 | return (-EINVAL); | |
843 | } | |
844 | return 0; | |
845 | } | |
846 | ||
847 | ||
8b05b773 | 848 | /* Lock or unlock the drive door. Don't use when st_request allocated. */ |
1da177e4 LT |
849 | static int do_door_lock(struct scsi_tape * STp, int do_lock) |
850 | { | |
851 | int retval, cmd; | |
852 | DEB(char *name = tape_name(STp);) | |
853 | ||
854 | ||
855 | cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK; | |
856 | DEBC(printk(ST_DEB_MSG "%s: %socking drive door.\n", name, | |
857 | do_lock ? "L" : "Unl")); | |
858 | retval = scsi_ioctl(STp->device, cmd, NULL); | |
859 | if (!retval) { | |
860 | STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; | |
861 | } | |
862 | else { | |
863 | STp->door_locked = ST_LOCK_FAILS; | |
864 | } | |
865 | return retval; | |
866 | } | |
867 | ||
868 | ||
869 | /* Set the internal state after reset */ | |
870 | static void reset_state(struct scsi_tape *STp) | |
871 | { | |
872 | int i; | |
873 | struct st_partstat *STps; | |
874 | ||
875 | STp->pos_unknown = 0; | |
876 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
877 | STps = &(STp->ps[i]); | |
878 | STps->rw = ST_IDLE; | |
879 | STps->eof = ST_NOEOF; | |
880 | STps->at_sm = 0; | |
881 | STps->last_block_valid = 0; | |
882 | STps->drv_block = -1; | |
883 | STps->drv_file = -1; | |
884 | } | |
885 | if (STp->can_partitions) { | |
886 | STp->partition = find_partition(STp); | |
887 | if (STp->partition < 0) | |
888 | STp->partition = 0; | |
889 | STp->new_partition = STp->partition; | |
890 | } | |
891 | } | |
892 | \f | |
893 | /* Test if the drive is ready. Returns either one of the codes below or a negative system | |
894 | error code. */ | |
895 | #define CHKRES_READY 0 | |
896 | #define CHKRES_NEW_SESSION 1 | |
897 | #define CHKRES_NOT_READY 2 | |
898 | #define CHKRES_NO_TAPE 3 | |
899 | ||
900 | #define MAX_ATTENTIONS 10 | |
901 | ||
902 | static int test_ready(struct scsi_tape *STp, int do_wait) | |
903 | { | |
904 | int attentions, waits, max_wait, scode; | |
905 | int retval = CHKRES_READY, new_session = 0; | |
906 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
02ae2c0e | 907 | struct st_request *SRpnt = NULL; |
1da177e4 LT |
908 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; |
909 | ||
910 | max_wait = do_wait ? ST_BLOCK_SECONDS : 0; | |
911 | ||
912 | for (attentions=waits=0; ; ) { | |
913 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
914 | cmd[0] = TEST_UNIT_READY; | |
02ae2c0e KM |
915 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, |
916 | STp->long_timeout, MAX_READY_RETRIES, 1); | |
1da177e4 | 917 | |
02ae2c0e KM |
918 | if (!SRpnt) { |
919 | retval = (STp->buffer)->syscall_result; | |
1da177e4 | 920 | break; |
02ae2c0e | 921 | } |
1da177e4 LT |
922 | |
923 | if (cmdstatp->have_sense) { | |
924 | ||
925 | scode = cmdstatp->sense_hdr.sense_key; | |
926 | ||
927 | if (scode == UNIT_ATTENTION) { /* New media? */ | |
928 | new_session = 1; | |
929 | if (attentions < MAX_ATTENTIONS) { | |
930 | attentions++; | |
931 | continue; | |
932 | } | |
933 | else { | |
934 | retval = (-EIO); | |
935 | break; | |
936 | } | |
937 | } | |
938 | ||
939 | if (scode == NOT_READY) { | |
940 | if (waits < max_wait) { | |
941 | if (msleep_interruptible(1000)) { | |
942 | retval = (-EINTR); | |
943 | break; | |
944 | } | |
945 | waits++; | |
946 | continue; | |
947 | } | |
948 | else { | |
949 | if ((STp->device)->scsi_level >= SCSI_2 && | |
950 | cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */ | |
951 | retval = CHKRES_NO_TAPE; | |
952 | else | |
953 | retval = CHKRES_NOT_READY; | |
954 | break; | |
955 | } | |
956 | } | |
957 | } | |
958 | ||
959 | retval = (STp->buffer)->syscall_result; | |
960 | if (!retval) | |
961 | retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY; | |
962 | break; | |
963 | } | |
964 | ||
02ae2c0e KM |
965 | if (SRpnt != NULL) |
966 | st_release_request(SRpnt); | |
1da177e4 LT |
967 | return retval; |
968 | } | |
969 | ||
970 | ||
971 | /* See if the drive is ready and gather information about the tape. Return values: | |
972 | < 0 negative error code from errno.h | |
973 | 0 drive ready | |
974 | 1 drive not ready (possibly no tape) | |
975 | */ | |
976 | static int check_tape(struct scsi_tape *STp, struct file *filp) | |
977 | { | |
978 | int i, retval, new_session = 0, do_wait; | |
979 | unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning; | |
980 | unsigned short st_flags = filp->f_flags; | |
8b05b773 | 981 | struct st_request *SRpnt = NULL; |
1da177e4 LT |
982 | struct st_modedef *STm; |
983 | struct st_partstat *STps; | |
984 | char *name = tape_name(STp); | |
7ac6207b | 985 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
986 | int mode = TAPE_MODE(inode); |
987 | ||
988 | STp->ready = ST_READY; | |
989 | ||
990 | if (mode != STp->current_mode) { | |
991 | DEBC(printk(ST_DEB_MSG "%s: Mode change from %d to %d.\n", | |
992 | name, STp->current_mode, mode)); | |
993 | new_session = 1; | |
994 | STp->current_mode = mode; | |
995 | } | |
996 | STm = &(STp->modes[STp->current_mode]); | |
997 | ||
998 | saved_cleaning = STp->cleaning_req; | |
999 | STp->cleaning_req = 0; | |
1000 | ||
1001 | do_wait = ((filp->f_flags & O_NONBLOCK) == 0); | |
1002 | retval = test_ready(STp, do_wait); | |
1003 | ||
1004 | if (retval < 0) | |
1005 | goto err_out; | |
1006 | ||
1007 | if (retval == CHKRES_NEW_SESSION) { | |
1008 | STp->pos_unknown = 0; | |
1009 | STp->partition = STp->new_partition = 0; | |
1010 | if (STp->can_partitions) | |
1011 | STp->nbr_partitions = 1; /* This guess will be updated later | |
1012 | if necessary */ | |
1013 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
1014 | STps = &(STp->ps[i]); | |
1015 | STps->rw = ST_IDLE; | |
1016 | STps->eof = ST_NOEOF; | |
1017 | STps->at_sm = 0; | |
1018 | STps->last_block_valid = 0; | |
1019 | STps->drv_block = 0; | |
1020 | STps->drv_file = 0; | |
1021 | } | |
1022 | new_session = 1; | |
1023 | } | |
1024 | else { | |
1025 | STp->cleaning_req |= saved_cleaning; | |
1026 | ||
1027 | if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) { | |
1028 | if (retval == CHKRES_NO_TAPE) | |
1029 | STp->ready = ST_NO_TAPE; | |
1030 | else | |
1031 | STp->ready = ST_NOT_READY; | |
1032 | ||
1033 | STp->density = 0; /* Clear the erroneous "residue" */ | |
1034 | STp->write_prot = 0; | |
1035 | STp->block_size = 0; | |
1036 | STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); | |
1037 | STp->partition = STp->new_partition = 0; | |
1038 | STp->door_locked = ST_UNLOCKED; | |
1039 | return CHKRES_NOT_READY; | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | if (STp->omit_blklims) | |
1044 | STp->min_block = STp->max_block = (-1); | |
1045 | else { | |
1046 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
1047 | cmd[0] = READ_BLOCK_LIMITS; | |
1048 | ||
02ae2c0e KM |
1049 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, |
1050 | STp->device->request_queue->rq_timeout, | |
1051 | MAX_READY_RETRIES, 1); | |
1052 | if (!SRpnt) { | |
1053 | retval = (STp->buffer)->syscall_result; | |
1da177e4 LT |
1054 | goto err_out; |
1055 | } | |
1056 | ||
8b05b773 | 1057 | if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) { |
1da177e4 LT |
1058 | STp->max_block = ((STp->buffer)->b_data[1] << 16) | |
1059 | ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; | |
1060 | STp->min_block = ((STp->buffer)->b_data[4] << 8) | | |
1061 | (STp->buffer)->b_data[5]; | |
1062 | if ( DEB( debugging || ) !STp->inited) | |
42252854 | 1063 | printk(KERN_INFO |
1da177e4 LT |
1064 | "%s: Block limits %d - %d bytes.\n", name, |
1065 | STp->min_block, STp->max_block); | |
1066 | } else { | |
1067 | STp->min_block = STp->max_block = (-1); | |
1068 | DEBC(printk(ST_DEB_MSG "%s: Can't read block limits.\n", | |
1069 | name)); | |
1070 | } | |
1071 | } | |
1072 | ||
1073 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
1074 | cmd[0] = MODE_SENSE; | |
1075 | cmd[4] = 12; | |
1076 | ||
02ae2c0e KM |
1077 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, |
1078 | STp->device->request_queue->rq_timeout, | |
1079 | MAX_READY_RETRIES, 1); | |
1080 | if (!SRpnt) { | |
1081 | retval = (STp->buffer)->syscall_result; | |
1da177e4 LT |
1082 | goto err_out; |
1083 | } | |
1084 | ||
1085 | if ((STp->buffer)->syscall_result != 0) { | |
1086 | DEBC(printk(ST_DEB_MSG "%s: No Mode Sense.\n", name)); | |
1087 | STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ | |
1088 | (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ | |
1089 | STp->drv_write_prot = 0; | |
1090 | } else { | |
1091 | DEBC(printk(ST_DEB_MSG | |
1092 | "%s: Mode sense. Length %d, medium %x, WBS %x, BLL %d\n", | |
1093 | name, | |
1094 | (STp->buffer)->b_data[0], (STp->buffer)->b_data[1], | |
1095 | (STp->buffer)->b_data[2], (STp->buffer)->b_data[3])); | |
1096 | ||
1097 | if ((STp->buffer)->b_data[3] >= 8) { | |
1098 | STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; | |
1099 | STp->density = (STp->buffer)->b_data[4]; | |
1100 | STp->block_size = (STp->buffer)->b_data[9] * 65536 + | |
1101 | (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; | |
1102 | DEBC(printk(ST_DEB_MSG | |
1103 | "%s: Density %x, tape length: %x, drv buffer: %d\n", | |
1104 | name, STp->density, (STp->buffer)->b_data[5] * 65536 + | |
1105 | (STp->buffer)->b_data[6] * 256 + (STp->buffer)->b_data[7], | |
1106 | STp->drv_buffer)); | |
1107 | } | |
1108 | STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; | |
c743e44f LD |
1109 | if (!STp->drv_buffer && STp->immediate_filemark) { |
1110 | printk(KERN_WARNING | |
1111 | "%s: non-buffered tape: disabling writing immediate filemarks\n", | |
1112 | name); | |
1113 | STp->immediate_filemark = 0; | |
1114 | } | |
1da177e4 | 1115 | } |
8b05b773 | 1116 | st_release_request(SRpnt); |
1da177e4 LT |
1117 | SRpnt = NULL; |
1118 | STp->inited = 1; | |
1119 | ||
1120 | if (STp->block_size > 0) | |
1121 | (STp->buffer)->buffer_blocks = | |
1122 | (STp->buffer)->buffer_size / STp->block_size; | |
1123 | else | |
1124 | (STp->buffer)->buffer_blocks = 1; | |
1125 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; | |
1126 | ||
1127 | DEBC(printk(ST_DEB_MSG | |
1128 | "%s: Block size: %d, buffer size: %d (%d blocks).\n", name, | |
1129 | STp->block_size, (STp->buffer)->buffer_size, | |
1130 | (STp->buffer)->buffer_blocks)); | |
1131 | ||
1132 | if (STp->drv_write_prot) { | |
1133 | STp->write_prot = 1; | |
1134 | ||
1135 | DEBC(printk(ST_DEB_MSG "%s: Write protected\n", name)); | |
1136 | ||
1137 | if (do_wait && | |
1138 | ((st_flags & O_ACCMODE) == O_WRONLY || | |
1139 | (st_flags & O_ACCMODE) == O_RDWR)) { | |
1140 | retval = (-EROFS); | |
1141 | goto err_out; | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | if (STp->can_partitions && STp->nbr_partitions < 1) { | |
1146 | /* This code is reached when the device is opened for the first time | |
1147 | after the driver has been initialized with tape in the drive and the | |
1148 | partition support has been enabled. */ | |
1149 | DEBC(printk(ST_DEB_MSG | |
1150 | "%s: Updating partition number in status.\n", name)); | |
1151 | if ((STp->partition = find_partition(STp)) < 0) { | |
1152 | retval = STp->partition; | |
1153 | goto err_out; | |
1154 | } | |
1155 | STp->new_partition = STp->partition; | |
1156 | STp->nbr_partitions = 1; /* This guess will be updated when necessary */ | |
1157 | } | |
1158 | ||
1159 | if (new_session) { /* Change the drive parameters for the new mode */ | |
1160 | STp->density_changed = STp->blksize_changed = 0; | |
1161 | STp->compression_changed = 0; | |
1162 | if (!(STm->defaults_for_writes) && | |
1163 | (retval = set_mode_densblk(STp, STm)) < 0) | |
1164 | goto err_out; | |
1165 | ||
1166 | if (STp->default_drvbuffer != 0xff) { | |
1167 | if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer)) | |
1168 | printk(KERN_WARNING | |
1169 | "%s: Can't set default drive buffering to %d.\n", | |
1170 | name, STp->default_drvbuffer); | |
1171 | } | |
1172 | } | |
1173 | ||
1174 | return CHKRES_READY; | |
1175 | ||
1176 | err_out: | |
1177 | return retval; | |
1178 | } | |
1179 | ||
1180 | ||
b3369c68 | 1181 | \f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host |
1da177e4 LT |
1182 | module count. */ |
1183 | static int st_open(struct inode *inode, struct file *filp) | |
1184 | { | |
1185 | int i, retval = (-EIO); | |
46a243f7 | 1186 | int resumed = 0; |
1da177e4 LT |
1187 | struct scsi_tape *STp; |
1188 | struct st_partstat *STps; | |
1189 | int dev = TAPE_NR(inode); | |
1190 | char *name; | |
1191 | ||
2a48fc0a | 1192 | mutex_lock(&st_mutex); |
1da177e4 LT |
1193 | /* |
1194 | * We really want to do nonseekable_open(inode, filp); here, but some | |
1195 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
1196 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
1197 | */ | |
1198 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
1199 | ||
b3369c68 | 1200 | if (!(STp = scsi_tape_get(dev))) { |
2a48fc0a | 1201 | mutex_unlock(&st_mutex); |
f03a5670 | 1202 | return -ENXIO; |
b3369c68 | 1203 | } |
f03a5670 | 1204 | |
1da177e4 | 1205 | write_lock(&st_dev_arr_lock); |
1da177e4 LT |
1206 | filp->private_data = STp; |
1207 | name = tape_name(STp); | |
1208 | ||
1209 | if (STp->in_use) { | |
1210 | write_unlock(&st_dev_arr_lock); | |
f03a5670 | 1211 | scsi_tape_put(STp); |
2a48fc0a | 1212 | mutex_unlock(&st_mutex); |
1da177e4 LT |
1213 | DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); ) |
1214 | return (-EBUSY); | |
1215 | } | |
1216 | ||
1da177e4 LT |
1217 | STp->in_use = 1; |
1218 | write_unlock(&st_dev_arr_lock); | |
1219 | STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; | |
1220 | ||
46a243f7 ON |
1221 | if (scsi_autopm_get_device(STp->device) < 0) { |
1222 | retval = -EIO; | |
1223 | goto err_out; | |
1224 | } | |
1225 | resumed = 1; | |
1da177e4 LT |
1226 | if (!scsi_block_when_processing_errors(STp->device)) { |
1227 | retval = (-ENXIO); | |
1228 | goto err_out; | |
1229 | } | |
1230 | ||
1231 | /* See that we have at least a one page buffer available */ | |
1232 | if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) { | |
1233 | printk(KERN_WARNING "%s: Can't allocate one page tape buffer.\n", | |
1234 | name); | |
1235 | retval = (-EOVERFLOW); | |
1236 | goto err_out; | |
1237 | } | |
1238 | ||
40f6b36c | 1239 | (STp->buffer)->cleared = 0; |
1da177e4 LT |
1240 | (STp->buffer)->writing = 0; |
1241 | (STp->buffer)->syscall_result = 0; | |
1242 | ||
1243 | STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY); | |
1244 | ||
1245 | STp->dirty = 0; | |
1246 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
1247 | STps = &(STp->ps[i]); | |
1248 | STps->rw = ST_IDLE; | |
1249 | } | |
9abe16c6 | 1250 | STp->try_dio_now = STp->try_dio; |
1da177e4 LT |
1251 | STp->recover_count = 0; |
1252 | DEB( STp->nbr_waits = STp->nbr_finished = 0; | |
deee13df | 1253 | STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; ) |
1da177e4 LT |
1254 | |
1255 | retval = check_tape(STp, filp); | |
1256 | if (retval < 0) | |
1257 | goto err_out; | |
1258 | if ((filp->f_flags & O_NONBLOCK) == 0 && | |
1259 | retval != CHKRES_READY) { | |
413f7327 KM |
1260 | if (STp->ready == NO_TAPE) |
1261 | retval = (-ENOMEDIUM); | |
1262 | else | |
1263 | retval = (-EIO); | |
1da177e4 LT |
1264 | goto err_out; |
1265 | } | |
2a48fc0a | 1266 | mutex_unlock(&st_mutex); |
1da177e4 LT |
1267 | return 0; |
1268 | ||
1269 | err_out: | |
1270 | normalize_buffer(STp->buffer); | |
1271 | STp->in_use = 0; | |
f03a5670 | 1272 | scsi_tape_put(STp); |
46a243f7 ON |
1273 | if (resumed) |
1274 | scsi_autopm_put_device(STp->device); | |
2a48fc0a | 1275 | mutex_unlock(&st_mutex); |
1da177e4 LT |
1276 | return retval; |
1277 | ||
1278 | } | |
1279 | \f | |
1280 | ||
1281 | /* Flush the tape buffer before close */ | |
75e1fcc0 | 1282 | static int st_flush(struct file *filp, fl_owner_t id) |
1da177e4 LT |
1283 | { |
1284 | int result = 0, result2; | |
1285 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 1286 | struct st_request *SRpnt; |
1da177e4 LT |
1287 | struct scsi_tape *STp = filp->private_data; |
1288 | struct st_modedef *STm = &(STp->modes[STp->current_mode]); | |
1289 | struct st_partstat *STps = &(STp->ps[STp->partition]); | |
1290 | char *name = tape_name(STp); | |
1291 | ||
1292 | if (file_count(filp) > 1) | |
1293 | return 0; | |
1294 | ||
1295 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { | |
8ef8d594 | 1296 | result = st_flush_write_buffer(STp); |
1da177e4 LT |
1297 | if (result != 0 && result != (-ENOSPC)) |
1298 | goto out; | |
1299 | } | |
1300 | ||
1301 | if (STp->can_partitions && | |
1302 | (result2 = switch_partition(STp)) < 0) { | |
1303 | DEBC(printk(ST_DEB_MSG | |
1304 | "%s: switch_partition at close failed.\n", name)); | |
1305 | if (result == 0) | |
1306 | result = result2; | |
1307 | goto out; | |
1308 | } | |
1309 | ||
1310 | DEBC( if (STp->nbr_requests) | |
deee13df KM |
1311 | printk(KERN_DEBUG "%s: Number of r/w requests %d, dio used in %d, pages %d.\n", |
1312 | name, STp->nbr_requests, STp->nbr_dio, STp->nbr_pages)); | |
1da177e4 LT |
1313 | |
1314 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { | |
1315 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1316 | ||
1317 | DEBC(printk(ST_DEB_MSG "%s: Async write waits %d, finished %d.\n", | |
1318 | name, STp->nbr_waits, STp->nbr_finished); | |
1319 | ) | |
1320 | ||
1321 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1322 | cmd[0] = WRITE_FILEMARKS; | |
c743e44f LD |
1323 | if (STp->immediate_filemark) |
1324 | cmd[1] = 1; | |
1da177e4 LT |
1325 | cmd[4] = 1 + STp->two_fm; |
1326 | ||
02ae2c0e KM |
1327 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
1328 | STp->device->request_queue->rq_timeout, | |
1329 | MAX_WRITE_RETRIES, 1); | |
1da177e4 | 1330 | if (!SRpnt) { |
02ae2c0e | 1331 | result = (STp->buffer)->syscall_result; |
1da177e4 LT |
1332 | goto out; |
1333 | } | |
1334 | ||
1335 | if (STp->buffer->syscall_result == 0 || | |
1336 | (cmdstatp->have_sense && !cmdstatp->deferred && | |
1337 | (cmdstatp->flags & SENSE_EOM) && | |
1338 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
1339 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && | |
1340 | (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) { | |
1341 | /* Write successful at EOM */ | |
8b05b773 | 1342 | st_release_request(SRpnt); |
1da177e4 LT |
1343 | SRpnt = NULL; |
1344 | if (STps->drv_file >= 0) | |
1345 | STps->drv_file++; | |
1346 | STps->drv_block = 0; | |
1347 | if (STp->two_fm) | |
1348 | cross_eof(STp, 0); | |
1349 | STps->eof = ST_FM; | |
1350 | } | |
1351 | else { /* Write error */ | |
8b05b773 | 1352 | st_release_request(SRpnt); |
1da177e4 LT |
1353 | SRpnt = NULL; |
1354 | printk(KERN_ERR "%s: Error on write filemark.\n", name); | |
1355 | if (result == 0) | |
1356 | result = (-EIO); | |
1357 | } | |
1358 | ||
1359 | DEBC(printk(ST_DEB_MSG "%s: Buffer flushed, %d EOF(s) written\n", | |
1360 | name, cmd[4])); | |
1361 | } else if (!STp->rew_at_close) { | |
1362 | STps = &(STp->ps[STp->partition]); | |
1363 | if (!STm->sysv || STps->rw != ST_READING) { | |
1364 | if (STp->can_bsr) | |
1365 | result = flush_buffer(STp, 0); | |
1366 | else if (STps->eof == ST_FM_HIT) { | |
1367 | result = cross_eof(STp, 0); | |
1368 | if (result) { | |
1369 | if (STps->drv_file >= 0) | |
1370 | STps->drv_file++; | |
1371 | STps->drv_block = 0; | |
1372 | STps->eof = ST_FM; | |
1373 | } else | |
1374 | STps->eof = ST_NOEOF; | |
1375 | } | |
1376 | } else if ((STps->eof == ST_NOEOF && | |
1377 | !(result = cross_eof(STp, 1))) || | |
1378 | STps->eof == ST_FM_HIT) { | |
1379 | if (STps->drv_file >= 0) | |
1380 | STps->drv_file++; | |
1381 | STps->drv_block = 0; | |
1382 | STps->eof = ST_FM; | |
1383 | } | |
1384 | } | |
1385 | ||
1386 | out: | |
1387 | if (STp->rew_at_close) { | |
1388 | result2 = st_int_ioctl(STp, MTREW, 1); | |
1389 | if (result == 0) | |
1390 | result = result2; | |
1391 | } | |
1392 | return result; | |
1393 | } | |
1394 | ||
1395 | ||
1396 | /* Close the device and release it. BKL is not needed: this is the only thread | |
1397 | accessing this tape. */ | |
1398 | static int st_release(struct inode *inode, struct file *filp) | |
1399 | { | |
1400 | int result = 0; | |
1401 | struct scsi_tape *STp = filp->private_data; | |
1402 | ||
1403 | if (STp->door_locked == ST_LOCKED_AUTO) | |
1404 | do_door_lock(STp, 0); | |
1405 | ||
1406 | normalize_buffer(STp->buffer); | |
1407 | write_lock(&st_dev_arr_lock); | |
1408 | STp->in_use = 0; | |
1409 | write_unlock(&st_dev_arr_lock); | |
46a243f7 | 1410 | scsi_autopm_put_device(STp->device); |
f03a5670 | 1411 | scsi_tape_put(STp); |
1da177e4 LT |
1412 | |
1413 | return result; | |
1414 | } | |
1415 | \f | |
1416 | /* The checks common to both reading and writing */ | |
1417 | static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count) | |
1418 | { | |
1419 | ssize_t retval = 0; | |
1420 | ||
1421 | /* | |
1422 | * If we are in the middle of error recovery, don't let anyone | |
1423 | * else try and use this device. Also, if error recovery fails, it | |
1424 | * may try and take the device offline, in which case all further | |
1425 | * access to the device is prohibited. | |
1426 | */ | |
1427 | if (!scsi_block_when_processing_errors(STp->device)) { | |
1428 | retval = (-ENXIO); | |
1429 | goto out; | |
1430 | } | |
1431 | ||
1432 | if (STp->ready != ST_READY) { | |
1433 | if (STp->ready == ST_NO_TAPE) | |
1434 | retval = (-ENOMEDIUM); | |
1435 | else | |
1436 | retval = (-EIO); | |
1437 | goto out; | |
1438 | } | |
1439 | ||
1440 | if (! STp->modes[STp->current_mode].defined) { | |
1441 | retval = (-ENXIO); | |
1442 | goto out; | |
1443 | } | |
1444 | ||
1445 | ||
1446 | /* | |
1447 | * If there was a bus reset, block further access | |
1448 | * to this device. | |
1449 | */ | |
1450 | if (STp->pos_unknown) { | |
1451 | retval = (-EIO); | |
1452 | goto out; | |
1453 | } | |
1454 | ||
1455 | if (count == 0) | |
1456 | goto out; | |
1457 | ||
1458 | DEB( | |
1459 | if (!STp->in_use) { | |
1460 | printk(ST_DEB_MSG "%s: Incorrect device.\n", tape_name(STp)); | |
1461 | retval = (-EIO); | |
1462 | goto out; | |
1463 | } ) /* end DEB */ | |
1464 | ||
1465 | if (STp->can_partitions && | |
1466 | (retval = switch_partition(STp)) < 0) | |
1467 | goto out; | |
1468 | ||
1469 | if (STp->block_size == 0 && STp->max_block > 0 && | |
1470 | (count < STp->min_block || count > STp->max_block)) { | |
1471 | retval = (-EINVAL); | |
1472 | goto out; | |
1473 | } | |
1474 | ||
1475 | if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && | |
1476 | !do_door_lock(STp, 1)) | |
1477 | STp->door_locked = ST_LOCKED_AUTO; | |
1478 | ||
1479 | out: | |
1480 | return retval; | |
1481 | } | |
1482 | ||
1483 | ||
1484 | static int setup_buffering(struct scsi_tape *STp, const char __user *buf, | |
1485 | size_t count, int is_read) | |
1486 | { | |
1487 | int i, bufsize, retval = 0; | |
1488 | struct st_buffer *STbp = STp->buffer; | |
1489 | ||
1490 | if (is_read) | |
9abe16c6 | 1491 | i = STp->try_dio_now && try_rdio; |
1da177e4 | 1492 | else |
9abe16c6 | 1493 | i = STp->try_dio_now && try_wdio; |
8b05b773 | 1494 | |
1da177e4 LT |
1495 | if (i && ((unsigned long)buf & queue_dma_alignment( |
1496 | STp->device->request_queue)) == 0) { | |
6620742f FT |
1497 | i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf, |
1498 | count, (is_read ? READ : WRITE)); | |
1da177e4 LT |
1499 | if (i > 0) { |
1500 | STbp->do_dio = i; | |
1501 | STbp->buffer_bytes = 0; /* can be used as transfer counter */ | |
1502 | } | |
1503 | else | |
1504 | STbp->do_dio = 0; /* fall back to buffering with any error */ | |
1505 | STbp->sg_segs = STbp->do_dio; | |
1da177e4 LT |
1506 | DEB( |
1507 | if (STbp->do_dio) { | |
1508 | STp->nbr_dio++; | |
1509 | STp->nbr_pages += STbp->do_dio; | |
1da177e4 LT |
1510 | } |
1511 | ) | |
1512 | } else | |
1513 | STbp->do_dio = 0; | |
1514 | DEB( STp->nbr_requests++; ) | |
1515 | ||
1516 | if (!STbp->do_dio) { | |
1517 | if (STp->block_size) | |
1518 | bufsize = STp->block_size > st_fixed_buffer_size ? | |
1519 | STp->block_size : st_fixed_buffer_size; | |
40f6b36c | 1520 | else { |
1da177e4 | 1521 | bufsize = count; |
40f6b36c KM |
1522 | /* Make sure that data from previous user is not leaked even if |
1523 | HBA does not return correct residual */ | |
1524 | if (is_read && STp->sili && !STbp->cleared) | |
1525 | clear_buffer(STbp); | |
1526 | } | |
1527 | ||
1da177e4 LT |
1528 | if (bufsize > STbp->buffer_size && |
1529 | !enlarge_buffer(STbp, bufsize, STp->restr_dma)) { | |
1530 | printk(KERN_WARNING "%s: Can't allocate %d byte tape buffer.\n", | |
1531 | tape_name(STp), bufsize); | |
1532 | retval = (-EOVERFLOW); | |
1533 | goto out; | |
1534 | } | |
1535 | if (STp->block_size) | |
1536 | STbp->buffer_blocks = bufsize / STp->block_size; | |
1537 | } | |
1538 | ||
1539 | out: | |
1540 | return retval; | |
1541 | } | |
1542 | ||
1543 | ||
1544 | /* Can be called more than once after each setup_buffer() */ | |
787926b1 | 1545 | static void release_buffering(struct scsi_tape *STp, int is_read) |
1da177e4 LT |
1546 | { |
1547 | struct st_buffer *STbp; | |
1548 | ||
1549 | STbp = STp->buffer; | |
1550 | if (STbp->do_dio) { | |
6620742f | 1551 | sgl_unmap_user_pages(STbp, STbp->do_dio, is_read); |
1da177e4 | 1552 | STbp->do_dio = 0; |
787926b1 | 1553 | STbp->sg_segs = 0; |
1da177e4 LT |
1554 | } |
1555 | } | |
1556 | ||
1557 | ||
1558 | /* Write command */ | |
1559 | static ssize_t | |
1560 | st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
1561 | { | |
1562 | ssize_t total; | |
1563 | ssize_t i, do_count, blks, transfer; | |
1564 | ssize_t retval; | |
1565 | int undone, retry_eot = 0, scode; | |
1566 | int async_write; | |
1567 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
1568 | const char __user *b_point; | |
8b05b773 | 1569 | struct st_request *SRpnt = NULL; |
1da177e4 LT |
1570 | struct scsi_tape *STp = filp->private_data; |
1571 | struct st_modedef *STm; | |
1572 | struct st_partstat *STps; | |
1573 | struct st_buffer *STbp; | |
1574 | char *name = tape_name(STp); | |
1575 | ||
28f85009 | 1576 | if (mutex_lock_interruptible(&STp->lock)) |
1da177e4 LT |
1577 | return -ERESTARTSYS; |
1578 | ||
1579 | retval = rw_checks(STp, filp, count); | |
1580 | if (retval || count == 0) | |
1581 | goto out; | |
1582 | ||
1583 | /* Write must be integral number of blocks */ | |
1584 | if (STp->block_size != 0 && (count % STp->block_size) != 0) { | |
1585 | printk(KERN_WARNING "%s: Write not multiple of tape block size.\n", | |
1586 | name); | |
1587 | retval = (-EINVAL); | |
1588 | goto out; | |
1589 | } | |
1590 | ||
1591 | STm = &(STp->modes[STp->current_mode]); | |
1592 | STps = &(STp->ps[STp->partition]); | |
1593 | ||
1594 | if (STp->write_prot) { | |
1595 | retval = (-EACCES); | |
1596 | goto out; | |
1597 | } | |
1598 | ||
1599 | ||
1600 | if (STps->rw == ST_READING) { | |
1601 | retval = flush_buffer(STp, 0); | |
1602 | if (retval) | |
1603 | goto out; | |
1604 | STps->rw = ST_WRITING; | |
1605 | } else if (STps->rw != ST_WRITING && | |
1606 | STps->drv_file == 0 && STps->drv_block == 0) { | |
1607 | if ((retval = set_mode_densblk(STp, STm)) < 0) | |
1608 | goto out; | |
1609 | if (STm->default_compression != ST_DONT_TOUCH && | |
1610 | !(STp->compression_changed)) { | |
1611 | if (st_compression(STp, (STm->default_compression == ST_YES))) { | |
1612 | printk(KERN_WARNING "%s: Can't set default compression.\n", | |
1613 | name); | |
1614 | if (modes_defined) { | |
1615 | retval = (-EINVAL); | |
1616 | goto out; | |
1617 | } | |
1618 | } | |
1619 | } | |
1620 | } | |
1621 | ||
1622 | STbp = STp->buffer; | |
1623 | i = write_behind_check(STp); | |
1624 | if (i) { | |
1625 | if (i == -ENOSPC) | |
1626 | STps->eof = ST_EOM_OK; | |
1627 | else | |
1628 | STps->eof = ST_EOM_ERROR; | |
1629 | } | |
1630 | ||
1631 | if (STps->eof == ST_EOM_OK) { | |
1632 | STps->eof = ST_EOD_1; /* allow next write */ | |
1633 | retval = (-ENOSPC); | |
1634 | goto out; | |
1635 | } | |
1636 | else if (STps->eof == ST_EOM_ERROR) { | |
1637 | retval = (-EIO); | |
1638 | goto out; | |
1639 | } | |
1640 | ||
1641 | /* Check the buffer readability in cases where copy_user might catch | |
1642 | the problems after some tape movement. */ | |
1643 | if (STp->block_size != 0 && | |
1644 | !STbp->do_dio && | |
1645 | (copy_from_user(&i, buf, 1) != 0 || | |
1646 | copy_from_user(&i, buf + count - 1, 1) != 0)) { | |
1647 | retval = (-EFAULT); | |
1648 | goto out; | |
1649 | } | |
1650 | ||
1651 | retval = setup_buffering(STp, buf, count, 0); | |
1652 | if (retval) | |
1653 | goto out; | |
1654 | ||
1655 | total = count; | |
1656 | ||
1657 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1658 | cmd[0] = WRITE_6; | |
1659 | cmd[1] = (STp->block_size != 0); | |
1660 | ||
1661 | STps->rw = ST_WRITING; | |
1662 | ||
1663 | b_point = buf; | |
1664 | while (count > 0 && !retry_eot) { | |
1665 | ||
1666 | if (STbp->do_dio) { | |
1667 | do_count = count; | |
1668 | } | |
1669 | else { | |
1670 | if (STp->block_size == 0) | |
1671 | do_count = count; | |
1672 | else { | |
1673 | do_count = STbp->buffer_blocks * STp->block_size - | |
1674 | STbp->buffer_bytes; | |
1675 | if (do_count > count) | |
1676 | do_count = count; | |
1677 | } | |
1678 | ||
1679 | i = append_to_buffer(b_point, STbp, do_count); | |
1680 | if (i) { | |
1681 | retval = i; | |
1682 | goto out; | |
1683 | } | |
1684 | } | |
1685 | count -= do_count; | |
1686 | b_point += do_count; | |
1687 | ||
1688 | async_write = STp->block_size == 0 && !STbp->do_dio && | |
1689 | STm->do_async_writes && STps->eof < ST_EOM_OK; | |
1690 | ||
1691 | if (STp->block_size != 0 && STm->do_buffer_writes && | |
9abe16c6 | 1692 | !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK && |
1da177e4 LT |
1693 | STbp->buffer_bytes < STbp->buffer_size) { |
1694 | STp->dirty = 1; | |
1695 | /* Don't write a buffer that is not full enough. */ | |
1696 | if (!async_write && count == 0) | |
1697 | break; | |
1698 | } | |
1699 | ||
1700 | retry_write: | |
1701 | if (STp->block_size == 0) | |
1702 | blks = transfer = do_count; | |
1703 | else { | |
1704 | if (!STbp->do_dio) | |
1705 | blks = STbp->buffer_bytes; | |
1706 | else | |
1707 | blks = do_count; | |
1708 | blks /= STp->block_size; | |
1709 | transfer = blks * STp->block_size; | |
1710 | } | |
1711 | cmd[2] = blks >> 16; | |
1712 | cmd[3] = blks >> 8; | |
1713 | cmd[4] = blks; | |
1714 | ||
1715 | SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE, | |
a02488ed JB |
1716 | STp->device->request_queue->rq_timeout, |
1717 | MAX_WRITE_RETRIES, !async_write); | |
1da177e4 LT |
1718 | if (!SRpnt) { |
1719 | retval = STbp->syscall_result; | |
1720 | goto out; | |
1721 | } | |
8b05b773 | 1722 | if (async_write && !STbp->syscall_result) { |
1da177e4 LT |
1723 | STbp->writing = transfer; |
1724 | STp->dirty = !(STbp->writing == | |
1725 | STbp->buffer_bytes); | |
1726 | SRpnt = NULL; /* Prevent releasing this request! */ | |
1727 | DEB( STp->write_pending = 1; ) | |
1728 | break; | |
1729 | } | |
1730 | ||
1731 | if (STbp->syscall_result != 0) { | |
1732 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1733 | ||
1734 | DEBC(printk(ST_DEB_MSG "%s: Error on write:\n", name)); | |
1735 | if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) { | |
1736 | scode = cmdstatp->sense_hdr.sense_key; | |
1737 | if (cmdstatp->remainder_valid) | |
1738 | undone = (int)cmdstatp->uremainder64; | |
1739 | else if (STp->block_size == 0 && | |
1740 | scode == VOLUME_OVERFLOW) | |
1741 | undone = transfer; | |
1742 | else | |
1743 | undone = 0; | |
1744 | if (STp->block_size != 0) | |
1745 | undone *= STp->block_size; | |
1746 | if (undone <= do_count) { | |
1747 | /* Only data from this write is not written */ | |
1748 | count += undone; | |
626dcb1e | 1749 | b_point -= undone; |
1da177e4 LT |
1750 | do_count -= undone; |
1751 | if (STp->block_size) | |
1752 | blks = (transfer - undone) / STp->block_size; | |
1753 | STps->eof = ST_EOM_OK; | |
1754 | /* Continue in fixed block mode if all written | |
1755 | in this request but still something left to write | |
1756 | (retval left to zero) | |
1757 | */ | |
1758 | if (STp->block_size == 0 || | |
1759 | undone > 0 || count == 0) | |
1760 | retval = (-ENOSPC); /* EOM within current request */ | |
1761 | DEBC(printk(ST_DEB_MSG | |
1762 | "%s: EOM with %d bytes unwritten.\n", | |
1763 | name, (int)count)); | |
1764 | } else { | |
1765 | /* EOT within data buffered earlier (possible only | |
1766 | in fixed block mode without direct i/o) */ | |
1767 | if (!retry_eot && !cmdstatp->deferred && | |
1768 | (scode == NO_SENSE || scode == RECOVERED_ERROR)) { | |
1769 | move_buffer_data(STp->buffer, transfer - undone); | |
1770 | retry_eot = 1; | |
1771 | if (STps->drv_block >= 0) { | |
1772 | STps->drv_block += (transfer - undone) / | |
1773 | STp->block_size; | |
1774 | } | |
1775 | STps->eof = ST_EOM_OK; | |
1776 | DEBC(printk(ST_DEB_MSG | |
1777 | "%s: Retry write of %d bytes at EOM.\n", | |
1778 | name, STp->buffer->buffer_bytes)); | |
1779 | goto retry_write; | |
1780 | } | |
1781 | else { | |
1782 | /* Either error within data buffered by driver or | |
1783 | failed retry */ | |
1784 | count -= do_count; | |
1785 | blks = do_count = 0; | |
1786 | STps->eof = ST_EOM_ERROR; | |
1787 | STps->drv_block = (-1); /* Too cautious? */ | |
1788 | retval = (-EIO); /* EOM for old data */ | |
1789 | DEBC(printk(ST_DEB_MSG | |
1790 | "%s: EOM with lost data.\n", | |
1791 | name)); | |
1792 | } | |
1793 | } | |
1794 | } else { | |
1795 | count += do_count; | |
1796 | STps->drv_block = (-1); /* Too cautious? */ | |
8b05b773 | 1797 | retval = STbp->syscall_result; |
1da177e4 LT |
1798 | } |
1799 | ||
1800 | } | |
1801 | ||
1802 | if (STps->drv_block >= 0) { | |
1803 | if (STp->block_size == 0) | |
1804 | STps->drv_block += (do_count > 0); | |
1805 | else | |
1806 | STps->drv_block += blks; | |
1807 | } | |
1808 | ||
1809 | STbp->buffer_bytes = 0; | |
1810 | STp->dirty = 0; | |
1811 | ||
1812 | if (retval || retry_eot) { | |
1813 | if (count < total) | |
1814 | retval = total - count; | |
1815 | goto out; | |
1816 | } | |
1817 | } | |
1818 | ||
1819 | if (STps->eof == ST_EOD_1) | |
1820 | STps->eof = ST_EOM_OK; | |
1821 | else if (STps->eof != ST_EOM_OK) | |
1822 | STps->eof = ST_NOEOF; | |
1823 | retval = total - count; | |
1824 | ||
1825 | out: | |
1826 | if (SRpnt != NULL) | |
8b05b773 | 1827 | st_release_request(SRpnt); |
787926b1 | 1828 | release_buffering(STp, 0); |
28f85009 | 1829 | mutex_unlock(&STp->lock); |
1da177e4 LT |
1830 | |
1831 | return retval; | |
1832 | } | |
1833 | \f | |
1834 | /* Read data from the tape. Returns zero in the normal case, one if the | |
1835 | eof status has changed, and the negative error code in case of a | |
1836 | fatal error. Otherwise updates the buffer and the eof state. | |
1837 | ||
1838 | Does release user buffer mapping if it is set. | |
1839 | */ | |
1840 | static long read_tape(struct scsi_tape *STp, long count, | |
8b05b773 | 1841 | struct st_request ** aSRpnt) |
1da177e4 LT |
1842 | { |
1843 | int transfer, blks, bytes; | |
1844 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 1845 | struct st_request *SRpnt; |
1da177e4 LT |
1846 | struct st_modedef *STm; |
1847 | struct st_partstat *STps; | |
1848 | struct st_buffer *STbp; | |
1849 | int retval = 0; | |
1850 | char *name = tape_name(STp); | |
1851 | ||
1852 | if (count == 0) | |
1853 | return 0; | |
1854 | ||
1855 | STm = &(STp->modes[STp->current_mode]); | |
1856 | STps = &(STp->ps[STp->partition]); | |
1857 | if (STps->eof == ST_FM_HIT) | |
1858 | return 1; | |
1859 | STbp = STp->buffer; | |
1860 | ||
1861 | if (STp->block_size == 0) | |
1862 | blks = bytes = count; | |
1863 | else { | |
9abe16c6 | 1864 | if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) { |
1da177e4 LT |
1865 | blks = (STp->buffer)->buffer_blocks; |
1866 | bytes = blks * STp->block_size; | |
1867 | } else { | |
1868 | bytes = count; | |
1869 | if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size) | |
1870 | bytes = (STp->buffer)->buffer_size; | |
1871 | blks = bytes / STp->block_size; | |
1872 | bytes = blks * STp->block_size; | |
1873 | } | |
1874 | } | |
1875 | ||
1876 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1877 | cmd[0] = READ_6; | |
1878 | cmd[1] = (STp->block_size != 0); | |
40f6b36c KM |
1879 | if (!cmd[1] && STp->sili) |
1880 | cmd[1] |= 2; | |
1da177e4 LT |
1881 | cmd[2] = blks >> 16; |
1882 | cmd[3] = blks >> 8; | |
1883 | cmd[4] = blks; | |
1884 | ||
1885 | SRpnt = *aSRpnt; | |
1886 | SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE, | |
a02488ed JB |
1887 | STp->device->request_queue->rq_timeout, |
1888 | MAX_RETRIES, 1); | |
787926b1 | 1889 | release_buffering(STp, 1); |
1da177e4 LT |
1890 | *aSRpnt = SRpnt; |
1891 | if (!SRpnt) | |
1892 | return STbp->syscall_result; | |
1893 | ||
1894 | STbp->read_pointer = 0; | |
1895 | STps->at_sm = 0; | |
1896 | ||
1897 | /* Something to check */ | |
1898 | if (STbp->syscall_result) { | |
1899 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1900 | ||
1901 | retval = 1; | |
1902 | DEBC(printk(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", | |
1903 | name, | |
8b05b773 MC |
1904 | SRpnt->sense[0], SRpnt->sense[1], |
1905 | SRpnt->sense[2], SRpnt->sense[3], | |
1906 | SRpnt->sense[4], SRpnt->sense[5], | |
1907 | SRpnt->sense[6], SRpnt->sense[7])); | |
1da177e4 LT |
1908 | if (cmdstatp->have_sense) { |
1909 | ||
1910 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) | |
1911 | cmdstatp->flags &= 0xcf; /* No need for EOM in this case */ | |
1912 | ||
1913 | if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */ | |
1914 | /* Compute the residual count */ | |
1915 | if (cmdstatp->remainder_valid) | |
1916 | transfer = (int)cmdstatp->uremainder64; | |
1917 | else | |
1918 | transfer = 0; | |
1919 | if (STp->block_size == 0 && | |
1920 | cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) | |
1921 | transfer = bytes; | |
1922 | ||
1923 | if (cmdstatp->flags & SENSE_ILI) { /* ILI */ | |
1924 | if (STp->block_size == 0) { | |
1925 | if (transfer <= 0) { | |
1926 | if (transfer < 0) | |
1927 | printk(KERN_NOTICE | |
1928 | "%s: Failed to read %d byte block with %d byte transfer.\n", | |
1929 | name, bytes - transfer, bytes); | |
1930 | if (STps->drv_block >= 0) | |
1931 | STps->drv_block += 1; | |
1932 | STbp->buffer_bytes = 0; | |
1933 | return (-ENOMEM); | |
1934 | } | |
1935 | STbp->buffer_bytes = bytes - transfer; | |
1936 | } else { | |
8b05b773 | 1937 | st_release_request(SRpnt); |
1da177e4 LT |
1938 | SRpnt = *aSRpnt = NULL; |
1939 | if (transfer == blks) { /* We did not get anything, error */ | |
1940 | printk(KERN_NOTICE "%s: Incorrect block size.\n", name); | |
1941 | if (STps->drv_block >= 0) | |
1942 | STps->drv_block += blks - transfer + 1; | |
1943 | st_int_ioctl(STp, MTBSR, 1); | |
1944 | return (-EIO); | |
1945 | } | |
1946 | /* We have some data, deliver it */ | |
1947 | STbp->buffer_bytes = (blks - transfer) * | |
1948 | STp->block_size; | |
1949 | DEBC(printk(ST_DEB_MSG | |
1950 | "%s: ILI but enough data received %ld %d.\n", | |
1951 | name, count, STbp->buffer_bytes)); | |
1952 | if (STps->drv_block >= 0) | |
1953 | STps->drv_block += 1; | |
1954 | if (st_int_ioctl(STp, MTBSR, 1)) | |
1955 | return (-EIO); | |
1956 | } | |
1957 | } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */ | |
1958 | if (STps->eof != ST_FM_HIT) | |
1959 | STps->eof = ST_FM_HIT; | |
1960 | else | |
1961 | STps->eof = ST_EOD_2; | |
1962 | if (STp->block_size == 0) | |
1963 | STbp->buffer_bytes = 0; | |
1964 | else | |
1965 | STbp->buffer_bytes = | |
1966 | bytes - transfer * STp->block_size; | |
1967 | DEBC(printk(ST_DEB_MSG | |
1968 | "%s: EOF detected (%d bytes read).\n", | |
1969 | name, STbp->buffer_bytes)); | |
1970 | } else if (cmdstatp->flags & SENSE_EOM) { | |
1971 | if (STps->eof == ST_FM) | |
1972 | STps->eof = ST_EOD_1; | |
1973 | else | |
1974 | STps->eof = ST_EOM_OK; | |
1975 | if (STp->block_size == 0) | |
1976 | STbp->buffer_bytes = bytes - transfer; | |
1977 | else | |
1978 | STbp->buffer_bytes = | |
1979 | bytes - transfer * STp->block_size; | |
1980 | ||
1981 | DEBC(printk(ST_DEB_MSG "%s: EOM detected (%d bytes read).\n", | |
1982 | name, STbp->buffer_bytes)); | |
1983 | } | |
1984 | } | |
1985 | /* end of EOF, EOM, ILI test */ | |
1986 | else { /* nonzero sense key */ | |
1987 | DEBC(printk(ST_DEB_MSG | |
1988 | "%s: Tape error while reading.\n", name)); | |
1989 | STps->drv_block = (-1); | |
1990 | if (STps->eof == ST_FM && | |
1991 | cmdstatp->sense_hdr.sense_key == BLANK_CHECK) { | |
1992 | DEBC(printk(ST_DEB_MSG | |
1993 | "%s: Zero returned for first BLANK CHECK after EOF.\n", | |
1994 | name)); | |
1995 | STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */ | |
1996 | } else /* Some other extended sense code */ | |
1997 | retval = (-EIO); | |
1998 | } | |
1999 | ||
2000 | if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */ | |
2001 | STbp->buffer_bytes = 0; | |
2002 | } | |
2003 | /* End of extended sense test */ | |
2004 | else { /* Non-extended sense */ | |
2005 | retval = STbp->syscall_result; | |
2006 | } | |
2007 | ||
2008 | } | |
2009 | /* End of error handling */ | |
40f6b36c | 2010 | else { /* Read successful */ |
1da177e4 | 2011 | STbp->buffer_bytes = bytes; |
40f6b36c KM |
2012 | if (STp->sili) /* In fixed block mode residual is always zero here */ |
2013 | STbp->buffer_bytes -= STp->buffer->cmdstat.residual; | |
2014 | } | |
1da177e4 LT |
2015 | |
2016 | if (STps->drv_block >= 0) { | |
2017 | if (STp->block_size == 0) | |
2018 | STps->drv_block++; | |
2019 | else | |
2020 | STps->drv_block += STbp->buffer_bytes / STp->block_size; | |
2021 | } | |
2022 | return retval; | |
2023 | } | |
2024 | \f | |
2025 | ||
2026 | /* Read command */ | |
2027 | static ssize_t | |
2028 | st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
2029 | { | |
2030 | ssize_t total; | |
2031 | ssize_t retval = 0; | |
2032 | ssize_t i, transfer; | |
2033 | int special, do_dio = 0; | |
8b05b773 | 2034 | struct st_request *SRpnt = NULL; |
1da177e4 LT |
2035 | struct scsi_tape *STp = filp->private_data; |
2036 | struct st_modedef *STm; | |
2037 | struct st_partstat *STps; | |
2038 | struct st_buffer *STbp = STp->buffer; | |
2039 | DEB( char *name = tape_name(STp); ) | |
2040 | ||
28f85009 | 2041 | if (mutex_lock_interruptible(&STp->lock)) |
1da177e4 LT |
2042 | return -ERESTARTSYS; |
2043 | ||
2044 | retval = rw_checks(STp, filp, count); | |
2045 | if (retval || count == 0) | |
2046 | goto out; | |
2047 | ||
2048 | STm = &(STp->modes[STp->current_mode]); | |
9abe16c6 KM |
2049 | if (STp->block_size != 0 && (count % STp->block_size) != 0) { |
2050 | if (!STm->do_read_ahead) { | |
2051 | retval = (-EINVAL); /* Read must be integral number of blocks */ | |
2052 | goto out; | |
2053 | } | |
2054 | STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */ | |
1da177e4 LT |
2055 | } |
2056 | ||
2057 | STps = &(STp->ps[STp->partition]); | |
2058 | if (STps->rw == ST_WRITING) { | |
2059 | retval = flush_buffer(STp, 0); | |
2060 | if (retval) | |
2061 | goto out; | |
2062 | STps->rw = ST_READING; | |
2063 | } | |
2064 | DEB( | |
2065 | if (debugging && STps->eof != ST_NOEOF) | |
2066 | printk(ST_DEB_MSG "%s: EOF/EOM flag up (%d). Bytes %d\n", name, | |
2067 | STps->eof, STbp->buffer_bytes); | |
2068 | ) /* end DEB */ | |
2069 | ||
2070 | retval = setup_buffering(STp, buf, count, 1); | |
2071 | if (retval) | |
2072 | goto out; | |
2073 | do_dio = STbp->do_dio; | |
2074 | ||
2075 | if (STbp->buffer_bytes == 0 && | |
2076 | STps->eof >= ST_EOD_1) { | |
2077 | if (STps->eof < ST_EOD) { | |
2078 | STps->eof += 1; | |
2079 | retval = 0; | |
2080 | goto out; | |
2081 | } | |
2082 | retval = (-EIO); /* EOM or Blank Check */ | |
2083 | goto out; | |
2084 | } | |
2085 | ||
2086 | if (do_dio) { | |
2087 | /* Check the buffer writability before any tape movement. Don't alter | |
2088 | buffer data. */ | |
2089 | if (copy_from_user(&i, buf, 1) != 0 || | |
2090 | copy_to_user(buf, &i, 1) != 0 || | |
2091 | copy_from_user(&i, buf + count - 1, 1) != 0 || | |
2092 | copy_to_user(buf + count - 1, &i, 1) != 0) { | |
2093 | retval = (-EFAULT); | |
2094 | goto out; | |
2095 | } | |
2096 | } | |
2097 | ||
2098 | STps->rw = ST_READING; | |
2099 | ||
2100 | ||
2101 | /* Loop until enough data in buffer or a special condition found */ | |
2102 | for (total = 0, special = 0; total < count && !special;) { | |
2103 | ||
2104 | /* Get new data if the buffer is empty */ | |
2105 | if (STbp->buffer_bytes == 0) { | |
2106 | special = read_tape(STp, count - total, &SRpnt); | |
2107 | if (special < 0) { /* No need to continue read */ | |
2108 | retval = special; | |
2109 | goto out; | |
2110 | } | |
2111 | } | |
2112 | ||
2113 | /* Move the data from driver buffer to user buffer */ | |
2114 | if (STbp->buffer_bytes > 0) { | |
2115 | DEB( | |
2116 | if (debugging && STps->eof != ST_NOEOF) | |
2117 | printk(ST_DEB_MSG | |
2118 | "%s: EOF up (%d). Left %d, needed %d.\n", name, | |
2119 | STps->eof, STbp->buffer_bytes, | |
2120 | (int)(count - total)); | |
2121 | ) /* end DEB */ | |
2122 | transfer = STbp->buffer_bytes < count - total ? | |
2123 | STbp->buffer_bytes : count - total; | |
2124 | if (!do_dio) { | |
2125 | i = from_buffer(STbp, buf, transfer); | |
2126 | if (i) { | |
2127 | retval = i; | |
2128 | goto out; | |
2129 | } | |
2130 | } | |
2131 | buf += transfer; | |
2132 | total += transfer; | |
2133 | } | |
2134 | ||
2135 | if (STp->block_size == 0) | |
2136 | break; /* Read only one variable length block */ | |
2137 | ||
2138 | } /* for (total = 0, special = 0; | |
2139 | total < count && !special; ) */ | |
2140 | ||
2141 | /* Change the eof state if no data from tape or buffer */ | |
2142 | if (total == 0) { | |
2143 | if (STps->eof == ST_FM_HIT) { | |
2144 | STps->eof = ST_FM; | |
2145 | STps->drv_block = 0; | |
2146 | if (STps->drv_file >= 0) | |
2147 | STps->drv_file++; | |
2148 | } else if (STps->eof == ST_EOD_1) { | |
2149 | STps->eof = ST_EOD_2; | |
2150 | STps->drv_block = 0; | |
2151 | if (STps->drv_file >= 0) | |
2152 | STps->drv_file++; | |
2153 | } else if (STps->eof == ST_EOD_2) | |
2154 | STps->eof = ST_EOD; | |
2155 | } else if (STps->eof == ST_FM) | |
2156 | STps->eof = ST_NOEOF; | |
2157 | retval = total; | |
2158 | ||
2159 | out: | |
2160 | if (SRpnt != NULL) { | |
8b05b773 | 2161 | st_release_request(SRpnt); |
1da177e4 LT |
2162 | SRpnt = NULL; |
2163 | } | |
2164 | if (do_dio) { | |
787926b1 | 2165 | release_buffering(STp, 1); |
1da177e4 LT |
2166 | STbp->buffer_bytes = 0; |
2167 | } | |
28f85009 | 2168 | mutex_unlock(&STp->lock); |
1da177e4 LT |
2169 | |
2170 | return retval; | |
2171 | } | |
2172 | \f | |
2173 | ||
2174 | ||
2175 | DEB( | |
2176 | /* Set the driver options */ | |
2177 | static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm, char *name) | |
2178 | { | |
2179 | if (debugging) { | |
2180 | printk(KERN_INFO | |
2181 | "%s: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n", | |
2182 | name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes, | |
2183 | STm->do_read_ahead); | |
2184 | printk(KERN_INFO | |
2185 | "%s: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n", | |
2186 | name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock); | |
2187 | printk(KERN_INFO | |
2188 | "%s: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n", | |
2189 | name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions, | |
2190 | STp->scsi2_logical); | |
2191 | printk(KERN_INFO | |
c743e44f LD |
2192 | "%s: sysv: %d nowait: %d sili: %d nowait_filemark: %d\n", |
2193 | name, STm->sysv, STp->immediate, STp->sili, | |
2194 | STp->immediate_filemark); | |
1da177e4 LT |
2195 | printk(KERN_INFO "%s: debugging: %d\n", |
2196 | name, debugging); | |
2197 | } | |
2198 | } | |
2199 | ) | |
2200 | ||
2201 | ||
2202 | static int st_set_options(struct scsi_tape *STp, long options) | |
2203 | { | |
2204 | int value; | |
2205 | long code; | |
2206 | struct st_modedef *STm; | |
2207 | char *name = tape_name(STp); | |
2208 | struct cdev *cd0, *cd1; | |
2209 | ||
2210 | STm = &(STp->modes[STp->current_mode]); | |
2211 | if (!STm->defined) { | |
2212 | cd0 = STm->cdevs[0]; cd1 = STm->cdevs[1]; | |
2213 | memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); | |
2214 | STm->cdevs[0] = cd0; STm->cdevs[1] = cd1; | |
2215 | modes_defined = 1; | |
2216 | DEBC(printk(ST_DEB_MSG | |
2217 | "%s: Initialized mode %d definition from mode 0\n", | |
2218 | name, STp->current_mode)); | |
2219 | } | |
2220 | ||
2221 | code = options & MT_ST_OPTIONS; | |
2222 | if (code == MT_ST_BOOLEANS) { | |
2223 | STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; | |
2224 | STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; | |
2225 | STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; | |
2226 | STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; | |
2227 | STp->two_fm = (options & MT_ST_TWO_FM) != 0; | |
2228 | STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; | |
2229 | STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; | |
2230 | STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; | |
2231 | STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; | |
2232 | if ((STp->device)->scsi_level >= SCSI_2) | |
2233 | STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; | |
2234 | STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; | |
2235 | STp->immediate = (options & MT_ST_NOWAIT) != 0; | |
c743e44f | 2236 | STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0; |
1da177e4 | 2237 | STm->sysv = (options & MT_ST_SYSV) != 0; |
40f6b36c | 2238 | STp->sili = (options & MT_ST_SILI) != 0; |
1da177e4 LT |
2239 | DEB( debugging = (options & MT_ST_DEBUGGING) != 0; |
2240 | st_log_options(STp, STm, name); ) | |
2241 | } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { | |
2242 | value = (code == MT_ST_SETBOOLEANS); | |
2243 | if ((options & MT_ST_BUFFER_WRITES) != 0) | |
2244 | STm->do_buffer_writes = value; | |
2245 | if ((options & MT_ST_ASYNC_WRITES) != 0) | |
2246 | STm->do_async_writes = value; | |
2247 | if ((options & MT_ST_DEF_WRITES) != 0) | |
2248 | STm->defaults_for_writes = value; | |
2249 | if ((options & MT_ST_READ_AHEAD) != 0) | |
2250 | STm->do_read_ahead = value; | |
2251 | if ((options & MT_ST_TWO_FM) != 0) | |
2252 | STp->two_fm = value; | |
2253 | if ((options & MT_ST_FAST_MTEOM) != 0) | |
2254 | STp->fast_mteom = value; | |
2255 | if ((options & MT_ST_AUTO_LOCK) != 0) | |
2256 | STp->do_auto_lock = value; | |
2257 | if ((options & MT_ST_CAN_BSR) != 0) | |
2258 | STp->can_bsr = value; | |
2259 | if ((options & MT_ST_NO_BLKLIMS) != 0) | |
2260 | STp->omit_blklims = value; | |
2261 | if ((STp->device)->scsi_level >= SCSI_2 && | |
2262 | (options & MT_ST_CAN_PARTITIONS) != 0) | |
2263 | STp->can_partitions = value; | |
2264 | if ((options & MT_ST_SCSI2LOGICAL) != 0) | |
2265 | STp->scsi2_logical = value; | |
2266 | if ((options & MT_ST_NOWAIT) != 0) | |
2267 | STp->immediate = value; | |
c743e44f LD |
2268 | if ((options & MT_ST_NOWAIT_EOF) != 0) |
2269 | STp->immediate_filemark = value; | |
1da177e4 LT |
2270 | if ((options & MT_ST_SYSV) != 0) |
2271 | STm->sysv = value; | |
40f6b36c KM |
2272 | if ((options & MT_ST_SILI) != 0) |
2273 | STp->sili = value; | |
1da177e4 LT |
2274 | DEB( |
2275 | if ((options & MT_ST_DEBUGGING) != 0) | |
2276 | debugging = value; | |
2277 | st_log_options(STp, STm, name); ) | |
2278 | } else if (code == MT_ST_WRITE_THRESHOLD) { | |
2279 | /* Retained for compatibility */ | |
2280 | } else if (code == MT_ST_DEF_BLKSIZE) { | |
2281 | value = (options & ~MT_ST_OPTIONS); | |
2282 | if (value == ~MT_ST_OPTIONS) { | |
2283 | STm->default_blksize = (-1); | |
2284 | DEBC( printk(KERN_INFO "%s: Default block size disabled.\n", name)); | |
2285 | } else { | |
2286 | STm->default_blksize = value; | |
2287 | DEBC( printk(KERN_INFO "%s: Default block size set to %d bytes.\n", | |
2288 | name, STm->default_blksize)); | |
2289 | if (STp->ready == ST_READY) { | |
2290 | STp->blksize_changed = 0; | |
2291 | set_mode_densblk(STp, STm); | |
2292 | } | |
2293 | } | |
2294 | } else if (code == MT_ST_TIMEOUTS) { | |
2295 | value = (options & ~MT_ST_OPTIONS); | |
2296 | if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { | |
2297 | STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; | |
2298 | DEBC( printk(KERN_INFO "%s: Long timeout set to %d seconds.\n", name, | |
2299 | (value & ~MT_ST_SET_LONG_TIMEOUT))); | |
2300 | } else { | |
a02488ed JB |
2301 | blk_queue_rq_timeout(STp->device->request_queue, |
2302 | value * HZ); | |
1da177e4 LT |
2303 | DEBC( printk(KERN_INFO "%s: Normal timeout set to %d seconds.\n", |
2304 | name, value) ); | |
2305 | } | |
2306 | } else if (code == MT_ST_SET_CLN) { | |
2307 | value = (options & ~MT_ST_OPTIONS) & 0xff; | |
2308 | if (value != 0 && | |
832151f4 RK |
2309 | (value < EXTENDED_SENSE_START || |
2310 | value >= SCSI_SENSE_BUFFERSIZE)) | |
1da177e4 LT |
2311 | return (-EINVAL); |
2312 | STp->cln_mode = value; | |
2313 | STp->cln_sense_mask = (options >> 8) & 0xff; | |
2314 | STp->cln_sense_value = (options >> 16) & 0xff; | |
2315 | printk(KERN_INFO | |
2316 | "%s: Cleaning request mode %d, mask %02x, value %02x\n", | |
2317 | name, value, STp->cln_sense_mask, STp->cln_sense_value); | |
2318 | } else if (code == MT_ST_DEF_OPTIONS) { | |
2319 | code = (options & ~MT_ST_CLEAR_DEFAULT); | |
2320 | value = (options & MT_ST_CLEAR_DEFAULT); | |
2321 | if (code == MT_ST_DEF_DENSITY) { | |
2322 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2323 | STm->default_density = (-1); | |
2324 | DEBC( printk(KERN_INFO "%s: Density default disabled.\n", | |
2325 | name)); | |
2326 | } else { | |
2327 | STm->default_density = value & 0xff; | |
2328 | DEBC( printk(KERN_INFO "%s: Density default set to %x\n", | |
2329 | name, STm->default_density)); | |
2330 | if (STp->ready == ST_READY) { | |
2331 | STp->density_changed = 0; | |
2332 | set_mode_densblk(STp, STm); | |
2333 | } | |
2334 | } | |
2335 | } else if (code == MT_ST_DEF_DRVBUFFER) { | |
2336 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2337 | STp->default_drvbuffer = 0xff; | |
2338 | DEBC( printk(KERN_INFO | |
2339 | "%s: Drive buffer default disabled.\n", name)); | |
2340 | } else { | |
2341 | STp->default_drvbuffer = value & 7; | |
2342 | DEBC( printk(KERN_INFO | |
2343 | "%s: Drive buffer default set to %x\n", | |
2344 | name, STp->default_drvbuffer)); | |
2345 | if (STp->ready == ST_READY) | |
2346 | st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer); | |
2347 | } | |
2348 | } else if (code == MT_ST_DEF_COMPRESSION) { | |
2349 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2350 | STm->default_compression = ST_DONT_TOUCH; | |
2351 | DEBC( printk(KERN_INFO | |
2352 | "%s: Compression default disabled.\n", name)); | |
2353 | } else { | |
2354 | if ((value & 0xff00) != 0) { | |
2355 | STp->c_algo = (value & 0xff00) >> 8; | |
2356 | DEBC( printk(KERN_INFO "%s: Compression algorithm set to 0x%x.\n", | |
2357 | name, STp->c_algo)); | |
2358 | } | |
2359 | if ((value & 0xff) != 0xff) { | |
2360 | STm->default_compression = (value & 1 ? ST_YES : ST_NO); | |
2361 | DEBC( printk(KERN_INFO "%s: Compression default set to %x\n", | |
2362 | name, (value & 1))); | |
2363 | if (STp->ready == ST_READY) { | |
2364 | STp->compression_changed = 0; | |
2365 | st_compression(STp, (STm->default_compression == ST_YES)); | |
2366 | } | |
2367 | } | |
2368 | } | |
2369 | } | |
2370 | } else | |
2371 | return (-EIO); | |
2372 | ||
2373 | return 0; | |
2374 | } | |
2375 | \f | |
2376 | #define MODE_HEADER_LENGTH 4 | |
2377 | ||
2378 | /* Mode header and page byte offsets */ | |
2379 | #define MH_OFF_DATA_LENGTH 0 | |
2380 | #define MH_OFF_MEDIUM_TYPE 1 | |
2381 | #define MH_OFF_DEV_SPECIFIC 2 | |
2382 | #define MH_OFF_BDESCS_LENGTH 3 | |
2383 | #define MP_OFF_PAGE_NBR 0 | |
2384 | #define MP_OFF_PAGE_LENGTH 1 | |
2385 | ||
2386 | /* Mode header and page bit masks */ | |
2387 | #define MH_BIT_WP 0x80 | |
2388 | #define MP_MSK_PAGE_NBR 0x3f | |
2389 | ||
2390 | /* Don't return block descriptors */ | |
2391 | #define MODE_SENSE_OMIT_BDESCS 0x08 | |
2392 | ||
2393 | #define MODE_SELECT_PAGE_FORMAT 0x10 | |
2394 | ||
2395 | /* Read a mode page into the tape buffer. The block descriptors are included | |
2396 | if incl_block_descs is true. The page control is ored to the page number | |
2397 | parameter, if necessary. */ | |
2398 | static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) | |
2399 | { | |
2400 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8ecf0d99 | 2401 | struct st_request *SRpnt; |
1da177e4 LT |
2402 | |
2403 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2404 | cmd[0] = MODE_SENSE; | |
2405 | if (omit_block_descs) | |
2406 | cmd[1] = MODE_SENSE_OMIT_BDESCS; | |
2407 | cmd[2] = page; | |
2408 | cmd[4] = 255; | |
2409 | ||
02ae2c0e KM |
2410 | SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE, |
2411 | STp->device->request_queue->rq_timeout, 0, 1); | |
2412 | if (SRpnt == NULL) | |
2413 | return (STp->buffer)->syscall_result; | |
1da177e4 | 2414 | |
8b05b773 | 2415 | st_release_request(SRpnt); |
1da177e4 | 2416 | |
02ae2c0e | 2417 | return STp->buffer->syscall_result; |
1da177e4 LT |
2418 | } |
2419 | ||
2420 | ||
2421 | /* Send the mode page in the tape buffer to the drive. Assumes that the mode data | |
2422 | in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ | |
2423 | static int write_mode_page(struct scsi_tape *STp, int page, int slow) | |
2424 | { | |
02ae2c0e | 2425 | int pgo; |
1da177e4 | 2426 | unsigned char cmd[MAX_COMMAND_SIZE]; |
18c87015 | 2427 | struct st_request *SRpnt; |
02ae2c0e | 2428 | int timeout; |
1da177e4 LT |
2429 | |
2430 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2431 | cmd[0] = MODE_SELECT; | |
2432 | cmd[1] = MODE_SELECT_PAGE_FORMAT; | |
2433 | pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH]; | |
2434 | cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2; | |
2435 | ||
2436 | /* Clear reserved fields */ | |
2437 | (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0; | |
2438 | (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0; | |
2439 | (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; | |
2440 | (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; | |
2441 | ||
02ae2c0e KM |
2442 | timeout = slow ? |
2443 | STp->long_timeout : STp->device->request_queue->rq_timeout; | |
2444 | SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE, | |
2445 | timeout, 0, 1); | |
2446 | if (SRpnt == NULL) | |
2447 | return (STp->buffer)->syscall_result; | |
1da177e4 | 2448 | |
8b05b773 | 2449 | st_release_request(SRpnt); |
1da177e4 | 2450 | |
02ae2c0e | 2451 | return STp->buffer->syscall_result; |
1da177e4 LT |
2452 | } |
2453 | ||
2454 | ||
2455 | #define COMPRESSION_PAGE 0x0f | |
2456 | #define COMPRESSION_PAGE_LENGTH 16 | |
2457 | ||
2458 | #define CP_OFF_DCE_DCC 2 | |
2459 | #define CP_OFF_C_ALGO 7 | |
2460 | ||
2461 | #define DCE_MASK 0x80 | |
2462 | #define DCC_MASK 0x40 | |
2463 | #define RED_MASK 0x60 | |
2464 | ||
2465 | ||
2466 | /* Control the compression with mode page 15. Algorithm not changed if zero. | |
2467 | ||
2468 | The block descriptors are read and written because Sony SDT-7000 does not | |
2469 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). | |
2470 | Including block descriptors should not cause any harm to other drives. */ | |
2471 | ||
2472 | static int st_compression(struct scsi_tape * STp, int state) | |
2473 | { | |
2474 | int retval; | |
2475 | int mpoffs; /* Offset to mode page start */ | |
2476 | unsigned char *b_data = (STp->buffer)->b_data; | |
2477 | DEB( char *name = tape_name(STp); ) | |
2478 | ||
2479 | if (STp->ready != ST_READY) | |
2480 | return (-EIO); | |
2481 | ||
2482 | /* Read the current page contents */ | |
2483 | retval = read_mode_page(STp, COMPRESSION_PAGE, 0); | |
2484 | if (retval) { | |
2485 | DEBC(printk(ST_DEB_MSG "%s: Compression mode page not supported.\n", | |
2486 | name)); | |
2487 | return (-EIO); | |
2488 | } | |
2489 | ||
2490 | mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; | |
2491 | DEBC(printk(ST_DEB_MSG "%s: Compression state is %d.\n", name, | |
2492 | (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0))); | |
2493 | ||
2494 | /* Check if compression can be changed */ | |
2495 | if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) { | |
2496 | DEBC(printk(ST_DEB_MSG "%s: Compression not supported.\n", name)); | |
2497 | return (-EIO); | |
2498 | } | |
2499 | ||
2500 | /* Do the change */ | |
2501 | if (state) { | |
2502 | b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK; | |
2503 | if (STp->c_algo != 0) | |
2504 | b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo; | |
2505 | } | |
2506 | else { | |
2507 | b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK; | |
2508 | if (STp->c_algo != 0) | |
2509 | b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */ | |
2510 | } | |
2511 | ||
2512 | retval = write_mode_page(STp, COMPRESSION_PAGE, 0); | |
2513 | if (retval) { | |
2514 | DEBC(printk(ST_DEB_MSG "%s: Compression change failed.\n", name)); | |
2515 | return (-EIO); | |
2516 | } | |
2517 | DEBC(printk(ST_DEB_MSG "%s: Compression state changed to %d.\n", | |
2518 | name, state)); | |
2519 | ||
2520 | STp->compression_changed = 1; | |
2521 | return 0; | |
2522 | } | |
2523 | ||
2524 | ||
2525 | /* Process the load and unload commands (does unload if the load code is zero) */ | |
2526 | static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code) | |
2527 | { | |
2528 | int retval = (-EIO), timeout; | |
2529 | DEB( char *name = tape_name(STp); ) | |
2530 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
2531 | struct st_partstat *STps; | |
8b05b773 | 2532 | struct st_request *SRpnt; |
1da177e4 LT |
2533 | |
2534 | if (STp->ready != ST_READY && !load_code) { | |
2535 | if (STp->ready == ST_NO_TAPE) | |
2536 | return (-ENOMEDIUM); | |
2537 | else | |
2538 | return (-EIO); | |
2539 | } | |
2540 | ||
2541 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2542 | cmd[0] = START_STOP; | |
2543 | if (load_code) | |
2544 | cmd[4] |= 1; | |
2545 | /* | |
2546 | * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A | |
2547 | */ | |
2548 | if (load_code >= 1 + MT_ST_HPLOADER_OFFSET | |
2549 | && load_code <= 6 + MT_ST_HPLOADER_OFFSET) { | |
2550 | DEBC(printk(ST_DEB_MSG "%s: Enhanced %sload slot %2d.\n", | |
2551 | name, (cmd[4]) ? "" : "un", | |
2552 | load_code - MT_ST_HPLOADER_OFFSET)); | |
2553 | cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ | |
2554 | } | |
2555 | if (STp->immediate) { | |
2556 | cmd[1] = 1; /* Don't wait for completion */ | |
a02488ed | 2557 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
2558 | } |
2559 | else | |
2560 | timeout = STp->long_timeout; | |
2561 | ||
2562 | DEBC( | |
2563 | if (!load_code) | |
2564 | printk(ST_DEB_MSG "%s: Unloading tape.\n", name); | |
2565 | else | |
2566 | printk(ST_DEB_MSG "%s: Loading tape.\n", name); | |
2567 | ); | |
2568 | ||
02ae2c0e KM |
2569 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
2570 | timeout, MAX_RETRIES, 1); | |
1da177e4 | 2571 | if (!SRpnt) |
02ae2c0e | 2572 | return (STp->buffer)->syscall_result; |
1da177e4 LT |
2573 | |
2574 | retval = (STp->buffer)->syscall_result; | |
02ae2c0e | 2575 | st_release_request(SRpnt); |
1da177e4 LT |
2576 | |
2577 | if (!retval) { /* SCSI command successful */ | |
2578 | ||
2579 | if (!load_code) { | |
2580 | STp->rew_at_close = 0; | |
2581 | STp->ready = ST_NO_TAPE; | |
2582 | } | |
2583 | else { | |
2584 | STp->rew_at_close = STp->autorew_dev; | |
2585 | retval = check_tape(STp, filp); | |
2586 | if (retval > 0) | |
2587 | retval = 0; | |
2588 | } | |
2589 | } | |
2590 | else { | |
2591 | STps = &(STp->ps[STp->partition]); | |
2592 | STps->drv_file = STps->drv_block = (-1); | |
2593 | } | |
2594 | ||
2595 | return retval; | |
2596 | } | |
2597 | \f | |
2598 | #if DEBUG | |
2599 | #define ST_DEB_FORWARD 0 | |
2600 | #define ST_DEB_BACKWARD 1 | |
2601 | static void deb_space_print(char *name, int direction, char *units, unsigned char *cmd) | |
2602 | { | |
2603 | s32 sc; | |
2604 | ||
2605 | sc = cmd[2] & 0x80 ? 0xff000000 : 0; | |
2606 | sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; | |
2607 | if (direction) | |
2608 | sc = -sc; | |
2609 | printk(ST_DEB_MSG "%s: Spacing tape %s over %d %s.\n", name, | |
2610 | direction ? "backward" : "forward", sc, units); | |
2611 | } | |
2612 | #endif | |
2613 | ||
2614 | ||
2615 | /* Internal ioctl function */ | |
2616 | static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) | |
2617 | { | |
2618 | int timeout; | |
2619 | long ltmp; | |
2620 | int ioctl_result; | |
2621 | int chg_eof = 1; | |
2622 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 2623 | struct st_request *SRpnt; |
1da177e4 LT |
2624 | struct st_partstat *STps; |
2625 | int fileno, blkno, at_sm, undone; | |
2626 | int datalen = 0, direction = DMA_NONE; | |
2627 | char *name = tape_name(STp); | |
2628 | ||
2629 | WARN_ON(STp->buffer->do_dio != 0); | |
2630 | if (STp->ready != ST_READY) { | |
2631 | if (STp->ready == ST_NO_TAPE) | |
2632 | return (-ENOMEDIUM); | |
2633 | else | |
2634 | return (-EIO); | |
2635 | } | |
2636 | timeout = STp->long_timeout; | |
2637 | STps = &(STp->ps[STp->partition]); | |
2638 | fileno = STps->drv_file; | |
2639 | blkno = STps->drv_block; | |
2640 | at_sm = STps->at_sm; | |
2641 | ||
2642 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2643 | switch (cmd_in) { | |
2644 | case MTFSFM: | |
2645 | chg_eof = 0; /* Changed from the FSF after this */ | |
2646 | case MTFSF: | |
2647 | cmd[0] = SPACE; | |
2648 | cmd[1] = 0x01; /* Space FileMarks */ | |
2649 | cmd[2] = (arg >> 16); | |
2650 | cmd[3] = (arg >> 8); | |
2651 | cmd[4] = arg; | |
2652 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "filemarks", cmd);) | |
2653 | if (fileno >= 0) | |
2654 | fileno += arg; | |
2655 | blkno = 0; | |
2656 | at_sm &= (arg == 0); | |
2657 | break; | |
2658 | case MTBSFM: | |
2659 | chg_eof = 0; /* Changed from the FSF after this */ | |
2660 | case MTBSF: | |
2661 | cmd[0] = SPACE; | |
2662 | cmd[1] = 0x01; /* Space FileMarks */ | |
2663 | ltmp = (-arg); | |
2664 | cmd[2] = (ltmp >> 16); | |
2665 | cmd[3] = (ltmp >> 8); | |
2666 | cmd[4] = ltmp; | |
2667 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "filemarks", cmd);) | |
2668 | if (fileno >= 0) | |
2669 | fileno -= arg; | |
2670 | blkno = (-1); /* We can't know the block number */ | |
2671 | at_sm &= (arg == 0); | |
2672 | break; | |
2673 | case MTFSR: | |
2674 | cmd[0] = SPACE; | |
2675 | cmd[1] = 0x00; /* Space Blocks */ | |
2676 | cmd[2] = (arg >> 16); | |
2677 | cmd[3] = (arg >> 8); | |
2678 | cmd[4] = arg; | |
2679 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "blocks", cmd);) | |
2680 | if (blkno >= 0) | |
2681 | blkno += arg; | |
2682 | at_sm &= (arg == 0); | |
2683 | break; | |
2684 | case MTBSR: | |
2685 | cmd[0] = SPACE; | |
2686 | cmd[1] = 0x00; /* Space Blocks */ | |
2687 | ltmp = (-arg); | |
2688 | cmd[2] = (ltmp >> 16); | |
2689 | cmd[3] = (ltmp >> 8); | |
2690 | cmd[4] = ltmp; | |
2691 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "blocks", cmd);) | |
2692 | if (blkno >= 0) | |
2693 | blkno -= arg; | |
2694 | at_sm &= (arg == 0); | |
2695 | break; | |
2696 | case MTFSS: | |
2697 | cmd[0] = SPACE; | |
2698 | cmd[1] = 0x04; /* Space Setmarks */ | |
2699 | cmd[2] = (arg >> 16); | |
2700 | cmd[3] = (arg >> 8); | |
2701 | cmd[4] = arg; | |
2702 | DEBC(deb_space_print(name, ST_DEB_FORWARD, "setmarks", cmd);) | |
2703 | if (arg != 0) { | |
2704 | blkno = fileno = (-1); | |
2705 | at_sm = 1; | |
2706 | } | |
2707 | break; | |
2708 | case MTBSS: | |
2709 | cmd[0] = SPACE; | |
2710 | cmd[1] = 0x04; /* Space Setmarks */ | |
2711 | ltmp = (-arg); | |
2712 | cmd[2] = (ltmp >> 16); | |
2713 | cmd[3] = (ltmp >> 8); | |
2714 | cmd[4] = ltmp; | |
2715 | DEBC(deb_space_print(name, ST_DEB_BACKWARD, "setmarks", cmd);) | |
2716 | if (arg != 0) { | |
2717 | blkno = fileno = (-1); | |
2718 | at_sm = 1; | |
2719 | } | |
2720 | break; | |
2721 | case MTWEOF: | |
3e51d3c9 | 2722 | case MTWEOFI: |
1da177e4 LT |
2723 | case MTWSM: |
2724 | if (STp->write_prot) | |
2725 | return (-EACCES); | |
2726 | cmd[0] = WRITE_FILEMARKS; | |
2727 | if (cmd_in == MTWSM) | |
2728 | cmd[1] = 2; | |
c743e44f LD |
2729 | if (cmd_in == MTWEOFI || |
2730 | (cmd_in == MTWEOF && STp->immediate_filemark)) | |
3e51d3c9 | 2731 | cmd[1] |= 1; |
1da177e4 LT |
2732 | cmd[2] = (arg >> 16); |
2733 | cmd[3] = (arg >> 8); | |
2734 | cmd[4] = arg; | |
a02488ed | 2735 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 | 2736 | DEBC( |
3e51d3c9 | 2737 | if (cmd_in != MTWSM) |
1da177e4 LT |
2738 | printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name, |
2739 | cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); | |
2740 | else | |
2741 | printk(ST_DEB_MSG "%s: Writing %d setmarks.\n", name, | |
2742 | cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); | |
2743 | ) | |
2744 | if (fileno >= 0) | |
2745 | fileno += arg; | |
2746 | blkno = 0; | |
2747 | at_sm = (cmd_in == MTWSM); | |
2748 | break; | |
2749 | case MTREW: | |
2750 | cmd[0] = REZERO_UNIT; | |
2751 | if (STp->immediate) { | |
2752 | cmd[1] = 1; /* Don't wait for completion */ | |
a02488ed | 2753 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
2754 | } |
2755 | DEBC(printk(ST_DEB_MSG "%s: Rewinding tape.\n", name)); | |
2756 | fileno = blkno = at_sm = 0; | |
2757 | break; | |
2758 | case MTNOP: | |
2759 | DEBC(printk(ST_DEB_MSG "%s: No op on tape.\n", name)); | |
2760 | return 0; /* Should do something ? */ | |
2761 | break; | |
2762 | case MTRETEN: | |
2763 | cmd[0] = START_STOP; | |
2764 | if (STp->immediate) { | |
2765 | cmd[1] = 1; /* Don't wait for completion */ | |
a02488ed | 2766 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
2767 | } |
2768 | cmd[4] = 3; | |
2769 | DEBC(printk(ST_DEB_MSG "%s: Retensioning tape.\n", name)); | |
2770 | fileno = blkno = at_sm = 0; | |
2771 | break; | |
2772 | case MTEOM: | |
2773 | if (!STp->fast_mteom) { | |
2774 | /* space to the end of tape */ | |
2775 | ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); | |
2776 | fileno = STps->drv_file; | |
2777 | if (STps->eof >= ST_EOD_1) | |
2778 | return 0; | |
2779 | /* The next lines would hide the number of spaced FileMarks | |
2780 | That's why I inserted the previous lines. I had no luck | |
2781 | with detecting EOM with FSF, so we go now to EOM. | |
2782 | Joerg Weule */ | |
2783 | } else | |
2784 | fileno = (-1); | |
2785 | cmd[0] = SPACE; | |
2786 | cmd[1] = 3; | |
2787 | DEBC(printk(ST_DEB_MSG "%s: Spacing to end of recorded medium.\n", | |
2788 | name)); | |
2789 | blkno = -1; | |
2790 | at_sm = 0; | |
2791 | break; | |
2792 | case MTERASE: | |
2793 | if (STp->write_prot) | |
2794 | return (-EACCES); | |
2795 | cmd[0] = ERASE; | |
2796 | cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ | |
2797 | if (STp->immediate) { | |
2798 | cmd[1] |= 2; /* Don't wait for completion */ | |
a02488ed | 2799 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
2800 | } |
2801 | else | |
2802 | timeout = STp->long_timeout * 8; | |
2803 | ||
2804 | DEBC(printk(ST_DEB_MSG "%s: Erasing tape.\n", name)); | |
2805 | fileno = blkno = at_sm = 0; | |
2806 | break; | |
2807 | case MTSETBLK: /* Set block length */ | |
2808 | case MTSETDENSITY: /* Set tape density */ | |
2809 | case MTSETDRVBUFFER: /* Set drive buffering */ | |
2810 | case SET_DENS_AND_BLK: /* Set density and block size */ | |
2811 | chg_eof = 0; | |
2812 | if (STp->dirty || (STp->buffer)->buffer_bytes != 0) | |
2813 | return (-EIO); /* Not allowed if data in buffer */ | |
2814 | if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && | |
2815 | (arg & MT_ST_BLKSIZE_MASK) != 0 && | |
2816 | STp->max_block > 0 && | |
2817 | ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || | |
2818 | (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { | |
2819 | printk(KERN_WARNING "%s: Illegal block size.\n", name); | |
2820 | return (-EINVAL); | |
2821 | } | |
2822 | cmd[0] = MODE_SELECT; | |
2823 | if ((STp->use_pf & USE_PF)) | |
2824 | cmd[1] = MODE_SELECT_PAGE_FORMAT; | |
2825 | cmd[4] = datalen = 12; | |
2826 | direction = DMA_TO_DEVICE; | |
2827 | ||
2828 | memset((STp->buffer)->b_data, 0, 12); | |
2829 | if (cmd_in == MTSETDRVBUFFER) | |
2830 | (STp->buffer)->b_data[2] = (arg & 7) << 4; | |
2831 | else | |
2832 | (STp->buffer)->b_data[2] = | |
2833 | STp->drv_buffer << 4; | |
2834 | (STp->buffer)->b_data[3] = 8; /* block descriptor length */ | |
2835 | if (cmd_in == MTSETDENSITY) { | |
2836 | (STp->buffer)->b_data[4] = arg; | |
2837 | STp->density_changed = 1; /* At least we tried ;-) */ | |
2838 | } else if (cmd_in == SET_DENS_AND_BLK) | |
2839 | (STp->buffer)->b_data[4] = arg >> 24; | |
2840 | else | |
2841 | (STp->buffer)->b_data[4] = STp->density; | |
2842 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { | |
2843 | ltmp = arg & MT_ST_BLKSIZE_MASK; | |
2844 | if (cmd_in == MTSETBLK) | |
2845 | STp->blksize_changed = 1; /* At least we tried ;-) */ | |
2846 | } else | |
2847 | ltmp = STp->block_size; | |
2848 | (STp->buffer)->b_data[9] = (ltmp >> 16); | |
2849 | (STp->buffer)->b_data[10] = (ltmp >> 8); | |
2850 | (STp->buffer)->b_data[11] = ltmp; | |
a02488ed | 2851 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
2852 | DEBC( |
2853 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) | |
2854 | printk(ST_DEB_MSG | |
2855 | "%s: Setting block size to %d bytes.\n", name, | |
2856 | (STp->buffer)->b_data[9] * 65536 + | |
2857 | (STp->buffer)->b_data[10] * 256 + | |
2858 | (STp->buffer)->b_data[11]); | |
2859 | if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) | |
2860 | printk(ST_DEB_MSG | |
2861 | "%s: Setting density code to %x.\n", name, | |
2862 | (STp->buffer)->b_data[4]); | |
2863 | if (cmd_in == MTSETDRVBUFFER) | |
2864 | printk(ST_DEB_MSG | |
2865 | "%s: Setting drive buffer code to %d.\n", name, | |
2866 | ((STp->buffer)->b_data[2] >> 4) & 7); | |
2867 | ) | |
2868 | break; | |
2869 | default: | |
2870 | return (-ENOSYS); | |
2871 | } | |
2872 | ||
02ae2c0e KM |
2873 | SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, |
2874 | timeout, MAX_RETRIES, 1); | |
1da177e4 LT |
2875 | if (!SRpnt) |
2876 | return (STp->buffer)->syscall_result; | |
2877 | ||
02ae2c0e | 2878 | ioctl_result = (STp->buffer)->syscall_result; |
1da177e4 LT |
2879 | |
2880 | if (!ioctl_result) { /* SCSI command successful */ | |
8b05b773 | 2881 | st_release_request(SRpnt); |
1da177e4 LT |
2882 | SRpnt = NULL; |
2883 | STps->drv_block = blkno; | |
2884 | STps->drv_file = fileno; | |
2885 | STps->at_sm = at_sm; | |
2886 | ||
2887 | if (cmd_in == MTBSFM) | |
2888 | ioctl_result = st_int_ioctl(STp, MTFSF, 1); | |
2889 | else if (cmd_in == MTFSFM) | |
2890 | ioctl_result = st_int_ioctl(STp, MTBSF, 1); | |
2891 | ||
2892 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { | |
1da177e4 LT |
2893 | STp->block_size = arg & MT_ST_BLKSIZE_MASK; |
2894 | if (STp->block_size != 0) { | |
1da177e4 LT |
2895 | (STp->buffer)->buffer_blocks = |
2896 | (STp->buffer)->buffer_size / STp->block_size; | |
2897 | } | |
2898 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; | |
2899 | if (cmd_in == SET_DENS_AND_BLK) | |
2900 | STp->density = arg >> MT_ST_DENSITY_SHIFT; | |
2901 | } else if (cmd_in == MTSETDRVBUFFER) | |
2902 | STp->drv_buffer = (arg & 7); | |
2903 | else if (cmd_in == MTSETDENSITY) | |
2904 | STp->density = arg; | |
2905 | ||
2906 | if (cmd_in == MTEOM) | |
2907 | STps->eof = ST_EOD; | |
2908 | else if (cmd_in == MTFSF) | |
2909 | STps->eof = ST_FM; | |
2910 | else if (chg_eof) | |
2911 | STps->eof = ST_NOEOF; | |
2912 | ||
3e51d3c9 KM |
2913 | if (cmd_in == MTWEOF || cmd_in == MTWEOFI) |
2914 | STps->rw = ST_IDLE; /* prevent automatic WEOF at close */ | |
1da177e4 LT |
2915 | } else { /* SCSI command was not completely successful. Don't return |
2916 | from this block without releasing the SCSI command block! */ | |
2917 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
2918 | ||
2919 | if (cmdstatp->flags & SENSE_EOM) { | |
2920 | if (cmd_in != MTBSF && cmd_in != MTBSFM && | |
2921 | cmd_in != MTBSR && cmd_in != MTBSS) | |
2922 | STps->eof = ST_EOM_OK; | |
2923 | STps->drv_block = 0; | |
2924 | } | |
2925 | ||
2926 | if (cmdstatp->remainder_valid) | |
2927 | undone = (int)cmdstatp->uremainder64; | |
2928 | else | |
2929 | undone = 0; | |
2930 | ||
3e51d3c9 | 2931 | if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) && |
1da177e4 | 2932 | cmdstatp->have_sense && |
91614c05 KM |
2933 | (cmdstatp->flags & SENSE_EOM)) { |
2934 | if (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
2935 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { | |
2936 | ioctl_result = 0; /* EOF(s) written successfully at EOM */ | |
2937 | STps->eof = ST_NOEOF; | |
2938 | } else { /* Writing EOF(s) failed */ | |
2939 | if (fileno >= 0) | |
2940 | fileno -= undone; | |
2941 | if (undone < arg) | |
2942 | STps->eof = ST_NOEOF; | |
2943 | } | |
1da177e4 | 2944 | STps->drv_file = fileno; |
1da177e4 LT |
2945 | } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { |
2946 | if (fileno >= 0) | |
2947 | STps->drv_file = fileno - undone; | |
2948 | else | |
2949 | STps->drv_file = fileno; | |
2950 | STps->drv_block = -1; | |
2951 | STps->eof = ST_NOEOF; | |
2952 | } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { | |
2953 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ | |
2954 | undone = (-undone); | |
2955 | if (STps->drv_file >= 0) | |
2956 | STps->drv_file = fileno + undone; | |
2957 | STps->drv_block = 0; | |
2958 | STps->eof = ST_NOEOF; | |
2959 | } else if (cmd_in == MTFSR) { | |
2960 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ | |
2961 | if (STps->drv_file >= 0) | |
2962 | STps->drv_file++; | |
2963 | STps->drv_block = 0; | |
2964 | STps->eof = ST_FM; | |
2965 | } else { | |
2966 | if (blkno >= undone) | |
2967 | STps->drv_block = blkno - undone; | |
2968 | else | |
2969 | STps->drv_block = (-1); | |
2970 | STps->eof = ST_NOEOF; | |
2971 | } | |
2972 | } else if (cmd_in == MTBSR) { | |
2973 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ | |
2974 | STps->drv_file--; | |
2975 | STps->drv_block = (-1); | |
2976 | } else { | |
2977 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ | |
2978 | undone = (-undone); | |
2979 | if (STps->drv_block >= 0) | |
2980 | STps->drv_block = blkno + undone; | |
2981 | } | |
2982 | STps->eof = ST_NOEOF; | |
2983 | } else if (cmd_in == MTEOM) { | |
2984 | STps->drv_file = (-1); | |
2985 | STps->drv_block = (-1); | |
2986 | STps->eof = ST_EOD; | |
2987 | } else if (cmd_in == MTSETBLK || | |
2988 | cmd_in == MTSETDENSITY || | |
2989 | cmd_in == MTSETDRVBUFFER || | |
2990 | cmd_in == SET_DENS_AND_BLK) { | |
2991 | if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && | |
2992 | !(STp->use_pf & PF_TESTED)) { | |
2993 | /* Try the other possible state of Page Format if not | |
2994 | already tried */ | |
1da2019f | 2995 | STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED; |
8b05b773 | 2996 | st_release_request(SRpnt); |
1da177e4 LT |
2997 | SRpnt = NULL; |
2998 | return st_int_ioctl(STp, cmd_in, arg); | |
2999 | } | |
3000 | } else if (chg_eof) | |
3001 | STps->eof = ST_NOEOF; | |
3002 | ||
3003 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) | |
3004 | STps->eof = ST_EOD; | |
3005 | ||
8b05b773 | 3006 | st_release_request(SRpnt); |
1da177e4 LT |
3007 | SRpnt = NULL; |
3008 | } | |
3009 | ||
3010 | return ioctl_result; | |
3011 | } | |
3012 | \f | |
3013 | ||
3014 | /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc | |
3015 | structure. */ | |
3016 | ||
3017 | static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, | |
3018 | int logical) | |
3019 | { | |
3020 | int result; | |
3021 | unsigned char scmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 3022 | struct st_request *SRpnt; |
1da177e4 LT |
3023 | DEB( char *name = tape_name(STp); ) |
3024 | ||
3025 | if (STp->ready != ST_READY) | |
3026 | return (-EIO); | |
3027 | ||
3028 | memset(scmd, 0, MAX_COMMAND_SIZE); | |
3029 | if ((STp->device)->scsi_level < SCSI_2) { | |
3030 | scmd[0] = QFA_REQUEST_BLOCK; | |
3031 | scmd[4] = 3; | |
3032 | } else { | |
3033 | scmd[0] = READ_POSITION; | |
3034 | if (!logical && !STp->scsi2_logical) | |
3035 | scmd[1] = 1; | |
3036 | } | |
02ae2c0e KM |
3037 | SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, |
3038 | STp->device->request_queue->rq_timeout, | |
3039 | MAX_READY_RETRIES, 1); | |
1da177e4 | 3040 | if (!SRpnt) |
02ae2c0e | 3041 | return (STp->buffer)->syscall_result; |
1da177e4 LT |
3042 | |
3043 | if ((STp->buffer)->syscall_result != 0 || | |
3044 | (STp->device->scsi_level >= SCSI_2 && | |
3045 | ((STp->buffer)->b_data[0] & 4) != 0)) { | |
3046 | *block = *partition = 0; | |
3047 | DEBC(printk(ST_DEB_MSG "%s: Can't read tape position.\n", name)); | |
3048 | result = (-EIO); | |
3049 | } else { | |
3050 | result = 0; | |
3051 | if ((STp->device)->scsi_level < SCSI_2) { | |
3052 | *block = ((STp->buffer)->b_data[0] << 16) | |
3053 | + ((STp->buffer)->b_data[1] << 8) | |
3054 | + (STp->buffer)->b_data[2]; | |
3055 | *partition = 0; | |
3056 | } else { | |
3057 | *block = ((STp->buffer)->b_data[4] << 24) | |
3058 | + ((STp->buffer)->b_data[5] << 16) | |
3059 | + ((STp->buffer)->b_data[6] << 8) | |
3060 | + (STp->buffer)->b_data[7]; | |
3061 | *partition = (STp->buffer)->b_data[1]; | |
3062 | if (((STp->buffer)->b_data[0] & 0x80) && | |
3063 | (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ | |
3064 | STp->ps[0].drv_block = STp->ps[0].drv_file = 0; | |
3065 | } | |
3066 | DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name, | |
3067 | *block, *partition)); | |
3068 | } | |
8b05b773 | 3069 | st_release_request(SRpnt); |
1da177e4 LT |
3070 | SRpnt = NULL; |
3071 | ||
3072 | return result; | |
3073 | } | |
3074 | ||
3075 | ||
3076 | /* Set the tape block and partition. Negative partition means that only the | |
3077 | block should be set in vendor specific way. */ | |
3078 | static int set_location(struct scsi_tape *STp, unsigned int block, int partition, | |
3079 | int logical) | |
3080 | { | |
3081 | struct st_partstat *STps; | |
3082 | int result, p; | |
3083 | unsigned int blk; | |
3084 | int timeout; | |
3085 | unsigned char scmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 3086 | struct st_request *SRpnt; |
1da177e4 LT |
3087 | DEB( char *name = tape_name(STp); ) |
3088 | ||
3089 | if (STp->ready != ST_READY) | |
3090 | return (-EIO); | |
3091 | timeout = STp->long_timeout; | |
3092 | STps = &(STp->ps[STp->partition]); | |
3093 | ||
3094 | DEBC(printk(ST_DEB_MSG "%s: Setting block to %d and partition to %d.\n", | |
3095 | name, block, partition)); | |
3096 | DEB(if (partition < 0) | |
3097 | return (-EIO); ) | |
3098 | ||
3099 | /* Update the location at the partition we are leaving */ | |
3100 | if ((!STp->can_partitions && partition != 0) || | |
3101 | partition >= ST_NBR_PARTITIONS) | |
3102 | return (-EINVAL); | |
3103 | if (partition != STp->partition) { | |
3104 | if (get_location(STp, &blk, &p, 1)) | |
3105 | STps->last_block_valid = 0; | |
3106 | else { | |
3107 | STps->last_block_valid = 1; | |
3108 | STps->last_block_visited = blk; | |
3109 | DEBC(printk(ST_DEB_MSG | |
3110 | "%s: Visited block %d for partition %d saved.\n", | |
3111 | name, blk, STp->partition)); | |
3112 | } | |
3113 | } | |
3114 | ||
3115 | memset(scmd, 0, MAX_COMMAND_SIZE); | |
3116 | if ((STp->device)->scsi_level < SCSI_2) { | |
3117 | scmd[0] = QFA_SEEK_BLOCK; | |
3118 | scmd[2] = (block >> 16); | |
3119 | scmd[3] = (block >> 8); | |
3120 | scmd[4] = block; | |
3121 | scmd[5] = 0; | |
3122 | } else { | |
3123 | scmd[0] = SEEK_10; | |
3124 | scmd[3] = (block >> 24); | |
3125 | scmd[4] = (block >> 16); | |
3126 | scmd[5] = (block >> 8); | |
3127 | scmd[6] = block; | |
3128 | if (!logical && !STp->scsi2_logical) | |
3129 | scmd[1] = 4; | |
3130 | if (STp->partition != partition) { | |
3131 | scmd[1] |= 2; | |
3132 | scmd[8] = partition; | |
3133 | DEBC(printk(ST_DEB_MSG | |
3134 | "%s: Trying to change partition from %d to %d\n", | |
3135 | name, STp->partition, partition)); | |
3136 | } | |
3137 | } | |
3138 | if (STp->immediate) { | |
3139 | scmd[1] |= 1; /* Don't wait for completion */ | |
a02488ed | 3140 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
3141 | } |
3142 | ||
02ae2c0e KM |
3143 | SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, |
3144 | timeout, MAX_READY_RETRIES, 1); | |
1da177e4 | 3145 | if (!SRpnt) |
02ae2c0e | 3146 | return (STp->buffer)->syscall_result; |
1da177e4 LT |
3147 | |
3148 | STps->drv_block = STps->drv_file = (-1); | |
3149 | STps->eof = ST_NOEOF; | |
3150 | if ((STp->buffer)->syscall_result != 0) { | |
3151 | result = (-EIO); | |
3152 | if (STp->can_partitions && | |
3153 | (STp->device)->scsi_level >= SCSI_2 && | |
3154 | (p = find_partition(STp)) >= 0) | |
3155 | STp->partition = p; | |
3156 | } else { | |
3157 | if (STp->can_partitions) { | |
3158 | STp->partition = partition; | |
3159 | STps = &(STp->ps[partition]); | |
3160 | if (!STps->last_block_valid || | |
3161 | STps->last_block_visited != block) { | |
3162 | STps->at_sm = 0; | |
3163 | STps->rw = ST_IDLE; | |
3164 | } | |
3165 | } else | |
3166 | STps->at_sm = 0; | |
3167 | if (block == 0) | |
3168 | STps->drv_block = STps->drv_file = 0; | |
3169 | result = 0; | |
3170 | } | |
02ae2c0e | 3171 | |
8b05b773 | 3172 | st_release_request(SRpnt); |
1da177e4 LT |
3173 | SRpnt = NULL; |
3174 | ||
3175 | return result; | |
3176 | } | |
3177 | ||
3178 | ||
3179 | /* Find the current partition number for the drive status. Called from open and | |
3180 | returns either partition number of negative error code. */ | |
3181 | static int find_partition(struct scsi_tape *STp) | |
3182 | { | |
3183 | int i, partition; | |
3184 | unsigned int block; | |
3185 | ||
3186 | if ((i = get_location(STp, &block, &partition, 1)) < 0) | |
3187 | return i; | |
3188 | if (partition >= ST_NBR_PARTITIONS) | |
3189 | return (-EIO); | |
3190 | return partition; | |
3191 | } | |
3192 | ||
3193 | ||
3194 | /* Change the partition if necessary */ | |
3195 | static int switch_partition(struct scsi_tape *STp) | |
3196 | { | |
3197 | struct st_partstat *STps; | |
3198 | ||
3199 | if (STp->partition == STp->new_partition) | |
3200 | return 0; | |
3201 | STps = &(STp->ps[STp->new_partition]); | |
3202 | if (!STps->last_block_valid) | |
3203 | STps->last_block_visited = 0; | |
3204 | return set_location(STp, STps->last_block_visited, STp->new_partition, 1); | |
3205 | } | |
3206 | \f | |
3207 | /* Functions for reading and writing the medium partition mode page. */ | |
3208 | ||
3209 | #define PART_PAGE 0x11 | |
3210 | #define PART_PAGE_FIXED_LENGTH 8 | |
3211 | ||
3212 | #define PP_OFF_MAX_ADD_PARTS 2 | |
3213 | #define PP_OFF_NBR_ADD_PARTS 3 | |
3214 | #define PP_OFF_FLAGS 4 | |
3215 | #define PP_OFF_PART_UNITS 6 | |
3216 | #define PP_OFF_RESERVED 7 | |
3217 | ||
3218 | #define PP_BIT_IDP 0x20 | |
3219 | #define PP_MSK_PSUM_MB 0x10 | |
3220 | ||
3221 | /* Get the number of partitions on the tape. As a side effect reads the | |
3222 | mode page into the tape buffer. */ | |
3223 | static int nbr_partitions(struct scsi_tape *STp) | |
3224 | { | |
3225 | int result; | |
3226 | DEB( char *name = tape_name(STp); ) | |
3227 | ||
3228 | if (STp->ready != ST_READY) | |
3229 | return (-EIO); | |
3230 | ||
3231 | result = read_mode_page(STp, PART_PAGE, 1); | |
3232 | ||
3233 | if (result) { | |
3234 | DEBC(printk(ST_DEB_MSG "%s: Can't read medium partition page.\n", | |
3235 | name)); | |
3236 | result = (-EIO); | |
3237 | } else { | |
3238 | result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + | |
3239 | PP_OFF_NBR_ADD_PARTS] + 1; | |
3240 | DEBC(printk(ST_DEB_MSG "%s: Number of partitions %d.\n", name, result)); | |
3241 | } | |
3242 | ||
3243 | return result; | |
3244 | } | |
3245 | ||
3246 | ||
3247 | /* Partition the tape into two partitions if size > 0 or one partition if | |
3248 | size == 0. | |
3249 | ||
3250 | The block descriptors are read and written because Sony SDT-7000 does not | |
3251 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). | |
3252 | ||
3253 | My HP C1533A drive returns only one partition size field. This is used to | |
3254 | set the size of partition 1. There is no size field for the default partition. | |
3255 | Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is | |
3256 | used to set the size of partition 1 (this is what the SCSI-3 standard specifies). | |
3257 | The following algorithm is used to accommodate both drives: if the number of | |
3258 | partition size fields is greater than the maximum number of additional partitions | |
3259 | in the mode page, the second field is used. Otherwise the first field is used. | |
3260 | ||
3261 | For Seagate DDS drives the page length must be 8 when no partitions is defined | |
3262 | and 10 when 1 partition is defined (information from Eric Lee Green). This is | |
3263 | is acceptable also to some other old drives and enforced if the first partition | |
3264 | size field is used for the first additional partition size. | |
3265 | */ | |
3266 | static int partition_tape(struct scsi_tape *STp, int size) | |
3267 | { | |
3268 | char *name = tape_name(STp); | |
3269 | int result; | |
3270 | int pgo, psd_cnt, psdo; | |
3271 | unsigned char *bp; | |
3272 | ||
3273 | result = read_mode_page(STp, PART_PAGE, 0); | |
3274 | if (result) { | |
3275 | DEBC(printk(ST_DEB_MSG "%s: Can't read partition mode page.\n", name)); | |
3276 | return result; | |
3277 | } | |
3278 | /* The mode page is in the buffer. Let's modify it and write it. */ | |
3279 | bp = (STp->buffer)->b_data; | |
3280 | pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; | |
3281 | DEBC(printk(ST_DEB_MSG "%s: Partition page length is %d bytes.\n", | |
3282 | name, bp[pgo + MP_OFF_PAGE_LENGTH] + 2)); | |
3283 | ||
3284 | psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; | |
3285 | psdo = pgo + PART_PAGE_FIXED_LENGTH; | |
3286 | if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) { | |
3287 | bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */ | |
3288 | psdo += 2; | |
3289 | } | |
3290 | memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); | |
3291 | ||
3292 | DEBC(printk("%s: psd_cnt %d, max.parts %d, nbr_parts %d\n", name, | |
3293 | psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], | |
3294 | bp[pgo + PP_OFF_NBR_ADD_PARTS])); | |
3295 | ||
3296 | if (size <= 0) { | |
3297 | bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; | |
3298 | if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) | |
3299 | bp[pgo + MP_OFF_PAGE_LENGTH] = 6; | |
3300 | DEBC(printk(ST_DEB_MSG "%s: Formatting tape with one partition.\n", | |
3301 | name)); | |
3302 | } else { | |
3303 | bp[psdo] = (size >> 8) & 0xff; | |
3304 | bp[psdo + 1] = size & 0xff; | |
3305 | bp[pgo + 3] = 1; | |
3306 | if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) | |
3307 | bp[pgo + MP_OFF_PAGE_LENGTH] = 8; | |
3308 | DEBC(printk(ST_DEB_MSG | |
3309 | "%s: Formatting tape with two partitions (1 = %d MB).\n", | |
3310 | name, size)); | |
3311 | } | |
3312 | bp[pgo + PP_OFF_PART_UNITS] = 0; | |
3313 | bp[pgo + PP_OFF_RESERVED] = 0; | |
3314 | bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB; | |
3315 | ||
3316 | result = write_mode_page(STp, PART_PAGE, 1); | |
3317 | if (result) { | |
3318 | printk(KERN_INFO "%s: Partitioning of tape failed.\n", name); | |
3319 | result = (-EIO); | |
3320 | } | |
3321 | ||
3322 | return result; | |
3323 | } | |
3324 | \f | |
3325 | ||
3326 | ||
3327 | /* The ioctl command */ | |
fd66c1b4 | 3328 | static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) |
1da177e4 LT |
3329 | { |
3330 | int i, cmd_nr, cmd_type, bt; | |
3331 | int retval = 0; | |
3332 | unsigned int blk; | |
3333 | struct scsi_tape *STp = file->private_data; | |
3334 | struct st_modedef *STm; | |
3335 | struct st_partstat *STps; | |
3336 | char *name = tape_name(STp); | |
3337 | void __user *p = (void __user *)arg; | |
3338 | ||
28f85009 | 3339 | if (mutex_lock_interruptible(&STp->lock)) |
1da177e4 LT |
3340 | return -ERESTARTSYS; |
3341 | ||
3342 | DEB( | |
3343 | if (debugging && !STp->in_use) { | |
3344 | printk(ST_DEB_MSG "%s: Incorrect device.\n", name); | |
3345 | retval = (-EIO); | |
3346 | goto out; | |
3347 | } ) /* end DEB */ | |
3348 | ||
3349 | STm = &(STp->modes[STp->current_mode]); | |
3350 | STps = &(STp->ps[STp->partition]); | |
3351 | ||
3352 | /* | |
3353 | * If we are in the middle of error recovery, don't let anyone | |
3354 | * else try and use this device. Also, if error recovery fails, it | |
3355 | * may try and take the device offline, in which case all further | |
3356 | * access to the device is prohibited. | |
3357 | */ | |
83ff6fe8 AV |
3358 | retval = scsi_nonblockable_ioctl(STp->device, cmd_in, p, |
3359 | file->f_flags & O_NDELAY); | |
1da177e4 LT |
3360 | if (!scsi_block_when_processing_errors(STp->device) || retval != -ENODEV) |
3361 | goto out; | |
3362 | retval = 0; | |
3363 | ||
3364 | cmd_type = _IOC_TYPE(cmd_in); | |
3365 | cmd_nr = _IOC_NR(cmd_in); | |
3366 | ||
3367 | if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { | |
3368 | struct mtop mtc; | |
3369 | ||
3370 | if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { | |
3371 | retval = (-EINVAL); | |
3372 | goto out; | |
3373 | } | |
3374 | ||
3375 | i = copy_from_user(&mtc, p, sizeof(struct mtop)); | |
3376 | if (i) { | |
3377 | retval = (-EFAULT); | |
3378 | goto out; | |
3379 | } | |
3380 | ||
3381 | if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { | |
3382 | printk(KERN_WARNING | |
3383 | "%s: MTSETDRVBUFFER only allowed for root.\n", name); | |
3384 | retval = (-EPERM); | |
3385 | goto out; | |
3386 | } | |
3387 | if (!STm->defined && | |
3388 | (mtc.mt_op != MTSETDRVBUFFER && | |
3389 | (mtc.mt_count & MT_ST_OPTIONS) == 0)) { | |
3390 | retval = (-ENXIO); | |
3391 | goto out; | |
3392 | } | |
3393 | ||
3394 | if (!STp->pos_unknown) { | |
3395 | ||
3396 | if (STps->eof == ST_FM_HIT) { | |
3397 | if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || | |
3398 | mtc.mt_op == MTEOM) { | |
3399 | mtc.mt_count -= 1; | |
3400 | if (STps->drv_file >= 0) | |
3401 | STps->drv_file += 1; | |
3402 | } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { | |
3403 | mtc.mt_count += 1; | |
3404 | if (STps->drv_file >= 0) | |
3405 | STps->drv_file += 1; | |
3406 | } | |
3407 | } | |
3408 | ||
3409 | if (mtc.mt_op == MTSEEK) { | |
3410 | /* Old position must be restored if partition will be | |
3411 | changed */ | |
3412 | i = !STp->can_partitions || | |
3413 | (STp->new_partition != STp->partition); | |
3414 | } else { | |
3415 | i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || | |
3416 | mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || | |
3417 | mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || | |
3418 | mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || | |
3419 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || | |
3420 | mtc.mt_op == MTCOMPRESSION; | |
3421 | } | |
3422 | i = flush_buffer(STp, i); | |
3423 | if (i < 0) { | |
3424 | retval = i; | |
3425 | goto out; | |
3426 | } | |
3427 | if (STps->rw == ST_WRITING && | |
3428 | (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || | |
3429 | mtc.mt_op == MTSEEK || | |
3430 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { | |
3431 | i = st_int_ioctl(STp, MTWEOF, 1); | |
3432 | if (i < 0) { | |
3433 | retval = i; | |
3434 | goto out; | |
3435 | } | |
3436 | if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) | |
3437 | mtc.mt_count++; | |
3438 | STps->rw = ST_IDLE; | |
3439 | } | |
3440 | ||
3441 | } else { | |
3442 | /* | |
3443 | * If there was a bus reset, block further access | |
3444 | * to this device. If the user wants to rewind the tape, | |
3445 | * then reset the flag and allow access again. | |
3446 | */ | |
3447 | if (mtc.mt_op != MTREW && | |
3448 | mtc.mt_op != MTOFFL && | |
3449 | mtc.mt_op != MTRETEN && | |
3450 | mtc.mt_op != MTERASE && | |
3451 | mtc.mt_op != MTSEEK && | |
3452 | mtc.mt_op != MTEOM) { | |
3453 | retval = (-EIO); | |
3454 | goto out; | |
3455 | } | |
3456 | reset_state(STp); | |
3457 | /* remove this when the midlevel properly clears was_reset */ | |
3458 | STp->device->was_reset = 0; | |
3459 | } | |
3460 | ||
3461 | if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && | |
3462 | mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && | |
3463 | mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) | |
3464 | STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ | |
3465 | ||
3466 | if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) | |
3467 | do_door_lock(STp, 0); /* Ignore result! */ | |
3468 | ||
3469 | if (mtc.mt_op == MTSETDRVBUFFER && | |
3470 | (mtc.mt_count & MT_ST_OPTIONS) != 0) { | |
3471 | retval = st_set_options(STp, mtc.mt_count); | |
3472 | goto out; | |
3473 | } | |
3474 | ||
3475 | if (mtc.mt_op == MTSETPART) { | |
3476 | if (!STp->can_partitions || | |
3477 | mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { | |
3478 | retval = (-EINVAL); | |
3479 | goto out; | |
3480 | } | |
3481 | if (mtc.mt_count >= STp->nbr_partitions && | |
3482 | (STp->nbr_partitions = nbr_partitions(STp)) < 0) { | |
3483 | retval = (-EIO); | |
3484 | goto out; | |
3485 | } | |
3486 | if (mtc.mt_count >= STp->nbr_partitions) { | |
3487 | retval = (-EINVAL); | |
3488 | goto out; | |
3489 | } | |
3490 | STp->new_partition = mtc.mt_count; | |
3491 | retval = 0; | |
3492 | goto out; | |
3493 | } | |
3494 | ||
3495 | if (mtc.mt_op == MTMKPART) { | |
3496 | if (!STp->can_partitions) { | |
3497 | retval = (-EINVAL); | |
3498 | goto out; | |
3499 | } | |
3500 | if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 || | |
3501 | (i = partition_tape(STp, mtc.mt_count)) < 0) { | |
3502 | retval = i; | |
3503 | goto out; | |
3504 | } | |
3505 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
3506 | STp->ps[i].rw = ST_IDLE; | |
3507 | STp->ps[i].at_sm = 0; | |
3508 | STp->ps[i].last_block_valid = 0; | |
3509 | } | |
3510 | STp->partition = STp->new_partition = 0; | |
3511 | STp->nbr_partitions = 1; /* Bad guess ?-) */ | |
3512 | STps->drv_block = STps->drv_file = 0; | |
3513 | retval = 0; | |
3514 | goto out; | |
3515 | } | |
3516 | ||
3517 | if (mtc.mt_op == MTSEEK) { | |
3518 | i = set_location(STp, mtc.mt_count, STp->new_partition, 0); | |
3519 | if (!STp->can_partitions) | |
3520 | STp->ps[0].rw = ST_IDLE; | |
3521 | retval = i; | |
3522 | goto out; | |
3523 | } | |
3524 | ||
3525 | if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { | |
3526 | retval = do_load_unload(STp, file, 0); | |
3527 | goto out; | |
3528 | } | |
3529 | ||
3530 | if (mtc.mt_op == MTLOAD) { | |
3531 | retval = do_load_unload(STp, file, max(1, mtc.mt_count)); | |
3532 | goto out; | |
3533 | } | |
3534 | ||
3535 | if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { | |
3536 | retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); | |
3537 | goto out; | |
3538 | } | |
3539 | ||
3540 | if (STp->can_partitions && STp->ready == ST_READY && | |
3541 | (i = switch_partition(STp)) < 0) { | |
3542 | retval = i; | |
3543 | goto out; | |
3544 | } | |
3545 | ||
3546 | if (mtc.mt_op == MTCOMPRESSION) | |
3547 | retval = st_compression(STp, (mtc.mt_count & 1)); | |
3548 | else | |
3549 | retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); | |
3550 | goto out; | |
3551 | } | |
3552 | if (!STm->defined) { | |
3553 | retval = (-ENXIO); | |
3554 | goto out; | |
3555 | } | |
3556 | ||
3557 | if ((i = flush_buffer(STp, 0)) < 0) { | |
3558 | retval = i; | |
3559 | goto out; | |
3560 | } | |
3561 | if (STp->can_partitions && | |
3562 | (i = switch_partition(STp)) < 0) { | |
3563 | retval = i; | |
3564 | goto out; | |
3565 | } | |
3566 | ||
3567 | if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { | |
3568 | struct mtget mt_status; | |
3569 | ||
3570 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { | |
3571 | retval = (-EINVAL); | |
3572 | goto out; | |
3573 | } | |
3574 | ||
3575 | mt_status.mt_type = STp->tape_type; | |
3576 | mt_status.mt_dsreg = | |
3577 | ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | | |
3578 | ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); | |
3579 | mt_status.mt_blkno = STps->drv_block; | |
3580 | mt_status.mt_fileno = STps->drv_file; | |
3581 | if (STp->block_size != 0) { | |
3582 | if (STps->rw == ST_WRITING) | |
3583 | mt_status.mt_blkno += | |
3584 | (STp->buffer)->buffer_bytes / STp->block_size; | |
3585 | else if (STps->rw == ST_READING) | |
3586 | mt_status.mt_blkno -= | |
3587 | ((STp->buffer)->buffer_bytes + | |
3588 | STp->block_size - 1) / STp->block_size; | |
3589 | } | |
3590 | ||
3591 | mt_status.mt_gstat = 0; | |
3592 | if (STp->drv_write_prot) | |
3593 | mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
3594 | if (mt_status.mt_blkno == 0) { | |
3595 | if (mt_status.mt_fileno == 0) | |
3596 | mt_status.mt_gstat |= GMT_BOT(0xffffffff); | |
3597 | else | |
3598 | mt_status.mt_gstat |= GMT_EOF(0xffffffff); | |
3599 | } | |
3600 | mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); | |
3601 | mt_status.mt_resid = STp->partition; | |
3602 | if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) | |
3603 | mt_status.mt_gstat |= GMT_EOT(0xffffffff); | |
3604 | else if (STps->eof >= ST_EOM_OK) | |
3605 | mt_status.mt_gstat |= GMT_EOD(0xffffffff); | |
3606 | if (STp->density == 1) | |
3607 | mt_status.mt_gstat |= GMT_D_800(0xffffffff); | |
3608 | else if (STp->density == 2) | |
3609 | mt_status.mt_gstat |= GMT_D_1600(0xffffffff); | |
3610 | else if (STp->density == 3) | |
3611 | mt_status.mt_gstat |= GMT_D_6250(0xffffffff); | |
3612 | if (STp->ready == ST_READY) | |
3613 | mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); | |
3614 | if (STp->ready == ST_NO_TAPE) | |
3615 | mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); | |
3616 | if (STps->at_sm) | |
3617 | mt_status.mt_gstat |= GMT_SM(0xffffffff); | |
3618 | if (STm->do_async_writes || | |
3619 | (STm->do_buffer_writes && STp->block_size != 0) || | |
3620 | STp->drv_buffer != 0) | |
3621 | mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); | |
3622 | if (STp->cleaning_req) | |
3623 | mt_status.mt_gstat |= GMT_CLN(0xffffffff); | |
3624 | ||
3625 | i = copy_to_user(p, &mt_status, sizeof(struct mtget)); | |
3626 | if (i) { | |
3627 | retval = (-EFAULT); | |
3628 | goto out; | |
3629 | } | |
3630 | ||
3631 | STp->recover_reg = 0; /* Clear after read */ | |
3632 | retval = 0; | |
3633 | goto out; | |
3634 | } /* End of MTIOCGET */ | |
3635 | if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { | |
3636 | struct mtpos mt_pos; | |
3637 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { | |
3638 | retval = (-EINVAL); | |
3639 | goto out; | |
3640 | } | |
3641 | if ((i = get_location(STp, &blk, &bt, 0)) < 0) { | |
3642 | retval = i; | |
3643 | goto out; | |
3644 | } | |
3645 | mt_pos.mt_blkno = blk; | |
3646 | i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); | |
3647 | if (i) | |
3648 | retval = (-EFAULT); | |
3649 | goto out; | |
3650 | } | |
28f85009 | 3651 | mutex_unlock(&STp->lock); |
1da177e4 LT |
3652 | switch (cmd_in) { |
3653 | case SCSI_IOCTL_GET_IDLUN: | |
3654 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
3655 | break; | |
3656 | default: | |
16c4b3e2 KM |
3657 | if ((cmd_in == SG_IO || |
3658 | cmd_in == SCSI_IOCTL_SEND_COMMAND || | |
3659 | cmd_in == CDROM_SEND_PACKET) && | |
3660 | !capable(CAP_SYS_RAWIO)) | |
1da177e4 LT |
3661 | i = -EPERM; |
3662 | else | |
74f3c8af AV |
3663 | i = scsi_cmd_ioctl(STp->disk->queue, STp->disk, |
3664 | file->f_mode, cmd_in, p); | |
1da177e4 LT |
3665 | if (i != -ENOTTY) |
3666 | return i; | |
3667 | break; | |
3668 | } | |
16c4b3e2 KM |
3669 | retval = scsi_ioctl(STp->device, cmd_in, p); |
3670 | if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */ | |
3671 | STp->rew_at_close = 0; | |
3672 | STp->ready = ST_NO_TAPE; | |
3673 | } | |
3674 | return retval; | |
1da177e4 LT |
3675 | |
3676 | out: | |
28f85009 | 3677 | mutex_unlock(&STp->lock); |
1da177e4 LT |
3678 | return retval; |
3679 | } | |
3680 | ||
3681 | #ifdef CONFIG_COMPAT | |
3682 | static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
3683 | { | |
3684 | struct scsi_tape *STp = file->private_data; | |
3685 | struct scsi_device *sdev = STp->device; | |
3686 | int ret = -ENOIOCTLCMD; | |
3687 | if (sdev->host->hostt->compat_ioctl) { | |
3688 | ||
3689 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); | |
3690 | ||
3691 | } | |
3692 | return ret; | |
3693 | } | |
3694 | #endif | |
3695 | ||
3696 | \f | |
3697 | ||
3698 | /* Try to allocate a new tape buffer. Calling function must not hold | |
3699 | dev_arr_lock. */ | |
f409d6cc | 3700 | static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) |
1da177e4 | 3701 | { |
1da177e4 LT |
3702 | struct st_buffer *tb; |
3703 | ||
f409d6cc | 3704 | tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC); |
1da177e4 LT |
3705 | if (!tb) { |
3706 | printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); | |
3707 | return NULL; | |
3708 | } | |
1ac63cf5 | 3709 | tb->frp_segs = 0; |
1da177e4 | 3710 | tb->use_sg = max_sg; |
1da177e4 | 3711 | tb->dma = need_dma; |
f409d6cc | 3712 | tb->buffer_size = 0; |
1da177e4 | 3713 | |
f409d6cc FT |
3714 | tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *), |
3715 | GFP_ATOMIC); | |
d0e1ae31 FT |
3716 | if (!tb->reserved_pages) { |
3717 | kfree(tb); | |
3718 | return NULL; | |
3719 | } | |
3720 | ||
1da177e4 LT |
3721 | return tb; |
3722 | } | |
3723 | ||
3724 | ||
3725 | /* Try to allocate enough space in the tape buffer */ | |
8f78fc5e KM |
3726 | #define ST_MAX_ORDER 6 |
3727 | ||
1da177e4 LT |
3728 | static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) |
3729 | { | |
c53033f6 AV |
3730 | int segs, nbr, max_segs, b_size, order, got; |
3731 | gfp_t priority; | |
1da177e4 LT |
3732 | |
3733 | if (new_size <= STbuffer->buffer_size) | |
3734 | return 1; | |
3735 | ||
3736 | if (STbuffer->buffer_size <= PAGE_SIZE) | |
3737 | normalize_buffer(STbuffer); /* Avoid extra segment */ | |
3738 | ||
3739 | max_segs = STbuffer->use_sg; | |
3740 | nbr = max_segs - STbuffer->frp_segs; | |
3741 | if (nbr <= 0) | |
3742 | return 0; | |
3743 | ||
3744 | priority = GFP_KERNEL | __GFP_NOWARN; | |
3745 | if (need_dma) | |
3746 | priority |= GFP_DMA; | |
9c905966 | 3747 | |
08c95832 FT |
3748 | if (STbuffer->cleared) |
3749 | priority |= __GFP_ZERO; | |
3750 | ||
9c905966 | 3751 | if (STbuffer->frp_segs) { |
c982c368 | 3752 | order = STbuffer->reserved_page_order; |
08c95832 | 3753 | b_size = PAGE_SIZE << order; |
9c905966 FT |
3754 | } else { |
3755 | for (b_size = PAGE_SIZE, order = 0; | |
46081b16 FT |
3756 | order < ST_MAX_ORDER && |
3757 | max_segs * (PAGE_SIZE << order) < new_size; | |
8f78fc5e | 3758 | order++, b_size *= 2) |
9c905966 | 3759 | ; /* empty */ |
373daacf | 3760 | STbuffer->reserved_page_order = order; |
9c905966 | 3761 | } |
8f78fc5e KM |
3762 | if (max_segs * (PAGE_SIZE << order) < new_size) { |
3763 | if (order == ST_MAX_ORDER) | |
3764 | return 0; | |
3765 | normalize_buffer(STbuffer); | |
3766 | return enlarge_buffer(STbuffer, new_size, need_dma); | |
3767 | } | |
1da177e4 LT |
3768 | |
3769 | for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; | |
3770 | segs < max_segs && got < new_size;) { | |
08c95832 FT |
3771 | struct page *page; |
3772 | ||
3773 | page = alloc_pages(priority, order); | |
3774 | if (!page) { | |
1da177e4 LT |
3775 | DEB(STbuffer->buffer_size = got); |
3776 | normalize_buffer(STbuffer); | |
3777 | return 0; | |
3778 | } | |
08c95832 | 3779 | |
1da177e4 LT |
3780 | STbuffer->frp_segs += 1; |
3781 | got += b_size; | |
3782 | STbuffer->buffer_size = got; | |
08c95832 | 3783 | STbuffer->reserved_pages[segs] = page; |
1da177e4 LT |
3784 | segs++; |
3785 | } | |
08c95832 | 3786 | STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); |
1da177e4 LT |
3787 | |
3788 | return 1; | |
3789 | } | |
3790 | ||
3791 | ||
40f6b36c KM |
3792 | /* Make sure that no data from previous user is in the internal buffer */ |
3793 | static void clear_buffer(struct st_buffer * st_bp) | |
3794 | { | |
3795 | int i; | |
3796 | ||
3797 | for (i=0; i < st_bp->frp_segs; i++) | |
08c95832 | 3798 | memset(page_address(st_bp->reserved_pages[i]), 0, |
c982c368 | 3799 | PAGE_SIZE << st_bp->reserved_page_order); |
40f6b36c KM |
3800 | st_bp->cleared = 1; |
3801 | } | |
3802 | ||
3803 | ||
1da177e4 LT |
3804 | /* Release the extra buffer */ |
3805 | static void normalize_buffer(struct st_buffer * STbuffer) | |
3806 | { | |
c982c368 | 3807 | int i, order = STbuffer->reserved_page_order; |
1da177e4 | 3808 | |
1ac63cf5 | 3809 | for (i = 0; i < STbuffer->frp_segs; i++) { |
08c95832 FT |
3810 | __free_pages(STbuffer->reserved_pages[i], order); |
3811 | STbuffer->buffer_size -= (PAGE_SIZE << order); | |
1da177e4 | 3812 | } |
1ac63cf5 | 3813 | STbuffer->frp_segs = 0; |
8b05b773 | 3814 | STbuffer->sg_segs = 0; |
c982c368 | 3815 | STbuffer->reserved_page_order = 0; |
d0e1ae31 | 3816 | STbuffer->map_data.offset = 0; |
1da177e4 LT |
3817 | } |
3818 | ||
3819 | ||
3820 | /* Move data from the user buffer to the tape buffer. Returns zero (success) or | |
3821 | negative error code. */ | |
3822 | static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) | |
3823 | { | |
3824 | int i, cnt, res, offset; | |
c982c368 | 3825 | int length = PAGE_SIZE << st_bp->reserved_page_order; |
1da177e4 LT |
3826 | |
3827 | for (i = 0, offset = st_bp->buffer_bytes; | |
08c95832 FT |
3828 | i < st_bp->frp_segs && offset >= length; i++) |
3829 | offset -= length; | |
1da177e4 LT |
3830 | if (i == st_bp->frp_segs) { /* Should never happen */ |
3831 | printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); | |
3832 | return (-EIO); | |
3833 | } | |
3834 | for (; i < st_bp->frp_segs && do_count > 0; i++) { | |
08c95832 FT |
3835 | struct page *page = st_bp->reserved_pages[i]; |
3836 | cnt = length - offset < do_count ? length - offset : do_count; | |
3837 | res = copy_from_user(page_address(page) + offset, ubp, cnt); | |
1da177e4 LT |
3838 | if (res) |
3839 | return (-EFAULT); | |
3840 | do_count -= cnt; | |
3841 | st_bp->buffer_bytes += cnt; | |
3842 | ubp += cnt; | |
3843 | offset = 0; | |
3844 | } | |
3845 | if (do_count) /* Should never happen */ | |
3846 | return (-EIO); | |
3847 | ||
3848 | return 0; | |
3849 | } | |
3850 | ||
3851 | ||
3852 | /* Move data from the tape buffer to the user buffer. Returns zero (success) or | |
3853 | negative error code. */ | |
3854 | static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) | |
3855 | { | |
3856 | int i, cnt, res, offset; | |
c982c368 | 3857 | int length = PAGE_SIZE << st_bp->reserved_page_order; |
1da177e4 LT |
3858 | |
3859 | for (i = 0, offset = st_bp->read_pointer; | |
08c95832 FT |
3860 | i < st_bp->frp_segs && offset >= length; i++) |
3861 | offset -= length; | |
1da177e4 LT |
3862 | if (i == st_bp->frp_segs) { /* Should never happen */ |
3863 | printk(KERN_WARNING "st: from_buffer offset overflow.\n"); | |
3864 | return (-EIO); | |
3865 | } | |
3866 | for (; i < st_bp->frp_segs && do_count > 0; i++) { | |
08c95832 FT |
3867 | struct page *page = st_bp->reserved_pages[i]; |
3868 | cnt = length - offset < do_count ? length - offset : do_count; | |
3869 | res = copy_to_user(ubp, page_address(page) + offset, cnt); | |
1da177e4 LT |
3870 | if (res) |
3871 | return (-EFAULT); | |
3872 | do_count -= cnt; | |
3873 | st_bp->buffer_bytes -= cnt; | |
3874 | st_bp->read_pointer += cnt; | |
3875 | ubp += cnt; | |
3876 | offset = 0; | |
3877 | } | |
3878 | if (do_count) /* Should never happen */ | |
3879 | return (-EIO); | |
3880 | ||
3881 | return 0; | |
3882 | } | |
3883 | ||
3884 | ||
3885 | /* Move data towards start of buffer */ | |
3886 | static void move_buffer_data(struct st_buffer * st_bp, int offset) | |
3887 | { | |
3888 | int src_seg, dst_seg, src_offset = 0, dst_offset; | |
3889 | int count, total; | |
c982c368 | 3890 | int length = PAGE_SIZE << st_bp->reserved_page_order; |
1da177e4 LT |
3891 | |
3892 | if (offset == 0) | |
3893 | return; | |
3894 | ||
3895 | total=st_bp->buffer_bytes - offset; | |
3896 | for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { | |
3897 | src_offset = offset; | |
08c95832 | 3898 | if (src_offset < length) |
1da177e4 | 3899 | break; |
08c95832 | 3900 | offset -= length; |
1da177e4 LT |
3901 | } |
3902 | ||
3903 | st_bp->buffer_bytes = st_bp->read_pointer = total; | |
3904 | for (dst_seg=dst_offset=0; total > 0; ) { | |
08c95832 FT |
3905 | struct page *dpage = st_bp->reserved_pages[dst_seg]; |
3906 | struct page *spage = st_bp->reserved_pages[src_seg]; | |
3907 | ||
3908 | count = min(length - dst_offset, length - src_offset); | |
3909 | memmove(page_address(dpage) + dst_offset, | |
3910 | page_address(spage) + src_offset, count); | |
1da177e4 | 3911 | src_offset += count; |
08c95832 | 3912 | if (src_offset >= length) { |
1da177e4 LT |
3913 | src_seg++; |
3914 | src_offset = 0; | |
3915 | } | |
3916 | dst_offset += count; | |
08c95832 | 3917 | if (dst_offset >= length) { |
1da177e4 LT |
3918 | dst_seg++; |
3919 | dst_offset = 0; | |
3920 | } | |
3921 | total -= count; | |
3922 | } | |
3923 | } | |
3924 | ||
1da177e4 LT |
3925 | /* Validate the options from command line or module parameters */ |
3926 | static void validate_options(void) | |
3927 | { | |
3928 | if (buffer_kbs > 0) | |
3929 | st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; | |
3930 | if (max_sg_segs >= ST_FIRST_SG) | |
3931 | st_max_sg_segs = max_sg_segs; | |
3932 | } | |
3933 | ||
3934 | #ifndef MODULE | |
3935 | /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. | |
3936 | */ | |
3937 | static int __init st_setup(char *str) | |
3938 | { | |
3939 | int i, len, ints[5]; | |
3940 | char *stp; | |
3941 | ||
3942 | stp = get_options(str, ARRAY_SIZE(ints), ints); | |
3943 | ||
3944 | if (ints[0] > 0) { | |
3945 | for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) | |
3946 | if (parms[i].val) | |
3947 | *parms[i].val = ints[i + 1]; | |
3948 | } else { | |
3949 | while (stp != NULL) { | |
3950 | for (i = 0; i < ARRAY_SIZE(parms); i++) { | |
3951 | len = strlen(parms[i].name); | |
3952 | if (!strncmp(stp, parms[i].name, len) && | |
3953 | (*(stp + len) == ':' || *(stp + len) == '=')) { | |
3954 | if (parms[i].val) | |
3955 | *parms[i].val = | |
3956 | simple_strtoul(stp + len + 1, NULL, 0); | |
3957 | else | |
3958 | printk(KERN_WARNING "st: Obsolete parameter %s\n", | |
3959 | parms[i].name); | |
3960 | break; | |
3961 | } | |
3962 | } | |
6391a113 | 3963 | if (i >= ARRAY_SIZE(parms)) |
1da177e4 LT |
3964 | printk(KERN_WARNING "st: invalid parameter in '%s'\n", |
3965 | stp); | |
3966 | stp = strchr(stp, ','); | |
3967 | if (stp) | |
3968 | stp++; | |
3969 | } | |
3970 | } | |
3971 | ||
3972 | validate_options(); | |
3973 | ||
3974 | return 1; | |
3975 | } | |
3976 | ||
3977 | __setup("st=", st_setup); | |
3978 | ||
3979 | #endif | |
3980 | ||
00977a59 | 3981 | static const struct file_operations st_fops = |
1da177e4 LT |
3982 | { |
3983 | .owner = THIS_MODULE, | |
3984 | .read = st_read, | |
3985 | .write = st_write, | |
fd66c1b4 | 3986 | .unlocked_ioctl = st_ioctl, |
1da177e4 LT |
3987 | #ifdef CONFIG_COMPAT |
3988 | .compat_ioctl = st_compat_ioctl, | |
3989 | #endif | |
3990 | .open = st_open, | |
3991 | .flush = st_flush, | |
3992 | .release = st_release, | |
b4d878e2 | 3993 | .llseek = noop_llseek, |
1da177e4 LT |
3994 | }; |
3995 | ||
3996 | static int st_probe(struct device *dev) | |
3997 | { | |
3998 | struct scsi_device *SDp = to_scsi_device(dev); | |
3999 | struct gendisk *disk = NULL; | |
4000 | struct cdev *cdev = NULL; | |
4001 | struct scsi_tape *tpnt = NULL; | |
4002 | struct st_modedef *STm; | |
4003 | struct st_partstat *STps; | |
4004 | struct st_buffer *buffer; | |
4005 | int i, j, mode, dev_num, error; | |
4006 | char *stp; | |
1da177e4 LT |
4007 | |
4008 | if (SDp->type != TYPE_TAPE) | |
4009 | return -ENODEV; | |
4010 | if ((stp = st_incompatible(SDp))) { | |
3bf743e7 | 4011 | sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n"); |
1da177e4 LT |
4012 | printk(KERN_INFO "st: The suggested driver is %s.\n", stp); |
4013 | return -ENODEV; | |
4014 | } | |
4015 | ||
8a78362c | 4016 | i = queue_max_segments(SDp->request_queue); |
1da177e4 LT |
4017 | if (st_max_sg_segs < i) |
4018 | i = st_max_sg_segs; | |
f409d6cc | 4019 | buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i); |
1da177e4 LT |
4020 | if (buffer == NULL) { |
4021 | printk(KERN_ERR | |
4022 | "st: Can't allocate new tape buffer. Device not attached.\n"); | |
4023 | goto out; | |
4024 | } | |
4025 | ||
4026 | disk = alloc_disk(1); | |
4027 | if (!disk) { | |
4028 | printk(KERN_ERR "st: out of memory. Device not attached.\n"); | |
4029 | goto out_buffer_free; | |
4030 | } | |
4031 | ||
4032 | write_lock(&st_dev_arr_lock); | |
4033 | if (st_nr_dev >= st_dev_max) { | |
4034 | struct scsi_tape **tmp_da; | |
4035 | int tmp_dev_max; | |
4036 | ||
4037 | tmp_dev_max = max(st_nr_dev * 2, 8); | |
4038 | if (tmp_dev_max > ST_MAX_TAPES) | |
4039 | tmp_dev_max = ST_MAX_TAPES; | |
4040 | if (tmp_dev_max <= st_nr_dev) { | |
4041 | write_unlock(&st_dev_arr_lock); | |
4042 | printk(KERN_ERR "st: Too many tape devices (max. %d).\n", | |
4043 | ST_MAX_TAPES); | |
4044 | goto out_put_disk; | |
4045 | } | |
4046 | ||
24669f75 | 4047 | tmp_da = kzalloc(tmp_dev_max * sizeof(struct scsi_tape *), GFP_ATOMIC); |
1da177e4 LT |
4048 | if (tmp_da == NULL) { |
4049 | write_unlock(&st_dev_arr_lock); | |
4050 | printk(KERN_ERR "st: Can't extend device array.\n"); | |
4051 | goto out_put_disk; | |
4052 | } | |
4053 | ||
1da177e4 LT |
4054 | if (scsi_tapes != NULL) { |
4055 | memcpy(tmp_da, scsi_tapes, | |
4056 | st_dev_max * sizeof(struct scsi_tape *)); | |
4057 | kfree(scsi_tapes); | |
4058 | } | |
4059 | scsi_tapes = tmp_da; | |
4060 | ||
4061 | st_dev_max = tmp_dev_max; | |
4062 | } | |
4063 | ||
4064 | for (i = 0; i < st_dev_max; i++) | |
4065 | if (scsi_tapes[i] == NULL) | |
4066 | break; | |
4067 | if (i >= st_dev_max) | |
4068 | panic("scsi_devices corrupt (st)"); | |
4069 | ||
24669f75 | 4070 | tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC); |
1da177e4 LT |
4071 | if (tpnt == NULL) { |
4072 | write_unlock(&st_dev_arr_lock); | |
4073 | printk(KERN_ERR "st: Can't allocate device descriptor.\n"); | |
4074 | goto out_put_disk; | |
4075 | } | |
f03a5670 | 4076 | kref_init(&tpnt->kref); |
1da177e4 LT |
4077 | tpnt->disk = disk; |
4078 | sprintf(disk->disk_name, "st%d", i); | |
4079 | disk->private_data = &tpnt->driver; | |
4080 | disk->queue = SDp->request_queue; | |
4081 | tpnt->driver = &st_template; | |
4082 | scsi_tapes[i] = tpnt; | |
4083 | dev_num = i; | |
4084 | ||
4085 | tpnt->device = SDp; | |
4086 | if (SDp->scsi_level <= 2) | |
4087 | tpnt->tape_type = MT_ISSCSI1; | |
4088 | else | |
4089 | tpnt->tape_type = MT_ISSCSI2; | |
4090 | ||
4091 | tpnt->buffer = buffer; | |
f03a5670 | 4092 | tpnt->buffer->last_SRpnt = NULL; |
1da177e4 LT |
4093 | |
4094 | tpnt->inited = 0; | |
4095 | tpnt->dirty = 0; | |
4096 | tpnt->in_use = 0; | |
4097 | tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ | |
4098 | tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; | |
4099 | tpnt->use_pf = (SDp->scsi_level >= SCSI_2); | |
4100 | tpnt->density = 0; | |
4101 | tpnt->do_auto_lock = ST_AUTO_LOCK; | |
4102 | tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ | |
4103 | tpnt->can_partitions = 0; | |
4104 | tpnt->two_fm = ST_TWO_FM; | |
4105 | tpnt->fast_mteom = ST_FAST_MTEOM; | |
4106 | tpnt->scsi2_logical = ST_SCSI2LOGICAL; | |
40f6b36c | 4107 | tpnt->sili = ST_SILI; |
1da177e4 | 4108 | tpnt->immediate = ST_NOWAIT; |
c743e44f | 4109 | tpnt->immediate_filemark = 0; |
1da177e4 LT |
4110 | tpnt->default_drvbuffer = 0xff; /* No forced buffering */ |
4111 | tpnt->partition = 0; | |
4112 | tpnt->new_partition = 0; | |
4113 | tpnt->nbr_partitions = 0; | |
a02488ed | 4114 | blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT); |
1da177e4 LT |
4115 | tpnt->long_timeout = ST_LONG_TIMEOUT; |
4116 | tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; | |
4117 | ||
1da177e4 LT |
4118 | for (i = 0; i < ST_NBR_MODES; i++) { |
4119 | STm = &(tpnt->modes[i]); | |
4120 | STm->defined = 0; | |
4121 | STm->sysv = ST_SYSV; | |
4122 | STm->defaults_for_writes = 0; | |
4123 | STm->do_async_writes = ST_ASYNC_WRITES; | |
4124 | STm->do_buffer_writes = ST_BUFFER_WRITES; | |
4125 | STm->do_read_ahead = ST_READ_AHEAD; | |
4126 | STm->default_compression = ST_DONT_TOUCH; | |
4127 | STm->default_blksize = (-1); /* No forced size */ | |
4128 | STm->default_density = (-1); /* No forced density */ | |
4129 | } | |
4130 | ||
4131 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
4132 | STps = &(tpnt->ps[i]); | |
4133 | STps->rw = ST_IDLE; | |
4134 | STps->eof = ST_NOEOF; | |
4135 | STps->at_sm = 0; | |
4136 | STps->last_block_valid = 0; | |
4137 | STps->drv_block = (-1); | |
4138 | STps->drv_file = (-1); | |
4139 | } | |
4140 | ||
4141 | tpnt->current_mode = 0; | |
4142 | tpnt->modes[0].defined = 1; | |
4143 | ||
4144 | tpnt->density_changed = tpnt->compression_changed = | |
4145 | tpnt->blksize_changed = 0; | |
28f85009 | 4146 | mutex_init(&tpnt->lock); |
1da177e4 LT |
4147 | |
4148 | st_nr_dev++; | |
4149 | write_unlock(&st_dev_arr_lock); | |
4150 | ||
4151 | for (mode = 0; mode < ST_NBR_MODES; ++mode) { | |
4152 | STm = &(tpnt->modes[mode]); | |
4153 | for (j=0; j < 2; j++) { | |
4154 | cdev = cdev_alloc(); | |
4155 | if (!cdev) { | |
4156 | printk(KERN_ERR | |
4157 | "st%d: out of memory. Device not attached.\n", | |
4158 | dev_num); | |
e3f2a9cc | 4159 | cdev_del(cdev); |
1da177e4 LT |
4160 | goto out_free_tape; |
4161 | } | |
4162 | cdev->owner = THIS_MODULE; | |
4163 | cdev->ops = &st_fops; | |
4164 | ||
4165 | error = cdev_add(cdev, | |
4166 | MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, j)), | |
4167 | 1); | |
4168 | if (error) { | |
4169 | printk(KERN_ERR "st%d: Can't add %s-rewind mode %d\n", | |
4170 | dev_num, j ? "non" : "auto", mode); | |
4171 | printk(KERN_ERR "st%d: Device not attached.\n", dev_num); | |
4172 | goto out_free_tape; | |
4173 | } | |
4174 | STm->cdevs[j] = cdev; | |
4175 | ||
4176 | } | |
13026a6b JG |
4177 | error = do_create_class_files(tpnt, dev_num, mode); |
4178 | if (error) | |
4179 | goto out_free_tape; | |
1da177e4 | 4180 | } |
46a243f7 | 4181 | scsi_autopm_put_device(SDp); |
1da177e4 | 4182 | |
42252854 | 4183 | sdev_printk(KERN_NOTICE, SDp, |
8b1ea24c | 4184 | "Attached scsi tape %s\n", tape_name(tpnt)); |
42252854 KM |
4185 | sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n", |
4186 | tape_name(tpnt), tpnt->try_dio ? "yes" : "no", | |
4187 | queue_dma_alignment(SDp->request_queue) + 1); | |
1da177e4 LT |
4188 | |
4189 | return 0; | |
4190 | ||
4191 | out_free_tape: | |
4192 | for (mode=0; mode < ST_NBR_MODES; mode++) { | |
4193 | STm = &(tpnt->modes[mode]); | |
4194 | sysfs_remove_link(&tpnt->device->sdev_gendev.kobj, | |
4195 | "tape"); | |
4196 | for (j=0; j < 2; j++) { | |
4197 | if (STm->cdevs[j]) { | |
e3f2a9cc JM |
4198 | device_destroy(&st_sysfs_class, |
4199 | MKDEV(SCSI_TAPE_MAJOR, | |
4200 | TAPE_MINOR(i, mode, j))); | |
1da177e4 LT |
4201 | cdev_del(STm->cdevs[j]); |
4202 | } | |
4203 | } | |
4204 | } | |
1da177e4 LT |
4205 | write_lock(&st_dev_arr_lock); |
4206 | scsi_tapes[dev_num] = NULL; | |
4207 | st_nr_dev--; | |
4208 | write_unlock(&st_dev_arr_lock); | |
4209 | out_put_disk: | |
4210 | put_disk(disk); | |
c9475cb0 | 4211 | kfree(tpnt); |
1da177e4 LT |
4212 | out_buffer_free: |
4213 | kfree(buffer); | |
4214 | out: | |
4215 | return -ENODEV; | |
4216 | }; | |
4217 | ||
4218 | ||
4219 | static int st_remove(struct device *dev) | |
4220 | { | |
4221 | struct scsi_device *SDp = to_scsi_device(dev); | |
4222 | struct scsi_tape *tpnt; | |
4223 | int i, j, mode; | |
4224 | ||
46a243f7 | 4225 | scsi_autopm_get_device(SDp); |
1da177e4 LT |
4226 | write_lock(&st_dev_arr_lock); |
4227 | for (i = 0; i < st_dev_max; i++) { | |
4228 | tpnt = scsi_tapes[i]; | |
4229 | if (tpnt != NULL && tpnt->device == SDp) { | |
4230 | scsi_tapes[i] = NULL; | |
4231 | st_nr_dev--; | |
4232 | write_unlock(&st_dev_arr_lock); | |
1da177e4 LT |
4233 | sysfs_remove_link(&tpnt->device->sdev_gendev.kobj, |
4234 | "tape"); | |
4235 | for (mode = 0; mode < ST_NBR_MODES; ++mode) { | |
1da177e4 | 4236 | for (j=0; j < 2; j++) { |
af23782b | 4237 | device_destroy(&st_sysfs_class, |
ee959b00 TJ |
4238 | MKDEV(SCSI_TAPE_MAJOR, |
4239 | TAPE_MINOR(i, mode, j))); | |
1da177e4 LT |
4240 | cdev_del(tpnt->modes[mode].cdevs[j]); |
4241 | tpnt->modes[mode].cdevs[j] = NULL; | |
4242 | } | |
4243 | } | |
1da177e4 | 4244 | |
0b950672 | 4245 | mutex_lock(&st_ref_mutex); |
f03a5670 | 4246 | kref_put(&tpnt->kref, scsi_tape_release); |
0b950672 | 4247 | mutex_unlock(&st_ref_mutex); |
1da177e4 LT |
4248 | return 0; |
4249 | } | |
4250 | } | |
4251 | ||
4252 | write_unlock(&st_dev_arr_lock); | |
4253 | return 0; | |
4254 | } | |
4255 | ||
f03a5670 KM |
4256 | /** |
4257 | * scsi_tape_release - Called to free the Scsi_Tape structure | |
4258 | * @kref: pointer to embedded kref | |
4259 | * | |
0b950672 | 4260 | * st_ref_mutex must be held entering this routine. Because it is |
f03a5670 KM |
4261 | * called on last put, you should always use the scsi_tape_get() |
4262 | * scsi_tape_put() helpers which manipulate the semaphore directly | |
4263 | * and never do a direct kref_put(). | |
4264 | **/ | |
4265 | static void scsi_tape_release(struct kref *kref) | |
4266 | { | |
4267 | struct scsi_tape *tpnt = to_scsi_tape(kref); | |
4268 | struct gendisk *disk = tpnt->disk; | |
4269 | ||
4270 | tpnt->device = NULL; | |
4271 | ||
4272 | if (tpnt->buffer) { | |
f03a5670 | 4273 | normalize_buffer(tpnt->buffer); |
d0e1ae31 | 4274 | kfree(tpnt->buffer->reserved_pages); |
f03a5670 KM |
4275 | kfree(tpnt->buffer); |
4276 | } | |
4277 | ||
4278 | disk->private_data = NULL; | |
4279 | put_disk(disk); | |
4280 | kfree(tpnt); | |
4281 | return; | |
4282 | } | |
4283 | ||
af23782b JM |
4284 | static struct class st_sysfs_class = { |
4285 | .name = "scsi_tape", | |
4286 | .dev_attrs = st_dev_attrs, | |
4287 | }; | |
4288 | ||
1da177e4 LT |
4289 | static int __init init_st(void) |
4290 | { | |
13026a6b JG |
4291 | int err; |
4292 | ||
1da177e4 LT |
4293 | validate_options(); |
4294 | ||
13026a6b | 4295 | printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n", |
1da177e4 LT |
4296 | verstr, st_fixed_buffer_size, st_max_sg_segs); |
4297 | ||
af23782b JM |
4298 | err = class_register(&st_sysfs_class); |
4299 | if (err) { | |
4300 | pr_err("Unable register sysfs class for SCSI tapes\n"); | |
4301 | return err; | |
1da177e4 LT |
4302 | } |
4303 | ||
13026a6b JG |
4304 | err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), |
4305 | ST_MAX_TAPE_ENTRIES, "st"); | |
4306 | if (err) { | |
4307 | printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", | |
4308 | SCSI_TAPE_MAJOR); | |
4309 | goto err_class; | |
1da177e4 LT |
4310 | } |
4311 | ||
13026a6b JG |
4312 | err = scsi_register_driver(&st_template.gendrv); |
4313 | if (err) | |
4314 | goto err_chrdev; | |
4315 | ||
405ae7d3 | 4316 | err = do_create_sysfs_files(); |
13026a6b JG |
4317 | if (err) |
4318 | goto err_scsidrv; | |
4319 | ||
4320 | return 0; | |
4321 | ||
4322 | err_scsidrv: | |
4323 | scsi_unregister_driver(&st_template.gendrv); | |
4324 | err_chrdev: | |
4325 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), | |
4326 | ST_MAX_TAPE_ENTRIES); | |
4327 | err_class: | |
af23782b | 4328 | class_unregister(&st_sysfs_class); |
13026a6b | 4329 | return err; |
1da177e4 LT |
4330 | } |
4331 | ||
4332 | static void __exit exit_st(void) | |
4333 | { | |
405ae7d3 | 4334 | do_remove_sysfs_files(); |
1da177e4 LT |
4335 | scsi_unregister_driver(&st_template.gendrv); |
4336 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), | |
4337 | ST_MAX_TAPE_ENTRIES); | |
af23782b | 4338 | class_unregister(&st_sysfs_class); |
1da177e4 LT |
4339 | kfree(scsi_tapes); |
4340 | printk(KERN_INFO "st: Unloaded.\n"); | |
4341 | } | |
4342 | ||
4343 | module_init(init_st); | |
4344 | module_exit(exit_st); | |
4345 | ||
4346 | ||
4347 | /* The sysfs driver interface. Read-only at the moment */ | |
4348 | static ssize_t st_try_direct_io_show(struct device_driver *ddp, char *buf) | |
4349 | { | |
4350 | return snprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); | |
4351 | } | |
4352 | static DRIVER_ATTR(try_direct_io, S_IRUGO, st_try_direct_io_show, NULL); | |
4353 | ||
4354 | static ssize_t st_fixed_buffer_size_show(struct device_driver *ddp, char *buf) | |
4355 | { | |
4356 | return snprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); | |
4357 | } | |
4358 | static DRIVER_ATTR(fixed_buffer_size, S_IRUGO, st_fixed_buffer_size_show, NULL); | |
4359 | ||
4360 | static ssize_t st_max_sg_segs_show(struct device_driver *ddp, char *buf) | |
4361 | { | |
4362 | return snprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); | |
4363 | } | |
4364 | static DRIVER_ATTR(max_sg_segs, S_IRUGO, st_max_sg_segs_show, NULL); | |
4365 | ||
4366 | static ssize_t st_version_show(struct device_driver *ddd, char *buf) | |
4367 | { | |
4368 | return snprintf(buf, PAGE_SIZE, "[%s]\n", verstr); | |
4369 | } | |
4370 | static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL); | |
4371 | ||
405ae7d3 | 4372 | static int do_create_sysfs_files(void) |
1da177e4 | 4373 | { |
405ae7d3 | 4374 | struct device_driver *sysfs = &st_template.gendrv; |
13026a6b JG |
4375 | int err; |
4376 | ||
405ae7d3 | 4377 | err = driver_create_file(sysfs, &driver_attr_try_direct_io); |
13026a6b JG |
4378 | if (err) |
4379 | return err; | |
405ae7d3 | 4380 | err = driver_create_file(sysfs, &driver_attr_fixed_buffer_size); |
13026a6b JG |
4381 | if (err) |
4382 | goto err_try_direct_io; | |
405ae7d3 | 4383 | err = driver_create_file(sysfs, &driver_attr_max_sg_segs); |
13026a6b JG |
4384 | if (err) |
4385 | goto err_attr_fixed_buf; | |
405ae7d3 | 4386 | err = driver_create_file(sysfs, &driver_attr_version); |
13026a6b JG |
4387 | if (err) |
4388 | goto err_attr_max_sg; | |
1da177e4 | 4389 | |
13026a6b JG |
4390 | return 0; |
4391 | ||
4392 | err_attr_max_sg: | |
405ae7d3 | 4393 | driver_remove_file(sysfs, &driver_attr_max_sg_segs); |
13026a6b | 4394 | err_attr_fixed_buf: |
405ae7d3 | 4395 | driver_remove_file(sysfs, &driver_attr_fixed_buffer_size); |
13026a6b | 4396 | err_try_direct_io: |
405ae7d3 | 4397 | driver_remove_file(sysfs, &driver_attr_try_direct_io); |
13026a6b | 4398 | return err; |
1da177e4 LT |
4399 | } |
4400 | ||
405ae7d3 | 4401 | static void do_remove_sysfs_files(void) |
1da177e4 | 4402 | { |
405ae7d3 | 4403 | struct device_driver *sysfs = &st_template.gendrv; |
1da177e4 | 4404 | |
405ae7d3 RD |
4405 | driver_remove_file(sysfs, &driver_attr_version); |
4406 | driver_remove_file(sysfs, &driver_attr_max_sg_segs); | |
4407 | driver_remove_file(sysfs, &driver_attr_fixed_buffer_size); | |
4408 | driver_remove_file(sysfs, &driver_attr_try_direct_io); | |
1da177e4 LT |
4409 | } |
4410 | ||
1da177e4 | 4411 | /* The sysfs simple class interface */ |
ee959b00 | 4412 | static ssize_t |
af23782b | 4413 | defined_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 4414 | { |
7d15d6a4 | 4415 | struct st_modedef *STm = dev_get_drvdata(dev); |
1da177e4 LT |
4416 | ssize_t l = 0; |
4417 | ||
4418 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); | |
4419 | return l; | |
4420 | } | |
4421 | ||
ee959b00 | 4422 | static ssize_t |
af23782b JM |
4423 | default_blksize_show(struct device *dev, struct device_attribute *attr, |
4424 | char *buf) | |
1da177e4 | 4425 | { |
7d15d6a4 | 4426 | struct st_modedef *STm = dev_get_drvdata(dev); |
1da177e4 LT |
4427 | ssize_t l = 0; |
4428 | ||
4429 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); | |
4430 | return l; | |
4431 | } | |
4432 | ||
1da177e4 | 4433 | |
ee959b00 | 4434 | static ssize_t |
af23782b JM |
4435 | default_density_show(struct device *dev, struct device_attribute *attr, |
4436 | char *buf) | |
1da177e4 | 4437 | { |
7d15d6a4 | 4438 | struct st_modedef *STm = dev_get_drvdata(dev); |
1da177e4 LT |
4439 | ssize_t l = 0; |
4440 | char *fmt; | |
4441 | ||
4442 | fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; | |
4443 | l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); | |
4444 | return l; | |
4445 | } | |
4446 | ||
ee959b00 | 4447 | static ssize_t |
af23782b JM |
4448 | default_compression_show(struct device *dev, struct device_attribute *attr, |
4449 | char *buf) | |
1da177e4 | 4450 | { |
7d15d6a4 | 4451 | struct st_modedef *STm = dev_get_drvdata(dev); |
1da177e4 LT |
4452 | ssize_t l = 0; |
4453 | ||
4454 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); | |
4455 | return l; | |
4456 | } | |
4457 | ||
ee959b00 | 4458 | static ssize_t |
af23782b | 4459 | options_show(struct device *dev, struct device_attribute *attr, char *buf) |
b174be02 | 4460 | { |
7d15d6a4 | 4461 | struct st_modedef *STm = dev_get_drvdata(dev); |
b174be02 KM |
4462 | struct scsi_tape *STp; |
4463 | int i, j, options; | |
4464 | ssize_t l = 0; | |
4465 | ||
4466 | for (i=0; i < st_dev_max; i++) { | |
4467 | for (j=0; j < ST_NBR_MODES; j++) | |
4468 | if (&scsi_tapes[i]->modes[j] == STm) | |
4469 | break; | |
4470 | if (j < ST_NBR_MODES) | |
4471 | break; | |
4472 | } | |
4473 | if (i == st_dev_max) | |
4474 | return 0; /* should never happen */ | |
4475 | ||
4476 | STp = scsi_tapes[i]; | |
4477 | ||
4478 | options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; | |
4479 | options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; | |
4480 | options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; | |
4481 | DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); | |
4482 | options |= STp->two_fm ? MT_ST_TWO_FM : 0; | |
4483 | options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; | |
4484 | options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; | |
4485 | options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; | |
4486 | options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; | |
4487 | options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; | |
4488 | options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; | |
4489 | options |= STm->sysv ? MT_ST_SYSV : 0; | |
4490 | options |= STp->immediate ? MT_ST_NOWAIT : 0; | |
c743e44f | 4491 | options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0; |
b174be02 KM |
4492 | options |= STp->sili ? MT_ST_SILI : 0; |
4493 | ||
4494 | l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); | |
4495 | return l; | |
4496 | } | |
4497 | ||
af23782b JM |
4498 | static struct device_attribute st_dev_attrs[] = { |
4499 | __ATTR_RO(defined), | |
4500 | __ATTR_RO(default_blksize), | |
4501 | __ATTR_RO(default_density), | |
4502 | __ATTR_RO(default_compression), | |
4503 | __ATTR_RO(options), | |
4504 | __ATTR_NULL, | |
4505 | }; | |
b174be02 | 4506 | |
13026a6b | 4507 | static int do_create_class_files(struct scsi_tape *STp, int dev_num, int mode) |
1da177e4 LT |
4508 | { |
4509 | int i, rew, error; | |
4510 | char name[10]; | |
ee959b00 | 4511 | struct device *st_class_member; |
1da177e4 | 4512 | |
1da177e4 LT |
4513 | for (rew=0; rew < 2; rew++) { |
4514 | /* Make sure that the minor numbers corresponding to the four | |
4515 | first modes always get the same names */ | |
4516 | i = mode << (4 - ST_NBR_MODE_BITS); | |
4517 | snprintf(name, 10, "%s%s%s", rew ? "n" : "", | |
4518 | STp->disk->disk_name, st_formats[i]); | |
4519 | st_class_member = | |
af23782b JM |
4520 | device_create(&st_sysfs_class, |
4521 | &STp->device->sdev_gendev, | |
d73a1a67 GKH |
4522 | MKDEV(SCSI_TAPE_MAJOR, |
4523 | TAPE_MINOR(dev_num, mode, rew)), | |
4524 | &STp->modes[mode], "%s", name); | |
1da177e4 | 4525 | if (IS_ERR(st_class_member)) { |
ee959b00 | 4526 | printk(KERN_WARNING "st%d: device_create failed\n", |
1da177e4 | 4527 | dev_num); |
13026a6b | 4528 | error = PTR_ERR(st_class_member); |
1da177e4 LT |
4529 | goto out; |
4530 | } | |
1da177e4 | 4531 | |
1da177e4 LT |
4532 | if (mode == 0 && rew == 0) { |
4533 | error = sysfs_create_link(&STp->device->sdev_gendev.kobj, | |
4534 | &st_class_member->kobj, | |
4535 | "tape"); | |
4536 | if (error) { | |
4537 | printk(KERN_ERR | |
4538 | "st%d: Can't create sysfs link from SCSI device.\n", | |
4539 | dev_num); | |
13026a6b | 4540 | goto out; |
1da177e4 LT |
4541 | } |
4542 | } | |
4543 | } | |
13026a6b JG |
4544 | |
4545 | return 0; | |
4546 | ||
4547 | out: | |
4548 | return error; | |
1da177e4 LT |
4549 | } |
4550 | ||
1da177e4 | 4551 | /* The following functions may be useful for a larger audience. */ |
6620742f FT |
4552 | static int sgl_map_user_pages(struct st_buffer *STbp, |
4553 | const unsigned int max_pages, unsigned long uaddr, | |
4554 | size_t count, int rw) | |
1da177e4 | 4555 | { |
07542b83 JB |
4556 | unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; |
4557 | unsigned long start = uaddr >> PAGE_SHIFT; | |
4558 | const int nr_pages = end - start; | |
1da177e4 | 4559 | int res, i, j; |
1da177e4 | 4560 | struct page **pages; |
6620742f | 4561 | struct rq_map_data *mdata = &STbp->map_data; |
1da177e4 | 4562 | |
1da177e4 LT |
4563 | /* User attempted Overflow! */ |
4564 | if ((uaddr + count) < uaddr) | |
4565 | return -EINVAL; | |
4566 | ||
4567 | /* Too big */ | |
4568 | if (nr_pages > max_pages) | |
4569 | return -ENOMEM; | |
4570 | ||
4571 | /* Hmm? */ | |
4572 | if (count == 0) | |
4573 | return 0; | |
4574 | ||
4575 | if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL) | |
4576 | return -ENOMEM; | |
4577 | ||
4578 | /* Try to fault in all of the necessary pages */ | |
4579 | down_read(¤t->mm->mmap_sem); | |
4580 | /* rw==READ means read from drive, write into memory area */ | |
4581 | res = get_user_pages( | |
4582 | current, | |
4583 | current->mm, | |
4584 | uaddr, | |
4585 | nr_pages, | |
4586 | rw == READ, | |
4587 | 0, /* don't force */ | |
4588 | pages, | |
4589 | NULL); | |
4590 | up_read(¤t->mm->mmap_sem); | |
4591 | ||
4592 | /* Errors and no page mapped should return here */ | |
4593 | if (res < nr_pages) | |
4594 | goto out_unmap; | |
4595 | ||
4596 | for (i=0; i < nr_pages; i++) { | |
4597 | /* FIXME: flush superflous for rw==READ, | |
4598 | * probably wrong function for rw==WRITE | |
4599 | */ | |
4600 | flush_dcache_page(pages[i]); | |
4601 | } | |
4602 | ||
6620742f | 4603 | mdata->offset = uaddr & ~PAGE_MASK; |
6620742f | 4604 | STbp->mapped_pages = pages; |
1da177e4 | 4605 | |
1da177e4 | 4606 | return nr_pages; |
1da177e4 LT |
4607 | out_unmap: |
4608 | if (res > 0) { | |
4609 | for (j=0; j < res; j++) | |
4610 | page_cache_release(pages[j]); | |
6bc733e9 | 4611 | res = 0; |
1da177e4 LT |
4612 | } |
4613 | kfree(pages); | |
4614 | return res; | |
4615 | } | |
4616 | ||
4617 | ||
4618 | /* And unmap them... */ | |
6620742f FT |
4619 | static int sgl_unmap_user_pages(struct st_buffer *STbp, |
4620 | const unsigned int nr_pages, int dirtied) | |
1da177e4 LT |
4621 | { |
4622 | int i; | |
4623 | ||
4624 | for (i=0; i < nr_pages; i++) { | |
6620742f | 4625 | struct page *page = STbp->mapped_pages[i]; |
b5810039 | 4626 | |
b5810039 NP |
4627 | if (dirtied) |
4628 | SetPageDirty(page); | |
1da177e4 LT |
4629 | /* FIXME: cache flush missing for rw==READ |
4630 | * FIXME: call the correct reference counting function | |
4631 | */ | |
b5810039 | 4632 | page_cache_release(page); |
1da177e4 | 4633 | } |
6620742f FT |
4634 | kfree(STbp->mapped_pages); |
4635 | STbp->mapped_pages = NULL; | |
1da177e4 LT |
4636 | |
4637 | return 0; | |
4638 | } |