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 | 39 | #include <linux/cdev.h> |
6c648d95 | 40 | #include <linux/idr.h> |
1da177e4 | 41 | #include <linux/delay.h> |
0b950672 | 42 | #include <linux/mutex.h> |
1da177e4 LT |
43 | |
44 | #include <asm/uaccess.h> | |
45 | #include <asm/dma.h> | |
1da177e4 LT |
46 | |
47 | #include <scsi/scsi.h> | |
48 | #include <scsi/scsi_dbg.h> | |
49 | #include <scsi/scsi_device.h> | |
50 | #include <scsi/scsi_driver.h> | |
51 | #include <scsi/scsi_eh.h> | |
52 | #include <scsi/scsi_host.h> | |
53 | #include <scsi/scsi_ioctl.h> | |
16c4b3e2 | 54 | #include <scsi/sg.h> |
1da177e4 LT |
55 | |
56 | ||
57 | /* The driver prints some debugging information on the console if DEBUG | |
58 | is defined and non-zero. */ | |
2bec708a LO |
59 | #define DEBUG 1 |
60 | #define NO_DEBUG 0 | |
1da177e4 | 61 | |
b30d8bca | 62 | #define ST_DEB_MSG KERN_NOTICE |
1da177e4 LT |
63 | #if DEBUG |
64 | /* The message level for the debug messages is currently set to KERN_NOTICE | |
65 | so that people can easily see the messages. Later when the debugging messages | |
66 | in the drivers are more widely classified, this may be changed to KERN_DEBUG. */ | |
1da177e4 LT |
67 | #define DEB(a) a |
68 | #define DEBC(a) if (debugging) { a ; } | |
69 | #else | |
70 | #define DEB(a) | |
71 | #define DEBC(a) | |
72 | #endif | |
73 | ||
74 | #define ST_KILOBYTE 1024 | |
75 | ||
76 | #include "st_options.h" | |
77 | #include "st.h" | |
78 | ||
79 | static int buffer_kbs; | |
80 | static int max_sg_segs; | |
81 | static int try_direct_io = TRY_DIRECT_IO; | |
82 | static int try_rdio = 1; | |
83 | static int try_wdio = 1; | |
2bec708a | 84 | static int debug_flag; |
1da177e4 | 85 | |
af23782b | 86 | static struct class st_sysfs_class; |
c69c6be5 | 87 | static const struct attribute_group *st_dev_groups[]; |
442d7562 | 88 | static const struct attribute_group *st_drv_groups[]; |
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)"); | |
2bec708a LO |
106 | module_param_named(debug_flag, debug_flag, int, 0); |
107 | MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1"); | |
108 | ||
1da177e4 LT |
109 | |
110 | /* Extra parameters for testing */ | |
111 | module_param_named(try_rdio, try_rdio, int, 0); | |
112 | MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); | |
113 | module_param_named(try_wdio, try_wdio, int, 0); | |
114 | MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); | |
115 | ||
116 | #ifndef MODULE | |
117 | static int write_threshold_kbs; /* retained for compatibility */ | |
118 | static struct st_dev_parm { | |
119 | char *name; | |
120 | int *val; | |
121 | } parms[] __initdata = { | |
122 | { | |
123 | "buffer_kbs", &buffer_kbs | |
124 | }, | |
125 | { /* Retained for compatibility with 2.4 */ | |
126 | "write_threshold_kbs", &write_threshold_kbs | |
127 | }, | |
128 | { | |
129 | "max_sg_segs", NULL | |
130 | }, | |
131 | { | |
132 | "try_direct_io", &try_direct_io | |
2bec708a LO |
133 | }, |
134 | { | |
135 | "debug_flag", &debug_flag | |
1da177e4 LT |
136 | } |
137 | }; | |
138 | #endif | |
139 | ||
140 | /* Restrict the number of modes so that names for all are assigned */ | |
141 | #if ST_NBR_MODES > 16 | |
142 | #error "Maximum number of modes is 16" | |
143 | #endif | |
144 | /* Bit reversed order to get same names for same minors with all | |
145 | mode counts */ | |
0ad78200 | 146 | static const char *st_formats[] = { |
1da177e4 LT |
147 | "", "r", "k", "s", "l", "t", "o", "u", |
148 | "m", "v", "p", "x", "a", "y", "q", "z"}; | |
149 | ||
150 | /* The default definitions have been moved to st_options.h */ | |
151 | ||
152 | #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) | |
153 | ||
154 | /* The buffer size should fit into the 24 bits for length in the | |
155 | 6-byte SCSI read and write commands. */ | |
156 | #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) | |
157 | #error "Buffer size should not exceed (2 << 24 - 1) bytes!" | |
158 | #endif | |
159 | ||
160 | static int debugging = DEBUG; | |
161 | ||
162 | #define MAX_RETRIES 0 | |
163 | #define MAX_WRITE_RETRIES 0 | |
164 | #define MAX_READY_RETRIES 0 | |
165 | #define NO_TAPE NOT_READY | |
166 | ||
167 | #define ST_TIMEOUT (900 * HZ) | |
168 | #define ST_LONG_TIMEOUT (14000 * HZ) | |
169 | ||
170 | /* Remove mode bits and auto-rewind bit (7) */ | |
171 | #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ | |
172 | (iminor(x) & ~(-1 << ST_MODE_SHIFT)) ) | |
173 | #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) | |
174 | ||
175 | /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ | |
176 | #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ | |
177 | (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) | |
178 | ||
179 | /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower | |
180 | 24 bits) */ | |
181 | #define SET_DENS_AND_BLK 0x10001 | |
182 | ||
1da177e4 LT |
183 | static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; |
184 | static int st_max_sg_segs = ST_MAX_SG; | |
185 | ||
1da177e4 LT |
186 | static int modes_defined; |
187 | ||
1da177e4 | 188 | static int enlarge_buffer(struct st_buffer *, int, int); |
40f6b36c | 189 | static void clear_buffer(struct st_buffer *); |
1da177e4 LT |
190 | static void normalize_buffer(struct st_buffer *); |
191 | static int append_to_buffer(const char __user *, struct st_buffer *, int); | |
192 | static int from_buffer(struct st_buffer *, char __user *, int); | |
193 | static void move_buffer_data(struct st_buffer *, int); | |
1da177e4 | 194 | |
6620742f | 195 | static int sgl_map_user_pages(struct st_buffer *, const unsigned int, |
1da177e4 | 196 | unsigned long, size_t, int); |
6620742f | 197 | static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int); |
1da177e4 LT |
198 | |
199 | static int st_probe(struct device *); | |
200 | static int st_remove(struct device *); | |
1da177e4 | 201 | |
1da177e4 | 202 | static struct scsi_driver st_template = { |
1da177e4 LT |
203 | .gendrv = { |
204 | .name = "st", | |
3af6b352 | 205 | .owner = THIS_MODULE, |
1da177e4 LT |
206 | .probe = st_probe, |
207 | .remove = st_remove, | |
442d7562 | 208 | .groups = st_drv_groups, |
1da177e4 | 209 | }, |
1da177e4 LT |
210 | }; |
211 | ||
212 | static int st_compression(struct scsi_tape *, int); | |
213 | ||
214 | static int find_partition(struct scsi_tape *); | |
215 | static int switch_partition(struct scsi_tape *); | |
216 | ||
217 | static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); | |
218 | ||
f03a5670 KM |
219 | static void scsi_tape_release(struct kref *); |
220 | ||
221 | #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref) | |
222 | ||
0b950672 | 223 | static DEFINE_MUTEX(st_ref_mutex); |
6c648d95 JM |
224 | static DEFINE_SPINLOCK(st_index_lock); |
225 | static DEFINE_SPINLOCK(st_use_lock); | |
226 | static DEFINE_IDR(st_index_idr); | |
227 | ||
f03a5670 | 228 | |
1da177e4 LT |
229 | \f |
230 | #include "osst_detect.h" | |
231 | #ifndef SIGS_FROM_OSST | |
232 | #define SIGS_FROM_OSST \ | |
233 | {"OnStream", "SC-", "", "osst"}, \ | |
234 | {"OnStream", "DI-", "", "osst"}, \ | |
235 | {"OnStream", "DP-", "", "osst"}, \ | |
236 | {"OnStream", "USB", "", "osst"}, \ | |
237 | {"OnStream", "FW-", "", "osst"} | |
238 | #endif | |
239 | ||
f03a5670 KM |
240 | static struct scsi_tape *scsi_tape_get(int dev) |
241 | { | |
242 | struct scsi_tape *STp = NULL; | |
243 | ||
0b950672 | 244 | mutex_lock(&st_ref_mutex); |
6c648d95 | 245 | spin_lock(&st_index_lock); |
f03a5670 | 246 | |
6c648d95 | 247 | STp = idr_find(&st_index_idr, dev); |
f03a5670 KM |
248 | if (!STp) goto out; |
249 | ||
250 | kref_get(&STp->kref); | |
251 | ||
252 | if (!STp->device) | |
253 | goto out_put; | |
254 | ||
255 | if (scsi_device_get(STp->device)) | |
256 | goto out_put; | |
257 | ||
258 | goto out; | |
259 | ||
260 | out_put: | |
261 | kref_put(&STp->kref, scsi_tape_release); | |
262 | STp = NULL; | |
263 | out: | |
6c648d95 | 264 | spin_unlock(&st_index_lock); |
0b950672 | 265 | mutex_unlock(&st_ref_mutex); |
f03a5670 KM |
266 | return STp; |
267 | } | |
268 | ||
269 | static void scsi_tape_put(struct scsi_tape *STp) | |
270 | { | |
271 | struct scsi_device *sdev = STp->device; | |
272 | ||
0b950672 | 273 | mutex_lock(&st_ref_mutex); |
f03a5670 KM |
274 | kref_put(&STp->kref, scsi_tape_release); |
275 | scsi_device_put(sdev); | |
0b950672 | 276 | mutex_unlock(&st_ref_mutex); |
f03a5670 KM |
277 | } |
278 | ||
1da177e4 LT |
279 | struct st_reject_data { |
280 | char *vendor; | |
281 | char *model; | |
282 | char *rev; | |
283 | char *driver_hint; /* Name of the correct driver, NULL if unknown */ | |
284 | }; | |
285 | ||
286 | static struct st_reject_data reject_list[] = { | |
287 | /* {"XXX", "Yy-", "", NULL}, example */ | |
288 | SIGS_FROM_OSST, | |
289 | {NULL, }}; | |
290 | ||
291 | /* If the device signature is on the list of incompatible drives, the | |
292 | function returns a pointer to the name of the correct driver (if known) */ | |
293 | static char * st_incompatible(struct scsi_device* SDp) | |
294 | { | |
295 | struct st_reject_data *rp; | |
296 | ||
297 | for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) | |
298 | if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && | |
299 | !strncmp(rp->model, SDp->model, strlen(rp->model)) && | |
300 | !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { | |
301 | if (rp->driver_hint) | |
302 | return rp->driver_hint; | |
303 | else | |
304 | return "unknown"; | |
305 | } | |
306 | return NULL; | |
307 | } | |
308 | \f | |
309 | ||
310 | static inline char *tape_name(struct scsi_tape *tape) | |
311 | { | |
312 | return tape->disk->disk_name; | |
313 | } | |
314 | ||
b30d8bca | 315 | #define st_printk(prefix, t, fmt, a...) \ |
22e0d994 | 316 | sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a) |
b30d8bca HR |
317 | #ifdef DEBUG |
318 | #define DEBC_printk(t, fmt, a...) \ | |
319 | if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); } | |
320 | #else | |
321 | #define DEBC_printk(t, fmt, a...) | |
322 | #endif | |
1da177e4 | 323 | |
8b05b773 | 324 | static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s) |
1da177e4 LT |
325 | { |
326 | const u8 *ucp; | |
8b05b773 | 327 | const u8 *sense = SRpnt->sense; |
1da177e4 | 328 | |
8b05b773 MC |
329 | s->have_sense = scsi_normalize_sense(SRpnt->sense, |
330 | SCSI_SENSE_BUFFERSIZE, &s->sense_hdr); | |
1da177e4 LT |
331 | s->flags = 0; |
332 | ||
333 | if (s->have_sense) { | |
334 | s->deferred = 0; | |
335 | s->remainder_valid = | |
336 | scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); | |
337 | switch (sense[0] & 0x7f) { | |
338 | case 0x71: | |
339 | s->deferred = 1; | |
340 | case 0x70: | |
341 | s->fixed_format = 1; | |
342 | s->flags = sense[2] & 0xe0; | |
343 | break; | |
344 | case 0x73: | |
345 | s->deferred = 1; | |
346 | case 0x72: | |
347 | s->fixed_format = 0; | |
348 | ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); | |
349 | s->flags = ucp ? (ucp[3] & 0xe0) : 0; | |
350 | break; | |
351 | } | |
352 | } | |
353 | } | |
354 | ||
355 | ||
356 | /* Convert the result to success code */ | |
8b05b773 | 357 | static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt) |
1da177e4 | 358 | { |
8b05b773 | 359 | int result = SRpnt->result; |
1da177e4 LT |
360 | u8 scode; |
361 | DEB(const char *stp;) | |
362 | char *name = tape_name(STp); | |
363 | struct st_cmdstatus *cmdstatp; | |
364 | ||
365 | if (!result) | |
366 | return 0; | |
367 | ||
368 | cmdstatp = &STp->buffer->cmdstat; | |
f03a5670 | 369 | st_analyze_sense(SRpnt, cmdstatp); |
1da177e4 LT |
370 | |
371 | if (cmdstatp->have_sense) | |
372 | scode = STp->buffer->cmdstat.sense_hdr.sense_key; | |
373 | else | |
374 | scode = 0; | |
375 | ||
b30d8bca HR |
376 | DEB( |
377 | if (debugging) { | |
378 | st_printk(ST_DEB_MSG, STp, | |
379 | "Error: %x, cmd: %x %x %x %x %x %x\n", result, | |
380 | SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2], | |
381 | SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]); | |
1da177e4 | 382 | if (cmdstatp->have_sense) |
d811b848 HR |
383 | __scsi_print_sense(STp->device, name, |
384 | SRpnt->sense, SCSI_SENSE_BUFFERSIZE); | |
1da177e4 LT |
385 | } ) /* end DEB */ |
386 | if (!debugging) { /* Abnormal conditions for tape */ | |
387 | if (!cmdstatp->have_sense) | |
b30d8bca HR |
388 | st_printk(KERN_WARNING, STp, |
389 | "Error %x (driver bt 0x%x, host bt 0x%x).\n", | |
390 | result, driver_byte(result), host_byte(result)); | |
1da177e4 LT |
391 | else if (cmdstatp->have_sense && |
392 | scode != NO_SENSE && | |
393 | scode != RECOVERED_ERROR && | |
394 | /* scode != UNIT_ATTENTION && */ | |
395 | scode != BLANK_CHECK && | |
396 | scode != VOLUME_OVERFLOW && | |
8b05b773 MC |
397 | SRpnt->cmd[0] != MODE_SENSE && |
398 | SRpnt->cmd[0] != TEST_UNIT_READY) { | |
4e73ea7b | 399 | |
d811b848 HR |
400 | __scsi_print_sense(STp->device, name, |
401 | SRpnt->sense, SCSI_SENSE_BUFFERSIZE); | |
1da177e4 LT |
402 | } |
403 | } | |
404 | ||
405 | if (cmdstatp->fixed_format && | |
406 | STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ | |
407 | if (STp->cln_sense_value) | |
8b05b773 | 408 | STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & |
1da177e4 LT |
409 | STp->cln_sense_mask) == STp->cln_sense_value); |
410 | else | |
8b05b773 | 411 | STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & |
1da177e4 LT |
412 | STp->cln_sense_mask) != 0); |
413 | } | |
414 | if (cmdstatp->have_sense && | |
415 | cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17) | |
416 | STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */ | |
417 | ||
418 | STp->pos_unknown |= STp->device->was_reset; | |
419 | ||
420 | if (cmdstatp->have_sense && | |
421 | scode == RECOVERED_ERROR | |
422 | #if ST_RECOVERED_WRITE_FATAL | |
8b05b773 MC |
423 | && SRpnt->cmd[0] != WRITE_6 |
424 | && SRpnt->cmd[0] != WRITE_FILEMARKS | |
1da177e4 LT |
425 | #endif |
426 | ) { | |
427 | STp->recover_count++; | |
428 | STp->recover_reg++; | |
429 | ||
b30d8bca | 430 | DEB( |
1da177e4 | 431 | if (debugging) { |
8b05b773 | 432 | if (SRpnt->cmd[0] == READ_6) |
1da177e4 | 433 | stp = "read"; |
8b05b773 | 434 | else if (SRpnt->cmd[0] == WRITE_6) |
1da177e4 LT |
435 | stp = "write"; |
436 | else | |
437 | stp = "ioctl"; | |
b30d8bca HR |
438 | st_printk(ST_DEB_MSG, STp, |
439 | "Recovered %s error (%d).\n", | |
440 | stp, STp->recover_count); | |
1da177e4 LT |
441 | } ) /* end DEB */ |
442 | ||
443 | if (cmdstatp->flags == 0) | |
444 | return 0; | |
445 | } | |
446 | return (-EIO); | |
447 | } | |
448 | ||
4deba245 | 449 | static struct st_request *st_allocate_request(struct scsi_tape *stp) |
8b05b773 | 450 | { |
4deba245 FT |
451 | struct st_request *streq; |
452 | ||
453 | streq = kzalloc(sizeof(*streq), GFP_KERNEL); | |
454 | if (streq) | |
455 | streq->stp = stp; | |
456 | else { | |
b30d8bca HR |
457 | st_printk(KERN_ERR, stp, |
458 | "Can't get SCSI request.\n"); | |
4deba245 FT |
459 | if (signal_pending(current)) |
460 | stp->buffer->syscall_result = -EINTR; | |
461 | else | |
462 | stp->buffer->syscall_result = -EBUSY; | |
463 | } | |
464 | ||
465 | return streq; | |
8b05b773 MC |
466 | } |
467 | ||
468 | static void st_release_request(struct st_request *streq) | |
469 | { | |
470 | kfree(streq); | |
1da177e4 LT |
471 | } |
472 | ||
05545c92 SS |
473 | static void st_do_stats(struct scsi_tape *STp, struct request *req) |
474 | { | |
475 | ktime_t now; | |
476 | ||
477 | now = ktime_get(); | |
478 | if (req->cmd[0] == WRITE_6) { | |
479 | now = ktime_sub(now, STp->stats->write_time); | |
480 | atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time); | |
481 | atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); | |
482 | atomic64_inc(&STp->stats->write_cnt); | |
483 | if (req->errors) { | |
484 | atomic64_add(atomic_read(&STp->stats->last_write_size) | |
485 | - STp->buffer->cmdstat.residual, | |
486 | &STp->stats->write_byte_cnt); | |
487 | if (STp->buffer->cmdstat.residual > 0) | |
488 | atomic64_inc(&STp->stats->resid_cnt); | |
489 | } else | |
490 | atomic64_add(atomic_read(&STp->stats->last_write_size), | |
491 | &STp->stats->write_byte_cnt); | |
492 | } else if (req->cmd[0] == READ_6) { | |
493 | now = ktime_sub(now, STp->stats->read_time); | |
494 | atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time); | |
495 | atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); | |
496 | atomic64_inc(&STp->stats->read_cnt); | |
497 | if (req->errors) { | |
498 | atomic64_add(atomic_read(&STp->stats->last_read_size) | |
499 | - STp->buffer->cmdstat.residual, | |
500 | &STp->stats->read_byte_cnt); | |
501 | if (STp->buffer->cmdstat.residual > 0) | |
502 | atomic64_inc(&STp->stats->resid_cnt); | |
503 | } else | |
504 | atomic64_add(atomic_read(&STp->stats->last_read_size), | |
505 | &STp->stats->read_byte_cnt); | |
506 | } else { | |
507 | now = ktime_sub(now, STp->stats->other_time); | |
508 | atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); | |
509 | atomic64_inc(&STp->stats->other_cnt); | |
510 | } | |
511 | atomic64_dec(&STp->stats->in_flight); | |
512 | } | |
513 | ||
13b53b44 FT |
514 | static void st_scsi_execute_end(struct request *req, int uptodate) |
515 | { | |
516 | struct st_request *SRpnt = req->end_io_data; | |
517 | struct scsi_tape *STp = SRpnt->stp; | |
c68bf8ee | 518 | struct bio *tmp; |
13b53b44 FT |
519 | |
520 | STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors; | |
c3a4d78c | 521 | STp->buffer->cmdstat.residual = req->resid_len; |
13b53b44 | 522 | |
05545c92 SS |
523 | st_do_stats(STp, req); |
524 | ||
c68bf8ee | 525 | tmp = SRpnt->bio; |
13b53b44 FT |
526 | if (SRpnt->waiting) |
527 | complete(SRpnt->waiting); | |
528 | ||
c68bf8ee | 529 | blk_rq_unmap_user(tmp); |
13b53b44 FT |
530 | __blk_put_request(req->q, req); |
531 | } | |
532 | ||
533 | static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, | |
534 | int data_direction, void *buffer, unsigned bufflen, | |
535 | int timeout, int retries) | |
536 | { | |
537 | struct request *req; | |
538 | struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data; | |
539 | int err = 0; | |
540 | int write = (data_direction == DMA_TO_DEVICE); | |
05545c92 | 541 | struct scsi_tape *STp = SRpnt->stp; |
13b53b44 FT |
542 | |
543 | req = blk_get_request(SRpnt->stp->device->request_queue, write, | |
544 | GFP_KERNEL); | |
a492f075 | 545 | if (IS_ERR(req)) |
13b53b44 FT |
546 | return DRIVER_ERROR << 24; |
547 | ||
f27b087b | 548 | blk_rq_set_block_pc(req); |
13b53b44 FT |
549 | req->cmd_flags |= REQ_QUIET; |
550 | ||
551 | mdata->null_mapped = 1; | |
552 | ||
02ae2c0e KM |
553 | if (bufflen) { |
554 | err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, | |
555 | GFP_KERNEL); | |
556 | if (err) { | |
557 | blk_put_request(req); | |
558 | return DRIVER_ERROR << 24; | |
559 | } | |
13b53b44 FT |
560 | } |
561 | ||
05545c92 SS |
562 | atomic64_inc(&STp->stats->in_flight); |
563 | if (cmd[0] == WRITE_6) { | |
564 | atomic_set(&STp->stats->last_write_size, bufflen); | |
565 | STp->stats->write_time = ktime_get(); | |
566 | } else if (cmd[0] == READ_6) { | |
567 | atomic_set(&STp->stats->last_read_size, bufflen); | |
568 | STp->stats->read_time = ktime_get(); | |
569 | } else { | |
570 | STp->stats->other_time = ktime_get(); | |
571 | } | |
572 | ||
13b53b44 FT |
573 | SRpnt->bio = req->bio; |
574 | req->cmd_len = COMMAND_SIZE(cmd[0]); | |
575 | memset(req->cmd, 0, BLK_MAX_CDB); | |
576 | memcpy(req->cmd, cmd, req->cmd_len); | |
577 | req->sense = SRpnt->sense; | |
578 | req->sense_len = 0; | |
579 | req->timeout = timeout; | |
580 | req->retries = retries; | |
581 | req->end_io_data = SRpnt; | |
582 | ||
583 | blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end); | |
584 | return 0; | |
585 | } | |
586 | ||
1da177e4 LT |
587 | /* Do the scsi command. Waits until command performed if do_wait is true. |
588 | Otherwise write_behind_check() is used to check that the command | |
589 | has finished. */ | |
8b05b773 MC |
590 | static struct st_request * |
591 | st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, | |
1da177e4 LT |
592 | int bytes, int direction, int timeout, int retries, int do_wait) |
593 | { | |
f03a5670 | 594 | struct completion *waiting; |
6d476267 FT |
595 | struct rq_map_data *mdata = &STp->buffer->map_data; |
596 | int ret; | |
1da177e4 | 597 | |
f03a5670 KM |
598 | /* if async, make sure there's no command outstanding */ |
599 | if (!do_wait && ((STp->buffer)->last_SRpnt)) { | |
b30d8bca HR |
600 | st_printk(KERN_ERR, STp, |
601 | "Async command already active.\n"); | |
f03a5670 KM |
602 | if (signal_pending(current)) |
603 | (STp->buffer)->syscall_result = (-EINTR); | |
604 | else | |
605 | (STp->buffer)->syscall_result = (-EBUSY); | |
606 | return NULL; | |
607 | } | |
608 | ||
4deba245 FT |
609 | if (!SRpnt) { |
610 | SRpnt = st_allocate_request(STp); | |
611 | if (!SRpnt) | |
1da177e4 | 612 | return NULL; |
1da177e4 LT |
613 | } |
614 | ||
f03a5670 KM |
615 | /* If async IO, set last_SRpnt. This ptr tells write_behind_check |
616 | which IO is outstanding. It's nulled out when the IO completes. */ | |
617 | if (!do_wait) | |
618 | (STp->buffer)->last_SRpnt = SRpnt; | |
619 | ||
620 | waiting = &STp->wait; | |
621 | init_completion(waiting); | |
8b05b773 | 622 | SRpnt->waiting = waiting; |
1da177e4 | 623 | |
6620742f | 624 | if (STp->buffer->do_dio) { |
c982c368 | 625 | mdata->page_order = 0; |
6620742f FT |
626 | mdata->nr_entries = STp->buffer->sg_segs; |
627 | mdata->pages = STp->buffer->mapped_pages; | |
628 | } else { | |
c982c368 | 629 | mdata->page_order = STp->buffer->reserved_page_order; |
6d476267 FT |
630 | mdata->nr_entries = |
631 | DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order); | |
c982c368 FT |
632 | mdata->pages = STp->buffer->reserved_pages; |
633 | mdata->offset = 0; | |
6d476267 FT |
634 | } |
635 | ||
8b05b773 MC |
636 | memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd)); |
637 | STp->buffer->cmdstat.have_sense = 0; | |
638 | STp->buffer->syscall_result = 0; | |
639 | ||
6620742f FT |
640 | ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout, |
641 | retries); | |
6d476267 | 642 | if (ret) { |
8b05b773 MC |
643 | /* could not allocate the buffer or request was too large */ |
644 | (STp->buffer)->syscall_result = (-EBUSY); | |
787926b1 | 645 | (STp->buffer)->last_SRpnt = NULL; |
6d476267 | 646 | } else if (do_wait) { |
f03a5670 | 647 | wait_for_completion(waiting); |
8b05b773 | 648 | SRpnt->waiting = NULL; |
1da177e4 LT |
649 | (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); |
650 | } | |
8b05b773 | 651 | |
1da177e4 LT |
652 | return SRpnt; |
653 | } | |
654 | ||
655 | ||
656 | /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if | |
657 | write has been correct but EOM early warning reached, -EIO if write ended in | |
658 | error or zero if write successful. Asynchronous writes are used only in | |
659 | variable block mode. */ | |
660 | static int write_behind_check(struct scsi_tape * STp) | |
661 | { | |
662 | int retval = 0; | |
663 | struct st_buffer *STbuffer; | |
664 | struct st_partstat *STps; | |
665 | struct st_cmdstatus *cmdstatp; | |
8b05b773 | 666 | struct st_request *SRpnt; |
1da177e4 LT |
667 | |
668 | STbuffer = STp->buffer; | |
669 | if (!STbuffer->writing) | |
670 | return 0; | |
671 | ||
b30d8bca | 672 | DEB( |
1da177e4 LT |
673 | if (STp->write_pending) |
674 | STp->nbr_waits++; | |
675 | else | |
676 | STp->nbr_finished++; | |
b30d8bca | 677 | ) /* end DEB */ |
1da177e4 LT |
678 | |
679 | wait_for_completion(&(STp->wait)); | |
f03a5670 KM |
680 | SRpnt = STbuffer->last_SRpnt; |
681 | STbuffer->last_SRpnt = NULL; | |
8b05b773 | 682 | SRpnt->waiting = NULL; |
1da177e4 | 683 | |
f03a5670 | 684 | (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); |
8b05b773 | 685 | st_release_request(SRpnt); |
1da177e4 LT |
686 | |
687 | STbuffer->buffer_bytes -= STbuffer->writing; | |
688 | STps = &(STp->ps[STp->partition]); | |
689 | if (STps->drv_block >= 0) { | |
690 | if (STp->block_size == 0) | |
691 | STps->drv_block++; | |
692 | else | |
693 | STps->drv_block += STbuffer->writing / STp->block_size; | |
694 | } | |
695 | ||
696 | cmdstatp = &STbuffer->cmdstat; | |
697 | if (STbuffer->syscall_result) { | |
698 | retval = -EIO; | |
699 | if (cmdstatp->have_sense && !cmdstatp->deferred && | |
700 | (cmdstatp->flags & SENSE_EOM) && | |
701 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
702 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) { | |
703 | /* EOM at write-behind, has all data been written? */ | |
704 | if (!cmdstatp->remainder_valid || | |
705 | cmdstatp->uremainder64 == 0) | |
706 | retval = -ENOSPC; | |
707 | } | |
708 | if (retval == -EIO) | |
709 | STps->drv_block = -1; | |
710 | } | |
711 | STbuffer->writing = 0; | |
712 | ||
713 | DEB(if (debugging && retval) | |
b30d8bca HR |
714 | st_printk(ST_DEB_MSG, STp, |
715 | "Async write error %x, return value %d.\n", | |
716 | STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */ | |
1da177e4 LT |
717 | |
718 | return retval; | |
719 | } | |
720 | ||
721 | ||
722 | /* Step over EOF if it has been inadvertently crossed (ioctl not used because | |
723 | it messes up the block number). */ | |
724 | static int cross_eof(struct scsi_tape * STp, int forward) | |
725 | { | |
8b05b773 | 726 | struct st_request *SRpnt; |
1da177e4 LT |
727 | unsigned char cmd[MAX_COMMAND_SIZE]; |
728 | ||
729 | cmd[0] = SPACE; | |
730 | cmd[1] = 0x01; /* Space FileMarks */ | |
731 | if (forward) { | |
732 | cmd[2] = cmd[3] = 0; | |
733 | cmd[4] = 1; | |
734 | } else | |
735 | cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ | |
736 | cmd[5] = 0; | |
737 | ||
b30d8bca HR |
738 | DEBC_printk(STp, "Stepping over filemark %s.\n", |
739 | forward ? "forward" : "backward"); | |
1da177e4 | 740 | |
02ae2c0e KM |
741 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
742 | STp->device->request_queue->rq_timeout, | |
743 | MAX_RETRIES, 1); | |
1da177e4 | 744 | if (!SRpnt) |
02ae2c0e | 745 | return (STp->buffer)->syscall_result; |
39ade4b1 | 746 | |
02ae2c0e KM |
747 | st_release_request(SRpnt); |
748 | SRpnt = NULL; | |
1da177e4 LT |
749 | |
750 | if ((STp->buffer)->cmdstat.midlevel_result != 0) | |
b30d8bca HR |
751 | st_printk(KERN_ERR, STp, |
752 | "Stepping over filemark %s failed.\n", | |
753 | forward ? "forward" : "backward"); | |
1da177e4 | 754 | |
02ae2c0e | 755 | return (STp->buffer)->syscall_result; |
1da177e4 LT |
756 | } |
757 | ||
758 | ||
759 | /* Flush the write buffer (never need to write if variable blocksize). */ | |
8ef8d594 | 760 | static int st_flush_write_buffer(struct scsi_tape * STp) |
1da177e4 | 761 | { |
786231af | 762 | int transfer, blks; |
1da177e4 LT |
763 | int result; |
764 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 765 | struct st_request *SRpnt; |
1da177e4 LT |
766 | struct st_partstat *STps; |
767 | ||
768 | result = write_behind_check(STp); | |
769 | if (result) | |
770 | return result; | |
771 | ||
772 | result = 0; | |
773 | if (STp->dirty == 1) { | |
774 | ||
786231af | 775 | transfer = STp->buffer->buffer_bytes; |
b30d8bca | 776 | DEBC_printk(STp, "Flushing %d bytes.\n", transfer); |
1da177e4 | 777 | |
1da177e4 LT |
778 | memset(cmd, 0, MAX_COMMAND_SIZE); |
779 | cmd[0] = WRITE_6; | |
780 | cmd[1] = 1; | |
781 | blks = transfer / STp->block_size; | |
782 | cmd[2] = blks >> 16; | |
783 | cmd[3] = blks >> 8; | |
784 | cmd[4] = blks; | |
785 | ||
786 | SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE, | |
a02488ed JB |
787 | STp->device->request_queue->rq_timeout, |
788 | MAX_WRITE_RETRIES, 1); | |
1da177e4 LT |
789 | if (!SRpnt) |
790 | return (STp->buffer)->syscall_result; | |
791 | ||
792 | STps = &(STp->ps[STp->partition]); | |
793 | if ((STp->buffer)->syscall_result != 0) { | |
794 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
795 | ||
796 | if (cmdstatp->have_sense && !cmdstatp->deferred && | |
797 | (cmdstatp->flags & SENSE_EOM) && | |
798 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
799 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && | |
800 | (!cmdstatp->remainder_valid || | |
801 | cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */ | |
802 | STp->dirty = 0; | |
803 | (STp->buffer)->buffer_bytes = 0; | |
804 | if (STps->drv_block >= 0) | |
805 | STps->drv_block += blks; | |
806 | result = (-ENOSPC); | |
807 | } else { | |
b30d8bca | 808 | st_printk(KERN_ERR, STp, "Error on flush.\n"); |
1da177e4 LT |
809 | STps->drv_block = (-1); |
810 | result = (-EIO); | |
811 | } | |
812 | } else { | |
813 | if (STps->drv_block >= 0) | |
814 | STps->drv_block += blks; | |
815 | STp->dirty = 0; | |
816 | (STp->buffer)->buffer_bytes = 0; | |
817 | } | |
8b05b773 | 818 | st_release_request(SRpnt); |
1da177e4 LT |
819 | SRpnt = NULL; |
820 | } | |
821 | return result; | |
822 | } | |
823 | ||
824 | ||
825 | /* Flush the tape buffer. The tape will be positioned correctly unless | |
826 | seek_next is true. */ | |
827 | static int flush_buffer(struct scsi_tape *STp, int seek_next) | |
828 | { | |
829 | int backspace, result; | |
830 | struct st_buffer *STbuffer; | |
831 | struct st_partstat *STps; | |
832 | ||
833 | STbuffer = STp->buffer; | |
834 | ||
835 | /* | |
836 | * If there was a bus reset, block further access | |
837 | * to this device. | |
838 | */ | |
839 | if (STp->pos_unknown) | |
840 | return (-EIO); | |
841 | ||
842 | if (STp->ready != ST_READY) | |
843 | return 0; | |
844 | STps = &(STp->ps[STp->partition]); | |
845 | if (STps->rw == ST_WRITING) /* Writing */ | |
8ef8d594 | 846 | return st_flush_write_buffer(STp); |
1da177e4 LT |
847 | |
848 | if (STp->block_size == 0) | |
849 | return 0; | |
850 | ||
851 | backspace = ((STp->buffer)->buffer_bytes + | |
852 | (STp->buffer)->read_pointer) / STp->block_size - | |
853 | ((STp->buffer)->read_pointer + STp->block_size - 1) / | |
854 | STp->block_size; | |
855 | (STp->buffer)->buffer_bytes = 0; | |
856 | (STp->buffer)->read_pointer = 0; | |
857 | result = 0; | |
858 | if (!seek_next) { | |
859 | if (STps->eof == ST_FM_HIT) { | |
860 | result = cross_eof(STp, 0); /* Back over the EOF hit */ | |
861 | if (!result) | |
862 | STps->eof = ST_NOEOF; | |
863 | else { | |
864 | if (STps->drv_file >= 0) | |
865 | STps->drv_file++; | |
866 | STps->drv_block = 0; | |
867 | } | |
868 | } | |
869 | if (!result && backspace > 0) | |
870 | result = st_int_ioctl(STp, MTBSR, backspace); | |
871 | } else if (STps->eof == ST_FM_HIT) { | |
872 | if (STps->drv_file >= 0) | |
873 | STps->drv_file++; | |
874 | STps->drv_block = 0; | |
875 | STps->eof = ST_NOEOF; | |
876 | } | |
877 | return result; | |
878 | ||
879 | } | |
880 | \f | |
881 | /* Set the mode parameters */ | |
882 | static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm) | |
883 | { | |
884 | int set_it = 0; | |
885 | unsigned long arg; | |
1da177e4 LT |
886 | |
887 | if (!STp->density_changed && | |
888 | STm->default_density >= 0 && | |
889 | STm->default_density != STp->density) { | |
890 | arg = STm->default_density; | |
891 | set_it = 1; | |
892 | } else | |
893 | arg = STp->density; | |
894 | arg <<= MT_ST_DENSITY_SHIFT; | |
895 | if (!STp->blksize_changed && | |
896 | STm->default_blksize >= 0 && | |
897 | STm->default_blksize != STp->block_size) { | |
898 | arg |= STm->default_blksize; | |
899 | set_it = 1; | |
900 | } else | |
901 | arg |= STp->block_size; | |
902 | if (set_it && | |
903 | st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) { | |
b30d8bca HR |
904 | st_printk(KERN_WARNING, STp, |
905 | "Can't set default block size to %d bytes " | |
906 | "and density %x.\n", | |
907 | STm->default_blksize, STm->default_density); | |
1da177e4 LT |
908 | if (modes_defined) |
909 | return (-EINVAL); | |
910 | } | |
911 | return 0; | |
912 | } | |
913 | ||
914 | ||
8b05b773 | 915 | /* Lock or unlock the drive door. Don't use when st_request allocated. */ |
1da177e4 LT |
916 | static int do_door_lock(struct scsi_tape * STp, int do_lock) |
917 | { | |
dccfa688 | 918 | int retval; |
1da177e4 | 919 | |
b30d8bca | 920 | DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl"); |
dccfa688 CH |
921 | |
922 | retval = scsi_set_medium_removal(STp->device, | |
923 | do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW); | |
924 | if (!retval) | |
1da177e4 | 925 | STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; |
dccfa688 | 926 | else |
1da177e4 | 927 | STp->door_locked = ST_LOCK_FAILS; |
1da177e4 LT |
928 | return retval; |
929 | } | |
930 | ||
931 | ||
932 | /* Set the internal state after reset */ | |
933 | static void reset_state(struct scsi_tape *STp) | |
934 | { | |
935 | int i; | |
936 | struct st_partstat *STps; | |
937 | ||
938 | STp->pos_unknown = 0; | |
939 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
940 | STps = &(STp->ps[i]); | |
941 | STps->rw = ST_IDLE; | |
942 | STps->eof = ST_NOEOF; | |
943 | STps->at_sm = 0; | |
944 | STps->last_block_valid = 0; | |
945 | STps->drv_block = -1; | |
946 | STps->drv_file = -1; | |
947 | } | |
948 | if (STp->can_partitions) { | |
949 | STp->partition = find_partition(STp); | |
950 | if (STp->partition < 0) | |
951 | STp->partition = 0; | |
952 | STp->new_partition = STp->partition; | |
953 | } | |
954 | } | |
955 | \f | |
956 | /* Test if the drive is ready. Returns either one of the codes below or a negative system | |
957 | error code. */ | |
958 | #define CHKRES_READY 0 | |
959 | #define CHKRES_NEW_SESSION 1 | |
960 | #define CHKRES_NOT_READY 2 | |
961 | #define CHKRES_NO_TAPE 3 | |
962 | ||
963 | #define MAX_ATTENTIONS 10 | |
964 | ||
965 | static int test_ready(struct scsi_tape *STp, int do_wait) | |
966 | { | |
967 | int attentions, waits, max_wait, scode; | |
968 | int retval = CHKRES_READY, new_session = 0; | |
969 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
02ae2c0e | 970 | struct st_request *SRpnt = NULL; |
1da177e4 LT |
971 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; |
972 | ||
973 | max_wait = do_wait ? ST_BLOCK_SECONDS : 0; | |
974 | ||
975 | for (attentions=waits=0; ; ) { | |
976 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
977 | cmd[0] = TEST_UNIT_READY; | |
02ae2c0e KM |
978 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, |
979 | STp->long_timeout, MAX_READY_RETRIES, 1); | |
1da177e4 | 980 | |
02ae2c0e KM |
981 | if (!SRpnt) { |
982 | retval = (STp->buffer)->syscall_result; | |
1da177e4 | 983 | break; |
02ae2c0e | 984 | } |
1da177e4 LT |
985 | |
986 | if (cmdstatp->have_sense) { | |
987 | ||
988 | scode = cmdstatp->sense_hdr.sense_key; | |
989 | ||
990 | if (scode == UNIT_ATTENTION) { /* New media? */ | |
991 | new_session = 1; | |
992 | if (attentions < MAX_ATTENTIONS) { | |
993 | attentions++; | |
994 | continue; | |
995 | } | |
996 | else { | |
997 | retval = (-EIO); | |
998 | break; | |
999 | } | |
1000 | } | |
1001 | ||
1002 | if (scode == NOT_READY) { | |
1003 | if (waits < max_wait) { | |
1004 | if (msleep_interruptible(1000)) { | |
1005 | retval = (-EINTR); | |
1006 | break; | |
1007 | } | |
1008 | waits++; | |
1009 | continue; | |
1010 | } | |
1011 | else { | |
1012 | if ((STp->device)->scsi_level >= SCSI_2 && | |
1013 | cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */ | |
1014 | retval = CHKRES_NO_TAPE; | |
1015 | else | |
1016 | retval = CHKRES_NOT_READY; | |
1017 | break; | |
1018 | } | |
1019 | } | |
1020 | } | |
1021 | ||
1022 | retval = (STp->buffer)->syscall_result; | |
1023 | if (!retval) | |
1024 | retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY; | |
1025 | break; | |
1026 | } | |
1027 | ||
02ae2c0e KM |
1028 | if (SRpnt != NULL) |
1029 | st_release_request(SRpnt); | |
1da177e4 LT |
1030 | return retval; |
1031 | } | |
1032 | ||
1033 | ||
1034 | /* See if the drive is ready and gather information about the tape. Return values: | |
1035 | < 0 negative error code from errno.h | |
1036 | 0 drive ready | |
1037 | 1 drive not ready (possibly no tape) | |
1038 | */ | |
1039 | static int check_tape(struct scsi_tape *STp, struct file *filp) | |
1040 | { | |
1041 | int i, retval, new_session = 0, do_wait; | |
1042 | unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning; | |
1043 | unsigned short st_flags = filp->f_flags; | |
8b05b773 | 1044 | struct st_request *SRpnt = NULL; |
1da177e4 LT |
1045 | struct st_modedef *STm; |
1046 | struct st_partstat *STps; | |
496ad9aa | 1047 | struct inode *inode = file_inode(filp); |
1da177e4 LT |
1048 | int mode = TAPE_MODE(inode); |
1049 | ||
1050 | STp->ready = ST_READY; | |
1051 | ||
1052 | if (mode != STp->current_mode) { | |
b30d8bca HR |
1053 | DEBC_printk(STp, "Mode change from %d to %d.\n", |
1054 | STp->current_mode, mode); | |
1da177e4 LT |
1055 | new_session = 1; |
1056 | STp->current_mode = mode; | |
1057 | } | |
1058 | STm = &(STp->modes[STp->current_mode]); | |
1059 | ||
1060 | saved_cleaning = STp->cleaning_req; | |
1061 | STp->cleaning_req = 0; | |
1062 | ||
1063 | do_wait = ((filp->f_flags & O_NONBLOCK) == 0); | |
1064 | retval = test_ready(STp, do_wait); | |
1065 | ||
1066 | if (retval < 0) | |
1067 | goto err_out; | |
1068 | ||
1069 | if (retval == CHKRES_NEW_SESSION) { | |
1070 | STp->pos_unknown = 0; | |
1071 | STp->partition = STp->new_partition = 0; | |
1072 | if (STp->can_partitions) | |
1073 | STp->nbr_partitions = 1; /* This guess will be updated later | |
1074 | if necessary */ | |
1075 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
1076 | STps = &(STp->ps[i]); | |
1077 | STps->rw = ST_IDLE; | |
1078 | STps->eof = ST_NOEOF; | |
1079 | STps->at_sm = 0; | |
1080 | STps->last_block_valid = 0; | |
1081 | STps->drv_block = 0; | |
1082 | STps->drv_file = 0; | |
1083 | } | |
1084 | new_session = 1; | |
1085 | } | |
1086 | else { | |
1087 | STp->cleaning_req |= saved_cleaning; | |
1088 | ||
1089 | if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) { | |
1090 | if (retval == CHKRES_NO_TAPE) | |
1091 | STp->ready = ST_NO_TAPE; | |
1092 | else | |
1093 | STp->ready = ST_NOT_READY; | |
1094 | ||
1095 | STp->density = 0; /* Clear the erroneous "residue" */ | |
1096 | STp->write_prot = 0; | |
1097 | STp->block_size = 0; | |
1098 | STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); | |
1099 | STp->partition = STp->new_partition = 0; | |
1100 | STp->door_locked = ST_UNLOCKED; | |
1101 | return CHKRES_NOT_READY; | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | if (STp->omit_blklims) | |
1106 | STp->min_block = STp->max_block = (-1); | |
1107 | else { | |
1108 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
1109 | cmd[0] = READ_BLOCK_LIMITS; | |
1110 | ||
02ae2c0e KM |
1111 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, |
1112 | STp->device->request_queue->rq_timeout, | |
1113 | MAX_READY_RETRIES, 1); | |
1114 | if (!SRpnt) { | |
1115 | retval = (STp->buffer)->syscall_result; | |
1da177e4 LT |
1116 | goto err_out; |
1117 | } | |
1118 | ||
8b05b773 | 1119 | if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) { |
1da177e4 LT |
1120 | STp->max_block = ((STp->buffer)->b_data[1] << 16) | |
1121 | ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; | |
1122 | STp->min_block = ((STp->buffer)->b_data[4] << 8) | | |
1123 | (STp->buffer)->b_data[5]; | |
1124 | if ( DEB( debugging || ) !STp->inited) | |
b30d8bca HR |
1125 | st_printk(KERN_INFO, STp, |
1126 | "Block limits %d - %d bytes.\n", | |
1127 | STp->min_block, STp->max_block); | |
1da177e4 LT |
1128 | } else { |
1129 | STp->min_block = STp->max_block = (-1); | |
b30d8bca | 1130 | DEBC_printk(STp, "Can't read block limits.\n"); |
1da177e4 LT |
1131 | } |
1132 | } | |
1133 | ||
1134 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
1135 | cmd[0] = MODE_SENSE; | |
1136 | cmd[4] = 12; | |
1137 | ||
02ae2c0e KM |
1138 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, |
1139 | STp->device->request_queue->rq_timeout, | |
1140 | MAX_READY_RETRIES, 1); | |
1141 | if (!SRpnt) { | |
1142 | retval = (STp->buffer)->syscall_result; | |
1da177e4 LT |
1143 | goto err_out; |
1144 | } | |
1145 | ||
1146 | if ((STp->buffer)->syscall_result != 0) { | |
b30d8bca | 1147 | DEBC_printk(STp, "No Mode Sense.\n"); |
1da177e4 LT |
1148 | STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ |
1149 | (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ | |
1150 | STp->drv_write_prot = 0; | |
1151 | } else { | |
b30d8bca HR |
1152 | DEBC_printk(STp,"Mode sense. Length %d, " |
1153 | "medium %x, WBS %x, BLL %d\n", | |
1154 | (STp->buffer)->b_data[0], | |
1155 | (STp->buffer)->b_data[1], | |
1156 | (STp->buffer)->b_data[2], | |
1157 | (STp->buffer)->b_data[3]); | |
1da177e4 LT |
1158 | |
1159 | if ((STp->buffer)->b_data[3] >= 8) { | |
1160 | STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; | |
1161 | STp->density = (STp->buffer)->b_data[4]; | |
1162 | STp->block_size = (STp->buffer)->b_data[9] * 65536 + | |
1163 | (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; | |
b30d8bca HR |
1164 | DEBC_printk(STp, "Density %x, tape length: %x, " |
1165 | "drv buffer: %d\n", | |
1166 | STp->density, | |
1167 | (STp->buffer)->b_data[5] * 65536 + | |
1168 | (STp->buffer)->b_data[6] * 256 + | |
1169 | (STp->buffer)->b_data[7], | |
1170 | STp->drv_buffer); | |
1da177e4 LT |
1171 | } |
1172 | STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; | |
c743e44f | 1173 | if (!STp->drv_buffer && STp->immediate_filemark) { |
b30d8bca HR |
1174 | st_printk(KERN_WARNING, STp, |
1175 | "non-buffered tape: disabling " | |
1176 | "writing immediate filemarks\n"); | |
c743e44f LD |
1177 | STp->immediate_filemark = 0; |
1178 | } | |
1da177e4 | 1179 | } |
8b05b773 | 1180 | st_release_request(SRpnt); |
1da177e4 | 1181 | SRpnt = NULL; |
b30d8bca | 1182 | STp->inited = 1; |
1da177e4 LT |
1183 | |
1184 | if (STp->block_size > 0) | |
1185 | (STp->buffer)->buffer_blocks = | |
b30d8bca | 1186 | (STp->buffer)->buffer_size / STp->block_size; |
1da177e4 LT |
1187 | else |
1188 | (STp->buffer)->buffer_blocks = 1; | |
1189 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; | |
1190 | ||
b30d8bca HR |
1191 | DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n", |
1192 | STp->block_size, (STp->buffer)->buffer_size, | |
1193 | (STp->buffer)->buffer_blocks); | |
1da177e4 LT |
1194 | |
1195 | if (STp->drv_write_prot) { | |
1196 | STp->write_prot = 1; | |
1197 | ||
b30d8bca | 1198 | DEBC_printk(STp, "Write protected\n"); |
1da177e4 LT |
1199 | |
1200 | if (do_wait && | |
1201 | ((st_flags & O_ACCMODE) == O_WRONLY || | |
1202 | (st_flags & O_ACCMODE) == O_RDWR)) { | |
1203 | retval = (-EROFS); | |
1204 | goto err_out; | |
1205 | } | |
1206 | } | |
1207 | ||
1208 | if (STp->can_partitions && STp->nbr_partitions < 1) { | |
1209 | /* This code is reached when the device is opened for the first time | |
1210 | after the driver has been initialized with tape in the drive and the | |
1211 | partition support has been enabled. */ | |
b30d8bca | 1212 | DEBC_printk(STp, "Updating partition number in status.\n"); |
1da177e4 LT |
1213 | if ((STp->partition = find_partition(STp)) < 0) { |
1214 | retval = STp->partition; | |
1215 | goto err_out; | |
1216 | } | |
1217 | STp->new_partition = STp->partition; | |
1218 | STp->nbr_partitions = 1; /* This guess will be updated when necessary */ | |
1219 | } | |
1220 | ||
1221 | if (new_session) { /* Change the drive parameters for the new mode */ | |
1222 | STp->density_changed = STp->blksize_changed = 0; | |
1223 | STp->compression_changed = 0; | |
1224 | if (!(STm->defaults_for_writes) && | |
1225 | (retval = set_mode_densblk(STp, STm)) < 0) | |
1226 | goto err_out; | |
1227 | ||
1228 | if (STp->default_drvbuffer != 0xff) { | |
1229 | if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer)) | |
b30d8bca HR |
1230 | st_printk(KERN_WARNING, STp, |
1231 | "Can't set default drive " | |
1232 | "buffering to %d.\n", | |
1233 | STp->default_drvbuffer); | |
1da177e4 LT |
1234 | } |
1235 | } | |
1236 | ||
1237 | return CHKRES_READY; | |
1238 | ||
1239 | err_out: | |
1240 | return retval; | |
1241 | } | |
1242 | ||
1243 | ||
b3369c68 | 1244 | \f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host |
1da177e4 LT |
1245 | module count. */ |
1246 | static int st_open(struct inode *inode, struct file *filp) | |
1247 | { | |
1248 | int i, retval = (-EIO); | |
46a243f7 | 1249 | int resumed = 0; |
1da177e4 LT |
1250 | struct scsi_tape *STp; |
1251 | struct st_partstat *STps; | |
1252 | int dev = TAPE_NR(inode); | |
1da177e4 LT |
1253 | |
1254 | /* | |
1255 | * We really want to do nonseekable_open(inode, filp); here, but some | |
1256 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
1257 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
1258 | */ | |
1259 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
1260 | ||
b3369c68 | 1261 | if (!(STp = scsi_tape_get(dev))) { |
f03a5670 | 1262 | return -ENXIO; |
b3369c68 | 1263 | } |
f03a5670 | 1264 | |
1da177e4 | 1265 | filp->private_data = STp; |
1da177e4 | 1266 | |
6c648d95 | 1267 | spin_lock(&st_use_lock); |
1da177e4 | 1268 | if (STp->in_use) { |
6c648d95 | 1269 | spin_unlock(&st_use_lock); |
f03a5670 | 1270 | scsi_tape_put(STp); |
b30d8bca | 1271 | DEBC_printk(STp, "Device already in use.\n"); |
1da177e4 LT |
1272 | return (-EBUSY); |
1273 | } | |
1274 | ||
1da177e4 | 1275 | STp->in_use = 1; |
6c648d95 | 1276 | spin_unlock(&st_use_lock); |
1da177e4 LT |
1277 | STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; |
1278 | ||
46a243f7 ON |
1279 | if (scsi_autopm_get_device(STp->device) < 0) { |
1280 | retval = -EIO; | |
1281 | goto err_out; | |
1282 | } | |
1283 | resumed = 1; | |
1da177e4 LT |
1284 | if (!scsi_block_when_processing_errors(STp->device)) { |
1285 | retval = (-ENXIO); | |
1286 | goto err_out; | |
1287 | } | |
1288 | ||
1289 | /* See that we have at least a one page buffer available */ | |
1290 | if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) { | |
b30d8bca HR |
1291 | st_printk(KERN_WARNING, STp, |
1292 | "Can't allocate one page tape buffer.\n"); | |
1da177e4 LT |
1293 | retval = (-EOVERFLOW); |
1294 | goto err_out; | |
1295 | } | |
1296 | ||
40f6b36c | 1297 | (STp->buffer)->cleared = 0; |
1da177e4 LT |
1298 | (STp->buffer)->writing = 0; |
1299 | (STp->buffer)->syscall_result = 0; | |
1300 | ||
1301 | STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY); | |
1302 | ||
1303 | STp->dirty = 0; | |
1304 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
1305 | STps = &(STp->ps[i]); | |
1306 | STps->rw = ST_IDLE; | |
1307 | } | |
9abe16c6 | 1308 | STp->try_dio_now = STp->try_dio; |
1da177e4 LT |
1309 | STp->recover_count = 0; |
1310 | DEB( STp->nbr_waits = STp->nbr_finished = 0; | |
deee13df | 1311 | STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; ) |
1da177e4 LT |
1312 | |
1313 | retval = check_tape(STp, filp); | |
1314 | if (retval < 0) | |
1315 | goto err_out; | |
1316 | if ((filp->f_flags & O_NONBLOCK) == 0 && | |
1317 | retval != CHKRES_READY) { | |
413f7327 KM |
1318 | if (STp->ready == NO_TAPE) |
1319 | retval = (-ENOMEDIUM); | |
1320 | else | |
1321 | retval = (-EIO); | |
1da177e4 LT |
1322 | goto err_out; |
1323 | } | |
1324 | return 0; | |
1325 | ||
1326 | err_out: | |
1327 | normalize_buffer(STp->buffer); | |
0644f539 | 1328 | spin_lock(&st_use_lock); |
1da177e4 | 1329 | STp->in_use = 0; |
0644f539 | 1330 | spin_unlock(&st_use_lock); |
46a243f7 ON |
1331 | if (resumed) |
1332 | scsi_autopm_put_device(STp->device); | |
e7ac6c66 | 1333 | scsi_tape_put(STp); |
1da177e4 LT |
1334 | return retval; |
1335 | ||
1336 | } | |
1337 | \f | |
1338 | ||
1339 | /* Flush the tape buffer before close */ | |
75e1fcc0 | 1340 | static int st_flush(struct file *filp, fl_owner_t id) |
1da177e4 LT |
1341 | { |
1342 | int result = 0, result2; | |
1343 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 1344 | struct st_request *SRpnt; |
1da177e4 LT |
1345 | struct scsi_tape *STp = filp->private_data; |
1346 | struct st_modedef *STm = &(STp->modes[STp->current_mode]); | |
1347 | struct st_partstat *STps = &(STp->ps[STp->partition]); | |
1da177e4 LT |
1348 | |
1349 | if (file_count(filp) > 1) | |
1350 | return 0; | |
1351 | ||
1352 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { | |
8ef8d594 | 1353 | result = st_flush_write_buffer(STp); |
1da177e4 LT |
1354 | if (result != 0 && result != (-ENOSPC)) |
1355 | goto out; | |
1356 | } | |
1357 | ||
1358 | if (STp->can_partitions && | |
1359 | (result2 = switch_partition(STp)) < 0) { | |
b30d8bca | 1360 | DEBC_printk(STp, "switch_partition at close failed.\n"); |
1da177e4 LT |
1361 | if (result == 0) |
1362 | result = result2; | |
1363 | goto out; | |
1364 | } | |
1365 | ||
1366 | DEBC( if (STp->nbr_requests) | |
b30d8bca HR |
1367 | st_printk(KERN_DEBUG, STp, |
1368 | "Number of r/w requests %d, dio used in %d, " | |
1369 | "pages %d.\n", STp->nbr_requests, STp->nbr_dio, | |
1370 | STp->nbr_pages)); | |
1da177e4 LT |
1371 | |
1372 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { | |
1373 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1374 | ||
b30d8bca HR |
1375 | #if DEBUG |
1376 | DEBC_printk(STp, "Async write waits %d, finished %d.\n", | |
1377 | STp->nbr_waits, STp->nbr_finished); | |
1378 | #endif | |
1da177e4 LT |
1379 | memset(cmd, 0, MAX_COMMAND_SIZE); |
1380 | cmd[0] = WRITE_FILEMARKS; | |
c743e44f LD |
1381 | if (STp->immediate_filemark) |
1382 | cmd[1] = 1; | |
1da177e4 LT |
1383 | cmd[4] = 1 + STp->two_fm; |
1384 | ||
02ae2c0e KM |
1385 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
1386 | STp->device->request_queue->rq_timeout, | |
1387 | MAX_WRITE_RETRIES, 1); | |
1da177e4 | 1388 | if (!SRpnt) { |
02ae2c0e | 1389 | result = (STp->buffer)->syscall_result; |
1da177e4 LT |
1390 | goto out; |
1391 | } | |
1392 | ||
1393 | if (STp->buffer->syscall_result == 0 || | |
1394 | (cmdstatp->have_sense && !cmdstatp->deferred && | |
1395 | (cmdstatp->flags & SENSE_EOM) && | |
1396 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
1397 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && | |
1398 | (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) { | |
1399 | /* Write successful at EOM */ | |
8b05b773 | 1400 | st_release_request(SRpnt); |
1da177e4 LT |
1401 | SRpnt = NULL; |
1402 | if (STps->drv_file >= 0) | |
1403 | STps->drv_file++; | |
1404 | STps->drv_block = 0; | |
1405 | if (STp->two_fm) | |
1406 | cross_eof(STp, 0); | |
1407 | STps->eof = ST_FM; | |
1408 | } | |
1409 | else { /* Write error */ | |
8b05b773 | 1410 | st_release_request(SRpnt); |
1da177e4 | 1411 | SRpnt = NULL; |
b30d8bca HR |
1412 | st_printk(KERN_ERR, STp, |
1413 | "Error on write filemark.\n"); | |
1da177e4 LT |
1414 | if (result == 0) |
1415 | result = (-EIO); | |
1416 | } | |
1417 | ||
b30d8bca | 1418 | DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]); |
1da177e4 LT |
1419 | } else if (!STp->rew_at_close) { |
1420 | STps = &(STp->ps[STp->partition]); | |
1421 | if (!STm->sysv || STps->rw != ST_READING) { | |
1422 | if (STp->can_bsr) | |
1423 | result = flush_buffer(STp, 0); | |
1424 | else if (STps->eof == ST_FM_HIT) { | |
1425 | result = cross_eof(STp, 0); | |
1426 | if (result) { | |
1427 | if (STps->drv_file >= 0) | |
1428 | STps->drv_file++; | |
1429 | STps->drv_block = 0; | |
1430 | STps->eof = ST_FM; | |
1431 | } else | |
1432 | STps->eof = ST_NOEOF; | |
1433 | } | |
1434 | } else if ((STps->eof == ST_NOEOF && | |
1435 | !(result = cross_eof(STp, 1))) || | |
1436 | STps->eof == ST_FM_HIT) { | |
1437 | if (STps->drv_file >= 0) | |
1438 | STps->drv_file++; | |
1439 | STps->drv_block = 0; | |
1440 | STps->eof = ST_FM; | |
1441 | } | |
1442 | } | |
1443 | ||
1444 | out: | |
1445 | if (STp->rew_at_close) { | |
1446 | result2 = st_int_ioctl(STp, MTREW, 1); | |
1447 | if (result == 0) | |
1448 | result = result2; | |
1449 | } | |
1450 | return result; | |
1451 | } | |
1452 | ||
1453 | ||
1454 | /* Close the device and release it. BKL is not needed: this is the only thread | |
1455 | accessing this tape. */ | |
1456 | static int st_release(struct inode *inode, struct file *filp) | |
1457 | { | |
1458 | int result = 0; | |
1459 | struct scsi_tape *STp = filp->private_data; | |
1460 | ||
1461 | if (STp->door_locked == ST_LOCKED_AUTO) | |
1462 | do_door_lock(STp, 0); | |
1463 | ||
1464 | normalize_buffer(STp->buffer); | |
6c648d95 | 1465 | spin_lock(&st_use_lock); |
1da177e4 | 1466 | STp->in_use = 0; |
6c648d95 | 1467 | spin_unlock(&st_use_lock); |
46a243f7 | 1468 | scsi_autopm_put_device(STp->device); |
f03a5670 | 1469 | scsi_tape_put(STp); |
1da177e4 LT |
1470 | |
1471 | return result; | |
1472 | } | |
1473 | \f | |
1474 | /* The checks common to both reading and writing */ | |
1475 | static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count) | |
1476 | { | |
1477 | ssize_t retval = 0; | |
1478 | ||
1479 | /* | |
1480 | * If we are in the middle of error recovery, don't let anyone | |
1481 | * else try and use this device. Also, if error recovery fails, it | |
1482 | * may try and take the device offline, in which case all further | |
1483 | * access to the device is prohibited. | |
1484 | */ | |
1485 | if (!scsi_block_when_processing_errors(STp->device)) { | |
1486 | retval = (-ENXIO); | |
1487 | goto out; | |
1488 | } | |
1489 | ||
1490 | if (STp->ready != ST_READY) { | |
1491 | if (STp->ready == ST_NO_TAPE) | |
1492 | retval = (-ENOMEDIUM); | |
1493 | else | |
1494 | retval = (-EIO); | |
1495 | goto out; | |
1496 | } | |
1497 | ||
1498 | if (! STp->modes[STp->current_mode].defined) { | |
1499 | retval = (-ENXIO); | |
1500 | goto out; | |
1501 | } | |
1502 | ||
1503 | ||
1504 | /* | |
1505 | * If there was a bus reset, block further access | |
1506 | * to this device. | |
1507 | */ | |
1508 | if (STp->pos_unknown) { | |
1509 | retval = (-EIO); | |
1510 | goto out; | |
1511 | } | |
1512 | ||
1513 | if (count == 0) | |
1514 | goto out; | |
1515 | ||
b30d8bca | 1516 | DEB( |
1da177e4 | 1517 | if (!STp->in_use) { |
b30d8bca HR |
1518 | st_printk(ST_DEB_MSG, STp, |
1519 | "Incorrect device.\n"); | |
1da177e4 LT |
1520 | retval = (-EIO); |
1521 | goto out; | |
1522 | } ) /* end DEB */ | |
1523 | ||
1524 | if (STp->can_partitions && | |
1525 | (retval = switch_partition(STp)) < 0) | |
1526 | goto out; | |
1527 | ||
1528 | if (STp->block_size == 0 && STp->max_block > 0 && | |
1529 | (count < STp->min_block || count > STp->max_block)) { | |
1530 | retval = (-EINVAL); | |
1531 | goto out; | |
1532 | } | |
1533 | ||
1534 | if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && | |
1535 | !do_door_lock(STp, 1)) | |
1536 | STp->door_locked = ST_LOCKED_AUTO; | |
1537 | ||
1538 | out: | |
1539 | return retval; | |
1540 | } | |
1541 | ||
1542 | ||
1543 | static int setup_buffering(struct scsi_tape *STp, const char __user *buf, | |
1544 | size_t count, int is_read) | |
1545 | { | |
1546 | int i, bufsize, retval = 0; | |
1547 | struct st_buffer *STbp = STp->buffer; | |
1548 | ||
1549 | if (is_read) | |
9abe16c6 | 1550 | i = STp->try_dio_now && try_rdio; |
1da177e4 | 1551 | else |
9abe16c6 | 1552 | i = STp->try_dio_now && try_wdio; |
8b05b773 | 1553 | |
1da177e4 LT |
1554 | if (i && ((unsigned long)buf & queue_dma_alignment( |
1555 | STp->device->request_queue)) == 0) { | |
6620742f FT |
1556 | i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf, |
1557 | count, (is_read ? READ : WRITE)); | |
1da177e4 LT |
1558 | if (i > 0) { |
1559 | STbp->do_dio = i; | |
1560 | STbp->buffer_bytes = 0; /* can be used as transfer counter */ | |
1561 | } | |
1562 | else | |
1563 | STbp->do_dio = 0; /* fall back to buffering with any error */ | |
1564 | STbp->sg_segs = STbp->do_dio; | |
1da177e4 LT |
1565 | DEB( |
1566 | if (STbp->do_dio) { | |
1567 | STp->nbr_dio++; | |
1568 | STp->nbr_pages += STbp->do_dio; | |
1da177e4 LT |
1569 | } |
1570 | ) | |
1571 | } else | |
1572 | STbp->do_dio = 0; | |
1573 | DEB( STp->nbr_requests++; ) | |
1574 | ||
1575 | if (!STbp->do_dio) { | |
1576 | if (STp->block_size) | |
1577 | bufsize = STp->block_size > st_fixed_buffer_size ? | |
1578 | STp->block_size : st_fixed_buffer_size; | |
40f6b36c | 1579 | else { |
1da177e4 | 1580 | bufsize = count; |
40f6b36c KM |
1581 | /* Make sure that data from previous user is not leaked even if |
1582 | HBA does not return correct residual */ | |
1583 | if (is_read && STp->sili && !STbp->cleared) | |
1584 | clear_buffer(STbp); | |
1585 | } | |
1586 | ||
1da177e4 LT |
1587 | if (bufsize > STbp->buffer_size && |
1588 | !enlarge_buffer(STbp, bufsize, STp->restr_dma)) { | |
b30d8bca HR |
1589 | st_printk(KERN_WARNING, STp, |
1590 | "Can't allocate %d byte tape buffer.\n", | |
1591 | bufsize); | |
1da177e4 LT |
1592 | retval = (-EOVERFLOW); |
1593 | goto out; | |
1594 | } | |
1595 | if (STp->block_size) | |
1596 | STbp->buffer_blocks = bufsize / STp->block_size; | |
1597 | } | |
1598 | ||
1599 | out: | |
1600 | return retval; | |
1601 | } | |
1602 | ||
1603 | ||
1604 | /* Can be called more than once after each setup_buffer() */ | |
787926b1 | 1605 | static void release_buffering(struct scsi_tape *STp, int is_read) |
1da177e4 LT |
1606 | { |
1607 | struct st_buffer *STbp; | |
1608 | ||
1609 | STbp = STp->buffer; | |
1610 | if (STbp->do_dio) { | |
6620742f | 1611 | sgl_unmap_user_pages(STbp, STbp->do_dio, is_read); |
1da177e4 | 1612 | STbp->do_dio = 0; |
787926b1 | 1613 | STbp->sg_segs = 0; |
1da177e4 LT |
1614 | } |
1615 | } | |
1616 | ||
1617 | ||
1618 | /* Write command */ | |
1619 | static ssize_t | |
1620 | st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
1621 | { | |
1622 | ssize_t total; | |
1623 | ssize_t i, do_count, blks, transfer; | |
1624 | ssize_t retval; | |
1625 | int undone, retry_eot = 0, scode; | |
1626 | int async_write; | |
1627 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
1628 | const char __user *b_point; | |
8b05b773 | 1629 | struct st_request *SRpnt = NULL; |
1da177e4 LT |
1630 | struct scsi_tape *STp = filp->private_data; |
1631 | struct st_modedef *STm; | |
1632 | struct st_partstat *STps; | |
1633 | struct st_buffer *STbp; | |
1da177e4 | 1634 | |
28f85009 | 1635 | if (mutex_lock_interruptible(&STp->lock)) |
1da177e4 LT |
1636 | return -ERESTARTSYS; |
1637 | ||
1638 | retval = rw_checks(STp, filp, count); | |
1639 | if (retval || count == 0) | |
1640 | goto out; | |
1641 | ||
1642 | /* Write must be integral number of blocks */ | |
1643 | if (STp->block_size != 0 && (count % STp->block_size) != 0) { | |
b30d8bca HR |
1644 | st_printk(KERN_WARNING, STp, |
1645 | "Write not multiple of tape block size.\n"); | |
1da177e4 LT |
1646 | retval = (-EINVAL); |
1647 | goto out; | |
1648 | } | |
1649 | ||
1650 | STm = &(STp->modes[STp->current_mode]); | |
1651 | STps = &(STp->ps[STp->partition]); | |
1652 | ||
1653 | if (STp->write_prot) { | |
1654 | retval = (-EACCES); | |
1655 | goto out; | |
1656 | } | |
1657 | ||
1658 | ||
1659 | if (STps->rw == ST_READING) { | |
1660 | retval = flush_buffer(STp, 0); | |
1661 | if (retval) | |
1662 | goto out; | |
1663 | STps->rw = ST_WRITING; | |
1664 | } else if (STps->rw != ST_WRITING && | |
1665 | STps->drv_file == 0 && STps->drv_block == 0) { | |
1666 | if ((retval = set_mode_densblk(STp, STm)) < 0) | |
1667 | goto out; | |
1668 | if (STm->default_compression != ST_DONT_TOUCH && | |
1669 | !(STp->compression_changed)) { | |
1670 | if (st_compression(STp, (STm->default_compression == ST_YES))) { | |
b30d8bca HR |
1671 | st_printk(KERN_WARNING, STp, |
1672 | "Can't set default compression.\n"); | |
1da177e4 LT |
1673 | if (modes_defined) { |
1674 | retval = (-EINVAL); | |
1675 | goto out; | |
1676 | } | |
1677 | } | |
1678 | } | |
1679 | } | |
1680 | ||
1681 | STbp = STp->buffer; | |
1682 | i = write_behind_check(STp); | |
1683 | if (i) { | |
1684 | if (i == -ENOSPC) | |
1685 | STps->eof = ST_EOM_OK; | |
1686 | else | |
1687 | STps->eof = ST_EOM_ERROR; | |
1688 | } | |
1689 | ||
1690 | if (STps->eof == ST_EOM_OK) { | |
1691 | STps->eof = ST_EOD_1; /* allow next write */ | |
1692 | retval = (-ENOSPC); | |
1693 | goto out; | |
1694 | } | |
1695 | else if (STps->eof == ST_EOM_ERROR) { | |
1696 | retval = (-EIO); | |
1697 | goto out; | |
1698 | } | |
1699 | ||
1700 | /* Check the buffer readability in cases where copy_user might catch | |
1701 | the problems after some tape movement. */ | |
1702 | if (STp->block_size != 0 && | |
1703 | !STbp->do_dio && | |
1704 | (copy_from_user(&i, buf, 1) != 0 || | |
1705 | copy_from_user(&i, buf + count - 1, 1) != 0)) { | |
1706 | retval = (-EFAULT); | |
1707 | goto out; | |
1708 | } | |
1709 | ||
1710 | retval = setup_buffering(STp, buf, count, 0); | |
1711 | if (retval) | |
1712 | goto out; | |
1713 | ||
1714 | total = count; | |
1715 | ||
1716 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1717 | cmd[0] = WRITE_6; | |
1718 | cmd[1] = (STp->block_size != 0); | |
1719 | ||
1720 | STps->rw = ST_WRITING; | |
1721 | ||
1722 | b_point = buf; | |
1723 | while (count > 0 && !retry_eot) { | |
1724 | ||
1725 | if (STbp->do_dio) { | |
1726 | do_count = count; | |
1727 | } | |
1728 | else { | |
1729 | if (STp->block_size == 0) | |
1730 | do_count = count; | |
1731 | else { | |
1732 | do_count = STbp->buffer_blocks * STp->block_size - | |
1733 | STbp->buffer_bytes; | |
1734 | if (do_count > count) | |
1735 | do_count = count; | |
1736 | } | |
1737 | ||
1738 | i = append_to_buffer(b_point, STbp, do_count); | |
1739 | if (i) { | |
1740 | retval = i; | |
1741 | goto out; | |
1742 | } | |
1743 | } | |
1744 | count -= do_count; | |
1745 | b_point += do_count; | |
1746 | ||
1747 | async_write = STp->block_size == 0 && !STbp->do_dio && | |
1748 | STm->do_async_writes && STps->eof < ST_EOM_OK; | |
1749 | ||
1750 | if (STp->block_size != 0 && STm->do_buffer_writes && | |
9abe16c6 | 1751 | !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK && |
1da177e4 LT |
1752 | STbp->buffer_bytes < STbp->buffer_size) { |
1753 | STp->dirty = 1; | |
1754 | /* Don't write a buffer that is not full enough. */ | |
1755 | if (!async_write && count == 0) | |
1756 | break; | |
1757 | } | |
1758 | ||
1759 | retry_write: | |
1760 | if (STp->block_size == 0) | |
1761 | blks = transfer = do_count; | |
1762 | else { | |
1763 | if (!STbp->do_dio) | |
1764 | blks = STbp->buffer_bytes; | |
1765 | else | |
1766 | blks = do_count; | |
1767 | blks /= STp->block_size; | |
1768 | transfer = blks * STp->block_size; | |
1769 | } | |
1770 | cmd[2] = blks >> 16; | |
1771 | cmd[3] = blks >> 8; | |
1772 | cmd[4] = blks; | |
1773 | ||
1774 | SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE, | |
a02488ed JB |
1775 | STp->device->request_queue->rq_timeout, |
1776 | MAX_WRITE_RETRIES, !async_write); | |
1da177e4 LT |
1777 | if (!SRpnt) { |
1778 | retval = STbp->syscall_result; | |
1779 | goto out; | |
1780 | } | |
8b05b773 | 1781 | if (async_write && !STbp->syscall_result) { |
1da177e4 LT |
1782 | STbp->writing = transfer; |
1783 | STp->dirty = !(STbp->writing == | |
1784 | STbp->buffer_bytes); | |
1785 | SRpnt = NULL; /* Prevent releasing this request! */ | |
1786 | DEB( STp->write_pending = 1; ) | |
1787 | break; | |
1788 | } | |
1789 | ||
1790 | if (STbp->syscall_result != 0) { | |
1791 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1792 | ||
b30d8bca | 1793 | DEBC_printk(STp, "Error on write:\n"); |
1da177e4 LT |
1794 | if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) { |
1795 | scode = cmdstatp->sense_hdr.sense_key; | |
1796 | if (cmdstatp->remainder_valid) | |
1797 | undone = (int)cmdstatp->uremainder64; | |
1798 | else if (STp->block_size == 0 && | |
1799 | scode == VOLUME_OVERFLOW) | |
1800 | undone = transfer; | |
1801 | else | |
1802 | undone = 0; | |
1803 | if (STp->block_size != 0) | |
1804 | undone *= STp->block_size; | |
1805 | if (undone <= do_count) { | |
1806 | /* Only data from this write is not written */ | |
1807 | count += undone; | |
626dcb1e | 1808 | b_point -= undone; |
1da177e4 LT |
1809 | do_count -= undone; |
1810 | if (STp->block_size) | |
1811 | blks = (transfer - undone) / STp->block_size; | |
1812 | STps->eof = ST_EOM_OK; | |
1813 | /* Continue in fixed block mode if all written | |
1814 | in this request but still something left to write | |
1815 | (retval left to zero) | |
1816 | */ | |
1817 | if (STp->block_size == 0 || | |
1818 | undone > 0 || count == 0) | |
1819 | retval = (-ENOSPC); /* EOM within current request */ | |
b30d8bca HR |
1820 | DEBC_printk(STp, "EOM with %d " |
1821 | "bytes unwritten.\n", | |
1822 | (int)count); | |
1da177e4 LT |
1823 | } else { |
1824 | /* EOT within data buffered earlier (possible only | |
1825 | in fixed block mode without direct i/o) */ | |
1826 | if (!retry_eot && !cmdstatp->deferred && | |
1827 | (scode == NO_SENSE || scode == RECOVERED_ERROR)) { | |
1828 | move_buffer_data(STp->buffer, transfer - undone); | |
1829 | retry_eot = 1; | |
1830 | if (STps->drv_block >= 0) { | |
1831 | STps->drv_block += (transfer - undone) / | |
1832 | STp->block_size; | |
1833 | } | |
1834 | STps->eof = ST_EOM_OK; | |
b30d8bca HR |
1835 | DEBC_printk(STp, "Retry " |
1836 | "write of %d " | |
1837 | "bytes at EOM.\n", | |
1838 | STp->buffer->buffer_bytes); | |
1da177e4 LT |
1839 | goto retry_write; |
1840 | } | |
1841 | else { | |
1842 | /* Either error within data buffered by driver or | |
1843 | failed retry */ | |
1844 | count -= do_count; | |
1845 | blks = do_count = 0; | |
1846 | STps->eof = ST_EOM_ERROR; | |
1847 | STps->drv_block = (-1); /* Too cautious? */ | |
1848 | retval = (-EIO); /* EOM for old data */ | |
b30d8bca HR |
1849 | DEBC_printk(STp, "EOM with " |
1850 | "lost data.\n"); | |
1da177e4 LT |
1851 | } |
1852 | } | |
1853 | } else { | |
1854 | count += do_count; | |
1855 | STps->drv_block = (-1); /* Too cautious? */ | |
8b05b773 | 1856 | retval = STbp->syscall_result; |
1da177e4 LT |
1857 | } |
1858 | ||
1859 | } | |
1860 | ||
1861 | if (STps->drv_block >= 0) { | |
1862 | if (STp->block_size == 0) | |
1863 | STps->drv_block += (do_count > 0); | |
1864 | else | |
1865 | STps->drv_block += blks; | |
1866 | } | |
1867 | ||
1868 | STbp->buffer_bytes = 0; | |
1869 | STp->dirty = 0; | |
1870 | ||
1871 | if (retval || retry_eot) { | |
1872 | if (count < total) | |
1873 | retval = total - count; | |
1874 | goto out; | |
1875 | } | |
1876 | } | |
1877 | ||
1878 | if (STps->eof == ST_EOD_1) | |
1879 | STps->eof = ST_EOM_OK; | |
1880 | else if (STps->eof != ST_EOM_OK) | |
1881 | STps->eof = ST_NOEOF; | |
1882 | retval = total - count; | |
1883 | ||
1884 | out: | |
1885 | if (SRpnt != NULL) | |
8b05b773 | 1886 | st_release_request(SRpnt); |
787926b1 | 1887 | release_buffering(STp, 0); |
28f85009 | 1888 | mutex_unlock(&STp->lock); |
1da177e4 LT |
1889 | |
1890 | return retval; | |
1891 | } | |
1892 | \f | |
1893 | /* Read data from the tape. Returns zero in the normal case, one if the | |
1894 | eof status has changed, and the negative error code in case of a | |
1895 | fatal error. Otherwise updates the buffer and the eof state. | |
1896 | ||
1897 | Does release user buffer mapping if it is set. | |
1898 | */ | |
1899 | static long read_tape(struct scsi_tape *STp, long count, | |
8b05b773 | 1900 | struct st_request ** aSRpnt) |
1da177e4 LT |
1901 | { |
1902 | int transfer, blks, bytes; | |
1903 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 1904 | struct st_request *SRpnt; |
1da177e4 LT |
1905 | struct st_modedef *STm; |
1906 | struct st_partstat *STps; | |
1907 | struct st_buffer *STbp; | |
1908 | int retval = 0; | |
1da177e4 LT |
1909 | |
1910 | if (count == 0) | |
1911 | return 0; | |
1912 | ||
1913 | STm = &(STp->modes[STp->current_mode]); | |
1914 | STps = &(STp->ps[STp->partition]); | |
1915 | if (STps->eof == ST_FM_HIT) | |
1916 | return 1; | |
1917 | STbp = STp->buffer; | |
1918 | ||
1919 | if (STp->block_size == 0) | |
1920 | blks = bytes = count; | |
1921 | else { | |
9abe16c6 | 1922 | if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) { |
1da177e4 LT |
1923 | blks = (STp->buffer)->buffer_blocks; |
1924 | bytes = blks * STp->block_size; | |
1925 | } else { | |
1926 | bytes = count; | |
1927 | if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size) | |
1928 | bytes = (STp->buffer)->buffer_size; | |
1929 | blks = bytes / STp->block_size; | |
1930 | bytes = blks * STp->block_size; | |
1931 | } | |
1932 | } | |
1933 | ||
1934 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1935 | cmd[0] = READ_6; | |
1936 | cmd[1] = (STp->block_size != 0); | |
40f6b36c KM |
1937 | if (!cmd[1] && STp->sili) |
1938 | cmd[1] |= 2; | |
1da177e4 LT |
1939 | cmd[2] = blks >> 16; |
1940 | cmd[3] = blks >> 8; | |
1941 | cmd[4] = blks; | |
1942 | ||
1943 | SRpnt = *aSRpnt; | |
1944 | SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE, | |
a02488ed JB |
1945 | STp->device->request_queue->rq_timeout, |
1946 | MAX_RETRIES, 1); | |
787926b1 | 1947 | release_buffering(STp, 1); |
1da177e4 LT |
1948 | *aSRpnt = SRpnt; |
1949 | if (!SRpnt) | |
1950 | return STbp->syscall_result; | |
1951 | ||
1952 | STbp->read_pointer = 0; | |
1953 | STps->at_sm = 0; | |
1954 | ||
1955 | /* Something to check */ | |
1956 | if (STbp->syscall_result) { | |
1957 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1958 | ||
1959 | retval = 1; | |
b30d8bca HR |
1960 | DEBC_printk(STp, |
1961 | "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", | |
1962 | SRpnt->sense[0], SRpnt->sense[1], | |
1963 | SRpnt->sense[2], SRpnt->sense[3], | |
1964 | SRpnt->sense[4], SRpnt->sense[5], | |
1965 | SRpnt->sense[6], SRpnt->sense[7]); | |
1da177e4 LT |
1966 | if (cmdstatp->have_sense) { |
1967 | ||
1968 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) | |
1969 | cmdstatp->flags &= 0xcf; /* No need for EOM in this case */ | |
1970 | ||
1971 | if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */ | |
1972 | /* Compute the residual count */ | |
1973 | if (cmdstatp->remainder_valid) | |
1974 | transfer = (int)cmdstatp->uremainder64; | |
1975 | else | |
1976 | transfer = 0; | |
1977 | if (STp->block_size == 0 && | |
1978 | cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) | |
1979 | transfer = bytes; | |
1980 | ||
1981 | if (cmdstatp->flags & SENSE_ILI) { /* ILI */ | |
b30d8bca HR |
1982 | if (STp->block_size == 0 && |
1983 | transfer < 0) { | |
1984 | st_printk(KERN_NOTICE, STp, | |
1985 | "Failed to read %d " | |
1986 | "byte block with %d " | |
1987 | "byte transfer.\n", | |
1988 | bytes - transfer, | |
1989 | bytes); | |
1990 | if (STps->drv_block >= 0) | |
1991 | STps->drv_block += 1; | |
1992 | STbp->buffer_bytes = 0; | |
1993 | return (-ENOMEM); | |
1994 | } else if (STp->block_size == 0) { | |
1da177e4 LT |
1995 | STbp->buffer_bytes = bytes - transfer; |
1996 | } else { | |
8b05b773 | 1997 | st_release_request(SRpnt); |
1da177e4 LT |
1998 | SRpnt = *aSRpnt = NULL; |
1999 | if (transfer == blks) { /* We did not get anything, error */ | |
b30d8bca HR |
2000 | st_printk(KERN_NOTICE, STp, |
2001 | "Incorrect " | |
2002 | "block size.\n"); | |
1da177e4 LT |
2003 | if (STps->drv_block >= 0) |
2004 | STps->drv_block += blks - transfer + 1; | |
2005 | st_int_ioctl(STp, MTBSR, 1); | |
2006 | return (-EIO); | |
2007 | } | |
2008 | /* We have some data, deliver it */ | |
2009 | STbp->buffer_bytes = (blks - transfer) * | |
2010 | STp->block_size; | |
b30d8bca HR |
2011 | DEBC_printk(STp, "ILI but " |
2012 | "enough data " | |
2013 | "received %ld " | |
2014 | "%d.\n", count, | |
2015 | STbp->buffer_bytes); | |
1da177e4 LT |
2016 | if (STps->drv_block >= 0) |
2017 | STps->drv_block += 1; | |
2018 | if (st_int_ioctl(STp, MTBSR, 1)) | |
2019 | return (-EIO); | |
2020 | } | |
2021 | } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */ | |
2022 | if (STps->eof != ST_FM_HIT) | |
2023 | STps->eof = ST_FM_HIT; | |
2024 | else | |
2025 | STps->eof = ST_EOD_2; | |
2026 | if (STp->block_size == 0) | |
2027 | STbp->buffer_bytes = 0; | |
2028 | else | |
2029 | STbp->buffer_bytes = | |
2030 | bytes - transfer * STp->block_size; | |
b30d8bca HR |
2031 | DEBC_printk(STp, "EOF detected (%d " |
2032 | "bytes read).\n", | |
2033 | STbp->buffer_bytes); | |
1da177e4 LT |
2034 | } else if (cmdstatp->flags & SENSE_EOM) { |
2035 | if (STps->eof == ST_FM) | |
2036 | STps->eof = ST_EOD_1; | |
2037 | else | |
2038 | STps->eof = ST_EOM_OK; | |
2039 | if (STp->block_size == 0) | |
2040 | STbp->buffer_bytes = bytes - transfer; | |
2041 | else | |
2042 | STbp->buffer_bytes = | |
2043 | bytes - transfer * STp->block_size; | |
2044 | ||
b30d8bca HR |
2045 | DEBC_printk(STp, "EOM detected (%d " |
2046 | "bytes read).\n", | |
2047 | STbp->buffer_bytes); | |
1da177e4 LT |
2048 | } |
2049 | } | |
b30d8bca | 2050 | /* end of EOF, EOM, ILI test */ |
1da177e4 | 2051 | else { /* nonzero sense key */ |
b30d8bca | 2052 | DEBC_printk(STp, "Tape error while reading.\n"); |
1da177e4 LT |
2053 | STps->drv_block = (-1); |
2054 | if (STps->eof == ST_FM && | |
2055 | cmdstatp->sense_hdr.sense_key == BLANK_CHECK) { | |
b30d8bca HR |
2056 | DEBC_printk(STp, "Zero returned for " |
2057 | "first BLANK CHECK " | |
2058 | "after EOF.\n"); | |
1da177e4 LT |
2059 | STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */ |
2060 | } else /* Some other extended sense code */ | |
2061 | retval = (-EIO); | |
2062 | } | |
2063 | ||
2064 | if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */ | |
2065 | STbp->buffer_bytes = 0; | |
2066 | } | |
b30d8bca | 2067 | /* End of extended sense test */ |
1da177e4 LT |
2068 | else { /* Non-extended sense */ |
2069 | retval = STbp->syscall_result; | |
2070 | } | |
2071 | ||
2072 | } | |
b30d8bca | 2073 | /* End of error handling */ |
40f6b36c | 2074 | else { /* Read successful */ |
1da177e4 | 2075 | STbp->buffer_bytes = bytes; |
40f6b36c KM |
2076 | if (STp->sili) /* In fixed block mode residual is always zero here */ |
2077 | STbp->buffer_bytes -= STp->buffer->cmdstat.residual; | |
2078 | } | |
1da177e4 LT |
2079 | |
2080 | if (STps->drv_block >= 0) { | |
2081 | if (STp->block_size == 0) | |
2082 | STps->drv_block++; | |
2083 | else | |
2084 | STps->drv_block += STbp->buffer_bytes / STp->block_size; | |
2085 | } | |
2086 | return retval; | |
2087 | } | |
2088 | \f | |
2089 | ||
2090 | /* Read command */ | |
2091 | static ssize_t | |
2092 | st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
2093 | { | |
2094 | ssize_t total; | |
2095 | ssize_t retval = 0; | |
2096 | ssize_t i, transfer; | |
2097 | int special, do_dio = 0; | |
8b05b773 | 2098 | struct st_request *SRpnt = NULL; |
1da177e4 LT |
2099 | struct scsi_tape *STp = filp->private_data; |
2100 | struct st_modedef *STm; | |
2101 | struct st_partstat *STps; | |
2102 | struct st_buffer *STbp = STp->buffer; | |
1da177e4 | 2103 | |
28f85009 | 2104 | if (mutex_lock_interruptible(&STp->lock)) |
1da177e4 LT |
2105 | return -ERESTARTSYS; |
2106 | ||
2107 | retval = rw_checks(STp, filp, count); | |
2108 | if (retval || count == 0) | |
2109 | goto out; | |
2110 | ||
2111 | STm = &(STp->modes[STp->current_mode]); | |
9abe16c6 KM |
2112 | if (STp->block_size != 0 && (count % STp->block_size) != 0) { |
2113 | if (!STm->do_read_ahead) { | |
2114 | retval = (-EINVAL); /* Read must be integral number of blocks */ | |
2115 | goto out; | |
2116 | } | |
2117 | STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */ | |
1da177e4 LT |
2118 | } |
2119 | ||
2120 | STps = &(STp->ps[STp->partition]); | |
2121 | if (STps->rw == ST_WRITING) { | |
2122 | retval = flush_buffer(STp, 0); | |
2123 | if (retval) | |
2124 | goto out; | |
2125 | STps->rw = ST_READING; | |
2126 | } | |
b30d8bca | 2127 | DEB( |
1da177e4 | 2128 | if (debugging && STps->eof != ST_NOEOF) |
b30d8bca HR |
2129 | st_printk(ST_DEB_MSG, STp, |
2130 | "EOF/EOM flag up (%d). Bytes %d\n", | |
2131 | STps->eof, STbp->buffer_bytes); | |
2132 | ) /* end DEB */ | |
1da177e4 LT |
2133 | |
2134 | retval = setup_buffering(STp, buf, count, 1); | |
2135 | if (retval) | |
2136 | goto out; | |
2137 | do_dio = STbp->do_dio; | |
2138 | ||
2139 | if (STbp->buffer_bytes == 0 && | |
2140 | STps->eof >= ST_EOD_1) { | |
2141 | if (STps->eof < ST_EOD) { | |
2142 | STps->eof += 1; | |
2143 | retval = 0; | |
2144 | goto out; | |
2145 | } | |
2146 | retval = (-EIO); /* EOM or Blank Check */ | |
2147 | goto out; | |
2148 | } | |
2149 | ||
2150 | if (do_dio) { | |
2151 | /* Check the buffer writability before any tape movement. Don't alter | |
2152 | buffer data. */ | |
2153 | if (copy_from_user(&i, buf, 1) != 0 || | |
2154 | copy_to_user(buf, &i, 1) != 0 || | |
2155 | copy_from_user(&i, buf + count - 1, 1) != 0 || | |
2156 | copy_to_user(buf + count - 1, &i, 1) != 0) { | |
2157 | retval = (-EFAULT); | |
2158 | goto out; | |
2159 | } | |
2160 | } | |
2161 | ||
2162 | STps->rw = ST_READING; | |
2163 | ||
2164 | ||
2165 | /* Loop until enough data in buffer or a special condition found */ | |
2166 | for (total = 0, special = 0; total < count && !special;) { | |
2167 | ||
2168 | /* Get new data if the buffer is empty */ | |
2169 | if (STbp->buffer_bytes == 0) { | |
2170 | special = read_tape(STp, count - total, &SRpnt); | |
2171 | if (special < 0) { /* No need to continue read */ | |
2172 | retval = special; | |
2173 | goto out; | |
2174 | } | |
2175 | } | |
2176 | ||
2177 | /* Move the data from driver buffer to user buffer */ | |
2178 | if (STbp->buffer_bytes > 0) { | |
b30d8bca | 2179 | DEB( |
1da177e4 | 2180 | if (debugging && STps->eof != ST_NOEOF) |
b30d8bca HR |
2181 | st_printk(ST_DEB_MSG, STp, |
2182 | "EOF up (%d). Left %d, needed %d.\n", | |
2183 | STps->eof, STbp->buffer_bytes, | |
2184 | (int)(count - total)); | |
2185 | ) /* end DEB */ | |
1da177e4 LT |
2186 | transfer = STbp->buffer_bytes < count - total ? |
2187 | STbp->buffer_bytes : count - total; | |
2188 | if (!do_dio) { | |
2189 | i = from_buffer(STbp, buf, transfer); | |
2190 | if (i) { | |
2191 | retval = i; | |
2192 | goto out; | |
2193 | } | |
2194 | } | |
2195 | buf += transfer; | |
2196 | total += transfer; | |
2197 | } | |
2198 | ||
2199 | if (STp->block_size == 0) | |
2200 | break; /* Read only one variable length block */ | |
2201 | ||
2202 | } /* for (total = 0, special = 0; | |
2203 | total < count && !special; ) */ | |
2204 | ||
2205 | /* Change the eof state if no data from tape or buffer */ | |
2206 | if (total == 0) { | |
2207 | if (STps->eof == ST_FM_HIT) { | |
2208 | STps->eof = ST_FM; | |
2209 | STps->drv_block = 0; | |
2210 | if (STps->drv_file >= 0) | |
2211 | STps->drv_file++; | |
2212 | } else if (STps->eof == ST_EOD_1) { | |
2213 | STps->eof = ST_EOD_2; | |
2214 | STps->drv_block = 0; | |
2215 | if (STps->drv_file >= 0) | |
2216 | STps->drv_file++; | |
2217 | } else if (STps->eof == ST_EOD_2) | |
2218 | STps->eof = ST_EOD; | |
2219 | } else if (STps->eof == ST_FM) | |
2220 | STps->eof = ST_NOEOF; | |
2221 | retval = total; | |
2222 | ||
2223 | out: | |
2224 | if (SRpnt != NULL) { | |
8b05b773 | 2225 | st_release_request(SRpnt); |
1da177e4 LT |
2226 | SRpnt = NULL; |
2227 | } | |
2228 | if (do_dio) { | |
787926b1 | 2229 | release_buffering(STp, 1); |
1da177e4 LT |
2230 | STbp->buffer_bytes = 0; |
2231 | } | |
28f85009 | 2232 | mutex_unlock(&STp->lock); |
1da177e4 LT |
2233 | |
2234 | return retval; | |
2235 | } | |
2236 | \f | |
2237 | ||
2238 | ||
2239 | DEB( | |
2240 | /* Set the driver options */ | |
b30d8bca | 2241 | static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm) |
1da177e4 LT |
2242 | { |
2243 | if (debugging) { | |
b30d8bca HR |
2244 | st_printk(KERN_INFO, STp, |
2245 | "Mode %d options: buffer writes: %d, " | |
2246 | "async writes: %d, read ahead: %d\n", | |
2247 | STp->current_mode, STm->do_buffer_writes, | |
2248 | STm->do_async_writes, STm->do_read_ahead); | |
2249 | st_printk(KERN_INFO, STp, | |
2250 | " can bsr: %d, two FMs: %d, " | |
2251 | "fast mteom: %d, auto lock: %d,\n", | |
2252 | STp->can_bsr, STp->two_fm, STp->fast_mteom, | |
2253 | STp->do_auto_lock); | |
2254 | st_printk(KERN_INFO, STp, | |
2255 | " defs for wr: %d, no block limits: %d, " | |
2256 | "partitions: %d, s2 log: %d\n", | |
2257 | STm->defaults_for_writes, STp->omit_blklims, | |
2258 | STp->can_partitions, STp->scsi2_logical); | |
2259 | st_printk(KERN_INFO, STp, | |
2260 | " sysv: %d nowait: %d sili: %d " | |
2261 | "nowait_filemark: %d\n", | |
2262 | STm->sysv, STp->immediate, STp->sili, | |
2263 | STp->immediate_filemark); | |
2264 | st_printk(KERN_INFO, STp, " debugging: %d\n", debugging); | |
1da177e4 LT |
2265 | } |
2266 | } | |
2267 | ) | |
2268 | ||
2269 | ||
2270 | static int st_set_options(struct scsi_tape *STp, long options) | |
2271 | { | |
2272 | int value; | |
2273 | long code; | |
2274 | struct st_modedef *STm; | |
1da177e4 | 2275 | struct cdev *cd0, *cd1; |
d6216c47 | 2276 | struct device *d0, *d1; |
1da177e4 LT |
2277 | |
2278 | STm = &(STp->modes[STp->current_mode]); | |
2279 | if (!STm->defined) { | |
d6216c47 ML |
2280 | cd0 = STm->cdevs[0]; |
2281 | cd1 = STm->cdevs[1]; | |
2282 | d0 = STm->devs[0]; | |
2283 | d1 = STm->devs[1]; | |
1da177e4 | 2284 | memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); |
d6216c47 ML |
2285 | STm->cdevs[0] = cd0; |
2286 | STm->cdevs[1] = cd1; | |
2287 | STm->devs[0] = d0; | |
2288 | STm->devs[1] = d1; | |
1da177e4 | 2289 | modes_defined = 1; |
b30d8bca HR |
2290 | DEBC_printk(STp, "Initialized mode %d definition from mode 0\n", |
2291 | STp->current_mode); | |
1da177e4 LT |
2292 | } |
2293 | ||
2294 | code = options & MT_ST_OPTIONS; | |
2295 | if (code == MT_ST_BOOLEANS) { | |
2296 | STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; | |
2297 | STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; | |
2298 | STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; | |
2299 | STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; | |
2300 | STp->two_fm = (options & MT_ST_TWO_FM) != 0; | |
2301 | STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; | |
2302 | STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; | |
2303 | STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; | |
2304 | STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; | |
2305 | if ((STp->device)->scsi_level >= SCSI_2) | |
2306 | STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; | |
2307 | STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; | |
2308 | STp->immediate = (options & MT_ST_NOWAIT) != 0; | |
c743e44f | 2309 | STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0; |
1da177e4 | 2310 | STm->sysv = (options & MT_ST_SYSV) != 0; |
40f6b36c | 2311 | STp->sili = (options & MT_ST_SILI) != 0; |
1da177e4 | 2312 | DEB( debugging = (options & MT_ST_DEBUGGING) != 0; |
b30d8bca | 2313 | st_log_options(STp, STm); ) |
1da177e4 LT |
2314 | } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { |
2315 | value = (code == MT_ST_SETBOOLEANS); | |
2316 | if ((options & MT_ST_BUFFER_WRITES) != 0) | |
2317 | STm->do_buffer_writes = value; | |
2318 | if ((options & MT_ST_ASYNC_WRITES) != 0) | |
2319 | STm->do_async_writes = value; | |
2320 | if ((options & MT_ST_DEF_WRITES) != 0) | |
2321 | STm->defaults_for_writes = value; | |
2322 | if ((options & MT_ST_READ_AHEAD) != 0) | |
2323 | STm->do_read_ahead = value; | |
2324 | if ((options & MT_ST_TWO_FM) != 0) | |
2325 | STp->two_fm = value; | |
2326 | if ((options & MT_ST_FAST_MTEOM) != 0) | |
2327 | STp->fast_mteom = value; | |
2328 | if ((options & MT_ST_AUTO_LOCK) != 0) | |
2329 | STp->do_auto_lock = value; | |
2330 | if ((options & MT_ST_CAN_BSR) != 0) | |
2331 | STp->can_bsr = value; | |
2332 | if ((options & MT_ST_NO_BLKLIMS) != 0) | |
2333 | STp->omit_blklims = value; | |
2334 | if ((STp->device)->scsi_level >= SCSI_2 && | |
2335 | (options & MT_ST_CAN_PARTITIONS) != 0) | |
2336 | STp->can_partitions = value; | |
2337 | if ((options & MT_ST_SCSI2LOGICAL) != 0) | |
2338 | STp->scsi2_logical = value; | |
2339 | if ((options & MT_ST_NOWAIT) != 0) | |
2340 | STp->immediate = value; | |
c743e44f LD |
2341 | if ((options & MT_ST_NOWAIT_EOF) != 0) |
2342 | STp->immediate_filemark = value; | |
1da177e4 LT |
2343 | if ((options & MT_ST_SYSV) != 0) |
2344 | STm->sysv = value; | |
40f6b36c KM |
2345 | if ((options & MT_ST_SILI) != 0) |
2346 | STp->sili = value; | |
b30d8bca | 2347 | DEB( |
1da177e4 LT |
2348 | if ((options & MT_ST_DEBUGGING) != 0) |
2349 | debugging = value; | |
b30d8bca | 2350 | st_log_options(STp, STm); ) |
1da177e4 LT |
2351 | } else if (code == MT_ST_WRITE_THRESHOLD) { |
2352 | /* Retained for compatibility */ | |
2353 | } else if (code == MT_ST_DEF_BLKSIZE) { | |
2354 | value = (options & ~MT_ST_OPTIONS); | |
2355 | if (value == ~MT_ST_OPTIONS) { | |
2356 | STm->default_blksize = (-1); | |
b30d8bca | 2357 | DEBC_printk(STp, "Default block size disabled.\n"); |
1da177e4 LT |
2358 | } else { |
2359 | STm->default_blksize = value; | |
b30d8bca HR |
2360 | DEBC_printk(STp,"Default block size set to " |
2361 | "%d bytes.\n", STm->default_blksize); | |
1da177e4 LT |
2362 | if (STp->ready == ST_READY) { |
2363 | STp->blksize_changed = 0; | |
2364 | set_mode_densblk(STp, STm); | |
2365 | } | |
2366 | } | |
2367 | } else if (code == MT_ST_TIMEOUTS) { | |
2368 | value = (options & ~MT_ST_OPTIONS); | |
2369 | if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { | |
2370 | STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; | |
b30d8bca HR |
2371 | DEBC_printk(STp, "Long timeout set to %d seconds.\n", |
2372 | (value & ~MT_ST_SET_LONG_TIMEOUT)); | |
1da177e4 | 2373 | } else { |
a02488ed JB |
2374 | blk_queue_rq_timeout(STp->device->request_queue, |
2375 | value * HZ); | |
b30d8bca HR |
2376 | DEBC_printk(STp, "Normal timeout set to %d seconds.\n", |
2377 | value); | |
1da177e4 LT |
2378 | } |
2379 | } else if (code == MT_ST_SET_CLN) { | |
2380 | value = (options & ~MT_ST_OPTIONS) & 0xff; | |
2381 | if (value != 0 && | |
832151f4 RK |
2382 | (value < EXTENDED_SENSE_START || |
2383 | value >= SCSI_SENSE_BUFFERSIZE)) | |
1da177e4 LT |
2384 | return (-EINVAL); |
2385 | STp->cln_mode = value; | |
2386 | STp->cln_sense_mask = (options >> 8) & 0xff; | |
2387 | STp->cln_sense_value = (options >> 16) & 0xff; | |
b30d8bca HR |
2388 | st_printk(KERN_INFO, STp, |
2389 | "Cleaning request mode %d, mask %02x, value %02x\n", | |
2390 | value, STp->cln_sense_mask, STp->cln_sense_value); | |
1da177e4 LT |
2391 | } else if (code == MT_ST_DEF_OPTIONS) { |
2392 | code = (options & ~MT_ST_CLEAR_DEFAULT); | |
2393 | value = (options & MT_ST_CLEAR_DEFAULT); | |
2394 | if (code == MT_ST_DEF_DENSITY) { | |
2395 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2396 | STm->default_density = (-1); | |
b30d8bca HR |
2397 | DEBC_printk(STp, |
2398 | "Density default disabled.\n"); | |
1da177e4 LT |
2399 | } else { |
2400 | STm->default_density = value & 0xff; | |
b30d8bca HR |
2401 | DEBC_printk(STp, "Density default set to %x\n", |
2402 | STm->default_density); | |
1da177e4 LT |
2403 | if (STp->ready == ST_READY) { |
2404 | STp->density_changed = 0; | |
2405 | set_mode_densblk(STp, STm); | |
2406 | } | |
2407 | } | |
2408 | } else if (code == MT_ST_DEF_DRVBUFFER) { | |
2409 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2410 | STp->default_drvbuffer = 0xff; | |
b30d8bca HR |
2411 | DEBC_printk(STp, |
2412 | "Drive buffer default disabled.\n"); | |
1da177e4 LT |
2413 | } else { |
2414 | STp->default_drvbuffer = value & 7; | |
b30d8bca HR |
2415 | DEBC_printk(STp, |
2416 | "Drive buffer default set to %x\n", | |
2417 | STp->default_drvbuffer); | |
1da177e4 LT |
2418 | if (STp->ready == ST_READY) |
2419 | st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer); | |
2420 | } | |
2421 | } else if (code == MT_ST_DEF_COMPRESSION) { | |
2422 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2423 | STm->default_compression = ST_DONT_TOUCH; | |
b30d8bca HR |
2424 | DEBC_printk(STp, |
2425 | "Compression default disabled.\n"); | |
1da177e4 LT |
2426 | } else { |
2427 | if ((value & 0xff00) != 0) { | |
2428 | STp->c_algo = (value & 0xff00) >> 8; | |
b30d8bca HR |
2429 | DEBC_printk(STp, "Compression " |
2430 | "algorithm set to 0x%x.\n", | |
2431 | STp->c_algo); | |
1da177e4 LT |
2432 | } |
2433 | if ((value & 0xff) != 0xff) { | |
2434 | STm->default_compression = (value & 1 ? ST_YES : ST_NO); | |
b30d8bca HR |
2435 | DEBC_printk(STp, "Compression default " |
2436 | "set to %x\n", | |
2437 | (value & 1)); | |
1da177e4 LT |
2438 | if (STp->ready == ST_READY) { |
2439 | STp->compression_changed = 0; | |
2440 | st_compression(STp, (STm->default_compression == ST_YES)); | |
2441 | } | |
2442 | } | |
2443 | } | |
2444 | } | |
2445 | } else | |
2446 | return (-EIO); | |
2447 | ||
2448 | return 0; | |
2449 | } | |
2450 | \f | |
2451 | #define MODE_HEADER_LENGTH 4 | |
2452 | ||
2453 | /* Mode header and page byte offsets */ | |
2454 | #define MH_OFF_DATA_LENGTH 0 | |
2455 | #define MH_OFF_MEDIUM_TYPE 1 | |
2456 | #define MH_OFF_DEV_SPECIFIC 2 | |
2457 | #define MH_OFF_BDESCS_LENGTH 3 | |
2458 | #define MP_OFF_PAGE_NBR 0 | |
2459 | #define MP_OFF_PAGE_LENGTH 1 | |
2460 | ||
2461 | /* Mode header and page bit masks */ | |
2462 | #define MH_BIT_WP 0x80 | |
2463 | #define MP_MSK_PAGE_NBR 0x3f | |
2464 | ||
2465 | /* Don't return block descriptors */ | |
2466 | #define MODE_SENSE_OMIT_BDESCS 0x08 | |
2467 | ||
2468 | #define MODE_SELECT_PAGE_FORMAT 0x10 | |
2469 | ||
2470 | /* Read a mode page into the tape buffer. The block descriptors are included | |
2471 | if incl_block_descs is true. The page control is ored to the page number | |
2472 | parameter, if necessary. */ | |
2473 | static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) | |
2474 | { | |
2475 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8ecf0d99 | 2476 | struct st_request *SRpnt; |
1da177e4 LT |
2477 | |
2478 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2479 | cmd[0] = MODE_SENSE; | |
2480 | if (omit_block_descs) | |
2481 | cmd[1] = MODE_SENSE_OMIT_BDESCS; | |
2482 | cmd[2] = page; | |
2483 | cmd[4] = 255; | |
2484 | ||
02ae2c0e KM |
2485 | SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE, |
2486 | STp->device->request_queue->rq_timeout, 0, 1); | |
2487 | if (SRpnt == NULL) | |
2488 | return (STp->buffer)->syscall_result; | |
1da177e4 | 2489 | |
8b05b773 | 2490 | st_release_request(SRpnt); |
1da177e4 | 2491 | |
02ae2c0e | 2492 | return STp->buffer->syscall_result; |
1da177e4 LT |
2493 | } |
2494 | ||
2495 | ||
2496 | /* Send the mode page in the tape buffer to the drive. Assumes that the mode data | |
2497 | in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ | |
2498 | static int write_mode_page(struct scsi_tape *STp, int page, int slow) | |
2499 | { | |
02ae2c0e | 2500 | int pgo; |
1da177e4 | 2501 | unsigned char cmd[MAX_COMMAND_SIZE]; |
18c87015 | 2502 | struct st_request *SRpnt; |
02ae2c0e | 2503 | int timeout; |
1da177e4 LT |
2504 | |
2505 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2506 | cmd[0] = MODE_SELECT; | |
2507 | cmd[1] = MODE_SELECT_PAGE_FORMAT; | |
2508 | pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH]; | |
2509 | cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2; | |
2510 | ||
2511 | /* Clear reserved fields */ | |
2512 | (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0; | |
2513 | (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0; | |
2514 | (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; | |
2515 | (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; | |
2516 | ||
02ae2c0e KM |
2517 | timeout = slow ? |
2518 | STp->long_timeout : STp->device->request_queue->rq_timeout; | |
2519 | SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE, | |
2520 | timeout, 0, 1); | |
2521 | if (SRpnt == NULL) | |
2522 | return (STp->buffer)->syscall_result; | |
1da177e4 | 2523 | |
8b05b773 | 2524 | st_release_request(SRpnt); |
1da177e4 | 2525 | |
02ae2c0e | 2526 | return STp->buffer->syscall_result; |
1da177e4 LT |
2527 | } |
2528 | ||
2529 | ||
2530 | #define COMPRESSION_PAGE 0x0f | |
2531 | #define COMPRESSION_PAGE_LENGTH 16 | |
2532 | ||
2533 | #define CP_OFF_DCE_DCC 2 | |
2534 | #define CP_OFF_C_ALGO 7 | |
2535 | ||
2536 | #define DCE_MASK 0x80 | |
2537 | #define DCC_MASK 0x40 | |
2538 | #define RED_MASK 0x60 | |
2539 | ||
2540 | ||
2541 | /* Control the compression with mode page 15. Algorithm not changed if zero. | |
2542 | ||
2543 | The block descriptors are read and written because Sony SDT-7000 does not | |
2544 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). | |
2545 | Including block descriptors should not cause any harm to other drives. */ | |
2546 | ||
2547 | static int st_compression(struct scsi_tape * STp, int state) | |
2548 | { | |
2549 | int retval; | |
2550 | int mpoffs; /* Offset to mode page start */ | |
2551 | unsigned char *b_data = (STp->buffer)->b_data; | |
1da177e4 LT |
2552 | |
2553 | if (STp->ready != ST_READY) | |
2554 | return (-EIO); | |
2555 | ||
2556 | /* Read the current page contents */ | |
2557 | retval = read_mode_page(STp, COMPRESSION_PAGE, 0); | |
2558 | if (retval) { | |
b30d8bca | 2559 | DEBC_printk(STp, "Compression mode page not supported.\n"); |
1da177e4 LT |
2560 | return (-EIO); |
2561 | } | |
2562 | ||
2563 | mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; | |
b30d8bca HR |
2564 | DEBC_printk(STp, "Compression state is %d.\n", |
2565 | (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0)); | |
1da177e4 LT |
2566 | |
2567 | /* Check if compression can be changed */ | |
2568 | if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) { | |
b30d8bca | 2569 | DEBC_printk(STp, "Compression not supported.\n"); |
1da177e4 LT |
2570 | return (-EIO); |
2571 | } | |
2572 | ||
2573 | /* Do the change */ | |
2574 | if (state) { | |
2575 | b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK; | |
2576 | if (STp->c_algo != 0) | |
2577 | b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo; | |
2578 | } | |
2579 | else { | |
2580 | b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK; | |
2581 | if (STp->c_algo != 0) | |
2582 | b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */ | |
2583 | } | |
2584 | ||
2585 | retval = write_mode_page(STp, COMPRESSION_PAGE, 0); | |
2586 | if (retval) { | |
b30d8bca | 2587 | DEBC_printk(STp, "Compression change failed.\n"); |
1da177e4 LT |
2588 | return (-EIO); |
2589 | } | |
b30d8bca | 2590 | DEBC_printk(STp, "Compression state changed to %d.\n", state); |
1da177e4 LT |
2591 | |
2592 | STp->compression_changed = 1; | |
2593 | return 0; | |
2594 | } | |
2595 | ||
2596 | ||
2597 | /* Process the load and unload commands (does unload if the load code is zero) */ | |
2598 | static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code) | |
2599 | { | |
2600 | int retval = (-EIO), timeout; | |
1da177e4 LT |
2601 | unsigned char cmd[MAX_COMMAND_SIZE]; |
2602 | struct st_partstat *STps; | |
8b05b773 | 2603 | struct st_request *SRpnt; |
1da177e4 LT |
2604 | |
2605 | if (STp->ready != ST_READY && !load_code) { | |
2606 | if (STp->ready == ST_NO_TAPE) | |
2607 | return (-ENOMEDIUM); | |
2608 | else | |
2609 | return (-EIO); | |
2610 | } | |
2611 | ||
2612 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2613 | cmd[0] = START_STOP; | |
2614 | if (load_code) | |
2615 | cmd[4] |= 1; | |
2616 | /* | |
2617 | * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A | |
2618 | */ | |
2619 | if (load_code >= 1 + MT_ST_HPLOADER_OFFSET | |
2620 | && load_code <= 6 + MT_ST_HPLOADER_OFFSET) { | |
b30d8bca HR |
2621 | DEBC_printk(STp, " Enhanced %sload slot %2d.\n", |
2622 | (cmd[4]) ? "" : "un", | |
2623 | load_code - MT_ST_HPLOADER_OFFSET); | |
1da177e4 LT |
2624 | cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ |
2625 | } | |
2626 | if (STp->immediate) { | |
2627 | cmd[1] = 1; /* Don't wait for completion */ | |
a02488ed | 2628 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
2629 | } |
2630 | else | |
2631 | timeout = STp->long_timeout; | |
2632 | ||
2633 | DEBC( | |
2634 | if (!load_code) | |
b30d8bca | 2635 | st_printk(ST_DEB_MSG, STp, "Unloading tape.\n"); |
1da177e4 | 2636 | else |
b30d8bca | 2637 | st_printk(ST_DEB_MSG, STp, "Loading tape.\n"); |
1da177e4 LT |
2638 | ); |
2639 | ||
02ae2c0e KM |
2640 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
2641 | timeout, MAX_RETRIES, 1); | |
1da177e4 | 2642 | if (!SRpnt) |
02ae2c0e | 2643 | return (STp->buffer)->syscall_result; |
1da177e4 LT |
2644 | |
2645 | retval = (STp->buffer)->syscall_result; | |
02ae2c0e | 2646 | st_release_request(SRpnt); |
1da177e4 LT |
2647 | |
2648 | if (!retval) { /* SCSI command successful */ | |
2649 | ||
2650 | if (!load_code) { | |
2651 | STp->rew_at_close = 0; | |
2652 | STp->ready = ST_NO_TAPE; | |
2653 | } | |
2654 | else { | |
2655 | STp->rew_at_close = STp->autorew_dev; | |
2656 | retval = check_tape(STp, filp); | |
2657 | if (retval > 0) | |
2658 | retval = 0; | |
2659 | } | |
2660 | } | |
2661 | else { | |
2662 | STps = &(STp->ps[STp->partition]); | |
2663 | STps->drv_file = STps->drv_block = (-1); | |
2664 | } | |
2665 | ||
2666 | return retval; | |
2667 | } | |
2668 | \f | |
2669 | #if DEBUG | |
2670 | #define ST_DEB_FORWARD 0 | |
2671 | #define ST_DEB_BACKWARD 1 | |
b30d8bca | 2672 | static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) |
1da177e4 LT |
2673 | { |
2674 | s32 sc; | |
2675 | ||
b30d8bca HR |
2676 | if (!debugging) |
2677 | return; | |
2678 | ||
1da177e4 LT |
2679 | sc = cmd[2] & 0x80 ? 0xff000000 : 0; |
2680 | sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; | |
2681 | if (direction) | |
2682 | sc = -sc; | |
b30d8bca HR |
2683 | st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n", |
2684 | direction ? "backward" : "forward", sc, units); | |
1da177e4 | 2685 | } |
b30d8bca HR |
2686 | #else |
2687 | #define ST_DEB_FORWARD 0 | |
2688 | #define ST_DEB_BACKWARD 1 | |
2689 | static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {} | |
1da177e4 LT |
2690 | #endif |
2691 | ||
2692 | ||
2693 | /* Internal ioctl function */ | |
2694 | static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) | |
2695 | { | |
2696 | int timeout; | |
2697 | long ltmp; | |
2698 | int ioctl_result; | |
2699 | int chg_eof = 1; | |
2700 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 2701 | struct st_request *SRpnt; |
1da177e4 LT |
2702 | struct st_partstat *STps; |
2703 | int fileno, blkno, at_sm, undone; | |
2704 | int datalen = 0, direction = DMA_NONE; | |
1da177e4 LT |
2705 | |
2706 | WARN_ON(STp->buffer->do_dio != 0); | |
2707 | if (STp->ready != ST_READY) { | |
2708 | if (STp->ready == ST_NO_TAPE) | |
2709 | return (-ENOMEDIUM); | |
2710 | else | |
2711 | return (-EIO); | |
2712 | } | |
2713 | timeout = STp->long_timeout; | |
2714 | STps = &(STp->ps[STp->partition]); | |
2715 | fileno = STps->drv_file; | |
2716 | blkno = STps->drv_block; | |
2717 | at_sm = STps->at_sm; | |
2718 | ||
2719 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2720 | switch (cmd_in) { | |
2721 | case MTFSFM: | |
2722 | chg_eof = 0; /* Changed from the FSF after this */ | |
2723 | case MTFSF: | |
2724 | cmd[0] = SPACE; | |
2725 | cmd[1] = 0x01; /* Space FileMarks */ | |
2726 | cmd[2] = (arg >> 16); | |
2727 | cmd[3] = (arg >> 8); | |
2728 | cmd[4] = arg; | |
b30d8bca | 2729 | deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd); |
1da177e4 LT |
2730 | if (fileno >= 0) |
2731 | fileno += arg; | |
2732 | blkno = 0; | |
2733 | at_sm &= (arg == 0); | |
2734 | break; | |
2735 | case MTBSFM: | |
2736 | chg_eof = 0; /* Changed from the FSF after this */ | |
2737 | case MTBSF: | |
2738 | cmd[0] = SPACE; | |
2739 | cmd[1] = 0x01; /* Space FileMarks */ | |
2740 | ltmp = (-arg); | |
2741 | cmd[2] = (ltmp >> 16); | |
2742 | cmd[3] = (ltmp >> 8); | |
2743 | cmd[4] = ltmp; | |
b30d8bca | 2744 | deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd); |
1da177e4 LT |
2745 | if (fileno >= 0) |
2746 | fileno -= arg; | |
2747 | blkno = (-1); /* We can't know the block number */ | |
2748 | at_sm &= (arg == 0); | |
2749 | break; | |
2750 | case MTFSR: | |
2751 | cmd[0] = SPACE; | |
2752 | cmd[1] = 0x00; /* Space Blocks */ | |
2753 | cmd[2] = (arg >> 16); | |
2754 | cmd[3] = (arg >> 8); | |
2755 | cmd[4] = arg; | |
b30d8bca | 2756 | deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd); |
1da177e4 LT |
2757 | if (blkno >= 0) |
2758 | blkno += arg; | |
2759 | at_sm &= (arg == 0); | |
2760 | break; | |
2761 | case MTBSR: | |
2762 | cmd[0] = SPACE; | |
2763 | cmd[1] = 0x00; /* Space Blocks */ | |
2764 | ltmp = (-arg); | |
2765 | cmd[2] = (ltmp >> 16); | |
2766 | cmd[3] = (ltmp >> 8); | |
2767 | cmd[4] = ltmp; | |
b30d8bca | 2768 | deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd); |
1da177e4 LT |
2769 | if (blkno >= 0) |
2770 | blkno -= arg; | |
2771 | at_sm &= (arg == 0); | |
2772 | break; | |
2773 | case MTFSS: | |
2774 | cmd[0] = SPACE; | |
2775 | cmd[1] = 0x04; /* Space Setmarks */ | |
2776 | cmd[2] = (arg >> 16); | |
2777 | cmd[3] = (arg >> 8); | |
2778 | cmd[4] = arg; | |
b30d8bca | 2779 | deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd); |
1da177e4 LT |
2780 | if (arg != 0) { |
2781 | blkno = fileno = (-1); | |
2782 | at_sm = 1; | |
2783 | } | |
2784 | break; | |
2785 | case MTBSS: | |
2786 | cmd[0] = SPACE; | |
2787 | cmd[1] = 0x04; /* Space Setmarks */ | |
2788 | ltmp = (-arg); | |
2789 | cmd[2] = (ltmp >> 16); | |
2790 | cmd[3] = (ltmp >> 8); | |
2791 | cmd[4] = ltmp; | |
b30d8bca | 2792 | deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd); |
1da177e4 LT |
2793 | if (arg != 0) { |
2794 | blkno = fileno = (-1); | |
2795 | at_sm = 1; | |
2796 | } | |
2797 | break; | |
2798 | case MTWEOF: | |
3e51d3c9 | 2799 | case MTWEOFI: |
1da177e4 LT |
2800 | case MTWSM: |
2801 | if (STp->write_prot) | |
2802 | return (-EACCES); | |
2803 | cmd[0] = WRITE_FILEMARKS; | |
2804 | if (cmd_in == MTWSM) | |
2805 | cmd[1] = 2; | |
c743e44f LD |
2806 | if (cmd_in == MTWEOFI || |
2807 | (cmd_in == MTWEOF && STp->immediate_filemark)) | |
3e51d3c9 | 2808 | cmd[1] |= 1; |
1da177e4 LT |
2809 | cmd[2] = (arg >> 16); |
2810 | cmd[3] = (arg >> 8); | |
2811 | cmd[4] = arg; | |
a02488ed | 2812 | timeout = STp->device->request_queue->rq_timeout; |
b30d8bca HR |
2813 | DEBC( |
2814 | if (cmd_in != MTWSM) | |
2815 | st_printk(ST_DEB_MSG, STp, | |
2816 | "Writing %d filemarks.\n", | |
2817 | cmd[2] * 65536 + | |
2818 | cmd[3] * 256 + | |
2819 | cmd[4]); | |
2820 | else | |
2821 | st_printk(ST_DEB_MSG, STp, | |
2822 | "Writing %d setmarks.\n", | |
2823 | cmd[2] * 65536 + | |
2824 | cmd[3] * 256 + | |
2825 | cmd[4]); | |
1da177e4 LT |
2826 | ) |
2827 | if (fileno >= 0) | |
2828 | fileno += arg; | |
2829 | blkno = 0; | |
2830 | at_sm = (cmd_in == MTWSM); | |
2831 | break; | |
2832 | case MTREW: | |
2833 | cmd[0] = REZERO_UNIT; | |
2834 | if (STp->immediate) { | |
2835 | cmd[1] = 1; /* Don't wait for completion */ | |
a02488ed | 2836 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 | 2837 | } |
b30d8bca | 2838 | DEBC_printk(STp, "Rewinding tape.\n"); |
1da177e4 LT |
2839 | fileno = blkno = at_sm = 0; |
2840 | break; | |
2841 | case MTNOP: | |
b30d8bca | 2842 | DEBC_printk(STp, "No op on tape.\n"); |
1da177e4 LT |
2843 | return 0; /* Should do something ? */ |
2844 | break; | |
2845 | case MTRETEN: | |
2846 | cmd[0] = START_STOP; | |
2847 | if (STp->immediate) { | |
2848 | cmd[1] = 1; /* Don't wait for completion */ | |
a02488ed | 2849 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
2850 | } |
2851 | cmd[4] = 3; | |
b30d8bca | 2852 | DEBC_printk(STp, "Retensioning tape.\n"); |
1da177e4 LT |
2853 | fileno = blkno = at_sm = 0; |
2854 | break; | |
2855 | case MTEOM: | |
2856 | if (!STp->fast_mteom) { | |
2857 | /* space to the end of tape */ | |
2858 | ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); | |
2859 | fileno = STps->drv_file; | |
2860 | if (STps->eof >= ST_EOD_1) | |
2861 | return 0; | |
2862 | /* The next lines would hide the number of spaced FileMarks | |
2863 | That's why I inserted the previous lines. I had no luck | |
2864 | with detecting EOM with FSF, so we go now to EOM. | |
2865 | Joerg Weule */ | |
2866 | } else | |
2867 | fileno = (-1); | |
2868 | cmd[0] = SPACE; | |
2869 | cmd[1] = 3; | |
b30d8bca | 2870 | DEBC_printk(STp, "Spacing to end of recorded medium.\n"); |
1da177e4 LT |
2871 | blkno = -1; |
2872 | at_sm = 0; | |
2873 | break; | |
2874 | case MTERASE: | |
2875 | if (STp->write_prot) | |
2876 | return (-EACCES); | |
2877 | cmd[0] = ERASE; | |
2878 | cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ | |
2879 | if (STp->immediate) { | |
2880 | cmd[1] |= 2; /* Don't wait for completion */ | |
a02488ed | 2881 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
2882 | } |
2883 | else | |
2884 | timeout = STp->long_timeout * 8; | |
2885 | ||
b30d8bca | 2886 | DEBC_printk(STp, "Erasing tape.\n"); |
1da177e4 LT |
2887 | fileno = blkno = at_sm = 0; |
2888 | break; | |
2889 | case MTSETBLK: /* Set block length */ | |
2890 | case MTSETDENSITY: /* Set tape density */ | |
2891 | case MTSETDRVBUFFER: /* Set drive buffering */ | |
2892 | case SET_DENS_AND_BLK: /* Set density and block size */ | |
2893 | chg_eof = 0; | |
2894 | if (STp->dirty || (STp->buffer)->buffer_bytes != 0) | |
2895 | return (-EIO); /* Not allowed if data in buffer */ | |
2896 | if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && | |
2897 | (arg & MT_ST_BLKSIZE_MASK) != 0 && | |
2898 | STp->max_block > 0 && | |
2899 | ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || | |
2900 | (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { | |
b30d8bca | 2901 | st_printk(KERN_WARNING, STp, "Illegal block size.\n"); |
1da177e4 LT |
2902 | return (-EINVAL); |
2903 | } | |
2904 | cmd[0] = MODE_SELECT; | |
2905 | if ((STp->use_pf & USE_PF)) | |
2906 | cmd[1] = MODE_SELECT_PAGE_FORMAT; | |
2907 | cmd[4] = datalen = 12; | |
2908 | direction = DMA_TO_DEVICE; | |
2909 | ||
2910 | memset((STp->buffer)->b_data, 0, 12); | |
2911 | if (cmd_in == MTSETDRVBUFFER) | |
2912 | (STp->buffer)->b_data[2] = (arg & 7) << 4; | |
2913 | else | |
2914 | (STp->buffer)->b_data[2] = | |
2915 | STp->drv_buffer << 4; | |
2916 | (STp->buffer)->b_data[3] = 8; /* block descriptor length */ | |
2917 | if (cmd_in == MTSETDENSITY) { | |
2918 | (STp->buffer)->b_data[4] = arg; | |
2919 | STp->density_changed = 1; /* At least we tried ;-) */ | |
2920 | } else if (cmd_in == SET_DENS_AND_BLK) | |
2921 | (STp->buffer)->b_data[4] = arg >> 24; | |
2922 | else | |
2923 | (STp->buffer)->b_data[4] = STp->density; | |
2924 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { | |
2925 | ltmp = arg & MT_ST_BLKSIZE_MASK; | |
2926 | if (cmd_in == MTSETBLK) | |
2927 | STp->blksize_changed = 1; /* At least we tried ;-) */ | |
2928 | } else | |
2929 | ltmp = STp->block_size; | |
2930 | (STp->buffer)->b_data[9] = (ltmp >> 16); | |
2931 | (STp->buffer)->b_data[10] = (ltmp >> 8); | |
2932 | (STp->buffer)->b_data[11] = ltmp; | |
a02488ed | 2933 | timeout = STp->device->request_queue->rq_timeout; |
b30d8bca | 2934 | DEBC( |
1da177e4 | 2935 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) |
b30d8bca HR |
2936 | st_printk(ST_DEB_MSG, STp, |
2937 | "Setting block size to %d bytes.\n", | |
2938 | (STp->buffer)->b_data[9] * 65536 + | |
2939 | (STp->buffer)->b_data[10] * 256 + | |
2940 | (STp->buffer)->b_data[11]); | |
1da177e4 | 2941 | if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) |
b30d8bca HR |
2942 | st_printk(ST_DEB_MSG, STp, |
2943 | "Setting density code to %x.\n", | |
2944 | (STp->buffer)->b_data[4]); | |
1da177e4 | 2945 | if (cmd_in == MTSETDRVBUFFER) |
b30d8bca HR |
2946 | st_printk(ST_DEB_MSG, STp, |
2947 | "Setting drive buffer code to %d.\n", | |
2948 | ((STp->buffer)->b_data[2] >> 4) & 7); | |
1da177e4 LT |
2949 | ) |
2950 | break; | |
2951 | default: | |
2952 | return (-ENOSYS); | |
2953 | } | |
2954 | ||
02ae2c0e KM |
2955 | SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, |
2956 | timeout, MAX_RETRIES, 1); | |
1da177e4 LT |
2957 | if (!SRpnt) |
2958 | return (STp->buffer)->syscall_result; | |
2959 | ||
02ae2c0e | 2960 | ioctl_result = (STp->buffer)->syscall_result; |
1da177e4 LT |
2961 | |
2962 | if (!ioctl_result) { /* SCSI command successful */ | |
8b05b773 | 2963 | st_release_request(SRpnt); |
1da177e4 LT |
2964 | SRpnt = NULL; |
2965 | STps->drv_block = blkno; | |
2966 | STps->drv_file = fileno; | |
2967 | STps->at_sm = at_sm; | |
2968 | ||
2969 | if (cmd_in == MTBSFM) | |
2970 | ioctl_result = st_int_ioctl(STp, MTFSF, 1); | |
2971 | else if (cmd_in == MTFSFM) | |
2972 | ioctl_result = st_int_ioctl(STp, MTBSF, 1); | |
2973 | ||
2974 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { | |
1da177e4 LT |
2975 | STp->block_size = arg & MT_ST_BLKSIZE_MASK; |
2976 | if (STp->block_size != 0) { | |
1da177e4 LT |
2977 | (STp->buffer)->buffer_blocks = |
2978 | (STp->buffer)->buffer_size / STp->block_size; | |
2979 | } | |
2980 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; | |
2981 | if (cmd_in == SET_DENS_AND_BLK) | |
2982 | STp->density = arg >> MT_ST_DENSITY_SHIFT; | |
2983 | } else if (cmd_in == MTSETDRVBUFFER) | |
2984 | STp->drv_buffer = (arg & 7); | |
2985 | else if (cmd_in == MTSETDENSITY) | |
2986 | STp->density = arg; | |
2987 | ||
2988 | if (cmd_in == MTEOM) | |
2989 | STps->eof = ST_EOD; | |
2990 | else if (cmd_in == MTFSF) | |
2991 | STps->eof = ST_FM; | |
2992 | else if (chg_eof) | |
2993 | STps->eof = ST_NOEOF; | |
2994 | ||
3e51d3c9 KM |
2995 | if (cmd_in == MTWEOF || cmd_in == MTWEOFI) |
2996 | STps->rw = ST_IDLE; /* prevent automatic WEOF at close */ | |
1da177e4 LT |
2997 | } else { /* SCSI command was not completely successful. Don't return |
2998 | from this block without releasing the SCSI command block! */ | |
2999 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
3000 | ||
3001 | if (cmdstatp->flags & SENSE_EOM) { | |
3002 | if (cmd_in != MTBSF && cmd_in != MTBSFM && | |
3003 | cmd_in != MTBSR && cmd_in != MTBSS) | |
3004 | STps->eof = ST_EOM_OK; | |
3005 | STps->drv_block = 0; | |
3006 | } | |
3007 | ||
3008 | if (cmdstatp->remainder_valid) | |
3009 | undone = (int)cmdstatp->uremainder64; | |
3010 | else | |
3011 | undone = 0; | |
3012 | ||
3e51d3c9 | 3013 | if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) && |
1da177e4 | 3014 | cmdstatp->have_sense && |
91614c05 KM |
3015 | (cmdstatp->flags & SENSE_EOM)) { |
3016 | if (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
3017 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { | |
3018 | ioctl_result = 0; /* EOF(s) written successfully at EOM */ | |
3019 | STps->eof = ST_NOEOF; | |
3020 | } else { /* Writing EOF(s) failed */ | |
3021 | if (fileno >= 0) | |
3022 | fileno -= undone; | |
3023 | if (undone < arg) | |
3024 | STps->eof = ST_NOEOF; | |
3025 | } | |
1da177e4 | 3026 | STps->drv_file = fileno; |
1da177e4 LT |
3027 | } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { |
3028 | if (fileno >= 0) | |
3029 | STps->drv_file = fileno - undone; | |
3030 | else | |
3031 | STps->drv_file = fileno; | |
3032 | STps->drv_block = -1; | |
3033 | STps->eof = ST_NOEOF; | |
3034 | } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { | |
3035 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ | |
3036 | undone = (-undone); | |
3037 | if (STps->drv_file >= 0) | |
3038 | STps->drv_file = fileno + undone; | |
3039 | STps->drv_block = 0; | |
3040 | STps->eof = ST_NOEOF; | |
3041 | } else if (cmd_in == MTFSR) { | |
3042 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ | |
3043 | if (STps->drv_file >= 0) | |
3044 | STps->drv_file++; | |
3045 | STps->drv_block = 0; | |
3046 | STps->eof = ST_FM; | |
3047 | } else { | |
3048 | if (blkno >= undone) | |
3049 | STps->drv_block = blkno - undone; | |
3050 | else | |
3051 | STps->drv_block = (-1); | |
3052 | STps->eof = ST_NOEOF; | |
3053 | } | |
3054 | } else if (cmd_in == MTBSR) { | |
3055 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ | |
3056 | STps->drv_file--; | |
3057 | STps->drv_block = (-1); | |
3058 | } else { | |
3059 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ | |
3060 | undone = (-undone); | |
3061 | if (STps->drv_block >= 0) | |
3062 | STps->drv_block = blkno + undone; | |
3063 | } | |
3064 | STps->eof = ST_NOEOF; | |
3065 | } else if (cmd_in == MTEOM) { | |
3066 | STps->drv_file = (-1); | |
3067 | STps->drv_block = (-1); | |
3068 | STps->eof = ST_EOD; | |
3069 | } else if (cmd_in == MTSETBLK || | |
3070 | cmd_in == MTSETDENSITY || | |
3071 | cmd_in == MTSETDRVBUFFER || | |
3072 | cmd_in == SET_DENS_AND_BLK) { | |
3073 | if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && | |
3074 | !(STp->use_pf & PF_TESTED)) { | |
3075 | /* Try the other possible state of Page Format if not | |
3076 | already tried */ | |
1da2019f | 3077 | STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED; |
8b05b773 | 3078 | st_release_request(SRpnt); |
1da177e4 LT |
3079 | SRpnt = NULL; |
3080 | return st_int_ioctl(STp, cmd_in, arg); | |
3081 | } | |
3082 | } else if (chg_eof) | |
3083 | STps->eof = ST_NOEOF; | |
3084 | ||
3085 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) | |
3086 | STps->eof = ST_EOD; | |
3087 | ||
8b05b773 | 3088 | st_release_request(SRpnt); |
1da177e4 LT |
3089 | SRpnt = NULL; |
3090 | } | |
3091 | ||
3092 | return ioctl_result; | |
3093 | } | |
3094 | \f | |
3095 | ||
3096 | /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc | |
3097 | structure. */ | |
3098 | ||
3099 | static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, | |
3100 | int logical) | |
3101 | { | |
3102 | int result; | |
3103 | unsigned char scmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 3104 | struct st_request *SRpnt; |
1da177e4 LT |
3105 | |
3106 | if (STp->ready != ST_READY) | |
3107 | return (-EIO); | |
3108 | ||
3109 | memset(scmd, 0, MAX_COMMAND_SIZE); | |
3110 | if ((STp->device)->scsi_level < SCSI_2) { | |
3111 | scmd[0] = QFA_REQUEST_BLOCK; | |
3112 | scmd[4] = 3; | |
3113 | } else { | |
3114 | scmd[0] = READ_POSITION; | |
3115 | if (!logical && !STp->scsi2_logical) | |
3116 | scmd[1] = 1; | |
3117 | } | |
02ae2c0e KM |
3118 | SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, |
3119 | STp->device->request_queue->rq_timeout, | |
3120 | MAX_READY_RETRIES, 1); | |
1da177e4 | 3121 | if (!SRpnt) |
02ae2c0e | 3122 | return (STp->buffer)->syscall_result; |
1da177e4 LT |
3123 | |
3124 | if ((STp->buffer)->syscall_result != 0 || | |
3125 | (STp->device->scsi_level >= SCSI_2 && | |
3126 | ((STp->buffer)->b_data[0] & 4) != 0)) { | |
3127 | *block = *partition = 0; | |
b30d8bca | 3128 | DEBC_printk(STp, " Can't read tape position.\n"); |
1da177e4 LT |
3129 | result = (-EIO); |
3130 | } else { | |
3131 | result = 0; | |
3132 | if ((STp->device)->scsi_level < SCSI_2) { | |
3133 | *block = ((STp->buffer)->b_data[0] << 16) | |
3134 | + ((STp->buffer)->b_data[1] << 8) | |
3135 | + (STp->buffer)->b_data[2]; | |
3136 | *partition = 0; | |
3137 | } else { | |
3138 | *block = ((STp->buffer)->b_data[4] << 24) | |
3139 | + ((STp->buffer)->b_data[5] << 16) | |
3140 | + ((STp->buffer)->b_data[6] << 8) | |
3141 | + (STp->buffer)->b_data[7]; | |
3142 | *partition = (STp->buffer)->b_data[1]; | |
3143 | if (((STp->buffer)->b_data[0] & 0x80) && | |
3144 | (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ | |
3145 | STp->ps[0].drv_block = STp->ps[0].drv_file = 0; | |
3146 | } | |
b30d8bca HR |
3147 | DEBC_printk(STp, "Got tape pos. blk %d part %d.\n", |
3148 | *block, *partition); | |
1da177e4 | 3149 | } |
8b05b773 | 3150 | st_release_request(SRpnt); |
1da177e4 LT |
3151 | SRpnt = NULL; |
3152 | ||
3153 | return result; | |
3154 | } | |
3155 | ||
3156 | ||
3157 | /* Set the tape block and partition. Negative partition means that only the | |
3158 | block should be set in vendor specific way. */ | |
3159 | static int set_location(struct scsi_tape *STp, unsigned int block, int partition, | |
3160 | int logical) | |
3161 | { | |
3162 | struct st_partstat *STps; | |
3163 | int result, p; | |
3164 | unsigned int blk; | |
3165 | int timeout; | |
3166 | unsigned char scmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 3167 | struct st_request *SRpnt; |
1da177e4 LT |
3168 | |
3169 | if (STp->ready != ST_READY) | |
3170 | return (-EIO); | |
3171 | timeout = STp->long_timeout; | |
3172 | STps = &(STp->ps[STp->partition]); | |
3173 | ||
b30d8bca HR |
3174 | DEBC_printk(STp, "Setting block to %d and partition to %d.\n", |
3175 | block, partition); | |
1da177e4 LT |
3176 | DEB(if (partition < 0) |
3177 | return (-EIO); ) | |
3178 | ||
3179 | /* Update the location at the partition we are leaving */ | |
3180 | if ((!STp->can_partitions && partition != 0) || | |
3181 | partition >= ST_NBR_PARTITIONS) | |
3182 | return (-EINVAL); | |
3183 | if (partition != STp->partition) { | |
3184 | if (get_location(STp, &blk, &p, 1)) | |
3185 | STps->last_block_valid = 0; | |
3186 | else { | |
3187 | STps->last_block_valid = 1; | |
3188 | STps->last_block_visited = blk; | |
b30d8bca HR |
3189 | DEBC_printk(STp, "Visited block %d for " |
3190 | "partition %d saved.\n", | |
3191 | blk, STp->partition); | |
1da177e4 LT |
3192 | } |
3193 | } | |
3194 | ||
3195 | memset(scmd, 0, MAX_COMMAND_SIZE); | |
3196 | if ((STp->device)->scsi_level < SCSI_2) { | |
3197 | scmd[0] = QFA_SEEK_BLOCK; | |
3198 | scmd[2] = (block >> 16); | |
3199 | scmd[3] = (block >> 8); | |
3200 | scmd[4] = block; | |
3201 | scmd[5] = 0; | |
3202 | } else { | |
3203 | scmd[0] = SEEK_10; | |
3204 | scmd[3] = (block >> 24); | |
3205 | scmd[4] = (block >> 16); | |
3206 | scmd[5] = (block >> 8); | |
3207 | scmd[6] = block; | |
3208 | if (!logical && !STp->scsi2_logical) | |
3209 | scmd[1] = 4; | |
3210 | if (STp->partition != partition) { | |
3211 | scmd[1] |= 2; | |
3212 | scmd[8] = partition; | |
b30d8bca HR |
3213 | DEBC_printk(STp, "Trying to change partition " |
3214 | "from %d to %d\n", STp->partition, | |
3215 | partition); | |
1da177e4 LT |
3216 | } |
3217 | } | |
3218 | if (STp->immediate) { | |
3219 | scmd[1] |= 1; /* Don't wait for completion */ | |
a02488ed | 3220 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
3221 | } |
3222 | ||
02ae2c0e KM |
3223 | SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, |
3224 | timeout, MAX_READY_RETRIES, 1); | |
1da177e4 | 3225 | if (!SRpnt) |
02ae2c0e | 3226 | return (STp->buffer)->syscall_result; |
1da177e4 LT |
3227 | |
3228 | STps->drv_block = STps->drv_file = (-1); | |
3229 | STps->eof = ST_NOEOF; | |
3230 | if ((STp->buffer)->syscall_result != 0) { | |
3231 | result = (-EIO); | |
3232 | if (STp->can_partitions && | |
3233 | (STp->device)->scsi_level >= SCSI_2 && | |
3234 | (p = find_partition(STp)) >= 0) | |
3235 | STp->partition = p; | |
3236 | } else { | |
3237 | if (STp->can_partitions) { | |
3238 | STp->partition = partition; | |
3239 | STps = &(STp->ps[partition]); | |
3240 | if (!STps->last_block_valid || | |
3241 | STps->last_block_visited != block) { | |
3242 | STps->at_sm = 0; | |
3243 | STps->rw = ST_IDLE; | |
3244 | } | |
3245 | } else | |
3246 | STps->at_sm = 0; | |
3247 | if (block == 0) | |
3248 | STps->drv_block = STps->drv_file = 0; | |
3249 | result = 0; | |
3250 | } | |
02ae2c0e | 3251 | |
8b05b773 | 3252 | st_release_request(SRpnt); |
1da177e4 LT |
3253 | SRpnt = NULL; |
3254 | ||
3255 | return result; | |
3256 | } | |
3257 | ||
3258 | ||
3259 | /* Find the current partition number for the drive status. Called from open and | |
3260 | returns either partition number of negative error code. */ | |
3261 | static int find_partition(struct scsi_tape *STp) | |
3262 | { | |
3263 | int i, partition; | |
3264 | unsigned int block; | |
3265 | ||
3266 | if ((i = get_location(STp, &block, &partition, 1)) < 0) | |
3267 | return i; | |
3268 | if (partition >= ST_NBR_PARTITIONS) | |
3269 | return (-EIO); | |
3270 | return partition; | |
3271 | } | |
3272 | ||
3273 | ||
3274 | /* Change the partition if necessary */ | |
3275 | static int switch_partition(struct scsi_tape *STp) | |
3276 | { | |
3277 | struct st_partstat *STps; | |
3278 | ||
3279 | if (STp->partition == STp->new_partition) | |
3280 | return 0; | |
3281 | STps = &(STp->ps[STp->new_partition]); | |
3282 | if (!STps->last_block_valid) | |
3283 | STps->last_block_visited = 0; | |
3284 | return set_location(STp, STps->last_block_visited, STp->new_partition, 1); | |
3285 | } | |
3286 | \f | |
3287 | /* Functions for reading and writing the medium partition mode page. */ | |
3288 | ||
3289 | #define PART_PAGE 0x11 | |
3290 | #define PART_PAGE_FIXED_LENGTH 8 | |
3291 | ||
3292 | #define PP_OFF_MAX_ADD_PARTS 2 | |
3293 | #define PP_OFF_NBR_ADD_PARTS 3 | |
3294 | #define PP_OFF_FLAGS 4 | |
3295 | #define PP_OFF_PART_UNITS 6 | |
3296 | #define PP_OFF_RESERVED 7 | |
3297 | ||
3298 | #define PP_BIT_IDP 0x20 | |
3299 | #define PP_MSK_PSUM_MB 0x10 | |
3300 | ||
3301 | /* Get the number of partitions on the tape. As a side effect reads the | |
3302 | mode page into the tape buffer. */ | |
3303 | static int nbr_partitions(struct scsi_tape *STp) | |
3304 | { | |
3305 | int result; | |
1da177e4 LT |
3306 | |
3307 | if (STp->ready != ST_READY) | |
3308 | return (-EIO); | |
3309 | ||
3310 | result = read_mode_page(STp, PART_PAGE, 1); | |
3311 | ||
3312 | if (result) { | |
b30d8bca | 3313 | DEBC_printk(STp, "Can't read medium partition page.\n"); |
1da177e4 LT |
3314 | result = (-EIO); |
3315 | } else { | |
3316 | result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + | |
3317 | PP_OFF_NBR_ADD_PARTS] + 1; | |
b30d8bca | 3318 | DEBC_printk(STp, "Number of partitions %d.\n", result); |
1da177e4 LT |
3319 | } |
3320 | ||
3321 | return result; | |
3322 | } | |
3323 | ||
3324 | ||
3325 | /* Partition the tape into two partitions if size > 0 or one partition if | |
3326 | size == 0. | |
3327 | ||
3328 | The block descriptors are read and written because Sony SDT-7000 does not | |
3329 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). | |
3330 | ||
3331 | My HP C1533A drive returns only one partition size field. This is used to | |
3332 | set the size of partition 1. There is no size field for the default partition. | |
3333 | Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is | |
3334 | used to set the size of partition 1 (this is what the SCSI-3 standard specifies). | |
3335 | The following algorithm is used to accommodate both drives: if the number of | |
3336 | partition size fields is greater than the maximum number of additional partitions | |
3337 | in the mode page, the second field is used. Otherwise the first field is used. | |
3338 | ||
3339 | For Seagate DDS drives the page length must be 8 when no partitions is defined | |
3340 | and 10 when 1 partition is defined (information from Eric Lee Green). This is | |
3341 | is acceptable also to some other old drives and enforced if the first partition | |
3342 | size field is used for the first additional partition size. | |
3343 | */ | |
3344 | static int partition_tape(struct scsi_tape *STp, int size) | |
3345 | { | |
1da177e4 LT |
3346 | int result; |
3347 | int pgo, psd_cnt, psdo; | |
3348 | unsigned char *bp; | |
3349 | ||
3350 | result = read_mode_page(STp, PART_PAGE, 0); | |
3351 | if (result) { | |
b30d8bca | 3352 | DEBC_printk(STp, "Can't read partition mode page.\n"); |
1da177e4 LT |
3353 | return result; |
3354 | } | |
3355 | /* The mode page is in the buffer. Let's modify it and write it. */ | |
3356 | bp = (STp->buffer)->b_data; | |
3357 | pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; | |
b30d8bca HR |
3358 | DEBC_printk(STp, "Partition page length is %d bytes.\n", |
3359 | bp[pgo + MP_OFF_PAGE_LENGTH] + 2); | |
1da177e4 LT |
3360 | |
3361 | psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; | |
3362 | psdo = pgo + PART_PAGE_FIXED_LENGTH; | |
3363 | if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) { | |
3364 | bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */ | |
3365 | psdo += 2; | |
3366 | } | |
3367 | memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); | |
3368 | ||
b30d8bca | 3369 | DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n", |
1da177e4 | 3370 | psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], |
b30d8bca | 3371 | bp[pgo + PP_OFF_NBR_ADD_PARTS]); |
1da177e4 LT |
3372 | |
3373 | if (size <= 0) { | |
3374 | bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; | |
3375 | if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) | |
3376 | bp[pgo + MP_OFF_PAGE_LENGTH] = 6; | |
b30d8bca | 3377 | DEBC_printk(STp, "Formatting tape with one partition.\n"); |
1da177e4 LT |
3378 | } else { |
3379 | bp[psdo] = (size >> 8) & 0xff; | |
3380 | bp[psdo + 1] = size & 0xff; | |
3381 | bp[pgo + 3] = 1; | |
3382 | if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) | |
3383 | bp[pgo + MP_OFF_PAGE_LENGTH] = 8; | |
b30d8bca HR |
3384 | DEBC_printk(STp, "Formatting tape with two partitions " |
3385 | "(1 = %d MB).\n", size); | |
1da177e4 LT |
3386 | } |
3387 | bp[pgo + PP_OFF_PART_UNITS] = 0; | |
3388 | bp[pgo + PP_OFF_RESERVED] = 0; | |
3389 | bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB; | |
3390 | ||
3391 | result = write_mode_page(STp, PART_PAGE, 1); | |
3392 | if (result) { | |
b30d8bca | 3393 | st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n"); |
1da177e4 LT |
3394 | result = (-EIO); |
3395 | } | |
3396 | ||
3397 | return result; | |
3398 | } | |
3399 | \f | |
3400 | ||
3401 | ||
3402 | /* The ioctl command */ | |
fd66c1b4 | 3403 | static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) |
1da177e4 LT |
3404 | { |
3405 | int i, cmd_nr, cmd_type, bt; | |
3406 | int retval = 0; | |
3407 | unsigned int blk; | |
3408 | struct scsi_tape *STp = file->private_data; | |
3409 | struct st_modedef *STm; | |
3410 | struct st_partstat *STps; | |
1da177e4 LT |
3411 | void __user *p = (void __user *)arg; |
3412 | ||
28f85009 | 3413 | if (mutex_lock_interruptible(&STp->lock)) |
1da177e4 LT |
3414 | return -ERESTARTSYS; |
3415 | ||
b30d8bca | 3416 | DEB( |
1da177e4 | 3417 | if (debugging && !STp->in_use) { |
b30d8bca | 3418 | st_printk(ST_DEB_MSG, STp, "Incorrect device.\n"); |
1da177e4 LT |
3419 | retval = (-EIO); |
3420 | goto out; | |
3421 | } ) /* end DEB */ | |
3422 | ||
3423 | STm = &(STp->modes[STp->current_mode]); | |
3424 | STps = &(STp->ps[STp->partition]); | |
3425 | ||
3426 | /* | |
3427 | * If we are in the middle of error recovery, don't let anyone | |
3428 | * else try and use this device. Also, if error recovery fails, it | |
3429 | * may try and take the device offline, in which case all further | |
3430 | * access to the device is prohibited. | |
3431 | */ | |
906d15fb CH |
3432 | retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in, |
3433 | file->f_flags & O_NDELAY); | |
3434 | if (retval) | |
1da177e4 | 3435 | goto out; |
1da177e4 LT |
3436 | |
3437 | cmd_type = _IOC_TYPE(cmd_in); | |
3438 | cmd_nr = _IOC_NR(cmd_in); | |
3439 | ||
3440 | if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { | |
3441 | struct mtop mtc; | |
3442 | ||
3443 | if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { | |
3444 | retval = (-EINVAL); | |
3445 | goto out; | |
3446 | } | |
3447 | ||
3448 | i = copy_from_user(&mtc, p, sizeof(struct mtop)); | |
3449 | if (i) { | |
3450 | retval = (-EFAULT); | |
3451 | goto out; | |
3452 | } | |
3453 | ||
3454 | if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { | |
b30d8bca HR |
3455 | st_printk(KERN_WARNING, STp, |
3456 | "MTSETDRVBUFFER only allowed for root.\n"); | |
1da177e4 LT |
3457 | retval = (-EPERM); |
3458 | goto out; | |
3459 | } | |
3460 | if (!STm->defined && | |
3461 | (mtc.mt_op != MTSETDRVBUFFER && | |
3462 | (mtc.mt_count & MT_ST_OPTIONS) == 0)) { | |
3463 | retval = (-ENXIO); | |
3464 | goto out; | |
3465 | } | |
3466 | ||
3467 | if (!STp->pos_unknown) { | |
3468 | ||
3469 | if (STps->eof == ST_FM_HIT) { | |
3470 | if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || | |
3471 | mtc.mt_op == MTEOM) { | |
3472 | mtc.mt_count -= 1; | |
3473 | if (STps->drv_file >= 0) | |
3474 | STps->drv_file += 1; | |
3475 | } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { | |
3476 | mtc.mt_count += 1; | |
3477 | if (STps->drv_file >= 0) | |
3478 | STps->drv_file += 1; | |
3479 | } | |
3480 | } | |
3481 | ||
3482 | if (mtc.mt_op == MTSEEK) { | |
3483 | /* Old position must be restored if partition will be | |
3484 | changed */ | |
3485 | i = !STp->can_partitions || | |
3486 | (STp->new_partition != STp->partition); | |
3487 | } else { | |
3488 | i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || | |
3489 | mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || | |
3490 | mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || | |
3491 | mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || | |
3492 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || | |
3493 | mtc.mt_op == MTCOMPRESSION; | |
3494 | } | |
3495 | i = flush_buffer(STp, i); | |
3496 | if (i < 0) { | |
3497 | retval = i; | |
3498 | goto out; | |
3499 | } | |
3500 | if (STps->rw == ST_WRITING && | |
3501 | (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || | |
3502 | mtc.mt_op == MTSEEK || | |
3503 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { | |
3504 | i = st_int_ioctl(STp, MTWEOF, 1); | |
3505 | if (i < 0) { | |
3506 | retval = i; | |
3507 | goto out; | |
3508 | } | |
3509 | if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) | |
3510 | mtc.mt_count++; | |
3511 | STps->rw = ST_IDLE; | |
3512 | } | |
3513 | ||
3514 | } else { | |
3515 | /* | |
3516 | * If there was a bus reset, block further access | |
3517 | * to this device. If the user wants to rewind the tape, | |
3518 | * then reset the flag and allow access again. | |
3519 | */ | |
3520 | if (mtc.mt_op != MTREW && | |
3521 | mtc.mt_op != MTOFFL && | |
3522 | mtc.mt_op != MTRETEN && | |
3523 | mtc.mt_op != MTERASE && | |
3524 | mtc.mt_op != MTSEEK && | |
3525 | mtc.mt_op != MTEOM) { | |
3526 | retval = (-EIO); | |
3527 | goto out; | |
3528 | } | |
3529 | reset_state(STp); | |
3530 | /* remove this when the midlevel properly clears was_reset */ | |
3531 | STp->device->was_reset = 0; | |
3532 | } | |
3533 | ||
3534 | if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && | |
3535 | mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && | |
3536 | mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) | |
3537 | STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ | |
3538 | ||
3539 | if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) | |
3540 | do_door_lock(STp, 0); /* Ignore result! */ | |
3541 | ||
3542 | if (mtc.mt_op == MTSETDRVBUFFER && | |
3543 | (mtc.mt_count & MT_ST_OPTIONS) != 0) { | |
3544 | retval = st_set_options(STp, mtc.mt_count); | |
3545 | goto out; | |
3546 | } | |
3547 | ||
3548 | if (mtc.mt_op == MTSETPART) { | |
3549 | if (!STp->can_partitions || | |
3550 | mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { | |
3551 | retval = (-EINVAL); | |
3552 | goto out; | |
3553 | } | |
3554 | if (mtc.mt_count >= STp->nbr_partitions && | |
3555 | (STp->nbr_partitions = nbr_partitions(STp)) < 0) { | |
3556 | retval = (-EIO); | |
3557 | goto out; | |
3558 | } | |
3559 | if (mtc.mt_count >= STp->nbr_partitions) { | |
3560 | retval = (-EINVAL); | |
3561 | goto out; | |
3562 | } | |
3563 | STp->new_partition = mtc.mt_count; | |
3564 | retval = 0; | |
3565 | goto out; | |
3566 | } | |
3567 | ||
3568 | if (mtc.mt_op == MTMKPART) { | |
3569 | if (!STp->can_partitions) { | |
3570 | retval = (-EINVAL); | |
3571 | goto out; | |
3572 | } | |
3573 | if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 || | |
3574 | (i = partition_tape(STp, mtc.mt_count)) < 0) { | |
3575 | retval = i; | |
3576 | goto out; | |
3577 | } | |
3578 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
3579 | STp->ps[i].rw = ST_IDLE; | |
3580 | STp->ps[i].at_sm = 0; | |
3581 | STp->ps[i].last_block_valid = 0; | |
3582 | } | |
3583 | STp->partition = STp->new_partition = 0; | |
3584 | STp->nbr_partitions = 1; /* Bad guess ?-) */ | |
3585 | STps->drv_block = STps->drv_file = 0; | |
3586 | retval = 0; | |
3587 | goto out; | |
3588 | } | |
3589 | ||
3590 | if (mtc.mt_op == MTSEEK) { | |
3591 | i = set_location(STp, mtc.mt_count, STp->new_partition, 0); | |
3592 | if (!STp->can_partitions) | |
3593 | STp->ps[0].rw = ST_IDLE; | |
3594 | retval = i; | |
3595 | goto out; | |
3596 | } | |
3597 | ||
3598 | if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { | |
3599 | retval = do_load_unload(STp, file, 0); | |
3600 | goto out; | |
3601 | } | |
3602 | ||
3603 | if (mtc.mt_op == MTLOAD) { | |
3604 | retval = do_load_unload(STp, file, max(1, mtc.mt_count)); | |
3605 | goto out; | |
3606 | } | |
3607 | ||
3608 | if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { | |
3609 | retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); | |
3610 | goto out; | |
3611 | } | |
3612 | ||
3613 | if (STp->can_partitions && STp->ready == ST_READY && | |
3614 | (i = switch_partition(STp)) < 0) { | |
3615 | retval = i; | |
3616 | goto out; | |
3617 | } | |
3618 | ||
3619 | if (mtc.mt_op == MTCOMPRESSION) | |
3620 | retval = st_compression(STp, (mtc.mt_count & 1)); | |
3621 | else | |
3622 | retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); | |
3623 | goto out; | |
3624 | } | |
3625 | if (!STm->defined) { | |
3626 | retval = (-ENXIO); | |
3627 | goto out; | |
3628 | } | |
3629 | ||
3630 | if ((i = flush_buffer(STp, 0)) < 0) { | |
3631 | retval = i; | |
3632 | goto out; | |
3633 | } | |
3634 | if (STp->can_partitions && | |
3635 | (i = switch_partition(STp)) < 0) { | |
3636 | retval = i; | |
3637 | goto out; | |
3638 | } | |
3639 | ||
3640 | if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { | |
3641 | struct mtget mt_status; | |
3642 | ||
3643 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { | |
3644 | retval = (-EINVAL); | |
3645 | goto out; | |
3646 | } | |
3647 | ||
3648 | mt_status.mt_type = STp->tape_type; | |
3649 | mt_status.mt_dsreg = | |
3650 | ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | | |
3651 | ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); | |
3652 | mt_status.mt_blkno = STps->drv_block; | |
3653 | mt_status.mt_fileno = STps->drv_file; | |
3654 | if (STp->block_size != 0) { | |
3655 | if (STps->rw == ST_WRITING) | |
3656 | mt_status.mt_blkno += | |
3657 | (STp->buffer)->buffer_bytes / STp->block_size; | |
3658 | else if (STps->rw == ST_READING) | |
3659 | mt_status.mt_blkno -= | |
3660 | ((STp->buffer)->buffer_bytes + | |
3661 | STp->block_size - 1) / STp->block_size; | |
3662 | } | |
3663 | ||
3664 | mt_status.mt_gstat = 0; | |
3665 | if (STp->drv_write_prot) | |
3666 | mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
3667 | if (mt_status.mt_blkno == 0) { | |
3668 | if (mt_status.mt_fileno == 0) | |
3669 | mt_status.mt_gstat |= GMT_BOT(0xffffffff); | |
3670 | else | |
3671 | mt_status.mt_gstat |= GMT_EOF(0xffffffff); | |
3672 | } | |
3673 | mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); | |
3674 | mt_status.mt_resid = STp->partition; | |
3675 | if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) | |
3676 | mt_status.mt_gstat |= GMT_EOT(0xffffffff); | |
3677 | else if (STps->eof >= ST_EOM_OK) | |
3678 | mt_status.mt_gstat |= GMT_EOD(0xffffffff); | |
3679 | if (STp->density == 1) | |
3680 | mt_status.mt_gstat |= GMT_D_800(0xffffffff); | |
3681 | else if (STp->density == 2) | |
3682 | mt_status.mt_gstat |= GMT_D_1600(0xffffffff); | |
3683 | else if (STp->density == 3) | |
3684 | mt_status.mt_gstat |= GMT_D_6250(0xffffffff); | |
3685 | if (STp->ready == ST_READY) | |
3686 | mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); | |
3687 | if (STp->ready == ST_NO_TAPE) | |
3688 | mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); | |
3689 | if (STps->at_sm) | |
3690 | mt_status.mt_gstat |= GMT_SM(0xffffffff); | |
3691 | if (STm->do_async_writes || | |
3692 | (STm->do_buffer_writes && STp->block_size != 0) || | |
3693 | STp->drv_buffer != 0) | |
3694 | mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); | |
3695 | if (STp->cleaning_req) | |
3696 | mt_status.mt_gstat |= GMT_CLN(0xffffffff); | |
3697 | ||
3698 | i = copy_to_user(p, &mt_status, sizeof(struct mtget)); | |
3699 | if (i) { | |
3700 | retval = (-EFAULT); | |
3701 | goto out; | |
3702 | } | |
3703 | ||
3704 | STp->recover_reg = 0; /* Clear after read */ | |
3705 | retval = 0; | |
3706 | goto out; | |
3707 | } /* End of MTIOCGET */ | |
3708 | if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { | |
3709 | struct mtpos mt_pos; | |
3710 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { | |
3711 | retval = (-EINVAL); | |
3712 | goto out; | |
3713 | } | |
3714 | if ((i = get_location(STp, &blk, &bt, 0)) < 0) { | |
3715 | retval = i; | |
3716 | goto out; | |
3717 | } | |
3718 | mt_pos.mt_blkno = blk; | |
3719 | i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); | |
3720 | if (i) | |
3721 | retval = (-EFAULT); | |
3722 | goto out; | |
3723 | } | |
28f85009 | 3724 | mutex_unlock(&STp->lock); |
1da177e4 LT |
3725 | switch (cmd_in) { |
3726 | case SCSI_IOCTL_GET_IDLUN: | |
3727 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
3728 | break; | |
3729 | default: | |
16c4b3e2 KM |
3730 | if ((cmd_in == SG_IO || |
3731 | cmd_in == SCSI_IOCTL_SEND_COMMAND || | |
3732 | cmd_in == CDROM_SEND_PACKET) && | |
3733 | !capable(CAP_SYS_RAWIO)) | |
1da177e4 LT |
3734 | i = -EPERM; |
3735 | else | |
74f3c8af AV |
3736 | i = scsi_cmd_ioctl(STp->disk->queue, STp->disk, |
3737 | file->f_mode, cmd_in, p); | |
1da177e4 LT |
3738 | if (i != -ENOTTY) |
3739 | return i; | |
3740 | break; | |
3741 | } | |
16c4b3e2 KM |
3742 | retval = scsi_ioctl(STp->device, cmd_in, p); |
3743 | if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */ | |
3744 | STp->rew_at_close = 0; | |
3745 | STp->ready = ST_NO_TAPE; | |
3746 | } | |
3747 | return retval; | |
1da177e4 LT |
3748 | |
3749 | out: | |
28f85009 | 3750 | mutex_unlock(&STp->lock); |
1da177e4 LT |
3751 | return retval; |
3752 | } | |
3753 | ||
3754 | #ifdef CONFIG_COMPAT | |
3755 | static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
3756 | { | |
3757 | struct scsi_tape *STp = file->private_data; | |
3758 | struct scsi_device *sdev = STp->device; | |
3759 | int ret = -ENOIOCTLCMD; | |
3760 | if (sdev->host->hostt->compat_ioctl) { | |
3761 | ||
3762 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); | |
3763 | ||
3764 | } | |
3765 | return ret; | |
3766 | } | |
3767 | #endif | |
3768 | ||
3769 | \f | |
3770 | ||
3771 | /* Try to allocate a new tape buffer. Calling function must not hold | |
3772 | dev_arr_lock. */ | |
f409d6cc | 3773 | static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) |
1da177e4 | 3774 | { |
1da177e4 LT |
3775 | struct st_buffer *tb; |
3776 | ||
f409d6cc | 3777 | tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC); |
1da177e4 LT |
3778 | if (!tb) { |
3779 | printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); | |
3780 | return NULL; | |
3781 | } | |
1ac63cf5 | 3782 | tb->frp_segs = 0; |
1da177e4 | 3783 | tb->use_sg = max_sg; |
1da177e4 | 3784 | tb->dma = need_dma; |
f409d6cc | 3785 | tb->buffer_size = 0; |
1da177e4 | 3786 | |
f409d6cc FT |
3787 | tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *), |
3788 | GFP_ATOMIC); | |
d0e1ae31 FT |
3789 | if (!tb->reserved_pages) { |
3790 | kfree(tb); | |
3791 | return NULL; | |
3792 | } | |
3793 | ||
1da177e4 LT |
3794 | return tb; |
3795 | } | |
3796 | ||
3797 | ||
3798 | /* Try to allocate enough space in the tape buffer */ | |
8f78fc5e KM |
3799 | #define ST_MAX_ORDER 6 |
3800 | ||
1da177e4 LT |
3801 | static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) |
3802 | { | |
769989a4 | 3803 | int segs, max_segs, b_size, order, got; |
c53033f6 | 3804 | gfp_t priority; |
1da177e4 LT |
3805 | |
3806 | if (new_size <= STbuffer->buffer_size) | |
3807 | return 1; | |
3808 | ||
3809 | if (STbuffer->buffer_size <= PAGE_SIZE) | |
3810 | normalize_buffer(STbuffer); /* Avoid extra segment */ | |
3811 | ||
3812 | max_segs = STbuffer->use_sg; | |
1da177e4 LT |
3813 | |
3814 | priority = GFP_KERNEL | __GFP_NOWARN; | |
3815 | if (need_dma) | |
3816 | priority |= GFP_DMA; | |
9c905966 | 3817 | |
08c95832 FT |
3818 | if (STbuffer->cleared) |
3819 | priority |= __GFP_ZERO; | |
3820 | ||
9c905966 | 3821 | if (STbuffer->frp_segs) { |
c982c368 | 3822 | order = STbuffer->reserved_page_order; |
08c95832 | 3823 | b_size = PAGE_SIZE << order; |
9c905966 FT |
3824 | } else { |
3825 | for (b_size = PAGE_SIZE, order = 0; | |
46081b16 FT |
3826 | order < ST_MAX_ORDER && |
3827 | max_segs * (PAGE_SIZE << order) < new_size; | |
8f78fc5e | 3828 | order++, b_size *= 2) |
9c905966 | 3829 | ; /* empty */ |
373daacf | 3830 | STbuffer->reserved_page_order = order; |
9c905966 | 3831 | } |
8f78fc5e KM |
3832 | if (max_segs * (PAGE_SIZE << order) < new_size) { |
3833 | if (order == ST_MAX_ORDER) | |
3834 | return 0; | |
3835 | normalize_buffer(STbuffer); | |
3836 | return enlarge_buffer(STbuffer, new_size, need_dma); | |
3837 | } | |
1da177e4 LT |
3838 | |
3839 | for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; | |
3840 | segs < max_segs && got < new_size;) { | |
08c95832 FT |
3841 | struct page *page; |
3842 | ||
3843 | page = alloc_pages(priority, order); | |
3844 | if (!page) { | |
1da177e4 LT |
3845 | DEB(STbuffer->buffer_size = got); |
3846 | normalize_buffer(STbuffer); | |
3847 | return 0; | |
3848 | } | |
08c95832 | 3849 | |
1da177e4 LT |
3850 | STbuffer->frp_segs += 1; |
3851 | got += b_size; | |
3852 | STbuffer->buffer_size = got; | |
08c95832 | 3853 | STbuffer->reserved_pages[segs] = page; |
1da177e4 LT |
3854 | segs++; |
3855 | } | |
08c95832 | 3856 | STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); |
1da177e4 LT |
3857 | |
3858 | return 1; | |
3859 | } | |
3860 | ||
3861 | ||
40f6b36c KM |
3862 | /* Make sure that no data from previous user is in the internal buffer */ |
3863 | static void clear_buffer(struct st_buffer * st_bp) | |
3864 | { | |
3865 | int i; | |
3866 | ||
3867 | for (i=0; i < st_bp->frp_segs; i++) | |
08c95832 | 3868 | memset(page_address(st_bp->reserved_pages[i]), 0, |
c982c368 | 3869 | PAGE_SIZE << st_bp->reserved_page_order); |
40f6b36c KM |
3870 | st_bp->cleared = 1; |
3871 | } | |
3872 | ||
3873 | ||
1da177e4 LT |
3874 | /* Release the extra buffer */ |
3875 | static void normalize_buffer(struct st_buffer * STbuffer) | |
3876 | { | |
c982c368 | 3877 | int i, order = STbuffer->reserved_page_order; |
1da177e4 | 3878 | |
1ac63cf5 | 3879 | for (i = 0; i < STbuffer->frp_segs; i++) { |
08c95832 FT |
3880 | __free_pages(STbuffer->reserved_pages[i], order); |
3881 | STbuffer->buffer_size -= (PAGE_SIZE << order); | |
1da177e4 | 3882 | } |
1ac63cf5 | 3883 | STbuffer->frp_segs = 0; |
8b05b773 | 3884 | STbuffer->sg_segs = 0; |
c982c368 | 3885 | STbuffer->reserved_page_order = 0; |
d0e1ae31 | 3886 | STbuffer->map_data.offset = 0; |
1da177e4 LT |
3887 | } |
3888 | ||
3889 | ||
3890 | /* Move data from the user buffer to the tape buffer. Returns zero (success) or | |
3891 | negative error code. */ | |
3892 | static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) | |
3893 | { | |
3894 | int i, cnt, res, offset; | |
c982c368 | 3895 | int length = PAGE_SIZE << st_bp->reserved_page_order; |
1da177e4 LT |
3896 | |
3897 | for (i = 0, offset = st_bp->buffer_bytes; | |
08c95832 FT |
3898 | i < st_bp->frp_segs && offset >= length; i++) |
3899 | offset -= length; | |
1da177e4 LT |
3900 | if (i == st_bp->frp_segs) { /* Should never happen */ |
3901 | printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); | |
3902 | return (-EIO); | |
3903 | } | |
3904 | for (; i < st_bp->frp_segs && do_count > 0; i++) { | |
08c95832 FT |
3905 | struct page *page = st_bp->reserved_pages[i]; |
3906 | cnt = length - offset < do_count ? length - offset : do_count; | |
3907 | res = copy_from_user(page_address(page) + offset, ubp, cnt); | |
1da177e4 LT |
3908 | if (res) |
3909 | return (-EFAULT); | |
3910 | do_count -= cnt; | |
3911 | st_bp->buffer_bytes += cnt; | |
3912 | ubp += cnt; | |
3913 | offset = 0; | |
3914 | } | |
3915 | if (do_count) /* Should never happen */ | |
3916 | return (-EIO); | |
3917 | ||
3918 | return 0; | |
3919 | } | |
3920 | ||
3921 | ||
3922 | /* Move data from the tape buffer to the user buffer. Returns zero (success) or | |
3923 | negative error code. */ | |
3924 | static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) | |
3925 | { | |
3926 | int i, cnt, res, offset; | |
c982c368 | 3927 | int length = PAGE_SIZE << st_bp->reserved_page_order; |
1da177e4 LT |
3928 | |
3929 | for (i = 0, offset = st_bp->read_pointer; | |
08c95832 FT |
3930 | i < st_bp->frp_segs && offset >= length; i++) |
3931 | offset -= length; | |
1da177e4 LT |
3932 | if (i == st_bp->frp_segs) { /* Should never happen */ |
3933 | printk(KERN_WARNING "st: from_buffer offset overflow.\n"); | |
3934 | return (-EIO); | |
3935 | } | |
3936 | for (; i < st_bp->frp_segs && do_count > 0; i++) { | |
08c95832 FT |
3937 | struct page *page = st_bp->reserved_pages[i]; |
3938 | cnt = length - offset < do_count ? length - offset : do_count; | |
3939 | res = copy_to_user(ubp, page_address(page) + offset, cnt); | |
1da177e4 LT |
3940 | if (res) |
3941 | return (-EFAULT); | |
3942 | do_count -= cnt; | |
3943 | st_bp->buffer_bytes -= cnt; | |
3944 | st_bp->read_pointer += cnt; | |
3945 | ubp += cnt; | |
3946 | offset = 0; | |
3947 | } | |
3948 | if (do_count) /* Should never happen */ | |
3949 | return (-EIO); | |
3950 | ||
3951 | return 0; | |
3952 | } | |
3953 | ||
3954 | ||
3955 | /* Move data towards start of buffer */ | |
3956 | static void move_buffer_data(struct st_buffer * st_bp, int offset) | |
3957 | { | |
3958 | int src_seg, dst_seg, src_offset = 0, dst_offset; | |
3959 | int count, total; | |
c982c368 | 3960 | int length = PAGE_SIZE << st_bp->reserved_page_order; |
1da177e4 LT |
3961 | |
3962 | if (offset == 0) | |
3963 | return; | |
3964 | ||
3965 | total=st_bp->buffer_bytes - offset; | |
3966 | for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { | |
3967 | src_offset = offset; | |
08c95832 | 3968 | if (src_offset < length) |
1da177e4 | 3969 | break; |
08c95832 | 3970 | offset -= length; |
1da177e4 LT |
3971 | } |
3972 | ||
3973 | st_bp->buffer_bytes = st_bp->read_pointer = total; | |
3974 | for (dst_seg=dst_offset=0; total > 0; ) { | |
08c95832 FT |
3975 | struct page *dpage = st_bp->reserved_pages[dst_seg]; |
3976 | struct page *spage = st_bp->reserved_pages[src_seg]; | |
3977 | ||
3978 | count = min(length - dst_offset, length - src_offset); | |
3979 | memmove(page_address(dpage) + dst_offset, | |
3980 | page_address(spage) + src_offset, count); | |
1da177e4 | 3981 | src_offset += count; |
08c95832 | 3982 | if (src_offset >= length) { |
1da177e4 LT |
3983 | src_seg++; |
3984 | src_offset = 0; | |
3985 | } | |
3986 | dst_offset += count; | |
08c95832 | 3987 | if (dst_offset >= length) { |
1da177e4 LT |
3988 | dst_seg++; |
3989 | dst_offset = 0; | |
3990 | } | |
3991 | total -= count; | |
3992 | } | |
3993 | } | |
3994 | ||
1da177e4 LT |
3995 | /* Validate the options from command line or module parameters */ |
3996 | static void validate_options(void) | |
3997 | { | |
3998 | if (buffer_kbs > 0) | |
3999 | st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; | |
4000 | if (max_sg_segs >= ST_FIRST_SG) | |
4001 | st_max_sg_segs = max_sg_segs; | |
4002 | } | |
4003 | ||
4004 | #ifndef MODULE | |
4005 | /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. | |
4006 | */ | |
4007 | static int __init st_setup(char *str) | |
4008 | { | |
4009 | int i, len, ints[5]; | |
4010 | char *stp; | |
4011 | ||
4012 | stp = get_options(str, ARRAY_SIZE(ints), ints); | |
4013 | ||
4014 | if (ints[0] > 0) { | |
4015 | for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) | |
4016 | if (parms[i].val) | |
4017 | *parms[i].val = ints[i + 1]; | |
4018 | } else { | |
4019 | while (stp != NULL) { | |
4020 | for (i = 0; i < ARRAY_SIZE(parms); i++) { | |
4021 | len = strlen(parms[i].name); | |
4022 | if (!strncmp(stp, parms[i].name, len) && | |
4023 | (*(stp + len) == ':' || *(stp + len) == '=')) { | |
4024 | if (parms[i].val) | |
4025 | *parms[i].val = | |
4026 | simple_strtoul(stp + len + 1, NULL, 0); | |
4027 | else | |
4028 | printk(KERN_WARNING "st: Obsolete parameter %s\n", | |
4029 | parms[i].name); | |
4030 | break; | |
4031 | } | |
4032 | } | |
6391a113 | 4033 | if (i >= ARRAY_SIZE(parms)) |
1da177e4 LT |
4034 | printk(KERN_WARNING "st: invalid parameter in '%s'\n", |
4035 | stp); | |
4036 | stp = strchr(stp, ','); | |
4037 | if (stp) | |
4038 | stp++; | |
4039 | } | |
4040 | } | |
4041 | ||
4042 | validate_options(); | |
4043 | ||
4044 | return 1; | |
4045 | } | |
4046 | ||
4047 | __setup("st=", st_setup); | |
4048 | ||
4049 | #endif | |
4050 | ||
00977a59 | 4051 | static const struct file_operations st_fops = |
1da177e4 LT |
4052 | { |
4053 | .owner = THIS_MODULE, | |
4054 | .read = st_read, | |
4055 | .write = st_write, | |
fd66c1b4 | 4056 | .unlocked_ioctl = st_ioctl, |
1da177e4 LT |
4057 | #ifdef CONFIG_COMPAT |
4058 | .compat_ioctl = st_compat_ioctl, | |
4059 | #endif | |
4060 | .open = st_open, | |
4061 | .flush = st_flush, | |
4062 | .release = st_release, | |
b4d878e2 | 4063 | .llseek = noop_llseek, |
1da177e4 LT |
4064 | }; |
4065 | ||
26898afd JM |
4066 | static int create_one_cdev(struct scsi_tape *tape, int mode, int rew) |
4067 | { | |
4068 | int i, error; | |
4069 | dev_t cdev_devno; | |
4070 | struct cdev *cdev; | |
4071 | struct device *dev; | |
4072 | struct st_modedef *STm = &(tape->modes[mode]); | |
4073 | char name[10]; | |
4074 | int dev_num = tape->index; | |
4075 | ||
4076 | cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew)); | |
4077 | ||
4078 | cdev = cdev_alloc(); | |
4079 | if (!cdev) { | |
4080 | pr_err("st%d: out of memory. Device not attached.\n", dev_num); | |
4081 | error = -ENOMEM; | |
4082 | goto out; | |
4083 | } | |
4084 | cdev->owner = THIS_MODULE; | |
4085 | cdev->ops = &st_fops; | |
ab08ee14 | 4086 | STm->cdevs[rew] = cdev; |
26898afd JM |
4087 | |
4088 | error = cdev_add(cdev, cdev_devno, 1); | |
4089 | if (error) { | |
4090 | pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num, | |
4091 | rew ? "non" : "auto", mode); | |
4092 | pr_err("st%d: Device not attached.\n", dev_num); | |
4093 | goto out_free; | |
4094 | } | |
26898afd JM |
4095 | |
4096 | i = mode << (4 - ST_NBR_MODE_BITS); | |
4097 | snprintf(name, 10, "%s%s%s", rew ? "n" : "", | |
4098 | tape->disk->disk_name, st_formats[i]); | |
4099 | ||
4100 | dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev, | |
4101 | cdev_devno, &tape->modes[mode], "%s", name); | |
4102 | if (IS_ERR(dev)) { | |
4103 | pr_err("st%d: device_create failed\n", dev_num); | |
4104 | error = PTR_ERR(dev); | |
4105 | goto out_free; | |
4106 | } | |
4107 | ||
4108 | STm->devs[rew] = dev; | |
4109 | ||
4110 | return 0; | |
4111 | out_free: | |
4112 | cdev_del(STm->cdevs[rew]); | |
26898afd | 4113 | out: |
ab08ee14 ML |
4114 | STm->cdevs[rew] = NULL; |
4115 | STm->devs[rew] = NULL; | |
26898afd JM |
4116 | return error; |
4117 | } | |
4118 | ||
4119 | static int create_cdevs(struct scsi_tape *tape) | |
4120 | { | |
4121 | int mode, error; | |
4122 | for (mode = 0; mode < ST_NBR_MODES; ++mode) { | |
4123 | error = create_one_cdev(tape, mode, 0); | |
4124 | if (error) | |
4125 | return error; | |
4126 | error = create_one_cdev(tape, mode, 1); | |
4127 | if (error) | |
4128 | return error; | |
4129 | } | |
4130 | ||
4131 | return sysfs_create_link(&tape->device->sdev_gendev.kobj, | |
4132 | &tape->modes[0].devs[0]->kobj, "tape"); | |
4133 | } | |
4134 | ||
4135 | static void remove_cdevs(struct scsi_tape *tape) | |
4136 | { | |
4137 | int mode, rew; | |
4138 | sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape"); | |
4139 | for (mode = 0; mode < ST_NBR_MODES; mode++) { | |
4140 | struct st_modedef *STm = &(tape->modes[mode]); | |
4141 | for (rew = 0; rew < 2; rew++) { | |
4142 | if (STm->cdevs[rew]) | |
4143 | cdev_del(STm->cdevs[rew]); | |
4144 | if (STm->devs[rew]) | |
4145 | device_unregister(STm->devs[rew]); | |
4146 | } | |
4147 | } | |
4148 | } | |
4149 | ||
1da177e4 LT |
4150 | static int st_probe(struct device *dev) |
4151 | { | |
4152 | struct scsi_device *SDp = to_scsi_device(dev); | |
4153 | struct gendisk *disk = NULL; | |
1da177e4 LT |
4154 | struct scsi_tape *tpnt = NULL; |
4155 | struct st_modedef *STm; | |
4156 | struct st_partstat *STps; | |
4157 | struct st_buffer *buffer; | |
b98c52b5 | 4158 | int i, error; |
1da177e4 | 4159 | char *stp; |
1da177e4 LT |
4160 | |
4161 | if (SDp->type != TYPE_TAPE) | |
4162 | return -ENODEV; | |
4163 | if ((stp = st_incompatible(SDp))) { | |
3bf743e7 | 4164 | sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n"); |
b30d8bca HR |
4165 | sdev_printk(KERN_INFO, SDp, |
4166 | "st: The suggested driver is %s.\n", stp); | |
1da177e4 LT |
4167 | return -ENODEV; |
4168 | } | |
4169 | ||
6fe8c1db | 4170 | scsi_autopm_get_device(SDp); |
8a78362c | 4171 | i = queue_max_segments(SDp->request_queue); |
1da177e4 LT |
4172 | if (st_max_sg_segs < i) |
4173 | i = st_max_sg_segs; | |
f409d6cc | 4174 | buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i); |
1da177e4 | 4175 | if (buffer == NULL) { |
b30d8bca HR |
4176 | sdev_printk(KERN_ERR, SDp, |
4177 | "st: Can't allocate new tape buffer. " | |
4178 | "Device not attached.\n"); | |
1da177e4 LT |
4179 | goto out; |
4180 | } | |
4181 | ||
4182 | disk = alloc_disk(1); | |
4183 | if (!disk) { | |
b30d8bca HR |
4184 | sdev_printk(KERN_ERR, SDp, |
4185 | "st: out of memory. Device not attached.\n"); | |
1da177e4 LT |
4186 | goto out_buffer_free; |
4187 | } | |
4188 | ||
24669f75 | 4189 | tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC); |
1da177e4 | 4190 | if (tpnt == NULL) { |
b30d8bca HR |
4191 | sdev_printk(KERN_ERR, SDp, |
4192 | "st: Can't allocate device descriptor.\n"); | |
1da177e4 LT |
4193 | goto out_put_disk; |
4194 | } | |
f03a5670 | 4195 | kref_init(&tpnt->kref); |
1da177e4 | 4196 | tpnt->disk = disk; |
1da177e4 LT |
4197 | disk->private_data = &tpnt->driver; |
4198 | disk->queue = SDp->request_queue; | |
2b5bebcc JL |
4199 | /* SCSI tape doesn't register this gendisk via add_disk(). Manually |
4200 | * take queue reference that release_disk() expects. */ | |
4201 | if (!blk_get_queue(disk->queue)) | |
4202 | goto out_put_disk; | |
1da177e4 | 4203 | tpnt->driver = &st_template; |
1da177e4 LT |
4204 | |
4205 | tpnt->device = SDp; | |
4206 | if (SDp->scsi_level <= 2) | |
4207 | tpnt->tape_type = MT_ISSCSI1; | |
4208 | else | |
4209 | tpnt->tape_type = MT_ISSCSI2; | |
4210 | ||
4211 | tpnt->buffer = buffer; | |
f03a5670 | 4212 | tpnt->buffer->last_SRpnt = NULL; |
1da177e4 LT |
4213 | |
4214 | tpnt->inited = 0; | |
4215 | tpnt->dirty = 0; | |
4216 | tpnt->in_use = 0; | |
4217 | tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ | |
4218 | tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; | |
4219 | tpnt->use_pf = (SDp->scsi_level >= SCSI_2); | |
4220 | tpnt->density = 0; | |
4221 | tpnt->do_auto_lock = ST_AUTO_LOCK; | |
4222 | tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ | |
4223 | tpnt->can_partitions = 0; | |
4224 | tpnt->two_fm = ST_TWO_FM; | |
4225 | tpnt->fast_mteom = ST_FAST_MTEOM; | |
4226 | tpnt->scsi2_logical = ST_SCSI2LOGICAL; | |
40f6b36c | 4227 | tpnt->sili = ST_SILI; |
1da177e4 | 4228 | tpnt->immediate = ST_NOWAIT; |
c743e44f | 4229 | tpnt->immediate_filemark = 0; |
1da177e4 LT |
4230 | tpnt->default_drvbuffer = 0xff; /* No forced buffering */ |
4231 | tpnt->partition = 0; | |
4232 | tpnt->new_partition = 0; | |
4233 | tpnt->nbr_partitions = 0; | |
a02488ed | 4234 | blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT); |
1da177e4 LT |
4235 | tpnt->long_timeout = ST_LONG_TIMEOUT; |
4236 | tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; | |
4237 | ||
1da177e4 LT |
4238 | for (i = 0; i < ST_NBR_MODES; i++) { |
4239 | STm = &(tpnt->modes[i]); | |
4240 | STm->defined = 0; | |
4241 | STm->sysv = ST_SYSV; | |
4242 | STm->defaults_for_writes = 0; | |
4243 | STm->do_async_writes = ST_ASYNC_WRITES; | |
4244 | STm->do_buffer_writes = ST_BUFFER_WRITES; | |
4245 | STm->do_read_ahead = ST_READ_AHEAD; | |
4246 | STm->default_compression = ST_DONT_TOUCH; | |
4247 | STm->default_blksize = (-1); /* No forced size */ | |
4248 | STm->default_density = (-1); /* No forced density */ | |
6c648d95 | 4249 | STm->tape = tpnt; |
1da177e4 LT |
4250 | } |
4251 | ||
4252 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
4253 | STps = &(tpnt->ps[i]); | |
4254 | STps->rw = ST_IDLE; | |
4255 | STps->eof = ST_NOEOF; | |
4256 | STps->at_sm = 0; | |
4257 | STps->last_block_valid = 0; | |
4258 | STps->drv_block = (-1); | |
4259 | STps->drv_file = (-1); | |
4260 | } | |
4261 | ||
4262 | tpnt->current_mode = 0; | |
4263 | tpnt->modes[0].defined = 1; | |
4264 | ||
4265 | tpnt->density_changed = tpnt->compression_changed = | |
4266 | tpnt->blksize_changed = 0; | |
28f85009 | 4267 | mutex_init(&tpnt->lock); |
1da177e4 | 4268 | |
b98c52b5 | 4269 | idr_preload(GFP_KERNEL); |
6c648d95 | 4270 | spin_lock(&st_index_lock); |
b98c52b5 | 4271 | error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT); |
6c648d95 | 4272 | spin_unlock(&st_index_lock); |
b98c52b5 TH |
4273 | idr_preload_end(); |
4274 | if (error < 0) { | |
6c648d95 | 4275 | pr_warn("st: idr allocation failed: %d\n", error); |
2b5bebcc | 4276 | goto out_put_queue; |
6c648d95 | 4277 | } |
b98c52b5 TH |
4278 | tpnt->index = error; |
4279 | sprintf(disk->disk_name, "st%d", tpnt->index); | |
05545c92 SS |
4280 | tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL); |
4281 | if (tpnt->stats == NULL) { | |
4282 | sdev_printk(KERN_ERR, SDp, | |
4283 | "st: Can't allocate statistics.\n"); | |
4284 | goto out_idr_remove; | |
4285 | } | |
6c648d95 JM |
4286 | |
4287 | dev_set_drvdata(dev, tpnt); | |
1da177e4 | 4288 | |
1da177e4 | 4289 | |
26898afd JM |
4290 | error = create_cdevs(tpnt); |
4291 | if (error) | |
4292 | goto out_remove_devs; | |
46a243f7 | 4293 | scsi_autopm_put_device(SDp); |
1da177e4 | 4294 | |
42252854 | 4295 | sdev_printk(KERN_NOTICE, SDp, |
8b1ea24c | 4296 | "Attached scsi tape %s\n", tape_name(tpnt)); |
42252854 KM |
4297 | sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n", |
4298 | tape_name(tpnt), tpnt->try_dio ? "yes" : "no", | |
4299 | queue_dma_alignment(SDp->request_queue) + 1); | |
1da177e4 LT |
4300 | |
4301 | return 0; | |
4302 | ||
26898afd JM |
4303 | out_remove_devs: |
4304 | remove_cdevs(tpnt); | |
05545c92 SS |
4305 | kfree(tpnt->stats); |
4306 | out_idr_remove: | |
6c648d95 | 4307 | spin_lock(&st_index_lock); |
b98c52b5 | 4308 | idr_remove(&st_index_idr, tpnt->index); |
6c648d95 | 4309 | spin_unlock(&st_index_lock); |
2b5bebcc JL |
4310 | out_put_queue: |
4311 | blk_put_queue(disk->queue); | |
1da177e4 LT |
4312 | out_put_disk: |
4313 | put_disk(disk); | |
c9475cb0 | 4314 | kfree(tpnt); |
1da177e4 LT |
4315 | out_buffer_free: |
4316 | kfree(buffer); | |
4317 | out: | |
6fe8c1db | 4318 | scsi_autopm_put_device(SDp); |
1da177e4 LT |
4319 | return -ENODEV; |
4320 | }; | |
4321 | ||
4322 | ||
4323 | static int st_remove(struct device *dev) | |
4324 | { | |
6c648d95 | 4325 | struct scsi_tape *tpnt = dev_get_drvdata(dev); |
6c648d95 JM |
4326 | int index = tpnt->index; |
4327 | ||
4328 | scsi_autopm_get_device(to_scsi_device(dev)); | |
26898afd | 4329 | remove_cdevs(tpnt); |
1da177e4 | 4330 | |
6c648d95 JM |
4331 | mutex_lock(&st_ref_mutex); |
4332 | kref_put(&tpnt->kref, scsi_tape_release); | |
4333 | mutex_unlock(&st_ref_mutex); | |
4334 | spin_lock(&st_index_lock); | |
4335 | idr_remove(&st_index_idr, index); | |
4336 | spin_unlock(&st_index_lock); | |
1da177e4 LT |
4337 | return 0; |
4338 | } | |
4339 | ||
f03a5670 KM |
4340 | /** |
4341 | * scsi_tape_release - Called to free the Scsi_Tape structure | |
4342 | * @kref: pointer to embedded kref | |
4343 | * | |
0b950672 | 4344 | * st_ref_mutex must be held entering this routine. Because it is |
f03a5670 KM |
4345 | * called on last put, you should always use the scsi_tape_get() |
4346 | * scsi_tape_put() helpers which manipulate the semaphore directly | |
4347 | * and never do a direct kref_put(). | |
4348 | **/ | |
4349 | static void scsi_tape_release(struct kref *kref) | |
4350 | { | |
4351 | struct scsi_tape *tpnt = to_scsi_tape(kref); | |
4352 | struct gendisk *disk = tpnt->disk; | |
4353 | ||
4354 | tpnt->device = NULL; | |
4355 | ||
4356 | if (tpnt->buffer) { | |
f03a5670 | 4357 | normalize_buffer(tpnt->buffer); |
d0e1ae31 | 4358 | kfree(tpnt->buffer->reserved_pages); |
f03a5670 KM |
4359 | kfree(tpnt->buffer); |
4360 | } | |
4361 | ||
4362 | disk->private_data = NULL; | |
4363 | put_disk(disk); | |
05545c92 | 4364 | kfree(tpnt->stats); |
f03a5670 KM |
4365 | kfree(tpnt); |
4366 | return; | |
4367 | } | |
4368 | ||
af23782b JM |
4369 | static struct class st_sysfs_class = { |
4370 | .name = "scsi_tape", | |
c69c6be5 | 4371 | .dev_groups = st_dev_groups, |
af23782b JM |
4372 | }; |
4373 | ||
1da177e4 LT |
4374 | static int __init init_st(void) |
4375 | { | |
13026a6b JG |
4376 | int err; |
4377 | ||
1da177e4 LT |
4378 | validate_options(); |
4379 | ||
13026a6b | 4380 | printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n", |
1da177e4 LT |
4381 | verstr, st_fixed_buffer_size, st_max_sg_segs); |
4382 | ||
2bec708a LO |
4383 | debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG; |
4384 | if (debugging) { | |
4385 | printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n", | |
4386 | debugging); | |
4387 | } | |
4388 | ||
af23782b JM |
4389 | err = class_register(&st_sysfs_class); |
4390 | if (err) { | |
4391 | pr_err("Unable register sysfs class for SCSI tapes\n"); | |
4392 | return err; | |
1da177e4 LT |
4393 | } |
4394 | ||
13026a6b JG |
4395 | err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), |
4396 | ST_MAX_TAPE_ENTRIES, "st"); | |
4397 | if (err) { | |
4398 | printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", | |
4399 | SCSI_TAPE_MAJOR); | |
4400 | goto err_class; | |
1da177e4 LT |
4401 | } |
4402 | ||
13026a6b JG |
4403 | err = scsi_register_driver(&st_template.gendrv); |
4404 | if (err) | |
4405 | goto err_chrdev; | |
4406 | ||
13026a6b JG |
4407 | return 0; |
4408 | ||
13026a6b JG |
4409 | err_chrdev: |
4410 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), | |
4411 | ST_MAX_TAPE_ENTRIES); | |
4412 | err_class: | |
af23782b | 4413 | class_unregister(&st_sysfs_class); |
13026a6b | 4414 | return err; |
1da177e4 LT |
4415 | } |
4416 | ||
4417 | static void __exit exit_st(void) | |
4418 | { | |
1da177e4 LT |
4419 | scsi_unregister_driver(&st_template.gendrv); |
4420 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), | |
4421 | ST_MAX_TAPE_ENTRIES); | |
af23782b | 4422 | class_unregister(&st_sysfs_class); |
2d3a5d21 | 4423 | idr_destroy(&st_index_idr); |
1da177e4 LT |
4424 | printk(KERN_INFO "st: Unloaded.\n"); |
4425 | } | |
4426 | ||
4427 | module_init(init_st); | |
4428 | module_exit(exit_st); | |
4429 | ||
4430 | ||
4431 | /* The sysfs driver interface. Read-only at the moment */ | |
10978e48 | 4432 | static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf) |
1da177e4 | 4433 | { |
10978e48 | 4434 | return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); |
1da177e4 | 4435 | } |
10978e48 | 4436 | static DRIVER_ATTR_RO(try_direct_io); |
1da177e4 | 4437 | |
10978e48 | 4438 | static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf) |
1da177e4 | 4439 | { |
10978e48 | 4440 | return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); |
1da177e4 | 4441 | } |
10978e48 | 4442 | static DRIVER_ATTR_RO(fixed_buffer_size); |
1da177e4 | 4443 | |
10978e48 | 4444 | static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf) |
1da177e4 | 4445 | { |
10978e48 | 4446 | return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); |
1da177e4 | 4447 | } |
10978e48 | 4448 | static DRIVER_ATTR_RO(max_sg_segs); |
1da177e4 | 4449 | |
10978e48 | 4450 | static ssize_t version_show(struct device_driver *ddd, char *buf) |
1da177e4 | 4451 | { |
10978e48 | 4452 | return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr); |
1da177e4 | 4453 | } |
10978e48 | 4454 | static DRIVER_ATTR_RO(version); |
1da177e4 | 4455 | |
d9b43a10 SS |
4456 | #if DEBUG |
4457 | static ssize_t debug_flag_store(struct device_driver *ddp, | |
4458 | const char *buf, size_t count) | |
4459 | { | |
4460 | /* We only care what the first byte of the data is the rest is unused. | |
4461 | * if it's a '1' we turn on debug and if it's a '0' we disable it. All | |
4462 | * other values have -EINVAL returned if they are passed in. | |
4463 | */ | |
4464 | if (count > 0) { | |
4465 | if (buf[0] == '0') { | |
4466 | debugging = NO_DEBUG; | |
4467 | return count; | |
4468 | } else if (buf[0] == '1') { | |
4469 | debugging = 1; | |
4470 | return count; | |
4471 | } | |
4472 | } | |
4473 | return -EINVAL; | |
4474 | } | |
4475 | ||
4476 | static ssize_t debug_flag_show(struct device_driver *ddp, char *buf) | |
4477 | { | |
4478 | return scnprintf(buf, PAGE_SIZE, "%d\n", debugging); | |
4479 | } | |
4480 | static DRIVER_ATTR_RW(debug_flag); | |
4481 | #endif | |
4482 | ||
442d7562 SS |
4483 | static struct attribute *st_drv_attrs[] = { |
4484 | &driver_attr_try_direct_io.attr, | |
4485 | &driver_attr_fixed_buffer_size.attr, | |
4486 | &driver_attr_max_sg_segs.attr, | |
4487 | &driver_attr_version.attr, | |
d9b43a10 SS |
4488 | #if DEBUG |
4489 | &driver_attr_debug_flag.attr, | |
4490 | #endif | |
442d7562 SS |
4491 | NULL, |
4492 | }; | |
4493 | ATTRIBUTE_GROUPS(st_drv); | |
1da177e4 | 4494 | |
1da177e4 | 4495 | /* The sysfs simple class interface */ |
ee959b00 | 4496 | static ssize_t |
af23782b | 4497 | defined_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 4498 | { |
7d15d6a4 | 4499 | struct st_modedef *STm = dev_get_drvdata(dev); |
1da177e4 LT |
4500 | ssize_t l = 0; |
4501 | ||
4502 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); | |
4503 | return l; | |
4504 | } | |
c69c6be5 | 4505 | static DEVICE_ATTR_RO(defined); |
1da177e4 | 4506 | |
ee959b00 | 4507 | static ssize_t |
af23782b JM |
4508 | default_blksize_show(struct device *dev, struct device_attribute *attr, |
4509 | char *buf) | |
1da177e4 | 4510 | { |
7d15d6a4 | 4511 | struct st_modedef *STm = dev_get_drvdata(dev); |
1da177e4 LT |
4512 | ssize_t l = 0; |
4513 | ||
4514 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); | |
4515 | return l; | |
4516 | } | |
c69c6be5 | 4517 | static DEVICE_ATTR_RO(default_blksize); |
1da177e4 | 4518 | |
ee959b00 | 4519 | static ssize_t |
af23782b JM |
4520 | default_density_show(struct device *dev, struct device_attribute *attr, |
4521 | char *buf) | |
1da177e4 | 4522 | { |
7d15d6a4 | 4523 | struct st_modedef *STm = dev_get_drvdata(dev); |
1da177e4 LT |
4524 | ssize_t l = 0; |
4525 | char *fmt; | |
4526 | ||
4527 | fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; | |
4528 | l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); | |
4529 | return l; | |
4530 | } | |
c69c6be5 | 4531 | static DEVICE_ATTR_RO(default_density); |
1da177e4 | 4532 | |
ee959b00 | 4533 | static ssize_t |
af23782b JM |
4534 | default_compression_show(struct device *dev, struct device_attribute *attr, |
4535 | char *buf) | |
1da177e4 | 4536 | { |
7d15d6a4 | 4537 | struct st_modedef *STm = dev_get_drvdata(dev); |
1da177e4 LT |
4538 | ssize_t l = 0; |
4539 | ||
4540 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); | |
4541 | return l; | |
4542 | } | |
c69c6be5 | 4543 | static DEVICE_ATTR_RO(default_compression); |
1da177e4 | 4544 | |
ee959b00 | 4545 | static ssize_t |
af23782b | 4546 | options_show(struct device *dev, struct device_attribute *attr, char *buf) |
b174be02 | 4547 | { |
7d15d6a4 | 4548 | struct st_modedef *STm = dev_get_drvdata(dev); |
6c648d95 JM |
4549 | struct scsi_tape *STp = STm->tape; |
4550 | int options; | |
b174be02 KM |
4551 | ssize_t l = 0; |
4552 | ||
b174be02 KM |
4553 | options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; |
4554 | options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; | |
4555 | options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; | |
4556 | DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); | |
4557 | options |= STp->two_fm ? MT_ST_TWO_FM : 0; | |
4558 | options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; | |
4559 | options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; | |
4560 | options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; | |
4561 | options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; | |
4562 | options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; | |
4563 | options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; | |
4564 | options |= STm->sysv ? MT_ST_SYSV : 0; | |
4565 | options |= STp->immediate ? MT_ST_NOWAIT : 0; | |
c743e44f | 4566 | options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0; |
b174be02 KM |
4567 | options |= STp->sili ? MT_ST_SILI : 0; |
4568 | ||
4569 | l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); | |
4570 | return l; | |
4571 | } | |
c69c6be5 GKH |
4572 | static DEVICE_ATTR_RO(options); |
4573 | ||
05545c92 SS |
4574 | /* Support for tape stats */ |
4575 | ||
4576 | /** | |
4577 | * read_cnt_show - return read count - count of reads made from tape drive | |
4578 | * @dev: struct device | |
4579 | * @attr: attribute structure | |
4580 | * @buf: buffer to return formatted data in | |
4581 | */ | |
4582 | static ssize_t read_cnt_show(struct device *dev, | |
4583 | struct device_attribute *attr, char *buf) | |
4584 | { | |
4585 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4586 | ||
4587 | return sprintf(buf, "%lld", | |
4588 | (long long)atomic64_read(&STm->tape->stats->read_cnt)); | |
4589 | } | |
4590 | static DEVICE_ATTR_RO(read_cnt); | |
4591 | ||
4592 | /** | |
4593 | * read_byte_cnt_show - return read byte count - tape drives | |
4594 | * may use blocks less than 512 bytes this gives the raw byte count of | |
4595 | * of data read from the tape drive. | |
4596 | * @dev: struct device | |
4597 | * @attr: attribute structure | |
4598 | * @buf: buffer to return formatted data in | |
4599 | */ | |
4600 | static ssize_t read_byte_cnt_show(struct device *dev, | |
4601 | struct device_attribute *attr, char *buf) | |
4602 | { | |
4603 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4604 | ||
4605 | return sprintf(buf, "%lld", | |
4606 | (long long)atomic64_read(&STm->tape->stats->read_byte_cnt)); | |
4607 | } | |
4608 | static DEVICE_ATTR_RO(read_byte_cnt); | |
4609 | ||
4610 | /** | |
4611 | * read_us_show - return read us - overall time spent waiting on reads in ns. | |
4612 | * @dev: struct device | |
4613 | * @attr: attribute structure | |
4614 | * @buf: buffer to return formatted data in | |
4615 | */ | |
4616 | static ssize_t read_ns_show(struct device *dev, | |
4617 | struct device_attribute *attr, char *buf) | |
4618 | { | |
4619 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4620 | ||
4621 | return sprintf(buf, "%lld", | |
4622 | (long long)atomic64_read(&STm->tape->stats->tot_read_time)); | |
4623 | } | |
4624 | static DEVICE_ATTR_RO(read_ns); | |
4625 | ||
4626 | /** | |
4627 | * write_cnt_show - write count - number of user calls | |
4628 | * to write(2) that have written data to tape. | |
4629 | * @dev: struct device | |
4630 | * @attr: attribute structure | |
4631 | * @buf: buffer to return formatted data in | |
4632 | */ | |
4633 | static ssize_t write_cnt_show(struct device *dev, | |
4634 | struct device_attribute *attr, char *buf) | |
4635 | { | |
4636 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4637 | ||
4638 | return sprintf(buf, "%lld", | |
4639 | (long long)atomic64_read(&STm->tape->stats->write_cnt)); | |
4640 | } | |
4641 | static DEVICE_ATTR_RO(write_cnt); | |
4642 | ||
4643 | /** | |
4644 | * write_byte_cnt_show - write byte count - raw count of | |
4645 | * bytes written to tape. | |
4646 | * @dev: struct device | |
4647 | * @attr: attribute structure | |
4648 | * @buf: buffer to return formatted data in | |
4649 | */ | |
4650 | static ssize_t write_byte_cnt_show(struct device *dev, | |
4651 | struct device_attribute *attr, char *buf) | |
4652 | { | |
4653 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4654 | ||
4655 | return sprintf(buf, "%lld", | |
4656 | (long long)atomic64_read(&STm->tape->stats->write_byte_cnt)); | |
4657 | } | |
4658 | static DEVICE_ATTR_RO(write_byte_cnt); | |
4659 | ||
4660 | /** | |
4661 | * write_ns_show - write ns - number of nanoseconds waiting on write | |
4662 | * requests to complete. | |
4663 | * @dev: struct device | |
4664 | * @attr: attribute structure | |
4665 | * @buf: buffer to return formatted data in | |
4666 | */ | |
4667 | static ssize_t write_ns_show(struct device *dev, | |
4668 | struct device_attribute *attr, char *buf) | |
4669 | { | |
4670 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4671 | ||
4672 | return sprintf(buf, "%lld", | |
4673 | (long long)atomic64_read(&STm->tape->stats->tot_write_time)); | |
4674 | } | |
4675 | static DEVICE_ATTR_RO(write_ns); | |
4676 | ||
4677 | /** | |
4678 | * in_flight_show - number of I/Os currently in flight - | |
4679 | * in most cases this will be either 0 or 1. It may be higher if someone | |
4680 | * has also issued other SCSI commands such as via an ioctl. | |
4681 | * @dev: struct device | |
4682 | * @attr: attribute structure | |
4683 | * @buf: buffer to return formatted data in | |
4684 | */ | |
4685 | static ssize_t in_flight_show(struct device *dev, | |
4686 | struct device_attribute *attr, char *buf) | |
4687 | { | |
4688 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4689 | ||
4690 | return sprintf(buf, "%lld", | |
4691 | (long long)atomic64_read(&STm->tape->stats->in_flight)); | |
4692 | } | |
4693 | static DEVICE_ATTR_RO(in_flight); | |
4694 | ||
4695 | /** | |
4696 | * io_ns_show - io wait ns - this is the number of ns spent | |
4697 | * waiting on all I/O to complete. This includes tape movement commands | |
4698 | * such as rewinding, seeking to end of file or tape, it also includes | |
4699 | * read and write. To determine the time spent on tape movement | |
4700 | * subtract the read and write ns from this value. | |
4701 | * @dev: struct device | |
4702 | * @attr: attribute structure | |
4703 | * @buf: buffer to return formatted data in | |
4704 | */ | |
4705 | static ssize_t io_ns_show(struct device *dev, | |
4706 | struct device_attribute *attr, char *buf) | |
4707 | { | |
4708 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4709 | ||
4710 | return sprintf(buf, "%lld", | |
4711 | (long long)atomic64_read(&STm->tape->stats->tot_io_time)); | |
4712 | } | |
4713 | static DEVICE_ATTR_RO(io_ns); | |
4714 | ||
4715 | /** | |
4716 | * other_cnt_show - other io count - this is the number of | |
4717 | * I/O requests other than read and write requests. | |
4718 | * Typically these are tape movement requests but will include driver | |
4719 | * tape movement. This includes only requests issued by the st driver. | |
4720 | * @dev: struct device | |
4721 | * @attr: attribute structure | |
4722 | * @buf: buffer to return formatted data in | |
4723 | */ | |
4724 | static ssize_t other_cnt_show(struct device *dev, | |
4725 | struct device_attribute *attr, char *buf) | |
4726 | { | |
4727 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4728 | ||
4729 | return sprintf(buf, "%lld", | |
4730 | (long long)atomic64_read(&STm->tape->stats->other_cnt)); | |
4731 | } | |
4732 | static DEVICE_ATTR_RO(other_cnt); | |
4733 | ||
4734 | /** | |
4735 | * resid_cnt_show - A count of the number of times we get a residual | |
4736 | * count - this should indicate someone issuing reads larger than the | |
4737 | * block size on tape. | |
4738 | * @dev: struct device | |
4739 | * @attr: attribute structure | |
4740 | * @buf: buffer to return formatted data in | |
4741 | */ | |
4742 | static ssize_t resid_cnt_show(struct device *dev, | |
4743 | struct device_attribute *attr, char *buf) | |
4744 | { | |
4745 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4746 | ||
4747 | return sprintf(buf, "%lld", | |
4748 | (long long)atomic64_read(&STm->tape->stats->resid_cnt)); | |
4749 | } | |
4750 | static DEVICE_ATTR_RO(resid_cnt); | |
4751 | ||
c69c6be5 GKH |
4752 | static struct attribute *st_dev_attrs[] = { |
4753 | &dev_attr_defined.attr, | |
4754 | &dev_attr_default_blksize.attr, | |
4755 | &dev_attr_default_density.attr, | |
4756 | &dev_attr_default_compression.attr, | |
4757 | &dev_attr_options.attr, | |
4758 | NULL, | |
af23782b | 4759 | }; |
05545c92 SS |
4760 | |
4761 | static struct attribute *st_stats_attrs[] = { | |
4762 | &dev_attr_read_cnt.attr, | |
4763 | &dev_attr_read_byte_cnt.attr, | |
4764 | &dev_attr_read_ns.attr, | |
4765 | &dev_attr_write_cnt.attr, | |
4766 | &dev_attr_write_byte_cnt.attr, | |
4767 | &dev_attr_write_ns.attr, | |
4768 | &dev_attr_in_flight.attr, | |
4769 | &dev_attr_io_ns.attr, | |
4770 | &dev_attr_other_cnt.attr, | |
4771 | &dev_attr_resid_cnt.attr, | |
4772 | NULL, | |
4773 | }; | |
4774 | ||
4775 | static struct attribute_group stats_group = { | |
4776 | .name = "stats", | |
4777 | .attrs = st_stats_attrs, | |
4778 | }; | |
4779 | ||
4780 | static struct attribute_group st_group = { | |
4781 | .attrs = st_dev_attrs, | |
4782 | }; | |
4783 | ||
4784 | static const struct attribute_group *st_dev_groups[] = { | |
4785 | &st_group, | |
4786 | &stats_group, | |
4787 | NULL, | |
4788 | }; | |
b174be02 | 4789 | |
1da177e4 | 4790 | /* The following functions may be useful for a larger audience. */ |
6620742f FT |
4791 | static int sgl_map_user_pages(struct st_buffer *STbp, |
4792 | const unsigned int max_pages, unsigned long uaddr, | |
4793 | size_t count, int rw) | |
1da177e4 | 4794 | { |
07542b83 JB |
4795 | unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; |
4796 | unsigned long start = uaddr >> PAGE_SHIFT; | |
4797 | const int nr_pages = end - start; | |
1da177e4 | 4798 | int res, i, j; |
1da177e4 | 4799 | struct page **pages; |
6620742f | 4800 | struct rq_map_data *mdata = &STbp->map_data; |
1da177e4 | 4801 | |
1da177e4 LT |
4802 | /* User attempted Overflow! */ |
4803 | if ((uaddr + count) < uaddr) | |
4804 | return -EINVAL; | |
4805 | ||
4806 | /* Too big */ | |
4807 | if (nr_pages > max_pages) | |
4808 | return -ENOMEM; | |
4809 | ||
4810 | /* Hmm? */ | |
4811 | if (count == 0) | |
4812 | return 0; | |
4813 | ||
4814 | if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL) | |
4815 | return -ENOMEM; | |
4816 | ||
4817 | /* Try to fault in all of the necessary pages */ | |
1da177e4 | 4818 | /* rw==READ means read from drive, write into memory area */ |
7e339128 | 4819 | res = get_user_pages_unlocked( |
1da177e4 LT |
4820 | current, |
4821 | current->mm, | |
4822 | uaddr, | |
4823 | nr_pages, | |
4824 | rw == READ, | |
4825 | 0, /* don't force */ | |
7e339128 | 4826 | pages); |
1da177e4 LT |
4827 | |
4828 | /* Errors and no page mapped should return here */ | |
4829 | if (res < nr_pages) | |
4830 | goto out_unmap; | |
4831 | ||
4832 | for (i=0; i < nr_pages; i++) { | |
4833 | /* FIXME: flush superflous for rw==READ, | |
4834 | * probably wrong function for rw==WRITE | |
4835 | */ | |
4836 | flush_dcache_page(pages[i]); | |
4837 | } | |
4838 | ||
6620742f | 4839 | mdata->offset = uaddr & ~PAGE_MASK; |
6620742f | 4840 | STbp->mapped_pages = pages; |
1da177e4 | 4841 | |
1da177e4 | 4842 | return nr_pages; |
1da177e4 LT |
4843 | out_unmap: |
4844 | if (res > 0) { | |
4845 | for (j=0; j < res; j++) | |
4846 | page_cache_release(pages[j]); | |
6bc733e9 | 4847 | res = 0; |
1da177e4 LT |
4848 | } |
4849 | kfree(pages); | |
4850 | return res; | |
4851 | } | |
4852 | ||
4853 | ||
4854 | /* And unmap them... */ | |
6620742f FT |
4855 | static int sgl_unmap_user_pages(struct st_buffer *STbp, |
4856 | const unsigned int nr_pages, int dirtied) | |
1da177e4 LT |
4857 | { |
4858 | int i; | |
4859 | ||
4860 | for (i=0; i < nr_pages; i++) { | |
6620742f | 4861 | struct page *page = STbp->mapped_pages[i]; |
b5810039 | 4862 | |
b5810039 NP |
4863 | if (dirtied) |
4864 | SetPageDirty(page); | |
1da177e4 LT |
4865 | /* FIXME: cache flush missing for rw==READ |
4866 | * FIXME: call the correct reference counting function | |
4867 | */ | |
b5810039 | 4868 | page_cache_release(page); |
1da177e4 | 4869 | } |
6620742f FT |
4870 | kfree(STbp->mapped_pages); |
4871 | STbp->mapped_pages = NULL; | |
1da177e4 LT |
4872 | |
4873 | return 0; | |
4874 | } |