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[]; |
1da177e4 LT |
88 | |
89 | MODULE_AUTHOR("Kai Makisara"); | |
f018fa55 | 90 | MODULE_DESCRIPTION("SCSI tape (st) driver"); |
1da177e4 | 91 | MODULE_LICENSE("GPL"); |
f018fa55 | 92 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR); |
d7b8bcb0 | 93 | MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE); |
1da177e4 LT |
94 | |
95 | /* Set 'perm' (4th argument) to 0 to disable module_param's definition | |
96 | * of sysfs parameters (which module_param doesn't yet support). | |
97 | * Sysfs parameters defined explicitly later. | |
98 | */ | |
99 | module_param_named(buffer_kbs, buffer_kbs, int, 0); | |
100 | MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)"); | |
101 | module_param_named(max_sg_segs, max_sg_segs, int, 0); | |
102 | MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)"); | |
103 | module_param_named(try_direct_io, try_direct_io, int, 0); | |
104 | MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)"); | |
2bec708a LO |
105 | module_param_named(debug_flag, debug_flag, int, 0); |
106 | MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1"); | |
107 | ||
1da177e4 LT |
108 | |
109 | /* Extra parameters for testing */ | |
110 | module_param_named(try_rdio, try_rdio, int, 0); | |
111 | MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); | |
112 | module_param_named(try_wdio, try_wdio, int, 0); | |
113 | MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); | |
114 | ||
115 | #ifndef MODULE | |
116 | static int write_threshold_kbs; /* retained for compatibility */ | |
117 | static struct st_dev_parm { | |
118 | char *name; | |
119 | int *val; | |
120 | } parms[] __initdata = { | |
121 | { | |
122 | "buffer_kbs", &buffer_kbs | |
123 | }, | |
124 | { /* Retained for compatibility with 2.4 */ | |
125 | "write_threshold_kbs", &write_threshold_kbs | |
126 | }, | |
127 | { | |
128 | "max_sg_segs", NULL | |
129 | }, | |
130 | { | |
131 | "try_direct_io", &try_direct_io | |
2bec708a LO |
132 | }, |
133 | { | |
134 | "debug_flag", &debug_flag | |
1da177e4 LT |
135 | } |
136 | }; | |
137 | #endif | |
138 | ||
139 | /* Restrict the number of modes so that names for all are assigned */ | |
140 | #if ST_NBR_MODES > 16 | |
141 | #error "Maximum number of modes is 16" | |
142 | #endif | |
143 | /* Bit reversed order to get same names for same minors with all | |
144 | mode counts */ | |
0ad78200 | 145 | static const char *st_formats[] = { |
1da177e4 LT |
146 | "", "r", "k", "s", "l", "t", "o", "u", |
147 | "m", "v", "p", "x", "a", "y", "q", "z"}; | |
148 | ||
149 | /* The default definitions have been moved to st_options.h */ | |
150 | ||
151 | #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) | |
152 | ||
153 | /* The buffer size should fit into the 24 bits for length in the | |
154 | 6-byte SCSI read and write commands. */ | |
155 | #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) | |
156 | #error "Buffer size should not exceed (2 << 24 - 1) bytes!" | |
157 | #endif | |
158 | ||
159 | static int debugging = DEBUG; | |
160 | ||
161 | #define MAX_RETRIES 0 | |
162 | #define MAX_WRITE_RETRIES 0 | |
163 | #define MAX_READY_RETRIES 0 | |
164 | #define NO_TAPE NOT_READY | |
165 | ||
166 | #define ST_TIMEOUT (900 * HZ) | |
167 | #define ST_LONG_TIMEOUT (14000 * HZ) | |
168 | ||
169 | /* Remove mode bits and auto-rewind bit (7) */ | |
170 | #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ | |
171 | (iminor(x) & ~(-1 << ST_MODE_SHIFT)) ) | |
172 | #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) | |
173 | ||
174 | /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ | |
175 | #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ | |
176 | (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) | |
177 | ||
178 | /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower | |
179 | 24 bits) */ | |
180 | #define SET_DENS_AND_BLK 0x10001 | |
181 | ||
1da177e4 LT |
182 | static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; |
183 | static int st_max_sg_segs = ST_MAX_SG; | |
184 | ||
1da177e4 LT |
185 | static int modes_defined; |
186 | ||
1da177e4 | 187 | static int enlarge_buffer(struct st_buffer *, int, int); |
40f6b36c | 188 | static void clear_buffer(struct st_buffer *); |
1da177e4 LT |
189 | static void normalize_buffer(struct st_buffer *); |
190 | static int append_to_buffer(const char __user *, struct st_buffer *, int); | |
191 | static int from_buffer(struct st_buffer *, char __user *, int); | |
192 | static void move_buffer_data(struct st_buffer *, int); | |
1da177e4 | 193 | |
6620742f | 194 | static int sgl_map_user_pages(struct st_buffer *, const unsigned int, |
1da177e4 | 195 | unsigned long, size_t, int); |
6620742f | 196 | static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int); |
1da177e4 LT |
197 | |
198 | static int st_probe(struct device *); | |
199 | static int st_remove(struct device *); | |
1da177e4 | 200 | |
405ae7d3 RD |
201 | static int do_create_sysfs_files(void); |
202 | static void do_remove_sysfs_files(void); | |
1da177e4 LT |
203 | |
204 | static struct scsi_driver st_template = { | |
1da177e4 LT |
205 | .gendrv = { |
206 | .name = "st", | |
3af6b352 | 207 | .owner = THIS_MODULE, |
1da177e4 LT |
208 | .probe = st_probe, |
209 | .remove = st_remove, | |
210 | }, | |
1da177e4 LT |
211 | }; |
212 | ||
213 | static int st_compression(struct scsi_tape *, int); | |
214 | ||
215 | static int find_partition(struct scsi_tape *); | |
216 | static int switch_partition(struct scsi_tape *); | |
217 | ||
218 | static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); | |
219 | ||
f03a5670 KM |
220 | static void scsi_tape_release(struct kref *); |
221 | ||
222 | #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref) | |
223 | ||
0b950672 | 224 | static DEFINE_MUTEX(st_ref_mutex); |
6c648d95 JM |
225 | static DEFINE_SPINLOCK(st_index_lock); |
226 | static DEFINE_SPINLOCK(st_use_lock); | |
227 | static DEFINE_IDR(st_index_idr); | |
228 | ||
f03a5670 | 229 | |
1da177e4 LT |
230 | \f |
231 | #include "osst_detect.h" | |
232 | #ifndef SIGS_FROM_OSST | |
233 | #define SIGS_FROM_OSST \ | |
234 | {"OnStream", "SC-", "", "osst"}, \ | |
235 | {"OnStream", "DI-", "", "osst"}, \ | |
236 | {"OnStream", "DP-", "", "osst"}, \ | |
237 | {"OnStream", "USB", "", "osst"}, \ | |
238 | {"OnStream", "FW-", "", "osst"} | |
239 | #endif | |
240 | ||
f03a5670 KM |
241 | static struct scsi_tape *scsi_tape_get(int dev) |
242 | { | |
243 | struct scsi_tape *STp = NULL; | |
244 | ||
0b950672 | 245 | mutex_lock(&st_ref_mutex); |
6c648d95 | 246 | spin_lock(&st_index_lock); |
f03a5670 | 247 | |
6c648d95 | 248 | STp = idr_find(&st_index_idr, dev); |
f03a5670 KM |
249 | if (!STp) goto out; |
250 | ||
251 | kref_get(&STp->kref); | |
252 | ||
253 | if (!STp->device) | |
254 | goto out_put; | |
255 | ||
256 | if (scsi_device_get(STp->device)) | |
257 | goto out_put; | |
258 | ||
259 | goto out; | |
260 | ||
261 | out_put: | |
262 | kref_put(&STp->kref, scsi_tape_release); | |
263 | STp = NULL; | |
264 | out: | |
6c648d95 | 265 | spin_unlock(&st_index_lock); |
0b950672 | 266 | mutex_unlock(&st_ref_mutex); |
f03a5670 KM |
267 | return STp; |
268 | } | |
269 | ||
270 | static void scsi_tape_put(struct scsi_tape *STp) | |
271 | { | |
272 | struct scsi_device *sdev = STp->device; | |
273 | ||
0b950672 | 274 | mutex_lock(&st_ref_mutex); |
f03a5670 KM |
275 | kref_put(&STp->kref, scsi_tape_release); |
276 | scsi_device_put(sdev); | |
0b950672 | 277 | mutex_unlock(&st_ref_mutex); |
f03a5670 KM |
278 | } |
279 | ||
1da177e4 LT |
280 | struct st_reject_data { |
281 | char *vendor; | |
282 | char *model; | |
283 | char *rev; | |
284 | char *driver_hint; /* Name of the correct driver, NULL if unknown */ | |
285 | }; | |
286 | ||
287 | static struct st_reject_data reject_list[] = { | |
288 | /* {"XXX", "Yy-", "", NULL}, example */ | |
289 | SIGS_FROM_OSST, | |
290 | {NULL, }}; | |
291 | ||
292 | /* If the device signature is on the list of incompatible drives, the | |
293 | function returns a pointer to the name of the correct driver (if known) */ | |
294 | static char * st_incompatible(struct scsi_device* SDp) | |
295 | { | |
296 | struct st_reject_data *rp; | |
297 | ||
298 | for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) | |
299 | if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && | |
300 | !strncmp(rp->model, SDp->model, strlen(rp->model)) && | |
301 | !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { | |
302 | if (rp->driver_hint) | |
303 | return rp->driver_hint; | |
304 | else | |
305 | return "unknown"; | |
306 | } | |
307 | return NULL; | |
308 | } | |
309 | \f | |
310 | ||
311 | static inline char *tape_name(struct scsi_tape *tape) | |
312 | { | |
313 | return tape->disk->disk_name; | |
314 | } | |
315 | ||
b30d8bca | 316 | #define st_printk(prefix, t, fmt, a...) \ |
22e0d994 | 317 | sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a) |
b30d8bca HR |
318 | #ifdef DEBUG |
319 | #define DEBC_printk(t, fmt, a...) \ | |
320 | if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); } | |
321 | #else | |
322 | #define DEBC_printk(t, fmt, a...) | |
323 | #endif | |
1da177e4 | 324 | |
8b05b773 | 325 | static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s) |
1da177e4 LT |
326 | { |
327 | const u8 *ucp; | |
8b05b773 | 328 | const u8 *sense = SRpnt->sense; |
1da177e4 | 329 | |
8b05b773 MC |
330 | s->have_sense = scsi_normalize_sense(SRpnt->sense, |
331 | SCSI_SENSE_BUFFERSIZE, &s->sense_hdr); | |
1da177e4 LT |
332 | s->flags = 0; |
333 | ||
334 | if (s->have_sense) { | |
335 | s->deferred = 0; | |
336 | s->remainder_valid = | |
337 | scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); | |
338 | switch (sense[0] & 0x7f) { | |
339 | case 0x71: | |
340 | s->deferred = 1; | |
341 | case 0x70: | |
342 | s->fixed_format = 1; | |
343 | s->flags = sense[2] & 0xe0; | |
344 | break; | |
345 | case 0x73: | |
346 | s->deferred = 1; | |
347 | case 0x72: | |
348 | s->fixed_format = 0; | |
349 | ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); | |
350 | s->flags = ucp ? (ucp[3] & 0xe0) : 0; | |
351 | break; | |
352 | } | |
353 | } | |
354 | } | |
355 | ||
356 | ||
357 | /* Convert the result to success code */ | |
8b05b773 | 358 | static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt) |
1da177e4 | 359 | { |
8b05b773 | 360 | int result = SRpnt->result; |
1da177e4 LT |
361 | u8 scode; |
362 | DEB(const char *stp;) | |
363 | char *name = tape_name(STp); | |
364 | struct st_cmdstatus *cmdstatp; | |
365 | ||
366 | if (!result) | |
367 | return 0; | |
368 | ||
369 | cmdstatp = &STp->buffer->cmdstat; | |
f03a5670 | 370 | st_analyze_sense(SRpnt, cmdstatp); |
1da177e4 LT |
371 | |
372 | if (cmdstatp->have_sense) | |
373 | scode = STp->buffer->cmdstat.sense_hdr.sense_key; | |
374 | else | |
375 | scode = 0; | |
376 | ||
b30d8bca HR |
377 | DEB( |
378 | if (debugging) { | |
379 | st_printk(ST_DEB_MSG, STp, | |
380 | "Error: %x, cmd: %x %x %x %x %x %x\n", result, | |
381 | SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2], | |
382 | SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]); | |
1da177e4 | 383 | if (cmdstatp->have_sense) |
d811b848 HR |
384 | __scsi_print_sense(STp->device, name, |
385 | SRpnt->sense, SCSI_SENSE_BUFFERSIZE); | |
1da177e4 LT |
386 | } ) /* end DEB */ |
387 | if (!debugging) { /* Abnormal conditions for tape */ | |
388 | if (!cmdstatp->have_sense) | |
b30d8bca HR |
389 | st_printk(KERN_WARNING, STp, |
390 | "Error %x (driver bt 0x%x, host bt 0x%x).\n", | |
391 | result, driver_byte(result), host_byte(result)); | |
1da177e4 LT |
392 | else if (cmdstatp->have_sense && |
393 | scode != NO_SENSE && | |
394 | scode != RECOVERED_ERROR && | |
395 | /* scode != UNIT_ATTENTION && */ | |
396 | scode != BLANK_CHECK && | |
397 | scode != VOLUME_OVERFLOW && | |
8b05b773 MC |
398 | SRpnt->cmd[0] != MODE_SENSE && |
399 | SRpnt->cmd[0] != TEST_UNIT_READY) { | |
4e73ea7b | 400 | |
d811b848 HR |
401 | __scsi_print_sense(STp->device, name, |
402 | SRpnt->sense, SCSI_SENSE_BUFFERSIZE); | |
1da177e4 LT |
403 | } |
404 | } | |
405 | ||
406 | if (cmdstatp->fixed_format && | |
407 | STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ | |
408 | if (STp->cln_sense_value) | |
8b05b773 | 409 | STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & |
1da177e4 LT |
410 | STp->cln_sense_mask) == STp->cln_sense_value); |
411 | else | |
8b05b773 | 412 | STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & |
1da177e4 LT |
413 | STp->cln_sense_mask) != 0); |
414 | } | |
415 | if (cmdstatp->have_sense && | |
416 | cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17) | |
417 | STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */ | |
418 | ||
419 | STp->pos_unknown |= STp->device->was_reset; | |
420 | ||
421 | if (cmdstatp->have_sense && | |
422 | scode == RECOVERED_ERROR | |
423 | #if ST_RECOVERED_WRITE_FATAL | |
8b05b773 MC |
424 | && SRpnt->cmd[0] != WRITE_6 |
425 | && SRpnt->cmd[0] != WRITE_FILEMARKS | |
1da177e4 LT |
426 | #endif |
427 | ) { | |
428 | STp->recover_count++; | |
429 | STp->recover_reg++; | |
430 | ||
b30d8bca | 431 | DEB( |
1da177e4 | 432 | if (debugging) { |
8b05b773 | 433 | if (SRpnt->cmd[0] == READ_6) |
1da177e4 | 434 | stp = "read"; |
8b05b773 | 435 | else if (SRpnt->cmd[0] == WRITE_6) |
1da177e4 LT |
436 | stp = "write"; |
437 | else | |
438 | stp = "ioctl"; | |
b30d8bca HR |
439 | st_printk(ST_DEB_MSG, STp, |
440 | "Recovered %s error (%d).\n", | |
441 | stp, STp->recover_count); | |
1da177e4 LT |
442 | } ) /* end DEB */ |
443 | ||
444 | if (cmdstatp->flags == 0) | |
445 | return 0; | |
446 | } | |
447 | return (-EIO); | |
448 | } | |
449 | ||
4deba245 | 450 | static struct st_request *st_allocate_request(struct scsi_tape *stp) |
8b05b773 | 451 | { |
4deba245 FT |
452 | struct st_request *streq; |
453 | ||
454 | streq = kzalloc(sizeof(*streq), GFP_KERNEL); | |
455 | if (streq) | |
456 | streq->stp = stp; | |
457 | else { | |
b30d8bca HR |
458 | st_printk(KERN_ERR, stp, |
459 | "Can't get SCSI request.\n"); | |
4deba245 FT |
460 | if (signal_pending(current)) |
461 | stp->buffer->syscall_result = -EINTR; | |
462 | else | |
463 | stp->buffer->syscall_result = -EBUSY; | |
464 | } | |
465 | ||
466 | return streq; | |
8b05b773 MC |
467 | } |
468 | ||
469 | static void st_release_request(struct st_request *streq) | |
470 | { | |
471 | kfree(streq); | |
1da177e4 LT |
472 | } |
473 | ||
05545c92 SS |
474 | static void st_do_stats(struct scsi_tape *STp, struct request *req) |
475 | { | |
476 | ktime_t now; | |
477 | ||
478 | now = ktime_get(); | |
479 | if (req->cmd[0] == WRITE_6) { | |
480 | now = ktime_sub(now, STp->stats->write_time); | |
481 | atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time); | |
482 | atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); | |
483 | atomic64_inc(&STp->stats->write_cnt); | |
484 | if (req->errors) { | |
485 | atomic64_add(atomic_read(&STp->stats->last_write_size) | |
486 | - STp->buffer->cmdstat.residual, | |
487 | &STp->stats->write_byte_cnt); | |
488 | if (STp->buffer->cmdstat.residual > 0) | |
489 | atomic64_inc(&STp->stats->resid_cnt); | |
490 | } else | |
491 | atomic64_add(atomic_read(&STp->stats->last_write_size), | |
492 | &STp->stats->write_byte_cnt); | |
493 | } else if (req->cmd[0] == READ_6) { | |
494 | now = ktime_sub(now, STp->stats->read_time); | |
495 | atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time); | |
496 | atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); | |
497 | atomic64_inc(&STp->stats->read_cnt); | |
498 | if (req->errors) { | |
499 | atomic64_add(atomic_read(&STp->stats->last_read_size) | |
500 | - STp->buffer->cmdstat.residual, | |
501 | &STp->stats->read_byte_cnt); | |
502 | if (STp->buffer->cmdstat.residual > 0) | |
503 | atomic64_inc(&STp->stats->resid_cnt); | |
504 | } else | |
505 | atomic64_add(atomic_read(&STp->stats->last_read_size), | |
506 | &STp->stats->read_byte_cnt); | |
507 | } else { | |
508 | now = ktime_sub(now, STp->stats->other_time); | |
509 | atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); | |
510 | atomic64_inc(&STp->stats->other_cnt); | |
511 | } | |
512 | atomic64_dec(&STp->stats->in_flight); | |
513 | } | |
514 | ||
13b53b44 FT |
515 | static void st_scsi_execute_end(struct request *req, int uptodate) |
516 | { | |
517 | struct st_request *SRpnt = req->end_io_data; | |
518 | struct scsi_tape *STp = SRpnt->stp; | |
c68bf8ee | 519 | struct bio *tmp; |
13b53b44 FT |
520 | |
521 | STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors; | |
c3a4d78c | 522 | STp->buffer->cmdstat.residual = req->resid_len; |
13b53b44 | 523 | |
05545c92 SS |
524 | st_do_stats(STp, req); |
525 | ||
c68bf8ee | 526 | tmp = SRpnt->bio; |
13b53b44 FT |
527 | if (SRpnt->waiting) |
528 | complete(SRpnt->waiting); | |
529 | ||
c68bf8ee | 530 | blk_rq_unmap_user(tmp); |
13b53b44 FT |
531 | __blk_put_request(req->q, req); |
532 | } | |
533 | ||
534 | static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, | |
535 | int data_direction, void *buffer, unsigned bufflen, | |
536 | int timeout, int retries) | |
537 | { | |
538 | struct request *req; | |
539 | struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data; | |
540 | int err = 0; | |
541 | int write = (data_direction == DMA_TO_DEVICE); | |
05545c92 | 542 | struct scsi_tape *STp = SRpnt->stp; |
13b53b44 FT |
543 | |
544 | req = blk_get_request(SRpnt->stp->device->request_queue, write, | |
545 | GFP_KERNEL); | |
a492f075 | 546 | if (IS_ERR(req)) |
13b53b44 FT |
547 | return DRIVER_ERROR << 24; |
548 | ||
f27b087b | 549 | blk_rq_set_block_pc(req); |
13b53b44 FT |
550 | req->cmd_flags |= REQ_QUIET; |
551 | ||
552 | mdata->null_mapped = 1; | |
553 | ||
02ae2c0e KM |
554 | if (bufflen) { |
555 | err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, | |
556 | GFP_KERNEL); | |
557 | if (err) { | |
558 | blk_put_request(req); | |
559 | return DRIVER_ERROR << 24; | |
560 | } | |
13b53b44 FT |
561 | } |
562 | ||
05545c92 SS |
563 | atomic64_inc(&STp->stats->in_flight); |
564 | if (cmd[0] == WRITE_6) { | |
565 | atomic_set(&STp->stats->last_write_size, bufflen); | |
566 | STp->stats->write_time = ktime_get(); | |
567 | } else if (cmd[0] == READ_6) { | |
568 | atomic_set(&STp->stats->last_read_size, bufflen); | |
569 | STp->stats->read_time = ktime_get(); | |
570 | } else { | |
571 | STp->stats->other_time = ktime_get(); | |
572 | } | |
573 | ||
13b53b44 FT |
574 | SRpnt->bio = req->bio; |
575 | req->cmd_len = COMMAND_SIZE(cmd[0]); | |
576 | memset(req->cmd, 0, BLK_MAX_CDB); | |
577 | memcpy(req->cmd, cmd, req->cmd_len); | |
578 | req->sense = SRpnt->sense; | |
579 | req->sense_len = 0; | |
580 | req->timeout = timeout; | |
581 | req->retries = retries; | |
582 | req->end_io_data = SRpnt; | |
583 | ||
584 | blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end); | |
585 | return 0; | |
586 | } | |
587 | ||
1da177e4 LT |
588 | /* Do the scsi command. Waits until command performed if do_wait is true. |
589 | Otherwise write_behind_check() is used to check that the command | |
590 | has finished. */ | |
8b05b773 MC |
591 | static struct st_request * |
592 | st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, | |
1da177e4 LT |
593 | int bytes, int direction, int timeout, int retries, int do_wait) |
594 | { | |
f03a5670 | 595 | struct completion *waiting; |
6d476267 FT |
596 | struct rq_map_data *mdata = &STp->buffer->map_data; |
597 | int ret; | |
1da177e4 | 598 | |
f03a5670 KM |
599 | /* if async, make sure there's no command outstanding */ |
600 | if (!do_wait && ((STp->buffer)->last_SRpnt)) { | |
b30d8bca HR |
601 | st_printk(KERN_ERR, STp, |
602 | "Async command already active.\n"); | |
f03a5670 KM |
603 | if (signal_pending(current)) |
604 | (STp->buffer)->syscall_result = (-EINTR); | |
605 | else | |
606 | (STp->buffer)->syscall_result = (-EBUSY); | |
607 | return NULL; | |
608 | } | |
609 | ||
4deba245 FT |
610 | if (!SRpnt) { |
611 | SRpnt = st_allocate_request(STp); | |
612 | if (!SRpnt) | |
1da177e4 | 613 | return NULL; |
1da177e4 LT |
614 | } |
615 | ||
f03a5670 KM |
616 | /* If async IO, set last_SRpnt. This ptr tells write_behind_check |
617 | which IO is outstanding. It's nulled out when the IO completes. */ | |
618 | if (!do_wait) | |
619 | (STp->buffer)->last_SRpnt = SRpnt; | |
620 | ||
621 | waiting = &STp->wait; | |
622 | init_completion(waiting); | |
8b05b773 | 623 | SRpnt->waiting = waiting; |
1da177e4 | 624 | |
6620742f | 625 | if (STp->buffer->do_dio) { |
c982c368 | 626 | mdata->page_order = 0; |
6620742f FT |
627 | mdata->nr_entries = STp->buffer->sg_segs; |
628 | mdata->pages = STp->buffer->mapped_pages; | |
629 | } else { | |
c982c368 | 630 | mdata->page_order = STp->buffer->reserved_page_order; |
6d476267 FT |
631 | mdata->nr_entries = |
632 | DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order); | |
c982c368 FT |
633 | mdata->pages = STp->buffer->reserved_pages; |
634 | mdata->offset = 0; | |
6d476267 FT |
635 | } |
636 | ||
8b05b773 MC |
637 | memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd)); |
638 | STp->buffer->cmdstat.have_sense = 0; | |
639 | STp->buffer->syscall_result = 0; | |
640 | ||
6620742f FT |
641 | ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout, |
642 | retries); | |
6d476267 | 643 | if (ret) { |
8b05b773 MC |
644 | /* could not allocate the buffer or request was too large */ |
645 | (STp->buffer)->syscall_result = (-EBUSY); | |
787926b1 | 646 | (STp->buffer)->last_SRpnt = NULL; |
6d476267 | 647 | } else if (do_wait) { |
f03a5670 | 648 | wait_for_completion(waiting); |
8b05b773 | 649 | SRpnt->waiting = NULL; |
1da177e4 LT |
650 | (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); |
651 | } | |
8b05b773 | 652 | |
1da177e4 LT |
653 | return SRpnt; |
654 | } | |
655 | ||
656 | ||
657 | /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if | |
658 | write has been correct but EOM early warning reached, -EIO if write ended in | |
659 | error or zero if write successful. Asynchronous writes are used only in | |
660 | variable block mode. */ | |
661 | static int write_behind_check(struct scsi_tape * STp) | |
662 | { | |
663 | int retval = 0; | |
664 | struct st_buffer *STbuffer; | |
665 | struct st_partstat *STps; | |
666 | struct st_cmdstatus *cmdstatp; | |
8b05b773 | 667 | struct st_request *SRpnt; |
1da177e4 LT |
668 | |
669 | STbuffer = STp->buffer; | |
670 | if (!STbuffer->writing) | |
671 | return 0; | |
672 | ||
b30d8bca | 673 | DEB( |
1da177e4 LT |
674 | if (STp->write_pending) |
675 | STp->nbr_waits++; | |
676 | else | |
677 | STp->nbr_finished++; | |
b30d8bca | 678 | ) /* end DEB */ |
1da177e4 LT |
679 | |
680 | wait_for_completion(&(STp->wait)); | |
f03a5670 KM |
681 | SRpnt = STbuffer->last_SRpnt; |
682 | STbuffer->last_SRpnt = NULL; | |
8b05b773 | 683 | SRpnt->waiting = NULL; |
1da177e4 | 684 | |
f03a5670 | 685 | (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); |
8b05b773 | 686 | st_release_request(SRpnt); |
1da177e4 LT |
687 | |
688 | STbuffer->buffer_bytes -= STbuffer->writing; | |
689 | STps = &(STp->ps[STp->partition]); | |
690 | if (STps->drv_block >= 0) { | |
691 | if (STp->block_size == 0) | |
692 | STps->drv_block++; | |
693 | else | |
694 | STps->drv_block += STbuffer->writing / STp->block_size; | |
695 | } | |
696 | ||
697 | cmdstatp = &STbuffer->cmdstat; | |
698 | if (STbuffer->syscall_result) { | |
699 | retval = -EIO; | |
700 | if (cmdstatp->have_sense && !cmdstatp->deferred && | |
701 | (cmdstatp->flags & SENSE_EOM) && | |
702 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
703 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) { | |
704 | /* EOM at write-behind, has all data been written? */ | |
705 | if (!cmdstatp->remainder_valid || | |
706 | cmdstatp->uremainder64 == 0) | |
707 | retval = -ENOSPC; | |
708 | } | |
709 | if (retval == -EIO) | |
710 | STps->drv_block = -1; | |
711 | } | |
712 | STbuffer->writing = 0; | |
713 | ||
714 | DEB(if (debugging && retval) | |
b30d8bca HR |
715 | st_printk(ST_DEB_MSG, STp, |
716 | "Async write error %x, return value %d.\n", | |
717 | STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */ | |
1da177e4 LT |
718 | |
719 | return retval; | |
720 | } | |
721 | ||
722 | ||
723 | /* Step over EOF if it has been inadvertently crossed (ioctl not used because | |
724 | it messes up the block number). */ | |
725 | static int cross_eof(struct scsi_tape * STp, int forward) | |
726 | { | |
8b05b773 | 727 | struct st_request *SRpnt; |
1da177e4 LT |
728 | unsigned char cmd[MAX_COMMAND_SIZE]; |
729 | ||
730 | cmd[0] = SPACE; | |
731 | cmd[1] = 0x01; /* Space FileMarks */ | |
732 | if (forward) { | |
733 | cmd[2] = cmd[3] = 0; | |
734 | cmd[4] = 1; | |
735 | } else | |
736 | cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ | |
737 | cmd[5] = 0; | |
738 | ||
b30d8bca HR |
739 | DEBC_printk(STp, "Stepping over filemark %s.\n", |
740 | forward ? "forward" : "backward"); | |
1da177e4 | 741 | |
02ae2c0e KM |
742 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
743 | STp->device->request_queue->rq_timeout, | |
744 | MAX_RETRIES, 1); | |
1da177e4 | 745 | if (!SRpnt) |
02ae2c0e | 746 | return (STp->buffer)->syscall_result; |
39ade4b1 | 747 | |
02ae2c0e KM |
748 | st_release_request(SRpnt); |
749 | SRpnt = NULL; | |
1da177e4 LT |
750 | |
751 | if ((STp->buffer)->cmdstat.midlevel_result != 0) | |
b30d8bca HR |
752 | st_printk(KERN_ERR, STp, |
753 | "Stepping over filemark %s failed.\n", | |
754 | forward ? "forward" : "backward"); | |
1da177e4 | 755 | |
02ae2c0e | 756 | return (STp->buffer)->syscall_result; |
1da177e4 LT |
757 | } |
758 | ||
759 | ||
760 | /* Flush the write buffer (never need to write if variable blocksize). */ | |
8ef8d594 | 761 | static int st_flush_write_buffer(struct scsi_tape * STp) |
1da177e4 | 762 | { |
786231af | 763 | int transfer, blks; |
1da177e4 LT |
764 | int result; |
765 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 766 | struct st_request *SRpnt; |
1da177e4 LT |
767 | struct st_partstat *STps; |
768 | ||
769 | result = write_behind_check(STp); | |
770 | if (result) | |
771 | return result; | |
772 | ||
773 | result = 0; | |
774 | if (STp->dirty == 1) { | |
775 | ||
786231af | 776 | transfer = STp->buffer->buffer_bytes; |
b30d8bca | 777 | DEBC_printk(STp, "Flushing %d bytes.\n", transfer); |
1da177e4 | 778 | |
1da177e4 LT |
779 | memset(cmd, 0, MAX_COMMAND_SIZE); |
780 | cmd[0] = WRITE_6; | |
781 | cmd[1] = 1; | |
782 | blks = transfer / STp->block_size; | |
783 | cmd[2] = blks >> 16; | |
784 | cmd[3] = blks >> 8; | |
785 | cmd[4] = blks; | |
786 | ||
787 | SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE, | |
a02488ed JB |
788 | STp->device->request_queue->rq_timeout, |
789 | MAX_WRITE_RETRIES, 1); | |
1da177e4 LT |
790 | if (!SRpnt) |
791 | return (STp->buffer)->syscall_result; | |
792 | ||
793 | STps = &(STp->ps[STp->partition]); | |
794 | if ((STp->buffer)->syscall_result != 0) { | |
795 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
796 | ||
797 | if (cmdstatp->have_sense && !cmdstatp->deferred && | |
798 | (cmdstatp->flags & SENSE_EOM) && | |
799 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
800 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && | |
801 | (!cmdstatp->remainder_valid || | |
802 | cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */ | |
803 | STp->dirty = 0; | |
804 | (STp->buffer)->buffer_bytes = 0; | |
805 | if (STps->drv_block >= 0) | |
806 | STps->drv_block += blks; | |
807 | result = (-ENOSPC); | |
808 | } else { | |
b30d8bca | 809 | st_printk(KERN_ERR, STp, "Error on flush.\n"); |
1da177e4 LT |
810 | STps->drv_block = (-1); |
811 | result = (-EIO); | |
812 | } | |
813 | } else { | |
814 | if (STps->drv_block >= 0) | |
815 | STps->drv_block += blks; | |
816 | STp->dirty = 0; | |
817 | (STp->buffer)->buffer_bytes = 0; | |
818 | } | |
8b05b773 | 819 | st_release_request(SRpnt); |
1da177e4 LT |
820 | SRpnt = NULL; |
821 | } | |
822 | return result; | |
823 | } | |
824 | ||
825 | ||
826 | /* Flush the tape buffer. The tape will be positioned correctly unless | |
827 | seek_next is true. */ | |
828 | static int flush_buffer(struct scsi_tape *STp, int seek_next) | |
829 | { | |
830 | int backspace, result; | |
831 | struct st_buffer *STbuffer; | |
832 | struct st_partstat *STps; | |
833 | ||
834 | STbuffer = STp->buffer; | |
835 | ||
836 | /* | |
837 | * If there was a bus reset, block further access | |
838 | * to this device. | |
839 | */ | |
840 | if (STp->pos_unknown) | |
841 | return (-EIO); | |
842 | ||
843 | if (STp->ready != ST_READY) | |
844 | return 0; | |
845 | STps = &(STp->ps[STp->partition]); | |
846 | if (STps->rw == ST_WRITING) /* Writing */ | |
8ef8d594 | 847 | return st_flush_write_buffer(STp); |
1da177e4 LT |
848 | |
849 | if (STp->block_size == 0) | |
850 | return 0; | |
851 | ||
852 | backspace = ((STp->buffer)->buffer_bytes + | |
853 | (STp->buffer)->read_pointer) / STp->block_size - | |
854 | ((STp->buffer)->read_pointer + STp->block_size - 1) / | |
855 | STp->block_size; | |
856 | (STp->buffer)->buffer_bytes = 0; | |
857 | (STp->buffer)->read_pointer = 0; | |
858 | result = 0; | |
859 | if (!seek_next) { | |
860 | if (STps->eof == ST_FM_HIT) { | |
861 | result = cross_eof(STp, 0); /* Back over the EOF hit */ | |
862 | if (!result) | |
863 | STps->eof = ST_NOEOF; | |
864 | else { | |
865 | if (STps->drv_file >= 0) | |
866 | STps->drv_file++; | |
867 | STps->drv_block = 0; | |
868 | } | |
869 | } | |
870 | if (!result && backspace > 0) | |
871 | result = st_int_ioctl(STp, MTBSR, backspace); | |
872 | } else if (STps->eof == ST_FM_HIT) { | |
873 | if (STps->drv_file >= 0) | |
874 | STps->drv_file++; | |
875 | STps->drv_block = 0; | |
876 | STps->eof = ST_NOEOF; | |
877 | } | |
878 | return result; | |
879 | ||
880 | } | |
881 | \f | |
882 | /* Set the mode parameters */ | |
883 | static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm) | |
884 | { | |
885 | int set_it = 0; | |
886 | unsigned long arg; | |
1da177e4 LT |
887 | |
888 | if (!STp->density_changed && | |
889 | STm->default_density >= 0 && | |
890 | STm->default_density != STp->density) { | |
891 | arg = STm->default_density; | |
892 | set_it = 1; | |
893 | } else | |
894 | arg = STp->density; | |
895 | arg <<= MT_ST_DENSITY_SHIFT; | |
896 | if (!STp->blksize_changed && | |
897 | STm->default_blksize >= 0 && | |
898 | STm->default_blksize != STp->block_size) { | |
899 | arg |= STm->default_blksize; | |
900 | set_it = 1; | |
901 | } else | |
902 | arg |= STp->block_size; | |
903 | if (set_it && | |
904 | st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) { | |
b30d8bca HR |
905 | st_printk(KERN_WARNING, STp, |
906 | "Can't set default block size to %d bytes " | |
907 | "and density %x.\n", | |
908 | STm->default_blksize, STm->default_density); | |
1da177e4 LT |
909 | if (modes_defined) |
910 | return (-EINVAL); | |
911 | } | |
912 | return 0; | |
913 | } | |
914 | ||
915 | ||
8b05b773 | 916 | /* Lock or unlock the drive door. Don't use when st_request allocated. */ |
1da177e4 LT |
917 | static int do_door_lock(struct scsi_tape * STp, int do_lock) |
918 | { | |
dccfa688 | 919 | int retval; |
1da177e4 | 920 | |
b30d8bca | 921 | DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl"); |
dccfa688 CH |
922 | |
923 | retval = scsi_set_medium_removal(STp->device, | |
924 | do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW); | |
925 | if (!retval) | |
1da177e4 | 926 | STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; |
dccfa688 | 927 | else |
1da177e4 | 928 | STp->door_locked = ST_LOCK_FAILS; |
1da177e4 LT |
929 | return retval; |
930 | } | |
931 | ||
932 | ||
933 | /* Set the internal state after reset */ | |
934 | static void reset_state(struct scsi_tape *STp) | |
935 | { | |
936 | int i; | |
937 | struct st_partstat *STps; | |
938 | ||
939 | STp->pos_unknown = 0; | |
940 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
941 | STps = &(STp->ps[i]); | |
942 | STps->rw = ST_IDLE; | |
943 | STps->eof = ST_NOEOF; | |
944 | STps->at_sm = 0; | |
945 | STps->last_block_valid = 0; | |
946 | STps->drv_block = -1; | |
947 | STps->drv_file = -1; | |
948 | } | |
949 | if (STp->can_partitions) { | |
950 | STp->partition = find_partition(STp); | |
951 | if (STp->partition < 0) | |
952 | STp->partition = 0; | |
953 | STp->new_partition = STp->partition; | |
954 | } | |
955 | } | |
956 | \f | |
957 | /* Test if the drive is ready. Returns either one of the codes below or a negative system | |
958 | error code. */ | |
959 | #define CHKRES_READY 0 | |
960 | #define CHKRES_NEW_SESSION 1 | |
961 | #define CHKRES_NOT_READY 2 | |
962 | #define CHKRES_NO_TAPE 3 | |
963 | ||
964 | #define MAX_ATTENTIONS 10 | |
965 | ||
966 | static int test_ready(struct scsi_tape *STp, int do_wait) | |
967 | { | |
968 | int attentions, waits, max_wait, scode; | |
969 | int retval = CHKRES_READY, new_session = 0; | |
970 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
02ae2c0e | 971 | struct st_request *SRpnt = NULL; |
1da177e4 LT |
972 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; |
973 | ||
974 | max_wait = do_wait ? ST_BLOCK_SECONDS : 0; | |
975 | ||
976 | for (attentions=waits=0; ; ) { | |
977 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
978 | cmd[0] = TEST_UNIT_READY; | |
02ae2c0e KM |
979 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, |
980 | STp->long_timeout, MAX_READY_RETRIES, 1); | |
1da177e4 | 981 | |
02ae2c0e KM |
982 | if (!SRpnt) { |
983 | retval = (STp->buffer)->syscall_result; | |
1da177e4 | 984 | break; |
02ae2c0e | 985 | } |
1da177e4 LT |
986 | |
987 | if (cmdstatp->have_sense) { | |
988 | ||
989 | scode = cmdstatp->sense_hdr.sense_key; | |
990 | ||
991 | if (scode == UNIT_ATTENTION) { /* New media? */ | |
992 | new_session = 1; | |
993 | if (attentions < MAX_ATTENTIONS) { | |
994 | attentions++; | |
995 | continue; | |
996 | } | |
997 | else { | |
998 | retval = (-EIO); | |
999 | break; | |
1000 | } | |
1001 | } | |
1002 | ||
1003 | if (scode == NOT_READY) { | |
1004 | if (waits < max_wait) { | |
1005 | if (msleep_interruptible(1000)) { | |
1006 | retval = (-EINTR); | |
1007 | break; | |
1008 | } | |
1009 | waits++; | |
1010 | continue; | |
1011 | } | |
1012 | else { | |
1013 | if ((STp->device)->scsi_level >= SCSI_2 && | |
1014 | cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */ | |
1015 | retval = CHKRES_NO_TAPE; | |
1016 | else | |
1017 | retval = CHKRES_NOT_READY; | |
1018 | break; | |
1019 | } | |
1020 | } | |
1021 | } | |
1022 | ||
1023 | retval = (STp->buffer)->syscall_result; | |
1024 | if (!retval) | |
1025 | retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY; | |
1026 | break; | |
1027 | } | |
1028 | ||
02ae2c0e KM |
1029 | if (SRpnt != NULL) |
1030 | st_release_request(SRpnt); | |
1da177e4 LT |
1031 | return retval; |
1032 | } | |
1033 | ||
1034 | ||
1035 | /* See if the drive is ready and gather information about the tape. Return values: | |
1036 | < 0 negative error code from errno.h | |
1037 | 0 drive ready | |
1038 | 1 drive not ready (possibly no tape) | |
1039 | */ | |
1040 | static int check_tape(struct scsi_tape *STp, struct file *filp) | |
1041 | { | |
1042 | int i, retval, new_session = 0, do_wait; | |
1043 | unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning; | |
1044 | unsigned short st_flags = filp->f_flags; | |
8b05b773 | 1045 | struct st_request *SRpnt = NULL; |
1da177e4 LT |
1046 | struct st_modedef *STm; |
1047 | struct st_partstat *STps; | |
496ad9aa | 1048 | struct inode *inode = file_inode(filp); |
1da177e4 LT |
1049 | int mode = TAPE_MODE(inode); |
1050 | ||
1051 | STp->ready = ST_READY; | |
1052 | ||
1053 | if (mode != STp->current_mode) { | |
b30d8bca HR |
1054 | DEBC_printk(STp, "Mode change from %d to %d.\n", |
1055 | STp->current_mode, mode); | |
1da177e4 LT |
1056 | new_session = 1; |
1057 | STp->current_mode = mode; | |
1058 | } | |
1059 | STm = &(STp->modes[STp->current_mode]); | |
1060 | ||
1061 | saved_cleaning = STp->cleaning_req; | |
1062 | STp->cleaning_req = 0; | |
1063 | ||
1064 | do_wait = ((filp->f_flags & O_NONBLOCK) == 0); | |
1065 | retval = test_ready(STp, do_wait); | |
1066 | ||
1067 | if (retval < 0) | |
1068 | goto err_out; | |
1069 | ||
1070 | if (retval == CHKRES_NEW_SESSION) { | |
1071 | STp->pos_unknown = 0; | |
1072 | STp->partition = STp->new_partition = 0; | |
1073 | if (STp->can_partitions) | |
1074 | STp->nbr_partitions = 1; /* This guess will be updated later | |
1075 | if necessary */ | |
1076 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
1077 | STps = &(STp->ps[i]); | |
1078 | STps->rw = ST_IDLE; | |
1079 | STps->eof = ST_NOEOF; | |
1080 | STps->at_sm = 0; | |
1081 | STps->last_block_valid = 0; | |
1082 | STps->drv_block = 0; | |
1083 | STps->drv_file = 0; | |
1084 | } | |
1085 | new_session = 1; | |
1086 | } | |
1087 | else { | |
1088 | STp->cleaning_req |= saved_cleaning; | |
1089 | ||
1090 | if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) { | |
1091 | if (retval == CHKRES_NO_TAPE) | |
1092 | STp->ready = ST_NO_TAPE; | |
1093 | else | |
1094 | STp->ready = ST_NOT_READY; | |
1095 | ||
1096 | STp->density = 0; /* Clear the erroneous "residue" */ | |
1097 | STp->write_prot = 0; | |
1098 | STp->block_size = 0; | |
1099 | STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); | |
1100 | STp->partition = STp->new_partition = 0; | |
1101 | STp->door_locked = ST_UNLOCKED; | |
1102 | return CHKRES_NOT_READY; | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | if (STp->omit_blklims) | |
1107 | STp->min_block = STp->max_block = (-1); | |
1108 | else { | |
1109 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
1110 | cmd[0] = READ_BLOCK_LIMITS; | |
1111 | ||
02ae2c0e KM |
1112 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, |
1113 | STp->device->request_queue->rq_timeout, | |
1114 | MAX_READY_RETRIES, 1); | |
1115 | if (!SRpnt) { | |
1116 | retval = (STp->buffer)->syscall_result; | |
1da177e4 LT |
1117 | goto err_out; |
1118 | } | |
1119 | ||
8b05b773 | 1120 | if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) { |
1da177e4 LT |
1121 | STp->max_block = ((STp->buffer)->b_data[1] << 16) | |
1122 | ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; | |
1123 | STp->min_block = ((STp->buffer)->b_data[4] << 8) | | |
1124 | (STp->buffer)->b_data[5]; | |
1125 | if ( DEB( debugging || ) !STp->inited) | |
b30d8bca HR |
1126 | st_printk(KERN_INFO, STp, |
1127 | "Block limits %d - %d bytes.\n", | |
1128 | STp->min_block, STp->max_block); | |
1da177e4 LT |
1129 | } else { |
1130 | STp->min_block = STp->max_block = (-1); | |
b30d8bca | 1131 | DEBC_printk(STp, "Can't read block limits.\n"); |
1da177e4 LT |
1132 | } |
1133 | } | |
1134 | ||
1135 | memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); | |
1136 | cmd[0] = MODE_SENSE; | |
1137 | cmd[4] = 12; | |
1138 | ||
02ae2c0e KM |
1139 | SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, |
1140 | STp->device->request_queue->rq_timeout, | |
1141 | MAX_READY_RETRIES, 1); | |
1142 | if (!SRpnt) { | |
1143 | retval = (STp->buffer)->syscall_result; | |
1da177e4 LT |
1144 | goto err_out; |
1145 | } | |
1146 | ||
1147 | if ((STp->buffer)->syscall_result != 0) { | |
b30d8bca | 1148 | DEBC_printk(STp, "No Mode Sense.\n"); |
1da177e4 LT |
1149 | STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ |
1150 | (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ | |
1151 | STp->drv_write_prot = 0; | |
1152 | } else { | |
b30d8bca HR |
1153 | DEBC_printk(STp,"Mode sense. Length %d, " |
1154 | "medium %x, WBS %x, BLL %d\n", | |
1155 | (STp->buffer)->b_data[0], | |
1156 | (STp->buffer)->b_data[1], | |
1157 | (STp->buffer)->b_data[2], | |
1158 | (STp->buffer)->b_data[3]); | |
1da177e4 LT |
1159 | |
1160 | if ((STp->buffer)->b_data[3] >= 8) { | |
1161 | STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; | |
1162 | STp->density = (STp->buffer)->b_data[4]; | |
1163 | STp->block_size = (STp->buffer)->b_data[9] * 65536 + | |
1164 | (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; | |
b30d8bca HR |
1165 | DEBC_printk(STp, "Density %x, tape length: %x, " |
1166 | "drv buffer: %d\n", | |
1167 | STp->density, | |
1168 | (STp->buffer)->b_data[5] * 65536 + | |
1169 | (STp->buffer)->b_data[6] * 256 + | |
1170 | (STp->buffer)->b_data[7], | |
1171 | STp->drv_buffer); | |
1da177e4 LT |
1172 | } |
1173 | STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; | |
c743e44f | 1174 | if (!STp->drv_buffer && STp->immediate_filemark) { |
b30d8bca HR |
1175 | st_printk(KERN_WARNING, STp, |
1176 | "non-buffered tape: disabling " | |
1177 | "writing immediate filemarks\n"); | |
c743e44f LD |
1178 | STp->immediate_filemark = 0; |
1179 | } | |
1da177e4 | 1180 | } |
8b05b773 | 1181 | st_release_request(SRpnt); |
1da177e4 | 1182 | SRpnt = NULL; |
b30d8bca | 1183 | STp->inited = 1; |
1da177e4 LT |
1184 | |
1185 | if (STp->block_size > 0) | |
1186 | (STp->buffer)->buffer_blocks = | |
b30d8bca | 1187 | (STp->buffer)->buffer_size / STp->block_size; |
1da177e4 LT |
1188 | else |
1189 | (STp->buffer)->buffer_blocks = 1; | |
1190 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; | |
1191 | ||
b30d8bca HR |
1192 | DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n", |
1193 | STp->block_size, (STp->buffer)->buffer_size, | |
1194 | (STp->buffer)->buffer_blocks); | |
1da177e4 LT |
1195 | |
1196 | if (STp->drv_write_prot) { | |
1197 | STp->write_prot = 1; | |
1198 | ||
b30d8bca | 1199 | DEBC_printk(STp, "Write protected\n"); |
1da177e4 LT |
1200 | |
1201 | if (do_wait && | |
1202 | ((st_flags & O_ACCMODE) == O_WRONLY || | |
1203 | (st_flags & O_ACCMODE) == O_RDWR)) { | |
1204 | retval = (-EROFS); | |
1205 | goto err_out; | |
1206 | } | |
1207 | } | |
1208 | ||
1209 | if (STp->can_partitions && STp->nbr_partitions < 1) { | |
1210 | /* This code is reached when the device is opened for the first time | |
1211 | after the driver has been initialized with tape in the drive and the | |
1212 | partition support has been enabled. */ | |
b30d8bca | 1213 | DEBC_printk(STp, "Updating partition number in status.\n"); |
1da177e4 LT |
1214 | if ((STp->partition = find_partition(STp)) < 0) { |
1215 | retval = STp->partition; | |
1216 | goto err_out; | |
1217 | } | |
1218 | STp->new_partition = STp->partition; | |
1219 | STp->nbr_partitions = 1; /* This guess will be updated when necessary */ | |
1220 | } | |
1221 | ||
1222 | if (new_session) { /* Change the drive parameters for the new mode */ | |
1223 | STp->density_changed = STp->blksize_changed = 0; | |
1224 | STp->compression_changed = 0; | |
1225 | if (!(STm->defaults_for_writes) && | |
1226 | (retval = set_mode_densblk(STp, STm)) < 0) | |
1227 | goto err_out; | |
1228 | ||
1229 | if (STp->default_drvbuffer != 0xff) { | |
1230 | if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer)) | |
b30d8bca HR |
1231 | st_printk(KERN_WARNING, STp, |
1232 | "Can't set default drive " | |
1233 | "buffering to %d.\n", | |
1234 | STp->default_drvbuffer); | |
1da177e4 LT |
1235 | } |
1236 | } | |
1237 | ||
1238 | return CHKRES_READY; | |
1239 | ||
1240 | err_out: | |
1241 | return retval; | |
1242 | } | |
1243 | ||
1244 | ||
b3369c68 | 1245 | \f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host |
1da177e4 LT |
1246 | module count. */ |
1247 | static int st_open(struct inode *inode, struct file *filp) | |
1248 | { | |
1249 | int i, retval = (-EIO); | |
46a243f7 | 1250 | int resumed = 0; |
1da177e4 LT |
1251 | struct scsi_tape *STp; |
1252 | struct st_partstat *STps; | |
1253 | int dev = TAPE_NR(inode); | |
1da177e4 LT |
1254 | |
1255 | /* | |
1256 | * We really want to do nonseekable_open(inode, filp); here, but some | |
1257 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
1258 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
1259 | */ | |
1260 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
1261 | ||
b3369c68 | 1262 | if (!(STp = scsi_tape_get(dev))) { |
f03a5670 | 1263 | return -ENXIO; |
b3369c68 | 1264 | } |
f03a5670 | 1265 | |
1da177e4 | 1266 | filp->private_data = STp; |
1da177e4 | 1267 | |
6c648d95 | 1268 | spin_lock(&st_use_lock); |
1da177e4 | 1269 | if (STp->in_use) { |
6c648d95 | 1270 | spin_unlock(&st_use_lock); |
f03a5670 | 1271 | scsi_tape_put(STp); |
b30d8bca | 1272 | DEBC_printk(STp, "Device already in use.\n"); |
1da177e4 LT |
1273 | return (-EBUSY); |
1274 | } | |
1275 | ||
1da177e4 | 1276 | STp->in_use = 1; |
6c648d95 | 1277 | spin_unlock(&st_use_lock); |
1da177e4 LT |
1278 | STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; |
1279 | ||
46a243f7 ON |
1280 | if (scsi_autopm_get_device(STp->device) < 0) { |
1281 | retval = -EIO; | |
1282 | goto err_out; | |
1283 | } | |
1284 | resumed = 1; | |
1da177e4 LT |
1285 | if (!scsi_block_when_processing_errors(STp->device)) { |
1286 | retval = (-ENXIO); | |
1287 | goto err_out; | |
1288 | } | |
1289 | ||
1290 | /* See that we have at least a one page buffer available */ | |
1291 | if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) { | |
b30d8bca HR |
1292 | st_printk(KERN_WARNING, STp, |
1293 | "Can't allocate one page tape buffer.\n"); | |
1da177e4 LT |
1294 | retval = (-EOVERFLOW); |
1295 | goto err_out; | |
1296 | } | |
1297 | ||
40f6b36c | 1298 | (STp->buffer)->cleared = 0; |
1da177e4 LT |
1299 | (STp->buffer)->writing = 0; |
1300 | (STp->buffer)->syscall_result = 0; | |
1301 | ||
1302 | STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY); | |
1303 | ||
1304 | STp->dirty = 0; | |
1305 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
1306 | STps = &(STp->ps[i]); | |
1307 | STps->rw = ST_IDLE; | |
1308 | } | |
9abe16c6 | 1309 | STp->try_dio_now = STp->try_dio; |
1da177e4 LT |
1310 | STp->recover_count = 0; |
1311 | DEB( STp->nbr_waits = STp->nbr_finished = 0; | |
deee13df | 1312 | STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; ) |
1da177e4 LT |
1313 | |
1314 | retval = check_tape(STp, filp); | |
1315 | if (retval < 0) | |
1316 | goto err_out; | |
1317 | if ((filp->f_flags & O_NONBLOCK) == 0 && | |
1318 | retval != CHKRES_READY) { | |
413f7327 KM |
1319 | if (STp->ready == NO_TAPE) |
1320 | retval = (-ENOMEDIUM); | |
1321 | else | |
1322 | retval = (-EIO); | |
1da177e4 LT |
1323 | goto err_out; |
1324 | } | |
1325 | return 0; | |
1326 | ||
1327 | err_out: | |
1328 | normalize_buffer(STp->buffer); | |
0644f539 | 1329 | spin_lock(&st_use_lock); |
1da177e4 | 1330 | STp->in_use = 0; |
0644f539 | 1331 | spin_unlock(&st_use_lock); |
46a243f7 ON |
1332 | if (resumed) |
1333 | scsi_autopm_put_device(STp->device); | |
e7ac6c66 | 1334 | scsi_tape_put(STp); |
1da177e4 LT |
1335 | return retval; |
1336 | ||
1337 | } | |
1338 | \f | |
1339 | ||
1340 | /* Flush the tape buffer before close */ | |
75e1fcc0 | 1341 | static int st_flush(struct file *filp, fl_owner_t id) |
1da177e4 LT |
1342 | { |
1343 | int result = 0, result2; | |
1344 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 1345 | struct st_request *SRpnt; |
1da177e4 LT |
1346 | struct scsi_tape *STp = filp->private_data; |
1347 | struct st_modedef *STm = &(STp->modes[STp->current_mode]); | |
1348 | struct st_partstat *STps = &(STp->ps[STp->partition]); | |
1da177e4 LT |
1349 | |
1350 | if (file_count(filp) > 1) | |
1351 | return 0; | |
1352 | ||
1353 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { | |
8ef8d594 | 1354 | result = st_flush_write_buffer(STp); |
1da177e4 LT |
1355 | if (result != 0 && result != (-ENOSPC)) |
1356 | goto out; | |
1357 | } | |
1358 | ||
1359 | if (STp->can_partitions && | |
1360 | (result2 = switch_partition(STp)) < 0) { | |
b30d8bca | 1361 | DEBC_printk(STp, "switch_partition at close failed.\n"); |
1da177e4 LT |
1362 | if (result == 0) |
1363 | result = result2; | |
1364 | goto out; | |
1365 | } | |
1366 | ||
1367 | DEBC( if (STp->nbr_requests) | |
b30d8bca HR |
1368 | st_printk(KERN_DEBUG, STp, |
1369 | "Number of r/w requests %d, dio used in %d, " | |
1370 | "pages %d.\n", STp->nbr_requests, STp->nbr_dio, | |
1371 | STp->nbr_pages)); | |
1da177e4 LT |
1372 | |
1373 | if (STps->rw == ST_WRITING && !STp->pos_unknown) { | |
1374 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1375 | ||
b30d8bca HR |
1376 | #if DEBUG |
1377 | DEBC_printk(STp, "Async write waits %d, finished %d.\n", | |
1378 | STp->nbr_waits, STp->nbr_finished); | |
1379 | #endif | |
1da177e4 LT |
1380 | memset(cmd, 0, MAX_COMMAND_SIZE); |
1381 | cmd[0] = WRITE_FILEMARKS; | |
c743e44f LD |
1382 | if (STp->immediate_filemark) |
1383 | cmd[1] = 1; | |
1da177e4 LT |
1384 | cmd[4] = 1 + STp->two_fm; |
1385 | ||
02ae2c0e KM |
1386 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
1387 | STp->device->request_queue->rq_timeout, | |
1388 | MAX_WRITE_RETRIES, 1); | |
1da177e4 | 1389 | if (!SRpnt) { |
02ae2c0e | 1390 | result = (STp->buffer)->syscall_result; |
1da177e4 LT |
1391 | goto out; |
1392 | } | |
1393 | ||
1394 | if (STp->buffer->syscall_result == 0 || | |
1395 | (cmdstatp->have_sense && !cmdstatp->deferred && | |
1396 | (cmdstatp->flags & SENSE_EOM) && | |
1397 | (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
1398 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && | |
1399 | (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) { | |
1400 | /* Write successful at EOM */ | |
8b05b773 | 1401 | st_release_request(SRpnt); |
1da177e4 LT |
1402 | SRpnt = NULL; |
1403 | if (STps->drv_file >= 0) | |
1404 | STps->drv_file++; | |
1405 | STps->drv_block = 0; | |
1406 | if (STp->two_fm) | |
1407 | cross_eof(STp, 0); | |
1408 | STps->eof = ST_FM; | |
1409 | } | |
1410 | else { /* Write error */ | |
8b05b773 | 1411 | st_release_request(SRpnt); |
1da177e4 | 1412 | SRpnt = NULL; |
b30d8bca HR |
1413 | st_printk(KERN_ERR, STp, |
1414 | "Error on write filemark.\n"); | |
1da177e4 LT |
1415 | if (result == 0) |
1416 | result = (-EIO); | |
1417 | } | |
1418 | ||
b30d8bca | 1419 | DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]); |
1da177e4 LT |
1420 | } else if (!STp->rew_at_close) { |
1421 | STps = &(STp->ps[STp->partition]); | |
1422 | if (!STm->sysv || STps->rw != ST_READING) { | |
1423 | if (STp->can_bsr) | |
1424 | result = flush_buffer(STp, 0); | |
1425 | else if (STps->eof == ST_FM_HIT) { | |
1426 | result = cross_eof(STp, 0); | |
1427 | if (result) { | |
1428 | if (STps->drv_file >= 0) | |
1429 | STps->drv_file++; | |
1430 | STps->drv_block = 0; | |
1431 | STps->eof = ST_FM; | |
1432 | } else | |
1433 | STps->eof = ST_NOEOF; | |
1434 | } | |
1435 | } else if ((STps->eof == ST_NOEOF && | |
1436 | !(result = cross_eof(STp, 1))) || | |
1437 | STps->eof == ST_FM_HIT) { | |
1438 | if (STps->drv_file >= 0) | |
1439 | STps->drv_file++; | |
1440 | STps->drv_block = 0; | |
1441 | STps->eof = ST_FM; | |
1442 | } | |
1443 | } | |
1444 | ||
1445 | out: | |
1446 | if (STp->rew_at_close) { | |
1447 | result2 = st_int_ioctl(STp, MTREW, 1); | |
1448 | if (result == 0) | |
1449 | result = result2; | |
1450 | } | |
1451 | return result; | |
1452 | } | |
1453 | ||
1454 | ||
1455 | /* Close the device and release it. BKL is not needed: this is the only thread | |
1456 | accessing this tape. */ | |
1457 | static int st_release(struct inode *inode, struct file *filp) | |
1458 | { | |
1459 | int result = 0; | |
1460 | struct scsi_tape *STp = filp->private_data; | |
1461 | ||
1462 | if (STp->door_locked == ST_LOCKED_AUTO) | |
1463 | do_door_lock(STp, 0); | |
1464 | ||
1465 | normalize_buffer(STp->buffer); | |
6c648d95 | 1466 | spin_lock(&st_use_lock); |
1da177e4 | 1467 | STp->in_use = 0; |
6c648d95 | 1468 | spin_unlock(&st_use_lock); |
46a243f7 | 1469 | scsi_autopm_put_device(STp->device); |
f03a5670 | 1470 | scsi_tape_put(STp); |
1da177e4 LT |
1471 | |
1472 | return result; | |
1473 | } | |
1474 | \f | |
1475 | /* The checks common to both reading and writing */ | |
1476 | static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count) | |
1477 | { | |
1478 | ssize_t retval = 0; | |
1479 | ||
1480 | /* | |
1481 | * If we are in the middle of error recovery, don't let anyone | |
1482 | * else try and use this device. Also, if error recovery fails, it | |
1483 | * may try and take the device offline, in which case all further | |
1484 | * access to the device is prohibited. | |
1485 | */ | |
1486 | if (!scsi_block_when_processing_errors(STp->device)) { | |
1487 | retval = (-ENXIO); | |
1488 | goto out; | |
1489 | } | |
1490 | ||
1491 | if (STp->ready != ST_READY) { | |
1492 | if (STp->ready == ST_NO_TAPE) | |
1493 | retval = (-ENOMEDIUM); | |
1494 | else | |
1495 | retval = (-EIO); | |
1496 | goto out; | |
1497 | } | |
1498 | ||
1499 | if (! STp->modes[STp->current_mode].defined) { | |
1500 | retval = (-ENXIO); | |
1501 | goto out; | |
1502 | } | |
1503 | ||
1504 | ||
1505 | /* | |
1506 | * If there was a bus reset, block further access | |
1507 | * to this device. | |
1508 | */ | |
1509 | if (STp->pos_unknown) { | |
1510 | retval = (-EIO); | |
1511 | goto out; | |
1512 | } | |
1513 | ||
1514 | if (count == 0) | |
1515 | goto out; | |
1516 | ||
b30d8bca | 1517 | DEB( |
1da177e4 | 1518 | if (!STp->in_use) { |
b30d8bca HR |
1519 | st_printk(ST_DEB_MSG, STp, |
1520 | "Incorrect device.\n"); | |
1da177e4 LT |
1521 | retval = (-EIO); |
1522 | goto out; | |
1523 | } ) /* end DEB */ | |
1524 | ||
1525 | if (STp->can_partitions && | |
1526 | (retval = switch_partition(STp)) < 0) | |
1527 | goto out; | |
1528 | ||
1529 | if (STp->block_size == 0 && STp->max_block > 0 && | |
1530 | (count < STp->min_block || count > STp->max_block)) { | |
1531 | retval = (-EINVAL); | |
1532 | goto out; | |
1533 | } | |
1534 | ||
1535 | if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && | |
1536 | !do_door_lock(STp, 1)) | |
1537 | STp->door_locked = ST_LOCKED_AUTO; | |
1538 | ||
1539 | out: | |
1540 | return retval; | |
1541 | } | |
1542 | ||
1543 | ||
1544 | static int setup_buffering(struct scsi_tape *STp, const char __user *buf, | |
1545 | size_t count, int is_read) | |
1546 | { | |
1547 | int i, bufsize, retval = 0; | |
1548 | struct st_buffer *STbp = STp->buffer; | |
1549 | ||
1550 | if (is_read) | |
9abe16c6 | 1551 | i = STp->try_dio_now && try_rdio; |
1da177e4 | 1552 | else |
9abe16c6 | 1553 | i = STp->try_dio_now && try_wdio; |
8b05b773 | 1554 | |
1da177e4 LT |
1555 | if (i && ((unsigned long)buf & queue_dma_alignment( |
1556 | STp->device->request_queue)) == 0) { | |
6620742f FT |
1557 | i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf, |
1558 | count, (is_read ? READ : WRITE)); | |
1da177e4 LT |
1559 | if (i > 0) { |
1560 | STbp->do_dio = i; | |
1561 | STbp->buffer_bytes = 0; /* can be used as transfer counter */ | |
1562 | } | |
1563 | else | |
1564 | STbp->do_dio = 0; /* fall back to buffering with any error */ | |
1565 | STbp->sg_segs = STbp->do_dio; | |
1da177e4 LT |
1566 | DEB( |
1567 | if (STbp->do_dio) { | |
1568 | STp->nbr_dio++; | |
1569 | STp->nbr_pages += STbp->do_dio; | |
1da177e4 LT |
1570 | } |
1571 | ) | |
1572 | } else | |
1573 | STbp->do_dio = 0; | |
1574 | DEB( STp->nbr_requests++; ) | |
1575 | ||
1576 | if (!STbp->do_dio) { | |
1577 | if (STp->block_size) | |
1578 | bufsize = STp->block_size > st_fixed_buffer_size ? | |
1579 | STp->block_size : st_fixed_buffer_size; | |
40f6b36c | 1580 | else { |
1da177e4 | 1581 | bufsize = count; |
40f6b36c KM |
1582 | /* Make sure that data from previous user is not leaked even if |
1583 | HBA does not return correct residual */ | |
1584 | if (is_read && STp->sili && !STbp->cleared) | |
1585 | clear_buffer(STbp); | |
1586 | } | |
1587 | ||
1da177e4 LT |
1588 | if (bufsize > STbp->buffer_size && |
1589 | !enlarge_buffer(STbp, bufsize, STp->restr_dma)) { | |
b30d8bca HR |
1590 | st_printk(KERN_WARNING, STp, |
1591 | "Can't allocate %d byte tape buffer.\n", | |
1592 | bufsize); | |
1da177e4 LT |
1593 | retval = (-EOVERFLOW); |
1594 | goto out; | |
1595 | } | |
1596 | if (STp->block_size) | |
1597 | STbp->buffer_blocks = bufsize / STp->block_size; | |
1598 | } | |
1599 | ||
1600 | out: | |
1601 | return retval; | |
1602 | } | |
1603 | ||
1604 | ||
1605 | /* Can be called more than once after each setup_buffer() */ | |
787926b1 | 1606 | static void release_buffering(struct scsi_tape *STp, int is_read) |
1da177e4 LT |
1607 | { |
1608 | struct st_buffer *STbp; | |
1609 | ||
1610 | STbp = STp->buffer; | |
1611 | if (STbp->do_dio) { | |
6620742f | 1612 | sgl_unmap_user_pages(STbp, STbp->do_dio, is_read); |
1da177e4 | 1613 | STbp->do_dio = 0; |
787926b1 | 1614 | STbp->sg_segs = 0; |
1da177e4 LT |
1615 | } |
1616 | } | |
1617 | ||
1618 | ||
1619 | /* Write command */ | |
1620 | static ssize_t | |
1621 | st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
1622 | { | |
1623 | ssize_t total; | |
1624 | ssize_t i, do_count, blks, transfer; | |
1625 | ssize_t retval; | |
1626 | int undone, retry_eot = 0, scode; | |
1627 | int async_write; | |
1628 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
1629 | const char __user *b_point; | |
8b05b773 | 1630 | struct st_request *SRpnt = NULL; |
1da177e4 LT |
1631 | struct scsi_tape *STp = filp->private_data; |
1632 | struct st_modedef *STm; | |
1633 | struct st_partstat *STps; | |
1634 | struct st_buffer *STbp; | |
1da177e4 | 1635 | |
28f85009 | 1636 | if (mutex_lock_interruptible(&STp->lock)) |
1da177e4 LT |
1637 | return -ERESTARTSYS; |
1638 | ||
1639 | retval = rw_checks(STp, filp, count); | |
1640 | if (retval || count == 0) | |
1641 | goto out; | |
1642 | ||
1643 | /* Write must be integral number of blocks */ | |
1644 | if (STp->block_size != 0 && (count % STp->block_size) != 0) { | |
b30d8bca HR |
1645 | st_printk(KERN_WARNING, STp, |
1646 | "Write not multiple of tape block size.\n"); | |
1da177e4 LT |
1647 | retval = (-EINVAL); |
1648 | goto out; | |
1649 | } | |
1650 | ||
1651 | STm = &(STp->modes[STp->current_mode]); | |
1652 | STps = &(STp->ps[STp->partition]); | |
1653 | ||
1654 | if (STp->write_prot) { | |
1655 | retval = (-EACCES); | |
1656 | goto out; | |
1657 | } | |
1658 | ||
1659 | ||
1660 | if (STps->rw == ST_READING) { | |
1661 | retval = flush_buffer(STp, 0); | |
1662 | if (retval) | |
1663 | goto out; | |
1664 | STps->rw = ST_WRITING; | |
1665 | } else if (STps->rw != ST_WRITING && | |
1666 | STps->drv_file == 0 && STps->drv_block == 0) { | |
1667 | if ((retval = set_mode_densblk(STp, STm)) < 0) | |
1668 | goto out; | |
1669 | if (STm->default_compression != ST_DONT_TOUCH && | |
1670 | !(STp->compression_changed)) { | |
1671 | if (st_compression(STp, (STm->default_compression == ST_YES))) { | |
b30d8bca HR |
1672 | st_printk(KERN_WARNING, STp, |
1673 | "Can't set default compression.\n"); | |
1da177e4 LT |
1674 | if (modes_defined) { |
1675 | retval = (-EINVAL); | |
1676 | goto out; | |
1677 | } | |
1678 | } | |
1679 | } | |
1680 | } | |
1681 | ||
1682 | STbp = STp->buffer; | |
1683 | i = write_behind_check(STp); | |
1684 | if (i) { | |
1685 | if (i == -ENOSPC) | |
1686 | STps->eof = ST_EOM_OK; | |
1687 | else | |
1688 | STps->eof = ST_EOM_ERROR; | |
1689 | } | |
1690 | ||
1691 | if (STps->eof == ST_EOM_OK) { | |
1692 | STps->eof = ST_EOD_1; /* allow next write */ | |
1693 | retval = (-ENOSPC); | |
1694 | goto out; | |
1695 | } | |
1696 | else if (STps->eof == ST_EOM_ERROR) { | |
1697 | retval = (-EIO); | |
1698 | goto out; | |
1699 | } | |
1700 | ||
1701 | /* Check the buffer readability in cases where copy_user might catch | |
1702 | the problems after some tape movement. */ | |
1703 | if (STp->block_size != 0 && | |
1704 | !STbp->do_dio && | |
1705 | (copy_from_user(&i, buf, 1) != 0 || | |
1706 | copy_from_user(&i, buf + count - 1, 1) != 0)) { | |
1707 | retval = (-EFAULT); | |
1708 | goto out; | |
1709 | } | |
1710 | ||
1711 | retval = setup_buffering(STp, buf, count, 0); | |
1712 | if (retval) | |
1713 | goto out; | |
1714 | ||
1715 | total = count; | |
1716 | ||
1717 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1718 | cmd[0] = WRITE_6; | |
1719 | cmd[1] = (STp->block_size != 0); | |
1720 | ||
1721 | STps->rw = ST_WRITING; | |
1722 | ||
1723 | b_point = buf; | |
1724 | while (count > 0 && !retry_eot) { | |
1725 | ||
1726 | if (STbp->do_dio) { | |
1727 | do_count = count; | |
1728 | } | |
1729 | else { | |
1730 | if (STp->block_size == 0) | |
1731 | do_count = count; | |
1732 | else { | |
1733 | do_count = STbp->buffer_blocks * STp->block_size - | |
1734 | STbp->buffer_bytes; | |
1735 | if (do_count > count) | |
1736 | do_count = count; | |
1737 | } | |
1738 | ||
1739 | i = append_to_buffer(b_point, STbp, do_count); | |
1740 | if (i) { | |
1741 | retval = i; | |
1742 | goto out; | |
1743 | } | |
1744 | } | |
1745 | count -= do_count; | |
1746 | b_point += do_count; | |
1747 | ||
1748 | async_write = STp->block_size == 0 && !STbp->do_dio && | |
1749 | STm->do_async_writes && STps->eof < ST_EOM_OK; | |
1750 | ||
1751 | if (STp->block_size != 0 && STm->do_buffer_writes && | |
9abe16c6 | 1752 | !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK && |
1da177e4 LT |
1753 | STbp->buffer_bytes < STbp->buffer_size) { |
1754 | STp->dirty = 1; | |
1755 | /* Don't write a buffer that is not full enough. */ | |
1756 | if (!async_write && count == 0) | |
1757 | break; | |
1758 | } | |
1759 | ||
1760 | retry_write: | |
1761 | if (STp->block_size == 0) | |
1762 | blks = transfer = do_count; | |
1763 | else { | |
1764 | if (!STbp->do_dio) | |
1765 | blks = STbp->buffer_bytes; | |
1766 | else | |
1767 | blks = do_count; | |
1768 | blks /= STp->block_size; | |
1769 | transfer = blks * STp->block_size; | |
1770 | } | |
1771 | cmd[2] = blks >> 16; | |
1772 | cmd[3] = blks >> 8; | |
1773 | cmd[4] = blks; | |
1774 | ||
1775 | SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE, | |
a02488ed JB |
1776 | STp->device->request_queue->rq_timeout, |
1777 | MAX_WRITE_RETRIES, !async_write); | |
1da177e4 LT |
1778 | if (!SRpnt) { |
1779 | retval = STbp->syscall_result; | |
1780 | goto out; | |
1781 | } | |
8b05b773 | 1782 | if (async_write && !STbp->syscall_result) { |
1da177e4 LT |
1783 | STbp->writing = transfer; |
1784 | STp->dirty = !(STbp->writing == | |
1785 | STbp->buffer_bytes); | |
1786 | SRpnt = NULL; /* Prevent releasing this request! */ | |
1787 | DEB( STp->write_pending = 1; ) | |
1788 | break; | |
1789 | } | |
1790 | ||
1791 | if (STbp->syscall_result != 0) { | |
1792 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1793 | ||
b30d8bca | 1794 | DEBC_printk(STp, "Error on write:\n"); |
1da177e4 LT |
1795 | if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) { |
1796 | scode = cmdstatp->sense_hdr.sense_key; | |
1797 | if (cmdstatp->remainder_valid) | |
1798 | undone = (int)cmdstatp->uremainder64; | |
1799 | else if (STp->block_size == 0 && | |
1800 | scode == VOLUME_OVERFLOW) | |
1801 | undone = transfer; | |
1802 | else | |
1803 | undone = 0; | |
1804 | if (STp->block_size != 0) | |
1805 | undone *= STp->block_size; | |
1806 | if (undone <= do_count) { | |
1807 | /* Only data from this write is not written */ | |
1808 | count += undone; | |
626dcb1e | 1809 | b_point -= undone; |
1da177e4 LT |
1810 | do_count -= undone; |
1811 | if (STp->block_size) | |
1812 | blks = (transfer - undone) / STp->block_size; | |
1813 | STps->eof = ST_EOM_OK; | |
1814 | /* Continue in fixed block mode if all written | |
1815 | in this request but still something left to write | |
1816 | (retval left to zero) | |
1817 | */ | |
1818 | if (STp->block_size == 0 || | |
1819 | undone > 0 || count == 0) | |
1820 | retval = (-ENOSPC); /* EOM within current request */ | |
b30d8bca HR |
1821 | DEBC_printk(STp, "EOM with %d " |
1822 | "bytes unwritten.\n", | |
1823 | (int)count); | |
1da177e4 LT |
1824 | } else { |
1825 | /* EOT within data buffered earlier (possible only | |
1826 | in fixed block mode without direct i/o) */ | |
1827 | if (!retry_eot && !cmdstatp->deferred && | |
1828 | (scode == NO_SENSE || scode == RECOVERED_ERROR)) { | |
1829 | move_buffer_data(STp->buffer, transfer - undone); | |
1830 | retry_eot = 1; | |
1831 | if (STps->drv_block >= 0) { | |
1832 | STps->drv_block += (transfer - undone) / | |
1833 | STp->block_size; | |
1834 | } | |
1835 | STps->eof = ST_EOM_OK; | |
b30d8bca HR |
1836 | DEBC_printk(STp, "Retry " |
1837 | "write of %d " | |
1838 | "bytes at EOM.\n", | |
1839 | STp->buffer->buffer_bytes); | |
1da177e4 LT |
1840 | goto retry_write; |
1841 | } | |
1842 | else { | |
1843 | /* Either error within data buffered by driver or | |
1844 | failed retry */ | |
1845 | count -= do_count; | |
1846 | blks = do_count = 0; | |
1847 | STps->eof = ST_EOM_ERROR; | |
1848 | STps->drv_block = (-1); /* Too cautious? */ | |
1849 | retval = (-EIO); /* EOM for old data */ | |
b30d8bca HR |
1850 | DEBC_printk(STp, "EOM with " |
1851 | "lost data.\n"); | |
1da177e4 LT |
1852 | } |
1853 | } | |
1854 | } else { | |
1855 | count += do_count; | |
1856 | STps->drv_block = (-1); /* Too cautious? */ | |
8b05b773 | 1857 | retval = STbp->syscall_result; |
1da177e4 LT |
1858 | } |
1859 | ||
1860 | } | |
1861 | ||
1862 | if (STps->drv_block >= 0) { | |
1863 | if (STp->block_size == 0) | |
1864 | STps->drv_block += (do_count > 0); | |
1865 | else | |
1866 | STps->drv_block += blks; | |
1867 | } | |
1868 | ||
1869 | STbp->buffer_bytes = 0; | |
1870 | STp->dirty = 0; | |
1871 | ||
1872 | if (retval || retry_eot) { | |
1873 | if (count < total) | |
1874 | retval = total - count; | |
1875 | goto out; | |
1876 | } | |
1877 | } | |
1878 | ||
1879 | if (STps->eof == ST_EOD_1) | |
1880 | STps->eof = ST_EOM_OK; | |
1881 | else if (STps->eof != ST_EOM_OK) | |
1882 | STps->eof = ST_NOEOF; | |
1883 | retval = total - count; | |
1884 | ||
1885 | out: | |
1886 | if (SRpnt != NULL) | |
8b05b773 | 1887 | st_release_request(SRpnt); |
787926b1 | 1888 | release_buffering(STp, 0); |
28f85009 | 1889 | mutex_unlock(&STp->lock); |
1da177e4 LT |
1890 | |
1891 | return retval; | |
1892 | } | |
1893 | \f | |
1894 | /* Read data from the tape. Returns zero in the normal case, one if the | |
1895 | eof status has changed, and the negative error code in case of a | |
1896 | fatal error. Otherwise updates the buffer and the eof state. | |
1897 | ||
1898 | Does release user buffer mapping if it is set. | |
1899 | */ | |
1900 | static long read_tape(struct scsi_tape *STp, long count, | |
8b05b773 | 1901 | struct st_request ** aSRpnt) |
1da177e4 LT |
1902 | { |
1903 | int transfer, blks, bytes; | |
1904 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 1905 | struct st_request *SRpnt; |
1da177e4 LT |
1906 | struct st_modedef *STm; |
1907 | struct st_partstat *STps; | |
1908 | struct st_buffer *STbp; | |
1909 | int retval = 0; | |
1da177e4 LT |
1910 | |
1911 | if (count == 0) | |
1912 | return 0; | |
1913 | ||
1914 | STm = &(STp->modes[STp->current_mode]); | |
1915 | STps = &(STp->ps[STp->partition]); | |
1916 | if (STps->eof == ST_FM_HIT) | |
1917 | return 1; | |
1918 | STbp = STp->buffer; | |
1919 | ||
1920 | if (STp->block_size == 0) | |
1921 | blks = bytes = count; | |
1922 | else { | |
9abe16c6 | 1923 | if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) { |
1da177e4 LT |
1924 | blks = (STp->buffer)->buffer_blocks; |
1925 | bytes = blks * STp->block_size; | |
1926 | } else { | |
1927 | bytes = count; | |
1928 | if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size) | |
1929 | bytes = (STp->buffer)->buffer_size; | |
1930 | blks = bytes / STp->block_size; | |
1931 | bytes = blks * STp->block_size; | |
1932 | } | |
1933 | } | |
1934 | ||
1935 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
1936 | cmd[0] = READ_6; | |
1937 | cmd[1] = (STp->block_size != 0); | |
40f6b36c KM |
1938 | if (!cmd[1] && STp->sili) |
1939 | cmd[1] |= 2; | |
1da177e4 LT |
1940 | cmd[2] = blks >> 16; |
1941 | cmd[3] = blks >> 8; | |
1942 | cmd[4] = blks; | |
1943 | ||
1944 | SRpnt = *aSRpnt; | |
1945 | SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE, | |
a02488ed JB |
1946 | STp->device->request_queue->rq_timeout, |
1947 | MAX_RETRIES, 1); | |
787926b1 | 1948 | release_buffering(STp, 1); |
1da177e4 LT |
1949 | *aSRpnt = SRpnt; |
1950 | if (!SRpnt) | |
1951 | return STbp->syscall_result; | |
1952 | ||
1953 | STbp->read_pointer = 0; | |
1954 | STps->at_sm = 0; | |
1955 | ||
1956 | /* Something to check */ | |
1957 | if (STbp->syscall_result) { | |
1958 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
1959 | ||
1960 | retval = 1; | |
b30d8bca HR |
1961 | DEBC_printk(STp, |
1962 | "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", | |
1963 | SRpnt->sense[0], SRpnt->sense[1], | |
1964 | SRpnt->sense[2], SRpnt->sense[3], | |
1965 | SRpnt->sense[4], SRpnt->sense[5], | |
1966 | SRpnt->sense[6], SRpnt->sense[7]); | |
1da177e4 LT |
1967 | if (cmdstatp->have_sense) { |
1968 | ||
1969 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) | |
1970 | cmdstatp->flags &= 0xcf; /* No need for EOM in this case */ | |
1971 | ||
1972 | if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */ | |
1973 | /* Compute the residual count */ | |
1974 | if (cmdstatp->remainder_valid) | |
1975 | transfer = (int)cmdstatp->uremainder64; | |
1976 | else | |
1977 | transfer = 0; | |
1978 | if (STp->block_size == 0 && | |
1979 | cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) | |
1980 | transfer = bytes; | |
1981 | ||
1982 | if (cmdstatp->flags & SENSE_ILI) { /* ILI */ | |
b30d8bca HR |
1983 | if (STp->block_size == 0 && |
1984 | transfer < 0) { | |
1985 | st_printk(KERN_NOTICE, STp, | |
1986 | "Failed to read %d " | |
1987 | "byte block with %d " | |
1988 | "byte transfer.\n", | |
1989 | bytes - transfer, | |
1990 | bytes); | |
1991 | if (STps->drv_block >= 0) | |
1992 | STps->drv_block += 1; | |
1993 | STbp->buffer_bytes = 0; | |
1994 | return (-ENOMEM); | |
1995 | } else if (STp->block_size == 0) { | |
1da177e4 LT |
1996 | STbp->buffer_bytes = bytes - transfer; |
1997 | } else { | |
8b05b773 | 1998 | st_release_request(SRpnt); |
1da177e4 LT |
1999 | SRpnt = *aSRpnt = NULL; |
2000 | if (transfer == blks) { /* We did not get anything, error */ | |
b30d8bca HR |
2001 | st_printk(KERN_NOTICE, STp, |
2002 | "Incorrect " | |
2003 | "block size.\n"); | |
1da177e4 LT |
2004 | if (STps->drv_block >= 0) |
2005 | STps->drv_block += blks - transfer + 1; | |
2006 | st_int_ioctl(STp, MTBSR, 1); | |
2007 | return (-EIO); | |
2008 | } | |
2009 | /* We have some data, deliver it */ | |
2010 | STbp->buffer_bytes = (blks - transfer) * | |
2011 | STp->block_size; | |
b30d8bca HR |
2012 | DEBC_printk(STp, "ILI but " |
2013 | "enough data " | |
2014 | "received %ld " | |
2015 | "%d.\n", count, | |
2016 | STbp->buffer_bytes); | |
1da177e4 LT |
2017 | if (STps->drv_block >= 0) |
2018 | STps->drv_block += 1; | |
2019 | if (st_int_ioctl(STp, MTBSR, 1)) | |
2020 | return (-EIO); | |
2021 | } | |
2022 | } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */ | |
2023 | if (STps->eof != ST_FM_HIT) | |
2024 | STps->eof = ST_FM_HIT; | |
2025 | else | |
2026 | STps->eof = ST_EOD_2; | |
2027 | if (STp->block_size == 0) | |
2028 | STbp->buffer_bytes = 0; | |
2029 | else | |
2030 | STbp->buffer_bytes = | |
2031 | bytes - transfer * STp->block_size; | |
b30d8bca HR |
2032 | DEBC_printk(STp, "EOF detected (%d " |
2033 | "bytes read).\n", | |
2034 | STbp->buffer_bytes); | |
1da177e4 LT |
2035 | } else if (cmdstatp->flags & SENSE_EOM) { |
2036 | if (STps->eof == ST_FM) | |
2037 | STps->eof = ST_EOD_1; | |
2038 | else | |
2039 | STps->eof = ST_EOM_OK; | |
2040 | if (STp->block_size == 0) | |
2041 | STbp->buffer_bytes = bytes - transfer; | |
2042 | else | |
2043 | STbp->buffer_bytes = | |
2044 | bytes - transfer * STp->block_size; | |
2045 | ||
b30d8bca HR |
2046 | DEBC_printk(STp, "EOM detected (%d " |
2047 | "bytes read).\n", | |
2048 | STbp->buffer_bytes); | |
1da177e4 LT |
2049 | } |
2050 | } | |
b30d8bca | 2051 | /* end of EOF, EOM, ILI test */ |
1da177e4 | 2052 | else { /* nonzero sense key */ |
b30d8bca | 2053 | DEBC_printk(STp, "Tape error while reading.\n"); |
1da177e4 LT |
2054 | STps->drv_block = (-1); |
2055 | if (STps->eof == ST_FM && | |
2056 | cmdstatp->sense_hdr.sense_key == BLANK_CHECK) { | |
b30d8bca HR |
2057 | DEBC_printk(STp, "Zero returned for " |
2058 | "first BLANK CHECK " | |
2059 | "after EOF.\n"); | |
1da177e4 LT |
2060 | STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */ |
2061 | } else /* Some other extended sense code */ | |
2062 | retval = (-EIO); | |
2063 | } | |
2064 | ||
2065 | if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */ | |
2066 | STbp->buffer_bytes = 0; | |
2067 | } | |
b30d8bca | 2068 | /* End of extended sense test */ |
1da177e4 LT |
2069 | else { /* Non-extended sense */ |
2070 | retval = STbp->syscall_result; | |
2071 | } | |
2072 | ||
2073 | } | |
b30d8bca | 2074 | /* End of error handling */ |
40f6b36c | 2075 | else { /* Read successful */ |
1da177e4 | 2076 | STbp->buffer_bytes = bytes; |
40f6b36c KM |
2077 | if (STp->sili) /* In fixed block mode residual is always zero here */ |
2078 | STbp->buffer_bytes -= STp->buffer->cmdstat.residual; | |
2079 | } | |
1da177e4 LT |
2080 | |
2081 | if (STps->drv_block >= 0) { | |
2082 | if (STp->block_size == 0) | |
2083 | STps->drv_block++; | |
2084 | else | |
2085 | STps->drv_block += STbp->buffer_bytes / STp->block_size; | |
2086 | } | |
2087 | return retval; | |
2088 | } | |
2089 | \f | |
2090 | ||
2091 | /* Read command */ | |
2092 | static ssize_t | |
2093 | st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
2094 | { | |
2095 | ssize_t total; | |
2096 | ssize_t retval = 0; | |
2097 | ssize_t i, transfer; | |
2098 | int special, do_dio = 0; | |
8b05b773 | 2099 | struct st_request *SRpnt = NULL; |
1da177e4 LT |
2100 | struct scsi_tape *STp = filp->private_data; |
2101 | struct st_modedef *STm; | |
2102 | struct st_partstat *STps; | |
2103 | struct st_buffer *STbp = STp->buffer; | |
1da177e4 | 2104 | |
28f85009 | 2105 | if (mutex_lock_interruptible(&STp->lock)) |
1da177e4 LT |
2106 | return -ERESTARTSYS; |
2107 | ||
2108 | retval = rw_checks(STp, filp, count); | |
2109 | if (retval || count == 0) | |
2110 | goto out; | |
2111 | ||
2112 | STm = &(STp->modes[STp->current_mode]); | |
9abe16c6 KM |
2113 | if (STp->block_size != 0 && (count % STp->block_size) != 0) { |
2114 | if (!STm->do_read_ahead) { | |
2115 | retval = (-EINVAL); /* Read must be integral number of blocks */ | |
2116 | goto out; | |
2117 | } | |
2118 | STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */ | |
1da177e4 LT |
2119 | } |
2120 | ||
2121 | STps = &(STp->ps[STp->partition]); | |
2122 | if (STps->rw == ST_WRITING) { | |
2123 | retval = flush_buffer(STp, 0); | |
2124 | if (retval) | |
2125 | goto out; | |
2126 | STps->rw = ST_READING; | |
2127 | } | |
b30d8bca | 2128 | DEB( |
1da177e4 | 2129 | if (debugging && STps->eof != ST_NOEOF) |
b30d8bca HR |
2130 | st_printk(ST_DEB_MSG, STp, |
2131 | "EOF/EOM flag up (%d). Bytes %d\n", | |
2132 | STps->eof, STbp->buffer_bytes); | |
2133 | ) /* end DEB */ | |
1da177e4 LT |
2134 | |
2135 | retval = setup_buffering(STp, buf, count, 1); | |
2136 | if (retval) | |
2137 | goto out; | |
2138 | do_dio = STbp->do_dio; | |
2139 | ||
2140 | if (STbp->buffer_bytes == 0 && | |
2141 | STps->eof >= ST_EOD_1) { | |
2142 | if (STps->eof < ST_EOD) { | |
2143 | STps->eof += 1; | |
2144 | retval = 0; | |
2145 | goto out; | |
2146 | } | |
2147 | retval = (-EIO); /* EOM or Blank Check */ | |
2148 | goto out; | |
2149 | } | |
2150 | ||
2151 | if (do_dio) { | |
2152 | /* Check the buffer writability before any tape movement. Don't alter | |
2153 | buffer data. */ | |
2154 | if (copy_from_user(&i, buf, 1) != 0 || | |
2155 | copy_to_user(buf, &i, 1) != 0 || | |
2156 | copy_from_user(&i, buf + count - 1, 1) != 0 || | |
2157 | copy_to_user(buf + count - 1, &i, 1) != 0) { | |
2158 | retval = (-EFAULT); | |
2159 | goto out; | |
2160 | } | |
2161 | } | |
2162 | ||
2163 | STps->rw = ST_READING; | |
2164 | ||
2165 | ||
2166 | /* Loop until enough data in buffer or a special condition found */ | |
2167 | for (total = 0, special = 0; total < count && !special;) { | |
2168 | ||
2169 | /* Get new data if the buffer is empty */ | |
2170 | if (STbp->buffer_bytes == 0) { | |
2171 | special = read_tape(STp, count - total, &SRpnt); | |
2172 | if (special < 0) { /* No need to continue read */ | |
2173 | retval = special; | |
2174 | goto out; | |
2175 | } | |
2176 | } | |
2177 | ||
2178 | /* Move the data from driver buffer to user buffer */ | |
2179 | if (STbp->buffer_bytes > 0) { | |
b30d8bca | 2180 | DEB( |
1da177e4 | 2181 | if (debugging && STps->eof != ST_NOEOF) |
b30d8bca HR |
2182 | st_printk(ST_DEB_MSG, STp, |
2183 | "EOF up (%d). Left %d, needed %d.\n", | |
2184 | STps->eof, STbp->buffer_bytes, | |
2185 | (int)(count - total)); | |
2186 | ) /* end DEB */ | |
1da177e4 LT |
2187 | transfer = STbp->buffer_bytes < count - total ? |
2188 | STbp->buffer_bytes : count - total; | |
2189 | if (!do_dio) { | |
2190 | i = from_buffer(STbp, buf, transfer); | |
2191 | if (i) { | |
2192 | retval = i; | |
2193 | goto out; | |
2194 | } | |
2195 | } | |
2196 | buf += transfer; | |
2197 | total += transfer; | |
2198 | } | |
2199 | ||
2200 | if (STp->block_size == 0) | |
2201 | break; /* Read only one variable length block */ | |
2202 | ||
2203 | } /* for (total = 0, special = 0; | |
2204 | total < count && !special; ) */ | |
2205 | ||
2206 | /* Change the eof state if no data from tape or buffer */ | |
2207 | if (total == 0) { | |
2208 | if (STps->eof == ST_FM_HIT) { | |
2209 | STps->eof = ST_FM; | |
2210 | STps->drv_block = 0; | |
2211 | if (STps->drv_file >= 0) | |
2212 | STps->drv_file++; | |
2213 | } else if (STps->eof == ST_EOD_1) { | |
2214 | STps->eof = ST_EOD_2; | |
2215 | STps->drv_block = 0; | |
2216 | if (STps->drv_file >= 0) | |
2217 | STps->drv_file++; | |
2218 | } else if (STps->eof == ST_EOD_2) | |
2219 | STps->eof = ST_EOD; | |
2220 | } else if (STps->eof == ST_FM) | |
2221 | STps->eof = ST_NOEOF; | |
2222 | retval = total; | |
2223 | ||
2224 | out: | |
2225 | if (SRpnt != NULL) { | |
8b05b773 | 2226 | st_release_request(SRpnt); |
1da177e4 LT |
2227 | SRpnt = NULL; |
2228 | } | |
2229 | if (do_dio) { | |
787926b1 | 2230 | release_buffering(STp, 1); |
1da177e4 LT |
2231 | STbp->buffer_bytes = 0; |
2232 | } | |
28f85009 | 2233 | mutex_unlock(&STp->lock); |
1da177e4 LT |
2234 | |
2235 | return retval; | |
2236 | } | |
2237 | \f | |
2238 | ||
2239 | ||
2240 | DEB( | |
2241 | /* Set the driver options */ | |
b30d8bca | 2242 | static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm) |
1da177e4 LT |
2243 | { |
2244 | if (debugging) { | |
b30d8bca HR |
2245 | st_printk(KERN_INFO, STp, |
2246 | "Mode %d options: buffer writes: %d, " | |
2247 | "async writes: %d, read ahead: %d\n", | |
2248 | STp->current_mode, STm->do_buffer_writes, | |
2249 | STm->do_async_writes, STm->do_read_ahead); | |
2250 | st_printk(KERN_INFO, STp, | |
2251 | " can bsr: %d, two FMs: %d, " | |
2252 | "fast mteom: %d, auto lock: %d,\n", | |
2253 | STp->can_bsr, STp->two_fm, STp->fast_mteom, | |
2254 | STp->do_auto_lock); | |
2255 | st_printk(KERN_INFO, STp, | |
2256 | " defs for wr: %d, no block limits: %d, " | |
2257 | "partitions: %d, s2 log: %d\n", | |
2258 | STm->defaults_for_writes, STp->omit_blklims, | |
2259 | STp->can_partitions, STp->scsi2_logical); | |
2260 | st_printk(KERN_INFO, STp, | |
2261 | " sysv: %d nowait: %d sili: %d " | |
2262 | "nowait_filemark: %d\n", | |
2263 | STm->sysv, STp->immediate, STp->sili, | |
2264 | STp->immediate_filemark); | |
2265 | st_printk(KERN_INFO, STp, " debugging: %d\n", debugging); | |
1da177e4 LT |
2266 | } |
2267 | } | |
2268 | ) | |
2269 | ||
2270 | ||
2271 | static int st_set_options(struct scsi_tape *STp, long options) | |
2272 | { | |
2273 | int value; | |
2274 | long code; | |
2275 | struct st_modedef *STm; | |
1da177e4 | 2276 | struct cdev *cd0, *cd1; |
d6216c47 | 2277 | struct device *d0, *d1; |
1da177e4 LT |
2278 | |
2279 | STm = &(STp->modes[STp->current_mode]); | |
2280 | if (!STm->defined) { | |
d6216c47 ML |
2281 | cd0 = STm->cdevs[0]; |
2282 | cd1 = STm->cdevs[1]; | |
2283 | d0 = STm->devs[0]; | |
2284 | d1 = STm->devs[1]; | |
1da177e4 | 2285 | memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); |
d6216c47 ML |
2286 | STm->cdevs[0] = cd0; |
2287 | STm->cdevs[1] = cd1; | |
2288 | STm->devs[0] = d0; | |
2289 | STm->devs[1] = d1; | |
1da177e4 | 2290 | modes_defined = 1; |
b30d8bca HR |
2291 | DEBC_printk(STp, "Initialized mode %d definition from mode 0\n", |
2292 | STp->current_mode); | |
1da177e4 LT |
2293 | } |
2294 | ||
2295 | code = options & MT_ST_OPTIONS; | |
2296 | if (code == MT_ST_BOOLEANS) { | |
2297 | STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; | |
2298 | STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; | |
2299 | STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; | |
2300 | STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; | |
2301 | STp->two_fm = (options & MT_ST_TWO_FM) != 0; | |
2302 | STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; | |
2303 | STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; | |
2304 | STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; | |
2305 | STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; | |
2306 | if ((STp->device)->scsi_level >= SCSI_2) | |
2307 | STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; | |
2308 | STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; | |
2309 | STp->immediate = (options & MT_ST_NOWAIT) != 0; | |
c743e44f | 2310 | STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0; |
1da177e4 | 2311 | STm->sysv = (options & MT_ST_SYSV) != 0; |
40f6b36c | 2312 | STp->sili = (options & MT_ST_SILI) != 0; |
1da177e4 | 2313 | DEB( debugging = (options & MT_ST_DEBUGGING) != 0; |
b30d8bca | 2314 | st_log_options(STp, STm); ) |
1da177e4 LT |
2315 | } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { |
2316 | value = (code == MT_ST_SETBOOLEANS); | |
2317 | if ((options & MT_ST_BUFFER_WRITES) != 0) | |
2318 | STm->do_buffer_writes = value; | |
2319 | if ((options & MT_ST_ASYNC_WRITES) != 0) | |
2320 | STm->do_async_writes = value; | |
2321 | if ((options & MT_ST_DEF_WRITES) != 0) | |
2322 | STm->defaults_for_writes = value; | |
2323 | if ((options & MT_ST_READ_AHEAD) != 0) | |
2324 | STm->do_read_ahead = value; | |
2325 | if ((options & MT_ST_TWO_FM) != 0) | |
2326 | STp->two_fm = value; | |
2327 | if ((options & MT_ST_FAST_MTEOM) != 0) | |
2328 | STp->fast_mteom = value; | |
2329 | if ((options & MT_ST_AUTO_LOCK) != 0) | |
2330 | STp->do_auto_lock = value; | |
2331 | if ((options & MT_ST_CAN_BSR) != 0) | |
2332 | STp->can_bsr = value; | |
2333 | if ((options & MT_ST_NO_BLKLIMS) != 0) | |
2334 | STp->omit_blklims = value; | |
2335 | if ((STp->device)->scsi_level >= SCSI_2 && | |
2336 | (options & MT_ST_CAN_PARTITIONS) != 0) | |
2337 | STp->can_partitions = value; | |
2338 | if ((options & MT_ST_SCSI2LOGICAL) != 0) | |
2339 | STp->scsi2_logical = value; | |
2340 | if ((options & MT_ST_NOWAIT) != 0) | |
2341 | STp->immediate = value; | |
c743e44f LD |
2342 | if ((options & MT_ST_NOWAIT_EOF) != 0) |
2343 | STp->immediate_filemark = value; | |
1da177e4 LT |
2344 | if ((options & MT_ST_SYSV) != 0) |
2345 | STm->sysv = value; | |
40f6b36c KM |
2346 | if ((options & MT_ST_SILI) != 0) |
2347 | STp->sili = value; | |
b30d8bca | 2348 | DEB( |
1da177e4 LT |
2349 | if ((options & MT_ST_DEBUGGING) != 0) |
2350 | debugging = value; | |
b30d8bca | 2351 | st_log_options(STp, STm); ) |
1da177e4 LT |
2352 | } else if (code == MT_ST_WRITE_THRESHOLD) { |
2353 | /* Retained for compatibility */ | |
2354 | } else if (code == MT_ST_DEF_BLKSIZE) { | |
2355 | value = (options & ~MT_ST_OPTIONS); | |
2356 | if (value == ~MT_ST_OPTIONS) { | |
2357 | STm->default_blksize = (-1); | |
b30d8bca | 2358 | DEBC_printk(STp, "Default block size disabled.\n"); |
1da177e4 LT |
2359 | } else { |
2360 | STm->default_blksize = value; | |
b30d8bca HR |
2361 | DEBC_printk(STp,"Default block size set to " |
2362 | "%d bytes.\n", STm->default_blksize); | |
1da177e4 LT |
2363 | if (STp->ready == ST_READY) { |
2364 | STp->blksize_changed = 0; | |
2365 | set_mode_densblk(STp, STm); | |
2366 | } | |
2367 | } | |
2368 | } else if (code == MT_ST_TIMEOUTS) { | |
2369 | value = (options & ~MT_ST_OPTIONS); | |
2370 | if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { | |
2371 | STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; | |
b30d8bca HR |
2372 | DEBC_printk(STp, "Long timeout set to %d seconds.\n", |
2373 | (value & ~MT_ST_SET_LONG_TIMEOUT)); | |
1da177e4 | 2374 | } else { |
a02488ed JB |
2375 | blk_queue_rq_timeout(STp->device->request_queue, |
2376 | value * HZ); | |
b30d8bca HR |
2377 | DEBC_printk(STp, "Normal timeout set to %d seconds.\n", |
2378 | value); | |
1da177e4 LT |
2379 | } |
2380 | } else if (code == MT_ST_SET_CLN) { | |
2381 | value = (options & ~MT_ST_OPTIONS) & 0xff; | |
2382 | if (value != 0 && | |
832151f4 RK |
2383 | (value < EXTENDED_SENSE_START || |
2384 | value >= SCSI_SENSE_BUFFERSIZE)) | |
1da177e4 LT |
2385 | return (-EINVAL); |
2386 | STp->cln_mode = value; | |
2387 | STp->cln_sense_mask = (options >> 8) & 0xff; | |
2388 | STp->cln_sense_value = (options >> 16) & 0xff; | |
b30d8bca HR |
2389 | st_printk(KERN_INFO, STp, |
2390 | "Cleaning request mode %d, mask %02x, value %02x\n", | |
2391 | value, STp->cln_sense_mask, STp->cln_sense_value); | |
1da177e4 LT |
2392 | } else if (code == MT_ST_DEF_OPTIONS) { |
2393 | code = (options & ~MT_ST_CLEAR_DEFAULT); | |
2394 | value = (options & MT_ST_CLEAR_DEFAULT); | |
2395 | if (code == MT_ST_DEF_DENSITY) { | |
2396 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2397 | STm->default_density = (-1); | |
b30d8bca HR |
2398 | DEBC_printk(STp, |
2399 | "Density default disabled.\n"); | |
1da177e4 LT |
2400 | } else { |
2401 | STm->default_density = value & 0xff; | |
b30d8bca HR |
2402 | DEBC_printk(STp, "Density default set to %x\n", |
2403 | STm->default_density); | |
1da177e4 LT |
2404 | if (STp->ready == ST_READY) { |
2405 | STp->density_changed = 0; | |
2406 | set_mode_densblk(STp, STm); | |
2407 | } | |
2408 | } | |
2409 | } else if (code == MT_ST_DEF_DRVBUFFER) { | |
2410 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2411 | STp->default_drvbuffer = 0xff; | |
b30d8bca HR |
2412 | DEBC_printk(STp, |
2413 | "Drive buffer default disabled.\n"); | |
1da177e4 LT |
2414 | } else { |
2415 | STp->default_drvbuffer = value & 7; | |
b30d8bca HR |
2416 | DEBC_printk(STp, |
2417 | "Drive buffer default set to %x\n", | |
2418 | STp->default_drvbuffer); | |
1da177e4 LT |
2419 | if (STp->ready == ST_READY) |
2420 | st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer); | |
2421 | } | |
2422 | } else if (code == MT_ST_DEF_COMPRESSION) { | |
2423 | if (value == MT_ST_CLEAR_DEFAULT) { | |
2424 | STm->default_compression = ST_DONT_TOUCH; | |
b30d8bca HR |
2425 | DEBC_printk(STp, |
2426 | "Compression default disabled.\n"); | |
1da177e4 LT |
2427 | } else { |
2428 | if ((value & 0xff00) != 0) { | |
2429 | STp->c_algo = (value & 0xff00) >> 8; | |
b30d8bca HR |
2430 | DEBC_printk(STp, "Compression " |
2431 | "algorithm set to 0x%x.\n", | |
2432 | STp->c_algo); | |
1da177e4 LT |
2433 | } |
2434 | if ((value & 0xff) != 0xff) { | |
2435 | STm->default_compression = (value & 1 ? ST_YES : ST_NO); | |
b30d8bca HR |
2436 | DEBC_printk(STp, "Compression default " |
2437 | "set to %x\n", | |
2438 | (value & 1)); | |
1da177e4 LT |
2439 | if (STp->ready == ST_READY) { |
2440 | STp->compression_changed = 0; | |
2441 | st_compression(STp, (STm->default_compression == ST_YES)); | |
2442 | } | |
2443 | } | |
2444 | } | |
2445 | } | |
2446 | } else | |
2447 | return (-EIO); | |
2448 | ||
2449 | return 0; | |
2450 | } | |
2451 | \f | |
2452 | #define MODE_HEADER_LENGTH 4 | |
2453 | ||
2454 | /* Mode header and page byte offsets */ | |
2455 | #define MH_OFF_DATA_LENGTH 0 | |
2456 | #define MH_OFF_MEDIUM_TYPE 1 | |
2457 | #define MH_OFF_DEV_SPECIFIC 2 | |
2458 | #define MH_OFF_BDESCS_LENGTH 3 | |
2459 | #define MP_OFF_PAGE_NBR 0 | |
2460 | #define MP_OFF_PAGE_LENGTH 1 | |
2461 | ||
2462 | /* Mode header and page bit masks */ | |
2463 | #define MH_BIT_WP 0x80 | |
2464 | #define MP_MSK_PAGE_NBR 0x3f | |
2465 | ||
2466 | /* Don't return block descriptors */ | |
2467 | #define MODE_SENSE_OMIT_BDESCS 0x08 | |
2468 | ||
2469 | #define MODE_SELECT_PAGE_FORMAT 0x10 | |
2470 | ||
2471 | /* Read a mode page into the tape buffer. The block descriptors are included | |
2472 | if incl_block_descs is true. The page control is ored to the page number | |
2473 | parameter, if necessary. */ | |
2474 | static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) | |
2475 | { | |
2476 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8ecf0d99 | 2477 | struct st_request *SRpnt; |
1da177e4 LT |
2478 | |
2479 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2480 | cmd[0] = MODE_SENSE; | |
2481 | if (omit_block_descs) | |
2482 | cmd[1] = MODE_SENSE_OMIT_BDESCS; | |
2483 | cmd[2] = page; | |
2484 | cmd[4] = 255; | |
2485 | ||
02ae2c0e KM |
2486 | SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE, |
2487 | STp->device->request_queue->rq_timeout, 0, 1); | |
2488 | if (SRpnt == NULL) | |
2489 | return (STp->buffer)->syscall_result; | |
1da177e4 | 2490 | |
8b05b773 | 2491 | st_release_request(SRpnt); |
1da177e4 | 2492 | |
02ae2c0e | 2493 | return STp->buffer->syscall_result; |
1da177e4 LT |
2494 | } |
2495 | ||
2496 | ||
2497 | /* Send the mode page in the tape buffer to the drive. Assumes that the mode data | |
2498 | in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ | |
2499 | static int write_mode_page(struct scsi_tape *STp, int page, int slow) | |
2500 | { | |
02ae2c0e | 2501 | int pgo; |
1da177e4 | 2502 | unsigned char cmd[MAX_COMMAND_SIZE]; |
18c87015 | 2503 | struct st_request *SRpnt; |
02ae2c0e | 2504 | int timeout; |
1da177e4 LT |
2505 | |
2506 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2507 | cmd[0] = MODE_SELECT; | |
2508 | cmd[1] = MODE_SELECT_PAGE_FORMAT; | |
2509 | pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH]; | |
2510 | cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2; | |
2511 | ||
2512 | /* Clear reserved fields */ | |
2513 | (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0; | |
2514 | (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0; | |
2515 | (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; | |
2516 | (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; | |
2517 | ||
02ae2c0e KM |
2518 | timeout = slow ? |
2519 | STp->long_timeout : STp->device->request_queue->rq_timeout; | |
2520 | SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE, | |
2521 | timeout, 0, 1); | |
2522 | if (SRpnt == NULL) | |
2523 | return (STp->buffer)->syscall_result; | |
1da177e4 | 2524 | |
8b05b773 | 2525 | st_release_request(SRpnt); |
1da177e4 | 2526 | |
02ae2c0e | 2527 | return STp->buffer->syscall_result; |
1da177e4 LT |
2528 | } |
2529 | ||
2530 | ||
2531 | #define COMPRESSION_PAGE 0x0f | |
2532 | #define COMPRESSION_PAGE_LENGTH 16 | |
2533 | ||
2534 | #define CP_OFF_DCE_DCC 2 | |
2535 | #define CP_OFF_C_ALGO 7 | |
2536 | ||
2537 | #define DCE_MASK 0x80 | |
2538 | #define DCC_MASK 0x40 | |
2539 | #define RED_MASK 0x60 | |
2540 | ||
2541 | ||
2542 | /* Control the compression with mode page 15. Algorithm not changed if zero. | |
2543 | ||
2544 | The block descriptors are read and written because Sony SDT-7000 does not | |
2545 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). | |
2546 | Including block descriptors should not cause any harm to other drives. */ | |
2547 | ||
2548 | static int st_compression(struct scsi_tape * STp, int state) | |
2549 | { | |
2550 | int retval; | |
2551 | int mpoffs; /* Offset to mode page start */ | |
2552 | unsigned char *b_data = (STp->buffer)->b_data; | |
1da177e4 LT |
2553 | |
2554 | if (STp->ready != ST_READY) | |
2555 | return (-EIO); | |
2556 | ||
2557 | /* Read the current page contents */ | |
2558 | retval = read_mode_page(STp, COMPRESSION_PAGE, 0); | |
2559 | if (retval) { | |
b30d8bca | 2560 | DEBC_printk(STp, "Compression mode page not supported.\n"); |
1da177e4 LT |
2561 | return (-EIO); |
2562 | } | |
2563 | ||
2564 | mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; | |
b30d8bca HR |
2565 | DEBC_printk(STp, "Compression state is %d.\n", |
2566 | (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0)); | |
1da177e4 LT |
2567 | |
2568 | /* Check if compression can be changed */ | |
2569 | if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) { | |
b30d8bca | 2570 | DEBC_printk(STp, "Compression not supported.\n"); |
1da177e4 LT |
2571 | return (-EIO); |
2572 | } | |
2573 | ||
2574 | /* Do the change */ | |
2575 | if (state) { | |
2576 | b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK; | |
2577 | if (STp->c_algo != 0) | |
2578 | b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo; | |
2579 | } | |
2580 | else { | |
2581 | b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK; | |
2582 | if (STp->c_algo != 0) | |
2583 | b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */ | |
2584 | } | |
2585 | ||
2586 | retval = write_mode_page(STp, COMPRESSION_PAGE, 0); | |
2587 | if (retval) { | |
b30d8bca | 2588 | DEBC_printk(STp, "Compression change failed.\n"); |
1da177e4 LT |
2589 | return (-EIO); |
2590 | } | |
b30d8bca | 2591 | DEBC_printk(STp, "Compression state changed to %d.\n", state); |
1da177e4 LT |
2592 | |
2593 | STp->compression_changed = 1; | |
2594 | return 0; | |
2595 | } | |
2596 | ||
2597 | ||
2598 | /* Process the load and unload commands (does unload if the load code is zero) */ | |
2599 | static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code) | |
2600 | { | |
2601 | int retval = (-EIO), timeout; | |
1da177e4 LT |
2602 | unsigned char cmd[MAX_COMMAND_SIZE]; |
2603 | struct st_partstat *STps; | |
8b05b773 | 2604 | struct st_request *SRpnt; |
1da177e4 LT |
2605 | |
2606 | if (STp->ready != ST_READY && !load_code) { | |
2607 | if (STp->ready == ST_NO_TAPE) | |
2608 | return (-ENOMEDIUM); | |
2609 | else | |
2610 | return (-EIO); | |
2611 | } | |
2612 | ||
2613 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2614 | cmd[0] = START_STOP; | |
2615 | if (load_code) | |
2616 | cmd[4] |= 1; | |
2617 | /* | |
2618 | * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A | |
2619 | */ | |
2620 | if (load_code >= 1 + MT_ST_HPLOADER_OFFSET | |
2621 | && load_code <= 6 + MT_ST_HPLOADER_OFFSET) { | |
b30d8bca HR |
2622 | DEBC_printk(STp, " Enhanced %sload slot %2d.\n", |
2623 | (cmd[4]) ? "" : "un", | |
2624 | load_code - MT_ST_HPLOADER_OFFSET); | |
1da177e4 LT |
2625 | cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ |
2626 | } | |
2627 | if (STp->immediate) { | |
2628 | cmd[1] = 1; /* Don't wait for completion */ | |
a02488ed | 2629 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
2630 | } |
2631 | else | |
2632 | timeout = STp->long_timeout; | |
2633 | ||
2634 | DEBC( | |
2635 | if (!load_code) | |
b30d8bca | 2636 | st_printk(ST_DEB_MSG, STp, "Unloading tape.\n"); |
1da177e4 | 2637 | else |
b30d8bca | 2638 | st_printk(ST_DEB_MSG, STp, "Loading tape.\n"); |
1da177e4 LT |
2639 | ); |
2640 | ||
02ae2c0e KM |
2641 | SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
2642 | timeout, MAX_RETRIES, 1); | |
1da177e4 | 2643 | if (!SRpnt) |
02ae2c0e | 2644 | return (STp->buffer)->syscall_result; |
1da177e4 LT |
2645 | |
2646 | retval = (STp->buffer)->syscall_result; | |
02ae2c0e | 2647 | st_release_request(SRpnt); |
1da177e4 LT |
2648 | |
2649 | if (!retval) { /* SCSI command successful */ | |
2650 | ||
2651 | if (!load_code) { | |
2652 | STp->rew_at_close = 0; | |
2653 | STp->ready = ST_NO_TAPE; | |
2654 | } | |
2655 | else { | |
2656 | STp->rew_at_close = STp->autorew_dev; | |
2657 | retval = check_tape(STp, filp); | |
2658 | if (retval > 0) | |
2659 | retval = 0; | |
2660 | } | |
2661 | } | |
2662 | else { | |
2663 | STps = &(STp->ps[STp->partition]); | |
2664 | STps->drv_file = STps->drv_block = (-1); | |
2665 | } | |
2666 | ||
2667 | return retval; | |
2668 | } | |
2669 | \f | |
2670 | #if DEBUG | |
2671 | #define ST_DEB_FORWARD 0 | |
2672 | #define ST_DEB_BACKWARD 1 | |
b30d8bca | 2673 | static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) |
1da177e4 LT |
2674 | { |
2675 | s32 sc; | |
2676 | ||
b30d8bca HR |
2677 | if (!debugging) |
2678 | return; | |
2679 | ||
1da177e4 LT |
2680 | sc = cmd[2] & 0x80 ? 0xff000000 : 0; |
2681 | sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; | |
2682 | if (direction) | |
2683 | sc = -sc; | |
b30d8bca HR |
2684 | st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n", |
2685 | direction ? "backward" : "forward", sc, units); | |
1da177e4 | 2686 | } |
b30d8bca HR |
2687 | #else |
2688 | #define ST_DEB_FORWARD 0 | |
2689 | #define ST_DEB_BACKWARD 1 | |
2690 | static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {} | |
1da177e4 LT |
2691 | #endif |
2692 | ||
2693 | ||
2694 | /* Internal ioctl function */ | |
2695 | static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) | |
2696 | { | |
2697 | int timeout; | |
2698 | long ltmp; | |
2699 | int ioctl_result; | |
2700 | int chg_eof = 1; | |
2701 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 2702 | struct st_request *SRpnt; |
1da177e4 LT |
2703 | struct st_partstat *STps; |
2704 | int fileno, blkno, at_sm, undone; | |
2705 | int datalen = 0, direction = DMA_NONE; | |
1da177e4 LT |
2706 | |
2707 | WARN_ON(STp->buffer->do_dio != 0); | |
2708 | if (STp->ready != ST_READY) { | |
2709 | if (STp->ready == ST_NO_TAPE) | |
2710 | return (-ENOMEDIUM); | |
2711 | else | |
2712 | return (-EIO); | |
2713 | } | |
2714 | timeout = STp->long_timeout; | |
2715 | STps = &(STp->ps[STp->partition]); | |
2716 | fileno = STps->drv_file; | |
2717 | blkno = STps->drv_block; | |
2718 | at_sm = STps->at_sm; | |
2719 | ||
2720 | memset(cmd, 0, MAX_COMMAND_SIZE); | |
2721 | switch (cmd_in) { | |
2722 | case MTFSFM: | |
2723 | chg_eof = 0; /* Changed from the FSF after this */ | |
2724 | case MTFSF: | |
2725 | cmd[0] = SPACE; | |
2726 | cmd[1] = 0x01; /* Space FileMarks */ | |
2727 | cmd[2] = (arg >> 16); | |
2728 | cmd[3] = (arg >> 8); | |
2729 | cmd[4] = arg; | |
b30d8bca | 2730 | deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd); |
1da177e4 LT |
2731 | if (fileno >= 0) |
2732 | fileno += arg; | |
2733 | blkno = 0; | |
2734 | at_sm &= (arg == 0); | |
2735 | break; | |
2736 | case MTBSFM: | |
2737 | chg_eof = 0; /* Changed from the FSF after this */ | |
2738 | case MTBSF: | |
2739 | cmd[0] = SPACE; | |
2740 | cmd[1] = 0x01; /* Space FileMarks */ | |
2741 | ltmp = (-arg); | |
2742 | cmd[2] = (ltmp >> 16); | |
2743 | cmd[3] = (ltmp >> 8); | |
2744 | cmd[4] = ltmp; | |
b30d8bca | 2745 | deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd); |
1da177e4 LT |
2746 | if (fileno >= 0) |
2747 | fileno -= arg; | |
2748 | blkno = (-1); /* We can't know the block number */ | |
2749 | at_sm &= (arg == 0); | |
2750 | break; | |
2751 | case MTFSR: | |
2752 | cmd[0] = SPACE; | |
2753 | cmd[1] = 0x00; /* Space Blocks */ | |
2754 | cmd[2] = (arg >> 16); | |
2755 | cmd[3] = (arg >> 8); | |
2756 | cmd[4] = arg; | |
b30d8bca | 2757 | deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd); |
1da177e4 LT |
2758 | if (blkno >= 0) |
2759 | blkno += arg; | |
2760 | at_sm &= (arg == 0); | |
2761 | break; | |
2762 | case MTBSR: | |
2763 | cmd[0] = SPACE; | |
2764 | cmd[1] = 0x00; /* Space Blocks */ | |
2765 | ltmp = (-arg); | |
2766 | cmd[2] = (ltmp >> 16); | |
2767 | cmd[3] = (ltmp >> 8); | |
2768 | cmd[4] = ltmp; | |
b30d8bca | 2769 | deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd); |
1da177e4 LT |
2770 | if (blkno >= 0) |
2771 | blkno -= arg; | |
2772 | at_sm &= (arg == 0); | |
2773 | break; | |
2774 | case MTFSS: | |
2775 | cmd[0] = SPACE; | |
2776 | cmd[1] = 0x04; /* Space Setmarks */ | |
2777 | cmd[2] = (arg >> 16); | |
2778 | cmd[3] = (arg >> 8); | |
2779 | cmd[4] = arg; | |
b30d8bca | 2780 | deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd); |
1da177e4 LT |
2781 | if (arg != 0) { |
2782 | blkno = fileno = (-1); | |
2783 | at_sm = 1; | |
2784 | } | |
2785 | break; | |
2786 | case MTBSS: | |
2787 | cmd[0] = SPACE; | |
2788 | cmd[1] = 0x04; /* Space Setmarks */ | |
2789 | ltmp = (-arg); | |
2790 | cmd[2] = (ltmp >> 16); | |
2791 | cmd[3] = (ltmp >> 8); | |
2792 | cmd[4] = ltmp; | |
b30d8bca | 2793 | deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd); |
1da177e4 LT |
2794 | if (arg != 0) { |
2795 | blkno = fileno = (-1); | |
2796 | at_sm = 1; | |
2797 | } | |
2798 | break; | |
2799 | case MTWEOF: | |
3e51d3c9 | 2800 | case MTWEOFI: |
1da177e4 LT |
2801 | case MTWSM: |
2802 | if (STp->write_prot) | |
2803 | return (-EACCES); | |
2804 | cmd[0] = WRITE_FILEMARKS; | |
2805 | if (cmd_in == MTWSM) | |
2806 | cmd[1] = 2; | |
c743e44f LD |
2807 | if (cmd_in == MTWEOFI || |
2808 | (cmd_in == MTWEOF && STp->immediate_filemark)) | |
3e51d3c9 | 2809 | cmd[1] |= 1; |
1da177e4 LT |
2810 | cmd[2] = (arg >> 16); |
2811 | cmd[3] = (arg >> 8); | |
2812 | cmd[4] = arg; | |
a02488ed | 2813 | timeout = STp->device->request_queue->rq_timeout; |
b30d8bca HR |
2814 | DEBC( |
2815 | if (cmd_in != MTWSM) | |
2816 | st_printk(ST_DEB_MSG, STp, | |
2817 | "Writing %d filemarks.\n", | |
2818 | cmd[2] * 65536 + | |
2819 | cmd[3] * 256 + | |
2820 | cmd[4]); | |
2821 | else | |
2822 | st_printk(ST_DEB_MSG, STp, | |
2823 | "Writing %d setmarks.\n", | |
2824 | cmd[2] * 65536 + | |
2825 | cmd[3] * 256 + | |
2826 | cmd[4]); | |
1da177e4 LT |
2827 | ) |
2828 | if (fileno >= 0) | |
2829 | fileno += arg; | |
2830 | blkno = 0; | |
2831 | at_sm = (cmd_in == MTWSM); | |
2832 | break; | |
2833 | case MTREW: | |
2834 | cmd[0] = REZERO_UNIT; | |
2835 | if (STp->immediate) { | |
2836 | cmd[1] = 1; /* Don't wait for completion */ | |
a02488ed | 2837 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 | 2838 | } |
b30d8bca | 2839 | DEBC_printk(STp, "Rewinding tape.\n"); |
1da177e4 LT |
2840 | fileno = blkno = at_sm = 0; |
2841 | break; | |
2842 | case MTNOP: | |
b30d8bca | 2843 | DEBC_printk(STp, "No op on tape.\n"); |
1da177e4 LT |
2844 | return 0; /* Should do something ? */ |
2845 | break; | |
2846 | case MTRETEN: | |
2847 | cmd[0] = START_STOP; | |
2848 | if (STp->immediate) { | |
2849 | cmd[1] = 1; /* Don't wait for completion */ | |
a02488ed | 2850 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
2851 | } |
2852 | cmd[4] = 3; | |
b30d8bca | 2853 | DEBC_printk(STp, "Retensioning tape.\n"); |
1da177e4 LT |
2854 | fileno = blkno = at_sm = 0; |
2855 | break; | |
2856 | case MTEOM: | |
2857 | if (!STp->fast_mteom) { | |
2858 | /* space to the end of tape */ | |
2859 | ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); | |
2860 | fileno = STps->drv_file; | |
2861 | if (STps->eof >= ST_EOD_1) | |
2862 | return 0; | |
2863 | /* The next lines would hide the number of spaced FileMarks | |
2864 | That's why I inserted the previous lines. I had no luck | |
2865 | with detecting EOM with FSF, so we go now to EOM. | |
2866 | Joerg Weule */ | |
2867 | } else | |
2868 | fileno = (-1); | |
2869 | cmd[0] = SPACE; | |
2870 | cmd[1] = 3; | |
b30d8bca | 2871 | DEBC_printk(STp, "Spacing to end of recorded medium.\n"); |
1da177e4 LT |
2872 | blkno = -1; |
2873 | at_sm = 0; | |
2874 | break; | |
2875 | case MTERASE: | |
2876 | if (STp->write_prot) | |
2877 | return (-EACCES); | |
2878 | cmd[0] = ERASE; | |
2879 | cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ | |
2880 | if (STp->immediate) { | |
2881 | cmd[1] |= 2; /* Don't wait for completion */ | |
a02488ed | 2882 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
2883 | } |
2884 | else | |
2885 | timeout = STp->long_timeout * 8; | |
2886 | ||
b30d8bca | 2887 | DEBC_printk(STp, "Erasing tape.\n"); |
1da177e4 LT |
2888 | fileno = blkno = at_sm = 0; |
2889 | break; | |
2890 | case MTSETBLK: /* Set block length */ | |
2891 | case MTSETDENSITY: /* Set tape density */ | |
2892 | case MTSETDRVBUFFER: /* Set drive buffering */ | |
2893 | case SET_DENS_AND_BLK: /* Set density and block size */ | |
2894 | chg_eof = 0; | |
2895 | if (STp->dirty || (STp->buffer)->buffer_bytes != 0) | |
2896 | return (-EIO); /* Not allowed if data in buffer */ | |
2897 | if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && | |
2898 | (arg & MT_ST_BLKSIZE_MASK) != 0 && | |
2899 | STp->max_block > 0 && | |
2900 | ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || | |
2901 | (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { | |
b30d8bca | 2902 | st_printk(KERN_WARNING, STp, "Illegal block size.\n"); |
1da177e4 LT |
2903 | return (-EINVAL); |
2904 | } | |
2905 | cmd[0] = MODE_SELECT; | |
2906 | if ((STp->use_pf & USE_PF)) | |
2907 | cmd[1] = MODE_SELECT_PAGE_FORMAT; | |
2908 | cmd[4] = datalen = 12; | |
2909 | direction = DMA_TO_DEVICE; | |
2910 | ||
2911 | memset((STp->buffer)->b_data, 0, 12); | |
2912 | if (cmd_in == MTSETDRVBUFFER) | |
2913 | (STp->buffer)->b_data[2] = (arg & 7) << 4; | |
2914 | else | |
2915 | (STp->buffer)->b_data[2] = | |
2916 | STp->drv_buffer << 4; | |
2917 | (STp->buffer)->b_data[3] = 8; /* block descriptor length */ | |
2918 | if (cmd_in == MTSETDENSITY) { | |
2919 | (STp->buffer)->b_data[4] = arg; | |
2920 | STp->density_changed = 1; /* At least we tried ;-) */ | |
2921 | } else if (cmd_in == SET_DENS_AND_BLK) | |
2922 | (STp->buffer)->b_data[4] = arg >> 24; | |
2923 | else | |
2924 | (STp->buffer)->b_data[4] = STp->density; | |
2925 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { | |
2926 | ltmp = arg & MT_ST_BLKSIZE_MASK; | |
2927 | if (cmd_in == MTSETBLK) | |
2928 | STp->blksize_changed = 1; /* At least we tried ;-) */ | |
2929 | } else | |
2930 | ltmp = STp->block_size; | |
2931 | (STp->buffer)->b_data[9] = (ltmp >> 16); | |
2932 | (STp->buffer)->b_data[10] = (ltmp >> 8); | |
2933 | (STp->buffer)->b_data[11] = ltmp; | |
a02488ed | 2934 | timeout = STp->device->request_queue->rq_timeout; |
b30d8bca | 2935 | DEBC( |
1da177e4 | 2936 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) |
b30d8bca HR |
2937 | st_printk(ST_DEB_MSG, STp, |
2938 | "Setting block size to %d bytes.\n", | |
2939 | (STp->buffer)->b_data[9] * 65536 + | |
2940 | (STp->buffer)->b_data[10] * 256 + | |
2941 | (STp->buffer)->b_data[11]); | |
1da177e4 | 2942 | if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) |
b30d8bca HR |
2943 | st_printk(ST_DEB_MSG, STp, |
2944 | "Setting density code to %x.\n", | |
2945 | (STp->buffer)->b_data[4]); | |
1da177e4 | 2946 | if (cmd_in == MTSETDRVBUFFER) |
b30d8bca HR |
2947 | st_printk(ST_DEB_MSG, STp, |
2948 | "Setting drive buffer code to %d.\n", | |
2949 | ((STp->buffer)->b_data[2] >> 4) & 7); | |
1da177e4 LT |
2950 | ) |
2951 | break; | |
2952 | default: | |
2953 | return (-ENOSYS); | |
2954 | } | |
2955 | ||
02ae2c0e KM |
2956 | SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, |
2957 | timeout, MAX_RETRIES, 1); | |
1da177e4 LT |
2958 | if (!SRpnt) |
2959 | return (STp->buffer)->syscall_result; | |
2960 | ||
02ae2c0e | 2961 | ioctl_result = (STp->buffer)->syscall_result; |
1da177e4 LT |
2962 | |
2963 | if (!ioctl_result) { /* SCSI command successful */ | |
8b05b773 | 2964 | st_release_request(SRpnt); |
1da177e4 LT |
2965 | SRpnt = NULL; |
2966 | STps->drv_block = blkno; | |
2967 | STps->drv_file = fileno; | |
2968 | STps->at_sm = at_sm; | |
2969 | ||
2970 | if (cmd_in == MTBSFM) | |
2971 | ioctl_result = st_int_ioctl(STp, MTFSF, 1); | |
2972 | else if (cmd_in == MTFSFM) | |
2973 | ioctl_result = st_int_ioctl(STp, MTBSF, 1); | |
2974 | ||
2975 | if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { | |
1da177e4 LT |
2976 | STp->block_size = arg & MT_ST_BLKSIZE_MASK; |
2977 | if (STp->block_size != 0) { | |
1da177e4 LT |
2978 | (STp->buffer)->buffer_blocks = |
2979 | (STp->buffer)->buffer_size / STp->block_size; | |
2980 | } | |
2981 | (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; | |
2982 | if (cmd_in == SET_DENS_AND_BLK) | |
2983 | STp->density = arg >> MT_ST_DENSITY_SHIFT; | |
2984 | } else if (cmd_in == MTSETDRVBUFFER) | |
2985 | STp->drv_buffer = (arg & 7); | |
2986 | else if (cmd_in == MTSETDENSITY) | |
2987 | STp->density = arg; | |
2988 | ||
2989 | if (cmd_in == MTEOM) | |
2990 | STps->eof = ST_EOD; | |
2991 | else if (cmd_in == MTFSF) | |
2992 | STps->eof = ST_FM; | |
2993 | else if (chg_eof) | |
2994 | STps->eof = ST_NOEOF; | |
2995 | ||
3e51d3c9 KM |
2996 | if (cmd_in == MTWEOF || cmd_in == MTWEOFI) |
2997 | STps->rw = ST_IDLE; /* prevent automatic WEOF at close */ | |
1da177e4 LT |
2998 | } else { /* SCSI command was not completely successful. Don't return |
2999 | from this block without releasing the SCSI command block! */ | |
3000 | struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; | |
3001 | ||
3002 | if (cmdstatp->flags & SENSE_EOM) { | |
3003 | if (cmd_in != MTBSF && cmd_in != MTBSFM && | |
3004 | cmd_in != MTBSR && cmd_in != MTBSS) | |
3005 | STps->eof = ST_EOM_OK; | |
3006 | STps->drv_block = 0; | |
3007 | } | |
3008 | ||
3009 | if (cmdstatp->remainder_valid) | |
3010 | undone = (int)cmdstatp->uremainder64; | |
3011 | else | |
3012 | undone = 0; | |
3013 | ||
3e51d3c9 | 3014 | if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) && |
1da177e4 | 3015 | cmdstatp->have_sense && |
91614c05 KM |
3016 | (cmdstatp->flags & SENSE_EOM)) { |
3017 | if (cmdstatp->sense_hdr.sense_key == NO_SENSE || | |
3018 | cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { | |
3019 | ioctl_result = 0; /* EOF(s) written successfully at EOM */ | |
3020 | STps->eof = ST_NOEOF; | |
3021 | } else { /* Writing EOF(s) failed */ | |
3022 | if (fileno >= 0) | |
3023 | fileno -= undone; | |
3024 | if (undone < arg) | |
3025 | STps->eof = ST_NOEOF; | |
3026 | } | |
1da177e4 | 3027 | STps->drv_file = fileno; |
1da177e4 LT |
3028 | } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { |
3029 | if (fileno >= 0) | |
3030 | STps->drv_file = fileno - undone; | |
3031 | else | |
3032 | STps->drv_file = fileno; | |
3033 | STps->drv_block = -1; | |
3034 | STps->eof = ST_NOEOF; | |
3035 | } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { | |
3036 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ | |
3037 | undone = (-undone); | |
3038 | if (STps->drv_file >= 0) | |
3039 | STps->drv_file = fileno + undone; | |
3040 | STps->drv_block = 0; | |
3041 | STps->eof = ST_NOEOF; | |
3042 | } else if (cmd_in == MTFSR) { | |
3043 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ | |
3044 | if (STps->drv_file >= 0) | |
3045 | STps->drv_file++; | |
3046 | STps->drv_block = 0; | |
3047 | STps->eof = ST_FM; | |
3048 | } else { | |
3049 | if (blkno >= undone) | |
3050 | STps->drv_block = blkno - undone; | |
3051 | else | |
3052 | STps->drv_block = (-1); | |
3053 | STps->eof = ST_NOEOF; | |
3054 | } | |
3055 | } else if (cmd_in == MTBSR) { | |
3056 | if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ | |
3057 | STps->drv_file--; | |
3058 | STps->drv_block = (-1); | |
3059 | } else { | |
3060 | if (arg > 0 && undone < 0) /* Some drives get this wrong */ | |
3061 | undone = (-undone); | |
3062 | if (STps->drv_block >= 0) | |
3063 | STps->drv_block = blkno + undone; | |
3064 | } | |
3065 | STps->eof = ST_NOEOF; | |
3066 | } else if (cmd_in == MTEOM) { | |
3067 | STps->drv_file = (-1); | |
3068 | STps->drv_block = (-1); | |
3069 | STps->eof = ST_EOD; | |
3070 | } else if (cmd_in == MTSETBLK || | |
3071 | cmd_in == MTSETDENSITY || | |
3072 | cmd_in == MTSETDRVBUFFER || | |
3073 | cmd_in == SET_DENS_AND_BLK) { | |
3074 | if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && | |
3075 | !(STp->use_pf & PF_TESTED)) { | |
3076 | /* Try the other possible state of Page Format if not | |
3077 | already tried */ | |
1da2019f | 3078 | STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED; |
8b05b773 | 3079 | st_release_request(SRpnt); |
1da177e4 LT |
3080 | SRpnt = NULL; |
3081 | return st_int_ioctl(STp, cmd_in, arg); | |
3082 | } | |
3083 | } else if (chg_eof) | |
3084 | STps->eof = ST_NOEOF; | |
3085 | ||
3086 | if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) | |
3087 | STps->eof = ST_EOD; | |
3088 | ||
8b05b773 | 3089 | st_release_request(SRpnt); |
1da177e4 LT |
3090 | SRpnt = NULL; |
3091 | } | |
3092 | ||
3093 | return ioctl_result; | |
3094 | } | |
3095 | \f | |
3096 | ||
3097 | /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc | |
3098 | structure. */ | |
3099 | ||
3100 | static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, | |
3101 | int logical) | |
3102 | { | |
3103 | int result; | |
3104 | unsigned char scmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 3105 | struct st_request *SRpnt; |
1da177e4 LT |
3106 | |
3107 | if (STp->ready != ST_READY) | |
3108 | return (-EIO); | |
3109 | ||
3110 | memset(scmd, 0, MAX_COMMAND_SIZE); | |
3111 | if ((STp->device)->scsi_level < SCSI_2) { | |
3112 | scmd[0] = QFA_REQUEST_BLOCK; | |
3113 | scmd[4] = 3; | |
3114 | } else { | |
3115 | scmd[0] = READ_POSITION; | |
3116 | if (!logical && !STp->scsi2_logical) | |
3117 | scmd[1] = 1; | |
3118 | } | |
02ae2c0e KM |
3119 | SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, |
3120 | STp->device->request_queue->rq_timeout, | |
3121 | MAX_READY_RETRIES, 1); | |
1da177e4 | 3122 | if (!SRpnt) |
02ae2c0e | 3123 | return (STp->buffer)->syscall_result; |
1da177e4 LT |
3124 | |
3125 | if ((STp->buffer)->syscall_result != 0 || | |
3126 | (STp->device->scsi_level >= SCSI_2 && | |
3127 | ((STp->buffer)->b_data[0] & 4) != 0)) { | |
3128 | *block = *partition = 0; | |
b30d8bca | 3129 | DEBC_printk(STp, " Can't read tape position.\n"); |
1da177e4 LT |
3130 | result = (-EIO); |
3131 | } else { | |
3132 | result = 0; | |
3133 | if ((STp->device)->scsi_level < SCSI_2) { | |
3134 | *block = ((STp->buffer)->b_data[0] << 16) | |
3135 | + ((STp->buffer)->b_data[1] << 8) | |
3136 | + (STp->buffer)->b_data[2]; | |
3137 | *partition = 0; | |
3138 | } else { | |
3139 | *block = ((STp->buffer)->b_data[4] << 24) | |
3140 | + ((STp->buffer)->b_data[5] << 16) | |
3141 | + ((STp->buffer)->b_data[6] << 8) | |
3142 | + (STp->buffer)->b_data[7]; | |
3143 | *partition = (STp->buffer)->b_data[1]; | |
3144 | if (((STp->buffer)->b_data[0] & 0x80) && | |
3145 | (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ | |
3146 | STp->ps[0].drv_block = STp->ps[0].drv_file = 0; | |
3147 | } | |
b30d8bca HR |
3148 | DEBC_printk(STp, "Got tape pos. blk %d part %d.\n", |
3149 | *block, *partition); | |
1da177e4 | 3150 | } |
8b05b773 | 3151 | st_release_request(SRpnt); |
1da177e4 LT |
3152 | SRpnt = NULL; |
3153 | ||
3154 | return result; | |
3155 | } | |
3156 | ||
3157 | ||
3158 | /* Set the tape block and partition. Negative partition means that only the | |
3159 | block should be set in vendor specific way. */ | |
3160 | static int set_location(struct scsi_tape *STp, unsigned int block, int partition, | |
3161 | int logical) | |
3162 | { | |
3163 | struct st_partstat *STps; | |
3164 | int result, p; | |
3165 | unsigned int blk; | |
3166 | int timeout; | |
3167 | unsigned char scmd[MAX_COMMAND_SIZE]; | |
8b05b773 | 3168 | struct st_request *SRpnt; |
1da177e4 LT |
3169 | |
3170 | if (STp->ready != ST_READY) | |
3171 | return (-EIO); | |
3172 | timeout = STp->long_timeout; | |
3173 | STps = &(STp->ps[STp->partition]); | |
3174 | ||
b30d8bca HR |
3175 | DEBC_printk(STp, "Setting block to %d and partition to %d.\n", |
3176 | block, partition); | |
1da177e4 LT |
3177 | DEB(if (partition < 0) |
3178 | return (-EIO); ) | |
3179 | ||
3180 | /* Update the location at the partition we are leaving */ | |
3181 | if ((!STp->can_partitions && partition != 0) || | |
3182 | partition >= ST_NBR_PARTITIONS) | |
3183 | return (-EINVAL); | |
3184 | if (partition != STp->partition) { | |
3185 | if (get_location(STp, &blk, &p, 1)) | |
3186 | STps->last_block_valid = 0; | |
3187 | else { | |
3188 | STps->last_block_valid = 1; | |
3189 | STps->last_block_visited = blk; | |
b30d8bca HR |
3190 | DEBC_printk(STp, "Visited block %d for " |
3191 | "partition %d saved.\n", | |
3192 | blk, STp->partition); | |
1da177e4 LT |
3193 | } |
3194 | } | |
3195 | ||
3196 | memset(scmd, 0, MAX_COMMAND_SIZE); | |
3197 | if ((STp->device)->scsi_level < SCSI_2) { | |
3198 | scmd[0] = QFA_SEEK_BLOCK; | |
3199 | scmd[2] = (block >> 16); | |
3200 | scmd[3] = (block >> 8); | |
3201 | scmd[4] = block; | |
3202 | scmd[5] = 0; | |
3203 | } else { | |
3204 | scmd[0] = SEEK_10; | |
3205 | scmd[3] = (block >> 24); | |
3206 | scmd[4] = (block >> 16); | |
3207 | scmd[5] = (block >> 8); | |
3208 | scmd[6] = block; | |
3209 | if (!logical && !STp->scsi2_logical) | |
3210 | scmd[1] = 4; | |
3211 | if (STp->partition != partition) { | |
3212 | scmd[1] |= 2; | |
3213 | scmd[8] = partition; | |
b30d8bca HR |
3214 | DEBC_printk(STp, "Trying to change partition " |
3215 | "from %d to %d\n", STp->partition, | |
3216 | partition); | |
1da177e4 LT |
3217 | } |
3218 | } | |
3219 | if (STp->immediate) { | |
3220 | scmd[1] |= 1; /* Don't wait for completion */ | |
a02488ed | 3221 | timeout = STp->device->request_queue->rq_timeout; |
1da177e4 LT |
3222 | } |
3223 | ||
02ae2c0e KM |
3224 | SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, |
3225 | timeout, MAX_READY_RETRIES, 1); | |
1da177e4 | 3226 | if (!SRpnt) |
02ae2c0e | 3227 | return (STp->buffer)->syscall_result; |
1da177e4 LT |
3228 | |
3229 | STps->drv_block = STps->drv_file = (-1); | |
3230 | STps->eof = ST_NOEOF; | |
3231 | if ((STp->buffer)->syscall_result != 0) { | |
3232 | result = (-EIO); | |
3233 | if (STp->can_partitions && | |
3234 | (STp->device)->scsi_level >= SCSI_2 && | |
3235 | (p = find_partition(STp)) >= 0) | |
3236 | STp->partition = p; | |
3237 | } else { | |
3238 | if (STp->can_partitions) { | |
3239 | STp->partition = partition; | |
3240 | STps = &(STp->ps[partition]); | |
3241 | if (!STps->last_block_valid || | |
3242 | STps->last_block_visited != block) { | |
3243 | STps->at_sm = 0; | |
3244 | STps->rw = ST_IDLE; | |
3245 | } | |
3246 | } else | |
3247 | STps->at_sm = 0; | |
3248 | if (block == 0) | |
3249 | STps->drv_block = STps->drv_file = 0; | |
3250 | result = 0; | |
3251 | } | |
02ae2c0e | 3252 | |
8b05b773 | 3253 | st_release_request(SRpnt); |
1da177e4 LT |
3254 | SRpnt = NULL; |
3255 | ||
3256 | return result; | |
3257 | } | |
3258 | ||
3259 | ||
3260 | /* Find the current partition number for the drive status. Called from open and | |
3261 | returns either partition number of negative error code. */ | |
3262 | static int find_partition(struct scsi_tape *STp) | |
3263 | { | |
3264 | int i, partition; | |
3265 | unsigned int block; | |
3266 | ||
3267 | if ((i = get_location(STp, &block, &partition, 1)) < 0) | |
3268 | return i; | |
3269 | if (partition >= ST_NBR_PARTITIONS) | |
3270 | return (-EIO); | |
3271 | return partition; | |
3272 | } | |
3273 | ||
3274 | ||
3275 | /* Change the partition if necessary */ | |
3276 | static int switch_partition(struct scsi_tape *STp) | |
3277 | { | |
3278 | struct st_partstat *STps; | |
3279 | ||
3280 | if (STp->partition == STp->new_partition) | |
3281 | return 0; | |
3282 | STps = &(STp->ps[STp->new_partition]); | |
3283 | if (!STps->last_block_valid) | |
3284 | STps->last_block_visited = 0; | |
3285 | return set_location(STp, STps->last_block_visited, STp->new_partition, 1); | |
3286 | } | |
3287 | \f | |
3288 | /* Functions for reading and writing the medium partition mode page. */ | |
3289 | ||
3290 | #define PART_PAGE 0x11 | |
3291 | #define PART_PAGE_FIXED_LENGTH 8 | |
3292 | ||
3293 | #define PP_OFF_MAX_ADD_PARTS 2 | |
3294 | #define PP_OFF_NBR_ADD_PARTS 3 | |
3295 | #define PP_OFF_FLAGS 4 | |
3296 | #define PP_OFF_PART_UNITS 6 | |
3297 | #define PP_OFF_RESERVED 7 | |
3298 | ||
3299 | #define PP_BIT_IDP 0x20 | |
3300 | #define PP_MSK_PSUM_MB 0x10 | |
3301 | ||
3302 | /* Get the number of partitions on the tape. As a side effect reads the | |
3303 | mode page into the tape buffer. */ | |
3304 | static int nbr_partitions(struct scsi_tape *STp) | |
3305 | { | |
3306 | int result; | |
1da177e4 LT |
3307 | |
3308 | if (STp->ready != ST_READY) | |
3309 | return (-EIO); | |
3310 | ||
3311 | result = read_mode_page(STp, PART_PAGE, 1); | |
3312 | ||
3313 | if (result) { | |
b30d8bca | 3314 | DEBC_printk(STp, "Can't read medium partition page.\n"); |
1da177e4 LT |
3315 | result = (-EIO); |
3316 | } else { | |
3317 | result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + | |
3318 | PP_OFF_NBR_ADD_PARTS] + 1; | |
b30d8bca | 3319 | DEBC_printk(STp, "Number of partitions %d.\n", result); |
1da177e4 LT |
3320 | } |
3321 | ||
3322 | return result; | |
3323 | } | |
3324 | ||
3325 | ||
3326 | /* Partition the tape into two partitions if size > 0 or one partition if | |
3327 | size == 0. | |
3328 | ||
3329 | The block descriptors are read and written because Sony SDT-7000 does not | |
3330 | work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). | |
3331 | ||
3332 | My HP C1533A drive returns only one partition size field. This is used to | |
3333 | set the size of partition 1. There is no size field for the default partition. | |
3334 | Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is | |
3335 | used to set the size of partition 1 (this is what the SCSI-3 standard specifies). | |
3336 | The following algorithm is used to accommodate both drives: if the number of | |
3337 | partition size fields is greater than the maximum number of additional partitions | |
3338 | in the mode page, the second field is used. Otherwise the first field is used. | |
3339 | ||
3340 | For Seagate DDS drives the page length must be 8 when no partitions is defined | |
3341 | and 10 when 1 partition is defined (information from Eric Lee Green). This is | |
3342 | is acceptable also to some other old drives and enforced if the first partition | |
3343 | size field is used for the first additional partition size. | |
3344 | */ | |
3345 | static int partition_tape(struct scsi_tape *STp, int size) | |
3346 | { | |
1da177e4 LT |
3347 | int result; |
3348 | int pgo, psd_cnt, psdo; | |
3349 | unsigned char *bp; | |
3350 | ||
3351 | result = read_mode_page(STp, PART_PAGE, 0); | |
3352 | if (result) { | |
b30d8bca | 3353 | DEBC_printk(STp, "Can't read partition mode page.\n"); |
1da177e4 LT |
3354 | return result; |
3355 | } | |
3356 | /* The mode page is in the buffer. Let's modify it and write it. */ | |
3357 | bp = (STp->buffer)->b_data; | |
3358 | pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; | |
b30d8bca HR |
3359 | DEBC_printk(STp, "Partition page length is %d bytes.\n", |
3360 | bp[pgo + MP_OFF_PAGE_LENGTH] + 2); | |
1da177e4 LT |
3361 | |
3362 | psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; | |
3363 | psdo = pgo + PART_PAGE_FIXED_LENGTH; | |
3364 | if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) { | |
3365 | bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */ | |
3366 | psdo += 2; | |
3367 | } | |
3368 | memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); | |
3369 | ||
b30d8bca | 3370 | DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n", |
1da177e4 | 3371 | psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], |
b30d8bca | 3372 | bp[pgo + PP_OFF_NBR_ADD_PARTS]); |
1da177e4 LT |
3373 | |
3374 | if (size <= 0) { | |
3375 | bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; | |
3376 | if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) | |
3377 | bp[pgo + MP_OFF_PAGE_LENGTH] = 6; | |
b30d8bca | 3378 | DEBC_printk(STp, "Formatting tape with one partition.\n"); |
1da177e4 LT |
3379 | } else { |
3380 | bp[psdo] = (size >> 8) & 0xff; | |
3381 | bp[psdo + 1] = size & 0xff; | |
3382 | bp[pgo + 3] = 1; | |
3383 | if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) | |
3384 | bp[pgo + MP_OFF_PAGE_LENGTH] = 8; | |
b30d8bca HR |
3385 | DEBC_printk(STp, "Formatting tape with two partitions " |
3386 | "(1 = %d MB).\n", size); | |
1da177e4 LT |
3387 | } |
3388 | bp[pgo + PP_OFF_PART_UNITS] = 0; | |
3389 | bp[pgo + PP_OFF_RESERVED] = 0; | |
3390 | bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB; | |
3391 | ||
3392 | result = write_mode_page(STp, PART_PAGE, 1); | |
3393 | if (result) { | |
b30d8bca | 3394 | st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n"); |
1da177e4 LT |
3395 | result = (-EIO); |
3396 | } | |
3397 | ||
3398 | return result; | |
3399 | } | |
3400 | \f | |
3401 | ||
3402 | ||
3403 | /* The ioctl command */ | |
fd66c1b4 | 3404 | static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) |
1da177e4 LT |
3405 | { |
3406 | int i, cmd_nr, cmd_type, bt; | |
3407 | int retval = 0; | |
3408 | unsigned int blk; | |
3409 | struct scsi_tape *STp = file->private_data; | |
3410 | struct st_modedef *STm; | |
3411 | struct st_partstat *STps; | |
1da177e4 LT |
3412 | void __user *p = (void __user *)arg; |
3413 | ||
28f85009 | 3414 | if (mutex_lock_interruptible(&STp->lock)) |
1da177e4 LT |
3415 | return -ERESTARTSYS; |
3416 | ||
b30d8bca | 3417 | DEB( |
1da177e4 | 3418 | if (debugging && !STp->in_use) { |
b30d8bca | 3419 | st_printk(ST_DEB_MSG, STp, "Incorrect device.\n"); |
1da177e4 LT |
3420 | retval = (-EIO); |
3421 | goto out; | |
3422 | } ) /* end DEB */ | |
3423 | ||
3424 | STm = &(STp->modes[STp->current_mode]); | |
3425 | STps = &(STp->ps[STp->partition]); | |
3426 | ||
3427 | /* | |
3428 | * If we are in the middle of error recovery, don't let anyone | |
3429 | * else try and use this device. Also, if error recovery fails, it | |
3430 | * may try and take the device offline, in which case all further | |
3431 | * access to the device is prohibited. | |
3432 | */ | |
906d15fb CH |
3433 | retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in, |
3434 | file->f_flags & O_NDELAY); | |
3435 | if (retval) | |
1da177e4 | 3436 | goto out; |
1da177e4 LT |
3437 | |
3438 | cmd_type = _IOC_TYPE(cmd_in); | |
3439 | cmd_nr = _IOC_NR(cmd_in); | |
3440 | ||
3441 | if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { | |
3442 | struct mtop mtc; | |
3443 | ||
3444 | if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { | |
3445 | retval = (-EINVAL); | |
3446 | goto out; | |
3447 | } | |
3448 | ||
3449 | i = copy_from_user(&mtc, p, sizeof(struct mtop)); | |
3450 | if (i) { | |
3451 | retval = (-EFAULT); | |
3452 | goto out; | |
3453 | } | |
3454 | ||
3455 | if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { | |
b30d8bca HR |
3456 | st_printk(KERN_WARNING, STp, |
3457 | "MTSETDRVBUFFER only allowed for root.\n"); | |
1da177e4 LT |
3458 | retval = (-EPERM); |
3459 | goto out; | |
3460 | } | |
3461 | if (!STm->defined && | |
3462 | (mtc.mt_op != MTSETDRVBUFFER && | |
3463 | (mtc.mt_count & MT_ST_OPTIONS) == 0)) { | |
3464 | retval = (-ENXIO); | |
3465 | goto out; | |
3466 | } | |
3467 | ||
3468 | if (!STp->pos_unknown) { | |
3469 | ||
3470 | if (STps->eof == ST_FM_HIT) { | |
3471 | if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || | |
3472 | mtc.mt_op == MTEOM) { | |
3473 | mtc.mt_count -= 1; | |
3474 | if (STps->drv_file >= 0) | |
3475 | STps->drv_file += 1; | |
3476 | } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { | |
3477 | mtc.mt_count += 1; | |
3478 | if (STps->drv_file >= 0) | |
3479 | STps->drv_file += 1; | |
3480 | } | |
3481 | } | |
3482 | ||
3483 | if (mtc.mt_op == MTSEEK) { | |
3484 | /* Old position must be restored if partition will be | |
3485 | changed */ | |
3486 | i = !STp->can_partitions || | |
3487 | (STp->new_partition != STp->partition); | |
3488 | } else { | |
3489 | i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || | |
3490 | mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || | |
3491 | mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || | |
3492 | mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || | |
3493 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || | |
3494 | mtc.mt_op == MTCOMPRESSION; | |
3495 | } | |
3496 | i = flush_buffer(STp, i); | |
3497 | if (i < 0) { | |
3498 | retval = i; | |
3499 | goto out; | |
3500 | } | |
3501 | if (STps->rw == ST_WRITING && | |
3502 | (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || | |
3503 | mtc.mt_op == MTSEEK || | |
3504 | mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { | |
3505 | i = st_int_ioctl(STp, MTWEOF, 1); | |
3506 | if (i < 0) { | |
3507 | retval = i; | |
3508 | goto out; | |
3509 | } | |
3510 | if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) | |
3511 | mtc.mt_count++; | |
3512 | STps->rw = ST_IDLE; | |
3513 | } | |
3514 | ||
3515 | } else { | |
3516 | /* | |
3517 | * If there was a bus reset, block further access | |
3518 | * to this device. If the user wants to rewind the tape, | |
3519 | * then reset the flag and allow access again. | |
3520 | */ | |
3521 | if (mtc.mt_op != MTREW && | |
3522 | mtc.mt_op != MTOFFL && | |
3523 | mtc.mt_op != MTRETEN && | |
3524 | mtc.mt_op != MTERASE && | |
3525 | mtc.mt_op != MTSEEK && | |
3526 | mtc.mt_op != MTEOM) { | |
3527 | retval = (-EIO); | |
3528 | goto out; | |
3529 | } | |
3530 | reset_state(STp); | |
3531 | /* remove this when the midlevel properly clears was_reset */ | |
3532 | STp->device->was_reset = 0; | |
3533 | } | |
3534 | ||
3535 | if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && | |
3536 | mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && | |
3537 | mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) | |
3538 | STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ | |
3539 | ||
3540 | if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) | |
3541 | do_door_lock(STp, 0); /* Ignore result! */ | |
3542 | ||
3543 | if (mtc.mt_op == MTSETDRVBUFFER && | |
3544 | (mtc.mt_count & MT_ST_OPTIONS) != 0) { | |
3545 | retval = st_set_options(STp, mtc.mt_count); | |
3546 | goto out; | |
3547 | } | |
3548 | ||
3549 | if (mtc.mt_op == MTSETPART) { | |
3550 | if (!STp->can_partitions || | |
3551 | mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { | |
3552 | retval = (-EINVAL); | |
3553 | goto out; | |
3554 | } | |
3555 | if (mtc.mt_count >= STp->nbr_partitions && | |
3556 | (STp->nbr_partitions = nbr_partitions(STp)) < 0) { | |
3557 | retval = (-EIO); | |
3558 | goto out; | |
3559 | } | |
3560 | if (mtc.mt_count >= STp->nbr_partitions) { | |
3561 | retval = (-EINVAL); | |
3562 | goto out; | |
3563 | } | |
3564 | STp->new_partition = mtc.mt_count; | |
3565 | retval = 0; | |
3566 | goto out; | |
3567 | } | |
3568 | ||
3569 | if (mtc.mt_op == MTMKPART) { | |
3570 | if (!STp->can_partitions) { | |
3571 | retval = (-EINVAL); | |
3572 | goto out; | |
3573 | } | |
3574 | if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 || | |
3575 | (i = partition_tape(STp, mtc.mt_count)) < 0) { | |
3576 | retval = i; | |
3577 | goto out; | |
3578 | } | |
3579 | for (i = 0; i < ST_NBR_PARTITIONS; i++) { | |
3580 | STp->ps[i].rw = ST_IDLE; | |
3581 | STp->ps[i].at_sm = 0; | |
3582 | STp->ps[i].last_block_valid = 0; | |
3583 | } | |
3584 | STp->partition = STp->new_partition = 0; | |
3585 | STp->nbr_partitions = 1; /* Bad guess ?-) */ | |
3586 | STps->drv_block = STps->drv_file = 0; | |
3587 | retval = 0; | |
3588 | goto out; | |
3589 | } | |
3590 | ||
3591 | if (mtc.mt_op == MTSEEK) { | |
3592 | i = set_location(STp, mtc.mt_count, STp->new_partition, 0); | |
3593 | if (!STp->can_partitions) | |
3594 | STp->ps[0].rw = ST_IDLE; | |
3595 | retval = i; | |
3596 | goto out; | |
3597 | } | |
3598 | ||
3599 | if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { | |
3600 | retval = do_load_unload(STp, file, 0); | |
3601 | goto out; | |
3602 | } | |
3603 | ||
3604 | if (mtc.mt_op == MTLOAD) { | |
3605 | retval = do_load_unload(STp, file, max(1, mtc.mt_count)); | |
3606 | goto out; | |
3607 | } | |
3608 | ||
3609 | if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { | |
3610 | retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); | |
3611 | goto out; | |
3612 | } | |
3613 | ||
3614 | if (STp->can_partitions && STp->ready == ST_READY && | |
3615 | (i = switch_partition(STp)) < 0) { | |
3616 | retval = i; | |
3617 | goto out; | |
3618 | } | |
3619 | ||
3620 | if (mtc.mt_op == MTCOMPRESSION) | |
3621 | retval = st_compression(STp, (mtc.mt_count & 1)); | |
3622 | else | |
3623 | retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); | |
3624 | goto out; | |
3625 | } | |
3626 | if (!STm->defined) { | |
3627 | retval = (-ENXIO); | |
3628 | goto out; | |
3629 | } | |
3630 | ||
3631 | if ((i = flush_buffer(STp, 0)) < 0) { | |
3632 | retval = i; | |
3633 | goto out; | |
3634 | } | |
3635 | if (STp->can_partitions && | |
3636 | (i = switch_partition(STp)) < 0) { | |
3637 | retval = i; | |
3638 | goto out; | |
3639 | } | |
3640 | ||
3641 | if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { | |
3642 | struct mtget mt_status; | |
3643 | ||
3644 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { | |
3645 | retval = (-EINVAL); | |
3646 | goto out; | |
3647 | } | |
3648 | ||
3649 | mt_status.mt_type = STp->tape_type; | |
3650 | mt_status.mt_dsreg = | |
3651 | ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | | |
3652 | ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); | |
3653 | mt_status.mt_blkno = STps->drv_block; | |
3654 | mt_status.mt_fileno = STps->drv_file; | |
3655 | if (STp->block_size != 0) { | |
3656 | if (STps->rw == ST_WRITING) | |
3657 | mt_status.mt_blkno += | |
3658 | (STp->buffer)->buffer_bytes / STp->block_size; | |
3659 | else if (STps->rw == ST_READING) | |
3660 | mt_status.mt_blkno -= | |
3661 | ((STp->buffer)->buffer_bytes + | |
3662 | STp->block_size - 1) / STp->block_size; | |
3663 | } | |
3664 | ||
3665 | mt_status.mt_gstat = 0; | |
3666 | if (STp->drv_write_prot) | |
3667 | mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
3668 | if (mt_status.mt_blkno == 0) { | |
3669 | if (mt_status.mt_fileno == 0) | |
3670 | mt_status.mt_gstat |= GMT_BOT(0xffffffff); | |
3671 | else | |
3672 | mt_status.mt_gstat |= GMT_EOF(0xffffffff); | |
3673 | } | |
3674 | mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); | |
3675 | mt_status.mt_resid = STp->partition; | |
3676 | if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) | |
3677 | mt_status.mt_gstat |= GMT_EOT(0xffffffff); | |
3678 | else if (STps->eof >= ST_EOM_OK) | |
3679 | mt_status.mt_gstat |= GMT_EOD(0xffffffff); | |
3680 | if (STp->density == 1) | |
3681 | mt_status.mt_gstat |= GMT_D_800(0xffffffff); | |
3682 | else if (STp->density == 2) | |
3683 | mt_status.mt_gstat |= GMT_D_1600(0xffffffff); | |
3684 | else if (STp->density == 3) | |
3685 | mt_status.mt_gstat |= GMT_D_6250(0xffffffff); | |
3686 | if (STp->ready == ST_READY) | |
3687 | mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); | |
3688 | if (STp->ready == ST_NO_TAPE) | |
3689 | mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); | |
3690 | if (STps->at_sm) | |
3691 | mt_status.mt_gstat |= GMT_SM(0xffffffff); | |
3692 | if (STm->do_async_writes || | |
3693 | (STm->do_buffer_writes && STp->block_size != 0) || | |
3694 | STp->drv_buffer != 0) | |
3695 | mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); | |
3696 | if (STp->cleaning_req) | |
3697 | mt_status.mt_gstat |= GMT_CLN(0xffffffff); | |
3698 | ||
3699 | i = copy_to_user(p, &mt_status, sizeof(struct mtget)); | |
3700 | if (i) { | |
3701 | retval = (-EFAULT); | |
3702 | goto out; | |
3703 | } | |
3704 | ||
3705 | STp->recover_reg = 0; /* Clear after read */ | |
3706 | retval = 0; | |
3707 | goto out; | |
3708 | } /* End of MTIOCGET */ | |
3709 | if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { | |
3710 | struct mtpos mt_pos; | |
3711 | if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { | |
3712 | retval = (-EINVAL); | |
3713 | goto out; | |
3714 | } | |
3715 | if ((i = get_location(STp, &blk, &bt, 0)) < 0) { | |
3716 | retval = i; | |
3717 | goto out; | |
3718 | } | |
3719 | mt_pos.mt_blkno = blk; | |
3720 | i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); | |
3721 | if (i) | |
3722 | retval = (-EFAULT); | |
3723 | goto out; | |
3724 | } | |
28f85009 | 3725 | mutex_unlock(&STp->lock); |
1da177e4 LT |
3726 | switch (cmd_in) { |
3727 | case SCSI_IOCTL_GET_IDLUN: | |
3728 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
3729 | break; | |
3730 | default: | |
16c4b3e2 KM |
3731 | if ((cmd_in == SG_IO || |
3732 | cmd_in == SCSI_IOCTL_SEND_COMMAND || | |
3733 | cmd_in == CDROM_SEND_PACKET) && | |
3734 | !capable(CAP_SYS_RAWIO)) | |
1da177e4 LT |
3735 | i = -EPERM; |
3736 | else | |
74f3c8af AV |
3737 | i = scsi_cmd_ioctl(STp->disk->queue, STp->disk, |
3738 | file->f_mode, cmd_in, p); | |
1da177e4 LT |
3739 | if (i != -ENOTTY) |
3740 | return i; | |
3741 | break; | |
3742 | } | |
16c4b3e2 KM |
3743 | retval = scsi_ioctl(STp->device, cmd_in, p); |
3744 | if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */ | |
3745 | STp->rew_at_close = 0; | |
3746 | STp->ready = ST_NO_TAPE; | |
3747 | } | |
3748 | return retval; | |
1da177e4 LT |
3749 | |
3750 | out: | |
28f85009 | 3751 | mutex_unlock(&STp->lock); |
1da177e4 LT |
3752 | return retval; |
3753 | } | |
3754 | ||
3755 | #ifdef CONFIG_COMPAT | |
3756 | static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
3757 | { | |
3758 | struct scsi_tape *STp = file->private_data; | |
3759 | struct scsi_device *sdev = STp->device; | |
3760 | int ret = -ENOIOCTLCMD; | |
3761 | if (sdev->host->hostt->compat_ioctl) { | |
3762 | ||
3763 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); | |
3764 | ||
3765 | } | |
3766 | return ret; | |
3767 | } | |
3768 | #endif | |
3769 | ||
3770 | \f | |
3771 | ||
3772 | /* Try to allocate a new tape buffer. Calling function must not hold | |
3773 | dev_arr_lock. */ | |
f409d6cc | 3774 | static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) |
1da177e4 | 3775 | { |
1da177e4 LT |
3776 | struct st_buffer *tb; |
3777 | ||
f409d6cc | 3778 | tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC); |
1da177e4 LT |
3779 | if (!tb) { |
3780 | printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); | |
3781 | return NULL; | |
3782 | } | |
1ac63cf5 | 3783 | tb->frp_segs = 0; |
1da177e4 | 3784 | tb->use_sg = max_sg; |
1da177e4 | 3785 | tb->dma = need_dma; |
f409d6cc | 3786 | tb->buffer_size = 0; |
1da177e4 | 3787 | |
f409d6cc FT |
3788 | tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *), |
3789 | GFP_ATOMIC); | |
d0e1ae31 FT |
3790 | if (!tb->reserved_pages) { |
3791 | kfree(tb); | |
3792 | return NULL; | |
3793 | } | |
3794 | ||
1da177e4 LT |
3795 | return tb; |
3796 | } | |
3797 | ||
3798 | ||
3799 | /* Try to allocate enough space in the tape buffer */ | |
8f78fc5e KM |
3800 | #define ST_MAX_ORDER 6 |
3801 | ||
1da177e4 LT |
3802 | static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) |
3803 | { | |
769989a4 | 3804 | int segs, max_segs, b_size, order, got; |
c53033f6 | 3805 | gfp_t priority; |
1da177e4 LT |
3806 | |
3807 | if (new_size <= STbuffer->buffer_size) | |
3808 | return 1; | |
3809 | ||
3810 | if (STbuffer->buffer_size <= PAGE_SIZE) | |
3811 | normalize_buffer(STbuffer); /* Avoid extra segment */ | |
3812 | ||
3813 | max_segs = STbuffer->use_sg; | |
1da177e4 LT |
3814 | |
3815 | priority = GFP_KERNEL | __GFP_NOWARN; | |
3816 | if (need_dma) | |
3817 | priority |= GFP_DMA; | |
9c905966 | 3818 | |
08c95832 FT |
3819 | if (STbuffer->cleared) |
3820 | priority |= __GFP_ZERO; | |
3821 | ||
9c905966 | 3822 | if (STbuffer->frp_segs) { |
c982c368 | 3823 | order = STbuffer->reserved_page_order; |
08c95832 | 3824 | b_size = PAGE_SIZE << order; |
9c905966 FT |
3825 | } else { |
3826 | for (b_size = PAGE_SIZE, order = 0; | |
46081b16 FT |
3827 | order < ST_MAX_ORDER && |
3828 | max_segs * (PAGE_SIZE << order) < new_size; | |
8f78fc5e | 3829 | order++, b_size *= 2) |
9c905966 | 3830 | ; /* empty */ |
373daacf | 3831 | STbuffer->reserved_page_order = order; |
9c905966 | 3832 | } |
8f78fc5e KM |
3833 | if (max_segs * (PAGE_SIZE << order) < new_size) { |
3834 | if (order == ST_MAX_ORDER) | |
3835 | return 0; | |
3836 | normalize_buffer(STbuffer); | |
3837 | return enlarge_buffer(STbuffer, new_size, need_dma); | |
3838 | } | |
1da177e4 LT |
3839 | |
3840 | for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; | |
3841 | segs < max_segs && got < new_size;) { | |
08c95832 FT |
3842 | struct page *page; |
3843 | ||
3844 | page = alloc_pages(priority, order); | |
3845 | if (!page) { | |
1da177e4 LT |
3846 | DEB(STbuffer->buffer_size = got); |
3847 | normalize_buffer(STbuffer); | |
3848 | return 0; | |
3849 | } | |
08c95832 | 3850 | |
1da177e4 LT |
3851 | STbuffer->frp_segs += 1; |
3852 | got += b_size; | |
3853 | STbuffer->buffer_size = got; | |
08c95832 | 3854 | STbuffer->reserved_pages[segs] = page; |
1da177e4 LT |
3855 | segs++; |
3856 | } | |
08c95832 | 3857 | STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); |
1da177e4 LT |
3858 | |
3859 | return 1; | |
3860 | } | |
3861 | ||
3862 | ||
40f6b36c KM |
3863 | /* Make sure that no data from previous user is in the internal buffer */ |
3864 | static void clear_buffer(struct st_buffer * st_bp) | |
3865 | { | |
3866 | int i; | |
3867 | ||
3868 | for (i=0; i < st_bp->frp_segs; i++) | |
08c95832 | 3869 | memset(page_address(st_bp->reserved_pages[i]), 0, |
c982c368 | 3870 | PAGE_SIZE << st_bp->reserved_page_order); |
40f6b36c KM |
3871 | st_bp->cleared = 1; |
3872 | } | |
3873 | ||
3874 | ||
1da177e4 LT |
3875 | /* Release the extra buffer */ |
3876 | static void normalize_buffer(struct st_buffer * STbuffer) | |
3877 | { | |
c982c368 | 3878 | int i, order = STbuffer->reserved_page_order; |
1da177e4 | 3879 | |
1ac63cf5 | 3880 | for (i = 0; i < STbuffer->frp_segs; i++) { |
08c95832 FT |
3881 | __free_pages(STbuffer->reserved_pages[i], order); |
3882 | STbuffer->buffer_size -= (PAGE_SIZE << order); | |
1da177e4 | 3883 | } |
1ac63cf5 | 3884 | STbuffer->frp_segs = 0; |
8b05b773 | 3885 | STbuffer->sg_segs = 0; |
c982c368 | 3886 | STbuffer->reserved_page_order = 0; |
d0e1ae31 | 3887 | STbuffer->map_data.offset = 0; |
1da177e4 LT |
3888 | } |
3889 | ||
3890 | ||
3891 | /* Move data from the user buffer to the tape buffer. Returns zero (success) or | |
3892 | negative error code. */ | |
3893 | static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) | |
3894 | { | |
3895 | int i, cnt, res, offset; | |
c982c368 | 3896 | int length = PAGE_SIZE << st_bp->reserved_page_order; |
1da177e4 LT |
3897 | |
3898 | for (i = 0, offset = st_bp->buffer_bytes; | |
08c95832 FT |
3899 | i < st_bp->frp_segs && offset >= length; i++) |
3900 | offset -= length; | |
1da177e4 LT |
3901 | if (i == st_bp->frp_segs) { /* Should never happen */ |
3902 | printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); | |
3903 | return (-EIO); | |
3904 | } | |
3905 | for (; i < st_bp->frp_segs && do_count > 0; i++) { | |
08c95832 FT |
3906 | struct page *page = st_bp->reserved_pages[i]; |
3907 | cnt = length - offset < do_count ? length - offset : do_count; | |
3908 | res = copy_from_user(page_address(page) + offset, ubp, cnt); | |
1da177e4 LT |
3909 | if (res) |
3910 | return (-EFAULT); | |
3911 | do_count -= cnt; | |
3912 | st_bp->buffer_bytes += cnt; | |
3913 | ubp += cnt; | |
3914 | offset = 0; | |
3915 | } | |
3916 | if (do_count) /* Should never happen */ | |
3917 | return (-EIO); | |
3918 | ||
3919 | return 0; | |
3920 | } | |
3921 | ||
3922 | ||
3923 | /* Move data from the tape buffer to the user buffer. Returns zero (success) or | |
3924 | negative error code. */ | |
3925 | static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) | |
3926 | { | |
3927 | int i, cnt, res, offset; | |
c982c368 | 3928 | int length = PAGE_SIZE << st_bp->reserved_page_order; |
1da177e4 LT |
3929 | |
3930 | for (i = 0, offset = st_bp->read_pointer; | |
08c95832 FT |
3931 | i < st_bp->frp_segs && offset >= length; i++) |
3932 | offset -= length; | |
1da177e4 LT |
3933 | if (i == st_bp->frp_segs) { /* Should never happen */ |
3934 | printk(KERN_WARNING "st: from_buffer offset overflow.\n"); | |
3935 | return (-EIO); | |
3936 | } | |
3937 | for (; i < st_bp->frp_segs && do_count > 0; i++) { | |
08c95832 FT |
3938 | struct page *page = st_bp->reserved_pages[i]; |
3939 | cnt = length - offset < do_count ? length - offset : do_count; | |
3940 | res = copy_to_user(ubp, page_address(page) + offset, cnt); | |
1da177e4 LT |
3941 | if (res) |
3942 | return (-EFAULT); | |
3943 | do_count -= cnt; | |
3944 | st_bp->buffer_bytes -= cnt; | |
3945 | st_bp->read_pointer += cnt; | |
3946 | ubp += cnt; | |
3947 | offset = 0; | |
3948 | } | |
3949 | if (do_count) /* Should never happen */ | |
3950 | return (-EIO); | |
3951 | ||
3952 | return 0; | |
3953 | } | |
3954 | ||
3955 | ||
3956 | /* Move data towards start of buffer */ | |
3957 | static void move_buffer_data(struct st_buffer * st_bp, int offset) | |
3958 | { | |
3959 | int src_seg, dst_seg, src_offset = 0, dst_offset; | |
3960 | int count, total; | |
c982c368 | 3961 | int length = PAGE_SIZE << st_bp->reserved_page_order; |
1da177e4 LT |
3962 | |
3963 | if (offset == 0) | |
3964 | return; | |
3965 | ||
3966 | total=st_bp->buffer_bytes - offset; | |
3967 | for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { | |
3968 | src_offset = offset; | |
08c95832 | 3969 | if (src_offset < length) |
1da177e4 | 3970 | break; |
08c95832 | 3971 | offset -= length; |
1da177e4 LT |
3972 | } |
3973 | ||
3974 | st_bp->buffer_bytes = st_bp->read_pointer = total; | |
3975 | for (dst_seg=dst_offset=0; total > 0; ) { | |
08c95832 FT |
3976 | struct page *dpage = st_bp->reserved_pages[dst_seg]; |
3977 | struct page *spage = st_bp->reserved_pages[src_seg]; | |
3978 | ||
3979 | count = min(length - dst_offset, length - src_offset); | |
3980 | memmove(page_address(dpage) + dst_offset, | |
3981 | page_address(spage) + src_offset, count); | |
1da177e4 | 3982 | src_offset += count; |
08c95832 | 3983 | if (src_offset >= length) { |
1da177e4 LT |
3984 | src_seg++; |
3985 | src_offset = 0; | |
3986 | } | |
3987 | dst_offset += count; | |
08c95832 | 3988 | if (dst_offset >= length) { |
1da177e4 LT |
3989 | dst_seg++; |
3990 | dst_offset = 0; | |
3991 | } | |
3992 | total -= count; | |
3993 | } | |
3994 | } | |
3995 | ||
1da177e4 LT |
3996 | /* Validate the options from command line or module parameters */ |
3997 | static void validate_options(void) | |
3998 | { | |
3999 | if (buffer_kbs > 0) | |
4000 | st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; | |
4001 | if (max_sg_segs >= ST_FIRST_SG) | |
4002 | st_max_sg_segs = max_sg_segs; | |
4003 | } | |
4004 | ||
4005 | #ifndef MODULE | |
4006 | /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. | |
4007 | */ | |
4008 | static int __init st_setup(char *str) | |
4009 | { | |
4010 | int i, len, ints[5]; | |
4011 | char *stp; | |
4012 | ||
4013 | stp = get_options(str, ARRAY_SIZE(ints), ints); | |
4014 | ||
4015 | if (ints[0] > 0) { | |
4016 | for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) | |
4017 | if (parms[i].val) | |
4018 | *parms[i].val = ints[i + 1]; | |
4019 | } else { | |
4020 | while (stp != NULL) { | |
4021 | for (i = 0; i < ARRAY_SIZE(parms); i++) { | |
4022 | len = strlen(parms[i].name); | |
4023 | if (!strncmp(stp, parms[i].name, len) && | |
4024 | (*(stp + len) == ':' || *(stp + len) == '=')) { | |
4025 | if (parms[i].val) | |
4026 | *parms[i].val = | |
4027 | simple_strtoul(stp + len + 1, NULL, 0); | |
4028 | else | |
4029 | printk(KERN_WARNING "st: Obsolete parameter %s\n", | |
4030 | parms[i].name); | |
4031 | break; | |
4032 | } | |
4033 | } | |
6391a113 | 4034 | if (i >= ARRAY_SIZE(parms)) |
1da177e4 LT |
4035 | printk(KERN_WARNING "st: invalid parameter in '%s'\n", |
4036 | stp); | |
4037 | stp = strchr(stp, ','); | |
4038 | if (stp) | |
4039 | stp++; | |
4040 | } | |
4041 | } | |
4042 | ||
4043 | validate_options(); | |
4044 | ||
4045 | return 1; | |
4046 | } | |
4047 | ||
4048 | __setup("st=", st_setup); | |
4049 | ||
4050 | #endif | |
4051 | ||
00977a59 | 4052 | static const struct file_operations st_fops = |
1da177e4 LT |
4053 | { |
4054 | .owner = THIS_MODULE, | |
4055 | .read = st_read, | |
4056 | .write = st_write, | |
fd66c1b4 | 4057 | .unlocked_ioctl = st_ioctl, |
1da177e4 LT |
4058 | #ifdef CONFIG_COMPAT |
4059 | .compat_ioctl = st_compat_ioctl, | |
4060 | #endif | |
4061 | .open = st_open, | |
4062 | .flush = st_flush, | |
4063 | .release = st_release, | |
b4d878e2 | 4064 | .llseek = noop_llseek, |
1da177e4 LT |
4065 | }; |
4066 | ||
26898afd JM |
4067 | static int create_one_cdev(struct scsi_tape *tape, int mode, int rew) |
4068 | { | |
4069 | int i, error; | |
4070 | dev_t cdev_devno; | |
4071 | struct cdev *cdev; | |
4072 | struct device *dev; | |
4073 | struct st_modedef *STm = &(tape->modes[mode]); | |
4074 | char name[10]; | |
4075 | int dev_num = tape->index; | |
4076 | ||
4077 | cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew)); | |
4078 | ||
4079 | cdev = cdev_alloc(); | |
4080 | if (!cdev) { | |
4081 | pr_err("st%d: out of memory. Device not attached.\n", dev_num); | |
4082 | error = -ENOMEM; | |
4083 | goto out; | |
4084 | } | |
4085 | cdev->owner = THIS_MODULE; | |
4086 | cdev->ops = &st_fops; | |
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 | } | |
4095 | STm->cdevs[rew] = cdev; | |
4096 | ||
4097 | i = mode << (4 - ST_NBR_MODE_BITS); | |
4098 | snprintf(name, 10, "%s%s%s", rew ? "n" : "", | |
4099 | tape->disk->disk_name, st_formats[i]); | |
4100 | ||
4101 | dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev, | |
4102 | cdev_devno, &tape->modes[mode], "%s", name); | |
4103 | if (IS_ERR(dev)) { | |
4104 | pr_err("st%d: device_create failed\n", dev_num); | |
4105 | error = PTR_ERR(dev); | |
4106 | goto out_free; | |
4107 | } | |
4108 | ||
4109 | STm->devs[rew] = dev; | |
4110 | ||
4111 | return 0; | |
4112 | out_free: | |
4113 | cdev_del(STm->cdevs[rew]); | |
4114 | STm->cdevs[rew] = NULL; | |
4115 | out: | |
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 | ||
405ae7d3 | 4407 | err = do_create_sysfs_files(); |
13026a6b JG |
4408 | if (err) |
4409 | goto err_scsidrv; | |
4410 | ||
4411 | return 0; | |
4412 | ||
4413 | err_scsidrv: | |
4414 | scsi_unregister_driver(&st_template.gendrv); | |
4415 | err_chrdev: | |
4416 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), | |
4417 | ST_MAX_TAPE_ENTRIES); | |
4418 | err_class: | |
af23782b | 4419 | class_unregister(&st_sysfs_class); |
13026a6b | 4420 | return err; |
1da177e4 LT |
4421 | } |
4422 | ||
4423 | static void __exit exit_st(void) | |
4424 | { | |
405ae7d3 | 4425 | do_remove_sysfs_files(); |
1da177e4 LT |
4426 | scsi_unregister_driver(&st_template.gendrv); |
4427 | unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), | |
4428 | ST_MAX_TAPE_ENTRIES); | |
af23782b | 4429 | class_unregister(&st_sysfs_class); |
1da177e4 LT |
4430 | printk(KERN_INFO "st: Unloaded.\n"); |
4431 | } | |
4432 | ||
4433 | module_init(init_st); | |
4434 | module_exit(exit_st); | |
4435 | ||
4436 | ||
4437 | /* The sysfs driver interface. Read-only at the moment */ | |
4438 | static ssize_t st_try_direct_io_show(struct device_driver *ddp, char *buf) | |
4439 | { | |
4440 | return snprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); | |
4441 | } | |
4442 | static DRIVER_ATTR(try_direct_io, S_IRUGO, st_try_direct_io_show, NULL); | |
4443 | ||
4444 | static ssize_t st_fixed_buffer_size_show(struct device_driver *ddp, char *buf) | |
4445 | { | |
4446 | return snprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); | |
4447 | } | |
4448 | static DRIVER_ATTR(fixed_buffer_size, S_IRUGO, st_fixed_buffer_size_show, NULL); | |
4449 | ||
4450 | static ssize_t st_max_sg_segs_show(struct device_driver *ddp, char *buf) | |
4451 | { | |
4452 | return snprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); | |
4453 | } | |
4454 | static DRIVER_ATTR(max_sg_segs, S_IRUGO, st_max_sg_segs_show, NULL); | |
4455 | ||
4456 | static ssize_t st_version_show(struct device_driver *ddd, char *buf) | |
4457 | { | |
4458 | return snprintf(buf, PAGE_SIZE, "[%s]\n", verstr); | |
4459 | } | |
4460 | static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL); | |
4461 | ||
405ae7d3 | 4462 | static int do_create_sysfs_files(void) |
1da177e4 | 4463 | { |
405ae7d3 | 4464 | struct device_driver *sysfs = &st_template.gendrv; |
13026a6b JG |
4465 | int err; |
4466 | ||
405ae7d3 | 4467 | err = driver_create_file(sysfs, &driver_attr_try_direct_io); |
13026a6b JG |
4468 | if (err) |
4469 | return err; | |
405ae7d3 | 4470 | err = driver_create_file(sysfs, &driver_attr_fixed_buffer_size); |
13026a6b JG |
4471 | if (err) |
4472 | goto err_try_direct_io; | |
405ae7d3 | 4473 | err = driver_create_file(sysfs, &driver_attr_max_sg_segs); |
13026a6b JG |
4474 | if (err) |
4475 | goto err_attr_fixed_buf; | |
405ae7d3 | 4476 | err = driver_create_file(sysfs, &driver_attr_version); |
13026a6b JG |
4477 | if (err) |
4478 | goto err_attr_max_sg; | |
1da177e4 | 4479 | |
13026a6b JG |
4480 | return 0; |
4481 | ||
4482 | err_attr_max_sg: | |
405ae7d3 | 4483 | driver_remove_file(sysfs, &driver_attr_max_sg_segs); |
13026a6b | 4484 | err_attr_fixed_buf: |
405ae7d3 | 4485 | driver_remove_file(sysfs, &driver_attr_fixed_buffer_size); |
13026a6b | 4486 | err_try_direct_io: |
405ae7d3 | 4487 | driver_remove_file(sysfs, &driver_attr_try_direct_io); |
13026a6b | 4488 | return err; |
1da177e4 LT |
4489 | } |
4490 | ||
405ae7d3 | 4491 | static void do_remove_sysfs_files(void) |
1da177e4 | 4492 | { |
405ae7d3 | 4493 | struct device_driver *sysfs = &st_template.gendrv; |
1da177e4 | 4494 | |
405ae7d3 RD |
4495 | driver_remove_file(sysfs, &driver_attr_version); |
4496 | driver_remove_file(sysfs, &driver_attr_max_sg_segs); | |
4497 | driver_remove_file(sysfs, &driver_attr_fixed_buffer_size); | |
4498 | driver_remove_file(sysfs, &driver_attr_try_direct_io); | |
1da177e4 LT |
4499 | } |
4500 | ||
1da177e4 | 4501 | /* The sysfs simple class interface */ |
ee959b00 | 4502 | static ssize_t |
af23782b | 4503 | defined_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 4504 | { |
7d15d6a4 | 4505 | struct st_modedef *STm = dev_get_drvdata(dev); |
1da177e4 LT |
4506 | ssize_t l = 0; |
4507 | ||
4508 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); | |
4509 | return l; | |
4510 | } | |
c69c6be5 | 4511 | static DEVICE_ATTR_RO(defined); |
1da177e4 | 4512 | |
ee959b00 | 4513 | static ssize_t |
af23782b JM |
4514 | default_blksize_show(struct device *dev, struct device_attribute *attr, |
4515 | char *buf) | |
1da177e4 | 4516 | { |
7d15d6a4 | 4517 | struct st_modedef *STm = dev_get_drvdata(dev); |
1da177e4 LT |
4518 | ssize_t l = 0; |
4519 | ||
4520 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); | |
4521 | return l; | |
4522 | } | |
c69c6be5 | 4523 | static DEVICE_ATTR_RO(default_blksize); |
1da177e4 | 4524 | |
ee959b00 | 4525 | static ssize_t |
af23782b JM |
4526 | default_density_show(struct device *dev, struct device_attribute *attr, |
4527 | char *buf) | |
1da177e4 | 4528 | { |
7d15d6a4 | 4529 | struct st_modedef *STm = dev_get_drvdata(dev); |
1da177e4 LT |
4530 | ssize_t l = 0; |
4531 | char *fmt; | |
4532 | ||
4533 | fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; | |
4534 | l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); | |
4535 | return l; | |
4536 | } | |
c69c6be5 | 4537 | static DEVICE_ATTR_RO(default_density); |
1da177e4 | 4538 | |
ee959b00 | 4539 | static ssize_t |
af23782b JM |
4540 | default_compression_show(struct device *dev, struct device_attribute *attr, |
4541 | char *buf) | |
1da177e4 | 4542 | { |
7d15d6a4 | 4543 | struct st_modedef *STm = dev_get_drvdata(dev); |
1da177e4 LT |
4544 | ssize_t l = 0; |
4545 | ||
4546 | l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); | |
4547 | return l; | |
4548 | } | |
c69c6be5 | 4549 | static DEVICE_ATTR_RO(default_compression); |
1da177e4 | 4550 | |
ee959b00 | 4551 | static ssize_t |
af23782b | 4552 | options_show(struct device *dev, struct device_attribute *attr, char *buf) |
b174be02 | 4553 | { |
7d15d6a4 | 4554 | struct st_modedef *STm = dev_get_drvdata(dev); |
6c648d95 JM |
4555 | struct scsi_tape *STp = STm->tape; |
4556 | int options; | |
b174be02 KM |
4557 | ssize_t l = 0; |
4558 | ||
b174be02 KM |
4559 | options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; |
4560 | options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; | |
4561 | options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; | |
4562 | DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); | |
4563 | options |= STp->two_fm ? MT_ST_TWO_FM : 0; | |
4564 | options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; | |
4565 | options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; | |
4566 | options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; | |
4567 | options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; | |
4568 | options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; | |
4569 | options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; | |
4570 | options |= STm->sysv ? MT_ST_SYSV : 0; | |
4571 | options |= STp->immediate ? MT_ST_NOWAIT : 0; | |
c743e44f | 4572 | options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0; |
b174be02 KM |
4573 | options |= STp->sili ? MT_ST_SILI : 0; |
4574 | ||
4575 | l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); | |
4576 | return l; | |
4577 | } | |
c69c6be5 GKH |
4578 | static DEVICE_ATTR_RO(options); |
4579 | ||
05545c92 SS |
4580 | /* Support for tape stats */ |
4581 | ||
4582 | /** | |
4583 | * read_cnt_show - return read count - count of reads made from tape drive | |
4584 | * @dev: struct device | |
4585 | * @attr: attribute structure | |
4586 | * @buf: buffer to return formatted data in | |
4587 | */ | |
4588 | static ssize_t read_cnt_show(struct device *dev, | |
4589 | struct device_attribute *attr, char *buf) | |
4590 | { | |
4591 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4592 | ||
4593 | return sprintf(buf, "%lld", | |
4594 | (long long)atomic64_read(&STm->tape->stats->read_cnt)); | |
4595 | } | |
4596 | static DEVICE_ATTR_RO(read_cnt); | |
4597 | ||
4598 | /** | |
4599 | * read_byte_cnt_show - return read byte count - tape drives | |
4600 | * may use blocks less than 512 bytes this gives the raw byte count of | |
4601 | * of data read from the tape drive. | |
4602 | * @dev: struct device | |
4603 | * @attr: attribute structure | |
4604 | * @buf: buffer to return formatted data in | |
4605 | */ | |
4606 | static ssize_t read_byte_cnt_show(struct device *dev, | |
4607 | struct device_attribute *attr, char *buf) | |
4608 | { | |
4609 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4610 | ||
4611 | return sprintf(buf, "%lld", | |
4612 | (long long)atomic64_read(&STm->tape->stats->read_byte_cnt)); | |
4613 | } | |
4614 | static DEVICE_ATTR_RO(read_byte_cnt); | |
4615 | ||
4616 | /** | |
4617 | * read_us_show - return read us - overall time spent waiting on reads in ns. | |
4618 | * @dev: struct device | |
4619 | * @attr: attribute structure | |
4620 | * @buf: buffer to return formatted data in | |
4621 | */ | |
4622 | static ssize_t read_ns_show(struct device *dev, | |
4623 | struct device_attribute *attr, char *buf) | |
4624 | { | |
4625 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4626 | ||
4627 | return sprintf(buf, "%lld", | |
4628 | (long long)atomic64_read(&STm->tape->stats->tot_read_time)); | |
4629 | } | |
4630 | static DEVICE_ATTR_RO(read_ns); | |
4631 | ||
4632 | /** | |
4633 | * write_cnt_show - write count - number of user calls | |
4634 | * to write(2) that have written data to tape. | |
4635 | * @dev: struct device | |
4636 | * @attr: attribute structure | |
4637 | * @buf: buffer to return formatted data in | |
4638 | */ | |
4639 | static ssize_t write_cnt_show(struct device *dev, | |
4640 | struct device_attribute *attr, char *buf) | |
4641 | { | |
4642 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4643 | ||
4644 | return sprintf(buf, "%lld", | |
4645 | (long long)atomic64_read(&STm->tape->stats->write_cnt)); | |
4646 | } | |
4647 | static DEVICE_ATTR_RO(write_cnt); | |
4648 | ||
4649 | /** | |
4650 | * write_byte_cnt_show - write byte count - raw count of | |
4651 | * bytes written to tape. | |
4652 | * @dev: struct device | |
4653 | * @attr: attribute structure | |
4654 | * @buf: buffer to return formatted data in | |
4655 | */ | |
4656 | static ssize_t write_byte_cnt_show(struct device *dev, | |
4657 | struct device_attribute *attr, char *buf) | |
4658 | { | |
4659 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4660 | ||
4661 | return sprintf(buf, "%lld", | |
4662 | (long long)atomic64_read(&STm->tape->stats->write_byte_cnt)); | |
4663 | } | |
4664 | static DEVICE_ATTR_RO(write_byte_cnt); | |
4665 | ||
4666 | /** | |
4667 | * write_ns_show - write ns - number of nanoseconds waiting on write | |
4668 | * requests to complete. | |
4669 | * @dev: struct device | |
4670 | * @attr: attribute structure | |
4671 | * @buf: buffer to return formatted data in | |
4672 | */ | |
4673 | static ssize_t write_ns_show(struct device *dev, | |
4674 | struct device_attribute *attr, char *buf) | |
4675 | { | |
4676 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4677 | ||
4678 | return sprintf(buf, "%lld", | |
4679 | (long long)atomic64_read(&STm->tape->stats->tot_write_time)); | |
4680 | } | |
4681 | static DEVICE_ATTR_RO(write_ns); | |
4682 | ||
4683 | /** | |
4684 | * in_flight_show - number of I/Os currently in flight - | |
4685 | * in most cases this will be either 0 or 1. It may be higher if someone | |
4686 | * has also issued other SCSI commands such as via an ioctl. | |
4687 | * @dev: struct device | |
4688 | * @attr: attribute structure | |
4689 | * @buf: buffer to return formatted data in | |
4690 | */ | |
4691 | static ssize_t in_flight_show(struct device *dev, | |
4692 | struct device_attribute *attr, char *buf) | |
4693 | { | |
4694 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4695 | ||
4696 | return sprintf(buf, "%lld", | |
4697 | (long long)atomic64_read(&STm->tape->stats->in_flight)); | |
4698 | } | |
4699 | static DEVICE_ATTR_RO(in_flight); | |
4700 | ||
4701 | /** | |
4702 | * io_ns_show - io wait ns - this is the number of ns spent | |
4703 | * waiting on all I/O to complete. This includes tape movement commands | |
4704 | * such as rewinding, seeking to end of file or tape, it also includes | |
4705 | * read and write. To determine the time spent on tape movement | |
4706 | * subtract the read and write ns from this value. | |
4707 | * @dev: struct device | |
4708 | * @attr: attribute structure | |
4709 | * @buf: buffer to return formatted data in | |
4710 | */ | |
4711 | static ssize_t io_ns_show(struct device *dev, | |
4712 | struct device_attribute *attr, char *buf) | |
4713 | { | |
4714 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4715 | ||
4716 | return sprintf(buf, "%lld", | |
4717 | (long long)atomic64_read(&STm->tape->stats->tot_io_time)); | |
4718 | } | |
4719 | static DEVICE_ATTR_RO(io_ns); | |
4720 | ||
4721 | /** | |
4722 | * other_cnt_show - other io count - this is the number of | |
4723 | * I/O requests other than read and write requests. | |
4724 | * Typically these are tape movement requests but will include driver | |
4725 | * tape movement. This includes only requests issued by the st driver. | |
4726 | * @dev: struct device | |
4727 | * @attr: attribute structure | |
4728 | * @buf: buffer to return formatted data in | |
4729 | */ | |
4730 | static ssize_t other_cnt_show(struct device *dev, | |
4731 | struct device_attribute *attr, char *buf) | |
4732 | { | |
4733 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4734 | ||
4735 | return sprintf(buf, "%lld", | |
4736 | (long long)atomic64_read(&STm->tape->stats->other_cnt)); | |
4737 | } | |
4738 | static DEVICE_ATTR_RO(other_cnt); | |
4739 | ||
4740 | /** | |
4741 | * resid_cnt_show - A count of the number of times we get a residual | |
4742 | * count - this should indicate someone issuing reads larger than the | |
4743 | * block size on tape. | |
4744 | * @dev: struct device | |
4745 | * @attr: attribute structure | |
4746 | * @buf: buffer to return formatted data in | |
4747 | */ | |
4748 | static ssize_t resid_cnt_show(struct device *dev, | |
4749 | struct device_attribute *attr, char *buf) | |
4750 | { | |
4751 | struct st_modedef *STm = dev_get_drvdata(dev); | |
4752 | ||
4753 | return sprintf(buf, "%lld", | |
4754 | (long long)atomic64_read(&STm->tape->stats->resid_cnt)); | |
4755 | } | |
4756 | static DEVICE_ATTR_RO(resid_cnt); | |
4757 | ||
c69c6be5 GKH |
4758 | static struct attribute *st_dev_attrs[] = { |
4759 | &dev_attr_defined.attr, | |
4760 | &dev_attr_default_blksize.attr, | |
4761 | &dev_attr_default_density.attr, | |
4762 | &dev_attr_default_compression.attr, | |
4763 | &dev_attr_options.attr, | |
4764 | NULL, | |
af23782b | 4765 | }; |
05545c92 SS |
4766 | |
4767 | static struct attribute *st_stats_attrs[] = { | |
4768 | &dev_attr_read_cnt.attr, | |
4769 | &dev_attr_read_byte_cnt.attr, | |
4770 | &dev_attr_read_ns.attr, | |
4771 | &dev_attr_write_cnt.attr, | |
4772 | &dev_attr_write_byte_cnt.attr, | |
4773 | &dev_attr_write_ns.attr, | |
4774 | &dev_attr_in_flight.attr, | |
4775 | &dev_attr_io_ns.attr, | |
4776 | &dev_attr_other_cnt.attr, | |
4777 | &dev_attr_resid_cnt.attr, | |
4778 | NULL, | |
4779 | }; | |
4780 | ||
4781 | static struct attribute_group stats_group = { | |
4782 | .name = "stats", | |
4783 | .attrs = st_stats_attrs, | |
4784 | }; | |
4785 | ||
4786 | static struct attribute_group st_group = { | |
4787 | .attrs = st_dev_attrs, | |
4788 | }; | |
4789 | ||
4790 | static const struct attribute_group *st_dev_groups[] = { | |
4791 | &st_group, | |
4792 | &stats_group, | |
4793 | NULL, | |
4794 | }; | |
b174be02 | 4795 | |
1da177e4 | 4796 | /* The following functions may be useful for a larger audience. */ |
6620742f FT |
4797 | static int sgl_map_user_pages(struct st_buffer *STbp, |
4798 | const unsigned int max_pages, unsigned long uaddr, | |
4799 | size_t count, int rw) | |
1da177e4 | 4800 | { |
07542b83 JB |
4801 | unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; |
4802 | unsigned long start = uaddr >> PAGE_SHIFT; | |
4803 | const int nr_pages = end - start; | |
1da177e4 | 4804 | int res, i, j; |
1da177e4 | 4805 | struct page **pages; |
6620742f | 4806 | struct rq_map_data *mdata = &STbp->map_data; |
1da177e4 | 4807 | |
1da177e4 LT |
4808 | /* User attempted Overflow! */ |
4809 | if ((uaddr + count) < uaddr) | |
4810 | return -EINVAL; | |
4811 | ||
4812 | /* Too big */ | |
4813 | if (nr_pages > max_pages) | |
4814 | return -ENOMEM; | |
4815 | ||
4816 | /* Hmm? */ | |
4817 | if (count == 0) | |
4818 | return 0; | |
4819 | ||
4820 | if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL) | |
4821 | return -ENOMEM; | |
4822 | ||
4823 | /* Try to fault in all of the necessary pages */ | |
1da177e4 | 4824 | /* rw==READ means read from drive, write into memory area */ |
7e339128 | 4825 | res = get_user_pages_unlocked( |
1da177e4 LT |
4826 | current, |
4827 | current->mm, | |
4828 | uaddr, | |
4829 | nr_pages, | |
4830 | rw == READ, | |
4831 | 0, /* don't force */ | |
7e339128 | 4832 | pages); |
1da177e4 LT |
4833 | |
4834 | /* Errors and no page mapped should return here */ | |
4835 | if (res < nr_pages) | |
4836 | goto out_unmap; | |
4837 | ||
4838 | for (i=0; i < nr_pages; i++) { | |
4839 | /* FIXME: flush superflous for rw==READ, | |
4840 | * probably wrong function for rw==WRITE | |
4841 | */ | |
4842 | flush_dcache_page(pages[i]); | |
4843 | } | |
4844 | ||
6620742f | 4845 | mdata->offset = uaddr & ~PAGE_MASK; |
6620742f | 4846 | STbp->mapped_pages = pages; |
1da177e4 | 4847 | |
1da177e4 | 4848 | return nr_pages; |
1da177e4 LT |
4849 | out_unmap: |
4850 | if (res > 0) { | |
4851 | for (j=0; j < res; j++) | |
4852 | page_cache_release(pages[j]); | |
6bc733e9 | 4853 | res = 0; |
1da177e4 LT |
4854 | } |
4855 | kfree(pages); | |
4856 | return res; | |
4857 | } | |
4858 | ||
4859 | ||
4860 | /* And unmap them... */ | |
6620742f FT |
4861 | static int sgl_unmap_user_pages(struct st_buffer *STbp, |
4862 | const unsigned int nr_pages, int dirtied) | |
1da177e4 LT |
4863 | { |
4864 | int i; | |
4865 | ||
4866 | for (i=0; i < nr_pages; i++) { | |
6620742f | 4867 | struct page *page = STbp->mapped_pages[i]; |
b5810039 | 4868 | |
b5810039 NP |
4869 | if (dirtied) |
4870 | SetPageDirty(page); | |
1da177e4 LT |
4871 | /* FIXME: cache flush missing for rw==READ |
4872 | * FIXME: call the correct reference counting function | |
4873 | */ | |
b5810039 | 4874 | page_cache_release(page); |
1da177e4 | 4875 | } |
6620742f FT |
4876 | kfree(STbp->mapped_pages); |
4877 | STbp->mapped_pages = NULL; | |
1da177e4 LT |
4878 | |
4879 | return 0; | |
4880 | } |